KR0121738B1 - Ultra power saving circuit - Google Patents

Abstract

It provides an ultra power-save circuit. In power-saving mode, the circuit makes the monitor and the peripheral thereof operate as a green-mode by reducing the total power dissipation less than 1 watt.In the power-saving mode, the synchronous signal(S) is no more available and the capacitor(C1) charge of the power-saving mode sensing part(11) is discharged through the resister(R3). The the SCR control part(12) transistor(Q1) is turned on by applying low voltage at the base thereof. The transformer(T2) voltage(VT2) maintains zero, so that the SCR(SCR1) gate cannot be triggered even though the Vs is higher than the Vin and is turned off. Therefore, in off-mode, the power supplied through the bridge diode(BD) cannot be supplied to the transformer(T) for the SCR(SCR1) is on off-mode. The multiple output blocks(7) are not supplied with operating voltage at all.

Description

Ultra Low Power Circuit

1 is a conventional power saving circuit diagram.

2 is an ultra-low power circuit diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

10: power cut off means 11: power saving mode detection unit

12: SCR driving control unit 13: SCR driving unit

The present invention relates to an ultra-power saving circuit, and more particularly, a computer display device such as a monitor or a printer does not have a key input for a predetermined time while the power is turned on. The present invention relates to an ultra-power saving circuit having a power cut-off means for cutting off the power supply, so that only a very small power of less than 1W is consumed in the power saving mode, thereby obtaining a greater power saving effect.

In general, if the user does not use the keyboard for a certain period of time with the green function installed on the monitor, the monitor automatically switches from the on mode, the standby mode to the suspend mode, or the suspend mode, or the off mode. To prevent it.

Normally, the horizontal synchronization signal and the vertical synchronization signal are normally applied to the microcomputer in the use mode of the monitor. In the standby mode, the horizontal synchronization signal is not applied to the microcomputer but only the vertical synchronization signal is applied to the microcomputer. On the contrary, the horizontal synchronization signal is not applied to the microcomputer but only the vertical synchronization signal. In the standby mode or the suspend mode, about 15W of power is consumed.

In the off mode, the horizontal synchronization signal or the vertical synchronization signal is not applied to the microcomputer, and a power source capable of operating only the microcomputer is applied. At this time, the total power consumption is about 5W.

Meanwhile, as described above, the power saving mode is applied to the monitor to prevent unnecessary consumption of power when the monitor is not used. However, a printer, which is a computer display device used with the monitor, is used. Even when not, the printer itself consumes about 25W of power.

Here, the conventional power saving circuit for the monitor is composed of a bridge diode (BD) and a condenser (C) as shown in FIG. 1, the electrostatic source supply unit (1) for rectifying and smoothing the input AC power, Transistor Q10 which is switched by the voltage applied from transformer 1 to the transformer T and the PWM signal of the control IC 2, the secondary diode D11 of the transformer T1, and the capacitor C11. A first power supply unit 3 for rectifying the voltage excited by the first coil S11 on the secondary side of the transformer T ₁ to output the voltage B + to the monitor, and a diode D12 on the secondary side of the transformer T1. And a second power supply unit 4 configured to condense the voltage excited by the second coil S12 to the image signal processing unit, and the second power supply unit 3 and the second power supply unit 4. Switching consisting of transistors Q11 (Q12) and resistors R11 (R12), which are connected to an output terminal of and switched according to the control signal of the microcomputer 5; 6 and, connected to the switching unit 6 to recognize as to whether the horizontal synchronization signal and vertical synchronization signal comprises a microcomputer (5) for outputting a control signal to the switching unit (6).

Meanwhile, the operation of the conventional monitor power saving circuit having the above configuration will be described below.

First, in the use mode of the monitor, since the horizontal synchronizing signal and the vertical synchronizing signal are applied to the microcomputer 5 and the low potential signal is output from the microcomputer 5, the transistor Q12 of the switching unit 6 is turned off. The transistor Q11 is also turned off in accordance with the off state of the transistor Q12.

Therefore, in the mode of use of the monitor, the output voltages of the first power supply unit 3 and the second power supply unit 4 are not limited, and the monitor operates normally by applying to the monitor, an image signal processor (not shown), and a vertical / horizontal deflection unit and an oscillator. As a result, the input video signal is processed to be displayed on the screen. If the user enters the power saving mode while not using the monitor for a predetermined time while the power is turned on, the vertical synchronizing signal and the horizontal synchronizing signal are not applied to the microcomputer 5. Therefore, the high potential is output from the microcomputer 5, the transistor Q12 of the switching section 6 is turned on, and the transistor Q11 is also turned on.

Therefore, in the power saving mode, the output voltages Vo1 and Vo2 of the first power source 3 and the second power source 4 are reduced to about 1/10 of the normal state by the control signal of the microcomputer 5, and thus B + is reduced. The power is applied to the input terminal of the IC IC1 to operate the microcomputer 5. That is, other parts except the microcomputer 5 do not operate, so that power consumption is reduced to less than 5W.

However, in the power saving circuit of the conventional monitor as described above, a power supply capable of operating the microcomputer 5 for determining the operation mode in the power saving mode (in the off mode) is required, and for the microcomputer 5 to operate. Since the control IC 2 on the primary side of the transformer T1 needs to operate, power consumption is required, and thus, more power is required than power consumed by the microcomputer 5.

That is, even if less than 1W of power is required in the microcomputer 5 in the off mode, the power required to operate the control IC 2 of the transformer T1 primary is summed up to about 5W in the off mode. There was a problem to consume power.

Therefore, the present invention has been invented to solve such a problem, and the power consumption in the power saving mode is reduced to the maximum, so that the total power consumption is less than 1W in the power saving mode so that the monitor and its peripheral devices can perform the green function. The purpose is to provide an ultra-power saving circuit.

In order to achieve the above object, the present invention provides a power saving mode detection unit for detecting whether a synchronization signal detected from a computer main body is applied, an SCR driving control unit switched according to an output of the power saving mode detection unit, and a control of the SCR driving control unit. On / off according to the signal is characterized in that consisting of the SCR driver for cutting off or passing the power.

Hereinafter, with reference to the accompanying drawings an embodiment of the ultra-low power circuit of the present invention will be described in detail.

2 is a bridge diode (BD) for rectifying AC power input to the circuit diagram of the present invention, a capacitor (C) for smoothing the power rectified by the bridge diode (BD), and the output voltage of the capacitor (C) Of the transformer T10 for boosting the voltage to a constant level, the transistor Q10 connected to one end of the primary side of the transformer T1 and switched by a PWM signal output from the control IC 2, and the transformer T1. A circuit comprising a power supply unit 7 made of a diode Do and a capacitor Co for rectifying and smoothing the secondary output voltage. The power saving mode is performed between the bridge diode BD and the capacitor C. Recognizing that the vertical synchronizing signal and the horizontal synchronizing signal is not applied to the power supply block means for completely shutting off the output power from the bridge diode (BD).

In addition, the power cut-off means 10 is composed of a diode (D1), a resistor (R3), a capacitor (C1) power saving mode detection unit 11 for detecting whether the synchronization signal (S) is applied, and the transistor (Q1) And the SCR driving controller 12 configured to be operated according to the output level of the power saving mode detecting unit 11, the SCR (SCR1), and the resistor R1 (R2). It is configured to include an SCR driver 13 that is turned on / off according to the output of the control unit 12 to cut off or pass the power.

According to the present invention configured as described above, when the monitor operates normally and the synchronization signal S is input to the power saving mode detection unit 11 of the power cut-off means 10, the synchronization signal S is rectified through the diode D1. After the capacitor C1 is charged, the transformer T2 does not operate as the transistor Q1 to which the high potential is applied to the transistor Q1 base of the SCR driving controller 12 is turned off. In this state, the bridge diode If the voltage rectified through BD (which is referred to as Vs) is higher than the voltage of the smoothing capacitor C (which is referred to as Vin), the resistance of the SCR (SCR1) is controlled through the resistors R1 and R2 of the SCR driver 13. When the high potential is applied to the gate and the SCR (SCR1) is triggered and turned on, the power of the bridge diode BD is normally supplied to the capacitor C and is applied to the plurality of power supply units 7.

In addition, if Vs becomes lower than Vin after the SCR (SCR1) is turned on, a low potential is applied to the gate of the SCR (SCR1) to turn off. When Vs becomes higher than Vin, the high potential is applied to the gate of the SCR (SCR1). It will repeatedly perform a series of operations that are turned on as authorized.

If the power saving mode is entered, the synchronous signal S is not input at this time, so that the charges charged in the capacitor C1 of the power saving mode detection unit 11 are discharged through the resistor R3. Accordingly, the SCR control unit 12 The low potential is applied to the base of the transistor Q1 of to turn on the transistor Q1.

As such, when the transistor Q1 is turned on, the voltage VT2 of the transformer T2 remains zero, so that even when Vs is higher than Vin, the gate of the SCR (SCR1) becomes a low potential and cannot be triggered, thus turning off. It is in a state.

Therefore, in the off mode, the power output through the bridge diode BD is not supplied to the transformer T1 in the off state of the SCR SCR1, so that operating power is not applied to the plurality of power units 7 at all. will be.

Subsequently, when the user presses a key on the keyboard and the synchronization signal S is applied, the SCR (SCR) of the SCR driver 13 is controlled through the power saving mode detecting unit 11 and the SCR driving controller 12 according to the above-described operating principle. When SCR1) is turned on, power is supplied to the transformer T1 so that the monitor can be used normally.

As described above, the present invention has the effect of maintaining the power consumption of less than 1W in the power saving mode by automatically shutting off the power supply of the transformer (T1) in the power saving mode to stop the power supply to the monitor. The present invention has an advantageous advantage that the power consumption can be reduced as much as possible when applied to a monitor as well as a printer.

Claims (4)

A transformer T1 for converting and supplying a power supply voltage input to a monitor coupled to a computer main body to a predetermined level, and a control IC connected to the primary side of the transformer T1 to control driving of the transformer T1 ( In the power supply circuit of the monitor provided with 2), a synchronization signal input from the computer main body, for example, a power saving mode detection unit 11 generating a power saving mode (OFF mode) output signal depending on whether horizontal and vertical synchronization signals are inputted. And the switching function according to the output signal of the power saving mode detection unit 11, for example, the SCR driving control unit 12 generating the switching control signal of the SCR, and the SCR switching control signal of the SCR driving control unit 12. And an SCR driver (13) which is operated to block driving of the transformer and completely cut off power supply to the secondary side of the transformer. According to claim 1, The power saving mode detection unit 11 is a diode (D1) for detecting a synchronization signal from the computer body is connected to the base terminal of the transistor (Q1) of the SCR drive control unit 12, the diode ( And a capacitor (C1) and a resistor (R3) for charging and discharging the charge of the synchronizing signal voltage input through D1), respectively, in parallel with the diode (D1). The ultra-power saving circuit according to claim 1, wherein the SCR driving control unit 12 includes a transistor Q1 which is driven according to the charging and discharging action of the capacitor C1 to control the operation of the transformer T2. . 2. The SCR driver (13) according to claim 1, wherein the SCR driver (13) includes an SCR (SCR11) switched according to a potential of a gate, a resistor (R1) connected between the anode and the transformer (T2) of the SCR, and the resistor (R1). ) And a resistor (R2) connected in parallel with the gate of the SCR.