CN109358295A - A kind of power failure indicating circuit applied to DC-DC - Google Patents
A kind of power failure indicating circuit applied to DC-DC Download PDFInfo
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- CN109358295A CN109358295A CN201811102946.3A CN201811102946A CN109358295A CN 109358295 A CN109358295 A CN 109358295A CN 201811102946 A CN201811102946 A CN 201811102946A CN 109358295 A CN109358295 A CN 109358295A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of power failure indicating circuits applied to DC-DC, including reference circuit, DC-DC feedback network, failure comparator circuit, wherein: DC-DC feedback network, receive the output voltage of DC-DC, and sensing voltage Vsense is obtained by electric resistance partial pressure, feedback voltage V sense is sent to failure comparison voltage；Reference circuit generates reference voltage, and divides the reference voltage to obtain four comparison voltage signals and be sent to failure comparison circuit；Failure comparison circuit, feedback voltage V sense value is compared with the first comparison voltage signal, the second comparison voltage signal, third comparison voltage signal, the 4th comparison voltage signal respectively, feedback voltage V sense lower than the second comparison voltage or is higher than the 4th comparison voltage in uphill process, either " effective " Reflector signal is exported lower than the first comparison voltage or higher than third comparison voltage during decline.The present invention can effectively monitor the output voltage variation of DC-DC pressure-drop type Switching Power Supply.
Description
Technical field
The present invention relates to a kind of power failure indicating circuits of DC-DC dc-dc converter, are especially applied to Switching Power Supply
In and operating temperature range wider environment higher to output voltage required precision.
Background technique
The stability of the power supply that the output of DC-DC dc-dc converter is powered frequently as whole system, DC-DC output voltage is straight
The working condition for influencing whole system is connect, so needing to design power-fail circuit, real-time monitoring is carried out to output voltage failure.
System application in, for can real-time detecting system power supply the case where, Power Supply Monitoring core need to be added in system building
Piece not only increases overall power, and increase area for total system, do not meet integrated circuit miniaturization and
The growth requirement of low-power consumption.Some does not contain failure indicating circuit to existing DC-DC converter circuit, is applying in this way
Once output VOUT is unstable in journey or the case where power down occurs, and system can not be distinguished or be handled in time.Secondly, being integrated in DC-
The comparison voltage precision of the failure indicating circuit of DC is low, and hysteresis value is realized by internal comparator, thus brings hysteresis
Value varies with temperature larger problem, and in DC-DC course of normal operation due to caused by the frequently switching on of internal power pipe
Noise will lead to the poor anti jamming capability of comparison voltage.
Summary of the invention
Technology of the invention solves the problems, such as: having overcome the deficiencies of the prior art and provide a kind of power supply applied to DC-DC
Failure indicating circuit effectively monitors the output voltage variation of DC-DC pressure-drop type Switching Power Supply.
The technical solution of the invention is as follows: a kind of power failure indicating circuit applied to DC-DC, which includes base
Quasi- circuit, DC-DC feedback network, failure comparator circuit, in which:
DC-DC feedback network receives the output voltage of DC-DC, and obtains feedback voltage V sense by electric resistance partial pressure, will
Feedback voltage V sense is sent to failure comparison voltage；
Reference circuit generates reference voltage, and reference voltage is passed through resistance under the action of the supply voltage of DC-DC
Partial pressure obtains four comparison voltage signals and is sent to failure comparison circuit, and four comparison voltage signals are according to from small to large
Sequence is successively denoted as the first comparison voltage signal, the second comparison voltage signal, third comparison voltage signal, the 4th comparison voltage letter
Number；
Failure comparison circuit believes feedback voltage V sense value with the first comparison voltage signal, the second comparison voltage respectively
Number, third comparison voltage signal, the 4th comparison voltage signal be compared, feedback voltage V sense voltage in uphill process is low
In the second comparison voltage or it is higher than the 4th comparison voltage, exports " effective " Reflector signal, showing power supply, there are failures, no
Then, engineering noise Reflector signal is exported, showing power supply, there is no failures；Feedback voltage V sense voltage during decline is low
In the first comparison voltage or it is higher than third comparison voltage, exports " effective " Reflector signal, shows that DC-DC power source has event
Barrier；Otherwise, engineering noise Reflector signal is exported, showing DC-DC power source, there is no failures.
The reference circuit includes PMOS tube MP1, operational amplifier OPA, NPN triode Q1 and Q2, resistance R11, R12,
R13 and R14, divider resistance string, the source electrode of PMOS tube MP1 meet power vd D, and grid meets bias voltage Vbias, and drain electrode connects partial pressure electricity
Resistance string, the drain voltage of PMOS tube MP1 is as reference power supply VBG, electricity group R11 and R12 be commonly connected to reference power supply VBG, another
End connects the end in the same direction of operational amplifier OPA respectively and backward end, the emitter of triode Q1 and Q2 are separately connected the end in the same direction of OPA
And backward end, base stage connect divider resistance string, and the collector of Q2 connects resistance R13, and the one of the collector of R13 connection Q1 and R14
End, the other end of R14 is connected to the ground, the first comparison voltage, the second comparison voltage, third comparison voltage, the 4th comparison voltage by
VREFVoltage is by divider resistance string partial pressure gained.
The divider resistance string is the resistance being serially connected.
Between the first comparison voltage signal, the second comparison voltage signal and third comparison voltage signal, the 4th compare
There is fixed pressure difference between voltage signal, which is known as hysteresis voltage, and the hysteresis voltage value is feedback voltage
The 3%~5% of Vsense.
The second comparison voltage value are as follows:
The third comparison voltage value are as follows:
The failure comparison circuit include switch S1, S2, S3, S4, comparator COMP1, COMP2, buffer BUFF1,
BUFF2, phase inverter INV1, INV2, INV3, INV4, INV5, XOR gate NOR1；
Feedback voltage V sense connects the anode of comparator COMP1 and COMP2, the first comparison voltage signal, second simultaneously
Comparison voltage signal passes through the negative terminal that switch S1 and S2 are connected to comparator COMP1 respectively, and the connection of comparator COMP1 output end is slow
Device BUFF1 is rushed, the output end of buffer BUFF1 connects phase inverter INV1；The output end signal and phase inverter of buffer BUFF1
The output signal of INV1 is respectively used to feedback control switch S1 and S2；
Third comparison voltage signal, the 4th comparison voltage signal pass through switch S3 and S4 respectively and are connected to comparator COMP2
Negative terminal, comparator COMP2 output end connects buffer BUFF2, and the output end of buffer BUFF2 is sequentially connected phase inverter INV2
With phase inverter INV3；The output end signal of buffer BUFF2 and the output signal of phase inverter INV2 are respectively used to feedback control and open
Close S3 and S4；
The output end of phase inverter INV1 and phase inverter INV3 connect the input terminal of XOR gate NOR1, the output of XOR gate simultaneously
End is sequentially connected phase inverter INV4 and phase inverter INV5, and the output of phase inverter INV5 is Reflector signal.
The failure comparison circuit further includes resistance R1, R2, R3, R4, R5, capacitor C1, C2, C3, C4 and C5,
Resistance R1 is connected between feedback voltage V sense and comparator COMP1 anode, and C1 is being connected to comparator COMP1 just
Between end and ground, resistance R1 and capacitor C1 constitute RC filter circuit, for filtering out the interference on feedback voltage V sense；
Between resistance R2 connection the first comparison voltage signal and switch S1, C2 connection the first comparison voltage signal and switch S1
Shared end to ground, resistance R2 and capacitor C2 constitute RC filter circuit, for filtering out the interference on the first comparison voltage signal；
Between resistance R3 connection the first comparison voltage signal and switch S2, C2 connection the first comparison voltage signal and switch S2
Shared end to ground, resistance R3 and capacitor C2 constitute RC filter circuit, for filtering out the interference on the second comparison voltage signal；
Between resistance R4 connection the first comparison voltage signal and switch S3, C3 connection the first comparison voltage signal and switch S3
Shared end to ground, resistance R4 and capacitor C3 constitute RC filter circuit, for filtering out the interference on third comparison voltage signal；
Between resistance R5 connection the first comparison voltage signal and switch S4, C4 connection the first comparison voltage signal and switch S4
Shared end to ground, resistance R5 and capacitor C4 constitute RC filter circuit, for filtering out the interference on the 4th comparison voltage signal.
The DC-DC feedback network includes inductance L2, resistance R21 and R22, and the one end inductance L2 connects the output electricity of DC-DC
Signal is pressed, the other end connection resistance R21, resistance R21 and resistance R22 connect ground connection, the partial pressure between resistance R21 and resistance R22
Point feeds back to failure comparison circuit, as feedback voltage V sense.
The DC-DC is step-up switching power supply, adjusting and voltage-reduction switch power supply or buck-boost switching power.
The advantages of the present invention over the prior art are that:
(1), the present invention includes the voltage comparator with hysteresis, and comparison voltage is by band-gap reference circuit by divider resistance
The 4 comparison voltage signals unrelated with temperature and supply voltage formed, hysteresis voltage are 2 fixed comparison voltage signals
Difference, for 3% feedback voltage, for the comparator compared to traditional inside hysteresis, hysteresis value is influenced by temperature, technique
It is smaller and simple in realization.
(2), reference voltage of the present invention is unrelated with supply voltage and temperature by the case where supply voltage acts on, obtaining one
Reference voltage, and four benchmark comparison voltages are exported after electric resistance partial pressure, when variation of ambient temperature is larger, and it is defeated to DC-DC
It is defeated in order to DC-DC in the failure indicating circuit of DC-DC circuit interior design out under the higher application environment of required precision
When abnormal conditions occurs in the power supply of voltage out, i.e. system, it can be differentiated in time；
(3), the core electricity on the basis of PSRR accessory power supply VBG of good performance is used in reference voltage circuit of the present invention
Road power supply structure, fault-signal caused by preventing reference voltage from disturbing accidentally are overturn；
(3), since the switching tube inside DC-DC circuit is constantly in switch state at work, the noise of ground terminal compared with
Greatly, the present invention input terminal be added antinoise design with prevent fault-signal because input signal interference and accidentally turning over for generating
Turn；
(4), the enable signal that Reflector signal of the present invention can be used as next stage DC-DC circuit carries out multiple chips successively
The cascade configuration of more circuit electric sequences is completed in the sequence powered on.
Detailed description of the invention
Fig. 1 is the power failure indicating circuit the general frame that the present invention is applied to DC-DC；
Fig. 2 is reference circuit of embodiment of the present invention schematic diagram；
Fig. 3 is divider resistance of embodiment of the present invention string schematic diagram；
Fig. 4 is failure indicating circuit of embodiment of the present invention schematic diagram；
Fig. 5 is DC-DC of embodiment of the present invention feedback network figure；
Fig. 6 is cascade configuration schematic diagram of the embodiment of the present invention in system application.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Fig. 1 is the power failure indicating circuit that the present invention is applied to DC-DC, which includes including reference circuit, DC-DC
Feedback network, failure comparator circuit, in which:
DC-DC feedback network receives the output voltage of DC-DC, and obtains feedback voltage V sense by electric resistance partial pressure, will
Feedback voltage V sense is sent to failure comparison voltage；
Reference circuit generates reference voltage, and reference voltage is passed through resistance under the action of the supply voltage of DC-DC
Partial pressure obtains four comparison voltage signals and is sent to failure comparison circuit, and four comparison voltage signals are according to from small to large
Sequence is successively denoted as the first comparison voltage signal, the second comparison voltage signal, third comparison voltage signal, the 4th comparison voltage letter
Number；
Failure comparison circuit believes feedback voltage V sense value with the first comparison voltage signal, the second comparison voltage respectively
Number, third comparison voltage signal, the 4th comparison voltage signal be compared, feedback voltage V sense voltage in uphill process is low
In the second comparison voltage or it is higher than the 4th comparison voltage, exports " effective " Reflector signal, showing power supply, there are failures, no
Then, engineering noise Reflector signal is exported, showing power supply, there is no failures；Feedback voltage V sense voltage during decline is low
In the first comparison voltage or it is higher than third comparison voltage, exports " effective " Reflector signal, shows that DC-DC power source has event
Barrier；Otherwise, engineering noise Reflector signal is exported, shows DC-DC power source there is no failure, Reflector signal is exported to next
Grade circuit.
Between the first comparison voltage signal, the second comparison voltage signal and third comparison voltage signal, the 4th compare
There is fixed pressure difference between voltage signal, which is known as hysteresis voltage, and the hysteresis voltage value is feedback voltage
The 3%~5% of Vsense.
The second comparison voltage value are as follows:
The third comparison voltage value are as follows:
Such as first comparison voltage signal be 91% feedback voltage V sense, the second comparison voltage signal is 94% feedback
Voltage Vsense, third comparison voltage signal are 106% feedback voltage V sense, the 4th comparison voltage signal is 109% feedback
Voltage Vsense.When being lower than feedback voltage V sense, there are 3% hysteresis voltages during raising and lowering.It is feeding back
In voltage Vsense uphill process, when being higher than the second comparison voltage and being lower than four comparison voltages, power supply is normal condition, is not sent out
Raw failure；During feedback voltage V sense decline, when being higher than the first comparison voltage and being lower than third comparison voltage, power supply is
Normal condition does not break down.Other situations are power failure.
As shown in Fig. 2, the reference circuit includes PMOS tube MP1, operational amplifier OPA, NPN triode Q1 and Q2, electricity
R11, R12, R13 and R14, divider resistance string are hindered, the source electrode of PMOS tube MP1 meets power vd D, and grid meets bias voltage Vbias, makes
The PMOS tube MP1 work is obtained in saturation region, drain electrode connects divider resistance string, and the drain voltage of PMOS tube MP1 is as reference power supply
VRG, electricity group R11 and R12 be commonly connected to reference power supply VBG, the other end connects the end in the same direction of operational amplifier OPA and reversed respectively
End, the emitter of triode Q1 and Q2 are separately connected the end in the same direction of OPA and backward end, base stage connect divider resistance string, the collection of Q2
Electrode connects resistance R13, and the collector of R13 connection Q1 and one end of R14, the other end of R14 are connected to the ground, and the first comparison is electric
Pressure, the second comparison voltage, third comparison voltage, the 4th comparison voltage are by VREFVoltage is by divider resistance string partial pressure gained.
As shown in figure 3, the divider resistance string is the resistance being serially connected.
Since reference circuit is that the preferential of entire chip powers on module, power supply arises directly from port input voltage VDD,
And VDD will generate biggish noise in DC-DC work, therefore in framework selection, use PSRR auxiliary of good performance
Power supply VBGOn the basis of core circuit power supply structure, prevent reference voltage disturb caused by fault-signal accidentally overturn.
For reference circuit under supply voltage effect, the present invention obtains a reference voltage unrelated with supply voltage and temperature
VREF, and 4 comparison voltages are generated by electric resistance partial pressure, to failure indicating circuit, the supply voltage is the work of DC-DC for output
Make voltage.
The reference voltage principle formula unrelated with temperature and supply voltage is as follows, wherein VREFAre as follows:
I×R13=VBE1-VBE2=VT*lnn
Wherein VRE1And VRE2For the base-collector voltage of corresponding triode, VT=kT/q, k are Boltzmann constant, q
For electron charge, n is the emitter area ratio of Q2 and Q1.By the above expression formula it is found that the resistance value of adjustment resistance R13 and R14 are supported
The V for the triode voltage with negative temperature characteristic and the positive temperature characterisitic of disappearingTVoltage, available VREFVoltage is and supply voltage
VDD and the unrelated voltage of temperature.The V of the designBGVoltage is 1.8V, VREFValue is 1.2V.And point by having low-temperature coefficient
0.72V, 0.75V needed for piezoresistance string obtains the design.0.85V and 0.88V voltage.
The failure comparison circuit include switch S1, S2, S3, S4, comparator COMP1, COMP2, buffer BUFF1,
BUFF2, phase inverter INV1, INV2, INV3, INV4, INV5, XOR gate NOR1；
Feedback voltage V sense connects the anode of comparator COMP1 and COMP2, the first comparison voltage signal, second simultaneously
Comparison voltage signal passes through the negative terminal that switch S1 and S2 are connected to comparator COMP1 respectively, and the connection of comparator COMP1 output end is slow
Device BUFF1 is rushed, the output end of buffer BUFF1 connects phase inverter INV1；The output end signal and phase inverter of buffer BUFF1
The output signal of INV1 is respectively used to feedback control switch S1 and S2；
Third comparison voltage signal, the 4th comparison voltage signal pass through switch S3 and S4 respectively and are connected to comparator COMP2
Negative terminal, comparator COMP2 output end connects buffer BUFF2, and the output end of buffer BUFF2 is sequentially connected phase inverter INV2
With phase inverter INV3；The output end signal of buffer BUFF2 and the output signal of phase inverter INV2 are respectively used to feedback control and open
Close S3 and S4；
The output end of phase inverter INV1 and phase inverter INV3 connect the input terminal of XOR gate NOR1, the output of XOR gate simultaneously
End is sequentially connected phase inverter INV4 and phase inverter INV5, and the output of phase inverter INV5 is Reflector signal.
Preferably, as shown in figure 4, the failure comparison circuit further includes resistance R1, R2, R3, R4, R5, capacitor
C1, C2, C3, C4 and C5,
Resistance R1 is connected between feedback voltage V sense and comparator COMP1 anode, and C1 is being connected to comparator COMP1 just
Between end and ground, resistance R1 and capacitor C1 constitute RC filter circuit, for filtering out the interference on feedback voltage V sense；
Between resistance R2 connection the first comparison voltage signal and switch S1, C2 connection the first comparison voltage signal and switch S1
Shared end to ground, resistance R2 and capacitor C2 constitute RC filter circuit, for filtering out the interference on the first comparison voltage signal；
Between resistance R3 connection the first comparison voltage signal and switch S2, C2 connection the first comparison voltage signal and switch S2
Shared end to ground, resistance R3 and capacitor C2 constitute RC filter circuit, for filtering out the interference on the second comparison voltage signal；
Between resistance R4 connection the first comparison voltage signal and switch S3, C3 connection the first comparison voltage signal and switch S3
Shared end to ground, resistance R4 and capacitor C3 constitute RC filter circuit, for filtering out the interference on third comparison voltage signal；
Between resistance R5 connection the first comparison voltage signal and switch S4, C4 connection the first comparison voltage signal and switch S4
Shared end to ground, resistance R5 and capacitor C4 constitute RC filter circuit, for filtering out the interference on the 4th comparison voltage signal.
As shown in figure 5, the DC-DC feedback network includes inductance L2, resistance R21 and R22, the one end inductance L2 connects DC-
The output voltage signal of DC, the other end connection resistance R21, resistance R21 and resistance R22 connect ground connection, resistance R21 and resistance R22
Between dividing point feed back to failure comparison circuit, as feedback voltage V sense signal.
Feedback voltage V sense have passed through filter network R1 and C1, and the forward end as COMP1 and COMP2.It is feeding back
Voltage Vsense uphill process, initial S1 are low level, and S2 is high level, switch S2 closure, feedback voltage V sense and benchmark
The V0P75 of circuit is compared, and when feedback voltage V sense is more than V0P75 and not up to V0P88, output signal S2 is become by height
It is low, and since feedback voltage V sense is lower than V0P88, the output signal S5 of COMP2 comparator be it is low, at this point, Power Good
Output is height, i.e. power supply fault-free.When feedback voltage V sense continues to rise, after more than V0P88, signal S5 is become from low
Height, Power Good output become low from height, i.e. power failure.Decline process in feedback voltage V sense, so that Power
The feedback voltage V sense threshold value of Good overturning in feedback voltage V sense uphill process there are the hysteresis of 30mV, initial S3 and
S5 is high level, and S2 is low level, Power Good output be it is low, as feedback voltage V sense continues to decline, be lower than V0P85
Afterwards, S5 level is lower by height, and Power Good output at this time is height, i.e. power supply fault-free, under feedback voltage V sense continues
When being brought down below V0P72, S2 is got higher by low, and Power Good output becomes low from height, i.e. power failure.That is feedback voltage
Power failure point of the Vsense in uphill process is lower than 0.75V or to be higher than 0.88V, and feedback voltage V sense is in decline process
Middle there are the hysteresis voltages of 30mV, and power failure point is lower than 0.72V or higher than 0.85V.
It is dry in full warm area, full power supply voltage range and external noise due to the power supply module that DC-DC is whole system
It disturbs in larger situation, stable power failure can still be kept to indicate to carry out data processing so as to subsequent conditioning circuit.Institute of the present invention
Comparison voltage is the unrelated with temperature, supply voltage of reference circuit output, and the voltage letter all by RC filtering processing
Number.
Fig. 6 is cascade configuration of the circuit of the present invention in system application, by the port Power Good of first circuit
(PWRGD) it is connected to the enabled port EN of next stage circuit, after first circuit stability exports, exports high Power Good letter
Number, next stage circuit just cancels enabled state at this time, completes the setting of electric sequence.
The present invention, which is not described in detail, partly belongs to common sense well known to those skilled in the art.
Claims (10)
1. a kind of power failure indicating circuit applied to DC-DC, it is characterised in that: including reference circuit, DC-DC feedback net
Network, failure comparator circuit, in which:
DC-DC feedback network receives the output voltage of DC-DC, and obtains feedback voltage V sense by electric resistance partial pressure, will feed back
Voltage Vsense is sent to failure comparison voltage；
Reference circuit generates reference voltage, and reference voltage is passed through electric resistance partial pressure under the action of the supply voltage of DC-DC
It obtains four comparison voltage signals and is sent to failure comparison circuit, four comparison voltage signals are according to sequence from small to large
Successively it is denoted as the first comparison voltage signal, the second comparison voltage signal, third comparison voltage signal, the 4th comparison voltage signal；
Failure comparison circuit, by feedback voltage V sense value respectively with the first comparison voltage signal, the second comparison voltage signal,
Three comparison voltage signals, the 4th comparison voltage signal are compared, feedback voltage V sense in uphill process voltage lower than the
Two comparison voltages are higher than the 4th comparison voltage, export " effective " Reflector signal, showing power supply, there are failures, otherwise, defeated
Engineering noise Reflector signal out, showing power supply, there is no failures；Feedback voltage V sense during decline voltage lower than the
One comparison voltage is higher than third comparison voltage, exports " effective " Reflector signal, showing DC-DC power source, there are failures；It is no
Then, engineering noise Reflector signal is exported, showing DC-DC power source, there is no failures.
2. the power failure indicating circuit according to claim 1 applied to DC-DC, it is characterised in that: the benchmark electricity
Road includes PMOS tube MP1, operational amplifier OPA, NPN triode Q1 and Q2, resistance R11, R12, R13 and R14, divider resistance
String, the source electrode of PMOS tube MP1 meet power vd D, and grid meets bias voltage Vbias, and drain electrode connects divider resistance string, PMOS tube MP1's
Drain voltage is as reference power supply VBG, electricity group R11 and R12 be commonly connected to reference power supply VBG, the other end connects operation amplifier respectively
The end in the same direction of device OPA and backward end, the emitter of triode Q1 and Q2 are separately connected the end in the same direction of OPA and backward end, base stage connect
Divider resistance string is connect, the collector of Q2 connects resistance R13, the collector of R13 connection Q1 and one end of R14, and the other end of R14 connects
It is connected to ground, the first comparison voltage, the second comparison voltage, third comparison voltage, the 4th comparison voltage are by VREFVoltage is by partial pressure electricity
Resistance string partial pressure gained.
3. the power failure indicating circuit according to claim 1 applied to DC-DC, it is characterised in that: the partial pressure electricity
Resistance string is the resistance being serially connected.
4. the power failure indicating circuit according to claim 1 applied to DC-DC, it is characterised in that: first ratio
It is solid compared with existing between third comparison voltage signal, the 4th comparison voltage signal between voltage signal, the second comparison voltage signal
Level pressure is poor, which is known as hysteresis voltage, and the hysteresis voltage value is the 3%~5% of feedback voltage V sense.
5. the power failure indicating circuit according to claim 1 applied to DC-DC, it is characterised in that: second ratio
It is compared with voltage value.
6. the power failure indicating circuit according to claim 1 applied to DC-DC, it is characterised in that: the third ratio
It is compared with voltage value.
7. the power failure indicating circuit according to claim 1 applied to DC-DC, it is characterised in that: the failure ratio
Compared with circuit include switch S1, S2, S3, S4, comparator COMP1, COMP2, buffer BUFF1, BUFF2, phase inverter INV1,
INV2, INV3, INV4, INV5, XOR gate NOR1；
Feedback voltage V sense connects the anode of comparator COMP1 and COMP2 simultaneously, and the first comparison voltage signal, second are compared
Voltage signal passes through the negative terminal that switch S1 and S2 are connected to comparator COMP1 respectively, and comparator COMP1 output end connects buffer
The output end of BUFF1, buffer BUFF1 connect phase inverter INV1；The output end signal of buffer BUFF1 and phase inverter INV1's
Output signal is respectively used to feedback control switch S1 and S2；
Third comparison voltage signal, the 4th comparison voltage signal pass through switch S3 and S4 respectively and are connected to the negative of comparator COMP2
End, comparator COMP2 output end connect buffer BUFF2, and the output end of buffer BUFF2 is sequentially connected phase inverter INV2 and anti-
Phase device INV3；The output end signal of buffer BUFF2 and the output signal of phase inverter INV2 are respectively used to feedback control switch S3
And S4；
The output end of phase inverter INV1 and phase inverter INV3 connect the input terminal of XOR gate NOR1 simultaneously, the output end of XOR gate according to
Secondary connection phase inverter INV4 and phase inverter INV5, the output of phase inverter INV5 are Reflector signal.
8. the power failure indicating circuit according to claim 1 applied to DC-DC, it is characterised in that: the failure ratio
It further include resistance R1, R2, R3, R4, R5, capacitor C1, C2, C3, C4 and C5 compared with circuit,
Resistance R1 is connected between feedback voltage V sense and comparator COMP1 anode, C1 be connected to comparator COMP1 anode with
Between ground, resistance R1 and capacitor C1 constitute RC filter circuit, for filtering out the interference on feedback voltage V sense；
Between resistance R2 connection the first comparison voltage signal and switch S1, C2 connection the first comparison voltage signal is total to switch S1's
With end to ground, resistance R2 and capacitor C2 constitute RC filter circuit, for filtering out the interference on the first comparison voltage signal；
Between resistance R3 connection the first comparison voltage signal and switch S2, C2 connection the first comparison voltage signal is total to switch S2's
With end to ground, resistance R3 and capacitor C2 constitute RC filter circuit, for filtering out the interference on the second comparison voltage signal；
Between resistance R4 connection the first comparison voltage signal and switch S3, C3 connection the first comparison voltage signal is total to switch S3's
With end to ground, resistance R4 and capacitor C3 constitute RC filter circuit, for filtering out the interference on third comparison voltage signal；
Between resistance R5 connection the first comparison voltage signal and switch S4, C4 connection the first comparison voltage signal is total to switch S4's
With end to ground, resistance R5 and capacitor C4 constitute RC filter circuit, for filtering out the interference on the 4th comparison voltage signal.
9. the power failure indicating circuit according to claim 1 applied to DC-DC, it is characterised in that: the DC-DC is anti-
Feedback network includes inductance L2, resistance R21 and R22, and the one end inductance L2 connects the output voltage signal of DC-DC, other end connection electricity
Resistance R21, resistance R21 and resistance R22 connect ground connection, and resistance R21 is electric compared with the dividing point between resistance R22 feeds back to failure
Road, as feedback voltage V sense.
10. the power failure indicating circuit according to claim 1 applied to DC-DC, it is characterised in that: the DC-DC
For step-up switching power supply, adjusting and voltage-reduction switch power supply or buck-boost switching power.
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| CN201811102946.3A CN109358295B (en) | 2018-09-20 | 2018-09-20 | Power failure indicating circuit applied to DC-DC |
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