CN210986496U

CN210986496U - Switch sectional color-adjusting light-adjusting constant-current controller integrated circuit, device and lamp

Info

Publication number: CN210986496U
Application number: CN201921970962.4U
Authority: CN
Inventors: 许瑞清; 刘立国
Original assignee: Beijing Modian Semiconductor Co ltd
Current assignee: Beijing Modian Semiconductor Co ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-07-10
Anticipated expiration: 2029-11-15

Abstract

The utility model discloses a switch segmentation mixing of colors constant current controller integrated circuit that adjusts luminance, its inside mixing of colors dimming control circuit, first, two NMOS pipes and constant current control circuit that is equipped with, the utility model discloses a controller integrated circuit has realized that constant current controller and colour temperature controller's reference ground and integration altogether can make L ED load full load work under the condition of neutral color, realizes segmentation mixing of colors and segmentation dimming simultaneously, compare with the popular scheme on the existing market, the utility model discloses the cost is lower, and the performance is more excellent.

Description

Switch sectional color-adjusting light-adjusting constant-current controller integrated circuit, device and lamp

Technical Field

The utility model relates to a constant current controller particularly, relates to a switch segmentation mixing of colors constant current controller integrated circuit that adjusts luminance, contains integrated circuit's constant current source load drive arrangement, and contain drive arrangement's intelligent illumination lamps and lanterns.

Background

Unlike other lighting fixtures, L ED fixture is well suited for smart dimming and color tuning, such as switch segment dimming and switch segment dimming, wireless remote control dimming and color tuning.

The function of the switch for the segmented color mixing is that the color temperature of the lamp is controlled by turning on and off the L ED lamp, the color temperature of the L ED light source is expressed by absolute temperature K, the color temperature is below 3300K, the light color is red and gives warm feeling to people, the light is generally called warm light or warm light, the color temperature is between 3000K and 6000K, the color tone has no particularly obvious visual psychological effect to people, the color temperature is refreshing and is called neutral color temperature, the light is called neutral light, the color temperature is above 6000K, the light color is blue and is given cool feeling, the light is called cold light or cold light, for example, the complete process of color mixing of the three-segment switch can be that the lamp is turned on for the first time, the L lamp is turned on by the cold light, the lamp is turned off, the lamp is turned on again within 5 seconds, the lamp is turned off again, the color temperature is changed to neutral light within L, the color temperature is changed again and is turned off again, the lamp is turned on again, the color temperature is changed within L, and is changed to be turned off no matter of course, the lamp is changed within 5 seconds, the lamp is made into the state of course, the cold light is made into the cold light, the color temperature of the lamp is changed, the lamp is changed again, the lamp is changed to be changed.

For example, a complete three-segment switch dimming process is described as turning on the L ED lamp at 10W for the first time, turning off the lamp to turn off the lamp, turning on the lamp again within 5 seconds to turn on the lamp again to reduce the brightness by half, thus saving energy by half, turning off the lamp to turn off the lamp again to turn on the lamp again within 5 seconds to change the brightness of the lamp to 2.5W, thus saving energy by only 1/4, turning off the lamp 3/4 for the third time, turning off the lamp again within 5 seconds to turn on the lamp again to change the brightness to 10W, thus achieving the maximum brightness, and similarly, the switch dimming can be made into three segments, and can also be made into any other segments, such as two segments, four segments, five segments, six segments, and even electrodeless dimming.

The segmented dimming technique is firstly applied, but is only applied to small-scale commercial use now, the segmented color-mixing technique applied to the latter invention is rapidly applied to large-scale commercial use, referring to fig. 1, fig. 1 is a L ED segmented color-mixing circuit which is the latest market at present, in the scheme, a constant-current circuit with a constant-current controller 200 as a core provides stable output current for a L ED load, a color temperature controller 100 is used for realizing selection of L ED color temperature,

L ED loads

005 and 006, one path is warm color, namely warm color, and the other path is cold color, namely cold color.

Disclosure of Invention

The utility model aims at, to the above problem that L ED segmentation mixing of colors circuit exists among the prior art, under the prerequisite that does not increase the cost, invent a new segmentation mixing of colors constant current controller that adjusts luminance, make L ED load also can work, make the best of things at full load under the condition of neutral color.

According to the utility model discloses a first aspect provides a switch segmentation mixing of colors light control constant current controller integrated circuit, its inside is equipped with mixing of colors light control circuit, first, two NMOS pipes and constant current control circuit, wherein, mixing of colors light control circuit is in a predetermined time, based on the rising and the decline of integrated circuit mains Voltage (VCC), produces first, two color temperature control signal and luminance adjustment signal; the grid electrodes of the first NMOS tube and the second NMOS tube respectively receive the first color temperature control signal and the second color temperature control signal, the drain electrodes are respectively connected with a first constant current source load and a second constant current source load which are connected in parallel with the outside and have different color temperatures, and the source electrodes are commonly connected with a load current detection signal from an external power conversion stage; and the constant current control circuit is used for adjusting the average value of the sum of the currents of the first constant current source load and the second constant current source load by controlling the on and off of a power switch in an external power conversion stage based on the load current detection signal and the brightness adjustment signal.

In the first aspect, it is preferable that the color-adjusting and light-adjusting control circuit includes a power-on/power-off detection circuit, a timer, a status register, a color-adjusting decoding circuit, and a light-adjusting decoding circuit, wherein the power-on/power-off detection circuit is connected to a power supply terminal of the integrated circuit, and when it is detected that a Voltage (VCC) at the power supply terminal decreases, a status update signal is generated, and the timer is started to time; turning off the timer for timing when the rise of the Voltage (VCC) at the power supply terminal is detected within the predetermined time; the state register receives the state updating signal and updates the state information of the state register; the color-mixing decoding circuit receives the state information output by the state register and decodes the state information into the first and second color temperature control signals; and the dimming decoding circuit receives the state information output by the state register and decodes the state information into the brightness adjusting signal.

Preferably, the timer outputs a reset signal to the status register when the power-on/off detection circuit does not detect a rise in the power supply terminal Voltage (VCC) within the predetermined time.

Preferably, the status register adopts a quaternary counter consisting of two D flip-flops.

Preferably, the constant current control circuit includes a constant current circuit, and the constant current circuit includes: an error amplifying circuit, one input end receives the load current detection signal, the other input end receives the brightness adjusting signal, and the output end generates an amplified error signal; a comparator comparing the amplified error signal with a sawtooth wave signal and generating a PWM signal.

Preferably, the constant current control circuit further comprises a driver, the PWM signal is connected to an input terminal of the driver, and an output terminal of the driver is connected to a gate of the power switch.

According to a second aspect, there is provided an apparatus for driving a constant current source load, the constant current source load comprising a first constant current source load and a second constant current source load connected in parallel and having different color temperatures, the apparatus comprising the integrated circuit of the first aspect, a power conversion stage and a supply resistor, the power conversion stage comprising a power switch, an inductor, a freewheeling diode, a capacitor and a detection resistor, wherein the power switch has a drain connected to an input voltage source (VIN) and a source connected to an anode of the freewheeling diode via the inductor; the negative electrode of the freewheeling diode is connected with a VCC node between the power supply resistor and one end of the capacitor; the other end of the capacitor is connected to a node between the source electrodes of the first NMOS tube and the second NMOS tube in the integrated circuit and one end of the detection resistor, the capacitor supplies power to the integrated circuit and is used as a filter capacitor of the constant current source load; and the other end of the detection resistor is connected to the reference ground of the integrated circuit and used for generating a load current detection signal.

In the second aspect, it is preferable that the first constant current source load is a cold constant current source load, and the second constant current source load is a warm constant current source load.

According to a third aspect, there is provided a smart lighting fixture comprising the apparatus of the second aspect above and a cold L ED load and a warm L ED load connected in parallel.

According to the utility model discloses a segmentation mixing of colors constant current controller and corresponding drive arrangement of adjusting luminance can make L ED load full load work under the condition of neutral color, realizes simultaneously that can the segmentation mixing of colors and can the segmentation adjust luminance again comparing with popular scheme on the existing market, the utility model discloses not only the cost is lower, and the performance is more excellent moreover, and is rather valuable to L ED intelligence illumination further popularization.

Drawings

For better understanding of the present invention, the following embodiments are described in detail with reference to the accompanying drawings. In the drawings:

FIG. 1 is a current L ED sectional toning circuit;

fig. 2 is a circuit diagram of a constant current source load driving apparatus according to an embodiment of the present invention;

FIG. 3 is an example of the dimming control circuit of FIG. 2;

FIG. 4 is an example of the power up/down detection circuit, timer and status register of FIG. 3;

FIG. 5 is an example of the palette decoding circuit of FIG. 3;

FIG. 6 is an example of the dimming decoding circuit of FIG. 3;

fig. 7 is an example of the color-adjusting and dimming status truth table of the present invention;

fig. 8 is an example of the constant current control circuit of fig. 2;

fig. 9 is an example of the constant current circuit in fig. 8.

Detailed Description

The inventor considers that to achieve full load operation of L ED load in neutral color, it is necessary that the operating current of the warm color load and the cold color load cannot be halved, i.e. the output current of the preceding stage constant current circuit is required to be doubled.

To solve this problem without increasing the cost, a new circuit configuration must be found. The primary task of the new structure is to solve the problem that the color temperature controller and the constant current controller are not grounded. The common ground problem is solved, and the color temperature controller and the constant current controller can be integrated together to further reduce the cost.

Referring to fig. 2, fig. 2 is a circuit diagram of a constant current source load driving apparatus according to an embodiment of the present invention, which is different from a general buck-boost topology, the driving apparatus employs a modified buck-boost topology, where the constant current source load is composed of

L ED loads

005 and 006 connected in parallel, and the two loads have different color temperatures, for example, L ED load 005 is a cold color temperature and L ED load 006 is a warm color temperature, the driving apparatus includes a switch segment dimming constant current controller integrated circuit 400, a power conversion stage and a supply resistor 301, the power conversion stage is composed of a power switch 307, an inductor 309, a freewheeling diode 308, a capacitor 604 and a detection resistor 306, where a drain of the power switch 307 is connected to an input voltage source VIN, a source is connected to an anode of the freewheeling diode 308 via the inductor 309, a cathode of the freewheeling diode 308 is connected to a VCC node between the supply resistor 301 and one end of the capacitor 604, the other end of the capacitor 604 is connected to a node between sources of NMOS transistors 403 and one end of the detection resistor 306 in the controller integrated circuit 400, supplies power to the controller integrated circuit 400, and serves as L, and the other end of the capacitor is connected to the detection resistor for detecting the gnd integrated circuit 400, and the detection circuit for generating a detection.

During the closing phase of the power switch 307, i.e. the charging phase of the inductor 309, the charging slope is VIN/L, after the power switch 307 is turned off, the inductor 309 enters the discharging phase, the discharging slope is VCC/L (VCC voltage is the voltage on the capacitor 604), the discharging loop is that current flows out from the GND terminal of the inductor 309, enters the VCC node through the freewheeling diode 308, and flows back to the ICGND terminal of the inductor 309 through the capacitors 604 and

L ED loads

005 and 006, it can be seen that the capacitor 604 is not only the filter capacitor of the

L ED loads

005 and 006, but also the supply capacitor of the controller integrated circuit 400.

In the driving device, a switch sectional color-adjusting light-adjusting constant-current controller integrated circuit 400 realizes the common reference ground and integration of a constant-current controller and a color temperature controller, as shown in fig. 2, a constant-current control circuit 410, a color-adjusting light-adjusting control circuit 420 and

NMOS tubes

403 and 404 are arranged inside the controller integrated circuit 400, and accordingly, L EDN1 and L EDN2 are additionally arranged in pins of the controller integrated circuit 400 and are respectively connected with the negative electrodes of cold and warm color

L ED loads

005 and 006.

In the controller integrated circuit 400, the color temperature control signals GT1, GT2 and the brightness adjustment signal ADJ are generated by the color tuning and dimming control circuit 420 based on the rising and falling of the voltage VCC at the power supply terminal of the controller integrated circuit 400 within a predetermined time, the gates of the

NMOS transistors

403, 404 receive the color temperature control signals GT1, GT2 respectively, the drains are connected

L ED loads

005 and 006 respectively, the sources are connected with the load current detection signal CS from the power conversion stage, the constant current control circuit 410 adjusts

L ED loads

005, 006 current average value by controlling the on and off of the power switch 307 in the power conversion stage based on the load current detection signal CS and the brightness adjustment signal ADJ, here, the brightness adjustment signal ADJ is the communication signal between the color tuning and dimming control circuit 420 and the constant current control circuit 410 for adjusting the magnitude of the constant current output current, thereby realizing the dimming (brightness adjustment) function.

When the lamp is turned on for the first time and the power is on, the voltage of the power grid is rectified and filtered, and then the VCC capacitor 604 is charged through the power supply resistor 301; when the voltage of the capacitor 604 rises to a certain level, the controller integrated circuit 400 starts to operate. According to the requirement of the initial state, the color tuning and dimming control circuit 420 outputs the corresponding color temperature control signals GT1 and GT2 to the

NMOS transistors

403 and 404, and outputs the brightness adjustment signal ADJ. The constant current control circuit 410 determines the magnitude of the final output current according to the load current detection signal CS and the brightness adjustment signal ADJ. When the lamp is turned off and powered down, and then turned on again within a predetermined time, such as 5 seconds, the color temperature control signals GT1, GT2 and the brightness adjustment signal ADJ are adjusted by the color temperature adjustment circuit 420 according to a predetermined program to achieve the change of the color temperature and brightness of the load. If the lamp is not turned on within 5 seconds for example after the lamp is turned off and power is lost, the state of color-adjusting and dimming can be reset.

It can be seen that compared with the circuit of fig. 1, the circuit of fig. 2 has obvious advantages, both color modulation and light modulation can be performed on L ED load, the circuit cost is lower, and the performance is better.

Referring to fig. 3, fig. 3 is an example of the color-adjusting dimming control circuit in fig. 2. In this example, the toning and dimming control circuit includes a power-up/power-down detection circuit 421, a timer 422, a status register 423, a toning and decoding circuit 424, and a dimming decoding circuit 425. The power-on/power-off detection circuit 421 is connected to the power supply terminal VCC of the controller integrated circuit 400, and when detecting that the power supply terminal voltage VCC is reduced, the detection circuit 421 generates a state update signal and starts the timer 422 to time; the detection circuit 421 turns off the timer 422 when detecting that the voltage VCC of the power supply rises for a predetermined time, for example, 5 seconds. The status register 423 receives the status update signal and updates the status information thereof. The tone decoding circuit 424 receives the status information output from the status register 423 and decodes the status information into color temperature control signals GT1, GT 2. The dimming decoding circuit 425 also receives the status information output from the status register 423 and decodes the status information into the brightness adjustment signal ADJ. If the detection circuit 421 does not detect the rise of the voltage VCC within the predetermined time of 5 seconds, the timer 422 outputs a reset signal to the status register 423.

Fig. 4 is an example of the power up/down detection circuit, timer and status register of fig. 3. As shown in fig. 4, the status register 423 employs a quaternary counter composed of two D flip-flops. When the light is turned off, the comparator in the power-on/power-off detection circuit 421 will output a status update signal of a falling edge to the status register 423, so that the status information of the latter can be updated, and at the same time, the timer 422 is started to time. If the light-on operation occurs within the next 5 seconds, the comparator of the power-up/power-down detection circuit 421 outputs a high signal to turn off the timer 422 for timing. If the lamp is not turned on again for more than 5 seconds, the timer 422 outputs a high pulse to reset the status register 423, so that the dimming and toning status information is reset. Thus, the circuit of fig. 4 implements the update and reset operations of the dimming and toning state information.

Fig. 5 is an example of the tone decoding circuit of fig. 3. In this example, the palette decoding circuit is composed of two nand gates, the input signals of which are from the status register 423, and the output color temperature control signals GT1, GT2 are provided to the

NMOS transistors

403 and 404.

Fig. 6 is an example of the dimming decoding circuit of fig. 3. As shown in fig. 6, the circuit is composed of a nand gate, an inverter and two NMOS transistors, the input signal is from the status register 423, and the output brightness adjustment signal ADJ is provided to the constant current control circuit 410.

Fig. 4-6 show a complete example of a palette dimming control circuit 420, and the palette dimming state truth table implemented as shown in fig. 7. The table has four segments, three color temperatures and two optional luminances (one is an enhanced luminance). When the lamp is powered on for the first time, the light is warm, after the lamp is turned off within 5 seconds, the light is changed into cold, after the lamp is turned off within 5 seconds, the light is changed into neutral (the warm load and the cold load are simultaneously on), or after the lamp is turned off within 5 seconds, the light is also neutral (the warm load and the cold load are simultaneously on), but the brightness is doubled. It should be noted that this is only one color temperature and brightness combination, and there may be many combinations, such as three-segment three color temperature and two brightness; for example, four segments of three colors and three luminances are not illustrated here.

Referring to fig. 8, fig. 8 is an example of the constant current control circuit in fig. 2. The constant current control circuit 410 includes a power supply management circuit 411, a constant current circuit 412, and a driver 413. The power management circuit 411 is used to detect whether the operating voltage (VCC node voltage) of the controller integrated circuit 400 is within a normal range, and provide appropriate voltage and current for other sub-circuit modules in the integrated circuit 400.

Fig. 9 is an example of the constant current circuit in fig. 8. As shown in fig. 9, the constant current circuit includes an error amplification circuit and a comparator 415. Wherein, an input end of the error amplifying circuit receives the load current detection signal CS, the other input end receives the brightness adjusting signal ADJ, and an output end of the error amplifying circuit generates an amplified error signal; comparator 415 compares this amplified error signal to the sawtooth signal and generates a PWM signal. As shown in fig. 8, the PWM signal is connected to the input terminal of the driver 413, and the output terminal of the driver 413 is connected to the gate of the power switch 307.

According to the present invention, the constant current output current of the driving device is determined by the voltage v (adj) and the detecting resistor 306, as shown in the following formula:

I_OUT＝V(ADJ)/R₃₀₆

in the foregoing description, although the present invention is described with reference to driving L ED loads, it will be readily understood by those skilled in the art that the present invention may be used to drive any type of constant current source load.

Obviously, many variations of the invention described herein are possible, and such variations are not to be regarded as a departure from the spirit and scope of the invention. Accordingly, all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of this invention as set forth in the following claims.

Claims

1. A switch sectional color-adjusting light-adjusting constant-current controller integrated circuit is provided with a color-adjusting light-adjusting control circuit, a first NMOS tube, a second NMOS tube and a constant-current control circuit inside,

the color-adjusting and dimming control circuit generates a first color-temperature control signal, a second color-temperature control signal and a brightness adjusting signal based on the rising and falling of the voltage VCC of the power supply of the integrated circuit within a preset time;

the grid electrodes of the first NMOS tube and the second NMOS tube respectively receive the first color temperature control signal and the second color temperature control signal, the drain electrodes of the first NMOS tube and the second NMOS tube are respectively connected with a first constant current source load and a second constant current source load which are connected with the outside in parallel and have different color temperatures, and the source electrodes of the first NMOS tube and the second NMOS tube are commonly connected with a load current detection signal from an external power;

and the constant current control circuit is used for adjusting the average value of the sum of the currents of the first constant current source load and the second constant current source load by controlling the on and off of a power switch in an external power conversion stage based on the load current detection signal and the brightness adjustment signal.

2. The integrated circuit of claim 1, wherein the palette dimming control circuit comprises a power-up/power-down detection circuit, a timer, a status register, a palette decoding circuit, and a palette decoding circuit, wherein,

the power-on/power-off detection circuit is connected with the power supply end of the integrated circuit, generates a state updating signal when detecting that the voltage VCC at the power supply end is reduced, and starts the timer to time; under the condition that the voltage VCC at the power supply terminal is detected to rise in the preset time, closing the timer for timing;

the state register receives the state updating signal and updates the state information of the state register;

the color-mixing decoding circuit receives the state information output by the state register and decodes the state information into the first and second color temperature control signals;

and the dimming decoding circuit receives the state information output by the state register and decodes the state information into the brightness adjusting signal.

3. The integrated circuit of claim 2, wherein the timer outputs a reset signal to the status register if the power-up/down detection circuit does not detect a rise in the voltage VCC for the predetermined time.

4. An integrated circuit as claimed in claim 2 or 3, characterised in that said status register employs a quaternary counter consisting of two D flip-flops.

5. The integrated circuit of claim 1, wherein the constant current control circuit comprises a constant current circuit comprising:

an error amplifying circuit, one input end receives the load current detection signal, the other input end receives the brightness adjusting signal, and the output end generates an amplified error signal;

a comparator comparing the amplified error signal with a sawtooth wave signal and generating a PWM signal.

6. The integrated circuit of claim 5, wherein the constant current control circuit further comprises a driver, the PWM signal is connected to an input terminal of the driver, and an output terminal of the driver is connected to a gate of the power switch.

7. An apparatus for driving a constant current source load, the constant current source load being composed of a first and a second constant current source loads of different color temperatures connected in parallel, the apparatus comprising the integrated circuit of any one of claims 1 to 6, a power conversion stage, the power conversion stage comprising a power switch, an inductor, a freewheeling diode, a capacitor and a sense resistor, wherein,

a power switch, wherein the drain electrode of the power switch is connected with an input voltage source (VIN), and the source electrode of the power switch is connected with the anode of the freewheeling diode through the inductor;

the negative electrode of the freewheeling diode is connected with a VCC node between the power supply resistor and one end of the capacitor;

the other end of the capacitor is connected to a node between the source electrodes of the first NMOS tube and the second NMOS tube in the integrated circuit and one end of the detection resistor, the capacitor supplies power to the integrated circuit and is used as a filter capacitor of the constant current source load;

and the other end of the detection resistor is connected to the reference ground of the integrated circuit and used for generating a load current detection signal.

8. The apparatus of claim 7 wherein said first constant current source load is a cold constant current source load and said second constant current source load is a warm constant current source load.

9. An intelligent lighting fixture, comprising the apparatus of claim 7 and a cold L ED load and a warm L ED load connected in parallel.