CN204836726U - High -efficient LED lamp driving circuit - Google Patents
High -efficient LED lamp driving circuit Download PDFInfo
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- CN204836726U CN204836726U CN201520627794.4U CN201520627794U CN204836726U CN 204836726 U CN204836726 U CN 204836726U CN 201520627794 U CN201520627794 U CN 201520627794U CN 204836726 U CN204836726 U CN 204836726U
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- 230000003750 conditioning effect Effects 0.000 description 3
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- 230000007613 environmental effect Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
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- 238000004134 energy conservation Methods 0.000 description 1
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Abstract
The utility model provides a high -efficient LED lamp driving circuit, includes rectifier circuit, current -limiting resistor, driver chip, filter capacitance, energy storage inductance, bypass filter capacitance, overvoltage protection resistance and sampling resistor, rectifier circuit's input termination commercial power, rectifier circuit's the anodal of output is connected to the driver chip power end through current -limiting resistor all the way, and another way is anodal continuous with filter capacitance's one end and LED lamp, filter capacitance's the other end links to each other with the negative pole of LED lamp and the one end of energy storage inductance respectively, the energy storage inductance other end is connected to driver chip's drive end, bypass filter capacitance connects between driver chip's power end and ground, the overvoltage protection ohmic connection is not between driver chip's open circuit protection end and ground, the sampling resistor is connected between driver chip's current sample end and ground. Make power efficiency can reach more than 94%, dissipation power is low, and the life of LED lamp is longer, and the light efficiency is higher.
Description
Technical field
The utility model relates to field of lamp illumination, is specifically related to a kind of High-efficiency LED lamp drive circuit.
Background technology
LED Novel electric light source development make rapid progress, because it is compared with conventional incandescent electricity-saving lamp, have energy-conservation, long-lived, the response time is short, the features such as environmental protection, is widely used in the industries such as illuminating industry, display screen industry, automobile lamp, traffic light fixture.Especially at illuminating industry, along with every country more and more payes attention to lighting energy saving and environmental issue, carrying out energetically using LED lamp.
Traditional LED lamp power supply, the power-efficient of its isolation is 85%-87%, and the power-efficient 88%-92% of non-isolated, the electricity consumption service efficiency of LED is low, and the light efficiency of light fixture is just low, causes the waste of electric energy.Compared with high-efficiency energy-saving LED lamp, at the bottom of luminous flux.
Utility model content
The problems referred to above that the utility model exists to solve prior art, provide a kind of High-efficiency LED lamp drive circuit, the power-efficient of drive circuit can reach more than 94%, and dissipation power is low, and the longer service life of LED, light efficiency is higher.
For achieving the above object, the utility model provides a kind of High-efficiency LED lamp drive circuit, comprise rectification circuit, current-limiting resistance, driving chip, filter capacitor, energy storage inductor, bypass filter capacitor, overvoltage protection resistance and sampling resistor, the input termination civil power of described rectification circuit, the positive pole of the output of described rectification circuit is leaded up to current-limiting resistance and is connected to driving chip power end, one end and the LED positive pole of another road and filter capacitor are connected, the other end of described filter capacitor is connected with one end of energy storage inductor with the negative pole of LED respectively, the described energy storage inductor other end is connected to the drive end of driving chip, described bypass filter capacitor is connected between the power end of driving chip and ground, described overvoltage protection resistance is connected between the open-circuit-protection end of driving chip and ground, described sampling resistor is connected between the current sample end of driving chip and ground.
As optimal technical scheme of the present utility model, described driving chip is high accuracy voltage-dropping type LED drive chip, and model is BP2832A.
As optimal technical scheme of the present utility model, the bridge circuit that described rectification circuit is made up of four antiparallel diodes, the output of described bridge circuit is also connected to source filter capacitor, described active power filtering electric capacity is large electrochemical capacitor, and the current output terminal of described bridge rectifier is connected with the positive pole of large electrochemical capacitor.
As optimal technical scheme of the present utility model, the input of described rectification circuit is also connected to fuse, and described fuse is serially connected in L phase line.
As optimal technical scheme of the present utility model, described current-limiting resistance is made up of the first resistance parallel with one another and the second resistance.
As optimal technical scheme of the present utility model, described sampling resistor is made up of the 3rd resistance of mutually connecting and the 4th resistance.
As optimal technical scheme of the present utility model, described LED lamp drive circuit is also provided with Schottky diode, the input of described Schottky diode is connected with the drive end of driving chip, and the output of described Schottky diode is connected with the positive pole of the LED of driving chip.
High-efficiency LED lamp drive circuit of the present utility model can reach following beneficial effect:
1, power utilization efficiency is high, dissipation power is low;
2, critical current mode pattern, without the need to auxiliary winding and power supply;
3, the ultralow operating current of chip, wide input voltage, ± 5%LED output current precision;
4, chip internal set thermal conditioning temperature spot is 150 DEG C.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the circuit diagram of the utility model High-efficiency LED lamp drive circuit.
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
High-efficiency LED lamp drive circuit as shown in Figure 1, comprise rectification circuit, current-limiting resistance, driving chip U1, filter capacitor C3, energy storage inductor L1, bypass filter capacitor C2, overvoltage protection resistance R5 and sampling resistor, the input termination civil power of described rectification circuit, the positive pole of the output of described rectification circuit is leaded up to current-limiting resistance and is connected to driving chip U1 power end, one end and the LED positive pole of another road and filter capacitor C3 are connected, the other end of described filter capacitor C3 is connected with one end of energy storage inductor L1 with the negative pole of LED respectively, the described energy storage inductor L1 other end is connected to the drive end of driving chip U1, between the power end that described bypass filter capacitor C2 is connected to driving chip U1 and ground, described overvoltage protection resistance R5 is connected between the open-circuit-protection end of driving chip U1 and ground, described sampling resistor is connected between the current sample end of driving chip U1 and ground.
In concrete enforcement, described driving chip U1 is high accuracy voltage-dropping type LED drive chip U1, and model is BP2832A.The bridge circuit BD1 that described rectification circuit is made up of four antiparallel diodes, the output of described bridge circuit BD1 is also connected to source filter capacitor, described active power filtering electric capacity is large electrochemical capacitor C1, and the current output terminal of described bridge rectifier BD1 is connected with the positive pole of large electrochemical capacitor C1.
In concrete enforcement, the input of described rectification circuit is also connected to fuse F1, and described fuse F1 is serially connected in L phase line.
In concrete enforcement, described current-limiting resistance is made up of the first resistance R1 parallel with one another and the second resistance R2.Described sampling resistor is made up of the 3rd resistance R3 mutually connected and the 4th resistance R4.
Preferably, described LED lamp drive circuit is also provided with Schottky diode D1, and the input of described Schottky diode D1 is connected with the drive end of driving chip U1, and the output of described Schottky diode D1 is connected with the positive pole of the LED of driving chip U1.
In order to allow those skilled in the art understand better and to realize the technical solution of the utility model in detail, using method of the present utility model is described in detail below.
LED constant current driving chip adopts BP2832A high accuracy voltage-dropping type LED drive chip, be a kind of power supply for power supply high efficiency and the LED illumination constant-current driven chip of a kind of high property/valency ratio that provides, the power-efficient of LED can be made to reach more than 94%, dissipation power is low, life-span is longer, and light efficiency is higher.
BP2832A is a high accuracy voltage-dropping type LED constant current driving chip.Chip operation, at critical current mode continuous mode, is applicable to the non-isolated voltage-dropping type LED constant current power supply of 85Vac ~ 265Vac gamut input voltage.
The integrated 500V power switch of BP2832A chip internal, adopt driving and the current detecting mode of patent, the operating current of chip is extremely low, detect and power supply without the need to auxiliary winding, only need little peripheral cell, excellent constant-current characteristics can be realized, saved system cost and volume greatly.
With high-precision current sampling circuit in BP2832A chip, have employed the current constant control technology of patent simultaneously, realize high-precision LED constant current and export and excellent line voltage regulation.Chip operation is in critical current mode pattern, and output current does not change with the change of inductance value and LED operating voltage, realizes excellent load regulation.BP2832A has multiple protection functions, comprises LED open circuit/short-circuit protection, and CS resistive short is protected, and under-voltage protection, chip temperature crosses thermal conditioning etc.
BP2832A chip pin illustrates:
| Number of pins | Pin title | Describe |
| 1 | GND | Chip ground |
| 2 | ROVP | Open-circuit-protection voltage-regulation end |
| 3 | NC | Without connecting, suggestion connects chip ground |
| 4 | VCC | Chip power |
| 5、6 | DRAIN | Internal high pressure power tube drains |
| 7、8 | CS | Electric current adopts end |
After system electrification, busbar voltage is by starting resistance to VCC capacitor charging, and when VCC voltage reaches chip unlatching threshold value, chip internal control circuit is started working.The built-in 17V voltage-stabiliser tube of BP2832A, for clamper VCC voltage.When chip normally works, the VCC electric current of needs is extremely low, so without the need to auxiliary winding power.
Current constant control, output current is arranged:
Chip Cycle by Cycle detects the peak current of inductance, and CS end is connected to the input of inner peak current comparator, compares with inner 400mV threshold voltage, and when CS voltage reaches inner detection threshold, power tube turns off.
The computing formula of inductance peak current is:
Wherein, RCS is current sampling resistor resistance.
The output of CS comparator also comprises a 350ns lead-edge-blanking time.LED output current computing formula is:
Wherein, IPK is the peak current of inductance.
Excess temperature regulatory function:
BP2832A has overheated regulatory function, reduces output current gradually when driving power is overheated, thus controls power output and temperature rise, makes power source temperature remain on set point, to improve the reliability of system.It is 150 DEG C that chip internal set thermal conditioning temperature spot.
Although the foregoing describe embodiment of the present utility model; but those skilled in the art are to be understood that; these only illustrate; various changes or modifications can be made to present embodiment; and not deviating from principle of the present utility model and essence, protection range of the present utility model is only defined by the appended claims.
Claims (7)
1. a High-efficiency LED lamp drive circuit, it is characterized in that, comprise rectification circuit, current-limiting resistance, driving chip, filter capacitor, energy storage inductor, bypass filter capacitor, overvoltage protection resistance and sampling resistor, the input termination civil power of described rectification circuit, the positive pole of the output of described rectification circuit is leaded up to current-limiting resistance and is connected to driving chip power end, one end and the LED positive pole of another road and filter capacitor are connected, the other end of described filter capacitor is connected with one end of energy storage inductor with the negative pole of LED respectively, the described energy storage inductor other end is connected to the drive end of driving chip, described bypass filter capacitor is connected between the power end of driving chip and ground, described overvoltage protection resistance is connected between the open-circuit-protection end of driving chip and ground, described sampling resistor is connected between the current sample end of driving chip and ground.
2. according to High-efficiency LED lamp drive circuit according to claim 1, it is characterized in that, described driving chip is high accuracy voltage-dropping type LED drive chip, and model is BP2832A.
3. according to High-efficiency LED lamp drive circuit according to claim 2, it is characterized in that, the bridge circuit that described rectification circuit is made up of four antiparallel diodes, the output of described bridge circuit is also connected to source filter capacitor, described active power filtering electric capacity is large electrochemical capacitor, and the current output terminal of described bridge rectifier is connected with the positive pole of large electrochemical capacitor.
4. according to High-efficiency LED lamp drive circuit according to claim 3, it is characterized in that, the input of described rectification circuit is also connected to fuse, and described fuse is serially connected in L phase line.
5. according to High-efficiency LED lamp drive circuit according to claim 4, it is characterized in that, described current-limiting resistance is made up of the first resistance parallel with one another and the second resistance.
6. according to High-efficiency LED lamp drive circuit according to claim 5, it is characterized in that, described sampling resistor is made up of the 3rd resistance of mutually connecting and the 4th resistance.
7. according to the High-efficiency LED lamp drive circuit described in any one of claim 1 to 6, it is characterized in that, described LED lamp drive circuit is also provided with Schottky diode, the input of described Schottky diode is connected with the drive end of driving chip, and the output of described Schottky diode is connected with the positive pole of the LED of driving chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520627794.4U CN204836726U (en) | 2015-08-19 | 2015-08-19 | High -efficient LED lamp driving circuit |
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| CN201520627794.4U CN204836726U (en) | 2015-08-19 | 2015-08-19 | High -efficient LED lamp driving circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793363A (en) * | 2015-11-20 | 2017-05-31 | 华润矽威科技（上海）有限公司 | LED drive circuit and its open-circuit-protection method |
| CN113747633A (en) * | 2021-08-27 | 2021-12-03 | 江西汇荣实业有限公司 | Safe low pressure LED ball bubble lamp |
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2015
- 2015-08-19 CN CN201520627794.4U patent/CN204836726U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793363A (en) * | 2015-11-20 | 2017-05-31 | 华润矽威科技（上海）有限公司 | LED drive circuit and its open-circuit-protection method |
| CN106793363B (en) * | 2015-11-20 | 2019-04-16 | 华润矽威科技（上海）有限公司 | LED drive circuit and its open-circuit-protection method |
| CN113747633A (en) * | 2021-08-27 | 2021-12-03 | 江西汇荣实业有限公司 | Safe low pressure LED ball bubble lamp |
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