Input overvoltage protection circuit for energy storage PCS
A technology of overvoltage protection circuit and output circuit, applied in the field of electronics, can solve problems such as easy burnout of power supply circuits
Inactive Publication Date: 2018-11-30
CSIC SHANGHAI NEW ENERGY
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Problems solved by technology
[0003] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: when the input voltage is too high, it is easy to burn out the power supply circuit
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[0017] Examples such as figure 1 , figure 2 , image 3 As shown, an input overvoltage protection circuit for a switching power supply, the power supply circuit includes an electrically connected power supply circuit 1, an output circuit 2, an amplification circuit 4, a sampling circuit 5, a drive control circuit 6, a constant voltage constant current circuit 7, and a PFC correction circuit circuit 8 and input overvoltage protection circuit 9.
[0018] The power supply circuit 1 includes diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, resistor R1, resistor R2, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5 and switching transformer T, diode D1, The rectifier bridge composed of diode D2, diode D3, and diode D4, the switching transformer T has a first primary coil, a second primary coil and a secondary coil, the capacitor C3 is connected between the positive pole of the rectifier bridge and the ground, and one end of the resistor R1 is connect...
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Disclosed is an input overvoltage protection circuit for an energy storage PCS in the technical field of electronics. The input overvoltage protection circuit comprises a rectifier bridge DB1, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a resistor R33, a resistor R34, a resistor R35, a resistor R36, an adjustable resistor BP, an AND gate circuit U4, a three-terminal voltagestabilizer U5, a relay K1, a triode Q7 and a diode D14, wherein the input end of the rectifier bridge DB1 is connected with a power supply AC1 and a power supply AC2; the positive output end of the rectifier bridge DB1 is connected with one end of the capacitor C20, one end of the resistor R34 and one end of the resistor R36; the other end of the capacitor C20 is grounded; the other end of the resistor R34 is connected with one end of the capacitor C21, one end of the resistor R33 and the input end of the three-terminal voltage stabilizer U5; when the input voltage is normal, the normally closed contact of the relay K1 is closed, a switching power supply works normally; and when the input voltage is higher than 265V, the coil of the relay K1 is electrified, the normally closed contact ofthe relay K1 is disconnected, the switch power supply is powered off, and the switching power supply circuit is protected. After the input voltage is restored to be normal, the circuit automatically enters a working state.
Description
technical field [0001] The invention relates to a power supply circuit, in particular to an input overvoltage protection circuit suitable for a constant current switching power supply, which belongs to the field of electronic technology. Background technique [0002] At present, a traditional constant current switching power supply includes a power supply circuit, an output circuit, an amplifier circuit, a sampling circuit, a drive control circuit, a constant voltage constant current circuit and a PFC correction circuit. [0003] During the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: when the input voltage is too high, the power supply circuit is easy to burn out. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide an input overvoltage protection circuit for a switching power supply. After using the input overvoltage protection circu...
Claims
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IPC IPC(8): H02H7/125H02H3/20
CPCH02H7/1252H02H3/20
Inventor 李建军梁鹏飞梅亮
Owner CSIC SHANGHAI NEW ENERGY