Halo Microelectronics International

Kien Chan Vi

Lijie Zhao

Hai Tao

Suming Lai

Kenneth Chung-Yin Kwok

Anan Xiang

A method includes connecting an output of a switched capacitor converter to a battery, the switched capacitor converter comprising a first switch, a second switch, a third switch and an upper circuit connected in series, and a flying capacitor connected between a common node of the first switch and the second switch, and a common node of the third switch and the upper circuit, in a first short circuit testing step, determining whether the third switch is shorted by comparing a voltage on the common node of the third switch and the upper circuit with a first predetermined voltage reference, and in a second short circuit testing step, determining whether the first switch and the second switch are shorted by comparing a voltage on the common node of the first switch and the second switch with a second predetermined voltage reference and a third predetermined voltage reference, respectively.

Short circuit detection apparatus and control method for switched capacitor converter

An apparatus includes a plurality of binary weighted capacitors coupled between a first input terminal of a comparator and a plurality of signal buses, wherein the plurality of binary weighted capacitors has a binary weight increasing by two times from a first capacitor to an (N&#x2212;K)th capacitor, and a constant binary weight from the (N&#x2212;K)th capacitor to a (N&#x2212;K&#x2212;2+2)th capacitor, an offset voltage generator configured to generate a digitally controlled offset voltage having 2steps fed into a second input terminal of the comparator, and a successive approximation logic block configured to receive an output signal of the comparator, and generate an N-bit control signal for controlling the plurality of binary weighted capacitors.

ADC apparatus and control method

A method includes connecting an input voltage bus of a switched capacitor converter to a power source through a load switch, in a first short circuit testing step, determining whether the load switch or a second switch is shorted by comparing a voltage on the input voltage bus with a first predetermined voltage reference, after passing the first short circuit testing step, in a second short circuit testing step, determining whether a first switch or a fourth switch is shorted by comparing a voltage on the common node of the third switch and the fourth switch with a second predetermined voltage reference, and after passing the second short circuit testing step, in a third short circuit testing step, determining whether a third switch is shorted by comparing the voltage on the common node of the third switch and the fourth switch with a third predetermined voltage reference.

A method of converting an analog input signal to a digital output signal includes adding a digitally controlled offset voltage into a comparison stage of a successive approximation analog-to-digital converter circuit, wherein the digitally controlled offset voltage has a periodic pattern including at least 2steps, each of which has a value equal to an integer multiplying 2of an analog voltage corresponding to a least significant bit (LSB) of an N-bit digital signal, operating the successive approximation analog-to-digital converter circuit to sequentially generate at least a 2number of N-bit digital signals based on the at least 2steps of the digitally controlled offset voltage, summing the at least the 2number of N-bit digital signals to obtain a summing result, and dividing the summing result through a divider block to obtain a digital signal having (N+K) bits.

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Kien Chan Vi