US 12,395,063 B1
Control system for a bi-directional totem-pole ac-dc converter
Zhonghui Bing, Rochester Hills, MI (US)
Filed by Zhonghui Bing, Rochester Hills, MI (US)
Filed on Aug. 17, 2023, as Appl. No. 18/234,909.
Claims priority of provisional application 63/399,208, filed on Aug. 18, 2022.
Int. Cl. H02M 1/088 (2006.01); H02M 1/00 (2006.01); H02M 7/797 (2006.01)
CPC H02M 1/088 (2013.01) [H02M 1/0009 (2021.05); H02M 7/797 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A control system for a bi-directional totem-pole AC-DC converter, the converter having a current shaping half-bridge, a line synchronizing half-bridge, and an inductor; the current shaping half-bridge having a high-side switch and a low-side switch being coupled in series between first and second nodes, the line synchronizing half-bridge having a high-side switch and a low-side switch being coupled in series between the first and second nodes, the inductor being coupled to a third node between the high-side switch and the low-side switch of the current shaping half-bridge, comprising:
a first gate driver being electrically coupled to the high-side switch and the low-side switch of the current shaping half-bridge;
a second gate driver being electrically coupled to the high-side switch and the low-side switch of the line synchronizing half-bridge;
a mixed-signal power controller operably coupled to the first and second gate drivers, the mixed-signal power controller having a digital module and an analog module;
the analog module having a current sensor measuring a sensed switch current from the low-side switch of the current shaping half-bridge and generating a current sense voltage based on the sensed switch current;
the digital module having a DC voltage sensor measuring a DC bus voltage across the first and second nodes of the bi-directional totem-pole AC-DC converter and generating a DC sense voltage based on the DC bus voltage;
the digital module having an AC voltage sensor measuring an AC voltage being applied to the bi-directional totem-pole AC-DC converter and generating an AC sense voltage and a binary polarity signal based on the AC voltage, the binary polarity signal indicating a polarity of the AC voltage, the AC sense voltage indicating a magnitude of the AC voltage;
the digital module receiving a power command value and a filtering command value from an external controller;
the digital module determining a feedforward duty cycle value based on the AC sense voltage, the DC sense voltage, and the binary polarity signal;
the digital module generating first and second clock signals based on the feedforward duty cycle value;
the digital module determining a current command value based on the power command value and the filtering command value;
the digital module determining a reference current value associated with the inductor based on the current command value;
the analog module generating a comparator voltage based on a current sensor voltage and a compensation voltage; the compensation voltage being determined based on the reference current value; and
the digital module inducing the first gate driver to output first and second control signals for controlling the high-side switch and the low-side switch respectively of the current shaping half-bridge based on the first and second clock signals and the comparator voltage, such that an average value of an inductor current flowing through the inductor is proportional to the current command value, and the bi-directional totem-pole AC-DC converter outputs a power level corresponding to the power command value.