KR970001361B1 - Apparatus and method for economy in power consumption - Google Patents

Abstract

A power saving circuit reduces a power-consumption in a standby state by adding an additional power saving circuit to TVCR(television & video & cassette & recorder). The circuit includes: a full-wave rectifier for outputting a DC power; a power value converter for converting the DC power into at least predetermined DC powers; a standby power reduction controller which connects the DC power from the full-wave rectifier to the power value converter, or cuts off a connection between the DC power and the power value converter; a key input means having a standby state power saving key; a main controller for outputting the power saving control signal by selecting the standby state power saving key; and an auxiliary power supply means for providing the standby power to the main controller in a system standby state wherein a DC power is cut off.

Description

Power-saving circuit and its control method in system with standby power

1 is a conventional circuit diagram showing a power supply state of a TVCR having a standby power source.

2 is a circuit diagram of the present invention showing a state in which standby power is supplied from a system having standby power, in particular a TVCR.

3 is a control flow chart for controlling standby power in the microcomputer 20 of FIG.

* Explanation of symbols for main parts of the drawings

2: full-wave rectifier 4: transformer

6 power supply transistor 8 starting resistance

10: photocoupler 12: regulator

20: Micom 30: Backup Battery

40: key input unit 50: LED

100: standby power saving circuit 102: rectifier

104: relay 106: transistor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system having a standby power supply, and more particularly, to a power saving circuit for reducing power consumption in a standby state by adding a separate power saving circuit to a television video cassette recorder (TVCR) having a standby power supply.

Nowadays, society's interest in energy saving is enormous, and energy-saving devices are being produced one after another. There are many types of such products that can save energy by maintaining a standby state when not in use. These products are intended to provide power savings by supplying only the necessary circuit parts without operating the device in power systems using standby power, whether industrial or public.

FIG. 1 shows a power supply state of a conventional TVCR having a standby power supply, which shows a power supply state of a TVCR (Television Video Cassette Recorder) having a conventional standby power supply. An operation of supplying power in a system having standby power will be described with reference to FIG. A representative example of the TVCR is video vision.

When AC power AC is input, the full-wave rectified DC voltage DC is applied to the primary windings LP and LD of the transformer 4, which operates the power supply transistor 6 to operate the secondary windings S1, S2, and The voltages Va, Vb, Vc, and Vd are driven to S3 and S4. At this time, each of the voltages Va, Vb, Vc, and Vd on the secondary windings S1, S2, S3, and S4 becomes a no-load output voltage, that is, a standby power source, which outputs a constant voltage at all times whether the TVCR is on or off.

In more detail, the AC voltage AC is output at the predetermined DC voltage value DC from the full-wave rectifier 2 via the fuse FS. The DC voltage value DC is applied to the collector of the power supply transistor 6 through the primary winding LP of the transformer 4 and applied to the base of the power supply transistor 6 through the starting resistor 8 to thereby supply the power supply transistor 6. ) Will be activated. The DC voltage value DC is also provided to the primary winding LD of the transformer 4 via the starting resistor 8. The voltage applied to the primary winding of the transformer 4 by the operation of the power supply transistor 6 is induced with a voltage corresponding to the turns ratio in the secondary windings S1, S2, S3, S4. Here, the voltage Va output from the secondary winding S1 has the highest voltage among the voltages (6V, 14V, 15V, 125V) of which the reference voltage is output. At this time, the portion of the circuit for detecting a change in current according to the change in power consumed by the secondary winding is the porter coupler 10, which is connected to the secondary winding S1 generating the reference voltage Va. The photocoupler 10 senses a change in the current that is changed in the secondary winding S1, which becomes a reference voltage, and applies a current corresponding to the change to the base of the power supply transistor 6. Accordingly, the power supply transistor 6 adjusts the voltage induced in the primary winding by forming an operating point based on the amount of current applied to the base. As a result, voltages Va, Vb, Vc, and Vd required on the secondary side of the transformer 4 are output. However, the standby power required in the standby state is only needed to drive the microcomputer. That is, only the microcomputer power supply Vd outputted from the secondary winding S4 of the transformer 4 and applied to the microcomputer through the regulator 12 is required.

Since the power supply in the system having the standby power supply is the same as that of the circuit of FIG. 1, unnecessary load and leakage current in the remaining lines S1, S2, and S3 of the secondary windings of the transformer 4 cause power consumption. In addition, power consumption is caused by leakage current caused by passive elements such as diodes D1 to D3 and capacitors C1 to C3. Standby power consumption in a system having a standby power source as shown in FIG. 1 is typically 10 to 20 watts, which causes considerable power consumption.

Accordingly, an object of the present invention is to provide a circuit and a control method for reducing standby power supplied in a standby state in a system having standby power.

Another object of the present invention is to provide a circuit and a control method for interrupting power consumed by leakage current due to unnecessary standby power other than standby power that is driven in a standby state in a TVCR.

The present invention for achieving the above object of the present invention, a system having a standby power source, full-wave rectifying means for outputting a DC power by full-wave rectifying the AC power applied to the power; Power value converting means for converting the DC power source into at least two predetermined DC power sources to provide a main power source necessary for a plurality of circuit units in the system; Standby power saving control means located in the full-wave rectifying means and the power value converting means, the standby power saving control means for connecting and blocking the DC power provided from the full-wave rectifying means to the power value converting means by a predetermined power saving control signal; Key input means having a standby state power saving key; Main control means for outputting the power saving control signal by the user selecting the standby power saving key; DC power cut-off system characterized in that the auxiliary power supply means for supplying the standby power to the main control means in the standby state.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 shows a circuit diagram for supplying standby power in a system having a standby power, in particular a TVCR.

In the present invention, as shown in FIG. 2, a standby power saving circuit 100 for blocking supply to unnecessary standby power in FIG. 1, a backup battery 30 for supplying power to the microcomputer 20 in a standby state, and The microcomputer 20 includes a microcomputer 20 having a program for performing control of standby power, a peripheral circuit unit, a key input unit 40, and an LED 50. In FIG. 2, the same reference numerals and symbols as those in FIG. 1 are the same as those described in FIG. 1, and the operation according to the configuration is also the same.

The standby power saving circuit 100 includes a diode D6, D7 for half-wave rectifying AC power AC through a resistor R1 connected to an output line to which AC power AC is applied, and a capacitor C6 for smoothing half-wave rectified current. A rectifier 102 for outputting power; The primary side is connected to the rectifier 102 through a resistor R2, and an input terminal is connected to the output line of the full-wave rectifier 2, and a base is connected to the first power control terminal PW1 of the microcomputer 20. The collector is connected to the secondary side of the relay 104, and is composed of a transistor 106 that is operated by the standby power control signal PCNT1 provided by the microcomputer 20 to control the relay 104.

The microcomputer 20 stores a program for providing a standby power control signal PCNT1 for controlling the relay 104 and a power supply control signal PCNT2 for supplying the microcomputer power supply Vd provided from the regulator 12 to the system. Holds on. In addition, the microcomputer 20 is connected to the backup battery 30 to receive the power required in the system standby state. Key input unit 40 attached to a predetermined set (SET) of the system so that the user selects the standby power control program held by the microcomputer 20, and the LED 50 to display the control step for the standby power supply microcomputer 20 ), Each control information is interfaced.

FIG. 3 is a control flow chart for executing the standby power control program in the microcomputer 20 of FIG. 2. As the power key is input from the key input unit 40, the system standby state → system operation ready state → system operation state is repeatedly performed. It consists of the following procedure.

The operation of the present invention will be described in more detail with reference to FIGS. 2 and 3.

In the standby state of the system, the microcomputer 20 that requires standby power supply is operated by receiving the microcomputer power supply Vd through the backup battery 30. At this time, AC power AC is converted into DC power DC via rectifier 102 of full-wave rectifier 2 and standby power saving circuit 100. However, since the relay 104 is in the off state, the power supply transistor 6 does not operate so that no current loop is formed in the primary windings LP and LD of the transformer 4, and voltage is also applied to the secondary winding of the transformer 4. Since it is not abandoned, there is no unnecessary power consumption in the system standby state. At this time, the microcomputer 20 maintains the system standby state in step 100 of FIG. When the user inputs the power key on the key input unit 40 attached to the predetermined set of the system in step 302, the microcomputer 20 responds to the standby power control signal through the first power control terminal PW1 in step 304. Output with PCNT1 = 1 status. That is, the standby power control signal PCNT1 is applied to the transistor 106 in the standby power saving circuit 100 in the 'high' state. As the transistor 106 operates in response to the application of the standby power control signal PCNT1, the DC power provided from the rectifying unit 102 is grounded at the collector of the transistor 106 through the primary side and the secondary side of the relay 104. Discharged into an emitter. Accordingly, the relay 104 is switched on. The DC voltage value DC output from the full-wave rectifier 2 operates the power supply transistor 6 through the relay 104 which is switched on. As the power supply transistor 6 operates, a constant voltage necessary for each circuit part is supplied through the primary winding and the secondary winding of the transformer 4. For example, the voltage Va can be used as a main power source for a television, the voltage Vb can be used as a power source for a system integrated circuit, and the voltage Vc can be used as a video recorder (VCR) motor power source. In addition, the voltage Vd is input to the microcomputer 20 through the regulator 12 and used as a microcomputer power supply.

After performing step 304 of FIG. 3, if the user presses the power key again in step 306 through the key input unit 40, the microcomputer 20 transmits the power supply control signal PCNT2 = to the second power control terminal PW2 in step 308. Outputs 1 That is, when the power supply control signal PCNT2 is output in the 'high' state, the main power is supplied to the entire system and the entire system is operated. In addition, the microcomputer 20 notifies the user by turning on the LED 50 that the main power is supplied to the entire system in step 308. The LED 50 is turned on through the LED driver.

On the other hand, when the user wants to maintain the standby power saving state is performed by pressing the power key of the key input unit 40 once more, the user presses the power key in step 308 of FIG. 3, the microcomputer 20 is the power key in step 310 Determine the input. If the power key is input in step 310, the microcomputer 20 outputs the standby power control signal PCNT1 = 0 to the first power control terminal PW1 and the standby power control signal PCNT2 = 0 to the second power control terminal PW1 in step 312. , LED 50 is turned off. Since the transistor 106 is not operated by the power supply control signal PCNT2 = 0, the relay 104 is switched off. Therefore, the system maintains the standby state as in step 300, and the power supply maintains the standby power saving state. That is, the microcomputer 20 is supplied with battery power by the backup battery 30 as described above.

As described above, the present invention has an effect of eliminating unnecessary power consumption by supplying standby power only to a necessary circuit part in a system having a standby power source, particularly a TVCR. In addition, the power saving circuit in the system having the standby power source proposed in the present invention has the advantage of improving the stability and horizontality of the power supply system by eliminating unnecessary loads and short circuits in the system, the circuit configuration is simple and economical.

Claims (6)

A system having a standby power source, comprising: full-wave rectifying means for full-wave rectifying an AC power applied as a power source to output a DC power source; Power value converting means for converting the DC power source into at least two predetermined DC power sources to provide a main power source necessary for a plurality of circuit units in the system; Standby power saving control means located in the full-wave rectifying means and the power value converting means, the standby power saving control means for connecting and blocking the DC power provided from the full-wave rectifying means to the power value converting means by a predetermined power saving control signal; Key input means having a standby state power saving key; Main control means for outputting the power saving control signal by the user selecting the standby power saving key; A DC power saving circuit in the system having standby power, characterized in that the auxiliary power supply means for supplying the standby power to the main control means in the controlled system standby state. 2. The apparatus of claim 1, wherein the standby power saving control means comprises: switching control means for operating in response to the power saving control signal and outputting a switching selection signal; And a switching means connected to said full-wave rectifying means and said power value converting means, said switching means being configured to perform first and second switching operations in response to said switching selection signal. 3. The power saving circuit in a system having a standby power supply according to claim 2, wherein said switching means comprises a relay which is turned on in the first switching operation and turned off in the second switching operation. 4. The apparatus of claim 3, wherein the switching selecting means comprises: a rectifying unit rectifying the AC power and outputting the rectified AC power; And a transistor operated by receiving the power saving control signal as a base while the driving DC power is applied to the collector through the relay. The air conditioner according to claim 4, wherein the rectifier comprises a diode D6 and D7 for half-wave rectifying the AC power and outputting a predetermined signal, and a capacitor C6 for smoothing the half-wave rectified signal from the diodes D6 and D7. Power saving circuits in systems with power. A power saving circuit control method for a system having a key input unit having a power key and a standby power connection or standby power saving control means by a predetermined control, the standby power saving control means by the key input unit and the first power key input Outputting a signal for controlling standby power corresponding to turning on standby power; Displaying, by the second power key input of the key input unit, a power supply control signal output corresponding to a main power supply to the system and predetermined light emitting means; And a third power key of the key input unit cuts off the standby power and the main power supply and outputs a control signal to maintain a power saving state.