Patent ID: 11894773
Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The buck-boost circuit according to claim 2, further comprising:
a control module configured to control switches based on a relationship between an output voltage Vout and a target voltage Vtar and a relationship between the target voltage Vtar and an input voltage VBAT,
wherein said controlling the switches comprises:
in response to Vout<Vtar−ΔV and Vtar<VBAT being satisfied, turning off the fourth switch, and turning on the second switch and the seventh switch to charge the second capacitor connected to an output terminal of the buck-boost circuit; and turning off the seventh switch to enter a first operation mode in response to Vout=Vtar−ΔV being satisfied, wherein ΔV denotes a set voltage difference;
turning on the second switch, the third switch, and the seventh switch to charge the second capacitor in response to both Vout<Vtart−ΔV and Vtar>VBAT being satisfied; in response to Vout=VBAT being satisfied, turning off the second switch and the third switch, and simultaneously turning on the first switch to charge the second capacitor through the first capacitor; and turning off the first switch and the seventh switch to enter the first operation mode in response to Vout=Vtart−ΔV being satisfied;
turning on the seventh switch and the fourth switch to perform discharging in response to Vout>Vtar+ΔV being satisfied, and turning off the seventh switch and the fourth switch to enter the first operation mode in response to Vout=Vtar+ΔV being satisfied; and
entering the first operation mode in response to Vtar−ΔV≤Vout≤Vtar+ΔV being satisfied; and
wherein the first operation mode comprises:
in response to Vtar<VBAT−ΔV being satisfied, turning off the first switch and the third switch, and complementarily turning on the second switch and the fourth switch, wherein ΔV denotes the set voltage difference;
in response to VBAT−ΔV≤Vtar≤VBAT+ΔV being satisfied, turning off the first switch, the third switch, and the fourth switch, and turning on the second switch; and
in response to Vtar>VBAT+ΔV being satisfied, turning off the fourth switch, enabling the second switch and the third switch to operate simultaneously, and complementarily turning on the second switch and the first switch.