CN104216494A - Single chip microcomputer controlled power grid detection and reset circuit - Google Patents
Single chip microcomputer controlled power grid detection and reset circuit Download PDFInfo
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- CN104216494A CN104216494A CN201410487805.3A CN201410487805A CN104216494A CN 104216494 A CN104216494 A CN 104216494A CN 201410487805 A CN201410487805 A CN 201410487805A CN 104216494 A CN104216494 A CN 104216494A
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Abstract
The invention relates to a single chip microcomputer controlled power grid detection and reset circuit, which is characterized by comprising a micro-control circuit, a main control circuit and an audion circuit, wherein a PA1 detection port of the micro-control circuit is connected with a 12V power supply through the main control circuit to form a power grid power on/power failure detection structure, a PA4 of the micro-control circuit is used as an output port and is externally connected with an external interruption port of a main control chip of a main control chip circuit through electrical resistance, the micro-control circuit controls an audion to switch on/off, and an output end of the audion circuit forms the reset circuit for the main control circuit; a single chip microcomputer chip PA4 port of the micro-control circuit respectively starts and stops outputting a 200HZ square wave signal according to the power on and power failure of the PA1 port, so that the main control circuit can enter a normal or power-save working mode. The single chip microcomputer controlled power grid detection and reset circuit has the beneficial effects that the circuit is simple in structure, the used components are less, and the economic benefit is increased.
Description
Technical field
The present invention relates to a kind of household appliances controller circuitry, the circuit of particularly a kind of monolithic processor controlled electrical net detect and reset.Belong to single chip application and household appliances control technology field.
Background technology
At present, in a lot of electronic product controlled by singlechip chip, electrical network power on and power down two kinds of situations under, singlechip chip respectively by electrical network and powered battery, to protect singlechip chip work.Due to the limited energy of battery, for delaying the serviceable life of battery, therefore under power-down state, singlechip chip must enter power-saving working mode, to ensure the use of battery maximum duration.Therefore, must power on to electrical network and detection of power loss produce reset signal, make single-chip microcomputer work in different modes.
In existing reset circuit, when electrical network powers on, single-chip microcomputer obtains the normal operating level higher than resetting voltage, mediate after the monolithic processor resetting port of level must be dragged down the Microsecond grade time period and uprise again, complete once normal complicated change, the initialization of such single-chip microcomputer internal hardware, normally works after just guaranteeing to power on, otherwise easily occurs deadlock phenomenon.
In prior art, utilize the method for microprocessor detect electric network power-fail to comprise: a kind of is by the sine wave of civil power 50HZ/60HZ frequency, by the range of decrease and keep wave characteristics, introduce one-chip machine port, formed external interrupt, whether single-chip microcomputer thus detection of grid has electricity.Conventional civil power range of decrease method can be divided into: the optocoupler of isolation scheme detects and the half-wave of non-isolated scheme detects.The common feature of two kinds of methods all needs the resistance step-down of high-power large resistance, has that cost is high, device redundancy is long, the defect of large three aspects of stand-by power consumption.Another kind is without the need to introducing civil power, by single-chip microcomputer by detecting low and high level, has judged whether electricity, but the defect of the poor in timeliness of this kind of method existence inspection.
Conventional reset circuit of SCM structure has two kinds, and one is made up of discrete electron device, exist circuit structure complicated stablize poor defect; Another kind is made up of Special reset chip, there is the higher defect of cost.
In conjunction with above various problems, the electrical net detect circuit needing design to make new advances and reset circuit solve above-mentioned problem.
Summary of the invention
Object of the present invention is to overcome electrical net detect and reset circuit complex structure in prior art, components and parts are many and production cost is high defect, providing the circuit of a kind of monolithic processor controlled electrical net detect and reset.There is low cost, device is few, stand-by power consumption is low and ageing high feature.
Object of the present invention can be reached by following measure:
A circuit for monolithic processor controlled electrical net detect and reset, is arranged between power circuit output end and Master control chip circuit input end, it is characterized in that: comprise micro-control circuit, main control circuit, transistor circuit and external power supply link; The PA1 detection port of micro-control circuit connects 12V power supply by main control circuit, form electrical network power on/off detection structure, the PA4 of micro-control circuit is as the external interrupt port of output port by the main control chip of the external main control chip circuit of resistance, the PA0 output port of micro-control circuit is connected to transistor circuit input end, control triode ON/cut-off, the output terminal external power supply VDD of transistor circuit, forms and controls the reset circuit of triode output to the main control singlechip chip of main control circuit; The singlechip chip PA4 port of described micro-control circuit obtains positive square-wave signal that is electric and dead electricity difference start and stop output 200HZ according to PA1 mouth, makes the main control singlechip chip of main control circuit (2) enter normal or power-saving working mode; External power supply link provides power supply VCC, VDD.
Object of the present invention can also be reached by following measure:
Further, described micro-control circuit comprises singlechip chip MCU1, electric capacity C3 and current-limiting resistance R1; 5 pin of singlechip chip MCU1 are that power input connects power supply VCC, and are connected with ground GND by electric capacity C3, form power filter electric power-feeding structure; 4 pin of MCU1 detect input end and are connected to main control circuit test side PIN INT by resistance R1; 3 pin of MCU1 are the reset signal input end PIN RESET of reset terminal by resistance R4 connecting triode circuit, and 1 pin of singlechip chip MCU1 is the interruptive port that look-at-me output terminal is connected to the main control singlechip of main control circuit; The 2 pin ground connection GND of MCU1.
Further, described main control circuit is connected and composed by main control singlechip chip MCU2, resistance R2, electric capacity C1-C2, C4, diode D1, crystal oscillator CSC1-CSC2 and battery BT1; Described main control singlechip chip MCU2 the 7th, 8 pin are that oscillation inputs connects crystal oscillator CSC1, MCU2 the 10th, 11 pin are that oscillation inputs connects crystal oscillator CSC2 and respectively by electric capacity C1, C2 ground connection, two ends of electric capacity C4 connect VDD pin, the VSS pin of MCU2 respectively, the positive pole forward of battery BT1 connects the VSS pin of MCU2 by diode D1, the negative pole of battery BT1 connects the VDD pin of MCU2 by resistance R2, the VDD pin ground connection of MCU2, the VSS pin external power supply VDD of MCU2; 9th pin of MCU2 is the reset signal output terminal of reset terminal RESET connecting triode circuit, and the 1st pin of MCU2 is the look-at-me output terminal that the middle broken ends of fractured bone connects micro-control circuit.
Further, transistor circuit is connected and composed by triode Q1, resistance R3-R4 and electric capacity C5; The base stage of triode Q1 connects the reset signal output terminal of micro-control circuit by resistance R4, the current collection of triode Q1 very reset signal output terminal connects the reset signal input end of main control circuit and meets power vd D by resistance R3, the grounded emitter of triode Q1, electric capacity C5 is connected across between the electrode of triode Q1 and collection emitter.
Further, external power supply link is made up of socket CN1, exports two-way power vd D, VCC and earth terminal GND.
Further, described triode Q1 is NPN type triode.
The present invention has following outstanding beneficial effect:
1, electrical network of the present invention is by after power circuit step-down and main control circuit dividing potential drop, and after microprocessor detect, output high level control main control chip reset simultaneously and positive square wave, to fracture in main control chip, make main control chip enter the pattern of working on power.Testing circuit and reset circuit two functions of modules are connected by the circuit that two pieces of singlechip chips form and merge realization, main control chip is made to detect efficiently, rapidly to electrical network and work, realize detecting and reset function with less components and parts, there is circuit structure simple, ageing good and cost is low beneficial effect.
2, single-chip microcomputer of the present invention is detecting that the high level exporting several milliseconds by common I/O mouth while electrical network powers on controls transistor circuit conducting, main control chip is resetted in time, thus enter fast in normal work, substantially increase stability and the security of circuit electrical net detect and reset.There is the beneficial effect that structure is simple, safe and reliable, cost is low.
3, the present invention is after microprocessor detect port voltage drops to setting value, stop exporting lower square wave, chip enters power-saving working mode, greatly improves main control chip and controls the rapidity of electrical net detect, reduces the response time, reduce the power consumption of battery and extend the serviceable life of battery.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the specific embodiment of the invention 1.
Embodiment
Below in conjunction with drawings and Examples, invention is described in further detail:
Specific embodiment 1:
With reference to Fig. 1, the monolithic processor controlled electrical net detect that the present embodiment relates to and the circuit of reset, be arranged between power circuit output end and Master control chip circuit input end, comprise micro-control circuit 1, main control circuit 2, transistor circuit 3 and external power supply link 4; The PA1 detection port of micro-control circuit 1 connects 12V power supply by main control circuit 2, form electrical network power on/off detection structure, the PA4 of micro-control circuit 1 is as the external interrupt port of output port by the main control chip of the external main control chip circuit of resistance, the PA0 output port of micro-control circuit 1 is connected to transistor circuit 3 input end, control triode ON/cut-off, the output terminal external power supply VDD of transistor circuit 3, forms and controls the reset circuit of triode output to the main control singlechip chip of main control circuit 2; The singlechip chip PA4 port of described micro-control circuit 1 obtains positive square-wave signal that is electric and dead electricity difference start and stop output 200HZ according to PA1 mouth, makes the main control singlechip chip of main control circuit 2 enter normal or power-saving working mode; External power supply link 4 provides power supply VCC, VDD.
In the present embodiment:
Described micro-control circuit 1 comprises singlechip chip MCU1, electric capacity C3 and current-limiting resistance R1; 5 pin of singlechip chip MCU1 are that power input connects power supply VCC, and are connected with ground GND by electric capacity C3, form power filter electric power-feeding structure; 4 pin of MCU1 detect input end and are connected to main control circuit 2 test side PIN INT by resistance R1; 3 pin of MCU1 are the reset signal input end PIN RESET of reset terminal by resistance R4 connecting triode circuit 3, and 1 pin of singlechip chip MCU1 is the interruptive port that look-at-me output terminal is connected to the main control singlechip of main control circuit 2; The 2 pin ground connection GND of MCU1.
Described main control circuit 2 is connected and composed by main control singlechip chip MCU2, resistance R2, electric capacity C1-C2, C4, diode D1, crystal oscillator CSC1-CSC2 and battery BT1; Described main control singlechip chip MCU2 the 7th, 8 pin are that oscillation inputs connects crystal oscillator CSC1, MCU2 the 10th, 11 pin are that oscillation inputs connects crystal oscillator CSC2 and respectively by electric capacity C1, C2 ground connection, two ends of electric capacity C4 connect VDD pin, the VSS pin of MCU2 respectively, the positive pole forward of battery BT1 connects the VSS pin of MCU2 by diode D1, the negative pole of battery BT1 connects the VDD pin of MCU2 by resistance R2, the VDD pin ground connection of MCU2, the VSS pin external power supply VDD of MCU2; 9th pin of MCU2 is the reset signal output terminal of reset terminal RESET connecting triode circuit 3, and the 1st pin of MCU2 is the look-at-me output terminal that the middle broken ends of fractured bone connects micro-control circuit 1.
Transistor circuit 3 is connected and composed by triode Q1, resistance R3-R4 and electric capacity C5; The base stage of triode Q1 connects the reset signal output terminal of micro-control circuit 1 by resistance R4, the current collection of triode Q1 very reset signal output terminal connects the reset signal input end of main control circuit 2 and meets power vd D by resistance R3, the grounded emitter of triode Q1, electric capacity C5 is connected across between the electrode of triode Q1 and collection emitter.
External power supply link 4 is made up of socket CN1, exports two-way power vd D, VCC and earth terminal GND.
Described triode Q1 is NPN type triode.
The principle of work of this circuit:
Line voltage is 12V direct current through power circuit step-down, and the vdd terminal mouth of singlechip chip MCU1 meets power supply VCC.Described 12V, VCC power supply is all obtained through power circuit step-down rectifier by electrical network.
MCU2's VDD has powered, and under electrifying condition, VDD is introduced by socket CN1, when power down, battery-powered, and oscillator ensures the normal starting of oscillation of single-chip microcomputer.
Utility grid is after power circuit step-down and rectification, and export direct current 12V, VCC and VDD power supply and power to micro-control circuit 1, main control circuit 2 and transistor circuit 3 through external power supply link 4 respectively, its course of work is as follows:
When powering on, one chip microcomputer MCU1 resets, and port PA0 produces step-down level after several milliseconds of high level, and form pulse in triode Q1 base stage, main control singlechip MCU2 resetting pin will obtain power-on reset signal, and this main control singlechip will be waken up into the pattern of working on power.MCU1 port PA1 exports positive square wave simultaneously after the power-up, guarantees that MCU2 very first time under electrical network has electric situation detects external interrupt.Hardware reset adds normal pulse detection and guarantees that MCU2 is operated in normal condition, non-power-failure state.
After power down, MCU2 is battery-powered, and MCU1 cannot work, and positive square wave exports and stops, and MCU2 can't detect positive square wave within a few tens of milliseconds, judges electric network power-fail, enters sleep pattern, ensures that battery drain is few.
The above; be only the present invention's preferably specific embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all belonged to protection scope of the present invention.
Claims (6)
1. the circuit of a monolithic processor controlled electrical net detect and reset, be arranged between power circuit output end and Master control chip circuit input end, it is characterized in that: comprise micro-control circuit (1), main control circuit (2), transistor circuit (3) and external power supply link (4), the PA1 detection port of micro-control circuit (1) connects 12V power supply by main control circuit (2), form electrical network power on/off detection structure, the PA4 of micro-control circuit (1) is as the external interrupt port of output port by the main control chip of the external main control chip circuit of resistance, the PA0 output port of micro-control circuit (1) is connected to transistor circuit (3) input end, control triode ON/cut-off, the output terminal external power supply VDD of transistor circuit (3), form and control the reset circuit of triode output to the main control singlechip chip of main control circuit (2), the singlechip chip PA4 port of described micro-control circuit (1) obtains positive square-wave signal that is electric and dead electricity difference start and stop output 200HZ according to PA1 mouth, makes the main control singlechip chip of main control circuit (2) enter normal or power-saving working mode, external power supply link (4) provides power supply VCC, VDD.
2. the circuit of a kind of monolithic processor controlled electrical net detect according to claim 1 and reset, is characterized in that: described micro-control circuit (1) comprises singlechip chip MCU1, electric capacity C3 and current-limiting resistance R1; 5 pin of singlechip chip MCU1 are that power input connects power supply VCC, and are connected with ground GND by electric capacity C3, form power filter electric power-feeding structure; 4 pin of MCU1 detect input end and are connected to main control circuit (2) test side PIN INT by resistance R1; 3 pin of MCU1 are the reset signal input end PIN RESET of reset terminal by resistance R4 connecting triode circuit (3), and 1 pin of singlechip chip MCU1 is the interruptive port that look-at-me output terminal is connected to the main control singlechip of main control circuit (2); The 2 pin ground connection GND of MCU1.
3. the circuit of a kind of monolithic processor controlled electrical net detect according to claim 1 and 2 and reset, is characterized in that: described main control circuit (2) is connected and composed by main control singlechip chip MCU2, resistance R2, electric capacity C1-C2, C4, diode D1, crystal oscillator CSC1-CSC2 and battery BT1; Described main control singlechip chip MCU2 the 7th, 8 pin are that oscillation inputs connects crystal oscillator CSC1, MCU2 the 10th, 11 pin are that oscillation inputs connects crystal oscillator CSC2 and respectively by electric capacity C1, C2 ground connection, two ends of electric capacity C4 connect VDD pin, the VSS pin of MCU2 respectively, the positive pole forward of battery BT1 connects the VSS pin of MCU2 by diode D1, the negative pole of battery BT1 connects the VDD pin of MCU2 by resistance R2, the VDD pin ground connection of MCU2, the VSS pin external power supply VDD of MCU2; 9th pin of MCU2 is the reset signal output terminal of reset terminal RESET connecting triode circuit (3), and the 1st pin of MCU2 is the look-at-me output terminal that the middle broken ends of fractured bone connects micro-control circuit (1).
4. the circuit of a kind of monolithic processor controlled electrical net detect according to claim 3 and reset, is characterized in that: transistor circuit (3) is connected and composed by triode Q1, resistance R3-R4 and electric capacity C5; The base stage of triode Q1 connects the reset signal output terminal of micro-control circuit (1) by resistance R4, the current collection of triode Q1 very reset signal output terminal connects the reset signal input end of main control circuit (2) and meets power vd D by resistance R3, the grounded emitter of triode Q1, electric capacity C5 is connected across between the electrode of triode Q1 and collection emitter.
5. the circuit of a kind of monolithic processor controlled electrical net detect according to claim 4 and reset, is characterized in that: external power supply link (4) is made up of socket CN1, exports two-way power vd D, VCC and earth terminal GND.
6. the circuit of a kind of monolithic processor controlled electrical net detect according to claim 4 and reset, is characterized in that: described triode Q1 is NPN type triode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410487805.3A CN104216494A (en) | 2014-09-22 | 2014-09-22 | Single chip microcomputer controlled power grid detection and reset circuit |
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| CN201410487805.3A CN104216494A (en) | 2014-09-22 | 2014-09-22 | Single chip microcomputer controlled power grid detection and reset circuit |
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| CN201410487805.3A Pending CN104216494A (en) | 2014-09-22 | 2014-09-22 | Single chip microcomputer controlled power grid detection and reset circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106788370A (en) * | 2017-02-07 | 2017-05-31 | 湖南国科微电子股份有限公司 | Electronic device |
| CN107357283A (en) * | 2017-07-10 | 2017-11-17 | 博耐尔汽车电气系统有限公司 | A kind of watchdog circuit for automotive air-conditioning controller |
| CN107860955A (en) * | 2017-11-03 | 2018-03-30 | 华立科技股份有限公司 | The reset circuit and ammeter of ammeter |
| CN109597701A (en) * | 2018-10-23 | 2019-04-09 | 上海移远通信技术股份有限公司 | A kind of device that communication module is restarted automatically |
| CN110244830A (en) * | 2018-09-05 | 2019-09-17 | 浙江大华技术股份有限公司 | A kind of control circuit and its control method powered on for hard disk |
| CN111752176A (en) * | 2019-03-28 | 2020-10-09 | 天津大学 | Micro-pollutant detection equipment's single chip microcomputer system |
| CN112015112A (en) * | 2019-05-31 | 2020-12-01 | 天津大学青岛海洋技术研究院 | Single chip microcomputer system for controlling underground pipe network micro-fluidic chip |
| CN115242234A (en) * | 2022-08-09 | 2022-10-25 | 山东思科赛德矿业安全工程有限公司 | Single chip microcomputer system restarting circuit and method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106788370A (en) * | 2017-02-07 | 2017-05-31 | 湖南国科微电子股份有限公司 | Electronic device |
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| CN107357283A (en) * | 2017-07-10 | 2017-11-17 | 博耐尔汽车电气系统有限公司 | A kind of watchdog circuit for automotive air-conditioning controller |
| CN107860955A (en) * | 2017-11-03 | 2018-03-30 | 华立科技股份有限公司 | The reset circuit and ammeter of ammeter |
| CN110244830A (en) * | 2018-09-05 | 2019-09-17 | 浙江大华技术股份有限公司 | A kind of control circuit and its control method powered on for hard disk |
| CN110244830B (en) * | 2018-09-05 | 2022-06-07 | 浙江大华技术股份有限公司 | Control circuit for hard disk power-on and control method thereof |
| CN109597701A (en) * | 2018-10-23 | 2019-04-09 | 上海移远通信技术股份有限公司 | A kind of device that communication module is restarted automatically |
| CN109597701B (en) * | 2018-10-23 | 2022-06-21 | 上海移远通信技术股份有限公司 | Device for automatically restarting communication module |
| CN111752176A (en) * | 2019-03-28 | 2020-10-09 | 天津大学 | Micro-pollutant detection equipment's single chip microcomputer system |
| CN112015112A (en) * | 2019-05-31 | 2020-12-01 | 天津大学青岛海洋技术研究院 | Single chip microcomputer system for controlling underground pipe network micro-fluidic chip |
| CN115242234A (en) * | 2022-08-09 | 2022-10-25 | 山东思科赛德矿业安全工程有限公司 | Single chip microcomputer system restarting circuit and method |
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