CN100553138C - A kind of compound level signal comparing latch unit - Google Patents
A kind of compound level signal comparing latch unit Download PDFInfo
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- CN100553138C CN100553138C CNB2007100697627A CN200710069762A CN100553138C CN 100553138 C CN100553138 C CN 100553138C CN B2007100697627 A CNB2007100697627 A CN B2007100697627A CN 200710069762 A CN200710069762 A CN 200710069762A CN 100553138 C CN100553138 C CN 100553138C
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Abstract
The present invention relates to a kind of level signal comparing latch unit.But the latch that technical problem to be solved provides should have independent detection monitoring and protection multichannel varying level signal, good reliability, low, the advantage of wide range of application of cost.Technical scheme is: a kind of compound level signal comparing latch unit, comprise the comparator that several outputs link, the first input end of each comparator is all as the independent signal input, second input of each comparator is corresponding reference level input separately, and the output of these comparators inserts common return through capacitor C 1 after linking; This latch also is provided with triode Q1, its base stage connects the output of comparator, emitter connecting circuit voltage, collector electrode connects the first input end and the output signal end of one of them comparator respectively, second input of this comparator by behind the signal relief circuit as the ring off signal input, circuit voltage also inserts the output of each comparator by resistance R 4.
Description
Technical field
The present invention relates to a kind of sequential logical circuit, specifically is level signal comparing latch unit.
Background technology
The realization of existing signal latch needs special latch IC, perhaps utilizes other digital circuits.But there are following problems in these circuit:
1, needs special circuit, improved design cost.
2, can not import the varying level pulse signal, and can not be simultaneously the signal of varying level be carried out independent protection.
3, release control signal can not isolated DC, easily causes misoperation that protection was lost efficacy.
Summary of the invention
Technical problem to be solved by this invention provides a kind of improvement of level signal latch; this latch should be able to overcome the deficiency of above-mentioned background technology, but has independent detection monitoring and protection multichannel varying level signal, good reliability, low, the advantage of wide range of application of cost.
Technical scheme provided by the invention is: a kind of compound level signal comparing latch unit, comprise the comparator that several outputs link, the first input end of each comparator is all as the independent signal input, second input of each comparator is corresponding reference level input separately, and the output of these comparators inserts common return through capacitor C 1 after linking; This latch also is provided with triode Q1, its base stage connects the output of comparator, emitter connecting circuit voltage, collector electrode connects the first input end and the output signal end of one of them comparator respectively, second input of this comparator by behind the signal relief circuit as the ring off signal input, circuit voltage also inserts the output that links of each comparator by resistance R 4.
In the signal relief circuit, the ring off signal input is connected in series second input that inserts comparator behind first resistance R 3, capacitor C 2, the diode D1 successively, wherein between capacitor C 2 and the diode D1 also by second resistance R, 7 access common returns.
Operation principle of the present invention is:
When the level in the input signal 1～3 was higher than or be lower than separately reference level, corresponding comparator upset was pulled down to ground level with each comparator output terminal of parallel connection.By R2, triode Q1 conducting, the collector electrode of Q1 output high level, by R5 comparator IC1C-the end level improves, and makes it be higher than its corresponding reference level V3_ref, thereby having realized that comparator output terminal is low level latchs.Simultaneously, the collector electrode of Q1 passes through R1, outwards the variation of output comparator comparative result.
During release, the unlocking signal of pulsed input, C2 can isolate out flip-flop, is transformed into positive pulse by D1 and R7, input IC1C+end, make its voltage be higher than level on the IC1C-end, the comparator upset makes the comparator output terminal of parallel connection become high level; Q1 by, the level on the IC1C-end reverts to the level of input signal 3, circuit restPoses; Simultaneously, output signal upset, output comparator result.
The invention has the beneficial effects as follows: but independent detection monitoring and protection multichannel varying level signal, and the scope of application obviously enlarges; The release control signal realizes isolated DC, has significantly improved reliability; Entire circuit is simple in structure, so cost is also low.
Description of drawings
Fig. 1 is an electrical block diagram of the present invention.
Embodiment
As shown in Figure 1, this compound level signal comparing latch unit, comprise the comparator that several (showing 3 among the figure) outputs link, the first input end of each comparator can independently be imported the signal (as SR1, SR2, SR3) of varying level all as signal input part; Second input of each comparator is corresponding reference level (as V1_ref, V2_ref, V3_ref) input separately, and reference level can require to set according to control; After linking, the output of these comparators inserts common return through capacitor C 1 again.This latch also is provided with triode Q1, and its base stage connects the output of comparator, wherein is connected to resistance R 2; Its emitter connecting circuit voltage; Its collector electrode passes through resistance R 1 back again as output signal end SC by the first input end of one of described comparator of resistance R 5 connections; Second input of this respective comparator by behind the signal relief circuit as ring off signal input JS, circuit voltage (shown in the figure for+15V) also insert the output that links of each comparator by resistance R 4.
Described comparator buyable obtains, and concrete model can require to select according to difference; General model such as LM339 get final product adapted, also can select other model as required.
In the signal relief circuit, ring off signal input JS inserts second input of comparator successively behind series resistor R3, capacitor C 2, the diode D1, and wherein capacitor C 2 also is connected common return by resistance R 7 with wiring between the diode D1.
Claims (1)
1, a kind of compound level signal comparing latch unit, it is characterized in that this comparing latch unit comprises several comparators, and the output of these comparators links, wherein, the first input end of each comparator is all as the independent signal input, second input of each comparator is corresponding reference level input separately, and the output of these comparators passes through electric capacity (C1) access common return after linking; This comparing latch unit also is provided with triode (Q1), its base stage connects the output of comparator, emitter connecting circuit voltage, collector electrode connects the first input end and the output signal end of one of them comparator respectively, and second input of this comparator by behind the signal relief circuit as the ring off signal input, circuit voltage also inserts the output that links of each comparator by resistance (R4); In the described signal relief circuit, ring off signal input (JS) is connected in series second input that comparator is inserted in first resistance (R3), electric capacity (C2), diode (D1) back successively, and wherein electric capacity (C2) also is connected common return by second resistance (R7) with wiring between the diode (D1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100697627A CN100553138C (en) | 2007-06-27 | 2007-06-27 | A kind of compound level signal comparing latch unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100697627A CN100553138C (en) | 2007-06-27 | 2007-06-27 | A kind of compound level signal comparing latch unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101110587A CN101110587A (en) | 2008-01-23 |
| CN100553138C true CN100553138C (en) | 2009-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100697627A Active CN100553138C (en) | 2007-06-27 | 2007-06-27 | A kind of compound level signal comparing latch unit |
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| CN (1) | CN100553138C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410761B (en) * | 2016-11-15 | 2019-10-29 | 芜湖美智空调设备有限公司 | Current foldback circuit, control method and the air conditioner of intelligent power module |
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2007
- 2007-06-27 CN CNB2007100697627A patent/CN100553138C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101110587A (en) | 2008-01-23 |
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Address after: 311300 Zhejiang city of Ling'an Province Jincheng Street stone mirror Street No. 777 Patentee after: ZHEJIANG SHEEN TECHNOLOGY CO., LTD. Address before: 311300 Zhejiang city of Ling'an Province Jincheng Street stone mirror Street No. 777 Patentee before: Zhejiang Xiying Science & Technology Co., Ltd. |