Patent application number | Description | Published |
20090102431 | Universal serial bus charger circuit and charging method - The present invention discloses a universal serial bus (USB) charging circuit, comprising: a charging path for charging a battery from a USB host; a charging switch located on the charging path; a current sensing circuit for sensing current information on the charging path; a maximum available current detection circuit for detecting the maximum available current from the USB host; and a loop controller circuit for controlling the charging switch so that the charging current on the charging path is substantially equal to the maximum available current detected by the maximum available current detection circuit, wherein the maximum available current detection circuit detects the maximum available current during circuit initialization and stores it. | 04-23-2009 |
20100066312 | Overvoltage protection circuit for use in charger circuit system and charge circuit with overvoltage protection function - The present invention discloses an overvoltage protection (OVP) circuit for use in a charger circuit system, comprising: a power transistor electrically connected between a voltage supply and a battery; an OVP circuit which turns off the transistor when a voltage supply exceeds a threshold value; and a multiplexing circuit electrically connected between an output of the OVP circuit and the gate of the transistor. The present invention also discloses a charger circuit with an OVP function, comprising: a single power transistor electrically connected between a voltage supply and a battery; an OVP control circuit which turns off the power transistor when a voltage supply exceeds a threshold value; and a charger control circuit which controls the gate of the power transistor to determine a charge current to the battery when the voltage supply does not reach the threshold value. | 03-18-2010 |
20140312855 | MULTI-PURPOSE POWER MANAGEMENT CHIP AND POWER PATH CONTROL CIRCUIT - The present invention discloses a multi-purpose power management chip and a power path control circuit. The multi-purpose power management chip includes: a switch circuit including at least one power transistor; a switch control circuit for generating a first switch signal to control an operation of the power transistor to thereby control the power conversion between an input terminal and an output terminal; a power path management circuit for controlling the charging operation from the output terminal to the battery; a current source for supplying a current to the battery; and a path selection circuit for determining whether the charging operation to the battery is controlled by the power path management circuit and the current source or not according to whether a power path power transistor is provided on the power path or not. | 10-23-2014 |
20140320091 | CONTROL METHOD FOR SUPPLYING POWER - In a control method for supplying power, a first power regulator supplies a first current and an output voltage to a second power regulator and the second power regulator supplies a second current to a load. The method includes: increasing the output voltage and detecting the second current; determining whether the second current suddenly drops as the output voltage increases; when the second current drops, defining a level of the output voltage which corresponds to a starting point of the sudden drop as an upper limit; when the output voltage increases but the second current neither increases nor suddenly drops, defining a level of the output voltage corresponding to a point where the second current stops increasing as a lower limit; and setting the output voltage to be lower than or equal to the upper limit, and higher than or equal to the lower limit. | 10-30-2014 |
20140354050 | POWER BANK AND CONTROL METHOD FOR SUPPLYING POWER - The present invention discloses a power bank and a control method for supplying power. The power bank includes a rechargeable battery, a charging switch for controlling a charging path to the rechargeable battery, a discharging switch for controlling a discharging path from the rechargeable battery, and a control circuit for controlling the charging switch and the discharging switch according to current information of the charging path, current information of the discharging path, and battery capacity information of the rechargeable battery. The power bank is adapted for being connected in series between a power supply apparatus and a load. The control method detects the supply current from the power supply apparatus and the current required by the load to determine the charging and discharging operations of the power bank. | 12-04-2014 |
20140361730 | BI-DIRECTIONAL SWITCHING REGULATOR AND CONTROL CIRCUIT THEREOF - The present invention discloses a bi-directional switching regulator and a control circuit of the bi-directional switching regulator. The bi-directional switching regulator includes a single power stage, an operation circuit, a power path management circuit and a power path controller. The power path management circuit includes a first power path switch and a second power path switch to be coupled to at least two batteries respectively, so that at least two batteries can be charged by the output voltage supplied by the single power stage. | 12-11-2014 |
20150035493 | BI-DIRECTIONAL SWITCHING REGULATOR AND CONTROL CIRCUIT THEREOF - The present invention discloses a bi-directional switching regulator and a control circuit thereof. The bi-directional switching regulator includes a power stage, an operation circuit controlling the power stage, and a power path management circuit. The power path management circuit includes a power path switch electrically connected between the output terminal and the battery, and a power path controller controlling the power path switch. The operation circuit generates the operation signal according to the output voltage or a battery voltage of the battery, and the charging current, so that: (1) a voltage difference between the output voltage and the battery voltage is ICHG*R, wherein ICHG represents the charging current and R represents a conduction resistance when the power path switch is fully conductive; or (2) the output voltage is determined by a higher one of a predetermined voltage level and the sum of ICHG*R plus the battery voltage. | 02-05-2015 |
20150042298 | BUCK SWITCHING REGULATOR - The present invention discloses a buck switching regulator including a power stage, a driver circuit and a bootstrap capacitor. The power stage includes an upper-gate switch, a lower-gate switch and an inductor. The upper-gate switch is electrically connected between an input terminal and a switching node. The lower-gate switch is electrically connected between the switching node and ground. The bootstrap capacitor is electrically connected between a boost node and the switching node, wherein the boost node is electrically connected to a voltage supply. When a voltage across the bootstrap capacitor is smaller than a reference voltage, the lower-gate switch is turned on to charge the bootstrap capacitor from the voltage supply. When the charging operation to the bootstrap capacitor has been conducted over a predetermined time period or when the current of the inductor has reached a predetermined value, the charging operation to the bootstrap capacitor is ceased. | 02-12-2015 |