Power supply device provided with voltage controller using reference voltage circuit and current controller, and electronic apparatus with the power supply device

A power supply device comprising:

• a voltage controller;
• and
• at least one current controller,
• wherein the power supply device is configured by connecting the voltage controller and the current controllers in parallel with each other,
• wherein the voltage controller comprises:
• a reference voltage circuit that generates a predetermined reference voltage based on an input voltage;
• a voltage control circuit configured to generate and output an output voltage of the voltage controller based on the input voltage by controlling an output current of the voltage controller so that the output voltage of the voltage controller becomes a voltage substantially corresponding to the reference voltage;
• and
• a first current detector circuit that detects the output current of the voltage controller, and generates and outputs a first current detection signal indicating a value corresponding to the output current of the voltage controller,
• wherein each of the current controllers comprises:
• a second current detector circuit that detects the output current of the current controller, and generates and outputs a second current detection signal indicating a value corresponding to the output current of the current controller:
• and
• a current control circuit configured to control the output current of the current controller so that the second current detection signal substantially becomes a value corresponding to the value indicated by the first current detection signal,
• wherein the current control circuit further comprises a setting circuit that sets a ratio of the output current from the voltage controller to the output current from each of the current controllers into a predetermined value, and
• wherein the setting circuit comprises a first variable resistor that divides the second current detection signal at a predetermined current ratio, and outputs a divided second current detection signal to the current control circuit.

An electronic apparatus comprising a power supply device, wherein the power supply device comprises:

• a voltage controller;
• and
• at least one current controller,
• wherein the power supply device is configured by connecting the voltage controller and the current controllers in parallel with each other,
• wherein the voltage controller comprises:
• a reference voltage circuit that generates a predetermined reference voltage based on an input voltage;
• a voltage control circuit configured to generate and output an output voltage of the voltage controller based on the input voltage by controlling an output current of the voltage controller so that the output voltage of the voltage controller becomes a voltage substantially corresponding to the reference voltage;
• and
• a first current detector circuit that detects the output current of the voltage controller, and generates and outputs a first current detection signal indicating a value corresponding to the output current of the voltage controller,
• wherein each of the current controllers comprises:
• a second current detector circuit that detects the output current of the current controller, and generates and outputs a second current detection signal indicating a value corresponding to the output current of the current controller;
• and
• a current control circuit configured to control the output current of the current controller so that the second current detection signal substantially becomes a value corresponding to the value indicated by the first current detection signal,
• wherein the current control circuit further comprises a setting circuit that sets a ratio of the output current from the voltage controller to the output current from each of the current controllers into a predetermined value, and
• wherein the setting circuit comprises a first variable resistor that divides the second current detection signal at a predetermined current ratio, and outputs a divided second current detection signal to the current control circuit.