CN203775459U - LED driver convenient to adjust output current - Google Patents
LED driver convenient to adjust output current Download PDFInfo
- Publication number
- CN203775459U CN203775459U CN201320863003.9U CN201320863003U CN203775459U CN 203775459 U CN203775459 U CN 203775459U CN 201320863003 U CN201320863003 U CN 201320863003U CN 203775459 U CN203775459 U CN 203775459U
- Authority
- CN
- China
- Prior art keywords
- sampling resistor
- led driver
- output current
- control loop
- sampling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Led Devices (AREA)
Abstract
The utility model discloses an LED driver convenient to adjust an output current. The LED driver includes an input interface, a filtering unit, a first rectification and smoothing unit, a switching tube, a control loop, a transformer, a second rectification and smoothing unit and an output interface, wherein the input interface, the filtering unit, the first rectification and smoothing unit, the transformer, the second rectification and smoothing unit and the output interface are connected in sequence, the control loop is connected with the switching tube and the transformer, the switching tube is connected with the transformer, the control loop includes a first sampling resistor used for providing a sampling current for a controller in the control loop, and the control loop also at least includes a second sampling resistor which is associated with the first sampling resistor to change the sampling current. The LED driver convenient to adjust the output current that the utility model relates to prevents the sampling resistors from being replaced by a manual method, and the operation of adjusting the output current of the LED driver is simple, convenient and rapid, thereby facilitating mass production of LED drivers.
Description
Technical field
The utility model relates to LED lighting field, relates in particular to a kind of LED driver of being convenient to adjust output current.
Background technology
The LED illumination that is called as third generation illumination is in the develop rapidly stage, increasing at the proportion of lighting field.Different with traditional lighting, general LED lighting adopts the Switching Power Supply driver of constant-current type to carry out driving LED light source.This has higher required precision with regard to having caused to the output current of LED driver.
The components and parts that use due to LED driver have certain trueness error scope, and it can have influence on the current precision of LED driver.When the current precision of LED driver goes beyond the scope, general solution is to adopt manual type to change sampling resistor with electric iron to adjust output current in the prior art.
The defect of such scheme is:
(1) first, use electric iron to change sampling resistor, waste time and energy, be unfavorable for the mass production of LED driver;
(2) secondly, soldering surface mounted sampling resistor is had relatively high expectations to welding technical ability, and the solder technology of the workman on general LED light fixture assembly line does not reach requirement, and artificial welding easily causes the rosin joint of sampling resistor, affects properties of product;
(3) last, electric iron in use has the hidden danger of electric leakage or static, easily causes on LED driver the breakage of other sensitive components bad.
Utility model content
The purpose of this utility model is to provide a kind of LED driver of being convenient to adjust output current, to avoid adopting manual type to change sampling resistor, adjusts the simple and convenient of LED driver output current, is conducive to the mass production of LED driver.
For achieving the above object, the utility model proposes a kind of LED driver of being convenient to adjust output current, comprise input interface, filter unit, the first rectification smooth unit, switching tube, control loop, transformer, the second rectification smooth unit and output interface, wherein said input interface, filter unit, the first rectification smooth unit, transformer, the second rectification smooth unit and output interface are connected successively, described control loop is connected with switching tube and transformer, described switching tube is connected with described transformer, described control loop comprises the first sampling resistor, be used to the controller in described control loop that sample rate current is provided, described control loop also at least comprises the second sampling resistor, it is associated with described the first sampling resistor, to change sample rate current.
Preferably, described the second sampling resistor is configured to be connected in parallel with described the first sampling resistor.
Preferably, described the second sampling resistor is configured to be connected in series with described the first sampling resistor.
Preferably, described control loop also comprises the 3rd sampling resistor, and wherein said the second sampling resistor is configured to be connected in series with described the first sampling resistor, and described the 3rd sampling resistor is configured to be connected in parallel with described the first sampling resistor.
The beneficial effects of the utility model are, by the sampling resistor of increase being connected with original sampling resistor and/or parallel connection, realized and avoided adopting manual type to change sampling resistor, adjusted the simple and convenient of LED driver output current, be conducive to the mass production of LED driver.
Accompanying drawing explanation
Fig. 1 shows the function modoularization schematic diagram of LED driver of the prior art.
Fig. 2 shows the sampling resistor circuit diagram of LED driver in the first embodiment.
Fig. 3 shows the sampling resistor circuit diagram of LED driver in the second embodiment.
Fig. 4 shows the sampling resistor circuit diagram of LED driver in the 3rd embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
As shown in Figure 1, LED driver of the prior art comprises input interface 10, filter unit 20, the first rectification smooth unit 30, switching tube 40, control loop 50, transformer 60, the second rectification smooth unit 70 and output interface 80.
In the actual course of work, input interface 10 connects externally fed equipment, for example, be connected to commercial power interface; The inner high-frequency electromagnetic interference signal producing of filter unit 20 filtering LED drivers; The first rectification smooth unit 30 converts the input power supply via input interface 10 to direct current by alternating current; Control loop 50 is for conducting and the shutoff of control switch pipe 40; The conducting of switching tube 40 and the cycle of shutoff are very short, and generally in tens microsecond left and right, it is for control transformer 60 work; Transformer 60 is for carrying out the conversion of voltage; The second rectification smooth unit 70 converts the alternating voltage after transformer 60 conversions to direct current and is delivered to output interface 80; Output interface 80 is connected to LED load.
Concrete, the output current of the LED driver sampling resistor that the current sample pin CS of control chip 501 connects in control loop 50 is conventionally adjusted, and sampling resistor and output current are inversely proportional to.In the prior art, it is the control chips such as BP3122, BP3309 that control chip 501 adopts model conventionally, and the current sample pin CS of described control chip generally only connects a sampling resistor.Divide three kinds of situations to adjust the output current of LED driver below.
Embodiment 1: sampling resistor is in parallel
As shown in Figure 2, the present embodiment is on the basis of existing technology, by increasing the mode of sampling resistor, the sampling resistor of increase and original sampling resistor are formed to the output current that parallel circuits is adjusted LED driver, newly-increased two sampling resistors in the present embodiment, increase the second sampling resistor R2 and the 3rd sampling resistor R3 and the first sampling resistor R1 and form parallel circuits.Concrete, the resistance of selected the first sampling resistor R1, the minus deviation limit value of the output current value of the corresponding LED driver of this resistance in predetermined current value, the scope 350 ± 5mA of output current for example, output current value corresponding to the resistance of the first sampling resistor R1 is 345mA.After the resistance of selected the first sampling resistor R1, according to the scope of output current, extrapolate the resistance of the second sampling resistor R2 and the 3rd sampling resistor R3, after the resistance of selected good above-mentioned three sampling resistors, one end of the first sampling resistor R1 is directly connected with the current sample pin CS of control chip 501, one end of the second sampling resistor R2 can be connected to by the first short-circuit block J1 the current sample pin CS of control chip 501, one end of the 3rd sampling resistor R3 can be connected to by the second short-circuit block J2 the current sample pin CS of control chip 501, the other end ground connection of above-mentioned three sampling resistors.
The output current of the LED driver going out when actual production is during lower than above-mentioned scope, can the second sampling resistor R2 and/or the 3rd sampling resistor R3 be incorporated in circuit by the first short-circuit block J1 and/or the second short-circuit block J2, reduce total resistance of sampling resistor, and then increase the value of output current.
Embodiment 2: sampling resistor series connection
As shown in Figure 3, the present embodiment is on the basis of existing technology, by increasing the mode of sampling resistor, the sampling resistor of increase and original sampling resistor are formed to the output current that series circuit is adjusted LED driver, newly-increased two sampling resistors in the present embodiment, increase the 5th sampling resistor R5 and the 6th sampling resistor R6 and the 4th sampling resistor R4 and form series circuit.Concrete, the resistance of selected the 4th sampling resistor R4, the overgauge limit value of the output current value of the corresponding LED driver of this resistance in predetermined current value, the scope 350 ± 5mA of output current for example, output current value corresponding to the resistance of the 4th sampling resistor R4 is 355mA.After the resistance of selected the 4th sampling resistor R4, according to the scope of output current, extrapolate the resistance of the 5th sampling resistor R5 and the 6th sampling resistor R6, after the resistance of selected good above-mentioned three sampling resistors, above-mentioned three sampling resistors are connected in series, and one end of series circuit are connected to the current sample pin CS of control chip 501, other end ground connection, by the 3rd short-circuit block J3 short circuit for the 5th sampling resistor R5, and by the 4th short-circuit block J4 short circuit for the 6th sampling resistor R6.
The output current of the LED driver going out when actual production is during higher than above-mentioned scope, can be by removing the mode of the 3rd short-circuit block J3 and/or the 4th short-circuit block J4, the 5th sampling resistor R5 and/or the 6th sampling resistor R6 are sealed in circuit, increase total resistance of sampling resistor, and then reduce the value of output current.
Embodiment 3: sampling resistor connection in series-parallel
As shown in Figure 4, the present embodiment is on the basis of existing technology, by increasing the mode of sampling resistor, the sampling resistor of increase and original sampling resistor are formed to the output current that series-parallel circuit is adjusted LED driver, newly-increased two sampling resistors in the present embodiment, increase the 8th sampling resistor R8 and the 9th sampling resistor R9 and the 7th sampling resistor R7 and form series-parallel circuit.Concrete, the resistance of selected the 7th sampling resistor R7, the output current value of the corresponding LED driver of this resistance is in predetermined current value, the scope 350 ± 5mA of output current for example, output current value corresponding to the resistance of the 7th sampling resistor R7 is 350mA.After the resistance of selected the 7th sampling resistor R7, according to the scope of output current, extrapolate the resistance of the 8th sampling resistor R8 and the 9th sampling resistor R9, after the resistance of selected good above-mentioned three sampling resistors, the 8th sampling resistor R8 and the 7th sampling resistor R7 are connected in series, wherein by the 5th short-circuit block J5 short circuit for the 8th sampling resistor R8, and one end of series circuit is connected to the current sample pin CS of control chip 501, other end ground connection, one end of the 9th sampling resistor R9 can be connected to by the 6th short-circuit block J6 the current sample pin CS of control chip 501, other end ground connection.
The output current of the LED driver going out when actual production during higher than above-mentioned scope, can seal in the 8th sampling resistor R8 in circuit by removing the mode of the 5th short-circuit block J5, increases total resistance of sampling resistor, and then reduces the value of output current; The output current of the LED driver going out when actual production during lower than above-mentioned scope, can pass through the 6th short-circuit block J6, and the 9th sampling resistor R9 is incorporated in circuit, reduces total resistance of sampling resistor, and then increases the value of output current
The LED driver that the utility model is related is convenient to adjust output current has avoided employing manual type to change sampling resistor, adjusts the simple and convenient of LED driver output current, is conducive to the mass production of LED driver.
Claims (4)
1. a LED driver of being convenient to adjust output current, comprise input interface, filter unit, the first rectification smooth unit, switching tube, control loop, transformer, the second rectification smooth unit and output interface, wherein said input interface, filter unit, the first rectification smooth unit, transformer, the second rectification smooth unit and output interface are connected successively, described control loop is connected with switching tube and transformer, described switching tube is connected with described transformer, described control loop comprises the first sampling resistor, be used to the controller in described control loop that sample rate current is provided, it is characterized in that: described control loop also at least comprises the second sampling resistor, it is associated with described the first sampling resistor, to change sample rate current.
2. the LED driver of being convenient to adjust output current according to claim 1, is characterized in that: described the second sampling resistor is configured to be connected in parallel with described the first sampling resistor.
3. the LED driver of being convenient to adjust output current according to claim 1, is characterized in that: described the second sampling resistor is configured to be connected in series with described the first sampling resistor.
4. the LED driver of being convenient to adjust output current according to claim 1, it is characterized in that: described control loop also comprises the 3rd sampling resistor, wherein said the second sampling resistor is configured to be connected in series with described the first sampling resistor, and described the 3rd sampling resistor is configured to be connected in parallel with described the first sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320863003.9U CN203775459U (en) | 2013-12-25 | 2013-12-25 | LED driver convenient to adjust output current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320863003.9U CN203775459U (en) | 2013-12-25 | 2013-12-25 | LED driver convenient to adjust output current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203775459U true CN203775459U (en) | 2014-08-13 |
Family
ID=51292599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320863003.9U Expired - Fee Related CN203775459U (en) | 2013-12-25 | 2013-12-25 | LED driver convenient to adjust output current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203775459U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467232A (en) * | 2014-09-10 | 2016-04-06 | 神讯电脑(昆山)有限公司 | Test circuit for converter |
| CN106199461A (en) * | 2016-07-21 | 2016-12-07 | 卫斌鹏 | A kind of LED lamp source test circuit |
| CN109152153A (en) * | 2018-10-16 | 2019-01-04 | 湖北华中光电科技有限公司 | A kind of LED drive circuit and control method of current adjustment |
-
2013
- 2013-12-25 CN CN201320863003.9U patent/CN203775459U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467232A (en) * | 2014-09-10 | 2016-04-06 | 神讯电脑(昆山)有限公司 | Test circuit for converter |
| CN105467232B (en) * | 2014-09-10 | 2018-04-20 | 神讯电脑(昆山)有限公司 | The test circuit of converter |
| CN106199461A (en) * | 2016-07-21 | 2016-12-07 | 卫斌鹏 | A kind of LED lamp source test circuit |
| CN109152153A (en) * | 2018-10-16 | 2019-01-04 | 湖北华中光电科技有限公司 | A kind of LED drive circuit and control method of current adjustment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203775459U (en) | LED driver convenient to adjust output current | |
| CN201594938U (en) | LED drive circuit | |
| CN102595717B (en) | Protection circuit of light-emitting diode (LED) lamp driving power supply and LED lamp driving power supply | |
| CN203279255U (en) | Drive circuit of LED fluorescent lamp | |
| CN205213087U (en) | Novel high -voltage line nature of can adjusting luminance LED drive power supply | |
| CN201995170U (en) | Large power light-emitting diode (LED) constant power source | |
| CN203541785U (en) | Low-voltage intelligent fast electric soldering iron controlled by single-chip microcomputer | |
| CN202035201U (en) | LED (light-emitting diode) energy-saving lamp integration module | |
| CN205149634U (en) | Electrical power generating system suitable for locomotive lighting device | |
| CN204465952U (en) | A kind of LED energy-saving circuit based on MSP430 | |
| CN203679477U (en) | Constant-temperature control circuit for internal heating electric soldering iron | |
| CN103199831A (en) | Electric heating interval control device | |
| CN103105555B (en) | Aging of product proving installation | |
| CN207824141U (en) | Intelligent digital Width funtion welding machine | |
| CN202949595U (en) | Light-emitting diode (LED) driving circuit | |
| CN202565524U (en) | Electrolytic capacitor-free power source driver for LED lamp | |
| CN206258566U (en) | A kind of equipment of quick test LED lamp bead | |
| CN207266340U (en) | Without stroboscopic LED light adjusting circuits | |
| CN203072219U (en) | LED driving power supply | |
| CN202269050U (en) | LED fluorescent lamp driver with high power factor | |
| CN204350406U (en) | A kind of isolation drive power supply of LED illumination lamp | |
| CN204539573U (en) | A kind of LED light modulation toning circuit | |
| CN103369792A (en) | LED drive circuit | |
| CN201105352Y (en) | Voltage-controlled power source used for electric soldering iron | |
| CN204231705U (en) | A kind of LED intelligent dimming drive and control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: LED driver convenient to adjust output current Effective date of registration: 20150805 Granted publication date: 20140813 Pledgee: The Agricultural Bank of Jiaxing branch of Limited by Share Ltd China garshin Pledgor: Zhejiang Guanghui Lighting Electronics Co., Ltd. Registration number: 2015990000643 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20161225 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |