SU1564601A1 - Pulsing dc voltage regulator - Google Patents

Abstract

The invention relates to the secondary power supply sources of electronic equipment. The aim of the invention is to increase reliability. When the transistor 2 is locked, the throttle current initially closes through the serially connected diode 8 and capacitor 9. As the capacitor 9 recharges, the throttle current 11 increases, and by the time the transistor 2 saturates, all the current throttle 4 flows through the serially connected diode 10 and the choke 11. When saturated the transistor 2 at the time of restoring the reverse resistance of the diode 10, the choke 11 prevents the flow of "through" currents, simultaneously in the oscillatory circuit formed by the elements 9, 13, 14, 2, recharge occurs ensatora to a voltage of opposite polarity. After the next turn on of the transistor 2, since the sum of the voltages on the capacitor 9 and the input pins 1 and 12 is close to zero, the transistor is turned off without loss. When this starts, recharging of the capacitor 9 with the current of the drossel, i.e. the energy stored in it is transmitted through output terminals 6.7 to the load. 3 il.

Description

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ABOUT

The invention relates to electrical engineering, in particular, to transistor Converters of constant voltage, and can be used as a source of secondary power supply for radioelectronic equipment.

The purpose of the invention is to increase the standing.

FIG. 1 is a schematic of a down-voltage DC voltage regulator; in fig. 2 is a diagram of a follow-up pulse stabilizer with a Good voltage; in fig. 3 is a diagram of a polar inverting constant voltage regulator.

The DC switching voltage regulator (Fig. 1) contains in series in the first power 1 (first input terminal) a transistor 2, the control transition of which is connected to the control unit 3, a storage choke 4, a filter capacitor 5 connected to the output pins 6 and 7, the first chain of serially connected first discharge diode 3 and capacitor 9, the second chain of serially connected second discharge diode 10 and current limiting droplets 11 connected between the second power bus 12 ( the second input terminal) and the connection point of the transistor 2 with the storage choke 4, the auxiliary diode 13, the anode of which is connected to the connection point of the first discharge diode 8 with the capacitor 9, and the cathode through the recharge choke 14 to the first input output 1.

A switching voltage regulator (Fig. 1) operates as follows.

With a saturated transistor 2, the load connected to the output pins b and 7 receives energy from a source connected to input pins 1 and 12. When the transistor is turned off, the load current first closes along the circuit including the diode 8 and the capacitor 9. At the same time, the current begins to increase in the chain containing the choke 11. Capacitor 9 is selected for a small capacitance, which provides an eiro charge for several microseconds.

The choke 11 is saturated during this period. The saturation time of the choke 11 magnetic circuit is selected based on the recovery time of diode 10. By the time of turning on transistor 2, the load current is guaranteed to flow through diode 10. When turning on the transistor, the turn of the reverse current turns on. the desired value. Simultaneously, the recharging of the capacitor 9 starts through the choke 14 and the diode 13 to a voltage of the opposite polarity, i.e. the capacitor is prepared for the next cycle of operation, which comes from the moment of turning off the transistor 2. When turning off the transistor 2, the capacitor 9 through diode 8 begins to separate. To be pressed by the current droplets 4, which provides an increase in losses in the transistor 2 when it is turned off, and the stored energy of the capacitor 9 is dumped into the load. The discharge of the capacitor 9 is chosen 1.2-1.5 times longer than the turn-off time of transistor 2.

Thus, the proposed technical solution is different in that at the moment of turning on transistor 2, the load current is switched to the second discharge diode 10, in the circuit of which there is a current limiting choke I, i.e. There are no other circuits for the flow of load current in the specified modes of the circuit.

FIG. Figures 2 and 3 show diagrams for explaining, respectively, examples of the use of the proposed technical solution in volumes of boosting and polar-inverting fixed-voltage pulse stabilizers.

Claims (1)

Invention Formula A DC switching voltage regulator, containing a transistor connected in series between the input and output terminals, which controls the junction with the control unit, and a storage choke, a filter capacitor connected between the output terminal and the common bus, the first chain of series-connected first discharge bits. a single diode and a capacitor, a second chain of series-connected second discharge diodes and a current-limiting choke, connected in parallel to each other between a common bus and a junction point of the transistor with a cumulative choke, and an auxiliary diode, one output of which is connected to a common point of the discharge diode and a capacitor of the first chain, characterized in that, in order to increase reliability, a rechargeable choke is added, one output of which is connected to the input output and the second output is connected to the second output of the discharge diode, in which the cathode of the discharge diode is used.