CN104348130A - Equipment power supply method and equipment power supply circuit - Google Patents
Equipment power supply method and equipment power supply circuit Download PDFInfo
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- CN104348130A CN104348130A CN201310323946.7A CN201310323946A CN104348130A CN 104348130 A CN104348130 A CN 104348130A CN 201310323946 A CN201310323946 A CN 201310323946A CN 104348130 A CN104348130 A CN 104348130A
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Abstract
The invention discloses an equipment power supply method and an equipment power supply circuit. The equipment power supply circuit comprises a power supply input end, a microcontroller, a high-side switch, a switch chip power supply circuit, a switch chip control circuit and a power supply voltage sampling circuit, wherein a sampling end of the power supply voltage sampling circuit is connected with the power supply input end, and a sampling signal output end of the power supply voltage sampling circuit is connected with a first analog quantity input end of the microcontroller; an input end of the switch chip power supply circuit is connected with the power supply input end, an output end of the switch chip power supply circuit is connected with a power supply input end of the high-side switch, and a control end of the switch chip power supply circuit is connected with a second control signal output end of the microcontroller; an input end of the switch chip control circuit is connected with the second control signal output end of the microcontroller, and an output end of the switch chip control circuit is connected with a control signal input end of the high-side switch; an output end of the high-side switch is connected with a power supply output end. According to the equipment power supply method and the equipment power supply circuit disclosed by the invention, when the voltage of the power supply input end is abnormal, a power supply of the high-side switch can be cut off through the switch chip power supply circuit, thus the output of the equipment power supply circuit can be cut off, and the safety performance of the equipment power supply circuit is increased.
Description
[technical field]
The equipment of the present invention relates to is powered, and particularly relates to a kind of equipment method of supplying power to and equipment power supply circuits.
[background technology]
Traditional equipment power supply circuits do not detect the voltage of input power, and current feedback needs external equipment or takies the analog input port of equipment itself, can not cut off the electricity supply in time when output overloading, and security performance is good not.
[summary of the invention]
The technical problem to be solved in the present invention is to provide the good equipment method of supplying power to of a kind of security performance and equipment power supply circuits.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is, a kind of equipment method of supplying power to, the voltage of power input is detected, when the electric voltage exception of power input, the power supply of high side switches is cut off by switch chip power supply circuits, thus the output of the equipment of cut-out power supply circuits.
A kind of equipment power supply circuits realizing above-mentioned method of supplying power to, comprise power input, power supply output, microcontroller, high side switches, switch chip power supply circuits, switch chip control circuit and supply voltage sample circuit, the sampling termination power input of supply voltage sample circuit, the sampled signal of supply voltage sample circuit exports the first analog input end of termination microcontroller; The input termination power input of switch chip power supply circuits, exports the power input of termination high side switches, controls the second control signal output of termination microcontroller; Second control signal output of the input termination controller of switch chip control circuit, exports the control signal input of termination high side switches; The power supply output described in output termination of high side switches.
Above-described equipment power supply circuits, comprise feedback circuit, the output of the sampling termination high side switches of feedback circuit, and feedback signal output connects the second analog input end of microcontroller.
Above-described equipment power supply circuits, switch chip power supply circuits comprise relay, relay power supply and triode, between the input that the main contact of relay is serially connected in switch chip power supply circuits and output; One relay termination power supply positive pole of relay coil, the collector electrode of another termination triode; The grounded emitter of triode, base stage connects the second control signal output of microcontroller.
Above-described equipment power supply circuits, supply voltage sample circuit comprises the first sampling resistor, the second sampling resistor and the first voltage follower, after the first sampling resistor is connected with the second sampling resistor, a termination power input, other end ground connection; The tie point of the first sampling resistor and the second sampling resistor connects the input of the first voltage follower, the first analog input end of the output termination microcontroller of the first voltage follower.
Above-described equipment power supply circuits, supply voltage sample circuit comprises the first filter capacitor, the second filter capacitor and the first resistance, and the output of the first voltage follower connects the first analog input end of microcontroller by the first resistance; The input of one termination first voltage follower of the first filter capacitor, other end ground connection; First analog input end of one termination microcontroller of the second filter capacitor, other end ground connection.
Above-described equipment power supply circuits, switch chip control circuit comprises not gate, pull-up resistor, isolation resistance and the second resistance, the first control signal output of a termination controller of isolation resistance, the input of another termination not gate; One termination positive level of pull-up resistor, the input of another termination not gate; The output of not gate connects the control signal input of high side switches by the second resistance.
Above-described equipment power supply circuits, feedback circuit comprises current sampling resistor, difference amplifier and the second voltage follower, and the output of high side switches connects the output of equipment power supply circuits by current sampling resistor; The first input end of difference amplifier connects the first end of current sampling resistor, the second end of the second input termination current sampling resistor of difference amplifier; The input of output termination second voltage follower of difference amplifier, the second analog input end of the output termination microcontroller of the second voltage follower.
Above-described equipment power supply circuits, feedback circuit comprises the 3rd filter capacitor, the 4th filter capacitor, the 3rd resistance and the 3rd resistance, the output of difference amplifier connects the input of the second voltage follower by the 3rd resistance, the output of the second voltage follower connects the first analog input end of microcontroller by the 4th resistance; The input of one termination second voltage follower of the 3rd filter capacitor, other end ground connection; Second analog input end of one termination microcontroller of the 4th filter capacitor, other end ground connection.
Above-described equipment power supply circuits, described high side switches is mains switch chip.
Present device power supply circuits, when the electric voltage exception of power input, cut off the power supply of high side switches by switch chip power supply circuits, thus the output of the equipment of cut-out power supply circuits, improve the security performance of equipment power supply circuits.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the schematic diagram of present device power supply circuits embodiment.
Fig. 2 is the circuit diagram of present device power supply circuits embodiment.
[embodiment]
Embodiment of the present invention equipment power supply circuits as depicted in figs. 1 and 2, comprise power input, microcontroller (CPU), mains switch chip VN920D, switch chip power supply circuits, switch chip control circuit, feedback circuit and supply voltage sample circuit, the sampling termination power input SUPPLY_DC of supply voltage sample circuit, the sampled signal of supply voltage sample circuit exports the first analog input end of termination microcontroller; The input termination power input of switch chip power supply circuits, exports the power input of termination mains switch chip VN920D, controls the second control signal output of termination microcontroller; Second control signal output of the input termination controller of switch chip control circuit, exports the control signal input of termination mains switch chip VN920D; The output of the output head joint equipment power supply circuits of mains switch chip VN920D.The output of the sampling termination mains switch chip VN920D of feedback circuit, feedback signal output connects the second analog input end of microcontroller.CPU can adopt the TMS570 Series of MCU of TI company.
The main contact that switch chip power supply circuits comprise relay R EY1, relay power supply VCC_+12V and triode Q1, relay R EY1 is serially connected between the input SUPPLY_DC of switch chip power supply circuits and output SUPPLY_DC_OUT; One relay termination power supply VCC_+12V positive pole of relay R EY1 coil, the collector electrode of another termination triode Q1; The grounded emitter of triode Q1, the base stage of triode Q1 meets the second control signal output CPU_IO_2 of microcontroller.The output SUPPLY_DC_OUT of switch chip power supply circuits meets the power input VCC of mains switch chip VN920D.
Supply voltage sample circuit comprises sampling resistor R11, sampling resistor R10, the first voltage follower, filter capacitor C5, filter capacitor C9 and resistance R12, after sampling resistor R11 connects with sampling resistor R10, one termination power input SUPPLY_DC, other end ground connection; The tie point of sampling resistor R11 and sampling resistor R10 connects the input of voltage follower U3A, and the output of voltage follower U3A meets the first analog input end CPU_ADIN2 of microcontroller by resistance R12; The input of one termination first voltage follower of filter capacitor C5, other end ground connection; First analog input end CPU_ADIN2 of the one termination microcontroller of filter capacitor C9, other end ground connection.
Switch chip control circuit comprises not gate U4, pull-up resistor R7, isolation resistance R4 and resistance R3, the first control signal output CPU_IO_1 of a termination controller of isolation resistance R4, the input of another termination not gate U4; The one termination positive level VCC_3.3V of pull-up resistor R9, the input of another termination not gate U4; The output of not gate U4 meets the control signal input INPUT of mains switch chip VN920D by resistance R3.
Feedback circuit comprises current sampling resistor R8, difference amplifier AD8206, voltage follower U3B, filter capacitor C2, filter capacitor C3, resistance R5 and resistance R6, and the output OUTPUT of mains switch chip VN920D meets the output Y00 of equipment power supply circuits by current sampling resistor R8; First input end+the IN of difference amplifier AD8206 connects the first end of current sampling resistor R8, and the second input-IN of difference amplifier AD8206 connects second end of current sampling resistor R8; The output OUT of difference amplifier AD8206 connects the input of voltage follower U3B by resistance R5, the output of voltage follower U3B meets the second analog input end CPU_ADIN1 of microcontroller by resistance R.The input of the one termination voltage follower U3B of filter capacitor C2, other end ground connection; Second analog input end CPU_ADIN1 of the one termination microcontroller of filter capacitor C3, other end ground connection.
When power input SUPPLY_DC terminal meets 24V, sampling resistor R11, R10 carry out dividing potential drop to voltage, voltage follower is formed by resistance R12 by U3A, the AD pin entering CPU after the filter that electric capacity C9 forms carries out analog acquisition, detects this voltage whether in the voltage range that product allows.If in allowed band, CPU pin CPU_IO_2 exports as high level, make triode Q1 conducting, thus relay R EY1 normally opened contact is closed, to mains switch chip U2(VN920D) power supply, as the electric voltage exception of power input SUPPLY_DC, CPU pin CPU_IO_2 output low level; When detecting that the voltage of power input SUPPLY_DC is normal, CPU pin CPU_IO_1 output low level, after not gate U4 is anti-phase, make high side switches U2 conducting, the output Y00 of power supply circuits exports to load supplying, now output current flows through sampling resistor R8, then is sampled by the analog input end entering CPU after difference amplifier and the low pass filter that is made up of amplifier, thus forms the closed-loop control exported load.
Claims (10)
1. an equipment method of supplying power to, is characterized in that, detects the voltage of power input, when the electric voltage exception of power input, is cut off the power supply of high side switches by switch chip power supply circuits, thus the output of the equipment of cut-out power supply circuits.
2. one kind realizes the equipment power supply circuits of method according to claim 1, it is characterized in that, comprise power input, power supply output, microcontroller, high side switches, switch chip power supply circuits, switch chip control circuit and supply voltage sample circuit, the sampling termination power input of supply voltage sample circuit, the sampled signal of supply voltage sample circuit exports the first analog input end of termination microcontroller; The input termination power input of switch chip power supply circuits, exports the power input of termination high side switches, controls the second control signal output of termination microcontroller; Second control signal output of the input termination controller of switch chip control circuit, exports the control signal input of termination high side switches; The power supply output described in output termination of high side switches.
3. equipment power supply circuits according to claim 2, is characterized in that, comprise feedback circuit, the output of the sampling termination high side switches of feedback circuit, and feedback signal output connects the second analog input end of microcontroller.
4. equipment power supply circuits according to claim 2, is characterized in that, switch chip power supply circuits comprise relay, relay power supply and triode, between the input that the main contact of relay is serially connected in switch chip power supply circuits and output; One relay termination power supply positive pole of relay coil, the collector electrode of another termination triode; The grounded emitter of triode, base stage connects the second control signal output of microcontroller.
5. equipment power supply circuits according to claim 2, it is characterized in that, supply voltage sample circuit comprises the first sampling resistor, the second sampling resistor and the first voltage follower, after the first sampling resistor is connected with the second sampling resistor, one termination power input, other end ground connection; The tie point of the first sampling resistor and the second sampling resistor connects the input of the first voltage follower, the first analog input end of the output termination microcontroller of the first voltage follower.
6. equipment power supply circuits according to claim 5, it is characterized in that, supply voltage sample circuit comprises the first filter capacitor, the second filter capacitor and the first resistance, and the output of the first voltage follower connects the first analog input end of microcontroller by the first resistance; The input of one termination first voltage follower of the first filter capacitor, other end ground connection; First analog input end of one termination microcontroller of the second filter capacitor, other end ground connection.
7. equipment power supply circuits according to claim 2, it is characterized in that, switch chip control circuit comprises not gate, pull-up resistor, isolation resistance and the second resistance, the first control signal output of a termination controller of isolation resistance, the input of another termination not gate; One termination positive level of pull-up resistor, the input of another termination not gate; The output of not gate connects the control signal input of high side switches by the second resistance.
8. equipment power supply circuits according to claim 2, is characterized in that, feedback circuit comprises current sampling resistor, difference amplifier and the second voltage follower, and the output of high side switches connects the output of equipment power supply circuits by current sampling resistor; The first input end of difference amplifier connects the first end of current sampling resistor, the second end of the second input termination current sampling resistor of difference amplifier; The input of output termination second voltage follower of difference amplifier, the second analog input end of the output termination microcontroller of the second voltage follower.
9. equipment power supply circuits according to claim 8, it is characterized in that, feedback circuit comprises the 3rd filter capacitor, the 4th filter capacitor, the 3rd resistance and the 3rd resistance, the output of difference amplifier connects the input of the second voltage follower by the 3rd resistance, the output of the second voltage follower connects the first analog input end of microcontroller by the 4th resistance; The input of one termination second voltage follower of the 3rd filter capacitor, other end ground connection; Second analog input end of one termination microcontroller of the 4th filter capacitor, other end ground connection.
10. the equipment power supply circuits according to claim arbitrary in claim 2 to 89, is characterized in that, described high side switches is mains switch chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310323946.7A CN104348130B (en) | 2013-07-29 | 2013-07-29 | A kind of equipment method of supplying power to and equipment power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310323946.7A CN104348130B (en) | 2013-07-29 | 2013-07-29 | A kind of equipment method of supplying power to and equipment power supply circuit |
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| CN104348130A true CN104348130A (en) | 2015-02-11 |
| CN104348130B CN104348130B (en) | 2017-07-11 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201307826Y (en) * | 2008-10-13 | 2009-09-09 | 深圳创维－Rgb电子有限公司 | LCD-TV power supply voltage detecting circuit |
| CN202978235U (en) * | 2012-11-30 | 2013-06-05 | 东莞市盈聚电子有限公司 | >Switch power supply high-precision overvoltage protection circuit |
| CN103218004A (en) * | 2012-01-20 | 2013-07-24 | 中国科学院电子学研究所 | Numerical-control direct-current voltage source |
| US20130335873A1 (en) * | 2012-06-18 | 2013-12-19 | Samsung Electro-Mechanics Co., Ltd. | Overvoltage protection circuit and method thereof |
-
2013
- 2013-07-29 CN CN201310323946.7A patent/CN104348130B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201307826Y (en) * | 2008-10-13 | 2009-09-09 | 深圳创维－Rgb电子有限公司 | LCD-TV power supply voltage detecting circuit |
| CN103218004A (en) * | 2012-01-20 | 2013-07-24 | 中国科学院电子学研究所 | Numerical-control direct-current voltage source |
| US20130335873A1 (en) * | 2012-06-18 | 2013-12-19 | Samsung Electro-Mechanics Co., Ltd. | Overvoltage protection circuit and method thereof |
| CN202978235U (en) * | 2012-11-30 | 2013-06-05 | 东莞市盈聚电子有限公司 | >Switch power supply high-precision overvoltage protection circuit |
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| CN104348130B (en) | 2017-07-11 |
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