Power reactive power compensation capacitance detection and AC contactor protection circuit

Abstract

The invention discloses a power reactive compensation capacitor detection and AC contactor protection circuit, comprising a neutral line L1, a live line N1, a switch KM1, bridge rectifying diodes D1 to D4, bridge rectifying diodes D9 to D12, optical inductive coupler IC1 to I3, Zener Diodes VD1 To VD2, transistors Q1 to Q7, Diodes D5 to D8, a relay J1, a relay normally close contact JI-1, a Relaynormally closed contact JI-2, A Relay normally closed contact JI-3, an AC contactor K1, AC contactor normally closed contact K1-1, an AC contactor normally closed contact K1-2, a Normally closed contact K1-2, an AC contactor normally closed contact K1-3, Reactive Compensation Capacitors CL1 to CL3, Capacitors C1 to C4, Resistor R1 to R15, and a buzzer Y1; By setting reactive power compensation capacitor detection and AC contactor protection circuit, the reactive power compensation capacitor on the three-phase voltage works in parallel with the three-phase voltage, so that the power equipmentused can obtain the capacitor compensation power, and at the same time, When the AC contactor is turned on instantaneously, the reactive current compensation capacitor is turned on, and the arc generated by the high current charging is instantaneously prevented from burning the AC contactor.

Description

technical field [0001] The invention relates to the field of electronic equipment, in particular to electric reactive power compensation capacitance detection and AC contactor protection circuits. Background technique [0002] Capacitors are widely used in many terminal electronic devices, for example, AC contacts for touch control on the display screen of terminal devices. [0003] The working principle of the AC contactor is to use the electromagnetic force to cooperate with the spring force to realize the connection and disconnection of the contacts. The AC contactor has two working states: de-energized state (release state) and energized state (action state). When the attraction coil is energized, the static iron core generates electromagnetic attraction force, the armature is attracted, and the connecting rod connected with the armature drives the contact to move, so that the normally closed contact breaker contactor is in an energized state; when the attraction coil i...

AI Technical Summary

Problems solved by technology

[0004] During the use of traditional reactive compensation capacitance detection, because the circuit does not have the effect of controlling the normally open contact of the AC contactor, the arc generated by the instantaneous high current charging will burn the AC contactor, and even destroy the circuit components. , serious cause fire, endanger people's life and property safety

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