CN104635831A - Zero-power-consumption voltage overshoot protective circuit for voltage adjustor - Google Patents
Zero-power-consumption voltage overshoot protective circuit for voltage adjustor Download PDFInfo
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- CN104635831A CN104635831A CN201410427283.8A CN201410427283A CN104635831A CN 104635831 A CN104635831 A CN 104635831A CN 201410427283 A CN201410427283 A CN 201410427283A CN 104635831 A CN104635831 A CN 104635831A
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Abstract
The invention relates to a zero-power-consumption voltage overshoot protective circuit for a voltage adjustor. The voltage adjustor is a circuit used for stabilizing the voltage in an analog circuit. According to an intelligent card power stabilizer, the purpose is to provide a stable power source for a great number of storage cells (such as a CPU, an SRAM and an FLASH) and ensure the voltage of the power source within a reasonable working voltage range. Any voltage instability or working range exceeding of the voltage will lead to storage or read-write errors of the storage cells, and even a storage device is burnt under some conditions. The simple and novel zero-power-consumption output voltage overshoot protective circuit is adopted in the circuit structure, and the output overshoot voltage generated by powering on and fluctuations of the power source can be protected and restrained.
Description
Technical field:
The invention belongs to basic circuit design field, relate to a kind of zero-power voltage regulator voltage overshoot protection circuit.
Background technology:
In field of power management, voltage regulator is widely used, and the output of voltage regulator often occurs overshoot.Overshoot be formed with much possible reason, voltage regulator supply voltage powers on or occurs saltus step etc. in the course of work.Once there is voltage jump, the output load capacitance of voltage regulator has just stored certain electric charge, and this makes voltage regulator very unfavorable to load supplying, even load device may be caused to puncture due to overvoltage.
Export the loop bandwidth of overshoot often not by increasing operational amplifier to solve, because usually produce the speed of overshoot quickly, if rely on the bandwidth increasing operational amplifier, and then improve the response speed of circuit, so the power consumption of operational amplifier will increase greatly, be difficult to the requirement of the power consumption meeting circuit.
Mostly at present discharge paths is usually used to detect the output of voltage regulator in real time in order to eliminate overshoot, just once occur that overshoot is opened rapidly discharge paths electric charge of releasing and eliminated the common method of voltage overshoot and use output capacitance discharge circuit to make the output voltage of voltage regulator return to normal value.But these methods can not get on to prevent the overshoot phenomenon of output voltage from power supply electrifying and fluctuation situation at all.
Summary of the invention:
The object of the invention is to solve the problem that voltage regulator exports overshoot, a kind of output voltage and the DC power that neither lose voltage regulator are provided, go for again the anti-overshoot circuit of various voltage regulator.
The invention provides the anti-overshoot circuit of voltage for voltage regulator; for eliminating voltage regulator power supply electrifying and abnormity of power supply fluctuation causes the overshoot of output signal; it is characterized in that this circuit comprises the output voltage overshoot protection circuit of a PMOS PM2 and resistance R3 and electric capacity C2 formation; the drain electrode of PMOS PM2 is connected with the grid of PM1 pipe; the grid of PM2 and the link of R1 and C2 are connected together; PM2 pipe source and R4 hold and are connected to power supply; R2 two ends are connected with PM2 grid with power supply respectively, and C2 two ends are connected with PM2 grid with ground respectively.Under fluctuation situation occurs in the course of the work for power supply electrifying or power supply, there is overshoot in the output of voltage regulator, and the present invention can turn off the bleed off current path flowing to load capacitance instantaneously under this duty.Eliminate regulated output voltage overshoot.
As shown in Figure 1; this overshoot protection circuit is made up of a PMOS PM2 and resistance R3 and electric capacity C2; the drain electrode of PMOS PM2 is connected with the grid of PM1 pipe; the grid of PM2 and the link of R1 and C2 are connected together; PM2 pipe source and R4 hold and are connected to power supply; R2 two ends are connected with PM2 grid with power supply respectively, and C2 two ends are connected with PM2 grid with ground respectively
When power supply power on or moment of fluctuation of power supply makes PM2 pipe transient switching, the grid voltage of efferent duct PM1 pipe is raised, turns off PM1 pipe, do not produce instantaneous leakage current, avoid the overshoot of output voltage, when after power good, the grid voltage of PM2 pipe raises, and PM2 pipe turns off, do not produce any static direct current power consumption, PM1 pipe conducting simultaneously, voltage adjuster recovers normal work
Accompanying drawing illustrates:
Fig. 1 voltage regulator overshoot protection circuit structure diagram
The voltage regulator of a kind of no-voltage overshoot protection of Fig. 2 circuit on the supply voltage electric saltus step time oscillogram
Fig. 3 is a kind of apply voltage regulator of the present invention on the supply voltage electric saltus step time oscillogram
The oscillogram of voltage regulator when mains fluctuations saltus step of a kind of no-voltage overshoot protection of Fig. 4 circuit
Fig. 5 is a kind of applies the oscillogram of voltage regulator of the present invention when mains fluctuations saltus step
Embodiment:
Principle of work of the present invention is specifically introduced below in conjunction with accompanying drawing:
Voltage overshoot protection circuit as shown in Figure 1; resistance R3 and electric capacity C2 is by the impact of mains fluctuations; when supply voltage powers on or power supply in the course of the work saltus step occurs; node between R3 and C2 (i.e. the grid voltage of PM2) is dragged down instantaneously; PM2 transient switching, draws high the grid voltage of PM1, thus turns off PM1 instantaneously; have turned off the leakage current from PM1 to load, the overshoot of protection output voltage.When supply voltage reaches stable, the node (i.e. the grid voltage of PM2) between R3 and C2 is driven high, and PM2 grid voltage uprises; PM2 turns off; voltage overshoot protection circuit turns off, and PM1 recovers normal voltage adjuster duty, and this circuit does not produce any power consumption in normal operation.
By choose reasonable resistance R3 and electric capacity C2 value; and namely the breadth length ratio of PM1 can be eliminated and protect output voltage overshoot; C2 capacitance is larger sensitiveer to mains fluctuations; the R3 resistance value larger time to output voltage protection is longer, and the breadth length ratio that PM1 is larger will make protection circuit reaction velocity faster.
Accompanying drawing 2 be a kind of no-voltage overshoot protection circuit voltage regulator on the supply voltage electric saltus step time oscillogram, when supply voltage powers on, there is overshoot in regulated output voltage, and discharge time is longer; Accompanying drawing 3 be a kind of apply voltage regulator of the present invention on the supply voltage electric saltus step time oscillogram, regulated output voltage is without overshoot; Accompanying drawing 4 is a kind of oscillogram of voltage regulator when mains fluctuations saltus step of no-voltage overshoot protection circuit, and when supply voltage powers on power-supply fluctuation, overshoot appears in regulated output voltage; The oscillogram of 3 one kinds, accompanying drawing application voltage regulator of the present invention when mains fluctuations saltus step, when supply voltage powers on power-supply fluctuation, regulated output voltage is without overshoot.
Should be understood that, the present embodiment is used for illustrative purposes only, but not limitation of the present invention.Person skilled in the relevant technique, without departing from the spirit and scope of the present invention, can also make various conversion or change, and therefore all equivalent technical schemes also should belong to category of the present invention and limited by each claim.
Claims (3)
1. the voltage overshoot protection circuit of a zero-power voltage regulator; for eliminating voltage regulator power supply electrifying and abnormity of power supply fluctuation causes the overshoot of output signal; it is characterized in that this circuit comprises the output voltage overshoot protection circuit of a PMOS PM2 and resistance R3 and electric capacity C2 formation; the drain electrode of PMOS PM2 is connected with the grid of PM1 pipe; the grid of PM2 and the link of R1 and C2 are connected together; PM2 pipe source and R4 hold and are connected to power supply; R2 two ends are connected with PM2 grid with power supply respectively, and C2 two ends are connected with PM2 grid with ground respectively.
2. the voltage overshoot protection circuit of a kind of zero-power voltage regulator as claimed in claim 1; it is characterized in that when occurring fluctuation in voltage regulator power supply electrifying and Power Operating Process; the conducting of PM2 pipe; the grid voltage of PM1 pipe is raised; turn off PM1 at the leakage current powered on or in power-supply fluctuation situation, prevent output voltage from causing overshoot.
3. the voltage overshoot protection circuit of a kind of zero-power voltage regulator as claimed in claim 1, is characterized in that C2 can replace by mos capacitance is equivalent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410427283.8A CN104635831A (en) | 2014-08-27 | 2014-08-27 | Zero-power-consumption voltage overshoot protective circuit for voltage adjustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410427283.8A CN104635831A (en) | 2014-08-27 | 2014-08-27 | Zero-power-consumption voltage overshoot protective circuit for voltage adjustor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104635831A true CN104635831A (en) | 2015-05-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410427283.8A Pending CN104635831A (en) | 2014-08-27 | 2014-08-27 | Zero-power-consumption voltage overshoot protective circuit for voltage adjustor |
Country Status (1)
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| CN (1) | CN104635831A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164865A (en) * | 2018-11-23 | 2019-01-08 | 湖南国科微电子股份有限公司 | A kind of overshoot protection circuit, linear voltage regulator and power module |
| CN112947661A (en) * | 2021-02-12 | 2021-06-11 | 上海韦玏微电子有限公司 | Quick power-on voltage stabilizer circuit and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030184268A1 (en) * | 2002-04-01 | 2003-10-02 | Perez Raul A. | Protection circuit for miller compensated voltage regulators |
| US20060012346A1 (en) * | 2004-07-19 | 2006-01-19 | Jian-Rong Huang | Overshoot suppression circuit for a voltage regulation module |
| CN101192070A (en) * | 2006-11-24 | 2008-06-04 | 北京中电华大电子设计有限责任公司 | Power-on protection method and circuit for voltage regulator |
| CN202351727U (en) * | 2011-11-07 | 2012-07-25 | 北京经纬恒润科技有限公司 | Low-dropout linear voltage regulator |
| CN203102064U (en) * | 2013-01-07 | 2013-07-31 | 上海华虹集成电路有限责任公司 | Overshoot protection circuit of low-dropout linear regulator (LDO) and LDO |
| CN103699168A (en) * | 2013-12-10 | 2014-04-02 | 北京中电华大电子设计有限责任公司 | Voltage overshoot protection circuit of zero power consumption voltage regulator |
-
2014
- 2014-08-27 CN CN201410427283.8A patent/CN104635831A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030184268A1 (en) * | 2002-04-01 | 2003-10-02 | Perez Raul A. | Protection circuit for miller compensated voltage regulators |
| US20060012346A1 (en) * | 2004-07-19 | 2006-01-19 | Jian-Rong Huang | Overshoot suppression circuit for a voltage regulation module |
| CN101192070A (en) * | 2006-11-24 | 2008-06-04 | 北京中电华大电子设计有限责任公司 | Power-on protection method and circuit for voltage regulator |
| CN202351727U (en) * | 2011-11-07 | 2012-07-25 | 北京经纬恒润科技有限公司 | Low-dropout linear voltage regulator |
| CN203102064U (en) * | 2013-01-07 | 2013-07-31 | 上海华虹集成电路有限责任公司 | Overshoot protection circuit of low-dropout linear regulator (LDO) and LDO |
| CN103699168A (en) * | 2013-12-10 | 2014-04-02 | 北京中电华大电子设计有限责任公司 | Voltage overshoot protection circuit of zero power consumption voltage regulator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164865A (en) * | 2018-11-23 | 2019-01-08 | 湖南国科微电子股份有限公司 | A kind of overshoot protection circuit, linear voltage regulator and power module |
| CN112947661A (en) * | 2021-02-12 | 2021-06-11 | 上海韦玏微电子有限公司 | Quick power-on voltage stabilizer circuit and method |
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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, Applicant 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 Applicant before: Beijing CEC Huada Electronic Design Co., Ltd. |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150520 |