CN109638798B - Protection circuit of switch charging chip and switch charging circuit - Google Patents
Protection circuit of switch charging chip and switch charging circuit Download PDFInfo
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- CN109638798B CN109638798B CN201811593002.0A CN201811593002A CN109638798B CN 109638798 B CN109638798 B CN 109638798B CN 201811593002 A CN201811593002 A CN 201811593002A CN 109638798 B CN109638798 B CN 109638798B
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- 238000012545 processing Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 12
- 230000005669 field effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 101100194362 Schizosaccharomyces pombe (strain 972 / ATCC 24843) res1 gene Proteins 0.000 description 3
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Classifications
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- 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
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- H02J7/0026—
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a protection circuit of a switch charging chip and a switch charging circuit. The detection unit is used for conducting under the action of the first trigger voltage and comparing the voltage of the voltage drop of the voltage to be detected with the second trigger voltage in a conducting state; if the voltage of the voltage to be detected passing through the voltage drop is larger than the second trigger voltage, outputting a control signal to control the grid voltage of a first switching tube in the switch charging chip to be pulled down to be smaller than the second trigger voltage, wherein the first switching tube is used for controlling the on-off of the input end and the output port of the switch charging chip. When the gate-source voltage of the first switching tube is too high, the disclosed circuit controls the gate voltage of the first switching tube to be pulled down to be smaller than the second trigger voltage, protects the switch charging chip and ensures the normal operation of the switch charging chip.
Description
Technical Field
The present invention relates to the field of integrated circuits, and in particular, to a protection circuit for a switch charging chip and a switch charging circuit.
Background
Along with the diversification development of portable electronic products, the requirements on the switch charging chip are also higher and higher. The current switch charging chip supports 9V and 12V high voltage charging in addition to basic 5V normal voltage charging.
During the charging process of the switch charging chip, an abnormal condition may occur, and for this purpose, a corresponding protection circuit needs to be designed for the switch charging chip. In the prior art, the protection circuit of the switch charging chip considers the problems of positive and negative overshoot of the input end of the switch charging chip, overhigh temperature of the switch charging chip, output short circuit and the like in design. However, the protection circuit of the conventional switch charging chip is designed without considering the case that the input terminal is suddenly shorted to the ground.
In the charging process of the switch charging chip, when the input end is suddenly shorted to the ground, the gate-source voltage of a first switching tube in the switch charging chip is too high, so that gate oxide breakdown is caused, the first switching tube is damaged, and the switch charging chip cannot work normally.
Disclosure of Invention
Based on the defects in the prior art, the invention provides a circuit for protecting a switch charging chip and a switch charging circuit, so that when the gate-source voltage of a first switch tube is too high, the gate voltage of the first switch tube is controlled to be pulled down to be smaller than a second trigger voltage, the switch charging chip is protected, and the switch charging chip is ensured to work normally.
In order to achieve the above object, the following solutions have been proposed:
the first aspect of the invention discloses a protection circuit of a switch charging chip, which comprises:
the device comprises a trigger unit and a detection unit connected with the trigger unit;
the trigger unit is used for respectively receiving a first trigger voltage and an input voltage, is conducted under the action of the first trigger voltage, and generates and outputs a second trigger voltage according to the input voltage in a conducting state;
the detection unit is used for respectively receiving the first trigger voltage, the voltage to be detected and the second trigger voltage, is conducted under the action of the first trigger voltage, and compares the voltage of the voltage to be detected, which is subjected to voltage drop, with the second trigger voltage in a conducting state; if the voltage of the voltage to be detected passing through the voltage drop is larger than the second trigger voltage, outputting a control signal to control the grid voltage of a first switching tube in the switch charging chip to be pulled down to be smaller than the second trigger voltage, wherein the first switching tube is used for controlling the on-off of the input end and the output port of the switch charging chip.
Optionally, the trigger unit includes:
the first protection resistor, the first switch and the second switch;
one end of the first protection resistor receives the input voltage, the other end of the first protection resistor is connected with the first end of the second switch, the second end of the second switch is connected with the second end of the first switch, the control end of the second switch is connected with the detection unit, the first end of the first switch is grounded, and the control end of the first switch receives the first trigger voltage;
the common terminal of the second switch and the detection unit is connected with the common terminal of the second switch and the first switch.
Optionally, the detection unit includes:
the second protection resistor, the detection resistor, the third switch and the fourth switch;
one end of the second protection resistor receives the voltage to be detected, the other end of the second protection resistor is connected with the detection resistor, the other end of the detection resistor is connected with the first end of the fourth switch, the second end of the fourth switch is connected with the second end of the third switch, the control end of the fourth switch is connected with the trigger unit and receives the second trigger voltage, the first end of the third switch is grounded, and the control end of the third switch receives the first trigger voltage;
and the common end of the third switch, which is grounded, is used for outputting the control signal.
Optionally, the protection circuit of the switch charging chip further includes:
and the inverting unit is connected with the detecting unit and is used for receiving the control signal and outputting a processing result of the control signal passing through the inverting unit.
Optionally, the inverting unit includes:
a first inverter and a second inverter;
one end of the first inverter is connected with the detection unit, the other end of the first inverter is connected with one end of the second inverter, and the other end of the second inverter outputs the control signal.
Optionally, the protection circuit of the switch charging chip further includes:
a control gate connected to the second inverter;
the control gate receives an enabling signal and the control signal respectively, and if the enabling signal and the control signal meet preset requirements, the control gate controls the grid voltage of the first switching tube to be pulled down to be smaller than the second trigger voltage;
the predetermined requirement is used for reflecting that the voltage of the voltage to be detected, which is subjected to voltage drop, is larger than the second trigger voltage.
Optionally, the protection circuit of the switch charging chip further includes:
a control gate connected to the detection unit;
the control gate receives an enabling signal and the control signal respectively, and if the enabling signal and the control signal meet preset requirements, the control gate controls the grid voltage of the first switching tube to be pulled down to be smaller than the second trigger voltage;
the predetermined requirement is used for reflecting that the voltage of the voltage to be detected, which is subjected to voltage drop, is larger than the second trigger voltage.
The second aspect of the present invention discloses a switch charging circuit comprising:
a switch charging chip, and a protection circuit of any one of the switch charging chips disclosed in the first aspect of the present invention; the switch charging chip is connected with the protection circuit of the switch charging chip.
Optionally, the driving unit in the switch charging chip is connected to the protection circuit of the switch charging chip, and is configured to receive the control signal output by the protection circuit of the switch charging chip, and control the gate voltage of the first switch tube to be pulled down to be smaller than the second trigger voltage according to the control signal.
Optionally, the driving unit includes:
the third protection resistor, the voltage stabilizing diode, the charge pump and the second switching tube;
the first end of the second switching tube is grounded, the second end of the second switching tube is connected with the control end of the first switching tube, and the control end of the second switching tube is connected with the protection circuit of the switch charging chip;
one end of the third protection resistor receives the first trigger voltage, and the other end of the third protection resistor is grounded through the zener diode;
the first input end of the charge pump is connected with the common end of the third protection resistor and the zener diode, the second input end of the charge pump receives the first trigger voltage, and the output end of the charge pump is connected with the second end of the second switching tube.
According to the technical scheme, the protection circuit and the switch charging circuit of the switch charging chip provided by the invention are characterized in that the voltage of the voltage to be detected passing through the voltage drop is compared with the second trigger voltage through the trigger unit and the detection unit connected with the trigger unit, when the voltage of the voltage to be detected passing through the voltage drop is larger than the second trigger voltage, the output control signal is used for controlling the grid voltage of the first switch tube in the switch charging chip to be pulled down to be smaller than the second trigger voltage, and the first switch tube is used for controlling the on-off of the input end and the output port of the switch charging chip, so that the grid voltage of the first switch tube is controlled to be pulled down to be smaller than the second trigger voltage when the grid source voltage of the first switch tube is too high, and the switch charging chip is protected, and the normal operation of the switch charging chip is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a switch charging chip;
fig. 2 is a schematic diagram of a protection circuit of a switch charging chip according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a protection circuit of another switch charging chip according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a protection circuit of another switch charging chip according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a protection circuit of another switch charging chip according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating another protection circuit for a switch charging chip according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a protection circuit of another switch charging chip according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a switch charging circuit according to an embodiment of the present invention;
fig. 9 shows another switch charging circuit according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the port VBUS in the switch charging chip is connected to the input terminal, i.e., to the USB port. During charging, port VBUS may be suddenly shorted to ground because it is connected to the USB port. If the port VBUS is suddenly shorted to ground, the gate-source voltage of the first switching transistor Q1 is a very high voltage. In general, the gate-source voltage of the MOS field effect transistor is too high, which causes gate oxide breakdown of the MOS field effect transistor and damages the MOS field effect transistor. Therefore, the first switching tube Q1 is easily damaged in this case.
Aiming at the problems, a corresponding protection circuit is required to be designed for the switch charging chip, and the invention provides the protection circuit and the switch charging circuit of the switch charging chip, so that when the gate-source voltage of a first switch tube is too high, the gate voltage of the first switch tube is controlled to be pulled down to be smaller than a second trigger voltage, the switch charging chip is protected, and the normal operation of the switch charging chip is ensured.
Referring to fig. 2, an embodiment of the invention discloses a protection circuit of a switch charging chip, which comprises:
a trigger unit 201, and a detection unit 202 connected to the trigger unit 201.
The trigger unit 201 is configured to receive a first trigger voltage and an input voltage, and the trigger unit 201 is turned on under the action of the first trigger voltage and generates and outputs a second trigger voltage according to the input voltage in a turned-on state.
The detecting unit 202 is configured to receive the first trigger voltage, the voltage to be detected, and the second trigger voltage, and the detecting unit 202 is turned on under the action of the first trigger voltage, and compares the voltage of the voltage drop of the voltage to be detected with the second trigger voltage in the on state. The voltage drop refers to a change in voltage of the current after passing through the load relative to the voltage before not passing through the load. If the voltage of the voltage to be detected passing through the voltage drop is larger than the second trigger voltage, outputting a control signal to control the grid voltage of a first switching tube in the switch charging chip to be pulled down to be smaller than the second trigger voltage, wherein the first switching tube is used for controlling the on-off of the input end and the output port of the switch charging chip.
In general, the first switching transistor may be an NMOS field effect transistor. It should be noted that, the voltage to be detected is the gate voltage of the first switching tube, the input voltage is the voltage of the input end, and the voltage of the input end may also be the first trigger voltage.
According to the protection circuit of the switch charging chip, the trigger unit 201 and the detection unit 202 connected with the trigger unit 201 are used for comparing the voltage of the voltage to be detected, which is subjected to voltage drop, with the second trigger voltage, when the voltage of the voltage to be detected, which is subjected to voltage drop, is larger than the second trigger voltage, the output control signal is used for controlling the grid voltage of the first switch tube in the switch charging chip to be pulled down to be smaller than the second trigger voltage, and the first switch tube is used for controlling the on-off of the input end and the output end of the switch charging chip, so that when the grid source voltage of the first switch tube is too high, the grid voltage of the first switch tube is controlled to be pulled down to be smaller than the second trigger voltage, the switch charging chip is protected, and normal operation of the switch charging chip is ensured.
Optionally, referring to fig. 3, in another embodiment of the present invention, an implementation of the trigger unit 301 includes:
a first protection resistor RES1, a first switch S1, and a second switch S2.
Wherein: one end of the first protection resistor RES1 receives an input voltage, the other end of the first protection resistor RES1 is connected with the first end of the second switch S2, the second end of the second switch S2 is connected with the second end of the first switch S1, the control end of the second switch S2 is connected with the detection unit 302, the first end of the first switch S1 is grounded, and the control end of the first switch S1 receives a first trigger voltage. The common terminal of the second switch S2 and the detecting unit 302 is connected to the common terminal of the second switch S2 and the first switch S1.
It should be noted that the first switch S1 may be an NMOS field effect transistor, and the second switch S2 may be a PMOS field effect transistor. The first end of the first switch S1 is used as a source electrode, the second end of the first switch S1 is used as a drain electrode, and the control end of the first switch S1 is used as a gate electrode. Similarly, the first end of the second switch S2 serves as a source, the second end of the second switch S2 serves as a drain, and the control end of the second switch S2 serves as a gate.
When the gate of the first switch S1 receives the first trigger voltage and the source voltage of the first switch S1 is the ground voltage, the gate voltage of the first switch S1 is greater than the source voltage, and the first switch S1 is turned on. After the first switch S1 is turned on, the trigger unit 301 forms a path, generates a second trigger voltage at a common terminal of the second switch S2 and the detection unit 302, and outputs the second trigger voltage to the detection unit 302. Meanwhile, the source electrode of the second switch S2 receives an input voltage, the gate electrode of the second switch S2 receives a second trigger voltage, the second trigger voltage is a ground voltage, the source electrode voltage of the second switch S2 is greater than the gate voltage, and the second switch S2 is turned on.
Optionally, referring to fig. 3, in another embodiment of the present invention, an implementation of the detection unit 302 includes:
a second protection resistor RES2, a detection resistor R, a third switch S3, and a fourth switch S4.
Wherein: one end of the second protection resistor RES2 receives the voltage to be detected, the other end of the second protection resistor RES2 is connected with the detection resistor R, the other end of the detection resistor R is connected with the first end of the fourth switch S4, the second end of the fourth switch S4 is connected with the second end of the third switch S3, the control end of the fourth switch S4 is connected with the trigger unit 301 and receives the second trigger voltage, the first end of the third switch S3 is grounded, and the control end of the third switch S3 receives the first trigger voltage. The third switch S3 is grounded at a common terminal, and is configured to output a control signal.
It should be noted that the third switch S3 may be an NMOS field effect transistor, and the fourth switch S4 may be a PMOS field effect transistor. The first end of the third switch S3 serves as a source, the second end of the third switch S3 serves as a drain, and the control end of the third switch S3 serves as a gate. Similarly, the first end of the fourth switch S4 serves as a source, the second end of the fourth switch S4 serves as a drain, and the control end of the fourth switch S4 serves as a gate. The detection resistor R can be selected to be proper according to the requirements.
The gate of the third switch S3 receives the first trigger voltage, and when the source voltage of the third switch S3 is the ground voltage, the gate voltage of the third switch S3 is greater than the source voltage, and the third switch S3 is turned on. Meanwhile, the gate of the fourth switch S4 receives the second trigger voltage, and the source of the fourth switch S4 receives the voltage of the voltage drop of the voltage to be detected. It should be noted that the voltage to be detected consumes a corresponding voltage through the detection resistor R, that is, the voltage of the voltage to be detected passing through the detection resistor R is the voltage of the voltage drop of the voltage to be detected. If the source voltage of the fourth switch S4 is greater than the gate voltage, the fourth switch S4 is turned on, the detection unit 302 forms a path, and the grounded common terminal of the third switch S3 outputs a control signal to control the gate voltage of the first switch tube in the switch charging chip to be pulled down to be less than the second trigger voltage.
Referring to fig. 4, an embodiment of the present invention discloses another protection circuit of a switch charging chip, including:
a trigger unit 401, a detection unit 402, and an inversion unit 403 connected to the detection unit 402.
The execution process and principle of the trigger unit 401 and the detection unit 402 are the same as those of the trigger unit 301 and the detection unit 302 in fig. 3, and will not be described herein.
An inverting unit 403 for receiving the control signal and outputting the processing result of the control signal through the inverting unit.
The processing result of the control signal through the inverting unit is the same as that of the unprocessed control signal.
Optionally, referring to fig. 5, one embodiment of the inverting unit 503 includes:
a first inverter and a second inverter.
One end of the first inverter is connected with the detection unit 502, the other end of the first inverter is connected with one end of the second inverter, and the other end of the second inverter outputs a control signal.
It should be noted that, the detecting unit 502 outputs a control signal to the first inverter, the control signal passes through the first inverter, and then passes through the second inverter connected to the first inverter, and the second inverter outputs the control signal.
Referring to fig. 6, an embodiment of the present invention discloses another protection circuit of a switch charging chip, including:
the trigger unit 601, the detection unit 602, the first inverter, the second inverter and the control gate connected with the second inverter.
The execution process and principle of the trigger unit 601 and the detection unit 602 are the same as those of the trigger unit 301 and the detection unit 302 in fig. 3, and will not be described herein. The implementation and principle of the first inverter and the second inverter are the same as those of the first inverter and the second inverter in fig. 5, and will not be described again here.
The control gate receives the enabling signal and the control signal respectively, and if the enabling signal and the control signal meet the preset requirement, the control gate controls the grid voltage of the first switching tube to be pulled down to be smaller than the second trigger voltage. The predetermined requirement is for the voltage reflecting the voltage drop across the voltage to be detected to be greater than the second trigger voltage.
Referring to fig. 7, an embodiment of the present invention discloses another protection circuit of a switch charging chip, including:
the trigger unit 701, the detection unit 702 and the control gate connected with the detection unit 702.
The execution process and principle of the trigger unit 701 and the detection unit 702 are the same as those of the trigger unit 301 and the detection unit 302 in fig. 3, and will not be described herein.
The control gate receives the enabling signal and the control signal respectively, and if the enabling signal and the control signal meet the preset requirement, the control gate controls the grid voltage of the first switching tube to be pulled down to be smaller than the second trigger voltage. The predetermined requirement is for the voltage reflecting the voltage drop across the voltage to be detected to be greater than the second trigger voltage.
Referring to fig. 8, an embodiment of the invention discloses a switch charging circuit, which comprises:
a switch charging chip 801 and a protection circuit 802 for the switch charging chip. The switch charging chip 801 is connected to a protection circuit 802 of the switch charging chip.
The specific implementation process of the protection circuit of the switch charging chip is consistent with the implementation principle and the protection circuit of the switch charging chip shown in the above embodiment, which will be referred to herein and will not be described herein again.
It should be noted that, the driving unit in the switch charging chip 801 is connected to the protection circuit 802 of the switch charging chip, and is configured to receive a control signal output by the protection circuit 802 of the switch charging chip, and control the gate voltage of the first switch tube to be pulled down to be smaller than the second trigger voltage according to the control signal.
Alternatively, referring to fig. 9, one embodiment of the driving unit 901 includes:
the third protection resistor R3, the zener diode, the charge pump and the second switching tube Q2.
Optionally, one connection mode is: the first end of the second switching tube Q2 is grounded, the second end of the second switching tube Q2 is connected with the control end of the first switching tube Q1, and the control end of the second switching tube Q2 is connected with the protection circuit 902 of the switch charging chip.
One end of the third protection resistor R3 receives the first trigger voltage, and the other end is grounded through a zener diode.
The first input end of the charge pump is connected with the common end of the third protection resistor R3 and the zener diode, the second input end receives the first trigger voltage, and the output end is connected with the second end of the second switching tube Q2.
It should be noted that the second switching tube Q2 may be an NMOS field effect tube, where the first end of the second switching tube Q2 is a source, the second end is a drain, and the control end is a gate. The first end of the first switch tube is a source electrode, the second end is a drain electrode, and the control end is a grid electrode.
The charge pump outputs a voltage that is the gate voltage of the first switching transistor Q1, and the source voltage of the first switching transistor Q1 is the voltage of the input terminal. Since the gate voltage is greater than the source voltage and the voltage output by the charge pump is greater than the voltage at the input terminal when the first switching transistor Q1 is turned on, the voltage output by the charge pump is a relatively large voltage.
When the input terminal is suddenly shorted to the ground, the gate-source voltage of the first switching tube Q1 is the voltage output by the charge pump. If the gate-source voltage of the first switching tube Q1 is too high, the first switching tube Q1 is damaged. At this time, the control signal outputted from the protection circuit 902 of the switch charging chip indicates that the gate voltage of the first switching transistor Q1 needs to be pulled down to be smaller than the second trigger voltage. The control end of the second switching tube Q2 receives the control signal, the second switching tube Q2 is conducted, and the grid voltage of the first switching tube Q1 is controlled to be pulled down to be smaller than the second trigger voltage. At this time, the gate-source voltage of the first switching tube is not too high, and the first switching tube is not damaged.
Those skilled in the art will be able to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A protection circuit for a switch charging chip, comprising:
the device comprises a trigger unit and a detection unit connected with the trigger unit;
the trigger unit is used for respectively receiving a first trigger voltage and an input voltage, is conducted under the action of the first trigger voltage, and generates and outputs a second trigger voltage according to the input voltage in a conducting state;
the detection unit is used for respectively receiving the first trigger voltage, the voltage to be detected and the second trigger voltage, is conducted under the action of the first trigger voltage, and compares the voltage of the voltage to be detected, which is subjected to voltage drop, with the second trigger voltage in a conducting state; if the voltage of the voltage to be detected passing through the voltage drop is larger than the second trigger voltage, outputting a control signal to control the grid voltage of a first switching tube in the switch charging chip to be pulled down to be smaller than the second trigger voltage, wherein the first switching tube is used for controlling the on-off of an input end and an output port of the switch charging chip; the voltage to be detected is the grid voltage of the first switch tube.
2. The circuit of claim 1, wherein the trigger unit comprises:
the first protection resistor, the first switch and the second switch;
one end of the first protection resistor receives the input voltage, the other end of the first protection resistor is connected with the first end of the second switch, the second end of the second switch is connected with the second end of the first switch, the control end of the second switch is connected with the detection unit, the first end of the first switch is grounded, and the control end of the first switch receives the first trigger voltage;
the common terminal of the second switch and the detection unit is connected with the common terminal of the second switch and the first switch.
3. The circuit of claim 1, wherein the detection unit comprises:
the second protection resistor, the detection resistor, the third switch and the fourth switch;
one end of the second protection resistor receives the voltage to be detected, the other end of the second protection resistor is connected with the detection resistor, the other end of the detection resistor is connected with the first end of the fourth switch, the second end of the fourth switch is connected with the second end of the third switch, the control end of the fourth switch is connected with the trigger unit and receives the second trigger voltage, the first end of the third switch is grounded, and the control end of the third switch receives the first trigger voltage;
and the common end of the third switch, which is grounded, is used for outputting the control signal.
4. The circuit of claim 1, further comprising:
and the inverting unit is connected with the detecting unit and is used for receiving the control signal and outputting a processing result of the control signal passing through the inverting unit.
5. The circuit of claim 4, wherein the inverting unit comprises:
a first inverter and a second inverter;
one end of the first inverter is connected with the detection unit, the other end of the first inverter is connected with one end of the second inverter, and the other end of the second inverter outputs the control signal.
6. The circuit of claim 5, further comprising:
a control gate connected to the second inverter;
the control gate receives an enabling signal and the control signal respectively, and if the enabling signal and the control signal meet preset requirements, the control gate controls the grid voltage of the first switching tube to be pulled down to be smaller than the second trigger voltage;
the predetermined requirement is used for reflecting that the voltage of the voltage to be detected, which is subjected to voltage drop, is larger than the second trigger voltage.
7. The circuit of claim 1, further comprising:
a control gate connected to the detection unit;
the control gate receives an enabling signal and the control signal respectively, and if the enabling signal and the control signal meet preset requirements, the control gate controls the grid voltage of the first switching tube to be pulled down to be smaller than the second trigger voltage;
the predetermined requirement is used for reflecting that the voltage of the voltage to be detected, which is subjected to voltage drop, is larger than the second trigger voltage.
8. A switch charging circuit, comprising:
a switch charging chip, and a protection circuit of the switch charging chip as claimed in any one of claims 1 to 6; the switch charging chip is connected with the protection circuit of the switch charging chip.
9. The circuit of claim 8, wherein the driving unit in the switch charging chip is connected to the protection circuit of the switch charging chip, and is configured to receive the control signal output by the protection circuit of the switch charging chip, and control the gate voltage of the first switch tube to be pulled down to be less than the second trigger voltage according to the control signal.
10. The circuit of claim 9, wherein the drive unit comprises:
the third protection resistor, the voltage stabilizing diode, the charge pump and the second switching tube;
the first end of the second switching tube is grounded, the second end of the second switching tube is connected with the control end of the first switching tube, and the control end of the second switching tube is connected with the protection circuit of the switch charging chip;
one end of the third protection resistor receives the first trigger voltage, and the other end of the third protection resistor is grounded through the zener diode;
the first input end of the charge pump is connected with the common end of the third protection resistor and the zener diode, the second input end of the charge pump receives the first trigger voltage, and the output end of the charge pump is connected with the second end of the second switching tube.
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 |
Applications Claiming Priority (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 |
Publications (2)
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| CN111654085B (en) * | 2020-06-17 | 2022-09-02 | 上海艾为电子技术股份有限公司 | Charging circuit and electronic equipment |
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