CN102339082A - Power level control circuit - Google Patents
Power level control circuit Download PDFInfo
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- CN102339082A CN102339082A CN2010102356991A CN201010235699A CN102339082A CN 102339082 A CN102339082 A CN 102339082A CN 2010102356991 A CN2010102356991 A CN 2010102356991A CN 201010235699 A CN201010235699 A CN 201010235699A CN 102339082 A CN102339082 A CN 102339082A
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Abstract
The invention provides a power level control circuit, which comprises a drive circuit, an error amplifying circuit, a current generating circuit and a feedback short circuit checking circuit, wherein the drive circuit receives an error amplifying signal and generates a drive signal according to the error amplifying signal, so as to drive the power level control circuit; the error amplifying circuit receives a feedback voltage, compares the feedback voltage with a reference signal and produces the error amplifying signal according to a comparison result, so as to input the error amplifying signal to the drive circuit; the current generating circuit is coupled with a feedback end and generates a fault detecting current flowing to the feedback end; and when the feedback voltage is smaller than a set feedback short circuit voltage or the fault detecting current is larger than a set feedback short circuit current, the feedback short circuit checking circuit generates a fault signal, so as to input the fault signal to the drive circuit to enable the drive circuit to stop driving the power level control circuit.
Description
Technical field
The present invention relates to a kind of power level control circuit, be meant a kind of power level control circuit especially with back coupling terminal shortcircuit defencive function.
Background technology
Fig. 1 shows the power level control circuit synoptic diagram of prior art, and is as shown in Figure 1, and power level 10 receives input voltage vin by input end, is converted into the output voltage V out (or convert output current into, the apparent load circuit needs voltage stabilizing or current stabilization and decides) of output terminal.Output terminal is electrically connected two resistance in series Z1 and Z2 to earthing potential; Wherein, The across of resistance Z2 is between the back coupling end FB and earth terminal of power level control circuit 20, and its cross-pressure is as error amplifying circuit 22 one input ends of feedback voltage Vfb with power input level control circuit 20.Error amplifying circuit 22 is feedback voltage Vfb and reference signal Vref relatively, and according to comparative result, produces error and amplify signal with input driving circuit 21.Driving circuit 21 amplifies signal according to this error, produces to drive signal, with driving power level 10.
When feedbacking end FB short circuit ground connection, error amplifying circuit 22 will produce abnormal comparative result, make driving circuit 21 produce abnormal driving signal in the circuit, and constantly driving power level 10 boosted output voltages Vout cause danger.For protecting this situation, comparator circuit 23 is set in the circuit in addition, one of its input end receives feedback voltage Vfb; The other end receives feedbacks short circuit setting voltage Vfbs (for example; Can be 0.15V), comparator circuit 23 relatively feedback voltage Vfb with feedback short circuit setting voltage Vfbs, when feedback voltage Vfb when feedbacking short circuit setting voltage Vfbs; Promptly judge to feedback and hold FB to be short-circuited, and send signal to stop driving power level 10.
Yet when the circuit initial start; Because of power level 10 or does not just begin effect as yet, output voltage V out is zero or extremely low, and this moment, the comparative result of comparator circuit 23 was also meaningless; Instead can cause the circuit erroneous judgement, the output that therefore must hide from view comparator circuit 23 at the circuit start initial stage.Generally speaking when the circuit initial start; Power supply starting reset circuit 25 meeting out-put supplies start the replacement signal, and (power ON reset is POR) to driving circuit 21, with the beginning start-up routine; So can utilize this power initiation replacement signal POR; Hide from view signal inv_BL at interval by hiding from view circuit 24 one of generation at interval, with the output of hiding from view comparator circuit 23, shown in gate circuit and door 26 at the circuit start initial stage.
Please with reference to Fig. 2 A, Fig. 2 A marks Fig. 1 circuit in the start-up routine of normal running, the signal waveform of each point.When power initiation replacement signal POR was high levle, circuit got into start-up routine.The desired value of supposing output voltage V out is Vout_set, and its corresponding feedback voltage Vfb position is accurate to be 1.25V, and then reference signal Vref is made as 1.25V, and short circuit setting signal Vfbs then can be set at for example 0.15V.For avoiding causing the circuit erroneous judgement at the circuit start initial stage; Hiding from view at interval circuit 24 produces one according to power initiation replacement signal POR and hides from view signal inv_BL at interval; Hide from view interval time (blanking time) Tbk to postpone one section; Guarantee that in start-up routine gradually in the uphill process, its current potential has been crossed the setting current potential of feedbacking short circuit setting voltage Vfbs to feedback voltage Vfb from earth potential.When hiding from view that at interval signal inv_BL is high levle, the comparative result of comparator circuit 23 could pass through a gate circuit and 26 an arrival driving circuit 21, as correct fault signal FAULT.
Yet; During side circuit is used; Input voltage vin, output voltage V out, and load state maybe be different; The speed that causes feedback voltage Vfb to rise is different, therefore hides from view the setting (that is hiding from view setting of signal inv_BL at interval) of Tbk interval time, must long enough can not judge by accident to guarantee under the input voltage of minimum and maximum load state, still can normally start.Yet shown in Fig. 2 B, if,, possibly feedback the infringement that cause circuit when end FB short-circuit protection mechanism does not start as yet if the end FB situation of short circuit takes place to feedback when maximum input voltage and when non-loaded.In the power level control circuit of prior art, normally start in order to ensure circuit, must hide from view the next temporary transient forbidden energy back coupling of Tbk interval time end FB short-circuit protection mechanism by setting to start, this practice is unsatisfactory.
Because the above; The present invention promptly is directed against the deficiency of prior art; A kind of power level control circuit with back coupling terminal shortcircuit defencive function is proposed; Wherein need not set to start and hide from view Tbk interval time, and can make this power level control circuit when circuit start, just receive the protection of back coupling terminal shortcircuit.
Summary of the invention
One of the object of the invention is to overcome the deficiency and the defective of prior art, proposes a kind of power level control circuit, and compared to prior art, back coupling terminal shortcircuit defencive function of the present invention need not receive the restriction of hiding from view interval time.
For reaching above-mentioned purpose; The invention provides a kind of power level control circuit, this power level drives signal control by one, to convert an input voltage into an output voltage or output current; This power level control circuit comprises: one drive circuit; It receives an error and amplifies signal, and should drive signal according to this error amplification signal generation, to drive this power level; One error amplifying circuit and one is feedback end and is coupled, and receiving a feedback voltage, and with this feedback voltage and a reference signal relatively, produces this error amplification signal according to comparative result, to import this driving circuit; One current generating circuit couples with this back coupling end, and this current generating circuit produces this back coupling end of a detecting fault current direction; And one feedback the test for short-circuit circuit, and in order to check this feedback voltage, when this feedback voltage was feedback the short circuit setting voltage less than one, this back coupling test for short-circuit circuit produced a fault signal to import this driving circuit, makes this driving circuit stop to drive this power level.
In a kind of preferable enforcement kenel; This current generating circuit comprises a current source, holds to produce the back coupling of detecting fault current direction, and one or more diode; Be coupled to a node with current source, this one or more diode makes electric current unlikely by the reverse inflow of this back coupling end.In addition, this current generating circuit should more comprise a voltage clamping circuit, with the voltage of this node of clamp.This voltage clamping circuit for example comprises one of following circuit: diode, MOS transistor, two-carrier transistor, Zener diode or above combination of elements.
In the preferable enforcement kenel of another kind; This current generating circuit comprises an error amplifier and a transistor; This this transistorized controlled end of error amplifier control; This error amplifier is the clamping voltage set of this transistorized electric current outflow end voltage and one relatively, controls this transistor thus and produces this detecting fault electric current.
In the preferable enforcement kenel of another kind, this current generating circuit comprises a transistor, and this transistorized controlled end is controlled by the clamping voltage set and adds this transistorized conducting limit voltage, controls this transistor thus and produces this detecting fault electric current.
In the preferable enforcement kenel of another kind, this back coupling test for short-circuit circuit comprises a comparator circuit, and it is this feedback voltage and this back coupling short circuit setting voltage relatively, and according to comparative result, produces this fault signal.This back coupling test for short-circuit circuit also can be phase inverter, when this feedback voltage is zero or produces this fault signal during near no-voltage.
Implement in the kenel at another; The invention provides a kind of power level control circuit, this power level drives signal control by one, to convert an input voltage into an output voltage or output current; This power level control circuit comprises: one drive circuit; It receives an error and amplifies signal, and should drive signal according to this error amplification signal generation, to drive this power level; One error amplifying circuit and one is feedback end and is coupled, and receiving a feedback voltage, and with this feedback voltage and a reference signal relatively, produces this error amplification signal according to comparative result, to import this driving circuit; One current generating circuit couples with this back coupling end, and this current generating circuit produces this back coupling end of a detecting fault current direction; And one feedback the test for short-circuit circuit; In order to check this detecting fault electric current; When this detecting fault electric current was feedback the short-circuit current setting signal greater than one, this back coupling test for short-circuit circuit produced a fault signal to import this driving circuit, makes this driving circuit stop to drive this power level.
In a kind of preferable enforcement kenel; Above-mentioned power level control circuit should more comprise one and remove dither circuit; Be serially connected with between this back coupling test for short-circuit circuit and the driving circuit; It has one and removes the shake setting-up time, in this time, to get rid of this this driving circuit of fault signal input, to remove the initial stage noise.
In a kind of preferable enforcement kenel, this power level control circuit is integrated into an integrated circuit.
Said power level can be a linear power supply supply circuit (linear regulator) or a suitching type power supply circuit (switching regulator).
Explain in detail through specific embodiment below, when the effect that is easier to understand the object of the invention, technology contents, characteristics and is reached.
Description of drawings
Fig. 1 marks the power level control circuit synoptic diagram of prior art;
Fig. 2 A marks Fig. 1 circuit in the start-up routine of normal running, the signal waveform of each point;
Fig. 2 B marks in the start-up routine of Fig. 1 circuit under output terminal FB short-circuit conditions, the signal waveform of each point;
Fig. 3 marks the first embodiment of the present invention;
Fig. 4 A, 4B mark two embodiment of the back coupling test for short-circuit circuit 33 among the present invention;
Fig. 5 A-5F marks several embodiment of current generating circuit 34;
Fig. 6 marks another embodiment of the present invention;
Fig. 7 marks another embodiment of back coupling test for short-circuit circuit 33;
Fig. 8 A-8D marks other several embodiment of current generating circuit 34;
Fig. 9 marks another embodiment again of the present invention, wherein is provided with the removal dither circuit;
Figure 10 marks an embodiment more of the present invention, wherein also is provided with the removal dither circuit;
Figure 11 A marks the embodiment of the invention in the start-up routine of normal running, the signal waveform of each point;
Figure 11 B marks in the start-up routine of the embodiment of the invention under output terminal FB short-circuit conditions, the signal waveform of each point;
Figure 12 marks the schematic circuit diagram of linear power supply supply circuit;
Figure 13 A and 13B mark the schematic circuit diagram of voltage-dropping type switching power level;
Figure 14 A and 14B mark the schematic circuit diagram of booster type switching power level;
Figure 15 A and 15B mark the schematic circuit diagram of back-pressure type switching power level;
Figure 16 A and 16B mark the schematic circuit diagram of buck-boost type power level;
Figure 17 A and 17B mark the schematic circuit diagram that rises back-pressure type power level.
Symbol description among the figure
10 power levels
20,30 power level control circuits
21 driving circuits
22 error amplifying circuits
23 comparator circuits
24 hide from view circuit at interval
25 power initiation reset circuits
26 gate circuits and door
33 back coupling test for short-circuit circuit
331 comparator circuits
332 phase inverters
333 current comparators
34 current generating circuits
341 current source circuits
342 voltage clamping circuits
343 error amplifiers
35 remove dither circuit
The A node
The D diode
FAULT fault signal
FB feedbacks end
Ifd detecting fault electric current
Electric current is set in Ifds back coupling short circuit
Inv_BL hides from view signal at interval
POR power initiation replacement signal
The Q transistor
The Vin input voltage
The Vout output voltage
The Vfb feedback voltage
Vfbs back coupling short circuit setting voltage
The Vref reference signal
Z1, Z2 resistance
Embodiment
Please refer to Fig. 3, show the first embodiment of the present invention.As shown in the figure, power level control circuit 30 comprises driving circuit 21, error amplifying circuit 22, back coupling test for short-circuit circuit 33, and current generating circuit 34.Wherein, driving circuit 21 receives from the error of error amplifying circuit 22 and amplifies signal, and output drives signal with driving power level 10.In addition, driving circuit 21 also receives fault signal FAULT, to stop driving power level 10 when the circuit abnormality.Error amplifying circuit 22 1 input ends couple with back coupling end FB, and to receive feedback voltage Vfb, another input end receives reference signal Vref; Error amplifying circuit 22 is feedback voltage Vfb and reference signal Vref relatively, and according to comparative result, produces error and amplify signal with input driving circuit 21; Wherein, feedback voltage Vfb takes from the node voltage between resistance Z1 and Z2, and is as shown in the figure; Resistance Z2 one end is coupled to earthing potential; After the other end and resistance Z1 coupled, the other end again of resistance Z1 was coupled to output terminal, that is resistance Z1 and Z2 constitute branch pressure voltage with sampling output voltage V out.Simultaneously; Feedback voltage Vfb also imports back coupling test for short-circuit circuit 33; End FB feedback the situation that whether is short-circuited in order to inspection, when feedbacking end FB the situation that is short-circuited, feedback test for short-circuit circuit 33 just export fault signal FAULT to driving circuit 21 to stop driving power level 10.
Among the present invention, when circuit start, do not set one section and hide from view interval time, but innovation ground adopts diverse mechanism.As shown in the figure, be provided with a current generating circuit 34 in the circuit of the present invention, FB couples with the back coupling end, and provides a detecting fault electric current I fd to flow to back coupling end FB.Detecting fault electric current I fd can be fixed value or change value, and whether its effect is to feedback under the situation of end FB short circuit and short circuit ground connection not, is producing different feedback voltage Vfb or different Ifd current values, holding FB to be short-circuited to distinguish to feedback.The resistance value of in detail, feedbacking between end FB and the earth potential has two kinds of states:
Situation (1) is feedback and can be considered zero resistance between end FB and the earth potential when feedbacking end FB short circuit ground connection.
Situation (2) when feedback end FB not short circuit ground connection and circuit at starting state; When output voltage V out is zero or extremely low; Can be considered resistance Z1 and Z2 and be connected in parallel between back coupling end FB and the earth potential, so the resistance value of feedbacking between end FB and the earth potential is resistance Z1 and Z2 parallel resistor value=Z1 * Z2/ (Z1+Z2).
By on can know that the resistance value of feedbacking between end FB and the earth potential is
Resistance value [situation (1)]＜＜resistance value [situation (2)]
Therefore as if providing a fixing detecting fault electric current I fd to flow to back coupling end FB, then the voltage (that is feedback voltage Vfb) on the back coupling end FB equals
Vfb=Ifb * (feedback and hold the resistance value between FB and the earth potential)
Because of Ifb is a fixed value, so feedback voltage Vfb is equally
Vfb [situation (1)]＜＜Vfb [situation (2)]
In other words, if between situation (1) and situation (2), suitably set a reference voltage, called after back coupling short circuit setting voltage Vfbs makes it have following relation:
Vfb [situation (1)]＜Vfbs＜Vfb [situation (2)]
Whether just can feedback short circuit setting voltage Vfbs with this through feedback voltage Vfb relatively distinguishes and feedbacks end FB and be short-circuited.That is the back coupling test for short-circuit circuit 33 among Fig. 3 can embody with comparator circuit 331 shown in Fig. 4 A, and one input end and back coupling end FB couple, and to receive feedback voltage Vfb, another input end receives back coupling short circuit setting voltage Vfbs.Comparator circuit 331 is feedback voltage Vfb and back coupling short circuit setting voltage Vfbs relatively, and according to comparative result, whether decision produces fault signal FAULT.
Back coupling test for short-circuit circuit 33 has various embodiments, is not limited to the comparator circuit 331 shown in Fig. 4 A.Because of feedback voltage Vfb gap between situation (1) and situation (2) very big; Feedback voltage Vfb equals or near zero potential when situation (1); So shown in Fig. 4 B; Back coupling test for short-circuit circuit 33 also can be phase inverter 332, holds FB (feedback voltage Vfb) just to produce fault signal FAULT constantly for 0V or near no-voltage when feedbacking.
Current generating circuit 34 can have the various practices, and its simplest mode provides a current source, shown in Fig. 5 A.For preventing electric current self-feedback end FB adverse current, should (but non-imperative) one or more diode D be set in the circuit.Fig. 5 A circuit belongs to this case scope certainly, but preferred embodiments should provide a voltage clamping circuit 342 then like Fig. 5 B, with the voltage at nip node A place.Reason please contrast consults Fig. 3; As feedback voltage Vfb during near reference signal; Error amplifying circuit 22 gets into linear adjustment district; This moment, electric current I fb flow through voltage that resistance Z2 produced such as too high, will influence the comparative result of feedback voltage Vfb and reference signal Vref, made error amplifier 22 export incorrect signal.Please return and read Fig. 5 B; The voltage at voltage clamping circuit 342 nip node A places; Suppose its with the voltage clamp at node A place in (clamping voltage Vclmp+0.7V), just can stop to produce detecting fault electric current I fd feedbacking the voltage (feedback voltage Vfb) of end FB when being higher than clamping voltage Vclmp; Avoid influencing the comparison of feedback voltage Vfb and reference signal Vref on the one hand, the aspect can reduce the circuit power consumption in addition.For example, if reference signal Vref is 1.25V, back coupling short circuit setting voltage Vfbs is set at 0.15V, and then clamping voltage Vclmp can be set at any appropriate value between the two, for example 0.3V (certainly, above numerical value is merely for example).
Be the detecting fault electric current I fd of hypothesis administration of fixed value among the above embodiment, but the present invention also can be changed to the detecting fault electric current I fd that changes.As previously mentioned, because of the resistance value of feedbacking between end FB and the earth potential be
Resistance value [situation (1)]＜＜resistance value [situation (2)]
So if a fixing or approaching fixing voltage difference is provided between back coupling end FB and earth potential, then the electric current I fd between back coupling end FB and the earth potential will be following relation:
Ifd [situation (1)]＞＞Ifd [situation (2)]
In other words, if between situation (1) and situation (2), suitably set a reference current value, electric current I fbs is set in called after back coupling short circuit, makes it have following relation:
Ifb [situation (1)]＞Ifbs＞Ifb [situation (2)]
Whether just can feedback short circuit with this through electric current I fb relatively sets electric current I fbs and distinguishes and feedback end FB and be short-circuited; Its circuit can be as shown in Figure 6; Back coupling test for short-circuit circuit 33 wherein can be as shown in Figure 7; Compare detecting fault electric current I fb and feedback short circuit setting electric current I fbs with current comparator 333, and according to comparative result, whether decision produces fault signal FAULT.(certainly, signal Ifb and Ifbs among Fig. 7 are merely signal, and it can be respectively the correlation function value of Ifb and Ifbs and needn't be own or its equal value of Ifb and Ifbs in the side circuit.)
The current generating circuit 34 of collocation Fig. 6 for example can be shown in Fig. 8 A-8D; Key diagram 8A at first; Current generating circuit 34 can comprise the circuit that is made up of error amplifier 343 and transistor Q, the controlled end of error amplifier 343 oxide-semiconductor control transistors Q (golden oxygen half (MOS) transistorized grid or the transistorized base stage of two-carrier).Error amplifier 343 is the electric current outflow end voltage of this transistor Q (N type gold oxygen half (NMOS) transistorized source electrode or the transistorized emitter-base bandgap grading of two-carrier) and clamping voltage Vclmp relatively, thus oxide-semiconductor control transistors Q and produce detecting fault electric current I fd.In the present embodiment, when feedbacking end FB short circuit ground connection (situation (1)), feedback voltage Vfb is zero or near no-voltage, so detecting fault electric current I fd is very big; Feedbacking end FB not during short circuit ground connection; The voltage of error amplifier 343 equates; That is the source electrode of transistor Q (electric current outflow end) voltage equates with clamping voltage Vclmp; Therefore feedback voltage Vfb can be clamped on voltage Vclmp, the current value of the detecting fault electric current I fd of this moment during much smaller than situation (1).Again; Feedback end FB not short circuit ground connection and output voltage V out draw high when making feedback voltage Vfb be higher than voltage Vclmp, because of error amplifier 343 negative input end voltages greater than positive input terminal, so not conducting of transistor Q; Current generating circuit 34 fails naturally; Stop to export detecting fault electric current I fd, avoid influencing the comparison of feedback voltage Vfb and reference signal Vref on the one hand, the aspect can reduce the circuit power consumption in addition.
For avoiding when feedbacking end FB short circuit ground connection; The excessive circuit that causes of detecting fault electric current I fd damages; Current-limiting circuit can be set separately, and the size that is connected (for example be connected in transistor Q above or below) or design transistor Q with the current generating circuit of Fig. 8 A is to limit its maximum current flow.
Fig. 8 B shows another embodiment of current generating circuit 34, and current generating circuit 34 comprises transistor Q in the present embodiment, and its grid is controlled by voltage Vclmp+VTH, and wherein VTH is the conducting limit voltage of transistor Q.When feedbacking end FB short circuit ground connection (situation (1)), feedback voltage Vfb is zero or near no-voltage, the grid source electrode of transistor Q and grid leak pole tension difference are all very big, so detecting fault electric current I fd is very big; Feedbacking end FB not during short circuit ground connection, and the gate-source voltage difference of transistor Q is VTH, thus can be with source electrode (electric current outflow end) voltage clamp of transistor Q in voltage Vclmp, the current value of detecting fault electric current I fd at this moment during much smaller than situation (1).In addition, feedback end FB not short circuit ground connection and output voltage V out draw high when making feedback voltage Vfb be higher than voltage Vclmp, not conducting of transistor Q, current generating circuit 34 fails naturally, stops to export detecting fault electric current I fd.
With Fig. 8 A similarly; For avoiding when feedbacking end FB short circuit ground connection; The excessive circuit that causes of detecting fault electric current I fd damages; Current-limiting circuit can be set separately, and the size that is connected (for example be connected on transistor Q above or below) or design transistor Q with the current generating circuit of Fig. 8 A is to limit its maximum current flow.
Transistor Q among Fig. 8 A-8B is not limited to golden oxygen half (MOS) transistor and can changes and be the two-carrier transistor, and shown in Fig. 8 C-8D, its circuit function is similar with Fig. 8 A-8B, detailed description in addition.
What need explanation is; Though produce the detecting fault electric current I fd of change among Fig. 8 A-8D; But feedbacking end FB short circuit ground connection or not during short circuit ground connection; Its feedback voltage Vfb is also different, the back coupling test for short-circuit circuit 33 of the circuit framework of Fig. 3 and Fig. 4 A-4B so the current generating circuit 34 of Fig. 8 A-8D also can be arranged in pairs or groups, and be not limited to the arrange in pairs or groups circuit framework of Fig. 6 and the back coupling test for short-circuit circuit 33 of Fig. 7.
See also Fig. 9-10; Two other embodiment that shows integrated circuit of the present invention; As shown in the figure, feedback test for short-circuit circuit 33 can for but be not limited to comparator circuit 331 or current comparator 333 (also can be the phase inverter 332 of Fig. 4 B among Fig. 9), still comprise the mechanism of noise filtering among this external Fig. 9-10 embodiment; The signal that back coupling test for short-circuit circuit 33 produces is through removing dither circuit (Noise Debounce Circuit) 35; It has one and removes the shake setting-up time, with the noise among the signal FAULT that in this time, fixes a breakdown, makes the driving circuit 21 can be because of the noise misoperation.(what need explanation is; It is different that the effect of removing dither circuit 35 and prior art are hidden from view interval circuit 24; Hiding from view at interval, circuit 24 is to hide from view fault signal FAULT when not putting in place as yet at circuit starting stage, feedback voltage Vfb; It is applicable to the circuit start initial stage, and needs to set long blanking time; Whether removing 35 of dither circuits is the jittering noise among the constant filter faults signal FAULT, irrelevant the unloading phase of being in circuit, and the removal of setting shake time hiding from view interval time when far being shorter than circuit start.)
Circuit of the present invention is in the start-up routine of normal running, and the signal waveform of each point is please with reference to Figure 11 A.Contrast for convenient illustrations and with prior art; The desired value of still supposing output voltage V out is Vout_set; Its corresponding feedback voltage Vfb position is accurate to be 1.25V; That is reference signal Vref is made as 1.25V, and feedbacks test for short-circuit circuit 33 if use the comparers 331 of Fig. 4 A, and then short circuit setting signal Vfbs is set at for example 0.15V.Certainly, above numerical value can adapt to the different application occasion and change.As shown in the figure; In start-up routine; Be that output voltage V out rises in the process of output voltage setting value Vout_set by 0, the effect of failover detecting current Ifd, feedback voltage Vfb is locked in minimum voltage Vclmp; Rise up to output voltage V out, make corresponding feedback voltage Vfb surpass minimum voltage Vclmp.Because of feedback voltage Vfb greater than short circuit setting signal Vfbs, so can not produce the fault signal FAULT of high levle, that is,, can't cause fault signal FAULT misoperation even at the start-up routine initial stage according to the present invention, also just need not set and not hide from view interval time.
On the other hand, Figure 11 B marks the each point signal waveform of feedbacking when holding FB to be short-circuited situation.When back coupling end FB is short-circuited to earthing potential; Its voltage maintains earthing potential 0V; Because feedback voltage Vfb can not be lower than and feedbacks short circuit setting voltage Vfbs during normal the startup,, also can judge at once and feedback end FB the situation that is short-circuited even therefore at the start-up routine initial stage; And need not hide from view interval time like one section of the said delay of prior art, increase the risk that causes circuit to damage.As being provided with the removal dither circuit 35 shown in Fig. 9-10 in the circuit; The removal shake time T db that will have one section extremely short then as shown in the figure; To eliminate the initial stage noise; This removes shake time T db and far is shorter than of the prior art hiding from view interval time, therefore can judge more fast and feedback end FB the situation that whether is short-circuited.
Among above-mentioned each embodiment, power level control circuit 30 can but be not limited to be integrated into an integrated circuit.
In the foregoing description, feedback short circuit setting voltage Vfbs less than minimum voltage Vclmp, and minimum voltage Vclmp is less than reference signal Vref.This is normal the setting, but also visual actual demand changes, and for example feedbacks short circuit setting voltage Vfbs can equal minimum voltage Vclmp.
In the foregoing description, power level 10 can be the linear power supply supply circuit, also can be the switching power supply circuit.For example, the linear power supply supply circuit that power level 10 for example can be shown in figure 12; Also can be and rise back-pressure (Inverter-Boost) switched power supply or the like shown in buck (Buck-Boost) switched power supply, Figure 17 A and the 17B shown in back-pressure type (Inverter) switched power supply, Figure 16 A and the 16B shown in booster type (Boost) switched power supply, Figure 15 A and the 15B shown in the voltage-dropping type shown in Figure 13 A and the 13B (Buck) switched power supply, Figure 14 A and the 14B.
Below to preferred embodiment the present invention being described, is the above, be merely to make those skilled in the art be easy to understand content of the present invention, and be not to be used for limiting interest field of the present invention.Under same spirit of the present invention, those skilled in the art can think and various equivalence changes.For example, direct-connected two circuit of icon or interelement among the embodiment, can plant does not influence other circuit or the element of major function; And for example, the input end sign of error amplifying circuit or comparator circuit can be exchanged, and nmos pass transistor can change the PMOS transistor, only needs in circuit, to do corresponding modification; Resistance Z1 and Z2 can change and be the element of other tool resistance value or circuit; Or the like.Therefore, all various equivalences change, and all should be included within the scope of the present invention.
Claims (15)
1. power level control circuit, this power level drives signal control by one,, it is characterized in that this power level control circuit comprises to convert an input voltage into an output voltage or output current:
One drive circuit, it receives an error and amplifies signal, and should drive signal according to this error amplification signal generation, to drive this power level;
One error amplifying circuit and one is feedback end and is coupled, and receiving a feedback voltage, and with this feedback voltage and a reference signal relatively, produces this error amplification signal according to comparative result, to import this driving circuit;
One current generating circuit couples with this back coupling end, and this current generating circuit produces this back coupling end of a detecting fault current direction; And
One back coupling test for short-circuit circuit, in order to check this feedback voltage, when this feedback voltage was feedback the short circuit setting voltage less than one, this back coupling test for short-circuit circuit produced a fault signal to import this driving circuit, makes this driving circuit stop to drive this power level.
2. power level control circuit as claimed in claim 1, wherein, this current generating circuit comprises a current source, produces this back coupling end of this detecting fault current direction.
3. power level control circuit as claimed in claim 2, wherein, this current generating circuit also comprises one or more diode, is coupled to a node with this current source, and this one or more diode makes electric current unlikely by the reverse inflow of this back coupling end.
4. power level control circuit as claimed in claim 3, wherein, this current generating circuit also comprises a voltage clamping circuit, with the voltage of this node of clamp.
5. power level control circuit as claimed in claim 4, wherein, this voltage clamping circuit comprises one of following circuit: diode, MOS transistor, two-carrier transistor, Zener diode or above combination of elements.
6. power level control circuit as claimed in claim 1; Wherein, This current generating circuit comprises an error amplifier and a transistor; This error amplifier control this transistorized controlled end, this error amplifier be the clamping voltage of this transistorized electric current outflow end voltage and a setting relatively, controls this transistor thus and produces this detecting fault electric current.
7. power level control circuit as claimed in claim 1; Wherein, This current generating circuit comprises a transistor, and this transistorized controlled end is controlled by the clamping voltage set and adds this transistorized conducting limit voltage, controls this transistor thus and produces this detecting fault electric current.
8. power level control circuit as claimed in claim 1, wherein, this back coupling test for short-circuit circuit comprises a comparator circuit, and it is this feedback voltage and this back coupling short circuit setting voltage relatively, and according to comparative result, produces this fault signal.
9. power level control circuit as claimed in claim 1, wherein, this back coupling test for short-circuit circuit comprises a phase inverter, when this feedback voltage is zero or produces this fault signal during near no-voltage.
10. power level control circuit, this power level drives signal control by one,, it is characterized in that this power level control circuit comprises to convert an input voltage into an output voltage or output current:
One drive circuit, it receives an error and amplifies signal, and should drive signal according to this error amplification signal generation, to drive this power level;
One error amplifying circuit and one is feedback end and is coupled, and receiving a feedback voltage, and with this feedback voltage and a reference signal relatively, produces this error amplification signal according to comparative result, to import this driving circuit;
One current generating circuit couples with this back coupling end, and this current generating circuit produces this back coupling end of a detecting fault current direction; And
One back coupling test for short-circuit circuit; In order to check this detecting fault electric current; When this detecting fault electric current was feedback short circuit setting electric current greater than one, this back coupling test for short-circuit circuit produced a fault signal to import this driving circuit, makes this driving circuit stop to drive this power level.
11. power level control circuit like claim 10; Wherein, This current generating circuit comprises an error amplifier and a transistor; This error amplifier control this transistorized controlled end, this error amplifier be the clamping voltage of this transistorized electric current outflow end voltage and a setting relatively, controls this transistor thus and produces this detecting fault electric current.
12. power level control circuit like claim 10; Wherein, This current generating circuit comprises a transistor, and this this transistorized controlled end is controlled by the clamping voltage set and adds this transistorized conducting limit voltage, controls this transistor thus and produces this detecting fault electric current.
13. like the power level control circuit of claim 10, wherein, this back coupling test for short-circuit circuit comprises a comparator circuit, it is this detecting fault electric current and this back coupling short circuit setting electric current relatively, and according to comparative result, produces this fault signal.
14. power level control circuit like claim 1 or 10; Also comprise one and remove dither circuit, be serially connected with between this back coupling test for short-circuit circuit and the driving circuit, it has one and removes the shake setting-up time; In this time, to get rid of this this driving circuit of fault signal input, to remove the initial stage noise.
15. like the power level control circuit of claim 1 or 10, wherein, this power level is a linear power supply supply circuit or a suitching type power supply circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010235699.1A CN102339082B (en) | 2010-07-22 | 2010-07-22 | Power level control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010235699.1A CN102339082B (en) | 2010-07-22 | 2010-07-22 | Power level control circuit |
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| CN102339082A true CN102339082A (en) | 2012-02-01 |
| CN102339082B CN102339082B (en) | 2015-03-11 |
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| CN105094194A (en) * | 2014-05-13 | 2015-11-25 | 万国半导体(开曼)股份有限公司 | Voltage control method |
| CN105514944A (en) * | 2016-01-28 | 2016-04-20 | 杰华特微电子（张家港）有限公司 | Power protection circuit and method |
| WO2018188175A1 (en) * | 2017-04-11 | 2018-10-18 | 惠科股份有限公司 | Overcurrent protection circuit, display panel, and display apparatus |
| CN109075735A (en) * | 2016-03-04 | 2018-12-21 | 日本电产株式会社 | Power inverter, motor drive unit and electric power steering apparatus |
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| Publication number | Publication date |
|---|---|
| CN102339082B (en) | 2015-03-11 |
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Effective date of registration: 20200420 Address after: Taiwan County, Hsinchu city China Chupei Patentee after: RICHTEK TECHNOLOGY Corp. Address before: 300 March Plaza, 430 Sai Wan Road, Grand Cayman, British West Indies Patentee before: Richpower Microelectrics Corp. |
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