Low-voltage auxiliary power supply device of servo driver

Abstract

The utility model relates to a low-voltage auxiliary power supply device of a servo driver, and the device comprises a substrate which comprises a first surface and a second surface which are opposite to each other; the flyback circuit comprises a planar transformer and a flyback control circuit which are arranged on the substrate, the flyback control circuit comprises a first flyback control circuit and a second flyback control circuit, the first flyback control circuit is arranged on the first surface, and the second flyback control circuit is arranged on the second surface; the flyback circuit is used for inputting power supply low voltage and outputting driving voltage and control voltage; the driving voltage output circuit is arranged on the second surface, and the driving voltage output circuit is electrically connected with the second flyback control circuit; the control voltage output circuit is arranged on the first surface, and the control voltage output circuit is electrically connected with the first flyback control circuit; and the through hole is formed in the substrate, and the low-voltage auxiliary power supply device is connected with the servo driver through the through hole. The low-voltage auxiliary power supply device is small in size and can be adapted to different servo drivers.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of industrial automation, and in particular to a low-voltage auxiliary power supply device for a servo drive. Background Art

[0002] In modern industrial automation, servo drives, also known as "servo controllers" or "servo amplifiers," serve as core components of motion control. They are widely used in a variety of high-end automation equipment, including industrial robots and semiconductor manufacturing equipment. With technological advancements and the increasing sophistication of industrial production, the demand for smaller and more precise processing is growing, placing new demands on the miniaturization of servo drives.

[0003] Current AC servo drives are suitable for supply voltages ranging from AC220V to AC380V. These drives are relatively large, requiring considerable space and presenting challenges such as inconvenience in installation, commissioning, and transportation. The core issue with the servo drive's large size lies in the size of the auxiliary power supply module, which typically exceeds 8.9 cubic centimeters. The conventional transformer used in the auxiliary power supply module is large, and the integration of the transformer, control circuit, and other components is low, preventing optimal utilization of the auxiliary power supply module's space.

[0004] For servo drives that require low-voltage input power, the existing auxiliary power supply modules are large in size, which limits the miniaturization of the servo drives. Utility Model Content

[0005] The technical problem to be solved by this application is to provide a low-voltage auxiliary power supply device for a servo drive, which improves the integration of power supply designs such as transformers and control circuits on circuit boards. The low-voltage auxiliary power supply device is small in size and can be adapted to different servo drives, thereby promoting the miniaturization design of the servo drive.

[0006] The technical solution adopted by the present application to solve the above-mentioned technical problems is a low-voltage auxiliary power supply device for a servo drive, comprising: a substrate, comprising a first surface and a second surface relative to each other; a flyback circuit, comprising a planar transformer and a flyback control circuit, the planar transformer being arranged on the substrate, the flyback control circuit comprising a first flyback control circuit and a second flyback control circuit, the first flyback control circuit being arranged on the first surface, and the second flyback control circuit being arranged on the second surface; the flyback circuit is used to input a low voltage power supply and output a driving voltage and a control voltage; a driving voltage output circuit being arranged on the second surface, the driving voltage output circuit being electrically connected to the second flyback control circuit; a control voltage output circuit being arranged on the first surface, the control voltage output circuit being electrically connected to the first flyback control circuit; a through hole being arranged on the substrate, the low-voltage auxiliary power supply device being connected to the servo drive via the through hole.

[0007] In one embodiment of the present application, the planar transformer includes a first PCB layer, a second PCB layer, and a third PCB layer that are insulated from each other. A first winding coil is provided on the first PCB layer, a second winding coil is provided on the second PCB layer, and a third winding coil is provided on the third PCB layer.

[0008] In one embodiment of the present application, the first flyback control circuit includes a low-voltage power supply input terminal and a control voltage output terminal, the low-voltage power supply input terminal is electrically connected to the first winding coil, the control voltage output terminal is electrically connected to the third winding coil, and the control voltage output terminal is connected to the low-voltage ground.

[0009] In one embodiment of the present application, the second flyback control circuit includes a low-voltage power input terminal and a driving voltage output terminal, the low-voltage power input terminal is electrically connected to the first winding coil, the driving voltage output terminal is electrically connected to the second winding coil, and the driving voltage output terminal is connected to the high-voltage ground.

[0010] In one embodiment of the present application, the planar transformer also includes a magnetic core and a semi-enclosed shell. Magnetic core mounting holes are provided on the first PCB layer, the second PCB layer, and the third PCB layer. The magnetic core passes through the magnetic core mounting holes and the two ends of the magnetic core protrude outward from the first surface and the second surface respectively; the shell is used to protect the magnetic core.

[0011] In one embodiment of the present application, the low-voltage auxiliary power supply device further includes a first diode, which is disposed on the first surface and / or the second surface and located around the planar transformer. The first diode is used to absorb voltage spikes of the planar transformer.

[0012] In one embodiment of the present application, the low-voltage auxiliary power supply device further includes a second diode, which is disposed on the second surface and located between the planar transformer and the driving voltage output circuit. The second diode is used to rectify the driving voltage output by the planar transformer.

[0013] In one embodiment of the present application, the low-voltage auxiliary power supply device further includes a third diode, which is disposed on the first surface and located between the planar transformer and the control voltage output circuit. The third diode is used to rectify the control voltage output by the planar transformer.

[0014] In one embodiment of the present application, the low-voltage auxiliary power supply device also includes a capacitor and / or an inductor, which is arranged on the first surface and located between the third diode and the control voltage output circuit. The capacitor and / or the inductor is used to store energy of the control voltage after rectification by the third diode.

[0015] In one embodiment of the present application, the volume of the low-voltage auxiliary power supply device is less than or equal to 1.5 cubic centimeters.

[0016] The technical solution of the present application modularizes the power supply design on the circuit board, improves the integration of the power supply, and enables the low-voltage auxiliary power supply device to be reused in different servo drives. The present application reduces electromagnetic interference between the circuit modules by respectively arranging the first flyback control circuit, the second flyback control circuit, the drive voltage output circuit, and the control voltage output circuit on different surfaces of the substrate, thereby ensuring the stable output of the control voltage and the drive voltage, and improving the control accuracy of the servo drive; the through holes on the substrate facilitate welding or plug-in connection of the low-voltage auxiliary power supply device to the servo drive, which can meet the needs of different application scenarios and increase the versatility of the low-voltage auxiliary power supply device.

[0017] This application is equivalent to the design of a miniaturized low-voltage auxiliary power supply module for an AC servo drive. This application improves the integration of power supply designs such as planar transformers and control circuits on circuit boards. The low-voltage auxiliary power supply device is small in size, less than 1.5 cubic centimeters, and can save 83% of the assembly space. It can be adapted to different servo drives, thereby promoting the miniaturization design of the servo drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the above-mentioned objects, features and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 1 is a schematic diagram from a top view of a low-voltage auxiliary power supply device of a servo drive according to an embodiment of the present application;

[0020] Figure 2 This is a bottom-up schematic diagram of a low-voltage auxiliary power supply device for a servo drive according to an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of a flyback circuit in one embodiment of the present application;

[0022] Figure 4Schematic diagram of a planar transformer in one embodiment of the present application.

[0023] Description of the accompanying drawings in the specific embodiment:

[0024] 100. Low-voltage auxiliary power supply device; 110. Substrate; 111. First surface; 112. Second surface; 120. Planar transformer; 121. First PCB layer; 1211. First winding coil; 122. Second PCB layer; 1221. Second winding coil; 123. Third PCB layer; 1231. Third winding coil; 124. Magnetic core; 125. Magnetic core mounting hole; 126. Housing; 131. First flyback control circuit; 1311. Low-voltage power input terminal; 1312. Drive voltage output terminal; 132. Second flyback control circuit; 1321. Control voltage output terminal; 140. Drive voltage output circuit; 150. Control voltage output circuit; 160. Through hole; 171. First diode; 172. Second diode; 173. Third diode; 180. Capacitor; 181. Inductor; 190. Insulation layer. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objectives, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0027] As used in this application and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not intended to refer to the singular but may include the plural. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements.

[0028] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0029] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is solely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. Furthermore, while the terms used in this application are selected from commonly known and commonly used terms, some terms mentioned in this specification may have been selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant sections of this description. Furthermore, this application should be understood not only by the actual terms used, but also by the meaning implied by each term.

[0031] Hereinafter, embodiments of the present application will be described based on the accompanying drawings. However, the embodiments shown below are examples of low-voltage auxiliary power supply devices for servo drives that embody the technical ideas of the present application, and the low-voltage auxiliary power supply devices for servo drives of the present application are not specifically the following contents. Furthermore, in order to facilitate the understanding of the scope of the claims, this specification assigns numbers corresponding to the components shown in the embodiments to the components shown in the "Claims" and "Application Contents" columns. However, the components shown in the claims are by no means specific to the components of the embodiments. In particular, the dimensions, materials, shapes, and relative configurations of the constituent components described in the embodiments, if not specifically described, are not intended to limit the scope of the present application to these only, but are merely illustrative examples.

[0032] However, the dimensions or positional relationships of the components shown in the drawings are sometimes exaggerated for the purpose of clarifying the description. Furthermore, in the following description, for components that are identical or homogeneous, the same name or symbol indicates that its detailed description will be omitted as appropriate. Furthermore, the various elements constituting the present application may be in the form of multiple elements being constituted by the same component so that one component serves as multiple elements, or conversely, multiple components sharing the function of one component. In addition, the contents described in some embodiments and implementation methods may also be utilized in other embodiments, implementation methods, etc. In addition, in this specification, "on" is not limited to the case where it is formed in contact with the upper surface, but also includes the case where it is formed separately above, and is also used to include the meaning of the presence of an intervening layer between layers.

[0033] The present application proposes a low-voltage auxiliary power supply device for a servo drive, which can be applied to servo drives that require a low-voltage input power supply and have miniaturized design requirements.

[0034] Figure 1 1 is a schematic diagram from a top view of a low-voltage auxiliary power supply device for a servo drive according to an embodiment of the present application. Figure 2 Schematic diagram of a low-voltage auxiliary power supply device for a servo drive according to an embodiment of the present invention from a bottom perspective. Figure 1 and Figure 2 As shown, the low-voltage auxiliary power supply device 100 of the servo drive of this embodiment includes: a substrate 110, including a first surface 111 and a second surface 112 relative to each other; a flyback circuit, including a planar transformer 120 and a flyback control circuit, the planar transformer 120 is arranged on the substrate 110, and the flyback control circuit includes a first flyback control circuit 131 and a second flyback control circuit 132, the first flyback control circuit 131 is arranged on the first surface 111, and the second flyback control circuit 132 is arranged on the second surface 112; the flyback circuit is used to input a low power supply voltage and output a driving voltage and a control voltage.

[0035] Continue to refer Figure 1 and Figure 2 As shown, the low-voltage auxiliary power supply device 100 further includes a drive voltage output circuit 140 disposed on the second surface 112 and electrically connected to the second flyback control circuit 132; a control voltage output circuit 150 disposed on the first surface 111 and electrically connected to the first flyback control circuit 131; and a through hole 160 disposed on the substrate 110, through which the low-voltage auxiliary power supply device 100 is connected to a servo driver (not shown). In some embodiments, the volume of the low-voltage auxiliary power supply device 100 is less than or equal to 1.5 cubic centimeters.

[0036] For example, the low voltage of the power supply input to the flyback circuit can be less than or equal to 100V (volts). The low-voltage auxiliary power supply device 100 can be welded and fixed in the servo drive through the through-hole 160. The substrate 110 can be a PCB (Printed Circuit Board) board, and the through-holes 160 on the substrate 110 can be set to multiple, and the multiple through-holes 160 can be distributed on one side of the substrate 110 or irregularly distributed. The present application does not limit the number and distribution of the through-holes 160. Capacitors 180, resistors (not shown) and other components can be arranged around the driving voltage output circuit 140 and the control voltage output circuit 150. Such an arrangement can enable the low-voltage auxiliary power supply device 100 to have the functions of filtering, voltage stabilization, energy storage, current limiting, voltage division, and protection circuit, thereby improving the control accuracy of the servo drive.

[0037] The technical solution of the present application modularizes the power supply design on the circuit board, improves the integration of the power supply, and enables the low-voltage auxiliary power supply device 100 to be reused in different servo drives. The present application reduces electromagnetic interference between the circuit modules by respectively arranging the first flyback control circuit 131, the second flyback control circuit 132, the drive voltage output circuit 140, and the control voltage output circuit 150 on different surfaces of the substrate 110, thereby ensuring the stable output of the control voltage and the drive voltage, and improving the control accuracy of the servo drive; the through hole 160 on the substrate 110 facilitates welding or plug-in connection of the low-voltage auxiliary power supply device 100 to the servo drive, which can meet the needs of different application scenarios and increase the versatility of the low-voltage auxiliary power supply device 100.

[0038] This application is equivalent to the design of a miniaturized low-voltage auxiliary power supply module for an AC servo drive. This application improves the integration of power supply designs such as the planar transformer 120 and the control circuit on the circuit board. The low-voltage auxiliary power supply device 100 is relatively small in size, with a volume of less than 1.5 cubic centimeters, which can save 83% of the assembly space and can be adapted to different servo drives, thereby promoting the miniaturized design of the servo drive.

[0039] Figure 4 Schematic diagram of a planar transformer in one embodiment of the present application. Figure 4As shown, in some embodiments, the planar transformer 120 includes a first PCB layer 121, a second PCB layer 122, and a third PCB layer 123, which are insulated from each other. A first winding coil 1211 is provided on the first PCB layer 121, a second winding coil 1221 is provided on the second PCB layer 122, and a third winding coil 1231 is provided on the third PCB layer 123. For example, the PCB layers can be insulated from each other by an insulating layer 190. This layered layout design of the present application can prevent electromagnetic interference and short circuit risks between the winding coils, optimize space utilization, and make the entire transformer structure more compact and lightweight.

[0040] Figure 3 Schematic diagram of a flyback circuit in one embodiment of the present application. Figures 1 to 3 As shown, in some embodiments, the first flyback control circuit 131 includes a low-voltage power supply input terminal 1311 and a control voltage output terminal 1321. The low-voltage power supply input terminal 1311 is electrically connected to the first winding coil 1211, and the control voltage output terminal 1321 is electrically connected to the third winding coil 1231. The control voltage output terminal 1321 is connected to a low-voltage ground. For example, the low-voltage power supply input to the low-voltage power supply input terminal 1311 can be less than or equal to 100V, for example, can be set to DC0V to DC100V, and further can be DC12V to DC60V.

[0041] In some embodiments, the second flyback control circuit 132 includes a power supply low voltage input terminal 1311 and a driving voltage output terminal 1312. The power supply low voltage input terminal 1311 is electrically connected to the first winding coil 1211, and the driving voltage output terminal 1312 is electrically connected to the second winding coil 1221. The driving voltage output terminal 1312 is connected to the high voltage ground. Figure 3 In the illustrated embodiment, the first flyback control circuit 131 and the second flyback control circuit 132 can be considered to share a single low-voltage power supply input terminal 1311. In other embodiments, two low-voltage power supply input terminals can be provided, such that the first flyback control circuit 131 corresponds to one of the low-voltage power supply input terminals, and the second flyback control circuit 132 corresponds to the other low-voltage power supply input terminal. This application does not impose any restrictions on the number of low-voltage power supply input terminals 1311.

[0042] In practical applications, a resistor can be placed near the drive voltage output circuit 140 as a dummy load to stabilize the drive voltage. This application utilizes the first and second flyback control circuits 131 and 132 in conjunction with the multi-winding design of the planar transformer 120 to achieve an efficient, isolated, and compact flyback circuit design. This prevents electrical interference between different voltages and improves the overall performance of the servo drive.

[0043] refer to Figure 1 and Figure 4 As shown, in some embodiments, the planar transformer 120 further includes a magnetic core 124 and a semi-enclosed housing 126. A magnetic core mounting hole 125 is provided on each of the first PCB layer 121, the second PCB layer 122, and the third PCB layer 123. The magnetic core 124 extends through the magnetic core mounting hole 125, and its two ends protrude outward from the first surface 111 and the second surface 112, respectively. The housing 126 is used to protect the magnetic core 124. For example, by designing the magnetic core 124 of the planar transformer 120 with its two ends protruding outward from the surface of the substrate 110, the present application effectively utilizes three-dimensional space and facilitates heat dissipation. This allows the entire low-voltage auxiliary power supply device 100 to maintain its functional integrity while saving space on the substrate 110 and achieving a compact size. This application can enhance the magnetic coupling efficiency of the planar transformer 120 and facilitate heat dissipation. The protection of the housing 126 effectively isolates the magnetic core 124 from the external environment, thereby improving the stability of the planar transformer 120 and the reliability of the servo drive.

[0044] refer to Figure 2 As shown, in some embodiments, the low-voltage auxiliary power supply device 100 further includes a first diode 171. The first diode 171 can be disposed on the first surface 111 and / or the second surface 112 and located around the planar transformer 120. The first diode 171 is configured to absorb voltage spikes from the planar transformer 120. By way of example, this configuration can enhance circuit stability and reliability, reduce the risk of component damage due to voltage spikes, and thereby extend the service life of the low-voltage auxiliary power supply device 100.

[0045] Continue to refer Figure 2 As shown, in some embodiments, the low-voltage auxiliary power supply device 100 further includes a second diode 172, which is disposed on the second surface 112 and between the planar transformer 120 and the drive voltage output circuit 140. The second diode 172 is used to rectify the drive voltage output by the planar transformer 120. By way of example, this configuration can reduce voltage fluctuations and harmonic interference, thereby ensuring the stability of the drive voltage.

[0046] For example, the circuit component mentioned in this application is located between two other circuit components. “Located” can mean the location shown in the drawings or the connection between the components through circuits. Figure 2 It can be seen that the second diode 172 is located between the planar transformer 120 and the driving voltage output circuit 140. In actual applications, the second diode 172 can be located near the planar transformer 120 and the driving voltage output circuit 140, as long as the second diode 172 and the planar transformer 120 and the driving voltage output circuit 140 are electrically connected.

[0047] refer to Figure 1 As shown, in some embodiments, the low-voltage auxiliary power supply device 100 further includes a third diode 173. The third diode 173 is disposed on the first surface 111 and is located between the planar transformer 120 and the control voltage output circuit 150. The third diode 173 is used to rectify the control voltage output by the planar transformer 120. By way of example, this configuration can reduce voltage fluctuations and noise, ensure the stability of the control voltage, and thereby improve the response speed and accuracy of the servo drive.

[0048] In some embodiments, the low-voltage auxiliary power supply device 100 further includes a capacitor 180 and / or an inductor 181, which is disposed on the first surface 111 and between the third diode 173 and the control voltage output circuit 150. The capacitor 180 and / or the inductor 181 is used to store energy in the control voltage rectified by the third diode 173. For example, this configuration of the present application can smooth fluctuations in the control voltage, ensuring that the control voltage can be quickly and stably supplied to the control voltage output circuit 150 when needed, thereby improving the overall performance and dynamic response speed of the servo drive.

[0049] Although the above disclosure discusses some currently believed useful utility model embodiments through various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the spirit and scope of the embodiments of the application. For example, although the system components described above can be implemented using hardware devices, they can also be implemented using software solutions, such as installing the described system on an existing server or mobile device.

[0050] Similarly, it should be noted that, in order to simplify the description of the present disclosure and thus facilitate understanding of one or more utility model embodiments, the foregoing description of the present embodiment sometimes combines multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of the present application requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than the total features of a single embodiment disclosed above.

[0051] In some embodiments, numbers are used to describe the quantity of components and attributes. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the description and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the settings of such numerical values ​​are as accurate as possible within the feasible range.

[0052] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions can be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A low-voltage auxiliary power supply device for a servo drive, characterized in that: include: a substrate comprising opposing first and second surfaces; A flyback circuit, comprising a planar transformer and a flyback control circuit, wherein the planar transformer is disposed on the substrate, and the flyback control circuit comprises a first flyback control circuit and a second flyback control circuit, wherein the first flyback control circuit is disposed on the first surface, and the second flyback control circuit is disposed on the second surface; the flyback circuit is configured to input a low power supply voltage and output a drive voltage and a control voltage; a driving voltage output circuit, disposed on the second surface, the driving voltage output circuit being electrically connected to the second flyback control circuit; a control voltage output circuit, disposed on the first surface, the control voltage output circuit being electrically connected to the first flyback control circuit; A through hole is provided on the substrate, and the low-voltage auxiliary power supply device is connected to the servo driver through the through hole.

2. The low-voltage auxiliary power supply device according to claim 1, characterized in that: The planar transformer includes a first PCB layer, a second PCB layer, and a third PCB layer that are insulated from each other. A first winding coil is provided on the first PCB layer, a second winding coil is provided on the second PCB layer, and a third winding coil is provided on the third PCB layer.

3. The low-voltage auxiliary power supply device according to claim 2, characterized in that: The first flyback control circuit includes a power low-voltage input terminal and a control voltage output terminal, the power low-voltage input terminal is electrically connected to the first winding coil, the control voltage output terminal is electrically connected to the third winding coil, and the control voltage output terminal is connected to a low-voltage ground.

4. The low-voltage auxiliary power supply device according to claim 2, characterized in that: The second flyback control circuit includes a low-voltage power input terminal and a driving voltage output terminal, the low-voltage power input terminal is electrically connected to the first winding coil, the driving voltage output terminal is electrically connected to the second winding coil, and the driving voltage output terminal is connected to the high-voltage ground.

5. The low-voltage auxiliary power supply device according to claim 2, characterized in that: The planar transformer also includes a magnetic core and a semi-enclosed shell. The first PCB layer, the second PCB layer, and the third PCB layer are all provided with magnetic core mounting holes. The magnetic core passes through the magnetic core mounting holes and the two ends of the magnetic core protrude outward from the first surface and the second surface respectively; the shell is used to protect the magnetic core.

6. The low-voltage auxiliary power supply device according to claim 1, characterized in that: The device further includes a first diode, which is arranged on the first surface and / or the second surface and located around the planar transformer. The first diode is used to absorb voltage spikes of the planar transformer.

7. The low-voltage auxiliary power supply device according to claim 1, characterized in that: It also includes a second diode, which is arranged on the second surface and located between the planar transformer and the driving voltage output circuit. The second diode is used to rectify the driving voltage output by the planar transformer.

8. The low-voltage auxiliary power supply device according to claim 1, characterized in that: It also includes a third diode, which is arranged on the first surface and located between the planar transformer and the control voltage output circuit. The third diode is used to rectify the control voltage output by the planar transformer.

9. The low-voltage auxiliary power supply device according to claim 8, characterized in that: It also includes a capacitor and / or inductor, which is arranged on the first surface and located between the third diode and the control voltage output circuit. The capacitor and / or inductor is used to store energy of the control voltage after rectification by the third diode.

10. The low-voltage auxiliary power supply device according to claim 1, characterized in that: The volume of the low-voltage auxiliary power supply device is less than or equal to 1.5 cubic centimeters.

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