CN212137970U

CN212137970U - High-grid-voltage LED drive circuit

Info

Publication number: CN212137970U
Application number: CN202021290399.9U
Authority: CN
Inventors: 饶远; 武圣明
Original assignee: Foshan Jindaming Technology Co ltd
Current assignee: Foshan Jindaming Technology Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2020-12-11
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a high grid voltage LED drive circuit, including EMC filtering module, rectifier bridge BR1, PWM control module and the constant current output module of electricity connection in order, the input and the external power supply electricity of EMC filtering module are connected, the output and the LED lamp pearl electricity of constant current output module are connected, PWM control module includes that the model is SDH7901SG main control chip U1 and resistance R5, resistance R5's one end is connected with rectifier bridge BR1 and constant current output module electricity respectively, and resistance R5's the other end is connected with main control chip U1's 3 feet electricity; through adopting dedicated type to be SDH7901 SG's main control chip, the peripheral circuit that the withstand voltage value is high is cooperated, can bear 380V's input voltage, guarantees that LED lamp pearl normally works, still has the advantage that material cost is low.

Description

High-grid-voltage LED drive circuit

Technical Field

The utility model relates to a LED power field, in particular to high grid voltage LED drive circuit.

Background

The LED drive circuit is a circuit for driving an LED lamp bead, but the existing LED drive circuit cannot work under the condition of high input voltage, and has the following problems: 1. when the voltage of a power grid exceeds 320V, the product can be burnt out due to overvoltage; 2. in order to deal with high-voltage input, a control circuit is designed to cut off the high-voltage input, and the cost of line materials is high.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a high grid voltage LED drive circuit can let LED lamp pearl normal work under 380V's input voltage, and has the advantage that control scheme is with low costs.

The utility model discloses a technical scheme that its technical problem was solved to an embodiment adopted is: the utility model provides a high grid voltage LED drive circuit, includes EMC filtering module, rectifier bridge BR1, PWM control module and the constant current output module of electricity connection in order, the input and the external power source electricity of EMC filtering module are connected, the output and the LED lamp pearl electricity of constant current output module are connected, PWM control module includes that the model is SDH7901 SG's main control chip U1 and resistance R5, resistance R5's one end is connected with rectifier bridge BR1 and constant current output module electricity respectively, and resistance R5's the other end is connected with main control chip U1's 3 feet electricity.

Further, the EMC filter module includes inductance L1, resistance R1 and electric capacity CX1, the one end of inductance L1 is connected with external power supply's one end, resistance R1's one end and electric capacity CX 1's one end electricity respectively, and the other end of inductance L1 is connected with rectifier bridge BR1 and resistance R1's the other end electricity respectively, and the other end of electric capacity CX1 is connected with external power supply's the other end and rectifier bridge BR1 electricity respectively.

Further, the constant current output module comprises an inductor L2, a resistor R4 and a capacitor ECX1, wherein one end of the inductor L2 is electrically connected with the 5 pin and the 6 pin of the main control chip U1, the other end of the inductor L2 is electrically connected with one end of the resistor R4, the negative electrode of the capacitor EC1 and the negative electrode of the LED lamp bead, and the positive electrode of the LED lamp bead is electrically connected with the positive electrode of the capacitor EC1, the other end of the resistor R4 and one end of the resistor R5.

Preferably, the high-grid-voltage LED driving circuit further comprises a fuse F1 having one end electrically connected to one end of an external power supply and the other end electrically connected to the EMC filter module.

Further, the input voltage of the external power supply is 85V-380V.

The utility model has the advantages that: a high-grid-voltage LED driving circuit comprises an EMC filtering module, a rectifier bridge BR1, a PWM control module and a constant current output module which are electrically connected in sequence, wherein the input end of the EMC filtering module is electrically connected with an external power supply, the output end of the constant current output module is electrically connected with an LED lamp bead, the PWM control module comprises a main control chip U1 and a resistor R5, the model of the main control chip U1 is SDH7901SG, one end of the resistor R5 is electrically connected with the rectifier bridge BR1 and the constant current output module respectively, and the other end of the resistor R5 is electrically connected with a pin 3 of the main control chip U1; through adopting dedicated type to be SDH7901 SG's main control chip, the peripheral circuit that the withstand voltage value is high is cooperated, can bear 380V's input voltage, guarantees that LED lamp pearl normally works, still has the advantage that material cost is low.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram of a high grid voltage LED driver circuit.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as excluding the number, and the terms greater than, less than, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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 thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise explicitly defined, the terms "set," "mounted," "connected," and the like are to be understood in a broad sense, and may be directly connected or indirectly connected through an intermediate medium, for example; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either as communication within the two elements or as an interactive relationship of the two elements. The technical skill in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.

Referring to fig. 1, a high grid voltage LED driving circuit, including EMC filtering module 10, rectifier bridge BR1, PWM control module 20 and the constant current output module 30 of electricity connection in order, the input and the external power source electricity of EMC filtering module 10 are connected, the output and the LED lamp pearl electricity of constant current output module 30 are connected, PWM control module 20 includes that the model is SDH7901 SG's main control chip U1 and resistance R5, resistance R5's one end is connected with rectifier bridge BR1 and constant current output module 30 electricity respectively, and resistance R5's the other end is connected with main control chip U1's 3 feet electricity.

EMC filter module 10 includes inductance L1, resistance R1 and electric capacity CX1, inductance L1's one end is connected with external power source's one end, resistance R1's one end and electric capacity CX 1's one end electricity respectively, and inductance L1's the other end is connected with rectifier bridge BR1 and resistance R1's the other end electricity respectively, and electric capacity CX 1's the other end is connected with external power source's the other end and rectifier bridge BR1 electricity respectively.

The constant current output module 30 comprises an inductor L2, a resistor R4 and a capacitor ECX1, wherein one end of the inductor L2 is electrically connected with a pin 5 and a pin 6 of the main control chip U1, the other end of the inductor L2 is electrically connected with one end of a resistor R4, a cathode of the capacitor EC1 and a cathode of an LED lamp bead, and an anode of the LED lamp bead is electrically connected with an anode of the capacitor EC1, the other end of the resistor R4 and one end of the resistor R5.

The high-grid-voltage LED driving circuit further comprises a fuse F1, one end of which is electrically connected with one end of an external power supply, and the other end of which is electrically connected with the EMC filtering module 10.

The input voltage of the external power supply is 85-380V of alternating current.

In the utility model, the product can stably work under the voltage of an alternating current 380V power grid through a special main control chip U1 with the type being SDH7901 SG; the method comprises the steps that 380V alternating current power grid voltage is input, after the voltage is input through a fuse F1, the voltage is processed through an EMC filtering module 10 consisting of an inductor L1, a resistor R1 and a capacitor CX1, then the voltage is rectified through a rectifier bridge BR1 to obtain 530V pulsating direct current voltage, the voltage charges a main control chip U1 through a resistor R5, after the starting voltage of VCC is reached, the main control chip U1 starts to work, the main control chip U1 automatically adjusts working frequency and duty ratio according to load conditions and input voltage to meet constant current output characteristics and match LED lamp bead load, and when the main control chip U1 detects that the load is over-current, the load is open-circuit and the working temperature of the main control chip U1 exceeds 155 ℃, the main control chip U1 enters a protection mode; through above circuit structure, can make LED lamp pearl still normally work under 380V's voltage, simplified line connection also can reduction in production cost.

Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications and substitutions are included in the scope defined by the claims of the present application.

Claims

1. A high grid voltage LED drive circuit characterized in that: including EMC filtering module (10), rectifier bridge BR1, PWM control module (20) and constant current output module (30) of electricity connection in order, the input and the external power source electricity of EMC filtering module (10) are connected, the output and the LED lamp pearl electricity of constant current output module (30) are connected, PWM control module (20) include that the model is SDH7901 SG's main control chip U1 and resistance R5, resistance R5's one end is connected with rectifier bridge BR1 and constant current output module (30) electricity respectively, and resistance R5's the other end is connected with main control chip U1's 3 feet electricity.

2. A high grid voltage LED driver circuit according to claim 1, characterized in that: EMC filter module (10) includes inductance L1, resistance R1 and electric capacity CX1, inductance L1's one end is connected with external power source's one end, resistance R1's one end and electric capacity CX 1's one end electricity respectively, and inductance L1's the other end is connected with rectifier bridge BR1 and resistance R1's the other end electricity respectively, and electric capacity CX 1's the other end is connected with external power source's the other end and rectifier bridge BR1 electricity respectively.

3. A high grid voltage LED driver circuit according to claim 1, characterized in that: the constant current output module (30) comprises an inductor L2, a resistor R4 and a capacitor ECX1, wherein one end of the inductor L2 is electrically connected with a pin 5 and a pin 6 of a main control chip U1 respectively, the other end of the inductor L2 is electrically connected with one end of a resistor R4, a cathode of the capacitor EC1 and a cathode of an LED lamp bead respectively, and an anode of the LED lamp bead is electrically connected with an anode of the capacitor EC1, the other end of the resistor R4 and one end of the resistor R5 respectively.

4. A high grid voltage LED driver circuit according to claim 1, characterized in that: and the fuse F1 is electrically connected with one end of an external power supply and the other end of the external power supply and the EMC filtering module (10).

5. A high grid voltage LED driver circuit according to claim 1, characterized in that: the input voltage of the external power supply is 85-380V of alternating current.