CN211405864U - Multichannel high withstand voltage MCU power supply reset circuit - Google Patents
Multichannel high withstand voltage MCU power supply reset circuit Download PDFInfo
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- CN211405864U CN211405864U CN202020305877.2U CN202020305877U CN211405864U CN 211405864 U CN211405864 U CN 211405864U CN 202020305877 U CN202020305877 U CN 202020305877U CN 211405864 U CN211405864 U CN 211405864U
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Abstract
The utility model discloses a multichannel high withstand voltage MCU power supply reset circuit, which is characterized by comprising a multichannel power supply module, a first-stage voltage reduction module and a second-stage voltage reduction and reset module, wherein the second-stage voltage reduction and reset module comprises a second-stage voltage reduction circuit and an external enabling reset circuit; the output of the multi-channel power supply module is connected to the input end of a first-stage voltage reduction module, and the output of the first-stage voltage reduction module is connected to the input end of a second-stage voltage reduction circuit; the output end of the second-stage voltage reduction circuit is connected to the power supply input end of the MCU; the output end of the external enabling reset circuit is connected to the reset input end of the MCU, and the input end of the external enabling reset circuit is connected to the reset instruction of the MCU. The utility model discloses can overcome current MCU supply circuit's defect, it is high to have the reliability of power supply again, avoids the advantage of circuit reset hardware damage.
Description
Technical Field
The utility model belongs to the technical field of electronic circuit, specifically be a multichannel high withstand voltage MCU power supply reset circuit.
Background
The conventional MCU power supply circuit includes a Low Dropout Regulator (Low LDO) for supplying power to the MCU and a DC/DC (direct current conversion) mode for supplying power to the MCU, both of which have some drawbacks.
The defect that a high-voltage LDO is used for supplying power to an MCU: the LDOs commonly used in the market at present are 30V voltage platforms, the high-voltage platforms are few, the output current of the LDOs of the high-voltage platforms is small, the cost is high, and almost no LDOs with the input voltage exceeding 100V exist.
The DC/DC mode is a defect of supplying power to the MCU: the standby power consumption is large, the input voltage is generally within 100V, the ripple is large, the anti-interference capability is poor, the EMC passing performance is poor, and the cost is high.
Therefore, the conventional technical scheme has the problems of low input voltage, large ripple, poor interference resistance, poor electromagnetic Compatibility (EMC) trafficability and high cost.
Meanwhile, the existing MCU power supply technical scheme has other defects, for example, a single channel is selected for power supply, when the power supply of the single channel is broken to cause abnormal power supply, the singlechip cannot normally work, and the power supply reliability is poor.
In addition, the traditional MCU is powered and reset, a mechanical switch is used for shifting, a shifting switch or a button is easy to damage, the mechanical switch is damaged, MCU data cannot be monitored in real time, and the reset function cannot be started in time when the data are abnormal.
Chinese patent publication No. CN207766145U discloses an MCU power supply circuit, which includes a first-stage linear voltage-dropping module and a second-stage linear voltage-dropping module, wherein the first-stage linear voltage-dropping module 100 drops an accessed power supply voltage IN + via a triode until the requirement of the second-stage linear voltage-dropping module 200 is satisfied. This patent has solved the big, poor problem of EMC trafficability characteristic of current MCU supply circuit output ripple, but has not solved the power supply and resets mechanical damage problem, and the technical scheme of this patent is the single channel power supply scheme, has the unstable problem of power supply reliability.
Disclosure of Invention
The utility model aims at the problem that prior art exists, provide a multichannel high withstand voltage MCU power supply reset circuit, this circuit can overcome current MCU power supply circuit's defect, has the reliability of power supply height again, avoids the advantage that circuit reset hardware harmed.
In order to achieve the above object, the utility model adopts the following technical scheme:
a multichannel high-voltage-resistance MCU power supply reset circuit comprises a multichannel power supply module, a first-stage voltage reduction module and a second-stage voltage reduction and reset module, wherein the second-stage voltage reduction and reset module comprises a second-stage voltage reduction circuit and an external enabling reset circuit; the output of the multi-channel power supply module is connected to the input end of a first-stage voltage reduction module, and the output of the first-stage voltage reduction module is connected to the input end of a second-stage voltage reduction circuit; the output end of the second-stage voltage reduction circuit is connected to the power supply input end of the MCU; the output end of the external enabling reset circuit is connected to the reset input end of the MCU, and the input end of the external enabling reset circuit is connected to the reset instruction of the MCU.
Preferably, the multi-channel power supply module includes three power supply channels, each power supply channel is isolated from the first-stage voltage reduction module by a diode, and each power supply channel is connected to different power supply voltages.
Preferably, the first-stage voltage reduction module includes a first zener diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a first triode, a second triode, and a third triode; one end of the first resistor is connected with the output of the multi-channel power supply module, and the other end of the first resistor is connected with the cathode of the first voltage-stabilizing diode and the base of the first triode; the anode of the first voltage stabilizing diode is connected with one end of the first capacitor and one end of the second capacitor and is grounded; the other ends of the first capacitor and the second capacitor are connected with an emitting electrode of the second triode and an emitting electrode of the third triode; one end of the second resistor is connected with the output of the multi-channel power supply module, and the other end of the second resistor is connected with the collector of the first triode; an emitter of the first triode is connected with one end of the third resistor and one end of the fourth resistor; the other end of the third resistor is connected with the base electrode of the second triode; the other end of the fourth resistor is connected with the base electrode of the third triode; one end of the fifth resistor is connected with the output of the multi-channel power supply module, and the other end of the fifth resistor is connected to the collector of the third triode through the sixth resistor; and the emitting electrode of the second triode and the emitting electrode of the third triode are sequentially connected and are connected to the second-stage voltage reduction and reset module through a seventh resistor.
Preferably, the second-stage voltage reduction circuit comprises an eighth resistor, a third capacitor, a fourth capacitor and a first LDO chip; and the output end of the first LDO chip is connected to the power supply input end of the MCU.
Preferably, the peripheral enable reset circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a fifth capacitor, a sixth capacitor, a fourth triode, a fifth triode, and a second LDO chip; the other end of the ninth resistor is connected with the cathode of the second voltage stabilizing diode, and the anode of the second voltage stabilizing diode is grounded; one end of the twelfth resistor is connected to the collector of the fourth triode through the thirteenth resistor and is connected to the base of the fifth triode simultaneously; the emitter of the fourth triode is grounded; the base electrode of the fourth triode is respectively connected with one end of the tenth resistor and one end of the eleventh resistor; the other end of the eleventh resistor is grounded; the other end of the tenth resistor is connected with a POWER-ON port; the collector of the fifth triode is grounded, and the emitter of the fifth triode is connected with the fifteenth resistor; the fifteenth resistor and the fourteenth resistor are connected and are connected with the input end of the second LDO chip; the input end of the second LDO chip is grounded through a fifth capacitor, and the output end of the second LDO chip is grounded through a sixth capacitor; and the output end of the second LDO chip is connected to the reset input end of the MCU.
Preferably, the POWER-ON port of the peripheral enable reset circuit receives a reset instruction sent by the MCU.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a two-stage step-down mode is the MCU power supply, and in first order step-down module, parallelly connected second triode and third triode, has improved the supply current load capacity after the step-down, steps down and reset die in the second season simultaneously
The MCU controls the reset function, and hardware damage caused by mechanical reset is avoided.
(2) The utility model discloses a controllable reseing is realized to external enabling reset circuit, when MCU detects that the storage data is full or the storage data is unusual, send reset instruction to enabling reset circuit's POWER-ON port, start the reset function, utilize the fourth triode, the characteristic and the resistance partial pressure characteristic of fifth triode, control second LDO chip input end voltage, and then control MCU input voltage that resets, realize the control to MCU reset function, thereby prevent the hardware damage that mechanical type reset brought, guarantee the reliability that resets, and guaranteed that MCU operation does not crash, user experience has been improved.
(3) The utility model discloses a multichannel power supply is kept apart through the diode between each passageway, and the disconnection of certain channel voltage does not influence the transmission of other channel voltage to power supply reliability and continuation have been improved.
(4) The utility model discloses an output ripple noise is close OdB, and EMC trafficability characteristic is better, and energy consumption is little, and the cost of manufacture is low, the sexual valence relative altitude.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model provides a multichannel high withstand voltage MCU power supply reset circuit, including multichannel power module, first grade step-down module and second grade step-down and reset module, second grade step-down and reset module includes second grade step-down circuit and peripheral hardware enable reset circuit; the output of the multi-channel power supply module is connected to the input end of a first-stage voltage reduction module, and the output of the first-stage voltage reduction module is connected to the input end of a second-stage voltage reduction circuit; the output end of the second-stage voltage reduction circuit is connected to the power supply input end of the MCU; the output end of the external enabling reset circuit is connected to the reset input end of the MCU, and the input end of the external enabling reset circuit is connected to the reset instruction of the MCU. The utility model discloses a circuit detects when MCU detects that the storage data is full or the storage data is unusual at MCU, MCU sends reset instruction to enable reset circuit's POWER-ON port, start reset function, peripheral hardware enables reset circuit and utilizes its fourth triode, the characteristic and the resistance partial pressure characteristic of fifth triode, control second LDO chip input end voltage, and then the input voltage of control MCU reset input end, the realization is to MCU reset function's control, thereby prevent the hardware damage that mechanical type reset brought, the reliability of resetting has been guaranteed.
Specifically, as shown in fig. 1, the multi-channel power supply module includes a channel 1, a channel 2, and a channel 3, the channel 1, the channel 2, and the channel 3 are respectively connected to different power supply voltages, and the channel 1, the channel 2, and the channel 3 are respectively isolated from the first-stage buck module by a diode D1, a diode D2, and a diode D3, and do not affect each other. The disconnection of the voltage of a certain channel does not affect the transmission of the power supply voltages of other channels, so that the power supply of multiple channels is adopted, the reliability and the continuity of the power supply are improved, and the terminal can be ensured to operate without power failure.
The first-stage voltage reduction module comprises a first voltage stabilizing diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a first triode, a second triode and a third triode. One end of the first resistor R1 is connected with the output of the multi-channel power supply module, and the other end is connected with the cathode of the first voltage-stabilizing diode ZD1 and the base of the first triode Q1; the anode of the first zener diode ZD1 is connected to one end of the first capacitor C1 and one end of the second capacitor C2 and is connected to the ground; the other ends of the first capacitor C1 and the second capacitor C2 are connected with an emitter of a second triode Q2 and an emitter of a third triode Q3; one end of the second resistor R2 is connected with the output of the multi-channel power supply module, and the other end of the second resistor R2 is connected with the collector of the first triode Q1; an emitter of the first triode Q1 is connected with one end of the third resistor R3 and one end of the fourth resistor R4; the other end of the third resistor R3 is connected with the base of a second triode Q2; the other end of the fourth resistor R4 is connected with the base of a third triode Q3; one end of the fifth resistor R5 is connected with the output of the multi-channel power supply module, and the other end is connected to the collector of the third triode Q3 through the sixth resistor R6; and an emitting electrode of the second triode Q2 and an emitting electrode of the third triode Q3 are sequentially connected and are connected to the second-stage voltage reduction and reset module through a seventh resistor R7. The second triode Q2 and the third triode Q3 are connected in parallel, and the load capacity of the supply current after voltage reduction is improved.
The second-stage voltage reduction circuit is connected to an output signal of the first-stage voltage reduction module, and the output signal is connected to a power supply input end of the MCU through an eighth resistor R8 and a first LDO chip IC 1; meanwhile, the input end of the first LDO chip is grounded through the third capacitor C3, and the output end thereof is grounded through the fourth capacitor C4. The LDO voltage with high precision and low power consumption is used, and the requirement of the singlechip on the working voltage with high precision and low ripple can be met.
The utility model discloses a two-stage step-down mode, the triode step-down is used to the first order, and the triode step-down of optional high VCE voltage can satisfy the operation requirement of high-pressure input, and is general, and the VCE voltage of ordinary triode all is more than 100V to first order step-down can make the high pressure reduce to within 30V, in order to satisfy second grade low pressure LDO's input voltage operation requirement. The technical scheme can bear the use requirement of the input voltage of more than 100V, and the primary voltage reduction prepares sufficient load current for the secondary voltage reduction, so that the use requirement of the singlechip is met; the secondary voltage reduction can enable the precision of the output voltage to reach 1% precision and ripple waves +/-1 mV, and the use requirement of the single chip microcomputer is met. The whole loop adopts a low-power-consumption voltage reduction loop, and the power consumption of the whole loop is not more than 0.01 milliampere in an output no-load state; the first-stage voltage reduction and the second-stage voltage reduction both adopt a linear voltage reduction mode, so that the output ripple noise is close to OdB, and the EMC (electro magnetic compatibility) is better; and a two-stage voltage reduction mode is adopted, so that the filtering capability is strong, and the input power supply surge resistance is stronger.
In the peripheral enabling reset circuit, an output signal of the first-stage voltage reduction module is connected to an anode of the diode D4, and a cathode of the diode D4 is connected to one end of the ninth resistor R9, one end of the twelfth resistor R12 and one end of the fourteenth resistor R14 respectively. The other end of the ninth resistor R9 is connected to the cathode of the second zener diode ZD2, and the anode of the second zener diode ZD2 is grounded. Twelfth resistor R12
The collector of the Q4 is connected to the base of the fifth triode Q5. The emitter of the fourth triode Q4 is grounded; the base electrode of the fourth triode Q4 is respectively connected with one end of a tenth resistor R10 and one end of an eleventh resistor R11; the other end of the eleventh resistor R11 is grounded; the other end of the tenth resistor is connected with a POWER-ON port. The collector of the fifth triode Q5 is grounded, and the emitter is connected to the fifteenth resistor. And the fifteenth resistor R15 and the fourteenth resistor R14 are connected with each other and are connected with the input end of the second LDO chip. The input end of the second LDO chip is grounded through a capacitor C5, and the output end of the second LDO chip is grounded through a capacitor C6; the output end of the second LDO chip IC2 is connected to the reset input end of the MCU.
The utility model discloses a controllable resetting of peripheral hardware, its storage data of MCU real-time supervision, when detecting that storage data is full or unusual, send reset instruction and give the POWER-ON port of peripheral hardware enabling reset circuit, start the reset function, prevent that the mechanical type is compound.
Claims (6)
1. A multichannel high-voltage-resistance MCU power supply reset circuit is characterized by comprising a multichannel power supply module, a first-stage voltage reduction module and a second-stage voltage reduction and reset module, wherein the second-stage voltage reduction and reset module comprises a second-stage voltage reduction circuit and an external enable reset circuit; the output of the multi-channel power supply module is connected to the input end of a first-stage voltage reduction module, and the output of the first-stage voltage reduction module is connected to the input end of a second-stage voltage reduction circuit; the output end of the second-stage voltage reduction circuit is connected to the power supply input end of the MCU; the output end of the external enabling reset circuit is connected to the reset input end of the MCU, and the input end of the external enabling reset circuit is connected to the reset instruction of the MCU.
2. The multi-channel high voltage withstand MCU power supply reset circuit according to claim 1, wherein the multi-channel power supply module comprises three power supply channels, each power supply channel is isolated from the first-stage buck module by a diode, and each power supply channel is connected to a different power supply voltage.
3. The multi-channel high voltage withstand MCU power supply reset circuit according to claim 1, wherein the first-stage buck module comprises a first zener diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a first triode, a second triode and a third triode; one end of the first resistor is connected with the output of the multi-channel power supply module, and the other end of the first resistor is connected with the cathode of the first voltage-stabilizing diode and the base of the first triode; the anode of the first voltage stabilizing diode is connected with one end of the first capacitor and one end of the second capacitor and is grounded; the other ends of the first capacitor and the second capacitor are connected with an emitting electrode of the second triode and an emitting electrode of the third triode; one end of the second resistor is connected with the output of the multi-channel power supply module, and the other end of the second resistor is connected with the collector of the first triode; an emitter of the first triode is connected with one end of the third resistor and one end of the fourth resistor; the other end of the third resistor is connected with the base electrode of the second triode; the other end of the fourth resistor is connected with the base electrode of the third triode; one end of the fifth resistor is connected with the output of the multi-channel power supply module, and the other end of the fifth resistor is connected to the collector of the third triode through the sixth resistor; and the emitting electrode of the second triode and the emitting electrode of the third triode are sequentially connected and are connected to the second-stage voltage reduction and reset module through a seventh resistor.
4. The multi-channel high voltage withstand MCU power supply reset circuit of claim 1, wherein the second-stage voltage reduction circuit comprises an eighth resistor, a third capacitor, a fourth capacitor and a first LDO chip; and the output end of the first LDO chip is connected to the power supply input end of the MCU.
5. The multi-channel high voltage withstand MCU power supply reset circuit of claim 1, wherein the peripheral enable reset circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a fifth capacitor, a sixth capacitor, a fourth triode, a fifth triode and a second LDO chip; the other end of the ninth resistor is connected with the cathode of the second voltage stabilizing diode, and the anode of the second voltage stabilizing diode is grounded; one end of the twelfth resistor is connected to the collector of the fourth triode through the thirteenth resistor and is connected to the base of the fifth triode simultaneously; the emitter of the fourth triode is grounded; the base electrode of the fourth triode is respectively connected with one end of the tenth resistor and one end of the eleventh resistor; the other end of the eleventh resistor is grounded; the other end of the tenth resistor is connected with a POWER-ON port; the collector of the fifth triode is grounded, and the emitter of the fifth triode is connected with the fifteenth resistor; the fifteenth resistor and the fourteenth resistor are connected and are connected with the input end of the second LDO chip; the input end of the second LDO chip is grounded through a fifth capacitor, and the output end of the second LDO chip is grounded through a sixth capacitor; and the output end of the second LDO chip is connected to the reset input end of the MCU.
6. The multi-channel high voltage withstand MCU POWER supply reset circuit of claim 1, wherein a POWER-ON port of the peripheral enable reset circuit receives a reset instruction sent by an MCU.
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| CN202020305877.2U CN211405864U (en) | 2020-03-12 | 2020-03-12 | Multichannel high withstand voltage MCU power supply reset circuit |
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| CN202020305877.2U CN211405864U (en) | 2020-03-12 | 2020-03-12 | Multichannel high withstand voltage MCU power supply reset circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112631357A (en) * | 2020-12-22 | 2021-04-09 | 博科能源系统(深圳)有限公司 | DC voltage-stabilized power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112631357A (en) * | 2020-12-22 | 2021-04-09 | 博科能源系统(深圳)有限公司 | DC voltage-stabilized power supply circuit |
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Effective date of registration: 20220510 Address after: 201311 buildings 1 and 2, No. 333, Haiyang 1st Road, Lingang New Area, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee after: Shanghai Aoyu Hydrogen Energy Technology Co.,Ltd. Address before: 430000 South Taizi Lake innovation Valley enlightenment Xiexin science and Innovation Park f3303, Wuhan Economic and Technological Development Zone, Hubei Province Patentee before: Hubei hanruijing Automobile Intelligent System Co.,Ltd. |
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Effective date of registration: 20221101 Address after: 201311 buildings 1 and 2, No. 333, Haiyang 1st Road, Lingang New Area, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee after: Shanghai Hurichao Technology Partnership (L.P.) Address before: 201311 buildings 1 and 2, No. 333, Haiyang 1st Road, Lingang New Area, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee before: Shanghai Aoyu Hydrogen Energy Technology Co.,Ltd. |
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Effective date of registration: 20230303 Address after: 201800 room 2201 J, 888 Moyu South Road, Anting Town, Jiading District, Shanghai Patentee after: Shanghai Furui Hydrogen New Energy Technology Co.,Ltd. Address before: 201311 buildings 1 and 2, No. 333, Haiyang 1st Road, Lingang New Area, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee before: Shanghai Hurichao Technology Partnership (L.P.) |
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