Silicon controlled rectifier dimming circuit applied to three-wire lamp strip
By adding a power-off detection module and a color adjustment drive module to the thyristor dimming power supply circuit, the problem of unadjustable color temperature in the existing technology is solved, and stepless dimming and color temperature adjustment are achieved, which improves user experience and reduces costs.
Patent Information
- Application Number
- CN202422573668.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-10-23
AI Technical Summary
Existing thyristor dimming drivers can only pre-set color temperature and cannot be changed after installation, resulting in poor user experience, high costs, and a lack of stepless dimming and color temperature adjustment functions.
A power-off detection module and a color adjustment drive module are added to the existing thyristor dimming power supply circuit. The PWM signal is controlled by detecting the power-off signal to achieve W/Y/W+Y color adjustment, and the brightness is infinitely adjusted through the dimming potentiometer.
It realizes stepless dimming and color temperature adjustment, has a simple structure, saves costs and improves user experience.
Smart Images
Figure CN223415052U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of LED dimming, in particular to a thyristor dimming circuit applied to a three-wire light strip. Background Art
[0002] Thyristor dimming is currently the most widely used dimming method for LEDs. Thyristor dimming is a physical dimming method. Starting at AC phase 0, the input voltage is chopped until the thyristor conducts, and then voltage is applied again. The operating principle is to chop the input voltage waveform by the conduction angle, generating a tangential output voltage waveform. Applying this tangential principle reduces the effective value of the output voltage, thereby reducing the power applied to common loads (resistive loads). Existing conventional thyristor constant-voltage power supplies generally only have dimming functions to save costs. Power supplies with color adjustment functions are expensive and require only pre-set color temperatures, which cannot be changed after installation, resulting in a poor user experience. Utility Model Content
[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a thyristor dimming circuit for a three-wire light strip that can achieve stepless dimming and color temperature adjustment.
[0004] According to an embodiment of the utility model, a thyristor dimming circuit applied to a three-wire light strip includes a main control module, a power-off detection module, a color adjustment drive module and a power supply module. The three-wire light strip includes a Y lamp group and a W lamp group with different color temperatures. One end of the Y lamp group and one end of the W lamp group are electrically connected to form a power supply end, the other end of the Y lamp group is a Y input end, and the other end of the W lamp group is a W input end. The mains power is electrically connected to the input end of the power supply module and the input end of the power-off detection module respectively through a thyristor dimmer, and the output end of the power supply module is electrically connected to the power supply end of the three-wire light strip; the power-off detection module is used to detect a power-off signal, and the output end of the power-off detection module is electrically connected to the input end of the main control module. The main control module controls the output PWM signal according to the number of times the power-off signal is detected to control the color adjustment drive module to output a W color adjustment signal and / or a Y color adjustment signal, which are respectively input to the W input end and the Y input end of the three-wire light strip, thereby realizing W / Y / W+Y color adjustment.
[0005] The thyristor dimming circuit applied to the three-wire light strip according to the embodiment of the present invention has at least the following beneficial effects: the thyristor dimmer generally has a physical switch and a dimming potentiometer. The present application adds a power-off detection module and a color adjustment drive module on the basis of the existing thyristor dimming power supply circuit. Before power is turned on, the initial W light output can be defaulted. After the physical switch of the thyristor dimmer is initially powered on, the color adjustment drive module outputs a W color adjustment signal to light up the W lamp group, and the dimming potentiometer can steplessly adjust the brightness of the W lamp group; after a certain period of time, the thyristor dimmer is turned on again. When the light is turned off once, the power-off detection module detects a power-off signal, and the main control module can control the color adjustment drive module to output the Y color adjustment signal to light up the Y lamp group, and the dimming potentiometer can infinitely adjust the brightness of the Y lamp group; when the light is turned on and off again within a certain period of time, the power-off detection module detects the second power-off signal, and the main control module controls the color adjustment drive module to synchronously output the W color adjustment signal and the Y color adjustment signal, so that the W lamp group and the Y lamp group are lit at the same time, realizing W+Y neutral color temperature color adjustment, and the dimming potentiometer can infinitely adjust the brightness; the structure is simple, cost-saving, and user experience is good.
[0006] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The following is a further description of the specific embodiments of the present invention in conjunction with the accompanying drawings;
[0008] Figure 1 It is the structural block diagram of the dimming circuit;
[0009] Figure 2 This is a partial schematic diagram of the dimming circuit;
[0010] Figure 3 This is the schematic diagram of the main control module and power module of the dimming circuit. DETAILED DESCRIPTION
[0011] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.
[0012] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.
[0013] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.
[0014] Reference Figures 1 to 3 The present invention is a thyristor dimming circuit for a three-wire light strip, comprising a main control module 10, a power-off detection module 11, a color adjustment drive module 12, and a power supply module 13. The three-wire light strip 20 comprises a Y lamp group and a W lamp group with different color temperatures. One end of the Y lamp group and one end of the W lamp group are electrically connected to form a power supply end. The other end of the Y lamp group is a Y input end, and the other end of the W lamp group is a W input end. The mains electricity is connected to the input end of the power supply module 13 and the input end of the power-off detection module 11 respectively through a thyristor dimmer 100. The input end is electrically connected, and the output end of the power module 13 is electrically connected to the power supply end of the three-wire light strip 20; the power-off detection module 11 is used to detect the power-off signal, and the output end of the power-off detection module 11 is electrically connected to the input end of the main control module 10. The main control module 10 controls the output of two PWM signals according to the number of times the power-off signal is detected to control the color adjustment drive module 12 to output the W color adjustment signal and / or the Y color adjustment signal, which are respectively input into the W input end and the Y input end of the three-wire light strip 20, thereby realizing W / Y / W+Y color adjustment. Thyristor dimmers generally have a physical switch and a dimming potentiometer. The present application adds a power-off detection module and a color adjustment drive module on the basis of the existing thyristor dimming power supply circuit. The initial W light output can be defaulted before power is turned on. After the physical switch of the thyristor dimmer is initially powered on, the color adjustment drive module outputs a W color adjustment signal to light up the W lamp group, and the dimming potentiometer can infinitely adjust the brightness of the W lamp group; after switching it on and off again within a certain period of time, the power-off detection module detects a power-off signal once, and the main control module can control the color adjustment drive module to output a Y color adjustment signal to light up the Y lamp group, and the dimming potentiometer can infinitely adjust the brightness of the Y lamp group; after switching it on and off again within a certain period of time, the power-off detection module detects a second power-off signal, and the main control module controls the color adjustment drive module to synchronously output a W color adjustment signal and a Y color adjustment signal, so that the W lamp group and the Y lamp group are lit at the same time, realizing W+Y neutral color temperature color adjustment, and the dimming potentiometer can infinitely adjust the brightness; the structure is simple, cost-saving, and user experience is good.
[0015] like Figure 2The power-off detection module 11 includes a MOS transistor Q1, a transistor Q2, a transistor Q3, a voltage regulator ZD1, a resistor R1, and an optocoupler U2. The source of the MOS transistor Q1 is electrically connected to the output end of the thyristor dimmer 100, the gate of the MOS transistor Q1 is electrically connected to the cathode of the voltage regulator ZD1 and the collector of the transistor Q2, the drain of the MOS transistor Q1 is electrically connected to the anode of the voltage regulator ZD1, one end of the capacitor C1, and the anode of the diode D1, the other end of the capacitor C1 and the cathode of the diode D1 are electrically connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, and the base of the transistor Q3 is connected in series. The resistor is electrically connected to the source of the MOS tube Q1, the collector of the transistor Q3 is electrically connected to one end of the resistor R1 and the input end of the optocoupler U2 respectively, the other end of the resistor R1 and the power supply end of the optocoupler U2 are respectively connected to the working voltage, and the output end of the optocoupler U2 is electrically connected to the main control module 10. When there is power, the optocoupler U2 is turned on, and when the power is off, the optocoupler U2 is cut off. The power-off signal is the cut-off signal of the optocoupler U2. When the main control module 10 detects the cut-off signal of the optocoupler U2 once / twice, it outputs two PWM signals to drive the color adjustment drive module 12 to output the W color adjustment signal and / or the Y color adjustment signal, thereby realizing W / Y / W+Y color adjustment.
[0016] like Figure 2In some embodiments, the main control module 10 includes a main control chip U1. The input end of the main control chip U1 is electrically connected to the output end of the optocoupler U2. The output end of the main control chip U1 can output two PWM signals, namely the OUTA signal and the OUTB signal. In order to ensure that the brightness remains unchanged when the W+Y two-way color mixing is performed, the two PWM signals can be output complementary. The color adjustment drive module 12 includes a W drive circuit and a Y drive circuit. The W drive circuit includes a MOS transistor Q4, a diode D2, a capacitor C2, a resistor R2, and a resistor R3. The OUTA signal is respectively input to the gate of the MOS transistor Q4 and one end of the resistor R2. The source of the MOS transistor Q4 is connected to the other end of the resistor R2 and one end of the capacitor C2 through the series resistor R3. The drain of the MOS transistor Q4 is electrically connected to the positive output end of the power module through the series diode D2. The drain of the MOS transistor Q4 is electrically connected to the other end of the capacitor C2 and outputs the W color adjustment. The Y driving circuit includes a MOS transistor Q5, a diode D3, a capacitor C3, a resistor R4, and a resistor R5. The OUTB signal is input to the gate of the MOS transistor Q5 and one end of the resistor R4, respectively. The source of the MOS transistor Q5 is connected to the other end of the resistor R4 and one end of the capacitor C3 via a series connection with the resistor R5, respectively, and is grounded. The drain of the MOS transistor Q5 is electrically connected to the positive output terminal of the power module 13 via a series connection with the diode D3. The drain of the MOS transistor Q5 is electrically connected to the other end of the capacitor C2 and outputs a Y color-adjusting signal to drive the Y light group to light up. The main control chip controls the color-adjusting drive module 12 via two PWM signals to output one of the Y color-adjusting signal and the W color-adjusting signal, or to output the Y color-adjusting signal and the W color-adjusting signal simultaneously, thereby lighting the W light group, the Y light group, or both the W light group and the Y light group. By adjusting the duty cycle of each of the two PWM signals, different degrees of color mixing can be achieved for the two-color light groups.
[0017] In certain embodiments, as Figure 3 The main control module 10 includes a digital isolation chip U01 electrically connected to the output end of the main control chip, and a level conversion chip U02 electrically connected to the output end of the digital isolation chip U01. The OUTA signal and the OUTB signal are output after being isolated by the digital isolation chip U01 and protected by the overcurrent protection and short-circuit protection of the level conversion chip U02 respectively.
[0018] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above preferred embodiments can be freely combined and superimposed.
[0019] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or directly or indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A thyristor dimming circuit for a three-wire light strip, characterized in that: include: A main control module (10), a power-off detection module (11), a color adjustment drive module (12), and a power supply module (13); a three-wire light strip (20) includes a Y light group and a W light group with different color temperatures; one end of the Y light group and one end of the W light group are electrically connected to form a power supply end; the other end of the Y light group is a Y input end, and the other end of the W light group is a W input end; the mains electricity is electrically connected to the input end of the power supply module (13) and the input end of the power-off detection module (11) respectively through a thyristor dimmer (100); and the output end of the power supply module (13) is electrically connected to the power supply end of the three-wire light strip (20); The power-off detection module (11) is used to detect a power-off signal. The output end of the power-off detection module (11) is electrically connected to the input end of the main control module (10). The main control module (10) controls the input PWM signal according to the number of times the power-off signal is detected to control the color adjustment drive module (12) to output a W color adjustment signal and / or a Y color adjustment signal, so as to input the W input end and the Y input end of the three-wire light strip (20) respectively, thereby realizing W / Y / W+Y color adjustment.
2. The thyristor dimming circuit for a three-wire light strip according to claim 1, characterized in that: The power-off detection module (11) comprises a MOS tube Q1, a triode Q2, a triode Q3, a voltage regulator ZD1, a resistor R1 and an optocoupler U2, wherein the source of the MOS tube Q1 is electrically connected to the output end of the thyristor dimmer (100), the gate of the MOS tube Q1 is electrically connected to the cathode of the voltage regulator ZD1 and the collector of the triode Q2, the drain of the MOS tube Q1 is electrically connected to the anode of the voltage regulator ZD1, one end of the capacitor C1 and the anode of the diode D1, and the gate of the capacitor C1 is electrically connected to the cathode of the voltage regulator ZD1 and the collector of the triode Q2. The other end and the cathode of the diode D1 are electrically connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the base of the transistor Q3 is electrically connected to the source of the MOS tube Q1 via a series resistor, the collector of the transistor Q3 is electrically connected to one end of the resistor R1 and the input end of the optocoupler U2, respectively, the other end of the resistor R1 and the power supply end of the optocoupler U2 are respectively connected to the working voltage, the output end of the optocoupler U2 is electrically connected to the main control module (10), and the power-off signal is the cut-off signal of the optocoupler U2.
3. The thyristor dimming circuit for a three-wire light strip according to claim 2, characterized in that: The main control module (10) comprises a main control chip U1, the input end of the main control chip U1 is electrically connected to the output end of the optical coupler U2, and the output end of the main control chip U1 can output two PWM signals, namely an OUTA signal and an OUTB signal.
4. The thyristor dimming circuit for a three-wire light strip according to claim 3, characterized in that: The main control module (10) comprises a digital isolation chip U01 electrically connected to the output end of the main control chip, and a level conversion chip U02 electrically connected to the output end of the digital isolation chip U01. The OUTA signal and the OUTB signal are output after being isolated by the digital isolation chip U01 and protected by overcurrent and short circuit protection of the level conversion chip U02.
5. The thyristor dimming circuit for a three-wire light strip according to claim 3, characterized in that: The color adjustment drive module (12) includes a W drive circuit and a Y drive circuit. The W drive circuit includes a MOS tube Q4, a diode D2, a capacitor C2, a resistor R2, and a resistor R3. The OUTA signal is respectively input to the gate of the MOS tube Q4 and one end of the resistor R2. The source of the MOS tube Q4 is connected in series with the resistor R3 and is grounded to the other end of the resistor R2 and one end of the capacitor C2. The drain of the MOS tube Q4 is electrically connected to the positive output end of the power module through the diode D2. The drain of the MOS tube Q4 is electrically connected to the other end of the capacitor C2 and outputs the W color adjustment signal. The Y driving circuit includes a MOS transistor Q5, a diode D3, a capacitor C3, a resistor R4, and a resistor R5. The OUTB signal is respectively input to the gate of the MOS transistor Q5 and one end of the resistor R4. The source of the MOS transistor Q5 is connected in series with the resistor R5, the other end of the resistor R4, and one end of the capacitor C3 to ground. The drain of the MOS transistor Q5 is electrically connected to the positive output terminal of the power module via the diode D3. The drain of the MOS transistor Q5 is electrically connected to the other end of the capacitor C2 and outputs the Y color adjustment signal to drive the Y lamp group to light up.