SU1396219A1 - Single-cycle stabilized d.c. voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in secondary radio power sources. 1 electronic equipment The aim of the invention is to increase efficiency by reducing losses in the trigger circuit and in the control transistor. The converter eliminates through-currents when switching the regulator, 1И | 1у-ш. Of its transistor 3 due to reliable disconnection of its start circuit until the full power of transformer 1 to load 8 and the current through rectifier 17 stop, and the losses of the start-up resistor 14 by disconnecting it from the power bus immediately after opening the control transistor 3. 3 3. p. f-ly, 1 slug.

Description

I, M3oi; pun-; ii; L (gpusits to electrical engineering, ji MacTM jCTii to converter equipment, | and whether: h (to be used in secondary; use; power supply equipment for electronic equipment) 1.

Whole inventions are a matter of reducing impulse numbers and increasing efficiency by eliminating through-currents and decreasing: losses in the start-up resistor and in re-; U-1iru1tsem transistor.

The drawing shows a diagram of a one-time stabilized constant-voltage transformer.

The converter contains a transformer 1, the primary winding 2 of which is connected in series with the regulating transistor 3 and the current sensor 4, and the output winding 5 via rectifier 6 - with a storage capacitor 7, terminals D. I load the load 8 and the input of control unit 9, the output of which is connected the base of the switching trapzitor 10 and through the first resistor 11 is connected to the emitter of the regulating transistor 3, the second resistor 12 is connected to the winding 13 of the terminal feedback of the transformer 1 and the base of the regulating transistor 3. The base of the control transistor 3 is also connected via the start resistor 14 and the key stage 15 to the source of the thread, and the third input resistor 16 is connected to the control input of the key stage 15, one rectifier 17, which is connected to the input terminal Note the winding 18 of the transformer 1.

Rectifier 17 can be used both by a bridge circuit and by using two diodes. Trrtiy resistor 16 | can be divided into two (as knocked down | in the drawing), each of which is connected to one of the rectifier diodes in series.

A single-ended stabilized dc voltage generator works: - as follows.

 When the input of the device input is connected to the TOYANN01-O voltage of the regulating base 1 of the transistor 3 through the open key, the boii cascade 15 and the start-up trigger 14 are applied to the opening voltage of it. When ogkryvanpp re1-y. Of the operating transistor 3 cher (the primary winding 2 of the transformer 1 starts to flow increasing current and to the bottom, P111 that the 1st winding 18 of the transformer 1 nnvodgs emf locking on the control input to the key stage 15. - I of the scrolling transistor 3 is stopped .. (Htpovrempo in the winding 13 of the positive feedback of the transformer 1 is on (1 nts EMF supporting the control-puddial transistor 3 in the open state, and the current through it continues to increase, 10 times, until the fall stress

the current sensor 4 does not reach a value sufficient to open the switch- uiero transistor 10. In this case, the base current of the control transistor 3 begins to decrease, it goes out of saturation and is locked. The polarity of the voltage on the windings of the transformer 1 is reversed, and it begins to give up the energy accumulated during the open state of the regulating transistor 3 through its output winding 5, which is connected opposite the primary one, and the rectifier 6 to the load 8, charging simultaneously the storage capacitor 7. In this case, in the additional winding 18 of the transformer 1, the EMF maintains the key stage 15 at its control input in the closed state until all the energy accumulated in the transformer 1 It is given to the load and the current through rectifier 6 ceased.

0 Thus, the key stage 15 closes the starting circuit of the regulating transistor 3 lisch after a complete cessation of the current through the rectifier 6 and the resorption of the carriers in it. Further, the work cycle is repeated. During the open state of the regulating transistor 3, the energy from the source to the load 8 does not flow, because the rectifier 6 is biased in the opposite direction, and the voltage on the load 8 is maintained due to the locking. hay in the storage capacitor 7 energy in the previous cycle. The output voltage is stabilized when the input voltage is changed by changing the duration of the open state of the regulating transistor 3 by applying a control signal to the base of the switching transistor 10 from the output of the control unit 9.

The proposed device, due to the closing of the starting circuit of the regulating transistor, only after the transformer fully energizes the load and stops the current through the rectifying diode, it ensures the complete absence of through currents, as a result of which the efficiency of the converter rises and the impulse noise decreases. In addition, the power losses in the start-up circuit are reduced by turning it off immediately after opening the regulating transistor.

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Claims (4)

Invention Formula 50 I. Single-ended stabilized DC / DC converter containing a transformer, the primary winding of which is included in the collector circuit of the regulating transistor, the emitter 55 of which is connected to a common power supply through a current sensor, the output winding of a transformer is connected via a rectifier for connecting the load and to the input of the control unit, the output of which is connected to the base of the switching transistor and through the first resistor is connected to the emitter of the regulating transistor, the emitter of the switching transistor is connected to the common power bus, and the collector is connected to the base of the regulating transistor and through the second resistor and positive winding feedback the transformer with the emitter of the switching transistor, and the start-up resistor, characterized in that, in order to reduce the impulse noise and increase the efficiency by eliminating through 's currents and reduce losses in the resistor and run in the control transistor, it introduced a key stage, a full wave rectifier, an additional transformer winding and a third resistor, wherein the additional transformer coil is connected to an input full wave 0 A rectifier whose output through the third resistor is connected to the control input of the key stage connected in series with the start-up resistor between the base of the regulating transistor and the positive power supply bus. 2. A transducer according to claim I, characterized in that the full-wave Bbinj-HMn-tel is made according to a bridge circuit. 3. A converter according to claim 1, characterized in that the full-wave rectifier is made on two diodes and the winding of the transformer is 1) expired; - Nena with tap.  4. Converter for PP. 1-3, characterized in that the third resistor is divided into two, each of which is turned on. Cn in series with one of the diodes in njx) are the opposite shoulders of the double-bottom rectifier.