CN116170913A

CN116170913A - Self-adaptive wide-voltage Triac dimming LED power supply

Info

Publication number: CN116170913A
Application number: CN202310150311.5A
Authority: CN
Inventors: 雷雪钉; 周润根
Original assignee: Shenzhen Amb Optoelectronics Technology Co ltd
Current assignee: Shenzhen Amb Optoelectronics Technology Co ltd
Priority date: 2023-02-07
Filing date: 2023-02-07
Publication date: 2023-05-26

Abstract

The application relates to a self-adaptive wide-voltage Triac dimming LED power supply, which is characterized in that a phase acquisition circuit and a step-down dimming circuit are used for further enabling the phase acquisition circuit to acquire and monitor a Triac phase-cutting angle in real time and acquire the Triac phase-cutting angle, and a pulse width modulation signal is generated according to the Triac phase-cutting angle; meanwhile, the step-down dimming circuit is connected with the phase acquisition circuit, the step-down dimming circuit generates a current adjustment signal according to the pulse width modulation signal, and the current adjustment signal adjusts the output current of the output circuit so as to dim an LED lamp, thereby realizing the acquisition of the Triac phase-cut angle of the AC wide voltage input through the setting of the phase acquisition circuit, and further realizing the self-adaptive wide voltage dimming LED power supply of the AC wide voltage input dimming.

Description

Self-adaptive wide-voltage Triac dimming LED power supply

Technical Field

The application relates to the technical field of dimming power supplies, in particular to a self-adaptive wide-voltage Triac dimming LED power supply.

Background

Currently, non-energy saving lighting dimming is mainly performed by using a TRIAC dimmer, that is, a TRIAC dimmer, which is also currently the most widely used dimmer.

Technical schemes related to Triac dimming in the market are various, for example, an adapter for a traditional Triac dimming lamp and a novel Triac dimming lamp are disclosed in the invention patent with publication number CN211457467U, the adapter is connected between a power supply circuit and the traditional Triac dimming lamp, the adapter is arranged on the traditional Triac dimming lamp, one end of the adapter is connected with a power supply input end of the Triac dimming lamp, the other end of the adapter is connected with the power supply circuit, a control circuit is arranged in the adapter, the control circuit comprises a power supply module, a voltage detection module and a thyristor control module, and the thyristor control module comprises a thyristor control unit and a thyristor drive unit.

Although the wiring mode of the conventional Triac dimming lamp can be improved and the functions of brightness adjustment and switching adjustment can be realized in the technical scheme, the same technical problems still exist as those of other products in the prior art 416, such as that the Triac dimming LED power supply cannot realize wide voltage input, and only can realize fixed AC voltage dimming, thereby influencing the use.

Disclosure of Invention

In view of the foregoing, it is desirable to provide an adaptive wide-voltage Triac dimming LED power supply capable of achieving AC wide-voltage input dimming.

The technical scheme of the invention is as follows:

the self-adaptive wide-voltage Triac dimming LED power supply comprises an EMC input circuit, a rectifying circuit, a PFC control circuit, a transformer and an output circuit, wherein the rectifying circuit is connected with the EMC input circuit, the PFC control circuit is connected with the rectifying circuit, the transformer is connected with the PFC control circuit, the output circuit is connected with the transformer, the output circuit is also used for being connected with an LED lamp, and the self-adaptive wide-voltage Triac dimming LED power supply further comprises a phase acquisition circuit and a buck dimming circuit, wherein the phase acquisition circuit is used for carrying out real-time acquisition monitoring on a Triac phase-cut angle and acquiring the Triac phase-cut angle and generating a pulse width modulation signal according to the Triac phase-cut angle; the step-down dimming circuit is connected with the phase acquisition circuit, and is used for generating a current adjustment signal according to the pulse width modulation signal and adjusting the output current of the output circuit by the current adjustment signal so as to dim the LED lamp.

Specifically, the phase acquisition circuit comprises a signal acquisition circuit and an optocoupler isolation circuit, wherein the optocoupler isolation circuit is connected with the signal acquisition circuit, the signal acquisition circuit is used for carrying out real-time acquisition monitoring on a Triac phase-cut angle and acquiring the Triac phase-cut angle, and generating a pulse width modulation signal according to the Triac phase-cut angle, and the pulse width modulation signal is sent to the step-down dimming circuit through the optocoupler isolation circuit.

Specifically, the signal acquisition circuit comprises a second rectifier bridge, a first resistor, a second resistor, a phase acquisition chip and a modulation signal output end, wherein the input end of the second rectifier bridge is connected with alternating current; the first resistor is connected with the second rectifier bridge, the second resistor is connected with the first resistor, a fifth pin of the phase acquisition chip is connected with the second resistor, a fourth capacitor is arranged between a seventh pin and a tenth pin of the phase acquisition chip, a modulation signal output end is connected with an eighth pin of the phase acquisition chip, and the modulation signal output end is also connected with the optocoupler isolation circuit.

Specifically, the signal acquisition circuit further comprises a sixth resistor and a tenth resistor, two ends of the sixth resistor are respectively connected with the seventh pin of the phase acquisition chip and the fourth capacitor, and two ends of the tenth resistor are respectively connected with the tenth pin of the phase acquisition chip and the fourth capacitor.

Specifically, the optocoupler isolation circuit comprises a signal connection port, a voltage stabilizing chip and an optocoupler, wherein the signal connection port is connected with the modulation signal output end, the voltage stabilizing chip is connected with the signal connection port, the input end of the optocoupler U4 is connected with a first pin of the signal connection port, and the output end of the optocoupler is connected with the buck dimming circuit.

Specifically, the optical coupler isolation circuit further comprises a thirty-eighth resistor and a thirty-ninth resistor, one end of the thirty-eighth resistor is connected with the input end of the optical coupler, and the other end of the thirty-eighth resistor is connected with the first pin of the signal connection port; and two ends of the thirty-ninth resistor are respectively connected with the output end of the optocoupler and the buck dimming circuit.

Specifically, the step-down dimming circuit comprises a dimming chip and an MOS tube, wherein a fifth pin of the dimming chip is connected with the output end of the optocoupler, a grid electrode of the MOS tube is connected with a sixth pin of the dimming chip, and a source electrode of the MOS tube is also connected with the output circuit; the drain electrode of the MOS tube is also connected with the first pin of the dimming chip; and the third pin and the fourth pin of the dimming chip are connected with the output circuit.

Specifically, the EMC input circuit comprises a zero line input end, a fire wire input end and a work module inductor, wherein the zero line input end and the fire wire input end are respectively connected with the input end of the work module inductor, and the output end of the work module inductor is connected with the rectifying circuit.

Specifically, the rectifying circuit comprises a first rectifying bridge, wherein the input end of the first rectifying bridge is connected with the output end of the industrial die inductor, and the output end of the first rectifying bridge is connected with the PFC control circuit; the PFC control circuit comprises a main control chip and an inductor, wherein the inductor is connected with the first rectifier bridge, the main control chip is connected with the inductor, and the main control chip is also connected with the transformer.

Specifically, the output circuit comprises a first diode, a positive electrode output end and a negative electrode output end; the first diode is connected with the secondary winding of the transformer, the positive electrode output end and the negative electrode output end are connected with the first diode, and the positive electrode output end and the negative electrode output end are also used for being connected with an LED lamp; the first diode is connected with the thirteenth resistor and the twenty-first resistor and then connected with a third pin and a fourth pin of a dimming chip in the buck dimming circuit.

The invention has the following technical effects:

according to the invention, the phase acquisition circuit and the step-down dimming circuit are arranged, so that the phase acquisition circuit acquires and monitors the Triac phase-cut angle in real time, acquires the Triac phase-cut angle, and generates a pulse width modulation signal according to the Triac phase-cut angle; meanwhile, the step-down dimming circuit is connected with the phase acquisition circuit, the step-down dimming circuit generates a current adjustment signal according to the pulse width modulation signal, and the current adjustment signal adjusts the output current of the output circuit so as to dim an LED lamp, thereby realizing the acquisition of the Triac phase-cut angle of the AC wide voltage input through the setting of the phase acquisition circuit, and further realizing the self-adaptive wide voltage dimming LED power supply of the AC wide voltage input dimming.

Drawings

FIG. 1 is a block diagram of the overall architecture of an adaptive wide voltage Triac dimming LED power supply in one embodiment;

FIG. 2 is a schematic circuit diagram of a phase acquisition circuit in one embodiment;

fig. 3 is a schematic circuit diagram of an EMC input circuit, a rectifier circuit, a PFC control circuit, a transformer, a buck dimming circuit, and an output circuit in one embodiment.

Reference numerals:

100. EMC input circuit; 200. a rectifying circuit; 300. a PFC control circuit; 400. an output circuit; 500. a phase acquisition circuit; 510. a signal acquisition circuit; 520. an optocoupler isolation circuit; 600. a buck dimming circuit.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

In one embodiment, as shown in fig. 1-3, an adaptive wide voltage Triac dimming LED power supply is provided, comprising an EMC input circuit 100, a rectifying circuit 200, a PFC control circuit 300, a transformer and an output circuit 400, wherein the rectifying circuit 200 is connected to the EMC input circuit 100, the PFC control circuit 300 is connected to the rectifying circuit 200, the transformer is connected to the PFC control circuit 300, the output circuit 400 is connected to the transformer, and the output circuit 400 is further used for connecting an LED lamp. In this embodiment, the number of the transformer is T1, as shown in fig. 3.

The adaptive wide-voltage Triac dimming LED power supply further comprises a phase acquisition circuit 500 and a step-down dimming circuit 600, wherein the phase acquisition circuit 500 is used for carrying out real-time acquisition monitoring on a Triac phase-cutting angle and acquiring the Triac phase-cutting angle, and generating a pulse width modulation signal according to the Triac phase-cutting angle; the step-down dimming circuit 600 is connected to the phase acquisition circuit 500, and the step-down dimming circuit 600 is configured to generate a current adjustment signal according to the pulse width modulation signal, and adjust the output current of the output circuit 400 by using the current adjustment signal, so as to dim the LED lamp.

According to the invention, by arranging the phase acquisition circuit 500 and the step-down dimming circuit 600, the phase acquisition circuit 500 is further used for carrying out real-time acquisition and monitoring on the Triac phase-cut angle, acquiring the Triac phase-cut angle and generating a pulse width modulation signal according to the Triac phase-cut angle; meanwhile, the step-down dimming circuit 600 is connected with the phase acquisition circuit 500, the step-down dimming circuit 600 generates a current adjustment signal according to the pulse width modulation signal, and adjusts the output current of the output circuit 400 according to the current adjustment signal so as to dim an LED lamp, thereby realizing acquisition of a Triac phase-cut angle of an AC wide voltage input through setting of the phase acquisition circuit 500, and further realizing self-adaptive wide voltage dimming LED power supply of the AC wide voltage input dimming.

As shown in fig. 1-3, the phase acquisition circuit 500 includes a signal acquisition circuit 510 and an optocoupler isolation circuit 520, where the optocoupler isolation circuit 520 is connected to the signal acquisition circuit 510, and the signal acquisition circuit 510 is configured to perform real-time acquisition monitoring on a Triac phase-cut angle and obtain the Triac phase-cut angle, and is configured to generate a pulse width modulation signal according to the Triac phase-cut angle, and the pulse width modulation signal is sent to the buck dimming circuit 600 through the optocoupler isolation circuit 520.

As shown in fig. 1 to 3, the signal acquisition circuit 510 includes a second rectifier bridge BD2, a first resistor R1, a second resistor R2, a phase acquisition chip U3, and a modulated signal output PWM, where an input end of the second rectifier bridge BD2 is connected to an ac power; the first resistor R1 is connected with the second rectifier bridge BD2, the second resistor R2 is connected with the first resistor R1, a fifth pin of the phase acquisition chip U3 is connected with the second resistor R2, a fourth capacitor C4 is arranged between a seventh pin and a tenth pin of the phase acquisition chip U3, a modulation signal output end PWM is connected with an eighth pin of the phase acquisition chip U3, and the modulation signal output end PWM is also connected with the optocoupler isolation circuit 520.

As shown in fig. 1-3, the signal acquisition circuit 510 further includes a sixth resistor R6 and a tenth resistor R10, two ends of the sixth resistor R6 are respectively connected to the seventh pin of the phase acquisition chip U3 and the fourth capacitor C4, and two ends of the tenth resistor R10 are respectively connected to the tenth pin of the phase acquisition chip U3 and the fourth capacitor C4.

As shown in fig. 1-3, the optocoupler isolation circuit 520 includes a signal connection port P1, a voltage stabilizing chip U5 and an optocoupler U4, where the signal connection port P1 is connected with the modulated signal output end PWM, the voltage stabilizing chip U5 is connected with the signal connection port P1, an input end of the optocoupler U4 is connected with a first pin of the signal connection port P1, and an output end of the optocoupler U4 is connected with the buck dimming circuit 600.

As shown in fig. 1-3, the optocoupler isolation circuit 520 further includes a thirty-eighth resistor R38 and a thirty-ninth resistor R39, wherein one end of the thirty-eighth resistor R38 is connected to the input end of the optocoupler U4, and the other end of the thirty-eighth resistor R38 is connected to the first pin of the signal connection port P1; both ends of the thirty-ninth resistor R39 are respectively connected to the output end of the optocoupler U4 and the buck dimming circuit 600.

As shown in fig. 1-3, the buck dimming circuit 600 includes a dimming chip U2 and a MOS transistor Q1, wherein a fifth pin of the dimming chip U2 is connected to an output end of the optocoupler U4, a gate of the MOS transistor Q1 is connected to a sixth pin of the dimming chip U2, and a source of the MOS transistor Q1 is further connected to the output circuit 400; the drain electrode of the MOS tube Q1 is also connected with the first pin of the dimming chip U2; the third pin and the fourth pin of the dimming chip U2 are connected to the output circuit 400.

In the step, by setting the first resistor R1 and the second resistor R2, the phase-cut angle signal is loaded to the 5 pin (forward input end) of the phase acquisition chip U3 through the resistance attenuation of the first resistor R1 and the second resistor R2, and the 7 pin (reverse input end) of the phase acquisition chip U3 is a reference voltage (1.5V); charging and discharging the C4 by comparing the voltages at two ends to obtain a voltage signal; the C4 voltage signal is loaded to the 10 pin of the phase acquisition chip U3, and the clock signal is loaded to the 9 pin (reverse input pin) of the phase acquisition chip U3; the C4 voltage signal is applied to the 10 pin (positive input) of the phase acquisition chip U3, and a pwm signal is output by comparing the voltages at both ends.

In one embodiment, as shown in fig. 1-3, the EMC input circuit 100 includes a neutral input terminal ACN, a live input terminal ACL, and a working mode inductor LF1, where the neutral input terminal ACN and the live input terminal ACL are respectively connected to the input terminal of the working mode inductor LF1, and the output terminal of the working mode inductor LF1 is connected to the rectifying circuit 200.

As shown in fig. 1-3, the rectifying circuit 200 includes a first rectifying bridge BD1, an input end of the first rectifying bridge BD1 is connected to an output end of the die inductor LF1, and an output end of the first rectifying bridge BD1 is connected to the PFC control circuit 300; the PFC control circuit 300 includes a main control chip U1 and an inductor L1, the inductor L1 is connected with the first rectifier bridge BD1, the main control chip U1 is connected with the inductor L1, and the main control chip U1 is further connected with the transformer.

As shown in fig. 1-3, the output circuit 400 includes a first diode D1, a positive output led+ and a negative output LED-; the first diode D1 is connected with a secondary winding of the transformer, the positive electrode output end LED+ and the negative electrode output end LED-are connected with the first diode D1, and the positive electrode output end LED+ and the negative electrode output end LED-are also used for being connected with an LED lamp; the first diode D1 is connected to the thirteenth resistor R13 and the twenty-first resistor R21, and then connected to the third pin and the fourth pin of the dimming chip U2 in the buck dimming circuit 600.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. The self-adaptive wide-voltage Triac dimming LED power supply comprises an EMC input circuit, a rectifying circuit, a PFC control circuit, a transformer and an output circuit, wherein the rectifying circuit is connected with the EMC input circuit, the PFC control circuit is connected with the rectifying circuit, the transformer is connected with the PFC control circuit, the output circuit is connected with the transformer, and the output circuit is also used for being connected with an LED lamp, and is characterized by further comprising a phase acquisition circuit and a step-down dimming circuit, wherein the phase acquisition circuit is used for carrying out real-time acquisition monitoring on a Triac phase-cut angle and acquiring the Triac phase-cut angle and generating a pulse width modulation signal according to the Triac phase-cut angle; the step-down dimming circuit is connected with the phase acquisition circuit, and is used for generating a current adjustment signal according to the pulse width modulation signal and adjusting the output current of the output circuit by the current adjustment signal so as to dim the LED lamp.

2. The adaptive wide voltage Triac dimmed LED power supply of claim 1, wherein the phase acquisition circuit comprises a signal acquisition circuit and an optocoupler isolation circuit, the optocoupler isolation circuit is connected to the signal acquisition circuit, the signal acquisition circuit is configured to perform real-time acquisition monitoring on a Triac phase-cut angle and obtain the Triac phase-cut angle, and configured to generate a pulse-width modulation signal according to the Triac phase-cut angle, the pulse-width modulation signal being sent to the buck dimming circuit via the optocoupler isolation circuit.

3. The adaptive wide voltage Triac dimmed LED power supply as defined in claim 2, wherein the signal acquisition circuit comprises a second rectifier bridge, a first resistor, a second resistor, a phase acquisition chip, and a modulated signal output, the input of the second rectifier bridge being connected to the ac power; the first resistor is connected with the second rectifier bridge, the second resistor is connected with the first resistor, a fifth pin of the phase acquisition chip is connected with the second resistor, a fourth capacitor is arranged between a seventh pin and a tenth pin of the phase acquisition chip, a modulation signal output end is connected with an eighth pin of the phase acquisition chip, and the modulation signal output end is also connected with the optocoupler isolation circuit.

4. The adaptive wide-voltage Triac dimmed LED power supply according to claim 3, wherein said signal acquisition circuit further comprises a sixth resistor and a tenth resistor, wherein two ends of said sixth resistor are respectively connected to a seventh pin of said phase acquisition chip and said fourth capacitor, and two ends of said tenth resistor are respectively connected to a tenth pin of said phase acquisition chip and said fourth capacitor.

5. The adaptive wide-voltage Triac dimmer LED power supply of claim 3, wherein said optocoupler isolation circuit comprises a signal connection port, a voltage stabilizing chip and an optocoupler, said signal connection port is connected to said modulated signal output, said voltage stabilizing chip is connected to said signal connection port, an input of said optocoupler U4 is connected to a first pin of said signal connection port, and an output of said optocoupler is connected to said buck dimmer circuit.

6. The adaptive wide voltage Triac dimmed LED power supply according to claim 5, wherein the optocoupler isolation circuit further comprises a thirty-eighth resistor and a thirty-ninth resistor, one end of the thirty-eighth resistor being connected to the input terminal of the optocoupler, the other end of the thirty-eighth resistor being connected to the first pin of the signal connection port; and two ends of the thirty-ninth resistor are respectively connected with the output end of the optocoupler and the buck dimming circuit.

7. The adaptive wide-voltage Triac dimmed LED power supply according to claim 6, wherein the buck dimming circuit comprises a dimming chip and a MOS transistor, wherein a fifth pin of the dimming chip is connected to the output terminal of the optocoupler, a gate of the MOS transistor is connected to a sixth pin of the dimming chip, and a source of the MOS transistor is further connected to the output circuit; the drain electrode of the MOS tube is also connected with the first pin of the dimming chip; and the third pin and the fourth pin of the dimming chip are connected with the output circuit.

8. The adaptive wide voltage Triac dimmed LED power supply according to any one of claims 1-7, wherein the EMC input circuit comprises a neutral input, a hot input, and a die inductor, the neutral input and the hot input being connected to inputs of the die inductor, respectively, and an output of the die inductor being connected to the rectifying circuit.

9. The adaptive wide voltage Triac dimmed LED power supply as defined in claim 8, wherein the rectifier circuit comprises a first rectifier bridge, an input of the first rectifier bridge being connected to an output of the die inductor, an output of the first rectifier bridge being connected to the PFC control circuit; the PFC control circuit comprises a main control chip and an inductor, wherein the inductor is connected with the first rectifier bridge, the main control chip is connected with the inductor, and the main control chip is also connected with the transformer.

10. The adaptive wide voltage Triac dimmed LED power supply according to claim 9, wherein the output circuit comprises a first diode, a positive output terminal, and a negative output terminal; the first diode is connected with the secondary winding of the transformer, the positive electrode output end and the negative electrode output end are connected with the first diode, and the positive electrode output end and the negative electrode output end are also used for being connected with an LED lamp; the first diode is connected with the thirteenth resistor and the twenty-first resistor and then connected with a third pin and a fourth pin of a dimming chip in the buck dimming circuit.