CN209055948U - A kind of power-down protection circuit - Google Patents
A kind of power-down protection circuit Download PDFInfo
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- CN209055948U CN209055948U CN201822213408.3U CN201822213408U CN209055948U CN 209055948 U CN209055948 U CN 209055948U CN 201822213408 U CN201822213408 U CN 201822213408U CN 209055948 U CN209055948 U CN 209055948U
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Abstract
A kind of power-down protection circuit, comprising: metal-oxide-semiconductor Q1, for controlling cut-offfing for power supply；Metal-oxide-semiconductor control circuit is connect with the pole G of metal-oxide-semiconductor；CPU detection circuit, for the folding condition of power control switch K1 to be converted to low level signal or high level signal；Cpu control circuit is connect with metal-oxide-semiconductor control circuit；CPU detection circuit connects CPU with cpu control circuit；The high level signal that CPU is fed back according to CPU detection circuit carries out power operation to the equipment of access power supply；Cpu control circuit, according to the power blackout situation of the equipment of access power supply to metal-oxide-semiconductor control circuit input high level signal or low level signal；Metal-oxide-semiconductor control circuit makes the G extremely low level or high level of metal-oxide-semiconductor Q1 according to the level signal for cut-offfing signal and cpu control circuit of power control switch K1 to control the on or off of metal-oxide-semiconductor Q1.Cut-offfing through a metal-oxide-semiconductor for power supply controls, and the conducting of metal-oxide-semiconductor is codetermined by equipment power switch and several Sofe Switch.
Description
Technical field
The present invention relates to power down/power-off protection more particularly to a kind of equipment shut down firmly in power-down protection circuit.
Background technique
It in hardware system used at present, directly connects using on & off switch on the power line, electricity is connected in booting
Source, device power, shutdown are then directly cut off the power, and device powers down is out of service, even if software systems are handling data and do not having also
There is preservation.Equipment is often shut down firmly in this way, and the service life of electronic building brick can have a greatly reduced quality, and is being handled or untreated complete data
It can not save in time.Therefore, it is necessary to for this equipment in software and hardware system shut down firmly be easily damaged hardware and not can oneself
It dynamic the problem of saving data, is efficiently modified.
Summary of the invention
It is an object of the invention to overcome that data and hard shutdown can not be automatically saved under hard power down condition to hardware damage
The problem of, a kind of power-down protection circuit is provided, cut-offfing through a metal-oxide-semiconductor for power supply controls, and the conducting of metal-oxide-semiconductor is by equipment
Power switch and several Sofe Switch codetermine.
The invention is realized by the following technical scheme:
A kind of power-down protection circuit, the power control switch K1 including connecting input power, which is characterized in that further include:
Metal-oxide-semiconductor Q1, is set between input power and out-put supply, for controlling cut-offfing for power supply；
Metal-oxide-semiconductor control circuit is connect with the pole G of the metal-oxide-semiconductor, is also connect with the power control switch K1 other end；
CPU detection circuit is connect with the metal-oxide-semiconductor control circuit, for by the folding shape of the power control switch K1
State is converted to low level signal or high level signal；
Cpu control circuit is connect with the metal-oxide-semiconductor control circuit；
The CPU detection circuit connects CPU with the cpu control circuit；
The CPU carries out power operation according to equipment of the high level signal of CPU detection circuit feedback to access power supply；
The cpu control circuit, according to the power blackout situation of the equipment of access power supply to metal-oxide-semiconductor control circuit input high level
Signal or low level signal；
The metal-oxide-semiconductor control circuit, according to the level signal for cut-offfing signal and cpu control circuit of power control switch K1
Make the G extremely low level or high level of metal-oxide-semiconductor Q1 to control the on or off of metal-oxide-semiconductor Q1.
According to above-mentioned design, the metal-oxide-semiconductor control circuit, comprising:
The current-limiting resistance R2 connecting with input power is connected in parallel on the voltage-stabiliser tube D1 at the both ends current-limiting resistance R2, with current-limiting resistance
The concatenated current-limiting resistance R5 of R2, the pole C connects the triode Q2 of the pole current-limiting resistance R5, E connection SGND, another with power control switch K1
The divider resistance R3 of one end connection, with the concatenated divider resistance R8 of divider resistance R3；
The pole B of triode Q2 is connected between divider resistance R3 and divider resistance R8；
The pole G of metal-oxide-semiconductor Q1 is connected between current-limiting resistance R2 and current-limiting resistance R5；
It further include photoelectrical coupler U3, the pole C of the 4 connecting triode Q2 of pin of photoelectrical coupler U3, three poles of the connection of pin 3
The pole E of pipe Q2, pin 2 connect GND, and pin 1 connects cpu control circuit.
According to above-mentioned design, the CPU detection circuit, including photoelectrical coupler U2 and draw high resistance R4, photoelectrical coupler
The pin 1 and pin 2 of U2 is connected between divider resistance R3 and divider resistance R8, the pole B of 2 connecting triode Q2 of pin, pin 3
GND is connected, the connection of pin 4 draws high resistance R4 and CPU, draws high resistance R4 connection power vd D2.
According to above-mentioned design, the cpu control circuit, the control being connect respectively with the equipment of access power supply including several groups
Component, the control assembly, including be sequentially connected in series switching diode, first resistor, second resistance, second resistance connect GND,
The junction of the pin 1 of the connection photoelectrical coupler U3 of switching diode, first resistor and second resistance is electric with corresponding access
The equipment in source connects.
Further, the cpu control circuit, the control assembly being connect respectively with the equipment of access power supply including two groups:
First group of control assembly, including the switching diode D2, resistance R6, resistance R9 being sequentially connected in series, resistance R9 connection
The pin 1 of the connection photoelectrical coupler U3 of GND, switching diode D2, the junction of resistance R6 and resistance R9 and corresponding access
The equipment of power supply connects；
Second control assembly, including the switching diode D3, resistance R7, resistance R10 being sequentially connected in series, resistance R10 connection
The pin 1 of the connection photoelectrical coupler U3 of GND, switching diode D3, the junction of resistance R7 and resistance R10 and corresponding access
The equipment of power supply connects.
Specifically, the metal-oxide-semiconductor Q1 is PMOS tube.
Specifically, the triode Q2 is NPN type.
Specifically, the CPU, carries out the synchronous preservation data of disk according to the high level signal of CPU detection circuit feedback, protects
Power operation is carried out to the equipment of access power supply after depositing.
The beneficial effects of the present invention are:
1), facility switching control power-off will not direct forced shutdown, avoid hardware fault caused by directly hard shut down；
2), facility switching control power-off can be ensure that shutdown software data is not lost, be kept away by triggering after software end of operation
Exempt from by the caused software fault that directly shuts down firmly；
3), increase CPU detection circuit, CPU can detecte user's shutdown movement, to do respective handling；
4), power circuit and control circuit isolation, may be implemented the control to different input voltages；
5) more equipment/mainboards, may be implemented to jointly control power supply, do not interfere with each other.
Detailed description of the invention
Fig. 1 is circuit structure block diagram of the invention.
Fig. 2 is work flow diagram of the invention.
Fig. 3 is one embodiment of the present invention circuit diagram.
Specific embodiment
The utility model provides a kind of scheme that hard shutdown is combined with soft-off.Power supply is cut-off through a metal-oxide-semiconductor
It controls, the conducting of metal-oxide-semiconductor is codetermined by the software switch of facility switching and several master control borads: facility switching and several
Software switch has an opening, then metal-oxide-semiconductor powers on；Facility switching and several software switch all disconnect, then metal-oxide-semiconductor cutting electricity
Source.
This programme realizes hardware and software and jointly controls to power supply, when user stir equipment power switch carry out it is powered-down
After operation, software carries out that disk is synchronous to save data, after carry out dragging down software switch and close power supply, when all softwares are opened
After pass all drags down, metal-oxide-semiconductor, which is cut off the power, realizes power-off.
It is as shown in Figure 1 circuit structure block diagram of the invention.
The utility model uses on-off switch of the PMOS tube as power supply, and the VGS of PMOS is negative level driving.
After someone, which stirs power control switch K1, to be powered on, it is preset low that metal-oxide-semiconductor control circuit, which draws the pole G of PMOS tube,
Level, driving PMOS tube conducting, CPU are powered on.After CPU is powered on, detect that K1 switch is closed state by CPU detection circuit,
Pwrctl is drawn as high level simultaneously, is drawn the pole G of PMOS for low level (if there is multiple mainboards/set by MOS control circuit
Standby, then board2, board3 ..., which is realized, drags down the pole G of PMOS), keep PMOS open state.
After someone, which stirs power control switch K1, disconnects it, no longer drawing at K1 is high level, but at Pwrctl still
It is high level, i.e., metal-oxide-semiconductor control circuit still draws the pole G of PMOS for low level, and PMOS continues to be held on, and equipment power supply is protected
It holds normal.After K1 disconnection, CPU detection circuit can detect the disconnection of K1, indicate that someone will shut down, then CPU enters shutdown stream
Journey: saving data, and it is synchronous to carry out disk, after drag down Pwrctl pin and cut off the power with controlling PMOS, when all equipment/
After mainboard all drags down Pwrctl, PMOS, which cuts off the power, completes device powers down.
Metal-oxide-semiconductor control circuit first part is controlled by a NPN triode switching circuit, when K1 closure, triode base
Pole is raised, BE conducting, and control CE conducting powers on to control PMOS conducting.
Metal-oxide-semiconductor control circuit second part is optocoupler circuit composition, and there are two the effects of photoelectrical coupler:
First effect is switch control PMOS, and after Pwrctl pin is raised, i.e. the input terminal of optocoupler receives
Signal is controlled, the output end of optocoupler will drag down the pole G of PMOS, keep the conducting of PMOS；
Second effect is exactly by the low electricity of high-voltage power supply (48V is also possible to other voltages) and CPU of equipment input
Voltage source (3.3V and following) is kept apart.
The input terminal of photoelectrical coupler uses the multiple input circuit of diodes in parallel, and effect is that multiple input terminals are not done mutually
Disturb, and input value reach multiple input values "or" relationship (as long as have one input for height, output for height；Only all
Input is that the output of its low circuit is just low).
CPU detection circuit also using with the concatenated photoelectric coupling circuit of K1, when K1 closure after, the input of optocoupler
End has electric current to pass through, and the output end CPU pin of optocoupler is pulled to low level；After K1 is disconnected, the input terminal of optocoupler does not have electric current
Pass through, then its output end disconnects, and CPU pin is pulled up as high level.
CPU detects the folding condition of K1 by detecting different level values.Here photoelectric coupling circuit also there are two
Effect: one is the switch state for detecting K1 as switching circuit, another effect is also by the high voltage power supply and CPU of equipment
Low-tension supply to being kept apart.
Specifically, workflow of the invention is as shown in Figure 2.
As shown in figure 3, being a kind of embodiment of the invention.
User's toggle switch K1 causes the input of U2 to be connected, is made by the partial pressure of R3 and R8 to device power after K1 is closed
The V of Q2BEThe current limliting of=0.6V(R3 and R8 makes U2 work in normal current range), so that the pole CE of Q2 is connected.The pole CE of Q2 is connected
Later, voltage-stabiliser tube D1 starts to work (current limliting of R2 and R5 make Q2 and Q1 work in normal current range), and the effect of D1 is Q1
VGSStablize the normal voltage range that Q1 is connected in -16V(), so that Q1 is connected, rear class DC-DC power source is powered on, after VDD is powered on
Each master control borad/each equipment is started to work, and CPU, which is detected, pulls up respective Pwrctl for height after U2 drags down PWR_Status
Level, U3 and Q2 is acted on draw R5 for low level simultaneously at this time, and Q1 working condition is constant, and system electrification finishes.
When user's toggle switch K1 is by device powers down, K1 is disconnected, and U2 is without input=0V, the V of Q2 at this timeBEThe pole CE of=0V, Q2
It disconnects, but since U3 also keeps original state to work on, R5 is still pulled to low level, and Q1 continues to keep original state
It powers to rear class DC-DC, each master control borad/each equipment is working properly.Since U2 input is 0, then its output disconnects, and R4 is by PWR_
It is high level that Status, which is drawn, and CPU detects PWR_Status after high level, to start to power off process: saving the number to work
According to, it is synchronous to carry out disk, after corresponding Pwrctl is drawn as low level.After it is low level that Board1_Pwrctl, which is drawn,
Board1_Pwrctl no longer inputs any voltage to U3, but due to the effect of D2, if Board2_Pwrctl is not drawn as low electricity
Flat, the input of U3 will not be drawn is low level, and U3 continues to keep original working condition.Only Board1_Pwrctl and
Board2_Pwrctl draws as after low level, U3 input voltage=0V, the output stage of U3 and Q2, which works, at this time disconnects shape
State, the at this time V of Q1GS=0V, so that Q1 disconnects rear level power supply, system cut-off is finished.
The equipment input voltage of support is controlled by current-limiting resistance, and equipment supports the DC supply input of 18V ~ 72V, works as R3
(different series-parallel combinations can be carried out according to different resistor powers to realize) when=16.2K,
IR3=(UVCC_IN-0.6V-1.2V)/R3=(UVCC_IN-1.8V)/R3,
(pressure drop of U2 is 1.2V, the V of Q2 to its electric current passed through between 1 mA ~ 4.3mA at this timebe=0.6V).R2 and R5 points
It is not set as 16K, the V of Q2CE=0.4V, when VCC_IN is in 18V ~ 32.4V:
IR2=IR5=(UVCC_IN-0.4V) /(R2+R5)= (UVCC_IN-0.4V)/16k；
Between 0.55mA ~ 1mA；
When VCC_IN is in 32.4V ~ 72V:
IR2=16V/16K=1mA,
IR5=(UVCC_IN-0.4V-16V)/R5=(UVCC_IN- 16.4V)/R5,
IR5Between 1mA ~ 3.48mA.
Application of the invention, can solve satellite modem equipment can not automatically save number under hard power down condition
According to, and hard the problem of shutting down to hardware damage.
It should be understood that the foregoing is merely a specific embodiment of the invention, it is not intended to limit the present invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in
Within protection scope of the present invention.
Claims (8)
1. a kind of power-down protection circuit, the power control switch K1 including connecting input power, which is characterized in that further include:
Metal-oxide-semiconductor Q1, is set between input power and out-put supply, for controlling cut-offfing for power supply；
Metal-oxide-semiconductor control circuit is connect with the pole G of the metal-oxide-semiconductor, is also connect with the power control switch K1 other end；
CPU detection circuit is connect with the metal-oxide-semiconductor control circuit, for turning the folding condition of the power control switch K1
It is changed to low level signal or high level signal；
Cpu control circuit is connect with the metal-oxide-semiconductor control circuit；
The CPU detection circuit connects CPU with the cpu control circuit；
The CPU carries out power operation according to equipment of the high level signal of CPU detection circuit feedback to access power supply；
The cpu control circuit, according to the power blackout situation of the equipment of access power supply to metal-oxide-semiconductor control circuit input high level signal
Or low level signal；
The metal-oxide-semiconductor control circuit makes according to the level signal for cut-offfing signal and cpu control circuit of power control switch K1
The G of metal-oxide-semiconductor Q1 extremely low level or high level are to control the on or off of metal-oxide-semiconductor Q1.
2. power-down protection circuit according to claim 1, which is characterized in that the metal-oxide-semiconductor control circuit, comprising:
The current-limiting resistance R2 connecting with input power is connected in parallel on the voltage-stabiliser tube D1 at the both ends current-limiting resistance R2, goes here and there with current-limiting resistance R2
The triode Q2 of the current-limiting resistance pole R5, the C connection pole current-limiting resistance R5, E connection SGND of connection, with the power control switch K1 other end
The divider resistance R3 of connection, with the concatenated divider resistance R8 of divider resistance R3；
The pole B of triode Q2 is connected between divider resistance R3 and divider resistance R8；
The pole G of metal-oxide-semiconductor Q1 is connected between current-limiting resistance R2 and current-limiting resistance R5；
It further include photoelectrical coupler U3, the pole C of the 4 connecting triode Q2 of pin of photoelectrical coupler U3,3 connecting triode Q2 of pin
The pole E, pin 2 connect GND, pin 1 connect cpu control circuit.
3. power-down protection circuit according to claim 2, which is characterized in that the CPU detection circuit, including photoelectric coupling
Device U2 and resistance R4 being drawn high, the pin 1 and pin 2 of photoelectrical coupler U2 is connected between divider resistance R3 and divider resistance R8,
The pole B of 2 connecting triode Q2 of pin, pin 3 connect GND, and the connection of pin 4 draws high resistance R4 and CPU, draw high resistance R4 connection electricity
Source VDD2.
4. power-down protection circuit according to claim 2, which is characterized in that the cpu control circuit, including several components
The control assembly not connect with the equipment of access power supply, the control assembly, including switching diode, the first electricity being sequentially connected in series
Resistance, second resistance, second resistance connect GND, the pin 1 of the connection photoelectrical coupler U3 of switching diode, first resistor and the
The junction of two resistance is connected with the equipment of corresponding access power supply.
5. power-down protection circuit according to claim 4, which is characterized in that the cpu control circuit, including two groups of difference
The control assembly being connect with the equipment of access power supply:
First group of control assembly is opened including the switching diode D2, resistance R6, resistance R9 being sequentially connected in series, resistance R9 connection GND
Close the pin 1 of the connection photoelectrical coupler U3 of diode D2, the junction of resistance R6 and resistance R9 and the corresponding power supply that accesses
Equipment connection；
Second control assembly is opened including the switching diode D3, resistance R7, resistance R10 being sequentially connected in series, resistance R10 connection GND
Close the pin 1 of the connection photoelectrical coupler U3 of diode D3, the junction of resistance R7 and resistance R10 and the corresponding power supply that accesses
Equipment connection.
6. power-down protection circuit according to claim 1, which is characterized in that the metal-oxide-semiconductor Q1 is PMOS tube.
7. power-down protection circuit according to claim 1, which is characterized in that the triode Q2 is NPN type.
8. power-down protection circuit according to claim 1, which is characterized in that the CPU is fed back according to CPU detection circuit
High level signal carry out that disk is synchronous to save data, power operation is carried out to the equipment of access power supply after preservation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822213408.3U CN209055948U (en) | 2018-12-27 | 2018-12-27 | A kind of power-down protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822213408.3U CN209055948U (en) | 2018-12-27 | 2018-12-27 | A kind of power-down protection circuit |
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| CN209055948U true CN209055948U (en) | 2019-07-02 |
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| CN201822213408.3U Active CN209055948U (en) | 2018-12-27 | 2018-12-27 | A kind of power-down protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022134813A1 (en) * | 2020-12-23 | 2022-06-30 | 微创优通医疗科技(嘉兴)有限公司 | Switch control circuit and endoscope system |
-
2018
- 2018-12-27 CN CN201822213408.3U patent/CN209055948U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022134813A1 (en) * | 2020-12-23 | 2022-06-30 | 微创优通医疗科技(嘉兴)有限公司 | Switch control circuit and endoscope system |
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