CN210225838U - Dimming and color mixing circuit - Google Patents
Dimming and color mixing circuit Download PDFInfo
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- CN210225838U CN210225838U CN201920514426.7U CN201920514426U CN210225838U CN 210225838 U CN210225838 U CN 210225838U CN 201920514426 U CN201920514426 U CN 201920514426U CN 210225838 U CN210225838 U CN 210225838U
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Abstract
The utility model discloses a dimming and color mixing circuit, alternating current power supply supplies power to lighting module through rectifier bridge and power level circuit, lighting module includes parallelly connected first load and second load, and first load and second load are established ties first switch tube and second switch tube respectively, dimming and color mixing circuit includes first module, second module and third module, PWM control signal is received to the first module, outputs the first signal that represents PWM control signal; the second module and the third module receive a first signal representing the PWM control signal and respectively control the connection and disconnection of the first switch tube and the second switch tube. The utility model discloses a mixing of colors circuit of adjusting luminance is comparatively simple, need not the opto-coupler and can accomplish the signal transmission between the different ground modules of referring to.
Description
Technical Field
The utility model relates to a power electronic technology field, more specifically the theory says, relates to a mixing of colors circuit adjusts luminance.
Background
LED solid state lighting speeds up the intelligent upgrade of traditional lighting, requiring adjustments to brightness and color temperature in more and more situations and applications. The development of the Internet of things brings greater opportunity for intelligent illumination, and the intelligent illumination is used as a link which is most and extremely important in realizing the interconnection of everything, so that the control and intelligent upgrade of the traditional illumination are realized through interconnection and intercommunication. The traditional lighting scheme can not be changed more on the original power supply mode, and the requirements of dimming and color temperature regulation are required to be realized by using a new solution. In order to meet the requirement of intelligent illumination color temperature regulation, at present, many schemes adopt two paths of LEDs at an output end, and two independent switching tubes are respectively adopted to control the conduction of each path. The single chip microcomputer or the wireless module for controlling the switch tube is often required to be connected with the output LED to realize the control of the switch tube.
As shown in fig. 1, the ac power supply supplies power to the load through the rectifier bridge and the power stage circuit, and the PWM control signals are used to control the respective conduction of the LED1 and the LED2, so as to adjust the color temperature. In fig. 1, the load of the power supply part, i.e., the LED, is a floating structure, but the single chip or the wireless module is relatively solid, the PWM control signal output by the single chip or the wireless module cannot be directly transmitted to the switching tube connected in series to the LED to provide the PWM control signal, and in order to realize the transmission of the PWM control signal, an additional optocoupler and other auxiliary devices are required to be added. The optical coupler is required to be utilized in the prior art, so that the whole application system is complex, the size is large, the integration of optical coupler devices inevitably brings cost and process problems, and the use of the optical coupler in miniaturized lighting equipment is limited.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a need not the opto-coupler, it is comparatively simple, the mixing of colors circuit of adjusting luminance that can integrate in littleer chip. The method is used for solving the technical problems that the whole application system is complex and the size is large due to the introduction of the optocoupler in the prior art.
The utility model provides a mixing of colors circuit of adjusting luminance, alternating current power supply supplies power to lighting module through rectifier bridge and power level circuit, lighting module is including parallelly connected first load and second load, and first switch tube and second switch tube are established ties respectively to first load and second load, and the mixing of colors circuit of adjusting luminance includes: the first module receives the PWM control signal and outputs a first signal representing the PWM control signal; the second module and the third module receive a first signal representing the PWM control signal and respectively control the connection and disconnection of the first switch tube and the second switch tube.
Optionally, the first module includes a third switching tube, a control end of the third switching tube receives the PWM control signal, and when the third switching tube is turned on, a current passing through the third switching tube is pulled down to a first current.
Optionally, when a PWM control signal received by the control end of the third switching tube is in a first state, the third switching tube is turned on, the first switching tube is turned off, and the second switching tube is turned on; when the PWM control signal received by the control end of the third switching tube is in a second state, the third switching tube is turned off, the first switching tube is turned on, and the second switching tube is turned off.
Optionally, the second module and the third module each include a driving module, and the driving modules in the second module and the third module respectively drive the first switching tube and the second switching tube by using the output voltage of the power stage circuit.
Optionally, the third module further includes a signal conversion module, and the signal conversion module converts the received first signal into a second signal complementary to the first signal, so that the first switching tube and the second switching tube are turned on and off oppositely.
Optionally, the driving module includes a second resistor or a second resistor and a third resistor, the second resistor is connected between the high potential end of the output of the power stage circuit and the control end of the first switching tube or the second switching tube, or the second resistor and the third resistor are connected in series and then connected between the high potential end of the output of the power stage circuit and the second end of the first switching tube or the second switching tube, and the control end of the first switching tube or the second switching tube is connected to the common end of the second resistor and the third resistor.
Optionally, the second module or/and the third module include a voltage regulator tube, and the voltage regulator tube is connected between the control end of the first switch tube or/and the second switch tube and the second end thereof.
Optionally, the first module, the third module, the first switching tube, and the second switching tube are integrated in a chip.
Compared with the prior art, the technical scheme of the utility model has following advantage: the utility model discloses utilize first module directly to change PWM control signal into the first signal of the characterization PWM control signal that switches on and turn-off that can the first switch tube of direct control and second switch tube, second module and third module are received first signal, the first switch tube of control and second switch tube switch on in turn, turn-off to the realization is to the regulation of load LED colour temperature. The utility model provides an among the prior art need utilize the opto-coupler to change PWM control signal into the control signal that can the first switch tube of direct control and second switch tube switch on and turn-off, cause whole application comparatively complicated, the great problem of volume. The utility model discloses a mixing of colors circuit of adjusting luminance is comparatively simple, need not the opto-coupler and can accomplish the signal transmission between the different ground modules of referring to, and can integrate in littleer chip, uses simplyfying, and is miniaturized.
Drawings
FIG. 1 is a diagram illustrating a prior art dimming and toning method;
FIG. 2 is a schematic diagram of the light and color adjusting circuit of the present invention;
fig. 3 is a schematic view of an embodiment of a first module and a second module of the present invention;
fig. 4 is a schematic view of an embodiment of the driving module of the present invention;
fig. 5 is a schematic view of a second embodiment of the driving module of the present invention;
fig. 6 is a schematic view of a third module according to the present invention;
fig. 7 is a schematic diagram of a second embodiment of a third module according to the present invention;
fig. 8 is a third schematic view of a third module according to the present invention;
FIG. 9 is a schematic view of an embodiment of a dimming and color-mixing circuit of the present invention when the switching tube is P-type;
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The present invention covers any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are simplified and in non-precise proportion, and are only used for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.
As shown in fig. 2, a schematic diagram of a dimming and color-adjusting circuit is shown, an ac power supply supplies power to a lighting module through a rectifier bridge and a power stage circuit, the lighting module includes a first load LED1 and a second load LED2 connected in parallel, the first load LED1 and the second load LED2 are respectively connected in series with a first switch tube M1 and a second switch tube M2, the dimming and color-adjusting circuit includes a first module, a second module and a third module, the first module receives a PWM control signal output by an MCU or a wireless module, and outputs a first signal representing the PWM control signal; the second module and the third module receive a first signal representing a PWM control signal and respectively control the connection and disconnection of the first switch tube and the second switch tube by utilizing the first signal. The first switch tube and the second switch tube are alternately switched on and off at different time, so that the LED1 and the LED2 are alternately switched on at different time, different color temperatures are obtained, and the purpose of dimming and toning is achieved.
The first signal representing the PWM control signal is the voltage at the control terminal of the first switch tube or the voltage at the first terminal of the first switch tube or the on/off signal of the third switch tube M3.
Fig. 3 shows a schematic diagram of an embodiment of the first module and the second module of the present invention, the first module includes a third switch tube M3, a control end of the third switch tube M3 receives a PWM control signal through a driving circuit, and when the third switch tube is turned on, a current through the third switch tube is pulled down to a first current.
When the PWM control signal received by the control terminal of the third switching tube M1 is in the first state, the third switching tube M3 is turned on, the first switching tube M1 is turned off, and the second switching tube M2 is turned on; when the PWM control signal received by the control terminal of the third switching tube M3 is in the second state, the third switching tube M3 is turned off, the first switching tube M1 is turned on, and the second switching tube M2 is turned off. The PWM control signal is converted to a first signal representative of the PWM control signal. The first end of the third switch tube is connected with the control end of the first switch tube, so that a signal is directly transmitted to the second module, and the first switch tube can be controlled to be switched on and off. Since the adjustment of the color temperature requires the alternating conduction of the LED1 and the LED2, the on and off of the second switch tube controlled by the third module is opposite to that of the first switch tube.
The first state and the second state are generally high level and low level, respectively, and may be opposite to each other, and the present invention is explained by using the first state and the second state as high level and low level.
The second module comprises a driving module, and the driving module in the second module drives the first switching tube by using the output voltage of the power stage circuit. The driving module is current-type driving or voltage-type driving. Fig. 4 shows a first embodiment of the driving module, which includes a second resistor R2, the second resistor R2 is connected between the high potential end of the output of the power stage circuit and the control end of the first switch tube M1, and a voltage regulator tube is connected between the control end of the first switch tube M1 and the second end thereof. When the first signal output by the first module is at a high level, the driving module drives the first switch tube M1 to be turned on.
Fig. 5 shows a second embodiment of the drive module. The driving module comprises a second resistor R2 and a third resistor R3, the second resistor R2 and the third resistor R3 are connected in series and then connected between a high potential end of the output of the power stage circuit and a second end of a first switching tube M1, and a control end of the first switching tube M1 is connected with a common end of the second resistor R2 and the third resistor R3. When the first signal output by the first module is at a high level, the driving module drives the first switch tube M1 to be turned on.
The first and second embodiments of fig. 4 and 5 only show two forms of driving module, and the driving module of the present invention can be driven by current or voltage, and the present invention is not limited thereto.
The first module and the second module are connected through a high-voltage process, and PWM control signals can be reliably transmitted. Two LED currents are controlled by a PWM signal, and two LEDs are required to be alternately conducted.
The third module also includes a driving module, the driving module in the third module drives the second switching tube by using the output voltage of the power stage circuit, and the driving module of the third module and the driving module of the second module have the same function and embodiment, which are not described herein again.
The third module further comprises a signal conversion module, the signal conversion module converts the received first signal into a second signal complementary to the first signal, and controls the on and off of the second switching tube M2 according to the second signal, so that the on and off of the first switching tube and the second switching tube are opposite.
Fig. 6 shows the first embodiment of the third module of the present invention, the signal conversion module includes an NPN, the base b of the NPN is connected to the control terminal of the first switch tube M1 through a first resistor, the emitter e thereof is connected to the second terminal of the first switch tube M1, and the collector c thereof is connected to the control terminal of the second switch tube M2. When the first switch tube M1 is turned on, the base b of the NPN is at a high level, the NPN is turned on, the second switch tube M2 is turned off, when the first switch tube M1 is turned off, the base b of the NPN is at a low level, the NPN is not turned on, and the second switch tube M2 is turned on under the driving of the driving circuit.
Fig. 7 shows a second embodiment of the third module of the present invention, the signal conversion module includes a PNP, the base b of the PNP is connected to the first end of the first switch tube M1, the emitter e thereof is connected to the control end of the second switch tube M2, and the collector c thereof is connected to the second end of the first switch tube. When the first switch tube M1 is turned on, the base b of the PNP is at a low level, the PNP is turned on, the second switch tube M2 is turned off, when the first switch tube M1 is turned off, the base b of the PNP is at a high level, the PNP is not turned on, and the second switch tube M2 is turned on under the driving of the driving circuit.
Fig. 8 shows a third embodiment of the third module of the present invention, wherein the signal conversion module includes a diode D1, the anode of the diode D1 is connected to the control terminal of the second switch tube M2, and the cathode of the diode D1 is connected to the first terminal of the first switch tube M1. When the first switch tube M1 is turned on, the diode D1 is turned on, the second switch tube M2 is turned off, and when the first switch tube M1 is turned off, the diode D1 is not turned on, and the second switch tube M2 is turned on under the driving of the driving circuit. And a voltage stabilizing tube is connected between the control end and the second end of the second switch tube.
The utility model discloses in first module, third module, first switch tube, second switch tube integration are in the chip. The dimming and color-mixing circuit without the optical coupler and the switching tube can be integrated on one chip, so that the size is reduced, the application range is expanded, and the miniature lighting device can also be used.
It should be noted that the switch transistor used in the above embodiment is an N-type MOS transistor, and the control terminal of the N-type MOS transistor is referred to as a gate, the first terminal is referred to as a drain, and the second terminal is referred to as a source. In other embodiments, the switching tube may be an NPN, and when the switching tube is an NPN, the NPN does not need a voltage regulator tube because the be terminal of the NPN has a voltage stabilizing function, and other circuits are the same as the N-type MOS. Besides NPN, the switch tube can be other switch tubes, and other switch tubes can achieve similar effects only through corresponding simple adjustment.
Furthermore, the utility model discloses all use N type switch tube as the example, but the switch tube of P type also is suitable for equally the utility model discloses, its specific implementation is shown in fig. 9, changes switch tube and LED position, and the switch tube in the embodiment uses PNP as the example, and its principle is the same with the embodiment of N type switch tube in, does not do the perplexing here. The switch can also be other switch tubes such as a P-type MOS tube and the like, and the similar effect can be achieved by corresponding simple adjustment.
The utility model provides a schematic diagram in the power stage circuit be buck circuit, nevertheless the utility model is suitable for an arbitrary power stage circuit, including boost, isolation and non-isolated circuit structure such as flyback.
In addition, although the embodiments are described and illustrated separately, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and reference may be made to one of the embodiments without explicit mention.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (8)
1. The utility model provides a mixing of colors circuit of adjusting luminance, alternating current power supply supplies power to lighting module through rectifier bridge and power level circuit, lighting module includes parallelly connected first load and second load, and first switch tube and second switch tube, its characterized in that are established ties respectively to first load and second load: the PWM control circuit comprises a first module, a second module and a third module, wherein the first module receives a PWM control signal and outputs a first signal representing the PWM control signal; the second module and the third module receive a first signal representing the PWM control signal and respectively control the connection and disconnection of the first switch tube and the second switch tube.
2. The dimming and toning circuit of claim 1, wherein: the first module comprises a third switch tube, a control end of the third switch tube receives a PWM control signal, and when the third switch tube is conducted, the current passing through the third switch tube is pulled down to be a first current.
3. The dimming and toning circuit of claim 2, wherein: when a PWM control signal received by a control end of a third switching tube is in a first state, the third switching tube is conducted, the first switching tube is turned off, and the second switching tube is conducted; when the PWM control signal received by the control end of the third switching tube is in a second state, the third switching tube is turned off, the first switching tube is turned on, and the second switching tube is turned off.
4. A dimming and toning circuit according to claim 1, 2 or 3, wherein: the second module and the third module respectively comprise driving modules, and the driving modules in the second module and the third module respectively drive the first switch tube and the second switch tube by using the output voltage of the power level circuit.
5. The dimming and toning circuit of claim 4, wherein: the third module further comprises a signal conversion module, and the signal conversion module converts the received first signal into a second signal complementary to the first signal, so that the first switching tube and the second switching tube are opposite in conduction and disconnection.
6. The dimming and toning circuit of claim 4, wherein: the driving module comprises a second resistor or a second resistor and a third resistor, the second resistor is connected between the high-potential end output by the power stage circuit and the control end of the first switching tube or the second switching tube, or the second resistor and the third resistor are connected in series and then connected between the high-potential end output by the power stage circuit and the second end of the first switching tube or the second switching tube, and the control end of the first switching tube or the second switching tube is connected with the common end of the second resistor and the third resistor.
7. The dimming and toning circuit of claim 6, wherein: the second module or/and the third module further comprises a voltage regulator tube, and the voltage regulator tube is connected between the control end of the first switch tube or/and the second switch tube and the second end of the first switch tube or/and the second switch tube.
8. The dimming and toning circuit of claim 4, wherein: the first module, the third module, the first switch tube and the second switch tube are integrated in a chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920514426.7U CN210225838U (en) | 2019-04-16 | 2019-04-16 | Dimming and color mixing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920514426.7U CN210225838U (en) | 2019-04-16 | 2019-04-16 | Dimming and color mixing circuit |
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| CN210225838U true CN210225838U (en) | 2020-03-31 |
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| CN201920514426.7U Active CN210225838U (en) | 2019-04-16 | 2019-04-16 | Dimming and color mixing circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110191534A (en) * | 2019-04-16 | 2019-08-30 | 杰华特微电子（张家港）有限公司 | A kind of light modulation toning circuit and method |
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2019
- 2019-04-16 CN CN201920514426.7U patent/CN210225838U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110191534A (en) * | 2019-04-16 | 2019-08-30 | 杰华特微电子（张家港）有限公司 | A kind of light modulation toning circuit and method |
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