SU1436218A1 - Device for controlling a push-pull transistor gate - Google Patents

Abstract

The invention relates to converter equipment and can be used: in secondary power sources with a wide range of regulation. The purpose of the invention is to expand the range of regulation. When the fill factor of the control signals decreases, the voltage across the bias capacitor 7 decreases. In this case, the capacitor 5 transfers part of the accumulated energy to the displacement capacitor 7 through the row unit 6. With an increase in the fill factor of the control signals, the voltage on the capacitor 7 increases, which leads to the triggering of the threshold discharge unit 8, as a result partial discharge of capacitor 7, contributing to the restoration of its previous voltage level. T, p., A decrease in the fill factor of the control signals does not lead to a decrease in the voltage on the capacitor 7 and to an increase in the dissipation time of minority carriers in the bases of the power transistors P and 12 and thus to the delay of the power part relative to the control signal. Those. stable operation with short durations of control signals is provided. 3 il. with ((L

Description

00

but

N9

00

The invention relates to converter equipment and can be used in secondary power sources with a wide range of adjustment.

The purpose of the invention is to expand the range of regulation.

Fig. 1 is a schematic diagram of a device for controlling a push-pull transistor switch; in fig. 2 — charge unit; FIG. 3 is a threshold bit block.

The device (FIG. 1) contains a control transformer 1, the extreme terminals of the secondary windings 2 and 3 of which are connected to the inputs of the terminal 4, the output of which is connected to the first output of the storage capacitor 5, in parallel with which the inputs of the charging unit 6 are connected, The second terminal of the capacitor 5 is connected to the first output of the bias capacitor 7, the second output of the cat is connected to the output of the charging unit 6, the threshold discharge unit 8 is connected in parallel with the capacitor 7, the extreme terminals of the windings 2 and 3 are through They are intended for connection to the bases of the power transistors 11 and 12 of the key, for connecting to the emitters of which the second terminal of the capacitor 7 is intended, the first terminal of which is connected to the midpoint of the windings 2 and 3.

Block 6 (Fig. 2) contains a resistor 13, the first electrode of which is connected to the first output of the capacitor 5 and the collector of the transistor 14, the base of which is connected to the second output of the resistor 13 and the cathode of the Zener diode 15, the anode of which is connected to the second output of the capacitor 5, the emitter of the transistor 14 connected to the second output of the capacitor 7.

Block 8 (FIG. 3) contains a diode 16, the cathode of which is connected to the first terminal of the capacitor 7, the anode to the emitter of the transistor 17, the base of which is connected to the first terminals of resistors 18 and 19, the second pin of the resistor 18 is connected to the cathode of diode 16, and the second Vyogod resistor 19 - with the collector of the transistor 17 and the second output of the capacitor 7,

The device works as follows,

When a control signal is received from transformer 1 through the base

0

five

0

five

0

five

0

five

the output resistor 9 and the base of the power transistor 11 begin to flow, the transistor 11 opens. The base current flows through the precharged bias capacitor 7 and charges it. Simultaneously, the rectifier 4 charges the capacitor 5, then the control signal is removed from the secondary windings 2 and 3 of the control transformer 1. In this case, the bias capacitor 7 acts as a source of forced locking of the power transistor 11, the forced lock current passes through the circuit: positive terminal of capacitor 7, junction emitter - base of power transformer P, base resistor 9, winding 2 of control transformer 1, negative terminal of capacitor 7 "Current through emitter junction - base of power transformer nzistora 12 does not take place, because it was closed in the period under review. When the polarity of the control signal is changed, the transistor 12s opens, charging of the capacitor 7 takes place, followed by removal of the control signal and locking of the power transistor 12,

When the fill factor of the control signals decreases, the voltage across the capacitor 7 decreases. In this case, capacitor 5 ,. having a less than capacitor 7 constant time, charging circuit and acting as a storage capacitor, it gives a part of the stored energy to the capacitor 7 through a charge unit 6 "The smaller the fill factor of the control signals, the more energy is transferred from the capacitor 5 through the charging unit 6 to the capacitor 7, which contributes to the restoration of the previous voltage level on the capacitor 7. As the charging unit, a linear stabilizer can be used,

With an increase in the fill factor of the equal signals, the voltage on the capacitor 7 increases, which leads to a decrease in the charge current of the capacitor 7 through the charging unit 6. At a certain voltage on the capacitor {1 capacitor, the charge current is 7 flowing through charge block 6 becomes zero. Further increase of the coefficient. fill control signals with -.

leads to the triggering of the threshold discontinuity unit 8, resulting in a partial discharge of the capacitor 7, which helps to restore the previous voltage level on the capacitor 7. The threshold discharge unit 8 can be implemented on the basis of the comparator.

Thus, the voltage on the capacitor 7 is maintained at a certain level. A decrease in the fill factor of the control signals does not lead to a decrease in the voltage on the capacitor 7 bias and to an increase in the resorption time of minority carriers in the bases of the power transistors, and to a lag in the power part of the two-stroke transistor n-th key relative to the signal on the control transformer . Therefore, the proposed device ensures stable operation of a push-pull transistor switch for short durations of control signals, as a result of which the control range is expanded. Formula of the Invention

A device for controlling a push-pull transistor switch,

five

Q 0 5

The primary control transformer, whose extreme outlets of the secondary windings of which are intended to be connected to the bases of the power transistors of the key, are also connected to the inputs of the rectifier, the middle point of the secondary windings of the control transformer is connected to the first terminal of the capacitor, the offset, the second terminal of which is intended to be connected to the emitters of the power transistors of the key, which are characterized by the fact that, in order to expand the control range, a charging unit, a storage capacitor and a threshold discharge unit are introduced, with The input of the charging unit is connected to the first output of the storage capacitor, controlling the input to the second input of the storage capacitor, the output to the second output of the bias capacitor, the second output of the storage capacitor is connected to the first output of the bias capacitor, the threshold discharge unit is connected parallel to the bias capacitor, and the first output of the storage capacitor is connected to the output of the rectifier.

(Rig.2

W

2

H

W 3

(-)

Th

(-LM

/five

/ 7

/five

/

ten

Pusj

Claims (1)

Claim A device for controlling a push-pull transistor key containing a βθ control transformer, the extreme terminals of the secondary windings of which are designed to connect to the bases of the power transistors of the key, and are also connected to the inputs of the rectifier, the midpoint of the secondary windings of the control transformer is connected to the first output of the capacitor *, bias, the second output of which is designed to connect a key to the emitters of power transistors, characterized in that, in order to expand the regulation range, a charge is introduced a storage unit, a storage capacitor and a threshold discharge unit, wherein the input of the charging unit is connected to the first output of the storage capacitor, the control input to the second output of the storage capacitor, the output to the second output of the bias capacitor, the second output of the storage capacitor is connected to the first output of the bias capacitor, threshold the discharge unit is connected in parallel with the bias capacitor, and the first output of the storage capacitor is connected to the output of the rectifier. Figure 2