JP2000217357A - Power supply module provided with power-saving control function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply module following the E2000 or TC099 rule and other power saving rules for energy source by developing an energy- saving source control technology at a low cost so that the technology may meet the present tendency. SOLUTION: A power supply module which enters a power-saving mode in response to a signal is provided with a power supplier having a modulator that makes electric power to be outputted stably by controlling the module, and a control circuit 22 which is connected to the power supplier and controls the modulator so that the power supplier may enter the power-saving mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply module having a power saving control function, and more particularly to a power supply module which achieves a power saving purpose by controlling a turn-off of a modulator of a power supply in a monitor.

[0002]

2. Description of the Related Art All monitors currently in practical use are E.
In line with the PA, VESA, and NUTEK energy source power saving rules, the minimum power saving standard is 5 watts or less. In the future, there are E2000, TC099 rules, and the minimum power saving wattage requirement. Is 3 watts or less. According to the control based on current circuit design, to meet the requirements of E2000 and TC099,
Relatively expensive design costs are required.

FIG. 8 is a block diagram of a conventional energy source power saving control, which mainly includes a transformer Tr, a pulse width modulator PWM, and an auxiliary power supply Aux. Power, an electronic switch SW, and a microcontroller MCU are provided. When the monitor is operating normally, the electronic switch SW is turned on the transformer Tr and supplies the output power Vo to the monitor for use. The power supply has three voltages of 80 volts, 15 volts and 6.3 volts, and the microcontroller is also adapted to receive an internally generated signal S, for example a horizontal signal Hs or a vertical signal Vs of the screen. Then, when the monitor enters the power saving mode and the horizontal signal or the vertical signal disappears, the microcontroller controls the electronic switch thereby to turn off the output power supply Vo.

A conventional power saving control circuit for an energy source includes, on the secondary side of the transformer Tr, a set of electronic switches for controlling power and a set of auxiliary power supply Aux. By increasing the power to supply power to a control circuit, for example, a microcontroller MCU, the operation state of the main power supply is controlled. This achieves the purpose of power saving control, but increases design costs accordingly and increases the complexity of the design circuit.

[0005]

That is, in the above-described conventional power saving mode, the microprocessor must cope with the wake-up when the signal S appears again, so that the auxiliary power supply Aux. Since power must be provided for basic operation, power consumption is inevitable. Further, since the output power of the electronic switch SW is merely turned off, only the inside of the monitor and the circuits related thereto can save power, and the other elements inside the power supply source are set to the state of saving power easily. Can not do. As a result, even if the load on the power supply source drops only, the objective of substantial power saving cannot be achieved. Further, in reality, electric current is constantly flowing through components such as the transformer Tr and the pulse width modulator PWM, so that power is continuously consumed.

In order to maintain the conventional functions and meet the requirement of reducing the power consumption to 3 watts or less in the above power saving mode, the power supply inside the power supply is obviously required at relatively high design cost. Every effort must be made to improve each part. However, this is contrary to the current trend of low price and low cost calculators. In this regard, conventional approaches are clearly incompatible and are not worth taking.

[0007] In view of the above, a main object of the present invention is to develop a low-cost energy-saving control technology in accordance with the current tide, and to comply with the rules of E2000 and TC099 and other energy source power-saving rules. Is to provide.

[0008]

In order to achieve the above object, a power supply module having a power saving control function according to the present invention is a power supply module which enters a power saving mode in response to a signal. A power supply having a modulator for controlling a module to stably output a power supply, the power supply being connected to the power supply, controlling the modulator in accordance with the signal, and controlling the power supply by the modulator. And a control circuit for controlling so as to enter the power saving mode.

In the power supply module, the signal may be a horizontal signal or a vertical signal.

Further, the power supply is further connected to the modulator, and after outputting the power supply stably under the control of the modulator, the power supply is fed back to the modulator. And a switch circuit connected to the transformer and controlling the output of the power supply, and a microcontroller connected to the switch circuit and controlling a switch of the switch circuit according to the signal. be able to.

In the above-mentioned starch, the switch circuit may be a transistor circuit, and the modulator may be a pulse width modulator.

Further, the control circuit is connected to the signal voltage control circuit for switching to a first voltage signal in accordance with the signal, the modulator and the signal-voltage control circuit, and controls the signal voltage in response to the first voltage signal. And a power-saving delay control circuit for controlling the modulator by generating a second voltage signal.

[0013] The control circuit may further include an indicator lamp for changing a display color according to the voltage of the feedback signal.

[0014] The color of the display may be determined by two different colored emitting diodes within the indicator lamp control circuit.

[0015] The signal-voltage control circuit and the power-saving delay control circuit are electrically connected to an optical coupling switch, whereby the first voltage signal is transmitted through photoelectric switching. It can be transmitted to the power saving delay control circuit.

Further, the power saving delay control circuit further comprises:
In addition to properly guiding the operation of the power supply in response to the first start-up of the power supply module, when the power supply enters the power saving mode, the power supply is turned off after a certain delay. Further, when the power supply device enters the power saving mode, a first voltage signal is generated according to the signal, and the power saving delay control circuit can stop the operation.

When the power saving delay control circuit stops operating, the power supply is turned on.

[0018]

The power supply module having the function of power saving control according to the present invention turns on or off the pulse width modulation integrated circuit by controlling the input / output terminal of the error amplification of the pulse width modulation integrated circuit. As described above, there is no need to separately control the state of the pulse width modulation integrated circuit after the power is supplied to the microcontroller by the auxiliary power supply, and the object of the low-cost energy-saving source control can be achieved by taking advantage of the current trend.

[0019]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram of a power supply source which is a power supply module having a power saving control function according to the present invention. The power supply module enters the power saving mode in response to the disappearance of the signal S (the horizontal signal Hs or the vertical signal Vs of the screen), and is switched to the operation mode when the detection signal appears again. The power supply 21 mainly includes a transformer Tr, a pulse width modulation integrated circuit PWM,
It comprises a microcontroller MCU and an electronic switch SW. The modulator PWM controls the power supply module so as to stabilize the output power supply Vo. Control circuit 2
2 is connected to the power supply 21 and controls the pulse width modulator PWM in the power supply according to the appearance or disappearance of the signal, and the power supply 21 switches the pulse width modulator PWM to the power saving mode or the operation mode. Control to enter.

The present invention differs from the prior art in that the auxiliary power supply Aux. Power microcontroller MC
U and the horizontal signal Hs or the vertical signal Vs by the direct control circuit 22 in the power saving mode.
Is detected, and the power supply source 21 is woken up based on this. Therefore, the cost required for the auxiliary power supply can be saved.

In the power saving mode, the control circuit 22 directly controls the pulse width modulator P so that no voltage is output.
The WM is controlled. At that time, the pulse width modulator PWM
And the transformer Tr is maintained in an operation stop state,
More power can be saved and thus 3W according to the latest energy source regulations E2000 and TC099
Can be met.

Of course, the most important point of interest is the control circuit 2
2 can be achieved with relatively inexpensive circuits, which greatly reduces the cost of the overall power supply module.
The operation and principle of the control circuit 22 will be described in detail below.

FIG. 2 is a circuit diagram showing one embodiment of the power supply source according to the present invention. In the figure, the transformer Tr stably outputs voltages of 80 volts, 15 volts, and 6.3 volts under the control of the pulse width modulator PWM. Diode D2
01, D202 and D203, and capacitor C20
1, C202 and C203 serve for rectification and filtering. The transistors Q201 and Q202 are controlled by the microcontroller MCU (IC201), and when the horizontal signal Hs or the vertical signal Vs enters the power saving mode and disappears, the output voltage is turned out to output another circuit of the monitor. To enter the power saving mode. In addition, the present invention further transmits the detection results of the horizontal signal Hs and the vertical signal Vs to the inside of the power supply 21 through the operation of the signal-voltage control circuit and the power-saving delay control circuit 32, and outputs the pulse width modulator PWM. (IC101) and the operation of the transformer Tr are stopped. This saves more on power costs.

The optical coupling integrated circuit IC 102
Is in the operation mode, the output voltage is fed back to the pulse width modulator PWM to maintain a stable output voltage.

The control circuit 22 mainly includes a signal-voltage control circuit 33 and a power saving delay control circuit 32.
Further, an indicator lamp control circuit is provided. The signal-voltage control circuit 33 controls the horizontal signal Hs and the vertical signal V of the screen.
Switching to the first voltage signal V1 according to s. The power saving delay control circuit 32 is connected to the modulator PWM and the signal-voltage control circuit 33, and outputs a second signal according to the first voltage signal V1.
Generates a voltage signal V2 of the pulse width modulator PWM (IC1
01) is controlled. The instruction lamp control circuit 31 changes the display color depending on whether or not there is a feedback of the synchronization signals + FB and -FB.

That is, the main function of the signal-voltage control circuit 33 is that when it is detected that either the horizontal signal Hs or the vertical signal Vs is input while the power supply is in the power saving mode, the optical The ring integrated circuit IC 104 is turned on, the operation of the power saving delay control circuit 32 is stopped, and the power supply source 21 is turned on. The main purpose of the power saving delay control circuit 32 is to prevent malfunction from occurring when the power supply source 21 is first started for the first time.
When approaching the power saving mode state, the power supply source 21 is first started after a certain time delay so as not to cause a malfunction of the internal circuit. The instruction lamp control circuit 31 controls the color change of the emitting diode by the synchronization signals + FB and -FB. The normal operation mode is green and the power saving mode is orange.

Hereinafter, each block diagram for the control circuit will be described.

FIG. 3 shows a signal-voltage control circuit according to the present invention, in which 6.3 V, Hs, Vs and +5 V signal upstream of USB are applied to four signal-voltage control input terminals, respectively.
There is voltage. Under normal operation, all four signal-voltages are present and when the capacitor C204 is charged to a certain voltage level, the optical coupling integrated circuit IC104
Is conducted. This optical coupling integrated circuit IC104
Is in a conductive state, the power saving delay circuit is turned off, and the entire power supply 22 is operated normally.

In the power saving mode, Hs and Vs
And the USB upstream are both in a low potential (Low) state. At this time, the transistor Q203 is turned off again by the judgment of the microcontroller, and the constant voltage diode Z
D201 is turned off. At this time, the first voltage V1
Is low, the optical coupling integrated circuit IC104 is turned off and the power saving delay control circuit is turned on, so that the pulse width modulator PWM (IC101) for controlling the main power supply is turned on. Then, after the pulse width modulator PWM (IC101) is turned off, all the power is turned off, and the object of power saving that the power consumption is smaller than 3 W is achieved.

FIG. 4 shows a power saving delay control circuit. When the first voltage V1 is low, the optical coupling integrated circuit IC1
04 is turned off. At this time, the capacitor C102
Starts charging, and when it reaches 3.6V, the transistor Q1
02 is conducted, and the pulse width modulator PWM (IC101)
The output of the error amplifier (error Amp) inside the connection pin 1 is pulled down to a low potential by the transistor Q102. When the connection pin 1 of the pulse width modulator PWM is pulled down to a low potential, the operation is stopped and the transformer T
Since the control to r is released, the entire power supply source 21 goes into the cutout state, thereby achieving the purpose of the power saving control.

If the power supply 21 is started for the first time, since the capacitor C102 is momentarily short-circuited and the charging voltage disappears, the constant voltage diode ZD101 and the transistor Q102 are not turned on, and the pulse width modulation is performed. The device PWM (IC 101) is started normally.

FIG. 5 shows a modification of the power saving delay control circuit. Since a different kind of pulse width modulator integrated circuit is used and integrated with the field effect transistor (FET),
There is no need to separately connect an FET on the connection, and it is sufficient to directly output the FET to the transformer Tr. Note that the connection pinch is an input terminal of the constant-pressure feedback, and the optical coupling integrated circuit IC1
02 is a constant pressure feedback integrated circuit.

FIG. 6 shows another modification of the power saving delay control circuit. The same circuit control can be used on a UC3842 or a different type of the same standard pulse width modulator integrated circuit. Among them, the connection pin 1 and the connection pin 2 are connected to the power saving delay control circuit.

FIG. 7 shows an instruction lamp control circuit. During normal operation, the feedback voltage + FB induces one pulse from the horizontal circuit of the monitor by a coupling method, and the diode D
DC level Vc via capacitor 104 and capacitor C103
To rectify. After the DC level Vc is established, the transistor Q102 is induced, and the voltage Vb becomes low. When the voltage Vb is low, the constant current circuit is turned out and no current flows, so that the orange lamp of the light emitting diode does not light. On the other hand, the diode D103
Is turned on at this time, and the green lamp of the light emitting diode is turned on. The manual switch SW101 is provided with 1A, 1B or 3A, with the power switches 2A and 2B of the monitor as the center point.
3B.

Then, when the operation proceeds to the power saving mode, there is no signal in the feedback signal + FB, and the voltage Vc becomes low potential.
When the transistor Q103 is turned off and the constant current circuit operates normally, the current is provided to flow through the orange light emitting diode and is displayed on the orange lamp.

[0036]

As can be seen from the description of the above embodiment, the present invention achieves the power saving function of the power supply source by a low cost design method, and the input / output terminal of the error amplification of the pulse width modulation integrated circuit is provided. The control turns on or off the pulse width modulation integrated circuit. Therefore, it is not necessary to separately control the state of the pulse width modulation integrated circuit after supplying power to the microcontroller by the auxiliary power supply separately from the conventional power supply, and to achieve the purpose of low-cost energy saving source control on the current trend. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power supply source according to the present invention.

FIG. 2 is a circuit diagram of a power supply according to the present invention.

FIG. 3 is a diagram of a signal-voltage control circuit according to the present invention.

FIG. 4 is a diagram of a power saving delay control circuit according to the present invention.

FIG. 5 is a diagram showing a modification of the power saving delay control circuit according to the present invention.

FIG. 6 is a diagram showing another modified example of the power saving delay control circuit according to the present invention.

FIG. 7 is a diagram of an indicator lamp control circuit according to the present invention.

FIG. 8 is a block diagram of a conventional power supply source.

[Explanation of symbols]

 Reference Signs List 21 power supply source 22 control circuit Tr transformer PWM pulse width modulation integrated circuit MCU microcontroller Vo power supply Hs screen horizontal signal Vs screen vertical signal

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Chen Jian-Hong, 335-5-1, Inner Lake Road, Lake District, Taipei City, Taiwan F (72) Inventor Chen Ronghua Taiwan Group 230 No. 4

Claims (9)

[Claims] 1. A power supply module having a power saving control function for entering a power saving mode in response to a signal indicating an operation state of a power supply destination, wherein a modulation for controlling the power supply module to stably output a power supply. A power supply having a controller, connected to the power supply, controlling the modulator in response to the signal, and controlling the power supply to enter the power saving mode by the modulator. A power supply module having a power saving control function characterized by comprising a circuit. 2. The power supply module according to claim 1, wherein the signal is a horizontal signal or a vertical signal of a monitor. 3. The power supply, further comprising: a power supply connected to the modulator, for outputting the power supply stably under the control of the modulator, and for returning the output power supply to the modulator. And a switch circuit connected to the transformer to control the output of the power supply; and a microcontroller connected to the switch circuit and controlling a switch of the switch circuit according to the signal. The power supply module having the power saving control function according to claim 1. 4. The module according to claim 4, wherein the switch circuit is a transistor circuit, and the modulator is a pulse width modulator (PWM). 5. The control circuit is connected to a signal-voltage control circuit for switching to a first voltage signal in accordance with the signal, the modulator and the signal-voltage control circuit, and controls the signal in response to the first voltage signal. The power supply module according to claim 1, further comprising a power saving delay control circuit that generates the second voltage signal and controls the modulator. 6. The control circuit further includes an indicator lamp for changing a display color according to a feedback signal voltage, wherein the display color is determined by two different color emitting diodes inside the indicator lamp control circuit. A power supply module having a power saving control function according to claim 5. 7. The signal-voltage control circuit and the power-saving delay control circuit are electrically connected to an optical coupling switch, whereby the first voltage signal is transmitted via photoelectric switching. The power supply module with a power saving control function according to claim 5, wherein the power supply module transmits the power to a power saving delay control circuit. 8. The power-supply delay control circuit further controls the power-supply device to operate normally, and when the power-supply device enters the power-saving mode, the power-supply delay control circuit delays the power-supply device after a certain time delay. Further turning off the power supply, and when the power supply enters the power saving mode, a first voltage signal is generated according to the signal, and the power saving delay control circuit stops operation. Item 6. A power supply module having the power saving control function according to Item 5. 9. The power supply module according to claim 8, wherein when the power saving delay control circuit stops operating, the power supply is turned on.