CN211047300U

CN211047300U - Multi-path L ED driving circuit

Info

Publication number: CN211047300U
Application number: CN201921557073.5U
Authority: CN
Inventors: 马文波; 李煜; 廖秋荣; 李强
Original assignee: Gelenfi Lighting Ltd
Current assignee: Gelenfi Lighting Ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-07-17
Anticipated expiration: 2029-09-19

Abstract

The application provides a multi-path L ED driving circuit, which comprises a rectifying circuit, a filter circuit, a constant voltage circuit, a first constant current circuit and a second constant current circuit, wherein the rectifying circuit is connected with an alternating current power supply and used for converting alternating current power into direct current power, the filter circuit is connected with the rectifying circuit and used for filtering alternating current components in the direct current power, the constant voltage circuit is connected with the filter circuit and used for generating fixed voltage, a voltage output end is used for outputting the fixed voltage, the voltage output end is used for being connected with first electrodes of two L ED, the first constant current circuit is connected with the constant voltage circuit and a second electrode of one of the two L ED, the second constant current circuit is connected with the constant voltage circuit and a second electrode of the other of the two L ED, and the magnitude of current flowing through the two L ED can be independently controlled through the first constant current circuit and the second constant current circuit.

Description

Multi-path L ED driving circuit

Technical Field

The present application relates to L ED lamps, and more particularly to a drive circuit for L ED lamps.

Background

A L ED filament lamp is formed by connecting a plurality of tiny L ED chips in a linear or curve shape, namely, imitating the shape of a traditional filament, and arranging one or a plurality of L ED filaments in a bulb shell to form a L ED filament lamp like the traditional incandescent bulb.

Most of the conventional L ED filament lamps are formed by connecting a plurality of L ED filaments in parallel, the forward Voltage (VF) value of each L ED filament cannot be completely the same, even IF the filament has the same material and the same luminous color, individual deviation specific to semiconductors exists, the forward current (IF) flowing through each filament is caused by the parallel connection of L ED, the forward current flowing through L ED filament with lower VF value is higher than the forward current flowing through L ED filament with higher VF value, which is also called as a current robbing phenomenon, and slight difference of the forward voltage causes drastic change of the forward current due to VF-IF characteristics of L ED.

The reason why the power of L ED filament lamp is higher, the influence of current robbing phenomenon to the whole quality of lamps is larger is that as the power of light source increases, the number of parallel groups of filaments is more, and the number of parallel groups is more, the probability of current robbing phenomenon is higher, and the current robbing phenomenon is more serious, the current robbing phenomenon will cause the brightness deviation of each filament, and the service life of L ED filament with larger forward current will be shortened due to over-lighting.

To solve this problem, a multi-output driver can be used, as shown in fig. 1, the principle is to arrange two or more independent driving circuits on a single circuit board, and this driver essentially only combines two or more driving circuits together, but it is costly and bulky, and this design can only be applied to external driving lamps (such as L ED fluorescent lamp) at present, while L ED filament lamp has the same shape as the traditional incandescent lamp, and its driver can only be installed in the lamp holder, and its space is very limited, and the multi-output driver power supply shown in fig. 1 in the prior art cannot be installed in the lamp holder for use.

SUMMERY OF THE UTILITY MODEL

Based on the above technical problem, it is a primary objective of the present invention to provide a multi-channel L ED driving circuit, which can be greatly reduced in size and can be applied to a lamp cap of a L ED filament lamp.

To achieve the above object, the present application provides a multi-channel L ED driving circuit, which includes a rectifying circuit, a filter circuit, a constant voltage circuit, a first constant current circuit and a second constant current circuit, wherein the rectifying circuit is connected to an ac power source for converting ac power into dc power, the filter circuit is connected to the rectifying circuit for filtering ac components in the dc power, the constant voltage circuit is connected to the filter circuit for generating a fixed voltage, the fixed voltage is output from a voltage output terminal, the voltage output terminal is connected to first electrodes of two L EDs, the first constant current circuit is connected to the constant voltage circuit and a second electrode of one of the two L EDs, the second constant current circuit is connected to the constant voltage circuit and a second electrode of the other of the two L EDs, and the first constant current circuit and the second constant current circuit enable the magnitude of current flowing through the two L EDs to be independently controlled.

Other features and embodiments of the present application will be described in detail below with reference to the drawings.

Drawings

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

FIG. 1 is a circuit diagram of a prior art multiplexed output driver;

FIG. 2 is a block diagram of the circuit of the present application;

FIG. 3 is a circuit diagram of the present application;

FIG. 4 is a schematic diagram of the overall architecture of the present application as applied to an L ED filament lamp, an

Fig. 5 is a schematic diagram of a filament arrangement as applied to an L ED filament lamp.

Detailed Description

The positional relationship described in the following embodiments includes: the top, bottom, left and right, unless otherwise indicated, are based on the orientation of the elements in the drawings.

Referring to fig. 2, the multi-channel L ED driving circuit of the present application includes an anti-glitch circuit 1, a rectifying circuit 2, a filter circuit 3, a constant voltage circuit 4, a first constant current circuit 51, and a second constant current circuit 52.

The anti-surge circuit 1 is a protection circuit added as a protection circuit against lightning strikes or surges from an external ac power source, and is not directly related to the operation of the L ED driving circuit of the present application, and therefore, it is not necessary to have components, the rectifier circuit 2 is connected to the anti-surge circuit 1 or directly connected to an ac power source for converting ac power from an external ac power source into dc power, the filter circuit 3 is connected to the rectifier circuit 2 for filtering out an ac component (ripple) in the dc power output from the rectifier circuit 2, the constant voltage circuit 4 is connected to the filter circuit 3 for generating a constant voltage output which is output from a voltage output terminal 41, the voltage output terminal 41 is connected to first electrodes of two ED L, 62 as loads, in the illustrated embodiment, the first electrode is a positive electrode, the first constant current circuit 51 is connected to second electrodes of the constant voltage circuit 4 and one of the two ED L, 61,62, the second constant current circuit 52 is connected to the constant voltage circuit 4 and the second electrode of the other one of the two ED L, 61,62, and the second constant current circuit 52 is a positive electrode L which is a negative electrode which is a constant current which is a small constant current control circuit, and a constant current control circuit 52 which is shown in the second constant current control circuit 52.

The embodiment shown in the drawings is exemplified by two loads, and each load is only a single L ED, but not limited thereto, and may be further increased to more than two loads according to actual requirements, and each load may also be a plurality of L EDs connected in series and/or in parallel.

Referring to fig. 3, the L ED driver circuit of the present application is a Boost structure, as shown in the figure, the constant voltage circuit 4 includes a voltage controller IC3, in the illustrated embodiment, a BP2606D integrated circuit manufactured by the crystal tomayu source company is used as the voltage controller IC3, and a fixed voltage is output to the first electrode (positive electrode) of the two loads L ED61,62 through a voltage output terminal 41, the first constant current circuit 51 and the second constant current circuit 52 form an independent branch circuit respectively, each branch circuit includes a current controller IC1, an IC2, in the illustrated embodiment, a BP5616C integrated circuit manufactured by the crystal tomayu source company is used as the current controller IC1, an IC 2.

The voltage controller IC3 includes two voltage detection pins (i.e., OVP pin and FB pin) respectively connected to the high voltage interfaces of the current controller ICs 1 and 2 to provide a sustain voltage to the two current controller ICs 1 and IC2 respectively. The current controller IC1, IC2 can set the output current separately, and is powered by the filter circuit 3, the output current (i.e. load current) of the two branches is controlled by the resistances of the resistors R8 and R9 between the current controller IC1, the CS pin of IC2 and the ground line, when R8 is equal to R9, the two output currents are the same, and the current equalization is realized; when R8 is not equal to R9, the two paths can output currents with different magnitudes.

Referring to fig. 4, in application of L ED filament lamps, the driving circuit of the present application is embedded in the lamp base 7, the positive electrode of the first group of filaments 61 'is electrically connected to the positive electrode terminal L ED + in fig. 3, the negative electrode is electrically connected to the first negative electrode terminal L ED1-, the positive electrode of the second group of filaments 62' is electrically connected to the positive electrode terminal L ED +, and the negative electrode is electrically connected to the second negative electrode terminal L ED2-, each group of filaments 61 ', 62' of the embodiment shown in fig. 4 is composed of two filaments, which may be a single filament.

Referring to fig. 5, the first set of filaments 61 "and the second set of filaments 62" may also be connected in series and/or in parallel via a plurality of filaments, and the number of the filaments connected in series and/or in parallel may be the same or different.

The above-described embodiments and/or implementations are only for illustrating the preferred embodiments and/or implementations of the technology of the present application, and are not intended to limit the implementations of the technology of the present application in any way, and those skilled in the art can make modifications or changes to other equivalent embodiments without departing from the scope of the technology disclosed in the present application, but should be construed as technology or implementations substantially the same as the present application.

Claims

1. A multi-channel L ED driving circuit, comprising:

the rectifying circuit is connected with an alternating current power supply and used for converting alternating current power into direct current power;

a filter circuit connected to the rectifying circuit for filtering out AC component in the DC power;

a constant voltage circuit connected to the filter circuit for generating a constant voltage, the constant voltage being outputted from a voltage output terminal, the voltage output terminal being connected to the first electrodes of the two L ED;

a first constant current circuit connected to the constant voltage circuit and the second electrode of one of the two L EDs, and

a second constant current circuit connected to the constant voltage circuit and the second electrode of the other of the two L ED;

the first constant current circuit and the second constant current circuit enable the magnitude of current flowing through the two L EDs to be independently controlled.

2. The multi-way L ED driver circuit of claim 1, wherein the L ED has a positive first electrode and a negative second electrode.

3. The multi-way L ED driver circuit of claim 1, further comprising an anti-glitch circuit connected between the rectifying circuit and the AC power source.

4. The multi-way L ED driver circuit of claim 1, wherein the constant voltage circuit comprises a voltage controller.

5. The multi-way L ED driver circuit of claim 4, wherein the voltage controller is a BP2606D integrated circuit.

6. The multi-way L ED driving circuit of claim 1, wherein the first constant current circuit and the second constant current circuit each include a current controller.

7. The multi-way L ED driver circuit of claim 6, wherein the current controller is a BP5616C IC.

8. The multi-way L ED driver circuit of claim 6, wherein the current controller is powered by the filter circuit.