CN213073181U - Isolation dimming color-mixing LED driving circuit and driver - Google Patents
Isolation dimming color-mixing LED driving circuit and driver Download PDFInfo
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- CN213073181U CN213073181U CN202021512075.5U CN202021512075U CN213073181U CN 213073181 U CN213073181 U CN 213073181U CN 202021512075 U CN202021512075 U CN 202021512075U CN 213073181 U CN213073181 U CN 213073181U
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Abstract
The utility model discloses an isolation light-adjusting color-adjusting LED drive circuit and a driver, which comprises a first rectifying and filtering circuit; the switch circuit is connected with the first rectifying and filtering circuit; the isolation transformer is connected with the switch circuit; the second rectifying and filtering circuit is connected with the isolation transformer; the color matching circuit is connected with the second rectifying and filtering circuit; the first control chip is connected with a first isolating optocoupler U1, and the first isolating optocoupler U1 is connected with the color mixing circuit; the PWM control circuit is connected with the switch circuit; the second control chip is connected with a second isolation optocoupler U2, and the second isolation optocoupler U2 is connected with the PWM control circuit; and the third rectifying and filtering circuit is connected with the isolation transformer and the first control chip and the second control chip respectively. PWM control circuit and mixing of colors circuit can adjust luminance the mixing of colors to the LED lamp, still keeps apart commercial power part and control part through isolation transformer, first isolation opto-coupler U1 and second isolation opto-coupler U2, is favorable to improving the security of circuit and driver.
Description
Technical Field
The utility model relates to a lamps and lanterns lighting technology field, in particular to keep apart to adjust luminance mixing of colors LED drive circuit and driver.
Background
The LED lamp is used as a novel light source, has the characteristics of energy conservation, environmental protection and high efficiency, and is widely applied to various illumination fields at present. With the development of the technology, the LED lamp with a lighting function alone cannot meet the lighting requirements of various scenes, and therefore, a dimming driver needs to be connected to the LED lamp.
The dimming driver comprises a power circuit and a control circuit, in the existing dimming driver, the power circuit is directly connected with the control circuit, when the dimming driver is connected with a plurality of LED lamps and the individual LED lamps break down, all circuits of the dimming driver can be influenced, and due to the direct connection of the power circuit and the control circuit, the non-isolated insulation strength of the control circuit is low, and the safety is low. In addition, the control circuit is connected with the light-adjusting switch, so that the potential safety hazard of electric shock accidents exists.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an keep apart to adjust luminance mixing of colors LED drive circuit and driver can adjust luminance the mixing of colors and have the electrical isolation function to the LED lamp, is favorable to the security of improving circuit and driver.
In a first aspect, an isolation dimming color-mixing LED driving circuit according to the embodiment of the present invention comprises a first rectifying and filtering circuit; the input end of the switch circuit is connected with the first rectifying and filtering circuit; the isolation transformer is provided with at least two secondary coils, and a primary coil of the isolation transformer is connected with the output end of the switching circuit; the input end of the second rectifying and filtering circuit is connected with the first secondary coil of the isolation transformer; the input end of the color matching circuit is connected with the output end of the second rectifying and filtering circuit, and the output end of the color matching circuit is used for being connected with the LED lamp; the first control chip is connected with a first isolation optocoupler U1 and is connected with the control end of the color mixing circuit through the first isolation optocoupler U1, and the input end of the first control chip is used for receiving a color mixing signal through a switch; the output end of the PWM control circuit is connected with the control end of the switch circuit; the second control chip is connected with a second isolation optocoupler U2 and is connected with the input end of the PWM control circuit through the second isolation optocoupler U2, and the input end of the second control chip is used for receiving dimming signals; and the input end of the third rectifying and filtering circuit is connected with the second secondary coil of the isolation transformer, and the output end of the third rectifying and filtering circuit is respectively connected with the power ends of the first control chip and the second control chip.
According to the utility model discloses a some embodiments, mixing of colors circuit includes first color temperature regulating circuit, second color temperature regulating circuit and PWM regulating circuit, first color temperature regulating circuit's input with first color temperature regulating circuit's input respectively with second rectification filter circuit's output is connected, first color temperature regulating circuit's control end with second color temperature regulating circuit's control end respectively with PWM regulating circuit connects, and passes through PWM regulating circuit with first isolation opto-coupler U1 connects.
According to some embodiments of the present invention, the first color temperature adjusting circuit includes a MOS transistor Q3, a resistor R43, a resistor R50, a resistor R52, a resistor R53, a diode D11, and a diode D14, a first end of the resistor R43 is connected to the positive output terminal of the second rectifying and filtering circuit, a second end of the resistor R43 is connected to the first end of the resistor R50 and the first end of the resistor R52, a second end of the resistor R50 is connected to the gate of the MOS transistor Q3 and the first end of the resistor R53, a second end of the resistor R52, a second end of the resistor R53, and a source of the MOS transistor Q3 are connected to the negative output terminal of the second rectifying and filtering circuit, a positive electrode of the diode D14 is connected to the second end of the resistor R50, a negative electrode of the diode D14 is connected to the first end of the resistor R50, a drain of the MOS transistor Q3 is connected to the positive electrode of the diode D11, the cathode of the diode D11 is connected to the positive output terminal of the second rectifying and filtering circuit, and the drain of the MOS transistor Q3 is further configured to output a first color-adjusting signal.
According to some embodiments of the present invention, the second color temperature adjusting circuit includes a MOS transistor Q4, a resistor R44, a resistor R51, a resistor R54, a resistor R55, a diode D12, and a diode D15, a first end of the resistor R44 is connected to the positive output terminal of the second rectifying and filtering circuit, a second end of the resistor R44 is connected to the first end of the resistor R51 and the first end of the resistor R54, a second end of the resistor R51 is connected to the gate of the MOS transistor Q4 and the first end of the resistor R55, a second end of the resistor R54, sources of the resistor R55 and the MOS transistor Q4 are connected to the negative output terminal of the second rectifying and filtering circuit, a positive electrode of the diode D15 is connected to the second end of the resistor R51, a positive electrode of the diode D15 is connected to the first end of the resistor R51, a positive electrode of the drain transistor Q4 is connected to the positive electrode of the diode D12, the cathode of the diode D12 is connected to the positive output terminal of the second rectifying and filtering circuit, and the drain of the MOS transistor Q4 is further configured to output a second color-adjusting signal.
According to some embodiments of the present invention, the PWM regulating circuit includes triode Q5 and zener diode D17, triode Q5's base with zener diode D17's positive pole is connected, zener diode D17's negative pole respectively with resistance R43's second end with first isolation opto-coupler U1's collector pin is connected, triode Q5's collector with resistance R44's second end is connected, triode Q5's projecting pole respectively with second rectification filter circuit's negative output end with first isolation opto-coupler U1's projecting pole pin is connected.
According to some embodiments of the utility model, keep apart to adjust luminance mixing of colors LED drive circuit still includes the interface of adjusting luminance, adjust luminance the interface respectively with first control chip's input with second control chip's input is connected, the interface of adjusting luminance is used for receiving PWM control signal, potentiometre control signal or 0-10V control signal.
According to some embodiments of the utility model, first rectification filter circuit still is connected with EMI filter circuit.
In a second aspect, according to the present invention, a dimming driver includes the isolation dimming and color mixing LED driving circuit.
According to the utility model discloses one or more technical scheme have following beneficial effect at least:
the utility model discloses have PWM control circuit and mixing of colors circuit, can adjust luminance to the LED lamp and mix colors, still keep apart opto-coupler U2 through isolation transformer, first isolation opto-coupler U1 and second and keep apart the commercial power part and control part, be favorable to the security of improving circuit and driver.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of an isolation dimming and color mixing LED driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a color-tuning circuit of the isolated dimming color-tuning LED driving circuit shown in fig. 1.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1, the present embodiment discloses an isolated dimming and color-mixing LED driving circuit, which includes a first rectifying and filtering circuit 100, a switching circuit 200, an isolation transformer 300, a second rectifying and filtering circuit 400, a color-mixing circuit 500, a first control chip 610, a PWM control circuit 700, a second control chip 620 and a third rectifying and filtering circuit 800, wherein an input end of the switching circuit 200 is connected to the first rectifying and filtering circuit 100, the isolation transformer 300 has at least two sub-coils, the main coil of the isolation transformer 300 is connected to an output end of the switching circuit 200, an input end of the second rectifying and filtering circuit 400 is connected to a first sub-coil of the isolation transformer 300, an input end of the color-mixing circuit 500 is connected to an output end of the second rectifying and filtering circuit 400, an output end of the color-mixing circuit 500 is used for connecting to an LED lamp, the first control chip 610 is connected to a first isolating optocoupler U1 and connected to a control end of the color-mixing circuit 500, the input end of the first control chip 610 is used for receiving a color-mixing signal through a switch, the output end of the PWM control circuit 700 is connected with the control end of the switch circuit 200, the second control chip 620 is connected with a second isolation optocoupler U2 and is connected with the input end of the PWM control circuit 700 through a second isolation optocoupler U2, the input end of the second control chip 620 is used for receiving a light-mixing signal, the input end of the third rectifying and filtering circuit 800 is connected with a second secondary winding of the isolation transformer 300, and the output end of the third rectifying and filtering circuit 800 is connected with the power ends of the first control chip 610 and the second control chip 620 respectively.
In this embodiment, the first control chip 610 receives the color modulation signal, and can adjust the color temperature of the LED lamp through the color modulation circuit 500, and the second control chip 620 receives the dimming signal, and can adjust the brightness of the LED lamp through the PWM control circuit 700 and the switch circuit 200, wherein the PWM control circuit 700 is a common circuit module in the LED lamp driving circuit, and therefore, the specific structure of the PWM control circuit 700 is not described in detail in this embodiment. First rectification filter circuit 100 is connected with the commercial power, isolation transformer 300, first isolation opto-coupler U1 and second isolation opto-coupler U2 can play the isolation to the commercial power, realize mixing of colors circuit 500, first control chip 610, electrical isolation between second control chip 620 and the commercial power, when using, first control chip 610 and second control chip 620 are connected with dimmer switch, because dimmer switch can frequently use, electrical isolation can reduce human contact dimmer switch's the risk of electrocution, be favorable to improving the security of circuit.
Referring to fig. 2, in order to achieve a better color temperature adjustment effect, the color matching circuit 500 includes a first color temperature adjustment circuit 510, a second color temperature adjustment circuit 520, and a PWM adjustment circuit 530, an input end of the first color temperature adjustment circuit 510 and an input end of the first color temperature adjustment circuit 510 are respectively connected to an output end of the second rectification filter circuit 400, a control end of the first color temperature adjustment circuit 510 and a control end of the second color temperature adjustment circuit 520 are respectively connected to the PWM adjustment circuit 530, and are connected to the first isolation optocoupler U1 through the PWM adjustment circuit 530, wherein output ends of the first color temperature adjustment circuit 510 and the second color temperature adjustment circuit 520 are respectively connected to a warm color LED lamp and a cold color LED lamp. The PWM toning signal generated by the first control chip 610 is transmitted to the PWM adjusting circuit 530 through the second isolating optocoupler U2, and the first color temperature adjusting circuit 510 and the second color temperature adjusting circuit 520 are controlled to be turned on or off, respectively, thereby achieving the toning function.
Referring to fig. 2, the first color temperature adjustment circuit 510 includes a MOS transistor Q3, a resistor R43, a resistor R50, a resistor R52, a resistor R53, a diode D11, and a diode D14, a first end of the resistor R43 is connected to the positive output terminal of the second rectification filter circuit 400, a second end of the resistor R43 is connected to the first end of the resistor R50 and the first end of the resistor R52, a second end of the resistor R50 is connected to the gate of the MOS transistor Q3 and the first end of the resistor R53, a second end of the resistor R52, a second end of the resistor R53, and a source of the MOS transistor Q3 are connected to the negative output terminal of the second rectification filter circuit 400, a positive electrode of the diode D14 is connected to the second end of the resistor R50, a negative electrode of the diode D14 is connected to the first end of the resistor R50, the diode D14 serves as a free-wheeling function, the MOS transistor Q14 can be protected, which is favorable for improving reliability of the MOS transistor Q14, a positive electrode of the diode Q14 is connected to the positive electrode of the second rectification filter circuit 36, the drain of the MOS transistor Q3 is also used for outputting the first toning signal.
The second color temperature adjusting circuit 520 comprises a MOS transistor Q4, a resistor R44, a resistor R51, a resistor R54, a resistor R55, a diode D12 and a diode D15, a first end of the resistor R44 is connected with a positive output end of the second rectifying and filtering circuit 400, a second end of the resistor R44 is respectively connected with a first end of a resistor R51 and a first end of a resistor R54, a second end of the resistor R51 is respectively connected with a gate of the MOS transistor Q4 and a first end of a resistor R55, a second end of the resistor R54, a resistor R55 and a source of the MOS transistor Q4 are respectively connected with a negative output end of the second rectifying and filtering circuit 400, an anode of the diode D15 is connected with a second end of the resistor R51, an anode of the diode D15 is connected with a first end of the resistor R51, a drain of the MOS transistor Q4 is connected with an anode of the diode D12, a diode D15 plays a role in freewheeling, can protect the MOS transistor Q4, and is beneficial for improving reliability of the diode Q12 and is connected with the positive output end of the second, the drain of the MOS transistor Q4 is also used for outputting the second toning signal.
The PWM regulating circuit 530 includes a transistor Q5 and a zener diode D17, a base of the transistor Q5 is connected to an anode of the zener diode D17, a cathode of the zener diode D17 is connected to a second end of the resistor R43 and a collector pin of the first isolating optocoupler U1, a collector of the transistor Q5 is connected to a second end of the resistor R44, and an emitter of the transistor Q5 is connected to a negative output terminal of the second rectifying and filtering circuit 400 and an emitter pin of the first isolating optocoupler U1. The PWM adjusting circuit 530 receives the PWM color mixing signal from the first control chip 610, and controls the MOS transistor Q3 and the MOS transistor Q4 to be turned on and off respectively by controlling the on and off of the transistor Q5, so as to implement the operation of the warm color LED lamp and the operation of the cold color LED lamp, or mix the colors of the warm color LED lamp and the cold color LED lamp, thereby implementing the color mixing function.
The LED driving circuit further comprises a dimming interface, the dimming interface is respectively connected with the input end of the first control chip 610 and the input end of the second control chip 620, the dimming interface is used for receiving PWM control signals, potentiometer control signals or 0-10V control signals, the dimming interface can receive three different control signals, and requirements of different users or terminals on dimming power supplies can be met.
Referring to fig. 1, in order to improve the safety and reliability of the circuit, the first rectifying and filtering circuit 100 is further connected to an EMI filtering circuit 900, and the EMI filtering circuit 900 can perform EMI protection, which is beneficial to improving the anti-interference capability of the circuit.
The embodiment of the utility model provides a still disclose a driver of adjusting luminance, adjust luminance mixing of colors LED drive circuit including foretell isolation. Keep apart to adjust luminance mixing of colors LED drive circuit has PWM control circuit 700 and mixing of colors circuit 500, can adjust luminance the mixing of colors to the LED lamp, still keeps apart mains supply part and control part through isolation transformer 300, first isolation opto-coupler U1 and second isolation opto-coupler U2, is favorable to improving the security of circuit and driver.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (8)
1. An isolated dimming and color-mixing LED driving circuit is characterized by comprising:
a first rectifying-filtering circuit (100);
the input end of the switching circuit (200) is connected with the first rectifying and filtering circuit (100);
an isolation transformer (300) having at least two secondary windings, the primary winding of the isolation transformer (300) being connected to the output of the switching circuit (200);
a second rectifying and filtering circuit (400), the input end of which is connected with the first secondary coil of the isolation transformer (300);
the input end of the color matching circuit (500) is connected with the output end of the second rectifying and filtering circuit (400), and the output end of the color matching circuit (500) is used for being connected with an LED lamp;
the first control chip (610) is connected with a first isolation optocoupler U1 and is connected with the control end of the color mixing circuit (500) through the first isolation optocoupler U1, and the input end of the first control chip (610) is used for receiving a color mixing signal through a switch;
the output end of the PWM control circuit (700) is connected with the control end of the switch circuit (200);
the second control chip (620) is connected with a second isolation optocoupler U2 and is connected with the input end of the PWM control circuit (700) through the second isolation optocoupler U2, and the input end of the second control chip (620) is used for receiving a dimming signal;
and the input end of the third rectifying and filtering circuit (800) is connected with the second secondary winding of the isolation transformer (300), and the output end of the third rectifying and filtering circuit (800) is respectively connected with the power ends of the first control chip (610) and the second control chip (620).
2. The isolated dimming and color mixing LED driving circuit according to claim 1, wherein the color mixing circuit (500) comprises a first color temperature adjusting circuit (510), a second color temperature adjusting circuit (520) and a PWM adjusting circuit (530), an input end of the first color temperature adjusting circuit (510) and an input end of the first color temperature adjusting circuit (510) are respectively connected with an output end of the second rectifying and filtering circuit (400), a control end of the first color temperature adjusting circuit (510) and a control end of the second color temperature adjusting circuit (520) are respectively connected with the PWM adjusting circuit (530), and are connected with the first isolating optocoupler U1 through the PWM adjusting circuit (530).
3. The isolated dimming and toning LED driving circuit according to claim 2, wherein the first toning temperature adjusting circuit (510) comprises a MOS tube Q3, a resistor R43, a resistor R50, a resistor R52, a resistor R53, a diode D11 and a diode D14, a first end of the resistor R43 is connected with a positive output end of the second rectifying and filtering circuit (400), a second end of the resistor R43 is respectively connected with a first end of the resistor R50 and a first end of the resistor R52, a second end of the resistor R50 is respectively connected with a gate of the MOS tube Q3 and a first end of the resistor R53, a second end of the resistor R52, a second end of the resistor R53 and a source of the MOS tube Q3 are connected with a negative output end of the second rectifying and filtering circuit (400), a positive electrode of the diode D14 is connected with a second end of the resistor R50, a negative electrode of the diode D14 is connected with a first end of the resistor R50, the drain of the MOS transistor Q3 is connected to the anode of the diode D11, the cathode of the diode D11 is connected to the positive output terminal of the second rectifying and filtering circuit (400), and the drain of the MOS transistor Q3 is further configured to output a first color-adjusting signal.
4. The isolated dimming and color-mixing LED driving circuit according to claim 3, wherein the second color temperature adjusting circuit (520) comprises a MOS tube Q4, a resistor R44, a resistor R51, a resistor R54, a resistor R55, a diode D12 and a diode D15, a first end of the resistor R44 is connected to a positive output end of the second rectifying and filtering circuit (400), a second end of the resistor R44 is respectively connected to a first end of the resistor R51 and a first end of the resistor R54, a second end of the resistor R51 is respectively connected to a gate of the MOS tube Q4 and a first end of the resistor R55, a second end of the resistor R54, a source of the resistor R55 and a source of the MOS tube Q4 are respectively connected to a negative output end of the second rectifying and filtering circuit (400), a positive electrode of the diode D15 is connected to a second end of the resistor R51, a positive electrode of the diode D15 is connected to a first end of the resistor R51, the drain of the MOS transistor Q4 is connected to the anode of the diode D12, the cathode of the diode D12 is connected to the positive output terminal of the second rectifying and filtering circuit (400), and the drain of the MOS transistor Q4 is further configured to output a second color matching signal.
5. The isolated dimming and toning LED driving circuit according to claim 4, wherein the PWM adjusting circuit (530) comprises a transistor Q5 and a zener diode D17, a base of the transistor Q5 is connected with an anode of the zener diode D17, a cathode of the zener diode D17 is connected with a second end of the resistor R43 and a collector pin of the first isolating optocoupler U1 respectively, a collector of the transistor Q5 is connected with a second end of the resistor R44, and an emitter of the transistor Q5 is connected with a negative output end of the second rectifying and filtering circuit (400) and an emitter pin of the first isolating optocoupler U1 respectively.
6. The isolated dimming and toning LED driving circuit according to claim 1, further comprising a dimming interface connected to an input terminal of the first control chip (610) and an input terminal of the second control chip (620), respectively, the dimming interface being configured to receive a PWM control signal, a potentiometer control signal, or a 0-10V control signal.
7. The isolated dimming and toning LED driving circuit according to claim 1, wherein the first rectifying and filtering circuit (100) is further connected with an EMI filtering circuit (900).
8. A dimming driver comprising the isolated dimming and toning LED driver circuit of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021512075.5U CN213073181U (en) | 2020-07-27 | 2020-07-27 | Isolation dimming color-mixing LED driving circuit and driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021512075.5U CN213073181U (en) | 2020-07-27 | 2020-07-27 | Isolation dimming color-mixing LED driving circuit and driver |
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| Publication Number | Publication Date |
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| CN213073181U true CN213073181U (en) | 2021-04-27 |
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| CN202021512075.5U Active CN213073181U (en) | 2020-07-27 | 2020-07-27 | Isolation dimming color-mixing LED driving circuit and driver |
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| CN (1) | CN213073181U (en) |
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