CN212086078U

CN212086078U - Intelligent power circuit and power supply

Info

Publication number: CN212086078U
Application number: CN202020161549.XU
Authority: CN
Inventors: 王小琼
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-19
Filing date: 2020-02-11
Publication date: 2020-12-04
Anticipated expiration: 2030-02-11
Also published as: CN210536529U

Abstract

The embodiment of the utility model provides an intelligent power supply circuit and power belongs to power technology and transformer field. The intelligent power supply circuit is arranged on a line between a power supply and a load, and comprises the following modules which are arranged in series on the line between the power supply and the load in any sequence: the filtering module is used for filtering the power output signal; the rectification module is used for rectifying the power output signal; and the voltage identification protection module is used for identifying whether the output signal of the power supply is matched with the load or not, and if not, the connection between the power supply and the load is disconnected. The utility model discloses effectively avoided among the prior art because of bridge rectifier circuit itself has that protect function is imperfect, the reliability is low, the filter effect is poor, power factor low grade factor and lead to load circuit or electrical apparatus impaired phenomenon to take place.

Description

Intelligent power circuit and power supply

Technical Field

The utility model relates to a power technology and transformer field specifically relate to an intelligent power supply circuit and power.

Background

At present, in the field of transformers, a voltage conversion circuit is often required to be configured to realize voltage adaptation of a power supply end and a load end. For example, the servo power supply needs to perform AC-DC (alternating current-direct current) conversion of voltage between the servo power supply and a servo system, a frequency conversion system, a stepping system, and the like through a voltage conversion circuit. However, taking a servo power supply as an example, a part of the voltage conversion circuit in the prior art is a half-wave rectifier circuit, which is a simple circuit composed of bridge rectifier circuits, and has the defects of incomplete protection function, low reliability, poor filtering effect, low power factor, and the like, and external devices such as a load servo driver, a frequency converter, a step driver, and the like, which are connected with the half-wave rectifier circuit, are easily damaged. In addition, the half-wave rectification circuit has the defect of complex processing technology, so that the production efficiency is low.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide an intelligent power supply circuit and power for at least partly solve above-mentioned technical problem.

In order to achieve the above object, an embodiment of the present invention provides an intelligent power circuit, which is disposed on a line between a power supply and a load, and includes the following modules arranged in series in any order on the line between the power supply and the load: the filtering module is used for filtering the power supply output signal of the power supply; the rectification module is used for rectifying the power supply output signal; and the voltage identification protection module is used for identifying whether the power supply output signal is matched with the load or not, and if not, the connection between the power supply and the load is disconnected.

Optionally, the smart power circuit further comprises: and the soft start protection module is arranged on a line between the power supply and the load, is connected with the filtering module, the rectifying module and the voltage identification protection module in series and is used for controlling the size of the corresponding power supply output signal when the load is started.

Optionally, the filtering module is comprised of one or more of a common mode coil, a magnetic loop, and a filtering element.

Optionally, when the power supply is a three-phase ac power supply, and the filtering module is a common-mode coil module including a plurality of common-mode coils: each phase of each of the three-phase ac power supply is connected to at least one of the plurality of common mode coils, or all three-phase four wires of the three-phase ac power supply are connected to at least one of the plurality of common mode coils.

Optionally, the rectifier module comprises a plurality of rectifier diodes connected in series and/or in parallel.

Optionally, the voltage identification protection module includes: the voltage sensing element or the voltage sensing circuit is arranged on a line between the power supply and the load and is used for sensing a voltage value in the output signal of the power supply; and the first on-off element is arranged on a line between the power supply and the load, is connected with the voltage sensing element or the voltage sensing circuit, and is used for judging whether the voltage value is matched with the rated voltage of the load or not, disconnecting the power supply from the load if the voltage value is not matched with the rated voltage of the load, and connecting the power supply from the load if the voltage value is matched with the rated voltage of the load.

Optionally, the voltage sensing element is a varistor, and/or the first switching element is at least one relay or a thyristor.

Optionally, the soft start protection module includes: the second on-off element is arranged on a line between the power supply and the load and used for controlling the on-off of the line between the power supply and the load; and the thermistor is connected between the input end and the output end of the second on-off element and used for controlling the current value in the power output signal output to the load through the second on-off element to change from small to large when the load is started.

Optionally, the second switching element is a relay or a thyristor.

On the other hand, the embodiment of the utility model provides a still provide a power, this power includes foretell intelligent power supply circuit.

Through the technical scheme, the utility model discloses intelligent power supply circuit and power beneficial effect who has are: the utility model discloses intelligent power supply circuit and power pass through the production of filter module suppression voltage peak, and recognition through voltage identification protection module guarantees that load input voltage meets the requirements, realizes the voltage transformation through rectifier module to formed multiple protection, effectively avoided among the prior art because of bridge rectifier circuit itself has that protect function is imperfect, the reliability is low, the filtering effect is poor, factor such as power factor is low leads to load circuit or electrical apparatus impaired phenomenon to take place. In addition, compare in adopting half-wave rectifier circuit, the utility model discloses intelligent power supply circuit still has advantages such as production efficiency height, processing technology are simple.

Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:

fig. 1 is a schematic structural diagram of an intelligent power supply circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of an intelligent power supply circuit in a first example of the embodiment of the present invention;

fig. 3 is a diagram illustrating an exemplary structure of a voltage identification protection module according to a first exemplary embodiment of the present invention;

fig. 4 is an exemplary block diagram of a soft start protection module in a first example of an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of an intelligent power supply circuit in a second example of the embodiment of the present invention;

fig. 6 is a schematic circuit diagram of an intelligent power supply circuit in a third example of the embodiment of the present invention; and

fig. 7 is a schematic circuit diagram of a voltage sensing circuit in a third example of the embodiment of the present invention.

Description of the reference numerals

100. An intelligent power supply circuit; 200. a power source; 300. a load;

110. a filtering module; 120. a rectification module; 130. a voltage identification protection module; 140. a soft start protection module;

131. a first on-off element.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is only intended to illustrate and explain embodiments of the present invention, and is not intended to limit embodiments of the present invention.

The term "connected" as used in the embodiments of the present invention is mainly used to mean "electrically connected", which is used to describe signal connection between two components, for example, through circuit connection, and the term "connected" may be direct electrical connection between two components or indirect electrical connection through other components or circuits. In addition, the terms "first" and "second" used in the embodiments of the present invention are only used to illustrate different elements, and do not indicate the number of elements.

Fig. 1 is a schematic structural diagram of an intelligent power circuit according to an embodiment of the present invention, where the intelligent power circuit is disposed on a line between a power source and a load powered by the power source, where the power source is, for example, a servo power source, and the load may be a load circuit or a load element, such as a servo driver, a frequency converter, a step driver, and the like.

As shown in fig. 1, the intelligent power circuit 100 according to the embodiment of the present invention includes the following modules arranged in series in any order on the line between the power source 200 and the load 300: a filtering module 110, configured to perform filtering processing on a power output signal of the power supply 200; the rectifying module 120 is configured to perform rectification processing on the power output signal; and a voltage identification protection module 130, configured to identify whether the power output signal is adapted to the load 300, and if not, disconnect the connection between the power supply 200 and the load 300.

In a preferred embodiment, the intelligent power supply circuit further comprises: the soft-start protection module 140 is disposed on a line between the power supply 200 and the load 300, and is connected in series with the filtering module 110, the rectifying module 120 and the voltage identification protection module 130, for controlling the magnitude of the corresponding power supply output signal when the load 300 is started.

It should be noted that fig. 1 is only an example, and any arrangement of the filtering module 110, the rectifying module 120, the voltage identification protection module 130, and the soft-start protection module 140 on the line between the power supply 200 and the load 300 may be adjusted as needed. Three examples of the intelligent power supply circuit of the embodiments of the present invention are described below.

First, first example

Fig. 2 is a schematic circuit diagram of an intelligent power supply circuit in a first example of the embodiment of the present invention. As shown in fig. 2, in the first example, the power source 200 is a 380V three-phase ac power source, wherein UVW represents U, V, W three phases corresponding to a live line A, B, C, and N represents a neutral line input, and the load 300 is a load circuit formed by two rectifying tube groups, wherein a first rectifying tube group is formed by rectifying tubes DIODE1-DIODE6 and a capacitor C1, and a second rectifying tube group is formed by rectifying tubes DIODE7-DIODE10 and a capacitor C2.

Referring to fig. 2, in this first example, the filtering module 110 may be a common mode coil module including a plurality of common mode coils, and each phase of the power supply 200 is connected to at least one common mode coil of the plurality of common mode coils, for example, U, V, W and N lines are each connected to one common mode coil. In other examples, the three-phase four-wires of the three-phase ac power source may all be connected to at least one common mode coil of the plurality of common mode coils, e.g., U, V, W and N-four wires are collectively connected to the same common mode coil.

The embodiment of the present invention provides an embodiment, the main function of the filtering module 110 is to perform filtering processing on the power output signal, so as to suppress the generation of voltage spike, and buffer current impact, thereby preventing the elements in the effective protection load 300 from being damaged. Taking the first example as an example, the common mode coil can reduce the impact of the three-phase alternating current power supply on the load circuit or the load electrical appliance when the load is started, reduce the strong impact on various electronic elements inside the load circuit or the electrical appliance, inhibit the voltage mutation from damaging the electronic elements, improve the filtering effect, and achieve the function of protecting the load circuit or the load electrical appliance. The common mode coil has the advantages of simple processing technology, low price, easy installation by matching with a three-phase alternating current power supply and the like. In other embodiments, the filter module may also be composed of a magnetic loop, or a filter element (such as a filter capacitor and a filter inductor), or two or more of a common mode coil, a magnetic loop and a filter element.

Referring again to FIG. 2, in this first example, the rectifier module 120 may include a plurality of rectifier DIODEs, such as the parallel rectifier DIODEs DIODE11-DIODE13 of FIG. 2. In the embodiment of the present invention, the main function of the rectifying module 120 is to perform rectifying processing on the filtered power output signal to realize AC-DC conversion, so that it can be understood that besides the parallel rectifying diode mode in fig. 2, a plurality of rectifying diodes connected in series can be also used, and a plurality of rectifying diodes can be formed into a package to realize rectifying processing, or any combination of the three modes of series connection, parallel connection and package can be also used to configure and realize the connection mode of a plurality of rectifying diodes used for realizing rectifying processing here.

Further, as shown in fig. 2, in the first example, one end of the soft-start protection module 140 is connected to the output end of the rectification module 120, and the other end is connected to one end of the voltage identification protection module 130, and the other end of the voltage identification protection module 130 is connected to the load 300.

The voltage identification protection module 130 is mainly used to identify whether the power output signal is adapted to the load, so that according to its function, the voltage identification protection module 130 may include: a voltage sensing element, disposed on a line between the power supply 200 and the load 300, for sensing a voltage value in the power supply output signal; and the first on-off element is arranged on a line between the power supply 200 and the load 300, is connected with the voltage sensing element, and is used for judging whether the voltage value is matched with the rated voltage of the load or not, disconnecting the power supply 200 from the load 300 if the voltage value is not matched with the rated voltage of the load, and connecting the power supply 200 with the load 300 if the voltage value is matched with the rated voltage of the load.

Referring to the circuits of fig. 2 and 3, the strong current of the three-phase ac power source is changed into weak current through the filtering module 110, the rectifying module 120, the switching power source circuit and/or the battery (for example, the weak current of 24V is provided by the switching power source circuit or the battery), etc., to turn on the first on-off element, so that the circuit operates to supply power to the load. In addition, the first on-off element can be directly connected with a zero line of a three-phase alternating current power supply and is used for quickly cutting off the power supply when the voltage value is not suitable for the rated voltage of the load. In addition, the mismatch between the voltage value and the rated voltage of the load may be caused by the reverse connection between the neutral line and the live line. Therefore, for example, for a three-phase four-wire ac power supply, when the zero line and the live line are connected reversely, the voltage identification and protection module 130 identifies that the external inflow voltage does not meet the load voltage requirement, and then quickly cuts off the input current of the load circuit, so that the internal electronic components of the load circuit are not impacted by a huge current; when the zero line and the live line are normally connected, the voltage identification protection module 130 is in a closed state, so that current is normally input into the load 300 to be normally used by the load 300. In the process, the phenomenon that huge current generated by connecting the zero line and the live line impacts a load circuit or an electric appliance is avoided. It should be noted that the embodiment of the present invention does not limit the number of the first on-off elements, and those skilled in the art can set the number as needed.

Fig. 3 is a diagram illustrating an exemplary structure of the voltage identification protection module 130 according to a first example of the embodiment of the present invention. As shown in fig. 3, the voltage sensing elements may be voltage dependent resistors R13, 2R13, and 3R13, and the three voltage dependent resistors R13, 2R13, and 3R13 are respectively connected to the live line A, B, C for sensing the voltage values of the UVW three phases. The first on-off element may be a relay J1 (the J1 may also represent a thyristor), the relay J1 is connected with the voltage dependent resistors R13, 2R13, 3R13 and the neutral line N through some auxiliary elements, when the voltages of the live line a, the live line B, the live line C and the neutral line are all 220V at the same time through the voltage dependent resistors R13, 2R13, and 3R13, the relay J1 is closed and connected, so that the connection between the power supply 200 and the load 300 is switched on, and the voltage of any one of the live line and the neutral line is 380V, and the relay J1 is immediately disconnected, so that the connection between the power supply 200 and the load 300 is also disconnected, and the elements in the load 300 are prevented from being damaged due to voltage mismatch.

It should be noted that, in fig. 3, besides the piezoresistors R13, 2R13, 3R13 and the relay J1, the device also includes various elements such as a resistor, a capacitor, a diode, and a transistor, but these elements belong to a part of a conventional peripheral circuit of the relay J1, can be used to implement conventional functions such as current limiting, voltage limiting, and the like, and can be configured arbitrarily by a person skilled in the art, and they do not substantially affect the intelligent power circuit of the embodiment of the present invention, so detailed description is omitted here.

In addition, in other embodiments, except piezo-resistor, can also realize the response to mains voltage through opto-coupler, mutual-inductor, transformer, singlechip etc. the embodiment of the utility model provides a do not restrict to this.

Further, the soft-start protection module 140 is mainly configured to control a magnitude of the power output signal corresponding to the load when the load is started, so that according to the function of the soft-start protection module 140, the soft-start protection module 140 includes: a second switching element, provided on a line between the power supply 200 and the load 300, for controlling on/off of the line between the power supply 200 and the load 300; and the thermistor is connected between the input end and the output end of the second on-off element and used for controlling the current value in the power output signal output to the load 300 through the second on-off element to change from small to large when the load is started. For example, the thermistor is used for providing a current which is not larger than the setting of the thermistor to pass through so as to provide a power supply for the control part, and the on-off element can provide a large load current after being normally switched on. Accordingly, the soft start protection module 140 controls the current to be small to large during starting to realize the power supply function to the load, thereby avoiding the phenomena of imperfect protection function, low reliability, poor filtering effect and the like caused by the huge current generated during starting of the load.

Fig. 4 is a diagram illustrating an exemplary structure of the soft-start protection module 140 according to the first exemplary embodiment of the present invention. As shown in fig. 4, the

lines

1, 2, and 3 correspond to the outputs of the previous modules, respectively, the second switching element may be a relay J2 (the J2 may also represent a thyristor), the thermistors are, for example, thermistors RA, RB, and RC, the thermistors are used for supplying the working power of the control part such as the relay J2 by a small current, so as to turn on the relay J2, and a large current may be supplied to the load 300 through the relay J2. When the thermistor current is too large, the resistance value is rapidly increased, namely, the relay J2 is disconnected, so that the working power supply of the relay J2 cannot be provided, and the control of the current from small to large is realized. Accordingly, the soft start protection module 140 implements a soft start process of the circuit through the thermistor and the second switching element, so that a current value in the circuit can be gradually increased, various elements in the load have an adaptation process, a large current change rate is not generated, and a protection effect is generated on the load.

To sum up, for the first example, when the load 300 is powered on for use, the current of the three-phase alternating current can suppress the generation of the voltage spike after passing through the common mode coil, and then passes through the rectifier module 120 to be connected to the soft start protection module 140, and the soft start protection module 140 controls the large current required by the load to be provided after passing through the small current, so as to avoid the phenomena of incomplete protection function, low reliability, poor filtering effect and the like caused by the generation of huge current when the load is started; and then the load input voltage is ensured to meet the requirement through the recognition action of the voltage recognition protection module 130, and the artificial power connection error is avoided.

Second and third examples

Fig. 5 is a schematic circuit structure diagram of an intelligent power circuit in a second example of the embodiment of the present invention, and compared with fig. 2, the second example is different from the first example mainly in the positions of the voltage identification protection module 130 and the soft start protection module 140. In this second example, one end of the voltage identification protection module 130 is connected to the output end of the filtering module, the other end of the voltage identification protection module is connected to the input end of the rectifying module 120, and one end of the soft start protection module 140 is connected to the output end 120 of the rectifying module, and the other end of the soft start protection module is connected to the load 300.

For the second example, when the load 300 is powered on for use, the current of the three-phase alternating current can inhibit the generation of voltage spikes after passing through the common mode coil, and the input voltage of the load can be ensured to meet the requirement through the recognition function of the voltage recognition protection module 130, so that the artificial power connection error is avoided; the current output by the voltage identification protection module 130 is connected with the soft start protection module 140 through the rectification module 120, and the soft start protection module 140 controls the current to pass through a small current first and then provide a large current required by a load, so that the phenomenon that elements of the load connected with the half-wave rectification circuit are damaged due to factors such as incomplete protection function, low reliability, poor filtering effect and low power factor existing in the bridge circuit in the prior art is effectively avoided.

In addition, no matter first example or second example, compare in adopting half-wave rectifier circuit, the utility model discloses the intelligent power supply circuit has only configured filtering module 110, rectifier module 120, voltage identification protection module 130 and soft start protection module 140, has advantages such as production efficiency height, processing technology are simple.

Other details of this second example may refer to the first example and are not described herein.

Third, third example

Fig. 6 is a schematic diagram of a circuit structure of an intelligent power supply circuit in a third example of the embodiment of the present invention, the intelligent power supply circuit of the third example is not configured with the soft start protection module 140, the voltage identification protection module 130 is disposed on a line between the rectifier module 120 and the load 300, and the first on-off element 131 is two relays KA and KB. Specifically, the line 1 and the line 2 behind the rectifying module 120 are respectively connected to the relays KA and KB, and the turn-off and the pull-in of the relays KA and KB can be controlled by the voltage sensing circuit shown in fig. 7. Alternatively, a two-way relay may be used instead of two relays KA, KB, i.e. a two-way relay may control both

lines

1 and 2. It is understood that the relays KA, KB can be replaced with on-off elements such as thyristors.

Further, unlike the voltage sensing element employed in the first example, in this third example, the voltage identification protection module may sense the voltage value in the power output signal through a pre-configured voltage sensing circuit. Fig. 7 is a schematic circuit diagram of a voltage sensing circuit in a third example of the embodiment of the present invention, the voltage sensing circuit is adapted to the intelligent power circuit shown in fig. 6, and a person skilled in the art can combine the two to select an electronic component with appropriate parameters to complete voltage sensing and on-off component control.

With reference to fig. 6 and fig. 7, in this third example, the control of the first switching element 131 by the voltage identification protection module 130 may include the following situations:

1) when the three-phase power supply is too high or too low, the relays or the controllable silicon on the line 1 and the line 2 are immediately disconnected, so that the burning of a load caused by the burning of a contactor in a line due to undervoltage or high voltage is effectively avoided;

2) when one phase of the three-phase power supply is in phase failure, on-off elements such as relays or controllable silicon on the line 1 and the line 2 are immediately disconnected, so that the load is prevented from being damaged due to phase failure;

3) when the zero line is not connected, on-off elements such as relays or silicon controllers on the line 1 and the line 2 are immediately disconnected, so that the load is prevented from being damaged due to the fact that the zero line is not connected;

4) when the zero line and the live line are reversely connected, the on-off elements such as the relay or the controllable silicon on the line 1 and the line 2 are immediately disconnected, so that the load damage caused by the reverse connection of the zero line and the live line is avoided;

5) when the rectifier module 120 is damaged, the relays or the on-off elements such as silicon controllers on the line 1 and the line 2 are immediately turned off, so that the load damage caused by the unpredictable ultrahigh voltage and ultrahigh current breakdown of the rectifier module 120 due to lightning stroke and the like is avoided.

In addition, referring to fig. 7, the voltage sensing circuit is further configured with an indicator light, and the states of malfunction, normal operation, and power-on indication caused by the above 5 situations can be displayed by the indicator light in the voltage sensing circuit, such as a yellow light in a power-on state, a green light in a normal operation state, a red light in a malfunction state, and the like. Therefore, the user can clearly see the working state of the product and easily troubleshoot faults.

Accordingly, the third example can quickly determine whether the power consumption voltage of the load is satisfied through the voltage identification protection module, and realize quick power-off when the power consumption voltage is not satisfied.

For other details of the third example, reference may be made to the foregoing two examples, which are not described herein again.

It should be noted that, besides the three examples shown above, the arrangement of the filtering module 110, the rectifying module 120, the voltage identification protection module 130, and the soft start protection module 140 on the line between the power supply 200 and the load 300 may also be adjusted as needed, and any arrangement thereof should fall within the scope of the embodiments of the present invention.

The embodiment of the utility model provides a still provide a power, this power includes foretell intelligent power supply circuit. The power source is, for example, a servo power source, and the structure thereof can refer to fig. 2, fig. 5, fig. 6 and the related description, which are not repeated herein.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An intelligent power supply circuit, characterized in that the intelligent power supply circuit is provided on a line between a power supply and a load, and comprises the following modules arranged in series in any order on the line between the power supply and the load:

the filtering module is used for filtering the power supply output signal of the power supply;

the rectification module is used for rectifying the power supply output signal; and

and the voltage identification protection module is used for identifying whether the power supply output signal is matched with the load or not, and if not, the connection between the power supply and the load is disconnected.

2. The smart power supply circuit of claim 1, further comprising:

and the soft start protection module is arranged on a line between the power supply and the load, is connected with the filtering module, the rectifying module and the voltage identification protection module in series and is used for controlling the size of the corresponding power supply output signal when the load is started.

3. The smart power circuit of claim 1, wherein the filtering module is comprised of one or more of a common mode coil, a magnetic loop, and a filtering element.

4. The smart power circuit of claim 3 wherein the power source is a three-phase ac power source and the filtering module is a common mode coil module comprising a plurality of common mode coils:

each phase of the three-phase AC power supply is connected to at least one common mode coil of the plurality of common mode coils, or

The three-phase four-wire of the three-phase alternating current power supply is all connected to at least one common mode coil of the plurality of common mode coils.

5. The smart power circuit of claim 1, wherein the rectifier module comprises a plurality of rectifier diodes connected in series and/or parallel.

6. The smart power circuit of claim 1, wherein the voltage identification protection module comprises:

the voltage sensing element or the voltage sensing circuit is arranged on a line between the power supply and the load and used for sensing a voltage value in the output signal of the power supply; and

the first on-off element is arranged on a line between the power supply and the load, is connected with the voltage sensing element or the voltage sensing circuit, and is used for judging whether the voltage value is matched with the rated voltage of the load or not, disconnecting the power supply from the load if the voltage value is not matched with the rated voltage of the load, and connecting the power supply from the load if the voltage value is not matched with the rated voltage of the load.

7. The intelligent power supply circuit according to claim 6, wherein the voltage sensing element is a voltage dependent resistor and/or the first switching element is at least one relay or thyristor.

8. The smart power circuit of claim 2, wherein the soft-start protection module comprises:

the second on-off element is arranged on a line between the power supply and the load and used for controlling the on-off of the line between the power supply and the load;

and the thermistor is connected between the input end and the output end of the second on-off element and used for controlling the current value in the power output signal output to the load through the second on-off element to change from small to large when the load is started.

9. A power supply, characterized in that it comprises an intelligent power supply circuit according to any one of claims 1 to 8.