KR20110047006A - Swiching mode power supply and controlling method thereof - Google Patents

Abstract

PURPOSE: A switching mode power supply device and a controlling method thereof are provided to reduce manufacturing costs by removing a standby power relay and a micro switch. CONSTITUTION: A rectifier(110) rectifies inputted commercial AC power. A smoothing unit(120) smooths the rectified voltage. A transformer(130) transforms the smoothed DC voltage into a plurality of voltages. A control unit(160) generates a first control signal for controlling the external output of a plurality of voltages outputted from the transformer. A switching unit(140) controls the output terminal of the plurality of voltages based on the first control signal.

Description

Switching mode power supply and its control method {SWICHING MODE POWER SUPPLY AND CONTROLLING METHOD THEREOF}

The present invention relates to a switched mode power supply and a control method thereof.

In general, a switching mode power supply (SMPS) converts a commercial AC power (AC) to a suitable DC power supply to supply a system, that is, each load including a control unit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a switching mode power supply device and a control method thereof in which a relay of a power input terminal is removed in a standby mode and the other output stages of the SMPS output terminals are turned off except for the power output terminal applied to the microcomputer.

Another object of the present invention is to provide a switching mode power supply device and a method of controlling the same, which operate the entire system in the state before the power failure without additional operation when recovering after the power failure.

Switching mode power supply apparatus according to an embodiment of the present invention for achieving the above object, the rectifier for rectifying the input commercial AC power; A smoothing unit smoothing the rectified voltage; A transformer for converting the smoothed DC voltage into a plurality of voltages and outputting the converted voltages; A controller configured to generate a first control signal for controlling an external output of a plurality of voltages output from the transformer in the standby mode; And a switch unit configured to control output terminals of the plurality of voltages based on the generated first control signal.

A control method of a switching mode power supply apparatus according to an embodiment of the present invention for achieving the above object comprises the steps of outputting a plurality of voltages by processing a predetermined commercial AC power input; And controlling the output of the plurality of voltages based on the first control signal generated by the controller.

The switching mode power supply apparatus and its control method according to an embodiment of the present invention, by removing the relay of the power input terminal and turning off the remaining output stage except the power output terminal applied to the microcomputer among the SMPS output stage, even if the power is connected to less than 1W Standby power can maintain the standby state.

In addition, the switching mode power supply apparatus and the control method thereof according to an embodiment of the present invention, when the power recovery after the power failure, by operating the entire system in the state before the power failure without further operation of the user, it is possible to improve the ease of use.

In addition, the switching mode power supply apparatus and control method thereof according to an embodiment of the present invention, by removing the relay of the power input terminal, and turns off the remaining output stage other than the power output stage applied to the microcomputer among the SMPS output stage, standby with low power of less than 1W Power and power failure compensation can be provided at the same time.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the configuration and operation according to an embodiment of the present invention.

1 is a block diagram of a switching mode power supply according to an embodiment of the present invention. As shown in the drawing, the switching mode power supply 100 includes a rectifying unit 110, a smoothing unit 120, and a transformer unit. 130, the switch unit 140, the voltage sensing unit 150, and the control unit 160.

The rectifier 110 rectifies a commercial AC power (or AC power) input from the outside.

That is, the rectifier 110 converts the input commercial AC power into DC power (or DC voltage) using a diode rectifier or the like.

In addition, when the power cord of the switching mode power supply device 100 is connected to the terminal of the commercial AC power supply, the rectifier 110 stops supplying power from the outside, such as when a power failure occurs. Except in the case where the commercial AC power is always maintained.

The smoothing unit 120 includes a capacitor or a circuit including the capacitor, and stores and smoothes the DC voltage output from the rectifying unit 110.

At this time, the noise of the input line of the input commercial AC power is prevented from entering the inside of the switching mode power supply 100, and the switching noise inside the switching mode power supply 100 is the commercial AC power. A filter (not shown) may be further included to prevent the inflow of the input line.

For example, the filter may remove the noise of the input commercial AC power and output the noise to the rectifier 110, and the rectifier 110 may be configured to rectify the commercial AC power from which the noise is removed.

The transformer 130 converts the DC voltage output from the smoothing unit 120 into a plurality of driving voltages and outputs the plurality of driving voltages.

For example, when the switching mode power supply device 100 is provided in the washing machine, the transformer 130 may control the control signal generated by the control unit 160 or a microcomputer (not shown) provided in the washing machine. On the basis of this, the voltage output from the smoothing unit 120 is converted into a voltage of 5V, 13.5V, 16.5V, etc. used in the washing machine and outputs the converted voltage.

At this time, a DC stabilizer (not shown) for maintaining the DC link voltage constant based on the input voltage and the input current input to the smoothing unit 120 and the DC link voltage output from the smoothing unit 120 is further. May be included.

Here, the DC stabilizer is connected between the smoother 120 and the transformer 130, and maintains a constant DC link voltage output from the smoother 120 to the transformer 130. Here, the DC stabilizer may be connected in parallel to the smoothing unit 120 and the transformer 130 in advance or may be independently provided in the form of an external device. When the external DC stabilizer is configured, it can be used without connecting the DC stabilizer in the region where normal voltage is supplied, provided that the general control device has a separate slot or connector, and in the region where low voltage occurs or the input power is unstable. Can be used by connecting DC stabilizer.

The switch unit 140 may include a MOS field effect transistor (MOS field effect transistor) connected to each output terminal of the at least one voltage to control the output of at least one voltage output from the transformer unit 130. Or a relay. In addition, the MOS field effect transistor or the relay connected to each voltage output terminal connects or disconnects each voltage output terminal based on the control signal generated by the controller 160.

In addition, the switch unit 140 controls each output terminal of one or more voltages output from the transformer unit 130 under the control of the controller 160 during the normal operation (or the normal operation mode).

For example, when the switching mode power supply device 100 is provided in a washing machine and the washing machine is performing a normal operation such as washing or dehydration, the switch unit 140 may be controlled by the controller 160. 5V power output from the transformer 130 is supplied to a microcomputer (not shown) provided in the washing machine (171), 13.5V power output from the transformer 130 is a pump (pump), clutch ( 16.5V output from the transformer 130 is supplied to a load such as a clutch, a water supply valve, and the like, such as an LED, an intelligent power module (IPM), a buzzer, and the like. Supply 173 to drive the load.

In addition, the switch unit 140 connects only an output terminal of a predetermined output voltage among one or more output voltages output from the transformer unit 130 under the control of the controller 160 in the standby mode. The connection of the other output terminals except the output terminal of the preset output voltage is cut off.

For example, when the switching mode power supply device 100 is provided in the washing machine and the washing machine is in the standby mode, the switch unit 140 is output from the transformer unit 130 under the control of the control unit 160. Among the plurality of output voltages, the output terminal 171 of the 5V voltage supplied to the microcomputer, which is a predetermined output voltage, is connected, and the output terminals of the voltages of 13.5V and 16.5V outputted from the transformer 130 which are the remaining output terminals ( 172 and 173).

The voltage detector 150 detects voltages of one or more output terminals output from the switch unit 140.

In addition, when an event such as sudden braking of the motor, reverse braking occurs between the transformer unit 130 and the switch unit 140, or between the switch unit 140 and the voltage sensing unit 150, the component is burned out. A braking resistor (not shown) may be further included to prevent it.

The controller 160 generates a control signal for controlling the transformer 130 or the switch 140 based on the voltage sensed by the voltage detector 150.

In addition, when the switching mode power supply device 100 is in normal operation, the control unit 160 may include a predetermined DC power (or predetermined) required by an arbitrary device having the switching mode power supply device 100. Generate a control signal for converting the input commercial AC power into a predetermined DC power, and control the transformer 130 or the switching unit 140 based on the generated control signal. do.

In addition, the controller 160 controls the switching unit 140 in a normal operation, and each component is included in each component included in the arbitrary device provided with the switching mode power supply device 100. It is controlled to supply the predetermined voltage required.

In addition, in the standby mode, the controller 160 maintains an output of a predetermined specific voltage among the plurality of voltages transformed by the transformer 130 and outputs an output terminal of the remaining voltage except for the predetermined specific voltage. Generates a control signal for blocking the control, and controls the switching unit 140 based on the generated control signal.

In addition, the controller 160 stores a state of the normal operation or the standby mode, or a driving state (or an operating state) of the device equipped with the switching mode power supply device 100, and restores power after a power failure. At the time, the user may control to proceed with the previous driving state based on the stored operating state or the driving state without additional input (or control) of the user.

That is, the controller 160 rectifies, smoothes, and transforms the input commercial AC power during power recovery after power failure, and outputs a predetermined voltage to an arbitrary device provided with the switching mode power supply device 100.

As such, by the configuration of the switching mode power supply device 100, the power cord of the switching mode power supply device 100 is connected to the terminal of the commercial AC power supply (or the switching mode power supply device 100 ), The microcomputer included in any device provided with the switching mode power supply device 100 is always supplied with a voltage to keep the microcomputer on. have.

In addition, even when the microcomputer is in the normal operation or the standby mode, it is always kept on, and even when in the standby mode, the standby power may be maintained at less than 1 W, and the power failure compensation function may be provided without additional input by the user.

In addition, by removing the standby power relay and the micro switch for controlling the relay to the switching mode power supply device 100, it is possible to reduce the cost and power in the standby mode.

Hereinafter, a method of controlling a switching mode power supply apparatus according to the present invention will be described in detail with reference to FIGS. 1 to 3.

2 is a flowchart illustrating a control method of a switching mode power supply apparatus according to a first embodiment of the present invention.

First, in the standby mode, the controller 160 connects an output terminal of a predetermined voltage among the output terminals of the plurality of voltages output by the transformer 130 and cuts off the remaining output terminals except the output terminal of the preset voltage. Generate a first control signal for. At this time, the plurality of voltages output by the transformer 130 is a DC voltage rectified and smoothed by the rectifier 110 and the smoothing unit 120 with respect to the input commercial AC power of the control unit 160 The voltage is converted into a predetermined voltage and output by the control.

For example, the control unit 160, the switching mode power supply 100 is provided in the washing machine, the voltage of 5V, 13.5V and 16.5V and the like used in the washing machine is output by the transformer 130 In the case of the standby mode, the 5V, 13.5V and 16.5V output by the transformer 130 maintains the connection of the output terminal of 5V connected to drive the microcomputer (not shown) provided in the washing machine In operation S210, a first control signal for blocking output of the remaining voltages 13.5V and 16.5V is generated.

Subsequently, the switch unit 140 controls the MOS field effect transistor or the relay connected to the output terminal of the transformer 130 based on the first control signal output from the controller 160 to provide the switching mode power supply. Control the output voltage to any device connected to the supply device 100.

For example, when the first control signal output from the controller 160 includes the information for maintaining the connection of the output terminal of 5V and blocking the remaining voltages (13.5V and 16.5V), Based on the first control signal, a MOS field effect transistor or a relay connected to the output terminal of the 5V among the output terminals of the transformer 130 is turned on, and a MOS field connected to the respective output terminals of the 13.5V and 16.5V. The effect transistor or the relay is turned off (S220).

Thereafter, the controller 160 checks an operation state, and when the operation state is changed from the standby mode to the normal operation mode, the controller 160 controls the output of the plurality of voltages output by the transformer 130. 2 Generate the control signal.

For example, the control unit 160, the switching mode power supply 100 is provided in the washing machine, the voltage of 5V, 13.5V and 16.5V and the like used in the washing machine is output by the transformer 130. In the normal operation mode, 5V, 13.5V, and 5V output by the transformer 130 to drive at least one of the microcomputer, the pump, the clutch, the water supply valve, the LED, the intelligent power semiconductor module, and the buzzer. In operation S230, a second control signal for connecting or disconnecting an output terminal having a voltage of 16.5V is generated.

Subsequently, the switch unit 140 controls the MOS field effect transistor or the relay connected to the output terminal of the transformer 130 based on the second control signal output from the controller 160 to provide the switching mode power supply. Control the output voltage to any device connected to the supply device 100.

For example, when the second control signal output from the controller 160 includes the information for maintaining the connection between the output terminal of 5V and 16.5V and cutting off the remaining voltage (13.5V), On the basis of the second control signal, the MOS field effect transistor or relay connected to the output terminal of the 5V and 16.5V, respectively, of the output terminal of the transformer 130 is turned on, and the MOS field effect transistor or relay connected to the output terminal of 13.5V. Turn off (S240).

3 is a flowchart illustrating a control method of a switching mode power supply apparatus according to a second embodiment of the present invention.

First, the controller 160 is configured to supply a voltage to an arbitrary device equipped with the switching mode power supply device 100 according to a standby mode or a normal operation mode among a plurality of voltages output by the transformer 130. 1 generates a control signal, controls the switch unit 140 based on the generated first control signal, and controls the output of a plurality of voltages output from the transformer unit 130 to supply voltage to the arbitrary device. Supply. In this case, the controller 160 stores the running state (or operating state) of the arbitrary device when a predetermined time interval or a specific event occurs. In addition, the plurality of voltages output by the transformer 130 are DC voltages rectified and smoothed by the rectifier 110 and the smoother 120, respectively, with respect to the input AC power. The voltage is converted into a predetermined voltage and output by the control.

For example, the controller 160 may include a switching mode power supply device 100 in a washing machine, and voltages such as 5V, 13.5V, and 16.5V used in the washing machine may be output by the transformer 130. When the operation state is the standby mode (only the output terminal of the 5V is connected, the output terminals of the remaining voltage (13.5V and 16.5V) is blocked), the operation state is checked at a predetermined time interval, the standby mode state It is stored in the storage unit (not shown) (S310).

Thereafter, when the power is applied again after a sudden power failure occurs during operation (or driving), the controller 160 supplies a voltage for operating the arbitrary device based on the stored operating state before the power failure.

For example, the control unit 160 may be configured to output a plurality of voltages 5V, 13.5V, and the like, which are output by the transformer 130 based on the stored standby mode state when the standby mode state is restored after a power failure. A second control signal for connecting only the output terminal of 5V and blocking the output terminals of the remaining voltages (13.5V and 16.5V) among 16.5V, etc.), based on the generated second control signal. The control unit 140 controls the operation state before the power failure (or maintains) (S320).

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a block diagram of a switching mode power supply according to an embodiment of the present invention.

2 is a flowchart illustrating a control method of a switching mode power supply apparatus according to a first embodiment of the present invention.

3 is a flowchart illustrating a control method of a switching mode power supply apparatus according to a second embodiment of the present invention.

Claims (11)

Rectifier for rectifying the input commercial AC power; A smoothing unit smoothing the rectified voltage; A transformer for converting the smoothed DC voltage into a plurality of voltages and outputting the converted voltages; A controller configured to generate a first control signal for controlling an external output of a plurality of voltages output from the transformer in the standby mode; And And a switch unit configured to control the output terminals of the plurality of voltages based on the generated first control signal. The method of claim 1, A filter for removing the noise of the input commercial AC power and outputting the noise to the rectifier; And Switching power supply characterized in that it further comprises a voltage sensing unit for sensing the voltage output from the switch unit and outputting to the control unit. The method of claim 1, wherein the control unit, Switching mode power, characterized in that for connecting one or more predetermined output terminals of the output terminal of the plurality of voltages output from the transformer unit, and generating a first control signal for blocking the other output terminals except the predetermined one or more output terminals. Feeding device. The method of claim 3, wherein the one or more predetermined output stage, Switching mode power supply characterized in that it comprises an output terminal is applied to the microcomputer provided with the switching mode power supply. The method of claim 1, wherein the switch unit, And a plurality of MOS field effect transistors (MOSFETs) or relays connected to respective output terminals of the plurality of voltages output from the transformer. Outputting a plurality of voltages by processing a predetermined commercial AC power signal; And And controlling the output of the plurality of voltages based on the first control signal generated by a control unit. The method of claim 6, wherein the outputting of the plurality of voltages comprises: Rectifying and smoothing the input commercial AC power; And And converting the smoothed DC voltage into a plurality of voltages and outputting the plurality of voltages. The method of claim 6, wherein the first control signal, In the standby mode, the switching mode power supply characterized in that the control signal for connecting one or more predetermined output terminals of the output terminal of the output voltage, and cuts off the remaining output terminals other than the predetermined one or more output terminals. Control method. The method of claim 8, wherein the one or more predetermined output stage, And an output terminal applied to the micom provided with the switching mode power supply. The method of claim 6, Storing an operating state at a predetermined time interval; And And controlling the output of the plurality of voltages based on the stored operating state when the power is restored after a power failure. The method of claim 10, wherein the operating state, Control mode of the switching mode power supply characterized in that the standby mode or normal operation mode.

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