CN215734940U - Color temperature adjusting circuit compatible with high-frequency electronic ballast and LED lamp - Google Patents
Color temperature adjusting circuit compatible with high-frequency electronic ballast and LED lamp Download PDFInfo
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- CN215734940U CN215734940U CN202121213947.2U CN202121213947U CN215734940U CN 215734940 U CN215734940 U CN 215734940U CN 202121213947 U CN202121213947 U CN 202121213947U CN 215734940 U CN215734940 U CN 215734940U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to the technical field of lighting, in particular to a color temperature adjusting circuit compatible with a high-frequency electronic ballast and an LED lamp. The color temperature adjusting circuit compatible with the high-frequency electronic ballast comprises a first matching circuit, a second matching circuit, a first rectifying circuit, a second rectifying circuit, a color temperature adjusting circuit, a first load circuit and a second load circuit; after the color temperature adjusting circuit is electrified every time, the first switch end and/or the second switch end are/is conducted, so that the conducting states of the first load circuit and the second load circuit are circularly changed according to the electrifying times of the color temperature adjusting circuit. The color temperature adjusting circuit has the power-on memory function, can adjust the color temperature by powering on the switch for multiple times, avoids the phenomenon of lamp death, and has high reliability because the LED load and the color temperature adjusting circuit are provided with multiple protections to prevent the LED load or the color temperature adjusting circuit from being damaged by unstable input.
Description
Technical Field
The utility model relates to the technical field of lighting, in particular to a color temperature adjusting circuit compatible with a high-frequency electronic ballast and an LED lamp.
Background
The semiconductor Lighting (LED) has the advantages of high lighting effect, long service life, environmental protection and the like, and the potential of replacing the traditional lighting (such as incandescent lamps and fluorescent lamps) is inevitable, however, a large amount of traditional fluorescent lamp lighting still exists at present, and the electronic ballast used by the fluorescent lamp also occupies a large market, because the traditional fluorescent lamp electronic ballast has output instability, the output electric parameters of the traditional fluorescent lamp electronic ballast are inconsistent during no-load, preheating, lighting and stable work, and the voltage difference can reach 2-5 times; when the input voltage of the electronic ballast changes, the output electrical parameter of the electronic ballast will also change.
In view of the above problems, there is a compatible high-frequency electronic ballast LED driving circuit in the market, which performs rectification after voltage reduction by a capacitor, and the rectified LED driving circuit is connected to an LED light source, however, the existing compatible high-frequency electronic ballast LED driving circuit at least has the following drawbacks:
(1) the existing LED driving circuit compatible with the high-frequency electronic ballast basically only has single-path LED or dial color modulation, and needs a dial switch or a multi-section switch when the color modulation or color temperature modulation function is needed, so that the modulation logic is easy to generate disorder, and the production cost is high.
(2) The existing LED driving circuit compatible with the high-frequency electronic ballast is rectified after voltage reduction through a capacitor, and is directly connected with an LED light source after rectification, so that output electric parameters are unstable, no protective measures are taken, and the reliability is poor.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a color temperature adjusting circuit and an LED lamp compatible with a high frequency electronic ballast, so as to solve one or more technical problems in the prior art and provide at least one of the advantages.
In a first aspect, a color temperature adjusting circuit compatible with a high-frequency electronic ballast is provided, which comprises a first matching circuit, a second matching circuit, a first rectifying circuit, a second rectifying circuit, a color temperature adjusting circuit, a first load circuit and a second load circuit, wherein the first load circuit and the second load circuit are respectively connected with at least one group of LED lamp strings;
the first matching circuit comprises a first input node used for being connected with a first output end of the high-frequency electronic ballast and a second input node used for being connected with a second output end of the high-frequency electronic ballast, the second matching circuit comprises a third input node used for being connected with a third output end of the high-frequency electronic ballast and a fourth input node used for being connected with a fourth output end of the high-frequency electronic ballast, the output end of the first matching circuit is connected with the input end of the first rectifying circuit, the output end of the second matching circuit is connected with the input end of the second rectifying circuit, the positive electrode of the output end of the first rectifying circuit is respectively connected with the positive electrode end of the first load circuit and the positive electrode end of the second load circuit, and the positive electrode of the output end of the second rectifying circuit is respectively connected with the positive electrode end of the first load circuit and the positive electrode end of the second load circuit;
the color temperature adjusting circuit is provided with a power supply end, a detection end, a first switch end and a second switch end, the power supply end of the color temperature adjusting circuit is respectively connected with the positive end of the first load circuit and the positive end of the second load circuit, the detection end of the color temperature adjusting circuit is connected with the output end of the first matching circuit, the first switch end of the color temperature adjusting circuit is connected with the negative end of the first load circuit, and the second switch end of the color temperature adjusting circuit is connected with the negative end of the second load circuit;
after the color temperature adjusting circuit is electrified every time, the first switch end and/or the second switch end are/is conducted, so that the conducting states of the first load circuit and the second load circuit are circularly changed according to the electrifying times of the color temperature adjusting circuit.
Further, the first matching circuit further comprises a first matching resistor and a first matching capacitor; the first matching resistor and the first matching capacitor are respectively connected in parallel between the first input node and the second input node, the output end of the first matching circuit is connected with the current-limiting capacitor, and the first matching circuit is connected with the first rectifying circuit through the current-limiting capacitor;
the second matching circuit further comprises a second matching resistor and a second matching capacitor; the second matching resistor and the second matching capacitor are respectively connected in parallel between the third input node and the fourth input node.
Further, the first rectifying circuit includes a first diode and a second diode; the cathode of the first diode is respectively connected with the anode of the output end of the first rectifying circuit and the anode of the output end of the second rectifying circuit, the anode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is grounded;
the second rectifying circuit comprises a third diode and a fourth diode; the cathode of the third diode is respectively connected with the anode of the output end of the first rectifying circuit and the anode of the output end of the second rectifying circuit, the anode of the third diode is connected with the cathode of the fourth diode, and the anode of the fourth diode is grounded;
the color temperature adjusting circuit compatible with the high-frequency electronic ballast further comprises an input filter capacitor, and the input filter capacitor is connected with the first rectifying circuit in parallel.
Further, the color temperature adjusting circuit comprises an adjusting chip, a current limiting circuit and a detection circuit, wherein the adjusting chip is provided with a power supply end, a detection end, a first switch end and a second switch end; the input end of the current limiting circuit is respectively connected with the positive electrode of the output end of the first rectifying circuit and the positive electrode of the output end of the second rectifying circuit, the output end of the current limiting circuit is connected with the power end of the adjusting chip, the input end of the detection circuit is connected with the positive electrode of the output end of the first matching circuit, the output end of the detection circuit is connected with the detection end of the adjusting chip, the first switch end of the adjusting chip is connected with the negative end of the first load circuit, and the second switch end of the adjusting chip is connected with the negative end of the second load circuit.
Further, the adjusting chip is a core flying ice S4225 series switch chip.
Further, the current limiting circuit comprises a current limiting resistor, a fifth diode and a first voltage stabilizing diode; the output signal of the first rectifying circuit and the output signal of the second rectifying circuit flow to the power supply end of the regulating chip through the current-limiting resistor, the cathode of the fifth diode and the cathode of the first voltage-stabilizing diode are respectively connected with the power supply end of the regulating chip, and the anode of the fifth diode and the anode of the first voltage-stabilizing diode are respectively grounded.
Further, the detection circuit comprises a detection resistor, a pull-down resistor, a protection capacitor, a sixth diode and a second voltage stabilizing diode; the output signal of the first matching circuit flows to the detection end of the adjusting chip through the detection resistor, the pull-down resistor is used for pulling down the level signal of the detection end of the adjusting chip, one end of the protection capacitor, the cathode of the sixth diode and the cathode of the second voltage stabilizing diode are respectively connected with the detection end of the adjusting chip, and the other end of the protection capacitor, the anode of the sixth diode and the anode of the second voltage stabilizing diode are respectively grounded.
Furthermore, the color temperature adjusting circuit also comprises a memory circuit, and the memory circuit comprises a memory capacitor and a seventh diode; one end of the memory capacitor and the cathode of the seventh diode are respectively connected with the memory end of the adjusting chip, and the other end of the memory capacitor and the anode of the seventh diode are respectively grounded.
Furthermore, the color temperature adjusting circuit compatible with the high-frequency electronic ballast also comprises a protection circuit, wherein the protection circuit comprises a first transient diode and a second transient diode; the cathode of the first transient diode is connected with the positive end of the first load circuit, the anode of the first transient diode is connected with the negative end of the first load circuit, the cathode of the second transient diode is connected with the positive end of the second load circuit, and the anode of the second transient diode is connected with the negative end of the second load circuit.
In a second aspect, an LED lamp is provided, which includes the color temperature adjusting circuit compatible with the high-frequency electronic ballast of the first aspect.
The utility model has the beneficial effects that:
(1) the color temperature adjusting circuit has a power-on memory function, can adjust the color temperature by powering on the switch for multiple times without setting a dial switch or a multi-section switch, and avoids the phenomenon of lamp death in the process of dial debugging electrification;
(2) the LED load and the color temperature adjusting circuit are protected at multiple positions, the LED load or the color temperature adjusting circuit is prevented from being damaged due to unstable output of the high-frequency electronic ballast, and the reliability is high.
Drawings
Fig. 1 is a block diagram of a color temperature adjusting circuit compatible with a high-frequency electronic ballast according to the present invention.
Fig. 2 is a schematic circuit diagram of a color temperature adjusting circuit compatible with a high frequency electronic ballast according to an exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention will be further described with reference to the embodiments and the accompanying drawings.
According to a first aspect of the present invention, a color temperature adjusting circuit compatible with a high frequency electronic ballast is provided.
Fig. 1 is a block diagram of a color temperature adjusting circuit compatible with a high-frequency electronic ballast according to the present invention.
Referring to fig. 1, the color temperature adjusting circuit compatible with the high-frequency electronic ballast includes a first matching circuit 100, a second matching circuit 200, a first rectifying circuit 300, a second rectifying circuit 400, a color temperature adjusting circuit 500, a first load circuit 600 and a second load circuit 700, wherein the first load circuit 600 and the second load circuit 700 are respectively connected to at least one group of LED lamp strings.
The first matching circuit 100 includes a first input node a1 for connecting a first output terminal of the high frequency electronic ballast and a second input node a2 for connecting a second output terminal of the high frequency electronic ballast, and the second matching circuit 200 includes a third input node A3 for connecting a third output terminal of the high frequency electronic ballast and a fourth input node a4 for connecting a fourth output terminal of the high frequency electronic ballast. The first matching circuit 100 and the second matching circuit 200 are used for matching the ac voltage outputted from the high frequency electronic ballast, which is equivalent to the filament of a fluorescent lamp.
The output end of the first matching circuit 100 is connected with the input end of the first rectifying circuit 300, the output end of the second matching circuit 200 is connected with the input end of the second rectifying circuit 400, and the first matching circuit 100 and the second matching circuit 200 are respectively used for connecting the alternating current output voltage or the alternating current commercial power of the high-frequency electronic ballast and providing direct current voltage.
In actual use, at least one LED string is connected between the positive LED1+ of the first load circuit 600 and the negative LED 1-of the first load circuit 600, and at least one LED string is connected between the positive LED2+ of the second load circuit 700 and the negative LED 2-of the second load circuit 700. In this embodiment, a set of LED strings is connected between the positive LED1+ of the first load circuit 600 and the negative LED 1-of the first load circuit 600, and between the positive LED2+ of the second load circuit 700 and the negative LED 2-of the second load circuit 700, respectively.
The positive electrode of the output end of the first rectifying circuit 300 is connected to the positive electrode LED1+ of the first load circuit 600 and the positive electrode LED2+ of the second load circuit 700, the negative electrode of the output end of the second rectifying circuit 400 is connected to the positive electrode LED1+ of the first load circuit 600 and the positive electrode LED2+ of the second load circuit 700, the first rectifying circuit 300 is configured to convert the output voltage of the first rectifying circuit 300 into a dc voltage suitable for the LEDs, and the second rectifying circuit 400 is configured to convert the output voltage of the second rectifying circuit 400 into a dc voltage suitable for the LEDs.
The color temperature adjusting circuit 500 has a power supply terminal VCC, a detection terminal DET, a first switch terminal K1 and a second switch terminal K2; a power supply terminal VCC of the color temperature adjusting circuit 500 is respectively connected with the positive electrode of the output terminal of the first rectifying circuit 300 and the negative electrode of the output terminal of the second rectifying circuit 400, and the first rectifying circuit 300 and the second rectifying circuit 400 power on the color temperature adjusting circuit 500; the detection terminal DET of the color temperature adjustment circuit 500 is connected to the output terminal of the first matching circuit 100, and an electrical signal flowing to the detection terminal DET of the first matching circuit 100 is used as a color temperature switching signal; the first switch end K1 of the color temperature adjusting circuit 500 is connected with the cathode end LED 1-of the first load circuit 600, the second switch end K2 of the color temperature adjusting circuit 500 is connected with the cathode end LED 2-of the second load circuit 700, and the color temperature adjusting circuit 500 controls the on-off of the first switch end K1 and the second switch end K2, so that the on-off of the LED string between the anode end LED1+ of the first load circuit 600 and the cathode end LED 1-of the first load circuit 600 and the LED string between the anode end LED2+ of the second load circuit 700 and the cathode end LED 2-of the second load circuit 700 are controlled.
The color temperature adjusting circuit compatible with the high-frequency electronic ballast provided by the utility model adjusts the color temperature based on the switch, does not need to be manually mixed with color by combining with the dial switch, can avoid the phenomena of lamp death and the like in the process of dial debugging electrification, and has the following specific color temperature adjusting process and principle:
after each power-on of the color temperature adjusting circuit 500, the first switch terminal K1 and/or the second switch terminal K2 are turned on, so that the on-states of the first load circuit 600 and the second load circuit 700 are cyclically changed according to the power-on times of the color temperature adjusting circuit 500.
Illustratively, the color temperature adjusting circuit 500 may be a three-segment adjustment, and adjusting the color temperature during the cyclic adjustment period may be the following process:
the color temperature adjusting circuit 500 is powered on for the first time, and the first switch end K1 is conducted, so that the LED lamp string between the positive end LED1+ of the first load circuit 600 and the negative end LED 1-of the first load circuit 600 is powered on to emit light;
the color temperature adjusting circuit 500 is powered on for the second time, and the second switch end K2 is conducted, so that the LED lamp string between the positive end LED2+ of the second load circuit 700 and the negative end LED 2-of the second load circuit 700 is powered on to emit light;
the color temperature adjusting circuit 500 is powered on for the third time, and the first switch terminal K1 and the second switch terminal K2 are turned on, so that the LED string between the positive terminal LED1+ of the first load circuit 600 and the negative terminal LED 1-of the first load circuit 600 and the LED string between the negative terminal LED 2-of the second load circuit 700 are powered on to emit light at the same time.
The color temperature adjusting circuit 500 can also be a two-stage adjusting circuit, and in the cyclic adjusting period, the color temperature adjusting can be a process as follows:
the color temperature adjusting circuit 500 is powered on for the first time, and the first switch end K1 is conducted, so that the LED lamp string between the positive end LED1+ of the first load circuit 600 and the negative end LED 1-of the first load circuit 600 is powered on to emit light;
the color temperature adjusting circuit 500 is powered on for the second time, and the second switch terminal K2 is turned on, so that the LED light string between the positive terminal LED2+ of the second load circuit 700 and the negative terminal LED 2-of the second load circuit 700 is powered on to emit light.
The first load circuit 600 and the second load circuit 700 are the most basic embodiments, and in practical use, more than two sets of load circuits can be arranged according to the switching performance of the color temperature adjusting circuit 500, so that the light emitting modes in the cycle adjusting period are more diversified.
The structure and principle of the color temperature adjusting circuit compatible with the high-frequency electronic ballast are further explained in the following by combining the specific structure of each circuit.
Fig. 2 is a schematic circuit diagram of a color temperature adjusting circuit compatible with a high frequency electronic ballast according to an exemplary embodiment.
The first matching circuit 100 of the present embodiment includes a first input node a1, a second input node a2, a first matching resistor R1, and a first matching capacitor C1; the first resistor R1, the second resistor R2, the first capacitor C1 and the second capacitor C2 are respectively connected in parallel between the first input node a1 and the second input node a2, the output end of the first matching circuit 100 is connected with the current-limiting capacitor C3, and the first matching circuit 100 is connected with the first rectifying circuit 300 through the current-limiting capacitor C3.
The second matching circuit 200 of the present embodiment includes a third input node A3, a fourth input node a4, a second matching resistor R2, and a second matching capacitor C2; the second matching resistor R2 and the second matching capacitor C2 are connected in parallel between the third input node A3 and the fourth input node a4, respectively.
The first matching resistor R1 and the first matching capacitor C1 in the first matching circuit 100 form a filament impedance matched with the electronic ballast to prevent the instantaneous high voltage of the electronic ballast from damaging the following circuit structure, and similarly, the second matching resistor R2 and the second matching capacitor C2 in the second matching circuit 200 form a filament impedance matched with the electronic ballast; the current limiting capacitor C3 in the first matching circuit 100 is low pass high, filters dc signal interference, and further current limiting and voltage dropping.
In the present embodiment, the first rectification circuit 300 includes a first diode D1 and a second diode D2; the cathode of the first diode D1 is respectively connected with the anode of the output end of the first rectifying circuit 300 and the cathode of the output end of the second rectifying circuit 400, the anode of the first diode D1 is connected with the cathode of the second diode D2, and the anode of the second diode D2 is grounded; the second rectification circuit 400 includes a third diode D3 and a fourth diode D4; the cathode of the third diode D3 is connected to the positive terminal of the output terminal of the first rectifying circuit 300 and the negative terminal of the output terminal of the second rectifying circuit 400, respectively, the anode of the third diode D3 is connected to the cathode of the fourth diode D4, and the anode of the fourth diode D4 is grounded. The first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 form a full-bridge rectification structure, and the alternating current output voltage of the electronic ballast can be completely utilized.
The color temperature adjusting circuit compatible with the high-frequency electronic ballast further includes an input filter capacitor C4 for filtering interference signals in the output signals of the first rectifying circuit 300 and the second rectifying circuit 400, and the input filter capacitor C4 is connected in parallel with the first rectifying circuit 300.
The color temperature adjusting circuit 500 of the present embodiment includes an adjusting chip U1, a current limiting circuit 510, and a detecting circuit 520, wherein the adjusting chip U1 has a power source terminal VCC, a detecting terminal DET, a first switch terminal K1, and a second switch terminal K2; the input end of the current limiting circuit 510 is respectively connected with the positive electrode of the output end of the first rectifying circuit 300 and the negative electrode of the output end of the second rectifying circuit 400, the output end of the current limiting circuit 510 is connected with the power supply end VCC of the adjusting chip U1, the input end of the detecting circuit 520 is connected with the output end of the first matching circuit 100, the output end of the detecting circuit 520 is connected with the detecting end DET of the adjusting chip U1, the first switch end K1 of the adjusting chip U1 is connected with the negative electrode end LED1 of the first load circuit 600, and the second switch end K2 of the adjusting chip U1 is connected with the negative electrode end LED2 of the second load circuit 700.
The adjusting chip U1 described in this embodiment is a core flying slush S4225 series switch chip.
The current limiting circuit 510 according to this embodiment includes a current limiting resistor R3, a fifth diode D5, and a first zener diode ZD 1; the output signal of the first rectifying circuit 300 and the output signal of the second rectifying circuit 400 flow to the power supply terminal VCC of the regulating chip U1 through the current limiting resistor R3, the cathode of the fifth diode D5 and the cathode of the first zener diode ZD1 are connected to the power supply terminal VCC of the regulating chip U1, respectively, and the anode of the fifth diode D5 and the anode of the first zener diode ZD1 are grounded, respectively.
The current limiting resistor R3 steps down the output voltages of the first rectifying circuit 300 and the second rectifying circuit 400 and provides the voltage to the power supply terminal VCC of the regulating chip U1, so that the voltage flowing to the power supply terminal VCC of the regulating chip U1 is maintained at 6.8V; further, the first zener diode ZD1 is reversely connected to the power supply terminal VCC of the adjusting chip U1, so as to stabilize the voltage value of the power supply terminal VCC flowing to the adjusting chip U1, and the fifth diode D5 is reversely connected to the power supply terminal VCC of the adjusting chip U1, so as to prevent the voltage fluctuation of the power supply terminal VCC flowing to the adjusting chip U1 from damaging the adjusting chip U1.
The detection circuit 520 of the present embodiment includes a detection resistor R4, a pull-down resistor R5, a protection capacitor C5, a sixth diode D6, and a second zener diode ZD 2; an output signal of the first matching circuit 100 flows to the detection end DET of the adjusting chip U1 through the detection resistor R4, the pull-down resistor R5 is used for pulling down a level signal of the detection end DET of the adjusting chip U1, one end of the protection capacitor C5, a cathode of the sixth diode D6 and a cathode of the second zener diode ZD2 are respectively connected with the detection end DET of the adjusting chip U1, and the other end of the protection capacitor C5, an anode of the sixth diode D6 and an anode of the second zener diode ZD2 are respectively grounded.
The detection circuit 520 detects whether the first matching circuit 100 is powered on through the detection resistor R4, if the first matching circuit 100 is powered on, a voltage signal is obtained from the output end of the first matching circuit 100 and is sent to the detection end DET of the adjusting chip U1, the pull-down resistor R5 enables the detection end DET of the adjusting chip U1 to keep low level, the second voltage-stabilizing diode ZD2 is used for stabilizing a detection signal flowing to the detection end DET of the adjusting chip U1, and the sixth diode D6 is used for preventing surge overvoltage from damaging the adjusting chip U1.
In the present embodiment, the color temperature adjusting circuit 500 further includes a memory circuit 530, the memory circuit 530 includes a memory capacitor C6 and a seventh diode D7; one end of the memory capacitor C6 and the cathode of the seventh diode D7 are respectively connected with the memory end of the adjusting chip U1, and the other end of the memory capacitor C6 and the anode of the seventh diode D7 are respectively grounded.
The memory circuit 530 is used for realizing the power-off memory function of the regulating chip U1, the power-off memory time can be set according to the capacitance value of the memory capacitor C6, and the seventh diode D7 is used for preventing surge overvoltage from damaging the regulating chip U1.
The color temperature adjusting circuit compatible with the high-frequency electronic ballast further includes a protection circuit 800, where the protection circuit 800 includes a first transient diode TVS1 and a second transient diode TVS 2; the cathode of the first transient diode TVS1 is connected to the positive terminal LED1+ of the first load circuit 600, the anode of the first transient diode TVS1 is connected to the negative terminal LED 1-of the first load circuit 600, the cathode of the second transient diode TVS2 is connected to the positive terminal LED2+ of the second load circuit 700, and the anode of the second transient diode TVS2 is connected to the negative terminal LED 2-of the second load circuit 700.
The first transient diode TVS1 and the second transient diode TVS2 are connected in reverse parallel to the LED string as a load, respectively, and when a surge of overcurrent and/or overvoltage is input, the first transient diode TVS1 and the second transient diode TVS2 can be rapidly switched from high impedance to low impedance to absorb the surge power of overcurrent and/or overvoltage, so that the voltage between the positive terminal LED1+ of the first load circuit 600 and the negative terminal LED 1-of the first load circuit 600 and the voltage between the positive terminal LED2+ of the second load circuit 700 and the negative terminal LED 2-of the second load circuit 700 are at a stable value.
According to a second aspect of the present invention, an LED lamp is provided, where the LED lamp includes the color temperature adjusting circuit compatible with the high-frequency electronic ballast, and the specific structure of the color temperature adjusting circuit compatible with the high-frequency electronic ballast refers to the above embodiments.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A color temperature adjusting circuit compatible with a high-frequency electronic ballast is characterized by comprising a first matching circuit, a second matching circuit, a first rectifying circuit, a second rectifying circuit, a color temperature adjusting circuit, a first load circuit and a second load circuit, wherein the first load circuit and the second load circuit are respectively connected with at least one group of LED lamp strings;
the first matching circuit comprises a first input node used for being connected with a first output end of the high-frequency electronic ballast and a second input node used for being connected with a second output end of the high-frequency electronic ballast, the second matching circuit comprises a third input node used for being connected with a third output end of the high-frequency electronic ballast and a fourth input node used for being connected with a fourth output end of the high-frequency electronic ballast, the output end of the first matching circuit is connected with the input end of the first rectifying circuit, the output end of the second matching circuit is connected with the input end of the second rectifying circuit, the positive pole of the output end of the first rectifying circuit is respectively connected with the positive pole end of the first load circuit and the positive pole end of the second load circuit, and the positive pole of the output end of the second rectifying circuit is respectively connected with the positive pole end of the first load circuit and the positive pole end of the second load circuit;
the color temperature adjusting circuit is provided with a power supply end, a detection end, a first switch end and a second switch end, the power supply end of the color temperature adjusting circuit is respectively connected with the positive end of the first load circuit and the positive end of the second load circuit, the detection end of the color temperature adjusting circuit is connected with the output end of the first matching circuit, the first switch end of the color temperature adjusting circuit is connected with the negative end of the first load circuit, and the second switch end of the color temperature adjusting circuit is connected with the negative end of the second load circuit;
and after the color temperature adjusting circuit is electrified every time, the first switch end and/or the second switch end are/is conducted, so that the conducting states of the first load circuit and the second load circuit are cyclically changed according to the electrifying times of the color temperature adjusting circuit.
2. The color temperature adjusting circuit compatible with the high-frequency electronic ballast as claimed in claim 1, wherein the first matching circuit further comprises a first matching resistor and a first matching capacitor; the first matching resistor and the first matching capacitor are respectively connected in parallel between a first input node and a second input node, the output end of the first matching circuit is connected with a current-limiting capacitor, and the first matching circuit is connected with a first rectifying circuit through the current-limiting capacitor;
the second matching circuit further comprises a second matching resistor and a second matching capacitor; the second matching resistor and the second matching capacitor are respectively connected in parallel between the third input node and the fourth input node.
3. The color temperature adjusting circuit compatible with high-frequency electronic ballast as claimed in claim 1, wherein the first rectifying circuit comprises a first diode and a second diode; the cathode of the first diode is respectively connected with the anode of the output end of the first rectifying circuit and the anode of the output end of the second rectifying circuit, the anode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is grounded;
the second rectifying circuit comprises a third diode and a fourth diode; the cathode of the third diode is respectively connected with the anode of the output end of the first rectifying circuit and the anode of the output end of the second rectifying circuit, the anode of the third diode is connected with the cathode of the fourth diode, and the anode of the fourth diode is grounded;
the color temperature adjusting circuit compatible with the high-frequency electronic ballast further comprises an input filter capacitor, and the input filter capacitor is connected with the first rectifying circuit in parallel.
4. The color temperature adjusting circuit compatible with the high-frequency electronic ballast as claimed in claim 1, wherein the color temperature adjusting circuit comprises an adjusting chip, a current limiting circuit, a detecting circuit, the adjusting chip having a power supply terminal, a detecting terminal, a first switch terminal and a second switch terminal; the input end of the current limiting circuit is respectively connected with the positive electrode of the output end of the first rectifying circuit and the positive electrode of the output end of the second rectifying circuit, the output end of the current limiting circuit is connected with the power end of the adjusting chip, the input end of the detection circuit is connected with the positive electrode of the output end of the first matching circuit, the output end of the detection circuit is connected with the detection end of the adjusting chip, the first switch end of the adjusting chip is connected with the negative end of the first load circuit, and the second switch end of the adjusting chip is connected with the negative end of the second load circuit.
5. The color temperature adjusting circuit compatible with the high-frequency electronic ballast as claimed in claim 4, wherein the adjusting chip is a core flying S4225 series switch chip.
6. The color temperature adjusting circuit compatible with the high-frequency electronic ballast as claimed in claim 5, wherein the current limiting circuit comprises a current limiting resistor, a fifth diode and a first voltage stabilizing diode; the output signal of the first rectifying circuit and the output signal of the second rectifying circuit flow to the power supply end of the regulating chip through the current-limiting resistor, the cathode of the fifth diode and the cathode of the first voltage-stabilizing diode are respectively connected with the power supply end of the regulating chip, and the anode of the fifth diode and the anode of the first voltage-stabilizing diode are respectively grounded.
7. The color temperature adjusting circuit compatible with the high-frequency electronic ballast as claimed in claim 5, wherein the detection circuit comprises a detection resistor, a pull-down resistor, a protection capacitor, a sixth diode and a second voltage regulator diode; the output signal of the first matching circuit flows to the detection end of the adjusting chip through the detection resistor, the pull-down resistor is used for pulling down the level signal of the detection end of the adjusting chip, one end of the protection capacitor, the cathode of the sixth diode and the cathode of the second voltage stabilizing diode are respectively connected with the detection end of the adjusting chip, and the other end of the protection capacitor, the anode of the sixth diode and the anode of the second voltage stabilizing diode are respectively grounded.
8. The color temperature adjusting circuit compatible with the high-frequency electronic ballast as claimed in claim 5, further comprising a memory circuit, wherein the memory circuit comprises a memory capacitor and a seventh diode; one end of the memory capacitor and the cathode of the seventh diode are respectively connected with the memory end of the adjusting chip, and the other end of the memory capacitor and the anode of the seventh diode are respectively grounded.
9. The color temperature adjusting circuit compatible with the high-frequency electronic ballast as claimed in claim 1, wherein the color temperature adjusting circuit compatible with the high-frequency electronic ballast further comprises a protection circuit, the protection circuit comprises a first transient diode and a second transient diode; the cathode of the first transient diode is connected with the positive end of the first load circuit, the anode of the first transient diode is connected with the negative end of the first load circuit, the cathode of the second transient diode is connected with the positive end of the second load circuit, and the anode of the second transient diode is connected with the negative end of the second load circuit.
10. An LED lamp comprising the color temperature adjusting circuit compatible with the high frequency electronic ballast as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121213947.2U CN215734940U (en) | 2021-06-01 | 2021-06-01 | Color temperature adjusting circuit compatible with high-frequency electronic ballast and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121213947.2U CN215734940U (en) | 2021-06-01 | 2021-06-01 | Color temperature adjusting circuit compatible with high-frequency electronic ballast and LED lamp |
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| Publication Number | Publication Date |
|---|---|
| CN215734940U true CN215734940U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121213947.2U Active CN215734940U (en) | 2021-06-01 | 2021-06-01 | Color temperature adjusting circuit compatible with high-frequency electronic ballast and LED lamp |
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| Country | Link |
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| CN (1) | CN215734940U (en) |
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2021
- 2021-06-01 CN CN202121213947.2U patent/CN215734940U/en active Active
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