CN216626125U

CN216626125U - Illumination driving circuit, illumination driving device and lamp

Info

Publication number: CN216626125U
Application number: CN202122694236.8U
Authority: CN
Inventors: 许阳彬; 李炎坤; 叶和木; 林起锵; 吴永强; 刘宗源
Original assignee: Leedarson Lighting Co Ltd
Current assignee: Leedarson Lighting Co Ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-05-27
Anticipated expiration: 2031-11-05

Abstract

The application belongs to the technical field of illumination, provides a lighting drive circuit, lighting drive device and lamps and lanterns, and lighting drive circuit includes: the lighting driving circuit comprises a rectifying module, a driving module, a first reference constant current switching module, a second reference constant current switching module and a harmonic control module, wherein the rectifying module is used for rectifying alternating current to generate direct current, the driving module is used for adjusting the direct current, the first reference constant current switching module is used for adjusting the color temperature of a first light source module, the second reference constant current switching module is used for adjusting the color temperature of a second light source module, the harmonic control module is used for monitoring the voltage and the current output by the first reference constant current switching module and adjusting the current flowing through the first light source module and the second light source module according to the monitoring voltage and the monitoring current, and the problems of complex circuit, long development period and low stability of the existing lighting driving circuit are solved by adopting the harmonic control module to adjust the current flowing through the first light source module and the second light source module.

Description

Illumination driving circuit, illumination driving device and lamp

Technical Field

The application belongs to the technical field of lighting, and particularly relates to a lighting driving circuit, a lighting driving device and a lamp.

Background

At present, light-emitting diode (LED) lighting technology is rapidly developed, and in order to accelerate the popularization of LED fluorescent tubes and LED down lamps, an LED lamp with a simple circuit, reliable performance and low price is urgently needed in the commercial market. In order to accurately obtain LED drivers with different brightness and color temperatures, for example, if color temperature switching of 5CCT is required and low harmonic requirements are simultaneously satisfied, a Micro Control Unit (MCU) is usually required to perform signal detection and logic operation processing, so as to output multiple PWM signals with different duty ratios for chopping color modulation at an output end.

However, the scheme of mixing colors of the light source through the MCU has the problems of complex circuit, long development period and low stability.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide an illumination drive circuit, illumination drive arrangement and lamps and lanterns, aim at solving the complicated, development cycle length of circuit, the lower problem of stability that current illumination drive circuit exists.

A first aspect of an embodiment of the present application provides an illumination driving circuit, which is connected to a first light source module and a second light source module, and includes:

the rectification module is connected with the first light source module and used for accessing alternating current and rectifying the alternating current to generate direct current to supply power to the first light source module;

the driving module is connected with the rectifying module and used for adjusting the direct current;

the first reference constant current switching module is connected with the first light source module and the driving module and used for adjusting the color temperature of the first light source module according to the received first switching signal;

the second reference constant current switching module is connected with the second light source module, the first reference constant current switching module and the driving module and is used for adjusting the color temperature of the second light source module according to a received second switching signal;

and the harmonic control module is connected with the first reference constant current switching module and used for monitoring the voltage and the current output by the first reference constant current switching module, generating a monitoring voltage and a monitoring current and regulating the current flowing through the first light source module and the second light source module according to the monitoring voltage and the monitoring current.

In one embodiment, the first reference constant current switching module includes:

the light emitting units of different color temperatures of the first light source module are connected with the collectors of the first common base electrode triode unit in a one-to-one correspondence mode;

the first voltage division and filtering unit is connected with the rectifying module and is used for carrying out voltage division and filtering processing on the direct current and providing a first working voltage for the first light source module;

and the first switching unit is connected with the first common base electrode triode unit and used for adjusting the current proportion in the multiple paths of light-emitting units according to the first switching signal so as to adjust the color temperature of the first light source module.

In one embodiment, the first light source module comprises a first light emitting unit and a second light emitting unit, an input end of the first light emitting unit and an input end of the second light emitting unit are connected to the rectifying module in common, and a color temperature of the first light emitting unit is different from a color temperature of the second light emitting unit;

the first common base triode unit comprises: first triode, second triode, first resistance and second resistance, the collecting electrode of first triode with the output of first luminescence unit is connected, the collecting electrode of second triode with the output of second luminescence unit is connected, the base of first triode with the base of second triode connect in the first end of first resistance altogether, the second end of first resistance with the input of first luminescence unit is connected, the projecting pole of first triode with first switching unit connects, the projecting pole of second triode with the first end of second resistance is connected, the second end of second resistance with second light source module connects.

In one embodiment, the first switching unit includes: a single-pole multi-throw switch, a plurality of switching resistors;

the fixed end of the single-pole multi-throw switch is connected with the emitting electrode of the first triode, a plurality of movable ends of the single-pole multi-throw switch are respectively connected with the first ends of the plurality of switching resistors in a one-to-one correspondence mode, and the second ends of the plurality of switching resistors are connected to the second light source module in a shared mode.

In one embodiment, the first voltage division and filter unit comprises at least one voltage division resistor and at least one filter capacitor;

the first end of the at least one divider resistor and the first end of the at least one filter capacitor are connected to the input end of the first light source module in a shared manner, and the second end of the at least one divider resistor and the second end of the at least one filter capacitor are connected to the input end of the second light source module in a shared manner.

In one embodiment, the second reference constant current switching module includes:

the multiple collectors of the second common base electrode triode unit are connected with the multiple paths of light-emitting units with different color temperatures of the second light source module in a one-to-one correspondence mode;

the second voltage division and filtering unit is connected with the first reference constant current switching module and is used for performing voltage division and filtering processing on the voltage output by the first reference constant current switching module and providing a second working voltage for the second light source module;

and the second switching unit and the second common base electrode triode unit are used for adjusting the current proportion in the multiple paths of light-emitting units according to the second switching signal so as to adjust the color temperature of the second light source module.

In one embodiment, the lighting driving circuit further comprises:

the first backflow prevention module is arranged between the first reference constant current switching module and the rectification module and used for preventing the current of the first reference constant current switching module from flowing backwards into the rectification module.

In one embodiment, the lighting driving circuit further comprises:

the second backflow prevention module is arranged between the first reference constant current switching module and the second reference constant current switching module and used for preventing the current of the second reference constant current switching module from flowing backwards to the first reference constant current switching module.

A second aspect of embodiments of the present application provides an illumination driving apparatus including the illumination driving circuit as described in any one of the above.

A third aspect of the embodiments of the present application provides a luminaire, including: a first light source module; a second light source module; and the lighting driving circuit is connected with the first light source module and the second light source module respectively.

The embodiment of the application provides a lighting drive circuit, lighting drive device and lamps and lanterns, and lighting drive circuit includes: the lighting device comprises a rectifying module, a driving module, a first reference constant current switching module, a second reference constant current switching module and a harmonic control module, wherein the rectifying module is used for accessing alternating current and rectifying the alternating current to generate direct current to supply power for the first light source module, the driving module is used for adjusting the direct current, the first reference constant current switching module is used for adjusting the color temperature of the first light source module according to a received first switching signal, the second reference constant current switching module is used for adjusting the color temperature of the second light source module according to a received second switching signal, the harmonic control module is used for monitoring the voltage and current output by the first reference constant current switching module to generate monitoring voltage and monitoring current, and adjusting the current flowing through the first light source module and the second light source module according to the monitoring voltage and the monitoring current, and the current flowing through the first light source module and the second light source module is adjusted by adopting the harmonic control module to monitor the voltage and the monitoring current, so that the existing lighting driving electric current is solved The circuit has the problems of complex circuit, long development period and low stability.

Drawings

Fig. 1 is a schematic structural diagram of an illumination driving circuit provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of an illumination driving circuit according to another embodiment of the present application;

fig. 3 is a schematic structural diagram of an illumination driving circuit according to another embodiment of the present application.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the drawings described above, are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.

In order to enable the LED to drive and accurately control the light source module to obtain different brightness and color temperature, the MCU is generally required to be adopted for signal detection and logic operation processing, and multiple paths of PWM signals with different duty ratios are output to carry out chopping and color mixing of the output end.

In order to solve the above technical problem, an embodiment of the present application provides an illumination driving circuit, wherein the illumination driving circuit is connected to a first light source module 20 and a second light source module 40, and as shown in fig. 1, the illumination driving circuit includes: the circuit comprises a rectifying module 10, a driving module 60, a first reference constant current switching module 30, a second reference constant current switching module 50 and a harmonic control module 70.

In this embodiment, referring to fig. 1, the rectifying module 10 is connected to the first light source module 20, and is configured to access ac power and rectify the ac power to generate dc power to supply power to the first light source module 20, the driving module 60 is connected to the rectifying module 10 and is configured to adjust the dc power, the first reference constant current switching module 30 is connected to the first light source module 20 and the driving module 60 and is configured to adjust a color temperature of the first light source module 20 according to a received first switching signal, the second reference constant current switching module 50 is connected to the second light source module 40, the first reference constant current switching module 30 and the driving module 60 and is configured to adjust the color temperature of the second light source module 40 according to a received second switching signal, the harmonic control module 70 is connected to the first reference constant current switching module 30 and is configured to monitor a voltage and a current output by the first reference constant current switching module 30, a monitoring voltage and a monitoring current are generated, and the current flowing through the first and second

light source modules

20 and 40 is adjusted according to the monitoring voltage and the monitoring current.

Specifically, in this embodiment, when the first light source module 20 and the second light source module 40 need to emit light for working, the rectifier module 10 is connected to an external power source, rectifies the connected ac power to generate a dc power, and supplies power to the first light source module 20 and the second light source module 40, and the first light source module 20 and the second light source module 40 are connected in sequence.

Further, the driving module 60 is connected to the rectifying module 10, and the driving module 60 adjusts the magnitude of the direct current according to the current output by the light source module to generate a voltage suitable for the first light source module 20 to operate, thereby completing the driving control of the first light source module 20 and the second light source module 40.

Further, referring to fig. 1, after the first reference constant current switching module 30 is powered on, the color temperature of the first light source module 20 is adjusted according to the received first switching signal, the first light source module 20 emits lights with different brightness and the like according to different first switching signals to meet the requirements of different environments and the application requirements of different scenes, and so on, the second reference constant current switching module 50 is connected with the second light source module 40, the first reference constant current switching module 30 and the driving module 60, the color temperature of the second light source module 40 is adjusted according to the received second switching signal, the second light source module 40 emits lights with different brightness and the like according to different second switching signals to meet the requirements of different environments and the application requirements of different scenes, wherein the first light source module 20 and the second light source module 40 can emit lights with different color temperatures at the same time, and are not related to each other, the lighting driving circuits work independently, and application scenes of the lighting driving circuits are increased.

In a specific application, the first switching signal and the second switching signal may be user input signals, for example, switching signals input by a user by toggling a switch.

In the present embodiment, referring to fig. 1, the harmonic control module 70 is connected to the first reference constant current switching module 30, monitors the voltage and current output by the first reference constant current switching module 30, generates a monitored voltage and a monitored current, and adjusts the current flowing through the first and second

light source modules

20 and 40 according to the monitored voltage and current, and in particular, the harmonic control module 70 controls the color temperatures of the first and second

light source modules

20 and 40 by monitoring the voltage and current output from the first reference constant current switching module 30, so that the first light source module 20 and the second light source module 40 can emit lights with different brightness at the same time without affecting each other, meet the requirements of different scenes, and the circuit structure of the existing lighting driving circuit is simplified, so that the lighting driving circuit is relatively stable, the service life is prolonged, and the cost is saved.

In one embodiment, referring to fig. 2, the first reference constant current switching module 30 includes: a first common base triode unit 31, a first voltage division and wave filtering unit 33 and a first switching unit 32.

Specifically, a plurality of collectors of the first common base electrode triode unit 31 are connected with the plurality of paths of light emitting units of the first light source module 20 with different color temperatures in a one-to-one correspondence manner, the first voltage division filtering unit 33 is connected with the rectifying module 10 and used for performing direct current voltage division filtering processing to provide a first working voltage for the first light source module 20, and the first switching unit 32 is connected with the first common base electrode triode unit 31 and used for adjusting the current proportion in the plurality of paths of light emitting units according to a first switching signal to adjust the color temperature of the first light source module 20.

In this embodiment, referring to fig. 2, the base triode has the characteristics of large input impedance and small output impedance, and mainly plays a role of isolation, so that the mutual influence between the front-stage circuit and the rear-stage circuit of the base triode can be minimized, the base triode has the advantages of high voltage gain, excellent high-frequency characteristics, and the like, a plurality of collectors of the first common base triode unit 31 are connected with the multiple paths of light emitting units of different color temperatures of the first light source module 20 in a one-to-one correspondence manner, and can amplify different multiples of voltage and current according to different switching signals, so that the first light source module 20 can emit different color temperatures, the first voltage division filtering unit 33 is used for dc voltage division filtering, and when devices in the circuit work, noise of different frequencies can be generated, and the working efficiency of the circuit is affected.

In one embodiment, the first filter-press filtering unit 33 can effectively filter a frequency point of a designated frequency in the circuit or frequencies other than the frequency point to obtain a signal of a useful frequency or a signal of a useless frequency, the first filter-press filtering unit 33 can separate a single frequency component from complex frequency components, and the first filter-press filtering unit 33 can also isolate the useful signal from the useless noise in the circuit, so that the interference resistance and the signal-to-noise ratio of the circuit signal are improved, the analysis accuracy of the circuit is further improved, the circuit structure of the existing lighting driving circuit is simplified, and the lighting driving circuit is relatively stable.

In this embodiment, the first switching unit 32 is connected to the first common base triode unit 31 and configured to adjust a current ratio in the multi-channel light emitting unit according to a first switching signal to adjust a color temperature of the first light source module 20, specifically, the first switching unit 32 can perform at least five switching operations with different color temperatures, and after the first switching signal sends different switching instructions, the first switching unit 32 performs different switching operations according to different switching signals, so that the first light source module 20 sends different lights.

In one embodiment, referring to fig. 3, the first light source module 20 may include a plurality of light emitting units, for example, in fig. 3, the first light source module 20 includes a first light emitting unit 21 and a second light emitting unit 22, an input end of the first light emitting unit 21 and an input end of the second light emitting unit 22 are connected to the rectifier module 10 in common, and a color temperature of the first light emitting unit 21 is different from a color temperature of the second light emitting unit 22.

Specifically, in this embodiment, the first light-emitting unit 21 includes N LED lamps connected in series, and the second light-emitting unit 22 includes M LED lamps connected in series, where N and M may be the same or different, so that the first light-emitting unit 21 and the second light-emitting unit 22 may emit different color temperatures at the same time, so that the first light-emitting unit 21 and the second light-emitting unit 22 are independent of each other and do not interfere with each other, the color temperature types of the first light source module 20 are increased, the application requirements of different scenes of the first light source module 20 are met, and the circuit structure of the existing lighting driving circuit is simplified, so that the lighting driving circuit is relatively stable, the service life is prolonged, and the cost is saved.

In this embodiment, referring to fig. 3, the first common base triode unit 31 includes: the light source module comprises a first triode Q1, a second triode Q2, a first resistor R1 and a second resistor R2, wherein a collector of the first triode Q1 is connected with an output end of the first light-emitting unit 21, a collector of the second triode Q2 is connected with an output end of the second light-emitting unit 22, a base of the first triode Q1 and a base of the second triode Q2 are commonly connected with a first end of the first resistor R1, a second end of the first resistor R1 is connected with an input end of the first light-emitting unit 21, an emitter of the first triode Q1 is connected with the first switching unit 32, an emitter of the second triode Q2 is connected with a first end of the second resistor R2, and a second end of the second resistor R2 is connected with the second light source module 40.

In this embodiment, the first transistor Q1 and the second transistor Q2 form a common-base common-collector transistor circuit, which has a function of amplifying current, the first transistor Q1 and the second transistor Q2 control a larger variation of collector current by a small variation of base current to achieve a current amplification function, wherein the first transistor Q1 is used to control current flowing through the first light emitting unit 21, the second transistor Q2 is used to control current flowing through the second light emitting unit 22, the current ratio of the first light emitting unit 21 and the second light emitting unit 22 can be adjusted by adjusting the current of the emitters of the first transistor Q1 and the second transistor Q2, so that the first light emitting unit 21 and the second light emitting unit 22 can emit different color temperatures at the same time, and the first light emitting unit 21 and the second light emitting unit 22 are independent of each other and do not interfere with each other, and the type of the first light source module 20 is increased, the application requirements of different scenes of the first light source module 20 are met.

In one embodiment, the first transistor Q1 and the second transistor Q2 are NPN transistors.

In one embodiment, the first switching unit 32 includes: single-pole multi-throw switch, multiple switch resistance.

In this embodiment, the resistance values of the plurality of switching resistors are different from each other, the stationary end of the single-pole multi-throw switch is connected to the emitter of the first triode Q1, the plurality of moving ends of the single-pole multi-throw switch are respectively connected to the first ends of the plurality of switching resistors in a one-to-one correspondence, and the second ends of the plurality of switching resistors are connected to the second light source module 40 in common, specifically, the color temperature of the first light source module 20 is switched by switching the connection states of the plurality of moving ends of the single-pole multi-throw switch and different resistors, when the moving end of the single-pole multi-throw switch is switched to the first switching resistor, the first light source module 20 emits light of a first color temperature, when the moving end of the single-pole multi-throw switch is switched to the second switching resistor, the first light source module 20 emits light of a second color temperature, and so on, when the moving end of the single-pole multi-throw switch is switched to the fifth switching resistor, the first light source module 20 emits light of a fifth color temperature, the first light source module 20 can emit different color temperatures, and the application requirements of different scenes of the first light source module 20 are met.

In one embodiment, referring to fig. 3, the first switching unit 32 includes: a first single-pole-multiple-throw switch SW1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7.

The third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7 are used as switching resistors and are respectively connected to the plurality of moving ends of the first single-pole multi-throw switch SW1 in a one-to-one correspondence manner, the first single-pole multi-throw switch SW1 selects the corresponding switching resistor to be connected to the emitter of the second triode according to the first switching signal, wherein the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7 have different resistance values, and according to the resistance values of the resistors connected to the emitter of the second triode, the current ratio between the first light-emitting unit 21 and the second light-emitting unit 22 can be adjusted, so as to adjust the color temperature of the first light source module 32.

In one embodiment, the first voltage dividing and filtering unit 33 includes at least one voltage dividing resistor and at least one filtering capacitor.

In this embodiment, at least one voltage dividing resistor and at least one filter capacitor may be arranged in parallel.

Specifically, referring to fig. 3, the at least one voltage dividing resistor may be an eighth resistor R8, and the at least one filter capacitor may be a first capacitor C1.

The first end of the eighth resistor R8 and the first end of the first capacitor C1 are commonly connected to the input end of the first light source module 20, the second end of the eighth resistor R8 and the second end of the first capacitor C1 are commonly connected to the input end of the second light source module 40, specifically, under the condition that the total voltage is not changed, the eighth resistor R8 can perform a voltage division function, and the voltage across the circuit after the first light source module and the first reference constant current switching module are connected in series is the same as the voltage across the eighth resistor R8. If the eighth resistor R8 is an adjustable resistor, the voltage across the first light source module can be adjusted by adjusting the eighth resistor R8.

The first capacitor C1 can effectively filter the frequency point of the designated frequency or frequencies except the frequency point in the circuit to obtain a signal of useful frequency or a signal of useless frequency, the first capacitor C1 can separate a single frequency component from complex frequency components, and the first capacitor C1 can also isolate the useful signal from the useless noise in the circuit, so that the anti-interference performance and the signal-to-noise ratio of the circuit signal are improved, the analysis accuracy of the circuit is further improved by the first voltage division and filtering unit 33, the stability of the circuit is increased, and the service life of the circuit is prolonged.

In one embodiment, referring to fig. 2, the second reference constant current switching module 50 includes: a second common base triode unit 51, a second voltage division and wave filtering unit 53 and a second switching unit 52.

In this embodiment, the second common base triode unit 51, a plurality of collectors of the second common base triode unit 51 are connected with the plurality of light emitting units of the second light source module 40 with different color temperatures in a one-to-one correspondence manner, the second voltage division filtering unit 53 is connected with the first reference constant current switching module 30 and is configured to perform voltage division filtering processing on the voltage output by the first reference constant current switching module 30 and provide a second working voltage for the second light source module 40, and the second switching unit 52 is connected with the second common base triode unit 51 and is configured to adjust a current ratio in the plurality of light emitting units according to the second switching signal so as to adjust the color temperature of the second light source module 40.

In this embodiment, referring to fig. 2, a plurality of collectors of the second common base triode unit 51 are connected to the multiple light emitting units of the second light source module 40 with different color temperatures in a one-to-one correspondence manner, and can amplify different multiples of voltage and current according to different switching signals, so that the second light source module 40 can emit different color temperatures, the second voltage division filtering unit 53 is used for dc voltage division filtering processing, when each component in the circuit operates, noise with different frequencies can be generated, which affects the operating efficiency of the circuit, the second voltage division filtering unit 53 can effectively filter a frequency point with a specified frequency in the circuit or frequencies other than the frequency point, so as to obtain a signal with a useful frequency or a signal with a useless frequency, and the second voltage division filtering unit 53 can separate a single frequency component from complex frequency components, the second voltage division and filtering unit 53 can also isolate useful signals from useless noise in the circuit, thereby improving the anti-interference performance and signal-to-noise ratio of circuit signals, further improving the analysis accuracy of the circuit, and simplifying the circuit structure of the existing lighting driving circuit, so that the lighting driving circuit is relatively stable, in this embodiment, the second switching unit 52 is connected with the second common base triode unit 51, and is used for adjusting the current proportion in the multi-path light-emitting unit according to the second switching signal, so as to adjust the color temperature of the second light source module 40, specifically, the second switching unit 52 can perform at least five different color temperature switching, after the second switching signal sends different switching instructions, the first switching unit 32 performs different switching according to different switching signals, so that the second light source module 40 sends different lights, and the first light source module 20 and the second light source module 40 send different color temperature lights, the problems of complex circuit, long development period and low stability of the existing lighting driving circuit are solved, and the application scenes of the lighting driving circuit are increased.

In one embodiment, referring to fig. 3, the second light source module 40 may include a plurality of light emitting units, for example, in fig. 3, the second light source module 40 includes a third light emitting unit 41 and a fourth light emitting unit 42, an input end of the third light emitting unit 41 and an input end of the fourth light emitting unit 42 are commonly connected to the rectifying module 10, and a color temperature of the third light emitting unit 41 is different from a color temperature of the fourth light emitting unit 42.

Specifically, in this embodiment, the third light emitting unit 41 includes N LED lamps connected in series, the fourth light emitting unit 42 includes M LED lamps connected in series, where N and M may be the same or different, so that the third light emitting unit 41 and the fourth light emitting unit 42 can emit different color temperatures at the same time, the third light emitting unit 41 and the fourth light emitting unit 42 are independent of each other and do not interfere with each other, the color temperature type of the second light source module 40 is increased, the application requirements of different scenes of the second light source module 40 are met, and the circuit structure of the existing lighting driving circuit is simplified, so that the lighting driving circuit is relatively stable, the service life is prolonged, and the cost is saved.

In this embodiment, referring to fig. 3, the second common base triode unit 51 includes: a third transistor Q3, a fourth transistor Q4, a tenth resistor R10, and an eleventh resistor R11.

A collector of the third transistor Q3 is connected to an output terminal of the third light emitting unit 41, a collector of the fourth transistor Q4 is connected to an output terminal of the fourth light emitting unit 42, a base of the third transistor Q3 and a base of the fourth transistor Q4 are commonly connected to a first end of an eleventh resistor R11, and a second end of the eleventh resistor R11 is connected to an input terminal of the second light source module 40.

An emitter of the third transistor Q3 is connected to a first terminal of the tenth resistor R10, and an emitter of the fourth transistor Q4 is connected to the first switching unit 32.

In this embodiment, the third transistor Q3 and the fourth transistor Q4 form a common base common collector transistor circuit, which has a function of amplifying current, the third transistor Q3 and the fourth transistor Q4 control the variation of larger collector current by the slight variation of base current, so as to realize the current amplification, wherein the third transistor Q3 is used to control the current flowing through the third light emitting unit 41, the fourth transistor Q4 is used to control the current flowing through the fourth light emitting unit 42, the current ratio of the third light emitting unit 41 and the fourth light emitting unit 42 can be adjusted by adjusting the current of the emitters of the third transistor Q3 and the fourth transistor Q4, so that the third light emitting unit 41 and the fourth light emitting unit 42 can emit different color temperatures at the same time, and the third light emitting unit 41 and the fourth light emitting unit 42 are independent from each other and do not interfere with each other, and the color temperature type of the second light source module 40 is increased, the application requirements of different scenes of the second light source module 40 are met.

In one embodiment, the third transistor Q3 and the fourth transistor Q4 are NPN transistors.

In one embodiment, the second switching unit 52 includes: single-pole multi-throw switch, multiple switch resistance.

In this embodiment, the resistance values of the plurality of switching resistors are different from each other, the stationary end of the single-pole multi-throw switch is connected to the emitter of the fourth triode Q4, the plurality of moving ends of the single-pole multi-throw switch are respectively connected to the first ends of the plurality of switching resistors in a one-to-one correspondence, the second ends of the plurality of switching resistors are connected to the second light source module 40 in common, specifically, the color temperature of the second light source module 40 is switched by switching the connection states of the plurality of moving ends of the single-pole multi-throw switch and different resistors, when the moving end of the single-pole multi-throw switch is switched to the first switching resistor, the second light source module 40 emits light of the first color temperature, when the moving end of the single-pole multi-throw switch is switched to the second switching resistor, the second light source module 40 emits light of the second color temperature, and so on, when the moving end of the single-pole multi-throw switch is switched to the fifth switching resistor, the second light source module 40 emits light of the fifth color temperature, the second light source module 40 can emit different color temperatures, and the application requirements of different scenes of the second light source module 40 are met.

In one embodiment, referring to fig. 3, the second switching unit 52 includes: a second single-pole-multiple-throw switch SW2, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17.

A thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17 are used as switching resistors and are respectively connected to the plurality of moving ends of the second single-pole multi-throw switch SW2 in a one-to-one correspondence manner, the second single-pole multi-throw switch SW2 selects the corresponding switching resistor to be connected to the emitter of the fourth triode Q4 according to a second switching signal, wherein the resistances of the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, and the seventeenth resistor R17 are different, and the current ratio between the third light-emitting unit 41 and the fourth light-emitting unit 42 can be adjusted according to the resistance of the resistor connected to the emitter of the fourth triode Q4, so as to adjust the color temperature of the second light source module 40.

In one embodiment, the second voltage dividing and filtering unit 53 includes at least one voltage dividing resistor and at least one filtering capacitor.

Specifically, referring to fig. 3, the at least one voltage dividing resistor may be a twelfth resistor R12, and the at least one filter capacitor may be a second capacitor C2.

A first end of the twelfth resistor R12 and a first end of the second capacitor C2 are commonly connected to the input terminal of the second light source module 40, and a second end of the twelfth resistor R12 and a second end of the second capacitor C2 are commonly connected to the common ground terminal SGND.

In one embodiment, the common ground terminal SGND may be grounded through a filter capacitor.

In one embodiment, referring to fig. 3, the lighting driving circuit further includes a first backflow prevention module 81.

In this embodiment, the first backflow prevention module 81 is disposed between the first reference constant current switching module 30 and the rectifier module 10, and is configured to prevent the current of the first reference constant current switching module 30 from flowing backward into the rectifier module 10.

Referring to fig. 3, the first anti-backflow module may be an anti-backflow diode D1, the anti-backflow diode D1 is an electronic device made of a semiconductor material (silicon, selenium, germanium, or the like), and has a one-way conductivity, that is, when a forward voltage is applied to the anode and the cathode of the diode, the diode is turned on, and when a reverse voltage is applied to the anode and the cathode, the diode is turned off, so that the on and off of the diode is equivalent to the on and off of the switch, and the current of the first reference constant current switching module 30 can be prevented from flowing backward into the rectifying module 10, thereby increasing the stability of the lighting driving circuit.

In one embodiment, as shown with reference to fig. 3, the lighting driving circuit further includes a second backflow prevention module 82.

In this embodiment, the second backflow prevention module 82 is disposed between the first reference constant current switching module 30 and the second reference constant current switching module 50, and is configured to prevent the current of the second reference constant current switching module 50 from flowing backwards to the first reference constant current switching module 30.

In an embodiment, referring to fig. 3, the second backflow prevention module 82 may be a backflow prevention diode D2, or may be a switch formed by connecting MOS transistors to achieve the purpose of preventing current backflow, so as to effectively solve the abnormal backflow phenomenon of the electrical equipment encountered in low voltage, and avoid damaging the electrical equipment.

In one embodiment, referring to fig. 3, the harmonic control module includes a harmonic control chip U2, a third diode D3, an eighteenth resistor R18, and a third capacitor C3.

Specifically, the pin D of the harmonic control chip U2 and the cathode of the third diode D3 are commonly connected to the input end of the second light source module 40, the pin G of the harmonic control chip U2, the anode of the third diode D3 and the first end of the third capacitor C3 are commonly connected to the ground, the second end of the third capacitor C3 is connected to the common ground terminal SGND, the pin EX of the harmonic control chip U2 is connected to the first end of the eighteenth resistor R18, and the second end of the eighteenth resistor R18 is connected to the driving module 60.

In one embodiment, the harmonic control chip U2 may be a harmonic controller, or a harmonic controller based on the DSP chip TMS32LF 2407.

In one embodiment, as shown with reference to fig. 3, the driving module 60 includes: the driving circuit comprises a driving chip U1, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21 and a twenty-second resistor R22.

Specifically, a power supply pin VCC of the driving chip U1 and a first end of the sixth capacitor C6 are commonly connected to a power supply terminal, a ground pin GND of the driving chip U1 and a second end of the sixth capacitor C6, a first end of the twentieth resistor R20, a first end of the fifth capacitor C5, a first end of the fourth capacitor C4 and a first end of the nineteenth resistor R19 are commonly connected to ground, a pin VS of the driving chip U1 and a second end of the twentieth resistor R20 are connected, a pin CF of the driving chip U1 and a second end of the fifth capacitor C5 are connected, a pin COMP of the driving chip U1 and a second end of the fourth capacitor C4 and a second end of the nineteenth resistor R19 are commonly connected, a pin PVIN of the driving chip U1 and a common ground terminal are connected, a pin IBLE of the driving chip U1 and a first end of the twenty-second resistor R22 are connected, a pin CB of the driving chip U1 and a pin 8 of the eighth capacitor C8, and a pin CF 8 of the driving chip U2 are connected to a first end of the eighth capacitor C1 and a common ground terminal 2, The first end of the seventh capacitor C7 and the first end of the twenty-first resistor R21 are connected in common, the second end of the twenty-first resistor R21, the second end of the seventh capacitor C7 and the second end of the eighth capacitor C8 are connected in common to ground, and the second end of the twenty-second resistor R22 is connected to the output end of the rectifier module 10.

In one embodiment, the commercial power is rectified and then output to the light source module, so that the light source module works, and then enters the chip through the pin PVIN of the driving chip, the driving chip controls the current passing through the light source module through the switching time of the internal MOS transistor, and the current of the light source module is connected to form a loop through the pin VS of the driving chip and the fifth resistor R5.

In one embodiment, the pin VS of the driving chip is connected to a comparator inside the chip, and the voltage across the fifth resistor R5 is compared with the reference voltage (Uref) inside the driving chip to control the switching time of the MOS transistor inside the driving chip, so as to achieve the constant current of the light source module.

The pin CF2 of the driving chip samples the voltages of the twenty-first resistor R21 and the seventh capacitor C7, and compares and judges whether the silicon controlled rectifier dimming exists in the circuit. The fifth capacitor C5 connected to the pin CF of the driving chip and the internal comparator of the driving chip form an integrated circuit, so that the internal reference voltage (Uref) of the chip is changed, and the higher the voltage on the fifth capacitor C5 is, the higher the Uref is, so that the current of the light source module is changed, and the dimming effect is realized.

In one embodiment, the driver chip U1 may be of a model number LT3942, BD9883, or the like.

In one embodiment, referring to fig. 3, the rectifier module 10 includes a rectifier bridge BD, a voltage dependent resistor RV, and a fuse F1.

Specifically, the first input end of rectifier bridge BD is connected with zero line N, and the second input end of rectifier bridge BD is connected with the first end of fuse F1, and the second end of fuse F1 is connected with live wire L, and the first output end of rectifier bridge BD and the first end of piezo-resistor RV connect in drive module altogether, and the second output end of rectifier bridge BD and the second end of piezo-resistor RV connect in ground altogether.

In one embodiment, referring to fig. 3, the lighting driving circuit further includes a twenty-third resistor R23, a first end of the twenty-third resistor R23 is connected to the input end of the second light source module 40, and a second end of the twenty-third resistor R23 is connected to the power supply terminal VCC, for supplying power to the driving chip U1.

The embodiment of the application also provides an illumination driving device, which comprises the illumination driving circuit.

The embodiment of the present application further provides a lamp, which includes a first light source module 20, a second light source module 40, and the lighting driving circuit described in any one of the above, where the lighting driving circuit is connected to the first light source module 20 and the second light source module 40, respectively.

The embodiment of the application provides a lighting driving circuit, a power driving circuit and a lamp, a power switch module is arranged between a direct current power supply end and a driving chip U1, a filtering module carries out filtering processing on a voltage signal of a high-voltage starting pin of the driving chip U1, the power switch module controls the connection relation between the high-voltage starting pin of the driving chip U1 and the direct current power supply end, a switch control module generates a switch control signal according to direct current provided by the direct current power supply end, the switch state of the power switch module is controlled, the driving chip U1 cuts off the power connection of the high-voltage starting pin when the voltage of the high-voltage starting pin reaches a preset voltage and switches to an internal power supply pin of the driving chip U1 for supplying power, so that the lighting driving circuit is cut off to continuously work after the driving chip U1 normally works, and the internal low-voltage power supply of the driving chip U1 is realized, the loss that can effectual reduction illumination drive circuit continuous operation brought improves driven efficiency.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.

In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. An illumination driving circuit connected to a first light source module and a second light source module, the illumination driving circuit comprising:

2. The lighting driving circuit according to claim 1, wherein the first reference constant current switching module includes:

3. The lighting driving circuit according to claim 2, wherein the first light source module includes a first light emitting unit and a second light emitting unit, an input terminal of the first light emitting unit and an input terminal of the second light emitting unit are commonly connected to the rectifying module, and a color temperature of the first light emitting unit is different from a color temperature of the second light emitting unit;

4. The lighting driving circuit according to claim 3, wherein the first switching unit includes: a single-pole multi-throw switch, a plurality of switching resistors;

5. The lighting driving circuit according to claim 2, wherein the first voltage division filter unit comprises at least one voltage division resistor and at least one filter capacitor;

6. The lighting driving circuit according to claim 1, wherein the second reference constant current switching module includes:

7. The lighting driving circuit according to claim 1, wherein the lighting driving circuit further comprises:

8. The lighting driving circuit according to claim 7, wherein the lighting driving circuit further comprises:

9. A lighting driving device characterized by comprising the lighting driving circuit according to any one of claims 1 to 8.

10. A light fixture, comprising: a first light source module; a second light source module; and an illumination driving circuit according to any one of claims 1 to 8, the illumination driving circuit being connected to the first light source module and the second light source module, respectively.