KR20100090429A - Apparatus for supplying power - Google Patents

Abstract

PURPOSE: A power supply device is provided to reduce standby power consumption by rapidly discharging charges of a capacitor. CONSTITUTION: A main power supply unit(100) supplies AC input or DC input to one or more circuits includes at least one capacitor. An on/off circuit unit(110) includes a sensor, a transmitter, a first switching element, and a second switching element. The sensor senses the AC input. The transmitter transmits the sensed voltage by the sensor to the first switching element. The first switching device operates with the sensed voltage by the sensor. The second switching element is turned on or off according to the operation of the first switching element. A discharge resistor(120) is connected to an on and off circuit unit. The discharge resistor discharges the charge of the capacitor when the AC input is blocked.

Description

Power supply {Apparatus for supplying Power}

The present invention relates to a power supply.

In general, a liquid crystal display device includes two display plates with an electric field applying electrode and a liquid crystal layer having dielectric anisotropy disposed therebetween. A voltage is applied to the field applying electrode to generate an electric field in the liquid crystal layer, and the voltage is changed to adjust the intensity of the electric field to adjust the transmittance of light passing through the liquid crystal layer to display a desired image.

Since the liquid crystal display does not emit light by itself, a separate light source called a backlight is required, and the backlight includes a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), and an external electrode. Fluorescent lamps (EEFL) and the like are used.

The liquid crystal display has been actively researched to reduce power consumption. However, in the related art, when the liquid crystal display is in a standby state, power consumption in the standby state is not effectively reduced.

An embodiment of the present invention is to provide a power supply that can effectively reduce the power consumption of the standby state when the liquid crystal display is in the standby state.

The power supply apparatus according to an embodiment of the present invention supplies an AC input or a DC input to at least one circuit, detects an AC input main power supply including at least one capacitor, and detects an AC input. Or an on / off circuit portion that is turned on or off as on or off and connected to the on / off circuit portion, and a discharge resistor portion capable of discharging the charge charged in the capacitor while the AC input is interrupted.

The power supply apparatus according to another embodiment of the present invention supplies an AC input or a DC input to at least one circuit, a main power supply including at least one capacitor, detects an AC input, and supplies a sensed AC input. Connected to the on / off circuit and on / off circuit according to the operation of the AC input sensing unit to turn on or off, and can discharge the charge charged in the capacitor while the AC input is blocked. And a discharge resistor.

According to the embodiment, when the liquid crystal display is in the standby state, the power consumption of the standby state can be effectively reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Specific details of other embodiments are included in the detailed description and drawings. Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. Like reference numerals refer to like elements throughout.

1 is for explaining a power supply according to an embodiment of the present invention, Figure 2 is for explaining a power supply according to another embodiment of the present invention.

Referring to FIG. 1, a power supply apparatus according to an embodiment of the present invention may include a main power supply unit, an on / off circuit unit, and a discharge resistor unit.

The main power supply unit 100 supplies an AC input or a DC input to at least one circuit, and may include at least one capacitor (C). The main power supply unit 100 may apply an AC input or a DC input to a circuit capable of driving the display panel through at least one or more transformers LF102 and LF103. Here, at least one capacitor CX disposed in the main power supply unit 100 may include STBY input capacitors CX2 and 102 and X capacitors CX1 and 101.

The on / off circuit unit 110 detects an AC input and may perform an on or off operation as the sensed AC input is connected or disconnected. The on / off circuit unit 110 may include a detector 111, a transfer unit 112, a first switching element 113, and a second switching element 114.

The detector 111 may detect an AC input. That is, the AC input supplied through the main power supply unit 100 may be sensed. The detector 111 may include a zener diode element ZD1 and at least one resistor element R4, R5, and R6. That is, the sensing unit 111 may detect the AC input through at least one resistor element R4, R5, R6, and Zener diode element ZD1. Accordingly, the AC input can be detected efficiently, and the sense voltage can be transmitted without loss.

The transfer unit 112 may transfer the sense voltage supplied through the detector 111. The transfer unit 112 may include a diode device D1, at least one resistor device R7 and R8, and at least one capacitor C1 and C2. As such, the sensing voltage can be stably supplied to the first switching elements Q1 and 113.

The first switching elements Q1 and 113 may operate by receiving a sensing voltage transferred through the transfer unit 112. The first switching elements Q1 and 113 may include a bipolar junction transistor (BJT). That is, the first switching elements Q1 and 113 are supplied with the sensing voltage to the base terminal B of the first switching elements Q1 and 113 through the transfer unit 112 to be turned on or turned off. Turn off) operation.

The second switching elements Q2 and 114 may be turned on or turned off according to the operations of the first switching elements Q1 and 113. The second switching elements Q2 and 114 may include metal oxide semiconductor field effect transistors (MOS FETs). That is, as the first switching elements Q1 and 113 perform a turn on or turn off operation, the path of the STBY_Vcc voltage may vary. Accordingly, the second switching elements Q2 and 114 may turn on or turn off by the path of the different STBY_Vcc voltage.

The discharge resistor unit 120 may be connected to the on / off circuit unit 110 and discharge the charge charged in the capacitor CX while the AC input is blocked. The discharge resistor unit 120 may include at least one resistor element R1, R2, and R3. That is, as the second switching elements Q2 and 114 turn on or turn off, the discharge resistor unit 120 is electrically connected to or disconnected from the on / off circuit unit 110. Can be. Accordingly, the discharge resistor unit 120 may discharge the charge charged in the capacitor CX while electrically connected to the on / off circuit unit 110. Therefore, the discharge resistor 120 may discharge the charges charged in the STBY input capacitors CX2 and 102 and the charges charged in the X capacitors CX1 and 101.

Looking at the connection relationship of the power supply according to an embodiment of the present invention described so far as follows.

One end of the main power supply unit 100 and one end of the on / off circuit unit 110 are electrically connected in common. In this case, one end of the main power supply unit 100 is electrically connected to one end of the fourth resistor element R4, and the other end of the fourth resistor element R4 is electrically connected to one end of the fifth resistor element R5. The other end of the fifth resistor element R5 is electrically connected to one end of the sixth resistor element R6, and the other end of the sixth resistor element R6 is a cathode terminal and a diode of the zener diode element ZD1. It is electrically connected to the anode terminal of the device D1 in common. The cathode terminal of the diode device D1 is electrically connected to one end of the first capacitor C1 and one end of the seventh resistor element R7. The other end of the seventh resistor R7 is electrically connected to one end of the eighth resistor R8, one end of the second capacitor C2, and the base terminal B of the first switching elements Q1 and 113. .

The STBY_Vcc power supply terminal is electrically connected to the collector terminal C of the first switching elements Q1 and 113, one end of the third capacitor C3, and the gate terminal G of the second switching elements Q2 and 114. . The anode terminal A of the zener diode element ZD1 has the other end of the first capacitor C1, the other end of the eighth resistor element R8, the other end of the second capacitor C2, and the first switching elements Q1 and 113. Is electrically connected to the emitter terminal (E) of the (), the other end of the third capacitor (C3), and the source terminal (S) of the second switching elements (Q2, 114).

 In addition, the other end of the main power supply unit 100 is electrically connected to one end of the discharge resistor unit 120, and the other end of the discharge resistor unit 120 and the other end of the on / off circuit unit 110 are electrically connected in common. In this case, the other end of the main power supply unit 100 is electrically connected to one end of the first resistor element R1, and the other end of the first resistor element R1 is electrically connected to one end of the second resistor element R2. The other end of the second resistance element R2 is electrically connected to one end of the third resistance element R3, and the other end of the third resistance element R3 is the drain terminal D of the second switching elements Q2 and 114. Is electrically connected).

Thus, the operation of the power supply device according to an embodiment of the present invention connected and configured is as follows.

First, while the AC input is connected, the on / off circuit unit 110 may not operate and the discharge resistor unit 120 may be in an open state with the on / off circuit unit 110. That is, when the AC input is detected by the fourth resistor element R4 to the sixth resistor element R6 and the zener diode element ZD1 of the on / off circuit unit 110, the sensed sensed voltage is detected by the diode element D1. The first capacitor C1, the seventh resistor R7, the eighth resistor R8, and the second capacitor C2 are supplied to the first switching elements Q1 and 113 after passing through the first capacitor C1, the seventh resistor R7, the eighth resistor R8, and the second capacitor C2. Accordingly, the first switching elements Q1 and 113 may turn on.

When the first switching elements Q1 and 113 are turned on, the voltage supplied through the STBY_Vcc power terminal is connected to the collector terminal C and the emitter terminal E of the first switching elements Q1 and 113. A passing voltage path can be formed. Accordingly, the second switching elements Q2 and 114 may turn off. Therefore, the discharge resistor unit 120 does not operate.

In addition, while the AC input is blocked, the on / off circuit unit 110 operates and the discharge resistor unit 120 is connected to the on / off circuit unit 110 to charge and X capacitors charged in the STBY input capacitors CX2 and 102. The charge charged in (CX1, 101) can be discharged. That is, when the AC input is not sensed by the fourth resistor element R4 to the sixth resistor element R6 and the zener diode element ZD1 of the on / off circuit unit 110, the sensing voltage is cut off and thus the first switching element. It is not supplied to (Q1, 113). Accordingly, the first switching elements Q1 and 113 may turn off.

When the first switching elements Q1 and 113 are turned off, the voltage path flowing through the first switching elements Q1 and 113 is cut off to supply the voltage supplied through the STBY_Vcc power terminal to the second switching element ( It is supplied to the gate terminal G of Q2,114. Accordingly, the second switching elements Q2 and 114 may turn on. Thus, the discharge resistor 120 may operate. That is, the discharge resistor unit 120 may discharge the charges charged in the STBY input capacitors CX2 and 102 and the charges charged in the X capacitors CX1 and 101 through the second switching elements Q2 and 114.

As described above, when the AC input is connected to the on / off circuit unit 110, it may be turned off. Accordingly, when the AC input is connected, the first switching elements Q1 and 113 may be turned on, and may be turned off when the AC input is cut off. In addition, when the first switching elements Q1 and 113 are turned on, the second switching elements Q2 and 114 are turned off, and the first switching elements Q1 and 113 are turned off. (Turn off), the second switching elements Q2 and 114 are turned on, so that the discharge resistor unit 120 operates when the second switching elements Q2 and 114 are turned off. Instead, when turned on, the charges charged in the STBY input capacitors CX2 and 102 and the charges charged in the X capacitors CX1 and 101 may be discharged.

In addition, by disposing the discharge resistor unit 120 near the STBY input capacitors CX2 and 102, the charges charged in the STBY input capacitors CX2 and 102 can be efficiently discharged. Accordingly, it is possible to reduce the discharge time to satisfy the standby power.

Referring to FIG. 2, a power supply device according to another embodiment of the present invention may include a main power supply unit, an AC input sensing unit, an on / off circuit unit, and a discharge resistor unit.

The main power supply unit 200 supplies an AC input or a DC input to at least one circuit, and may include at least one capacitor CY1, CY2, CX3. The main power supply unit 200 may provide an AC input or a DC input to a circuit capable of driving the display panel through at least one transformer LF102 or LF103. Here, at least one capacitor CY1, CY2, and CX3 disposed in the main power supply 200 may include X capacitors CX3 and 201.

The AC input detector 210 may detect an AC input and supply or cut off the sensed AC input. The AC input detector 210 may include an AC detector 211, a voltage transmitter 212, and a shunt regulator U1 and 213.

The AC detector 211 may detect an AC input. That is, the AC input supplied through the main power supply unit 200 may be sensed. The AC detector 211 includes an AC resistor element R10, an AC capacitor C3, and an AC diode element D2, and detects an AC input through the AC resistor element R10 and the AC capacitor C3. have. Accordingly, the AC input can be detected efficiently.

The voltage transmitter 212 may transfer the sensed voltage supplied through the AC detector 211. The voltage transfer unit 212 may include a diode device D3, at least one resistor device R11, R12, and R13, and at least one capacitor C4 and C5. As such, the sensing voltage can be stably supplied to the shunt regulators U1 and 213.

The shunt regulator U1 and 213 may operate by receiving a sensed voltage transferred through the voltage transfer unit 212.

The on / off circuit unit 220 may perform an on or off operation according to the operation of the AC input detector 210. The on / off circuit unit 220 may include at least one switching element (Q3, Q4, Q5), at least one resistance element (R14, R15, R16) and at least one diode element (D4, D5). have. In this case, the switching elements Q3, Q4, and Q5 may be easily configured to include a bipolar junction transistor (BJT) or a MOS transistor (Metal Oxide Semiconductor Field Effect Transistor, MOS FET).

The discharge resistor unit 230 may be connected to the on / off circuit unit 220 and discharge the electric charges charged in the capacitors CY1, CY2, and CX3 while the AC input is blocked. The discharge resistor 230 may include at least one resistor R16, R17, R18, and R19. That is, as the switching elements Q3, Q4, and Q5 turn on or turn off, the discharge resistor 230 is electrically connected to or disconnected from the on / off circuit 220. Can be. Accordingly, the discharge resistor 230 may discharge the charges charged in the capacitors CY1, CY2, and CX3 while electrically connected to the on / off circuit unit 220. Therefore, the discharge resistor 230 may discharge the charges charged in the X capacitors CX3 and 201.

Looking at the connection relationship of the power supply according to another embodiment of the present invention described so far as follows.

The main power supply 200 is electrically connected to the AC input detector 210 and the discharge resistor 230 in common. In this case, the main power supply unit 200 is electrically connected to one end of the AC capacitor C3 and one end of the sixteenth resistor R16. The other end of the AC capacitor C3 is electrically connected to the cathode terminal K of the AC diode element D2, one end of the AC resistor terminal R10, and the anode terminal A of the third diode element D3. The cathode terminal K of the third diode element D3 is electrically connected to one end of the eleventh resistance element R11 in common. The other end R11 of the eleventh resistor element is electrically connected to one end of the fourth capacitor C4 and one end of the twelfth resistor element R12. The other end of the twelfth resistor element R12 is electrically connected to one end of the fifth capacitor C5, one end of the thirteenth resistor element R13, and the reference terminal R of the shunt regulators U1 and 213.

 The anode terminal A of the AC diode element D2 has the other end of the AC resistance terminal R10, the collector terminal C of the third switching element Q3, the other end of the fourth capacitor C4, and the fifth capacitor C5. And the other end of the 13th resistor element R13 and the cathode terminal K of the shunt regulators U1 and 213 are electrically connected in common.

 The STVCC power supply terminal is electrically connected to the collector terminal C of the fourth switching element Q4 and one end of the fourteenth resistance element R14. The emitter terminal E of the fourth switching element Q4 is electrically connected to one end of the fifteenth resistor element R15 and the anode terminal A of the fifth diode element D5. The base terminal B of the fourth switching element Q4 has the other end of the fourteenth resistance element R14, the other end of the fifteenth resistance element R15, one end of the sixteenth resistance element R16 and the third switching element. Is electrically connected to the terminal. The base terminal B of the third switching element Q3 is electrically connected to the other end of the sixteenth resistor element R16 and the anode terminal A of the fourth diode element D4. The cathode terminal K of the fourth diode element D4 is electrically connected to the cathode terminal K of the shunt regulators U1 and 213.

 The cathode terminal K of the fifth diode element D5 is electrically connected to the base terminal B of the fifth switching element Q5, and the emitter terminal E of the fifth switching element Q5 is a reference voltage source. Is electrically connected to (GND).

The other end of the sixteenth resistor element R16 is electrically connected to one end of the seventeenth resistor element R17, and the other end of the seventeenth resistor element R17 is electrically connected to one end of the eighteenth resistor element R18. The other end of the eighteenth resistor element R18 is electrically connected to one end of the nineteenth resistor element R19, and the other end of the nineteenth resistor element R19 is electrically connected to the collector terminal C of the fifth switching element Q5. Is connected.

As described above, the operation of the power supply device according to another embodiment of the present invention connected and configured is as follows.

First, while the AC input is connected, the on / off circuit unit 220 may not operate and the discharge resistor unit 230 may be in an open state with the on / off circuit unit 220. That is, when the AC input is applied, when the AC input is sensed through the AC capacitor C3 and the AC resistor R10 of the AC input detector 210, the sensed voltage is detected by the third diode element D3 and the eleventh resistor element. After passing through the R11, the fourth capacitor C4, the twelfth resistor R12, the fifth capacitor C5, and the thirteenth resistor R13, the second capacitor C4 is supplied to the shunt regulators U1 and 213. As a result, the shunt regulators U1 and 213 may turn on.

When the shunt regulators U1 and 213 are turned on, the voltage supplied through the STVCC power terminal is not supplied to the base terminal B of the third switching element Q3 and thus the third switching element Q3. Is turned off and the on / off circuit unit 220 does not operate. That is, as the third switching element Q3 is turned off, the fourth switching element Q4 and the fifth switching element Q5 are turned off.

In addition, while the AC input is blocked, the on / off circuit unit 220 operates and the discharge resistor unit 230 is connected to the on / off circuit unit 220 to discharge the charges charged in the X capacitors CX3 and 201. have. That is, when the AC input is cut off, the AC input is not sensed through the AC capacitor C3 and the AC resistor R10 of the AC input detector 210. As a result, the sensing voltage is cut off so that it is not supplied to the shunt regulators U1 and 213. Accordingly, the shunt regulators U1 and 213 may turn off.

When the shunt regulators U1 and 213 are turned off, the voltage supplied through the STVCC power supply terminal is supplied to the base terminal B of the third switching element Q3, thereby providing a third switching element Q3. Turned on. As the third switching device Q3 is turned on, the voltage of the fourth switching device Q4 is turned on to be supplied through the STVCC power supply terminal, so that the base of the fifth switching device Q5 is turned on. It may be supplied to the terminal B. Accordingly, the fifth switching element Q5 may turn on. Thus, the discharge resistor 230 may operate. That is, the discharge resistor 230 may discharge the charges charged in the X capacitors CX3 and 201 through the fifth switching element Q3.

As described above, when the AC input is connected to the AC input detecting unit 210, the on / off circuit unit 220 is turned off, and when the AC input is cut off, the on / off circuit unit 220 is turned on. (Turn on) In addition, the shunt regulators U1 and 213 may turn on when the AC input is connected, and turn off when the AC input is blocked. Accordingly, when the shunt regulators U1 and 213 are turned on, the switching elements Q3, Q4 and Q5 are turned off, and the shunt regulators U1 and 213 are turned off. When the switching elements Q3, Q4 and Q5 are turned on, the discharge resistor 230 does not operate when the switching elements Q3, Q4 and Q5 are turned off. When turned on, the charges charged in the X capacitors CX3 and 201 may be discharged.

As such, as configured, the charges charged in the X capacitors CX3 and 201 can be efficiently discharged. Accordingly, it is possible to reduce the discharge time to satisfy the standby power.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Rather, it will be apparent to those skilled in the art that many changes and modifications to the present invention are possible without departing from the spirit and scope of the appended claims.

Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

1 illustrates a power supply apparatus according to an embodiment of the present invention.

2 is for explaining a power supply apparatus according to another embodiment of the present invention.

<Description of Signs of Major Parts of Drawings>

100: main power supply unit 110: on / off circuit unit

111: detection unit 112: transfer unit

113: first switching element 114: second switching element

120: discharge resistor 200: main power supply

210: AC input detector 211: AC detector

212: voltage transfer section 213: shunt regulator

220: on / off circuit portion 230: discharge resistance portion

Claims (26)

A main power supply for supplying an AC input or a DC input to at least one circuit and including at least one capacitor; An on / off circuit unit which senses the AC input and performs an on or off operation as the detected AC input is connected or disconnected; And A discharge resistor unit connected to the on / off circuit unit and capable of discharging a charge charged in the capacitor while the AC input is blocked; Power supply comprising a. According to claim 1, The on / off circuit section A detector configured to detect the AC input; A transfer unit transferring a sense voltage supplied through the detector; A first switching element operated by receiving the sensing voltage transmitted through the transfer unit; And And a second switching element that is turned on or off in accordance with the operation of the first switching element. According to claim 1, The discharge resistor unit comprises at least one resistor element. The method according to claim 2 or 3, And the discharge resistor unit is electrically connected to the second switching element. The method of claim 2, The first switching device includes a bipolar junction transistor (BJT). The method of claim 2, The second switching device includes a MOS transistor (Metal Oxide Semiconductor Field Effect Transistor, MOS FET). The method of claim 2, The sensing unit includes a Zener diode element. The method of claim 2, The power supply unit includes a diode element. The method according to claim 7 or 8, And a cathode terminal of the zener diode element and an anode terminal of the diode element. According to claim 1, The main power supply unit includes a STBY input capacitor and an X capacitor, And the discharge resistor unit discharges the charge charged in the STBY input capacitor and the charge charged in the X capacitor. According to claim 1, And the on / off circuit unit is turned off when the AC input is connected and turned on when the AC input is cut off. The method of claim 2, The first switching element is turned on when the AC input is connected, and is turned off when the AC input is cut off. The method of claim 12, And when the first switching element is turned on, the second switching element is turned off, and when the first switching element is turned off, the second switching element is turned on. A main power supply for supplying an AC input or a DC input to at least one circuit and including at least one capacitor; An AC input detector configured to sense the AC input and supply or cut off the sensed AC input; An on / off circuit unit configured to perform an on or off operation according to the operation of the AC input sensing unit; And A discharge resistor unit connected to the on / off circuit unit and capable of discharging a charge charged in the capacitor while the AC input is blocked; Power supply comprising a. 15. The method of claim 14, The AC input detecting unit An AC detecting unit detecting the AC input; A voltage transfer unit transferring a sense voltage supplied through the AC detector; And And a shunt regulator configured to receive and operate the sensed voltage transmitted through the voltage transfer unit. 15. The method of claim 14, The on / off circuit portion includes at least one switching element, at least one resistor element and at least one diode element. The method according to claim 15 or 16, At least one switching element is electrically connected to the shunt regulator. The method of claim 16, The switching device includes a bipolar X-ray transistor (Bipolar Junction Transistor, BJT). The method of claim 16, The switching device includes a MOS transistor (Metal Oxide Semiconductor Field Effect Transistor, MOS FET). The method of claim 15, The AC sensing unit includes an AC resistive element and an AC capacitor, And a power supply for sensing an AC input through the AC resistance element and the AC capacitor. 15. The method of claim 14, The discharge resistor unit comprises at least one resistor element. The method according to claim 14 or 16, And the discharge resistor unit is electrically connected to the switching element. 15. The method of claim 14, The main power supply includes an X capacitor, And the discharge resistor unit discharges the charge charged in the X capacitor. 15. The method of claim 14, And the on / off circuit unit is turned off when the AC input is connected to the AC input sensing unit, and the on / off circuit unit is turned on when the AC input is cut off. The method of claim 15, And the shunt regulator turns on when the AC input is connected and turns off when the AC input is cut off. The method of claim 25, The switching element is turned off when the shunt regulator is turned on, and the switching element is turned on when the shunt regulator is turned off.

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