CN214014111U - Direct-current high-voltage input step-down conversion circuit and terminal device - Google Patents
Direct-current high-voltage input step-down conversion circuit and terminal device Download PDFInfo
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- CN214014111U CN214014111U CN202022732255.0U CN202022732255U CN214014111U CN 214014111 U CN214014111 U CN 214014111U CN 202022732255 U CN202022732255 U CN 202022732255U CN 214014111 U CN214014111 U CN 214014111U
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Abstract
The utility model discloses a direct current high pressure input step-down converting circuit and terminating set, step-down converting circuit includes the step-down chip, the first voltage division module of being connected with the step-down chip, switch circuit, filter circuit and second voltage division module, the enable end of step-down chip is connected to first voltage division module, and the step-down chip is connected to switch circuit's input, switch circuit includes MOSFET pipe switch circuit, and switching on and turn-off of step-down chip output level signal control MOSFET pipe switch circuit, filter circuit's input is connected to switch circuit's output, and second voltage division module is connected to filter circuit's output, exports stable voltage U1 after the step-down of second voltage division module. The utility model discloses output ground voltage accessible modification divider resistance adjusts, and the circuit commonality is strong, uses extensively, can regard as industry standard circuit extensively to promote.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a direct current high voltage input step-down converting circuit and terminating set.
Background
The mainboard is one of the most basic and important components of the computer, plays a very important role in the whole computer system, and the performance of the mainboard directly influences the working stability of the whole computer system, so the power supply of the mainboard system is of fundamental importance.
The conventional main board is basically input and supplied with power by a direct current 12V or 19V voltage power supply, the power supply voltage is basically in the voltage-resistant range of common components of a system power supply circuit, and the power supply voltage can be directly used for system input and power supply without influencing the normal work of a main board system. Therefore, a high-power voltage reduction conversion circuit is not needed. However, for a motherboard which is required to meet the requirement of high-voltage (such as more than 24V) power input, because the withstand voltage range of a common component of the motherboard is limited, most of the motherboard cannot meet the application requirement of high-voltage input, the high input voltage can directly cause the burning out of components, and the higher the withstand voltage value, the higher the cost of the components, besides the difficulty in material selection, the unnecessary material cost is also additionally increased.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides a can satisfy direct current high voltage input step-down converting circuit and terminal device of high voltage power supply input mainboard power supply.
The utility model provides a direct current high pressure input step-down converting circuit, including the step-down chip, the first voltage division module of being connected with the step-down chip, switch circuit, filter circuit and second voltage division module, the enable end of step-down chip is connected to first voltage division module, and the step-down chip is connected to switch circuit's input, switch circuit includes MOSFET pipe switch circuit, and switching on and turn-off of step-down chip output level signal control MOSFET pipe switch circuit, filter circuit's input is connected to switch circuit's output, and second voltage division module is connected to filter circuit's output, exports stable voltage U1 after the step-down of second voltage division module.
Optionally, the first voltage-dividing module includes a first voltage-dividing resistor and a second voltage-dividing resistor, a first end of the first voltage-dividing resistor is connected to an external power supply, a second end of the first voltage-dividing resistor is connected to a first end of the second voltage-dividing resistor and a power input end of the voltage-reducing chip, respectively, and a second end of the second voltage-dividing resistor is grounded.
Optionally, the MOSFET switching circuit includes a first MOSFET and a second MOSFET, a first end of the first MOSFET is connected to the TG terminal of the buck chip, a second end of the first MOSFET is connected to an external power source, a third end of the first MOSFET is connected to a second end of the second MOSFET, a second end of the second MOSFET is further connected to the filter circuit, and a first end of the second MOSFET is connected to the BG terminal of the buck chip.
Optionally, the filter circuit comprises a filter inductor.
Optionally, the voltage divider further comprises a filter capacitor, and the filter capacitor is connected to the second voltage dividing module.
Optionally, the second voltage division module includes a third voltage division resistor and a fourth voltage division resistor, a first end of the third voltage division resistor is connected to the inductor and the filter capacitor, respectively, a second end of the third voltage division resistor is connected to a first end of the fourth voltage division resistor, and a second end of the fourth resistor is grounded.
Optionally, the voltage U1 is 0.8 (1+ third dividing resistor/fourth dividing resistor) V.
Optionally, the voltage reduction chip is an MP9928-C758 chip.
The utility model also provides a terminal device, including a circuit board, be provided with above-mentioned arbitrary one on the circuit board direct current high voltage input step-down converting circuit for the circuit board power supply after stepping down direct current high voltage.
The utility model provides a direct current high voltage input step-down converting circuit and terminating set, step-down converting circuit include the step-down chip, first voltage division module, and switch circuit, filter circuit and second voltage division module, the enable end of step-down chip is connected to first voltage division module, and when direct current high voltage power supply mainboard, direct current high voltage need provide safety and stability's system input power supply for the mainboard after stepping down through the circuit conversion, consequently for prior art, the embodiment of the utility model provides an output earth voltage accessible modifies the divider resistance and adjusts, and the circuit commonality is strong, uses extensively, can regard as industry standard circuit to extensively promote.
Drawings
Fig. 1 is a schematic structural diagram of a dc high-voltage input buck conversion circuit of the present invention;
fig. 2 is a schematic diagram of an internal circuit of the dc high-voltage input step-down conversion circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
When the direct-current high-voltage power supply supplies power to the mainboard, the direct-current high voltage needs to be converted and reduced by the circuit to provide safe and stable system input power for the mainboard. Please refer to fig. 1, the utility model provides a direct current high voltage input step-down converting circuit, lie in between direct current high voltage and the mainboard, direct current high voltage input step-down converting circuit includes first voltage division module 10, step-down chip 20, switch circuit 30, filter circuit 40 and second voltage division module 50, and first voltage division module 10 is connected step-down chip 20's enable end, and step-down chip 20 is connected to switch circuit 30's input, switch circuit 30 includes MOSFET tube switch circuit, and switching on and shutting off of step-down chip 20 output level signal control MOSFET tube switch circuit, and filter circuit 40's input is connected to MOSFET tube switch circuit's output, and second voltage division module 50 is connected to filter circuit 40's output, exports stable voltage U1 after second voltage division module 50 steps down.
The utility model discloses direct current high voltage inputs the enable end of step-down chip 20 after 10 partial pressures of first division module, and control step-down chip 20 starts and works, and is concrete, and when direct current high voltage was greater than first preset voltage through output voltage behind 10 partial pressures of first division module, step-down chip 20 started and works, and when output voltage after 10 partial pressures of first division module was less than first preset voltage, step-down chip 20 stop work. When the buck chip 20 is started and works, the buck chip 20 outputs a high level and a low level to control the on/off of the switch circuit 30, and further controls the output pulse width state of the PWM signal, thereby controlling the buck chip 20 to output a stable voltage. The voltage output by the buck chip 20 is filtered by the filter circuit 40, and then divided by the second voltage dividing module 50 to output a stable voltage U1.
In one embodiment of the present invention, please refer to fig. 2, the first voltage-dividing module 10 includes a first voltage-dividing resistor R4 and a second voltage-dividing resistor R5, a first end of the first voltage-dividing resistor R4 is connected to an external power source, a second end of the first voltage-dividing resistor R5 is connected to a power input of the voltage-reducing chip, and a second end of the second voltage-dividing resistor R5 is grounded. The present embodiment controls the output voltage of the first voltage-dividing module 10 and controls the start or stop of the buck chip 20 by controlling the resistances of the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5.
In one embodiment of the present invention, please refer to fig. 2, the MOSFET switch circuit includes a first MOSFET tube PQ1 and a second MOSFET tube PQ2, a first end of the first MOSFET tube PQ1 is connected to the TG terminal of the buck chip through a resistor R7, a second terminal is connected to an external power source, capacitors C1, C2 and C3, capacitors C1, C2 and C3 are grounded, a third end of the first MOSFET tube PQ1 is connected to the second end of the second MOSFET tube PQ2 and to the SW pin of the buck chip 20, a second end of the second MOSFET tube PQ2 is further connected to the filter circuit 40, and a first end of the second MOSFET tube PQ2 is connected to the BG terminal of the buck chip 20 through a resistor R9 and to the ground through a capacitor C8. The buck chip 20 controls the levels of the TG pin signal and the BG pin signal through the internal driver to control the high-low side mosfets PQ1 and PQ2 to perform switching operation, when the voltage value of the voltage difference VGS between the first end and the third end of PQ1 reaches the threshold voltage for the mosfet to be turned on, the voltage value is turned on, and when the voltage value VGS is lower than the threshold voltage, the mosfet is turned off; PQ2 is turned on when the voltage value of BG pin signal reaches the threshold voltage of MOSFET turn-on, and is turned off when the voltage value is lower than the threshold voltage. The filter circuit 40 includes an inductor L1.
In one embodiment of the present invention, please refer to fig. 2, the dc high voltage input buck conversion circuit further includes a filter capacitor, and the filter capacitor is connected to the second voltage dividing module 50. The second voltage dividing module 50 includes a third voltage dividing resistor R10 and a fourth voltage dividing resistor R11, a first end of the third voltage dividing resistor R10 is connected to the inductor L1 through a parallel resistor, and is connected to the capacitors C10, C11, and C12, a second end of the third voltage dividing resistor R10 is connected to a first end of the fourth voltage dividing resistor R11, and a second end of the fourth resistor R11 is grounded.
In one embodiment of the present invention, the voltage-reducing chip 20 is an MP9928-C758 chip. The utility model discloses voltage U1 that direct current high voltage input step-down converting circuit exported is 0.8 ═ 0.8 (1+ R10/R11) V.
The utility model discloses circuit part is small in quantity, and it is little to occupy the PCB board space, and is with low costs. The voltage reduction conversion requirement that input voltage is 4-60V can be met, the resistance of the divider resistor can be modified to adjust output voltage and switching frequency, the circuit is strong in universality and wide in application, the circuit can be widely popularized as an industry standard circuit, the number of circuit parts is small, the occupied PCB space is small, and the part material cost is low.
The utility model discloses an in one of them embodiment, still include overvoltage protection circuit, guarantee mainboard safety work, simultaneously, still can include overcurrent protection and excess temperature protection circuit, and when the electric current of circuit was greater than the default, the control circuit disconnection prevented that the electric current of flowing in the control panel is too big, burns out the mainboard, and temperature sensor detection circuitry's temperature when the temperature is too high, and the control circuit disconnection prevents that the main control board temperature is too high, can effectively guarantee that circuit conversion efficiency is high.
The utility model also provides a terminal device, including a circuit board, be provided with on the circuit board as above each embodiment direct current high voltage input step-down converting circuit for the circuit board power supply after stepping down direct current high voltage. The terminal equipment comprises a terminal device, a mobile terminal device such as a mobile phone and other non-mobile terminal devices.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. The utility model provides a direct current high voltage input step-down converting circuit, its characterized in that, includes the step-down chip, the first voltage division module of being connected with the step-down chip, switch circuit, filter circuit and second voltage division module, and the enable end of step-down chip is connected to first voltage division module, and the step-down chip is connected to switch circuit's input, switch circuit includes MOSFET pipe switch circuit, and step-down chip output level signal control MOSFET pipe switch circuit switches on and cuts off, and filter circuit's input is connected to switch circuit's output, and second voltage division module is connected to filter circuit's output, exports stable voltage U1 after the step-down of second voltage division module.
2. The dc high voltage input buck conversion circuit according to claim 1, wherein the first voltage-dividing module includes a first voltage-dividing resistor and a second voltage-dividing resistor, a first end of the first voltage-dividing resistor is connected to an external power source, a second end of the first voltage-dividing resistor is connected to a first end of the second voltage-dividing resistor and a power input end of the buck chip, and a second end of the second voltage-dividing resistor is grounded.
3. The direct-current high-voltage input buck conversion circuit according to claim 1, wherein the MOSFET switching circuit comprises a first MOSFET and a second MOSFET, a first end of the first MOSFET is connected to the TG terminal of the buck chip, a second end of the first MOSFET is connected to an external power supply, a third end of the first MOSFET is connected to a second end of the second MOSFET, a second end of the second MOSFET is further connected to the filter circuit, and a first end of the second MOSFET is connected to the BG terminal of the buck chip.
4. The dc high voltage input buck converter circuit of claim 1, wherein the filter circuit comprises a filter inductor.
5. The DC high-voltage input buck conversion circuit according to claim 1, further comprising a filter capacitor, wherein the filter capacitor is connected to the second voltage division module.
6. The DC high-voltage input buck conversion circuit according to claim 5, wherein the second voltage-dividing module includes a third voltage-dividing resistor and a fourth voltage-dividing resistor, a first end of the third voltage-dividing resistor is connected to the inductor and the filter capacitor, respectively, a second end of the third voltage-dividing resistor is connected to a first end of the fourth voltage-dividing resistor, and a second end of the fourth resistor is grounded.
7. The dc high voltage input buck converter circuit according to claim 6, wherein the voltage U1 is 0.8 × V (1+ third voltage dividing resistor/fourth voltage dividing resistor).
8. The DC high-voltage input buck conversion circuit according to claim 1, wherein the buck chip is an MP9928-C758 chip.
9. A terminal device comprising a circuit board, wherein the circuit board is provided with the dc high voltage input buck conversion circuit according to any one of claims 1 to 8, and is used for supplying power to the circuit board after the dc high voltage is stepped down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022732255.0U CN214014111U (en) | 2020-11-24 | 2020-11-24 | Direct-current high-voltage input step-down conversion circuit and terminal device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022732255.0U CN214014111U (en) | 2020-11-24 | 2020-11-24 | Direct-current high-voltage input step-down conversion circuit and terminal device |
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| CN214014111U true CN214014111U (en) | 2021-08-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114448247A (en) * | 2021-12-27 | 2022-05-06 | 深圳微步信息股份有限公司 | VCCSA voltage output control circuit |
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- 2020-11-24 CN CN202022732255.0U patent/CN214014111U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114448247A (en) * | 2021-12-27 | 2022-05-06 | 深圳微步信息股份有限公司 | VCCSA voltage output control circuit |
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