A multi-level adjustable light illumination circuit, PCB board and illumination device

Abstract

The present invention relates to the technical field of lighting circuits, and discloses a multi-level dimmable lighting circuit, a PCB board, and a lighting device. The lighting circuit comprises an input control unit, an output unit, a lighting unit, and a dimming unit. The input control unit comprises a control unit, and the dimming unit comprises a first dial unit and a first processing unit; the output end of the input control unit is connected to the input end of the output unit, and the output end of the output unit is connected to the input end of the lighting unit; the input end of the first dial unit is used to receive a dial dimming signal, and the output end thereof is connected to the input end of the first processing unit, and the output end of the first processing unit is connected to the input end of the control unit; the lighting circuit disclosed in the present application comprises a first processing unit, and the first processing unit is used to process the dial dimming signal obtained by the first dial unit, and generate a control instruction to adjust the working state of the control unit to achieve the purpose of dimming, and has the advantages of high control precision and high accuracy.

Description

Technical Field

[0001] The present invention relates to the field of lighting technology, and in particular to a multi-level adjustable light lighting circuit, a PCB board and a lighting device. Background Art

[0002] LED has the advantages of higher light efficiency, lower cost and no pollution, and is increasingly favored by people. Currently, LED bulbs and downlights generally work in a single color. With the humanization and refinement of home decoration and the improvement of modern people's requirements for quality of life, people's demand for indoor lighting and even commercial lighting is no longer a single lighting mode, that is, no longer a demand for a single brightness. People gradually pursue lighting devices that can adjust the brightness of LED lamps anytime, anywhere with simple operations.

[0003] Existing lighting devices generally use the method of adjusting the current-sensing resistor of the main circuit to control the output current. A common method is to achieve this by opening the resistance value of the short-circuit current detection resistor through a dip switch. The adjustment is simple and direct, but the disadvantage is that it directly controls the main circuit, which is a strong signal and is prone to some problems when switching and is usually not easy to use on the primary side. In addition, after the dip switch has been working for a period of time, during the adjustment process, the switch may be located between two gears, affecting the stability of the lighting circuit during operation and the dimming effect of the lighting device.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a multi-level dimmable lighting circuit, which can process the dial code dimming signal and then output it to the control unit, and has the advantages of high dimming precision and high dimming accuracy.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A multi-speed dimmable lighting circuit comprises an input control unit, an output unit, a lighting unit and a dimming unit, wherein the input control unit comprises a control unit, and the dimming unit comprises a first dial unit and a first processing unit; the input end of the input control unit is used to connect to an external power supply device, the output end of the input control unit is connected to the input end of the output unit, the output end of the output unit is connected to the input end of the lighting unit, and the control unit is used to adjust the output electrical signal of the input control unit; the input end of the first dial unit is used to receive a dial dimming signal, the output end of the first dial unit is connected to the input end of the first processing unit, and the output end of the first processing unit is connected to the input end of the control unit.

[0008] In the multi-level dimmable lighting circuit, the lighting unit includes an overcurrent protection unit and a lighting unit, the input end of the overcurrent protection unit is connected to the output end of the output unit, and the output end of the overcurrent protection unit is connected to the input end of the lighting unit.

[0009] The multi-speed dimmable lighting circuit also includes a color temperature adjustment unit, which includes a second dial part and a second processing part. The input end of the second dial part is used to receive a dial color temperature adjustment signal, the output end of the second dial part is connected to the input end of the second processing part, and the output end of the second processing part is connected to the lighting part.

[0010] In the multi-speed dimmable lighting circuit, the input control unit also includes a first rectifier, a first filter, an inductive output unit, a feedback unit and a conductive unit. The input end of the first rectifier is used to connect to an external power supply device, the output end of the first rectifier is respectively connected to the power supply end of the control unit, the input end of the first filter and the transmitting end of the conductive unit, the output end of the first filter is connected to the input end of the inductive output unit, the output end of the inductive output unit is respectively inductively connected to the input end of the output unit and the input end of the feedback unit, the output end of the feedback unit is connected to the conductive unit, and the feedback end of the feedback unit is connected to the feedback end of the control unit.

[0011] In the multi-level dimmable lighting circuit, the dimming unit further includes a first step-down unit, an input end of the first step-down unit is connected to the feedback unit, and an output end of the first step-down unit is connected to a power supply end of the first processing unit.

[0012] In the multi-speed dimmable lighting circuit, the output unit includes a second rectifier, a second filter, and a second step-down unit; the input end of the second rectifier is inductively connected to the output end of the inductive output unit, the output end of the second rectifier is connected to the input end of the second filter, and the output end of the second filter is connected to the input end of the lighting unit; the input end of the second step-down unit is connected to the second filter, and the output end of the second step-down unit is connected to the power supply end of the second processing unit.

[0013] In the multi-speed dimmable lighting circuit, the first dial unit includes a third switch K3, the first processing unit includes a fifth control chip U5, a ninth field effect transistor Q9, a tenth field effect transistor Q10 and an eleventh field effect transistor Q11, the control unit includes a first control chip U1, a first voltage divider group, a second voltage divider group, a third voltage divider group, a fourth voltage divider group, a fourth field effect transistor Q4, a fourth diode D4 and an eleventh capacitor C11; the first pin, the second pin, the third pin, the fifth pin, the sixth pin and the seventh pin of the third switch K3 are respectively The fourth pin of the third switch K3 is grounded; the second pin, the seventh pin and the fifth pin of the fifth control chip U5 are respectively connected to the gate of the ninth field effect transistor Q9, the gate of the tenth field effect transistor Q10 and the gate of the eleventh field effect transistor Q11; the drain of the ninth field effect transistor Q9, the drain of the tenth field effect transistor Q10 and the drain of the eleventh field effect transistor Q11 are respectively connected to one end of the second voltage divider group, the third voltage divider group and the drain of the tenth field effect transistor Q10. The first control chip U1 is connected to the output end of the first rectifying unit, and the other end of the first voltage-dividing group is connected to the first pin of the first control chip U1; the sixth pin, the second pin and the third pin of the first control chip U1 are connected to the feedback end of the feedback unit, the cathode of the fourth diode D4 and the emitter of the conducting unit respectively; the anode of the fourth diode D4 is connected to the gate of the fourth field effect transistor Q4, the drain of the fourth field effect transistor Q4 and one end of the eleventh capacitor C11 are connected to the inductive output unit, and the source of the fourth field effect transistor Q4 and the other end of the eleventh capacitor C11 are connected to the fifth pin of the first control chip U1 respectively.

[0014] In the multi-speed dimmable lighting circuit, the overcurrent protection unit includes a third control chip U3, a sixth diode D6, a thirteenth transistor Q13, a fifteenth transistor Q15, a fourteenth field effect transistor Q14 and a fifth voltage divider group; the anode of the sixth diode D6 and the gate and source of the fourteenth field effect transistor Q14 are respectively connected to the output end of the output unit, the cathode of the sixth diode D6 is connected to the collector of the thirteenth transistor Q13, and the emitter of the thirteenth transistor Q13 is connected to the collector of the thirteenth transistor Q13. The first pin of the third control chip U3 is connected, and the base of the thirteenth transistor Q13 is grounded; the gate of the fourteenth field effect transistor Q14 is also connected to the collector of the fifteenth transistor Q15, the base of the fifteenth transistor Q15 is connected to the seventh pin of the third control chip U3, and the emitter of the fifteenth transistor Q15 is grounded; the drain of the fourteenth field effect transistor Q14 is connected to one end of the fifth voltage divider group, and the other end of the fifth voltage divider group is connected to the input end of the lighting unit.

[0015] The present invention also provides a PCB board accordingly, on which any of the above-mentioned multi-level dimmable lighting circuits is printed.

[0016] The present invention also provides a lighting device accordingly, wherein the lighting device adopts any of the above-mentioned multi-stage dimmable lighting driving circuits to realize operation control.

[0017] Beneficial effect: The present invention provides a multi-speed dimmable lighting circuit, the dimming unit includes a first processing unit, the dial dimming signal obtained by the first dial unit is processed by the first processing unit, and then a corresponding control instruction is generated to adjust the working state of the control unit. The control unit adjusts the output voltage of the input control unit to realize the output of different electrical signals and achieve the purpose of dimming. It has the advantages of high control precision and high dimming accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A circuit block diagram of a multi-level dimmable lighting circuit provided by the present invention;

[0019] Figure 2 A circuit schematic diagram of an input control unit and an output unit provided by the present invention;

[0020] Figure 3 A circuit schematic diagram of a dimming unit provided by the present invention;

[0021] Figure 4 A circuit schematic diagram of the color temperature adjustment unit provided by the present invention;

[0022] Figure 5 This is a circuit schematic diagram of the lighting unit provided by the present invention.

[0023] Explanation of main component symbols: 1-input control unit, 11-control unit, 12-first rectification unit, 13-first filtering unit, 14-sensing output unit, 15-feedback unit, 16-conduction unit, 2-output unit, 21-second rectification unit, 22-second filtering unit, 23-second step-down unit, 3-illumination unit, 31-overcurrent protection unit, 32-illumination unit, 4-dimming unit, 41-first dialing unit, 42-first processing unit, 43-first step-down unit, 5-color temperature adjustment unit, 51-second dialing unit, 52-second processing unit. DETAILED DESCRIPTION

[0024] The present invention provides a multi-level dimmable lighting circuit, a PCB board and a lighting device. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples.

[0025] In the description of the present invention, it should be understood that the terms "installation", "connection" and the like should be understood in a broad sense, and a person skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0026] See also Figures 1 to 5 The present invention provides a multi-level dimmable lighting circuit, including an input control unit 1, an output unit 2, a lighting unit 3 and a dimming unit 4, wherein the input control unit 1 includes a control unit 11, and the dimming unit 4 includes a first dial unit 41 and a first processing unit 42; the input end of the input control unit 1 is used to connect to an external power supply device, the output end of the input control unit 1 is connected to the input end of the output unit 2, the output end of the output unit 2 is connected to the input end of the lighting unit 3, and the control unit 11 is used to adjust the output electrical signal of the input control unit 1; the input end of the first dial unit 41 is used to receive a dial dimming signal, the output end of the first dial unit 41 is connected to the input end of the first processing unit 42, and the output end of the first processing unit 42 is connected to the input end of the control unit 11.

[0027] The present application discloses a multi-level dimmable lighting circuit, in which the dimming unit 4 includes a first processing unit 42. The dial dimming signal obtained by the first dial unit 41 is processed by the first processing unit 42, and then a corresponding control instruction is generated to adjust the working state of the control unit 11. The control unit 11 adjusts the output voltage of the input control unit 1 to achieve the output of different electrical signals and achieve the purpose of dimming. It has the advantages of high control precision and high dimming accuracy. In addition, the first processing unit 42 can identify erroneous dimming actions and generate control instructions accordingly to execute the correct dimming action corresponding to the erroneous dimming action, so as to eliminate the erroneous action caused by the dial switch being located between two gears.

[0028] For further information, see Figure 1 and Figure 5 The lighting unit 3 includes an overcurrent protection unit 31 and a lighting unit 32 , the input end of the overcurrent protection unit 31 is connected to the output end of the output unit 2 , and the output end of the overcurrent protection unit 31 is connected to the input end of the lighting unit 32 .

[0029] In this embodiment, the lighting unit 32 includes a first light group and a second light group, and the first light group and the second light group are respectively composed of a plurality of LED lights connected in series; one end of the first light group and one end of the second light group are respectively connected to the other end of the fifth voltage divider group, and the other end of the first light group and the other end of the second light group are respectively connected to the output end of the second processing unit 52.

[0030] For further information, see Figure 1 and Figure 4 The multi-level dimmable lighting circuit also includes a color temperature adjustment unit 5, which includes a second dial part 51 and a second processing part 52. The input end of the second dial part 51 is used to receive a dial color temperature adjustment signal, the output end of the second dial part 51 is connected to the input end of the second processing part 52, and the output end of the second processing part 52 is connected to the lighting part 32.

[0031] In this example, see Figure 4 The second dial unit 51 includes a second switch K2, and the second processing unit 52 includes a second control chip U2, a seventh field effect transistor Q7 and a sixth field effect transistor Q6; the second switch K2 is used to receive a dial color temperature adjustment signal, and the dial color temperature adjustment signal is triggered by the dial switch. The second switch K2 can achieve 5-speed color temperature adjustment, that is, output 5 different current signals to the second control chip U2; the first pin, the second pin, the fourth pin, the fifth pin and the sixth pin of the second switch K2 are respectively connected to the first pin and the sixth pin of the second control chip U2 through a resistor The first pin of the second switch K2 is connected, the output end of the second step-down unit 23 is respectively connected to the first pin, the third pin and the fourth pin of the second control chip U2; the seventh pin and the fifth pin of the second control chip U2 are respectively connected to the gate of the sixth field effect transistor Q6 and the gate of the seventh field effect transistor Q7; the drain of the sixth field effect transistor Q6 and the drain of the seventh field effect transistor Q7 are respectively connected to the other end of the lighting unit 32, and the source of the sixth field effect transistor Q6 and the source of the seventh field effect transistor Q7 are respectively grounded.

[0032] In this embodiment, the second control chip U2 is a single chip microcomputer, and the model of the second control chip U2 may be XY154.

[0033] For further information, see Figure 1 and Figure 2 The input control unit 1 also includes a first rectifier 12, a first filter 13, an inductive output unit 14, a feedback unit 15 and a conductive unit 16. The input end of the first rectifier 12 is used to connect to an external power supply device. The output end of the first rectifier 12 is respectively connected to the power supply end of the control unit 11, the input end of the first filter 13 and the transmitting end of the conductive unit 16. The output end of the first filter 13 is connected to the input end of the inductive output unit 14. The output end of the inductive output unit 14 is respectively inductively connected to the input end of the output unit 2 and the input end of the feedback unit 15. The output end of the feedback unit 15 is connected to the conductive unit 16. The feedback end of the feedback unit 15 is connected to the feedback end of the control unit 11.

[0034] In this example, see Figure 2 The first rectifier unit 12 includes a first excitation coil L1, a second excitation coil L2 and a first rectifier bridge DB1, one end of the first excitation coil L1 is used to connect an external power supply device, and the external power supply device can be a mains power supply; the other end of the first excitation coil L1 is connected to one end of the second excitation coil L2, and the other end of the second excitation coil L2 is respectively connected to the first pin and the third pin of the first rectifier bridge DB1, and the second pin of the first rectifier bridge DB1 is respectively connected to the input end of the first filtering unit 13, one end of the first voltage divider group and the transmitting end of the conductive unit 16.

[0035] In this example, see Figure 2 The first filtering unit 13 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a third inductor L3 and an eighth resistor R8; one end of the first capacitor C1 and one end of the third inductor L3 are respectively connected to the second pin of the first rectifier bridge DB1, and the other end of the third inductor L3 is respectively connected to one end of the third capacitor C3, one end of the second capacitor C2 and the input end of the induction output unit 14; the other end of the third capacitor C3 is connected to one end of the eighth resistor R8, and the other end of the first capacitor C1, the other end of the second capacitor C2 and the other end of the eighth resistor R8 are respectively grounded.

[0036] In this example, see Figure 2The sensing output unit 14 includes a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a sixteenth resistor R16, a fifteenth resistor R15, a fourteenth resistor R14, a fourth capacitor C4, a first diode D1 and a primary side of a transformer T1; the other end of the third inductor L3 is respectively connected to one end of the seventeenth resistor R17, one end of the eighteenth resistor R18, one end of the nineteenth resistor R19, one end of the fourth capacitor C4 and a first pin of the primary side of the transformer T1; the other end of the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, the fourth capacitor C4 and a first pin of the primary side of the transformer T1; The other end of R18, the other end of the nineteenth resistor R19 and the other end of the fourth capacitor C4 are respectively connected to one end of the sixteenth resistor R16, one end of the fifteenth resistor R15 and one end of the fourteenth resistor R14; the other end of the sixteenth resistor R16, the other end of the fifteenth resistor R15 and the other end of the fourteenth resistor R14 are respectively connected to the cathode of the first diode D1, and the anode of the first diode D1 is respectively connected to the drain of the fourth field effect transistor Q4, one end of the eleventh capacitor C11 and the second pin of the primary side of the transformer T1.

[0037] In this example, see Figure 2 The feedback unit 15 includes a tertiary side of a transformer T1, a second diode D2 and a thirtieth resistor R30; the tertiary side of the transformer T1 is inductively connected to the primary side of the transformer T1, the fifth pin of the tertiary side of the transformer T1 is respectively connected to the positive electrode of the second diode D2, one end of the thirtieth resistor R30 and the input end of the first step-down unit 43, and the other end of the thirtieth resistor R30 is connected to the first and sixth pins of the first control chip U1; the sixth pin of the tertiary side of the transformer T1 is grounded.

[0038] In this embodiment, the conduction part 16 includes a third triode Q3, a third diode D3, a second voltage-regulating tube ZD2 and a sixth voltage-dividing group, and the sixth voltage-dividing group is composed of three resistors connected in series; one end of the sixth voltage-dividing group is connected to the second pin of the first rectifier bridge DB1, and the other end of the sixth voltage-dividing group is connected to the cathode of the third diode D3 and the third pin of the first control chip U1, the cathode of the third diode D3 is connected to the emitter of the third triode Q3, the base of the third triode Q3 is connected to the cathode of the second voltage-regulating tube ZD2, and the positive electrode of the second voltage-regulating tube ZD2 is grounded; the collector of the third triode Q3 is connected to the cathode of the second diode D2.

[0039] In this embodiment, the conduction part 16 is used to realize the rapid shutdown of the input control unit 1, so as to eliminate the afterglow problem when the lighting device is turned off; when the lighting device receives a control instruction to stop working, the third pin of the first control chip U1 stops outputting voltage, and the third transistor Q3 is not turned on, so that the overall circuit of the input control unit 1 stops working immediately, and the lighting device is quickly pulled to the ground to eliminate the afterglow; further, the third pin of the first control chip U1 is connected to the emitter of the third transistor Q3, which can ensure that the conduction part 16 officially starts working when the first control chip U1 works normally, thereby improving the stability and reliability of the input control unit 1 during operation.

[0040] For further information, see Figure 1 and Figure 3 The dimming unit 4 further includes a first step-down unit 43 , an input end of the first step-down unit 43 is connected to the feedback unit 15 , and an output end of the first step-down unit 43 is connected to a power supply end of the first processing unit 42 .

[0041] In this example, see Figure 3 The first step-down unit 43 is used to provide a 5V DC voltage as an input voltage for the first processing unit 42; the first step-down unit 43 includes a fifth diode D5, a twelfth transistor Q12, a seventh capacitor C7 and a fifth voltage regulator ZD5; ​​the anode of the fifth diode D5 is connected to the fifth pin of the tertiary side of the transformer T1, the cathode of the fifth diode D5 is respectively connected to the collector of the twelfth transistor Q12 and the anode of the seventh capacitor C7, the base of the twelfth transistor Q12 is connected to the cathode of the fifth voltage regulator ZD5, and the emitter of the twelfth transistor Q12 is respectively connected to the first pin and the third pin of the fifth control chip U5; the cathode of the seventh capacitor C7 and the anode of the fifth voltage regulator ZD5 are respectively grounded.

[0042] For further information, see Figure 1 and Figure 2 The output unit 2 includes a second rectifier 21, a second filter 22 and a second step-down unit 23; the input end of the second rectifier 21 is inductively connected to the output end of the inductive output unit 14, the output end of the second rectifier 21 is connected to the input end of the second filter 22, and the output end of the second filter 22 is connected to the input end of the lighting unit 3; the input end of the second step-down unit 23 is connected to the second filter 22, and the output end of the second step-down unit 23 is connected to the power supply end of the second processing unit 52.

[0043] In this example, see Figure 2The second rectifier 21 includes the secondary side of the transformer T1 and the eighth rectifier Q8, the second filter 22 includes the thirteenth capacitor C13, the fourteenth capacitor C14, the fifteenth capacitor C15 and the fourth excitation coil L4, the eighth rectifier Q8 is formed by two diodes connected in parallel; the secondary side of the transformer T1 and the primary side of the transformer T1 are inductively connected, the third pin of the secondary side of the transformer T1 is respectively connected to the positive electrode of the eighth rectifier Q8 and the other end of the thirteenth capacitor C13, the negative electrode of the eighth rectifier Q8 is respectively connected to one end of the thirteenth capacitor C13, the positive electrode of the fourteenth capacitor C14, the positive electrode of the fifteenth capacitor C15, the input end of the second step-down part 23 and one end of the fourth excitation coil L4; the other end of the fourth excitation coil L4 is connected to the input end of the overcurrent protection part 31; the negative electrode of the fourteenth capacitor C14 and the negative electrode of the fifteenth capacitor C15 are respectively grounded.

[0044] In this embodiment, the second step-down unit 23 includes a ninth diode D9, a fifth transistor Q5 and a third voltage regulator ZD3, the anode of the ninth diode D9 is connected to the cathode of the eighth rectifier Q8, the cathode of the ninth diode D9 is connected to the collector of the fifth transistor Q5, the base of the fifth transistor Q5 is connected to the cathode of the third voltage regulator ZD3, and the emitter of the fifth transistor Q5 is respectively connected to the first pin, the third pin and the fourth pin of the second control chip U2; the second step-down unit 23 is used to provide a 5V DC voltage as an input voltage for the second processing unit 52.

[0045] For further information, see Figure 2 and Figure 3The first dialing unit 41 includes a third switch K3, the first processing unit 42 includes a fifth control chip U5, a ninth field effect transistor Q9, a tenth field effect transistor Q10 and an eleventh field effect transistor Q11, the control unit 11 includes a first control chip U1, a first voltage division group, a second voltage division group, a third voltage division group, a fourth voltage division group, a fourth field effect transistor Q4, a fourth diode D4 and an eleventh capacitor C11; the first pin, the second pin, the third pin, the fifth pin, the sixth pin and the seventh pin of the third switch K3 are connected to each other through a resistor respectively. The first pin of the fifth control chip U5 is connected, and the fourth pin of the third switch K3 is grounded; the second pin, the seventh pin and the fifth pin of the fifth control chip U5 are respectively connected to the gate of the ninth field effect transistor Q9, the gate of the tenth field effect transistor Q10 and the gate of the eleventh field effect transistor Q11; the drain of the ninth field effect transistor Q9, the drain of the tenth field effect transistor Q10 and the drain of the eleventh field effect transistor Q11 are respectively connected to one end of the second voltage divider group, one end of the third voltage divider group and the One end of the fourth voltage-dividing group is connected correspondingly, and the other end of the second voltage-dividing group, the other end of the third voltage-dividing group and the other end of the fourth voltage-dividing group are respectively connected to the fifth pin of the first control chip U1; the source of the ninth field effect transistor Q9, the source of the tenth field effect transistor Q10 and the source of the eleventh field effect transistor Q11 are respectively grounded; one end of the first voltage-dividing group is connected to the output end of the first rectifying part 12, and the other end of the first voltage-dividing group is connected to the first pin of the first control chip U1; the sixth pin, the second pin and the third pin of the first control chip U1 are respectively connected to the feedback end of the feedback part 15, the cathode of the fourth diode D4 and the emitter of the conducting part 16; the anode of the fourth diode D4 is connected to the gate of the fourth field effect transistor Q4, the drain of the fourth field effect transistor Q4 and one end of the eleventh capacitor C11 are connected to the inductive output part 14, and the source of the fourth field effect transistor Q4 and the other end of the eleventh capacitor C11 are respectively connected to the fifth pin of the first control chip U1.

[0046] In this embodiment, the first voltage-dividing group is composed of three resistors connected in series, and the second voltage-dividing group, the third voltage-dividing group and the fourth voltage-dividing group are respectively composed of two resistors connected in parallel; the fifth control chip U5 is a single-chip microcomputer, and the model of the fifth control chip U5 can be XY145; the model of the first control chip U1 is SE8230.

[0047] In this embodiment, the third switch K3 can realize the input of 6 types of dial dimming signals, that is, realize 6 levels of brightness adjustment; the third switch K3 feeds back the dial dimming signal to the fifth control chip U5, and the fifth control chip U5 controls and adjusts the conduction relationship of the ninth field effect transistor Q9, the tenth field effect transistor Q10 and the eleventh field effect transistor Q11 according to the received dial dimming signal, so as to adjust the connection relationship between the second voltage divider group, the third voltage divider group and the fourth voltage divider group and the sensing output part 14, and adjusts the feedback signal received by the fifth pin of the first control chip U1, so as to realize the adjustment of the working state of the sensing output part 14, so that the output unit 2 outputs different electrical signals to the lighting unit 3, thereby achieving the purpose of dimming.

[0048] For further information, see Figure 2 and Figure 5 The overcurrent protection unit 31 includes a third control chip U3, a sixth diode D6, a thirteenth transistor Q13, a fifteenth transistor Q15, a fourteenth field effect transistor Q14 and a fifth voltage divider group; the anode of the sixth diode D6 and the gate and source of the fourteenth field effect transistor Q14 are respectively connected to the output end of the output unit 2, the cathode of the sixth diode D6 is connected to the collector of the thirteenth transistor Q13, and the emitter of the thirteenth transistor Q13 is connected to the third control chip U3. The first pin of the chip U3 is connected, and the base of the thirteenth transistor Q13 is grounded; the gate of the fourteenth field effect transistor Q14 is also connected to the collector of the fifteenth transistor Q15, the base of the fifteenth transistor Q15 is connected to the seventh pin of the third control chip U3, and the emitter of the fifteenth transistor Q15 is grounded; the drain of the fourteenth field effect transistor Q14 is connected to one end of the fifth voltage dividing group, and the other end of the fifth voltage dividing group is connected to the input end of the lighting unit 32.

[0049] In this embodiment, the fifth voltage divider group is composed of four resistors connected in series, and the lighting unit 32 includes two groups of LED lamp beads with different color temperatures, one group of which can be LED lamp beads with a color temperature of 6000K, and the other group of which can be LED lamp beads with a color temperature of 3000K; the third control chip U3 is a single-chip microcomputer, and the model of the third control chip U3 can be XY145.

[0050] In this embodiment, the overcurrent protection unit 31 is used to implement overcurrent protection. When there is an overcurrent problem in the lighting circuit, the voltage at both ends of the fifth voltage divider group changes, and the voltage of the fifth pin and the sixth pin of the third control chip U3 connected to the two ends of the fifth voltage divider group changes. The fifth pin and the sixth pin of the third control chip U3 are sampling pins. The third control chip U3 adjusts the output of its seventh pin according to the change of the sampling voltage, and adjusts the working state of the fifteenth transistor Q15 by outputting a high level or a low level through the seventh pin, so that the fourteenth field effect transistor Q14 is cut off to cut off the loop between the output unit 2 and the lighting unit 32, protect the LED lamp beads of the lighting unit 32, and improve the stability and safety of the lighting circuit during operation.

[0051] In this embodiment, the drain of the seventh field effect transistor Q7 and the drain of the sixth field effect transistor Q6 are respectively connected to the other end of the two groups of LED lamp beads; the user inputs a 5-speed color temperature adjustment instruction through the dial switch, and the second control chip U2 outputs a control signal to adjust the working state of the seventh field effect transistor Q7 and the sixth field effect transistor Q6, so that the two groups of LED lamp beads are mixed together according to different power ratios to achieve any color temperature of 3000K-6000K, that is, color mixing is achieved to obtain the color temperature required by the customer; the dial color temperature adjustment signal fed back by the second dial part 51 is processed by the second processing unit 52, which has the advantages of high color temperature adjustment precision and high accuracy, and can avoid the problem of malfunction caused by the dial switch being located between two gears.

[0052] The present invention also provides a PCB board accordingly, on which any of the above-mentioned multi-level dimmable lighting circuits is printed.

[0053] The present invention also provides a lighting device accordingly, wherein the lighting device adopts any of the above-mentioned multi-stage dimmable lighting driving circuits to realize operation control.

[0054] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A multi-level dimmable lighting circuit, characterized in that: It includes an input control unit, an output unit, a lighting unit and a dimming unit, wherein the input control unit includes a control unit, and the dimming unit includes a first dial unit and a first processing unit; the input end of the input control unit is used to connect to an external power supply device, the output end of the input control unit is connected to the input end of the output unit, the output end of the output unit is connected to the input end of the lighting unit, and the control unit is used to adjust the output electrical signal of the input control unit; the input end of the first dial unit is used to receive a dial dimming signal, the output end of the first dial unit is connected to the input end of the first processing unit, and the output end of the first processing unit is connected to the input end of the control unit; The first dialing unit includes a third switch K3, the first processing unit includes a fifth control chip U5, a ninth field effect transistor Q9, a tenth field effect transistor Q10 and an eleventh field effect transistor Q11, the control unit includes a first control chip U1, a second voltage division group, a third voltage division group and a fourth voltage division group; the first pin, the second pin, the third pin, the fifth pin, the sixth pin and the seventh pin of the third switch K3 are respectively connected to the first pin of the fifth control chip U5 through a resistor, and the fourth pin of the third switch K3 is grounded; the second pin, the seventh pin and the fifth pin of the fifth control chip U5 are respectively connected to the gate of the ninth field effect transistor Q9, the gate of the tenth field effect transistor Q10 and the gate of the eleventh field effect transistor The gate of the ninth field effect transistor Q9 is connected accordingly; the drain of the ninth field effect transistor Q10 and the drain of the eleventh field effect transistor Q11 are connected to one end of the second voltage division group, one end of the third voltage division group and one end of the fourth voltage division group respectively, and the other end of the second voltage division group, the other end of the third voltage division group and the other end of the fourth voltage division group are connected to the fifth pin of the first control chip U1 respectively; the source of the ninth field effect transistor Q9, the source of the tenth field effect transistor Q10 and the source of the eleventh field effect transistor Q11 are grounded respectively; the model of the fifth control chip U5 is XY145; the model of the first control chip U1 is SE8230; The dimming unit includes a first processing unit. The first processing unit processes the dial dimming signal obtained by the first dial unit and then generates a corresponding control instruction to adjust the working state of the control unit. The control unit adjusts the output voltage of the input control unit to achieve the output of different electrical signals and achieve the purpose of dimming. It has the advantages of high control precision and high dimming accuracy. In addition, the first processing unit can identify the wrong dimming action and generate a control instruction accordingly to execute the correct dimming action corresponding to the wrong dimming action, so as to eliminate the malfunction caused by the dial switch being between two gears. The third switch K3 can realize the input of 6 kinds of dial dimming signals, that is, realize 6 levels of brightness adjustment; the third switch K3 feeds back the dial dimming signal to the fifth control chip U5, and the fifth control chip U5 controls and adjusts the conduction relationship of the ninth field effect transistor Q9, the tenth field effect transistor Q10 and the eleventh field effect transistor Q11 according to the received dial dimming signal, so as to adjust the connection relationship between the second voltage divider group, the third voltage divider group and the fourth voltage divider group and the sensing output part, and adjusts the feedback signal received by the fifth pin of the first control chip U1, so as to realize the adjustment of the working state of the sensing output part, so that the output unit outputs different electrical signals to the lighting unit, so as to achieve the purpose of dimming; The lighting unit comprises an overcurrent protection unit and a lighting unit, wherein the input end of the overcurrent protection unit is connected to the output end of the output unit, and the output end of the overcurrent protection unit is connected to the input end of the lighting unit; The overcurrent protection unit includes a third control chip U3, a sixth diode D6, a thirteenth transistor Q13, a fifteenth transistor Q15, a fourteenth field effect transistor Q14 and a fifth voltage divider group; the anode of the sixth diode D6 and the gate and source of the fourteenth field effect transistor Q14 are respectively connected to the output end of the output unit, the cathode of the sixth diode D6 is connected to the collector of the thirteenth transistor Q13, the emitter of the thirteenth transistor Q13 is connected to the first pin of the third control chip U3, and the base of the thirteenth transistor Q13 is grounded; the gate of the fourteenth field effect transistor Q14 is also connected to the collector of the fifteenth transistor Q15, the base of the fifteenth transistor Q15 is connected to the seventh pin of the third control chip U3, and the emitter of the fifteenth transistor Q15 is grounded; the drain of the fourteenth field effect transistor Q14 is connected to one end of the fifth voltage divider group, and the other end of the fifth voltage divider group is connected to the input end of the lighting unit; The model of the third control chip U3 is XY145.

2. A multi-level dimmable lighting circuit according to claim 1, characterized in that: It also includes a color temperature adjustment unit, which includes a second dial part and a second processing part. The input end of the second dial part is used to receive a dial color temperature adjustment signal, the output end of the second dial part is connected to the input end of the second processing part, and the output end of the second processing part is connected to the lighting part.

3. A multi-level dimmable lighting circuit according to claim 2, characterized in that: The input control unit also includes a first rectifier, a first filter, an inductive output, a feedback and a conductive part. The input end of the first rectifier is used to connect to an external power supply device. The output end of the first rectifier is respectively connected to the power supply end of the control part, the input end of the first filter and the transmitting end of the conductive part. The output end of the first filter is connected to the input end of the inductive output part. The output end of the inductive output part is respectively inductively connected to the input end of the output unit and the input end of the feedback part. The output end of the feedback part is connected to the conductive part. The feedback end of the feedback part is connected to the feedback end of the control part.

4. The multi-level dimmable lighting circuit according to claim 3, characterized in that: The dimming unit further includes a first step-down unit, an input end of the first step-down unit is connected to the feedback unit, and an output end of the first step-down unit is connected to a power supply end of the first processing unit.

5. The multi-level dimmable lighting circuit according to claim 3, characterized in that: The output unit includes a second rectifier, a second filter, and a second step-down unit; the input end of the second rectifier is inductively connected to the output end of the inductive output unit, the output end of the second rectifier is connected to the input end of the second filter, and the output end of the second filter is connected to the input end of the lighting unit; the input end of the second step-down unit is connected to the second filter, and the output end of the second step-down unit is connected to the power supply end of the second processing unit.

6. The multi-level dimmable lighting circuit according to claim 3, characterized in that: The control unit also includes a first voltage-dividing group, a fourth field effect transistor Q4, a fourth diode D4 and an eleventh capacitor C11; one end of the first voltage-dividing group is connected to the output end of the first rectifier unit, and the other end of the first voltage-dividing group is connected to the first pin of the first control chip U1; the sixth pin, the second pin and the third pin of the first control chip U1 are respectively connected to the feedback end of the feedback unit, the cathode of the fourth diode D4 and the emitter of the conduction unit; the anode of the fourth diode D4 is connected to the gate of the fourth field effect transistor Q4, the drain of the fourth field effect transistor Q4 and one end of the eleventh capacitor C11 are connected to the induction output unit, and the source of the fourth field effect transistor Q4 and the other end of the eleventh capacitor C11 are respectively connected to the fifth pin of the first control chip U1.

7. A PCB board, characterized in that: The PCB board is printed with the multi-level dimmable lighting circuit as described in any one of claims 1 to 6.

8. A lighting device, characterized in that: The lighting device uses the multi-stage dimmable lighting drive circuit as described in any one of claims 1 to 6 to achieve working control.

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