초록 ▼

Disclosed is a portable charging apparatus having a built-in charging battery, which can easily charge the charging battery of a cellular phone even in a place where home AC power or car power cannot be used and can be used for various kinds of portable equipment by means of using one charger. The p

Disclosed is a portable charging apparatus having a built-in charging battery, which can easily charge the charging battery of a cellular phone even in a place where home AC power or car power cannot be used and can be used for various kinds of portable equipment by means of using one charger. The present invention can charge a charging battery of a cellular phone using home AC power or car power. Furthermore, the charger of the present invention can easily charge the charging batteries of various digital mobile devices such as cellular phones using an internal charging battery included therein even in a place where home AC power or car power cannot be used.

대표청구항 ▼

1. A portable charging apparatus having a built-in charging battery comprising:an AC power connector electrically connected to domestic AC power;an EMI filter for removing a noise component of AC power applied through the AC connector;a rectifier for rectifying the AC power applied from the EMI filt

1. A portable charging apparatus having a built-in charging battery comprising:an AC power connector electrically connected to domestic AC power;an EMI filter for removing a noise component of AC power applied through the AC connector;a rectifier for rectifying the AC power applied from the EMI filter into DC power;a switching mode power supply for regulating the DC power inputted from the rectifier according to a predetermined duty ratio, to output charging current stepped down;an external charging battery connector electrically connected to the charging battery of a cellular phone through an interface connector of the cellular phone;a PWM controller outputting a pulse width modulation signal for controlling a voltage level of a current charging voltage such that the charging voltage supplied to the external charging battery connector reaches a predetermined reference voltage and maintains it based on a predetermined voltage control signal;an internal charging battery for accepting the DC power from the switching mode power supply as charging current to store the electric energy of the DC power and providing the electric energy as charging current of the cellular phone;a transistor for switching electrical connection between the connection node of an output port of the switching mode power supply and the internal charging battery and the external charging battery connector according to the pulse width modulation signal outputted from the PWM controller;a photo-coupler for converting a predetermined current control signal into an optical signal and converting the optical signal into an electric signal to apply it to the switching mode power supply; anda microprocessor for controlling a charging current control operation of the switching mode power supply and a charging voltage control operation of the PWM controller so as to supply charging current with a predetermined voltage level, outputted through the switching mode power supply, to the external charging battery connector and the internal charging battery, the microprocessor outputting the current control signal and voltage control signal to provide the charging current of the internal charging battery to the external charging battery connector,wherein the charging battery connector receives identification data including information about maximum charging voltage and a maximum charging current of a rechargeable battery of the cellular phone through the interface connector of the cellular phone and sends the identification data to the microprocessor, andthe microprocessor reads the identification data to set a maximum charging voltage value and a maximum charging current value of a rechargeable battery and controls the operation of the switching mode power supply and PWM controller based on set maximum charging voltage and maximum charging current values.