SU1244761A1 - One-step d.c.voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in secondary power sources. The purpose of the invention is to increase the efficiency. The device contains. a power transformer (Tr) 1, a transistor (T) 3, a starting resistor 5, a rectifying diode 7, a capacitor 8. Tr 1 contains the primary winding 2, three control windings (OA) 10, 13, 22 and the secondary winding 6. The device also contains a threshold element 20, 21, an auxiliary transistor (BT) 18, a tunnel diode 19 and a time setting capacitor 15. The introduction of the third control winding 22, the diode 23, the resistor 24, and the connection of the OU 22 to the base BT 18 provides opening T 3 in the absence of current in the power circuit. At the same time in the power circuit through the start. the resistor 5 flows only a current that biases the control transition in the forward direction, which reduces losses. In addition, the exclusion of a pause between the transfer of Tr. 1 energy to the load and the opening of T 3 makes it possible to reduce the current in the power circuit during the open state of T 3 and thereby increase efficiency. 1 il. ; o (L IC 4 4 Od

Description

one

The invention relates to electrical engineering and can be used in secondary power supply systems for converting a constant voltage.

The purpose of the invention is to increase efficiency. The drawing shows a circuit diagram of the proposed single-ended DC / DC converter.

The converter contains a power transformer 1, the primary winding 2 of which through the power transistor 3 is connected to the primary source 4. A start-up resistor 5 connected to the base of the source is connected to the base of the transistor 3, the secondary winding 6 through the rectifier diode 7. connected to the smoothing capacitor 8 and the load 9. The first control winding 10 is connected to the base of the transistor 3 via a diode 11 and the base resistor 12. Second. The control winding 13 is connected to a series-connected time-setting resistor 14 and a capacitor 15 and, via the second diode 16, to a storage capacitor 17 that via auxiliary transistor 18 is connected to the control input of the power transistor 3. The control input of the auxiliary the transistor 18 is shunted by a tunnel diode 19 and through the diode 20 and the resistor is powered with time setting capacitor 15. The third winding 22 controls the sy-, or left transformer 1 through the diode 23 and the resistor 24 is connected to the control input circuit of the auxiliary Yelnia transistor 18.

The Converter operates as follows.

Opening the power transistor 3 with the current of the starting resistor 5 causes current to appear through the primary winding 2 of the power transformer 1. The auxiliary transistor 18 is closed, and the voltage on the first control winding 10 keeps the power transistor 3 in the open state. 15 this time, the accumulation of electromagnetic energy in the transformer 1, and the current through the power transistor increases linearly.

The storage capacitor 17 is charged through the diode 16 to the voltage on the second control winding 13. Simultaneous reload occurs.

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time of condenser 15 with polarity indicated in the drawing without brackets.

An increase in the voltage by the time of the supply capacitor 15 leads to an increase in the current through the tunnel, S 19. When the current through the tunnel diode 19 reaches its peak value, there is a sudden increase in the voltage drop, the auxiliary transistor 18 opens and the negative voltage the storage capacitor 17 is applied to the control junction of the power transistor 3, which results in its fi-latching locking.

After locking the power transistor 3, the polarity of the voltage across the α-windings of the power transformer 1 changes and the energy stored in the transformer is transferred through the rectifying diode 7 to the smoothing capacitor 8 and the load 9. At this time, the driving capacitor 15 is recharged by circuits: winding 13, resistor 14 — capacitor 15. On the third control winding 22, the auxiliary transistor 18 is kept open until all the energy stored in the power transformer 1 is transferred to the load 9 and the voltage at its windings becomes equal nu.lyu "zakrzvaets auxiliary transistor 18, the power transistor is opened by the current flowing through the p-Uskova resistor 5, in the apparatus and processes are repeated.

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Otk: vytie power transistor. The key 13 of the proposed npo-i device proceeds in the absence of a current in the power circuit, therefore only a current flows through the starting resistor, which displaces the control transition in the direct direction: and, which allows to reduce P1 etheri in the starting resistor.

In addition, eliminating the pause between the transfer of energy from the transformer to the load and the opening of the power transistor reduce the current in the power circuit during the open state of the power transistor, thereby increasing efficiency.

Otk: vytie power transistor. The key 13 of the proposed npo-i device proceeds in the absence of a current in the power circuit, therefore only a current flows through the starting resistor, which displaces the control transition in the direct direction: and, which allows to reduce P1 etheri in the starting resistor.

In addition, eliminating the pause between the transfer of energy from the transformer to the load and the opening of the power transistor reduce the current in the power circuit during the open state of the power transistor, thereby increasing efficiency.

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Claims (1)

Invention Single-ended DC / DC converter containing a power transformer, the primary winding — of which one output is connected to the first input terminal of the converter, and the second output through the power transistor to the second input terminal of the converter, W The rich winding is connected via a power diode to the output outputs of the converter, bypassing the filter capacitor, the first control winding is connected to the control input of the power transistor by a single viewer, the control winding is connected to the master RC circuit, to which a capacitor is connected auxiliary key input circuit, connecting Compiler V. Moin Editor N. Shvydka Tehred M. Khodanych Order 3926/57 Circulation 631 Subscription VNIIPI USSR State Committee for inventions and discoveries 11303Ь, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 go force control input. a transistor with a storage capacitor, which through the first diode is also connected to the second control winding, and a starting resistor connected by one output to the first input terminal of the converter, which is due to the fact that, in order to increase efficiency, the first control winding is connected With the control input of the transistor through the first diode and the base resistor connected in series, the starting resistor is connected to the base of the power transistor by another and the third control winding connected to the power transformer Through a series-connected second diode and auxiliary resistor to the control input circuit of the auxiliary switch. Proofreader A.T. sko