JPH056912U - Position detection control circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] Using the normal A / D converter as it is, the matching adjustment accuracy is high, especially when the frequency is high.
Provided is a cost-effective position detection control circuit. [Structure] When the output voltage from the position data detector can be limited to 1 / M of the maximum voltage, the output voltage of the position data from the position data detector is amplified M times by a voltage amplifier, and A / D The part exceeding the allowable input voltage value of the converter is cut by the limiter, digitally encoded by the A / D converter, the error with the desired position data is discriminated by the error discriminator, and the drive circuit operates based on this error. The position detection control circuit controls the position of the sliding terminal of the controlled variable element.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a position detection control circuit of a controlled variable element used in a tuning / matching circuit of a shortwave transmitter or the like, or a tuning / matching circuit of an antenna matching device, and particularly, the use area of the controlled variable element is a partial area. In this case, the present invention relates to a position detection control circuit with improved position resolution.

[0002]

[Prior Art]

 From the perspective of the transmitter, the antenna is a load that consumes power, so it can be considered as a type of resistor. Therefore, in order to send the output of the transmitter to the antenna efficiently, or to send the input from the antenna to the transmitter efficiently, it is necessary to match the antenna coupling part between the power amplifier of the transmitter and the antenna. There is.

A conventional tuning / matching circuit of the antenna coupling section will be described with reference to the circuit diagram of the antenna coupling section of the transmitter using the grounded antenna in FIG. The conventional tuning / matching circuit of the antenna coupling section is configured so that one or both of the coil and the capacitor can be variably set to an arbitrary output. In such a tuning / matching circuit of the antenna coupling part, by adjusting the variable coil or the variable capacitor, the current flowing through the antenna 11 side and the current flowing through the transmitter 12 side are tuned to each other, and the antenna 11 and the transmitter 11 are transmitted. The control is performed so that input / output with the machine 12 can be efficiently performed.

Then, a conventional position detection control circuit for optimally positioning a controlled variable element such as a variable coil and a variable capacitor used in the tuning / matching circuit will be described with reference to FIG.

FIG. 4 is a block diagram of a conventional position detection control circuit, in which a variable coil is used as a controlled variable element. In the conventional position detection control circuit, the controlled variable element 1 having a sliding terminal that moves in the variable region and the continuously variable resistor with a DC voltage of 5 V applied to both ends are linked to the sliding terminal of the controlled variable element 1. Then, the sliding terminal is moved, and the position data detector 2 that outputs the position data of the controlled variable element 1 as a voltage, and the A / D converter 3 that digitally encodes the voltage from the position data detector 2 , An error discriminator 4 for discriminating an error between the digitally encoded position data of the controlled variable element 1 and the desired position data set in the desired position data generator 5, and the error discriminator 4 of the controlled variable element 1 due to this error. It is composed of a drive circuit 6 for controlling the sliding terminal position.

Next, the operation of the position detection control circuit will be described. When the position of the sliding terminal on the controlled variable element 1 is determined, the position of the sliding terminal of the position data detector 2 is linked with it. It is determined and digitally encoded by the A / D converter 3 as a position data detection voltage signal of the controlled variable element 1. Then, the value set in advance by the desired position data generator 5 and the output value from the A / D converter 3 are compared by the error discriminator 4, and the controlled variable element 1 is controlled by the drive circuit 6 so as to eliminate the difference. It was designed to control the position of the sliding terminal.

When this position detection control circuit is used, for example, as a short-wave matching circuit having a transmission frequency in the range of 2 to 30 MHz, the inductance is large when the frequency is around 2 MHz (at low frequency). On the other hand, when the frequency is in the vicinity of 30 MHz (at high frequency), the adjustment is made in the part having a small inductance to obtain the matching, while the adjustment is made in the part to obtain the matching. Therefore, in such a case, the adjustment accuracy of the coil needs to be higher when the frequency is 30 MHz than when it is 2 MHz.

[0008]

[Problems to be solved by the device]

 However, in the above-mentioned conventional position detection control circuit, the adjustment accuracy of the coil depends on the performance of the A / D converter, and in order to improve the accuracy, an A / D converter with a large number of bits must be used and it is expensive. There was a problem that it would be something.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a position detection control circuit with higher accuracy by using a general A / D converter as it is.

[0010]

[Means for Solving the Problems]

 The present invention for solving the above-mentioned problems of the conventional example is directed to a controlled variable element having a sliding terminal that moves in a variable region, and a sliding terminal in the controlled variable element that is interlocked with the sliding terminal. The position data detector for outputting the position data as a voltage, the A / D converter for digitally encoding the voltage output from the position data detector, the digitally encoded position data and the sliding terminal. A position detection control circuit having an error discriminator for discriminating an error from a desired position data set at a desired position, and a drive circuit for controlling the position of a sliding terminal in the controlled variable element by the error. A voltage amplifier for amplifying the voltage output from the position data detector and a limiter for limiting the voltage within the allowable input voltage value of the A / D converter are provided.

[0011]

[Action]

 According to the present invention, the position data from the position data detector is amplified by the voltage amplifier, and the voltage value of the increased position data is limited by the limiter so as not to exceed the allowable input voltage value of the A / D converter. The A / D converter performs digital encoding, and the error discriminator determines the error between the digitally encoded position data and the desired position data to drive the drive circuit. Since it is a position detection control circuit that controls the position, it is possible to use the general A / D converter as it is and improve the positioning accuracy of the controlled variable element. You can

[0012]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a position detection control circuit according to an embodiment of the present invention. It should be noted that parts having the same configurations as those in FIG.

The position detection control circuit according to the present embodiment includes a controlled variable element 1 having a sliding terminal that moves in a variable region and a continuously variable resistor having a DC voltage of 5 V applied to both ends of the controlled variable element 1. The sliding terminal moves in conjunction with the sliding terminal and outputs the position data of the controlled variable element 1 as a voltage, and the voltage from the position data detector 2 is digitally encoded A / The D converter 3, an error discriminator 4 for discriminating an error between the digitally encoded position data of the controlled variable element 1 and the desired position data preset in the desired position data generator 5; And a drive circuit 6 for controlling the position of the sliding terminal of the controllable element 1. In addition to this, a voltage amplifier for amplifying the voltage of the position data between the position data detector 2 and the A / D converter 3. 7 and A / D converter 3 A limiter 8 for limiting the allowable range is provided.

In this embodiment, a variable coil is used for the controlled variable element 1, and a continuous variable resistor that works with a sliding terminal of the controlled variable element 1 is used for the position data detector 2. The A / D converter 3 is a normal N-bit A / D converter having a resolution of 2 ^N.

The voltage amplifier 7 of this embodiment is an amplifier having a voltage gain of M times (M is a positive number of 1 or more) and amplifies the output voltage of the position data detector 2 by M times. .. Further, the limiter 8 cuts the output voltage amplified by the voltage amplifier 7 when it exceeds the allowable input voltage value of the A / D converter 3, and the output from the voltage amplifier 7 is always output from the A / D converter. The allowable input voltage value of 3 is restricted so as not to exceed the value.

Further, the desired position data generator 5 holds the desired position data with M times accuracy in the range of 1 to 1 / M, and gives the desired position data to the error discriminator 4. The error discriminator 4 compares the digitally encoded position data from the A / D converter 3 with the desired position data from the desired position data generator 5 to determine the error, and the drive circuit 6 operates the sliding terminal of the controlled variable element 1 according to the error data given from the error discriminator 4.

FIG. 2 is a transition diagram of voltage values from the position data detector 2 to the A / D converter 3 of this embodiment. Let the maximum allowable input voltage (Max) of the A / D converter 3 be Va, the output DC voltage obtained from the sliding terminal of the position data detector 2 be Vr, and the voltage amplified by the voltage amplifier 7 be Vr '. Here, the output voltage Vr of the position data detector 2 is amplified M times by the voltage amplifier 7, and the amplified voltage Vr ′ becomes Vr ′ = M · Vr and is input to the limiter 8. If the amplified voltage Vr ′ is Vr ′ ≦ Va, that is, Vr ≦ Va / M with respect to the maximum allowable input voltage Va of the A / D converter 3, the input voltage to the A / D converter 3 is 0. Since it is in the range of to Va, digital encoding is possible.

Then, the error discriminator 4 discriminates an error between the data from the desired position data generator 5 having the desired position data with M times accuracy and the value digitally encoded by the A / D converter 3. Then, the drive circuit 6 operates according to the result of the error determination to control the sliding terminal position of the controlled variable element 1.

According to the position detection control circuit of the present embodiment, the voltage amplifier 7 and the voltage amplifier 7 are provided in the range of 1 / M of the entire movable range of the sliding terminals of the position data detector 2, that is, when the frequency is high. By providing the limiter 8, the output voltage from the position data detector 2 is amplified M times by the voltage amplifier 7, and the part exceeding the allowable input voltage value of the A / D converter 3 is cut by the limiter 8. Since position control can be performed with a resolution of 2 ^N , which is the accuracy of the normal A / D converter 3, position detection can be performed with M times accuracy, and position control can be achieved with M times accuracy.

[0020]

[Effect of the device]

 According to the present invention, the position data from the position data detector is amplified by the voltage amplifier, and the voltage value of the increased position data is limited by the limiter so as not to exceed the allowable input voltage value of the A / D converter. The A / D converter performs digital encoding, and the error discriminator determines the error between the digitally encoded position data and the desired position data to drive the drive circuit. Since it is a position detection control circuit that controls the position, it is possible to use the general A / D converter as it is and improve the positioning accuracy of the controlled variable element. It has the effect of being able to

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a position detection control circuit of the present invention.

FIG. 2 is a transition diagram of voltage values from a continuously variable resistor to an A / D converter of the present invention.

FIG. 3 is a circuit diagram of an antenna coupling unit of a transceiver.

FIG. 4 is a block diagram showing a configuration of a conventional position detection control circuit.

[Explanation of symbols]

1 ... Controlled variable element, 2 ... Position data detector, 3 ...
A / D converter, 4 ... Error discriminator, 5 ... Desired position data generator, 6 ... Driving circuit, 7 ... Voltage amplifier, 8 ... Limiter, 11 ... Antenna, 12 ... Transmitter

Claims (1)

Claims for utility model registration: Claim 1. A controlled variable element having a sliding terminal that moves in a variable region, and position data of a sliding terminal in the controlled variable element linked to the sliding terminal. Position data detector for outputting as a voltage, an A / D converter for digitally encoding the voltage output from the position data detector, the digitally encoded position data and the desired position for the sliding terminal. In the position detection control circuit having an error discriminator that discriminates an error from the desired position data to be set to, and a drive circuit that controls the position of the sliding terminal in the controlled variable element by the error, A position detection control circuit comprising: a voltage amplifier for amplifying a voltage output from a detector; and a limiter for limiting the voltage within an allowable input voltage value of the A / D converter.