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公开(公告)号：US20230127616A1
公开(公告)日：2023-04-27
申请号：US17802712
申请日：2021-07-14
发明人： Ruiping LI , Jinlong XU , Bin LIU , Wei CHI
摘要： A short-circuit protection circuit, chip and system for a switched-mode power supply are disclosed. The short-circuit protection circuit includes: a sampling module for sampling an input voltage and producing a first voltage from the input voltage; a generation module for generating a second voltage from a reference voltage; a comparison module for comparing the first voltage and the second voltage; and an output module for producing, from a result of the comparison performed by the comparison module, and outputting a control signal for controlling an external power transistor in the event of a short circuit in the switched-mode power supply. According to the present invention, when an output short circuit is detected, a hiccup-mode duty cycle is adjusted according to the input voltage, thus avoiding great energy loss when the input voltage is high and enabling loaded startup or automatic output recovery after the short circuit condition is removed when the input voltage is low.
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公开(公告)号：US20220224340A1
公开(公告)日：2022-07-14
申请号：US17609469
申请日：2021-05-20
发明人： Ruiping LI
IPC分类号： H03K21/08 , H03K17/687
摘要： A counting circuit and a chip are disclosed. The counting circuit includes a charge counter module including a pulse processing module and a first capacitor. The pulse processing module is configured to covert a received pulse signal into a counting current and to transfer the converted counting current to the first capacitor. The first capacitor is configured to receive the counting current and store charge carried in the counting current. The counting circuit takes a voltage of the first capacitor as a basis for counting. The input voltage pulse signal is converted into a current signal in the form of micro pulses for charging the non-variable capacitor, and a counting result is obtained by detecting the voltage of the first capacitor, achieving the following advantages: no need to take care of whether the input pulse signal is continuous or discrete; high resistance to interference; adaptiveness to various input pulse signals of different waveforms and/or with different frequencies; and the ability to solve the problem with the conventional counting circuits that they may not be able to cope with irregular pulse signals and may even not be able to operate normally when such an irregular pulse signal is input.
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公开(公告)号：US20220345153A1
公开(公告)日：2022-10-27
申请号：US17608302
申请日：2020-11-06
发明人： Ruiping LI , Wei CHI , Bin LIU , Jianhu WANG
摘要： A decoding circuit and a chip are disclosed. The decoding circuit includes, connected in a sequence, a charge/discharge unit, a capacitor and a conversion unit. The charge/discharge unit is able to charge and discharge the capacitor, and a ratio of a total time required to transfer any amount of charge into the capacitor to a total time required to transfer the same amount of charge from the capacitor is a predetermined value. The conversion unit is configured to output a third level when a voltage on the capacitor exceeds a predetermined voltage and to otherwise output a fourth level. This arrangement alleviates the computational burden of an MCU, eliminates any adverse effect of noise in a transmitted signal, allows an extended effective transmission distance when using an HBS protocol and is self-adaptive to signals transmitted at different clock rates, thus solving the problems with the prior art including heavy MCU computational burden, a tradeoff between error correction and transmission distance and insufficient adaptiveness to signals transmitted at different clock rates.
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公开(公告)号：US20220263403A1
公开(公告)日：2022-08-18
申请号：US17623082
申请日：2021-07-09
发明人： Ruiping LI , Jinlong XU , Bin LIU , Wei CHI
摘要： A current limit control circuit and a switched-mode power supply chip incorporating the current limit control circuit are disclosed. The current limit control circuit includes an output current sampling module, a first voltage comparator module, a hysteresis comparator module, a logic control module, a capacitor charging/discharging module and a current limit control module. The capacitor charging/discharging module is configured to charge/discharge a capacitor and thus change its output voltage, and the hysteresis comparator module is configured to produce a current limit control signal which allows the switched-mode power supply to output a high current for a specified period of time. Upon elapse of the period, the power transistor is controlled to cause a low current to be output. This ensures that the demand of a load for a transient current is satisfied while ensuring safe and stable operation of the chip for a long time.
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