CN211267188U

CN211267188U - Auxiliary power supply and control signal isolation processing device in LED power supply

Info

Publication number: CN211267188U
Application number: CN201922448570.8U
Authority: CN
Inventors: 成松亚; 薛巧巧; 盛敏杰; 张佳磊
Original assignee: Suzhou Shuomi Electronic Technology Co ltd
Current assignee: Suzhou Shuomi Electronic Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-08-14
Anticipated expiration: 2029-12-31

Abstract

The utility model relates to the technical field of lighting circuits, in particular to an isolation processing device for an auxiliary power supply and a control signal in a LED power supply, which comprises a LED output circuit and an auxiliary power supply circuit which are not communicated and isolated, and a control signal circuit which is not communicated and isolated with the LED output circuit; the auxiliary power supply circuit comprises a BUCK control chip, the BUCK control chip comprises 5 access ports, and the 2 nd and 5 th access ports on the BUCK control chip are connected with an input front stage; the BUCK control chip is electrically connected with the auxiliary power supply output through the 1 st, 3 rd and 4 th access ports. This auxiliary power supply and control signal's isolation processing apparatus in LED power, simple structure, low cost, the device is few, and the access is convenient, has accorded with the standard requirement, has controlled the safety risk, improves whole availability factor, the extensive popularization and use of being convenient for.

Description

Auxiliary power supply and control signal isolation processing device in LED power supply

Technical Field

The utility model belongs to the technical field of lighting circuit's technique and specifically relates to an auxiliary power source and control signal's isolation processing apparatus in LED power.

Background

With the improvement of life quality, the requirements of people on illumination quality are continuously updated, so that the use environment of the dimmable LED power supply is more and more. Corresponding standards organizations have made some standard specifications for this type of products, like IEC61347-1 in the structure section requires that the power supply must comply with corresponding isolation between different circuits, especially when it is mentioned that the same is also the case in the control signal lines. At the same time, the standard also exempts from three application situations, which can be processed without isolation, 1. the control signal is transmitted by the commercial power or is connected to the commercial power by a separate interface; 2. the control signal is transmitted by infrared or radio wave and the receiving device is arranged in the power supply shell; 3. the control signal device is matched with an external sensor and is arranged in the lamp. Similar requirements are also made by UL8750 and GB 19510.1. From the rigor of the standard, the safety risk is controlled, and space is left for the application without the safety risk actually. There are two current conventional approaches: 1. the control signal is isolated from other lines and the LED line is also isolated from the auxiliary power supply. 2. The control signal and the auxiliary power supply are not isolated from the LED circuit. The 1 st method completely meets the requirements in terms of functions, but because three criteria of reasonable application exemption do not exist, the largest waste is caused in the aspect of design cost; the 2 nd approach also meets the requirements in terms of functions after using the 3 rd condition of exemption, but its auxiliary power supply needs to be isolated from the LED circuit, and the LED is usually the main output loop, so the design cost of the auxiliary power supply is relatively high.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: in order to solve the problems existing in the background technology, the isolation processing device for the auxiliary power supply and the control signal in the LED power supply is provided, and has the advantages of simple structure, low cost, few devices, convenient access, conformity with the standard requirements, safety risk control, improvement of the whole use efficiency, and convenience for wide popularization and use.

The utility model provides a technical scheme that its technical problem adopted is: an isolation processing device for an auxiliary power supply and a control signal in an LED power supply comprises an LED output circuit and an auxiliary power supply circuit which are not communicated and isolated, and a control signal circuit which is not communicated and isolated with the LED output circuit; the auxiliary power supply circuit comprises a BUCK control chip, the BUCK control chip comprises 5 access ports, and the 2 nd and 5 th access ports on the BUCK control chip are connected with an input front stage; the BUCK control chip is electrically connected with the auxiliary power supply output through the 1 st, 3 rd and 4 th access ports.

Further limiting, in the above technical solution, the LED output circuit includes an LED output main control chip, and one side of the LED output main control chip is connected to the first photoelectric isolator; and the other side of the LED output main control chip is connected with the LED output through a detection resistor and a first freewheeling diode respectively.

Further, in the above technical solution, the control signal line includes a control signal to PMW chip, a filter capacitor, and a second photoelectric isolator; one side of the control signal PMW chip is connected with a control signal output end through a filter capacitor and a second photoelectric isolation respectively.

Further, in the above technical solution, an output detection resistor, a power inductor, and a second freewheeling diode are further disposed between the BUCK control chip and the auxiliary power supply output, and the output detection resistor, the power inductor, and the second freewheeling diode are all disposed in parallel.

Further, in the above technical solution, a starting resistor is further disposed between the BUCK control chip and the input front stage.

The utility model has the advantages that: the utility model provides an auxiliary power source and control signal's isolation processing apparatus in LED power, simple structure, low cost, the device is few, and it is convenient to insert, has accorded with the standard requirement, has controlled the safety risk, improves whole availability factor, the extensive popularization and use of being convenient for.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic connection diagram of the present invention.

The reference numbers in the figures are: us21 BUCK control chip; rs 21: starting a resistor; rs23, Rs 24: outputting a detection resistor; ls 21: a power inductor; ds 21: a second freewheeling diode; rs 11: detecting a resistance; ds11, first freewheeling diode; us11 LED output master control chip; us64A first opto-electronic isolation; us 61: converting the control signal into a PWM chip; us 64B: a second optoelectronic isolation; cs 64: and a filter capacitor.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 shows an isolation processing device for an auxiliary power supply and a control signal in an LED power supply, which includes an LED output line and an auxiliary power supply line that are not connected and isolated, and a control signal line that is not connected and isolated with the LED output line; the auxiliary power circuit comprises a BUCK control chip, the BUCK control chip comprises 5 access ports, and the No. 2 and No. 5 access ports on the BUCK control chip are connected with an input front stage; the BUCK controls the 1 st, 3 rd and 4 th access ports on the chip to be electrically connected with the output of the auxiliary power supply.

The LED output circuit comprises an LED output main control chip, and one side of the LED output main control chip is connected with the first photoelectric isolator; the other side of the LED output main control chip is connected with the LED output through a detection resistor and a first freewheeling diode respectively. The control signal circuit comprises a control signal-to-PMW chip, a filter capacitor and a second photoelectric isolator; one side of the control signal PMW chip is connected with the control signal output end through a filter capacitor and a second photoelectric isolation respectively. An output detection resistor, a power inductor and a second fly-wheel diode are further arranged between the BUCK control chip and the output of the auxiliary power supply, and the output detection resistor, the power inductor and the second fly-wheel diode are all arranged in parallel. And a starting resistor is also arranged between the BUCK control chip and the input front stage.

The above-mentioned, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. An isolation processing device for an auxiliary power supply and a control signal in an LED power supply is characterized by comprising an LED output circuit and an auxiliary power supply circuit which are not communicated and isolated, and a control signal circuit which is not communicated and isolated with the LED output circuit; the auxiliary power supply circuit comprises a BUCK control chip, the BUCK control chip comprises 5 access ports, and the 2 nd and 5 th access ports on the BUCK control chip are connected with an input front stage; the BUCK control chip is electrically connected with the auxiliary power supply output through the 1 st, 3 rd and 4 th access ports.

2. The device for isolating the auxiliary power supply from the control signal in the LED power supply as claimed in claim 1, wherein: the LED output circuit comprises an LED output main control chip, and one side of the LED output main control chip is connected with a first photoelectric isolator; and the other side of the LED output main control chip is connected with the LED output through a detection resistor and a first freewheeling diode respectively.

3. The device for isolating the auxiliary power supply from the control signal in the LED power supply as claimed in claim 1, wherein: the control signal circuit comprises a control signal-to-PMW chip, a filter capacitor and a second photoelectric isolator; one side of the control signal PMW chip is connected with a control signal output end through a filter capacitor and a second photoelectric isolation respectively.

4. The device for isolating the auxiliary power supply from the control signal in the LED power supply as claimed in claim 1, wherein: an output detection resistor, a power inductor and a second fly-wheel diode are further arranged between the BUCK control chip and the output of the auxiliary power supply, and the output detection resistor, the power inductor and the second fly-wheel diode are all arranged in parallel.

5. The device for isolating the auxiliary power supply from the control signal in the LED power supply as claimed in claim 1, wherein: and a starting resistor is also arranged between the BUCK control chip and the input preceding stage.