CN108923630A - A kind of circuit and automobile combination meter making capacitor repid discharge - Google Patents
A kind of circuit and automobile combination meter making capacitor repid discharge Download PDFInfo
- Publication number
- CN108923630A CN108923630A CN201810727943.2A CN201810727943A CN108923630A CN 108923630 A CN108923630 A CN 108923630A CN 201810727943 A CN201810727943 A CN 201810727943A CN 108923630 A CN108923630 A CN 108923630A
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- CN
- China
- Prior art keywords
- resistance
- capacitor
- power supply
- voltage comparator
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
Abstract
The invention discloses a kind of circuits for making capacitor repid discharge, discharge capacity one end hysteresis voltage comparator in the same direction in parallel, the noninverting input of voltage comparator connects the first power supply, the reverse input end of voltage comparator connects second source, the output end of voltage comparator connects the signal input part of discharge capacity by unidirectional conducting switch, the power supply power supply pin of voltage comparator connects second source, the ground connection input end grounding of voltage comparator.Using the technical solution, it can be achieved that repid discharge, discharge time are reduced to microsecond rank.
Description
Technical field
The present invention relates to circuit field, in particular to a kind of circuit and automobile combination meter for making capacitor repid discharge.
Background technique
Currently, some control pin input ends of chip can the company of being connected in parallel with a capacitor when being designed product using chip
It is connected to ground, to obtain correct timing control or original state setting after product powers on, as shown in Figure 1, PIN is chip
Pin is controlled, C1 is filtering or the delay capacitor of the pin, and OUT is the input control signal of the pin.
After product shutdown, if it is very slow to be not added the electric discharge of any measure capacitor, quick turn-on again after shutdown, since capacitor does not have also
Have enough time discharging, cause to control pin to be high level, so that mistake, product function failure occur for the control logic of chip.
If one resistance of parallel connection is connected to ground beside capacitor, if resistance value value is too using simple charging method
Greatly, then discharge time is too long, if resistance value value is too small, influences the input impedance of chip pin, be difficult to take one it is suitable
Resistance value, even if obtaining a moderate resistance value, although the discharge time of last capacitor than originally decreases, but the second
Grade, discharge time are still not ideal enough.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of circuit and automobile combination meter for making capacitor repid discharge, can make
The discharge time of discharge capacity is reduced to microsecond rank.
A kind of circuit making capacitor repid discharge provided in an embodiment of the present invention, discharge capacity one end hysteresis electricity in the same direction in parallel
Comparator is pressed, the noninverting input of voltage comparator connects the first power supply, the second electricity of reverse input end connection of voltage comparator
Source, the output end of voltage comparator connect the signal input part of discharge capacity, the electricity of voltage comparator by unidirectional conducting switch
Source energization pins connect second source, the ground connection input end grounding of voltage comparator.
Optionally, first power supply is the power supply input signal of product, and second source is DC power supply, works as product
Within the scope of the first operating supply voltage, the power supply of second source perseverance, when product shutdown, second source is slower than the first power supply power-fail.
Optionally, the hysteresis voltage comparator in the same direction further includes resistance R5, the resistance R5 connection noninverting input with
Output end is the feedback resistance of the voltage comparator output end.
Optionally, the hysteresis voltage comparator in the same direction further includes capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor
C2, capacitor C3 and capacitor C4 are the filter capacitor of the voltage comparator input terminal, and capacitor C5 is the voltage comparator power supply
The decoupling capacitor of input terminal.
Optionally, the hysteresis voltage comparator in the same direction further includes resistance R1, resistance R2, resistance R3, resistance R4, resistance R1
It is the divider resistance of the first power supply of power supply input signal with resistance R2, first power supply is defeated after resistance R1 and resistance R2 partial pressure
Enter the noninverting input to the voltage comparator, resistance R3 and resistance R4 are the divider resistance of second source, second source warp
Reference voltage after resistance R3 and resistance R4 partial pressure as the voltage comparator is input to reverse input end.
Optionally, the unidirectional conducting switch is diode, and the anode of the diode connects the letter of the discharge capacity
Number input terminal, the cathode of the diode connect the output end of the voltage comparator.
Optionally, the signal input part of the discharge capacity is also connected with the control pin and its control terminal of product chips.
In addition the present invention also provides a kind of automobile combination meter, design has as described above in the automobile combination meter
Capacitor quick discharging circuit.
Therefore pass through using the present embodiment technical solution since discharge capacity is using voltage comparator in the same direction in parallel
Actual measurement can make the discharge time of discharge capacity be reduced to microsecond rank.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is capacitor discharging circuit figure in the prior art；
Fig. 2 is a kind of circuit diagram for making capacitor repid discharge provided by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment：
The present embodiment provides a kind of circuit for making capacitor repid discharge, discharge capacity one end hysteresis voltage in the same direction in parallel compares
Device, the noninverting input of voltage comparator connect the first power supply, and the reverse input end of voltage comparator connects second source, voltage
The output end of comparator connects the signal input part of discharge capacity by unidirectional conducting switch, and the power supply power supply of voltage comparator is drawn
Foot connects second source, the ground connection input end grounding of voltage comparator.First power supply is that the power supply of product inputs letter
Number, second source is DC power supply, and when product is within the scope of the first operating supply voltage, second source perseverance is powered, when product closes
Second source is slower than the first power supply power-fail when machine.
It can be, but not limited to, as shown in Fig. 2, PIN is the control pin of chip IC, capacitor C1 is the electric discharge of the pin, filter
Wave or delay capacitor, OUT are the input control signal of the pin, and Control Circuit is that the control circuit of PIN (can be
Integrated circuit is also possible to the circuit of discrete component composition), capacitor C2, resistance R1, resistance R2, capacitor C3, resistance R3, resistance
R4, capacitor C4, capacitor C5, resistance R5 and voltage comparator U1 form hysteresis loop comparator in the same direction, and VL is hysteresis voltage comparator
Hysteresis voltage lower limit value, VH are hysteresis upper voltage limit, and the first power supply VCCA is power supply input signal (such as battery of product
Electrode line, a certain DC power supply in DC power supply or product after alternating current input rectifying), second source VCCB is
DC power supply, for permanent power supply, the second source when the first power supply VCCA remains unchanged in operating voltage range, and shuts down
VCCB is slower than the first power supply VCCA power down, and 1N1+ is the noninverting input of voltage comparator, and 1N1- is the reversed of voltage comparator
Input terminal, OUT1 are the output end of voltage comparator, and VCC is the power supply power supply pin of voltage comparator, and VSS is voltage comparator
Ground connection input terminal, capacitor C2, capacitor C3 and capacitor C4 be comparator input terminal filter capacitor, capacitor C5 be comparator power supply
The decoupling capacitor of input terminal, resistance R1 and resistance R2 are the divider resistance of the first power supply of power supply input signal VCCA, the first power supply
VCCA is input to the noninverting input of voltage comparator after resistance R1 and resistance R2 partial pressure, and resistance R3 and resistance R4 are the second electricity
The divider resistance of source VCCB, reference voltage of the second source VCCB after resistance R3 and resistance R4 partial pressure as voltage comparator are defeated
Enter to reverse input end, resistance R5 is the feedback resistance of voltage comparator output end, two pole of electric discharge of capacitor C1 when D1 is shutdown
Pipe.
Working principle is as follows：
When product is switched on for the first time, the first power supply VCCA and the second capacitor VCCB are successively powered on, and voltage comparator U1 starts
It works normally, if the voltage of voltage comparator reverse input end c point is Vc, the voltage of noninverting input b electricity is Vb, output end d
The voltage of point is Vd, and when Vb is greater than Vc, Vd is high level, then the input voltage of the first power supply VCCA is VH, that is, hysteresis electricity at this time
Upper limit value is pressed, Vd is fed back through resistance R5 to noninverting input Vb, increases the voltage of Vb, even if the electricity of the first power supply VCCA at this time
Pressure continues to increase, and the output state of voltage comparator will not change, i.e., Vd remains high level.Due to the isolation of diode D1
Effect, when Vd is high level, the Va voltage of the control pin PIN input terminal a point of chip IC is only by control circuit Control
When the control of the output signal OUT of Circuit, i.e. OUT signal are high level, Va is also high level, when OUT signal is low level
When, Va is also low level.
When product shutdown, the voltage of the first power supply VCCA of input is gradually decreased, and Vb voltage also decreases, because second
Power supply VCCB is slower than the first power supply VCCA power down, and resistance R2, resistance R3, resistance R4 and resistance R5 are taken suitable resistance value, made
Vb voltage ratio Vc voltage change obtains faster when obtaining power down, then when the input voltage of the first power supply VCCA is less than the lower limit of hysteresis voltage
When value VL, that is, voltage of Vb is when being less than the voltage of Vc, Vd exports low level, and Va ratio Vd is big at this time, and the charge of capacitor C1 storage passes through
Diode D1 repid discharge, discharge time are microsecond ranks.
It can be, but not limited to, capacitor quick discharging circuit is suitable for automobile combination meter or other electronics in the application
In circuit arrangement.
Therefore putting for discharge capacity can be made by actual measurement using voltage comparator in the same direction in parallel using discharge capacity
The electric time is reduced to microsecond rank, realizes repid discharge.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (8)
1. a kind of circuit for making capacitor repid discharge, which is characterized in that discharge capacity one end hysteresis voltage comparator in the same direction in parallel,
The noninverting input of voltage comparator connects the first power supply, and the reverse input end of voltage comparator connects second source, voltage ratio
Compared with device output end by unidirectional conducting switch connect discharge capacity signal input part, the power supply power supply pin of voltage comparator
Connect second source, the ground connection input end grounding of voltage comparator.
2. a kind of circuit for making capacitor repid discharge as described in claim 1, which is characterized in that first power supply is product
Power supply input signal, second source is DC power supply, when product is within the scope of the first operating supply voltage, second source
Perseverance power supply, when product shutdown, second source is slower than the first power supply power-fail.
3. a kind of circuit for making capacitor repid discharge as claimed in claim 2, which is characterized in that the hysteresis voltage ratio in the same direction
It further include resistance R5 compared with device, the resistance R5 connection noninverting input is the feedback of the voltage comparator output end with output end
Resistance.
4. a kind of circuit for making capacitor repid discharge as claimed in claim 3, which is characterized in that the hysteresis voltage ratio in the same direction
It further include capacitor C2, capacitor C3, capacitor C4, capacitor C5 compared with device, capacitor C2, capacitor C3 and capacitor C4 are that the voltage comparator is defeated
Enter the filter capacitor at end, capacitor C5 is the decoupling capacitor of the voltage comparator power input.
5. a kind of circuit for making capacitor repid discharge as claimed in claim 4, which is characterized in that the hysteresis voltage ratio in the same direction
It further include resistance R1, resistance R2, resistance R3, resistance R4 compared with device, resistance R1 and resistance R2 are the first power supply of power supply input signal
Divider resistance, first power supply are input to the noninverting input of the voltage comparator after resistance R1 and resistance R2 partial pressure,
Resistance R3 and resistance R4 is the divider resistance of second source, and second source is used as the voltage after resistance R3 and resistance R4 partial pressure
The reference voltage of comparator is input to reverse input end.
6. a kind of circuit for making capacitor repid discharge as claimed in claim 5, which is characterized in that the unidirectional conducting switch is
Diode, the anode of the diode connect the signal input part of the discharge capacity, described in the cathode connection of the diode
The output end of voltage comparator.
7. a kind of circuit for making capacitor repid discharge as claimed in claim 6, which is characterized in that the signal of the discharge capacity
Input terminal is also connected with the control pin and its control terminal of product chips.
8. a kind of automobile combination meter, which is characterized in that design is appointed just like in claim 1 to 7 in the automobile combination meter
Capacitor quick discharging circuit described in one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810727943.2A CN108923630A (en) | 2018-07-05 | 2018-07-05 | A kind of circuit and automobile combination meter making capacitor repid discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810727943.2A CN108923630A (en) | 2018-07-05 | 2018-07-05 | A kind of circuit and automobile combination meter making capacitor repid discharge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108923630A true CN108923630A (en) | 2018-11-30 |
Family
ID=64424116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810727943.2A Pending CN108923630A (en) | 2018-07-05 | 2018-07-05 | A kind of circuit and automobile combination meter making capacitor repid discharge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108923630A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594111A (en) * | 2012-02-24 | 2012-07-18 | 中兴通讯股份有限公司 | Quick discharge circuit |
| CN106134502B (en) * | 2009-08-20 | 2013-01-23 | 北京卫星制造厂 | A kind of solar cell divides battle array parallel regulator |
| EP2608389A1 (en) * | 2011-12-19 | 2013-06-26 | Siemens Aktiengesellschaft | Modular Multilevel DC/AC converter comprising a series connection of DC/AC inverter sub-modules with a central discharge apparatus |
| CN103595473A (en) * | 2013-06-04 | 2014-02-19 | 青岛海信宽带多媒体技术有限公司 | Burst mode reception control circuit and burst mode light receiver |
-
2018
- 2018-07-05 CN CN201810727943.2A patent/CN108923630A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106134502B (en) * | 2009-08-20 | 2013-01-23 | 北京卫星制造厂 | A kind of solar cell divides battle array parallel regulator |
| EP2608389A1 (en) * | 2011-12-19 | 2013-06-26 | Siemens Aktiengesellschaft | Modular Multilevel DC/AC converter comprising a series connection of DC/AC inverter sub-modules with a central discharge apparatus |
| CN102594111A (en) * | 2012-02-24 | 2012-07-18 | 中兴通讯股份有限公司 | Quick discharge circuit |
| CN103595473A (en) * | 2013-06-04 | 2014-02-19 | 青岛海信宽带多媒体技术有限公司 | Burst mode reception control circuit and burst mode light receiver |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181130 |