EMI (Electro-Magnetic Interference) control circuit applied to dimming power supply with auxiliary power supply

Abstract

The utility model discloses an EMI (Electro-Magnetic Interference) control circuit applied to a dimming power supply with an auxiliary power supply. The EMI control circuit comprises a signal terminal P1, a common mode inductor L101 and a common mode inductor L102, the AUX pin of the signal terminal P1 is connected with the first end of the common mode inductor L101, the DIM + pin is connected with the second end of the common mode inductor L102 or the second end of the common mode inductor L101, and the DIM-pin is connected with the second end of the common mode inductor L101 or the third end of the common mode inductor L102; a fifth end of the common mode inductor 102 is connected with a dimming signal positive electrode of the dimming signal processing module; the sixth end of the common mode inductor L102 is connected with the anode of the auxiliary power supply of the auxiliary power supply generation module; by means of the structure, after an upper dimmer and auxiliary equipment are connected, generated interference signals are subjected to primary suppression through the inductor L101 preferentially and then subjected to secondary suppression through the inductor L102, and therefore the EMI effect of the whole dimming signal line is improved.

Description

Technical Field

[0001] The utility model relates to a field, and in particular to an EMI control circuit applied to a dimming power supply with an auxiliary power supply. Background Art

[0002] With the rapid development of the LED lighting industry, LEDs are now installed in every household and outdoor lighting, which has also led to the booming LED power supply market and increasingly higher requirements for the EMI of LED power supplies.

[0003] At present, various dimming power supplies are the most widely used in the market. However, with the market demand, various dimming power supplies now add an auxiliary power output at the dimming end. When the auxiliary power supply of the LED power supply is connected to the load, an interference signal will be generated on the dimming signal, resulting in poor EMI effect of the dimming signal line of the LED power supply, thereby causing the dimming signal line of the LED power supply to fail the EMI test; therefore, it is very necessary to develop an EMI control circuit that can improve the LED dimming power supply including the auxiliary power supply. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an EMI control circuit applied to a dimming power supply with an auxiliary power supply.

[0005] An embodiment of the utility model adopts a technical solution to solve its technical problem: an EMI control circuit applied to a dimming power supply with an auxiliary power supply, comprising a signal terminal P1, a common mode inductor L101 and a common mode inductor L102;

[0006] The signal terminal P1 is connected to the dimmer and the auxiliary equipment, the AUX pin of the signal terminal P1 is connected to the first end of the common mode inductor L101, the DIM+ pin is connected to the second end of the common mode inductor L102, and the DIM- pin is connected to the second end of the common mode inductor L101;

[0007] The fourth end of the common mode inductor L101 is connected to the first end of the common mode inductor L102, and the third end is connected to the third end of the common mode inductor L102;

[0008] The fourth end of the common-mode inductor L102, the negative pole of the dimming signal of the dimming signal processing module, and the second end of the auxiliary power generation module are commonly connected to GND; the fifth end of the common-mode inductor 102 is connected to the positive pole of the dimming signal of the dimming signal processing module; the sixth end of the common-mode inductor L102 is connected to the positive pole of the auxiliary power supply of the auxiliary power generation module.

[0009] As one of the preferred embodiments of the utility model, an EMI control circuit applied to a dimming power supply with an auxiliary power supply also includes a bidirectional transient diode TVS1, a first end of the bidirectional transient diode TVS1 is connected to the DIM+ pin of the signal terminal P1 and the second end of the common-mode inductor L102, and a second end of the bidirectional transient diode TVS1 is connected to the DIM- pin of the signal terminal P1 and the second end of the common-mode inductor L101.

[0010] An EMI control circuit applied to a dimming power supply with an auxiliary power supply, comprising a signal terminal P1, a common mode inductor L101 and a common mode inductor L102;

[0011] The signal terminal P1 is connected to the dimmer and the auxiliary equipment, the AUX pin of the signal terminal P1 is connected to the first end of the common mode inductor L101, the DIM+ pin is connected to the second end of the common mode inductor L101, and the DIM- pin is connected to the third end of the common mode inductor L102;

[0012] The fourth end of the common mode inductor L101 is connected to the first end of the common mode inductor L102, and the third end is connected to the second end of the common mode inductor L102;

[0013] The fourth end of the common-mode inductor L102, the negative pole of the dimming signal of the dimming signal processing module, and the second end of the auxiliary power generation module are commonly connected to GND; the fifth end of the common-mode inductor 102 is connected to the positive pole of the dimming signal of the dimming signal processing module; the sixth end of the common-mode inductor L102 is connected to the positive pole of the auxiliary power supply of the auxiliary power generation module.

[0014] As one of the preferred embodiments of the utility model, an EMI control circuit applied to a dimming power supply with an auxiliary power supply also includes a bidirectional transient diode TVS1, a first end of the bidirectional transient diode TVS1 is connected to the DIM+ pin of the signal terminal P1 and the second end of the common-mode inductor L101, and a second end of the bidirectional transient diode TVS1 is connected to the DIM- pin of the signal terminal P1 and the third end of the common-mode inductor L102.

[0015] The beneficial effects of the utility model are as follows: an EMI control circuit applied to a dimming power supply with an auxiliary power supply, comprising a signal terminal P1, a common mode inductor L101 and a common mode inductor L102; the signal terminal P1 is connected to a dimmer and an auxiliary device, the AUX pin of the signal terminal P1 is connected to a first end of the common mode inductor L101, the DIM+ pin is connected to a second end of the common mode inductor L102 or the second end of the common mode inductor L101, and the DIM- pin is connected to a second end of the common mode inductor L101 or the third end of the common mode inductor L102; the fourth end of the common mode inductor L101 is connected to the first end of the common mode inductor L102, and the third end is connected to the AUX pin of the signal terminal P1. The third end of the common-mode inductor L102 is connected; the fourth end of the common-mode inductor L102, the negative electrode of the dimming signal of the dimming signal processing module, and the second end of the auxiliary power generation module are commonly connected to GND; the fifth end of the common-mode inductor 102 is connected to the positive electrode of the dimming signal of the dimming signal processing module; the sixth end of the common-mode inductor L102 is connected to the positive electrode of the auxiliary power supply of the auxiliary power generation module; through the above structure, after the dimmer and auxiliary equipment are connected, the interference signal generated can be preferentially suppressed by the inductor L101 for the first level, and then suppressed by the inductor L102 for the second level, thereby improving the EMI effect of the entire dimming signal line. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 A circuit schematic diagram of a first embodiment of an EMI control circuit for a dimming power supply with an auxiliary power supply;

[0018] Figure 2 The circuit schematic diagram of the second embodiment of an EMI control circuit applied to a dimming power supply with an auxiliary power supply. DETAILED DESCRIPTION

[0019] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0020] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0021] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0023] Reference Figure 1 , as a first embodiment of the EMI control circuit 30 provided by the utility model, an EMI control circuit applied to a dimming power supply with an auxiliary power supply includes a signal terminal P1, a common mode inductor L101 and a common mode inductor L102;

[0024] The signal terminal P1 is connected to the dimmer and the auxiliary equipment, the AUX pin of the signal terminal P1 is connected to the first end of the common mode inductor L101, the DIM+ pin is connected to the second end of the common mode inductor L102, and the DIM- pin is connected to the second end of the common mode inductor L101;

[0025] The fourth end of the common mode inductor L101 is connected to the first end of the common mode inductor L102, and the third end is connected to the third end of the common mode inductor L102;

[0026] The fourth end of the common-mode inductor L102, the negative pole of the dimming signal of the dimming signal processing module 10, and the second end of the auxiliary power generation module 20 are commonly connected to GND; the fifth end of the common-mode inductor 102 is connected to the positive pole of the dimming signal of the dimming signal processing module 10; the sixth end of the common-mode inductor L102 is connected to the positive pole of the auxiliary power of the auxiliary power generation module 20.

[0027] In one embodiment, an EMI control circuit applied to a dimming power supply with an auxiliary power supply also includes a bidirectional transient diode TVS1, a first end of the bidirectional transient diode TVS1 is connected to the DIM+ pin of the signal terminal P1 and the second end of the common-mode inductor L102, and a second end of the bidirectional transient diode TVS1 is connected to the DIM- pin of the signal terminal P1 and the second end of the common-mode inductor L101.

[0028] Reference Figure 2, as a second embodiment of the EMI control circuit 30 provided by the utility model, an EMI control circuit applied to a dimming power supply with an auxiliary power supply includes a signal terminal P1, a common mode inductor L101 and a common mode inductor L102;

[0029] The signal terminal P1 is connected to the dimmer and the auxiliary equipment, the AUX pin of the signal terminal P1 is connected to the first end of the common mode inductor L101, the DIM+ pin is connected to the second end of the common mode inductor L101, and the DIM- pin is connected to the third end of the common mode inductor L102;

[0030] The fourth end of the common mode inductor L101 is connected to the first end of the common mode inductor L102, and the third end is connected to the second end of the common mode inductor L102;

[0031] The fourth end of the common-mode inductor L102, the negative pole of the dimming signal of the dimming signal processing module 10, and the second end of the auxiliary power generation module 20 are commonly connected to GND; the fifth end of the common-mode inductor 102 is connected to the positive pole of the dimming signal of the dimming signal processing module 10; the sixth end of the common-mode inductor L102 is connected to the positive pole of the auxiliary power of the auxiliary power generation module 20.

[0032] In one embodiment, an EMI control circuit applied to a dimming power supply with an auxiliary power supply also includes a bidirectional transient diode TVS1, a first end of the bidirectional transient diode TVS1 is connected to the DIM+ pin of the signal terminal P1 and the second end of the common-mode inductor L101, and a second end of the bidirectional transient diode TVS1 is connected to the DIM- pin of the signal terminal P1 and the third end of the common-mode inductor L102.

[0033] The working principle of the utility model is as follows: when the system is powered on and the dimming signal is connected to the dimmer and auxiliary equipment, the interference signal generated is first suppressed by the inductor L101 and then suppressed by the inductor L102, thereby improving the EMI effect of the entire dimming signal line.

[0034] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. An EMI control circuit for a dimming power supply with an auxiliary power supply, characterized in that: It includes a signal terminal P1, a common mode inductor L101 and a common mode inductor L102; The signal terminal P1 is connected to the dimmer and auxiliary equipment, the AUX pin of the signal terminal P1 is connected to the first end of the common mode inductor L101, the DIM+ pin is connected to the second end of the common mode inductor L102, and the DIM- pin is connected to the second end of the common mode inductor L101; The fourth end of the common mode inductor L101 is connected to the first end of the common mode inductor L102, and the third end is connected to the third end of the common mode inductor L102; The fourth end of the common-mode inductor L102, the dimming signal negative electrode of the dimming signal processing module (10), and the second end of the auxiliary power generation module (20) are commonly connected to GND; the fifth end of the common-mode inductor L102 is connected to the dimming signal positive electrode of the dimming signal processing module (10); and the sixth end of the common-mode inductor L102 is connected to the auxiliary power positive electrode of the auxiliary power generation module (20).

2. According to claim 1, an EMI control circuit for a dimming power supply with an auxiliary power supply is characterized in that: It also includes a bidirectional transient diode TVS1, a first end of which is connected to the DIM+ pin of the signal terminal P1 and the second end of the common mode inductor L102, and a second end of which is connected to the DIM- pin of the signal terminal P1 and the second end of the common mode inductor L101.

3. An EMI control circuit for a dimming power supply with an auxiliary power supply, characterized in that: It includes a signal terminal P1, a common mode inductor L101 and a common mode inductor L102; The signal terminal P1 is connected to the dimmer and auxiliary equipment, the AUX pin of the signal terminal P1 is connected to the first end of the common mode inductor L101, the DIM+ pin is connected to the second end of the common mode inductor L101, and the DIM- pin is connected to the third end of the common mode inductor L102; The fourth end of the common mode inductor L101 is connected to the first end of the common mode inductor L102, and the third end is connected to the second end of the common mode inductor L102; The fourth end of the common-mode inductor L102, the dimming signal negative electrode of the dimming signal processing module (10), and the second end of the auxiliary power generation module (20) are commonly connected to GND; the fifth end of the common-mode inductor L102 is connected to the dimming signal positive electrode of the dimming signal processing module (10); and the sixth end of the common-mode inductor L102 is connected to the auxiliary power positive electrode of the auxiliary power generation module (20).

4. The EMI control circuit for a dimming power supply with an auxiliary power supply according to claim 3, characterized in that: It also includes a bidirectional transient diode TVS1, a first end of which is connected to the DIM+ pin of the signal terminal P1 and the second end of the common mode inductor L101, and a second end of which is connected to the DIM- pin of the signal terminal P1 and the third end of the common mode inductor L102.

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