JP6426464B2 - Electric solar shading device and control method of electric solar shading device - Google Patents

Description

  The present invention relates to a control device for an electric solar shading device that drives a shielding material by a driving force of a motor, such as an electric horizontal blind, an electric vertical blind, an electric roll blind, an awning, an electric shutter, and the like.

  In the motorized horizontal blind, the drive shaft is rotated by the driving force of a motor disposed in the head box to raise and lower the slat. In motorized horizontal blinds that do not precisely control the elevation height and elevation speed of the slat, an AC motor that can be driven by a commercial power source is used.

  This AC motor is generally cheaper than a DC motor. Further, since the commercial power source is used as the power source, the power source circuit required for the DC motor is not necessary. Therefore, the use of an AC motor can reduce the manufacturing cost.

  Such a motorized horizontal blind is provided with a mechanical limit mechanism that stops the operation of the motor when the slat is pulled up to the upper limit or lowered to the lower limit.

  In addition, a thermal protector is provided to stop the operation of the motor and prevent burnout of the motor when the motor is overheated due to an overload.

Patent No. 3546044

  In the motorized horizontal blind as described above, when the operation of the motor is stopped by the mechanical limit mechanism or when the motor is stopped by the thermal protector, the control unit can not know whether the motor has stopped. In addition, since it is not possible to grasp the stop of the motor, it is also impossible to grasp the elevation position of the slat.

  If the amount of rotation of the slat drive shaft is constantly detected by the encoder in order to grasp the slat elevation position, it is possible to detect whether the motor is stopped and the elevation height of the slat.

However, there is a problem that the cost for providing the encoder and the control unit that controls the operation of the motor based on the output signal of the encoder increases.
Patent Document 1 discloses a detection device that detects whether the motor is rotating by comparing the phase of the AC power supply voltage with the phase of the current supplied to the motor. However, it is not possible to know under what circumstances the motor was stopped.

  An object of the present invention is to provide an electric solar radiation shielding apparatus capable of grasping the operating state of a motor and the state of a shielding material when the motor is stopped with an inexpensive configuration.

  According to the first aspect of the present invention, there is provided an electric solar radiation shielding apparatus in which a shielding material is driven by an AC motor, wherein an AC power supply voltage supplied to the AC motor is compared with an operating voltage between a CW line and a CCW line of the AC motor. And a control device for detecting the operating state of the AC motor.

  In the second aspect of the invention, the control device performs a waveform shaping on the basis of the first pulse conversion circuit that shapes the AC power supply voltage based on a preset threshold, and the operating voltage based on the threshold. A second pulse conversion circuit for shaping, and detection means for detecting an operating state of the AC motor by comparing an output signal of the first pulse conversion circuit and an output signal of the second pulse conversion circuit. The

  In Claim 3, the CW line of the AC motor interposes a first limit switch which becomes nonconductive when the shielding member is moved to one movement limit, and the CCW line of the AC motor is connected to the CW switch. A third limit switch is provided which intervenes with the second limit switch which becomes nonconductive when the shielding member is moved to the other movement limit, and the COM line of the AC motor becomes nonconductive due to the overheating of the AC motor. And the detection means compares the output signal of the first pulse conversion circuit with the output signal of the second pulse conversion circuit to detect the operating state of the AC motor and the movement position of the shielding member. Do.

  According to the fourth aspect of the present invention, the operating condition of the AC motor is detected by comparing the AC power supply voltage supplied to the AC motor with the operating voltage between the CW line and the CCW line of the AC motor.

  In the fifth aspect of the present invention, the AC power supply voltage is waveform-shaped with a preset threshold to generate a first output signal, and the operating voltage is waveform-shaped with the threshold to generate a second output signal. The operation state of the limit switch interposed in the CW line and the limit switch interposed in the CCW line is generated based on the comparison result by comparing the phases of the first output signal and the second output signal. It detects and detects the movement position of the said shielding material.

  In the sixth aspect of the present invention, the AC power supply voltage is waveform-shaped with a preset threshold to generate a first output signal, and the operating voltage is waveform-shaped with the threshold to generate a second output signal. The duty ratio of the first output signal and the second output signal is compared, and it is detected based on the comparison result whether or not the AC motor is operating.

  In the seventh aspect, the AC power supply voltage is waveform-shaped with a preset threshold to generate a first output signal, and the operation voltage is waveform-shaped with the threshold to generate a second output signal. It generates, detects whether or not the duty ratio of the second output signal is constant, and detects, based on the detection result, whether or not an overload is acting on the AC motor.

  According to an eighth aspect of the present invention, the AC power supply voltage is waveform-shaped at a preset threshold to generate a first output signal, and the operating voltage is waveform-shaped at the threshold to generate a second output signal. It generates, detects whether the duty ratio of the first output signal and the second output signal is the same, and determines whether the AC motor is overloaded based on the detection result. To detect.

  According to the present invention, the electric solar radiation shielding device capable of grasping the operating state of the motor and the state of the shielding member when the motor is stopped can be configured inexpensively.

It is a block diagram showing a control device of a first embodiment. It is a circuit diagram showing a first pulse converter circuit. FIG. 6 is a waveform chart showing the operation of the first pulse conversion circuit. It is a circuit diagram showing a drive circuit. It is a wave form diagram which shows the electrical potential difference of CW line and CCW line. FIG. 7 is a waveform diagram showing an operation of a second pulse conversion circuit. FIG. 7 is a waveform diagram showing an operation of a second pulse conversion circuit. FIG. 7 is a waveform diagram showing an operation of a second pulse conversion circuit. FIG. 7 is a waveform diagram showing an operation of a second pulse conversion circuit. It is a wave form diagram which shows operation | movement of the 2nd pulse converter circuit of 2nd embodiment. It is a flowchart which shows operation | movement of CPU of 1st embodiment. It is a flowchart which shows operation | movement of CPU of 1st embodiment. It is a flowchart which shows operation | movement of CPU of 1st embodiment. It is a flowchart which shows operation | movement of CPU of 2nd embodiment. It is a block diagram showing a control device of a third embodiment. It is a circuit diagram showing a transformer for voltage detection of a third embodiment. It is explanatory drawing which shows operation | movement of the A / D conversion circuit of 3rd embodiment.

(First embodiment)
A first embodiment of the present invention will now be described with reference to the drawings. FIG. 1 shows the electrical configuration of the control device of the motorized horizontal blind. The control device 1 is provided separately from the head box of the motorized horizontal blind.

  The control device 1 is supplied with a commercial AC power supply Vac of AC 100 V. Then, the AC power supply Vac is stepped down to a predetermined AC voltage by the transformer 2 and supplied to the power supply circuit 3. The power supply circuit 3 converts the stepped-down AC voltage into a predetermined DC voltage, and supplies the DC voltage to the CPU 4 as a power supply.

  The alternating current power supply Vac is supplied to the first pulse conversion circuit 5. As shown in FIG. 2, in the first pulse conversion circuit 5, the AC power supply Vac is input to the half wave rectification circuit 6. The voltage amplitude of the AC power supply Vac of 100 V AC becomes an amplitude slightly exceeding 120 V. As shown in FIG. 3, the half-wave rectifier circuit 6 outputs a rectified voltage V rec1 obtained by half-wave rectifying the AC power supply Vac to the waveform shaping circuit 7.

  The waveform shaping circuit 7 uses, for example, a Zener diode with a breakdown voltage of 120 V, and outputs an output signal Vo1 obtained by shaping the rectified voltage Vrec1 to the photocoupler 8 using the breakdown voltage as a threshold Vt. As shown in FIG. 3, when the rectified voltage Vrec1 exceeds the threshold value Vt, the photocoupler 8 conducts to set the output signal Vo1 to L level, and becomes less than the threshold value Vt to turn the output signal Vo1 high. Level Then, the output signal Vo1 of the photocoupler 8 is output to the CPU 4.

  An operation signal output from the operation switch 9 is input to the CPU 4 through the communication input / output circuit 10. When a plurality of motorized horizontal blinds are arranged in parallel, the operation signal is output to the CPUs of the other consecutive blinds 11 via the communication input / output circuit 10.

  The CPU 4 outputs control signals C1 and C2 for driving the AC synchronous motor 12 to the drive circuit 14 via the photocoupler 13 based on the operation signal. The photocoupler 13 has a configuration similar to that of the photocoupler 8 and outputs control signals C1 and C2 to the drive circuit 14 without increasing the load on the CPU 4.

  As shown in FIG. 4, the drive circuit 14 supplies an AC power supply Vac to the first switch circuit 15 a that supplies an AC power supply Vac to the CW line of the AC synchronous motor 12 and a CCW line to the AC synchronous motor 12. And a second switch circuit 15b. A series circuit of a resistor R and a capacitor C is connected in parallel to the first and second switch circuits 15a and 15b.

The first and second switch circuits 15a and 15b are controlled by the control signals C1 and C2 to a state in which either one is in a conductive state or in a state in which both are in a nonconductive state.
A rising limit switch 16 is interposed in the CW line of the AC synchronous motor 12, and a falling limit switch 17 is interposed in the CCW line. The rising limit switch 16 is controlled to be nonconductive when the slat of the motorized horizontal blind is pulled up to the upper limit, and the lowering limit switch 17 is nonconductive when the slat of the motorized horizontal blind is lowered to the lower limit It is controlled.

  A phase advancing capacitor Cf is connected between the CW line and the CCW line of the AC synchronous motor 12. An AC power supply Vac is supplied to the COM line of the AC synchronous motor 12 through a thermal protection switch 23.

  In such an AC synchronous motor 12, as shown in FIG. 5, when the rising limit switch 16 becomes nonconductive, the voltage V1a between the CW line and the CCW line is in the same phase as the AC power supply Vac.

Further, when the down limit switch 17 becomes nonconductive, the voltage V1b between the CW line and the CCW line is out of phase by 180 degrees with respect to the AC power supply Vac.
The control device 1 is provided with a second pulse conversion circuit 18 to which a potential difference between the CW line and the CCW line of the AC synchronous motor 12 is input. The configuration of the second pulse conversion circuit 18 is the same as that of the first pulse conversion circuit 5, and the output signal Vo 2 is output to the CPU 4 via the photocoupler 19.

  As shown in FIG. 6, the amplitude of the potential difference Vacm between the CW line and the CCW line when the AC synchronous motor 12 is in operation is larger than the amplitude of the AC power supply Vac shown in FIG. Then, the output signal Vo2 obtained by shaping the rectified voltage Vrec2 in which the potential difference Vacm is half-wave rectified by the second pulse conversion circuit 18 with the threshold voltage Vt has a duty ratio different from that of the output signal Vo1 shown in FIG. .

  More specifically, the period of the output signal Vo1 is T, the time width of the L level is t, and the period of the output signal Vo2 is T like the output signal Vo1, and the time width of the L level is t1. (T1 / T)> (t / T).

  Further, in a state where the slat is pulled up to the upper limit and the rising limit switch 16 becomes nonconductive, as shown in FIG. 7, the potential difference V1a between the CW line and the CCW line has the same phase and same phase as the AC power supply Vac. The output signal Vo2 of the photocoupler 19 has the same phase as the output signal Vo1 of the photocoupler 8.

  Further, in a state where the slat is lowered to the lower limit and the lowering limit switch 17 becomes nonconductive, the potential difference V1b between the CW line and the CCW line is in reverse phase to the AC power supply Vac as shown in FIG. The output signal Vo2 is out of phase with the output signal Vo1 of the photocoupler 8.

  Further, when an overload is applied to the AC synchronous motor 12 to cause a step-out state, as shown in FIG. 9, the voltage difference of the potential difference V1c is disturbed, and similarly, the rectified voltage Vrec2 is also disturbed. Therefore, the output signal Vo2 of the photocoupler 19 becomes a pulse signal whose duty ratio fluctuates due to fluctuation of the time width (t2, t3, etc.) at which the L level is reached.

  The CPU 4 operates based on a preset program. Then, based on the operation signal output from the operation switch 9, the control signals C1 and C2 are output to control the drive circuit 14.

  Further, by comparing the output signals Vo1 and Vo2 output from the photocouplers 8 and 19, the operating state of the AC synchronous motor 12 and the elevation position of the slat are detected, and the state signal based on the detection result is output as a state signal The data is output to the central control device such as a personal computer or the like or another device 21 such as a status display device through the circuit 20.

  A storage device 22 composed of an EEPROM or a RAM is connected to the CPU 4 so as to store position information such as the elevation position of the slat based on the detection result of the operating state of the AC synchronous motor 12.

  The CPU 4 stores pulse signals input as the output signals Vo1 and Vo2 in the storage device 22 for a predetermined time set in advance, and compares the duty ratio and the phase of the stored pulse signals. There is.

  An AC power source Vac is supplied to the COM line of the AC synchronous motor 12 through a known thermal protection switch 23. The thermal protection switch 23 becomes nonconductive when the temperature detection means provided in the AC synchronous motor 12 detects an overheated state of the motor 12, and cuts off the power supply to the AC synchronous motor 12.

  Next, the operation in the case where a synchronous motor is used as the AC synchronous motor 12 in the control apparatus 1 of the motorized horizontal blind configured as described above will be described according to FIGS. 7 to 9 and 11 to 13.

  As shown in FIG. 11, when the AC power supply Vac is supplied to the control device 1 and the power is supplied from the power supply circuit 3 to the CPU 4 (step 1), the CPU 4 starts an operation of detecting the current slat lifting stop position. To do (step 2).

  First, the CPU 4 detects whether the output signal Vo2 from the photocoupler 19 is a pulse signal (step 3). When no pulse signal is detected in step 3, both of the first and second switch circuits 15a and 15b of the drive circuit 14 are in the non-conductive state, and the AC synchronous motor 12 is not supplied with the AC power Vac. In this case, the CPU 4 detects that the AC synchronous motor 12 is stopped in a state where the slat is suspended and supported at the middle position of the elevation range, and stores the position information in the storage device 22 (step 4) . Next, the process proceeds to step 11 shown in FIG.

  When the output signal Vo2 from the photocoupler 19 in step 3 is a pulse signal, the process proceeds to step 5, and the phase of the output signal Vo1 of the photocoupler 8 matches the phase of the output signal Vo2 of the photocoupler 19 or not. It is determined (steps 5, 6).

  When the slat is pulled up to the upper limit and the rising limit switch 16 is in the non-conductive state, as shown in FIG. 7, the potential difference V1a between the CW line and the CCW line has the same phase and the same amplitude as the AC power supply Vac. The output signal Vo2 of the photocoupler 19 is in phase with the output signal Vo1.

  Then, the CPU 4 shifts from steps 5 and 6 to step 7 to detect that the slat is pulled up to the upper limit, and stores the position information in the storage device 22. Then, the corresponding state signal is output (step 8), and the process proceeds to step 11.

  When the slat falls to the lower limit and the falling limit switch 17 becomes nonconductive, as shown in FIG. 8, the potential difference V1 between the CW line and the CCW line has the same amplitude in the reverse phase as the AC power supply Vac. The output signal Vo2 of the photocoupler 19 is a signal having a phase different from that of the output signal Vo1.

  Then, the CPU 4 shifts from steps 5 and 6 to step 9 to detect that the slat is lowered to the lower limit, and stores the position information in the storage unit 22. Then, the corresponding state signal is output (step 10), and the process proceeds to step 11.

  At step 11, the CPU 4 waits for input of the operation signal from the operation switch 9. Then, it is determined based on the position data stored in the storage device 22 whether or not the AC synchronous motor 12 can be rotated based on the operation signal (step 12).

  That is, when the rising limit switch 16 is in a non-conductive state, the rotation of the AC synchronous motor 12 in the slat rising direction is impossible, and the rotation in the slat downward direction is possible. In addition, when the lowering limit switch 17 is in a non-conductive state, the rotation of the AC synchronous motor 12 in the slat lowering direction is not possible, and the rotation in the slat elevating direction is possible.

In addition, when the slat is stopped at an intermediate position in the lifting and lowering range, the AC synchronous motor 12 can rotate in either the slat rising direction or the slat lowering direction.
If the rotation of the AC synchronous motor 12 based on the operation signal is not possible in step 12, the operation signal from the operation switch 9 is ignored (step 13), and the process returns to step 11.

  If it is determined in step 12 that the AC synchronous motor 12 can rotate based on the operation signal, the CPU 4 controls the AC synchronous motor 12 via the drive circuit 14. That is, the AC power supply Vac is supplied to the AC synchronous motor 12 to operate the motor 12 based on the operation signal, and the slat is pulled up or down (step 14).

  Next, the CPU 4 compares the pulse signals of the output signal Vo1 of the photocoupler 8 and the output signal Vo2 of the photocoupler 13 (step 15). When the pulse signal can not be detected as the output signal Vo2, it is determined that the thermal protection switch 23 is not conducting and the supply of the AC power supply Vac to the AC synchronous motor 12 is cut off, and the steps 16 and 17 are taken. Migrate to 18

  Next, at step 18, the supply of the AC power supply Vac from the drive circuit 14 to the AC synchronous motor 12 is stopped. Then, due to the overheating of the AC synchronous motor 12, a state signal indicating that the AC synchronous motor 12 has been stopped is output to the other device 21 while the slat is moving up and down (step 19) The present is stored in the storage device 22 (step 20), and the lifting operation is ended.

  When a change in duty ratio of the output signal Vo2 is detected in steps 16 and 17, it is determined that the load acting on the AC synchronous motor 12 is in an overload state, and the process proceeds to step 21 and the AC is changed from the drive circuit 14. The supply of the AC power supply Vac to the synchronous motor 12 is stopped.

  Then, a state signal indicating that the AC synchronous motor 12 has been stopped during lifting and lowering of the slat is output to the other device 21 due to overload (step 22), and the storage device indicates that the lifting and stopping position of the slat is halfway 22 and stored (step 20), and the lifting operation is finished.

  In step 16, when a pulse signal having no change in duty ratio is detected as the output signal Vo2, the process proceeds to step 23, and the duty ratios of the output signals Vo1 and Vo2 are compared. Then, when the output signal Vo2 is in the state shown in FIG. 6 with the output signal Vo1 in the state shown in FIG. 3, if (t1 / T)> (t / T), the AC synchronous motor 12 operates normally. Is detected, and the process proceeds to step 15 to repeat the operations of steps 15-23.

  At step 23, when the duty ratio of the output signals Vo1 and Vo2 does not satisfy (t1 / T)> (t / T), the process proceeds to step 24 to supply the AC power Vac from the drive circuit 14 to the AC synchronous motor 12. Shut off.

  Next, the phases of the output signals Vo1 and Vo2 are compared (step 25), and based on the comparison result, when the phases of the output signals Vo1 and Vo2 match, the rising limit switch 16 is nonconductive. The process moves from step 26 to step 27 after detection. Then, the corresponding state signal is output to the other device 21, and the fact that the slat has risen to the upper limit is stored in the storage device 22 (step 20), and the lifting operation is ended.

  Further, based on the comparison result in step 26, when the phases of the output signals Vo1 and Vo2 do not match, it is detected that the falling limit switch 17 is nonconductive, and the process proceeds from step 26 to step 28. A corresponding status signal is output to the other device 21, and the fact that the slat is lowered to the lower limit is stored in the storage device 22 (step 20), and the lifting operation is ended.

In the motor-driven horizontal blind control device 1 configured as described above, the following effects can be obtained.
(1) By comparing the voltage waveform of AC power supply Vac and the voltage waveform of the potential difference between the CW line and the CCW line of AC synchronous motor 12, the operating state of AC motor 12 and the elevating state of slat are determined. It can be detected.
(2) The voltage waveform of the AC power supply Vac is converted to a pulse signal by the first pulse conversion circuit 5, and the potential difference waveform between the CW line and the CCW line of the AC synchronous motor 12 is pulsed by the second pulse conversion circuit 18. Convert to a signal. Then, by comparing the output signals Vo1 and Vo2 of the first and second pulse conversion circuits 5 and 18, the operating state of the AC motor 12 and the elevating state of the slat can be detected.
(3) When the duty ratio of the output signal Vo2 is constant and the duty ratio of the output signals Vo1 and Vo2 is (t1 / T)> (t / T), it is detected that the AC synchronous motor 12 is rotating. be able to.
(4) When the phases of the output signals Vo1 and Vo2 are the same, it is possible to detect that the rising limit switch 16 is operating. Therefore, it is possible to detect a state where the slat is pulled up to the upper limit and the AC synchronous motor 12 is stopped.
(5) When the phases of the output signals Vo1 and Vo2 are different, it is possible to detect that the lowering limit switch 17 is operating. Therefore, it is possible to detect that the slat is lowered to the lower limit and the AC synchronous motor 12 is stopped.
(6) When the duty ratio of the output signal Vo2 fluctuates, it can be detected that the AC synchronous motor 12 is out of step due to overload. Then, the supply of the AC power supply Vac to the AC synchronous motor 12 can be stopped to avoid the step-out state of the AC synchronous motor 12.
(7) When no pulse signal is detected as the output signal Vo2, it is possible to detect the state in which the AC synchronous motor 12 is stopped by the operation of the thermal protection switch 23. Then, the supply of the AC power supply Vac to the AC synchronous motor 12 can be stopped to prevent useless power supply to the AC synchronous motor 12.
(8) Since the operation state of the AC synchronous motor 12 can be stored in the storage device 22, the AC synchronous motor 12 can be operated only when the operation of the operation switch 9 enables the AC synchronous motor 12 to operate. Can be supplied.
Second Embodiment
10 and 14 show a second embodiment. This embodiment shows a case where an AC induction motor is used instead of the AC synchronous motor 12 of the first embodiment. The configuration other than the motor is the same as that of the first embodiment.

The waveform of the output signal Vo2 of the photocoupler 19 when an AC induction motor is used is the same as that of the first embodiment except when an overload is applied to the motor.
When an overload is applied to the AC induction motor, as shown in FIG. 10, the level of the potential difference V1d between the CW line and the CCW line drops to a level substantially equal to that of the AC power supply Vac. Then, the duty ratio t4 / T of the output signal Vo2 of the photocoupler 19 becomes substantially equal to the duty ratio t / T of the output signal Vo1 of the photocoupler 8.

  Next, the operation of the control device 1 in the case of controlling the operation of the AC induction motor will be described. Since the operations from step 1 to step 15 shown in FIGS. 11 and 12 are the same as in the case of the AC induction motor, the operation following step 15 will be described according to FIG.

  If it is determined in step 41 following step 15 that a pulse signal can not be detected as the output signal Vo2, it is determined that the thermal protection switch 23 is not conducting and the supply of the AC power supply Vac to the AC induction motor is cut off. Migrate to 42.

  Next, at step 42, the supply of the AC power supply Vac from the drive circuit 14 to the AC induction motor is stopped. Then, a state signal indicating that the AC induction motor has been stopped during elevating of the slat is output to the other device 21 due to overheating of the AC induction motor (step 43), and the elevating end position of the slat is halfway up and down position Are stored in the storage unit 22 (step 44), and the lifting operation is ended.

  When a pulse signal is detected as the output signal Vo2 in step 41, the process proceeds to step 45 to compare the duty ratios of the output signals Vo1 and Vo2. When the output signal Vo2 is in the state shown in FIG. 6 with the output signal Vo1 in the state shown in FIG. 3, if (t1 / T)> (t / T), the AC induction motor is operating normally. To step 15, and repeat the operations of steps 15, 41 and 45.

  When the duty ratio of the output signals Vo1 and Vo2 does not satisfy (t1 / T)> (t / T) in step 45, the process proceeds to step 46 to supply the AC power supply Vac from the drive circuit 14 to the AC induction motor. Cut off.

  Next, it is determined whether the duty ratios of the output signals Vo1 and Vo2 match (step 47), and if they match, a status signal indicating that the AC induction motor has stopped during elevating of the slat due to overload is displayed The data is output to the device 21 (step 48). Then, the fact that the elevation stop position of the slat is the midway elevation position is stored in the storage unit 22 (step 44), and the elevation operation is ended.

  If the duty ratios do not match in step 47, the process proceeds to step 49, the phases of the output signals Vo1 and Vo2 are compared, and if the phases of the output signals Vo1 and Vo2 match, the rising limit switch 16 is not conductive Is detected, and the process proceeds from step 50 to step 51. Then, the corresponding status signal is output to the other device 21, and the fact that the slat has risen to the upper limit is stored in the storage device 22 (step 44), and the lifting operation is ended.

  Further, based on the comparison result in step 49, when the phases of the output signals Vo1 and Vo2 do not match, it is detected that the falling limit switch 17 is nonconductive, and the process proceeds from step 50 to step 52. A corresponding status signal is output to the other device 21, and the fact that the slat is lowered to the lower limit is stored in the storage device 22 (step 44), and the lifting operation is ended.

The control device of the electric horizontal blind configured as described above operates in the same manner as the first embodiment except for the process of determining whether the AC induction motor is overloaded. Therefore, the same effect as that of the first embodiment can be obtained.
Third Embodiment
15 to 17 show a third embodiment. The control device 29 of this embodiment includes the first and second pulse conversion circuits 5 and 18 and the photocouplers 8 and 19 of the first embodiment, the first and second voltage detection transformers 24 and 25, and The A / D conversion circuits 26 and 27 are substituted. The other configuration is the same as that of the first embodiment.

  The first and second voltage detection transformers 24 and 25 are provided as buffer circuits that eliminate the influence of the input impedance of the A / D conversion circuits 26 and 27 on the detection voltage input to the transformers 24 and 25.

  Specific configurations of the first voltage detection transformer 24 and the A / D conversion circuit 26 are shown in FIG. An alternating current power supply Vac is supplied to the primary side coil C1 of the first voltage detection transformer 24, and the alternating current power supply Vac is outputted from the output terminal of the secondary side coil C2.

  The output voltage of the secondary coil C2 is output to the input terminal of the A / D conversion circuit 26 via the buffer amplifier 28. The A / D conversion circuit 26 converts an analog voltage input to the input terminal into a digital signal and outputs the digital signal to the CPU 4 as an output signal Vo3.

  FIG. 17 shows the operation of the A / D conversion circuit 26. The voltage waveform of the AC power supply Vac is sampled at a predetermined sampling frequency, and the sampled voltage values are converted into digital values D1 to Dn and output to the CPU 4 as an output signal Vo3. The digital values D1 to Dn change periodically corresponding to the periodically changing voltage waveform of the AC power supply Vac.

  The second voltage detection transformer 25 and the A / D conversion circuit 27 have the same configuration as the first voltage detection transformer 24 and the A / D conversion circuit 26. The potential difference between the CW line and the CCW line of the AC synchronous motor 12 is input to the second voltage detection transformer 25 as an analog voltage signal.

Then, the A / D conversion circuit 27 outputs an output signal Vo4 obtained by converting the input analog voltage into a digital value to the CPU 4.
The operation of the control device 29 configured as described above is the same as the operation of the first embodiment except that the CPU 4 compares the output signals Vo3 and Vo4 of the A / D conversion circuits 26 and 27.

  The steps in which the operation and the process in the first embodiment are different will be described. In step 5, the phases of the output signals Vo3 and Vo4 are compared. At step 16, it is determined whether or not non-periodic fluctuation of the output signals Vo3 and Vo4 or the output signals Vo3 and Vo4 are input, and at step 23, the digital values D1 to Dn of the output signals Vo3 and Vo4 are compared, It is determined whether or not Vo4> Vo3.

By such an operation, in the control device 29 of this embodiment, the same function and effect as those of the control device 1 of the first embodiment can be obtained.
The above embodiment may be implemented in the following manner.
-Besides motorized horizontal blinds, the present invention can also be implemented as a control device such as a roller blind using an AC motor, an awning, a shutter, or a vertical blind.

  1, 29: Control device, 4: Detection means (CPU), 5: First pulse conversion circuit, 12: AC motor (AC synchronous motor), 16: First limit switch (rising limit switch), 17: No. Second limit switch (falling limit switch), 18 second pulse conversion circuit, 23 third limit switch (thermal protection switch), Vac alternating current power supply, V1a to V1c operation voltage.

Claims (8)

In an electric solar shading device that drives a shielding material by an AC motor,
A control device for detecting an operating state of the AC motor by comparing an AC power supplied to the AC motor with an operating voltage between a CW line and a CCW line of the AC motor; Electric sunshade device to do. The controller is
A first pulse conversion circuit that shapes the waveform of the AC power supply based on a preset threshold value;
A second pulse converter circuit for shaping the operating voltage based on the threshold value;
A detection means for detecting an operating state of the AC motor by comparing an output signal of the first pulse conversion circuit and an output signal of the second pulse conversion circuit is provided. Electric solar shading device.   The CW line of the AC motor interposes a first limit switch which becomes non-conductive when the shield is moved to one movement limit, and the CCW line of the AC motor has the other shield A second limit switch which is nonconductive when moved to the movement limit is interposed, and a third limit switch which is nonconductive due to the overheating of the AC motor is interposed in the COM line of the AC motor, The detection means compares the output signal of the first pulse conversion circuit with the output signal of the second pulse conversion circuit to detect the operating state of the AC motor and the moving position of the shielding member. The electric solar shading device according to claim 2.   An electric solar shading device comprising: an AC power supplied to an AC motor; and an operating voltage between the CW line and the CCW line of the AC motor, thereby detecting an operating state of the AC motor. Control method.   The AC power supply is waveform-shaped at a preset threshold to generate a first output signal, the operating voltage is waveform-shaped at the threshold to generate a second output signal, and the first output signal is generated. Comparing the phase of the second output signal with that of the second output signal, detecting the operating state of the limit switch interposed in the CW line and the limit switch interposed in the CCW line based on the comparison result; The control method of the electric solar shading device according to claim 4, wherein the movement position of is detected.   The AC power supply is waveform-shaped at a preset threshold to generate a first output signal, the operating voltage is waveform-shaped at the threshold to generate a second output signal, and the first output signal is generated. The electric solar shading device according to claim 4, wherein the duty ratio of the output signal of the second output signal is compared with that of the second output signal, and whether or not the AC motor is operating is detected based on the comparison result. Control method.   The AC power supply is waveform-shaped at a preset threshold to generate a first output signal, the operating voltage is waveform-shaped at the threshold to generate a second output signal, and the second output signal is generated. The electric motor according to claim 4, wherein it is detected whether or not the duty ratio of the output signal of the motor is constant, and whether or not the overload is acting on the AC motor based on the detection result. Control method of a solar radiation shielding device.   The AC power supply is waveform-shaped at a preset threshold to generate a first output signal, the operating voltage is waveform-shaped at the threshold to generate a second output signal, and the first output signal is generated. Detecting whether or not the duty ratio of the second output signal is the same as that of the second output signal, and detecting whether an overload is acting on the AC motor based on the detection result. The control method of the electric solar radiation shielding apparatus according to claim 4.