CN1740937A - Regulator circuit capable of detecting variations in voltage - Google Patents
Regulator circuit capable of detecting variations in voltage Download PDFInfo
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- CN1740937A CN1740937A CN 200510087564 CN200510087564A CN1740937A CN 1740937 A CN1740937 A CN 1740937A CN 200510087564 CN200510087564 CN 200510087564 CN 200510087564 A CN200510087564 A CN 200510087564A CN 1740937 A CN1740937 A CN 1740937A
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Abstract
To suppress a variation in output voltage upon occurrence of a variation in input voltage or output current without any increase in steady-state power consumption, in a regulator circuit. A regulator circuit 100 includes a detection circuit 20 and an auxiliary circuit 30 in addition to an error amplifier 10, an output transistor 12, a first resistor R1, a second resistor R2, and a reference voltage source 14. The error amplifier 10, the output transistor 12, the first resistor R1, and the second resistor R2 form a typical linear regulator. The detection circuit 20 includes a detecting capacitor C1, a first transistor M1, and a gain control resistor R3, which are serially connected between an input terminal 102 and a ground terminal. A variation in input voltage leads to a change in potential at one end of the detecting capacitor C1 in accordance with an input voltage Vin, and a transient detecting current Idec transiently flows to allow detection of a voltage variation. The detecting current Idet is amplified in the auxiliary circuit 30, and a feedback current Ifd is fed back to a gate terminal of the output transistor 12.
Description
Technical field
The present invention relates to the adjuster circuit of the voltage of input is stable and output.
Background technology
For electronic circuit is stably moved, its supply voltage to be stabilized to certain value sometimes.In addition, the needed supply voltage of each electronic circuit might not be configured in the equipment that loads electronic circuit.For example, the 5V microcomputer of mobile unit etc. need 5V as supply voltage, and the voltage that the battery of automobile is supplied with is 12V, and unstable.In this case, also stably generate the needed supply voltage of electronic circuit, extensively adopt adjuster circuit for simple.
Usually, this adjuster circuit comprises error amplifier and output transistor and feedback resistance.Relatively by the output voltage and the desired reference voltage value of feedback resistance feedback, the voltage of the control terminal of control output transistor is so that two voltages are approaching for error amplifier.Thus, under the situation of input voltage or load change, must make the change in voltage of the control terminal of output transistor according to this change.
At this,,, use MOSFET (Metal OxideSemiconductor Field Effect Transistor) sometimes for current sinking is low as output transistor.Using under the situation of MOSFET,, then following in this and the grid capacitance quantitative change is big if transistor size is increased in order to obtain big electric current tolerance, slow by the response of the grid voltage of error amplifier control for the change of input voltage or load.This slow overshoot (overshoot) or following dash (undershoot) that causes output voltage.In addition, be output current when change at load change, also take place overshoot or under dash.
In order to solve such problem, following method is proposed: monitor the electric current that flows to load from output transistor,, accelerate the response speed of regulator thus according to the bias current of this electric current increase error amplifier.
[patent documentation 1] spy opens 2001-34351 communique (Japan)
During the technology in adopting above-mentioned document, put down in writing, in load, flow through under the situation of a lot of electric currents, also flow through big bias current, response speed high speed in the error amplifier.But, when the electric current that flows through in load sharply reduces, therewith together and response speed is slack-off, therefore, probably output current change.In addition, be difficult to suppress to result from the change of output voltage of the change of input voltage.
Summary of the invention
The present invention is the invention in view of above situation, and its purpose is to provide a kind of adjuster circuit, the consumption electric power in the steady state (SS) is increased, the change of the output voltage in the time of can suppressing the change of input voltage or output current.
In order to solve above-mentioned problem, the adjuster circuit of a kind of mode of the present invention comprises: output transistor is arranged between input terminal and lead-out terminal; Error amplifier, the voltage of the control terminal of adjusting output transistor is so that the output voltage that presents on the lead-out terminal is near desired magnitude of voltage; Testing circuit, the variation in voltage of the detection terminal that current potential should be stable in order to make output voltage stabilization; And auxiliary circuit, when detecting variation in voltage, forcibly make the change in voltage of the control terminal of output transistor by testing circuit.
' control terminal of output transistor ' is at MOSFET middle finger gate terminal, at bipolar transistor middle finger base terminal.In addition, the terminal that ' terminal that voltage should be stable in order to make output voltage stabilization ' refers to when circuit is in steady state (SS), its magnitude of voltage is stabilized in certain value except input voltage etc., also comprises output voltage.
According to this mode because the only action during variation in voltage transiently of testing circuit and auxiliary circuit, so, do not increase the current sinking of circuit when steady state (SS), can suppress overshoot or under dash, but regulated output voltage.
Testing circuit comprises the detection container that is arranged between the fixing terminal of terminal that current potential should be stable and current potential, thus current potential should be stable the variation in voltage of terminal the time to monitor that the electric current that flows through transiently in the detection container detects variation in voltage also passable.' being arranged between terminal ' also comprises via resistance or transistor and situation about connecting except the situation that is directly connected to two terminals.
When circuit is in steady state (SS) because the voltage at the two ends of detection container be certain, so electric current do not flow through, if but input voltage or output voltage fluctuation, then owing to the potential change of one end, so the transition current that is used to discharge and recharge flows through.Testing circuit can detect variation in voltage by monitoring this transition current.
Auxiliary circuit amplifies the electric current that flows through transiently in the detection container, and the control terminal by the current supply output transistor after will amplifying forcibly makes the voltage rising of this control terminal also passable.
Output transistor is that grid capacitance is recharged under the situation of MOSFET, and under the situation of bipolar transistor, is used to make the base current of transistor turns to change.Its result forcibly makes grid voltage or base voltage rise, and can suppress output voltage fluctuation well, particularly suppresses overshoot.' electric current is amplified ' except the situation that makes the current value increase, also comprises the situation that makes its minimizing.
In addition, auxiliary circuit amplifies the electric current that flows through transiently in the detection container, draws and forcibly makes the voltage decline of this control terminal also passable from the control terminal of output transistor by the electric current after will amplifying.Under this situation, can suppress output voltage fluctuation well, particularly dash down.
Other modes of the present invention also are adjuster circuits.This adjuster circuit comprises: output transistor is arranged between input terminal and lead-out terminal; Error amplifier, the voltage of the control terminal of adjusting output transistor is so that the output voltage that presents on the lead-out terminal is near desired magnitude of voltage; Testing circuit, the variation in voltage of the detection terminal that current potential should be stable in order to make output voltage stabilization; And auxiliary circuit, when detecting variation in voltage, accelerate the response speed of error amplifier by testing circuit.
According to this mode, testing circuit and auxiliary circuit only current potential should stable terminal be input terminal or lead-out terminal etc. variation in voltage during accelerate the response speed of error amplifier, can suppress output voltage overshoot or under dash.
Testing circuit comprises the detection container that is arranged between the fixing terminal of terminal that current potential should be stable and current potential, thus current potential should be stable the variation in voltage of terminal the time to monitor that the electric current that flows through transiently in the detection container detects variation in voltage also passable.
When circuit is in steady state (SS) because the voltage at the two ends of detection container be certain, so electric current do not flow through, if but input voltage or output voltage fluctuation, then owing to the potential change of one end, so the transition current that is used to discharge and recharge flows through.Testing circuit can detect variation in voltage by monitoring this transition current.
Auxiliary circuit amplifies the electric current that flows through transiently in the detection container, also can feed back the bias current with the differential amplifier circuit that is provided with in the input stage that increases error amplifier.By increasing bias current, the response speed of error amplifier is accelerated.
Here, the magnification of the electric current of auxiliary circuit needn't be necessarily more than or equal to 1, decides according to the response speed of electric current that flows through in the detection container or required circuit, circuit form that feedback is gone to get final product, and also wishes below 1 sometimes.
Auxiliary circuit amplifies the electric current that flows through transiently in the detection container, and the lead-out terminal that feeds back to the differential amplifier circuit that is provided with in the input stage of error amplifier is also passable.
' lead-out terminal of differential amplifier circuit ' refers to constitute the position that differential right this transistorized load of transistor AND gate connects.The electric current that flows through in one of differential pair of transistors is changed, thus can make differential voltage to the slope of output voltage characteristic, be that differential gain becomes the big response speed of accelerating error amplifier.
Another mode of the present invention also is an adjuster circuit.This adjuster circuit comprises: output transistor is arranged between input terminal and lead-out terminal; Error amplifier, the voltage of the control terminal of adjusting output transistor is so that the output voltage that presents on the lead-out terminal is near desired magnitude of voltage; And the detection feedback condenser, be connected between the bias current sources of the differential amplifier circuit that is provided with in the input stage of current potential should be stable in order to make output voltage stabilization terminal and error amplifier.
In this mode, detect feedback condenser and play above-mentioned testing circuit and auxiliary circuit.That is, if current potential should stable terminal be the variation in voltage of input terminal or lead-out terminal, then flow through electric current in detecting feedback condenser, this electric current feeds back to the output of differential amplifier circuit with an x magnification former state.Its result, the inclined to one side value electric current of differential amplifier circuit increases, and can accelerate the response speed of error amplifier, can suppress output voltage fluctuation, particularly overshoot well.
A mode more of the present invention also is an adjuster circuit.This adjuster circuit comprises: output transistor is arranged between input terminal and lead-out terminal; Error amplifier, the voltage of the control terminal of adjusting output transistor is so that the output voltage that presents on the lead-out terminal is near desired magnitude of voltage; And the detection feedback condenser, be connected between the lead-out terminal of the differential amplifier circuit that is provided with in the input stage of current potential should be stable in order to make output voltage stabilization terminal and error amplifier.
According to this mode, thereby the electric current that flows through in one of differential pair of transistors is changed, can accelerate the response speed of error amplifier by detecting the lead-out terminal that the transition current that flows through in the feedback condenser is connected to differential amplifier circuit.
The combination in any of above structural element, or between method, device, system etc. phase double replacement structural element of the present invention, be effective as mode of the present invention.
Should point out that the combination in any of said structure element or rearrangement etc. are effectively and are contained in present embodiment.
In addition, summary of the invention needn't be described all essential feature, and the present invention also can be the combination certainly of described feature.
Description of drawings
Narrate embodiment with reference to the accompanying drawings, embodiment is an illustration, and non-limiting, wherein, identical parts are given identical label in some accompanying drawings.Wherein:
Fig. 1 is the circuit diagram of structure of the adjuster circuit of expression first embodiment.
Fig. 2 is the figure of time waveform of voltage, the electric current of the adjuster circuit of expression input voltage when sharply rising.
Fig. 3 is the figure of variation of the adjuster circuit of expression first embodiment.
Fig. 4 is the circuit diagram of structure of the adjuster circuit of expression second embodiment.
Fig. 5 is a circuit diagram of representing the differential amplifier circuit that is provided with in the inner structure of error amplifier, the particularly input stage in detail.
Fig. 6 is the figure of variation of the adjuster circuit of expression second embodiment.
Fig. 7 is the figure of variation of the combination of expression testing circuit and auxiliary circuit.
Fig. 8 is the circuit diagram of variation of the differential amplifier circuit of presentation graphs 5.
Fig. 9 is the block scheme of a part of automobile that has loaded the adjuster circuit of first or second embodiment.
Embodiment
Below, narrate the present invention based on preferred implementation.Preferred implementation is illustration the present invention and leave no choice but limit scope of the present invention.All features of Miao Shuing and combination are not essential to the present invention in an embodiment.
(first embodiment)
Fig. 1 represents the structure of the adjuster circuit 100 of first embodiment.In following figure, identical textural element is given identical label, and suitably omits explanation.
The adjuster circuit 100 of present embodiment comprises testing circuit 20, auxiliary circuit 30 except error amplifier 10, output transistor 12, first resistance R 1, second resistance R 2, reference voltage source 14.In addition, adjuster circuit 100 comprises input terminal 102, lead-out terminal 104, and voltage that apply or that present on each terminal is called input voltage vin, output voltage V out.
From the reference voltage V ref of reference voltage source 14 output be input to the counter-rotating input terminal of error amplifier 10-.Output voltage V out by first resistance R 1, second resistance R, 2 resistance cut apart, become R2/ (R1+R2) be fed after doubly the non-counter-rotating input terminal that is input to error amplifier 10+.Error amplifier 10 is regulated the grid voltage Vg of output transistor 12 so that the voltage of counter-rotating, non-counter-rotating input terminal is equal.Its result, the value of output voltage V out and input voltage vin is irrelevant, satisfies Vout=(R1+R2)/R2 * Vref and stablizes.
Be at circuit under the situation of steady state (SS), do not flow through electric current among the first transistor M1, the potential difference (PD) between its drain-source is 0V, and the pressure drop that gain is adjusted on the resistance R 3 also is 0V, so the input voltage vin former state is input to an end of detection container C 1.
If the input voltage vin that applies on the input terminal 102 rises, then the voltage of the hot side of detection container C 1 rises along with input voltage vin.Its result, owing to 1 charging of detection container C, detect electric current I det so flow through transiently, testing circuit 20 can detect the change of input voltage vin.
When the change that detects input voltage vin, the detection electric current I det that flows through in the detection container C 1 supplies with from the first transistor M1.This electric current is amplified and is supplied with as feedback current Ifb the gate terminal of output transistor 12 by transistor seconds M2.Can adjust the ratio that resistance R 3 is regulated feedback current Ifb and detected electric current I det by size ratio and the gain of first, second transistor M1, M2.That is, in order to increase current gain, setting increased in size ratio or increase gain are adjusted resistance R 3 and are got final product.
Below, the action of the adjuster circuit 100 of such formation is described based on Fig. 2.Fig. 2 is the figure of time waveform of voltage, the electric current of the adjuster circuit 100 of expression input voltage vin when sharply rising.
Inhibit feature for the output of understanding adjuster circuit 100 of the present invention better changes at first describes the action under the situation of not using testing circuit 20, auxiliary circuit 30.Grid voltage Vg ' that is shown in dotted line among Fig. 2 and output voltage V out ' expression voltage waveform at this moment.
In moment T0～T1, input voltage vin is got certain value, and circuit is in steady state (SS), and output voltage is adjusted to Vout=(R1+R2)/R2 * Vref.At moment T1, can think the situation that input voltage vin rises sharp.
Owing to have grid capacitance Cg between the gate-source terminal of the output transistor 12 of adjuster circuit 100, institute thinks changes grid voltage Vg ', need discharge and recharge this grid capacitance Cg.Here, the time rate of change of grid voltage Vg ' can be expressed as dVg '/dt=I/Cg with grid capacitance Cg and charging and discharging currents I, and itself and grid capacitance amount are inversely proportional to.Therefore, when the grid capacitance of output transistor 12 was big, the variation of grid voltage Vg ' was slow significantly with respect to the change of input voltage vin or output voltage V out.
With respect to source voltage is that input voltage vin rises sharp, and grid voltage Vg ' can not follow it, becomes big so the gate source voltage across poles of output transistor 12 is temporary transient.Its result, drain voltage is the temporary transient rising of output voltage V out ', and overshoot takes place.
Below, based on making action under the situation of testing circuit 20, auxiliary circuit 30 actions in order to prevent overshoot about the adjuster circuit 100 of embodiments of the present invention with voltage waveform Vg, Vout shown in solid line explanation among Fig. 2.
Circuit is in steady state (SS) in moment T0～T1, rises in moment T1 input voltage vin.When input voltage vin rises, flow through in the detection container C 1 of testing circuit 20 and detect electric current I det.Utilize detection capacity of condenser value C1, detect electric current I det and be provided with Idet C1 * dVin/dt.Therefore, in Fig. 2, detect electric current I det with the input voltage vin time diffusion waveform roughly be directly proportional, only when input voltage vin changes, flow through.
In auxiliary circuit 30, be exaggerated and become feedback current Ifb thereby detect electric current I det.This magnification is adjusted resistance R 3 decisions by first, second transistor M1, M2 and gain as mentioned above.By the gate terminal of the feedback current Ifb inflow output transistor 12 after auxiliary circuit 30 amplifications, by this feedback current Ifb, the charging of the being forced to property of grid capacitance Cg of output transistor 12 ground.This means in the relation of dVg/dt=I/Cg, only increase feedback current Ifb and the time rate of change of grid voltage Vg becomes big, rise quickly than the Vg ' that is shown in broken lines with the grid voltage Vg shown in the solid line among Fig. 2 by charging current I.
Its result, even the gate source voltage across poles of output transistor 12 is also to be adjusted to suitable value under the situation of input voltage vin change at source voltage, the overshoot shown in solid line is suppressed, output voltage V out can stablize.
Like this, in the adjuster circuit 100 of present embodiment, detect the only transitional detection electric current I det that flows through during the input voltage vin change by testing circuit 20, this electric current is amplified the also gate terminal of output transistor 12, can prevent overshoot thereby grid voltage Vg is risen.
In addition, as mentioned above, be directly proportional with the time diffusion of input voltage vin, so only during the timeliness change, flow through owing to detecting electric current I det and feedback current Ifb.Therefore, the adjuster circuit 100 of present embodiment can not increase the current sinking when being in steady state (SS), suppresses the variation in voltage of output voltage V out.
Fig. 3 represents the variation of the adjuster circuit 100 of present embodiment.In this variation, the testing circuit 20 conduct terminals that its current potential should be stable for output voltage V out is stablized directly detect the variation in voltage of output voltage V out.
In this variation, detection container C 2 is connected to lead-out terminal 104, because output voltage V out change detects electric current I det and flows through.
If output current reduces sharp owing to be connected the change of the load circuit on the lead-out terminal 104, then output voltage V out follows in this and begins to rise.Its result flows through in detection container C 2 and detects electric current I det.Detect electric current I det based on the size of the 3rd transistor M3, the 4th transistor M4 than and be exaggerated, amplified current 11 is further amplified by the first transistor M1 and transistor seconds M2, feed back to the gate terminal of output transistor 12 as feedback current Ifb, grid voltage Vg is risen.Its result, voltage decreases between the gate-source of output transistor 12, the output current of output transistor 12 reduces, so can suppress the overshoot of output voltage V out well.
Equally, under the situation that input voltage vin sharply rises, also rise in this variation, so also can suppress to follow the overshoot of the change of input voltage vin by the change that monitors output voltage V out owing to follow in this output voltage V out.
(second embodiment)
In the first embodiment, the gate terminal that feeds back to output transistor 12 of the change by the circuit that will be detected by testing circuit 20 suppresses overshoot.Second embodiment that will illustrate below, by feeding back to the error amplifier 10 that constitutes adjuster circuit 100 by the variation in voltage that testing circuit 20 detects, improve the gain of error amplifier 10 and accelerate response speed, thus only circuit in an interim state during improve the response of adjuster circuit.
Fig. 4 represents the structure of the adjuster circuit 100 of second embodiment.Adjuster circuit 100 comprises error amplifier 10, output transistor 12, reference voltage source 14, first resistance R 1, second resistance R 2, testing circuit 20, auxiliary circuit 40.
Fig. 5 represents the inner structure of error amplifier 10, at length represents the differential amplifier circuit 50 that is provided with in the input stage especially.Differential amplifier circuit 50 comprise by transistor M10, M11 constitute differential to, supply with the constant current source 52 of the bias current of differential amplifier circuit 50, as transistor M13, the M14 of Constant Current Load.
The gate terminal of transistor M10, M11 is corresponding with the counter-rotating of error amplifier 10, non-counter-rotating input terminal respectively, reference voltage V ref is input to the gate terminal of transistor M10, and output voltage is divided into R2/ (R1+R2) by resistance and doubly feeds back the gate terminal that is input to transistor M11.
Because transistor M10～M16 symmetry connects, so with transistor M10, M13, M15 its structure is described at this.
Transistor M13 flows through constant current Ic by constant current source 54 and transistor M12 control, becomes Constant Current Load.Because so the electric current I o sum that flows through among the electric current I x that the constant current Ic that flows through among this transistor M13 flows through for transistor M10 and the transistor M15 is the Io=Ic-Ix establishment.Transistor M12, M14, M16 have same relation, flow through electric current I o ' among the transistor M16.The gate terminal of transistor M15, M16 is connected jointly with the gate terminal of transistor M17, and transistor M17 is supplied with the constant current of regulation by constant current source 58.Transistor M15, M16 work as the amplifier transistor that the output signal of differential amplifier circuit 50 is amplified, and its electric current I o that flows through separately, Io ' export via the output stage 56 of error amplifier 10.The lead-out terminal of output stage 56 is connected to the gate terminal of output transistor 12.
Terminal 150a, 150b shown in Figure 5 is corresponding with the feedback terminal 150 that auxiliary circuit shown in Figure 4 40 connects.That is, from the feedback current Ifb of auxiliary circuit 40 outputs, in the circuit diagram of Fig. 5, feed back to one of them terminal of feedback terminal 150a, 150b among Fig. 4.Below, the action under the situation that feeds back to feedback terminal 150a, 150b respectively is described.
Under the situation that feeds back to feedback terminal 150a, if input voltage vin rises, follow in this, flow through feedback current Ifba transiently.This feedback current Ifba can think the current source that is set up in parallel with constant current source 52 in differential amplifier circuit shown in Figure 5 50, become big transiently so supply with the differential bias current to M10, M11 (tail current) of differential amplifier circuit 50.
The response speed of error amplifier 10 depends on supplies with this differential bias current to M10, M11, this current value is big more then fast more, so, the response speed of error amplifier 10 is accelerated because of feedback current Ifba, as illustrating with solid line among Fig. 2, the grid voltage Vg of output transistor 12 can follow the change of input voltage and rise rapidly, can suppress the overshoot of output voltage V out well.
The following describes the situation that feeds back to feedback terminal 150b.If input voltage rises, then feedback current Ifbb flows with the direction of the feedback terminal 150b of inflow error amplifier 10.
At this moment, the constant current Ic that flows through among the electric current I x that flows through among the electric current I o that flows through among the transistor M15, the transistor M10, feedback current Ifbb, the transistor M13 satisfies the relation of Ic=Ix+Io+Ifbb, and electric current I o is expressed as Io=Ic-Ix-Ifbb.Therefore, if feedback current increases with the direction that flows into error amplifier 10 then electric current I o minimizing.Electric current I o reduce with the counter-rotating input terminal-voltage uprise and electric current I x increases, or non-counter-rotating input terminal+the voltage step-down and electric current I x to increase be of equal value.
Therefore, if input voltage vin rises, it is big that feedback current Ifbb becomes, and the then output of error amplifier 10, is that the grid voltage Vg of output transistor 12 rises.Its result, the drain voltage of output transistor 12 is the direction feedback of output voltage V out to descend of adjuster circuit 100, suppresses overshoot.
To the feedback of the feedback current Ifbb of feedback terminal 150b, from other aspects, constitute differential right transistor M10, the differential gain of M11 by improving, also can accelerate the response speed of error amplifier 10.
On the contrary, if input voltage vin descends, then feedback current Ifbb flows with the direction that flows out from error amplifier 10.Its result, electric current I o increase, and the output of error amplifier 10, are that the grid voltage Vg of output transistor 12 descends, and the drain voltage of output transistor 12 is the direction feedback of output voltage V out to rise of adjuster circuit 100, dashes under suppressing.
As mentioned above,,, directly feed back by 40 pairs of error amplifiers 10 of auxiliary circuit by detect the change of input voltage vin by testing circuit 20 according to present embodiment, but the response speed of acceleration error amplifier 10.Therefore, by suitably select feedback terminal, can distinguish to suppress well with respect to the change of input voltage vin following dash, overshoot.
In addition, because feedback current Ifb is mobile transiently when input voltage vin changes, so during adjuster circuit 100 is in steady state (SS), do not increase the current sinking of circuit.
In addition, in the present embodiment, in Fig. 4, testing circuit 20 is connected to input terminal 102, detects the change of input voltage vin, thereby but testing circuit 20 is connected to the change that lead-out terminal 104 detects output voltage V out also can obtains same effect.
Fig. 6 is the expression modified embodiment of the present embodiment.In this variation, replace the testing circuit 20 of Fig. 4 and auxiliary circuit 40 and be provided with and detect feedback condenser Cfb1～Cfb4, be a routine circuit that suppresses overshoot easily and dash down.These feedback terminal 150a, 150b that detect feedback condenser Cfb1～Cfb4 feedback correspond respectively to feedback terminal 150a, the 150b among Fig. 5.
Detecting feedback condenser Cfb1 is arranged between input terminal 102 and the feedback terminal 150a.If input voltage vin rises, then flow through and be used for detecting the transition current of feedback condenser Cfb1 charging, feedback current Ifb1 flows into error amplifier 10 from feedback terminal 150a.Its result, it is big to constitute the electrorheological that flows through among differential right transistor M10, the M11 of differential amplifier circuit 50 shown in Figure 5, so can improve the response speed of error amplifier 10, can suppress overshoot well.
Detecting feedback condenser Cfb2 is arranged between lead-out terminal 104 and the feedback terminal 150a.If output voltage V out rises, the feedback current Ifb2 that then is used for detecting feedback condenser Cfb2 charging flows into error amplifier 10, by improving the response speed of error amplifier 10, can suppress overshoot well.
Detecting feedback condenser Cfb3 is arranged between input terminal 102 and the feedback terminal 150b.If input voltage vin rises, detect then that transition current flows through among the feedback condenser Cfb1, feedback current Ifb3 flows into error amplifier 10 from feedback terminal 150b.Owing to according to this electric current and the differential gain of error amplifier improves,, can suppress overshoot so the response speed of error amplifier 10 is accelerated.
On the contrary, under the situation that input voltage vin descends, because feedback current Ifb3 reverse direction flow mistake, so to the direction feedback that suppresses to dash down.
Equally, detect feedback condenser Cfb4 by the change that monitors output voltage V out with detect the same effect of feedback condenser Cfb3, can suppress overshoot, Xia Chong.
As mentioned above, detect feedback condenser Cfb1～Cfb4 and have following function simultaneously: the function of the testing circuit of the variation in voltage of the detection terminal that current potential should be stable for output voltage V out is stablized; And, when detecting variation in voltage by testing circuit, the function of the auxiliary circuit of the response speed of quickening error amplifier.Because time diffusion dV/dt and capacitance with voltage provide the current value of feedback with Ifb=Cfb * dV/dt, so pass through suitably to select the capacitance of detection feedback condenser Cfb1～Cfb4, the scalable feedback quantity can suppress output voltage fluctuation well.
Have again, detect feedback condenser Cfb1～Cfb4 and be illustrated in the same circuit diagram, but this not to be defined as simultaneously to use, and independently works because each detects feedback condenser, so it is just passable to be arranged on the position that needs as required.
These embodiments are illustrations, it will be understood by those skilled in the art that the combination of these each textural elements and variety of processes can have various variation, and such variation also belong to scope of the present invention.
In the first embodiment, the testing circuit 20 of the adjuster circuit 100 of Fig. 1 is when input voltage vin changes, detect electric current I det and flow to the ground connection direction, because feedback current Ifb only flows towards the direction of the gate terminal that flows into output transistor 12, so, be effective promptly to the overshoot countermeasure to the direction that grid voltage Vg rises.On the contrary, when input voltage vin or output voltage V out decline, feedback current is also passable from the circuit structure of the gate terminal outflow of output transistor 12.Under the situation that is such circuit structure, the adjuster circuit 100 of Fig. 1 can suppress the following of output voltage V out conversely and dash.
In the first embodiment, adopted MOSFET as output transistor 12, but for also obtaining to prevent the effect of overshoot under the situation of bipolar transistor.That is, under the situation of MOSFET, for its gate capacitance charges is utilized feedback current Ifb, but under the situation of bipolar transistor, collector current is changed, can suppress overshoot by changing base current.
In second embodiment, when detecting the variation in voltage of the terminal that current potential should be stable, accelerate the response speed of error amplifier 10, or offset the feedback of the change of input voltage vin, output voltage V out, also can suitably select the mode of feedback to get final product according to structure, the flow direction of feedback current Ifb, the size of error amplifier 10 by carrying out outside feedback terminal 150a shown in Figure 5, the 150b.
In first or second embodiment, testing circuit 20 and auxiliary circuit 30 or testing circuit 20 and auxiliary circuit 40 also can be structure shown in Figure 7.Fig. 7 is the figure of variation of the combination of expression testing circuit 20 and auxiliary circuit 30.Terminal 106 is connected to the input voltage vin or the output voltage V out of adjuster circuit 100.Resistance R 4 and capacitor C3 series connection are arranged between terminal 106 and ground connection.Even the voltage of terminal 106 rises, but since the voltage Vx of the tie point of resistance R 4 and capacitor C3 rise according to the time constant of CR, so the change of relative terminal 106 and time delay.Because this voltage Vx puts on the gate terminal of transistor M20, so voltage-transition ground becomes big between the gate-source of transistor M20, electric current I fb flows through by transistor M20 conducting.The drain terminal 108 of transistor M20 also can be connected the effect separately that can obtain illustrating in the above-mentioned embodiment with the gate terminal of output transistor 12 or feedback terminal 150a, the 150b of error amplifier 10.
In transistor M20 conduction period, can select to get final product according to the feedback destination of splicing ear 108 or the degree of variation in voltage according to regulating by the time constant of resistance value R4 and capacitance C3 decision.By this circuit, because the electric current when not increasing circuit and be in steady state (SS), so also can suppress current sinking.
Fig. 8 is the circuit diagram of variation of the error amplifier 10 of presentation graphs 5.Below, be the error amplifier 10a of center key diagram 8 with difference with Fig. 5.In the error amplifier 10a of Fig. 8, constant current source 52,54,58 adopts the common P type MOSFET that connects of gate terminal to constitute respectively.The P type MOSFET that constitutes constant current source 52～58 constitutes current mirroring circuit with the transistor M22 that is all P type MOSFET.The constant current source 60 that generates constant current is connected to the drain terminal of transistor M22.In the error amplifier 10a of Fig. 8, the tie point of transistor M22 and constant current source 60 is as feedback terminal 150a.The electric current that flows through among the transistor M22 provides with constant current Ix and feedback current Ifba sum (Ix+Ifba).That is, the variation according to feedback current Ifba changes the electric current that is generated by constant current source 52,54,58.
In the error amplifier 10 of Fig. 5, only the differential right tail current that comprises transistor M10, M11 that is generated by constant current source 52 changes according to feedback current Ifba.On the other hand, in the error amplifier 10a of Fig. 8, except constant current source 52, the constant current that is generated by constant current source 54 and constant current source 58 also increases and decreases according to feedback Ifba.Here, the constant flow regulation Constant Current Load that is generated by constant current source 54 is the biasing of transistor M13, M14, and the amplifier transistor M15 that the output signal of differential amplifier circuit 50 is amplified by the constant flow regulation that constant current source 58 generates, the biasing of M16.Therefore, error amplifier 10a according to Fig. 8, change the bias current of transistor M13, M14 and transistor M15, M16 by increase and decrease, can accelerate the response speed of error amplifier 10, can suppress the change of output voltage V out better according to feedback current Ifba.
With embodiment with and the structural element of variation explanation, not only under situation about adapting to separately, also can suppress overshoot, Xia Chong well by combination arbitrarily.
In embodiment, the transistor that uses is FET, even but the transistor that uses other types such as bipolar transistor also can, their selection decides according to the semiconductor fabrication process of the desired design specification of adjuster circuit, use etc. and gets final product.
In embodiment, the element that constitutes adjuster circuit 100 all can be integrated, also its part can be constituted with discrete parts.Integrated which part decides according to cost and occupied area etc. to get final product.
The adjuster circuit 100 of first, second embodiment for example is loaded on the automobile.Fig. 9 is the block scheme of electric system of automobile 300 that has loaded the adjuster circuit 100 of first or second embodiment.Automobile 300 comprises: battery 310, adjuster circuit 100, Denso equipment 320.Cell voltage Vbat about battery 310 output 12V.Because via relay output, so the change of this cell voltage Vbat timeliness is big.On the other hand, Denso equipment 320 for example is the illuminating LED of automobile audio and auto-navigation system, inner panel etc., is the load that needs the stabilized supply voltage of no timeliness change.Thereby adjuster circuit 100 outputs to Denso equipment 320 with the voltage that cell voltage Vbat is depressurized to regulation.
As mentioned above, follow at high speed with respect to the rapid change of input voltage vin or output voltage V out, the change of output voltage V out can be suppressed little with the adjuster circuit 100 of embodiment explanation.Therefore, the stable purposes of power supply that significantly changes applicable to the voltage that will resemble battery of being loaded on the automobile etc.
In addition, the adjuster circuit 100 that illustrates with embodiment is not limited to vehicle-mounted purposes, thereby can be used for the various purposes with the stabilized input voltage supply load.
With ad hoc fashion the preferred embodiments of the present invention have been described, but such description should be appreciated that under the situation of the spirit and scope that do not break away from claims and can carry out various variations and change just for illustrative purpose.
Claims (14)
1. an adjuster circuit is characterized in that, comprising:
Output transistor is arranged between input terminal and lead-out terminal;
Error amplifier is regulated the voltage of the control terminal of described output transistor, so that the output voltage that presents on the described lead-out terminal is near desired magnitude of voltage;
Testing circuit, the variation in voltage of the detection terminal that current potential should be stable in order to make described output voltage stabilization; And
Auxiliary circuit when detecting variation in voltage by described testing circuit, forcibly makes the change in voltage of the control terminal of described output transistor.
2. adjuster circuit as claimed in claim 1 is characterized in that,
Described testing circuit comprises the detection container that is set between the fixing terminal of terminal that described current potential should be stable and current potential, described current potential should be stable the variation in voltage of terminal the time monitor the electric current that flows through transiently in the described detection container, thereby detect variation in voltage.
3. adjuster circuit as claimed in claim 1 is characterized in that,
Described testing circuit comprises by series connection and is arranged on detection container and the first transistor between the fixing terminal of terminal that described current potential should be stable and current potential,
Described auxiliary circuit comprises described the first transistor and constitutes the transistor seconds of current mirroring circuit, according to the electric current that flows through in the described transistor seconds, the voltage of the control terminal of described output transistor is changed.
4. adjuster circuit as claimed in claim 2 is characterized in that,
Described auxiliary circuit amplifies the electric current that flows through transiently in the described detection container, forcibly makes the voltage rising of this control terminal by the control terminal of the described output transistor of current supply after will amplifying.
5. adjuster circuit as claimed in claim 2 is characterized in that,
Described auxiliary circuit amplifies the electric current that flows through transiently in the described detection container, draws and forcibly make the voltage decline of this control terminal from the control terminal of described output transistor by the electric current after will amplifying.
6. an adjuster circuit is characterized in that, comprising:
Output transistor is arranged between input terminal and lead-out terminal;
Error amplifier is regulated the voltage of the control terminal of described output transistor, so that the output voltage that presents on the described lead-out terminal is near desired magnitude of voltage;
Testing circuit, the variation in voltage of the detection terminal that current potential should be stable in order to make described output voltage stabilization; And
Auxiliary circuit when detecting variation in voltage by described testing circuit, is accelerated the response speed of described error amplifier.
7. adjuster circuit as claimed in claim 6 is characterized in that,
Described testing circuit comprises the detection container that is set between the fixing terminal of terminal that described current potential should be stable and current potential, thus described current potential should be stable the variation in voltage of terminal the time monitor that the electric current that flows through transiently in the described detection container detects variation in voltage.
8. adjuster circuit as claimed in claim 6 is characterized in that,
Described testing circuit comprises by series connection and is arranged on detection container and the first transistor between the fixing terminal of terminal that described current potential should be stable and current potential,
Described auxiliary circuit comprises described the first transistor and constitutes the transistor seconds of current mirroring circuit, according to the electric current that flows through in the described transistor seconds, accelerates the response speed of described error amplifier.
9. adjuster circuit as claimed in claim 7 is characterized in that,
Described auxiliary circuit amplifies the electric current that flows through transiently in the described detection container, feeds back the bias current with the differential amplifier circuit that is provided with in the input stage that increases described error amplifier.
10. adjuster circuit as claimed in claim 9 is characterized in that,
Described auxiliary circuit also amplifies the electric current that flows through transiently in the described detection container, feeds back the bias current with the amplifier transistor that increases the output signal of amplifying described differential amplifier circuit.
11. adjuster circuit as claimed in claim 7 is characterized in that,
Described auxiliary circuit amplifies the electric current that flows through transiently in the described detection container, feeds back to the lead-out terminal of the differential amplifier circuit that is provided with in the input stage of described error amplifier.
12. an adjuster circuit is characterized in that, comprising:
Output transistor is arranged between input terminal and lead-out terminal;
Error amplifier is regulated the voltage of the control terminal of described output transistor, so that the output voltage that presents on the described lead-out terminal is near desired magnitude of voltage; And
Detect feedback condenser, be connected between the bias current sources of the differential amplifier circuit that is provided with in the input stage of current potential should be stable in order to make described output voltage stabilization terminal and described error amplifier.
13. an adjuster circuit is characterized in that, comprising:
Output transistor is arranged between input terminal and lead-out terminal;
Error amplifier is regulated the voltage of the control terminal of described output transistor, so that the output voltage that presents on the described lead-out terminal is near desired magnitude of voltage; And
Detect feedback condenser, be connected between the lead-out terminal of the differential amplifier circuit that is provided with in the input stage of current potential should be stable in order to make described output voltage stabilization terminal and described error amplifier.
14. an automobile is characterized in that, comprising:
Battery; And
The described adjuster circuit of each of claim 1 to 13, the stable and supply load with the voltage of described battery.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004219347 | 2004-07-27 | ||
| JP219347/04 | 2004-07-27 | ||
| JP180476/05 | 2005-06-21 |
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|---|---|
| CN1740937A true CN1740937A (en) | 2006-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510087564 Pending CN1740937A (en) | 2004-07-27 | 2005-07-27 | Regulator circuit capable of detecting variations in voltage |
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| CN102013876A (en) * | 2010-11-25 | 2011-04-13 | 深圳市广迪克科技有限公司 | Combined power control system of radio-frequency power amplifier and method of combined power control system |
| CN102591397A (en) * | 2012-03-06 | 2012-07-18 | 广州金升阳科技有限公司 | A constant current source circuit of negative resistance characteristic |
| CN101231535B (en) * | 2007-01-25 | 2012-10-10 | 美国芯源系统股份有限公司 | Method and apparatus for overshoot and undershoot errors correction in analog low pressure difference linear voltage regulator |
| CN102841624A (en) * | 2011-06-24 | 2012-12-26 | 联咏科技股份有限公司 | Quick reaction current source |
| CN103312276A (en) * | 2013-06-18 | 2013-09-18 | 三维通信股份有限公司 | Power overshoot protection circuit for digital television power amplifier |
| TWI472894B (en) * | 2010-01-13 | 2015-02-11 | Hon Hai Prec Ind Co Ltd | Linearity voltage regulating circuit |
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| CN104714585B (en) * | 2013-12-13 | 2017-07-25 | 精工半导体有限公司 | Voltage-stablizer |
| CN107077159A (en) * | 2014-11-04 | 2017-08-18 | 密克罗奇普技术公司 | Low pressure drop (LDO) adjuster of capacitorless |
| CN107102666A (en) * | 2016-02-22 | 2017-08-29 | 联发科技（新加坡）私人有限公司 | Low pressure difference linear voltage regulator |
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| CN101231535B (en) * | 2007-01-25 | 2012-10-10 | 美国芯源系统股份有限公司 | Method and apparatus for overshoot and undershoot errors correction in analog low pressure difference linear voltage regulator |
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| CN102013876A (en) * | 2010-11-25 | 2011-04-13 | 深圳市广迪克科技有限公司 | Combined power control system of radio-frequency power amplifier and method of combined power control system |
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| CN102841624A (en) * | 2011-06-24 | 2012-12-26 | 联咏科技股份有限公司 | Quick reaction current source |
| CN102841624B (en) * | 2011-06-24 | 2015-09-16 | 联咏科技股份有限公司 | Rapid reaction current source |
| CN102591397A (en) * | 2012-03-06 | 2012-07-18 | 广州金升阳科技有限公司 | A constant current source circuit of negative resistance characteristic |
| CN103312276A (en) * | 2013-06-18 | 2013-09-18 | 三维通信股份有限公司 | Power overshoot protection circuit for digital television power amplifier |
| CN103312276B (en) * | 2013-06-18 | 2016-01-06 | 三维通信股份有限公司 | A kind of power overshoot protective circuit for digital television power amplifier |
| US9323264B2 (en) | 2013-11-05 | 2016-04-26 | Faraday Technology Corp. | Voltage regulator apparatus with sensing modules and related operating method thereof |
| CN104714585B (en) * | 2013-12-13 | 2017-07-25 | 精工半导体有限公司 | Voltage-stablizer |
| CN107077159A (en) * | 2014-11-04 | 2017-08-18 | 密克罗奇普技术公司 | Low pressure drop (LDO) adjuster of capacitorless |
| EP3215904A1 (en) * | 2014-11-04 | 2017-09-13 | Microchip Technology Incorporated | Capacitor-less low drop-out (ldo) regulator |
| US10761552B2 (en) | 2014-11-04 | 2020-09-01 | Microchip Technology Incorporated | Capacitor-less low drop-out (LDO) regulator, integrated circuit, and method |
| EP3215904B1 (en) * | 2014-11-04 | 2022-03-09 | Microchip Technology Incorporated | Capacitor-less low drop-out (ldo) regulator |
| CN107102666A (en) * | 2016-02-22 | 2017-08-29 | 联发科技（新加坡）私人有限公司 | Low pressure difference linear voltage regulator |
| CN108123688A (en) * | 2016-11-28 | 2018-06-05 | 立积电子股份有限公司 | For the promotion circuit of power amplifier |
| CN108123688B (en) * | 2016-11-28 | 2021-06-18 | 立积电子股份有限公司 | Boost circuit for power amplifier |
| CN110058631A (en) * | 2018-01-18 | 2019-07-26 | 恩智浦美国有限公司 | Voltage regulator with feed forward circuit |
| CN110058631B (en) * | 2018-01-18 | 2022-07-29 | 恩智浦美国有限公司 | Voltage regulator with feed forward circuit |
| CN110231846A (en) * | 2019-06-10 | 2019-09-13 | 西安微电子技术研究所 | A kind of power module feedback control circuit difunctional with constant current and constant pressure |
| CN113589017A (en) * | 2021-07-02 | 2021-11-02 | 江苏云意电气股份有限公司 | Dynamic regulation voltage detection circuit |
| CN113589017B (en) * | 2021-07-02 | 2024-01-19 | 江苏云意电气股份有限公司 | Dynamic regulation voltage detection circuit |
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