CN210157440U

CN210157440U - Color temperature adjustable LED lamp circuit device

Info

Publication number: CN210157440U
Application number: CN201920452255.XU
Authority: CN
Inventors: 谢潮声; 何家伟; 邓志强; 李松容
Original assignee: Mosway Semiconductor Ltd
Current assignee: Mosway Semiconductor Ltd
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2020-03-17
Anticipated expiration: 2029-04-04

Abstract

The utility model discloses a color temperature adjustable LED lamp circuit device, which comprises at least two groups of LED lamp bead groups, wherein each group is connected with at least one LED lamp bead in series, and the two groups of LED lamp bead groups adopt LED lamp beads with different color temperatures; the two groups of LED lamp bead groups are connected in series, and any selected one of the two groups of LED lamp bead groups is connected with a variable shunt circuit unit in parallel, so that the current change rates of the two groups of LED lamp beads are ensured to be different. The utility model discloses LED lamp circuit arrangement of adjustable colour temperature is owing to adopted the LED lamp pearl group of two sets of different colour temperatures to carry out series connection's mode to realize the different proportions of the current change of two sets of LED lamp group, thereby need not organize the outfit that carries out the drive circuit unit to every LED lamp pearl, thereby realize that the circuit is simpler, and control is easier, and development cost is lower.

Description

Color temperature adjustable LED lamp circuit device

Technical Field

The utility model relates to a circuit improves, what especially relate to is a LED lamp circuit arrangement of adjustable colour temperature.

Background

In the prior art, LED color temperature regulation (also called Dim-To-wave, wave-Dimming, Dim-Tone, Tunablewhite and the like) is To control the current of two or more groups of LED lamp beads with different color temperatures, and achieve the purpose of changing the color temperature by changing the brightness ratio of the LED lamp beads or the lamp bead groups. The LED lamp light with different color temperatures has different cold and warm feelings, for example, white light and blue light are cold tones, and yellow light and red light are warm tones. The LED lamp beads or the lamp bead groups with at least two groups of different color temperatures are utilized, for example, the LED lamp beads or the lamp bead groups can be white with cold light and yellow with warm light, or the LED lamp beads or the lamp bead groups with the warm light (yellow light) with different color temperatures.

At present, at least two groups of LED lamps or lamp groups are connected in parallel to realize common LED lamps with adjustable color temperature, and two groups of different adjustable power supplies and corresponding control units are respectively utilized to change the currents of the two groups of LED lamp beads at different rates, so that the brightness proportion of the LED lamp beads is changed, and the effect of changing the color temperature is achieved.

As shown in fig. 1, in the color temperature adjustable LED lamp or lamp group circuit in the prior art, two sets of lamp bead strings with different color temperatures, i.e., the white light lamp bead string 110 and the yellow light lamp bead string 120, are connected in parallel and respectively correspond to their own driving circuits, and the driving circuits may be provided with corresponding driving circuits according to different dimming manners, such as silicon controlled dimming, digital signal dimming, and adjustable current source; because the corresponding driving circuits are required to be respectively arranged, the driving circuits comprise the white light driving unit 130 and the warm light driving unit 140, the white light lamp bead string 110 and the yellow light lamp bead string 120 which are connected in parallel are respectively driven, the brightness of the white light lamp beads is changed, and meanwhile, the current of the yellow light lamp bead string group is changed at different rates through the warm light driving circuit, so that the brightness change proportion of the two groups of lamp beads is different, and therefore the whole LED lamp can be formed to display different color temperatures.

However, in the prior art, a single driving circuit (such as an adjustable current source) is required to be used for realizing color temperature adjustment, and independent driving circuit units of each group of lamp beads are required to be arranged, and the color temperature can be adjusted only by adjusting and controlling the current at different rates, so that not only are the driving circuit units required for each group of lamp beads, but also coordination control is required among different groups of lamp bead driving circuit units, so that the realization cost of the product is increased, the development cost and the development time are also increased, and the scheme is also complex.

Accordingly, the prior art is yet to be improved and developed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a LED lamp circuit arrangement of adjustable colour temperature to the higher condition of a plurality of drive circuit unit costs of needs of prior art, realizes the adjustable colour temperature circuit implementation scheme that drive circuit unit cost is lower.

The technical scheme of the utility model as follows:

a color temperature adjustable LED lamp circuit device comprises at least two groups of LED lamp bead groups, wherein each group is connected in series with at least one LED lamp bead, and the two groups of LED lamp bead groups adopt LED lamp beads with different color temperatures; the two groups of LED lamp bead groups are connected in series, and any selected one of the two groups of LED lamp bead groups is connected with a variable shunt circuit unit in parallel, so that the current change rates of the two groups of LED lamp beads are ensured to be different.

The LED lamp circuit device capable of adjusting the color temperature is characterized in that the variable shunt circuit unit is realized by an N-type field effect transistor, a source electrode and a drain electrode of the N-type field effect transistor are respectively connected to two ends of the selected group of lamp bead groups, and a grid electrode of the N-type field effect transistor is connected to two ends of the two groups of lamp bead groups through a divider resistor circuit.

The LED lamp circuit device capable of adjusting the color temperature is characterized in that a voltage-stabilizing diode is connected in parallel to the voltage-dividing resistor circuit, and the cathode end of the voltage-stabilizing diode is connected to the anode ends of the two groups of LED lamp bead groups through a third load resistor.

The LED lamp circuit device capable of adjusting the color temperature is characterized in that a voltage stabilizing diode is connected in parallel to the voltage dividing resistor circuit, and the cathode end of the voltage stabilizing diode is connected between the two groups of LED lamp bead groups through a third load resistor and is electrically connected with the drain electrode of the N-type field effect transistor.

The LED lamp circuit device capable of adjusting the color temperature is characterized in that load resistors are respectively connected between the grid electrode of the N-type field effect transistor and the anode and the cathode of the voltage stabilizing diode, and each load resistor comprises a fourth load circuit connected with the cathode and a fifth load resistor connected with the anode.

The LED lamp circuit device capable of adjusting the color temperature is characterized in that load resistors are respectively connected between the negative electrodes of the two groups of LED lamp bead groups and the positive electrode of the voltage stabilizing diode and the source electrode of the N-type field effect transistor, and each load resistor comprises a first load resistor connected with the positive electrode of the voltage stabilizing diode and a second load resistor connected with the source electrode.

The LED lamp circuit device capable of adjusting the color temperature is characterized in that the LED lamp beads on the two groups of LED lamp bead groups are arranged in the same number with the same specification.

The utility model provides a LED lamp circuit arrangement of adjustable colour temperature, because the LED lamp pearl group that has adopted two sets of different colour temperatures carries out series connection's mode to through at one of them a set of LED lamp pearl group go up a variable shunt circuit unit of parallel connection, thereby realize the different proportions of the electric current change of two sets of LED lamp group, thereby need not organize the outfit of carrying out the drive circuit unit to every LED lamp pearl, thereby realize that the circuit is simpler, control is easier, and development cost is lower.

Drawings

Fig. 1 is a schematic diagram of a circuit connection structure capable of adjusting color temperature in the prior art.

Fig. 2 is a schematic diagram of a schematic scheme of the color temperature adjustable LED lamp circuit device of the present invention.

Fig. 3 is a schematic diagram of the circuit device of the LED lamp of the present invention.

Fig. 4 is a schematic diagram of the first preferred embodiment of the color temperature adjustable LED lamp circuit device of the present invention.

Fig. 5 is a schematic diagram of a second preferred embodiment of the color temperature adjustable LED lamp circuit device of the present invention.

Fig. 6 is a schematic diagram of a specific principle of the color temperature adjustable LED lamp circuit device of the present invention.

Detailed Description

The following describes in detail preferred embodiments of the present invention.

The utility model discloses a LED lamp circuit arrangement of adjustable colour temperature, its preferred embodiment is shown in fig. 2, and it includes at least two sets of LED lamp pearl group, for the description conveniently establish to first set of LED lamp pearl group 210 and second group LED lamp pearl group 220, and at least one LED lamp pearl is concatenated respectively to every group, and LED lamp pearl specifically is emitting diode, and consequently every group LED lamp pearl group all carries out series connection according to the homopolar direction by one or more LED lamp pearl in proper order. And two sets of LED lamp pearl group adopt the LED lamp pearl of different colour temperatures, two sets of LED lamp pearl group series connection, first group and second group LED lamp pearl group also carry out series connection according to same polarity direction promptly. In any selected group of LED lamp bead groups, specifically in the preferred embodiment, a variable shunt circuit unit 230 is connected in parallel to the second group of LED lamp bead group 220, and the variable shunt circuit unit 230 can be used to ensure and implement the difference in the current change rate of the two groups of LED lamp beads, so that the current change between the two groups of LED lamp bead groups is asynchronous, thereby implementing the current different proportion adjustment of the two groups of LED lamp bead groups with different color temperatures.

The key point of the invention is that the LED lamp bead groups are connected in series and the variable shunt circuit is connected in parallel to achieve the purpose, and the variable shunt circuit can be freely connected to any group or any position of the LED lamp beads as long as the shunt purpose is achieved. In different embodiments of the invention, the number and specification of each group of LED lamp bead groups can be different, and different combination modes can be designed according to different specific effect requirements.

The utility model discloses the series connection of circuit through first group and second group LED lamp pearl group just can adopt a drive circuit unit to drive first group and second group LED lamp pearl group, and passes through variable shunt circuit unit 230's differentiation current control realizes realizing different current change rate control on two sets of lamp pearl groups to realize the different changes of colour temperature luminance, finally realize the adjustable controllable to the colour temperature.

As shown in fig. 2 and fig. 3, in two preferred embodiments of the LED lamp circuit device with adjustable color temperature, the variable shunt circuit unit 230 can be implemented by an N-type field effect transistor circuit, wherein the source and the drain of the N-type field effect transistor Q1 that adopts are respectively connected to the two ends of the second group of lamp bead sets (any one group of LED lamp bead sets can be selected), and the grid thereof is connected to the two ends of the two groups of lamp bead sets after passing through the divider resistor, that is, the two ends of the whole series circuit. As shown in fig. 3, the module a is an electronic switching circuit, which may be a transistor, a field effect transistor, a BJT (bipolar transistor) or other electronic components and switching circuits. The simplest function of the variable shunt circuit unit is to realize shunt by using the resistance circuit control module A.

Although the basic purpose of the present invention can be realized by the simple circuit shown in fig. 3, the shunt stability is not high, and as shown in fig. 6, the present invention has the advantages of increasing the module B of the voltage stabilizing circuit, adding the voltage stabilizing circuit in the resistor circuit of the voltage divider, improving the shunt stability, and better visual effect when changing the color temperature. The simplest implementation of the voltage stabilizing circuit is a zener diode, and certainly, other voltage stabilizing components and voltage stabilizing circuits are also possible, and the present invention is described in the preferred embodiment with a zener diode.

As shown in fig. 4 and 5, a zener diode circuit is connected in parallel to the voltage dividing resistor circuit of the gate of the N-type fet. The function of stable change of current can be realized through the circuit cooperation of the N-type field effect transistor Q1 and the voltage stabilizing diode D1.

It should be understood that, in the preferred embodiment of the present invention, the variable shunt circuit unit is not limited to be implemented by using N-type field effect transistor, any other electronic switch such as P-type field effect transistor or BJT or IGBT can also achieve the purpose of variable shunt, and its corresponding circuit implementation can be referred to the preferred embodiments of the present invention, and it is an implementation scheme that can be known to those skilled in the art without creative work.

Specifically, the negative terminal of the zener diode circuit D1 may be connected to the positive terminal of the first group of LED lamp bead groups 210 through a third load resistor R3, i.e., the terminal far away from the terminal connected to the second group of LED lamp bead groups 220, as shown in fig. 3. Or, the negative terminal of the zener diode circuit D1 is connected to the positive terminal of the second group of LED lamp bead groups 220, that is, the terminal connected to the first group of LED lamp bead groups 210, through the third load resistor R3, and is electrically connected to the drain of the N-type field effect transistor Q1.

In the preferred embodiment of the color temperature adjustable LED lamp circuit device, the gate of the N-type fet Q1 and the positive and negative poles of the zener diode D1 are connected with load resistors, namely, the fourth load circuit R4 of the negative pole and the fifth load resistor R5 of the positive pole are connected, the zener diode circuit includes the zener diode D1 and the fourth load resistor R4 and the fifth load resistor R5.

And load resistors, namely a first load resistor R1 connected with the anode of the voltage stabilizing diode and a second load resistor R2 connected with the source electrode, are respectively connected between the cathode of the second group of LED lamp bead groups 220 and the anode of the voltage stabilizing diode D1 and between the cathode of the second group of LED lamp bead groups and the source electrode of the N-type field effect transistor Q1. In the circuit, first group LED lamp pearl group with LED lamp pearl on the second group LED lamp pearl group adopts the same quantity of the same specification and sets up, and the circuit of symmetry conveniently sets up the processing with function control like this. Meanwhile, the quantity and proportion of the lamp beads of the two LED lamp bead groups can be changed according to actual product requirements, so that the LED lamp bead groups are suitable for requirements of different purposes.

The utility model discloses the theory of operation of circuit is through the LED lamp pearl group of two sets of different colour temperatures to the drive circuit unit is connected to the mode of establishing ties, like adjustable current source, and wherein a set of LED lamp pearl group link variable shunt circuit, for example connect on second group LED lamp pearl group 220 in this preferred embodiment. When the current flowing through the first group and the second group of LED lamp bead groups is changed, the resistance value of the variable shunt circuit is also changed, so that the current flowing through the variable shunt circuit is changed, the current flowing through the second group of LED lamp bead groups 220 is also different from the current flowing through the first group of LED lamp bead groups 210, the brightness change proportion of the two groups of lamp bead groups can be changed differently, and the color temperature can be adjusted.

Common drive circuit in the existing market generally has "low voltage protection mode" (Under voltage protection) function, carries out the current distribution on lamp pearl series structure and can lead to LED voltage too low easily to lead to drive circuit to get into low voltage protection mode or other abnormal work modes, Under this condition, whole LED lamp product can appear twinkling or other unusual and unstable phenomenon.

To solve the above difficulties, the variable shunt circuit needs to satisfy the following conditions: on one hand, when the main driving current is changed, the variable shunt circuit needs to automatically adjust the current flow to shunt, so that the effect of changing the color temperature is achieved; on the other hand, when LED lamp pearl luminance was shaded, driving current and voltage can reduce, when voltage drop to be close drive circuit low-voltage protection mode (or other abnormal work mode), variable shunt circuit need adjust the electric current by oneself in order to prevent that drive circuit from getting into the protection mode.

In the above circuit of the present invention, the difference between the two preferred embodiments is that the negative pole of zener diode D1 passes through the positive pole (also the positive terminal of the first group of LED lamp bead group) that third load resistance R3 is the direct connection drive circuit unit is still connected to on the tie point between the first group of LED lamp bead group and the second group of LED lamp bead group. After passing through the third load resistor R3, the driving circuit unit provides power to the zener diode D1 to establish a stable voltage. The fourth load resistor and the fifth load resistor provide a Vgs voltage (i.e., a gate-to-source voltage) to the N-type fet Q1.

When the driving current is the largest, the brightness of the two groups of LED lamp bead groups is the largest, the voltage difference between two ends of the first load resistor R1 is the highest, so that the effective Vgs voltage of the N-type field effect transistor Q1 is the lowest, the N-type field effect transistor Q1 is closed, no current is shunted, the currents of the first group of LED lamp bead group 210 and the second group of LED lamp bead group 220 are the same, and the color temperature is fixed and unchanged.

When the brightness of the whole LED lamp is reduced, the driving current is reduced, the voltage difference on the first load resistor is reduced, and the effective Vgs voltage of the N-type field effect tube Q1 is increased, so that the N-type field effect tube Q1 is turned on, and the current flowing through the second group of LED lamp bead groups 220 is shunted to the N-type field effect tube Q1, therefore, the current flowing through the two groups of lamp bead groups is reduced at different rates, the brightness of the first group of LED lamp bead groups 210 and the brightness of the second group of LED lamp bead groups 220 are reduced at different rates, and the brightness ratio of the two groups of lamp bead groups is changed accordingly, so that the color temperature is changed. And vice versa for maximum current.

When the driving current is further changed, the effective Vgs voltage of the N-type fet Q1 changes, and the current of the second group of LED lamp bead set 220 also changes at a different rate than the first group of LED lamp bead set 210, so as to finally realize color temperature adjustment.

When the brightness of the whole LED lamp bead continues to be dimmed, the driving current continues to be reduced, the voltage of the positive electrode and the negative electrode of the driving circuit is reduced, the effective Vgs voltage provided by the third load resistor is also reduced, the current flowing through the N-type field effect transistor Q1 is also reduced, even the Q1 is turned off, and the shunting is stopped. Therefore, the driving circuit can be prevented from entering a low-voltage protection mode so as to keep the normal operation and stability of the LED lamp bead.

The utility model discloses an among the above-mentioned technical implementation scheme, through the series connection mode that two sets of LED lamp pearl were organized, the technical difficulty of establishing ties has been solved to the variable shunt circuit unit of cooperation to can adopt single LED drive circuit unit, for example adjustable current source, greatly reduced development time and cost. Compared with the parallel connection scheme in the prior art, the series connection scheme can use less lamp beads, the driving circuit of the product is simpler to realize, the required parts are less, the production process is easier, and the production cost is reduced.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.

Claims

1. A color temperature adjustable LED lamp circuit device comprises at least two groups of LED lamp bead groups, wherein each group is connected in series with at least one LED lamp bead, and the two groups of LED lamp bead groups adopt LED lamp beads with different color temperatures; the LED lamp bead set is characterized in that the two groups of LED lamp bead sets are connected in series, and a variable shunt circuit unit is connected in parallel to any selected one of the two groups of LED lamp bead sets and used for ensuring that the current change rates flowing through the two groups of LED lamp beads are different.

2. The LED lamp circuit device capable of adjusting the color temperature according to claim 1, wherein the variable shunt circuit unit is implemented by an N-type field effect transistor, a source electrode and a drain electrode of the N-type field effect transistor are respectively connected to two ends of the selected group of LED lamp bead groups, and a grid electrode of the N-type field effect transistor is connected to two ends of the two groups of LED lamp bead groups through a voltage dividing resistor circuit.

3. The LED lamp circuit device with the adjustable color temperature according to claim 2, wherein a voltage regulator diode is connected in parallel to the voltage dividing resistor circuit, and a negative terminal of the voltage regulator diode is connected to positive terminals of the two groups of LED lamp beads through a third load resistor.

4. The color temperature adjustable LED lamp circuit device according to claim 2, wherein a voltage regulator diode is connected in parallel to the voltage divider resistor circuit, and a negative terminal of the voltage regulator diode is connected to a positive terminal of the second group of LED lamp bead groups, i.e. one terminal connected to the first group of LED lamp bead groups, through a third load resistor, and is electrically connected to a drain of the N-type field effect transistor.

5. The color temperature adjustable LED lamp circuit device according to claim 3 or 4, wherein load resistors are respectively connected between the grid of the N-type field effect transistor and the positive electrode and the negative electrode of the voltage regulator diode, and the load resistors comprise a fourth load circuit connected with the negative electrode and a fifth load circuit connected with the positive electrode.

6. The LED lamp circuit device capable of adjusting the color temperature according to claim 5, wherein load resistors are respectively connected between the negative electrodes of the two groups of LED lamp bead groups and the positive electrode of the voltage regulator diode and the source electrode of the N-type field effect transistor, and the load resistors comprise a first load resistor connected with the positive electrode of the voltage regulator diode and a second load resistor connected with the source electrode.

7. The color temperature adjustable LED lamp circuit device according to claim 6, wherein the LED lamp beads in the two LED lamp bead groups are arranged in the same number with the same specification.