CN204156740U - A kind of constant current regulated power supply circuit of driving LED lamp - Google Patents
A kind of constant current regulated power supply circuit of driving LED lamp Download PDFInfo
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- CN204156740U CN204156740U CN201420539556.3U CN201420539556U CN204156740U CN 204156740 U CN204156740 U CN 204156740U CN 201420539556 U CN201420539556 U CN 201420539556U CN 204156740 U CN204156740 U CN 204156740U
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Abstract
The utility model relates to electronic driving techniques field, especially a kind of constant current regulated power supply circuit of driving LED lamp.It comprises rectification filtering module and constant-current voltage-stabilizing module; The 24V alternating voltage that line voltage is reverse into by rectification filtering module becomes pulsating dc voltage and it is changed into level and smooth direct voltage, and the unstable direct voltage caused because of voltage ripple of power network that filtration module exports by constant-current voltage-stabilizing module changes into metastable direct voltage and exports constant electric current for LED.The utility model by alternating voltage good for inversion after rectifying and wave-filtering, recycling LM2576-ADJ type switching regulator and LM358 type integrated operational amplifier solve voltage stabilizing and the current limliting problem of LED respectively, and LED still can normally work when allowing input voltage to fluctuate in relative broad range, circuit structure is simple, practical.
Description
Technical field
The utility model relates to electronic driving techniques field, especially a kind of constant current regulated power supply circuit of driving LED lamp.
Background technology
Electronic circuit will normally work, power supply is essential, and power source performance is to the useful life of the electronic equipments such as LED, the impact such as serviceability is very large, at present in a lot of application direct current occasion, can not for electronic circuit provide its output can from continuously adjustable DC power supply, in fact be exactly require to provide a constant current regulated power supply circuit with enough range of regulation and carrying load ability, for these problems existed at present, the key driving electronic circuit normally to work is the design of voltage stabilizing circuit and constant-current circuit, it requires it is that selected device and circuit must reach can adapt to load-carrying startability compared with output voltage stabilization in wide input voltage range.In addition, circuit also needs simple and reliable, can export constant electric current, can reduce costs to meet the requirements of simultaneously.
Utility model content
For above-mentioned the deficiencies in the prior art, the purpose of this utility model be to provide a kind of structure simple, practical, can adapting to the constant current regulated power supply circuit of the driving LED lamp of LED startability compared with output voltage stabilization in wide input voltage range.
To achieve these goals, the utility model adopts following technical scheme:
A constant current regulated power supply circuit for driving LED lamp, it comprises rectification filtering module and constant-current voltage-stabilizing module;
The 24V alternating voltage that line voltage is reverse into by described rectification filtering module becomes pulsating dc voltage and pulsating dc voltage is changed into level and smooth direct voltage, and the unstable direct voltage caused because of voltage ripple of power network that filtration module exports by described constant-current voltage-stabilizing module changes into metastable direct voltage and exports constant electric current for LED;
Described rectification filtering module comprises a bridge rectifier diode (D) and a filter capacitor (C1), is connected filter capacitor (C1) between a of described bridge rectifier diode (D) end and c hold two ends, the b being connected to described line voltage to hold to hold with d;
1 pin that described pressure-stabilizing constant flow module comprises a LM2576-ADJ type switching regulator (TC) and LM358 type integrated operational amplifier (IC) described LM2576-ADJ type switching regulator (TC) be connected described filter capacitor (C1) between 5 pin, 4 pin are connected to 2 pin of described LM358 type integrated operational amplifier (IC) by resistance (R2), 4 pin also connect 1 pin of described LM358 type integrated operational amplifier (IC), fly-wheel diode (D5) is connected with between 5 pin and 4 pin, 5 pin also ground connection, 3 pin of described LM358 type integrated operational amplifier (IC) are connected to 2 pin of described LM358 type integrated operational amplifier (IC) successively by resistance (R1), electric capacity (C2), inductance (L1), be connected with resistance (R3), positive pole that 8 pin are connected to electric capacity (C2) between 2 pin of described LM358 type integrated operational amplifier (IC) and 4 pin.
Preferably, it also comprises a piezo-resistance (RV); Described piezo-resistance (Rv) be connected to rectifier diode D a end and between c holds.
Owing to have employed such scheme, the utility model by alternating voltage good for inversion after rectifying and wave-filtering, recycling LM2576 mono-ADJ type switching regulator and LM358 type integrated operational amplifier solve voltage stabilizing and the current limliting problem of LED respectively, and allow input voltage in wider scope in fluctuation situation LED still can normally work, circuit structure is simple, practical.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 1, the constant current regulated power supply circuit of a kind of driving LED lamp of the present embodiment, it comprises rectification filtering module and constant-current voltage-stabilizing module; The 24V alternating voltage that line voltage is reverse into by rectification filtering module becomes pulsating dc voltage and pulsating dc voltage is changed into level and smooth direct voltage, and the unstable direct voltage caused because of voltage ripple of power network that filtration module exports by constant-current voltage-stabilizing module changes into metastable direct voltage and exports constant electric current for LED.
In figure, a end and the c of bridge rectifier diode D is connected filter capacitor C1 between holding two ends, the b being connected to described line voltage to hold to hold with d; 1 pin of LM2576-ADJ type switching regulator TC be connected between 5 pin filter capacitor C1,4 pin by resistance R2 is connected to 2 pin of LM358 type integrated operational amplifier IC, 4 pin also connect LM358 type integrated operational amplifier IC 1 pin, be connected with sustained diode 5,5 pin also ground connection between 5 pin and 4 pin;
Because line voltage exists unstable situation sometimes, certain fluctuation range is pressed with at the 24V alternating current of input, the direct voltage that rectification filtering module is exported is unstable, in order to obtain metastable direct voltage, adopt the adjustable LM2576-ADJ type switching regulator of voltage that the unstable voltage of input can be enable to stablize output, because the input voltage range of LM2576-ADJ type switching regulator is 8 ~ 40V, when this circuit is for driving the LED of 3W, known through test, when input voltage is 13V, by the electric current of load LED lamp and the voltage constant at its two ends, but because 40V has reached the limit of LM2576-ADJ, when limiting edge range of application slightly changes, device easily burns, therefore, the utility model allow input voltage in the scope of 13V ~ 38V in fluctuation situation LED still can normally work, solve the voltage stabilizing problem of driving LED lamp work.
In figure, 3 pin of LM358 type integrated operational amplifier IC are connected to 2 pin of described LM358 type integrated operational amplifier IC successively by resistance R1, electric capacity C2, inductance L 1, are connected with resistance R3, positive pole that 8 pin are connected to electric capacity C2 between 2 pin of described LM358 type integrated operational amplifier IC and 4 pin.
Because the burning voltage of 2 pin outputs of LM2576-ADJ type switching regulator is by the LED of load and resistance R1 dividing potential drop, when voltage reaches certain value, resistance R1 allows the power limited consumed, the magnitude of voltage assigned to is less, cause the two ends of LED will bear very large voltage thus make current value very large, the feedback loop of LM358 type operational amplifier and resistance R2, resistance R3 composition is adopted to make Current Limits be decided to be a constant, for LED provides stable input current, ensure that the work of LED normal table, there is the practicality that circuit structure is simple and very strong.
In addition, between a end of rectifier diode D is held with c, piezo-resistance Rv is connected; Play the effect of protective circuit.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (2)
1. a constant current regulated power supply circuit for driving LED lamp, it comprises rectification filtering module and constant-current voltage-stabilizing module; It is characterized in that:
The 24V alternating voltage that line voltage is reverse into by described rectification filtering module becomes pulsating dc voltage and pulsating dc voltage is changed into level and smooth direct voltage, and the unstable direct voltage caused because of voltage ripple of power network that filtration module exports by described constant-current voltage-stabilizing module changes into metastable direct voltage and exports constant electric current for LED;
Described rectification filtering module comprises a bridge rectifier diode (D) and a filter capacitor (C1), is connected filter capacitor (C1) between a of described bridge rectifier diode (D) end and c hold two ends, the b being connected to described line voltage to hold to hold with d;
1 pin that described pressure-stabilizing constant flow module comprises a LM2576-ADJ type switching regulator (TC) and LM358 type integrated operational amplifier (IC) described LM2576-ADJ type switching regulator (TC) be connected described filter capacitor (C1) between 5 pin, 4 pin are connected to 2 pin of described LM358 type integrated operational amplifier (IC) by resistance (R2), 4 pin also connect 1 pin of described LM358 type integrated operational amplifier (IC), fly-wheel diode (D5) is connected with between 5 pin and 4 pin, 5 pin also ground connection, 3 pin of described LM358 type integrated operational amplifier (IC) are connected to 2 pin of described LM358 type integrated operational amplifier (IC) successively by resistance (R1), electric capacity (C2), inductance (L1), be connected with resistance (R3), positive pole that 8 pin are connected to electric capacity (C2) between 2 pin of described LM358 type integrated operational amplifier (IC) and 4 pin.
2. the constant current regulated power supply circuit of a kind of driving LED lamp as claimed in claim 1, is characterized in that: it also comprises a piezo-resistance (RV); Described piezo-resistance (Rv) be connected to rectifier diode D a end and between c holds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420539556.3U CN204156740U (en) | 2014-09-18 | 2014-09-18 | A kind of constant current regulated power supply circuit of driving LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420539556.3U CN204156740U (en) | 2014-09-18 | 2014-09-18 | A kind of constant current regulated power supply circuit of driving LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204156740U true CN204156740U (en) | 2015-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420539556.3U Expired - Fee Related CN204156740U (en) | 2014-09-18 | 2014-09-18 | A kind of constant current regulated power supply circuit of driving LED lamp |
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| CN (1) | CN204156740U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106878864A (en) * | 2017-03-03 | 2017-06-20 | 广东欧珀移动通信有限公司 | Power circuit and audio frequency apparatus |
-
2014
- 2014-09-18 CN CN201420539556.3U patent/CN204156740U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106878864A (en) * | 2017-03-03 | 2017-06-20 | 广东欧珀移动通信有限公司 | Power circuit and audio frequency apparatus |
| CN106878864B (en) * | 2017-03-03 | 2020-07-10 | Oppo广东移动通信有限公司 | Power supply circuit and audio device |
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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 |
Granted publication date: 20150211 Termination date: 20150918 |
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| EXPY | Termination of patent right or utility model |