CN101294991A - Flip-latch for electric voltage dropping detection - Google Patents
Flip-latch for electric voltage dropping detection Download PDFInfo
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- CN101294991A CN101294991A CNA2008100622555A CN200810062255A CN101294991A CN 101294991 A CN101294991 A CN 101294991A CN A2008100622555 A CNA2008100622555 A CN A2008100622555A CN 200810062255 A CN200810062255 A CN 200810062255A CN 101294991 A CN101294991 A CN 101294991A
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Abstract
The invention relates to a circuit which detects voltage signals and outputs, latches and unlatches detection results. The technical problem to be solved is that the circuit with the characteristics of reliable operation, anti-interference and lower cost is provided. The technical proposal is that: a latch used for detecting voltage dips, a voltage to be detected J4 and a voltage reference circuit are respectively accessed to 'plus' and 'minus' input ends of a voltage comparator ICIA, the 'minus' input end of the voltage comparator ICIA is also accessed with an unlatching circuit and a latching circuit at the same time; an output end of the voltage comparator ICIA outputs the detection results; a control end of the latching circuit is communicated with the output end of the voltage comparator ICIA; the latching circuit also drives a latching output circuit to output latching results.
Description
Technical field
The present invention relates to the signal deteching circuit in a kind of current control circuit, specifically is the circuit that voltage signal is detected and testing result is exported, latched and latchs releasing.
Background technology
In recent years, the power sensitive equipment based on microprocessor control has been widely used in commercial production and the daily life; And electric voltage dropping can influence their operate as normal, brings economic loss to the user.For the holding circuit of existing various power equipments configuration, detecting in real time that supply voltage falls and adopt corresponding measure is wherein a vital task.
Detect the electric voltage dropping situation at present, generally adopt special latch IC, perhaps utilize other digital circuits to realize.But there are following problems in these circuit:
1, needs special circuit, improved design and manufacturing cost.
2, release control signal can not isolated DC, easily causes misoperation that protection was lost efficacy.
Summary of the invention
Technical matters to be solved by this invention provides a kind of improvement of signal deteching circuit, and this circuit should be able to overcome the deficiency of above-mentioned background technology, have reliable, jamproof characteristics, and cost is lower.
Technical scheme provided by the invention is:
A kind ofly be used for the latch that electric voltage dropping detects, insert tested voltage J4 and voltage reference circuit respectively at "+", "-" input end of voltage comparator ic 1A, "-" input end of voltage comparator ic 1A also inserts a release circuit and latch cicuit simultaneously; The output terminal output testing result of voltage comparator ic 1A; The control end of described latch cicuit is connected the output terminal of voltage comparator ic 1A; Described latch cicuit also drives a latch circuit output with the output latch result.
In the described voltage reference circuit, the bleeder circuit that reference voltage Vref is formed by resistance R 9 and resistance R 3 offers voltage comparator ic 1A.
In the described release circuit: resistance R 5, capacitor C 1 and the diode D1 series connection that oppositely inserts insert, and the connecting line between capacitor C 1 and the diode D1 is also by resistance R 6 ground connection.
In the described latch cicuit: by the collector and emitter of triode Q1 and "-" input end of resistance R 4 access voltage comparator ic 1A, circuit voltage VCC is added to the base stage of triode Q1 again to circuit voltage VCC successively by resistance R 8, resistance R 1 successively; Connecting line between resistance R 8 and the resistance R 1 is also connected the output terminal of voltage comparator ic 1A, so that control opening or closing of latch cicuit.
In the described latch circuit output: the connecting line between triode Q1 and the resistance R 4 is connected the base stage of triode Q2, and the collector and emitter of triode Q2 is respectively as latch result output terminal and earth terminal.
Connecting line between triode Q1 and the resistance R 4 is also connected the base stage of triode Q2 by resistance R 2.
Principle of work of the present invention is:
When tested voltage is higher than reference voltage, testing result output high level, latch result output high-impedance state.
When tested voltage J4 falls, when being lower than "-" input terminal voltage of voltage comparator ic 1A, voltage comparator ic 1A output end voltage J1 (testing result output) becomes 0V.Through resistance R 1, triode Q1 conducting, the upper end of resistance R 4 becomes high level, and through the dividing potential drop of resistance R 4, R3 and R9, "-" input end level of voltage comparator ic 1A is drawn high.Simultaneously, through resistance R 2, triode Q2 conducting, output end voltage J1 (latch result output) is a low resistance state.
Because "-" input end level is drawn high, even tested voltage raises once more, can not be higher than "-" input end level of voltage comparator ic 1A, voltage comparator ic 1A output (testing result output) can keep 0V always.
During unlocking operation, the negative edge of unlocking signal J3 can form electric current left on capacitor C1 and diode D1, cause "-" input terminal voltage of voltage comparator ic 1A to descend, be lower than the tested voltage signal of its "+" input end, voltage comparator ic 1A output (testing result output) becomes high level; And by resistance R 1, triode Q1 ends, and the upper end of resistance R 4 becomes low level, and "-" input end level of voltage comparator ic 1A returns to original voltage.Simultaneously, through resistance R 2, triode Q2 ends, and latch result J2 exports high-impedance state.
Latch provided by the invention; the accurately dynamic change of perception supply voltage delicately; in time detect and catch the electric voltage dropping signal; and unlocking signal is realized by isolated DC; isolated the interference that other circuit malfunctions cause; the loss of having avoided runaway electric circuit to cause has improved circuit reliability, can be used for the protection of excess current effectively.In addition, owing to the components and parts that adopt significantly reduce, so manufacturing cost has decline by a relatively large margin.
Description of drawings
Fig. 1 is an electrical block diagram of the present invention.
Fig. 2 is a circuit box structure synoptic diagram of the present invention.
Embodiment
The latch that is used for the electric voltage dropping detection shown in Figure 1, two input ends of "+", "-" at voltage comparator ic 1A insert tested voltage J4 and voltage reference circuit (in this circuit, the bleeder circuit that reference voltage Vref is formed by resistance R 9, resistance R 3 is added on the voltage comparator ic 1A) respectively; "-" input end of voltage comparator ic 1A also inserts a unlocking signal circuit and a latch cicuit respectively, and latch cicuit also drives a latch circuit output with the output latch result; In the described unlocking signal circuit: resistance R 5, capacitor C 1 and the diode D1 series connection that oppositely inserts insert, and the connecting line between capacitor C 1 and the diode D1 is also by resistance R 6 ground connection; In the described latch cicuit: circuit voltage VCC is successively by the collector and emitter of triode Q1 and "-" input end of resistance R 4 access voltage comparator ic 1A, circuit voltage VCC is added to the base stage of triode Q1 again successively by resistance R 8, resistance R 1, the output terminal of voltage comparator ic 1A is also connected the connecting line between resistance R 8 and the resistance R 1, so that directly control the unlatching of latch cicuit or close.
In the described latch circuit output: the connecting line between triode Q1 and the resistance R 4 is received the base stage of triode Q2 by resistance R 2, and the collector and emitter of triode Q2 is respectively as latch result output terminal and earth terminal.
Described comparer buyable obtains, and generally can select LM339 for use; Also can select other model as required.
Through test, this scheme technology is reliable, and cost is low.
Claims (6)
1, a kind of latch that is used for the electric voltage dropping detection, it is characterized in that "+", "-" input end at voltage comparator (IC1A) insert tested voltage (J4) and voltage reference circuit respectively, "-" input end of voltage comparator also inserts a release circuit and latch cicuit simultaneously; The output terminal output testing result of voltage comparator; The control end of described latch cicuit is connected the output terminal of voltage comparator; Described latch cicuit also drives a latch circuit output with the output latch result.
2, a kind of latch that electric voltage dropping detects that is used for according to claim 1 is characterized in that in the described voltage reference circuit that the bleeder circuit that reference voltage (Vref) is formed by resistance (R9) and resistance (R3) offers voltage comparator (IC1A).
3, a kind of latch that electric voltage dropping detects that is used for according to claim 1, it is characterized in that in the described release circuit: resistance (R5), electric capacity (C1) and diode (D1) series connection that oppositely inserts insert, and the connecting line between electric capacity (C1) and the diode (D1) is also by resistance (R6) ground connection.
4, a kind of latch that electric voltage dropping detects that is used for according to claim 1, it is characterized in that in the described latch cicuit: by the collector and emitter of triode (Q1) and "-" input end of resistance (R4) access voltage comparator (IC1A), circuit voltage (VCC) is added to the base stage of triode (Q1) again to circuit voltage (VCC) successively by resistance (R8), resistance (R1) successively; Connecting line between resistance (R8) and the resistance (R1) is also connected the output terminal of voltage comparator (IC1A), so that control opening or closing of latch cicuit.
5, according to claim 2 or 3 or 4 described a kind of latchs that electric voltage dropping detects that are used for, it is characterized in that in the described latch circuit output: the connecting line between triode (Q1) and the resistance (R4) is connected the base stage of triode (Q2), and the collector and emitter of triode (Q2) is respectively as latch result output terminal and earth terminal.
6, a kind of latch that electric voltage dropping detects that is used for according to claim 5 is characterized in that the connecting line between triode (Q1) and the resistance (R4) also passes through the base stage that resistance (R2) is connected triode (Q2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100622555A CN101294991A (en) | 2008-06-11 | 2008-06-11 | Flip-latch for electric voltage dropping detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100622555A CN101294991A (en) | 2008-06-11 | 2008-06-11 | Flip-latch for electric voltage dropping detection |
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| Publication Number | Publication Date |
|---|---|
| CN101294991A true CN101294991A (en) | 2008-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100622555A Pending CN101294991A (en) | 2008-06-11 | 2008-06-11 | Flip-latch for electric voltage dropping detection |
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| Country | Link |
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| CN (1) | CN101294991A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852628A (en) * | 2012-11-28 | 2014-06-11 | 深圳市海洋王照明工程有限公司 | Overvoltage protection circuit and overvoltage detection circuit thereof |
-
2008
- 2008-06-11 CN CNA2008100622555A patent/CN101294991A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852628A (en) * | 2012-11-28 | 2014-06-11 | 深圳市海洋王照明工程有限公司 | Overvoltage protection circuit and overvoltage detection circuit thereof |
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Open date: 20081029 |