SU1534681A1 - Stabilized converter - Google Patents

Abstract

The invention relates to electrical engineering, in particular to stabilized power sources. The purpose of the invention is to increase efficiency. The device contains a power transformer 3 with an additional switching winding, a power transistor 1, a current transformer 2 switching on and off the windings of which are connected to switching 9 and switching off 7 transistors, as well as diodes 10 and 12. Reducing the dynamic losses on switching off the power transistor 1 by forced shutdown It is provided due to the additional switching winding of the power transformer 3. 1 sludge.

Description

The invention relates to electrical engineering, in particular to stabilized power sources.

: The aim of the invention is to increase efficiency.

The drawing shows a diagram of a stabilized converter.

The proposed stabilized converter consists of a power transistor 1, a current transformer 2 and a power transformer 3, the secondary winding of which is connected through a rectifier 4 and a filter 5 to the output terminals (U _Bblx ). and to the input of the control unit 6, the output of which is connected to the input of the turn-off transistor 7 and the input of the inverter 8. The output of the inverter 8 is connected to the input of the turn-on transistor 9. The collector of the turn-off transistor 7 is connected to the first output of the turn-off winding of the current transformer 2, and the collector of the turn-on transistor 9 through the second diode 10 is connected to the second output of the including winding of the current transformer 2. The first output of the turn-on winding and the second output of the turn-off winding of the current transformer 2 are connected to the beginning of the additional turn-off winding of the power transformer 3 and through the resistor 11 to the auxiliary input terminal 5. The end of the additional (turn-off) winding. ki power transformer 3 through the first diode 12 is connected to a common bus. ''

I

The stabilized converter operates as follows.

When a control pulse appears on the basis of the switching transistor 9, it opens and current flows through the circuit: + E, resistor 11, including the winding of the current transformer 2, second diode 10, including the transistor 9, common bus. On the base winding of the current transformer 2, and accordingly, on the basis of the power transistor 1, a turn-on voltage appears and the power transistor 1 begins to open. Due to the positive feedback provided by the current transformer 2, the power transistor 1 opens like an avalanche and goes into saturation mode, and the current transformer 2 goes into the current transformation mode. Moreover, the magnitude of the currents flowing through the current and base windings of current transformer 2 is proportional to the load current, and the voltages on all windings are proportional to the voltage drop at the open base-emitter junction of the power transistor 1. The voltage on the current winding of the current transformer 2 slightly exceeds the voltage value additional power supply, therefore, the diode 10 is locked and the current through the resistor 11 is stopped,

When a pulse appears at the output of the control unit 6, the turn-off transistor 7 opens, at the same time, the control pulse disappears to the output of the inverter 8 and the turn-on transistor 9 is locked. In this case, the additional turn-off winding of the power transformer 3 is connected through the opening turn-off transistor 7 and the diode 12 to the turn-off winding of the current transformer 2. The polarity of the windings of the power transformer 2 and the current transformer 2 is selected so that a blocking voltage is applied to the base of the power transistor 1, which conditions the reverse current of the base. ^ This current flows until the absorption of minority carriers in the base of the power transistor 1 has ended.

At the end of the resorption process, the power transistor 1 is locked and the voltage polarity is reversed on all windings of the power transformer 3 and the diode 12 is locked. Now, through the open turning-off transistor 7, current flows through the circuit: · 4th, a resistor 11, turning off the winding of the current transformer 2, turning off the transistor 7, a common bus. When this current flows, the magnetization reversal of the core of the current transformer 2 occurs, and a locking voltage is applied to the base of the power transistor and it is reliably closed.

Thus, due to the introduction of an additional turn-off winding of the power transformer, a forced shutdown of the power transistor is provided, which reduces dynamic losses and increases efficiency.

Claims (1)

Claim A stabilized converter comprising a power transistor, the collector of which is connected through a primary winding of a current transformer and a primary winding of a power transformer to a first input terminal, and its emitter to a second input terminal, turning transistors on and off, emitters connected to a first auxiliary input terminal and an anode of the first diode, and the collector of the turn-off transistor is connected to the first output of the turn-off winding of the current transformer, and its second output is connected to the first output of current transformer, and their connection point is connected via a resistor to the second auxiliary input terminal, and the base current of the transformer is connected to the control transition of the power transistor, a second diode, 5 characterized in that, in order to increase the efficiency, an additional turn-off winding of the power transformer is introduced into it, the first output of which is connected to the cathode of the first diode, and the second output is connected to the point of connection of the turn-on and turn-off current transformer windings, the second output of which includes 15 windings the current transformer through the second diode is connected to the collector of the switching transistor.