This invention relates to driving solenoid and motor loads while providing the means for fast turn on and fast turn off. Many applications including automotive fuel injector drivers, Anti-Skid Braking (ABS) solenoid and motor drivers, and other electro-mechanical motion control require the ability to quickly turn on or off a number of devices. The invention utilizes a bridge architecture to drive the loads and to turn on and off individual devices. The invention employs a diode and a switch for each device controlled plus a single master diode and a single master switch. The invention thereby reduces the number of components needed to control N devices to 2*N+2 from prior art half bridge circuit 4*N. Novel techniques and algorithms are used to multiplex the single master switch and control multiple inductive devices. The system provides redundant control and error checking means to preclude single point failure mechanisms.

PWM multiplexed solenoid driver

An alternating current input to direct current output power supply providing a regulated constant voltage or constant current output and incorporating a switching-mode preregulator and a postregulator. Regulation is primarily obtained by means of a bidirectional switching element operated at a relatively low voltage and the alternating current voltage output from the switching element and an associated power transformer is applied to a rectifying voltage multiplier to produce a high voltage output. A series-pass output regulator, is controlled by negative feedback derived from the output circuitry and negative feedback from such regulator controls the switching element.

Switch-mode voltage and current regulator

Input regulated power supplies

An integrated circuit includes a rectifier circuit, at least one low power element, and a power protection element. The rectifier circuit includes two inputs to receive an input power supply and includes two outputs to provide a rectified power supply related to the input power supply. The low-power circuit element is coupled between the two outputs. The power protection element is coupled between the two output terminals. In a first mode of operation, the power protection element presents a high impedance to the two output terminals. In a second mode of operation, the power protection element has a first power protection characteristic. In a third mode of operation, the power protection element has a second power protection characteristic. The power protection element is adapted to shut down the low-power circuit element when in the third mode of operation.

System and method for high voltage protection of powered devices

Regulated power supply with fold-back overload current characteristic and overvoltage protection

Current and voltage regulated power supply

Phase controlled voltage regulating system

Voltage regulator power supply

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Current and voltage regulated power supply

Phase controlled voltage regulating system

Voltage regulator power supply