Schematic diagram of automatic constant current charging circuit for simple battery
Summary:
With the explosive growth of the digital industry, more and more high-tech digital products have appeared on the market. These are inseparable from rechargeable batteries. In particular, nickel-metal hydride rechargeable batteries are the main types of large-capacity batteries, which are already in communication. Traffic, power and other departments have been widely used, and it is also the most commonly used backup battery in other smart meters, and the battery is inseparable from the charger. This paper introduces a battery automatic constant current charging circuit based on discrete components. The composition, structural characteristics, working principle and circuit adjustment of the circuit are emphasized.
Overall design idea of ​​the circuit
The overall block diagram of the simple battery automatic constant current charging circuit is shown in Figure 1. It is composed of a transformer rectifier circuit, a constant current generation circuit, an automatic power-off circuit, a display circuit and a power supply circuit.
The function of the transformer rectifier circuit is to convert 220V AC in the public power grid into appropriate current and voltage signals to provide signals for subsequent circuits. The function of the constant current generating circuit is to use a transistor current source to generate a constant charging current for the circuit. The function of the automatic power-off circuit is to use the voltage characteristics when the triode is saturated and turned on, so that the circuit can automatically cut off the power when the battery is fully charged. The function of the display circuit is to display the state in which the circuit starts charging and ending charging by using the light emitting diode. The function of the regulated power supply circuit is to provide a DC voltage for all of the above circuits.
For details, please download the instructions for use.
EDP is gradually replacing the existing low voltage differential signal (LVDS) transmission interface, especially in FHD(1,920x1,080 or 1,920x1,200) or panel (UHD) that exceeds FHD resolution.
EDP can dynamically control the refresh frequency of the display panel, which is designed to reduce power consumption when displaying a still picture. In still images, the panel refresh rate can be reduced from a normal 60 images per second to any frequency that does not produce abnormal or flickering images. Reducing the refresh rate reduces power consumption and extends battery life, with some panels down to 40fps or less.
Another application that USES different display refresh rates is when playing movies or games. In game mode, the screen is often calculated by the graphics computing engine before being displayed, and there will be a delay time in the middle. In this case, the refresh frequency of the panel can be dynamically adjusted to make the screen display smooth, without distortion and delay. When playing the movie, the 24FPS picture can be adjusted to 48FPS, so as to eliminate the situation that the picture is not smooth due to the 3:2 pull-down in the traditional 60FPS mode.
Through AUX channel, eDP can control the following functions of the display panel:
Turn on or off the backlight
Backlight brightness adjustment and backlight PWM frequency are adopted.
Turn on or off dynamic backlight adjustment.
Color engine, jitter algorithm or insert black screen for adjustment.
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