CN104994655A - LED constant current driving circuit - Google Patents
LED constant current driving circuit Download PDFInfo
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- CN104994655A CN104994655A CN201510414038.8A CN201510414038A CN104994655A CN 104994655 A CN104994655 A CN 104994655A CN 201510414038 A CN201510414038 A CN 201510414038A CN 104994655 A CN104994655 A CN 104994655A
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Abstract
An LED constant current driving circuit comprises a rectifying and filtering circuit, a voltage stabilizing circuit, a constant current driving circuit, an auxiliary power supply circuit and a load LED circuit which are sequentially connected, wherein the auxiliary power supply circuit is connected with the constant current driving circuit for providing a working power supply for a constant current driving chip in the constant current driving circuit. The LED constant current driving circuit has the beneficial effects that: the auxiliary power supply is additionally arranged for providing power for the constant current driving chip U1, the excessive power consumption of a first MOS transistor Q1 caused when a second MOS transistor Q2 is oscillated and driven by the constant current driving chip U1 in the prior art can be effectively prevented, thereby the circuit can be effectively protected, and the LED constant current driving circuit has good constant current driving effect in practical application.
Description
Technical field
The present invention relates to lighting field, especially a kind of constant current driver circuit for LED.
Background technology
Along with the development of science and technology, LED is as emerging light source, there is the advantages such as volume is little, power consumption is low, optical efficiency is high, the life-span is long, environmental protection, be widely used in lighting field, also there is LED drive circuit miscellaneous thereupon, in actual applications, the drive current of LED light source all has a direct impact luminous efficiency and life-span.LED drive circuit is numerous in the market, but all there is various problem.
Summary of the invention
Technical problem to be solved by this invention is; a kind of constant current driver circuit for LED rational in infrastructure is provided; effectively can prevent constant-current driven chip of the prior art from causing the power consumption of other metal-oxide-semiconductors excessive when vibrating driven MOS pipe, thus effectively circuit be played a protective role.
For solving the problems of the technologies described above, the invention provides a kind of constant current driver circuit for LED, comprising the current rectifying and wave filtering circuit, voltage stabilizing circuit, constant-current drive circuit, auxiliary power circuit, the load LED circuit that connect successively; Auxiliary power circuit is connected with constant-current drive circuit, for the constant-current driven chip in constant-current drive circuit provides working power.
Preferably, current rectifying and wave filtering circuit is made up of the first rectifier bridge BD1 and the second electric capacity C2.
Preferably, voltage stabilizing circuit comprises the first resistance R1, the 3rd electric capacity C3 and the first diode D1.
Preferably, auxiliary power circuit comprises the first electric capacity C1 and the second rectifier bridge BD2.
Preferably, concrete annexation is: the 1 termination AC power AC of the first rectifier bridge BD1, the direct ground connection of 4 end of the first rectifier bridge BD1, connects 2 ends of the second rectifier bridge BD2, ground connection after the 2 termination second electric capacity C2 of the first rectifier bridge BD1 after 3 ends of the first rectifier bridge BD1 connect the first electric capacity C1; The direct ground connection of 1 end of the second rectifier bridge BD2, between 1 end that 4 ends of the second rectifier bridge BD2 are connected on the first rectifier bridge BD1 and AC power AC, 3 ends of the second rectifier bridge BD2 connect ground connection after the 5th resistance R5 and the 4th diode D4 successively, and the 4th electric capacity C4 is connected in parallel on the two ends of the 4th diode D4;
One end of first resistance R1 is connected to 2 ends of the first rectifier bridge BD1, and the other end connects ground connection after the first diode D1, and the 3rd Capacitance parallel connection is at the two ends of the first diode D1;
2 ends of the first rectifier bridge BD1 are connect after the drain electrode of the first metal-oxide-semiconductor Q1 connects the second diode D2, first inductance L 1 connects the anode of LED strip LED1-LED2, the negative electrode of LED strip connects the drain electrode of the first metal-oxide-semiconductor Q1, and the second diode D2, the first inductance L 1 form a loop with LED strip; The grid of the first metal-oxide-semiconductor Q1 is connected between the first resistance R1 and the first diode D1; The source electrode of the first metal-oxide-semiconductor Q1 is connected to the drain electrode of the second metal-oxide-semiconductor Q2; The source electrode of the second metal-oxide-semiconductor Q2 connects ground connection after the 4th resistance R4, and the grid of the second metal-oxide-semiconductor Q2 connects the drive output DRV end of constant-current driven chip U1;
The feedback end CS end of constant-current driven chip U1 connects ground connection after the second resistance R2, the 3rd resistance R3 successively; The earth terminal GND of constant-current driven chip U1 holds direct ground connection; The Enable Pin EN end of constant-current driven chip U1 is connected between the 5th resistance R5 and the 4th diode D4; The power end VCC end of constant-current driven chip U1 is connected to the Enable Pin EN end of constant-current driven chip U1.
Beneficial effect of the present invention is: by additionally increasing accessory power supply for the mode of powering for constant-current driven chip U1; the power consumption of the first metal-oxide-semiconductor Q1 that can effectively prevent constant-current driven chip U1 of the prior art from causing when vibrating driving second metal-oxide-semiconductor Q2 is excessive; thus effective effect circuit being played to protection, there is good constant current in actual applications and drive effect.
Accompanying drawing explanation
Fig. 1 is integrated circuit block diagram of the present invention.
Fig. 2 is integrated circuit structure chart of the present invention.
Embodiment
As Fig. 1, a kind of constant current driver circuit for LED, comprises the current rectifying and wave filtering circuit, voltage stabilizing circuit, constant-current drive circuit, auxiliary power circuit, the load LED circuit that connect successively; Auxiliary power circuit is connected with constant-current drive circuit, for the constant-current driven chip in constant-current drive circuit provides working power.
As shown in Figure 2, current rectifying and wave filtering circuit is made up of the first rectifier bridge BD1 and the second electric capacity C2.Voltage stabilizing circuit comprises the first resistance R1, the 3rd electric capacity C3 and the first diode D1.Auxiliary power circuit comprises the first electric capacity C1 and the second rectifier bridge BD2.
Concrete annexation is: the 1 termination AC power AC of the first rectifier bridge BD1, the direct ground connection of 4 end of the first rectifier bridge BD1,2 ends of the second rectifier bridge BD2 are connect, ground connection after the 2 termination second electric capacity C2 of the first rectifier bridge BD1 after 3 ends of the first rectifier bridge BD1 connect the first electric capacity C1; The direct ground connection of 1 end of the second rectifier bridge BD2, between 1 end that 4 ends of the second rectifier bridge BD2 are connected on the first rectifier bridge BD1 and AC power AC, 3 ends of the second rectifier bridge BD2 connect ground connection after the 5th resistance R5 and the 4th diode D4 successively, and the 4th electric capacity C4 is connected in parallel on the two ends of the 4th diode D4;
One end of first resistance R1 is connected to 2 ends of the first rectifier bridge BD1, and the other end connects ground connection after the first diode D1, and the 3rd Capacitance parallel connection is at the two ends of the first diode D1;
2 ends of the first rectifier bridge BD1 are connect after the drain electrode of the first metal-oxide-semiconductor Q1 connects the second diode D2, first inductance L 1 connects the anode of LED strip LED1-LED2, the negative electrode of LED strip connects the drain electrode of the first metal-oxide-semiconductor Q1, and the second diode D2, the first inductance L 1 form a loop with LED strip; The grid of the first metal-oxide-semiconductor Q1 is connected between the first resistance R1 and the first diode D1; The source electrode of the first metal-oxide-semiconductor Q1 is connected to the drain electrode of the second metal-oxide-semiconductor Q2; The source electrode of the second metal-oxide-semiconductor Q2 connects ground connection after the 4th resistance R4, and the grid of the second metal-oxide-semiconductor Q2 connects the drive output DRV end of constant-current driven chip U1;
The feedback end CS end of constant-current driven chip U1 connects ground connection after the second resistance R2, the 3rd resistance R3 successively; The earth terminal GND of constant-current driven chip U1 holds direct ground connection; The Enable Pin EN end of constant-current driven chip U1 is connected between the 5th resistance R5 and the 4th diode D4; The power end VCC end of constant-current driven chip U1 is connected to the Enable Pin EN end of constant-current driven chip U1.
Although the present invention illustrates with regard to preferred implementation and describes, only it will be understood by those of skill in the art that otherwise exceed claim limited range of the present invention, variations and modifications can be carried out to the present invention.
Claims (5)
1. a constant current driver circuit for LED, is characterized in that, comprises the current rectifying and wave filtering circuit, voltage stabilizing circuit, constant-current drive circuit, auxiliary power circuit, the load LED circuit that connect successively; Auxiliary power circuit is connected with constant-current drive circuit, for the constant-current driven chip in constant-current drive circuit provides working power.
2. constant current driver circuit for LED as claimed in claim 1, it is characterized in that, described current rectifying and wave filtering circuit is made up of the first rectifier bridge BD1 and the second electric capacity C2.
3. constant current driver circuit for LED as claimed in claim 1, it is characterized in that, described voltage stabilizing circuit comprises the first resistance R1, the 3rd electric capacity C3 and the first diode D1.
4. constant current driver circuit for LED as claimed in claim 1, it is characterized in that, described auxiliary power circuit comprises the first electric capacity C1 and the second rectifier bridge BD2.
5. constant current driver circuit for LED as claimed in claim 1, it is characterized in that, the concrete annexation of described constant current driver circuit for LED is: the 1 termination AC power AC of the first rectifier bridge BD1, the direct ground connection of 4 end of the first rectifier bridge BD1,2 ends of the second rectifier bridge BD2 are connect, ground connection after the 2 termination second electric capacity C2 of the first rectifier bridge BD1 after 3 ends of the first rectifier bridge BD1 connect the first electric capacity C1; The direct ground connection of 1 end of the second rectifier bridge BD2, between 1 end that 4 ends of the second rectifier bridge BD2 are connected on the first rectifier bridge BD1 and AC power AC, 3 ends of the second rectifier bridge BD2 connect ground connection after the 5th resistance R5 and the 4th diode D4 successively, and the 4th electric capacity C4 is connected in parallel on the two ends of the 4th diode D4;
One end of first resistance R1 is connected to 2 ends of the first rectifier bridge BD1, and the other end connects ground connection after the first diode D1, and the 3rd Capacitance parallel connection is at the two ends of the first diode D1;
2 ends of the first rectifier bridge BD1 are connect after the drain electrode of the first metal-oxide-semiconductor Q1 connects the second diode D2, first inductance L 1 connects the anode of LED strip LED1-LED2, the negative electrode of LED strip connects the drain electrode of the first metal-oxide-semiconductor Q1, and the second diode D2, the first inductance L 1 form a loop with LED strip; The grid of the first metal-oxide-semiconductor Q1 is connected between the first resistance R1 and the first diode D1; The source electrode of the first metal-oxide-semiconductor Q1 is connected to the drain electrode of the second metal-oxide-semiconductor Q2; The source electrode of the second metal-oxide-semiconductor Q2 connects ground connection after the 4th resistance R4, and the grid of the second metal-oxide-semiconductor Q2 connects the drive output DRV end of constant-current driven chip U1;
The feedback end CS end of constant-current driven chip U1 connects ground connection after the second resistance R2, the 3rd resistance R3 successively;
The earth terminal GND of constant-current driven chip U1 holds direct ground connection; The Enable Pin EN end of constant-current driven chip U1 is connected between the 5th resistance R5 and the 4th diode D4; The power end VCC end of constant-current driven chip U1 is connected to the Enable Pin EN end of constant-current driven chip U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510414038.8A CN104994655A (en) | 2015-07-14 | 2015-07-14 | LED constant current driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510414038.8A CN104994655A (en) | 2015-07-14 | 2015-07-14 | LED constant current driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104994655A true CN104994655A (en) | 2015-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510414038.8A Pending CN104994655A (en) | 2015-07-14 | 2015-07-14 | LED constant current driving circuit |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005259565A (en) * | 2004-03-12 | 2005-09-22 | Matsushita Electric Ind Co Ltd | Led driving circuit |
| CN104168696A (en) * | 2014-07-31 | 2014-11-26 | 罗吉国 | Compatible LED power circuit |
-
2015
- 2015-07-14 CN CN201510414038.8A patent/CN104994655A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005259565A (en) * | 2004-03-12 | 2005-09-22 | Matsushita Electric Ind Co Ltd | Led driving circuit |
| CN104168696A (en) * | 2014-07-31 | 2014-11-26 | 罗吉国 | Compatible LED power circuit |
Non-Patent Citations (2)
| Title |
|---|
| 中国LED网论坛: "《球泡灯非隔离型恒流驱动模块-QX9920》", 17 June 2013 * |
| 王文江，吴勇灵，杨洁: "常用大功率LED灯恒流驱动IC QX9910典型应用电路的改进", 《灯与照明》 * |
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Application publication date: 20151021 |
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| RJ01 | Rejection of invention patent application after publication |