Conversion circuit and electronic device

Abstract

The application provides a conversion circuit and an electronic device. The conversion circuit comprises a first thyristor, a control chip, a rectifier bridge and a voltage conversion unit. The control chip is electrically connected with a control electrode of the first thyristor, and is used for controlling the first thyristor to be turned on or turned off. A first end of the rectifier bridge is electrically connected with a positive electrode of the first thyristor, and a fourth end of the rectifier bridge is grounded. The rectifier bridge is used for converting a negative alternating voltage of a voltage source into a positive direct current voltage. The voltage conversion unit is electrically connected with the control chip and the first end of the rectifier bridge respectively, and is used for converting the positive direct current voltage into a target voltage to charge the control chip. The target voltage is a voltage required by the control chip to control the first thyristor to be turned on, so that the first thyristor is turned on, and then the positive direct current voltage output by the rectifier bridge is applied to a heat generating device to supply power for the heat generating device, so that the heat generating device generates heat, and the problem of high cost of a control circuit of the heat generating device in the prior art is solved.

Description

Technical Field

[0001] This application relates to the field of charging technology, and more specifically, to a conversion circuit and electronic device. Background Technology

[0002] Many household appliances currently use heating elements, including high-power electric heaters, steam ovens, kettles, rice cookers, etc., as well as low-power items such as cup warmers, insulated cutting boards, and foot warmers. Control methods include thyristors and relays. Generally, for applications requiring low power and low cost, thyristors with appropriate parameters are often used. However, since thyristors cannot operate in the fourth quadrant, the control signal must be powered by a negative voltage (i.e., BUCK-BOOST topology output). Many low-cost or small-size applications can only use linear power supplies, and since linear power supplies always output positive voltages, a bidirectional optocoupler must be used to control the thyristor, making direct control impossible and indirectly leading to higher costs and failure to meet design requirements. Summary of the Invention

[0003] The main objective of this application is to provide a conversion circuit and electronic device to solve the problem of high cost of control circuits for heat-generating devices in existing solutions.

[0004] To achieve the above objectives, according to one aspect of this application, a conversion circuit is provided, comprising a first thyristor, a control chip, a rectifier bridge, and a voltage conversion unit; the first thyristor has a positive electrode, a negative electrode, and a control electrode, the negative electrode of the first thyristor being electrically connected to a heating device; the control chip is electrically connected to the control electrode of the first thyristor and is used to control the first thyristor to conduct or cut off; the rectifier bridge has a first terminal, a second terminal, a third terminal, and a fourth terminal, the first terminal of the rectifier bridge being electrically connected to the positive electrode of the first thyristor, the second and third terminals of the rectifier bridge being used to input a voltage source, the fourth terminal of the rectifier bridge being grounded, and the rectifier bridge being used to convert the negative AC voltage of the voltage source into a positive DC voltage; the voltage conversion unit is electrically connected to the control chip and the first terminal of the rectifier bridge respectively, and is used to convert the positive DC voltage into a target voltage to charge the control chip, the target voltage being the voltage required for the control chip to control the first thyristor to conduct.

[0005] Furthermore, the voltage conversion unit includes a voltage conversion circuit and a voltage regulator circuit. The voltage conversion circuit has an input terminal and an output terminal. The input terminal of the voltage conversion circuit is electrically connected to the first terminal of the rectifier bridge and the positive terminal of the first thyristor, respectively, for converting the forward DC voltage into the target voltage. The voltage regulator circuit has an input terminal and an output terminal. The input terminal of the voltage regulator circuit is electrically connected to the output terminal of the voltage conversion circuit, and the output terminal of the voltage regulator circuit is electrically connected to the control chip, for regulating the target voltage.

[0006] Further, the voltage conversion circuit includes a first resistor module, a second resistor module, a third resistor module, a first capacitor module, a first diode, a second diode, a second thyristor, and a voltage regulator module. The first terminal of the first resistor module is electrically connected to the positive terminal of the first thyristor, the positive terminal of the second thyristor, and the first terminal of the rectifier bridge. The second terminal of the first resistor module is electrically connected to the negative terminal of the first diode, the first terminal of the voltage regulator module, and the first terminal of the first capacitor module. The second terminal of the first capacitor module is electrically connected to the first terminal of the second resistor module, the first terminal of the third resistor module, and the second terminal of the voltage regulator module. The third terminal of the voltage regulator module is electrically connected to the negative terminal of the second thyristor and the second terminal of the second resistor module. The second terminal of the third resistor module is electrically connected to the positive terminal of the second diode. The negative terminal of the second diode is electrically connected to the input terminal of the voltage regulator circuit. The positive terminal of the first diode is electrically connected to the control electrode of the second thyristor.

[0007] Furthermore, the voltage regulator circuit also includes a first transistor, a first electrolytic capacitor module, and a third diode. The emitter of the first transistor is electrically connected to the control chip, and the base of the first transistor is electrically connected to the collector of the first transistor, the cathode of the third diode, the cathode of the second diode, and the first terminal of the first electrolytic capacitor module. The anode of the second diode and the second terminal of the first electrolytic capacitor module are grounded.

[0008] Furthermore, the voltage regulator module includes a second transistor and a fourth resistor module. The collector of the second transistor is electrically connected to the first terminal of the first capacitor module, the second terminal of the first resistor module, and the negative terminal of the first diode, respectively. The emitter of the second transistor is electrically connected to the first terminal of the fourth resistor module. The second terminal of the fourth resistor module is electrically connected to the second terminal of the first capacitor module, the first terminal of the second resistor module, and the first terminal of the third resistor module, respectively. The base of the second transistor is electrically connected to the negative terminal of the second thyristor and the second terminal of the second resistor module, respectively.

[0009] Furthermore, the voltage regulator module also includes a fifth resistor module, the first end of which is electrically connected to the base of the second transistor, and the second end of which is electrically connected to the negative terminal of the second thyristor and the second end of the second resistor module, respectively.

[0010] Furthermore, the voltage regulator circuit also includes a second electrolytic capacitor module. The first terminal of the second electrolytic capacitor module is electrically connected to the emitter of the first transistor and the control chip, respectively, and the second terminal of the second electrolytic capacitor module is grounded.

[0011] Furthermore, the voltage regulator circuit also includes a sixth resistor module. The first end of the sixth resistor module is electrically connected to the base of the first transistor and the negative terminal of the third diode, respectively. The second end of the sixth resistor module is electrically connected to the first end of the second electrolytic capacitor module, the collector of the first transistor, and the negative terminal of the second diode, respectively.

[0012] Furthermore, both the first diode and the third diode are tunnel diodes.

[0013] According to another aspect of this application, an electronic device is provided, which includes any of the above-described conversion circuits and a heating element, wherein the conversion circuit is electrically connected to the heating element.

[0014] By applying the technical solution of this application, the positive DC voltage is converted into a target voltage through a voltage conversion unit to charge the control chip. The target voltage is the voltage required for the control chip to control the first thyristor to conduct, thereby enabling the first thyristor to conduct. Then, the positive DC voltage output by the rectifier bridge is applied to the heating device to supply power to the heating device, so that the heating device generates heat. This solves the problem of high cost of the control circuit for the heating device in the existing solution. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 A schematic diagram of a conversion circuit according to an embodiment of this application is shown;

[0017] Figure 2 A voltage curve across the heating device according to an embodiment of this application is shown.

[0018] The above figures include the following reference numerals:

[0019] 10. Voltage conversion unit; 11. Voltage conversion circuit; 111. Voltage regulator module; 12. Voltage regulator circuit; 20. Control chip. Detailed Implementation

[0020] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be an intermediate element present. Furthermore, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element via a third element.

[0023] As described in the background section, in existing solutions, since the thyristor cannot operate in the fourth quadrant, the control signal must be powered by a negative voltage (i.e., BUCK-BOOST topology output) to achieve this. However, many low-cost or small-size applications can only use linear power supplies, and the output voltage of linear power supplies is always positive. To control the thyristor, a bidirectional optocoupler must be used, which cannot be directly controlled, thus indirectly leading to higher costs and failing to meet design requirements. In order to solve the problem of high cost of control circuits for heat-generating devices in existing solutions, this application proposes a conversion circuit and electronic device.

[0024] A conversion circuit, such as Figure 1As shown, the conversion circuit includes a first thyristor TR2, a control chip 20, a rectifier bridge DB1, and a voltage conversion unit 10. The first thyristor TR2 has a positive electrode, a negative electrode, and a control electrode. The negative electrode of the first thyristor TR2 is used to electrically connect to the heating device RQ. The I / O port of the control chip 20 is electrically connected to the control electrode of the first thyristor TR2 to control the first thyristor TR2 to be turned on or off. The rectifier bridge DB1 has a first terminal, a second terminal, a third terminal, and a fourth terminal. The first terminal of the rectifier bridge DB1 is electrically connected to the positive electrode of the first thyristor TR2, and the second terminal of the rectifier bridge DB1 is connected to the positive electrode of the first thyristor TR2. The three terminals are used to input the voltage source (the second terminal of the rectifier bridge DB1 is electrically connected to the L terminal of the voltage source, and the third terminal of the rectifier bridge DB1 is electrically connected to the R terminal of the voltage source). The fourth terminal of the rectifier bridge DB1 is grounded. The rectifier bridge DB1 is used to convert the negative AC voltage of the voltage source into a positive DC voltage. The voltage conversion unit is electrically connected to the VCC terminal of the control chip 20 and the first terminal of the rectifier bridge DB1, respectively, and is used to convert the positive DC voltage into a target voltage to charge the control chip 20. The target voltage is the voltage required for the control chip 20 to control the first thyristor TR2 to conduct. The control electrode of the second thyristor TR1 is connected to the first diode D1. It does not require control by the control chip. Its conduction angle is determined by the values ​​of the first resistor module R1 and the first capacitor module C1. By adjusting the first resistor module R1 and the first capacitor module C1, the conduction angle, i.e., the conduction time, of the thyristor can be changed.

[0025] In the aforementioned conversion circuit, the positive DC voltage is converted into a target voltage by a voltage conversion unit to charge the control chip. The target voltage is the voltage required for the control chip to control the first thyristor to conduct, thereby turning on the first thyristor. The positive DC voltage output from the rectifier bridge is then applied to the heating element to power it, causing it to heat up. This solves the problem of high cost of the control circuit for the heating element in existing solutions. The heating element can be a heating wire, and the voltage across the heating wire changes over time as follows: Figure 2 As shown, it exhibits a wave-like trend. For example, a voltage conversion circuit can directly convert 220V to the required low voltage, such as 5V, solving the problem of the trade-off between low cost and small size for signal power supplies; and a rectifier bridge can convert the load AC voltage to a positive DC voltage, thus enabling the positive DC voltage to directly drive the first thyristor and perfectly avoid operating in the fourth quadrant. The voltage conversion unit can be implemented using a dedicated high-voltage linear regulator chip, such as the PN8001, which has high practical value in some low-power heating elements and appliances requiring thin and compact appearance, such as ultra-thin cup warmers.

[0026] In one embodiment of this application, such as Figure 1As shown, the voltage conversion unit 10 includes a voltage conversion circuit 11 and a voltage regulator circuit 12. The voltage conversion circuit 11 has an input terminal and an output terminal. The input terminal of the voltage conversion circuit 11 is electrically connected to the first terminal of the rectifier bridge DB1 and the positive terminal of the first thyristor TR2, respectively, for converting the positive DC voltage into the target voltage. The voltage regulator circuit 12 has an input terminal and an output terminal. The input terminal of the voltage regulator circuit 12 is electrically connected to the output terminal of the voltage conversion circuit 11, and the output terminal of the voltage regulator circuit 12 is electrically connected to the VCC terminal of the control chip 20, for regulating the target voltage. By converting the positive DC voltage into the target voltage through the voltage conversion unit 10, and then regulating the target voltage through the voltage regulator circuit 12, a stable target voltage is provided for the control chip 20 to control the conduction of the first thyristor TR2. The output terminal of the voltage regulator circuit 12 is electrically connected to the power supply terminal of the control chip 20, for providing a stable input voltage to the control chip 20.

[0027] In one embodiment of this application, such as Figure 1As shown, the voltage conversion circuit 11 includes a first resistor module R1, a second resistor module R4, a third resistor module R5, a first capacitor module C1, a first diode D1, a second diode D2, a second thyristor TR1, and a voltage regulator module 111. The first terminal of the first resistor module R1 is electrically connected to the positive terminal of the first thyristor TR2, the positive terminal of the second thyristor TR1, and the first terminal of the rectifier bridge DB1. The second terminal of the first resistor module R1 is electrically connected to the negative terminal of the first diode D1, the first terminal of the voltage regulator module 111, and the first terminal of the first capacitor module C1. The second terminal of the first capacitor module C1 is electrically connected to the first terminal of the second resistor module R4, the first terminal of the third resistor module R5, and the second terminal of the voltage regulator module 111. The third terminal of the voltage regulator module 111 is electrically connected to the negative terminal of the second thyristor TR1 and the second terminal of the second resistor module R4. The second terminal of the third resistor module R5 is electrically connected to the positive terminal of the second diode D2. The negative terminal of the second diode D2 is electrically connected to the input terminal of the voltage regulator circuit 12. The positive terminal of the first diode D1 is electrically connected to the control terminal of the second thyristor TR1. When L and N are connected to the mains power, the mains power enters as a unidirectional vortex after passing through the rectifier bridge DB1. It charges the first capacitor module C1 through the first resistor module R1. By selecting a suitable first resistor module R1 to charge the first capacitor module C1, the time constant can be determined, thereby determining the conduction angle of the first thyristor TR2, that is, determining the conduction time of a single vortex. When the voltage of the first capacitor module C1 reaches the conduction voltage of the first diode D1, the first diode D1 conducts, the control electrode of the thyristor is energized, and the thyristor conducts. The first electrolytic capacitor module C2 of the voltage regulator circuit 12 is quickly charged through the second resistor module R4, the third resistor module R5, and the second diode D2. The first electrolytic capacitor module C2 rises rapidly, and the output terminal of the voltage regulator circuit 12 begins to output a stable target voltage. The time constant is the product of the first resistor module R1 and the first capacitor module C1. That is, within one half-wave period of AC (e.g., 10ms), the moment when the voltage of the first capacitor module C1 can charge to the conduction voltage of the first diode D1 can be determined by the value of the first resistor module R1. When the conduction voltage of the first diode D1 is reached, the second thyristor TR1 can be turned on, and this is called the conduction angle of the second thyristor TR1.

[0028] In one embodiment of this application, such as Figure 1As shown, the voltage regulator circuit 12 further includes a first transistor Q2, a first electrolytic capacitor module C2, and a third diode D3. The emitter of the first transistor Q2 is electrically connected to the VCC terminal of the control chip 20. The base of the first transistor Q2 is electrically connected to the collector of the first transistor Q2, the cathode of the third diode D3, the cathode of the second diode D2, and the first terminal of the first electrolytic capacitor module C2. The anode of the second diode D2 and the second terminal of the first electrolytic capacitor module C2 are grounded. After the first electrolytic capacitor module C2 rapidly increases in voltage, it enables the first transistor Q2 to output a stable target voltage to the VCC terminal of the control chip 20. With the thyristor TR1 conducting, the mains power charges the first electrolytic capacitor module C2 through the second thyristor TR1, the second resistor module R4, the third resistor module R5, and the second diode D2. Since the resistance values ​​of the second resistor module R4 and the third resistor module R5 are relatively small, the voltage of the first electrolytic capacitor module C2 rises quickly. As the input capacitor of the voltage regulator, the rise in the voltage value on the first electrolytic capacitor module C2 indicates the presence of an input voltage, which will naturally output a stable voltage at the output terminal.

[0029] In one embodiment of this application, such as Figure 1 As shown, the voltage regulator module 111 includes a second transistor Q1 and a fourth resistor module R3. The collector of the second transistor Q1 is electrically connected to the first terminal of the first capacitor module C1, the second terminal of the first resistor module R1, and the negative terminal of the first diode D1. The emitter of the second transistor Q1 is electrically connected to the first terminal of the fourth resistor module R3. The second terminal of the fourth resistor module R3 is electrically connected to the second terminal of the first capacitor module C1, the first terminal of the second resistor module R4, and the first terminal of the third resistor module R5. The base of the second transistor Q1 is electrically connected to the negative terminal of the second thyristor TR1 and the second terminal of the second resistor module R4. The second transistor Q1 and the fourth resistor module R3 provide a charge discharge path for the first capacitor module C1.

[0030] In one embodiment of this application, such as Figure 1 As shown, the voltage regulator module 111 further includes a fifth resistor module R2. The first terminal of the fifth resistor module R2 is electrically connected to the base of the second transistor Q1, and the second terminal of the fifth resistor module R2 is electrically connected to the negative terminal of the second thyristor TR1 and the second terminal of the second resistor module R4, respectively. The fifth resistor module R2 is used for protection circuits.

[0031] In one embodiment of this application, such as Figure 1As shown, the voltage regulator circuit 12 further includes a second electrolytic capacitor module C3. The first terminal of the second electrolytic capacitor module C3 is electrically connected to the emitter of the first transistor Q2 and the VCC terminal of the control chip 20, respectively, and the second terminal of the second electrolytic capacitor module C3 is grounded. The second electrolytic capacitor module C3 serves to reduce the output voltage ripple.

[0032] In one embodiment of this application, such as Figure 1 As shown, the voltage regulator circuit 12 further includes a sixth resistor module R6. The first terminal of the sixth resistor module R6 is electrically connected to the base of the first transistor Q2 and the cathode of the third diode D3, respectively. The second terminal of the sixth resistor module R6 is electrically connected to the first terminal of the second electrolytic capacitor module C3, the collector of the first transistor Q2, and the cathode of the second diode D2, respectively. Before the first transistor Q2 is turned on, the sixth resistor module R6 provides base current to the first transistor Q2, thus turning on the first transistor Q2.

[0033] In one embodiment of this application, such as Figure 1 As shown, both the first diode D1 and the third diode D3 are tunnel diodes used for voltage regulation. The first diode D1 is a Zener diode, providing a reference voltage for the conduction of the second thyristor TR1. The third diode D3 is a general-purpose diode, which provides rectification using its unidirectional conductivity, i.e., forward conduction and reverse cutoff.

[0034] Embodiments of this application also provide an electronic device comprising any of the aforementioned conversion circuits and a heating element, wherein the conversion circuit is electrically connected to the heating element. A voltage conversion unit converts the aforementioned positive DC voltage into a target voltage to charge the control chip. The target voltage is the voltage required for the control chip to control the conduction of the first thyristor, thereby turning on the first thyristor. The positive DC voltage output from the rectifier bridge is then applied to the heating element to supply power, causing the heating element to generate heat. This solves the problem of high cost of the control circuit for the heating element in existing solutions.

[0035] It should be noted that the above electrical connection can be a direct electrical connection or an indirect electrical connection. A direct electrical connection means that two devices are directly connected, while an indirect electrical connection means that there are other devices such as capacitors and resistors connected between the connected A and B.

[0036] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0037] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0038] 1) The conversion circuit of this application converts the positive DC voltage into a target voltage through a voltage conversion unit to charge the control chip. The target voltage is the voltage required for the control chip to control the first thyristor to conduct, thereby enabling the first thyristor to conduct. Then, the positive DC voltage output by the rectifier bridge is applied to the heating device to supply power to the heating device, so that the heating device generates heat. This solves the problem of high cost of the control circuit for the heating device in the prior art.

[0039] 2) The electronic device of this application converts the positive DC voltage into a target voltage through a voltage conversion unit to charge the control chip. The target voltage is the voltage required for the control chip to control the first thyristor to conduct, thereby enabling the first thyristor to conduct. Then, the positive DC voltage output by the rectifier bridge is applied to the heating device to supply power to the heating device, so that the heating device generates heat. This solves the problem of high cost of the control circuit for the heating device in the prior art.

[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A conversion circuit, characterized by, The application relates to a voltage conversion unit. The application relates to a voltage conversion unit. The application relates to a voltage conversion unit. The application relates to a voltage conversion unit. The application relates to a voltage conversion unit. The application relates to a voltage conversion unit.

2. The conversion circuit of claim 1, wherein, The application relates to a voltage conversion unit. The application relates to a voltage conversion unit. The application relates to a voltage conversion unit.

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The conversion circuit of claim 1, wherein, The voltage stabilizing module comprises a second triode and a fourth resistance module, the collector of the second triode is electrically connected with the first end of the first capacitor module, the second end of the first resistance module and the negative electrode of the first diode respectively, the emitter of the second triode is electrically connected with the first end of the fourth resistance module, the second end of the fourth resistance module is electrically connected with the second end of the first capacitor module, the first end of the second resistance module and the first end of the third resistance module respectively, the base of the second triode is electrically connected with the negative electrode of the second thyristor and the second end of the second resistance module respectively.

5. The conversion circuit of claim 4, wherein, The voltage stabilizing module further comprises a fifth resistance module, the first end of the fifth resistance module is electrically connected with the base of the second triode, and the second end of the fifth resistance module is electrically connected with the negative electrode of the second thyristor and the second end of the second resistance module respectively.

6. The conversion circuit of claim 3, wherein, The voltage stabilizing circuit further comprises a second electrolytic capacitor module, the first end of the second electrolytic capacitor module is electrically connected with the emitter of the first triode and the control chip respectively, and the second end of the second electrolytic capacitor module is grounded.

7. The conversion circuit of claim 6, wherein, The voltage stabilizing circuit further comprises a sixth resistance module, the first end of the sixth resistance module is electrically connected with the base of the first triode and the negative electrode of the third diode respectively, and the second end of the sixth resistance module is electrically connected with the first end of the second electrolytic capacitor module, the collector of the first triode and the negative electrode of the second diode respectively.

8. The conversion circuit of claim 3, wherein, The first diode and the third diode are both tunnel diodes.

9. An electronic device, comprising: The conversion circuit and the heat generating device are electrically connected.

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