CN220043238U - 0-1 kV adjustable precision DC-DC converter - Google Patents
0-1 kV adjustable precision DC-DC converter Download PDFInfo
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- CN220043238U CN220043238U CN202320625156.3U CN202320625156U CN220043238U CN 220043238 U CN220043238 U CN 220043238U CN 202320625156 U CN202320625156 U CN 202320625156U CN 220043238 U CN220043238 U CN 220043238U
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Abstract
The utility model relates to a 0-1 kV adjustable precision DC-DC converter, which comprises a shell and a conversion circuit, wherein the conversion circuit comprises an input filter circuit, an oscillating circuit, a step-up transformer, 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 a high-voltage output signal of the DC-DC converter so as to acquire the output voltage of the high-voltage output signal; the control circuit is connected with the sampling circuit and the oscillating circuit to control the oscillating circuit. The DC-DC converter can reduce the volume of the high-voltage power supply module, simplify the structure of the high-voltage power supply module and improve the modularization degree of the high-voltage power supply module, 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 general, in particular to a 0-1 kV 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 DC high voltage output to a load in the range of 0V to +/-1000V. 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 technical problems in the prior art, the utility model provides the 0-1 kV adjustable precision DC-DC converter, so that the volume of a high-voltage power supply module is reduced, the structure of the high-voltage power supply module is simplified, the modularization degree of the high-voltage power supply module is improved, high-precision components are adopted in key circuits, and the precision of the high-voltage power supply is improved, thereby improving the working stability of the high-voltage power supply, reducing the maintenance difficulty and the use cost of the high-voltage power supply.
The utility model provides a 0-1 kV adjustable precision DC-DC converter, which comprises a shell and a conversion circuit, wherein the conversion circuit comprises an input filter circuit, an oscillating circuit, a voltage doubling circuit, a sampling circuit and an output filter circuit which are sequentially connected, the input filter circuit is connected with a power supply 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 control circuit is connected with the sampling circuit and the oscillating circuit to control the oscillating circuit; the oscillating circuit is a self-excited oscillation boosting circuit and comprises a second resistor, a first transistor, a second transistor and a boosting transformer, wherein a primary coil of the boosting transformer is formed by connecting two coils in series, a middle tap is connected with an output end of the input filter circuit, two ends of the primary coil of the boosting transformer are respectively connected with a collector electrode of the first transistor and a collector electrode of the second transistor, an emitter electrode of the first transistor and an emitter electrode of the second transistor are grounded, a base electrode of the first transistor and a base electrode of the second transistor are respectively connected with two ends of a feedback coil of the boosting transformer, one end of the second resistor is connected with a base electrode of the second transistor, the other end of the second resistor is connected with an output end of the control circuit, and a secondary coil of the boosting transformer is used as an output end of the boosting transformer.
In one embodiment, the input filter circuit comprises a first resistor and a first capacitor, wherein the first resistor is connected with a positive power input terminal of the DC-DC converter, the other end of the first resistor is connected with the first capacitor, the connection point of the first resistor is the output end of the input filter circuit, and the other end of the first capacitor is grounded.
In one embodiment, the voltage doubling circuit is a voltage doubling circuit comprising second to fifth capacitors and first to fourth diodes. Each stage of voltage doubling 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 stage of 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 of voltage doubling circuit outputs the voltage of four times of voltage. The polarity of the diode in the voltage doubling circuit can be correspondingly adjusted according to the polarity of the output voltage of the DC-DC converter.
In one embodiment, the output filter circuit includes a third resistor, a fourth resistor, a sixth capacitor, and a seventh capacitor. The third resistor and the fourth resistor are connected in series, one end of the third resistor is connected with the output end of the voltage doubling circuit, one end of the fourth resistor is connected with the high-voltage output terminal of the DC-DC converter, one end of the sixth capacitor is connected with a series node of the third resistor and the fourth resistor, the other end of the sixth capacitor is connected with virtual ground of the secondary coil of the step-up transformer, and the seventh capacitor is connected with the high-voltage output two ends of the DC-DC converter.
In one embodiment, the sampling circuit is a voltage sample and includes a first operational amplifier, a fifth resistor, a sixth resistor, and an eighth capacitor. One end of the fifth resistor is connected with the output end of the output filter circuit, the other end of the fifth resistor is connected with one end of the sixth resistor, a node of the fifth resistor is input to the inverting input end of the first operational amplifier, and the other end of the sixth 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 eighth 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 includes a control chip and its peripheral circuitry. The input end of the control circuit is connected with the 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 second transistor in the oscillating circuit through a resistor.
In one embodiment, the DC-DC converter has an input voltage ranging from 4.5 to 7V or 11 to 16V or 21 to 28V, an output voltage ranging from 0V to +/-1000V, and an output current ranging from 0.5mA to 3mA.
In one embodiment, the shell is a five-sided metal shell shielding structure, the external dimension of the shell is 25.4x15.2x10.5 mm, the inside of the DC-DC converter is a double-plate three-dimensional stacked structure, terminal pins of the DC-DC converter extend out from 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 stacking 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 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 0-1 kV 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 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 used for collecting a high-voltage output signal of the DC-DC converter; the control circuit is mainly used for controlling the switching frequency of the DC-DC converter to enable the DC-DC converter 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 the input DC voltage signal Vin, and output a filtered voltage Vf after passing through the RC filter circuit.
Fig. 3 is a circuit schematic of an oscillating circuit of a conversion circuit of a DC-DC converter according to an embodiment of the utility model. As shown in fig. 3, the oscillating circuit is a self-oscillating boost circuit, and includes a second resistor R2, a first transistor Q1, a second transistor Q2, and a boost transformer T1. The primary coil of the step-up transformer T1 is formed by connecting two coils in series, a tap in the middle is connected with the voltage Vf after input filtering, two ends of the primary coil are respectively connected with collectors of the first transistor Q1 and the second transistor Q2, the first transistors Q1 and Q2 are jointly controlled by a feedback coil of the step-up transformer T1 and a Ctrl end of the control circuit, the filtered voltage Vf is converted into alternating voltage by changing the switching frequency of the alternating voltage, and then the alternating voltage is boosted by the step-up transformer. The secondary coil of the step-up transformer is used as the output end of the step-up transformer, and the output end of the secondary coil of the step-up transformer T1 is respectively identified as Vr and Vg.
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 doubling circuit is a voltage doubling circuit, and includes second to fifth capacitors and first to fourth diodes. Each stage of voltage doubling 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 stage of voltage doubling circuit is connected with the Vr end of the secondary coil of the step-up transformer so as to input the boosted voltage, and the fourth stage of 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 should be understood that the voltage doubling circuit may be other voltage doubling circuits, such as a voltage doubling circuit, depending on the magnitude of the desired 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 third resistor R3, a fourth resistor R4, a sixth capacitor C6, and a seventh capacitor C7. Wherein the third resistor R3 and the sixth capacitor C6 form a first stage RC filter circuit; the fourth resistor R4 and the seventh capacitor C7 form a second-stage RC filter circuit, the output terminal Vm of the voltage doubling circuit is connected with the high-voltage output terminal of the DC-DC converter after the second-stage filtering, the output voltage is identified as Vout, and HGND is the corresponding ground potential. 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 fifth resistor R5, the sixth resistor R6, and the eighth capacitor C8 are included. The fifth resistor R5 and the sixth resistor R6 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 eighth capacitor C8 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 second transistor Q2 in the oscillating circuit, so as to control a switching frequency of the oscillating 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 double-plate stacked three-dimensional lap joint structure, thereby reducing the volume of the DC-DC converter.
In one embodiment, the DC-DC converter has an input voltage ranging from 4.5 to 7V or 11 to 16V or 21 to 28V, an output voltage ranging from 0V to +/-1000V, and an output current ranging from 0.5mA to 3mA. 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 one embodiment, the housing is a five-sided metal shell shielding structure, the terminal pins of the DC-DC converter protrude from the sixth surface of the housing, and the housing has an external dimension of 25.4×15.2×10.5mm and weighs less than 15 grams. 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 five. The conversion circuit adopts SMT technology welding, and double plates are stacked to form a three-dimensional technology 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 0-1 kV adjustable precision DC-DC converter of the utility model is described in detail above by specific examples. 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 is output through the boosting voltage doubling circuit, and finally the direct current high voltage is output 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 0-1 kV adjustable precision 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)
1.0-1 kV adjustable precision DC-DC converter, comprising a shell and a conversion circuit, characterized in that the conversion circuit comprises an input filter circuit, an oscillating 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 used for collecting output voltage signals of the DC-DC converter, and the control circuit is connected with the sampling circuit and the oscillating circuit so as to control the switching frequency of the oscillating circuit;
the oscillating circuit is a self-excited oscillation boosting circuit and comprises a second resistor, a first transistor, a second transistor and a boosting transformer, wherein a primary coil of the boosting transformer is formed by connecting two coils in series, a middle tap is connected with an output end of the input filter circuit, two ends of the primary coil of the boosting transformer are respectively connected with a collector electrode of the first transistor and a collector electrode of the second transistor, an emitter electrode of the first transistor and an emitter electrode of the second transistor are grounded, a base electrode of the first transistor and a base electrode of the second transistor are respectively connected with two ends of a feedback coil of the boosting transformer, one end of the second resistor is connected with a base electrode of the second transistor, the other end of the second resistor is connected with an output end of the control circuit, and a secondary coil of the boosting transformer is used as an output end of the boosting transformer.
2. The 0-1 kV adjustable precision DC-DC converter according to claim 1, wherein the input filter circuit comprises a first resistor and a first capacitor, wherein the first resistor is connected with a positive power input terminal of the DC-DC converter, the other end of the first resistor is connected with the first capacitor, the connection point of the first resistor is the output end of the input filter circuit, and the other end of the first capacitor is grounded.
3. The 0-1 kV adjustable precision DC-DC converter according to claim 1, wherein the voltage doubling circuit is a voltage doubling circuit, and includes second to fifth capacitors and first to fourth diodes, wherein each voltage doubling circuit includes 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 to the secondary winding of the step-up transformer to input the boosted voltage, and the fourth voltage doubling circuit outputs a voltage of four times.
4. The 0-1 kV adjustable precision DC-DC converter according to claim 1, wherein the output filter circuit comprises a third resistor, a fourth resistor, a sixth capacitor and a seventh capacitor, wherein the third resistor and the fourth resistor are connected in series, one end of the third resistor is connected to the output terminal of the voltage doubling circuit, one end of the fourth resistor is connected to the high voltage output terminal of the DC-DC converter, one end of the sixth capacitor is connected to a series node of the third resistor and the fourth resistor, the other end is connected to a virtual ground of the secondary winding of the step-up transformer, and the seventh capacitor is connected to the high voltage output terminal of the DC-DC converter.
5. The 0-1 kV adjustable precision DC-DC converter according to claim 1, wherein the sampling circuit is a voltage sample and comprises a first operational amplifier, a fifth resistor, a sixth resistor and an eighth capacitor, wherein one end of the fifth resistor is connected with the output end of the output filter circuit, the other end of the fifth resistor is connected with one end of the sixth resistor, a node of the sixth resistor is input to the inverting input end of the first operational amplifier, and the other end of the sixth 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 eighth 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 0-1 kV adjustable precision DC-DC converter according to claim 1, wherein the control circuit comprises a control chip and a peripheral circuit thereof, and the input end of the control circuit is connected with the 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 second transistor in the oscillating circuit through a resistor.
7. The 0-1 kV tunable precision DC-DC converter according to any one of claims 1 to 6, wherein an input voltage range of the DC-DC converter is 4.5-7V or 11-16V or 21-28V, an output voltage range is 0V to +/-1000V, and an output current range is 0.5 mA-3 mA.
8. The 0-1 kV tunable precision DC-DC converter according to any one of claims 1 to 6, wherein the housing is a five-sided metal-shell shielding structure, and an external dimension of the housing is 25.4×15.2×10.5mm; the DC-DC converter is internally provided with a double-plate three-dimensional stacking 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 0-1 kV adjustable precision DC-DC converter according to claim 8, wherein the inside of the case is filled with high pressure resistant heat conductive glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320625156.3U CN220043238U (en) | 2023-03-27 | 2023-03-27 | 0-1 kV adjustable precision DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320625156.3U CN220043238U (en) | 2023-03-27 | 2023-03-27 | 0-1 kV adjustable precision DC-DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220043238U true CN220043238U (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320625156.3U Active CN220043238U (en) | 2023-03-27 | 2023-03-27 | 0-1 kV adjustable precision DC-DC converter |
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| Country | Link |
|---|---|
| CN (1) | CN220043238U (en) |
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- 2023-03-27 CN CN202320625156.3U patent/CN220043238U/en active Active
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