PFC enabling control circuit applied to PD product and PD product

Abstract

The invention relates to a PFC enabling control circuit applied to a PD product and the PD product. The PFC enabling control circuit comprises an input voltage detection control unit, an output total power detection control circuit and a PFC control chip. The input voltage detection control unit detects an alternating current input voltage value input into the PFC circuit and correspondingly outputs a segmented voltage adjustment instruction to the PFC control chip; the output total power detection control circuit is used for outputting a control instruction based on a detection and judgment result of the output total power of the PFC circuit; the PFC control chip adjusts the output voltage of the PFC circuit according to the segmented voltage adjustment instruction, controls the PFC circuit to be closed according to the PFC circuit closing instruction, and controls the PFC circuit to be opened according to the PFC circuit opening instruction; the energy efficiency problem is solved by combining the input characteristic dimension and the output characteristic dimension of a PD product, the requirement for six-level energy efficiency can be met under any combination no matter the input voltage is the combined voltage, and the product temperature is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of PD fast charging product research and development, and more specifically, to a PFC enabling control circuit and a PD product applied to a PD product. Background Art

[0002] Due to their unique output characteristics, current PD products struggle to meet energy efficiency requirements for all input and output combinations simultaneously, especially with the introduction of PD3.1, where the output voltage range extends to 3.3V to 28V and the current can be adjusted between 0A and 5A. Meeting energy efficiency requirements under all output conditions becomes extremely difficult.

[0003] At the same time, the power supply voltage varies from country to country. In order to ensure that the product is not restricted by region, the product input must cover the full voltage range of 90VAC to 264VAC. Energy efficiency must still meet the requirements under different input voltages, which many current products cannot do.

[0004] Low efficiency will affect the heat generation of the product. Therefore, some PD products on the market have the problem of excessive shell temperature rise when 90V input, full-load output, and multi-port combination are used. They are very hot and the user experience is extremely poor. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a PFC enabling control circuit applied to a PD product and a PD product in view of the above-mentioned defects of the prior art.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] Construct a PFC enabling control circuit for PD products, which includes an input voltage detection control unit, an output total power detection control circuit and a PFC control chip;

[0008] The input voltage detection control unit detects the AC input voltage value input to the PFC circuit and, based on the set segmented voltage value range to which the AC input voltage value belongs, outputs a segmented voltage adjustment instruction to the PFC control chip to reduce the voltage difference between the output voltage of the PFC circuit and the AC input voltage;

[0009] The output total power detection control circuit outputs a control instruction based on the detection and judgment result of the total output power of the PFC circuit: if the total output power exceeds the set power threshold, the circuit outputs a PFC circuit shutdown instruction to the PFC control chip; otherwise, the circuit outputs a PFC circuit startup instruction to the PFC control chip;

[0010] The PFC control chip adjusts the output voltage of the PFC circuit according to the segmented voltage adjustment instruction, controls the PFC circuit to be turned off according to the PFC circuit turn-off instruction, and controls the PFC circuit to be turned on according to the PFC circuit turn-on instruction. The instructions for controlling the PFC circuit to be turned off and on have a higher priority than the instructions for adjusting the output voltage of the PFC circuit.

[0011] In the PFC enabling control circuit for a PD product according to the present invention, the outputting of a segmented voltage adjustment instruction for reducing the voltage difference between the output voltage of the PFC circuit and the AC input voltage to the PFC control chip based on the set segmented voltage value range to which the AC input voltage value belongs includes:

[0012] When the AC input voltage exceeds the set voltage threshold, the pin voltage of the corresponding PFC control chip is pulled down;

[0013] When the AC input voltage does not exceed the set voltage threshold, the pin voltage of the corresponding PFC control chip is pulled high.

[0014] The PFC enable control circuit for a PD product according to the present invention comprises a first AC voltage input terminal, a second AC voltage input terminal, a first diode, a second diode, a third diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a voltage regulator diode, a first capacitor, and a first N-channel MOS transistor.

[0015] The anodes of the first diode and the second diode are connected to the first AC voltage input terminal and the second AC voltage input terminal, respectively. The cathodes of the first diode and the second diode are both connected to one end of the first resistor. The other end of the first resistor is connected in series with the second resistor, the third resistor, and the fourth resistor in sequence. The end of the fourth resistor connected to the third resistor is connected to the anode of the third diode, the cathode of the third diode is connected to the cathode of the Zener diode, and the anode of the Zener diode is connected to the G electrode of the first N-channel MOS transistor. The other end of the fourth resistor is connected in parallel with the fifth resistor, the sixth resistor, and the first capacitor, and the other end of the fourth resistor is grounded. The other end of the fifth resistor and the other end of the first capacitor are both connected to the G electrode of the first N-channel MOS transistor. The other end of the sixth resistor is connected to the S electrode of the first N-channel MOS transistor. The D electrode of the first N-channel MOS transistor is connected to the seventh resistor, and the other end of the seventh resistor is connected to the PFC control chip.

[0016] The PFC enabling control circuit for PD products of the present invention, wherein the set voltage threshold is 210VAC;

[0017] When the pin connecting the PFC control chip and the input voltage detection control unit is pulled low, the output voltage of the PFC circuit is controlled to increase from 280VDC to 390VDC;

[0018] When the pin connecting the PFC control chip and the input voltage detection control unit is pulled high, the output voltage of the PFC circuit is controlled to drop from 390 VDC back to 280 VDC.

[0019] The PFC enable control circuit for a PD product according to the present invention includes a signal input terminal, an eighth resistor, a ninth resistor, a second N-channel MOS transistor, a tenth resistor, an eleventh resistor, an output voltage input terminal, an optocoupler, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a second capacitor, and a third N-channel MOS transistor.

[0020] The signal input terminal is sequentially connected to the eighth resistor and the ninth resistor. The other end of the ninth resistor is connected to the S pole of the second N-channel MOS transistor and is grounded. The end of the eighth resistor connected to the ninth resistor is connected to the G pole of the second N-channel MOS transistor. The D pole of the second N-channel MOS transistor is connected to the tenth resistor and the K pole of the optocoupler. The other end of the tenth resistor is connected to the eleventh resistor and the A pole of the optocoupler. The other end of the eleventh resistor is connected to the output voltage input terminal. The C pole of the optocoupler is connected to the twelfth resistor, the second capacitor, and the G pole of the third N-channel MOS transistor. The S pole of the third N-channel MOS transistor is connected to the fourteenth resistor. The E pole of the optocoupler is connected to the other end of the twelfth resistor, the other end of the second capacitor, and the other end of the fourteenth resistor and are grounded. The D pole of the third N-channel MOS transistor is connected to the thirteenth resistor. The other end of the thirteenth resistor is connected to the PFC control chip.

[0021] The PFC enabling control circuit applied to PD products of the present invention, wherein the set power threshold is 65W.

[0022] The PFC enabling control circuit for a PD product disclosed in the present invention includes an EMC and rectifier filter circuit, a PFC inductor, a PFC freewheeling diode, and a filter circuit. The PFC circuit also includes a PFC switch connected to the PFC control chip, the PFC freewheeling diode, and the filter circuit, and configured to control the PFC circuit to be turned on and off, and to adjust the output voltage, according to instructions from the PFC control chip.

[0023] In the PFC enabling control circuit for PD products of the present invention, the AC input voltage value of the PFC circuit detected by the input voltage detection control unit is derived from the EMC and rectifier filter circuit.

[0024] The PFC enabling control circuit for PD products of the present invention, wherein the rear end of the filter circuit is connected to a DC conversion protocol control circuit;

[0025] The detection and judgment of the total output power of the PFC circuit are performed by the protocol chip of the DC conversion protocol control circuit.

[0026] A PD product is provided with the PFC enabling control circuit applied to the PD product as described above.

[0027] The beneficial effect of the present invention is that this patent combines the two characteristic dimensions of input and output of PD products to solve the problem of energy efficiency, achieving the goal of meeting the requirements of level 6 energy efficiency in any combination, regardless of input 90VAC~264VAC or output 3.3V~28V, 0A~5A. It not only solves the problem of regional restrictions on product sales and use, but also brings the additional technical effect of significantly reducing product temperature due to the improvement in energy efficiency. According to experimental verification data, the application of this invention in actual circuits can increase the efficiency of the product by 1.4% and reduce the product shell temperature by 9°C. 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 present invention will be further described below with reference to the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0029] Figure 1 This is a principle block diagram of a PFC enabling control circuit applied to a PD product according to a preferred embodiment of the present invention;

[0030] Figure 2 This is a circuit diagram of an input voltage detection control unit of a PFC enable control circuit applied to a PD product according to a preferred embodiment of the present invention;

[0031] Figure 3 This is a circuit diagram of a total output power detection control circuit of a PFC enable control circuit applied to a PD product according to a preferred embodiment of the present invention;

[0032] Figure 4 FIG. 4 is a circuit diagram of a PFC circuit of a PFC enable control circuit applied to a PD product according to a preferred embodiment of the present invention.

[0033] Figure 5 This is a supplementary circuit diagram of a PFC circuit of a PFC enable control circuit applied to a PD product according to a preferred embodiment of the present invention.

[0034] Figure 6 It is the temperature detection data of existing PD products.

[0035] Figure 7 It is the temperature detection data of the PD product to which the present invention is applied. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the following will be a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work shall fall within the scope of protection of the present invention.

[0037] The PFC enabling control circuit applied to PD products in a preferred embodiment of the present invention is as follows: Figure 1 See also Figure 2-Figure 7 , including an input voltage detection control unit 1, an output total power detection control circuit 2 and a PFC control chip 3;

[0038] An input voltage detection control unit 1 detects the AC input voltage value of the PFC circuit and, based on the set segmented voltage value range to which the AC input voltage value belongs, outputs a segmented voltage adjustment instruction to the PFC control chip 3 to reduce the voltage difference between the output voltage of the PFC circuit and the AC input voltage;

[0039] The output total power detection control circuit 2 outputs a control instruction based on the detection and judgment result of the total output power of the PFC circuit: if the value of the total output power exceeds the set power threshold, the PFC circuit shutdown instruction is output to the PFC control chip 3; otherwise, the PFC circuit is turned on and off.

[0040] Slice 3;

[0041] The PFC control chip 3 adjusts the output voltage of the PFC circuit according to the segmented voltage adjustment instruction, controls the PFC circuit to be turned off according to the PFC circuit off instruction, and controls the PFC circuit to be turned on according to the PFC circuit on instruction. The instructions for controlling the PFC circuit to be turned off and on have a higher priority than the instructions for adjusting the output voltage of the PFC circuit;

[0042] Among them, such as Figure 1 、 Figure 4 and Figure 5As shown, the PFC circuit 4 may include: an EMC and rectifier filter circuit 40, a PFC inductor 41, a PFC freewheeling diode 42, and a filter circuit 43. The PFC circuit 4 also includes a PFC switch 44, which is connected to the PFC control chip 3, the PFC freewheeling diode 42, and the filter circuit 43, and is used to control the PFC circuit to be turned on and off and to adjust the output voltage according to the instructions of the PFC control chip 3; an input voltage detection control unit 1, which detects the AC input voltage value of the input to the PFC circuit from the EMC and rectifier filter circuit; the back end of the filter circuit 43 is connected to the DC conversion protocol control circuit 5; the detection and judgment of the total output power of the PFC circuit are performed by the protocol chip of the DC conversion protocol control circuit;

[0043] The operating principle of the PFC circuit described above: After the AC voltage passes through the EMC circuit composed of F1, LF1, and LF2, it is rectified by BD1 and BD2 and filtered by π-type filters by CB1, L1, and CB2, converting it into a stable DC voltage. The PFC control chip U1 controls the switching state of the switch Q1 (NV6127) according to the different PFC_Vout required voltages. After filtering by EC1 / EC2 / EC3, the corresponding PFC_Vout high voltage is obtained. Pin 6FB of U1 is the control pin for the PFC_Vout voltage and is also the control pin for implementing the segmented boost of the PFC circuit and the PFC on / off control described in this invention.

[0044] It should be noted that the PFC circuit is not limited to the above-mentioned circuit structure, and other existing PFC circuits may also be used. The output power aggregation is not necessarily collected by the protocol chip (DC conversion protocol control circuit 5), and other collection chips may also be used for implementation, and there is no limitation on this.

[0045] The specific circuit and implementation principle of input voltage detection and output power control are introduced as follows:

[0046] like Figure 2As shown, the input voltage detection control unit 1 includes a first AC voltage input terminal AC1, a second AC voltage input terminal AC2, a first diode D4, a second diode D5, a third diode D6, a first resistor R11, a second resistor R12, a third resistor R13, a fourth resistor R14, a fifth resistor R15, a sixth resistor R17, a seventh resistor R16, a voltage stabilizing diode ZD2, a first capacitor C13 and a first N-channel MOS transistor Q2; the anodes of the first diode D4 and the second diode D5 are connected to the first AC voltage input terminal AC1 and the second AC voltage input terminal AC2 respectively, the cathodes of the first diode D4 and the second diode D5 are both connected to one end of the first resistor R11, and the other end of the first resistor R11 is connected in series with the second resistor R12, the third resistor R13 and the seventh resistor R16 in sequence. Four resistors R14, one end of the fourth resistor R14 connected to the third resistor R13 is connected to the anode of the third diode D6, the cathode of the third diode D6 is connected to the cathode of the Zener diode ZD2, and the anode of the Zener diode ZD2 is connected to the G electrode of the first N-channel MOS transistor Q2; the other end of the fourth resistor R14 is connected in parallel to the fifth resistor R15, the sixth resistor R17, and the first capacitor C13, and the other end of the fourth resistor R14 is grounded; the other end of the fifth resistor R15 and the other end of the first capacitor C13 are both connected to the G electrode of the first N-channel MOS transistor Q2, the other end of the sixth resistor R17 is connected to the S electrode of the first N-channel MOS transistor Q2, the D electrode of the first N-channel MOS transistor Q2 is connected to the seventh resistor R16, and the other end of the seventh resistor R16 is connected to the PFC control chip;

[0047] After the product is turned on, the AC voltage at the input terminals AC1 and AC2 is full-wave rectified by D4 and D5, and then divided by R11, R12, R13 (the combination of these three resistors can be replaced by other existing voltage divider resistors, without limitation) and R14. After passing through diode D6, a sampling voltage is given to ZD2. When the AC voltage at the input terminal increases to more than 210VAC, the sampling voltage at this position also increases synchronously. When it reaches the breakdown threshold voltage of ZD2 of 5.1V, ZD2 reversely breaks down, and the N-tube MOSQ2 is triggered to turn on. R16 & R17 act as the lower bias resistor and together with the resistor R7 (such as Figure 4 As shown, the PFC control chip 3 is U1, and its FB pin is connected in parallel with R7 and the FB PFC port. The FB PFC port is connected in parallel with R16 and R22, which reduces the total bias resistance of the enable pin, causing the voltage of the pin FB_PFC to be pulled down. The chip immediately operates to increase the voltage PFC Vout from 280VDC to 390VDC.

[0048] Similarly, when the AC voltage at the input drops below 210VAC, the sampling voltage also decreases synchronously. The voltage across diode D6 is insufficient to reversely breakdown Zener diode ZD2, turning off MOS tube Q2. R16 & R17 are disconnected from the parallel connection with resistor R7, and the total bias resistance increases, causing the voltage of the chip's enable pin FB_PFC to increase, and the PFC Vout voltage drops from 390VDC to 280VDC.

[0049] like Figure 3 As shown, the output total power detection control circuit includes a signal input terminal (i.e., the protocol chip EN), an eighth resistor R18, a ninth resistor R19, a second N-channel MOS transistor Q3, a tenth resistor R21, an eleventh resistor R20, an output voltage input terminal (i.e., the Vout bus), an optocoupler U2, a twelfth resistor R24, a thirteenth resistor R22, a fourteenth resistor R23, a second capacitor C14, and a third N-channel MOS transistor Q4;

[0050] The signal input terminal is connected in series with the eighth resistor R18 and the ninth resistor R19 in sequence. The other end of the ninth resistor R19 is connected to the S electrode of the second N-channel MOS transistor Q3 and grounded. The end connected to the eighth resistor R18 and the ninth resistor R19 is connected to the G electrode of the second N-channel MOS transistor Q3. The D electrode of the second N-channel MOS transistor Q3 is connected to the tenth resistor R21 and the K electrode of the optocoupler U2. The other end of the tenth resistor R21 is connected to the eleventh resistor R20 and the A electrode of the optocoupler U2. The other end of the eleventh resistor R20 is connected to the input The output voltage input terminal is connected; the C pole of the optocoupler U2 is connected to the twelfth resistor R24, the second capacitor C14 and the G pole of the third N-channel MOS transistor Q4, the S pole of the third N-channel MOS transistor Q4 is connected to the fourteenth resistor R23, the E pole of the optocoupler is connected to the other end of the twelfth resistor R24, the other end of the second capacitor C14 and the other end of the fourteenth resistor R23 and are grounded, the D pole of the third N-channel MOS transistor Q4 is connected to the thirteenth resistor R22, and the other end of the thirteenth resistor R22 is connected to the PFC control chip.

[0051] The product outputs various voltages within a range tailored to the needs of the powered device. When the combined power of all C&A output ports is less than 65W, the protocol chip's EN pin provides a low-level signal, turning off MOS tube Q3 and optocoupler U2. The power is transmitted to the primary side through the optocoupler, and MOS tube Q4 is turned off. Because R22 and R23 are connected in parallel with resistor R7 on the PFC driver chip's FB pin, when Q4 is disconnected, the total parallel resistance of R22, R23, and R7 increases, and the voltage on the FB pin rises to the threshold that triggers the PFC circuit to shut down, thereby shutting down the PFC. This avoids energy loss in the PFC circuit when the total output power is below 65W.

[0052] When the protocol chip detects that the total power of all output ports is above 65W, it will provide a high-level signal, MOS tube Q3 will be turned on, optocoupler U2 will light up, MOS tube Q4 will be turned on, resistors R22, R23 and R7 will be connected in parallel, the total parallel bias resistance will decrease, the voltage of the chip FB pin will decrease, and the PFC circuit will resume normal operation.

[0053] This invention detects the input AC voltage level to achieve a step-by-step boost in PFC Vout. When the input voltage is detected to be between 90V and 210VAC, PFC Vout is boosted to 280VDC, with a voltage difference of 280V - 90*1.414 = 152.74VDC. When the input voltage is detected to be between 210V and 264VAC, PFC Vout is boosted to 390VDC, with a voltage difference of 390V - 210*1.414 = 93.06VDC. This voltage difference is very small. This step-by-step boost provides a prerequisite for improving product efficiency.

[0054] Furthermore, the present invention determines whether the PFC circuit is enabled or disabled by detecting the voltage at the output terminals and the total output power of all output ports. This activation is indicated by the MCU on the product's protocol side. When all output ports (including ports C and A) are detected to be 5V, the main conversion circuit's conversion efficiency is at its lowest, and the PFC circuit must be disabled to reduce losses. When the total output power of all output ports exceeds 65W, the PFC circuit is enabled to ensure the product's PF value remains within the specified range.

[0055] In summary, this patent addresses the energy efficiency issue by combining the input and output characteristics of PD products. This allows the product to meet the Level VI energy efficiency requirements in any combination, regardless of input range of 90VAC to 264VAC or output range of 3.3V to 28V, 0A to 5A. This not only addresses the issue of regional restrictions on product sales and use, but also significantly reduces product temperature due to improved energy efficiency. Figure 6 and Figure 7 According to experimental verification data, when the present invention is applied in an actual circuit, the efficiency of the product can be improved by 1.4% and the shell temperature of the product can be reduced by 9°C.

[0056] A PD product is provided with the PFC enabling control circuit as described above for use in the PD product.

[0057] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A PFC enable control circuit applied to PD products, characterized in that: It includes input voltage detection control unit, output total power detection control circuit and PFC control chip; The input voltage detection control unit detects the AC input voltage value input to the PFC circuit and, based on the set segmented voltage value range to which the AC input voltage value belongs, outputs a segmented voltage adjustment instruction to the PFC control chip to reduce the voltage difference between the output voltage of the PFC circuit and the AC input voltage; The output total power detection control circuit outputs a control instruction based on the detection and judgment result of the total output power of the PFC circuit: if the total output power exceeds the set power threshold, the circuit outputs a PFC circuit shutdown instruction to the PFC control chip; otherwise, the circuit outputs a PFC circuit startup instruction to the PFC control chip; The PFC control chip adjusts the output voltage of the PFC circuit according to the segmented voltage adjustment instruction, controls the PFC circuit to be turned off according to the PFC circuit turn-off instruction, and controls the PFC circuit to be turned on according to the PFC circuit turn-on instruction. The instructions for controlling the PFC circuit to be turned off and on have a higher priority than the instructions for adjusting the output voltage of the PFC circuit.

2. The PFC enabling control circuit for PD products according to claim 1, characterized in that: The step of outputting a segmented voltage adjustment instruction for reducing the voltage difference between the output voltage of the PFC circuit and the AC input voltage to the PFC control chip based on the set segmented voltage value range to which the AC input voltage value belongs comprises: When the AC input voltage exceeds the set voltage threshold, the pin voltage of the corresponding PFC control chip is pulled down; When the AC input voltage does not exceed the set voltage threshold, the pin voltage of the corresponding PFC control chip is pulled high.

3. The PFC enabling control circuit for PD products according to claim 2, characterized in that: The input voltage detection control unit includes a first AC voltage input terminal, a second AC voltage input terminal, a first diode, a second diode, a third diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a voltage stabilizing diode, a first capacitor and a first N-channel MOS transistor; The anodes of the first diode and the second diode are connected to the first AC voltage input terminal and the second AC voltage input terminal, respectively. The cathodes of the first diode and the second diode are both connected to one end of the first resistor. The other end of the first resistor is connected in series with the second resistor, the third resistor, and the fourth resistor in sequence. The end of the fourth resistor connected to the third resistor is connected to the anode of the third diode, the cathode of the third diode is connected to the cathode of the Zener diode, and the anode of the Zener diode is connected to the G electrode of the first N-channel MOS transistor. The other end of the fourth resistor is connected in parallel with the fifth resistor, the sixth resistor, and the first capacitor, and the other end of the fourth resistor is grounded. The other end of the fifth resistor and the other end of the first capacitor are both connected to the G electrode of the first N-channel MOS transistor. The other end of the sixth resistor is connected to the S electrode of the first N-channel MOS transistor. The D electrode of the first N-channel MOS transistor is connected to the seventh resistor, and the other end of the seventh resistor is connected to the PFC control chip.

4. The PFC enabling control circuit for PD products according to claim 2, characterized in that: The set voltage threshold is 210VAC; When the pin connecting the PFC control chip and the input voltage detection control unit is pulled low, the output voltage of the PFC circuit is controlled to increase from 280VDC to 390VDC; When the pin connecting the PFC control chip and the input voltage detection control unit is pulled high, the output voltage of the PFC circuit is controlled to drop from 390 VDC back to 280 VDC.

5. The PFC enabling control circuit for PD products according to claim 1, characterized in that: The output total power detection control circuit includes a signal input terminal, an eighth resistor, a ninth resistor, a second N-channel MOS transistor, a tenth resistor, an eleventh resistor, an output voltage input terminal, an optocoupler, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a second capacitor and a third N-channel MOS transistor; The signal input terminal is sequentially connected to the eighth resistor and the ninth resistor. The other end of the ninth resistor is connected to the S pole of the second N-channel MOS transistor and is grounded. The end of the eighth resistor connected to the ninth resistor is connected to the G pole of the second N-channel MOS transistor. The D pole of the second N-channel MOS transistor is connected to the tenth resistor and the K pole of the optocoupler. The other end of the tenth resistor is connected to the eleventh resistor and the A pole of the optocoupler. The other end of the eleventh resistor is connected to the output voltage input terminal. The C pole of the optocoupler is connected to the twelfth resistor, the second capacitor, and the G pole of the third N-channel MOS transistor. The S pole of the third N-channel MOS transistor is connected to the fourteenth resistor. The E pole of the optocoupler is connected to the other end of the twelfth resistor, the other end of the second capacitor, and the other end of the fourteenth resistor and are grounded. The D pole of the third N-channel MOS transistor is connected to the thirteenth resistor. The other end of the thirteenth resistor is connected to the PFC control chip.

6. The PFC enabling control circuit for PD products according to claim 1, characterized in that: The set power threshold is 65W.

7. The PFC enable control circuit for PD products according to any one of claims 1 to 6, characterized in that: The PFC circuit includes an EMC and rectification filter circuit, a PFC inductor, a PFC freewheeling diode, and a filter circuit. The PFC circuit also includes a PFC switch tube. The PFC switch tube is connected to the PFC control chip, the PFC freewheeling diode, and the filter circuit, and is used to control the PFC circuit to be turned on and off and to adjust the output voltage according to instructions from the PFC control chip.

8. The PFC enabling control circuit for PD products according to claim 7, characterized in that: The input voltage detection control unit detects an AC input voltage value of the PFC circuit that is derived from the EMC and rectifier filter circuit.

9. The PFC enabling control circuit for PD products according to claim 7, characterized in that: The rear end of the filter circuit is connected to a DC conversion protocol control circuit; The detection and judgment of the total output power of the PFC circuit are performed by the protocol chip of the DC conversion protocol control circuit.

10. A PD product, characterized in that: The PD product is provided with a PFC enabling control circuit applied to a PD product as described in any one of claims 1 to 9.

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