CN210093612U - LED double-color dimming built-in power supply - Google Patents
LED double-color dimming built-in power supply Download PDFInfo
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- CN210093612U CN210093612U CN201920320588.7U CN201920320588U CN210093612U CN 210093612 U CN210093612 U CN 210093612U CN 201920320588 U CN201920320588 U CN 201920320588U CN 210093612 U CN210093612 U CN 210093612U
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Abstract
The utility model discloses a LED double-color dimming built-in power supply, wherein, the LED double-color dimming built-in power supply comprises an AC-DC circuit, two DC-DC circuits and a WIFI module; the output end of the AC-DC circuit is connected with the power input end of the WIFI module and the power input ends of the two DC-DC circuits respectively, and the PWM signal input ends of the two DC-DC circuits are connected with the output end of the WIFI module; the power output ends of the two DC-DC circuits are respectively connected with one LED lamp; the AC-DC circuit is used for converting an input alternating current power supply into a first direct current power supply to be output so as to supply power to the WiFi module; the WiFi module is used for converting the received dimming signal transmitted by the wireless terminal into a PWM signal to be output after being electrified and driving the two DC-DC circuits to work; and the two-way DC-DC circuit is used for correspondingly converting the first direct current power supply into two direct current power supplies when in work so as to drive the two-way LED lamp to work. The utility model discloses technical scheme has realized that LED double-colored internal power source's of adjusting luminance double-colored no stroboscopic output.
Description
Technical Field
The utility model relates to an internal power supply technical field, in particular to double-colored internal power supply that adjusts luminance of LED.
Background
With the continuous development of the switching power supply technology, the miniaturization, high quality and low cost of the power supply become an industry trend. The built-in power supply in the market at present has low power factor and stroboscopic problem, especially for the built-in power supply for dimming. Stroboscopic is the variation of the intensity or brightness of light over a period of time, and is found in many lighting applications, including slow motion photography on television, tunnel lighting, various areas of general lighting, and workplaces using fast rotating machinery. The stroboflash can affect human health, the influence degree depends on the stroboflash frequency and the sensitivity of individuals to the stroboflash, the stroboflash is particularly serious for lights with different brightness, although the high-frequency stroboflash can not have obvious influence on human bodies, the stroboflash with the low frequency below 120 Hz can easily affect the human health.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a LED double-colored internal power source that adjusts luminance aims at solving the stroboscopic phenomenon of the double-colored output of the LED double-colored internal power source that adjusts luminance.
In order to achieve the above object, the utility model provides a built-in power supply for LED double-color dimming, which comprises an AC-DC circuit, two DC-DC circuits and a WIFI module;
the output end of the AC-DC circuit is connected with the power input end of the WIFI module and the power input ends of the two DC-DC circuits respectively, and the PWM signal input ends of the two DC-DC circuits are connected with the output end of the WIFI module; the power output ends of the two DC-DC circuits are respectively connected with one LED lamp;
the AC-DC circuit is used for converting an input alternating current power supply into a first direct current power supply to be output so as to supply power to the WiFi module;
the WiFi module is used for converting the received dimming signal transmitted by the wireless terminal into a PWM signal to be output after being electrified and driving the two DC-DC circuits to work;
and the two DC-DC circuits are used for correspondingly converting the first direct current power supply into two direct current power supplies when the LED lamp works so as to drive the two LED lamps to work.
Optionally, the AC-DC circuit includes an alternating current input terminal, an EMC filter circuit, a rectifier filter circuit, a PFC circuit, and a transformer isolation conversion circuit, which are connected in sequence;
the EMC filter circuit is used for carrying out EMC filter processing on an input alternating current power supply;
the rectification filter circuit is used for rectifying the alternating current power supply subjected to EMC filtering into a direct current power supply and filtering;
the PFC circuit is used for correcting the power factor of the direct-current power supply obtained after rectification and filtering;
and the transformer isolation conversion circuit is used for outputting the power supply signal after the power factor correction is performed with voltage transformation.
Optionally, the rectification filter circuit includes a rectifier bridge and a first capacitor, and the first capacitor is a CBB capacitor;
the rectifier bridge is used for rectifying the alternating current power supply subjected to EMC filtering into a direct current power supply;
and the first capacitor is used for filtering the direct-current power supply rectified by the rectifier bridge.
Optionally, the transformer isolation conversion circuit includes a flyback converter, a driving switch, a starting circuit and a boost controller, which are connected in sequence;
the starting circuit is used for receiving the direct-current power supply output by the rectifying and filtering circuit and controlling the boost controller to be powered on;
the boost controller is used for outputting a PWM control signal to drive the driving switch to work after being electrified so as to adjust the output voltage of the flyback converter;
and the flyback converter is used for transforming the power supply signal after the power factor correction according to the control of the boost controller and then outputting the transformed power supply signal.
Optionally, the driving switch includes a first MOS transistor, a gate of the first MOS transistor is connected to the output terminal of the boost controller, a source of the first MOS transistor is grounded, and a drain of the first MOS transistor is connected to the lower end of the primary winding of the flyback converter.
Optionally, the starting circuit includes a starting switch, a second capacitor, a first resistor and a second resistor, a first end of the first resistor and a first end of the second resistor are respectively connected to the output end of the rectifying and filtering circuit, a controlled end of the starting switch is connected to a second end of the first resistor, an input end of the starting switch is connected to a second end of the second resistor, and an output end of the starting switch is grounded via the second capacitor; the output end of the starting switch is also connected with the power input end of the boost controller.
Optionally, the DC-DC circuit includes a constant current driving chip, a sixth diode, a seventh diode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a first inductor;
the output end of the PWM signal is respectively connected to the first end of the fourth resistor, the first end of the fifth resistor and the cathode of the sixth diode, the second end of the fourth resistor, the third end of the constant current driving chip, the input end of the power supply, the first end of the sixth resistor, the cathode of the seventh diode and the first end of the sixth capacitor are connected to each other and to the anode of the LED lamp, the second end of the fifth resistor, the first end of the fourth capacitor and the second end of the constant current driving chip are connected, the second end of the fourth capacitor and the anode of the sixth diode are grounded, the second end of the sixth resistor is connected to the first end of the fifth capacitor, the second end of the fifth capacitor, the anode of the seventh diode, the first end of the first inductor and the eighth end of the constant current driving chip are connected to each other, the second end of the first inductor is connected with the first end of the seventh resistor, and the second end of the seventh resistor is connected with the second end of the sixth capacitor and connected to the negative electrode of the LED lamp.
Optionally, the model of the constant current driving chip is QW 2032.
The technical scheme of the utility model adopts the LED double-color dimming built-in power supply AC-DC circuit, two DC-DC circuits and the WIFI module; the output end of the AC-DC circuit is connected with the power input end of the WIFI module and the power input ends of the two DC-DC circuits respectively, and the PWM signal input ends of the two DC-DC circuits are connected with the output end of the WIFI module; the power output ends of the two DC-DC circuits are respectively connected with one LED lamp; the AC-DC circuit is used for converting an input alternating current power supply into a first direct current power supply to be output so as to supply power to the WiFi module; the WiFi module is used for converting the received dimming signal transmitted by the wireless terminal into a PWM signal to be output after being electrified and driving the two DC-DC circuits to work; and the two DC-DC circuits are used for correspondingly converting the first direct current power supply into two direct current power supplies when the LED lamp works so as to drive the two LED lamps to work. The AC-DC circuit respectively sends different signals to the two DC-DC circuits, the first DC-DC circuit is connected to the negative electrode of the LED lamp to control the lamp to be turned on and simultaneously achieves the brightness of the lamp according to the signals output by the AC-DC circuit, the second DC-DC circuit outputs different signals through the AC-DC circuit to achieve the brightness of the lamp, and the DC-DC circuit adjusts the brightness of the lamp light according to the signal instruction sent by the AC-DC circuit, so that the double-color brightness adjustment of the LED lamp is realized; because the average current of the DC-DC circuit to the DC band energy source output in the AC-DC circuit is constant, the output current is not influenced by the LED lamp voltage and inductance parameter change, and the double-color non-stroboscopic output of the LED double-color dimming built-in power supply is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the LED dual-color dimming internal power supply of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of an AC-DC circuit in an LED bi-color dimming built-in power supply;
FIG. 3 is a circuit diagram illustrating an embodiment of a transformer isolation switching circuit in the AC-DC circuit of FIG. 2;
fig. 4 is a circuit diagram of an embodiment of a DC-DC circuit in an LED bi-color dimming built-in power supply.
The reference numbers illustrate:
the realization, the functional characteristics and the feasible points of the utility model are further explained by referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a double-colored internal power source that adjusts luminance of LED, however, the stroboscopic of early fluorescent lamp is a very common problem, and along with the lapse of time, stroboscopic interference has been eliminated at to a great extent to powerful electronic ballast increasingly, lets the people not receive the stroboscopic. Nowadays, LEDs are involved in various fields including general lighting, signal light prompting, etc., and people are faced with the problem of stroboflash again. And the function of LED driving is crucial to realize the light without stroboflash as far as possible. Stroboscopic is the variation of the intensity or brightness of light over a period of time, and is found in many lighting applications, including slow motion photography on television, tunnel lighting, various areas of general lighting, and workplaces using fast rotating machinery. The stroboflash can affect human health, the influence degree depends on the stroboflash frequency and the sensitivity of individuals to the stroboflash, the stroboflash is particularly serious for lights with different brightness, although the high-frequency stroboflash can not have obvious influence on human bodies, the stroboflash with the low frequency below 120 Hz can easily affect the human health.
In order to solve the above problem, in an embodiment of the present invention, as shown in fig. 1, the LED dual-color dimming built-in power supply includes an AC-DC circuit 110, two paths of DC-DC circuits 120, and a WIFI module 140;
the output end of the AC-DC circuit 110 is connected to the power input end of the WIFI module 140 and the power input ends of the two DC-DC circuits 120, respectively, and the PWM signal input ends of the two DC-DC circuits 120 are connected to the output end of the WIFI module 140; the power output ends of the two DC-DC circuits 120 are respectively connected to one LED lamp 130;
the AC-DC circuit 110 is configured to convert an input AC power into a first DC power and output the first DC power to power the WiFi module 140;
the WiFi module 140 is configured to convert a received dimming signal transmitted by the wireless terminal into a PWM signal for output after being powered on, and drive the two DC-DC circuits 120 to operate;
the two paths of DC-DC circuits 120 are configured to correspondingly convert the first direct current power into two paths of direct current power in operation, so as to drive the two paths of LED lamps 130 to operate.
In this embodiment, as shown in fig. 2, the AC-DC circuit 110 includes an AC input end 111, an EMC filter circuit 112, a rectifier filter circuit 113, a PFC circuit 114, and a transformer isolation conversion circuit 115, which are connected in sequence;
the EMC filter circuit 112 is configured to perform EMC filtering processing on the input ac power;
the rectifying and filtering circuit 113 is configured to rectify and filter the alternating current power supply subjected to EMC filtering processing into a direct current power supply;
the PFC circuit 114 is configured to perform power factor correction on the dc power supply obtained after rectification and filtering;
the transformer isolation conversion circuit 115 is used for outputting the power supply signal after the power factor correction is performed with voltage transformation.
In this embodiment, the input end of the AC-DC circuit 110 is connected to the AC input end 111, and it can be understood that the AC-DC circuit 110 is connected to an AC power supply, that is, 220V commercial power; the input end of the AC-DC circuit 110 is the connected 220V commercial power, the AC input end of the AC-DC circuit 110 is connected to the input end of the EMC filter circuit 112, the EMC filter circuit 112 of the AC-DC circuit 110 performs EMC filtering processing on the input 220V AC power, the output end of the EMC filter circuit 112 is connected to the input end of the rectifier filter circuit 113, the EMC filtered AC power is rectified into a DC power and filtered, the output end of the rectifier filter circuit 113 is connected to the input end of the PFC circuit 114, that is, the power factor correction is performed on the rectified DC power, the output end of the PFC circuit 114 is connected to the input end of the transformer isolation conversion circuit 115, and the voltage is transformed and output through the transformer isolation conversion circuit 115.
It is understood that emc (electro Magnetic compatibility) refers to the ability of a device or system to operate satisfactorily in its electromagnetic environment without generating intolerable electromagnetic interference to any device in its environment. Therefore, EMC includes two requirements: on one hand, the electromagnetic interference generated to the environment by the equipment in the normal operation process cannot exceed a certain limit value; another aspect is that the appliance has a degree of immunity to electromagnetic interference present in the environment, i.e., electromagnetic susceptibility. In the embodiment, EMC filtering is performed on the input 220V alternating current power supply, namely, electromagnetic interference of the AC-DC circuit is filtered. Pfc (power Factor correction) is power Factor correction, and the power Factor refers to the relationship between the effective power and the total power consumption (apparent power), i.e., the ratio of the effective power divided by the total power consumption (apparent power). Basically, the power factor can measure the effective utilization degree of the power, and when the power factor value is larger, the power utilization rate is higher. The power factor is a parameter for measuring the power efficiency of the electric equipment, and the low power factor represents the low power efficiency. In this embodiment, in order to improve the power factor of the LED dual-color dimming internal power supply, the power factor correction is adopted to make the output of the internal power supply be effectively utilized.
In this embodiment, the transformer isolation conversion circuit 115 transforms the voltage of the power signal after the power factor correction and outputs the transformed power signal, that is, the transformer isolation conversion circuit 115 is adopted to enable the AC-DC circuit 110 to output different voltages, so as to output the voltages to the two DC-DC circuits 120, then the two DC-DC circuits 120 can be connected to the cathodes of the LED lamps 130, at this time, the LED lamps 130 receive different power output signals, so as to adjust the brightness of the LED dual-color dimming internal power supply, and achieve the dual-color dimming processing.
In the above embodiment, the LED dual-color dimming built-in power supply AC-DC circuit 110, the two-path DC-DC circuit 120 and the WIFI module 140 are adopted; the output end of the AC-DC circuit 110 is connected to the power input end of the WIFI module 140 and the power input ends of the two DC-DC circuits 120, respectively, and the PWM signal input ends of the two DC-DC circuits 120 are connected to the output end of the WIFI module 140; the power output ends of the two DC-DC circuits 120 are respectively connected to one LED lamp 130; the AC-DC circuit 110 is configured to convert an input AC power into a first DC power and output the first DC power to power the WiFi module 140; the WiFi module 140 is configured to convert a received dimming signal transmitted by the wireless terminal into a PWM signal for output after being powered on, and drive the two DC-DC circuits 120 to operate; the two paths of DC-DC circuits 120 are configured to correspondingly convert the first direct current power into two paths of direct current power in operation, so as to drive the two paths of LED lamps 130 to operate. Therefore, the AC-DC circuit 110 respectively sends different signals to the two DC-DC circuits 120, the first DC-DC circuit 110 is connected to the negative electrode of the LED lamp to control the lamp to be turned on and simultaneously achieve the brightness of the lamp according to the signals output by the AC-DC circuit 110, the second DC-DC circuit 120 outputs different signals through the AC-DC circuit 110 to achieve the brightness of the lamp, and the DC-DC circuit 120 adjusts the brightness of the lamp light according to the signal instruction sent by the AC-DC circuit 110, so that the double-color brightness adjustment of the LED lamp 130 is achieved; because of the constant average current of the DC-DC circuit 120 to the DC band energy output in the AC-DC circuit 110, the output current is not affected by the voltage of the LED lamp 130 and the inductance parameter change, and the two-color non-stroboscopic output of the LED two-color dimming built-in power supply is realized.
In an embodiment, as shown in fig. 3, the rectifying and filtering circuit includes a rectifying bridge and a first capacitor C1, and the first capacitor C1 is a CBB capacitor;
the rectifier bridge is used for rectifying the alternating current power supply subjected to EMC filtering into a direct current power supply;
and the first capacitor C1 is used for filtering the direct-current power supply rectified by the rectifier bridge.
In this embodiment, the rectifier bridge includes 4 diodes, so that after the input 220V AC power is filtered to remove some electromagnetic interference from the AC-DC circuit, the rectifier bridge performs rectification, that is, the EMC filtered AC power is rectified into a DC power; it can be understood that the CBB capacitor is a polypropylene capacitor, the capacitance is 10pF-10uF, the rated voltage is 63V-2000V, most of polyphenyl or mica capacitors can be replaced, and the electrolytic capacitor behind a rectifier bridge is replaced, so that the charging time is short, the electric energy can be effectively utilized, and the power factor of the LED dual-color dimming built-in power supply is improved.
In this embodiment, the rectifier bridge includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, a cathode of the first diode D1, a cathode of the second diode D2, and a first end of the first capacitor C1 are connected to each other, an anode of the third diode D3, an anode of the fourth diode D4, and a second end of the first capacitor C1 are connected to each other, an anode of the first diode D1 is connected to a cathode of the fourth diode D4, an anode of the second diode D2 is connected to a cathode of the third diode D3, an anode of the second diode D2 and a cathode of the third diode D3 are connected to an ac power supply anode, and an anode of the first diode D1 and a cathode of the fourth diode D4 are connected to each other.
In an embodiment, as shown in fig. 3, the transformer isolation conversion circuit includes a flyback converter T, a driving switch, a starting circuit, and a boost controller U, which are connected in sequence;
the starting circuit is used for receiving the direct-current power supply output by the rectifying and filtering circuit and controlling the boost controller to be powered on;
the boost controller U is used for outputting a PWM control signal to drive the driving switch to work after being electrified so as to adjust the output voltage of the flyback converter;
and the flyback converter T is used for transforming the voltage of the power supply signal after the power factor correction according to the control of the boost controller U and then outputting the transformed power supply signal.
In this embodiment, the driving switch includes a first MOS transistor Q1, a gate of the first MOS transistor Q1 is connected to the output terminal of the boost controller U, a source of the first MOS transistor Q1 is grounded, and a drain of the first MOS transistor Q1 is connected to a lower end of the primary winding of the flyback converter. It is understood that the lower end of the primary winding of the flyback converter T is the third end of the primary winding of the flyback converter T.
In this embodiment, the starting circuit includes a starting switch Q2, a second capacitor C2, a first resistor R1 and a second resistor R2, a first end of the first resistor R1 and a first end of the second resistor R2 are respectively connected to the output end of the rectifying and filtering circuit, a controlled end of the starting switch Q2 is connected to a second end of the first resistor R1, an input end of the starting switch Q2 is connected to a second end of the second resistor R2, and an output end of the starting switch Q2 is grounded via the second capacitor C2; the output end of the starting switch Q2 is also connected with the power supply input end of the boost controller.
In this embodiment, the transformer isolation conversion circuit further includes a fifth diode D5, a third capacitor C3, and a third resistor R3, an anode of the fifth diode D5 is connected to an upper end of a secondary winding of the flyback converter T, a cathode of the fifth diode D5 is connected to a first end of the third capacitor C3 and a first end of the third resistor R3, and is connected to an anode of an output end of the transformer isolation conversion circuit, and a second end of the third capacitor C3, a second end of the third resistor R3, and a lower end of the secondary winding of the flyback converter T are connected to each other and to a cathode of the output end of the transformer isolation conversion circuit.
In this embodiment, the first MOS transistor Q1 in the driving switch is controlled by a PWM chip in the AC-DC circuit, and a high-frequency square wave signal is generated at both ends of the transformer by closing and conducting, and the transformer transmits the generated square wave signal to the secondary coil in a magnetic field induction manner, and a stable DC power output is obtained at the output end of the transformer isolation conversion circuit by the rectifying and filtering action of the diode and the capacitor. Further, the Vcc pin is quickly started to work through the start switch Q2, the first MOS transistor Q1 conducts the transformer to work after the boost controller U works, so that the transformer isolation conversion circuit works normally, that is, the AC-DC part works normally, it can be understood that, in the closing stage of the first MOS transistor Q1 in the drive switch, the primary winding of the flyback converter T is directly connected to the rectified and filtered input DC power, the current in the primary winding and the magnetic field in the magnetic core of the flyback converter T increase, energy is stored in the magnetic core, the voltage generated in the secondary winding is reversed, so that the fifth diode D5 is in the reverse bias state and cannot be conducted, at this time, the third capacitor C3 provides the voltage and the current to the load, that is, the power is provided to the DC-DC circuit respectively through the control of the boost controller U, and controlling two paths of DC-DC outputs to work, and inputting the DC-DC chips according to PWM signals with different widths so that the output end of the DC-DC outputs to adjust the brightness of each path of LED lamp. In the phase of turning off the first MOS transistor Q1 of the driving switch, the current in the primary winding is 0, and at the same time, the magnetic field in the magnetic core starts to drop, a forward voltage is induced on the secondary winding, at this time, the fifth diode D5 is in a forward bias state, the conducted current flows into the third capacitor C3 and the load, and the energy stored in the magnetic core is transferred to the third capacitor C3 and the load. It can be understood that the boost controller U is a PWM chip in the transformer isolation conversion circuit; the power supply can be supplied to the WIFI module after the AC-DC output is normal, and the circuit of the LED double-color dimming built-in power supply is controlled after the WIFI module works normally so that the LED double-color normal output can be realized.
It should be noted that, here, the power supply is provided to the DC-DC circuit by the control of the PWM chip, and the pulse width modulation of the PWM chip is adopted, so that different voltage values can be output to adjust the output voltage of the flyback converter, so that different voltage values are respectively output to the two DC-DC circuits, and the two DC-DC circuits control and adjust the LED lamp, thereby realizing the brightness control of the WIFI dual-color LED lamp. In this embodiment, after the AC-DC output is normal, the power can be supplied to the WIFI module, so that the WIFI module outputs different PWM signals after working normally, and starts to control two paths of DC-DC outputs to work, so as to control and adjust the LED lamp, and control the brightness of the WIFI dual-color LED lamp, thereby implementing wireless control of the LED dual-color dimming built-in power supply. It is understood that the control through the WIFI module herein can be applied to a tianmao eidolon, Echo, etc., and is not limited herein. According to the embodiment, the power factor of the LED dual-color dimming built-in power supply is improved and harmonic distortion is reduced through rectification filtering and power factor correction of the AC-DC circuit and control of the flyback converter.
In an embodiment, as shown in fig. 4, the DC-DC circuit includes a constant current driving chip, a sixth diode D6, a seventh diode D7, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and a first inductor L1;
the output end of the PWM signal is respectively connected to the first end of the fourth resistor R4, the first end of the fifth resistor R5, and the cathode of the sixth diode D6, the second end of the fourth resistor R4, the third end VIN of the constant current driving chip, the input end VIN + of the power supply, the first end of the sixth resistor R6, the cathode of the seventh diode D7, and the first end of the sixth capacitor C6 are connected to each other and to the anode of the LED lamp, the second end of the fifth resistor R5, the first end of the fourth capacitor C4, and the second end DIM of the constant current driving chip are connected, the second end of the fourth capacitor C4 and the anode of the sixth diode D6 are grounded, the second end of the sixth resistor R6 is connected to the first end of the fifth capacitor C5, the second end of the fifth capacitor C5, the anode of the seventh diode D7, and the anode of the first end of the first inductor L1 are connected to the cathode of the fifth diode D3935, The eighth ends SW of the constant current driving chips are connected with each other, the second end of the first inductor L1 is connected with the first end of the seventh resistor R7, and the second end of the seventh resistor R7 is connected with the second end of the sixth capacitor C6 and is connected to the cathode of the LED lamp.
In this embodiment, as shown in fig. 4, the driving signal output circuit of the DC-DC circuit is connected to the cathode of the LED lamp to generate a constant current to drive the LED lamp particle module. The constant current driving chip is an integrated voltage reduction type constant current LED driver, the model of the constant current driving chip is QW2032, an advanced average current constant current mode is adopted, the constant current driving chip is more accurate and stable than a peak current mode, the problem of rise of critical point current in the peak current mode is solved, and output current is not influenced by changes of voltage and inductance parameters in an LED lamp in the average current mode. The output current of the constant current driving chip can be set through an external resistor, and dimming control can be performed through a pulse width modulation signal of a PWM chip in the AC-DC circuit, wherein the dimming depth of the PWM dimming function is 0-100%; under-voltage protection, over-temperature protection and LED open circuit protection are arranged in the constant current driving chip so as to prevent the chip from being damaged under the condition of abnormal operation. The LED lamp output of the LED double-color dimming built-in power supply is free of stroboflash.
In this embodiment, in the LED dual-color dimming internal power supply, the VIN +/VOU + input terminal of the DC-DC circuit in fig. 4 is connected to Vout + in fig. 3, Vout-in fig. 3 is connected to the ground of the DC-DC circuit in fig. 4, the VIN +/VOU + output terminal of the DC-DC circuit in fig. 4 is connected to the anode of the LED lamp, that is, the DC-DC common anode output, the LED of the DC-DC circuit in fig. 4 is connected to the cathode of the LED lamp, that is, the constant current driving chip QW2032 in the DC-DC circuit controls the driving signal output circuit to output to the cathode of the LED lamp of the LED dual-color dimming internal power supply; the output of the PWM chip in the AC-DC circuit is connected to a PWM power signal port in the DC-DC circuit.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (8)
1. The LED double-color dimming built-in power supply is characterized by comprising an AC-DC circuit, two DC-DC circuits and a WIFI module;
the output end of the AC-DC circuit is connected with the power input end of the WIFI module and the power input ends of the two DC-DC circuits respectively, and the PWM signal input ends of the two DC-DC circuits are connected with the output end of the WIFI module; the power output ends of the two DC-DC circuits are respectively connected with one LED lamp;
the AC-DC circuit is used for converting an input alternating current power supply into a first direct current power supply to be output so as to supply power to the WiFi module;
the WiFi module is used for converting the received dimming signal transmitted by the wireless terminal into a PWM signal to be output after being electrified and driving the two DC-DC circuits to work;
and the two DC-DC circuits are used for converting the first direct-current power supply into two direct-current power supplies during working so as to drive the two LED lamps to work.
2. The LED dual-color dimming built-in power supply as claimed in claim 1, wherein the AC-DC circuit comprises an AC input terminal, an EMC filter circuit, a rectifier filter circuit, a PFC circuit and a transformer isolation conversion circuit which are connected in sequence;
the EMC filter circuit is used for carrying out EMC filter processing on an input alternating current power supply;
the rectification filter circuit is used for rectifying the alternating current power supply subjected to EMC filtering into a direct current power supply and filtering;
the PFC circuit is used for correcting the power factor of the direct-current power supply obtained after rectification and filtering;
and the transformer isolation conversion circuit is used for outputting the power supply signal after the power factor correction is performed with voltage transformation.
3. The LED dual-color dimming built-in power supply according to claim 2, wherein the rectifying and filtering circuit comprises a rectifying bridge and a first capacitor, and the first capacitor is a CBB capacitor;
the rectifier bridge is used for rectifying the alternating current power supply subjected to EMC filtering into a direct current power supply;
and the first capacitor is used for filtering the direct-current power supply rectified by the rectifier bridge.
4. The LED dual-color dimming built-in power supply of claim 2, wherein the transformer isolation conversion circuit comprises a flyback converter, a driving switch, a starting circuit and a boost controller which are connected in sequence;
the starting circuit is used for receiving the direct-current power supply output by the rectifying and filtering circuit and controlling the boost controller to be powered on;
the boost controller is used for outputting a PWM control signal to drive the driving switch to work after being electrified so as to adjust the output voltage of the flyback converter;
and the flyback converter is used for transforming the power supply signal after the power factor correction according to the control of the boost controller and then outputting the transformed power supply signal.
5. The LED dual-color dimming built-in power supply according to claim 4, wherein the driving switch comprises a first MOS transistor, a gate of the first MOS transistor is connected to the output end of the boost controller, a source of the first MOS transistor is grounded, and a drain of the first MOS transistor is connected to a lower end of a primary winding of the flyback converter.
6. The LED dual-color dimming built-in power supply according to claim 4, wherein the starting circuit comprises a starting switch, a second capacitor, a first resistor and a second resistor, a first end of the first resistor and a first end of the second resistor are respectively connected with the output end of the rectifying and filtering circuit, a controlled end of the starting switch is connected with a second end of the first resistor, an input end of the starting switch is connected with a second end of the second resistor, and an output end of the starting switch is grounded through the second capacitor; the output end of the starting switch is also connected with the power input end of the boost controller.
7. The LED dual-color dimming built-in power supply according to claim 1, wherein the DC-DC circuit comprises a constant current driving chip, a sixth diode, a seventh diode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a first inductor;
the output end of the PWM signal is respectively connected to the first end of the fourth resistor, the first end of the fifth resistor and the cathode of the sixth diode, the second end of the fourth resistor, the third end of the constant current driving chip, the input end of the power supply, the first end of the sixth resistor, the cathode of the seventh diode and the first end of the sixth capacitor are connected to each other and to the anode of the LED lamp, the second end of the fifth resistor, the first end of the fourth capacitor and the second end of the constant current driving chip are connected, the second end of the fourth capacitor and the anode of the sixth diode are grounded, the second end of the sixth resistor is connected to the first end of the fifth capacitor, the second end of the fifth capacitor, the anode of the seventh diode, the first end of the first inductor and the eighth end of the constant current driving chip are connected to each other, the second end of the first inductor is connected with the first end of the seventh resistor, and the second end of the seventh resistor is connected with the second end of the sixth capacitor and connected to the negative electrode of the LED lamp.
8. The LED dual-color dimming built-in power supply according to claim 7, wherein the model of the constant current driving chip is QW 2032.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920320588.7U CN210093612U (en) | 2019-03-13 | 2019-03-13 | LED double-color dimming built-in power supply |
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| CN201920320588.7U CN210093612U (en) | 2019-03-13 | 2019-03-13 | LED double-color dimming built-in power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111372358A (en) * | 2020-04-24 | 2020-07-03 | 深圳市海洋王照明工程有限公司 | LED drive control circuit, LED lamp and LED drive system |
| CN113573440A (en) * | 2020-04-29 | 2021-10-29 | 厦门凌阳华芯科技有限公司 | LED drive circuit and LED display device |
-
2019
- 2019-03-13 CN CN201920320588.7U patent/CN210093612U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111372358A (en) * | 2020-04-24 | 2020-07-03 | 深圳市海洋王照明工程有限公司 | LED drive control circuit, LED lamp and LED drive system |
| CN113573440A (en) * | 2020-04-29 | 2021-10-29 | 厦门凌阳华芯科技有限公司 | LED drive circuit and LED display device |
| CN113573440B (en) * | 2020-04-29 | 2023-12-22 | 厦门凌阳华芯科技股份有限公司 | LED drive circuit and LED display device |
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