KR20060036812A - Apparatus for reducing stand-by electric power for switching mode power supply - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a standby power reduction device, and more particularly, to a standby power reduction device and a method of a switching mode power supply device capable of reducing standby power of a switching mode power supply device used in home appliances. To this end, the present invention converts a DC voltage obtained by rectifying and smoothing according to an input first or second control signal to a load demand voltage or a large voltage higher than the load demand voltage, and then down-converts to a predetermined level to output the switching mode power supply. An apparatus; Outputs the first control signal to the switching mode power supply in the operation mode, and outputs the second control signal in the standby mode to receive the voltage output from the switching mode power supply and operate in the operation mode and the standby mode accordingly. It is characterized by consisting of the system of the load.

Description

Apparatus and method for reducing standby power of switching mode power supply unit {APPARATUS FOR REDUCING STAND-BY ELECTRIC POWER FOR SWITCHING MODE POWER SUPPLY}

1 is a configuration diagram showing the configuration of a conventional switching mode power supply.

Figure 2 is a waveform diagram showing the output voltage and the loss of the switching mode power supply in the normal operation mode.

Figure 3 is a waveform diagram showing the output voltage and the loss of the switching mode power supply in the standby mode of the conventional switching mode power supply.

Figure 4 is a block diagram showing a standby power reduction device of the switching mode power supply according to an embodiment of the present invention.

5 is a waveform diagram showing the output voltage waveform of the charging and discharging unit and the switching section of the switching mode power supply device in FIG.

6 is a flowchart illustrating a method for reducing standby power of a switching mode power supply according to an exemplary embodiment of the present invention.

*** Explanation of symbols for main parts of drawing ***

20: switching mode power supply device 21: DC voltage generator

23: charge and discharge unit 25: switch unit

27: DC / DC converter 30: system

31: main system 33: standby system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a standby power reduction device, and more particularly, to a standby power reduction device and a method of a switching mode power supply device capable of reducing standby power of a switching mode power supply device used in home appliances.

In general, a switching mode power supply (SMPS) applied to household appliances supplies a moderate level of direct current power (DC) to a system, that is, a control unit and each load by switching the AC power. do.

Such household appliances perform an operation mode for performing a corresponding function and a standby mode for receiving a key input or waiting for a remote control signal to perform the operation mode after the operation mode ends. Here, the operation mode and the standby mode is made by supplying the DC power according to the operation of the switching mode power supply to the system.

1 is a configuration diagram showing the configuration of a conventional switching mode power supply.

1, the rectifier 11 for rectifying the commercial AC power to output a DC level power; A smoothing part 13 for smoothing the ripple component by removing the ripple component from the DC level power supply of the rectifying part 11; A transformer unit 15 for transforming the smoothed DC voltage of the smoother unit 13; A charge / discharge unit 17 for charging and discharging the smoothed DC voltage of the transformer unit 15; The switching mode controller 19 controls the smoothed DC power to flow intermittently in the transformer unit 15 by driving the transformer unit 15 in a switching mode according to the DC voltage fed back from the charge / discharge unit 17. It is composed of Here, the charge and discharge unit 17 is a capacitor.

2 is a waveform diagram showing an output voltage and a loss of a switching mode power supply in a general operation mode.

Referring to FIG. 2, the switching mode power supply applies an operating voltage having a small ripple close to 5V as indicated by reference numeral ⓐ to a system having 5V as an operating voltage. At this time, the switching mode power supply 10 repeats the on / off for a certain period, and has a loss as indicated by ⓑ.

On the other hand, while lowering to less than 1 Watt (Watt) which is a standard for standby power of home appliances, the conventional switching mode power supply 10 uses a burst mode or a pulse skipping mode to increase efficiency. use. Here, the burst mode or the pulse skipping mode is a method in which the efficiency of efficiency can be reduced by reducing the operating time of the switching mode power supply 10 instead of increasing the ripple fluctuation range of the output voltage.

Figure 3 is a waveform diagram showing the output voltage and the loss of the switching mode power supply in the standby mode of the conventional switching mode power supply.

Referring to FIG. 3, first, the switching mode power supply 10 has a pause period B for shutting down the operating voltage in the standby mode, and the ripple fluctuation range after the pause period B is adjusted. It has a section A for applying a voltage to increase.

That is, the charge / discharge unit 17 charges the ripple voltage between 4.5 and 5.5V during the section A where a ripple voltage having a variation range between 4.5 and 5.5V is applied. Thereafter, the charge / discharge unit 17 discharges the charged voltage during the section B. At this time, since the ripple voltage applied to the system during the section A is a voltage between 4.5 ~ 5.5V, after the section B of the rest period, the point A is repeated again, the voltage discharged by the charging and discharging unit 17 is It is time to reach 4.5V.

As a result, the conventional switching mode power supply device can control the standby mode differently from the operation mode as described above, thereby increasing the efficiency of the switching mode power supply device while reducing the power consumption.

However, the conventional switching mode power supply operating as described above can increase the efficiency of the switching mode power supply compared to the operation mode through the burst mode or the pulse skipping mode in the standby mode. In this case, there is a problem that it is impossible to meet the specifications for standby power without improving the conventional switching mode power supply method of 0.5 watts. In addition, there is a problem that the efficiency of the switched-mode power supply is inferior.

Accordingly, the present invention has been made to solve the above problems, by increasing the capacitor withstand voltage at the output terminal of the switching mode power supply in the standby mode to increase the output voltage of the capacitor, It is an object of the present invention to provide an apparatus and method for reducing standby power of a switched mode power supply device capable of reducing standby power.

In addition, an object of the present invention is to provide an apparatus and method for reducing standby power of a switching mode power supply device by increasing the capacitor breakdown voltage of the switching mode power supply device so as to cope with standardized standby power regardless of the power consumption of the system. .

In addition, another object of the present invention is to provide an apparatus and method for reducing standby power of a switched mode power supply device to efficiently reduce standby power of the switched mode power supply device and to minimize the volume of the device.

In order to achieve the above object, the present invention converts a DC voltage obtained by rectifying and smoothing according to an input first or second control signal to a load demand voltage or a large voltage higher than the load demand voltage and then down to a predetermined level. A switching mode power supply for converting and outputting the converted power; Outputs the first control signal to the switching mode power supply in the operation mode, and outputs the second control signal in the standby mode to receive the voltage output from the switching mode power supply and operate in the operation mode and the standby mode accordingly. It is characterized by consisting of the system of the load.

In addition, the present invention for achieving the above object, the process of rectifying and smoothing a commercial AC power supply to generate a DC voltage; Determining a current mode according to whether a first control signal or a second control signal is generated; As a result of the determination, when the first control signal is generated, recognizing an operation mode and converting the DC voltage into a system-required voltage of a predetermined level and transmitting the system to a main and standby system; As a result of the determination, when the second control signal is generated, it is recognized as a standby mode, characterized in that the process of converting the DC voltage to the standby system required voltage of a predetermined level and transmitting to the standby system.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

It should be noted that in the following description, only parts necessary for understanding the operation and operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

In the following description, specific details regarding the standby power reduction of the switched mode power supply are shown to provide a more general understanding of the present invention. It will be apparent to one of ordinary skill in the art that the present invention may be readily practiced without these specific details and also by their modifications.

4 is a block diagram showing a standby power reduction device of the switching mode power supply according to an embodiment of the present invention.

Referring to FIG. 4, first, the switching mode power supply device 20 has the same internal structure as that of the conventional device, that is, the rectifying unit 11, the smoothing unit 13, and the DC voltage generator 21 of the transformer unit 15 of FIG. 1. ) And a charging / discharging unit 23 and a switching mode control unit 25. Thus, the switching mode power supply 20 rectifies and smoothes the input AC power, and then removes the ripple component of the smoothed voltage.

Thereafter, the DC voltage generator 21 outputs the voltage converted to a predetermined level different according to the operation mode and the standby mode to the charge / discharge unit 21.

First, in the operation mode, the switching mode controller (not shown) receives the first control signal from the standby system 33 and controls to convert the voltage converted to the predetermined level into a system required voltage. The voltage converted to the predetermined level is output to the system 40 through the switch unit 25 which is charged and discharged in the charge and discharge unit 23 and is switched on. At this time, the DC / DC converter 27 is disabled.

Secondly, in the standby mode, the switching mode controller receives the second control signal from the standby system 33 and controls to convert the voltage converted into the predetermined level into a voltage higher than the required voltage of the standby system 30. Thereafter, a voltage higher than the required voltage of the system 30 is down-converted to a standby system required voltage through the DC / DC converter 27 enabled by the second control signal, thereby providing a standby system ( 33). Here, in order to charge and discharge a voltage higher than the required voltage of the system 33, a capacitor having a high breakdown voltage should be used.

Such a capacitor is possible by the storage energy characteristics as shown in Equation 1 below.

Here, E represents the capacitor storage energy, C represents the capacitance of the capacitor, V represents the output voltage of the capacitor. That is, as shown by Equation 1, it can be seen that the energy stored in the capacitor C increases as the output voltage increases.

For example, if the voltage applied to the capacitor C is 4V, the energy stored in the capacitor C is 16V, and the capacitor C outputs 16V.

Thus, by providing the capacitor C having a large breakdown voltage in the charge / discharge unit 21, a voltage higher than the required voltage of the standby system 33 can be output, and the switching mode power supply 20 does not perform the switching operation. You can take a long break. Thus, the standby power of the switching mode power supply 20 is reduced and the efficiency is improved.

5 is a waveform diagram showing the output voltage waveform of the charging and discharging unit and the switching section of the switching mode power supply device, where section A represents an operation mode section and section B represents a standby mode section. First, in the section A, the charge / discharge unit 23 charges and discharges the system required voltage output through the switch unit 25 as shown in ⓔ. At this time, the switching mode controller controls the switching mode power supply 20 to intermittently switch.

Subsequently, in the section B, the switching mode controller receives the second control signal from the standby system 33 and changes the voltage to a voltage higher than the required voltage of the system 40 to output the charge / discharge unit 23. Then, the charging and discharging unit 23 is charged to a constant voltage up to a peak value of a voltage higher than the required voltage of the system 40, and discharge is started when the charging ends. At this time, the switching mode power supply is shut down when the charging and discharging unit 23 starts to discharge.

The output voltage waveform of the charging and discharging unit 23 has a waveform such as ⓕ. Thereafter, the switching mode control unit operates the switched mode power supply which is shut down when the discharge voltage of the charging and discharging unit 23 reaches the minimum required voltage of the system 23.

As a result, it can be seen that the? Waveform showing the intermittent switching operation of the switching mode power supply 20 has a longer rest period than the switching operation of the conventional switching mode power supply. In addition, it can be seen that the loss of the switching mode power supply 20 is also reduced compared to the conventional.

Thereafter, the voltage output through the charging and discharging unit 23 should be lowered to the required voltage of the system 30. Thus, a DC / DC converter 27 to be described later is used.

The DC / DC converter 27 receives the second control signal from the standby system 43 in the standby mode and down-converts the output to a predetermined level according to the required voltage of the standby system 43. Here, since the voltage input to the DC / DC converter 27 is higher than the required voltage of the system 30, the voltage is lowered to the voltage required by the system 30 and output.

As a result, the DC / DC converter 27 is turned off in the operation mode and turned on in the standby mode to convert the output voltage of the capacitor C described above to the standby system 33. do.

6 is a flowchart illustrating a method for reducing standby power of a switching mode power supply according to an exemplary embodiment of the present invention.

Referring to FIG. 6, first, a user operates a remote controller or a function key of the home appliance to operate a specific operation of the home appliance.

In step 611, the home appliance executes a specific operation according to the corresponding function key, and proceeds to step 613 to switch to the operation mode. Here, the operation mode is the section A of FIG. 5 described above.

In operation 615 to 619, the switching mode controller of the home appliance, which is switched to the operation mode, receives the first control signal from the standby system 33 and converts the rectified and smoothed DC voltage into a system level voltage of a predetermined level. do. The system required voltage is output to the main and standby systems 31 and 33 of the system 30 through the charge / discharge unit 23 and the switch unit 25 in the switched on state. At this time, the DC / DC converter 33 is disabled. Thus, the home appliance performs a specific operation.

In operation 621, it is determined whether the operation mode is terminated. When the operation mode ends, the operation proceeds to step 623 to switch to the standby mode.

However, if the operation mode is not terminated as a result of the determination, the process returns to step 617 and repeats the above process until the operation mode ends.

In operation 625 to 629, the switching mode controller receives the second control signal from the standby system 33 and controls the smoothed DC voltage to be converted into a voltage higher than the required voltage of the standby system 33. Here, the switch 25 is turned off by the second control signal, and the DC / DC converter 33 is enabled.

Then, the converted voltage is charged and discharged to a capacitor having a large breakdown voltage, and the output voltage of the capacitor is converted by the DC / DC converter 33 to a predetermined level down to a standby system required voltage and supplied to the standby system 33. .

That is, the waveform is supplied to the standby system 33 at the same voltage as in the operation mode as shown by the waveform ⓔ shown in FIG. Accordingly, the switching mode power supply 20 in the standby mode of the present invention can minimize the standby power as compared to the conventional.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described in detail above, in the standby mode of a home appliance, the present invention outputs a direct voltage higher than the voltage required by the load to the switching mode power supply device, and the output voltage is required by the load. By supplying the load to the load, it is possible to minimize the switching operation of the switching mode power supply in the standby mode, thereby bringing down the rest period, and to reduce the standby power and the power loss of the switching mode power supply.

In addition, there is an effect that can meet the standby power specification according to the regulation of the standby power by minimizing the standby power of the switching mode power supply in response to the standby power of the system.

In addition, it is possible to effectively reduce the standby power of the switching mode power supply, while minimizing the volume of the device, it is possible to reduce the cost when mass-producing the switching mode power supply.

Claims (10)

A switching mode power supply for converting a DC voltage obtained by rectifying and smoothing according to an input first or second control signal to a load request voltage or a large voltage higher than the load request voltage, and down-converting the output to a predetermined level; Outputs the first control signal to the switching mode power supply in the operation mode, and outputs the second control signal in the standby mode to receive the voltage output from the switching mode power supply and operate in the operation mode and the standby mode accordingly. Standby power reduction device of the switching mode power supply, characterized in that consisting of the system of the load. The apparatus of claim 1, wherein the switching mode power supply unit, The first control signal or the second control signal is input from the standby system of the system and outputs a control signal according to the operation mode and the standby mode to switch the smoothed DC voltage to a load request voltage or a voltage higher than the load request voltage. A switching mode controller; A charge / discharge unit configured to charge / discharge and filter a DC voltage which is changed by the switching mode controller; When the first control signal is input, the variable load request voltage is switched to be supplied to the system. When the second control signal is input, a voltage higher than the variable load request voltage is lowered to the load request voltage to the system. A switch unit for switching to be supplied; And a DC / DC converter configured to down-convert a voltage higher than the load request voltage to a load request voltage level when the second control signal is input. The apparatus of claim 2, wherein the charge / discharge unit is composed of a capacitor having a high breakdown voltage. The switching control signal of claim 1, wherein the first control signal controls the DC voltage obtained by smoothing in the operation mode to be converted into a load request voltage according to the operation mode, and is applied to the main system and the standby system of the system. Standby power reduction device of the switching mode power supply, characterized in that. The control method of claim 1, wherein the second control signal controls a voltage higher than the load request voltage to be converted into a load request voltage according to the standby mode in the standby mode, and applies the load request voltage only to the standby system of the system. Standby power reduction device of the switching mode power supply, characterized in that the switching control signal. The apparatus of claim 1, wherein the switching mode power supply unit, Switching mode for controlling the intermittent switching of the commercial AC power input to the peak voltage of a large voltage higher than the load demand voltage and shutting down to the minimum voltage of the load demand voltage after the second control signal is input. Standby power reduction device of the switching mode power supply characterized in that it comprises a control unit. The power supply of claim 1, wherein And a charging and discharging unit configured to charge, discharge, and filter a peak voltage of a large voltage higher than a load request voltage when the second control signal is input, wherein the standby power reduction device of the switching mode power supply device is configured. Rectifying and smoothing a commercial AC power supply to generate a DC voltage; Determining a current mode according to whether a first control signal or a second control signal is generated; As a result of the determination, when the first control signal is generated, recognizing an operation mode and converting the DC voltage into a system-required voltage of a predetermined level and transmitting the system to a main and standby system; As a result of the determination, when the second control signal is generated, the standby mode of the switching mode power supply device, characterized in that the standby mode and converting the DC voltage to a predetermined level of the standby system required voltage and transmits to the standby system. Power reduction method. The method of claim 8, wherein the transmitting of the system required voltages to the main and standby systems comprises: And converting the smoothed DC voltage into the required voltages of the main and standby systems, and outputting the converted system required voltages. The method of claim 8, wherein the transmitting of the standby system request voltage to the standby system comprises: Converting the smoothed DC voltage to a higher voltage than the required voltage of the main system or the standby system, and charging and discharging the converted high voltage to output the standby power of the switching mode power supply characterized in that it comprises Way.

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