JP2002354510A - Power consumption display device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To devise a simple power display device that is a measure of power consumption in actual use of a television receiver. SOLUTION: The primary winding of a current transformer T1 is set to AC.
The voltage is proportional to the current waveform flowing in the AC line as a secondary winding voltage, rectified by rectifier diodes D1 and D2, and smoothed to a DC voltage by a smoothing capacitor C1. / D port,
The microcomputer 1 calculates a value proportional to the instantaneous value of the power consumption, and performs an OSD display corresponding to a number or a bar graph on the video display unit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power consumption display device for a television receiver.

[0002]

2. Description of the Related Art Conventionally, the power consumption of a television receiver is merely indicated by the rated power consumption on a back cover or the like.

[0003]

In recent years, there has been a demand for lower power consumption of electronic devices, and lower power consumption has similarly been demanded for television receivers. The user has a high interest in energy saving, and as a means of appealing for energy saving, we have devised a simple power display device that can be a measure of power consumption in actual use of a television receiver.

[0004]

In order to solve the above-mentioned problems, a power consumption display device according to the present invention connects a primary winding of a current transformer to an AC line, and outputs a voltage proportional to a current waveform flowing through the AC line. The voltage is detected as the next winding voltage, rectified by a rectifier diode, smoothed to a DC voltage by a smoothing capacitor, and input to an A / D port of a microcomputer. The voltage is a value proportional to the instantaneous power of the television receiver, and the value is proportional to the power consumption by numerically displaying the value on the OSD or displaying a bar graph equivalent.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a primary winding of a current transformer is connected in series to an AC line, and a voltage proportional to a current waveform flowing through the AC line is defined as a secondary winding voltage. Detected, rectified by rectifier diode, smoothed to DC voltage by smoothing capacitor,
/ D port, and the microcomputer calculates a value proportional to the instantaneous value of the power consumption and displays it as an OSD equivalent to a number or a bar graph. This has the effect that the standard of the value can be easily displayed.

According to a second aspect of the present invention, the primary winding of a current transformer is connected in series to an AC line,
A voltage proportional to the current waveform flowing in the C line is detected as a secondary winding voltage, rectified by a rectifier diode, smoothed to a DC voltage by a smoothing capacitor, and an average voltage is obtained by a filter circuit having a certain time constant. , Input to the A / D port of the microcomputer, calculate the value proportional to the average value of the power consumption by the microcomputer, and display an OSD equivalent to a number or a bar graph. This has the effect that the standard of the average value of the power consumption can be easily displayed.

According to a third aspect of the present invention, a primary winding of a current transformer is connected in series to an AC line,
A voltage proportional to the current waveform flowing through the C line is detected as a secondary winding voltage, rectified by a rectifier diode, smoothed to a DC voltage by a smoothing capacitor, and input to an A / D port of a microcomputer. By measuring the accurate power consumption, storing the value in the first memory, and controlling the level conversion circuit with the microcomputer, it calculates the almost accurate power consumption and displays OSD equivalent to figures or bar graphs. This has the effect that the user can easily display the almost accurate value of the instantaneous value of the power consumption of the television receiver.

According to a fourth aspect of the present invention, a primary winding of a current transformer is connected to an AC line in series, and A
A voltage proportional to the current waveform flowing through the C line is detected as a secondary winding voltage, rectified by a rectifier diode, smoothed to a DC voltage by a smoothing capacitor, input to an A / D port of a microcomputer, and accurately measured by a power meter. The power consumption is measured, stored in the first memory, and the microcomputer controls the level conversion circuit to calculate a nearly accurate power consumption. On the other hand, the time during which the television receiver is being received is stored in the second memory, the average power consumption is multiplied by the time during which the television receiver is being received to calculate the integrated power, and the number or the number is calculated. It is characterized by displaying an OSD equivalent to a bar graph, and has an effect that the user can easily display the integrated power of the television receiver.

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG.

FIG. 1 shows a power consumption display device according to a first embodiment of the present invention. In FIG.
This is a current transformer that is connected in series to the C line and detects a voltage proportional to a current waveform flowing through the AC line as a secondary winding voltage. R1 is a resistor for detecting a voltage obtained on the secondary winding of the current transformer T1. D1 and D2 are rectifier diodes that rectify the AC voltage obtained by the resistor R1. C1 is a smoothing capacitor for smoothing the voltage rectified by the rectifier diodes D1 and D2. 1 is a microcomputer. The terminal of the microcomputer 1 is a smoothing capacitor C
An A / D port terminal for inputting the voltage obtained at 1.
The terminal of the microcomputer 1 is a terminal for outputting an on-screen display (hereinafter, referred to as OSD) signal. Reference numeral 2 denotes a video display unit that displays an OSD signal obtained from a terminal of the microcomputer 1 on a screen.

The operation will be described below.

A pulse-like load current as shown in FIG. 5A flows according to the power consumption of the TV set in the AC line, and the peak value of the pulse increases as the load current increases. Similarly, a pulse-like load current as shown in FIG. 5A flows through the primary winding of the current transformer T1, and the peak value of the pulse increases as the load current increases. In the secondary winding of the current transformer T1, a pulse-like voltage proportional to the value is obtained. FIG. 5 shows that full-wave rectification is performed by the rectifier diodes D1 and D2.
A pulse-like voltage waveform as shown in FIG. The voltage is smoothed to a DC voltage by the smoothing capacitor C1, and a peak voltage of a pulse-like voltage is obtained. The voltage is input to the A / D port terminal of the microcomputer 1. The microcomputer 1 calculates an instantaneous value of the power consumption proportional to the voltage.

Assuming that the power consumption is P, the voltage input to the terminal of the microcomputer 1 is V, and the proportionality coefficient is K, the power consumption P can be expressed by the following equation. P = KV To explain with an example, assuming that V = 2V and K = 100, the power consumption P is the result of the following equation. P = 100 × 2 = 200 W An OSD signal indicating the number “200 W” is output from the terminal of the microcomputer 1 and displayed on the screen by the video display unit 2.

Embodiment 2 Hereinafter, Embodiment 2 of the present invention will be described with reference to FIG.

FIG. 2 shows a power consumption display device according to a second embodiment of the present invention, and a description of the same parts as in the first embodiment will be omitted.

Reference numeral 3 denotes a filter circuit having a certain time constant.

Hereinafter, the operation will be described.

A pulse-like load current as shown in FIG. 5A according to the power consumption of the TV set flows through the AC line, and the peak value of the pulse increases as the load current increases. Similarly, a pulse-like load current as shown in FIG. 5A flows through the primary winding of the current transformer T1, and the peak value of the pulse increases as the load current increases. A pulse-like voltage proportional to the value is obtained in the secondary winding of the current transformer T1. FIG. 5 shows that full-wave rectification is performed by the rectifier diodes D1 and D2.
A pulse-like voltage waveform as shown in FIG. The voltage is smoothed to a DC voltage by the smoothing capacitor C1, and a peak voltage of a pulse voltage is obtained. The voltage is input to the filter circuit 3. In the filter circuit 3, for example, if the time constant is set to 1/30 seconds, an average voltage of one frame can be obtained. The voltage is input to the A / D port terminal of the microcomputer 1. The microcomputer 1 calculates an average value of power consumption proportional to the voltage.

Assuming that the average value of the power consumption is Px, the average voltage input to the terminal of the microcomputer 1 is Vx, and the proportional coefficient is K, the average value Px of the power consumption can be expressed by the following equation. Px = KVx Explaining with an example, assuming that Vx = 1.5 V and K = 100, the power consumption Px is the result of the following equation. P = 100 × 1.5 = 150 W An OSD signal indicating the number “150 W” is output from the terminal of the microcomputer 1 and is displayed on the screen by the video display unit 2.

(Embodiment 3) Hereinafter, Embodiment 3 of the present invention will be described with reference to FIG.

FIG. 3 shows a power consumption display device according to a third embodiment of the present invention, and a description of the same parts as in the first and second embodiments will be omitted.

Reference numeral 4 denotes a level conversion circuit for converting the level of the DC voltage obtained by the smoothing capacitor C1. A power meter 5 accurately measures the power consumption of the television receiver. M1 is a first memory that stores the accurate power measured by the wattmeter 5 and the voltage input to the A / D port terminal of the microcomputer 1. The terminal of the microcomputer 1 is a terminal for exchanging data with the first memory M1.

The operation will be described below.

A pulse-like load current as shown in FIG. 5A flows according to the power consumption of the TV set on the AC line, and the peak value of the pulse increases as the load current increases. Similarly, a pulse-like load current as shown in FIG. 5A flows through the primary winding of the current transformer T1, and the peak value of the pulse increases as the load current increases. A pulse-like voltage proportional to the value is obtained in the secondary winding of the current transformer T1. FIG. 5 shows that full-wave rectification is performed by the rectifier diodes D1 and D2.
A pulse-like voltage waveform as shown in FIG. The DC voltage is smoothed by the smoothing capacitor C1, and a peak voltage of a pulse-like voltage is obtained. Here, the level conversion circuit 4 does not perform level conversion, and inputs the voltage as it is to the A / D port terminal of the microcomputer 1. The power consumption at this time is measured by the wattmeter 5 and written into the first memory M1.
Write the voltage input to the D port terminal. Further, the brightness of the screen is changed so that the power consumption changes, the power is measured again by the wattmeter 5, and the measured data is written to the first memory M1, and the voltage input to the A / D port terminal of the microcomputer 1 is written.

If the power consumption is P, the voltage input to the terminal of the microcomputer 1 is V, the proportional coefficient is x, and the correction value is y, the power consumption P can be expressed by the following equation. P = Vx + y Explaining a general example, first, the power measured by the wattmeter 5 is 220 W, the voltage input to the A / D port terminal of the microcomputer 1 is 2.0 V, and the brightness of the screen is reduced again. Alternatively, the power measured by the wattmeter 5 is 170 W, and the voltage input to the A / D port terminal of the microcomputer 1 is 1.5 V
220 = 2.0x + y 170 = 1.5x + y As described above, x = 100 and y = 20 are obtained from the two equations.

Next, in order to widen the input voltage range of the A / D port terminal of the microcomputer 1, the proportional coefficient x is reduced by half to 50,
The microcomputer 1 controls the level conversion circuit 4 so that the correction value y becomes 0, and converts the output voltage of the level conversion circuit 4.
This is represented by the following equation. P = 50V Explaining with a specific example, when the power measured by the wattmeter 5 is 220W, V = 4.4V from 220 = 50V. When the power measured by the wattmeter 5 is 170 W, V = 3.4 V from 170 = 50 V.

When the power measured by the wattmeter 5 is 220 W, the original input voltage was 2.0 V, but the output was 4.4.
V, and when the power measured by the wattmeter 5 is 170 W, the original input voltage was 1.5 V, but the output was 3.4 V.
Therefore, the voltage level conversion equation in the level conversion circuit 4 is as follows when the input voltage is Pin and the output voltage is Pout. Pout = 2Pin + 0.4 As described above, by expanding the input voltage range of the A / D port terminal of the microcomputer 1, more accurate power consumption can be calculated, and the OS representing the power consumption from the terminal of the microcomputer 1
The D signal is output and displayed on the screen by the video display unit 2.

(Embodiment 4) Hereinafter, Embodiment 4 of the present invention will be described with reference to FIG.

FIG. 4 shows a power consumption display device according to a fourth embodiment of the present invention.
The description of the same parts as in the third embodiment is omitted.

M2 is a second memory for storing the time during which the television receiver is receiving an image. Microcomputer 1
Is a terminal for exchanging data with the second memory M2.

Hereinafter, the operation will be described.

A pulse-like load current flows as shown in FIG. 5A according to the power consumption of the TV set on the AC line, and the peak value of the pulse increases as the load current increases. Similarly, a pulse-like load current as shown in FIG. 5A flows through the primary winding of the current transformer T1, and the peak value of the pulse increases as the load current increases. In the secondary winding of the current transformer T1, a pulse-like voltage proportional to the value is obtained. FIG. 5 shows that full-wave rectification is performed by the rectifier diodes D1 and D2.
A pulse-like voltage waveform as shown in FIG. The voltage is smoothed to a DC voltage by the smoothing capacitor C1, and a peak voltage of a pulse-like voltage is obtained. Here, the level conversion circuit 4 does not perform level conversion and inputs the voltage as it is to the A / D port terminal of the microcomputer 1. The power consumption at this time is measured by the wattmeter 5 and written into the first memory M1.
Write the voltage input to the D port terminal. Further, the brightness of the screen is changed so that the power consumption changes, the power is measured by the wattmeter 5 again, the result is written into the first memory M1, and the voltage input to the A / D port terminal of the microcomputer 1 is written.

If the power consumption is P, the voltage input to the terminal of the microcomputer 1 is V, the proportional coefficient is x, and the correction value is y, the power consumption P can be expressed by the following equation. P = Vx + y To give an example, the power measured by the wattmeter 5 is 220 W and the voltage input to the A / D port terminal of the microcomputer 1 is 2.0 V. The power measured by the total 5 is 170W, and the microcomputer 1
Assuming that the voltage input to the / D port terminal is 1.5 V, 220 = 2.0x + y 170 = 1.5x + y As described above, x = 100 and y = 20 are obtained from the two equations.

Next, in order to widen the input voltage range of the A / D port terminal of the microcomputer 1, the proportional coefficient x is reduced by half to 50,
The microcomputer 1 controls the level conversion circuit 4 so that the correction value y becomes 0, and converts the output voltage of the level conversion circuit 4.
This is represented by the following equation. P = 50V Explaining with a specific example, when the power measured by the wattmeter 5 is 220W, V = 4.4V from 220 = 50V. When the power measured by the wattmeter 5 is 170 W, V = 3.4 V from 170 = 50 V.

When the power measured by the wattmeter 5 is 220 W, the original input voltage was 2.0 V, but the output was 4.4.
V, and when the power measured by the wattmeter 5 is 170 W, the original input voltage was 1.5 V, but the output was 3.4 V.
Therefore, the voltage level conversion equation in the level conversion circuit 4 is as follows when the input voltage is Pin and the output voltage is Pout. Pout = 2Pin + 0.4 As described above, by expanding the input voltage range of the A / D port terminal of the microcomputer 1, more accurate power consumption can be calculated, and the value is stored in the first memory M1.

On the other hand, data is exchanged between the terminal of the microcomputer 1 and the second memory M2, and the time during which the television receiver is receiving an image is stored.

The microcomputer 1 calculates the integrated power by multiplying the average value of the power consumption stored in the first memory M1 by the time stored in the second memory M2.

It is assumed that the power consumption is T while the Px television receiver is receiving an image. Assuming that the integrated power is Pw,
The integrated power Pw can be expressed by the following equation. Pw = PxT To explain with an example, assuming that Px = 200 W and T = 2h, the integrated power Pw is a result of the following equation. Pw = PxT = 200 × 2 = 400 Wh An OSD signal indicating the number “400 Wh” is output from the terminal of the microcomputer 1 and is displayed on the screen by the video display unit 2.

[0039]

As described above, according to the first embodiment of the power consumption display device of the present invention, the user can easily display the standard of the instantaneous value of the power consumption of the television receiver.

According to the second embodiment of the power consumption display device of the present invention, the user can easily display the standard value of the average power consumption of the television receiver.

According to the third embodiment of the power consumption display device of the present invention, the user can easily display a nearly accurate instantaneous value of the power consumption of the television receiver.

According to the fourth embodiment of the power consumption display device of the present invention, the user can easily display the integrated power of the television receiver.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power consumption display device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a power consumption display device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a power consumption display device according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a power consumption display device according to a fourth embodiment of the present invention.

FIG. 5 is a signal waveform diagram of the power consumption display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microcomputer 2 Image display part 3 Filter circuit 4 Level conversion circuit 5 Wattmeter T1 Current transformer D1 Rectifier diode D2 Rectifier diode C1 Smoothing capacitor R1 Voltage detection resistor M1 First memory M2 Second memory

Claims (4)

[Claims] 1. A primary winding of a current transformer is connected in series to an AC line, a voltage proportional to a current waveform flowing through the AC line is detected as a secondary winding voltage, rectified by a rectifier diode, and rectified by a smoothing capacitor. A power consumption display characterized by smoothing to a voltage, inputting it to an A / D port of a microcomputer, and displaying a value proportional to an instantaneous value of power consumption on the on-screen display (hereinafter referred to as OSD) by the microcomputer. apparatus. 2. A primary winding of a current transformer is connected in series to an AC line, a voltage proportional to a current waveform flowing through the AC line is detected as a secondary winding voltage, rectified by a rectifier diode, and rectified by a smoothing capacitor. The voltage is smoothed, an average voltage is obtained by a filter circuit having a certain time constant, input to the A / D port of the microcomputer, and the microcomputer calculates a value proportional to the average value of the power consumption and displays the OSD. A power consumption display device characterized by the above-mentioned. 3. A primary winding of a current transformer is connected in series to an AC line, a voltage proportional to a current waveform flowing through the AC line is detected as a secondary winding voltage, rectified by a rectifier diode, and rectified by a smoothing capacitor. After smoothing the voltage, input it to the A / D port of the microcomputer, measure the accurate power with a wattmeter, store the value in the first memory, and control the level conversion circuit with the microcomputer to reduce the power consumption. A power consumption display device, which calculates and displays an OSD. 4. A primary winding of a current transformer is connected in series to an AC line, a voltage proportional to a current waveform flowing through the AC line is detected as a secondary winding voltage, rectified by a rectifier diode, and rectified by a smoothing capacitor. The voltage is smoothed, input to the A / D port of the microcomputer, the power is measured by the wattmeter, stored in the first memory, and the power consumption is calculated by controlling the level conversion circuit by the microcomputer. The second memory stores the time during which the television receiver is receiving an image, multiplies the average value of power consumption by the image receiving time of the television receiver, calculates integrated power, and displays the OSD. Power consumption display device.