CN107396495A - A kind of constant current driving device and light fixture - Google Patents
A kind of constant current driving device and light fixture Download PDFInfo
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- CN107396495A CN107396495A CN201710666621.7A CN201710666621A CN107396495A CN 107396495 A CN107396495 A CN 107396495A CN 201710666621 A CN201710666621 A CN 201710666621A CN 107396495 A CN107396495 A CN 107396495A
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
Abstract
The present invention is applied to driving power technical field, there is provided a kind of constant current driving device and light fixture.The constant current driving device includes：Rectification module, for the alternating current of external power source to be converted into direct current；Signal processing module, it is connected with the output end of the rectification module, is further adapted for being connected with light emitting module, for receives the direct current power information of the rectification module and the conducting voltage information of light emitting module and sending current modifying signal to constant flow module；The output end of the rectification module is further adapted for being connected with the light emitting module；Constant flow module, it is connected with the output end of the signal processing module, is further adapted for being connected with the light emitting module, for adjusts the electric current of the light emitting module according to the adjustment signal.Above-mentioned constant current driving device and light fixture are realized under different line voltage inputs, and power input power keeps constant.
Description
Technical field
The invention belongs to driving power technical field, more particularly to a kind of constant current driving device and light fixture.
Background technology
In traditional linear constant current drive device, line voltage carries out rectification by rectifier bridge, and the voltage after rectification is full
After foot is higher than LED (light emitting diode, light emitting diode) lamp string voltage, constant current driving device exports constant electricity
Stream, because LED string and constant-current source are series relationship in circuit, the electric current by constant current driving device is LED string
Constant current.Then the input power of constant current driving device can be understood as in the lamp string course of work, and input voltage is averaged
The input current amplitude of the product of magnitude of voltage and input current, wherein constant current driving device is equal to the output electricity of constant current driving device
Stream peak value, the i.e. peak point current of LED string and lamp string voltage are fixed value.Because constant current driving device is in different input voltages
Under, the average value of input voltage is variable quantity, and the input power of LED string is different.The light fixture of this constant current driving device is anti-
The problem of mirroring is that overall input power can not be consistent under different input voltages, when input line voltage is low, system
Input power is low, and light fixture is dark；When input line voltage is high, system input power is high, and light fixture is brighter.
The content of the invention
In view of this, it is permanent in the prior art to solve the embodiments of the invention provide a kind of constant current driving device and light fixture
The problem of stream drive device input power can not be consistent under different input voltages.
The first aspect of the embodiment of the present invention provides a kind of constant current driving device, including：
Rectification module, for the alternating current of external power source to be converted into direct current；
Signal processing module, it is connected with the output end of the rectification module, is further adapted for being connected with light emitting module, for receiving
The direct current power information of the rectification module and the conducting voltage information of light emitting module simultaneously send current modifying signal to constant flow module；
The output end of the rectification module is further adapted for being connected with the light emitting module；
Constant flow module, it is connected with the output end of the signal processing module, is further adapted for being connected with the light emitting module, is used for
The electric current of the light emitting module is adjusted according to the adjustment signal.
Optionally, the rectification module includes：
Rectifier bridge DB1, input are connected with AC network L lines, and output end is connected with the output end of the rectification module, is connect
Ground terminal is grounded.
Optionally, the rectification module also includes：
Protective resistance FR1, one end connection AC network L lines, the other end connect the input of the rectifier bridge DB1；It is described
Rectifier bridge DB1 inputs are connected by the protective resistance FR1 with the AC network L lines.
Optionally, the signal processing module is integrated circuit.
Optionally, the current modifying signal includes electric current PWM (Pulse Width Modulation, pulse width tune
System) pulse duty cycle adjusts signal and current amplitude adjusts signal；The constant flow module has first input end and the second input
End, the first input end receive the current amplitude adjustment signal, and second input receives the electric current PWM pulsewidths and accounted for
Sky is than adjustment signal；
The constant flow module includes：
Range-adjusting unit, input are connected with the first input end of the constant flow module, and output end is suitable to and the hair
Optical module is electrically connected, and the electric current of the signal adjustment light emitting module is adjusted according to the current amplitude；
Dutycycle adjustment unit, input are connected with the second input of the constant flow module, output end be suitable to it is described
Light emitting module is electrically connected, and the electric current of the signal adjustment light emitting module is adjusted according to the electric current PWM pulse duty cycles.
Optionally, the dutycycle adjustment unit includes：Power tube Q2, the input of grid and the dutycycle adjustment unit
End connection, drain electrode are suitable to electrically connect with the light emitting module, source ground.
Optionally, the electric current of the luminescence component includes current amplitude and current duty cycle；
The range-adjusting unit adjusts signal according to the current amplitude and adjusts the current amplitude；
The dutycycle adjustment unit adjusts signal according to the electric current PWM pulse duty cycles and adjusts the electric current duty
Than.
Optionally, the range-adjusting unit adjusts the signal adjustment current amplitude according to the current amplitude and specifically wrapped
Include：
When the voltage magnitude of AC network becomes big, the current amplitude adjustment signal diminishes, and the current amplitude diminishes；
When the voltage magnitude of AC network becomes small, the current amplitude adjustment signal becomes big, and the current amplitude becomes big.
Optionally, the constant flow module also includes：Operational amplifier, switching tube Q1 and sampling resistor R1；
The operational amplifier positive input terminal is connected with the range-adjusting unit output end, negative input end and the sampling
Resistance R1 one end is connected, and output end is connected with the common port of the drain electrode of the grid and the power tube Q2 of the switching tube Q1；
Switching tube Q1 drain electrode is connected with the light emitting module, source electrode and the operational amplifier negative input end and described
The common port connection of sampling resistor R1 one end；The sampling resistor R1 other ends ground connection.
The second aspect of the embodiment of the present invention provides a kind of light fixture, including light emitting module and as in the embodiments above
Any one described in constant current driving device.
Existing beneficial effect is the embodiment of the present invention compared with prior art：By the present invention constant current driving device and
The conducting voltage information of signal processing module analysis light emitting module and the direct current power information of the rectification module of light fixture, to described
Constant flow module sends current modifying signal；Constant flow module adjusts the electric current of the light emitting module transmission according to current modifying signal,
Realize under different line voltage inputs, power input power keeps constant.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
In the required accompanying drawing used be briefly described, it should be apparent that, 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
Accompanying drawing obtains other accompanying drawings.
Fig. 1 is a kind of structural representation of constant current driving device provided in an embodiment of the present invention；
Fig. 2 is the structural representation of another constant current driving device provided in an embodiment of the present invention；
Fig. 3 is a kind of electrical block diagram of constant current driving device provided in an embodiment of the present invention；
Fig. 4 is a kind of implementation process schematic diagram of constant current driving device shown in Fig. 3；
Fig. 5 is that a kind of constant current driving device provided in an embodiment of the present invention adjusts output current width under different input voltages
The current waveform figure of value；
Fig. 6 adjusts output current for a kind of constant current driving device provided in an embodiment of the present invention under different input voltages and accounted for
The current waveform figure of empty ratio；
Fig. 7 is that a kind of constant current driving device provided in an embodiment of the present invention adjusts output electricity simultaneously under different input voltages
Flow the current waveform figure of amplitude and current duty cycle.
Embodiment
In describing 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, thoroughly to understand the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention can also be realized in the other embodiments of details.In other situations, omit to well-known system, device, electricity
Road and the detailed description of method, in case unnecessary details hinders 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 constant current driving device provided in an embodiment of the present invention, including rectification module 100, signal transacting mould
Block 300 and constant flow module 400.
Rectification module 100, for the alternating current of external power source to be converted into direct current.
Signal processing module 300, it is connected with the rectification module 100, is further adapted for being connected with light emitting module 200, for connecing
Receive the direct current power information of the rectification module 100 and the conducting voltage information of light emitting module 200 and send electricity to constant flow module 400
Stream adjustment signal；The rectification module 100 is further adapted for being connected with the light emitting module 200.
Constant flow module 400, it is connected with the signal processing module 300, is further adapted for being connected with the light emitting module 200, is used
In the electric current that the light emitting module 200 is adjusted according to the adjustment signal.
In the constant current driving device, signal processing module 300 is by analyzing the conducting voltage information of light emitting module 200 and whole
The direct current power information of flow module 100, current modifying signal is sent to constant flow module 400, the current modifying signal includes electric current
PWM pulse duty cycles adjust signal and current amplitude adjustment signal.Constant flow module 400 adjusts luminous mould according to current modifying signal
The electric current of block 200, the electric current of light emitting module 200 include current amplitude and current duty cycle, i.e., constant flow module 400 is according to the electricity
Flow range-adjusting signal and adjust the current amplitude, adjusting signal according to the electric current PWM pulse duty cycles adjusts the electric current
Dutycycle.Realize under different line voltage inputs, constant current driving device input power keeps constant.
Further, Fig. 2 and Fig. 3 is referred to, as a kind of embodiment, constant current driving device includes rectification module
100th, light emitting module 200, signal processing module 300, constant flow module 400.
Rectification module 100, for the alternating current of external power source to be converted into direct current, while retain the ac power waveform
Amplitude information.Rectification module 100 specifically includes rectifier bridge DB1.Rectifier bridge DB1 input is connected with AC network L lines, rectification
Bridge DB1 output end is connected with the output end of rectification module 100, rectifier bridge DB1 earth terminal ground connection.In the present embodiment, rectification
Bridge DB1 includes multiple diodes.Preferably, diode number is 4 in rectifier bridge DB1, and arrangement mode is around arrangement, two poles
The negative pole of pipe 1 is connected with the positive pole of diode 2, is rectifier bridge DB1 input；The negative pole of diode 2 and the negative pole of diode 3
Connection, it is rectifier bridge DB1 output end；The positive pole of diode 3 is connected with the negative pole of diode 4, is rectifier bridge DB1 ground connection
End；The positive pole of diode 4 is connected with the positive pole of diode 1, is rectifier bridge DB1 input.
Optionally, rectification module 100 also includes protective resistance FR1.Protective resistance FR1, one end connection AC network L lines,
The other end connects the input of the rectifier bridge DB1, whole circuit is impacted during for preventing AC network input AC electric current,
Damage circuit, i.e. overvoltage, overcurrent protection effect.
Optionally, the light emitting module 200 is connected with signal processing module 300, and conducting voltage information is sent into signal
Processing module 300.Light emitting module 200 is further adapted for being connected with constant flow module 400, and current information is inputed to perseverance by light emitting module 200
Flow module 400.Wherein, light emitting module 200 can be various luminescent devices, such as can be connected in series the LED being also connected in parallel
Lamp string etc., but the present embodiment is not limited the device of light emitting module 200.
Optionally, signal processing module 300 is integrated circuit, for detecting the direct current power information and light emitting module
200 conducting voltage information, current modifying signal adaptively is sent to constant flow module 400, wherein, the current modifying signal bag
Include electric current PWM pulse duty cycles adjustment signal and current amplitude adjustment signal.It will be understood by those skilled in the art that PWM pulsewidths account for
Sky accounts for the ratio of whole cycle than high level in an exactly pulse period, and it is related to the whole input current of light emitting module 200
Size.
Specifically, signal processing module 300 can include detecting signal unit 301 and control unit 302.
Detecting signal unit 301, for receiving the direct current power information handled through over commutation of the transmission of rectification module 100
The conducting voltage information sent with light emitting module 200.
Control unit 302, for sending current modifying signal to constant flow module 400, the current modifying signal includes electricity
Flow PWM pulse duty cycles adjustment signal and current amplitude adjustment signal.Constant flow module 400 has first input end and the second input
End, the first input end receive the current amplitude adjustment signal, and second input receives the electric current PWM pulsewidths and accounted for
Sky is than adjustment signal.
In a particular application, signal processing module 300 can be CPU (Central Processing
Unit, CPU), it can also be other general processors, application specific integrated circuit (Application Specific Integrated
Circuit, ASIC), discrete gate or transistor logic, discrete hardware components etc..
Optionally, constant flow module 400 is connected with light emitting module 200, is received the electric current of light emitting module 200, is further adapted for and believes
Number processing module 300 connects, and receives the electric current PWM pulse duty cycles adjustment signal and current amplitude adjustment signal, and
The electric current sent according to adjustment signal adjustment light emitting module 200.The electric current of light emitting module 200 includes current amplitude and electricity
Flow dutycycle.
Further, constant flow module 400 can include range-adjusting unit 401 and dutycycle adjustment unit 402.
Range-adjusting unit 401, input are connected with the first input end of constant flow module 400, and output end is suitable to lighting
Module 200 is connected, and the electric current of signal adjustment light emitting module 200 is adjusted according to the current amplitude.
Dutycycle adjustment unit 402, input are connected with the second input of the constant flow module 400, and output end is suitable to
It is connected with the light emitting module 200, adjusting signal according to the electric current PWM pulse duty cycles adjusts the light emitting module 200
Electric current.
Optionally, the range-adjusting unit 401 can include：Range-adjusting circuit, input and range-adjusting unit
401 input connection.The range-adjusting circuit is integrated circuit, can be application specific integrated circuit (Application
Specific Integrated Circuit, ASIC).The dutycycle adjustment unit 402 includes power tube Q2.Power tube Q2
Grid be connected with the input of dutycycle adjustment unit 402, power tube Q2 drain electrode is connected with the light emitting module, power tube
Q2 source ground.
Constant flow module 400 also includes operational amplifier, switching tube Q1 and sampling resistor R1.The positive input terminal of operational amplifier
It is connected with range-adjusting circuit output end, the output end of operational amplifier connects with power tube Q2 drain electrodes, operational amplifier
Negative input end be connected with switching tube Q1 source electrode and the common port of sampling resistor R1 one end.Switching tube Q1 drain electrode is suitable to and institute
State light emitting module 200 to connect, switching tube Q1 grids and the output end of the operational amplifier and power tube Q2 drain electrodes are public
End connection.Sampling resistor R1, one end are connected with the source electrode of the switching tube Q1 and the negative input end of the operational amplifier respectively,
The other end is grounded；The source electrode of the switching tube Q1 and the negative input end of the operational amplifier are connect by the sampling resistor R1
Ground.
Specifically, in the present embodiment constant flow module 400 can include a range-adjusting circuit, an operational amplifier,
Switching tube Q1 and power tube Q2, sampling resistor R1.The output current range-adjusting signal of signal processing module 300 enters constant flow module
400 first input end, i.e., into the range-adjusting circuit input end, current amplitude described in the range-adjusting the regulation of electrical circuit
Signal is adjusted, the current amplitude adjustment signal changes and changed according to the ac power waveform of AC network, that is, works as AC network
Voltage magnitude when becoming big, current amplitude adjustment signal diminishes；When the voltage magnitude of AC network becomes small, the electric current
Range-adjusting signal becomes big.Current amplitude adjustment signal is being inputted the operational amplifier just by the range-adjusting circuit
Input, the output end connecting valve pipe Q1 of operational amplifier grid, the output of switching tube Q1 drain electrode sending and receiving optical module 200
End, the current amplitude of luminescence component 200 is adjusted, to meet constant input power；The negative input end of operational amplifier
Connecting valve pipe Q1 source electrode, sampling resistor R1 one end connecting valve pipe Q1 source electrode, the current sampling resistor R1 other end
Welding system.
The output current PWM pulse duty cycles of signal processing module 300 adjustment signal enters the second input of constant flow module 400
End, i.e. power tube Q2 grid, power tube Q2 adjust signal adjustment light emitting module 200 according to the electric current PWM pulse duty cycles
Current duty cycle, make the current duty cycle with ac power waveform change and change, to meet constant input power.I.e.
When the voltage of AC network becomes big, the electric current PWM pulse duty cycles adjustment signal becomes big, and the current duty cycle diminishes；
When the voltage of AC network becomes small, the electric current PWM pulse duty cycles adjustment signal diminishes, and the current duty cycle becomes big；
Power tube Q2 drain electrode connects field switch pipe Q1 grid, power tube Q2 source ground.
It should be appreciated that the invention is not restricted to individual system application, when multiple systems are combined application.The embodiment of the present invention
Module or unit in system can be combined, divided and deleted according to actual needs.
Further, in one embodiment, the course of work of the constant current driving device is：
The alternating current that AC network inputs is converted to direct current by S401, rectification module 100, and by the direct current electricity output
To light emitting module 200, the direct current power information is sent into the signal processing module 300.
Alternating current passes through protective resistance FR1, and protective resistance enters row buffering to alternating current, prevents due to the excessive damage of alternating current
Circuit, alternating current enter rectifier bridge DB1 inputs through protective resistance FR1, and the alternating current is converted to direct current by rectifier bridge DB1
Electricity, and the light emitting module 200 is exported, the direct current power information is sent into the signal processing module 300.The rectification module
100 retain the waveforms amplitude of the convert alternating current when alternating current is converted into direct current, the direct current information includes described
The waveforms amplitude of convert alternating current.
Conducting voltage information is sent the signal processing module 300, the luminous mould by S402, the light emitting module 200
Electric current is sent the constant flow module 400 by block 200.
The conducting voltage information is the information of voltage of the input power of the light emitting module 200, and the electric current is to flow through
The electric current of the direct current of light emitting module 200.The light emitting module 200 can be any luminescent device, it is preferred that the present embodiment lights
Module 200 provides a kind of LED string, and the present embodiment is not limited the LED number and arrangement mode of the LED string.
S403, the signal processing module 300 is according to the direct current power information and the conducting voltage of the light emitting module 200
Information, current modifying signal is sent to the constant flow module 400.
The current modifying signal includes electric current PWM pulse duty cycles adjustment signal and current amplitude adjustment signal.
S404, the constant flow module 400 adjusts the electric current of light emitting module 200 according to the current modifying signal, and will adjust
Electric current after whole sends the light emitting module 200.
Current amplitude adjustment signal is sent the constant flow module 400 first and inputted by the signal processing module 300
End, electric current PWM pulse duty cycles adjustment signal is sent into the input of constant flow module 400 second.Further, the constant current
Module 400 includes range-adjusting unit 401, for adjusting the electric current of the signal adjustment light emitting module 200 according to current amplitude；
Dutycycle adjustment unit 402, for adjusting the electric current of the light emitting module 200 according to the current modifying signal.It is described luminous
The electric current of module 200 includes the current amplitude and the current duty cycle.
Specifically, the range-adjusting unit 401 adjusts signal according to the current amplitude adjusts the current amplitude；Institute
State dutycycle adjustment unit 402 and the signal adjustment current duty cycle is adjusted according to the electric current PWM pulse duty cycles.
Wherein, the dutycycle adjustment unit 401 adjusts signal according to the current amplitude and adjusts the current amplitude tool
Body is：
For constant current driving device under the different voltage of outside power input, alternating current is converted to direct current by rectification module 100
Electricity, and the amplitude of exchange Electrical change waveform is preserved, signal processing module 300 gathers the direct current power information of rectification module 100.When straight
When stream electricity is higher than 200 demand voltage of light emitting module, signal processing module 300 exports a current amplitude adjustment by internal arithmetic
Signal Vref, the current amplitude adjustment signal Vref is an analog quantity.Vref is worth the change for following alternating current by a certain percentage
And change, i.e., when the voltage magnitude of AC network becomes big, the current amplitude adjustment signal diminishes, and the current amplitude becomes
It is small；When the voltage magnitude of AC network becomes small, the current amplitude adjustment signal becomes big, and the current amplitude becomes big.
For example, constant current driving device is under different voltage U1, U2, U3 input, and U1<U2<U3；Current amplitude adjusts signal
Vref value is followed successively by Vref1, Vref2, Vref3, wherein Vref1>Vref2>Vref3.Current amplitude adjustment signal Vref enters
The range-adjusting unit 401 of constant flow module 400, range-adjusting unit 401 adjust signal Vref adjustment by current amplitude and lighted
The current amplitude that module 200 inputs, makes current amplitude follow the change of direct current power information and change, ensure that the ripple of output current
Shape is consistent substantially in shape with the grid voltage waveform after rectification.As shown in figure 5, when the voltage magnitude of AC network becomes
When big, the current amplitude adjustment signal diminishes, and the current amplitude diminishes；When the voltage magnitude of AC network becomes small, institute
State current amplitude adjustment signal and become big, the current amplitude becomes big.
Specifically, in an ac grid voltage work period, the peak value of input ac voltage is fixed value, works as alternating current
Pressure rises to the conducting voltage of light emitting module 200 from 0V, and constant current driving device starts output current, and line voltage continuously rises to
During maximum, output current also synchronously rises to peak point current, now constant current driving device operating current waveform such as Fig. 5
Show.The input power system of constant current driving device can be understood as in the course of work of light emitting module 200, the average electricity of input voltage
The product of pressure value and input current, i.e. Pin=UAverage voltage*IAverage current.Current waveform as shown in Figure 5 is carried out on t1 to t2 time
Integration, can obtain average voltageAnd average current
That is the input power of constant current driving device is
It is a kind of electrical block diagram of constant current driving device provided in an embodiment of the present invention referring to Fig. 3, constant current drives
The output current of device is also the input current of constant current driving device, the electric current of input current position of Different Slope in waveform
It is worth for IA, the line voltage of constant current driving device input is Vin, the ω in formula is the π of Fixed constant 2.Under working condition, constant current
Drive device is under different input voltages, the I of input currentAFor different value.By the appropriate setting of constant flow module 400,
Under different input voltages, Vin*IAFor a constant, now device is under different input voltages, input power PINFor steady state value.
The dutycycle adjustment unit 402 adjusts the signal adjustment electric current according to the electric current PWM pulse duty cycles and accounted for
Empty ratio is specially：
For constant current driving device under the different voltage of outside power input, alternating current is converted to direct current by rectification module 100
Electricity, and the amplitude of exchange Electrical change waveform is preserved, signal processing module 300 gathers the direct current power information of rectification module 100.Signal
Processing module 300 exports electric current PWM pulse duty cycles adjustment signal all the way, and this electric current PWM pulse duty cycles adjustment signal follows
The change of input direct-current power information and change, now device operating current waveform such as Fig. 6 shows.Signal processing module 300 exports electricity
PWM pulse duty cycles adjustment signal is flowed to adjust signal to constant flow module 400, this electric current PWM pulse duty cycles and adjust into dutycycle
The switching tube Q2 of whole unit 402 grid, the i.e. input of constant flow module 400 second, dutycycle waveform as shown in Figure 6, work as exchange
When the voltage of power network is larger, the electric current PWM pulse duty cycles adjustment signal becomes big, and the current duty cycle D diminishes；Work as exchange
When the voltage of power network is smaller, the electric current PWM pulse duty cycles adjustment signal is smaller, and the current duty cycle D becomes big.For example,
Under three different input voltage range U1, U2, U3, the duty of the operating current of the light emitting module 200 of constant current driving device
D1, D2, D3, wherein U1 are followed successively by than size<U2<U3, while D1>D2>D3.
Specifically, the input power of constant current driving device can be understood as in the course of work of light emitting module 200, input
The average voltage level of voltage and the product of input current, i.e. Pin=UAverage voltage*IAverage current.To current waveform as shown in Figure 6, to being arrived in t1
Integrated on t2 time, can obtain the input average voltage of constant current driving device
The output current of constant current driving device is also the input current of constant current driving device, and the average current of constant current driving device input is
The peak point current of constant current driving device work and the dutycycle D products of constant current driving device input current, i.e. IAverage current=Imax* D,
Then the input power of constant current driving device is calculated as followsWherein, ImaxFor
Fixed value, constant current driving device input ac voltage Vin, ω is that Fixed constant 2 π, D are variate-value.Pass through the electricity of constant flow module 400
Road suitably adjusts, and can make Vin* D is a constant, and now constant current driving device is under different input voltages, input power PinFor
Steady state value.
Further, when constant current driving device in the operating condition, the change of the current amplitude of the light emitting module 200 and electricity
Stream change in duty cycle follows the change of input ac voltage amplitude and synchronously changed.It is for example, defeated in three different voltages
Entering under scope U1, U2, U3, the size of current at a certain moment is followed successively by I1, I2, I3 under each operating voltage of constant current driving device,
The dutycycle size of the operating current of light emitting module 200 is followed successively by D1, D2, D3.Wherein U1<U2<U3, while D1>D2>D3, I1>I2
>I3, now constant current driving device operating current waveform such as Fig. 7 show.Constant current driving device input power is Pin=UAverage voltage*
IAverage current, to being integrated on t1 to t2 time, can obtain the input average voltage of constant current driving deviceConstant current driving device input average current be
That is the input power of constant current driving device isDriven and filled by constant current
The input power P putINUnderstand, pass through appropriate adjustment, Vin*IA* D is a constant, and now constant current driving device is different defeated
Enter under voltage, input power PINFor steady state value.
The invention provides a kind of constant current driving device, compared with prior art, at the signal of the constant current driving device
Module 300 is managed by analyzing the conducting voltage information of light emitting module 200 and the direct current power information of the rectification module 100, to institute
State constant flow module 400 and send current modifying signal；Constant flow module 400 adjusts the light emitting module 200 according to current modifying signal
The electric current of transmission, realize under different line voltage inputs, power input power keeps constant.
Embodiment two
Present embodiments provide a kind of light fixture, including light emitting module and any constant current driving dress as described in embodiment one
Put, and there is beneficial effect possessed by above-mentioned constant current driving device.
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 unit is individually physically present, can also two or more units it is integrated in a unit, it is above-mentioned integrated
Unit can both be realized in the form of hardware, 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.Said system
The specific work process of middle unit, module, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and is not described in detail or remembers in some embodiment
The part of load, it may refer to the associated description of other embodiments.
Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein
Member and algorithm steps, it can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
Performed with hardware or software mode, application-specific and design constraint depending on technical scheme.Professional and technical personnel
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, can be real by another way
It is existing.For example, device embodiment described above is only schematical, for example, the division of the module or unit, is only
A kind of division of logic function, can there is an other dividing mode when actually realizing, for example, multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be by some interfaces, the INDIRECT COUPLING or communication of device or unit connect
Connect, can be electrical, mechanical or other forms.
The unit illustrated as separating component can be or may not be physically separate, show as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, 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 foregoing reality
Example is applied the present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each
Technical scheme described in embodiment is modified, or carries out equivalent substitution to which part technical characteristic；And these are changed
Or replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme, all should
Within protection scope of the present invention.
Claims (10)
- A kind of 1. constant current driving device, it is characterised in that including：Rectification module, for the alternating current of external power source to be converted into direct current；Signal processing module, it is connected with the output end of the rectification module, is further adapted for being connected with light emitting module, it is described for receiving The direct current power information of rectification module and the conducting voltage information of light emitting module simultaneously send current modifying signal to constant flow module；It is described The output end of rectification module is further adapted for being connected with the light emitting module；Constant flow module, it is connected with the output end of the signal processing module, is further adapted for being connected with the light emitting module, for basis The adjustment signal adjusts the electric current of the light emitting module.
- 2. constant current driving device as claimed in claim 1, it is characterised in that the rectification module includes：Rectifier bridge DB1, input are connected with AC network L lines, and output end is connected with the output end of the rectification module, earth terminal Ground connection.
- 3. constant current driving device as claimed in claim 2, it is characterised in that the rectification module also includes：Protective resistance FR1, one end connection AC network L lines, the other end connect the input of the rectifier bridge DB1；The rectification Bridge DB1 inputs are connected by the protective resistance FR1 with the AC network L lines.
- 4. constant current driving device as claimed in claim 1, it is characterised in that the signal processing module is integrated circuit.
- 5. constant current driving device as claimed in claim 1, it is characterised in that the current modifying signal includes electric current PWM arteries and veins Wide dutycycle adjustment signal and current amplitude adjustment signal；The constant flow module has first input end and the second input, institute State first input end and receive the current amplitude adjustment signal, second input receives the electric current PWM pulse duty cycles Adjust signal；The constant flow module includes：Range-adjusting unit, input are connected with the first input end of the constant flow module, and output end is suitable to and the luminous mould Block is electrically connected, and the electric current of the signal adjustment light emitting module is adjusted according to the current amplitude；Dutycycle adjustment unit, input are connected with the second input of the constant flow module, and output end is suitable to light with described Module is electrically connected, and the electric current of the signal adjustment light emitting module is adjusted according to the electric current PWM pulse duty cycles.
- 6. constant current driving device as claimed in claim 5, it is characterised in that the dutycycle adjustment unit includes：Power tube Q2, grid are connected with the input of the dutycycle adjustment unit, and drain electrode is suitable to electrically connect with the light emitting module, and source electrode connects Ground.
- 7. constant current driving device as claimed in claim 5, it is characterised in that the electric current of the luminescence component includes current amplitude And current duty cycle；The range-adjusting unit adjusts signal according to the current amplitude and adjusts the current amplitude；The dutycycle adjustment unit adjusts signal according to the electric current PWM pulse duty cycles and adjusts the current duty cycle.
- 8. constant current driving device as claimed in claim 7, it is characterised in that the range-adjusting unit is according to the electric current width Value adjustment signal adjusts the current amplitude and specifically included：When the voltage magnitude of AC network becomes big, the current amplitude adjustment signal diminishes, and the current amplitude diminishes；When the voltage magnitude of AC network becomes small, the current amplitude adjustment signal becomes big, and the current amplitude becomes big.
- 9. constant current driving device as claimed in claim 6, it is characterised in that the constant flow module also includes：Operational amplifier, Switching tube Q1 and sampling resistor R1；The operational amplifier positive input terminal is connected with the range-adjusting unit output end, negative input end and the sampling resistor R1 one end is connected, and output end is connected with the common port of the drain electrode of the grid and the power tube Q2 of the switching tube Q1；The switching tube Q1 drain electrodes are connected with the light emitting module, source electrode and the operational amplifier negative input end and the sampling The common port connection of resistance R1 one end；The sampling resistor R1 other ends ground connection.
- 10. a kind of light fixture, it is characterised in that driven including light emitting module and constant current as claimed in any one of claims 1-9 wherein Device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710666621.7A CN107396495B (en) | 2017-08-07 | 2017-08-07 | Constant-current driving device and lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710666621.7A CN107396495B (en) | 2017-08-07 | 2017-08-07 | Constant-current driving device and lamp |
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| CN107396495A true CN107396495A (en) | 2017-11-24 |
| CN107396495B CN107396495B (en) | 2023-04-25 |
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| CN201710666621.7A Active CN107396495B (en) | 2017-08-07 | 2017-08-07 | Constant-current driving device and lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108318847A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | A kind of purely resistive AC load of automatic constant current |
| CN108318719A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | A kind of stepless changing purely resistive AC load |
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| CN104661392A (en) * | 2013-11-25 | 2015-05-27 | 上海莱托思电子科技有限公司 | Constant-current driving circuit for LED switch |
| CN106332361A (en) * | 2016-09-20 | 2017-01-11 | 浙江阳光美加照明有限公司 | Frequency-flicker-free LED filament lamp |
| CN206365082U (en) * | 2016-12-21 | 2017-07-28 | 贵州恒芯微电子科技有限公司 | The linear constant current LED of invariable power circuit framework |
| CN207070412U (en) * | 2017-08-07 | 2018-03-02 | 深圳市明微电子股份有限公司 | Constant current driving device and light fixture |
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| CN104661392A (en) * | 2013-11-25 | 2015-05-27 | 上海莱托思电子科技有限公司 | Constant-current driving circuit for LED switch |
| CN106332361A (en) * | 2016-09-20 | 2017-01-11 | 浙江阳光美加照明有限公司 | Frequency-flicker-free LED filament lamp |
| CN206365082U (en) * | 2016-12-21 | 2017-07-28 | 贵州恒芯微电子科技有限公司 | The linear constant current LED of invariable power circuit framework |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108318847A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | A kind of purely resistive AC load of automatic constant current |
| CN108318719A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | A kind of stepless changing purely resistive AC load |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107396495B (en) | 2023-04-25 |
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