Driving circuit of solenoid valve

Abstract

The invention provides a driving circuit of a solenoid valve, comprising a first switch, a second switch, a first relay, a second relay, a first diode and a second diode, wherein the first switch is controlled by a first input voltage, and the second switch is controlled by a second input voltage; the first relay is controlled to start and stop by the first switch, and the second relay is controlled to start and stop by the second switch; the anode of the first diode is connected with an ACL (Alternating Current Live Line) end, the cathode of the second diode is connected with one end of the first relay, and the other end of the first relay is connected with an ACN ((Alternating Current Null Line) end; the cathode of the second diode is connected with the ACL end, the anode of the second diode is connected with one end of the second relay, and the other end of the second relay is connected with the ACN end. According to the embodiment of the invention, the solenoid valve is stable in driving way and low in energy consumption and is directly driven by the two relays so as to have the advantages that the price is low and the cost of a whole circuit board is reduced.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, and particularly designs a solenoid valve driving circuit. Background technique [0002] At present, the driving method of solenoid valves used in refrigeration equipment, such as refrigerators, is generally driven by solid state relays or thyristors. This driving method needs to detect the zero-crossing point of the circuit to control the opening and closing of the solid state relay or the thyristor. When the system power supply adopts the switching power supply scheme, the zero-crossing signal can only be detected on the strong side, which will consume relatively large power consumption in the zero-crossing detection circuit, which not only affects the reliability of the entire electronic control, but also causes Energy consumption is too high. On the other hand, the cost of this driving method is relatively high. [0003] In addition, most of the refrigerators currently used...

AI Technical Summary

Problems solved by technology

When the system power supply adopts the switching power supply scheme, the zero-crossing signal can only be detected on the strong side, which will consume relatively large power consumption in the zero-crossing detection circuit, which not only affects the reliability of the entire electronic control, but also causes Energy consumption is too high

On the other hand, the cost of this driving method is relatively high

[0003] In addition, most of the refrigerators currently used are switching power supplies. The high-power resistors consume a lot of power in the strong current zero-crossing detection. On the one hand, such high-power heating components are likely to cause High temperature aging, on the other hand, also has a certain impact on the energy efficiency of the whole machine

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