Electronic apparatus for generating a pulse width modulation and power controlling method thereof

Patent metadata

Field	Value
Publication number	US-9559599-B2
Application number	US-201414306682-A
Country	US
Kind code	B2
Filing date	Jun 17, 2014
Priority date	Nov 12, 2013
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

An electronic apparatus includes a system portion configured to operate with a received voltage, and a power supply including a pulse width modulation (PWM) generator to generate a PWM signal, a converter to transfer voltage from a primary side to a secondary side in accordance with an output voltage of the PWM generator, and an output portion to supply voltage at the secondary side as standby voltage to the system portion, the PWM generator receives feedback on the standby voltage at the secondary side of the converter, the PWM signal is turned on/off in accordance with levels of the standby voltage at the secondary side, and voltage being supplied to components, except, when the PWM signal is turned off, voltage at the secondary side is only supplied to a component that monitors the feedback of the standby voltage.

First claim

What is claimed is:

1. An electronic apparatus comprising:
a system portion configured to operate with a received voltage; and
a power supply, the power supply comprising:
a pulse width modulation (PWM) generator configured to generate a PWM signal;
a converter configured to transfer voltage from a primary side to a secondary side in accordance with an output voltage of the PWM generator;
an output portion configured to supply voltage at the secondary side of the converter as a standby voltage to the system portion; and
a controller configured to monitor the standby voltage at the secondary side of the converter and voltage of the system portion, and output a wake-up signal to the PWM generator when an external input signal is received from the system portion,
wherein the PWM generator operates under an ON/OFF control mode to perform an intermittent PWM operation by receiving feedback on the standby voltage at the secondary side of the converter, the PWM signal is turned on/off in accordance with levels of the standby voltage at the secondary side, and the voltage being supplied to components, except, when the PWM signal is turned off, the voltage on the secondary side is only supplied to a component configured to monitor the feedback of the standby voltage,
wherein the system portion applies the external input signal to the controller before a point of time when an output current of the power supply is varied, and, in response to the wake-up signal, the PWM generator is woken up and switched from the ON/OFF control mode to a high speed PWM mode so that the PWM generator is controlled to continuously perform the PWM operation rather than the intermittent PWM operation, and
wherein the controller generates a signal for turning on the output voltage needed for the system portion in response to determining that the standby voltage is stably supplied after switching to the high speed PWM mode and the electronic apparatus is switched to a normal mode.

2. The electronic apparatus according to claim 1 , wherein the PWM signal is turned on if the standby voltage at the secondary side is equal to or lower than a first reference voltage, and turned off if the standby voltage at the secondary side is higher than a second reference voltage during the operation under the ON/OFF control mode.

3. The electronic apparatus according to claim 1 , wherein the power supply further comprises a switch configured to operate in accordance with outputs of the PWM generator, and the switch has a nonlinear switching cycle in accordance with voltage levels at the secondary side of the converter during the operation under the ON/OFF control mode.

4. The electronic apparatus according to claim 1 , wherein the external input signal is input in response to releasing the system portion from a standby mode.

5. The electronic apparatus according to claim 1 , wherein the PWM generator continuously generates the PWM signal during the operation under the high speed PWM mode.

6. The electronic apparatus according to claim 5 , wherein the generated PWM signal has a high speed frequency.

7. A power controlling method of an electronic apparatus comprising a system portion configured to operate with received voltage, and a power supply comprising a pulse width modulation (PWM) generator generating a PWM signal and supply standby power to the system portion, the method comprising:
monitoring a standby voltage at a secondary side of a converter that transfers a voltage from a primary side to the secondary side in accordance with output voltages of the PWM generator;
operating under an ON/OFF control mode to perform an intermittent PWM operation by controlling the PWM signal to be turned on/off in accordance with levels of the standby voltage at the secondary side of the converter;
receiving an external input signal from the system portion by the power supply, the external input signal being applied to a controller of the power supply before a point of time when an output current of the power supply is varied;
outputting a wake-up signal to the PWM generator in response to the external input signal;
in response to the wake-up signal, waking up the PWM generator and switching from the ON/OFF control mode to a high speed PWM mode so that the PWM generator is controlled to continuously perform the PWM operation rather than the intermittent PWM operation; and
generating a signal for turning on the output voltage needed for the system portion in response to determining that the standby voltage is stably supplied after switching to the high speed PWM mode and switching the electronic apparatus to a normal mode,
wherein, when the PWM signal is turned off, the voltage at the secondary side is only supplied to a component configured to monitor the feedback of the standby voltage during the operation under the ON/OFF control mode.

8. The method according to claim 7 , wherein the controlling the PWM signal to be turned on/off comprises turning on the PWM signal if the standby voltage at the secondary side is equal to or lower than a first reference voltage, and turning off the PWM signal if the standby voltage at the secondary side is higher than a second reference voltage during the operation under the ON/OFF control mode.

9. The method according to claim 7 , wherein the power supply further comprises a switch operating in accordance with outputs of the PWM generator, and
the switch has a nonlinear switching cycle in accordance with standby voltage levels at the secondary side of the converter during the operation under the ON/OFF control mode.

10. The method according to claim 7 , further comprising monitoring a voltage of the system portion.

11. The method according to claim 7 , wherein the external input signal is input in response to releasing the system portion from a standby mode.

12. The method according to claim 7 , further comprising:
continuously generating the PWM signal during the operation under the high speed PWM mode.

13. The method according to claim 12 , wherein the generated PWM signal has a high speed frequency.

14. A power supply, comprising:
a pulse width modulation (PWM) generator configured to generate a PWM signal;
a converter configured to transfer a voltage generated in accordance with the PWM signal from a first side of the power supply to a second side of the power supply;
an output portion configured to rectify the voltage at the second side to output a standby voltage; and
a controller configured to monitor the standby voltage at the secondary side of the power supply and output a wake-up signal to the PWM generator when an external input signal is received from a system portion,
wherein the PWM generator operates under an ON/OFF control mode to perform an intermittent PWM operation by receiving feedback of the standby voltage from the second side and turns the PWM signal on or off in accordance with the feedback of the standby voltage,
the PWM signal is turned on if the feedback of the standby voltage at the second side is equal to or lower than a first threshold voltage,
the PWM signal is turned off if the feedback of the standby voltage at the second side is higher than a second threshold voltage,
wherein the external input signal is applied before a point of time when an output current of the power supply is varied, and, in response to the wake-up signal, the PWM generator is woken up and switched from the ON/OFF control mode to a high speed PWM mode so that the PWM generator is controlled to continuously perform the PWM operation rather than the intermittent PWM operation, and
wherein the controller generates a signal for turning on

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Jin-Hyung
• Chang Gil-Yong

Classifications

• H02M3/33523 Primary

  with galvanic isolation between input and output of both the power stage and the feedback loop · CPC title

• H02M2001/0032

  Electricity · mapped topic

• Y02B70/16

  Cross-Sectional Technologies · mapped topic

• H02M2001/0035

  Electricity · mapped topic

• H02M3/28 Primary

  using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC · CPC title