A charging circuit (100) comprises a signal detection pin (101), a first signal transmission pin (102), a second signal transmission pin (103), a first signal transmission connection wire (104), a second signal transmission connection wire (105), a first switch (106), a second switch (107), and a detection unit (108), wherein a first terminal of the first switch (106) is connected to the first signal transmission pin (102), and a first terminal of the second switch (107) is connected to the second signal transmission pin (103). The detection unit (108) has a detection terminal connected to the signal detection pin (101) and a control terminal connected to control terminals of the first switch (106) and the second switch (107), and is used to detect a voltage level state of the signal detection pin (101), and to control, according to the voltage level state, an interconnection direction of the first switch (106) and the second switch (107). If a charging interface (201) and a terminal apparatus interface (202) are connected in reverse, the charging circuit (100) can prevent a power supply from a grounded short circuit and a subsequent burnout of a terminal apparatus (800) or a charging apparatus (900), thereby improving electrical safety. The invention further relates to the terminal apparatus (800) and the charging apparatus (900).
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