Power supply circuit and electric equipment

Abstract

The utility model provides a power supply circuit and electric equipment. The power supply circuit comprises a first voltage stabilizing unit, an indicating unit and an energy storage filtering unit, the cathode of the first voltage stabilizing unit is electrically connected with the cathode of the indicating unit, the anode of the indicating unit is electrically connected with the power supply anode input end and the first end of the energy storage filtering unit, and the second end of the energy storage filtering unit and the anode of the first voltage stabilizing unit are electrically connected with the power supply cathode input end. Or, the positive electrode of the indicating unit is electrically connected with the positive electrode of the first voltage stabilizing unit, the negative electrode of the first voltage stabilizing unit is electrically connected with the power supply positive electrode input end and the first end of the energy storage filtering unit, and the second end of the energy storage filtering unit and the negative electrode of the indicating unit are electrically connected with the power supply negative electrode input end; the first voltage stabilizing unit is used for reverse conduction when the terminal voltage is larger than the working reference voltage. Discharging of the energy storage filtering unit can only maintain the indicating unit to continue working for a short period of time, and the indicating deviation of the indicating function is reduced.

Description

Technical Field

[0001] This application relates to the technical field of power supplies, and more particularly to a power supply circuit and an electrical device. Background Art

[0002] Electrical devices generally have corresponding power indicators to enable users to intuitively judge the states such as whether the electrical device is powered on or turned on. In response to this situation, an indicating unit is usually used for indication. When the power supply is working and normally outputting voltage, the indicating unit is activated; when the power supply is turned off and the voltage output is suspended, the indicating unit is turned off.

[0003] However, a corresponding energy storage and filtering unit is usually provided in the power supply circuit. After the power supply is turned off and the voltage output is suspended, the energy storage and filtering unit will discharge, causing the indicating unit to continue to work and possibly for a long time, resulting in a large indication deviation in the indicating function of the indicating unit. Utility Model Content

[0004] In view of the deficiencies in the prior art, this application provides a power supply circuit and an electrical device.

[0005] In a first aspect, in one embodiment, this application provides a power supply circuit, which includes:

[0006] A first voltage stabilizing unit, an indicating unit, and an energy storage and filtering unit;

[0007] The negative electrode of the first voltage stabilizing unit is electrically connected to the negative electrode of the indicating unit. The positive electrode of the indicating unit is respectively electrically connected to the positive power input terminal and the first end of the energy storage and filtering unit. The second end of the energy storage and filtering unit and the positive electrode of the first voltage stabilizing unit are respectively electrically connected to the negative power input terminal; or, the positive electrode of the indicating unit is electrically connected to the positive electrode of the first voltage stabilizing unit. The negative electrode of the first voltage stabilizing unit is respectively electrically connected to the positive power input terminal and the first end of the energy storage and filtering unit. The second end of the energy storage and filtering unit and the negative electrode of the indicating unit are respectively electrically connected to the negative power input terminal;

[0008] The first voltage stabilizing unit is configured to conduct reversely when its terminal voltage is greater than the working reference voltage.

[0009] In one embodiment, the first voltage stabilizing unit includes a first voltage stabilizing diode or a first TVS tube.

[0010] In one embodiment, the indicating unit includes a first light emitting diode unit.

[0011] In one embodiment, the power supply circuit further includes a rectifying unit;

[0012] The input end of the rectifying unit is electrically connected to the positive power input terminal;

[0013] The output terminal of the rectifying unit is electrically connected to the first end of the energy storage and filtering unit and the anode of the first light-emitting diode unit respectively, or the output terminal of the rectifying unit is electrically connected to the first end of the energy storage and filtering unit and the negative electrode of the first voltage stabilizing unit respectively.

[0014] In one embodiment, the rectifying unit includes a first rectifying diode;

[0015] The anode of the first rectifying diode is electrically connected to the positive power input terminal;

[0016] The cathode of the first rectifying diode is electrically connected to the first end of the energy storage and filtering unit and the anode of the first light-emitting diode unit respectively, or the cathode of the first rectifying diode is electrically connected to the first end of the energy storage and filtering unit and the negative electrode of the first voltage stabilizing unit respectively.

[0017] In one embodiment, the rectifying unit further includes a second rectifying diode;

[0018] The anode of the second rectifying diode is electrically connected to the anode of the first rectifying diode and the positive power input terminal respectively, and the cathode of the second rectifying diode is electrically connected to the cathode of the first rectifying diode and the first end of the energy storage and filtering unit respectively.

[0019] In one embodiment, the rectifying unit further includes an RC absorption circuit;

[0020] The first end of the RC absorption circuit is electrically connected to the anode of the first rectifying diode and the positive power input terminal respectively, and the second end of the RC absorption circuit is electrically connected to the cathode of the first rectifying diode and the first end of the energy storage and filtering unit respectively.

[0021] In one embodiment, the power supply circuit further includes a second voltage stabilizing unit, and the indicating unit further includes a second light-emitting diode unit;

[0022] The positive electrode of the second voltage stabilizing unit is electrically connected to the anode of the second light-emitting diode unit, the cathode of the second light-emitting diode unit is electrically connected to the positive power input terminal and the second end of the energy storage and filtering unit respectively, and the second end of the energy storage and filtering unit and the negative electrode of the second voltage stabilizing unit are electrically connected to the negative power input terminal respectively; or, the cathode of the second light-emitting diode unit is electrically connected to the negative electrode of the second voltage stabilizing unit, the positive electrode of the second voltage stabilizing unit is electrically connected to the positive power input terminal and the second end of the energy storage and filtering unit respectively, and the second end of the energy storage and filtering unit and the anode of the second light-emitting diode unit are electrically connected to the negative power input terminal respectively;

[0023] The second voltage stabilizing unit is used to conduct reversely when its terminal voltage is greater than the working reference voltage.

[0024] In one embodiment, the energy storage and filtering unit includes an input filter capacitor, an input discharge resistor, a filter inductor, an output filter capacitor and an output discharge resistor;

[0025] The first end of the input filtering capacitor is electrically connected to the positive power input terminal, the first end of the input discharging resistor, and the first end of the filtering inductor respectively. The second end of the filtering inductor is electrically connected to the first end of the output filtering capacitor and the first end of the output discharging resistor respectively. The second ends of the input filtering capacitor, the input discharging resistor, the output filtering capacitor, and the output discharging resistor are electrically connected to the negative power input terminal respectively.

[0026] In a second aspect, in an embodiment, the present utility model provides an electrical device including the power supply circuit in any of the above embodiments.

[0027] Through the above power supply circuit and electrical device, a corresponding first voltage stabilizing unit is set and connected in reverse series with the indicating unit. After the power supply is shut down, when the terminal voltage of the first voltage stabilizing unit is lower than the working reference voltage, it will be cut off, thereby turning off the indicating unit, so that the discharge of the energy storage and filtering unit can only maintain the indicating unit to work for a short period of time, reducing the indication deviation of the indicating function. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 Schematic diagram of the structure of a power supply circuit provided by an embodiment of the present application;

[0030] Figure 2 Schematic diagram of the structure of a power supply circuit including a rectifying unit provided by an embodiment of the present application;

[0031] Figure 3 Schematic diagram of the specific circuit implementation of a power supply circuit provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0033] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise as an example. In the present application, the term "exemplary" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "exemplary" in the present application is not necessarily to be construed as more preferred or more advantageous than other embodiments. In order for any person skilled in the art to implement and use the present application, the following description is given. In the following description, details are set forth for purposes of explanation. It should be understood that those of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in the present application.

[0034] In a first aspect, as Figure 1 shown, in one embodiment, the present application provides a power supply circuit, which includes a first voltage stabilizing unit 101, an indicating unit 102, and an energy storage and filtering unit 103.

[0035] The negative electrode of the first voltage stabilizing unit 101 is electrically connected to the negative electrode of the indicating unit 102. The positive electrode of the indicating unit 102 is respectively electrically connected to the power supply positive input terminal IN+ and the first end of the energy storage and filtering unit 103. The second end of the energy storage and filtering unit 103 and the positive electrode of the first voltage stabilizing unit 101 are respectively electrically connected to the power supply negative input terminal OUT+.

[0036] The first voltage stabilizing unit 101 is configured to conduct reversely when its terminal voltage is greater than the working reference voltage.

[0037] Among them, the first voltage stabilizing unit 101 includes, but is not limited to, a TVS tube, and the indicating unit 102 includes, but is not limited to, a buzzer.

[0038] Among them, the discharge voltage of the energy storage and filtering unit 103 decreases as the electrical energy stored in it decreases. When the first voltage stabilizing unit 101 is not provided, when the discharge voltage is lower than the operating voltage of the indicating unit 102, the indicating unit 102 stops working. The operating voltage of the indicating unit 102 is usually small, which enables the indicating unit 102 to continue working based on the discharge of the energy storage and filtering unit 103 for a long time. After the first voltage stabilizing unit 101 is provided, since the first voltage stabilizing unit 101 will conduct in reverse only when the terminal voltage is greater than its reference voltage, when the discharge voltage of the energy storage and filtering unit 103 is lower than the reference voltage of the first voltage stabilizing unit 101, the indicating unit 102 stops working. The reference voltage of the first voltage stabilizing unit 101 is much greater than the operating voltage of the indicating unit 102, which enables the indicating unit 102 to continue working based on the discharge of the energy storage and filtering unit 103 for a short time.

[0039] Among them, it is only necessary that the first voltage stabilizing unit 101 and the indicating unit 102 are in a reverse series relationship, and the specific positions do not need to be limited. Therefore, in other embodiments, the positions of the first voltage stabilizing unit 101 and the indicating unit 102 can also be swapped. As an example, the positive electrode of the indicating unit 102 is electrically connected to the positive electrode of the first voltage stabilizing unit 101. The negative electrode of the first voltage stabilizing unit 101 is respectively electrically connected to the positive power input terminal IN+ and the first end of the energy storage and filtering unit 103. The second end of the energy storage and filtering unit 103 and the negative electrode of the indicating unit 102 are respectively electrically connected to the negative power input terminal OUT+.

[0040] Through the above power supply circuit, by setting the corresponding first voltage stabilizing unit and connecting it in reverse series with the indicating unit, when the power supply is turned off, when the terminal voltage of the first voltage stabilizing unit is lower than the operating reference voltage, it will cut off, thereby turning off the indicating unit, so that the discharge of the energy storage and filtering unit can only maintain the indicating unit to continue working for a short period of time, reducing the deviation of the indicating function.

[0041] As Figure 3 shown, in one embodiment, the first voltage stabilizing unit 101 includes a zener diode ZD202.

[0042] Among them, as mentioned in the above embodiment, the first voltage stabilizing unit 101 can include a TVS tube. Both the zener diode ZD202 and the TVS tube have the function of cutting off when the terminal voltage is lower than their reference voltages, and users can choose according to the actual situation.

[0043] As Figure 3 shown, in one embodiment, the indicating unit 102 includes a first light emitting diode unit. As an example, the first light emitting diode unit includes a light emitting diode LED201 and a current limiting resistor R212.

[0044] Among them, as mentioned in the above embodiments, the indicating unit 102 may include a buzzer. Although the buzzer can play an indicating role, in actual scenarios, it is likely to cause environmental noise. Compared with the buzzer, the light-emitting diode LED201 gives an indication by lighting up or extinguishing, and the overall effect is better.

[0045] Among them, since the internal resistance of the light-emitting diode LED201 is small, the current-limiting resistor R212 is used to limit the current flowing through the light-emitting diode LED201 to prevent it from being burned out due to excessive current.

[0046] As Figure 2 shown, in one embodiment, when the indicating unit 102 includes a first light-emitting diode unit, the power supply circuit further includes a rectifying unit 104.

[0047] The input end of the rectifying unit 104 is electrically connected to the power supply positive input terminal IN+, and the output end of the rectifying unit 104 is respectively electrically connected to the first end of the energy storage and filtering unit 103 and the positive pole of the indicating unit 102. Or in other embodiments, when the positions of the first voltage stabilizing unit 101 and the indicating unit 102 are exchanged, the output end of the rectifying unit 104 is respectively electrically connected to the first end of the energy storage and filtering unit 103 and the negative pole of the first voltage stabilizing unit 101.

[0048] Among them, the core of the first light-emitting diode unit is a light-emitting diode. When there is a relatively large reverse voltage on the light-emitting diode, such as when the power supply is reversely connected resulting in an output reverse voltage, it is easily broken down. Therefore, in this embodiment, in view of this situation, the rectifying unit 104 is provided. The rectifying unit 104 can rectify the output voltage of the power supply into one direction, so that there is no reverse voltage on the light-emitting diode, realizing the protection of the light-emitting diode and also improving the stability of the power supply circuit in the indicating function.

[0049] As Figure 3 shown, in one embodiment, the rectifying unit 104 includes a first rectifying diode D201.

[0050] The anode of the first rectifying diode D201 is electrically connected to the power supply positive input terminal IN+, and the cathode of the first rectifying diode D201 is respectively electrically connected to the first end of the energy storage and filtering unit 103 and the positive pole of the indicating unit 102. Or in other embodiments, when the positions of the first voltage stabilizing unit 101 and the indicating unit 102 are exchanged, the cathode of the first rectifying diode D201 is respectively electrically connected to the first end of the energy storage and filtering unit 103 and the negative pole of the first voltage stabilizing unit 101.

[0051] Among them, based on its one-way conduction characteristic, the first rectifying diode D201 can achieve half-wave rectification, with a simple structure and can play a role in protecting the light-emitting diode LED201.

[0052] As shown Figure 3 In one embodiment, the rectification unit 104 further includes a second rectifying diode D202.

[0053] The anode of the second rectifying diode D202 is electrically connected to the anode of the first rectifying diode D201 and the positive power input terminal IN+ respectively, and the cathode of the second rectifying diode D202 is electrically connected to the cathode of the first rectifying diode D201 and the first end of the energy storage and filtering unit 103 respectively.

[0054] Among them, by setting the first rectifying diode D201 and the second rectifying diode D202 simultaneously, the power can be improved.

[0055] As shown Figure 3 In one embodiment, the rectification unit 104 further includes an RC absorption circuit. As an example, the RC absorption circuit includes a capacitor C201, a resistor R201, and a resistor R202. The first end of the capacitor C201 is electrically connected to the positive power input terminal IN+. The second end of the capacitor C201 is electrically connected to the first ends of the resistor R201 and the resistor R202 respectively.

[0056] The first end of the RC absorption circuit (such as Figure 3 the first end of the capacitor C201 in Figure 3 ) is electrically connected to the anode of the first rectifying diode D201 and the positive power input terminal IN+ respectively. The second end of the RC absorption circuit (such as the second ends of the resistor R201 and the resistor R202 in

[0057] ) is electrically connected to the cathode of the first rectifying diode D201 and the first end of the energy storage and filtering unit 103 respectively.

[0058] Since there is a reverse recovery spike voltage in the rectifying diode, a large amount of ringing will be generated, becoming a high-frequency differential mode interference source of the circuit. These high-frequency noise sources can be conducted to the secondary output of the power supply, or coupled to the primary of the power supply through the transformer, thus bringing differential mode noise to the circuit. When a rectifying diode is shunted with an RC absorption circuit, the high-frequency noise of the circuit can be effectively reduced, and at the same time, the high-frequency oscillation voltage generated at both ends of the rectifying diode is limited to flow in the small loop formed by the rectifying diode and the RC absorption circuit, reducing the impact on other parts of the circuit.

[0059] The positive electrode of the second voltage stabilizing unit is electrically connected to the anode of the second light emitting diode unit. The cathode of the second light emitting diode unit is respectively electrically connected to the positive power input terminal IN+ and the second terminal of the energy storage and filtering unit. The second terminal of the energy storage and filtering unit and the negative electrode of the second voltage stabilizing unit are respectively electrically connected to the negative power input terminal OUT+. Or, the cathode of the second light emitting diode unit is electrically connected to the negative electrode of the second voltage stabilizing unit. The positive electrode of the second voltage stabilizing unit is respectively electrically connected to the positive power input terminal IN+ and the second terminal of the energy storage and filtering unit. The second terminal of the energy storage and filtering unit and the anode of the second light emitting diode unit are respectively electrically connected to the negative power input terminal OUT+.

[0060] The second voltage stabilizing unit is used to conduct reversely when its terminal voltage is greater than the working reference voltage.

[0061] Among them, the functions of the second voltage stabilizing unit and the second light emitting diode unit are basically the same as those of the above-mentioned first voltage stabilizing unit and the first light emitting diode unit. The difference is that the setting directions of the two parts are different. After setting the second light emitting diode unit, it can protect the first light emitting diode unit against reverse voltage without setting a rectifying unit. Similarly, the first light emitting diode unit also protects the second light emitting diode unit against reverse voltage.

[0062] Among them, the second voltage stabilizing unit can also include a zener diode or a TVS tube.

[0063] As Figure 3 shown, in one embodiment, the energy storage and filtering unit 103 includes an input filtering capacitor C202, an input filtering capacitor C203, an input discharge resistor R213, a filtering inductor L201, an output filtering capacitor C204, and an output discharge resistor R211.

[0064] The first terminal of the input filtering capacitor C202 is respectively electrically connected to the positive power input terminal IN+, the first terminal of the input filtering capacitor C203, the first terminal of the input discharge resistor R213, and the first terminal of the filtering inductor L201. The second terminal of the filtering inductor L201 is respectively electrically connected to the first terminal of the output filtering capacitor C204 and the first terminal of the output discharge resistor R211. The second terminals of the input filtering capacitor C202, the input filtering capacitor C203, the input discharge resistor R213, the output filtering capacitor C204, and the output discharge resistor R211 are respectively electrically connected to the negative power input terminal OUT+.

[0065] Among them, the input filtering capacitor C202, the input filtering capacitor C203, the filtering inductor L201, and the output filtering capacitor C204 form a π-type filtering circuit to achieve more reliable filtering performance.

[0066] Among them, when the input filter capacitors C202, C203 and the output filter capacitor C204 are fully charged, when the power supply is turned off, the electrical energy stored on them can be discharged through the input discharge resistor R213 and the output discharge resistor R211.

[0067] As Figure 3 shown, a voltage stabilizing diode ZD202 is added to divide the voltage of the light-emitting diode LED201, so that the voltage across the light-emitting diode LED201 can drop below 0.7V faster after the power supply is turned off, thereby achieving the purpose of quickly turning off the light-emitting diode LED201 with low power consumption. Among them, the reference voltage of the voltage stabilizing diode ZD202 can be set to different values according to different power supply output voltages. The value range of the reference voltage of the voltage stabilizing diode ZD202 can be between 3.3 - 50V, and the current limiting resistor R212 is set between 1 - 910KΩ.

[0068] Among them, different power supply output voltages are different. For example, some power supply outputs are 5V, some are 12V, some are 19V, some are 48V, and some are 54V. When the output voltage is different, the reference voltage value of the voltage stabilizing diode ZD202 needs to be changed accordingly to control the turn-off time of the light-emitting diode LED201 within 10S.

[0069] Specifically: when the power supply is working, after being rectified by the first rectifier diode D201 and the second rectifier diode D202, the input filter capacitors C202, C203, and the output filter capacitor C204 are charged. At this time, the voltage across the voltage stabilizing diode ZD202 will exceed the reference voltage. Due to the current limiting effect of the current limiting resistor R212, there is current flowing through the voltage stabilizing diode ZD202, and at this time the light-emitting diode LED201 is lit. On the contrary, when the power supply is turned off, the voltages originally stored in the input filter capacitors C202, C203, and the output filter capacitor C204 discharge the input discharge resistor R213 and the output discharge resistor R211. When the output voltage discharges to less than the reference voltage of the voltage stabilizing diode ZD202, there is no current flowing through the voltage stabilizing diode ZD202, and at this time the light-emitting diode LED201 goes out.

[0070] For example: when the power supply outputs a voltage of 54V, if there is no voltage stabilizing diode ZD202, then the voltage across the light-emitting diode LED201 is 54V. If the light-emitting diode LED201 is to be turned off, it needs to drop from 54V to less than 0.7V, and this time will be very long; while if the reference voltage of the voltage stabilizing diode ZD202 is taken as 50V, then the voltage across the light-emitting diode LED201 is 54 - 50 = 4V. After dropping from 4V to 0.7V, the light-emitting diode LED201 will go out, and this time will be greatly shortened.

[0071] Second aspect, in one embodiment, the present utility model provides an electrical device, including the power supply circuit in any of the above embodiments.

[0072] Through the above electrical device, a corresponding first voltage stabilizing unit is provided and connected in reverse series with the indicating unit. When the power supply is turned off, when the terminal voltage of the first voltage stabilizing unit is lower than the working reference voltage, it will be cut off, thereby turning off the indicating unit, so that the discharge of the energy storage and filtering unit can only maintain the indicating unit to work for a short period of time, reducing the indication deviation of the indicating function.

[0073] In the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not described in detail in a certain embodiment, reference can be made to the detailed descriptions of other embodiments above, and details will not be repeated here.

[0074] The above has introduced in detail a power supply circuit and an electrical device provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

[0075] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: a first voltage stabilizing unit, an indicating unit, and an energy storage and filtering unit; The negative electrode of the first voltage stabilizing unit is electrically connected to the negative electrode of the indicating unit. The positive electrode of the indicating unit is respectively electrically connected to the positive power input terminal and the first end of the energy storage and filtering unit. The second end of the energy storage and filtering unit and the positive electrode of the first voltage stabilizing unit are respectively electrically connected to the negative power input terminal; or, the positive electrode of the indicating unit is electrically connected to the positive electrode of the first voltage stabilizing unit. The negative electrode of the first voltage stabilizing unit is respectively electrically connected to the positive power input terminal and the first end of the energy storage and filtering unit. The second end of the energy storage and filtering unit and the negative electrode of the indicating unit are respectively electrically connected to the negative power input terminal; The first voltage stabilizing unit is used to conduct reversely when its terminal voltage is greater than the working reference voltage.

2. The power supply circuit according to claim 1, wherein The first voltage stabilizing unit includes a first voltage stabilizing diode or a first TVS tube.

3. The power supply circuit according to claim 1, wherein The indicating unit includes a first light-emitting diode unit.

4. The power supply circuit according to claim 3, characterized in that, The power supply circuit further includes a rectifying unit; The input terminal of the rectifying unit is electrically connected to the positive power input terminal; The output terminal of the rectifying unit is respectively electrically connected to the first end of the energy storage and filtering unit and the anode of the first light-emitting diode unit, or the output terminal of the rectifying unit is respectively electrically connected to the first end of the energy storage and filtering unit and the negative electrode of the first voltage stabilizing unit.

5. The power supply circuit according to claim 4, characterized in that, The rectifying unit includes a first rectifying diode; The anode of the first rectifying diode is electrically connected to the positive power input terminal; The cathode of the first rectifying diode is respectively electrically connected to the first end of the energy storage and filtering unit and the anode of the first light-emitting diode unit, or the cathode of the first rectifying diode is respectively electrically connected to the first end of the energy storage and filtering unit and the negative electrode of the first voltage stabilizing unit.

6. The power supply circuit according to claim 5, characterized in that The rectifying unit further includes a second rectifying diode; The anode of the second rectifying diode is respectively electrically connected to the anode of the first rectifying diode and the positive power input terminal. The cathode of the second rectifying diode is respectively electrically connected to the cathode of the first rectifying diode and the first end of the energy storage and filtering unit.

7. The power supply circuit according to claim 5, characterized in that, The rectifying unit further includes an RC absorption circuit; The first end of the RC absorption circuit is respectively electrically connected to the anode of the first rectifying diode and the positive power input terminal. The second end of the RC absorption circuit is respectively electrically connected to the cathode of the first rectifying diode and the first end of the energy storage and filtering unit.

8. The power supply circuit according to claim 3, wherein, The power supply circuit further includes a second voltage stabilizing unit, and the indicating unit further includes a second light-emitting diode unit; The positive electrode of the second voltage stabilizing unit is electrically connected to the anode of the second light emitting diode unit. The cathode of the second light emitting diode unit is respectively electrically connected to the positive power input terminal and the second end of the energy storage and filtering unit. The second end of the energy storage and filtering unit and the negative electrode of the second voltage stabilizing unit are respectively electrically connected to the negative power input terminal; or, the cathode of the second light emitting diode unit is electrically connected to the negative electrode of the second voltage stabilizing unit. The positive electrode of the second voltage stabilizing unit is respectively electrically connected to the positive power input terminal and the second end of the energy storage and filtering unit. The second end of the energy storage and filtering unit and the anode of the second light emitting diode unit are respectively electrically connected to the negative power input terminal. The second voltage stabilizing unit is used to conduct reversely when its terminal voltage is greater than the working reference voltage.

9. The power supply circuit according to claim 1, wherein, The energy storage and filtering unit includes an input filter capacitor, an input discharge resistor, a filter inductor, an output filter capacitor, and an output discharge resistor. The first end of the input filter capacitor is respectively electrically connected to the positive power input terminal, the first end of the input discharge resistor, and the first end of the filter inductor. The second end of the filter inductor is respectively electrically connected to the first end of the output filter capacitor and the first end of the output discharge resistor. The second end of the input filter capacitor, the second end of the input discharge resistor, the second end of the output filter capacitor, and the second end of the output discharge resistor are respectively electrically connected to the negative power input terminal.

10. An electrical device, characterized in that, It includes the power supply circuit according to any one of claims 1 to 9.

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