LED lamp and LED lamp single-current dimming and color temperature adjusting circuit

Abstract

The utility model discloses an LED lamp and an LED lamp single-current dimming and color temperature adjusting circuit, and belongs to the technical field of LED driving, the LED lamp single-current dimming and color temperature adjusting circuit comprises a constant current source module, a controller, an LED light emitting module, a voltage sampling module and a dimming and color temperature adjusting control module, and the LED lamp comprises the LED lamp single-current dimming and color temperature adjusting circuit; the LED light-emitting module comprises a plurality of groups of LED lamp light-emitting sub-modules with different color temperatures, and each LED lamp light-emitting sub-module comprises an initial light-emitting sub-module and an adjustable light-emitting sub-module; the plurality of groups of LED lamp light-emitting sub-modules are connected in parallel and then are connected to positive and negative electrodes of the constant-current source module through the voltage sampling module and the dimming and color-adjusting control module, and the controller can adjust the output current of the constant-current source module; the voltage sampling module can collect the voltage of the output end of the initial light-emitting sub-module and transmit the voltage to the light and color adjusting control module, and the light and color adjusting control module can generate a corresponding control signal according to the voltage. The problem that the brightness and the chromaticity of an existing traditional lamp cannot be synchronously adjusted is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of LED driving, and in particular relates to an LED lamp and a single current dimming and color temperature adjusting circuit for an LED lamp. Background Art

[0002] Traditional dimming and color adjustment lamps are realized by dual or single channels plus additional color temperature control signals. If you want a certain brightness and color temperature, you need to use a specific dimming and color adjustment controller plus software and hardware to modulate and switch. The brightness and color temperature must be adjusted separately each time. At the same time, the switching is complicated, the software and hardware costs are expensive, and the wiring entering the lamp is cumbersome and prone to errors. The large number of components also affects the stability and life of the lamp, and it lacks practicality.

[0003] Based on the above analysis, the present application designs an LED lamp and a single current dimming and color temperature adjusting circuit for an LED lamp. Utility Model Content

[0004] The utility model aims to provide an LED lamp and a single current dimming and color temperature adjusting circuit for an LED lamp, so as to solve the problem that the existing traditional lamps cannot adjust the brightness and chromaticity synchronously.

[0005] The utility model provides an LED lamp and an LED lamp single-current dimming and color temperature adjustment circuit, comprising a constant current source module, a controller, an LED light-emitting module, a voltage sampling module and a dimming and color adjustment control module, wherein the LED light-emitting module comprises a plurality of groups of LED light-emitting submodules with different color temperatures, wherein the plurality of groups of LED light-emitting submodules comprise an initial light-emitting submodule and an adjustment light-emitting submodule, and after being connected in parallel, the plurality of groups of LED light-emitting submodules are connected to the positive and negative electrodes of the constant current source module through the voltage sampling module and the dimming and color adjustment control module; the controller can adjust the output current of the constant current source module and thus adjust the current entering the LED light-emitting module to achieve brightness adjustment; the voltage sampling module can collect the output terminal voltage of the initial light-emitting submodule and transmit it to the dimming and color adjustment control module, and the dimming and color adjustment control module can generate a control signal according to the voltage to control whether the circuit of the adjustment light-emitting submodule is connected, and then use the control signal to control the light emission of each of the adjustment light-emitting submodules to achieve synchronous regulation of brightness and color temperature.

[0006] As a preferred solution of the present application, multiple groups of LED lamp light-emitting sub-modules with different color temperatures are respectively composed of multiple LED lamp beads of corresponding color temperatures connected in series, wherein a diode is also connected in series in the LED lamp light-emitting sub-module, and the cathode of the diode is connected to the output end of the dimming and color adjustment control module; the number of LED lamp beads connected in series in the initial light-emitting sub-module is greater than the number of LED lamp beads connected in series in the adjustment light-emitting sub-module.

[0007] As a preferred solution of the present application, the dimming and color adjustment control module at least includes a voltage stabilizing circuit and a comparison circuit. The dimming and color adjustment control module stabilizes and compares the voltage collected by the voltage sampling module and then outputs a control voltage to control the diode to be turned on or off.

[0008] As a preferred solution of the present application, the LED light-emitting module includes two groups, namely, a cold-color LED lamp light-emitting sub-module and a warm-color LED lamp light-emitting sub-module.

[0009] As a preferred embodiment of the present application, it includes a voltage divider circuit, which includes a first voltage divider resistor and a second voltage divider resistor, wherein one end of the first voltage divider resistor is connected to the positive output terminal of the constant current source module, and the other end is connected to the input terminal of the LED light-emitting module, and one end of the second voltage divider resistor is connected to the output terminal of the initial light-emitting submodule, and the other end is connected to the negative output terminal of the constant current source module.

[0010] As a preferred solution of the present application, the voltage sampling module includes a sampling circuit, which is connected to both ends of the second voltage-dividing resistor and is used to collect the voltage on the second voltage-dividing resistor and transmit it to the dimming and color adjustment control module.

[0011] The utility model also provides an LED lamp, which comprises the LED lamp single current dimming and color temperature adjusting circuit described in any one of the above items.

[0012] Compared with the prior art, the advantages of the LED lamp and the LED lamp single current dimming and color temperature adjustment circuit in this application are:

[0013] The dimming and color temperature adjustment circuit includes a constant current source module, a controller, an LED light-emitting module, a voltage sampling module and a dimming and color adjustment control module. The LED light-emitting module includes a plurality of groups of LED light-emitting submodules with different color temperatures. The plurality of groups of LED light-emitting submodules include an initial light-emitting submodule and an adjustment light-emitting submodule. The controller can adjust the output current of the constant current source module and then adjust the current entering the LED light-emitting module to achieve brightness adjustment. The voltage sampling module can collect the output terminal voltage of the initial light-emitting submodule and transmit it to the dimming and color adjustment control module. The dimming and color adjustment control module can generate a control signal according to the output voltage to control whether the circuits of each adjustment light-emitting submodule are connected. A control signal is provided, and the control signal is used to control at least one light-emitting submodule to emit light so as to achieve the regulation of the overall brightness and color temperature of the LED light-emitting module; that is, the solution of the present application can achieve the synchronous regulation of brightness and color temperature only by a single control of the current entering the LED light-emitting module, so that the color temperature changes with the brightness, and there is no need for separate switching and adjustment, which simplifies the lamp brightness and color temperature regulation procedures and the circuit wiring design. This is not only convenient to operate, but also prolongs the service life of the circuit and the lamp, reduces the cost of use, has good economic benefits, and solves the problem in the existing market that dual-path current conduction ratio needs to be adjusted to achieve brightness and color temperature regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A control schematic diagram of a single current dimming and color temperature adjustment circuit provided in an embodiment of the utility model.

[0015] Figure 2 A circuit diagram of a single current dimming and color temperature adjustment circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below in conjunction with specific implementations and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its application.

[0017] like Figure 1The single current dimming and color temperature adjustment circuit of the LED lamp provided in this embodiment includes a constant current source module, a controller, an LED light-emitting module, a brightness adjustment module, a voltage sampling module and a dimming and color adjustment control module; the constant current source module provides a stable AC current; the controller can control the output current value of the constant current source module; the LED light-emitting module includes multiple groups of LED light-emitting sub-modules with different color temperatures, and the multiple groups of LED light-emitting sub-modules include initial light-emitting sub-modules and adjustment light-emitting sub-modules. It can be understood that the number of initial light-emitting sub-modules and adjustment light-emitting sub-modules is set according to actual conditions. In this embodiment, the initial light-emitting sub-module preferably includes one group, and the rest are adjustment light-emitting sub-modules. After the multiple groups of LED light-emitting sub-modules are connected in parallel, they are connected to the positive and negative poles of the constant current source module through the brightness adjustment module, the voltage sampling module and the dimming and color adjustment control module; the controller can adjust the output current of the constant current source module and then adjust the current entering the LED light-emitting module to achieve brightness adjustment of each LED light-emitting sub-module; the voltage sampling module can collect the initial light-emitting sub-modules The output terminal voltage of the module is collected and transmitted to the dimming and color adjustment control module. It can be understood that the output terminal voltage should correspond to the current flowing through the initial light-emitting submodule, so that the current flowing through the initial light-emitting submodule can be converted and judged according to the collected output terminal voltage; the dimming and color adjustment control module can generate a control signal to control whether the circuit of each adjusting light-emitting submodule is connected according to the voltage, and then use the control signal to control the light emission of each adjusting light-emitting submodule, so as to realize the light emission of LED lamp light-emitting submodules with different color temperatures, thereby realizing the regulation of the overall brightness and color temperature of the LED light-emitting module. It can be understood that in the initial state of this embodiment, only the initial light-emitting submodule circuit is turned on, that is, only the LED lamp light-emitting submodule with a specific color temperature emits light. When the output voltage of the LED lamp light-emitting submodule with a specific color temperature meets the preset conditions in the dimming and color adjustment control module, the circuit of at least one group of adjusting light-emitting submodules is turned on, that is, the circuits of the remaining color temperature LED lamp light-emitting submodules are connected to regulate the brightness and color temperature through a mixture of brightness and color temperature.

[0018] Multiple groups of LED lamp light-emitting sub-modules with different color temperatures are respectively composed of multiple LED lamp beads of corresponding color temperatures connected in series. The specific number of LED lamp beads connected in series is selected according to actual needs. Among them, a diode is also connected in series in the LED lamp light-emitting sub-module, and the cathode of the diode is connected to the output end of the dimming and color adjustment control module. In this way, the diode can be controlled to be turned on or off according to the output voltage of the output end of the dimming and color adjustment control module, and then the corresponding adjustment light-emitting sub-module circuit can be controlled to be turned on or off, thereby realizing the adjustment of the overall brightness of the LED light-emitting module and the mixed control of color temperature.

[0019] For the convenience of switching, it is preferred that the number of LED lamp beads connected in series in the initial light-emitting sub-module is greater than the number of LED lamp beads connected in series in the adjustment light-emitting sub-module, so that a voltage difference can be formed between the initial light-emitting sub-module and the adjustment light-emitting sub-module. The existence of this voltage difference can affect the distribution of current. At the same time, in conjunction with the dimming and color adjustment control module, the on-off switching between the initial light-emitting sub-module and the adjustment light-emitting sub-module can be achieved, thereby realizing the conversion from one color temperature to another.

[0020] In order to prevent high voltage from damaging the LED lamp beads in the LED light-emitting module, a corresponding voltage-dividing circuit can be set to ensure that the voltage and current entering the LED light-emitting module meet actual needs. In this embodiment, the voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor, wherein one end of the first voltage-dividing resistor is connected to the positive output electrode of the constant current source module, and the other end is connected to the input end of the LED light-emitting module, one end of the second voltage-dividing resistor is connected to the output end of the initial light-emitting sub-module, and the other end is connected to the negative output electrode of the constant current source module, and the voltage on the second voltage-dividing resistor is the output end voltage of the initial light-emitting sub-module.

[0021] The voltage sampling module includes a sampling circuit, which is connected to both ends of the second voltage-dividing resistor and is used to collect the voltage on the second voltage-dividing resistor and transmit it to the dimming and color-adjusting control module.

[0022] The dimming and color adjustment control module includes a voltage stabilizing circuit and a comparison circuit. The dimming and color adjustment control module stabilizes and compares the voltage collected by the voltage sampling module and then outputs a control voltage to control the diode to be turned on or off. In other embodiments of the present application, the dimming and color adjustment control module can also be an existing common control chip, such as a single-chip microcomputer.

[0023] like Figure 2 The above is a specific single-current dimming and color temperature adjustment circuit provided in this embodiment. In this circuit, the voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor, wherein the first voltage-dividing resistor is composed of resistors R1 and R2 connected in parallel, and the second voltage-dividing resistor is composed of resistors R3 and R4 connected in parallel. It can be understood that the voltage-dividing resistor can be selected and set according to the voltage in the actual circuit; the sampling circuit includes resistors R5, R6 and capacitor C2, one end of the resistor R5 is connected to one end of the resistor R4 connected to the output end of the initial light-emitting sub-module, and the other end is connected to the input end of the dimming and color adjustment control module, the resistor R6 and the capacitor C4 are connected in parallel with each other and one end thereof is respectively connected to the two ends of the resistor R5, and the other end is connected to the output negative electrode of the constant current source module.

[0024] The LED light-emitting module includes two groups, namely, a cold-color LED lamp light-emitting submodule, namely, a DC lamp group, and a warm-color LED lamp light-emitting submodule, namely, a DW lamp group. Among them, the DC lamp group is an initial light-emitting submodule, and the DW lamp group is an adjusted light-emitting submodule.

[0025] The dimming and color adjustment control module is an integrated module with at least a voltage stabilization circuit and a comparison circuit, hereinafter referred to as U.

[0026] In specific use, the controller starts the constant current source module to provide an initial current to the LED light module. The initial current can turn on the DC lamp group and maximize its brightness. Since the current passing through the DC lamp group is the largest, the voltage divided by R3 and R4 through the DC lamp group is also the largest. At the same time, the voltage sampling circuit performs sampling, and R5 and R6 sample and divide the voltage across the resistor R4 and then give the collected voltage to the dimming and color control module U. After the voltage stabilization and comparison circuits inside U output the control voltage, the control voltage can close the channel flowing through U through the DW lamp group. At this time, the brightness and color temperature of the LED light module are the largest. The output current of the constant current source module is adjusted by the controller. As the current gradually decreases, the DC lamp group flows through R3 and the color temperature increases. , the voltage on R4 also gradually decreases, and the sampling circuit collects the voltage across R4 again and transmits it to U. After passing through the voltage stabilization and comparison circuits inside U again, the channel flowing through U through the DW lamp group is gradually opened. At this time, the low color temperature lamp group is gradually turned on, and after color mixing, the overall color temperature gradually becomes lower; until the low color temperature of the DW lamp group is fully turned on, due to the different number of LED lamp beads in series in the DW lamp group and the DC lamp group, there is a voltage difference after the two lamp groups are turned on. When the DW lamp group is turned on and fully turned on, the voltage of the DC lamp group will be pulled down and clamped, which will cause the DC lamp group to be unable to divide more current and gradually become smaller. At this time, the DC lamp group, that is, the high color temperature lamp group, is almost completely off; conversely, the DC lamp group can be gradually turned on by gradually increasing the current.

[0027] In summary, the scheme of this embodiment can achieve synchronous regulation of brightness and color temperature only by single control of the current entering the LED light-emitting module, so that the color temperature changes with the brightness, and there is no need for separate switching and adjustment. This simplifies the lamp brightness and color temperature control procedures, and also simplifies the circuit wiring design. This is not only convenient to operate, but also increases the service life of the circuit and the lamp, reduces the cost of use, and has good economic benefits.

[0028] This embodiment further provides an LED lamp, which includes the LED lamp single current dimming and color temperature adjustment circuit as described in the above embodiment.

[0029] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several improvements can be made without departing from the premise of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A single current dimming and color temperature adjustment circuit for LED lamps, characterized in that: It includes a constant current source module, a controller, an LED light-emitting module, a voltage sampling module and a dimming and color adjustment control module. The LED light-emitting module includes multiple groups of LED light-emitting submodules with different color temperatures. The multiple groups of LED light-emitting submodules include initial light-emitting submodules and adjustment light-emitting submodules. After the multiple groups of LED light-emitting submodules are connected in parallel, they are connected to the positive and negative electrodes of the constant current source module through the voltage sampling module and the dimming and color adjustment control module. The controller can adjust the output current of the constant current source module and then adjust the current entering the LED light-emitting module to achieve brightness adjustment; the voltage sampling module can collect the output voltage of the initial light-emitting sub-module and transmit it to the dimming and color adjustment control module. The dimming and color adjustment control module can generate a control signal based on the voltage to control whether the circuit of the light-emitting sub-module is connected, and then use the control signal to control the light emission of each light-emitting sub-module to achieve synchronous regulation of brightness and color temperature.

2. The LED lamp single current dimming and color temperature adjustment circuit according to claim 1, characterized in that: The multiple groups of LED lamp light-emitting sub-modules with different color temperatures are respectively composed of multiple LED lamp beads with corresponding color temperatures connected in series, wherein a diode is also connected in series in the LED lamp light-emitting sub-module, and the cathode of the diode is connected to the output end of the dimming and color adjustment control module; the number of LED lamp beads connected in series in the initial light-emitting sub-module is greater than the number of LED lamp beads connected in series in the adjustment light-emitting sub-module.

3. The LED lamp single current dimming and color temperature adjustment circuit according to claim 2, characterized in that: The dimming and color adjustment control module at least includes a voltage stabilizing circuit and a comparison circuit. The dimming and color adjustment control module stabilizes and compares the voltage collected by the voltage sampling module and then outputs a control voltage to control the diode to be turned on or off.

4. The LED lamp single current dimming and color temperature adjusting circuit according to claim 1, characterized in that: The LED light-emitting module comprises two groups, namely a cold-color LED lamp light-emitting sub-module and a warm-color LED lamp light-emitting sub-module.

5. The LED lamp single current dimming and color temperature adjusting circuit according to claim 1, characterized in that: It comprises a voltage-dividing circuit, which comprises a first voltage-dividing resistor and a second voltage-dividing resistor, wherein one end of the first voltage-dividing resistor is connected to the positive output of the constant current source module, and the other end is connected to the input end of the LED light-emitting module, and one end of the second voltage-dividing resistor is connected to the output end of the initial light-emitting submodule, and the other end is connected to the negative output of the constant current source module.

6. The LED lamp single current dimming and color temperature adjusting circuit according to claim 5, characterized in that: The voltage sampling module includes a sampling circuit, which is connected to both ends of the second voltage-dividing resistor and is used to collect the voltage on the second voltage-dividing resistor and transmit it to the dimming and color-adjusting control module.

7. An LED lamp, characterized in that: The LED lamp comprises the LED lamp single current dimming and color temperature adjustment circuit as described in any one of claims 1 to 6.

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