Surge absorption circuit for single-phase air conditioning system

Abstract

The invention relates to a circuit structure of a single-phase air conditioning system, in particular to a surge absorption circuit for the single-phase air conditioning system. The invention aims tosolve the problem that an existing surge absorption circuit cannot effectively resist high voltage of kilovolt surge. The surge absorption circuit: comprises an L line and an N line, wherein one endsof the L line and the N line are connected with a power supply, and the other ends of the L line and the N line are respectively connected with one pin of a rectifier bridge; a common-mode inductor, which comprises a magnetic ring, a first common-mode coil and a second common-mode coil, wherein the first common-mode coil and the second common-mode coil are respectively connected in series with theL line and the N line; a first surge absorption unit, which is connected to the side, close to the power supply, of the common-mode inductor and comprises a first piezoresistor, a second piezoresistor and a first discharge tube, wherein one ends of the first piezoresistor and the second piezoresistor are connected to the L line and the N line respectively, and the other ends of the first piezoresistor and the second piezoresistor are connected with each other and grounded through the first discharge tube; and a second surge absorption unit, which is connected to one side, close to the power supply, of the common-mode inductor and comprises a second discharge tube and a third piezoresistor, wherein the second discharge tube and the third piezoresistor are connected in series between the Lline and the N line. According to the invention, the absorption and endurance capability of the air conditioning circuit to thousands of volts of surge voltage can be improved.

Description

technical field [0001] The invention relates to a circuit structure of a single-phase air-conditioning system, in particular to a surge absorbing circuit for a single-phase air-conditioning system. Background technique [0002] Air-conditioning systems - especially the circuits of single-phase air-conditioning systems need to have the ability to resist lightning strikes and grid voltage spikes and surges. The instantaneous voltage of lightning strikes and power grid voltage surges may be as high as several thousand volts. Therefore, when performing surge simulation on the circuit of the air conditioning system, a high voltage of 6000V is usually used for testing, which often causes damage to the rectifier bridge or discharge tube, thereby causing the test to fail. [0003] Correspondingly, there is a need in the art for a new single-phase air-conditioning system surge absorbing circuit to solve the above problems. Contents of the invention [0004] In order to solve the ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the existing single-phase air-conditioning system surge absorbing circuit cannot effectively resist the surge high voltage of several thousand volts, the present invention provides a surge absorber for single-phase air-conditioning systems Absorbing circuit, the surge absorbing circuit includes: L line, whose first end is connected to the power supply, and whose second end is connected to a pin of the rectifier bridge of the single-phase air conditioning system; N line, whose first end is connected to the power supply connected, and the second end is connected to the other pin of the rectifier bridge of the single-phase air-conditioning system; a common-mode inductor, which includes a magnetic ring and a first common-mode coil and a second common-mode coil wound on the magnetic ring coil, the first common mode coil is connected in series in the L line, the second common mode coil is connected in series in the N line; a first surge absorbing unit is connected close to the common mode inductor One side of the power supply also includes a first piezoresistor, a second piezoresistor and a first discharge tube, one end of the first piezoresistor and the second piezoresistor are respectively connected to the L line and The N line, the other end of the first varistor and the second varistor are connected to each other and connected to the ground through the first discharge tube; it is characterized in that the surge absorbing circuit also includes a first Two surge absorbing units, the second surge absorbing unit is connected to the side of the common mode inductor close to the power supply and includes a second discharge tube and a third piezoresistor, the second discharge tube and the third varistor The third piezoresistors are connected in series between the L line and the N line

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