CN203773393U - Negative-voltage constant current source circuit - Google Patents
Negative-voltage constant current source circuit Download PDFInfo
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- CN203773393U CN203773393U CN201320726274.XU CN201320726274U CN203773393U CN 203773393 U CN203773393 U CN 203773393U CN 201320726274 U CN201320726274 U CN 201320726274U CN 203773393 U CN203773393 U CN 203773393U
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- mos tube
- power mos
- current source
- triode
- negative
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Abstract
The utility model discloses a negative-voltage constant current source circuit, and belongs to the technical field of electronic circuit design. The negative-voltage constant current source circuit specifically comprises an operational amplifier, a load resistor, a high power MOS tube, a triode, a bleeder resistor and a filter capacitor, wherein the inversed phase end of the operational amplifier is connected with an input voltage, the output of the operational amplifier is connected with the gate of the high power MOS tube, the source of the high power MOS tube is connected with a negative voltage through the bleeder resistor and connected to the base of the triode at the same time, the emitter of the triode is connected with the negative voltage, and the drain of the high-power MOS tube is connected with the collector of the triode and connected to the ground through the load resistor. The problem of a constant current source circuit of a system without a positive reference voltage is solved, the constant current can be generated without inverting phases of a power source with the DC-DC technology, and the negative-voltage constant current source circuit has the advantages that the circuit is simple, elements are fewer, a current dynamic range is wide, the driving capacity is high, and a load current can be controlled in a programmable mode and can also be fixed.
Description
Technical field
The utility model belongs to design of electronic circuits technical field, is specifically related to a kind of negative pressure constant-current source circuit.
Background technology
At present, constant current source is used widely in the industries such as photoelectricity, control, robot, communication, medical treatment, it is requisite ingredient in a lot of electronic systems, traditional constant current source has two kinds, a kind of is positive voltage Linear CCS based on amplifier and switching tube, another kind is DC-DC switch constant-current source, but the two all needs system that reference voltage is provided; But in some occasion and application, only have negative voltage, or pcb board space is inadequate, is not easy to do voltage transformation because system does not have forward voltage, now traditional constant-current source circuit all cannot be worked, and cannot provide steady current for load.
Summary of the invention
The purpose of this utility model is to overcome the problem that cannot produce by negative pressure constant current source in prior art, only negative-pressure design adjustable constant-flow source in employing system.
For this reason, the utility model provides a kind of negative pressure constant-current source circuit, comprising: operational amplifier, pull-up resistor, high-power MOS tube, triode, bleeder resistance, filter capacitor; The wherein anti-phase termination input voltage of operational amplifier, operational amplifier output is connected with high-power MOS tube G level, high-power MOS tube S level connects negative voltage by bleeder resistance, and be connected to transistor base simultaneously, triode is penetrated level and is connected with negative voltage, high-power MOS tube D level is connected with transistor collector, and is connected to ground by pull-up resistor.
High-power MOS tube D level described above and operational amplifier in-phase end connect and compose feedback, make system stability work, realize constant current, use high-power MOS tube, and its conducting resistance is milliohm level only, the little heating radiator without bulky of circuit loss.
Filter capacitor described above is connected between operational amplifier output and high-power MOS tube S level, and filtering pink noise prevents circuit concussion.
The beneficial effects of the utility model: this kind of negative pressure constant-current source circuit that the utility model provides, comprising: operational amplifier, pull-up resistor, high-power MOS tube, triode, bleeder resistance, filter capacitor, the wherein anti-phase termination input voltage of operational amplifier, operational amplifier output is connected with high-power MOS tube G level, high-power MOS tube S level connects negative voltage by bleeder resistance, and be connected to transistor base simultaneously, triode is penetrated level and is connected with negative voltage, high-power MOS tube D level is connected with transistor collector, and be connected to ground by pull-up resistor, therefore, this a kind of negative pressure constant-current source circuit has solved the problem without reference voltage system constant-current source circuit, without using, DC-DC technology is anti-phase by power supply, just can produce steady current, there is circuit simple, element is less, electric current dynamic range is large, driving force is strong, the program-controlled also fixable feature of load current.
Brief description of the drawings
Fig. 1 is the schematic diagram of a kind of negative pressure constant-current source circuit of the utility model.
Description of reference numerals: 1, operational amplifier; 2, pull-up resistor; 3, high-power MOS tube; 4, triode; 5, bleeder resistance; 6, filter capacitor.
Embodiment
Embodiment 1:
The present embodiment provides a kind of negative pressure constant-current source circuit shown in a kind of Fig. 1, comprises operational amplifier 1, pull-up resistor 2, high-power MOS tube 3, triode 4, bleeder resistance 5, filter capacitor 6; The wherein anti-phase termination input voltage of operational amplifier 1, operational amplifier 1 is exported with high-power MOS tube 3G level and is connected, high-power MOS tube 3S level connects negative voltage by bleeder resistance 5, and be connected to triode 4 base stages simultaneously, triode 4 is penetrated level and is connected with negative voltage, high-power MOS tube 3D level is connected with triode 4 collectors, and is connected to ground by pull-up resistor 2.Utilize negative voltage just can produce steady current, have circuit simple, element is less, and electric current dynamic range is large, and driving force is strong, the program-controlled also fixable feature of load current.
Embodiment 2:
High-power MOS tube 3D level and operational amplifier 1 in-phase end connect and compose feedback as shown in Figure 1, make system stability work, realize constant current, use high-power MOS tube 3, and its conducting resistance is milliohm level only, the little heating radiator without bulky of circuit loss.
Adopt Darlington transistor triode 4 and high-power MOS tube 3 parallel connections as the switched linear device of system, increased system output current dynamic range, load driving force is strengthened.
Embodiment 3:
As shown in Figure 1 filter capacitor 6 be connected in that operational amplifier 1 is exported and high-power MOS tube 3S level between, filtering pink noise, prevents circuit concussion.
Adopt point to separate electric capacity as filter capacitor 6, not only cost is low, has also improved the reliability of system, is that system has more excellent performance.
More than exemplifying is only to illustrate of the present utility model, does not form the restriction to protection domain of the present utility model, within the every and same or analogous design of the utility model all belongs to protection domain of the present utility model.
Claims (3)
1. a negative pressure constant-current source circuit, is characterized in that: comprise operational amplifier (1), pull-up resistor (2), high-power MOS tube (3), triode (4), bleeder resistance (5), filter capacitor (6); The wherein anti-phase termination input voltage of operational amplifier (1), operational amplifier (1) output is connected with high-power MOS tube (3) G level, high-power MOS tube (3) S level connects negative voltage by bleeder resistance (5), and be connected to triode (4) base stage simultaneously, triode (4) is penetrated level and is connected with negative voltage, high-power MOS tube (3) D level is connected with triode (4) collector, and is connected to ground by pull-up resistor (2).
2. a kind of negative pressure constant-current source circuit as claimed in claim 1, is characterized in that: described high-power MOS tube (3) D level and operational amplifier (1) in-phase end connect and compose feedback.
3. a kind of negative pressure constant-current source circuit as claimed in claim 1, is characterized in that: described filter capacitor (6) is connected between operational amplifier (1) output and high-power MOS tube (3) S level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320726274.XU CN203773393U (en) | 2013-11-18 | 2013-11-18 | Negative-voltage constant current source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320726274.XU CN203773393U (en) | 2013-11-18 | 2013-11-18 | Negative-voltage constant current source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203773393U true CN203773393U (en) | 2014-08-13 |
Family
ID=51290561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320726274.XU Expired - Fee Related CN203773393U (en) | 2013-11-18 | 2013-11-18 | Negative-voltage constant current source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203773393U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444912A (en) * | 2015-11-05 | 2016-03-30 | 纳米及先进材料研发院有限公司 | Temperature sensor used for tracking body temperatures based on printable nanometer material thermal resistor |
| CN107256056A (en) * | 2017-07-05 | 2017-10-17 | 佛山杰致信息科技有限公司 | The low-voltage circuit of power distribution cabinet |
| CN113109790A (en) * | 2021-04-14 | 2021-07-13 | 深圳煜炜光学科技有限公司 | Method and device for measuring flight time of laser radar |
-
2013
- 2013-11-18 CN CN201320726274.XU patent/CN203773393U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444912A (en) * | 2015-11-05 | 2016-03-30 | 纳米及先进材料研发院有限公司 | Temperature sensor used for tracking body temperatures based on printable nanometer material thermal resistor |
| US10034609B2 (en) | 2015-11-05 | 2018-07-31 | Nano And Advanced Materials Institute Limited | Temperature sensor for tracking body temperature based on printable nanomaterial thermistor |
| CN107256056A (en) * | 2017-07-05 | 2017-10-17 | 佛山杰致信息科技有限公司 | The low-voltage circuit of power distribution cabinet |
| CN113109790A (en) * | 2021-04-14 | 2021-07-13 | 深圳煜炜光学科技有限公司 | Method and device for measuring flight time of laser radar |
| CN113109790B (en) * | 2021-04-14 | 2022-04-12 | 深圳煜炜光学科技有限公司 | Method and device for measuring flight time of laser radar |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20141118 |
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| EXPY | Termination of patent right or utility model |