An energy storage welding circuit

Abstract

The utility model discloses a kind of energy storage welding circuits, including three-phase voltage increasing circuit module, with the rectifier circuit module of three-phase voltage increasing circuit module electricity connection, capacitor group discharge circuit module, with the welding transformer module of capacitor group discharge circuit module electricity connection, first resistance, second resistance, third resistance, fourth resistance, MOS transistor, pressure relief switch, energy storage capacitor, fifth resistance and diode.Through the above mode, the energy storage welding circuit disclosed in the utility model has multiple ways for capacitor discharge, and the on-off of MOS transistor can be controlled by single-chip microcomputer to automatically discharge capacitor voltage, so the safety is relatively high.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, specifically to an energy storage welding circuit. Background Technology

[0002] Energy storage welding is also a type of resistance welding. Its working principle is to use a small current to charge a capacitor, store energy through the capacitor, and stop charging after the energy storage is complete. The energy stored in the capacitor is discharged and welded through a welding transformer. After the welding is completed, the capacitor is charged again, and the cycle continues.

[0003] However, charging can only be completed before discharging, and discharging can only be completed before charging. Charging and discharging cannot be done simultaneously, but this process takes a long time, which is not conducive to improving efficiency. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the shortcomings of the existing technology, this utility model provides an energy storage welding circuit to solve the above-mentioned technical problems.

[0006] (II) Technical Solution

[0007] To solve the above-mentioned technical problems, this utility model provides a technical solution: an energy storage welding circuit, comprising a three-phase boost circuit module, a rectifier circuit module electrically connected to the three-phase boost circuit module, a capacitor bank discharge circuit module, and a welding transformer module electrically connected to the capacitor bank discharge circuit module, characterized in that it further comprises: a first resistor, one end of which is connected to the positive output terminal of the rectifier circuit module; a second resistor, one end of which is connected to the positive output terminal of the rectifier circuit module, and the other end of which is connected to the other end of the first resistor; a third resistor, one end of which is connected to the positive output terminal of the rectifier circuit module, and the other end of which is connected to the other end of the first resistor; a fourth resistor, one end of which is connected to the other end of the first resistor; and a MOS transistor, the first pin of which is connected to a microcontroller. The control terminal of the rectifier circuit module is connected, its second pin is connected to the other end of the fourth resistor, and its third pin is connected to the negative output terminal of the rectifier circuit module; a pressure relief switch is connected at one end to the other end of the fourth resistor and at the other end to the negative output terminal of the rectifier circuit module; an energy storage capacitor is connected at one end to the other end of the first resistor and at the other end to the negative output terminal of the rectifier circuit module; a fifth resistor is connected at one end to the other end of the first resistor; a diode is connected at its negative terminal to the other end of the fifth resistor and at its positive terminal to the negative output terminal of the rectifier circuit module; wherein, the input terminal of the capacitor bank discharge circuit module is connected to the other end of the first resistor, and the output terminal of the capacitor bank discharge circuit module is connected to the positive terminal of the diode.

[0008] Furthermore, the MOS transistor is an NMOS transistor, wherein the first pin of the MOS transistor is the gate of the NMOS transistor, the second pin of the MOS transistor is the source of the NMOS transistor, and the third pin of the MOS transistor is the drain of the NMOS transistor.

[0009] Furthermore, the pressure relief switch is a manual switch.

[0010] Furthermore, the other end of the second resistor is connected to the other end of the first resistor via a first manual control switch, and the other end of the third resistor is connected to the other end of the first resistor via a second manual control switch.

[0011] (III) Beneficial Effects

[0012] Compared with existing technologies, this utility model provides an energy storage welding circuit with the following advantages: The energy storage welding circuit disclosed in this utility model includes a three-phase boost circuit module, a rectifier circuit module electrically connected to the three-phase boost circuit module, a capacitor bank discharge circuit module, a welding transformer module electrically connected to the capacitor bank discharge circuit module, a first resistor, a second resistor, a third resistor, a fourth resistor, a MOS transistor, a voltage relief switch, an energy storage capacitor, a fifth resistor, and a diode. Through the above method, the energy storage welding circuit disclosed in this utility model has multiple methods for capacitor discharge. The capacitor voltage can be automatically discharged by controlling the on / off state of the MOS transistor through a microcontroller, resulting in relatively high safety. Alternatively, the capacitor voltage can be discharged manually by controlling the on / off state of the voltage relief switch, which improves working efficiency and flexibility. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the first embodiment of the energy storage welding circuit of this utility model;

[0014] Figure 2 This is a schematic diagram of the second embodiment of the energy storage welding circuit of this utility model. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1As shown, the present invention provides an energy storage welding circuit, including a three-phase boost circuit module 10, a rectifier circuit module 11 electrically connected to the three-phase boost circuit module 10, a capacitor bank discharge circuit module 12, a welding transformer module 13 electrically connected to the capacitor bank discharge circuit module 12, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a MOS transistor Q, a pressure relief switch T, an energy storage capacitor C1, a fifth resistor R5, and a diode D.

[0017] It should be understood that the three-phase boost circuit module 10 of this embodiment can boost the three-phase 380V AC mains power to three-phase 750V, while the rectifier circuit module 11 is used to rectify the boosted 750V three-phase AC power into DC power.

[0018] One end of the first resistor R1 is connected to the positive output terminal of the rectifier circuit module 11.

[0019] One end of the second resistor R2 is connected to the positive output terminal of the rectifier circuit module 11, and the other end of the second resistor R2 is connected to the other end of the first resistor R1.

[0020] One end of the third resistor R3 is connected to the positive output terminal of the rectifier circuit module 11, and the other end of the third resistor R3 is connected to the other end of the first resistor R1.

[0021] It should be understood that the first resistor R1, the second resistor R2, and the third resistor R3 in this embodiment serve as a charging current limiting module, which limits the charging current through the current limiting resistor.

[0022] One end of the fourth resistor R4 is connected to the other end of the first resistor R1.

[0023] The first pin of the MOS transistor Q is connected to the control terminal 14 of the microcontroller, the second pin of the MOS transistor Q is connected to the other end of the fourth resistor R4, and the third pin of the MOS transistor Q is connected to the negative output terminal of the rectifier circuit module 11.

[0024] In this embodiment, the MOS transistor Q is an NMOS transistor, wherein the first pin of the MOS transistor Q is the gate of the NMOS transistor, the second pin of the MOS transistor Q is the source of the NMOS transistor, and the third pin of the MOS transistor Q is the drain of the NMOS transistor.

[0025] One end of the pressure relief switch T is connected to the other end of the fourth resistor R4, and the other end of the pressure relief switch T is connected to the negative output terminal of the rectifier circuit module 11.

[0026] Preferably, the pressure relief switch T is a manual switch.

[0027] It should be understood that in this embodiment, the fourth resistor R4, MOS transistor Q, and voltage relief switch T serve as a capacitor voltage discharge module. One method is to actively discharge the voltage of capacitor C1 through MOS transistor Q to adjust it to a suitable set voltage; the second method is to manually close the voltage relief switch T to de-energize capacitor C1 and discharge the voltage.

[0028] One end of the energy storage capacitor C1 is connected to the other end of the first resistor R1, and the other end of the energy storage capacitor C1 is connected to the negative output terminal of the rectifier circuit module 11.

[0029] It should be understood that capacitor C1, as a capacitor energy storage module, stores electrical energy.

[0030] One end of the fifth resistor R5 is connected to the other end of the first resistor R1.

[0031] The negative terminal of diode D is connected to the other end of the fifth resistor R5, and the positive terminal of diode D is connected to the negative output terminal of rectifier circuit module 11.

[0032] It should be understood that the fifth resistor R5 and diode D in this embodiment serve as a freewheeling circuit module, providing freewheeling current to the primary winding of the welding transformer when the voltage of capacitor C1 drops to 0, and can also serve as a reverse circuit for discharging capacitor C1.

[0033] In this embodiment, the input terminal of the capacitor bank discharge circuit module 12 is connected to the other end of the first resistor R1, and the output terminal of the capacitor bank discharge circuit module 12 is connected to the positive terminal of the diode D.

[0034] It should be understood that the capacitor bank discharge circuit module 12 is an H-bridge topology and is composed of thyristors, but the same function can also be achieved using IGBTs, silicon carbide, etc., to discharge capacitor C1.

[0035] The welding transformer module 13 is used to discharge capacitor C1 to store energy in the primary winding of the transformer, and then transfer the energy to the secondary winding to achieve welding.

[0036] Furthermore, in another embodiment, such as Figure 2 As shown, the other end of the second resistor R2 is connected to the other end of the first resistor R1 through the first manual control switch K1, and the other end of the third resistor R3 is connected to the other end of the first resistor R1 through the second manual control switch K2, so that the charging current needs to be changed by closing the first manual control switch K1 and / or the second manual control switch K2.

[0037] It is worth noting that the three-phase boost circuit module 10, rectifier circuit module 11, capacitor bank discharge circuit module 12 and welding transformer module 13 in this embodiment can be implemented using products in the prior art, and their principles and structures will not be described in detail here.

[0038] Specific working principle:

[0039] The three-phase boost circuit module 10 boosts the three-phase 380V to 750V, and then the rectifier circuit module 11 rectifies it. The capacitor C1 is charged by the first resistor R1, the second resistor R2 and the third resistor R3 with current limiting.

[0040] Capacitor C1 discharges through capacitor bank discharge circuit module 12 to welding transformer module 13. The primary current of the welding transformer module 13 first rises and then falls. When capacitor bank discharge circuit module 12 stops discharging, the thyristor of capacitor bank discharge circuit module 12 continues to conduct because the inductor current of welding transformer module 13 cannot change abruptly. The voltage of capacitor C1 continues to discharge, causing the voltage of capacitor C1 to continue to decrease. When the capacitor voltage drops to 0, the thyristor continues to conduct because the primary current of welding transformer module 13 has not yet dropped below the thyristor holding current. At this time, the primary current will flow into two paths: one is to reverse charge capacitor C1, so capacitor C1 will have a reverse voltage; the other is that, under the premise that capacitor C1 has a reverse voltage, the freewheeling diode D presents a forward bias voltage and conducts, so the primary current flows into the freewheeling circuit. When the primary current drops to 0, it can no longer charge capacitor C1 or freewheel. At this time, the reverse voltage of capacitor C1 will not continue to rise, but will discharge to the freewheeling circuit until the reverse voltage of capacitor C1 drops to 0V. This discharge process will be very slow.

[0041] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover 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. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy storage welding circuit, comprising a three-phase boost circuit module, a rectifier circuit module electrically connected to the three-phase boost circuit module, a capacitor bank discharge circuit module, and a welding transformer module electrically connected to the capacitor bank discharge circuit module, characterized in that, Also includes: The first resistor has one end connected to the positive output terminal of the rectifier circuit module; The second resistor has one end connected to the positive output terminal of the rectifier circuit module, and the other end connected to the other end of the first resistor. The third resistor has one end connected to the positive output terminal of the rectifier circuit module and the other end connected to the other end of the first resistor. The fourth resistor has one end connected to the other end of the first resistor; The MOS transistor has its first pin connected to the control terminal of the microcontroller, its second pin connected to the other end of the fourth resistor, and its third pin connected to the negative output terminal of the rectifier circuit module. A pressure relief switch, one end of which is connected to the other end of the fourth resistor, and the other end of which is connected to the negative output terminal of the rectifier circuit module; An energy storage capacitor, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the negative output terminal of the rectifier circuit module; The fifth resistor has one end connected to the other end of the first resistor; The diode has its negative terminal connected to the other end of the fifth resistor, and its positive terminal connected to the negative output terminal of the rectifier circuit module. The input terminal of the capacitor bank discharge circuit module is connected to the other end of the first resistor, and the output terminal of the capacitor bank discharge circuit module is connected to the positive terminal of the diode.

2. The energy storage welding circuit according to claim 1, characterized in that, The MOS transistor is an NMOS transistor, wherein the first pin of the MOS transistor is the gate of the NMOS transistor, the second pin of the MOS transistor is the source of the NMOS transistor, and the third pin of the MOS transistor is the drain of the NMOS transistor.

3. The energy storage welding circuit according to claim 1, characterized in that, The pressure relief switch is a manual switch.

4. The energy storage welding circuit according to claim 1, characterized in that, The other end of the second resistor is connected to the other end of the first resistor via a first manual control switch, and the other end of the third resistor is connected to the other end of the first resistor via a second manual control switch.

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