CN216357398U - Drive circuit for preventing LED light source from lighting in standby - Google Patents

Abstract

The utility model provides a driving circuit for preventing an LED light source from being turned on in a standby state, which comprises: the LED control system comprises a rectification module, a front-stage I C control module, a ghost fire prevention control module, a rear-stage I C control module and an LED control module; the output end of the rectifying module is connected with a front-stage I C control module, a front-stage I C control module is connected with a primary coil of a transformer, and a rear-stage I C control module is connected with a secondary coil of the transformer; the output end of the rear-stage I C control module is connected with the LED control module; the anti-ghost-fire control module is used for connecting the front-stage IC control module and the rear-stage I C control module with a ground wire so as to directly flow the leakage current of the front-stage I C driving module and the leakage current of the rear-stage I C control module into the ground wire in a standby state and reduce the leakage current flowing through the distributed capacitance between the light source and the shell.

Description

Drive circuit for preventing LED light source from lighting in standby

Technical Field

The utility model relates to an LED, in particular to an LED driving circuit.

Background

In recent years, with the development of science and technology, the market demand of the LED lamp is continuously expanded, the market share of the LED lamp is continuously promoted, and the LED lamp enters thousands of households. However, as the LED electric lamps are popularized, the problems of the LED electric lamps are gradually highlighted, and investigation shows that some household LED lamps have the problem of intermittent flicker in the standby state, which causes great troubles to normal life of users.

The intermittent flashing is caused by that when the shell of a plurality of lamps in the market is grounded and connected with the lamp, after the lamps enter a standby state, the lamps can be slightly bright or slightly flash due to the distributed capacitance between the LED light source and the shell ground, and the phenomenon of ghost fire is commonly known.

SUMMERY OF THE UTILITY MODEL

The main technical problem to be solved by the present invention is to provide a driving circuit for preventing the LED light source from lighting up during standby, so as to ensure that when the LED light source is connected to a lamp, the lamp has no current output and no residual light during standby,

in order to solve the above-mentioned technical problem, the present invention provides a driving circuit for preventing an LED light source from being turned on in a standby state, comprising: the LED driving circuit comprises a rectification module, a front-stage IC control module, a ghost fire prevention control module, a rear-stage IC control module and an LED control module;

the output end of the rectification module is connected with a preceding stage IC control module, the preceding stage IC control module is connected with a primary coil of the transformer, and the rear stage IC control module is connected with a secondary coil of the transformer; the output end of the rear-stage IC control module is connected with the LED control module;

the anti-ghost-fire control module is used for connecting the front-stage IC control module and the rear-stage IC control module with the ground wire so as to directly flow the leakage current of the front-stage IC drive module and the leakage current of the rear-stage IC control module into the ground wire in a standby state and reduce the leakage current flowing through the distributed capacitance between the light source and the shell.

In a preferred embodiment: the anti-ghost-fire module comprises a capacitor CY1, a capacitor CY2 and an inductor L1;

one end of the capacitor CY1 is connected to any one end of the primary coil of the transformer, the other end of the capacitor CY1 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to the ground wire; one end of the capacitor CY2 is connected with any end of the rear-stage IC control module, and the other end of the capacitor CY2 is connected with one end of the inductor L1.

In a preferred embodiment: the anti-ghost-fire module comprises a capacitor CY1, a capacitor CY2, a capacitor CY3, a capacitor CY4, an inductor L1 and an inductor L2;

one end of the capacitor CY1 is connected to the GND end of the primary coil of the transformer, the other end of the capacitor CY1 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to the ground wire; one end of the capacitor CY3 is connected with the GND end of the rear-stage IC control module, and the other end of the capacitor CY3 is connected with one end of the inductor L1; the inductor L2 is connected in parallel with the inductor L1, the capacitor CY2 is connected in parallel with the capacitor CY1, and the capacitor CY4 is connected in parallel with the capacitor CY 3.

In a preferred embodiment: the anti-ghost-fire module comprises a capacitor CY1, a capacitor CY2, a capacitor CY3, a capacitor CY4, an inductor L1 and an inductor L2;

the capacitor CY1, the capacitor CY2, the inductor L2 and the inductor L1 are connected between the GND end of the primary coil and the ground wire in series; the capacitor CY4, the capacitor CY3, the inductor L2 and the inductor L1 are connected between the GND end of the rear-stage IC control module and the ground wire in series.

Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:

the utility model provides a driving circuit for preventing an LED light source from being lightened in a standby state. And after the LED enters the standby state, the anti-ghost module directly flows the leakage current of the front-stage IC drive module and the leakage current of the rear-stage IC control module in the standby state into the ground wire, so that the leakage current flowing through the distributed capacitor between the light source and the shell is reduced. Therefore, the problem of flickering of the LED lamp in a standby state is solved, the circuit is simple, the design is convenient, the cost is low, and mass production can be realized.

Drawings

FIG. 1 is a circuit diagram of a preferred embodiment 1 of the present invention;

FIG. 2 is a circuit diagram of the preferred embodiment 2 of the present invention;

FIG. 3 is a circuit diagram of the preferred embodiment 3 of the present invention;

fig. 4 is a circuit diagram of the preferred embodiment 4 of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like, are used in a broad sense, and for example, "connected" may be a wall-mounted connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, and those skilled in the art will understand the specific meaning of the terms in the present invention specifically.

The present embodiment provides a driving circuit for preventing an LED light source from being turned on in a standby state, including: the LED driving circuit comprises a rectification module, a front-stage IC control module, a ghost fire prevention control module, a rear-stage IC control module and an LED control module;

the output end of the rectification module is connected with a preceding stage IC control module, the preceding stage IC control module is connected with a primary coil of the transformer, and the rear stage IC control module is connected with a secondary coil of the transformer; the output end of the rear-stage IC control module is connected with the LED control module;

the anti-ghost-fire control module is used for connecting the front-stage IC control module and the rear-stage IC control module with the ground wire so as to directly flow the leakage current of the front-stage IC drive module and the leakage current of the rear-stage IC control module into the ground wire in a standby state and reduce the leakage current flowing through the distributed capacitance between the light source and the shell.

The drive circuit for preventing the LED light source from being lightened in the standby state is characterized in that the anti-ghost module is added into the drive circuit, and the anti-ghost module does not act when the LED is normally lightened. And after the LED enters the standby state, the anti-ghost module directly flows the leakage current of the front-stage IC drive module and the leakage current of the rear-stage IC control module in the standby state into the ground wire, so that the leakage current flowing through the distributed capacitor between the light source and the shell is reduced. Therefore, the problem of flickering of the LED lamp in a standby state is solved, the circuit is simple, the design is convenient, the cost is low, and mass production can be realized.

The present embodiment provides four possible designs of the anti-ghost fire module, which are as follows:

example 1

Referring to fig. 1, in the present embodiment, the anti-ghost module includes a capacitor CY1, a capacitor CY2, and an inductor L1;

one end of the capacitor CY1 is connected to the GND end of the primary coil of the transformer, the other end of the capacitor CY1 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to the ground wire PE; one end of the capacitor CY2 is connected with the GND end of the rear-stage IC control module, and the other end of the capacitor CY2 is connected with one end of the inductor L1.

When the lamp is powered on, the anti-ghost module does not influence the normal work of the circuit, after the lamp enters a standby state, the leakage current of the front-stage IC driving module and the leakage current generated by the rear-stage IC control module flow into the ground wire PE through the capacitor CY1 and the capacitor CY2 to the inductor L1, and the rear-stage LED light source does not flow in current at all, so that the problems of micro-brightness and flashing of the light source module are completely solved.

Example 2

Referring to fig. 2, the present embodiment is different from embodiment 1 in that: the capacitor CY1 is connected to the 4 terminal of the primary coil, and the capacitor CY2 is connected to the C terminal of the rear-stage IC control module. When the lamp is powered on, the anti-ghost module does not influence the normal work of the circuit, after the lamp enters a standby state, the leakage current of the front-stage IC driving module and the leakage current generated by the rear-stage IC control module flow into the ground wire PE through the capacitor CY1 and the capacitors CY2 to L1, and the rear-stage LED light source does not flow current at all, so that the problems of slight brightness and flashing of the light source module are completely solved.

As a simple alternative to this embodiment, the capacitor CY1 may also be connected to any of the pins 1, 3, 4, 5 of the transformer. The capacitor CY2 may be connected to any one of the A, B, C, D terminals of the later stage IC control module.

Example 3

Referring to fig. 3, the anti-ghost fire module includes a capacitor CY1, a capacitor CY2, a capacitor CY3, a capacitor CY4, an inductor L1, and an inductor L2;

one end of the capacitor CY1 is connected to the GND end of the primary coil of the transformer, the other end of the capacitor CY1 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to the ground wire PE; one end of the capacitor CY3 is connected with the GND end of the rear-stage IC control module, and the other end of the capacitor CY3 is connected with one end of the inductor L1; the inductor L2 is connected in parallel with the inductor L1, the capacitor CY2 is connected in parallel with the capacitor CY1, and the capacitor CY4 is connected in parallel with the capacitor CY 3.

When the lamp is powered on, the anti-ghost module does not influence the normal work of the circuit, after the lamp enters a standby state, the leakage current of the front-stage IC drive module and the leakage current generated by the rear-stage IC control module flow into the ground wire PE through the capacitor CY1, the capacitor CY2, the capacitors CY3 and CY4 to the inductor L1 and the inductor L2, and no current flows into the rear-stage LED light source completely, so that the problems of micro-lighting and flashing of the light source module are solved completely.

Example 4

Referring to fig. 4, the anti-ghost fire module includes a capacitor CY1, a capacitor CY2, a capacitor CY3, a capacitor CY4, an inductor L1, and an inductor L2;

the capacitor CY1, the capacitor CY2, the inductor L2 and the inductor L1 are connected between the GND end of the primary coil and the ground wire in series; the capacitor CY4, the capacitor CY3, the inductor L2 and the inductor L1 are connected between the GND end of the rear-stage IC control module and the ground wire in series.

When the lamp is powered on, the anti-ghost module does not influence the normal work of the circuit, after the lamp enters a standby state, the leakage current of the front-stage IC drive module and the leakage current generated by the rear-stage IC control module flow into the ground wire PE through the capacitor CY1, the capacitor CY2, the capacitor CY3, the capacitor CY4 to the inductor L1 and the inductor L2, and the rear-stage LED light source does not flow in current at all, so that the problems of micro-lighting and flashing of the light source module are solved completely.

The above description is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art can make insubstantial changes in the technical scope of the present invention within the technical scope of the present invention, and the actions infringe the protection scope of the present invention are included in the present invention.

Claims (4)

1. A driving circuit for preventing an LED light source from lighting in a standby state, comprising: the LED driving circuit comprises a rectification module, a front-stage IC control module, a ghost fire prevention control module, a rear-stage IC control module and an LED control module;

the output end of the rectification module is connected with a preceding stage IC control module, the preceding stage IC control module is connected with a primary coil of the transformer, and the rear stage IC control module is connected with a secondary coil of the transformer; the output end of the rear-stage IC control module is connected with the LED control module;

the anti-ghost-fire control module is used for connecting the front-stage IC control module and the rear-stage IC control module with the ground wire so as to directly flow the leakage current of the front-stage IC drive module and the leakage current of the rear-stage IC control module into the ground wire in a standby state and reduce the leakage current flowing through the distributed capacitance between the light source and the shell.

2. The driving circuit according to claim 1, wherein the driving circuit is configured to prevent the LED light source from being turned on during standby, and comprises: the anti-ghost-fire module comprises a capacitor CY1, a capacitor CY2 and an inductor L1;

one end of the capacitor CY1 is connected to any one end of the primary coil of the transformer, the other end of the capacitor CY1 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to the ground wire; one end of the capacitor CY2 is connected with any end of the rear-stage IC control module, and the other end of the capacitor CY2 is connected with one end of the inductor L1.

3. The driving circuit according to claim 1, wherein the driving circuit is configured to prevent the LED light source from being turned on during standby, and comprises: the anti-ghost-fire module comprises a capacitor CY1, a capacitor CY2, a capacitor CY3, a capacitor CY4, an inductor L1 and an inductor L2;

one end of the capacitor CY1 is connected to the GND end of the primary coil of the transformer, the other end of the capacitor CY1 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to the ground wire; one end of the capacitor CY3 is connected with the GND end of the rear-stage IC control module, and the other end of the capacitor CY3 is connected with one end of the inductor L1; the inductor L2 is connected in parallel with the inductor L1, the capacitor CY2 is connected in parallel with the capacitor CY1, and the capacitor CY4 is connected in parallel with the capacitor CY 3.

4. The driving circuit according to claim 1, wherein the driving circuit is configured to prevent the LED light source from being turned on during standby, and comprises: the anti-ghost-fire module comprises a capacitor CY1, a capacitor CY2, a capacitor CY3, a capacitor CY4, an inductor L1 and an inductor L2;

the capacitor CY1, the capacitor CY2, the inductor L2 and the inductor L1 are connected between the GND end of the primary coil and the ground wire in series; the capacitor CY4, the capacitor CY3, the inductor L2 and the inductor L1 are connected between the GND end of the rear-stage IC control module and the ground wire in series.

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