JP3520051B2 - High frequency type remote sensor controller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency remote sensor control device, and more particularly to a base unit for wirelessly outputting power source power, and a remote unit for performing various control operations with power source power wirelessly transmitted from the base unit. The present invention relates to a high-frequency remote sensor control device that has a section and stabilizes the power supply voltage in the remote section.

[0002]

2. Description of the Related Art For example, in an assembly line, parts and members are placed and attached to a moving container or tray to assemble a product, and the arrangement and attached parts or members are detected on the container or tray. When inspecting, the base unit wirelessly transmits power source power to these containers and trays as remote units to perform a predetermined control operation.

Conventionally, the high frequency type remote sensor control device used for this purpose has a structure as shown in FIG.

That is, a pulse signal of, for example, 20 KHz is oscillated by the fixed side base portion 1, and the pulse signal is electromagnetically used as a high frequency signal for power supply from a resonance circuit 3 which is made up of a coil L1 and a capacitor C1 and resonates at 20 KHz. In the remote part 5 (container or tray) on the movable side, the high frequency power supply signal electromagnetically transmitted from the base part 1 is resonated at 20 KHz by the coil L2 and the capacitor C2. The induced high frequency signal for power supply is rectified and smoothed and used as a drive power supply.

The remote unit 5 drives the light emitting diodes D1 to Dn to emit light when a component or member is detected by the switches SW1, SW2, ... Make the arm move mechanically.

The remote unit 5 oscillates a high-frequency signal of, for example, 3 MHz, compares the transmitted power supply voltage with a predetermined reference voltage, and increases the transmission power when the power supply voltage is lower than the reference voltage. Positive fixed constant (+
1) Data is output, and conversely, when the power supply voltage is higher than the reference voltage, negative fixed constant (-1) data that reduces the transmission power is output.
The resonance high frequency signal of MHz is modulated, and the modulated high frequency signal is electromagnetically emitted to the outside from the resonance circuit 9 which is composed of the coil L3 and the capacitor C3 and resonates at 3 MHz, and the base section 1 transmits the modulated high frequency signal to the coil L4. Capacitor C
4 is induced in the resonance circuit 11 that resonates at 3 MHz and the above-mentioned fixed constant data is detected, and the level and frequency of the power supply high-frequency signal are varied based on this fixed constant data, and the drive power supply of the remote unit 5 is changed. I tried to stabilize it to a desirable level.

[0007]

However, in the high-frequency type remote sensor control device having the above-mentioned configuration, the power supply voltage in the remote section 5 is set in order to stabilize the driving power supply for the load fluctuation of the remote section 5. When the power supply voltage is higher than the reference voltage, the negative fixed constant (+1) data is formed, and when the power supply voltage is higher than the reference voltage, the negative fixed constant (-1) data is formed, and this is serially transmitted to the base unit 1 wirelessly. Since it is configured to be controlled by the system, the delay of the control system cannot be ignored.

Therefore, the control speed cannot catch up with the fluctuation of the driving power source due to the fluctuation of the load, and as a result, the hunting of the driving voltage occurs in the remote section 5, and it is difficult to converge the driving voltage to the target driving voltage.

Further, in the limit region where the base unit 1 and the remote unit 5 approach each other from a distant state or move away from the near state, a transmission power gain transmitted from the base unit 1 to the remote unit 5 is maximum. There is a concern that the remote unit 5 may become overvoltage.

Considering the durability of the equipment, the remote unit 5
Therefore, it is preferable to operate in a state in which the drive voltage does not reach the overvoltage state, and improvement is necessary.

In the remote section 5, the transmission power from the base section 1 may be finely variably controlled according to the deviation between the power supply voltage and the reference voltage.
Since it is necessary to wirelessly serially transmit the correction data corresponding to the deviation to the base unit 1, the control system is delayed and cannot be solved.

Moreover, the power source power level required to be transmitted from the base unit 1 to the remote unit 5 changes variously depending on the distance between them and the size of the load, so that appropriate correction data is wirelessly transmitted to the base unit 1. It was necessary to specially devise serial transmission with.

The present invention has been made under such circumstances, and an object of the present invention is to provide a high-frequency remote sensor control device which can easily stabilize the drive power of the remote unit wirelessly transmitted from the base unit. .

[0014]

In order to solve such a problem, a high frequency type remote sensor control device of the present invention has a base part for emitting a high frequency signal for a PWM power source having a predetermined duty ratio to the outside, and its PWM. And a remote unit that is electronically operated by a drive power source formed from a high-frequency signal for power source, and the remote unit determines a deviation between a measured value of the drive power source and a preset reference power source level. The first correction value is formed by multiplying the proportional gain, the deviation between the previous measurement value and the measurement value is multiplied by a predetermined differential gain to form the second correction value, and the first and second correction values are formed. The correction value of 2 is added and this is the previous control correction
It has a function of modulating a predetermined control high-frequency signal with a new control correction value added to the value and emitting it to the outside, while the base part receives the control high-frequency signal and detects the control correction value. It has a function of variably controlling the duty ratio based on the above.

Further, in the present invention, when the measured value of the driving power source exceeds a predetermined upper or lower limit value and becomes large or small, a deviation from the reference power source level is multiplied by a fixed correction value to control the control. It is preferable to form the remote unit so as to obtain a correction value and modulate the control high frequency signal.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the base portion 13 is
Schematically, it is formed by including an oscillation drive unit 15, a reception signal processing unit 17, and resonance circuits 19 and 21.

The remote unit 23 is roughly the resonance circuit 2
5, 27, a rectifying / smoothing unit 29, a load circuit 31, and a transmission signal processing unit 33.

The oscillation drive unit 15 of the base unit 13 supplies a high-frequency signal for power supply for supplying power to the remote unit 23, for example, as shown in FIGS.
It has a function of oscillating a WM high-frequency signal and varying the duty ratio of the PWM high-frequency signal based on a control signal S1 described later, and is connected to the resonance circuit 19.

The resonance circuit 19 comprises a coil L5 and a capacitor C5 connected in parallel, resonates at 20 KHz, and is driven by the high frequency signal for power supply.

The resonance circuit 21 is composed of a coil L6 and a capacitor C6 connected in parallel, and resonates with a control high frequency signal of 3 MHz which will be described later.
It is connected to the.

The reception signal processing section 17 shapes and smoothes the control high-frequency signal induced in the resonance circuit 21, detects the correction control signal transmitted from the remote section 23, and
It has a function of forming a control signal S1 according to the correction control signal and outputting the control signal S1 to the oscillation drive unit 15 and, if necessary, to the outside.

The reception signal processing unit 17, for example, when the correction control signal S1 requests the increase of the power source power transmitted from the base unit 13 to the remote unit 23, the high frequency power source for the PWM power source oscillated by the oscillation drive unit 15 is generated. The control signal S1 for increasing the duty ratio of the signal is formed and output.

FIG. 2B shows a high frequency signal for a power source whose duty ratio is larger than that in FIG.

The resonance circuit 25 of the remote section 23 is composed of a coil L7 and a capacitor C7, and is formed in parallel to resonate at 20 KHz of the power supply high frequency signal.
The high frequency signal for power source electromagnetically emitted from the resonance circuit 19 is induced, and is connected to the rectifying and smoothing circuit 29.

The rectifying / smoothing circuit 29 is, for example, the resonance circuit 25.
Rectifier diodes D3 and D4 connected in the forward direction from both ends of
And a choke coil CH having one end connected to the common cathode side of the diodes D3 and D4, and the other end of the choke coil CH is formed by the load circuit 3
Connected to 1.

Although not shown, the load circuit 31 includes, for example, a switch for detecting a component or a member, a light emitting diode for indicating this detection, and a load as a mechanical drive unit such as an arm. It contains a stabilizing circuit for supplying a stable power supply voltage to the load and a DC-DC converter that boosts the power supply voltage.

The transmission signal processing unit 33 has a function of oscillating a control high-frequency signal of, for example, 3 MHz, while measuring the power supply voltage from the rectifying / smoothing circuit 29, that is, the power supply voltage in the load circuit 31, at every predetermined timing cycle, It has a function of comparing the measured value with a predetermined reference voltage as a preset target value, forming a control correction value according to this deviation, and modulating the control high-frequency signal with this control correction value. It is connected to the circuit 27. Detailed functions of the transmission signal processing unit 33 will be described later.

The resonance circuit 27 is composed of a coil L8 and a capacitor C8 connected in parallel and resonates with a control high frequency signal of 3 MHz.

The transmission signal processing unit 33 forms a first correction value a by multiplying a value obtained by subtracting the reference power source level from the measured value of the driving power source by the predetermined proportional (P) gain to form the previous measured value. Is multiplied by a predetermined differential (D) gain to form a second correction value b, and the first and second correction values a and b are added to the previous correction value b. The new PWM value is added as the control correction value to the new PWM value, and the control high frequency signal is modulated by this new PWM value and output to the resonance circuit 27.

When the measured value of the driving power source is larger or smaller than the preset upper limit value or lower limit value, the transmission signal processing unit 33 subtracts the measured value of the driving power source from the reference power source level. On the other hand, a fixed correction value (constant) is multiplied to form a third correction value c.
Value to form a new PWM value as a control correction value,
It also has the function of modulating the control high-frequency signal.

In the transmission signal processing section 33, the comparison calculation between the measured values of the driving power source and the reference power source level and the multiplication of the proportional (P) or differential (D) gain are performed by converting the measured value of the driving power source into a digital value. The converted reference power level and proportional (P) or derivative (D) gains are compared, multiplied, and added to generate 6-bit or 8-bit first to third correction values a, b,
c and control correction values are formed, these 6-bit and 8-bit parallel control correction values are serially converted, and as shown in FIG. 2C, the control high-frequency signal is modulated.
Note that there is no relationship between the cycles of FIGS. 2A and 2B and C of FIG.

The transmission signal processing unit 33 is, specifically,
It is formed of a microcomputer having a U or a ROM storing an operation program of the CPU, a RAM storing digital input / output signals and calculation results, and an I / O serving as an input / output interface.

Next, the operation of the high frequency type remote sensor control device according to the present invention will be briefly described.

When the base unit 13 is powered on, the oscillation driving unit 15 of the base unit 13 oscillates a PWM high frequency signal (see FIG. 2A) having a predetermined initial duty ratio at 20 KHz as a power source high frequency signal, and The resonance circuit 19 is driven by the high frequency signal for the PWM power source and is emitted to the outside.

Initially, since the control high-frequency signal is not emitted from the remote unit 23, the received signal processing unit 17 does not operate at least based on the control high-frequency signal from the remote unit 23.

When the resonance circuit 25 of the remote section 23 is close to the resonance circuit 19 of the base section 13, a high-frequency signal for power supply of 20 KHz is induced in the resonance circuit 25 and is rectified and smoothed by the rectification and smoothing circuit 29 to be converted into a direct current. The power supply voltage is supplied to the load circuit 31.

The load circuit 31 detects a component or member, displays a detection result, or causes a mechanical operation of an arm or the like according to the power supply voltage.

The transmission signal processing unit 33 measures the driving power supply in the load circuit 31 at every predetermined timing cycle, and as shown in FIG. 3, for example, the measured value (a) or (b) is used as the reference power supply level (target). The value obtained by subtracting (value) is multiplied by a predetermined proportional (P) gain to form a first correction value a, and the measured value (c) of the previous time (t1) to the measured value (a) of the (t2) or The value obtained by subtracting (b) is multiplied by a predetermined differential (D) gain to form the second correction value b, and the value obtained by adding the first and second correction values a and b is set to (t)
The new PWM value at the time point (t2) is formed as a control correction value by adding to the PWM value of 1), and the control high frequency signal is modulated with this control correction value and output to the resonance circuit 27.

When the measured value (a) at the time point (t2) is subtracted from the measured value (c) at the previous time (t1), the subtracted value becomes a negative value, and the PWM value at the time point (t2) is a negative value. The second correction value b is included and functions as a brake for the increase of the PWM value, while the subtraction value when the measured value (c) at the previous time (t1) is larger than the measured value (a) at the time point (t2). Becomes a positive value, and the new PWM value at the time point (t2) includes the positive second correction value b.
It acts as a brake for decreasing values.

The operation of obtaining this control correction value is shown in a flow chart of FIG. 4, for example. This flowchart is executed every timing cycle described above.

That is, in step 100, it is judged whether or not the measured value of the driving voltage exceeds the upper limit value and is large. If the measured value does not reach the upper limit value and is small and NO, then step 1
At 01, it is determined whether or not the measured value is smaller than the lower limit value.

When the measured value is larger than the lower limit value and is NO, the value obtained by subtracting the measured value from the target value is multiplied by a predetermined proportional (P) gain in step 102 to form the first correction value a. Then, the process proceeds to step 103.

In step 103, a value obtained by subtracting the measured value from the previous measured value is multiplied by a predetermined integral (D) gain to form a second correction value b, and in the subsequent step 104, the previous (current) The first and second correction values a and b to the PWM value of
Is added to form a control correction value (new PWM value), and the process ends.

Step 100 and step 101 are YE
In the case of S, in step 105, a value obtained by subtracting the measured value from the target value is multiplied by a predetermined fixed constant (E) gain to form a third correction value c, and the process proceeds to step 106.

In step 106, the PW of the last time (t1)
The third correction value c is added to the M value to form the control correction value (new PWM value) at the time point (t2), and the process ends.

When the control high-frequency signal modulated by the control correction value is transmitted from the resonance circuit 27 of the remote section 23, the control high-frequency signal is induced in the resonance circuit 21 of the base section 13 to receive the received signal processing section. Added to 17.

In the reception signal processing unit 17, the control high frequency signal is rectified and smoothed to detect the control correction value, and the content of the control correction value, that is, the power supply voltage increase request or the power supply voltage decrease request is determined. The determination is made and the degree of change is detected, and the control signal S1 is formed according to the degree of increase or decrease of the power supply voltage and output to the oscillation drive unit 15 and the like.

In the oscillation drive section 15, if the control signal S1 is required to increase the power supply voltage, as shown in FIG. 2B, the PWM in which the duty ratio is increased according to the increase degree is used.
Variable high frequency signal is oscillated and transmitted to the remote unit 23 side,
If it is the control signal S1 that requests a decrease in the power supply voltage, a PWM high frequency signal with a reduced duty ratio is variably oscillated, although not shown.

As described above, in the high frequency type remote sensor control device of the present invention, the base section 13 electromagnetically emits the high frequency signal for the PWM power source having a predetermined duty ratio from the resonance circuit 19 to the outside, and the remote section 23, The remote control unit 23 operates by electromagnetically inducing and rectifying and smoothing the high-frequency signal for power supply to generate a power supply voltage, while the remote unit 23 subtracts a reference power supply level from the measured value of the drive power supply in a predetermined proportion ( P) The gain is multiplied to form the first correction value a, and the value obtained by subtracting the measurement value from the previous measurement value is multiplied by a predetermined differential (D) gain to form the second correction value b. ,
The first and second correction values a and b are added to the previous control correction value (previous PWM value) to form a new control correction value for the next time (new PWM value for the next time). With the function of modulating the signal and transmitting it to the outside, the base part changes the duty ratio of the high frequency signal for PWM power supply based on the control correction value (new PWM value) that is detected by receiving the high frequency signal for control. Configured to control.

Therefore, the PWM signal corresponding to the deviation between the measured value of the drive power supply and the reference power supply level can be obtained by the first correction value a, and the value inversely proportional to the change rate of the drive voltage by the second correction value b. Is added to the new PWM value.

For example, in the state where the drive voltage close to the reference power supply level should be obtained by the next new PWM value based on the first correction value a in the remote unit 23, the drive voltage becomes the reference voltage due to the delay of the system. The speed correction is added by the second correction value b to prevent the excessive movement, and the rapid change based on the next new PWM value is suppressed, and the remote unit 2
The drive voltage of 3 quickly converges to the reference voltage, and an oscillation state such as hunting hardly occurs.

Therefore, even if the drive voltage of the remote section 23 changes abruptly or greatly, the power supply is transmitted from the base section 13 so that the target value as the reference voltage can be quickly tracked, and the remote section 23 is driven. The drive voltage can be stabilized quickly.

Moreover, the transmission power gain transmitted from the base unit 13 to the remote unit 23 is the maximum even in the limit region where the base unit 1 and the remote unit 5 approach from a state far away from each other or move away from the state close to the distance. Difficult to become, remote part
It is difficult to put the battery in an overvoltage state.

Further, when the measured value of the driving power source exceeds the upper limit value or the lower limit value, a value obtained by subtracting the measured value of the driving power source from the reference voltage is multiplied by a fixed constant (E) gain to obtain a third value.
Correction value c is formed, and the third correction value c is set to the previous PW.
Since the control signal is added to the M value to form the control correction value (new PWM value), and the transmission signal processing unit 33 is formed so as to modulate the control high frequency signal, the measured value of the driving power supply is the upper limit value or the lower limit value. When it exceeds, it becomes possible to form a control correction value by multiplying a higher fixed constant (E) gain without performing speed feedback, and delay the response of the drive voltage even with pulse-like load fluctuations. It is possible to quickly converge to the target value without any problem, and similarly, the driving power source of the remote unit 23 is quickly stabilized.

Further, in the high frequency type remote sensor control apparatus of the present invention, as shown in FIG. 5A, the control high frequency signal from the resonance circuit 19 is increased from the state where there is no high frequency signal or the level is low beyond a predetermined control start point. When the remote unit 23
The reception signal processing unit 17 can be formed so as to form the control signal S1 based on the correction control signal transmitted from.

As described above, when the reception signal processing unit 17 is formed so as to form the control signal S1 after the level of the correction control signal transmitted from the remote unit 23 becomes large to some extent, the remote unit 23 far away from the base unit becomes remote. When approaching 13, it becomes possible to start transmission of power supply power without raising the drive voltage on the remote unit 23 side at once, and the drive voltage of the remote unit 23 does not easily exceed the upper limit value. .

Further, according to the present invention, as shown in FIG. 5B, when the control high frequency signal is not continuously input for a predetermined number of times or more, the control signal S1 which does not output the PWM power supply high frequency signal is generated as a control error. The reception signal processing unit 17 can be formed to output to the driving unit 15.

With such a configuration, even if the remote section 23 is separated from the base section 13 and communication is impossible, it is not necessary to output a high frequency PWM power supply high frequency signal from the oscillation driving section 15, resulting in malfunction. It is possible to prevent or maintain and improve the durability of the circuit.

[0059]

As described above, in the high frequency type remote sensor control device according to the present invention, the remote unit operated by the driving power source wirelessly transmitted from the base unit is
The deviation between the measured value of the driving power supply and the preset reference power supply level is multiplied by a predetermined proportional gain to form a first correction value, and the deviation between the previous measured value and the measured value is differentiated by a predetermined value. The gain is multiplied to form a second correction value, the first correction value
And the second correction value are added and added to the previous control correction value.
The base part that is formed to modulate a predetermined control high-frequency signal with the calculated new control correction value and emits it to the outside, and transmits the high-frequency signal for the PWM power source to the remote part, receives the detected control correction value. Since the duty ratio of the high-frequency signal for the PWM power supply is variably controlled based on the above, even if there is a load change in the remote unit, the drive power wirelessly transmitted from the base unit to the remote unit can be stabilized extremely quickly. You can do it. Further, when the drive power source becomes larger or smaller than a predetermined upper limit value or lower limit value,
In the configuration in which the remote section is formed so as to modulate the control high-frequency signal by obtaining the control correction value by multiplying the deviation from the reference power supply level by the fixed correction value, the drive power supply in the remote section Not only before and after the reference power supply level, but also when the driving power supply is stabilized more or less than the upper limit value or the lower limit value. The driving power can be stabilized.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing an embodiment of a high-frequency remote sensor control device according to the present invention.

FIG. 2 is a waveform diagram illustrating an operation of the high frequency remote sensor control device of FIG.

FIG. 3 is a diagram for explaining the operation of the high-frequency remote sensor control device in FIG.

FIG. 4 is a flowchart illustrating an operation of the high frequency remote sensor control device of FIG.

5 is a diagram for explaining the operation of the high-frequency remote sensor control device in FIG.

FIG. 6 is a schematic block diagram showing a conventional high-frequency remote sensor control device.

[Explanation of symbols]

1, 13 Base unit 3, 7, 9, 11, 19, 21, 25, 27 Resonance circuit 5, 23 Remote unit 15 Oscillation drive unit 17 Received signal processing unit 29 Rectification smoothing circuit 31 Load circuit 33 Transmission signal processing unit C1, C2, C3, C4, C5, C6, C7, C8 Capacitors D1, D2, Dn Light emitting diodes D3, D4 Diodes L1, L2, L3, L4, L5, L6, L7, L8 Coil SW1, SW2, SWn switch

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02M 3/28 G08C 19/12 H02J 17/00 H04Q 9/00

Claims (2)

(57) [Claims] 1. A base unit that emits a high frequency signal for PWM power supply having a predetermined duty ratio to the outside, and a remote unit that forms a drive power supply from the high frequency signal for PWM power supply and that operates electronically by this drive power supply. In the high-frequency remote sensor control device, the remote unit multiplies a deviation between a measured value of the driving power supply and a preset reference power supply level by a predetermined proportional gain to obtain a first proportional gain. A correction value is formed, a deviation between the previous measurement value and the measurement value is multiplied by a predetermined differential gain to form a second correction value, and the first and second correction values are added.
It has a function of modulating a predetermined control high-frequency signal with a new control correction value that is added to the previous control correction value and emitting it to the outside, and the base unit receives and detects the control high-frequency signal. A high frequency remote sensor control device having a function of variably controlling the duty ratio based on the control correction value. 2. The remote unit multiplies a deviation from the reference power source level by a fixed correction value when the measured value of the drive power source exceeds a predetermined upper limit value or a lower limit value and increases or decreases. The high frequency type remote sensor control device according to claim 1, wherein the control correction value is obtained to modulate the control high frequency signal.