CN219760867U - 0-500V adjustable precision DC-DC converter - Google Patents
0-500V adjustable precision DC-DC converter Download PDFInfo
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- CN219760867U CN219760867U CN202320577253.XU CN202320577253U CN219760867U CN 219760867 U CN219760867 U CN 219760867U CN 202320577253 U CN202320577253 U CN 202320577253U CN 219760867 U CN219760867 U CN 219760867U
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- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to a 0-500V adjustable precision DC-DC converter, which comprises a shell and a conversion circuit, wherein the conversion circuit comprises an input filter circuit, an oscillation boosting circuit, a voltage doubling circuit and an output filter circuit which are sequentially connected, the input filter circuit is connected with a power input terminal of the DC-DC converter, and the output filter circuit is connected with a high-voltage output terminal of the DC-DC converter; the conversion circuit further comprises a sampling circuit and a control circuit, wherein the sampling circuit is connected with the high-voltage output terminal of the DC-DC converter so as to collect high-voltage output signals of the DC-DC converter; the control circuit is connected with the sampling circuit and the oscillation boosting circuit to control the switching frequency of the oscillation circuit. According to the scheme, the volume of the high-voltage power supply module can be reduced, the structure of the high-voltage power supply module is simplified, and the modularization degree of the high-voltage power supply module is improved, so that the working stability of the high-voltage power supply is improved, the maintenance difficulty of the high-voltage power supply module is reduced, and the use cost of the high-voltage power supply module is reduced.
Description
Technical Field
The utility model relates to the technical field of DC-DC converters, in particular to a 0-500V adjustable precision DC-DC converter.
Background
The DC-DC converter is a voltage converter that converts an input direct-current voltage into an output direct-current voltage. According to the difference of the level relationship between the input direct current voltage and the output direct current voltage, the DC/DC converter is classified into three types: step-up DC-DC converter, step-down DC-DC converter, and step-up DC-DC converter. At present, the DC-DC converter is widely applied to products such as automobiles, computers, mobile phones, displays, digital cameras, portable media players and the like.
The DC-DC converter may be used as a high voltage power module to provide a continuously adjustable direct current high voltage output in the range of 0V to ±500V to the load. Most of the boosting high-voltage power supply modules with the same voltage level in the prior art are large in size, complex in structure, low in modularization degree, low in working stability, high in maintenance difficulty and high in use cost.
Disclosure of Invention
In order to solve one or more of the above technical problems in the prior art, the utility model provides a 0-500V adjustable precision DC-DC converter, which is used for reducing the volume of a high-voltage power supply module, simplifying the structure, improving the modularization degree, adopting high-precision components for key circuits and improving the precision of the high-voltage power supply, thereby improving the working stability of the high-voltage power supply, reducing the maintenance difficulty and reducing the use cost.
The utility model provides a 0-500V adjustable precision DC-DC converter, which comprises a shell and a conversion circuit, wherein the conversion circuit comprises an input filter circuit, an oscillation boosting circuit, a voltage doubling circuit and an output filter circuit which are sequentially connected, the input filter circuit is connected with a power input terminal of the DC-DC converter, and the output filter circuit is connected with a high-voltage output terminal of the DC-DC converter; the conversion circuit further comprises a sampling circuit and a control circuit, wherein the sampling circuit is connected with the high-voltage output terminal of the DC-DC converter so as to collect high-voltage output signals of the DC-DC converter; the control circuit is connected with the sampling circuit and the oscillation boosting circuit to control the switching frequency of the oscillation boosting circuit.
In one embodiment, the input filter circuit comprises a first resistor and a first capacitor, wherein the first resistor is connected with a power input positive terminal of the DC-DC converter, the other end of the first resistor is connected with the first capacitor, and the connection point of the first resistor is an output end of the input filter circuit; the other end of the first capacitor is grounded.
In one embodiment, the oscillating boost circuit is a self-oscillating boost circuit comprising a second resistor, a third resistor, a second capacitor, a first transistor, and a boost transformer; one end of a primary coil of the step-up transformer is connected with the output end of the input filter circuit, the other end of the primary coil of the step-up transformer is connected with the collector of the first transistor, the emitter of the first transistor is grounded, the base of the first transistor is connected with one end of the second resistor, the other end of the second resistor is connected with one end of a feedback coil of the step-up transformer and serves as a base control end of the first transistor, the other end of the feedback coil of the step-up transformer is grounded after being connected with the second capacitor and the third resistor in series, and a secondary coil of the step-up transformer serves as the output end of the step-up transformer.
In one embodiment, the voltage doubling circuit is a voltage doubling circuit and comprises third to sixth capacitors and first to fourth diodes, wherein each voltage doubling circuit comprises one capacitor and one diode which are connected in series, the capacitors and the diodes are connected in series according to the principle of polarity addition so as to achieve the purpose of voltage doubling, the first stage voltage doubling circuit is connected with the secondary coil of the step-up transformer so as to input the voltage after the step-up, and the fourth stage voltage doubling circuit outputs four times of voltage.
In one embodiment, the output filter circuit includes a fourth resistor, a fifth resistor, a seventh capacitor, and an eighth capacitor, wherein the fourth and fifth resistors are connected in series, one end of the fourth resistor is connected to the output terminal of the voltage doubling circuit, one end of the fifth resistor is connected to the high voltage output terminal of the DC-DC converter, one end of the seventh capacitor is connected to a series node of the fourth and fifth resistors, the other end is connected to a virtual ground of the secondary winding of the step-up transformer, and the eighth capacitor is connected to the high voltage output terminal of the DC-DC converter.
In one embodiment, the sampling circuit is a voltage sampling circuit and comprises a first operational amplifier, a sixth resistor, a seventh resistor and a ninth capacitor, wherein one end of the sixth resistor is connected with the output end of the output filter circuit, the other end of the sixth resistor is connected with one end of the seventh resistor, the connection point of the seventh resistor is connected with the inverting input end of the first operational amplifier, and the other end of the seventh resistor is grounded; the non-inverting input end of the first operational amplifier is connected with the voltage regulating input end of the DC-DC converter; the ninth capacitor is connected with the reverse input end and the output end of the first operational amplifier; the output end of the first operational amplifier is connected with the voltage sampling output terminal of the DC-DC converter.
In one embodiment, the control circuit comprises a control chip and a peripheral circuit thereof, wherein an input end of the control circuit is connected with an output end of the sampling circuit; and the output end Vref of the control circuit is connected with the reference voltage output terminal of the DC-DC converter, and the Ctrl end is connected with the base electrode control end of the first transistor in the oscillation boosting circuit.
In one embodiment, the input voltage range of the DC-DC converter is 4.5-7V or 11-16V or 21-28V, and the output voltage range is 0V to + -500V.
In one embodiment, the shell is a five-sided metal shell shielding structure, the outline dimension of the shell is 12 multiplied by 12mm, the DC-DC converter is internally provided with a four-plate three-dimensional lap joint structure, the terminal pins of the DC-DC converter extend out of the sixth surface of the shell, and the pins of the input terminal and the output terminal of the DC-DC converter are gold-plated pins.
In one embodiment, the interior of the housing is filled with a high pressure resistant, thermally conductive adhesive.
The technical scheme of the utility model has the following beneficial technical effects:
the DC-DC converter adopts microminiature components and adopts a modularized three-dimensional welding mode, so that the volume of a high-voltage power supply module is reduced, the structure is simple, the modularization design is adopted, the modularization degree is high, the working stability of the high-voltage power supply is improved, the maintenance is easy, and the use cost is reduced.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:
fig. 1 is a schematic block diagram of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;
fig. 2 is a circuit schematic of an input filter circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;
fig. 3 is a circuit schematic of an oscillating boost circuit of a conversion circuit of a DC-DC converter according to an embodiment of the utility model;
fig. 4 is a circuit schematic of a voltage doubling circuit of a conversion circuit of a DC-DC converter according to an embodiment of the utility model;
fig. 5 is a circuit schematic of an output filter circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;
fig. 6 is a circuit schematic of a sampling circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;
fig. 7 is a schematic configuration diagram of a control circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model.
Fig. 8 is a schematic diagram of an internal structure of a DC-DC converter according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that when the terms "first," "second," and the like are used in the claims, the specification and the drawings of the present utility model, they are used merely for distinguishing between different objects and not for describing a particular sequential order. All the drawings and the description are only for the case where the high voltage output is positive voltage, and the case where the high voltage output is negative voltage is slightly adjusted internally, and will not be described here. The terms "comprises" and "comprising" when used in the specification and claims of the present utility model are taken to specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The utility model provides a 0-500V adjustable precision DC-DC converter, which comprises a shell and a conversion circuit. Fig. 1 is a schematic configuration diagram of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 1, the conversion circuit comprises an input filter circuit, an oscillation boosting circuit, a voltage doubling circuit, a sampling circuit and an output filter circuit which are sequentially connected, wherein the input filter circuit is connected with a power input terminal of the DC-DC converter, and the output filter circuit is connected with a high-voltage output terminal of the DC-DC converter; the conversion circuit further comprises a sampling circuit and a control circuit, wherein the sampling circuit is connected with the high-voltage output terminal of the DC-DC converter so as to collect high-voltage output signals of the DC-DC converter; the control circuit is connected with the sampling circuit and the oscillation boosting circuit to control the switching frequency of the oscillation boosting circuit so as to enable the oscillation boosting circuit to work normally.
Fig. 2 is a circuit schematic of an input filter circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 2, the input filter circuit includes a first resistor R1 and a first capacitor C1, where the first resistor R1 is connected with the first capacitor C1 to form an RC filter circuit, and is connected to a power input terminal of the DC-DC converter to filter an ac component in an input DC voltage signal, and output a filtered voltage Vf after passing through the RC filter circuit.
Fig. 3 is a circuit schematic of an oscillating boost circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 3, the oscillating boost circuit is a self-oscillating boost circuit, and includes a second resistor R2, a third resistor R3, a second capacitor C2, a first transistor Q1, and a boost transformer T1. One end of a primary coil of the step-up transformer T1 is connected with the voltage Vf after input filtering, the other end of the primary coil of the step-up transformer T1 is connected with a collector of the first transistor Q1, a base of the first transistor Q1 is jointly controlled by the step-up transformer feedback coil and the control circuit, the filtering voltage Vf is converted into alternating-current voltage by changing the switching frequency of the filtering voltage Vf, and then the alternating-current voltage is boosted by the step-up transformer. The secondary winding of the step-up transformer serves as the output end of the step-up transformer. In this design the virtual ground of the secondary winding of the step-up transformer communicates with the high voltage output ground of the DC-DC converter.
Fig. 4 is a circuit schematic of a voltage doubler circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 4, the voltage doubler circuit is a voltage doubler circuit including third to sixth capacitors and first to fourth diodes. Each voltage doubling circuit comprises a capacitor and a diode which are connected in series, and then the capacitors and the diodes are connected in series according to the principle of polarity addition so as to achieve the purpose of voltage doubling, the first voltage doubling circuit is connected with the Vr end of the secondary coil of the step-up transformer so as to input the voltage after the step-up, and the fourth voltage doubling circuit outputs the voltage Vm with four times of voltage. The voltage doubler circuit amplifies by discharging the switch of the diode and the capacitor. In this embodiment, the voltage doubling circuit is a voltage doubling circuit, and outputs a positive voltage. It will be appreciated that the polarity of the diodes in the voltage doubling circuit may be adjusted accordingly depending on the polarity of the DC-DC converter output voltage. The voltage doubling circuit can also be other voltage doubling circuits, such as a double voltage doubling circuit, according to the required output voltage; the output may be a negative voltage, and the diode direction may be adjusted, which is not particularly limited in the present utility model.
Fig. 5 is a circuit schematic of an output filter circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 5, the output filter circuit includes a fourth resistor R4, a fifth resistor R5, a seventh capacitor C7, and an eighth capacitor C8. Wherein the fourth resistor R4 and the seventh capacitor C7 form a first stage RC filter circuit; the fifth resistor R5 and the eighth capacitor C8 form a second-stage RC filter circuit, and the output terminal Vm of the voltage doubling circuit is connected to the high-voltage output terminal of the DC-DC converter after performing this second-stage filtering. The output filter circuit is used for filtering alternating current components of the voltage doubling voltage signal.
Fig. 6 is a circuit schematic of a sampling circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 6, the first operational amplifier U1, the sixth resistor R6, the seventh resistor R7, and the ninth capacitor C9 are included. The sixth resistor R6 and the seventh resistor R7 divide the high voltage output voltage Vout, sample the divided voltage, and input the sampled divided voltage to the inverting input terminal of the first operational amplifier U1, the non-inverting input terminal of the first operational amplifier U1 is connected to the voltage regulating signal Vadj input from the DC-DC converter, and the ninth capacitor C9 is connected to the inverting input terminal and the output terminal of the first operational amplifier U1 to form feedback. The first operational amplifier U1 compares and amplifies the collected voltage signal with the voltage adjustment signal Vadj input by the user, and outputs the voltage signal as Vs.
Fig. 7 is a schematic configuration diagram of a control circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 7, the control circuit includes a control chip and a peripheral circuit thereof, an input end of the control circuit is connected to an output Vs of the sampling circuit, and after the output Vs is processed, an output end Ctrl is used to control a first transistor Q1 in the oscillating boost circuit, so as to control a switching frequency of the oscillating boost circuit, so that a high-voltage output of the DC-DC converter reaches a user setting target and protects the DC-DC converter itself. The output signal is also provided with a reference voltage Vref which is sent to the outside and is used for a user to adjust the output high voltage.
Fig. 8 is a schematic diagram of an internal structure of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 8, the inside of the DC-DC converter adopts a four-plate three-dimensional lap joint structure, thereby reducing the volume of the DC-DC converter.
In some embodiments, the input voltage range of the DC-DC converter is 4.5-7V or 11-16V or 21-28V, and the output voltage range is 0V to + -500V. The output voltage is adjustable in the range of the output voltage, and a user can adjust the amplitude of the output high voltage through two modes of voltage adjustment or potentiometer adjustment.
In some embodiments, the housing is a five-sided metal shell shielding structure, the terminal pins of the DC-DC converter protrude from a sixth surface of the housing, the shell has the external dimension of 12 multiplied by 12mm, the cross section is smaller than one yuan coin, and the weight is only 5+/-1 g. The metal shell may be a copper shell or an aluminum shell. The pins of the input terminal and the output terminal of the DC-DC converter are gold-plated pins so as to ensure the strong oxidation resistance and the low resistance of the DC-DC converter. The number of terminals of the DC-DC converter is six. The conversion circuit adopts an SMT process for welding, and a double-layer four-plate three-dimensional process structure, so that the size of the converter is reduced.
In one embodiment, the interior of the housing is filled with a high pressure resistant, thermally conductive adhesive to expedite the dissipation of heat generated during operation of the conversion circuit.
The structure of the DC-DC converter of the present utility model is described in detail above by means of specific embodiments. In the use process, the input voltage is subjected to filtering treatment and then the oscillation frequency of the input voltage is controlled by the control circuit to be changed into alternating current, then the alternating current high voltage is output after the input voltage is subjected to boosting voltage doubling circuit, and finally the output is obtained after the filtering treatment is performed again. Meanwhile, in the module, output high voltage is fed back to a control loop through a sampling circuit so as to obtain stable output.
The DC-DC converter adopts microminiature components and adopts a modularized three-dimensional welding mode, so that the volume of a high-voltage power supply module is reduced, the structure is simple, the modularization design is adopted, the modularization degree is high, and key components are all high-precision components, so that the working stability of the high-voltage power supply is improved, the maintenance is easy, and the use cost is reduced.
It will be further understood by those skilled in the art from the foregoing description of the present specification that terms such as "upper," "lower," and the like, which indicate an orientation or a positional relationship, are based on the orientation or positional relationship shown in the drawings of the present specification, are for convenience only in describing aspects of the present utility model and simplifying the description, and do not explicitly or implicitly refer to devices or elements that must have the particular orientation, be constructed and operated in the particular orientation, and thus the above orientation or positional relationship terms should not be interpreted or construed as limiting aspects of the present utility model.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (9)
1. The 0-500V adjustable precision DC-DC converter comprises a shell and a conversion circuit, and is characterized in that the conversion circuit comprises an input filter circuit, an oscillation boosting circuit, a voltage doubling circuit and an output filter circuit which are sequentially connected, wherein the input filter circuit is connected with a power input terminal of the DC-DC converter, and the output filter circuit is connected with a high-voltage output terminal of the DC-DC converter;
the conversion circuit further comprises a sampling circuit and a control circuit, wherein the sampling circuit is connected with the high-voltage output terminal of the DC-DC converter so as to collect high-voltage output signals of the DC-DC converter; the control circuit is connected with the sampling circuit and the oscillation boosting circuit to control the switching frequency of the oscillation boosting circuit;
the input filter circuit comprises a first resistor and a first capacitor, wherein the first resistor is connected with a power input positive terminal of the DC-DC converter, the other end of the first resistor is connected with the first capacitor, and the connection point of the first resistor is the output end of the input filter circuit; the other end of the first capacitor is grounded.
2. The 0-500V adjustable precision DC-DC converter according to claim 1, wherein the oscillating boost circuit is a self-oscillating boost circuit comprising a second resistor, a third resistor, a second capacitor, a first transistor, and a boost transformer; one end of a primary coil of the step-up transformer is connected with the output end of the input filter circuit, the other end of the primary coil of the step-up transformer is connected with the collector of the first transistor, the emitter of the first transistor is grounded, the base of the first transistor is connected with one end of the second resistor, the other end of the second resistor is connected with one end of a feedback coil of the step-up transformer and serves as a base control end of the first transistor, the other end of the feedback coil of the step-up transformer is grounded after being connected with the second capacitor and the third resistor in series, and a secondary coil of the step-up transformer serves as the output end of the step-up transformer.
3. The 0-500V adjustable precision DC-DC converter according to claim 2, wherein the voltage doubling circuit is a four-voltage doubling circuit comprising third to sixth capacitors and first to fourth diodes, wherein each voltage doubling circuit comprises one capacitor and one diode connected in series, and then connected in series according to a principle of polarity addition to achieve the purpose of voltage doubling, the first voltage doubling circuit is connected with the secondary winding of the step-up transformer to input the boosted voltage, and the fourth voltage doubling circuit outputs a four-voltage.
4. The 0-500V adjustable precision DC-DC converter according to claim 2, wherein the output filter circuit comprises a fourth resistor, a fifth resistor, a seventh capacitor and an eighth capacitor, wherein the fourth and fifth resistors are connected in series, one end of the fourth resistor is connected to the output terminal of the voltage doubling circuit, one end of the fifth resistor is connected to the high voltage output terminal of the DC-DC converter, one end of the seventh capacitor is connected to a series node of the fourth and fifth resistors, the other end is connected to a virtual ground of the secondary winding of the step-up transformer, and the eighth capacitor is connected to the high voltage output terminal of the DC-DC converter.
5. The 0-500V adjustable precision DC-DC converter according to claim 1, wherein the sampling circuit is a voltage sampling circuit, and comprises a first operational amplifier, a sixth resistor, a seventh resistor and a ninth capacitor, wherein one end of the sixth resistor is connected to the output end of the output filter circuit, the other end of the sixth resistor is connected to one end of the seventh resistor, a connection point of the seventh resistor is connected to the inverting input end of the first operational amplifier, and the other end of the seventh resistor is grounded; the non-inverting input end of the first operational amplifier is connected with the voltage regulating input end of the DC-DC converter; the ninth capacitor is connected with the reverse input end and the output end of the first operational amplifier; the output end of the first operational amplifier is connected with the voltage sampling output terminal of the DC-DC converter.
6. The 0-500V adjustable precision DC-DC converter according to claim 2, wherein the control circuit comprises a control chip and its peripheral circuit, wherein an input terminal of the control circuit is connected to an output terminal of the sampling circuit; and the output end Vref of the control circuit is connected with the reference voltage output terminal of the DC-DC converter, and the Ctrl end is connected with the base electrode control end of the first transistor in the oscillation boosting circuit.
7. The 0-500V adjustable precision DC-DC converter according to any one of claims 1 to 6, wherein an input voltage range of the DC-DC converter is 4.5 to 7V or 11 to 16V or 21 to 28V, and an output voltage range is 0V to ±500V.
8. The 0-500V-adjustable precision DC-DC converter according to any one of claims 1 to 6, wherein the housing is a five-sided metal-case shielding structure, and the external dimension of the housing is 12 x 12mm; the DC-DC converter is internally provided with a four-plate three-dimensional lap joint structure; the terminal pins of the DC-DC converter extend out of the sixth surface of the shell, and the pins of the input terminal and the output terminal of the DC-DC converter are gold-plated pins.
9. The 0-500V adjustable precision DC-DC converter of claim 8 wherein the interior of the housing is filled with a high pressure resistant, thermally conductive adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320577253.XU CN219760867U (en) | 2023-03-22 | 2023-03-22 | 0-500V adjustable precision DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320577253.XU CN219760867U (en) | 2023-03-22 | 2023-03-22 | 0-500V adjustable precision DC-DC converter |
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| Publication Number | Publication Date |
|---|---|
| CN219760867U true CN219760867U (en) | 2023-09-26 |
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|---|---|---|---|
| CN202320577253.XU Active CN219760867U (en) | 2023-03-22 | 2023-03-22 | 0-500V adjustable precision DC-DC converter |
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| Country | Link |
|---|---|
| CN (1) | CN219760867U (en) |
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- 2023-03-22 CN CN202320577253.XU patent/CN219760867U/en active Active
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