CN223093926U - Flash eliminating circuit, lamp and lighting system - Google Patents
Flash eliminating circuit, lamp and lighting system Download PDFInfo
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- CN223093926U CN223093926U CN202422187560.4U CN202422187560U CN223093926U CN 223093926 U CN223093926 U CN 223093926U CN 202422187560 U CN202422187560 U CN 202422187560U CN 223093926 U CN223093926 U CN 223093926U
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Abstract
本实用新型涉及照明技术领域，公开了一种回闪消除电路、灯具及照明系统。本实用新型提供的回闪消除电路，通过设置防回闪电路，通过防回闪电路的第一供电端与第一电源端或第二电源端连接取电，第一控制端与第一电容连接或者连接在恒压芯片的输出端与第二信号端之间，通过防回闪电路消耗第一电容的电量或者拉低第二信号端的信号，从而控制后级驱动电路输出驱动信号以消除回闪现象，有效避免了因灯具回闪现象给用户带来不适，同时提高用户体验。
The utility model relates to the field of lighting technology, and discloses a flashback elimination circuit, a lamp, and a lighting system. The flashback elimination circuit provided by the utility model is provided with an anti-flashback circuit, wherein the first power supply end of the anti-flashback circuit is connected to the first power supply end or the second power supply end to obtain power, the first control end is connected to the first capacitor or is connected between the output end of the constant voltage chip and the second signal end, and the anti-flashback circuit consumes the power of the first capacitor or pulls down the signal of the second signal end, thereby controlling the output of the driving signal of the subsequent driving circuit to eliminate the flashback phenomenon, effectively avoiding the discomfort caused to the user by the flashback phenomenon of the lamp, and improving the user experience at the same time.
Description
Technical Field
The utility model belongs to the technical field of illumination, and particularly relates to a flashback eliminating circuit, a lamp and an illumination system.
Background
The dimming driving in the market at present adopts a two-stage scheme, such as a front-stage constant voltage back-stage constant current, and an optocoupler transformer isolation scheme is adopted between a dimming signal end and an LED dimming driving output end. The PWM signal of the driving scheme is directly coupled to the PWM input end of the post-stage dimming driving after the module end is isolated by the optical coupler, so that the output current of the PWM signal is controlled by the PWM signal, the scheme is easy to generate a back flash phenomenon in the using process, in particular, when the dimming drive is in a low brightness state, the AC220V power supply is cut off, the brightness of the lamp suddenly lightens and flickers to enter a power-off state, and the backflash phenomenon not only affects the normal use of a user, but also easily causes discomfort to the user and even eye injury to the user.
Disclosure of utility model
In order to solve the defects in the prior art, the utility model provides a back flashing eliminating circuit, a lamp and a lighting system, wherein the back flashing eliminating circuit is connected with a first power supply end or a second power supply end through a first power supply end of an anti-back flashing circuit to obtain electricity, and a first control end is connected with a first capacitor or connected between an output end of a constant voltage chip and a second signal end so as to control a back driving circuit to output a driving signal, thereby avoiding the back flashing phenomenon.
The technical effects to be achieved by the utility model are realized by the following aspects:
In a first aspect, the present utility model provides a flashback cancellation circuit, comprising:
The front-stage constant voltage circuit is provided with a first input end, a first power end and a second power end, wherein the first input end is connected with an input mains supply, and the first power end is connected with the anode of the LED light source through a first diode;
the dimming circuit is connected with the second power supply end and is used for receiving a dimming signal and converting the dimming signal into a PWM signal, and the PWM signal is output through a first signal end of the dimming circuit;
the rear-stage driving circuit comprises a constant voltage chip, a rear-stage driving chip and a first capacitor, wherein the power input ends of the constant voltage chip and the rear-stage driving chip and the first capacitor are connected with the output end of a first diode to obtain electricity, the rear-stage driving chip is provided with a second signal end and a driving output end, the second signal end is connected with the first signal end and the output end of the constant voltage chip, and the driving output end is connected with the negative electrode of the LED light source;
The anti-back flash circuit is provided with a first power supply end and a first control end, the first power supply end is connected with the first power supply end or the second power supply end to obtain electricity, and the first control end is connected with the first capacitor or connected between the output end of the constant voltage chip and the second signal end so as to control the rear-stage driving circuit to output driving signals.
In some implementations, the anti-backflash circuit includes a third diode, a third capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a triode,
The input end of the third diode is a first power supply end, the input end of the third diode is connected with the first power supply end, and the output end of the third diode is connected with the third capacitor, the base electrode of the triode, the fourth resistor and the sixth resistor through a seventh resistor;
The emitter of the triode is connected with a fifth resistor, and the collector of the triode is grounded, wherein the other end of the fifth resistor is a first control end, and the other end of the fifth resistor is connected with a first capacitor;
the other ends of the fourth resistor and the third capacitor are grounded, and the other end of the sixth resistor is connected with the output end of the first diode.
In some implementations, the anti-flashback circuit includes a third diode, a fourth resistor and a second optocoupler,
The input end of the third diode is a first power supply end, the input end of the third diode is connected with a second power supply end, and the output end of the third diode is connected with the first end of the second optocoupler through a fourth resistor;
The fourth end and the third end of the second optocoupler are first control ends, the fourth end is connected with the output end of the constant voltage chip, the third end is connected with the second signal end, and the second end is grounded.
In some implementations, the pre-stage constant voltage circuit includes an AC-DC chip and a transformer,
The input end of the AC-DC chip is a first input end, and the output end of the AC-DC chip is connected with the transformer;
The first power end and the second power end are arranged on the transformer to output power supply.
In some implementations, the dimming circuit includes a dimming chip, a first optocoupler, a first resistor and a second diode,
The input end of the second diode is connected with the second power supply end;
The dimming chip is provided with a signal input end, a signal output end and a second power supply end, the second power supply end is connected with the output end of the second diode, the signal input end is connected with external adjusting equipment, and the signal output end is connected with the second end of the first optical coupler;
The first end of the first optocoupler is connected with the output end of the second diode through a first resistor, the fourth end of the first optocoupler is a first signal end, PWM signals are output to the backward driving circuit, and the third end of the first optocoupler is grounded.
In some implementations, the output terminal of the second diode is further connected to a second capacitor, and the other end of the second capacitor is grounded.
In some implementations, the signal input of the dimming chip is configured to receive a dimming signal of 0-10V.
In some implementations, the rear stage driving circuit is further provided with a second resistor and a third resistor, the other end of the second resistor is grounded, and the third resistor is connected between the output end of the constant voltage chip and the second signal end, or between the output end of the constant voltage chip and the first control end.
In a second aspect, the utility model provides a lamp, which comprises an integrated circuit board and an LED light source, wherein the integrated circuit board is integrated with the flashback eliminating circuit, and the integrated circuit board is electrically connected with the LED light source through the flashback eliminating circuit.
In this implementation manner, the flashback eliminating circuit is integrated in an integrated circuit board of the lamp, the integrated circuit board can be located in a driving part of the lamp or a circuit board part of the whole lamp, the turn-on and turn-off of the LED light source are realized through the flashback eliminating circuit, the dimming circuit controls the brightness adjustment of the lamp by receiving the dimming signal of 0-10V when the LED light source is turned on, and the LED light source is turned off to consume the electric quantity of the first capacitor through the flashback preventing circuit or pull down the signal of the second signal end, so that the rear driving circuit is controlled to output the driving signal, and the flashback phenomenon is eliminated.
In a third aspect, the present utility model provides a lighting system, comprising a control terminal and a luminaire as described above;
the control terminal is electrically connected with the driving power supply of the lamp, and/or
And the control terminal performs information interaction with the driving power supply.
In this implementation mode, lighting system can be applied to among the wisdom illumination of various use modes and application scene, through the interaction of control terminal and lamps and lanterns, can realize lighting device's intelligent regulation, has realized the wisdom illumination function of multi-scenario multipurpose to prevent back flashing phenomenon's appearance after lamps and lanterns close, promote user experience.
In summary, the present utility model has at least the following advantages:
According to the flashback eliminating circuit provided by the utility model, the flashback preventing circuit is arranged, the first power supply end of the flashback preventing circuit is connected with the first power supply end or the second power supply end to obtain electricity, the first control end is connected with the first capacitor or is connected between the output end of the constant voltage chip and the second signal end, and the flashback preventing circuit consumes the electric quantity of the first capacitor or pulls down the signal of the second signal end, so that the rear-stage driving circuit is controlled to output a driving signal to eliminate the flashback phenomenon. The discomfort brought to the user due to the lamp back flash phenomenon is effectively avoided, and meanwhile, the user experience is improved.
Drawings
Fig. 1 is a schematic diagram of a flash back cancellation circuit according to embodiment 1 of the present utility model.
Fig. 2 is a first circuit schematic of the flash back cancellation circuit of embodiment 2 of the present utility model.
Fig. 3 is a second circuit schematic of the flash back cancellation circuit of embodiment 3 of the present utility model.
The marks in the figure:
110. A pre-stage constant voltage circuit; 120 parts of dimming circuit, 130 parts of rear-stage driving circuit, 140 parts of anti-backflash circuit, 150 parts of LED light source;
The LED lamp comprises an AC-DC chip, a DC-DC chip, a transformer, a D1, a first diode, a D2, a second diode, a D3, a third diode, a U1, a dimming chip, a U2, a first optocoupler, a U3, a rear-stage driving chip, a U4, a constant voltage chip, a U5, a second optocoupler, an EC1, a first capacitor, an EC2, a second capacitor, a C3, a third capacitor, an R1, a first resistor, an R2, a second resistor, an R3, a third resistor, an R4, a fourth resistor, an R5, a fifth resistor, an R6, a sixth resistor, an R7, a seventh resistor, and a Q1 and a triode.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The described embodiments are some, but not all, embodiments of the utility model.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.
Example 1:
Referring to fig. 1, the present embodiment provides a back-flash eliminating circuit, which includes a front-stage constant voltage circuit 110, a dimming circuit 120, a rear-stage driving circuit 130 and a back-flash preventing circuit 140, wherein the front-stage constant voltage circuit 110 is provided with a first input terminal, a first power terminal t1_13 and a second power terminal t1_9, the first input terminal is connected with an input mains supply, the first power terminal t1_13 is connected with an anode of an LED light source 150 through a first diode D1, the front-stage constant voltage circuit 110 is used for converting the input mains supply into a power supply of each circuit according to the embodiments of the present utility model, the input mains supply may be a 220V AC circuit, and the front-stage constant voltage circuit 110 is provided with a rectifier bridge or an AC-DC circuit for rectifying and outputting the AC power. Further, the front-stage constant voltage circuit 110 may output a plurality of sets of power sources of different voltage values through the transformer T1, respectively, to supply power to the back-end circuit.
The dimming circuit 120 is connected to the second power supply terminal t1_9 for taking power, and is configured to receive a dimming signal and convert the input dimming signal into a PWM signal, where the PWM signal is output through the first signal u2_4 terminal of the dimming circuit 120, and the dimming circuit 120 is configured to be connected to the control terminal, obtain a voltage value of the dimming signal, convert the dimming signal into the PWM signal, and output the PWM signal to the rear driving circuit 130 for driving and outputting.
The back-stage driving circuit 130 comprises a constant voltage chip U4, a back-stage driving chip U3 and a first capacitor EC1, wherein the constant voltage chip U4, a power input end of the back-stage driving chip U3 and the first capacitor EC1 are connected with an output end of a first diode D1 to obtain power, the back-stage driving chip U3 is provided with a second signal end U3_PWM and a driving output end U3_C-, the second signal end U3_PWM is connected with the first signal end U2_4 and an output end of the constant voltage chip U4, the driving output end U3_C is connected with a cathode of the LED light source 150, and the back-stage driving circuit 130 is used for receiving PWM signals and controlling the cathode of the LED light source 150 through the PWM signals so as to realize the operations of opening, closing, dimming and the like of the LED light source 150.
The anti-backflash circuit 140 is provided with a first power supply end and a first control end, the first power supply end is connected with the first power supply end or the second power supply end to obtain electricity, and the first control end is connected with the first capacitor EC1 or between the output end of the constant voltage chip U4 and the second signal end to control the rear-stage driving circuit 130 to output a driving signal. The anti-back-flash circuit 140 is used for consuming the electric quantity of the first capacitor EC1 or pulling down the signal of the second signal terminal, so as to control the post-stage driving circuit 130 to output the driving signal to eliminate the back-flash phenomenon.
Example 2:
Referring to fig. 2, an embodiment of a back-flash eliminating circuit of the present utility model is based on embodiment 1, and the present utility model further provides a specific implementation manner of the back-flash eliminating circuit 140, wherein the back-flash eliminating circuit 140 includes a third diode D3, a third capacitor C3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a triode Q1, an input end of the third diode D3 is a first power supply end, an input end of the third diode D3 is connected with a first power supply end, an output end of the third diode D3 is connected with the third capacitor C3, a base electrode of the triode Q1, the fourth resistor R4 and the sixth resistor R6 through a seventh resistor R7, an emitter electrode of the triode Q1 is connected with the fifth resistor R5, a collector electrode is grounded, another end of the fifth resistor R5 is a first control end, another end of the fifth resistor R5 is connected with the first capacitor R1, another end of the fourth resistor R4 is connected with the other end of the third capacitor C3, and another end of the third resistor R6 is connected with the other end of the third resistor R1.
The pre-stage constant voltage circuit 110 comprises an AC-DC chip AC-DC and a transformer T1, wherein the input end of the AC-DC chip AC-DC is a first input end, the output end of the AC-DC chip AC-DC is connected with the transformer T1, and the first power end and the second power end are arranged on the transformer T1 to output a power supply. The pre-stage constant voltage circuit 110 is used to convert an input commercial power, which may be a 220V AC circuit, into a power supply of each circuit of the present utility model, and the pre-stage constant voltage circuit 110 is provided with, for example, a rectifier bridge or an AC-DC circuit to rectify and output the AC power. Further, the front-stage constant voltage circuit 110 may output a plurality of sets of power sources of different voltage values through the transformer T1, respectively, to supply power to the back-end circuit. The types of the AC-DC chip AC-DC include, but are not limited to, NXP Enzhi pump TEA2016AAT, EG4318A, micro-CX 75GD080BL, micro-CX 75GE030D, south core technology SC3005N, south core technology SC3501 and the like.
The dimming circuit 120 comprises a dimming chip U1, a first optocoupler U2, a first resistor R1 and a second diode D2, wherein the input end of the second diode D2 is connected with a second power supply end, the dimming chip U1 is provided with a signal input end, a signal output end and a second power supply end, the second power supply end is connected with the output end of the second diode D2, the signal input end is connected with external adjusting equipment, the signal output end is connected with the second end of the first optocoupler U2, the first end of the first optocoupler U2 is connected with the output end of the second diode D2 through the first resistor R1, the fourth end is used for outputting PWM signals to the backward driving circuit 130 through the first signal end, and the third end is grounded. The output end of the second diode D2 is also connected with a second capacitor EC2, and the other end of the second capacitor EC2 is grounded. The signal input end of the dimming chip U1 is used for receiving a dimming signal of 0-10V. Wherein, the chip model of converting the voltage signal into the PWM signal comprises but is not limited to GP9303、GP9303M、NCP1397ADR2G、TPS61161DRVR、LN2266PB2MR-G、TL494L-D16-T、OB2532AMP、KP201LGA、SC8701QDER、CL2224IL.
The rear stage driving circuit 130 is further provided with a second resistor R2 and a third resistor R3, the other end of the second resistor R2 is grounded, and the third resistor R3 is connected between the output end of the constant voltage chip U4 and the second signal end, or the third resistor R3 is connected between the output end of the constant voltage chip U4 and the first control end. Among them, the chip types of the post-stage driver chip U3 include, but are not limited to, VAS1254, BP2875, iW338, and BP2876D. The model of the constant voltage chip U4 is any one of NS6322B, CL1552, MP1476 and JW 5116F.
The specific working principle of the embodiment is that the current-stage constant voltage circuit 110 is connected with an AC220V power supply, and the first power supply end and the second power supply end respectively output direct current power supplies outwards. The first power end outputs DC50V to the constant voltage chip U4, the back stage driving chip U3 and the positive electrode of the LED light source 150 through the first diode D1, and the constant voltage chip U4 converts the input DC50V voltage into DC 5V and outputs the DC 5V to the second signal end of the back stage driving chip U3 through the third resistor R3 through the output end of the constant voltage chip U4. The first end of the second optocoupler U5 of the dimming circuit 120 is provided with an upward bias on voltage by the second power end, and the rear driving chip U3 converts the input voltage into a constant current and outputs the constant current to the cathode of the LED light source 150. The first power supply terminal also supplies power to the anti-backflash circuit 140 through the third diode D3, the power supply transmitted from the third diode D3 supplies reverse bias to the triode Q1 through the seventh resistor R7, the triode Q1 is cut off, and the anti-backflash circuit 140 does not work. The second power supply terminal outputs DC12V to the dimming chip U1 of the dimming circuit 120 through the second diode D2, and simultaneously supplies an upper bias voltage to the first terminal of the first optocoupler U2 through the first resistor R1, the dimming chip U1 converts the dimming signal varying between 0 and 10V of the signal input terminal into a PWM signal, and the PWM signal is output to the second terminal of the first optocoupler U2 through the signal output terminal, coupled to the fourth terminal through the first optocoupler U2 for output, and supplied to the rear driving chip U3 to control the current flowing through the LED light source 150.
When the signal input end of the dimming chip U1 is 9.5V, the signal output end outputs high level, and when the signal input end is smaller than 0.5V, the signal output end outputs 0V. The voltage variation range of the signal input end is between 0.5 and 9.5V, and the signal output end outputs PWM signals with corresponding duty ratios. The lower the voltage of the signal input end is, the smaller the duty ratio of the PWM signal of the signal output end is, the PWM signal is coupled to the second signal end of the rear-stage driving chip U3 through the isolation of the first optocoupler U2, the smaller the output current of the driving output end of the rear-stage driving chip U3 is, the lower the brightness of the LED light source 150 is, and otherwise, the larger the output current of the driving output end of the rear-stage driving chip U3 is, the brighter the LED light source 150 is.
When the voltage of the signal input end of the dimming chip U1 is lower, for example, 1V, the duty ratio of the PWM signal output end output by the signal output end is lower, the PWM signal is output to the second signal end of the rear-stage driving chip U3 from the fourth end of the first optocoupler U2, at the moment, the rear-stage driving chip U3 is controlled by the PWM signal to reduce the output current of the driving output end and is in a low brightness state, at the moment, the AC220V input is disconnected, the output voltage of the first diode D1 and the second diode D2 is rapidly reduced, the voltage of the output end of the third diode D3 is firstly consumed, the voltage on the third capacitor C3 is rapidly reduced, the Q1 is the base voltage of the PNP triode and is lower than the voltage of the emitter, the emitter and the collector electrode of the triode Q1 are connected to form a loop, and the electric energy consumption in the first capacitor EC1 is rapidly completed, meanwhile, a part of the electric energy is stored in the second capacitor EC2 and is rapidly supplied to the chip U1, the working end of the output signal is enabled to be consumed by the first capacitor U1, the light source is still not consumed by the light source 150, the light source is continuously supplied to the first capacitor U1, and the light source is continuously driven by the first LED light source 150 after the output current is continuously supplied to the triode U1, and the light source 150 is continuously consumed by the light source.
According to the utility model, by arranging the anti-backflash circuit 140, the first power supply end of the anti-backflash circuit 140 is connected with the power supply end, the first control end is connected with the first capacitor EC1, and the anti-backflash circuit 140 consumes the electric quantity of the first capacitor EC1, so that the rear-stage driving circuit 130 is controlled to output a driving signal to eliminate backflash phenomenon. The discomfort brought to the user due to the lamp back flash phenomenon is effectively avoided, and meanwhile, the user experience is improved.
Example 3:
Referring to fig. 3, the present utility model provides an embodiment of a back-flash eliminating circuit, based on embodiment 1, the present utility model further provides another embodiment of a back-flash preventing circuit 140, which includes a third diode D3, a fourth resistor R4 and a second optocoupler U5, wherein an input end of the third diode D3 is a first power supply end, an input end of the third diode D3 is connected to a second power supply end, an output end of the third diode D3 is connected to a first end of the second optocoupler U5 through a fourth resistor R4, a fourth end of the second optocoupler U5 and a third end of the third optocoupler U5 are a first control end, the fourth end of the second optocoupler U is connected to an output end of the constant-voltage chip U4, and the third end of the second optocoupler U is connected to a second signal end.
The pre-stage constant voltage circuit 110 comprises an AC-DC chip AC-DC and a transformer T1, wherein the input end of the AC-DC chip AC-DC is a first input end, the output end of the AC-DC chip AC-DC is connected with the transformer T1, and the first power end and the second power end are arranged on the transformer T1 to output a power supply. The pre-stage constant voltage circuit 110 is used to convert an input commercial power, which may be a 220V AC circuit, into a power supply of each circuit of the present utility model, and the pre-stage constant voltage circuit 110 is provided with, for example, a rectifier bridge or an AC-DC circuit to rectify and output the AC power. Further, the front-stage constant voltage circuit 110 may output a plurality of sets of power sources of different voltage values through the transformer T1, respectively, to supply power to the back-end circuit. The types of the AC-DC chip AC-DC include, but are not limited to, NXP Enzhi pump TEA2016AAT, EG4318A, micro-CX 75GD080BL, micro-CX 75GE030D, south core technology SC3005N, south core technology SC3501 and the like.
The dimming circuit 120 comprises a dimming chip U1, a first optocoupler U2, a first resistor R1 and a second diode D2, wherein the input end of the second diode D2 is connected with a second power supply end, the dimming chip U1 is provided with a signal input end, a signal output end and a second power supply end, the second power supply end is connected with the output end of the second diode D2, the signal input end is connected with external adjusting equipment, the signal output end is connected with the second end of the first optocoupler U2, the first end of the first optocoupler U2 is connected with the output end of the second diode D2 through the first resistor R1, the fourth end is used for outputting PWM signals to the backward driving circuit 130 through the first signal end, and the third end is grounded. The output end of the second diode D2 is also connected with a second capacitor EC2, and the other end of the second capacitor EC2 is grounded. The signal input end of the dimming chip U1 is used for receiving a dimming signal of 0-10V. Wherein, the chip model of converting the voltage signal into the PWM signal comprises but is not limited to GP9303、GP9303M、NCP1397ADR2G、TPS61161DRVR、LN2266PB2MR-G、TL494L-D16-T、OB2532AMP、KP201LGA、SC8701QDER、CL2224IL.
The rear stage driving circuit 130 is further provided with a second resistor R2 and a third resistor R3, the other end of the second resistor R2 is grounded, and the third resistor R3 is connected between the output end of the constant voltage chip U4 and the second signal end, or the third resistor R3 is connected between the output end of the constant voltage chip U4 and the first control end. Among them, the chip types of the post-stage driver chip U3 include, but are not limited to, VAS1254, BP2875, iW338, and BP2876D. The model of the constant voltage chip U4 is any one of NS6322B, CL1552, MP1476 and JW 5116F.
The specific working principle of the embodiment is that the current-stage constant voltage circuit 110 is connected with an AC220V power supply, and the first power supply end and the second power supply end respectively output direct current power supplies outwards. The first power end outputs DC50V to the constant voltage chip U4, the rear driving chip U3 and the positive electrode of the LED light source 150 through the first diode D1, the constant voltage chip U4 converts the input DC50V voltage into DC 5V and passes through the output end of the constant voltage chip U4, the output end of the constant voltage chip U4 passes through the third resistor R3, and the output end of the constant voltage chip U4 is input to the 3 pin through the 4 pin of the second optocoupler U5, and then the output end of the constant voltage chip U4 is output to the second signal end of the rear driving chip U3. The first end of the second optocoupler U5 of the dimming circuit 120 is provided with an upward bias on voltage by the second power end, and the rear driving chip U3 converts the input voltage into a constant current and outputs the constant current to the cathode of the LED light source 150. The second power supply terminal outputs DC12V to the dimming chip U1 of the dimming circuit 120 through the second diode D2, and simultaneously supplies an upper bias voltage to the first terminal of the first optocoupler U2 through the first resistor R1, the dimming chip U1 converts the dimming signal varying between 0 and 10V of the signal input terminal into a PWM signal, and the PWM signal is output to the second terminal of the first optocoupler U2 through the signal output terminal, coupled to the fourth terminal through the first optocoupler U2 for output, and supplied to the rear driving chip U3 to control the current flowing through the LED light source 150. The second power supply terminal further provides a turn-on voltage to the first terminal of the second optocoupler U5 through the third diode D3, and the output terminal of the third diode D3 is grounded through the second terminal of the second optocoupler U5 after providing a turn-on voltage to the first terminal of the second optocoupler U5 through the fourth resistor R4.
When the signal input end of the dimming chip U1 is 9.5V, the signal output end outputs high level, and when the signal input end is smaller than 0.5V, the signal output end outputs 0V. The voltage variation range of the signal input end is between 0.5 and 9.5V, and the signal output end outputs PWM signals with corresponding duty ratios. The lower the voltage of the signal input end is, the smaller the duty ratio of the PWM signal of the signal output end is, the PWM signal is coupled to the second signal end of the rear-stage driving chip U3 through the isolation of the first optocoupler U2, the smaller the output current of the driving output end of the rear-stage driving chip U3 is, the lower the brightness of the LED light source 150 is, and otherwise, the larger the output current of the driving output end of the rear-stage driving chip U3 is, the brighter the LED light source 150 is.
When the voltage of the signal input end of the dimming chip U1 is lower, for example, 1V, the duty ratio of the PWM signal output end output by the signal output end is lower, the PWM signal is output to the second signal end of the rear-stage driving chip U3 from the fourth end of the first optocoupler, the rear-stage driving chip U3 is controlled by the PWM signal to reduce the output current of the driving output end and is in a low brightness state, the AC220V input is disconnected, the output voltages of the first diode D1 and the second diode D2 are rapidly reduced, the voltage of the output end of the third diode D3 is rapidly reduced because the output end of the third diode D3 does not store electric energy with a large capacitor, the first end of the second optocoupler U5 is not conducted with voltage, the internal light emitting diode is cut off, and the voltage of the output end of the constant voltage chip U4 cannot be supplied to the second signal end through the third end and the fourth end of the second optocoupler U5. The second signal end is pulled down to the ground through the second resistor R2, so that the driving output end of the rear-stage driving circuit 130 is closed, the LED light source 150 does not emit light after no current passes, at this time, the PWM signal of the second signal end is controlled by the second optocoupler U5 until the electric quantity in the first capacitor EC1 is exhausted, and no back flash phenomenon occurs before the next startup.
According to the flashback eliminating circuit provided by the utility model, the flashback preventing circuit 140 is arranged, the first power supply end of the flashback preventing circuit 140 is connected with the second power supply end to obtain electricity, the first control end is connected between the output end of the constant voltage chip U4 and the second signal end, and the signal of the second signal end is pulled down by the flashback preventing circuit 140, so that the post-stage driving circuit 130 is controlled to output a driving signal to eliminate the flashback phenomenon. The discomfort brought to the user due to the lamp back flash phenomenon is effectively avoided, and meanwhile, the user experience is improved.
Example 4:
In this embodiment, the present utility model provides a lamp, which includes an integrated circuit board and an LED light source 150, wherein the integrated circuit board is integrated with the flash back eliminating circuit of the above embodiments 1-3, and the integrated circuit board is electrically connected with the LED light source 150 through the flash back eliminating circuit. Specifically, the flashback eliminating circuit is integrated in an integrated circuit board of the lamp, the integrated circuit board can be located in a driving part of the lamp or a circuit board part of the whole lamp, the LED light source 150 is turned on and off through the flashback eliminating circuit, the dimming circuit 120 controls brightness adjustment of the lamp by receiving a dimming signal of 0-10V when the LED light source 150 is turned on, and the LED light source 150 is turned off to consume electric quantity of the first capacitor EC1 through the anti-flashback circuit 140 or draw down a signal of the second signal end, so that the rear driving circuit 130 is controlled to output a driving signal to eliminate a flashback phenomenon.
Example 5:
In this embodiment, the utility model provides a lighting system, which comprises a control terminal and the lamp of embodiment 4, wherein the control terminal is electrically connected with a driving power supply of the lamp, and/or the control terminal performs information interaction with the driving power supply. In this embodiment, the control terminal may be a conventional control panel (such as a mechanical switch panel), an intelligent control panel or a remote controller, and when the control terminal is a conventional control panel, the control terminal is electrically connected to the control unit of the lamp. When the control terminal is an intelligent control panel or a remote controller, the control unit is provided with a first wireless communication module, the control terminal is provided with a second wireless communication module, and the control terminal is electrically connected with the control unit and/or the first wireless communication module and the second wireless communication module perform information interaction. In addition, the control terminal can also be an intelligent mobile terminal (such as a mobile phone, a tablet personal computer, intelligent threading equipment and the like), and can also be an artificial intelligent robot. Therefore, through interaction of the control terminal and the lamp, intelligent adjustment of the lighting device can be realized, intelligent lighting functions of multiple scenes and multiple purposes are realized, the occurrence of a flash phenomenon is prevented after the lamp is closed, and user experience is improved.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present utility model, unless expressly stated or limited otherwise, a first feature may include first and second features directly contacting each other, either above or below a second feature, or through additional features contacting each other, rather than directly contacting each other. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.
While the utility model has been described in conjunction with the specific embodiments above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, all such alternatives, modifications, and variations are included within the spirit and scope of the following claims.
Claims (10)
1. A flashback cancellation circuit, comprising:
The front-stage constant voltage circuit is provided with a first input end, a first power end and a second power end, wherein the first input end is connected with an input mains supply, and the first power end is connected with the anode of the LED light source through a first diode;
the dimming circuit is connected with the second power supply end and is used for receiving a dimming signal and converting the dimming signal into a PWM signal, and the PWM signal is output through a first signal end of the dimming circuit;
the rear-stage driving circuit comprises a constant voltage chip, a rear-stage driving chip and a first capacitor, wherein the power input ends of the constant voltage chip and the rear-stage driving chip and the first capacitor are connected with the output end of a first diode to obtain electricity, the rear-stage driving chip is provided with a second signal end and a driving output end, the second signal end is connected with the first signal end and the output end of the constant voltage chip, and the driving output end is connected with the negative electrode of the LED light source;
The anti-back flash circuit is provided with a first power supply end and a first control end, the first power supply end is connected with the first power supply end or the second power supply end to obtain electricity, and the first control end is connected with the first capacitor or connected between the output end of the constant voltage chip and the second signal end so as to control the rear-stage driving circuit to output driving signals.
2. The flashback elimination circuit of claim 1, wherein the anti-flashback circuit includes a third diode, a third capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a triode,
The input end of the third diode is a first power supply end, the input end of the third diode is connected with the first power supply end, and the output end of the third diode is connected with the third capacitor, the base electrode of the triode, the fourth resistor and the sixth resistor through a seventh resistor;
The emitter of the triode is connected with a fifth resistor, and the collector of the triode is grounded, wherein the other end of the fifth resistor is a first control end, and the other end of the fifth resistor is connected with a first capacitor;
the other ends of the fourth resistor and the third capacitor are grounded, and the other end of the sixth resistor is connected with the output end of the first diode.
3. The flashback elimination circuit of claim 1, wherein the anti-flashback circuit includes a third diode, a fourth resistor, and a second optocoupler,
The input end of the third diode is a first power supply end, the input end of the third diode is connected with a second power supply end, and the output end of the third diode is connected with the first end of the second optocoupler through a fourth resistor;
The fourth end and the third end of the second optocoupler are first control ends, the fourth end is connected with the output end of the constant voltage chip, the third end is connected with the second signal end, and the second end is grounded.
4. The back flash elimination circuit according to claim 2 or 3, wherein the pre-stage constant voltage circuit comprises an AC-DC chip and a transformer,
The input end of the AC-DC chip is a first input end, and the output end of the AC-DC chip is connected with the transformer;
The first power end and the second power end are arranged on the transformer to output power supply.
5. The flashback elimination circuit of claim 4, wherein the dimming circuit comprises a dimming chip, a first optocoupler, a first resistor, and a second diode,
The input end of the second diode is connected with the second power supply end;
The dimming chip is provided with a signal input end, a signal output end and a second power supply end, the second power supply end is connected with the output end of the second diode, the signal input end is connected with external adjusting equipment, and the signal output end is connected with the second end of the first optical coupler;
The first end of the first optocoupler is connected with the output end of the second diode through a first resistor, the fourth end of the first optocoupler is a first signal end, PWM signals are output to the backward driving circuit, and the third end of the first optocoupler is grounded.
6. The flashback elimination circuit of claim 5, wherein the output terminal of the second diode is further connected to a second capacitor, and the other terminal of the second capacitor is grounded.
7. The flashback arrestor circuit of claim 6, wherein the signal input of the dimmer chip is configured to receive a dimming signal of 0-10V.
8. The back flash eliminating circuit according to claim 6, wherein the back stage driving circuit is further provided with a second resistor and a third resistor, the other end of the second resistor is grounded, the third resistor is connected between the output end of the constant voltage chip and the second signal end, or the third resistor is connected between the output end of the constant voltage chip and the first control end.
9. A lamp, comprising an integrated circuit board and an LED light source, wherein the integrated circuit board is integrated with the flashback arrestor circuit of any one of claims 1-8, and the integrated circuit board is electrically connected with the LED light source through the flashback arrestor circuit.
10. A lighting system comprising a control terminal, characterized in that:
the lighting system further comprising the luminaire of claim 9;
the control terminal is electrically connected with the driving power supply of the lamp, and/or
And the control terminal performs information interaction with the driving power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422187560.4U CN223093926U (en) | 2024-09-06 | 2024-09-06 | Flash eliminating circuit, lamp and lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422187560.4U CN223093926U (en) | 2024-09-06 | 2024-09-06 | Flash eliminating circuit, lamp and lighting system |
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| Publication Number | Publication Date |
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| CN223093926U true CN223093926U (en) | 2025-07-11 |
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| CN202422187560.4U Active CN223093926U (en) | 2024-09-06 | 2024-09-06 | Flash eliminating circuit, lamp and lighting system |
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| CN (1) | CN223093926U (en) |
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