CN2774005Y - Flexible starter - Google Patents
Flexible starter Download PDFInfo
- Publication number
- CN2774005Y CN2774005Y CNU2005200030751U CN200520003075U CN2774005Y CN 2774005 Y CN2774005 Y CN 2774005Y CN U2005200030751 U CNU2005200030751 U CN U2005200030751U CN 200520003075 U CN200520003075 U CN 200520003075U CN 2774005 Y CN2774005 Y CN 2774005Y
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- output
- electric capacity
- signal
- power supply
- input
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Abstract
The utility model provides a flexible starter, which is used in a power supplier. The flexible starter outputs a compensation signal to a pulse width modulation controller when the power supplier is started; the pulse width of a switching signal output by the pulse width modulation controller can generate in an increscent state and can gradually increase to a set value from an initial value. The pulse width can be adjusted according to the state of loads after the starting is finished. Thus, the utility model can be used for avoiding a power switch from resulting in very large voltage and current stress at the moment of starting.
Description
Technical field
A kind of flexible starter of the utility model refers to a kind of being used in the power supply unit especially, the flexible starter of the pulse duration that the switching signal output when power supply unit is started is cumulative.
Background technology
Various power supply units has made widely and has been used to provide the stable output voltage of adjusting.Please refer to Fig. 1, be the circuit box schematic diagram of known power supply unit.Known power supply unit comprises suitching type circuit 30, switching controller 10, outputting inductance L, output capacitance C
1, divider resistance is (by resistance R
1With resistance R
2Composition), compensating network is (by compensating resistance R
3With building-out capacitor C
2Form).Signal V is switched in the output OUT output one of this switching controller 10
PWM, in order to controlling the change action of power switch in this suitching type circuit 30, and then obtain the stable output voltage V of adjusting in the output of power supply unit
O
This switching controller 10 comprises comparator 162, oscillator 168, D flip-flop 166 and error amplifier 160.Wherein oscillator 168 is in order to produce sawtooth voltage V
SAW, this sawtooth voltage V
SAWCan determine switching signal V
PWMSwitching frequency.The anode of error amplifier 160 is connected to reference voltage V
REF, negative terminal is connected to the feedback end FB of power supply unit, receiving feedback signals V
FBError amplifier 160 is according to reference voltage V
REFWith feedback signal V
FBIn order to output compensating signal V
COMComparator 162 is connected to oscillator 168 and error amplifier 160, receives sawtooth signal V
SAWWith compensating signal V
COM, via the logical operation of passing through D flip-flop 166 after the comparison operation again, output switching signal V
PWM, and determine this switching signal V
PWMPulse duration.
Cooperate Fig. 1, please refer to Fig. 2, for known power supply unit at the each point signal waveform schematic diagram that starts moment.When power supply unit starts, the feedback signal V that the feedback end FB of power supply unit receives
FBMinimum, therefore, the very big compensating signal V of error amplifier 160 outputs
COM, the compensating signal V that comparator 162 will be very big
COMWith sawtooth voltage V
SAWAfter comparing computing,, export the switching signal V of very big pulse duration again by the logical operation of D flip-flop 166
PWMIn other words, in starting moment and the still unfounded process of output voltage, switching signal V
PWMPulse duration be maximum, and that output voltage is set up the required time is long more, will cause very big voltage and current stress to power switch.
Summary of the invention
In view of this, a kind of flexible starter of the utility model, be used in the power supply unit, when starting, exports power supply unit a compensating signal to a Pwm controller, the pulse duration of this Pwm controller output switching signal can produce with cumulative state, be increased to set point gradually by initial value, and after startup is finished, adjusted, so can be used to avoid power switch to cause very big voltage and current stress in the moment of starting shooting according to load condition.
For reaching above-mentioned purpose, the utility model provides a kind of flexible starter, is used in the power supply unit, exports a compensating signal to a Pwm controller when this power supply unit starts, and includes: one starts electric capacity; One first power supply is a current source, and it is connected in this startup electric capacity, provides a charging current to start electric capacity to this, in order to this startup electric capacity is charged; One first switch is connected in this a startup electric capacity and an earth terminal, is controlled by a reset signal, in order to this startup electric capacity is discharged; One second source provides a discharging current; One second switch is connected to this startup electric capacity and this second source, is controlled by a guard signal, allows this discharging current that this startup electric capacity is discharged; One voltage regulation unit receives a built-in reference voltage by the one first input end, and one second input is connected to one first output and this startup electric capacity, in order to stablize the reference voltage on this startup electric capacity; One error amplifier, one the 3rd input connects this startup electric capacity and this first output, the one four-input terminal is connected to the feedback end of this power supply unit, one second output is connected to this Pwm controller, receive this reference voltage and a feedback signal, in order to export this compensating signal; And a clamping diode, be connected to this four-input terminal and this second output, the voltage potential of this compensating signal of strangulation when this power supply unit starts.
Wherein, when the voltage potential of this compensating signal started in this power supply unit, its initial value was the conduction voltage drop of this clamping diode.This voltage regulation unit includes: one is differential to input amplifier, is connected to a current source, receive from this first input end and this second input one differential to input signal, in order to produce an output signal; And an output transistor, the one gate terminal is connected to that this is differential to input amplifier, receives this output signal, and to export this reference voltage, a drain electrode end is connected to this first output, and the one source pole end is connected to earth terminal.This output transistor has out the export structure of the drain electrode or the opener utmost point.
The flexible starter that the utility model disclosed when power supply unit is started shooting, uses one first power supply to start electric capacity to one and charges, and set up a reference voltage in starting on the electric capacity; The first input end of one voltage regulation unit receives a built-in reference voltage, second input is connected to first output and this startup electric capacity, this voltage regulation unit has out the export structure of the drain electrode (open-drain) or the opener utmost point (open-collect), makes that the reference voltage on this startup electric capacity is stabilized in the built-in reference voltage;
One error amplifier, its the 3rd input connects this startup electric capacity and first output, receive this reference voltage, the one four-input terminal is connected to the feedback end of power supply unit, to receive a feedback signal, one second output is connected to this Pwm controller, in order to export this compensating signal.One clamping diode is connected to this four-input terminal and this second output, the voltage potential of this compensating signal of strangulation when power supply unit starts.
When power supply unit is started shooting moment, this first power supply charges to this startup electric capacity and is charged to this reference voltage, make this compensating signal increase gradually, thereby make the pulse duration of switching signal be increased to set point gradually by initial value along with the slow rising of this reference voltage.The cumulative purpose that reaches flexible startup of this compensating signal.
Being noted that above general introduction and ensuing detailed description are all exemplary in nature, is in order to further specify claim of the present utility model.And about other purpose of the present utility model and advantage, will be set forth in follow-up explanation and accompanying drawing.
Description of drawings
Fig. 1 is the circuit box schematic diagram of known power supply unit;
Fig. 2 is that known power supply unit is at the each point signal waveform schematic diagram that starts moment;
Fig. 3 is used in the circuit diagram of power supply unit for the utility model flexible starter;
Fig. 4 is that the utility model is at the each point signal waveform schematic diagram that starts moment; And
Fig. 5 is the circuit diagram of the utility model voltage regulation unit.
Wherein, description of reference numerals is as follows:
Known:
10 switching controllers, 160 error amplifiers
162 comparators, 166 D flip-flops
168 oscillator R
1, R
2Resistance
R
3Compensating resistance C
1Output capacitance
C
2Building-out capacitor L outputting inductance
30 suitching type circuit
The utility model:
30 suitching type circuit, 40 flexible starters
C
SSStart electric capacity 402 error amplifiers
403 second switches, 404 clamping diodes
405 first switches, 406 voltage regulation units
4060 current sources, 4061,4062,4063,4064 transistors
4065 resistance, 4066 electric capacity
4067 output transistors, 407 first power supplys
408 second sources, 50 Pwm controllers
502 comparators, 504 oscillators
506 D flip-flop R
1, R
2Resistance
R
3Compensating resistance C
1Output capacitance
C
2Building-out capacitor L outputting inductance
Embodiment
Please refer to Fig. 3, be used in the circuit diagram of power supply unit for the utility model flexible starter.Flexible starter 40 is connected in the feedback end FB of a Pwm controller 50 and power supply unit.Wherein feedback end FB passes through divider resistance (by resistance R
1With resistance R
2Composition) is connected to output voltage V
O
Multiple with reference to figure 3, the utility model flexible starter 40 includes one first power supply 407, and starts capacitor C
SS, a voltage regulation unit 406, an error amplifier 402 and a clamping diode 404.Wherein first power supply 407 is connected to the startup capacitor C
SS, and to starting capacitor C
SSCharge, and on this startup electric capacity, set up a reference voltage V
REF Voltage regulation unit 406 utilizes its first input end (+) to receive built-in reference voltage V
R, and second input (-) is connected to first output and starts capacitor C
SSTo form a unity gain buffer, this voltage regulation unit 406 has out the export structure of the drain electrode (open-drain) or the opener utmost point (open-collect), and then will start capacitor C
SSOn reference voltage V
REFBe stabilized in built-in reference voltage V
RWithin.
The 3rd input (+) of error amplifier 402 is connected to the startup capacitor C
SSWith first output, its four-input terminal (-) is connected to the feedback end FB of power supply unit, and its second output is connected to Pwm controller 50, and error amplifier 402 is with reference voltage V
REFWith feedback signal V
FBError amplify, in order to output compensating signal V
COMClamping diode 404 is connected to four-input terminal (-) and second output, when power supply unit starts, is used for strangulation compensating signal V
COMVoltage potential be the conduction voltage drop V of clamping diode 404
F
In the above-mentioned explanation, start moment, the reference voltage V that error amplifier 402 the 3rd input (+) receives at power supply unit
REFCan be along with starting capacitor C
SSOn charging voltage rise gradually, when it rises to built-in reference voltage V
RThe time enter normal condition.The output voltage current potential of this clamping diode 404 strangulation error amplifier 402 when power supply unit starts simultaneously.That is to say,, be connected to the startup capacitor C starting moment
SSThe 3rd input (+) be connected to the four-input terminal (-) of the feedback end FB of power supply unit, both voltage is all zero volt, by this clamping diode 404 strangulation compensating signal V
COMVoltage potential, make the initial value of output voltage current potential of error amplifier 402 be the conduction voltage drop V of this clamping diode 404
F
If the four-input terminal (-) of error amplifier 402 does not add clamping diode 404 with second output,, be connected to the startup capacitor C starting moment
SSThe voltage of the 3rd input (+) be zero volt, can by error amplifier 402 with voltage gain amplify from the feedback signal that the feedback end FB of power supply unit obtains this moment, makes the compensating signal V of second output output of error amplifier 402
COMThe very fast arrival saturation voltage of meeting, causing does not have the flexible effect that starts.
Multiple this first power supply 407 is a current source with reference to figure 3, in order to this is started capacitor C
SSCharging current is provided.Start moment at power supply unit, this starts capacitor C
SSVoltage rise gradually, this starts capacitor C
SSCan be by the self capacity value in order to plan its start-up time.The startup capacitor C of big capacitance
SSTo increase start-up time, and then it is specified to reduce the voltage and the electric current of power switch.Therefore, this starts capacitor C by rational selection
SSCapacitance, make starting the time of delay that moment causes can be in suitable scope.
Multiple with reference to figure 3, this Pwm controller 50 comprises oscillator 504, comparator 502 and D flip-flop 506.Wherein this oscillator 504 is limited to high critical voltage V in order to produce on one
TH2, be limited to low critical voltage V down
TH1Sawtooth voltage V
SAWThe anode (+) of comparator 502 is connected to second output of error amplifier 402, and its negative terminal (-) is connected to oscillator 504, receives comparison operation compensating signal V simultaneously
COMWith sawtooth signal V
SAW, operation result then is sent to D flip-flop 506, by the logical operation of D flip-flop 506, and output and decision switching signal V
PWMPulse duration.
Cooperate Fig. 3, with reference to figure 4, for the utility model at the each point signal waveform schematic diagram that starts moment.Startup moment during the power supply unit start, cooperate to start capacitor C
SSCharging, starting capacitor C
SSOn reference voltage V
REFBegin to rise by zero volt.Because voltage regulation unit 406 is a unity gain buffer, this voltage regulation unit 406 has out the export structure of the drain electrode (open-drain) or the opener utmost point (open-collect), so reference voltage V
REFMaximum can be stabilized in built-in reference voltage V
RWhen the 3rd input (+) of error amplifier 402 is zero volt, be subjected to the effect that clamping diode 404 has the strangulation voltage potential, second output of error amplifier 402 is clamped at the conduction voltage drop V of this clamping diode 404
F(generally about 0.7V), the conduction voltage drop V of this moment
FStill be lower than sawtooth signal V
SAWLow critical voltage V
TH1At the same time, along with reference voltage V
REFRising gradually, compensating signal V
COMAlso increase gradually.Starting capacitor C
SSCharging process in, switching signal V
PWMPulse duration begin slowly to increase by initial value, up to reference voltage V
REFReach built-in reference voltage V
R, the pulse duration of this moment reaches set point, and is adjusted according to load condition after startup is finished, thereby reaches flexible startup.
Please refer to Fig. 5, be the circuit diagram of the utility model voltage regulation unit.This voltage regulation unit 406 is brought in external circuitry by first input end (+), second input (-) and first output and is connected, its inside include by transistor 4061,4062,4063 and 4064 formed one differential to input amplifier (differential-pair input amplifier), current source 4060, resistance 4065, electric capacity 4066 and output transistor 4067.Wherein differential input amplifier is connected to current source 4060, and receive by the first input end (+) and second input (-) one differential to input signal, in order to produce an output signal V
OUTThe gate terminal of output transistor 4067 is connected to differential to input amplifier, receives this output signal V
OUTTo produce amplifying signal, be this reference voltage V
REFThe drain electrode end of output transistor 4067 is connected to this first output, and its source terminal is connected to earth terminal.It is resistance 4065 and electric capacity 4066 that the gate terminal of output transistor 4067 and drain electrode end are connected with a RC circuit, in order to the effect that affords redress.This drain electrode end of this output transistor 4067 is connected to first output of this voltage regulation unit 406, in order to the export structure of the drain electrode (open-drain) or the opener utmost point (open-collect) to be provided out.
Multiple with reference to figure 3, wherein the utility model also includes first switch 405 and is connected in this startup capacitor C
SSWith earth terminal.When power supply unit does not provide power output, according to feedback signal V
FBVoltage potential, in order to output reset signal RST controlling 405 conductings of first switch, and then to starting capacitor C
SSDischarge and start the purpose of resetting to reach.Other has second source 408 to be connected to the startup capacitor C by second switch 403
SS, according to the switching of second switch 403, in order to provide discharging current to starting capacitor C
SSDischarge.The switching of second switch 403 is controlled by guard signal PTN.When power supply unit generation overpower, short circuit and overvoltage, according to feedback signal V
FBVoltage potential, in order to output protection signal PTN, and to starting capacitor C
SSDischarge, to reach the purpose of protection.
In sum, a kind of flexible starter of the utility model, be used in the power supply unit, and when starting, exports power supply unit compensating signal to Pwm controller, the pulse duration of this Pwm controller output switching signal can produce with cumulative state, be increased to set point gradually by initial value, and after startup is finished, adjusted, so can be used to avoid power switch to cause very big voltage and current stress in the moment of starting shooting according to load condition.
Yet the above, only be the detailed description and the accompanying drawing of one the specific embodiment of the utility model the best, feature of the present utility model is not limited thereto, be not in order to restriction the utility model, all scopes of the present utility model should be as the criterion with following claim, all closing in the embodiment of the spirit variation similar of the utility model claim with it, all should be contained in the category of the present utility model, any those skilled in the art in field of the present utility model, can think easily and variation or modify and all can be encompassed in following claim of the present utility model.
Claims (4)
1. a flexible starter is used in the power supply unit, exports a compensating signal to a Pwm controller when this power supply unit starts, and it is characterized in that including:
One starts electric capacity;
One first power supply is a current source, and it is connected in this startup electric capacity, provides a charging current to start electric capacity to this, in order to this startup electric capacity is charged;
One first switch is connected in this a startup electric capacity and an earth terminal, is controlled by a reset signal, in order to this startup electric capacity is discharged;
One second source provides a discharging current;
One second switch is connected to this startup electric capacity and this second source, is controlled by a guard signal, allows this discharging current that this startup electric capacity is discharged;
One voltage regulation unit receives a built-in reference voltage by the one first input end, and one second input is connected to one first output and this startup electric capacity, in order to stablize the reference voltage on this startup electric capacity;
One error amplifier, one the 3rd input connects this startup electric capacity and this first output, the one four-input terminal is connected to the feedback end of this power supply unit, one second output is connected to this Pwm controller, receive this reference voltage and a feedback signal, in order to export this compensating signal; And
One clamping diode is connected to this four-input terminal and this second output, the voltage potential of this compensating signal of strangulation when this power supply unit starts.
2. flexible starter as claimed in claim 1 is characterized in that, when the voltage potential of this compensating signal started in this power supply unit, its initial value was the conduction voltage drop of this clamping diode.
3. flexible starter as claimed in claim 1 is characterized in that, this voltage regulation unit includes:
One is differential to input amplifier, is connected to a current source, receive from this first input end and this second input one differential to input signal, in order to produce an output signal; And
One output transistor, one gate terminal are connected to that this is differential to input amplifier, receive this output signal, and to export this reference voltage, a drain electrode end is connected to this first output, and the one source pole end is connected to earth terminal.
4. flexible starter as claimed in claim 3 is characterized in that, this output transistor has out the export structure of the drain electrode or the opener utmost point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200030751U CN2774005Y (en) | 2005-02-28 | 2005-02-28 | Flexible starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200030751U CN2774005Y (en) | 2005-02-28 | 2005-02-28 | Flexible starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2774005Y true CN2774005Y (en) | 2006-04-19 |
Family
ID=36709267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200030751U Expired - Fee Related CN2774005Y (en) | 2005-02-28 | 2005-02-28 | Flexible starter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2774005Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100423433C (en) * | 2005-02-07 | 2008-10-01 | 崇贸科技股份有限公司 | Flexible starter |
| CN102255480A (en) * | 2010-05-17 | 2011-11-23 | 登丰微电子股份有限公司 | Power conversion device and pulse width modulation signal control device thereof |
| CN109861688A (en) * | 2018-12-29 | 2019-06-07 | 成都锐成芯微科技股份有限公司 | A kind of clock generation circuit |
-
2005
- 2005-02-28 CN CNU2005200030751U patent/CN2774005Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100423433C (en) * | 2005-02-07 | 2008-10-01 | 崇贸科技股份有限公司 | Flexible starter |
| CN102255480A (en) * | 2010-05-17 | 2011-11-23 | 登丰微电子股份有限公司 | Power conversion device and pulse width modulation signal control device thereof |
| CN109861688A (en) * | 2018-12-29 | 2019-06-07 | 成都锐成芯微科技股份有限公司 | A kind of clock generation circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060419 |