CN107332208A - A kind of protection circuit, mainboard guard method and terminal - Google Patents
A kind of protection circuit, mainboard guard method and terminal Download PDFInfo
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- CN107332208A CN107332208A CN201610286819.8A CN201610286819A CN107332208A CN 107332208 A CN107332208 A CN 107332208A CN 201610286819 A CN201610286819 A CN 201610286819A CN 107332208 A CN107332208 A CN 107332208A
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- Prior art keywords
- voltage
- mainboard
- electrically connected
- supply unit
- power supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
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Abstract
The embodiment of the present invention provides a kind of protection circuit, mainboard guard method and terminal, is related to circuit field, can avoid mainboard due to causing the device damage on the mainboard in the condition of high temperature.The protection circuit includes thermistor, the first pull-up resistor, voltage comparison unit and to power supply unit; one end of first pull-up resistor is electrically connected with thermistor; the other end is electrically connected with first voltage; one end of thermistor is electrically connected with the first pull-up resistor, voltage comparison unit; the other end is grounded; the first input end of voltage comparison unit is electrically connected with thermistor, and the second input is electrically connected with reference voltage, and the control end of output end and power supply unit is electrically connected.Voltage comparison unit is used for the size for comparing the voltage of first input end and the voltage of the second input, and according to comparative result to power supply unit transmission control signal to control power supply unit being turned on or off to the supply access of mainboard.The protection circuit is applied in terminal.
Description
Technical field
The present invention relates to circuit field, more particularly to a kind of protection circuit, mainboard guard method and end
End.
Background technology
At present, many terminals can connect peripheral hardware by peripheral interface, can power or fill for peripheral hardware
Electricity.It is during peripheral hardware charges or powered, when extracting peripheral hardware, if the periphery of the terminal in terminal
Voltage shut-off on interface is later than the action for extracting peripheral hardware, then the pin of the peripheral interface may be with the end
Other pins short circuit on the mainboard at end, so as to cause the temperature moment of mainboard to raise, when temperature is too high
When, it is likely to result in the device damage on the mainboard.
The content of the invention
Embodiments of the invention provide a kind of protection circuit, mainboard guard method and terminal, can avoid
Mainboard in the condition of high temperature due to causing the device damage on the mainboard.
To reach above-mentioned purpose, embodiments of the invention are adopted the following technical scheme that：
In a first aspect, the embodiment of the present invention provides a kind of protection circuit, applied to mainboard, including：It is negative
Temperature coefficient (Negative Temperature Coefficient, NTC) thermistor, on first
Pull-up resistor, voltage comparison unit and to power supply unit, one end of first pull-up resistor and the temperature-sensitive
Resistance electrical is connected, and the other end and first voltage are electrically connected, one end of the thermistor with this first
The first input end electrical connection of pull-up resistor, the voltage comparison unit, other end ground connection, the voltage
The first input end of comparing unit is electrically connected with the thermistor, and the second of the voltage comparison unit is defeated
Enter end to be electrically connected with reference voltage, the output end of the voltage comparison unit and the control of the power supply unit
End electrical connection.
The voltage comparison unit, for comparing the voltage of first input end and the voltage of the second input
Size, and send control signal to control the power supply unit to this to the power supply unit according to comparative result
The supply access of mainboard is turned on or off.
Based on protection circuit provided in an embodiment of the present invention, by thermistor, mainboard is detected in real time
Temperature, can compare the voltage of thermistor and the magnitude relationship of reference voltage, and according to comparative result
Control power supply unit is turned on or off to the supply access of mainboard, to realize that the temperature in mainboard reaches
Or be when being up to early warning temperature, power supply of the power supply unit to mainboard to be disconnected by hardware circuit and led to
Road, to cause power supply unit no longer for the main board power supply, so as to avoid mainboard due in high temperature shape
State and cause the device damage on the mainboard.
Optionally, power supply unit includes switching device and battery, the control end of the switching device and the confession
The control end electrical connection of electric unit, the switching device is serially connected in the supply access of the battery, according to
The control signal that the voltage comparison unit is sent is operated in the state of being turned on or off, to be turned on or off this
Supply access.
In above-mentioned optional mode, by being turned on or off for controlling switch device, to control power supply logical
Road is turned on or off, it is possible to increase efficiency that supply access is turned on or off.
Optionally, power supply unit also includes battery protection integrated circuit (integrated circuit, IC),
The control end of the input of battery protection ic and power supply unit is electrically connected, the battery protection ic it is defeated
Go out end and the control end of switching device is electrically connected；The battery protection ic, it is more single for receiving voltage
The control signal that member is sent, and the switch device conductive or disconnection are controlled according to the control signal, to control
The supply access is made to be turned on or off.
Optionally, battery protection ic, is additionally operable to after supply access disconnects lasting preset time period, control
Switch device conductive processed, to turn on supply access of the power supply unit to mainboard.
, can be in power supply unit to the mainboard by battery protection ic in the optional mode of above two
Supply access disconnect after, be delayed preset time period, and be delayed the preset time period after pass through output
Second control signal to turn on supply access of the power supply unit to the mainboard again, to cause power supply single
Member can be again the main board power supply, and then allow the mainboard to restart operation.And pass through this
Battery protection ic, can also detect whether the TV occurs short during battery is the main board power supply
Road, excessively stream or overvoltage, and output first is controlled when short circuit, excessively stream or overvoltage occur for the battery
Signal is to disconnect the supply access for turning on the power supply unit to the mainboard, so as to protect battery.
Optionally, voltage comparison unit is specially comparator.
Optionally, voltage comparison unit includes comparator and phase inverter.
In the optional mode of above two, the voltage and reference voltage of thermistor are compared by comparator
Size, due to the low-loss of comparator, efficientibility, so as to improve the work of the protection circuit
Efficiency.
Optionally, power supply unit also includes buck boost converter, the voltage of the buck boost converter
The positive pole electrical connection of input and battery, the voltage output end of the buck boost converter and the first electricity
Voltage electrical is connected, and the buck boost converter is used to provide stable first voltage.
In this optional mode, power supply unit is enabled to provide stabilization by buck boost converter
First voltage.
Optionally, protection circuit also includes the second pull-up resistor and pull down resistor, voltage comparison unit
One end of second input and second pull-up resistor and one end electrical connection of the pull down resistor, this
The other end of two pull-up resistors is electrically connected with the first voltage, the other end ground connection of the pull down resistor,
Reference voltage is the voltage on the pull down resistor.
In above-mentioned optional embodiment, by set pull-up resistor and pull down resistor resistance it
Than the setting to the size of reference voltage being realized, without setting complicated circuit, so as to simplify electricity
Road.
Second aspect, the embodiment of the present invention provides a kind of mainboard guard method, and the mainboard guard method should
For the protection circuit described in any optional mode of first aspect or first aspect, this method includes：
The voltage of thermistor is detected, and passes through the voltage of the voltage comparison unit thermistor
With the size of reference voltage；
According to comparative result, control power supply unit is switched on or off to the supply access of mainboard.
Mainboard guard method provided in an embodiment of the present invention, by being welded on and the temperature-sensitive electricity on mainboard
Resistance, detects the temperature of the mainboard, can compare the voltage of thermistor and the size of reference voltage in real time
Relation, and power supply unit being turned on or off to the supply access of the mainboard is controlled according to comparative result,
When reaching with the temperature for realizing in mainboard or be up to early warning temperature, power supply unit is disconnected to the master
The supply access of plate, with cause power supply unit no longer be the main board power supply so that avoid mainboard due to
Cause the device damage on the mainboard in the condition of high temperature.
Optionally, disconnect to the power supply unit of main board power supply to the supply access of the mainboard after, the party
Method also includes：
After preset time period, supply access of the power supply unit to the mainboard is turned on.
In this optional mode, when by way of disconnecting supply access of the power supply unit to the mainboard pair
After mainboard in high temperature is protected, moreover it is possible to which power supply of the automatic conducting power supply unit to the mainboard is led to
Road, to cause power supply unit again for the main board power supply.
The third aspect, the embodiment of the present invention provides a kind of terminal, including：
The protection circuit that any optional mode such as above-mentioned first aspect or first aspect is somebody's turn to do.
Terminal provided in an embodiment of the present invention, by the thermistor being welded on mainboard, detection in real time
The temperature of the mainboard, can compare the voltage of thermistor and the magnitude relationship of reference voltage, and according to
Comparative result controls power supply unit being turned on or off to the supply access of the mainboard, to realize in mainboard
Temperature when reaching or being up to early warning temperature, disconnect power supply of the power supply unit to the mainboard and lead to
Road, to cause power supply unit no longer for the main board power supply, so as to avoid mainboard due in high temperature shape
State and cause the device damage on the mainboard.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be right
The accompanying drawing used required in embodiment or description of the prior art is briefly described.
Fig. 1 is a kind of protection circuit figure one provided in an embodiment of the present invention；
Fig. 2 is a kind of protection circuit figure two provided in an embodiment of the present invention；
Fig. 3 is a kind of protection circuit figure three provided in an embodiment of the present invention；
Fig. 4 is a kind of protection circuit figure four provided in an embodiment of the present invention；
Fig. 5 is a kind of protection circuit figure five provided in an embodiment of the present invention；
Fig. 6 is a kind of protection circuit figure six provided in an embodiment of the present invention；
Fig. 7 is a kind of protection circuit figure seven provided in an embodiment of the present invention；
Fig. 8 is a kind of protection circuit figure eight provided in an embodiment of the present invention；
Fig. 9 is a kind of flow chart one of mainboard guard method provided in an embodiment of the present invention；
Figure 10 is a kind of flowchart 2 of mainboard guard method provided in an embodiment of the present invention；
Figure 11 is a kind of terminal provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is entered
Row is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the invention,
Rather than whole embodiments.
It should be noted that in embodiments of the present invention, term " first ", " second ", "
Three " are only used for describing purpose, the different description object for distinguishing, and it is not intended that indicating or dark
Show relative importance or the implicit quantity for indicating indicated technical characteristic.
It should be understood that in embodiments of the present invention, terminal can be referred to as user equipment (User
Equipment, UE), mobile station (Mobile Station, MS), mobile terminal (Mobile
Terminal), computer, microcomputer etc..The terminal can be through wireless access network (Radio Access
Network, RAN) communicated with one or more core nets, for example, terminal can be mobile
Phone (or for " honeycomb " phone), computer with mobile terminal etc., for example, terminal is also
Can be portable, pocket, hand-held, built-in computer or vehicle-mounted mobile device, it
Voice and/or data are exchanged with wireless access network.The present invention is not limited this, and for example terminal is also wrapped
Include the terminal of the access in radio with multiple-bearer feature.
As shown in figure 1, the embodiment of the present invention provides a kind of protection circuit, applied to mainboard, including：
Thermistor 1, the first pull-up resistor 2, voltage comparison unit 3 and power supply unit 4.
One end 20 of first pull-up resistor 2 is electrically connected with thermistor 1, the other end 21 and first
Voltage electric VCC connections.
One end 10 of thermistor 1 and the first pull-up resistor 2, voltage comparison unit 3 it is first defeated
Enter end 30 to be electrically connected, the other end 11 is grounded.
In embodiments of the present invention, thermistor 1 is welded on mainboard, can detect the temperature of mainboard,
Because thermistor 1 has different resistance are shown at thermally sensitive characteristic, different temperature
Value, therefore, the change of the resistance of thermistor 1 can characterize the change of the temperature of the mainboard.The heat
Quick resistance 1 is connected electrically to first voltage VCC by way of being connected with the first pull-up resistor 2,
I.e. the pull-up resistor of thermistor 1 and first is to first voltage VCC partial pressures.
Wherein, thermistor 1 can be negative temperature coefficient (Negative Temperature
Coefficient, NTC) thermistor, or positive temperature coefficient (Positive Temperature
Coefficient, PTC).It is preferred that, in embodiments of the present invention, thermistor 1 is with NTC
Exemplary explanation is carried out exemplified by thermistor.It can be seen from the characteristic of NTC thermistor, when this
When the temperature of NTC thermistor is higher, the resistance of the NTC thermistor is smaller, so that first
In the case that the resistance of pull-up resistor 2 is constant, as temperature is raised, in the NTC thermistor
Voltage diminishes.
Optionally, in embodiments of the present invention, first voltage VCC can be carried by other supply voltages
For can also be by being provided for the power supply unit 4 of the main board power supply.Exemplary, as shown in figure 1,
The positive pole 41 of power supply unit 4 is electrically connected with the first voltage, i.e. first voltage VCC is single for power supply
The voltage that the positive pole 41 of member 4 is exported, the negative pole 42 of power supply unit 4 is grounded.
Further, the first input end 30 of voltage comparison unit 3 is electrically connected with thermistor 1,
The second input 31 and the reference voltage of voltage comparison unit 3 are electrically connected, voltage comparison unit 3
Output end 32 and the control end 40 of power supply unit 4 be electrically connected.
Voltage comparison unit 3, the electricity of the first input end 30 for comparing the voltage comparison unit 3
The size of the voltage of second input 31 of pressure and the voltage comparison unit 3, and according to comparative result,
Send control signal to control the conducting of the supply access of 4 pairs of mainboards of power supply unit to power supply unit 4
Or disconnect.
It is understood that the voltage of the first input end 30 of the voltage comparison unit 3 is temperature-sensitive
Voltage on resistance 1, the voltage of the second input 31 of the voltage comparison unit 3 is with reference to electricity
Pressure.
Wherein, reference voltage can be set according to the characteristic of thermistor 1 and the early warning temperature of mainboard
Put, the early warning temperature of mainboard is the temperature for the device damage being likely to result on the mainboard, i.e., when the mainboard
Temperature when reaching early warning temperature, the device on the mainboard may be burned.
Exemplary, if the thermistor 1 is NTC thermistor, when the temperature of NTC thermistor
When degree reaches the early warning temperature of mainboard, the voltage in the NTC thermistor is second voltage, due to
The temperature of mainboard is higher, and the voltage in NTC thermistor is smaller, then when the temperature of the mainboard is increased to
During the early warning temperature, the voltage in NTC thermistor is decreased to the second voltage.It therefore, it can set
Put the reference voltage more than or equal to the second voltage.
If specifically, setting reference voltage to be more than or equal to the second voltage, when NTC temperature-sensitives
When ohmically voltage is less than or equal to the reference voltage, the voltage in NTC thermistor may be small
(show that the temperature of the mainboard is more than or equal to the early warning temperature, i.e., in or equal to the second voltage
The temperature of the mainboard reaches the early warning temperature), it is also possible to (show the mainboard still greater than the second voltage
Temperature be not increased to early warning temperature also), now, voltage comparison unit is exported for controlling power supply single
The control signal that member disconnects to the supply access of the mainboard, to disconnect the supply access, i.e., in mainboard
When temperature reaches or is up to early warning temperature, supply access is disconnected, to protect the device on mainboard.
It is understood that based on protection circuit provided in an embodiment of the present invention, temperature-sensitive electricity can be compared
The voltage of resistance and the magnitude relationship of reference voltage, and power supply unit is controlled to the mainboard according to comparative result
Supply access be turned on or off, to realize that the temperature in mainboard reaches or be up to early warning temperature
When spending, supply access is disconnected by the hardware circuit, to cause power supply unit no longer for the main board power supply,
So as to avoid mainboard due to causing the device damage on the mainboard in the condition of high temperature.
Further, above-mentioned power supply unit 4 can include switching device and battery 44.
Wherein, the control end of switching device and the output end 32 of voltage comparison unit 3 are electrically connected,
The switching device is connected in the supply access of the battery 44, is sent according to voltage comparison unit 3
Control signal is operated in the state of being turned on or off, to be switched on or off confession of the power supply unit 3 to mainboard
Electric pathway, i.e., when switching device is operated in off-state, the supply access disconnects, and works as switching device
When being operated in conducting state, supply access conducting.
It should be noted that in embodiments of the present invention, switching device can be with switching characteristic
Device, the state of being switched on or off can be operated under control of the control signal.For example, triode,
Metal-oxide-semiconductor etc. has the device of switching function.
It is preferred that, in embodiments of the present invention, using the enhanced metal-oxide-semiconductor of N-channel as switching device,
Carry out exemplary explanation.Specifically, with reference to Fig. 1, as shown in Fig. 2 the drain electrode of metal-oxide-semiconductor 43
430 are electrically connected with the negative pole 440 of battery 44, and the grid 431 of metal-oxide-semiconductor 43 is used as derailing switch
The control end of part, is electrically connected, the source of metal-oxide-semiconductor 43 with the output end 32 of voltage comparison unit 3
Pole 432 is grounded, and the positive pole 441 and first voltage VCC of battery 44 is electrically connected.So as to pass through
The conducting and disconnection of metal-oxide-semiconductor 43 are controlled, to be switched on or off supplying the supply access, that is, works as MOS
When pipe 43 disconnects (i.e. the metal-oxide-semiconductor 43 ends), the supply access disconnects, when metal-oxide-semiconductor 43
During conducting, supply access conducting.
Specifically, in embodiments of the present invention, due to the cut-in voltage of the enhanced metal-oxide-semiconductor of N-channel
More than low level, therefore, when the grid 431 of the metal-oxide-semiconductor 43 receives low level, the MOS
Pipe 43 disconnects, when the grid 431 of the metal-oxide-semiconductor 43 receives high level, the metal-oxide-semiconductor 43
Conducting.So as to when thermistor is NTC thermistor, if the temperature of mainboard is less than early warning temperature,
The then voltage (voltage i.e. on thermistor 1) of the first input end 30 of the voltage comparison unit 3,
More than the voltage (i.e. reference voltage) of the second input 31 of the voltage comparison unit 3, the voltage
The control signal that the output end 32 of comparing unit 3 is exported is high level, the grid of the metal-oxide-semiconductor 43
431 are received after high level, and the metal-oxide-semiconductor 43 is turned on, so that the supply access is turned on, to cause
The mainboard normal work.If the temperature of the mainboard reaches or is up to early warning temperature, the voltage
The voltage of the first input end 30 of comparing unit 3 is less than or equal to or the voltage comparison unit 3
The voltage of second input 31, the control signal that the output end 32 of the voltage comparison unit 3 is exported is
Low level, the grid of the metal-oxide-semiconductor 43 is received after low level, and the metal-oxide-semiconductor 43 disconnects, from
And the supply access disconnects, reached with the temperature in the mainboard or be up to early warning temperature, protected
The mainboard.
Optionally, with reference to Fig. 2, protected as shown in figure 3, above-mentioned power supply unit 4 can also include battery
Protect IC 45.
The input 452 of battery protection ic 45 is electrically connected with the control end 40 of power supply unit 4,
The output end 453 of battery protection ic 45 is electrically connected with the control end of switching device.
Battery protection ic 45, the control signal sent for receiving voltage comparing unit 3, and according to
The control signal controlling switch break-over of device or disconnection, to control supply access to be turned on or off.
Further, the positive pole 441 that the power end 450 of the battery protection ic 45 can be with battery 44
Electrical connection, the earth terminal 451 of the battery protection ic 45 electrically connects with the negative pole 440 of battery 44
Connect, to cause the battery 44 to be powered for the battery protection ic 45.
It should be noted that in embodiments of the present invention, when battery protection ic 45 receives high level
Meeting controlling switch device disconnects, therefore, when the electricity of the first input end 30 of the voltage comparison unit 3
Press (voltage i.e. in NTC thermistor 1), less than or equal to the of the voltage comparison unit 3
During voltage (i.e. the reference voltage) of two inputs 31, the output end 32 of the voltage comparison unit 3
High level can be exported.The input 452 of the battery protection ic 45 is received after high level, the battery
IC 45 is protected to export low level by its output end 453, metal-oxide-semiconductor 43 disconnects, supply access breaks
Open.
Optionally, with reference to Fig. 3, as shown in figure 4, above-mentioned voltage comparison unit 3 can be comparator
33。
Specifically, the one end of the inverting input 331 of the comparator 33 respectively with the thermistor 1
10 and first one end 20 of pull-up resistor 2 be electrically connected, the normal phase input end 330 of the comparator 33
With reference voltage be electrically connected, the output end 332 of the comparator 33 with the battery protection ic 45
Input 452 be electrically connected.
When the temperature of mainboard is raised, and causes the voltage of thermistor 1 less than or equal to reference voltage,
I.e. the comparator 33 determines that the voltage of its inverting input 331 is less than or equal to its normal phase input end
During 330 voltage, the output high level of output end 332 of the comparator 33, battery protection ic 45
Input 452 receive after high level, export low from the output end 453 of the battery protection ic 45
Level, after the grid 431 of metal-oxide-semiconductor 43 receives low level, the metal-oxide-semiconductor 43 disconnects,
So as to which the supply access disconnects, it is to avoid mainboard is because temperature is raised and causes the component on the mainboard
Damage.
Optionally, with reference to Fig. 3, as shown in figure 5, above-mentioned voltage comparison unit 3 can include comparing
Device 33 and phase inverter 34.
Specifically, the one end of the normal phase input end 330 of the comparator 33 respectively with the thermistor 1
10 and first one end 20 of pull-up resistor 2 be electrically connected, the inverting input 331 of the comparator 33
It is electrically connected with reference voltage, the output end 332 of the comparator 33 and the input of the phase inverter 34
End 340 is electrically connected, the output end 341 of the phase inverter 34 and the input of the battery protection ic 45
End 452 is electrically connected.
Exemplary, as shown in figure 5, in the present embodiment, the phase inverter 34 can be non-for one
Door, when the temperature of mainboard is raised, and causes the voltage of thermistor 1 less than or equal to reference voltage,
I.e. the comparator 33 determines that the voltage of its normal phase input end 330 is less than or equal to its inverting input
During 331 voltage, the output low level of output end 332 of the comparator 33.NOT gate receives low electricity
After flat, the low level is negated to form high level, and exported the high level as the first control signal,
The input 452 of battery protection ic 45 is received after high level, from the defeated of the battery protection ic 45
Go out end 453 and export low level, should after the grid 431 of the metal-oxide-semiconductor 43 receives low level
Metal-oxide-semiconductor 43 disconnects, so that the supply access disconnects, it is to avoid mainboard is due in the condition of high temperature
Cause the device damage on the mainboard.Further, it is to be understood that battery protection ic 45 is straight
Connect in parallel with battery 44, directly powered by battery 44 for battery protection ic 45, therefore, in battery
In the case that 44 have electricity, the battery protection ic 45 remains working condition.So that in this example,
When the controlling switch device of battery protection ic 45 disconnects, to control the supply access to disconnect preset time
Duan Hou, the battery protection ic 45 can control the switch device conductive, to control the supply access to lead
It is logical so that the power supply unit is the main board power supply again.
Specifically, with reference to protection circuit as shown in Figure 5, after the supply access disconnects preset time period,
The battery protection ic 45 can export high level, and the grid 431 of metal-oxide-semiconductor 43 receives high electricity
After flat, the metal-oxide-semiconductor 43 is turned on again, so that the supply access is turned on, make it that the mainboard can
To restart operation.
It should be understood that based on Fig. 5, after the supply access of 4 pairs of mainboards of power supply unit disconnects,
Voltage comparison unit 3 is stopped, and the output end 32 of the voltage comparison unit 3 will not output signal.
So as to which the battery protection ic 45 may also detect that the input 452 of the battery protection ic 45 is
No to have signal input, when no signal is inputted, the battery protection ic 45 can start timing, and
After timing reaches preset time period, the controlling switch break-over of device of battery protection ic 45, to lead again
Lead to the supply access of 4 pairs of mainboards of power supply unit.
Wherein, preset time period can be needed according to actual design adjustment, for example, be set to 5 seconds,
2 seconds etc., to cause the power supply unit to be turned on automatically after being disconnected to the supply access of the mainboard, by
Power supply unit is the main board power supply again.
It is understood that compared to protection circuit as shown in Figure 2, described in the embodiment of the present invention
Protection circuit can be protected by disconnecting power supply unit to the supply access of the mainboard to the mainboard
After shield, additionally it is possible to turn on supply access of the power supply unit to the mainboard automatically after preset time period,
The mainboard is allowd to restart operation.
And in the present embodiment, the battery protection ic 45 is also equipped with protecting the effect of battery, for example,
The battery protection ic 45 can judge the electricity by detecting electric current of battery when to main board power supply
Pond whether excessively stream or short circuit, by detecting the voltage that the battery is produced when to main board power supply, judge
Whether the battery is over-pressed, then can also controlling switch device in the battery short circuit, excessively stream or overvoltage
Part disconnects, to disconnect the supply access of 4 pairs of mainboards of power supply unit, so as to protect battery.
Optionally, with reference to Fig. 2, as shown in fig. 6, the voltage comparison unit 3 is comparator 33.
Specifically, the one end 10 of the first input end 330 of comparator 33 respectively with thermistor 1
Be electrically connected with one end 20 of the first pull-up resistor 2, the second input 331 of comparator 33 with
Reference voltage is electrically connected, and the output end 332 of comparator 33 electrically connects with the control end of switching device
Connect, the comparator 33 is used for the voltage and the ratio for comparing the first input end 330 of the comparator 33
Compared with the size of the voltage of the second input 331 of device 33, and according to comparative result, from the comparator
33 output control signal of output end 332.
Exemplary, in present example, the control exported due to switching device by comparator 33
Signal control is turned on or off, therefore, if switching device is to be controlled to turn on by high level, low level control
The switching device disconnected is made, then the first input end 330 of the comparator 43 is normal phase input end, than
The second input 331 compared with device 33 is inverting input；If switching device is to be led by low level control
It is logical, the switching device that high level control disconnects, then the first input end 330 of the comparator 43 is anti-
Phase input, the second input 331 of comparator 33 is normal phase input end.
Exemplary, as shown in fig. 6, switching device is the i.e. enhanced metal-oxide-semiconductor 43 of N-channel,
Control to turn on for high level, the switching device that low level control disconnects, the first input of comparator 33
End 330 is normal phase input end, and the second input 331 of comparator 33 is inverting input, so that
When the voltage (voltage i.e. on thermistor) of the normal phase input end of comparator 33 is less than or equal to
During voltage (i.e. the reference voltage) of the inverting input of comparator 33, the output end of comparator 33
332 output low levels.After the grid 431 of metal-oxide-semiconductor 43 receives low level, the metal-oxide-semiconductor
Disconnect, the supply access disconnects, so as to avoid mainboard due to causing the mainboard in the condition of high temperature
On device damage.
Optionally, with reference to Fig. 5, converted as shown in fig. 7, the power supply unit 4 also includes buck-boost
Device 46.
The voltage input end 461 of buck boost converter 46 and the positive pole 441 of battery 44 electrically connect
Connect, the voltage output end 462 and first voltage VCC of buck boost converter 46 is electrically connected.
It is exemplary, as shown in fig. 7, the Enable Pin 460 of voltage raising and reducing converter 46 can also be with
The positive pole 441 of battery 44 is electrically connected, and activating the voltage raising and reducing by the output voltage of battery 44 becomes
Parallel operation 46.
In the present embodiment, it ensure that power supply unit 4 is exported by the buck boost converter 46
Stable first voltage VCC, so that avoid due to the unstable situation that cell voltage is likely to occur,
Cause when the temperature of mainboard is in normal range (NR), the output control supply access of voltage comparison unit 3 breaks
The control signal opened so that the supply access disconnects, and causes mainboard to be stopped.
Further, with reference to Fig. 7, as shown in figure 8, the protection circuit also includes the second pull-up resistor
5 and pull down resistor 6.
The one end of the inverting input 331 of the voltage comparison unit 3 respectively with second pull-up resistor 5
50 and one end 60 of the pull down resistor 6 be electrically connected, i.e., as shown in fig. 7, the voltage comparison unit
The inverting input 331 of comparator 33 in 3 respectively with one end 50 of second pull-up resistor 5 and
One end 60 of the pull down resistor 6 is electrically connected, the other end 51 and first of second pull-up resistor 5
Voltage VCC is electrically connected, and the other end 61 of the pull down resistor 6 is grounded, and the reference voltage is under this
Voltage in pull-up resistor 6.
In embodiments of the present invention, reference voltage can be produced by first voltage VCC partial pressures, be passed through
Adjust the resistance of the second pull-up resistor 5 and the resistance of pull down resistor 6 sets reference voltage.For example, working as
When first voltage VCC is provided by power supply unit, if the voltage that the positive pole 41 of power supply unit 4 is exported
Size is 5 volts (v), then when the temperature of mainboard is increased to early warning temperature, i.e. NTC thermistor
Temperature when reaching the early warning temperature, the voltage in the NTC thermistor is 2.5v, the then reference
Voltage could be arranged to be more than or equal to 2.5v.If desired by reference voltage to be set to 2.5v, then
The resistance of second pull-up resistor 5 and the resistance of pull down resistor 6 can be 1:1, so that the drop-down
The voltage (i.e. reference voltage) of resistance is 5v half, i.e. 2.5v.
Protection circuit provided in an embodiment of the present invention, by the temperature of thermistor, in real time detection mainboard,
The voltage of thermistor and the magnitude relationship of reference voltage can be compared, and confession is controlled according to comparative result
Electric unit is turned on or off to the supply access of mainboard, is reached with the temperature for realizing in mainboard or i.e.
When being up to early warning temperature, supply access of the power supply unit to mainboard is disconnected by hardware circuit, so that
It is no longer the main board power supply to obtain power supply unit, so as to avoid mainboard due to causing in the condition of high temperature
Device damage on the mainboard.
It should be noted that protection circuit provided in an embodiment of the present invention is realized for hardware, without using
The mainboard (or terminal) of the protection circuit carries out software control, therefore, even if terminal is in shutdown
Or the state crashed, by protection circuit provided in an embodiment of the present invention, it can be also in mainboard
During the condition of high temperature, power-off protection is carried out to it.
As shown in figure 9, the embodiment of the present invention provides a kind of mainboard guard method, applied to scheming as described above
1 to Fig. 8 any shown protection circuit, this method includes：
S101, the voltage for detecting thermistor, and the thermistor is compared by voltage comparison unit
The size of voltage and reference voltage.
It should be noted that mainboard guard method provided in an embodiment of the present invention, can be performed by mainboard,
Can also by including the protection circuit terminal perform, can also by with the mainboard electric linkage function mould
Block is performed.
S102, according to comparative result, conducting or disconnected of the control power supply unit to the supply access of mainboard
Open.
For example, by taking terminal as an example, the terminal can send control signal to the power supply unit, to control
Switching device in the power supply unit is turned on or off, so as to control the power supply unit to the mainboard
Supply access is switched on or off.Concrete mode may refer in embodiment as shown in Figures 2 to 5
Description, here is omitted.
Wherein, the description to the thermistor and reference voltage may refer to such as any one of Fig. 1 to Fig. 8
In described protection circuit, the description to thermistor and reference voltage, here is omitted.
Mainboard guard method provided in an embodiment of the present invention, by being welded on and the temperature-sensitive electricity on mainboard
Resistance, detects the temperature of the mainboard, can compare the voltage of thermistor and the size of reference voltage in real time
Relation, and power supply unit being turned on or off to the supply access of the mainboard is controlled according to comparative result,
When reaching with the temperature for realizing in mainboard or be up to early warning temperature, power supply unit is disconnected to the master
The supply access of plate, with cause power supply unit no longer be the main board power supply so that avoid mainboard due to
Cause the device damage on the mainboard in the condition of high temperature.
Further, with reference to Fig. 9, as shown in Figure 10, after above-mentioned S102, this method also includes：
S103, when the supply access disconnect preset time period after, turn on the supply access.
In this example, when by disconnecting power supply unit to the supply access of the mainboard in high temperature
After mainboard is protected, moreover it is possible to supply access of the power supply unit to the mainboard is turned on automatically, to cause
Power supply unit is the main board power supply again.
As shown in figure 11, the embodiment of the present invention provides a kind of terminal, and the terminal can be mobile phone, put down
Plate computer, notebook computer or the other-end including mainboard.The terminal includes such as Fig. 1 to Fig. 8
Protection circuit shown in any.
Wherein, the protection circuit can be integrated on the mainboard of the terminal, or pass through the temperature-sensitive
The circuit module that resistance is electrically connected with the mainboard.
Specifically, the specific descriptions to the protection circuit may refer to as described in Fig. 1 to Fig. 8 is any
Description in embodiment, to avoid repeating, here is omitted.
Terminal provided in an embodiment of the present invention, by the thermistor being welded on mainboard, detection in real time
The temperature of the mainboard, can compare the voltage of thermistor and the magnitude relationship of reference voltage, and according to
Comparative result controls power supply unit being turned on or off to the supply access of the mainboard, to realize in mainboard
Temperature when reaching or being up to early warning temperature, disconnect power supply of the power supply unit to the mainboard and lead to
Road, to cause power supply unit no longer for the main board power supply, so as to avoid mainboard due in high temperature shape
State and cause the device damage on the mainboard.
It is apparent to those skilled in the art that, for convenience and simplicity of description, only with
The division progress of above-mentioned each functional module, can as needed will be upper for example, in practical application
State function distribution to be completed by different functional modules, i.e., the internal structure of device is divided into different work(
Energy module, to complete all or part of function described above.The system of foregoing description, device and
The specific work process of unit, may be referred to the corresponding process in preceding method embodiment, herein no longer
Repeat.
The magnitude of voltage magnitude relationship and the high low state of logic level provided in embodiments of the invention
A kind of simply realization of the embodiment of the present invention, what each parameter value can be appropriate according to progress the need for circuit
Adjustment.
In several embodiments provided herein, it should be understood that disclosed system, device
And method, it can realize by another way.For example, device embodiment described above is only
It is schematical, for example, the division of the module or unit, only a kind of division of logic function,
There can be other dividing mode when actually realizing, such as multiple units or component can combine or can
To be integrated into another system, or some features can be ignored, or not perform.It is another, it is shown
Or the coupling each other discussed or direct-coupling or communication electrical connection can be connect by some
Mouthful, the INDIRECT COUPLING or communication electrical connection of device or unit.
The unit illustrated as separating component can be or may not be it is physically separate,
The part shown as unit can be or may not be physical location, you can with positioned at a ground
Side, or can also be distributed on multiple NEs.It can select therein according to the actual needs
Some or all of unit realizes the purpose of this embodiment scheme.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit
In or unit be individually physically present, can also two or more units be integrated in
In one unit.Above-mentioned integrated unit can be realized in the form of SFU software functional unit.
If the integrated unit is realized using in the form of SFU software functional unit and is used as independent product
Sale in use, can be stored in a non-volatile computer read/write memory medium.It is based on
Such to understand, all or part of the technical scheme can be embodied in the form of software product,
The computer software product is stored in a storage medium, including some instructions are to cause a meter
Calculate machine equipment (can be personal computer, server, or network equipment etc.) or computing device
The all or part of step of each embodiment methods described of the invention.The storage medium is non-transitory
(non-transitory) medium, including：Flash memory, mobile hard disk, read-only storage, with
Machine access memory, magnetic disc or CD etc. are various can be with the medium of store program codes.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention not office
Be limited to this, any one skilled in the art the invention discloses technical scope in, can
Change or replacement are readily occurred in, should be all included within the scope of the present invention.Therefore, it is of the invention
Protection domain described should be defined by scope of the claims.
Claims (10)
1. a kind of protection circuit, it is characterised in that including：Thermistor, the first pull-up resistor, voltage comparison unit and power supply unit；
One end of first pull-up resistor is electrically connected with the thermistor, and the other end is electrically connected with first voltage；
One end of the thermistor and the first input end of first pull-up resistor, the voltage comparison unit are electrically connected, other end ground connection；
The first input end of the voltage comparison unit is electrically connected with the thermistor, and the second input and the reference voltage of the voltage comparison unit are electrically connected, and the output end of the voltage comparison unit and the control end of said supply unit are electrically connected；
The voltage comparison unit, size for comparing the voltage of the first input end and the voltage of second input, and send control signal to control said supply unit being turned on or off to the supply access of the mainboard to said supply unit according to comparative result.
2.According to claimProtection circuit described in 1, it is characterised in that said supply unit includes switching device and battery,
The control end of the switching device and the control end of said supply unit are electrically connected, the switching device is serially connected in the supply access of the battery, the state of being turned on or off is operated according to the control signal that the voltage comparison unit is sent, with the supply access that is turned on or off.
3.According to claimProtection circuit described in 2, it is characterised in that said supply unit also includes battery protection integrated circuit,
The input of the battery protection integrated circuit and the control end of said supply unit are electrically connected, and the output end of the battery protection integrated circuit and the control end of the switching device are electrically connected；
The battery protection integrated circuit, controls the switch device conductive or disconnection, to control the supply access to be turned on or off for receiving the control signal that the voltage comparison unit is sent, and according to the control signal.
4.According to claimProtection circuit described in 3, it is characterised in that
The battery protection integrated circuit, is additionally operable to after the supply access disconnects lasting preset time period, the switch device conductive is controlled, to turn on supply access of the said supply unit to the mainboard.
5.According to claimProtection circuit described in 2, it is characterised in that the voltage comparison unit is specially comparator.
6.According to claimProtection circuit described in any one of 2-5, it is characterised in that said supply unit also includes buck boost converter,
The positive pole electrical connection of the voltage input end of the buck boost converter and the battery, the voltage output end of the buck boost converter is electrically connected with the first voltage, and the buck boost converter is used to provide the stable first voltage.
7. the protection circuit according to claim any one of 1-6, it is characterised in that the protection circuit also includes the second pull-up resistor and pull down resistor,
Second input of the voltage comparison unit is connected with one end of second pull-up resistor and one end of the pull down resistor, the other end of second pull-up resistor is connected with the first voltage, the other end ground connection of the pull down resistor, the reference voltage is the voltage of the pull down resistor.
8. a kind of mainboard guard method, it is characterised in that the mainboard guard method is applied to such asClaimProtection circuit described in 1 to 7 any one, methods described includes：
Detect the voltage of thermistor, and voltage and the size of reference voltage by the voltage comparison unit thermistor；
According to comparative result, control power supply unit is switched on or off to the supply access of mainboard.
9.According to claimMainboard guard method described in 8, it is characterised in that methods described also includes：
After the supply access disconnects preset time period, the supply access is turned on.
10. a kind of terminal, it is characterised in that including：
Such asClaimProtection circuit described in any one of 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610286819.8A CN107332208B (en) | 2016-04-29 | 2016-04-29 | A kind of protection circuit, mainboard guard method and terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610286819.8A CN107332208B (en) | 2016-04-29 | 2016-04-29 | A kind of protection circuit, mainboard guard method and terminal |
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| CN107332208A true CN107332208A (en) | 2017-11-07 |
| CN107332208B CN107332208B (en) | 2019-08-27 |
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|---|---|---|---|
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| CN109193562A (en) * | 2018-10-18 | 2019-01-11 | 郑州云海信息技术有限公司 | A kind of thermal-shutdown circuit and generic server of server master board |
| CN109327012A (en) * | 2018-09-21 | 2019-02-12 | 郑州云海信息技术有限公司 | A kind of the protection circuit and server of mainboard |
| CN110955315A (en) * | 2018-09-27 | 2020-04-03 | 西安中兴新软件有限责任公司 | Electronic device, control method and computer storage medium thereof |
| CN111614138A (en) * | 2020-05-25 | 2020-09-01 | 维沃移动通信有限公司 | Interface protection circuit and electronic equipment |
| CN111781878A (en) * | 2020-07-15 | 2020-10-16 | 济南浪潮高新科技投资发展有限公司 | Method for realizing measurement and control board card based on network interface |
| CN111835069A (en) * | 2020-07-24 | 2020-10-27 | 维沃移动通信有限公司 | Charging device |
| CN112865726A (en) * | 2021-01-21 | 2021-05-28 | 维沃移动通信有限公司 | Power amplification circuit and electronic device |
| CN113949129A (en) * | 2021-10-20 | 2022-01-18 | 安徽淘云科技股份有限公司 | Charging interface protection device of electronic equipment and electronic equipment |
| CN117826965A (en) * | 2024-03-05 | 2024-04-05 | 深圳市智仁科技有限公司 | Method, device, equipment and storage medium for protecting voltage of main board |
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| CN117826965A (en) * | 2024-03-05 | 2024-04-05 | 深圳市智仁科技有限公司 | Method, device, equipment and storage medium for protecting voltage of main board |
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| CN107332208B (en) | 2019-08-27 |
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