KR101907094B1 - Power supply apparatus and power supply method therefor - Google Patents

Abstract

The power supply unit includes: an input unit for receiving an AC power and outputting the AC power to a primary side of the transformer; And a switch control signal for controlling at least one first switch included in the input using a voltage level of at least one subsequent node derived from a primary side of the transformer to a secondary side of the transformer, And at least one first switch is included between the AC power source and the primary side of the transformer. According to the power supply apparatus and the method of supplying power thereto, the standby power control function of the electronic apparatus can be provided while simplifying the circuit.

Description

POWER SUPPLY APPARATUS AND POWER SUPPLY METHOD THEREFOR [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply apparatus and a power supply method thereof, and more particularly, to a power supply apparatus having a power control function and a power supply method thereof.

Fig. 1 shows a configuration diagram of a power supply apparatus 100 of a general electronic apparatus.

As can be seen from Fig. 1, the power supply apparatus 100 of a general electronic apparatus receives the AC power source at all times even in the power off state, and inputs the DC power source to the electronic apparatus. In this case, there is a problem that a large amount of standby power is consumed.

 Korean Patent Laid-Open Publication No. 10-2012-0008935 (Standby power cut-off module of electronic equipment, hereinafter referred to as 'prior art') includes a relay provided on each of two lines of AC power supplied to an electronic device, A standby power interruption module of an electronic device capable of interrupting standby power is disclosed. However, according to the related art, it is necessary to provide two relays, and there is a concern that the circuit becomes complicated.

In addition, generally, electronic devices using AC power are supplied with driving power of direct current using a switching mode power supply (SMPS) method or a linear method. However, in the SMPS or linear type, since a plurality of electronic parts for driving a transformer must be used because a transformer is used, the power consumed by these parts and the cost are considerably consumed.

An object of the present invention is to provide a power supply apparatus having a standby power control function of an electronic apparatus while simplifying a circuit and a power supply method thereof.

A power supply apparatus of the present invention includes: an input unit for receiving an AC power and outputting the AC power to a primary side of a transformer; And a switch control signal for controlling at least one first switch included in the input using a voltage level of at least one subsequent node derived from a primary side of the transformer to a secondary side of the transformer, And at least one first switch is included between the AC power source and the primary side of the transformer.

Wherein the control unit compares the voltage level of the first node induced from the primary side of the transformer to the secondary side of the transformer with a predetermined first reference voltage to control the switch And a first controller capable of generating a control signal. In addition, the controller may receive an external signal, and may generate a switch control signal to maintain the at least one first switch in an on state according to an input external signal.

Preferably, the control unit further includes a second controller for generating a preliminary control signal capable of controlling the at least one first switch by using an externally input signal, And is connected to the first node.

The control unit may further include a second switch connected to a secondary side of the transformer and capable of switching to an ON state temporarily when an external signal is input; And a second controller capable of generating a preliminary control signal capable of controlling the at least one first switch. The preliminary control signal may be activated when the second controller determines that the electronic apparatus connected to the power supply apparatus is powered on, and when the electronic apparatus is in the power-on sleep mode, Can be activated by comparing the voltage level of the subsequent second node, which is induced from the primary side of the transformer to the secondary side of the transformer, to a predetermined second reference voltage. In addition, the preliminary control signal can be continuously activated when the electronic device is in the power-on operation mode.

The second controller may further include: a microcomputer; And a DC-DC converter connected to one node of a secondary side of the transformer, wherein when an external signal for switching an electronic device from an OFF state to an ON state is input to the second switch, the DC- And is in an enabled state. In addition, the second controller uses the output of the DC-DC converter as a power signal of the microcomputer, and the micom maintains the enable state of the DC-DC converter.

The preliminary control signal may be coupled to the first node. In addition, when the preliminary control signal is activated, the switch control signal is activated to switch the at least one first switch to the ON state.

Preferably, the first controller generates a switch control signal for switching the at least one first switch to the on-state when the voltage level of the first node is equal to or less than a predetermined first reference voltage do.

The power supply method of the present invention includes the steps of: (a) receiving an AC power and outputting the AC power to a primary side of a transformer; And (b) generating a switch control signal for controlling at least one first switch located on the primary side of the AC power source and the transformer.

Wherein the step (b) comprises the steps of: (b-1) comparing a voltage level of a first node, which is induced from a primary side of the transformer to a secondary side of the transformer, with a predetermined first reference voltage; And (b-2) generating a switch control signal capable of controlling the at least one first switch using the result of the step (b-1). In addition, in the step (b), an external signal may be received and a switch control signal may be generated to maintain the at least one first switch in the ON state according to the inputted external signal. The step (b) may further include generating a preliminary control signal capable of controlling the at least one first switch using an externally input signal, 1 node.

The step (b) may further include the steps of: (b-3) determining whether the electronic device to be powered on is in a power-on sleep mode or an active mode; (b-4) If it is determined in the step (b-3) that the electronic device is in the power-on sleep mode, the voltage of the second node after being induced from the primary side of the transformer to the secondary side of the transformer Comparing the level with a predetermined second reference voltage; (b-5) generating a preliminary control signal capable of controlling the at least one first switch using the result of the step (b-4); (b-6) maintaining the activation of the preliminary control signal and maintaining the ON state of the first switch when the electronic device is in the power-on state as a result of the determination in the step (b-3); (b-7) when an external signal is input, temporarily switching a second switch connected to the secondary side of the transformer to an on state; And (b-8) when an external signal for switching the electronic device from the off state to the on state is input in the step (b-7), the voltage of one node of the secondary side of the transformer is converted into a direct current And a DC-DC converting step of converting the DC voltage into a DC voltage. In addition, when the step (b-8) is performed, the preliminary control signal may be activated.

The preliminary control signal may be coupled to the first node. When the preliminary control signal is activated, the switch control signal is activated to switch the at least one first switch to the ON state.

Further, in the step (b-2), a switch control signal for switching the at least one first switch to the on state is generated when the voltage level of the first node is equal to or lower than a preset first reference voltage .

According to the power supply apparatus and the power supply method of the present invention, it is possible to simplify the circuit and provide the standby power control function of the electronic apparatus.

1 is a configuration diagram of a power supply device of a general electronic device.
2 is a configuration diagram of a power supply device according to a preferred embodiment of the present invention;
Figs. 3A, 3B and 3C are diagrams showing the configuration of the input unit according to the first embodiment, the second embodiment and the third embodiment, respectively. Fig.
4A and 4B are a configuration diagram of an output unit and a control unit according to the first preferred embodiment of the present invention, respectively, and a timing chart of a main node.
5A and 5B are a configuration diagram of an output unit and a control unit according to a second preferred embodiment of the present invention, respectively, and a timing diagram of a main node.
6A and 6B are a configuration diagram of an output unit and a control unit according to a third preferred embodiment of the present invention, respectively, and a timing diagram of a main node.

Hereinafter, a power supply apparatus and a power supply method according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It should be understood that the following embodiments of the present invention are only for embodying the present invention and do not limit or limit the scope of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.

2 is a block diagram of a power supply 200 according to a preferred embodiment of the present invention.

2, the power supply 200 according to the preferred embodiment of the present invention includes input units 210a, 210b and 201c, a transformer T, output units 220a, 220b and 220c, And control units 230a, 230b, and 230c.

The input units 210a, 210b, and 201c receive the AC power and output the AC power to the primary side of the transformer T. However, the input units 210a, 210b, and 201c include at least one first switch SW1.

The output units 220a, 220b and 220c serve to output the output of the secondary side of the transformer T to the electronic equipment. In addition, the control units 230a, 230b, and 230c may control the input units 210a, 210b, and 201c using the voltage levels of at least one node after being induced from the primary side of the transformer T to the secondary side of the transformer T, And a switch control signal S_CON for controlling at least one first switch SW1 included in the second switch SW1.

3A, 3B, and 3C are diagrams showing the configurations of the input units 210a, 210b, and 201c according to the first, second, and third embodiments, respectively.

3A, 3B and 3C, the input units 210a, 210b and 201c include at least one first switch SW1 between the AC power source and the primary side of the transformer T, It is possible to prevent the power from the AC power source from being transmitted to the primary side of the transformer T.

The input units 210a, 210b and 201c of the present invention may include rectifiers 211a, 211b and 211c, smoothing circuits 212a, 212b and 212c and pulse width modulators 213a, 213b and 213c. The rectifiers 211a, 211b, and 211c can use bridge rectifiers 211a, 211b, and 211c and rectify the AC power to the DC power. In addition, the smoothing circuits 212a, 212b, and 212c may use capacitors.

The pulse width modulators 213a, 213b, and 213c have a general function of modulating the width of the output pulse using the voltage of the secondary side of the transformer T or the current of the primary side. It is needless to say that the pulse width modulators 213a, 213b, and 213c also have a general function of starting an operation using the start-up signal when the initial AC power is turned on. The configurations relating to the general functions of these pulse width modulators 213a, 213b and 213c are not shown in Figs. 3A, 3B and 3C. The pulse width modulators 213a, 213b, and 213c may use a dedicated semiconductor chip.

In addition, the pulse width modulators 213a, 213b, and 213c of the present invention can output a signal having a modulated pulse width and input to the transformer T to adjust the output of the transformer T. In addition, the power signal of the pulse width modulators 213a, 213b, and 213c can receive the output using the transformer T. The transformer T samples the outputs of the rectifiers 211a, 211b and 211c using the outputs of the pulse width modulators 213a, 213b and 213c to convert the outputs of the rectifiers 211a, 211b and 211c.

In addition, the input unit 201c according to the third embodiment of the present invention further includes an EMI filter 214c.

However, the input units 210a, 210b, and 201c of the present invention may be configured such that the first switch SW1 is disposed at the end of the smoothing circuits 212a, 212b, and 212c, so that even after the first switch SW1 is turned off, T) can maintain the voltage until some time later.

4A and 4B show a configuration diagram of the output unit 220a and the controller 230a according to the first preferred embodiment of the present invention, respectively, and a timing diagram of the main node.

4A and 4B, in the controller 230a according to the first preferred embodiment of the present invention, the first node N1 may be set as a node that is distributed by a voltage-divider by a resistor . The control unit 230a according to the first embodiment compares the voltage level of the first node N1 after being induced from the primary side of the transformer T to the secondary side of the transformer T with the first reference voltage set in advance And a first controller 231a for generating a switch control signal S_CON capable of controlling at least one first switch SW1. Specifically, the first controller 231a generates a switch control signal S_CON capable of switching the first switch SW1 to the on state when the voltage level of the first node N1 is equal to or lower than the first reference voltage . The activation time of the switch control signal S_CON for keeping the first switch SW1 in the on state is set such that the electronic device connected to the output unit 220a is in the power off state or in the power on state or in the sleep mode, May be set to a short time when it is determined that the voltage level of the first reference voltage is lower than the first reference voltage. That is, the activation time of the switch control signal S_CON for keeping the first switch SW1 in the ON state can be set by the pulse signal in the power-off state or the power-on state or the sleep mode of the electronic apparatus. However, in the operation mode in which the electronic device is in the power-on state, the switch control signal S_CON may be set to be continuously activated irrespective of the voltage level of the first node N1. That is, the first controllers 231a, 231b, and 231c may receive an external signal, and may switch the first switch SW1 to the on state according to the input external signal. S_CON). A signal from the outside can be inputted from an electronic device connected to the power supply device 200 of the present invention or inputted by a remote controller for controlling the electronic device.

The first controller 231a may include a microcomputer (MC), also referred to as an MCU (Micro Controller Unit).

 The microcomputer MC converts a voltage of the first node N1 into a digital signal and outputs a signal by comparing the first reference voltage with an internally set first reference voltage and outputs the output of the microcomputer MC through a photocoupler 232a The first switch SW1 on the primary side of the transformer T is controlled.

5A and 5B show a configuration diagram of the output unit 220b and the controller 230b according to the second preferred embodiment of the present invention, respectively, and a timing diagram of the main node.

5A and 5B, the controller 230b according to the second preferred embodiment of the present invention includes a first controller 231b and a second controller 233b.

The first node N1 may be set to a node that is distributed by a voltage divider by a resistor. The first controller 231b compares the voltage level of the first node N1 after being induced from the primary side of the transformer T to the secondary side of the transformer T with the predetermined first reference voltage, And a switch control signal S_CON for controlling the first switch SW1 of the first switch SW1. The first controller 231b may be configured to include a comparator (Comp). In addition, the comparator (Comp) can be implemented using an operational amplifier. The output of the comparator Comp controls the first switch SW1 on the primary side of the transformer T via the photocoupler 232b.

Specifically, the first controller 231b compares the first reference voltage, which is set by the regulator Reg, with the voltage level of the first node N1 so that the voltage level of the first node N1 is higher than the first reference voltage , It is preferable to generate the switch control signal S_CON capable of switching the first switch SW1 to the ON state.

The second controller 233b serves to generate a preliminary control signal capable of controlling at least one first switch SW1 by using an externally input signal. In addition, the preliminary control signal is preferably connected to the first node N1. That is, the first controller 231b and the second controller 233b are connected in a cascade structure.

The second controller 233b is constituted by an electronic switch such as a transistor and is capable of generating a switch control signal S_CON using an input external signal regardless of the voltage level of the first node N1 . The external signal may be input from an electronic device connected to the power supply device 200 of the present invention or input by a remote controller for controlling the electronic device.

Specifically, the activation time of the switch control signal S_CON for keeping the first switch SW1 in the ON state is controlled by the first controller 231b in the power-off state or the power-on state of the electronic apparatus or the first If the voltage level of the node N1 is judged to be lower than the first reference voltage, it can be set to a short time. That is, the activation time of the switch control signal S_CON for keeping the first switch SW1 in the ON state can be set by the pulse signal in the power-off state of the electronic apparatus, the power-on state, or the sleep mode. However, in the operation mode in which the electronic apparatus is powered on, the switch control signal S_CON may be continuously set to be activated by the second controller 233b regardless of the voltage level of the first node N1. That is, the second controller 233b generates a switch control signal S_CON that allows an external signal to be received and keeps at least one first switch SW1 to be kept on in accordance with the inputted external signal You can do it.

6A and 6B respectively show the configuration of the output unit 220c and the control unit 230c according to the third preferred embodiment of the present invention and the timing chart of the main node.

6A and 6B, the controller 230c according to the third preferred embodiment of the present invention includes a first controller 231c and a second controller 233c.

The first node N1 may be set to a node that is distributed by a voltage divider by a resistor. The first controller 231c compares the voltage level of the first node N1 after being induced from the primary side of the transformer T to the secondary side of the transformer T to a predetermined first reference voltage, And a switch control signal S_CON for controlling the first switch SW1 of the first switch SW1. To this end, the first controller 231c may be configured to include a comparator (Comp). In addition, the comparator (Comp) can be implemented using an operational amplifier. The output of the comparator Comp controls the first switch SW1 on the primary side of the transformer T through the photocoupler 232c.

Specifically, the first controller 231c compares the first reference voltage, which is set by the regulator Reg, with the voltage level of the first node N1 so that the voltage level of the first node N1 is higher than the first reference voltage , It is preferable to generate the switch control signal S_CON capable of switching the first switch SW1 to the ON state.

The second switch SW2 is connected to the secondary side of the transformer T and temporarily switches to an ON state when an external signal is input. The external signal may be input from an electronic device connected to the power supply device 200 of the present invention or input by a remote controller for controlling the electronic device. Whether or not the electronic apparatus to which power is to be supplied by the power supply apparatus 200 of the present invention is switched from the power on state to the power off state and whether the power is switched from the power off state to the power on state is determined by the operation of the second switch SW2 Can be detected by the microcomputer MC of the second controller 233c by key detection (S_KEY).

The second controller 233c includes a microcomputer MC and a DC-DC converter CVT. It is preferable that the DC-DC converter CVT is connected to one node of the secondary side of the transformer T to be supplied with power. An external signal for switching the electronic device from the off state to the on state is inputted and after the second switch SW2 is switched to the on state, the capacitor connected to the DC-DC converter CVT through the second diode D2 And the DC-DC converter CVT is enabled. When the DC-to-DC converter CVT is enabled, the operation of the microcomputer MC is activated by using the output of the DC-DC converter CVT as the power supply signal S_VCC of the microcomputer MC. When the operation of the microcomputer MC is activated, it is preferable to maintain the enable state (EN) of the DC-DC converter CVT via the third diode D3. The microcomputer MC sends a low signal to the third diode D3 and the fourth diode D4 to turn on the second diode D2 when an external signal for switching the electronic device from the on state to the off state is input. The capacitor connected to the DC-DC converter CVT is discharged and the DC-DC converter CVT is disabled. Therefore, the microcomputer MC is inactivated due to no supply of the power source path (S-VCC) from the DC-DC converter (CVT_). Note that, when the second switch SW2 is switched to the ON state, The voltage of the capacitor C3 is inputted to the transistor Q1 through the first diode D1 and the capacitor connected to the DC-DC converter CVT through the second diode D2 is charged.

When an external signal is input to the second switch SW2, the microcomputer MC alternately determines the power-on and off signals of the electronic device. The ON state of the second switch SW2 is temporarily held after the external signal is input.

When the operation of the microcomputer MC is activated and the DC-DC converter CVT is kept in the enabled state, if the load connected to the output of the power supply device 200 is determined to be higher than a predetermined level, It is determined that the electronic device is in the power-on state, and the spare control signal is continuously activated. The continuous activation of the preliminary control signal can be achieved by directly inputting the signal S_Q1 output from the microcomputer MC to the transistor Q1. In addition, when the operation of the microcomputer MC is activated and the enable state (EN) of the DC-DC converter CVT is maintained, if it is determined that the load connected to the output of the power supply device 200 is less than a predetermined level, The microcomputer MC determines that the electronic device is in the power-on sleep mode, and activation of the preliminary control signal is determined by the voltage level of the second node N2. In this manner, power consumption in the sleep mode can be minimized by varying the power supply method according to the mode of the power-on state of the electronic apparatus.

That is, the second controller 233c generates a spare control signal capable of controlling at least one first switch SW1 using the inputted external signal. Specifically, the second controller 233c can be activated when it is determined that the electronic apparatus connected to the power supply apparatus 200 is powered on. The voltage level of the second node N2 after being induced from the primary side of the transformer T to the secondary side of the transformer T is set to a predetermined second reference voltage In comparison, it is possible to activate a spare control signal capable of controlling at least one first switch SW1. Specifically, when the electronic device is in the sleep mode in the power-on state, the spare control signal is activated when the voltage level of the second node N2 is lower than a predetermined second reference voltage. The spare control signal can be continuously activated when the electronic apparatus is in the power-on operation mode. Even when the electronic device is in an operation mode in which the electronic device is in the power-on state, the delay until the stable power is supplied to the secondary side of the transistor T by turning on the first switch SW1 after the second switch is turned on The preliminary control signal is continuously activated. In addition, the preliminary control signal is preferably connected to the first node N1. That is, the first controller 231c and the second controller 233c are connected in a cascade structure.

When the preliminary control signal is activated, the switch control signal S_CON is activated and at least one first switch SW1 is switched to the ON state.

Specifically, the activation time of the switch control signal S_CON for keeping the first switch SW1 in the ON state can be set to a short time in the power-off state of the electronic apparatus, the power-on state, or the sleep mode. That is, the activation time of the switch control signal S_CON for keeping the first switch SW1 in the ON state can be set by the pulse signal in the power-off state of the electronic apparatus, the power-on state, or the sleep mode. However, regardless of the voltage levels of the first node N1 and the second node N2, the switch control signal S_CON is continuously activated by the second controller 233c in the operation mode in which the electronic apparatus is powered on . That is, the second controller 233c generates a switch control signal S_CON for receiving an external signal and for keeping the at least one first switch SW1 on in accordance with the inputted external signal You can do it. Further, in the power off state of the electronic apparatus, the spare control signal is always inactivated.

It is also preferable that the output voltage DC_OUT of the output unit 220c related to the second reference voltage is larger than the output voltage DC_OUT of the output unit 220c related to the first reference voltage. With this setting, the first controller SW1 is switched to the ON state by the first controller 231c in the power-off state of the electronic apparatus, and the second controller 233c performs the operation in the power- And the second controller 233c can switch the first switch SW1 to the ON state. That is, before the voltage of the first node N1 falls to the first reference voltage, the second node N2 falls to the second reference voltage, so that the second controller 233c turns on the first switch SW1 . Therefore, it is possible to maintain the output level output to the electronic apparatus in the sleep mode in the power-on state of the electronic apparatus larger than the power-off state of the electronic apparatus.

Hereinafter, a power supply method according to a first preferred embodiment of the present invention will be described. The power supply method according to the first preferred embodiment of the present invention uses the power supply 200 according to the preferred embodiment described above and uses the output unit 220a and the control unit 230a according to the first embodiment The power supply 200 and the output unit 220a according to the first embodiment and the control unit 230a are all included in the present invention. The power supply method according to the first preferred embodiment of the present invention can use the input units 210a, 210b, and 210c according to the first, second, and third embodiments.

The power supply method according to the first preferred embodiment of the present invention includes a step S110 of receiving an AC power and outputting the AC power to a primary side of the transformer T and a step S110 of alternately supplying at least one And generating a switch control signal S_CON for controlling the first switch SW1 (S120).

Specifically, the step S120 includes a step S121 of comparing the voltage level of the first node N1 after being induced from the primary side of the transformer T to the secondary side of the transformer T, with a predetermined first reference voltage, And a step S122 of generating a switch control signal S_CON capable of controlling at least one first switch SW1 using the result of step S121. That is, in step S122, when the voltage level of the first node N1 is equal to or lower than the preset first reference voltage, the switch control signal S_CON for switching the at least one first switch SW1 to the on state is generated .

In addition, the step S120 further includes a step (S123) of generating a spare control signal capable of controlling at least one first switch SW1 using the inputted external signal.

 The step S123 is characterized in that an external signal is inputted and a switch control signal S_CON is generated so as to keep the at least one first switch SW1 in an on state depending on the inputted external signal.

A power supply method according to a second preferred embodiment of the present invention will now be described. The power supply method according to the second preferred embodiment of the present invention uses the power supply 200 according to the preferred embodiment described above and uses the output unit 220b and the control unit 230b according to the second exemplary embodiment The power supply device 200, the output unit 220b according to the second embodiment, and the control unit 230b are all included. The power supply method according to the second preferred embodiment of the present invention may use the input units 210a, 210b, and 201c according to the first, second, and third embodiments.

The power supply method according to the second preferred embodiment of the present invention includes a step S210 of receiving an AC power and outputting the AC power to the primary side of the transformer T and a step S210 of alternately supplying the AC power and at least one And a step S220 of generating a switch control signal S_CON for controlling the first switch SW1.

Specifically, step S220 includes a step S221 of comparing the voltage level of the first node N1 after being induced from the primary side of the transformer T to the secondary side of the transformer T, with a predetermined first reference voltage, And a step S222 of generating a switch control signal S_CON capable of controlling at least one first switch SW1 using the result of step S221. Specifically, in step S222, a switch control signal S_CON for switching at least one first switch SW1 to an on-state is generated when the voltage level of the first node N1 is equal to or lower than a preset first reference voltage .

The step S220 may further include a step (S223) of generating a spare control signal capable of controlling at least one first switch SW1 using an externally input signal. In addition, the preliminary control signal is connected to the first node N1.

The step S223 is characterized in that an external signal is received and a switch control signal S_CON is generated so as to keep the at least one first switch SW1 in an on state depending on the inputted external signal.

Hereinafter, a power supply method according to a third preferred embodiment of the present invention will be described. The power supply method according to the third preferred embodiment of the present invention uses the power supply 200 according to the preferred embodiment described above and uses the output unit 220c and the controller 230c according to the third exemplary embodiment The power supply 200, the output unit 220c according to the third embodiment, and the control unit 230c are all included. The power supply method according to the third preferred embodiment of the present invention can use the input units 210a, 210b, and 201c according to the first, second, and third embodiments.

The power supply method according to the third preferred embodiment of the present invention includes a step S310 of receiving an AC power and outputting the AC power to the primary side of the transformer T and a step S310 of alternately supplying the AC power and the at least one And a step S320 of generating a switch control signal S_CON for controlling the first switch SW1.

Specifically, the step S320 includes a step S321 of comparing the voltage level of the first node N1, which has been induced from the primary side of the transformer T to the secondary side of the transformer T, with a predetermined first reference voltage, And generating (S322) a switch control signal S_CON capable of controlling at least one first switch SW1 using the result of step S321. That is, in step S322, when the voltage level of the first node N1 is equal to or lower than the preset first reference voltage, the switch control signal S_CON for switching the at least one first switch SW1 to the on state is generated . In step S322, a switch control signal S_CON for switching the at least one first switch SW1 to the on state is generated when the voltage level of the first node N1 is equal to or lower than a predetermined first reference voltage .

In step S320, when the external signal is input, the second switch SW2 temporarily connected to the secondary side of the transformer T is switched to the on state (S323). In step S323, the electronic device is switched from the off state DC conversion for converting the voltage of one node of the secondary side of the transformer to DC and activating the microcomputer MC when an external signal for switching to the ON state is inputted in step S324, A step S325 of judging whether the electronic apparatus to which power is to be supplied is in a power-on sleep mode or an operation mode when an external signal for switching the apparatus from an off state to an on state is inputted; The voltage level of the second node N2 after being induced from the primary side of the transformer T to the secondary side of the transformer T is compared with the preset second reference voltage when the device is in the power- Using the result of step (S327) and step S327 may further includes the step (S328) for generating a pre-control signal to control at least one of the first switch (SW1). Further, when step S324 is performed, the spare control signal can be activated.

If it is determined in operation S323 that the electronic device is in the power-on state, the operation of maintaining the activation of the spare control signal to maintain the ON state of the first switch SW1 is performed (S329) .

The power supply method according to the third preferred embodiment of the present invention preferably further includes a DC-to-DC conversion step (S330) of converting the voltage of one node of the secondary side of the transformer T to DC . If it is determined in step S324 that the external signal input in step S324 is a signal for turning on the power of the electronic device, step S330 may be performed.

Further, it is preferable that the spare control signal is connected to the first node N1. In addition, when the preliminary control signal is activated, the switch control signal S_CON is activated so that at least one first switch SW1 is switched on.

As described above, according to the power supply apparatus 200 and the power supply method of the present invention, it can be seen that the circuit can be simplified and the standby power control function of the electronic apparatus can be provided.

100, 200: Power supply
110, 210a, 210b, 201c: Input unit T: Transformer
220a, 220b and 220c: Outputs 230a, 230b and 230c:
111, 211a, 211b, 211c: Rectifiers 112, 212a, 212b, 212c:
113, 213a, 213b, and 213c: a pulse width modulator
214c: EMI filter
231a, 231b, 231c: first controller 232a, 232b, 232c: photo coupler
233b, 233c:
Reg: Regulator MC: Microcomputer
Comp: Comparator CVT: DC-DC converter
SW1: first switch SW2: second switch
N1: first node N2: second node
S_CON: Switch control signal

Claims (22)

In a power supply,
An input unit for receiving the AC power and outputting the AC power to the primary side of the transformer; And
And a control unit operable to generate a switch control signal for controlling at least one first switch included in the input unit by using a voltage level of at least one node after being induced from a primary side of the transformer to a secondary side of the transformer, ; ≪ / RTI >
Wherein the at least one first switch comprises:
At least one between the AC power source and the primary side of the transformer,
Wherein,
A second switch connected to the secondary side of the transformer and capable of switching to an ON state temporarily when an external signal is input; And
And a second controller capable of generating a preliminary control signal capable of controlling the at least one first switch,
The preliminary control signal includes:
Wherein the controller is operable when the second controller determines that the electronic apparatus connected to the power supply apparatus is in the power-on state, and when the electronic apparatus is in the power-on sleep state, And comparing the voltage level of a subsequent second node that is induced to the secondary side of the transformer with a predetermined second reference voltage. The method according to claim 1,
Wherein,
Comparing a voltage level of a subsequent first node induced from a primary side of the transformer to a secondary side of the transformer to a predetermined first reference voltage to generate a switch control signal capable of controlling the at least one first switch And a second controller that is operable to control the power supply. 3. The method of claim 2,
Wherein,
Wherein the switch control signal generating unit is capable of generating a switch control signal that can receive an external signal and keep the at least one first switch in an on state according to an input external signal. 3. The method of claim 2,
Wherein the second controller generates the preliminary control signal using an externally input signal,
And the spare control signal is coupled to the first node. delete delete The method according to claim 1,
The preliminary control signal includes:
Wherein the electronic device is continuously activated when the electronic device is in an operation mode in a power-on state. The method according to claim 1,
Wherein the second controller comprises:
A microcomputer; And
And a DC-DC converter connected to one node of the secondary side of the transformer,
And the DC-DC converter is enabled when an external signal for switching the electronic device from the OFF state to the ON state is input to the second switch. 9. The method of claim 8,
Wherein the second controller uses the output of the DC-DC converter as a power signal of the microcomputer,
Wherein the microcomputer maintains the enable state of the DC-DC converter. 10. The method of claim 9,
And the spare control signal is coupled to the first node. 11. The method of claim 10,
Wherein when the preliminary control signal is activated, the switch control signal is activated so that the at least one first switch is switched on. 3. The method of claim 2,
Wherein the first controller comprises:
And generates a switch control signal for switching the at least one first switch to the on state when the voltage level of the first node is equal to or less than a preset first reference voltage. In the power supply method,
(a) receiving AC power and outputting the AC power to the primary side of the transformer; And
(b) generating a switch control signal for controlling the AC power source and at least one first switch located on a primary side of the transformer,
The step (b)
(b-3) determining whether the electronic device to be supplied with power is in a power-on sleep mode or an operation mode;
(b-4) If it is determined in the step (b-3) that the electronic device is in the power-on sleep mode, the voltage of the second node after being induced from the primary side of the transformer to the secondary side of the transformer Comparing the level with a predetermined second reference voltage; And
(b-5) generating a preliminary control signal capable of controlling the at least one first switch using the result of the step (b-4). 14. The method of claim 13,
The step (b)
(b-1) comparing a voltage level of a subsequent first node, which is induced from a primary side of the transformer to a secondary side of the transformer, with a predetermined first reference voltage; And
(b-2) generating a switch control signal capable of controlling the at least one first switch using the result of the step (b-1). 15. The method of claim 14,
The step (b)
And a switch control signal for receiving an external signal and for continuously maintaining the at least one first switch in an on state in accordance with an inputted external signal. 15. The method of claim 14,
In the step (b-5), the preliminary control signal is generated using an externally input signal,
And the preliminary control signal is coupled to the first node. delete 14. The method of claim 13,
The step (b)
(b-6) maintaining the activation of the preliminary control signal and maintaining the on-state of the first switch when the electronic device is in the power-on state as a result of the determination in the step (b-3) ≪ / RTI > 19. The method of claim 18,
The step (b)
(b-7) when an external signal is input, temporarily switching a second switch connected to the secondary side of the transformer to an on state; And
(b-8) When an external signal for switching the electronic device from the off-state to the on-state is input in the step (b-7), the DC voltage of one node of the secondary side of the transformer is converted into DC - a DC conversion step,
Wherein when the step (b-8) is performed, the preliminary control signal can be activated. 20. The method of claim 19,
And the preliminary control signal is coupled to the first node. 21. The method of claim 20,
Wherein when the preliminary control signal is activated, the switch control signal is activated so that the at least one first switch is switched on. 15. The method of claim 14,
The step (b-2)
And generates a switch control signal for switching the at least one first switch to the on state when the voltage level of the first node is equal to or lower than a preset first reference voltage.

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