CN110417087A - A kind of charging chip - Google Patents
A kind of charging chip Download PDFInfo
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- CN110417087A CN110417087A CN201910697059.3A CN201910697059A CN110417087A CN 110417087 A CN110417087 A CN 110417087A CN 201910697059 A CN201910697059 A CN 201910697059A CN 110417087 A CN110417087 A CN 110417087A
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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Abstract
The invention discloses a kind of charging chips; it include: port protection circuit, clock circuit, in-line power circuit, charge pump circuit, relatively conversion circuit, charging control circuit, first switch tube, second switch and third switching tube; relatively conversion circuit input terminal connects USB port; output end connects charge pump circuit; relatively conversion circuit is used to detect the input voltage of USB port; when input voltage is more than default pressure voltage; increase the phase-to-ground voltage of output to charge pump circuit, and the difference of phase-to-ground voltage and input voltage is not higher than preset pressure.After the present invention in charging chip by increasing relatively conversion circuit, charge pump circuit in charging chip is using USB port as anode power input, using the phase-to-ground voltage of the output of relatively conversion circuit as negative terminal power input, to which charge pump circuit can realize the high pressure resistant function of port using low-voltage device, to reduce area occupied of the charge pump circuit in charging chip.
Description
Technical field
The present invention relates to technical field of integrated circuits, more specifically, being related to a kind of charging chip.
Background technique
USB (universal serial bus, Universal of the input terminal of charging chip as portable electronic devices such as mobile phones
Serial Bus) port, typically directly it is connect with adapter, and the output end of adapter is often by because of grid disturbance, thunder
It hits, the influence for the high-voltage pulse that the factors such as plug of artificial moment generate, this high-voltage pulse transient energy is very big, and crest voltage is logical
30V or more can often be reached, therefore, charging chip internal components is easy to cause to generate irreversible damage.In addition, charging chip
The negative sense surge voltage of input terminal, also results in the damage of charging chip internal power transmitting stage and in-line power circuit.
As shown in Figure 1, to integrate the circuit diagram of the charging chip of overvoltage protection, at present the charging core of mainstream in the prior art
USB port and the system confession as charging chip input terminal is usually isolated in piece by first switch tube Q1 and second switch Q2
Electric port SYS.First switch tube Q1 is mainly used to that the negative pressure of USB port is isolated, meanwhile, the source and drain terminal of first switch tube Q1
It can be used to sample charging chip internal current, second switch Q2 can isolate the positive high pressure of USB port.Charge pump circuit
For the driving circuit of first switch tube Q1 and second switch Q2, main function is to generate a higher voltage, with driving
The grid end of first switch tube Q1 and second switch Q2.Port protection circuit is used to detect USB port, when USB port generated
When pressure, then charge pump circuit is turned off rapidly.Diode D_ESD is the ESD (Electro-Static at the end chip USB
Discharge, electrostatic impedor) device, it is mainly used to do the ESD protection of USB port.Third switching tube Q3 is power tube line of reasoning
Diameter adjustment pipe, charging control circuit are the driving circuit of third switching tube Q3, and when charging chip is in charge mode, third is switched
Pipe Q3 is opened, and the input voltage of USB port is transmitted to output end BAT and charged the battery by charging chip.In-line power circuit is given
The operating voltage VDD of safety is provided inside charging chip.
From figure 1 it appears that charge pump circuit played in charging chip and port protection circuit it is very important
Effect, the working principle of charge pump circuit are as follows: using the clock pulse signal of the output of clock circuit as input signal, periodically
Charge and discharge, and the principle that cannot be mutated using capacitor both end voltage are carried out to the internal capacitance of charge pump circuit, by input terminal
That is the input voltage V at the end USBUSBThe grid end for amplifying rear output driving first switch tube Q1 and second switch Q2 (controls
End).
But this traditional charge pump bias scheme has apparent defect, is obtained by aforementioned, the end USB of charge pump circuit
Mouth is high pressure port, and the voltage of the output end CP of charge pump circuit is usually the sum of USB port and the voltage of vdd terminal mouth, i.e. VCP
=VUSB+VVDD.Therefore, the devices such as NMOS tube, PMOS tube and the capacitor used inside charge pump circuit are required using pressure resistance
Higher high tension apparatus, and therefore chip area consumed by high tension apparatus causes charge pump circuit to exist much larger than low-voltage device
The area occupied in charging chip is larger.
Summary of the invention
In view of this, the present invention discloses a kind of charging chip, relatively converted with realizing by increasing in charging chip
After circuit, the charge pump circuit in charging chip is using USB port as anode power input, with the output of relatively conversion circuit
Phase-to-ground voltage as negative terminal power input, so that charge pump circuit can realize the high pressure resistant function of port using low-voltage device
Can, therefore it is greatly reduced area occupied of the charge pump circuit in charging chip.
A kind of charging chip, comprising: port protection circuit, clock circuit, in-line power circuit, charge pump circuit, opposite
Ground conversion circuit, charging control circuit, first switch tube, second switch and third switching tube；
The USB port of the input terminal connection charging chip of the port protection circuit, the output of the port protection circuit
End connects the charge pump circuit, and the port protection circuit is used to detect the input voltage of the USB port, and works as and detect
When the input voltage is overvoltage, the charge pump circuit is turned off；
The output end of the clock circuit connects the charge pump circuit, and the clock circuit is used for the charge pump electricity
Road output clock pulse signal；
The in-line power circuit is electric with the clock circuit, the relatively conversion circuit and the charge control respectively
Road connection, for providing safe power supply for the clock circuit, the relatively conversion circuit and the charging control circuit
Voltage；
The output end of the charging control circuit connects the control terminal of the third switching tube, the third switching tube it is defeated
Enter end connection system power supply port, the output end of the third switching tube connects battery, and the charging control circuit is used in institute
When stating charging chip and being in charge mode, controls the third switching tube and open, by the electricity of the input and output of the USB port
Pressure is transmitted to the output end of the charging chip as battery charging；
The output end of the charge pump circuit respectively with the control terminal of the first switch tube and the second switch
Control terminal connection, the input terminal of the first switch tube connect the USB port, the output end of the first switch tube and described
The output end of second switch connects, and the control terminal of the second switch connects the system power supply port, the charge pump
The clock pulse signal that circuit is used to export using the clock circuit periodically carries out charge and discharge to internal capacitance as input signal
Electricity, and the input voltage of the USB port is amplified, and the control of the first switch tube is driven using amplified voltage
The control terminal at end processed and the second switch；
The input terminal of the relatively conversion circuit connects the USB port, the output end of the relatively conversion circuit
The charge pump circuit is connected, the relatively conversion circuit is used to detect the input voltage of the USB port, when the input
When voltage is more than default pressure voltage, increase the phase-to-ground voltage of output to the charge pump circuit, and the phase-to-ground voltage and
The difference of the input voltage is not higher than preset pressure.
Optionally, the first switch tube and the second switch are NMOS tube.
Optionally, the relatively conversion circuit includes: fixed bias current source, Zener diode, resistance, the 4th switch
Pipe, the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switching tube, the 9th switching tube, the tenth switching tube；
The input terminal in the fixed bias current source is provided for connecting the in-line power circuit by in-line power circuit
The output end of the supply voltage of safety, the fixed bias current source connects the 4th switching tube, the 4th switching tube
Control terminal connects the input terminal of the 4th switching tube, the output end ground connection of the 4th switching tube；
The common end of the cathode of the Zener diode and the resistance with the USB port for connecting, the Zener
The anode of diode connects the input terminal of the 8th switching tube, the control of the 8th switching tube with the common end of the resistance
End connects the input terminal in the fixed bias current source, and the output end of the 8th switching tube connects the defeated of the 5th switching tube
Enter end, the control terminal of the 5th switching tube connects the control terminal of the 4th switching tube, the output end of the 5th switching tube
Ground connection；
The input terminal of tenth switching tube is for connecting the USB port, the control terminal connection of the tenth switching tube
The common end of the anode of the Zener diode and the resistance, the output end connection of the tenth switching tube the 9th switch
The input terminal of pipe, the control terminal of the 9th switching tube connect the input terminal of the 8th switching tube, nine switching tube it is defeated
Outlet connects the input terminal of the 6th switching tube, and the control terminal of the 6th switching tube connects the input of the 6th switching tube
End, the output end ground connection of the 6th switching tube；
The control terminal of 7th switching tube connects the control terminal of the 6th switching tube, the output of the 7th switching tube
End ground connection；
Input terminal, the input terminal of the 9th switching tube and the output end of the tenth switching tube of 7th switching tube
Output end of the common end as the relatively conversion circuit, for connecting the charge pump circuit.
Optionally, the 4th switching tube, the 5th switching tube and the 6th switching tube are low pressure NMOS device.
Optionally, the 7th switching tube, the 8th switching tube and the tenth switching tube are high pressure resistant NMOS device；
9th switching tube is high pressure resistant PMOS device.
Optionally, the relatively conversion circuit further include: the 11st switching tube；
The input terminal of 11st switching tube is for connecting the USB port, the control terminal of the 11st switching tube
The control terminal of the tenth switching tube is connected, the output end of the 11st switching tube connects the input terminal of the tenth switching tube, institute
The 11st switching tube is stated for preventing the tenth switching tube because drain-source voltage is excessively high and breakdown.
Optionally, the 11st switching tube is high pressure resistant PMOS device.
From above-mentioned technical solution it is found that the invention discloses a kind of charging chips, comprising: port protection circuit, clock
Circuit, in-line power circuit, charge pump circuit, relatively conversion circuit, charging control circuit, first switch tube, second switch
Pipe and third switching tube, the USB port of relatively conversion circuit input terminal connection charging chip, the relatively output of conversion circuit
End connection charge pump circuit, relatively conversion circuit is used to detect the input voltage of USB port, when input voltage is resistance to more than presetting
When pressure value, increase the phase-to-ground voltage of output to charge pump circuit, and the difference of phase-to-ground voltage and input voltage is not higher than pre-
If pressure difference.After the present invention in charging chip by increasing relatively conversion circuit, the charge pump circuit in charging chip is with USB
Port is as anode power input, using the phase-to-ground voltage of the output of relatively conversion circuit as negative terminal power input, thus
Charge pump circuit can realize therefore the high pressure resistant function of port is greatly reduced charge pump circuit and exists using low-voltage device
Area occupied in charging chip.
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
Disclosed attached drawing obtains other attached drawings.
Fig. 1 is a kind of circuit diagram of the charging chip of integrated overvoltage protection disclosed in the prior art；
Fig. 2 is a kind of circuit diagram of charging chip disclosed by the embodiments of the present invention；
Fig. 3 is a kind of circuit diagram of relatively conversion circuit disclosed by the embodiments of the present invention；
Fig. 4 is the circuit diagram of another relatively conversion 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.
The invention discloses a kind of charging chips, comprising: port protection circuit, clock circuit, in-line power circuit, charge
Pump circuit, relatively conversion circuit, charging control circuit, first switch tube, second switch and third switching tube, relatively turn
The USB port of circuit input end connection charging chip is changed, relatively the output end of conversion circuit connects charge pump circuit, relatively
Conversion circuit is used to detect the input voltage of USB port, is denoted as input voltage, when input voltage is more than default pressure voltage, increases
Add the phase-to-ground voltage exported to charge pump circuit, and the difference of phase-to-ground voltage and input voltage is not higher than preset pressure.This
After invention in charging chip by increasing relatively conversion circuit, charge pump circuit in charging chip using USB port as
Anode power input, using the phase-to-ground voltage of the output of relatively conversion circuit as negative terminal power input, so that charge pump is electric
Road can realize therefore the high pressure resistant function of port is greatly reduced charge pump circuit in charging chip using low-voltage device
In area occupied.
Referring to fig. 2, a kind of circuit diagram of charging chip, the charging chip disclosed in one embodiment of the invention include: port
Protect circuit 11, clock circuit 12, in-line power circuit 13, charge pump circuit 14, relatively conversion circuit 15, charge control electricity
Road 16, first switch tube Q1, second switch Q2 and third switching tube Q3.
Wherein:
The USB port of the input terminal connection charging chip of the port protection circuit 11, the port protection circuit 11
Output end connects the charge pump circuit 14, and the port protection circuit 11 is used to detect the input voltage of the USB port, and
When detecting the input voltage is overvoltage, the charge pump circuit 14 is turned off.
The output end of the clock circuit 12 connects the charge pump circuit 14, and the clock circuit 12 is used for the electricity
14 output clock pulse signal of lotus pump circuit.
The in-line power circuit 13 respectively with the clock circuit 12, the relatively conversion circuit 15 and the charging
Control circuit 16 connects, for being the clock circuit 12, the relatively conversion circuit 15 and the charging control circuit 16
The supply voltage VDD of safety is provided.
The output end of the charging control circuit 16 connects the control terminal of the third switching tube Q3, the third switching tube
The input terminal of Q3 connects system power supply port SYS, and the output end of the third switching tube Q3 connects battery, the charge control electricity
Road 16 is used for when charging chip is in charge mode, is controlled the third switching tube Q3 and is opened, by the defeated of the USB port
The output end BAT for entering voltage transmission to charging chip is battery charging.
The output end of the charge pump circuit 14 respectively with the control terminal of the first switch tube Q1 and the second switch
The control terminal of pipe Q2 connects, and the input terminal of the first switch tube Q1 connects the USB port, and the first switch tube Q1's is defeated
Outlet is connected with the output end of the second switch Q2, and the control terminal of the second switch Q2 connects system power supply port
SYS, the clock pulse signal that the charge pump circuit 14 is used to export using the clock circuit 12 is input signal, periodically
Charge and discharge are carried out to internal capacitance, and the input voltage of the USB port is amplified, and are driven using amplified voltage
The control terminal of the control terminal of the first switch tube Q1 and the second switch Q2.
Wherein, the first switch tube Q1 and second switch Q2 is NMOS tube.
The input terminal of the relatively conversion circuit 15 connects the USB port, the relatively conversion circuit 15 it is defeated
Outlet connects the charge pump circuit 14, and the relatively conversion circuit 15 is used to detect the input voltage of the USB port, when
When input voltage is more than default pressure voltage, increase the phase-to-ground voltage of output to the charge pump circuit 14, and it is described relatively
The difference of voltage and the input voltage is not higher than preset pressure.
Specifically, relatively converting in the present solution, relatively conversion circuit 15 are added in the previous stage in charge pump circuit 14
The input terminal of circuit 15 are as follows: the input voltage V of USB portUSBAnd the output V of in-line power circuit 13VDD, relatively convert
The output of circuit 15 is phase-to-ground voltage HVGND, and relatively conversion circuit 15 is used to detect the input voltage V of USB portUSB, when
Input voltage VUSBWhen more than default pressure voltage (such as 5V), phase-to-ground voltage HVGND can be with input voltage VUSBVariation, i.e. phase
Voltage-to-ground HVGND is with input voltage VUSBRaising and increase, also, phase-to-ground voltage HVGND and input voltage VUSB's
Difference is not higher than preset difference value (for example, 5V), i.e. VUSB-VHVGND≤ 5V, to guarantee rear class using the charge pump electricity of routine 5V device
Road 14 will not be damaged.
The value of default pressure voltage is determined according to the pressure voltage of conventional criteria device, such as 5V.
In summary, the invention discloses a kind of charging chips, comprising: port protection circuit 11, clock circuit 12, inside
Power supply circuit 13, charge pump circuit 14, relatively conversion circuit 15, charging control circuit 16, first switch tube Q1, second switch
Pipe Q2 and third switching tube Q3, relatively 15 input terminal of conversion circuit connects the USB port of charging chip, relatively conversion circuit
15 output end connects charge pump circuit 14, and relatively conversion circuit 15 is used to detect the input voltage of USB port, when input electricity
When pressure is more than default pressure voltage, increase the phase-to-ground voltage of output to charge pump circuit 14, and phase-to-ground voltage and input voltage
Difference be not higher than preset pressure.After the present invention in charging chip by increasing relatively conversion circuit 15, in charging chip
Charge pump circuit using USB port as anode power input, with the phase-to-ground voltage HVGND of the output of relatively conversion circuit
As negative terminal power input, so that charge pump circuit can realize the high pressure resistant function of port using low-voltage device, therefore, greatly
Reduce area occupied of the charge pump circuit in charging chip.
Referring to Fig. 3, the circuit diagram of the relatively conversion circuit of one kind disclosed in one embodiment of the invention, which includes: solid
Determine bias current sources IB, Zener diode ZD1, resistance R1, the 4th switching tube MN1, the 5th switching tube MN2, the 6th switching tube
MN3, the 7th switching tube HVMN3, the 8th switching tube HVMN4, the 9th switching tube HVMP1, the tenth switching tube HVMN5.
Wherein:
The input terminal of the fixed bias current source IB is for connecting the in-line power circuit 13, by in-line power circuit
13 output ends for providing the supply voltage VDD, the fixed bias current source IB of safety connect the 4th switching tube MN1, institute
The control terminal for stating the 4th switching tube MN1 connects the input terminal of the 4th switching tube MN1, the output of the 4th switching tube MN1
End ground connection.
The common end of the cathode of the Zener diode ZD1 and the resistance R1 are described for connecting with the USB port
The anode of Zener diode ZD1 connects the input terminal of the 8th switching tube HVMN4, institute with the common end CLP of the resistance R1
The control terminal for stating the 8th switching tube HVMN4 connects the input terminal of the fixed bias current source IB, the 8th switching tube HVMN4
Output end connect the input terminal of the 5th switching tube MN2, the control terminal connection the described 4th of the 5th switching tube MN2 is opened
Close the control terminal of pipe MN1, the output end ground connection of the 5th switching tube MN2.
The input terminal of the tenth switching tube HVMN5 is used to connect the USB port, the tenth switching tube HVMN5's
Control terminal connects the anode of the Zener diode ZD1 and the common end CLP of the resistance R1, the tenth switching tube HVMN5
Output end connect the input terminal of the 9th switching tube HVMP1, the control terminal connection of the 9th switching tube HVMP1 described the
The output end of the input terminal of eight switching tube HVMN4, the nine switching tubes HVMP1 connects the input terminal of the 6th switching tube MN3,
The control terminal of the 6th switching tube MN3 connects the input terminal of the 6th switching tube MN3, and the 6th switching tube MN3's is defeated
Outlet ground connection.
The control terminal of the 7th switching tube HVMN3 connects the control terminal of the 6th switching tube MN3, the 7th switch
The output end of pipe HVMN3 is grounded.
The input terminal of the 7th switching tube HVMN3, the input terminal of the 9th switching tube HVMP1 and the tenth switch
Output end of the common end of the output end of pipe HVMN5 as the relatively conversion circuit 15, for connecting the charge pump electricity
Road 14.
In the present embodiment, the 4th switching tube MN1, the 5th switching tube MN2 and the 6th switching tube MN3 are low pressure NMOS device,
Namely supply voltage is not higher than the NMOS device of predeterminated voltage (such as 5V).
7th switching tube HVMN3, the 8th switching tube HVMN4 and the tenth switching tube HVMN5 are high pressure resistant NMOS device, namely
The maximum breakdown voltage at drain terminal and source both ends is more than predeterminated voltage, such as 5V.
9th switching tube HVMP1 is that the maximum breakdown voltage at high pressure resistant PMOS device namely drain terminal and source both ends is more than
Predeterminated voltage, such as 5V.
The working principle of fixed bias current source IB are as follows: assuming that the mirror image ruler of the 4th switching tube MN1 and the 5th switching tube MN2
Very little ratio is k, and the electric current of fixed bias current source IB outflow is IB, then the electric current flowed through on resistance R1 is k*IB, in this way, setting R1
The maximum pressure drop at both ends is as follows:
VUSB-VCLP=VR1=k*IB*R1=5V the pressure resistance of rear class low-voltage device (be subject to), VUSBFor the input of USB port
Voltage, VCLPFor CLP node voltage, VR1For resistance R1 both end voltage；
Work as VUSB<VR1When, CLP node voltage is pulled to ground connection GND current potential, i.e. V by the 5th switching tube MN2 pipeCLP=0, at this point,
Phase-to-ground voltage VHVGND=0+VGSHVMP1, wherein VGSHVMP1For the gate source voltage of high pressure resistant the 9th switching tube HVMP1 of PMOS tube；
Work as VUSB>VR1When, CLP node voltage VCLP=VUSB-VR1≈VUSB- 5V, at this point, relatively conversion circuit export to
The phase-to-ground voltage V of charge pump circuit 14HVGND=VCLP+VGSHVMP1=VUSB-5V+VGSHVMP1。
Can be obtained by analyzing above, no matter the input voltage V of USB portUSBWhether the device pressure resistance of rear class low-voltage device is greater than
It is worth (such as 5V), relatively the voltage difference of the voltage and USB port at the output end of conversion circuit 15 namely the end HVGND is all rear
Within the scope of the pressure resistance of grade low-voltage device (such as 5V).
In summary, after increasing relatively conversion circuit 15 in charging chip, charge pump circuit in charging chip with
USB port is defeated using the phase-to-ground voltage HVGND of the output of relatively conversion circuit as negative terminal power supply as anode power input
Enter, so that charge pump circuit can realize the high pressure resistant function of port using low-voltage device, to be greatly reduced charge pump
Area occupied of the circuit in charging chip.
In order to further optimize the above embodiments, relatively conversion circuit can also include: the 11st switching tube HVMP2；
The input terminal of the 11st switching tube HVMP2 is for connecting the USB port, the 11st switching tube
The control terminal of HVMP2 connects the control terminal of the tenth switching tube HVMN5, and the output end of the 11st switching tube HVMP2 connects institute
The input terminal of the tenth switching tube HVMN5 is stated, the 11st switching tube HVMP2 is for preventing the tenth switching tube HVMN5 because of drain-source
Overtension and it is breakdown.
Wherein, the 11st switching tube HVMP2 is high pressure resistant PMOS device, and the 11st switching tube HVMP2 is for preventing the tenth
Switching tube HVMN5 is because drain-source voltage is excessively high and breakdown.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (7)
1. a kind of charging chip characterized by comprising port protection circuit, clock circuit, in-line power circuit, charge pump
Circuit, relatively conversion circuit, charging control circuit, first switch tube, second switch and third switching tube；
The USB port of the input terminal connection charging chip of the port protection circuit, the output end of the port protection circuit connect
The charge pump circuit is connect, the port protection circuit is used to detect the input voltage of the USB port, and described when detecting
When input voltage is overvoltage, the charge pump circuit is turned off；
The output end of the clock circuit connects the charge pump circuit, and the clock circuit is used for defeated to the charge pump circuit
Clock pulse signal out；
The in-line power circuit connects with the clock circuit, the relatively conversion circuit and the charging control circuit respectively
It connects, for providing safe supply voltage for the clock circuit, the relatively conversion circuit and the charging control circuit；
The output end of the charging control circuit connects the control terminal of the third switching tube, the input terminal of the third switching tube
System power supply port is connected, the output end of the third switching tube connects battery, and the charging control circuit described for filling
When electrical chip is in charge mode, controls the third switching tube and open, the voltage of the input and output of the USB port is passed
The output end of the charging chip is transported to as battery charging；
The control with the control terminal of the first switch tube and the second switch respectively of the output end of the charge pump circuit
The input terminal of end connection, the first switch tube connects the USB port, the output end of the first switch tube and described second
The output end of switching tube connects, and the control terminal of the second switch connects the system power supply port, the charge pump circuit
Clock pulse signal for being exported using the clock circuit periodically carries out charge and discharge to internal capacitance as input signal,
And the input voltage of the USB port is amplified, and the control of the first switch tube is driven using amplified voltage
The control terminal at end and the second switch；
The input terminal of the relatively conversion circuit connects the USB port, the output end connection of the relatively conversion circuit
The charge pump circuit, the relatively conversion circuit is used to detect the input voltage of the USB port, when the input voltage
When more than default pressure voltage, increase the phase-to-ground voltage of output to the charge pump circuit, and the phase-to-ground voltage and described
The difference of input voltage is not higher than preset pressure.
2. charging chip according to claim 1, which is characterized in that the first switch tube and the second switch are equal
For NMOS tube.
3. charging chip according to claim 1, which is characterized in that the relatively conversion circuit includes: fixed bias
Current source, Zener diode, resistance, the 4th switching tube, the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switch
Pipe, the 9th switching tube, the tenth switching tube；
The input terminal in the fixed bias current source provides safety for connecting the in-line power circuit, by in-line power circuit
Supply voltage, the output end in the fixed bias current source connects the 4th switching tube, the control of the 4th switching tube
End connects the input terminal of the 4th switching tube, the output end ground connection of the 4th switching tube；
The common end of the cathode of the Zener diode and the resistance with the USB port for connecting, two pole of Zener
The anode of pipe connects the input terminal of the 8th switching tube with the common end of the resistance, and the control terminal of the 8th switching tube connects
The input terminal in the fixed bias current source is connect, the output end of the 8th switching tube connects the input of the 5th switching tube
End, the control terminal of the 5th switching tube connect the control terminal of the 4th switching tube, the output termination of the 5th switching tube
Ground；
The input terminal of tenth switching tube is for connecting the USB port, described in the control terminal connection of the tenth switching tube
The output end of the common end of the anode of Zener diode and the resistance, the tenth switching tube connects the 9th switching tube
Input terminal, the control terminal of the 9th switching tube connect the input terminal of the 8th switching tube, the output end of nine switching tube
The input terminal of the 6th switching tube is connected, the control terminal of the 6th switching tube connects the input terminal of the 6th switching tube,
The output end of 6th switching tube is grounded；
The control terminal of 7th switching tube connects the control terminal of the 6th switching tube, the output termination of the 7th switching tube
Ground；
The public affairs of the output end of the input terminal of 7th switching tube, the input terminal of the 9th switching tube and the tenth switching tube
Output end of the end as the relatively conversion circuit altogether, for connecting the charge pump circuit.
4. charging chip according to claim 3, which is characterized in that the 4th switching tube, the 5th switching tube and
6th switching tube is low pressure NMOS device.
5. charging chip according to claim 3, which is characterized in that the 7th switching tube, the 8th switching tube and
Tenth switching tube is high pressure resistant NMOS device；9th switching tube is high pressure resistant PMOS device.
6. charging chip according to claim 3, which is characterized in that the relatively conversion circuit further include: the 11st
Switching tube；
The input terminal of 11st switching tube is for connecting the USB port, the control terminal connection of the 11st switching tube
The control terminal of tenth switching tube, the output end of the 11st switching tube connect the input terminal of the tenth switching tube, and described
11 switching tubes are for preventing the tenth switching tube because drain-source voltage is excessively high and breakdown.
7. charging chip according to claim 6, which is characterized in that the 11st switching tube is high pressure resistant PMOS device
Part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910697059.3A CN110417087B (en) | 2019-07-30 | 2019-07-30 | Charging chip |
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| CN201910697059.3A CN110417087B (en) | 2019-07-30 | 2019-07-30 | Charging chip |
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| CN110417087A true CN110417087A (en) | 2019-11-05 |
| CN110417087B CN110417087B (en) | 2023-04-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880737A (en) * | 2019-11-29 | 2020-03-13 | 上海艾为电子技术股份有限公司 | Charging chip, overvoltage protection circuit thereof and portable electronic equipment |
| EP4201732A1 (en) * | 2021-12-22 | 2023-06-28 | Valeo Systèmes de Contrôle Moteur | A pre-charging device, a voltage converter and an electrified vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020017873A1 (en) * | 2000-03-30 | 2002-02-14 | Rabine Robert C. | Switching circuit with overload protection |
| US20080174360A1 (en) * | 2007-01-23 | 2008-07-24 | Etron Technology, Inc. | Charge pump circuit for high voltage generation |
| CN102594130A (en) * | 2011-01-10 | 2012-07-18 | 中兴通讯股份有限公司 | Method for outputting constant difference voltage and charge pump circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020017873A1 (en) * | 2000-03-30 | 2002-02-14 | Rabine Robert C. | Switching circuit with overload protection |
| US20080174360A1 (en) * | 2007-01-23 | 2008-07-24 | Etron Technology, Inc. | Charge pump circuit for high voltage generation |
| CN102594130A (en) * | 2011-01-10 | 2012-07-18 | 中兴通讯股份有限公司 | Method for outputting constant difference voltage and charge pump circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880737A (en) * | 2019-11-29 | 2020-03-13 | 上海艾为电子技术股份有限公司 | Charging chip, overvoltage protection circuit thereof and portable electronic equipment |
| CN110880737B (en) * | 2019-11-29 | 2022-09-27 | 上海艾为电子技术股份有限公司 | Charging chip, overvoltage protection circuit thereof and portable electronic equipment |
| EP4201732A1 (en) * | 2021-12-22 | 2023-06-28 | Valeo Systèmes de Contrôle Moteur | A pre-charging device, a voltage converter and an electrified vehicle |
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| Publication number | Publication date |
|---|---|
| CN110417087B (en) | 2023-04-14 |
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