Electric energy conversion circuit and electronic equipment

Abstract

The invention provides an electric energy conversion circuit and electronic equipment. The electric energy conversion circuit comprises a power supply unit, a sampling unit and a protection unit, the power supply unit is used for being connected with a power supply device and a power utilization device and used for receiving power supply voltage of the power supply device and outputting load voltage to the power utilization device. The input end and the output end of the sampling unit are connected with the power supply unit, and the sampling unit is used for collecting load voltage and outputting feedback voltage to the power supply unit according to the load voltage; the first end of the protection unit is connected with the output end of the sampling unit, the second end of the protection unit is connected with the power end of the power supply unit, the third end of the protection unit is connected with the first grounding end, and the protection unit controls the power end of the power supply unit and the first grounding end to be in a closed state when the feedback voltage is smaller than a preset voltage threshold value.

Description

Technical Field

[0001] The present application relates to the technical field of power supply protection, and in particular to an electric energy conversion circuit and an electronic device. Background Art

[0002] At present, power conversion circuits are widely used in various electronic devices to convert the power provided by the power supply device into power that meets the requirements of the power consumption device. In practical applications, the power conversion circuit needs to have certain protection functions to deal with faults such as short circuits in the power consumption device. When a short circuit occurs in the power consumption device, the protection unit in the power conversion circuit should respond in time and shut down the power conversion circuit to prevent further damage to the power supply device and the power consumption device. However, the existing protection unit has some limitations in design, especially when facing a wide range of input voltage values, it is difficult to provide stable and reliable protection functions.

[0003] Traditional protection units are usually designed for a specific input voltage range and are difficult to adapt to a wide range from low voltage to high voltage. This limitation requires different protection units to be used in different application scenarios, which increases the complexity of design and manufacturing, and there are reliability issues in actual operation. In addition, with the diversified development of electronic devices, power conversion circuits need to operate stably under a wider range of input voltages, which places higher requirements on the adaptability of protection units. Summary of the invention

[0004] The present application provides an electric energy conversion circuit and an electronic device, which can operate in a wide input voltage range to improve the reliability and stability of the electric energy conversion process.

[0005] In a first aspect, an embodiment of the present application provides an electric energy conversion circuit, the electric energy conversion circuit comprising: a power supply unit, a sampling unit and a protection unit; The power supply unit is used to connect the power supply device and the power consumption device respectively, and the power supply unit is used to receive the power supply voltage of the power supply device and output the load voltage to the power consumption device; The input end and the output end of the sampling unit are both connected to the power supply unit, and the sampling unit is used to collect the load voltage and output a feedback voltage to the power supply unit according to the load voltage; The first end of the protection unit is connected to the output end of the sampling unit, the second end of the protection unit is connected to the power supply end of the power supply unit, and the third end of the protection unit is connected to the first ground end. When the feedback voltage is less than a preset voltage threshold, the protection unit controls the power supply end of the power supply unit and the first ground end to be in a connection state.

[0006] In a second aspect, an embodiment of the present application provides an electronic device, wherein the electronic device comprises a power conversion circuit as described in any one of the embodiments of the present application.

[0007] The embodiment of the present application provides an electric energy conversion circuit, which includes: a power supply unit, a sampling unit and a protection unit. The power supply unit is used to connect a power supply device and an electric device respectively, and the power supply unit is used to receive the power supply voltage of the power supply device and output the load voltage to the electric device; the input end and the output end of the sampling unit are both connected to the power supply unit, and the sampling unit is used to collect the load voltage and output the feedback voltage to the power supply unit according to the load voltage; the first end of the protection unit is connected to the output end of the sampling unit, the second end of the protection unit is connected to the power supply end of the power supply unit, and the third end of the protection unit is connected to the first ground end. When the feedback voltage is less than a preset voltage threshold, the protection unit controls the power supply end of the power supply unit and the first ground end to be in a connection state. In the above-mentioned electric energy conversion circuit, when the sampling unit monitors that the load voltage drops sharply, the output feedback voltage will cause the protection unit to enter a working state, that is, the protection unit provides a power-on circuit to the power supply end and the first ground end of the power supply unit, pulls down the voltage of the power supply end of the power supply unit, causes the power supply unit to enter a non-working state due to undervoltage, interrupts the power supply to the electric device, and can work in a wide input voltage range to improve the reliability and stability of the electric energy conversion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0009] Figure 1 A schematic block diagram of an electric energy conversion circuit provided in an embodiment of the present application; Figure 2 A circuit diagram of a first electric energy conversion circuit provided in an embodiment of the present application; Figure 3 A circuit diagram of a second electric energy conversion circuit provided in an embodiment of the present application.

[0010] Description of reference numerals: 300, power supply device; 200, power consumption device; 100, power conversion circuit; 11, power supply unit; 111, input rectifier unit; 112, current limiting unit; 113, transformer unit; 114, power management unit; 115, control unit; 116, output rectifier unit; 117, auxiliary power supply unit; 118, peak absorption unit; 119, input filter unit; 12, sampling unit; 13, protection unit; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; D1, first voltage regulator diode; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth Capacitor; C5, the fifth capacitor; R6, the sixth resistor; R7, the seventh resistor; R8, the eighth resistor; R9, the ninth resistor; R10, the tenth resistor; R11, the eleventh resistor; R12, the twelfth resistor; R13, the thirteenth resistor; R14, the fourteenth resistor; G1, the optocoupler; D2, the second voltage-stabilizing diode; U1, the power management chip; Q1, the first switch tube; Q2, the second switch tube; Q3, the third switch tube; Q4, the fourth switch tube; Q5, the fifth switch tube; Q6, the sixth switch tube; Q7, the seventh switch tube; Q8, the eighth switch tube; Q9, the ninth switch tube; L1, the input winding; L2, the output winding; L3, the step-down winding. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0013] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0014] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0015] See also Figure 1 , Figure 1 is a schematic block diagram of an electric energy conversion circuit provided by an embodiment of the present application. Figure 1 As shown, an embodiment of the present application provides a power conversion circuit 100 , including: a power supply unit 11 , a sampling unit 12 and a protection unit 13 .

[0016] The power supply unit 11 is used to connect the power supply device 300 and the power consumption device 200 respectively. The power supply unit 11 is used to receive the power supply voltage of the power supply device 300 and output a load voltage to the power consumption device 200 .

[0017] Exemplarily, the power supply device 300 is a device or system capable of providing electrical energy, including: a power grid, a battery, a generator, and a solar panel. The power consumption device 200 is a device or system that uses electrical energy to work, including: lighting equipment, motors, household appliances, computers, and communication equipment. The power conversion circuit 100 is used to convert the supply voltage of the power supply device 300 into the load voltage required by the power consumption device. This can include boost, buck, or buck-boost conversion to meet the needs of different power consumption devices 200.

[0018] The input end and the output end of the sampling unit 12 are both connected to the power supply unit 11 . The sampling unit 12 is used to collect the load voltage and output a feedback voltage to the power supply unit 11 according to the load voltage.

[0019] Exemplarily, the input end of the sampling unit 12 is connected to the output end of the power supply unit 11, and is used to collect the load voltage output by the power supply unit 11, and output a corresponding feedback voltage according to the load voltage. The output object is the power supply unit 11, so as to assist the power supply unit 11 in output regulation of the load voltage to ensure the safety of the power conversion process.

[0020] The first end of the protection unit 13 is connected to the output end of the sampling unit 12, the second end of the protection unit 13 is connected to the power end of the power supply unit 11, and the third end of the protection unit 13 is connected to the first ground end. When the feedback voltage is less than a preset voltage threshold, the protection unit 13 controls the power end of the power supply unit 11 and the first ground end to be in a connection state.

[0021] Exemplarily, when the feedback voltage is less than a preset voltage threshold, the protection unit 13 provides a power-on circuit to the power supply terminal and the first ground terminal of the power supply unit 11, and the power-on circuit includes a switch component and an electric energy consumption component, for example, the switch component is a switch tube, and the electric energy consumption component is a resistor. When the power supply terminal and the first ground terminal of the power supply unit 11 are in a conductive state, the protection unit 13 discharges the electric energy terminal of the power supply unit 11 through the electric energy consumption component, pulls down the voltage of the electric energy terminal of the power supply unit 11, and puts the power supply unit 11 in an undervoltage state, so as to stop providing the load voltage to the electrical device 200.

[0022] The embodiment of the present application provides an electric energy conversion circuit, which includes: a power supply unit, a sampling unit and a protection unit. The power supply unit is used to connect a power supply device and an electric device respectively, and the power supply unit is used to receive the power supply voltage of the power supply device and output the load voltage to the electric device; the input end and the output end of the sampling unit are both connected to the power supply unit, and the sampling unit is used to collect the load voltage and output the feedback voltage to the power supply unit according to the load voltage; the first end of the protection unit is connected to the output end of the sampling unit, the second end of the protection unit is connected to the power supply end of the power supply unit, and the third end of the protection unit is connected to the first ground end. When the feedback voltage is less than a preset voltage threshold, the protection unit controls the power supply end of the power supply unit and the first ground end to be in a connection state. In the above-mentioned electric energy conversion circuit, when the sampling unit monitors that the load voltage drops sharply, the output feedback voltage will cause the protection unit to enter a working state, that is, the protection unit provides a power-on circuit to the power supply end and the first ground end of the power supply unit, pulls down the voltage of the power supply end of the power supply unit, causes the power supply unit to enter a non-working state due to undervoltage, interrupts the power supply to the electric device, and can work in a wide input voltage range to improve the reliability and stability of the electric energy conversion process.

[0023] In order to more clearly introduce the technical solution of the present application, the technical solution of the present application will be introduced through specific embodiments below. It should be noted that the specific embodiments are used to expand the technical solution of the present application, but are not intended to limit the present application.

[0024] See also Figure 2 , Figure 2 is a circuit diagram of the first electric energy conversion circuit provided by the embodiment of the present application. Figure 2 As shown, the protection unit 13 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first voltage stabilizing diode D1, a first switch tube Q1 and a first capacitor C1.

[0025] The first end of the first resistor R1 is connected to the output end of the sampling unit 12, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the first ground end, the first end of the second resistor R2 is also connected to the reference electrode of the first voltage zener diode D1, the second end of the second resistor R2 is also connected to the anode of the first voltage zener diode D1, the cathode of the first voltage zener diode D1 is connected to the first end of the third resistor R3, the second end of the third resistor R3 is respectively connected to the first end of the fourth resistor R4 and the controlled end of the first switch tube Q1, the first end of the first switch tube Q1 is respectively connected to the power supply end of the power supply unit 11, the second end of the fourth resistor R4, and the first end of the first capacitor C1, the second end of the first switch tube Q1 is connected to the first end of the fifth resistor R5. The second end of the first capacitor C1 is connected to the first ground end. The second end of the fifth resistor R5 is connected to the first ground end.

[0026] Exemplarily, when the electric device 200 is short-circuited, the load voltage at the output end of the power supply unit 11 increases rapidly, and the feedback voltage output by the sampling unit 12 also increases accordingly, and is transmitted to the reference electrode (Vref) of the first voltage zener diode D1, pulling up the voltage of the reference electrode of the first voltage zener diode D1, making the anode and cathode of the first voltage zener diode D1 conductive, and dividing the voltage at the controlled end (base) of the first switch tube Q1, so that the voltage of the controlled end of the first switch tube Q1 is less than the voltage of the first end (collector) of the first switch tube Q1, so that the first end and the second end (drain) of the first switch tube Q1 are conductive. The voltage at the power supply end (VCC) of the power supply unit 11 flows to the first ground end through the power-on loop formed by the first end of the first switch tube Q1, the second end of the first switch tube Q1 and the fifth resistor R5, thereby pulling down the voltage at the power supply end of the power supply unit 11, causing the power supply unit 11 to enter the undervoltage protection state, and stop controlling the power supply device 300 to supply power to the electric device 200.

[0027] It should be noted that the power supply end of the power supply unit 11 is powered after the power supply voltage of the power supply device 300 is stepped down, and the power supply voltage of the power supply device 300 still has voltage fluctuations after the voltage is stepped down. In the prior art, a voltage stabilizer is added to the power supply end of the power supply unit 11 to reduce the voltage fluctuation of the power supply end of the power supply unit 11 to protect the power supply unit 11. When the power supply voltage range of the power supply device 300 is very wide, for example, 110V-230V, the voltage at the power supply end of the power supply unit 11 may be very large, and the regulation range of the voltage stabilizer is smaller than the voltage variation range of the power supply end, which may easily cause damage to the voltage stabilizer and the power supply unit 11. In the embodiment of the present application, the first switch tube Q1 and the fifth resistor R5 can both withstand a large current. Even if the voltage at the power supply end is very large, the voltage at the power supply end can be easily reduced to the voltage required for the power supply unit 11 to enter the undervoltage protection state, thereby achieving the purpose of output short circuit protection. The first switch tube Q1 is saturated by the fourth resistor R4, so the conduction loss is very small, it is not easy to be damaged, and the reliability is very high.

[0028] In some embodiments, see Figure 3 , Figure 3 The circuit diagram of the second power conversion circuit provided by the embodiment of the present application is shown. Figure 3 As shown, the sampling unit 12 includes: a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a photoelectric coupling element G1 and a second voltage stabilizing diode D2.

[0029] The first end of the sixth resistor R6 is the input end of the sampling unit 12, the first end of the sixth resistor R6 is connected to the first end of the seventh resistor R7, and the second end of the sixth resistor R6 is connected to the first end of the photoelectric coupler G1. The second end of the seventh resistor R7 is respectively connected to the reference electrode of the second voltage zener diode D2 and the first end of the eighth resistor R8. The second end of the eighth resistor R8 is respectively connected to the anode of the second voltage zener diode D2 and the second grounding terminal. The cathode of the second voltage zener diode D2 is connected to the second end of the photoelectric coupler G1. The third end of the photoelectric coupler G1 is connected to the first grounding terminal, the fourth end of the photoelectric coupler G1 is the output end of the sampling unit 12, and the fourth end of the photoelectric coupler G1 is connected to the first end of the protection unit 13.

[0030] Exemplarily, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are used for voltage sampling, and the voltage at the second end of the seventh resistor R7 is the voltage of the reference electrode (Vref) input to the second voltage zener diode D2. In the process of increasing the load voltage, the voltage at the second end of the seventh resistor R7 increases, and the voltage at the reference electrode of the second voltage zener diode D2 also increases accordingly, so that the second voltage zener diode D2 is turned on, so that the voltage at the fourth end of the photoelectric coupling device G1 (the output end of the sampling unit 12) increases. When the voltage at the fourth end of the photoelectric coupling device G1 (the output end of the sampling unit 12) increases to a preset voltage threshold, the protection unit 13 is caused to enter a working state, thereby reducing the voltage at the power supply end of the power supply unit 11.

[0031] In some embodiments, Figure 3 As shown, the power supply unit 11 includes: an input rectifying unit 111 , a current limiting unit 112 , a voltage transforming unit 113 , a power management unit 114 , a control unit 115 and an output rectifying unit 116 .

[0032] The input end of the input rectifier unit 111 is connected to the power supply device 300, and the output end of the input rectifier unit 111 is connected to the first end of the transformer unit 113 and the first end of the current limiting unit 112. The second end of the current limiting unit 112 is connected to the power supply end of the control unit 115, and the power supply end of the power supply unit 11 is the power supply end of the control unit 115. The second end of the transformer unit 113 is connected to the first end of the power management unit 114. The controlled end of the power management unit 114 is connected to the output end of the control unit 115. The third end and the fourth end of the transformer unit 113 are the output ends of the transformer unit 113, and the output end of the transformer unit 113 is connected to the first end of the output rectifier unit 116, and the second end of the output rectifier unit 116 is connected to the power consumption device 200.

[0033] Exemplarily, the input rectifier unit 111 is a full-bridge rectifier circuit, which is used to convert the power supply voltage provided by the power supply device 300 into a DC voltage. The first output end of the input unit is connected to the first end of the transformer unit 113 and the first end of the current limiting unit 112, and the first output end of the input unit is connected to the first ground end. The current limiting unit 112 is used to limit the DC voltage and then supply power to the power supply end of the control unit 115 to avoid the DC voltage shock causing the control unit 115 to burn. The second end of the transformer unit 113 is connected to the first end of the power management unit 114. The controlled end of the power management unit 114 is connected to the output end of the control unit 115. The control unit 115 controls the conversion power of the transformer unit 113 by outputting a PWM signal to the power management unit 114 to control the power output of the transformer unit 113. The output rectifier unit 116 rectifies the AC voltage output by the transformer unit 113 into a DC voltage, and then supplies power to the power-consuming device 200.

[0034] In some embodiments, the input rectifier circuit includes: a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4 and a fifth switch tube Q5.

[0035] In some embodiments, the current limiting unit 112 includes: a ninth resistor R9 and a tenth resistor R10. The first end of the ninth resistor R9 is the first end of the current limiting unit 112, the second end of the ninth resistor R9 is connected to the first end of the tenth resistor R10, and the second end of the tenth resistor R10 is connected to the power supply end of the control unit 115.

[0036] In some embodiments, Figure 3 As shown, the control unit 115 includes a power management chip U1. The VCC pin of the power management chip U1 is the power supply terminal of the control unit 115, the OUT pin of the power management chip U1 is the output terminal of the control unit 115, and the COMP pin of the power management chip U1 is the input terminal of the feedback voltage.

[0037] The power management chip U1 is powered by the output voltage of the input rectifier unit 111. Specifically, the output voltage of the input rectifier unit 111 is stepped down by the ninth resistor R9 and the tenth resistor R10, and then the power management chip U1 is powered. In order to ensure the safety of the power management chip U1, the conventional practice is to install a voltage stabilizer between the tenth resistor R10 and the power management chip U1. However, the regulation range of the voltage stabilizer is smaller than the voltage variation range of the power supply end, which can easily cause damage to the voltage stabilizer and the power management chip U1. Therefore, in the present application, the voltage of the power supply end (VCC) of the power management chip U1 is directly lowered through the power-on circuit of the first switch tube Q1 and the fifth resistor R5, so that the power management chip U1 enters the undervoltage protection state, thereby realizing the protection of the power management chip U1.

[0038] In some embodiments, Figure 3 As shown, the power management unit 114 includes: a sixth switch tube Q6, an eleventh resistor R11 and a twelfth resistor R12. The first end of the eleventh resistor R11 is connected to the output end (OUT) of the control unit 115, the second end of the eleventh resistor R11 is connected to the controlled end of the sixth switch tube Q6, and the eleventh resistor R11 is used for current limiting. The first end of the input winding L1 of the transformer unit 113 is connected to the first output end of the input rectifier circuit, the second end of the input winding L1 of the transformer unit 113 is connected to the first end of the sixth switch tube Q6, the second end of the sixth switch tube Q6 is connected to the first end of the twelfth resistor R12, and the second end of the twelfth resistor R12 is connected to the first ground end.

[0039] In some embodiments, Figure 3As shown, the output rectifier circuit includes: a seventh switch tube Q7, a second capacitor C2, and a thirteenth resistor R13. The first end of the output winding L2 of the transformer unit 113 is connected to the input end of the seventh switch tube Q7, and the output end of the seventh switch tube Q7 is respectively connected to the first end of the second capacitor C2, the first end of the thirteenth resistor R13, and the first end of the seventh resistor R7, and the second end of the output winding L2 of the transformer unit 113 is respectively connected to the second end of the second capacitor C2, the second end of the thirteenth resistor R13, and the second grounding end. The first end and the second end of the thirteenth resistor R13 are the output ends of the output rectifier unit 116, which are used to connect to the electrical device 200.

[0040] In some embodiments, Figure 3 As shown, the power supply unit 11 includes an auxiliary power supply unit 117. A first end of the auxiliary power supply unit 117 is connected to the first ground end, a second end of the auxiliary power supply unit 117 is connected to the power supply end of the control unit 115, and the auxiliary power supply unit 117 is used to provide a driving voltage to the control unit 115.

[0041] The auxiliary power supply unit 117 includes: a step-down winding, an eighth switch tube Q8 and a third capacitor C3. The step-down winding obtains electric energy through the input winding L1 of the transformer unit 113, the first end of the step-down winding is connected to the input end of the eighth switch tube Q8, the output end of the eighth switch tube Q8 is respectively connected to the first end of the third capacitor C3 and the power supply end of the control unit 115, and the second end of the step-down winding and the second end of the third capacitor C3 are both connected to the first ground end.

[0042] In some embodiments, Figure 3 As shown, the power supply unit 11 further includes: a peak absorption unit 118 . A first end of the peak absorption unit 118 is connected to a first end of the voltage transformation unit 113 , and a second end of the peak absorption unit 118 is connected to a second end of the voltage transformation unit 113 .

[0043] like Figure 3 As shown, the peak absorption unit 118 includes: a ninth switch tube Q9, a fourth capacitor C4 and a fourteenth resistor R14. The output end of the ninth switch tube Q9 is connected to the first end of the input winding L1 of the transformer unit 113, the input end of the ninth switch tube Q9 is respectively connected to the first end of the fourth capacitor C4 and the first end of the fourteenth resistor R14, and the second end of the fourth capacitor C4 and the second end of the fourteenth resistor R14 are both connected to the second end of the input winding L1 of the transformer unit 113. The peak absorption unit 118 is used to eliminate abnormal peak voltages and prevent peak voltages from impacting various components of the power conversion circuit 100.

[0044] In some embodiments, Figure 3 As shown, the power supply unit 11 includes: an input filter unit 119 .

[0045] The first end and the second end of the input filter unit 119 are both connected to the output end of the input rectifier circuit, and the second end of the input filter unit 119 is connected to the first ground end. The input filter unit 119 includes a fifth capacitor C5, the first end of the fifth capacitor C5 is the first end of the input filter unit 119, and the second end of the fifth capacitor C5 is the second end of the input filter unit 119.

[0046] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An electric energy conversion circuit, characterized in that: The electric energy conversion circuit comprises: A power supply unit, the power supply unit is used to connect the power supply device and the power consumption device respectively, the power supply unit is used to receive the power supply voltage of the power supply device and output a load voltage to the power consumption device; A sampling unit, wherein the input end and the output end of the sampling unit are both connected to the power supply unit, and the sampling unit is used to collect the load voltage and output a feedback voltage to the power supply unit according to the load voltage; A protection unit, wherein a first end of the protection unit is connected to the output end of the sampling unit, a second end of the protection unit is connected to the power supply end of the power supply unit, and a third end of the protection unit is connected to the first ground end. When the feedback voltage is less than a preset voltage threshold, the protection unit controls the power supply end of the power supply unit and the first ground end to be in a connection state.

2. The electric energy conversion circuit according to claim 1, characterized in that: The protection unit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first voltage stabilizing diode, a first switch tube and a first capacitor; The first end of the first resistor is connected to the output end of the sampling unit, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the first ground end, the first end of the second resistor is also connected to the reference electrode of the first voltage regulator diode, the second end of the second resistor is also connected to the anode of the first voltage regulator diode, the cathode of the first voltage regulator diode is connected to the first end of the third resistor, the second end of the third resistor is respectively connected to the first end of the fourth resistor and the controlled end of the first switch tube, the first end of the first switch tube is respectively connected to the power supply end of the power supply unit, the second end of the fourth resistor, and the first end of the first capacitor, the second end of the first switch tube is connected to the first end of the fifth resistor; the second end of the first capacitor is connected to the first ground end; the second end of the fifth resistor is connected to the first ground end.

3. The electric energy conversion circuit according to claim 1, characterized in that: The sampling unit includes: a sixth resistor, a seventh resistor, an eighth resistor, a photoelectric coupling element and a second voltage stabilizing diode; The first end of the sixth resistor is the input end of the sampling unit, the first end of the sixth resistor is connected to the first end of the seventh resistor, and the second end of the sixth resistor is connected to the first end of the photoelectric coupler; the second end of the seventh resistor is respectively connected to the reference electrode of the second voltage zener diode and the first end of the eighth resistor; the second end of the eighth resistor is respectively connected to the anode of the second voltage zener diode and the second grounding end; the cathode of the second voltage zener diode is connected to the second end of the photoelectric coupler; the third end of the photoelectric coupler is connected to the first grounding end, the fourth end of the photoelectric coupler is the output end of the sampling unit, and the fourth end of the photoelectric coupler is connected to the first end of the protection unit.

4. The electric energy conversion circuit according to claim 1, characterized in that: The power supply unit includes: an input rectifying unit, a current limiting unit, a voltage transforming unit, a power management unit, a control unit and an output rectifying unit; The input end of the input rectifier unit is connected to the power supply device, and the output end of the input rectifier unit is connected to the first end of the transformer unit and the first end of the current limiting unit; the second end of the current limiting unit is connected to the power supply end of the control unit, and the power supply end of the power supply unit is the power supply end of the control unit; the second end of the transformer unit is connected to the first end of the power management unit; the controlled end of the power management unit is connected to the output end of the control unit; the third and fourth ends of the transformer unit are the output ends of the transformer unit, and the output end of the transformer unit is connected to the first end of the output rectifier unit, and the second end of the output rectifier unit is connected to the electrical device.

5. The electric energy conversion circuit according to claim 4, characterized in that: The power supply unit comprises: an auxiliary power supply unit; A first end of the auxiliary power supply unit is connected to the first ground end, a second end of the auxiliary power supply unit is connected to a power supply end of the control unit, and the auxiliary power supply unit is used to provide a driving voltage to the control unit.

6. The electric energy conversion circuit according to claim 4, characterized in that: The power supply unit further includes: a peak absorption unit; The first end of the peak absorption unit is connected to the first end of the voltage transformation unit, and the second end of the peak absorption unit is connected to the second end of the voltage transformation unit.

7. The electric energy conversion circuit according to claim 4, characterized in that: The power supply unit comprises: an input filter unit; The first end and the second end of the input filter unit are both connected to the output end of the input rectifier circuit, and the second end of the input filter unit is connected to the first ground end.

8. The electric energy conversion circuit according to claim 4, characterized in that: The control unit includes a power management chip; The VCC pin of the power management chip is the power supply terminal of the control unit, the OUT pin of the power management chip is the output terminal of the control unit, and the COMP pin of the power management chip is the input terminal of the feedback voltage.

9. The electric energy conversion circuit according to claim 4, characterized in that: The current limiting unit includes: a ninth resistor and a tenth resistor; The first end of the ninth resistor is the first end of the current limiting unit, the second end of the ninth resistor is connected to the first end of the tenth resistor, and the second end of the tenth resistor is connected to the power supply end of the control unit.

10. An electronic device, characterized in that: The electronic device comprises the electric energy conversion circuit as claimed in any one of claims 1 to 9.

Images