CN201854255U - Differential pulse width modulation circuit - Google Patents
Differential pulse width modulation circuit Download PDFInfo
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- CN201854255U CN201854255U CN2010206017427U CN201020601742U CN201854255U CN 201854255 U CN201854255 U CN 201854255U CN 2010206017427 U CN2010206017427 U CN 2010206017427U CN 201020601742 U CN201020601742 U CN 201020601742U CN 201854255 U CN201854255 U CN 201854255U
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Abstract
The utility model discloses a differential pulse width modulation circuit. The non-inverting input end of a first comparator is connected with reference voltage, the inverting input end of the first comparator is connected with one end of a first differential capacitor, and the other end of the first differential capacitor is grounded; the output end of the first comparator is connected with the first input end of a bistable trigger, and the first output end of the bistable trigger is connected to the connecting point between the first comparator and the first differential capacitor; the non-inverting input end of a second comparator is also connected with reference voltage, the inverting input end of the second comparator is connected with one end of a second differential capacitor, and the other end of the second differential capacitor is grounded; the output end of the second comparator is connected with the second input end of the bistable trigger, and the second output end of the bistable trigger is connected to the connecting point between the second comparator and the second differential capacitor. The differential pulse width modulation circuit is matched with the capacitors to complete the sensing task.
Description
Technical field
The utility model relates to capacitive displacement transducer, is specifically related to be used for the differential pulse-width modulation circuit of capacitive displacement transducer.
Background technology
The potentiometer that constitutes with slide wire resistance is the simplest displacement transducer, and its unloaded output voltage is directly proportional with the displacement of sliding point.This transducer is with a long history, still can see in some pressure gauge with transmission device and automatic potentiometer so far.Its major defect is that frictional resistance is arranged, and resistance wire can influence use because of wearing and tearing, contamination, oxidation.Though occur through improving existing conductive plastic potentiometer, this class has sliding dot structure non-developing direction eventually.
Moved following advantage with the capacitance sensor location: simple in structure, adaptability is strong.Capacitance sensor is the pole plate of a pair of mutual insulating, as long as material has the ring of need property and ageing resistance, and just can long-term work.Non-resistance, inertia is little, and attraction can be ignored between the electric capacity two-plate, and the quality of pole plate can be very little, but if movable plate electrode itself just is made of tested conducting medium, then do not increase the quality and the inertia of movement parts at all.In addition, higher sensitivity is arranged.But, be to finish the sensing task singly by electric capacity, therefore, also need corresponding circuit to cooperate with it.
Summary of the invention
At above-mentioned technical problem, the purpose of this utility model provides a kind of differential pulse-width modulation circuit that is used to finish the sensing task that cooperates with electric capacity.
The technical scheme that realizes above-mentioned purpose is as follows:
Differential pulse-width modulation circuit, the in-phase input end of first comparator connects reference voltage, the inverting input of first comparator is connected with an end of first differential capacitor, the other end ground connection of first differential capacitor, the output of first comparator is connected with the first input end of a flip and flop generator, and first output of this flip and flop generator is connected to the tie point of first comparator and first differential capacitor; The in-phase input end of second comparator connects reference voltage, the inverting input of second comparator is connected with an end of second differential capacitor, the other end ground connection of second differential capacitor, the output of second comparator is connected with second input of described flip and flop generator, and second output of this flip and flop generator is connected to the tie point of second comparator and second differential capacitor.
Adopted such scheme, first output of flip and flop generator charges to first differential capacitor through first resistance, second output of flip and flop generator charges to second differential capacitor through second resistance, at first output is between high period, the voltage of first differential capacitor raises, and to be connected M place voltage rises to above reference voltage U
SThe time, first comparator produces pulse overturns flip and flop generator, and first output becomes low level, and second output of flip and flop generator becomes high level.At this moment the voltage on first differential capacitor is zero to approaching through first diode discharge, the high level of the second output end begins to charge to second differential capacitor, surpass reference voltage up to tie point N voltage, second comparator produces pulse overturns flip and flop generator again.So side face renews just exportable square wave between first output and second output.
Description of drawings
Fig. 1 is the structural representation in the utility model;
Embodiment
With reference to Fig. 1, differential pulse-width modulation circuit of the present utility model.The first differential capacitor C1 and the second differential capacitor C2 are tested differential capacitor.The in-phase input end of the first comparator A1 connects reference voltage U
SThe inverting input of the first comparator A1 is connected with the end of the first differential capacitor C1, the other end ground connection of first differential capacitor, the output of the first comparator A1 is connected with the first input end of a flip and flop generator K, and the first output Q1 of this flip and flop generator is connected to the tie point M of first comparator and first differential capacitor; The in-phase input end of the second comparator A2 connects reference voltage U
SThe inverting input of the second comparator A2 is connected with the end of the second differential capacitor C2, the other end ground connection of second differential capacitor, the output of second comparator is connected with second input of described flip and flop generator K, and the second output Q2 of this flip and flop generator is connected to the tie point N of second comparator and second differential capacitor.Be connected the two ends that 1, one first diode D1 of first resistance R is connected in parallel on first resistance R 1 between first output of flip and flop generator K and the first differential capacitor C1; Be connected the two ends that 2, one second diode D2 of second resistance R are connected in parallel on second resistance R 2 between second output of flip and flop generator K and the second differential capacitor C2.Connect a lead as exit from the first output Q1 of flip and flop generator, and the second output Q2 of flip and flop generator connects another lead as another exit, the voltage between these two exits is output voltage U
0
Claims (2)
1. differential pulse-width modulation circuit is characterized in that: the in-phase input end of first comparator (A1) connects reference voltage (U
S), the inverting input of first comparator (A1) is connected with an end of first differential capacitor (C1), the other end ground connection of first differential capacitor, the output of first comparator (A1) is connected with the first input end of a flip and flop generator (K), and first output of this flip and flop generator is connected to the tie point (M) of first comparator and first differential capacitor; The in-phase input end of second comparator (A2) connects reference voltage (U
S), the inverting input of second comparator (A2) is connected with an end of second differential capacitor (C2), the other end ground connection of second differential capacitor, the output of second comparator is connected with second input of described flip and flop generator (K), and second output of this flip and flop generator is connected to the tie point of second comparator and second differential capacitor.
2. differential pulse-width modulation circuit according to claim 1, it is characterized in that: be connected first resistance (R1) between first output of flip and flop generator (K) and first differential capacitor (C1), one first diode (D1) is connected in parallel on the two ends of first resistance (R1); Be connected second resistance (R2) between second output of flip and flop generator (K) and second differential capacitor (C2), one second diode (D2) is connected in parallel on the two ends of second resistance (R2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206017427U CN201854255U (en) | 2010-11-10 | 2010-11-10 | Differential pulse width modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206017427U CN201854255U (en) | 2010-11-10 | 2010-11-10 | Differential pulse width modulation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201854255U true CN201854255U (en) | 2011-06-01 |
Family
ID=44096635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206017427U Expired - Fee Related CN201854255U (en) | 2010-11-10 | 2010-11-10 | Differential pulse width modulation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201854255U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104713919A (en) * | 2015-03-04 | 2015-06-17 | 山东电力设备有限公司 | On-line detection device for micro-water content of SF6 gas in transformer bushing |
| CN108444436A (en) * | 2018-02-28 | 2018-08-24 | 西安交通大学 | A kind of hand gestures measuring system and method based on flexible large deformation sensor |
-
2010
- 2010-11-10 CN CN2010206017427U patent/CN201854255U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104713919A (en) * | 2015-03-04 | 2015-06-17 | 山东电力设备有限公司 | On-line detection device for micro-water content of SF6 gas in transformer bushing |
| CN108444436A (en) * | 2018-02-28 | 2018-08-24 | 西安交通大学 | A kind of hand gestures measuring system and method based on flexible large deformation sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110601 Termination date: 20111110 |