JP4267164B2 - Wireless transmitter using battery as power source - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio transmitter that can be suitably used for a radio wave remote control device, and more particularly to a radio transmitter using a battery as a power source.
[0002]
[Prior art]
For example, for a remote control device that remotely controls opening / closing of a door (eg, shutter) and start / stop of a mechanical device, a radio remote control that transmits a command signal to the controlled mechanical device using radio waves Devices, light beam remote control devices that transmit using light such as infrared light, and ultrasonic remote control devices that transmit using ultrasonic waves are known. Among these, the radio remote control device is advantageous in that the command signal can be transmitted over a relatively long distance range because it is less affected by the shielding and the like than other wireless remote control devices.
[0003]
In a radio remote control device, an amplitude modulation method and a frequency modulation method are known as methods for transmitting a command signal to a mechanical device to be controlled. Generally, a command signal and a reference signal (carrier signal) having different frequencies are used. A frequency modulation method is widely used in which a modulation signal combined with (modulates a reference signal) is transmitted to a mechanical device to be controlled.
[0004]
FIG. 4 of the accompanying drawings is a block diagram showing the overall configuration of a typical conventional frequency modulation type radio transmitter.
A constant voltage device (also referred to as a power supply regulator or voltage regulator) 2a connected to the power supply unit 1 via a switch 3 so as to be able to be turned on / off adjusts a current generated in the power supply unit to a constant voltage, Supply to the transmitter 8. Further, the constant voltage device 2b always connected to the power supply unit 1 adjusts the voltage of the current generated in the power supply unit to a constant voltage and supplies it to the arithmetic processing unit 6b including the controller 4 and the memory 5. .
[0005]
The controller 4 controls on / off of the switch 3 so that the switch 3 is turned on when an external switch (not shown) is pressed. When the switch 3 is turned on, a current adjusted to a constant voltage is supplied from the constant voltage device 2a to the transmitter 8, and the transmitter 8 transmits a reference signal. Next, the controller 4 outputs a digital signal from the output terminal of the arithmetic processing unit according to a digital signal output pattern recorded in the memory 5 and digitally encoded with the identification symbol of the machine to be controlled and the command signal. Output to the / A converter.
[0006]
The D / A converter 7 converts the digital signal into an analog signal and supplies the analog signal to the transmitter 8. The transmitter 8 combines the analog signal sent from the D / A converter and the reference signal, and outputs a modulated signal to the transmitting antenna 9. The transmitting antenna 9 receives the modulated signal and transmits a radio wave corresponding to the modulated signal.
[0007]
In the conventional wireless transmitter as shown in FIG. 4, the reference signal and the analog signal as the command signal are transmitted based on the current adjusted to a constant voltage by the constant voltage device. A stable modulation signal having amplitude intensity can be transmitted to the machine device to be controlled.
[0008]
On the other hand, the wireless transmitter used in the remote control device is preferably small in size and easy to carry, and preferably has a small number of parts from the viewpoint of manufacturing cost. However, since the conventional radio transmitter requires two constant voltage devices, there is a problem that it is difficult to reduce the shape of the device.
[0009]
As a method of reducing the shape of the wireless transmitter and reducing the number of components, a method of supplying a constant voltage current generated from the constant voltage device to the transmitter and the arithmetic processing device as one constant voltage device is considered. It is done. However, in this case, since current is always supplied to the transmitter, there is a problem in that the battery is consumed quickly, resulting in practical inconvenience.
[0010]
[Problems to be solved by the invention]
The present invention is a wireless transmitter using a battery as a power source, and can reduce the number of parts and transmit a stable modulation signal so as not to cause practical inconvenience such as expediting battery consumption. An object is to provide a wireless transmitter.
[0011]
[Means for Solving the Problems]
The present invention relates to a power supply unit comprising at least one battery; a constant voltage device connected to the power supply unit so as to be able to be turned on / off and supplying a constant voltage current to a transmitter; connected to the power supply unit and the constant voltage device A voltage measuring device for measuring the voltage of the power supply unit with reference to a voltage set to a constant voltage by the constant voltage device; a memory connected to the power supply unit and recording a plurality of sets of digital signal output patterns; Connect to the power supply unit, the voltage measuring instrument and the memory, and read out the digital signal pattern corresponding to the voltage of the power supply unit measured by the voltage measuring instrument from the plurality of sets of digital signal output patterns recorded in the memory. A controller for generating a digital signal; connected to the controller; a D / A converter for converting the digital signal generated by the controller into an analog signal; and connected to the D / A converter; Reference signal A transmitter that combines the analog signal sent from the D / A converter and the reference signal to output a modulated signal; receives the modulated signal from the transmitter and transmits a radio wave corresponding to the modulated signal There is a wireless transmitter using as a power source a battery formed of a transmitting antenna.
[0012]
In the wireless transmitter of the present invention, the voltage of the current supplied from the power supply unit is preferably in the range of 1.8 to 3.4V. Examples of the battery that can be suitably used for the power supply unit include, but are not limited to, a coin-type lithium primary battery.
[0013]
In the wireless transmitter of the present invention, it is preferable that the voltage measuring device, the controller, and the memory are built in one arithmetic processing unit. An example of an arithmetic processing apparatus that can be suitably used in the wireless transmitter of the present invention is μPD754244 manufactured by NEC Corporation, but is not limited thereto.
[0014]
In the wireless transmitter of the present invention, the frequency of the reference signal transmitted from the transmitter is preferably 426 MHz, and the frequency of the analog signal transmitted from the D / A converter is preferably 1200 Hz.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 of the accompanying drawings is a block diagram showing the overall configuration of an embodiment of a wireless transmitter of the present invention.
[0016]
The constant voltage device 2 connected to the power supply unit 1 through the switch 3 so as to be able to be turned on / off adjusts the voltage of the current generated in the power supply unit to a constant voltage (for example, 2V). The constant voltage current adjusted by the constant voltage device 2 is supplied to the transmitter 8 and the voltage measuring device 10 built in the arithmetic processing unit 6a. On the other hand, the voltage measuring device 10, the controller 4, and the memory 5 built in the arithmetic processing unit 6 a that is always connected to the power supply unit 1 have currents that are not adjusted to a certain voltage generated from the power supply unit. Have been supplied. The switch 3 is controlled to be turned on / off by the controller 4 as in the case of the wireless transmitter shown in FIG.
[0017]
The voltage measuring instrument 10 converts the current supplied from the constant voltage device 2 (adjusted to a constant voltage) and the current supplied from the power supply unit 1 (not adjusted to a constant voltage) into digital signals, respectively. Then, the voltage of the current supplied from the power supply unit 1 (that is, the voltage of the power supply unit) is measured. Then, the measured value is output to the controller 4.
[0018]
In the memory 5, a set of digital signal output patterns in which the identification number of the machine device to be controlled and the command signal are digitally encoded are recorded in six sets (levels 1 to 6) with varying amplitude intensity.
[0019]
The controller 4 reads out a set of digital signal patterns having an amplitude intensity corresponding to the voltage of the power supply section sent from the voltage measuring instrument from among the six sets of digital signal output patterns recorded in the memory, and D / A converter 7 to output. Thereby, the fluctuation | variation of the output of a digital signal by the change of the voltage of the electric current supplied to a controller can be suppressed.
[0020]
The D / A converter 7, the transmitter 8, and the transmitting antenna 9 are the same as those of the conventional wireless transmitter shown in FIG. Specifically, a ladder-type D / A converter (also referred to as a resistance ladder) that combines resistors can be used as the D / A converter. Further, the transmitter can use a Colpitts transmission circuit composed of one transistor and a crystal resonator.
[0021]
Next, a command signal transmission procedure in this embodiment will be described with reference to FIGS. 2 and 3 of the accompanying drawings. FIG. 2 is a flowchart showing a procedure up to command signal transmission according to the present invention, and FIG. 3 is a flowchart showing a procedure for the controller to read out a digital signal pattern corresponding to the voltage of the power supply unit.
[0022]
A transmission operation is started by pressing the external switch (S0). The controller 4 turns on the switch 3. As a result, the constant voltage device operates and current is supplied from the power supply unit 1 to the constant voltage device 2 (S1). The transmitter 8 supplied with the constant voltage generated by the constant voltage device transmits a reference signal (S2).
[0023]
The constant voltage current generated by the constant voltage device 2 is also supplied to the voltage measuring device 10. Then, the voltage measuring device 10 measures the voltage of the power supply unit based on the voltage value (S3). As shown in FIG. 3, the controller 4 determines whether or not the voltage of the power supply unit measured by the voltage measuring device 10 is higher than a voltage serving as a determination reference. The digital signal output pattern is read from the memory 5 (S4).
[0024]
A set of digital signal output patterns read from the memory by the controller 4 is converted from a digital signal to an analog signal by the D / A converter 7 (S5). The analog signal is sent to the transmitter, and the transmitter 8 combines the reference signal transmitted in S2 and the analog signal to output a modulation signal (S6). The transmitting antenna 9 receives the modulated signal, and transmits a radio wave corresponding to the modulated signal to the mechanical device to be controlled (S7).
[0025]
【The invention's effect】
The wireless transmitter using the battery of the present invention as a power source combines an analog signal (analog command signal) obtained by analogizing a digital signal output pattern (digital command signal) having an amplitude intensity corresponding to the voltage of the power supply unit with a reference signal. Therefore, a stable command signal can be transmitted. Therefore, the wireless transmitter of the present invention is preferably used as a command signal transmitter of a radio remote control device that remotely controls opening / closing of a door (eg, shutter) and starting / stopping of a mechanical device (eg, engine). can do. Further, in the wireless transmitter of the present invention, since there is only one constant voltage device, the number of parts is reduced and the size is reduced compared to the conventional wireless transmitter, and the manufacturing cost is industrially advantageous. Become.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an overall configuration of an embodiment of a wireless transmitter according to the present invention.
FIG. 2 is a flowchart showing a procedure up to command signal transmission in the wireless transmitter of the present invention.
FIG. 3 is a flowchart showing a procedure in which a controller in the wireless transmitter of the present invention reads a digital signal pattern corresponding to a voltage of a power supply unit.
FIG. 4 is a block diagram showing an overall configuration of a typical conventional wireless transmitter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Power supply part 2, 2a, 2b Constant voltage apparatus 3 Switch 4 Controller 5 Memory 6a, 6b Arithmetic processing apparatus 7 D / A converter 8 Transmitter 9 Antenna 10 Voltage measuring device

Claims (1)

A power supply unit comprising at least one battery; a constant voltage device connected to the power supply unit so as to be able to be turned on / off, and supplying a constant voltage current to the transmitter; connected to the power supply unit and the constant voltage device; A voltage measuring device for measuring a voltage of a power supply unit with reference to a voltage set to a constant voltage by a voltage device; a memory connected to the power supply unit and recording a plurality of sets of digital signal output patterns; the power supply unit; Connects to a voltage measuring instrument and the memory and reads a digital signal pattern corresponding to the voltage of the power supply unit measured by the voltage measuring instrument from a plurality of sets of digital signal output patterns recorded in the memory to generate a digital signal A controller that connects to the controller and converts a digital signal generated by the controller into an analog signal; and is connected to the D / A converter and transmits a reference signal do it, A transmitter that combines the analog signal sent from the D / A converter and the reference signal to output a modulated signal; from a transmitting antenna that receives the modulated signal from the transmitter and transmits a radio wave corresponding to the modulated signal A wireless transmitter using a configured battery as a power source.

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