A power supply circuit and a device powered based on POC

Abstract

The application provides a power supply circuit and a POC power supply-based device, the power supply circuit comprising a power supply chip, a feedback network module and a slope control module; the slope control module can output a boost signal or a buck signal with a preset slope and a preset time length, the feedback network module generates a load current signal with a slope according to the boost / buck signal and a feedback voltage with a fixed voltage value, the slope value of the load current signal is related to the slope of the boost / buck signal, so that the slope of the load current signal can be adjusted according to the slope control module, and the interference of a large-slope load current on a high-speed data signal can be reduced.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a power supply circuit and a device based on POC power supply. Background Technology

[0002] Power on Coax (POC) is a technology that simultaneously supplies power and transmits data over a coaxial cable. POC technology is widely used, such as for powering camera devices and display devices.

[0003] POC power supply uses passive filtering to isolate high-speed data transmission from DC power. Common high-speed data transmission technologies include Flat Panel Display Link (FPD-LINK) and Gigabit Multimedia Serial Links (GMSL), with transmission rates up to several Gbps and signal amplitudes typically in the hundreds of mV range. If the device's load current fluctuates significantly, the limited isolation of the passive filter can lead to substantial power interference superimposed on the data link, resulting in high-speed data transmission errors or connection drops, ultimately causing device malfunction. Summary of the Invention

[0004] This application provides a power supply circuit and a device based on POC power supply to reduce interference to high-speed data signals caused by high-slope load current in POC-powered devices.

[0005] In a first aspect, embodiments of this application provide a power supply circuit, including: a power supply chip, a feedback network module, and a slope control module; The input terminal of the power chip is used to receive the input power supply voltage. The output terminal of the power chip is connected to the first terminal of the load. The feedback terminal of the power chip is connected to the first terminal of the feedback network module and the first terminal of the slope control module. The second terminal of the feedback network module is connected to the second terminal of the load, and the third terminal of the feedback network module is grounded. The second terminal of the slope control module is grounded, the third terminal of the slope control module is connected to the power supply terminal, and the fourth terminal of the slope control module is used to receive the load enable signal. The power chip is used to convert the input power supply voltage into the output power supply voltage required by the load, and to provide a feedback voltage that approaches a fixed voltage value. The slope control module is configured to receive the load enable signal, and when the load enable signal switches from invalid to valid, to open the path between the third terminal and the second terminal of the slope control module so that the first terminal of the slope control module outputs a buck signal with a preset slope and a preset duration; and when the load enable signal switches from valid to invalid, to disconnect the path between the third terminal and the second terminal of the slope control module so that the first terminal of the slope control module outputs a boost signal with the preset slope and the preset duration. The feedback network module is used to generate a load current signal with a negative slope based on the boost signal and the feedback voltage, and to generate a load current signal with a positive slope based on the buck signal and the feedback voltage.

[0006] Optionally, the slope control module includes an on / off unit, a charging unit, a discharging unit, an isolation unit, and a stabilization unit; The first end of the switching unit serves as the second end of the slope control module and is connected to the first end of the charging unit and the first end of the discharging unit, respectively. The second end of the switching unit serves as the fourth end of the slope control module, and the third end of the switching unit is connected to the second end of the charging unit. The third end of the charging unit is connected to the first end of the isolation unit, and the fourth end of the charging unit serves as the third end of the slope control module. The second end of the isolation unit is connected to the second end of the discharging unit and the first end of the stabilizing unit, respectively. The second end of the stabilizing unit serves as the first end of the slope control module. The switching unit is used to receive the load enable signal, and when the load enable signal switches from invalid to valid, to open the path between the third terminal and the first terminal of the switching unit, and when the load enable signal switches from valid to invalid, to disconnect the path between the third terminal and the first terminal of the switching unit. The charging unit is used to perform charging processing after the path between the third terminal and the first terminal of the switching unit is broken, so that the first terminal of the slope control module outputs the boost signal. The discharge unit is used to perform discharge processing after the path between the third terminal and the first terminal of the switching unit is turned on, so that the first terminal of the slope control module outputs the step-down signal. The isolation unit is used to isolate the charging unit and the discharging unit; The stabilizing unit is used to stabilize the boost signal and the buck signal.

[0007] Optionally, the switching unit includes a first resistor and a first switching transistor; The first end of the first resistor serves as the second end of the switching unit, and the second end of the first resistor is connected to the control terminal of the first switching transistor. The first end of the first switching transistor serves as the first end of the switching unit, and the second end of the first switching transistor serves as the third end of the switching unit.

[0008] Optionally, the charging unit includes a second resistor, a third resistor, and a first capacitor; The first end of the second resistor serves as the fourth end of the charging unit, and the second end of the second resistor serves as the second end of the charging unit, and is connected to the first end of the third resistor. The second end of the third resistor serves as the third end of the charging unit and is connected to the first end of the first capacitor. The second end of the first capacitor serves as the first end of the charging unit.

[0009] Optionally, the discharge unit includes a fourth resistor and a second capacitor; The first end of the fourth resistor serves as the first end of the discharge unit and is connected to the first end of the second capacitor. The second end of the fourth resistor serves as the second end of the discharge unit and is connected to the second end of the second capacitor.

[0010] Optionally, the isolation unit includes a first diode; The anode of the first diode serves as the first end of the isolation unit, and the cathode of the first diode serves as the second end of the isolation unit.

[0011] Optionally, the stabilizing unit includes a fifth resistor; The first end of the fifth resistor serves as the first end of the stabilizing unit, and the second end of the fifth resistor serves as the second end of the stabilizing unit.

[0012] Optionally, the feedback network module includes: a sixth resistor and a seventh resistor; The first end of the sixth resistor serves as the first end of the feedback network module, and the second end of the sixth resistor serves as the second end of the feedback network module, and is connected to the first end of the seventh resistor. The second end of the seventh resistor serves as the third end of the feedback network module.

[0013] Optionally, a third capacitor may also be included; The first terminal of the third capacitor is connected to the input terminal of the power chip, and the second terminal of the third capacitor is grounded.

[0014] Secondly, embodiments of this application also provide a device based on POC power supply, including a power supply circuit as described in any of the first aspects.

[0015] This application provides a power supply circuit and a device based on POC power supply. The power supply circuit includes: a power chip, a feedback network module, and a slope control module. The input terminal of the power chip is used to receive an input power supply voltage, the output terminal of the power chip is connected to a first terminal of the load, and the feedback terminal of the power chip is connected to both the first terminal of the feedback network module and the first terminal of the slope control module. The second terminal of the feedback network module is connected to the second terminal of the load, and the third terminal of the feedback network module is grounded. The second terminal of the slope control module is grounded, the third terminal of the slope control module is connected to the power supply terminal, and the fourth terminal of the slope control module is used to receive a load enable signal. The power chip is used to convert the input power supply voltage into the output power supply voltage required by the load and provide... The feedback voltage approaches a fixed voltage value; the slope control module receives the load enable signal, and when the load enable signal switches from invalid to valid, it opens the path between the third and second terminals of the slope control module so that the first terminal of the slope control module outputs a buck signal with a preset slope and a preset duration, and when the load enable signal switches from valid to invalid, it disconnects the path between the third and second terminals of the slope control module so that the first terminal of the slope control module outputs a boost signal with a preset slope and a preset duration; the feedback network module generates a load current signal with a negative slope based on the boost signal and the feedback voltage, and generates a load current signal with a positive slope based on the buck signal and the feedback voltage. The power supply circuit provided in this application embodiment can output a boost or buck signal with a preset slope and preset duration by a slope control module. The feedback network module generates a load current signal with a slope based on the boost / buck signal and a feedback voltage that approaches a fixed voltage value. The slope value of the load current signal is related to the slope of the boost / buck signal. Therefore, the slope of the load current signal can be adjusted according to the slope control module, thereby reducing the interference of high-speed data signals caused by large-slope load current in POC-powered devices. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the basic architecture of a POC-powered device in the prior art; Figure 2 A schematic diagram of a power supply circuit provided in an embodiment of this application; Figure 3 This application provides a schematic diagram of the operating waveform of a power supply circuit according to an embodiment of the present application. Figure 4 This is a schematic diagram of another power supply circuit provided in an embodiment of this application; Figure 5 This is a schematic diagram of another power supply circuit provided in an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art are within the scope of protection of this application.

[0019] like Figure 1 The diagram shows the basic architecture of a POC-based power supply device in the prior art, including a coaxial connector, a passive low-pass filter module, a power supply module, a load module, a passive high-pass filter module, and a data processing module. The coaxial connector transmits both high-speed communication data and power. The passive low-pass filter module presents a high-impedance state for high-speed data signals, allowing only power to pass through; the passive high-pass filter module presents a high-impedance state for DC power signals, allowing only high-speed data signals to pass through.

[0020] Passive low-pass and passive high-pass filter modules are typically implemented using passive filters. While passive filters are inexpensive, their performance is limited. When the load current amplitude and rate of change are large, interference signals caused by these load current variations can penetrate the passive low-pass and high-pass filter modules and interfere with the data processing module, leading to increased data communication error rates or even communication link establishment failure. Currently, the current suddenly increases when the load is turned on and disappears instantly when the load is turned off. This control method results in a large rate of change in load current, which can easily affect the communication of devices powered by POC (Power over Charge).

[0021] To address the aforementioned problems, embodiments of this application provide a power supply circuit for... Figure 1 The power supply module shown has been improved to control the slope (rate of change) of the load current, thereby avoiding interference from the high-speed data signal caused by the large slope current of the load.

[0022] like Figure 2 As shown, a power supply circuit provided in an embodiment of this application includes: a power supply chip 201, a feedback network module 202, and a slope control module 203; The input terminal Vin of the power chip 201 is used to receive the input power supply voltage. The output terminal Vout of the power chip 201 is connected to the first terminal of the load. The feedback terminal FB of the power chip 201 is connected to the first terminal of the feedback network module 202 and the first terminal of the slope control module 203 respectively. The second terminal of the feedback network module 202 is connected to the second terminal of the load, and the third terminal of the feedback network module 202 is grounded. The second terminal of the slope control module 203 is grounded, the third terminal of the slope control module 203 is connected to the power supply terminal VCC, and the fourth terminal of the slope control module 203 is used to receive the load enable signal EN. Power chip 201 is used to convert the input power supply voltage into the output power supply voltage required by the load and to provide a feedback voltage V that approximates a fixed voltage value. FB ; The slope control module 203 is used to receive the load enable signal EN. When the load enable signal EN switches from invalid to valid, the path between the third terminal and the second terminal of the slope control module 203 is opened, so that the first terminal of the slope control module 203 outputs a buck signal with a preset slope and a preset duration. When the load enable signal switches from valid to invalid, the path between the third terminal and the second terminal of the slope control module 203 is closed, so that the first terminal of the slope control module 203 outputs a boost signal with a preset slope and a preset duration. Feedback network module 202 is used to generate a load current signal with a negative slope based on the boost signal and the feedback voltage, and to generate a load current signal with a positive slope based on the buck signal and the feedback voltage. The load current signal is the current signal flowing through the load.

[0023] The power supply circuit provided in this application embodiment can output a boost or buck signal with a preset slope and preset duration by a slope control module. The feedback network module generates a load current signal with a slope based on the boost / buck signal and a feedback voltage that approaches a fixed voltage value. The slope value of the load current signal is related to the slope of the boost / buck signal. Therefore, the slope of the load current signal can be adjusted according to the slope control module, thereby reducing the interference of high-speed data signals caused by large-slope load current in POC-powered devices.

[0024] like Figure 3 The diagram shown is a schematic of the operating waveforms of the power supply circuit provided in this embodiment. When the load is off, the load enable signal is a low-level voltage signal. At the instant the load switches from off to on, the load enable signal switches from a low-level voltage signal to a high-level voltage signal. At this time, the slope control module outputs a step-down signal, and the corresponding load current slowly increases. At the instant the load switches from on to off, the load enable signal switches from a high-level voltage signal to a low-level voltage signal. At this time, the slope control module outputs a step-up signal, and the corresponding load current slowly decreases.

[0025] This application adds a load current slope control function to the power supply circuit. The power supply circuit includes a power supply chip, a feedback network module, and a slope control module. The power supply chip is used to convert the input power supply voltage into the power supply voltage required by the load; the feedback network module is used to adjust the output voltage value of the power supply chip so that the feedback voltage at the feedback terminal of the voltage chip is maintained at a fixed value; the slope control module is used to receive the load enable control signal and act on the FB pin of the power supply chip to realize the load current increasing or decreasing at a certain slope.

[0026] The slope control module 203 receives the load enable signal EN and converts it into an output voltage signal (i.e., a boost signal or a buck signal) with a certain slope. This signal is then applied to the FB pin of the power supply chip 201. Upon receiving the boost or buck signal from the slope control module 203, the FB pin of the power supply chip adjusts the load current accordingly, causing the load current to turn on and off at a certain slope. The calculation relationship between the load current and the output voltage of the slope control module 203 is shown in the following formula:

[0027] Among them, V FB The reference voltage (i.e., feedback voltage) for the power chip 201 is a fixed value; S out The slope control module 203 outputs the voltage value; F(x) is the load current adjustment coefficient, determined by the feedback network module 202, where x is the load current. Therefore, the load current calculation formula is as follows.

[0028]

[0029] For ease of understanding, a camera with a strobe LED powered by a point-of-care (POC) circuit is used as a specific example for explanation. The camera's strobe LED activation time is synchronized with the camera's exposure time. The instantaneous activation and deactivation of the strobe LED generate significant increases and decreases in load current, which can interfere with data communication and cause communication link establishment failures. The power supply circuit provided in this application embodiment can solve the above problem.

[0030] In specific implementation, such as Figure 4 As shown, the slope control module 203 may include an on / off unit 2031, a charging unit 2032, a discharging unit 2033, an isolation unit 2034, and a stabilization unit 2035; The first end of the switching unit 2031 serves as the second end of the slope control module 203 and is connected to the first end of the charging unit 2032 and the first end of the discharging unit 2033, respectively. The second end of the switching unit 2031 serves as the fourth end of the slope control module 203, and the third end of the switching unit 2031 is connected to the second end of the charging unit 2032. The third end of the charging unit 2032 is connected to the first end of the isolation unit 2034, and the fourth end of the charging unit 2032 serves as the third end of the slope control module 203. The second end of the isolation unit 2034 is connected to the second end of the discharging unit 2033 and the first end of the stabilizing unit 2035, respectively. The second end of the stabilizing unit 2035 serves as the first end of the slope control module 203. The switching unit 2031 is used to receive the load enable signal EN, and when the load enable signal switches from invalid to valid, it opens the path between the third terminal and the first terminal of the switching unit 2031, and when the load enable signal switches from valid to invalid, it closes the path between the third terminal and the first terminal of the switching unit 2031. The charging unit 2032 is used to perform charging processing after the path between the third terminal and the first terminal of the on / off unit 2031 is broken, so that the first terminal of the slope control module 203 outputs a boost signal. The discharge unit 2033 is used to perform discharge processing after the path between the third terminal and the first terminal of the on / off unit 2031 is turned on, so that the first terminal of the slope control module 203 outputs a stepped-down signal. The isolation unit 2034 is used to isolate the charging unit 2032 and the discharging unit 2033; The stabilization unit 2035 is used to stabilize boost and buck signals.

[0031] More specifically, such as Figure 5 As shown, the switching unit 2031 may include a first resistor R1 and a first switching transistor Q1; The first end of the first resistor R1 serves as the second end of the switching unit 2031, and the second end of the first resistor R1 is connected to the control end of the first switching transistor Q1. The first end of the first switch Q1 serves as the first end of the switching unit 2031, and the second end of the first switch Q1 serves as the third end of the switching unit 2031.

[0032] The charging unit 2032 may include a second resistor R2, a third resistor R3, and a first capacitor C1; The first end of the second resistor R2 serves as the fourth end of the charging unit 2032, and the second end of the second resistor R2 serves as the second end of the charging unit 2032, and is connected to the first end of the third resistor R3. The second end of the third resistor R3 serves as the third end of the charging unit 2032 and is connected to the first end of the first capacitor C1. The second terminal of the first capacitor C1 serves as the first terminal of the charging unit 2032.

[0033] The discharge unit 2033 may include a fourth resistor R4 and a second capacitor C2; The first end of the fourth resistor R4 serves as the first end of the discharge unit 2033 and is connected to the first end of the second capacitor C2. The second end of the fourth resistor R4 serves as the second end of the discharge unit 2033 and is connected to the second end of the second capacitor C2.

[0034] The isolation unit 2034 may include a first diode; The anode of the first diode serves as the first terminal of the isolation unit 2034, and the cathode of the first diode serves as the second terminal of the isolation unit 2034.

[0035] The stabilizing unit 2035 may include a fifth resistor R5; The first end of the fifth resistor R5 serves as the first end of the stabilizing unit 2035, and the second end of the fifth resistor R5 serves as the second end of the stabilizing unit 2035.

[0036] Feedback network module 202 includes: a sixth resistor R6 and a seventh resistor R7; The first end of the sixth resistor R6 serves as the first end of the feedback network module 202, and the second end of the sixth resistor R6 serves as the second end of the feedback network module 202, and is connected to the first end of the seventh resistor R7. The second terminal of the seventh resistor R7 serves as the third terminal of the feedback network module 202.

[0037] In addition, a third capacitor C3 may be included; the first terminal of the third capacitor C3 is connected to the input terminal of the power supply chip 201, and the second terminal of the third capacitor C3 is grounded. A fourth capacitor C4 and a first inductor L1 are also included. The first inductor L1 is connected between the output terminal Vout of the power supply chip 201 and the first terminal of the load. The first terminal of the fourth capacitor C4 is connected to the first terminal of the load, and the second terminal of the fourth capacitor C4 is grounded. These capacitors and inductors are used for filtering.

[0038] This application adds a slope control module 203 to a conventional LED constant current power supply circuit, causing the LED current to rise at a set slope when the LED is turned on and fall at a set slope when the LED is turned off. The input of the slope control module 203 is EN, the enable control signal for the load LED. The on / off unit 2031 includes R1 and Q1. When EN switches from low to high, Q1 conducts, C1 discharges through R3 and Q1, and C2 discharges through R4. At this time, the voltage input to the power chip FB terminal through R5 decreases, meaning R5 outputs a step-down signal with a preset slope and preset duration. Since the feedback voltage value at the power chip FB terminal is fixed, the voltage input to the power chip FB through R6 in the feedback network module 202 increases, causing the load LED current to rise at the set slope. When EN switches from high to low, Q1 is turned off. At this time, VCC charges C1 through R2 and R3, and simultaneously charges C2 through D1. The voltage input to the power chip FB through R5 increases, meaning R5 outputs a boost signal with a preset slope and preset duration. Since the feedback voltage at the power chip FB is fixed, the voltage input to the power chip 201FB through R6 in the feedback network module 202 decreases. This causes the current to decrease at the load LED with a preset slope and preset duration. The specific preset slope and preset duration are related to the values ​​of the resistors and capacitors in the slope control module 203, and can be set according to actual needs.

[0039] The formula for calculating the load current of a load LED is as follows.

[0040]

[0041] Among them, V FB Sout is the reference voltage (feedback voltage) of the power supply chip 201, which is a fixed value; Sout is the output voltage (boost signal or buck signal) of the slope control module 203. Since R5, R6, and R7 are all fixed values, the LED load current I... LED The output voltage Sout of the slope control module 203 is linearly negatively correlated, meaning that Sout rises with a certain slope. LED Then it decreases with a certain slope; Sout decreases with a certain slope, I LED It then rises at a certain slope.

[0042] This application eliminates the interference of POC power supply to the data link by controlling the load current slope using existing low-cost passive filters, without the need for more expensive and higher-performance filtering schemes, thus resulting in a low-cost solution. Furthermore, this application eliminates the interference of POC power supply to the data link by controlling the load current slope without changing the original data control and power control methods of the equipment, requiring no complex control methods or special adaptations for the peer equipment, thus simplifying implementation and enhancing adaptability. Finally, this application ensures that data communication can continue while power transmission is being performed, without sacrificing communication bandwidth.

[0043] Based on the same concept, this application also provides a device based on POC power supply. The implementation of this device can refer to the implementation of the power supply circuit described above, and the repeated parts will not be described again.

[0044] Those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A power supply circuit, characterized in that, include: Power supply chip, feedback network module, and slope control module; The input terminal of the power chip is used to receive the input power supply voltage. The output terminal of the power chip is connected to the first terminal of the load. The feedback terminal of the power chip is connected to the first terminal of the feedback network module and the first terminal of the slope control module. The second terminal of the feedback network module is connected to the second terminal of the load, and the third terminal of the feedback network module is grounded. The second terminal of the slope control module is grounded, the third terminal of the slope control module is connected to the power supply terminal, and the fourth terminal of the slope control module is used to receive the load enable signal. The power chip is used to convert the input power supply voltage into the output power supply voltage required by the load, and to provide a feedback voltage that approaches a fixed voltage value. The slope control module is configured to receive the load enable signal, and when the load enable signal switches from invalid to valid, to open the path between the third terminal and the second terminal of the slope control module so that the first terminal of the slope control module outputs a buck signal with a preset slope and a preset duration; and when the load enable signal switches from valid to invalid, to disconnect the path between the third terminal and the second terminal of the slope control module so that the first terminal of the slope control module outputs a boost signal with the preset slope and the preset duration. The feedback network module is used to generate a load current signal with a negative slope based on the boost signal and the feedback voltage, and to generate a load current signal with a positive slope based on the buck signal and the feedback voltage.

2. The circuit as described in claim 1, characterized in that, The slope control module includes an on / off unit, a charging unit, a discharging unit, an isolation unit, and a stabilization unit; The first end of the switching unit serves as the second end of the slope control module and is connected to the first end of the charging unit and the first end of the discharging unit, respectively. The second end of the switching unit serves as the fourth end of the slope control module, and the third end of the switching unit is connected to the second end of the charging unit. The third end of the charging unit is connected to the first end of the isolation unit, and the fourth end of the charging unit serves as the third end of the slope control module. The second end of the isolation unit is connected to the second end of the discharging unit and the first end of the stabilizing unit, respectively. The second end of the stabilizing unit serves as the first end of the slope control module. The switching unit is used to receive the load enable signal, and when the load enable signal switches from invalid to valid, to open the path between the third terminal and the first terminal of the switching unit, and when the load enable signal switches from valid to invalid, to disconnect the path between the third terminal and the first terminal of the switching unit. The charging unit is used to perform charging processing after the path between the third terminal and the first terminal of the on / off unit is broken, so that the first terminal of the slope control module outputs the boost signal. The discharge unit is used to perform discharge processing after the path between the third terminal and the first terminal of the switching unit is turned on, so that the first terminal of the slope control module outputs the step-down signal. The isolation unit is used to isolate the charging unit and the discharging unit; The stabilizing unit is used to stabilize the boost signal and the buck signal.

3. The circuit as described in claim 2, characterized in that, The switching unit includes a first resistor and a first switching transistor; The first end of the first resistor serves as the second end of the switching unit, and the second end of the first resistor is connected to the control terminal of the first switching transistor. The first end of the first switching transistor serves as the first end of the switching unit, and the second end of the first switching transistor serves as the third end of the switching unit.

4. The circuit as described in claim 2, characterized in that, The charging unit includes a second resistor, a third resistor, and a first capacitor; The first end of the second resistor serves as the fourth end of the charging unit, and the second end of the second resistor serves as the second end of the charging unit, and is connected to the first end of the third resistor. The second end of the third resistor serves as the third end of the charging unit and is connected to the first end of the first capacitor. The second end of the first capacitor serves as the first end of the charging unit.

5. The circuit as described in claim 2, characterized in that, The discharge unit includes a fourth resistor and a second capacitor; The first end of the fourth resistor serves as the first end of the discharge unit and is connected to the first end of the second capacitor. The second end of the fourth resistor serves as the second end of the discharge unit and is connected to the second end of the second capacitor.

6. The circuit as described in claim 2, characterized in that, The isolation unit includes a first diode; The anode of the first diode serves as the first end of the isolation unit, and the cathode of the first diode serves as the second end of the isolation unit.

7. The circuit as described in claim 2, characterized in that, The stabilizing unit includes a fifth resistor; The first end of the fifth resistor serves as the first end of the stabilizing unit, and the second end of the fifth resistor serves as the second end of the stabilizing unit.

8. The circuit as described in claim 1, characterized in that, The feedback network module includes: a sixth resistor and a seventh resistor; The first end of the sixth resistor serves as the first end of the feedback network module, and the second end of the sixth resistor serves as the second end of the feedback network module, and is connected to the first end of the seventh resistor. The second end of the seventh resistor serves as the third end of the feedback network module.

9. The circuit as described in claim 1, characterized in that, It also includes a third capacitor; The first terminal of the third capacitor is connected to the input terminal of the power chip, and the second terminal of the third capacitor is grounded.

10. A device based on POC power supply, characterized in that, Includes the power supply circuit as described in any one of claims 1-9.

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