Overview of solar lighting

Overview of solar lighting

Inverter classification and circuit structure

Inverter classification and circuit structure

There are many principles for the classification of inverters. For example, according to the number of phases of the inverter output AC voltage, it can be divided into single-phase inverters and three-phase inverters; according to the different types of semiconductor devices used in the inverter, it can be divided into transistor inverters, thyristor inverters and turn-off …

Inverter classification and circuit structure Read More »

Inverter function and technical requirements

Inverter function and technical requirements

1. Function of the inverter Inverters are an important application aspect of power electronics technology. Power electronics technology is a comprehensive technology in which various technologies such as electricity, electronics, automatic control, computers and semiconductors penetrate and combine organically. As we all know, the function of the rectifier is to rectify the 50Hz alternating current …

Inverter function and technical requirements Read More »

Parallel and series charge and discharge controllers

Parallel and series charge and discharge controllers

Parallel type charge and discharge controller The basic circuit principle of the parallel type (also called bypass type) charge and discharge controller is shown in Figure 1. The switching device T1 in the charging circuit of the parallel charge and discharge controller is connected in parallel to the output end of the solar cell array. When …

Parallel and series charge and discharge controllers Read More »

Classification of photovoltaic controllers

Classification of photovoltaic controllers

Photovoltaic charge and discharge controllers can be basically divided into six types: parallel type, series type, pulse width modulation (PWM) type, multi-channel controller, intelligent type and maximum power tracking type. 1. Parallel controller When the battery is fully charged, the output of the photovoltaic array is shunted to a parallel resistor or power module using …

Classification of photovoltaic controllers Read More »

Basic principle of battery over-discharge protection

 Basic principle of battery over-discharge protection

The following takes lead-acid battery as an example to introduce the over-discharge protection principle of the controller. 1. Discharge characteristics of lead-acid batteries The discharge characteristics of lead-acid batteries are shown in Figure 1. It can be seen from the discharge curve that the battery discharge process has three stages. In the beginning (OE) stage, …

┬áBasic principle of battery over-discharge protection Read More »

Photovoltaic power generation system controller

Photovoltaic power generation system controller

In the independent operation of photovoltaic power generation system and solar street light, energy storage battery must be equipped. The battery plays the role of storing and regulating electric energy. When there is excess electric energy generated by sufficient sunshine or strong wind, the battery stores the excess electric energy; on the contrary, when the …

Photovoltaic power generation system controller Read More »

Structure and working principle of VRLA battery

Structure and working principle of VRLA battery

Valve-regulated sealed lead-acid (VRILA) battery is the most common battery used in solar street lamps. Its structure and working principle are introduced as follows. 1. Structure of VRLA battery The main components of VRLA battery are composed of positive plate, negative plate, separator, battery tank cover, sulfuric acid electrolyte, etc. (Figure 1). 2. The role …

Structure and working principle of VRLA battery Read More »