초록 ▼

A power supply system for an apparatus (SVR) with a rechargeable battery (B) has its power supply unit (PSU) coupled to the apparatus (SVR) by a two-wire connection (PSA/SVA; PSB/SVB). The power supply unit (PSU) having a flyback converter (DCC) with a transformer (TR) which supplies the battery (B)

A power supply system for an apparatus (SVR) with a rechargeable battery (B) has its power supply unit (PSU) coupled to the apparatus (SVR) by a two-wire connection (PSA/SVA; PSB/SVB). The power supply unit (PSU) having a flyback converter (DCC) with a transformer (TR) which supplies the battery (B) with charging current. The converter (DCC) is stopped periodically during breaks in which the apparatus (SVR) applies a status signal (STS) to the power supply unit via the two-wire connection. The power supply unit detects the status signal by means of a status detector (STD) and depending on the meaning of the status signal it switches the converter to another value of the charging current. When the battery (B) is full, which is detected by a battery management unit (BMU), or when the charging current is too large, which is detected by a comparator (CMP) and a current-sensing resistor (R2), it is thus possible to switch from fast charging to trickle charging. By way of status signal the apparatus (SVR) supplies a voltage pulse to an auxiliary winding (Ls2) of the transformer (TR) by temporarily short-circuiting a rectifier diode (D5) in the secondary circuit by a switching transistor (T) during the current supply breaks.

대표청구항 ▼

[ I claim:] [1.] A power supply system comprising: an apparatus (SVR) with a rechargeable battery (B), and a power supply unit (PSU) with a switched-mode power supply (DCC), which power supply unit (PSU) can be coupled to the apparatus (SVR) to supply current to the apparatus (SVR), characterized in

[ I claim:] [1.] A power supply system comprising: an apparatus (SVR) with a rechargeable battery (B), and a power supply unit (PSU) with a switched-mode power supply (DCC), which power supply unit (PSU) can be coupled to the apparatus (SVR) to supply current to the apparatus (SVR), characterized in that the power supply unit (PSU) comprises means (ICA, EN) for stopping the switched-mode power supply (DCC) during breaks in which no current is supplied to the apparatus (SVR); the apparatus (SVR) comprises means for detecting the breaks in the current supply and means (T, CTL) for transmitting a status signal (STS) to the power supply unit (PSU) during the breaks; and the power supply unit (PSU) comprises means (STD) for detecting the status signal (STS) during the breaks and means (ICA) for changing the current intensity of the current in response to the status signal.