CN104656728A - Negative voltage constant current source circuit - Google Patents
Negative voltage constant current source circuit Download PDFInfo
- Publication number
- CN104656728A CN104656728A CN201310575244.8A CN201310575244A CN104656728A CN 104656728 A CN104656728 A CN 104656728A CN 201310575244 A CN201310575244 A CN 201310575244A CN 104656728 A CN104656728 A CN 104656728A
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- Prior art keywords
- current source
- power mos
- triode
- negative voltage
- source circuit
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Abstract
The invention provides a negative voltage constant current source circuit, and belongs to the technical field of electronic circuit design, and specifically provides an operation amplifier, a load resistor, a high power MOS transistor, a triode, a bleeder resistor, and a filter capacitor, wherein an inverting end of the operation amplifier is connected with an input voltage; the output of the operation amplifier is connected with the G pole of the MOS transistor; the S pole of the high power MOS transistor is connected with a negative voltage via the bleeder resistor, and concurrently connected with a base electrode of the triode; an emitting electrode of the triode is connected with the negative voltage; the D pole of the high power MOS transistor is connected with a collecting electrode of the triode, and is grounded via the load resistor; the negative voltage constant current source circuit solves the problem of no positive reference voltage system in a constant current source circuit; the constant current can be generated without using the DC-DC technology to invert the power source; the negative voltage constant current source circuit has the advantages of simple circuit, less elements, large current dynamic range, strong drive ability, and programmable and fixable load current.
Description
Technical field
The invention belongs to design of electronic circuits technical field, be 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 system, 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 to provide reference voltage; But some occasion is with in application, because system does not have forward voltage only to have negative voltage, or pcb board space is inadequate, and be not easy to do voltage transformation, now traditional constant-current source circuit all cannot work, and cannot provide steady current for load.
Summary of the invention
The object of the invention is to overcome the problem that cannot produce constant current source in prior art by negative pressure, only negative-pressure design tabilized current power supply in employing system.
For this reason, the invention 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 exports and 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, and use high-power MOS tube, its conducting resistance is milliohm level only, the little heating radiator without the need to bulky of circuit loss.
Filter capacitor described above is connected to operational amplifier and exports between high-power MOS tube S level, and filtering pink noise, prevents circuit from shaking.
Beneficial effect of the present invention: this kind of negative pressure constant-current source circuit provided by the invention, 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 exports and 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 solves the problem without reference voltage system constant-current source circuit, without the need to using DC-DC technology that power supply is anti-phase, just steady current can be produced, there is circuit simple, element is less, current dynamic range is large, driving force is strong, the program-controlled also fixable feature of load current.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of negative pressure constant-current source circuit of the present invention.
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:
Present embodiments provide a kind of negative pressure constant-current source circuit shown in a kind of Fig. 1, 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 exports and is connected with high-power MOS tube 3G level, high-power MOS tube 3S 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 3D level is connected with triode 4 collector, 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 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, and use high-power MOS tube 3, its conducting resistance is milliohm level only, the little heating radiator without the need to bulky of circuit loss.
Adopt Darlington transistor triode 4 and high-power MOS tube 3 parallel connection as the switched linear device of system, increase system output current dynamic range, load driving force is strengthened.
Embodiment 3:
Filter capacitor 6 is connected to operational amplifier 1 and exports between high-power MOS tube 3S level as shown in Figure 1, and filtering pink noise, prevents circuit from shaking.
Adopt point to separate electric capacity as filter capacitor 6, not only cost is low, also improves the reliability of system, is that system has more excellent performance.
More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
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) exports and 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 to operational amplifier (1) and exports between high-power MOS tube (3) S level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310575244.8A CN104656728A (en) | 2013-11-18 | 2013-11-18 | Negative voltage constant current source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310575244.8A CN104656728A (en) | 2013-11-18 | 2013-11-18 | Negative voltage constant current source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104656728A true CN104656728A (en) | 2015-05-27 |
Family
ID=53247985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310575244.8A Withdrawn CN104656728A (en) | 2013-11-18 | 2013-11-18 | Negative voltage constant current source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104656728A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI674492B (en) * | 2018-07-13 | 2019-10-11 | 大陸商昂寶電子（上海）有限公司 | Linear constant current circuit |
| CN113110677A (en) * | 2021-05-27 | 2021-07-13 | 广东工业大学 | Low-power-consumption negative pressure generator for radio frequency switch |
| CN116338509A (en) * | 2023-03-20 | 2023-06-27 | 武汉芯必达微电子有限公司 | Test method and test circuit for rapidly-changing power supply signal |
-
2013
- 2013-11-18 CN CN201310575244.8A patent/CN104656728A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI674492B (en) * | 2018-07-13 | 2019-10-11 | 大陸商昂寶電子（上海）有限公司 | Linear constant current circuit |
| CN113110677A (en) * | 2021-05-27 | 2021-07-13 | 广东工业大学 | Low-power-consumption negative pressure generator for radio frequency switch |
| CN113110677B (en) * | 2021-05-27 | 2022-05-27 | 广东工业大学 | Low-power-consumption negative pressure generator for radio frequency switch |
| US11711075B2 (en) | 2021-05-27 | 2023-07-25 | Guangdong University Of Technology | Low-power consumption negative voltage generator for radio frequency switches |
| CN116338509A (en) * | 2023-03-20 | 2023-06-27 | 武汉芯必达微电子有限公司 | Test method and test circuit for rapidly-changing power supply signal |
| CN116338509B (en) * | 2023-03-20 | 2023-08-29 | 武汉芯必达微电子有限公司 | Test method and test circuit for rapidly-changing power supply signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20150527 |