The invention provides a
capacitor charging and discharging circuit, a circuit board and equipment, and relates to the technical field of
capacitor charging and discharging, according to the scheme, charging current is output to a super
capacitor through a charging
current limiting module, when the equipment is powered down, a controlled discharging module conducts a discharging loop to start discharging after receiving a corresponding
control signal, and the charging
current limiting module outputs charging current to the super capacitor; and after the equipment finishes data storage, the controlled
discharge module also turns off the
discharge loop according to the corresponding
control signal to stop discharging. According to the scheme, better charging current control can be provided, the problems that the charging current is too small, the charging time is long or the charging current is too large, an over-
current point of an adapter is impacted, and the stability of a mainboard is influenced can be avoided, the discharging requirement can be quickly responded through the controlled discharging module, a discharging path is closed in time after a
system completes necessary actions, and the
system safety is improved. And the possibility of quick re-
electrification without starting up due to slow
discharge is solved. And the application requirements in a high-reliability scene are effectively met.