CN108599570A - A kind of circuit with dynamic regulation current limit threshold - Google Patents
A kind of circuit with dynamic regulation current limit threshold Download PDFInfo
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- CN108599570A CN108599570A CN201810564860.6A CN201810564860A CN108599570A CN 108599570 A CN108599570 A CN 108599570A CN 201810564860 A CN201810564860 A CN 201810564860A CN 108599570 A CN108599570 A CN 108599570A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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Abstract
The invention discloses a kind of circuit with dynamic regulation current limit threshold, the circuit includes：Adaptive throttling circuit, adaptive throttling circuit is connect with driving circuit, variation of the adaptive throttling circuit for constantly monitoring inductive current, when detecting the anomalous variation of electric current, by properly increasing the threshold value of current-limiting circuit to which system be adjusted in advance, inductive current is avoided the situation of negative value occur；The Basic Topological of driving circuit, driving circuit and buck connect, and driving circuit is used to PWM and CLK signal being processed into drive signal TG and BG；The Basic Topological of buck is matched and driving circuit, is used for input voltage VinIt is reduced to required voltage；Real-time monitoring by current detection circuit, differential circuit, comparison circuit to inductive current, the anomalous variation of inductive current is detected in advance and selects suitable current limit threshold, to prevent inductive current occur first will be negative value the case where, the overall performance of lifting system.
Description
Technical field
The present invention relates to field of power management, and in particular, to a kind of circuit with dynamic regulation current limit threshold.
Background technology
Switch power supply system generally comprises some protection circuits, such as:Temperature protection circuit, voltage protection circuit, circuit
Protect circuit.When electric switch power-supply system is abnormal, protect circuit can protection power source system be not damaged.When switch electricity
When source system is abnormal or is in special pattern, inductive current will appear the case where being reduced rapidly.Due to current detecting ring
There are certain delays on road, therefore inductive current is possible to that negative value can be reduced to, this is typically undesirable.
Invention content
To solve the above-mentioned problems, present applicant proposes a kind of circuit with dynamic regulation current limit threshold, pass through electric current
The real-time monitoring of detection circuit, differential circuit, comparison circuit to inductive current, detects the anomalous variation of inductive current simultaneously in advance
Select suitable current limit threshold, to prevent inductive current occur first will be negative value the case where, the overall performance of lifting system.
For achieving the above object, this application provides a kind of circuit with dynamic regulation current limit threshold, features
It is, the circuit includes：
Adaptive throttling circuit, adaptive throttling circuit are connect with driving circuit, and adaptive throttling circuit is for constantly supervising
The variation for surveying inductive current, when detecting the anomalous variation of electric current, by properly increasing to put forward the threshold value of current-limiting circuit
It is preceding that system is adjusted, avoid inductive current from the situation of negative value occur；
The Basic Topological of driving circuit, driving circuit and buck connect, and driving circuit is used for PWM and CLK signal
It is processed into drive signal TG and BG；
The Basic Topological of buck is matched and driving circuit, is used for input voltage VinIt is reduced to required voltage.
Wherein, the emphasis of the application is adaptive throttling circuit, and the topological structure of driving circuit and buck are the prior art
In circuit and structure, the purpose of topological structure of driving circuit and buck be that adaptive circuit forms a cyclic system, be convenient for
The purposes of adaptive throttling circuit is described and explained, current-limiting circuit is not limited to buck, can be used in various power-supply systems such as：
Buck, boost, buck-boost etc..
Further, adaptive throttling circuit includes：Current detection circuit, differential circuit, comparison circuit, current-limiting circuit；
Further, the driving circuit and buck topological structures include：Current sense resistor Rsense, inductance L, capacitance C,
Field-effect tube NM1, field-effect tube NM2, resistance Rload；Field-effect tube NM1The poles G and field-effect tube NM2G extremely and driving circuit
Output end connection, field-effect tube NM1The poles D connect with the ends Vin, field-effect tube NM1The poles S and field-effect tube NM2D it is extremely equal
It is connect with one end of inductance L, the other end and the resistance R of inductance LsenseOne end connection, resistance RsenseThe other end and capacitance C
Anode and resistance RloadOne end be all connected with, field-effect tube NM2The poles S, capacitance C cathode, resistance RloadThe other end connect
Ground.
Further, the differential circuit includes：Triode Q1-Q4, field-effect tube NM3-NM8, capacitance C4, resistance R3, fortune
Put Amp, resistance R1, resistance R2；
Resistance R1One end connect with current detection circuit positive input terminal, resistance R1The other end and IbiasEnd, triode Q1
Emitter, triode Q3Emitter be all connected with, triode Q1Collector and field-effect tube NM3The poles D, field-effect tube NM4
The poles G be all connected with, triode Q1Base stage and triode Q3Base stage, triode Q3Collector be all connected with, triode Q3Collection
Electrode, triode Q2Collector and 2IbiasEnd connection, field-effect tube NM3The poles G, field-effect tube NM5G extremely and Vbias2
End connection, field-effect tube NM3The poles S and field-effect tube NM4The poles D connection, field-effect tube NM4The poles G and field-effect tube NM6G
Pole connects, field-effect tube NM4The poles S ground connection；Resistance R2The connection of one end current detection circuit negative input end, resistance R2It is another
End and triode Q2Emitter, triode Q4Emitter, field-effect tube NM8The poles D be all connected with, triode Q2Base stage, three
Pole pipe Q4Base stage with triode Q2Collector be all connected with, triode Q4Collector and field-effect tube NM5The poles D, field effect
It should pipe NM7The poles G, capacitance C4Anode be all connected with, field-effect tube NM8The poles G and Vbias1End connection, field-effect tube NM8The poles S
With field-effect tube NM7The poles D connection, field-effect tube NM7The poles S ground connection, capacitance C4Cathode and resistance R3One end, amplifier Amp
Negative input end be all connected with, the positive input terminal and V of amplifier Ampbias3End connection, resistance R3The other end, amplifier Amp output end
And VbEnd connection.
Further, the comparison circuit includes resistance R<n:0>, comparator Comp<n-1:0>, phase inverter INV<n-1:0>, with door
AND<n-1:0>；Resistance R<n:0>It is serially connected in reference voltage VrefBetween GND；Comparator Comp<n-1:0>Negative input end be separately connected
In R<n-1:0>Upper end, positive input terminal is uniformly connected to the output voltage V of differential circuitb, Comp<n-1:1>Enable Pin connect respectively
Meet Comp<n-2:0>Output end；The output end V of comparatorout<0>It is connected to the AND with door<0>An input terminal, Vout<n-2:1>Point
AND is not connected to it<n-2:1>An input terminal and be connected respectively to INV<n-1:0>Input terminal, INV<n-1:0>Output end be separately connected
To AND<n-1:0>An input terminal.
Further, the current-limiting circuit includes Cmop, n capacitance C of a comparator and n field-effect tube；Comparator
Comp positive input terminals connect current detection circuit output voltage Vsense, negative input end connection field-effect tube NM<n-1:0>Drain electrode, field
Effect tube grid is separately connected the output control signal Ctr of comparison circuit<n-1:0>, source electrode is connected respectively to capacitance C<n-1:0>It is upper
End and Vref<n-1:0>；Capacitance lower end is uniformly connected to GND.
The invention discloses a kind of circuits with dynamic regulation current limit threshold, including adaptive throttling circuit：Electric current is examined
Survey ＆ differential circuits, comparison circuit ＆ current-limiting circuits, the Basic Topological of driving circuit and buck, including power tube NM1、NM2,
Inductance L, capacitance C and load resistance Rload；The output end V of the current detecting ＆ differential circuit modulesbIt is connected to comparison circuit ＆ limits
The input terminal of current circuit module, comparison circuit ＆ current-limiting circuit modules export a LIP current limit signal and control driving circuit.When being
When system is abnormal or enters special pattern, inductive current may strongly reduce, since current feedback loop exists centainly
Delay be likely to inductive current occur the case where negative value occur.It is typically that inductive current is not intended to occur in the power supply system
Negative value is unfavorable for the utilization ratio of power-supply system.Electricity can be detected in advance by current detecting ＆ differential circuits and comparison circuit
The anomalous variation of stream, by the way that appropriate improve so that system be adjusted in advance of the threshold value of current-limiting circuit is avoided inductive current
There is the situation of negative value.Some performance indicators of system can be improved by using the circuit of dynamic regulation current limit threshold, such as
System restores normal respond from abnormality.
One or more technical solution provided by the present application, has at least the following technical effects or advantages：
When power-supply system is abnormal or when special pattern, inductive current may strongly reduce, micro- by current detecting ＆
The anomalous variation of electric current is converted to voltage signal V by parallel circuitb, then by comparing circuit by voltage signal VbIt is quantified as n controls
Signal Ctr processed<n-1:0>, the threshold value selection of these responsible current-limiting circuits of control letter.Electricity can be detected in advance by the above circuit
The anomalous variation of stream carries out dynamic regulation by the threshold value to current-limiting circuit, to avoid inductive current from the case where negative value occur,
The overall performance of lifting system.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention；
Fig. 1 is the whole topological diagram of the present invention；
Fig. 2 is the physical circuit figure that circuit of the present invention detects ＆ differential circuits；
Fig. 3 is a physical circuit figure of comparison circuit；
Fig. 4 is a physical circuit figure of current-limiting circuit；
Inductive current change schematic diagram when Fig. 5 is abnormal for switch power supply system；
Fig. 6 is that circuit detects ＆ differential circuit output signal schematic diagrames；
Fig. 7 is comparison circuit output control signal schematic representation；
Fig. 8 current-limiting circuit threshold voltage variation schematic diagrames.
Specific implementation mode
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
Implemented with being different from the other modes being described herein in range using other, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
The present invention provides a kind of circuits with dynamic regulation current limit threshold, including adaptive throttling circuit 20：Electric current
Detect ＆ differential circuits, comparison circuit ＆ current-limiting circuits, the Basic Topological 10 of driving circuit 30 and buck, including power tube
NM1、NM2, inductance L, capacitance C and load resistance Rload；The output end V of the current detecting ＆ differential circuit modulesbIt is connected to ratio
Compared with the input terminal of circuit ＆ current-limiting circuit modules, comparison circuit ＆ current-limiting circuit modules export a LIP current limit signals control driving
Circuit.When system is abnormal or enters special pattern, inductive current may strongly reduce, micro- by current detecting ＆
The anomalous variation of electric current is converted to voltage signal V by parallel circuitb, then by comparing circuit by voltage signal VbIt is quantified as n controls
Signal Ctr processed<n-1:0>, these control the threshold value selection that signals are responsible for current-limiting circuit.It can be detected in advance by the above circuit
The anomalous variation of electric current carries out dynamic regulation by the threshold value to current-limiting circuit, to avoid inductive current from the feelings of negative value occur
Condition.
Embodiment 1
A kind of adaptive throttling circuit as shown in Figure 1, including adaptive throttling circuit 20：Current detecting ＆ differential circuits,
The Basic Topological 30 of comparison circuit ＆ current-limiting circuits, driving circuit 30 and buck Switching Power Supplies, including power tube NM1、NM2,
Inductance L, capacitance C and load resistance Rload；The input terminal V of the current detecting ＆ differential circuit modulesbIt is connected to inspection leakage resistance
RsenseOn, output end is connected to the input terminal of comparison circuit ＆ current-limiting circuit modules；The output signal of the comparison circuit
Ctr<n-1:0>It is connected respectively to the threshold value control switch NM of current-limiting circuit module<n-1:0>On；The output end LIP of the current limliting module
It is connected to driving circuit.
Embodiment 2
Principle based on above-described embodiment, the present embodiment are described in detail by taking n=2 as an example.
As shown in Fig. 2, current detecting ＆ differential circuits include triode Q<4:1>；Field-effect tube NM<12:3>Resistance R<3:1>Capacitance
C4It is constituted with amplifier Amp, voltage and current biasing is as shown in Figure 2.Current detecting ＆ differential circuits become the exception of inductive current
Change is first converted to voltage Vsense, inductive current anomalous variation amount is then converted to by output voltage V by differential circuitb.Pass through
Comparison circuit is by voltage VbIt is quantified as three control signal Ctr<2:0>, control signal is by controlling opening for current-limiting circuit threshold voltage
It closes to realize the adjusting of dynamic threshold voltage.
The Basic Topological of the circuit of dynamic regulation current limit threshold of the present invention also Packet driven circuit module and buck.
Preferably, comparison circuit is by the output signal V of current detecting ＆ derivative modulesbProcessing is 3 control signals
Ctr<2:0>, control signal and control current-limiting circuit threshold voltage switch NM respectively<2:0>, to realize the function of adaptive throttling.
Now the operation logic of foregoing circuit is described in detail.
When system encounters exception or special pattern, in order to protect system normal operation, current-limiting circuit that can pass through control
Module is by power tube NM1Shutdown, NM2It opens.This operation is the charge of the electric current and capacitance (C) storage in order to store inductance (L)
Discharge the abnormality with deactivation system.At this moment the electric current on inductance is it is possible that the situation being reduced rapidly, leads to inductance
Electric current there is the case where negative value in a short time as shown in figure 4, due to reverse current protection circuit effect, inductive current can't one
Straight to reduce, when abnormality releases, inductive current is just again restored to normal condition.If inductive current when system worked well
For Iout, when inductive current is abnormal, the variation of inductive current is Δ Iout.The input voltage V of current detection circuitsenseFor
Detection resistance RsenseWith output current change Iout+ΔIoutProduct
Vsense=(Iout+ΔIout)*Rsen (1)
The gain of current detection circuit in current feedback loop is Av, output voltage Vo。
G in formulamFor NM11Mutual conductance.
The output voltage V of differential circuitoIt is related to the change rate of the output voltage of current detection circuit.Differential circuit it is defeated
Go out voltage and following formula description may be used：
When in view of system worked well, inductive current also have by a small margin have cyclically-varying.At this point, differential circuit
Output voltage VbIt is approximately equal to Vbias3.It is needed in the comparator threshold of design comparison circuit caused by the minor swing by inductive current
The variation of differential circuit output voltage count, by first comparator comp<0>Threshold value setting be slightly larger than Vbias3, it is
The output control signal Ctr of comparison circuit when system normal work<0>In effective status, minimum current limit threshold is chosen.Then root
According to the situation setting comparator comp of system application<2:1>Threshold value.
In order to reduce the power consumption of comparison circuit, only Comp when the systems are operating normally<1:0>In normal operating conditions,
Remaining comparator is then in close pattern.As comparator Comp<1>When output is high, then by comparator Comp<2>If this standby shape
State.
When inductive current is reduced rapidly, differential circuit is able to detect that the speed of the output voltage variation of current detection circuit
Degree, if the speed that inductive current reduces is more than comparator comp<1>Threshold voltage corresponding to electric current reduce speed when, compare
Circuit will make control signal Ctr<1>Effectively.It is higher by the threshold value control switch selection for controlling current-limiting circuit to control signal
Threshold value, avoid in this case inductive current fall to negative value.
When the speed that inductive current reduces faster when, it is possible to can trigger comparator comp<2>Make the control of comparison circuit
Signal Ctr<2>Effectively, make the threshold voltage of current-limiting circuit that higher value be selected to prevent inductive current from falling to negative value.Current limliting electricity
The threshold voltage variation schematic diagram such as Fig. 7 on road.
By using a kind of adaptive throttling circuit, can pass through when system exception occurs or enters special pattern
Current detection circuit, differential circuit, comparison circuit are in real time monitored inductive current the progress of inductive current, detect in advance
To inductive current anomalous variation and select suitable current limit threshold, first will be for the feelings of negative value to prevent inductive current from occurring
Condition.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of circuit with dynamic regulation current limit threshold, which is characterized in that the circuit includes：
Adaptive throttling circuit, adaptive throttling circuit are connect with driving circuit, and adaptive throttling circuit is for constantly monitoring electricity
The variation of inducing current, when detecting the anomalous variation of electric current, by properly increasing the threshold value of current-limiting circuit to right in advance
System is adjusted, and inductive current is avoided the situation of negative value occur；
The Basic Topological of driving circuit, driving circuit and buck connect, and driving circuit is used to handle PWM and CLK signal
At drive signal TG and BG；The Basic Topological of buck is matched and driving circuit, is used for input voltage VinRequired for being reduced to
Voltage.
2. the circuit according to claim 1 with dynamic regulation current limit threshold, which is characterized in that adaptive throttling circuit
Including：Current detection circuit, differential circuit, comparison circuit, current-limiting circuit.
3. the circuit according to claim 2 with dynamic regulation current limit threshold, which is characterized in that the driving circuit and
Buck topological structures include：Current sense resistor Rsense, inductance L, capacitance C, field-effect tube NM1, field-effect tube NM2, resistance
Rload；Field-effect tube NM1The poles G and field-effect tube NM2G extremely connect with the output end of driving circuit, field-effect tube NM1D
Pole and VinEnd connection, field-effect tube NM1The poles S and field-effect tube NM2D extremely connect with one end of inductance L, inductance L's is another
One end and resistance RsenseOne end connection, resistance RsenseThe other end and capacitance C anode and resistance RloadOne end be all connected with,
Field-effect tube NM2The poles S, capacitance C cathode, resistance RloadThe other end be grounded.
4. the circuit according to claim 2 with dynamic regulation current limit threshold, which is characterized in that the differential circuit packet
It includes：Triode Q1-Q4, field-effect tube NM3-NM8, capacitance C4, resistance R3, amplifier Amp, resistance R1, resistance R2；
Resistance R1One end connect with current detection circuit positive input terminal, resistance R1The other end and IbiasEnd, triode Q1Hair
Emitter-base bandgap grading, triode Q3Emitter be all connected with, triode Q1Collector and field-effect tube NM3The poles D, field-effect tube NM4G
Pole is all connected with, triode Q1Base stage and triode Q3Base stage, triode Q3Collector be all connected with, triode Q3Current collection
Pole, triode Q2Collector and 2IbiasEnd connection, field-effect tube NM3The poles G, field-effect tube NM5G extremely and Vbias2End
Connection, field-effect tube NM3The poles S and field-effect tube NM4The poles D connection, field-effect tube NM4The poles G and field-effect tube NM6The poles G
Connection, field-effect tube NM4The poles S ground connection；Resistance R2The connection of one end current detection circuit negative input end, resistance R2The other end
Emitter, triode Q with triode Q24Emitter, field-effect tube NM8The poles D be all connected with, triode Q2Base stage, three poles
The base stage of pipe Q4 with triode Q2Collector be all connected with, triode Q4Collector and field-effect tube NM5The poles D, field-effect
Pipe NM7The poles G, capacitance C4Anode be all connected with, field-effect tube NM8The poles G and Vbias1End connection, field-effect tube NM8The poles S with
Field-effect tube NM7The poles D connection, field-effect tube NM7The poles S ground connection, capacitance C4Cathode and resistance R3One end, amplifier Amp
Negative input end is all connected with, the positive input terminal and V of amplifier Ampbias3End connection, resistance R3The other end, the output end of amplifier Amp it is equal
With VbEnd connection.
5. the circuit according to claim 2 with dynamic regulation current limit threshold, which is characterized in that the comparison circuit packet
Include resistance R<n:0>, comparator Comp<n-1:0>, phase inverter INV<n-1:0>, with door AND<n-1:0>；Resistance R<n:0>It is serially connected in reference voltage
VrefBetween GND；Comparator Comp<n-1:0>Negative input end be connected to R<n-1:0>Upper end, positive input terminal is unified to be connected
To the output voltage V of differential circuitb, Comp<n-1:1>Enable Pin be separately connected Comp<n-2:0>Output end；The output of comparator
Hold Vout<0>It is connected to the AND with door<0>An input terminal, Vout<n-2:1>It is connected respectively to AND<n-2:1>An input terminal and difference
It is connected to INV<n-1:0>Input terminal, INV<n-1:0>Output end be connected respectively to AND<n-1:0>An input terminal.
6. the circuit according to claim 2 with dynamic regulation current limit threshold, which is characterized in that the current-limiting circuit packet
Include Cmop, n capacitance C of a comparator and n field-effect tube；Comparator Comp positive input terminals connect current detection circuit output
Voltage Vsense, negative input end connection field-effect tube NM<n-1:0>Drain electrode, fet gate is separately connected the output of comparison circuit
Control signal Ctr<n-1:0>, source electrode is connected respectively to capacitance C<n-1:0>Upper end and Vref<n-1:0>；Capacitance lower end is uniformly connected to
GND。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810564860.6A CN108599570B (en) | 2018-06-04 | 2018-06-04 | A kind of circuit with dynamic regulation current limit threshold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810564860.6A CN108599570B (en) | 2018-06-04 | 2018-06-04 | A kind of circuit with dynamic regulation current limit threshold |
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| CN108599570A true CN108599570A (en) | 2018-09-28 |
| CN108599570B CN108599570B (en) | 2019-10-22 |
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| CN201810564860.6A Active CN108599570B (en) | 2018-06-04 | 2018-06-04 | A kind of circuit with dynamic regulation current limit threshold |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110912082A (en) * | 2019-12-06 | 2020-03-24 | 苏州浪潮智能科技有限公司 | Buck circuit, circuit protection device and method |
| CN111351973A (en) * | 2018-12-20 | 2020-06-30 | Qorvo美国公司 | Current measuring circuit |
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| CN101295872A (en) * | 2007-04-28 | 2008-10-29 | 昂宝电子（上海）有限公司 | System and method for providing overcurrent and overpower protection for power converter |
| CN107834853A (en) * | 2016-09-16 | 2018-03-23 | 电力集成公司 | The switch mode power converter controller of ramp time modulation is carried out with chattering frequency |
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| CN1549434A (en) * | 2003-05-08 | 2004-11-24 | 尹启凤 | Output current adjustable electric current drive circuit |
| CN101034853A (en) * | 2006-02-28 | 2007-09-12 | 三美电机株式会社 | Switching power supply apparatus |
| CN101056055A (en) * | 2006-04-14 | 2007-10-17 | 圆创科技股份有限公司 | Reverse current prevention circuit capable of self-correcting reference benchmark |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111351973A (en) * | 2018-12-20 | 2020-06-30 | Qorvo美国公司 | Current measuring circuit |
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| Publication number | Publication date |
|---|---|
| CN108599570B (en) | 2019-10-22 |
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