Constant-power constant-voltage multi-color-temperature control circuit and dimming lighting lamp

Abstract

The utility model provides a constant-power constant-voltage multi-color-temperature control circuit and a dimming illuminating lamp, the constant-power constant-voltage multi-color-temperature control circuit comprises a first current adjusting resistor, a second current adjusting resistor, a third current adjusting resistor, a cold light source and a warm light source, the cold light source is connected with the first current adjusting resistor and the second current adjusting resistor respectively, and the warm light source is connected with the first current adjusting resistor. The warm light source is connected with the first and third current adjusting resistors. According to the circuit, by adjusting the resistance values of the three current adjusting resistors, constant power output is kept when one or more light sources are connected, and the problem that heat is increased due to the fact that the output power is doubled when multiple light sources are connected at the same time in a traditional constant-voltage color temperature adjusting lamp is solved. The circuit can realize multi-color-temperature constant-power output by using the existing power supply, so that the applicability of the circuit is improved. The circuit can also be applied to multi-channel color temperature adjustment of RGBCW and the like, so that the constant-power constant-voltage multi-color-temperature control circuit can meet more dimming design schemes.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of lighting lamps, in particular to a constant-power constant-voltage multi-color-temperature control circuit and a dimming lighting lamp. BACKGROUND

[0002] In the prior art, constant-voltage color adjusting products generally have the following problems: when cold light and warm light are connected at the same time, the power will be doubled, causing the product to be difficult to withstand the heat generated thereby. In order to solve this problem, a software algorithm of dimming driving is usually used to distribute the dimming PWM duty cycle, so as to realize constant-power output when two groups of light sources are connected at the same time. However, this method relies on complex software algorithm control, not only increasing the cost of the product, but also possibly affecting the stability and reliability of the system.

[0003] For example, the comparative document CN202120519624.X discloses a constant-power LED dimming circuit, which comprises: a first light-emitting circuit; a second light-emitting circuit connected in parallel with the first light-emitting circuit; a first switch connected in series with the first light-emitting circuit; a second switch connected in series with the second light-emitting circuit; a control signal output end connected to the control end of the first switch; and an inverter circuit connected between the control signal output end and the control end of the second control switch. This scheme controls the on-time of two groups of LED modules through a group of control signals and their inverse signals. When the on-time of one group of LED modules increases, the on-time of the other group of LED modules decreases accordingly, so that the total power of the two groups of LED modules remains unchanged, i.e. it is realized by adjusting the duty cycle of the control signal, the change of the duty cycle leads to the change of the LED light-emitting time, and then the color temperature adjustment is realized while the total power is kept constant. However, this scheme has a complex structure and needs a group of control signals to adjust the color temperature of two groups of LED modules, resulting in a lack of flexibility of the circuit and a relatively limited application range. UTILITY MODEL CONTENT

[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a constant-power constant-voltage multi-color-temperature control circuit and a dimming lighting lamp.

[0005] The purpose of the present disclosure is achieved by the following technical solutions:

[0006] A constant power constant voltage multi-color temperature control circuit, comprising a first current regulating resistor, a second current regulating resistor, a third current regulating resistor, a cool light source and a warm light source, a first end of the first current regulating resistor is used for being connected with a positive pole of a constant voltage power supply, a second end of the first current regulating resistor is connected with a positive pole of the cool light source and a positive pole of the warm light source respectively, a negative pole of the cool light source is connected with a first end of the second current regulating resistor, a second end of the second current regulating resistor is connected with a first output end, a negative pole of the warm light source is connected with a first end of the third current regulating resistor, and a second end of the third current regulating resistor is connected with a second output end.

[0007] In one of the embodiments, the first current regulating resistor is an adjustable resistor.

[0008] In one of the embodiments, the second current regulating resistor is an adjustable resistor.

[0009] In one of the embodiments, the third current regulating resistor is an adjustable resistor.

[0010] In one of the embodiments, the cool light source comprises a plurality of LED lamps arranged in series.

[0011] In one of the embodiments, the cool light source comprises a plurality of LED lamps arranged in parallel.

[0012] In one of the embodiments, the warm light source comprises a plurality of LED lamps arranged in series.

[0013] In one of the embodiments, the warm light source comprises a plurality of LED lamps arranged in parallel.

[0014] In one of the embodiments, the resistance value of the first current regulating resistor is greater than any one of the resistance value of the second current regulating resistor and the resistance value of the third current regulating resistor.

[0015] The application also provides a dimming lighting lamp, comprising the constant power constant voltage multi-color temperature control circuit of any one of the embodiments.

[0016] Compared with the prior art, the present application has at least the following advantages:

[0017] 1. The constant power constant voltage multi-color temperature control circuit, by adjusting the resistance values of the first current regulating resistor, the second current regulating resistor and the third current regulating resistor, the constant power constant voltage multi-color temperature control circuit keeps constant power output when a single or multiple light sources are connected, thereby avoiding the problem that the output power of the traditional constant voltage color temperature lamp is doubled when multiple light sources are connected at the same time, and the heat generated by the lamp is increased.

[0018] 2. The constant power constant voltage multi-color temperature control circuit can be compatible with the function of the traditional constant voltage color temperature adjusting lamp, and can also be connected to an ordinary power supply to realize constant power output of different color temperatures, thereby improving the applicability and flexibility of the constant power constant voltage multi-color temperature control circuit.

[0019] 3. In another aspect, the cold light source and the warm light source in the constant power constant voltage multi-color temperature control circuit can be extended to multi-channel color temperature adjustment applications such as RGB CW, so that the constant power constant voltage multi-color temperature control circuit can meet more dimming design schemes. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0021] Figure 1 The circuit diagram of the constant power constant voltage multi-color temperature control circuit of an embodiment. DETAILED DESCRIPTION

[0022] In order to facilitate understanding of the present disclosure, the present disclosure will be described more fully below with reference to the related drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terminology used in the description of the present disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure will be further described in detail below in combination with specific embodiments:

[0026] As Figure 1 shown in the figure, the constant power constant voltage multi-color temperature control circuit 10 of an embodiment of the present disclosure includes a first current regulating resistor R1, a second current regulating resistor R2, a third current regulating resistor R3, a cool light source LED1 and a warm light source LED2. The first end of the first current regulating resistor R1 is used to connect with the positive pole Vin+ of the constant voltage power supply. The second end of the first current regulating resistor R1 is connected with the positive pole of the cool light source LED1 and the positive pole of the warm light source LED2 respectively. The negative pole of the cool light source LED1 is connected with the first end of the second current regulating resistor R2. The second end of the second current regulating resistor R2 is connected with the first output end C-. The negative pole of the warm light source LED2 is connected with the first end of the third current regulating resistor R3. The second end of the third current regulating resistor R3 is connected with the second output end W-.

[0027] In the embodiment, the current flows into the first current regulating resistor R1 from the positive pole Vin+ of the constant voltage power supply, is divided and limited by the first current regulating resistor R1, and then flows into the cool light source LED1 and the warm light source LED2 from the first current regulating resistor R1 respectively. When the negative pole of the constant voltage power supply is connected with the first output end C-, the current flows through the first current regulating resistor R1 and the cool light source LED1 and conducts to the second current regulating resistor R2, and then forms a first current loop through the second current regulating resistor R2 and the first output end C-, and at the same time, the cool light source LED1 works normally. At this time, the output power of the first current loop is the first output power P1, which is equal to the difference between the input voltage of the constant voltage power supply and the forward voltage drop VF LED1 of the cool light source LED1 in value, divided by the sum of the resistance values of the first current regulating resistor R1 and the second current regulating resistor R2, and then multiplied by the input voltage of the constant voltage power supply, that is, P1=[(V in+ -VF LED1 ) / (R1+R2)]*V in+ , and the resistance value of the second current regulating resistor R2 is much smaller than that of the first current regulating resistor R1.

[0028] When the negative pole of the constant voltage power supply is connected with the second output end W-, the current flows through the first current regulating resistor R1 and the warm light source LED2 and conducts to the third current regulating resistor R3, and then forms a second current loop through the third current regulating resistor R3 and the second output end W-, and at the same time, the warm light source LED2 works normally. At this time, the output power of the second current loop is the second output power P2, which is equal to the difference between the input voltage of the constant voltage power supply and the forward voltage drop VF LED2 of the warm light source LED2 in value, divided by the sum of the resistance values of the first current regulating resistor R1 and the third current regulating resistor R3, and then multiplied by the input voltage of the constant voltage power supply, that is, P2=[(V in+ -VFLED2 ) / (R1+R3)]*V in+ , and the resistance value of the third current regulating resistor R3 is much smaller than that of the first current regulating resistor R1.

[0029] Specifically, when the negative pole of the constant voltage power supply is connected to the first output end C- and the second output end W- at the same time, the current flows through the first current loop and the second current loop respectively, and makes the cool light source LED1 and the warm light source LED2 work normally at the same time. At this time, the first current loop and the second current loop are two current loops in parallel with each other, so that the first current loop and the second current loop play a shunt role to the current flowing into the first current regulating resistor R1. Since the resistance value of the first current regulating resistor R1 is much larger than that of the second current regulating resistor R2 and the third current regulating resistor R3, according to Ohm's law, the forward voltage drop of the second current regulating resistor R2 and the third current regulating resistor R3 is low, so that the output power of the second current regulating resistor R2 and the third current regulating resistor R3 can be ignored, resulting in that the total output power of the constant power constant voltage multi-color temperature control circuit 10 is approximately equal to the output power of the cool light source LED1 or the warm light source LED2. Thus, when the two light sources work at the same time, by adjusting the resistance values of the first current regulating resistor R1, the second current regulating resistor R2 and the third current regulating resistor R3, the total output power P3 of the entire circuit can be kept approximately equal to the output power when a single light source works, and the constant power constant voltage multi-color temperature control circuit 10 realizes constant power output.

[0030] The constant power constant voltage multi-color temperature control circuit 10 described above can keep the output power constant when a single or multiple light sources are connected, by adjusting the resistance values of the first current regulating resistor R1, the second current regulating resistor R2 and the third current regulating resistor R3, thereby avoiding the problem that the output power of the traditional constant voltage color temperature adjusting lamp doubles when multiple light sources are connected at the same time, and the heat generated by the lamp increases. The constant power constant voltage multi-color temperature control circuit 10 can be compatible with the function of the traditional constant voltage color temperature adjusting lamp, and can also be connected to an ordinary power supply to realize different color temperature constant power outputs, thereby improving the applicability and flexibility of the constant power constant voltage multi-color temperature control circuit 10. On the other hand, the cool light source LED1 and the warm light source LED2 in the constant power constant voltage multi-color temperature control circuit 10 can be expanded to multi-channel color temperature adjustment applications such as RGB CW, so that the constant power constant voltage multi-color temperature control circuit 10 can meet more light adjustment design schemes.

[0031] As Figure 1As shown in the figure, in one of the embodiments, the first current regulating resistor R1 is an adjustable resistor. In this embodiment, after the constant power constant voltage multi-color temperature control circuit 10 is connected to a constant voltage power supply, the current first flows through the first current regulating resistor R1, and then the current flows from the first current regulating resistor R1 through the cool light source LED1 and the warm light source LED2. Since the first current regulating resistor R1 is an adjustable resistor, according to Ohm's law, when the first current regulating resistor R1 increases, the current flowing through the cool light source LED1 and the warm light source LED2 will decrease; when the first current regulating resistor R1 decreases, the current flowing through the cool light source LED1 and the warm light source LED2 will increase, so that by adjusting the resistance value of the first current regulating resistor R1, the brightness of the cool light source LED1 and the warm light source LED2 can be adjusted, thereby improving the flexibility of the constant power constant voltage multi-color temperature control circuit.

[0032] As shown in the figure, Figure 1 In one of the embodiments, the second current regulating resistor R2 is an adjustable resistor. In this embodiment, since the cool light source LED1 is connected in series with the second current regulating resistor R2, and the second current regulating resistor R2 is an adjustable resistor, according to Ohm's law, when the second current regulating resistor R2 increases, the current flowing through the cool light source LED1 will decrease, and the brightness of the cool light source LED1 will decrease; when the second current regulating resistor R2 decreases, the current flowing through the cool light source LED1 will increase, and the brightness of the cool light source LED1 will increase, so that the brightness of the cool light source LED1 can be adjusted through the second current regulating resistor R2.

[0033] As shown in the figure, Figure 1 In one of the embodiments, the third current regulating resistor R3 is an adjustable resistor. In this embodiment, since the warm light source LED2 is connected in series with the third current regulating resistor R3, and the third current regulating resistor R3 is an adjustable resistor, according to Ohm's law, when the third current regulating resistor R3 increases, the current flowing through the warm light source LED2 will decrease, and the brightness of the warm light source LED2 will decrease; when the third current regulating resistor R3 decreases, the current flowing through the warm light source LED2 will increase, and the brightness of the warm light source LED2 will increase, so that the brightness of the warm light source LED2 can be adjusted through the third current regulating resistor R3.

[0034] As shown in the figure, Figure 1As shown, in one embodiment, the cold light source LED1 includes multiple LEDs arranged in series. In this embodiment, since the current flowing through each LED is equal in a series circuit, and the brightness of the series-connected LEDs may be affected by the performance of each LED in the circuit, when the performance of each LED constituting the cold light source LED1 is the same, the multiple series-connected LEDs can maintain good brightness uniformity. This allows the constant power constant voltage multicolor temperature control circuit 10 to be applied to scenarios with multiple series-connected LEDs, thereby improving the applicability of the constant power constant voltage multicolor temperature control circuit 10.

[0035] like Figure 1 As shown, in one embodiment, the cold light source LED1 includes multiple LEDs connected in parallel. In this embodiment, since each LED has the same voltage in the parallel circuit, and the current flowing through each LED can vary due to differences in the characteristics of each LED, the brightness of each LED is not affected by the other LEDs. Therefore, when there are differences in the performance of the LEDs constituting the cold light source LED1, multiple LEDs connected in parallel are better than those connected in series in terms of brightness uniformity. This allows the constant power constant voltage multicolor temperature control circuit 10 to be applied to scenarios with multiple parallel LEDs, thereby improving the applicability of the constant power constant voltage multicolor temperature control circuit 10.

[0036] like Figure 1 As shown, in one embodiment, the warm light source LED2 includes multiple LEDs arranged in series. In this embodiment, since the current flowing through each LED is equal in a series circuit, and the brightness of the series-connected LEDs may be affected by the performance of each LED in the circuit, when the performance of each LED constituting the warm light source LED2 is the same, the multiple series-connected LEDs can maintain good brightness uniformity. This allows the constant power constant voltage multicolor temperature control circuit 10 to be applied to scenarios with multiple series-connected LEDs, thereby improving the applicability of the constant power constant voltage multicolor temperature control circuit 10.

[0037] like Figure 1 As shown, in one embodiment, the warm light source LED2 includes multiple LEDs connected in parallel. In this embodiment, since each LED has the same voltage in the parallel circuit, and the current flowing through each LED can vary due to differences in the characteristics of each LED, the brightness of each LED is not affected by the other LEDs. Therefore, when there are differences in the performance of the LEDs constituting the warm light source LED2, multiple LEDs connected in parallel are better than those connected in series in terms of brightness uniformity. This allows the constant power constant voltage multicolor temperature control circuit 10 to be applied to scenarios with multiple parallel LEDs, thereby improving the applicability of the constant power constant voltage multicolor temperature control circuit 10.

[0038] like Figure 1 As shown, in one embodiment, the resistance of the first current regulating resistor R1 is greater than the resistance of either the second current regulating resistor R2 or the third current regulating resistor R3. In this embodiment, when both the cold light source LED1 and the warm light source LED2 are connected, according to Ohm's law, the current flowing through the second current regulating resistor R2 and the third current regulating resistor R3 is relatively small, making their output power negligible. Consequently, the total output power of the constant power constant voltage multicolor temperature control circuit 10 is approximately equal to the output power of either the cold light source LED1 or the warm light source LED2. Furthermore, since the second current regulating resistor R2 is connected in series with the cold light source LED1, and the third current regulating resistor R3 is connected in series with the warm light source LED2, the second current regulating resistor R2 and the third current regulating resistor R3 play a role in balancing power in the circuit, thereby enabling the constant power constant voltage multicolor temperature control circuit 10 to achieve constant power output.

[0039] This application also provides a dimming lighting fixture, including a constant power constant voltage multi-color temperature control circuit according to any embodiment. In this embodiment, current flows from the positive terminal Vin+ of the constant voltage power supply into the first current regulating resistor R1, then is divided and current limited by the first current regulating resistor R1, and then flows from the first current regulating resistor R1 into the cold light source LED1 and the warm light source LED2 respectively; when the negative terminal of the constant voltage power supply is connected to the first output terminal C-, the current flows through the first current regulating resistor R1 and the cold light source LED1 and is conducted to the second current regulating resistor R2, and then forms a first current loop through the second current regulating resistor R2 and the first output terminal C-, thereby enabling the cold light source LED1 to work normally. At this time, the output power of the first current loop is the first output power P1, which is numerically equal to the input voltage of the constant voltage power supply and the forward voltage drop VF of the cold light source LED1. LED1 The difference is divided by the sum of the resistance values ​​of the first current regulating resistor R1 and the second current regulating resistor R2, and then the quotient is multiplied by the input voltage of the constant voltage power supply, i.e., P1 = [(V in+ -VF LED1 ) / (R1+R2)]*V in+ Furthermore, the resistance value of the second current regulating resistor R2 is much smaller than that of the first current regulating resistor R1. When the negative terminal of the constant voltage power supply is connected to the second output terminal W-, the current flows through the first current regulating resistor R1 and the warm light source LED2 to the third current regulating resistor R3, and then through the third current regulating resistor R3 and the second output terminal W- to form a second current loop. This simultaneously enables the warm light source LED2 to operate normally. At this time, the output power of the second current loop is the second output power P2, which is numerically equal to the input voltage of the constant voltage power supply and the forward voltage drop VF of the warm light source LED2.LED2 the difference divided by the sum of the resistance values of the first current regulating resistor R1 and the third current regulating resistor R3, and then the resulting quotient multiplied by the input voltage of the constant voltage power supply, i.e. P2 = [(V in+ -VF LED2 ) / (R1+R3)]*V in+ , and the resistance value of the third current regulating resistor R3 is much smaller than that of the first current regulating resistor R1. Specifically, when the negative pole of the constant voltage power supply is connected to the first output end C- and the second output end W- at the same time, the current flows through the first current loop and the second current loop respectively, and makes the cool light source LED1 and the warm light source LED2 work normally at the same time. At this time, the first current loop and the second current loop are two current loops in parallel with each other, so that the first current loop and the second current loop play a shunt role to the current flowing into the first current regulating resistor R1. And because the resistance value of the first current regulating resistor R1 is much larger than that of the second current regulating resistor R2 and the third current regulating resistor R3, according to Ohm's law, the current flowing through the second current regulating resistor R2 and the third current regulating resistor R3 is small when the cool light source LED1 and the warm light source LED2 work at the same time, so that the output power of the second current regulating resistor R2 and the third current regulating resistor R3 can be ignored, resulting in that the total output power of the constant power constant voltage multi-color temperature control circuit 10 is approximately equal to the output power of the cool light source LED1 or the warm light source LED2. Thus, when the two light sources work at the same time, by adjusting the resistance values of the first current regulating resistor R1, the second current regulating resistor R2 and the third current regulating resistor R3, the total output power P3 of the entire circuit can be kept approximately equal to the output power when a single light source works, and thus the constant power constant voltage multi-color temperature control circuit 10 realizes constant power output.

[0040] Compared with the prior art, the present disclosure has at least the following advantages:

[0041] 1. The constant power constant voltage multi-color temperature control circuit 10 described above can keep the output power constant when a single or multiple light sources are connected, thereby avoiding the problem that the output power of the traditional constant voltage color temperature adjusting lamp doubles when multiple light sources are connected at the same time, and thus the heat generated by the lamp increases.

[0042] 2. The constant power constant voltage multi-color temperature control circuit 10 is compatible with the functions of the traditional constant voltage color temperature adjusting lamp, and can also be connected to an ordinary power supply to realize different color temperature constant power outputs, thereby improving the applicability and flexibility of the constant power constant voltage multi-color temperature control circuit 10.

[0043] 3. In another aspect, the cold light source LED1 and the warm light source LED2 in the constant power constant voltage multi-color temperature control circuit 10 can be extended to multi-channel color temperature adjustment applications such as RGB CW, so that the constant power constant voltage multi-color temperature control circuit 10 can meet more dimming design schemes.

[0044] The above-described embodiments only express several implementation manners of the present disclosure, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the disclosed patent. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent should be subject to the appended claims.

Claims

1. A constant power constant voltage multi-color temperature control circuit, characterized in that, The constant power constant voltage multi-color temperature control circuit comprises a first current regulating resistor, a second current regulating resistor, a third current regulating resistor, a cold light source and a warm light source, a first end of the first current regulating resistor is connected with a positive pole of a constant voltage power supply, a second end of the first current regulating resistor is connected with a positive pole of the cold light source and a positive pole of the warm light source respectively, a negative pole of the cold light source is connected with a first end of the second current regulating resistor, a second end of the second current regulating resistor is connected with a first output end, a negative pole of the warm light source is connected with a first end of the third current regulating resistor, and a second end of the third current regulating resistor is connected with a second output end.

2. The constant power constant voltage multi-color temperature control circuit according to claim 1, wherein, The first current regulating resistor is an adjustable resistor.

3. The constant power constant voltage multi-color temperature control circuit according to claim 1, wherein, The second current regulating resistor is an adjustable resistor.

4. The constant power constant voltage multi-color temperature control circuit of claim 1, wherein, The third current regulating resistor is an adjustable resistor.

5. The constant power constant voltage multi-color temperature control circuit of claim 1, wherein, The cold light source comprises a plurality of LED lamps arranged in series.

6. The constant power constant voltage multi-color temperature control circuit according to claim 5, wherein, The cold light source comprises a plurality of LED lamps arranged in parallel.

7. The constant power constant voltage multi-color temperature control circuit of claim 1, wherein, The warm light source comprises a plurality of LED lamps arranged in series.

8. The constant power constant voltage multi-color temperature control circuit according to claim 7, wherein, The warm light source comprises a plurality of LED lamps arranged in parallel.

9. The constant power constant voltage multi-color temperature control circuit of claim 1, wherein, The resistance value of the first current regulating resistor is greater than any one of the resistance value of the second current regulating resistor and the resistance value of the third current regulating resistor.

10. A dimmable lighting fixture, characterized by, The constant power constant voltage multi-color temperature control circuit comprises a first current regulating resistor, a second current regulating resistor, a third current regulating resistor, a cold light source and a warm light source, a first end of the first current regulating resistor is connected with a positive pole of a constant voltage power supply, a second end of the first current regulating resistor is connected with a positive pole of the cold light source and a positive pole of the warm light source respectively, a negative pole of the cold light source is connected with a first end of the second current regulating resistor, a second end of the second current regulating resistor is connected with a first output end, a negative pole of the warm light source is connected with a first end of the third current regulating resistor, and a second end of the third current regulating resistor is connected with a second output end.

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