Energy-saving and noise-reducing control circuit of electromagnetic valve and contactor

Abstract

The utility model discloses an energy-saving noise-reduction control circuit of a solenoid valve and a contactor. The circuit comprises a bridge rectifier circuit D1, a capacitor C1, a resistor R2, a resistor R3, a coil J1, a bidirectional silicon controlled rectifier Q0, a diode D3, an MOS tube Q1, a resistor R5, a resistor R6 and a capacitor C2. The control circuit is connected to the front end of the electromagnetic valve or the contactor, and at the moment after the control circuit is electrified, full voltage is supplied to the two ends of the solenoid of the electromagnetic valve or the contactor through the rectifying circuit and the bidirectional silicon controlled rectifier, so that the electromagnetic valve or the contactor reliably acts; and after short time delay, the Q0 is cut off, so that the coil and the capacitor C1 are connected in series, the voltage at the two ends of the coil is reduced, and the electromagnetic valve or the contactor is maintained in a state of just closing, the closing state of the electromagnetic valve or the contactor can be just maintained, the power consumption is reduced, the heating is reduced, the service life is prolonged, and the device is quiet and silent in a long-term operation process.

Description

Technical Field

[0001] The utility model relates to the field of energy-saving and noise-reduction control circuits, in particular to an energy-saving and noise-reduction control circuit for a solenoid valve or a contactor. Background Art

[0002] A large number of AC solenoid valves and contactors are used in industrial and agricultural production processes. They can be used with different circuits to achieve the desired control, and the control accuracy and flexibility can be guaranteed. However, there is a major problem with existing AC solenoid valves and contactors, that is, the coils heat up and emit AC humming noise during operation, which consumes energy, affects the environment, and can even cause equipment damage in severe cases. Utility Model Content

[0003] The utility model aims to provide an energy-saving and noise-reducing control circuit for a solenoid valve and a contactor, so as to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] An energy-saving and noise-reducing control circuit for a solenoid valve and a contactor, comprising a bridge rectifier circuit D1, a capacitor C1, a resistor R2, a resistor R3, a coil J1, a bidirectional thyristor Q0, a diode D3, a MOS tube Q1, a resistor R5, a resistor R6 and a capacitor C2;

[0006] The bridge rectifier circuit D1 is connected to the L terminal of the mains, and the bridge rectifier circuit D1 is connected to the second end of the coil J1, the first end of the resistor R2 and the first end of the capacitor C1;

[0007] A first end of the coil J1 is connected to a first end of the resistor R2 and a first end of the resistor R3;

[0008] The second end of the resistor R2 is connected to the third end of the bidirectional thyristor Q0 and the drain D end of the MOS tube Q1;

[0009] The second end of the resistor R3 is connected to the anode of the diode D3;

[0010] The second end of the capacitor C1 is connected to the N end of the mains, the second end of the bidirectional thyristor Q0, the source S end of the MOS tube Q1, the second end of the resistor R6 and the second end of the capacitor C2, and all are grounded;

[0011] The gate G end of the MOS tube Q1 is connected to the first end of the resistor R6 and the first end of the resistor R5;

[0012] The second end of the resistor R5 is connected to the cathode of the diode D3 and the first end of the capacitor C2.

[0013] More optimally, the bridge rectifier circuit D1 includes four diodes, and the four diodes are connected head to tail in sequence.

[0014] More optimally, the first end of the bridge rectifier circuit D1 is connected to the first end of the resistor R2, the first end of the resistor R3 and the first end of the coil J1;

[0015] The second end of the bridge rectifier circuit D1 is connected to the second end of the capacitor C1 and the first end of the bidirectional thyristor Q0;

[0016] The third terminal of the bridge rectifier circuit D1 is connected to the L terminal of the mains;

[0017] The fourth end of the bridge rectifier circuit D1 is connected to the second end of the coil J1.

[0018] More optimally, the resistor R2 is 100KΩ, the resistor R3 is 100KΩ, the resistor R5 is 10KΩ, the resistor R6 is 10KΩ, the capacitor C2 is 10μF, and the voltage is 25V.

[0019] In the above technical solution, the energy-saving and noise-reduction control circuit is used to be connected to the front end of the solenoid valve or contactor, and the voltage at both ends of the solenoid valve or contactor coil is reduced to just maintain the energized state of the solenoid valve or contactor through the capacitive reactance of capacitor C1 and the resistance of coil J1 in series voltage division. As the voltage at both ends of the coil of the solenoid valve or contactor is reduced, the power consumption of the solenoid valve or contactor is reduced, thereby reducing noise. After that, if the mains input is cut off, the solenoid valve or contactor will be released immediately, and the voltage on the C2 capacitor will be released through resistors R5 and R6, preparing for the next connection to the mains.

[0020] Compared with the prior art, the utility model has the following beneficial effects: the utility model is connected to the front end of the solenoid valve or contactor, and after the mains is supplied to actuate the solenoid valve or contactor, the voltage at both ends of the coil of the solenoid valve or contactor is reduced to a level just sufficient to maintain the solenoid valve or contactor in the attracted state through the capacitor C1 and the coil J1 resistor series voltage division, so that the attraction is reliable, the coil does not heat up, and the operation is quiet and silent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 The utility model is a schematic diagram of a structure of an energy-saving and noise-reducing control circuit of a solenoid valve and a contactor. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 , the utility model provides a technical solution: an energy-saving and noise-reducing control circuit for a solenoid valve and a contactor, comprising a bridge rectifier circuit D1, a capacitor C1, a resistor R2, a resistor R3, a coil J1, a bidirectional thyristor Q0, a diode D3, a MOS tube Q1, a resistor R5, a resistor R6 and a capacitor C2;

[0025] The bridge rectifier circuit D1 is connected to the L terminal of the mains, and the bridge rectifier circuit D1 is connected to the second end of the coil J1, the first end of the resistor R2 and the first end of the capacitor C1;

[0026] A first end of the coil J1 is connected to a first end of the resistor R2 and a first end of the resistor R3;

[0027] The second end of the resistor R2 is connected to the third end of the bidirectional thyristor Q0 and the drain D end of the MOS tube Q1;

[0028] The second end of the resistor R3 is connected to the anode of the diode D3;

[0029] The second end of the capacitor C1 is connected to the N end of the mains, the second end of the bidirectional thyristor Q0, the source S end of the MOS tube Q1, the second end of the resistor R6 and the second end of the capacitor C2, and all are grounded;

[0030] The gate G end of the MOS tube Q1 is connected to the first end of the resistor R6 and the first end of the resistor R5;

[0031] The second end of the resistor R5 is connected to the cathode of the diode D3 and the first end of the capacitor C2.

[0032] The bridge rectifier circuit D1 includes four diodes, and the four diodes are connected head to tail in sequence.

[0033] A first end of the bridge rectifier circuit D1 is connected to a first end of the resistor R2, a first end of the resistor R3 and a first end of the coil J1;

[0034] The second end of the bridge rectifier circuit D1 is connected to the second end of the capacitor C1 and the first end of the bidirectional thyristor Q0;

[0035] The third terminal of the bridge rectifier circuit D1 is connected to the L terminal of the mains;

[0036] The fourth end of the bridge rectifier circuit D1 is connected to the second end of the coil J1.

[0037] The resistor R2 is 100KΩ, the resistor R3 is 100KΩ, the resistor R5 is 10KΩ, the resistor R6 is 10KΩ, the capacitor C2 is 10μF, and the voltage is 25V.

[0038] The working principle of the utility model is as follows: when the control circuit is energized, that is, the mains (220V or 380V) is added between L and N of the control circuit, after passing through the bridge rectifier circuit D1, a pulsating DC voltage of about 300V to 450V is generated at both ends of the coil of the solenoid valve or contactor, prompting the solenoid valve or contactor to operate. At this time, the pulsating DC voltage is added to the trigger pole of the bidirectional thyristor Q0, that is, the third end of the bidirectional thyristor Q0, through the resistor R2, so that the bidirectional thyristor Q0 is turned on.

[0039] The pulsating DC voltage continuously charges the capacitor C2 through the resistor R3 and the diode D3. After about hundreds of milliseconds, the voltage of the capacitor C2 rises to the turn-on voltage of the MOS tube Q1, causing the MOS tube Q1 to turn on and the bidirectional thyristor Q0 to turn off. At this time, the main circuit current of the city power supply will be forced to change the route, that is, through the bridge rectifier circuit D1, the coil J1, and the capacitor C1. At this time, due to the capacitive reactance of the capacitor C1 and the series voltage division of the coil J1 resistance, the voltage at both ends of the solenoid valve or contactor coil package will be reduced to about 30V, just maintaining the solenoid valve or contactor in the closed state. Due to the reduction in the voltage at both ends of the solenoid valve or contactor coil package, the power consumption of the solenoid valve or contactor is reduced. Because the power consumption of the solenoid valve or contactor is reduced, the noise of the solenoid valve or contactor will also be reduced.

[0040] After that, if the AC power input is cut off, the solenoid valve or contactor will be released immediately, and the voltage on the capacitor C2 will be released through resistors R5 and R6, preparing for the next connection to the AC power.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An energy-saving and noise-reducing control circuit for a solenoid valve and a contactor, characterized in that: The circuit includes a bridge rectifier circuit D1, a capacitor C1, a resistor R2, a resistor R3, a coil J1, a bidirectional thyristor Q0, a diode D3, a MOS tube Q1, a resistor R5, a resistor R6 and a capacitor C2; The bridge rectifier circuit D1 is connected to the L terminal of the mains, and the bridge rectifier circuit D1 is connected to the second end of the coil J1, the first end of the resistor R2 and the first end of the capacitor C1; The first end of the coil J1 is connected to the first end of the resistor R2 and the first end of the resistor R3; The second end of the resistor R2 is connected to the third end of the bidirectional thyristor Q0 and the drain D end of the MOS tube Q1; The second end of the resistor R3 is connected to the anode of the diode D3; The second end of the capacitor C1 is connected to the N end of the mains, the second end of the bidirectional thyristor Q0, the source S end of the MOS tube Q1, the second end of the resistor R6 and the second end of the capacitor C2, and all are grounded; The gate G end of the MOS tube Q1 is connected to the first end of the resistor R6 and the first end of the resistor R5; The second end of the resistor R5 is connected to the cathode of the diode D3 and the first end of the capacitor C2.

2. The energy-saving and noise-reducing control circuit of a solenoid valve and a contactor according to claim 1, characterized in that: The bridge rectifier circuit D1 includes four diodes, and the four diodes are connected head to tail in sequence.

3. The energy-saving and noise-reducing control circuit of a solenoid valve and a contactor according to claim 2, characterized in that: The first end of the bridge rectifier circuit D1 is connected to the first end of the resistor R2, the first end of the resistor R3 and the first end of the coil J1; The second end of the bridge rectifier circuit D1 is connected to the second end of the capacitor C1 and the first end of the bidirectional thyristor Q0; The third terminal of the bridge rectifier circuit D1 is connected to the L terminal of the mains; The fourth end of the bridge rectifier circuit D1 is connected to the second end of the coil J1.

4. The energy-saving and noise-reducing control circuit of a solenoid valve and a contactor according to claim 1, characterized in that: The resistor R2 is 100KΩ, the resistor R3 is 100KΩ, the resistor R5 is 10KΩ, the resistor R6 is 10KΩ, the capacitor C2 is 10μF, and the voltage is 25V.

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