Portable constant-temperature welding table based on sodium ion battery

Abstract

The portable constant-temperature welding table comprises a host controller and a welding handle, the host controller comprises a control chip, a battery pack, a buck-boost power supply conversion circuit and a constant-temperature control circuit, and the battery pack is electrically connected with the constant-temperature control circuit through the buck-boost power supply conversion circuit. According to the portable constant-temperature welding table based on the sodium ion battery, the sodium ion battery with excellent low-temperature performance is adopted, the welding operation under the condition of no mains supply is met, the working efficiency is improved, long-time welding is maintained, and the portable constant-temperature welding table based on the sodium ion battery has the advantages of being simple in structure, convenient to use and high in practicability. And meanwhile, constant-temperature work of the welding handle can be achieved through the buck-boost power supply conversion circuit, the welding reliability is guaranteed, meanwhile, electric energy can be saved, and the practicability of the constant-temperature welding table is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric soldering irons, and in particular to a portable constant-temperature soldering station based on a sodium ion battery. Background Art

[0002] People who are specialized in electrical and electronic engineering are familiar with electric soldering irons. With the improvement of science and technology, there are various new types of constant temperature electric soldering irons. Among them, the 936 type constant temperature electric soldering iron is the most widely used because of its economical price and convenient operation. However, the constant temperature electric soldering iron is large in size and weight, which is not convenient to carry for outdoor work. Although there are rechargeable electric soldering iron products on the market, they all have a single battery built into the handle of the electric soldering iron. Therefore, the battery capacity is very small, the working time is very short, and it cannot meet the requirements of working in low temperature environments. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings, the utility model provides a portable constant temperature soldering station based on a sodium ion battery.

[0004] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0005] A portable constant temperature soldering station based on a sodium ion battery, comprising a host controller and a welding handle, the host controller comprising a control chip, a battery pack, a buck-boost power conversion circuit and a constant temperature control circuit, the battery pack is electrically connected to the constant temperature control circuit through the buck-boost power conversion circuit, the constant temperature control circuit is electrically connected to the welding handle, and the control chip is electrically connected to the buck-boost power conversion circuit and the constant temperature control circuit respectively;

[0006] The step-up / down power conversion circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, an inductor and a resistor. The series circuit formed by the first switch tube and the second switch tube is grounded through a resistor, and the series circuit formed by the fourth switch tube and the third switch tube is grounded through a resistor. One end of the inductor is respectively connected to the drain of the first switch tube and the source of the second switch tube, and the other end of the inductor is respectively connected to the drain of the fourth switch tube and the source of the third switch tube.

[0007] The four PWM terminals of the control chip are electrically connected to the gates of the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube respectively.

[0008] Preferably, the battery pack adopts a sodium ion battery, and the battery pack adopts a combination structure of 4 series and 2 parallels. The rated capacity of the battery pack is 74.4Wh, the charging cut-off voltage of the battery pack is DC16.0V, and the discharge cut-off voltage of the battery pack is DC8.0V. The sodium ion battery is a secondary battery that relies on the movement of sodium ions between the positive and negative electrodes of the battery to charge and discharge, and the working principle is similar to that of the lithium ion battery. The electrode material used in sodium ion batteries is mainly sodium salt, which is more abundant and cheaper than lithium salt. Since sodium ions are larger than lithium ions, sodium ion batteries are a cost-effective alternative when weight and energy density are not required. The operating voltage range is DC2.0V~4.0V, and the discharge temperature range is -40℃~60℃.

[0009] Preferably, the constant temperature control circuit includes a temperature sensor and an operational amplifier. The temperature sensor is located inside the welding handle. The temperature sensor can collect the temperature of the welding handle in real time. The temperature signal collected by the temperature sensor is then connected to the signal input terminal of the control chip through a signal amplification circuit mainly composed of an operational amplifier, so that the temperature of the welding handle can be collected in real time.

[0010] Preferably, it also includes a shell, on which a knob is provided, and the knob is electrically connected to the host controller. The temperature adjustment operation of the knob is convenient, the interface is simple and easy to understand, and the working status can be mastered at all times.

[0011] Preferably, the shell is made of aluminum alloy profile. The aluminum alloy profile shell is strong and durable, has good heat dissipation performance, and the overall structure adopts a fully sealed design with a certain waterproof performance, which is suitable for welding operations in outdoor environments.

[0012] The beneficial effects of the utility model are as follows: the portable constant temperature soldering station based on sodium ion batteries adopts sodium ion batteries with excellent low temperature performance, which can meet the welding operation without mains power, improve work efficiency, maintain long-term welding, and adapt to special outdoor working environments. At the same time, the constant temperature operation of the welding handle can be achieved through the step-up and step-down power supply conversion circuit, which ensures the welding reliability while saving electric energy, thereby improving the practicality of the constant temperature soldering station. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0014] Figure 1 It is a structural schematic diagram of the welding handle of the utility model;

[0015] Figure 2 It is the system principle diagram of the constant temperature soldering station of the utility model;

[0016] Figure 3 It is a circuit principle diagram of the boost-boost power conversion circuit of the utility model;

[0017] Figure 4 It is the switch tube waveform in the buck mode of the buck-boost power conversion circuit of the utility model;

[0018] Figure 5 It is the boost mode switch tube waveform of the boost-boost power conversion circuit of the utility model;

[0019] Figure 6 It is the battery pack charging curve of the utility model;

[0020] Figure 7 It is a working principle diagram of the constant temperature control circuit of the utility model;

[0021] Figure 8 It is a circuit diagram of the host controller of the utility model. DETAILED DESCRIPTION

[0022] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0023] A portable constant temperature soldering station based on sodium ion battery, Figure 2 As shown, it includes a host controller and a welding handle. The host controller includes a control chip, a battery pack, a buck-boost power conversion circuit and a constant temperature control circuit. The battery pack is electrically connected to the constant temperature control circuit through the buck-boost power conversion circuit, and the constant temperature control circuit is electrically connected to the welding handle. The control chip is electrically connected to the buck-boost power conversion circuit and the constant temperature control circuit respectively. The direct current input by the external power adapter passes through the buck-boost power conversion circuit to charge the sodium ion battery pack. The electric energy stored in the sodium ion battery pack is converted into a stable 18V direct current through the buck-boost conversion circuit to the intelligent constant temperature control circuit, and finally output to the welding handle for heating.

[0024] like Figure 1 As shown, the welding handle can realize the welding function. The welding handle of the 0936 constant temperature electric soldering iron includes a handle, a heating element, a welding head, etc. The heating element is inside the heating element, and the heating element is composed of a heating wire, a temperature sensor, and a ceramic shell. The design of the heating element inside the heating element belongs to an internal heating electric soldering iron. The heating element is the core component of the electric soldering iron and is also an aging-prone device. It is responsible for converting electrical energy into thermal energy.

[0025] The buck-boost power conversion circuit includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, an inductor and a resistor. The series circuit composed of the first switch tube and the second switch tube is grounded through a resistor, and the series circuit composed of the fourth switch tube and the third switch tube is grounded through a resistor. One end of the inductor is connected to the drain of the first switch tube and the source of the second switch tube, respectively, and the other end of the inductor is connected to the drain of the fourth switch tube and the source of the third switch tube, respectively; the four PWM terminals of the control chip are electrically connected to the gates of the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube, respectively. Among them, the buck-boost power conversion circuit adopts the latest bidirectional charging and discharging technology, uses the control chip to drive 4 MOSFETs through PWM signals to realize synchronous buck-boost function, has the characteristics of high conversion efficiency and wide external charging input voltage range, and is suitable for 12V / 24V vehicle power supply or power adapter power supply. The power conversion topology is basically divided into two categories, namely, boost circuit and buck circuit. The boost power circuit outputs high voltage after boosting the low voltage, and the buck circuit outputs low voltage after reducing the high voltage.

[0026] This synchronous buck-boost power conversion topology is as follows Figure 3 As shown, the first switch tube is switch tube A, the second switch tube is switch tube B, the third switch tube is switch tube C, and the fourth switch tube is switch tube D. It is a special power conversion circuit that combines boost and buck. When charging, the Vin terminal is the power input, the Vout terminal is the battery pack, the first switch tube and the second switch tube form a buck topology, and the third switch tube and the fourth switch tube form a boost topology. When discharging, the Vin terminal is the battery pack, and the Vout terminal is the power output. The fourth switch tube and the third switch tube form a buck topology, and the second switch tube and the first switch tube form a boost topology. The power inductor L in the middle is used for energy storage. When the switch tube is turned on, it charges and stores energy, and when the switch tube is turned off, it outputs electrical energy to the outside. The actual output electrical energy is a sawtooth wave, not the required direct current, so the output end also needs to be filtered by a filter capacitor.

[0027] The synchronous buck-boost power conversion topology has three working modes, namely buck, boost, and buck-boost. When the input voltage is higher than the output voltage, it is in boost mode; when the input voltage is greater than the output voltage, it is in buck mode; when the input voltage is equal to the output voltage, it is in buck-boost mode. The waveforms of the four switch tubes corresponding to the buck mode and the boost mode are also different.

[0028] When in buck mode, Figure 4 As shown, the first switch tube and the second switch tube are opposite PWM to form a synchronous buck topology, the third switch tube is low and does not work, the fourth switch tube is high and acts as an ideal diode, the waveform on the inductor is sawtooth chopping, and the duty cycle corresponds to the PWM waveform of the first switch tube.

[0029] When in the buck-boost transition mode, the four switches work simultaneously, but with slightly different timings. When buck-to-boost, the first and second switches are 120° ahead of the third and fourth switches. When boost-to-buck, the first and second switches lag 120° behind the third and fourth switches.

[0030] When in boost mode, Figure 5 As shown, the third switch tube and the fourth switch tube form a synchronous boost topology with opposite PWM, the second switch tube is low and does not work, the first switch tube is high and acts as an ideal diode, the waveform on the inductor is sawtooth chopping, and the duty cycle corresponds to the PWM waveform of the third switch tube.

[0031] Specifically, the battery pack adopts a sodium ion battery, and the battery pack adopts a combination structure of 4 series and 2 parallels. The rated capacity of the battery pack is 74.4Wh, the charging cut-off voltage of the battery pack is 16.0V of the fourth switch tube C, and the discharge cut-off voltage of the battery pack is 8.0V of the fourth switch tube C. The sodium ion battery is a secondary battery that relies on the movement of sodium ions between the positive and negative electrodes of the battery to charge and discharge, and the working principle is similar to that of the lithium ion battery. The electrode material used in sodium ion batteries is mainly sodium salt, which has more abundant reserves and lower prices than lithium salts. Since sodium ions are larger than lithium ions, sodium ion batteries are a cost-effective alternative when weight and energy density are not required. The operating voltage range is 2.0V to 4.0V of the fourth switch tube C, and the discharge temperature range is -40℃ to 60℃.

[0032] as follows Figure 6 As shown. This mode can extend the service life of the battery and protect the battery from damage. The first stage is trickle charging. When the voltage of the battery pack is lower than the fast charge threshold, the battery pack will be charged with a small current of 10%. The second stage is the constant current fast charge stage. As the voltage of the battery pack increases, the voltage of the battery pack reaches the fast charge threshold and the charging current is 100%. The third stage is constant voltage charging. As the voltage of the battery pack increases, the voltage of the battery pack reaches the full cut-off voltage, and the charging current begins to decrease. When the charging current decreases to the cut-off current threshold. At this time, the battery pack is fully charged and the charging process ends. When the battery pack voltage is left for a long time or discharged, the voltage of the battery pack will decrease. When it decreases to the recharge threshold voltage, that is, 98%, a new charging process will start.

[0033] Specifically, the constant temperature control circuit includes a temperature sensor and an operational amplifier. The temperature sensor is located inside the welding handle. The temperature sensor can collect the temperature of the welding handle in real time. The temperature signal collected by the temperature sensor is then connected to the signal input end of the control chip through a signal amplification circuit mainly composed of an operational amplifier, so that the temperature of the welding handle can be collected in real time.

[0034] Specifically, it also includes a shell, on which a knob is provided, and the knob is electrically connected to the host controller. The knob is convenient for temperature adjustment, the interface is simple and easy to understand, and the working status can be mastered at all times.

[0035] Specifically, the shell is made of aluminum alloy profile, which is strong and durable, has good heat dissipation performance, and the overall structure adopts a fully sealed design with certain waterproof performance, which is suitable for welding operations in outdoor environments.

[0036] as follows Figure 7 As shown in the figure, the working principle diagram of the constant temperature control circuit of the device uses a high-precision operational amplifier to amplify the signal of the temperature sensor inside the electric soldering iron, and then drives the switch tube F to control the output on and off after comparing it with the reference value, so as to realize the constant temperature heating of the electric soldering iron. The function of the switch tube E is to realize the function of an ideal diode and has the function of input reverse connection protection. The function of the current sensing resistor is to detect the input and output currents, realize the function of constant current charging and overcurrent protection. The power indication and status indication use light-emitting diodes for simple and easy understanding.

[0037] like Figure 8 As shown, the circuit part of the mainboard on the host controller of the device mainly includes a constant temperature control circuit, a power conversion circuit, a power detection circuit, etc., all designed on one mainboard, and the constant temperature control circuit is designed using an operational amplifier U2. The front-end U2A and R30, R45 form an amplifier follower circuit. The thermocouple inside the electric soldering iron converts the temperature into a voltage signal, which is transmitted to the third and second pins through resistors R28 and R29. U2A outputs the voltage signal from the first pin after operational amplification. The potentiometer R45 is used to adjust the amplification multiple, and the signal output from the first pin is fed back to the second pin through the resistor R30. This circuit realizes signal stabilization and amplification. The amplified signal is input to the fifth pin through the resistor R31. U2B plays a comparative role at this time. The reference voltage source set by the temperature knob potentiometer is given to the sixth pin. After passing through the comparator circuit, the control signal is output from the seventh pin to drive the opening and closing of the field effect tube Q5 to realize the control of the heating wire of the electric soldering iron.

[0038] The power detection circuit is implemented through a dedicated integrated circuit U3. The voltage divider network composed of resistors R33 to R37 divides the voltage value of the built-in battery pack into four parts, corresponding to four capacity segments. Then U3 indicates the remaining capacity by driving four light-emitting diodes.

[0039] The step-up / step-down power conversion circuit composed of integrated circuit U2, field effect tubes Q1~Q4, power inductor L1, etc. converts the DC power input from power socket X1 and charges the battery pack through connector P2, where voltage divider resistors R13 and R14 are used to set the battery full voltage, and resistor R8 is used to set the charging current. Integrated circuit U2 has a bidirectional charging and discharging function, and connector P3 is connected to the switch, and the voltage signal generated by the voltage divider network composed of resistors R23 and R24 is used to control the second pin of integrated circuit U2 through Q6 to realize the switching of charging and discharging.

[0040] The above is based on the disclosure of the utility model. Through the above description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A portable constant temperature soldering station based on sodium ion battery, characterized in that: It includes a host controller and a welding handle. The host controller includes a control chip, a battery pack, a buck-boost power conversion circuit and a constant temperature control circuit. The battery pack is electrically connected to the constant temperature control circuit through the buck-boost power conversion circuit. The constant temperature control circuit is electrically connected to the welding handle. The control chip is electrically connected to the buck-boost power conversion circuit and the constant temperature control circuit respectively. The step-up / down power conversion circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, an inductor and a resistor. The series circuit formed by the first switch tube and the second switch tube is grounded through a resistor, and the series circuit formed by the fourth switch tube and the third switch tube is grounded through a resistor. One end of the inductor is respectively connected to the drain of the first switch tube and the source of the second switch tube, and the other end of the inductor is respectively connected to the drain of the fourth switch tube and the source of the third switch tube. The four PWM terminals of the control chip are electrically connected to the gates of the first switch tube, the second switch tube, the third switch tube, and the fourth switch tube respectively.

2. The portable constant temperature soldering station based on sodium ion battery according to claim 1, characterized in that: The battery pack adopts sodium ion batteries, and the battery pack adopts a combination structure of 4 series and 2 parallels. The rated capacity of the battery pack is 74.4Wh, the charging cut-off voltage of the battery pack is DC16.0V, and the discharging cut-off voltage of the battery pack is DC8.0V.

3. The portable constant temperature soldering station based on sodium ion battery according to claim 1, characterized in that: The constant temperature control circuit includes a temperature sensor and an operational amplifier. The temperature sensor is located inside the welding handle. The temperature sensor is electrically connected to the signal input end of the control chip through a signal amplification circuit mainly composed of an operational amplifier.

4. The portable constant temperature soldering station based on sodium ion battery according to claim 1, characterized in that: The utility model also comprises a shell, on which a knob is arranged, and the knob is electrically connected to the host controller.

5. The portable constant temperature soldering station based on sodium ion battery according to claim 4, characterized in that: The shell is made of aluminum alloy profile.

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