CN114204534A - Overvoltage and overcurrent protection circuit, lithium battery charger front-end circuit and starting method - Google Patents
Overvoltage and overcurrent protection circuit, lithium battery charger front-end circuit and starting method Download PDFInfo
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- CN114204534A CN114204534A CN202210137343.7A CN202210137343A CN114204534A CN 114204534 A CN114204534 A CN 114204534A CN 202210137343 A CN202210137343 A CN 202210137343A CN 114204534 A CN114204534 A CN 114204534A
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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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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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
- H02J7/00304—Overcurrent protection
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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
- H02J7/00308—Overvoltage protection
Abstract
The invention provides an overvoltage and overcurrent protection circuit, which comprises: the circuit comprises an enabling signal circuit, a first current limiting circuit connected with a first signal output end of the enabling signal circuit, and a second current limiting circuit connected with a second signal output end of the enabling signal circuit; the enabling signal circuit is used for switching the start of the first current limiting circuit and the second current limiting circuit, the first current limiting circuit is started when the output short circuit is started, and the second current limiting circuit is started when the output load is started. Compared with the traditional overvoltage and overcurrent protection circuit, the high-precision current limiting circuit can meet high-precision current limiting values under different working conditions.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to an overvoltage and overcurrent protection circuit, a lithium battery charger front-end circuit and a starting method.
Background
The lithium ion battery has the advantages of long service life, high charging speed, large capacity and the like, so the lithium ion battery is widely applied to portable equipment. However, lithium ion batteries have problems of safety, overcharge, and the like, and an overvoltage/overcurrent integrated circuit IC is widely used as a front end application of a lithium ion battery charger.
The overvoltage and overcurrent integrated circuit IC can realize various protection functions, such as input high voltage resistance, input power supply overvoltage protection, load current limiting protection, IC overheating protection, output short circuit protection and the like. An overvoltage and overcurrent integrated circuit is typically applied as shown in fig. 1, wherein U0 is an overvoltage and overcurrent protection IC, and M0 is a power tube between an input and an output; the power tube M0 is generally an NMOS, which has higher electron mobility and smaller on-resistance value in the same area compared to a PMOS; meanwhile, the NMOS has higher power supply rejection capability.
U0 is connected with a resistor R through an external resistorILIMTo limit the load current when the load current is less than RILIMWhen the current limiting value IOCP is set, the load current depends on the load end; when the load current is larger than RILIMAt the set current limit value, the load current will be limited to IOCP and maintained for a certain time, and then the power tube M0 will be turned off. The back-end system usually requires that the U0 has a high-precision current-limiting value, and the current overvoltage and overcurrent protection circuit cannot meet the high-precision current-limiting value under different working conditions.
Disclosure of Invention
The present invention is directed to overcoming at least one of the problems set forth above and providing an over-voltage and over-current protection circuit.
In order to achieve the above object, the present invention provides an over-voltage and over-current protection circuit, including: the circuit comprises an enabling signal circuit, a first current limiting circuit connected with a first signal output end of the enabling signal circuit, and a second current limiting circuit connected with a second signal output end of the enabling signal circuit;
the enabling signal circuit is used for switching the start of the first current limiting circuit and the second current limiting circuit, the first current limiting circuit is started when the output short circuit is started, and the second current limiting circuit is started when the output load is started.
Preferably, the first current limiting circuit is a clamp circuit provided with a sampling tube and a clamp power tube.
Preferably, the first current limiting circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first amplifier, a second amplifier, a first sampling tube, a second sampling tube, a power tube, a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube and a fifth MOS tube;
the positive input end of the first amplifier is connected with a first reference voltage, and the output end of the first amplifier is connected with the grid electrode of the fourth MOS tube;
the drain electrode of the fourth MOS tube is connected with the source electrode of the fifth MOS tube, the grid electrode of the fifth MOS tube is connected with the first signal output end of the enabling signal circuit, and the source electrode of the fourth MOS tube is grounded;
the drain electrode of the fifth MOS tube is connected with the drain electrode of the second MOS tube and is connected to the second resistor in series, and the source electrode of the second MOS tube is connected to the negative input end of the second amplifier;
the gates of the first MOS tube, the second MOS tube and the third MOS tube are connected with each other, the source electrode of the third MOS tube is connected to the positive input end of the second amplifier, the source electrode of the first MOS tube is grounded, and the drain electrodes of the first MOS tube, the second MOS tube and the third MOS tube are respectively connected in series with a first resistor, a second resistor and a third resistor and connected to the drain electrode of the power tube;
the output end of the second amplifier is connected to the grid electrode of the power tube, the drain electrodes of the first sampling tube and the second sampling tube are respectively connected with the third resistor and the first resistor in series, the source electrodes of the first sampling tube and the second sampling tube are connected with the source electrode of the power tube, the grid electrodes of the first sampling tube and the second sampling tube are connected with each other and connected to the grid electrode of the power tube, the source electrode of the power tube is connected to the load resistor and is grounded, and the load resistor is further connected with an output capacitor in parallel.
Preferably, the second current limiting circuit is provided with a clamping circuit for clamping the power tube and a sampling tube.
Preferably, the second current limiting circuit includes:
the logic control unit, a third sampling tube, a third amplifier, a fourth amplifier, a sixth MOS tube, a seventh MOS tube and a power tube shared by the first current limiting circuit;
the positive input end of the logic control unit is connected with a second reference voltage, the output end of the logic control unit is connected with the grid electrode of the third sampling tube, the drain electrode of the third sampling tube is connected with the drain electrode of the power tube, and the source electrode of the third sampling tube is connected with the drain electrode of the sixth MOS tube;
the source electrode of the sixth MOS tube is connected with the drain electrode of the seventh MOS tube, the grid electrode of the seventh MOS tube is connected with the second signal output end of the enabling signal circuit, and the source electrode of the seventh MOS tube is connected with the negative input end of the third amplifier, the positive input end of the logic control unit and the negative input end of the first amplifier;
the positive input end of the fourth amplifier is connected to the source electrode of the power tube, the negative input end of the fourth amplifier is connected to the source electrode of the third sampling tube, and the output end of the fourth amplifier is connected to the gate electrode of the sixth MOS tube.
Preferably, the logic control unit includes: a second comparator and a logic drive circuit.
Preferably, the enable signal circuit includes: the positive input end of the first comparator is connected with a third reference voltage, and the negative input end of the first comparator is connected with the source electrode of the power tube.
The invention also provides a front-end circuit for a lithium battery charger, which comprises an overvoltage and overcurrent protection circuit, wherein the overvoltage and overcurrent protection circuit is any one of the overvoltage and overcurrent protection circuits.
The invention also provides a method for starting overvoltage and overcurrent, which comprises the following steps:
when the output short circuit is started, a first current limiting circuit is started to limit current;
when the output load is started, the second current limiting circuit is started to limit the current.
Preferably, the output voltage is used as a signal input of the enable signal circuit, and the first enable signal or the second enable signal is output through the enable signal circuit to start the first current limiting circuit or the second current limiting circuit.
Compared with the prior art, when the output voltage is lower, such as output short circuit, the current limiting loop limits the output current by using the starting mode of the first current limiting circuit; when the output voltage is higher than the set value, the current loop circuit uses the starting mode of the second current limiting circuit to obtain an accurate current limiting value. Compared with the traditional overvoltage and overcurrent protection circuit, the high-precision current limiting circuit can meet high-precision current limiting values under different working conditions.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic diagram of an application of an over-voltage and over-current IC;
fig. 2 is a schematic diagram of an over-voltage and over-current protection circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 2, an embodiment of the invention provides an over-voltage and over-current protection circuit, including: an enable signal circuit 300, a first current limiting circuit 100 connected to a first signal output terminal of the enable signal circuit 300, and a second current limiting circuit 200 connected to a second signal output terminal of the enable signal circuit 300; the enable signal circuit 300 is used for switching the start of the first current limiting circuit 100 and the second current limiting circuit 200, when the output is short-circuited, the first current limiting circuit 100 is started, and when the output is on-load, the second current limiting circuit 200 is started.
In this embodiment, the first current limiting circuit 100 is a clamp circuit provided with a sampling tube and a clamp power tube. Specifically, the first current limiting circuit 100 includes: the sampling circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first amplifier A1, a second amplifier A2, a first sampling tube M0_ SNS1, a second sampling tube M0_ SNS2, a power tube M0, a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3, a fourth MOS tube Q4 and a fifth MOS tube Q5.
The positive input end of the first amplifier a1 is connected to a first reference voltage Vref1, and the output end of the first amplifier a1 is connected to the gate of the fourth MOS transistor Q4.
The drain of the fourth MOS transistor Q4 is connected to the source of the fifth MOS transistor Q5, the gate of the fifth MOS transistor Q5 is connected to the first signal output terminal of the enable signal circuit 300, and the source of the fourth MOS transistor Q4 is connected to a current limiting resistor RIlIM And is arranged to be grounded.
The drain electrode of a fifth MOS tube Q5 is connected with the drain electrode of the second MOS tube Q2 and is connected with the second resistor R2 in series, and the source electrode of the second MOS tube Q2 is connected with the negative input end of the second amplifier A2;
the gates of the first MOS transistor Q1, the second MOS transistor Q2 and the third MOS transistor Q3 are connected to each other, the source of the third MOS transistor Q3 is connected to the positive input terminal of the second amplifier a2, the source of the first MOS transistor Q1 is grounded, and the drains of the first MOS transistor Q1, the second MOS transistor Q2 and the third MOS transistor Q3 are respectively connected in series with the first resistor R1, the second resistor R2 and the third resistor R3 and connected to the drain of the power transistor M0.
The output end of the second amplifier a2 is connected to the gate of the power tube, the drains of the first sampling tube M0_ SNS1 and the second sampling tube M0_ SNS2 are respectively connected in series to the third resistor R1 and the first resistor R3, the sources of the first sampling tube M0_ SNS1 and the second sampling tube M0_ SNS2 are connected to the source of the power tube M0, the gates of the first sampling tube M0_ SNS1 and the second sampling tube M0_ SNS2 are connected to each other and to the gate of the power tube M0, the source of the power tube M0 is connected to a load resistor Rload and arranged to ground, and the load resistor Rload is also connected in parallel to an output capacitor Cout.
In the first current limiting circuit, a first amplifier A1 is used to obtain a current signal and an external resistor RILIMCorrelated current Vref1/RILIMThis current is compared to the output current sampled by the first sampling tube M0_ SNS 1. When the sampling current is less than Vref1/RILIMWhen the current is not detected, the second amplifier A2 in the constant current loop does not work, and the output current is determined by the load end; when the sampling current is larger than Vref1/RILIMAt this time, the second amplifier a2 of the constant current loop operates. Assuming that the sampling tube and the power tube work in the same state and neglecting the influence of the first resistor R1, the second resistor R2 and the third resistor R3, the sampling current will be clamped to Vref1/RILIMSo as to obtain a current limiting value K × Vref1/RILIM。
However, the accuracy of the current limit value of the first current limit circuit 100 cannot be guaranteed because of the following reasons: 1. the offset of the threshold voltages of the power tube M0 and the sampling tubes M0_ SNS1 and M0_ SNS 2; 2. when the circuit loop 0V is started, when the power tube M0 and the sampling tubes M0_ SNS1 and M0_ SNS2 work in a saturation region, because Vds of the power tube M0 and the sampling tubes M0_ SNS1 and M0_ SNS2 are different, an error exists between sampling current and a theoretical value; 3. when the VOUT voltage rises to a certain value, the power tube is in a saturation region, and the sampling tube is in a linear region due to the existence of the first resistor R1, the second resistor R2 and the third resistor R3.
Therefore, in this embodiment, the first current limiting circuit 100 is activated when the output short circuit is activated.
In this embodiment, the second current limiting circuit is provided with a clamp circuit that clamps the power transistor and a sampling transistor. Specifically, the second current limiting circuit 200 includes: the circuit comprises a logic control unit 201, a third sampling tube M0_ SNS, a third amplifier A3, a fourth amplifier A4, a sixth MOS tube Q6, a seventh MOS tube Q7 and a power tube M0 shared by the first current limiting circuit 100.
A positive input end of the logic control unit 201 is connected to a second reference voltage Vref2, an output end of the logic control unit 201 is connected to a gate of the third sampling tube M0_ SNS, a drain of the third sampling tube M0_ SNS is connected to a drain of the power tube M0, and a source of the third sampling tube M0_ SNS is connected to a drain of the sixth MOS transistor Q6.
A source of the sixth MOS transistor Q6 is connected to the drain of the seventh MOS transistor Q7, a gate of the seventh MOS transistor Q7 is connected to the second signal output terminal of the enable signal circuit 300, and a source of the seventh MOS transistor Q7 is connected to the negative input terminal of the third amplifier A3, the positive input terminal of the logic control unit 201, and the negative input terminal of the first amplifier a 1.
A positive input terminal of the fourth amplifier a4 is connected to the source of the power transistor M0, a negative input terminal of the fourth amplifier a4 is connected to the source of the third sampling transistor M0_ SNS, and an output terminal of the fourth amplifier a4 is connected to the gate of the sixth MOS transistor Q6.
In this embodiment, the logic control unit 201 includes: the second comparator is an overcurrent comparator, and the logic driving circuit is used for controlling the on and off of the power tube M0 and is also a gate driving circuit of the power tube M0.
In this embodiment, the enable signal circuit 300 includes: the positive input end of the first comparator is connected with a third reference voltage Vref3, and the negative input end of the first comparator is connected with the source output voltage VOUT of the power tube M0.
In this embodiment, the first current limiting circuit 100, the power transistor M0, the output capacitor Cout, and the load resistor Rload form a current limiting circuit for starting an output short circuit; the second current limiting circuit 200, the power tube M0, the output capacitor Cout and the load resistor Rload form a high-precision constant current loop and an overcurrent protection circuit; VOUT and reference voltage Vref3 are compared by a first comparator (VOUT Comp) and output EN,
A signal. EN and
respectively as enable signals of the first current limiting circuit 100 and the second current limiting circuit 200 for controlling the first current limiting circuitSwitching of the circuit 100 and the second current limiting circuit 200. When EN is high, the first current limiting circuit 100 operates;
at the high level, the second current limiting circuit 200 is operated. It should be noted that: the value of the third reference voltage Vref3 needs to be greater than the first reference voltage Vref1, so that the second current limiting circuit 200 can operate.
When the output short circuit is started, the output EN of the first comparator (VOUT Comp) is at high level,
is low. At this time, the first current limiting circuit 100 is started, the second current limiting circuit 200 is always in the off state, and current is limited by the first current limiting circuit 100, the power transistor, the output capacitor Cout, and the load resistor Rload.
When the output load starts, the output voltage VOUT slowly rises. The first comparator (VOUT Comp) output signal EN is initially high,
at a low level, the first current limiting circuit 100 starts to operate, the second current limiting circuit 200 is turned off, and VIN charges the output capacitor Cout through the power tube M0; when Vout rises to be greater than the third reference voltage Vref3, the first comparator (Vout Comp) outputs a signal
At high, the second current limiting circuit 200 is enabled. In order to smoothly switch the loop from the first current limiting circuit 100 to the second current limiting circuit, it is necessary to secure the fourth reference voltage Vref4>The first reference voltage Vref1, and the first current limiting circuit 100 needs to be turned off after the second current limiting circuit 200 is activated for a certain time.
After the output is high level for a certain time, EN outputs low level. The current limiting loop is then controlled by the second current limiting circuit 200.
Based on the above embodiment, a front-end circuit for a lithium battery charger is also provided, which includes the above overvoltage and overcurrent protection circuit.
Example two
The embodiment provides a method for starting overvoltage and overcurrent, which comprises the following steps:
when the output short circuit is started, a first current limiting circuit is started to limit current;
when the output load is started, the second current limiting circuit is started to limit the current.
The first current limiting circuit described in this embodiment may be the first current limiting circuit provided in the first embodiment, or may be another current limiting circuit capable of achieving a high-precision current limiting value when the output short circuit starts. The second current limiting circuit described in this embodiment may be the second current limiting circuit provided in the first embodiment, or may be another current limiting circuit capable of achieving a high-precision current limiting value when the output load is started.
In this embodiment, the output voltage is used as a signal input of the enable signal circuit, and the enable signal circuit outputs a first enable signal or a second enable signal to activate the first current limiting circuit or activate the second current limiting circuit. Specifically, reference may be made to the enable signal circuit provided in the first embodiment.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (10)
1. An over-voltage and over-current protection circuit, comprising: the circuit comprises an enabling signal circuit, a first current limiting circuit connected with a first signal output end of the enabling signal circuit, and a second current limiting circuit connected with a second signal output end of the enabling signal circuit;
the enabling signal circuit is used for switching the start of the first current limiting circuit and the second current limiting circuit, the first current limiting circuit is started when the output short circuit is started, and the second current limiting circuit is started when the output load is started.
2. The over-voltage and over-current protection circuit according to claim 1, wherein the first current limiting circuit is a clamp circuit provided with a sampling tube and a clamp power tube.
3. The over-voltage and over-current protection circuit according to claim 2, wherein the first current limiting circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first amplifier, a second amplifier, a first sampling tube, a second sampling tube, a power tube, a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube and a fifth MOS tube;
the positive input end of the first amplifier is connected with a first reference voltage, and the output end of the first amplifier is connected with the grid electrode of the fourth MOS tube;
the drain electrode of the fourth MOS tube is connected with the source electrode of the fifth MOS tube, the grid electrode of the fifth MOS tube is connected with the first signal output end of the enabling signal circuit, and the source electrode of the fourth MOS tube is grounded;
the drain electrode of the fifth MOS tube is connected with the drain electrode of the second MOS tube and is connected to the second resistor in series, and the source electrode of the second MOS tube is connected to the negative input end of the second amplifier;
the gates of the first MOS tube, the second MOS tube and the third MOS tube are connected with each other, the source electrode of the third MOS tube is connected to the positive input end of the second amplifier, the source electrode of the first MOS tube is grounded, and the drain electrodes of the first MOS tube, the second MOS tube and the third MOS tube are respectively connected in series with a first resistor, a second resistor and a third resistor and connected to the drain electrode of the power tube;
the output end of the second amplifier is connected to the grid electrode of the power tube, the drain electrodes of the first sampling tube and the second sampling tube are respectively connected with the third resistor and the first resistor in series, the source electrodes of the first sampling tube and the second sampling tube are connected with the source electrode of the power tube, the grid electrodes of the first sampling tube and the second sampling tube are connected with each other and connected to the grid electrode of the power tube, and the source electrode of the power tube is connected to the load resistor and is grounded.
4. The over-voltage and over-current protection circuit according to claim 3, wherein the second current limiting circuit is provided with a sampling tube and a clamping circuit for clamping a power tube.
5. The over-voltage and over-current protection circuit according to claim 4, wherein the second current limiting circuit comprises:
the logic control unit, a third sampling tube, a third amplifier, a fourth amplifier, a sixth MOS tube, a seventh MOS tube and a power tube shared by the first current limiting circuit;
the positive input end of the logic control unit is connected with a second reference voltage, the output end of the logic control unit is connected with the grid electrode of the third sampling tube, the drain electrode of the third sampling tube is connected with the drain electrode of the power tube, and the source electrode of the third sampling tube is connected with the drain electrode of the sixth MOS tube;
the source electrode of the sixth MOS tube is connected with the drain electrode of the seventh MOS tube, the grid electrode of the seventh MOS tube is connected with the second signal output end of the enabling signal circuit, and the source electrode of the seventh MOS tube is connected with the negative input end of the third amplifier, the positive input end of the logic control unit and the negative input end of the first amplifier;
the positive input end of the fourth amplifier is connected to the source electrode of the power tube, the negative input end of the fourth amplifier is connected to the source electrode of the third sampling tube, and the output end of the fourth amplifier is connected to the gate electrode of the sixth MOS tube.
6. The over-voltage and over-current protection circuit according to claim 5, wherein the logic control unit comprises: a second comparator and a logic drive circuit.
7. The over-voltage and over-current protection circuit according to claim 3, wherein the enable signal circuit comprises: the positive input end of the first comparator is connected with a third reference voltage, and the negative input end of the first comparator is connected with the source electrode of the power tube.
8. A front-end circuit for a lithium battery charger, comprising an overvoltage overcurrent protection circuit, characterized in that the overvoltage overcurrent protection circuit is an overvoltage overcurrent protection circuit according to any one of claims 1 to 7.
9. A method for starting over voltage and over current is characterized by comprising the following steps:
when the output short circuit is started, a first current limiting circuit is started to limit current;
when the output load is started, the second current limiting circuit is started to limit the current.
10. The method of claim 9, wherein the output voltage is used as a signal input of an enable signal circuit, and a first enable signal or a second enable signal is output through the enable signal circuit to enable the first current limiting circuit or the second current limiting circuit.
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| CN110244095A (en) * | 2019-07-19 | 2019-09-17 | 电子科技大学 | A kind of high speed current sampling circuit of super low-power consumption |
| CN112271764A (en) * | 2020-09-24 | 2021-01-26 | 深圳市思远半导体有限公司 | Overcurrent detection circuit and battery protection device |
| CN112104220A (en) * | 2020-10-30 | 2020-12-18 | 上海芯龙半导体技术股份有限公司南京分公司 | Protection signal generating circuit, power supply circuit and power supply chip |
| WO2021254527A1 (en) * | 2021-01-15 | 2021-12-23 | 上海芯龙半导体技术股份有限公司 | Current-limiting control circuit, and switch power supply chip provided with same |
| CN113270999A (en) * | 2021-07-19 | 2021-08-17 | 上海芯龙半导体技术股份有限公司南京分公司 | Current-limiting configuration chip and switching power supply system |
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| CN114204534B (en) | 2022-06-10 |
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