CN103474951B - The controlled low voltage difference current foldback circuit of a kind of output - Google Patents
The controlled low voltage difference current foldback circuit of a kind of output Download PDFInfo
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- CN103474951B CN103474951B CN201310381855.9A CN201310381855A CN103474951B CN 103474951 B CN103474951 B CN 103474951B CN 201310381855 A CN201310381855 A CN 201310381855A CN 103474951 B CN103474951 B CN 103474951B
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Abstract
The controlled low voltage difference current foldback circuit of a kind of output; comprise that primary path, secondary path, reverse voltage protection circuit, major-minor path overcurrent switch and enable to forbid that control circuit, efficiency-adjusted resistance, overcurrent sampling resistor and carrying current setting are electric; this circuit possesses the function of automatic overcurrent protection and output enable/forbid; be serially connected in the power import place of circuit; can realize the locking of satellite borne equipment components and parts anti-single particle and short circuit overcurrent protection function, there is higher practical value. The application demand that well meets spacecraft satellite borne equipment according to the special asic chip of circuit customization of the present invention, is conducive to improve device integration, and this circuit overcurrent protection function also has very strong versatility for the circuit beyond spacecraft simultaneously.
Description
Technical field
The present invention relates to the controlled low voltage difference current foldback circuit of a kind of output, for the circuit overcurrent of electronic equipmentProtection, belongs to electronic circuit design field.
Background technology
In spacecraft electronic equipment design, overcurrent protection is an important reliability, security measures,Be mainly used in power protection, semiconductor devices locking single particle protection design etc. Conventional overcurrent protection at presentBe designed with two kinds: one is to adopt current-limiting resistance to carry out overcurrent protection, the another kind of voltage stabilizing current limiting device that adopts entersRow overcurrent protection, wherein adopts current-limiting resistance to carry out overcurrent protection the most common.
(1) adopt current-limiting resistance to do overcurrent protection, circuit is simple, but can not ensure that circuit design can at every turnEnough reach designing requirement and meet the result of overcurrent protection, stability is not high, adopts current-limiting resistance to do overcurrent and protectsProtect following open defect:
A, resistance are little, and cut-off current does not meet the demands, and does not have protective effect; Resistance is large, and pressure drop increases, deviceThe supply voltage of part does not meet the demands.
B, for the larger situation of supply current, need inside circuit subregion current limliting, both increased printed board designDifficulty, can cause again each component voltage inconsistent.
C, operating current variation cause device mains ripple, affect service behaviour, and general recommendations reduces to supplyResistance in electricity loop, contradicts with current-limiting protection demand.
(2) method that adopts voltage stabilizing current limiting device to carry out overcurrent protection, monitors output current by sample circuit,And produce over-current signal by comparator, then control voltage-stablizer and adjust the output voltage of pipe, thereby reach limitThe object of stream protection. Under overcurrent protection state, particularly, in load short circuits situation, not only there is super-high-currentFlow through from adjusting pipe, and adjust the voltage of managing two ends also in maximum, the power consumption of whole circuit all addsAdjusting on pipe, probably burning out and adjust pipe. Therefore, if there is in-orbit single-particle in satellite or airship equipmentLocking, supposes to cut off in time electricity, keeps for a long time large electric current to pass through, and likely causes fault notCan recover. There is no aerospace grade device owing to being limited by addition, do not meet requirement in service life in-orbit, at presentDomestic spacecraft application is fewer.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of output controlled low pressurePoor current foldback circuit, possesses automatic overcurrent protection and the controlled function of output, and this circuit is serially connected in to space flightThe power import place of device electronic equipment, has solved semiconductor devices single-particle lock in spacecraft electronic equipment designThe problem of fixed protection design and power supply overcurrent protection.
Technical solution of the present invention is:
The controlled low voltage difference current foldback circuit of a kind of output comprises primary path, secondary path, reverse-voltage protection electricityRoad, major-minor path overcurrent switch and enable to forbid control circuit, efficiency-adjusted circuit, overcurrent sample circuit andCarrying current initialization circuit, wherein:
Overcurrent sample circuit is for the electric current of the whole holding circuit of sampling;
Major-minor path overcurrent switches and enables to forbid that control circuit is according to current sampling signal and outside input controlSignal switches major-minor path and enables to forbid to be controlled;
When control signal is during in output enable state, by overcurrent sample circuit, the electric current flowing through is sampledMonitor, in the time that electric current is in current limliting thresholding, major-minor path overcurrent switches and enables to forbid control circuit control masterPath is in normal operating conditions, and by the power supplying efficiency of efficiency-adjusted circuit adjustment primary path to load,Primary path output connects load; When the electric current of sampling exceeds current limliting thresholding, major-minor path overcurrent switches and enablesForbid that control circuit control primary path circuit quits work, control secondary path circuitry simultaneously and normally work, pass throughSecondary path provides power supply for load, and secondary path connects load;
Holding circuit is in the time of over-current state, and carrying current initialization circuit arranges and limited the utmost point that flows through secondary pathThreshold currents;
When control signal is in output illegal state, major-minor path overcurrent switches and enables to forbid control circuit controlPrimary path processed and secondary path, in cut-off state, make whole circuit stop providing power supply for load;
Reverse voltage protection circuit is connected in described major-minor path overcurrent switching and enables to forbid control circuit and instituteState between the output of primary path and described secondary path for preventing from preventing in many power supplys parallel operation situation anti-To recharging of voltage.
Described primary path comprises a positive-negative-positive triode T1A; Described secondary path comprises NPN type triodeT2 and resistance R 4; Described major-minor path overcurrent switches and enables to forbid that control circuit comprises positive-negative-positive triodeT3, NPN type triode T5, NPN type triode T6, NPN type triode T7, NPN type triodeT8, diode D1, diode D3, resistance R 1, resistance R 2, resistance R 5 and resistance R 6; Described anti-Comprise positive-negative-positive triode T4 and resistance R 3 to voltage protection circuit; Described efficiency-adjusted circuit adopts resistanceRs2; Described overcurrent sample circuit adopts resistance R s1; Described carrying current initialization circuit adopts resistance R p;
The base stage of described positive-negative-positive triode T1A is connected to major-minor path overcurrent and switches and enable to forbid to control electricThe colelctor electrode of NPN type triode T5 in road; The colelctor electrode of described positive-negative-positive triode T1A is with secondary logicalPositive-negative-positive triode T4 in emitter stage and the reverse protection circuit of NPN type triode T2 in road sends outEmitter-base bandgap grading is connected; The emitter stage of described positive-negative-positive triode T1A is connected to the switching of major-minor path overcurrent and enables to prohibitThe only base of the NPN type triode T2 in base stage and the secondary path of the positive-negative-positive triode T3 in control circuitOne end of the utmost point and resistance R 4, resistance R s1 and resistance R p;
Positive-negative-positive triode T4's in emitter stage and the reverse protection circuit of described NPN type triode T2Emitter stage is connected; The colelctor electrode of described NPN type triode T2 is connected with the other end of resistance R p; ResistanceThe base stage of the other end of R4 and described NPN type triode T2 and major-minor path overcurrent switch and enable to forbidThe colelctor electrode of NPN type triode T7 in control circuit is connected;
The colelctor electrode of described positive-negative-positive triode T3 is connected with the anode of diode D1, the moon of diode D1The utmost point is connected with the colelctor electrode of positive-negative-positive triode T4 in reverse protection circuit; Described NPN type triode T7Base stage be connected with control end signal by resistance R 5 as the input of enable signal; Described NPN type threeThe base stage of utmost point pipe T8 is connected with control end signal by resistance R 6 as the input of enable signal; DescribedThe base stage of positive-negative-positive triode T3 is connected with one end of Rs1, the anode of described diode D3, described PNPThe emitter of type triode T3 and one end of resistance R 1 are connected with the other end of resistance R s1; ResistanceThe other end of R1 is connected to colelctor electrode and the described NPN type triode T5 of described NPN type triode T8Base stage and the colelctor electrode of described NPN type triode T6;
The colelctor electrode of described positive-negative-positive triode T4 is the base stage with NPN type triode T6 by resistance R 2Be connected; The base stage of described positive-negative-positive triode T4 is by resistance R 3 ground connection.
Described primary path, secondary path, reverse voltage protection circuit, major-minor path overcurrent switch and enable to forbidControl circuit, efficiency-adjusted circuit, overcurrent sample circuit and carrying current initialization circuit concentrate on a chipIn.
Described primary path, secondary path, reverse voltage protection circuit, major-minor path overcurrent switch and enable to forbidControl circuit concentrates in a chip, and efficiency-adjusted circuit, overcurrent sample circuit and carrying current are set electricityThe road external form of sampling.
The present invention's beneficial effect is compared with prior art:
(1) the present invention adopts major and minor path channel structure design, provides respectively circuit at normal work shapeCurrent channel under state and under over-current state. Low voltage difference power demands when main channel can ensure normally to work,Subaisle can ensure Current Limits to fix on the object that reaches protection power supply within safe range.
(2) current foldback circuit that the present invention proposes can be by configuration different sampling resistor, carrying currentCurrent-limiting resistance, efficiency-adjusted resistance, arrange rational current protection interval for concrete applied environment, improvesThe use flexibility of circuit.
(3) current foldback circuit that the present invention proposes automatically cut off primary path while possessing overcurrent with protection power source andDriving tube, after overcurrent, output voltage reduces and can in the time there is space locking single particle, make components and parts exit lockingState, after over-current phenomenon avoidance disappears, circuit can recover the function of normal power supply automatically, possesses wider simultaneouslySupply voltage accommodation, versatility is stronger. The present invention simultaneously adopts FEEDBACK CONTROL, makes the each crystalline substance of inside circuitBody pipe all can keep saturated or cut-off state under normal work and overcurrent protection state, ensures that each pipe power consumption existsLower level, has avoided device to burn out because of overheated, improves circuit reliability.
(4) the present invention possesses anti-reverse voltage function, supports many power supplys parallel operation, solution power supply cold standby,Equipment often powers up design powerup issue, and power input adopts this circuit can effectively control the large of surge currentLittle.
(5) when circuit of the present invention is realized the design of customization asic chip, by sampling resistor, carrying current current limlitingResistance, efficiency-adjusted resistance are external, can improve the scope of application of chip.
Brief description of the drawings
Fig. 1 is circuit function module schematic diagram of the present invention;
Fig. 2 is physical circuit schematic diagram of the present invention;
Fig. 3 is the DC parameter analogous diagram of circuit of the present invention under output normal condition;
Fig. 4 is the DC parameter analogous diagram of circuit of the present invention under output overcurrent guard mode;
Fig. 5 is the DC parameter analogous diagram of circuit of the present invention under control end output illegal state;
Fig. 6 is the DC parameter analogous diagram of circuit of the present invention under reverse protection state.
Detailed description of the invention
Further illustrate the specific embodiment of the invention below in conjunction with accompanying drawing.
As shown in Figure 1, the controlled low voltage difference current foldback circuit of a kind of output of the present invention, comprises primary path, pairPath, reverse voltage protection circuit, major-minor path overcurrent switch and enable to forbid control circuit, efficiency-adjustedCircuit, overcurrent sample circuit and carrying current initialization circuit.
Overcurrent sample circuit is for the electric current of the whole holding circuit of sampling; Major-minor path overcurrent switches and enables to be prohibitedOnly the input of control circuit is connected with external control signal; Major-minor path overcurrent switches and enables to forbid to be controlledCircuit enables or forbids the electricity of control signal according to the overcurrent id signal being obtained by current sample and outside inputPressure condition switches major-minor path and enables to forbid to be controlled.
Primary path and efficiency-adjusted circuit, overcurrent sample circuit and carrying current initialization circuit and major-minor path mistakeStream switches and enables to forbid that control circuit is connected. Secondary path respectively with carrying current initialization circuit and major-minor pathOvercurrent switches and enables to forbid that control circuit is connected. When control signal (is controlled during in output enable stateWhen signal is low level), overcurrent sample circuit is to the electric current the flowing through supervision of sampling, if electric current is in current limlitingIn thresholding, major-minor path overcurrent switches and enables to forbid that control circuit control primary path is in normal operating conditions,And by the power supplying efficiency of efficiency-adjusted circuit adjustment primary path to load, primary path output connects load; WhenWhen load short circuits, the electric current being sampled exceeds current limliting thresholding, and major-minor path overcurrent switches and enables to forbid to be controlledCircuit control primary path circuit quits work, and controls secondary path circuitry simultaneously and normally works, and by secondary path isLoad provides power supply, and secondary path connects load.
When control signal is in the time exporting illegal state (when control signal is high level), major-minor path overcurrentSwitch and enable to forbid that control circuit control primary path and secondary path stop whole circuit in cut-off stateFor load provides power supply;
Holding circuit is in the time of over-current state, and carrying current initialization circuit arranges and limited the utmost point that flows through secondary pathThreshold currents.
Reverse voltage protection circuit is connected in described major-minor path overcurrent switching and enables to forbid control circuit and instituteState between the output of primary path and described secondary path for preventing from preventing in many power supplys parallel operation situation anti-To recharging of voltage.
The two ends of efficiency-adjusted circuit are connected to primary path circuit and the switching of major-minor path overcurrent and enable to prohibitOnly control circuit, for according to the loss current size of the real work Current Control chip of circuit, ensures electricityRoad power supplying efficiency.
One end and major-minor path overcurrent that carrying current initialization circuit is connected in overcurrent sample circuit switch and enableForbid control circuit, the other end is connected in secondary path for setting the overload current maximum in load short circuits situationValue, when holding circuit is during in over-current state, carrying current initialization circuit arranges to have limited and flows through secondary pathCarrying current; The other end of overcurrent sample circuit is connected to the switching of major-minor path overcurrent simultaneously and enables to forbid controlCircuit processed.
Below with instantiation explanation circuit structure of the present invention and an operation principle:
As shown in Figure 1, 2, efficiency-adjusted circuit adopts resistance R s2 to realize; Described overcurrent sample circuit adoptsResistance R s1 realizes; Described carrying current initialization circuit adopts resistance R p to realize; Primary path is selected positive-negative-positiveTriode T1A, the base stage of positive-negative-positive triode T1A is connected to major-minor path overcurrent and switches and enable to forbidThe colelctor electrode of NPN type triode T5 in control circuit; The colelctor electrode of positive-negative-positive triode T1A is with secondaryPositive-negative-positive triode T4's in emitter stage and the reverse protection circuit of NPN type triode T2 in pathEmitter stage is connected; The emitter stage of positive-negative-positive triode T1A is connected to the switching of major-minor path overcurrent and enables to prohibitOnly resistance R 4, the overcurrent sampling resistor in base stage and the secondary path of the positive-negative-positive triode T3 in control circuitOne end of Rs1 and resistance R p.
Secondary path comprises NPN type triode T2 and resistance R 4; The emitter stage of NPN type triode T2 withThe emitter stage of positive-negative-positive triode T4 in reverse protection circuit is connected; The current collection of NPN type triode T2The utmost point is connected with the other end of resistance R p; The base stage of the other end of resistance R 4 and NPN type triode T2 andMajor-minor path overcurrent switches and enables to forbid that the colelctor electrode of the NPN type triode T7 in control circuit is connected.
Major-minor path overcurrent switches and enables to forbid that control circuit comprises positive-negative-positive triode T3, NPN type threeUtmost point pipe T5, NPN type triode T6, NPN type triode T7, NPN type triode T8, diodeD1, diode D3, resistance R 1, resistance R 2, resistance R 5 and resistance R 6; Positive-negative-positive triode T3Colelctor electrode be connected with the anode of diode D1; The base stage of NPN type triode T7 is as enable signalInput is connected with control end signal by resistance R 5; The base stage of NPN type triode T8 is as enabling letterNumber input be connected with control end signal by resistance R 6; The other end of resistance R s1 is connected in described twoAnode, the emitter of positive-negative-positive triode T3 and one end of resistance R 1 of utmost point pipe D3 is connected, resistanceThe other end of R1 be connected to the colelctor electrode of NPN type triode T8 and the base stage of NPN type triode T5 withAnd the colelctor electrode of described NPN type triode T6.
Reverse voltage protection circuit comprises positive-negative-positive triode T4 and resistance R 3; Positive-negative-positive triode T4Base stage be connected with the negative electrode of diode D3; The colelctor electrode of positive-negative-positive triode T4 and diode D1'sNegative electrode is connected, and the colelctor electrode of positive-negative-positive triode T4 is by resistance R 2 and NPN type triode T6 simultaneouslyBase stage be connected.
Below in conjunction with normal work, overcurrent protection, forbid output and oppositely end several duties and introduce thisThe operation principle of circuit:
The parameter of the part of devices of this circuit is fixed, wherein resistance R 1 be 10K Ω, resistance R 2 for 5K Ω,Resistance R 3 is that 47K Ω, resistance R 4 are that 500 Ω, resistance R 5 are that 1K Ω, resistance R 6 are 1K Ω, itsThe parameter of his part of devices is selected relevant to specific works ambient condition, need to select according to actual service conditionSuitable value, comprises overcurrent sampling resistor RS1, carrying current setting resistance R p and efficiency-adjusted resistanceRS2。
According to the applied environment that the invention provides circuit, suppose input voltage 5V, the electric current of normal work is100mA, is set as 200mA by circuit overcurrent thresholding, can calculate thus current sampling resistor Rs1Resistance can be set as 3 Ω, efficiency-adjusted resistance R s2 is 500 Ω; Upper limit (UL) Current Limits when load short circuitsBe decided to be 230mA, resistance R p is 15 Ω.
1, normal operating conditions
As shown in Figure 3, while normally work, external control signal Vctr incoming level is low, NPN type three utmost pointsPipe T7 and T8 cut-off (T7 and T8 are mainly responsible for enabling and forbidding by external signal control circuit), NPNType triode T5 conducting; When electric current is less than current limliting thresholding, positive-negative-positive triode T3 is in cut-off state, nowPositive-negative-positive triode T1A is operated in saturated mode, and positive-negative-positive triode T1A saturation voltage drop deficiency is so that NPNType triode T2 conducting, electric current mainly flows to load through positive-negative-positive triode T1A; Now circuit output is pressedReduce to the saturation voltage drop sum (about 0.3V) of RS1 pressure drop and positive-negative-positive triode T1A.
2, overcurrent protection state
As shown in Figure 4, in the time that short circuit appears in load, increase by resistance R S1 electric current, when RS1 two side pressuresFall can make positive-negative-positive triode T3 conducting time, NPN type triode T6 base voltage raises, NPNType triode T6 conducting is in saturation state, and NPN type triode T5 base voltage is less than 0.3V, inBy state, now the base stage path of positive-negative-positive triode T1A blocks, thereby makes positive-negative-positive triode T1ACut-off, main supply access cuts off. In this state, electric current is by Rp and NPN type triode T2 streamTo load, NPN type triode T2 is operated in saturation state, and maximum current is determined by Rp size. Due to justWhen normal power supply and overcurrent protection, positive-negative-positive triode T1A and NPN type triode T2 are all operated in saturatedState, pressure drop is very little, and power consumption is also less, effectively protective transistor.
3, output prohibited state
As shown in Figure 5, if cut off load supplying, need control end Vctr input high level, makeNPN type triode T7 and NPN type triode T8 saturation conduction, control NPN type triode T2, NPNThe voltage of type triode T5 base stage is less than 0.3, makes NPN type triode T2 and NPN type triode T5In cut-off state, positive-negative-positive triode T1A and NPN type triode T2 turn-off like this, major and minorSupply access circuit all can not provide current path, and output end voltage is low, reaches the object that output is turn-offed.
4, reverse blocking state
As shown in Figure 6, often add in electric loading design at some, conventionally can provide with active and standby power supply parallel connection simultaneouslyPower supply, in the time of a certain road power remove or fault, the electric current of working power may be filled with by output is counter in additionBe fed back into end, plant here situation for anti-, inside circuit is provided with reverse protection circuit. Positive-negative-positive triodeT4 and diode D1 and D3 monitor oppositely cut-off control function of backward voltage realization. When output end voltage highIn the time of input terminal voltage, positive-negative-positive triode T4 conducting, its base stage, collector voltage are high level,T6 is saturated for positive-negative-positive triode T4 collector voltage control NPN type triode, makes NPN type triodeT5 base voltage reduces, and NPN type triode T5 is in cut-off state, the base of positive-negative-positive triode T1AUtmost point path disconnects, and positive-negative-positive triode T1A, in cut-off state, prevents main supply access reverse-conducting.And the oppositely cut-off of the secondary knot of the BE for NPN type triode T2 in supply access can not provide reverse electricity equallyCirculation road.
The content not being described in detail in description of the present invention belongs to those skilled in the art's known technology.
Claims (3)
1. the controlled low voltage difference current foldback circuit of output, is characterized in that comprising: primary path, secondary path,Reverse voltage protection circuit, major-minor path overcurrent switch and enable to forbid control circuit, efficiency-adjusted circuit,Overcurrent sample circuit and carrying current initialization circuit, wherein:
Overcurrent sample circuit is for the electric current of the whole holding circuit of sampling;
Major-minor path overcurrent switches and enables to forbid that control circuit is according to current sampling signal and outside input controlSignal switches major-minor path and enables to forbid to be controlled;
When control signal is during in output enable state, by overcurrent sample circuit, the electric current flowing through is sampledMonitor, in the time that electric current is in current limliting thresholding, major-minor path overcurrent switches and enables to forbid control circuit control masterPath is in normal operating conditions, and by the power supplying efficiency of efficiency-adjusted circuit adjustment primary path to load,Primary path output connects load; When the electric current of sampling exceeds current limliting thresholding, major-minor path overcurrent switches and enablesForbid that control circuit control primary path circuit quits work, control secondary path circuitry simultaneously and normally work, pass throughSecondary path provides power supply for load, and secondary path connects load;
Holding circuit is in the time of over-current state, and carrying current initialization circuit arranges and limited the utmost point that flows through secondary pathThreshold currents;
When control signal is in output illegal state, major-minor path overcurrent switches and enables to forbid control circuit controlPrimary path processed and secondary path, in cut-off state, make whole circuit stop providing power supply for load;
Reverse voltage protection circuit is connected in described major-minor path overcurrent switching and enables to forbid control circuit and instituteState between the output of primary path and described secondary path for preventing from preventing in many power supplys parallel operation situation anti-To recharging of voltage;
Primary path comprises a positive-negative-positive triode T1A; Described secondary path comprises NPN type triode T2With resistance R 4; Described major-minor path overcurrent switch and enable to forbid control circuit comprise positive-negative-positive triode T3,NPN type triode T5, NPN type triode T6, NPN type triode T7, NPN type triode T8,Diode D1, diode D3, resistance R 1, resistance R 2, resistance R 5 and resistance R 6; Described reverse electricityVoltage protection circuit comprises positive-negative-positive triode T4 and resistance R 3; Described efficiency-adjusted circuit adopts resistance R s2;Described overcurrent sample circuit adopts resistance R s1; Described carrying current initialization circuit adopts resistance R p;
The base stage of described positive-negative-positive triode T1A is connected to major-minor path overcurrent and switches and enable to forbid to control electricThe colelctor electrode of NPN type triode T5 in road; The colelctor electrode of described positive-negative-positive triode T1A is with secondary logicalPositive-negative-positive triode T4 in emitter stage and the reverse protection circuit of NPN type triode T2 in road sends outEmitter-base bandgap grading is connected; The emitter stage of described positive-negative-positive triode T1A is connected to the switching of major-minor path overcurrent and enables to prohibitThe only base of the NPN type triode T2 in base stage and the secondary path of the positive-negative-positive triode T3 in control circuitOne end of the utmost point and resistance R 4, resistance R s1 and resistance R p;
Positive-negative-positive triode T4's in emitter stage and the reverse protection circuit of described NPN type triode T2Emitter stage is connected; The colelctor electrode of described NPN type triode T2 is connected with the other end of resistance R p; ResistanceThe base stage of the other end of R4 and described NPN type triode T2 and major-minor path overcurrent switch and enable to forbidThe colelctor electrode of NPN type triode T7 in control circuit is connected;
The colelctor electrode of described positive-negative-positive triode T3 is connected with the anode of diode D1, the moon of diode D1The utmost point is connected with the colelctor electrode of positive-negative-positive triode T4 in reverse protection circuit; Described NPN type triode T7Base stage be connected with control end signal by resistance R 5 as the input of enable signal; Described NPN type threeThe base stage of utmost point pipe T8 is connected with control end signal by resistance R 6 as the input of enable signal; DescribedThe base stage of positive-negative-positive triode T3 is connected with one end of Rs1, the anode of described diode D3, described PNPThe emitter of type triode T3 and one end of resistance R 1 are connected with the other end of resistance R s1; ResistanceThe other end of R1 is connected to colelctor electrode and the described NPN type triode T5 of described NPN type triode T8Base stage and the colelctor electrode of described NPN type triode T6;
The colelctor electrode of described positive-negative-positive triode T4 is the base stage with NPN type triode T6 by resistance R 2Be connected; The base stage of described positive-negative-positive triode T4 is by resistance R 3 ground connection.
2. the controlled low voltage difference current foldback circuit of a kind of output according to claim 1, is characterized in that:Described primary path, secondary path, reverse voltage protection circuit, major-minor path overcurrent switch and enable to forbid to be controlledCircuit, efficiency-adjusted circuit, overcurrent sample circuit and carrying current initialization circuit concentrate in a chip.
3. the controlled low voltage difference current foldback circuit of a kind of output according to claim 1, is characterized in that:Described primary path, secondary path, reverse voltage protection circuit, major-minor path overcurrent switch and enable to forbid to be controlledCircuit concentrates in a chip, and efficiency-adjusted circuit, overcurrent sample circuit and carrying current initialization circuit are adoptedThe external form of sample.
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| CN105468078A (en) * | 2015-12-30 | 2016-04-06 | 马瑞利汽车电子(广州)有限公司 | Active current limiting circuit with no branches leaking currents |
| CN107171304B (en) * | 2017-06-08 | 2018-12-25 | 西安微电子技术研究所 | A kind of controllable space computer instruction power current-limiting protection circuit |
| CN109067385A (en) * | 2018-08-14 | 2018-12-21 | 辅易航智能科技(苏州)有限公司 | A kind of onboard sensor power unit switching circuit |
| CN110426551B (en) * | 2019-08-30 | 2023-01-20 | 上海航天测控通信研究所 | Satellite-borne single-particle locking detection recovery circuit |
| CN111007330B (en) * | 2019-11-13 | 2022-07-29 | 中国空间技术研究院 | Method and system for selecting single event locking effect protection resistor |
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| CN102364407A (en) * | 2011-09-20 | 2012-02-29 | 苏州磐启微电子有限公司 | Novel low-dropout linear voltage regulator |
| CN102998515A (en) * | 2012-11-21 | 2013-03-27 | 上海富欣智能交通控制有限公司 | Over-current detection and protection circuit for output channel |
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