CN218587068U - Voltage conversion device and power supply equipment - Google Patents
Voltage conversion device and power supply equipment Download PDFInfo
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- CN218587068U CN218587068U CN202222599227.5U CN202222599227U CN218587068U CN 218587068 U CN218587068 U CN 218587068U CN 202222599227 U CN202222599227 U CN 202222599227U CN 218587068 U CN218587068 U CN 218587068U
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application provides voltage conversion equipment and power supply unit belongs to power technical field. The voltage conversion device includes: the device comprises a voltage control module, a voltage conversion module and a voltage output module. The voltage control module is used for acquiring an external pulse signal and outputting a voltage control signal according to the external pulse signal; the voltage conversion module is connected with the voltage control module and is used for acquiring a voltage control signal and performing voltage conversion on external power supply voltage according to the voltage control signal so as to output transformation voltage; the voltage conversion module comprises at least one mutual inductor, and the mutual inductor is used for voltage conversion; the voltage output module is connected with the voltage conversion module and is used for stabilizing the voltage of the transformed voltage so as to output a target voltage. The mutual inductor replaces the traditional pulse controller, electronic switch, transformer and other devices to carry out voltage transformation, thereby reducing the number of related devices and simplifying the circuit structure.
Description
Technical Field
The application relates to the technical field of power supplies, in particular to a voltage conversion device and power supply equipment.
Background
In the related art, devices such as a pulse controller, an electronic switch and a transformer are adopted to carry out voltage conversion on a power supply of electronic equipment so as to drive a corresponding circuit module to work, and the power supply circuit constructed in the way is complex in structure.
SUMMERY OF THE UTILITY MODEL
The embodiments of the present application mainly aim to provide a voltage conversion device and a power supply apparatus, which aim to simplify a voltage conversion circuit.
To achieve the above object, a first aspect of an embodiment of the present application proposes a voltage conversion device, including:
the voltage control module is used for acquiring an external pulse signal and outputting a voltage control signal according to the external pulse signal;
the voltage conversion module is connected with the voltage control module and is used for acquiring the voltage control signal and performing voltage conversion on external power supply voltage according to the voltage control signal so as to output transformed voltage; the voltage conversion module comprises at least one mutual inductor, and the mutual inductor is used for performing voltage conversion;
and the voltage output module is connected with the voltage conversion module and is used for stabilizing the voltage of the transformation voltage so as to output a target voltage.
In some embodiments, the power supply further comprises a voltage input module, wherein the voltage input module is connected with the voltage conversion module and is used for stabilizing the external power supply voltage.
In some embodiments, the voltage conversion module comprises a voltage transformer, the voltage transformer comprises a primary winding and a secondary winding, one end of the primary winding is connected to the voltage input module, the other end of the primary winding is connected to the voltage control module, and the secondary winding is connected to the voltage output module.
In some embodiments, the voltage control module comprises a first resistor, a second resistor and a triode;
one end of the first resistor is connected with one end of the second resistor, and the other end of the first resistor is connected with external equipment to obtain an external pulse signal;
the other end of the second resistor is grounded;
the base electrode of the triode is connected with one end of the second resistor, the collector electrode of the triode is connected with the other end of the primary winding, and the emitting electrode of the triode is grounded.
In some embodiments, the voltage input module comprises a third resistor, a fourth resistor, a first capacitor, and a first diode;
one end of the third resistor is connected with one end of the primary winding, and the other end of the third resistor is connected with the cathode of the first diode;
one end of the fourth resistor is connected with one end of the primary winding, and the other end of the fourth resistor is connected with the cathode of the first diode;
one end of the first capacitor is connected with one end of the primary winding, and the other end of the first capacitor is connected with the cathode of the first diode;
and the anode of the first diode is connected with the voltage control module.
In some embodiments, the voltage output module includes a rectifying and filtering unit configured to perform rectifying and filtering processing on the transformed voltage to output an intermediate voltage, and a regulated output unit configured to regulate the intermediate voltage to output the target voltage.
In some embodiments, the rectifying and filtering unit comprises a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, a third capacitor and a second diode;
one end of the fifth resistor is connected with one end of the secondary winding, and the other end of the fifth resistor is connected with the other end of the secondary winding;
the anode of the second diode is connected with one end of the fifth resistor, and the cathode of the second diode is connected with one end of the second capacitor;
the other end of the second capacitor is grounded;
one end of the third capacitor is connected with the cathode of the second diode, and the other end of the third capacitor is grounded;
one end of the sixth resistor is connected with the cathode of the second diode, and the other end of the sixth resistor is grounded;
one end of the seventh resistor is connected with the cathode of the second diode, and the other end of the seventh resistor is grounded.
In some embodiments, the regulated output unit includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor, and a three-terminal regulator, the three-terminal regulator having a cathode, an anode, and a reference electrode;
one end of the eighth resistor is connected with the rectifying and filtering unit, and the other end of the eighth resistor is connected with the cathode of the three-terminal regulator;
one end of the ninth resistor is connected with the rectifying and filtering unit, and the other end of the ninth resistor is connected with the cathode of the three-terminal regulator;
one end of the tenth resistor is connected with the cathode of the three-terminal regulator, and the other end of the tenth resistor is connected with the reference electrode of the three-terminal regulator;
one end of the eleventh resistor is connected with a reference electrode of the three-terminal regulator, and the other end of the eleventh resistor is connected with an anode of the three-terminal regulator;
one end of the fourth capacitor is connected with the cathode of the three-terminal voltage regulator, and the other end of the fourth capacitor is connected with the anode of the three-terminal voltage regulator;
and the anode of the three-terminal voltage stabilizer is grounded.
In order to achieve the above object, a second aspect of the present application proposes a power supply apparatus including the voltage conversion device of the embodiment of the first aspect.
According to the voltage conversion device and the power supply equipment, the mutual inductor replaces the traditional pulse controller, the electronic switch, the transformer and the like to carry out voltage conversion, the number of related devices is reduced, and the circuit structure is simplified.
Drawings
Fig. 1 is a block diagram of a voltage conversion device provided in an embodiment of the present application;
FIG. 2 is a block diagram of a voltage conversion device according to another embodiment of the present application;
fig. 3 is a circuit diagram of a voltage conversion device according to an embodiment of the present application;
fig. 4 is a circuit diagram of a voltage conversion device according to another embodiment of the present application;
reference numerals:
the voltage control module 100, the voltage conversion module 200 and the voltage output module 300;
a rectifying and filtering unit 310, a regulated output unit 320, and a voltage input module 400.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that although the functional modules are divided in the schematic diagram of the apparatus, in some cases, the functional modules may be divided differently from the modules in the apparatus. The terms first, second and the like in the description and in the claims, as well as in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the application.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The voltage conversion device of the embodiment of the application can be applied to a power supply module of electronic equipment. In the related art, devices such as a pulse controller, an electronic switch and a transformer are adopted to carry out voltage conversion on a power supply of electronic equipment so as to drive a corresponding circuit module to work, and the power supply circuit constructed in the way is complex in structure.
Therefore, the voltage conversion device and the power supply equipment are provided, the mutual inductor replaces the traditional pulse controller, the electronic switch, the transformer and other devices to carry out voltage conversion, the number of related devices is reduced, and the circuit structure is simplified.
Referring to fig. 1, a voltage conversion device according to an embodiment of the present application includes: a voltage control module 100, a voltage conversion module 200 and a voltage output module 300. The voltage control module 100 is configured to obtain an external pulse signal and output a voltage control signal according to the external pulse signal; the voltage conversion module 200 is connected to the voltage control module 100, and the voltage conversion module 200 is configured to obtain a voltage control signal and perform voltage conversion on an external power supply voltage according to the voltage control signal to output a transformed voltage; the voltage conversion module 200 includes at least one transformer for performing voltage conversion; the voltage output module 300 is connected to the voltage conversion module 200, and the voltage output module 300 is configured to regulate the transformed voltage to output the target voltage.
In the voltage conversion device according to the embodiment of the present application, the external pulse signal may be a pulse square wave signal with a certain preset width output by the main control chip. The voltage conversion module 200 is connected to an external power source to input an external power supply voltage. After receiving the external pulse signal, the voltage control module 100 outputs a voltage control signal corresponding to the duty ratio according to the external pulse signal, so as to control the magnitude of the output voltage obtained by voltage conversion of the external power supply voltage by the voltage conversion module 200. The voltage transformation voltage output by the voltage transformation module is a pulse voltage, and the voltage output module 300 rectifies and filters the voltage transformation voltage and outputs a direct current target voltage. In the embodiment of the present application, the voltage conversion module 200 adopts a transformer to realize the function of voltage conversion, and the transformer replaces the traditional pulse controller, electronic switch, transformer and other devices to perform voltage conversion, thereby reducing the number of related devices and simplifying the circuit structure.
In some embodiments, referring to fig. 2, the voltage conversion apparatus according to the embodiment of the present application further includes a voltage input module 400, where the voltage input module 400 is connected to the voltage conversion module 200, and the voltage input module 400 is used for stabilizing the external power supply voltage. The voltage input module 400 is connected to an external power supply voltage input terminal of the voltage conversion module 200, and can stabilize an external power supply voltage input by an external power supply, so as to improve the working efficiency of the voltage conversion module 200 in voltage conversion.
In some embodiments, referring to fig. 2 and 3, the voltage transformation module 200 includes a voltage transformer T1, the voltage transformer T1 includes a primary winding and a secondary winding, one end of the primary winding is connected to the voltage input module 400, the other end of the primary winding is connected to the voltage control module 100, and the secondary winding is connected to the voltage output module 300. The voltage transformer T1 operates according to the electromagnetic induction principle, and performs voltage conversion on an external supply voltage according to a voltage control signal to output a transformed voltage. It will be appreciated that the primary winding circuit and the secondary winding circuit of the voltage transformer T1 are independent of each other and do not need to share a common ground.
In some embodiments, referring to fig. 3, the voltage control module 100 includes a first resistor R1, a second resistor R2, and a transistor Q1; one end of the first resistor R1 is connected with one end of the second resistor R2, and the other end of the first resistor R1 is connected with external equipment to obtain an external pulse signal; the other end of the second resistor R2 is grounded; the base electrode of the triode Q1 is connected with one end of the second resistor R2, the collector electrode of the triode Q1 is connected with the other end of the primary winding, and the emitting electrode of the triode Q1 is grounded. The first resistor R1 and the second resistor R2 constitute a voltage dividing circuit. PWM in fig. 3 represents an external pulse signal, which may be a pulse square wave signal with a certain preset width output by the main control chip. An external pulse signal is divided by the first resistor R1 and the second resistor R2 and then applied to the base of the triode Q1, so that the emitter and the collector of the triode Q1 are turned on or off, thereby controlling whether the primary winding of the voltage transformer T1 is connected with the ground wire, and adjusting the pulse width of the transformed voltage output by the voltage transformation module 200. The voltage transformation voltage has different pulse widths, and the voltage output module 300 rectifies and filters the voltage transformation voltage to obtain different target voltages, so that the target voltages can be adjusted by adjusting the preset pulse width of the external pulse signal. In other embodiments, the transistor Q1 may be replaced by a field effect transistor, a gate of the field effect transistor is connected to the common terminal of the first resistor R1 and the second resistor R2, and a source and a drain of the field effect transistor are respectively connected to the ground and the other end of the primary winding of the voltage transformer T1.
In some embodiments, referring to fig. 2 and 3, the voltage input module 400 includes a third resistor R3, a fourth resistor R4, a first capacitor C1 and a first diode D1; one end of the third resistor R3 is connected with one end of the primary winding, and the other end of the third resistor R3 is connected with the cathode of the first diode D1; one end of a fourth resistor R4 is connected with one end of the primary winding, and the other end of the fourth resistor R4 is connected with the cathode of the first diode D1; one end of the first capacitor C1 is connected with one end of the primary winding, and the other end of the first capacitor C1 is connected with the cathode of the first diode D1; the anode of the first diode D1 is connected to the voltage control module 100. VDD in fig. 3 denotes an external power supply voltage input from an external power supply, which is a direct current voltage. The third resistor R3, the fourth resistor R4 and the first capacitor C1 stabilize an external power supply voltage input from an external power supply, so as to improve the working efficiency of the voltage conversion module 200 for voltage conversion. The first diode D1 serves as an isolation.
In some embodiments, referring to fig. 2, the voltage output module 300 includes a rectifying and filtering unit 310 and a voltage-stabilizing output unit 320, wherein the rectifying and filtering unit 310 is configured to perform rectifying and filtering processing on the transformed voltage to output an intermediate voltage, and the voltage-stabilizing output unit 320 is configured to perform voltage stabilization on the intermediate voltage to output a target voltage.
In some embodiments, referring to fig. 2, fig. 3 and fig. 4, the rectifying and filtering unit 310 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2, a third capacitor C3 and a second diode D2; one end of the fifth resistor R5 is connected with one end of the secondary winding, and the other end of the fifth resistor R5 is connected with the other end of the secondary winding; the anode of the second diode D2 is connected to one end of the fifth resistor R5, and the cathode of the second diode D2 is connected to one end of the second capacitor C2; the other end of the second capacitor C2 is grounded; one end of the third capacitor C3 is connected to the cathode of the second diode D2, and the other end of the third capacitor C3 is grounded; one end of the sixth resistor R6 is connected with the cathode of the second diode D2, and the other end of the sixth resistor R6 is grounded; one end of the seventh resistor R7 is connected to the cathode of the second diode D2, and the other end of the seventh resistor R7 is grounded. In this embodiment, the transformation voltage output by the voltage transformer T1 is rectified by the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the second diode D2; and filtering the transformation voltage output by the voltage transformer T1 through a second capacitor C2 and a third capacitor C3 to obtain direct-current intermediate voltage.
In some embodiments, referring to fig. 2, fig. 3 and fig. 4, the regulated output unit 320 includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a fourth capacitor C4 and a three-terminal regulator U1, where the three-terminal regulator U1 is provided with a cathode, an anode and a reference electrode; one end of the eighth resistor R8 is connected with the rectifying and filtering unit 310, and the other end of the eighth resistor R8 is connected with the cathode of the three-terminal regulator U1; one end of the ninth resistor R9 is connected with the rectifying and filtering unit 310, and the other end of the ninth resistor R9 is connected with the cathode of the three-terminal regulator U1; one end of a tenth resistor R10 is connected with the cathode of the three-terminal regulator U1, and the other end of the tenth resistor R10 is connected with the reference electrode of the three-terminal regulator U1; one end of an eleventh resistor R11 is connected with a reference electrode of the three-terminal regulator U1, and the other end of the eleventh resistor R11 is connected with an anode of the three-terminal regulator U1; one end of a fourth capacitor C4 is connected with the cathode of the three-terminal regulator U1, and the other end of the fourth capacitor C4 is connected with the anode of the three-terminal regulator U1; the anode of the three-terminal regulator U1 is grounded. VOUT in fig. 4 represents the target voltage. The eighth resistor R8 and the ninth resistor R9 are used for reducing the intermediate voltage, and the tenth resistor R10 and the eleventh resistor R11 are used for dividing the reduced intermediate voltage to control the reference voltage of the three-terminal regulator U1. The three-terminal regulator U1 compares the voltage value of the reference terminal with a preset reference voltage value to control the conduction degree between the anode and the cathode thereof, thereby stabilizing the output target voltage. The fourth capacitor C4 is used for filtering the target voltage.
To achieve the above object, a second aspect of the present application proposes a power supply apparatus including the voltage conversion device of any of the above embodiments. The mutual inductor replaces the traditional pulse controller, electronic switch, transformer and other devices to carry out voltage conversion, thereby reducing the number of related devices and simplifying the circuit structure.
The embodiments described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation to the technical solutions provided in the embodiments of the present application, and it is obvious to those skilled in the art that the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems with the evolution of technology and the emergence of new application scenarios.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
One of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.
It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" is used to describe the association relationship of the associated object, indicating that there may be three relationships, for example, "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Claims (9)
1. A voltage conversion device, characterized by comprising:
the voltage control module is used for acquiring an external pulse signal and outputting a voltage control signal according to the external pulse signal;
the voltage conversion module is connected with the voltage control module and is used for acquiring the voltage control signal and performing voltage conversion on external power supply voltage according to the voltage control signal so as to output transformed voltage; the voltage conversion module comprises at least one mutual inductor, and the mutual inductor is used for performing voltage conversion;
and the voltage output module is connected with the voltage conversion module and is used for stabilizing the voltage of the transformed voltage so as to output a target voltage.
2. The voltage conversion device according to claim 1, further comprising a voltage input module, wherein the voltage input module is connected to the voltage conversion module, and the voltage input module is configured to stabilize an external supply voltage.
3. The voltage conversion device of claim 2, wherein the voltage conversion module comprises a voltage transformer, the voltage transformer comprises a primary winding and a secondary winding, one end of the primary winding is connected to the voltage input module, the other end of the primary winding is connected to the voltage control module, and the secondary winding is connected to the voltage output module.
4. A voltage conversion arrangement as claimed in claim 3, wherein said voltage control module comprises a first resistor, a second resistor and a transistor;
one end of the first resistor is connected with one end of the second resistor, and the other end of the first resistor is connected with external equipment to obtain an external pulse signal;
the other end of the second resistor is grounded;
the base electrode of the triode is connected with one end of the second resistor, the collector electrode of the triode is connected with the other end of the primary winding, and the emitting electrode of the triode is grounded.
5. A voltage conversion arrangement as claimed in claim 3, characterized in that said voltage input module comprises a third resistor, a fourth resistor, a first capacitor and a first diode;
one end of the third resistor is connected with one end of the primary winding, and the other end of the third resistor is connected with the cathode of the first diode;
one end of the fourth resistor is connected with one end of the primary winding, and the other end of the fourth resistor is connected with the cathode of the first diode;
one end of the first capacitor is connected with one end of the primary winding, and the other end of the first capacitor is connected with the cathode of the first diode;
and the anode of the first diode is connected with the voltage control module.
6. The voltage conversion apparatus according to any one of claims 3 to 5, wherein the voltage output module comprises a rectifying and filtering unit configured to perform rectifying and filtering processing on the transformed voltage to output an intermediate voltage, and a regulated output unit configured to regulate the intermediate voltage to output the target voltage.
7. The voltage conversion device according to claim 6, wherein the rectifying and filtering unit comprises a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, a third capacitor and a second diode;
one end of the fifth resistor is connected with one end of the secondary winding, and the other end of the fifth resistor is connected with the other end of the secondary winding;
the anode of the second diode is connected with one end of the fifth resistor, and the cathode of the second diode is connected with one end of the second capacitor;
the other end of the second capacitor is grounded;
one end of the third capacitor is connected with the cathode of the second diode, and the other end of the third capacitor is grounded;
one end of the sixth resistor is connected with the cathode of the second diode, and the other end of the sixth resistor is grounded;
one end of the seventh resistor is connected with the cathode of the second diode, and the other end of the seventh resistor is grounded.
8. The voltage conversion device according to claim 6, wherein the regulated output unit comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor and a three terminal regulator, the three terminal regulator is provided with a cathode, an anode and a reference electrode;
one end of the eighth resistor is connected with the rectifying and filtering unit, and the other end of the eighth resistor is connected with the cathode of the three-terminal regulator;
one end of the ninth resistor is connected with the rectifying and filtering unit, and the other end of the ninth resistor is connected with the cathode of the three-terminal regulator;
one end of the tenth resistor is connected with the cathode of the three-terminal regulator, and the other end of the tenth resistor is connected with the reference electrode of the three-terminal regulator;
one end of the eleventh resistor is connected with a reference electrode of the three-terminal regulator, and the other end of the eleventh resistor is connected with an anode of the three-terminal regulator;
one end of the fourth capacitor is connected with the cathode of the three-terminal voltage regulator, and the other end of the fourth capacitor is connected with the anode of the three-terminal voltage regulator;
and the anode of the three-terminal regulator is grounded.
9. Power supply equipment, characterized in that it comprises a voltage conversion device according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222599227.5U CN218587068U (en) | 2022-09-29 | 2022-09-29 | Voltage conversion device and power supply equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222599227.5U CN218587068U (en) | 2022-09-29 | 2022-09-29 | Voltage conversion device and power supply equipment |
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| CN218587068U true CN218587068U (en) | 2023-03-07 |
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| CN202222599227.5U Active CN218587068U (en) | 2022-09-29 | 2022-09-29 | Voltage conversion device and power supply equipment |
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