Abstract:
A DC power supply provides plural output voltages with respect to a common reference potential by splitting a DC input voltage potential. The input voltage is equally split into dual voltages by the embodiment described. A buffer circuit is provided between a voltage divider network and an output circuit stage coupled to the load. The buffer circuit operates to maintain a reference voltage node in the output stage at a potential substantially equal to the potential at the common node of the voltage divider network. The split voltages appear as independent power supplies to the load coupled to the power supply.
Abstract:
A charging/discharging circuit is formed of transistors Q1, Q2; resistors R1-R4; and a capacitor C. The series resistors R1, R2 are connected between the power supply line +Vcc and the circuit ground. The series resistors R3, R4 are connected between the line +Vcc and the circuit ground. The collector of NPN transistor Q1 is connected to +Vcc, the base thereof is connected to the junction between R3 and R4, and the emitter thereof is coupled to the junction between R1 and R2. The collector of PNP transistor Q1 is connected to the circuit ground, the base thereof is connected to the junction between R3 and R4, and the emitter thereof is coupled to the junction between R1 and R2. Capacitor C is connected in parallel to R2. The charged voltage of C is used as a reference potential VR for another linear circuit. Suppose that R1=R2, R3=R4 and +Vcc=10 V. When +Vcc rises from 0 V to 10 V but VR does not reach to 5 V, Q1 is forwardly biased so that C is quickly charged by the emitter current of Q1. When +Vcc falls from 10 V to 0 V but VR does not reach 0 V, Q2 is forwardly biased so that C is quickly discharged by the emitter current of Q2. When VR=5 V (stationary state), Q1 and Q2 are both cut-off, so that only small currents flow through the series circuits of R1, R2 and R3, R4. The time constant of (R1.vertline..vertline.R2).C can be made large so that VR is free from ripples of +Vcc.
Abstract:
A power supply circuit which comprises a first power source terminal for applying a plus voltage and a second power source terminal for applying a minus voltage. A first transistor is inserted between the first power source terminal and a load. A second transistor is inserted between a base of the first transistor and a ground potential and is controlled by the voltages applied to the first and second power source terminals. A capacitor is connected to the second power source and ground potential. A sequence of applying or cutting-off voltages to be applied to the load is predetermined even when a sequence of applying or cutting-off the voltages from said first and second power source terminals becomes erratic.
Abstract:
A current from a power transmission line is smoothed by a filter and then compared with a set value to detect and control the transmission current when the transmission current is in the neighborhood of the setpoint. Whereas, the current is directly detected and controlled to the set value without intervening the filter when the deviation rapidly increases.
Abstract:
A voltage splitter circuit provides a terminal voltage equal to half the voltage impressed across a pair of voltage busses. The voltage at the intermediate terminal may be used to provide two equal, but opposite, voltages between the intermediate terminal and each of the busses. The intermediate terminal is located between the output circuits of two complementary transistors connected across the busses. The transistors are operated by an amplifier driven by a voltage divider. A feedback circuit exists between the intermediate terminal and the input of the amplifier to stabilize the circuit.
Abstract:
A multi-deck circuit arrangement including a first deck circuit having a negative supply terminal and a second deck having a positive supply terminal connected to the negative supply terminal. A single power supply provides a voltage across both the first and second decks. The total power consumption will be less than the prior art of having both deck circuits conventionally regulated. The supply rail connecting the second deck's positive supply terminal to the first deck's negative supply terminal may be regulated. In one embodiment, the rail voltage can be controlled to optimize deck circuit operation for speed and power and to avoid level shifters when interfacing to other circuits.
Abstract:
A power supply system for a charge is provided. The power supply system includes a converter connected in input to a current source and in output to a charge, the converter being able to deliver a direct current to the charge and allow the circulation of the current in a single direction, from the current source to the charge and a circulation bus for an electric current, including a first end and a second end. The power supply system further includes a device for injecting an additional alternating voltage and at the second end of the circulation bus, the injection device being connected to the second end and a device for recovering the additional injected alternating voltage, the recovery device being connected between the first end of the bus and the charge, so as to supply the charge with electrical current.
Abstract:
A power supply circuit capable of providing two regulated voltages based on a D.C. input voltage, including a boost converter and a buck-boost converter, the circuit including a single inductive element common to the boost and buck-boost converters.
Abstract:
A circuit includes a PMOS body bias circuit including a PMOS charge pump for generating a positive supply voltage, a PMOS reference voltage generator for providing a PMOS reference voltage, and a PMOS linear voltage regulator circuit for generating a PMOS body bias voltage upon receiving the positive supply voltage and the PMOS reference voltage. The circuit also includes a NMOS body bias circuit including a NMOS charge pump for generating a negative supply voltage, a NMOS reference voltage generator for providing a NMOS reference voltage, and a NMOS linear voltage regulator circuit for generating a NMOS body bias voltage upon receiving the negative supply voltage and the NMOS reference voltage. The PMOS body bias voltage and the NMOS body bias voltage drive bulk of PMOS and NMOS devices in the integrated circuit.