KR100987435B1 - Power Saving Circuit of The Monitor - Google Patents

Abstract

The present invention relates to a power saving circuit of a monitor that can reduce the cost and improve the design convenience through a more effective power saving circuit configuration, and includes a rectifying unit (BD11) for full-wave rectifying the input AC power (AC power), the rectifier ( BD11) a power transformer for discharging the power rectified by the internal winding ratio to the secondary side, the first and second rectifying / smoothing unit for rectifying and smoothing the power of the secondary side of the power transformer, the first rectifying / A first power saving mode driver for controlling the output of the first DC power source Vcc1 rectified and smoothed by the smoothing unit according to the power saving mode signal DPM1, and a second DC power source rectified and smoothed by the second rectifying / smoothing unit ( Since a second power saving mode driver is configured to control the output of Vcc2 according to the driving of the first power saving mode driver, the power saving operation of the remaining power saving mode driver is automatically performed according to the operation of one power saving mode driver. By constructing a more simplified power saving circuit, it is possible to achieve cost savings and design convenience.

Power saving circuit

Description

Power Saving Circuit of The Monitor

1 is a view showing a power saving circuit of a monitor according to the prior art

2 is a view showing a power saving circuit of a monitor according to the present invention;

DESCRIPTION OF THE REFERENCE NUMERALS

10: transformer 20: power control unit

30: first rectifying and smoothing part 40: second rectifying and smoothing part

50: first power saving mode driver 60: second power saving mode driver

Q11, Q12, Q13: first, second, third transistor

The present invention relates to a power supply circuit of the monitor, and more particularly, to a power saving circuit of the monitor to improve the cost reduction and design convenience through a more effective power saving circuit configuration.

Generally, in order to reduce unnecessary power consumption of the monitor, if the user does not use the PC for a certain period of time, the power transmission is controlled by controlling the display power management (DPM) mode, which is a power save mode, in the system microcomputer of the monitor. Down outputs the secondary output voltage.

As such, the requirements for reducing power consumption are increasing, and at the same time, the requirements for reducing power consumption of the IC itself are increasing not only in terms of cost reduction but also as one-chip changes.

As shown in FIG. 1, a power saving circuit of a monitor according to the related art includes a bridge diode BD1 for rectifying an input AC power and an rectified power supply to a monitor secondary side according to an internal winding ratio. A power transformer 1 for switching and outputting the power supply, a power control unit 2 for controlling switching of the power transformer 1, and first and second rectifying and smoothing secondary powers of the power transformer 1; Power saving mode signals (DPM1, DPM2) of the microcomputer (not shown) for the DC power rectified and smoothed through the rectifying and smoothing parts 3 and 4 and the first and second rectifying and smoothing parts 3 and 4, respectively. The first and second power saving mode driving units 5 and 6 control the load supply power sources Vcc1 and Vcc2 according to the present invention.

In this case, the first power saving mode driver 5 controls the supply of the output DC power Vcc1 of the first rectifying and smoothing unit 3 by turning on / off by the power saving mode signal DPM1. And second transistors Q1 and Q2, and the second power saving mode driver 6 is similarly turned on / off by the power saving mode signal DPM2 to output the DC power of the second rectifying and smoothing part 4. It consists of the 3rd and 4th transistors Q3 and Q4 which control supply of (Vcc2).

In the conventional monitor power saving circuit configured as described above, first, an input AC power source (AC power source) is full-wave rectified by the bridge diode BD1, and the rectified power source is supplied to the primary side N1 of the power transformer 1. .

At this time, the power control unit 2 receives and drives the rectified power from the bridge diode BD1 through the diode D1 and the capacitor C1 to control the primary side N1 switching of the power transformer 1. Done.

In addition, the power transformer 1 switches according to the switching control of the power control unit 2 and induces the power required for the load to the secondary side N2 according to the internal turns ratio, which is the first and second power supplies. After rectification and smoothing are performed by the diodes D2 and D3 and the capacitors C2 and C3 of the rectifying and smoothing parts 3 and 4, respectively, and are supplied to the voltages Vcc1 and Vcc2 necessary for each load.

At this time, the microcomputer outputs power saving mode signals DPM1 and DPM2 in a high state to operate the first and second power saving mode driving units 5 and 6 normally so that the first and second rectifying and smoothing units 3 can be operated. , 4) to supply the rectified and smoothed voltages Vcc1 and Vcc2 to the corresponding loads, respectively.

That is, the first and second power saving mode driving units 5 and 6 operate the internal transistors Q1 and Q2 Q3 and Q4 by being turned on by the power saving mode DPM1 and DPM2 high signals. And the output voltages Vcc1 and Vcc2 of the smoothing parts 3 and 4 are supplied to the corresponding loads so that the monitor screen is normally displayed.

On the other hand, when the PC enters the power saving mode, the microcomputer outputs the low power saving mode signals DPM1 and DPM2 and the first and second power saving mode drivers 5, according to the low power saving modes DPM1 and DPM2. The internal transistors (Q1, Q2) (Q3, Q4) of 6) are turned off, and the voltage (Vcc1, Vcc2) supplied to each load is cut off, thus entering the power saving mode.

Therefore, in the power saving mode DPM, power is supplied to each load of the monitor according to the power saving mode signals DPM1 and DPM2 of the microcomputer, thereby reducing power.

However, since the power saving circuit of the monitor according to the prior art performs a separate power saving operation by receiving a plurality of power saving mode drivers respectively, the power saving mode driving unit requires a relatively large number of components to configure the power saving mode driving unit. Therefore, in constructing a power saving circuit, the cost rises and takes up a large part of a printed circuit board (PCB), which has a problem in that the price competitiveness is weakened in contrast to a trend for increasing cost reduction.

Accordingly, an object of the present invention is to provide a power saving circuit for a monitor that can reduce cost and improve design convenience through a more effective circuit configuration.

The power saving circuit of the monitor according to the present invention for achieving the above object is a rectifying unit (BD11) for full-wave rectifying the input AC power (AC power), by inducing the power rectified in the rectifying unit (BD11) in accordance with the turn ratio of the inside A power transformer for supplying to the secondary side, first and second rectifying / smoothing portions for rectifying and smoothing the secondary side power supply of the power transformer, and a first DC power supply rectified and smoothed at the first rectifying / smoothing portion (Vcc1) The first power saving mode driver for controlling the output of the control unit according to the power saving mode signal DPM1, and the output of the second DC power supply Vcc2 rectified and smoothed by the second rectifying / smoothing unit to drive the first power saving mode driver. It is configured to include a second power saving mode driver for controlling according to the feature.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

A preferred embodiment of the power saving circuit of the monitor according to the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 2, the power saving circuit of the monitor according to the present invention includes a bridge diode BD11 for full-wave rectifying an input AC power source, and the power rectified by the bridge diode BD11 according to an internal winding ratio. A power transformer 10 for inducing and supplying to the secondary side, a power control unit 20 for controlling switching of the power transformer 10, and first and second rectifying and smoothing secondary powers of the power transformer 10. A first power saving mode for controlling the output of the first rectified and smoothed parts 30 and 40 and the first DC power source Vcc1 rectified and smoothed by the first rectified and smoothed part 30 according to the power saving mode signal DPM1. The second power saving mode driver controlling the output of the second DC power source Vcc2 rectified and smoothed by the driving unit 50 and the second rectifying / smoothing unit 40 according to the driving of the first power saving mode driver 50. It consists of 60.

Here, the first and second rectification / smoothing unit (30, 40) is rectified through the diodes (D12, D13) and the diodes (D12, D13) for rectifying the power supplied through the power transformer 10 Condensers C12 and C13 for smoothing the power supply, respectively.

The first power saving mode driver 50 may include a second transistor Q12 that is turned on / off according to a power saving mode signal DPM1 input from a system microcomputer (not shown) through a base, A base is connected to the collector of the second transistor Q12 and an emitter is connected to the output terminal of the first rectifying / smoothing unit 30, thereby turning on / off the second transistor Q12. The first transistor Q11 is turned on / off.

In addition, the second power saving mode driver 60 has an emitter connected to the output terminal of the second rectifying / smoothing unit 40 and a base connected to the collector of the first transistor Q11. The third transistor Q13 is turned on or off in accordance with the on / off of Q11).

Referring to the operation of the power saving circuit of the monitor according to the present invention configured as described above in detail as follows.

First, the input AC power (AC power) is full-wave rectified through the bridge diode BD11 and the rectified power is supplied to the primary side N1 of the power transformer 10.

At this time, the power control unit 20 drives according to the input of the rectified power from the bridge diode BD11 to control the primary side N1 switching of the power transformer 10.

The power transformer 10 is induced with the primary side N1 power to the secondary side N2 according to the internal turns ratio based on the switching operation of the power control unit 20.

The organic power output from the power transformer 10 is rectified and smoothed by the diodes D12 and D13 and the capacitors C12 and C13 of the first and second rectification / smoothing units 30 and 40, respectively, and then various loads. The power supplies are supplied to the DC power supplies Vcc1 and Vcc2 (not shown).                     

At this time, when the user is using the PC, the system microcomputer (not shown) outputs the high level power saving mode signal DPM1, and when the PC is not used for a predetermined time, the low level power saving mode signal DPM1 is output. Outputs

Herein, operations of the first and second power saving mode drivers 50 and 60 according to the power saving mode signal output from the system microcomputer will be described.

When the power saving mode signal DPM1 is high, the second transistor Q12 of the first power saving mode driving unit 50 is turned on, and then the first transistor Q11 is turned on so that the first rectifying / smoothing unit 30 is turned on. The first DC power supply (Vcc1) output from is supplied to the corresponding load.

As the first transistor Q11 is turned on, the second transistor Q13 of the second power saving mode driver 60 is turned on and output from the second rectifying / smoothing unit 40. This will be supplied to the corresponding load.

On the other hand, when the power saving mode signal DPM1 is low, the second transistor Q12 is turned off, and then the first transistor Q11 is turned off, and the third transistor Q13 connected thereto is turned on when the first transistor Q11 is turned off. ) Is also off. In other words, the first, second, and third transistors Q11, Q12, and Q13 are all turned off according to the low-level power saving mode signal DPM1 to cut off the DC power supplies Vcc1 and Vcc2 supplied to each load. The power save mode is activated.

Therefore, according to the present invention, when the first power saving mode driver 50 is in the power saving state, the second power saving mode driver 60 automatically enters the power saving state even if there is no input of the power saving mode signal.

That is, when the power saving mode driver outputs the power saving mode signal to any one of the plurality of power saving mode drivers, the power saving mode driving unit receives the power saving mode signal. Power saving operation of the drive unit is made automatically.

As described above, in the power saving circuit of the monitor according to the present invention, the power saving operation of the power saving mode driving unit is automatically performed according to the operation of one power saving mode driving unit in the power saving mode driving unit that performs the power saving operation of the monitor. There is an advantage that the configuration of the circuit is simplified.

Therefore, the present invention can obtain effects such as cost reduction as well as design convenience by minimizing circuit components.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (3)

Rectifier (BD11) for full-wave rectifying input AC power (AC power), A power transformer for supplying the power rectified by the rectifying unit BD11 to the secondary side according to the winding ratio therein; First and second rectifying / smoothing portions for rectifying and smoothing the secondary side power source of the power transformer; A first power saving mode driving unit controlling the output of the first DC power supply Vcc1 rectified and smoothed by the first rectifying / smoothing unit according to the power saving mode signal DPM1; And a second power saving mode driver configured to control an output of the second DC power source Vcc2 rectified and smoothed by the second rectifying / smoothing part according to the driving of the first power saving mode driver. The first power saving mode driver, A second transistor Q12 turned on / off according to the power saving mode signal DPM1 input through the base; A first transistor having a base connected to the collector of the second transistor Q12 and an emitter connected to an output terminal of the first rectifying / smoothing unit, and being turned on / off according to the on / off of the second transistor Q12; Q11), The second power saving mode driver, A third transistor connected to an emitter at an output terminal of the second rectifying / smoothing unit, a base connected to a collector of the first transistor Q11, and turned on / off according to on / off of the first transistor Q11 ( Q13), the power saving circuit of the monitor characterized by. delete delete

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