CN203632210U - Rapid over-current protection locking circuit - Google Patents
Rapid over-current protection locking circuit Download PDFInfo
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- CN203632210U CN203632210U CN201320879758.8U CN201320879758U CN203632210U CN 203632210 U CN203632210 U CN 203632210U CN 201320879758 U CN201320879758 U CN 201320879758U CN 203632210 U CN203632210 U CN 203632210U
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Abstract
The utility model is a rapid over-current protection locking circuit which comprises a pull-up resistor (1), a comparator (2), a voltage-dividing reference circuit (3), an acceleration locking circuit (4) and a current sampling circuit (5). The pull-up resistor is a common resistor to enable the comparator to output a reliable and determined level. The comparator proportions sample current into voltage and then compares the voltage with sample reference voltage. The voltage-dividing reference circuit provides the sample reference voltage for the comparator. The acceleration locking circuit is in an acceleration locking and further over-current locking state. The current sampling circuit enables the sample current to pass through the resistor so as to generate voltage drop, and thus the V/I relation of a sample is produced, and a current sampling effect is achieved. The rapid over-current protection locking circuit is few in component, simple and reliable in circuit implementation, ingenious in design, excellent in performance, convenient and practical.
Description
Technical field
The utility model is a kind of overcurrent protection lock-in circuit fast, belongs to the renovation technique of quick overcurrent protection lock-in circuit.
Background technology
At present, in the driving of various power devices and the related system of power management, overcurrent protection is a very important topic, and overcurrent protection is processed after generally adopting sample rate current analysis.As be by going here and there a sample resistance, current signal is converted to voltage signal, realizing the upset of comparative level by comparator.In practical application, still there are the following problems for this protective circuit: 1) being applied to during three motors drive, the electric current that flows through motor internal is three to alternate, and will likely occur like this situation of single-phase overcurrent; 2) corresponding traditional over-current detection is just by comparator trigging signal, and within very short time, to obtain the embodiment of comparator be after a very little pulsewidth, to recover normal to overcurrent, and overcurrent of this situation reality.
In sum, for overcurrent protection, need a kind of circuit of positive lock overcurrent to solve above problem.
Utility model content
The purpose of this utility model is to consider the problems referred to above and provides a kind of number of elements few, and circuit is realized simple and reliable quick overcurrent protection lock-in circuit.The utility model is reasonable in design, convenient and practical.
The technical solution of the utility model is: quick overcurrent protection lock-in circuit of the present utility model, include pull-up resistor, comparator, dividing potential drop reference circuit, accelerate lock-in circuit and current sampling circuit, wherein pull-up resistor is resistance R 79, comparator is comparator IC1A, dividing potential drop reference circuit includes resistance R 77, resistance R 80 and capacitor C 46, accelerate lock-in circuit and include triode Q3, resistance R 75, resistance R 73, current sampling circuit (5) includes resistance R 83, wherein the base stage of triode Q3 is connected with one end of resistance R 75, the other end of resistance R 75 is connected with the output of comparator IC1A, the emitter of triode Q3 is connected with power supply VCC, the collector electrode of triode Q3 is by resistance R 73 ground connection, the negative pole of comparator IC1A input is connected with one end of resistance R 83 and is connected with one end of resistance R 82, the other end ground connection of resistance R 83, the other end of resistance R 82 is connected with the negative pole of diode D12, the plus earth of diode D12 and being connected with one end of capacitor C 44, the other end of capacitor C 44 is connected with the collector electrode of triode Q3 and is connected with resistance R 73, the positive pole of comparator IC1A input is connected with one end of resistance R 77 and resistance R 80, the other end of resistance R 77 is connected with power supply VCC, the other end ground connection of resistance R 80, capacitor C 46 is connected to the two ends of resistance R 80.
Above-mentioned capacitor C 44 is electrochemical capacitors.
Above-mentioned diode D12 is capacitance group.
The beneficial effects of the utility model are: quick overcurrent protection lock-in circuit of the present utility model, described pull-up resistor is conventional, electric-resistance, allows one of comparator output reliably determine level.Described comparator bear by sampling current ratio be after voltage with the comparison of sampling reference voltage.Described dividing potential drop reference circuit provides sampling reference voltage for comparator.Described acceleration lock-in circuit is one and accelerates locking, further locks over-current state.Described current sampling circuit makes sampling current produce pressure drop by resistance, forms the V/I relation to sample, reaches the effect of sampling current.The utility model number of elements is few, and circuit is realized simple and reliable, is that a kind of design is ingenious, function admirable, convenient and practical quick overcurrent protection lock-in circuit.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
Embodiment
Below in conjunction with embodiment, the utility model is further described.Wherein, accompanying drawing is only for exemplary illustration, expression be only schematic diagram, but not pictorial diagram can not be interpreted as the restriction to this patent; For embodiment of the present utility model is described better, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product; For a person skilled in the art, in accompanying drawing some known features and explanation thereof may to omit be understandable.
Schematic diagram of the present utility model as shown in Figure 1, quick overcurrent protection lock-in circuit of the present utility model, include pull-up resistor 1, comparator 2, dividing potential drop reference circuit 3, accelerate lock-in circuit 4 and current sampling circuit 5, wherein pull-up resistor 1 is resistance R 79, comparator 2 is comparator IC1A, dividing potential drop reference circuit 3 includes resistance R 77, resistance R 80 and capacitor C 46, accelerate lock-in circuit 4 and include triode Q3, resistance R 75, resistance R 73, current sampling circuit 5 includes resistance R 83, wherein the base stage of triode Q3 is connected with one end of resistance R 75, the other end of resistance R 75 is connected with the output of comparator IC1A, the emitter of triode Q3 is connected with power supply VCC, the collector electrode of triode Q3 is by resistance R 73 ground connection, the negative pole of comparator IC1A input is connected with one end of resistance R 83 and is connected with one end of resistance R 82, the other end ground connection of resistance R 83, the other end of resistance R 82 is connected with the negative pole of diode D12, the plus earth of diode D12 and being connected with one end of capacitor C 44, the other end of capacitor C 44 is connected with the collector electrode of triode Q3 and is connected with resistance R 73, the positive pole of comparator IC1A input is connected with one end of resistance R 77 and resistance R 80, the other end of resistance R 77 is connected with power supply VCC, the other end ground connection of resistance R 80, capacitor C 46 is connected to the two ends of resistance R 80.
In the present embodiment, above-mentioned capacitor C 44 is electrochemical capacitors.Above-mentioned diode D12 is capacitance group.
Described pull-up resistor 1 is conventional, electric-resistance, allows one of comparator output reliably determine level.Described comparator 2 bear by sampling current ratio be after voltage with the comparison of sampling reference voltage.Described dividing potential drop reference circuit 3 provides sampling reference voltage for comparator.Described acceleration lock-in circuit 4 is one and accelerates locking, when comparator has a low level output, be that Q3 base stage is low, Q3 conducting, VCC charges to C44 by Q3, charging process, C44 voltage can not suddenly change, and will substantially maintain VCC, flows to R82 by D12, continuing is that comparator cathode voltage is raised, the over-current state of further entering.Described current sampling circuit 5 is to make sampling current produce pressure drop by resistance, forms the V/I relation to sample, reaches the effect of sampling current
the operation principle of the present embodiment is:with reference to Fig. 1, electric current I test flows through described current sampling circuit 5 and flows to ground by flowing through R83, on R83 resistance, produces pressure drop, and described dividing potential drop reference circuit 3 can be by regulating the dividing potential drop of two resistance to realize determining of reference voltage V ref.Comparator 2, by more positive and negative two voltages of extremely going up, decides the level of output, in the time of overcurrent, and Vout output low level, thus make the Q3 conducting in described acceleration lock-in circuit 4, draw high 4 pin of comparator, accelerate locking overcurrent moment.
Obviously, above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description, here without also giving exhaustive to all execution modes.All any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in the protection range of the utility model claim.
Claims (3)
1. a quick overcurrent protection lock-in circuit, it is characterized in that including pull-up resistor (1), comparator (2), dividing potential drop reference circuit (3), accelerate lock-in circuit (4) and current sampling circuit (5), wherein pull-up resistor (1) is resistance R 79, comparator (2) is comparator IC1A, dividing potential drop reference circuit (3), include resistance R 77, resistance R 80 and capacitor C 46, accelerate lock-in circuit (4) and include triode Q3, resistance R 75, resistance R 73, current sampling circuit (5) includes resistance R 83, wherein the base stage of triode Q3 is connected with one end of resistance R 75, the other end of resistance R 75 is connected with the output of comparator IC1A, the emitter of triode Q3 is connected with power supply VCC, the collector electrode of triode Q3 is by resistance R 73 ground connection, the negative pole of comparator IC1A input is connected with one end of resistance R 83 and is connected with one end of resistance R 82, the other end ground connection of resistance R 83, the other end of resistance R 82 is connected with the negative pole of diode D12, the plus earth of diode D12 and being connected with one end of capacitor C 44, the other end of capacitor C 44 is connected with the collector electrode of triode Q3 and is connected with resistance R 73, the positive pole of comparator IC1A input is connected with one end of resistance R 77 and resistance R 80, the other end of resistance R 77 is connected with power supply VCC, the other end ground connection of resistance R 80, capacitor C 46 is connected to the two ends of resistance R 80.
2. quick overcurrent protection lock-in circuit according to claim 1, is characterized in that above-mentioned capacitor C 44 is electrochemical capacitors.
3. quick overcurrent protection lock-in circuit according to claim 1, is characterized in that above-mentioned diode D12 is capacitance group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320879758.8U CN203632210U (en) | 2013-12-30 | 2013-12-30 | Rapid over-current protection locking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320879758.8U CN203632210U (en) | 2013-12-30 | 2013-12-30 | Rapid over-current protection locking circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203632210U true CN203632210U (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320879758.8U Expired - Fee Related CN203632210U (en) | 2013-12-30 | 2013-12-30 | Rapid over-current protection locking circuit |
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| CN (1) | CN203632210U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106068504A (en) * | 2014-10-17 | 2016-11-02 | 利盟国际有限公司 | For arranging the system of module's address |
-
2013
- 2013-12-30 CN CN201320879758.8U patent/CN203632210U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106068504A (en) * | 2014-10-17 | 2016-11-02 | 利盟国际有限公司 | For arranging the system of module's address |
| CN106068504B (en) * | 2014-10-17 | 2019-04-05 | 利盟国际有限公司 | System for setup module address |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140604 Termination date: 20181230 |
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| CF01 | Termination of patent right due to non-payment of annual fee |