SU1737429A2 - Pulsed voltage regulator - Google Patents

Abstract

Usage: in the sources of secondary power supply of electronic equipment. SUMMARY OF THE INVENTION: A series 1 and a parallel 2 regulating transistors on a signal, the control unit 8 is turned on and off synchronously. The base current of the parallel control transistor 2 is determined by the output current of the control unit 8. The base current of the transistor 1 regulating transistor 1 is determined by the inductance of the primary winding 17 of the transformer 16 and has a triangular shape. After locking the control transistors, the energy accumulated in the winding of the throttles 3 is transmitted through the closing diode 4 to the filter capacitor 7. In the same capacitor, the energy accumulated in the transformer 16 is transmitted through the diode 15 when the base current of the control transistor 1 flows in succession. 2 Il.

Description

The invention relates to electrical engineering, can be used mainly for powering general-purpose radio electronic equipment, for example, portable televisions, and is an improvement on the known device according to the main author. Ms 1396132,

A pulsed voltage regulator is known that contains serial and parallel regulating p - n - p - and p - p - n transistors, the first, second and third diodes, the filter capacitor, the control unit, the first and second resistors, and the boosting capacitor . In this case, the emitter of the first (p - n - p) transistor is connected to the input terminal, and its collector is connected through the series output choke and the second diode to the output terminal. The input of the control unit is shunted by a filter capacitor and connected between the output terminal and the common bus to which the anode of the first diode and the emitter of the second (n - p - n) transistor are connected. The cathode of the first diode is connected to the collector of the first transistor, the base of which is connected to the collector of the second transistor through the first and second resistors connected in series with the cathode of the third diode. A forcing capacitor is connected in parallel to the second resistor, the anode of the third diode is connected to the anode of the second diode, and the output of the control unit is connected to the base of the second transistor.

However, in this stabilizer, the flow of the base current of the first transistor is accompanied by the dissipation of energy in the second resistor, which leads to a decrease in efficiency.

The purpose of the invention is to increase efficiency.

The essence of the invention is that a pulse diode and an additional diode and a transformer are introduced. Its primary winding is connected in parallel with the second resistor. The secondary winding of the transformer, connected in series with an additional diode, is connected between the output terminal and the common bus. In this case, the secondary winding of the transformer is switched on opposite to its primary winding.

By introducing an additional diode and a transformer with these connections into the device, energy is transferred from the base of the series regulating transistor to the filter capacitor and to the load. As a result, efficiency increases.

Fig. 1 shows an electrical circuit diagram of the proposed pulse voltage stabilizer; Fig. 2 shows time diagrams of voltages and currents.

The proposed stabilizer (Fig. 1) contains serial 1 and parallel 2 regulating p-rip-p-n-transistors, choke 3, first 4, second 5 and third 6 diodes, filter capacitor 7, control unit 8, first 9 and the second 10 resistors, as well as the forcing capacitor 11. In addition, there are input 12 and output 13 pins, as well as a common

0 tire 14.

An additional diode 15 and a transformer 16c primary 17 and secondary 18 windings are introduced into the device.

In this case, similarly to the known device, the emitter of the p – n – p transistor 1 is connected to the input terminal 12, and its collector is connected through an output terminal 13 in series with the inductor 3 and the diode 5 connected to the output terminal of the control unit 8 and connected between the output pin 13 and a common bus 14, to which the anode of diode 4 and emitter of the n - p - n transistor 2 are connected. The cathode of diode 4 is connected to the collector of transistor 1, the base of which is connected to the collector of transistor 2 and connected to the collector of transistor 2 and cathode di yes 6. Parallel resistor 10, a capacitor 12, the anode of the diode 6 is connected to

0 by the anode of diode 5, and the a-output of control unit 8 is connected to the base of transistor 2.

In contrast to the known device, the primary winding 17 of the inserted transformer 16 is connected in parallel to the second.

5 to resistor 10 (i.e., connected in series with resistor 9 between the base of transistor 1 and collector of transistor 2). A secondary winding 18, connected in series with an additional diode 15, is connected

0 between the output pin 13 and the common bus 14. Winding 17 and 18 are included opposite. The base-emitter transitions of transistors 1 and 2 are shunted by resistors 19 and 20. Control unit 8 is designed for

5 forming rectangular pulses, the duty cycle of which depends on the magnitude of the output voltage.

The proposed stabilizer (figure 1) works as follows.

0 At the time TI receives a positive pulse E with a duration Ta from the output of control unit 8 to the base of transistor 2, it is saturated. Part of the collector current of transistor 2, flowed through

5, resistors 19.9 and 10 provide the saturation of transistor 1 (FIG. 2a). The saturation of the latter occurs by force, which is achieved by shunting resistor 10 and winding 17 with small capacitor 11. The form of voltage EI based on

transistor 1 relative to the emitter is shown in figv. During the duration of the Ts pulse ES, through the saturated transistors 1 and 2, the diode 6 and the choke 3, a current 1h flows (Fig. 2b), energy is accumulated in the inductance of the throttle. Diodes 4 and 5 hours over time are locked. A current H flows through the winding 17 of the transformer 1, more current flows through the high-resistance resistor 10 (fig. 2b). The low-resistance resistor 9 is a current-limiting element. The diode 15 is in this case locked because the windings 17 and 18 are switched in opposite, energy is accumulated in the winding 17. At the moment Tr, when its pulse terminates, transistors 1 vi 2 are locked and under the action of self-induced EMF, diodes 4.5 and 15 are unlocked. connected to pin 13 and to common bus 14. At the same time, currents Is flow through diodes 5 and 15, respectively. 115 (figg, d). The voltage E at the capacitor 7 and at the output of the stabilizer has the form shown in Figure 2e. The locking of the transistor 1, similarly to the known device, occurs forcedly under the action of the sum of the emf self-induction of the choke 3 and the voltage on the capacitor 11 (Fig. 2c).

In a number of cases, the resistor 10 and the capacitor 11 can be excluded. The function of the forcing capacitor in this case can be performed by the parasitic capacitance of the winding 17 of the transformer 16.

The positive effect achieved using the proposed stabilizer is that the energy caused by the flow of the base current of the transistor v 1 during the flat part of the pulse E is stored in the inductance of the winding 17 and then transferred to the capacitor 7 and to the external load. This achieves an increase in efficiency, especially noticeable with an increased supply voltage.

Claims (1)

Claims of Invention Pulse voltage regulator according to aut. St. Ms 1396132, characterized in that, in order to increase efficiency. An additional diode and a transformer are introduced into it, the primary winding of which is connected in parallel; a second resistor, and a secondary winding connected in series with an additional diode, is connected between the output terminal and the common bus, the secondary winding of the transformer being connected in opposite to its primary winding.