CN213462413U - Dimming LED lamp circuit - Google Patents
Dimming LED lamp circuit Download PDFInfo
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- CN213462413U CN213462413U CN202022169341.5U CN202022169341U CN213462413U CN 213462413 U CN213462413 U CN 213462413U CN 202022169341 U CN202022169341 U CN 202022169341U CN 213462413 U CN213462413 U CN 213462413U
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Abstract
The utility model discloses a dimming LED lamp circuit, including voltage power supply circuit, DC-DC voltage circuit, the luminous control circuit, RGBW light emitting module, linear constant current circuit and voltage regulation circuit, voltage power supply circuit sets for its output voltage according to the voltage that its voltage regulation end inserts, voltage power supply circuit has minimum output voltage, minimum output voltage is less than RGBW light emitting module's turn-on voltage, voltage power supply circuit has reference voltage, voltage power supply circuit adjusts the output voltage size between its positive output and negative output through comparing the voltage that its voltage regulation end inserts and reference voltage, voltage regulation circuit has the preset voltage value in, the voltage of voltage regulation circuit's output is decided by the minimum voltage in its input voltage, when the lowest voltage of the input end of the voltage-stabilizing circuit is equal to a preset voltage value, the voltage of the output end of the voltage-stabilizing circuit is equal to a reference voltage; the advantage is on the basis that has great flexibility and higher output efficiency, and overall cost is lower.
Description
Technical Field
The utility model relates to a LED lamp circuit especially relates to a LED lamp circuit of adjusting luminance.
Background
With the rapid development of dimming technologies in the LED lamp industry, dimming LED lamps capable of emitting red light, green light, blue light and white light have been widely applied to household, landscape lighting and urban lighting projects.
As shown in fig. 1, an existing dimming LED lamp circuit generally includes an RGBW light emitting module, a voltage power circuit, a DC-DC constant current circuit, a light emitting control circuit, and a DC-DC voltage circuit, where the RGBW light emitting module includes four LED light emitting circuits, the four LED light emitting circuits are respectively an LED light emitting circuit capable of emitting red light, an LED light emitting circuit capable of emitting green light, an LED light emitting circuit capable of emitting blue light, and an LED light emitting circuit capable of emitting white light, and the light emitting intensities of the four LED light emitting circuits can be independently controlled, and respectively emit red light, green light, blue light, and white light corresponding to the light emitting intensities under current driving. When the currents for driving the LED light-emitting circuits are different, the light-emitting intensity ratios of the LED light-emitting circuits are different, and at the moment, the RGBW light-emitting module emits mixed light formed by mixing different colors of light. The total luminous intensity of the four LED luminous circuits is related to the total current magnitude for driving the four LED luminous circuits. The voltage power supply circuit is used for accessing an external power supply voltage and outputting constant direct current voltage after converting the external power supply voltage, the DC-DC voltage circuit is connected with the voltage power supply circuit and supplies power to the light-emitting control circuit after converting the direct current output by the voltage power supply circuit into working voltage of the light-emitting control circuit, the DC-DC constant current circuit is connected with the light-emitting control circuit, the light-emitting control circuit is internally preset with a light-emitting control program or can receive an external light-emitting control signal and output a corresponding dimming signal according to the light-emitting control program or the received external light-emitting control signal, the DC-DC constant current circuit converts the direct current voltage output by the voltage power supply circuit into four paths of driving current to be output under the control of the dimming signal output by the light-emitting control circuit, and the four LED light-emitting circuits are respectively connected with the DC-DC, and four paths of driving current are connected in a one-to-one correspondence manner, and light is emitted according to the corresponding brightness and color.
However, the dimming LED lamp circuit is characterized in that the internal voltage power circuit is implemented by a constant voltage power circuit, the output voltage of the circuit is kept unchanged, the DC-DC constant current circuit for driving the RGBW light emitting module includes four DC-DC driving circuits with the same performance, and the four DC-DC driving circuits are implemented by a conversion mode of a DC-DC switching power supply. The DC-DC constant current circuit has high flexibility and high output efficiency, but the circuit cost is high, so that the dimming LED lamp circuit has high flexibility and high output efficiency, but the overall cost is high.
Disclosure of Invention
The utility model aims to solve the technical problem that a lower LED lamp circuit of adjusting luminance of overall cost is provided on the basis that has great flexibility and higher output efficiency.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a dimming LED lamp circuit comprises a voltage power circuit, a DC-DC voltage circuit, a light-emitting control circuit and an RGBW light-emitting module, wherein the voltage power circuit is provided with a first input end, a second input end, a positive output end and a negative output end, the DC-DC voltage circuit is provided with a positive electrode, a negative electrode and an output end, the RGBW light-emitting module comprises four LED light-emitting circuits which respectively emit red light, green light, blue light and white light, the conduction voltages of the four LED light-emitting circuits are equal, the four LED light-emitting circuits are respectively provided with a positive electrode and a negative electrode, the light-emitting control circuit is provided with a positive electrode, a negative electrode and a control end, the positive output end of the voltage power circuit is connected with the positive electrode of the DC-DC voltage circuit, the output end of the DC-DC voltage circuit is connected with the positive electrode of the light-emitting control circuit, and the negative electrode of the DC-DC, The negative electrode of the light-emitting control circuit is connected with the negative output end of the voltage power supply circuit, the positive electrodes of the four LED light-emitting circuits are connected, the connecting ends of the four LED light-emitting circuits are used as the positive electrodes of the RGBW light-emitting module, the negative electrodes of the four LED light-emitting circuits are respectively used as the four negative electrodes of the RGBW light-emitting module, the voltage power supply circuit is also provided with a voltage adjusting end, the voltage power supply circuit can set the output voltage between the positive output end and the negative output end of the voltage power supply circuit according to the voltage connected to the voltage adjusting end, the minimum output voltage is arranged between the positive output end and the negative output end of the voltage power supply circuit, and the minimum output voltage is smaller than the conducting voltage of the RGBW;
the dimming LED lamp circuit further comprises a linear constant current circuit and a voltage regulating circuit, wherein the linear constant current circuit is provided with a control end, four output ends with the same characteristics and a negative electrode, the control end of the linear constant current circuit is provided with a current setting value, the four output ends of the linear constant current circuit are respectively provided with voltage threshold values with the same size, and when the voltage of one output end of the linear constant current circuit is greater than or equal to the voltage threshold value, the current output by the output end is equal to the current setting value of the control end of the linear constant current circuit and keeps unchanged; when the voltage of one output end of the linear constant current circuit is smaller than the voltage threshold, the current output by the output end is smaller than the current set value of the control end of the linear constant current circuit, and the lower the voltage of the output end is, the smaller the corresponding current value is, the control end of the linear constant current circuit is connected with the control end of the light-emitting control circuit, the four output ends of the linear constant current circuit are correspondingly connected with the four cathodes of the RGBW light-emitting module one by one, the anode of the RGBW light-emitting module is connected with the positive output end of the voltage power circuit, and the cathode of the linear constant current circuit is connected with the negative output end of the voltage power circuit;
the voltage regulating circuit is provided with four input ends, an output end, an anode and a cathode, the anode of the voltage regulating circuit is connected with the positive output end of the voltage power supply circuit, the four input ends of the voltage regulating circuit are correspondingly connected with the four output ends of the linear constant current circuit one by one, the cathode of the voltage regulating circuit is connected with the negative output end of the voltage power supply circuit, the output end of the voltage regulating circuit is connected with the voltage regulating end of the voltage power supply circuit, a reference voltage is arranged in the voltage power supply circuit, the voltage power supply circuit regulates the output voltage between the positive output end and the negative output end by comparing the voltage accessed by the voltage regulating end with the reference voltage, and when the voltage of the voltage regulating end of the voltage power supply circuit is greater than the reference voltage, the output voltage of the voltage power supply circuit is reduced, when the voltage of the voltage regulation end of the voltage power supply circuit is smaller than the reference voltage, the output voltage of the voltage power supply circuit is increased, when the voltage of the voltage regulation end of the voltage power supply circuit is equal to the reference voltage, the output voltage of the voltage power supply circuit is kept unchanged, a preset voltage value is arranged in the voltage regulation circuit, the preset voltage value is set to be equal to the voltage threshold value, the voltage of the output end of the voltage regulation circuit is determined by the lowest voltage of the voltages connected to the four input ends of the voltage regulation circuit, when the lowest voltage of the voltages connected to the four input ends of the voltage regulation circuit is equal to the preset voltage value, the voltage of the output end of the voltage regulation circuit is equal to the reference voltage, and when the first input end and the second input end of the voltage power supply circuit are connected to the external power supply voltage, the voltage power supply circuit enters the working state, outputting an output voltage equal to the minimum output voltage between a positive output end and a negative output end of the light-emitting diode, outputting a direct current voltage by an output end of the DC-DC voltage circuit, enabling the light-emitting control circuit to enter a working state and outputting a corresponding dimming signal, respectively setting current values of four output ends of the linear constant current circuit according to the dimming signal, wherein the output voltage of the voltage power supply circuit is smaller than the conducting voltage of the RGBW light-emitting module, the voltages of four input ends of the voltage regulating circuit are smaller than the preset voltage value, the output end of the voltage regulating circuit outputs an output voltage smaller than the reference voltage, the output voltage of the voltage power supply circuit begins to rise, and when the output voltage of the voltage power supply circuit rises to be equal to the conducting voltage of the RGBW light-emitting module, the RGBW light-emitting module is turned on to start light emission, voltages of four output ends of the linear constant current circuit are simultaneously increased along with the continuous increase of the output voltage of the voltage power supply circuit, when the lowest voltage of the voltages of the four output ends of the linear constant current circuit is equal to the preset voltage value, the output voltage of the voltage regulating circuit outputs the output voltage which is equal to the reference voltage, the output voltage of the voltage power supply circuit is not increased and keeps unchanged, if the lowest voltage of the voltages of the four output ends of the linear constant current circuit is greater than or less than the preset voltage value in the subsequent working process, when the lowest voltage of the voltages of the four output ends of the linear constant current circuit is greater than the preset voltage value, the output voltage of the voltage regulating circuit outputs the output voltage which is greater than the reference voltage, the output voltage of the voltage power supply circuit is reduced, until the lowest voltage among the voltages of the four output ends of the linear constant current circuit is equal to the preset voltage value, the output voltage of the voltage power supply circuit does not change any more and keeps unchanged again, when the lowest voltage becomes smaller than the preset voltage value, the output end of the voltage regulating circuit outputs the output voltage smaller than the reference voltage, the output voltage of the voltage power supply circuit is increased until the lowest voltage among the voltages of the four output ends of the linear constant current circuit is equal to the preset voltage value, and the output voltage of the voltage power supply circuit does not change any more and keeps unchanged again.
The voltage power supply circuit comprises a switch type voltage conversion circuit, a photoelectric coupler, a three-end adjustable voltage reference source, a first resistor, a second resistor and a third resistor, wherein the switch type voltage conversion circuit is provided with a first input end, a second input end, a positive voltage output end, a negative voltage output end, a positive control end and a negative control end, the photoelectric coupler is provided with a positive electrode, a negative electrode, a collector electrode and an emitter electrode, the three-end adjustable voltage reference source is provided with an anode, a cathode and a reference electrode, one end of the first resistor, one end of the second resistor and the positive voltage output end of the switch type voltage conversion circuit are connected, the connecting end of the first resistor and the second resistor is the positive output end of the voltage power supply circuit, the other end of the first resistor is connected with the anode of the photoelectric coupler, the negative electrode of the photoelectric coupler is connected with the cathode of the three-end adjustable voltage reference source, the reference pole of the three-terminal adjustable voltage reference source, the other end of the second resistor and one end of the third resistor are connected, the connection end of the reference pole and the other end of the second resistor is the voltage adjusting end of the voltage power supply circuit, the negative pole of the switch type voltage conversion circuit, the anode of the three-terminal adjustable voltage reference source and the other end of the third resistor are connected, the connection end of the third resistor is the negative output end of the voltage power supply circuit, the collector of the photoelectric coupler is connected with the positive control end of the switch type voltage conversion circuit, and the emitter of the photoelectric coupler is connected with the negative control end of the switch type voltage conversion circuit.
The voltage regulating circuit comprises a fourth resistor, a first capacitor, a first diode, a second diode, a third diode and a fourth diode, wherein the first diode, the second diode, the third diode and the fourth diode are all realized by rectifier diodes, one end of the fourth resistor is the anode of the voltage regulating circuit, the other end of the fourth resistor, one end of the first capacitor, the anode of the first diode, the anode of the second diode, the anode of the third diode and the anode of the fourth diode are connected, the connection ends of the fourth resistor and the first diode are the output ends of the voltage regulating circuit, the cathode of the first diode, the cathode of the second diode, the cathode of the third diode and the cathode of the fourth diode are used as four input ends of the voltage regulating circuit, the other end of the first capacitor is the cathode of the voltage regulating circuit.
The four LED light-emitting circuits are respectively formed by connecting the same number of LEDs in series, and the working voltages of the four LED light-emitting circuits are equal.
Compared with the prior art, the utility model has the advantages that the anodes of the four LED light-emitting circuits are connected, the connecting ends of the four LED light-emitting circuits are used as the anodes of the RGBW light-emitting module, the cathodes of the four LED light-emitting circuits are respectively used as the four cathodes of the RGBW light-emitting module, the voltage power circuit is also provided with a voltage adjusting end, the voltage power circuit can set the output voltage between the positive output end and the negative output end according to the voltage accessed by the voltage adjusting end, the minimum output voltage is arranged between the positive output end and the negative output end of the voltage power circuit and is smaller than the on-state voltage of the RGBW light-emitting module, the dimming LED lamp circuit also comprises a linear constant current circuit and a voltage adjusting circuit, the linear constant current circuit is provided with a control end, the four output ends and the cathodes have the same characteristics, the control end of the linear constant current circuit has a, when the voltage of a certain output end of the linear constant current circuit is greater than or equal to a voltage threshold value, the current output by the output end is equal to a current set value of a control end of the linear constant current circuit and keeps unchanged; the control end of the linear constant current circuit is connected with the control end of the light-emitting control circuit, four output ends of the linear constant current circuit are connected with four negative electrodes of the RGBW light-emitting module in a one-to-one correspondence manner, the positive electrode of the RGBW light-emitting module is connected with the positive output end of the voltage power circuit, the negative electrode of the linear constant current circuit is connected with the negative output end of the voltage power circuit, the voltage regulating circuit is provided with four input ends, an output end, a positive electrode and a negative electrode, the positive electrode of the voltage regulating circuit is connected with the positive output end of the voltage power circuit, the four input ends of the voltage regulating circuit are connected with the four output ends of the linear constant current circuit in a one-to-one correspondence manner, the negative electrode of the voltage regulating circuit is connected with the negative output end of the voltage power circuit, the voltage power circuit is internally provided with reference voltage, and the voltage power circuit regulates the output between the The voltage is large, when the voltage of the voltage regulation end of the voltage power supply circuit is larger than the reference voltage, the output voltage of the voltage power supply circuit is reduced, when the voltage of the voltage regulation end of the voltage power supply circuit is smaller than the reference voltage, the output voltage of the voltage power supply circuit is increased, when the voltage of the voltage regulation end of the voltage power supply circuit is equal to the reference voltage, the output voltage of the voltage power supply circuit is kept unchanged, a preset voltage value is arranged in the voltage regulation circuit, the preset voltage value is set to be equal to a voltage threshold value, the voltage of the output end of the voltage regulation circuit is determined by the lowest voltage of the voltages connected with the four input ends of the voltage regulation circuit, when the lowest voltage of the voltages connected with the four input ends of the voltage regulation circuit is equal to the preset voltage value, the voltage of the output end of the voltage regulation circuit is equal to the reference voltage, and after the first input end and the second input end, outputting an output voltage equal to the minimum output voltage between a positive output end and a negative output end of the linear constant current circuit, outputting a direct current voltage by the output end of a DC-DC voltage circuit, enabling a light-emitting control circuit to enter a working state and outputting a corresponding dimming signal, respectively setting current values of four output ends of the linear constant current circuit according to the dimming signal, wherein the output voltage of a voltage power supply circuit is smaller than the conducting voltage of an RGBW light-emitting module, the voltages of four input ends of the voltage regulating circuit are smaller than a preset voltage value, the output end of the voltage regulating circuit outputs an output voltage smaller than a reference voltage, the output voltage of the voltage power supply circuit starts to rise at the moment, when the output voltage of the voltage power supply circuit rises to be equal to the conducting voltage of the RGBW light-emitting module, the RGBW light-emitting module starts to emit light, and the voltages of the four output ends of, when the lowest voltage of the voltages of the four output ends of the linear constant current circuit is equal to a preset voltage value, the output end of the voltage regulating circuit outputs an output voltage equal to a reference voltage, at the moment, the output voltage of the voltage power supply circuit is not increased and is kept unchanged, if the lowest voltage of the voltages of the four output ends of the linear constant current circuit is greater than or less than the preset voltage value in the subsequent working process, when the lowest voltage of the voltages of the four output ends of the linear constant current circuit is greater than the preset voltage value, the output voltage of the voltage regulating circuit outputs an output voltage greater than the reference voltage, the output voltage of the voltage power supply circuit is reduced until the lowest voltage of the voltages of the four output ends of the linear constant current circuit is equal to the preset voltage value, and at the moment, the output voltage of the voltage power supply circuit is not changed and is kept unchanged again, when becoming to be less than when predetermineeing the voltage value, voltage regulating circuit's output be less than this moment voltage regulating circuit's output voltage reference voltage's output voltage, voltage power supply circuit's output voltage rise until the minimum voltage in the voltage of four outputs of linear constant current circuit equal to predetermine the voltage value, this moment voltage power supply circuit's output voltage no longer change and keep unchangeable once more, from this the utility model discloses a set up voltage regulating circuit, adopt linear constant current circuit to replace DC-DC constant current circuit among the prior art, on the basis that has great flexibility and higher output efficiency, overall cost is lower.
Drawings
FIG. 1 is a block diagram of a prior art dimming LED lamp circuit;
fig. 2 is a block diagram of the dimming LED lamp circuit of the present invention;
fig. 3 is a circuit structure diagram of the dimming LED lamp circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Example (b): as shown in FIG. 2, a dimming LED lamp circuit comprises a voltage power circuit, a DC-DC voltage circuit, a light emitting control circuit and an RGBW light emitting module, wherein the voltage power circuit has a first input end, a second input end, a positive output end and a negative output end, the DC-DC voltage circuit has a positive electrode, a negative electrode and an output end, the RGBW light emitting module comprises four LED light emitting circuits LED 1-LED 4 which respectively emit red light, green light, blue light and white light, the conduction voltages of the four LED light emitting circuits LED 1-LED 4 are equal, the four LED light emitting circuits LED 1-LED 4 respectively have a positive electrode and a negative electrode, the light emitting control circuit has a positive electrode, a negative electrode and a control end, the positive output end of the voltage power circuit is connected with the positive electrode of the DC-DC voltage circuit, the output end of the DC-DC voltage circuit is connected with the positive electrode of the light emitting control circuit, the negative electrode of the DC-DC voltage circuit, the negative electrode, the positive electrodes of the four LED light-emitting circuits LED 1-LED 4 are connected, the connecting ends of the four LED light-emitting circuits LED 1-LED 4 are used as the positive electrodes of the RGBW light-emitting module, the negative electrodes of the four LED light-emitting circuits LED 1-LED 4 are respectively used as the four negative electrodes of the RGBW light-emitting module, the voltage power supply circuit is also provided with a voltage adjusting end, the voltage power supply circuit can set the output voltage between the positive output end and the negative output end of the voltage power supply circuit according to the voltage accessed by the voltage adjusting end, the minimum output voltage is arranged between the positive output end and the negative output end of the voltage; the dimming LED lamp circuit further comprises a linear constant current circuit and a voltage regulating circuit, wherein the linear constant current circuit is provided with a control end, four output ends with the same characteristics and a negative electrode, the control end of the linear constant current circuit is provided with a current setting value, the four output ends of the linear constant current circuit are respectively provided with voltage threshold values with the same size, and when the voltage of one output end of the linear constant current circuit is greater than or equal to the voltage threshold value, the current output by the output end is equal to the current setting value of the control end of the linear constant current circuit and keeps unchanged; when the voltage of one output end of the linear constant current circuit is smaller than a voltage threshold value, the current output by the output end is smaller than a current set value of a control end of the linear constant current circuit, the lower the voltage of the output end is, the smaller the corresponding current value is, the control end of the linear constant current circuit is connected with the control end of the light-emitting control circuit, four output ends of the linear constant current circuit are correspondingly connected with four cathodes of the RGBW light-emitting module one by one, the positive electrode of the RGBW light-emitting module is connected with the positive output end of the voltage power circuit, and the negative electrode of the linear constant current circuit is connected with the negative output; the voltage regulating circuit is provided with four input ends, an output end, a positive pole and a negative pole, the positive pole of the voltage regulating circuit is connected with the positive output end of the voltage power supply circuit, the four input ends of the voltage regulating circuit are correspondingly connected with the four output ends of the linear constant current circuit one by one, the negative pole of the voltage regulating circuit is connected with the negative output end of the voltage power supply circuit, the output end of the voltage regulating circuit is connected with the voltage regulating end of the voltage power supply circuit, the voltage power supply circuit is internally provided with a reference voltage, the voltage power supply circuit regulates the output voltage between the positive output end and the negative output end by comparing the voltage connected to the voltage regulating end with the reference voltage, when the voltage of the voltage regulating end of the voltage power supply circuit is greater than the reference voltage, the output voltage of the voltage power supply circuit is reduced, and when the voltage of the voltage regulating end of the voltage power supply circuit is less, when the voltage of the voltage regulating end of the voltage power supply circuit is equal to the reference voltage, the output voltage of the voltage power supply circuit is kept unchanged, the voltage regulating circuit is internally provided with a preset voltage value, the preset voltage value is set to be equal to a voltage threshold value, the voltage of the output end of the voltage regulating circuit is determined by the lowest voltage of the voltages connected to the four input ends of the voltage regulating circuit, when the lowest voltage of the voltages connected to the four input ends of the voltage regulating circuit is equal to the preset voltage value, the voltage of the output end of the voltage regulating circuit is equal to the reference voltage, after the first input end and the second input end of the voltage power supply circuit are connected to an external power supply voltage, the voltage power supply circuit enters a working state, the output voltage equal to the minimum output voltage of the voltage power supply circuit is output between the positive output end and the negative output end of the voltage power supply circuit, the output, the linear constant current circuit respectively sets current values of four output ends of the linear constant current circuit according to the dimming signal, the output voltage of the voltage power supply circuit is smaller than the conducting voltage of the RGBW light emitting module at the moment, the voltages of four input ends of the voltage regulating circuit are all smaller than the preset voltage value, the output voltage of the voltage regulating circuit outputs the output voltage smaller than the reference voltage, the output voltage of the voltage power supply circuit begins to rise at the moment, when the output voltage of the voltage power supply circuit rises to be equal to the conducting voltage of the RGBW light emitting module, the RGBW light emitting module conducts and starts to emit light, the voltages of the four output ends of the linear constant current circuit rise simultaneously along with the continuous rise of the output voltage of the voltage power supply circuit, when the lowest voltage of the voltages of the four output ends of the linear constant current circuit is equal to the preset voltage value, the output voltage of the voltage regulating circuit outputs the output voltage, if the lowest voltage among the voltages of the four output ends of the linear constant current circuit becomes greater than or less than the preset voltage value in the subsequent working process, when the voltage value is larger than the preset voltage value, the output end of the voltage regulating circuit outputs an output voltage larger than the reference voltage, the output voltage of the voltage power supply circuit is reduced until the lowest voltage of the voltages of the four output ends of the linear constant current circuit is equal to the preset voltage value, the output voltage of the voltage power supply circuit does not change and keeps unchanged again, when the voltage value is smaller than the preset voltage value, the output end of the voltage regulating circuit outputs an output voltage smaller than the reference voltage, the output voltage of the voltage power supply circuit is increased until the lowest voltage of the voltages of the four output ends of the linear constant current circuit is equal to the preset voltage value, and the output voltage of the voltage power supply circuit does not change and remains unchanged again.
As shown in fig. 3, in the present embodiment, the voltage power supply circuit includes a switch-type voltage conversion circuit M1, a photocoupler U1, a three-terminal adjustable voltage reference source U2, a first resistor R1, a second resistor R2 and a third resistor R3, the switch-type voltage conversion circuit M1 has a first input terminal, a second input terminal, a positive voltage output terminal, a negative voltage output terminal, a positive control terminal and a negative control terminal, the photocoupler U1 has a positive electrode, a negative electrode, a collector and an emitter, the three-terminal adjustable voltage reference source U2 has a positive electrode, a cathode and a reference electrode, one end of the first resistor R1, one end of the second resistor R2 and the positive voltage output terminal of the switch-type voltage conversion circuit M1 are connected at the positive output terminal of the voltage power supply circuit, the other end of the first resistor R1 and the three-terminal of the photocoupler U1 are connected, the negative electrode of the photocoupler U1 and the cathode of the adjustable voltage reference voltage source U2, the reference pole of the three-terminal adjustable voltage reference source U2, the other end of the second resistor R2 and one end of the third resistor R3 are connected, the connection ends of the two ends are voltage adjusting ends of the voltage power circuit, the negative pole of the switch type voltage conversion circuit M1, the anode of the three-terminal adjustable voltage reference source U2 and the other end of the third resistor R3 are connected, the connection ends of the two ends are negative output ends of the voltage power circuit, the collector of the photoelectric coupler U1 is connected with the positive control end of the switch type voltage conversion circuit M1, and the emitter of the photoelectric coupler U1 is connected with the negative control end of the switch type voltage conversion circuit M1.
As shown in fig. 3, in the present embodiment, the voltage regulating circuit includes a fourth resistor R4, a first capacitor C1, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 are implemented by rectifier diodes, one end of the fourth resistor R4 is an anode of the voltage regulating circuit, the other end of the fourth resistor R4, one end of the first capacitor C1, the anode of the first diode D1, the anode of the second diode D2, the anode of the third diode D3 and the anode of the fourth diode D4 are connected, and the connection ends thereof are output ends of the voltage regulating circuit, the cathode of the first diode D1, the cathode of the second diode D2, the cathode of the third diode D3 and the cathode of the fourth diode D4 are used as four input ends of the voltage regulating circuit, and the other end of the first capacitor C1 is a cathode of the voltage regulating circuit.
In this embodiment, the four LED light emitting circuits are respectively formed by connecting the same number of LEDs in series, and the operating voltages thereof are equal. The DC-DC voltage circuit, the light-emitting control circuit, the linear constant current circuit and the switch type voltage conversion circuit M1 are all realized by circuits of mature technology in the industry.
In this embodiment, the reference voltage of the reference electrode of the three-terminal adjustable voltage reference source U2 is a fixed value (the design parameter of the three-terminal adjustable voltage reference source U2), which is denoted as Vref, the reference voltage of the voltage power circuit is Vref, and the minimum output voltage of the voltage power circuit is equal to Vref (R) ("R")2//R4+R3)/R3，R2Is the resistance of the second resistor R2, R3Is the resistance value of the third resistor R34Is the resistance value of the fourth resistor R42//R4The resistance value of the second resistor R2 and the fourth resistor R4 in parallel connection. When the preset voltage of the voltage regulating circuit is designated as Vs and the conduction voltage of the rectifier diode is designated as Vdf, the output voltage of the voltage regulating circuit is Vs + Vdf equal to Vref, and the voltage of the voltage power supply circuit is unchangedThe output voltage Vo is Vled + Vs, where Vled is the operating voltage of the RGBW light emitting module.
Claims (4)
1. A dimming LED lamp circuit comprises a voltage power circuit, a DC-DC voltage circuit, a light-emitting control circuit and an RGBW light-emitting module, wherein the voltage power circuit is provided with a first input end, a second input end, a positive output end and a negative output end, the DC-DC voltage circuit is provided with a positive electrode, a negative electrode and an output end, the RGBW light-emitting module comprises four LED light-emitting circuits which respectively emit red light, green light, blue light and white light, the conduction voltages of the four LED light-emitting circuits are equal, the four LED light-emitting circuits are respectively provided with a positive electrode and a negative electrode, the light-emitting control circuit is provided with a positive electrode, a negative electrode and a control end, the positive output end of the voltage power circuit is connected with the positive electrode of the DC-DC voltage circuit, and the output end of the DC-DC voltage circuit is connected with the positive electrode of the light-emitting control, the negative pole of the DC-DC voltage circuit, the negative pole of the light-emitting control circuit and the negative output end of the voltage power supply circuit are connected, the LED light-emitting circuit is characterized in that the positive poles of the four LED light-emitting circuits are connected, the connecting ends of the four LED light-emitting circuits are used as the positive poles of the RGBW light-emitting module, the negative poles of the four LED light-emitting circuits are respectively used as the four negative poles of the RGBW light-emitting module, the voltage power supply circuit is also provided with a voltage adjusting end, the voltage power supply circuit can set the output voltage between the positive output end and the negative output end of the voltage power supply circuit according to the voltage connected to the voltage adjusting end, the minimum output voltage is arranged between the positive output end and the negative output end of the voltage power supply circuit, and the minimum output voltage is smaller;
the dimming LED lamp circuit also comprises a linear constant current circuit and a voltage regulating circuit, wherein the linear constant current circuit is provided with a control end, four output ends with the same characteristics and a negative electrode, the control end of the linear constant current circuit is provided with a current setting value, the four output ends of the linear constant current circuit are respectively provided with voltage threshold values with the same size, when the voltage of one output end of the linear constant current circuit is greater than or equal to the voltage threshold value, the current output by the output end is equal to the current setting value of the control end of the linear constant current circuit and keeps unchanged, when the voltage of one output end of the linear constant current circuit is smaller than the voltage threshold value, the current output by the output end is smaller than the current setting value of the control end of the linear constant current circuit, and the lower the voltage of the output end is, the smaller the corresponding current value is, the control end of the linear constant current circuit is connected with the control end of the light-emitting control circuit, the four output ends of the linear constant current circuit are connected with the four cathodes of the RGBW light-emitting module in a one-to-one correspondence manner, the anode of the RGBW light-emitting module is connected with the positive output end of the voltage power supply circuit, and the cathode of the linear constant current circuit is connected with the negative output end of the voltage power supply circuit;
the voltage regulating circuit is provided with four input ends, an output end, an anode and a cathode, the anode of the voltage regulating circuit is connected with the positive output end of the voltage power supply circuit, the four input ends of the voltage regulating circuit are correspondingly connected with the four output ends of the linear constant current circuit one by one, the cathode of the voltage regulating circuit is connected with the negative output end of the voltage power supply circuit, the output end of the voltage regulating circuit is connected with the voltage regulating end of the voltage power supply circuit, a reference voltage is arranged in the voltage power supply circuit, the voltage power supply circuit regulates the output voltage between the positive output end and the negative output end by comparing the voltage accessed by the voltage regulating end with the reference voltage, and when the voltage of the voltage regulating end of the voltage power supply circuit is greater than the reference voltage, the output voltage of the voltage power supply circuit is reduced, when the voltage of the voltage regulation end of the voltage power supply circuit is smaller than the reference voltage, the output voltage of the voltage power supply circuit is increased, when the voltage of the voltage regulation end of the voltage power supply circuit is equal to the reference voltage, the output voltage of the voltage power supply circuit is kept unchanged, a preset voltage value is arranged in the voltage regulation circuit, the preset voltage value is set to be equal to the voltage threshold value, the voltage of the output end of the voltage regulation circuit is determined by the lowest voltage of the voltages connected to the four input ends of the voltage regulation circuit, when the lowest voltage of the voltages connected to the four input ends of the voltage regulation circuit is equal to the preset voltage value, the voltage of the output end of the voltage regulation circuit is equal to the reference voltage, and when the first input end and the second input end of the voltage power supply circuit are connected to the external power supply voltage, the voltage power supply circuit enters the working state, outputting an output voltage equal to the minimum output voltage between a positive output end and a negative output end of the light-emitting diode, outputting a direct current voltage by an output end of the DC-DC voltage circuit, enabling the light-emitting control circuit to enter a working state and outputting a corresponding dimming signal, respectively setting current values of four output ends of the linear constant current circuit according to the dimming signal, wherein the output voltage of the voltage power supply circuit is smaller than the conducting voltage of the RGBW light-emitting module, the voltages of four input ends of the voltage regulating circuit are smaller than the preset voltage value, the output end of the voltage regulating circuit outputs an output voltage smaller than the reference voltage, the output voltage of the voltage power supply circuit begins to rise, and when the output voltage of the voltage power supply circuit rises to be equal to the conducting voltage of the RGBW light-emitting module, the RGBW light-emitting module is turned on to start light emission, voltages of four output ends of the linear constant current circuit are simultaneously increased along with the continuous increase of the output voltage of the voltage power supply circuit, when the lowest voltage of the voltages of the four output ends of the linear constant current circuit is equal to the preset voltage value, the output voltage of the voltage regulating circuit outputs the output voltage which is equal to the reference voltage, the output voltage of the voltage power supply circuit is not increased and keeps unchanged, if the lowest voltage of the voltages of the four output ends of the linear constant current circuit is greater than or less than the preset voltage value in the subsequent working process, when the lowest voltage of the voltages of the four output ends of the linear constant current circuit is greater than the preset voltage value, the output voltage of the voltage regulating circuit outputs the output voltage which is greater than the reference voltage, the output voltage of the voltage power supply circuit is reduced, until the lowest voltage among the voltages of the four output ends of the linear constant current circuit is equal to the preset voltage value, the output voltage of the voltage power supply circuit does not change any more and keeps unchanged again, when the lowest voltage becomes smaller than the preset voltage value, the output end of the voltage regulating circuit outputs the output voltage smaller than the reference voltage, the output voltage of the voltage power supply circuit is increased until the lowest voltage among the voltages of the four output ends of the linear constant current circuit is equal to the preset voltage value, and the output voltage of the voltage power supply circuit does not change any more and keeps unchanged again.
2. A dimming LED lamp circuit as claimed in claim 1, wherein the voltage power circuit comprises a switching type voltage converting circuit, a photo coupler, a three-terminal adjustable voltage reference source, a first resistor, a second resistor and a third resistor, the switching type voltage converting circuit has a first input terminal, a second input terminal, a positive voltage output terminal, a negative voltage output terminal, a positive control terminal and a negative control terminal, the photo coupler has a positive electrode, a negative electrode, a collector and an emitter, the three-terminal adjustable voltage reference source has an anode, a cathode and a reference electrode, one terminal of the first resistor, one terminal of the second resistor and the positive voltage output terminal of the switching type voltage converting circuit are connected and the connection terminal is the positive output terminal of the voltage power circuit, the other terminal of the first resistor and the positive electrode of the photo coupler are connected, the negative electrode of the photoelectric coupler is connected with the negative electrode of the three-end adjustable voltage reference source, the reference electrode of the three-end adjustable voltage reference source, the other end of the second resistor and one end of the third resistor are connected, the connecting end of the second resistor and one end of the third resistor are connected, the voltage adjusting end of the voltage power supply circuit is the negative electrode of the switch type voltage conversion circuit, the anode of the three-end adjustable voltage reference source and the other end of the third resistor are connected, the connecting end of the third resistor and the third resistor is the negative output end of the voltage power supply circuit, the collector electrode of the photoelectric coupler is connected with the positive control end of the switch type voltage conversion circuit, and the emitter electrode of the photoelectric coupler is connected with the negative control end of the switch type voltage conversion circuit.
3. A dimming LED lamp circuit as claimed in claim 1, wherein the voltage adjusting circuit comprises a fourth resistor, a first capacitor, a first diode, a second diode, a third diode and a fourth diode, the first diode, the second diode, the third diode and the fourth diode are implemented by rectifier diodes, one end of the fourth resistor is an anode of the voltage adjusting circuit, the other end of the fourth resistor, one end of the first capacitor, an anode of the first diode, an anode of the second diode, an anode of the third diode and an anode of the fourth diode are connected and a connection end thereof is an output end of the voltage adjusting circuit, a cathode of the first diode, a cathode of the second diode, a cathode of the fourth diode and an anode of the fourth diode are connected, and a connection end thereof is an output end of the voltage adjusting circuit, a cathode of the first diode, a cathode of the second diode, The negative electrode of the third diode and the negative electrode of the fourth diode are used as four input ends of the voltage regulating circuit, and the other end of the first capacitor is used as the negative electrode of the voltage regulating circuit.
4. A dimming LED lamp circuit as claimed in claim 1, wherein the four LED light emitting circuits are respectively formed by connecting the same number of LEDs in series, and the working voltages thereof are equal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022169341.5U CN213462413U (en) | 2020-09-28 | 2020-09-28 | Dimming LED lamp circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022169341.5U CN213462413U (en) | 2020-09-28 | 2020-09-28 | Dimming LED lamp circuit |
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| CN213462413U true CN213462413U (en) | 2021-06-15 |
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