Abstract: Provided are a control system of an electromagnetic relay and an electromagnetic relay. The control system of an electromagnetic relay includes an electromagnet coil, a first resistor, and a first voltage control element. A first terminal of the electromagnet coil is connected to a first terminal of a first power circuit through the first resistor. A second terminal of the electromagnet coil is connected to a second terminal of the first power circuit. The first voltage control element is connected in parallel to the electromagnet coil. The first voltage control element can control the magnitude of the voltage across the electromagnet coil, so that the force to which armature iron is subjected gradually changes.

Abstract: A laundry appliance includes a blower that selectively delivers process air through an airflow path. A rotating drum defines a portion of the airflow path. The rotating drum is attached to a drive shaft that rotates the rotating drum about a rotational axis. The blower and the drive shaft are operated by a common motor. A heater selectively delivers heat to the airflow path. The heater defines an energizing state when a motor current delivered to the common motor is within a predetermined motor current range that is indicative of the common motor operating. The heater defines an idle state when the motor current is outside of the predetermined motor current range.

Abstract: A delay circuit is disclosed. The delay circuit is coupled to a relay switch that is contained in a power conversion device. When an electronic device having the power conversion device is operated in a sleep mode, the delay circuit applies a time delaying process to a power signal that is transmitted to the relay switch, such that a rising time of each of switch-on pulses contained by the power signal is delayed for a specific time. The specific time is set to be longer than a pulse width of each of power-on pulses contained by a power switching signal of the power conversion device. As such, when the electronic device is operated in the sleep mode, switching actions of the relay switch is properly controlled, thereby making the power conversion device not produce noise. Moreover, the service life of the relay unit is also extended.

Abstract: A programmable solid-state relay includes a base module; a configuration module; a control voltage module having an energy storage device; a controller module having at least two microcontrollers, each having an internal EEPROM memory and at least one digital timer; and at least one switch module including at least one switching circuit having first and second switching contacts. The control voltage module is adapted to receive an applied control voltage and to permit pre-selection of an activation voltage level and a de-activation voltage level.

Abstract: A portable diagnostic apparatus for performing diagnostic testing on a circuit breaker includes a number of sensor devices structured to generate a number of sensed parameter signals relating to operation of the circuit breaker during an operational sequence, a number of auxiliary input connectors structured to receive a number of auxiliary data signals from the circuit breaker, the number of auxiliary data signals relating to and being generated in response to the operation of the circuit breaker during the operational sequence, and control and diagnostic circuitry. The control and diagnostic circuitry is structured to control operation of the portable diagnostic apparatus, receive the number of sensed parameter signals and the number of auxiliary data signals, and generate a time signature based on the number of sensed parameter signals and the number of auxiliary data signals.

Abstract: An audio reproducing apparatus includes a power supply, an amplifier, a speaker, and a controller. The power supply is for supplying a voltage. The amplifier is for receiving the voltage and audio signals, amplifying the audio signals, and outputting amplified audio signals. The speaker is for reproducing sound after receiving the amplified audio signals. The controller is for receiving the voltage and generating a control signal to enable the amplifier. The controller includes a generator and a delay unit. The generator is for receiving the voltage and generating the control signal. The delay unit is for delaying the time of transferring the voltage from the power supply to the generator.

Abstract: In an electromagnet (10) having a magnet coil (13), which has an exciter winding (23) wound from an insulated winding wire (24), having a magnet core (14), having a movable armature (16) opposite the magnet core (14), and having a restoring spring (21) engaging the armature (16), a plurality of meltable stanchions (26) of electrically conductive material that are connected electrically conductively to one another are disposed on the magnet coil (13), for the sake of later calibration of the magnetic force furnished by the completed electromagnet (10). The winding wire (24) is guided around each of the stanchions (26), in selected windings of the exciter winding. To adjust the desired magnetic force, at least two stanchions (26) are melted, so that they form a reliable weld with the winding wire (24), through the wire insulation thereof (FIG. 4).

Abstract: An intake module for a vehicular engine has a casing that is constructed of an air cleaner housing portion and an electronic control unit (ECU) housing portion. The air cleaner housing portion that houses an air cleaner is mounted on the engine. The ECU housing portion that houses an ECU is connected with the air cleaner housing portion. A plurality of reinforcement ribs is formed on an outer periphery of the ECU housing portion.

Abstract: A contact protective circuit for a relay detects a transient in the relay operating coil and turns on a low resistance power MOSFET in shunt relation with the contacts before the contacts close or open whereby arcing or deposition of metal on the contracts is avoided. Timing circuitry is provided for controlling the MOSFET to conduct large direct currents for short periods of time. In one embodiment, a ramp up circuit responds to a voltage level in a control signal to drive the operating coil and power a DC-to -DC converter and a timing circuit. The invention provides for hot side switching as well as cold side switching of a load.

Abstract: A printhead of a resistive ribbon printer has a column of electrodes formed on each of at least two edge surfaces. When the column of electrodes at one edge surface is worn out after being used for printing, the printhead is rotated so that the column of electrodes at the other edge surface is used for printing. Instead of the column of electrodes at each edge surface being the same size, the column of electrodes at one edge surface could be smaller than at the other edge surface so as to have a higher resolution for graphics whereby the position of the printhead is changed each time that higher resolution is desired and then returned to its initial position when alphanumeric printing is to occur. The printhead could have more than two edge surfaces with each having a column of electrodes for printing when at the printing position.

Abstract: A molded case circuit breaker includes a solenoid control circuit for controllably energizing a solenoid to actuate a motor operator to automatically move a handle of the circuit breaker to change the operative condition of the circuit breaker. The control circuit includes a monostable multivibrator that supplies an electrical pulse to the solenoid upon the receipt of a switching initiation signal. The time duration of the electrical pulse is controlled to be sufficiently long to assure proper operation of the solenoid and is determined by a timing circuit coupled to the source of operating voltage for the solenoid. If the operating voltage decreases, the time required to charge the timing circuit increases, increasing the duration of the electrical pulse of the solenoid to assure proper operation under low voltage conditions.

Abstract: The invention relates to a circuit arrangement for actuating exciting coils for electromagnetic switchgear. A transistor is connected in series with the exciting coil, as an electronic switch. Parallel with the series connection are a capacitor and a clock generator, which opens and closes the transistor with a certain frequency. Thereby, upon opening, a defined turn-off delay of the electromagnetic switchgear, and upon switching on, with the use of a timing element which at first deactivates the clock generator, the effect of a d-c saver circuit for electromagnetic switchgear can be achieved.

Abstract: A start circuit arrangement for a microwave oven including a power control relay circuit which is independently responsive to a user actuable momentary start switch and to a programmed electronic controller to facilitate operation in a delay start mode. The relay circuit includes a start latch circuit, a door switch and an arm switch. User actuation of the momentary start switch sets the latch circuit. A signal from the electronic controller resets the latch circuit. The door switch is closed by closure of the oven door. The arm switch is closed by an arm signal from the electronic controller when an actual cooking cycle is to begin. The arm signal is removed upon expiration of the cooking cycle. The arm switch, start latch means and door switch are all operatively coupled to the relay such that the relay only enables energization of the power circuit for the oven when the arm switch and door switch are closed and the start latch is set.

Abstract: A fail-safe electronic time delay circuit for providing a predetermined time delay period having an emitter-follower amplifier connectable to a source of recurrent signals, a voltage doubling rectifier for rectifying the amplified recurrent signals and for charging a capacitor which powers a tickler coil transistor oscillator, a pair of complementary switching transistors which are alternately rendered conductive by the a.c. oscillations of the transistor oscillator, a rectifier having a capacitor which is charged when one of the pair of complementary switching transistors is conductive and which is discharged through a vital relay when the other of the pair of complementary switching transistors is rendered conductive.

Abstract: A resistive controller suitable for sensing a variable electrical resistance indicative of a characteristic of a substance and for connecting an external electrical device to a source of electrical power when the measured electrical resistance reaches a predetermined level. The resistive controller includes a timer circuit which is activated when the measured electrical resistance reaches the predetermined value and which, in one embodiment, provides an adjustable time period, upon the expiration of which, the external electrical device is disconnected from the source of electrical power. In another embodiment, the timer circuit provides an adjustable time period, upon the expiration of which, the external electrical device is connected to the source of electrical power.

Abstract: A lamp control circuit having a heater and thermistor coupled between the illumination sensitive device and the control electrode of an SCR or triac for providing a time delay between the detection of a change in illumination and the switching of the SCR or triac.

Abstract: The invention is concerned with a time delay circuit for timing relays with operation by means of alternating potential with a rectifier, a programmable unijunction transistor and an RC network with a common junction point.

Abstract: The invention relates to a sun lamp provided with a timer circuit that includes a capacitor. As soon as the capacitor reaches a certain charge condition the sun lamp is switched-off.The sun lamp also comprises a safety circuit responsive to a given level of current through the capacitor, which indicates a defect in the timer circuit 2, to rapidly terminate the irradiation.

Abstract: This disclosure relates to a fail-safe timing circuit having a regulator which produces a regulated d.c. voltage when a switch is closed. A signal generator powered by the regulated d.c. voltage for producing square-wave signals. A two-stage amplifier for amplifying the square-wave signals which are fed to a dual rectifier network which produces a positive d.c. voltage and a regulated negative fail-safe d.c. voltage. A pulse generator powered by the positive d.c. voltage for producing signal pulses having an unequal duty cycle. A charging circuit connected to the regulated negative d.c. voltage, and a trigger circuit for periodically sampling the potential charge on the charging circuit. An amplifier for amplifying periodic pulses which are produced during the sampling of the potential charge. A level detector for producing a.c. oscillations when the level of the periodic pulses exceeds a predetermined value, an amplifier for amplifying the a.c. oscillations, and a rectifier for rectifying the amplified a.c.

Abstract: A drive circuit for a solenoid pump comprises a series combination of a pump solenoid and a capacitor connected through a rectifier circuit with an a.c. source. The solenoid is shunted by another rectifier poled to pass a charging current to the capacitor. A thyristor is connected across the series combination, and is triggered into conduction, whereupon it short-circuits the series combination to permit a discharge of the capacitor through the solenoid and to prevent a current flow from the source to the capacitor, thus allowing a uniform control of the energy discharged by the capacitor. A trigger circuit for the thyristor comprises a relaxation oscillator including a programmable unijunction transistor, the conduction of which is controlled inversely to fluctuations in the source voltage.

Abstract: In order to stabilize the open time of an electromagnetic fuel injector against variation of vehicle battery voltage, first and second threshold values of solenoid current for opening and closing of the injector are predetermined experimentally, the duration of the injection control signal being determined from the time the first current threshold is reached. The battery voltage dependent delay between the end of the injection control signal and the reaching of the second current threshold as the solenoid current decays is subtracted from the duration of the injector opening control signal for the subsequent injection cycle.

Abstract: A fail-safe time delay circuit comprising a detection relay for sensing the presence and absence of an input signal, a switching relay for assuming a first and a second condition in accordance with the presence and absence of the input signal, and a programmable unijunction transistor oscillating circuit, a silicon controlled rectifier gating circuit and a d.c. making circuit including a solid-state Colpitts oscillator and half-wave rectifier controlled by the second condition of the switching relay for providing a predetermined time delay period between the disappearance and the reappearance of the input signal prior to permitting the switching relay reassume its first condition.