Control circuit, soldering iron handle and soldering iron

Abstract

The utility model discloses a control circuit, a soldering iron handle and soldering iron, and relates to the technical field of electric soldering irons, the control circuit comprises a first switch circuit, the input end of the first switch circuit is electrically connected with the power supply input end, and the output end of the first switch circuit is electrically connected with the power supply output end; the input end of the second switching circuit is electrically connected with the power input end, the output end of the second switching circuit is electrically connected with the controlled end of the first switching circuit, and the second switching circuit is used for being switched on when the soldering iron handle is placed on the support and also used for being switched off when the soldering iron handle is far away from the support; the first end of the capacitive circuit is electrically connected with the output end of the second switching circuit and the controlled end of the first switching circuit; according to the utility model, the damage to components at the welding part caused by higher temperature due to overlong welding time is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electric soldering irons, in particular to a control circuit, a soldering iron handle and a soldering iron. Background Art

[0002] Soldering iron is an essential tool for electronic production and electrical appliance repair. Its main use is to weld machine components and wires. According to its structure, it can be divided into internal heating soldering iron and external heating soldering iron. According to its function, it can be divided into soldering iron and desoldering iron. According to its use, it can be divided into high-power soldering iron and low-power soldering iron.

[0003] Once the existing soldering iron is powered on, it will remain in a heating state. If the soldering time is not well controlled, the high temperature may damage the components at the soldering point. Utility Model Content

[0004] The main purpose of the utility model is to provide a control circuit, a soldering iron handle and a soldering iron, aiming to prevent the components at the soldering point from being damaged by high temperatures caused by long soldering time.

[0005] To achieve the above-mentioned object, the present invention proposes a control circuit, which is applied to a soldering iron handle. The soldering iron handle includes a power input terminal and a power output terminal. The power input terminal is connected to a power supply, and the power output terminal is connected to a power input terminal of the soldering iron tip. The control circuit includes:

[0006] a first switch circuit, wherein an input end of the first switch circuit is electrically connected to a power input end, and an output end of the first switch circuit is electrically connected to a power output end;

[0007] a second switch circuit, wherein an input end of the second switch circuit is electrically connected to the power input end, an output end of the second switch circuit is electrically connected to the controlled end of the first switch circuit, and the second switch circuit is configured to be turned on when the soldering iron handle is placed on the bracket, and to be turned off when the soldering iron handle is away from the bracket;

[0008] A capacitor circuit, wherein a first end of the capacitor circuit is electrically connected to the output end of the second switch circuit and the controlled end of the first switch circuit respectively.

[0009] In one embodiment, the first switching circuit includes:

[0010] a first switching tube, wherein an input end of the first switching tube is electrically connected to a power input end, and an output end of the first switching tube is electrically connected to a power output end;

[0011] A high-voltage conduction circuit, wherein a first end of the high-voltage conduction circuit is electrically connected to the output end of the first switch circuit, and a second end of the high-voltage conduction circuit is electrically connected to the controlled end of the first switch tube.

[0012] In one embodiment, the high voltage conduction circuit includes:

[0013] a first resistor, wherein a first end of the first resistor is connected to the output end of the second switch circuit, and a second end of the first resistor is connected to the input end of the capacitor circuit;

[0014] A bidirectional trigger diode, wherein the first end of the bidirectional trigger diode is electrically connected to the output end of the second switch circuit and the second end of the first resistor respectively, and the second end of the bidirectional trigger diode is electrically connected to the controlled end of the first switch tube.

[0015] In one embodiment, the second switching circuit includes:

[0016] A magnetic induction component, wherein a first end of the magnetic induction component is electrically connected to the power input end, and a second end of the magnetic induction component is electrically connected to the controlled end of the first switch circuit.

[0017] In one embodiment, the magnetic sensing component includes:

[0018] A magnetic flux tube, wherein a first end of the magnetic flux tube is electrically connected to the power input end, and a second end of the magnetic flux tube is electrically connected to the controlled end of the first switching circuit.

[0019] In one embodiment, the capacitive circuit includes:

[0020] A first capacitor, wherein a first end of the first capacitor is electrically connected to the output end of the second switch circuit and the controlled end of the first switch circuit respectively, and a second end of the first capacitor is electrically connected to the power supply output end.

[0021] In one embodiment, the control circuit further includes:

[0022] A filter circuit, wherein the input end of the filter circuit is electrically connected to the power input end, and the output end of the filter circuit is electrically connected to the power output end.

[0023] In one embodiment, the filtering circuit includes:

[0024] A first inductor and a second capacitor, wherein a first end of the first inductor is electrically connected to a power input end, and a second end of the first inductor is electrically connected to an input end of the second switching circuit and an input end of the first switching circuit respectively.

[0025] The utility model also provides a soldering iron handle, comprising a power input end, a power output end and any one of the control circuits described above.

[0026] The present invention further provides a soldering iron, comprising the above-mentioned soldering iron handle and a soldering iron tip, wherein the soldering iron tip is connected to the soldering iron handle.

[0027] The technical solution of the utility model includes a first switching circuit, a second switching circuit, and a capacitor circuit. The second switching circuit is configured to be turned on when the soldering iron handle is placed on a bracket, so that current from the power supply input terminal is transmitted to the first switching circuit, thereby controlling the first switching circuit to be turned on. The power output of the power supply is transmitted to the soldering iron tip via the first switching circuit. After receiving the power, the soldering iron tip begins to heat up. Current is also transmitted to the capacitor circuit to charge the capacitor circuit. When the soldering iron handle is removed from the bracket, the second switching circuit is disconnected, and the capacitor circuit continuously discharges to the controlled terminal of the first switching circuit, so that the first switching circuit remains on for a preset time. After the capacitor circuit has released the stored power, the first switching circuit is turned off, and the soldering iron tip stops heating. With such a setting, in actual application, when the temperature of the soldering iron tip reaches the preset temperature, the user moves the soldering iron away from the bracket to solder the components. Since the soldering iron tip can only be heated within the preset time after the soldering iron is removed from the bracket, the user can only solder the components within the preset time. After the preset time, the soldering iron needs to be placed on the bracket again to heat the soldering iron tip. In this way, the user can only solder the components within the preset time, thereby avoiding damage to the components at the welding point caused by long-term high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of a module according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of the present utility model.

[0031] Description of Figure Numbers:

[0032] 10. First switch circuit; 11. High-voltage conduction circuit; 20. Second switch circuit; 21. Magnetic induction component; 30. Capacitor circuit; 40. Filter circuit.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] Soldering iron is an essential tool for electronic production and electrical appliance repair. Its main use is to weld machine components and wires. According to its structure, it can be divided into internal heating soldering iron and external heating soldering iron. According to its function, it can be divided into soldering iron and desoldering iron. According to its use, it can be divided into high-power soldering iron and low-power soldering iron.

[0038] Once the existing soldering iron is powered on, it will remain in a heating state. If the soldering time is not well controlled, the high temperature may damage the components at the soldering point.

[0039] To this end, the utility model provides a control circuit, a soldering iron handle and a soldering iron, aiming to prevent the high temperature caused by long soldering time from damaging the components at the soldering point.

[0040] refer to Figure 1 In one embodiment of the present invention, a control circuit is applied to a soldering iron handle, wherein the soldering iron handle includes a power input terminal and a power output terminal, wherein the power input terminal is connected to a power supply, and the power output terminal is connected to a power input terminal of a soldering iron tip, and wherein the control circuit includes:

[0041] a first switch circuit 10, wherein an input terminal of the first switch circuit 10 is electrically connected to a power input terminal, and an output terminal of the first switch circuit 10 is electrically connected to a power output terminal;

[0042] a second switch circuit 20, wherein the input end of the second switch circuit 20 is electrically connected to the power input end, the output end of the second switch circuit 20 is electrically connected to the controlled end of the first switch circuit 10, and the second switch circuit 20 is configured to be turned on when the soldering iron handle is placed on the bracket, and also configured to be turned off when the soldering iron handle is away from the bracket;

[0043] The capacitor circuit 30 has a first end electrically connected to the output end of the second switch circuit 20 and the controlled end of the first switch circuit 10 respectively.

[0044] In this embodiment, the first switching circuit 10 can be implemented by at least one switching tube, such as a MOS tube, an IGBT tube, a thyristor, a triode, a power tube, etc., and / or by at least one switching device, such as a contactor, a circuit breaker and a relay.

[0045] In this embodiment, the second switch circuit 20 can optionally be implemented using a circuit consisting of a pressure sensor and a switch assembly. The pressure sensor is located at the portion of the soldering iron handle that is used to cooperate with the bracket. When the soldering iron is placed on the bracket, the pressure sensor, under pressure, sends an on signal to control the switch assembly to conduct. When the soldering iron is away from the bracket, the pressure sensor, under pressure, sends an off signal to control the switch assembly to conduct. When the soldering iron is away from the bracket, the pressure sensor, under pressure, is substantially zero, and sends an off signal to control the switch assembly to conduct. The second switch circuit 20 can also be implemented using a light sensor and a switch assembly. The light sensor is located at the portion of the soldering iron handle that is used to cooperate with the bracket. When the soldering iron is placed on the bracket, the light sensor is blocked. When the light received by the light sensor is zero, the light sensor generates an on signal to control the switch assembly to conduct. When the soldering iron is away from the bracket, the light sensor senses light and generates an off signal to control the switch circuit to conduct.

[0046] In this embodiment, the capacitor circuit 30 includes at least one capacitor, for example Figure 2 The first capacitor C1 in the capacitor circuit 30 is used to store the electric energy input from the power input terminal when the second switch circuit 20 is turned on, and is also used to release the stored electric energy when the second switch circuit 20 is turned off, thereby controlling the first switch circuit 10 to be turned on.

[0047] Specifically, the technical solution of the present invention includes a first switching circuit 10, a second switching circuit 20, and a capacitor circuit 30. The second switching circuit 20 is configured to be turned on when the soldering iron handle is placed on a bracket, so that current from the power input terminal is transmitted to the first switching circuit 10, thereby controlling the first switching circuit 10 to be turned on. The power output by the power supply is transmitted to the soldering iron tip via the first switching circuit 10. After receiving the power, the soldering iron tip begins to heat up. Current is also transmitted to the capacitor circuit 30 to charge the capacitor circuit 30. When the soldering iron handle leaves the bracket, the second switching circuit 20 is disconnected, and the capacitor circuit 30 continuously discharges to the controlled terminal of the first switching circuit 10, so that the first switching circuit 10 remains conductive for a preset time. After the capacitor circuit 30 has released all the stored power, the first switching circuit 10 is turned off, and the soldering iron tip stops heating. With such a setting, in actual application, when the temperature of the soldering iron tip reaches the preset temperature, the user moves the soldering iron away from the bracket to solder the components. Since the soldering iron tip can only be heated within the preset time after the soldering iron is removed from the bracket, the user can only solder the components within the preset time. After the preset time, the soldering iron needs to be placed on the bracket again to heat the soldering iron tip. In this way, the user can only solder the components within the preset time, thereby avoiding damage to the components at the welding point caused by long-term high temperature.

[0048] The first switch circuit 10 may be partially turned on when receiving a relatively low voltage, so that a relatively low current flows to the soldering iron tip through the first switch circuit 10. When the voltage of the capacitor circuit 30 slowly decreases with discharge, the first switch circuit 10 is not completely turned off, so that the soldering iron tip continues to heat up, thereby extending the heating time of the soldering iron tip. Prolonged high-temperature soldering may damage components on the circuit board.

[0049] To solve the above problems, refer to Figure 2 In one embodiment of the present invention, the first switch circuit 10 includes:

[0050] a first switch tube Q1, wherein an input end of the first switch tube Q1 is electrically connected to a power input end, and an output end of the first switch tube Q1 is electrically connected to a power output end;

[0051] A high-voltage conduction circuit 11 has a first end electrically connected to the output end of the first switch circuit 10 , and a second end electrically connected to the controlled end of the first switch tube Q1 .

[0052] In this embodiment, the first switch tube Q1 can be implemented by a MOS tube, an IGBT tube, a thyristor, a triode, a power tube, etc., and / or by at least one switching device, such as a contactor, a circuit breaker, and a relay.

[0053] In this embodiment, the high voltage conduction circuit 11 includes:

[0054] a first resistor R1, wherein a first end of the first resistor R1 is connected to the output end of the second switch circuit 20, and a second end of the first resistor R1 is connected to the input end of the capacitor circuit 30;

[0055] A bidirectional trigger diode D1, wherein a first end of the bidirectional trigger diode D1 is electrically connected to the output end of the second switch circuit 20 and the second end of the first resistor R1 respectively, and a second end of the bidirectional trigger diode D1 is electrically connected to the controlled end of the first switch tube Q1.

[0056] In this embodiment, the high-voltage conduction circuit 11 can be any one of a Zener diode or a bidirectional trigger diode D1. The high-voltage conduction circuit 11 is configured to conduct when the voltage at the first end is greater than a preset voltage. The preset voltage is the conduction voltage of the bidirectional trigger diode D1. In this configuration, the conduction voltage of the bidirectional trigger diode D1 is adjusted to the conduction voltage of the first switch tube Q1. When the voltage of the capacitor circuit 30 slowly decreases and drops to the preset voltage, the bidirectional trigger diode D1 is turned off, so that the voltage of the capacitor circuit 30 cannot be transmitted to the controlled end of the first switch tube Q1. The first switch tube Q1 is completely turned off, thereby controlling the soldering iron tip to stop heating within a preset time, avoiding the situation where the switch circuit has not been completely closed and the soldering iron tip continues to heat.

[0057] refer to Figure 2 In one embodiment of the present invention, the second switch circuit 20 includes:

[0058] The magnetic induction component 21 has a first end electrically connected to the power input end, and a second end electrically connected to the controlled end of the first switch circuit 10 .

[0059] In this embodiment, the magnetic sensing component 21 comprises a magnetic switch such as a Hall effect switch, a flux tube, a reed switch, or a magnetically controlled relay. The magnetic sensing component 21 is disposed on the portion of the soldering iron handle that is intended to be placed in conjunction with the bracket. If the bracket is provided with a magnet for cooperating with the soldering iron handle, when the user places the soldering iron handle on the bracket, the magnetic sensing component 21 senses the magnetic field and automatically turns on, thereby transmitting the voltage and current at the power input end to the controlled end of the first switch circuit 10, and turning on the first switch circuit 10. For example, when the reed switch or magnetically controlled relay senses the magnetic field of the magnet provided on the bracket, the reeds of the reed switch attract each other due to magnetization, causing the contacts to close. This activates the electromagnet within the magnetically controlled relay, causing the contacts to close, thereby achieving conduction. For another example, when the magnetic field of a magnet acts on a flux tube, the magnetic core of the flux tube is flipped due to the action of the magnetic lines of force. After the magnetic core flips, the conductive pieces of the flux tube are in contact and the circuit is closed, thereby achieving conduction. Since the flux tube has the advantages of small size and low cost, it is suitable for use in soldering iron handles. Therefore, it is more appropriate for the magnetic induction component 21 to use a flux tube.

[0060] refer to Figure 2 In one embodiment of the present invention, the control circuit further includes:

[0061] The filter circuit 40 has an input terminal electrically connected to the power input terminal, and an output terminal electrically connected to the power output terminal.

[0062] In this embodiment, the filtering circuit 40 includes:

[0063] A first inductor L1 and a second capacitor C2, wherein a first end of the first inductor L1 is electrically connected to a power input end, and a second end of the first inductor L1 is electrically connected to an input end of the second switch circuit 20 and an input end of the first switch circuit 10 respectively.

[0064] In this embodiment, the filter circuit 40 may employ an LC filter circuit. Voltage fluctuations may occur at the power input, potentially due to factors such as grid voltage variations and load changes. The LC filter circuit effectively suppresses voltage fluctuations through the energy storage and release of its capacitor and inductor components, providing a relatively stable power supply voltage for the soldering iron tip, thereby ensuring stable operation of the soldering iron tip.

[0065] The utility model also provides a soldering iron handle, which comprises a power input terminal, a power output terminal and the control circuit as described above.

[0066] It is worth noting that since the soldering iron handle of the present invention is based on the above-mentioned control circuit, the embodiments of the soldering iron handle of the present invention include all technical solutions of all embodiments of the above-mentioned control circuit, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0067] The utility model also provides a soldering iron, comprising the above-mentioned soldering iron handle and a soldering iron head, wherein the soldering iron head is connected to the soldering iron handle.

[0068] It is worth noting that, since the soldering iron of the present invention is based on the above-mentioned soldering iron handle, the embodiments of the soldering iron of the present invention include all technical solutions of all embodiments of the above-mentioned soldering iron handle, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0069] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A control circuit, applied to a soldering iron handle, wherein the soldering iron handle comprises a power input terminal and a power output terminal, wherein the power input terminal is connected to a power supply, and the power output terminal is connected to a power input terminal of a soldering iron tip, wherein: The control circuit comprises: a first switch circuit, wherein an input end of the first switch circuit is electrically connected to a power input end, and an output end of the first switch circuit is electrically connected to a power output end; a second switch circuit, wherein an input end of the second switch circuit is electrically connected to the power input end, an output end of the second switch circuit is electrically connected to the controlled end of the first switch circuit, and the second switch circuit is configured to be turned on when the soldering iron handle is placed on the bracket, and to be turned off when the soldering iron handle is away from the bracket; A capacitor circuit, wherein a first end of the capacitor circuit is electrically connected to the output end of the second switch circuit and the controlled end of the first switch circuit respectively.

2. The control circuit according to claim 1, wherein: The first switching circuit includes: a first switching tube, wherein an input end of the first switching tube is electrically connected to a power input end, and an output end of the first switching tube is electrically connected to a power output end; A high-voltage conduction circuit, wherein a first end of the high-voltage conduction circuit is electrically connected to the output end of the first switch circuit, and a second end of the high-voltage conduction circuit is electrically connected to the controlled end of the first switch tube.

3. The control circuit according to claim 2, wherein: The high voltage conduction circuit comprises: a first resistor, wherein a first end of the first resistor is connected to the output end of the second switch circuit, and a second end of the first resistor is connected to the input end of the capacitor circuit; A bidirectional trigger diode, wherein the first end of the bidirectional trigger diode is electrically connected to the output end of the second switch circuit and the second end of the first resistor respectively, and the second end of the bidirectional trigger diode is electrically connected to the controlled end of the first switch tube.

4. The control circuit according to claim 1, wherein: The second switching circuit includes: A magnetic induction component, wherein a first end of the magnetic induction component is electrically connected to the power input end, and a second end of the magnetic induction component is electrically connected to the controlled end of the first switch circuit.

5. The control circuit according to claim 4, wherein: The magnetic induction component includes: A magnetic flux tube, wherein a first end of the magnetic flux tube is electrically connected to the power input end, and a second end of the magnetic flux tube is electrically connected to the controlled end of the first switching circuit.

6. The control circuit according to claim 1, wherein: The capacitor circuit comprises: A first capacitor, wherein a first end of the first capacitor is electrically connected to the output end of the second switch circuit and the controlled end of the first switch circuit respectively, and a second end of the first capacitor is electrically connected to the power supply output end.

7. The control circuit according to claim 1, wherein: The control circuit further includes: A filter circuit, wherein the input end of the filter circuit is electrically connected to the power input end, and the output end of the filter circuit is electrically connected to the power output end.

8. The control circuit according to claim 7, wherein: The filtering circuit comprises: A first inductor and a second capacitor, wherein a first end of the first inductor is electrically connected to a power input end, and a second end of the first inductor is electrically connected to an input end of the second switching circuit and an input end of the first switching circuit respectively.

9. A soldering iron handle, characterized in that: The device comprises a power input terminal, a power output terminal and a control circuit as claimed in any one of claims 1 to 8.

10. A soldering iron, characterized in that: The invention comprises the soldering iron handle as claimed in claim 9, and a soldering iron tip, wherein the soldering iron tip is connected to the soldering iron handle.

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