A normally closed electromagnetic valve application circuit

Abstract

The utility model discloses a normally closed electromagnetic valve application circuit, including power supply circuit, first power supply circuit and second power supply circuit, first power supply circuit with second power supply circuit is electric connection with the output of power supply circuit respectively, power supply circuit includes power interface P1, rectifier bridge BD1, power management chip U1 and transformer T1, power interface P1 is electric connection with transformer T1 through rectifier bridge BD1 with transformer T1 is electric connection with power management chip U1. The utility model discloses a normally closed electromagnetic valve application circuit, and it is linked through power supply circuit, first power supply circuit and second power supply circuit, and the power supply of coil is given through the discharge of capacitor when power failure, thereby realizes the emergency cut -off of power failure, and it has practicality height, security height and the advantages such as wide range of application.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve technology, specifically relating to an application circuit for a normally closed electromagnetic valve. Background Technology

[0002] Normally closed gas solenoid valves play a crucial safety role in gas supply systems. In case of emergencies such as gas leaks or fires, the coil can be quickly energized by mains power, thereby triggering the valve core to cut off the gas supply and prevent the accident from escalating.

[0003] Existing solenoid valves lose their emergency shut-off function when power is cut off, posing a certain safety hazard.

[0004] Therefore, further improvements will be made to address the aforementioned issues. Utility Model Content

[0005] The main purpose of this utility model is to provide a normally closed solenoid valve application circuit, which is linked by a power supply circuit, a first power supply circuit and a second power supply circuit. When the power is off, the coil is powered by capacitor discharge, thereby realizing emergency cut-off when the power is off. It has the advantages of high practicality, high safety and wide applicability.

[0006] To achieve the above objectives, this utility model provides a normally closed solenoid valve application circuit, including a power supply circuit, a first power supply circuit, and a second power supply circuit. The first power supply circuit and the second power supply circuit are electrically connected to the output terminal of the power supply circuit, wherein:

[0007] The power supply circuit includes a power interface P1 (connected to AC power), a rectifier bridge BD1, a power management chip U1, and a transformer T1. The power interface P1 is electrically connected to the transformer T1 through the rectifier bridge BD1, and the transformer T1 is electrically connected to the power management chip U1. The output terminal (i.e., pin 2) of the transformer T1 is electrically connected to one end of the resistor R13 through a diode D1.

[0008] The first power supply circuit includes a diode D2, a capacitor C7, and a transistor T2. The anode of the diode D2 is electrically connected to the other end of the resistor R13. One cathode of the diode D2 is grounded through the capacitor C7, and the other is electrically connected to the source of the transistor T2. One drain of the transistor T2 is electrically connected to the second end of the coil load interface P2, and the other is electrically connected to the first end of the coil load interface P2 through a diode D8. The end of the capacitor C7 furthest from the diode D2 is electrically connected to the anode of the diode D8. A resistor R14 is connected between the source and gate of the transistor T2, and the gate of the transistor T2 is grounded in sequence through a resistor R15 and a transistor T4.

[0009] The second power supply circuit includes a diode D7, a capacitor C8, and a transistor T3. The anode of the diode D7 is electrically connected to the other end of the resistor R13. One cathode of the diode D7 is grounded through the capacitor C8, and the other is electrically connected to the source of the transistor T3. The drain of the transistor T3 is electrically connected to the second end of the coil load interface P2 (connected to the coil of the solenoid valve). The end of the capacitor C8 away from the diode D7 is electrically connected to the first end of the coil load interface P2. A resistor R17 is connected between the source and the gate of the transistor T3, and the gate of the transistor T3 is grounded in sequence through a resistor R19 and a transistor T5.

[0010] As a further preferred embodiment of the above technical solution, the cathode of the diode D2 is also grounded through resistor R12 and light-emitting diode LED1 (for indication).

[0011] As a further preferred embodiment of the above technical solution, the cathode of the diode D7 is also grounded through resistor R16 and light-emitting diode LED2 (for indication).

[0012] As a further preferred embodiment of the above technical solution, a resistor R1 and a capacitor C1 are connected in series across the two ends of the diode.

[0013] As a further preferred technical solution to the above technical solution, the coil load interface P2 is used to connect the coil of the solenoid valve. Attached Figure Description

[0014] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0015] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0016] This utility model discloses an application circuit for a normally closed solenoid valve. The specific embodiments of the utility model are further described below with reference to preferred embodiments.

[0017] In the embodiments of this utility model, those skilled in the art will note that the solenoid valves and the like involved in this utility model can be considered as prior art.

[0018] Preferred embodiment.

[0019] like Figure 1As shown, this utility model discloses an application circuit for a normally closed solenoid valve, including a power supply circuit, a first power supply circuit, and a second power supply circuit. The first power supply circuit and the second power supply circuit are electrically connected to the output terminal of the power supply circuit, wherein:

[0020] The power supply circuit includes a power interface P1 (connected to AC power), a rectifier bridge BD1, a power management chip U1, and a transformer T1. The power interface P1 is electrically connected to the transformer T1 through the rectifier bridge BD1, and the transformer T1 is electrically connected to the power management chip U1. The output terminal (i.e., pin 2) of the transformer T1 is electrically connected to one end of the resistor R13 through a diode D1.

[0021] The first power supply circuit includes a diode D2, a capacitor C7, and a transistor T2. The anode of the diode D2 is electrically connected to the other end of the resistor R13. One cathode of the diode D2 is grounded through the capacitor C7, and the other is electrically connected to the source of the transistor T2. One drain of the transistor T2 is electrically connected to the second end of the coil load interface P2, and the other is electrically connected to the first end of the coil load interface P2 through a diode D8. The end of the capacitor C7 furthest from the diode D2 is electrically connected to the anode of the diode D8. A resistor R14 is connected between the source and gate of the transistor T2, and the gate of the transistor T2 is grounded in sequence through a resistor R15 and a transistor T4.

[0022] The second power supply circuit includes a diode D7, a capacitor C8, and a transistor T3. The anode of the diode D7 is electrically connected to the other end of the resistor R13. One cathode of the diode D7 is grounded through the capacitor C8, and the other is electrically connected to the source of the transistor T3. The drain of the transistor T3 is electrically connected to the second end of the coil load interface P2 (connected to the coil of the solenoid valve). The end of the capacitor C8 away from the diode D7 is electrically connected to the first end of the coil load interface P2. A resistor R17 is connected between the source and the gate of the transistor T3, and the gate of the transistor T3 is grounded in sequence through a resistor R19 and a transistor T5.

[0023] Specifically, the cathode of the diode D2 is also grounded through resistor R12 and light-emitting diode LED1 (for indication).

[0024] More specifically, the cathode of the diode D7 is also grounded through resistor R16 and light-emitting diode LED2 (for indication).

[0025] Furthermore, a resistor R1 and a capacitor C1 are connected in series across the two ends of the diode.

[0026] Furthermore, the coil load interface P2 is used to connect the coil of the solenoid valve.

[0027] Regarding this utility model:

[0028] When the mains power supply is normal, the coil of the coil load interface P2 is powered through the power supply circuit, so as to cut off the power supply in case of emergency.

[0029] When power is lost, this invention provides power to the coil through a double safety mechanism of a first power supply circuit and a second power supply circuit. Even if one power supply circuit fails, the other power supply circuit can still be confirmed to be supplying power to the coil. Taking the first power supply circuit as an example, during normal power supply, capacitor C7 is charged and stores electrical energy. The principle of power supply to P2 during power loss is as follows:

[0030] A capacitor's characteristic is its ability to store and release electrical charge. During normal operation, C7 is charged in the circuit, accumulating charge between its plates and storing electric field energy. After power is cut off, a voltage exists across its terminals, attempting to release the charge through an external circuit. At this time, C7 forms a discharge path through a circuit consisting of resistors R14 and R15, transistor T4, etc. The voltage across C7 causes current to flow out, ultimately supplying power to the coil and enabling the emergency shut-off function of the solenoid valve during power failure.

[0031] It is worth mentioning that the technical features such as the solenoid valve involved in this utility model patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be adopted using conventional choices in the field, and should not be regarded as the inventive point of this utility model patent. This utility model patent will not elaborate further.

[0032] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A normally closed solenoid valve application circuit, characterized in that, It includes a power supply circuit, a first power supply circuit, and a second power supply circuit, wherein the first power supply circuit and the second power supply circuit are electrically connected to the output terminal of the power supply circuit, wherein: The power supply circuit includes a power interface P1, a rectifier bridge BD1, a power management chip U1, and a transformer T1. The power interface P1 is electrically connected to the transformer T1 through the rectifier bridge BD1, and the transformer T1 is electrically connected to the power management chip U1. The output terminal of the transformer T1 is electrically connected to one end of the resistor R13 through a diode D1. The first power supply circuit includes a diode D2, a capacitor C7, and a transistor T2. The anode of the diode D2 is electrically connected to the other end of the resistor R13. One cathode of the diode D2 is grounded through the capacitor C7, and the other is electrically connected to the source of the transistor T2. One drain of the transistor T2 is electrically connected to the second end of the coil load interface P2, and the other is electrically connected to the first end of the coil load interface P2 through a diode D8. The end of the capacitor C7 furthest from the diode D2 is electrically connected to the anode of the diode D8. A resistor R14 is connected between the source and gate of the transistor T2, and the gate of the transistor T2 is grounded in sequence through a resistor R15 and a transistor T4. The second power supply circuit includes a diode D7, a capacitor C8, and a transistor T3. The anode of the diode D7 is electrically connected to the other end of the resistor R13. One cathode of the diode D7 is grounded through the capacitor C8, and the other is electrically connected to the source of the transistor T3. The drain of the transistor T3 is electrically connected to the second end of the coil load interface P2. The end of the capacitor C8 away from the diode D7 is electrically connected to the first end of the coil load interface P2. A resistor R17 is connected between the source and the gate of the transistor T3, and the gate of the transistor T3 is grounded in sequence through a resistor R19 and a transistor T5.

2. The normally closed solenoid valve application circuit according to claim 1, characterized in that, The cathode of diode D2 is also grounded through resistor R12 and light-emitting diode LED1.

3. The normally closed solenoid valve application circuit according to claim 2, characterized in that, The cathode of diode D7 is also grounded through resistor R16 and light-emitting diode LED2.

4. The normally closed solenoid valve application circuit according to claim 3, characterized in that, A resistor R1 and a capacitor C1 are connected in series across the two ends of the diode.

5. The normally closed solenoid valve application circuit according to claim 4, characterized in that, The coil load interface P2 is used to connect the coil of the solenoid valve.

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