Converter

FIELD: converter and pulse engineering; feeding pulse-power loads.

SUBSTANCE: proposed converter designed to convert dc to pulse energy has power buses 1 with forward diodes 2, 3, regulating transistor 4 with control unit 5 in base circuit, output transformer 6 with two sections 7, 8 of input winding, first and second capacitors 9, 10 connected to starting lead of winding section 7 and to finishing lead of section 8, second leads of capacitors 9 and 10 being connected to emitter and collector of transistor 4, respectively. Novelty is that finishing lead of first section 7 is connected to collector and starting lead of second section 8, to emitter of regulating transistor 4 through cumulative magnetically coupled windings 11, 12 of choke 13, and diodes 2, 3 of power buses are connected to common point of input winding section and choke winding 13 cumulatively with transistor 4. Power buses are shorted out by additional diode 14.

EFFECT: reduced switching losses.

2 cl, 2 dwg

 

The invention relates to a Converter and pulse technique and is intended to supply the consumers pulse power with a high output voltage, and for supplying, for example, magnetic pulse generators.

There are a large variety of converters, but widespread single-ended DC-DC converters (ARF), with one key element and with simplicity of installation and management. A simple single-ended voltage Converter includes an output transformer, the primary winding of which is connected between the power bus and the collector is controlled from a control node of the transistor, emitter which is connected to the shared bus, and the secondary winding is connected to the load,

However, the drawbacks of the simple single-ended Converter are significant dynamic losses in the transistor, reducing efficiency, and low reliability, especially when the high voltage output.

Known solutions to reduce these drawbacks [1, 2]. However, the efficiency of such converters is still low.

The most effective of this type of converters having also one key element chosen for the prototype is the Converter described in [3], which contains the power bus incorporating diodes in the forward direction regulating Tran the STO with the control unit in the base circuit, the first and second capacitors, the first pins connected respectively to the diodes of the first and second power bus, and the second the findings of the first and second capacitors connected respectively to the emitter and collector of the regulating transistor, the output transformer, the input winding of which contains two sections, each of which is connected in a serial chain diode, and the first chain included according to (consistently) between the diode of the first power rail and the collector of the transistor, and the second in series between the emitter and the diode of the second power rail. This Converter has significant reserves of increase of the generated frequency, because of its mode of operation, when the switching transistor, it is disconnected from the power bus, this allows to reduce the constant power bus and accordingly to increase the frequency conversion.

However, this Converter is not fixed switching loss in the transistor associated with the operating mode of the load, especially at high-voltage output, in addition, the narrow scope. A feature of the Converter at high-voltage output is that after the energy transfer to the load is an accumulation of energy in the leakage inductance of the transformer associated with the current (flow) of the magnetization, and this energy is returned to the circuit, with less resistance, or a large shunt effect, i.e. in the primary circuit, and the transistor is already closed and the circuit for current flow no. Transistor voltage occurs, which breaks it.

The main task, which is aimed by the invention is to remedy these disadvantages and the expansion of the scope of this Converter by increasing the reliability of the Converter.

The technical result achieved by the claimed invention is the reduction of switching losses in the transistor when the high voltage output and the elimination of voltage spikes on it.

This technical result is achieved by the fact that in the known Converter comprising a power rail incorporating a diode in the forward direction, the regulating transistor with a control unit in the base circuit, an output transformer, the input winding of which contains two sections, the first and second capacitors, the first pins connected respectively to the beginning of the first section of the winding and by the end of the second winding section, and the second the findings of the first and second capacitors connected respectively to the emitter and collector of the regulating transistor, according to the invention the end of the first section of the input winding of the output transformer is connected to the collector and the beginning of the second CoE is tion to the emitter regulating transistor through according magnitosfernye additional winding entered throttle, and diodes power bus connected respectively to the connection points of the section of the input windings with the windings of the inductor in accordance with the transistor. Moreover, the power bus device is activated an additional diode.

The connecting end of the first section of the input winding of the output transformer to the collector, and the beginning of the second section to the emitter of the regulating transistor through according magnitosfernye winding added inductor, the inductance of which is greater than the critical inductance for the circuit, allows to stabilize the load current in the primary circuit and to ensure their uniform implementation of this in the secondary circuit associated with the complexity of the throttle at a high voltage. This decision is traditional in converting equipment and is widely used. The connection of the diodes of the power rails respectively to the connection points of the section of the input windings with the windings added throttle in accordance with the transistor, and the power bus device is activated an additional diode, allows you to implement a Converter single-ended input to push-pull output with a quasi-permanent load current. The implementation of the two-stroke mode of operation of the Converter, respectively implements positive qualities inherent in push-pull converters, which are known and described in upon Naamah above works. In addition, the presence of capacitors in the circuit current flow when switching eliminates voltage spikes on the transistor, which increases the reliability of the Converter.

Figure 1 shows a diagram of the proposed Converter. The Converter of figure 1, contains the power bus 1 (E+/-) incorporating diodes 2, 3 in the forward direction, the regulating transistor 4 to the control unit 5 (BU) base circuit, an output transformer 6, the input winding of which contains two sections 7 and 8 of the first 9 and second 10 capacitors, the first pins connected respectively to the beginning of the first section 7 of the winding and by the end of the second section 8 of the winding, and the second the findings of the first and second capacitors connected respectively to the emitter and collector of the regulating transistor 4, and the end of the first 7 partition the input winding of the output transformer is connected to the collector and the beginning of the second section to the emitter of the regulating transistor through according magnitosfernye windings 11 and 12 have been added to the inductor 13 and the diodes 2 and 3 power bus connected respectively to the connection points of the section of the input windings with the windings 11, 12 have been added to the inductor 13 in accordance with the transistor 4, and a bus power device is activated an additional diode 14.

The operation of the transducer of figure 1 shows diagrams of the voltages is and one capacitor (a) and current (b) in the winding added throttle 13, control signals of the base of the transistor 4 (C), the voltage at the load (l) of figure 2. The work is illustrated in a stationary mode when the voltage on the capacitors Uc>E and the current in the windings of the inductor Iothers. Upon receipt of the signal from the control unit 5 to the base of transistor 4, the transistor 4 is opened, disconnect the power bus 1, as in the device prototype, and the current coil of the inductor 13 is the discharge of the capacitors 9 and 10 and transfer the energy to the load of one polarity, upon termination of the control pulse to the base of transistor 4, the transistor 4 is closed and the inductor current 13 immediately through the chain of diodes 2, 14, 3 switches to charge the capacitors 9 and 10 and the energy transfer to the load of the other polarity. Under the influence E of the tire 1 power shunt diode 14 is closed and bus 1 power supply connected to the inverter, charging the capacitors 9, 10 and accumulating the current in the windings added throttle 13. The process is repeated. From the above it should and method of power control of the load - change the duty cycle of the control pulses of the base of the transistor, i.e. in the usual way.

The proposed Converter has properties that reduce the voltage spikes on the transistor, which allows you to expand its scope through its application in converters with high output voltage is to be neglected.

Sources of information

1. Romas AM, Drabovich SCI, Yurchenko N.N., Shevchenko PN. High-frequency transistor converters. - M.: Radio and communication, 1988, - 288 S.

2. Bass A.A., Milovzorov VP, Musolin A.K. Sources of secondary power supply with transformer-less entrance. - M.: Radio and communication, 1987, - 160 C., p.34-45.

3. Autospid. SU # 1107227, H 02 M 1/00 // G 05 F 1/56 from 07.01.83. Bull. No. 29.

1. The Converter constant energy pulse containing the power bus incorporating diodes in the forward direction, the regulating transistor with a control unit in the base circuit, an output transformer, the input winding of which contains two sections, the first and second capacitors, the first pins connected respectively to the beginning of the first section of the winding and by the end of the second winding section, and the second the findings of the first and second capacitors connected respectively to the emitter and collector of the regulating transistor, characterized in that the end of the first section of the input winding of the output transformer is connected to the collector and the beginning of the second section to the emitter of the regulating transistor through according magnitosfernye winding added inductor and diodes power bus connected respectively to the connection points of the section of the input windings with the windings of the inductor in accordance with the transistor.

2. The Converter according to claim 1, distinguishing the I, that bus power supply device is activated an additional diode.



 

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