CN206422948U - The LED dimming driving circuits and Switching Power Supply of a kind of closed loop framework - Google Patents
The LED dimming driving circuits and Switching Power Supply of a kind of closed loop framework Download PDFInfo
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- CN206422948U CN206422948U CN201621492422.6U CN201621492422U CN206422948U CN 206422948 U CN206422948 U CN 206422948U CN 201621492422 U CN201621492422 U CN 201621492422U CN 206422948 U CN206422948 U CN 206422948U
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Abstract
The utility model is there is provided the LED dimming driving circuits and Switching Power Supply of a kind of closed loop framework, the Switching Power Supply for including power switch and energy-storage units, including：Sample circuit, circuit for signal conditioning and turn-on time generation circuit.Wherein, sample circuit receives the first signal of the output current for characterizing Switching Power Supply.Circuit for signal conditioning receives the first signal and a reference signal, and the first signal is adjusted so that the first signal convergence is equal to the reference signal, and produces a Regulate signal.Turn-on time generation circuit produces the first ON time signal of power switch according to Regulate signal.It can be seen that, this programme provide light adjusting circuit be closed loop circuit, when detect output current be less than light modulator rated value when, the peak value of external inductance can be increased so that output current is not less than default rated value, therefore, when avoiding electric in wide-angle, the problem of there is power down stream.
Description
Technical field
The utility model is related to field of switch power, in particular, is the LED light modulation drivings for being related to a kind of closed loop framework
Circuit and Switching Power Supply.
Background technology
With developing rapidly for electronics and information industry, Switching Power Supply is widely used in computer, power equipment, instrument
The fields such as instrument, LED illumination, medicine equipment, military industry equipment.Generally, Switching Power Supply be by external AC (such as civil power 220V,
380V etc.) galvanic current is converted into supply load.
However, being continuously increased with user's request, light modulation turns into a developing direction, at present, LED light modulation needs to lead to
Light modulator is crossed to be adjusted the electric current of circuit, but, in the system of light modulator is connected to, generally in system electrification, light modulator
Existing certain light modulation angle, at this moment output current can form power down, and then be less than the rated value of light modulator so that light modulator can not
Normal work, it is impossible to meet products standards.
Utility model content
In view of this, the utility model provides the LED dimming driving circuits and Switching Power Supply of a kind of closed loop framework, with
When overcoming electric in wide-angle in the prior art, the problem of there is power down stream.
To achieve the above object, the utility model provides following technical scheme：
A kind of LED dimming driving circuits of closed loop framework, the Switching Power Supply for including power switch and energy-storage units, institute
Stating LED dimming driving circuits includes：Power switch pipe cut-off time control circuit, power switch pipe turn-on instant control circuit with
And power switch tube drives circuit, power switch pipe cut-off time control circuit includes：Sample circuit, Signal Regulation electricity
Road and turn-on time generation circuit；
The sample circuit, receives the first signal of the output current for characterizing the Switching Power Supply；
The circuit for signal conditioning, receives first signal and a reference signal, and first signal is adjusted
Section so that the first signal convergence is equal to the reference signal, and produces a Regulate signal；
The turn-on time generation circuit, believes according to the first ON time that the Regulate signal produces the power switch
Number.
It is preferred that, the circuit for signal conditioning, including：It is averaging circuit, error amplifier and compensation circuit；
The averaging circuit, receives the voltage peak of first signal, and average value fortune is carried out to the voltage peak
Calculate, obtain the first average value signal；
The error amplifier, relatively first average value signal and the reference signal, make described first to be averaged
Value signal levels off to the reference signal, and exports a comparison signal；
The compensation circuit, receives the comparison signal of the error amplifier output, the comparison signal is carried out
Compensation operation, exports the Regulate signal.
It is preferred that, the circuit for signal conditioning, in addition to：Clamp circuit；
The clamp circuit, by the Regulate signal clamper in a pre-set value.
It is preferred that, the turn-on time generation circuit also includes ON time adjustment unit；
The ON time adjustment unit, when producing the cut-off of a control power switch pipe according to the first predetermined current
The the second ON time signal carved.
It is preferred that, in addition to：Depth light adjusting circuit, the depth light adjusting circuit includes：Dutycycle sample circuit and letter
Number change-over circuit；
The dutycycle sample circuit, the dutycycle for the Switching Power Supply of sampling；
The duty cycle signals are converted to the first electric signal by the signaling conversion circuit, and first electric signal is added in
In the turn-on time generation circuit, believed with producing the 3rd ON time of cut-off time of the control power switch pipe
Number.
It is preferred that, the sample circuit, including：First switch pipe and the first electric capacity；
The first end of the first switch pipe is used as the input of the sample circuit, the output end of the first switch pipe
It is connected with the first end of first electric capacity, and is used as the output end of the sample circuit, the second termination of first electric capacity
Ground, the control of the first switch pipe terminates the first ON time signal.
It is preferred that, the averaging circuit includes：Second switch pipe, the 3rd switching tube and the first phase inverter；
The first end of the second switch pipe is used as the input for being averaging circuit, the second of the second switch pipe
End is connected with the first end of the 3rd switching tube, and as the output end of the averaging circuit, the second switch pipe
Control end receives the first deadline signal that the power switch pipe turn-on instant control circuit is produced, during first cut-off
Between signal be connected by first phase inverter with the control end of the 3rd switching tube, the 3rd switching tube second termination
Ground.
It is preferred that, the compensation circuit includes：Compensating electric capacity；
The first end of the compensating electric capacity is connected with the output end of the error amplifier, the second end of the compensating electric capacity
Ground connection.
It is preferred that, the clamp circuit includes：Clamp diode；
The plus earth of the clamp diode, the output end of the negative electrode of the clamp diode and the error amplifier
It is connected, and is used as the output end of the circuit for signal conditioning.
It is preferred that, the ON time adjustment unit includes：Adjust resistance, current source, the second electric capacity and the 4th switch
Pipe；
The first end of the regulation resistance as the ON time adjustment unit input, the of the regulation resistance
Two ends are connected with the control end of the current source, and the current source is connected with second electric capacity, the 4th switching tube and institute
The parallel connection of the second electric capacity is stated, the control end of the 4th switching tube receives the inverted signal of the first ON time signal.
It is preferred that, the dutycycle sample circuit includes：Peak value sampling circuit and first comparator,
The input of the peak value sampling circuit is connected with the input of the sample circuit, and output end compares with described first
Inverting input compared with device is connected, and the input in the same direction of the first comparator is connected with the output end of the sample circuit, uses
In the input terminal voltage and output end voltage of relatively more described sample circuit, and produce the duty cycle signals.
It is preferred that, the signaling conversion circuit includes：Wave filter, operational amplifier, the 5th switching tube and current mirror,
The input of the wave filter as the signaling conversion circuit input, with the dutycycle sample circuit
Output end is connected, and the output end of the wave filter is connected with the first input end of the operational amplifier, the operational amplifier
The second input be connected with the output end of the 5th switching tube, the output end of the operational amplifier with the described 5th switch
The control end of pipe is connected, and the input of the 5th switching tube is connected with the input of the current mirror, the current mirror it is defeated
Go out end as the output end of the signaling conversion circuit, export first electric signal.
It is preferred that, the turn-on time generation circuit also includes：Second comparator and OR gate；
The first input end of second comparator is used as the input of the turn-on time generation circuit, second ratio
The second input compared with device is connected with the output end of the ON time adjustment unit, the output end of second comparator and institute
The first input end for stating OR gate is connected, and the second input of the OR gate receives the front end letter of the first ON time signal
Number, the output end of the OR gate as the turn-on time generation circuit output end.
A kind of Switching Power Supply, including the above-mentioned LED dimming driving circuits of any one.
Understood via above-mentioned technical scheme, compared with prior art, the utility model provides a kind of closed loop framework
LED dimming driving circuits, the Switching Power Supply for including power switch and energy-storage units, the LED dimming driving circuits include：
Power switch pipe cut-off time control circuit, power switch pipe turn-on instant control circuit and power switch tube drives circuit,
Wherein, the power switch pipe cut-off time control circuit includes：Sample circuit, circuit for signal conditioning and ON time production
Raw circuit.Wherein, sample circuit receives the first signal of the output current for characterizing the Switching Power Supply.Circuit for signal conditioning, connects
First signal and a reference signal are received, and first signal is adjusted so that the first signal convergence is equal to
The reference signal, and produce a Regulate signal.Turn-on time generation circuit, the power switch is produced according to the Regulate signal
The first ON time signal.It can be seen that, the light adjusting circuit that this programme is provided is closed loop circuit, is less than tune when detecting output current
During the rated value of light device, the peak value of external inductance can be increased so that output current is not less than default rated value, therefore, it is to avoid
In wide-angle during electricity, the problem of there is power down stream.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is embodiment of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to the accompanying drawing of offer.
A kind of structural representation for Switching Power Supply that Fig. 1 provides for the present embodiment；
A kind of structural representation for LED dimming driving circuits that Fig. 2 provides for the present embodiment；
The structural representation for another LED dimming driving circuit that Fig. 3 provides for the present embodiment；
The structural representation for another LED dimming driving circuit that Fig. 4 provides for the present embodiment；
The structural representation for another LED dimming driving circuit that Fig. 5 provides for the present embodiment；
The structural representation for another LED dimming driving circuit that Fig. 6 provides for the present embodiment；
The structural representation for another LED dimming driving circuit that Fig. 7 provides for the present embodiment；
The structural representation for another LED dimming driving circuit that Fig. 8 provides for the present embodiment；
The structural representation for another LED dimming driving circuit that Fig. 9 provides for the present embodiment；
The structural representation for another LED dimming driving circuit that Figure 10 provides for the present embodiment；
A kind of dimming process schematic diagram for LED dimming driving circuits that Figure 11 provides for the present embodiment；
A kind of schematic diagram of the peak value for LED dimming driving circuits collection CS signals that Figure 12-Figure 15 provides for the present embodiment；
Figure 16 is the dimming curve figure of the LED dimming driving circuits provided using the present embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
Referring to Fig. 1, a kind of structural representation of the Switching Power Supply provided for the present embodiment, wherein, including：Light modulator
Dimmer, primary side winding, load LED, resistance and driving chip, the driving chip include power switch pipe Drain with
And multiple input ports, such as CS, RT, Comp, Vcc and GND.
Wherein, as shown in Fig. 2 the present embodiment provide a kind of LED dimming driving circuits, including：Power switch pipe is turned off
Control circuit 10, power switch pipe turn-on control circuit 20 and power switch tube drives circuit 30.Specifically, the present embodiment
Power switch pipe is switched off control circuit again and 10 is introduced, as shown in figure 3, including：Sample circuit 101, circuit for signal conditioning
102 and turn-on time generation circuit 103.
Wherein, the sample circuit receives the first signal of the output current for characterizing the Switching Power Supply.Signal Regulation electricity
Road receives first signal and a reference signal, and first signal is adjusted so that the first signal convergence
Equal to the reference signal, and produce a Regulate signal.Turn-on time generation circuit, the power is produced according to the Regulate signal
First ON time signal of switch.
It can be seen that, the light adjusting circuit that this programme is provided is closed loop circuit, when the first signal for detecting sign output current is small
When reference signal (rated value of light modulator), the first ON time of the power switch can be produced according to the Regulate signal
Signal Tonp, and then increase the peak value of output voltage so that output current is not less than default rated value, therefore, it is to avoid big
When electric in angle, the problem of there is power down stream.
On the basis of above-described embodiment, as shown in figure 4, present embodiments providing a kind of specific reality of circuit for signal conditioning
Existing circuit, the regulation circuit 102 includes：It is averaging circuit 1021, error amplifier 1022 and compensation circuit 1023.
Wherein, it is described to be averaging the voltage peak that circuit 1021 receives first signal, the voltage peak is carried out
Average value computing, obtains the first average value signal.Error amplifier 1022 compares first average value signal and the base
Calibration signal, makes first average value signal level off to the reference signal, and exports a comparison signal.Compensation circuit 1023 connects
The comparison signal of the error amplifier output is received, computing is compensated to the comparison signal, the regulation letter is exported
Number.
On the basis of above-described embodiment, as shown in figure 5, the circuit for signal conditioning 102, in addition to：Clamp circuit
1024.The clamp circuit is used for the Regulate signal clamper in a pre-set value (such as VHcomp, i.e. the first ON time signal
Tonp maximum is clamped, and rear extended meeting is discussed in detail).
Optionally, as shown in fig. 6, the turn-on time generation circuit 103 also includes ON time adjustment unit 1031.Its
In, ON time adjustment unit is led according to the second of the cut-off time of the control power switch pipe of the first predetermined current generation one
Logical time signal.
Specifically, referring to Fig. 7, present embodiments provide the circuit that implements of each circuit, it is as follows：
The sample circuit 101, including：First switch pipe SW1 and the first electric capacity C1.
Wherein, the first end of the first switch pipe SW1 is as the input of the sample circuit 101, and described first opens
The output end for closing pipe SW1 is connected with the first end of the first electric capacity C1, and is used as the output end Vcs of the sample circuit, institute
The first electric capacity C1 the second end ground connection is stated, the control of the first switch pipe terminates the first ON time signal Tonp.
The averaging circuit includes：Second switch pipe SW2, the 3rd switching tube SW3 and the first phase inverter A1.
Wherein, the first end of the second switch pipe SW2 is used as the input for being averaging circuit 1021, described second
Switching tube SW2 the second end is connected with the first end of the 3rd switching tube SW3, and is used as the output of the averaging circuit
End, the control end of the second switch pipe SW2 receives the first cut-off that the power switch pipe turn-on instant control circuit is produced
Time signal Tons (it should be noted that the present embodiment is Buck-Boost frameworks, and such as under Buck system architectures, Ying Shi
Tons+Tonp), the control that the first deadline signal passes through the first phase inverter A1 and the 3rd switching tube SW3
End is connected, the second end ground connection of the 3rd switching tube SW3.
The compensation circuit 1023 includes：Compensating electric capacity Ccomp.
The first end of the compensating electric capacity Ccomp is connected with the output end of the error amplifier Gm, the compensating electric capacity
Ccomp the second end ground connection.
The clamp circuit 1025 includes：Clamp diode；
The plus earth of the clamp diode, the negative electrode of the clamp diode Hclamp and the error amplifier Gm
Output end be connected, and be used as the output end of the circuit for signal conditioning 102.
The ON time adjustment unit 1031 includes：Adjust resistance RT, current source I1, the second electric capacity C2 and the 4th
Switching tube SW4；
The first end of the regulation resistance RT is used as the input of the ON time adjustment unit, the regulation resistance RT
The second end be connected with the control end of the current source I1, the current source I1 connects with the second electric capacity C2, the described 4th
Switching tube SW4 is in parallel with the second electric capacity C2, and the control end of the 4th switching tube SW4 receives the first ON time letter
Number Tonp inverted signal.
The turn-on time generation circuit 103 also includes：Second comparator Comp and OR gate OR；
The first input end of the second comparator Comp as the turn-on time generation circuit input, described
Two comparator Comp the second input is connected with the output end of the ON time adjustment unit, the second comparator Comp
Output end be connected with the first input end of the OR gate OR, when the second input of the OR gate OR receives first conducting
Between signal front end signal Tonp LEB, the OR gate OR output end as the turn-on time generation circuit output end.
Specifically, with reference to the annexation and Figure 11 of foregoing circuit, the power switch pipe shut-off control that the present embodiment is provided
The operation principle of circuit processed is：
The collection of CS ends characterizes the magnitude of voltage of output current, and the magnitude of voltage is kept, by averaging circuit to the electricity
Pressure value carries out averaging processing, obtains voltage signal VN, and VN is compared with reference signal Vref so that VN levels off to base
Calibration signal Vref, and the Regulate signal clamper that error amplifier Gm is exported is to a fixed value, such as VHcomp.And due toSo Tonpmax is clamped at the maximum of a fixation.
Afterwards, by adjusting RT resistance so that the electric current on RT is preset value, by the function of current to current source I1, is made
Current source I1 output current is equal to preset value, and carries out discharge and recharge to electric capacity C2, and the second ratio is applied to produce a triangular wave
Input in the same direction compared with device Comp.
With the increase of the light modulation angle of light modulator, i.e. Tonp2 ＞ Tonp1 so that output current is consistently equal to without light modulation
Electric current during device.When tonp is increasing, when tonp=tonpmax, i.e., tonp is in tonp3's and tonp4 in figure
Period, output current reduces with the reduction of light modulation angle.
In addition, in this programme, by the current value sampled on external inductance, being adjusted to tonp, integrated circuit is one
Closed loop configuration, i.e. tonp are not a fixed values in different light modulation angles, it is to avoid defeated in the prior art in high current during electricity
The problem of going out electric current power down.
Except this, on the basis of above-described embodiment, the present embodiment additionally provides depth light adjusting circuit 104, as shown in Figure 8.
Specifically, the depth light adjusting circuit includes：Dutycycle sample circuit 1041 and signaling conversion circuit 1042, as shown in Figure 9.
Wherein, the dutycycle sample circuit 1041 is sampled the dutycycle of the Switching Power Supply.The signaling conversion circuit
1042, the duty cycle signals are converted into the first electric signal, first electric signal is added in the turn-on time generation circuit
In, with the 3rd ON time signal for the cut-off time for producing the control power switch pipe.
Specifically, as shown in Figure 10, the dutycycle sample circuit includes：Peak value sampling circuit and first comparator,
Wherein, the input of the peak value sampling circuit is connected with the input of the sample circuit, output end with it is described
The inverting input of first comparator is connected, the input in the same direction of the first comparator and the output end phase of the sample circuit
Even, for comparing the input terminal voltage and output end voltage of the sample circuit, and the duty cycle signals are produced.
The signaling conversion circuit includes：Wave filter, operational amplifier, the 5th switching tube and current mirror.
Wherein, the input of the wave filter is sampled as the input of the signaling conversion circuit with the dutycycle
The output end of circuit is connected, and the output end of the wave filter is connected with the first input end of the operational amplifier, the computing
Second input of amplifier is connected with the output end of the 5th switching tube, the output end of the operational amplifier and described the
The control end of five switching tubes is connected, and the input of the 5th switching tube is connected with the input of the current mirror, the electric current
The output end of mirror exports first electric signal, first described in the present embodiment as the output end of the signaling conversion circuit
Electric signal is a current signal.
With reference to Figure 12-Figure 15, the operation principle of the depth light adjusting circuit provided the present embodiment is illustrated, wherein,
Vcspk refers to the maximum potential at CS ends in power frequency period, and Vcs refers to the envelope of CS terminal voltages in power frequency period.
Duty signals are as follows with the relation of corner cut information：
The Duty of θ ＞ 150 (θ)=1- (180-30-30)/180
150>The Duty of θ ＞ 90 (θ)=1- (θ -30)/180
90>The Duty of θ ＞ 0 (θ)=1- (θ-arcsin (0.5*sin θ))/180
After 150 degree, with the change of corner cut, the dutycycle of Duty signals changes always, i.e. Duty (θ), which is reflected, to be cut
The situation at angle.And before 150 degree, the dutycycle of Duty signals is constant, so the corner cut change before 150 degree will not be detected
Arrive.
In Figure 10, after the Duty signals under obtaining a certain corner cut, Duty signals are converted into by a wave filter
Vduty signals.Because the dutycycle of Duty signals reflects corner cut now, this duty cycle signals is converted into one by wave filter
Individual voltage signal Vduty, and the bigger Vduty values of dutycycle of Duty signals are bigger.Vduty signals turn by a voltage again
Current module produces the generation that Iduty electric currents influence the Tonpmax of final chip internal.Tonpmax signals directly determine core
The size of the output current of piece control.So the intervention of Vduty signals can influence defeated under final output current, different corner cuts
Go out electric current difference, can obtain the dimming curve of an amendment, as shown in figure 16.It should be noted that Figure 10 is a Duty
Produce and Duty influences the embodiment of dimming curve, the method that duty is produced there are many kinds, such as Vcs is more than a certain specific voltage
Etc.；The method of Duty influence dimming curves also has many kinds, such as is gone to influence the Vref signal in integral loop with duty,
The present embodiment is without specific restriction.
Because the Tonpmax after being adjusted by duty signals is：
Tonpmax=(Vcomphclamp × C1)/(IRT+Iduty)
It can be seen that, Iduty increases with the reduction of light modulation angle, then Tonpmax can subtract with the reduction of light modulation angle
It is small, and then output current becomes smaller with the reduction of light modulation angle afterwards.
Except this, the present embodiment additionally provides a kind of Switching Power Supply, including any one LED light modulation drives in above-described embodiment
Dynamic circuit.
In summary：The utility model provides a kind of LED dimming driving circuits of closed loop framework, for being opened including power
Pass and the Switching Power Supply of energy-storage units, the LED dimming driving circuits include：Power switch pipe cut-off time control circuit, work(
Rate switching tube turn-on instant controls circuit and power switch tube drives circuit, wherein, the power switch pipe cut-off time control
Circuit processed includes：Sample circuit, circuit for signal conditioning and turn-on time generation circuit.Wherein, sample circuit, which is received, characterizes institute
State the first signal of the output current of Switching Power Supply.Circuit for signal conditioning, receives first signal and a reference signal, and right
First signal is adjusted so that the first signal convergence is equal to the reference signal, and produces a Regulate signal.Conducting
Time generation circuit, the first ON time signal of the power switch is produced according to the Regulate signal.It can be seen that, this programme is carried
The light adjusting circuit of confession be closed loop circuit, when detect output current be less than light modulator rated value when, external inductance can be increased
, there is asking for power down stream in peak value so that output current is not less than default rated value, therefore, it is to avoid big during electricity in wide-angle
Topic.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.The device provided for embodiment
For, because it is corresponding with the method that embodiment is provided, so description is fairly simple, related part is said referring to method part
It is bright.
To the described above of the embodiment provided, professional and technical personnel in the field are enable to realize or new using this practicality
Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can in other embodiments be realized in the case where not departing from spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principle provided in this article
The most wide scope consistent with features of novelty.
Claims (14)
1. a kind of LED dimming driving circuits of closed loop framework, the Switching Power Supply for including power switch and energy-storage units is described
LED dimming driving circuits include：Power switch pipe cut-off time control circuit, power switch pipe turn-on instant control circuit and
Power switch tube drives circuit, it is characterised in that the power switch pipe cut-off time control circuit includes：Sample circuit, letter
Number regulation circuit and turn-on time generation circuit；
The sample circuit, receives the first signal of the output current for characterizing the Switching Power Supply；
The circuit for signal conditioning, receives first signal and a reference signal, and first signal is adjusted, and makes
Obtain the first signal convergence and be equal to the reference signal, and produce a Regulate signal；
The turn-on time generation circuit, the first ON time signal of the power switch is produced according to the Regulate signal.
2. LED dimming driving circuits according to claim 1, it is characterised in that the circuit for signal conditioning, including：Ask
Average circuit, error amplifier and compensation circuit；
The averaging circuit, receives the voltage peak of first signal, carries out average value computing to the voltage peak, obtains
To the first average value signal；
The error amplifier, relatively first average value signal and the reference signal, believe first average value
Number level off to the reference signal, and export a comparison signal；
The compensation circuit, receives the comparison signal of the error amplifier output, the comparison signal is compensated
Computing, exports the Regulate signal.
3. LED dimming driving circuits according to claim 2, it is characterised in that the circuit for signal conditioning, in addition to：
Clamp circuit；
The clamp circuit, by the Regulate signal clamper in a pre-set value.
4. LED dimming driving circuits according to claim 1, it is characterised in that the turn-on time generation circuit is also wrapped
Include ON time adjustment unit；
The ON time adjustment unit, the cut-off time of a control power switch pipe is produced according to the first predetermined current
Second ON time signal.
5. LED dimming driving circuits according to claim 1, it is characterised in that also include：Depth light adjusting circuit, it is described
Depth light adjusting circuit includes：Dutycycle sample circuit and signaling conversion circuit；
The dutycycle sample circuit, the dutycycle for the Switching Power Supply of sampling；
The duty cycle signals are converted to the first electric signal by the signaling conversion circuit, and first electric signal is added in described
In turn-on time generation circuit, with the 3rd ON time signal for the cut-off time for producing the control power switch pipe.
6. LED dimming driving circuits according to claim 1, it is characterised in that the sample circuit, including：First opens
Close pipe and the first electric capacity；
The first end of the first switch pipe is used as the input of the sample circuit, the output end of the first switch pipe and institute
The first end for stating the first electric capacity is connected, and as the output end of the sample circuit, the second end of first electric capacity is grounded, institute
The control for stating first switch pipe terminates the first ON time signal.
7. LED dimming driving circuits according to claim 2, it is characterised in that the averaging circuit includes：Second opens
Guan Guan, the 3rd switching tube and the first phase inverter；
The first end of the second switch pipe as it is described averaging circuit input, the second end of the second switch pipe with
The first end of 3rd switching tube is connected, and is used as the output end of the averaging circuit, the control of the second switch pipe
End receives the first deadline signal that the power switch pipe turn-on instant control circuit is produced, the first deadline letter
Number it is connected by first phase inverter with the control end of the 3rd switching tube, the second end ground connection of the 3rd switching tube.
8. LED dimming driving circuits according to claim 2, it is characterised in that the compensation circuit includes：Compensation electricity
Hold；
The first end of the compensating electric capacity is connected with the output end of the error amplifier, the second termination of the compensating electric capacity
Ground.
9. LED dimming driving circuits according to claim 3, it is characterised in that the clamp circuit includes：The pole of clamper two
Pipe；
The plus earth of the clamp diode, the output end phase of the negative electrode of the clamp diode and the error amplifier
Connect, and be used as the output end of the circuit for signal conditioning.
10. LED dimming driving circuits according to claim 4, it is characterised in that the ON time adjustment unit bag
Include：Adjust resistance, current source, the second electric capacity and the 4th switching tube；
The first end of the regulation resistance is used as the input of the ON time adjustment unit, the second end of the regulation resistance
It is connected with the control end of the current source, the current source is connected with second electric capacity, the 4th switching tube and described the
Two electric capacity are in parallel, and the control end of the 4th switching tube receives the inverted signal of the first ON time signal.
11. LED dimming driving circuits according to claim 5, it is characterised in that the dutycycle sample circuit includes：
Peak value sampling circuit and first comparator,
The input of the peak value sampling circuit is connected with the input of the sample circuit, output end and the first comparator
Inverting input be connected, the input in the same direction of the first comparator is connected with the output end of the sample circuit, for than
The input terminal voltage and output end voltage of the sample circuit, and produce the duty cycle signals.
12. LED dimming driving circuits according to claim 5, it is characterised in that the signaling conversion circuit includes：Filter
Ripple device, operational amplifier, the 5th switching tube and current mirror,
The input of the wave filter is as the input of the signaling conversion circuit, the output with the dutycycle sample circuit
End is connected, and the output end of the wave filter is connected with the first input end of the operational amplifier, and the of the operational amplifier
Two inputs are connected with the output end of the 5th switching tube, the output end of the operational amplifier and the 5th switching tube
Control end is connected, and the input of the 5th switching tube is connected with the input of the current mirror, the output end of the current mirror
As the output end of the signaling conversion circuit, first electric signal is exported.
13. LED dimming driving circuits according to claim 4, it is characterised in that the turn-on time generation circuit is also wrapped
Include：Second comparator and OR gate；
The first input end of second comparator is used as the input of the turn-on time generation circuit, second comparator
The second input be connected with the output end of the ON time adjustment unit, the output end of second comparator with it is described or
The first input end of door is connected, and the second input of the OR gate receives the front end signal of the first ON time signal, institute
The output end for stating OR gate is used as the output end of the turn-on time generation circuit.
14. a kind of Switching Power Supply, it is characterised in that including the LED light modulation driving electricity as described in claim 1-13 any one
Road.
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| CN108271285A (en) * | 2016-12-30 | 2018-07-10 | 上海新进半导体制造有限公司 | The LED dimming driving circuits and Switching Power Supply of a kind of closed loop framework |
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Effective date of registration: 20210203 Address after: No. 1600, Zixing Road, Minhang District, Shanghai 200241 Patentee after: BCD (SHANGHAI) MICRO-ELECTRONICS Ltd. Address before: No. 1600, Zixing Road, Minhang District, Shanghai 200241 Patentee before: BCD Semiconductor Manufacturing Ltd. Patentee before: BCD (SHANGHAI) MICRO-ELECTRONICS Ltd. |