JPH0876862A - Method and device for igniting control rectifier, and massage machine - Google Patents

Abstract

PURPOSE: To secure the conduction of the control rectifiers which undergo the phase control by changing the pulse width of ignition signal that is inputted to each gate of both rectifiers relating to the energization phases of rectifiers and inhibiting the output of the ignition signal of each rectifier when this signal reaches the zero-crossing point of the AC voltage. CONSTITUTION: The ignition device is provided with bidirectional control rectifiers 4 and 5 which control the energization phase of the drive current of an induction motor 3, photocouplers 6 and 7 which input the ignition signals to the gates of both rectifiers 4 and 5, a zero-crossing point detection part ZD which detects the zero-crossing point of the AC voltage, and a CPU 10. In such a constitution, the pulse width of the ignition signal related to the energization phase is changed when the energization phases of the rectifiers 4 and 5 are controlled. Thus, the rectifiers 4 and 5 can surely conduct in either of both energization phases. Meanwhile, since the output of an ignition command signal is inhibited when the ignition signal reaches the zero-crossing point of the AC voltage, a commutating actions can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for igniting a controlled rectifier, and a massage machine.

[0002]

2. Description of the Related Art A stool-type massage machine is provided with a massager for massaging, striking, and acupressure, which are massage operations, at its back contact portion. The massager is adapted to perform a rubbing operation, a tapping operation, a finger pressure operation, and the like by different induction motors, and is driven to perform a massage operation. Each induction motor is driven by a drive current whose phase is controlled by a controlled rectifier. Then, by controlling the phase of the drive current, the output of the induction motor is controlled to adjust the massage force.

[0003]

As described above, the gate of the control rectifier for supplying the drive current to the induction motor has a predetermined energization phase of the drive voltage supplied to the induction motor and a firing signal of a predetermined pulse width. Is input to turn on the control rectifier. Due to the conduction of the control rectifier, a drive current having a predetermined conduction phase is supplied to the induction motor to drive the induction motor. Then, when the energization phase of the control rectifier is made small and the induction motor is driven at a low output, the drive voltage of the induction motor is phase-controlled as shown in FIG.

The drive voltage of the induction motor shown in FIG.
Full-wave rectified voltage V_RCDetected the zero-cross point
Zero-crossing detection pulse P shown in Fig. 4 (b)₀Based on
Drive voltage V shown in Fig. 4 (d)_MFor example, in the energization phase F of FIG.
Pulse width T shown in (c)₁Ignition signal P_GControl the rectifier
Input to the gate to turn on the controlled rectifier. However,
When the potential phase is small, that is, the drive voltage V_MThe instantaneous value of is small
Ignition signal P at the time of opening _GPulse width T₁However, the instantaneous value is large
Ignition signal P at threshold_GIf the pulse width is less than
If the control rectifier is not conducting, the
The drive voltage V of the energized phase that has been lined_MTo the induction motor
There is a risk that the output of the induction motor will decrease because it cannot be supplied.
is there. Therefore, the ignition signal P_GPulse width T₁Figure 4 (c)
In the pulse width from phase F to phase H as shown by the broken line in
Then, the ignition signal P_GReaches the zero-cross point and controls rectification
The commutator will move and the induction motor will rotate normally.
Will not do.

On the other hand, the energization phase of the controlled rectifier is increased,
When driving the induction motor at high output, drive the induction motor.
The dynamic voltage is phase-controlled as shown in FIG. In this case, the figure
Full-wave rectified full-wave rectification of the drive voltage of the induction motor shown in 5 (a)
Rectified voltage V_RCFig. 5 (b) shows the detected zero-cross point
Zero cross detection pulse P₀Drive voltage V _M
For example, in the energization phase I, the pulse width T shown in FIG.₂of
Ignition signal P_GTo generate this ignition signal P_GControl the
Input to the gate of the sink to bring the controlled rectifier into conduction. Shi
However, when the energization phase is large like this,
Pressure V_MFiring signal P when the instantaneous value of is small_GPulse width of
T₂Is the ignition signal P when the instantaneous value is large_GPulse width of
If it is more insufficient, control is performed as in the case of FIG.
There may be cases where the rectifier does not conduct, as shown in Fig. 5 (d).
Drive voltage V due to energized phase I with diagonal lines
_MCannot be supplied to the induction motor, and the output of the induction motor
May decrease.

Therefore, when the pulse width of the ignition signal P _{G is set to} the pulse width from the phase I to the phase G as shown by the broken line in FIG. 5 (c), the ignition signal is reduced when the energization phase is reduced as described above. Since P _G reaches the zero cross point, the energization phase cannot be reduced. Therefore, the massage force of the treatment element driven by the induction motor decreases when the energization phase is large or small and the phase is controlled, and the massage force may not be changed smoothly according to the phase control. There is a problem that there is In view of such a problem, the present invention provides a method for igniting a controlled rectifier capable of reliably conducting a controlled rectifier whose phase is controlled, and an ignition device.
Another object of the present invention is to provide a massage machine that can smoothly change the massage power.

[0007]

A method for igniting a controlled rectifier according to a first aspect of the present invention is a method for igniting a controlled rectifier for controlling a conduction phase of an AC voltage, wherein an ignition signal input to a gate of the controlled rectifier is used. The time width is set to a time width related to the energization phase, and when the ignition signal extends to the zero cross point of the AC voltage, the output of the ignition signal is prohibited.

The ignition device for a controlled rectifier according to the second invention is
In the ignition device of the control rectifier for controlling the energization phase of the AC voltage, the energization phase for conducting the control rectifier, a means for determining whether or not the predetermined phase range of the AC voltage, the energization phase of the AC voltage A means for instructing the output of an ignition signal having a time width associated with the phase range when it is determined that the ignition signal is in the predetermined phase range, and a means for determining whether or not the ignition signal extends to the zero phase of the AC voltage. And a means for prohibiting the command to output the ignition signal when it is determined that the ignition signal reaches the zero phase.

A massager according to a third aspect of the present invention is a massager in which an induction motor for driving a massager massaging element is energized by a control rectifier for controlling the energization phase of an AC voltage to drive the induction motor. A means for determining whether or not the energization phase for conducting the controlled rectifier is within the predetermined phase range of the AC voltage, and, when the energization phase is determined to be within the predetermined phase range of the AC voltage, is related to the phase range. Means for instructing the output of an ignition signal having a time width of, a means for determining whether the ignition signal reaches the zero phase of the AC voltage, and a point when it is determined that the ignition signal reaches the zero phase. And means for prohibiting an instruction to output an arc signal.

[0010]

In the first aspect of the invention, the pulse width of the firing signal input to the gate of the controlled rectifier is changed in relation to the energization phase of the controlled rectifier. When the ignition signal reaches the zero cross point of the AC voltage, the output of the ignition signal of the controlled rectifier is prohibited. As a result, the controlled rectifier can be surely brought into conduction, and the commutation operation of the controlled rectifier can be prevented.

According to the second aspect of the invention, it is determined whether or not the energizing phase for conducting the controlled rectifier is within a predetermined phase range of the AC voltage. When it is determined that the energized phase is in the predetermined phase range of the AC voltage, the ignition signal of the time width related to the phase range is input to the gate of the control rectifier to make the control rectifier conductive. When it is determined that the ignition signal reaches the zero cross point of the AC voltage, the output of the ignition signal is prohibited and the control rectifier is made non-conductive.
As a result, the controlled rectifier can be surely brought into conduction, and the commutation operation of the controlled rectifier can be prevented.

In the third aspect of the invention, it is determined whether or not the energizing phase for conducting the controlled rectifier is within a predetermined phase range of the AC voltage. When it is determined that the energized phase is within the predetermined phase range, an ignition signal having a time width associated with the phase range is input to the gate of the control rectifier to turn on the control rectifier. When it is determined that the ignition signal reaches the zero-cross point of the AC voltage, the output of the ignition signal is prohibited and the control rectifier is made non-conductive. A massager is massaged by an induction motor driven by a drive current supplied from a control rectifier. Accordingly, the control rectifier can be surely conducted, the commutation operation of the control rectifier can be prevented, and the massage force can be smoothly controlled according to the phase control of the control rectifier.

[0013]

The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a block diagram showing the configuration of an ignition device for a controlled rectifier according to the present invention. One side terminal 1a of AC power supply 1
Is connected to one side input terminal 2a of full-wave rectifier circuit 2, and is also connected to one side terminals of coil 3a and coil 3b of induction motor 3, respectively. The other side terminal 1b of the AC power supply 1 is connected to the other side input terminal 2b of the full-wave rectifier circuit 2, and is also connected to one side terminal 4a of the bidirectional control rectifier 4 and one side terminal 5a of the bidirectional control rectifier 5. . The other side terminal 4b of the bidirectional control rectifier 4 is connected to the other side terminal of the coil 3a of the induction motor 3, and the resistance R
It is connected to the gate of the bidirectional control rectifier 4 through a series circuit of ₁ and the light receiving transistor 6a of the photocoupler 6. The other terminal 5b of the bidirectional control rectifier 5 is connected to the other terminal of the coil 3b of the induction motor 3, and the bidirectional control rectifier 5 is connected via a series circuit of the resistor R ₂ and the light receiving transistor 7a of the photocoupler 7. Connected with the gate of.

A phase advancing capacitor C is provided between the other terminals of the coils 3a and 3b of the induction motor 3. Photo coupler 6
The anode of the light emitting diode 6b is connected to the power source V _C ,
Its cathode is connected to the emitter of the transistor 8 whose collector is grounded. The anode of the light emitting diode 7b of the photocoupler 7 is connected to the power source V _C, and the cathode thereof is connected to the emitter of the transistor 9 whose collector is grounded. The bases of the transistors 8 and 9 include an arithmetic unit 10a, a memory 10b,
An L-level ignition command signal is input from the CPU 10 having the built-in counter 10c. The rotation speed of the induction motor 3 is detected by the speed detection unit 11, and the detection signal is input to the CPU 10. The output terminal from which the full-wave rectified voltage is output from the full-wave rectification circuit 2 is connected to one side input terminal 12a of the comparator 12,
The other side input terminal 12b has a reference power supply 13 with an extremely low voltage.
Is connected.

The zero-crossing detection signal which is the comparison output of the comparator 12 is input to the CPU 10. The full-wave rectifier circuit 2, the comparator 12, and the reference power source 13 constitute a zero-cross detector ZD. A massage command signal of the operation unit 14 that commands the content of the massage operation is input to the CPU 10. The output of the induction motor 3 is applied to a massager (not shown) that performs a massage operation to drive the massager.

Next, the operation of the ignition device for the controlled rectifier configured as described above will be described with reference to the flowchart of FIG. 2 showing the control contents of the CPU, and FIG. 3 showing the timing chart showing the relationship between the full-wave rectified voltage and the signals of each part. Will be explained together. First, prior to the operation, the memory 10b stores an ignition signal that can surely turn on the bidirectional control rectifiers 4 and 5 in an appropriate phase range unit within one cycle T of the full-wave rectified voltage shown in FIG. 3 (a). Stores pulse width data. That is, a large value is selected in the phase range where the instantaneous value of the AC voltage is small, and a small value is selected in the phase range where the instantaneous value is large.

For example, as shown in FIG. 3C, when one cycle T of the full-wave rectified voltage shown in FIG. 3A is divided into 38,
Above the phase corresponding to (28/38) T and below the phase corresponding to (10/38) T, the pulse width of the ignition signal, that is, the data whose time width is (3/38) T is (28/38) ) The data has a time width of (1/38) T in the range from the phase corresponding to T to the phase corresponding to (10/38) T.

Now, when the AC power supply 1 is turned on, the AC voltage is full-wave rectified by the full-wave rectification circuit 2, and the full-wave rectified voltage V _RC shown in FIG. Is entered. As a result, the comparator 12 becomes the full-wave rectified voltage V _RC and the reference power source.
13 is compared with the reference voltage, and the full-wave rectified voltage V _RC is equal to or less than the reference voltage, that is, at each zero-cross point.
Output the zero-cross detection signal shown in (b) and input to CPU 10.

Now, the operating unit 14 is operated to perform a massage operation.
When a massage command signal is input to CPU 10 by operating,
The calculation unit 10a calculates the energization phase φ of the bidirectional control rectifiers 4 and 5 based on the input massage command signal by the CPU 10 (S1). The energization phase φ calculated here can be calculated as, for example, (36/3
8) Set the phase corresponding to T. Subsequently, it is determined whether the calculated energization phase φ is larger than the phase corresponding to (28/38) T (S2). When it is determined that the energized phase φ is larger than the phase corresponding to (28/38) T, the pulse width data (3/3) determined from the memory 10b corresponding to the above-mentioned phase range including (28/38) T. 38) Read T (S3). Then, as shown in Fig. 3 (d), the energization phase (36
/ 38) At time T, the CPU 10 outputs an L level ignition command signal to the base of the transistor 8, for example (S4). At that time, the counter 10c starts counting time.

The transistor 8 is turned on by the output of the ignition command signal, and the energizing current of the transistor 8 causes the light emitting diode.
6b emits light, the light receiving transistor 6a is turned on, an ignition signal is input to the gate of the bidirectional control rectifier 4, and the bidirectional control rectifier 4 becomes conductive. As a result, a drive current having a large energization phase flows from the AC power supply 1 to the coil 3a of the induction motor 3 and the induction motor 3 rotates in the positive direction. In this case, the induction motor 3 has a large output. Subsequently, when the counter 10c measures (3/38) T, the counter 10c is reset, and when it is determined that the time measurement by the pulse width data (3/38) T is completed (S5), the firing command is issued. Cut off the signal (S6). That is, the firing signal shown in FIG. 3 (d) is input to the bidirectional control rectifier 4. In this way, the bidirectional control rectifier 4 is surely conducted by using the ignition signal having the pulse width related to the conduction phase.

By the way, the calculated conduction phase is (20/38)
If it is determined that the calculated energization phase φ is not greater than or equal to the phase corresponding to (28/38) T in step (S2), then the energization phase φ corresponds to (10/38) T. It is determined whether or not it is in the phase range from the phase to be performed to the phase corresponding to (28/38) T (S7). And (10/38) T
When it is determined that the range from the phase corresponding to (28/38) T to the phase corresponding to (28/38) T is determined, the memory 10b to (10/38) T
The pulse width data consisting of the time of (1/38) T defined for the phase range from the phase corresponding to (28/38) T to the phase corresponding to (28/38) T is read (S8).

Then, with reference to the zero-cross point, FIG.
As shown in, the CPU 10 outputs the ignition command signal to the base of the transistor 8 in the phase corresponding to the energization phase φ (20/38) T (S9). Also, the counter 10c starts counting time. The transistor 8 is turned on by the output of the firing command signal, the light-emitting diode 6a is turned on by the energizing current, and the bidirectional control rectifier 4 is turned on as described above. Thereby, the coil 3a of the induction motor 3 from the AC power supply 1
Then, the drive current flows with the phase corresponding to (20/38) T as the conduction phase, and the induction motor 3 rotates forward. in this case,
The induction motor 3 has a medium output. And the counter 10c
(1/38) When T is timed, the counter 10c is reset,
When it is determined that the time measurement based on the pulse width time data (1/38) T is completed (S10), the ignition command signal is cut off (S11). In this way, in the phase range where the instantaneous value of the AC voltage is high, the bidirectional control rectifier 4 is surely conducted even if the ignition signal has a small pulse width.

Further, the calculated energization phase φ is (7/38) T
The phase corresponding to, in step (S7), (10
/ 38) If the phase range corresponding to (28/38) T is not within the phase range corresponding to (28/38) T, the phase corresponding to (2/38) T is calculated from the phase corresponding to (2/38) T. It is determined whether it is within the range (S12). When it is determined that the phase range is from the phase corresponding to (10/38) T to the phase corresponding to (2/38) T, the memory 10b stores (10/38) T
The pulse width data consisting of the time of (3/38) T defined in the phase range from the phase corresponding to (3/38) T to the phase corresponding to (2/38) T is read (S13). Then, as shown in Fig. 3 (f), the energization phase (7
/ 38) Transistor 8 by CPU 10 at the phase corresponding to T
An ignition command signal is output to the base of (S14).

The counter 10c also starts clocking. The transistor 8 is turned on by outputting the ignition command signal, and the bidirectional control rectifier 4 is (7/38) T as described above.
Conduct in the phase corresponding to. Then, the induction motor 3 rotates forward. In this case, the induction motor 3 has a small output. And when the counter 10c measures the time of (3/38) T,
Reset counter 10c. In this way, when it is determined that the time measurement by the pulse width data (1/38) T is completed (S15), the ignition command signal is cut off (S16). In this way, the bidirectional control rectifier 4 can be surely conducted by the ignition signal having the pulse width corresponding to the energization phase.

Further, in step (S12), the energization phase φ
If it is determined that is not within the phase range of the phase corresponding to (10/38) T to the phase corresponding to (2/38) T, the CPU 10 prohibits the command to output the ignition command signal (S17). In this way, when the energization phase φ is the phase corresponding to (2/38) T, the pulse width of the ignition signal extends to the zero cross point as shown by the broken line in Fig. 3 (f). Although there is a risk that the bidirectional control rectifier will perform a commutation operation, the commutation operation can be prevented by prohibiting the output of the ignition signal. In this way, if the output of the ignition signal is prohibited, it becomes impossible to supply the drive current to the induction motor 3 with the phase corresponding to (2/38) T as the conduction phase, but the drive current due to the extremely small conduction phase of this degree is extremely small. Since it is small, the output of the induction motor 3 is not adversely affected.

Although the ignition command signal from the CPU 10 is applied to the base of the transistor 8 to rotate the induction motor 3 forward, if the ignition command signal output in the same manner as above is applied to the base of the transistor 9. , The bidirectional control rectifier 5 is turned on, a drive current flows through the coil 3b of the induction motor 3, and the induction motor 3 rotates in the reverse direction.

When controlling the energization phase of the bidirectional control rectifier in this way, the bidirectional control rectifier can be reliably operated in any energization phase by changing the pulse width of the firing signal related to the energization phase. It can be conducted. When the ignition signal reaches the zero-cross point of the AC voltage, the output of the ignition command signal is prohibited, so that the commutation operation of the bidirectional control rectifier can be prevented. Thereby, the massage force of the treatment element driven by the induction motor can be smoothly controlled, and the massage element can comfortably perform the massage.

In this embodiment, the bidirectionally controlled rectifier is phase-controlled, but the same effect can be obtained by similarly controlling the phase of the controlled rectifier. In addition, in this embodiment, the time T of one cycle of the full-wave rectified voltage is divided into 38, and the phases are divided into phases corresponding to (28/38) T and (10/38) T, and the points are divided in units of the divided phase ranges. Although the pulse width data of the arc signal is defined, the phase range thereof is an example, and the invention is not limited to this.

[0029]

As described above in detail, the first invention and the second invention
According to the invention, when controlling the phase of the controlled rectifier, the time width of the ignition signal is changed in relation to the energization phase, so that the controlled rectifier can be surely conducted. Further, when the ignition signal reaches the zero-cross point of the AC voltage, the ignition command is prohibited and not conducted, so that the commutation operation of the control rectifier can be prevented.

According to the third aspect of the present invention, the drive current of the induction motor for driving the massaging element is supplied by the control rectifier for phase control, and the phase control of the control rectifier is performed.
Since the time width of the ignition signal related to the energization phase is changed and performed, the controlled rectifier can be surely conducted.
Further, when the ignition signal reaches the zero-cross point of the AC voltage, the ignition command is prohibited and is not conducted, so that the commutation operation of the control rectifier can be prevented. Therefore, the present invention has excellent effects such as providing a massage machine in which the output of the induction motor can be smoothly controlled by the phase control of the control rectifier to smoothly adjust the massage force by the treatment element.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an ignition device for a controlled rectifier according to the present invention.

FIG. 2 is a flowchart showing the control contents of the CPU.

FIG. 3 is a timing chart showing a relationship between a full-wave rectified voltage and signals of respective parts.

FIG. 4 is a timing chart showing a relationship between a full-wave rectified voltage and signals of respective parts.

FIG. 5 is a timing chart showing a relationship between a full-wave rectified voltage and signals of respective parts.

[Explanation of symbols]

 1 AC power supply 3 Induction motor 4,5 Bidirectional control rectifier 6,7 Photocoupler 10 CPU ZD Zero cross detector

Claims (3)

[Claims] 1. A method for igniting a controlled rectifier for controlling a conduction phase of an AC voltage, wherein a time width of an ignition signal input to a gate of the controlled rectifier is set to a time width related to the conduction phase. A method of igniting a controlled rectifier, characterized in that the output of the ignition signal is prohibited when the signal reaches the zero-cross point of the AC voltage. 2. An ignition device for a controlled rectifier for controlling an energization phase of an AC voltage, a means for determining whether an energization phase for conducting the controlled rectifier is within a predetermined phase range of the AC voltage, and an energization. When it is determined that the phase is in the predetermined phase range of the AC voltage, means for instructing the output of the ignition signal of the time width related to the phase range, and whether the ignition signal reaches the zero phase of the AC voltage An ignition device for a controlled rectifier, comprising: means for determining whether or not the ignition signal reaches a zero phase, and means for inhibiting an instruction to output the ignition signal. 3. An energizing phase for energizing an induction motor for driving a massaging element by a control rectifier for controlling an energization phase of an AC voltage, and for energizing the control rectifier in a massage machine for driving the induction motor. Is a means for determining whether the AC voltage is within a predetermined phase range, and, when the energized phase is determined to be within a predetermined phase range for the AC voltage, an ignition signal having a time width associated with the phase range. Means for determining the output of the ignition signal, a means for determining whether the ignition signal extends to the zero phase of the AC voltage, and a command for the output of the ignition signal when it is determined that the ignition signal extends to the zero phase. A massage machine characterized by being provided with a prohibition means.