Low-harmonic silicon controlled rectifier dimming constant-power switch switching color temperature control circuit

Abstract

The utility model discloses a low harmonic silicon controlled rectifier dimming constant power switch switching color temperature control circuit, comprising a wall switch, one end of the wall switch is connected with a fuse through a silicon controlled rectifier dimmer, the other end of the wall switch is connected with a power supply AC-L end, and the fuse F1 is also connected with one end of a surge circuit, one end of a rectification circuit and one end of a fourteenth resistor R14. The AC-N end of the power supply is connected with the other end of the surge circuit and the other end of the rectification circuit, the rectification circuit is connected with the OUT end of the holding current regulator through a detection signal resistor, and the REXT end of the holding current regulator is connected with the RT end of the first constant current regulator and the RT end of the second constant current regulator through a seventh resistor. The RV end of the first constant current regulator is connected with one end of a third resistor and one end of a fifth resistor through a sixth resistor. According to the utility model, the circuit is simple, the power does not change along with the change of the input voltage, and the color temperature switching function of the silicon-controlled dimming linear wall-adjusting switch can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of color temperature control circuits, in particular to a low harmonic silicon controlled dimming constant power switch switching color temperature control circuit. Background Art

[0002] According to the new ErP regulations EU2019 / 2020 for lighting products and the current harmonic standard IEC 61000-3-2:2019 announced by the EU on December 5, 2019, current lighting products can no longer meet the needs of the European market. In order to meet the needs of the market and customers, various solution providers have upgraded and improved their products. The upgraded products have the following representative solutions: Figure 1 , Figure 2 As shown:

[0003] 1. Use linear scheme to realize ERP standard circuit diagram as follows Figure 1 As shown, the solution has no color temperature adjustment function and has a single function.

[0004] 2. If Figure 2 As shown, a switching power supply is used to achieve switching color adjustment. This solution has a color adjustment function, but cannot pass the ERP standard.

[0005] In summary, the existing solutions have the following disadvantages:

[0006] 1. The disadvantages of linear solutions are:

[0007] a. There is no color temperature adjustment function, scene control cannot be achieved, and the function is single;

[0008] b. No thyristor dimming function;

[0009] 2. Power off solution

[0010] aThis color temperature adjustment solution cannot meet ERP requirements;

[0011] b. Expensive. This solution requires a bulky transformer for energy storage and voltage reduction. The transformer is expensive, ranging from 1 yuan to several yuan.

[0012] c. It cannot be integrated. This solution requires a separate power module and cannot be integrated into LED lamps.

[0013] d. There are many peripheral circuits, and the switching power supply has a switching frequency. A large number of safety components need to pass safety and electromagnetic interference certification, so more peripheral devices are needed;

[0014] e is difficult to pass certification because the switch power supply control adopts PWM switch to achieve control, which has the problem of switching frequency. It is difficult to adjust the conduction noise and radiation noise during certification, and it is necessary to add safety devices to pass certification;

[0015] fNo thyristor dimming function.

[0016] In summary, the utility model designs a low harmonic thyristor dimming constant power switch switching color temperature control circuit. Utility Model Content

[0017] In view of the deficiencies in the prior art, the utility model aims to provide a low harmonic thyristor dimming constant power switch switching color temperature control circuit, which has a simple circuit and the power does not change with the input voltage, and can realize the thyristor dimming linear dimming wall switch switching color temperature adjustment function.

[0018] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a low harmonic thyristor dimming constant power switch switching color temperature control circuit, including a wall switch, one end of the wall switch is connected to the fuse through the thyristor dimmer, the other end of the wall switch is connected to the AC-L end of the power supply, the fuse F1 is also connected to one end of the surge circuit, one end of the rectifier circuit and one end of the fourteenth resistor R14, the AC-N end of the power supply is connected to the other end of the surge circuit and the other end of the rectifier circuit, the rectifier circuit is connected to the OUT end of the maintenance current regulator through the detection signal resistor, and the REXT end of the maintenance current regulator is connected to the first constant current regulator through the seventh resistor. The RT end of the regulator and the RT end of the second constant current regulator are connected, the RV end of the first constant current regulator is connected to one end of the third resistor and one end of the fifth resistor respectively through the sixth resistor, the other end of the third resistor is connected to the HI end of the first constant current regulator and the HI end of the second constant current regulator through a resistor, the third resistor is also connected to the cathode of the first diode and one end of the energy storage compensation capacitor, the other end of the energy storage compensation capacitor Ce1 is connected to the HI end of the first constant current regulator, one end of the third A resistor is connected, the RT end of the first constant current regulator is connected to the GND end of the first constant current regulator and the GND end of the second constant current regulator through the second resistor, and the first constant current regulator The CS end of the regulator is connected to the GND end of the first constant current regulator through the first resistor, the OUT end of the first constant current regulator is connected to the GND end of the first constant current regulator through the sixth capacitor, the RV end of the second constant current regulator is connected to the other end of the third A resistor and one end of the fifth A resistor through the sixth A resistor, the other end of the fifth A resistor is connected to the other end of the fifth resistor, the RT end of the second constant current regulator is connected to the GND end of the second constant current regulator through the second A resistor, the CS end of the second constant current regulator is connected to the GND end of the second constant current regulator through the first A resistor, and the GND end of the second constant current regulator is also connected to the second A resistor through the sixth A capacitor. The OUT end of the constant current regulator is connected, the other end of the fourteenth resistor is connected to the RL end of the color temperature control system through the fifteenth resistor, the VCC end of the color temperature control system is connected to the cathode of the first diode through the tenth resistor and the eleventh resistor in sequence, the VCC end of the color temperature control system is also connected to the GND end of the color temperature control system through the third capacitor, the VDD end of the color temperature control system is connected to the GND end of the temperature control system through the fourth capacitor, the C end of the color temperature control system is connected to the cathode of the first diode through a plurality of series-connected warm light color temperature lamp beads, and the W end of the color temperature control system is connected to the cathode of the first diode through a plurality of series-connected cold light color temperature lamp beads.

[0019] Preferably, the warm light color temperature lamp beads are lamp beads with any color temperature range of 1800K-5000K.

[0020] Preferably, the cold light color temperature lamp beads are lamp beads with any color temperature range of 2700K-10000K.

[0021] The utility model has the following beneficial effects:

[0022] 1. The circuit is simple, using the commonly used ERP standard linear constant current IC on the market as a linear constant current regulator and the commonly used color temperature adjustment function circuit on the market to cooperate with each other. There are very few components and the circuit is extremely simple;

[0023] 2. No need to write a specific program. This solution can use the commonly used color adjustment IC on the market as the color temperature control system, eliminating the trouble of debugging the program, making debugging easier and shortening the entire product development cycle;

[0024] 3. Electronic components are highly replaceable. All products in this line use common electronic components on the market. All electronic components can be found from multiple suppliers. Only electronic components with the same parameters and performance can be selected to avoid shortages and long delivery times from one supplier. There are multiple suppliers to choose from, and the selection is more diversified;

[0025] 4. Easy to pass certification, line linear drive, eliminating the problem of switching frequency, no audible noise when MOS is turned on and off, no conducted audible noise and radiated audible noise, no need to add any safety devices to save costs;

[0026] 5. The dimming effect is good, the dimming process experience is excellent, and there is no flickering phenomenon during the process;

[0027] 6. Easy to integrate. The solution implemented by this circuit does not require a bulky transformer and numerous safety components. The volume can be extremely small, which makes it very convenient to integrate it into LED lamps, making it a light source that integrates the driver and the lamp, reducing the volume and weight of the lamp.

[0028] 7. Low cost, because it adopts a linear drive solution, the circuit is simple, and the components are very few, which can greatly reduce the cost, make the product more competitive and more in line with market demand.

[0029] 8. Low harmonics, low flicker, in line with CE standards;

[0030] 9. Good color temperature adjustment effect: smooth switching without flickering;

[0031] 10. The constant power has high precision and the power does not change with the input voltage;

[0032] 11. System efficiency: when the dimmer is not connected, the current regulator is kept disconnected and does not work, which greatly improves the utilization efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The utility model is described in detail below with reference to the accompanying drawings and specific implementation methods;

[0034] Figure 1 It is the ERP standard roadmap of the existing technology;

[0035] Figure 2 It is a circuit diagram of realizing switch color adjustment by using switch power supply in the prior art;

[0036] Figure 3 This is a principle block diagram of the utility model;

[0037] Figure 4 This is a circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0039] Reference Figure 3-4The present specific implementation adopts the following technical scheme: a low harmonic thyristor dimming constant power switch switching color temperature control circuit, including a wall switch SW, one end of the wall switch SW is connected to the fuse F1 through the thyristor dimmer RT, the other end of the wall switch SW is connected to the AC-L end of the power supply, the fuse F1 is also connected to one end of the surge circuit V1, one end of the rectifier circuit BD1 and one end of the fourteenth resistor R14, the AC-N end of the power supply is connected to the other end of the surge circuit V1 and the other end of the rectifier circuit BD1, the rectifier circuit BD1 is connected to the OUT end of the maintenance current regulator U1 through the detection signal resistor RS, and the REXT end of the maintenance current regulator U1 is connected to the RT end of the first constant current regulator U2 and the second constant current regulator U2A through the seventh resistor R7. The RT end of the first constant current regulator U2 is connected to the RV end of the first constant current regulator U2, the RV end of the first constant current regulator U2 is connected to one end of the third resistor R3 and one end of the fifth resistor R5 through the sixth resistor R6, the other end of the third resistor R3 is connected to the HI end of the first constant current regulator U2 and the HI end of the second constant current regulator U2A through the resistor R4, the third resistor R3 is also connected to the cathode of the first diode D1 and one end of the energy storage compensation capacitor Ce1, the other end of the energy storage compensation capacitor Ce1 is connected to the HI end of the first constant current regulator U2, one end of the third A resistor R3A is connected, the RT end of the first constant current regulator U2 is connected to the GND end of the first constant current regulator U2 and the GND end of the second constant current regulator U2A through the second resistor R2, and the CS end of the first constant current regulator U2 is connected to the first resistor R1 is connected to the GND end of the first constant current regulator U2, the OUT end of the first constant current regulator U2 is connected to the GND end of the first constant current regulator U2 through the sixth capacitor C6, the RV end of the second constant current regulator U2A is connected to the other end of the third A resistor R3A and one end of the fifth A resistor R5 through the sixth A resistor R6A, the other end of the fifth A resistor R5 is connected to the other end of the fifth resistor R5, the RT end of the second constant current regulator U2A is connected to the GND end of the second constant current regulator U2A through the second A resistor R2A, the CS end of the second constant current regulator U2A is connected to the GND end of the second constant current regulator U2A through the first A resistor R1A, and the GND end of the second constant current regulator U2A is also connected to the second constant current regulator U2A through the sixth A capacitor C6A. The OUT end of the regulator U2A is connected, the other end of the fourteenth resistor R14 is connected to the RL end of the color temperature control system U3 through the fifteenth resistor R15, the VCC end of the color temperature control system U3 is connected to the cathode of the first diode D1 through the tenth resistor R10 and the eleventh resistor R11 in sequence, the VCC end of the color temperature control system U3 is also connected to the GND end of the color temperature control system U3 through the third capacitor C3, the VDD end of the color temperature control system U3 is connected to the GND end of the temperature control system U3 through the fourth capacitor C4, the C end of the color temperature control system U3 is connected to the cathode of the first diode D1 through a plurality of warm light color temperature lamp beads connected in series, and the W end of the color temperature control system U3 is connected to the cathode of the first diode D1 through a plurality of cold light color temperature lamp beads connected in series.

[0040] It is worth noting that the warm light color temperature lamp beads are lamp beads with any color temperature range of 1800K-5000K.

[0041] In addition, the cold light color temperature lamp beads are any color temperature lamp beads in the range of 2700K-10000K.

[0042] The wall switch SW in this specific embodiment controls the switching of the color temperature of the lamp by operating the switch on and off; the thyristor dimmer RT adjusts the size of the dimmer to change the brightness of the lamp; the surge circuit V1 protects the entire circuit system from damage by the surge voltage of the external power grid; the rectifier circuit BD1 rectifies the AC into a DC line; the linear constant current regulator is a regulator of the linear constant current ERP standard commonly used in the market; the fourth resistor R4 is a discharge resistor; the first resistor R1 and the first A resistor R1A are the harmonic current size setting resistors of the constant power regulator port; the second resistor R2 and the second A resistor R2A are the output current setting resistors; the third resistor R3, the fifth resistor R5, the sixth resistor R6, the third A resistor R3A, the fifth A resistor R5A, and the sixth A resistor R6A are constant power feedback compensation circuits; the fourteenth resistor R14 and the fifteenth resistor R15 are color temperature control system detection resistors; the tenth resistor R10 and the eleventh resistor R11 are color temperature control system power supply step-down current limiting resistors; the The third capacitor C3 is the color temperature control system supply capacitor; the fourth capacitor C4 is the color temperature memory capacitor after the color temperature control system is powered off; the maintenance current regulator U1 controls the output current by detecting the voltage of the OUT port, so that when there is no thyristor connected to the system, the OUT port is closed, and when there is a thyristor connected to the system, the OUT port is normally opened; RS is the detection signal resistor of the maintenance current regulator U1, which provides a voltage signal for the maintenance current regulator U1; the fifth resistor R5: dimmer maintenance current regulation, adjusting the size of this resistor can adjust the maintenance current of the dimmer to better match more brands of dimmers and make the dimming smoother; the color temperature control system U3 can be a popular single chip on the market, or a popular color temperature control integrated circuit on the market; W1-Wn: warm light color temperature lamp beads; L1-Ln: cold light color temperature lamp beads; W1-Wn: can be any color temperature lamp beads from 1800K to 5000K; L1-Ln: can be any color temperature lamp beads from 2700K to 10000K.

[0043] The working principle of this specific implementation is as follows:

[0044] The AC-L / AC-N terminals are connected to the 220V live wire and neutral wire or other power sources respectively. After the surge is absorbed by the fuse F1 and the surge circuit V1, one path is supplied to the fourteenth resistor R14 and the fifteenth resistor R15 of the color temperature control system for sampling. The other path is rectified by the rectifier circuit BD1 and divided into two paths. One path is passed through the detection signal resistor RS to provide a detection voltage signal for the maintenance current regulator. When the thyristor is not connected: when VOUT is less than a certain voltage, the OUT port is turned on and continues to detect. When VOUT is greater than the voltage and VOUT is less than another voltage within a certain period of time, the chip turns off the output current of the OUT port until each line network cycle is reset to improve the use efficiency of the entire product.

[0045] When the thyristor is connected: when VOUT is less than a certain voltage, the OUT port is turned on and continuously detected. When VOUT is greater than this voltage, and VOUT is greater than another voltage within a certain period of time, the chip will normally turn on the OUT port to output current in the next line network cycle until each line network cycle is reset.

[0046] When the thyristor-controlled dimmer is connected and it is detected that VOUT meets the set standard, the port outputs a maintaining current to the first constant current regulator U2 and the second constant current regulator U2A. The other path is divided into three paths after passing through the first diode D1. The first path goes to the positive pole of L1 and W1 to provide voltage to L1 and W1. At this time, L1 and W1 are in the waiting command state; the second path is the energy storage compensation capacitor Ce1, and the fourth resistor R4 compensates the current to the linear constant current regulator HI port to provide compensation current and high-voltage starting current voltage for HI. At this time, the linear constant current regulator enters the working state. By adjusting the external CS port resistor, the charging current of the electrolytic solution can be increased or decreased to meet the harmonic and flicker standards of ERP; the third path The path passes through the tenth resistor R10 and the eleventh resistor R11 to the color temperature control system VCC to supply power to the color temperature control system. When the voltage across the fourth capacitor C4 is greater than the threshold of the color temperature control system, the color temperature control system enters the working state. When the wall switch SW is closed, when adjusting the dimmer, the thyristor controls the constant current controller to provide a maintaining current through the seventh resistor R7, so that there will be no flickering during the dimming process, and the dimming is smoother. When the dimmer is slowly adjusted from the minimum to the maximum, the lamp is smoothly adjusted from the darkest brightness to the maximum brightness, and can also stop at a certain brightness in the middle; when the dimmer is slowly adjusted from the maximum to the minimum, the lamp is smoothly adjusted from the maximum brightness to the darkest brightness, and can also stop at a certain brightness in the middle;

[0047] When the color temperature needs to be switched, disconnect and connect the wall, the color temperature control system receives the ON / OFF signal from the wall switch and sends it to the RL port through the R tenth resistor 14 and the fifteenth resistor R15. The color temperature control system makes a relative judgment inside the edited program, and realizes the color temperature conversion function according to the corresponding logical sequence, and controls the built-in MOS tube of the color temperature control system to conduct and shut down, so as to control the on and off of the C and W ports to control the on and off current ratio of the L / W color temperature to realize the color temperature adjustment function. The selected color temperature lamp will memorize the current color temperature for about 30S, and the next time the lamp is turned on, it will be the color temperature selected last time; adjusting the ratio of the third resistor R3, the fifth resistor R5, the sixth resistor R6, the third A resistor R3A, the fifth A resistor R5A, and the sixth A resistor R6A can adjust the accuracy of the constant power; adjusting the second resistor R2 and the second A resistor R2A can adjust the output brightness and power of each product.

[0048] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A low harmonic thyristor dimming constant power switch switching color temperature control circuit, characterized in that: The invention comprises a wall switch (SW), wherein one end of the wall switch (SW) is connected to a fuse (F1) through a thyristor dimmer (RT), the other end of the wall switch (SW) is connected to an AC-L end of a power supply, the fuse (F1) is also connected to one end of a surge circuit (V1), one end of a rectifier circuit (BD1) and one end of a fourteenth resistor (R14), the AC-N end of the power supply is connected to the other end of the surge circuit (V1) and the other end of the rectifier circuit (BD1), the rectifier circuit (BD1) is connected to an OUT end of a maintaining current regulator (U1) through a detection signal resistor (RS), and the REXT end of the maintaining current regulator (U1) is connected to an RT end of a first constant current regulator (U2) and a second constant current regulator (U2A) through a seventh resistor (R7). The RT end of the first constant current regulator (U2) is connected to the RT end of the first constant current regulator (U2), the RV end of the first constant current regulator (U2) is respectively connected to one end of the third resistor (R3) and one end of the fifth resistor (R5) through a sixth resistor (R6), the other end of the third resistor (R3) is connected to the HI end of the first constant current regulator (U2) and the HI end of the second constant current regulator (U2A) through a resistor (R4), the third resistor (R3) is also connected to the negative electrode of the first diode (D1) and one end of the energy storage compensation capacitor (Ce1), the other end of the energy storage compensation capacitor (Ce1) is connected to the HI end of the first constant current regulator (U2), one end of the third A resistor (R3A) is connected, and the RT end of the first constant current regulator (U2) is connected to the GND of the first constant current regulator (U2) through the second resistor (R2). The first constant current regulator (U2A) is connected to the GND end of the first constant current regulator (U2) through the first resistor (R1), the OUT end of the first constant current regulator (U2) is connected to the GND end of the first constant current regulator (U2) through the sixth capacitor (C6), the RV end of the second constant current regulator (U2A) is connected to the other end of the third A resistor (R3A) and one end of the fifth A resistor (R5) through the sixth A resistor (R6A), the other end of the fifth A resistor (R5) is connected to the other end of the fifth resistor (R5), and the RT end of the second constant current regulator (U2A) is connected to the GND end of the second constant current regulator (U2A) through the second A resistor (R2A). The CS end of the second constant current regulator (U2A) is connected to the GND end of the second constant current regulator (U2A) through the first A resistor (R1A), the GND end of the second constant current regulator (U2A) is also connected to the OUT end of the second constant current regulator (U2A) through the sixth A capacitor (C6A), the other end of the fourteenth resistor (R14) is connected to the RL end of the color temperature control system (U3) through the fifteenth resistor (R15), the VCC end of the color temperature control system (U3) is connected to the cathode of the first diode (D1) through the tenth resistor (R10) and the eleventh resistor (R11) in sequence, and the VCC end of the color temperature control system (U3) is also connected to the GND end of the color temperature control system (U3) through the third capacitor (C3),The VDD end of the color temperature control system (U3) is connected to the GND end of the temperature control system (U3) through a fourth capacitor (C4), the C end of the color temperature control system (U3) is connected to the cathode of the first diode (D1) through a plurality of series-connected warm light color temperature lamp beads, and the W end of the color temperature control system (U3) is connected to the cathode of the first diode (D1) through a plurality of series-connected cold light color temperature lamp beads.

2. A low harmonic thyristor dimming constant power switch switching color temperature control circuit according to claim 1, characterized in that: The warm light color temperature lamp beads are lamp beads with any color temperature range of 1800K-5000K.

3. A low harmonic thyristor dimming constant power switch switching color temperature control circuit according to claim 1, characterized in that: The cold light color temperature lamp beads are any color temperature lamp beads in the range of 2700K-10000K.

Images