RU2038682C1 - Capacitor storage charging device - Google Patents

Abstract

FIELD: conversion engineering. SUBSTANCE: device has step-up transformer, inductance-capacitance converter, bridge-type rectifier, and storage capacitor. Transformer is connected at device input; converter inductance coil is built up of two coils of similar inductance placed on common core with air gap and inserted between transformer secondary and capacitor leads of converter which is connected through bridge-type rectifier to storage capacitor. EFFECT: improved power and frequency characteristics, reduced size and cost. 1 dwg

Description

 The invention relates to a conversion technique and can be used to charge a capacitive storage device in various devices, for example, in magnetic pulse processing of metals, in pumping generators of pulsed optical quantum generators, in capacitor electric welding machines, etc.

Known charger, in which to limit the charge current is used the inductive resistance of the step-up transformer, increased by expanding the windings of low and high voltage on the core [1] However, the efficiency of this circuit does not exceed 70%
A device for charging a capacitive storage device that contains a serially connected power source, a voltage converter, a primary winding of an auxiliary transformer, an inductive-capacitive converter of a voltage source into a constant current source, a step-up transformer, a bridge rectifier, a storage capacitor, while a parallel is connected to the secondary winding of the auxiliary transformer LC circuit, which is also connected to a storage capacitor via a second rectifier [2]
The device has an increased efficiency due to the charge of the storage capacitor from a constant current source, which is a sequential LC circuit tuned in resonance with the voltage source, in which a load is connected in parallel with the capacitor (step-up transformer).

 The device has the following main disadvantages.

 The step-up transformer must have a rated power equal to the product of the charging current by the maximum charge voltage of the drive. And since during the charge the voltage on the drive increases linearly from zero to maximum, the average power passing through the transformer is half the nominal. The next group of disadvantages is associated with an inductive-capacitive converter, which has poor frequency and energy characteristics.

 The elimination of these disadvantages is achieved by the fact that in the charge device of a capacitive storage device containing an inductive-capacitive converter, a step-up transformer, a bridge rectifier and a storage capacitor, the transformer is turned on at the input of the device, while in the inductive-capacitive converter the inductance is made in the form of two identical inductance coils, placed on a common magnetic circuit with an air gap and connected between the terminals of the secondary winding of the transformer and the converter capacitor, to to which a storage capacitor is connected through a bridge rectifier.

Presented on the drawing, the electrical circuit of the proposed device contains a step-up transformer T, the primary winding ω _{1 of} which is connected to an AC voltage source. Inductive-capacitive converter L, C, L, in which the inductance is made in the form of two identical inductors L, placed on a common magnetic circuit M with an air gap and connected between the terminals of the secondary winding ω _{2 of the} transformer T and the capacitor C of the converter. A common magnetic circuit provides a magnetic connection between the coils, and its air gap is linear. A capacitor Cb is connected to the terminals of the capacitor C through a bridge rectifier DD.

 The scheme works as follows.

At the beginning of the charge, when the drive Сb is completely discharged, the charge current of the drive is equal to the ratio of the secondary winding voltage ω _{2 of the} transformer T to the sum of the reactance of the coils L. As the voltage increases on the drive Cb, the latter exerts less and less shunt effect on the capacitor C, and the mode of operation of the circuit more and more approaching resonance, and therefore, the voltage increases on the capacitor C and the storage device Cb, while the charge current remains unchanged.

 Due to the fact that in the proposed device the transformer is connected in front of the inductive-capacitive converter, the voltage on the transformer windings does not change during charging, therefore it has half the rated power and, consequently, the smaller dimensions, weight and cost.

 The linear magnetic coupling between the inductors made it possible to almost halve their inductance, sharply improve the energy and frequency characteristics of the converter, and therefore the device as a whole.

 Thus, the proposed device has the best energy and frequency characteristics, smaller dimensions, weight and cost.

Claims (1)

 CAPACITIVE DRIVE CHARGING DEVICE, containing output terminals for connecting an AC voltage source, an inductive-capacitive converter, the capacitor of which is connected parallel to its output, a step-up transformer with primary and secondary windings, and also a bridge rectifier, the output of which is connected to a storage capacitor, characterized in that the output of the bridge rectifier is connected to the output of the inductive-capacitive converter, the inductive element of which is made in the form of two identical coils in uktivnosti placed on a common magnetic circuit with air gap, each of which is connected between one of the terminals of the capacitor inductive capacitive transducer and a corresponding one of the terminals of the secondary winding of the step-up transformer whose primary winding is connected to said input terminals.

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