Lithium battery welding gun control circuit
By designing a control circuit for a lithium battery welding torch, the problems of large power detection errors and overheating in lithium battery management were solved, achieving accurate and safe power display, preventing battery over-discharge and overheating, and the delayed heating design avoids burns, thus improving the safety and lifespan of the lithium battery welding torch.
Patent Information
- Application Number
- CN202520313449.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-02-26
AI Technical Summary
In lithium battery management, the defects of lithium battery management include large power detection errors. The traditional voltage method has an error of up to 20%, which leads to the remaining power display not matching the actual capacity, the risk of battery over-discharge, and the temperature of MOSFETs and inductors exceeding 85°C during continuous operation, which can easily cause overheating problems and affect their lifespan.
A lithium battery welding gun control circuit was designed, including a control module, a digital tube display module, a voltage stabilization module, a heating wire heating module, a voltage detection module, a charging management module, a white light illumination module, and a temperature detection module. Through the connection of pins and resistors, voltage stabilization, temperature monitoring and protection are achieved to prevent overheating. A delayed heating design is adopted to avoid burns. The digital tube displays the power data.
It achieves accurate power display, prevents battery over-discharge and overheating, and features a delayed heating design to avoid burns, thus improving the safety and lifespan of the lithium battery welding torch.
Smart Images
Figure CN223916886U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a welding torch control circuit technical field, especially in kind of lithium battery welding torch control circuit. BACKGROUND
[0002] Lithium battery welding torch lithium battery management defect electric quantity detection error is big, and the traditional voltage method detects electric quantity error and reaches 20%, leads to the remaining electric quantity display mismatch actual capacity. Battery overdischarge risk, MOS tube and inductance temperature exceeds 85 DEG C when continuously working, and overheat problem is easy to produce, influence life. UTILITY MODEL CONTENTS
[0003] The utility model discloses a lithium battery welding torch control circuit to solve the above problems.
[0004] In order to achieve the above object, the utility model provides the following technical scheme: a lithium battery welding torch control circuit, including control module, control module inserts nixie tube display module and voltage stabilizing module, the pin 11-17 of the chip U1 of control module inserts the chip DL1 of nixie tube display module, the pin 3 of control module inserts the parallel interface connection of switch KS and transistor Q7 grid after diode D5 3 voltage stabilizing module, the pin 19 of control module in series resistance R28 inserts the parallel interface of triode Q9 base, resistance R26, resistance R30 and transistor Q8 drain, and the other end of resistance R30 inserts power supply circuit D / C;
[0005] The source of transistor Q7, triode Q9 emitter and switch KS insert the voltage stabilizing circuit of resistance R21, chip U2, resistance R20 and resistance R24.
[0006] Further, control module and electric heating wire heating module, voltage detection module, charge management module, white light illumination module and temperature detection module are electrically connected, the charge management module and voltage detection module and electric heating wire heating module are sequentially electrically connected, voltage detection module transmits voltage data to control module through VOT port, and charge management module transmits current data to control module through VT+ and VT- port.
[0007] Further, the pin 1 and 20 of chip U1 insert filter capacitor C4, filter capacitor C10 and filter capacitor C11.
[0008] Further, the chip TP1 of the charge management module accesses the current signal acquisition module composed of the resistance R4, the resistance R8, the resistance R1, the resistance R5 and the resistance R7, the parallel interface of the resistance R4 and the resistance R8 accesses the VT+ port of the chip U1, the parallel interface of the resistance R5 and the resistance R7 accesses the VT- port of the chip U1, the resistance R9 connected with the current signal acquisition module accesses the drain of the transistor Q5, the gate of the transistor Q5 accesses the PWM3 pin of the chip U1.
[0009] Further, the resistance R3 of the voltage detection module accesses the drain of the transistor Q2, the gate of the transistor Q2 accesses the OUTEN end of the chip U1 in series with the resistance R11, and the source of the transistor Q2 accesses the resistance R10 and the VOT end of the chip U1.
[0010] Further, the gate of the transistor Q3 and the transistor Q4 of the electric heating wire heating module accesses the parallel interface of the resistance R6 and the resistance R12, the other end of the resistance R6 accesses the PWM1 end of the chip U1, the source of the transistor Q3 and the transistor Q4 accesses the parallel interface of the resistance R16 and the resistance R18, the other end of the resistance R1 accesses the OCP end of the chip U1, and the drain of the transistor Q3 and the transistor Q4 accesses the positive and negative poles of the electric heating wire.
[0011] Further, the gate of the transistor Q10 and the resistance R32 of the white light illumination module access the LW end of the chip U1, and the drain of the transistor Q10 accesses the voltage B+ in series with the light emitting diode LD1 and the resistance R19.
[0012] Further, the resistance R31 and the resistance NTC of the temperature detection module access the pin 10 of the chip U1 in parallel.
[0013] The technical effects and advantages of the utility model are as follows:
[0014] After the button KS of the voltage stabilization module is turned on, the control module controls the transistor Q7 to open the power supply circuit through the signal OUTEN, the resistance R30 replaces the OUTEN signal to open the power supply circuit during charging, the resistance R21, the transistor Q6, the chip U2, the resistance R20 and the resistance R24 form a voltage stabilization circuit to maintain a constant 5V, and the resistance RL1 and the diode D1 protect the power supply circuit from overloading.
[0015] The nixie tube display module can be used for directly displaying the power data, RN1 and RN2 are used as current limiting resistors, the program port is scanned to transmit the content to be displayed.
[0016] The control module sends a signal PWM1 to turn transistors Q3 and Q4 on and off to turn the heating on and off. The control module controls the temperature of the heating wire through the duty cycle of PWM1 software. Resistors R16 and R18 form current detection data, which is transmitted to the MCU through the OCP port. In case of overcurrent, the PWM1 port is turned off to cut off transistors Q3 and Q4 for protection.
[0017] 4. The resistors R31 and NTC of the temperature detection module are connected in parallel to pin 10 of chip U1. Resistors R31 and NTC collect temperature signals and send them to the control module. When overheating occurs, PWM1 is turned off to cut off transistors Q3 and Q4 for protection. When the circuit board temperature is greater than or equal to 90°C, it will stop working to prevent damage to the circuit board or burns to people. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the control module, digital tube display module, and temperature detection module of this utility model;
[0019] Figure 2 This is a schematic diagram of the voltage stabilization module of this utility model;
[0020] Figure 3 This is a schematic diagram of the hot wire heating module, voltage detection module, and charging management module of this utility model;
[0021] Figure 4 This is a structural diagram of the white lamp lighting module of this utility model.
[0022] 1. Control module; 2. Digital tube display module; 3. Voltage stabilization module; 4. Heating wire module; 5. Voltage detection module; 6. Charging management module; 7. White lamp illumination module; 8. Temperature detection module. Detailed Implementation
[0023] 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.
[0024] Please see Figure 1A lithium battery welding torch control circuit includes a control module 1. The control module 1 is connected to a digital tube display module 2 and a voltage stabilization module 3. Pins 11-17 of the chip U1 of the control module 1 are connected to the chip DL1 of the digital tube display module 2. Pin 3 of the control module 1 is connected to the parallel interface of diode D5 of the voltage stabilization module 3, switch KS and gate of transistor Q7. Pin 19 of the control module 1 is connected in series with resistor R28 to the parallel interface of base of transistor Q9, resistor R26, resistor R30 and drain of transistor Q8. The other end of resistor R30 is connected to the power supply circuit D / C.
[0025] Please see Figure 2 When the button KS of voltage stabilization module 3 is turned on, control module 1 sends the OUTEN signal to control transistor Q7 to open the power supply circuit. When D / C and resistor R30 are charging, they replace the OUTEN signal to open the power supply circuit. Resistor R21, transistor Q6, chip U2, resistor R20, and resistor R24 form a voltage regulator circuit to maintain a constant 5V. Resistor RL1 and diode D1 protect the power supply circuit from overload.
[0026] The digital tube display module 2 can be used to directly display power data. RN1 and RN2 are used as current-limiting resistors, and the content to be displayed is transmitted through program port scanning.
[0027] The voltage regulator circuit consists of the source of transistor Q7, the emitter of transistor Q9, the switch KS connected to resistor R21, chip U2, resistor R20, and resistor R24.
[0028] The gate of transistor Q9 is connected to resistor 28, which is connected to the touch button module. The touch panel U3 of the touch button module is connected to the TK terminal of chip U1, and is adjusted by touch to prevent dust.
[0029] Please see Figure 3 The control module 1 is electrically connected to the heating wire heating module 4, the voltage detection module 5, the charging management module 6, the white lamp lighting module 7, and the temperature detection module 8. The charging management module 6 is electrically connected to the voltage detection module 5 and the heating wire heating module 4 in sequence. The voltage detection module 5 transmits voltage data to the control module 1 through the VOT port, and the charging management module 6 transmits current data to the control module 1 through the VT+ and VT- ports.
[0030] Please see Figure 1 The resistors R31 and NTC of the temperature detection module 8 are connected in parallel to pin 10 of the chip U1. The resistors R31 and NTC collect temperature signals and send data to the control module 1. When overheating occurs, PWM1 is turned off to cut off transistors Q3 and Q4 for protection. When the circuit board temperature is greater than or equal to 90°, it will stop working to prevent damage to the circuit board or burns to people.
[0031] Pins 1 and 20 of chip U1 are connected to filter capacitors C4, C10, and C11.
[0032] Please see Figure 3 The chip TP1 of the charging management module 6 is connected to the current signal acquisition module composed of resistors R4, R8, R1, R5 and R7. The parallel interface of resistors R4 and R8 is connected to the VT+ port of chip U1, and the parallel interface of resistors R5 and R7 is connected to the VT- port of chip U1. The resistor R9 connected to the current signal acquisition module is connected to the drain of transistor Q5, and the gate of transistor Q5 is connected to the PWM3 pin of chip U1.
[0033] During charging, the indicator "=D-" flashes. After 10 seconds, it enters energy-saving mode, dimming and reducing resolution. Clicking the button restores normal brightness, which dims again after 3 seconds. The charging indicator stops flashing when fully charged. The battery level displays 100%. If the battery voltage drops below 4.1V, it will automatically recharge in the background.
[0034] The current signal acquisition module transmits the signal to the control module 1 via VT+ and VT-. When the current is too high or the charging voltage is too high, the protection function is achieved by shutting down the transistor Q1 through the PWM3 port.
[0035] Please see Figure 3 The resistor R3 of the voltage detection module 5 is connected to the drain of transistor Q2, the gate of transistor Q2 is connected in series with resistor R11 to the OUTEN terminal of chip U1, and the source of transistor Q2 is connected to resistor R10 and the VOT terminal of chip U1.
[0036] Resistors R3 and R10, along with transistor Q2, form a voltage detection system. The data is transmitted to control module 1 via the VOT port. In case of undervoltage or overvoltage, transistors Q3 and Q4 are cut off for protection. Overvoltage protection is provided during charging. Charging is cut off if a charger with a voltage greater than 6V is mistakenly plugged in. The system displays "E3".
[0037] Please see Figure 3 The gates of transistors Q3 and Q4 in the heating wire heating module 4 are connected to the parallel interface of resistors R6 and R12. The other end of resistor R6 is connected to the PWM1 terminal of chip U1. The sources of transistors Q3 and Q4 are connected to the parallel interface of resistors R16 and R18. The other end of resistor R1 is connected to the OCP terminal of chip U1. The drains of transistors Q3 and Q4 are connected to the positive and negative terminals of the heating wire.
[0038] The signal PWM1 from control module 1 turns transistors Q3 and Q4 on and off to turn on and off the heating. Control module 1 controls the temperature of the heating wire through the duty cycle of PWM1 software. Resistors R16 and R18 form current detection data, which is transmitted to the MCU through the OCP port. In case of overcurrent, PWM1 port is turned off to cut off transistors Q3 and Q4 for protection.
[0039] Furthermore, the PWM1 signal emitted by control module 1 is delayed by 1 second. In the first second, the light illuminates but does not heat up, preventing accidental burns. This is in contrast to existing welding torches on the market that heat up rapidly after a switch is pressed, potentially causing burns to the user's hand. Even a slight delay in removing the hand can result in burns. The 1-second delay design prevents burns to the user.
[0040] Please see Figure 4 The gate of transistor Q10 in white lamp lighting module 7 and resistor R32 are connected to the LW terminal of chip U1. The drain of transistor Q10 is connected in series with light-emitting diode LD1 and resistor R19 to voltage B+. The signal LW of control module 1 controls the on / off state of transistor Q10, that is, turns white lamp LD1 on and off. When working, white lamp LD1 is constantly lit and turns off when not working.
[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A lithium battery welding torch control circuit, comprising a control module (1), characterized in that: The control module (1) is connected to the digital tube display module (2) and the voltage stabilization module (3). Pins 11-17 of the chip U1 of the control module (1) are connected to the chip DL1 of the digital tube display module (2). Pin 3 of the control module (1) is connected to the parallel interface of the diode D5 of the voltage stabilization module (3) and the switch KS and the gate of the transistor Q7. Pin 19 of the control module (1) is connected to the parallel interface of the base of the transistor Q9, resistor R26, resistor R30 and the drain of the transistor Q8, and the other end of resistor R30 is connected to the power supply circuit D / C. The voltage regulator circuit consists of the source of transistor Q7, the emitter of transistor Q9, the switch KS connected to resistor R21, chip U2, resistor R20, and resistor R24.
2. The lithium battery welding torch control circuit according to claim 1, characterized in that, The control module (1) is electrically connected to the heating wire heating module (4), voltage detection module (5), charging management module (6), white lamp lighting module (7) and temperature detection module (8). The charging management module (6) is electrically connected to the voltage detection module (5) and the heating wire heating module (4) in sequence. The voltage detection module (5) transmits voltage data to the control module (1) through the VOT port. The charging management module (6) transmits current data to the control module (1) through the VT+ and VT- ports.
3. The lithium battery welding torch control circuit according to claim 1, characterized in that, Pins 1 and 20 of the chip U1 are connected to filter capacitors C4, C10, and C11.
4. The lithium battery welding torch control circuit according to claim 2, characterized in that, The charging management module (6) has its chip TP1 connected to a current signal acquisition module composed of resistors R4, R8, R1, R5 and R7. The parallel interface of resistors R4 and R8 is connected to the VT+ port of chip U1, and the parallel interface of resistors R5 and R7 is connected to the VT- port of chip U1. The resistor R9 connected to the current signal acquisition module is connected to the drain of transistor Q5, and the gate of transistor Q5 is connected to the PWM3 pin of chip U1.
5. A lithium battery welding torch control circuit according to claim 2, characterized in that, The voltage detection module (5) has resistor R3 connected to the drain of transistor Q2, the gate of transistor Q2 connected in series with resistor R11 connected to the OUTEN terminal of chip U1, and the source of transistor Q2 connected to resistor R10 and the VOT terminal of chip U1.
6. A lithium battery welding torch control circuit according to claim 2, characterized in that, The gates of transistors Q3 and Q4 in the heating module (4) are connected to the parallel interface of resistors R6 and R12. The other end of resistor R6 is connected to the PWM1 terminal of chip U1. The sources of transistors Q3 and Q4 are connected to the parallel interface of resistors R16 and R18. The other end of resistor R1 is connected to the OCP terminal of chip U1. The drains of transistors Q3 and Q4 are connected to the positive and negative terminals of the heating wire.
7. A lithium battery welding torch control circuit according to claim 2, characterized in that, The gate of transistor Q10 and resistor R32 of the white lamp lighting module (7) are connected to the LW terminal of chip U1, and the drain of transistor Q10 is connected to the voltage B+ via a series connection of light-emitting diode LD1 and resistor R19.
8. A lithium battery welding torch control circuit according to claim 2, characterized in that, The resistor R31 and resistor NTC of the temperature detection module (8) are connected in parallel to pin 10 of chip U1.