CN110536511B - Dimmable LED lamp circuit - Google Patents
Dimmable LED lamp circuit Download PDFInfo
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- CN110536511B CN110536511B CN201910825139.2A CN201910825139A CN110536511B CN 110536511 B CN110536511 B CN 110536511B CN 201910825139 A CN201910825139 A CN 201910825139A CN 110536511 B CN110536511 B CN 110536511B
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Abstract
The invention discloses a dimmable LED lamp circuit, which can set three dimming and toning modes by setting a mode setting circuit and a controllable voltage division circuit, wherein the mode setting circuit has at least one corresponding change relation of brightness and color temperature in each mode, and the controllable voltage division circuit controls the magnitude of two paths of current output by a dimmable constant current circuit by adjusting the voltage accessed by the dimmable constant current circuit, so that the brightness of a first LED light-emitting circuit and the brightness of a second LED light-emitting circuit are adjusted; the dimming and color-mixing device has the advantages that various dimming and color-mixing modes can be selected by a user, the user can select a brightness and color temperature corresponding change relation in one mode as a brightness and color temperature corresponding change relation for practical use in the three modes through continuous switch operation, the color temperature can continuously change along with the brightness or keep unchanged according to the selected brightness and color temperature corresponding change relation when the brightness is continuously adjusted, and the flexibility of color temperature adjustment is high.
Description
Technical Field
The invention relates to an LED lamp circuit, in particular to a dimmable LED lamp circuit.
Background
With the continuous improvement of the LED lamp technology, the dimmable LED lamp can directly replace an incandescent lamp under the condition of unchanging an external circuit, and is widely applied. Dimmable LED lamps are primarily dimmable by dimmers. The commonly used dimmer chops the sine wave of the mains supply to change the effective voltage input into the lamp, so that the brightness of the lamp is changed. Such dimmers have both switching and regulator functions, with two connection ports. In a specific application circuit, one connecting port of the light modulator is connected with a live wire of a mains supply, the other connecting port of the light modulator is connected with a live wire access end of at least one light-adjustable LED lamp, and a zero line access end of the light-adjustable LED lamp is connected to a zero line of the mains supply. When the switch of the dimmer is switched off, the dimmable LED lamp is not connected with the mains supply and does not emit light, and when the switch of the dimmer is switched on, the dimmable LED lamp is connected with the mains supply, the effective input voltage of the dimmable LED lamp can be adjusted through the dimmer of the dimmer at the moment, and the dimmable LED lamp emits brightness corresponding to the effective input voltage.
The existing dimmable LED lamp usually has a color temperature adjusting function on the basis of the dimming function. Because different lighting atmospheres can be created by adjusting the color temperature, the dimmable LED lamp with the dimming function and the color temperature adjusting function is increasingly favored by users. The LED light-emitting module arranged in the dimmable LED lamp at least comprises a group of high-color-temperature LED light-emitting circuits and a group of low-color-temperature LED light-emitting circuits. When the total current flowing through the LED light-emitting module changes, the light-emitting brightness of the LED light-emitting module also changes. When the proportion of the current flowing through the high color temperature LED light-emitting circuit and the low color temperature LED light-emitting circuit changes, the light-emitting color temperature of the LED light-emitting module also changes at the moment because the light-emitting brightness of the high color temperature LED light-emitting circuit and the light-emitting brightness of the low color temperature LED circuit are in direct proportion to the current flowing through the high color temperature LED light-emitting circuit and the light-emitting brightness of the low color temperature LED circuit. Therefore, the brightness of the existing dimmable LED lamp is adjusted by adjusting the current flowing through the LED light-emitting module, and the color temperature is adjusted by adjusting the current size ratio of the high-color-temperature LED light-emitting circuit and the low-color-temperature LED light-emitting circuit.
At present, according to the colour temperature mode of regulation, the LED lamp of can adjusting luminance is divided into two main categories, and first class LED lamp colour temperature of adjusting luminance can not set up, and its luminance and colour temperature change together, and every luminance of this class LED lamp of can adjusting luminance has only unique colour temperature, and the LED lamp of second class can adjusting luminance is through the switch of operation dimmer, selects one of them colour temperature of several kinds of colour temperatures earlier, then under the colour temperature of settlement, and adjustable luminance, every luminance of this class LED lamp of can adjusting luminance has several kinds of different colour temperatures to choose. Although the second dimmable LED lamp provides different color temperature requirements for different users compared with the first dimmable LED lamp, the brightness is adjusted under the condition of setting the color temperature, and the flexibility of color temperature adjustment is not enough.
Disclosure of Invention
The invention aims to solve the technical problem of providing a dimmable LED lamp circuit which has multiple dimming and color-mixing modes for users to select and has higher flexibility of color temperature adjustment.
The technical scheme adopted by the invention for solving the technical problems is as follows: a dimmable LED lamp circuit comprises a rectifying circuit for converting commercial power alternating current into direct current voltage for output, a first LED light-emitting circuit with high color temperature, a second LED light-emitting circuit with low color temperature and a dimmable constant current circuit, wherein the rectifying circuit is provided with a live wire input end, a zero wire input end, an output end and a grounding end, the first LED light-emitting circuit and the second LED light-emitting circuit are respectively provided with a positive pole and a negative pole, the dimmable constant current circuit is provided with an input end, a first control end, a second control end, a first output end, a second output end and a grounding end, the input end of the dimmable constant current circuit, the positive pole of the first LED light-emitting circuit and the positive pole of the second LED light-emitting circuit are all connected with the output end of the rectifying circuit and are connected with the direct current voltage output by the rectifying circuit, and the first output end of the dimmable constant current circuit is connected with the negative pole of the first LED, the second output end of the adjustable light constant current circuit is connected with the negative electrode of the second LED light-emitting circuit, the first output end of the adjustable light constant current circuit outputs a first path of current for controlling the light-emitting intensity of the first LED light-emitting circuit, the magnitude of the first path of current is adjusted by the voltage accessed by the first control end of the adjustable light constant current circuit, the second output end of the adjustable light constant current circuit outputs a second path of current for controlling the light-emitting intensity of the second LED light-emitting circuit, the magnitude of the second path of current is adjusted by the voltage accessed by the second control end of the adjustable light constant current circuit, the adjustable light LED lamp circuit further comprises a mode setting circuit and a controllable voltage division circuit, the mode setting circuit is provided with a positive electrode, a detection end, a first control end, a second control end and a grounding end, the controllable voltage division circuit is provided with an input end, a voltage output end is connected with the negative electrode of the second LED, The detection end of the mode setting circuit is connected with the live wire input end or the zero line input end of the rectifying circuit, the anode of the mode setting circuit and the input end of the controllable voltage division circuit are respectively connected with the output end of the rectifying circuit, the first control end of the mode setting circuit is connected with the first control end of the controllable voltage division circuit, the second control end of the mode setting circuit is connected with the second control end of the controllable voltage division circuit, the first output end of the controllable voltage division circuit is connected with the first control end of the adjustable light constant current circuit, the second output end of the controllable voltage division circuit is connected with the second control end of the adjustable light constant current circuit, and the grounding end of the mode setting circuit, The grounding end of the controllable voltage division circuit and the grounding end of the dimmable constant current circuit are connected with the grounding end of the rectifying circuit; the mode setting circuit is used for setting the dimming and color mixing modes, the mode setting circuit can set three modes, and at least one corresponding variation relation of brightness and color temperature exists in each mode, and the three modes are as follows: when the light modulator is switched on, if the switch is first turned off and then turned on again within a set time, the mode setting operation is considered to be performed, and the corresponding change relationship between the brightness and the color temperature set by the mode setting circuit is switched once every time the mode setting operation is performed, when the mode setting operation is performed, if the corresponding change relationship between the brightness and the color temperature set by the mode setting circuit at present is the last corresponding change relationship between the brightness and the color temperature in a certain mode, at the moment, the corresponding change relationship between the brightness and the color temperature is switched to the corresponding change relationship between the first brightness and the color temperature in the next mode, otherwise, the corresponding change relationship between the brightness and the color temperature is adjusted to be the next corresponding change relationship between the brightness and the color temperature in the current mode, the corresponding change relationship between the brightness and the color temperature after switching is stored as the default relationship, when the corresponding change relationship between the brightness and the color temperature in the third dimming and color mixing mode is switched, the corresponding change relationship between the first brightness and the color temperature in the first mode is switched again when the mode setting operation is carried out, the corresponding change relationship between the first brightness and the color temperature in the first mode is repeatedly carried out, the first control end of the mode setting circuit outputs the corresponding first control voltage according to the current mode, the second control end of the mode setting circuit outputs the corresponding second control voltage according to the current mode, and the controllable voltage division circuit is respectively provided with the linear relationship between the first control end voltage and the voltage output by the first output end of the first control voltage and the linear relationship between the second control end voltage and the voltage output by the second output end of the second control voltage The output voltage of the first and second output ends of the controllable voltage division circuit respectively presents respective corresponding changes along with the effective voltage of the output end of the rectification circuit according to the voltage accessed from the output end of the mode setting circuit; according to the mode set by the mode setting circuit, the first output end of the controllable voltage division circuit outputs corresponding voltage to adjust the first path of current output by the first output end of the dimmable constant current circuit to adjust the brightness of the first LED light-emitting circuit, and the second output end of the controllable voltage division circuit outputs corresponding voltage to adjust the second path of current output by the second output end of the dimmable constant current circuit to adjust the brightness of the second LED light-emitting circuit, so that the color temperature setting is realized.
The mode setting circuit comprises a first resistor, a second resistor, a first capacitor and a first chip, the model of the first chip is S4223M, the 6 th pin of the first chip is the first control end of the mode setting circuit, the 1 st pin of the first chip is the second control end of the mode setting circuit, the 3 rd pin of the first chip is connected with one end of the second resistor, the other end of the second resistor is the anode of the mode setting circuit, the 4 th pin of the first chip is connected with one end of the first capacitor, the 5 th pin of the first chip is connected with one end of the first resistor, the other end of the first resistor is the detection end of the mode setting circuit, the 2 nd pin of the first chip is connected with the other end of the first capacitor, and the connecting end of the first chip is the grounding end of the mode setting circuit.
The controllable voltage division circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a first diode, the first diode is a voltage stabilizing diode, one end of the third resistor is a first control end of the controllable voltage division circuit, one end of the fourth resistor is a second control end of the controllable voltage division circuit, the other end of the third resistor is connected with one end of the sixth resistor, the connection end of the third resistor is a first output end of the controllable voltage division circuit, the other end of the fourth resistor is connected with one end of the seventh resistor, the connection end of the fourth resistor is a second output end of the controllable voltage division circuit, the other end of the sixth resistor, the other end of the seventh resistor, one end of the fifth resistor and the cathode of the first diode are connected, and the other end of the fifth resistor is an input end of the controllable voltage division resistor, the anode of the first diode is the grounding end of the controllable voltage division circuit. The output voltage of the first output end and the output voltage of the second output end of the circuit are not only related to the voltage waveform of the input end of the circuit, but also related to the access states of the first control end and the second control end of the circuit respectively, when the access states of the first control end and the second control end are different, the first control end and the second control end output different voltage size ratios when the input ends are in different voltage waveforms, and therefore control of two paths of output currents of the dimmable constant current circuit is achieved.
The dimmable constant current circuit comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second capacitor, a third capacitor, a second chip and a third chip, wherein the model of the second chip is SM088, the model of the third chip is RM9012D, one end of the eighth resistor is connected with one end of the ninth resistor, the connecting end of the eighth resistor is the input end of the dimmable constant current circuit, the other end of the eighth resistor is connected with the 1 st pin of the second chip, the 3 rd pin of the second chip, one end of the second capacitor, one end of the third capacitor, one end of the tenth resistor, one end of the eleventh resistor, one end of the twelfth resistor are connected with the bottom electrode of the third chip, the 1 st pin of the third chip is connected with the other end of the second capacitor, and the connecting end of the third pin is the first control end of the dimmable constant current circuit, the 3 rd pin of the third chip is connected with the other end of the third capacitor, and the connecting end of the third chip is the second control end of the dimmable constant current circuit, the 2 nd pin of the third chip is connected with the other end of the tenth resistor, the 4 th pin of the third chip is connected with the other end of the eleventh resistor, the 5 th pin of the third chip is the second output end of the dimmable constant current circuit, the 6 th pin of the third chip is the first output end of the dimmable constant current circuit, the 8 th pin of the third chip is connected with the other end of the ninth resistor, the 2 nd pin of the second chip is connected with the other end of the twelfth resistor, and the connecting end of the second chip is the grounding end of the dimmable constant current circuit. The circuit is a linear dimmable constant current circuit and has the advantages of simple circuit and low cost.
Rectifier circuit adopt full-bridge rectifier bridge to pile up and realize, full-bridge rectifier bridge pile's the 1 st foot do rectifier circuit's live wire input end, full-bridge rectifier bridge pile's the 3 rd foot do rectifier circuit's zero line input end, full-bridge rectifier bridge pile's the 2 nd foot do rectifier circuit's output, full-bridge rectifier bridge pile's the 4 th foot do rectifier circuit's earthing terminal.
Compared with the prior art, the invention has the advantages that the mode setting circuit is used for setting the dimming and color mixing modes by setting the mode setting circuit and the controllable voltage division circuit, the mode setting circuit can set three modes, and at least one corresponding change relation of brightness and color temperature exists in each mode, and the three modes are as follows: the mode of the mode setting circuit is set by operating a switch of a dimmer in a state that the switch of the dimmer is closed, if the switch is firstly opened and then the switch is closed within a set time, the mode setting operation is considered to be performed once, the corresponding change relationship between the brightness and the color temperature set by the mode setting circuit is switched once every time the mode setting operation is performed, and if the corresponding change relationship between the brightness and the color temperature currently set by the mode setting circuit is the last corresponding change relationship between the brightness and the color temperature in a certain mode during the mode setting operation, the corresponding change relationship between the brightness and the color temperature is switched to the first corresponding change relationship between the brightness and the color temperature in the next mode at the moment, otherwise, the corresponding change relationship between the brightness and the color temperature is adjusted to be the next corresponding change relationship between the brightness and the color temperature in the current mode, the corresponding change relationship between the brightness and the color temperature after the switching is stored as the default relationship, when the corresponding change relationship between the brightness and the color temperature after the switching is switched to the last corresponding change relationship between the brightness and the color temperature in the third mode, the mode setting operation is performed, the corresponding change relationship between the first brightness and the color temperature in the first mode is switched to again, the operation is repeated in cycles, the first control end of the mode setting circuit outputs the corresponding first control voltage according to the current mode, the second control end of the mode setting circuit outputs the corresponding second control voltage according to the current mode, the controllable voltage division circuit is respectively provided with the linear relationship between the first control terminal voltage and the voltage output by the first output end of the first control terminal and the linear relationship between the second control terminal voltage and the voltage output by the second output end of the second control terminal, therefore, the output voltage of the first and second output ends of the controllable voltage division circuit respectively presents respective corresponding changes along with the effective voltage of the output end of the rectification circuit according to the voltage accessed from the output end of the mode setting circuit; according to the mode set by the mode setting circuit, the first output end of the controllable voltage division circuit outputs a first path of current output by the first output end of the corresponding voltage-adjusting dimmable constant current circuit to adjust the brightness of the first LED light-emitting circuit, and the second output end of the controllable voltage division circuit outputs a second path of current output by the second output end of the corresponding voltage-adjusting dimmable constant current circuit to adjust the brightness of the second LED light-emitting circuit, thereby realizing color temperature setting. The flexibility of color temperature adjustment is high.
Drawings
FIG. 1 is a block diagram of a dimmable LED lamp circuit according to the present invention;
fig. 2 is a circuit diagram of a dimmable LED lamp circuit of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example (b): as shown in FIG. 1, a dimmable LED lamp circuit comprises a rectifying circuit for converting commercial AC power into DC voltage and outputting, a first LED light-emitting circuit with high color temperature, a second LED light-emitting circuit with low color temperature and a dimmable constant current circuit, wherein the rectifying circuit comprises a live wire input end, a zero wire input end, an output end and a grounding end, the first LED light-emitting circuit and the second LED light-emitting circuit respectively comprise a positive electrode and a negative electrode, the dimmable constant current circuit comprises an input end, a first control end, a second control end, a first output end, a second output end and a grounding end, the input end of the dimmable constant current circuit, the positive electrode of the first LED light-emitting circuit and the positive electrode of the second LED light-emitting circuit are connected with the output end of the rectifying circuit, the DC voltage output by the rectifying circuit is switched in, the first output end of the dimmable constant current circuit is connected with the negative electrode of the first LED light-emitting circuit, the first output end of the adjustable light constant current circuit outputs a first path of current for controlling the luminous intensity of the first LED luminous circuit, the magnitude of the first path of current is adjusted by the voltage accessed by the first control end of the adjustable light constant current circuit, the second output end of the adjustable light constant current circuit outputs a second path of current for controlling the luminous intensity of the second LED luminous circuit, the magnitude of the second path of current is adjusted by the voltage accessed by the second control end of the adjustable light constant current circuit, the adjustable light LED lamp circuit is characterized by further comprising a mode setting circuit and a controllable voltage division circuit, the mode setting circuit is provided with an anode, a detection end, a first control end, a second control end and a grounding end, the controllable voltage division circuit is provided with an input end, a first control end, a second control end, a first output end, a second output end and a grounding end, and the detection end of the mode setting circuit is connected with the live wire input end or the, the positive pole of the mode setting circuit and the input end of the controllable voltage division circuit are respectively connected with the output end of the rectification circuit, the first control end of the mode setting circuit is connected with the first control end of the controllable voltage division circuit, the second control end of the mode setting circuit is connected with the second control end of the controllable voltage division circuit, the first output end of the controllable voltage division circuit is connected with the first control end of the dimmable constant current circuit, the second output end of the controllable voltage division circuit is connected with the second control end of the dimmable constant current circuit, and the grounding end of the mode setting circuit, the grounding end of the controllable voltage division circuit, the grounding end of the dimmable constant current circuit and the grounding end of the rectification circuit are connected; the mode setting circuit is used for setting dimming and toning modes, the mode setting circuit can set three dimming and toning modes, at least one corresponding change relation of brightness and color temperature exists in each dimming and toning mode (the corresponding change relation of the brightness and the color temperature is preset according to design requirements), and the three dimming and toning modes are as follows: the mode of the mode setting circuit is set by operating a switch of a dimmer in a state that the switch of the dimmer is closed, if the switch is firstly opened and then the switch is closed within a set time, the mode setting operation is considered to be performed once, the corresponding change relationship between the brightness and the color temperature set by the mode setting circuit is switched once every time the mode setting operation is performed, and if the corresponding change relationship between the brightness and the color temperature currently set by the mode setting circuit is the last corresponding change relationship between the brightness and the color temperature in a certain mode during the mode setting operation, the corresponding change relationship between the brightness and the color temperature is switched to the first corresponding change relationship between the brightness and the color temperature in the next mode at the moment, otherwise, the corresponding change relationship between the brightness and the color temperature is adjusted to the next corresponding change relationship between the brightness and the color temperature in the current mode, the corresponding change relationship between the brightness and the color temperature after the switching is stored as the default relationship, when the corresponding change relationship between the brightness and the color temperature in the third dimming and toning mode is switched, the mode setting operation is performed, the corresponding change relationship between the first brightness and the color temperature in the first mode is switched again, the process is repeated, the first control end of the mode setting circuit outputs the corresponding first control voltage according to the current mode, the second control end of the mode setting circuit outputs the corresponding second control voltage according to the current mode, the controllable voltage dividing circuit is respectively provided with the linear relationship between the first control terminal voltage and the voltage output by the first output end of the controllable voltage dividing circuit and the linear relationship between the second control terminal voltage and the voltage output by the second output end of the controllable voltage dividing circuit, therefore, the output voltage of the first and second output ends of the controllable voltage division circuit respectively presents respective corresponding changes along with the effective voltage of the output end of the rectification circuit according to the voltage accessed from the output end of the mode setting circuit; according to the mode set by the mode setting circuit, the first output end of the controllable voltage division circuit outputs the first path of current output by the first output end of the corresponding voltage-adjusting dimmable constant current circuit to adjust the brightness of the first LED light-emitting circuit, and the second output end of the controllable voltage division circuit outputs the second path of current output by the second output end of the corresponding voltage-adjusting dimmable constant current circuit to adjust the brightness of the second LED light-emitting circuit, so that the color temperature setting is realized.
In this embodiment, as shown in fig. 2, the mode setting circuit includes a first resistor R1, a second resistor R2, a first capacitor C1 and a first chip U1, the model of the first chip U1 is S4223M, the 6 th pin of the first chip U1 is a first control terminal of the mode setting circuit, the 1 st pin of the first chip U1 is a second control terminal of the mode setting circuit, the 3 rd pin of the first chip U1 is connected to one end of a second resistor R2, the other end of the second resistor R2 is an anode of the mode setting circuit, the 4 th pin of the first chip U1 is connected to one end of the first capacitor C1, the 5 th pin of the first chip U1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is a detection terminal of the mode setting circuit, the 2 nd pin of the first chip U1 is connected to the other end of the first capacitor C1, and the connection terminal is a ground terminal of the mode setting circuit.
In this embodiment, as shown in fig. 2, the controllable voltage divider circuit includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6, the voltage-controlled voltage-dividing circuit comprises a seventh resistor R7 and a first diode D1, the first diode D1 is a voltage-stabilizing diode, one end of the third resistor R3 is a first control end of the controllable voltage-dividing circuit, one end of the fourth resistor R4 is a second control end of the controllable voltage-dividing circuit, the other end of the third resistor R3 is connected with one end of the sixth resistor R6, a connection end of the third resistor R6 is a first output end of the controllable voltage-dividing circuit, the other end of the fourth resistor R4 is connected with one end of the seventh resistor R7, a connection end of the fourth resistor R7 is a second output end of the controllable voltage-dividing circuit, the other end of the sixth resistor R6, the other end of the seventh resistor R7, one end of the fifth resistor R5 and a negative electrode of the first diode D1, the other end of the fifth resistor R5 is an input end of the controllable voltage-dividing resistor, and an anode of the first diode D.
In this embodiment, as shown in fig. 2, the dimmable constant current circuit includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a second capacitor C2, a third capacitor C3, a second chip U2, and a third chip U3, the model of the second chip U2 is SM088, the model of the third chip U3 is RM9012D, one end of the eighth resistor R8 is connected to one end of the ninth resistor R9, and a connection end thereof is an input end of the dimmable constant current circuit, the other end of the eighth resistor R8 is connected to the 1 st pin of the second chip U2, the 3 rd pin of the second chip U2, one end of the second capacitor C2, one end of the third capacitor C3, one end of the tenth resistor R10, one end of the eleventh resistor R11, one end of the twelfth resistor R12, one end of the third capacitor U3, and a bottom connection end of the third chip U3 is connected to the first pin of the constant current circuit U2, the 3 rd pin of the third chip U3 is connected with the other end of the third capacitor C3, and the connection end thereof is the second control end of the dimmable constant current circuit, the 2 nd pin of the third chip U3 is connected with the other end of the tenth resistor R10, the 4 th pin of the third chip U3 is connected with the other end of the eleventh resistor R11, the 5 th pin of the third chip U3 is the second output end of the dimmable constant current circuit, the 6 th pin of the third chip U3 is the first output end of the dimmable constant current circuit, the 8 th pin of the third chip U3 is connected with the other end of the ninth resistor R9, the 2 nd pin of the second chip U2 is connected with the other end of the twelfth resistor R12, and the connection end thereof is the ground end of the constant current dimmable constant current circuit.
In this embodiment, as shown in fig. 2, the rectifying circuit is implemented by using a full-bridge rectifier DB, the 1 st pin of the full-bridge rectifier DB is the live wire input end of the rectifying circuit, the 3 rd pin of the full-bridge rectifier DB is the zero line input end of the rectifying circuit, the 2 nd pin of the full-bridge rectifier DB is the output end of the rectifying circuit, and the 4 th pin of the full-bridge rectifier DB is the grounding end of the rectifying circuit.
In this embodiment, as shown in fig. 2, the first LED lighting circuit is formed by connecting n high color temperature LED luminaries in series, and the second LED lighting circuit is formed by connecting n low color temperature LED luminaries in series, where n is an integer greater than or equal to 1.
Claims (5)
1. A dimmable LED lamp circuit comprises a rectifying circuit for converting commercial power alternating current into direct current voltage for output, a first LED light-emitting circuit with high color temperature, a second LED light-emitting circuit with low color temperature and a dimmable constant current circuit, wherein the rectifying circuit is provided with a live wire input end, a zero wire input end, an output end and a grounding end, the first LED light-emitting circuit and the second LED light-emitting circuit are respectively provided with a positive pole and a negative pole, the dimmable constant current circuit is provided with an input end, a first control end, a second control end, a first output end, a second output end and a grounding end, the input end of the dimmable constant current circuit, the positive pole of the first LED light-emitting circuit and the positive pole of the second LED light-emitting circuit are all connected with the output end of the rectifying circuit and are connected with the direct current voltage output by the rectifying circuit, and the first output end of the dimmable constant current circuit is connected with the negative pole of the first LED, the second output end of the dimmable constant current circuit is connected with the negative electrode of the second LED light-emitting circuit, the first output end of the dimmable constant current circuit outputs a first path of current for controlling the light-emitting intensity of the first LED light-emitting circuit, the magnitude of the first path of current is adjusted by the voltage accessed by the first control end of the dimmable constant current circuit, the second output end of the dimmable constant current circuit outputs a second path of current for controlling the light-emitting intensity of the second LED light-emitting circuit, the magnitude of the second path of current is adjusted by the voltage accessed by the second control end of the dimmable constant current circuit, the dimmable LED lamp circuit is characterized by further comprising a mode setting circuit and a controllable voltage division circuit, the mode setting circuit is provided with a positive electrode, a detection end, a first control end, a second control end and a grounding end, the controllable voltage division circuit is provided with an input end, a first control end, a second control end, a first output end, a second output end and a grounding end, the detection end of the mode setting circuit is connected with the live wire input end or the zero wire input end of the rectifying circuit, the anode of the mode setting circuit and the input end of the controllable voltage division circuit are respectively connected with the output end of the rectifying circuit, the first control end of the mode setting circuit is connected with the first control end of the controllable voltage division circuit, the second control end of the mode setting circuit is connected with the second control end of the controllable voltage division circuit, the first output end of the controllable voltage division circuit is connected with the first control end of the dimmable constant current circuit, the second output end of the controllable voltage division circuit is connected with the second control end of the dimmable constant current circuit, the grounding end of the mode setting circuit, the grounding end of the controllable voltage division circuit, the grounding end of the dimmable constant current circuit and the grounding end of the rectifying circuit are connected;
the mode setting circuit is used for setting dimming and color mixing modes, the mode setting circuit can set three dimming and color mixing modes, at least one corresponding change relation of brightness and color temperature exists in each dimming and color mixing mode, and the three dimming and color mixing modes are as follows: when the light modulator is switched on, if the switch is first turned off and then turned on again within a set time, the mode setting operation is considered to be performed, and the corresponding change relationship between the brightness and the color temperature set by the mode setting circuit is switched once every time the mode setting operation is performed, when the mode setting operation is performed, if the corresponding change relationship between the brightness and the color temperature set by the mode setting circuit at present is the last corresponding change relationship between the brightness and the color temperature in a certain mode, at the moment, the corresponding change relationship between the brightness and the color temperature is switched to the corresponding change relationship between the first brightness and the color temperature in the next mode, otherwise, the corresponding change relationship between the brightness and the color temperature is adjusted to be the next corresponding change relationship between the brightness and the color temperature in the current mode, the corresponding change relationship between the brightness and the color temperature after switching is stored as the default relationship, when the corresponding change relationship between the brightness and the color temperature in the third dimming and color mixing mode is switched, the corresponding change relationship between the first brightness and the color temperature in the first mode is switched again when the mode setting operation is carried out, the corresponding change relationship between the first brightness and the color temperature in the first mode is repeatedly carried out, the first control end of the mode setting circuit outputs the corresponding first control voltage according to the current mode, the second control end of the mode setting circuit outputs the corresponding second control voltage according to the current mode, and the controllable voltage division circuit is respectively provided with the linear relationship between the first control end voltage and the voltage output by the first output end of the first control voltage and the linear relationship between the second control end voltage and the voltage output by the second output end of the second control voltage The output voltage of the first and second output ends of the controllable voltage division circuit respectively presents respective corresponding changes along with the effective voltage of the output end of the rectification circuit according to the voltage accessed from the output end of the mode setting circuit; according to the mode set by the mode setting circuit, the first output end of the controllable voltage division circuit outputs corresponding voltage to adjust the first path of current output by the first output end of the dimmable constant current circuit to adjust the brightness of the first LED light-emitting circuit, and the second output end of the controllable voltage division circuit outputs corresponding voltage to adjust the second path of current output by the second output end of the dimmable constant current circuit to adjust the brightness of the second LED light-emitting circuit, so that the color temperature setting is realized.
2. The dimmable LED lamp circuit according to claim 1, wherein the mode setting circuit comprises a first resistor, a second resistor, a first capacitor and a first chip, the first chip has a model number of S4223M, the 6 th pin of the first chip is the first control terminal of the mode setting circuit, the 1 st pin of the first chip is the second control terminal of the mode setting circuit, the 3 rd pin of the first chip is connected to one end of the second resistor, the other end of the second resistor is the positive electrode of the mode setting circuit, the 4 th pin of the first chip is connected to one end of the first capacitor, the 5 th pin of the first chip is connected to one end of the first resistor, the other end of the first resistor is the detection terminal of the mode setting circuit, the 2 nd pin of the first chip is connected to the other end of the first capacitor, and the connection terminal thereof is the mode setting circuit The grounding end of the circuit is arranged.
3. The dimmable LED lamp circuit according to claim 1, wherein the controllable voltage-dividing circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a first diode, the first diode is a zener diode, one end of the third resistor is the first control end of the controllable voltage-dividing circuit, one end of the fourth resistor is the second control end of the controllable voltage-dividing circuit, the other end of the third resistor is connected to one end of the sixth resistor, and the connection end thereof is the first output end of the controllable voltage-dividing circuit, the other end of the fourth resistor is connected to one end of the seventh resistor, and the connection end thereof is the second output end of the controllable voltage-dividing circuit, the other end of the sixth resistor, the other end of the seventh resistor, one end of the fifth resistor and the negative electrode of the first diode are connected, the other end of the fifth resistor is the input end of the controllable voltage-dividing resistor, and the anode of the first diode is the grounding end of the controllable voltage-dividing circuit.
4. The dimmable LED lamp circuit according to claim 1, wherein the dimmable constant current circuit includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second capacitor, a third capacitor, a second chip and a third chip, the model of the second chip is SM088, the model of the third chip is RM9012D, one end of the eighth resistor and one end of the ninth resistor are connected, a connection end of the eighth resistor and one end of the ninth resistor is an input end of the dimmable constant current circuit, the other end of the eighth resistor and the 1 st pin of the second chip are connected, the 3 rd pin of the second chip, one end of the second capacitor, one end of the third capacitor, one end of the tenth resistor, one end of the eleventh resistor, one end of the twelfth resistor and a bottom electrode of the third chip are connected, the 1 st pin of the third chip is connected with the other end of the second capacitor, and the connecting end of the third chip is the first control end of the dimmable constant current circuit, the 3 rd pin of the third chip is connected with the other end of the third capacitor, and the connecting end of the third chip is the second control end of the dimmable constant current circuit, the 2 nd pin of the third chip is connected with the other end of the tenth resistor, the 4 th pin of the third chip is connected with the other end of the eleventh resistor, the 5 th pin of the third chip is the second output end of the dimmable constant current circuit, the 6 th pin of the third chip is the first output end of the dimmable constant current circuit, the 8 th pin of the third chip is connected with the other end of the ninth resistor, the 2 nd pin of the second chip is connected with the other end of the twelfth resistor, and the connecting end of the second chip is the grounding end of the dimmable constant current circuit.
5. A dimmable LED lamp circuit according to claim 1, wherein the rectifying circuit is implemented by using a full-bridge rectifier bridge stack, the 1 st pin of the full-bridge rectifier bridge stack is the live wire input terminal of the rectifying circuit, the 3 rd pin of the full-bridge rectifier bridge stack is the zero wire input terminal of the rectifying circuit, the 2 nd pin of the full-bridge rectifier bridge stack is the output terminal of the rectifying circuit, and the 4 th pin of the full-bridge rectifier bridge stack is the ground terminal of the rectifying circuit.
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