CN219678713U - Secondary detection and signal superposition type dimming control circuit - Google Patents
Secondary detection and signal superposition type dimming control circuit Download PDFInfo
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- CN219678713U CN219678713U CN202320642837.0U CN202320642837U CN219678713U CN 219678713 U CN219678713 U CN 219678713U CN 202320642837 U CN202320642837 U CN 202320642837U CN 219678713 U CN219678713 U CN 219678713U
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Abstract
The utility model discloses a secondary detection and signal superposition type dimming control circuit, which comprises a mains supply input rectifying and filtering circuit, a transformer circuit, a main control circuit, a color temperature output circuit, a switch detection circuit, a current gear and color temperature control circuit and a constant voltage and constant current feedback circuit, wherein the input end of the switch detection circuit is electrically connected with a secondary coil of the transformer circuit, and the output end of the switch detection circuit is electrically connected with a sampling end of the current gear and color temperature control circuit; the signal input end of the current gear and color temperature control circuit is connected with the output end of the switch detection circuit, and the signal output end of the current gear and color temperature control circuit is electrically connected with the color temperature output circuit. The utility model has reasonable structural arrangement, is provided with the switch detection circuit matched with the current gear and the color temperature control circuit, samples the secondary coil of the transformer circuit through the switch detection circuit, has simple circuit, fewer components and sensitive response, is favorable for improving the effectiveness of color temperature control, and has strong applicability and good practicability.
Description
Technical Field
The utility model belongs to the technical field of LED power supplies, and particularly relates to a secondary detection and signal superposition type dimming control circuit.
Background
Due to the fact that the LED control technology is mature, the LED control technology has excellent dimming and color mixing characteristics, the industry design level in the industry is improved continuously, the lamp has not only basic illumination function, the light requirements for multiple scenes are more and more prominent, the light requirements for multiple scenes are more and more strong, the same space needs to be met, multiple light requirements for work, meeting, gathering, entertainment and rest are met, the requirements for illuminance and color temperature of ambient light are different under different use scenes, and therefore the lamp is provided with a brightness regulator and color temperature regulation, and the requirements are more strong.
The main dimming modes in the market at present are as follows: the dimming modes of silicon controlled rectifier dimming, 0-10V dimming, DALI and the like can be divided into analog dimming and digital dimming according to the mode of control signals; although the dimming modes can meet the use requirements of general conditions, special dimming equipment, control circuits and ICs are needed, the circuits are complex and the cost performance is low, and in the dimming application of a small-range single space of a family, the dimming and toning LED power supply on the market is generally realized by adopting a special IC, generally only the color temperature is changed, and the output current of the LED power supply cannot be changed at the same time; the practicality is not good, so suitability and practicality are limited.
Disclosure of Invention
The utility model aims to provide a secondary detection and signal superposition type dimming control circuit which is reasonable in structural arrangement and strong in applicability.
The technical proposal for realizing the aim of the utility model is a secondary detection and signal superposition type dimming control circuit, which comprises a mains supply input rectifying and filtering circuit, a transformer circuit, a main control circuit, a color temperature output circuit, a switch detection circuit, a current gear and color temperature control circuit and a constant voltage and constant current feedback circuit,
the mains supply input rectifying and filtering circuit is connected with the mains supply and carries out rectifying and filtering on the mains supply;
the primary coil of the transformer circuit is electrically connected with the output end of the mains supply input rectifying and filtering circuit;
the main control circuit is electrically connected with the transformer circuit and is used for controlling the transformer circuit and carrying out voltage-current conversion on direct current input by the mains supply into the rectifying and filtering circuit;
the color temperature output circuit is electrically connected with the secondary coil of the transformer circuit, the current gear and the control end of the color temperature control circuit;
the input end of the switch detection circuit is electrically connected with the secondary coil of the transformer circuit, the output end of the switch detection circuit is electrically connected with the sampling end of the current gear and color temperature control circuit, and the switch detection circuit is mainly used for sampling the secondary coil of the transformer circuit and outputting control signals after processing sampling signals to the current gear and color temperature control circuit;
the signal input end of the current gear and color temperature control circuit is connected with the output end of the switch detection circuit, and the signal output end of the current gear and color temperature control circuit is electrically connected with the color temperature output circuit for controlling the color temperature of the LED power supply;
the constant voltage and constant current feedback circuit is connected between the current gear and color temperature control circuit and the main control circuit, and is used for sampling the current of the current gear and color temperature control circuit and realizing the constant current output current of the LED power supply.
Further preferred are: the switch detection circuit comprises a first unidirectional diode, a first resistor, a second zener diode, a first capacitor and a fourth resistor;
the positive pole of first unidirectional diode with transformer circuit's secondary coil electricity is connected, the negative pole of first unidirectional diode is connected with the one end of first resistance, the other end of first resistance is connected with current gear and colour temperature control circuit's signal input part electricity, second zener diode, first electric capacity and fourth resistance are parallelly connected, and one end after parallelly connected is connected between first resistance and current gear and colour temperature control circuit's signal input part, and the other end ground connection.
Further preferred are: the current gear and color temperature control circuit comprises a singlechip, a power supply voltage stabilizing filter circuit and a resistor-capacitor network circuit;
the output end of the power supply voltage stabilizing filter circuit is electrically connected with the power supply end of the singlechip, and the input end of the power supply voltage stabilizing filter circuit is electrically connected with the LED lamp bead;
the input end of the resistance-capacitance network circuit is electrically connected with the pin of the singlechip, and the output end of the resistance-capacitance network circuit is electrically connected with the signal input end of the constant voltage and constant current feedback circuit;
the output end of the singlechip is electrically connected with the control end of the color temperature output circuit, and the end part of the first resistor is connected to a fifth pin of the singlechip.
Further preferred are: the resistor-capacitor network circuit comprises a twenty-fifth resistor, a ninth diode, a thirty-sixth resistor, a twelfth capacitor, a thirty-fifth resistor, a thirty-fourth resistor and an eleventh capacitor;
one end of the thirty-fourth resistor and one end of the thirty-sixth resistor are connected in series and then connected to a seventh pin of the singlechip, and one end of the thirty-fourth resistor is connected to a signal input pin of the constant voltage and constant current feedback circuit;
after the twenty-fifth resistor is connected with the ninth diode in series, the positive electrode of the ninth diode is connected to a sixth pin of the singlechip, and the other end of the twenty-fifth resistor is connected to a connection point of the thirty-fourth resistor and the thirty-sixth resistor;
the twelfth capacitor and the thirty-fifth resistor are connected in parallel, one end of the twelfth capacitor is grounded, the other end of the eleventh capacitor is connected to the connection point of the thirty-fourth resistor and the thirty-sixth resistor after being connected in parallel, and one end of the eleventh capacitor is connected to a signal input pin of the constant current feedback circuit, and the other end of the eleventh capacitor is grounded.
The utility model has the positive effects that: the utility model has reasonable structural arrangement, is provided with the switch detection circuit matched with the current gear and the color temperature control circuit, samples the secondary coil of the transformer circuit through the switch detection circuit, has simple circuit, few components, sensitive response, high detection reliability, convenient installation, no need of a special equipment system and a special dimming IC, improves the universality, changes the output current by detecting the working state of the transformer to achieve the effect of regulating the brightness, is beneficial to improving the effectiveness of the color temperature control, and has strong applicability and good practicability.
Drawings
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments that are illustrated in the appended drawings, in which:
fig. 1 is a specific circuit diagram of the present utility model.
Reference numerals: the device comprises a mains supply input rectifying and filtering circuit 1, a transformer circuit 2, a main control circuit 3, a color temperature output circuit 4, a switch detection circuit 5, a current gear and color temperature control circuit 6 and a constant voltage and constant current feedback circuit 7.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
Referring to fig. 1, a secondary detection and signal superposition type dimming control circuit comprises a mains supply input rectifying and filtering circuit 1, a transformer circuit 2, a main control circuit 3, a color temperature output circuit 4, a switch detection circuit 5, a current gear and color temperature control circuit 6 and a constant voltage and constant current feedback circuit 7;
the switch detection circuit 5 comprises a first unidirectional diode D1, a first resistor R1, a second zener diode D2, a first capacitor C1 and a fourth resistor R4;
the positive pole of first unidirectional diode D1 with the secondary coil electricity of transformer circuit 2 is connected, the negative pole of first unidirectional diode D1 is connected with the one end of first resistance R1, the other end of first resistance R1 is connected with the signal input part electricity of electric current gear and colour temperature control circuit 6, second zener diode D2, first electric capacity C1 and fourth resistance R4 are parallelly connected, and one end after parallelly connected is connected between the signal input part of first resistance R1 and electric current gear and colour temperature control circuit 2, and the other end ground connection.
The working principle of a switch detection circuit is as follows: when the power supply AC supplies power normally and the power supply works normally, a secondary winding working signal of the transformer circuit is rectified by D1, R4 and C1 are subjected to partial pressure filtering to obtain a stable high level, D2 is a clamping diode, and the pin of U3 is prevented from being damaged due to overhigh voltage; when the power supply AC is disconnected for 0.1-5S, the transformer stops working, and R4 rapidly discharges the charge of C1 to obtain a low level; therefore, in the process of powering up, powering down and powering up of the AC power supply, the pin 5 of the U3 obtains a high-low-high rectangular wave signal; because the parameter setting is ingenious and reasonable, the signal is completely synchronous with the on-off state of the AC, no delay exists, and because the capacity of the power supply capacitor C9 of the U3 is large, the maintenance time of the working voltage 5.1V of the U3 can reach more than 5S even in the AC off period, and the U3 can normally work when the power is off, the on-off-on sampling of the LED power supply can be carried out, and corresponding processing is carried out. The secondary sampling circuit has the advantages of simple circuit, few components, sensitive response, high reliability and high practical value.
In this embodiment, the mains input rectifying and filtering circuit is connected with the mains and rectifies and filters the mains;
the primary coil of the transformer circuit is electrically connected with the output end of the mains supply input rectifying and filtering circuit;
the main control circuit is electrically connected with the transformer circuit and is used for controlling the transformer circuit and carrying out voltage-current conversion on direct current input by the mains supply into the rectifying and filtering circuit;
the color temperature output circuit is electrically connected with the secondary coil of the transformer circuit, the current gear and the control end of the color temperature control circuit;
the input end of the switch detection circuit is electrically connected with the secondary coil of the transformer circuit, the output end of the switch detection circuit is electrically connected with the sampling end of the current gear and color temperature control circuit, and the switch detection circuit is mainly used for sampling the secondary coil of the transformer circuit and outputting control signals after processing sampling signals to the current gear and color temperature control circuit;
the signal input end of the current gear and color temperature control circuit is connected with the output end of the switch detection circuit, and the signal output end of the current gear and color temperature control circuit is electrically connected with the color temperature output circuit for controlling the color temperature of the LED power supply;
the constant voltage and constant current feedback circuit is connected between the current gear and color temperature control circuit and the main control circuit, and is used for sampling the current of the current gear and color temperature control circuit and realizing the constant current output current of the LED power supply.
In the practical application process, the constant voltage and constant current feedback circuit detects and feeds back the voltage and current output by the LED lamp beads in real time, and the voltage and current are rapidly compared and fed back to the main control circuit, and meanwhile the main control circuit is used for adjusting the working state so as to ensure the stability of the output voltage and current.
The current gear and color temperature control circuit 6 comprises a singlechip U3, a power supply voltage stabilizing filter circuit 61 and a resistor-capacitor network circuit 62; the power supply voltage stabilizing filter circuit 61 comprises R19, D8, C6 and C9, and is specifically shown in a circuit diagram.
The resistor-capacitor network circuit comprises a twenty-fifth resistor R25, a ninth diode D9, a thirty-sixth resistor R36, a twelfth capacitor C12, a thirty-fifth resistor R35, a thirty-fourth resistor R34 and an eleventh capacitor C11;
the output end of the power supply voltage stabilizing filter circuit is electrically connected with the power supply end of the singlechip, and the input end of the power supply voltage stabilizing filter circuit is electrically connected with the LED lamp bead;
the input end of the resistance-capacitance network circuit is electrically connected with the pin of the singlechip, and the output end of the resistance-capacitance network circuit is electrically connected with the signal input end of the constant voltage and constant current feedback circuit;
the output end of the singlechip is electrically connected with the control end of the color temperature output circuit, and the end part of the first resistor is connected to a fifth pin of the singlechip.
One end of the thirty-sixth resistor R36 is connected to a seventh pin of the singlechip U3 after the thirty-fourth resistor R34 and the thirty-sixth resistor R36 are connected in series, and one end of the thirty-fourth resistor R34 is connected to a signal input pin of the constant voltage and constant current feedback circuit 7;
after the twenty-fifth resistor R25 is connected in series with the ninth diode D9, the positive electrode of the ninth diode D9 is connected to a sixth pin of the singlechip U3, and the other end of the twenty-fifth resistor R25 is connected to a connection point between the thirty-fourth resistor R34 and the thirty-sixth resistor R36;
the twelfth capacitor C12 and the thirty-fifth resistor R35 are connected in parallel, one end of the twelfth capacitor C is grounded, the other end of the twelfth capacitor C is connected to the connection point of the thirty-fourth resistor R34 and the thirty-sixth resistor R36 after the twelfth capacitor C and the thirty-fifth resistor R35 are connected in parallel,
one end of the eleventh capacitor C11 is connected to the signal input pin of the constant voltage and constant current feedback circuit 7, and the other end of the eleventh capacitor C is grounded.
Specifically, referring to the circuit diagram shown in fig. 1, the commercial power AC220V is rectified and filtered by a commercial power input rectifying and filtering circuit, and the rectifying bridges BD1 and C5 convert the alternating current into smooth direct current, where the EMI elements C3 and L1 are used for inhibiting the disturbance voltage generated by the back flyback power supply circuit, so as to prevent interference with other electric equipment.
U2 is a built-in standard constant voltage and constant current control IC, the model is a conventional model in the prior art, the 5 th pin of U2 is an input pin (input end of a current sampling signal) of a current control loop, R23 is an input resistor of current sampling, R19, D8, C6 and C9 are power supply voltage stabilizing filter circuits of U3, and R34, R35, R36, R25, D9, C11 and C12 form a resistor-capacitor network which is connected between the 6 pin and 7 pin of U3 and the 5 pin of U2 (input end of the current sampling signal). When the voltage of the 6 pin and the 7 pin of the U3 is changed, the 5 pin of the U2 is influenced through a resistor-capacitor network, and a current sampling input signal is influenced, so that the constant current output current of the LED power supply is changed, and the required constant current output current can be obtained by reasonably selecting the ratio of R25, R36 and R35 and then matching with the output voltage of the U3.
The working principle of the current gear and color temperature control circuit is briefly described as follows: when AC is electrified for the 1 st time, the 3 pin and the 2 pin of the U3 output high level, the Q2 and the Q1 are conducted through the R6 and the R7 driving resistors, the two paths of LED yellow and white lights are simultaneously lighted, and the 5 pin and the 6 pin of the U3 output low level, at the moment, the output current of the LED power supply is mainly determined by a sampling circuit, and the influence of the R34, the R35 and the R36 resistance network is small. When the power is on for the 2 nd time (the power-off interval is 0.1-3S) after the AC, the pin 2 of the U3 outputs a high level, the Q1 is driven to be conducted through the R7, and the LED Bai Guangliang is powered on; 3 feet are low level, Q2 is cut off, and yellow light is not bright; the output of U3 is high level 5V, the output of 6 pin is low level 0V, the voltage is divided by R36, R35, the input is input to the 5 pin of the current sampling input end U2 through R34, the output current of the LED power supply is changed at this time, and the current value is determined by sampling circuits R10// R14// R15// R16, R23 and voltage dividing networks R35, R36 together. When the power is on for the 3 rd time after AC (the power-off interval is 0.1-3S), the output of the pin 2 of U3 is low level, Q1 is cut off, and the LED white light is not bright; 3-pin high level drives Q2 to be conducted through R6, huang Guangliang; the 7 output of U3 is 0V, the 6 output is 5V, the voltage is divided by D9, R25 and R35, the divided voltage is input to the 5 pin of the current sampling input end U2 through R34, the output current of the LED power supply is changed at the moment, and the current value is determined by sampling circuits R10// R14// R15// R16 and R23 and voltage dividing networks D9, R25 and R36. 4 th to 5 th to 6 th times, the power is turned off and the power is turned on, and the output is circularly carried out according to the sequence.
U3 is the singlechip, writes internal program according to actual demand, just can open and shut according to wall switch, the input break-make detection of AC changes the electric current and the output colour temperature of LED power to change the colour temperature and the luminance of lamps and lanterns, satisfy different light modulation demands, satisfy the light demand of the multiple sceneries of same space.
The utility model has reasonable structural arrangement, is provided with the switch detection circuit matched with the current gear and the color temperature control circuit, samples the secondary coil of the transformer circuit through the switch detection circuit, has simple circuit, few components, sensitive response, high detection reliability, convenient installation, no need of a special equipment system and a special dimming IC, improves the universality, changes the output current by detecting the working state of the transformer to achieve the effect of regulating the brightness, is beneficial to improving the effectiveness of the color temperature control, and has strong applicability and good practicability.
The standard components used in this embodiment may be purchased directly from the market, but the nonstandard structural components described in the specification may also be obtained directly by unambiguous processing according to the common general knowledge in the prior art, and meanwhile, the connection manner of each component adopts the conventional means mature in the prior art, and the machinery, the components and the equipment all adopt the conventional types in the prior art, so that no specific description will be made here.
It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While those obvious variations or modifications which come within the spirit of the utility model remain within the scope of the utility model.
Claims (4)
1. The utility model provides a secondary detection and signal superposition formula dimming control circuit, includes commercial power input rectifying filter circuit, transformer circuit, master control circuit, colour temperature output circuit, switch detection circuit, electric current gear and colour temperature control circuit and constant voltage constant current feedback circuit, its characterized in that:
the mains supply input rectifying and filtering circuit is connected with the mains supply and carries out rectifying and filtering on the mains supply;
the primary coil of the transformer circuit is electrically connected with the output end of the mains supply input rectifying and filtering circuit;
the main control circuit is electrically connected with the transformer circuit and is used for controlling the transformer circuit and carrying out voltage-current conversion on direct current input by the mains supply into the rectifying and filtering circuit;
the color temperature output circuit is electrically connected with the secondary coil of the transformer circuit, the current gear and the control end of the color temperature control circuit;
the input end of the switch detection circuit is electrically connected with the secondary coil of the transformer circuit, the output end of the switch detection circuit is electrically connected with the sampling end of the current gear and color temperature control circuit, and the switch detection circuit is mainly used for sampling the secondary coil of the transformer circuit and outputting control signals after processing sampling signals to the current gear and color temperature control circuit;
the signal input end of the current gear and color temperature control circuit is connected with the output end of the switch detection circuit, and the signal output end of the current gear and color temperature control circuit is electrically connected with the color temperature output circuit for controlling the color temperature of the LED power supply;
the constant voltage and constant current feedback circuit is connected between the current gear and color temperature control circuit and the main control circuit, and is used for sampling the current of the current gear and color temperature control circuit and realizing the constant current output current of the LED power supply.
2. The secondary detection and signal superposition dimming control circuit according to claim 1, wherein: the switch detection circuit comprises a first unidirectional diode, a first resistor, a second zener diode, a first capacitor and a fourth resistor;
the positive pole of first unidirectional diode with transformer circuit's secondary coil electricity is connected, the negative pole of first unidirectional diode is connected with the one end of first resistance, the other end of first resistance is connected with current gear and colour temperature control circuit's signal input part electricity, second zener diode, first electric capacity and fourth resistance are parallelly connected, and one end after parallelly connected is connected between first resistance and current gear and colour temperature control circuit's signal input part, and the other end ground connection.
3. The secondary detection and signal superposition dimming control circuit according to claim 2, wherein: the current gear and color temperature control circuit comprises a singlechip, a power supply voltage stabilizing filter circuit and a resistor-capacitor network circuit;
the output end of the power supply voltage stabilizing filter circuit is electrically connected with the power supply end of the singlechip, and the input end of the power supply voltage stabilizing filter circuit is electrically connected with the LED lamp bead;
the input end of the resistance-capacitance network circuit is electrically connected with the pin of the singlechip, and the output end of the resistance-capacitance network circuit is electrically connected with the signal input end of the constant voltage and constant current feedback circuit;
the output end of the singlechip is electrically connected with the control end of the color temperature output circuit, and the end part of the first resistor is connected to a fifth pin of the singlechip.
4. A secondary detection and signal superposition dimming control circuit according to claim 3, wherein: the resistor-capacitor network circuit comprises a twenty-fifth resistor, a ninth diode, a thirty-sixth resistor, a twelfth capacitor, a thirty-fifth resistor, a thirty-fourth resistor and an eleventh capacitor;
one end of the thirty-fourth resistor and one end of the thirty-sixth resistor are connected in series and then connected to a seventh pin of the singlechip, and one end of the thirty-fourth resistor is connected to a signal input pin of the constant voltage and constant current feedback circuit;
after the twenty-fifth resistor is connected with the ninth diode in series, the positive electrode of the ninth diode is connected to a sixth pin of the singlechip, and the other end of the twenty-fifth resistor is connected to a connection point of the thirty-fourth resistor and the thirty-sixth resistor;
the twelfth capacitor and the thirty-fifth resistor are connected in parallel, one end of the twelfth capacitor is grounded, the other end of the eleventh capacitor is connected to the connection point of the thirty-fourth resistor and the thirty-sixth resistor after being connected in parallel, and one end of the eleventh capacitor is connected to a signal input pin of the constant current feedback circuit, and the other end of the eleventh capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320642837.0U CN219678713U (en) | 2023-03-29 | 2023-03-29 | Secondary detection and signal superposition type dimming control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320642837.0U CN219678713U (en) | 2023-03-29 | 2023-03-29 | Secondary detection and signal superposition type dimming control circuit |
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| CN219678713U true CN219678713U (en) | 2023-09-12 |
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| CN202320642837.0U Active CN219678713U (en) | 2023-03-29 | 2023-03-29 | Secondary detection and signal superposition type dimming control circuit |
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| CN (1) | CN219678713U (en) |
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