CN104820458B - A kind of voltage regulator circuit, power supervisor and display unit - Google Patents
A kind of voltage regulator circuit, power supervisor and display unit Download PDFInfo
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Abstract
The invention discloses a kind of voltage regulator circuit, power supervisor and display unit, not only comprise: the first reference signal end, signal output part, be connected on the first resistance and the second resistance between signal output part and the first reference signal end and be connected to the first resistance and the second resistance between the second reference signal end, also comprise: be connected in parallel on the first resistance two ends secondary voltage regulate electronic circuit. Because regulating electronic circuit, secondary voltage in above-mentioned voltage regulator circuit can pass through the resistance between conditioning signal output and the first reference signal end, after making the voltage of signal output part first become buffer voltagc, become again target voltage, even if the voltage of signal output part reaches target voltage after changing by two-stage step, thereby avoided in existing voltage regulator circuit, the voltage of signal output part just directly rises to the problem of target voltage after of short duration climbing.
Description
Technical field
The present invention relates to electronic technology field, espespecially a kind of voltage regulator circuit, power supervisor and display unit.
Background technology
Its input voltage of current display floater is all generally a fixing voltage, but display floater will be justNormal work, circuit modules different in display floater but need different operating voltages. Therefore, display surfacePlate generally passes through power supervisor (PowerManagementIC, PMIC) according to different circuit modulesInput voltage is carried out to dividing potential drop, be divided into different target voltages, for example AVDD, DVDD, VON, VOFFDeng, to drive circuit modules different in display floater normally to work.
Therefore in power supervisor, multiple voltage regulator circuits have been generally comprised, each voltage regulator circuitBe used for exporting a target voltage. Particularly, the structure of existing voltage regulator circuit as shown in Figure 1a,Comprise: the first reference signal end Vref1, signal output part Vout, be connected on signal output part Vout andThe first resistance R 1 between one reference signal end Vref1 and the second resistance R 2 and be connected to the first resistanceThe second reference signal end Vref2 between R1 and the second resistance R 2. In this voltage regulator circuit, signalThe voltage of output end vo ut: Vout＝Vref2–(Vref1-Vref2) × (R1/R2), wherein VoutFor signal outputThe voltage of end Vout, wherein Vref1Be the voltage of the first reference signal end Vref1, wherein Vref2Be secondThe voltage of reference signal end Vref2. For different voltage regulator circuits, Vref1And Vref2Generally there is oneselfFixing value, therefore, this voltage regulator circuit can be according to the ratio that regulates the first resistance and the second resistance,Comparatively accurately export target voltage.
But above-mentioned voltage regulator circuit, in the process of display floater start, as shown in Figure 1 b, signalThe voltage V of output end vo utoutAfter of short duration climbing, directly rise to target voltage, hypothetical target voltage is8V. Thereby can make display floater can produce a larger immediate current in the time of start, and then cause showingThe electric field of panel inside sharply changes, and makes display floater produce many harmful effects.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of voltage regulator circuit, power supervisor and demonstrationInstall, avoid of short duration the climbing of voltage process of the signal output part of voltage regulator circuit for solving prior artAfter rising, just directly rise to the problem of target voltage.
Therefore, the embodiment of the present invention provides a kind of voltage regulator circuit, comprising: the first reference signal end,Signal output part, be connected on the first resistance between described signal output part and described the first reference signal end andThe second resistance and be connected to described the first resistance and described the second resistance between the second reference signal end;Also comprise: the secondary voltage that is connected in parallel on described the first resistance two ends regulates electronic circuit; Wherein,
Described secondary voltage regulates electronic circuit to be used for, at described the first reference signal end and described the second reference letterIn number Preset Time of end after input signal, make the voltage of described signal output part become buffer voltagc; DescribedAfter Preset Time, regulate the resistance between described signal output part and described the first reference signal end, make instituteThe voltage of stating signal output part becomes target voltage from described buffer voltagc, and keeps described target voltage, itsIn, described target voltage is not equal to described buffer voltagc.
Particularly, in the specific implementation, in the foregoing circuit providing in the embodiment of the present invention, described the first electricityOne end of resistance is connected with described signal output part, one end of described the second resistance and described the first reference signal endBe connected; Or
One end of described the second resistance is connected with described signal output part, one end of described the first resistance with described inThe first reference signal end is connected.
In a kind of possible embodiment, in the foregoing circuit providing in the embodiment of the present invention, described secondaryVoltage-regulation electronic circuit, specifically comprises: the 3rd resistance, on-off controller and time delay module; Wherein,
One end of described the 3rd resistance is connected with one end of described the first resistance, the other end of described the 3rd resistanceBe connected with the other end of described the first resistance by described on-off controller;
The control end of described on-off controller is connected with described time delay module;
Described time delay module, for believing at described the first reference signal end and described the second reference signal end inputIn Preset Time after number, control described on-off controller in cut-off state; After described Preset Time,Control described on-off controller in conducting state.
In a kind of possible embodiment, in the foregoing circuit providing in the embodiment of the present invention, describedTime delay module, specifically comprises: the 4th resistance, electric capacity, signal input part and control signal output; Wherein,
Described control signal output respectively with one of the control end of described on-off controller, described the 4th resistanceOne end of end and described electric capacity is connected, and the other end of described the 4th resistance is connected with described signal input part,The other end ground connection of described electric capacity.
In a kind of possible embodiment, in the foregoing circuit providing in the embodiment of the present invention, described switchController is switching transistor.
Particularly, in the specific implementation, in the foregoing circuit providing in the embodiment of the present invention, described switch crystalline substanceBody pipe is N-type transistor or P transistor npn npn.
Correspondingly, the embodiment of the present invention also provides a kind of power supervisor, comprises that at least one the present invention is realExecute the above-mentioned voltage regulator circuit that example provides.
Correspondingly, the embodiment of the present invention also provides a kind of display unit, comprises what the embodiment of the present invention providedAbove-mentioned power supervisor.
Above-mentioned voltage regulator circuit, power supervisor and display unit that the embodiment of the present invention provides, not only bagDraw together: the first reference signal end, signal output part, be connected between signal output part and the first reference signal endThe first resistance and the second resistance and be connected to the first resistance and the second resistance between the second reference signalEnd, also comprises: the secondary voltage that is connected in parallel on the first resistance two ends regulates electronic circuit; This secondary voltage regulates sonCircuit is used for, and in the Preset Time after the first reference signal end and the second reference signal end input signal, makesThe voltage of signal output part becomes buffer voltagc; After Preset Time, conditioning signal output and the first referenceResistance between signal end, makes the voltage of signal output part become target voltage from buffer voltagc, and keeps orderMark voltage, wherein, target voltage is not equal to buffer voltagc. Just because of secondary in above-mentioned voltage regulator circuitVoltage-regulation electronic circuit can, by the resistance between conditioning signal output and the first reference signal end, make letterAfter first becoming buffer voltagc, the voltage of number output becomes again target voltage, even if the voltage of signal output part is logicalCross after two-stage step changes and reach target voltage, thereby avoided in existing voltage regulator circuit, signal outputThe voltage of end just directly rises to the problem of target voltage after of short duration climbing.
Brief description of the drawings
Fig. 1 a is the circuit diagram of existing voltage regulator circuit;
Fig. 1 b is that the voltage of the signal output part of the voltage regulator circuit shown in Fig. 1 a reaches showing of target voltageIntention;
Fig. 2 a and Fig. 2 b are respectively the structural representation of the voltage regulator circuit that the embodiment of the present invention provides;
Fig. 2 c is that the voltage of the signal output part of the voltage regulator circuit shown in Fig. 2 a and Fig. 2 b reaches targetThe schematic diagram of voltage;
Fig. 3 a to Fig. 3 d is respectively the concrete structure signal of the voltage regulator circuit that the embodiment of the present invention providesFigure.
Detailed description of the invention
Below in conjunction with accompanying drawing, a kind of voltage regulator circuit that the embodiment of the present invention is provided, power supervisor withAnd the detailed description of the invention of display unit is described in detail.
A kind of voltage regulator circuit that the embodiment of the present invention provides, as shown in Figure 2 a and 2 b, comprising: theOne reference signal end Vref1, signal output part Vout, be connected on signal output part Vout and first with reference to letterNumber end the first resistance R 1 and the second resistance R 2 between Vref1 and be connected to the first resistance R 1 and theThe second reference signal end Vref2 between two resistance R 2; Also comprise: be connected in parallel on first resistance R 1 two endsSecondary voltage regulates electronic circuit 1; Wherein,
Circuit input and output sequential chart as shown in Figure 2 c, this secondary voltage regulate electronic circuit 1 for,In preset time T 1 after the first reference signal end Vref1 and the second reference signal end Vref2 input signal,Make the voltage of signal output part Vout become buffer voltagc V1; After preset time T 1, conditioning signal is defeatedGo out to hold the resistance between Vout and the first reference signal end Vref1, make the voltage V of signal output part VoutoutBecome target voltage V2 from buffer voltagc V1, and keep this target voltage V2, wherein, target voltage V2Be not equal to buffer voltagc V1.
The above-mentioned voltage regulator circuit that the embodiment of the present invention provides, not only comprises: the first reference signal end, letterNumber output, be connected on the first resistance between signal output part and the first reference signal end and the second resistance,And be connected to the second reference signal end between the first resistance and the second resistance, also comprise: be connected in parallel on firstThe secondary voltage at resistance two ends regulates electronic circuit; This secondary voltage regulates electronic circuit to be used for, at the first reference letterNumber end and the second reference signal end input signal after Preset Time in, make the voltage of signal output part become slowRush voltage; After Preset Time, the resistance between conditioning signal output and the first reference signal end, makes letterThe voltage of number output becomes target voltage from buffer voltagc, and keeps target voltage, wherein, and target voltageBe not equal to buffer voltagc. Regulate electronic circuit to pass through just because of secondary voltage in above-mentioned voltage regulator circuitResistance between conditioning signal output and the first reference signal end, makes the voltage of signal output part first become slowAfter rushing voltage, become again target voltage, even if the voltage of signal output part reaches order after changing by two-stage stepMark voltage, thus avoid in existing voltage regulator circuit, and the voltage of signal output part is after of short duration climbingJust directly rise to the problem of target voltage.
Particularly, in the specific implementation, in the above-mentioned voltage regulator circuit providing in the embodiment of the present invention, asShown in Fig. 2 a, one end of the first resistance R 1 is connected with signal output part Vout, one end of the second resistance R 2Be connected with the first reference signal end Vref1, secondary voltage regulates electronic circuit 1 to be connected near signal outputOn the resistance of end Vout; Or
As shown in Figure 2 b, one end of the second resistance R 2 is connected with signal output part Vout, the first resistance R 1One end be connected with the first reference signal end Vref1, secondary voltage regulates electronic circuit 1 to be connected near firstOn the resistance of reference signal end Vref1.
Below in conjunction with specific embodiment, the present invention is described in detail. It should be noted that the present embodimentBe all in order better to explain the present invention, but do not limit the present invention.
Particularly, in the specific implementation, in the above-mentioned voltage regulator circuit providing in the embodiment of the present invention, asShown in Fig. 3 a and Fig. 3 d, secondary voltage regulates electronic circuit 1, specifically can comprise: the 3rd resistance R 3, openGateway controller 11 and time delay module 12; Wherein,
One end of the 3rd resistance R 3 is connected with one end of the first resistance R 1, and the other end of the 3rd resistance R 3 is logicalCrossing on-off controller 11 is connected with the other end of the first resistance R 1;
The control end of on-off controller 11 is connected with time delay module 12;
Time delay module 12, for inputting at the first reference signal end Vref1 and the second reference signal end Vref2In Preset Time after signal, gauge tap controller 11 is in cut-off state, after Preset Time,Gauge tap controller 11 is in conducting state. Like this when time delay module 12 gauge tap controller 11 placesIn the time of conducting state, the 3rd resistance R 3 is in parallel with the first resistance R 1, thus by signal output part Vout withResistance between the first reference signal end Vref1 is adjusted into after Preset Time by the R1+R2 in Preset Time(R1 × R3)/(R1+R3)+R2, and then the voltage of change conditioning signal output end vo ut by resistance.
Particularly, in the specific implementation, in the above-mentioned voltage regulator circuit providing in the embodiment of the present invention, asShown in Fig. 3 a and Fig. 3 b, when the first resistance R 1 is during near signal output part Vout, as shown in Figure 3 a,One end of the 3rd resistance R 3 can be connected between the first resistance R 1 and the second resistance R 2, the 3rd resistanceThe other end of R3 is connected with one end of on-off controller 11, and the other end and the signal of on-off controller 11 are defeatedGo out to hold Vout to be connected; Or as shown in Figure 3 b, one end of on-off controller 11 can be connected to firstBetween resistance R 1 and the second resistance R 2, one end of the other end of on-off controller 11 and the 3rd resistance R 3Be connected, the other end of the 3rd resistance R 3 is connected with signal output part Vout; In this no limit.
Correspondingly, in the specific implementation, in the above-mentioned voltage regulator circuit providing in the embodiment of the present invention, asShown in Fig. 3 c and Fig. 3 d, when the first resistance R 1 is during near the first reference signal end Vref1, as Fig. 3 c instituteShow, one end of the 3rd resistance R 3 can be connected between the first resistance R 1 and the second resistance R 2, the 3rd electricityThe other end of resistance R3 is connected with one end of on-off controller 11, the other end of on-off controller 11 and firstReference signal end Vref1 is connected; Or as shown in Figure 3 d, one end of on-off controller 11 can connectBetween the first resistance R 1 and the second resistance R 2, the other end of on-off controller 11 and the 3rd resistance R 3One end be connected, the other end of the 3rd resistance R 3 is connected with the first reference signal end Vref1; Do not do at thisLimit.
Below be only the concrete structure that illustrates secondary voltage adjusting electronic circuit, in the specific implementation, secondaryThe concrete structure of voltage-regulation electronic circuit is not limited to the said structure that the embodiment of the present invention provides, and can also be thisOther structures that those skilled in the art are known, do not limit at this.
Preferably, in the above-mentioned voltage regulator circuit providing in the embodiment of the present invention, as Fig. 3 a to Fig. 3 d instituteShow that time delay module 12 specifically can comprise: the 4th resistance R 4, capacitor C, signal input part Vin andControl signal output Vc; Wherein,
Control signal output Vc respectively with one end of the control end of on-off controller 11, the 4th resistance R 4,And one end of capacitor C 4 is connected, the other end of the 4th resistance R 4 is connected with signal input part Vin, electric capacityThe other end ground connection of C.
Need explanation time, in the time that time delay module is made up of above-mentioned the 4th resistance and electric capacity, the charging of this electric capacityDuration is just above-mentioned Preset Time, like this when signal input part and the first reference signal end and the second reference letterNumber end has signal when input simultaneously, in Preset Time, and because electric capacity is also in charged state, switch controlDevice is in cut-off state, and the 3rd resistance and the first resistance is in cut-off state, therefore signal output part and firstResistance value between reference signal end is R1+R2, and when after Preset Time, electric capacity is full of electricity, switch controlDevice is in conducting state, and the 3rd resistance is in parallel with the first resistance, therefore signal output part and the first reference signalResistance value between end becomes (R1 × R3)/(R1+R3)+R2.
Below be only the concrete structure that illustrates time delay module, in the specific implementation, time delay module concreteStructure is not limited to the said structure that the embodiment of the present invention provides, and can also be known its of those skilled in the artHis structure, does not limit at this.
Preferably, in the specific implementation, in the above-mentioned voltage regulator circuit providing in the embodiment of the present invention, asShown in Fig. 3 a to Fig. 3 d, on-off controller 11 can be switching transistor M. Further, this switchTransistor M can be N-type transistor, or can be also P transistor npn npn, in this no limit.
It should be noted that the switching transistor of mentioning in the above embodiment of the present invention can be thin film transistor (TFT)(TFT, ThinFilmTransistor), can be also metal oxide semiconductor field effect tube (MOS,MetalOxideScmiconductor), do not limit at this.
As an example of the voltage regulator circuit shown in Fig. 3 a and Fig. 3 c example, the embodiment of the present invention is provided respectively belowThe course of work of voltage regulator circuit is done to describe.
Example one:
As an example of the structure of the voltage regulator circuit shown in Fig. 3 a example, its course of work is done to describe, particularly,When the first reference signal end Vref1, the second reference signal end Vref2, signal input part Vin all have signal defeatedFashionable:
In Preset Time, capacitor C starts charging, and switching transistor M is in cut-off state, and therefore theBetween one reference signal end Vref1 and signal output part Vout, only have the first resistance R 1 and the second resistance R 2Conducting, between the first reference signal end Vref1 and signal output part Vout, all-in resistance is just R1+R2. FalseIf the voltmeter of the first reference signal end Vref1 is shown Vref1, the voltmeter of the second reference signal end Vref2Be shown Vref2, the voltage of signal output part Vout represents Vout, in this stage, according to formula (Vref1-Vref2)/R2＝(Vref2-Vout)/R1 can learn, the voltage of signal output part Vout becomes V from zeroout＝Vref2–(Vref1-Vref2) × (R1/R2), this magnitude of voltage is buffer voltagc. Therefore, in Preset Time, bufferingThe size of voltage is determined by the ratio of the first resistance and the second resistance.
After Preset Time, capacitor C is full of electricity, and switching transistor M is in conducting state, and thereforeBetween one reference signal end Vref1 and signal output part Vout, only have the first resistance R 1, the second resistance R 2Conducting and the 3rd resistance R 3 conductings, total electricity between the first reference signal end Vref1 and signal output part VoutResistance just becomes (R1 × R3)/(R1+R3)+R2. In like manner according to formula (Vref1-Vref2)/R2＝(Vref2-Vout)/[(R1× R3)/(R1+R3)] can learn, the voltage of signal output part Vout becomes target voltage from buffer voltagc:Vout＝Vref2–(Vref1-Vref2) (R1 × R3)/[(R1+R3) × R2], and keep this target voltage, therefore in advanceIf in the time, the size of target voltage by the ratio between the first resistance, the second resistance and the 3rd resistance certainlyFixed.
Above-mentioned voltage regulator circuit regulates electronic circuit conditioning signal output and the first reference by secondary voltageResistance between signal end, becomes target voltage after making the voltage of signal output part first become buffer voltagc again,Even if the voltage of signal output part reaches target voltage after changing by two-stage step, thereby has avoided existing electricityIn voltage regulator circuit, the voltage of signal output part just directly rises to asking of target voltage after of short duration climbingTopic.
Example two:
As an example of the structure of the voltage regulator circuit shown in Fig. 3 c example, its course of work is done to describe, particularly,When the first reference signal end Vref1, the second reference signal end Vref2, signal input part Vin all have signal defeatedFashionable:
In Preset Time, capacitor C starts charging, and switching transistor M is in cut-off state, and therefore theBetween one reference signal end Vref1 and signal output part Vout, only have the first resistance R 1 and the second resistance R 2Conducting, between the first reference signal end Vref1 and signal output part Vout, all-in resistance is just R1+R2. FalseIf the voltmeter of the first reference signal end Vref1 is shown Vref1, the voltmeter of the second reference signal end Vref2Be shown Vref2, the voltage of signal output part Vout represents Vout, in this stage, according to formula (Vref1-Vref2)/R1＝(Vref2-Vout)/R2 can learn, the voltage of signal output part Vout becomes V from zeroout＝Vref2–(Vref1-Vref2) × (R2/R1), this magnitude of voltage is buffer voltagc. Therefore, in Preset Time, bufferingThe size of voltage is determined by the ratio of the first resistance and the second resistance.
After Preset Time, capacitor C is full of electricity, and switching transistor M is in conducting state, and thereforeBetween one reference signal end Vref1 and signal output part Vout, only have the first resistance R 1, the second resistance R 2Conducting and the 3rd resistance R 3 conductings, total electricity between the first reference signal end Vref1 and signal output part VoutResistance just becomes (R1 × R3)/(R1+R3)+R2. In like manner according to formula (Vref1-Vref2)/[(R1×R3)/(R1+R3)]＝(Vref2-Vout)/R2 can learn, the voltage of signal output part Vout becomes target voltage from buffer voltagcVout＝Vref2–(Vref1-Vref2) × R2/[(R1 × R3)/(R1+R3)], and keep this target voltage, therefore in advanceIf in the time, the size of target voltage by the ratio between the first resistance, the second resistance and the 3rd resistance certainlyFixed.
Above-mentioned voltage regulator circuit regulates electronic circuit conditioning signal output and the first reference by secondary voltageResistance between signal end, becomes target voltage after making the voltage of signal output part first become buffer voltagc again,Even if the voltage of signal output part reaches target voltage after changing by two-stage step, thereby has avoided existing electricityIn voltage regulator circuit, the voltage of signal output part just directly rises to asking of target voltage after of short duration climbingTopic.
Based on same inventive concept, the embodiment of the present invention also provides a kind of display device, comprises that the present invention is realExecute the above-mentioned electrostatic protection system that example provides, because principle and aforementioned one that this display device is dealt with problems are quietElectric protection system is similar, and therefore the enforcement of this display device can be referring to the enforcement of aforementioned electrostatic protection system,Repetition part repeats no more.
Based on same inventive concept, the embodiment of the present invention also provides a kind of display unit, comprises that the present invention is realExecute above-mentioned any display device that example provides. This display unit can be: mobile phone, panel computer, TVMachine, display, notebook computer, DPF, navigator etc. are any have Presentation Function product orParts. The enforcement of this display unit can, referring to the embodiment of above-mentioned display floater, repeat part no longer superfluousState.
A kind of voltage regulator circuit, power supervisor and display unit that the embodiment of the present invention provides, not only bagDraw together: the first reference signal end, signal output part, be connected between signal output part and the first reference signal endThe first resistance and the second resistance and be connected to the first resistance and the second resistance between the second reference signalEnd, also comprises: the secondary voltage that is connected in parallel on the first resistance two ends regulates electronic circuit; This secondary voltage regulates sonCircuit is used for, and in the Preset Time after the first reference signal end and the second reference signal end input signal, makesThe voltage of signal output part becomes buffer voltagc; After Preset Time, conditioning signal output and the first referenceResistance between signal end, makes the voltage of signal output part become target voltage from buffer voltagc, and keeps orderMark voltage, wherein, target voltage is not equal to buffer voltagc. Just because of secondary in above-mentioned voltage regulator circuitVoltage-regulation electronic circuit can, by the resistance between conditioning signal output and the first reference signal end, make letterAfter first becoming buffer voltagc, the voltage of number output becomes again target voltage, even if the voltage of signal output part is logicalCross after two-stage step changes and reach target voltage, thereby avoided in existing voltage regulator circuit, signal outputThe voltage of end just directly rises to the problem of target voltage after of short duration climbing.
Obviously, those skilled in the art can carry out various changes and modification and not depart from this present inventionBright spirit and scope. Like this, if of the present invention these amendment and modification belong to the claims in the present invention andWithin the scope of its equivalent technologies, the present invention be also intended to comprise these change and modification interior.
Claims (8)
1. a voltage regulator circuit, comprising: the first reference signal end, signal output part, be connected on instituteState the first resistance and the second resistance between signal output part and described the first reference signal end and be connected toThe second reference signal end between described the first resistance and described the second resistance; It is characterized in that, also comprise:The secondary voltage that is connected in parallel on described the first resistance two ends regulates electronic circuit; Wherein,
Described secondary voltage regulates electronic circuit to be used for, at described the first reference signal end and described the second reference letterIn number Preset Time of end after input signal, make the voltage of described signal output part become buffer voltagc; DescribedAfter Preset Time, regulate the resistance between described signal output part and described the first reference signal end, make instituteThe voltage of stating signal output part becomes target voltage from described buffer voltagc, and keeps described target voltage, itsIn, described target voltage is not equal to described buffer voltagc.
2. voltage regulator circuit as claimed in claim 1, is characterized in that, one of described the first resistanceEnd is connected with described signal output part, and one end of described the second resistance is connected with described the first reference signal end;Or
One end of described the second resistance is connected with described signal output part, one end of described the first resistance with described inThe first reference signal end is connected.
3. voltage regulator circuit as claimed in claim 2, is characterized in that, described secondary voltage regulatesElectronic circuit, specifically comprises: the 3rd resistance, on-off controller and time delay module; Wherein,
One end of described the 3rd resistance is connected with one end of described the first resistance, the other end of described the 3rd resistanceBe connected with the other end of described the first resistance by described on-off controller;
The control end of described on-off controller is connected with described time delay module;
Described time delay module, for believing at described the first reference signal end and described the second reference signal end inputIn Preset Time after number, control described on-off controller in cut-off state; After described Preset Time,Control described on-off controller in conducting state.
4. voltage regulator circuit as claimed in claim 3, is characterized in that, described time delay module, toolBody comprises: the 4th resistance, electric capacity, signal input part and control signal output; Wherein,
Described control signal output respectively with one of the control end of described on-off controller, described the 4th resistanceOne end of end and described electric capacity is connected, and the other end of described the 4th resistance is connected with described signal input part,The other end ground connection of described electric capacity.
5. voltage regulator circuit as claimed in claim 3, is characterized in that, described on-off controller isSwitching transistor.
6. voltage regulator circuit as claimed in claim 5, is characterized in that, described switching transistor isN-type transistor or P transistor npn npn.
7. a power supervisor, is characterized in that, comprises that at least one is as claim 1-6 any oneDescribed voltage regulator circuit.
8. a display unit, is characterized in that, comprises power supervisor as claimed in claim 7.
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