Dual voltage model reset circuit

Abstract

The application discloses a dual-voltage type reset circuit, comprising a first voltage dividing circuit, a twelfth capacitor, a second voltage dividing circuit, a third voltage dividing circuit, a comparator, a twentieth resistor, a field effect transistor, a twenty-first resistor and a twenty-second resistor. The application has the following beneficial effects: after power-off, the field effect transistor can be quickly detected and actively turned on, the main capacitor charge can be quickly discharged through the high-power twenty-second resistor, the discharging speed is much faster than that of the traditional parallel resistor (R1-R8), and the residual voltage is completely eliminated. The application solves the risk of misoperation of the voltage doubling circuit caused by inconsistent capacitor discharging speed when 110V is switched to 220V, effectively protects the equipment from damage. Without the participation of software, the comparator and the resistance-capacitance network are used to realize power-off self-triggering, the response is rapid and the reliability is high, and the problem of software running out of control or failure is avoided. During normal work, the comparator output is low, the field effect transistor is turned off, and the twenty-second resistor is not connected, so that the whole circuit only consumes microampere-level current and does not affect the efficiency of the equipment.

Description

Technical Field

[0001] This invention relates to the field of dual-voltage welding equipment technology, and in particular to a dual-voltage model reset circuit. Background Technology

[0002] Currently, in the field of 110V / 220V dual-voltage welding equipment, to control development costs, the common practice is to use electrolytic capacitors with a withstand voltage of around 200V connected in series in the circuit. A voltage multiplier circuit is then controlled by software or external hardware to ensure the welding equipment can operate normally with either 110V or 220V AC power. However, in real-world applications, there are situations where 220V AC power is immediately switched on after 110V operation. If the electrolytic capacitor's discharge speed is insufficient, a failure of the software control or external hardware circuitry may occur, leading to serious damage to the welding equipment. Summary of the Invention

[0003] According to an embodiment of the present invention, a dual-voltage reset circuit is provided, comprising: a first voltage divider circuit, a twelfth capacitor, a second voltage divider circuit, a third voltage divider circuit, a comparator, a twentieth resistor, a field-effect transistor, a twenty-first resistor, and a twenty-second resistor; The first voltage divider circuit is connected to the DC+ bus of the external dual-voltage power supply welding equipment; One end of the twelfth capacitor is connected to the first voltage divider circuit, and the other end of the twelfth capacitor is connected to the DC bus of the external dual-voltage power supply welding equipment. The second voltage divider circuit is connected between one end of the twelfth capacitor and the first voltage divider circuit, and the second voltage divider circuit is connected to the DC bus DC-. The third voltage divider circuit is connected to the DC bus DC+ and the DC bus DC-; The inverting input of the comparator is connected to the second voltage divider circuit, and the non-inverting input of the comparator is connected to the third voltage divider circuit. One end of the twentieth resistor is connected to the output of the comparator, and the other end of the twentieth resistor is connected to the gate of the field-effect transistor and one end of the twenty-first resistor. The source of the field-effect transistor and the other end of the twenty-first resistor are connected to the DC bus DC-. One end of the 22nd resistor is connected to the drain of the field-effect transistor, and the other end of the 22nd resistor is connected to the DC bus DC+.

[0004] Furthermore, the first voltage divider circuit includes: a fourteenth resistor and a fifteenth resistor; One end of the fourteenth resistor is connected to the DC bus DC+, and the other end of the fourteenth resistor is connected to one end of the fifteenth resistor; The other end of the fifteenth resistor is connected to one end of the twelfth capacitor.

[0005] Furthermore, the second voltage divider circuit includes: a seventeenth resistor and a sixteenth resistor; One end of the seventeenth resistor is connected between one end of the twelfth capacitor and the first voltage divider circuit, and the other end of the seventeenth resistor is connected to the inverting input of the comparator and one end of the sixteenth resistor. The other end of the sixteenth resistor is connected to the DC bus DC-.

[0006] Furthermore, the third voltage divider circuit includes: an eighteenth resistor and a nineteenth resistor; One end of the eighteenth resistor is connected to the DC bus DC+, and the other end of the eighteenth resistor is connected to the non-inverting input of the comparator and one end of the nineteenth resistor; The other end of the nineteenth resistor is connected to the DC bus DC-.

[0007] Furthermore, it also includes: a diode, the negative terminal of which is connected between one end of the twelfth capacitor and the second voltage divider circuit, and the positive terminal of which is connected to the DC bus DC-.

[0008] A dual-voltage reset circuit according to an embodiment of the present invention has the following advantages: After power failure, it can quickly detect and actively turn on the field-effect transistor, and quickly discharge the main capacitor charge through the high-power 22nd resistor. The discharge speed is much faster than that of traditional parallel resistors (R1~R8), and completely eliminates residual voltage.

[0009] This solves the risk of voltage multiplier circuit malfunction caused by inconsistent capacitor discharge speed when switching from 110V to 220V, effectively protecting the equipment from damage.

[0010] Without the need for software intervention, it utilizes comparators and RC networks to achieve power-off self-triggering, resulting in rapid response and high reliability, avoiding software crashes or failures.

[0011] When operating normally, the comparator outputs a low level, the MOSFET is turned off, the 22nd resistor is not connected, and the entire circuit consumes only microamps of current, which does not affect the efficiency of the equipment.

[0012] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0013] Figure 1 This is a circuit diagram of a dual-voltage reset circuit according to an embodiment of the present invention.

[0014] Figure 2 Schematic diagram of traditional 110V / 220V dual-voltage power supply welding equipment. Detailed Implementation

[0015] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0016] First, combine Figure 1 This invention describes a dual-voltage reset circuit for use in dual-voltage power supply welding equipment, which has a wide range of applications.

[0017] like Figure 1 As shown, a dual-voltage reset circuit according to an embodiment of the present invention includes a first voltage divider circuit, a twelfth capacitor C12, a second voltage divider circuit, a third voltage divider circuit, a comparator U1A, a twentieth resistor R20, a field-effect transistor T5, a twenty-first resistor R21, and a twenty-second resistor R22.

[0018] Specifically, such as Figure 1 As shown, the first voltage divider circuit is connected to the DC+ bus of the external dual-voltage power supply welding equipment; one end of the twelfth capacitor C12 is connected to the first voltage divider circuit, and the other end of the twelfth capacitor C12 is connected to the DC- bus of the external dual-voltage power supply welding equipment; the second voltage divider circuit is connected between one end of the twelfth capacitor C12 and the first voltage divider circuit, and the second voltage divider circuit is connected to the DC- bus; the third voltage divider circuit is connected to both the DC+ and DC- buses; the inverting input of comparator U1A is connected to... The second voltage divider circuit is connected, and the non-inverting input terminal of comparator U1A is connected to the third voltage divider circuit; one end of the twentieth resistor R20 is connected to the output terminal of comparator U1A, and the other end of the twentieth resistor R20 is connected to the gate of field-effect transistor T5 and one end of the twentieth resistor R21; the source of field-effect transistor T5 and the other end of the twentieth resistor R21 are connected to the DC bus DC-; one end of the twentieth resistor R22 is connected to the drain of field-effect transistor T5, and one end of the twentieth resistor R22 is connected to the DC bus DC+.

[0019] Furthermore, such as Figure 1 As shown, the first voltage divider circuit includes: a fourteenth resistor R14 and a fifteenth resistor R15; one end of the fourteenth resistor R14 is connected to the DC bus DC+, and the other end of the fourteenth resistor R14 is connected to one end of the fifteenth resistor R15; the other end of the fifteenth resistor R15 is connected to one end of the twelfth capacitor C12.

[0020] Furthermore, such as Figure 1 As shown, the second voltage divider circuit includes: a seventeenth resistor R17 and a sixteenth resistor R16; one end of the seventeenth resistor R17 is connected between one end of the twelfth capacitor C12 and the first voltage divider circuit, and the other end of the seventeenth resistor is connected to the inverting input terminal of comparator U1A and one end of the sixteenth resistor R16; the other end of the sixteenth resistor R16 is connected to the DC bus DC-.

[0021] Furthermore, such as Figure 1 As shown, the third voltage divider circuit includes: an eighteenth resistor R18 and a nineteenth resistor R19; one end of the eighteenth resistor R18 is connected to the DC bus DC+, and the other end of the eighteenth resistor R18 is connected to the non-inverting input terminal of comparator U1A and one end of the nineteenth resistor R19; the other end of the nineteenth resistor R19 is connected to the DC bus DC-.

[0022] Furthermore, such as Figure 1 As shown, a dual-voltage reset circuit according to an embodiment of the present invention further includes: a diode Z1, the negative terminal of which is connected between one end of the twelfth capacitor C12 and the second voltage divider circuit, and the positive terminal of which is connected to the DC bus DC-.

[0023] like Figure 2 The diagram shown is a schematic of a traditional 110V / 220V dual-voltage power supply welding device. When the welding device is supplied with 110V or 220V AC power, it is charged through electrolytic capacitors C1, C2, C3, C4, C5, C6, C7, and C8. The voltage between DC+ and DC- is usually around 310V. After the power is turned off, R1, R2, R3, R4, R5, R6, R7, and R8 will dissipate the voltage on the electrolytic capacitors. Due to differences in capacitor capacity and resistance values, the discharge rate varies, posing a potential risk of damage to the welding device.

[0024] Will Figure 1 The circuit is connected to DC+ and DC-. When the welding equipment is working normally, resistors R16 (sixteenth) and R17 (seventeenth) power comparator U1A by dividing the voltage with resistors R14 (fourteenth) and R15 (fifteenth), while simultaneously charging capacitor C12. Resistors R19 (nineteenth) and R18 (eighteenth) are connected to the non-inverting input of comparator U1A by dividing the voltage. Resistors R16 (sixteenth) and R14 (fourteenth), R15 (fifteenth), and R17 (seventeenth) are connected to the inverting input of comparator U1A by dividing the voltage. At this time, comparator U1A outputs a low level. MOSFET T5, a high-power switching device, remains off. After the welding equipment is powered off, capacitor C12 continues to power comparator U1A. As the voltage across the electrolytic capacitor gradually decreases, comparator U1A outputs a high level. At this time, MOSFET T5 is on, rapidly consuming the remaining power supply through the high-power resistor R22. Finally, the voltage across the electrolytic capacitor reaches 0V, placing it in the "reset" state.

[0025] Above, refer to Figures 1-2 A dual-voltage reset circuit according to an embodiment of the present invention is described, which has the following advantages: After power failure, it can quickly detect and actively turn on the field-effect transistor T5, and quickly discharge the main capacitor charge through the high-power 22nd resistor R22. The discharge speed is much faster than that of traditional parallel resistors (R1~R8), and completely eliminates residual voltage.

[0026] This solves the risk of voltage multiplier circuit malfunction caused by inconsistent capacitor discharge speed when switching from 110V to 220V, effectively protecting the equipment from damage.

[0027] Without the need for software intervention, it utilizes comparator U1A and RC network to achieve power-off self-triggering, which is fast and highly reliable, avoiding software crashes or failures.

[0028] When operating normally, comparator U1A outputs a low level, MOSFET T5 is turned off, and resistor R22 is not connected. The entire circuit consumes only microamps of current and does not affect the efficiency of the equipment.

[0029] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A dual-voltage reset circuit, characterized in that, It includes: a first voltage divider circuit, a twelfth capacitor, a second voltage divider circuit, a third voltage divider circuit, a comparator, a twentieth resistor, a field-effect transistor, a twenty-first resistor, and a twenty-second resistor; The first voltage divider circuit is connected to the DC+ bus of the external dual-voltage power supply welding equipment; One end of the twelfth capacitor is connected to the first voltage divider circuit, and the other end of the twelfth capacitor is connected to the DC bus of the external dual-voltage power supply welding equipment. The second voltage divider circuit is connected between one end of the twelfth capacitor and the first voltage divider circuit, and the second voltage divider circuit is connected to the DC bus DC-. The third voltage divider circuit is connected to the DC bus DC+ and the DC bus DC-; The inverting input of the comparator is connected to the second voltage divider circuit, and the non-inverting input of the comparator is connected to the third voltage divider circuit. One end of the twentieth resistor is connected to the output terminal of the comparator, and the other end of the twentieth resistor is connected to the gate of the field-effect transistor and one end of the twentieth eleventh resistor. The source of the field-effect transistor and the other end of the 21st resistor are connected to the DC bus DC-. One end of the 22nd resistor is connected to the drain of the field-effect transistor, and the other end of the 22nd resistor is connected to the DC bus DC+. The first voltage divider circuit includes: a fourteenth resistor and a fifteenth resistor; One end of the fourteenth resistor is connected to the DC bus DC+, and the other end of the fourteenth resistor is connected to one end of the fifteenth resistor; The other end of the fifteenth resistor is connected to one end of the twelfth capacitor; The second voltage divider circuit includes: a seventeenth resistor and a sixteenth resistor; One end of the seventeenth resistor is connected between one end of the twelfth capacitor and the first voltage divider circuit, and the other end of the seventeenth resistor is connected to the inverting input terminal of the comparator and one end of the sixteenth resistor; The other end of the sixteenth resistor is connected to the DC bus DC-.

2. The dual-voltage reset circuit as described in claim 1, characterized in that, The third voltage divider circuit includes: an eighteenth resistor and a nineteenth resistor; One end of the eighteenth resistor is connected to the DC bus DC+, and the other end of the eighteenth resistor is connected to the non-inverting input terminal of the comparator and one end of the nineteenth resistor; The other end of the nineteenth resistor is connected to the DC bus DC-.

3. The dual-voltage reset circuit as described in claim 1, characterized in that, It also includes: a diode, the negative terminal of which is connected between one end of the twelfth capacitor and the second voltage divider circuit, and the positive terminal of which is connected to the DC bus DC-.

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