Simple and reliable energy storage power supply circuit

Abstract

The invention discloses a simple and reliable energy storage power supply circuit, and relates to the technical field of power systems. The circuit comprises a photoelectric coupler U2, an MOS (Metal Oxide Semiconductor) tube Q1 and a charging control chip U6, wherein a light emitting diode in the photoelectric coupler U2 is connected with a power supply output end by a resistor R6; a seventh pin of the charging control chip U6 is connected in parallel with a resistor R10 and a diode D15; a positive electrode of the diode D15 is divided into two ways; one way is connected with the photoelectric coupler U2 and a grid electrode of the MOS tube Q1 by a resistor R9 and a resistor R14; a drain electrode of the MOS tube Q1 is connected with a circuit between the diode D15 and the resistor R9; a source electrode of the MOS tube Q1 is connected with the photoelectric coupler U2; a capacitor C18 is connected in parallel between the source electrode of the MOS tube Q1 and a negative electrode of the diode D15; and one end of the resistor R10 is connected with an alternating current input end. Capacitive voltage of a discharge part of an energy storage power supply is fed back to the charging control chip U6 by the linear photoelectric coupler U2, and the charging control chip U6 controls an IGBT (Insulated Gate Bipolar Transistor) device with flyback charging by PWM (Pulse-Width Modulation), so that the charging speed is controlled.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a simple and reliable energy storage power supply circuit. Background technique [0002] At present, in the special application field of the power system, the opening and closing action of the circuit breaker is very demanding, and the conventional circuit breaker cannot meet the load's requirement on the operating speed of the circuit breaker. Therefore, our company has developed a fast circuit breaker based on eddy current disk drive, which is the core circuit of the drive mechanism of the circuit breaker. [0003] Such as figure 1 As shown, the circuit is the discharge part of the energy storage power supply. Under normal conditions, the thyristor Q4 is cut off, and the load power capacitor C20 is charged through the front flyback power supply. Normally, it can be charged to DC400V. X1 is represented by the eddy current disk. inductance. When the thyristor Q4 is turne...

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Problems solved by technology

[0004] A detailed problem in the above process is: the discharge time is very short, and the instantaneous overcurrent capability of the thyristor is very strong, generally 10 times its rated current, far stronger than other power electronic devices such as IGBT

However, the problem caused by the use of thyristors is the semi-controlled device, whose shutdown is uncontrollable. Before shutdown, its current must be less than the holding current, otherwise it cannot be shut down, which will cause the subsequent capacitors to fail to charge normally, and the circuit breaker fail

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