SU748718A1 - Stabilized converter - Google Patents

Description

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The invention relates to electrical engineering, radio engineering, and can be used in automatic devices, power sources of vehicles and other installations, which use push-pull transistor converters operating at an increased frequency.

There are known stabilized converters 1,2) and 3, which have a lower efficiency due to losses either in the base resistors of the transistors of the power amplifier, or in additional resistors included in t5 an additional locking winding. combining solutions 3 converter has a low | Arezhnostyu due to the passive hold of the previously closed transistor power amplifier. To avoid this, it is necessary to introduce additional sources, and this, in turn, will reduce the efficiency of the converter.

Closest to the invention to the technical essence is a stabilized converter 3, which contains a master oscillator with an output transformer, one is 30

The alternating ends of some secondary windings of which are connected to the bases of the transistors of the power amplifier, the opposite ends of the additional windings of the transformer, the other ends of which are connected with the corresponding input of the converter, and the last through the resistor and the additional transition of the additional trap are connected to the latter; The transistor, whose control junction is connected to the output of a pulse-modulated pulse modulator, connects the other ends of the secondary windings.

A disadvantage of the known device is that the additional resistors included in the additional winding circuit dissipate the additional power, which reduces the efficiency of the device.

The purpose of the invention is to increase the efficiency of the device.

This is achieved by the fact that a stabilized converter containing generator orders with an output transformer, the same ends of one secondary windings of which are connected to the bases of the transistors of the power amplifier, and the opposite ends of the additional windings of the transformer are connected to the latter, the other ends of which are connected with the corresponding input terminal konseipTopa, and with the latter through a resistor and the power transition of the additional transistor, the control transition of which is connected to the output width of the pulse-impulse meat modulator coupled other ends of the secondary windings, an auxiliary transistor is provided ydisednym mostsm to one diagonal

The other ends of the secondary windings are connected through the resistor to the additional transistor power transition, while the other ends of the additional windings are connected to the input terminal through the auxiliary transistor's control transition, which is connected to the output of the pulse-width modulator.

The drawing shows a schematic diagram of the converter.

The device contains a master oscillator I, control windings 2 and 3, transistors 4 and 5 of the power amplifier, diode bridge 6 of diodes 7-10, transistors 11 and 12, current limiting resistor 13, diodes 14 and 15, synchronization winding 16 with a pulse-width modulator -17, straightener with filter 18, load 19, additional locking windings 20 and 21, power supply 22,

The power amplifier transistors 4 and 5 drive the oscillator.

1 through the control windings 2 and 3 and the pulse-width modulator through the transistor switches 11 and 12.

The fill factor of the pulse-width modulator 17 varies depending on the variation of the high-voltage, on the load 19, h; the height is determined by the generator generated 1 through the synchronization winding 16.

The converter works as follows.

Voltage on control windings

2 and 3 are supplied to the anti-phase power amplifier. .

For example, for the time interval of the polarity of the voltage on the windings, control 2 and 3, yak shows

in the drawing, the signal from the pulse-pulse-modulator 17, which unlocks tvansistor 11 (transistor 12 is locked), provides the basic flow of transistor 4 through the circuit: plus control winding 2, ba-emitter junction 4, current-limiting resistor 13, an open diode 10, minus the control winding 2, and the control winding 3 ensures the closed state of the transistor 5, as well as the control winding 3 through the open dy & d is attached to the emitter of the transistor 5 and a minus to its base. At the moment when

From the pulse-width modulator 17, a signal arrives, closing the transistor 11 and opening transistor 12, transistor 4 is closed, because the voltage of the lock-up winding 21 is applied minus through the open diode to the base of transistor 4, and to the emitter of transistor 4 by plus ,

Since the transistor 11 is driven, power dissipation on the current-limiting resistor 13 does not occur.

When the polarity of the voltages on the control windings 2 and 3 and on the locking windings 20 and 21 is changed, the transistor 5 operates similarly to the transistor 4 in the closed-open state of the transistors 11 and 12.

The voltages of the windings 2, 3, 20, 21 must be chosen less than the permissible reverse voltage of the base-emitter transistors 4 and 5, taking into account the voltage drop at the junctions of the diodes b and diodes 14 and 15.

Claims (3)

1. Author's certificate of the USSR 503342, cl. H 02 M 3/335, 1974, 2. USSR author's certificate No. 491941, cl. G 05 F 1/64, 1973. 3. USSR author's certificate number 251021, cl. H 02 M 3/335, 19.68. Sch t CWT "I'm in {""