CN204539567U - A kind of LED drive power - Google Patents
A kind of LED drive power Download PDFInfo
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- CN204539567U CN204539567U CN201520187801.3U CN201520187801U CN204539567U CN 204539567 U CN204539567 U CN 204539567U CN 201520187801 U CN201520187801 U CN 201520187801U CN 204539567 U CN204539567 U CN 204539567U
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- resistance
- rectifier
- led drive
- drive power
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Abstract
The utility model belongs to the technical field of LED drive power; The technical problem solved is: provide a kind of efficiency higher and lower-cost LED drive power; The technical scheme adopted is: a kind of LED drive power, comprising: current rectifying and wave filtering circuit, reduction voltage circuit and output circuit, and described current rectifying and wave filtering circuit comprises rectifier and filter capacitor C2, and described reduction voltage circuit comprises inductance L 1, diode D1 and electric capacity C3; Described driving power also comprises the constant-current driven chip U1 that model is YH2048; Be applicable to LED drive power field.
Description
Technical field
The utility model belongs to the technical field of LED drive power.
Background technology
In recent years, LED lamp is promoted rapidly as the energy saving and environment friendly lighting of one, be widely used in reading lamp, flashlight, directing light of automobile, baby spot, label, building profile and dome illumination, portable flash lamp, the field such as medical illumination and decorative illumination lamp, but, because LED drive power in the market mainly adopts the Switching Power Supply of PWM control mode, the requisite a kind of components and parts of this kind of LED drive power are exactly power MOS pipe, as everyone knows, power MOS pipe can produce a large amount of heats when LED drive power normally works, if heat can not distribute in time, then can cause the reduction of the luminous efficiency of LED, power loss becomes large, and then affect the useful life of LED drive power.
For solving the problem, way conventional is at present in power tube MOS device, add that radiator helps it to dispel the heat, improve the use luminous efficiency of LED drive power, but, this method not only can cause the size of LED drive power to become large, and the cost increase of driving power can be made, do not utilize promoting the use of of product; Therefore, a kind of efficiency is higher and lower-cost LED drive power just seems particularly important.
Utility model content
The utility model overcomes the deficiency that prior art exists, and technical problem to be solved is: provide a kind of efficiency higher and lower-cost LED drive power.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of LED drive power, comprising: current rectifying and wave filtering circuit, reduction voltage circuit and output circuit, described current rectifying and wave filtering circuit comprises rectifier and filter capacitor C2, and described reduction voltage circuit comprises inductance L 1, diode D1 and electric capacity C3, and described output circuit comprises resistance R3, model is that the metal-oxide-semiconductor gate terminal GATE of the constant-current driven chip U1 of YH2048 is connected with one end of resistance R1, the other end of described resistance R1 is also connected with one end of resistance R2 after connecing the voltage source VCC of described constant-current driven chip U1 and one end of electric capacity C1, the other end of described resistance R2 also connects the forward output of described rectifier, one end of described filter capacitor C2, the negative pole of described diode D1, the positive pole of described electric capacity C3 is connected with LED positive input terminal LED+ with behind one end of described resistance R3, the positive pole of described diode D1 is also connected with the drain electrode end DRN of two internal power switches of described constant-current driven chip U1 after connecing one end of described inductance L 1, the other end of described inductance L 1 is also connected with LED negative input end LED-after connecing the negative pole of described electric capacity C3 and the other end of described resistance R3, the inductance peak current sampling end ISW of described constant-current driven chip U1 is also connected with one end of resistance R5 behind one end of connecting resistance R4, the earth resistance end RSET of described constant-current driven chip U1 is connected with one end of resistance R6, the other end of described resistance R6 also connects the other end of described electric capacity C1, the earth terminal GND of described constant-current driven chip U1, the other end of described resistance R4, the other end of described resistance R5 is connected with the negative sense output of described rectifier with the other end of described filter capacitor C2, the input of described rectifier is connected with AC power.
Described rectifier comprises bridge rectifier T1, be connected with the live wire L of described AC power after the forward ac input end serial connection fuse F1 of described bridge rectifier T1, the negative sense ac input end of described bridge rectifier T1 is connected with the zero line N of described AC power.
The utility model compared with prior art has following beneficial effect:
LED drive power in the utility model mainly comprises current rectifying and wave filtering circuit, reduction voltage circuit and output circuit, and described current rectifying and wave filtering circuit comprises rectifier and filter capacitor C2, and described reduction voltage circuit comprises inductance L 1, diode D1 and electric capacity C3; Described driving power also comprises the constant-current driven chip U1 that model is YH2048; The inner integrated power metal-oxide-semiconductor of described constant-current driven chip U1, has multiple protection functions, without the need to auxiliary winding, can realize the open circuit protecting function of LED drive power, circuit structure is simple, cost is lower; Simultaneously, the ISW pin of described constant-current driven chip U1 is inductance peak current sampling end, chip periodically can detect the peak current of inductance, and compare with internal reference threshold voltage, like this, just make LED drive power can be operated in critical current mode pattern, output current does not change with inductance value and the change of LED operating voltage, and then enable LED drive power average current in a larger input voltage range, keep stable, realize excellent load regulation, and without stroboscopic, improve the efficiency of power supply.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in more detail;
Fig. 1 is the utility model circuit theory diagrams;
In figure: 1 is current rectifying and wave filtering circuit, 2 is reduction voltage circuit, and 3 is output circuit.
Embodiment
As shown in Figure 1, a kind of LED drive power of the utility model, comprise: current rectifying and wave filtering circuit 1, reduction voltage circuit 2 and output circuit 3, described current rectifying and wave filtering circuit 1 comprises rectifier and filter capacitor C2, described reduction voltage circuit 2 comprises inductance L 1, diode D1 and electric capacity C3, and described output circuit 3 comprises resistance R3; Wherein, current rectifying and wave filtering circuit 1 can high frequency spurs in filtering AC power and interference signal, obtains high voltage direct current, and power consumption equipment can be made to obtain required low-voltage DC by reduction voltage circuit 2.
In the utility model, model is that the metal-oxide-semiconductor gate terminal GATE of the constant-current driven chip U1 of YH2048 is connected with one end of resistance R1, the other end of described resistance R1 is also connected with one end of resistance R2 after connecing the voltage source VCC of described constant-current driven chip U1 and one end of electric capacity C1, the other end of described resistance R2 also connects the forward output of described rectifier, one end of described filter capacitor C2, the negative pole of described diode D1, the positive pole of described electric capacity C3 is connected with LED positive input terminal LED+ with behind one end of described resistance R3, the positive pole of described diode D1 is also connected with the drain electrode end DRN of two internal power switches of described constant-current driven chip U1 after connecing one end of described inductance L 1, the other end of described inductance L 1 is also connected with LED negative input end LED-after connecing the negative pole of described electric capacity C3 and the other end of described resistance R3, the inductance peak current sampling end ISW of described constant-current driven chip U1 is also connected with one end of resistance R5 behind one end of connecting resistance R4, the earth resistance end RSET of described constant-current driven chip U1 is connected with one end of resistance R6, the other end of described resistance R6 also connects the other end of described electric capacity C1, the earth terminal GND of described constant-current driven chip U1, the other end of described resistance R4, the other end of described resistance R5 is connected with the negative sense output of described rectifier with the other end of described filter capacitor C2, the input of described rectifier is connected with AC power, particularly, the U1 of constant-current driven chip described in the utility model is applicable to the input voltage range of 85VAC-264VAC, output current reaches as high as 350mA.
Further, described rectifier comprises bridge rectifier T1, be connected with the live wire L of described AC power after the forward ac input end serial connection fuse F1 of described bridge rectifier T1, the negative sense ac input end of described bridge rectifier T1 is connected with the zero line N of described AC power.
In the utility model, the inner integrated power metal-oxide-semiconductor of described constant-current driven chip U1, has multiple protection functions, without the need to auxiliary winding, the open circuit protecting function of LED drive power can be realized, circuit structure is simple, cost reduces 10%-15% than LED drive power of the same type on market, simultaneously, the ISW pin of described constant-current driven chip U1 is inductance peak current sampling end, chip periodically can detect the peak current of inductance, and compare with internal reference threshold voltage, because LED drive power is operated in critical current mode pattern, output current does not change with inductance value and the change of LED operating voltage, make LED drive power average current can keep stable in a larger input voltage range, realize excellent load regulation, and without stroboscopic, LED drive power is made to have higher power factor and efficiency, wherein LED drive power efficiency can reach more than 92%.
A kind of LED drive power of the utility model, the open circuit protecting function of LED drive power can be realized without the need to auxiliary winding, pass through optimization circuits simultaneously, improve the efficiency of LED drive power, solve the problem that traditional LED drive power cost is higher, efficiency is lower, there is substantive distinguishing features and progress; By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from the utility model aim.
Claims (2)
1. a LED drive power, comprise: current rectifying and wave filtering circuit (1), reduction voltage circuit (2) and output circuit (3), it is characterized in that: described current rectifying and wave filtering circuit (1) comprises rectifier and filter capacitor C2, described reduction voltage circuit (2) comprises inductance L 1, diode D1 and electric capacity C3, and described output circuit (3) comprises resistance R3;
Model is that the metal-oxide-semiconductor gate terminal GATE of the constant-current driven chip U1 of YH2048 is connected with one end of resistance R1, the other end of described resistance R1 is also connected with one end of resistance R2 after connecing the voltage source VCC of described constant-current driven chip U1 and one end of electric capacity C1, the other end of described resistance R2 also connects the forward output of described rectifier, one end of described filter capacitor C2, the negative pole of described diode D1, the positive pole of described electric capacity C3 is connected with LED positive input terminal LED+ with behind one end of described resistance R3, the positive pole of described diode D1 is also connected with the drain electrode end DRN of two internal power switches of described constant-current driven chip U1 after connecing one end of described inductance L 1, the other end of described inductance L 1 is also connected with LED negative input end LED-after connecing the negative pole of described electric capacity C3 and the other end of described resistance R3, the inductance peak current sampling end ISW of described constant-current driven chip U1 is also connected with one end of resistance R5 behind one end of connecting resistance R4, the earth resistance end RSET of described constant-current driven chip U1 is connected with one end of resistance R6, the other end of described resistance R6 also connects the other end of described electric capacity C1, the earth terminal GND of described constant-current driven chip U1, the other end of described resistance R4, the other end of described resistance R5 is connected with the negative sense output of described rectifier with the other end of described filter capacitor C2, the input of described rectifier is connected with AC power.
2. a kind of LED drive power according to claim 1, it is characterized in that: described rectifier comprises bridge rectifier T1, be connected with the live wire L of described AC power after the forward ac input end serial connection fuse F1 of described bridge rectifier T1, the negative sense ac input end of described bridge rectifier T1 is connected with the zero line N of described AC power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520187801.3U CN204539567U (en) | 2015-03-31 | 2015-03-31 | A kind of LED drive power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520187801.3U CN204539567U (en) | 2015-03-31 | 2015-03-31 | A kind of LED drive power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204539567U true CN204539567U (en) | 2015-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520187801.3U Expired - Fee Related CN204539567U (en) | 2015-03-31 | 2015-03-31 | A kind of LED drive power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204539567U (en) |
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2015
- 2015-03-31 CN CN201520187801.3U patent/CN204539567U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20170331 |