CN203787935U - Over-current protection circuit based on high side current detection - Google Patents
Over-current protection circuit based on high side current detection Download PDFInfo
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- CN203787935U CN203787935U CN201420168443.7U CN201420168443U CN203787935U CN 203787935 U CN203787935 U CN 203787935U CN 201420168443 U CN201420168443 U CN 201420168443U CN 203787935 U CN203787935 U CN 203787935U
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Abstract
The utility model relates to power supply over-current protection, and particularly relates to an over-current protection circuit based on high side current detection so that an over-current protection function of a power supply is improved. The over-current protection circuit comprises a main circuit which is formed by a detection resistor Rs and an electronic switch element via series connection, and a control circuit which controls on/off of the electronic switch element. The free end of the detection resistor Rs is a power supply side connecting end. The free end of the electronic switch element is a load side connecting end, and the control end is connected with the output end of the control circuit. The control circuit comprises a high side current detection module of which the input end is connected with the detection resistor Rs, and an intermediate processing module which is used for judging the output state of the power supply and controlling the working state of the electronic switch element. The input end of the intermediate processing module is connected with the output end of the high side current detection module, and the output end is connected with the control end of the electronic switch element. The over-current protection circuit is reasonable in structure, safe and reliable and low in cost with a self-recovery function so that circuit oscillation is effectively prevented; and the over-current protection circuit is suitable for a coal mine intrinsic safe circuit so that short circuit spark energy can be effectively inhibited.
Description
Technical field
The utility model relates to the overcurrent protection of power supply, specifically a kind of current foldback circuit based on flash current detecting.
Background technology
At present, all multi-users require power supply low cost, high density, highly reliable, and have multi-protective function.All if any: input undervoltage, input overvoltage, excess temperature, output overvoltage, output overcurrent protection (short circuit) etc. aspect defencive function.Wherein, what for user, be concerned about most is output overcurrent protection (short-circuit protection); output overcurrent protection refers in the time of output short-circuit or overload the protection that power supply or load are carried out; output overcurrent protection has various ways; can be divided into the sagging type of rated current, constant-current type, permanent power-type, majority is the sagging type of electric current.Output overcurrent protection is the most obvious on terminal use's impact, does not carry out and can cause an immeasurable loss to terminal use.
Summary of the invention
The utility model, in order to improve the overcurrent protection function of power supply, provides a kind of current foldback circuit based on flash current detecting.
The utility model is to adopt following technical scheme to realize: based on the current foldback circuit of flash current detecting, comprise by the control circuit that detects resistance R s and electronic switching element main circuit in series, control electronic switching element conducting and shutoff; The free end that detects resistance R s is mains side terminals, and the free end of electronic switching element is load-side terminals, and the control end of electronic switching element is connected with the output of control circuit; Described control circuit comprise input and detect flash current detection module that resistance R s is connected, for judging the intermediate process module of power supply output situation and control electronic switching element operating state; The input of intermediate process module is connected with flash current detection module output, and output is connected with the control end of electronic switching element;
Described flash current detection module comprises PNP triode Q1 and the PNP triode Q2 of acquisition testing resistance R s both end voltage, the mirror-image constant flow source being formed by NPN triode Q3, NPN triode Q4, NPN triode Q5, and the mirror-image constant flow source being formed by NPN triode Q6, NPN triode Q7, PNP triode Q8;
The emitter of PNP triode Q1 is connected with detection resistance R s free end, the emitter of PNP triode Q2 is connected with the other end that detects resistance R s, the base stage of PNP triode Q1 is connected with the base stage of PNP triode Q2 through resistance R 6, and the collector electrode of PNP triode Q1 is connected with base stage;
The base stage of collector electrode, NPN triode Q4 and the NPN triode Q5 of NPN triode Q3 is connected with detection resistance R s free end (being the mains side terminals of main circuit) through resistance R 1, and the emitter of NPN triode Q4, NPN triode Q5 is respectively through resistance R 2, R3 ground connection; The base stage of NPN triode Q3 is connected with the emitter of NPN triode Q4, grounded emitter; The collector electrode of NPN triode Q4 is connected with the collector electrode of PNP triode Q1, and the collector electrode of NPN triode Q5 is connected with the collector electrode of PNP triode Q2;
The base stage of PNP triode Q8 is connected with the collector electrode of PNP triode Q2, and emitter is connected with the base stage of PNP triode Q2, and collector electrode is connected with the collector electrode of NPN triode Q6; The base stage of NPN triode Q6 is connected with the base stage of collector electrode, NPN triode Q7, the collector electrode of NPN triode Q7 is connected with the base stage of PNP triode Q8, the emitter of NPN triode Q6, NPN triode Q7 is respectively through resistance R 5, R4 ground connection, and the emitter of NPN triode Q6 and the connected node of resistance R 5 are module output.
When application, main circuit is sealed in to the power supply main line (being between power supply and load) of load, detect the voltage drop of resistance R s by the monitoring of flash current detection module, treatedly convert output signal proportional to main line electric current to, and be transferred to intermediate process module, then judge according to the output signal of flash current detection module whether power supply output over current fault occurs by intermediate process module, and export corresponding triggering signal control electronic switching element operating state, control conducting and the cut-off of main circuit: as there is over current fault, controlling electronic switching element turn-offs, make main circuit cut-off, as normal in power supply output, control electronic switching element conducting, keep main circuit conducting, and then effectively realize the overcurrent protection function of power supply.
As shown in Figure 3, the circuit theory of described flash current detection module is described below: the input Rsence+ of module and Rsence-are connected to the two ends of detecting resistance R s, the mirror-image constant flow source being made up of NPN triode Q3, NPN triode Q4, NPN triode Q5 is powered to PNP triode Q1, Q2, and resistance R 2 is identical with resistance R 3, guarantee, for PNP triode Q1, Q2 provide identical electric current, to make PNP triode Q1, Q2 be operated in the state of characteristic close, PNP triode Q1 provides the reference voltage of relatively high-end skew, PNP triode Q2 provides the offset voltage of relative detection resistance R s dividing potential drop, after dividing potential drop on inspection resistance R s is offset by PNP triode Q2, the reference voltage providing with PNP triode Q1 produces a pressure reduction that is numerically equal to inspection resistance R s self pressure drop, this pressure reduction forms electric current in resistance R 6, and pass through by NPN triode Q6, NPN triode Q7, the mirror-image constant flow source that PNP triode Q8 forms, in the resistance R 5 on a road, form therein output, another road is input to PNP triode Q2, be used for compensating the voltage error that PNP triode Q1 has formed because having increased the shunting of resistance R 6.Wherein, the ratio of resistance R 5 and resistance R 6 has determined the multiplication factor of flash current detection module; Resistance R 4 is more smaller than resistance R 5, and effect is on PNP triode Q2, to form certain overcompensation (positive feedback in other words), reduces the circuit gain error of bringing because transistor multiplication factor is limited.
The computational process of flash current detection module Output rusults is as follows:
Flow through the electric current of resistance R 6
（1）
Q2 is identical for PNP triode Q1, PNP triode, and is operated in the state of characteristic close, therefore
;
（2）
And
(3)
（4）
Cause
much smaller than
therefore, omit
(5)
(5)
Wherein,
;
Thereby
(6)
（7）
R5=20K Ω in this circuit, R6=1K Ω
Therefore in theory
(8)
It is flash current detection module output
the direct voltage over the ground of output detections resistance R s voltage drop fixed multiplying power 20.
Described electronic switching element adopts P-channel enhancement type field effect transistor, and its source electrode is connected with detection resistance R s, drains as load-side terminals, and grid is connected with control circuit output.Described electronic switching element can also adopt bidirectional triode thyristor, transistor.Adopt the advantage of P-channel enhancement type field effect transistor to be: input impedance is large, and leakage current is little, and while normally working conducting, the little caloric value of internal resistance is little.
Described intermediate process module comprises voltage comparator U2, voltage comparator U3, by resistance R 7 and resistance R 8 dividing potential drop branch road in series and by resistance R 11 and resistance R 12 dividing potential drop branch road in series; The end of oppisite phase of voltage comparator U2 is connected with the output of flash current detection module, and in-phase end is connected with the connected node between resistance R 7, resistance R 8, and output is connected with the end of oppisite phase of voltage comparator U3 through backward diode D1; The in-phase end of voltage comparator U3 is connected with the connected node between resistance R 11, resistance R 12, and end of oppisite phase is through capacitor C 1 ground connection, and connects power supply VCC through resistance R 10; The pull-up resistor R13 of voltage comparator U3 is series at voltage comparator U3 output and detects between resistance R s.Described intermediate process module can also adopt the realization such as integrated circuit (IC) chip, programmable logic device (CPLD).The advantage that adopts voltage comparator to build foregoing circuit is: circuit is simple, device is drawn materials easily, cost is low.
Under normal circumstances, the output of flash current detection module U1
, the output of voltage comparator U2
for high level, now, diode D1 cut-off, capacitor C 1 is full of electricity, the end of oppisite phase voltage of voltage comparator U3
, the output of voltage comparator U3
for low level, P-channel enhancement type field effect transistor opens that load is obtained is electric; In the time there is over current fault in main line, the output of flash current detection module
, the output of voltage comparator U2
for low level, diode D1 conducting, capacitor C 1 is discharged rapidly, makes
, the output of voltage comparator U3
saltus step is high level, and P-channel enhancement type field effect transistor is turn-offed.Now, flash current detection module can't detect electric current, the output of flash current detection module
, the output of voltage comparator U2
saltus step is high level, and capacitor C 1 starts to charge by resistance R 4, and the charging interval is
(9)
Process
after time, the end of oppisite phase voltage of voltage comparator U3
, the output of voltage comparator U3
for low level, P-channel enhancement type field effect transistor opens that load is obtained is electric; If over current fault is eliminated, short-circuit protection circuit, from recovering, makes main line recover normal, otherwise breaking circuit again, and due to the setting of delay capacitor C1, has effectively prevented that main line from occurring for electric oscillation.
Compared with prior art, the utility model belongs to the sagging type current foldback circuit of rated current, breaking circuit in the time there is overcurrent, and making electric current is zero; The utility model adopts flash current detection technology Real-Time Monitoring flash electric current, and detection resistance is placed between high side-power supply and load, has not only eliminated the ground wire occurring in low frontier inspection survey and has disturbed, and can detect power supply and short trouble systematically; And flash current detection module adopts discrete transistor to realize, as long as be no more than the withstand voltage of transistor, just can avoid adopting amplifier to carry out the too high problem of input common mode voltage that flash current sample can run into, can solve the input common mode voltage problem that approaches supply voltage, there is the advantages such as safe and reliable, with low cost, simple in structure and low-power consumption.
The utility model is rational in infrastructure, safe and reliable, with low cost, has self-recovering function, has effectively prevented circuit oscillation; Be applicable to coal mine intrinsic safety circuit, can effectively suppress short-circuit spark energy.
Brief description of the drawings
Fig. 1 is functional-block diagram of the present utility model;
Fig. 2 is a physical circuit schematic diagram of the present utility model;
Fig. 3 is the circuit theory diagrams of flash current detection module described in the utility model.
Embodiment
As shown in Figure 1, based on the current foldback circuit of flash current detecting, comprise by the control circuit that detects resistance R s and electronic switching element main circuit in series, control electronic switching element conducting and shutoff, the free end that detects resistance R s is mains side terminals, the free end of electronic switching element is load-side terminals, and the control end of electronic switching element is connected with the output of control circuit; Described control circuit comprise input and detect flash current detection module that resistance R s is connected, for judging the intermediate process module of power supply output situation and control electronic switching element operating state; The input of intermediate process module is connected with flash current detection module output, and output is connected with the control end of electronic switching element;
As shown in Figure 3, described flash current detection module comprises PNP triode Q1 and the PNP triode Q2 of acquisition testing resistance R s both end voltage, the mirror-image constant flow source being formed by NPN triode Q3, NPN triode Q4, NPN triode Q5, and the mirror-image constant flow source being formed by NPN triode Q6, NPN triode Q7, PNP triode Q8;
The emitter of PNP triode Q1 is connected with detection resistance R s free end, the emitter of PNP triode Q2 is connected with the other end that detects resistance R s, the base stage of PNP triode Q1 is connected with the base stage of PNP triode Q2 through resistance R 6, and the collector electrode of PNP triode Q1 is connected with base stage;
The base stage of collector electrode, NPN triode Q4 and the NPN triode Q5 of NPN triode Q3 is connected with detection resistance R s free end (being the mains side terminals of main circuit) through resistance R 1, and the emitter of NPN triode Q4, NPN triode Q5 is respectively through resistance R 2, R3 ground connection; The base stage of NPN triode Q3 is connected with the emitter of NPN triode Q4, grounded emitter; The collector electrode of NPN triode Q4 is connected with the collector electrode of PNP triode Q1, and the collector electrode of NPN triode Q5 is connected with the collector electrode of PNP triode Q2;
The base stage of PNP triode Q8 is connected with the collector electrode of PNP triode Q2, and emitter is connected with the base stage of PNP triode Q2, and collector electrode is connected with the collector electrode of NPN triode Q6; The base stage of NPN triode Q6 is connected with the base stage of collector electrode, NPN triode Q7, the collector electrode of NPN triode Q7 is connected with the base stage of PNP triode Q8, the emitter of NPN triode Q6, NPN triode Q7 is respectively through resistance R 5, R4 ground connection, and the emitter of NPN triode Q6 and the connected node of resistance R 5 are module output.
As shown in Figure 2, described electronic switching element adopts P-channel enhancement type field effect transistor, and its source electrode is connected with detection resistance R s, drains as load-side terminals, and grid is connected with control circuit output; Described P-channel enhancement type field effect transistor is selected IRF9530 type P-channel enhancement type field effect transistor; Described intermediate process module comprises voltage comparator U2, voltage comparator U3, by resistance R 7 and resistance R 8 dividing potential drop branch road in series and by resistance R 11 and resistance R 12 dividing potential drop branch road in series; The end of oppisite phase of voltage comparator U2 is connected with the output of flash current detection module, and in-phase end is connected with the connected node between resistance R 7, resistance R 8, and output is connected with the end of oppisite phase of voltage comparator U3 through backward diode D1; The in-phase end of voltage comparator U3 is connected with the connected node between resistance R 11, resistance R 12, and end of oppisite phase is through capacitor C 1 ground connection, and connects power supply VCC through resistance R 10; The pull-up resistor R13 of voltage comparator U3 is series at voltage comparator U3 output and detects between resistance R s.Voltage comparator U2, U3 adopt LM339 voltage comparator chip.
More than describe preferred embodiment of the present utility model in detail.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to design of the present utility model without creative work.Therefore, all technical staff in the art comply with design of the present utility model on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in by the determined protection range of claims.
Claims (3)
1. the current foldback circuit based on flash current detecting, it is characterized in that: comprise by the control circuit that detects resistance R s and electronic switching element main circuit in series, control electronic switching element conducting and shutoff, the free end that detects resistance R s is mains side terminals, the free end of electronic switching element is load-side terminals, and the control end of electronic switching element is connected with the output of control circuit; Described control circuit comprise input and detect flash current detection module that resistance R s is connected, for judging the intermediate process module of power supply output situation and control electronic switching element operating state; The input of intermediate process module is connected with flash current detection module output, and output is connected with the control end of electronic switching element;
Described flash current detection module comprises PNP triode Q1 and the PNP triode Q2 of acquisition testing resistance R s both end voltage, the mirror-image constant flow source being formed by NPN triode Q3, NPN triode Q4, NPN triode Q5, and the mirror-image constant flow source being formed by NPN triode Q6, NPN triode Q7, PNP triode Q8;
The emitter of PNP triode Q1 is connected with detection resistance R s free end, the emitter of PNP triode Q2 is connected with the other end that detects resistance R s, the base stage of PNP triode Q1 is connected with the base stage of PNP triode Q2 through resistance R 6, and the collector electrode of PNP triode Q1 is connected with base stage;
The base stage of collector electrode, NPN triode Q4 and the NPN triode Q5 of NPN triode Q3 is connected with detection resistance R s free end through resistance R 1, and the emitter of NPN triode Q4, NPN triode Q5 is respectively through resistance R 2, R3 ground connection; The base stage of NPN triode Q3 is connected with the emitter of NPN triode Q4, grounded emitter; The collector electrode of NPN triode Q4 is connected with the collector electrode of PNP triode Q1, and the collector electrode of NPN triode Q5 is connected with the collector electrode of PNP triode Q2;
The base stage of PNP triode Q8 is connected with the collector electrode of PNP triode Q2, and emitter is connected with the base stage of PNP triode Q2, and collector electrode is connected with the collector electrode of NPN triode Q6; The base stage of NPN triode Q6 is connected with the base stage of collector electrode, NPN triode Q7, the collector electrode of NPN triode Q7 is connected with the base stage of PNP triode Q8, the emitter of NPN triode Q6, NPN triode Q7 is respectively through resistance R 5, R4 ground connection, and the emitter of NPN triode Q6 and the connected node of resistance R 5 are module output.
2. the current foldback circuit based on flash current detecting according to claim 1; it is characterized in that: described electronic switching element adopts P-channel enhancement type field effect transistor; its source electrode is connected with detection resistance R s, drains as load-side terminals, and grid is connected with control circuit output.
3. the current foldback circuit based on flash current detecting according to claim 1 and 2, is characterized in that: described intermediate process module comprises voltage comparator U2, voltage comparator U3, by resistance R 7 and resistance R 8 dividing potential drop branch road in series and by resistance R 11 and resistance R 12 dividing potential drop branch road in series; The end of oppisite phase of voltage comparator U2 is connected with the output of flash current detection module, and in-phase end is connected with the connected node between resistance R 7, resistance R 8, and output is connected with the end of oppisite phase of voltage comparator U3 through backward diode D1; The in-phase end of voltage comparator U3 is connected with the connected node between resistance R 11, resistance R 12, and end of oppisite phase is through capacitor C 1 ground connection, and connects power supply VCC through resistance R 10; The pull-up resistor R13 of voltage comparator U3 is series at voltage comparator U3 output and detects between resistance R s.
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| CN201420168443.7U CN203787935U (en) | 2014-04-09 | 2014-04-09 | Over-current protection circuit based on high side current detection |
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| CN105929220A (en) * | 2016-04-19 | 2016-09-07 | 南京埃斯顿自动化股份有限公司 | Over-current detection circuit |
| CN106229954A (en) * | 2016-09-19 | 2016-12-14 | 中国电子科技集团公司第十八研究所 | Self-adaptive overcurrent protection circuit |
| CN106849020A (en) * | 2015-11-25 | 2017-06-13 | 菲尼克斯电气公司 | A kind of power semiconductor protection device |
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| CN106229954A (en) * | 2016-09-19 | 2016-12-14 | 中国电子科技集团公司第十八研究所 | Self-adaptive overcurrent protection circuit |
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| CN113866491A (en) * | 2021-09-08 | 2021-12-31 | 中国航空工业集团公司西安航空计算技术研究所 | Over-current detection circuit of winding driving circuit and design method thereof |
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