CN202374520U

CN202374520U - Light-emitting diode (LED) power source circuit of direct current (DC)-DC constant current module

Info

Publication number: CN202374520U
Application number: CN2011205196848U
Authority: CN
Inventors: 叶国华
Original assignee: SHENZHEN GUOWEIYUAN TECHNOLOGY Co Ltd
Current assignee: SHENZHEN GUOWEIYUAN TECHNOLOGY Co Ltd
Priority date: 2011-12-12
Filing date: 2011-12-12
Publication date: 2012-08-08
Anticipated expiration: 2021-12-12

Abstract

The utility model provides a light-emitting diode (LED) power source circuit of a direct current (DC)-DC constant current module, which comprises an alternating current (AC) input end, an AC-DC power source conversion module, a DC connection line, a constant current control module, an LED connection line and an LED lamp which are all electrically connected in sequence. The AC-DC power source conversion module and the constant current control module are mutually independent circuits and are electrically connected through the DC connection line. Further, the constant current control module is an independent device assembled by multi-path DC-DC constant current control modules. In the mechanical aspect, the constant current control module and the AC-DC power source conversion module are mutually independent structures or are assembled together. In the practical application, the LED power source circuit of the DC-DC constant current module can conveniently increase or reduce modules, and has the advantages of being simple e in operation of multi-path constant current output control LED lighting application, low in cost and high in reliability.

Description

DC-DC constant current module LED power circuit

Technical field

The utility model relates to a kind of DC-DC constant current control die set LED power circuit; Be that multichannel (more than two tunnel) LED constant-current source controller is formed control die set through independent design; Realize power supply and the control method that module separates, reach and use flexibly effect easy for installation.

Background technology

Along with the development of LED technology, because the advantage of its energy-conserving and environment-protective, long service life has the trend that replaces conventional light source gradually.In the existing LED lighting field, multichannel DC-DC constant-current source all designs at the AC-DC power supply inner, is integrated with the AC-DC power panel, brought operational trouble for the different output group road of demand, and use is inconvenient, cost is high, space hold is big.

The utility model content

The utility model promptly is to the problems referred to above that exist in the LED lighting circuit; Design a kind of LED multichannel DC-DC output module power supply, described module power supply independent design, can separate or be combined in same power supply with the AC-DC power supply inner; But circuit part is independently of one another; This mode can arbitrarily increase (more than two tunnel) DC-DC output module, under different demands, all can meet the requirements, and operability is convenient.

The mentality of designing of the utility model is that multichannel DC-DC constant current control die set is separated with the AC-DC power supply; Independent design becomes a module; This module can stand-alone shell design, also can individual module and AC-DC power pack be fitted together, when the different output group road of demand; The individual module that can increase or reduce this module gets final product, and practicality is high.

Specifically; The described DC-DC constant current of the utility model module LED power circuit; Comprise the AC input, AC-DC power transfer module, DC connecting line, constant current control die set, LED connecting line and the LED light fixture that electrically connect successively; AC-DC power transfer module and constant current control die set are separate circuit, between electrically connect through the DC connecting line.

Further, described constant current control die set is to be assembled into a self-contained unit by multichannel DC-DC constant current control module.

Further, described constant current control die set and AC-DC power transfer module mechanically are separate structure.

Further, it is inner that described constant current control die set and AC-DC power transfer module mechanically are assembled in the AC-DC modular converter.

Further, described constant current control die set comprises enhancement mode n-MOSFET constant-current source circuit or BJT constant-current source circuit.

Basic constant-current source circuit mainly is to be made up of input stage and output stage, and input stage provides reference current, the constant current that output stage output needs.

In the enhancement mode n-MOSFET constant-current source circuit, stable for the gate source voltage that guarantees output transistor T2, its front just should be provided with a constant pressure source; In fact; The T1 diode just for a stable gate source voltage is provided to T2, promptly play a part a constant pressure source, so T1 should have very little conductance for alternating current and higher mutual conductance in this effect; To guarantee that it has constant voltage performance preferably; T2 should have very big output AC resistance, just needs to adopt long channel MOS FET for this reason, and will reduce harmful effect such as channel length modulation effect.In the basic constant-current source circuit of BJT, T2 is the transistor of output constant current, and transistor T 1 is exactly one provides the emitter junction of stablize base voltage diode to T2, and certainly, the current amplification factor of T1 is bigger, mutual conductance is high more, and then its constant voltage performance is also just good more.Simultaneously, for output current constant (promptly improving output AC resistance), also need reduce the base width modulation effect (being the Early effect) of T2 naturally as far as possible.In addition; If the p-n-p transistor that adopts two base stages to be connected constitutes constant-current source; These two transistors can be placed in the same isolated area in the IC chip so; This will help reducing chip area, but in order to obtain the constant performance of output current preferably, promptly pay particular attention to the transistorized current amplification factor of the horizontal p-n-p of increase.

The described DC-DC constant current of the utility model module LED power circuit can increase in practical application and the minimizing module easily, has advantage simple to operate, low-cost to multiple constant current output control LED illumination application, that reliability is high.

Description of drawings

Fig. 1 is the schematic block circuit diagram of the said circuit of the utility model;

Fig. 2 is the circuit diagram of an embodiment of the said circuit of the utility model;

Fig. 3 is the circuit diagram of another embodiment of the said circuit of the utility model.

Embodiment

Below in conjunction with accompanying drawing, the described DC-DC constant current of the utility model module LED power circuit to be described, purpose is better to understand described technology contents for the public; Rather than to the restriction of said technology contents, in fact, with identical or approximate principle; The improvement that said circuit is carried out; Comprising replacement, the increase and decrease of respective element, is purpose to realize essentially identical effect, then all within the utility model technical scheme required for protection.

As shown in Figure 1; The described DC-DC constant current of the utility model module LED power circuit; Comprise successively the AC input, AC-DC power transfer module, DC connecting line, constant current control die set, LED connecting line and the LED light fixture that electrically connect, AC-DC power transfer module and constant current control die set are separate circuit, between through the electric connection of DC connecting line; Further, described constant current control die set is to be assembled into a self-contained unit by multichannel DC-DC constant current control module.

Like Fig. 2; Described constant current control die set and AC-DC power transfer module mechanically are separate structure; Be a kind of application mode that AC-DC power transfer module and DC-DC constant current control module are independently separated, can power supply and constant current control die set be separated assembling according to the application scenario.

Like Fig. 3; It is inner that described constant current control die set and AC-DC power transfer module mechanically are assembled in the AC-DC modular converter; AC-DC modular converter and DC-DC constant current control module are assembled in same shell or the device, can power supply and DC-DC constant current module group be assembled in same casing or the device together according to the application scenario.

Further, described constant current control die set comprises general enhancement mode n-MOSFET constant-current source circuit or BJT constant-current source circuit.

Claims

1. DC-DC constant current module LED power circuit; It is characterized in that: described power circuit comprises AC input, AC-DC power transfer module, DC connecting line, constant current control die set, LED connecting line and the LED light fixture that electrically connects successively; AC-DC power transfer module and constant current control die set are separate circuit, between electrically connect through the DC connecting line.

2. power circuit according to claim 1 is characterized in that: described constant current control die set is to be assembled into a self-contained unit by multichannel DC-DC constant current control module.

3. power circuit according to claim 1 and 2 is characterized in that: described constant current control die set and AC-DC power transfer module mechanically are separate structure.

4. power circuit according to claim 1 and 2 is characterized in that: it is inner that described constant current control die set and AC-DC power transfer module mechanically are assembled in the AC-DC modular converter.

5. power circuit according to claim 1 is characterized in that: described constant current control die set comprises enhancement mode n-MOSFET constant-current source circuit or BJT constant-current source circuit.