CN221010009U - Negative power supply circuit based on positive DC/DC power supply - Google Patents
Negative power supply circuit based on positive DC/DC power supply Download PDFInfo
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- CN221010009U CN221010009U CN202323071948.XU CN202323071948U CN221010009U CN 221010009 U CN221010009 U CN 221010009U CN 202323071948 U CN202323071948 U CN 202323071948U CN 221010009 U CN221010009 U CN 221010009U
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- 239000003990 capacitor Substances 0.000 claims abstract description 108
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 description 4
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- 238000005457 optimization Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
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- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model relates to the field of negative power supply circuits, in particular to a negative power supply circuit based on a positive DC/DC power supply, which comprises a positive DC/DC power supply module and a negative power supply module, wherein the positive DC/DC power supply module comprises a DC/DC chip U8, the DC/DC chip U8 is provided with a high-voltage input end, a high-frequency pulse signal output end and a low-voltage output circuit, and the high-frequency pulse signal output end is connected with the input end of the low-voltage output circuit; the negative power supply module comprises a capacitor C42, a diode D36, a diode D33 and a capacitor C69, wherein one end of the capacitor C42 is connected with the high-frequency pulse signal output end, the other end of the capacitor C42 is respectively connected with the anode of the diode D36 and the cathode of the diode D33, the anode of the diode D36 is connected with one end of the capacitor C69, the other end of the capacitor C69 is connected with the anode of the diode D33, and the anode of the diode D33 is grounded; wherein the diode D36 anode serves as the negative power supply output. The circuit design utilizes the positive DC/DC power supply module and the negative power supply module, and saves the cost and complexity of searching a special negative power supply conversion chip.
Description
Technical Field
The utility model relates to the field of negative power supply circuits, in particular to a negative power supply circuit based on a positive DC/DC power supply.
Background
In circuit design, the scenario of requiring a negative power supply is relatively common, however, the methods of generating a negative power supply are relatively limited. Typically, the acquisition of the negative power supply requires the use of special I C or isolated switching power supplies, which, while viable, suffer from significant drawbacks.
First, some I C or equipment costs are high in existing solutions for negative power supplies, which makes the choice relatively limited for those cost applications. Second, these methods are bulky, which can be inconvenient for a scenario requiring a compact design, such as a mobile device or a system of specific size constraints. In addition, some conventional negative power solutions suffer from inefficiency, which may result in wasted energy or require additional heat dissipation measures.
In such a context, it is very important to find an innovative solution to generate the negative power supply.
Disclosure of Invention
In order to solve the problems, the utility model provides a negative power supply circuit based on a positive DC/DC power supply, which omits the cost and complexity of searching a special negative power supply conversion chip. By skillfully combining the original circuit elements, the generation of the negative power supply is realized, and the cost of the whole design is reduced.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the negative power supply circuit based on the positive DC/DC power supply comprises a positive DC/DC power supply module and a negative power supply module, wherein the positive DC/DC power supply module comprises a DC/DC chip U8, the DC/DC chip U8 is provided with a high-voltage input end, a high-frequency pulse signal output end and a low-voltage output circuit, and the high-frequency pulse signal output end is connected with the input end of the low-voltage output circuit;
The negative power supply module comprises a capacitor C42, a diode D36, a diode D33 and a capacitor C69, wherein one end of the capacitor C42 is connected with the high-frequency pulse signal output end, the other end of the capacitor C42 is respectively connected with the anode of the diode D36 and the cathode of the diode D33, the anode of the diode D36 is connected with one end of the capacitor C69, the other end of the capacitor C69 is connected with the anode of the diode D33, and the anode of the diode D33 is grounded; wherein the diode D36 anode serves as the negative power supply output.
As a further optimization scheme, the low-voltage output circuit comprises an inductor L7, a capacitor C106, a capacitor C38 and a capacitor C39, wherein one end of the inductor L7 is connected with the high-frequency pulse signal output end, the other end of the inductor L7 is used as a low-voltage output end, one ends of the capacitor C106, the capacitor C38 and the capacitor C39 are connected with the low-voltage output end, and the other ends of the capacitor C106, the capacitor C38 and the capacitor C39 are grounded.
As a further optimization scheme, the DC/DC chip comprises an output voltage feedback sampling circuit, wherein the output voltage feedback sampling circuit comprises a resistor R138 and a resistor R126, a No. 5 pin of the DC/DC chip U8 is connected with a negative power supply output end through the resistor R138, and the No. 5 pin of the DC/DC chip U8 is grounded through the resistor R126.
As a further optimization scheme, the circuit comprises a peripheral circuit, wherein the peripheral circuit comprises a capacitor C41, a capacitor C103, a resistor R31, a resistor R137, a capacitor C84 and a capacitor C40, a pin 7 of a DC/DC chip U8 is connected with a pin 2 of the DC/DC chip U8 through the resistor R31, a pin 7 of the DC/DC chip U8 is grounded through the capacitor C41, a pin 7 of the DC/DC chip U8 is connected with one end of the capacitor C103 through the resistor R137, and the other end of the capacitor C103 is grounded; the pin 8 of the DC/DC chip U8 is grounded through a capacitor C40, and the pin 1 of the DC/DC chip U8 is connected with the pin 3 of the DC/DC chip U8 through a capacitor C84.
The utility model has the beneficial effects that:
1. The circuit design utilizes the positive DC/DC power supply module and the negative power supply module, and saves the cost and complexity of searching a special negative power supply conversion chip. By skillfully combining the original circuit elements, the generation of the negative power supply is realized, and the cost of the whole design is reduced. The devices employed at the same time are relatively easy to obtain on the market, unlike some dedicated negative power supply modules, which may help reduce manufacturing costs and ease of maintenance.
2. The high-frequency pulse signal generated from the positive DC/DC power supply module can be effectively converted into a required negative power supply output through the modes of charging, discharging and loop circulation. This approach can achieve relatively high energy utilization, making the system more energy efficient.
Drawings
Fig. 1 is a specific circuit diagram of a negative power supply circuit based on a positive DC/DC power supply.
Detailed Description
Referring to fig. 1, the utility model relates to a negative power circuit based on a positive DC/DC power supply, which comprises a positive DC/DC power supply module and a negative power supply module, wherein the positive DC/DC power supply module comprises a DC/DC chip U8, the DC/DC chip U8 is provided with a high-voltage input end, a high-frequency pulse signal output end and a low-voltage output circuit, and the high-frequency pulse signal output end is connected with the input end of the low-voltage output circuit;
The negative power supply module comprises a capacitor C42, a diode D36, a diode D33 and a capacitor C69, wherein one end of the capacitor C42 is connected with the high-frequency pulse signal output end, the other end of the capacitor C42 is respectively connected with the anode of the diode D36 and the cathode of the diode D33, the anode of the diode D36 is connected with one end of the capacitor C69, the other end of the capacitor C69 is connected with the anode of the diode D33, and the anode of the diode D33 is grounded; wherein the diode D36 anode serves as the negative power supply output.
In this embodiment, the low voltage output circuit includes an inductor L7, a capacitor C106, a capacitor C38, and a capacitor C39, where one end of the inductor L7 is connected to the high frequency pulse signal output end, the other end of the inductor L7 is used as the low voltage output end, and one ends of the capacitor C106, the capacitor C38, and the capacitor C39 are all connected to the low voltage output end, and the other ends of the capacitor C106, the capacitor C38, and the capacitor C39 are grounded.
In this embodiment, the output voltage feedback sampling circuit further includes a resistor R138 and a resistor R126, where pin No. 5 of the DC/DC chip U8 is connected to the negative power supply output terminal through the resistor R138, and pin No. 5 of the DC/DC chip U8 is further grounded through the resistor R126.
In this embodiment, the peripheral circuit further includes a capacitor C41, a capacitor C103, a resistor R31, a resistor R137, a capacitor C84, and a capacitor C40, where pin 7 of the DC/DC chip U8 is connected to pin 2 of the DC/DC chip U8 through the resistor R31, pin 7 of the DC/DC chip U8 is grounded through the capacitor C41, pin 7 of the DC/DC chip U8 is connected to one end of the capacitor C103 through the resistor R137, and the other end of the capacitor C103 is grounded; wherein the No. 8 pin of the DC/DC chip U8 is grounded through a capacitor C40, and the No. 1 pin of the DC/DC chip U8 is connected with the No. 3 pin of the DC/DC chip U8 through a capacitor C84
The resistor R31, the capacitor C41, the resistor R137 and the capacitor C103 form a filter voltage stabilizing circuit. The purpose of this peripheral circuit is to ensure stable operation of the DC/DC chip U8. Combinations of capacitive, resistive, etc. elements are commonly used in power supply circuits to control voltage and current fluctuations, filter noise, and ensure stable operation of the chip
The working principle shows that the DC/DC power supply chip U8 and the peripheral circuit form a DC/DC circuit with +12V input and +5V output, and the power supply output capacity can reach 5V/3A.
The 12V power supply in the circuit is input through a 2 pin (high-voltage input end) of a DC/DC chip U8, then a high-frequency pulse signal with energy is output through a U8 internal circuit at a 3 pin (high-frequency pulse signal output end), the high-frequency pulse charges an inductor L7, the inductor L7 stores energy, the current on the inductor L7 cannot be suddenly changed when the pulse low level arrives, the inductor L7 continues to have current output, and the output end is filtered through a capacitor C106, a capacitor C38 and a capacitor C39, so that the +5V power supply is obtained. Resistor R138 and resistor R126 complete the feedback of +5V sample, control +5V output stabilization. C84 C40R 31C 41R 137C 103 constitute peripheral circuits for letting the DC/DC power supply chip U8 stably operate.
The negative power supply module completes the power supply of-12V, the working principle is that when the high voltage pulse of the DC/DC chip U8 arrives, the capacitor C42 is charged through the diode D36, a charging result of right positive left negative is obtained on the capacitor C42, when the low voltage pulse of the DC/DC chip U8 arrives, the capacitor C42 is equivalent to the right grounding of the capacitor C42, the voltage on the capacitor C42 cannot be suddenly changed, the capacitor C42 cannot be discharged through the D36, and only a discharging loop can be formed through the diode D33 and the capacitor C69, thus the capacitor C69 is charged due to the discharging of the capacitor C42, the charging result of the capacitor C69 is positive below, negative above, the capacitor C69 is grounded below, and the capacitor C69 is negative above, thus the negative voltage power supply is needed. Capacitor C42 is constantly charged by the pulse of DC/DC chip U8, capacitor C42 is discharged, and capacitor C69 is constantly charged, thus obtaining a-12V power supply.
The negative voltage of the capacitor C69 can be understood as well, when the pulse low voltage of the DC/DC chip U8 arrives after the capacitor C42 is charged, the right side of the capacitor C42 is grounded, and the voltages on the two sides of the capacitor C42 cannot be suddenly changed, so that the voltage on the left side of the capacitor C42 becomes negative, the negative voltage is changed from 0V to negative voltage through D33, the upper end of the capacitor C69 can be transferred to the capacitor C69, and through continuous charging and discharging, the voltage on the capacitor C69 is finally-12V. This should be a pulse maximum voltage of 12V, then the capacitor is full of 12V and the transfer maximum is 12V, hence a-12V voltage. And finally, a voltage larger than-12V is obtained in an idle test, which is caused by an inductance L7, the voltage exceeding-12V is very small in energy, and the voltage can be eliminated only by carrying a resistance of 5 k.
In summary, in a practical circuit design, a negative power supply is required, and the method and I C capable of providing the negative power supply are very few in reality and have a very low cost. The utility model skillfully utilizes the DC/DC switching power supply to skillfully obtain the negative power supply. The carrying capacity is comparable to that of some special positive and negative power conversion chips. As shown in the figure, one end of the inductor L7 is connected to the output of the DC/DC switching power supply chip, and after the filtering and freewheeling of the energy stored by the inductor, the +5v output is obtained on the capacitors C102 and C38 and C39. This is the main function of this DC/DC power conversion. Is also the original design of the power supply.
The circuit design in this particular embodiment is not only capable of providing the required +5v DC power supply, but also is capable of successfully achieving the required-12V power supply. This dual function is very useful for many circuits and systems, as many applications require the use of both positive and negative power supplies. The flexibility and comprehensiveness of this design makes it suitable for use in a variety of different electronic devices and application scenarios. By a single design, the requirements of both positive and negative power supplies can be met without the need for additional complex circuitry or components. This not only saves costs but also makes the whole system more simplified and compact. Implementing dual power functions also helps to simplify the design and maintenance of the overall system, as the use of two separate power systems can be avoided.
The above embodiments are merely illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the design of the present utility model.
Claims (4)
1. A negative power supply circuit based on a positive DC/DC power supply, characterized by: the DC/DC power supply comprises a positive DC/DC power supply module and a negative power supply module, wherein the positive DC/DC power supply module comprises a DC/DC chip U8, the DC/DC chip U8 is provided with a high-voltage input end, a high-frequency pulse signal output end and a low-voltage output circuit, and the high-frequency pulse signal output end is connected with the input end of the low-voltage output circuit; the negative power supply module comprises a capacitor C42, a diode D36, a diode D33 and a capacitor C69, wherein one end of the capacitor C42 is connected with the high-frequency pulse signal output end, the other end of the capacitor C42 is respectively connected with the anode of the diode D36 and the cathode of the diode D33, the anode of the diode D36 is connected with one end of the capacitor C69, the other end of the capacitor C69 is connected with the anode of the diode D33, and the anode of the diode D33 is grounded; with the anode of diode D36 as the negative power supply output.
2. A negative power supply circuit based on a positive DC/DC power supply according to claim 1, characterized in that: the low-voltage output circuit comprises an inductor L7, a capacitor C106, a capacitor C38 and a capacitor C39, wherein one end of the inductor L7 is connected with the high-frequency pulse signal output end, the other end of the inductor L7 is used as a low-voltage output end, one ends of the capacitor C106, the capacitor C38 and the capacitor C39 are connected with the low-voltage output end, and the other ends of the capacitor C106, the capacitor C38 and the capacitor C39 are grounded.
3. A negative power supply circuit based on a positive DC/DC power supply according to claim 2, characterized in that: the DC/DC chip U8 is characterized by further comprising an output voltage feedback sampling circuit which comprises a resistor R138 and a resistor R126, wherein the No. 5 pin of the DC/DC chip U8 is connected with the output end of the negative power supply through the resistor R138, and the No. 5 pin of the DC/DC chip U8 is grounded through the resistor R126.
4. A negative power supply circuit based on a positive DC/DC power supply according to claim 2, characterized in that: the circuit also comprises a peripheral circuit, wherein the peripheral circuit comprises a capacitor C41, a capacitor C103, a resistor R31, a resistor R137, a capacitor C84 and a capacitor C40, wherein the pin 7 of the DC/DC chip U8 is connected with the pin 2 of the DC/DC chip U8 through the resistor R31, the pin 7 of the DC/DC chip U8 is grounded through the capacitor C41, the pin 7 of the DC/DC chip U8 is connected with one end of the capacitor C103 through the resistor R137, and the other end of the capacitor C103 is grounded; the pin 8 of the DC/DC chip U8 is grounded through a capacitor C40, and the pin 1 of the DC/DC chip U8 is connected with the pin 3 of the DC/DC chip U8 through a capacitor C84.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323071948.XU CN221010009U (en) | 2023-11-14 | 2023-11-14 | Negative power supply circuit based on positive DC/DC power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323071948.XU CN221010009U (en) | 2023-11-14 | 2023-11-14 | Negative power supply circuit based on positive DC/DC power supply |
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| CN221010009U true CN221010009U (en) | 2024-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202323071948.XU Active CN221010009U (en) | 2023-11-14 | 2023-11-14 | Negative power supply circuit based on positive DC/DC power supply |
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- 2023-11-14 CN CN202323071948.XU patent/CN221010009U/en active Active
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