CN107548188B - LED lamp, LED color temperature adjusting control chip and circuit - Google Patents
LED lamp, LED color temperature adjusting control chip and circuit Download PDFInfo
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Abstract
The invention belongs to the technical field of semiconductor integrated circuits, and discloses an LED lamp, an LED color temperature adjusting control chip and a circuit. In the invention, an LED color temperature adjusting control chip comprising a low-voltage detection module, a noise suppression module, a state storage module and a driving module is adopted, wherein the low-voltage detection module comprises a plurality of switching elements; the low-voltage detection module detects the output voltage of the rectification circuit and outputs a corresponding detection signal to the noise suppression module; the noise suppression module carries out filtering processing on the detection signal and then outputs the detection signal to the state storage module; the state storage module outputs corresponding state control signals to the driving module according to the times of receiving the filtered detection signals within preset time, and the driving module drives the constant current chips according to the state control signals so as to control the constant current chips.
Description
Technical Field
The invention belongs to the technical field of semiconductor integrated circuits, and particularly relates to an LED lamp, an LED color temperature adjusting control chip and a circuit.
Background
In recent years, LED lamps have been widely used as illumination power sources instead of conventional incandescent lamps, and with the improvement of requirements of people on LED illumination power sources and the development of LED technology, color temperature adjustable LED illumination power sources have become a new development trend.
At present, the existing LED color temperature adjusting control circuit mainly controls whether the constant current chip works or not through the color temperature adjusting control chip, so that the color temperature adjusting control of the LED lamp is realized. The prior color temperature adjusting control chip comprises a clock detection module, a noise suppression module, a state storage module and a driving module; the clock detection module detects the on-off state of an external power supply of the color temperature regulation control circuit, the noise suppression module carries out filtering processing on detection signals output by the clock detection module, and the state storage module outputs driving signals to drive the constant current chip according to the received filtered detection signals, so that the color temperature regulation control of the LED lamp is realized.
Although the color temperature adjustment control of the LED can be realized by the existing LED color temperature adjustment control circuit, the clock detection module in the color temperature adjustment control chip inside the LED is formed by cascading a plurality of clock detection chips, and the cost of each clock detection chip is relatively high and the volume is large, so that the volume of the color temperature adjustment control chip is relatively large and the cost is relatively high, and the volume of the existing LED color temperature adjustment control circuit is relatively large and the cost is high.
In summary, the existing LED color temperature adjustment control circuit has the problems of large volume and high cost.
Disclosure of Invention
The invention aims to provide an LED color temperature adjusting control chip, which aims to solve the problems of large volume and high cost of the existing LED color temperature adjusting control circuit.
The invention is realized in such a way, the LED color temperature adjusting control chip is used for driving the constant current chips to adjust the color temperature of the LED lamp strings, and comprises a noise suppression module, a state storage module and a driving module, wherein the noise suppression module is connected with the state storage module, and the state storage module is connected with the driving module; the LED color temperature adjusting control chip further comprises a low-voltage detection module;
The voltage input end of the low voltage detection module is connected with the output end of an external rectifying circuit, and the signal output end of the low voltage detection module is connected with the noise suppression module;
The low voltage detection module comprises a plurality of switching elements; the low-voltage detection module detects the output voltage of the rectification circuit and outputs a corresponding detection signal to the noise suppression module; the noise suppression module carries out filtering processing on the detection signal and then outputs the detection signal to the state storage module; the state storage module outputs corresponding state control signals to the driving module according to the times of receiving the filtered detection signals in preset time, and the driving module drives a plurality of constant current chips according to the state control signals.
Another object of the present invention is to provide an LED color temperature adjustment control circuit, where the LED color temperature adjustment control circuit includes a rectifying circuit, a sampling circuit, a charging capacitor, a plurality of constant current chips, a plurality of LED strings, and the LED color temperature adjustment control chip described above;
And the sampling circuit samples the output voltage of the rectifying circuit, and one constant current chip drives one LED lamp string.
Still another object of the present invention is to provide an LED lamp including the above LED color temperature adjustment control circuit.
In the invention, an LED color temperature adjusting control chip comprising a low-voltage detection module, a noise suppression module, a state storage module and a driving module is adopted, wherein the low-voltage detection module comprises a plurality of switching elements; the low-voltage detection module detects the output voltage of the rectification circuit and outputs a corresponding detection signal to the noise suppression module; the noise suppression module carries out filtering processing on the detection signal and then outputs the detection signal to the state storage module; the state storage module outputs corresponding state control signals to the driving module according to the times of receiving the filtered detection signals within preset time, and the driving module drives the constant current chips according to the state control signals so as to control the constant current chips, so that the LED color temperature adjusting control circuit comprising the LED color temperature adjusting control chip can realize color temperature adjustment of the LED lamp string, and the LED color temperature adjusting control circuit is simple in structure and low in cost, and further solves the problems of large volume and high cost of the existing LED color temperature adjusting control circuit.
Drawings
Fig. 1 is a schematic block diagram of an LED color temperature adjustment control chip according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of an LED color temperature adjustment control chip according to another embodiment of the present invention;
Fig. 3 is a schematic block diagram of an LED color temperature adjustment control chip according to another embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a low voltage detection module in an LED color temperature adjustment control chip according to an embodiment of the present invention;
Fig. 5 is a schematic circuit diagram of a power supply module in an LED color temperature adjustment control chip according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a reset module in an LED color temperature adjustment control chip according to an embodiment of the present invention;
Fig. 7 is a schematic circuit diagram of an LED color temperature adjustment control circuit according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of an LED color temperature adjustment control circuit according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The implementation of the invention is described in detail below with reference to the specific drawings:
Fig. 1 shows a module structure of an LED color temperature adjustment control chip according to an embodiment of the present invention, and for convenience of explanation, only the portions related to the embodiments of the present invention are shown in detail as follows:
In this embodiment, the LED color temperature adjustment control chip 10 is connected to a plurality of external constant current chips (not shown in the figure) for adjusting the color temperature of a plurality of LED strings (not shown in the figure) by a plurality of driving constant current chips. As shown in fig. 1, the LED color temperature adjustment control chip 10 provided in the embodiment of the present invention includes a low voltage detection module 100, a noise suppression module 101, a status storage module 102, and a driving module 103.
The noise suppression module 101 is connected to the state storage module 102, the state storage module 102 is connected to the driving module 103, the voltage input end of the low voltage detection module 100 is connected to the output end of an external rectifying circuit (not shown in the figure), and the signal output end of the low voltage detection module 100 is connected to the noise suppression module 101.
The low voltage detection module 100 includes a plurality of switching elements, and the low voltage detection module 100 detects an output voltage of the rectifying circuit and outputs a corresponding detection signal to the noise suppression module 101; the noise suppression module 101 performs filtering processing on the detection signal and outputs the detection signal to the state storage module 102; the state storage module 102 outputs a corresponding state control signal to the driving module 103 according to the number of times of receiving the filtered detection signal in a preset time; the driving module 103 drives the plurality of constant current chips according to the state control signal.
Specifically, when the rectifying circuit does not output voltage, the output voltage received by the voltage input end of the low voltage detection module 100 is zero, so that the output of the low voltage detection module 100 is zero, and the back-end noise suppression module 101, the state storage module 102 and the driving module 103 do not work; when the rectifying circuit outputs voltage, the low-voltage detection module 100 detects the output voltage of the rectifying circuit and outputs a detection signal to the noise suppression module 101, and the noise suppression module 101 performs filtering processing on the detection signal and outputs the detection signal to the state storage module 102; the state storage module 102 outputs corresponding state control signals to the driving module 103 according to the times of the received detection signals after the filtering processing within a preset time, and the driving module 103 drives a plurality of constant current chips according to the state control signals.
It should be noted that, as a preferred embodiment of the present invention, when there are two external constant current chips, as shown in fig. 2, the LED color temperature adjustment control chip 10 provided in this embodiment further includes a switching tube M1 and a switching tube M2, where a control end of the switching tube M1 and a control end of the switching tube M2 are both connected to an output end of the driving module 103, an input end of the switching tube M1 is connected to the external first constant current chip, an output end of the switching tube M1 is grounded, an input end of the switching tube M2 is connected to the external second constant current chip, and an output end of the switching tube M2 is grounded; when the driving module 103 receives the state control signal sent by the state storage module 102, the driving module 103 sends a corresponding driving signal to the switching tube M1 and the switching tube M2 according to the state control signal, and the switching tube M1 and the switching tube M2 respectively control the first constant current chip and the second constant current chip to work according to the corresponding driving signal.
In this embodiment, since the state storage module 102 updates the storage state thereof every time the detection signal is received, and outputs a corresponding state control signal according to the updated storage state, when the state storage module 102 receives the detection signal for multiple times within a preset time, the state storage module 102 can output a corresponding state control signal according to the number of times of receiving the detection signal; in addition, the detection signal output by the low voltage detection module 100 is a high level signal, and the state control signal output by the state storage module 102 includes, but is not limited to, a high-low level signal.
Further, as shown in fig. 2, the low voltage detection module 100 includes a control unit 100a and a detection signal generation unit 100b.
The input end of the control unit 100a and the input end of the detection signal generating unit 100b are commonly connected to form a voltage input end of the low voltage detection module 100, the output end of the control unit 100a is connected to the control end of the detection signal generating unit 100b, and the output end of the detection signal generating unit 100b is a signal output end of the low voltage detection module 100.
Specifically, the control unit 100a detects the output voltage of the rectifying circuit, and outputs a corresponding control signal to the detection signal generating unit 100b, and the detection signal generating unit 100b generates a corresponding detection signal according to the control signal.
Further, as a preferred embodiment of the present invention, as shown in fig. 4, the control unit 100a includes a first switching element Q1, a second switching element Q2, a third switching element Q3, a fourth switching element Q4, a fifth switching element Q5, a sixth switching element Q6, a seventh switching element Q7, an eighth switching element Q8, a ninth switching element Q9, a tenth switching element Q10, an eleventh switching element Q11, a twelfth switching element Q12, a thirteenth switching element Q13, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first diode D1, a second diode D2, and a third diode D3.
The input terminal of the first switching element Q1, the first terminal of the first resistor R1, the input terminal of the seventh switching element Q7, and the first terminal of the fifth resistor R5 are commonly connected to form an input terminal of the control unit 100 a; the control end and the output end of the first switching element Q1 are commonly connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the input end of the second switching element Q2, the control end and the output end of the second switching element Q2 are commonly connected with the input end of the third switching element Q3, the control end and the output end of the third switching element Q3 are commonly connected with the input end of the fourth switching element Q4, the control end and the output end of the fourth switching element Q4 are commonly connected with the input end of the fifth switching element Q5, the control end and the output end of the fifth switching element Q5 are commonly connected with the cathode of the first diode D1, the anode of the first diode D1 is connected with the cathode of the second diode D2, the anode of the second diode D2 is connected with the first end of the second resistor R2, the anode of the third diode D3, the control end of the thirteenth switching element Q13 and the input end and the control end of the twelfth switching element Q12, the second end of the second resistor R2 is connected with the first end of the third resistor R3 and the input end of the sixth switching element Q6, the second end of the third resistor R3 and the output end of the sixth switching element Q6 are commonly connected with the ground, the control end of the seventh switching element Q7 is connected with the second end of the fifth resistor R5 and the first end of the sixth resistor R6, the output end of the seventh switching element Q7 is connected with the input end of the eighth switching element Q8, the output end and the control end of the eighth switching element Q8 are commonly connected with the input end of the ninth switching element Q9, the output end and the control end of the ninth switching element Q9 are commonly connected with the output end of the tenth switching element Q10, the output end and the control end of the tenth switching element Q10 are commonly connected with the input end of the eleventh switching element Q11, the output end and the control end of the eleventh switching element Q11 are commonly connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected with the cathode of the third diode D3, the output terminal of the twelfth switching element Q12 and the output terminal of the thirteenth switching element Q13 are commonly connected to the ground, and the input terminal of the thirteenth switching element Q13 and the second terminal of the sixth resistor R6 are commonly connected to form the output terminal of the control unit 100 a.
Further, as a preferred embodiment of the present invention, as shown in fig. 4, the detection signal generation unit 100b includes a fourteenth switching element Q14, a fifteenth switching element Q15, a sixteenth switching element Q16, a seventeenth switching element Q17, an eighteenth switching element Q18, a nineteenth switching element Q19, a twentieth switching element Q20, a twenty first switching element Q21, a twenty second switching element Q22, and a twenty third switching element Q23.
Specifically, the control terminal of the fourteenth switching element Q14, the control terminal of the fifteenth switching element Q15, the control terminal of the sixteenth switching element Q16, and the control terminal of the seventeenth switching element Q17 are commonly connected to form the control terminal of the detection signal generation unit 100b, the input terminal of the fourteenth switching element Q14, the input terminal of the twenty-first switching element Q20, and the input terminal of the twenty-second switching element Q22 are commonly connected to form the input terminal of the detection signal generation unit 100b, the output terminal of the fourteenth switching element Q14 is connected to the input terminal of the fifteenth switching element Q15 and the input terminal of the eighteenth switching element Q18, the output terminal of the fifteenth switching element Q15, the control terminal of the eighteenth switching element Q18, the input terminal of the sixteenth switching element Q16, the control terminal of the nineteenth switching element Q19, the control terminal of the twenty-first switching element Q20, and the control terminal of the twenty-first switching element Q21 are commonly connected to the input terminal of the seventeenth switching element Q17, the output terminal of the twenty-first switching element Q17 is connected to the output terminal of the twenty-first switching element Q23, the twenty-first switching element Q23 is commonly connected to the output terminal of the twenty-first switching element Q23, and the twenty-second switching element Q23 is commonly connected to the output terminal of the twenty-first switching element Q23, and the twenty-first switching element Q23 is commonly connected to the output terminal of the twenty-first switching element Q16.
In this embodiment, the first switching element Q1, the second switching element Q2, the third switching element Q3, the fourth switching element Q4, the fifth switching element Q5, the seventh switching element Q7, the eighth switching element Q8, the ninth switching element Q9, the tenth switching element Q10, the eleventh switching element Q11, the fourteenth switching element Q14, the fifteenth switching element Q15, the eighteenth switching element Q18, the twentieth switching element Q20 and the twenty-first switching element Q21 are PMOS transistors, and the gate, the source and the drain of the PMOS transistors are the first switching element Q1, the second switching element Q2, the third switching element Q3, the fourth switching element Q4, the fifth switching element Q5, the seventh switching element Q7, the eighth switching element Q8, the ninth switching element Q9, the tenth switching element Q10, the eleventh switching element Q11, the fourteenth switching element Q14, the fifteenth switching element Q15, the eighteenth switching element Q18, the twenty-first switching element Q20 and the twenty-first switching element Q21, respectively.
The sixth switching element Q6, the twelfth switching element Q12, the thirteenth switching element Q13, the sixteenth switching element Q16, the seventeenth switching element Q17, the nineteenth switching element Q19, the twenty first switching element Q21, and the twenty third switching element Q23 are NMOS transistors each having a gate, a drain, and a source of the NMOS transistor respectively corresponding to the control terminal, the input terminal, and the output terminal of the sixth switching element Q6, the twelfth switching element Q12, the thirteenth switching element Q13, the sixteenth switching element Q16, the seventeenth switching element Q17, the nineteenth switching element Q19, the twenty first switching element Q21, and the twenty third switching element Q23.
Further, fig. 3 shows a module structure of an LED color temperature adjustment control chip according to another embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown, which is described in detail below:
As shown in fig. 3, the LED color temperature adjustment control chip 20 in this embodiment is added with a power supply module 104 and a reset module 105 on the basis of the LED color temperature adjustment control chip 10 in fig. 2; the voltage input end of the power supply module 104 is connected with the output end of the rectifying circuit, the voltage output end of the power supply module 104 is connected with the voltage input end of the reset module 105 and an external charging capacitor (not shown in the figure), and the signal output end of the reset module 105 is connected with the state storage module 102.
When the rectifying circuit has voltage output, the power supply module 104 performs voltage conversion on the output voltage of the rectifying circuit to output a reset working voltage to charge the charging capacitor, and meanwhile outputs the reset working voltage to the reset module 105, and the reset module 105 outputs a state maintaining signal to the state storage module 102 according to the reset working voltage, so that the state storage module 102 maintains a self-storage state according to the state maintaining signal; when the rectifying circuit has no voltage output, the charging capacitor discharges to the reset module 105, and when the charging capacitor finishes discharging, the reset module 105 outputs a state reset signal to the state storage module 102, so that the state storage module 102 performs reset processing on the self-storage state according to the state reset signal.
Further, as a preferred embodiment of the present invention, as shown in fig. 5, the power supply module 104 includes a twenty-fourth switching element Q24, a twenty-fifth switching element Q25, a twenty-sixth switching element Q26, a twenty-seventh switching element Q27, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a fourth diode D4.
The input terminal of the twenty-fourth switching element Q24, the first terminal of the seventh resistor R7, and the first terminal of the ninth resistor R9 are commonly connected to form a voltage input terminal of the power supply module 104, the control terminal of the twenty-fourth switching element R24 is connected to the second terminal of the seventh resistor R7 and the first terminal of the eighth resistor R8, the output terminal of the twenty-fourth switching element Q24 is commonly connected to the output terminal of the twenty-fifth switching element Q25 and the input terminal and the output terminal of the twenty-seventh switching element Q27, the second terminal of the eighth resistor R8 is commonly connected to the control terminal of the twenty-sixth switching element Q26 and the cathode of the fourth diode D4, the anode of the fourth diode D4 is connected to the control terminal and the input terminal of the twenty-sixth switching element Q25, the second terminal of the ninth resistor R9 is connected to the input terminal of the twenty-sixth switching element Q26, and the output terminal of the twenty-sixth switching element Q26 is commonly connected to the control terminal of the twenty-seventh switching element Q2Q7 to form a voltage output terminal of the power supply module 104.
In this embodiment, the fourth switching element Q24 is a PMOS transistor, and the gate, source and drain of the PMOS transistor are the control end, input end and output end of the fourth switching element Q24 respectively; the twenty-fifth switching element Q25, the twenty-sixth switching element Q26, and the twenty-seventh switching element Q27 are NMOS transistors, and the gate, the drain, and the source of the NMOS transistors are control terminals, input terminals, and output terminals of the twenty-fifth switching element Q25, the twenty-sixth switching element Q26, and the twenty-seventh switching element Q27, respectively.
Further, as a preferred embodiment of the present invention, as shown in fig. 6, the reset module 105 includes a twenty-eighth switching element Q28, a twenty-ninth switching element Q29, a thirty-first switching element Q30, a thirty-second switching element Q32, a thirty-third switching element Q33, a thirty-fourth switching element Q34, a thirty-fifth switching element Q35, a thirty-sixth switching element Q36, a thirty-seventh switching element Q37, a thirty-eighth switching element Q38, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13.
Wherein the first end of the tenth resistor R10, the input end of the twenty-eighth switching element Q28, the first end of the thirteenth resistor R13, the input end of the thirty-first switching element Q31, the input end of the thirty-third switching element Q33 and the input end of the thirty-eighth switching element Q38 are commonly connected to form a voltage input end of the reset module 105, the second end of the tenth resistor R10 is connected with the first end of the eleventh resistor R11 and the output end of the twenty-eighth switching element Q28, the second end of the eleventh resistor R11 is connected with the first end of the twelfth resistor R12, the control end of the thirty-second switching element Q30 and the control end of the twenty-ninth switching element Q29, the control end of the twenty-eighth switching element Q28 is connected with the second end of the thirteenth resistor R13, the input end of the thirty-first switching element Q30, the control end of the thirty-first switching element Q31 and the control end of the thirty-second switching element Q32, the output end of the thirty-first switching element Q30 is connected with the input end of the twenty-ninth switching element Q29, the output end of the thirty-second switching element Q32, the output end of the thirty-fifth switching element Q35, the output end of the thirty-sixth switching element Q36 and the output end of the thirty-seventh switching element Q37, the output end of the thirty-first switching element Q31, the input end of the thirty-second switching element Q32, the control end of the thirty-third switching element Q33, the control end of the thirty-fourth switching element Q34 and the control end of the thirty-fifth switching element Q35 are connected together, the output end of the thirteenth switching element Q33, the input end of the thirty-fourth switching element Q34, the control end of the thirty-sixth switching element Q36, the control end of the thirty-seventh switching element Q37 and the control end of the thirty-eighth switching element Q38 are connected together, an output terminal of the thirty-fourth switching element Q34 is connected to an input terminal of the thirty-fifth switching element Q35, and an output terminal of the thirty-eighth switching element Q38 and an input terminal of the thirty-seventh switching element Q37 are commonly connected to form a signal output terminal of the reset module 105.
In the present embodiment, the twenty eighth switching element Q28, the thirty first switching element Q31, the thirty third switching element Q33 and the thirty eighth switching element Q38 are PMOS transistors, and the gate, the source and the drain of the PMOS transistors are the control terminal, the input terminal and the output terminal of the PMOS transistors respectively; the twenty-ninth switching element Q29, the thirty-ninth switching element Q30, the thirty-first switching element Q31, the thirty-fourth switching element Q34, the thirty-fifth switching element Q35, the thirty-sixth switching element Q36, and the thirty-seventh switching element Q37 are all NMOS transistors, and the gate, the drain, and the source of the NMOS transistors are the control terminals, the input terminals, and the output terminals of the twenty-ninth switching element Q29, the thirty-first switching element Q30, the thirty-first switching element Q31, the thirty-fourth switching element Q34, the thirty-fifth switching element Q35, the thirty-sixth switching element Q36, and the thirty-seventh switching element Q37, respectively.
The following describes the working principle of the LED color temperature adjustment control chip provided in the embodiment of the present invention in detail by taking the circuit structures shown in fig. 4, 5 and 6 and the module structure shown in fig. 3 as an example, and the details are as follows:
first, this embodiment is described in detail in the case where there are two external constant current chips.
Further, as shown in fig. 4, when no voltage is output from the external rectifying circuit, the output voltage VCC received by the voltage input terminal of the low voltage detection module 100 is zero, and thus the output of the low voltage detection module 100 is zero, and thus the noise suppression module 101, the state storage module 102, and the driving module 103 at the rear end do not operate.
When the external rectifying circuit has voltage output, the first switching element Q1 is turned off, the second switching element Q2, the third switching element Q3, the fourth switching element Q4, and the fifth switching element Q5 are all turned on, and therefore, the first resistor R1, the second switching element Q2, the third switching element Q3, the fourth switching element Q4, the fifth switching element Q5, the first diode D1, the second diode D2, the second resistor R2, and the third resistor R3 form a path, and when the node voltage of the common junction of the second resistor R2 and the second diode D2 is greater than the gate voltage of the thirteenth switching element Q13, the thirteenth switching element Q13 is turned on, and since the gate voltage of the seventh switching element Q7 is high, the seventh switching element Q7 is turned off, and thus the seventh switching element Q7, the eighth switching element Q8, the ninth switching element Q9, the tenth switching element Q10, the eleventh switching element Q11, the fourth resistor R4, and the third diode D3 are kept unable to form a path Q13; when the thirteenth switching element Q13 is turned on, gate voltages of the fourteenth switching element Q14, the fifteenth switching element Q15, the sixteenth switching element Q16, and the seventeenth switching element Q17 are pulled down, so that the fourteenth switching element Q14 and the fifteenth switching element Q15 are turned on, and the sixteenth switching element Q16 and the seventeenth switching element Q17 are turned off. When the fourteenth switching element Q14 and the fifteenth switching element Q15 are turned on and the sixteenth switching element Q16 and the seventeenth switching element Q17 are turned off, the gate of the eighteenth switching element Q18, the gate of the nineteenth switching element Q19, the gate of the twentieth switching element Q20, and the gate of the twenty first switching element Q21 are all at a high level, so the eighteenth switching element Q18 is turned off and the nineteenth switching element Q19 is turned on, but since the sixteenth switching element Q16 and the seventeenth switching element Q17 are turned off, the nineteenth switching element Q19 is turned on and does not affect the gate voltage of the twentieth switching element Q20 and the gate voltage of the twenty first switching element Q21, so the twenty second switching element Q22 is turned on, the twenty third switching element Q23 is turned off, and the twenty first switching element Q22 outputs a high level signal, which is the detection signal outputted by the low voltage detection module 100.
After the twenty-second switching element Q22 outputs the high-level signal, the noise suppression module 101 receives the detection signal, filters the detection signal, and sends the detection signal to the state storage module 102, and the state storage module 102 outputs a corresponding control signal to the driving module 103 according to the number of times of the detection signal received in a preset time, so that the driving module 103 outputs a corresponding driving signal to the switching tube M1 and the switching tube M2 according to the state control signal, and further the switching tube M1 and the switching tube M2 control to control the first constant current chip and the second constant current chip respectively according to the corresponding driving signal.
Further, whether the output voltage of the rectifying circuit is related to the state of an external power switch or not, and when the external power switch is turned on, the rectifying circuit does not output voltage; when the external power switch is turned off, the rectification circuit outputs a voltage, so that the low voltage detection module 100 outputs a detection signal, therefore, the number of times of the detection signal received by the state storage module 102 in a preset time is the number of times of the power switch being turned off, when the power switch is turned off once, the state of the state storage module 102 is updated once, when the state storage module 102 updates the state once, the state storage module outputs a state control signal once, and the state control signal output each time is different; in addition, when the state of the state storage module 102 is updated to the preset number of times, the state storage module 102 returns to the first state, and it should be noted that the preset number of times is determined according to the number of external LED strings, and when the number of external LED strings is n, the preset number of times is 2 n, for example, when the number of external LED strings is 2, the preset number of times is 4; in addition, the preset time can be set according to the needs of users.
Specifically, taking two LED strings in the LED lamps as an example, when the power switch is turned on for the first time, the state storage module 102 outputs a first state control signal, and records the storage state of itself as 1; the driving module 103 outputs a first driving signal to the switching tube M1 and the switching tube M2 according to a first state control signal, wherein the first driving signal is that a first output end of the driving module 103 is at a high level, and a second output end of the driving module is at a low level, so that the switching tube M1 is conducted according to the high level signal, and the switching tube M2 is cut off according to the low level signal, so that the first constant current chip does not work, and the second constant current chip works, and the first color temperature adjustment of the LED lamp is realized; when the power switch is closed for the second time, the state storage module 102 outputs a second state control signal and marks the storage state of the state storage module as 2; the driving module 103 outputs a second driving signal to the switching tube M1 and the switching tube M2 according to a second state control signal, wherein the second driving signal is that a first output end of the driving module 103 is in a low level, a second output end of the driving module is in a high level, so that the switching tube M1 is cut off according to the low level signal, and the switching tube M2 is conducted according to the high level signal, so that the first constant current chip works, and the second constant current chip does not work, and the second color temperature adjustment of the LED lamp is realized; when the power switch is turned on for the third time, the state storage module 102 outputs a third state control signal and marks the storage state of the state storage module as 3; the driving module 103 outputs a third driving signal to the switching tube M1 and the switching tube M2 according to a third state control signal, wherein the third driving signal can be that a first output end of the driving module 103 is at a high level, and a second output end of the driving module 103 is at a high level, so that the switching tube M1 is conducted according to the high level signal, and the switching tube M2 is conducted according to the high level signal, so that the first constant current chip works and the second constant current chip works, and third color temperature adjustment of the LED lamp is realized; when the power switch is turned on for the fourth time, the state storage module 102 is restored to the first state, and the working process is the same as that when the power switch is turned on for the first time, which is not described herein.
Further, as shown in fig. 5 and fig. 6, when the rectifying circuit has voltage output, the twenty-fourth switching element Q24 is turned off, the output voltage VCC of the rectifying circuit is output to the gate of the twenty-sixth switching element Q26 through the seventh resistor R7 and the eighth resistor R8, the twenty-sixth switching element Q26 is turned on, and the output voltage VCC is further converted to output the reset operating voltage VDD to charge the external charging capacitor, and meanwhile, the reset operating voltage is output to the reset module 105; when the reset module 105 receives the reset operation voltage, the twenty-eighth switching element Q28 is turned off, and the reset operation voltage VDD is output to the gate of the twenty-ninth switching element Q29 and the gate of the thirty-ninth switching element Q30 via the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12 to turn on the twenty-ninth switching element Q29 and the thirty-eighth switching element Q30; the reset operating voltage VDD is output to the gate of the thirty-first switching element Q31 and the gate of the thirty-second switching element Q32 through the thirteenth resistor R13, and since the thirty-first switching element Q30 is turned on, the thirty-first switching element Q31 and the thirty-second switching element Q32 are pulled down by the thirty-first switching element Q30 to turn on the thirty-first switching element Q31, the thirty-second switching element Q32 is turned off to turn off the thirty-third switching element Q33, the thirty-fourth switching element Q34 and the thirty-fifth switching element Q35 are turned on to turn off the thirty-sixth switching element Q36 and the thirty-seventh switching element Q37, and the thirty-eighth switching element Q38 is turned on to enable the output terminal of the reset module 105 to output a high level signal to the state storage module 102, so that the state storage module 102 maintains its own storage state according to the high level signal.
When the rectifying circuit has no voltage output, that is, the external power switch is turned off and the turn-off time is short, the output of the power supply module 104 is zero, the charging capacitor discharges to the reset module 105 to provide voltage to the reset module 105, the reset module 105 works according to the voltage, and the working process of the reset module is the same as the process of receiving the reset working voltage output by the power supply module 104 and then starting to work, and the details are not repeated here; when the external power switch is turned off for a longer time, the charging capacitor is completely discharged, and the working voltage received by the reset module 105 is zero, so that the twenty-eighth switching element Q28 is turned on and the thirty-first switching element Q31 is turned on, and the twenty-ninth switching element Q29 and the thirty-first switching element Q30 are turned off; when the thirty-first switching element Q31 is turned on, the thirty-third switching element Q33 is turned on, and the thirty-fourth switching element Q34 and the thirty-fifth switching element Q35 are turned off, so that the thirty-sixth switching element Q36 and the thirty-seventh switching element Q37 are turned off, and the thirty-eighth switching element Q38 is turned on, so that the reset module 105 outputs a low level signal to the state storage module 102, that is, the reset module 105 outputs a state reset signal to the state storage module 102, so that the state storage module 102 performs storage state reset according to the state reset signal.
It should be noted that, in this embodiment, when the power switch is turned on once, the storage state of the state storage module 102 is changed once, and when the power switch is turned on for a plurality of times within a preset time, the storage state of the state storage module 102 is changed for a plurality of times within the preset time; in addition, since the power supply voltage of the reset module 105 is provided by the power supply module 104 and the external charging capacitor, when the power switch is turned off, but the off time does not exceed the discharging time of the charging capacitor, the reset module 105 sends a state maintaining signal to the state storage module 102, so that the state storage module 102 maintains its current storage state within a preset time, and the current storage state refers to the storage state when the power switch is turned on for the nth time; when the power switch is turned off and the turn-off time exceeds the discharging completion time of the charging capacitor, the reset module 105 sends a state reset signal to the state storage module 102, so that the state storage module 102 performs state reset according to the loading reset signal; in addition, the preset time is equal to the discharging completion time of the charging capacitor.
In the invention, the LED color temperature adjustment control chip 10 or 20 comprising the low-voltage detection module 100, the noise suppression module 101, the state storage module 102 and the driving module 103 which comprise a plurality of switching elements is used for controlling a plurality of constant current chips, so that the plurality of constant current chips control a plurality of corresponding LED lamp strings to realize the color temperature adjustment of the LED lamp strings, and the low-voltage detection module 100 has the advantages of simple structure, small size and low cost of an element device, so that the LED color temperature adjustment control chip 10 or 20 provided by the embodiment of the invention has the advantages of simple structure, small size and low cost.
Further, fig. 7 shows a circuit structure of an LED color temperature adjustment control circuit according to an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown in detail as follows:
In this embodiment, the LED color temperature adjustment control circuit 30 includes a rectifying circuit 300, a sampling circuit 301, a charging capacitor C2, a plurality of constant current chips, a plurality of LED strings, and the LED color temperature adjustment control chip 10 or 20 described above, and the sampling circuit 301 samples the output voltage of the rectifying circuit 300, and one constant current chip drives one LED string; in this embodiment, the number of the constant current chips and the LED strings is two, that is, the LED color temperature adjustment control circuit 30 includes a first constant current chip 302, a second constant current chip 303, a first LED string 304, and a second LED string 305.
Specifically, the input end of the rectifying circuit 300 is connected to an external ac power supply, the output end of the rectifying circuit 300 is connected to the input end of the sampling circuit 301, the voltage input end vcc of the first constant current chip 302, the voltage input end vcc of the second constant current chip 303, the positive end of the first LED string 304 and the positive end of the second LED string 305, the first output end of the sampling circuit 301 is connected to the voltage input end vcc of the LED color temperature adjustment control chip 10 or 20, the second output end of the sampling circuit 301 is commonly grounded to the second end of the charging capacitor C2, the first signal output end d1 of the LED color temperature adjustment control chip 10 or 20 is connected to the voltage input end vcc of the first constant current chip 302, the second signal output end d2 of the LED color temperature adjustment control chip 10 or 20 is connected to the voltage input end vcc of the second constant current chip 303, the voltage output end vdd of the LED color temperature adjustment control chip 10 or 20 is connected to the first end of the charging capacitor C2, the first output end dr of the first constant current chip 302 is commonly grounded to the second end dr of the first constant current chip 302, and the second output end dr of the second constant current chip is commonly grounded to the first end of the second constant current chip 303.
It should be noted that, in this embodiment, the sampling circuit 301 is composed of a resistor R14, a resistor R15, and a resistor R16, the first end of the resistor R14 is an input end of the sampling circuit 301, the second end of the resistor R14 is connected with the first end of the resistor R15, the second end of the resistor R15 and the first end of the resistor R16 are commonly connected to form a first output end of the sampling circuit 301, and the second end of the resistor R16 is a second output end of the sampling circuit 301; in addition, in the present embodiment, the first LED string 304 includes a diode D7, the cathode and the anode of the diode D7 are the negative terminal and the positive terminal of the first LED string 304, respectively, the second LED string 305 includes a diode D8, and the cathode and the anode of the diode D8 are the positive terminal and the negative terminal of the second LED string 305, respectively; in other embodiments, the first LED string 304 and the second LED string 305 each include, but are not limited to, one diode, and a plurality of diodes may be connected in series or in parallel.
Further, the LED color temperature adjustment control circuit 30 provided by the present invention further includes a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a capacitor C1, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a diode D5, a diode D6, a first inductor L1, a second inductor L2, a switching tube M3, and a switching tube M4.
The first end of the capacitor C1 is connected to the output end of the rectifying circuit 300, the second end of the capacitor C1 is grounded, the first end of the resistor R17, the cathode of the diode D5, the first end of the capacitor C5 and the first end of the resistor R20 are commonly connected to the output end of the rectifying circuit 300, the second end of the resistor R17 is connected to the first end of the resistor R18, the second end of the resistor R18 and the first end of the capacitor C3 are commonly connected to the voltage input end vcc of the first constant current chip 302, the second end of the capacitor C3 and the ground end gnd of the first constant current chip 302 are commonly connected to ground, the anode of the diode D5 is commonly connected to the input end of the switch tube M3 and the first end of the first inductor L1, the second end of the first inductor L1 is commonly connected to the second end of the capacitor C5 and the second end of the resistor R20, the control end of the switch tube M3 is connected to the first output end of the first constant current chip 302, the output end cs of the switch tube M3 is commonly connected to the second output end cs of the first constant current chip 302 and the resistor R19 is commonly connected to the first end R19.
In addition, the first end of the resistor R21, the cathode of the diode D6, the first end of the capacitor C6, and the first end of the resistor R24 are commonly connected to the output end of the rectifying circuit 300, the second end of the resistor R21 is connected to the first end of the resistor R22, the second end of the resistor R22 is commonly connected to the voltage input end vcc of the second constant current chip 303 with the first end of the capacitor C4, the second end of the capacitor C4 is commonly connected to the ground terminal gnd of the second constant current chip 303, the anode of the diode D6 is commonly connected to the input end of the switching tube M4 and the first end of the second inductor L2, the second end of the second inductor L2 is commonly connected to the second end of the capacitor C6 and the second end of the resistor R24, the control end of the switching tube M4 is commonly connected to the first output end dr of the second constant current chip 303, the second output end cs of the switching tube M4 is commonly connected to the first end of the resistor R23, and the second end of the resistor R23 is grounded.
Specifically, when the power switch is turned on for the first time, the rectifying circuit 300 outputs a voltage to the voltage input terminal vcc of the LED color temperature adjustment control chip 10 or 20, and outputs the voltage to the voltage input terminal vcc of the first constant current chip 302 through the resistor R17 and the resistor R18, and outputs the voltage to the voltage input terminal vcc of the second constant current chip 303 through the resistor R21 and the resistor R22; when the LED color temperature adjustment control chip 10 or 20 receives the output voltage of the rectifying circuit 300, the LED color temperature adjustment control chip 10 or 20 pulls down the voltage of the voltage input end vcc of the first constant current chip 302, so that the first constant current chip 302 does not work, the switching tube M3 is turned off, so that the first LED string 304 has no path, the first LED string 304 does not emit light, and the LED color temperature adjustment control chip 10 or 20 maintains the voltage of the voltage input end vcc of the second constant current chip 303, so that the second constant current chip 303 works, the switching tube M4 is turned on, so that the second LED string 305 can form a path through the second inductor L2 and the switching tube M4, and the second LED string 305 emits light, thereby realizing the first color temperature adjustment of the LED lamps.
When the power switch is turned on for the second time, the rectifying circuit 300 outputs a voltage to the voltage input terminal vcc of the LED color temperature adjustment control chip 10 or 20, and outputs the voltage to the voltage input terminal vcc of the first constant current chip 302 through the resistor R17 and the resistor R18, and outputs the voltage to the voltage input terminal vcc of the second constant current chip 303 through the resistor R21 and the resistor R22; when the LED color temperature adjustment control chip 10 or 20 receives the output voltage of the rectifying circuit 300, the LED color temperature adjustment control chip 10 or 20 pulls down the voltage of the voltage input end vcc of the second constant current chip 303, so that the second constant current chip 303 does not work, the switching tube M4 is turned off, so that the second LED string 305 has no path, the second LED string 305 does not emit light, and the LED color temperature adjustment control chip 10 or 20 maintains the voltage of the voltage input end vcc of the first constant current chip 302, so that the first constant current chip 302 works, the switching tube M3 is turned on, so that the first LED string 304 can form a path through the first inductor L1 and the switching tube M3, and the first LED string 304 emits light, thereby realizing the second color temperature adjustment of the LED lamps.
When the power switch is turned on for the third time, the rectifying circuit 300 outputs a voltage to the voltage input terminal vcc of the LED color temperature adjustment control chip 10 or 20, and outputs the voltage to the voltage input terminal vcc of the first constant current chip 302 through the resistor R17 and the resistor R18, and outputs the voltage to the voltage input terminal vcc of the second constant current chip 303 through the resistor R21 and the resistor R22; when the LED color temperature adjustment control chip 10 or 20 receives the output voltage of the rectifying circuit 300, the LED color temperature adjustment control chip 10 or 20 maintains the high voltage of the voltage input end vcc of the second constant current chip 303, so that the second constant current chip 303 works, the switching tube M4 is turned on, so that the second LED lamp string 305 forms a passage through the second inductor L2 and the switching tube M4, so that the second LED lamp string 305 emits light, and the LED color temperature adjustment control chip 10 or 20 maintains the high voltage of the voltage input end vcc of the first constant current chip 302, so that the first constant current chip 302 works, the switching tube M3 is turned on, so that the first LED lamp string 304 can form a passage through the first inductor L1 and the switching tube M3, and the first LED lamp string 304 emits light, so as to realize the third color temperature adjustment of the LED lamps; since the working process of the LED color temperature adjustment control circuit 30 when the power switch is turned on for the fourth time is the same as the working process when the power switch is turned on for the first time, the working process of the LED color temperature adjustment control circuit 30 when the power switch is turned on for the fourth time can refer to the working process when the power switch is turned on for the first time, and will not be described herein.
It should be noted that, since the sampling point of the sampling circuit 301 of the LED color temperature adjustment control circuit 30 provided in this embodiment is at the output end of the rectifying circuit 300, the LED color temperature adjustment control circuit 30 provided in this embodiment does not need to set a schottky diode at the input end of the sampling circuit 301, thereby reducing the cost of the LED color temperature adjustment control circuit 30.
Further, fig. 8 shows a circuit structure of an LED color temperature adjustment control circuit 30 according to another embodiment of the present invention, and for convenience of explanation, only the portions related to the embodiment of the present invention are shown in detail as follows:
as shown in fig. 8, the LED color temperature adjustment control circuit 30 in this embodiment is formed by adding a diode D based on the LED color temperature adjustment control circuit 30 in fig. 7, the anode of the diode D is connected to the output end of the rectifying circuit 300, and the cathode of the diode D is connected to the first end of the capacitor C1, and since the LED color temperature adjustment control circuit 30 in this embodiment is formed by adding a diode D based on the LED color temperature adjustment control circuit 30 in fig. 7, the operation process is the same as that of the LED color temperature adjustment control circuit 30 in fig. 7, and detailed description thereof will be omitted.
Further, an embodiment of the present invention further provides an LED lamp, which includes the above-mentioned LED color temperature adjustment control circuit 30.
In the embodiment of the invention, by adopting the LED color temperature adjustment control chip 10 or 20 including the low voltage detection module 100, the rectifying circuit 300, the first constant current chip 302, the second constant current chip 303, the first LED string 304 and the LED color temperature adjustment control circuit 30 of the second LED string 305, the LED color temperature adjustment control chip 10 or 20 outputs different driving signals to the first constant current chip 302 and the second constant current chip 303 according to the closing times of an external power supply, and further the first constant current chip 302 and the second constant current chip 303 control the on/off of the first LED string 304 and the second LED string 305 according to different driving signals, thereby realizing the color temperature adjustment of the LED lamps, and since the low voltage detection module 100 is realized by only a plurality of switching elements, the low voltage detection module has a simple structure, small volume and low cost, and further the LED color temperature adjustment control circuit 30 has a simple structure, a small volume and low cost, and solves the problems of large volume and high cost of the existing LED color temperature adjustment control circuit.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The LED color temperature adjusting control chip is used for driving a plurality of constant current chips to adjust the color temperature of a plurality of LED lamp strings and comprises a noise suppression module, a state storage module and a driving module, wherein the noise suppression module is connected with the state storage module, and the state storage module is connected with the driving module;
The voltage input end of the low voltage detection module is connected with the output end of an external rectifying circuit, and the signal output end of the low voltage detection module is connected with the noise suppression module;
the low voltage detection module comprises a plurality of switching elements; the low-voltage detection module detects the output voltage of the rectification circuit and outputs a corresponding detection signal to the noise suppression module; the noise suppression module carries out filtering processing on the detection signal and then outputs the detection signal to the state storage module; the state storage module outputs corresponding state control signals to the driving module according to the times of receiving the filtered detection signals in preset time, and the driving module drives a plurality of constant current chips according to the state control signals;
The low-voltage detection module comprises a control unit and a detection signal generation unit;
The input end of the control unit is commonly connected with the input end of the detection signal generation unit to form a voltage input end of the low voltage detection module, the output end of the control unit is connected with the control end of the detection signal generation unit, and the output end of the detection signal generation unit is a signal output end of the low voltage detection module;
The control unit detects the output voltage of the rectifying circuit and outputs a corresponding control signal to the detection signal generation unit, and the detection signal generation unit generates the corresponding detection signal according to the control signal;
The LED color temperature adjusting control chip comprises two external constant current chips, and further comprises a first switching tube and a second switching tube, wherein the control end of the first switching tube and the control end of the second switching tube are connected with the output end of the driving module, the input end of the first switching tube is connected with the external first constant current chip, the output end of the first switching tube is grounded, the input end of the second switching tube is connected with the external second constant current chip, and the output end of the second switching tube is grounded.
2. The LED color temperature adjustment control chip of claim 1, further comprising a power supply module and a reset module;
The voltage input end of the power supply module is connected with the output end of the rectifying circuit, the voltage output end of the power supply module is connected with the voltage input end of the reset module and an external charging capacitor, and the signal output end of the reset module is connected with the state storage module;
When the rectifying circuit outputs voltage, the power supply module performs voltage conversion on the output voltage of the rectifying circuit to output reset working voltage to charge the charging capacitor, and meanwhile outputs the reset working voltage to the reset module, and the reset module outputs a state maintaining signal to the state storage module according to the reset working voltage so that the state storage module maintains a self storage state according to the state maintaining signal; when the rectifying circuit does not output voltage, the charging capacitor discharges to the reset module, and when the charging capacitor finishes discharging, the reset module outputs a state reset signal to the state storage module, so that the state storage module resets the self storage state according to the state reset signal.
3. The LED color temperature adjustment control chip of claim 1, wherein the control unit comprises a first switching element, a second switching element, a third switching element, a fourth switching element, a fifth switching element, a sixth switching element, a seventh switching element, an eighth switching element, a ninth switching element, a tenth switching element, an eleventh switching element, a twelfth switching element, a thirteenth switching element, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first diode, a second diode, and a third diode;
The input end of the first switch element, the first end of the first resistor, the input end of the seventh switch element and the first end of the fifth resistor are commonly connected to form the input end of the control unit; the control end and the output end of the first switch element are commonly connected with the first end of the first resistor, the second end of the first resistor is connected with the input end of the second switch element, the control end and the output end of the second switch element are commonly connected with the input end of the third switch element, the control end and the output end of the third switch element are commonly connected with the input end of the fourth switch element, the control end and the output end of the fourth switch element are commonly connected with the input end of the fifth switch element, the control end and the output end of the fifth switch element are commonly connected with the cathode of the first diode, the anode of the first diode is connected with the first end of the second diode, the anode of the third diode, the control end of the thirteenth switch element and the input end and the control end of the twelfth switch element are commonly connected, the second end of the second resistor is commonly connected with the control end of the eighth switch element, the control end of the eighth switch element is commonly connected with the output end of the eighth switch element, the eighth switch element is commonly connected with the control end of the eighth switch element, the eighth switch element is commonly connected with the output end of the eighth switch element, the output end and the control end of the eleventh switching element are commonly connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the cathode of the third diode, the output end of the twelfth switching element and the output end of the thirteenth switching element are commonly connected with the ground, and the input end of the thirteenth switching element and the second end of the sixth resistor are commonly connected to form the output end of the control unit.
4. The LED color temperature adjustment control chip according to claim 3, wherein the detection signal generation unit includes a fourteenth switching element, a fifteenth switching element, a sixteenth switching element, a seventeenth switching element, an eighteenth switching element, a nineteenth switching element, a twentieth switching element, a twenty first switching element, a twenty second switching element, and a twenty third switching element;
The control end of the fourteenth switching element, the control end of the fifteenth switching element, the control end of the sixteenth switching element and the control end of the seventeenth switching element are commonly connected to form the control end of the detection signal generation unit, the input end of the fourteenth switching element, the input end of the twenty-second switching element and the input end of the twenty-second switching element are commonly connected to form the input end of the detection signal generation unit, the output end of the fourteenth switching element is connected to the input end of the fifteenth switching element and the input end of the eighteenth switching element, the output end of the fifteenth switching element, the control end of the eighteenth switching element, the input end of the sixteenth switching element, the control end of the nineteenth switching element, the control end of the twenty-second switching element and the control end of the twenty-first switching element are commonly connected, the output end of the sixteenth switching element is connected with the input end of the seventeenth switching element and the output end of the nineteenth switching element, the output end of the seventeenth switching element is grounded, the input end of the nineteenth switching element receives the output voltage of the rectifying circuit, the output end of the twentieth switching element, the input end of the twenty first switching element, the control end of the twenty second switching element and the control end of the twenty third switching element are commonly connected, the output end of the twenty second switching element and the input end of the twenty third switching element are commonly connected to form the output end of the detection signal generating unit, the input end of the twenty third switching element is connected with the control end of the sixteenth switching element, the output end of the twenty-first switching element and the output end of the twenty-third switching element are commonly grounded.
5. The LED color temperature adjustment control chip of claim 2, wherein the power supply module comprises a twenty-fourth switching element, a twenty-fifth switching element, a twenty-sixth switching element, a twenty-seventh switching element, a seventh resistor, an eighth resistor, a ninth resistor, and a fourth diode;
The input end of the twenty-fourth switching element, the first end of the seventh resistor and the first end of the ninth resistor are commonly connected to form a voltage input end of the power supply module, the control end of the twenty-fourth switching element is connected with the second end of the seventh resistor and the first end of the eighth resistor, the output end of the twenty-fourth switching element is commonly grounded to the output end of the twenty-fifth switching element and the input end and the output end of the twenty-seventh switching element, the second end of the eighth resistor is commonly connected to the control end of the twenty-sixth switching element and the cathode of the fourth diode, the anode of the fourth diode is connected to the control end and the input end of the twenty-fifth switching element, the second end of the ninth resistor is connected to the input end of the twenty-sixth switching element, and the output end of the twenty-sixth switching element is commonly connected to the control end of the twenty-seventh switching element to form a voltage output end of the power supply module.
6. The LED color temperature adjustment control chip of claim 2, wherein the reset module comprises a twenty-eighth switching element, a twenty-ninth switching element, a thirty-eighth switching element, a thirty-first switching element, a thirty-second switching element, a thirty-third switching element, a thirty-fourth switching element, a thirty-fifth switching element, a thirty-sixth switching element, a thirty-seventh switching element, a thirty-eighth switching element, a tenth resistor, an eleventh resistor, a twelfth resistor, and a thirteenth resistor;
The first end of the tenth resistor, the input end of the twenty-eighth switching element, the first end of the thirteenth resistor, the input end of the thirty-first switching element, the input end of the thirty-third switching element and the input end of the thirty-eighth switching element are commonly connected to form a voltage input end of the reset module, the second end of the tenth resistor is connected with the first end of the eleventh resistor and the output end of the twenty-eighth switching element, the second end of the eleventh resistor is connected with the first end of the twelfth resistor, the control end of the thirty-ninth switching element and the control end of the twenty-ninth switching element, the second end of the twelfth resistor is connected with the output end of the twenty-ninth switching element, the control end of the twenty-eighth switching element is connected with the second end of the thirteenth resistor, the input end of the thirty-eighth switching element, the control end of the thirty-first switching element and the control end of the thirty-second switching element, the output end of the thirty-third switching element is connected with the input end of the twenty-ninth switching element, the output end of the thirty-second switching element, the output end of the thirty-fifth switching element, the output end of the thirty-sixth switching element and the output end of the thirty-seventh switching element, the output end of the thirty-first switching element, the input end of the thirty-second switching element, the control end of the thirty-third switching element, the control end of the thirty-fourth switching element and the control end of the thirty-fifth switching element are connected with each other, the output end of the thirty-third switching element, the input end of the thirty-sixth switching element, the control end of the thirty-sixth switching element, the control end of the thirty-seventh switching element and the control end of the thirty-eighth switching element are commonly connected, the output end of the thirty-fourth switching element is connected with the input end of the thirty-fifth switching element, and the output end of the thirty-eighth switching element and the input end of the thirty-seventh switching element are commonly connected to form the signal output end of the reset module.
7. An LED color temperature adjustment control circuit, characterized in that the LED color temperature adjustment control circuit comprises a rectifying circuit, a sampling circuit, a charging capacitor, a plurality of constant current chips, a plurality of LED strings, and the LED color temperature adjustment control chip according to any one of claims 1-6;
And the sampling circuit samples the output voltage of the rectifying circuit, and one constant current chip drives one LED lamp string.
8. An LED lamp comprising the LED color temperature adjustment control circuit of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610471207.6A CN107548188B (en) | 2016-06-24 | 2016-06-24 | LED lamp, LED color temperature adjusting control chip and circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610471207.6A CN107548188B (en) | 2016-06-24 | 2016-06-24 | LED lamp, LED color temperature adjusting control chip and circuit |
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| Publication Number | Publication Date |
|---|---|
| CN107548188A CN107548188A (en) | 2018-01-05 |
| CN107548188B true CN107548188B (en) | 2024-05-24 |
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