CN108988624A - A kind of asynchronous start circuit - Google Patents
A kind of asynchronous start circuit Download PDFInfo
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- CN108988624A CN108988624A CN201810863493.XA CN201810863493A CN108988624A CN 108988624 A CN108988624 A CN 108988624A CN 201810863493 A CN201810863493 A CN 201810863493A CN 108988624 A CN108988624 A CN 108988624A
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- start circuit
- asynchronous start
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of asynchronous start circuit belongs to electronic circuit technology field.Including operational amplifier, diode, first capacitor, the second capacitor, 3rd resistor, the 4th resistance and the 5th resistance, first input end of the positive input of operational amplifier as asynchronous start circuit, negative input connect one end of the 5th resistance as the control terminal of asynchronous start circuit and pass through the output end of connection operational amplifier after first capacitor；The anode of diode passes through the output end of connection operational amplifier after the 4th resistance, output end of the cathode as asynchronous start circuit；Second input terminal of the one end of 3rd resistor as asynchronous start circuit, the other end connect the other end of the 5th resistance and by being grounded after the second capacitor.The present invention can be applied to for stablizing the starting timing for accurately controlling each circuit in array in the array of DC-DC or AC-DC circuit composition, applied widely, stability is high and can be compatible with soft start.
Description
Technical field
The invention belongs to electronic circuit technology fields, and in particular to a kind of asynchronous start circuit can be used in controlling DC-DC
Or the boot sequence of AC-DC chip array.
Background technique
In electric power management circuit, start-up circuit is a kind of important circuit, for being made of numerous power management chips
Chip array, can the starting timing that reasonably control each chip in chip array mean in array startup stage, defeated
Whether power out can satisfy the requirement of load.If be not controlled to the starting timing of chip each in chip array,
The power of chip array output can be unstable, to influence whether to load or generate overshoot current, this is in high-power applications
It is extremely serious.Therefore, the circuit for designing a kind of control chip array starting timing has great importance.
Summary of the invention
For the starting sequence problem of said chip array, the present invention proposes a kind of asynchronous start circuit, can be accurately steady
The starting timing of fixed control chip array.
The technical solution of the present invention is as follows:
A kind of asynchronous start circuit, including operational amplifier ASY, diode D1, first capacitor C1, the second capacitor CA, third
Resistance R3, the 4th resistance R4With the 5th resistance R5,
First input end of the positive input of operational amplifier ASY as the asynchronous start circuit, negative sense input
The control terminal as the asynchronous start circuit is held to connect the 5th resistance R5One end and pass through first capacitor C1Connection operation afterwards is put
The output end of big device ASY；
Diode D1Anode pass through the 4th resistance R4Afterwards connect operational amplifier ASY output end, cathode be used as described in
The output end of asynchronous start circuit；
3rd resistor R3Second input terminal of the one end as the asynchronous start circuit, the other end connects the 5th resistance R5
The other end and pass through the second capacitor CAAfter be grounded.
Specifically, the asynchronous start circuit further includes compensating electric capacity CCWith compensation resistance RC,
Compensating electric capacity CCOne end ground connection, the other end connect the asynchronous start circuit first input end and compensation resistance
RCOne end；Compensate resistance RCThe other end connection voltage value be less than the asynchronous start circuit the second input terminal voltage value
Voltage signal.
Specifically, the asynchronous start circuit is applied in BUCK converter, the first input of the asynchronous start circuit
End passes through compensation resistance RCThe output voltage of the BUCK converter is connected afterwards, and the second input terminal connects the BUCK converter
Input voltage, output end connects the feedback voltage of the BUCK converter.
Specifically, the BUCK converter includes error amplifier, the negative input connection of error amplifier is described anti-
Feedthrough voltage, the first positive input connect reference voltage Vref, and the second positive input connects soft start voltage, and error is put
Big device selects the lower signal access of voltage value in the first positive input and the signal of the second positive input connection.
The invention has the benefit that a kind of asynchronous start circuit proposed by the present invention, which can be stablized, accurately controls chip
The starting timing of array, it is applied widely, stability is high and can be compatible with soft start.
Detailed description of the invention
Fig. 1 is that a kind of asynchronous start circuit proposed by the present invention applies the structural schematic diagram in BUCK circuit.
Fig. 2 is a kind of timing diagram of asynchronous start circuit proposed by the present invention.
Fig. 3 is small-signal model figure when a kind of asynchronous start circuit proposed by the present invention is applied in BUCK circuit.
Fig. 4 is that a kind of asynchronous start circuit proposed by the present invention applies the structural schematic diagram in BOOST circuit.
Specific embodiment
The invention will be further elaborated in the following with reference to the drawings and specific embodiments.
A kind of asynchronous start circuit proposed by the present invention, including operational amplifier ASY, diode D1, first capacitor C1,
Two capacitor CA, 3rd resistor R3, the 4th resistance R4With the 5th resistance R5, the positive input ASYINP conduct of operational amplifier ASY
The first input end of asynchronous start circuit, control terminal connection fiveth electricity of the negative input ASYIN as asynchronous start circuit
Hinder R5One end and pass through first capacitor C1The output end of operational amplifier ASY is connected afterwards；Diode D1Anode by the 4th electricity
Hinder R4The output end of operational amplifier ASY, output end of the cathode as asynchronous start circuit are connected afterwards；3rd resistor R3One
The second input terminal as asynchronous start circuit is held, the other end connects the 5th resistance R5The other end and pass through the second capacitor CAAfterwards
Ground connection.
The control terminal of asynchronous start circuit connects externally input control signal, 3rd resistor R3For current-limiting resistance, second
Capacitor CAFor the external bulky capacitor of the control terminal of asynchronous start circuit, first capacitor C1With the 5th resistance R5It is put for stablizing operation
The output voltage V of big device ASYASYOUT, the 4th resistance R4By the output voltage V of operational amplifier ASYASYOUTIt is converted into electric current.
It, can be by introducing compensating electric capacity C if loop is unstable in some embodimentsCWith compensation resistance RCTo introduce pole
Point compensates loop, compensating electric capacity CCOne end ground connection, the other end connect asynchronous start circuit first input end and benefit
Repay resistance RCOne end；Compensate resistance RCThe other end connection voltage value be less than asynchronous start circuit the second input terminal voltage
The voltage signal of value.
Asynchronous start circuit proposed by the present invention can be applied to all DC- that duty ratio is controlled using error amplifier
DC or AC-DC circuit, the present invention will be described in detail for applying asynchronous start circuit of the invention with BUCK converter below
The course of work.
It is structural schematic diagram when applying the present invention to BUCK converter as shown in Figure 1, the first of asynchronous start circuit
Input terminal passes through compensation resistance RCThe output voltage of BUCK converter is connected afterwards, and the second input terminal connects the defeated of BUCK converter
Enter voltage, output end connects the feedback signal FB of BUCK converter, and feedback signal FB is by the first resistor in BUCK converter
R1With second resistance R2It is obtained after the output voltage of BUCK converter is divided, IR1、IR2And IR4Respectively flow through first resistor R1、
Second resistance R2With the 4th resistance R4Electric current.
Asynchronous starting method proposed by the present invention can also be compatible with soft start, as shown in Figure 1, by asynchronous starting of the invention
When circuit is applied to BUCK converter, the negative input of the error amplifier EA of BUCK converter connects feedback signal FB,
First positive input connects reference voltage Vref, and the second positive input connects the soft-start signal of soft starting circuit output
EA_SS.In soft starting circuit, VDDFor soft start bias voltage, ISSFor soft start charging current, SS is soft start input pin,
CSSFor the external bulky capacitor of soft start input pin SS, VOS_SSFor soft start offset voltage, the soft-start signal EA_SS of generation
It is the signal of soft start input pin SS by soft start offset voltage VOS_SSBe output to error amplifier EA afterwards second is positive
The signal of input terminal.Error amplifier EA has the function of automatically selecting lower voltage signal for two positive input,
The higher signal of voltage will be shielded in two positive inputs.
It is a kind of timing diagram of asynchronous start circuit proposed by the present invention shown in Fig. 2, wherein offset indicates operation amplifier
The offset voltage of device ASY is small letter when a kind of asynchronous start circuit proposed by the present invention is applied in BUCK circuit shown in Fig. 3
Number illustraton of model is applied in BUCK converter below with reference to Fig. 2 and Fig. 3 the present invention is described in detail and the work of compatible soft start is former
Reason and the course of work.
When compatible asynchronous starting simultaneously in BUCK converter and soft start two ways, by controlling asynchronous start circuit
The level of control terminal choose whether enabled asynchronous start circuit, when the control termination BUCK converter of asynchronous start circuit
Input voltage VINWhen will shield asynchronous start circuit, at this time soft start work normally, principle are as follows: when the control of asynchronous start circuit
Terminate the input voltage V of BUCK converterINWhen, because of the input voltage V of BUCK converterINPerseverance is greater than its output voltage VOUT,
So in asynchronous start circuit operational amplifier ASY output voltage VASYOUTFor low level, diode D1Cut-off, is opened asynchronous
Dynamic circuit is isolated with main control loop (i.e. BUCK converter), then asynchronous start circuit does not interfere with the feedback of BUCK converter
The voltage value V of signal FBFB, therefore asynchronous start circuit is shielded at this time, soft start will work normally.Integral core piece powers on and partially
After the completion of setting module foundation, reference voltage V is generatedrefWith soft start charging current ISS, capacitor C in soft starting circuitSSStart
It charges, the voltage V at soft start input pin SSSSLess than soft start offset voltage VOS_SSWhen, soft the opening of soft starting circuit output
Dynamic voltage VEA_SSRemain 0, therefore reference voltage VrefIt is shielded, the information of voltage of soft-start signal EA_SS is entered error and puts
Big device EA, then the output voltage V of error amplifierEA_OUTRemain the output voltage V of 0, BUCK converterOUTIt is locked in 0；When
Voltage V at soft start input pin SSSSGreater than soft start offset voltage VOS_SSWhen, the soft start electricity of soft starting circuit output
Press VEA_SSStart with the voltage V at soft start input pin SSSSRise, and VEA_SS=VSS–VOS_SS, then error amplifier
Output voltage VEA_OUTIt begins to ramp up, the clamping action of error amplifier EA makes VFB=VEA_SS, and the output of BUCK converter
Voltage VOUTIt begins to ramp up.As the soft start voltage V of soft starting circuit outputEA_SSGreater than reference voltage VrefAfterwards, soft start voltage
VEA_SSIt is shielded, the reference voltage V of the first positive input of Select Error amplifierrefPut-into error amplifier EA, soft start are complete
At soft starting circuit exits loop.Voltage V at soft start input pin SS laterSSIt will be due to CSSCharging rise to always
Close to soft start bias voltage VDD, make soft start voltage VEA_SSPerseverance is greater than reference voltage Vref, so that soft starting circuit be kept to move back
Loop out.
When using asynchronous starting mode, entire start-up course is divided into three sections, as shown in Fig. 2, first segment is loop-locking
Time adds a control signal within the loop-locking time outside the control terminal of asynchronous start circuit, for asynchronous starting is electric
The voltage V of the control terminal on roadASYINIt is pulled to ground level GND, then whole chip starts power up, after the completion of biasing module is established,
The operational amplifier ASY of asynchronous start circuit starts to work, the BUCK's that the positive input of operational amplifier ASY connects at this time
Output voltage VOUT=0, the voltage V of negative inputASYIN=0, since there are offset voltages for the input terminal of operational amplifier ASY
Offset will make the output voltage V of operational amplifier ASYASYOUTFor high level, in the 4th resistance R4One pressure drop of upper generation,
Enable the 4th resistance R4Meet
It then can guarantee the voltage value V in initial stage feedback signalFBGreater than reference voltage Vref, so that BUCK is converted
The output voltage V of error amplifier in deviceEA_OUT=0, then the output voltage V of BUCK converterOUTIt is locked in 0, i.e., in loop
In locking time, the control end signal of asynchronous start circuit is pulled to ground level GND, BUCK transformation by externally input control signal
The output voltage V of deviceOUTIt is locked as 0.
Second segment is Loop Latencies, in the initial time of Loop Latencies, the i.e. last moment of loop-locking time,
The control terminal of asynchronous start circuit is released no longer input control signal, so that the control terminal voltage V of asynchronous start circuitASYINWith
The second capacitor CAIt charges and increases, as the control terminal voltage V of asynchronous start circuitASYINRise above operational amplifier ASY
Offset voltage offset after, operational amplifier ASY starts clamper, while the electric current of operational amplifier ASY output is still gradually
Reduce, when output electric current is reduced to so that VFB=VrefWhen, the error amplifier EA in BUCK converter starts clamper, master control ring
Road is started to work, the output voltage V of BUCK converterOUTIt begins to ramp up, Loop Latencies terminate.
Third section is the loop work time, due to the clamping action of operational amplifier ASY, the output voltage of BUCK converter
VOUTIt will be with the control terminal voltage V of asynchronous start circuitASYINRise together, simultaneously as the voltage value V of feedback signalFBQuilt
Error amplifier EA clamper is in reference voltage Vref, therefore flow through second resistance R2Electric current IR2It is constant, and IR2=IR1+IR4, stream
Cross first resistor R1Electric current IR1With the output voltage V of BUCK converterOUTRaising and increase, therefore flow through the 4th resistance
R4Electric current IR4With the output voltage V of BUCK converterOUTRaising and reduce, as the output voltage V of BUCK converterOUTIt rises
Height is to so that IR1=IR2When, operational amplifier ASY is no longer to second resistance R2Electric current is exported, operational amplifier ASY will move out master
Control loop.Due to the second capacitor CAIt charges always, finally by the control terminal voltage V of asynchronous start circuitASYINIt will become close to BUCK
The input voltage V of parallel operationIN, because of the input voltage V of BUCK converterINGreater than its output voltage VOUT, therefore operational amplifier
The output voltage V of ASYASYOUTIt will keep low level, diode D1Cut-off, asynchronous start circuit is isolated with master control loop, asynchronous
Start-up course terminates.
As shown in Figure 2, it can be adjusted by being applied to the control signal of asynchronous start circuit control terminal in chip array
Each chip setting loop-locking time length, so that when some chip efficiently controlled in chip array starts, from
And achieve the purpose that control chip array starting timing.
As the above analysis, from the output voltage V of BUCK converterOUTIt begins to ramp up and flows through the 4th resistance R4Electricity
Flow IR4In=0 this period, master control loop will be added in asynchronous start circuit, and asynchronous start circuit will affect master control in the period
Loop guarantees the stability of master control loop, and asynchronous start circuit can exit master control loop after asynchronous starting is completed.Fig. 3
For the small-signal model when master control loop is added in asynchronous start circuit, wherein T1For from the voltage V of feedback signalFBBecome to BUCK
The output voltage V of parallel operationOUTOpen-loop gain, HCLOSED1For from VFBTo VOUTClosed loop gain, T2For asynchronous start circuit is added
Loop gain afterwards, enables T2Gain bandwidth product GBW be much smaller than HCLOSED1Gain bandwidth product GBW, then for T2, HCLOSED1Place
In profound and negative feedbck state, and have
Wherein β is from VOUTFeed back VFBFeedback factor.T can then be obtained2Expression formula be
Wherein s indicates the noise frequency of asynchronous start circuit, it is seen that T2There are two pole and a zero point, one of poles
Point is located at origin, can be by will be by compensation resistance RCWith compensating electric capacity CCThe compensation pole of composition is placed on by the 5th resistance R5
With first capacitor C1The later guarantee T of the pole of composition2Stability.
It is the structural schematic diagram applied asynchronous start circuit proposed by the present invention with BOOST converter as shown in Figure 4, by
In compensation resistance RCThe other end connection voltage value be less than asynchronous start circuit the second input terminal voltage value voltage letter
Number, when the second input terminal of asynchronous start circuit connects the input voltage of BOOST converter, due to the output electricity of BOOST converter
Pressure value is greater than its input voltage value, so can be less than at this time by what the output voltage of BOOST variator generated after partial pressure
The voltage signal of its input voltage value passes through compensation resistance RCConnect the first input end of asynchronous start circuit.
In conclusion a kind of asynchronous start circuit proposed by the present invention can be applied to DC-DC or AC-DC translation circuit group
At chip array in stablize and accurately control the starting timing of each chip, have the characteristics that stability is high, and can be compatible with
Soft starting mode, flexibility are high.
Those skilled in the art disclosed the technical disclosures can make various do not depart from originally according to the present invention
Various other specific variations and combinations of essence are invented, these variations and combinations are still within the scope of the present invention.
Claims (4)
1. a kind of asynchronous start circuit, which is characterized in that including operational amplifier (ASY), diode (D1), first capacitor (C1)、
Second capacitor (CA), 3rd resistor (R3), the 4th resistance (R4) and the 5th resistance (R5),
First input end of the positive input of operational amplifier (ASY) as the asynchronous start circuit, negative input
Control terminal as the asynchronous start circuit connects the 5th resistance (R5) one end and pass through first capacitor (C1) operation is connected afterwards
The output end of amplifier (ASY)；
Diode (D1) anode pass through the 4th resistance (R4) afterwards connect operational amplifier (ASY) output end, cathode is as institute
State the output end of asynchronous start circuit；
3rd resistor (R3) second input terminal of the one end as the asynchronous start circuit, the other end connects the 5th resistance (R5)
The other end and pass through the second capacitor (CA) be grounded afterwards.
2. asynchronous start circuit according to claim 1, which is characterized in that the asynchronous start circuit further includes compensation electricity
Hold (CC) and compensation resistance (RC),
Compensating electric capacity (CC) one end ground connection, the other end connect the asynchronous start circuit first input end and compensation resistance
(RC) one end；Compensate resistance (RC) the other end connection voltage value be less than the asynchronous start circuit the second input terminal electricity
The voltage signal of pressure value.
3. asynchronous start circuit according to claim 2, which is characterized in that the asynchronous start circuit becomes applied to BUCK
In parallel operation, the first input end of the asynchronous start circuit passes through compensation resistance (RC) output of the BUCK converter is connected afterwards
Voltage, the second input terminal connect the input voltage of the BUCK converter, and output end connects the anti-of the BUCK converter
Feedthrough voltage.
4. asynchronous start circuit according to claim 3, which is characterized in that the BUCK converter includes error amplification
Device, the negative input of error amplifier connect the feedback voltage, and the first positive input connects reference voltage (Vref),
Its second positive input connects soft start voltage, and error amplifier selects the first positive input and the second positive input to connect
The lower signal access of voltage value in the signal connect.
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| CN201810863493.XA CN108988624B (en) | 2018-08-01 | 2018-08-01 | Asynchronous starting circuit |
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|---|---|---|---|
| CN201810863493.XA CN108988624B (en) | 2018-08-01 | 2018-08-01 | Asynchronous starting circuit |
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| CN108988624B CN108988624B (en) | 2020-02-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742937A (en) * | 2019-01-23 | 2019-05-10 | 电子科技大学 | A kind of soft starting circuit with Digital Logic multiplexing control |
| CN110350774A (en) * | 2019-07-03 | 2019-10-18 | 南京理工大学 | A kind of soft starting circuit and method |
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| CN107911022A (en) * | 2017-11-08 | 2018-04-13 | 中国电子科技集团公司第五十五研究所 | A kind of control system of peak current mode cuk switch converters |
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| US6025824A (en) * | 1996-12-17 | 2000-02-15 | Rohm Co., Ltd. | Piezoelectric transformer driving circuit and cold cathode tube illuminating device using the same |
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|---|---|
| CN108988624B (en) | 2020-02-04 |
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