CN204256036U - The power-off signal that power supply interrupts produces circuit - Google Patents
The power-off signal that power supply interrupts produces circuit Download PDFInfo
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- CN204256036U CN204256036U CN201420589974.3U CN201420589974U CN204256036U CN 204256036 U CN204256036 U CN 204256036U CN 201420589974 U CN201420589974 U CN 201420589974U CN 204256036 U CN204256036 U CN 204256036U
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Abstract
The utility model provides the power-off signal generation circuit that a kind of power supply interrupts, comprise power-fail detection circuit, voltage comparator circuit and power circuit: power-fail detection circuit comprises the stabilivolt V114 connected successively, diode V58, R284 and R267, and C97 and diode V57, stabilivolt V114 negative pole is connected with external power supply, positive pole is connected with the positive pole of diode V58, ground connection after C97 and R267 parallel connection, diode V57 negative pole and R284, the junction of R267 connects, positive pole is connected with power circuit, R284, the junction of R267 is connected with voltage comparator circuit, voltage comparator circuit comprises voltage comparator, and voltage comparator first port is power-off signal output terminal, and voltage comparator second port is connected with power-fail detection circuit, voltage comparator the 3rd port ground connection.The utility model can notify that when external power interruption microprocessor carries out corresponding power down process in time.
Description
Technical field
The utility model relates to a kind of control signal and produces technical field.Specifically, the power-off signal generation circuit that a kind of power supply interrupts is related to.
Background technology
The central processing unit of microprocessor a slice or several large scale integrated circuit compositions.These circuit perform the function of control assembly and arithmetic logical unti.Microprocessor, compared with traditional central processing unit, has the advantages such as little, the lightweight and easy modularization of volume.The element of microprocessor has: register file, arithmetical unit, sequential control circuit, and data and address bus.Microprocessor can complete instruction fetch, perform instruction, and with the operation such as extraneous storer and logical block exchange information, be the operation control part of microcomputer.It can form microcomputer with storer and peripheral circuit chip.
Microprocessor is ubiquitous, no matter is the household appliances such as video recorder, intelligent washing machine, mobile phone, or car engine controls, and numerically-controlled machine, guided missile precise guidance etc. all will embed all kinds of different microprocessor.The core component of microcomputer is not only by microprocessor, is also the critical component of various digital intelligent equipment.The high-end computational systems such as international giant ultra-high-speed computer, mainframe computer also all adopt a large amount of general high-performance microprocessors to build.
The use of micro-process is more and more extensive, in common opertaing device, is all provided with microprocessor.At present in the DC power supply apparatus that some are important, in operational process, microprocessor often processes a large amount of real time datas, if the unexpected power-off of the external power supply of device, the data in the buffer memory such as parameter, user program set in microprocessor are needed to be saved in storage medium, in order to avoid cause loss of data.For this reason, in the device that some do not have standby power supply to power, need to detect power-off signal, once the power down of discovery external power supply, before the complete power-off of device, the data in buffer memory are saved, with the reliability of the integrality and device that ensure data.
Utility model content
For this reason, when technical problem to be solved in the utility model is do not have standby power supply, device needs to obtain power-off signal in time the data in microprocessor cache to be saved before complete power-off, thus proposes a kind of can interruption and produce the power-off signal generation circuit of power-off signal by the external power supply of Timeliness coverage.
For solving the problems of the technologies described above, the utility model provides following technical scheme:
The power-off signal that a kind of power supply interrupts produces circuit, comprise power-fail detection circuit and the voltage comparator circuit be connected with power-fail detection circuit respectively and power circuit: power-fail detection circuit comprises the stabilivolt V114 be sequentially connected in series, diode V58, resistance R284 and resistance R267, and electric capacity C97 and diode V57, the negative pole end of stabilivolt V114 is connected with external power supply, positive terminal is connected with the positive terminal of diode V58, the negative pole end of diode V58 is connected with one end of resistance R284, the other end of resistance R284 is connected with one end of resistance R267, the other end ground connection of resistance R267, electric capacity C97 is in parallel with resistance R267, the negative pole end of diode V57 is connected with the junction of resistance R284 and resistance R267, positive terminal is connected with power circuit, the junction of resistance R284 and resistance R267 is also as the output terminal of power-fail detection circuit, be connected with voltage comparator circuit, voltage comparator circuit comprises voltage comparator V62, first port of voltage comparator V62 produces the power-off signal output terminal of circuit as power-off signal, second port of voltage comparator V62 is connected with the output terminal of power-fail detection circuit, the 3rd port ground connection of voltage comparator V62, also comprise resistance R33, one end of resistance R33 is connected with first port of voltage comparator V62, and the other end of resistance R33 is connected with the voltage pull-up power supply of peripheral hardware.
As optimization, also comprise electric capacity C104, one end of electric capacity C104 be connected with first port of voltage comparator V62, other end ground connection.
As optimization, power circuit is capacitor energy storage circuit, capacitor energy storage circuit comprises the diode V32, mu balanced circuit, current-limiting circuit and the diode V25 that connect successively, the positive pole of diode V32 is connected with external power supply, negative pole is connected with mu balanced circuit, diode V25 positive pole is connected with current-limiting circuit, negative pole is connected with the positive pole of the diode V57 of power-fail detection circuit, capacitor energy storage circuit also comprises the energy storage circuit be made up of the energy-storage units circuit of several series connection, and the positive terminal of energy storage circuit is connected with the anode of diode V25, negative pole end ground connection.
As optimization, energy-storage units circuit comprises a super capacitor and resistance, super capacitor and a resistor coupled in parallel.
As optimization, the resistance sizes of energy-storage units circuit is all consistent.
Technique scheme of the present utility model has the following advantages compared to existing technology:
1, the power-off signal that the power supply that the utility model provides interrupts produces circuit, the voltage drop of external power supply can be detected, it also do not drop to jeopardize voltage that device normally works before just send power-off signal, microprocessor proceeds to power down operations pattern immediately after receiving power-off signal, such as preserves current electric energy, carries out power management and data cached preservation etc.The utility model circuit structure is simple, only use an OC gate voltage comparer V62, external power supply voltage can be real-time monitored whether decline, thus real-time judge whether power down, do not need to adopt other microprocessors such as single-chip microcomputer, save the time that corresponding power down process is made in detection of power loss and micro-process to a great extent, can before external power supply drops to 0V, utilize carry out the operations such as data cached preservation the blink of voltage drop, but the low reliability of cost is high.Do not arranging in the apparatus system of standby power supply, the utility model can ensure the integrality of system operation data equally.The utility model has applicability widely, as can be applicable in power supply network in power quality detection system.
2, the power-off signal power circuit produced in circuit that the power supply that provides of the utility model interrupts can be able to provide a lower voltage to diode V57 when external power supply normally works or interrupts, to ensure when external power supply is normal, because of diode cathode voltage higher than cathode voltage by, and when external power interruption, there is provided a lower voltage to OC gate voltage comparer V62, disconnect to make OC door, and resistance R33 is connected with the voltage pull-up power supply of peripheral hardware, thus power-off signal generation circuit is made to export a high level power-off signal.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein
Fig. 1 is that the power-off signal that a kind of power supply of the utility model embodiment interrupts produces circuit diagram;
Fig. 2 is a kind of power circuit diagram of the utility model embodiment.
Embodiment
In order to make those skilled in the art person understand the utility model scheme better, below in conjunction with drawings and Examples, technical scheme provided by the utility model is described in further detail.
As shown in Figure 1, the utility model provides the power-off signal generation circuit that a kind of power supply interrupts, comprise power-fail detection circuit and the voltage comparator circuit be connected with power-fail detection circuit respectively and power circuit, power-fail detection circuit comprises the stabilivolt V114 be sequentially connected in series, diode V58, resistance R284 and resistance R267, and electric capacity C97 and diode V57, the negative pole end of stabilivolt V114 is connected with external power supply, positive terminal is connected with the positive terminal of diode V58, the negative pole end of diode V58 is connected with one end of resistance R284, the other end of resistance R284 is connected with one end of resistance R267, the other end ground connection of resistance R267, electric capacity C97 is in parallel with resistance R267, the negative pole end of diode V57 is connected with the junction of resistance R284 and resistance R267, positive terminal is connected with power circuit, the junction of resistance R284 and resistance R267 is also as the output terminal of power-fail detection circuit, be connected with voltage comparator circuit, voltage comparator circuit comprises voltage comparator V62, first port of voltage comparator V62 produces the power-off signal output terminal of circuit as power-off signal, second port of voltage comparator V62 is connected with the output terminal of power-fail detection circuit, the 3rd port ground connection of voltage comparator V62.Voltage comparator V62 is an OC gate voltage comparer.This circuit for core with voltage comparator V62, judges external power supply whether power-off, namely produces power-off signal after judging power-off, accurately can judge by assurance device, rationally work powering on, under lower electricity and abnormal conditions.Use special power management chip to produce power-off signal reliable, also can reduce the burden of microprocessor.
The Main Function that the power-off signal that the power supply that the utility model provides interrupts produces circuit notifies that when external power source interrupts microprocessor carries out the respective handling of external power supply interruption in time, such as preserves current electric energy, carry out power management and carry out file system protection etc.When external power supply normally provides 15V direct current supply, 7.5V stabilivolt V114 is in reverse breakdown state, and now diode V57 ends, and electric capacity C97 both end voltage is close to 7V; When external power supply interrupts, 15V DC voltage slowly declines, when voltage is reduced to about 8.3V, stabilivolt V114 is in reverse blocking state, at this moment diode V57 conducting, electric capacity C97 both end voltage is provided by power circuit, is less than 5.5V when the voltage that power circuit provides is input to OC gate voltage comparer V62.The power-off signal that power supply interrupts produces circuit normally with when interrupting provides different voltage to be convenient to the monitoring of voltage comparator circuit below at external power supply.The input voltage of second port of voltage comparator V62 higher than OC door conducting during 5.5V, when input voltage lower than during 5.5V OC door disconnect.Therefore, when the power-off signal output terminal of this circuit exports high level, then represent external power supply power-off.
Optimally, the present embodiment also comprises resistance R33, and one end of resistance R33 is connected with first port of voltage comparator V62, and the other end of resistance R33 is connected with the voltage pull-up power supply of peripheral hardware.Power-off signal PDIN carries out signal pull-up in outside by 3.3V voltage pull-up power supply and detects to be supplied to microprocessor.When microprocessor detects that power-off signal PDIN is high level, represent external power supply power-off.
Preferably, also comprise electric capacity C104, one end of electric capacity C104 be connected with first port of voltage comparator V62, other end ground connection.The effect of electric capacity C104 is filter action, filters out the electromagnetic interference (EMI) of electrical signal, in order to avoid cause maloperation, improves the reliability of device.
As shown in Figure 2, power circuit in the utility model is capacitor energy storage circuit, capacitor energy storage circuit comprises the diode V32, mu balanced circuit, current-limiting circuit and the diode V25 that connect successively, the positive pole of diode V32 is connected with external power supply, negative pole is connected with mu balanced circuit, and diode V32 effect is for preventing capacitance current from pouring in down a chimney in external power supply circuit when preventing external power source from interrupting.Diode V25 positive pole is connected with current-limiting circuit, negative pole is connected with the positive pole of diode V57, capacitor energy storage circuit also comprises the energy storage circuit be made up of the energy-storage units circuit of several series connection, and the positive terminal of energy storage circuit is connected with the anode of diode V25, negative pole end ground connection.Particularly, energy-storage units circuit comprises a super capacitor in parallel and a resistance.And the resistance of all energy-storage units circuit and the size of super capacitor all consistent.The substitutional resistance be also connected with super capacitor is mainly in order to ensure that the both end voltage of super capacitor is consistent, in order to avoid voltage inequality causes super capacitor local superpotential and damages.Super capacitor series aiding connection in energy storage circuit.As optimization, the present embodiment also comprises electric capacity C49, and one end of electric capacity C49 is connected with the negative pole of diode V32, other end ground connection.Current-limiting circuit is made up of resistance R14 and R15 parallel connection, can anti-locking apparatus when starting electric current excessive, cause installation's power source normally to start.The power circuit of the present embodiment can provide to the positive pole all to diode V57 the voltage being less than 6V when external power supply normally works or interrupts, and so the voltage of diode cathode is less than 5.5V, and the voltage be namely input in OC gate voltage comparer V62 is less than 5.5V.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain that the utility model creates.
Claims (5)
1. the power-off signal that power supply interrupts produces a circuit, comprises power-fail detection circuit and the voltage comparator circuit be connected with power-fail detection circuit respectively and power circuit, it is characterized in that:
Described power-fail detection circuit comprises the stabilivolt V114 be sequentially connected in series, diode V58, resistance R284 and resistance R267, and electric capacity C97 and diode V57, the negative pole end of described stabilivolt V114 is connected with external power supply, positive terminal is connected with the positive terminal of described diode V58, the negative pole end of described diode V58 is connected with one end of described resistance R284, the other end of described resistance R284 is connected with one end of described resistance R267, the other end ground connection of described resistance R267, described electric capacity C97 is in parallel with described resistance R267, the negative pole end of described diode V57 is connected with the junction of described resistance R284 and described resistance R267, positive terminal is connected with described power circuit, the junction of described resistance R284 and described resistance R267 is also as the output terminal of power-fail detection circuit, be connected with described voltage comparator circuit,
Described voltage comparator circuit comprises voltage comparator V62, first port of described voltage comparator V62 produces the power-off signal output terminal of circuit as power-off signal, second port of described voltage comparator V62 is connected with the output terminal of described power-fail detection circuit, the 3rd port ground connection of described voltage comparator V62;
Also comprise resistance R33, one end of described resistance R33 is connected with first port of described voltage comparator V62, and the other end of described resistance R33 is connected with voltage pull-up power supply.
2. the power-off signal that power supply as claimed in claim 1 interrupts produces circuit, it is characterized in that, also comprises electric capacity C104, one end of described electric capacity C104 is connected with first port of described voltage comparator V62, other end ground connection.
3. the power-off signal that power supply as claimed in claim 1 interrupts produces circuit, it is characterized in that, described power circuit is capacitor energy storage circuit, described capacitor energy storage circuit comprises the diode V32 connected successively, mu balanced circuit, current-limiting circuit and diode V25, the positive pole of described diode V32 is connected with external power supply, negative pole is connected with described mu balanced circuit, described diode V25 positive pole is connected with described current-limiting circuit, negative pole is connected with the positive pole of the described diode V57 of described power-fail detection circuit, described capacitor energy storage circuit also comprises the energy storage circuit be made up of the energy-storage units circuit of several series connection, the positive terminal of described energy storage circuit is connected with the anode of described diode V25, negative pole end ground connection.
4. the power-off signal that power supply as claimed in claim 3 interrupts produces circuit, and it is characterized in that, described energy-storage units circuit comprises a super capacitor and a resistance, described super capacitor and resistor coupled in parallel.
5. the power-off signal that power supply as claimed in claim 4 interrupts produces circuit, and it is characterized in that, the resistance sizes of described energy-storage units circuit is all consistent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420589974.3U CN204256036U (en) | 2014-10-13 | 2014-10-13 | The power-off signal that power supply interrupts produces circuit |
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| CN201420589974.3U CN204256036U (en) | 2014-10-13 | 2014-10-13 | The power-off signal that power supply interrupts produces circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115105A (en) * | 2015-08-28 | 2015-12-02 | 广东美的制冷设备有限公司 | Power failure detection method and system and air conditioner |
| CN107045749A (en) * | 2017-03-24 | 2017-08-15 | 深圳怡化电脑股份有限公司 | A kind of paper money automatic trading device and its stand-by power supply |
| CN108364605A (en) * | 2017-01-26 | 2018-08-03 | 上海和辉光电有限公司 | The automatic system and mobile terminal for restoring OLED display panel dispaly state |
| CN110865231A (en) * | 2019-12-09 | 2020-03-06 | 浙江中控技术股份有限公司 | Power supply voltage detection circuit for bus isolation |
| CN111443790A (en) * | 2020-04-07 | 2020-07-24 | 广东公信智能会议股份有限公司 | Power failure detection and protection circuit |
-
2014
- 2014-10-13 CN CN201420589974.3U patent/CN204256036U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115105A (en) * | 2015-08-28 | 2015-12-02 | 广东美的制冷设备有限公司 | Power failure detection method and system and air conditioner |
| CN105115105B (en) * | 2015-08-28 | 2017-10-13 | 广东美的制冷设备有限公司 | Power failure detection method, detection of power loss system and air conditioner |
| CN108364605A (en) * | 2017-01-26 | 2018-08-03 | 上海和辉光电有限公司 | The automatic system and mobile terminal for restoring OLED display panel dispaly state |
| CN107045749A (en) * | 2017-03-24 | 2017-08-15 | 深圳怡化电脑股份有限公司 | A kind of paper money automatic trading device and its stand-by power supply |
| CN110865231A (en) * | 2019-12-09 | 2020-03-06 | 浙江中控技术股份有限公司 | Power supply voltage detection circuit for bus isolation |
| CN111443790A (en) * | 2020-04-07 | 2020-07-24 | 广东公信智能会议股份有限公司 | Power failure detection and protection circuit |
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