CN207321108U - The HV pins protection circuit of pwm chip - Google Patents
The HV pins protection circuit of pwm chip Download PDFInfo
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- CN207321108U CN207321108U CN201721256677.7U CN201721256677U CN207321108U CN 207321108 U CN207321108 U CN 207321108U CN 201721256677 U CN201721256677 U CN 201721256677U CN 207321108 U CN207321108 U CN 207321108U
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Abstract
PWM控制芯片的HV引脚保护电路，包括高压电容滤波电路和芯片，高压电容滤波电路一侧连接有PWM控制芯片高压输入电路，PWM控制芯片高压输入电路连接芯片的HV引脚，PWM控制芯片高压输入电路包括第一电阻、第一电阻、第一电容和第二电容，PWM控制芯片高压输入电路的输入端连接有三相四线整流输入，输出端连接高压电容滤波电路，输出端位于第一电容和第二电容之间。本实用新型具有以下有益效果：第一电容和第二电容能够完成电压的一半化，使得第五电阻经过电流仅为1μA，故而PWM控制芯片高压输入电路中的所有器件的功耗均不会烧坏。
The HV pin protection circuit of the PWM control chip includes a high-voltage capacitor filter circuit and chip. One side of the high-voltage capacitor filter circuit is connected to the high-voltage input circuit of the PWM control chip. The high-voltage input circuit of the PWM control chip is connected to the HV pin of the chip, and the high-voltage input circuit of the PWM control chip The input circuit includes a first resistor, a first resistor, a first capacitor, and a second capacitor. The input end of the high-voltage input circuit of the PWM control chip is connected to a three-phase four-wire rectification input, and the output end is connected to a high-voltage capacitor filter circuit. The output end is located at the first capacitor and the second capacitor. The utility model has the following beneficial effects: the first capacitor and the second capacitor can complete half of the voltage, so that the current passing through the fifth resistor is only 1μA, so the power consumption of all devices in the high-voltage input circuit of the PWM control chip will not be burned. Bad.
Description
技术领域technical field
本实用新型属于开关电源领域，具体涉及PWM控制芯片的HV引脚保护电路。The utility model belongs to the field of switching power supplies, in particular to an HV pin protection circuit of a PWM control chip.
背景技术Background technique
如图1所示，开关电源PWM 控制芯片N1，其中的7号引脚HV为高压输入端，耐压为700V，但是南网技术规范明确要求终端需要在2倍UN， 即1074V下正常工作，此时需要增加一个保护电路去保护此芯片挺7号引脚HV。As shown in Figure 1, the switching power supply PWM control chip N1, pin 7 HV is a high-voltage input terminal, with a withstand voltage of 700V, but the technical specifications of the South Grid clearly require that the terminal needs to work normally at 2 times UN, that is, 1074V. At this time, it is necessary to add a protection circuit to protect the pin 7 HV of this chip.
如图1的框图1所示这是以前的做法，其中双向击穿二极管VD1是为了防止低压启动，双向击穿二极管VD3是为了高压钳位，而在电压高达1027V时，此电路的第五电阻R5的功耗增加致使第五电阻R5经常损坏。As shown in the block diagram 1 of Figure 1, this is the previous practice, where the bidirectional breakdown diode VD1 is to prevent low-voltage startup, and the bidirectional breakdown diode VD3 is for high-voltage clamping. When the voltage is as high as 1027V, the fifth resistor of this circuit The power consumption of R5 is increased so that the fifth resistor R5 is often damaged.
发明内容Contents of the invention
针对现有技术中的不足，本实用新型提供PWM控制芯片的HV引脚保护电路，来解决现有的保护电路，第五电阻R5的功耗增加致使第五电阻R5经常损坏的问题。Aiming at the deficiencies in the prior art, the utility model provides the HV pin protection circuit of the PWM control chip to solve the problem that the power consumption of the fifth resistor R5 is often damaged due to the increase of power consumption of the fifth resistor R5 in the existing protection circuit.
本实用新型通过以下技术方案实现。The utility model is realized through the following technical solutions.
PWM控制芯片的HV引脚保护电路，包括高压电容滤波电路和芯片，所述的高压电容滤波电路一侧连接有PWM控制芯片高压输入电路，所述的PWM控制芯片高压输入电路连接芯片的HV引脚，所述的PWM控制芯片高压输入电路包括第一电阻、第一电阻、第一电容和第二电容，所述的PWM控制芯片高压输入电路的输入端连接有三相四线整流输入，输出端连接高压电容滤波电路，所述的输出端位于第一电容和第二电容之间。The HV pin protection circuit of the PWM control chip includes a high-voltage capacitor filter circuit and a chip. One side of the high-voltage capacitor filter circuit is connected to a high-voltage input circuit of the PWM control chip, and the high-voltage input circuit of the PWM control chip is connected to the HV pin of the chip. Pin, the high-voltage input circuit of the PWM control chip includes a first resistor, a first resistor, a first capacitor and a second capacitor, the input end of the high-voltage input circuit of the PWM control chip is connected with a three-phase four-wire rectifier input, and the output terminal A high-voltage capacitor filter circuit is connected, and the output terminal is located between the first capacitor and the second capacitor.
作为优选，所述的第一电阻的一端连接有三相四线整流输入，另一端连接第四电阻的一端，第四电阻的另一端连接三相四线整流输入，所述的第一电容的一端连接第一电阻的一端，所述的第一电容的另一端连接第二电容的一端，第二电容的另一端连接第四电阻的另一端。Preferably, one end of the first resistor is connected to a three-phase four-wire rectification input, the other end is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to a three-phase four-wire rectification input, and one end of the first capacitor One end of the first resistor is connected, the other end of the first capacitor is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the other end of the fourth resistor.
作为优选，所述的第二电容的一端连接高压电容滤波电路。Preferably, one end of the second capacitor is connected to a high-voltage capacitor filter circuit.
作为优选，所述的高压电容滤波电路包括双向击穿二极管和第五电阻，所述的双向击穿二极管和第五电阻串联，所述的双向击穿二极管的一端连接第二电容的一端。Preferably, the high-voltage capacitor filter circuit includes a bidirectional breakdown diode and a fifth resistor, the bidirectional breakdown diode and the fifth resistor are connected in series, and one end of the bidirectional breakdown diode is connected to one end of the second capacitor.
作为优选，所述的芯片的型号为FAN6605。Preferably, the model of the chip is FAN6605.
与现有技术相比：电压低于设置电压时，电路不工作，功率损耗几乎为0，电压高于设置电压时，MOS管、TVS管将电压钳位至设置电压，使得后端电压都在设置电压以下。Compared with the existing technology: when the voltage is lower than the set voltage, the circuit does not work, and the power loss is almost zero; when the voltage is higher than the set voltage, the MOS tube and TVS tube clamp the voltage to the set voltage, so that the back-end voltage is at set the voltage below.
附图说明Description of drawings
图1为本实用新型的电路连接框图。Fig. 1 is the circuit connection block diagram of the utility model.
图2为本实用新型的现有技术的电路连接图。Fig. 2 is the circuit connection diagram of the prior art of the utility model.
具体实施方式Detailed ways
下面结合附图与具体实施方式，对本实用新型做进一步描述。Below in conjunction with accompanying drawing and specific embodiment, the utility model is described further.
PWM控制芯片的HV引脚保护电路，包括高压电容滤波电路1和芯片N1，其特征在于，所述的高压电容滤波电路1一侧连接有PWM控制芯片高压输入电路2，所述的PWM控制芯片高压输入电路2连接芯片N1的HV引脚，所述的PWM控制芯片高压输入电路2包括第一电阻R1、第一电阻R5、第一电容CE1和第二电容CE2，所述的PWM控制芯片高压输入电路2的输入端连接有三相四线整流输入，输出端连接高压电容滤波电路1，所述的输出端位于第一电容CE1和第二电容CE2之间，所述的第一电阻R1的一端连接有三相四线整流输入，另一端连接第四电阻R4的一端，第四电阻R4的另一端连接三相四线整流输入，所述的第一电容CE1的一端连接第一电阻R1的一端，所述的第一电容CE1的另一端连接第二电容CE2的一端，第二电容CE2的另一端连接第四电阻R4的另一端，所述的第二电容CE2的一端连接高压电容滤波电路1，所述的高压电容滤波电路1包括双向击穿二极管VD1和第五电阻R5，所述的双向击穿二极管VD1和第五电阻R5串联，所述的双向击穿二极管VD1的一端连接第二电容CE2的一端，所述的芯片N1的型号为FAN6605。The HV pin protection circuit of the PWM control chip includes a high-voltage capacitor filter circuit 1 and a chip N1, and is characterized in that one side of the high-voltage capacitor filter circuit 1 is connected to a PWM control chip high-voltage input circuit 2, and the PWM control chip The high-voltage input circuit 2 is connected to the HV pin of the chip N1. The high-voltage input circuit 2 of the PWM control chip includes a first resistor R1, a first resistor R5, a first capacitor CE1 and a second capacitor CE2. The high-voltage input circuit of the PWM control chip The input end of the input circuit 2 is connected to a three-phase four-wire rectification input, and the output end is connected to a high-voltage capacitor filter circuit 1, the output end is located between the first capacitor CE1 and the second capacitor CE2, and one end of the first resistor R1 Connected to a three-phase four-wire rectification input, the other end is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to a three-phase four-wire rectification input, one end of the first capacitor CE1 is connected to one end of the first resistor R1, The other end of the first capacitor CE1 is connected to one end of the second capacitor CE2, the other end of the second capacitor CE2 is connected to the other end of the fourth resistor R4, and one end of the second capacitor CE2 is connected to the high voltage capacitor filter circuit 1, The high-voltage capacitor filter circuit 1 includes a bidirectional breakdown diode VD1 and a fifth resistor R5, the bidirectional breakdown diode VD1 and the fifth resistor R5 are connected in series, and one end of the bidirectional breakdown diode VD1 is connected to the second capacitor CE2 At one end, the model of the chip N1 is FAN6605.
借用第一电容CE1和第二电容CE2高压电容的来进行1/2分压，这样就可以达到即使三相四线整流输入电压为1027V时，芯片N1的HV引脚也不会达到700V，并且高压电容滤波电路1和PWM控制芯片高压输入电路2启动后，PWM控制芯片高压输入电路2中的电流仅为1μA，故而PWM控制芯片高压输入电路2中的所有器件的功耗均不会烧坏。本实用新型的保护范围包括但不限于以上实施方式，本实用新型的保护范围以权利要求书为准，任何对本技术做出的本领域的技术人员容易想到的替换、变形、改进均落入本实用新型的保护范围。Use the high-voltage capacitors of the first capacitor CE1 and the second capacitor CE2 to divide the voltage by 1/2, so that even when the input voltage of the three-phase four-wire rectifier is 1027V, the HV pin of the chip N1 will not reach 700V, and After the high-voltage capacitor filter circuit 1 and the high-voltage input circuit 2 of the PWM control chip are started, the current in the high-voltage input circuit 2 of the PWM control chip is only 1 μA, so the power consumption of all devices in the high-voltage input circuit 2 of the PWM control chip will not burn out . The scope of protection of the present utility model includes but not limited to the above embodiments, the scope of protection of the present utility model is subject to the claims, and any replacement, deformation, and improvement that are easily thought of by those skilled in the art all fall within this specification. Protection scope of utility model.
Claims (5)
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| CN201721256677.7U CN207321108U (en) | 2017-09-28 | 2017-09-28 | The HV pins protection circuit of pwm chip |
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| CN207321108U true CN207321108U (en) | 2018-05-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115174875A (en) * | 2022-09-08 | 2022-10-11 | 深圳市飞思卓科技有限公司 | HDMI high-definition data line and data transmission method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115174875A (en) * | 2022-09-08 | 2022-10-11 | 深圳市飞思卓科技有限公司 | HDMI high-definition data line and data transmission method |
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