CN203554726U - Multiplexed voltage output LED (Light Emitting Diode) driving power supply of feedback regulation frequency system - Google Patents

Abstract

The utility model relates to a multiplexed voltage output LED (Light Emitting Diode) driving power supply of a feedback regulation frequency system. The multiplex voltage output LED driving power supply is characterized by comprising a multiplexed output voltage module, an LLC (Logical Link Control) resonant circuit module connected with the multiplexed output voltage module, a PWM (Pulse-Width Modulation) modulation circuit module, a peripheral optocoupler feedback circuit module and a Buck step-down circuit module connected with the PWM modulation circuit. According to the multiplex voltage output LED driving power supply of feedback regulation frequency system provided by the utility model, a multiplexed voltage output circuit of the feedback regulation frequency system is adopted, wherein one path of voltage is fed back to soft start voltage and overload protection voltage of the PWM modulation circuit and the LLC resonant circuit, the other path of voltage is fed back to a peripheral voltage feedback circuit to regulate bus voltage dynamically, thus constant voltage control of an output end is achieved, moreover, the circuit security performance is high, the voltage feedback is accurate and the conversion efficiency is high.

Description

A multi-channel voltage output LED drive power supply for feedback regulation frequency system

technical field

The utility model belongs to the field of feedback regulation driving power supply and relates to a multi-channel voltage output LED driving power supply of a feedback regulation frequency system. the

Background technique

Nowadays, with the development of miniaturization of communication products, the performance requirements for driving power are getting higher and higher, which promotes the development of power supply to the trend of high frequency, high reliability, low consumption and miniaturization, and at the same time promotes the development of driving power in the high-tech field. Wide range of applications. The traditional LED driving power supply uses the bus voltage to directly act on the switching frequency of the PWM control circuit and the oscillation frequency of the LLC resonant circuit to change the output voltage gain to achieve the effect of voltage stabilization. However, when the output load voltage changes greatly in a short period of time due to some factors, the circuit cannot quickly and efficiently adjust the duty cycle of the PWM wave and the oscillation frequency of the LLC circuit due to the lack of timely and effective feedback signals, thus affecting the normal driving function. The conversion efficiency of this circuit is low, and it can only convert the high voltage of 220V into the low voltage required for the start-up of each part of the module, which consumes a lot of energy. And the safety performance is not high, as long as a small part of the circuit in the circuit has a problem, the whole circuit will be paralyzed, and the safety performance is not high. Therefore, it is imperative to design a high-efficiency, safe, stable and low-power LED driver. the

Contents of the invention

The purpose of this utility model is mainly to solve the shortcomings of traditional LED drive power supply without dynamic feedback signal equipment, large energy consumption, and unsafety. The multi-channel low DC voltage generated by the feedback adjustment frequency system is used for the start-up and overload protection of various parts of the circuit. DC voltage, dynamically adjust the bus voltage to achieve high conversion efficiency. An LED drive power supply with safe performance and dynamic regulation of bus voltage is provided. The technical scheme that the utility model solves the technical problem that takes is as follows:

The utility model comprises a multi-channel output voltage module of a feedback regulation frequency system, an LLC resonant circuit module, a PWM modulation circuit module, a Buck step-down circuit module and a peripheral optocoupler feedback circuit module. the

The output terminal of the LLC resonant circuit is connected to the input terminal of the multi-channel output voltage module of the feedback regulation frequency system, the first output terminal of the multi-channel output voltage module of the feedback regulation frequency system is connected to the frequency control input terminal of the PWM modulation circuit, and the second The first voltage output terminal is connected to the optocoupler sensing input terminal of the peripheral optocoupler feedback circuit, the third voltage output terminal is connected to the self-start protection drive input terminal of the LLC resonant circuit, and part of the output terminal of the PWM modulation circuit is connected to the input terminal of the bus voltage for regulation The loss-compensated bus voltage, and the other part is connected to the frequency control terminal of the LLC resonant circuit module. the

Compared with the prior art, the utility model has the following beneficial effects: the device solves the problems of no dynamic feedback signal device and unsafeness of the traditional LED drive power by integrating the commonly used LED drive power. The problem of high conversion efficiency is achieved by dynamically adjusting the bus voltage. the

Description of drawings

Fig. 1 is a structural block diagram of the utility model. the

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described. the

As shown in Figure 1, a multi-channel voltage output LED drive power supply of a feedback regulation frequency system is characterized in that it includes a multi-channel output voltage module 1, an LLC resonant circuit module 2 connected to the multi-channel output voltage module, and a PWM modulation circuit module 3. Peripheral optocoupler feedback circuit module 5, and Buck step-down circuit module 4 connected to the PWM modulation circuit. the

The specific working process of the device is: power on, PWM modulation circuit, LLC resonant circuit starts to work to generate voltage output, and the multi-output voltage divider circuit of the feedback adjustment frequency system works successively to soft start the PWM modulation circuit and LLC resonant circuit respectively Voltage and overvoltage protection voltage, part of the voltage is input to the optocoupler receiving end of the peripheral optocoupler feedback circuit, and then the PWM modulation circuit generates a corresponding duty cycle of the output signal to adjust the bus voltage, and the adjusted bus voltage is respectively returned to the input The PWM modulation circuit performs frequency compensation, and then adjusts and compensates the operating frequency of the LLC resonant circuit. The LLC resonant circuit generates a certain voltage gain according to the adjusted bus voltage to achieve the effect of stable constant voltage output. the

Claims (1)

1. the plurality of voltages of a feedback regulation frequency system output LED driving power, is characterized in that comprising multichannel output voltage module, LLC resonant circuit module, PWM modulation circuit module, Buck reduction voltage circuit module, peripheral optocoupler feedback circuit module;

The multichannel output voltage module input of described LLC resonant circuit output termination feedback regulation frequency system, the FREQUENCY CONTROL input of the first via output termination PWM modulation circuit of the multichannel output voltage module of feedback regulation frequency system, the optocoupler induction input of the second road Voltage-output termination light surround coupling feedback circuit, the self-starting protection of Third Road Voltage-output termination LLC resonant circuit drives input, the input of the part output termination busbar voltage of PWM modulation circuit regulates the busbar voltage of electrode compensation, the frequency control terminal of another part output termination LLC resonant circuit module.

Images