Abstract: A drive current and a regenerative current are alternately applied to a motor during a PWM (pulse width modulation) time period. The regenerative current is produced by an electromagnetic induction of an armature and flows in the opposite direction as the drive current. Therefore, a rotating speed of the motor is reduced, so that a speed-reduction following characteristic for the motor is improved. By varying the duty factor, the lengths of time during which the drive current and the regenerative current are flowing can be controlled. Thus, the speed of the motor can be controlled.

Abstract: A method of breaking a motor includes the step of applying a pulse width modulated signal to the winding of the motor. A switching voltage is used to intermittently reverse the poles of the motor for selected time periods. The time periods are separated by pauses the duration of which is dependent upon the breaking force needed to stop the motor.

Abstract: A remote-control vehicle includes a controller that produces a pulse-width modulated (PWM) motor control signal and a forward/reverse motor control signal in response to a transmitted digital signal specifying one of a multiplicity of speed control states, each of which has a direction and a PWM duty cycle associated therewith. A MOSFET switch turns on and off in response to the PWM signal to control the flow of current between a battery and a motor to thereby control the speed of the motor. A relay, coupled between the battery and the motor, switches in response to the forward/reverse signal to change the direction of current flow through the motor to thereby control the direction of the motor.

Abstract: A motor drive circuit 1 is driven by a DC power source 2 connected to power source terminals Tv1, Tv2 and has a first drive transistor Q1 for controlling a drive current supplied to a first terminal Tm1 of a motor from the DC power source 2, a second drive transistor Q2 for supplying current drawn from the first terminal Tm1 of the motor 3 to a ground, a third drive transistor Q3 for controlling a drive current supplied to a second terminal Tm2 of the motor 3 from the DC power source 2, a fourth drive transistor Q4 for drawing current from a second terminal Tm2 of the motor 3, a drive control circuit 4 for controlling the operation of the motor 3 by controlling the drive transistors Q1 through Q4 in response to a first and second control signal supplied to a first and second control terminal Tc1, Tc2, a first control transistor Qc1 having the same polarity as, and connected in parallel to and in the reverse direction of, the second drive transistor Q2 and a second control transistor Qc2 having the same polari

Abstract: First FET power transistors of first power amplifying parts and second FET power transistors of second power amplifying parts form current paths from a DC power source to three-phase windings. Three-phase first amplified current signals varying smoothly in rising and falling slopes are supplied to conduction control terminal sides of the first power amplifying parts. Three-phase second amplified current signals varying smoothly in rising and falling slopes are supplied to conduction control terminal sides of the second power amplifying parts. A switching control part performs simultaneous on-off switching of the conduction control terminal sides of the first power amplifying parts, thereby causing first FET power transistors of the first power amplifying parts to perform high-frequency on-off switching. As a result, three-phase drive currents to the windings vary smoothly, thereby reducing motor vibration.

Abstract: A drive unit for driving an electric motor includes two motor drive circuits disposed in parallel and each consisting of a bridge circuit of switching devices each incorporating a reverse blocking diode, a power switch provided between a power supply and each of the bridge circuits, and a function switch provided between the electric motor and each of the bridge circuits. In case of failure of one bridge circuit, the other bridge circuit is used to replace the failed bridge circuit, thereby continuing controlled operation of the electric motor. While these switches which are associated with one of the bridge circuits are closed, the switches associated with the other bridge circuit are kept open. This arrangement prevents the current from flowing from the power supply into the failed bridge circuit. The failed bridge circuit does not allow the electric motor to act as a generator even when any of the switching devices causes an ON fault.

Abstract: An energization controller for an electric motor maintains a desired chopping frequency without increasing a current amplitude. The energization controller is provided with chopping control device which turns off both first and second switching elements of energization circuits of an H-type circuit together with a coil of the electric motor for a predetermined period of time and then turns on only the second switching element when a value of current flowing through the coil exceeds a reference current value and which turns on both the first and second switching elements when the value of current flowing through the coil falls below the reference current value and the predetermined period of time elapses.

Abstract: A unique electrical control for a defroster has a resistive electrical filament strip and a bi-directional motor having a H-bridge drive. The defroster filament may be simultaneously operated to warm a window or mirror and function as a power or current dissipating resistance to prevent a short circuit within the H-bridge drive.

Abstract: A motor drive system for selectively supplying a drive current to a multiple phase motor having each phase winding divided into a plurality of discrete windings includes a plurality of H-bridge drives to control the polarity and magnitude of the drive current. Each H-bridge drive include a pair of half bridge drives interconnected to the terminals of each of the discrete windings. Each of the half bridges have an upper bridge switching element and a lower bridge switching element for coupling the positive and negative potential, respectively, of a DC power source to each discrete winding. The discrete windings of each phase winding are coupled in series by a plurality relays which are selectively actuated by a controller to interconnect the discrete windings in predetermined groups dependent upon the shaft speed of the motor.

Abstract: A circuit arrangement for controlling the operation of a d.c. motor. The circuit includes a controller having a reference potential input and a control input. The control input is used for controlling the speed of the motor. A plurality of switches allows the circuit arrangement to enable the controller to control the motor when the motor is to operate in one direction. The plurality of switches further causes the controller to be unable to control the motor when the motor is to be operated in a second direction. This arrangement improves speed control accuracy.

Abstract: A vehicle sliding door opening/closing control device comprises a control unit for outputting a standby signal and shifting into a standby mode when for a predetermined time there has been no user-operation input for causing a vehicle sliding door driven by a motor to be open/close-driven and shifting into an operating mode and performing control of the motor when there has been a user-operation input and a switch unit for shorting power input terminals of the motor on the basis of the standby signal. When there has been no user-operation input for causing the sliding door to be open/close-driven for a predetermined time, by shifting into a standby mode the power consumption of the control unit can be kept small and as a result it is possible to suppress the battery power consumption of the control unit. Also, in the standby mode, by shorting the power input terminals of the motor it is possible to keep the motor in a locked state and thereby apply braking to the sliding door.

Abstract: A motor-assisted power steering apparatus includes a DC motor which is fixed to a heat conductive frame, a torque sensor for detecting steering torque and a control circuit for controlling current supplied to the motor. The control circuit includes a first unit disposed in a space defined by the frame and a commutator of the motor and a second unit disposed outside the motor. The first unit includes multiple switching elements connected to the motor, and the second unit includes a microprocessor for setting motor current, a current detecting unit for detecting current supplied to the motor, a current control unit for providing duty ratio signals and a gate driving circuit for driving the switching elements according to the duty ratio signals.

Abstract: A charge pump circuit for charging/pumping charge into/out of a charge pumping capacitor. Charge is pumped from the capacitor to turn on one of a pair of MOSFET transistors formed in an integrated circuit for driving a load. The MOSFET transistors are connected at a node in series with one another. The charging capacitor has one end connected at the node and the other connected through a diode to one side of a power supply which is also applied across both transistors. An input signal turns the MOSFETs on and off in a complementary fashion. Each MOSFET has a gate which is discharged to ground when the MOSFET is turned off. A zener diode prevents the capacitor from pumping excess charge to the gate of the MOSFET to which it is connected. Another zener diode prevents damage resulting from excessive voltage external to the integrated circuit.

Abstract: A motor driving apparatus enabling direct pulse width modulation driving (direct PWM driving) in a sensor-less motor. The motor driving apparatus includes a comparison unit for comparing back-electromotive voltages appearing in respective phases of a multi-motor, a pulse width modulating unit for outputting pulse width modulated signals for rotationally driving the motor based upon a rotational error signal of the motor, a minimum pulse width detection unit for detecting the minimum pulse width position of the pulse width modulated signal from the pulse width modulation means, a sample-holding unit for sample-holding comparison outputs of the comparison means at a timing of detection of the minimum pulse width of the pulse width modulated signal from the minimum pulse width detection unit, and a motor driving unit for rotationally driving the motor based upon each sample-and-hold output from the sample-and hold unit.

Abstract: A circuit for operating a polyphase DC motor, such as the type having a plurality of "Y" connected stator coils, has circuitry for charging the coils at a rate which will reduce EMI and other noise, while maintaining an acceptable charge rate. The gate of a selected high side driving transistor is charged at a relatively high rate during a ramping phase. During the ramping phase, the gates of the selected transistor is charged to a voltage near the voltage needed to form a channel in the transistor for conduction. After the ramping phase, the gates are charged at a lesser rate in order to control the rate of charging of the stator coils to prevent noise.

Abstract: An electric power steering device for directly applying the power of an electric motor as an auxiliary steering power to a steering system to lower a steering force required of the driver, wherein a current detecting element in a motor current detecting unit is connected in series with the motor, and a drive control unit is operable to always drive, by a PWM signal, that side of switching elements of a bridge circuit to which the motor is connected. With this construction, a high-frequency pulse noise generated upon the PWM driving of the the switching element is absorbed by an inductance in the motor and hence a high-frequency pulse noise detected by the current detecting element can be controlled at an extremely small level. Thus, the electric power steering device can prevent generation of abnormal noises from the motor and oscillation or hunting of the steering system and provide stable steering characteristics.

Abstract: A switching element for controlling electric power to be supplied to a motor for generating steering assistance power, and a circuit which outputs a control signal to the switching element according to a driving condition are incorporated in an insulating casing. The insulating casing is attached to a housing of a power steering device. An elastic heat-conducting insulating sheet lies between the switching element and the housing. The switching element is pressed against the housing via the sheet.

Abstract: A motor system having a stationary assembly including a winding and a rotatable assembly in magnetic coupling relation to the stationary assembly. A power supply link having upper and lower rails supplied by a power supply provides power to the motor winding. The power supply link has power switches responsive to a motor control signal for selectively connecting the rails to the winding to energize the winding with a motor current whereby an electromagnetic field is produced for rotating the rotatable assembly. The power switches include a set of upper power switches and a set of lower power switches. Each of the power switches has a conducting state and a nonconducting state. The system includes a disable circuit for selectively generating a disable signal and a control circuit for generating the motor control signal to control the power switches.

Abstract: A control apparatus for an electric power steering system assures stability of the feedback control and control generation of noise from the control circuit when the steering wheel automatically returns to the neutral position by means of the self-aligning torque in order to improve the feeling of the steering operation. In the motor driving circuit connecting four semiconductor elements in the shape of H bridge, the semiconductors of the first arm are driven by the duty ratio D1 while the semiconductors of the second arm are driven by the duty radio D2 defined by the function of the duty ratio D1 (D2 is longer in time than D1).

Abstract: A fractional-power electric motor is provided to generate varying amounts of output torque supplied to a driven member over a wide range of RPM speeds so as to reduce power consumption on a battery-powered source. The electric motor includes a rotor and a stator assembly. The stator assembly is disposed around the rotor and is inductively coupled to the rotor. The stator assembly further includes a plurality of poles, each having a main winding and at least one fractional-power winding. The main winding and associated at least one fractional-power winding on each of the stator poles are wound so that the magnetic fluxes generated therefrom are added. Power switching circuits are provided for independently energizing the main and fractional-power windings on each of the stator poles. A controller is used to control selectively the frequency and duty cycle energization of the power switching circuits to vary the rotational speed of the rotor and the amounts of torque supplied to the driven member.

Abstract: A motor drive unit is provided with a bridge circuit including series connected first and second MOS transistors, series connected third and fourth MOS transistors, a DC motor connected between a junction of the first and second MOS transistors and a junction of the third and fourth MOS transistors, a power supply line connected to the first and third MOS transistors and a ground line connected to the second and fourth MOS transistors. The state of the DC motor is controlled by on/off controlling the MOS transistors of the bridge circuit. The MOS transistors are controlled such that the motor is continuously short-circuited when a power is supplied to the motor drive unit and the motor is not driven.

Abstract: A current regulator is disclosed which utilizes a well known driver chip. The driver chip has an input signal known as a brake signal "BRK" which typically is used to stop a standard DC motor. In this invention, the brake signal "BRK" is used to create a low resistance current path in order to sustain the current of the current regulator which is used in conjunction with a stepper motor.

Abstract: When a processor sets a current instruction value and a rotating direction of a motor, two analog instruction signals of a positive polarity and a negative polarity are obtained after completion of a D/A conversion, the analog instruction signal of the negative polarity is selected by an instruction in the CW direction, and the analog instruction signal of the positive polarity is selected by the instruction in the CCW direction. The analog instruction signal of the polarity selected is added to a motor current detection signal which was negatively fed back by an adding circuit, so that an analog deviation signal is derived. A pulse width modulating circuit section outputs a PWM pulse in the CW direction for the negative polarity of the analog deviation signal and outputs a PWM pulse in the CCW direction for the positive polarity.

Abstract: An arrangement for driving a consumer in a vehicle is suggested. The arrangement has at least two switch elements for influencing the current flow through the consumer. For each switch element, the current flowing through this switch element is monitored and evaluated for detecting a short circuit.

Abstract: An on-car motor driving apparatus is equipped with a motor for moving a moving unit such as a window of a motor car, a motor driving controller which controls the revolution, stop, and rotational direction of the motor, and a current measuring and comparing device which measures the variation in current per unit time of the motor and compares the measured variation in current with a preset value. The on-car motor driving apparatus stops the revolution of the motor and/or reverses the rotational direction of the motor through the motor driving controller. The apparatus is further equipped with a voltage measuring device for measuring motor driving voltage and a voltage-based time setting device which changes the length of the unit time in accordance with the driving voltage value measured by the voltage measuring device. Line voltage is supplied to a differential amplifier only when the line voltage is supplied to the motor.

Abstract: A motor actuator for preventing a motor from drawing excess current for longer than a predetermined time delay period including dynamic brakes for simultaneously braking motor rotation when motor operation is terminated for any reason. Source voltage supplies an input to a voltage regulator which in turn supplies a regulated voltage to the motor. The actuator includes a comparator circuit that has one input connected to motor supplied regulated voltage and a second input connected to the source voltage with the voltage level from source voltage adjusted to a level that is equal to the regulated motor voltage level under normal motor operational loads. When the motor draws excessive current the voltages on the comparator inputs become unequal which causes the comparator to have an output voltage. An RC circuit from the comparator output to ground potential delays the comparator output voltage for a predetermined time.

Abstract: A novel motor belt drive mechanism which rotates a mouse or other toys to amuse, occupy, and entertain pets. The device is battery powered with a switch which can be turned on and off to attract a cat or other pet. The device has a low profile, thereby making it difficult to tip over. The device is battery operated and has no exposed dangerous voltage wires for pets to chew on. The device may be mounted in virtually any plane and in rotation may be allowed to animate other suspended devices for further variation. The rotating toy device may be locally or remotely manually oscillated to cause an erratic changing field of direction and at the same time allowing direct inter-action pet entertainment for elderly, disabled and persons with impaired senses.

Abstract: A circuit for driving a motor used to control the HVAC blend door in an automobile is disclosed. The circuit includes an amplifier circuit, an motor, and a three state driver circuit. The driver circut includes three NPN bipolar transistors and two PNP bipolar transistors configured such that the output of the three state driver circuit is turned off if the input is at a intermediate voltage. The output of the three state driver circuit is at a high voltage if the input is at a low voltage. Conversely, the output of the three state driver circuit is at low voltage when the input is at a high voltage.

Abstract: A fractional-power electric motor is provided to generate varying amounts of output torque supplied to a driven member over a wide range of RPM speeds so as to reduce power consumption on a battery-powered source. The electric motor includes a rotor and a stator assembly. The stator assembly is disposed around the rotor and is inductively coupled to the rotor. The stator assembly further includes a plurality of poles, each having a main winding and at least one fractional-power winding. The main winding and associated at least one fractional-power winding on each of the stator poles are wound so that the magnetic fluxes generated therefrom are added. Power switching circuits are provided for independently energizing the main and fractional-power windings on each of the stator poles. A controller is used to control selectively the frequency and duty cycle energization of the power switching circuits to vary the rotational speed of the rotor and the amounts of torque supplied to the driven member.

Abstract: A driver circuit for an electronically commutated electric motor, in particular stepping motor, having one full bridge circuit (I, II) per motor winding (L1, L2), a current sensor resistor (R), a measured value storage device (C5) and a regulator circuit (OP1-OP5) for regulating, during part of the driver phases, the total current flowing through the driver circuit in such a way that this current matches a total current value flowing outside the regulating phases and stored in the storage circuit (C5), in order to prevent alternating components in the total current fed via the supply voltage lines.

Abstract: A method for sensing motor commutation pulses during motor braking without creating negative voltages, which some junction isolated technologies substantially cannot tolerate. For instance, a commutation pulse sensing circuit containing junction isolated technology may only be able to detect commutation pulses intermittently. An H-bridge motor drive configuration is used to drive and brake a motor. High side clamp diodes are coupled between the motor terminals and a high potential source for high side braking of the motor. As an alternative to high side clamp diodes, any other suitable device may be used, including operating the pair of transistors in the upper portion of the H-bridge in an inverse mode. A commutation pulse sensing circuit is coupled to a terminal of the motor. The use of the high side brake clamp diodes avoids generating negative voltages at the motor terminals.

Abstract: A vector control board for an electric vehicle propulsion system motor controller comprising a microcontroller for generating torque requests, a digital signal processor for receiving the torque requests from the microcontroller and for generating phase voltage signals in accordance with the torque requests, and a digital gate array for receiving the phase voltage signals from the digital signal processor and for generating gate drive signals from the phase voltage signals.

Abstract: An electric power steering circuit device comprising a microcomputer, a bridge circuit for switching, a motor current output by a battery to drive a motor based on an output signal from the microcomputer, wiring patterns for flowing a large current, an insulated printed-circuit board for mounting the microcomputer, and a heat radiating plate for mounting thereon on the semiconductor switching elements. The bridge circuit includes a plurality of semiconductor switching elements, and the wiring patterns comprise metal plates fixed by molding. The heat radiating plate and the insulation printed-circuit board are overlapped through a predetermined space.

Abstract: The invention pertains to a bridge circuit and a drive circuit for it, in particular for driving a brushless DC motor. The bridge circuit exclusively consists of n-channel field-effect transistors. An auxiliary potential generated by at least one potential sliding capacitor is provided for driving these particular field-effect transistors which are connected to the positive supply voltage. The auxiliary potential is already built up before the starting of the motor by means of special switching measures, and said auxiliary potential exists at a defined intensity during extended standstill times of the motor.

Abstract: A system for controlling actuating members in the doors of motor vehicles has at least one electromotive actuating drive and at least one actuating element (switch, button) in the door of the motor vehicle, as well as a control unit located in the vehicle itself. The system employs only a two-wire connection between control unit and actuating drive. The control unit, in addition to an ordinary pole-reversing and evaluation circuit, furthermore contains a source of alternating voltage as well as means for connecting the alternating voltage and a decoder. At least two passive components (resistor, capacitor, coil) of different size are provided to be connected by the actuating element in parallel with the actuating drive into the two-wire connection.

Abstract: A power steering apparatus for use in association with an electric motor, includes a switch circuit driven by a PWM wave signal which switches between one polarity and the other of the voltage developed across a motor-driving current detecting resistance synchronously with the PWM wave signal so as to detect the magnitude and direction of the motor-driving current, thereby controlling a duty cycle of the PWM wave signal in accordance with the detected motor-driving current. Thus, the motor steering touch and feeling is enhanced.

Abstract: A motor vehicle accessory control is capable of reversibly activating a DC motor to operate a vehicle door lock, window, sun roof or similarly operated device through a relay controlled H-switch arrangement. The control is provided with an automatic control circuit in a module having input and output terminals but only a single power terminal, which provides either positive power or ground to the module. The opposite power connections are made from the module through the activating relay coils of the H-switch motor drive circuit. A manual switch may be provided for alternative manual reversible activation of the relays; and the circuit provides priority of manual over automatic operation. Neither the manual switch nor the module circuit is capable of activating both relays simultaneously; therefore, a reliable power connection is always available for the module through at least one of the relay activating coils.

Abstract: The present invention provides a power window control system of a vehicle for raising or lowering windows that is controlled by user operated switches which supply or cut off vehicle battery power to the motor that raises or opens the window. A combination of overcurrent protection circuitry and overheating protection circuitry is used to allow switches to be used that are less expensive than the conventionally used switches which can undesirably arc and, eventually malfunction, as previously described.

Abstract: A motor-driven power steering control system of a motor vehicle for assisting a driver in manipulating a steering wheel by making use of an assist torque generated by a reversible motor which is operatively coupled to a steering mechanism of the motor vehicle includes an electric reversible motor mechanically coupled to a steering system of the motor vehicle through an electromagnetic clutch, a motor drive circuit, an H-bridge switching driver circuit for driving the electric reversible motor in forward or reverse direction under the control of the motor drive circuit, and a clutch control circuit for controlling the electromagnetic clutch.

Abstract: The present invention resides in that two of three drivers are BTL-operated in pair to drive the motor for driving the tray and one of the two drivers and a remaining one driver are BTL-operated in pair to drive the other motors. Therefore, it is possible to construct a driver circuit for driving various drive motors within an optical disk drive device by adding only one driver to a conventional driver circuit and, thus, it becomes possible to make the drive circuit as a single chip IC.

Abstract: A device for the controlled rotation of the cover of a door mirror in a motor vehicle comprises a DC fed electric motor to allow the motorized rotation of the cover and an electronic circuit enabling the electric motor. A plurality of feed tracks and a plurality of sliding contacts thereon selectively cut out or enable the connections to one or more sections of the circuit in correspondence with positions of the mirror cover different from the preset positions.The transmission of the rotational movement from the motor to the cover is ensured by a train of gears in which one or more friction elements are inserted.Elastic means are also foreseen for retaining and positioning the cover in respect to the fixed base, to exert, together with said friction elements, different forces of reaction that oppose the relative movement between the cover and the fixed base of the door mirror.

Abstract: Highway crossing gate control circuit in which a permanent magnet motor is controlled to drive up and drive down the gate arm by utilization of a single motor control relay and controller contacts which sense the position of the gate arm. The motor polarity is reversed through utilization of the motor control relay, which is operated by a single up input signal. Provision is included for dynamic breaking on the arm moving downward after an initial drive down mode.

Abstract: A kelvin current sensing circuit in an integrated control circuit that controls the current flowing through the driving coils of a polyphase DC motor. The invention provides for adjusting the voltage to the lower driver transistors of the control circuit by having the kelvin current sensing occur internally within the chip. A ground compatible differential amplifier circuit is used in one embodiment. Each of the lower transistors are connected to the base of respective PNP transistors, the emitters of which being connected together to control one side of the differential amplifier. A control voltage is applied to the other side of the differential amplifier. The output of a comparator, that is connected to the differential amplifier, is used to control the operation of the lower driver transistors. Therefore all of the sensing is done internally in the semiconductor chip. The voltages are taken at the source of each of the lower transistors.

Abstract: An improved current sensing circuit is provided in, or for use with, a power delivery circuit having a current controlling device of the type which includes auxiliary current sensing terminals. The current sensing circuit is particularly useful in conjunction with a respective current sensing power MOSFET located in the "high side" of a switching circuit, such as an H-bridge switch for a bidirectional load. The current sensing circuit has two branches connected to the current sensing MOSFET and to a reference potential and constructed to provide an output voltage signal representative of the main current through the current sensing MOSFET. The first branch includes at least two transistors and a resistor serially connected between a current sense terminal of the MOSFET and a reference potential. The second branch also includes at least two serially connected transistors connected between a terminal of the MOSFET and the reference potential.

Abstract: A device for driving a rotary solenoid in which the two transistors on one side of an H-bridge circuit that drives the rotary solenoid are not simultaneously rendered conductive in order to prevent the burning. An instruction signal from the CPU is made up of a first instruction signal which instructs the rotation in either the forward direction or the reverse direction and a second instruction signal which instructs either the rotation or the holding. Depending upon the combinations of the first and second instruction signals, the output of the logic circuit renders the first to fourth transistors of the H-bridge circuit conductive or non-conductive.

Abstract: A load controller coupled to a load for generating and changing a load voltage including a polarity and a magnitude of the load voltage applied to the load. The load controller further includes a polarity selector, a processor, and a transistor module, and the load controller may be coupled to an interface including polarity controls and magnitude controls. The controller may further include a voltage converter coupled to a power source to provide operating power to the controller. The polarity selector responds to the polarity controls for generating a polarity signal exclusively at one of at least one output of the polarity selector. The processor includes a magnitude generator and at least one switch, with the magnitude generator responding to the magnitude controls for generating a magnitude signal.

Abstract: A motor driving PWM signal generating circuit (1) includes a read-only memory (ROM) (2) in which there is stored data of a PWM signal corresponding to 0 to 180 degrees of a sine wave. A signal representative of an arbitrary rotary phase is supplied to the generating circuit (1) which generates a PWM output signal having a duty ratio of 50% to 100% corresponding to a sine wave of, for example, 0.degree. to 180.degree. degrees. Also, the generating circuit (1) generated signals representative of 0.degree. to 180.degree. degrees of the rotary phase and 180.degree. to 360.degree. degrees of the rotary phase as DIR output signals. The PWM signal and the DIR output signal from the generating circuit (1) are supplied to an exclusive-OR circuit (3). A signal from the exclusive-OR circuit (3) is supplied to an IN input of an H-type bridge driver circuit (4).

Abstract: System and method for selecting a rotational direction of a permanent magnet DC motor, the system including multiple relays and a control switch electrically interconnected so as to provide an open circuit to the motor when the motor is off. In one embodiment, the system includes first and second relays each including switch contacts and a coil for switching voltage to the motor. The system also includes a third relay including switch contacts and a coil for switching voltage to the motor, a control switch having multiple switch positions for selecting the rotational direction of the motor. The control switch, the motor and the relays are electrically interconnected such that a first control switch position provides a first voltage to the motor, a second control switch position provides a second voltage to the motor, the second voltage being opposite in polarity to the first voltage, and a third control switch position provides the open circuit to the motor.

Abstract: A power window system for a four window vehicle has a console module positioned proximate the front seats of the vehicle, which console module has operating switches for the front windows and a mode selection switch thereon. The rear windows are normally operated by a pair of rear window operating switches disposed proximate the rear windows. When the mode selection switch is in the first position, front operating switches operate the front windows and the rear operating switches operate the rear windows. When the mode selection switch is in the second position, the rear operating switches are disabled and the front operating switches operate only the front windows. When the mode selection switch is in the third position, the front operating switches operate only the rear windows. An array of indicator lights is provided on the module to indicate which switches are active and what function they perform.

Abstract: A multipurpose integrated circuit for driving in a switching mode an externally connected load or loads permits implementation of any appropriate supply scheme of the external load or loads through six output terminals thereof and is therefore useful in a large number of applications. The integrated circuit uses six integrated power switching devices provided with respective recirculation diodes and a single externally connected sensing resistor for generating, by means of a customary PWM control loop, a control signal by which means of a logic circuit configurable by .?.programaming.!. .Iadd.programming .Iaddend.permits the generation of driving signals as a function of the control signal for all six integrated power switches in accordance with a configuration of the driving signals which conforms with the particular scheme of connection of the load or loads selected among the different bridge type and unipolar-motor type schemes which may be selected by programming.