SU729572A1 - Pulsed dc voltage stabilizer - Google Patents

Description

The invention relates to electrical radio engineering, namely to power sources, and can be used in power supply systems of automation devices and computer equipment. five

Known pulse stabilizer containing a key regulating element, made in the form of parallel-connected transistors, connected in series with the winding of restrictive throttle 1.

The closest in technical essence and the achieved result to the invention is a switching voltage regulator with co-15 holding restrictive choke, the first end of the primary winding of which is connected to the first end of the secondary winding, the first input terminal and the collector of the first regulating 20 transistor, the second end of the primary winding of the limiting throttles is connected to the co-reflector of the second regulating transistor, the emitter of which is connected to the emitter of the first re-25 of the strolling transistor and from Odom smoothing filter, the output of which podk.gaochen to the output terminals, base regulating both transistors are connected to respective outputs 30

the control unit, the input of which is connected to the output terminals, the second end of the secondary winding of the limiting throttle is pushed through the reverse biased diode to the second input terminal, and the limiting capacitor 2.

A disadvantage of the known stabilizer is the complexity of its circuit.

The purpose of the invention is to reduce the power of dynamic losses for control transistors.

This is achieved by the fact that in a dc voltage regulator containing a limiting choke, the first end of the primary winding which is connected to the first end of the secondary winding, the first input terminal and the collector of the first regulating transistor, the second end of the primary winding of the restrictive throttle is connected to the collector of the second regulating transistor, the emitter of which is connected to the emitter of the first regulating transistor and the input of the smoothing filter, the output of which is connected to the output terminals, The bases of both control transistors are connected to the corresponding outputs of the control unit, the input of which is connected to output clips, the second end of the secondary winding of the limiting throttle is connected via a reverse-biased diode to the second input terminal, and the limiting capacitor is connected in parallel to the input of the smoothing filter.

The drawing shows a schematic electrical diagram of a constant-voltage pulse capacitor.

The pulse stabilizer contains a limiting choke 1, control transistors 2 and 3, a control unit 4, a reverse-mixed diode 5, an inductive-capacitive filter b with a damping diode 7 and an injected capacitor 8.

Pulse stabilizer works as follows.

When an OV voltage occurs in the control block 4, the control signals Uy and Uy are formed by the transistors 2 and 3, respectively.

At time t, the base of transistor 2 receives the unlocking signal Uy, transistor 2 is turned on, almost without loss, due to the presence of droplets, to the primary winding of which a full supply voltage is applied for the entire turn on time.

At time t g, the base of the transistor 2 receives a blocking signal and on the base: of the transistor 3, the unlocking signal Uy. Since the turn-off time of high-frequency silicon transistors, the main part of which is the resorption time, is much longer than their turn-on time, the turning on of transistor 3 at time tj occurs at a voltage across a chain consisting of series-connected droplets 1 and transistor 2 close to the residual - the voltage of the transistor 2, and the switching off of the transistor 2 at a voltage equal to the residual voltage of the transistor 3.

At time tj, -tg, the base of transistor 3 receives a blocking signal. The switching off of the transistor 3 is accompanied by the discharge of the capacitor 8, since until the opening of the diode 7 the equality

C kz Hf

where ip is the discharge current of the capacitor 8; 1kz current through the transistor 3; 1 is the load current accepted by the constant and equal to the throttle current of the filter b.

With an appropriate choice of the value of the capacitor 8, the voltage on it during the turn-off time of the transistor 3 will not have time to noticeably decrease, therefore, the loss to turn off will be small

Further, the process of turning on and off of the transistors 2 and 3 continues as described.

Thus, neither the switching on nor the turning off of the transistors 2 and 3 is not accompanied by the release of high power dynamic losses.

In addition, the limiting choke is excluded from the circuit that interrupts the load current, so its presence does not cause high-frequency overvoltage peaks at the moments when the control transistors 2 and 3 are closed.

Claims (2)

1.Vilenkin A.G. Pulse transistor voltage regulators, 1970, p.38. 2.Sb. Modern tasks of transforming technology, part 4., Kiev, 1975, p.344 (prototype).