SU1415368A1 - D.c. voltage converter - Google Patents

Abstract

The invention relates to the conversion of direct current energy at the input to direct current energy at the output with intermediate conversion to alternating current. The purpose of the invention is to increase efficiency. The converter contains a control unit 5, a power inverter 1, an output transformer 2, an output rectifier 3 and an additional expander 4. The protection node consists of an auxiliary element on the RS flip-flop 7, the overload pulse generator on the logical element 2I — HE 9, the one-oscillator 11 and logical inverter 10 and generator 8 single pulses. The construction of a protection node allows one to exclude a transformer or resistive current sensor in power circuits of the converter and use as a overload sensor a comparison of pulses of a single vibrator 11 and inverted pulses at the output of rectifier 4 and at the inputs of logic element 2И - НЕ 9. 1 лл. cl

Description

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The invention relates to converter equipment and can be used in the development of power supplies with overload protection.

The purpose of the invention is to increase efficiency.

The drawing shows a functional diagram of the device.

The converter contains a power inverter 1, the output transformer 2 whose output winding is connected to a decoder 3 with a filter and an additional winding to an additional rectifier 4 without a filter. The control inputs of the inverter 1 are connected to the outputs of the control unit 5 with a pulse-width modulator, the feedback of which is connected to the output terminal, and the disconnect input 6 is connected to the output of the actuating element to the RS grigger 7, whose S input is connected to the generator has 8 single pulses, and the R input is for the output

During normal operation, the converter pulse and the pulse from the output of the inverter 10 arriving at inputs NAND 9 do not coincide in time due to the delay in switching off the power transistors of the key power amplifier during the dissipation time, as a result a logical signal 1.

In the presence of K.Z. or the overload on the inverter output, the transistors of the latter go out of the state of the nasal and the resorption time of the latter becomes zero or decreases. In this case, the pulses arriving at both inputs of the NAND circuit coincide in time, which leads to the appearance of a logical O on the output of the NAND circuit, which arrives at the R input of the trigger 7, switching the latter.

The signal from the trigger output is fed to the input 6 of the shutdown of the control unit 5 and blocks the passage of a pulse

an overload pulse generator with 25 control terminals to the input of the key amplifying element 2И – НЕ 9, one of the inputs of which through the inverter 10 is connected to the output of the additional rectifier 4, and the other through the one-output power.

To bring the converter to the working state, it is necessary to start the generator of 3 single 1st pulses, the rator 11 with an adjustable length of the pin will return the executive pulses to the output of the pulse-width modulator of the control unit 5.

The DC / DC converter with overload protection operates as follows.

The control unit 5, which includes a latitude no-pulse modulator consisting of a sawtooth generator, error amplifier, comparator, generates a width-modulated signal that is fed to the input of the inverter 1 and the input of a single-oscillator 11 with adjustable pulse duration.

Odnovibrator

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11 produces ka-45

ment trigger to its original state. If the overload is eliminated, the converter works as described.

By adjusting the duration of the calibration pulse, you can adjust the protection threshold.

The invention allows the construction of a DC / DC converter with high-speed current protection and an increase in its HF capacitance level due to the exclusion of a resistive or transformer current sensor in the power circuits of the converter.

Claims (1)

Invention Formula A calibration pulse, the duration of which can be adjusted. The generated pulses are fed to the input of the 2I-NOT 9 circuit. The input of the rectifier 4 is rectangular voltage -45 Invention Formula A constant voltage converter containing an inverter, an output transformer with an auxiliary and an output winding w, which correspond to with a pause at zero, an additional about-50 is connected to the additional inputs of transformer 2, which is rectified and fed to the input of inverter 10, which generates a pulse, the duration of which is determined by the duration of the pause in the output voltage of transformer 2. The pulses from the output of the inverter 10 are fed to the second input circuit 2I-NOT 9. 35 40 45 ment trigger to its original state. If the overload is eliminated, the converter works as described. By adjusting the duration of the calibration pulse, you can adjust the protection threshold. The invention allows the construction of a DC / DC converter with high-speed current protection and an increase in its HF capacitance level due to the exclusion of a resistive or transformer current sensor in the power circuits of the converter. Invention Formula A DC converter containing an inverter, an output transformer with an auxiliary and an output winding w, which are a corresponding and output rectifier with a filter, as well as a control unit with a pulse-width modulator, and the input is disconnected; 1 of the control unit is connected to the output of the actuator node za1dnty RS-flip-flop, S-input is connected to the output of the generator single imgggu. 31А15368 R-input - to the output of the driver it is the first input of the element 2И-НЁ through pulse overload, distinguished-entered inverter connected to the output u and with the fact that, for the purpose of higher-additional rectifier, and the second NIN EFFICIENCY, the said shaper named input through the entered one-shot with pulse overload is logic-adjustable pulse width The 2I-NOT unit is connected to the pulse-width-output output to the R-input of the RS flip-flop, which is equipped with a control of the control panel.