Power regulation apparatus, dual-battery charging apparatus and charging current regulation method

A dual-battery charging apparatus, comprising:

• a first converter comprising an input terminal for receiving a bus voltage, and an output terminal connected to a first battery;
• and
• a second converter comprising an input terminal for receiving the bus voltage, and an output terminal connected to the first battery, wherein the output terminal of the first converter and the output terminal of the second converter are connected to a second battery via a power regulation apparatus comprising:
• a first switch;
• and
• a switch control signal generation unit comprising:
• a first transconductance unit comprising a first input terminal for receiving a first voltage from a first terminal of the first switch, a second input terminal for receiving a second voltage from a second terminal of the first switch, and an output terminal for being connected to a first node;
• a node voltage generation unit connected to the first node and configured to generate a node voltage signal at the first node;
• and
• a second transconductance unit comprising a first input terminal for receiving a current characterization signal characterizing a current flowing through the first switch, a second input terminal for being connected to the first node to receive a node voltage signal, and an output terminal for being connected to a control terminal of the first switch.

A charging current regulation method, comprising:

• in a battery system comprising a first battery and a second battery connected in parallel, receiving a first voltage of a first battery and a second voltage of a second battery, and converting a voltage difference between the first voltage and the second voltage into a first current signal;
• converting the first current signal into a node voltage signal;
• and
• receiving a current characterization signal characterizing a battery charging current and the node voltage signal and outputting a switch control signal for controlling a first switch so that power generated by the first switch is constant, wherein the first switch is connected between the first battery and the second battery.