CN102480220B - Serial-connection type voltage adjusting circuit - Google Patents
Serial-connection type voltage adjusting circuit Download PDFInfo
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- CN102480220B CN102480220B CN201010558990.2A CN201010558990A CN102480220B CN 102480220 B CN102480220 B CN 102480220B CN 201010558990 A CN201010558990 A CN 201010558990A CN 102480220 B CN102480220 B CN 102480220B
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Abstract
The invention discloses a serial-connection type voltage adjusting circuit, which comprises a typical serial-connection voltage adjusting circuit body and a logic control circuit. The logic control circuit consists of a band-gap reference voltage input end and a ramp signal voltage input end, ramp signal voltage is gradually changed between zero and power voltage, an output end of the logic controller is connected with a positive input end of an error amplifier in the typical serial-connection voltage adjusting circuit body, when the ramp signal voltage is lower than band-gap reference voltage, voltage outputted by the logic control circuit is the ramp signal voltage, and when the ramp signal voltage is higher than the band-gap reference voltage, the voltage outputted by the logic control circuit is the band-gap reference voltage. By the aid of the serial-connection voltage adjusting circuit, peak impact can be avoided at the started moment.
Description
Technical field
The present invention relates to analog power technology, particularly a kind of serial-connection type voltage adjusting circuit.
Background technology
Voltage-regulating circuit is commonly called as voltage stabilizing circuit, and its function is from a understable supply voltage, to obtain a galvanic current to press.Along with the development of analog hybrid, Circuits System requires increasing precisely voltage and current benchmark, and for controlling voltage, the modal design of modern circuit is voltage-regulating circuit, and general voltage-regulating circuit divides again parallel connection and tandem type by structure.Tradition serial-connection type voltage adjusting circuit is connected on power tube between input and output and is controlled the voltage of stable output by continuous adjustment.
It shown in Fig. 1, is a typical serial-connection type voltage adjusting circuit, voltage Modulating Power pipe T1 is NMOS pipe, the drain electrode of voltage Modulating Power pipe T1 connects power source voltage Vcc, source electrode stable output voltage Vout, the first resistance R 1, the second resistance R 2 is connected on as dividing potential drop sample resistance between the source electrode and ground of voltage Modulating Power pipe T1, the first resistance R 1, the serial connection point of the second resistance R 2 is connected with the negative input end of error amplifier 10, the positive input terminal of error amplifier 10 connects reference voltage V ref, reference voltage V ref is produced by band gap reference conventionally, the input of the output termination buffer 11 of error amplifier 10, the output of buffer 11 is connected with the grid of voltage Modulating Power pipe T1, output loading RLoad is connected between the source electrode and ground of voltage Modulating Power pipe T1, output capacitance Cout and dead resistance ESR are serially connected between the source electrode and ground of voltage Modulating Power pipe T1.
The voltage adjustment of typical case's serial-connection type voltage adjusting circuit is to realize by dividing potential drop sample resistance the first resistance R 1, the second resistance R 2, error amplifier 10, buffer 11, the such feedback control loop of voltage-reg-ulator tube T1.When typical case's serial-connection type voltage adjusting circuit starts, stable output voltage Vout transient state is zero, the reference voltage V ref of the positive input terminal of error amplifier 10 first works, error amplifier 10 produces positive signal, by buffer 11, at the grid of voltage Modulating Power pipe T1, produce high level, make NMOS voltage Modulating Power pipe T1 conducting, burning voltage Vout has just had like this, dividing potential drop sample resistance the first resistance R 1, when the dividing potential drop of the second resistance R 2 is greater than reference voltage V ref, error amplifier 10 produces negative signal, the grid potential of voltage Modulating Power pipe T1 is reduced, thereby burning voltage Vout is reduced, when the dividing potential drop of dividing potential drop sample resistance the first resistance R 1, the second resistance R 2 is less than reference voltage V ref, error amplifier 10 produces positive signal, the grid potential of voltage Modulating Power pipe T1 is raise, thereby burning voltage Vout is raise, through adjusting, reach homeostasis
Typical case's serial-connection type voltage adjusting circuit is when starting, to utilize reference voltage V ref by error amplifier 10, to go to control the conducting of NMOS tube voltage Modulating Power pipe T1, because the resistance sampling feedback voltage transient state of error amplifier 10 negative input ends is zero, and the reference voltage V ref of positive input terminal can put in place fast, the gain of error amplifier 10 is very high, therefore the grid of NMOS voltage Modulating Power pipe T1 can exist transient high voltages to impact, the now suitable switch of NMOS voltage Modulating Power pipe T1, power source voltage Vcc is transferred to NMOS voltage Modulating Power pipe T1 source electrode stable output voltage Vout immediately, spike of burning voltage Vout transient response of output impacts, then by adjusting, just slowly enter stable state, it is inevitable that this spike impacts starting moment, it easily produces overvoltage, cross power consumption damage, and affect voltage-regulating circuit reliability.The transient response of the burning voltage Vout that Figure 2 shows that the output of typical serial-connection type voltage adjusting circuit when starting, transverse axis is time T, the longitudinal axis is voltage, has as seen spike phenomenon.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of serial-connection type voltage adjusting circuit, can avoid producing spike impact in startup moment.
For solving the problems of the technologies described above, serial-connection type voltage adjusting circuit of the present invention, comprises a typical serial-connection type voltage adjusting circuit, also comprises a logic control circuit;
Logic control circuit comprises bandgap voltage reference input, ramp signal voltage input end, and ramp signal voltage is gradual between zero-sum supply voltage;
The positive input terminal of the error amplifier in the output termination typical case serial-connection type voltage adjusting circuit of logic control circuit, when ramp signal voltage is less than bandgap voltage reference, the output voltage of logic control circuit is ramp signal voltage, when ramp signal voltage is greater than bandgap voltage reference, the output voltage of logic control circuit is bandgap voltage reference.
Typical case's serial-connection type voltage adjusting circuit comprises NMOS voltage Modulating Power pipe, the first resistance, the second resistance, error amplifier, buffer;
The drain electrode of voltage Modulating Power pipe connects supply voltage, source electrode stable output voltage, the first resistance, the second resistance are connected on as dividing potential drop sample resistance between the source electrode and ground of voltage Modulating Power pipe, the serial connection point of the first resistance, the second resistance is connected with the negative input end of error amplifier, the input of the output termination buffer of error amplifier, the output of buffer is connected with the grid of voltage Modulating Power pipe.
Logic control circuit can comprise a comparator, a not gate, one the 2nd NMOS pipe, one the 3rd NMOS pipe;
The source electrode of the 2nd NMOS pipe and the 3rd NMOS pipe connects the positive input terminal of the error amplifier in described typical serial-connection type voltage adjusting circuit, the 2nd drain electrode of NMOS pipe and the positive input terminal of comparator connect bandgap voltage reference, the negative input termination ramp signal voltage of the drain electrode of the 3rd NMOS pipe and comparator, the input of output termination not gate of comparator and the grid of the 3rd NMOS pipe, the output of not gate connects the grid of the 2nd NMOS pipe.
Logic control circuit can comprise a comparator, a not gate, one the 4th PMOS pipe, one the 5th PMOS pipe, the drain electrode of the 4th PMOS pipe and the 5th PMOS pipe connects the positive input terminal of the error amplifier in described typical serial-connection type voltage adjusting circuit, the 4th source electrode of PMOS pipe and the positive input terminal of comparator connect bandgap voltage reference, the negative input termination ramp signal voltage of the source electrode of the 5th PMOS pipe and comparator, the input of output termination not gate of comparator and the grid of the 4th PMOS pipe, the output of not gate connects the grid of the 5th PMOS pipe.
Serial-connection type voltage adjusting circuit of the present invention, ramp signal voltage Vramp is exclusively used in the starting state of circuit, and bandgap voltage reference Vref is for the stable state of circuit, like this when starting state, it is utilization gradual ramp signal voltage Vramp between zero-sum power source voltage Vcc voltage removes to control voltage Modulating Power pipe T1 conducting by error amplifier, the startup transient response of the burning voltage Vout of serial-connection type voltage adjusting circuit output is gradual controlled, in startup moment, can avoid producing spike impacts, when ramp signal voltage Vramp is greater than bandgap voltage reference Vref, circuit enters stable state, stable output voltage Vout is limited in safe scope, can greatly improve like this reliability of serial-connection type voltage adjusting circuit, reduce and start power consumption, realize serial-connection type voltage adjusting circuit clean boot, avoid high surge and recoil overvoltage to damage.
Accompanying drawing explanation
Below in conjunction with the drawings and the specific embodiments, the present invention is described in further detail.
Fig. 1 is the circuit diagram of a typical serial-connection type voltage adjusting circuit;
Fig. 2 is the burning voltage of the typical serial-connection type voltage adjusting circuit output transient response figure when starting;
Fig. 3 is the circuit diagram of serial-connection type voltage adjusting circuit one execution mode of the present invention;
Fig. 4 is the voltage signal of positive input terminal and the burning voltage transient response figure of correspondence that serial-connection type voltage adjusting circuit of the present invention is input to error amplifier.
Fig. 5 is the first circuit diagram of implementing of serial-connection type voltage adjusting circuit of the present invention;
Fig. 6 is the second circuit diagram of implementing of serial-connection type voltage adjusting circuit of the present invention.
Embodiment
Serial-connection type voltage adjusting circuit one execution mode of the present invention as shown in Figure 3, comprises a typical serial-connection type voltage adjusting circuit 20, a logic control circuit 21;
Typical case's serial-connection type voltage adjusting circuit 20 comprises a NMOS voltage Modulating Power pipe T1, the first resistance R 1, the second resistance R 2, error amplifier 10, buffer 11, output capacitance Cout, dead resistance ESR, output loading RLoad, the drain electrode of voltage Modulating Power pipe T1 connects power source voltage Vcc, source electrode stable output voltage Vout, the first resistance R 1, the second resistance R 2 is connected on as dividing potential drop sample resistance between the source electrode and ground of voltage Modulating Power pipe T1, the first resistance R 1, the serial connection point of the second resistance R 2 is connected with the negative input end of error amplifier 10, the input of the output termination buffer 11 of error amplifier 10, the output of buffer 11 is connected with the grid of voltage Modulating Power pipe T1, output loading RLoad is connected between the source electrode and ground of voltage Modulating Power pipe T1, output capacitance Cout and dead resistance ESR are serially connected between the source electrode and ground of voltage Modulating Power pipe T1, the output of logic control circuit 21 described in the negative input termination of described error amplifier 10,
Serial-connection type voltage adjusting circuit of the present invention, on the basis of typical serial-connection type voltage adjusting circuit, to increase by a logic control circuit, improve the positive input terminal voltage of the error amplifier in typical case's serial-connection type voltage adjusting circuit while starting, logic control circuit has two groups of signal inputs, one group of signal is traditional bandgap voltage reference Vref, other one group of signal is the ramp signal voltage Vramp that is exclusively used in startup, ramp signal voltage Vramp is gradual between zero-sum power source voltage Vcc, when ramp signal voltage Vramp is less than bandgap voltage reference Vref, the positive input terminal voltage of error amplifier is ramp signal voltage Vramp, it is gradual that the burning voltage Vout of serial-connection type voltage adjusting circuit output follows ramp signal voltage Vramp, circuit is in starting state, when ramp signal voltage Vramp is greater than bandgap voltage reference Vref, the positive input terminal voltage of error amplifier is bandgap voltage reference Vref, the burning voltage Vout of serial-connection type voltage adjusting circuit output is determined by bandgap voltage reference Vref, circuit enters stable state.
The charging current adjustment of the RC circuit that the slope of ramp signal voltage Vramp can charge by resistance capacitance, to meet the startup low-power consumption requirement of serial-connection type voltage adjusting circuit, when not considering that start-up time is during length, the preferential power consumption that reduces, the slope of ramp signal voltage Vramp can be smooth, otherwise the slope of ramp signal voltage Vramp can steepening.
Serial-connection type voltage adjusting circuit of the present invention, ramp signal voltage Vramp is exclusively used in the starting state of circuit, and bandgap voltage reference Vref is for the stable state of circuit, like this when starting state, it is utilization gradual ramp signal voltage Vramp between zero-sum power source voltage Vcc voltage removes to control voltage Modulating Power pipe T1 conducting by error amplifier, the startup transient response of the burning voltage Vout of serial-connection type voltage adjusting circuit output is gradual controlled, in startup moment, can avoid producing spike impacts, when ramp signal voltage Vramp is greater than bandgap voltage reference Vref, circuit enters stable state, stable output voltage Vout is limited in safe scope, can greatly improve like this reliability of serial-connection type voltage adjusting circuit, reduce and start power consumption, realize serial-connection type voltage adjusting circuit clean boot, avoid high surge and recoil overvoltage to damage.Serial-connection type voltage adjusting circuit of the present invention, is adapted at manufacturing under the technique of metal-oxide-semiconductor field effect t compatibility.
Shown in Fig. 4, be two kinds of voltage signals and the corresponding burning voltage Vout transient response of the serial-connection type voltage adjusting circuit of the present invention positive input terminal that is input to error amplifier 10, the corresponding starting state of AR section, the corresponding stable state of BE section.
The first embodiment as shown in Figure 5, serial-connection type voltage adjusting circuit comprises a kind of typical serial-connection type voltage adjusting circuit 20 and a logic control circuit 21, typical case's serial-connection type voltage adjusting circuit 20 is same as shown in Figure 3, logic control circuit 21 comprises a comparator 12, one not gate 13, one the 2nd NMOS pipe T2, one the 3rd NMOS pipe T3, the source electrode of the 2nd NMOS pipe T2 and the 3rd NMOS pipe T3 connects the positive input terminal of the error amplifier 10 in described typical serial-connection type voltage adjusting circuit 20, the 2nd NMOS pipe drain electrode of T2 and the positive input terminal tape splicing gap reference voltage V ref of comparator 12, the 3rd NMOS pipe drain electrode of T3 and the negative input termination ramp signal voltage Vramp of comparator 12, the grid of the input of the output termination not gate 13 of comparator 12 and the 3rd NMOS pipe T3, the output of not gate 13 connects the grid of the 2nd NMOS pipe T2.
The course of work of serial-connection type voltage adjusting circuit shown in Fig. 5 is as follows: during circuit start, the burning voltage Vout transient state of circuit output is zero, the positive input terminal of error amplifier 10 is first worked by ramp signal voltage Vramp, ramp signal voltage Vramp increases from zero to input power Vcc, error amplifier 10 produces amplifying signal, by buffer 11, at the grid of voltage Modulating Power pipe T1, produce level, make NMOS voltage Modulating Power pipe T1 conducting, the burning voltage Vout of circuit output just follows ramp signal voltage Vramp variation like this, when ramp signal voltage Vramp is less than bandgap voltage reference Vref, the positive input terminal voltage of error amplifier 10 is ramp signal voltage Vramp, circuit is in starting state, it is gradual that the burning voltage Vout of output follows ramp signal voltage Vramp,
when ramp signal voltage, Vramp is greater than bandgap voltage reference Vref, comparator 12 overturns, output negative signal, turn-off the 3rd NMOS pipe T3, and now the grid of the 2nd NMOS pipe T2 is high level, therefore the 2nd NMOS pipe T2 conducting, the positive input voltage of error amplifier 10 is bandgap voltage reference Vref, serial-connection type voltage adjusting circuit enters stable state, stable output voltage Vout is determined by bandgap voltage reference Vref, when dividing potential drop sample resistance the first resistance R 1, when the dividing potential drop of the second resistance R 2 is less than reference voltage V ref, error amplifier 10 produces positive signal, the grid potential of voltage Modulating Power pipe T1 is raise, thereby burning voltage Vout is raise, through adjusting, reach homeostasis,
The second embodiment as shown in Figure 6, serial-connection type voltage adjusting circuit comprises a kind of typical serial-connection type voltage adjusting circuit 20 and a logic control circuit 21, typical case's serial-connection type voltage adjusting circuit 20 is same as shown in Figure 3, logic control circuit 21 comprises a comparator 12, one not gate 13, one the 4th PMOS pipe T4, one the 5th PMOS pipe T5, the drain electrode of the 4th PMOS pipe T4 and the 5th PMOS pipe T5 connects the positive input terminal of the error amplifier 10 in described typical serial-connection type voltage adjusting circuit 20, the 4th PMOS pipe source electrode of T4 and the positive input terminal tape splicing gap reference voltage V ref of comparator 12, the 5th PMOS pipe source electrode of T5 and the negative input termination ramp signal voltage Vramp of comparator 12, the grid of the input of the output termination not gate 13 of comparator 12 and the 4th PMOS pipe T4, the output of not gate 13 connects the grid of the 5th PMOS pipe T5.
Claims (2)
1. a serial-connection type voltage adjusting circuit, comprises a typical serial-connection type voltage adjusting circuit, it is characterized in that, also comprises a logic control circuit;
Logic control circuit comprises bandgap voltage reference input, ramp signal voltage input end, and ramp signal voltage is gradual between zero-sum supply voltage;
The positive input terminal of the error amplifier in the output termination typical case serial-connection type voltage adjusting circuit of logic control circuit, when ramp signal voltage is less than bandgap voltage reference, the output voltage of logic control circuit is ramp signal voltage, when ramp signal voltage is greater than bandgap voltage reference, the output voltage of logic control circuit is bandgap voltage reference;
Described logic control circuit, comprises a comparator, a not gate, one the 2nd NMOS pipe, one the 3rd NMOS pipe;
The source electrode of the 2nd NMOS pipe and the 3rd NMOS pipe connects the positive input terminal of the error amplifier in described typical serial-connection type voltage adjusting circuit, the 2nd drain electrode of NMOS pipe and the positive input terminal of comparator connect bandgap voltage reference, the negative input termination ramp signal voltage of the drain electrode of the 3rd NMOS pipe and comparator, the input of output termination not gate of comparator and the grid of the 3rd NMOS pipe, the output of not gate connects the grid of the 2nd NMOS pipe; Or
Described logic control circuit, comprise a comparator, a not gate, one the 4th PMOS pipe, one the 5th PMOS pipe, the drain electrode of the 4th PMOS pipe and the 5th PMOS pipe connects the positive input terminal of the error amplifier in described typical serial-connection type voltage adjusting circuit, the 4th source electrode of PMOS pipe and the positive input terminal of comparator connect bandgap voltage reference, the negative input termination ramp signal voltage of the source electrode of the 5th PMOS pipe and comparator, the input of output termination not gate of comparator and the grid of the 4th PMOS pipe, the output of not gate connects the grid of the 5th PMOS pipe.
2. serial-connection type voltage adjusting circuit according to claim 1, is characterized in that, typical serial-connection type voltage adjusting circuit comprises NMOS voltage Modulating Power pipe, the first resistance, the second resistance, error amplifier, buffer;
The drain electrode of voltage Modulating Power pipe connects supply voltage, source electrode stable output voltage, the first resistance, the second resistance are connected on as dividing potential drop sample resistance between the source electrode and ground of voltage Modulating Power pipe, the serial connection point of the first resistance, the second resistance is connected with the negative input end of error amplifier, the input of the output termination buffer of error amplifier, the output of buffer is connected with the grid of voltage Modulating Power pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010558990.2A CN102480220B (en) | 2010-11-25 | 2010-11-25 | Serial-connection type voltage adjusting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010558990.2A CN102480220B (en) | 2010-11-25 | 2010-11-25 | Serial-connection type voltage adjusting circuit |
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| CN102480220A CN102480220A (en) | 2012-05-30 |
| CN102480220B true CN102480220B (en) | 2014-04-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104779796A (en) * | 2015-03-30 | 2015-07-15 | 陆俊 | Power supply output voltage adjusting circuit and device |
| KR20220125598A (en) * | 2021-03-05 | 2022-09-14 | 삼성전자주식회사 | Voltage trimming circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1665114A (en) * | 2004-03-05 | 2005-09-07 | 英特赛尔美国股份有限公司 | Startup circuit for converter with pre-biased load |
| CN101295922A (en) * | 2008-06-13 | 2008-10-29 | 北京中星微电子有限公司 | Soft starting device capable of implementing linear control |
| CN101841238A (en) * | 2010-04-12 | 2010-09-22 | 无锡中星微电子有限公司 | Boost DC/DC converter and logic control circuit therein |
| CN101841239A (en) * | 2010-04-12 | 2010-09-22 | 无锡中星微电子有限公司 | Boost DC/DC converter and logic control circuit thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI352475B (en) * | 2007-12-27 | 2011-11-11 | Realtek Semiconductor Corp | Device and method for surge prevention |
| US7928715B2 (en) * | 2008-04-22 | 2011-04-19 | Seiko Instruments Inc. | Switching regulator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1665114A (en) * | 2004-03-05 | 2005-09-07 | 英特赛尔美国股份有限公司 | Startup circuit for converter with pre-biased load |
| CN101295922A (en) * | 2008-06-13 | 2008-10-29 | 北京中星微电子有限公司 | Soft starting device capable of implementing linear control |
| CN101841238A (en) * | 2010-04-12 | 2010-09-22 | 无锡中星微电子有限公司 | Boost DC/DC converter and logic control circuit therein |
| CN101841239A (en) * | 2010-04-12 | 2010-09-22 | 无锡中星微电子有限公司 | Boost DC/DC converter and logic control circuit thereof |
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| CN102480220A (en) | 2012-05-30 |
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Owner name: SHANGHAI HUAHONG GRACE SEMICONDUCTOR MANUFACTURING Free format text: FORMER OWNER: HUAHONG NEC ELECTRONICS CO LTD, SHANGHAI Effective date: 20140103 |
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