CN104092181B - A kind of protection circuit of power management chip - Google Patents
A kind of protection circuit of power management chip Download PDFInfo
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- CN104092181B CN104092181B CN201410346866.8A CN201410346866A CN104092181B CN 104092181 B CN104092181 B CN 104092181B CN 201410346866 A CN201410346866 A CN 201410346866A CN 104092181 B CN104092181 B CN 104092181B
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Abstract
The invention discloses the protection circuit of power management chip, the power management chip is used for each functional module and I of mobile terminal2C signal is powered, and described protection circuit includes：For the Voltage stabilizing module of the voltage of stabilized power source managing chip output；For as the I of mobile terminal2When C signal line produces current impulse, the protection module that blocking current impulse passes through power line input power managing chip；The input connection power management chip of the Voltage stabilizing module, the output end of Voltage stabilizing module connects described each functional module and I by the protection module2C signal line.The present invention provide protection circuit, by Voltage stabilizing module stabilized power source managing chip export voltage, and by protection module mobile terminal I2When C signal line produces current impulse, blocking current impulse passes through power line input power managing chip, so as in each functional module and I of mobile terminal2During C signal job insecurity, prevent from causing the damage to power management chip.
Description
Technical field
The present invention relates to the circuit design technique of electronic product, more particularly to a kind of protection circuit of power management chip.
Background technology
At present, widely, it gives each of mobile terminal for the application of the voltage signal of power management chip output 1.8V
Functional module and I2C signal is powered.Because each functional module of mobile terminal is in debugging stage job insecurity, 1.8V can be influenceed
, then can there is unstable current signal in supply voltage job stability, the current signal passes through on 1.8V power supplies line
The power line of 1.8V enters power management chip, and power management chip can be caused to damage.
Each functional module of the mobile terminals such as mobile phone is by I2C signal controls it to communicate, and is exported by power management chip
The voltage signal of 1.8V is to I2C signal is powered.When mobile phone is debugged, it is necessary to draw the I of mobile phone2The SDA data wire sizes of C signal line
With the working condition of the SCL clock signal check signal.In mobile phone debugging and test phase, I2C signal job insecurity and
It is more easily damaged, causes the voltage signal job insecurity of 1.8V, the current impulse that can be produced on the power line of 1.8V, and lead to
Cross power line to enter in power management chip, power management chip is caused to damage.
The content of the invention
In view of above-mentioned the deficiencies in the prior art part, it is an object of the invention to provide a kind of protection of power management chip
Circuit, can be in each functional module and I of mobile terminal2During C signal job insecurity, prevent from causing to power management chip
Damage.
In order to achieve the above object, this invention takes following technical scheme：
A kind of protection circuit of power management chip, the power management chip is used for each function mould of mobile terminal
Block and I2C signal is powered, and it includes：
For the Voltage stabilizing module of the voltage of stabilized power source managing chip output；
For as the I of mobile terminal2When C signal line produces current impulse, blocking current impulse is input into electricity by power line
The protection module of source control chip；
The input connection power management chip of the Voltage stabilizing module, the output end of Voltage stabilizing module is by the protection module
Described each functional module of connection and I2C signal line.
In the protection circuit of described power management chip, the Voltage stabilizing module includes：Voltage regulation unit, pull-up power supply unit
And partial pressure unit, the first input end of the voltage regulation unit is by pulling up power supply unit connection power management chip, the voltage stabilizing
Second input of unit connects the first end of partial pressure unit, and the output end of voltage regulation unit connects the second end of partial pressure unit.
In the protection circuit of described power management chip, the protection module is included for sensing I2C signal line is produced
The electric current of current pulse signal is sensed and compares control unit and managed by power line input power for blocking current impulse
The switch control unit of chip；The electric current senses and compares the output end of control unit connection voltage regulation unit, also passes through switch
Each functional module and I of control unit connection mobile terminal2C signal line.
In the protection circuit of described power management chip, the voltage regulation unit includes operational amplifier, the first triode
With the second triode, the pull-up power supply unit include first resistor, the partial pressure unit include second resistance and 3rd resistor；
The in-phase input end of the operational amplifier connects power management chip, the inverting input of operational amplifier by first resistor
One end of second resistance and one end of 3rd resistor are connected, the output end of the operational amplifier connects the base of the first triode
Pole；The colelctor electrode of the colelctor electrode of the first triode and the second triode connects the power management chip, the hair of the first triode
Emitter-base bandgap grading connects the base stage of the second triode, and the emitter stage of the second triode connects the other end and protection module of second resistance, the
The other end ground connection of three resistance.
In the protection circuit of described power management chip, the Voltage stabilizing module also includes voltage-regulator diode, the voltage stabilizing
The in-phase input end of the negative pole concatenation operation amplifier of diode, the plus earth of voltage-regulator diode.
In the protection circuit of described power management chip, the Voltage stabilizing module also includes the first filter capacitor and the second filter
Ripple electric capacity；One end of first filter capacitor connects power management chip, the colelctor electrode of the first triode and the second triode
Colelctor electrode, also by the in-phase input end of first resistor concatenation operation amplifier, the other end of the first filter capacitor ground connection；Institute
The one end for stating the second filter capacitor connects the emitter stage of the second triode, the other end of second resistance and electric current sensing and compares control
Unit processed, the other end ground connection of second filter capacitor.
In the protection circuit of described power management chip, electric current sensing and compare control unit including comparator,
4th resistance, the 5th resistance and the 6th resistance；The first end of the in-phase input end connecting valve control unit of the comparator, also
One end of the 4th resistance and the emitter stage of the second triode, the inverting input connecting valve of comparator are connected by the 5th resistance
3rd end at the second end of control unit, the other end that the 4th resistance is also connected by the 6th resistance and switch control unit, institute
The 4th end of the output end connecting valve control unit of comparator is stated, the 5th end of switch control unit connects each of mobile terminal
Individual functional module.
In the protection circuit of described power management chip, the switch control unit includes the 3rd triode, the four or three
Pole pipe, the 5th triode and the 7th resistance；The output end of the comparator connects the base stage and the 4th triode of the 3rd triode
Base stage, the colelctor electrode of the 3rd triode connects the in-phase input end of comparator, the emitter stage connection the four or three of the 3rd triode
The colelctor electrode of pole pipe；The colelctor electrode of four triode connects the base stage of the 5th triode, also passes through the 7th resistance eutral grounding, described
The inverting input of the transmitting collection connection comparator of the 4th triode；The colelctor electrode of the 5th triode connects the 4th resistance
The other end, the emitter stage of the 5th triode connects each functional module of mobile terminal.
In the protection circuit of described power management chip, the first triode, the second triode, the 3rd triode and the 5th
Triode is NPN triode, and the 4th triode is PNP triode.
The protection circuit of the power management chip provided compared to prior art, the present invention, by Voltage stabilizing module stabilized power source
Managing chip output voltage, and by protection module mobile terminal I2When C signal line produces current impulse, electric current is blocked
Pulse passes through power line input power managing chip, so as in each functional module and I of mobile terminal2C signal job insecurity
When, prevent from causing the damage to power management chip.
Brief description of the drawings
Fig. 1 is the structured flowchart of the protection circuit of power management chip of the present invention.
Fig. 2 is the circuit diagram of the protection circuit of power management chip of the present invention.
Specific embodiment
The present invention provides a kind of protection circuit of power management chip, to make the purpose of the present invention, technical scheme and effect
Clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should be appreciated that this place is retouched
The specific embodiment stated only is used to explain the present invention, is not intended to limit the present invention.
In the mobile terminals such as mobile phone, power management chip is commonly used to each functional module and I of mobile terminal2C
It is signal-powered, because each functional module of mobile phone is in debugging stage job insecurity, influence power management chip output
The stability of 1.8V supply voltages work, can make the presence of unstable current signal on 1.8V supply voltage lines, the current signal
Power management chip is entered by the power line of 1.8V, power management chip can be caused to damage.The present invention is by functional module
Job insecurity, makes supply voltage stabilization in 1.8V, prevents the destruction to power management chip.
Also, each functional module of mobile phone is by I2C signal controls it to communicate, the 1.8V electricity of power management chip output
Pressure signal also gives I2C signal is powered.In mobile phone debugging and test phase, if I2C signal job insecurity, can cause 1.8V
Voltage signal power supply instability, can be in the voltage signal line of 1.8V（That is the power supply line of power management chip outlet side）Upper product
Raw current impulse, the current impulse can be entered in power management chip by the power line of power management chip, cause power supply
The destruction of managing chip.The present invention is detected and processed by the current signal on 1.8V holding wires, it is ensured that unstable
The current impulse that power supply signal is produced will not cause to damage by power line to power management chip.
Fig. 1 is referred to, the protection circuit of the power management chip that the present invention is provided includes Voltage stabilizing module 10 and protection module
20, the input connection power management chip of the Voltage stabilizing module 10, the output end of Voltage stabilizing module 10 is by the protection module
Described each functional module of 20 connections and I2C signal line.
The Voltage stabilizing module 10 is used for the voltage of stabilized power source managing chip output, and protection module 20 is used to work as mobile terminal
I2When C signal line produces current impulse, blocking current impulse is realized at each by power line input power managing chip
Functional module job insecurity, and I2When C signal produces current impulse, prevent from that power management chip is caused to damage.
Wherein, the Voltage stabilizing module 10 includes：Voltage regulation unit 101, pull-up power supply unit 102 and partial pressure unit 103, it is described
The first input end of voltage regulation unit 101 connects power management chip by pulling up power supply unit 102, the voltage regulation unit 101
Second input connects the first end of partial pressure unit 103, and the output end of voltage regulation unit 101 connects the second end of partial pressure unit 103,
The voltage of partial pressure unit 103 of being sampled by voltage regulation unit 101, in the voltage reduction of partial pressure unit 103, makes voltage regulation unit 101
Output voltage suitably increases, and when the voltage of partial pressure unit 103 increases, the output voltage of voltage regulation unit 101 is suitably reduced, finally
Ensure the stability of 1.8V supply voltages.
The protection module 20 includes that electric current senses and compare control unit 201 and switch control unit 202, the electric current
Sense and compare the output end of the connection voltage regulation unit 101 of control unit 201, also connect mobile whole by switch control unit 202
Each functional module and I at end2C signal line.Wherein, the electric current senses and compares control unit 201 for sensing I2C signal
Line produces current pulse signal, and switch control unit 202 is for blocking current impulse by power line input power managing chip
In.
Also referring to Fig. 2, during specific implementation, the voltage regulation unit 101 includes operational amplifier A 1, the first triode Q1
With the second triode Q2, the pull-up power supply unit 102 include first resistor R1, the partial pressure unit 103 include second resistance
R2 and 3rd resistor R3.The first resistor R1 is pull-up resistor, and the 3rd resistor R3 is sample resistance, for power supply pipe
Manage the output voltage sampling of chip.
The in-phase input end of the operational amplifier A 1 is the first input end of voltage regulation unit 101, and it passes through first resistor
R1 connects power management chip, and the inverting input of operational amplifier A 1 is the second input of voltage regulation unit 101, its connection the
One end of two resistance R2 and one end of 3rd resistor R3, the output end of the operational amplifier A 1 connect the base of the first triode Q1
Pole；The colelctor electrode of the colelctor electrode of the first triode Q1 and the second triode Q2 connects the power management chip, the first triode
The emitter stage of Q1 connects the base stage of the second triode Q2, the other end of the emitter stage connection second resistance R2 of the second triode Q2 and
Protection module 20, the other end ground connection of 3rd resistor R3.
In the present embodiment, power management chip uses model PM8038 integrated chips, the first triode Q1 and the
Two triode Q2 are NPN triode, according to the current characteristics of triode：Collector current Ic=βIb=emitter current Ie。
By taking mobile phone as an example, in test and debugging, the voltage signal PM8038_ of the 1.8V exported by power management chip
Each functional module and I of 1.8V_OUTPUT to mobile phone2C signal is powered, in the debugging stage of mobile phone its functional module and I2C believes
Number job insecurity, the stability of influence 1.8V supply voltage work, then need to stablize the supply voltage signal PM8038_ of 1.8V
1.8V_OUTPUT。
In Voltage stabilizing module of the invention 10, when unstable power supply occurs in the voltage signal of 1.8V, if output voltage
Signal increases, then the pressure drop increase on the 3rd resistor R3 in partial pressure unit 103, then the inverting input of operational amplifier A 1
Comparison voltage signal increases, and now the inverting input comparison voltage signal of operational amplifier A 1 is electric with the benchmark of in-phase input end
The difference of signal is pressed to reduce, then the output current reduction of operational amplifier A 1, the output current signal is used for adjusting the one or three pole
The pressure drop of pipe Q1 and the second triode Q2.
Due to the output current reduction of now operational amplifier A 1, then the current signal drives the driving of the base stage of triode
Current reduction, according to the current characteristics of triode：Due to base current IbReduce, then IcReduce, IeReduce, then the collection of triode
The pressure drop reduction of electrode and emitter stage, the pipe step-down according to triode subtracts colelctor electrode pressure drop and the hair of triode for supply voltage
Emitter voltage drop, and the pressure drop of transistor collector now and the pressure drop of emitter stage reduce, then the tube voltage drop of triode increases, then
The output voltage reduction of triode.So will not increase output voltage because of the supply voltage of 1.8V is unstable, it is ensured that 1.8V
The stability of supply voltage.
If output voltage signal reduction, the pressure drop on the 3rd resistor R3 in partial pressure unit 103 reduces, operation amplifier
The comparison voltage signal of the inverting input of device A1 reduces, now the comparison voltage signal of inverting input and in-phase input end
The difference of reference voltage signal increases, then the output current increase of operational amplifier A 1.Due to the output electricity of operational amplifier A 1
Stream increase, then the ideal base drive current increase of current signal driving triode, according to the current characteristics of triode, due to base stage
Electric current IbIncrease, then IcIncrease, IeIncrease, then the pressure drop of transistor collector and the pressure drop of emitter stage increases.Due to triode
Pipe step-down subtracts colelctor electrode pressure drop and the emitter voltage drop of triode, the pressure drop of present transistor collector for power supply voltage signal
Pressure drop with emitter stage increases, then the tube voltage drop reduction of triode, then the output voltage of triode increases.So will not be because of
The supply voltage of 1.8V is unstable to cause the output voltage to reduce, it is ensured that the stability of 1.8V supply voltages.
Current parameters characteristic according to operational amplifier A 1, input bias current is 2.6uA to the maximum, and input offset current is most
Greatly 0.8uA, if the positive input current of operational amplifier A 1 is I1, anti-phase input electric current is I2, due to input bias current
It is 2.6uA, then（I1+ I2）/ 2=2.6 uA, but the input offset current of operational amplifier A 1 is 0.8uA, then I1-I2=
0.8uA.I1=3 uA, I2=2.2 uA are calculated by above-mentioned two formula.
Voltage parameter characteristic according to operational amplifier A 1, input offset voltage is 10mV to the maximum, and common mode input is
1.5V normative references, if the positive input voltage of operational amplifier A 1 is V1, reverse inter-input-ing voltage is V2, due to operational amplifier
The input offset voltage of A1 is 10mV, then the common mode input of V1-V2=10mV, and operational amplifier A 1 is 1.5V, then（V1+
V2）/ 2=1.5V, V1=1.5005V, V2=1.4995 are calculated by above-mentioned two formula.
Again because the input current of the inverting input of operational amplifier A 1 is 2.2 uA, then by second resistance R2 and the 3rd
The electric current of the partial pressure unit 103 that resistance R3 is constituted is 1.8V for the voltage on 2.2 uA, and the partial pressure unit 103, then R2+R3=
1.8V/2.2 uA=818K.Again because the voltage on 3rd resistor R3 is that 1.4995V, electric current are 2.2 uA, then R3=1.4995V/
2.2 uA=681K, then R2=137K.
Again because the input voltage signal of the in-phase input end of operational amplifier A 1 is 1.5005V, then on first resistor R1
Pressure drop be 1.8V-1.5005V=0.2995.The electric current on first resistor R1 is 3 uA again, then R1=0.2995V/3 uA=
99.8K。
Please continue to refer to Fig. 2, the Voltage stabilizing module 10 also includes voltage-regulator diode D1, the negative pole of the voltage-regulator diode D1
The in-phase input end of concatenation operation amplifier A1, the plus earth of voltage-regulator diode D1.Computing is made by voltage-regulator diode D1
The amplitude limit of the in-phase input end of amplifier A1 is 1.5005V.
Further, the Voltage stabilizing module 10 also includes the first filter capacitor C1 and the second filter capacitor C2；Described first
The colelctor electrode of one end connection power management chip, the colelctor electrode of the first triode Q1 and the second triode Q2 of filter capacitor C1,
Also by the in-phase input end of first resistor R1 concatenation operation amplifiers A1, the other end ground connection of the first filter capacitor C1；It is described
One end of second filter capacitor C2 connects emitter stage, the other end of second resistance R2 and the electric current sensing of the second triode Q2 and compares
Compared with control unit 201, the other end of the second filter capacitor C2 is grounded, by the first filter capacitor C1 and the second filter capacitor
C2 filters voltage noise, and the voltage for exporting Voltage stabilizing module is more stable.
Please continue to refer to Fig. 1 and Fig. 2, in the protection circuit of power management chip of the invention, the electric current senses and compares
Include comparator A2, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 compared with control unit 201；Wherein, the 4th resistance
R4 is electric current inductive reactance, and the 5th resistance R5 and the 6th resistance R6 are voltage conversion resistance, for current signal conversion to be existed
Voltage signal.According to the parameter request that current detecting is controlled, the resistance of the 4th resistance R4 is 0.5 ohm, the 5th resistance R5 and the
The resistance of six resistance R6 is respectively 200 ohm.
The first end of the in-phase input end connecting valve control unit 202 of the comparator A2, also pass through the 5th resistance R5
One end of the 4th resistance R4 and the emitter stage of the second triode Q2 are connected, the inverting input connecting valve control of comparator A2 is single
The 3rd of second end of unit 202, the other end for also passing through the 4th resistance R4 of the 6th resistance R6 connections and switch control unit 202
End, the 4th end of the output end connecting valve control unit 202 of the comparator A2, the 5th end of switch control unit 202 connects
Connect each functional module of mobile terminal.
The switch control unit 202 includes the 3rd triode Q3, the 4th triode Q4, the electricity of the 5th triode Q5 and the 7th
Resistance R7；Wherein, the 3rd triode Q3 and the 5th triode Q5 is NPN triode, and the 4th triode Q4 is PNP triode.
The 7th resistance R7 is pull down resistor.
The output end of the comparator A2 connects the base stage of the 3rd triode Q3 and the base stage of the 4th triode Q4, the three or three
The in-phase input end of the colelctor electrode connection comparator A2 of pole pipe Q3, the emitter stage of the second triode connects the collection of the 4th triode Q4
Electrode；The colelctor electrode of four triode is connected the base stage of the 5th triode Q5, is also grounded by the 7th resistance R7, the described 4th
The inverting input of the transmitting collection connection comparator A2 of triode Q4；The colelctor electrode of the 5th triode Q5 connects the 4th resistance
The other end of R4, the emitter stage of the 5th triode Q5 connects each functional module of mobile terminal.
In the present embodiment, due to each functional module and I of mobile phone2The unstability of C signal work causes 1.8V's
Unstable current signal and current impulse, the current signal and current impulse is produced to enter by the power line of 1.8V on power line
Enter power management chip, power management chip can be caused to damage.The present invention is by protection module 20 to the electricity on 1.8V holding wires
Stream signal carries out detection control and processes, it is ensured that the current impulse that unstable power supply signal is produced will not be by holding wire to electricity
Source control chip causes to damage.
When current impulse is produced on holding wire, the electric current at the two ends of the 4th resistance R4 is by the electricity of the 5th resistance R5 and the 6th
Resistance R6 is converted into voltage signal.Because current impulse enters power management chip by holding wire, power management chip is damaged, then
In the output end of the 4th resistance R4（That is one end of the 4th resistance R4）Moment high current can be produced rapidly, in the anti-phase of comparator A2
Pressure drop, the input of the 4th resistance R4 are produced on 6th resistance R6 of input（That is the other end of the 4th resistance R4）Electric current exist
Pressure drop is produced on 5th resistance R5 of the in-phase input end of comparator A2, now the voltage signal of the inverting input of comparator A2
More than the voltage signal of in-phase input end, then comparator A2 outputs low level signal.
In the present embodiment, the 3rd triode Q3 and the four or three quadrupole of two inputs of comparator A2 are connected to, be used for
The level signal of detection comparator A2 outputs, when the low level of comparator A2 outputs, the 4th triode Q4 conductings, the three or three pole
Pipe Q3 ends, then control the 5th triode Q5 of the break-make of erratic current on power line to be also switched off, and blocking current impulse passes through
Power line enters in power management chip, protects power management chip.
When power good is powered, the pressure drop that the electric current of the input of the 4th resistance R4 is produced on the 5th resistance R5 is more than
The pressure drop that the electric current of the output end of the 4th resistance R4 is produced on the 6th resistance R6, then comparator A2 output high level signal.This
When, the 3rd triode Q3 conductings of the in-phase input end of comparator A2 are connected to, it is connected to the inverting input of comparator A2
4th triode Q4 ends, then control the 5th triode Q5 conductings of the break-make of erratic current on power line.Power management core
The voltage signal VDD_1.8V_INPUT of the 1.8V of piece output is input to each functional module and I of mobile phone2C signal line, stabilization
Each functional module and I of ground to mobile phone2C signal is powered.
In sum, the protection circuit of the power management chip that the present invention is provided, core is managed by Voltage stabilizing module stabilized power source
Piece output voltage, and by protection module mobile terminal I2When C signal line produces current impulse, blocking current impulse is led to
Power line input power managing chip is crossed, so as in each functional module and I of mobile terminal2During C signal job insecurity, prevent
Cause the damage to power management chip.
It is understood that for those of ordinary skills, can be with technology according to the present invention scheme and its hair
Bright design is subject to equivalent or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Shield scope.
Claims (6)
1. a kind of protection circuit of power management chip, the power management chip is used for each functional module of mobile terminal
And I2C signal is powered, it is characterised in that including：
For the Voltage stabilizing module of the voltage of stabilized power source managing chip output；
For as the I of mobile terminal2When C signal line produces current impulse, blocking current impulse is managed by power line input power
The protection module of chip；
The input connection power management chip of the Voltage stabilizing module, the output end of Voltage stabilizing module is connected by the protection module
Described each functional module and I2C signal line；
The Voltage stabilizing module includes：Voltage regulation unit, pull-up power supply unit and partial pressure unit, the first input end of the voltage regulation unit
Power management chip, the first of the second input connection partial pressure unit of the voltage regulation unit are connected by pulling up power supply unit
End, the output end of voltage regulation unit connects the second end of partial pressure unit；
The protection module is included for sensing I2C signal line produces the electric current sensing of current pulse signal and compares control unit
With the switch control unit for passing through power line input power managing chip for blocking current impulse；The electric current senses and compares
Control unit connection voltage regulation unit output end, also by switch control unit connection mobile terminal each functional module and
I2C signal line；
The voltage regulation unit includes operational amplifier, the first triode and the second triode, and the pull-up power supply unit includes the
One resistance, the partial pressure unit includes second resistance and 3rd resistor；The in-phase input end of the operational amplifier passes through first
Resistance connects power management chip, one end of the inverting input connection second resistance of operational amplifier and the one of 3rd resistor
End, the output end of the operational amplifier connects the base stage of the first triode；The colelctor electrode of the first triode and the second triode
Colelctor electrode connect the power management chip, the emitter stage of the first triode connects the base stage of the second triode, the two or three pole
The other end and protection module of the emitter stage connection second resistance of pipe, the other end ground connection of 3rd resistor.
2. the protection circuit of power management chip according to claim 1, it is characterised in that the Voltage stabilizing module also includes
Voltage-regulator diode, the in-phase input end of the negative pole concatenation operation amplifier of the voltage-regulator diode, the positive pole of voltage-regulator diode connects
Ground.
3. the protection circuit of power management chip according to claim 1, it is characterised in that the Voltage stabilizing module also includes
First filter capacitor and the second filter capacitor；One end connection power management chip of first filter capacitor, the first triode
Colelctor electrode and the second triode colelctor electrode, also by the in-phase input end of first resistor concatenation operation amplifier, first filter
The other end ground connection of ripple electric capacity；One end of second filter capacitor connect the emitter stage of the second triode, second resistance it is another
One end and electric current sense and compare control unit, the other end ground connection of second filter capacitor.
4. the protection circuit of power management chip according to claim 1, it is characterised in that the electric current sensing and compare
Control unit includes comparator, the 4th resistance, the 5th resistance and the 6th resistance；The in-phase input end connecting valve of the comparator
The emitter stage of the first end of control unit, one end that the 4th resistance is also connected by the 5th resistance and the second triode, comparator
Inverting input connecting valve control unit the second end, also by the 6th resistance connect the 4th resistance the other end and switch
3rd end of control unit, the 4th end of the output end connecting valve control unit of the comparator, the of switch control unit
Five ends connect each functional module of mobile terminal.
5. the protection circuit of power management chip according to claim 4, it is characterised in that the switch control unit bag
Include the 3rd triode, the 4th triode, the 5th triode and the 7th resistance；The output end of the comparator connects the 3rd triode
Base stage and the 4th triode base stage, the colelctor electrode of the 3rd triode connects the in-phase input end of comparator, the 3rd triode
Emitter stage connect the 4th triode colelctor electrode；The colelctor electrode of four triode connects the base stage of the 5th triode, also leads to
Cross the 7th resistance eutral grounding, the inverting input of the transmitting collection connection comparator of the 4th triode；5th triode
Colelctor electrode connects the other end of the 4th resistance, and the emitter stage of the 5th triode connects each functional module of mobile terminal.
6. the protection circuit of power management chip according to claim 5, it is characterised in that the first triode, the two or three
Pole pipe, the 3rd triode and the 5th triode are NPN triode, and the 4th triode is PNP triode.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1029158A1 (en) * | 1982-01-04 | 1983-07-15 | Предприятие П/Я А-1178 | High=voltage dc voltage stabilizer |
| CN101763332A (en) * | 2010-02-24 | 2010-06-30 | 浙江中控技术股份有限公司 | Parallel communication bus interface |
| CN202094711U (en) * | 2010-12-31 | 2011-12-28 | 保定天威集团有限公司 | Direct current supply device capable of obtaining electric energy from cable in service |
| CN102347603A (en) * | 2011-09-21 | 2012-02-08 | 深圳市英威腾电气股份有限公司 | Drive and protection circuit for IGBT (Insulated Gate Bipolar Transistor) |
| CN102938797A (en) * | 2012-11-05 | 2013-02-20 | Tcl通讯（宁波）有限公司 | Current detection and control device for mobile terminal |
-
2014
- 2014-07-21 CN CN201410346866.8A patent/CN104092181B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1029158A1 (en) * | 1982-01-04 | 1983-07-15 | Предприятие П/Я А-1178 | High=voltage dc voltage stabilizer |
| CN101763332A (en) * | 2010-02-24 | 2010-06-30 | 浙江中控技术股份有限公司 | Parallel communication bus interface |
| CN202094711U (en) * | 2010-12-31 | 2011-12-28 | 保定天威集团有限公司 | Direct current supply device capable of obtaining electric energy from cable in service |
| CN102347603A (en) * | 2011-09-21 | 2012-02-08 | 深圳市英威腾电气股份有限公司 | Drive and protection circuit for IGBT (Insulated Gate Bipolar Transistor) |
| CN102938797A (en) * | 2012-11-05 | 2013-02-20 | Tcl通讯（宁波）有限公司 | Current detection and control device for mobile terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104092181A (en) | 2014-10-08 |
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