SU1693701A1 - Ac-to-dc voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and is intended for use as a source of secondary power for a pulsed load. The purpose of the invention is to increase efficiency. In the converter, when the input voltage is positive, the energy goes to the capacitor 7 by switching MIS-1 transistors 4 with the n-channel, and if negative, by switching the MIS transistors 5 from the p-channel BM. Due to the elimination of the rectifier and filter at the input of the converter and the use of parallel connection of MOS transistors, losses are reduced, which leads to an increase in efficiency. 1 il.

Description

The invention relates to electrical engineering and is intended for use as a source of secondary power supply with a capacitive storage device for a pulsed load.

The purpose of the invention is to increase the efficiency of the rebuilder.

The drawing is a schematic diagram of a variable voltage to constant voltage converter.

 The Converter contains a transformer 1 with the primary and secondary windings. The first input terminal of the converter is connected to the cathode of diode 2 and the anode of diode 3. The first terminal of the primary winding of transformer 1 is connected to the drains of two groups of MOS transistors 4, 5, and the second terminal forms the second input terminal of the converter. Extreme terminals of the secondary winding of the transformer 1 are connected to

The input of the rectifier 6, the output of which is parallel to each other, the capacitor 7 and the load 8. The output of the control circuit 9 is connected to the gate of the MOS transistors 4, 5. The sources and the substrate of the MOS transistors 4 are connected to the anode of the diode 2, and the sources and the substrate of the MOS -transistors 5 - to the cathode of diode 3. Capacitor 7 performs the functions of energy storage. As load 8, various devices and elements (e.g., gas discharge lamps) can be used.

The Converter operates as follows.

With a positive input voltage half-wave, the open states of the MOS transistors 4 determine the flow of current in the primary winding of the transformer 1, since the diode 2 for this mode is switched in the transmission direction. When otrtschON O Oh)

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In the initial half-wave of the input voltage, the flow of current in the primary winding is determined by the states of the MOS transistors 5, since for this mode the diode 3 is already connected in the transmission direction. To open the MOS transistors 4, positive pulses are received from the control circuit 9 on their gates, and negative pulses to open the MOS transistors 5. The frequency of the trigger pulses arriving at the gates of MOS transistors 4 and 5 must be much higher than the frequency of the input voltage. As a result, for one half-wave of the input voltage, the current will repeatedly flow through the primary winding of the transformer 1 in one direction. The signals of the secondary winding of transformer 1 are converted by rectifier 6 into a pulsating unipolar voltage supplied to a capacitive energy storage device - capacitor 7. When the load (ignition) is connected 8, the capacitor 7 is discharged to the load 8.

The reduction in loss resistance in the converter is achieved primarily through the use of parallel connections of k MIS transistors, the number of which depends on the specific technical requirements.

Balancing modes of MOS transistors 4 is achieved due to negative feedback formed by diode 2, and balancing of MOS transistors 5 is due to negative feedback generated by diode 3. The absence of rectifiers and filters between the input terminals of the device helps to reduce losses (currents through the diodes flow only when open

MOS transistors) and reduces the weight and dimensions of the device. The minimum operating frequency of transformer 1 is only by the magnitude of the frequency of the input voltage less than the frequency of the triggering pulses of the control circuit 9, which can reach several megahertz.

Claims (1)

Claims of the Inverter AC-to-DC converter containing a transformer, an output rectifier whose input is connected to the terminals of the secondary winding of the transformer, and the output forms the output terminals for connecting the load. between which a capacitor is connected, k MIS transistors with an induced n-channel (k is any integer greater than or equal to two), the source and the substrate of each of which are interconnected, the circuit control, the output of which is connected to the gate of the first MOS transistor, and two diodes, the first of which is connected by anode to the source of the first MOS transistor, and by cathode to the first input terminal for connecting the power source and the anode of the second diode, characterized in that In order to increase efficiency, it additionally introduces k MOS transistors with induced p-channel, sources and the substrates of which are connected to the cathode of the second diode, and the gates to the combined gates of MIS transistors with a p-channel, the drains of all MOS transistors are connected to the first terminal of the primary winding of the specified transformer, the second terminal of which is connected to the second input terminal, and the sources of all MDGG- transistors with n-channel combined and connected to the anode of the first diode. & ABOUT-