CN109638798A - The protection circuit and switched charge circuit of switched charge chip - Google Patents
The protection circuit and switched charge circuit of switched charge chip Download PDFInfo
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- CN109638798A CN109638798A CN201811593002.0A CN201811593002A CN109638798A CN 109638798 A CN109638798 A CN 109638798A CN 201811593002 A CN201811593002 A CN 201811593002A CN 109638798 A CN109638798 A CN 109638798A
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- 238000001514 detection method Methods 0.000 claims abstract description 54
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 230000005611 electricity Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 15
- 230000005669 field effect Effects 0.000 description 9
- 238000013461 design Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 3
- 101100194362 Schizosaccharomyces pombe (strain 972 / ATCC 24843) res1 gene Proteins 0.000 description 2
- 101100194363 Schizosaccharomyces pombe (strain 972 / ATCC 24843) res2 gene Proteins 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H02J7/0026—
Abstract
The invention discloses a kind of protection circuit of switched charge chip and switched charge circuits, by trigger unit, for being connected under the action of the first trigger voltage, and in the on-state, generate according to input voltage and export the second trigger voltage.Detection unit, for being connected under the action of the first trigger voltage, and in the on-state, voltage and second trigger voltage of the voltage more to be detected Jing Guo pressure drop；If voltage of the voltage to be detected Jing Guo pressure drop is greater than the second trigger voltage, the grid voltage for then exporting the first switch tube in control Signal-controlled switch charging chip is pulled down to less than the second trigger voltage, and first switch tube is for the input terminal of control switch charging chip and the on-off of output port.When excessively high by the gate source voltage of circuit realization first switch tube disclosed above, the grid voltage for controlling first switch tube is pulled down to less than the second trigger voltage, protective switch charging chip, it is ensured that switched charge chip works normally.
Description
Technical field
The present invention relates to the protection circuit and switched charge of integrated circuit fields more particularly to a kind of switched charge chip electricity
Road.
Background technique
With the diversified development of portable electronic product, the requirement to switch charging chip is also higher and higher.Current
Switched charge chip also supports the high-voltage charging of 9V and 12V in addition to supporting basic 5V normal pressure charging.
Switched charge chip is during the charging process, it may occur that abnormal situation, for this reason, it may be necessary to switch charging chip
The corresponding protection circuit of design.The protection circuit of the switched charge chip of the prior art is in design, it is contemplated that switched charge core
The problems such as positive and negative overshoot of piece input terminal, the temperature of switched charge chip is excessively high and output short-circuit.But existing switched charge
The protection circuit of chip does not account for the case where input terminal is short-circuited to ground suddenly in design.
In the charging process of switched charge chip, when input terminal is short-circuited to ground suddenly, in switched charge chip
The gate source voltage of first switch tube is excessively high, and grid oxygen is caused to puncture, and causes the damage of first switch tube, switched charge chip cannot be just
Often work.
Summary of the invention
Based on above-mentioned the deficiencies in the prior art, the invention proposes a kind of circuits of protective switch charging chip and switch to fill
Circuit, when the gate source voltage to realize first switch tube is excessively high, the grid voltage for controlling first switch tube is pulled down to less than
Two trigger voltages, protective switch charging chip, it is ensured that switched charge chip works normally.
To achieve the goals above, it is proposed that scheme it is as follows:
First aspect present invention discloses a kind of protection circuit of switched charge chip, comprising:
Trigger unit and the detection unit being connected with the trigger unit；
The trigger unit, for receiving the first trigger voltage and input voltage respectively, the trigger unit is described
It is connected under the action of one trigger voltage, and in the on-state, is generated according to the input voltage and exports the second trigger voltage；
The detection unit, for receiving first trigger voltage, voltage to be detected and the second triggering electricity respectively
Pressure, the detection unit are connected under the action of the first trigger voltage, and in the on-state, the voltage warp to be detected
Cross pressure drop voltage and second trigger voltage；If voltage of the voltage to be detected Jing Guo pressure drop is greater than second triggering
Voltage, then export control signal control the first switch tube in the switched charge chip grid voltage pull down to be less than it is described
Second trigger voltage, the first switch tube are used to control the input terminal of the switched charge chip and the on-off of output port.
Optionally, the trigger unit, comprising:
First protective resistance, first switch and the second switch；
Wherein, one end of first protective resistance receives the input voltage, and the other end connects the second switch
First end, the second end of the second switch connect the second end of the first switch, the control terminal connection of the second switch
The detection unit, the first end ground connection of the first switch, the control terminal of the first switch receive the first triggering electricity
Pressure；
Wherein, the common end of the second switch and the detection unit, with the second switch and the first switch
Common end be connected.
Optionally, the detection unit, comprising:
Second protective resistance, detection resistance, third switch and the 4th switch；
Wherein, one end of second protective resistance receives the voltage to be detected, and the other end connects the detection resistance,
The other end of the detection resistance connects the first end of the 4th switch, and the second end of the 4th switch connects the third
The control terminal of the second end of switch, the 4th switch connects the trigger unit and receives second trigger voltage, described
The control terminal of the first end ground connection of third switch, the third switch receives first trigger voltage；
Wherein, the common end of the third switch ground connection, for exporting the control signal.
Optionally, the protection circuit of the switched charge chip further include:
The rp unit being connected with the detection unit for receiving the control signal, and exports the control signal
By the processing result of the rp unit.
Optionally, the rp unit, comprising:
First phase inverter and the second phase inverter；
One end of first phase inverter connects the detection unit, and the other end connects one end of second phase inverter,
The other end of second phase inverter exports the control signal.
Optionally, the protection circuit of the switched charge chip further include:
The control door being connected with second phase inverter；
The control door receives enable signal and the control signal respectively, if the enable signal and the control signal
Meet pre-provisioning request, then the grid voltage that the control door controls the first switch tube is pulled down to less than the second triggering electricity
Pressure；
The pre-provisioning request is for reflecting that voltage of the voltage to be detected Jing Guo pressure drop is greater than the second triggering electricity
Pressure.
Optionally, the protection circuit of the switched charge chip further include:
The control door being connected with the detection unit；
The control door receives enable signal and the control signal respectively, if the enable signal and the control signal
Meet pre-provisioning request, then the grid voltage that the control door controls the first switch tube is pulled down to less than the second triggering electricity
Pressure；
The pre-provisioning request is for reflecting that voltage of the voltage to be detected Jing Guo pressure drop is greater than the second triggering electricity
Pressure.
Second aspect of the present invention discloses a kind of switched charge circuit, comprising:
The protection circuit of any one switched charge chip disclosed in switched charge chip and first aspect present invention；
Wherein, the switched charge chip is connected with the protection circuit of the switched charge chip.
Optionally, the driving unit in the switched charge chip, is connected with the protection circuit of the switched charge chip,
Institute is controlled for receiving the control signal of the protection circuit output of the switched charge chip, and according to the control signal
The grid voltage for stating first switch tube is pulled down to less than second trigger voltage.
Optionally, the driving unit includes:
Third protective resistance, zener diode, charge pump and second switch；
The first end of the second switch is grounded, and the second end of the second switch connects the first switch tube
Control terminal, the control terminal of the second switch connect the protection circuit of the switched charge chip；
One end of the third protective resistance receives first trigger voltage, and the other end is connect by the zener diode
Ground；
The first input end of the charge pump connects the common end of the third protective resistance and the zener diode, the
Two input terminals receive first trigger voltage, and output end connects the second end of the second switch.
It can be seen from the above technical scheme that the protection circuit and switched charge of switched charge chip provided by the invention
Circuit, by trigger unit and the detection unit being connected with trigger unit, voltage and of the voltage more to be detected Jing Guo pressure drop
Two trigger voltages, when voltage of the voltage to be detected Jing Guo pressure drop is greater than the second trigger voltage, output control Signal-controlled switch
The grid voltage of first switch tube in charging chip is pulled down to less than the second trigger voltage, and first switch tube is used for control switch
The input terminal of charging chip and the on-off of output port, it is possible thereby to when realizing that the gate source voltage of first switch tube is excessively high, control
The grid voltage of first switch tube is pulled down to less than the second trigger voltage, protective switch charging chip, it is ensured that switched charge chip
It works normally.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structure chart of switched charge chip；
Fig. 2 is a kind of protection circuit of switched charge chip disclosed by the embodiments of the present invention；
Fig. 3 is the protection circuit of another switched charge chip disclosed by the embodiments of the present invention；
Fig. 4 is the protection circuit of another switched charge chip disclosed by the embodiments of the present invention；
Fig. 5 is the protection circuit of another switched charge chip disclosed by the embodiments of the present invention；
Fig. 6 is the protection circuit of another switched charge chip disclosed by the embodiments of the present invention；
Fig. 7 is the protection circuit of another switched charge chip disclosed by the embodiments of the present invention；
Fig. 8 is a kind of switched charge circuit disclosed by the embodiments of the present invention；
Fig. 9 is another switched charge circuit disclosed by the embodiments of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the port VBUS connection input terminal in switched charge chip, i.e. connection USB port.In charging process
In, due to port VBUS connection USB port, so port VBUS is possible to by suddenly-applied short circuit to ground.If port VBUS is unexpected
It is shorted to ground, then the gate source voltage of first switch tube Q1 is a very high voltage.Under normal circumstances, the grid of metal-oxide-semiconductor field effect transistor
Source overtension will cause the grid oxygen breakdown of metal-oxide-semiconductor field effect transistor, damage metal-oxide-semiconductor field effect transistor.Therefore, first switch tube Q1 is this
In the case of be easy to damage.
In view of the above-mentioned problems, needing to the corresponding protection circuit of switch charging chip design, the invention proposes one kind to open
The protection circuit and switched charge circuit for closing charging chip, when the gate source voltage to realize first switch tube is excessively high, control first
The grid voltage of switching tube is pulled down to less than the second trigger voltage, protective switch charging chip, it is ensured that switched charge chip is normal
Work.
Referring to Fig.2, the embodiment of the invention discloses a kind of protection circuits of switched charge chip, comprising:
Trigger unit 201 and the detection unit 202 being connected with trigger unit 201.
Trigger unit 201, for receiving the first trigger voltage and input voltage respectively, trigger unit 201 is in the first triggering
It is connected under the action of voltage, and in the on-state, generates according to input voltage and export the second trigger voltage.
Detection unit 202, for receiving the first trigger voltage, voltage to be detected and the second trigger voltage respectively, detection is single
Member 202 is connected under the action of the first trigger voltage, and in the on-state, voltage of the voltage more to be detected Jing Guo pressure drop and
Second trigger voltage.Pressure drop refers to that voltage of the electric current after overload is varied relative to without the voltage before overload,
In the embodiment of the present invention, the resistance value of load can be set as to consume the resistance value of the first trigger voltage.If voltage warp to be detected
The voltage for crossing pressure drop is greater than the second trigger voltage, then exports the grid of the first switch tube in control Signal-controlled switch charging chip
Pole tension is pulled down to less than the second trigger voltage, and first switch tube is used for the input terminal and output port of control switch charging chip
On-off.
In general, first switch tube can be NMOS field-effect tube.It should be noted that voltage to be detected is opened for first
The grid voltage of pipe is closed, input voltage is the voltage of input terminal, and the voltage of input terminal is also possible to the first trigger voltage.
The protection circuit of switched charge chip provided in an embodiment of the present invention, passes through trigger unit 201 and and trigger unit
201 connected detection units 202, voltage and second trigger voltage of the voltage more to be detected Jing Guo pressure drop, when voltage to be detected
When voltage by pressure drop is greater than the second trigger voltage, output controls the first switch tube in Signal-controlled switch charging chip
Grid voltage is pulled down to less than the second trigger voltage, and first switch tube is used for the input terminal and output end of control switch charging chip
The on-off of mouth, it is possible thereby to control the grid voltage drop-down of first switch tube when realizing that the gate source voltage of first switch tube is excessively high
To less than the second trigger voltage, protective switch charging chip, it is ensured that switched charge chip works normally.
Optionally, refering to Fig. 3, in another embodiment of the invention, a kind of embodiment of trigger unit 301, comprising:
First protective resistance RES1, first switch S1 and second switch S2.
Wherein: one end of the first protective resistance RES1 receives input voltage, and the other end connects the first end of second switch S2,
The second end of the second end connection first switch S1 of second switch S2, the control terminal connecting detection unit 302 of second switch S2, the
The first end of one switch S1 is grounded, and the control terminal of first switch S1 receives the first trigger voltage.Wherein, second switch S2 and detection
The common end of unit 302 is connected with the common end of second switch S2 and first switch S1.
It should be noted that first switch S1 can be NMOS field-effect tube, second switch S2 can be PMOS field-effect
Pipe.The first end of first switch S1 is as source electrode, and the second end of first switch S1 as drain electrode, make by the control terminal of first switch S1
For grid.Similarly, the first end of second switch S2 is as source electrode, and the second end of second switch S2 is as drain electrode, second switch S2
Control terminal as grid.
When the grid of first switch S1 receives the first trigger voltage, and the source voltage of first switch S1 is ground voltage, the
The grid voltage of one switch S1 is greater than source voltage, first switch S1 conducting.After first switch S1 conducting, 301 shape of trigger unit
At access, the second trigger voltage is generated at the common end of second switch S2 and detection unit 302, and defeated to detection unit 302
Second trigger voltage out.Meanwhile the source electrode of second switch S2 receives input voltage, the grid of second switch S2 receives the second triggering
Voltage, the second trigger voltage are ground voltage, and the source voltage of second switch S2 is greater than grid voltage, second switch S2 conducting.
Optionally, refering to Fig. 3, in another embodiment of the present invention, a kind of embodiment of detection unit 302, comprising:
Second protective resistance RES2, detection resistance R, third switch S3 and the 4th switch S4.
Wherein: one end of the second protective resistance RES2 receives voltage to be detected, other end connecting detection resistance R, detection electricity
The other end for hindering R connects the first end of the 4th switch S4, and the second end of the 4th switch S4 connects the second end of third switch S3, the
The control terminal connection trigger unit 301 of four switch S4 simultaneously receives the second trigger voltage, the first end ground connection of third switch S3, third
The control terminal of switch S3 receives the first trigger voltage.Wherein, the common end of third switch S3 ground connection, for exporting control signal.
It should be noted that third switch S3 can be NMOS field-effect tube, the 4th switch S4 can be PMOS field-effect
Pipe.The first end of third switch S3 is as source electrode, and the second end of third switch S3 as drain electrode, make by the control terminal of third switch S3
For grid.Similarly, the first end of the 4th switch S4 is as source electrode, and the second end of the 4th switch S4 is as drain electrode, the 4th switch S4
Control terminal as grid.Detection resistance R can select suitable resistance according to demand.
The grid of third switch S3 receives the first trigger voltage, when the source voltage of third switch S3 is ground voltage, third
The grid voltage of switch S3 is greater than source voltage, third switch S3 conducting.Meanwhile the 4th switch S4 grid receive second triggering
Voltage, the source electrode of the 4th switch S4 receive voltage of the voltage to be detected Jing Guo pressure drop.It should be noted that voltage to be detected passes through
Detection resistance R consumes corresponding voltage, that is to say, that the voltage of voltage to be detected resistance R after testing is that voltage to be detected passes through
Cross the voltage of pressure drop.If the source voltage of the 4th switch S4 is greater than grid voltage, the 4th switch S4 conducting, detection unit 302
Form access, the grid of the first switch tube in the common end output control Signal-controlled switch charging chip of third switch S3 ground connection
Pole tension is pulled down to less than the second trigger voltage.
Refering to Fig. 4, the embodiment of the invention discloses the protection circuits of another switched charge chip, comprising:
Trigger unit 401, detection unit 402 and the rp unit 403 being connected with detection unit 402.
Wherein, the trigger unit 301 in the implementation procedure and principle of trigger unit 401 and detection unit 402 and Fig. 3 and
Detection unit 302 is identical, and which is not described herein again.
Rp unit 403 for receiving control signal, and exports the processing result that control signal passes through rp unit.
It should be noted that control signal is identical as untreated control signal by the processing result of rp unit.
Optionally, refering to Fig. 5, a kind of embodiment of rp unit 503, comprising:
First phase inverter and the second phase inverter.
One end connecting detection unit 502 of first phase inverter, the other end connect one end of the second phase inverter, the second phase inverter
The other end output control signal.
It should be noted that detection unit 502 exports control signal to the first phase inverter, control signal passes through the first reverse phase
Device, using the second phase inverter being connected with the first phase inverter, the second phase inverter output control signal.
Refering to Fig. 6, the embodiment of the invention discloses the protection circuits of another switched charge chip, comprising:
Trigger unit 601, detection unit 602, the first phase inverter, the second phase inverter and the control being connected with the second phase inverter
Door.
Wherein, the trigger unit 301 in the implementation procedure and principle of trigger unit 601 and detection unit 602 and Fig. 3 and
Detection unit 302 is identical, and which is not described herein again.In the implementation procedure and principle and Fig. 5 of first phase inverter and the second phase inverter
The first phase inverter and the second phase inverter it is identical, which is not described herein again.
Control door receives enable signal and control signal respectively, if enable signal and control signal meet pre-provisioning request,
The grid voltage of control door control first switch tube is pulled down to less than the second trigger voltage.Pre-provisioning request is to be detected for reflecting
Voltage of the voltage Jing Guo pressure drop is greater than the second trigger voltage.
Refering to Fig. 7, the embodiment of the invention discloses the protection circuits of another switched charge chip, comprising:
Trigger unit 701, detection unit 702 and the control door being connected with detection unit 702.
Wherein, the trigger unit 301 in the implementation procedure and principle of trigger unit 701 and detection unit 702 and Fig. 3 and
Detection unit 302 is identical, and which is not described herein again.
Control door receives enable signal and control signal respectively, if enable signal and control signal meet pre-provisioning request,
The grid voltage of control door control first switch tube is pulled down to less than the second trigger voltage.Pre-provisioning request is to be detected for reflecting
Voltage of the voltage Jing Guo pressure drop is greater than the second trigger voltage.
Refering to Fig. 8, the embodiment of the invention discloses a kind of switched charge circuits, comprising:
The protection circuit 802 of switched charge chip 801 and switched charge chip.Switched charge chip 801 and switched charge
The protection circuit 802 of chip is connected.
Wherein, shown in the specific implementation process of the protection circuit of switched charge chip and realization principle and above-described embodiment
The protection circuit of switched charge chip is consistent, reference can be made to, which is not described herein again.
It should be noted that the driving unit in switched charge chip 801, the protection circuit 802 with switched charge chip
It is connected, the control signal that the protection circuit 802 for receiving switched charge chip exports, and opened according to control signal control first
The grid voltage for closing pipe is pulled down to less than the second trigger voltage.
Optionally, refering to Fig. 9, a kind of embodiment of driving unit 901, comprising:
Third protective resistance R3, zener diode, charge pump and second switch Q2.
Optionally, a kind of connection type are as follows: the first end of second switch Q2 is grounded, and the second end of second switch Q2 connects
Connect the control terminal of first switch tube Q1, the protection circuit 902 of the control terminal connection switch charging chip of second switch Q2.
One end of third protective resistance R3 receives the first trigger voltage, and the other end is grounded by zener diode.
The common end of first input end connection the third protective resistance R3 and zener diode of charge pump, the second input termination
The first trigger voltage is received, output end connects the second end of second switch Q2.
It should be noted that second switch Q2 can be NMOS field-effect tube, the first end of second switch Q2 is source
Pole, second end are drain electrode, and control terminal is grid.The first end of first switch tube is source electrode, and second end is drain electrode, and control terminal is grid
Pole.
It should be noted charge pump output voltage, grid voltage of the voltage as first switch tube Q1, first opens
The source voltage for closing pipe Q1 is the voltage of input terminal.Because grid voltage is greater than source voltage when first switch tube Q1 is connected,
The voltage of charge pump output is greater than the voltage of input terminal, so the voltage of charge pump output is a bigger voltage.
When input terminal is short-circuited to ground suddenly, the gate source voltage of first switch tube Q1 is the voltage of charge pump output.If
The gate source voltage of first switch tube Q1 is excessive, then first switch tube Q1 is caused to damage.At this point, the protection circuit of switched charge chip
The control signal instruction of 902 outputs needs the grid voltage by first switch tube Q1 to pull down to less than the second trigger voltage.Second
The control terminal of switching tube Q2 receives control signal, and second switch Q2 is connected, under the grid voltage for controlling first switch tube Q1
It draws less than the second trigger voltage.At this point, the gate source voltage of first switch tube does not have excessive, the damage of first switch tube not will cause
It is bad.
Professional technician can be realized or using the present invention.Profession of the various modifications to these embodiments to this field
It will be apparent for technical staff, the general principles defined herein can not depart from spirit or model of the invention
In the case where enclosing, realize in other embodiments.Therefore, the present invention will not be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with the principles and novel features disclosed herein.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Claims (10)
1. a kind of protection circuit of switched charge chip characterized by comprising
Trigger unit and the detection unit being connected with the trigger unit；
The trigger unit, for receiving the first trigger voltage and input voltage respectively, the trigger unit is in first touching
It is connected under the action of power generation pressure, and in the on-state, is generated according to the input voltage and export the second trigger voltage；
The detection unit, for receiving first trigger voltage, voltage to be detected and second trigger voltage, institute respectively
It states detection unit to be connected under the action of the first trigger voltage, and in the on-state, the voltage to be detected is through over-voltage
The voltage of drop and second trigger voltage；If voltage of the voltage to be detected Jing Guo pressure drop is greater than the second triggering electricity
Pressure, then export control signal and control the grid voltage of the first switch tube in the switched charge chip and pull down to less than described the
Two trigger voltages, the first switch tube are used to control the input terminal of the switched charge chip and the on-off of output port.
2. circuit according to claim 1, which is characterized in that the trigger unit, comprising:
First protective resistance, first switch and the second switch；
Wherein, one end of first protective resistance receives the input voltage, and the other end connects the first of the second switch
End, the second end of the second switch connect the second end of the first switch, described in the control terminal connection of the second switch
Detection unit, the first end ground connection of the first switch, the control terminal of the first switch receive first trigger voltage；
Wherein, the common end of the second switch and the detection unit, the public affairs with the second switch and the first switch
End is connected altogether.
3. circuit according to claim 1, which is characterized in that the detection unit, comprising:
Second protective resistance, detection resistance, third switch and the 4th switch；
Wherein, one end of second protective resistance receives the voltage to be detected, and the other end connects the detection resistance, described
The other end of detection resistance connects the first end of the 4th switch, and the second end of the 4th switch connects the third switch
Second end, the control terminal of the 4th switch connects the trigger unit and simultaneously receives second trigger voltage, the third
The first end of switch is grounded, and the control terminal of the third switch receives first trigger voltage；
Wherein, the common end of the third switch ground connection, for exporting the control signal.
4. circuit according to claim 1, which is characterized in that further include:
The rp unit being connected with the detection unit for receiving the control signal, and exports the control signal and passes through
The processing result of the rp unit.
5. circuit according to claim 4, which is characterized in that the rp unit, comprising:
First phase inverter and the second phase inverter；
One end of first phase inverter connects the detection unit, and the other end connects one end of second phase inverter, described
The other end of second phase inverter exports the control signal.
6. circuit according to claim 5, which is characterized in that further include:
The control door being connected with second phase inverter；
The control door receives enable signal and the control signal respectively, if the enable signal and the control signal meet
Pre-provisioning request, the then grid voltage that the control door controls the first switch tube are pulled down to less than second trigger voltage；
The pre-provisioning request is for reflecting that voltage of the voltage to be detected Jing Guo pressure drop is greater than second trigger voltage.
7. circuit according to claim 1, which is characterized in that further include:
The control door being connected with the detection unit；
The control door receives enable signal and the control signal respectively, if the enable signal and the control signal meet
Pre-provisioning request, the then grid voltage that the control door controls the first switch tube are pulled down to less than second trigger voltage；
The pre-provisioning request is for reflecting that voltage of the voltage to be detected Jing Guo pressure drop is greater than second trigger voltage.
8. a kind of switched charge circuit characterized by comprising
The protection circuit of switched charge chip and the switched charge chip as described in any one of power 1 to 6；Wherein, described
Switched charge chip is connected with the protection circuit of the switched charge chip.
9. circuit according to claim 8, which is characterized in that the driving unit in the switched charge chip, and it is described
The protection circuit of switched charge chip is connected, the control letter of the protection circuit output for receiving the switched charge chip
Number, and pull down to according to the grid voltage that the control signal controls the first switch tube less than second trigger voltage.
10. circuit according to claim 9, which is characterized in that the driving unit includes:
Third protective resistance, zener diode, charge pump and second switch；
The first end of the second switch is grounded, and the second end of the second switch connects the control of the first switch tube
End, the control terminal of the second switch connect the protection circuit of the switched charge chip；
One end of the third protective resistance receives first trigger voltage, and the other end is grounded by the zener diode；
The first input end of the charge pump connects the common end of the third protective resistance and the zener diode, and second is defeated
Enter end and receive first trigger voltage, output end connects the second end of the second switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811593002.0A CN109638798B (en) | 2018-12-20 | 2018-12-20 | Protection circuit of switch charging chip and switch charging circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654085A (en) * | 2020-06-17 | 2020-09-11 | 上海艾为电子技术股份有限公司 | Charging circuit and electronic equipment |
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| CN109638798B (en) | 2024-02-09 |
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