JPH0619353Y2 - Radio control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a transmitter for transmitting a drive pulse having a duty ratio corresponding to a tilt angle of a stick lever to a device to be remotely controlled, and a remote control of the drive pulse. The present invention relates to a radio control system including a control amplifier that supplies a motor of a device described above.

(b) Conventional technology and its drawbacks For model cars of motor drive, etc., the voltage supplied to the drive motor is turned on by a control amplifier at a cycle of several tens of ms.
There is one in which the speed is controlled by changing the ratio (duty ratio) occupied by the off time and the on time. In this method, for example, when one cycle is 20 ms, the voltage ON time is 10 ms for each cycle when the output is controlled to 50% (duty ratio 50%), and the voltage is not applied when the output is 0. It remains off (duty ratio 0%). Further, when the output is fully opened, the voltage remains on (duty ratio 10
0 percent).

In the case of wireless remote control (radio control: hereinafter referred to as "radio control") for speed control of a model car or the like having the above configuration, a proportional system is usually adopted. In this method, in the radio control system shown in FIG. 4, if the operator operates the stick lever 33 attached to the transmitter 32 and tilts the stick, the output proportional to the tilt angle is output to a remote model car or the like. In the operated device 34, a control signal is transmitted so that the control amplifier 2 controls the motor 3.

The motor output changes between 0 and 100% by operating the stick lever of the transmitter, but the control signal output depending on the tilt of the stick lever varies from transmitter to transmitter, making it easy for the operator to operate the stick. Since the setting positions of the levers are different, it is possible to arbitrarily adjust how much the stick lever should be tilted and how much the motor output should be, so that each person can set a preferable position. Generally, the operability will be best if the motor output is adjusted to be fully opened (duty ratio 100%) when the stick lever is tilted about 3/4 of the full tilt angle.

At the time of the above adjustment, conventionally, there is no suitable method for determining the motor output, and the person performing the adjustment needs to be trained because the adjustment is made by the so-called intuition in which the person who makes the adjustment hears and makes the determination. In addition, it is impossible to accurately determine the motor output from the motor sound, and accurate adjustment cannot be performed.

(c) Purpose of the Invention In view of the above-mentioned drawbacks, the invention has a simple structure and can clearly recognize that the motor output of a remotely controlled device has reached a specific value. It is an object of the present invention to provide a radio control system capable of accurately and easily adjusting the relationship between the inclination angle of the motor and the motor output.

(d) Configuration and Effect of the Invention This invention is provided with a stick lever that tilts within a predetermined angle range, and a transmitter that transmits a drive pulse having a duty ratio according to the tilt angle of the stick lever to a device that is remotely controlled. The control unit that supplies the drive pulse transmitted from the transmitter to the motor of the remotely controlled device via the power transistor, the capacitor that is charged when the drive pulse is turned on and discharged when the drive pulse is turned off, and the voltage between the terminals of the capacitor is the drive pulse. A control amplifier provided with a driving transistor which is turned on when a voltage corresponding to the duty ratio of 100% is exceeded, and a checker including a display to which a voltage is applied via the driving transistor, and It is characterized by being configured.

According to the present invention, which is configured as described above,
If you operate the stick lever of the transmitter to tilt it and gradually increase the duty ratio of the drive pulse supplied from the control amplifier to the motor, the rotation speed of the motor will gradually increase and the drive pulse will be supplied. The voltage across the terminals of the receiving capacitor also gradually rises. Then, when the duty ratio of the drive pulse reaches 100%, the rotation speed of the motor becomes maximum, the voltage between the terminals of the capacitor reaches the on-voltage of the drive transistor, and the drive transistor turns on to turn on the display. A voltage is applied to. Therefore, it is possible to easily judge that the motor output has reached the maximum from both the rotation sound of the motor and the lighting state of the display, and the relationship between the operating state of the stick lever of the transmitter and the rotating state of the motor can be easily determined. There is an advantage that the setting work can be performed extremely easily.

(e) Embodiment FIG. 3 is a block diagram showing a drive control unit including a control amplifier which constitutes the radio control system shown in FIG.

The control amplifier 2 includes a control IC 20 and a control I 20 which supply a drive pulse to the motor 3.
In addition to the power FET 21 that connects C20 to the motor 3, the checker 1 that detects that the duty ratio of the drive pulse has reached 100% is provided.
The power FET 21 is turned on / off by the drive pulse output from the control IC 20, and when the power FET 21 is turned on, a voltage is applied to the motor 3 from the battery 4, and the motor 3 rotates at a rotation speed according to the duty ratio of the drive pulse. The drive pulse output from the control IC 20 is also supplied to the A terminal of the checker 1. The B terminal of the checker 1 is connected to the ground line.

An example of the drive pulse voltage waveform supplied to the motor is shown in the upper part of FIG. In this example, the duty ratio is 60%. That is, the voltage is applied from the battery 4 to the motor 3 within 12 ms of the cycle of 20 ms. The output of the motor 3 is adjusted by advancing the timing T2 of the voltage fall between T1 and T3. T2 is T3
The motor output rises when approaching to, and when T2 matches T3, the output becomes maximum and continues to be turned on. Also, T2
When T2 approaches T1, the motor output decreases, and when T2 matches T1, the output is minimized and continues to be turned off.

FIG. 1 is a circuit diagram of the checker. In the checker 1, the A terminal connected to the controller IC 20 has a duty ratio detecting transistor Q1 and an LED.
The emitter of the driving transistor Q2 is connected, and the collectors of the transistors Q1 and Q2 are connected to the B terminal connected to the ground line. Therefore, the transistor Q
1 and Q2 operate using the voltage supplied from the A and B terminals as a power source. Further, one terminal of the capacitor C is connected to the B terminal, and the other terminal of the capacitor C is connected to the A terminal via the resistor R1 and the diode D which are connected in parallel.

The voltage between the terminals of the capacitor C is supplied to the base of the transistor Q1, and the output of the transistor Q1 is the transistor Q1.
Supplied to base of 2. The load on the transistor Q2 is
The LED and the resistor R4 for limiting the current. When the voltage of the drive pulse supplied from the controller IC 20 to the A terminal is turned on, the capacitor C is charged via the resistor R1, and when the voltage is turned off, the electric charge charged in the capacitor C is output from the diode D and the control amplifier 2. It is immediately discharged through the terminal. When the voltage across the terminals of the capacitor C becomes a certain value or more, the transistor Q1 is turned off, the transistor Q2 is turned on, and the LED is turned on.

If the electrostatic capacitance of the capacitor C and the resistance value of the resistor R1 are set as a mortgage, the voltage on time required for the LED to light up, that is, the time required for the voltage across the terminals of the capacitor C to reach a constant value, is set. It can be set arbitrarily. Normally, it is used to turn on when the duty ratio reaches 100%, so the required time is 20 ms.
The above is set.

The lower part of FIG. 2 shows the change in the terminal voltage of the capacitor C when the voltage illustrated in the upper part is output. The capacitor C and the resistor R1 are set to turn on the LED when the voltage output reaches 100%. When the voltage is applied, the charging of the capacitor C is started and the voltage between the terminals rises. The electric charge charged when the voltage application is completed is immediately discharged through the diode D, and the terminal voltage becomes 0V. If the voltage of this capacitor C is turned off within 20 ms, the voltage across the terminals will change to the transistor Q1.
Because it discharges without increasing to a voltage that can turn off,
LED does not light. When the voltage is turned on continuously for 20 ms, the voltage between the terminals of the capacitor C exceeds the threshold voltage of the transistor Q1 as shown by the chain double-dashed line and the LED
Lights up.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a checker included in a control amplifier which constitutes a radio control system according to an embodiment of the present invention, and FIG. 2 shows a change in voltage waveform supplied to a motor and a voltage between terminals of a detection capacitor. FIG. 3 and FIG. 3 are block diagrams of the drive pass-through section including the control amplifier. FIG. 4 is a diagram showing a general radio control system including the embodiment of the present invention. 1 ... Checker 2 ... Control amplifier 3 ... Motor 32 ... Transmitter 33 ... Stick lever C ... Capacitor Q2 ... Driving transistor

Claims (1)

[Scope of utility model registration request] 1. A transmitter, comprising a stick lever tilting within a predetermined angle range, for transmitting a drive pulse having a duty ratio according to the tilt angle of the stick lever to a remotely controlled device, and a drive transmitted from the transmitter. A control unit that supplies a pulse to a motor of a device that is remotely controlled via a power transistor, a capacitor that is charged when a driving pulse is turned on, and discharged when the driving pulse is turned off. A control amplifier provided with a driving transistor that is turned on when a corresponding voltage is exceeded, and a checker including a display unit to which a voltage is applied via the driving transistor, and a control amplifier. Radio control system.