JPH04185200A - Power supply on/off detection circuit for electric appliance - Google Patents

Abstract

PURPOSE:To detect power supply on/off comprising plural electric appliances with one circuit by detecting it that the electric appliance is turned on through the detection of increase in power outputted from a lighting line power supply output just after a power on/off remote control signal is outputted. CONSTITUTION:A microcomputer 7 sends a reset signal to a state storage circuit 6 to bring the circuit 6 to the initializing state and controls a remote control signal transmission circuit 8 to output a remote control signal to turn on/off an electric appliance 12. Then the output of the state storage circuit 6 is read and when the electric appliance 12 is changed to be turned on by the remote control signal sent from the remote control signal transmission circuit 8, since an output exists in a voltage increase detection circuit 5, the state of the state storage circuit 6 is changed and it is read by the microcomputer 7 to detect it that the power supply of the electric appliance 12 is turned on. Thus, it is not required to employ a detection circuit for one electric appliance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for turning on/off the power supply using a remote control device.
The power of F-enabled appliances can be turned ON/OFF by the remote control device.
Power ON/O of electrical appliances that can detect whether it is in the ON or OFF state by receiving the F signal.
This relates to an FF detection circuit.

Conventional technology In recent years, the power ON10FF detection circuit of electric appliances is
It is built into selector devices, TV tuner devices, etc., and detects the voltage of 10FF when the power of external equipment is turned off. , change channels, perform automatic recording, automatic playback, etc.

An example of the above-mentioned conventional power ON/OFF detection circuit for electric appliances will be described below with reference to the drawings.

FIG. 3 shows the configuration of a conventional ON/OFF detection circuit for an electric appliance. In FIG. 3, 41 is a current detection circuit, 42 is a rectifier circuit, 43 is a smoothing circuit, 44 is a comparator, 45 is a reference voltage, 46 is a microcomputer, 47 is a power line power input, 48 is a power line power output, 49
5 is a conventional electric appliance power ON/OFF detection circuit, and 50 is an electric appliance.

The power line power source 47 takes in the power line power and outputs it from the power line power output 48. The current detection circuit 41 detects the current of the light line power output from the power line power output 48, converts it into an AC signal, and outputs it. The rectifier circuit 42 rectifies the output AC signal of the current detection circuit 41, converts it to a DC signal, and outputs it. The smoothing circuit 43 smoothes the output DC signal of the rectifier circuit 42 and converts it to DC signal with little level change. 44 compares the output of the smoothing circuit 43 with a reference voltage 45 and outputs it.A microcomputer 46 takes in the output of the comparator 44.The electric appliance 50 is operated by the output power of the power line power output 48.

The operation of the electric appliance power ON/OFF detection circuit configured as described above will be described below.

The power line power source 47 takes in the power line power and outputs it from the power line power output 48. The current detection circuit 41 detects the current of the light line power output from the power line power output 48, converts it into an AC signal, and outputs it. The rectifier circuit 42 rectifies the output AC signal of the current detection circuit 41, converts it into a DC signal, and outputs it.The smoothing circuit 43 smoothes the output DC signal of the rectifier circuit 42 and converts it into a DC signal with little level change. This DC signal is proportional to the alternating current output from the power line power output. The comparator 44 compares the output of the smoothing circuit 43 with the reference voltage 45, so that the output of the comparator 44 is output from the power line power output 48. It will output whether the current is larger or smaller than a certain value,
The microcomputer 46 takes in the output of the comparator 44, and uses this signal to determine whether the electrical appliance connected to the power line power output 48 is in the ON or OFF state.

Problems to be Solved by the Invention However, with the above configuration, if the power consumption of the appliance is large when the main power is turned off, the absolute value of the power consumption is detected, so if it is larger than a certain value, For example, there are problems in which the main power is incorrectly detected as ON even when the main power is OFF, and when multiple electrical appliances are turned ON.
When detecting /OFF, there was a problem in that it was necessary to prepare a detection circuit for each electric appliance.

In view of the above-mentioned problems, the present invention prevents erroneous detection that the main power is ON even if the power consumption when the main power of an electric appliance is OFF is high, and even when the power of multiple electric appliances is turned ON.
The present invention provides a power ON/OFF detection circuit for electrical appliances that can detect FF with one circuit.

Means for Solving the Problems In order to solve the above-mentioned problems, the power source O for the electric appliance of the present invention
The N/OFF detection circuit includes a power line power input that takes in power from the power line, a power line power output that outputs the light line power that is taken in by the power line input, and a power line power output that outputs the power that is output from the power line power output. a current detection circuit that detects the current of power line power, converts it into an AC signal, and outputs it; a rectifier circuit that rectifies the AC signal detected by the current detection circuit and converts it into a DC signal; a smoothing circuit that smooths level changes in the frequency components of the power line power source included in the DC signal obtained by the DC signal and converts them into direct current with less level changes, and a DC power line power source with less level changes obtained by the smoothing circuit. A differentiating circuit extracts the level change of the frequency component lower than the frequency of
a voltage rise (fall) detection circuit that detects and outputs a value greater than a certain value, and a voltage rise (fall) detection circuit that is initialized by a reset pulse from the microcomputer and set by the output of the voltage rise (fall) detection circuit. a state memory circuit that outputs whether or not the output of the voltage rise (fall) detection circuit has been input during the period from when the microcomputer inputs the set signal manually until the microcomputer reads the output; ,
The microcomputer supplies a reset signal to the state storage circuit, inputs the output signal of the output circuit of the state storage circuit, and further outputs a signal to be transmitted to the remote control signal transmission circuit, and according to the signal from the microcomputer, The remote control signal transmitting circuit outputs a remote control signal.

Effect of the Invention With the above-described configuration, the present invention detects a change in the current of the power line power output from the power line power output immediately after transmitting the power ON/OFF signal from the remote control signal transmission circuit.

(1) A current that detects that the electrical appliance connected to the power line power output is turned on when the detected current changes or increases in its absolute value or is larger than a certain value. Since it detects the amount of change in power, even if an appliance consumes a large amount of power during standby, it will not be mistakenly detected as being turned on, and it will also be possible to turn on multiple appliances.
Even when detecting 8, it is possible to perform the detection with one detection circuit by connecting them in parallel.

(2) Also, if the detected change in current is decreasing and its absolute value is larger than a certain value, it is detected that the electric appliance connected to the power line power output is turned off. . Since changes in current are detected, even appliances that consume a lot of power during standby can be turned on.
Therefore, there will be no false detection, and even when detecting the power off of multiple electric appliances, by connecting them in parallel, it can be detected with one detection circuit.

Example Below, power ON/OFF of an electric appliance according to an example of the present invention
The detection circuit will be explained with reference to the drawings. 1st
The figure shows the first embodiment of the present invention when the electric appliance is powered on.
1 shows a configuration diagram of a /OFF detection circuit.

In Fig. 1, 1 is a current detection circuit, 2 is a rectifier circuit, and 3 is a current detection circuit.
is a smoothing circuit, 4 is a differentiation circuit, 5 is a voltage rise detection circuit, 6
1 is a state storage circuit, 7 is a microcomputer, 8 is a remote control signal transmission circuit, 9 is a power line power input, 10 is a power line output, 11 is an electric appliance power ON/OFF detection circuit, and 12 is an electric appliance.

The operation of the electric appliance power ON/OFF detection circuit configured as described above will be described below.

Current detection circuit 1 has power line power source 9 and power line power output 1
0, detects the current that enters from the power line power source 9 and outputs it as an AC voltage signal, and outputs it as an AC voltage signal.The current detection circuit can use a current transformer or a resistor. 2 is a rectifier circuit 2 that rectifies the output AC voltage signal of the current detection circuit 1 and converts it into a DC signal.
An absolute value circuit using a diode rectifier or an operational amplifier can be used as the smoothing circuit 3.The smoothing circuit 3 smoothes the output DC signal of the rectifier circuit 2 to make it a DC signal with little level change.As the smoothing circuit 3, a low-pass filter is used. The cutoff frequency is set at around 10 Hz to remove components higher than the power line power frequency and to respond quickly to changes in the average value of the output DC signal of the rectifier circuit 2. A bypass filter is used as the differentiating circuit 4, and its cutoff frequency is output as soon as there is no level change in the output of the smoothing circuit 3. Approximately I Hz
The voltage rise detection circuit 5, which is set nearby, determines that the power has been turned on when the absolute value of the output N pressure of the differentiating circuit 4 is larger than the set value, and the output is a positive value, and outputs the output. issue. The microcomputer 7 first sends a reset signal to the state storage circuit 6 to set it to the initial state, and then controls the remote control signal transmission circuit 8 to turn the electric appliance 12 ON10.
A remote control signal transmitting circuit 8 outputs a remote control signal for F F, and then reads the output of the state storage circuit 6.
The electric appliance 12 is turned on by the remote control signal sent from
When the state changes to N, the voltage rise detection circuit 5 has an output, so the state of the state memory circuit 6 changes and the microcomputer 7 reads it, thereby indicating that the electric appliance 12 is in the power-on state. Can be detected.

Another embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, 21 is a current detection circuit, 22 is a rectifier circuit, 23 is a smoothing circuit, 24 is a differentiation circuit, 25 is a voltage rise detection circuit, 26 is a state storage circuit, 27 is a microcomputer, and 28 is a remote control signal transmission circuit. , 29 is the power line power input, 30 is the power line output, 31 is the power supply O for electrical appliances.
N/OFF detection circuit 32 is an electric appliance.

The operation of the electric appliance power ON/OFF detection circuit configured as described above will be described below.

The current detection circuit 21 enters between the power line power source 29 and the power line power output 30, detects the current input from the power line power source 29 and output from the power line power output, and outputs it as an AC voltage signal. A current transformer or a resistor can be used as the circuit.The rectifier circuit 22 rectifies the output AC voltage signal of the current detection circuit 21 and converts it into a DC signal.As the rectifier circuit 22, a diode rectifier or an operational amplifier is used to convert the absolute value. The smoothing circuit 23 smoothes the output DC signal of the rectifier circuit 22 to make it a DC signal with little level change.A low-pass filter is used as the smoothing circuit 23, and its cutoff frequency is higher than the power line frequency. approximately 10Hz to remove components and respond quickly to changes in the average value of the output DC signal of the rectifier circuit 22.
The differentiating circuit 24 is set near the smoothing circuit 23, and extracts the slow level change component of the DC signal with little level change.The differentiating circuit 24 uses a bypass filter, and its cant-off frequency is set to the smoothing circuit 23. The voltage drop detection circuit 25, which is set to around IHz so that the output disappears quickly when the level change in the output of , and if the output is a negative value, it is determined that the power is turned off, and the output is output. The microcomputer 27 first sends a reset signal to the state memory circuit 26 to set it to the initial state, then controls the remote control signal transmitting circuit 28 to output a remote control signal that turns the electric appliance 32 ○N10FF, and then the state memory circuit 2
When the electric appliance 32 changes to the OFF state by the remote control signal transmitted from the remote control signal transmission circuit 28, the state of the state storage circuit 26 changes because there is an output to the voltage drop detection circuit 25. By reading this with the microcomputer 7, it is possible to detect whether the electric appliance 32 is in a power-off state.

Effects of the Invention As described above, the present invention detects the change in the current value output from the power line power output after transmitting the power ON10FF signal from the remote control signal transmitting circuit, thereby controlling the main power supply of the electrical appliance. If the power consumption when OFF is large, the problem is that the main power is incorrectly detected as ON even if the main power is OFF, and the problem of turning on multiple electrical appliances
When detecting FF, it is possible to solve the problem that it is necessary to use a detection circuit for each electric appliance.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a power supply ON/OFF detection circuit in one embodiment of the present invention, Fig. 2 is a block diagram of a power supply 0N10 FF detection circuit in another embodiment of the present invention, and Fig. 3 is a block diagram of a power supply ON/OFF detection circuit in another embodiment of the present invention. FIG. 3 is a configuration diagram of an ON/OFF detection circuit. 1... Current detection circuit, 2... Rectifier circuit, 3... Engineering circuit, 4... Differential circuit,
5...Voltage rise detection circuit, 6...State memory circuit, 7...Micro-Ninoview evening, 8.
...Remote control signal transmission circuit, 9...Light line power input, 10...Light line power output, 11...
...Power ON/OFF detection circuit, 12...Electrical appliance. Name of agent: Patent attorney Haruaki Ogata and 2 others 9 -
J > go ν back 1 note t yasu power figure 2 figure 113

Claims (2)

[Claims] (1) A light line power input that takes in power line power from the power line, a power line power output that outputs the light line power taken in by the power line power input, and a power line power output from the power line power output. a current detection circuit that detects a current, converts it into an AC signal, and outputs it; a rectifier circuit that rectifies the AC signal detected by the current detection circuit and converts it into a DC signal; and a DC signal obtained by the rectification circuit. a smoothing circuit that smooths level changes in the frequency components of the power line power source included in the power line power source and converts them into direct current with less level changes; A differentiating circuit that extracts level changes of low frequency components; and detects and outputs that the level change of frequency components lower than the frequency of the power line power source obtained by the differentiating circuit is a positive value and is larger than a certain value. and a voltage rise detection circuit that is initialized by a reset pulse from the microcomputer or set by the output of the voltage rise detection circuit, so that the microcomputer is activated after a reset signal of the microcomputer is input. A state memory circuit that outputs whether or not the output of the voltage rise detection circuit has been input before reading the output, and a remote control signal transmission circuit that outputs a remote control signal in accordance with a signal from the microcomputer. , Turn on the power to the electrical equipment connected to the power line power output.
The electric appliance is characterized in that it is detected that the electric appliance is turned on by detecting that the electric power output from the power line power output increases immediately after outputting the /OFF remote control signal. Power ON/OFF of equipment
detection circuit. (2) Power supply O to the electrical equipment connected to the power line power output
It is characterized in that it is detected that the electric appliance has entered the OFF state by detecting that the electric power output from the power line power output decreases immediately after outputting the N/OFF remote control signal. A power ON/OFF detection circuit for an electric appliance according to claim 1.