CN107172750A - Control circuit and lighting device - Google Patents
Control circuit and lighting device Download PDFInfo
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- CN107172750A CN107172750A CN201710433689.0A CN201710433689A CN107172750A CN 107172750 A CN107172750 A CN 107172750A CN 201710433689 A CN201710433689 A CN 201710433689A CN 107172750 A CN107172750 A CN 107172750A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides one kind control circuit and lighting device, circuit is controlled to include reduction voltage circuit, mean value calculation circuit, dimming interface circuit, discharge circuit, logic circuit, clock signal generators, sampling unit and detection unit, wherein, mean value calculation circuit is based on inductive current peak and inductive current conducting ratio calculates inductive current average value.The inductive current reference value of average value and dimming interface circuit input of the discharge circuit based on inductive current is compared, and is exported comparative result as the first output signal to logic circuit；The shut-off and conducting of first switch in the clock signal control reduction voltage circuit that logic circuit is inputted based on the first output signal and clock signal generators, and by the size for the duty cycle adjustment inductive current for controlling the first switch in reduction voltage circuit, and then adjust the size of current with the load of inductance connection.Above-mentioned control circuit is simple and convenient, and it is wide to be provided with the lighting device dimming scope of the control circuit, with low cost.
Description
Technical field
The present invention relates to lighting field, more particularly to a kind of control circuit and lighting device.
Background technology
At present, due to reduction voltage circuit because component number is few, high conversion efficiency, and be adapted to be transformed into from high input voltage
Low pressure is exported, and is increasingly widely used in LED drive circuit.
But, reduction voltage circuit is operated in critical current pattern, and its working frequency is with input voltage, load change
, with the increase of light modulation depth, the working frequency of reduction voltage circuit is also rising, when working frequency is sufficiently high, control
The signal delay that circuit is produced can extreme influence circuit work, inductive current is no longer critical mode of operation, current peak with
Average value also no longer linearly, output current can not further reduction proportional to the first output signal, so as to limit
The dimming scope of circuit.
The content of the invention
Circuit and lighting device are controlled the invention provides one kind to overcome above mentioned problem or solve at least in part
State problem.
According to an aspect of the invention, there is provided a kind of control circuit, including reduction voltage circuit, the reduction voltage circuit bag
Include：First switch, inductance, the inductance are connected with the first switch；
The control circuit also includes：Mean value calculation circuit, dimming interface circuit, discharge circuit, logic circuit, clock
Signal generator, sampling unit and detection unit, wherein,
The sampling unit is connected with the first switch, gathers the inductive current peak of the reduction voltage circuit, and by institute
Inductive current peak is stated to input to the mean value calculation circuit；
The detection unit is connected to the reduction voltage circuit, detects the inductive current conducting ratio of the reduction voltage circuit, and
Inductive current conducting ratio is inputted into the mean value calculation circuit；
The inductive current peak and the detection unit that the mean value calculation circuit is inputted based on the sampling unit are defeated
The inductive current conducting ratio entered calculates inductive current average value, and the inductive current average value is inputted to the fortune
Electric discharge road；
The dimming interface circuit connects the discharge circuit, and the inductive current that the control signal received is changed is referred to
Value is inputted to the discharge circuit；
The first input end of the discharge circuit connects the mean value calculation circuit, the second input of the discharge circuit
End connects the dimming interface circuit, and the average value based on the inductive current and the inductive current reference value are compared
Compared with, and exported comparative result as the first output signal to the logic circuit；
The clock signal generators connect the logic circuit, and input to the logic circuit clock of fixed frequency
Signal；
The logic circuit is connected with the output end of the discharge circuit and clock signal generators simultaneously, and according to described
First output signal and the clock signal control the shut-off and conducting of the first switch in the reduction voltage circuit, by controlling
The size of the inductive current of reduction voltage circuit described in the duty cycle adjustment of first switch is stated, the inductive current is equal to the inductance
Current reference value, and then adjust the size of current with the load of the inductance connection.
Alternatively, the reduction voltage circuit also includes diode and the first electric capacity, and the other end of the first switch connects simultaneously
The positive pole of the diode and one end of the inductance are connect, the other end of the inductance connects one end of first electric capacity, institute
State the negative pole connection of the other end and the diode of the first electric capacity.
Alternatively, the detection unit includes first resistor, second resistance and the assists winding with the inductive,
The assists winding is connected one end of the first resistor, another termination of the assists winding with one end of the inductive
Ground, the other end of the first resistor is grounded by the second resistance, and the first resistor is connected with the second resistance
One end connects the mean value calculation circuit, by detecting that one end that the first resistor is connected with the second resistance obtains institute
State inductive current conducting ratio.
Alternatively, the sampling unit includes sampling resistor, and the mean value calculation circuit is adopted by the sampling resistor
Collect the conducting electric current of the first switch as inductive current peak.
Alternatively, the dimming interface circuit control signal is filtered, isolate or transformation of scale after obtain inductance electricity
Reference value is flowed, and the inductive current reference value is inputted to the second input of the discharge circuit.
Alternatively, the dimming interface circuit includes：
Partial pressure unit, inductive current reference voltage is converted into according to internal reference signal by the control signal, wherein, institute
It is stable voltage signal to state internal reference signal；
Low-pass filter unit, is connected to the partial pressure unit, filters out the radio-frequency component of the inductive current reference voltage, and
Filtered inductive current reference voltage is fed back to the second input of the discharge circuit as the inductive current reference value
End.
Alternatively, the partial pressure unit in the dimming interface circuit includes：The coupling electricity of adjustable resistance, 3rd resistor composition
Road, the low-pass filter unit includes the second electric capacity and the 4th resistance, and the internal reference signal is connect by the 3rd resistor
Enter one end of the 4th resistance, the other end of the 4th resistance connects the second input of the discharge circuit, described the
The other end of three resistance is also connected with one end of the adjustable resistance, and one end of the adjustable resistance connects the one of second electric capacity
End, the other end of second electric capacity connects one end of the 4th resistance, the other end of the adjustable resistance and described second
One end of electric capacity is grounded simultaneously.
Alternatively, the adjustable resistance carries out partial pressure to the internal reference signal, and the adjustable resistance is to the inside
The voltage that reference signal progress partial pressure is obtained is the inductive current reference value.
Alternatively, the dimming interface circuit also includes：Signal receiving unit, is configured to receive control signal.
Alternatively, the control signal includes direct current signal or pwm pulse bandwidth modulation signals.
Alternatively, if the first input end of the discharge circuit is negative input end, the second input of the discharge circuit
For the average value and the tune of positive input terminal, the then inductive current that the discharge circuit is inputted based on the mean value calculation circuit
The inductive current reference value of optical interface circuit input is compared, and is exported comparative result as the first output signal to described
Logic circuit includes：
If the inductive current average value is less than the inductive current reference value, described the of discharge circuit output
One output signal increases；
If the inductive current average value is more than the inductive current reference value, described the of discharge circuit output
One output signal reduces.
Alternatively, the logic circuit includes comparator and trigger；
The first input end of the comparator connects the output end of the discharge circuit, receives the discharge circuit input
First output signal, the second input of the comparator, which is received, compares parameter, based on first output signal and the ratio
It is compared, and is inputted comparative result as the second output signal to the trigger compared with parameter；
The second output signal and the clock signal generators that the trigger receives the comparator input simultaneously are defeated
The clock signal entered, and the second output signal inputted according to the comparator controls the shut-off of the first switch so that described
Inductive current peak reduces, and the clock signal control described first of the fixed frequency inputted according to the clock signal generators is opened
The conducting of pass is so that the inductive current peak increases.
Alternatively, it is described to compare what parameter inputted for the signal or the sampling unit of clock signal generators input
Inductive current peak.
Alternatively, if the first input end of the comparator is negative input end, the second input of the comparator is just
Input, then the comparator is based on first output signal and the parameter that compares is compared, if described compare parameter
The signal inputted for the clock signal generators, then it is described to be inputted comparative result as the second output signal to the triggering
Device, including：
If first output signal compares parameter, second output signal of the comparator output more than described
For low level；
If first output signal compares parameter, second output signal of the comparator output less than described
For high level.
Alternatively, the clock signal control for the fixed frequency that the logic circuit is inputted according to the clock signal generators
The first switch conducting, until the voltage for the first output signal that the discharge circuit is inputted is less than the electricity of the clock signal
Control the first switch to turn off during pressure, and then control the ON time of the first switch to control the conducting of the first switch
Dutycycle.
Alternatively, the clock signal generators include oscillator.
Alternatively, the first switch is metal-oxide-semiconductor, and the trigger is rest-set flip-flop, the reset terminal of the rest-set flip-flop
The comparator output terminal is connected, Enable Pin connects the clock signal generators；
When the comparator exports low level, the rest-set flip-flop keeps output high level, the metal-oxide-semiconductor conducting；
When the comparator exports high level, the rest-set flip-flop output resets, and the metal-oxide-semiconductor shut-off passes through control
The ON time of the first switch and then the conducting dutycycle for controlling the first switch.
Alternatively, the inductive current average value is calculated according to below equation,
Wherein, lavg represents inductive current average value；Ipk represents inductive current peak；T represents the week of first switch work
Phase, i.e., the cycle of the clock signal of described clock signal generators output；T1 represents the ON time of metal-oxide-semiconductor；T2 represents inductance
Time of the electric current from peak-fall to zero；Rs represents the size of sampling resistor；Vcs represents sampling resistor Rs voltage.
Alternatively, if the discharge circuit stable state, the first input end of the discharge circuit and the input of the second input
Signal is equal, then has below equation：
Wherein, lavg represents inductive current average value；Vref represents the voltage of internal reference signal；Rext represents adjustable electric
Resistance；R1 represents the first electric value.
Alternatively, if using the inductive current peak as comparing parameter, when the control signal is pwm signal, institute
State pwm signal and control being turned on or off for the termination power, if the termination power is turned on, the inductive current reference voltage
It is zero, if the termination power disconnects, the inductive current reference voltage is the voltage of the internal reference signal；
By adjusting the pwm signal, being turned on or off for the termination power is controlled, so as to adjust the inductive current
The size of reference voltage, and then adjust the size for comparing parameter.
Alternatively, the inductive current reference value is calculated according to below equation：
Inductive current reference value=Vref × (1-D)
Wherein, Vref represents the voltage of internal reference signal, and D represents the dutycycle of pwm signal.
Alternatively, above-mentioned control circuit also includes output driving circuit, is driven according to the output signal of the logic circuit
The first switch is turned on or off.
According to another aspect of the present invention there is provided a kind of lighting device, including：
The chip for the control circuit being integrated with described in claim any one of 1-23；
As the light source device of load, the inductance of the control circuit is connected to；
Wherein, the control circuit receives the control signal of outside input, and is converted to inductive current reference value, by adjusting
The inductive current size of the section control circuit, makes the inductive current be equal to the inductive current reference value, described to adjust
The size of current of light source device.
Alternatively, the control signal of the outside input includes：The control instruction that external equipment is sent, the control instruction
In include target component that the light source device is adjusted.
Alternatively, the external equipment include it is following any one：Switch, intelligent terminal, sensor.
The invention provides one kind control circuit and lighting device, the control circuit provided according to the present invention includes decompression electricity
Road, mean value calculation circuit, dimming interface circuit, discharge circuit, logic circuit and clock signal generators, wherein, amplifier electricity
The inductive current that road can be inputted according to inductive current average value in the reduction voltage circuit got and dimming interface circuit is referred to
Value is compared, and is exported comparative result as the first output signal, logic circuit further according to discharge circuit input it is first defeated
The clock signal for going out signal and clock signal generators input is analyzed, and then controls the pass of the first switch in reduction voltage circuit
Disconnected and conducting, further, by the inductance for controlling reduction voltage circuit described in the duty cycle adjustment of the first switch in reduction voltage circuit
The size of electric current, makes inductive current be equal to inductive current reference value, and then realize the change by changing inductive current reference value
The size of current for the load being connected in regulation reduction voltage circuit with first switch.The control circuit that the present invention is provided is simple and convenient, can
More accurately to get the situation of change of inductive current, and it is wide to be provided with the lighting device dimming scope of the control circuit,
It is with low cost.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, and in order to allow above and other objects of the present invention, feature and advantage can
Become apparent, below especially exemplified by the embodiment of the present invention.
According to the accompanying drawings to the detailed description of the specific embodiment of the invention, those skilled in the art will be brighter
Above-mentioned and other purposes, the advantages and features of the present invention.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 is reduction voltage circuit structural representation according to embodiments of the present invention；
Fig. 2 is switch drive and the oscillogram of inductive current in reduction voltage circuit shown in Fig. 1；
Fig. 3 is control circuit structural representation according to an embodiment of the invention；
Fig. 4 is control circuit structural representation in accordance with another embodiment of the present invention
Fig. 5 is control circuit structural representation in accordance with a preferred embodiment of the present invention；
Fig. 6 is the oscillogram for controlling switch drive, inductive current and auxiliary winding voltage in circuit shown in Fig. 5；
Fig. 7 is the control circuit structural representation according to another preferred embodiment of the present invention.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.
Fig. 1 shows a kind of schematic diagram of reduction voltage circuit, and wherein Q is switching device, and D is fly-wheel diode, and L is inductance,
Export electrochemical capacitor C in parallel with loading LED, inductance L and electrochemical capacitor C, which are mainly, filters out Switching Power Supply high-frequency noise, it is ensured that defeated
Go out for low ripple DC current.
LED is that electric current drives luminescent device, and controlling for reduction voltage circuit is main to control output current as main purpose.Fig. 1
Illustrative circuitry in, switch Q ground connection, on the one hand enable switch Q control chip and control signal realize common ground connection,
So as to reduce circuit cost, and ensure control signal can simply, be reliably connected control chip；But then, it is desirable to
Collection output LED electric current but becomes difficult.Current settling mode is to allow reduction voltage circuit to be operated in critical current pattern, is passed through
The peak value of inductive current is gathered to calculate output LED electric current.
Fig. 2 is the reduction voltage circuit key waveforms for being operated in critical current pattern.Switching drive signal controls Q work, when
When drive signal is high level, switch Q conductings, inductive current linear rise；When drive signal is low level, switch Q disconnects, electricity
Inducing current linear decline；When inductive current drops to zero, control chip turns on switch Q again, starts another cycle.
Inductive current is output to load after electrochemical capacitor C filtering, and its average value is equal to output current.From the ripple of figure two
Shape sees that inductive current is continuous triangle, and average value is equivalent to the half of peak value, controls the peak value of inductive current, Ke Yishi
The change of existing output current, because the electric current that switch Q flows through in conducting is equal with inductive current, inductive current peak can lead to
The conducting electric current for crossing detection switch Q is obtained.
Circuit is controlled the embodiments of the invention provide one kind, Fig. 4, Fig. 5, the control provided according to embodiments of the present invention are provided
Circuit includes：Reduction voltage circuit 10, mean value calculation circuit 20, dimming interface circuit 30, discharge circuit 40, logic circuit 50 with,
Clock signal generators 60, sampling unit 70 and detection unit 80.
One end of first switch Q in reduction voltage circuit 10 and inductance connection, first switch the Q other end and sampling unit 70
Series connection, and be grounded by sampling unit 70.Wherein, first switch is preferably metal-oxide-semiconductor, the embodiment of the present invention hereinafter described in
First switch is introduced by taking metal-oxide-semiconductor as an example, naturally it is also possible to common switching switch or the device with similar functions
Part, the present invention is not limited.
In embodiments of the present invention, sampling unit 70 gathers the inductive current peak of reduction voltage circuit 10 and is input to flat
In mean value computation circuit 20, detection unit 80 is then connected to reduction voltage circuit 10, for detecting the inductive current in reduction voltage circuit 10
Conducting ratio, and inductive current conducting ratio is inputted to mean value calculation circuit 20.Mean value calculation circuit 20 is based on adopting
The inductive current conducting ratio that the inductive current peak and detection unit 80 that sample unit 70 is inputted are inputted calculates inductive current
Average value, and inductive current average value is inputted to discharge circuit 40；Dimming interface circuit 30 connects discharge circuit 40, will receive
To control signal conversion inductive current reference value input to discharge circuit 40；The first input end connection of discharge circuit 40 is flat
Mean value computation circuit 20, the input of discharge circuit 40 second connection dimming interface circuit 30, and based on mean value calculation circuit 20
The inductive current reference value of inductive current average value and dimming interface circuit 30 input of input is compared, and by comparative result
Exported as the first output signal to logic circuit 50.
Logic circuit 50 can be connected with the output end of discharge circuit 40 and clock signal generators 60 simultaneously, and according to fortune
In the first output signal of the input of road 40 and the clock signal control reduction voltage circuit 10 of the input of clock signal generators 60 of discharging
First switch Q shut-off and conducting, by the duty cycle adjustment reduction voltage circuit 10 for controlling first switch Q in reduction voltage circuit 10
The size of inductive current, makes inductive current be equal to inductive current reference value, and then adjust with being connected in reduction voltage circuit 10 with inductance L
Load size of current.
Clock signal generators 60 can export the clock signal of fixed frequency, make control circuit under fixed frequency modes
Work.In embodiments of the present invention, it can be light source device LED with the load of inductance connection, CCFL (Cold are can also be certainly
Cathode Fluorescent Lamp, cathode fluorescent tube) etc. light emitting source or other devices, the present invention do not do
It is specific to limit.
The embodiments of the invention provide a kind of dimming controlling method based on reduction voltage circuit, reduction voltage circuit is operated in fixed frequency
Rate, by changing the dutycycle of the first switch in reduction voltage circuit, to cause inductor current value to be infinitely close to inductive current ginseng
Value is examined, inductive current is equal to inductive current reference value, control circuit provided in an embodiment of the present invention can be obtained more accurately
The situation of change of inductive current is got, and then can reach that the electric current loaded by changing inductive current reference value to can adjust is big
It is small, especially when load is the light source device such as LED, LED dimming scope can be increased.The embodiment of the present invention passes through inductance electricity
Stream peak value and conducting ratio calculate inductive current evaluation of estimate indirectly, compared to directly detection inductive current is simpler, hold
Easily realize, cost also can be lower.
Alternatively, as shown in figure 4, control circuit provided in an embodiment of the present invention can also include output driving circuit 90,
It is connected respectively with the output end and first switch Q of logic circuit 50, and output driving circuit 90 is according to the output of logic circuit 40
Signal driving first switch Q's is turned on or off.
In the control circuit that the preferred embodiment of the present invention is provided, as shown in figure 5, reduction voltage circuit 10 can also include diode
D and the first electric capacity C1, first switch Q one end connect diode D positive pole and inductance L one end simultaneously, and inductance L's is another
The first electric capacity C1 of end connection one end, the negative pole connection of the first electric capacity C1 other end and diode D.
In the preferred embodiment, sampling unit 70 can include sampling resistor Rs, and mean value calculation circuit 20 is by adopting
The first switch Q of sample resistance Rs collections conducting electric current is as inductive current peak, and mean value calculation circuit 20 is based on inductance electricity
Stream peak value and inductive current conducting ratio calculate inductive current average value, and the inductive current average value is inputted to amplifier electricity
The first input end on road 40.
Detection unit 80 can include assists winding Laux (Same Name of Ends is as shown in Figure 5), the first resistor coupled with inductance L
R1 and second resistance R2, assists winding Laux and inductance L one end coupled are connected first resistor R1 one end, assists winding Laux
Other end ground connection, the first resistor R1 other end is grounded by second resistance R2, and first resistor R1 is connected with second resistance R2
One end connection mean value calculation circuit 20, by detecting that one end acquisition inductance that first resistor R1 be connected with second resistance R2 is electric
Flow L conducting ratios.
Wherein, dimming interface circuit 30 control signal can be filtered, isolate or transformation of scale after obtain inductive current ginseng
Examine value, and the inductive current reference value inputted to the second input of discharge circuit 40, it is ensured that inductive current reference value for pair
Answer the low ripple DC voltage of control signal.
Further, as Fig. 4 dimming interface circuits 30 can include：Partial pressure unit 31 and low-pass filter unit 32
Partial pressure unit 31, inductive current reference voltage is converted into according to internal reference signal by control signal, wherein, it is internal
Reference signal is stable voltage signal；Low-pass filter unit 32, is connected to partial pressure unit 31, filters out inductive current reference voltage
Radio-frequency component, and filtered inductive current reference voltage is being fed back into discharge circuit 40 just as inductive current reference value
Input.
The present invention be preferable to carry out it is inner in, such as Fig. 5, partial pressure unit 31 can include：Adjustable resistance Rext, 3rd resistor R3
The termination power of composition, low-pass filter unit 32 can include the second electric capacity C2 and the 4th resistance R4, the electricity of internal reference signal
Vref is pressed to access the 4th resistance R4 one end, the of the 4th resistance R4 other end connection discharge circuit 40 by 3rd resistor R3
Two inputs, the 3rd resistor R3 other end is also connected with adjustable resistance Rext one end, adjustable resistance Rext one end connection the
Two electric capacity C2 one end, the second electric capacity C2 other end connects the 4th resistance R4 one end, the adjustable resistance Rext other end and
Second electric capacity C2 one end is grounded simultaneously.Adjustable resistance Rext carries out partial pressure to the voltage Vref of internal reference signal, by can
The voltage that resistance Rext is obtained to the voltage Vref progress partial pressure of internal reference signal is adjusted as inductive current reference value.
Alternatively, dimming interface control circuit 30 can also include signal receiving unit 33, for receiving from outside input
Control signal.For example, the control signal that brightness adjustment control interface circuit 30 is received can be PWM (Pulse Width
Modulation, pulse width modulation) signal, direct current signal or other signals are can also be certainly, and the present invention is not limited.
Operational analysis can be carried out after inductive current average value and inductive current reference value when discharge circuit 40 is received, is compared
The size of inductive current average value and inductive current reference value, is finally exported comparative result as the first output signal to logic
Circuit 50.Preferably, if the first input end of discharge circuit 40 is negative input end, the second input of discharge circuit 40 is just defeated
Enter end, then the average value for the inductive current that discharge circuit 40 is inputted based on mean value calculation circuit 20 and dimming interface circuit input
Inductive current reference value be compared, and comparative result exported to logic circuit 50 as the first output signal included：
If inductive current average value is less than inductive current reference value, the first output signal that discharge circuit 40 is exported increases
Greatly；
If inductive current average value is more than inductive current reference value, the first output signal that discharge circuit 40 is exported subtracts
It is small.
Logic circuit 50 can include comparator 51 and trigger 52；
The first input end of comparator 51 connects the output end of discharge circuit 40, and receive the input of discharge circuit 40 first is defeated
Go out signal, the second input of comparator 51, which is received, compares parameter, based on above-mentioned first output signal and compare parameter and compared
Compared with, and inputted comparative result as the second output signal to trigger 52；
Trigger 52 simultaneously receive comparator 51 input the second output signal and clock signal generators 60 input when
Clock signal, and the second output signal inputted according to comparator 51 controls first switch Q shut-off so that inductive current peak subtracts
Small, the clock signal of the fixed frequency inputted according to clock signal generators 60 controls first switch Q conducting so that inductance is electric
Stream peak value increases.
Alternatively, it is above-mentioned to compare the inductance that parameter inputs for the signal or sampling unit 70 of the input of clock signal generators 60
Current peak.
Preferably, if the first input end of comparator 51 is negative input end, the second input of comparator 51 is positive input
End, then comparator 51 is based on the first output signal and compares parameter and be compared, if it is defeated for clock signal generators to compare parameter
The signal entered, then input comparative result as the second output signal to trigger 52, including：If the first output signal be more than than
Compared with parameter, then the second output signal that comparator 51 is exported is low level；If the first output signal is less than and compares parameter, compare
The second output signal that device 51 is exported is high level.Wherein, the signal that clock signal generators 60 are inputted can be sawtooth waveforms, than
The voltage of sawtooth waveforms and the voltage of the first output signal that can be inputted compared with device 51 according to clock signal generators 60 are compared.
The clock signal control first for the fixed frequency that logic circuit 50 can be inputted according to clock signal generators 60 is opened
Q conductings are closed, control first is opened when the voltage for the first output signal that discharge circuit 40 is inputted is less than the voltage of clock signal
Q shut-offs are closed, control first switch Q ON time to control first switch Q conducting dutycycle by logic circuit.
Trigger 52 is preferably rest-set flip-flop, and reset terminal (i.e. R ends) the connection output end of comparator 51 of rest-set flip-flop is enabled
(i.e. S ends) connection clock signal generators 60 are held, the output of rest-set flip-flop is directly connected to first switch Q.When comparator 51 is exported
During low level, rest-set flip-flop keeps output high level, first switch Q conductings；When comparator 51 exports high level, rest-set flip-flop
Output resets, first switch Q shut-offs, by controlling first switch Q ON time and then controlling first switch Q conducting duty
Than.
As shown in figure 5, the preferred operational amplifier U1 of discharge circuit 40；U2 represents comparator 51；The preferred RS of trigger 52 is touched
Device is sent out, is represented with U3；The preferred oscillator of clock signal generators 60, is represented with U4.In simple terms, first switch Q conducting by
Oscillator U4 is fixed by rest-set flip-flop U3 and generated, and oscillator U4 output fixed cycle T, circuit is operated in fixed frequency modes.
After switch conduction, because inductance L has energy storage effect, therefore inductive current linear rise, the electric current also flows through first switch Q,
Control circuit is fed back to by sampling resistor Rs；During first switch is turned on, assists winding Laux voltage induced is of the same name
It is negative to hold.Elapsed time t1, first switch Q are turned off, inductive current linear decline, and the voltage induced of assists winding is that Same Name of Ends is
Just.Elapsed time t2, inductive current drops to zero, and assists winding Laux voltage induced declines simultaneously, by detecting the voltage
Decline can obtain the ON time of inductive current.
According to figure five, the average value Iavg of inductive current can be expressed as：
Wherein, lavg represents inductive current average value；Ipk represents inductive current peak；T represents first switch Q work
The cycle of the clock signal of cycle, i.e. clock signal generators output；T1 represents the ON time of metal-oxide-semiconductor；T2 represents inductance electricity
Flow the time from peak-fall to zero；Rs represents the size of sampling resistor；Vcs represents sampling resistor Rs voltage.
The peak value of inductive current can be obtained by sampling resistor Rs voltage Vcs；(t1+t2)/T leads for inductive current
Logical ratio, the ratio can be by detecting that assists winding Laux voltage is obtained.Therefore, by detecting inductive current peak and leading
Logical ratio can calculate inductive current average value.
Inductive current reference value is by passing through voltages of the adjustable resistance Rext and first resistor R1 to internal reference signal
Vref carries out partial pressure and obtained, and Fig. 6 shows the control circuit regulative mode that control signal is direct current signal, by changing adjustable electric
Hinder Rext resistance, thus it is possible to vary partial pressure Vdim size.Partial pressure Vdim is constituted by the 4th resistance R4 and the second electric capacity C2
Low-pass filter unit 32 feeds back to operational amplifier U1 anode, and the 4th resistance R4 and the second electric capacity C2 selection cause partial pressure
Vdim radio-frequency component is filtered out, it is ensured that the voltage for feeding back to operational amplifier U1 anodes is low ripple direct current signal.
When operational amplifier is inputted in stable state, i.e., inductive current average value is equal with inductive current reference value, therefore
There is below equation：
Wherein, lavg represents inductive current average value；Vref represents the voltage of internal reference signal；Rext represents adjustable electric
Resistance；R1 represents the first electric value.
Operational amplifier U1 output is connected to comparator U2 negative terminal, and comparator U2 anode is oscillator U4 generations
Sawtooth waveforms, t1 time span is determined by comparing U1 output and the voltage of sawtooth waveforms.When operational amplifier U1 output
When higher than sawtooth voltage, comparator U2 output low levels, rest-set flip-flop U3 keeps output high level；When operational amplifier U1's
When output is lower than sawtooth voltage, comparator U2 output high level, rest-set flip-flop U3 outputs reset.The frequency and amplitude of sawtooth waveforms
Keep constant, if inductive current average value is lower than reference value, operational amplifier U1 output rises, the corresponding time for improving t1；
If inductive current average value is higher than reference value, operational amplifier U1 output reductions, the corresponding time for reducing t1.Oscillator U4
Its is exported high level to rest-set flip-flop U3 every fixed cycle T output trigger signals, turn on first switch Q.
Another preferred embodiment of the present invention additionally provides a kind of control circuit, as shown in Figure 7.Itself and the control shown in Fig. 5
Circuit theory processed is similar.Different, control signal has been changed to PWM dim signals, increases in dimming interface circuit 30
Second switch S, PWM dim signal control second switch S's turns on and off.When second switch S is turned on, Vdim is low
Level；When second switch S is turned off, Vdim is equal to the voltage Vref of reference signal.4th resistance R4 and the second electric capacity C2
Constitute low pass filter, it is ensured that filter out the radio-frequency component of PWM inputs so that inductive current reference value is equivalent to being averaged for Vdim
Value, it is assumed that the dutycycle of pwm signal is D, then has：
Inductive current reference value=Vref × (1-D)
Inputted in the anode of comparator U2 comparators, no longer using the sawtooth waveforms of oscillator U4 outputs, but multiplexing sampling
Resistance Rs voltage Vcs signals, such U1 is output as control signal, and Vcs size is controlled by comparator U2, that is,
Control the size of inductive current peak.The beginning in each cycle, oscillator U4 output clock signals, the high electricity of rest-set flip-flop U3 outputs
It is flat, first switch Q conductings, when operational amplifier U1 the first output signal ratio sampling resistor Rs exported voltage Vcs is big
Wait, comparator U2 output low levels, rest-set flip-flop U3 keeps high level output；When the first output signal ratio Vcs that U1 is exported is small
When, comparator U2 output high level, rest-set flip-flop U3 outputs reset, first switch Q shut-offs.
The embodiment of the present invention additionally provides a kind of lighting device, including the control circuit being integrated with any of the above-described embodiment
Chip and as load light source device, be connected to control circuit inductance.Wherein, control circuit receives outside input
Control signal, and inductive current reference value is converted to, by the size of the inductive current of adjusting control circuit, make inductive current etc.
In inductive current reference value, to adjust the size of current of light source device.Based on above-mentioned control circuit, it is possible to achieve illumination apparatus
Light be adjusted.
Alternatively, the control signal of outside input can include：Wrapped in the control instruction that external equipment is sent, control instruction
Containing the target component that light source device is adjusted.In actual applications, external equipment can include switch, intelligent terminal, biography
Any one in sensor etc., it is, of course, also possible to which including other equipment, the present invention is not limited.
The embodiment of the present invention can adjust the brightness of light source device to 1% from 100%, and in the prior art can only be by light
The brightness of source device is adjusted to 15% from 100%, it is seen then that the embodiment of the present invention significantly enhances the brightness model of light source device
Enclose, improve the light modulation ratio to light fixture.And then, for the light fixture of the light source device with multiple color, lamp can also be expanded
The model of CIE (Commission Internationale de L'Eclairage, International Commission on Illumination) color coordinates of tool
Enclose, increase the light modulation toning scope of light fixture.
The embodiments of the invention provide one kind control circuit and lighting device, the control electricity provided according to embodiments of the present invention
Road includes reduction voltage circuit, mean value calculation circuit, dimming interface circuit, discharge circuit, logic circuit and clock signal generators,
Wherein, the electricity that discharge circuit can be inputted according to inductive current average value in the reduction voltage circuit got and dimming interface circuit
Inducing current reference value is compared, and is exported comparative result as the first output signal, logic circuit is defeated further according to discharge circuit
The clock signal of the first output signal and the clock signal generators input entered is analyzed, and then the in control reduction voltage circuit
One switch-off and conducting, further, by the duty cycle adjustment reduction voltage circuit for controlling the first switch in reduction voltage circuit
Inductive current size, make inductive current be equal to inductive current reference value, and then realize by changing inductive current reference value
Change regulation reduction voltage circuit in the size of current of load that is connected with first switch.Further, in embodiments of the present invention,
Clock signal generators can also make control circuit be operated in fixed frequency, it is to avoid due to controlling circuit its work in the course of the work
The continuous rising of working frequency, makes the reduction proportional to control signal of the current value of load, and the electric current adjustable range to load is caused
Limitation.The control circuit that the present invention is provided is simple and convenient, and it is wide to be provided with the lighting device dimming scope of the control circuit, cost
It is cheap.
In the specification that this place is provided, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the present invention
Example can be put into practice in the case of these no details.In some instances, known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this description.
Similarly, it will be appreciated that in order to simplify the disclosure and help to understand one or more of each inventive aspect, exist
Above in the description of the exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：It is i.e. required to protect
The application claims of shield features more more than the feature being expressly recited in each claim.More precisely, such as following
Claims reflect as, inventive aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following embodiment are expressly incorporated in the embodiment, wherein each claim is in itself
All as the separate embodiments of the present invention.
Although in addition, it will be appreciated by those of skill in the art that some embodiments described herein include other embodiments
In included some features rather than further feature, but the combination of the feature of be the same as Example does not mean in of the invention
Within the scope of and form different embodiments.For example, in detail in the claims, embodiment claimed it is one of any
Mode it can use in any combination.
So far, although those skilled in the art will appreciate that detailed herein have shown and described multiple showing for the present invention
Example property embodiment, still, still can be direct according to present disclosure without departing from the spirit and scope of the present invention
It is determined that or deriving many other variations or modifications for meeting the principle of the invention.Therefore, the scope of the present invention is understood that and recognized
It is set to and covers other all these variations or modifications.
Claims (25)
1. one kind control circuit, including reduction voltage circuit, the reduction voltage circuit include：First switch, inductance, the inductance with it is described
First switch is connected；
The control circuit also includes：Mean value calculation circuit, dimming interface circuit, discharge circuit, logic circuit, clock signal
Maker, sampling unit and detection unit, wherein,
The sampling unit is connected with the first switch, gathers the inductive current peak of the reduction voltage circuit, and by the electricity
Inducing current peak value is inputted to the mean value calculation circuit；
The detection unit is connected to the reduction voltage circuit, detects the inductive current conducting ratio of the reduction voltage circuit, and by institute
State inductive current conducting ratio and input the mean value calculation circuit；
What the inductive current peak and the detection unit that the mean value calculation circuit is inputted based on the sampling unit were inputted
Inductive current conducting ratio calculates inductive current average value, and the inductive current average value is inputted to amplifier electricity
Road；
The dimming interface circuit connects the discharge circuit, and the inductive current reference value that the control signal received is changed is defeated
Enter to the discharge circuit；
The first input end of the discharge circuit connects the mean value calculation circuit, and the second input of the discharge circuit connects
The dimming interface circuit is connect, and the average value based on the inductive current and the inductive current reference value are compared, and
Exported comparative result as the first output signal to the logic circuit；
The clock signal generators connect the logic circuit, and the clock for inputting fixed frequency to the logic circuit is believed
Number；
The logic circuit is connected with the output end of the discharge circuit and clock signal generators simultaneously, and according to described first
Output signal and the clock signal control the shut-off and conducting of the first switch in the reduction voltage circuit, by controlling described the
The size of the inductive current of reduction voltage circuit, makes the inductive current be equal to the inductive current described in the duty cycle adjustment of one switch
Reference value, and then adjust the size of current with the load of the inductance connection.
2. control circuit according to claim 1, wherein, the reduction voltage circuit also includes diode and the first electric capacity, institute
The other end of first switch is stated while connecting the positive pole of the diode and one end of the inductance, the other end of the inductance connects
Connect one end of first electric capacity, the negative pole connection of the other end and the diode of first electric capacity.
3. control circuit according to claim 1, wherein, the detection unit include first resistor, second resistance and
With the assists winding of the inductive, the assists winding is connected the one of the first resistor with one end of the inductive
End, the other end ground connection of the assists winding, the other end of the first resistor is grounded by the second resistance, and described first
One end that resistance is connected with the second resistance connects the mean value calculation circuit, by detect the first resistor with it is described
One end of second resistance connection obtains the inductive current conducting ratio.
4. control circuit according to claim 1, wherein, the sampling unit includes sampling resistor, the average value meter
Calculate circuit and inductive current peak is used as by the conducting electric current of the sampling resistor collection first switch.
5. control circuit according to claim 1, wherein, the dimming interface circuit filters the control signal, every
From or transformation of scale after obtain inductive current reference value, and the inductive current reference value is inputted to the of the discharge circuit
Two inputs.
6. control circuit according to claim 5, wherein, the dimming interface circuit includes：
Partial pressure unit, inductive current reference voltage is converted into according to internal reference signal by the control signal, wherein, it is described interior
Portion's reference signal is stable voltage signal；
Low-pass filter unit, is connected to the partial pressure unit, filters out the radio-frequency component of the inductive current reference voltage, and will filter
Inductive current reference voltage after ripple feeds back to the second input of the discharge circuit as the inductive current reference value.
7. control circuit according to claim 6, wherein, the partial pressure unit in the dimming interface circuit includes：It is adjustable
The termination power of resistance, 3rd resistor composition, the low-pass filter unit includes the second electric capacity and the 4th resistance, the internal ginseng
One end that signal accesses the 4th resistance by the 3rd resistor is examined, the other end of the 4th resistance connects the amplifier
Second input of circuit, the other end of the 3rd resistor is also connected with one end of the adjustable resistance, the adjustable resistance
One end connects one end of second electric capacity, and the other end of second electric capacity connects one end of the 4th resistance, it is described can
The other end of resistance and one end of second electric capacity is adjusted to be grounded simultaneously.
8. control circuit according to claim 7, wherein, the adjustable resistance is divided the internal reference signal
Pressure, the voltage that the adjustable resistance is obtained to internal reference signal progress partial pressure is the inductive current reference value.
9. control circuit according to claim 6, wherein, the dimming interface circuit also includes：Signal receiving unit, matches somebody with somebody
It is set to reception control signal.
10. control circuit according to claim 6, wherein, the control signal includes direct current signal or pwm pulse width modulated
Signal.
11. control circuit according to claim 1, wherein, if the first input end of the discharge circuit is negative input end,
Second input of the discharge circuit is positive input terminal, then the discharge circuit is inputted based on the mean value calculation circuit
The average value of inductive current and the inductive current reference value of dimming interface circuit input are compared, and comparative result is made
Being exported for the first output signal to the logic circuit includes：
If the inductive current average value is less than the inductive current reference value, described the first of the discharge circuit output is defeated
Go out signal increase；
If the inductive current average value is more than the inductive current reference value, described the first of the discharge circuit output is defeated
Go out signal reduction.
12. control circuit according to claim 1, wherein, the logic circuit includes comparator and trigger；
The first input end of the comparator connects the output end of the discharge circuit, receives the first of the discharge circuit input
Output signal, the second input of the comparator, which is received, compares parameter, based on first output signal and described compares ginseng
Number is compared, and is inputted comparative result as the second output signal to the trigger；
What the second output signal and the clock signal generators that the trigger receives the comparator input simultaneously were inputted
Clock signal, and the second output signal inputted according to the comparator controls the shut-off of the first switch so that the inductance
Current peak reduces, and the clock signal of the fixed frequency inputted according to the clock signal generators controls the first switch
Turn on so that the inductive current peak increases.
13. control circuit according to claim 12, wherein, the parameter that compares inputs for the clock signal generators
Signal or the sampling unit input inductive current peak.
14. control circuit according to claim 12, wherein, if the first input end of the comparator is negative input end,
Second input of the comparator is positive input terminal, then the comparator is based on first output signal and described compares ginseng
Number be compared, if it is described compare parameter be the clock signal generators input signal, it is described using comparative result as
Second output signal is inputted to the trigger, including：
If first output signal compares parameter more than described, second output signal of the comparator output is low
Level；
If first output signal compares parameter less than described, second output signal of the comparator output is height
Level.
15. control circuit according to claim 1, wherein, the logic circuit is defeated according to the clock signal generators
The clock signal of the fixed frequency entered controls the first switch conducting, the first output signal inputted until the discharge circuit
Voltage control the first switch to turn off when being less than the voltage of the clock signal, and then control the conducting of the first switch
The conducting dutycycle of first switch described in time control.
16. control circuit according to claim 15, wherein, the first switch is metal-oxide-semiconductor, and the trigger touches for RS
Device is sent out, the reset terminal of the rest-set flip-flop connects the comparator output terminal, and Enable Pin connects the clock signal generators；
When the comparator exports low level, the rest-set flip-flop keeps output high level, the metal-oxide-semiconductor conducting；
When the comparator exports high level, the rest-set flip-flop output resets, and the metal-oxide-semiconductor shut-off is described by control
The ON time of first switch and then the conducting dutycycle for controlling the first switch.
17. control circuit according to claim 1, wherein, the clock signal generators include oscillator.
18. control circuit according to claim 16, wherein, the inductive current average value is calculated according to below equation,
<mrow>
<mi>I</mi>
<mi>a</mi>
<mi>v</mi>
<mi>g</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mi>I</mi>
<mi>p</mi>
<mi>k</mi>
<mo>&times;</mo>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mn>1</mn>
<mo>+</mo>
<mi>t</mi>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mn>2</mn>
<mi>T</mi>
</mrow>
</mfrac>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<mo>&times;</mo>
<mfrac>
<mrow>
<mi>V</mi>
<mi>c</mi>
<mi>s</mi>
</mrow>
<mrow>
<mi>R</mi>
<mi>s</mi>
</mrow>
</mfrac>
<mo>&times;</mo>
<mfrac>
<mrow>
<mi>t</mi>
<mn>1</mn>
<mo>+</mo>
<mi>t</mi>
<mn>2</mn>
</mrow>
<mi>T</mi>
</mfrac>
</mrow>
Wherein, lavg represents inductive current average value；Ipk represents inductive current peak；T represents the cycle of first switch work,
The cycle of the clock signal of i.e. described clock signal generators output；T1 represents the ON time of metal-oxide-semiconductor；T2 represents inductive current
Time from peak-fall to zero；Rs represents the size of sampling resistor；Vcs represents sampling resistor Rs voltage.
19. control circuit according to claim 18, wherein, if the discharge circuit stable state, the discharge circuit
First input end and the second input input signal are equal, then have below equation：
<mrow>
<mi>I</mi>
<mi>a</mi>
<mi>v</mi>
<mi>g</mi>
<mo>=</mo>
<mi>V</mi>
<mi>r</mi>
<mi>e</mi>
<mi>f</mi>
<mo>&times;</mo>
<mfrac>
<mrow>
<mi>Re</mi>
<mi>x</mi>
<mi>t</mi>
</mrow>
<mrow>
<mi>Re</mi>
<mi>x</mi>
<mi>t</mi>
<mo>+</mo>
<mi>R</mi>
<mn>3</mn>
</mrow>
</mfrac>
</mrow>
Wherein, lavg represents inductive current average value；Vref represents the voltage of internal reference signal；Rext represents adjustable resistance
Value；R1 represents the first electric value.
20. control circuit according to claim 10, wherein,
If using the inductive current peak as parameter is compared, when the control signal is pwm signal, the pwm signal control
Being turned on or off for the termination power is made, if the termination power is turned on, the inductive current reference voltage is zero, if described
Termination power disconnects, and the inductive current reference voltage is the voltage of the internal reference signal；
By adjusting the pwm signal, being turned on or off for the termination power is controlled, so as to adjust the inductive current reference
The size of voltage, and then adjust the size for comparing parameter.
21. control circuit according to claim 20, wherein, the inductive current reference value is calculated according to below equation：
Inductive current reference value=Vref × (1-D)
Wherein, Vref represents the voltage of internal reference signal, and D represents the dutycycle of pwm signal.
22. the control circuit according to claim any one of 1-21, wherein, in addition to output driving circuit, according to described
The output signal of logic circuit drives being turned on or off for the first switch.
23. a kind of lighting device, including：
The chip for the control circuit being integrated with described in claim any one of 1-22；
As the light source device of load, the inductance of the control circuit is connected to；
Wherein, the control circuit receives the control signal of outside input, and is converted to inductive current reference value, by adjusting
The inductive current size of control circuit is stated, the inductive current is equal to the inductive current reference value, to adjust the light source
The size of current of device.
24. lighting device according to claim 23, wherein, the control signal of the outside input includes：External equipment
The target component that the light source device is adjusted is included in the control instruction of transmission, the control instruction.
25. lighting device according to claim 24, wherein, the external equipment include it is following any one：Switch, intelligence
Can terminal, sensor.
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| CN113973411A (en) * | 2020-07-22 | 2022-01-25 | 斯坦雷电气株式会社 | Lighting control device and lighting device |
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