CN108260254A - Switch continuous LED drive circuit, method and driving power - Google Patents
Switch continuous LED drive circuit, method and driving power Download PDFInfo
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- CN108260254A CN108260254A CN201810165780.3A CN201810165780A CN108260254A CN 108260254 A CN108260254 A CN 108260254A CN 201810165780 A CN201810165780 A CN 201810165780A CN 108260254 A CN108260254 A CN 108260254A
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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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Abstract
The present invention is suitable for driving circuit technical field, provides a kind of continuous LED drive circuit of switch, method and driving power.The circuit includes：Control module, for starting after obtaining the voltage of AC power；Referrer module, for when the voltage of the sampling end of control module is equal with the voltage of referrer module, sending reset signal to control module, control module is stopped according to the reset signal；Voltage-controlled module, for after control module is stopped, the voltage of voltage-controlled module to increase；Comparison module, in voltage of the voltage of voltage-controlled module equal to comparison module, sending enabling signal to control module, control module is again started up according to the enabling signal.The present invention, which realizes, switchs continuous mode activated, saves the output capacitance in LED drive power, improves the LED power service life, reduces LED power cost, and simplify peripheral applications circuit design.
Description
Technical field
The invention belongs to driving circuit technical field more particularly to continuous LED (the Light Emitting of switch
Diode, light emitting diode) driving circuit, method and driving power.
Background technology
Traditional LED drive power using switch critical conduction mode, the advantage is that control method is simple, but switch
Ripple is larger, and the peak value of switch is almost two times of LED load electric current, in order to reduce the current ripples of LED load, driving circuit
Need using output capacitance, and require output capacitance and LED load parallel connection to meet the luminous efficiency of LED, but it is such the shortcomings that
It is to increase system cost and circuit complexity, and the service life of capacitance service life limitation LED power.
Invention content
In view of this, continuous LED drive circuit, method and driving power are switched an embodiment of the present invention provides a kind of,
To solve the service life of output capacitance limitation LED drive power in the prior art, and increase driving circuit complexity, make circuit cost
The problem of high.
First aspect of the embodiment of the present invention provides a kind of continuous LED drive circuit of switch, including：Control module, ginseng
Examine module, voltage-controlled module and comparison module；
The control module, input terminal are suitable for connecting with AC power, and sampling end and the input terminal of the referrer module connect
It connects, the first control terminal is connect with the signal output end of the referrer module, and the second control terminal and the signal of the comparison module are defeated
Outlet connects；The control module starts after the voltage for obtaining AC power；
The referrer module is equal with the voltage of the referrer module for working as the voltage of the sampling end of the control module
When, reset signal is sent to the control module, the control module is stopped according to the reset signal；
The voltage-controlled module, signal input part are connect with the sampling end of the control module, output terminal mould compared with described
The voltage input end connection of block；After the control module is stopped, the voltage raising of the voltage-controlled module；
The comparison module, during for being equal to the voltage of the comparison module in the voltage of the voltage-controlled module, to described
Control module sends enabling signal, and the control module is again started up according to the enabling signal.
Optionally, the control module includes power field effect transistor, sampling resistor and multiple positional number rest-set flip-flop；
The drain electrode of the power field effect transistor is connect with the AC power, the grid of the power field effect transistor
Pole is connect with the output terminal of the rest-set flip-flop, the first end of the source electrode of the power field effect transistor and the sampling resistor
Connection；
The reset terminal of the rest-set flip-flop is connect with the first control terminal of the control module, and the rest-set flip-flop puts number
End is connect with the second control terminal of the control module；
Sampling end of the first end of the sampling resistor also with the control module is connect, the second end of the sampling resistor
Ground connection.
Optionally, the referrer module includes peak point current comparator and peak reference current source；
The positive input of the peak point current comparator is connect with the sampling end of the control module, the peak point current
The reverse input end of comparator is connect with the anode of the peak reference current source, the signal output of the peak point current comparator
End is connect with the first control terminal of the control module；
The cathode ground connection of the peak reference current source.
Optionally, the voltage-controlled module includes voltage-controlled current source, slope capacitance and first switching element；
The signal input part of the voltage-controlled current source is connect with the signal input part of the voltage-controlled module, the voltage controlled current
The output terminal in source is connect with the first end of the slope capacitance；
First end of the first end of the slope capacitance also with the first switching element is connect, and the of the slope capacitance
Two ends are grounded, and the second end of the second end of the slope capacitance also with the first switching element is connect.
Optionally, the comparison module includes oscillation comparator and oscillation reference voltage source；
The positive input of the oscillation comparator is connect with the voltage input end of the comparison module, and the oscillation is compared
The reverse input end of device is connect with the anode of the oscillation reference voltage source, the output terminal of the oscillation comparator and the comparison
The signal output end connection of module；
The cathode ground connection of the oscillation reference voltage source.
Optionally, the circuit further includes filtering compensation module；
The input terminal of the filtering compensation module is connect with the sampling end of the control module, the filtering compensation module
Signal output end is connect with the signal input part of the voltage-controlled module；
The filtering compensation module is used to after control module startup obtain the voltage of the control module, and to obtaining
The voltage taken is filtered and compensates, and control signal is sent to the voltage-controlled module；
The voltage-controlled module is additionally operable to according to the control signal output voltage.
Optionally, the filtering compensation module includes second switch element, filter resistance, filter capacitor, compensation resistance, mends
Repay capacitance, operational amplifier and average reference current source；
The first end of the second switch element is connect with the input terminal of the filtering compensation module, the second switch member
The second end of part is connect with the first end of the filter resistance；
The second end of the filter resistance is connect with the anode of the filter capacitor, the second end of the filter resistance also with
The first end connection of the compensation resistance；
The cathode of the filter capacitor is connect with the cathode of the mean baseline current source；
The anode of the mean baseline current source is connect with the positive input of the operational amplifier；
The reverse input end of the operational amplifier is connect with the second end of the compensation resistance, the operational amplifier
Anode of the reverse input end also with the compensating electric capacity is connect, the output terminal of the operational amplifier and the filtering compensation module
Signal output end connection, the cathode of the output terminal of the operational amplifier also with the compensating electric capacity connect；
Wherein, after the control module starts, the first switching element and the second switch element are closed；
After the control module is stopped, the first switching element and the second switch element disconnect.
Second aspect of the embodiment of the present invention provides a kind of continuous LED driving methods of switch, suitable for including controlling mould
Block, referrer module, voltage-controlled module and comparison module the continuous LED drive circuit of switch, the method includes：
The control module starts after obtaining the voltage of AC power；
When the voltage of the sampling end of the control module is equal with the voltage of the referrer module, the referrer module to
The control module sends reset signal, and the control module is stopped according to the reset signal；
The voltage raising of the voltage-controlled module, when the voltage of the voltage-controlled module is equal to the voltage of the comparison module,
The comparison module sends enabling signal to the control module, and the control module is again started up according to the enabling signal.
Optionally, before the voltage of the sampling end of the control module is equal with the voltage of the referrer module also
Including：
The voltage of the control module is obtained, the voltage of acquisition is filtered and compensated, and is sent out to the voltage-controlled module
Send control signal；
The voltage-controlled module is according to the control signal output voltage.
The third aspect of the embodiment of the present invention provides a kind of driving power, includes any one of above-described embodiment first aspect
The continuous LED drive circuit of the switch, further includes：Rectifier bridge, LED load, inductance and fly-wheel diode；
The input terminal of the rectifier bridge is connect with AC power, the positive output end of the rectifier bridge and the LED load
One end connects, and the cathode of the positive output end of the rectifier bridge also with the fly-wheel diode is connect；
The other end of the LED load is connect with the first end of the inductance；
The second end connection of the inductance and the input terminal of the control module of the continuous LED drive circuit of switch connect
It connects；
The anode of the fly-wheel diode is connect with the second end of the inductance.
Existing advantageous effect is the embodiment of the present invention compared with prior art：Control module obtains the voltage of AC power
After start；When the voltage of the sampling end of control module is equal with the voltage of referrer module, referrer module is sent to control module
Reset signal, control module are stopped according to the reset signal；After control module is stopped, the voltage of voltage-controlled module
Raising；When the voltage of voltage-controlled module is equal to the voltage of comparison module, comparison module sends enabling signal, control to control module
Module is again started up according to the enabling signal, is realized the continuous mode activated of switch, is saved the output in LED drive power
Capacitance improves the LED power service life, reduces LED power cost, and simplify peripheral applications circuit design.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the structure diagram of the continuous LED drive circuit of switch that the embodiment of the present invention one provides；
Fig. 2 is the circuit diagram of the continuous LED drive circuit of switch that the embodiment of the present invention one provides；
Fig. 3 is the realization flow chart of the continuous LED driving methods of switch provided by Embodiment 2 of the present invention；
Fig. 4 is the sampling operation sequence diagram of the continuous LED driving methods of switch provided by Embodiment 2 of the present invention；
Fig. 5 is the oscillatory work sequence diagram of the continuous LED driving methods of switch provided by Embodiment 2 of the present invention；
Fig. 6 is a kind of circuit diagram for driving power that the embodiment of the present invention three provides.
Specific embodiment
In being described below, in order to illustrate rather than in order to limit, it is proposed that such as tool of particular system structure, technology etc
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specifically
The present invention can also be realized in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
Road and the detailed description of method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.
Embodiment one
Referring to Fig. 1, a kind of continuous LED drive circuit of switch provided in this embodiment, including control module 100, reference
Module 200, voltage-controlled module 300 and comparison module 400.
The input terminal of control module 100 is suitable for connecting with AC power, the sampling end and referrer module of control module 100
200 input terminal connection, the first control terminal of control module 100 are connect with the signal output end of referrer module 200, control module
100 the second control terminal is connect with the signal output end of comparison module 400；Control module 100 is used to obtain the electricity of AC power
Start after pressure.
Referrer module 200 is used for when the voltage of the sampling end of control module 100 is equal with the voltage of referrer module 200,
Reset signal is sent to control module 100；Control module 100 is stopped according to the reset signal.
The signal input part of voltage-controlled module 300 is connect with the sampling end of control module 100, the output terminal of voltage-controlled module 300
It is connect with the voltage input end of comparison module 400；After control module 100 is stopped, the voltage raising of voltage-controlled module 300.
Comparison module 400 is used for when the voltage of voltage-controlled module 300 is equal to the voltage of comparison module 400, to control module
100 send enabling signal, and control module 100 is again started up according to the enabling signal.
In the above-mentioned continuous LED drive circuit of switch, control module 100 starts after obtaining the voltage of AC power；Work as control
When the voltage of the sampling end of molding block 100 is equal with the voltage of referrer module 200, referrer module 200 is sent to control module 100
Reset signal, control module 100 are stopped according to the reset signal；After control module 100 is stopped, voltage-controlled module
300 voltage raising；When voltage-controlled module 300 voltage be equal to comparison module 400 voltage when, comparison module 400 to control mould
Block 100 sends enabling signal, and control module 100 is again started up according to the enabling signal, realizes and saves in LED drive power
Output capacitance, improve the LED power service life, reduce LED power cost, and simplify peripheral applications circuit designs.
Further, referring to Fig. 2, as a kind of specific embodiment, control module 100 includes power field effect transistor
M1, sampling resistor Rcs and RS (Reset Set, multiple positional number) trigger.
The drain electrode of power field effect transistor M1 is connect with AC power, the grid of power field effect transistor M1 with it is described
The output terminal Q connections of rest-set flip-flop, the source electrode of power field effect transistor M1 are connect with the first end of sampling resistor Rcs.
The reset terminal R of the rest-set flip-flop is connect with the first control terminal of control module 100, and the rest-set flip-flop puts number
End S is connect with the second control terminal of control module 100.
Sampling end of the first end of sampling resistor Rcs also with control module 100 is connect, the second termination of sampling resistor Rcs
Ground.
Power field effect transistor M1 can be MOS (Metal Oxide Semiconductor, metal in the present embodiment
Oxide semiconductor) pipe or realize other components of correlation function, such as switching tube.
Further, as a kind of specific embodiment, referrer module 200 includes peak point current comparator A1 and peak value base
Quasi- current source U1.
The positive input of peak point current comparator A1 is connect with the sampling end of control module 100, peak point current comparator
The reverse input end of A1 is connect with the anode of peak reference current source U1, the signal output end of peak point current comparator A1 and control
The first control terminal connection of module 100.
The cathode ground connection of peak reference current source U1.
Further, as a specific embodiment, voltage-controlled module 300 include voltage-controlled current source U2, slope capacitance C4 and
First switching element K1.
The signal input part of voltage-controlled current source U2 is connect with the signal input part of voltage-controlled module 300, voltage-controlled current source U2's
Output terminal is connect with the first end of slope capacitance C4.
First end of the first end of slope capacitance C4 also with first switching element K1 is connect, the second termination of slope capacitance C4
Ground, the second end of the second end of slope capacitance C4 also with first switching element K1 are connect.
Further, as a specific embodiment, comparison module 400 includes oscillation comparator A2 and oscillation reference voltage
Source U3.
The positive input of oscillation comparator A2 is connect with the voltage input end of comparison module 400, oscillation comparator A2's
Reverse input end is connect with the anode of oscillation reference voltage source U3, the letter of the output terminal and comparison module 400 of oscillation comparator A2
The connection of number output terminal.
The cathode ground connection of oscillation reference voltage source U3.
Further, as a specific embodiment, the continuous LED drive circuit of switch further includes filtering compensation mould
Block 500.
The input terminal of filtering compensation module 500 is connect with the sampling end of control module 100, the letter of filtering compensation module 500
Number output terminal is connect with the signal input part of voltage-controlled module 300.
Filtering compensation module 500 is used to after the startup of control module 100 obtain the voltage of control module 100, and to obtaining
Voltage be filtered and compensate, to voltage-controlled module 300 send control signal.
Voltage-controlled module 300 is additionally operable to according to the control signal output voltage.
Optionally, filtering compensation module 500 includes second switch element K2, filter resistance R1, filter capacitor C2, compensation electricity
Hinder R2, compensating electric capacity C3, operational amplifier A 3 and average reference current source U4.
The first end of second switch element K2 is connect with the input terminal of filtering compensation module 500, second switch element K2's
Second end is connect with the first end of filter resistance R1.
The second end of filter resistance R1 is connect with the anode of filter capacitor C2, and the second end of filter resistance R1 is also electric with compensation
Hinder the first end connection of R2.
The cathode of filter capacitor C2 is connect with the cathode of mean baseline current source U4.
The anode of mean baseline current source U4 is connect with the positive input of operational amplifier A 3.
The reverse input end of operational amplifier A 3 with compensate resistance R2 second end connect, operational amplifier A 3 it is reversed defeated
Enter anode of the end also with compensating electric capacity C3 to connect, the output terminal of operational amplifier A 3 is exported with the signal of filtering compensation module 500
End connection, the cathode of the output terminal of operational amplifier A 3 also with compensating electric capacity C3 are connect.
Wherein, after control module 100 starts, first switching element K1 and second switch element K2 are closed.
After control module 100 is stopped, first switching element K1 and second switch element K2 are disconnected.
The LED drive circuit course of work is specifically described below according to mode of the embodiment of the present invention：
In each switch periods, control module 100 starts after obtaining the voltage of AC power；When control module 100
When the voltage of sampling end is equal with the voltage of referrer module 200, referrer module 200 sends reset signal, control to control module 100
Molding block 100 is stopped according to the reset signal；After control module 100 is stopped, the voltage liter of voltage-controlled module 300
It is high；When the voltage of voltage-controlled module 300 is equal to the voltage of comparison module 400, comparison module 400 is opened to the transmission of control module 100
Dynamic signal, control module 100 are again started up according to the enabling signal.
Specifically, referring to Fig. 2 and Fig. 6, when power field effect transistor M1 is connected, the output terminal Q of rest-set flip-flop is sent out
Trigger signal is closed first switching element K1 and second switch element K2, and the voltage on inductance L1 is Vbus-Vled, wherein
Vled is the pressure drop of LED load.When power field effect transistor M1 is connected, the voltage linear of inductance L1 rises, power field effect
Answer the voltage of transistor M1 and the voltage also linear rise of sampling resistor Rcs.
Meanwhile voltage filtered resistance R1 and filter capacitor the C2 filtering of sampling resistor Rcs, it is produced on filter capacitor C2
Raw DC voltage.Wherein, which reflects average electricity of the sampling resistor Rcs when power field effect transistor M1 is connected
Pressure value.
DC voltage on filter capacitor C2 is input to the inverting input of operational amplifier A 3 by compensating resistance R2, fortune
Amplifier A3 is calculated to put the electric current of the electric current of the inverting input of operational amplifier A 3 and mean baseline current source U4 progress error
Greatly, and in the output terminal of operational amplifier A 3 a control signal is generated.Compensating electric capacity C3 and compensation resistance R2 forms one and rectifys
Positive compensation circuit carries out correction compensation to the DC voltage for being input to operational amplifier A 3.
Electric current in the control signal control voltage-controlled current source U2 of operational amplifier 204 exports, in voltage-controlled current source U2
Electric current is slope capacitance C4 chargings, but when power field effect transistor M1 is connected, and the first switching element K1 is closed state, slope
Voltage on capacitance C4 is maintained zero.
When the voltage of the voltage on sampling resistor Rcs and peak reference current source U1 is equal, peak point current comparator A1
Output terminal send reset signal to the reset terminal R of rest-set flip-flop, rest-set flip-flop resets, and driving power field effect transistor M 1 cuts
Only.
When power field effect transistor M1 ends, the first switching element K1 is disconnected, at this time the voltage on slope capacitance C4
Linear rise, when the voltage on the capacitance C4 of slope is equal to the voltage of oscillation reference voltage source U3, the output of oscillation comparator A2
It holds to the set end S of rest-set flip-flop and sends enabling signal, the output terminal Q output high level signals of rest-set flip-flop make power field effect
Transistor M1 is connected again, i.e., control module 100 is again started up according to the enabling signal, completes the work of a switch periods
Process.
In above-described embodiment, control module 100 starts after obtaining the voltage of AC power；When the sampling of control module 100
When the voltage at end is equal with the voltage of referrer module 200, referrer module 200 sends reset signal to control module 100, controls mould
Block 100 is stopped according to the reset signal；After control module 100 is stopped, the voltage raising of voltage-controlled module 300；
When the voltage of voltage-controlled module 300 is equal to the voltage of comparison module 400, comparison module 400 is sent to control module 100 starts letter
Number, control module 100 is again started up according to the enabling signal, realizes the continuous mode activated of switch, saves LED driving electricity
Output capacitance in source improves the LED power service life, reduces LED power cost, and simplify peripheral applications circuit design.
Embodiment two
Corresponding to the continuous LED drive circuit of switch in embodiment one, it is continuous to present embodiments provide a kind of switch
LED driving methods.Referring specifically to Fig. 3, the realization flow diagram of one embodiment of continuous LED driving methods is switched, in detail
It states as follows：
Step S301, control module 100 start after obtaining the voltage of AC power.
Illustratively, referring to Fig. 2 or Fig. 6, after control module 100 obtains the voltage of AC power, power field effect crystal
Pipe M1 is connected, and the output terminal Q of rest-set flip-flop sends out trigger signal, and first switching element K1 and second switch element K2 are closed.
The voltage linear of inductance L1 rises at this time, the electricity of voltage and sampling resistor Rcs in power field effect transistor M1
Also linear rise is pressed, is the sample man of the continuous LED driving methods of switch provided by Embodiment 2 of the present invention referring specifically to Fig. 4
Make sequence diagram, it can be seen that the voltage linear of sampling resistor Rcs rises when power field effect transistor M1 is connected.
Step S302, when the voltage of the sampling end of control module 100 is equal with the voltage of referrer module 200, with reference to mould
Block 200 sends reset signal to control module 100, and control module 100 is stopped according to the reset signal.
Illustratively, referring to Fig. 2 and Fig. 6, when the voltage phase of the voltage on sampling resistor Rcs and peak reference current source U1
Whens waiting, the output terminal of peak point current comparator A1 sends reset signal to the reset terminal R of rest-set flip-flop, and rest-set flip-flop resets, and drives
Dynamic power field effect transistor M1 cut-offs, i.e., control module 100 is stopped according to the reset signal.
Step S303, the voltage raising of voltage-controlled module 300, when the voltage of voltage-controlled module 300 is equal to the electricity of comparison module 400
During pressure, comparison module 400 sends enabling signal to control module 100, and control module 100 opens again according to the enabling signal
It is dynamic.
Illustratively, referring to Fig. 2 and Fig. 6, when power field effect transistor M1 ends, the first switching element K1 is disconnected,
The voltage linear on slope capacitance C4 rises at this time.Specifically, referring to Fig. 5, to switch the oscillation work of continuous LED driving methods
Make sequence diagram, it is known that, when power field effect transistor M1 ends, the voltage linear on the capacitance C4 of slope rises.
When the voltage on the capacitance C4 of slope is equal to the voltage of oscillation reference voltage source U3, the output terminal of oscillation comparator A2
Enabling signal is sent to the set end S of rest-set flip-flop, the output terminal Q output high level signals of rest-set flip-flop make power field effect brilliant
Body pipe M1 is connected again, i.e., control module 100 is again started up according to the enabling signal, completes the worked of switch periods
Journey.
Optionally, it is also wrapped before the voltage of the sampling end of the control module 100 is equal with the voltage of referrer module 200
It includes：
The voltage of control module 100 is obtained, the voltage of acquisition is filtered and compensated, and is sent to voltage-controlled module 300
Control signal.
Referring specifically to Fig. 2 or Fig. 6, voltage filtered resistance R1 and filter capacitor the C2 filtering on sampling resistor Rcs,
DC voltage is generated on filter capacitor C2.DC voltage on filter capacitor C2 is input to operational amplifier by compensating resistance R2
The inverting input of A3, operational amplifier A 3 is by the electric current of the inverting input of operational amplifier A 3 and mean baseline current source U4
Electric current carry out error amplification, and operational amplifier A 3 output terminal generate one control signal.Wherein, compensating electric capacity C3 and
It compensates resistance R2 and forms a correction compensation circuit, correction compensation is carried out to the DC voltage for being input to operational amplifier A 3, is rectified
The bandwidth of positive compensation circuit can be designed to 5-10 times of switch periods.
Voltage-controlled module 300 is according to the control signal output voltage.
Specifically, the electric current in the control signal control voltage-controlled current source U2 of operational amplifier 204, voltage-controlled current source U2 exist
It charges after receiving control signal for slope capacitance C4, but during power field effect transistor M1 conductings, the first switching element K1 is
Closed state, the voltage on the capacitance C4 of slope are maintained zero；When power field effect transistor M1 ends, the first switching element K1 is
Off-state, the voltage on the capacitance C4 of slope rise, and the rate of voltage rise on the capacitance C4 of slope controls signal related with described,
The control signal is bigger, and voltage-controlled current source U2 is faster to slope capacitance C4 chargings, when the voltage of slope capacitance C4 is equal to oscillation
During the voltage of reference voltage source U3, power field effect transistor M1 conductings.Therefore, filtering compensation module 500 controls voltage-controlled module
300 electric current output size so as to control the time being stopped of control module 100, can both control switch OFF
Time.
In the above-mentioned continuous LED driving methods of switch, control module 100 starts after obtaining the voltage of AC power；Work as control
When the voltage of the sampling end of molding block 100 is equal with the voltage of referrer module 200, referrer module 200 is sent to control module 100
Reset signal, control module 100 are stopped according to the reset signal；After control module 100 is stopped, voltage-controlled module
300 voltage raising；When voltage-controlled module 300 voltage be equal to comparison module 400 voltage when, comparison module 400 to control mould
Block 100 sends enabling signal, and control module 100 is again started up according to the enabling signal, realizes the continuous pattern of switch and drives
It is dynamic, the output capacitance in LED drive power is saved, improves the LED power service life, reduces LED power cost, and simplify peripheral applications
Circuit design.
It should be understood that the size of the serial number of each step is not meant to the priority of execution sequence, each process in above-described embodiment
Execution sequence should determine that the implementation process without coping with the embodiment of the present invention forms any limit with its function and internal logic
It is fixed.
Embodiment three
A kind of driving power is present embodiments provided, any switch including being provided in above-described embodiment one connects
Continuous LED drive circuit, it may have the advantageous effect of the continuous LED drive circuit of switch described in any of the above-described kind.
Optionally, the driving power further includes：Rectifier bridge D1, LED load, inductance L1 and sustained diode 2.
It is a kind of circuit diagram of driving power provided in this embodiment referring specifically to Fig. 6.The input terminal of rectifier bridge D1
It is connect with AC power, the positive output end of rectifier bridge D1 is connect with one end of the LED load, and the positive output end of rectifier bridge D1 is also
It is connect with the cathode of sustained diode 2.
The ac voltage rectifier that rectifier bridge D1 inputs AC power is DC voltage Vbus.
The other end of the LED load is connect with the first end of inductance L1.
The input terminal of control module of the second end connection of inductance L1 with switching continuous LED drive circuit is connect, i.e., electric
The second end connection of sense L1 is connect with the drain electrode of power field effect transistor M1.
The anode of sustained diode 2 is connect with the second end of inductance L1.
Optionally, the driving power further includes bus capacitor C1.The first end and rectifier bridge D1 of bus capacitor C1 is just
Output terminal connects, and the second end of bus capacitor C1 is connect with the negative output terminal of rectifier bridge D1, i.e. bus capacitor C1 is parallel to rectification
Between the positive-negative output end of bridge D1.
Bus capacitor C1 is used to store the energy of AC power input and maintains Vbus voltages basicly stable.
The driving power of the present embodiment, by rectifier bridge D1 by AC rectification be direct current, and pass through bus capacitor will
Direct current keeps stablizing；Rectifier bridge by DC supply input to LED load and inductance L1, since the electric current of inductance L1 is continuous and
The sampling of driving circuit, voltage compensation, then the shut-in time of power field effect transistor M1 is controlled, a closed loop is formed,
LED load electric current is precisely controlled, realizes the continuous mode activated of switch, saves the output electricity in LED drive power
Hold, improve the LED power service life, reduce LED power cost, and simplify peripheral applications circuit design.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each work(
Can unit, module division progress for example, in practical application, can be as needed and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device are divided into different functional units or module, more than completion
The all or part of function of description.Each functional unit, module in embodiment can be integrated in a processing unit, also may be used
To be that each unit is individually physically present, can also two or more units integrate in a unit, it is above-mentioned integrated
The form that hardware had both may be used in unit is realized, can also be realized in the form of SFU software functional unit.In addition, each function list
Member, the specific name of module are not limited to the protection domain of the application also only to facilitate mutually distinguish.Above system
The specific work process of middle unit, module can refer to the corresponding process in preceding method embodiment, and details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may realize that each exemplary lists described with reference to the embodiments described herein
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is performed with hardware or software mode, specific application and design constraint depending on technical solution.Professional technician
Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed device/terminal device and method, it can be with
It realizes by another way.For example, device described above/terminal device embodiment is only schematical, for example, institute
The division of module or unit is stated, only a kind of division of logic function can have other dividing mode in actual implementation, such as
Multiple units or component may be combined or can be integrated into another system or some features can be ignored or does not perform.Separately
A bit, shown or discussed mutual coupling or direct-coupling or communication connection can be by some interfaces, device
Or the INDIRECT COUPLING of unit or communication connection, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical unit, you can be located at a place or can also be distributed to multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
That each unit is individually physically present, can also two or more units integrate in a unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although with reference to aforementioned reality
Example is applied the present invention is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each
Technical solution recorded in embodiment modifies or carries out equivalent replacement to which part technical characteristic；And these are changed
Or replace, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution should all
Including within protection scope of the present invention.
Claims (10)
1. a kind of continuous Light-emitting diode LED driving circuit of switch, which is characterized in that including：Control module, referrer module,
Voltage-controlled module and comparison module；
The control module, input terminal are suitable for connecting with AC power, and sampling end is connect with the input terminal of the referrer module, the
One control terminal is connect with the signal output end of the referrer module, and the second control terminal and the signal output end of the comparison module connect
It connects；The control module starts after the voltage for obtaining AC power；
The referrer module, for when the voltage of the sampling end of the control module is equal with the voltage of the referrer module,
Reset signal is sent to the control module, the control module is stopped according to the reset signal；
The voltage-controlled module, signal input part are connect with the sampling end of the control module, output terminal and the comparison module
Voltage input end connects；After the control module is stopped, the voltage raising of the voltage-controlled module；
The comparison module, for the voltage of the voltage-controlled module be equal to the comparison module voltage when, to the control
Module sends enabling signal, and the control module is again started up according to the enabling signal.
2. continuous LED drive circuit is switched as described in claim 1, which is characterized in that the control module includes power
Field-effect transistor, sampling resistor and multiple positional number rest-set flip-flop；
The drain electrode of the power field effect transistor is connect with the AC power, the grid of the power field effect transistor with
The output terminal connection of the rest-set flip-flop, the source electrode of the power field effect transistor and the first end of the sampling resistor connect
It connects；
The reset terminal of the rest-set flip-flop is connect with the first control terminal of the control module, the rest-set flip-flop put several ends with
The second control terminal connection of the control module；
Sampling end of the first end of the sampling resistor also with the control module is connect, the second termination of the sampling resistor
Ground.
3. continuous LED drive circuit is switched as described in claim 1, which is characterized in that the referrer module includes peak value
Current comparator and peak reference current source；
The positive input of the peak point current comparator is connect with the sampling end of the control module, and the peak point current compares
The reverse input end of device is connect with the anode of the peak reference current source, the signal output end of the peak point current comparator with
The first control terminal connection of the control module；
The cathode ground connection of the peak reference current source.
4. continuous LED drive circuit is switched as described in claim 1, which is characterized in that the voltage-controlled module includes voltage-controlled
Current source, slope capacitance and first switching element；
The signal input part of the voltage-controlled current source is connect with the signal input part of the voltage-controlled module, the voltage-controlled current source
Output terminal is connect with the first end of the slope capacitance；
First end of the first end of the slope capacitance also with the first switching element is connect, the second end of the slope capacitance
Ground connection, the second end of the second end of the slope capacitance also with the first switching element are connect.
5. continuous LED drive circuit is switched as described in claim 1, which is characterized in that the comparison module includes oscillation
Comparator and oscillation reference voltage source；
The positive input of the oscillation comparator is connect with the voltage input end of the comparison module, the oscillation comparator
Reverse input end is connect with the anode of the oscillation reference voltage source, the output terminal and the comparison module of the oscillation comparator
Signal output end connection；
The cathode ground connection of the oscillation reference voltage source.
6. continuous LED drive circuit is switched as claimed in claim 4, which is characterized in that the circuit further includes filtering and mends
Repay module；
The input terminal of the filtering compensation module is connect with the sampling end of the control module, the signal of the filtering compensation module
Output terminal is connect with the signal input part of the voltage-controlled module；
The filtering compensation module is used to after control module startup obtain the voltage of the control module, and to acquisition
Voltage is filtered and compensates, and control signal is sent to the voltage-controlled module；
The voltage-controlled module is additionally operable to according to the control signal output voltage.
7. continuous LED drive circuit is switched as claimed in claim 6, which is characterized in that the filtering compensation module includes
Second switch element, filter resistance, filter capacitor, compensation resistance, compensating electric capacity, operational amplifier and average reference current source；
The first end of the second switch element is connect with the input terminal of the filtering compensation module, the second switch element
Second end is connect with the first end of the filter resistance；
The second end of the filter resistance is connect with the anode of the filter capacitor, the second end of the filter resistance also with it is described
Compensate the first end connection of resistance；
The cathode of the filter capacitor is connect with the cathode of the mean baseline current source；
The anode of the mean baseline current source is connect with the positive input of the operational amplifier；
The reverse input end of the operational amplifier with it is described compensation resistance second end connect, the operational amplifier it is reversed
Anode of the input terminal also with the compensating electric capacity is connect, the letter of the output terminal of the operational amplifier and the filtering compensation module
The connection of number output terminal, the cathode of the output terminal of the operational amplifier also with the compensating electric capacity are connect；
Wherein, after the control module starts, the first switching element and the second switch element are closed；
After the control module is stopped, the first switching element and the second switch element disconnect.
8. a kind of continuous LED driving methods of switch, suitable for control module, referrer module, voltage-controlled module and comparison module
LED drive circuit, which is characterized in that including：
The control module starts after obtaining the voltage of AC power；
When the voltage of the sampling end of the control module is equal with the voltage of the referrer module, the referrer module is to described
Control module sends reset signal, and the control module is stopped according to the reset signal；
The voltage raising of the voltage-controlled module, it is described when the voltage of the voltage-controlled module is equal to the voltage of the comparison module
Comparison module sends enabling signal to the control module, and the control module is again started up according to the enabling signal.
9. continuous LED driving methods are switched as claimed in claim 8, which is characterized in that the control module
It is further included before the voltage of sampling end is equal with the voltage of the referrer module：
The voltage of the control module is obtained, the voltage of acquisition is filtered and compensated, and control is sent to the voltage-controlled module
Signal processed；
The voltage-controlled module is according to the control signal output voltage.
10. a kind of driving power, any one of them including such as claim 1 to 7 switchs continuous LED drive circuit,
It is characterized in that, further includes：Rectifier bridge, LED load, inductance and fly-wheel diode；
The input terminal of the rectifier bridge is connect with AC power, the positive output end of the rectifier bridge and one end of the LED load
Connection, the cathode of the positive output end of the rectifier bridge also with the fly-wheel diode are connect；
The other end of the LED load is connect with the first end of the inductance；
The second end connection of the inductance is connect with the input terminal of the control module of the continuous LED drive circuit of switch；
The anode of the fly-wheel diode is connect with the second end of the inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810165780.3A CN108260254B (en) | 2018-02-28 | 2018-02-28 | LED driving circuit with continuous switch, method and driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810165780.3A CN108260254B (en) | 2018-02-28 | 2018-02-28 | LED driving circuit with continuous switch, method and driving power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108260254A true CN108260254A (en) | 2018-07-06 |
| CN108260254B CN108260254B (en) | 2020-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810165780.3A Active CN108260254B (en) | 2018-02-28 | 2018-02-28 | LED driving circuit with continuous switch, method and driving power supply |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152956A (en) * | 2013-03-28 | 2013-06-12 | 杭州士兰微电子股份有限公司 | LED (Light Emitting Diode) driving circuit and constant-current control circuit thereof |
| CN203884059U (en) * | 2014-06-13 | 2014-10-15 | 成都芯源系统有限公司 | LED driving device and controller thereof |
| CN104333936A (en) * | 2014-08-04 | 2015-02-04 | 深圳天源中芯半导体有限公司 | Closed-loop control circuit for LED constant current drive circuit |
| CN104883798A (en) * | 2015-06-11 | 2015-09-02 | 矽力杰半导体技术(杭州)有限公司 | Led linear constant current drive circuit |
-
2018
- 2018-02-28 CN CN201810165780.3A patent/CN108260254B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152956A (en) * | 2013-03-28 | 2013-06-12 | 杭州士兰微电子股份有限公司 | LED (Light Emitting Diode) driving circuit and constant-current control circuit thereof |
| CN203884059U (en) * | 2014-06-13 | 2014-10-15 | 成都芯源系统有限公司 | LED driving device and controller thereof |
| CN104333936A (en) * | 2014-08-04 | 2015-02-04 | 深圳天源中芯半导体有限公司 | Closed-loop control circuit for LED constant current drive circuit |
| CN104883798A (en) * | 2015-06-11 | 2015-09-02 | 矽力杰半导体技术(杭州)有限公司 | Led linear constant current drive circuit |
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|---|---|
| CN108260254B (en) | 2020-01-07 |
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