Power supply adjustment circuit, power adapter, and method for controlling power adapter

Abstract

To provide a power supply adjustment circuit, a power adapter, and a control method of the power adapter.SOLUTION: A power supply adjustment circuit for a power adapter, comprising: a temperature detection circuit, configured to obtain a temperature detection voltage according to an internal temperature of the power adapter; an output state detection circuit, coupled to a power conversion circuit of the power adapter, and configured to obtain an output state detection voltage; A control circuit configured to generate an adjustment signal according to the output state detection voltage when the temperature detection voltage exceeds a preset voltage range, so as to adjust an output signal or an output power of the power adapter.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to power conversion and power supply technology, and more particularly to a power supply regulation circuit, a power adapter, and a control method for a power adapter. [Background technology]

[0002] A power adapter is a power conversion device that converts the voltage of a power source (e.g., commercial power or storage equipment) to match the operating voltage of various electronic products, thereby powering or charging the electronic products. Both power supply stability and product durability are important design considerations for power adapters. Summary of the Invention [Means for solving the problem]

[0003] The present disclosure relates to a power supply regulating circuit for use in a power adapter, including: a temperature detection circuit for obtaining a temperature detection voltage based on an internal temperature of the power adapter; an output state detection circuit coupled to a power conversion circuit of the power adapter for obtaining an output state detection voltage; and a control circuit coupled to the power conversion circuit, the temperature detection circuit, and the output state detection circuit for determining whether the temperature detection voltage exceeds a preset voltage range, and for generating an adjustment signal based on the output state detection voltage so as to adjust an output signal or output power of the power adapter when the temperature detection voltage exceeds the preset voltage range.

[0004] The present disclosure further relates to a control method for a power adapter, comprising the steps of: acquiring, by a temperature detection circuit, a temperature detection voltage based on an internal temperature of the power adapter; acquiring, by an output state detection circuit, an output state detection voltage from a power conversion circuit of the power adapter; determining, by a control circuit, whether the temperature detection voltage exceeds a preset voltage range; generating an adjustment signal based on the output state detection voltage when the temperature detection voltage exceeds the preset voltage range; and adjusting an output signal or an output power of the power adapter based on the adjustment signal.

[0005] The present disclosure further relates to a power adapter including: a power conversion circuit; a control circuit coupled to the power conversion circuit, for controlling an output signal output from the power conversion circuit to a load; a temperature detection circuit coupled to the control circuit and a temperature detection element of the power adapter, for obtaining a temperature detection voltage based on an internal temperature of the power adapter; and an output status detection circuit coupled to the power conversion circuit and the control circuit, for providing an output status detection voltage to the control circuit, wherein the control circuit is used to determine whether the temperature detection voltage exceeds a preset voltage range; and when the temperature detection voltage exceeds the preset voltage range, the control circuit is used to generate an adjustment signal based on the output status detection voltage, and adjust the output signal based on the adjustment signal. [Effects of the Invention]

[0006] This allows the internal temperature and current status of the power conversion circuit within the power adapter to be simultaneously detected, and the output signal or output power of the power adapter can be dynamically adjusted in real time to ensure normal operation of the power adapter. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram of a power adapter and power supply conditioning circuit according to some embodiments of the present disclosure. [Figure 2] FIG. 2 is a process flow diagram of a method for controlling a power adapter according to some embodiments of the present disclosure. [Figure 3A] FIG. 2 is a schematic diagram of a power supply conditioning circuit according to some embodiments of the present disclosure. [Figure 3B] FIG. 2 is a schematic diagram of a power supply conditioning circuit according to some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0008] In the following, several embodiments of the present invention are disclosed in the drawings, and for clarity, many practical details are set forth in the following description. However, it should be understood that these practical details are not intended to limit the present invention. That is, in some embodiments of the present invention, these practical details are not necessarily required. In addition, in order to simplify the drawings, some conventional structures and elements are shown in simplified and schematic form in the drawings.

[0009] As used herein, when elements are said to be "connected" or "coupled," this may refer to an "electrical connection" or "electrical coupling." "Connected" or "coupled" may be used to indicate a combined operation or interaction between two or more elements. Also, although terms such as "first" and "second" are used herein to describe different elements, these terms are merely used to distinguish between elements or operations described with the same technical term. Unless the context clearly dictates, these terms do not imply or suggest a particular order or sequence, and are not intended to limit the invention.

[0010] FIG. 1 shows a schematic diagram of a power adapter 100 and a power supply regulation circuit 200 according to some embodiments of the present disclosure. The power adapter 100 receives an input voltage Vin, converts the voltage value of the input voltage Vin, and generates an output voltage Vout. The output voltage Vout is provided to a load (not shown) for driving or charging the load. The power adapter 100 can obtain the input voltage Vin from a power source (e.g., a utility power source or a power storage device), and the load can be any electronic device that needs to be driven or charged.

[0011] The power supply regulation circuit 200 may be disposed within and be a part of the power adapter 100. The power supply regulation circuit 200 is used to selectively regulate the operating state (e.g., output power) of the power adapter 100 so as to change the output signal of the power adapter 100. Because voltage and current are related electrical characteristics of a power signal, the aforementioned "output signal" may be a voltage value (e.g., output voltage Vout) or a current value output by the power adapter 100.

[0012] In one embodiment, the power adapter 100 can convert an input voltage Vin to an output voltage Vout using an isolated power conversion circuit. For example, as shown in FIG. 1 , the power adapter 100 includes a power conversion circuit 110, a voltage regulation circuit 120, and a filter circuit 130. The power conversion circuit 110 includes a primary side circuit 111 and a secondary side circuit 112. The voltage regulation circuit 120 (e.g., a level shifter) is coupled to the power conversion circuit 110 (or as part of the power conversion circuit 110) and is used to regulate the voltage domain and output the voltage. The filter circuit 130 is coupled to the voltage regulation circuit 120 and is used to filter voltage noise output by the voltage regulation circuit 120 and generate the output voltage Vout. The circuit structure shown in FIG. 1 is merely exemplary, and the power adapter 100 is not limited thereto. Those skilled in the art will understand how to implement power conversion and voltage conversion, and a detailed description will not be provided here.

[0013] Power adapter 100 further includes a temperature sensing element TS disposed within power adapter 100 and coupled to power supply regulation circuit 200. Temperature sensing element TS has electrical characteristics (e.g., impedance value) that change with ambient temperature and is used to sense the internal temperature of power adapter 100. Here, the electrical characteristics of temperature sensing element TS that change with temperature are referred to as the "temperature sensing signal." Depending on the placement of temperature sensing element TS, the magnitude of the temperature sensing signal may be positively or negatively correlated with the internal temperature of power adapter 100.

[0014] Because the power adapter 100 converts electrical power, it generates heat during operation and must therefore have a heat dissipation mechanism, such as heat sinks. If the temperature inside the power adapter 100 becomes too high, the internal circuitry may be affected in operating efficiency and even damaged. However, given the volume and cost requirements of the power adapter 100, the heat dissipation mechanism inside the power adapter 100 becomes a significant design challenge. In the present disclosure, the power supply regulation circuit 200 adjusts the operating state (e.g., output power) of the power adapter 100 in real time, thereby reducing the requirements for the power adapter 100's heat dissipation mechanism.

[0015] As shown in FIG. 1 , the power supply regulation circuit 200 includes a temperature detection circuit 210, an output state detection circuit 220, and a control circuit 230. The temperature detection circuit 210 is coupled to a temperature detection element TS so as to obtain a temperature detection voltage according to the internal temperature of the power adapter 100. In one embodiment, the temperature detection element TS generates a temperature detection signal (e.g., an impedance value) based on the temperature, and the temperature detection circuit 210 converts the temperature detection signal into a corresponding temperature detection voltage. For example, the temperature detection circuit 210 is coupled to the temperature detection element TS and a reference impedance element. Since the impedance value of the reference impedance element does not change with temperature, the temperature detection circuit 210 can detect the cross-voltage or divided voltage value of the temperature detection element TS and / or the reference impedance element as the temperature detection voltage. Those skilled in the art will understand the installation form of the temperature detection element, and therefore, a repeated description will not be provided here.

[0016] The output state detection circuit 220 is coupled to the power conversion circuit 110 and is used to obtain an output state detection voltage. In one embodiment, the output state detection circuit 220 is coupled to the secondary side circuit 112 to obtain a current value flowing through the secondary side circuit 112 and generate / calculate an output state detection voltage based on the current value. That is, the output state detection voltage corresponds to the current value of the secondary side circuit 112.

[0017] The control circuit 230 is coupled to the power conversion circuit 110, the temperature detection circuit 210, and the output state detection circuit 220 to obtain the temperature detection voltage and the output state detection voltage. The control circuit 230 can also control the output signal (output voltage Vout shown in FIG. 1) from the power conversion circuit 110 to the load. During operation of the power adapter 100, the control circuit 230 determines whether the temperature detection voltage exceeds a preset voltage range (e.g., 10 volts to 20 volts). The "preset voltage range" represents the normal temperature range of the power adapter 100; exceeding this range indicates that the temperature of the power adapter 100 is too high and poses a risk of damaging internal components.

[0018] If the temperature detection voltage exceeds the preset voltage range, the control circuit 230 generates an adjustment signal based on the output state detection voltage. The adjustment signal is used to adjust the output signal (e.g., the output voltage Vout or the magnitude of the output current) of the power adapter 100, or to adjust the output power of the power adapter 100 (e.g., reduce the operating frequency of the power conversion circuit 110). The adjustment form will be described in detail in a later paragraph.

[0019] In the present disclosure, the power supply regulation circuit 200 detects the temperature and power conversion / rectification status of the power adapter 100 and dynamically adjusts the operating mode of the power adapter 100 in real time (e.g., changes the output power or output voltage). This allows the power adapter 100 to automatically adjust when the temperature is too high, thereby reducing the use of heat dissipation elements and improving the overall volume and manufacturing costs of the power adapter 100.

[0020] 2 illustrates a control method for a power adapter according to some embodiments of the present disclosure, which is applicable to the power adapter 100 and the power supply regulation circuit 200 shown in FIG. In step S201, the power adapter 100 operates to convert an input voltage Vin into an output voltage Vout. In this case, the temperature detection circuit 210 obtains a temperature detection voltage from the temperature detection element TS. As described in the previous embodiments, the temperature detection circuit 210 can detect the impedance or voltage division of the temperature detection element TS to generate and transmit the temperature detection voltage to the control circuit 230.

[0021] At the same time, the output state detection circuit 220 obtains an output state detection voltage from the power conversion circuit 110 and provides it to the control circuit 230. As described in the above embodiment, the output state detection voltage can be generated based on the current value of the secondary side circuit of the power conversion circuit 110.

[0022] In step S202, the control circuit 230 determines whether the temperature detection voltage exceeds a preset voltage range. For example, the preset voltage range is 10 volts to 20 volts. If the temperature detection voltage and the internal temperature of the power adapter 100 have a positive correlation, a temperature detection voltage greater than 20 volts indicates that the internal temperature of the power adapter 100 is too high. On the other hand, if the temperature detection voltage and the internal temperature of the power adapter 100 have a negative correlation, a temperature detection voltage less than 10 volts indicates that the internal temperature of the power adapter 100 is too high.

[0023] It should be noted that, in one embodiment, the output status detection circuit 220 periodically obtains the output status detection voltage, but the present disclosure is not limited thereto. In another embodiment, the output status detection circuit 220 may provide the output status detection voltage to the control circuit 230 only when the control circuit 230 determines that the temperature detection voltage has exceeded a preset voltage range.

[0024] If the temperature detection voltage does not exceed the preset voltage range, the control circuit 230 will not change the power adapter 100. On the other hand, if it is determined that the temperature detection voltage exceeds the preset voltage range, in step S203, the control circuit 230 generates an adjustment signal based on the output status detection voltage, and changes the output signal or output power of the power adapter 100 according to the adjustment signal.

[0025] Specifically, the control circuit 230 determines the difference value at which the temperature detection voltage exceeds the preset voltage range, and then generates an adjustment signal based on the difference value and the output status detection voltage. If the temperature detection voltage is 25 volts, this voltage value exceeds the preset voltage range (10 volts to 20 volts), and the difference value between the temperature detection voltage and the upper limit of the preset voltage range is 5 volts. This difference value indicates the degree to which the temperature exceeds the normal range, and the output status detection voltage indicates the current operating state of the power conversion circuit 110. Therefore, the control circuit 230 can perform an operation on the output status detection voltage based on this difference value to generate an adjustment signal. For example, a difference value of 5 volts indicates that the output power needs to be reduced by 5%, and the control circuit 230 can determine the adjustment signal (e.g., the frequency of the switching control within the power conversion circuit 110) required when the power conversion circuit 110 reduces its current output power by 5% based on the output status detection voltage.

[0026] In one embodiment, the control circuit 230 may further include multiple preset adjustment parameters, each corresponding to a different difference value, for controlling circuits or elements of the power adapter 100, such as frequency, output power, current, or voltage. After determining the difference value between the temperature detection voltage and the preset voltage range, the control circuit 230 finds a specific adjustment parameter corresponding to the difference value and then performs calculations based on the adjustment parameter and the output state detection voltage to generate an adjustment signal. For example, if a difference value of "5 volts" corresponds to an adjustment parameter of "1.5 mA current," indicating that the current output by the power adapter 100 should be adjusted to 1.5 mA, the control circuit 230 may generate a corresponding adjustment signal based on the current output state detection voltage to reduce the current output by the power adapter 100 to 1.5 mA.

[0027] 3A shows a schematic diagram of a power adapter 310A and a power supply regulation circuit 320A according to some embodiments of the present disclosure. In FIG. 3A, similar elements to those in the embodiment of FIG. 1 are designated by the same names for ease of understanding, and the specific principles of the similar elements have been described in detail in the previous paragraph and will not be described again here unless necessary due to their cooperative relationship with the elements in FIG. 3A.

[0028] Referring to Figure 3A, the power adapter 310A includes a power conversion circuit 311A, a control switch 312A, and an output circuit 313A. The secondary voltage / current generated by the power conversion circuit 311A ​​is provided to the output circuit 313A by the control switch 312A, and then output to a load via the output circuit 313A. Since those skilled in the art can understand the operating principles of the power adapter, Figure 3A only shows a portion of the circuit of the power adapter 310A, and its operation will not be described separately herein.

[0029] The power supply adjustment circuit 320A includes a temperature detection circuit 321A, an output state detection circuit 322A, and a control circuit 323A. The temperature detection circuit 321A is coupled to the temperature detection element R31 and is used to obtain a temperature detection voltage (e.g., obtain a cross-voltage value based on impedance). In some embodiments, the temperature detection circuit 321A is further coupled to the reference impedance element R32. Because the impedance of the reference impedance element R32 does not change with temperature, the temperature detection circuit 321A can calculate the temperature detection voltage by comparing the cross-voltage difference or impedance difference between the temperature detection element R31 and the reference impedance element R32.

[0030] The output state detection circuit 322A includes a plurality of voltage-dividing resistors R33, R34 and a filter capacitor C31. The voltage-dividing resistors R33, R34 are coupled to the changeover switch T31 ​​of the secondary side circuit of the power conversion circuit 311A ​​to obtain a synchronous rectification voltage related to the secondary side current. The output state detection circuit 322A divides the synchronous rectification voltage using the voltage-dividing resistors R33, R34, and then filters noise using the filter capacitor C31, after which it can obtain the output state detection voltage.

[0031] The control circuit 323A is coupled to the temperature detection circuit 321A and the output state detection circuit 322A, and is used to determine whether the temperature detection voltage exceeds a preset voltage range, and to generate an adjustment signal based on the output state detection voltage. The operation of the control circuit 323A may be the same as that of the embodiment shown in FIG.

[0032] In some embodiments, the control circuit 323A transmits the adjustment signal through a voltage / current modulation circuit 324A. The voltage / current modulation circuit 324A is coupled between the control circuit 323A and the power conversion circuit 311A ​​(secondary side circuit 311AS) and includes a plurality of capacitors CA / CB, a plurality of resistors RA / RB, and a photocoupler OC. The voltage / current modulation circuit 324A uses the capacitors CA and CB to change the voltage division between the resistors RA and RB based on the adjustment signal, and transmits the secondary side voltage or current generated by the secondary side circuit 311AS to the primary side circuit 311AP of the power conversion circuit 311A ​​via the photocoupler OC, thereby adjusting the switching frequency and duty cycle of the primary side circuit 311AP and changing the output voltage of the power conversion circuit 311A.

[0033] The manner in which the control circuit 323A adjusts the output signal or output power of the power adapter 310A using the adjustment signal is not limited to the manner shown in FIG. 3A . In some embodiments, the control circuit 323A may change the switching frequency of the control switch 312A using the adjustment signal. In other embodiments, the control circuit 323A may input the adjustment signal as a confirmation signal to the load of the power adapter 310A to adjust the current value between the power adapter 310A and the load.

[0034] For example, if the load is a laptop computer, its preset power supply requirement is 60 watts and 5 amps. However, the laptop computer may not always maintain a high power of 60 watts and may only require 30 watts of power under normal operating conditions. Therefore, if the power supply regulation circuit 320A determines that the temperature of the power adapter 310A is too high, the control circuit 323A provides an adjustment signal to the laptop computer as a confirmation signal, allowing the power supply to be reduced to 30 watts according to the protocol. This allows the output current of the power adapter 310A to be reduced to 2.5 amps.

[0035] In some embodiments, the temperature detection circuit 321A, the control circuit 323A, and the voltage / current modulation circuit 324A may be separate circuits or integrated into the same single-chip microcomputer (SC).

[0036] 3B shows a schematic diagram of a power adapter 310B and a power supply regulation circuit 320B according to some embodiments of the present disclosure. In FIG. 3B, similar elements associated with the embodiments of FIG. 1 and FIG. 3A are designated by the same names for ease of understanding. The specific principles of the similar elements have been described in detail in the previous paragraph and have a cooperative relationship with the elements of FIG. 3B, and will not be described again here unless necessary.

[0037] Referring to Figure 3B, the power adapter 310B includes a power conversion circuit 311B, a control switch 312B, and an output circuit 313B. The secondary voltage / current generated by the power conversion circuit 311B is provided to the output circuit 313B by the control switch 312B, and then output to a load via the output circuit 313B. Since those skilled in the art can understand the operating principles of the power adapter, Figure 3B only shows a portion of the circuit of the power adapter 310B, and its operation will not be described separately herein.

[0038] The power supply adjustment circuit 320B includes a temperature detection circuit 321B, an output state detection circuit 322B, and a control circuit 323B. The temperature detection circuit 321B is coupled to a temperature detection element R35 and is used to obtain a temperature detection voltage (e.g., obtain a cross-voltage value based on impedance). As in the previous embodiment, the temperature detection circuit 321B is further coupled to a reference impedance element R36. Since the impedance of the reference impedance element R36 does not change with temperature, the temperature detection circuit 321B can calculate the temperature detection voltage by comparing the cross-voltage difference or impedance difference between the temperature detection element R35 and the reference impedance element R36.

[0039] The output state detection circuit 322B includes a plurality of voltage-dividing resistors R37 and R38 and a filter capacitor C32. The voltage-dividing resistors R37 and R38 are coupled to the changeover switch T32 of the secondary side circuit of the power conversion circuit 311B so as to obtain a synchronous rectification voltage related to the secondary side current. The output state detection circuit 322B divides the synchronous rectification voltage using the voltage-dividing resistors R37 and R38, and then filters noise using the filter capacitor C32, after which it can obtain the output state detection voltage.

[0040] The control circuit 323B is coupled to the temperature detection circuit 321B and the output state detection circuit 322B, and is used to determine whether the temperature detection voltage exceeds a preset voltage range, and to generate an adjustment signal based on the output state detection voltage. The operation of the control circuit 323B may be the same as that of the embodiment shown in Figures 1 and 3A.

[0041] In some embodiments, the control circuit 323B transmits the adjustment signal through a voltage / current modulation circuit 324B. The voltage / current modulation circuit 324B is coupled between the control circuit 323B and the power conversion circuit 311B (secondary side circuit 311BS) and includes a transistor switching T33. The voltage / current modulation circuit 324B controls the on / off of the transistor switching T33 based on the adjustment signal to transmit the secondary side voltage or current generated by the secondary side circuit 311BS to the primary side circuit 311BP, and further adjusts the switching frequency and duty cycle of the primary side circuit 311BP and changes the output voltage of the power conversion circuit 311B.

[0042] Similar to the previous embodiments, the manner in which the control circuit 323B adjusts the output signal or output power of the power adapter 310B using the adjustment signal is not limited to the manner shown in Fig. 3B. The adjustment signal may be provided to the control switch 312B or the load to change the output power or output signal of the power adapter 310B.

[0043] The elements, method steps or technical features in the above-described embodiments can be combined with each other without being limited to the order of the letters or the order of the drawings in this disclosure.

[0044] The present disclosure is disclosed in the embodiments as described above, but the above-described embodiments are not used to limit the present disclosure, and anyone skilled in the art can make various modifications and improvements without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure should be determined based on what is defined by the claims attached below. [Explanation of symbols]

[0045] 100: Power adapter 110: Power conversion circuit 111: Primary circuit 112: Secondary circuit 120: Voltage regulation circuit 130: Filter circuit 200: Power supply adjustment circuit 210: Temperature detection circuit 220: Output state detection circuit 230: Control circuit 310A: Power adapter 311A: Power conversion circuit 311AP: Primary side circuit 311AS: Secondary circuit 312A: Control switch 313A: Output circuit 320A: Power supply adjustment circuit 321A: Temperature detection circuit 322A: Output status detection circuit 323A: Control circuit 324A: Voltage-current modulation circuit 310B: Power adapter 311B: Power conversion circuit 311BP: Primary side circuit 311BS: Secondary circuit 312B: Control switch 313B: Output circuit 320B: Power supply adjustment circuit 321B: Temperature detection circuit 322B: Output state detection circuit 323B: Control circuit 324B: Voltage-current modulation circuit C31: Filter capacitor C32: Filter capacitor CA: Capacitor CB: Capacitor OC: Photocoupler R31: Temperature detection element R32: Reference impedance element R33: Voltage dividing resistor R34: Voltage dividing resistor R35: Temperature detection element R36: Reference impedance element R37: Voltage dividing resistor R38: Voltage dividing resistor RA: Resistance RB: Resistance SC: Single-chip microcomputer T31: Changeover switch T32: Changeover switch T33: Transistor switching TS: Temperature detection element Vin: Input voltage Vout: Output voltage

Claims

1. In a power supply regulation circuit used in a power adapter, a temperature detection circuit for obtaining a temperature detection voltage based on an internal temperature of the power adapter; an output state detection circuit coupled to a power conversion circuit of the power adapter for obtaining an output state detection voltage; a control circuit coupled to the power conversion circuit, the temperature detection circuit, and the output state detection circuit, for determining whether the temperature detection voltage exceeds a preset voltage range, and for generating an adjustment signal based on the output state detection voltage so as to adjust an output signal or an output power of the power adapter when the temperature detection voltage exceeds the preset voltage range; a power supply regulation circuit including:

2. 2. The power supply regulation circuit of claim 1, wherein the control circuit is adapted to determine a difference value by which the temperature detection voltage exceeds the preset voltage range, and generate the regulation signal based on the difference value and the output state detection voltage.

3. 3. The power supply adjustment circuit according to claim 2, wherein the control circuit is used to find one of a plurality of adjustment parameters corresponding to the difference value, and to perform calculations based on the one of the plurality of adjustment parameters and the output state detection voltage to generate the adjustment signal.

4. 2. The power supply adjustment circuit according to claim 1, wherein the control circuit is used to transmit a voltage or a current of a secondary side circuit of the power conversion circuit to a primary side circuit of the power conversion circuit based on the adjustment signal, thereby changing an output voltage of the power conversion circuit.

5. 2. The power supply regulating circuit of claim 1, wherein the control circuit transmits the regulating signal to a load connected to the power adapter to regulate a current value between the power adapter and the load.

6. 2. The power supply regulation circuit according to claim 1, wherein the output state detection voltage is generated based on a current value in a secondary side circuit of the power conversion circuit.

7. 2. The power supply regulation circuit of claim 1, wherein the temperature detection circuit is coupled to a temperature detection element in the power adapter to obtain a temperature detection signal, and is used to convert the temperature detection signal into the temperature detection voltage.

8. 8. The power supply regulation circuit according to claim 1, wherein the output state detection circuit includes a plurality of voltage dividing resistors and a filter capacitor.

9. obtaining a temperature detection voltage based on an internal temperature of the power adapter by a temperature detection circuit; obtaining an output state detection voltage from a power conversion circuit of the power adapter by an output state detection circuit; determining, by a control circuit, whether the temperature detection voltage exceeds a preset voltage range; generating an adjustment signal based on the output status detection voltage when the temperature detection voltage exceeds the preset voltage range; adjusting the output signal or output power of the power adapter based on the adjustment signal; A method for controlling a power adapter comprising:

10. The method for generating the adjustment signal based on the output state detection voltage may include: determining a difference value by which the temperature detection voltage exceeds the preset voltage range; generating the adjustment signal based on the difference value and the output state detection voltage; The method for controlling a power adapter according to claim 9, comprising:

11. The method of generating the adjustment signal based on the difference value and the output state detection voltage may include: Finding one of a plurality of adjustment parameters that corresponds to the difference value; performing a calculation based on the one of the plurality of adjustment parameters and the output state detection voltage to generate the adjustment signal; The method for controlling a power adapter according to claim 10, comprising:

12. The method for adjusting the output signal or the output power of the power adapter based on the adjustment signal may include:

10. The control method for a power adapter according to claim 9, further comprising: transmitting a voltage or a current of a secondary circuit of the power conversion circuit to a primary circuit of the power conversion circuit based on the adjustment signal, thereby changing an output voltage of the power conversion circuit.

13. The method for adjusting the output signal or the output power of the power adapter based on the adjustment signal may include:

10. The method of claim 9, further comprising transmitting the adjusting signal to a load connected to the power adapter to adjust a current value between the power adapter and the load.

14. The method for obtaining the output state detection voltage from the power conversion circuit of the power adapter may include:

14. The control method for a power adapter according to claim 9, further comprising generating the output state detection voltage based on a current value of a secondary side circuit of the power conversion circuit.

15. a power conversion circuit; a control circuit coupled to the power conversion circuit for controlling an output signal from the power conversion circuit to a load; a temperature detection circuit coupled to the control circuit and the temperature detection element of the power adapter, for obtaining a temperature detection voltage based on an internal temperature of the power adapter; an output state detection circuit coupled to the power conversion circuit and the control circuit, the output state detection circuit providing an output state detection voltage to the control circuit; Including, the control circuit is used to determine whether the temperature detection voltage exceeds a preset voltage range; When the temperature detection voltage exceeds the preset voltage range, the control circuit generates an adjustment signal based on the output state detection voltage, and adjusts the output signal based on the adjustment signal.

16. 16. The power adapter of claim 15, wherein the control circuit is adapted to determine a difference value by which the temperature detection voltage exceeds the preset voltage range, and generate the adjustment signal based on the difference value and the output status detection voltage.

17. 17. The power adaptor of claim 16, wherein the control circuit is configured to find one of a plurality of adjustment parameters corresponding to the difference value, and to perform an operation based on the one of the plurality of adjustment parameters and the output state detection voltage to generate the adjustment signal.

18. 16. The power adapter of claim 15, wherein the control circuit is used to transmit a voltage or a current of a secondary circuit of the power conversion circuit to a primary circuit of the power conversion circuit based on the adjustment signal, thereby changing an output voltage of the power conversion circuit.

19. 16. The power adaptor according to claim 15, wherein the output state detection voltage is generated based on a current value of a secondary circuit of the power conversion circuit.

20. 20. The power adaptor of claim 15, wherein the output state detection circuit includes a plurality of voltage dividing resistors and a filter capacitor.

Images