CN110687837A - Power failure detection circuit based on single chip microcomputer - Google Patents
Power failure detection circuit based on single chip microcomputer Download PDFInfo
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- CN110687837A CN110687837A CN201910816340.4A CN201910816340A CN110687837A CN 110687837 A CN110687837 A CN 110687837A CN 201910816340 A CN201910816340 A CN 201910816340A CN 110687837 A CN110687837 A CN 110687837A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
Abstract
The invention discloses a power failure detection circuit based on a single chip microcomputer. The power supply of the invention provides 6V power, and the voltage regulator U1 outputs 5V. The voltage regulator U2 outputs VCC (3.3V) for the singlechip to work. The singlechip controls the 63 rd pin of the output pin to be circularly changed from a low level state to an output high level state for 100 microseconds by taking 5 seconds as a period, and reads the voltage value of the power supply VBB after voltage division by detecting the 62 th pin of the input pin. When the power supply is powered off, the single chip sends a valve closing signal to the valve to close the valve. The circuit of the invention has simple design, saves the area of the PCB, is beneficial to the miniaturization of equipment and reduces the cost of raw materials; the detection time is short, and the power supply voltage can be detected within 5 seconds at most; the sampling time is extremely short, the overall power consumption of the equipment is reduced, and the service time of the instrument of the disposable power supply can be prolonged by 30%; the detection does not need to increase an additional standby power supply and has high detection accuracy.
Description
Technical Field
The invention belongs to the technical field of intelligent control of instruments, and relates to a power failure detection circuit based on a single chip microcomputer.
Background
Along with the development of the microprocessor and the artificial intelligence technology, the development of the instrument industry to intellectualization is achieved, namely the intelligent level of the instruments of the intelligent robot is improved, the intelligent level is improved, the speed is increased quickly, and the life of people is easier.
The working environment of an electronic instrument product is usually severe, and usually the instrument main control board is required to be capable of detecting the voltage of an external power supply in time, and meanwhile, the main control board can still perform related functional actions when the external power supply is powered off. For example: data storage, motor action, standby power supply switching and the like.
Disclosure of Invention
The invention aims to provide a power failure detection circuit based on a single chip microcomputer, aiming at the problems in the prior art.
A power failure detection circuit based on a single chip microcomputer comprises a single chip microcomputer U3, a crystal oscillator X1, a first anti-reverse connection diode D1, a second one-way diode D2, a first power supply voltage stabilizer U1, a second power supply voltage stabilizer U2, a third triode D3, a fourth triode D4, a valve driving chip U4, a first super capacitor C4, a second super capacitor C6, a first resistor R1, a second resistor R4, a third resistor R4, a fourth voltage-dividing resistor R4, a fifth voltage-dividing resistor R4, a sixth current-limiting resistor R4, a first filter capacitor C4, a second filter capacitor C4, a third filter capacitor C4, a fourth filter capacitor C4, a sixth filter capacitor C4, a seventh filter capacitor C4, an eighth filter capacitor C4, a ninth filter capacitor C4, a tenth filter capacitor C4, an eleventh filter capacitor C4, a direct-current power supply valve P4 and a P4 interface P4;
the positive electrode of the first reverse connection prevention diode D1 is connected with the 1 st pin of the power valve interface P1 and is also connected with the VBB end of the direct-current power supply, and the 2 nd pin of the power valve interface P1 is grounded; the cathode of the first anti-reverse diode D1 is connected with the No. 2 pin of the first power supply voltage stabilizer U1 and one end of a first filter capacitor C5, and the other end of the first filter capacitor C5 and the No. 1 pin of the first power supply voltage stabilizer U1 are grounded at the same time; a pin 3 of the first power supply voltage stabilizer U1 is connected with the anode of the second one-way diode D2, the anode of the first super capacitor C4 and a pin 1 of the valve driving chip U4, the cathode of the first super capacitor C4 is connected with the anode of the second super capacitor C6, and the cathode of the second super capacitor C6 is grounded; the negative electrode of the second unidirectional diode D2 is connected with the 2 nd pin of the second power supply voltage stabilizer U2, and the 1 st pin of the second power supply voltage stabilizer U2 is grounded; the 3 rd pin of the second power supply voltage stabilizer U2 is connected with the anode of the second filter capacitor C1, and the cathode of the second filter capacitor C1 is grounded; the anode of the second filter capacitor C1 is connected to one end of the third filter capacitor C2 and one end of the fourth filter capacitor C3, and the other end of the third filter capacitor C2 and the other end of the fourth filter capacitor C3 are grounded; one end of the first resistor R1 is externally connected with VCC, and the other end is connected with the 6 th pin of the single chip machine; one end of the fifth filter capacitor C7 is connected with the 6 th pin of the singlechip, and the other end is grounded; one end of a sixth filter capacitor C12 and the 1 st pin of the crystal oscillator X1 are connected with the 10 th pin of the singlechip U3, and the other end of the sixth filter capacitor C12 is grounded; one end of a seventh filter capacitor C13 and the 2 nd pin of the crystal oscillator X1 are connected with the 11 th pin of the singlechip U3; the other end of the sixth filter capacitor C12 and the other end of the seventh filter capacitor C13 are grounded together; one end of the eighth filter capacitor C9 is connected with the 1 st pin of the valve driving chip U4, and the other end is grounded; one end of the ninth filter capacitor C8 is connected with the 7 th pin and the 8 th pin of the valve driving chip U4, and the other end is grounded; one end of a tenth filter capacitor C11 is connected with the 2 nd pin of the valve driving chip U4, and the other end is connected with the 3 rd pin of the U4; the 2 nd pin of the valve driving chip U4 is connected with the 2 nd pin of the valve interface P2; the 3 rd pin of the valve driving chip U4 is connected with the 1 st pin of the valve interface P2; the 5 th pin of the valve driving chip U4 is connected with the 4 th pin of the singlechip U3; the 6 th pin of the valve driving chip U4 is connected with the 3 rd pin of the singlechip U3; one end of the current limiting resistor R9 is connected with the 63 rd pin of the singlechip U3, and the other end is connected with the 1 st pin of the triode D4; the 2 nd pin of the triode D4 is connected with one end of a pull-up resistor R4 and one end of a current-limiting resistor R5, and the other end of the pull-up resistor R4 is connected with the anode of the power supply; the other end of the current-limiting resistor R5 is connected with the 3 rd pin of the triode D3; pin 3 of transistor D4 is grounded; the 1 st pin of the triode D3 is connected with the positive electrode of the power supply, the 2 nd pin of the triode D3 is connected with one end of a voltage division resistor R6, and the other end of the voltage division resistor R6 is connected with one end of a voltage division resistor R8 and the 62 nd pin of the singlechip U3; the other pin of the divider resistor R8 is grounded; one end of an eleventh filter capacitor C14 is connected with the 62 nd pin of the singlechip U3, and the other end of the eleventh filter capacitor C14 is grounded; the 13 th pin of the singlechip U3 is grounded; the 14 th pin of the singlechip is externally connected with VCC.
The singlechip U3 adopts a chip with the model of R7F0C 019.
The invention has the following beneficial effects:
the circuit of the invention has simple design, saves the area of the PCB, is beneficial to the miniaturization of equipment and reduces the cost of raw materials; the detection interval is long, the power supply voltage is detected every 5 seconds, the sampling time is extremely short, the overall power consumption of the equipment is reduced, and the service time of the instrument of the disposable power supply can be prolonged by 30%; the detection does not need to increase an additional standby power supply and has high detection accuracy.
Drawings
FIG. 1 is a circuit diagram of a power-down detection circuit based on a single chip microcomputer;
FIG. 2 is a schematic diagram of the level state of the control pin in the circuit;
FIG. 3 is a schematic diagram of a pin level detection state in the circuit;
Detailed Description
In order to explain technical contents, structural features, and effects of the present invention in detail, the following detailed description is made with reference to the accompanying drawings in conjunction with the embodiments.
As shown in fig. 1, a power failure detection circuit based on a single chip microcomputer includes a single chip microcomputer U3, a crystal oscillator X1, a first anti-reverse connection diode D1, a second unidirectional diode D2, a first power supply regulator U1, a second power supply regulator U2, a third triode D3, a fourth triode D4, a valve driving chip U4, a first super capacitor C4, a second super capacitor C6, a first resistor R1, a second resistor R4, a third resistor R4, a fourth voltage-dividing resistor R4, a fifth voltage-dividing resistor R4, a sixth current-limiting resistor R4, a first filter capacitor C4, a second filter capacitor C4, a third filter capacitor C4, a fourth filter capacitor C4, a sixth filter capacitor C4, a seventh filter capacitor C4, an eighth filter capacitor C4, a ninth filter capacitor C4, a tenth filter capacitor C4, an eleventh filter capacitor C4, a power supply C4, a valve P4, and a power supply P interface P4;
the positive electrode of the first reverse connection prevention diode D1 is connected with the 1 st pin of the power valve interface P1 and is also connected with the VBB end of the direct-current power supply, and the 2 nd pin of the power valve interface P1 is grounded; the cathode of the first anti-reverse diode D1 is connected with the No. 2 pin of the first power supply voltage stabilizer U1 and one end of a first filter capacitor C5, and the other end of the first filter capacitor C5 and the No. 1 pin of the first power supply voltage stabilizer U1 are grounded at the same time; a pin 3 of the first power supply voltage stabilizer U1 is connected with the anode of the second one-way diode D2, the anode of the first super capacitor C4 and a pin 1 of the valve driving chip U4, the cathode of the first super capacitor C4 is connected with the anode of the second super capacitor C6, and the cathode of the second super capacitor C6 is grounded; the negative electrode of the second unidirectional diode D2 is connected with the 2 nd pin of the second power supply voltage stabilizer U2, and the 1 st pin of the second power supply voltage stabilizer U2 is grounded; the 3 rd pin of the second power supply voltage stabilizer U2 is connected with the anode of the second filter capacitor C1, and the cathode of the second filter capacitor C1 is grounded; the anode of the second filter capacitor C1 is connected to one end of the third filter capacitor C2 and one end of the fourth filter capacitor C3, and the other end of the third filter capacitor C2 and the other end of the fourth filter capacitor C3 are grounded; one end of the first resistor R1 is externally connected with VCC, and the other end is connected with the 6 th pin of the single chip machine; one end of the fifth filter capacitor C7 is connected with the 6 th pin of the singlechip, and the other end is grounded; one end of a sixth filter capacitor C12 and the 1 st pin of the crystal oscillator X1 are connected with the 10 th pin of the singlechip U3, and the other end of the sixth filter capacitor C12 is grounded; one end of a seventh filter capacitor C13 and the 2 nd pin of the crystal oscillator X1 are connected with the 11 th pin of the singlechip U3; the other end of the sixth filter capacitor C12 and the other end of the seventh filter capacitor C13 are grounded together; one end of the eighth filter capacitor C9 is connected with the 1 st pin of the valve driving chip U4, and the other end is grounded; one end of the ninth filter capacitor C8 is connected with the 7 th pin and the 8 th pin of the valve driving chip U4, and the other end is grounded; one end of a tenth filter capacitor C11 is connected with the 2 nd pin of the valve driving chip U4, and the other end is connected with the 3 rd pin of the U4; the 2 nd pin of the valve driving chip U4 is connected with the 2 nd pin of the valve interface P2; the 3 rd pin of the valve driving chip U4 is connected with the 1 st pin of the valve interface P2; the 5 th pin of the valve driving chip U4 is connected with the 4 th pin of the singlechip U3; the 6 th pin of the valve driving chip U4 is connected with the 3 rd pin of the singlechip U3; one end of the current limiting resistor R9 is connected with the 63 rd pin of the singlechip U3, and the other end is connected with the 1 st pin of the triode D4; the 2 nd pin of the triode D4 is connected with one end of a pull-up resistor R4 and one end of a current-limiting resistor R5, and the other end of the pull-up resistor R4 is connected with the anode of the power supply; the other end of the current-limiting resistor R5 is connected with the 3 rd pin of the triode D3; pin 3 of transistor D4 is grounded; the 1 st pin of the triode D3 is connected with the positive electrode of the power supply, the 2 nd pin of the triode D3 is connected with one end of a voltage division resistor R6, and the other end of the voltage division resistor R6 is connected with one end of a voltage division resistor R8 and the 62 nd pin of the singlechip U3; the other pin of the divider resistor R8 is grounded; one end of an eleventh filter capacitor C14 is connected with the 62 nd pin of the singlechip U3, and the other end of the eleventh filter capacitor C14 is grounded; the 13 th pin of the singlechip U3 is grounded; the 14 th pin of the singlechip is externally connected with VCC.
The singlechip U3 adopts a chip with the model of R7F0C 019; the first power voltage stabilizer U1 and the second power voltage stabilizer U2 are S-1206B33-U3T 1G; the valve driver chip U4 is DRV8837 DSGR.
As shown in fig. 2 and 3, the working process of the present invention is as follows:
the working process is as follows: a 6V power supply is provided at the VBB end of the direct-current power supply, 5V is output through the first voltage stabilizer chip U1 to charge the first super capacitor C4 and the second super capacitor C6, and VCC (3.3V) is output through the second voltage stabilizer chip U2 to supply power to the singlechip U3; after the single chip microcomputer starts to work, a pin 63 of the single chip microcomputer outputs a high level once every 5 seconds to enable the fourth triode D4 to be conducted, so that the base voltage of the third triode D3 is pulled low, the third triode D3 is conducted, the power voltage is divided to a pin 62 of the single chip microcomputer U3 through the third triode D3, the fourth voltage dividing resistor R6 and the fifth voltage dividing resistor R8, and the single chip microcomputer detects the voltage.
When the power supply valve interface P1 is powered off, the electricity stored in the first super capacitor C4 and the second super capacitor C6 cannot reach a direct-current power supply because the first anti-reverse connection diode D1 is not connected with the direct-current power supply, so that the VBB voltage is 0V, the single chip microcomputer can continuously work by using the residual electricity of the super capacitors, when the voltage detected by the 62 th pin of the detection pin of the single chip microcomputer is 0V, the power supply power failure is detected by the single chip microcomputer U3, the single chip microcomputer U3 sends valve closing signals to the 5 th pin and the 6 th pin of the valve driving chip U4 through the 3 rd pin and the 4 th pin, the valve driving chip U4 sends a valve closing instruction to the valve interface P2 through the 2 nd pin and the 3 rd pin of the single chip microcomputer U3 after receiving the valve closing signal, and the valve interface P2 performs valve closing operation by using the residual electricity of the super.
Claims (2)
1. A power failure detection circuit based on a single chip microcomputer is characterized by comprising a single chip microcomputer U3, a crystal oscillator X1, a first anti-reverse connection diode D1, a second one-way diode D2, a first power supply voltage stabilizer U1, a second power supply voltage stabilizer U2, a third triode D3, a fourth triode D4, a valve driving chip U4, a first super capacitor C4, a second super capacitor C6, a first resistor R1, a second resistor R4, a third resistor R5, a fourth voltage-dividing resistor R6, a fifth voltage-dividing resistor R8, a sixth current-limiting resistor R9, a first filter capacitor C5, a second filter capacitor C1, a third filter capacitor C2, a fourth filter capacitor C3, a sixth filter capacitor C12, a seventh filter capacitor C13, an eighth filter capacitor C9, a ninth filter capacitor C8, a tenth filter capacitor C11, an eleventh filter capacitor C14, a power supply voltage-source C2 and a valve interface P1;
the positive electrode of the first reverse connection prevention diode D1 is connected with the 1 st pin of the power valve interface P1 and is also connected with the VBB end of the direct-current power supply, and the 2 nd pin of the power valve interface P1 is grounded; the cathode of the first anti-reverse diode D1 is connected with the No. 2 pin of the first power supply voltage stabilizer U1 and one end of a first filter capacitor C5, and the other end of the first filter capacitor C5 and the No. 1 pin of the first power supply voltage stabilizer U1 are grounded at the same time; a pin 3 of the first power supply voltage stabilizer U1 is connected with the anode of the second one-way diode D2, the anode of the first super capacitor C4 and a pin 1 of the valve driving chip U4, the cathode of the first super capacitor C4 is connected with the anode of the second super capacitor C6, and the cathode of the second super capacitor C6 is grounded; the negative electrode of the second unidirectional diode D2 is connected with the 2 nd pin of the second power supply voltage stabilizer U2, and the 1 st pin of the second power supply voltage stabilizer U2 is grounded; the 3 rd pin of the second power supply voltage stabilizer U2 is connected with the anode of the second filter capacitor C1, and the cathode of the second filter capacitor C1 is grounded; the anode of the second filter capacitor C1 is connected to one end of the third filter capacitor C2 and one end of the fourth filter capacitor C3, and the other end of the third filter capacitor C2 and the other end of the fourth filter capacitor C3 are grounded; one end of the first resistor R1 is externally connected with VCC, and the other end is connected with the 6 th pin of the single chip machine; one end of the fifth filter capacitor C7 is connected with the 6 th pin of the singlechip, and the other end is grounded; one end of a sixth filter capacitor C12 and the 1 st pin of the crystal oscillator X1 are connected with the 10 th pin of the singlechip U3, and the other end of the sixth filter capacitor C12 is grounded; one end of a seventh filter capacitor C13 and the 2 nd pin of the crystal oscillator X1 are connected with the 11 th pin of the singlechip U3; the other end of the sixth filter capacitor C12 and the other end of the seventh filter capacitor C13 are grounded together; one end of the eighth filter capacitor C9 is connected with the 1 st pin of the valve driving chip U4, and the other end is grounded; one end of the ninth filter capacitor C8 is connected with the 7 th pin and the 8 th pin of the valve driving chip U4, and the other end is grounded; one end of a tenth filter capacitor C11 is connected with the 2 nd pin of the valve driving chip U4, and the other end is connected with the 3 rd pin of the U4; the 2 nd pin of the valve driving chip U4 is connected with the 2 nd pin of the valve interface P2; the 3 rd pin of the valve driving chip U4 is connected with the 1 st pin of the valve interface P2; the 5 th pin of the valve driving chip U4 is connected with the 4 th pin of the singlechip U3; the 6 th pin of the valve driving chip U4 is connected with the 3 rd pin of the singlechip U3; one end of the current limiting resistor R9 is connected with the 63 rd pin of the singlechip U3, and the other end is connected with the 1 st pin of the triode D4; the 2 nd pin of the triode D4 is connected with one end of a pull-up resistor R4 and one end of a current-limiting resistor R5, and the other end of the pull-up resistor R4 is connected with the anode of the power supply; the other end of the current-limiting resistor R5 is connected with the 3 rd pin of the triode D3; pin 3 of transistor D4 is grounded; the 1 st pin of the triode D3 is connected with the positive electrode of the power supply, the 2 nd pin of the triode D3 is connected with one end of a voltage division resistor R6, and the other end of the voltage division resistor R6 is connected with one end of a voltage division resistor R8 and the 62 nd pin of the singlechip U3; the other pin of the divider resistor R8 is grounded; one end of an eleventh filter capacitor C14 is connected with the 62 nd pin of the singlechip U3, and the other end of the eleventh filter capacitor C14 is grounded; the 13 th pin of the singlechip U3 is grounded; the 14 th pin of the singlechip is externally connected with VCC.
2. The power failure detection circuit based on the single chip microcomputer according to claim 1, wherein the single chip microcomputer U3 adopts a chip with a model number of R7F0C 019; the first power voltage stabilizer U1 and the second power voltage stabilizer U2 are S-1206B33-U3T 1G; the valve driver chip U4 is DRV8837 DSGR.
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| CN201910816340.4A CN110687837A (en) | 2019-08-30 | 2019-08-30 | Power failure detection circuit based on single chip microcomputer |
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| CN201910816340.4A CN110687837A (en) | 2019-08-30 | 2019-08-30 | Power failure detection circuit based on single chip microcomputer |
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Application publication date: 20200114 |