CN206759328U

CN206759328U - A kind of LED power

Info

Publication number: CN206759328U
Application number: CN201720571063.1U
Authority: CN
Inventors: 黄溥将
Original assignee: Guangxi Nanning Lucky Electronic Technology Co Ltd
Current assignee: Guangxi Nanning Lucky Electronic Technology Co Ltd
Priority date: 2017-05-19
Filing date: 2017-05-19
Publication date: 2017-12-15
Anticipated expiration: 2027-05-19

Abstract

The utility model provides a kind of LED power, including EMI input filter modules, input rectifying filtration module, transformer change-over circuit, output rectification filter module, PWM controller, feedback circuit；LED power of the present utility model uses the power supply control chip that PWM controlling types integrate, and the actual constant current effect that measures is good, and output circuit is stable, and control structure is simple, small volume, operating efficiency are high.

Description

A kind of LED power

Technical field

Driving power is the utility model is related to, more particularly to a kind of LED power.

Background technology

LED (light emitting diode) is a kind of solid-state semiconductor device that can convert electrical energy into visible ray, extensive use In fields such as illumination, displays.LED is as a kind of lighting source, it is necessary to which stable power supply, just can guarantee that its illuminating effect and make Use the life-span.

Existing conventional LED power, the problems such as power-efficient is low, LED power is applicable voltage range is narrow be present, it is above-mentioned to ask The topic direct or indirect operating efficiency and service life that have impact on LED power and LED lamp bead.

Utility model content

For above-mentioned deficiency, it is high that the utility model provides a kind of simple control structure, small volume, operating efficiency LED power.

The utility model solves the above problems by the following technical programs：

A kind of LED power, including EMI input filter modules, input rectifying filtration module, transformer change-over circuit, output Rectification filtering module, PWM controller, feedback circuit, wherein,

EMI input filter modules, using RC low-pass filter circuits；

Input rectifying filtration module, filtered electric capacity is filtered again after AC rectification, exports stable voltage waveform；

Transformer change-over circuit, high-tension circuit is converted into low-voltage direct supply load；

Output rectification filter module, export steady dc voltage；

PWM controller, including oscillator, reference voltage source, error amplifier and PWM comparators, PWM controller produce arteries and veins Wide modulated signal, its dutycycle are controlled by feedback circuit.

In such scheme, it is preferred that the EMI input filter modules, a piezo-resistance in parallel before filtration module, Voltage clamping to a relatively-stationary magnitude of voltage, is realized the protection to late-class circuit by piezo-resistance.

In such scheme, it is preferred that the input rectifying filtration module, alternating current pass through full-bridge type rectification.

In such scheme, it is preferred that also including biasing circuit, protection circuit.

The advantages of the utility model is with effect：

LED power of the present utility model uses the power supply control chip that PWM controlling types integrate, actual to measure constant current effect Good, output circuit is stable, and control structure is simple, small volume, operating efficiency are high.

Brief description of the drawings

Fig. 1 is the structural representation of the utility model embodiment.

Embodiment

The utility model is described in further detail with reference to embodiments.

A kind of LED power is as shown in Figure 1.Including EMI input filter modules, input rectifying filtration module, transformer conversion Circuit, output rectification filter module, PWM controller, feedback circuit.Foregoing circuit is some conventional circuits of this area, but It is the work that needs carried out existing LED power some improvement, further improve LED power of the application according to site operation Make efficiency.

EMI input filter modules, using RC low-pass filter circuits, a piezo-resistance in parallel, pressure-sensitive before filtration module Resistance can realize the protection to late-class circuit by voltage clamping to a relatively-stationary magnitude of voltage.

Input rectifying filtration module, alternating current pass through full-bridge type rectification, then filtered electric capacity is filtered, and export stabilization Voltage waveform.

Transformer change-over circuit, the circuit that transformer is once surveyed still fall within high-tension circuit, need to be converted into low-voltage direct ability Supply load.

Output rectification filter module, because the voltage of transformer conversion still has peak value fluctuation, load needs steady and continuous DC circuit, it is therefore desirable to which recovery diode carries out rectification, filter capacitor is filtered and charged.

PWM controller is core, including oscillator, reference voltage source, error amplifier and PWM comparators, PWM controls Device processed produces pulse-width signal, and its dutycycle is controlled by feedback circuit.

Alternating current, by bridge rectifier filter circuit, obtains smoother output voltage after EMI input filter modules, Chip is respectively outputted to again and starts operating circuit and transformer change-over circuit, and stable direct current is then exported by rectifying and wave-filtering Powering load is pressed, while IC controls IC controlling switch devices further according to the voltage change of output circuit by PWM Turn-on and turn-off control transformer energy transmission.

In addition it is also necessary to increase biasing circuit, protection circuit etc..

The preferred embodiment created to the utility model above is illustrated, but the utility model is not limited to Embodiment, those skilled in the art can also make a variety of etc. on the premise of without prejudice to the utility model creative spirit Same modification or replacement, these equivalent modifications or replacement are all contained in scope of the present application.

Claims

1. a kind of LED power, it is characterised in that including EMI input filter modules, input rectifying filtration module, transformer conversion Circuit, output rectification filter module, PWM controller, feedback circuit,

Wherein,

EMI input filter modules, using RC low-pass filter circuits；

Output rectification filter module, export steady dc voltage；

PWM controller, including oscillator, reference voltage source, error amplifier and PWM comparators, PWM controller produce pulsewidth and adjusted Signal processed, its dutycycle are controlled by feedback circuit.

A kind of 2. LED power according to claim 1, it is characterised in that：The EMI input filter modules, in filtering mould A piezo-resistance in parallel, piezo-resistance to a relatively-stationary magnitude of voltage, realize voltage clamping to late-class circuit before block Protection.

A kind of 3. LED power according to claim 1, it is characterised in that：The input rectifying filtration module, alternating current warp Cross full-bridge type rectification.

A kind of 4. LED power according to claim 1, it is characterised in that：Also include biasing circuit, protection circuit.