I-O DATA DEVICE, INC. Patent applications |
Patent application number | Title | Published |
20140240873 | Switching Power Supply Circuit with Protective Function - A switching power supply circuit includes a transformer having primary, secondary and tertiary windings; a primary-side rectifying-and-smoothing circuit that converts AC power to DC power then smoothes it; a secondary-side rectifying-and-smoothing circuit that smoothes secondary-side power; a tertiary-side rectifying-and-smoothing circuit that smoothes power from the tertiary winding; a switching circuit that switches the primary winding; a pulse width control circuit that controls the switching of the switching circuit; an output-error detecting circuit that detects a deviation of a secondary-side DC output voltage from a reference voltage; and a ripple-voltage detecting-and-controlling circuit that detects a ripple-voltage of the secondary-side DC output voltage and stop-controls the output-error detecting circuit, wherein a stop-control signal from the ripple-voltage detecting-and-controlling circuit causes the output-error detecting circuit to stop outputting, then a drive signal to the switching circuit is stopped, thus the operation of the switching power supply circuit is stopped. | 08-28-2014 |
20130170621 | SWITCHING POWER SUPPLY CIRCUIT PROVIDED WITH PROTECTION FUNCTION - The present invention includes: a transformer having a primary winding, a secondary winding and a tertiary winding; a primary-side rectifying and smoothing circuit, which converts alternating-current power to direct-current power and smoothes the power; a secondary-side rectifying and smoothing circuit, which smoothes secondary-side power; a tertiary-side rectifying and smoothing circuit, which smoothes power of the tertiary winding; a switching circuit, which opens and closes the primary winding; a pulse width control circuit, which controls the pulse width of drive signals that control the opening and closing of the switching circuit; and a secondary-side electrolytic capacitor deterioration detecting circuit, which detects deterioration of the secondary-side electrolytic capacitor. The secondary-side electrolytic capacitor deterioration detecting circuit detects deterioration of the secondary-side electrolytic capacitor by inputting the output voltage of the tertiary-side rectifying and smoothing circuit, and stops operation of a switching power supply circuit. | 07-04-2013 |
20120096067 | WEB SYSTEM, INSTRUCTION-RECEIVING SYSTEM AND CONTENTS DATA PROVIDING METHOD - The object is to provide a Web system A | 04-19-2012 |
20110016256 | USB PORTABLE DEVICE - A USB portable device includes an activating USB peripheral, a storing USB peripheral, and a controlling USB peripheral. If the USB portable device is connected to a host apparatus, the activating USB peripheral is recognized as a readable device and a switching program in the recognized readable device is read in the host apparatus and is executed. Consequently, a switching instruction is received from the host apparatus, the readable device is unmounted, and the storing USB peripheral is recognized as the readable device. | 01-20-2011 |