CN105867503B - A kind of control method of reference voltage source circuit and reference voltage - Google Patents
A kind of control method of reference voltage source circuit and reference voltage Download PDFInfo
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- CN105867503B CN105867503B CN201610390442.0A CN201610390442A CN105867503B CN 105867503 B CN105867503 B CN 105867503B CN 201610390442 A CN201610390442 A CN 201610390442A CN 105867503 B CN105867503 B CN 105867503B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
Abstract
The invention discloses a kind of reference voltage source circuit and the control method of reference voltage, the first reference voltage generating circuit produces the first reference voltage signal, and it is equal to the first reference voltage signal that bandgap voltage reference is exported.When system enters holding state, then used using the output voltage feed system in the first reference voltage signal source as the reference voltage, and stop the work of bandgap voltage reference, so may be such that under low power consumpting state, the small power consumption of system.
Description
Technical field
The present invention relates to reference voltage field, more specifically to a kind of reference voltage source circuit and reference voltage
Control method.
Background technology
In conventional work system such as Switching Power Supply, it usually needs reference voltage source circuit offer reference voltage is as opening
The benchmark in powered-down source, generating circuit from reference voltage common in the art is band-gap reference circuit, and band-gap reference circuit can
The constant voltage of output is kept under conditions of mains voltage variations and circuit temperature change, the reference electricity worked as circuit
Pressure.
But band-gap reference circuit has generally comprised band-gap circuit in the prior art, consumption fixation is needed in the course of the work
Power consumption, especially occupies the power consumption of larger proportion in low consumption circuit, i.e., when system enters low power consumpting state, band-gap reference electricity
The loss accounting on road just seems especially prominent.
The content of the invention
In view of this, the present invention proposes a kind of reference voltage source circuit and the control method of reference voltage, passes through first
Reference voltage generating circuit produces the first reference voltage signal, when the system applied enters holding state, then using first
Reference voltage signal can effectively reduce the loss of bandgap voltage reference as the reference voltage of system.
According to a kind of reference voltage source circuit of the present invention, including bandgap voltage reference, the reference voltage source circuit
Also include the first reference voltage generating circuit,
The bandgap voltage reference is to provide the first reference voltage signal；
First reference voltage generating circuit receives first reference voltage signal and standby signal, to produce first
Reference voltage signal, first reference voltage signal is equal to first reference voltage signal；
Wherein, the standby signal is to characterize whether system is in holding state, when the system is in holding state
When, then first reference voltage signal is supplied into the system as the output signal of the reference voltage source circuit and used,
And the bandgap voltage reference is stopped.
Preferably, when the system enters holding state, first reference voltage signal gradually increases, until reaching
Kept during first reference voltage signal stable.
Preferably, first reference voltage generating circuit includes comparison circuit, logic circuit and signal generating circuit,
The comparison circuit receives the first reference voltage signal and first reference voltage signal, compares letter to produce
Number；
The logic circuit receives the comparison signal, to generate multiple switch control signal；
The signal generating circuit receives the multiple switch controlling signal, with according to the multiple switch controlling signal control
Make the on-state of multiple current sources, the voltage that the current source of connection is produced on divider resistance is as first reference voltage
Signal.
Preferably, when the system enters holding state, the comparison circuit enters working condition, when the described first ginseng
When examining voltage signal and reaching first reference voltage signal, the comparison circuit is stopped.
Further, the logic circuit includes one-shot circuit, multiple delay circuits and the life of multiple switch control signal
Into circuit,
The one-shot circuit receives the comparison signal, to generate the first single pulse signal, the multiple switch control
First switch control signal generative circuit in signal generating circuit receives the first single pulse signal generation first switch control
Signal processed；
The multiple delay circuit is sequentially connected in series, and the first delay in the multiple delay circuit receives described first
Single pulse signal and the comparison signal, to generate the first postpones signal；Residual circuit in the multiple delay circuit is successively
The output signal and the comparison signal of a upper delay circuit are received, to generate multiple postpones signals；
The residual circuit of the multiple switch controlling signal generative circuit receives first postpones signal and multiple delays
Signal, to generate corresponding multiple switch control signal.
Preferably, the multiple switch controlling signal generative circuit also receives the standby signal, when the standby signal
When characterizing the system in normal operating conditions, then the multiple switch controlling signal is changed into low level disarmed state.
Further, the logic circuit also includes digit speech recognition circuit,
The digit speech recognition circuit receives the multiple switch controlling signal, and current the multiple switch is controlled to believe
Number be converted to the multiple switch control signal of binary code sign.
Further, the signal generating circuit includes the divider resistance, charging capacitor, multiple current sources and multiple opened
Guan Guan；
The multiple current source is connected in parallel, and multiple current sources and corresponding the multiple switching tube are connected in series；
The multiple switch controlling signal controls the on off state of the multiple switching tube respectively, to control corresponding electricity
Stream source on-state；
The multiple current source is connected with the divider resistance, and the charging capacitor and the divider resistance are in parallel, institute
The voltage of end points in the middle of divider resistance is stated as first reference voltage signal.
Preferably, the current value size of the multiple current source is identical or different.
Preferably, when the current value of the multiple current source is of different sizes；
According to the turn-on sequence of the switching tube of series connection with it, the current value of the multiple current source increases successively.
According to a kind of control method of reference voltage of the present invention, comprise the following steps：
The first reference voltage signal is provided according to bandgap voltage reference；
First reference voltage signal, the first reference voltage letter are produced according to the first reference voltage signal and standby signal
Number be more than or equal to first reference voltage signal；
The standby signal of reception system,
When the standby signal, which characterizes the system, is in normal operating conditions, then by first reference voltage signal
The system is supplied as the reference voltage to use；
When the standby signal, which characterizes the system, is in holding state, then using first reference voltage signal as
Reference voltage supplies the system and used, and the bandgap voltage reference is stopped.
Preferably, when the system enters holding state, first reference voltage signal gradually increases, until reaching
Kept during first reference voltage signal stable.
Preferably, the step of first reference voltage signal is generated specifically includes：
The first reference voltage signal and first reference voltage signal are received, to produce comparison signal；
The comparison signal is received, to generate switch controlling signal；
The switch controlling signal is received, to control the connection shape of multiple current sources according to the multiple switch controlling signal
State, the voltage that the current source of connection is produced on divider resistance is as first reference voltage signal.
According to the control method of above-mentioned reference voltage source circuit and reference voltage, the first reference voltage generating circuit is produced
The reference voltage signal exported equal to bandgap voltage reference, when the system that it is applied enters holding state, then using first
The output voltage in reference voltage signal source as the reference voltage, and stop the work of bandgap voltage reference, so it may be such that
Under low power consumpting state, the small power consumption of system.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the reference voltage source according to the present invention；
Fig. 2 show a kind of implementation of logic circuit shown in Fig. 1；
Fig. 3 show a kind of implementation of the first reference voltage generating circuit shown in Fig. 1；
Fig. 4 show the working waveform figure according to the present invention.
Embodiment
Several preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to
These embodiments.The present invention covers any replacement, modification, equivalent method and side made in the spirit and scope of the present invention
Case.Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific thin
Section, and description without these details can also understand the present invention completely for a person skilled in the art.
As shown in figure 1, being a kind of reference voltage source circuit according to the present invention, the reference voltage source is used for any need
In the work system of reference voltage, in such as Switching Power Supply, reference voltage is provided for system.The present embodiment by taking Switching Power Supply as an example,
But it is not limited to the application to this.The reference voltage source circuit includes the reference voltage generating circuit of bandgap voltage reference 11 and first,
Here, first reference voltage generating circuit includes comparison circuit 12, logic circuit 13 and signal generating circuit 14.
The bandgap voltage reference 11 is to provide the first reference voltage signal VRef_b, here, the band-gap reference electricity
Potential source is existing in the prior art or improved circuit structure.
First reference voltage generating circuit is to provide the first reference voltage signal VRef_S, specifically, the comparison
Circuit 11 receives the first reference voltage signal VRef_bWith the first reference voltage signal VRef_S, to produce comparison signal Net_
C；The logic circuit 13 receives the comparison signal Net_C, to generate multiple switch control signal S0 ... SN；The signal life
The multiple switch controlling signal S0 ... SN is received into circuit 11, to control multiple electric currents according to the multiple switch controlling signal
The time that source is charged to charging capacitor, the both end voltage of charging capacitor is used as the first reference voltage signal VRef_S.Wherein, patrol
The physical circuit figure of volume circuit 13 and signal generating circuit 14 referring to figs. 2 and 3.
In the present invention, the first reference voltage signal VRef_SEqual to the first reference voltage signal VRef_b, it is necessary to say
Bright, the meaning for being equal to be approximately equal to here is the first reference voltage signal VRef_SIt can be slightly larger than, be equal to or slightly smaller
In the first reference voltage signal VRef_b.Also, when the Switching Power Supply is in normal operating conditions, then by described first
Reference voltage signal VRef_bThe Switching Power Supply is supplied as the output signal of the reference voltage source circuit to use；Opened when described
When powered-down source is in holding state, then by the first reference voltage signal VRef_SIt is used as the output of the reference voltage source circuit
Signal supplies the Switching Power Supply and used, and the bandgap voltage reference is stopped, and shown bandgap voltage reference passes through
Signal SD1 controls it to be stopped.
Here, as shown in figure 1, the reference voltage source circuit also includes triggers circuit, shown triggers circuit receives switch
The standby signal STDBY1 and comparison signal Net_C of power supply enable signal Enable and signal SD1 to produce.Shown triggers circuit
Specific work process will be described hereinafter.
According to above-mentioned circuit arrangement, when Switching Power Supply is in it is standby when, given birth to using less first reference voltage is lost
The benchmark of Switching Power Supply is provided into circuit, and stops the work of bandgap voltage reference, to reduce bandgap voltage reference
Produced power consumption, so as to reduce system power dissipation.
Specifically, showing a kind of implementation of the logic circuit according to the present invention with reference to Fig. 2, logic circuit 13 includes
(DFF1 is extremely for one-shot circuit 13-1, multiple delay circuits (delay 1 to delay N) and multiple switch control signal generative circuit
DFFN), the one-shot circuit 13-1 receives the comparison signal Net_C, the multiple to generate the first single pulse signal C1
First switch control signal DFF1 generative circuits in switch controlling signal generative circuit receive the first single pulse signal life
Into first switch control signal T1.
The multiple delay circuit (delay 1 to delay N) is sequentially connected in series, and first in the multiple delay circuit prolongs
(delay 1) receives the first single pulse signal C1 and comparison signal Net_C late, to generate the first postpones signal C2；Institute
Output signal and the comparison signal that the residual circuit in multiple delay circuits receives a delay circuit successively are stated, to generate
Multiple postpones signal C3 to C2N；Here, shown delay circuit can be the circuit structure by being constituted with door, timing circuit.
The residual circuit (DFF2 to DFFN) of the multiple switch controlling signal generative circuit receives the first delay letter
Number C2 and multiple postpones signal C3 to C2N, to generate corresponding multiple switch control signal T2 to T2N.Here, it is shown multiple to open
It can be the circuit structure being made up of triggers circuit (such as d type flip flop), timing circuit to close control signal generative circuit.
In the present embodiment, the multiple switch controlling signal generative circuit (DFF1 to DFFN) also receives the standby signal
STDBY1, when the standby signal, which characterizes the Switching Power Supply, is in normal operating conditions, then the multiple switch control is believed
Number it is changed into low level disarmed state.
Logic circuit 13 described in the present embodiment also connects including digit speech recognition circuit 13-2, the digit speech recognition circuit 13-2
Receive the multiple switch controlling signal T1 to T2N, current the multiple switch controlling signal is converted into binary system code table
The multiple switch control signal S0 to SN levied.In the present embodiment, thermometer code is changed to two by the digit speech recognition circuit 13-2
The circuit of code processed, the switch controlling signal T1 to T2NIt is that, with temperature representation, switch controlling signal S0 to SN is entered with two
Representation processed.
Here, it is necessary to explanation, when logic circuit 13 does not include digit speech recognition circuit, then multiple switch control signal
T1 to T2NI.e. as the output signal of logic circuit, itself and the S0 in Fig. 1 to SN sign switch controlling signals are same contain
Justice.
A kind of implementation of signal generating circuit 14 is shown with reference to Fig. 3, the signal generating circuit 14 includes described
Divider resistance R1 and R2, charging capacitor C1, multiple current sources (I0 to IN) and multiple switch pipe (S0 to SN)；The multiple electric current
(I0 to IN) is connected in parallel in source, and the multiple current source (I0 to IN) and the multiple switching tube (S0 to SN) series connection afterwards connects
Connect；The multiple switch controlling signal S0 to SN controls the on off state of the multiple switching tube respectively, corresponding to control
The on-state of current source, the multiple current source (I0 to IN) is connected with the divider resistance (R1 and R2), the charging
Electric capacity C1 and divider resistance (R1 and R2) are in parallel, and the voltage of end points is used as the described first ginseng in the middle of the divider resistance (R1 and R2)
Examine voltage signal VRef_S。
Here, the current value size of the multiple current source can be with identical or different.Also, when the multiple current source
When current value is of different sizes；According to the turn-on sequence of the switching tube of series connection with it, the current value of the multiple current source increases successively
Greatly.For example, when the turn-on sequence of switching tube is turned on from S0 to SN, then current source is increased successively from I0 to IN.In the present embodiment
Illustrate so that current source I0 increases successively to IN as an example, also, according to the relation of switch controlling signal, current source I0 in the present embodiment
To IN successively according to 20X to 2NX order increase.
The course of work of the invention is illustrated with reference to Fig. 1, Fig. 2, Fig. 3 and with reference to the oscillogram shown in Fig. 4：In this reality
Apply in example, so that logic circuit includes digit speech recognition circuit as an example.Before the t1 moment, Switching Power Supply is in normal operating conditions
In, then bandgap voltage reference is to provide the first reference voltage signal VRef_bThe output signal supply in source is opened as the reference voltage
Powered-down source is used.
To the t1 moment, Switching Power Supply enters holding state, and reference voltage source is receiving the standby signal of Switching Power Supply
STDBY1 is changed into after high level, then the enable signal Enable that triggers circuit is produced is changed into high level effective status (real work
In slightly postpone), comparison circuit (be specially comparator 12) enters working condition, then by the first reference voltage signal VRef_bWith
One reference voltage signal VRef_SIt is compared, at this moment due to the first reference voltage signal VRef_SIt is smaller, then the output of comparator
Signal Net_C is high level effective status.
The first single pulse signal C1 that one-shot circuit 13-1 in logic circuit 13 is produced is changed into high level effective status
(slightly postponing in real work), here, the first single pulse signal C1 of note are changed into high level effective status for the t2 moment, in practice
The time gap at t1 moment and t2 moment is very short.At this moment, the first switch that first switch control signal DFF1 generative circuits are produced
Control signal T1 is also changed into high level effective status therewith, and changing corresponding first switch control signal S0 by binary code becomes
For high level effective status, then first switch pipe S conductings, the first current source I0 is given by divider resistance R1 and R2 partial pressure, is obtained
The middle end-point voltage V of the divider resistance R1 and R2Ref_S, the first reference voltage signal VRef_SReached after rapid increase
It is stable.First delay circuit (delay 1) receives first single pulse signal C1 and comparison signal Net_C, when detecting the first simple venation
Rush signal C1 to be changed into the scheduled time after high level, such as from the t2 moment to the t3 moment, now, due to the first reference voltage letter
Number VRef_SStill less than the first reference voltage signal VRef_b, comparison signal Net_C is maintained as high level effective status, then and first
First postpones signal C2 of delay circuit output is changed into high level effective status, and corresponding second switch is changed by binary code
Control signal S1 is changed into high level effective status, then second switch pipe S1 is turned on, and the second current source I1, which gives, passes through divider resistance R1
Voltage, the first reference voltage signal V are obtained with R2Ref_SContinue to reach stabilization after rising, such as the oscillogram institute in Fig. 4
Show.
The like, then the 3rd switching tube S2 and the 4th switching tube S4 is turned on, the 3rd current source I2 and the 4th current source I3
Voltage is obtained also by divider resistance R1 and R2, as it was previously stated, in the present embodiment, the current source increases successively, therefore then
First reference voltage signal VRef_SIncrease also increasingly faster, using the control program of the embodiment of the present invention, can to use compared with
Few switching tube and current source, quickly reaches the reference voltage level of needs.
To the t5 moment, then the first reference voltage signal VRef_SRising has reached the first reference voltage signal VRef_b, typically
Ground, the first reference voltage signal V that the first reference voltage generating circuit is producedRef_SEqual to the base exported more than bandgap voltage reference
Quasi- the first reference voltage signal of voltage signal VRef_b.Comparator is changed into the invalid shape of low level in t6 moment its output signal Net_C
State, then the enable signal Enable of triggers circuit be also changed into low level disarmed state, comparator is stopped, triggers circuit output
Signal SD1 be changed into high level effective status, then bandgap voltage reference is stopped, correspondingly the first reference voltage signal
VRef_bRapid decrease, the first reference voltage signal VRef_SThen remain stable, and by the first reference voltage signal VRef_SIt is used as reference
The output voltage supply Switching Power Supply of voltage source is used.So far, then when completing from normal operating conditions to holding state, reference
The conversion of the output signal of voltage source, can be seen that because its resistance is few from the circuit diagram of the first reference voltage generating circuit, its
Power consumption in stand-by operation is very small, the far smaller than power consumption of bandgap voltage reference, so as to be conducive to whole system
Efficiency improve.
To the t7 moment, the holding state of Switching Power Supply is released, and standby signal STDBY1 is changed into low level, triggers circuit output
Signal SD1 be changed into low level effective status, then bandgap voltage reference start working, the first reference voltage signal VRef_bQuickly
Rise to the value of needs.Switching voltage source is by the first reference voltage signal VRef_bThe output voltage supply in source is opened as the reference voltage
Powered-down source is used.
Afterwards, to the t8 moment, low level is changed into standby signal STDBY1, Switching Power Supply is characterized and enters normal work shape
State, after some time is postponed, above-mentioned switch controlling signal is changed into low level disarmed state, then current source is all off,
First reference voltage signal VRef_SRapid decrease.
The first reference voltage signal is produced by the way that less first reference voltage generating circuit is lost, enters standby in system
During state, then using the output voltage in the first reference voltage signal source as the reference voltage, and stop bandgap voltage reference
Work, so may be such that under low power consumpting state, the loss of circuit is small.
Finally, the invention discloses a kind of control method of reference voltage, comprise the following steps：
The first reference voltage signal is provided according to bandgap voltage reference；
First reference voltage signal, the first reference voltage letter are produced according to the first reference voltage signal and standby signal
Number be more than or equal to first reference voltage signal；
The standby signal of reception system,
When the standby signal, which characterizes the system, is in normal operating conditions, then by first reference voltage signal
The system is supplied as referenced voltage to use；
When the standby signal, which characterizes the system, is in holding state, then using first reference voltage signal as
Reference voltage supplies the system and used, and the bandgap voltage reference is stopped.
Further, when the system enters holding state, first reference voltage signal gradually increases, until reaching
It is stable to holding during first reference voltage signal.
Further, the step of first reference voltage signal is generated specifically includes：
The first reference voltage signal and first reference voltage signal are received, to produce comparison signal；
The comparison signal is received, to generate switch controlling signal；
The switch controlling signal is received, to control the connection shape of multiple current sources according to the multiple switch controlling signal
State, the voltage that the current source of connection is produced on divider resistance is as first reference voltage signal.
The reference voltage source circuit and the control method of reference voltage according to the preferred embodiments of the present invention are carried out above
Detailed description, those of ordinary skill in the art can deduce other technologies or structure and circuit layout, element etc. accordingly
It can be applied to the embodiment.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, not yet
It is only described specific embodiment to limit the invention.Obviously, as described above, it can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, is in order to preferably explain the principle and practical application of the present invention, so that affiliated
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its four corner and equivalent.
Claims (11)
1. a kind of reference voltage source circuit, including bandgap voltage reference, it is characterised in that the reference voltage source circuit is also wrapped
The first reference voltage generating circuit is included,
The bandgap voltage reference is to provide the first reference voltage signal；
First reference voltage generating circuit receives first reference voltage signal and standby signal, to produce the first reference
Voltage signal, first reference voltage signal is equal to first reference voltage signal；
Wherein, the standby signal is to characterize whether system is in holding state, when the system is in holding state, then
First reference voltage signal is supplied into the system as the output signal of the reference voltage source circuit to use, and it is described
Bandgap voltage reference is stopped；
First reference voltage generating circuit includes comparison circuit, logic circuit and signal generating circuit,
The comparison circuit receives the first reference voltage signal and first reference voltage signal, to produce comparison signal；
The logic circuit receives the comparison signal, to generate multiple switch control signal；
The signal generating circuit receives the multiple switch controlling signal, many to be controlled according to the multiple switch controlling signal
The on-state of individual current source, the voltage that the current source of connection is produced on divider resistance is believed as first reference voltage
Number.
2. reference voltage source circuit according to claim 1, it is characterised in that when the system enters holding state,
First reference voltage signal gradually increases, until being kept when reaching first reference voltage signal stable.
3. reference voltage source circuit according to claim 1, it is characterised in that when the system enters holding state,
The comparison circuit enters working condition, when first reference voltage signal reaches first reference voltage signal, institute
Comparison circuit is stated to be stopped.
4. reference voltage source circuit according to claim 1, it is characterised in that the logic circuit includes pulse electricity
Road, multiple delay circuits and multiple switch control signal generative circuit,
The one-shot circuit receives the comparison signal, to generate the first single pulse signal, the multiple switch controlling signal
First switch control signal generative circuit in generative circuit receives the first single pulse signal generation first switch control letter
Number；
The multiple delay circuit is sequentially connected in series, and the first delay in the multiple delay circuit receives first simple venation
Signal and the comparison signal are rushed, to generate the first postpones signal；Residual circuit in the multiple delay circuit is received successively
The output signal and the comparison signal of a upper delay circuit, to generate multiple postpones signals；
The residual circuit of the multiple switch controlling signal generative circuit receives first postpones signal and multiple postpones signals,
To generate corresponding multiple switch control signal.
5. reference voltage source circuit according to claim 4, it is characterised in that the multiple switch controlling signal generation electricity
Road also receives the standby signal, when the standby signal, which characterizes the system, is in normal operating conditions, then the multiple
Switch controlling signal is changed into low level disarmed state.
6. reference voltage source circuit according to claim 5, it is characterised in that the logic circuit also includes digit speech recognition
Circuit,
The digit speech recognition circuit receives the multiple switch controlling signal, and current the multiple switch controlling signal is turned
It is changed to the multiple switch control signal of binary code sign.
7. the reference voltage source circuit according to claim 4 or 6, it is characterised in that the signal generating circuit includes institute
State divider resistance, charging capacitor, multiple current sources and multiple switch pipe；
The multiple current source is connected in parallel, and multiple current sources and corresponding the multiple switching tube are connected in series；
The multiple switch controlling signal controls the on off state of the multiple switching tube respectively, to control corresponding current source
On-state；
The multiple current source is connected with the divider resistance, and the charging capacitor and the divider resistance are in parallel, described point
The voltage of end points is used as first reference voltage signal in the middle of piezoresistance.
8. reference voltage source circuit according to claim 7, it is characterised in that the current value size of the multiple current source
It is identical or different.
9. reference voltage source circuit according to claim 8, it is characterised in that when the current value of the multiple current source is big
When small different；
According to the turn-on sequence of the switching tube of series connection with it, the current value of the multiple current source increases successively.
10. a kind of control method of reference voltage, it is characterised in that comprise the following steps：
The first reference voltage signal is provided according to bandgap voltage reference；
First reference voltage signal is produced according to the first reference voltage signal and standby signal, first reference voltage signal is big
In equal to first reference voltage signal；
The standby signal of reception system,
When the standby signal, which characterizes the system, is in normal operating conditions, then using first reference voltage signal as
Reference voltage supplies the system and used；
When the standby signal, which characterizes the system, is in holding state, then first reference voltage signal is regard as reference
Voltage supplies the system and used, and the bandgap voltage reference is stopped；
The step of first reference voltage signal is generated specifically includes：
The first reference voltage signal and first reference voltage signal are received, to produce comparison signal；
The comparison signal is received, to generate multiple switch control signal；
The multiple switch controlling signal is received, to control the connection shape of multiple current sources according to the multiple switch controlling signal
State, the voltage that the current source of connection is produced on divider resistance is as first reference voltage signal.
11. the control method of reference voltage according to claim 10, it is characterised in that enter standby shape in the system
During state, first reference voltage signal gradually increases, until being kept when reaching first reference voltage signal stable.
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| ITMI20112268A1 (en) * | 2011-12-15 | 2013-06-16 | St Microelectronics Des & Appl | VOLTAGE-CURRENT SENSING CIRCUIT AND RELATED DC-DC CONVERTER |
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Address after: 310051 No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. Address before: 310012 room A1501, science and Technology Park, East Software Park, No. 90, Wensanlu Road, Zhejiang, China Patentee before: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. |
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