CN111132417A - Double-color temperature circuit and control method thereof - Google Patents
Double-color temperature circuit and control method thereof Download PDFInfo
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- CN111132417A CN111132417A CN201911201248.3A CN201911201248A CN111132417A CN 111132417 A CN111132417 A CN 111132417A CN 201911201248 A CN201911201248 A CN 201911201248A CN 111132417 A CN111132417 A CN 111132417A
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Abstract
The invention discloses a bicolor temperature circuit and a control method thereof, wherein the bicolor temperature circuit comprises the following steps: the LED lamp comprises a rectification module, a color temperature adjusting circuit, a first group of LED lamp strings, a second group of LED lamp strings and a PWM signal output circuit, wherein the input end of the rectification module is connected with a mains supply, the output end of the rectification module is connected with the color temperature adjusting circuit, the input end of the color temperature adjusting circuit is connected with the rectification module, the output end of the color temperature adjusting circuit comprises a first output port and a second output port, the first output port is connected with the first group of LED lamp strings, the second output port is connected with the second group of LED lamp strings, and the control end of the color temperature adjusting circuit is connected with the PWM. According to the LED lamp, the currents of the first LED lamp string and the second LED lamp string are consistent through the diode D2 and the filter inductor L1, the defect that the number of two paths of LEDs needs to be consistent is overcome, and the color temperature adjustment and the brightness adjustment are simultaneously carried out through adjusting the resistance values of the adjustable resistor R55 and the adjustable resistor R66 through the PLC control module.
Description
Technical Field
The invention relates to the technical field of LED lamps, in particular to a double-color temperature circuit and a control method thereof.
Background
At present, most of color temperature adjusting circuits of LED lamps adopt a double-switch circuit mode to adjust the color temperature of LEDs, when two switches are disconnected, a capacitor is adopted to absorb and store the voltage of an output end, the switch tube is prevented from being damaged due to overvoltage, and when energy is stored by adopting the capacitor, the number of the LED lamps output in two paths is consistent, the condition of uneven current is prevented, and certain defects exist; meanwhile, when the LED lamp is turned off and turned on, the color temperature adjusting circuit can output no-load voltage, certain energy waste is caused, and meanwhile, the no-load voltage is often larger than the voltage of the LED lamp, so that the problem of LED flicker can be caused when the LED lamp is connected.
For example, a "circuit for adjusting the light and the color temperature of an LED" disclosed in the Chinese patent document, its publication No. CN204810631U, published 2015, 11, 25, includes at least one warm light string and at least one cold light string, which are used to adjust light and color temperature, the LED dimming and color temperature regulating circuit comprises a main controller for generating a path of dimming PWM signal and a path of color temperature regulating PWM signal, a PWM control unit connected with the main controller and a color temperature regulating unit connected with the main controller, the input side of the PWM control unit is connected with the AC input end through a rectifying and filtering unit, the output side of the PWM control unit is connected with the LED lamp string through a power control unit, the PWM control unit receives a dimming PWM signal from the main controller, the power control unit is used for carrying out level conversion on the LED lamp string and then outputting a first PWM control signal for controlling the power control unit to be switched on and off so as to adjust the current input to the LED lamp string; the color temperature adjusting unit comprises a first switch circuit connected to the warm light string and a second switch circuit connected to the cold light string, wherein the conduction levels of the first switch circuit and the second switch circuit are opposite, and color temperature adjusting PWM signals from the main controller are respectively output to the first switch circuit and the second switch circuit to adjust the brightness ratio of the warm light string and the cold light string, so that the color temperature of the LED string is adjusted. The color temperature of the LED is adjusted through the PWM signal, but the overvoltage protection is still performed by adopting a capacitor, the cost is high, the defect that the number of LED lamps needs to be consistent exists, and the color temperature of the circuit cannot be adjusted simultaneously when the circuit is used for dimming.
Disclosure of Invention
The invention mainly solves the problems that the color temperature circuit in the prior art has high cost and the number of two connected LED lamps needs to be consistent; the double-color temperature circuit and the control method thereof are provided, the problem that the number of two paths of LED lamps needs to be consistent is solved, energy is saved, and the color temperature and the brightness of the LED lamp string can be adjusted simultaneously.
The technical problem of the invention is mainly solved by the following technical scheme: a double-color temperature circuit comprises a rectifying module, a color temperature adjusting circuit, a first group of LED lamp strings, a second group of LED lamp strings and a PWM signal output circuit, wherein the input end of the rectifying module is connected with mains supply, the output end of the rectifying module is connected with the color temperature adjusting circuit, and the rectifying module is used for rectifying the mains supply and outputting direct current to the color temperature adjusting circuit; the input end of the color temperature adjusting circuit is connected with the rectifying module, the output end of the color temperature adjusting circuit comprises a first output port and a second output port, the first output port is connected with the first group of LED lamp strings, the second output port is connected with the second group of LED lamp strings, and the control end of the color temperature adjusting circuit is connected with the PWM signal output circuit; the PWM signal output circuit is used for outputting PWM signals to change the duty ratio of a first output port and a second output port of the color temperature adjusting circuit, so that the color temperatures of the first group of LED lamp strings and the second group of LED lamp strings are changed. The commercial power is converted into direct current through the rectifying module and is supplied to the color temperature adjusting circuit, the color temperature adjusting circuit adjusts the color temperature of the first group of LED lamp strings and the second group of LED lamp strings under the control of the PWM signals output by the PWM signal output circuit, so that the color temperature adjustment of the LEDs is realized, meanwhile, the color temperature adjusting circuit also realizes the adjustment of the current, and the brightness adjustment of the LEDs is realized.
Preferably, the color temperature adjusting circuit includes a switching tube S1, a switching tube S2, a switching tube S3, a diode D1, a diode D2, a current-limiting resistor R1 and a filter inductor L1, one end of the current-limiting resistor R1 is connected to the positive electrode of the output terminal of the rectifier module, the other end of the current-limiting resistor R1 is connected to the first end of the switching tube S1, the second end of the switching tube S1 is connected to one end of the filter inductor L1 and the cathode of the diode D1, the other end of the filter inductor L1 is connected to the anode of the diode D2, one end of the first LED string and one end of the second LED string, the other end of the first LED string is connected to the first end of the switching tube S2, the other end of the second LED string is connected to the first end of the switching tube S3, the second end of the switching tube S2, the second end of the switching tube S3, the negative electrode of the rectifier module and the anode of the diode D1 are all grounded, the cathode of the diode D2 is connected to the rectifying module, and the control terminal of the switching tube S1, the control terminal of the switching tube S2 and the control terminal of the switching tube S3 are all connected to the PWM signal output circuit. The current limiting resistor R1 is used for limiting the current flowing into the rectifying module, the circuit is effectively protected, the overcurrent damage of the circuit is prevented, the current input into the LED lamp string is delayed through the filter inductor L1, the overcurrent damage or the overvoltage damage of the LED lamp string is prevented, meanwhile, the current transmitted by the filter inductor L1 is divided through the diode D2 and flows back to the input end of the circuit, the overvoltage damage of the switch tube S2 and the switch tube S3 is effectively prevented, the number of the first group of LED lamp strings and the second group of LED lamp strings can be different, the PWM signal output circuit outputs a PWM signal to control the on-off of the switch tube S1 and control the current flowing through the switch tube S1, the brightness adjustment of the first group of LED lamp strings and the second group of LED lamp strings is realized, meanwhile, the PWM signal output circuit outputs another PWM signal to control the on-off of the switch tube S2 and the switch tube S3, the duty ratio of the switch tube S2 and the switch, the color temperature of the first group of LED lamp strings and the second group of LED lamp strings can be adjusted, the currents of the first group of LED lamp strings and the second group of LED lamp strings are consistent through the diode D2 and the filter inductor L1, the capacitor is omitted, and the defect that the number of two paths of LEDs needs to be consistent is overcome.
Preferably, the color temperature adjusting circuit includes a switch tube S4, a switch tube S5, a switch tube S6, a diode D3, a diode D4, a current-limiting resistor R2 and a filter inductor L2, wherein a cathode of the diode D3 is respectively connected to an anode of an output end of the rectifier module, a first end of the switch tube S5 and a first end of the switch tube S6, a second end of the switch tube S5 is connected to the first group of LED strings, a second end of the switch tube S6 is connected to the second group of LED strings, an anode of the diode D3 is respectively connected to a first end of the switch tube S4 and one end of the filter inductor L2, a second end of the switch tube S4 is connected to one end of the current-limiting resistor R2, another end of the current-limiting resistor R2 is respectively connected to a cathode of an output end of the rectifier module and an anode of the diode D4, a cathode of the diode D4, another end of the filter inductor L2, another end of the first group of the LED strings, the control end of the switch tube S4, the control end of the switch tube S5 and the control end of the switch tube S6 are all connected with the PWM signal output circuit. The current limiting resistor R2 is used for limiting the current flowing into the rectifying module, the circuit is effectively protected, overcurrent damage of the circuit is prevented, the current input into the LED lamp string is delayed through the filter inductor L2, overcurrent damage or overvoltage damage of the LED lamp string is prevented, meanwhile, the current flowing through the switch tube S4 is divided through the diode D4, overcurrent damage of the switch tube S4 is effectively prevented, the PWM signal output circuit outputs a PWM signal to control the on-off of the switch tube S4 and control the magnitude of the current flowing through the switch tube S4, brightness adjustment of the first group of LED lamp string and the second group of LED lamp string is achieved, meanwhile, the PWM signal output circuit outputs another PWM signal to control the on-off of the switch tube S5 and the switch tube S6, the magnitudes of the switch tube S5 and the switch tube S6 are adjusted, and the duty ratio adjustment of the first group of LED lamp string and the second group of LED lamp string is achieved.
Preferably, the power supply further comprises an IGBT inverter module and a diode D22, wherein the rectifier module is an IGBT rectifier module, the input end of the IGBT inverter module is connected with the cathode of the diode D2, and the output end of the IGBT inverter module is connected with the anode of the diode D22, the cathode of the diode D22 is connected with the input end of the IGBT rectifier module. Through IGBT contravariant module and IGBT rectifier module, in feeding back surplus voltage to the commercial power electric wire netting, recycle the energy, effectively reduce the waste of electric energy.
Preferably, the power supply further comprises a standby power supply, a first change-over switch, a second change-over switch, a power supply electric quantity detection circuit and a switch control circuit, wherein a first end of the first change-over switch is connected with the other end of the current-limiting resistor R1, a second end of the first change-over switch is provided with a first contact and a second contact, a first end of the second change-over switch is provided with a third contact and a fourth contact, the first contact of the first change-over switch is connected with a first end of the switch tube S1, the second contact of the first change-over switch is connected with the third contact of the second change-over switch, the fourth contact of the second change-over switch is connected with a first end of the switch tube S1, a second end of the second change-over switch is connected with the positive pole of the standby power supply, the negative pole of the standby power supply is connected with the negative pole of the output end of the rectification module, and the power supply circuit, and the control end of the first change-over switch and the control end of the second change-over switch are both connected with the switch control circuit. The circuit has three working states including that the commercial power directly supplies power to the LED lamp string, the standby power supplies power to the LED lamp string and the commercial power supplies power to the standby power, when the switch tube S2 and the switch tube S3 are turned off simultaneously, the commercial power still supplies power for a short time, due to the delay effect of the filter inductor L1, the redundant power of the commercial power is transmitted back to the rectifying module through the filter inductor L1 and the diode D2, the switch control circuit controls the first change-over switch and the second change-over switch while the switch tube S2 and the switch tube S3 are turned off, the output end of the rectifying module is connected with the standby power, the redundant voltage provided by the commercial power is stored in the standby power, the power stored in the standby power is detected by the power supply power detection circuit, when the power in the standby power is full, the first change-over switch and the second change-over switch are controlled by the switch control circuit, the standby power supply is connected with the switch tube S1, and the LED lamp string is supplied with power through the standby power supply, so that the electric energy is effectively saved, and the electric energy is reasonably applied.
Preferably, the LED lamp further comprises an adjustable resistor R55, an adjustable resistor R66 and a PLC control module, wherein the first end of the adjustable resistor R55 is connected with the second end of the switch tube S2, the second end of the adjustable resistor R55 is connected with one end of the first group of LED lamp strings, the control end of the adjustable resistor R55 is connected with the PLC control module, the first end of the adjustable resistor R66 is connected with the second end of the switch tube S3, the second end of the adjustable resistor R66 is connected with one end of the second group of LED lamp strings, and the control end of the adjustable resistor R66 is connected with the PLC control module. The PLC control module outputs a control command to the adjustable resistor R55 and the adjustable resistor R66, and changes the resistance values of the adjustable resistor R55 and the adjustable resistor R66, so that the current flowing through the first group of LED lamp strings and the current flowing through the second group of LED lamp strings are changed, the PWM signal output circuit outputs a PWM signal to control the switch tube S2 and the switch tube S3 to adjust the color temperature of the LED lamp strings, and meanwhile, the brightness of the LED lamp strings is adjusted, and the color temperature adjustment and the brightness adjustment are simultaneously carried out.
Preferably, the drive circuit further comprises a drive circuit, the drive circuit comprises a drive chip, a resistor R77, a resistor R88, a capacitor C7, a brightness adjustment signal EN and an operational amplifier U1, one end of the resistor R77 is connected to the output end of the PWM signal output circuit, the other end of the resistor R77 is connected to one end of the resistor R88, a first end of the capacitor C7 and a positive-phase input end of the operational amplifier U1, the other end of the resistor R88 is connected to a second end of the capacitor C7, an output end of the operational amplifier U1 is connected to a negative-phase input end of the operational amplifier U1 and an IADJ pin of the drive chip, a GND pin of the drive chip is connected to a negative electrode of the output terminal of the rectifier module, a CSP pin of the drive chip is connected to one end of the current-limiting resistor R1, a CSN pin of the drive chip is connected to the other end of the resistor current-limiting R1, a pgn pin of the drive chip is connected, and an EN pin of the driving chip is connected with a brightness adjusting signal EN. The drive chip adopts the TI LM3409 chip, and operational amplifier U1's model is LM321A, adjusts the luminance and the colour temperature of LED lamp cluster through PWM signal and luminance control signal EN, makes the regulation of LED lamp cluster more intelligent convenient, and the application scene is abundanter.
Preferably, the PWM signal output circuit outputs Iset _ PWM signal to one end of the resistor R77, the PWM signal output circuit outputs CT _ PWM1 signal to the control end of the switching tube S2, and the PWM signal output circuit outputs CT _ PWM2 signal to the control end of the switching tube S3. The LED lamp string is controlled in a segmented mode by sending different PWM signals, so that the LED lamp string is convenient to use by a user, and the application range of the LED lamp is widened.
The invention also provides a control method of the bicolor temperature circuit, which comprises the following steps of controlling the brightness value of the LED in sections: a first stage: the brightness value is between 10 and 100; the duty ratio of the Iset _ PWM signal is changed between 0.1 and 1 by adjusting the Iset _ PWM signal, and the brightness adjusting signal EN is at a high level to enable the brightness value to be between 10 and 100; the CT _ PWM1 signal is complementary with the CT _ PWM2 signal in duty ratio and is a PWM signal with the frequency of 4KHZ, and the color temperature value is adjusted by adjusting the duty ratio of the CT _ PWM1 signal and the CT _ PWM2 signal; wherein, the color temperature value is CT _ PWM1 signal duty ratio multiplied by 100; and a second stage: the brightness value is between 1 and 10; adjusting the brightness value by adjusting the duty ratio of the Iset _ PWM signal to be 0.1, and adjusting the duty ratio of the brightness adjusting signal EN, wherein the brightness value is equal to the duty ratio multiplied by 10 of the brightness adjusting signal EN; the color temperature value is adjusted by adjusting the duty ratio of the CT _ PWM1 signal and the CT _ PWM2 signal; wherein, the color temperature value is (CT _ PWM1 signal duty ratio × 1000)/brightness value. Through the different adjustment of the color temperature at different brightness values, the user can use the LED lamp string to achieve better visual effect and more comfortable feeling, so that the LED lamp is more suitable for more occasions.
The invention has the beneficial effects that: (1) the diode D2 and the filter inductor L1 enable the currents of the first group of LED lamp strings and the second group of LED lamp strings to be consistent, the capacitor is eliminated, and the defect that the number of two paths of LEDs needs to be consistent is overcome; (2) redundant voltage is fed back to a mains supply power grid through the IGBT inversion module and the IGBT rectification module, so that energy can be recycled, and waste of electric energy is effectively reduced; (3) the standby power supply supplies power to the LED lamp string, so that the electric energy is effectively saved and reasonably used; (4) the resistance values of the adjustable resistor R55 and the adjustable resistor R66 are adjusted through the PLC control module, so that color temperature adjustment and brightness adjustment are simultaneously carried out; (5) the brightness of the LED lamp is controlled in a segmented mode through the control method, so that the LED lamp is convenient to use by a user, and the application range of the LED lamp is widened.
Drawings
FIG. 1 is a block diagram of a dual color temperature circuit of the present invention.
Fig. 2 is a schematic connection diagram of a color temperature adjusting circuit according to the first embodiment.
Fig. 3 is a schematic diagram of the connection of the color temperature adjusting circuit according to the second embodiment.
Fig. 4 is a schematic diagram of a color temperature adjusting circuit according to a third embodiment.
Fig. 5 is a schematic diagram of a color temperature adjusting circuit according to a fourth embodiment.
Fig. 6 is a schematic diagram of the color temperature adjusting circuit according to the fifth embodiment.
Fig. 7 is a signal waveform diagram of the sixth embodiment.
Fig. 8 is a signal waveform diagram of the seventh embodiment.
In the figure, 1, a rectifying module, 2, a color temperature regulating circuit, 3, a PWM signal output circuit, 4, a first group of LED lamp strings, 5, a second group of LED lamp strings, 6, an IGBT inverter module, 7, a power supply electric quantity detection circuit, 8, a switch control circuit, 9, a standby power supply and 10, a PLC control module.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
The first embodiment is as follows: a two-color temperature circuit is shown in figure 1 and comprises a rectification module 1, a color temperature adjusting circuit 2, a first group of LED lamp strings 4, a second group of LED lamp strings 5, a driving circuit and a PWM signal output circuit 3, wherein the input end of the rectification module 1 is connected with a mains supply, the output end of the rectification module 1 is connected with the color temperature adjusting circuit 2, and the rectification module 1 is used for rectifying the mains supply and outputting direct current to the color temperature adjusting circuit 2; the input end of the color temperature adjusting circuit 2 is connected with the rectifying module 1, the output end of the color temperature adjusting circuit 2 comprises a first output port and a second output port, the first output port is connected with the first group of LED lamp strings 4, the second output port is connected with the second group of LED lamp strings 5, and the control end of the color temperature adjusting circuit 2 is connected with the PWM signal output circuit 3; the PWM signal output circuit 3 is used for outputting a PWM signal to change the duty ratio of the first output port and the second output port of the color temperature adjusting circuit 2, thereby changing the color temperatures of the first group of LED light strings and the second group of LED light strings.
As shown in fig. 2, the color temperature adjusting circuit 2 includes a switch tube S1, a switch tube S2, a switch tube S3, a diode D1, a diode D2, a current limiting resistor R1, and a filter inductor L1, one end of the current limiting resistor R1 is connected to the positive electrode of the output end of the rectifier module 1, the other end of the current limiting resistor R1 is connected to the first end of the switch tube S1, the second end of the switch tube S1 is connected to one end of the filter inductor L1 and the cathode of the diode D1, the other end of the filter inductor L1 is connected to the anode of the diode D2, one end of the first LED string DL1, and one end of the second LED DL2, the other end of the first LED string DL1 is connected to the first end of the switch tube S2, the other end of the second LED string DL 9 is connected to the first end of the switch tube S3, the second end of the switch tube S2, the second end of the switch tube S3, the negative electrode of the output end of the rectifier module and, the cathode of the diode D2 is connected with the rectifier module 1, the control end of the switch tube S2 and the control end of the switch tube S3 are both connected with the PWM signal output circuit 3, the switch tube S1 is a PMOS tube, the switch tube S2 and the switch tube S3 are both NMOS tubes, the drive circuit comprises a drive chip, a resistor R77, a resistor R88, a capacitor C7, a brightness adjustment signal EN and an operational amplifier U1, one end of the resistor R77 is connected with the output end of the PWM signal output circuit, the other end of the resistor R77 is respectively connected with one end of a resistor R88, a first end of a capacitor C7 and the positive input end of an operational amplifier U1, the other end of the resistor R88 is connected with the second end of a capacitor C7, the output end of the operational amplifier U1 is respectively connected with the negative input end of the operational amplifier U1 and the IA pin of the drive chip, the pin of the drive chip is connected with the cathode of the output end of the rectifier module, the pin of the drive chip D, the CSN pin of the driving chip is connected with the other end of the current-limiting resistor R1, the PGATE pin of the driving chip is connected with the control end of the switch tube S1, the EN pin of the driving chip is connected with a brightness adjusting signal EN, the PWM signal output circuit outputs an Iset _ PWM signal to one end of the resistor R77, the PWM signal output circuit outputs a CT _ PWM1 signal to the control end of the switch tube S2, and the PWM signal output circuit outputs a CT _ PWM2 signal to the control end of the switch tube S3.
In the specific application, the commercial power is connected to the input end of the rectifier module 1, the commercial power is converted into direct current, the direct current is output from the output end of the rectifier module 1, the direct current output by the rectifier module 1 is limited by the current limiting resistor R1, the circuit is prevented from being damaged due to overlarge current, the circuit is effectively protected, the current input into the LED lamp string is delayed by the filter inductor L1, the LED lamp string is prevented from being damaged due to overcurrent or overvoltage, meanwhile, the current transmitted by the filter inductor L1 is divided by the diode D2 and flows back to the input end of the circuit, the overvoltage damage of the switch tube S2 and the switch tube S3 is effectively prevented, the number of the first LED lamp string and the second LED lamp string can be different, the PWM signal output circuit 3 outputs a PWM signal to control the on-off of the switch tube S1, the current flowing through the switch tube S1 is controlled, and the brightness of the first LED lamp string, meanwhile, the PWM signal output circuit 3 outputs another PWM signal to control the on/off of the switch tube S2 and the switch tube S3, and adjusts the duty ratio of the switch tube S2 and the switch tube S3 to realize the color temperature adjustment of the first group of LED light strings and the second group of LED light strings, and the currents of the first group of LED light strings and the second group of LED light strings are consistent through the diode D2 and the filter inductor L1, thereby eliminating the capacitor and solving the defect that the number of two paths of LEDs needs to be consistent.
In a second embodiment, as shown in fig. 3, the color temperature adjusting circuit 2 includes a switching tube S4, a switching tube S5, a switching tube S6, a diode D3, a diode D4, a current-limiting resistor R2, and a filter inductor L2, and the rest of the structure is the same as that in the first embodiment; the cathode of the diode D3 is connected with the anode of the output end of the rectifier module 1, the first end of the switch tube S5 and the first end of the switch tube S6, the second end of the switch tube S5 is connected with the first group of LED lamp strings DL1, the second end of the switch tube S6 is connected with the second group of LED lamp strings DL2, the anode of the diode D3 is connected with the first end of the switch tube S4 and one end of the filter inductor L2, the second end of the switch tube S4 is connected with one end of the current limiting resistor R2, the other end of the current limiting resistor R2 is connected with the cathode of the output end of the rectifier module 1 and the anode of the diode D4, the cathode of the diode D4, the other end of the filter inductor L2, the other end of the first group of LED lamp strings DL1 and the other end of the second group of LED lamp strings DL2 are all grounded, the control end of the switch tube S4, the control end of the switch tube S5 and the control end of the switch tube S6 are all, the switch tube S5 and the switch tube S6 are both PMOS tubes. The first embodiment is that the current is divided by the diode D4, and when the switching tube S5 and the switching tube S6 are disconnected, the switching tube S4 is protected to prevent the switching tube S4 from overvoltage or overcurrent damage.
In a third embodiment, as shown in fig. 4, compared with the first embodiment, in the present embodiment, an IGBT inverter module 6 and a diode D22 are added, the rectifier module 1 is an IGBT rectifier module 1, an input end of the IGBT inverter module 6 is connected to a cathode of the diode D2, and an output end of the IGBT inverter module 6 is connected to an anode of the diode D22, and a cathode of the diode D22 is connected to an input end of the IGBT rectifier module 1. This embodiment is through increasing IGBT contravariant module 6, when PWM signal control switch tube S2 and switch tube S3 of PWM signal output circuit 3 output turn-offs simultaneously, the commercial power still supplies power to electric power in an instant, carry out the delay back to the electric current through filter inductance L1, get into IGBT contravariant module 6 through diode D2, change the direct current into the alternating current through IGBT contravariant module 6, feed back the electric wire netting, carry out recycle with the electric energy, energy saving, reduce LED' S power consumption cost.
In a fourth embodiment, as shown in fig. 5, compared with the first embodiment, the present embodiment adds a standby power supply 9, a first switch SW1, a second switch SW2, a power supply capacity detection circuit 7 and a switch control circuit 8, wherein a first end of the first switch SW1 is connected to the other end of the current limiting resistor R1, a second end of the first switch SW1 is provided with a first contact and a second contact, a first end of the second switch SW2 is provided with a third contact and a fourth contact, the first contact of the first switch SW1 is connected to the first end of the switch tube S1, the second contact of the first switch SW1 is connected to the third contact of the second switch SW2, the fourth contact of the second switch SW2 is connected to the first end of the switch tube S1, the second end of the second switch SW2 is connected to the positive pole of the standby power supply 9, the negative pole of the standby power supply 9 is connected to the output terminal of the rectifier module 1, the power circuit detection circuit is connected to the backup power supply 9, and the control terminal of the first switch SW1 and the control terminal of the second switch SW2 are both connected to the switch control circuit 8. The circuit has three working states including that the commercial power directly supplies power to the LED lamp string, the standby power supply 9 supplies power to the LED lamp string and the commercial power supplies power to the standby power supply 9 through the first change-over switch SW1 and the second change-over switch SW2, when the switch tube S2 and the switch tube S3 are turned off simultaneously, the commercial power still supplies power for a short time, because of the delay effect of the filter inductor L1, the redundant power of the commercial power is transmitted back to the rectifying module 1 through the filter inductor L1 and the diode D2, when the switch tube S2 and the switch tube S3 are turned off, the switch control circuit 8 controls the first change-over switch SW1 and the second change-over switch SW2 to connect the output end of the rectifying module 1 with the standby power supply 9, the redundant voltage provided by the commercial power supply 9 is stored in the standby power supply 9, the power supply power quantity detection circuit 7 detects the power quantity stored in the standby power supply 9, when the power quantity in the standby power supply, the switch control circuit 8 controls the first switch SW1 and the second switch SW2 to enable the standby power supply 9 to be connected with the switch tube S1, the standby power supply 9 supplies power to the LED lamp string, electric energy is effectively saved, and reasonable application of the electric energy is realized.
In a fifth embodiment, as shown in fig. 6, in the first embodiment, an adjustable resistor R55, an adjustable resistor R66 and a PLC control module 10 are added, a first end of the adjustable resistor R55 is connected to a second end of the switch tube S2, a second end of the adjustable resistor R55 is connected to one end of the first group of LED strings DL1, a control end of the adjustable resistor R55 is connected to the PLC control module 10, a first end of the adjustable resistor R66 is connected to a second end of the switch tube S3, a second end of the adjustable resistor R66 is connected to one end of the second group of LED strings DL2, and a control end of the adjustable resistor R66 is connected to the PLC control module 10. The PLC control module 10 outputs a control command to the adjustable resistor R55 and the adjustable resistor R66, and the resistance values of the adjustable resistor R55 and the adjustable resistor R66 are changed, so that the current flowing through the first group of LED lamp strings and the current flowing through the second group of LED lamp strings are changed, the PWM signal output circuit 3 outputs a PWM signal to control the switch tube S2 and the switch tube S3 to adjust the color temperature of the LED lamp strings, and meanwhile, the brightness of the LED lamp strings is adjusted, and the color temperature adjustment and the brightness adjustment are simultaneously carried out.
Sixth embodiment, a control method of a two-color temperature circuit, as shown in fig. 7, controls luminance values of LEDs in segments: a first stage: the brightness value is between 10 and 100; the duty ratio of the Iset _ PWM signal is changed between 0.1 and 1 by adjusting the Iset _ PWM signal, and the brightness adjusting signal EN is at a high level to enable the brightness value to be between 10 and 100; the CT _ PWM1 signal is complementary with the CT _ PWM2 signal in duty ratio and is a PWM signal with the frequency of 4KHZ, and the color temperature value is adjusted by adjusting the duty ratio of the CT _ PWM1 signal and the CT _ PWM2 signal; wherein, the color temperature value is CT _ PWM1 signal duty ratio multiplied by 100; and a second stage: the brightness value is between 1 and 10; adjusting the brightness value by adjusting the duty ratio of the Iset _ PWM signal to be 0.1, and adjusting the duty ratio of the brightness adjusting signal EN, wherein the brightness value is equal to the duty ratio multiplied by 10 of the brightness adjusting signal EN; the color temperature value is adjusted by adjusting the duty ratio of the CT _ PWM1 signal and the CT _ PWM2 signal; wherein, the color temperature value is (CT _ PWM1 signal duty ratio × 1000)/brightness value. If the brightness value is 60 and the color temperature value is 30, the duty ratio of the Iset _ PWM signal is adjusted to be 0.6, EN is 1, the CT _ PWM1 signal is 0.3, and the CT _ PWM2 is adjusted to be 0.7.
In embodiment 7, as shown in fig. 8, if the brightness value is adjusted to 5 and the color temperature value is adjusted to 50, the duty ratio of the Iset _ PWM signal is adjusted to 0.1, EN is adjusted to 0.5, the CT _ PWM1 signal is adjusted to 0.25, and CT _ PWM2 is adjusted to 0.75. The brightness and the color temperature of the LED lamp string are more humanized and intelligent by carrying out sectional regulation control on the LED lamp string.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (9)
1. A two-color temperature circuit is characterized by comprising
The LED lamp comprises a rectification module, a color temperature adjusting circuit, a first group of LED lamp strings, a second group of LED lamp strings and a PWM signal output circuit, wherein the input end of the rectification module is connected with mains supply, the output end of the rectification module is connected with the color temperature adjusting circuit, and the rectification module is used for rectifying the mains supply and outputting direct current to the color temperature adjusting circuit;
the input end of the color temperature adjusting circuit is connected with the rectifying module, the output end of the color temperature adjusting circuit comprises a first output port and a second output port, the first output port is connected with the first group of LED lamp strings, the second output port is connected with the second group of LED lamp strings, and the control end of the color temperature adjusting circuit is connected with the PWM signal output circuit;
the PWM signal output circuit is used for outputting PWM signals to change the duty ratio of a first output port and a second output port of the color temperature adjusting circuit, so that the color temperatures of the first group of LED lamp strings and the second group of LED lamp strings are changed.
2. The bicolor temperature circuit of claim 1, wherein the color temperature adjusting circuit comprises a switch tube S1, a switch tube S2, a switch tube S3, a diode D1, a diode D2, a current limiting resistor R1 and a filter inductor L1, one end of the current limiting resistor R1 is connected with the positive electrode of the output end of the rectifying module, the other end of the current limiting resistor R1 is connected with the first end of a switch tube S1, the second end of the switch tube S1 is connected with one end of a filter inductor L1 and the cathode of the diode D1, the other end of the filter inductor L1 is connected with the anode of the diode D2, one end of a first LED string and one end of a second LED string, the other end of the first LED string is connected with the first end of the switch tube S2, the other end of the second LED string is connected with the first end of the switch tube S3, and the second end of the switch tube S2 is connected with the first end of the switch tube S35, The second end of the switch tube S3, the negative electrode of the output end of the rectifying module and the anode of the diode D1 are all grounded, the cathode of the diode D2 is connected to the rectifying module, and the control end of the switch tube S1, the control end of the switch tube S2 and the control end of the switch tube S3 are all connected to the PWM signal output circuit.
3. The bicolor temperature circuit of claim 1, wherein the color temperature adjusting circuit comprises a switch tube S4, a switch tube S5, a switch tube S6, a diode D3, a diode D4, a current limiting resistor R2 and a filter inductor L2, wherein a cathode of the diode D3 is connected to an anode of an output end of the rectifier module, a first end of the switch tube S5 and a first end of the switch tube S6, a second end of the switch tube S5 is connected to the first group of LED strings, a second end of the switch tube S6 is connected to the second group of LED strings, an anode of the diode D3 is connected to a first end of the switch tube S4 and one end of the filter inductor L2, a second end of the switch tube S4 is connected to one end of a current limiting resistor R2, another end of the current limiting resistor R2 is connected to a cathode of the output end of the rectifier module and a cathode of the diode D4, and a cathode of the diode D4, The other end of the filter inductor L2, the other end of the first group of LED lamp strings and the other end of the second group of LED lamp strings are all grounded, and the control end of the switch tube S4, the control end of the switch tube S5 and the control end of the switch tube S6 are all connected with the PWM signal output circuit.
4. The bichromatic temperature circuit of claim 2, further comprising an IGBT inversion module and a diode D22, wherein the rectification module is an IGBT rectification module, the input end of the IGBT inversion module is connected with the cathode of the diode D2, the output end of the IGBT inversion module is connected with the anode of the diode D22, the cathode of the diode D22 is connected with the input end of the IGBT rectification module.
5. The two-color temperature circuit according to claim 2, further comprising a standby power supply, a first switch, a second switch, a power supply capacity detection circuit and a switch control circuit, wherein a first end of the first switch is connected to the other end of the current limiting resistor R1, a second end of the first switch is provided with a first contact and a second contact, a first end of the second switch is provided with a third contact and a fourth contact, the first contact of the first switch is connected to the first end of the switch tube S1, the second contact of the first switch is connected to the third contact of the second switch, the fourth contact of the second switch is connected to the first end of the switch tube S1, the second end of the second switch is connected to the positive pole of the standby power supply, the negative pole of the standby power supply is connected to the negative pole of the output terminal of the rectification module, the power circuit detection circuit is connected with the standby power supply, and the control end of the first change-over switch and the control end of the second change-over switch are both connected with the switch control circuit.
6. The bicolor temperature circuit of claim 2, further comprising an adjustable resistor R55, an adjustable resistor R66 and a PLC control module, wherein a first end of the adjustable resistor R55 is connected with a second end of the switch tube S2, a second end of the adjustable resistor R55 is connected with one end of the first group of LED light strings, a control end of the adjustable resistor R55 is connected with the PLC control module, a first end of the adjustable resistor R66 is connected with a second end of the switch tube S3, a second end of the adjustable resistor R66 is connected with one end of the second group of LED light strings, and a control end of the adjustable resistor R66 is connected with the PLC control module.
7. The two-color temperature circuit of claim 2, further comprising a driving circuit, wherein the driving circuit comprises a driving chip, a resistor R77, a resistor R88, a capacitor C7, a brightness adjustment signal EN, and an operational amplifier U1, one end of the resistor R77 is connected to the output terminal of the PWM signal output circuit, the other end of the resistor R77 is connected to one end of a resistor R88, a first end of a capacitor C7, and a positive input terminal of an operational amplifier U1, the other end of the resistor R88 is connected to a second end of the capacitor C7, an output terminal of the operational amplifier U1 is connected to the negative input terminal of the operational amplifier U1 and a DJ IA pin of the driving chip, a GND pin of the driving chip is connected to the negative terminal of the rectifying module, a CSP pin of the driving chip is connected to one end of a current limiting resistor R1, a CSN pin of the driving chip is connected to the other end of a current limiting resistor R1, the PGATE pin of the driving chip is connected with the control end of the switch tube S1, and the EN pin of the driving chip is connected with a brightness adjusting signal EN.
8. The bi-color temperature circuit of claim 7, wherein the PWM signal output circuit outputs Iset _ PWM signal to one terminal of the resistor R77, the PWM signal output circuit outputs CT _ PWM1 signal to the control terminal of the switch tube S2, and the PWM signal output circuit outputs CT _ PWM2 signal to the control terminal of the switch tube S3.
9. A control method of a two-color temperature circuit, which is applied to the two-color temperature circuit as claimed in any one of claims 1 to 8, comprising the steps of controlling the brightness value of the LED in a segmented manner:
a first stage: the brightness value is between 10 and 100; the duty ratio of the Iset _ PWM signal is changed between 0.1 and 1 by adjusting the Iset _ PWM signal, and the brightness adjusting signal EN is at a high level to enable the brightness value to be between 10 and 100; the CT _ PWM1 signal is complementary with the CT _ PWM2 signal in duty ratio and is a PWM signal with the frequency of 4KHZ, and the color temperature value is adjusted by adjusting the duty ratio of the CT _ PWM1 signal and the CT _ PWM2 signal; wherein, the color temperature value is CT _ PWM1 signal duty ratio multiplied by 100;
and a second stage: the brightness value is between 1 and 10; adjusting the brightness value by adjusting the duty ratio of the Iset _ PWM signal to be 0.1, and adjusting the duty ratio of the brightness adjusting signal EN, wherein the brightness value is equal to the duty ratio multiplied by 10 of the brightness adjusting signal EN; the color temperature value is adjusted by adjusting the duty ratio of the CT _ PWM1 signal and the CT _ PWM2 signal; wherein, the color temperature value is (CT _ PWM1 signal duty ratio × 1000)/brightness value.
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