CN206540973U - Buffer-type power-fail detection circuit - Google Patents
Buffer-type power-fail detection circuit Download PDFInfo
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- CN206540973U CN206540973U CN201720220767.4U CN201720220767U CN206540973U CN 206540973 U CN206540973 U CN 206540973U CN 201720220767 U CN201720220767 U CN 201720220767U CN 206540973 U CN206540973 U CN 206540973U
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Abstract
The utility model discloses a kind of buffer-type power-fail detection circuit, it includes rectification circuit, bleeder circuit, comparator circuit and optical coupling isolation circuit, the input connection alternating current of the rectification circuit, the output end of rectification circuit connects the input of bleeder circuit, the output end of bleeder circuit connects the input of optical coupling isolation circuit, the output end connection electric energy meter MCU of optical coupling isolation circuit by comparator circuit.This programme directly takes voltage signal from high-pressure section, and by electric resistance partial pressure after, comparator circuit is input to, then by optical coupling isolation circuit, output digit signals produce external interrupt to MCU, when MCU detects this interrupt signal, the operation of data storage is completed immediately, now, because high-pressure section has high-voltage capacitance to keep the voltage of high-pressure section slowly to decline, Switching Power Supply can also continue to normal work 12 seconds, so as to ensure that MCU can data storage in time.This programme is applied to all kinds of electric energy measurement instruments.
Description
Technical field
The utility model is related to electric-power metering instrument field, more particularly, to a kind of buffer-type power-fail detection circuit.
Background technology
In the electric energy meter that Switching Power Supply is applied, existing power-fail detection circuit is by transformer secondary output output voltage
Sampling, produces signal to MCU, the state of power-off signal is recognized by MCU, come judge external ac power source it is whether removed or
Person's voltage is reduced to beyond working range（The power down generally said）.
For Switching Power Supply, if the voltage of transformer secondary output output send power-off signal less than to a certain degree
At the time of to MCU, this moment, MCU voltage is supplied in the critical condition for causing MCU normal works, even if MCU is protected at once
Data are protected, because MCU supply voltage will be reduced to below normal working voltage, MCU is (general within shorter transit time
For several ms), it is difficult to complete the complete preservation of mass data.
The content of the invention
The utility model be mainly after the power down solved present in prior art the technical problem that is easily lost of data there is provided
A kind of buffer-type power-fail detection circuit that MCU can be allowed to have longer buffer time to preserve data after a power failure.
The utility model is mainly what is be addressed by following technical proposals for above-mentioned technical problem：A kind of buffer-type
Power-fail detection circuit, including rectification circuit, bleeder circuit, comparator circuit and optical coupling isolation circuit, the rectification circuit it is defeated
Enter end connection alternating current, the output end of rectification circuit connects the input of bleeder circuit, and the output end of bleeder circuit is by comparing
Device circuit connects the input of optical coupling isolation circuit, the output end connection electric energy meter MCU of optical coupling isolation circuit；Bleeder circuit includes
Resistance R10, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, electric capacity
C30, electric capacity C31 and electric capacity C32, the electric capacity C30 positive pole connection rectification circuit output end positive pole, electric capacity C30 negative pole connect
Connect electric capacity C31 positive pole, electric capacity C31 negative pole connection electric capacity C32 positive pole, electric capacity C32 negative pole connection rectification circuit output
Hold negative pole, resistance R10, resistance R12 and resistance R13 in parallel with electric capacity C30 after connecting, resistance R14, resistance R15 and resistance R16 strings
It is in parallel with electric capacity C31 after connection, resistance R17, resistance R18 and resistance R19 series connection after, resistance R19 first end in parallel with electric capacity C32
Connect resistance R18, resistance R19 the second end connection electric capacity C32 negative pole.
This programme directly takes voltage signal from high-pressure section, and by electric resistance partial pressure after, be input to comparator circuit, then
By optical coupling isolation circuit, output digit signals produce external interrupt to MCU, when MCU detects this interrupt signal, completed immediately
The operation of data storage, now, because high-pressure section has high-voltage capacitance to keep the voltage of high-pressure section slowly to decline, Switching Power Supply
It can also continue to normal work 1-2 seconds, such secondary output voltage supply MCU is used, moreover it is possible to ensure that the stabilization of 1-2 seconds is exported,
Compared to available circuit, in time, this circuit had the power-off signal lead of 1-2 seconds, in the transient process of this 1-2 seconds
In, MCU supply voltages do not have any change, so that ensure that MCU can perform associated inner control instruction, reliable protection
Substantial amounts of data.
Preferably, the comparator circuit includes resistance R4, resistance R8, resistance R21, resistance R22, diode ZD7, electricity
Hold C3, electric capacity C36, voltage stabilizing chip U2 and triode Q4；The first end connection resistance R19 of resistance R21 first end, resistance
R21 the second end connection voltage stabilizing chip U2 2 pin, diode ZD7 positive pole connection voltage stabilizing chip U2 3 pin, diode ZD7's
Negative pole connection voltage stabilizing chip U2 2 pin；Electric capacity C3 is connected across between voltage stabilizing chip U2 2 pin and 3 pin；Voltage stabilizing chip U2 3 pin
It is also connected with resistance R19 the second end and as ground wire；Resistance R4 first end connection normal voltage VCC_F, the second end connection is steady
Press chip U2 1 pin；Triode Q4 base stage is connected by resistance R8 connection voltage stabilizing chips U2 1 pin, colelctor electrode by resistance R22
Connect voltage stabilizing chip U2 3 pin, emitter stage connection optical coupling isolation circuit；Electric capacity C36 first end connection normal voltage VCC_F, the
Two ends are grounded.
Comparator circuit is detected to the signal on resistance R19, when the voltage on resistance R19 changes, is passed through
Compare the information for directly obtaining power down, then send this information to optical coupling isolation circuit.
Preferably, the optical coupling isolation circuit includes optocoupler P2 and electric capacity C37, the optocoupler P2 input anode connect
Normal voltage VCC_F is met, input cathode connecting triode Q4 emitter stage, output head anode is connected to electricity by power-off signal
Can table MCU, negative pole of output end ground connection；Electric capacity C37 is connected across between optocoupler P2 output head anode and negative pole of output end.
Optical coupling isolation circuit isolates MCU and high-pressure section, the safety of protection circuit.
Preferably, the voltage stabilizing chip U2 is TL431AIDBZ chips.
Preferably, the rectification circuit is bridge rectifier.
The beneficial effect that the utility model is brought is MCU normal working voltages to be able to maintain that after power down 1-2 seconds, and in time
Power down information is sent to MCU, makes MCU have enough time to preserve data, it is to avoid loss of data.
Brief description of the drawings
Fig. 1 is the circuit diagram of a kind of rectification circuit of the present utility model and bleeder circuit；
Fig. 2 is the circuit diagram of a kind of comparator circuit of the present utility model and optical coupling isolation circuit.
Embodiment
Below by embodiment, and with reference to accompanying drawing, the technical solution of the utility model is described in further detail.
Embodiment：A kind of buffer-type power-fail detection circuit of the present embodiment, including rectification circuit, bleeder circuit, comparator
Circuit and optical coupling isolation circuit, the input connection alternating current of the rectification circuit, the output end connection partial pressure electricity of rectification circuit
The input on road, the output end of bleeder circuit connects the input of optical coupling isolation circuit, light-coupled isolation electricity by comparator circuit
The output end connection electric energy meter MCU on road.
As indicated with 1, bleeder circuit includes resistance R10, resistance R12, resistance R13, resistance R14, resistance R15, resistance
R16, resistance R17, resistance R18, resistance R19, electric capacity C30, electric capacity C31 and electric capacity C32, the electric capacity C30 positive pole connection it is whole
Current circuit output head anode, electric capacity C30 negative pole connection electric capacity C31 positive pole, electric capacity C31 negative pole connection electric capacity C32 is just
With electric capacity after pole, electric capacity C32 negative pole connection rectification circuit output end negative pole, resistance R10, resistance R12 and resistance R13 series connection
, resistance R17, resistance R18 and resistance R19 in parallel with electric capacity C31 after C30 parallel connections, resistance R14, resistance R15 and resistance R16 series connection
In parallel with electric capacity C32 after series connection, resistance R19 first end connection resistance R18, resistance R19 the second end connection electric capacity C32's is negative
Pole.
As shown in Fig. 2 comparator circuit includes resistance R4, resistance R8, resistance R21, resistance R22, diode ZD7, electric capacity
C3, electric capacity C36, voltage stabilizing chip U2 and triode Q4；The first end connection resistance R19 of resistance R21 first end, resistance
R21 the second end connection voltage stabilizing chip U2 2 pin, diode ZD7 positive pole connection voltage stabilizing chip U2 3 pin, diode ZD7's
Negative pole connection voltage stabilizing chip U2 2 pin；Electric capacity C3 is connected across between voltage stabilizing chip U2 2 pin and 3 pin；Voltage stabilizing chip U2 3 pin
It is also connected with resistance R19 the second end and as ground wire；Resistance R4 first end connection normal voltage VCC_F, the second end connection is steady
Press chip U2 1 pin；Triode Q4 base stage is connected by resistance R8 connection voltage stabilizing chips U2 1 pin, colelctor electrode by resistance R22
Connect voltage stabilizing chip U2 3 pin, emitter stage connection optical coupling isolation circuit；Electric capacity C36 first end connection normal voltage VCC_F, the
Two ends are grounded.
Comparator circuit is detected to the signal on resistance R19, when the voltage on resistance R19 changes, is passed through
Compare the information for directly obtaining power down, then send this information to optical coupling isolation circuit.
Optical coupling isolation circuit includes optocoupler P2 and electric capacity C37, the optocoupler P2 input anode connection normal voltage
VCC_F, input cathode connecting triode Q4 emitter stage, output head anode is connected to electric energy meter MCU by power-off signal, defeated
Go out to hold negative pole to be grounded；Electric capacity C37 is connected across between optocoupler P2 output head anode and negative pole of output end.
Optical coupling isolation circuit isolates MCU and high-pressure section, the safety of protection circuit.
Voltage stabilizing chip U2 is TL431AIDBZ chips.
Rectification circuit is bridge rectifier, and input is generally 220V or 380V alternating currents.The Switching Power Supply of electric energy meter
Connect rectification circuit output end.
This programme directly takes voltage signal from high-pressure section, and by electric resistance partial pressure after, be input to comparator circuit, then
By optical coupling isolation circuit, output digit signals produce external interrupt to MCU, when MCU detects this interrupt signal, completed immediately
The operation of data storage, now, because high-pressure section has high-voltage capacitance to keep the voltage of high-pressure section slowly to decline, Switching Power Supply
It can also continue to normal work 1-2 seconds, the transformer secondary output output voltage supply MCU of such Switching Power Supply is used, moreover it is possible to ensured
The stable output of 1-2 seconds, compared to available circuit, in time, this circuit has the power-off signal lead of 1-2 seconds, at this
In individual 1-2 seconds transient process, MCU supply voltages do not have any change, so as to ensure that MCU can perform associated inner control
System instruction, reliably protects substantial amounts of data.
Specific embodiment described herein is only to the invention spirit explanation for example.The utility model institute
Category those skilled in the art can make various modifications or supplement or using similar to described specific embodiment
Mode substitute, but without departing from principle of the present utility model or surmount scope defined in appended claims.
Although more having used the terms such as bleeder circuit, comparator circuit, voltage stabilizing chip herein, it is not precluded from using
The possibility of other terms.It is used for the purpose of more easily describing and explaining essence of the present utility model using these terms；
They are construed to any additional limitation and all disagreed with the invention spirit.
Claims (5)
1. a kind of buffer-type power-fail detection circuit, it is characterised in that including rectification circuit, bleeder circuit, comparator circuit and light
Coupling isolation circuit, the input connection alternating current of the rectification circuit, the output end of rectification circuit connects the input of bleeder circuit
End, the output end of bleeder circuit connects the input of optical coupling isolation circuit, the output of optical coupling isolation circuit by comparator circuit
End connection electric energy meter MCU；Bleeder circuit include resistance R10, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16,
Resistance R17, resistance R18, resistance R19, electric capacity C30, electric capacity C31 and electric capacity C32, the electric capacity C30 positive pole connection rectified current
Road output head anode, electric capacity C30 negative pole connection electric capacity C31 positive pole, electric capacity C31 negative pole connection electric capacity C32 positive pole, electricity
After appearance C32 negative pole connection rectification circuit output end negative pole, resistance R10, resistance R12 and resistance R13 series connection with electric capacity C30 simultaneously
It is in parallel with electric capacity C31 after connection, resistance R14, resistance R15 and resistance R16 series connection, after resistance R17, resistance R18 and resistance R19 connect
It is in parallel with electric capacity C32, resistance R19 first end connection resistance R18, resistance R19 the second end connection electric capacity C32 negative pole.
2. buffer-type power-fail detection circuit according to claim 1, it is characterised in that the comparator circuit includes resistance
R4, resistance R8, resistance R21, resistance R22, diode ZD7, electric capacity C3, electric capacity C36, voltage stabilizing chip U2 and triode Q4；It is described
Resistance R21 first end connection resistance R19 first end, resistance R21 the second end connection voltage stabilizing chip U2 2 pin, diode
ZD7 positive pole connection voltage stabilizing chip U2 3 pin, diode ZD7 negative pole connection voltage stabilizing chip U2 2 pin；Electric capacity C3 is connected across
Between voltage stabilizing chip U2 2 pin and 3 pin；Voltage stabilizing chip U2 3 pin are also connected with resistance R19 the second end and as ground wire；Resistance
R4 first end connection normal voltage VCC_F, the second end connection voltage stabilizing chip U2 1 pin；Triode Q4 base stage passes through resistance
R8 connection voltage stabilizing chips U2 1 pin, colelctor electrode passes through resistance R22 connection voltage stabilizing chips U2 3 pin, emitter stage connection light-coupled isolation
Circuit；Electric capacity C36 first end connection normal voltage VCC_F, the second end ground connection.
3. buffer-type power-fail detection circuit according to claim 2, it is characterised in that the optical coupling isolation circuit includes light
Coupling P2 and electric capacity C37, the optocoupler P2 input anode connection normal voltage VCC_F, input cathode connecting triode Q4
Emitter stage, output head anode is connected to electric energy meter MCU by power-off signal, negative pole of output end ground connection；Electric capacity C37 is connected across light
Between coupling P2 output head anode and negative pole of output end.
4. the buffer-type power-fail detection circuit according to Claims 2 or 3, it is characterised in that the voltage stabilizing chip U2 is
TL431AIDBZ chips.
5. buffer-type power-fail detection circuit according to claim 1, it is characterised in that the rectification circuit is bridge rectifier
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720220767.4U CN206540973U (en) | 2017-03-08 | 2017-03-08 | Buffer-type power-fail detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720220767.4U CN206540973U (en) | 2017-03-08 | 2017-03-08 | Buffer-type power-fail detection circuit |
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| CN206540973U true CN206540973U (en) | 2017-10-03 |
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| CN201720220767.4U Active CN206540973U (en) | 2017-03-08 | 2017-03-08 | Buffer-type power-fail detection circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110058145A (en) * | 2019-05-07 | 2019-07-26 | 苏州格美芯微电子有限公司 | A kind of low-power chip power-fail detection circuit |
| CN110687845A (en) * | 2019-10-18 | 2020-01-14 | 杭州和利时自动化有限公司 | Hot standby redundancy control system of DCS |
| CN111141949A (en) * | 2020-02-12 | 2020-05-12 | 东南大学 | Alternating voltage sampling circuit for output power control and design method thereof |
| CN112379174A (en) * | 2020-11-30 | 2021-02-19 | 贵州航天风华实业有限公司 | Circuit for detecting resistance and drain voltage of same-line |
| CN115932386A (en) * | 2023-03-09 | 2023-04-07 | 深圳龙电华鑫控股集团股份有限公司 | Electric energy metering circuit and electric energy metering device |
-
2017
- 2017-03-08 CN CN201720220767.4U patent/CN206540973U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110058145A (en) * | 2019-05-07 | 2019-07-26 | 苏州格美芯微电子有限公司 | A kind of low-power chip power-fail detection circuit |
| CN110687845A (en) * | 2019-10-18 | 2020-01-14 | 杭州和利时自动化有限公司 | Hot standby redundancy control system of DCS |
| CN111141949A (en) * | 2020-02-12 | 2020-05-12 | 东南大学 | Alternating voltage sampling circuit for output power control and design method thereof |
| CN111141949B (en) * | 2020-02-12 | 2022-02-11 | 东南大学 | Alternating voltage sampling circuit for output power control and design method thereof |
| CN112379174A (en) * | 2020-11-30 | 2021-02-19 | 贵州航天风华实业有限公司 | Circuit for detecting resistance and drain voltage of same-line |
| CN115932386A (en) * | 2023-03-09 | 2023-04-07 | 深圳龙电华鑫控股集团股份有限公司 | Electric energy metering circuit and electric energy metering device |
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