CN217282715U

CN217282715U - Driving power supply

Info

Publication number: CN217282715U
Application number: CN202220471007.1U
Authority: CN
Inventors: 赵善建; 李军; 魏勇
Original assignee: Guangdong Mingfeng Power Technology Co ltd
Current assignee: Guangdong Mingfeng Power Technology Co ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-08-23
Anticipated expiration: 2032-03-03

Abstract

The utility model discloses a driving power supply, including drive module, the voltage regulating module, get electric module and switch module, the input of voltage regulating module is used for being connected with external power source, the output of voltage regulating module is used for being connected with the load, drive module's output and voltage regulating unit are connected in order to control the work of voltage regulating unit, the input of getting the electric module is connected with the output of voltage regulating module, the output of getting the electric module is connected with drive module's feed end linked switch module and drive module's feed end, switch module's one end is connected with voltage regulating module's input, switch module's the other end is connected with drive module's feed end and switch module and get the electric module and be connected in order can form trigger signal according to the output of getting the electric module, switch module can switch over in on-state or off-state according to trigger signal. The utility model discloses can reduce drive power supply's power loss.

Description

Driving power supply

Technical Field

The utility model relates to a drive power supply field, in particular to drive power supply.

Background

Present driving power supply generally includes the pressure regulating module, driving module and gets the electric module, the input of pressure regulating module is used for being connected with external power source, the output of pressure regulating module is used for being connected with the load, driving module's output is connected with the pressure regulating module and works with control pressure regulating module, it is connected with the output of pressure regulating module and driving module's supply end respectively to get the electric module, driving module's supply end can also be connected with the input of pressure regulating module through transmission module.

When the driving power supply is just started, the driving module and the electricity taking module do not work, after the external power supply is connected with the input end of the voltage regulating module, the transmission module supplies power to the driving module, so that the driving module is started, the voltage regulating module and the electricity taking module normally work, the electricity taking module can continuously supply power to the power supply end of the driving module, and the driving module is maintained to work. At this time, the driving module does not need an external power supply to supply power to the driving module through the transmission module, but the transmission module still keeps a path, and the continuous normal operation of all elements in the transmission module causes the power loss of the driving power supply to be large.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of current technical problem, for this reason, the utility model provides a drive power supply can reduce the power loss.

According to the utility model, the driving power supply comprises a driving module, a voltage regulating module, a power taking module and a switch module, wherein the input end of the voltage regulating module is used for being connected with an external power supply, the output end of the voltage regulating module is used for being connected with a load, the output end of the driving module is connected with the voltage regulating module to control the voltage regulating module to work, the input end of the power taking module is connected with the output end of the voltage regulating module, the output end of the power taking module is connected with the power supply end of the driving module, the switch module is connected with the power supply end of the driving module, one end of the switch module is connected with the input end of the voltage regulating module, the other end of the switch module is connected with the power supply end of the driving module and the switch module is connected with the power taking module to form a trigger signal according to the output of the power taking module, the switch module can be switched between an on state and an off state according to the trigger signal.

According to the utility model discloses a driving power supply has following beneficial effect at least:

the utility model discloses drive power supply, when just starting to start, the voltage regulating module and get the electric module and all not yet work, switch module does not form triggering signal, switch module switches to on-state, make drive module start, and then make the voltage regulating module and get the electric module and begin work, start the back at drive module, switch module forms triggering signal, switch module switches to the off-state, the consumption of at least part component in the switch module reduces, it lasts the power supply end power supply to drive module to get the electric module, maintain drive module work, compare in prior art, reduce drive power supply power loss.

According to the utility model discloses a some embodiments, switch module includes sampling unit and switch tube Q3, the sampling unit is provided with the sample end, the sampling unit with the input of voltage regulating module is connected, switch tube Q3's input with drive module's feeder ear and get the electric module and connect and switch tube Q3 basis get the output of electric module and be in switch tube Q3's input forms trigger signal, switch tube Q3's controlled end with the sample end is connected with the controlled end of switch tube Q3 forms sampling signal, switch tube Q3's output with the input of voltage regulating module is connected, switch tube Q3 can be based on trigger signal and sampling signal switches in on-state or off-state.

According to some embodiments of the utility model, switch module includes sampling unit and comparator, the sampling unit is provided with the sample termination, the sampling unit with the input of pressure regulating module is connected, the positive input of comparator with the sample termination is connected with the positive input of comparator forms sampling signal, the negative pole input of comparator with it connects with to get the electric module the negative pole input of comparator forms trigger signal, the output of comparator with drive module's feed end is connected, the comparator can be based on trigger signal and sampling signal output high level signal or low level signal.

According to some embodiments of the present invention, the sampling unit includes a resistor R3 and a zener diode ZD1, one end of the resistor R3 is connected to the input of the voltage regulation module, the other end of the resistor R3 is connected to the cathode of the zener diode ZD1, the anode of the zener diode ZD1 is connected to ground, the sampling end is located between the other end of the resistor R3 and the cathode of the zener diode ZD 1.

According to some embodiments of the present invention, the sampling unit includes a resistor R3 and a resistor R11, one end of the resistor R3 is connected to the input end of the voltage regulation module, the other end of the resistor R3 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to ground, the other end of the resistor R11 is connected to ground, and the sampling end is disposed between the other end of the resistor R3 and one end of the resistor R11.

According to some embodiments of the present invention, the switch module further comprises a diode D1, the anode of the diode D1 is connected to the input of the voltage regulation module, and the cathode of the diode D1 is connected to the sampling unit and the output of the switch tube Q3, respectively.

According to some embodiments of the utility model, drive module includes control chip U1 and switch tube Q2, control chip U1's feed end respectively with switch module and get the electric module and connect, control chip U1's output with switch tube Q2's controlled end is connected, switch tube Q2's input is connected with ground, switch tube Q2's output with the voltage regulating module is connected.

According to some embodiments of the utility model, control chip U1's feeder terminal with get and be provided with diode D3 between the electric module, diode D3's positive pole with it connects to get the electric module, diode D3's negative pole with control chip U1's feeder terminal is connected.

According to some embodiments of the utility model, the pressure regulating module includes pressure regulating unit, rectification unit and filtering unit, the input of rectification unit with switch module connects, the input of rectification unit is used for being connected with external power source, the output of rectification unit with filtering unit's input is connected, filtering unit's output and drive module's output with the input of pressure regulating unit is connected, the output of pressure regulating unit with it connects to get the electric module, the output of pressure regulating unit is used for being connected with the load.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a circuit schematic of some embodiments of the drive power supply of the present invention;

fig. 2 is a schematic circuit diagram of some other embodiments of the driving power supply of the present invention.

Reference numerals are as follows:

the device comprises a driving module 1, a voltage regulating module 2, a voltage regulating unit 21, a rectifying unit 22, a power taking module 3, a switch module 4 and a sampling unit 41.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the positional or orientational descriptions referred to, for example, the positional or orientational relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the positional or orientational relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The driving power supply according to the utility model, as shown in fig. 1, comprises a driving module 1 and a voltage regulating module 2, get electric module 3 and switch module 4, the input of voltage regulating module 2 is used for being connected with external power source, the output of voltage regulating module 2 is used for being connected with the load, the output of drive module 1 is connected with voltage regulating module 2 in order to control voltage regulating module 2 work, the input of getting electric module 3 is connected with the output of voltage regulating module 2, the output of getting electric module 3 is connected with the power supply end of drive module 1 switch module 4 and the power supply end of drive module 1 are connected, the one end of switch module 4 is connected with the input of voltage regulating module 2, the other end of switch module 4 is connected with the power supply end of drive module 1 and switch module 4 is connected with getting electric module 3 in order can form trigger signal according to the output of getting electric module 3, switch module 4 can switch over in on-state or off-state according to trigger signal.

The utility model discloses drive power supply, when just starting, voltage regulating module 2 and get electric module 3 and all not yet work, switch module 4 does not form trigger signal, switch module 4 switches to the on-state, make drive module 1 start, and then make voltage regulating module 2 and get electric module 3 and begin work, after drive module 1 starts, switch module 4 forms trigger signal, switch module 4 switches to the off-state, the consumption of the at least partial component in switch module 4 reduces, it lasts the power supply to drive module 1 to get electric module 3, maintain drive module 1 work, compare in prior art, reduce drive power supply power loss.

It should be noted that, after the driving power supply is started, no matter the driving power supply is in an idle state or a load state, the switch module 4 is switched to a cut-off state, and the driving module 1 only supplies power by the power taking module 3, so that the power loss of the driving power supply is reduced. Particularly, when the driving power supply is in an idle state, the idle power loss of the driving power supply can be reduced, and the electric energy consumed by the driving power supply during standby can be reduced.

In some embodiments of the utility model, as shown in fig. 1, fig. 2, switch module 4 includes sampling unit 41 and switch tube Q3, sampling unit 41 is provided with the sampling end, sampling unit 41 is connected with voltage regulation module 2's input, switch tube Q3's input and drive module 1's feeder ear and get electric module 3 and be connected and switch tube Q3 forms trigger signal at switch tube Q3's input according to the output of getting electric module 3, switch tube Q3's controlled end is connected with the sampling end and forms sampling signal at the controlled end of switch tube Q3, switch tube Q3's output with voltage regulation module's input is connected, switch tube Q3 can switch in on-state or off-state according to trigger signal and sampling signal.

Specifically, in this embodiment, the operating principle of the switch module 4 is as follows: when the controlled terminal voltage of the switching tube Q3 is greater than the input terminal voltage of the switching tube Q3, the switching tube Q3 is turned on, and at this time, it can be understood that the switching module 4 is in a conducting state; when the controlled terminal voltage of the switching tube Q3 is not greater than the input terminal voltage of the switching tube Q3, the switching tube Q3 is turned off, and it can be understood that the switching module 4 is in a turned-off state. When drive power supply just started, drive module 1, voltage regulating module 2 and get electric module 3 and all do not work, trigger signal did not form this moment, switch tube Q3 switches on, drive module 1 just begins work, and then voltage regulating module 2 and get electric module 3 also normal work, trigger signal forms this moment, and trigger signal's voltage size generally is greater than sampling signal voltage size, lead to switch tube Q3 to the off-state, external power supply no longer supplies power through switch module 4 to drive module 1, reduce drive power supply's power loss.

The switching tube Q3 may be a MOS tube or an IGBT tube. For example, in an embodiment, the switching tube Q3 is an NMOS tube, a gate of the NMOS tube is connected to the sampling end of the sampling unit 41, a source of the NMOS tube is connected to the power supply ends of the power taking module 3 and the driving module 1, respectively, and a drain of the NMOS tube is connected to the input end of the voltage regulating module 2.

In addition, in some embodiments, the input terminal of the voltage regulating module 2 may also be connected to the output terminal of the switching tube Q3 through a series resistor circuit, such as the resistor R5 and the resistor R6 in fig. 1.

The utility model discloses an in some embodiments, switch module 4 includes sampling unit 41 and comparator (not shown in the figure), sampling unit 41 is provided with the sample end, sampling unit 41 is connected with the input of voltage regulation module 2, the positive input end and the sample end of comparator are connected with the positive input end at the comparator and are formed sampling signal, the negative pole input of comparator with get electric module 3 and be connected with the negative pole input at the comparator and form trigger signal, the output of comparator is connected with drive module 1's feeder ear, the comparator can be according to trigger signal and sampling signal output high level signal or low level signal.

Specifically, when the voltage of the positive input terminal of the comparator is greater than the voltage of the negative input terminal of the comparator, the output terminal of the comparator outputs a high level signal, which can be understood as that the switch module 4 is in a conducting state; when the voltage of the positive input end of the comparator is not greater than that of the negative input end of the comparator, the output end of the comparator outputs a low-level signal, which can be understood as that the switch module 4 is in a cut-off state. When drive power supply just started, drive module 1, voltage regulating module 2 and get electric module 3 and all do not work, trigger signal did not form this moment, comparator output high level signal, drive module 1 just begins work, and then voltage regulating module 2 and get electric module 3 also normal work, trigger signal forms this moment, and trigger signal's voltage size is generally greater than sampling signal voltage size, lead to comparator output low level signal, external power supply no longer supplies power to drive module 1 through switch module 4, reduce drive power supply's power loss.

In some embodiments of the present invention, as shown in fig. 1, the sampling unit 41 includes a resistor R3 and a zener diode ZD1, one end of the resistor R3 is connected to the input end of the voltage regulation module 2, the other end of the resistor R3 is connected to the cathode of the zener diode ZD1, the anode of the zener diode ZD1 is connected to the ground, and the sampling end is disposed between the other end of the resistor R3 and the cathode of the zener diode ZD 1.

Specifically, when the driving power supply starts to operate, the zener diode ZD1 is in a breakdown state, and the voltage across the zener diode ZD1 hardly changes, so that the voltage of the sampling signal at the sampling end is relatively stable. It should be noted that, in this embodiment, the voltage of the sampled signal is equal to the voltage across the zener diode ZD 1.

In some embodiments of the present invention, as shown in fig. 2, the sampling unit 41 includes a resistor R3 and a resistor R11, one end of the resistor R3 is connected to the input end of the voltage regulating module 2, the other end of the resistor R3 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to ground, the other end of the resistor R11 is connected to ground, and the sampling end is disposed between the other end of the resistor R3 and one end of the resistor R11.

Specifically, when the driving power supply starts to operate, the resistor R3 and the resistor R11 divide the voltage at the input end of the voltage regulation module 2, and the voltage of the resistor R11 changes as the voltage at the input end of the voltage regulation module 2 changes. It should be noted that, in this embodiment, the voltage level of the sampled signal is equal to the voltage level across the resistor R11. It can be understood that, in this embodiment, after the driving module 1 is started, even if the voltage across the resistor R11 changes, the switch Q3 is always turned off or the comparator always outputs a low level signal.

In some embodiments of the present invention, as shown in fig. 1 and fig. 2, the switch module 4 further includes a diode D1, an anode of the diode D1 is connected to the input end of the voltage regulating module 2, and a cathode of the diode D1 is connected to the sampling unit 41 and the output end of the switch tube Q3, respectively.

Specifically, when the external power source connected to the diode D1 is an ac power source such as the commercial power, the diode D1 can perform a rectification function, and the sampling unit 41 and the switching tube Q3 can work normally.

In some embodiments of the present invention, as shown in fig. 1 and fig. 2, the switch module 4 further includes a diode D2, an anode of the diode D2 is connected to one end of the switch tube Q3, and a cathode of the diode D2 is connected to the power supply terminals of the power taking module 3 and the driving module 1, respectively.

Specifically, due to the unidirectional conductivity of the diode, the diode D2 enables current to flow only from the input terminal of the switch Q3 to the power supply terminal of the driving module 1, but not from the power module 3 to the input terminal of the switch Q3, which can avoid the adverse effect on the switch Q3 caused by the current flowing to the driving module 1 when the power module 3 operates.

In some embodiments of the present invention, as shown in fig. 1 and fig. 2, the switch module 4 further includes a capacitor CE2, and one end of the capacitor CE2 is connected to the cathode of the diode D2, the power supply module 3 and the power supply terminal of the driving module 1 respectively.

In this embodiment, when the driving power supply is just started, the switching module 4 is switched to the conducting state, the external power supply sequentially passes through the switching tube Q3 and the diode D2 to charge the capacitor CE2, and when the voltage across the capacitor CE2 reaches a certain level, the driving module 1 will start to operate.

In some embodiments of the present invention, as shown in fig. 1 and fig. 2, the driving module 1 includes a control chip U1 and a switch tube Q2, the power supply terminal of the control chip U1 is connected to the switch module 4 and the power supply module 3, the output terminal of the control chip U1 is connected to the controlled terminal of the switch tube Q2, the input terminal of the switch tube Q2 is connected to the ground, and the output terminal of the switch tube Q2 is connected to the voltage regulation module 2.

Specifically, when the control chip U1 is just started, the external power supply supplies power through the switch module 4, and then the power supply module 3 supplies power. After the power supply terminal of the control chip U1 is powered on, the output terminal can output a signal (e.g., a PWM signal), and the switching tube Q2 can switch between an on state and an off state according to the signal, thereby controlling and changing the operating state of the voltage regulating unit 21. The switching tube Q2 may be a MOS tube or an IGBT tube.

In some embodiments, the power-taking module 3 is further connected to the voltage sampling terminal FB of the control chip U1.

In some embodiments of the present invention, as shown in fig. 1 and fig. 2, a diode D3 is provided between the power supply terminal of the control chip U1 and the power taking module 3, the anode of the diode D3 is connected to the power taking module 3, and the cathode of the diode D3 is connected to the power supply terminal of the control chip U1.

Specifically, due to the unidirectional conductivity of the diode, the diode D3 enables current to flow only from the power supply terminal of the control chip U1 to the power supply terminal of the power module 3, but not from the power supply terminal of the control chip U1 to the power module 3, which can avoid the adverse effect of the current flowing to the power supply terminal of the control chip U1 through the switch module 4 on the power module 3.

The utility model discloses an in some embodiments, as shown in fig. 1, fig. 2, voltage regulating module 2 includes voltage regulating unit 21 and rectifier unit 22, rectifier unit 22's input is connected with switch module 4, rectifier unit 22's input is used for being connected with external power source, rectifier unit 22's output and drive module 1's output are connected with voltage regulating unit 21's input, voltage regulating unit 21's output with get electric module 3 and be connected, voltage regulating unit 21's output is used for being connected with the load.

Specifically, in some embodiments, the voltage regulating unit 21 is a transformer, the transformer includes a first winding and a second winding coupled to each other, one end of the first winding is used for being electrically connected to an external power source, the other end of the first winding is connected to the output terminal of the driving module 1, the second winding is used for being connected to a load, and the power taking module 3 may be a third winding coupled to the first winding and connected to the power supply terminal of the driving module 1.

In other embodiments, the power-taking module 3 may also be a part of the second winding. It should be noted that the turns ratio of the first winding to the second winding can be set according to actual conditions.

Also, the rectifying unit 22 may employ a functional module or a functional element commonly known in the art, for example, the rectifying unit 22 may employ a rectifying bridge. In some embodiments, an absorption unit may be further disposed between the output terminal of the rectifying unit 22 and the input terminal of the voltage regulating unit 21, and the absorption unit may employ an RC absorption circuit.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A drive power supply, comprising:

a drive module (1);

the input end of the voltage regulating module (2) is used for being connected with an external power supply, the output end of the voltage regulating module (2) is used for being connected with a load, and the output end of the driving module (1) is connected with the voltage regulating module (2) so as to control the voltage regulating module (2) to work;

the input end of the power taking module (3) is connected with the output end of the voltage regulating module (2), and the output end of the power taking module (3) is connected with the power supply end of the driving module (1);

switch module (4), the one end of switch module (4) with the input of pressure regulating module (2) is connected, the other end of switch module (4) with the power supply end of drive module (1) is connected and switch module (4) with it connects in order can according to get the output formation trigger signal of electric module (3), switch module (4) can be according to trigger signal switches in the on-state or off-state.

2. A driving power supply according to claim 1, wherein: switch module (4) are including sampling unit (41) and switch tube Q3, sampling unit (41) are provided with the sample end, sampling unit (41) with the input of voltage regulating module (2) is connected, switch tube Q3's input with the feeder ear of drive module (1) and it connects and to get electric module (3) switch tube Q3 basis it is in to get the output of electric module (3) the input of switch tube Q3 forms triggering signal, switch tube Q3's controlled end with the sample end is connected with switch tube Q3's controlled end forms sampling signal, switch tube Q3's output with the input of voltage regulating module (2) is connected, switch tube Q3 can be based on triggering signal and sampling signal switches in on-state or off state.

3. A driving power supply according to claim 1, wherein: switch module (4) are including sampling unit (41) and comparator, sampling unit (41) are provided with the sampling end, sampling unit (41) with the input of pressure regulating module (2) is connected, the positive input of comparator with the sampling end is connected with the positive input end of comparator forms sampling signal, the negative pole input of comparator with it connects with to get electric module (3) the negative pole input end of comparator forms trigger signal, the output of comparator with the feed end of drive module (1) is connected, the comparator can be according to trigger signal and sampling signal output high level signal or low level signal.

4. A driving power supply according to claim 2 or 3, wherein: the sampling unit (41) comprises a resistor R3 and a voltage stabilizing diode ZD1, one end of the resistor R3 is connected with the input end of the voltage regulating module (2), the other end of the resistor R3 is connected with the cathode of the voltage stabilizing diode ZD1, the anode of the voltage stabilizing diode ZD1 is connected with the ground, and the sampling end is arranged between the other end of the resistor R3 and the cathode of the voltage stabilizing diode ZD 1.

5. A driving power supply according to claim 2 or 3, wherein: the sampling unit (41) comprises a resistor R3 and a resistor R11, one end of the resistor R3 is connected with the input end of the voltage regulating module (2), the other end of the resistor R3 is connected with one end of the resistor R11, the other end of the resistor R11 is connected with the ground, and the sampling end is arranged between the other end of the resistor R3 and one end of the resistor R11.

6. A driving power supply according to claim 2, wherein: the switch module (4) further comprises a diode D1, the anode of the diode D1 is connected with the input end of the voltage regulating module (2), and the cathode of the diode D1 is connected with the sampling unit (41) and the output end of the switch tube Q3 respectively.

7. A driving power supply according to claim 1, wherein: drive module (1) includes control chip U1 and switch tube Q2, control chip U1 the feed end respectively with switch module (4) and get electric module (3) and connect, control chip U1's output with switch tube Q2's controlled end is connected, switch tube Q2's input is connected with ground, switch tube Q2's output with voltage regulating module (2) are connected.

8. A driving power supply according to claim 7, wherein: the power supply end of the control chip U1 and be provided with diode D3 between getting electric module (3), diode D3 the positive pole with it connects to get electric module (3), diode D3's negative pole with the power supply end of control chip U1 is connected.

9. A driving power supply according to claim 1, wherein: the voltage regulating module (2) comprises a voltage regulating unit (21) and a rectifying unit (22), the input end of the rectifying unit (22) is connected with the switch module (4), the input end of the rectifying unit (22) is used for being connected with an external power supply, the output end of the rectifying unit (22) and the output end of the driving module (1) are connected with the input end of the voltage regulating unit (21), the output end of the voltage regulating unit (21) is connected with the power taking module (3), and the output end of the voltage regulating unit (21) is used for being connected with a load.