Dimming circuit with night lamp function

Abstract

The utility model provides a dimming circuit with a night lamp function. The dimming circuit comprises a rectification module, an LED light source, a selection module and a dimming control module. The input end of the rectifier module is connected with a power supply; the output end of the rectification module is connected with the positive electrode of the LED light source, the control input end of the selection module and the dimming signal input end of the dimming control module. The selection module comprises a first path and a second path which can be gated, and the first path and the second path output different current values; the output end of the dimming control module is connected with the input end of the first path and the input end of the second path. The negative electrode of the LED light source is connected with the output end of the first path and the output end of the second path. The night lamp function and the main lighting function are achieved only through one light source, namely the main lighting state is not affected under the condition that the night lamp state is increased, and cost is reduced. And a dimming control module is also arranged, so that the brightness control in a main lighting state can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of LED circuits, in particular to a dimming circuit with a night light function. Background Art

[0002] In order to realize the main lighting function and the night light function, the existing LED circuits usually need to set up one light source for realizing the main lighting function and another light source for realizing the night light function respectively, and switch between the main lighting function and the night light function by switching the two light sources. However, setting up two light sources increases the number of light sources, which will increase the design cost. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: to provide a dimming circuit with a night light function, which realizes the night light function and the main lighting function through one light source, thereby reducing the cost.

[0004] In order to solve the above technical problem, the technical solution adopted by the utility model is:

[0005] A dimming circuit with a night light function, comprising a rectification module, an LED light source, a selection module and a dimming control module; the input end of the rectification module is used for connecting with a power supply; the output end of the rectification module is respectively connected with the positive electrode of the LED light source, the control input end of the selection module and the dimming signal input end of the dimming control module; the selection module includes a selectable first path and a second path, and different current values are output by the first path and the second path; the output end of the dimming control module is respectively connected with the input end of the first path and the input end of the second path; the negative electrode of the LED light source is connected with the output end of the first path and the output end of the second path.

[0006] Further, the selection module includes a switch chip, a first resistor and a second resistor; the resistance value of the first resistor is different from that of the second resistor; the output end of the dimming control module is respectively connected with one end of the first resistor and one end of the second resistor; the first path and the second path are included inside the switch chip; the other end of the first resistor is connected with the input end of the first path; the other end of the second resistor is connected with the input end of the second path; the output end of the first path and the output end of the second path are connected with the negative electrode of the LED light source; the control input end of the switch chip is connected with the output end of the rectification module, and the voltage change at the output end of the rectification module is detected to select the first path or the second path.

[0007] Further, the resistance value range of the first resistor is 0 - 10 Ω.

[0008] Further, the resistance value range of the second resistor is 10 - 100 Ω.

[0009] Further, the selection module further includes a third resistor, a first capacitor, and a second capacitor; one end of the first power supply terminal of the switch chip is respectively connected to one end of the third resistor and one end of the first capacitor; one end of the second power supply terminal of the switch chip is connected to one end of the second capacitor; the output terminal of the dimming control module is respectively connected to the other end of the third resistor, the other end of the first capacitor, and the other end of the second capacitor.

[0010] Further, the rectification module includes a fuse resistor, a varistor, and a rectifier bridge; one end of the fuse resistor is used to connect to the live wire of the power supply; the other end of the fuse resistor is respectively connected to one end of the varistor and the first input terminal of the rectifier bridge; the other end of the varistor and the second input terminal of the rectifier bridge are used to connect to the neutral wire of the power supply; the output terminal of the rectifier bridge is respectively connected to the positive electrode of the LED light source, the control input terminal of the selection module, and the dimming signal input terminal of the dimming control module.

[0011] Further, a dimmer is further included; the output terminal of the dimmer is connected to the input terminal of the rectification module; the input terminal of the dimmer is used to connect to the power supply.

[0012] Further, the dimming control module includes a thyristor constant current control chip; the dimming signal input terminal of the thyristor constant current control chip is connected to the output terminal of the rectification module; the output terminal of the thyristor constant current control chip is connected to the power supply terminal of the selection module.

[0013] Further, the dimming control module further includes a fourth resistor, a fifth resistor, and a sixth resistor; one end of the fourth resistor is connected to the current discharge terminal of the thyristor constant current control chip; the other end of the fourth resistor is respectively connected to one end of the fifth resistor, one end of the sixth resistor, and the output current control terminal of the thyristor constant current control chip; the other end of the fifth resistor and the other end of the sixth resistor are grounded.

[0014] Further, the dimming control module further includes a seventh resistor; one end of the seventh resistor is connected to the output terminal of the thyristor constant current control chip; the other end of the seventh resistor is connected to the voltage control terminal of the thyristor constant current control chip.

[0015] The beneficial effects of the present utility model are as follows: By outputting different current values from the first output terminal and the second output terminal of the selection module, and selectively connecting the LED light source to the first path or the second path of the selection module, the brightness of the LED light source can be controlled based on the different current values output from the first output terminal or the second output terminal. Thus, the night light function and the main lighting function can be realized by only one light source, that is, without affecting the main lighting state when the night light state is added, the cost is reduced; at the same time, a dimming control module is also provided, which can realize the brightness control in the main lighting state and meet the lighting requirements for different brightness levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic diagram of the modules of a dimming circuit with a night light function in an embodiment of the present utility model;

[0017] Figure 2 FIG. is a schematic diagram of the circuit connection of a dimming circuit with a night light function in an embodiment of the present utility model;

[0018] LABEL DESCRIPTION:

[0019] 1. Rectification module; 2. LED light source; 3. Selection module; 4. Dimming control module; 5. Dimmer;

[0020] IC2. Switch chip; RS4. First resistor; RS5. Second resistor; R3. Third resistor; C1. First capacitor; C2. Second capacitor; F. Fuse resistor; RV. Varistor; BR. Rectifier bridge; IC1. Thyristor constant current control chip; RS1. Fourth resistor; RS2. Fifth resistor; RS3. Sixth resistor; R5. Seventh resistor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To describe in detail the technical content, achieved objectives and effects of the present utility model, the following is described in conjunction with the embodiments and with reference to the accompanying drawings.

[0022] Please refer to Figure 1 , a dimming circuit with a night light function, comprising a rectification module, an LED light source, a selection module and a dimming control module; the input end of the rectification module is used to connect to a power supply; the output end of the rectification module is respectively connected to the positive electrode of the LED light source, the control input end of the selection module and the dimming signal input end of the dimming control module; the selection module includes a selectable first path and a second path, and different current values are output from the first path and the second path; the output end of the dimming control module is respectively connected to the input end of the first path and the input end of the second path; the negative electrode of the LED light source is connected to the output end of the first path and the output end of the second path.

[0023] As can be seen from the above description, the beneficial effects of the present utility model are as follows: By outputting different current values at the first output terminal and the second output terminal of the selection module, and connecting the LED light source to the first path or the second path of the selection module in a selected manner, the brightness of the LED light source can be controlled based on different current values output at the first output terminal or the second output terminal. Thus, the night light function and the main lighting function can be realized through only one light source, that is, when the night light state is added, the main lighting state is not affected, and the cost is reduced. At the same time, a dimming control module is also provided, which can realize the brightness control in the main lighting state and meet the lighting requirements for different brightness levels.

[0024] Further, the selection module includes a switch chip, a first resistor, and a second resistor; the resistance value of the first resistor is different from that of the second resistor; the output terminal of the dimming control module is respectively connected to one end of the first resistor and one end of the second resistor; the first path and the second path are included inside the switch chip; the other end of the first resistor is connected to the input terminal of the first path; the other end of the second resistor is connected to the input terminal of the second path; the output terminals of the first path and the second path are connected to the negative electrode of the LED light source; the control input terminal of the switch chip is connected to the output terminal of the rectification module, and the voltage change at the output terminal of the rectification module is detected to select the first path or the second path.

[0025] As can be seen from the above description, a selection module is formed by a switch chip, a first resistor, and a second resistor, and the first resistor and the second resistor with different resistance values are respectively connected to the first path and the second path of the selection module, so that different current values are formed in the first path and the second path, and thus the night light function and the main lighting function are respectively realized through the first path and the second path.

[0026] Further, the resistance value range of the first resistor is 0 - 10 Ω.

[0027] As can be seen from the above description, by setting the resistance value range of the first resistor to 0 - 10 Ω, a relatively large current can be generated in the first path, thereby realizing the main lighting function.

[0028] Further, the resistance value range of the second resistor is 10 - 100 Ω.

[0029] As can be seen from the above description, by setting the resistance value range of the first resistor to 10 - 100 Ω, a current much smaller than that in the first path can be generated in the second path, thereby realizing the night light function.

[0030] Further, the selection module further includes a third resistor, a first capacitor, and a second capacitor; one end of the third resistor and one end of the first capacitor are respectively connected to the first power supply terminal of the switch chip; one end of the second capacitor is connected to the second power supply terminal of the switch chip; the output terminal of the dimming control module is respectively connected to the other end of the third resistor, the other end of the first capacitor, and the other end of the second capacitor.

[0031] As can be seen from the above description, by setting the first capacitor and the second capacitor, the switch chip can detect the power-off conditions of the first capacitor and the second capacitor to realize the setting of the switching shortest time and the reset time; and, setting the first capacitor to discharge the second capacitor can reduce the shortest switching time.

[0032] Further, the rectification module includes a fuse resistor, a varistor, and a rectifier bridge; one end of the fuse resistor is used to connect to the live wire of the power supply; the other end of the fuse resistor is respectively connected to one end of the varistor and the first input terminal of the rectifier bridge; the other end of the varistor and the second input terminal of the rectifier bridge are used to connect to the neutral wire of the power supply; the output terminal of the rectifier bridge is respectively connected to the positive electrode of the LED light source, the control input terminal of the selection module, and the dimming signal input terminal of the dimming control module.

[0033] As can be seen from the above description, by setting the rectifier bridge, the input mains electricity can be converted into direct current, and by setting the fuse resistor and the varistor, the circuit can be protected against surges.

[0034] Further, a dimmer is further included; the output terminal of the dimmer is connected to the input terminal of the rectification module; the input terminal of the dimmer is used to connect to the power supply.

[0035] As can be seen from the above description, by setting the dimmer, the brightness of the LED can be adjusted based on the dimmer.

[0036] Further, the dimming control module includes a thyristor constant current control chip; the dimming signal input terminal of the thyristor constant current control chip is connected to the output terminal of the rectification module; the output terminal of the thyristor constant current control chip is connected to the power supply terminal of the selection module.

[0037] As can be seen from the above description, using the thyristor constant current control chip as the dimming control module enables the dimming control module to turn on the discharge current according to the connection situation of the dimmer, thereby improving the compatibility of the whole lamp dimming, and further realizing the compatibility of thyristor dimming in both the main lighting and the night light modes.

[0038] Further, the dimming control module further includes a fourth resistor, a fifth resistor, and a sixth resistor; one end of the fourth resistor is connected to the current discharge end of the thyristor constant current control chip; the other end of the fourth resistor is respectively connected to one end of the fifth resistor, one end of the sixth resistor, and the output current control end of the thyristor constant current control chip; the other ends of the fifth resistor and the sixth resistor are grounded.

[0039] As can be seen from the above description, by setting the magnitude of the discharge current through the fourth resistor, the discharge current can be changed to improve the dimming compatibility of the entire lamp; through the fifth resistor and the sixth resistor, the output current of the thyristor constant current control chip can be adjusted.

[0040] Further, the dimming control module further includes a seventh resistor; one end of the seventh resistor is connected to the output end of the thyristor constant current control chip; the other end of the seventh resistor is connected to the voltage control end of the thyristor constant current control chip.

[0041] As can be seen from the above description, the seventh resistor, as a linear adjustment rate resistor, can adjust the voltage of the thyristor constant current control chip to modulate the output current, so that the input voltage is stabilized within a preset voltage range and the power change is reduced.

[0042] The dimming circuit with a night light function provided by the present invention can be applied to the home lighting scenario, and the night light function and the main lighting function can be realized only through one light source. The following is described by specific embodiments:

[0043] Embodiment 1

[0044] Please refer to Figure 1 , a dimming circuit with a night light function, including a rectification module 1, an LED light source 2, a selection module 3, and a dimming control module 4; the input end of the rectification module 1 is used to connect to a power supply; the output end of the rectification module 1 is respectively connected to the positive electrode of the LED light source 2, the control input end of the selection module 3, and the dimming signal input end of the dimming control module 4; the selection module 3 includes a selectable first path and a second path, and different current values are output by the first path and the second path; the output end of the dimming control module 4 is respectively connected to the input end of the first path and the input end of the second path; the negative electrode of the LED light source 2 is connected to the output end of the first path and the output end of the second path; wherein, a dimmer 5 is provided at the input end of the rectification module 1, and the input end of the dimmer 5 is used to connect to the power supply live wire.

[0045] Please refer to Figure 2, the selection module 3 includes a switching chip IC2, a first resistor RS4, a second resistor RS5, a third resistor R3, a first capacitor C1, and a second capacitor C2; wherein, the resistance value range of the first resistor RS4 in this embodiment is 0 - 10Ω, the resistance value range of the second resistor RS5 is 10 - 100Ω, and the resistance value of the first resistor RS4 is different from that of the second resistor RS5; by adjusting the resistance values of the first resistor RS4 and the second resistor RS5, the control of the current magnitudes of the first path and the second path is achieved; the capacitance value of the first capacitor C1 is 4.7uF, the capacitance value of the second capacitor C2 is 4.7uF, the resistance value of the third resistor R3 is 15KΩ; the model of the switching chip IC2 is SM2212; wherein, the figure also includes a resistor R2 (with a resistance value of 51KΩ) and a resistor R4 (with a resistance value of 200KΩ), and the resistance values of the resistors and the capacitance values of the capacitors in the module are adjusted according to the actual situation to obtain appropriate resistance values and capacitance values. The specific connection manner of the module is as follows:

[0046] The output terminals of the dimming control module 4 are respectively connected to one end of the first resistor RS4 and one end of the second resistor RS5; inside the switching chip IC2, there are a first path and a second path; the other end of the first resistor RS4 is connected to the input terminal (REXT1) of the first path; the other end of the second resistor RS5 is connected to the input terminal (REXT2) of the second path; the output terminals (OUT1) of the first path and the output terminal (OUT2) of the second path are connected to the negative electrode of the LED light source 2; the control input terminal (VIN) of the switching chip IC2 is connected to the output terminal of the rectification module 1, and detects the voltage change at the output terminal of the rectification module 1 to select the first path or the second path; that is, by detecting the pulse of the wall switch, the output terminal (OUT1) of the first path and the output terminal (OUT2) of the second path are alternately turned on; the first power supply terminal (VDD) of the switching chip IC2 is respectively connected to one end of the third resistor R3 and one end of the first capacitor C1; the second power supply terminal (VCC) of the switching chip IC2 is connected to one end of the second capacitor C2; the output terminal of the dimming control module 4 is respectively connected to the other ends of the third resistor R3, the first capacitor C1, and the second capacitor C2.

[0047] The rectification module 1 includes a fuse resistor F, a varistor RV, and a rectifier bridge BR; one end of the fuse resistor F is used to connect to the output end of the dimmer 5; the other end of the fuse resistor F is respectively connected to one end of the varistor RV and the first input terminal (pin 2) of the rectifier bridge BR; the other end of the varistor RV and the second input terminal (pin 1) of the rectifier bridge BR are used to connect to the power supply neutral line; the output terminal (pin 3) of the rectifier bridge BR is respectively connected to the positive pole of the LED light source 2, the control input terminal of the selection module 3, and the dimming signal input terminal of the dimming control module 4; among them, a diode D1 is also arranged between the LED light source 2 and the rectifier bridge BR, the specification of the diode D1 is 1A - 600V, the specification of the fuse resistor F is 10Ω - 1W, and the specification of the varistor RV is 241V.

[0048] The dimming control module 4 includes a thyristor constant current control chip IC1, a fourth resistor RS1, a fifth resistor RS2, a sixth resistor RS3, and a seventh resistor R5; among them, in this embodiment, the model of the thyristor constant current control chip IC1 is SM2196; the resistance value ranges of the fourth resistor RS1, the fifth resistor RS2, and the sixth resistor RS3 are 0 - 10Ω; the resistance value of the seventh resistor R5 is 150KΩ, the resistance values of the resistors and the capacitance values of the capacitors in the module are adjusted according to the actual situation, and the specific connection method of the module is as follows:

[0049] The dimming signal input terminal (TRIAC) of the thyristor constant current control chip IC1 is connected to the output terminal (pin 3) of the rectification module 1, and the output terminal (OUT) of the thyristor constant current control chip IC1 is connected to the power supply terminal of the selection module 3; among them, a resistor R1 (with a resistance value of 200 ohms) is also arranged between the dimming signal input terminal (TRIAC) of the thyristor constant current control chip IC1 and the output terminal (pin 3) of the rectification module 1; one end of the fourth resistor RS1 is connected to the current discharge terminal (REXT1) of the thyristor constant current control chip IC1; the other end of the fourth resistor RS1 is respectively connected to one end of the fifth resistor RS2, one end of the sixth resistor RS3, and the output current control terminal (REXT2) of the thyristor constant current control chip IC1; the other ends of the fifth resistor RS2 and the sixth resistor RS3 are grounded; one end of the seventh resistor R5 is connected to the output terminal (OUT) of the thyristor constant current control chip IC1; the other end of the seventh resistor R5 is connected to the voltage control terminal (VT) of the thyristor constant current control chip IC1; an electrolytic capacitor E1 is also arranged between the power supply (VIN) of the thyristor constant current control chip IC1 and the ground, and at the same time, a resistor R4 is connected in parallel at both ends of the electrolytic capacitor E1 to ensure the stable operation of the LED light source 2.

[0050] The working principle of the above dimming circuit with a night light function is as follows:

[0051] When the closing signal of the wall switch is detected, the circuit is powered on and works normally. The switch chip IC2 controls the first path to conduct, enabling the LED light source 2 to be in the main lighting mode. At the same time, in the main lighting mode, the brightness of the LED light source 2 can be controlled through the dimmer 5.

[0052] When the disconnection signal of the wall switch is detected and power is reapplied within the preset time after power-off, for example, when power is reapplied within 3 seconds after the switch is powered off, the switch chip IC2 detects the pulse signal of the wall switch and controls the second path to conduct, enabling the LED light source 2 to be in the night light mode. At the same time, in the night light mode, the brightness of the LED light source 2 can also be controlled through the dimmer 5.

[0053] The above are only the embodiments of the present utility model and do not limit the patent scope of the present utility model accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A dimming circuit with a night light function, characterized in that, It includes a rectification module, an LED light source, a selection module, and a dimming control module; The input end of the rectification module is used to connect to a power supply; The output end of the rectification module is respectively connected to the positive electrode of the LED light source, the control input end of the selection module, and the dimming signal input end of the dimming control module; The selection module includes a selectable first path and a second path, and different current values are output by the first path and the second path; The output end of the dimming control module is respectively connected to the input end of the first path and the input end of the second path; The negative electrode of the LED light source is connected to the output end of the first path and the output end of the second path; 2. The dimming circuit with a night light function according to claim 1, characterized in that, The selection module includes a switching chip, a first resistor, and a second resistor; The resistance value of the first resistor is different from that of the second resistor; The output end of the dimming control module is respectively connected to one end of the first resistor and one end of the second resistor; The first path and the second path are included inside the switching chip; The other end of the first resistor is connected to the input end of the first path; The other end of the second resistor is connected to the input end of the second path; The output end of the first path and the output end of the second path are connected to the negative electrode of the LED light source; The control input end of the switching chip is connected to the output end of the rectification module, and the voltage change at the output end of the rectification module is detected to select the first path or the second path; 3. The dimming circuit with a night light function according to claim 2, characterized in that, The resistance value range of the first resistor is 0 - 10Ω; 4. A dimming circuit with a night light function according to claim 2, characterized in that, The resistance value range of the second resistor is 10 - 100Ω; 5. The dimming circuit with a night light function according to claim 2, characterized in that, The selection module further includes a third resistor, a first capacitor, and a second capacitor; The first power supply end of the switching chip is respectively connected to one end of the third resistor and one end of the first capacitor; The second power supply end of the switching chip is connected to one end of the second capacitor; The output end of the dimming control module is respectively connected to the other end of the third resistor, the other end of the first capacitor, and the other end of the second capacitor; 6. The dimming circuit with a night light function according to claim 1, wherein The rectification module includes a fuse resistor, a varistor, and a rectifier bridge; One end of the fuse resistor is used to connect to the live wire of the power supply; The other end of the fuse resistor is respectively connected to one end of the varistor and the first input end of the rectifier bridge; The other end of the varistor and the second input end of the rectifier bridge are used to connect to the neutral wire of the power supply; The output end of the rectifier bridge is respectively connected to the positive electrode of the LED light source, the control input end of the selection module, and the dimming signal input end of the dimming control module; 7. The dimming circuit with a night light function according to claim 1, characterized in that, It further includes a dimmer; The output end of the dimmer is connected to the input end of the rectification module; The input end of the dimmer is used to connect to a power supply; 8. A dimming circuit with a night light function according to claim 7, characterized in that, The dimming control module includes a thyristor constant current control chip; The dimming signal input end of the thyristor constant current control chip is connected to the output end of the rectification module; The output end of the thyristor constant current control chip is connected to the power supply end of the selection module; 9. A dimming circuit with a night light function according to claim 8, characterized in that, The dimming control module further includes a fourth resistor, a fifth resistor, and a sixth resistor; One end of the fourth resistor is connected to the current discharge end of the thyristor constant current control chip; The other end of the fourth resistor is respectively connected to one end of the fifth resistor, one end of the sixth resistor, and the output current control terminal of the thyristor constant current control chip; The other ends of the fifth resistor and the sixth resistor are grounded.

10. A dimming circuit with a night light function according to claim 8, characterized in that, The dimming control module further includes a seventh resistor; One end of the seventh resistor is connected to the output terminal of the thyristor constant current control chip; The other end of the seventh resistor is connected to the voltage control terminal of the thyristor constant current control chip.

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