Power supply control apparatus and method thereof

An apparatus for controlling power to a system controller and a peripheral of a system, comprising:

• a switch turned on/off by a user;
• a first switching unit;
• a pulse width modulation (PWM) portion supplying a pulse signal controlling a switching operation of the first switching unit when a driving voltage is applied;
• a transformer supplying the power in accordance with the switching operation of the first switching unit;
• a driving voltage-applying portion applying the driving voltage to the PWM portion when the switch is turned on;
• and
• a power-off signal detection portion terminating the switching operation of the PWM portion when a power off signal is detected, wherein the system controller generates the power off signal when a predetermined period of time passes after the power output from the transformer is applied and then, a sleep mode is set.

An apparatus for controlling power in a system for transmitting and receiving data through an external communication line, the system having a system controller, the apparatus comprising:

• a switching mode power supply (SMPS) which:
• starts switching power in a primary winding of a transformer to induce power in a secondary winding of the transformer to supply power to the system controller from the secondary winding in response to a first detection signal, and
• stops the switching of the power in the primary winding to stop the supply of power to the system controller in response to a second detection signal;
• a detecting portion which:
• detects a first input signal representing an operation of the system other than an operation of the system controller to generate the first detection signal, and
• detects a second input signal representing an operation of the system controller to generate the second detection signal;
• a first switch, which supplies power to a first input of the SMPS to start the switching of the power in the primary winding in response to the first detection signal;
• and
• a second switch which supplies a voltage to a second input of the SMPS to stop the switching of the power in the primary winding in response to the second detection signal.

An apparatus for controlling power in a system for transmitting and receiving data through an external communication line, the system having a systems controller and at least one peripheral which operates from the controlled power, the apparatus comprising:

• a switching mode power supply (SMPS) comprising:
• a transformer having a primary winding and a secondary winding, a first end of the primary winding being directly connected to a source of DC power,
• a first switch unit coupled to a second end of the primary winding and switching power in the primary winding of the transformer to induce power to the secondary winding in response to a pulse width modulated (PWM) signal, and
• a pulse width modulator which starts the PWM signal in response to a power on signal and stops the PWM signal in response to a power off signal;
• a power on detecting portion which outputs the power on signal in response to an operation of a switch;
• and
• a power off detecting portion which outputs the power off signal in response to an output signal generated by circuitry operating from a voltage induced in the secondary winding.

A power supply apparatus in a system having a system controller and a peripheral which receives and outputs data, the apparatus comprising:

• a rectifier directly coupled to an external power source disposed outside the system and which supplies first DC power;
• a switching mode power supply (SMPS) which converts the first DC power to second DC power, the SMPS comprising:
• a transformer having a primary winding and a secondary winding, the primary winding having a first end connected to the first DC power and a second end,
• a switching element, connected to the second end of the primary winding, which switches a current in the primary winding of the transformer in response to a pulse width modulated waveform, to induce the second DC power in the secondary winding of the transformer, and
• a pulse width modulation (PWM) driver which outputs the pulse width modulated waveform in response to input power being supplied to the PWM driver;
• a control circuit which supplies the input power to the PWM driver from the first DC power in response to a control voltage;
• and
• a switch which supplies the control voltage to the control circuit when the switch is actuated.

A power supply apparatus in a system having a system controller, a peripheral receiving and outputting data, and a switching mode power supply (SMPS) having a primary winding and a secondary winding coupled to the system controller and the peripheral, the apparatus comprising:

• a rectifier directly coupled to an external power source, coupled to a first end of the primary winding of the SMPS;
• a start up switch generating a voltage signal;
• and
• a power off switch generating a power off signal in response to an output of the system controller;
• and
• a control circuit coupled to a second end of the primary winding, supplying power from the rectifier to the primary winding of the SMPS to turn on the SMPS and induce the power to the secondary winding in response to the voltage signal, and terminating the supplying of the power from the rectifier to the primary winding of the SMPS in response to the power off signal.

A power supply apparatus in a system having a system controller, a peripheral receiving and outputting data, comprising:

• a rectifier adapted to be directly coupled to an external power source outside the system;
• a switching mode power supply (SMPS) which supplies power to the system controller and the peripheral, the SMPS comprising:
• a transformer having a primary winding and a secondary winding, the primary winding having a first end coupled to the rectifier and a second end, the secondary winding coupled to the system controller and the peripheral, and
• a control circuit coupled to the secondary winding and coupled between the second end of the primary winding and a predetermined voltage, supplying the power from the rectifier to the primary winding to induce the power to the secondary winding when the control circuit is turned on;
• a detector detecting a ring signal and generating a ring detecting signal;
• and
• a switch coupled between the first end of the primary winding and the control circuit, generating a driving signal to turn on the control circuit in response to the ring detecting signal when the control circuit is turned off.

A method of controlling power in a power supply apparatus of a system having a system controller, a peripheral receiving and outputting data, a rectifier, and a switching mode power supply (SMPS) having a primary winding and a secondary winding, the method comprising:

• generating a power on signal in response to a signal transmitted from outside the system;
• supplying power from the rectifier to the primary winding of the SMPS and inducing the power to the secondary winding in response to the power on signal;
• supplying power to the system controller and the peripheral from the power induced in the secondary winding;
• and
• terminating the supplying of the power from the rectifier to the primary winding in response to a power off signal generated by the system controller.

An apparatus for controlling power to a system having at least a system controller and a peripheral which receives and outputs data, the apparatus comprising:

• a transformer having a primary winding connected to a source of DC power and first and second secondary windings;
• a PWM driver which switches a current in the primary winding to transfer power to the first and second secondary windings in response to first power being applied to the PWM driver;
• a user switch;
• a first electronically operated switch which supplies the first power to the PWM driver from the source of DC power in response to a momentary operation of the user switch;
• a first rectifier which supplies the first power to the PWM driver from the first secondary winding after the momentary operation of the user operated switch;
• a second rectifier which supplies second power to the system controller from the second secondary winding;
• a second electronically operated switch which conducts first power to a control terminal of the PWM driver, to stop the switching of the PWM driver in response to a momentary control signal generated by the system controller, thus stopping the supply of power to the PWM driver, the system controller and the peripheral.