Abstract: A motor system comprises a motor and a driving module. The motor has a plurality coil units not electrically connected to each other. The driving module has a control unit, a driving unit and a circuit board. The control unit is coupled to the driving unit. The driving unit has a plurality of driving circuits. The number of the driving circuits is the same as the number of the coil units. Each of the driving circuits is coupled to a respective one of the coil units so as to form a plurality of independent coil loops. The control unit and the driving unit are mounted on the circuit board.

Abstract: The invention pertains to a synchronous rectification device (10) of the H-bridge type supplying a coil (5) of a phase of a synchronous machine, comprising four switches (21, 31, 22, 32) disposed on the electrical links (11, 12) of this H-bridge and intended to be instructed by an electronic circuit (40), characterized in that each switch comprises at least one transistor (T1) instructed by the electronic circuit (40).

Abstract: A motor driving circuit includes at least one set of switching elements, each set of switching elements being two switching elements connected in series to each other, and a diode connected in parallel with one of the two switching elements connected on a power source side, a terminal of a motor to be driven being connected to a junction point between the two switching elements. A voltage transfer element is provided for transferring, from the junction point between the two switching elements, a voltage of a counter electromotive force generated at the motor, to an input end of the other of the two switching elements connected on a ground side.

Abstract: An electronic system for controlling a fan motor includes a microcontroller and a drive circuit. The microcontroller draws power from a first voltage source and generates control signals for sending drive current to stator coils of a fan motor via the drive circuit. The electronic system further includes a second voltage source to provide the microcontroller with an amount of energy sufficient to operate for a short period of time when the voltage of the first voltage source drops below a predetermined level. The microcontroller is configured to detect when the voltage level of the first voltage source drops below a given level and generates control signals for the drive circuit to discharge energy in the stator coils of the fan motor to quickly stop operation of the fan motor within a short period of time.

Abstract: A method for measuring an on resistance in an H-bridge including first and second transistors connected to a first output terminal, third and fourth transistors connected to a second output terminal, and a measurement switch connected to the first and second output terminals. The first and third transistors are connected to a first power supply terminal. The second and fourth transistors are connected to a second power supply terminal. The method includes supplying the first transistor with measurement current during a first period, measuring a first voltage at the first power supply terminal via the third transistor using the second output terminal during the first period, measuring a second voltage at the first output terminal via the measurement switch using the second output terminal during the first period, and determining the on resistance of the first transistor based on the measurement current, first voltage, and second voltage.

Abstract: Bridge driver circuit with integrated charge pump is disclosed. One embodiment provides a driving circuit section of a charge pump capacitor being formed with power switch components and/or diodes of a bridge circuit section.

Abstract: A motor drive circuit comprises a first power line; a second power line; an H-bridge circuit that includes a first source transistor and a first sink transistor connected serially, a second source transistor and a second sink transistor connected serially, a motor coil connected at a connection point between the first source transistor and the first sink transistor, and first to fourth regenerative diodes disposed respectively on the first and second source transistors and the first and second sink transistors, the H-bridge circuit being connected between the first power line and the ground, the first source transistor and the second sink transistor being switched complementarily to the second source transistor and the first sink transistor; and a voltage constraint circuit connected between the second power line and control electrodes of the first and second source transistors, the voltage constraint circuit constraining increase in the voltage of the control electrodes of the first and second source transis

Abstract: Disclosed is a motor drive control device which uses mechanical switches configured in an H-bridge shape and can protect the mechanical switches from being damaged and minimize a voltage chattering problem occurring upon switching on and off The motor drive control device includes: two relay switching units which are coupled to both sides of a motor and each of which is formed in an H-bridge shape and is connected to an output terminal of a bridge circuit; a switching unit which controls a voltage source applied to the relay switching units; and an inverter controller which first controls any one of the relay switching units and then controls the switching unit so that the motor starts to operate, and first controls the switching unit and then controls the one of the relay switching units so that the motor comes to a halt.

Abstract: Latch control methods and systems are disclosed, including a latch that receives power from a motor associated with an H-bridge circuit. A sensor can be provided for monitoring the latch, wherein the sensor obtains latch feedback data from the latch. A microcontroller controls the latch based on the latch feedback data, by controlling an interaction of the H-bridge circuit and the motor with the latch. Additionally, a microprocessor processes instructions for controlling the interaction of the H-bridge circuit and the motor with the latch. Such instructions can be implemented as Proportional Integral Derivative (PID) control instructions.

Abstract: A system and method is provided for improved monitoring and controlling of mechanically commutated DC motors. The system and method include DC motors, pulse-count driver circuitry for driving the motors, motor position sensing circuitry, and motor control circuitry. The system and method provide for improved motor current waveform sensing that is able to effectively reject false brake pulses, avoid erroneous processing due to fluctuating battery voltage levels, and reduce the sensitivity to variations in motor current signals due to dynamic motor load, manufacturing variation, system aging, temperature, brush bounce, EMI, and other factors. The system and method also include an improved ability to multiplex additional external motor drivers to the motor control circuitry, select between sequential and simultaneous drive modes using an SPI bit, and monitor the system controller for an error condition and simultaneously driver motors in response to the error condition.

Abstract: A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a current waveform of the DC motor, a circuit is provided which supplies a current of a current value Ipwm 45% during motor forward rotation or Ipwm 55% during reverse motor rotation to the motor over the period from when the motor starts braking operation to when it stops.

Abstract: A method for controlling a vehicle power seat motor including the steps of generating at least one control signal using a controller, and adjusting the speed of the motor in response to the at least one control signal such that speed of the motor is maintained to a predetermined curve. Maintaining the speed of the motor to the predetermined curve reduces at least one of mechanical wear, erratic motion, and noise of a respective seat mechanism.

Abstract: A direct current motor drive circuit comprises: a hall element; an H-bridge drive circuit which receives an input of a sinusoidal signal outputted from the hall element and outputs rectangular wave signals corresponding to the sinusoidal signal; a dead time circuit which carries out rectangular wave signal processing for the rectangular signals; and an H-bridge circuit which receives the output signals of the dead time circuit, in that the H-bridge circuit includes a first series circuit in which a second switching element connected to a positive power supply voltage and a first FET connected to the ground are connected in series via a first node, a second series circuit in which a first switching element connected to the positive power supply voltage and a second FET connected to the ground are connected in series via a second node, and a coil of the direct current motor connected to the first node and the second node.

Abstract: A driving circuit for switches of direct current fan motor is disclosed. The driving circuit includes a plurality of switches, a first control circuit, and a second circuit. The switches are driven by a first pulse width modulation signal and a second pulse width modulation signal, and they are electrically connected with the direct current fan motor in a bridge manner. A third pulse width modulation signal is used to drive the first control circuit connected to at least one of the switches driven by the first pulse width modulation signal. A fourth pulse width modulation signal is used to drive the second control circuit connected to at least one of the switches driven by the second pulse width modulation signal. Especially, either the first pulse width modulation signal or the second pulse width modulation signal is selected as the third pulse width modulation signal or the fourth pulse width modulation signal.

Abstract: A control circuit, processor and half-bridge are provided for operating electric motors. The half-bridge includes a first electronic switch lying between a supply voltage and a phase tap, and a second electronic switch lying between the phase tap and ground. The control circuit is adapted to control the first and second electronic switches with one out of only three switching signal pairings. The signal pairings consist of (i) the first switch being on and the second switch being off, (ii) the first switch being off and the second switch being on, and (iii) the first and second switches being off The processor has a signal output port coupled to control the control circuit to select one of the three signal pairings, via one of three possible output signals at the signal output port.

Abstract: A valve opening and closing control device of a type making use of a motor enhances driving performance of the motor and restricts heat generated by constituent elements. A bridge circuit of a motor driving circuit comprises three rows of arms comprising two switching elements connected in series to each other and two diodes connected in parallel to corresponding switching elements. The respective arms are connected in parallel to an electric source, and motor windings are connected to points of interconnection of the switching elements on the respective arms. After putting the respective switching elements of the arms in an ON state to carry an electric current to the windings, a control circuit causes the switching element in an ON state to be put as an electricity introduction stoppage element in an OFF state and causes the switching element of the same arm as that, on which the electricity introduction stoppage element is disposed, to be put in an ON state.

Abstract: A pre-drive circuit for a brushless DC single-phase motor permits a cost reduction and an easy adjustment for the control input voltage of a switching device adjacent to a power source in a wider range, especially in increasing the control input voltage. In a drive circuit having four switching devices making up an H-bridge circuit with a motor coil being sandwiched therebetween, a control voltage exceeding a power supply voltage is required to turn ON the switching devices adjacent to the power source. The pre-drive circuit changes the duty ratio of the control voltage controlling motor speed. A circuit unit for generating pulse signals for controlling the switching devices uses an inexpensive logic circuit.

Abstract: While a power transistor which is positioned in an upper arm with respect to an inductive load and a power transistor which is positioned in a lower arm are both controlled to be OFF by a controller, reverse currents flowing in current mirror circuits which respectively correspond to these power transistors positioned in the upper arm and the lower arm are detected by current detectors. Since the currents which flow in the current mirror circuits are proportional to the currents which flow in the power transistors provided corresponding thereto, it is possible to detect the load current based upon the reverse currents which are detected by the current detectors.

Abstract: An electric system utilizes dynamic impedance changes in windings of an electric motor to measure/monitor mechanical position. The method employs a bridge amplifier to measure voltage at a center node or windings against a voltage derived from a reference network. When a winding of the motor is driven, the winding forms a voltage divider across the center node. Impedance changes in windings occur as rotor poles pass by stator poles. The center node voltage varies with these impedance changes in legs on either side; this variation with respect to the reference network corresponds to measurement of rotational position. These measurements provide position/velocity feedback to a servo controller as long as current runs through a winding. This position sensing also applies to controlling commutation for brushless DC motor. Impedance measurement use normal motor-drive current for excitation without additional sensing signals, extra “sense” windings, or external sensors.

Abstract: A circuit for the speed recovery of a direct current motor includes an output stage, output stage having a first pair of transistors, a second pair of transistors, and means a first circuit configured to detect a current circulating in the motor. The output stage further includes a second circuit configured to, activate the second pair transistors for a determined first time period so as to short-circuit the motor, and, at the end of the first time period, unbalance the output stage so as to force a maximum current to circulate for a determined second time period as a function of a value detected by the first circuit during the first time period, so as to stop the motor.

Abstract: An H-type motor bridge coil driver circuit is implemented with an electronic switch in each leg segment of an H-shaped circuit, this bridge circuit having its side legs each connected between a power supply and ground, with the inductive load of a motor coil being connectable as the cross leg of the H-shaped circuit. An alternate current path, voltage level stabilizing element may be connected across each leg segment electronic switch. A coil excess energy storage element may be connected to the coil nodes of the circuit, through alternate current path elements and utilized to temporarily store the discharging of the excess coil energy normally available because of the lagging nature of the motor coil current. This temporary storage element then may discharge this energy back to the power supply through a passive circuit element, and reverse polarity protection is included for the power supply.

Abstract: A system and method determine the parameters of a field of a DC motor. The method comprises obtaining parameters of the DC motor; and performing an iterative processing loop, the iterative processing loop being performed n times. The iterative processing loop includes regulating field current based on the parameters of the DC motor, and calculating a field resistance from a field voltage and the field current measured during the regulating of the field current; operating in a closed loop mode to determine a first field firing angle and a second field firing angle; operating in an open loop mode to determine a first time constant and a second time constant based on applying the first field firing angle and the second field firing angle; and determining at least one parameter of the field of the DC motor based on the first time constant, the second time constant, and the calculated field resistance.

Abstract: A motorized assembly comprises first and second bridge circuits across which respective drive motors are connected. At least one auxiliary motor or actuator is connected between one arm of the first bridge circuit and one arm of the second bridge circuit and electronic control means are arranged to control the operation the drive motors and the or each auxiliary motor or actuator by operating electronic switches of the bridge circuits and an electronic switch connected in series with the or each auxiliary motor or actuator. Such an arrangement obviates the requirement for independent control circuitry for controlling the operation of the or each auxiliary motor or actuator, resulting in a reduction in the overall cost of the motorized assembly.

Abstract: An H-bridge motor driving circuit has, between a PWM comparator and a control circuit, first and second frequency dividers for frequency-dividing, by 2, an AND gate, OR gate, and first and second and second inverters. During a first period, the first and second MOS transistors are turned on, and the second and third MOS transistors are turned off, caused a current to flow through a motor. During a next second period, the third and fourth MOS transistors are turned on, and the first and second MOS transistors are turned off, causing a regenerative current to flow through the motor. During a next third period, the MOS transistors are turned on and off in the same manner as during the first period, causing a current to flow through the motor. During a final fourth period, the first and second MOS transistors are turned on, and the third and fourth MOS transistors are turned off, caused a regenerative current to flow through the motor.

Abstract: A circuit (41) to provide drive voltages to a voice coil motor (VCM) (50) of a hard disk drive (10) has identical high and low side drivers (42, 44, 46, and 48) connected to the VCM (50). Each driver has an output FET (52) selectively connecting the VCM (50) to a control voltage (58). A Class-AB output pair (54 and 54′) in parallel with the output FETs (52 and 52′) provides continuous and linear Class-AB operation at the output node (60) around the crossover point, while the output FETs (52 and 52′) are kept not conducting. This approach offers extremely low level of crossover harmonic distortion. Each FET of the Class-AB pair (54 and 54′) is connected to a biasing FET (56 and 56′) to provide the desired Class-AB quiescent current. Preferably the output FET (52), quiescent current controlling FET (54), and biasing FET (56) are fully integrated.

Abstract: The method consists in determining the angular positions of the rotor, which are useful for switching the phase currents, by deducing them from the sampled reading of the phase voltages, and in measuring the current of each phase by deriving it from the detection of the voltage that is present across a shunt resistor inserted on the negative power supply conductor of the three-phase star bridge of the driving inverter that generates the set of three phase voltages supplied to the motor.

Abstract: An automatic door control system which uses microcontrollers to control four drive transistors and a drive motor connected in an H-bridge circuit. The microcontrollers use pulse width modulation to control the speed of the drive motor.

Abstract: A brushless dc motor assembly including control electronics for allowing variable speed, user-controlled motor operation. The control electronics are connected to a control board which is mounted directly to the motor bearing bracket. Hall effect devices for providing rotor rotational position information to the electronics are connected directly to the control board and extend therefrom to a position adjacent the rotor. The electronics control current through the stator winding through a MOSFET H-bridge circuit in dependence of feedback signals from the hall effect devices, a user-controlled enable signal, a motor winding current limit signal, and an under voltage signal.

Abstract: An improved motor commutation pulse detection circuit for comparing a filtered motor current signal to a threshold value, where the circuit is responsive to the actual or expected amplitude of the commutation pulses for adjusting the motor current signal or the threshold value so that the compared threshold value is substantially equal in amplitude to minimum amplitude commutation pulses in the compared motor current signal. In one circuit, the threshold value is varied in accordance with the average current flowing through the motor at the time of the commutation event. In another circuit, the threshold is effectively switched between a high value and a low value depending on the mode of operation of the motor. A motor run detection threshold is activated during motor running periods, while a motor brake detection threshold is activated during motor braking.

Abstract: A multi-channel motor winding configuration providing low harmonic distortion and a PWM inverting controller for this type of winding configuration are disclosed. The motor winding configuration includes a plurality of individually insulated conductors wound in a group through the stator slots of a synchronous or induction type alternating current (AC) motor. Depending on the winding configuration, the group of conductors may constitute a portion of or the entire current carried by one phase of a single or polyphase motor. The PWM controller for this type of winding configuration connects each conductor in the group to its own dedicated set of power switching devices in an H-bridge configuration. The H-bridge configuration is powered by a direct current (DC) or rectified AC source.