CN102081420A - Current limiting regulated power supply with high precision - Google Patents
Current limiting regulated power supply with high precision Download PDFInfo
- Publication number
- CN102081420A CN102081420A CN 200910253648 CN200910253648A CN102081420A CN 102081420 A CN102081420 A CN 102081420A CN 200910253648 CN200910253648 CN 200910253648 CN 200910253648 A CN200910253648 A CN 200910253648A CN 102081420 A CN102081420 A CN 102081420A
- Authority
- CN
- China
- Prior art keywords
- triode
- resistor
- current limliting
- difference
- voltage stabilizing
- 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.)
- Granted
Links
Images
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a current limiting regulated power supply with high precision. A power supply circuit is internally provided with a voltage-stabilizing differential triode pair, a current limiting differential triode pair, two adjustment amplifying triodes, a feedback resistor network, a current limiting reference voltage circuit and a current detecting resistor, wherein when the voltage of the current detecting resistor is not less than that of the current limiting reference voltage circuit, the current limiting differential triode at the right side of the current limiting difference triode pair is conducted, the base current of each adjustment amplifying triode is restricted, and the circuit output current is restricted. The voltage-stabilizing differential triode pair and the current limiting differential triode pair have temperature drift rejection characteristics, so the circuit output voltage and the circuit limiting current all have high stability. The limiting current value can be adjusted and output through changing the resistance value of the current detecting resistor.
Description
Technical field
The present invention relates to electricity field, relate in particular to electrical apparatus for vehicle use, particularly a kind of high precision current limliting stabilized voltage supply.
Background technology
In the prior art, the number of applications of electronic equipment is more and more in the automobile, all uses voltage-stabilized power supply circuit.Wherein the power supply that provides to outside modular circuit of ECU not only needs voltage stabilizing, and needs high-precision current limliting with holding circuit.Current limliting voltage-stabilized power supply circuit commonly used at present has following several:
1. provide the voltage of voltage regulation source with power supply chip.Though this scheme circuit is simple, the cost height, and the current limliting precision is low, and be difficult for changing according to designing requirement.
2. power supply chip adds the operational amplifier feedback.Though 1. this scheme alternative has improved the current limliting precision, cost is higher, and this has limited its widespread use in the automotive electronics circuit.
3. power supply chip is in conjunction with using triode as the Current limited Control element.The resistance both end voltage that this circuit will be connected on the power lead adds to the triode be utmost point, again in conjunction with other control circuits, reaches the purpose of Current limited Control.But the variation that the Vbe of triode is bigger along with variation of temperature has, the cut-off current that makes this circuit is along with big change takes place in temperature fluctuation.
Summary of the invention:
The object of the present invention is to provide a kind of high precision current limliting stabilized voltage supply, described this high precision current limliting stabilized voltage supply will solve current limliting voltage-stabilized power supply circuit or cost height in the prior art, perhaps low the or technical matters that is not easy to regulate of current limliting precision.
This high precision current limliting stabilized voltage supply of the present invention is right by a voltage stabilizing difference triode, a current limliting difference triode is right, adjust amplifying triode for one first, adjust amplifying triode for one second, a feedback resistive network, a current limliting reference voltage circuit and a current sensing resistor constitute, described voltage stabilizing difference triode centering includes a left side voltage stabilizing difference triode and a right side voltage stabilizing difference triode, described current limliting difference triode centering includes a left side current limliting difference triode and a right side current limliting difference triode, wherein, described current limliting reference voltage circuit is by a voltage stabilizing diode, one first resistor and one second resistor constitute, one end of described first resistor is connected with an end of described voltage stabilizing diode, the other end of first resistor is connected with an end of described second resistor, the other end of second resistor is connected with the other end of voltage stabilizing diode, the tie point of first resistor and second resistor is connected with the base stage of described left side current limliting difference triode, the emitter of left side current limliting difference triode is connected with the emitter of described right side current limliting difference triode, the grounded collector of left side current limliting difference triode, the emitter of left side current limliting difference triode, the emitter of right side current limliting difference triode all is connected with the tie point of voltage stabilizing diode with first resistor, the tie point ground connection of the voltage stabilizing diode and second resistor, described feedback resistive network is made up of one first feedback resistor and one second feedback resistor, the base stage of right side current limliting difference triode through behind described first feedback resistor with an end of described current sensing resistor, described first emitter of adjusting amplifying triode connects, the other end of current sensing resistor is connected with the emitter of left side current limliting difference triode, first adjusts the base stage of amplifying triode and the collector of right side current limliting difference triode, the collector of left side voltage stabilizing difference triode connects, first collector of adjusting amplifying triode is connected with described second base stage of adjusting amplifying triode, second collector and first of adjusting amplifying triode is adjusted the emitter of amplifying triode, the collector of right side voltage stabilizing difference triode connects, second emitter of adjusting amplifying triode is connected through ground connection behind described second feedback resistor and with the base stage of right side voltage stabilizing difference triode, the emitter of right side voltage stabilizing difference triode is connected with the emitter of left side voltage stabilizing difference triode, and the base stage of left side voltage stabilizing difference triode is connected with voltage input end.
Further, described current sensing resistor is adjustable resistance resistors.
Principle of work of the present invention is: when the voltage on the current sensing resistor during more than or equal to the current limliting reference voltage, right side current limliting difference triode conducting, first base current of adjusting amplifying triode is restricted, and the circuit output current is limited.Voltage stabilizing difference triode to, current limliting difference triode to having the temperature drift rejection characteristic, so the output voltage of circuit and cut-off current all have very high stability.The resistance of change current sensing resistor can be adjusted the output current limiting value.
The present invention and prior art are compared, and its technique effect is actively with tangible.The present invention in power circuit, be provided with voltage stabilizing difference triode to, current limliting difference triode to, two adjust amplifying triodes, a feedback resistive network, a current limliting reference voltage circuit and a current sensing resistor, voltage on the current sensing resistor is during more than or equal to the voltage of current limliting reference voltage circuit, the current limliting difference triode conducting of current limliting difference triode centering right side, the base current of adjusting amplifying triode is restricted, and the circuit output current is limited.Voltage stabilizing difference triode to, current limliting difference triode to having the temperature drift rejection characteristic, so the output voltage of circuit and cut-off current all have very high stability.The resistance of change current sensing resistor can be adjusted the output current limiting value.
Description of drawings:
Fig. 1 is the schematic diagram of a kind of high precision current limliting stabilized voltage supply of the present invention.
Fig. 2 is the schematic diagram of an embodiment of a kind of high precision current limliting stabilized voltage supply of the present invention.
Embodiment:
As shown in Figure 1, a kind of high precision current limliting stabilized voltage supply of the present invention, by a voltage stabilizing difference triode to Q2, a current limliting difference triode is to Q1, adjust amplifying triode Q4 for one first, adjust amplifying triode Q3 for one second, a feedback resistive network, a current limliting reference voltage circuit and a current sensing resistor R14 constitute, described voltage stabilizing difference triode is to including a left side voltage stabilizing difference triode and a right side voltage stabilizing difference triode among the Q2, described current limliting difference triode is to including a left side current limliting difference triode and a right side current limliting difference triode among the Q1, wherein, described current limliting reference voltage circuit is by a voltage stabilizing diode Z1, one first resistor R 5 and one second resistor R 3 constitute, one end of described first resistor R 5 is connected with the end of described voltage stabilizing diode Z1, the other end of first resistor R 5 is connected with an end of described second resistor R 3, the other end of second resistor R 3 is connected with the other end of voltage stabilizing diode Z1, the tie point of first resistor R 5 and second resistor R 3 is connected with the base stage of described left side current limliting difference triode, the emitter of left side current limliting difference triode is connected with the emitter of described right side current limliting difference triode, the grounded collector of left side current limliting difference triode, the emitter of left side current limliting difference triode, the emitter of right side current limliting difference triode all is connected with the tie point of first resistor R 5 with voltage stabilizing diode Z1, the tie point ground connection of the voltage stabilizing diode Z1 and second resistor R 3, described feedback resistive network is made up of one first feedback resistor R2 and one second feedback resistor R1, the base stage of right side current limliting difference triode through behind the described first feedback resistor R2 with the end of described current sensing resistor R14, described first emitter of adjusting amplifying triode Q4 connects, the other end of current sensing resistor R14 is connected with the emitter of left side current limliting difference triode, first adjusts the base stage of amplifying triode Q4 and the collector of right side current limliting difference triode, the collector of left side voltage stabilizing difference triode connects, first collector of adjusting amplifying triode Q4 is connected with described second base stage of adjusting amplifying triode Q3, second collector and first of adjusting amplifying triode Q3 is adjusted the emitter of amplifying triode Q4, the collector of right side voltage stabilizing difference triode connects, second emitter of adjusting amplifying triode Q3 is connected through ground connection behind the described second feedback resistor R1 and with the base stage of right side voltage stabilizing difference triode, the emitter of right side voltage stabilizing difference triode is connected with the emitter of left side voltage stabilizing difference triode, and the base stage of left side voltage stabilizing difference triode is connected with voltage input end Vref.
Further, described current sensing resistor R14 is adjustable resistance resistors.
Principle of work of the present invention is: Q2 is the voltage stabilizing differential pair, and Q4 and Q3 are for adjusting amplifier tube, and R1 and R2 are feedback resistive network, and its output voltage is Vout=(1+R1/R9) * Vref.Q1 is the current limliting differential pair, and Z1, R5, R3 constitute the current limliting reference voltage, and R14 is a current sense resistor.When the voltage on the R14 during more than or equal to the current limliting reference voltage, the triode conducting of Q1 right side, the base current of adjusting pipe Q4 is restricted, and the circuit output current is limited in Iout=Vz1* (1+R3/R5)/R14.The differential pair tube that constitutes because of Q1 and Q2 has very strong temperature and floats rejection characteristic, so output voltage of this circuit and cut-off current all have very high stability.Change R14 can adjust the output current limiting value easily.
As shown in Figure 2, Vref is input as the I/O output of MCU1, is output as 2 power supplies of ECU external module.Unusual when the external loading appearance, when being reduced to a certain degree as resistance, current-limiting circuit is started working, and electric current can further not increased.When the load resistance further reduced, output voltage reduced, and when the ADC of MCU1 monitored electric voltage exception, holding circuit was unlikely to damage thereby shutoff Vref turn-offs the output of this power supply.
Above design example only be a preferred embodiment among the present invention, other should be contained in the protection domain of present patent application according to design circuit of the present invention or the design that derives.
Claims (2)
1. high precision current limliting stabilized voltage supply, right by a voltage stabilizing difference triode, a current limliting difference triode is right, adjust amplifying triode for one first, adjust amplifying triode for one second, a feedback resistive network, a current limliting reference voltage circuit and a current sensing resistor constitute, described voltage stabilizing difference triode centering includes a left side voltage stabilizing difference triode and a right side voltage stabilizing difference triode, described current limliting difference triode centering includes a left side current limliting difference triode and a right side current limliting difference triode, it is characterized in that: described current limliting reference voltage circuit is by a voltage stabilizing diode, one first resistor and one second resistor constitute, one end of described first resistor is connected with an end of described voltage stabilizing diode, the other end of first resistor is connected with an end of described second resistor, the other end of second resistor is connected with the other end of voltage stabilizing diode, the tie point of first resistor and second resistor is connected with the base stage of described left side current limliting difference triode, the emitter of left side current limliting difference triode is connected with the emitter of described right side current limliting difference triode, the grounded collector of left side current limliting difference triode, the emitter of left side current limliting difference triode, the emitter of right side current limliting difference triode all is connected with the tie point of voltage stabilizing diode with first resistor, the tie point ground connection of the voltage stabilizing diode and second resistor, described feedback resistive network is made up of one first feedback resistor and one second feedback resistor, the base stage of right side current limliting difference triode through behind described first feedback resistor with an end of described current sensing resistor, described first emitter of adjusting amplifying triode connects, the other end of current sensing resistor is connected with the emitter of left side current limliting difference triode, first adjusts the base stage of amplifying triode and the collector of right side current limliting difference triode, the collector of left side voltage stabilizing difference triode connects, first collector of adjusting amplifying triode is connected with described second base stage of adjusting amplifying triode, second collector and first of adjusting amplifying triode is adjusted the emitter of amplifying triode, the collector of right side voltage stabilizing difference triode connects, second emitter of adjusting amplifying triode is connected through ground connection behind described second feedback resistor and with the base stage of right side voltage stabilizing difference triode, the emitter of right side voltage stabilizing difference triode is connected with the emitter of left side voltage stabilizing difference triode, and the base stage of left side voltage stabilizing difference triode is connected with voltage input end.
2. a kind of high precision current limliting stabilized voltage supply as claimed in claim 1, it is characterized in that: described current sensing resistor is adjustable resistance resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910253648 CN102081420B (en) | 2009-12-01 | 2009-12-01 | Current limiting regulated power supply with high precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910253648 CN102081420B (en) | 2009-12-01 | 2009-12-01 | Current limiting regulated power supply with high precision |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102081420A true CN102081420A (en) | 2011-06-01 |
| CN102081420B CN102081420B (en) | 2013-06-19 |
Family
ID=44087420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910253648 Expired - Fee Related CN102081420B (en) | 2009-12-01 | 2009-12-01 | Current limiting regulated power supply with high precision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102081420B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743934A (en) * | 2013-12-23 | 2014-04-23 | 延锋伟世通电子科技（上海）有限公司 | High-precision high-side current detection circuit |
| CN112485494A (en) * | 2020-11-17 | 2021-03-12 | 天津津航计算技术研究所 | Current detection circuit based on triode |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2967251A (en) * | 1957-06-05 | 1961-01-03 | Gen Electric | Electronic power supply regulator |
| SU520573A1 (en) * | 1974-10-11 | 1976-07-05 | Предприятие П/Я А-1639 | DC Compensation Voltage Regulator |
| CN87202544U (en) * | 1987-02-25 | 1988-12-21 | 韩金祥 | High reliability and adjustable d.c regulated power supply |
| JP2006309312A (en) * | 2005-04-26 | 2006-11-09 | Sharp Corp | Regulator |
| CN201589986U (en) * | 2009-12-01 | 2010-09-22 | 延锋伟世通汽车电子有限公司 | High-precision current-limiting voltage-stabilizing power source |
-
2009
- 2009-12-01 CN CN 200910253648 patent/CN102081420B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743934A (en) * | 2013-12-23 | 2014-04-23 | 延锋伟世通电子科技（上海）有限公司 | High-precision high-side current detection circuit |
| CN112485494A (en) * | 2020-11-17 | 2021-03-12 | 天津津航计算技术研究所 | Current detection circuit based on triode |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102081420B (en) | 2013-06-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101308391B (en) | High precision low pressure difference linear voltage-stabilizing circuit | |
| CN102073332B (en) | Low temperature coefficient complementary metal oxide semiconductor (CMOS) band-gap reference circuit of output belt low drop-out linear voltage regulator | |
| CN101660928B (en) | Two-terminal semiconductor sensor device | |
| CN105992981B (en) | Low difference voltage regulator circuit | |
| WO2007066681A1 (en) | Regulator circuit and car provided with the same | |
| CN101329588A (en) | Overcurrent protection circuit | |
| CN102354251A (en) | Band-gap reference voltage circuit | |
| CN102624369B (en) | POR (Power-on Reset) circuit with variable reset point on basis of band gap reference source | |
| CN201589986U (en) | High-precision current-limiting voltage-stabilizing power source | |
| CN114995570A (en) | High-precision low-temperature-drift reference voltage circuit and debugging method thereof | |
| CN102081420B (en) | Current limiting regulated power supply with high precision | |
| CN102393779B (en) | LDO (low dropout regulator) circuit with compensation circuit | |
| CN103941794A (en) | Series connection type transistor voltage stabilizing circuit with differential amplification function | |
| CN203799290U (en) | Current expanding circuit of three-terminal integrated voltage stabilizer | |
| CN103616921A (en) | Control circuit of low-pressure-drop voltage stabilizer | |
| CN102386860A (en) | Amplifying circuit and current-voltage conversion circuit | |
| CN202171758U (en) | Band-gap reference voltage circuit | |
| CN104181473A (en) | Current source calibrating circuit | |
| CN103049033B (en) | Constant current source circuit and sampling circuit | |
| CN103631310A (en) | Band-gap reference voltage source | |
| CN103592991B (en) | Circuit protected by Power Limitation type for ambipolar linear voltage regulator | |
| US10353414B2 (en) | Bandgap reference circuit with inverted bandgap pairs | |
| CN104009503A (en) | Charging circuit and control circuit and control method | |
| TWI497255B (en) | Bandgap reference voltage circuit and electronic device | |
| CN110554728A (en) | Low dropout linear voltage stabilizing circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20130619 Termination date: 20131201 |