CN101196755A - High-precision voltage regulator - Google Patents
High-precision voltage regulator Download PDFInfo
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- CN101196755A CN101196755A CNA2006101648163A CN200610164816A CN101196755A CN 101196755 A CN101196755 A CN 101196755A CN A2006101648163 A CNA2006101648163 A CN A2006101648163A CN 200610164816 A CN200610164816 A CN 200610164816A CN 101196755 A CN101196755 A CN 101196755A
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- voltage
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- reference voltage
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- precision
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Abstract
The invention discloses a high precision voltage regulator, which requires a reference voltage for a reference voltage input of an error amplifier, the output precision mainly depends on the reference voltage. The working voltage of the circuit generated by the reference voltage can be input voltage VIN, because the range of input voltage can be large and interference can be existed, the reference voltage error can be large. The voltage regulator of the invention realizes high precision by utilizing two reference voltage generating circuits. During the power up process, reference voltage VRA is used, after the output is relatively stable, reference VRB is used, normally, the output pressure is fixed or with a small changing range, consequently, precision of VRB can be high, and the precision of output voltage VOUT can be ensured.
Description
Technical field
The present invention is a kind of high-precision voltage regulator, can realize with integrated circuit.
Background technology
On the one hand, the voltage regulator chip as independent has obtained a large amount of application in electronic industry.
On the other hand, along with the development of integrated circuit technology, the operating voltage of IC interior device becomes more and more lower, but in order to satisfy application requirements, integrated circuit input output voltage may be bigger than internal work voltage, even in a bigger scope.That is to say that the integrated circuit with many power supply systems (more than two) is more and more general, so the Embedded Application of voltage regulator also just more and more widely.
In some specific application, the voltage output accuracy is a very important index of voltage regulator, and output accuracy depends on the precision of input reference voltage to a great extent.Usually, reference voltage derives from reference voltage generating circuit, and its operating voltage is an input voltage, because input voltage range may be very big, even exist bigger ripple, this can influence the precision of reference voltage, thereby influences the precision of output voltage.The present invention selects circuit to guarantee that to a certain extent the reference voltage input of voltage regulator circuit in the circuit working process has very high precision by two reference voltage generating circuits and reference voltage.
The high-precision voltage regulator that the present invention proposes, its principal character is to have two reference voltage generating circuits, and by selecting circuit to select one of two reference voltages, in the input voltage power up, selecting operating voltage is the output of the reference voltage generating circuit of input voltage, after power on end and output voltage incipient stability, selecting operating voltage is the output of the reference voltage generating circuit of output voltage, thereby guarantees that output voltage has higher precision.
Summary of the invention
The principal character of the high-precision voltage regulator (as Fig. 1 and 2) that the present invention proposes is to have the reference voltage V that two timesharing are selected
RAAnd V
RB, reference voltage V
RAThe operating voltage of generative circuit is input voltage V
IN, another reference voltage is given birth to V
RBBecoming the operating voltage of circuit is output voltage V
OUT, in the incipient stability process of input voltage power up and voltage regulator circuit, selecting circuit to select operating voltage is the output V of the reference voltage generating circuit of input voltage
RA, selecting operating voltage afterwards is the output V of the reference voltage generating circuit of output voltage
RBUsually, output voltage can be certain, perhaps has very little variation range, so operating voltage is the output V of the reference voltage generating circuit of output voltage
RBPrecision can be very high, thereby voltage regulator circuit reference voltage input precision in the course of the work just is guaranteed, thereby guaranteed that voltage regulator has higher precision.Reference voltage is selected the selection signal V of circuit
CHThe last electro-detection and the delay circuit that come from input voltage.
Description of drawings
Fig. 1～2nd, the structure diagram of voltage regulator. Among the figure, the 1st, voltage regulator circuit, the 2nd, reference voltage generates and selects electricity Road, input voltage are VIN, output voltage is VOUT Wherein, voltage regulator circuit 1 by error amplifier 3, power device 4, Divider resistance 5 and 6 consists of, and voltage division signal is input to error amplifier; Reference voltage generates and selects circuit 2 by the reference electricity Volt circuit A7, reference voltage circuit B8, upper electro-detection and delay circuit 9 and selection circuit 10 consist of. Reference voltage circuit A 7 operating voltage is input voltage VIN, reference voltage is output as VRA The operating voltage of reference voltage circuit B8 is the output electricity Press VOUT, reference voltage is output as VRB The operating voltage of upper electro-detection and delay circuit 9 is VIN, output VCHThe control choosing Select circuit 10. Select the output V of circuitRBe used for the reference voltage input of error amplifier 3.
Embodiment
The specific embodiment of the present invention is described as follows:
1. main innovate point of the present invention is to have two reference voltage generating circuits (as Fig. 2), and two reference voltages are exported the time-sharing work by the control of selector switch selection signal;
2. the delay time of going up electro-detection and delay circuit needs appropriate design, thereby guarantees the circuit reliably working;
3. the high-precision voltage regulator of the present invention's proposition can be used as independent integrated circuit and realizes that the Embedded Application that also can be used as integrated circuit is come accomplished;
4. the integrated circuit of the high-precision voltage regulator that proposes of the present invention realizes that technology may be CMOS technology, BIPOLAR technology, also may be BICMOS technology;
5. in the side circuit implementation procedure, need the high precision design of interlock circuit (as error amplifier circuit 3, reference voltage generating circuit 7 and 8 etc.) could guarantee finally that the output of voltage regulator has high precision.
Claims (10)
1. a high-precision voltage regulator is characterized in that generating and select circuit to constitute by voltage regulator circuit and reference voltage.
2. voltage regulator circuit according to claim 1 is characterized in that being made of error amplifier, power device and two divider resistances.
3. reference voltage according to claim 1 generates and selects circuit, it is characterized in that going up electro-detection and delay circuit and one by two reference voltage generating circuits, one selects circuit to constitute.
4. reference voltage generating circuit according to claim 3, the operating voltage that it is characterized in that a reference voltage generating circuit is an input voltage, the operating voltage of another reference voltage generating circuit is an output voltage.
5. reference voltage generating circuit according to claim 4 is characterized in that two reference voltages are that voltage regulator circuit is exported in timesharing.
6. according to claim 4 or 5 described reference voltage generating circuits, it is characterized in that selecting circuit to select in two reference voltages outputs one to import as reference of voltage regulator circuit by one.
7. selection circuit according to claim 6 is characterized in that selecting the selection signal of circuit to come from electro-detection and delay circuit on the input voltage.
8. according to claim 6 or 7 described selection circuit, it is characterized in that selecting in power up circuit to select operating voltage is the output of the reference voltage generating circuit of input voltage, and it is the output of the reference voltage generating circuit of output voltage that operating voltage is selected in the basicly stable back of output voltage.
9. power device according to claim 2 is characterized in that implementation may be PMOS device, nmos device or bipolar technology device.
10. high-precision voltage regulator according to claim 1 and 2 is characterized in that can be used as an independently integrated circuit, also may be as the part of integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101648163A CN101196755B (en) | 2006-12-06 | 2006-12-06 | High-precision voltage regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101648163A CN101196755B (en) | 2006-12-06 | 2006-12-06 | High-precision voltage regulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101196755A true CN101196755A (en) | 2008-06-11 |
| CN101196755B CN101196755B (en) | 2011-01-12 |
Family
ID=39547203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101648163A Active CN101196755B (en) | 2006-12-06 | 2006-12-06 | High-precision voltage regulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101196755B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290970A (en) * | 2011-08-08 | 2011-12-21 | 无锡中星微电子有限公司 | Mode selecting and controlling circuit in voltage converter |
| CN105138062A (en) * | 2014-05-29 | 2015-12-09 | 展讯通信（上海）有限公司 | System improving load regulation rate of low-pressure-difference linear voltage regulator |
| CN105305810A (en) * | 2014-05-29 | 2016-02-03 | 展讯通信（上海）有限公司 | Improved charge pump circuit system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003150254A (en) * | 2001-11-09 | 2003-05-23 | Seiko Instruments Inc | Voltage regulator |
| JP2003216252A (en) * | 2001-11-15 | 2003-07-31 | Seiko Instruments Inc | Voltage regulator |
| JP2004118411A (en) * | 2002-09-25 | 2004-04-15 | Seiko Instruments Inc | Voltage regulator |
| KR100578840B1 (en) * | 2004-05-24 | 2006-05-11 | 삼성에스디아이 주식회사 | A power supply in a lighting emitting device |
| KR20070094766A (en) * | 2004-12-08 | 2007-09-21 | 기아웨 포레스트 엘엘시 | Adaptive digital voltage regulator |
-
2006
- 2006-12-06 CN CN2006101648163A patent/CN101196755B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290970A (en) * | 2011-08-08 | 2011-12-21 | 无锡中星微电子有限公司 | Mode selecting and controlling circuit in voltage converter |
| CN105138062A (en) * | 2014-05-29 | 2015-12-09 | 展讯通信（上海）有限公司 | System improving load regulation rate of low-pressure-difference linear voltage regulator |
| CN105305810A (en) * | 2014-05-29 | 2016-02-03 | 展讯通信（上海）有限公司 | Improved charge pump circuit system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101196755B (en) | 2011-01-12 |
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| C14 | Grant of patent or utility model | ||
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| CP02 | Change in the address of a patent holder |
Address after: 102209 Beijing, Beiqijia, the future of science and technology in the south area of China electronic network security and information technology industry base C building, Patentee after: Beijing CEC Huada Electronic Design Co., Ltd. Address before: 100102 Beijing City, Chaoyang District Lize two Road No. 2, Wangjing science and Technology Park A block five layer Patentee before: Beijing CEC Huada Electronic Design Co., Ltd. |