Abstract: The present invention discloses a regular circuitry for reducing ripple resulting from a line voltage transmitting to a secondary side of a power transformer. The regular circuitry electrically connected in parallel with the power transformer includes a ripple sampling circuit, a proportional amplifier circuit, and a reversing amplifier circuit. The ripple sampling circuit selects a sampling ripple from the input port of the power transformer, which is electrically connected in series between a primary side rectification circuit and a secondary side rectification circuit. The proportional amplifier circuit receives the sampling ripple to generate an amplified sampling ripple. The amplified sampling ripple transmits to the reversing amplifier circuit so that a reversed sampling ripple is generated. Thus, the reversed sampling ripple can be input to the output port of the power transformer to superimpose on the signal output from the power transformer to reduce the ripple resulting from the line voltage.

Abstract: A foldable solar energy apparatus is provided. The foldable solar energy apparatus includes a frame, a first solar energy module, an actuation module, and a power module. A photovoltaic panel is coupled to a first holder of the first solar energy module, and electricity generated by the photovoltaic panel is stored in the power module. The first holder is rotatably coupled to the frame so that the first holder is collapsible via the actuation module, which is disposed at the frame and connected to the first holder. The first holder and the actuation module provide the solar energy apparatus with a foldable function. Thus, the solar energy apparatus can be folded in response to changes in weather conditions, thereby preventing the photovoltaic panel from being damaged by bad weather.

Abstract: A bias correction device to be used on a power supply which has a high voltage output end and a low voltage output end bridges the high voltage output end and the low voltage output end. When the output voltage at the low voltage output end is too low the bias correction device makes the high voltage output end to output a voltage to compensate the low voltage output end so that the voltage at the low voltage output end is raised to be maintained a preset output voltage level.