Ac-dc control module, non-isolated switching power supply, chip and electronic device

Abstract

The application relates to an AC-DC control module, a non-isolated switching power supply, a chip and an electronic device, the AC-DC control module comprising: a current shaping module, an input end of the current shaping module being configured to be connected with a power supply circuit, and an output end of the current shaping module being connected with an input end of a DC-DC control module; and the DC-DC control module, an output end of the DC-DC control module being an output end of the AC-DC control module; wherein a controlled end of the current shaping module is connected with the power supply circuit, an electrical signal representing an input voltage of the DC-DC control module can be sampled, and the current shaping module can control the size and waveform of the current output to the DC-DC control module based on the electrical signal. The application can provide stable direct-current voltage for power supply of a load without additional setting of a filter circuit, thereby reducing the cost and design complexity of the circuit.

Description

Technical Field

[0001] This invention relates to the field of chip technology, and more specifically to an AC-DC control module, a non-isolated switching power supply, a chip, and electronic equipment. Background Technology

[0002] In current low-voltage power supply equipment or low-voltage electronic equipment, AC-DC control modules are typically used to convert alternating current (AC) to direct current (DC) to achieve stable DC power supply. However, to suppress interference caused by mains power fluctuations and switching currents, traditional designs often add a filter, such as a π-type filter, between the mains input and the AC-DC control module. While this design can effectively filter out interference, it has the following shortcomings:

[0003] Higher cost: π-type filters typically require inductors and high-voltage capacitors, increasing the cost of the product.

[0004] Large size: Inductors and capacitors are large in size, taking up valuable space on the circuit board and hindering product miniaturization.

[0005] Therefore, it is necessary to improve the existing AC-DC control module. Summary of the Invention

[0006] In view of the shortcomings of existing technologies, this application proposes a novel AC-DC control module. This module aims to solve the problems of high cost and large size in traditional designs, and provide a more economical and compact power supply solution for small household appliances.

[0007] This invention provides an AC-DC control module, comprising: a current shaping module, the input terminal of which is configured to be connected to a power supply circuit, and the output terminal of which is connected to the input terminal of a DC-DC control module; and a DC-DC control module, the output terminal of which serves as the output terminal of the AC-DC control module; wherein, the controlled terminal of the current shaping module is connected to the power supply circuit, and is capable of sampling an electrical signal characterizing the input voltage of the DC-DC control module, and controlling the magnitude and waveform of the current output by the current shaping module to the DC-DC control module based on the electrical signal.

[0008] Optionally, the current shaping module includes: a withstand voltage circuit, including a first MOSFET M1; and a current shaping circuit, including a shaping circuit, an operational amplifier, a second MOSFET M2, and a first resistor R1; the drain of the first MOSFET M1 is configured to be connected to the power supply circuit, the gate of the first MOSFET M1 is configured to be connected to a reference voltage, the source of the first MOSFET M1 is connected to the drain of the second MOSFET M2, the output terminal of the shaping circuit is connected to the non-inverting input terminal of the operational amplifier, the inverting input terminal of the operational amplifier is connected to the source of the second MOSFET M2 and the first terminal of the first resistor R1, the output terminal of the operational amplifier is connected to the gate of the second MOSFET M2, and the second terminal of the first resistor R1 is configured to be connected to the input terminal of the DC-DC control module.

[0009] Optionally, the current shaping module includes a MOSFET M, a shaping circuit, and a gate drive circuit. The output terminal of the shaping circuit is connected to the input terminal of the gate drive circuit, the output terminal of the gate drive circuit is connected to the gate of the MOSFET M, the drain of the MOSFET M is configured to be connected to the power supply circuit, and the source of the MOSFET M is configured to be connected to the input terminal of the DC-DC control module.

[0010] Optionally, the AC-DC control module further includes a withstand voltage module, which is electrically connected to the current shaping module to improve the withstand voltage / load capacity of the current shaping module.

[0011] Optionally, the current shaping module is a controlled current source.

[0012] Optionally, the "controlling the current output from the current shaping module to the DC-DC control module" includes: modulating the current waveform output to the DC-DC control module such that, in each pulse cycle of the rectified AC power provided by the power supply circuit, the current near the trough is larger.

[0013] Optionally, the "controlling the current output from the current shaping module to the DC-DC control module" includes: modulating the current waveform output to the DC-DC control module so that the current magnitude is similar in each pulsation cycle of the rectified AC power provided by the power supply circuit, and changes accordingly with the change of the rectified AC power within the cycle.

[0014] Optionally, the "controlling the current output from the current shaping module to the DC-DC control module" further includes: modulating the current waveform output to the DC-DC control module so that the current decreases as the voltage increases within a voltage range near the peak of the rectified AC current.

[0015] To achieve the above-mentioned objectives, this application provides a non-isolated switching power supply, comprising: the AC-DC control module described above; a first energy storage circuit connected in parallel across the two ends of the DC-DC control module; and a step-down circuit connected to the output terminal of the DC-DC control module, capable of working with the DC-DC control module to reduce the voltage input to the DC-DC control module before outputting it.

[0016] Optionally, the step-down circuit includes: an inductor, the first end of which is connected to the control terminal / output terminal of the DC-DC control module; a second energy storage circuit, the first end of which is connected to the second terminal of the inductor, and the second terminal of which is connected to a common ground; and a resistor, the first end of which is connected to the sampling terminal of the DC-DC control module and the second terminal of the inductor, and the second terminal of which is connected to a common ground.

[0017] Optionally, the first terminal of the first energy storage circuit serves as the first output terminal of the non-isolated switching power supply, and the first terminal of the second energy storage circuit serves as the second output terminal of the non-isolated switching power supply.

[0018] To achieve the above-mentioned objectives, this application provides a chip that integrates the AC-DC control module described above.

[0019] Optionally, the chip includes a first base island and a second base island, wherein the first base island is configured to encapsulate the current shaping module and the second base island is configured to encapsulate the DC-DC control module.

[0020] Optionally, the chip further includes a third base island configured to encapsulate a withstand voltage module, which is electrically connected to the current shaping module to improve the withstand voltage / load capacity of the current shaping module.

[0021] In order to achieve the above-mentioned objectives, this application provides an electronic device that uses the chip described above, or is powered by the non-isolated switching power supply described above.

[0022] The AC-DC control module provided by this invention achieves stable input and output without the need for a filter at the front end of the AC-DC control module. Furthermore, it eliminates the need for a π-type filter or other external circuits used to adjust power factor, EMI, and other circuit performance parameters at the front end of the AC-DC control module, thus reducing circuit cost and simplifying design. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the circuit structure of the AC-DC control module and the non-isolated switching power supply provided in the embodiments of the present invention.

[0024] Figure 2This is a schematic diagram of the circuit structure of the current shaping module provided in an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the circuit structure of the current shaping module provided in an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the circuit structure of the AC-DC control module and the non-isolated switching power supply provided in the embodiments of the present invention.

[0027] Figure 5 This is a schematic diagram of the circuit structure of the AC-DC control module and the non-isolated switching power supply provided in the embodiments of the present invention.

[0028] Figure 6 This is a schematic diagram of the current waveform output by the current shaping module provided in an embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram of the current waveform output by the current shaping module provided in an embodiment of the present invention.

[0030] Figure 8 This is a schematic diagram of the current waveform output by the current shaping module provided in an embodiment of the present invention.

[0031] Figure 9 This is a schematic diagram of the current waveform output by the current shaping module provided in an embodiment of the present invention.

[0032] Figure 10 This is a schematic diagram of the chip packaging structure provided in an embodiment of the present invention.

[0033] Figure 11 This is a schematic diagram of the chip packaging structure provided in an embodiment of the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0035] like Figure 1As shown, this embodiment provides an AC-DC control module 100, including: a current shaping module 120, whose input terminal is configured to connect to the rectified input of AC power or to connect to the power supply circuit 20, and whose output terminal is connected to the input terminal of a DC-DC control module 110; and a DC-DC control module 110, whose output terminal serves as the second output terminal of the AC-DC control module 110; wherein, the controlled terminal of the current shaping module 120 is connected to a common ground, and is capable of sampling an electrical signal characterizing the input voltage of the DC-DC control module 110, and controlling the current output by the current shaping module 120 to the DC-DC control module 110 based on the electrical signal.

[0036] The alternating current mentioned in this embodiment can be rectified alternating current obtained by rectifying the mains power by a rectifier circuit, and the rectified alternating current can be modulated and output by the current shaping module 120.

[0037] The current shaping module 120 plays three main roles in the AC-DC control module 100:

[0038] First, the current shaping module 120 can rely on its own high-voltage devices to withstand high-voltage input and adjust the output current to convert the input high voltage into low voltage. This low voltage can be used directly as an output for the load, or as a stable input for the DC-DC control module 110.

[0039] Second, the current shaping module 120 can extract a current of a specific waveform from the high voltage input terminal to power the DC-DC control module 110. Its modulation logic is to balance the power factor, EMI, and circuit heating to adapt to specific application scenarios / requirements.

[0040] Third, the current shaping module 120 can sample the electrical signal that characterizes the input voltage of the DC-DC control module 110, and adjust its output current accordingly to the fluctuation of the mains power based on the comparison relationship between the signal and the preset signal / voltage, so that the AC-DC control module 110 can generate a stable output.

[0041] Based on the first and third functions, it can be understood that the input of the DC-DC control module 110 is a current signal processed by the current shaping module 120. Therefore, it is less affected by mains power fluctuations. Consequently, there is no need to set a filter at the front end of the AC-DC control module to achieve stable input and output.

[0042] Based on the second function, it can be understood that since the current shaping module 120 can modulate the waveform of the output current according to specific application scenarios / requirements, there is no need to set up a π-type filter or other peripheral circuits for adjusting power factor, EMI and other circuit performance parameters at the front end of the AC-DC control module, thus realizing cost reduction and design simplification of the circuit.

[0043] In this embodiment, the specific connection position between the controlled terminal of the current shaping module 120 and the AC power is not limited, as long as an electrical signal representing the input voltage of the DC-DC control module 110 can be sampled.

[0044] The following describes several preferred implementations of the current shaping module 120:

[0045] like Figure 2 As shown, the current shaping module 120 includes: a withstand voltage circuit 121, including a first MOSFET M1; and a current shaping circuit 122, including a shaping circuit 1221, an operational amplifier AMP, a second MOSFET M2, and a first resistor R1; the drain of the first MOSFET M1 is configured to be connected to the input terminal of the power supply circuit 20, the gate of the first MOSFET M1 is configured to be connected to a reference voltage VA, the source of the first MOSFET M1 is connected to the drain of the second MOSFET M2, the output terminal of the shaping circuit 1221 is connected to the non-inverting input terminal of the operational amplifier AMP, the inverting input terminal of the operational amplifier AMP is connected to the source of the second MOSFET M2, the first end of the first resistor R1 is connected, the output terminal of the operational amplifier AMP is connected to the gate of the second MOSFET M2, and the second end of the first resistor R1 is configured to be connected to the input terminal of the DC-DC control module 110.

[0046] Among them, the first MOSFET M1 is a high-voltage MOSFET.

[0047] Alternatively, the withstand voltage circuit 121 can also be configured as other high withstand voltage power devices such as BJTs and MOSFETs.

[0048] The output change of the shaping circuit 1221 can cause a corresponding change in the gate voltage of the second MOSFET M2, which in turn affects the source current of the second MOSFET M1, thereby realizing the modulation of the current waveform by the current shaping module 120. The cooperation of the shaping circuit 1221, the operational amplifier AMP and the second MOSFET M2 together realizes the control of the current magnitude by the current shaping module 120. The setting of the first resistor R1 makes the current waveform modulation of the shaping circuit 1221 more accurate. The setting of the withstand voltage circuit 121 improves the withstand voltage / load capacity of the current shaping module 120.

[0049] like Figure 3As shown, the current shaping module 120 includes a shaping circuit 123, a gate drive circuit 124, and a MOSFET M. The output terminal of the shaping circuit 123 is connected to the input terminal of the gate drive circuit 124, and the output terminal of the gate drive circuit 124 is connected to the gate of the MOSFET M. The drain of the MOSFET M is configured to be connected to the power supply circuit 20, and the source of the MOSFET M is configured to be connected to the input terminal of the DC-DC control module 110. The MOSFET M is a high-voltage MOSFET.

[0050] like Figure 4 As shown, the current shaping module 120 can also be directly implemented by the controlled current source I.

[0051] Optionally, such as Figure 6 As shown, "controlling the current output of the current shaping module 120 to the DC-DC control module" includes: modulating the current waveform output to the DC-DC control module 110 so that the current is larger near the trough in each pulse cycle of the rectified AC power provided by the power supply circuit 20. This setting can avoid the problem of circuit overheating caused by high current and voltage near the peak of the rectified AC power due to drawing power from the peak.

[0052] Optionally, such as Figure 7 As shown, "controlling the current output of the current shaping module 120 to the DC-DC control module 110" includes: modulating the current waveform output to the DC-DC control module 110 so that the current magnitude is similar in each pulse cycle of the rectified AC power provided by the power supply circuit 20, and varies accordingly with the changes in the rectified AC power within the cycle. The current shaping module 120 draws power relatively evenly with a smaller current throughout the entire cycle of the rectified AC power. This configuration enables the circuit to have a higher power factor.

[0053] Optionally, such as Figure 8 As shown, in order to achieve a balance between a high power factor and avoiding circuit overheating, one can... Figure 7 Building upon this, "controlling the current output of the current shaping module 120 to the DC-DC control module 110" further includes: modulating the waveform of the current output to the DC-DC control module 110 so that, within a voltage range near the peak of the rectified AC current, the current decreases as the voltage increases. In other words, the current shaping module 120 draws power uniformly with a smaller current throughout the entire cycle of the rectified AC current, and draws power with a relatively smaller current near the peak of the rectified AC current. Specifically, this relatively smaller current can be achieved by introducing an arcsine function, thereby further improving the power supply capability.

[0054] Optionally, such as Figure 9To achieve higher circuit efficiency, the "control current shaping module 120 outputting current to DC-DC control module 110" further includes: modulating the current waveform output to DC-DC control module 110 such that, within a voltage range near the peak of the rectified AC current, the current decreases as the voltage increases; outside this voltage range, the current changes accordingly with voltage variations. Figure 8 Compared to the scheme shown, since the limitation that "the current magnitude is similar in each pulsation cycle of the rectified AC power" is removed, the rate at which the current decreases as the voltage increases can be faster and the magnitude can be greater within the voltage range. Even when the voltage is at its peak, the current can be adjusted to near 0, thus achieving a further improvement in circuit efficiency.

[0055] The voltage range mentioned in this embodiment can be set according to requirements or scenarios.

[0056] Optionally, this embodiment also provides a non-isolated switching power supply 10, such as... Figure 5 As shown, it includes an AC-DC control module 100; a first energy storage circuit C1 connected in parallel across the two ends of the DC-DC control module 110; and a step-down circuit 200 connected to the output of the DC-DC control module 110, which can work with the DC-DC control module 110 to reduce the voltage input to the DC-DC control module 110 and output it.

[0057] Optionally, continue to refer to Figure 5 The step-down circuit 200 includes: an inductor L, the first end of which is connected to the output terminal of the DC-DC control module 110; a second energy storage circuit C2, the first end of which is connected to the second end of the inductor L, and the second end of which is connected to a common ground; and a resistor R, the first end of which is connected to the sampling terminal of the DC-DC control module 110 and the second end of the inductor L, and the second end of which is connected to a common ground.

[0058] Optionally, the non-isolated switching power supply 10 provided in this embodiment is configured with two voltage output terminals: the first terminal of the first energy storage circuit C1 serves as the first output terminal of the non-isolated switching power supply 10, and the first terminal of the second energy storage circuit C2 serves as the second output terminal of the non-isolated switching power supply 10.

[0059] The working principle of the non-isolated switching power supply 10 provided in this embodiment is explained below:

[0060] The input terminal of the AC-DC control module 100 receives the rectified input, and the output current is adjusted based on the VDD voltage by the controlled current source I. After modulation based on the preset waveform, the current I1 is output. This current I1 can charge the first energy storage circuit C1. The first terminal of the first energy storage circuit C1 serves as the first output terminal of the non-isolated switching power supply 10. When the first energy storage circuit C1 is a capacitor, its output voltage VDD is determined by the internal reference of the controlled current source. The output voltage VDD can be configured to 24V, 30V or other voltage values ​​required by low-power appliances based on the application scenario.

[0061] The output voltage VDD also serves as the input terminal of the DC-DC control module 110 to power the DC-DC control module. When the output voltage VDD is lower than the preset voltage, the controlled current source I can increase its output current I1 so that the output voltage VDD rises to the preset voltage.

[0062] The DC-DC control module 110 can work with the step-down circuit 200 to reduce the voltage VDD to a lower voltage required by the application scenario for low-power electrical appliances, such as 3.3V, 5V, 12V, etc.

[0063] refer to Figure 5 The output terminal of the DC-DC control module 110 is connected to the inductor L. The switching unit (not shown) inside the DC-DC control module 110 works in conjunction with the step-down circuit 200 to regulate the output voltage of the second output terminal. Specifically:

[0064] Inductor L: As an energy storage element, inductor L stores energy when the switching unit is turned on; when the switching unit is turned off, the energy in inductor L is released to provide energy for the load.

[0065] Resistor R: Used to ensure that even when the output is unloaded, a low amount of energy is still consumed by resistor R, thus preventing output overshoot.

[0066] The second energy storage circuit C2 can not only store energy, but also filter out ripple in the output voltage and provide a relatively stable output voltage. Specifically, it can be implemented by a capacitor.

[0067] Coordination with switching unit

[0068] When the switching unit is turned on, the input voltage charges the inductor L through the switching unit, and the current in the inductor L gradually increases. This current also supplies power to the output.

[0069] When the switching unit is turned off, the current in the inductor L cannot change abruptly and will continue to flow through the freewheeling diode and the load. At this time, the energy of the inductor L is released, continuously providing energy to the load.

[0070] Duty cycle adjustment: By adjusting the proportion of the switching unit's on-time to the entire switching cycle (i.e., the duty cycle), the average charge of inductor L can be controlled, thereby controlling the output voltage. More specifically, when V0 is lower than the preset voltage V, the output voltage can be increased by increasing the duty cycle; when V0 is higher than the preset voltage V, the output voltage can be decreased by decreasing the duty cycle. This setting provides a stable output voltage that meets expectations. The above adjustment method is just one common approach in switching power supplies, and this invention is not limited to its internal control principles and details.

[0071] Optionally, this embodiment provides a chip that integrates the AC-DC control module 100 provided in this embodiment.

[0072] Optionally, such as Figure 10 As shown, the chip provided in this embodiment includes a first base island 01 and a second base island 02. The first base island 01 is configured to encapsulate a current shaping module 120, and the second base island 02 is configured to encapsulate a DC-DC control module 110. Optionally, as... Figure 11 As shown, the chip it illustrates is similar to... Figure 10 The difference in the chip shown is that it also includes a third base island 03, which is configured to encapsulate a withstand voltage module 300, which is electrically connected to a current shaping module 120 to improve the withstand voltage / load capacity of the current shaping module 120. The withstand voltage module 300 can be implemented by a controlled current source.

[0073] Optionally, in some embodiments, the current shaping module 120 and the DC-DC control module 110 may also be located on the same base island.

[0074] Optionally, this embodiment provides an electronic device that uses the chip described above, or is powered by the non-isolated switching power supply 10 described above.

[0075] This electronic device can power components in small household appliances that require a working voltage lower than that of the mains power, such as table lamps and small fans. It can also be other low-voltage electronic / power devices that are powered by AC but operate in a DC environment. It should be noted that the low voltage mentioned here is not a limitation on a specific voltage or voltage range, but refers to a working voltage lower than the input voltage.

[0076] The technical solution of the present invention has now been described in conjunction with the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to the specific embodiments described above. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions resulting from such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An AC-DC control module, characterized in that, include: The current shaping module has its input configured to connect to a power supply circuit, and its output connected to the input of a DC-DC control module. as well as The output terminal of the DC-DC control module serves as the output terminal of the AC-DC control module. The controlled terminal of the current shaping module is connected to the power supply circuit, and can sample the electrical signal that characterizes the input voltage of the DC-DC control module, and control the magnitude and waveform of the current output by the current shaping module to the DC-DC control module based on the electrical signal.

2. The AC-DC control module according to claim 1, characterized in that, The current shaping module includes: The withstand voltage circuit includes a first MOSFET M1; and The current shaping circuit includes a shaping circuit, an operational amplifier, a second MOSFET M2, and a first resistor R1. The drain of the first MOSFET M1 is configured to be connected to the power supply circuit, the gate of the first MOSFET M1 is configured to be connected to a reference voltage, the source of the first MOSFET M1 is connected to the drain of the second MOSFET M2, the output of the shaping circuit is connected to the non-inverting input of the operational amplifier, the inverting input of the operational amplifier is connected to the source of the second MOSFET M2 and the first end of the first resistor R1, the output of the operational amplifier is connected to the gate of the second MOSFET M2, and the second end of the first resistor R1 is configured to be connected to the input of the DC-DC control module.

3. The AC-DC control module according to claim 1, characterized in that, The current shaping module includes a MOSFET M, a shaping circuit, and a gate drive circuit. The output terminal of the shaping circuit is connected to the input terminal of the gate drive circuit, and the output terminal of the gate drive circuit is connected to the gate of the MOSFET M. The drain of the MOSFET M is configured to be connected to the power supply circuit, and the source of the MOSFET M is configured to be connected to the input terminal of the DC-DC control module.

4. The AC-DC control module according to claim 1, characterized in that, The current shaping module is a controlled current source.

5. The AC-DC control module according to any one of claims 1-4, characterized in that, The phrase "controlling the current output from the current shaping module to the DC-DC control module" includes: modulating the current waveform output to the DC-DC control module such that, within each pulse cycle of the rectified AC power provided by the power supply circuit, the current near the trough is larger.

6. The AC-DC control module according to any one of claims 1-4, characterized in that, The phrase "controlling the current output from the current shaping module to the DC-DC control module" includes: modulating the current waveform output to the DC-DC control module so that the current magnitude is similar in each pulse cycle of the rectified AC power provided by the power supply circuit, and changes accordingly with the change of the rectified AC power within the cycle.

7. The AC-DC control module according to claim 6, characterized in that, The phrase "controlling the current output from the current shaping module to the DC-DC control module" further includes: modulating the waveform of the current output to the DC-DC control module so that, within a voltage range near the peak of the rectified AC current, the current decreases as the voltage increases.

8. The AC-DC control module according to any one of claims 1-4, characterized in that, The phrase "controlling the current output from the current shaping module to the DC-DC control module" includes: modulating the waveform of the current output to the DC-DC control module such that, within a voltage range near the peak of the rectified AC current, the current decreases as the voltage increases, and outside this voltage range, the current changes accordingly with the voltage.

9. The AC-DC control module according to any one of claims 1-4, characterized in that, It also includes a withstand voltage module, which is electrically connected to the current shaping module to improve the withstand voltage / load capacity of the current shaping module.

10. A non-isolated switching power supply, characterized in that, include: The AC-DC control module according to any one of claims 1-9; The first energy storage circuit is connected in parallel across the two ends of the DC-DC control module; as well as The step-down circuit is connected to the output terminal of the DC-DC control module and can work with the DC-DC control module to reduce the voltage input to the DC-DC control module before outputting it.

11. The non-isolated switching power supply according to claim 10, characterized in that, The step-down circuit includes: The inductor's first end is connected to the control / output terminal of the DC-DC control module; The second energy storage circuit has a first terminal connected to the second terminal of the inductor, and the second terminal connected to a common ground; and The resistor has its first end connected to the sampling terminal of the DC-DC control module and the second end of the inductor, with the second end connected to a common ground.

12. The non-isolated switching power supply according to claim 10 or 11, characterized in that, The first terminal of the first energy storage circuit serves as the first output terminal of the non-isolated switching power supply, and the first terminal of the second energy storage circuit serves as the second output terminal of the non-isolated switching power supply.

13. A chip, characterized in that, It integrates the AC-DC control module according to any one of claims 1-9.

14. An electronic device, characterized in that, The chip described in claim 13 is used, or the non-isolated switching power supply described in any one of claims 10-12 is used for power supply.

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