CN109032234A - The constant-current source device of voltage limit thresholding - Google Patents
The constant-current source device of voltage limit thresholding Download PDFInfo
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- CN109032234A CN109032234A CN201811166506.4A CN201811166506A CN109032234A CN 109032234 A CN109032234 A CN 109032234A CN 201811166506 A CN201811166506 A CN 201811166506A CN 109032234 A CN109032234 A CN 109032234A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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Abstract
The present invention discloses the constant-current source device of voltage limit thresholding, including operational amplifier N1, resistance R1, R2, R3, R4, R5, R6, capacitor C1, C2, C3, C4, triode V1, zener diode V2, PMOS tube V3, V4；Using operational amplifier as comparator, PMOS tube V4, zener diode V2, capacitor C4 and resistance R3 constitute pressure limiting breaking circuit, the setting of constant current source current numerical value is determined by two factors of input voltage Vi and sampling resistor R1, as long as guaranteeing that Vi and R1 is constant, electric current is with regard to constant, simple and flexible is set, accuracy is high, and reaction speed is fast；When the present apparatus connects load, due to there is overvoltage protection thresholding, overvoltage protection can be played to load, overvoltage is avoided to burn the load of connection；Present apparatus structure is simple, and cost is relatively low, is conducive to minimize.
Description
Technical field
The present invention relates to power circuit technical field, the constant-current source device of specifically a kind of voltage limit thresholding.
Background technique
Traditional constant-current source device is usually by current sampling circuit, feedback processor unit, and current control unit forms,
Often there is the disadvantages of structure is complicated, reaction speed is slow after process control, higher cost.Such as " constant-current source " (Authorization Notice No.
102723868 B of CN) patent just have that structure is complicated, the defect of higher cost；And " constant-current source " (application publication number CN
106936321 A) patent then have the defect that structure is complicated, reaction speed is slow, at high cost.
Summary of the invention
The purpose of the present invention is to provide the constant-current source device of voltage limit thresholding, the device is simple with structure, reaction is fast
Spend fast, at low cost and advantage with high accuracy.
The technical solution adopted by the present invention to solve the technical problems is:
The constant-current source device of voltage limit thresholding, including operational amplifier N1, resistance R1, R2, R3, R4, R5, R6, capacitor C1, C2,
C3, C4, triode V1, zener diode V2, PMOS tube V3, V4；
The power end connection working power of operational amplifier N1, the base stage of the output end connecting triode V1 of operational amplifier N1,
The non-inverting input terminal of the emitter of the inverting input terminal connecting triode V1 of operational amplifier N1, operational amplifier N1 connects resistance
As the input interface of constant-current source device after R2；Resistance R6 is connected in parallel on the both ends of resistance R2 after connecting with capacitor C2, resistance R6 with
The connection of capacitor C2 terminates GND；Capacitor C1 is connected between working power；
The emitter of triode V1 meets GND by resistance R1, and capacitor C3 is in parallel with resistance R1；The collector conduct of triode V1
The output end of constant-current source device negative voltage Vo-, while being connected to the cathode of zener diode V2；
The grid of the anode connection PMOS tube V4 of zener diode V2, the grid, another of one end connection PMOS tube V4 of resistance R3
The anode of end connection working power, capacitor C4 are in parallel with resistance R3；Resistance R4 and R5 are connected between working power, PMOS tube
The drain electrode of V4 is connected to the connecting pin of resistance R4 and R5, the anode of the source electrode connection working power of PMOS tube V4；
The grid of PMOS tube V3 is connected to the connecting pin of resistance R4 and R5, and the source electrode of PMOS tube V3 connects the anode of working power,
Output end of the drain electrode of PMOS tube V3 as constant-current source device positive voltage Vo+.
The invention has the advantages that using operational amplifier as comparator, constant current source current numerical value is set by inputting
Two factors of voltage Vi and sampling resistor R1 determine that, as long as guaranteeing that Vi and R1 is constant, electric current is constant, set simple and flexible, essence
Exactness is high, and reaction speed is fast；It, can be to having loaded overvoltage due to there is overvoltage protection thresholding when the present apparatus connects load
The effect of protection avoids overvoltage from burning the load of connection；Present apparatus structure is simple, and cost is relatively low, is conducive to minimize.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples:
Fig. 1 is circuit theory schematic diagram of the invention.
Specific embodiment
As shown in Figure 1, the present invention provide voltage limit thresholding constant-current source device, including operational amplifier N1, resistance R1,
R2, R3, R4, R5, R6, capacitor C1, C2, C3, C4, triode V1, zener diode V2, PMOS tube V3, V4.
The power end of operational amplifier N1 connects working power, the base of the output end connecting triode V1 of operational amplifier N1
Pole, the emitter of the inverting input terminal connecting triode V1 of operational amplifier N1, the non-inverting input terminal connection of operational amplifier N1
As the input interface of constant-current source device after resistance R2；Resistance R6 is connected in parallel on the both ends of resistance R2, resistance after connecting with capacitor C2
The connection of R6 and capacitor C2 terminates GND；Capacitor C1 is connected between working power.
The emitter of triode V1 meets GND by resistance R1, and capacitor C3 is in parallel with resistance R1；The collector of triode V1
As the output end of constant-current source device negative voltage Vo-, while being connected to the cathode of zener diode V2.
The grid of the anode connection PMOS tube V4 of zener diode V2, the grid of one end connection PMOS tube V4 of resistance R3,
The other end connects the anode of working power, and capacitor C4 is in parallel with resistance R3；Resistance R4 and R5 are connected between working power,
The drain electrode of PMOS tube V4 is connected to the connecting pin of resistance R4 and R5, the anode of the source electrode connection working power of PMOS tube V4.
The grid of PMOS tube V3 is connected to the connecting pin of resistance R4 and R5, and the source electrode connection working power of PMOS tube V3 is just
Pole, output end of the drain electrode of PMOS tube V3 as constant-current source device positive voltage Vo+.
When constant-current source device input terminal Vin inputs fixed voltage Vi, the output end driving triode of operational amplifier N1
V1 carries out Current amplifier, the current values I required for the electric current of amplification reachesSWhen=Vi/R1, ISElectric current is constant, reaches constant current
The purpose of application, the present embodiment limits Vi≤5V, then IS≤5V/R1.PMOS tube V4, zener diode V2, capacitor C4 and electricity
It hinders R3 and constitutes pressure limiting breaking circuit, pressure limiting breaking circuit, which is located at, is used as constant-current source device negative voltage Vo- output end and working power
Have between anode, the present embodiment working power is selected as 12V；The gate turn-on voltage for choosing PMOS tube V4 is V4TH, V4TH< 5V,
The pressure stabilizing value of voltage-stabiliser tube diode V2 is set to be equal to 5V-V simultaneously4TH, guarantee the electric current that flows through of zener diode V2 0.5mA~
The resistance value of resistance R3 is chosen in the range of 10mA.
The load current connected between the end Vo+ and the end Vo- is continuous current IS, voltage difference between the end Vo+ and the end Vo-
When rising to 5V or so, since the grid voltage of PMOS tube V4 reaches its gate turn-on voltage V4TH, PMOS tube V4 is opened, on R4
Voltage is reduced to zero, and PMOS tube V3 is disconnected, and the voltage between the end Vo+ and the end Vo- is reduced to zero, reaches permanent between the end Vo+ and the end Vo-
Stream and voltage limit thresholding 5V or so.
When constant current between the end Vo+ and the end Vo- and when voltage difference is less than 5V, since R4 and R5 is serially connected in working power 12V
Between, then choosing the resistance value of R4 and R5, guarantee that the voltage of R4 is greater than the unlatching thresholding V of PMOS tube V33TH, PMOS tube V3 is always
It opens, guarantees the normal function of constant-current source.Capacitor C4 and R3 can guarantee PMOS tube V3 turn-off delay.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form；Appoint
What those skilled in the art, without departing from the scope of the technical proposal of the invention, all using the side of the disclosure above
Method and technology contents make many possible changes and modifications to technical solution of the present invention, or are revised as the equivalent reality of equivalent variations
Apply example.Therefore, anything that does not depart from the technical scheme of the invention according to the technical essence of the invention do above embodiments
Any simple modification, equivalent replacement, equivalence changes and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (1)
1. the constant-current source device of voltage limit thresholding, which is characterized in that including operational amplifier N1, resistance R1, R2, R3, R4, R5,
R6, capacitor C1, C2, C3, C4, triode V1, zener diode V2, PMOS tube V3, V4；
The power end connection working power of operational amplifier N1, the base stage of the output end connecting triode V1 of operational amplifier N1,
The non-inverting input terminal of the emitter of the inverting input terminal connecting triode V1 of operational amplifier N1, operational amplifier N1 connects resistance
As the input interface of constant-current source device after R2；Resistance R6 is connected in parallel on the both ends of resistance R2 after connecting with capacitor C2, resistance R6 with
The connection of capacitor C2 terminates GND；Capacitor C1 is connected between working power；
The emitter of triode V1 meets GND by resistance R1, and capacitor C3 is in parallel with resistance R1；The collector conduct of triode V1
The output end of constant-current source device negative voltage Vo-, while being connected to the cathode of zener diode V2；
The grid of the anode connection PMOS tube V4 of zener diode V2, the grid, another of one end connection PMOS tube V4 of resistance R3
The anode of end connection working power, capacitor C4 are in parallel with resistance R3；Resistance R4 and R5 are connected between working power, PMOS tube
The drain electrode of V4 is connected to the connecting pin of resistance R4 and R5, the anode of the source electrode connection working power of PMOS tube V4；
The grid of PMOS tube V3 is connected to the connecting pin of resistance R4 and R5, and the source electrode of PMOS tube V3 connects the anode of working power,
Output end of the drain electrode of PMOS tube V3 as constant-current source device positive voltage Vo+.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811166506.4A CN109032234B (en) | 2018-10-08 | 2018-10-08 | Constant current source device for limiting voltage threshold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811166506.4A CN109032234B (en) | 2018-10-08 | 2018-10-08 | Constant current source device for limiting voltage threshold |
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| CN109032234A true CN109032234A (en) | 2018-12-18 |
| CN109032234B CN109032234B (en) | 2020-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669066A (en) * | 2019-01-25 | 2019-04-23 | 深圳市京泉华智能电气有限公司 | Current detecting comparison circuit |
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| KR20090082021A (en) * | 2008-01-25 | 2009-07-29 | 김용대 | Current Limit Circuit |
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| CN107172751A (en) * | 2017-06-12 | 2017-09-15 | 无锡职业技术学院 | A kind of adjustable LED control circuit of voltage and its control method |
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2018
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|---|---|---|---|---|
| KR20090082021A (en) * | 2008-01-25 | 2009-07-29 | 김용대 | Current Limit Circuit |
| CN101308172A (en) * | 2008-06-02 | 2008-11-19 | 杭州震古科技有限公司 | Current integration -type power detection device and power checking module |
| CN202815649U (en) * | 2012-10-24 | 2013-03-20 | 首都师范大学 | Two-terminal in-series type wide-voltage self-powered high-pressure high-power direct current adjustable current stabilizer |
| CN203707757U (en) * | 2013-12-20 | 2014-07-09 | Tcl通力电子（惠州）有限公司 | Overvoltage protection circuit and electronic equipment |
| CN105487588A (en) * | 2016-01-12 | 2016-04-13 | 四川长虹电器股份有限公司 | Constant current source circuit capable of being regulated and controlled in real time and constant current control method thereof |
| CN205901263U (en) * | 2016-08-24 | 2017-01-18 | 青岛歌尔声学科技有限公司 | Overvoltage crowbar and portable electronic products |
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| CN109669066A (en) * | 2019-01-25 | 2019-04-23 | 深圳市京泉华智能电气有限公司 | Current detecting comparison circuit |
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Address after: No. 2016, Tanghe Road, economic development zone, Bengbu City, Anhui Province 233000 Patentee after: Anhui North Microelectronics Research Institute Group Co.,Ltd. Address before: No. 2016, Tanghe Road, economic development zone, Bengbu City, Anhui Province 233000 Patentee before: NORTH ELECTRON RESEARCH INSTITUTE ANHUI Co.,Ltd. |
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