Chengdu Monolithic Power Systems Co., Ltd.

Alibaba Group Holding Limited

Alipay (hangzhou) Information Technology Co., Ltd.

Cdgm Glass Co., Ltd

Wei Yuan

Qian Ouyang

Suhua Luo

Pengpeng Ma

Xiaofei Wan

Zhi Xin

Ouyang Qian

Bingying Zhu

Embodiments of this specification provide a payment service implementation method and apparatus. According to the method in the embodiments, when a payment service is performed, anonymous processing needs to be performed on original payment account information. First, a random number is used to perform transform processing on the original payment account information, so that information encrypted each time by using a public key is different. Then, the public key and an encryption algorithm obtained in advance are used to encrypt payment account information obtained after the transform processing, so as to obtain anonymous payment account information, thereby completing an anonymous processing process. After anonymous processing is completed, the obtained anonymous payment account information may be used to perform a payment operation.

Payment service implementation methods and apparatuses

A current threshold regulation method is used in a switching converter with a tank element and a transistor. The current threshold regulation method includes: detecting whether the input voltage is lower than an input under voltage threshold and generating an input under voltage indication signal; detecting whether the output voltage is lower than an output under voltage threshold and generating an output under voltage indication signal; generating a current threshold based on the input under voltage indication signal and output under voltage indication signal; comparing a current flowing though the tank element with the current threshold and generating a current comparison signal; and generating a control signal based on the current comparison signal to control the transistor.

Current threshold regulation method used in switching converters

The present invention provides a high refractivity and high dispersion optical glass and optical element with small relative partial dispersion (Pg,F), high transmittance and good chemical stability. For optical glass, with anion as O, wherein a cation thereof contains the following components by weight percentage: 12-25% of Si; 58-75% of Nb+W+Zr; 8-25% of Li+Na+K; 10% of Baor less. Based on the reasonable component design, the refractive index of the optical glass is 1.81-1.89, the Abbe number is 20-29, Pg,F is 0.5956-0.6199, and the corresponding wave length &#x3bb;is below 450 nm when the transmittance reaches up to 70%. Therefore, the optical glass provided by the present invention is applicable to high-quality optical elements.

Optical glass and optical element

A COT switching converter includes a switching circuit having a main switch, an on-time control circuit configured to generate an on-time control signal, a comparing circuit, a logic circuit and a reference voltage adjusting circuit. The comparing circuit compares a reference voltage with a feedback signal indicative of output voltage of the switching circuit to generate a comparison signal. Based on the on-time control signal and the comparison signal, the logic circuit generates a control signal of the main switch. The reference voltage adjusting circuit generates the reference voltage based on a basic reference voltage and the control signal, in each switching cycle of the switching converter, the reference voltage is pulled down when the main switch is turned ON and increases with a slew rate until the main switch is turned ON again in the next switching cycle or the reference voltage increases to a maximum value.

Constant on-time switching converter with reference voltage adjusting circuit and controller thereof

A COT switching converter includes a first switch, a second switch, an inductor, an on-time control circuit configured to generate an on-time control signal, a ramp compensation generator configured to generate a compensation signal, a comparing circuit, a logic circuit, a driving circuit and a feed forward circuit configured to generate a compensation control signal based on the input voltage of the switching circuit. The comparing circuit compares the sum of the compensation signal and a feedback signal with a reference signal to generate a comparison signal. Based on the on-time control signal and the comparison signal, the logic circuit generates a control signal with a duty cycle to drive the first and second switches through the driving circuit. The ramp compensation generator adjusts the compensation signal based on the compensation control signal, so the amplitude of the ramp compensation signal can follow a critical value proportional to the difference between the duty cycle and the square of the duty cycle.

Constant on-time switching converter with adaptive ramp compensation and control method thereof

A converter control circuit for converting an input voltage to an output voltage comprises: an error amplifier, coupled to an output voltage or a feedback output signal from the output voltage, and a reference signal, operable to generate an error signal accordingly; a ramp signal generator, generating a first ramp signal and a second ramp signal; a first comparator, coupled to the error signal and the first ramp signal, operable to generate a first comparing signal accordingly; a second comparator, coupled to the error signal and the second ramp signal, operable to generate a second comparing signal accordingly; and a control signal generator, coupled to the first comparing signal and the second comparing signal, operable to generate a control signal to turn switches in the converter circuit ON and OFF accordingly.

Converter circuit and associated method

A control circuit of a DC/DC converter, wherein the DC/DC converter further comprises a high-side switch and a low-side switch, and wherein the DC/DC converter provides an output signal to a load. The control circuit comprises: an amplifier configured to receive a feedback signal and a reference signal to provide an error signal; a ramp generator configured to provide a ramp signal; a comparator configured to receive the ramp signal and the error signal to provide a comparison signal; and a COT generator configured to receive the comparison signal, to provide a COT signal to control the high-side switch and the low-side switch.

Control circuit of a DC/DC converter and the method thereof

Managing user accesses is disclosed, including: generating journal files over a predetermined period of time, wherein a journal file includes merchandise information associated with an accessed webpage; determining, for a merchandise category, information related to an attribute based at least in part on the generated journal files; aggregating information associated with the attribute from journal files associated with the merchandise category, wherein the aggregated information is to be included in a model information group associated with the merchandise category; and returning, in a subsequent search of merchandise information corresponding to the merchandise category, search results that are based at least in part on information associated with the model information group. Conducting searches of merchandise information is disclosed, including: determining a merchandise category associated with a query based at least in part on received keywords associated with the query; retrieving a model information group corresponding to the determined merchandise category; extracting attribute information from the retrieved model information group based at least in part on a quantity associated with an attribute; and presenting the extracted attribute information.

Growing community of inventors

Hangzhou, China

Wei Yuan