SU1046878A1 - Power pulse-width regulator with current feedback - Google Patents

Abstract

POWER PULSE-PULSE CONTROLLER WITH CURRENT FEEDBACK, containing two power and two switching transistors, the collectors of which are connected to the load, the current transformer with two power, two basic, connected according to, and one control windings, and the base windings are connected by one connectors with a single transformer connected by one and one control windings. power transistors, a control unit having two switching on outputs, connected by 1C bases of switching on transistors, and one switching off output connected to the input of an alternating current key, connected on Directly control winding of the current transformer, characterized in that, in order to increase efficiency, the emitters of the included transistors and § the base of the power transistors with connected to the other conclusions of the base windings are combined.

Description

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00 The invention relates to a conversion technique and can be used in DC and voltage regulators with a wide range of current and voltage variations. Known power, pulse-width regulator with current feedback, made according to the scheme with current feedback. The disadvantages of this scheme are the limited range of regulation and reduced switching reliability. Also known is a wide-pulse current-feedback pulse modulator with a wide control range of 2. However, the device also does not ensure reliable switching on of power transistors. The closest in technical essence to the present invention is a power pulse-width regulator with a current feedback, containing two power and two including Transistors, the collectors of which are connected to a load, a current transformer with two power, two base transformers included according to ,, and one control winding, with the base windings being connected to the emitters of power transistors by one of the outputs, a control unit having two switching-on outputs connected to the switching-on transistors bases, and one switching output, connected to the input of an AC switch connected in parallel to the control winding of the current transformer Z. Neddatok of a known controller of low efficiency, since a sufficiently large power is spent on the control. The purpose of the invention is to increase the efficiency of the controller. The goal is achieved by the fact that in a power pulse width regulator with a current feedback, there are two power and two switching transistors, the collectors of which are connected to the load, the current transformer with two power, two basic, connected according to, and one. control windings, with the base windings being connected to the emitters of power transistiopoBs by one of the outputs, the control unit having two switching on outputs connected to the bases of switching transistors and one switching off output connected to the input of the terminal In the case of an alternating current connected in parallel with the control winding of the current transformer, the emitter of switching-on transistors / and the base of the power transistors with other terminals connected are combined. The drawing shows an electrical diagram of the controller. A power pulse-width regulator with a current feedback view has two power transistors 1 and 2, the collectors of which are connected to load 3, the current transformer 4 with basic 5 and 6, power 7 and 8, and control 9 windings, with the same polarity power and base windings are connected to the same electrodes of power transistors, two on and off transistors 10 and 11, the collectors of which are connected to load 3, and the emitters to the bases of the corresponding power transistors 1 and 2, block 12 of control with 13 and 14 on and off 15 out The switches are connected to the bases of transistors 10 and 11, and turned off to the input of an AC switch 16, in parallel with which the control winding 9 is turned on. The controller works as follows. When the transistor 10 is turned on by switching on the output 13 of the control unit 12, the collector current of the transistor 10 begins to flow through the winding circuit 5 and 7 and the load 3, since the emitter-to-base transition of the power transistor 1 has greater resistance than the base winding resistance 5. Transformer. 4, the current begins to re-magnetize. Under the action of:., A current appears in the windings of the current transformer. The EMF current flows through the base circuit of transistor 1 and transistor 1 is turned on. The load current goes to the collector circuit of transistor 1 and is maintained in the open state of the winding 5. When a signal is received from the switching off output 15 of the control unit 12 on the KEY. 16, the latter short-circuits the winding 9, which leads to the suppression of the power transistor 1. Further, both power transistors V are closed and the load is de-energized. When a switching-on signal is output from output 14 to transistor 11, power transistor 2 is turned on in the same way. Thus, transistors 1 and 2 are alternately switched, ensuring the load is connected to a power source. The duty cycle of the current pulses in the load is determined by the width of the switching pulses supplied to the key 16 from the output 15 of the control unit 12. With the proposed connection of the switching transistors, the current of the switched-on power transistor flows rto to two windings, base and power, simultaneously. Considering that the number of turns of the base winding is 10-20 times more than. turns in the power winding, switching of the power transistor occurs at a current value of 10-20 times less than in the known device, which leads to an increase in the efficiency of the regulator.

3. 10468784

In order to reduce the consumption of the resistors and the outputs 13 and 14 of the unit; from the control unit, it is possible to turn on the control between the bases of the on and the current transformer 4.

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Claims (1)

POWER WIDTH-PULSE CONTROLLER WITH CURRENT FEEDBACK, containing two power and. two switching transistors, the collectors of which are connected to the load, a current transformer with two power, two base, connected according to, and one control windings, with the base windings connected to the emitters of the power transistors by one output, a control unit having two switching outputs connected ι with bases including transistors, and one switching output connected to an input of an alternating current switch connected in parallel with the control winding of a current transformer, characterized in that, in order to increase the efficiency Itter including transistors and the base of the power transistor connected to other ends of the basic coils are combined. <1 X