Multi-module-series-circuit-based module self-power-taking and protection circuit

Abstract

The invention relates to a multi-module-series-circuit-based module self-power-taking and protection circuit comprising a capacitor C1, a diode D1, a diode D2, and a capacitor C2. The diode D2 is connected in series with the capacitor C2 to form a module self-power-taking circuit; a cathode of the diode D2 is connected with a positive potential point C2+ of the capacitor C2; the capacitor C1 is connected in parallel to the diode D1; and a cathode of the diode D1 is connected with an anode of the diode D2, a positive potential point C1+ of the capacitor C1, and a positive potential point V+ ofa module. A negative potential point C1- of the capacitor C1 is connected to an anode of the diode D1, a negative potential point C2 of the capacitor C2, and a negative potential point V- of the module; a positive potential point Q+ of a non-controlled bridge / controllable bridge circuit direct-current side is connected with the positive potential point V+ of the module; a negative potential pointQ- of the non-controlled bridge / controllable bridge circuit direct-current side is connected with the negative potential point V- of the module; a positive potential point C2+ of the capacitor C2 is connected with a positive potential point V+ of a power-taking power supply; and a negative potential point C2- of the capacitor C2 is connected with a negative potential point - of the power-taking power supply.

Description

technical field [0001] The invention relates to a module self-feeding and protection circuit of a multi-module series circuit. Background technique [0002] At present, regardless of the multi-module input series output parallel circuit or the multi-module input parallel output series circuit, the voltage level of the series part is relatively high, and each module uses an uncontrolled bridge circuit and a controllable bridge circuit plus a high-voltage high-frequency transformer for isolation and transformation. , if the input of the power supply is directly connected to the multi-module series circuit, the insulation requirements of the power supply will inevitably be increased, and the design difficulty of the power supply will be increased. At the same time, any module in the multi-module series circuit has an open circuit fault, so that the entire series circuit system has no current loop and cannot work normally, and the entire system is paralyzed. [0003] For the ab...

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Problems solved by technology

[0002] At present, regardless of the multi-module input series output parallel circuit or the multi-module input parallel output series circuit, the voltage level of the series part is relatively high, and each module uses an uncontrolled bridge circuit and a controllable bridge circuit plus a high-voltage high-frequency transformer for isolation and transformation. , if the input of the power supply is directly connected to the multi-module series circuit, it will inevitably increase the insulation requirements of the power supply and increase the design difficulty of the power supply

At the same time, any module in the multi-module series circuit has an open circuit fault, so that the entire series circuit system has no current loop and cannot work normally, and the entire system is paralyzed.

[0003] For the above-mentioned problem of taking power from the power supply, the traditional method is to take power through the module capacitor, and decoupling with other modules is called self-power. The self-power method greatly reduces the insulation level of the power supply, but when it is not controlled After a short-circuit fault occurs in the bridge / controllable bridge circuit, the capacitor is also discharged, so that the voltage of the power supply is also reduced, and the reliability is reduced

For module protection, the traditional method is to shut down the entire series system, which reduces the reliability of the system; there are also some methods that add multiple controllable devices to the circuit to coordinate actions to ensure that the system continues to operate, but this method requires accurate Controlling the on-off of each controllable device is more difficult and less reliable

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