A rechargeable lithium battery electric soldering iron device with temperature adjustment, temperature control and constant temperature

Abstract

The present application discloses a rechargeable lithium battery soldering iron device with temperature control and constant temperature. The device is designed with a 32-bit single-chip microcomputer and an analog circuit, and monitors the temperature of the soldering iron with a built-in thermocouple in real time. It optimizes the technology based on the existing portable soldering iron and uses the built-in thermocouple of the soldering iron to perform real-time temperature detection. This can boost the voltage of a single lithium battery and control the output voltage to achieve temperature compensation. The constant temperature of the soldering iron head is output within the full voltage range of the lithium battery. The constant temperature control device is designed with a voltage stabilizing circuit module, which can achieve a stable supply voltage required by the single-chip microcomputer and the control system by drawing power from the lithium battery. This can achieve continuous power supply to the remaining modules, and the output power supply can achieve a stable supply voltage required by the single-chip microcomputer and the control system, and can work at a minimum of 3V to achieve the operation of a single lithium battery. The voltage stabilizing circuit module is the key design circuit of this design, which aims to stabilize the voltage required by the output circuit.

Description

Technical Field

[0001] The present application relates to the technical field of circuit application design, and in particular to a rechargeable lithium battery electric soldering iron device with temperature adjustment, temperature control and constant temperature. Background Art

[0002] Electric soldering iron is an essential tool for electronic production and electrical appliance maintenance. Its main purpose is to solder components and wires. According to the mechanical structure, it can be divided into internal heating electric soldering iron and external heating electric soldering iron. According to the function, it can be divided into non-desoldering electric soldering iron and desoldering electric soldering iron. According to different uses, it can be divided into high-power electric soldering iron and low-power electric soldering iron. The soldering iron part of the electric soldering iron is the key working part, and a control circuit is designed to set the temperature.

[0003] In the existing market, most portable soldering irons are controlled by ordinary buck-boost circuits or simple switches. They have a short service life and require manual control of the conduction time or matching of the output power. Therefore, there are many technical defects such as using the heat capacity of the soldering iron tip to solder the solder joints and slow temperature recovery. Summary of the invention

[0004] The main purpose of the present application is to provide a rechargeable lithium battery electric soldering iron device with temperature adjustment, temperature control and constant temperature to solve the current problems.

[0005] In order to achieve the above objectives, this application provides the following technologies:

[0006] A rechargeable lithium battery electric soldering iron device with temperature adjustment, temperature control and constant temperature, comprising:

[0007] Power supply module: its purpose is to provide initial power to serve the control circuit;

[0008] Voltage stabilization circuit module: its purpose is to achieve a stable supply voltage required by the microcontroller and control system by drawing power from the lithium battery;

[0009] Boost circuit module: Its purpose is to increase the voltage of the lithium battery to the rated voltage of the soldering iron tip;

[0010] Control circuit module: Its purpose is to control whether the current signal is on or off, control the effective value of the output power through PWM, and cooperate with the microcontroller to control the temperature;

[0011] Single chip microcomputer controller: Its purpose is to achieve control and setting, collect multiple voltage and current signals, and control and convert the output current and voltage parameters of the output circuit through internal algorithms, so that the soldering iron temperature is stable within the preset range, and is responsible for displaying the parameters on the OLED display;

[0012] Current detection module: Its purpose is to perform negative feedback control, measure the current passing through the soldering iron tip, estimate the overall power and display it on the screen;

[0013] Temperature detection module: Its purpose is to amplify the voltage signal of the soldering iron tip and convert it into a voltage signal that can be recognized by the microcontroller ADC. In combination with the current signal, it uses an internal algorithm to read the temperature and display it on the screen, and obtain and send a negative feedback control signal.

[0014] Screen driver module: Its purpose is to display the data of the microcontroller on the screen protection circuit through an external charge pump and IIC communication principle;

[0015] Among them, the power supply module is electrically connected to the voltage stabilizing circuit module, and the voltage stabilizing circuit module is electrically connected to the voltage boosting circuit module, the single-chip microcomputer controller, the current detection module, the temperature detection module and the screen driving module respectively; the voltage boosting circuit module is electrically connected to the temperature detection module, the current detection module and the single-chip microcomputer controller respectively; the temperature detection module and the current detection module are both electrically connected to the single-chip microcomputer controller; the single-chip microcomputer controller is electrically connected to the control circuit module, and the current detection module and the single-chip microcomputer controller are both electrically connected to the screen driving module.

[0016] The technical principle of the present invention is:

[0017] This technology uses the design of a single-chip computer and analog circuits to monitor the temperature of the built-in thermocouple electric soldering iron in real time; based on the technical optimization of existing portable electric soldering irons, the built-in thermocouple of the electric soldering iron is used for real-time temperature detection. This can boost the voltage of a single lithium battery and control the output voltage to achieve temperature compensation; the constant temperature of the electric soldering iron tip can be output within the full voltage range of the lithium battery.

[0018] This constant temperature control device is designed with a voltage stabilizing circuit module. By drawing power from the lithium battery, a stable supply voltage is achieved for the microcontroller and control system. This allows for continuous power supply to the remaining modules. The output power supply can achieve a stable supply voltage for the microcontroller and control system, and can operate at a minimum of 3V, achieving the operation of a single lithium battery. The voltage stabilizing circuit module is the key design circuit of this design, which aims to stabilize the voltage required by the output circuit.

[0019] In the power module that needs to be boosted, the voltage of the lithium battery is increased to the rated voltage of the soldering iron tip through the boost circuit module, so that the original voltage is fed back and boosted again. The control circuit module controls the switch of the current signal, controls the size of the output power effective value in the form of PWM, and cooperates with the microcontroller to control the temperature.

[0020] The single-chip microcomputer controller controls and converts the multi-channel voltage and current signals of the output circuit as well as the output current and voltage parameters through internal algorithms, so that the temperature of the soldering iron is stabilized within a certain range, and is responsible for displaying the parameters on the OLED display screen to achieve control and setting; the current detection module measures the current passing through the soldering iron tip, estimates the overall power and displays it on the screen, thereby performing negative feedback control; the temperature detection module amplifies the weak voltage signal of the soldering iron tip and converts it into a voltage signal that can be recognized by the single-chip microcomputer ADC, and cooperates with the current signal through internal algorithms to realize the temperature reading and display it on the screen, thereby obtaining and sending negative feedback control signals.

[0021] According to the platform discharge characteristics of lithium batteries, the heating power can be kept constant in the whole range. For welding points of various sizes and welding materials, the temperature can be automatically compensated to achieve constant temperature welding.

[0022] Compared with the prior art, this application can bring the following technical effects:

[0023] 1. The circuit design of this electric soldering iron, through the design of single-chip microcomputer and analog circuit, can realize the voltage boost of single lithium battery and control the output voltage level through real-time monitoring of the temperature of the built-in thermocouple electric soldering iron, so as to achieve temperature compensation; in the full voltage range of lithium battery, the constant temperature of the electric soldering iron tip can be output;

[0024] 2. This design is based on the technical optimization of the existing portable electric soldering iron. It uses the built-in thermocouple of the electric soldering iron to perform real-time temperature detection, which can achieve the effect of constant temperature of the electric soldering iron powered by lithium batteries and extend the use time of the portable lithium battery-powered soldering iron;

[0025] 3. This electric soldering iron device can maintain a constant temperature on the soldering iron for a long time. Due to the platform discharge characteristics of the lithium battery, it can maintain a constant heating power in the full range. For solder joints of various sizes and welding materials, it can automatically compensate for the temperature and achieve constant temperature welding, which is energy-saving and efficient, and significantly improves the user's use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0027] Figure 1 It is a schematic diagram of the device module structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the circuit structure of the power supply module of the present invention;

[0029] Figure 3It is a circuit structure schematic diagram of the voltage stabilizing circuit module of the present invention;

[0030] Figure 4 It is a schematic diagram of the circuit structure of the boost circuit module of the present invention;

[0031] Figure 5 It is a schematic diagram of the circuit structure of the single-chip microcomputer controller of the present invention;

[0032] Figure 6 Schematic diagram of the circuit structure of the control circuit module of the present invention;

[0033] Figure 7 It is a schematic diagram of the circuit structure of the current detection module of the present invention;

[0034] Figure 8 It is a schematic diagram of the circuit structure of the temperature detection module of the present invention;

[0035] Fig. 9 It is a circuit structure schematic diagram of the screen driving module of the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0039] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0040] In addition, the term "plurality" shall mean two or more.

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] Example 1

[0043] In the application of this embodiment, while the circuit in the attached figure is working, an auxiliary circuit can be loaded for support. For the power supply module, boost module, single-chip microcomputer or screen driver, etc., the designed application circuit can be debugged according to the usual electrical operation process in the industry under the permission of the original circuit design, such as the stable output of current and voltage signals, the plug-in circuit of the chip, etc., which can all be debugged. Among them, the electrical components in the attached figure can be directly connected and used in accordance with the circuit in the figure, and can be implemented using conventional industry technology without limitation.

[0044] As attached Figure 1 As shown,

[0045] A rechargeable lithium battery electric soldering iron device with temperature adjustment, temperature control and constant temperature, comprising:

[0046] Power supply module: its purpose is to provide 12V power supply to serve the control circuit;

[0047] Voltage stabilization circuit module: its purpose is to achieve a stable supply voltage required by the microcontroller and control system by drawing power from the lithium battery;

[0048] Boost circuit module: Its purpose is to increase the voltage of the lithium battery to the rated voltage of the soldering iron tip;

[0049] Control circuit module: Its purpose is to control whether the current signal is on or off, control the effective value of the output power through PWM, and cooperate with the microcontroller to control the temperature;

[0050] Single chip microcomputer controller: Its purpose is to collect multiple voltage and current signals, and through the internal algorithm, control and convert the output current and voltage parameters of the output circuit, so that the soldering iron temperature is stable within a certain range, and is responsible for displaying the parameters on the OLED display screen to achieve control and setting;

[0051] Current detection module: Its purpose is to measure the current passing through the soldering iron tip, estimate the overall power and display it on the screen, so as to perform negative feedback control;

[0052] Temperature detection module: Its purpose is to amplify the weak voltage signal of the soldering iron tip and convert it into a voltage signal that can be recognized by the microcontroller ADC. It cooperates with the current signal and uses the internal algorithm to read the temperature and display it on the screen, and obtain and send a negative feedback control signal.

[0053] Screen driver module: Its purpose is to display the data of the microcontroller on the screen protection circuit through an external charge pump and IIC communication principle;

[0054] Among them, the power supply module is electrically connected to the voltage stabilizing circuit module, and the voltage stabilizing circuit module is electrically connected to the voltage boosting circuit module, the single-chip microcomputer controller, the current detection module, the temperature detection module and the screen driving module respectively; the voltage boosting circuit module is electrically connected to the temperature detection module, the current detection module and the single-chip microcomputer controller respectively; the temperature detection module and the current detection module are both electrically connected to the single-chip microcomputer controller; the single-chip microcomputer controller is electrically connected to the control circuit module, and the current detection module and the single-chip microcomputer controller are both electrically connected to the screen driving module.

[0055] The technical principle of the present invention is:

[0056] In this embodiment, this technology uses the design of a 32-bit single-chip microcomputer and analog circuits to monitor the temperature of the built-in thermocouple electric soldering iron in real time; based on the technical optimization of the existing portable electric soldering iron, the built-in thermocouple of the electric soldering iron is used to perform real-time temperature detection. This can achieve the voltage boost of a single lithium battery and control the output voltage level to achieve temperature compensation; the constant temperature of the electric soldering iron tip is output within the full voltage range of the lithium battery.

[0057] This constant temperature control device is designed with a voltage stabilizing circuit module. By drawing power from the lithium battery, a stable supply voltage is achieved for the microcontroller and control system. This allows for continuous power supply to the remaining modules. The output power supply can achieve a stable supply voltage for the microcontroller and control system, and can operate at a minimum of 3V, achieving the operation of a single lithium battery. The voltage stabilizing circuit module is the key design circuit of this design, which aims to stabilize the voltage required by the output circuit.

[0058] In the power module that needs to be boosted, the voltage of the lithium battery is increased to the rated voltage of the soldering iron tip through the boost circuit module, so that the original voltage is fed back and boosted again. The control circuit module controls the switch of the current signal, controls the size of the output power effective value in the form of PWM, and cooperates with the microcontroller to control the temperature.

[0059] The single-chip microcomputer controller controls and converts the multi-channel voltage and current signals of the output circuit as well as the output current and voltage parameters through internal algorithms, so that the temperature of the soldering iron is stabilized within a certain range, and is responsible for displaying the parameters on the OLED display screen to achieve control and setting; the current detection module measures the current passing through the soldering iron tip, estimates the overall power and displays it on the screen, thereby performing negative feedback control; the temperature detection module amplifies the weak voltage signal of the soldering iron tip and converts it into a voltage signal that can be recognized by the single-chip microcomputer ADC, and cooperates with the current signal through internal algorithms to realize the temperature reading and display it on the screen, thereby obtaining and sending negative feedback control signals.

[0060] According to the platform discharge characteristics of lithium batteries, the heating power can be kept constant in the whole range. For welding points of various sizes and welding materials, the temperature can be automatically compensated to achieve constant temperature welding.

[0061] As attached Figure 2 As shown, the power supply module includes a 12V positive power supply, a resistor R11, a buck chip U4, a diode D3, a capacitor C32, an inductor L1 and a BAT output end. The output end of the 12V positive power supply is electrically connected to the input end of the resistor R11, the input end of the capacitor C32 and the output end of the diode D3. The output end of the resistor R11 is electrically connected to the fourth end of the buck chip U4; the input end of the inductor L1 is electrically connected to the first end of the buck chip U4, and the output end of the inductor L1 is electrically connected to the fifth end of the buck chip U4 and the input end of the diode D3; the fifth end of the buck chip U4 is electrically connected to the output end of the diode D3, and the first end of the buck chip U4 and the input end of the inductor L1 are electrically connected to the BAT output end.

[0062] The purpose of the power supply module is to provide 12V power to serve the control circuit. The buck chip U4 is a TD chip series. The input voltage is bucked by the buck chip U4, diode D3, capacitor C32 and inductor L1, and finally the required voltage after the buck is output at the BAT output end. In terms of external form, it is equivalent to charging and storing energy for a lithium battery. Among them, the data values ​​of each electrical component can be obtained according to experiments or calculations, and the existing models can be directly selected for combination and replacement, so they will not be repeated.

[0063] As attached Figure 3 As shown, the voltage stabilizing circuit module includes a BAT input terminal, a voltage stabilizing chip U3, a capacitor C7, a capacitor C8, a capacitor C9 and a VCC power supply output terminal. The BAT input terminal is electrically connected to the first terminal of the voltage stabilizing chip U3 and the input terminal of the capacitor C7, and the output terminal of the capacitor C7 is grounded; the fourth terminal of the voltage stabilizing chip U3 is electrically connected to the capacitor C9, and the output terminal of the capacitor C9 is grounded; the fifth terminal of the voltage stabilizing chip U3 is electrically connected to the input terminal of the capacitor C8 and the VCC power supply output terminal, and the output terminal of the capacitor C8 is grounded.

[0064] The voltage regulator chip U3 is of the R79193 series. The voltage regulator circuit module obtains power from the lithium battery to achieve a stable supply voltage required by the microcontroller and the control system, thereby achieving continuous power supply to the remaining modules. The output power supply can achieve a stable supply voltage required by the microcontroller and the control system, and can work at a minimum of 3V, achieving the operation of a single lithium battery. The VCC power supply output terminal can output the stabilized power supply, which can provide constant current power supply for the microcontroller controller, current detection module, temperature detection module, screen driver and other facilities.

[0065] As attached Figure 4 As shown, the boost circuit module includes a BAT input terminal, an inductor L2, a diode D4, a transistor Q1, a transistor Q2, a boost chip U6, a diode D5, and a resistor R24. The BAT input terminal, the inductor L2, the diode D4, the transistor Q2, and the eighth terminal of the boost chip U6 are electrically connected in sequence; the collector of the transistor Q1, the emitter of the transistor Q2, and the output terminal of the inductor L2 are all electrically connected to the sixth terminal of the boost chip U6; the fourth terminal of the boost chip U6 is electrically connected to the output terminal input terminal of the diode D5, and the first terminal is electrically connected to the output terminal of the diode D5. The fourth terminal of the boost chip U6 is also electrically connected to a 12V positive power supply; the third terminal of the boost chip U6 is electrically connected to the input terminal of the resistor R24, and the output terminal of the resistor R24 ​​is grounded.

[0066] The purpose of the boost chip U6 is to increase the voltage of the lithium battery to the rated voltage of the soldering iron tip. The boost chip U6 of the AO0406 series is used to control the circuit system and control the voltage connected to the BAT input terminal. The boost chip U6 is connected to the microcontroller controller, and under the control of the control signal of the microcontroller controller, the boosted voltage is adjusted to reach the rated voltage required by the soldering iron tip.

[0067] As attached Figure 5 As shown, the single-chip microcomputer controller includes a single-chip microcomputer chip U1, a single-chip microcomputer connector P1, a resistor R7, a resistor R10 and a capacitor C5. The first end of the single-chip microcomputer connector P1, the VDD and VDDA ends of the single-chip microcomputer chip U1 and the input end of the resistor R10 are all electrically connected to the VCC power supply output end; the second end and the third end of the single-chip microcomputer connector P1 are respectively electrically connected to the PA13 end and the PA14 end of the single-chip microcomputer chip U1, the output end of the resistor R10 is respectively electrically connected to the NRST end of the single-chip microcomputer chip U1 and the input end of the capacitor C5, and the output end of the capacitor C5 is grounded; the B00T0 end of the single-chip microcomputer chip U1 is electrically connected to the input end of the resistor R7, and the output end of the resistor R7 is grounded; the PWM1 end of the single-chip microcomputer chip U1 is electrically connected to the second end of the boost chip U6, and the EN2 end of the single-chip microcomputer chip U1 is electrically connected to the third end of the boost chip U6.

[0068] The single-chip microcomputer controller collects multiple voltage and current signals, and controls and converts the output current and voltage parameters of the output circuit through internal algorithms, so that the soldering iron temperature is stabilized within a certain range, and is responsible for displaying the parameters on the OLED display screen to achieve control and setting; the single-chip microcomputer chip U1 is installed on the single-chip microcomputer connector P1, and the single-chip microcomputer connector P1 is a commonly used Header4 model. The single-chip microcomputer chip U1 here selects the STM32 series and is powered by the VCC power output end of the voltage stabilizing circuit module. The PWM1 end of the single-chip microcomputer chip U1 is electrically connected to the second end of the boost chip U6, and the EN2 end of the single-chip microcomputer chip U1 is electrically connected to the third end of the boost chip U6, aiming to control and convert the output current and voltage parameters of the output circuit, so that the soldering iron temperature is stabilized within a certain range.

[0069] In the single-chip microcomputer control circuit, the PA2, PA1 and PF1 port signals of the single-chip microcomputer chip U1 are controlled by three SW-PB type switches respectively. The output ends of the three SW-PB type switches are SW1, SW2 and SW3 respectively. The three ports PA2, PA1 and PF1 can be connected to the corresponding SW1, SW2 and SW3 respectively.

[0070] As attached Figure 6As shown, the control circuit module includes a resistor R14, a resistor R15, a resistor R28 and a driving chip U5, the PWM3 terminal of the single-chip chip U1 is electrically connected to the input terminal of the resistor R14, the output terminal of the resistor R14 is electrically connected to the input terminal of the resistor R15 and the NG terminal of the driving chip U5, the output terminal of the resistor R15 is grounded, the PS terminal of the driving chip U5 is electrically connected to the input terminal of the resistor R28, and the output terminal of the resistor R28 is electrically connected to the ND terminal of the driving chip U5; the PD terminal of the driving chip U5 is jointly used as the control current signal output terminal IRONP.

[0071] The PWM3 terminal of the single-chip microcomputer chip U1 is electrically connected to the input terminal of the resistor R14. The single-chip microcomputer chip U1 controls the size of the effective value of the output power in the form of PWM, and cooperates with the control circuit module to control the temperature. The driver chip U5 is ADP3001A model. The output terminal of the resistor R14 of the control circuit module is electrically connected to the input terminal of the resistor R15 and the NG terminal of the driver chip U5. The output terminal of the resistor R15 is grounded. The PS terminal of the driver chip U5 is electrically connected to the input terminal of the resistor R28, and the output terminal of the resistor R28 is electrically connected to the ND terminal of the driver chip U5. Therefore, under the control of the single-chip microcomputer, the PD terminal of the output driver chip U5 is used as the control current signal output terminal IRONP. Finally, the driver chip U5 outputs the control current signal and sends it to the current detection module and the temperature detection module, so as to perform current and temperature detection to avoid overload or high temperature of the electric soldering iron.

[0072] As attached Figure 7 As shown, the current detection module includes a capacitor C3, a resistor R8, a diode D1, an op amp U2A, a resistor R5 and a capacitor C1, the VCC power supply output terminal is electrically connected to the in-phase input terminal of the op amp U2A, the output terminal of the op amp U2A is electrically connected to the input terminal of the resistor R5, the output terminal of the resistor R5 is electrically connected to the output terminal of the capacitor C1 and is also electrically connected to the TEMPR terminal of the single-chip microcomputer chip U1, and the output terminal of the capacitor C1 is grounded; the control current signal output terminal IRONP is electrically connected to the input terminal of the capacitor C3 and the input terminal of the resistor R8, the output terminal of the resistor R8 is electrically connected to the input terminal of the diode D1 and the third terminal of the op amp U2A, and the output terminal of the diode D1, the output terminal of the capacitor C3 and the inverting terminal of the op amp U2A are all grounded.

[0073] The current detection module uses the op amp U2A to adjust the current control signal output by the driver chip U5. The op amp U2A uses the LMV358MM / NOPB model. The op amp U2A measures the current passing through the soldering iron tip, estimates the overall power and displays it on the screen, thereby performing negative feedback control. The negative feedback data processed by the current detection module is output to the TEMPR terminal of the microcontroller chip U1, and at the same time, part of the soldering iron tip data is fed back and displayed on the screen driver.

[0074] As attached Figure 8 As shown, the temperature detection module includes a capacitor C4, a resistor R9, a diode D2, an op amp U2B, a resistor R6 and a capacitor C2, the VCC power supply output terminal is electrically connected to the in-phase input terminal of the op amp U2B, the output terminal of the op amp U2B is electrically connected to the input terminal of the resistor R6, the output terminal of the resistor R6 is electrically connected to the output terminal of the capacitor C2 and is also electrically connected to the CUR terminal of the single-chip microcomputer chip U1, and the output terminal of the capacitor C2 is grounded; the control current signal output terminal IRONP is electrically connected to the input terminal of the capacitor C4 and the input terminal of the resistor R9, the output terminal of the resistor R9 is electrically connected to the input terminal of the diode D2 and the fifth terminal of the op amp U2B, and the output terminal of the diode D2, the output terminal of the capacitor C4 and the inverting terminal of the op amp U2B are all grounded.

[0075] The temperature detection module uses the op amp U2B to control the current signal output by the driver chip U5. The op amp U2B uses the LMV358MM / NOPB model. The op amp U2B amplifies the weak voltage signal of the soldering iron tip and converts it into a voltage signal that can be recognized by the microcontroller ADC. It cooperates with the current signal and uses the internal algorithm to read the temperature and display it on the screen, and obtain and send a negative feedback control signal. The negative feedback data processed by the temperature detection module is output to the CUR terminal of the microcontroller chip U1, and the temperature data of the soldering iron tip is fed back and displayed on the screen driver.

[0076] As attached Fig. 9 As shown, the screen driving module includes a single-chip computer connector P3, a resistor R19, a resistor R20, a resistor R23, a diode D7 and a capacitor C19, the VCC power supply output end is electrically connected to the input end of the resistor R19, the input end of the resistor R20, the input end of the resistor R23 and the output end of the diode D7, the output end of the resistor R23, the input end of the diode D7 and the input end of the capacitor C19 are electrically connected to the ninth end of the single-chip computer connector P3, and the output end of the capacitor C19 is grounded; the SCL port and the SDA port of the single-chip computer chip U1 are electrically connected to the SCL port and the SDA port of the single-chip computer connector P3 respectively.

[0077] The screen driver module uses the VCC power supply of the voltage stabilizing circuit module for power supply. The SCL port and SDA port of the microcontroller chip U1 correspond to the SCL port and SDA port of the electrically connected microcontroller connector P3 respectively. Through an external charge pump and IIC communication principle, the data of the microcontroller is displayed on the protection circuit on the screen.

[0078] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rechargeable lithium battery electric soldering iron device with temperature control and constant temperature, characterized in that: include: Power supply module: its purpose is to provide initial power to serve the control circuit; Voltage stabilization circuit module: its purpose is to achieve a stable supply voltage required by the microcontroller and control system by drawing power from the lithium battery; Boost circuit module: Its purpose is to increase the voltage of the lithium battery to the rated voltage of the soldering iron tip; Control circuit module: Its purpose is to control whether the current signal is on or off, control the effective value of the output power through PWM, and cooperate with the microcontroller to control the temperature; Single chip microcomputer controller: Its purpose is to achieve control and setting, collect multiple voltage and current signals, and control and convert the output current and voltage parameters of the output circuit through internal algorithms, so that the soldering iron temperature is stable within the preset range, and the parameters are displayed on the OLED display; Current detection module: Its purpose is to perform negative feedback control, measure the current passing through the soldering iron tip, estimate the overall power and display it on the screen; Temperature detection module: Its purpose is to amplify the voltage signal of the soldering iron tip and convert it into a voltage signal that can be recognized by the microcontroller ADC. In combination with the current signal, the temperature can be read and displayed on the screen through the internal algorithm, and a negative feedback control signal can be obtained and issued. Screen driver module: Its purpose is to display the data of the microcontroller on the security circuit on the screen through an external charge pump and IIC communication principle; Among them, the power supply module is electrically connected to the voltage stabilizing circuit module, and the voltage stabilizing circuit module is electrically connected to the boost circuit module, the single-chip controller, the current detection module, the temperature detection module and the screen driving module respectively; the boost circuit module is electrically connected to the temperature detection module, the current detection module and the single-chip controller respectively; the temperature detection module and the current detection module are both electrically connected to the single-chip controller; the single-chip controller is electrically connected to the control circuit module, and the current detection module and the single-chip controller are both electrically connected to the screen driving module; The single-chip microcomputer controller comprises a single-chip microcomputer chip (U1), a single-chip microcomputer connector P1, a resistor R7, a resistor R10 and a capacitor C5, wherein a first end of the single-chip microcomputer connector P1, VDD and VDDA ends of the single-chip microcomputer chip (U1) and an input end of the resistor R10 are all electrically connected to a VCC power supply output end; a second end and a third end of the single-chip microcomputer connector P1 are respectively electrically connected to a PA13 end and a PA14 end of the single-chip microcomputer chip (U1); an output end of the resistor R10 is respectively electrically connected to an NRST end of the single-chip microcomputer chip (U1) and an input end of the capacitor C5, and an output end of the capacitor C5 is grounded; a B00T0 end of the single-chip microcomputer chip (U1) is electrically connected to an input end of the resistor R7, and an output end of the resistor R7 is grounded; a PWM1 end of the single-chip microcomputer chip (U1) is electrically connected to a second end of a boost chip (U6), and an EN2 end of the single-chip microcomputer chip (U1) is electrically connected to a third end of the boost chip (U6); Among them, the PA2, PA1 and PF1 port signals of the single-chip microcomputer chip U1 are controlled by three SW-PB type switches respectively. The output ends of the three SW-PB type switches are SW1, SW2 and SW3 respectively. The three ports PA2, PA1 and PF1 are connected to the corresponding SW1, SW2 and SW3 respectively.

2. A rechargeable lithium battery electric soldering iron device with temperature control and constant temperature as claimed in claim 1, characterized in that: The power supply module comprises a 12V positive power supply, a resistor R11, a buck chip (U4), a diode D3, a capacitor C32, an inductor L1 and a BAT output end. The output end of the 12V positive power supply is electrically connected to the input end of the resistor R11, the input end of the capacitor C32 and the output end of the diode D3. The output end of the resistor R11 is electrically connected to the fourth end of the buck chip (U4); the input end of the inductor L1 is electrically connected to the first end of the buck chip (U4), the output end of the inductor L1 is electrically connected to the fifth end of the buck chip (U4) and the input end of the diode D3; the fifth end of the buck chip (U4) is electrically connected to the output end of the diode D3, and the first end of the buck chip (U4) and the input end of the inductor L1 are electrically connected to the BAT output end.

3. A rechargeable lithium battery electric soldering iron device with temperature control and constant temperature as claimed in claim 1 or 2, characterized in that: The voltage stabilizing circuit module comprises a BAT input terminal, a voltage stabilizing chip (U3), a capacitor C7, a capacitor C8, a capacitor C9 and a VCC power supply output terminal, wherein the BAT input terminal is electrically connected to a first terminal of the voltage stabilizing chip (U3) and an input terminal of the capacitor C7, and the output terminal of the capacitor C7 is grounded; a fourth terminal of the voltage stabilizing chip (U3) is electrically connected to the capacitor C9, and the output terminal of the capacitor C9 is grounded; a fifth terminal of the voltage stabilizing chip (U3) is electrically connected to an input terminal of the capacitor C8 and a VCC power supply output terminal, and the output terminal of the capacitor C8 is grounded.

4. A rechargeable lithium battery electric soldering iron device with temperature control and constant temperature as claimed in claim 3, characterized in that: The boost circuit module comprises a BAT input terminal, an inductor L2, a diode D4, a transistor Q1, a transistor Q2, a boost chip (U6), a diode D5, and a resistor R24. The BAT input terminal, the inductor L2, the diode D4, the transistor Q2, and the eighth terminal of the boost chip (U6) are electrically connected in sequence; the collector of the transistor Q1, the emitter of the transistor Q2, and the output terminal of the inductor L2 are all electrically connected to the sixth terminal of the boost chip (U6); the fourth terminal of the boost chip (U6) is electrically connected to the output terminal input terminal of the diode D5, and the first terminal is electrically connected to the output terminal of the diode D5. The fourth terminal of the boost chip (U6) is also electrically connected to a 12V positive power supply; the third terminal of the boost chip (U6) is electrically connected to the input terminal of the resistor R24, and the output terminal of the resistor R24 ​​is grounded.

5. A rechargeable lithium battery electric soldering iron device with temperature control and constant temperature as claimed in claim 1, characterized in that: The control circuit module comprises a resistor R14, a resistor R15, a resistor R28 and a driving chip (U5); a PWM3 terminal of the single-chip microcomputer chip (U1) is electrically connected to an input terminal of the resistor R14; an output terminal of the resistor R14 is electrically connected to an input terminal of the resistor R15 and an NG terminal of the driving chip (U5); an output terminal of the resistor R15 is grounded; a PS terminal of the driving chip (U5) is electrically connected to an input terminal of the resistor R28; an output terminal of the resistor R28 is electrically connected to an ND terminal of the driving chip (U5); and a PD terminal of the driving chip (U5) is used together as a control current signal output terminal (IRONP).

6. A rechargeable lithium battery electric soldering iron device with temperature control and constant temperature as claimed in claim 5, characterized in that: The current detection module comprises a capacitor C3, a resistor R8, a diode D1, an operational amplifier U2A, a resistor R5 and a capacitor C1, a VCC power supply output terminal is electrically connected to the in-phase input terminal of the operational amplifier U2A, an output terminal of the operational amplifier U2A is electrically connected to the input terminal of the resistor R5, an output terminal of the resistor R5 is electrically connected to the output terminal of the capacitor C1 and is also electrically connected to the TEMPR terminal of the single-chip microcomputer chip (U1), and an output terminal of the capacitor C1 is grounded; a control current signal output terminal (IRONP) is electrically connected to the input terminal of the capacitor C3 and the input terminal of the resistor R8, an output terminal of the resistor R8 is electrically connected to the input terminal of the diode D1 and a third terminal of the operational amplifier U2A, and an output terminal of the diode D1, an output terminal of the capacitor C3 and an inverting terminal of the operational amplifier U2A are all grounded.

7. A rechargeable lithium battery electric soldering iron device with temperature control and constant temperature as claimed in claim 6, characterized in that: The temperature detection module comprises a capacitor C4, a resistor R9, a diode D2, an operational amplifier U2B, a resistor R6 and a capacitor C2, a VCC power supply output end is electrically connected to a non-inverting input end of the operational amplifier U2B, an output end of the operational amplifier U2B is electrically connected to an input end of the resistor R6, an output end of the resistor R6 is electrically connected to an output end of the capacitor C2 and is also electrically connected to a CUR end of a single-chip microcomputer chip (U1), and an output end of the capacitor C2 is grounded; a control current signal output end (IRONP) is electrically connected to an input end of the capacitor C4 and an input end of the resistor R9, an output end of the resistor R9 is electrically connected to an input end of the diode D2 and a fifth end of the operational amplifier U2B, and an output end of the diode D2, an output end of the capacitor C4 and an inverting end of the operational amplifier U2B are all grounded.

8. A rechargeable lithium battery electric soldering iron device with temperature control and constant temperature as claimed in claim 7, characterized in that: The screen driving module includes a single-chip computer connector P3, a resistor R19, a resistor R20, a resistor R23, a diode D7 and a capacitor C19; a VCC power supply output terminal is electrically connected to an input terminal of the resistor R19, an input terminal of the resistor R20, an input terminal of the resistor R23 and an output terminal of the diode D7; an output terminal of the resistor R23, an input terminal of the diode D7 and an input terminal of the capacitor C19 are electrically connected to a ninth terminal of the single-chip computer connector P3; an output terminal of the capacitor C19 is grounded; an SCL port and an SDA port of the single-chip computer chip (U1) are electrically connected to an SCL port and an SDA port of the single-chip computer connector P3 respectively.

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