High-precision LED color modulation power supply
By switching the circuit structure connected to the chip and the temperature sensor, and freely switching the constant current chip state, the problems of working point drift and life reduction caused by high heat in the LED color-to-tuning driving power supply are solved, and high-precision color-to-tuning control is achieved.
Patent Information
- Application Number
- CN202422427571.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-09
AI Technical Summary
The existing LED color-to-tune driving power supply generates high heat when high-power LEDs continue to operate, resulting in problems such as working point drift and reduced equipment life.
The switching chip is connected to the temperature sensor. By switching the on-off states of switch S1 and switch S2, the working state of the two constant current chips can be freely switched to avoid overheating of a single chip, and dimming and color tuning is controlled separately through two PWM signals.
The overheating state of the power chip in high-frequency PWM situation is improved, the optimal working point drift and life reduction are avoided, the color toning accuracy is improved, and the color shift is avoided.
Smart Images
Figure CN223219244U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of lighting, and in particular relates to a high-precision LED color adjustment power supply. Background Art
[0002] LED stands for Light Emitting Diode. It is a solid-state electronic device that converts electrical energy directly into light. LEDs generate light through the recombination of electrons and holes in semiconductor materials. Compared to traditional light sources such as incandescent and fluorescent lamps, LEDs offer higher energy efficiency, longer lifespans, and faster switching speeds.
[0003] With technological advancements and the continuous expansion of applications, LEDs have become a mainstream lighting technology, gradually replacing traditional light sources and becoming the preferred choice in various applications. LEDs are widely used in lighting, display, and indicator applications. In lighting, the color temperature of LED lights often needs to be adjusted according to actual conditions and usage requirements.
[0004] Existing LED color-adjusting driver power supplies generally perform color adjustment based on PWM signals. However, when high-power LEDs are continuously running, their driver chips generate high heat, causing the operating point of normal semiconductor components to drift and shortening the life of the equipment. Therefore, improvements are needed. Utility Model Content
[0005] The purpose of the embodiments of the present application is to provide a high-precision LED color adjustment power supply, aiming to solve the problem that the color adjustment performed by the existing LED color adjustment driver power supply is generally based on PWM signals. However, when high-power LEDs are continuously running, their driver chips will generate high heat, causing the operating point of normal semiconductor components to drift and shortening the life of the equipment.
[0006] The embodiment of the present application is implemented by providing a high-precision LED color adjustment power supply, wherein the color adjustment power supply is used to power an LED, including:
[0007] Switching chip P3, first constant current chip P1, second constant current chip P2, transistor Q1, transistor Q2, transistor Q3, diode D1, diode D2, diode D3, resistor R1, resistor R2, resistor R3, switch S1 and switch S2;
[0008] The temperature signal input terminal of the switching chip P3 is used to connect to the temperature sensor for measuring the temperature of the device body. The switching chip P3 is also provided with a switch switching signal output terminal for switching the on / off state of the switch S1 and the switch S2 based on the signal input by the temperature sensor. The first end of the switch S1 and the first end of the switch S2 are both connected to the positive electrode of the power supply, the second end of the switch S1 is connected to the VCC input terminal of the first constant current chip P1, and the second end of the switch S2 is connected to the VCC input terminal of the second constant current chip P2. The PWM input terminal of the first constant current chip P1 and the PWM input terminal of the second constant current chip P2 are both used to input the first PWM input signal. The negative voltage output terminal of the first constant current chip P1 and the negative voltage output terminal of the second constant current chip P2 are interconnected with the source of the transistor Q2, and the drain of the transistor Q2 is connected to the VCC input terminal of the first constant current chip P1. The cathode of the diode D1 is connected, the gate of the transistor Q2 is connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the anode of the diode D1, the gate of the transistor Q2 is also connected to the collector of the transistor Q3, the base of the transistor Q3 is used to be connected to the second PWM signal input end, the emitter of the transistor Q3 is grounded, the second end of the resistor R2 is also interconnected with the first end of the resistor R1, the positive electrode of the power supply and the positive electrode of the diode D2, the cathode of the transistor D1 and the negative electrode of the transistor D3 are connected to each other, the second end of the resistor R1, the first end of the resistor R3, the anode of the diode D3 and the gate of the transistor Q1 are connected to each other, the source of the transistor Q3 and the second end of the resistor R3 are interconnected with the negative voltage output end of the first constant current chip P1, and the drain of the transistor Q1 is connected to the negative electrode of the diode D2.
[0009] Preferably, the switch S1 and the switch S2 are on-off switches whose on-and-off states are mutually exclusive.
[0010] Preferably, the switching chip P3 is further connected to a clock circuit, for obtaining a clock signal from the clock circuit connection and switching the on and off states of the switches S1 and S2 based on a fixed time interval.
[0011] Preferably, the transistor Q1 and the transistor Q2 are MOS transistors.
[0012] Preferably, the transistor Q3 is an NPN transistor.
[0013] Preferably, the diode D1 and the diode D2 are both light emitting diodes.
[0014] The high-precision LED color-adjusting power supply provided by the present application has the following advantages: A switching module enables the free switching of the operating states of the two constant-source chips, improving the overheating of the power supply chip, which is prone to occur under high-frequency PWM conditions, and preventing the optimal operating point drift or life reduction caused by long-term operation of a single chip. Furthermore, the two PWM signals can independently control dimming and color adjustment, preventing color shift during dimming and achieving higher color adjustment accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 A circuit diagram of a high-precision LED color adjustment power supply provided in an embodiment of the present application. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0017] As used herein, "coupled" or "connected" may refer to direct or indirect physical or electrical contact between two or more components, or to the mutual operation or action of two or more components. The term "circuit" generally refers to an object composed of one or more transistors and / or one or more active and passive components connected in a specific manner to process signals.
[0018] However, those skilled in the art will appreciate that the same component may be referred to by different names. This application does not distinguish components by name, but rather by their functional differences.
[0019] In addition, the embodiments of the present application cover the features of multiple specific embodiments and the method steps and their sequences for constructing and operating these specific embodiments. However, other specific embodiments may also be used to achieve the same or equivalent functions and step sequences. Unless otherwise defined in this specification, the scientific and technical terms used herein have the same meanings as those understood and used by those skilled in the art to which this application belongs. In addition, when not inconsistent with the context, singular nouns used in this specification include the plural form of the noun; and plural nouns used also include the singular form of the noun.
[0020] The specific implementation of this application is described in detail below in conjunction with specific embodiments.
[0021] like Figure 1 FIG. 1 is a circuit diagram of a high-precision LED color adjustment power supply provided in an embodiment of the present application. The color adjustment power supply can be used to power an LED, including:
[0022] Switching chip P3, first constant current chip P1, second constant current chip P2, transistor Q1, transistor Q2, transistor Q3, diode D1, diode D2, diode D3, resistor R1, resistor R2, resistor R3, switch S1 and switch S2;
[0023] The temperature signal input terminal of the switching chip P3 is used to connect to the temperature sensor for measuring the temperature of the device body. The switching chip P3 is also provided with a switch switching signal output terminal for switching the on / off state of the switch S1 and the switch S2 based on the signal input by the temperature sensor. The first end of the switch S1 and the first end of the switch S2 are both connected to the positive electrode of the power supply, the second end of the switch S1 is connected to the VCC input terminal of the first constant current chip P1, and the second end of the switch S2 is connected to the VCC input terminal of the second constant current chip P2. The PWM input terminal of the first constant current chip P1 and the PWM input terminal of the second constant current chip P2 are both used to input the first PWM input signal. The negative voltage output terminal of the first constant current chip P1 and the negative voltage output terminal of the second constant current chip P2 are interconnected with the source of the transistor Q2, and the drain of the transistor Q2 is connected to the VCC input terminal of the first constant current chip P1. The cathode of the diode D1 is connected, the gate of the transistor Q2 is connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the anode of the diode D1, the gate of the transistor Q2 is also connected to the collector of the transistor Q3, the base of the transistor Q3 is used to be connected to the second PWM signal input end, the emitter of the transistor Q3 is grounded, the second end of the resistor R2 is also interconnected with the first end of the resistor R1, the positive electrode of the power supply and the positive electrode of the diode D2, the cathode of the transistor D1 and the negative electrode of the transistor D3 are connected to each other, the second end of the resistor R1, the first end of the resistor R3, the anode of the diode D3 and the gate of the transistor Q1 are connected to each other, the source of the transistor Q3 and the second end of the resistor R3 are interconnected with the negative voltage output end of the first constant current chip P1, and the drain of the transistor Q1 is connected to the negative electrode of the diode D2.
[0024] In the embodiments of this application, Figure 1 As shown, the first PWM input signal input from Port2 can be independent of the second PWM input signal from Port4, and the two diodes D1 and D2 can be a light-emitting module formed by one or more light-emitting diodes with different color temperatures. The brightness of the LED changes with the change of the on-off time. If the two LEDs have different light-emitting times, differential adjustment of brightness and color temperature can occur. Port Port1 can be used to input a positive voltage VCC. Port Port3 can be used to input a temperature signal from a temperature sensor, which can be used to sense the temperature of the constant current chip provided by the device, and control the two light-emitting chips to work intermittently when the overall or local temperature of the device is too high. For example, control switch S1 and switch S2 to be closed at the same time, and for another example, control only one of switch S1 and switch S2 to be in the on state, thereby reducing the temperature of one of the constant current chips.
[0025] The embodiment of the present application may further include a calculation unit for obtaining the duty cycle of the two PWM signals according to the requirements to control the dimming and color adjustment respectively. Figure 1As shown, the second PWM signal is at a low level. At this time, the transistor Q3 is not turned on, the light-emitting diode D2 is not on, and the light-emitting diode D1 is on; when the second PWM signal is at a high level, it is used for dimming. At this time, the transistor Q3 is turned on, the light-emitting diode D2 is on, and the light-emitting diode D1 is not on.
[0026] Those skilled in the art will recognize that the color temperature and brightness of LED lights often require rapid adjustment and change based on actual conditions and usage requirements. Existing LED color-adjusting driver power supplies typically perform color adjustment based on PWM signals. However, for high-power LEDs, continuous operation can generate significant heat in the driver chip.
[0027] Especially in PWM control, constant current chips need to frequently switch between on and off states, which generates switching losses. High load currents or high operating frequencies can increase internal chip power dissipation, leading to overheating. Alternatively, high ambient temperatures and poor heat dissipation can lead to heat accumulation in the chip, causing overheating. These factors can cause the operating point of normal semiconductor components to drift, shortening the life of the device.
[0028] The advantages of this application's circuit structure are that, through the switching module, the operating states of the two constant-source chips can be freely switched, improving the overheating of the power supply chip, which is prone to occur under high-frequency PWM conditions, and preventing the optimal operating point drift or life reduction caused by long-term operation of a single chip. Furthermore, the two PWM signals can independently control dimming and color adjustment, avoiding color shift during dimming and achieving higher color adjustment accuracy.
[0029] As a preferred embodiment of the present application, the switch S1 and the switch S2 are on-off switches with mutually exclusive on and off states.
[0030] In the embodiment of the present application, only one of the switches S1 and S2 is in the on state to prevent the two power supply chips from operating simultaneously and causing damage due to overvoltage in the circuit.
[0031] As another preferred embodiment of the present application, the switching chip P3 also has a clock circuit connection for obtaining a clock signal from the clock circuit connection and switching the on and off states of the switches S1 and S2 based on a fixed time interval.
[0032] In an embodiment of the present application, the switching chip P3 can also obtain a clock signal, for example, a high and low level pulse signal, and can use pulse counting and other methods to switch the state of the switch S1 and the switch S2 after counting a certain number of fixed cycles or time.
[0033] As another preferred embodiment of the present application, the transistor Q1 and the transistor Q2 are MOS transistors.
[0034] In the embodiments of the present application, both transistors Q1 and Q2 can be NMOS transistors. The advantage of NMOS transistors is that they have virtually no leakage current, only leaking when operating, resulting in very low power consumption in standby mode. Furthermore, their relatively low on-resistance allows for a high current output. Furthermore, due to their fast response and high switching speed, NMOS transistors are suitable for high-frequency applications, and their performance stability is even better at high temperatures.
[0035] As another preferred embodiment of the present application, the transistor Q3 is an NPN transistor.
[0036] As another preferred embodiment of the present application, the diode D1 and the diode D2 are both light emitting diodes, and their color temperatures are different. In this case, dimming and color adjustment control can be performed by changing the duty cycle of the two PWM signals.
[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A high-precision LED color adjustment power supply, characterized in that: The color adjustment power supply is used to power the LED, including: Switching chip P3, first constant current chip P1, second constant current chip P2, transistor Q1, transistor Q2, transistor Q3, diode D1, diode D2, diode D3, resistor R1, resistor R2, resistor R3, switch S1 and switch S2; The temperature signal input terminal of the switching chip P3 is used to connect to the temperature sensor for measuring the temperature of the device body. The switching chip P3 is also provided with a switch switching signal output terminal for switching the on / off state of the switch S1 and the switch S2 based on the signal input by the temperature sensor. The first end of the switch S1 and the first end of the switch S2 are both connected to the positive electrode of the power supply, the second end of the switch S1 is connected to the VCC input terminal of the first constant current chip P1, and the second end of the switch S2 is connected to the VCC input terminal of the second constant current chip P2. The PWM input terminal of the first constant current chip P1 and the PWM input terminal of the second constant current chip P2 are both used to input the first PWM input signal. The negative voltage output terminal of the first constant current chip P1 and the negative voltage output terminal of the second constant current chip P2 are interconnected with the source of the transistor Q2, and the drain of the transistor Q2 is connected to the VCC input terminal of the first constant current chip P1. The cathode of the diode D1 is connected, the gate of the transistor Q2 is connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the anode of the diode D1, the gate of the transistor Q2 is also connected to the collector of the transistor Q3, the base of the transistor Q3 is used to be connected to the second PWM signal input end, the emitter of the transistor Q3 is grounded, the second end of the resistor R2 is also interconnected with the first end of the resistor R1, the positive electrode of the power supply and the positive electrode of the diode D2, the cathode of the transistor D1 and the negative electrode of the transistor D3 are connected to each other, the second end of the resistor R1, the first end of the resistor R3, the anode of the diode D3 and the gate of the transistor Q1 are connected to each other, the source of the transistor Q3 and the second end of the resistor R3 are interconnected with the negative voltage output end of the first constant current chip P1, and the drain of the transistor Q1 is connected to the negative electrode of the diode D2.
2. The high-precision LED color adjustment power supply according to claim 1, characterized in that: The switch S1 and the switch S2 are on-off switches whose on-off states are mutually exclusive.
3. The high-precision LED color adjustment power supply according to claim 1, characterized in that: The switching chip P3 is also connected to a clock circuit, for obtaining a clock signal from the clock circuit connection and switching the on and off states of the switches S1 and S2 based on a fixed time interval.
4. The high-precision LED color adjustment power supply according to claim 1, characterized in that: The transistor Q1 and the transistor Q2 are MOS transistors.
5. The high-precision LED color adjustment power supply according to claim 1, characterized in that: The transistor Q3 is an NPN transistor.
6. The high-precision LED color adjustment power supply according to claim 1, characterized in that: The diode D1 and the diode D2 are both light emitting diodes.