CN104540284A - LED illumination and dimming device - Google Patents
LED illumination and dimming device Download PDFInfo
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- CN104540284A CN104540284A CN201410811528.7A CN201410811528A CN104540284A CN 104540284 A CN104540284 A CN 104540284A CN 201410811528 A CN201410811528 A CN 201410811528A CN 104540284 A CN104540284 A CN 104540284A
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Abstract
The invention relates to an LED illumination and dimming device. The LED illumination and dimming device comprises a dimming signal module, an LED light source module, a power supply module, a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, wherein an H bridge type circuit formed by the first to the fourth switch units is arranged between the power supply module and the LED light source module, low color temperature LED lamps and high color temperature LED lamps in the LED light source module are distributed in the opposite directions, also distributed in an overlapped mode and connected in a matts structure to form a net structure, the dimming signal module controls the connection time of the first and the fourth switch units and the connection time of the second and the third switch units so that adjustment of the color temperature of the LED light source module can be realized. By means of the LED illumination and dimming device, power sources are reduced by a half, the layout of wires of the LED light source module is simpler and more reliable, and the LED illumination and dimming device is suitable for LED illumination devices with various color temperatures.
Description
The divisional application that the present invention is original applying number is 201210080393.2, original application day is on March 23rd, 2012, former denomination of invention is LED illumination light modulating device.
Technical field
The present invention relates to Switching Power Supply and electronic circuit technology, relating to a kind of is specifically the LED illumination light modulating device that LED light source module is powered and LED light source module adopts matrix net like to connect up by H bridge circuit.
Background technology
Two switching tubes in four switching tubes are connected; two other switching tube connects and passes through a common line and is communicated with; the load added on common line due to such connection draws often meeting as the printed words of a H; therefore H bridge of gaining the name; four switching tubes are commonly referred to brachium pontis, and middle common line is commonly referred to public brachium pontis.H-bridge circuit in same circuit, can make the output that the brachium pontis on both sides always keeps contrary, can the polarity of load be made to turn around when single supply like this, to meet the demand of the aspects such as motor driving.
LED is as a kind of new light sources of high benefit, owing to having life-span long, the advantage such as energy consumption is low, energy-conserving and environment-protective, just be widely used in the various occasions such as market, urban road, advertising lamp box, automotive lighting, along with the extensive use of LED, the requirement of people to LED is also more and more higher, defines the multiple demand that adjustment and multiple adjustment mode combine from single brightness regulation to colour temperature.In order to not affect the color temperature shift of LED, the LED great majority of degree of lightening and color-temperature regulating adopt PWM (Pulse Width Modulation, pulse width modulation) mode.
The LED light source module of adjustable color temperature conventional is at present divided into high color temperature and low colour temperature two kinds of unit modules usually, and current supply power mode is the LED light source module being respectively two kinds of colour temperatures powers, i.e. high color temperature unit one group of power supply, another group power supply of low colour temperature unit, simultaneously in order to keep the consistency of power, color-temperature regulating LED is usually using the power of monochrome temperature light source module as LED maximum power, when two kinds of color temperature light sources modules are simultaneously luminous, its maximum power is no more than monochromatic temperature light source module power, therefore two kinds of color temperature light sources modules are simultaneously luminous, when brightness is maximum, all with half-power work.In addition for making the light source colour mixture of different-colour even, during lamp pearl layout on lamp plate, low color temperature light sources lamp pearl and high color temperature light source lamp pearl need evenly overlapping, and often organize light source separate cabling, and this causes certain difficulty to distributing.Meanwhile, overlapping due to height color temperature light sources, the mode that the topological structure of lamp pearl arrangement must adopt multi-series and parallel join, under the type of drive of existing LED, when there being a LED to damage, just can affect the light-out effect of light fixture, formation blanking bar, affects the visual effect of light fixture.
Therefore adopt now PWM mode to regulate the mode of LED colour temperature, all there is the problem of power peak superposition.In order to avoid power overload situation, the AC-to DC adapter of LED, namely the power of power supply is all for lower limit is configured with the gross power of whole light source module.But the actual power loss maximum of LED only has about 1/2nd of power, so just cause the power waste of configuration, meanwhile, also cause that power supply volume is comparatively large, heavier-weight, the defect that cost is relatively high.
Documents 1 patent TOHKEMY 2000-161995A discloses the circuit that a kind of PWM drives, a kind of PWM drive circuit, it comprises CPU1, LED95 and 96 ,+DC, switch Tr1, Tr2, Tr3 and Tr4, switch Tr1, Tr2, Tr3 and Tr4 constitute H bridge circuit, CPU1 is connected with the excitation end of switch Trl, Tr2, Tr3 and Tr4 respectively by reverser 91-94, and one end of LED95 and 96 is connected to the C between switch Trl and Tr2
1place, the other end of LED95 and 96 is connected to the C between switch Tr3 and Tr4
2place ,+DC is connected between switch Trl and Tr3, the grounded emitter of Tr2 and T4.Disclosed in documents 1, PWM drive circuit is clearly the warning circuit in two-phase stepping motor, and is be that LED light device is powered by the supply power mode of H bridge in the present invention, with driving LED.
Documents 1 does not relate to the technical problem to be solved in the present invention completely.According to the record of documents 1 specification [0015-0016] section, the technical problem that documents 1 will solve is: how to solve diode and light respectively, to play the problem of alarm function.And the technical problem to be solved in the present invention is: the arrangement mode in conjunction with pwm signal and LED solves the waste of power configuration in prior art, power volume is comparatively large, heavier-weight and the relatively high problem of cost; Solve LED lamp bead placement-and-routing difficulty, a LED is damaged and causes LED module to produce blanking bar, and LED light device is without the problem of stroboscopic simultaneously.Both are completely uncorrelated.And the problem overcoming flicker is not only needed for warning, flicker can make the better effects if of reporting to the police on the contrary.So documents 1 does not need the problem solving LED flicker completely yet.
PWM drive circuit in documents 1 is the warning circuit in two-phase stepping motor, and its whole working stage is the form work with constant current, and each phase place of stepping motor has constant electric current.In stepping motor application, PWM inputs at the control chip end of H bridge, and PWM, as chopping wave constant current switching signal, with the feedback voltage on the feedback resistance of H bridge by comparator, produces the signal of different duty ratios.And H bridge circuit of the present invention is the pulse current form work with duty ratio, under each operating state, PWM is fixed duty cycle, for the break-make of control H bridge.Therefore, the working method of PWM drive circuit disclosed in documents 1 and H bridge circuit of the present invention is also different.
Be the arrangement mode of contrary arrangement between a kind of high and low colour temperature LED group disclosed in documents 2 patent W02011/126106A1, wherein, LED group 22B is not identical with the colour temperature of LED group 22A, the LED of LED group 22B embeds the fluorophor sending the white light of people about 5000 ° of K, it is high color temperature LED, the LED of LED group 22A embeds the fluorophor sending the white light of about 3000 ° of K, is low colour temperature LED.According to the record of documents 2 specification [0016-0019] section, documents 2 technical problem to be solved is: by LED1 and LED2 using anti-parallel connection to connect, to the form and aspect of illuminating lamp and the regulation and control of colour temperature, do not mention the problem solving LED light device stroboscopic completely.This and the present invention to solve " arrangement mode in conjunction with pwm signal and LED solves the waste that in prior art, power configures, and power volume is comparatively large, heavier-weight and the relatively high problem of cost; Solve LED lamp bead placement-and-routing difficulty, LED is damaged and causes LED module to produce blanking bar, and LED light device is without the problem of stroboscopic simultaneously " technical problem completely different.
Documents 2 discloses: low colour temperature LED group 22A and high color temperature LED group 22B is connected in parallel in the opposite direction, and LED group 22A and LED group 22B is made up of the LED element be connected in series respectively.But the high color temperature LED in the present invention and low colour temperature LED not only reversed arrangement, simultaneously high color temperature LED and the overlapping arrangement of low colour temperature LED, with the anatomical connectivity of matrix pattern, form network structure, realize regulating the colour temperature without stroboscopic of LED light device.Technical scheme of the present invention, by the arrangement of this LED, simplifies the wiring of LED, and meanwhile, this topological structure, when connecting up, also conveniently carries out the paving copper in large face, enhances radiating effect; When have LED damage open circuit time, just only have 1 not luminous, if but have LED damage short circuit, then have one group of longitudinal lamp not luminous.
And no matter the connected mode of the LED of documents 2 is the open circuit of LED or short circuit all can cause one group not luminous.Therefore, technical scheme of the present invention to produce technique effect time documents 2 arrangement mode do not reach.So documents 2 does not exist, technology of the present invention is enlightened.
Documents 3 patent CN1361651A discloses the overlapping arrangement of a kind of LED, with the anatomical connectivity of matrix pattern, forms network structure.But particularly, the resonant circuit in this technical scheme comprises at least one light-emitting diode pipe group 410, and it is formed in parallel in the same manner by each LED415 polarity.Each light-emitting diode pipe group 410 be made up of LED415 connects in a series arrangement.
And LED arrangement mode of the present invention is: in described LED light source module, low colour temperature LED and high color temperature LED are by the arrangement of contrary direction, low colour temperature LED and the overlapping arrangement of high color temperature LED simultaneously, with the anatomical connectivity of matrix pattern, forms network structure.Two kinds of arrangement modes are obviously different.So LED arrangement mode of the present invention is not disclosed by documents 3, and documents 2LED is reversed polarity to be connected, documents 3 is that same polarity connects, those skilled in the art have no reason, also unexpected by both combinations, even if both combinations also be can not get the arrangement mode of LED of the present invention, the technique effect that the arrangement mode of the LED of the present invention that also arrives can reach.
From documents 3 specification, documents 3 technical problem to be solved is: provide a kind of joint space-efficient power circuit of powering to LED array, make the transformation of traditional incandescent lamp traffic signals become comparatively easy." arrangement mode in conjunction with pwm signal and LED solves the waste that in prior art, power configures, and power volume is comparatively large, heavier-weight and the relatively high problem of cost with technical problem to be solved by this invention; Solve LED lamp bead placement-and-routing difficulty, a LED is damaged and causes LED module to produce blanking bar, and LED light device is without the problem of stroboscopic simultaneously " completely different.So there is not technology enlightenment in documents 3 couples of the present invention yet.
According to above-mentioned analysis, documents 1 is completely different from technical problem to be solved by this invention, disclosed in documents 1, the working method of PWM drive circuit and H bridge circuit of the present invention is also different simultaneously, and documents 1 brings technology to enlighten when researching and developing LED matrix can not to those skilled in the art.
The LED arrangement mode of documents 2 is only by high color temperature LED group 22A and low colour temperature LED group 22B by reverse arrangement, also different with technical problem solved by the invention.Documents 3 does not disclose the arrangement mode of LED in the present invention simultaneously, does not relate to the actual technical problem that will solve of the present invention completely yet.
So those skilled in the art are unexpected to combine to obtain the present invention by documents 1, documents 2 and documents 3.Can not obtain in conjunction with the circuit of documents 1 and the LED arrangement mode of documents 2,3 that of the present invention " arrangement mode in conjunction with pwm signal and LED solves the waste of power configuration in prior art, and power volume is comparatively large, heavier-weight and the relatively high problem of cost; Solve LED lamp bead placement-and-routing difficulty, LED is damaged and causes LED module to produce blanking bar, and LED light device is without the problem of stroboscopic simultaneously " technical scheme.
So documents 1, documents 2, documents 3 and combination thereof all do not have technology to enlighten to technical scheme of the present invention.
Summary of the invention
Problem solved by the invention, it is exactly comparatively large for power volume in prior art and the problem of LED lamp bead placement-and-routing difficulty, proposing a kind of H of employing bridge is the supply power mode that LED light source module is powered, the power demands of different-colour unit in LED light source module only need can be met with a power supply, make power volume reduce half, power utilization rate is improved and the simple LED illumination light modulating device of placement-and-routing's mode.
The present invention solves the problems of the technologies described above adopted technical scheme: LED illumination light modulating device, comprise dim signal module, LED light source module, supply module, first switch element, second switch unit, 3rd switch element and the 4th switch element, described first switch element, second switch unit, 3rd switch element and the 4th switch element form H bridge circuit, it is characterized in that, described dim signal module respectively with the first switch element, second switch unit, 3rd switch element is connected with the excitation end of the 4th switch element, one end of described LED light source module is connected between the first switch element and the 3rd switch element, the other end of described LED light source module is connected between second switch unit and the 4th switch element, the positive pole of described supply module is connected between the first switch element and second switch unit, negative pole is connected between second switch unit and the 4th switch element.
The technical scheme that the present invention is total, by the first switch element, second switch unit, 3rd switch element and the 4th switch element form H bridge circuit and are arranged between supply module and LED light source module, supply module and LED light source module is made to form two loops by the brachium pontis of H bridge, according to the characteristic of H bridge, H-bridge circuit can in same circuit, make the output that the brachium pontis on both sides always keeps contrary, can the polarity of load be made to turn around when single supply like this, therefore the both positive and negative polarity that LED in LED light source module is rationally set only is needed to connect and placement-and-routing's mode, whole lighting device can be realized only can need satisfy the demand with an input source, thus at least make power volume reduce half, improve power utilization rate, optimize illuminator structure, save cost greatly, dim signal module can control four switch elements respectively simultaneously, realize light modulation.
Further, described dim signal module comprises the first pwm pulse signal input, the second pwm pulse signal input, the first reverser and the second reverser, one end of described first pwm pulse signal input is connected with the first switch element, the other end is connected with one end of the first reverser, the other end of the first reverser is connected with the 3rd switch element, one end of described second pwm pulse signal input is connected with second switch unit, the other end is connected with one end of the second reverser, and the other end of the second reverser is connected with the 4th switch element.
The advantage of the program is, two pwm pulse signals are adopted to realize the brightness adjustment control of LED light source module, the first switch element and the 3rd switch element is controlled by a pwm pulse signal, another pwm pulse signal controls second switch unit and the 4th switch element, and circuit can be made to obtain certain simplification.
Further, described dim signal input comprises pwm pulse signal input, the first reverser, the second reverser and the 3rd reverser, one end of described pwm pulse signal input is connected with the first switch element, the other end is connected with the first reverser and the second reverser, the other end of the first reverser is connected with the 3rd switch element, the other end of the second reverser is connected with one end of second switch unit and the 3rd reverser respectively, and the other end of the 3rd reverser is connected with the 4th switch element.
The advantage of the program is, a pwm pulse signal is adopted to control all switch elements, mainly pass through setting direction device in circuit, the first switch element is made to keep identical signal with the 4th switch element, second switch unit keeps identical signal with the 3rd switch element, and the program can make circuit further be simplified.
Further, described first to fourth switch element is bipolar transistor or field-effect transistor.
Bipolar transistor and field-effect transistor application technology maturation, easy to use, circuit working can be made reliable and stable, and performance gets a promotion.
Concrete, described LED light source module comprises the luminescence unit of multiple parallel connection.
The program, by LED light source module is divided into multiple luminescence unit, is convenient to management and is controlled.
Further, described luminescence unit comprises the high color temperature unit of at least one group of parallel connection and low colour temperature unit, and described high color temperature unit and low colour temperature unit comprise the LED of multiple series connection respectively.
The advantage of the program is, further luminescence unit is divided into high color temperature unit and low colour temperature unit, makes whole LED light source module obtain further refinement, facilitates distributing in practical application.
Further, the positive pole of described high color temperature unit is connected with the negative pole of low colour temperature unit, and the negative pole of described high color temperature unit is connected with the positive pole of low colour temperature unit.
The advantage of this connected mode is, provides a kind of embodiment realizing powering respectively to high color temperature LED and low colour temperature LED, effectively improves the utilance of power supply.
Further, the negative pole of the LED of the low colour temperature unit that the positive pole of the LED that described high color temperature unit comprises is adjacent respectively connects, and the positive pole of the LED of the low colour temperature unit that the negative pole of the LED that described high color temperature unit comprises is adjacent respectively connects.
The advantage of the program is, provides a kind of matrix of LED netted wire laying mode, and this wire laying mode is when there being a LED lamp bead to damage, the LED lamp bead being only damage is not luminous, and whole string LED lamp bead can not be made not luminous, avoid the formation of blanking bar, affect the visual effect of light fixture.
Beneficial effect of the present invention is, be that LED light device is powered by the supply power mode of H bridge, the function of original two power supplys only just can be realized with a power supply, power supply is made to reduce half, save the energy greatly, also can realize the reticulated matrix formula wiring of LED lamp bead simultaneously, make LED light source module placement-and-routing more reliably simple and easy, thus simplify the production installation process of LED light device greatly, effectively reduce costs.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of LED illumination light modulating device of the present invention;
Fig. 2 is the logic diagram of LED light source module;
Fig. 3 is the schematic diagram that a kind of common mode of LED light source module connects;
Fig. 4 is the schematic diagram of a kind of reticulated matrix formula line of LED light source module;
Fig. 5 is the schematic diagram of a kind of preferred reticulated matrix formula line of LED light source module;
Fig. 6 is embodiment 1 circuit theory schematic diagram;
Fig. 7 is embodiment 2 circuit theory schematic diagram;
Fig. 8 is embodiment 3 circuit theory schematic diagram;
Wherein, LEDW is low colour temperature LED, and LEDC is high color temperature LED, and B1 is the first reverse swing door, and B2 is the second reverse swing door, and B3 is the 3rd reverse swing door.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail:
As shown in Figure 1, LED illumination light modulating device of the present invention, comprises dim signal module, switch element 1, switch element 2, switch element 3, switch element 4, LED light source module and input source VCC, the input of switch element 1 and switch element 2 is connected to VCC end, switch element 1 output is connected to switch element 3 input, switch element 2 output is connected to switch element 4 input, the output of switch element 3 and switch element 4 is connected to VSS end, LED light source module is connected between the tie point of switch element 1 and switch element 3 and the tie point of switch element 2 and switch element 4, 4 switch elements form a H-bridge circuit, a circuit loop is formed by switch element 1 and switch element 4, switch element 2 and switch element 3 form another current loop, electric current is alternately through two loops, light low colour temperature LED and high color temperature LED respectively, reach the object regulating colour temperature, this kind of method makes the utilance of power supply higher, and electric power system is simple and reliable, switch element simultaneously on H bridge four brachium pontis is relatively independent, what therefore the configuration of the control signal of four switch elements also became is easy.
A kind of preferred control signal configuration mode, 4 switch elements are controlled by two signal input parts, dim signal input comprises the first pwm pulse signal input, second pwm pulse signal input, first reverser and the second reverser, one end of first pwm pulse signal input is connected with switch element 1, the other end is connected with one end of the first reverser, the other end of the first reverser is connected with switch element 3, one end of second pwm pulse signal input is connected with switch element 2, the other end is connected with one end of the second reverser, the other end of the second reverser is connected with switch element 4, mode is by the first pwm pulse signal input control switch unit 1 and switch element 3, second pwm pulse signal input control switch unit 2 and switch element 4 with greetings.
Another kind of preferred control signal configuration mode, 4 switch elements are controlled by a signal input part, dim signal input comprises pwm pulse signal input, the first reverser, the second reverser and the 3rd reverser, one end of described pwm pulse signal input is connected with switch element 1, the other end is connected with the first reverser and the second reverser, the other end of the first reverser is connected with switch element 3, the other end of the second reverser is connected with one end of switch element 2 and the 3rd reverser respectively, and the other end of the 3rd reverser is connected with switch element 4.
H bridge is under four switch elements control, any time all only has the LED lamp bead in a direction luminous, namely only have high color temperature light source luminous, or only have low color temperature light sources luminous, as shown in Figure 2, LED light source module comprises multiple luminescence unit, luminescence unit is made up of high color temperature and low colour temperature unit, when switch element 1 and switch element 4 conducting, when switch element 2 and switch element 3 disconnect, a kind of LED of colour temperature is luminous; When switch element 1 and switch element 4 disconnect, when switch element 2 and switch element 3 conducting, the LED of another kind of colour temperature is luminous, is switched with the speed of certain frequency by two kinds of different-colours, thus realizes colour temperature adjustment.
As shown in Figure 3, be a kind of Basic Topological of LED light source module of the present invention, LEDW is low colour temperature LED, and LEDC is high color temperature LED.Multiple LEDW joins end to end and connects the low colour temperature unit of formation one, multiple LEDC joins end to end and connects formation high color temperature unit, again by the identical low colour temperature unit of quantity and the cross arrangement of high color temperature unit, and the both positive and negative polarity Opposite direction connection of low colour temperature unit and high color temperature unit, LED light source consisting module, when this structure simplifies traditional high color temperature and the overlapping arrangement of low colour temperature LED to a certain extent, the complexity of wiring, but still can not avoid, when a lamp pearl damages open circuit, all non-luminous problem of whole cluster of lamps, ornamental pearl.
As shown in Figure 4, for the another kind of Basic Topological of LED light source module of the present invention, low colour temperature LED LEDW and high color temperature LED LEDC arranges by contrary direction, low colour temperature LED and the overlapping arrangement of high color temperature LED simultaneously, with the anatomical connectivity of sphere of movements for the elephants type, form network structure.When this structure simplifies the overlapping arrangement in the loops such as traditional high color temperature and low colour temperature LED equally, the complexity of wiring, meanwhile, this topological structure, when connecting up, also conveniently carries out the paving copper in large face, enhances radiating effect; When have LED damage open circuit time, just only have 1 not luminous, if but have LED damage short circuit, then have one group of longitudinal lamp not luminous.
As shown in Figure 5, for the preferred topological structure of one of LED light source module of the present invention, multiple LEDW joins end to end and connects the low colour temperature unit of formation one, multiple LEDC joins end to end and connects formation high color temperature unit, again by one group low colour temperature unit and one group of high color temperature unit reversed arrangement, the low color temperature lamp LEDW of parallel position is connected with high color temperature lamp LEDC first place, form the structure of similar " well " word, LED light source module is formed again by this luminescence unit of some, adopt the light source module of this structure, arrangement is convenient, wiring is simple, also facilitate large area to spread copper simultaneously, strengthen radiating effect, adopt the light source module of this structure, when having the LED of simple grain to damage, if damage open circuit, then only have one not luminous, if when damaging short circuit, then two LED are not luminous at the most.
In order to more detailed description basic application process of the present invention and principle, now describe practical application mode of the present invention in detail by following examples, embodiment breaker in middle unit uses metal-oxide-semiconductor, and reverser uses reverse swing door:
Embodiment 1:
See Fig. 6, be the basic application circuit schematic diagram of the present invention, control signal PWM1, PWM2 are exported by control system, when control signal PWM1 is high level, control signal PWM2 is low level, and control signal PWM1 controls metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q4 conducting, and high color temperature LEDC is luminous; When control signal PWM2 is high level, control signal PWM1 is low level, and control signal PWM2 makes metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 conducting, and low colour temperature LEDW is luminous.Time the frequency of PWM1 and PWM2 is sufficiently high, the light of the high color temperature that LED sends and low colour temperature, with regard to the colour temperature of colour mixture one-tenth between high color temperature and low colour temperature, by changing the high level time of PWM1 and PWM2, can realize the adjustment of colour temperature.
Embodiment 2:
See Fig. 7, for a kind of advantageous applications circuit theory diagrams of the present invention, control signal PWM1 and PWM2 is exported by control system, when control signal PWM1 position high level, control signal PWM2 is low level, control signal PWM1 controls metal-oxide-semiconductor Q1 conducting, control signal PWM1 oppositely makes metal-oxide-semiconductor Q3 turn off by reverse swing door B1, control signal PWM2 controls metal-oxide-semiconductor Q2 and turns off, and control signal PWM2 makes metal-oxide-semiconductor Q4 conducting by reverse swing door, and electric current flows through metal-oxide-semiconductor Q1, flow through high color temperature LEDC, by metal-oxide-semiconductor Q4, get back to VSS end, high color temperature LEDW is luminous; When control signal PWM2 position high level, control signal PWM1 is low level, control signal PWM2 controls metal-oxide-semiconductor Q2 conducting, control signal PWM2 oppositely makes metal-oxide-semiconductor Q4 turn off by reverse swing door B2, and control signal PWM1 controls metal-oxide-semiconductor Q1 and turns off, and control signal PWM1 makes metal-oxide-semiconductor Q3 conducting by reverse swing door, electric current flows through metal-oxide-semiconductor Q2, low colour temperature LEDW, by metal-oxide-semiconductor Q3, get back to VSS end, low colour temperature LEDW is luminous.Time the frequency of PWM1 and PWM2 is sufficiently high, the light of the high color temperature that LED sends and low colour temperature, with regard to the colour temperature of colour mixture one-tenth between high color temperature and low colour temperature, by changing the high level time of PWM1 and PWM2, can realize the adjustment of colour temperature.
Embodiment 3:
See Fig. 8, be the another kind of advantageous applications circuit theory diagrams of the present invention, control signal PWM is exported by control system, when control signal PWM is high level, metal-oxide-semiconductor Q1 conducting, control signal makes metal-oxide-semiconductor Q3 turn off through reverse swing door B1, and control signal makes metal-oxide-semiconductor Q2 turn off through reverse swing door B3, control signal makes metal-oxide-semiconductor Q4 conducting through reverse swing door B2 again through reverse swing door B3, electric current flows through metal-oxide-semiconductor Q1, flows through high color temperature LEDC, by metal-oxide-semiconductor Q4, get back to VSS end, high color temperature LEDC is luminous; When control signal PWM is low level, metal-oxide-semiconductor Q1 turns off, control signal makes metal-oxide-semiconductor Q3 conducting through reverse swing door B1, control signal makes metal-oxide-semiconductor Q2 conducting through reverse swing door B3, and control signal makes metal-oxide-semiconductor Q4 turn off through reverse swing door B2 through reverse swing door B3 again, and electric current flows through metal-oxide-semiconductor Q2, electric current is through too low colour temperature LEDW, by metal-oxide-semiconductor Q3, get back to VSS end, low colour temperature LEDW is luminous.Time the frequency of PWM is sufficiently high, the light of the high color temperature that LED sends and low colour temperature, with regard to the colour temperature of colour mixture one-tenth between high color temperature and low colour temperature, by changing the high level time of PWM1, can realize the adjustment of colour temperature.
The colour temperature adopting the LED light device based on the adjustable color of H bridge to realize regulates, when lamp luminescence, the moment keeps identical power output, if the light efficiency of the high color temperature adopted and the LED lamp bead of low temperature is close, so its luminous flux exported also maintains a stable state, and namely the mode of this color-temperature regulating is that the colour temperature achieved without stroboscopic regulates.
Claims (5)
1. a LED illumination light modulating device, comprise dim signal module, LED light source module, supply module, the first switch element (Q1), second switch unit (Q2), the 3rd switch element (Q3) and the 4th switch element (Q4), it is characterized in that, the first switch element (Q1), second switch unit (Q2), the 3rd switch element (Q3) and the 4th switch element (Q4) form H bridge circuit and are arranged between supply module and LED light source module; Wherein, one end of described LED light source module is connected between the first switch element (Q1) and the 3rd switch element (Q3), the other end of described LED light source module is connected between second switch unit (Q2) and the 4th switch element (Q4), and the positive pole of described supply module is connected between the first switch element (Q1) and second switch unit (Q2), negative pole is connected between the 3rd switch element (Q3) and the 4th switch element (Q4);
Described LED light source module comprises the luminescence unit of multiple parallel connection, described luminescence unit is made up of the high color temperature unit of at least one group of parallel connection and low colour temperature unit, described high color temperature unit and low colour temperature unit comprise the LED of multiple series connection respectively, in described LED light source module, low colour temperature LED and high color temperature LED are by the arrangement of contrary direction, low colour temperature LED and the overlapping arrangement of high color temperature LED simultaneously, with the anatomical connectivity of matrix pattern, form network structure;
Described dim signal module controls conducting first switch element simultaneously (Q1) and the 4th switch element (Q4) or while conducting second switch unit (Q2) and the 3rd switch element (Q3), and control the ON time of the first switch element (Q1) and the 4th switch element (Q4) and the ON time of second switch unit (Q2) and the 3rd switch element (Q3), to make realization to the adjustment of the colour temperature of described LED light source module.
2. LED illumination light modulating device as claimed in claim 1, it is characterized in that, described dim signal module comprises the first pwm pulse signal input, the second pwm pulse signal input, described first pwm pulse signal input is connected with the excitation end of the first switch element (Q1) and the 4th switch element (Q4) respectively, and described second pwm pulse signal input is connected with the excitation end of second switch unit (Q2) and the 3rd switch element (Q3) respectively.
3. LED illumination light modulating device as claimed in claim 1, it is characterized in that, described dim signal module comprises the first pwm pulse signal input, second pwm pulse signal input, first reverser and the second reverser, described first pwm pulse signal input is connected with the excitation end of the first switch element (Q1) and the input of the first reverser (B1) respectively, the output of the first reverser (B1) is connected with the excitation end of the 3rd switch element (Q3), described second pwm pulse signal input is connected with the excitation end of second switch unit (Q2) and the input of the second reverser (B2) respectively, the output of the second reverser (B2) is connected with the excitation end of the 4th switch element (Q4).
4. LED illumination light modulating device as claimed in claim 1, it is characterized in that, described dim signal module comprises pwm pulse signal input, first reverser (B1), second reverser (B2) and the 3rd reverser (B3), described pwm pulse signal input respectively with the excitation end of the first switch element (Q1), first reverser (B1) is connected with the input of the 3rd reverser (B3), the output of the first reverser (B1) is connected with the excitation end of the 3rd switch element (B3), the output of the 3rd reverser (B3) is connected with the excitation end of second switch unit (Q2) and the input of the second reverser (Q2) respectively, the output of the second reverser (B2) encourages to hold with the 4th switch element (Q4) and is connected.
5. the LED illumination light modulating device as described in one of Claims 1 to 4, is characterized in that, described first to fourth switch element is bipolar transistor or field-effect transistor.
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| CN201410811528.7A CN104540284A (en) | 2012-03-23 | 2012-03-23 | LED illumination and dimming device |
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| CN201410811528.7A CN104540284A (en) | 2012-03-23 | 2012-03-23 | LED illumination and dimming device |
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| CN201210080393.2A Division CN102612231B (en) | 2012-03-23 | 2012-03-23 | LED (Light-Emitting Diode) illumination dimming device |
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| CN109121260A (en) * | 2018-10-26 | 2019-01-01 | 叶姜 | The positive and negative low-loss LED lamp driving circuit connect |
| CN110267400A (en) * | 2019-06-20 | 2019-09-20 | 广州市微生物研究所 | A kind of test macro applied to LED light test fixture |
| CN112105110A (en) * | 2020-09-12 | 2020-12-18 | 深圳市维盛泰光电有限公司 | Multipurpose two-wire drive circuit |
| CN112149199A (en) * | 2020-09-21 | 2020-12-29 | 成都奔流标识制作有限责任公司 | Luminous body arrangement method, luminous system and identification device |
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