JPH064170A - Controller - Google Patents

Abstract

PURPOSE:To apply control with high accuracy and high efficiency without using the interrupt function of a microcomputer by reading in the output of time measurement initialized repeatedly and restarted by a timing pulse signal, and correcting a control timing corresponding to a read in value. CONSTITUTION:The microcomputer 10 is programmed so as to check an input port I1 for at least one time in the period of low level of a zero cross signal. When the input port I1 is checked in the period of low level, the output of an operational amplifier 32 at that time is read in from the analog input AN2 of the microcomputer 10. A value corrected according to the read in value is set on a timer incorporated in the microcomputer, and a trigger pulse is outputted from an output port O1 when time is up, and the ignition control of a triac 8 is performed by driving a transistor 11. In such a way, since a timer value is set by applying appropriate correction, phase control can be performed with high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device which supplies a timing pulse signal to a microcomputer and the microcomputer controls in synchronization with the timing pulse.

[0002]

2. Description of the Related Art Conventionally, in a control device of this kind, when the synchronization accuracy of control with respect to a timing pulse signal is required, the timing pulse is input to an interrupt terminal of a microcomputer so that the priority of processing is Was raised to correspond.

When a microcomputer without an interrupt terminal or an interrupt terminal is used for other purposes, a timing pulse signal is input to a normal port,
The program was configured to constantly monitor the port.

[0004]

However, in the conventional configuration in which the port is constantly monitored, the processing of the microcomputer is spent for monitoring, and other processing cannot be executed. There was a problem of reduced efficiency.

Therefore, in view of the above points, an object of the present invention is to provide a control device which enables highly accurate and efficient control without using the interrupt function of a microcomputer.

[0006]

In order to achieve the above object, the present invention is a control device including a microcomputer for inputting a timing pulse and performing control in synchronization with the timing pulse, which is repeated by the timing pulse signal. It has a time measuring unit that is initialized and restarted, and a control unit that reads the measurement output of the time measuring unit and corrects the control timing according to the measured output value.

According to another aspect of the present invention, a timing pulse is input and control is performed in synchronization with the timing pulse.
In a control device including a microcomputer, a time measurement unit that is repeatedly initialized and restarted by the timing pulse signal, and a setting that reads the measurement output of the time measurement unit and semi-fixedly inputs the measurement output value from the outside. And control means for correcting the control timing according to the value.

[0008]

In the present invention, the measurement output from the time measuring means which is repeatedly initialized and restarted by the timing pulse signal is read, and the control timing is corrected according to the read value.

Further, in another aspect of the present invention, the measurement output from the time measuring means which is repeatedly initialized and restarted by the timing pulse signal is read, and the read value and another semi-fixed set value are input. The control timing is corrected accordingly.

[0010]

EXAMPLES Examples of the present invention will be described in detail below.

Embodiment 1 FIG. 1 is a diagram for explaining a technique as a premise for explaining an embodiment of the present invention. In each of the embodiments of the present invention, the lamp control circuit 6 has a characteristic, but in this figure, a general lamp control circuit is shown for convenience of the following description.

In FIG. 1, reference numeral 1 is a plug for connecting to an outlet of a commercial power source. 2 is a current fuse as a safety device, 3 is a noise filter, and 4 is a power switch. 5 is a DC power supply circuit, which is +5 from the commercial power supply.
Vdc and ± 12 Vdc are supplied to the lamp control circuit 6. The lamp control circuit 6 is ON / OFF-controlled by an external control signal, and the lighting voltage is also controlled.

7 is a halogen lamp, 8 is a triac,
Reference numeral 9 is a trigger circuit. 10 is a microcomputer,
Reference numeral 11 is a transistor for driving the trigger circuit.

Next, the operation will be described. The AC voltage supplied from the plug 1 is supplied to both ends of the halogen lamp 7 and the triac 8 through the fuse 2, the noise filter 3 and the power switch 4.

The microcomputer 10 has an ON / OFF signal input to the input port I ₂ and an analog input (input of the microcomputer built-in A / D converter).
According to the control voltage command signal inputted to AN _1, a program for outputting a trigger timing pulse for phase control in synchronism with the zero-cross signal which is input to the input port I ₁ from the output port O ₁ is built-in ROM Is written in.

Output port O of the microcomputer 10
_The pulse output from ₁ drives the transistor 11, the trigger circuit 9 triggers the triac 8, and a voltage is applied to the halogen lamp 7.

FIG. 2 is a diagram for explaining the timing for triggering the triac 8. 21 in this figure
Is an AC waveform supplied from the plug 1. 22 is
It is an output waveform of the zero-cross detection circuit built in the DC power supply 5. This waveform has a low level period of a predetermined width across the zero cross timing of the AC waveform 21. 23 is the trailing edge of the zero-cross waveform 22,
It is a waveform of a trigger pulse output after a predetermined time calculated by the microcomputer 10.

Reference numeral 24 shows the waveform of the voltage applied to the halogen lamp 7 by the ignition of the triac 8. Thus, controlling the effective voltage applied to the load by changing the output timing of the trigger pulse 23 from the trailing edge of the zero-cross waveform 22 is known as phase control. At this time, in order to accurately obtain a desired effective voltage, it is necessary to accurately detect the falling edge of the zero-cross waveform and accurately control the output timing of the trigger pulse.

For this reason, conventionally, a zero-cross signal is input to an interrupt terminal of a microcomputer, detected accurately, a value according to the output timing is set in a timer built in the microcomputer, and a trigger output is performed after the time is up. Was designed to. However, in general, the interrupt pin of the microcomputer is limited, and it is recommended to use the interrupt pin when it is used for other purposes or when the microcomputer performs important timing processing in parallel. There are times when you want to avoid it. In such a case, the zero-cross signal will be connected to a normal input port.

In this case, in order to accurately detect the falling edge of the zero-cross waveform, the port must be frequently monitored by software. Therefore, when important timing processing is performed in parallel, designing under conditions that satisfy each other becomes a problem in software design, narrowing the degree of freedom in design, and to some extent. You will have to admit the timing delay. However, since this delay directly affects the accuracy of the effective voltage, in order to be able to deal with the case where the accuracy is required, in this embodiment described in detail below, a means for correcting the delay of the detection timing is provided. It was added. The details will be described below.

FIG. 3 is a diagram showing an internal circuit of the lamp control circuit 6 according to one embodiment of the present invention. In this figure, 6
Is the entire lamp control circuit, 10 is a microcomputer,
Reference numeral 11 is a pulse driving transistor, 31 is a transistor that is turned on in a high section of the zero-cross waveform, 32 is an operational amplifier forming an integrating circuit, and 33 is an adjusting volume.

Next, the operation of the lamp control circuit 6 will be described. While the high-level section of the zero-cross signal is being input to the input port I ₁ , the transistor 31 is in the ON state, and the output of the operational amplifier 32 is fixed near 0V. As the zero-cross signal goes low, the output of the op amp begins an approximately monotonic increase.

The microcomputer 10 is programmed to check the input port I ₁ at least once during a low level period of the zero-cross signal (for example, 1 ms), and if it is low when the port is checked,
The output of the operational amplifier at that time is read from the analog input AN ₂ of the microcomputer, and the value corrected according to the read value is set in the timer built in the microcomputer. When the time is up, a trigger pulse is output from the output port O ₁
And the triac 8 is ignition controlled.

According to this configuration, if a program is created so that the input port I ₁ is checked at least once in the low period of the zero-cross signal, the delay amount from the actual falling of the zero-cross signal is input to the analog input AN ₂ Can be known from the value of, and by adding an appropriate correction and setting the timer value, it is possible to realize highly accurate phase control.

The volume 33 is an adjustment volume for correcting the zero-cross pulse width in each control device, and the value of the analog input AN ₂ is corrected in accordance with the read value of AN ₃ inside the microcomputer. It is for. Note that the analog input AN ₁ is inputted with an analog voltage for instructing a target value of the effective output voltage, and the input port I ₂ is inputted with a signal for instructing ON / OFF of the lamp.

FIG. 4 shows the waveform of each part of the embodiment shown in FIG. Here, 41 is the input waveform of the commercial power source input to the power plug, and 42 is the waveform of the zero-cross signal generated by the DC power source 5. Reference numeral 43 is an output waveform of the operational amplifier 32 shown in FIG. 3, and shows a waveform input to the analog input AN ₂ of the microcomputer 10.

FIG. 5 shows an operational amplifier 3 which constitutes an integrating circuit.
It is a figure which shows the output characteristic of No. 2. When the zero-cross signal changes from high level to low level, the transistor 3
1 is turned off, and the output of the operational amplifier 32 is set to start monotonically increasing almost linearly.

FIG. 6 shows output characteristics when the zero-cross signal changes from low level to high level. At this time, the transistor 31 is turned from OFF to ON, and the output of the operational amplifier is temporarily reduced according to the characteristics of the discharge circuit.

FIG. 7 is a flow chart showing a program built in the microcomputer 10 of this embodiment.

First, starting from step S1 (hereinafter, the word "step" is omitted), various registers, ports and RAM are initialized in step S2. I in S3
₂ ports are read to determine whether the lamp lighting signal is ON, and if it is ON, the process proceeds to S4 to obtain the AD conversion value (CNTL) indicating the control target value from AN ₁ .

Next, in step S5, the port I ₁ is read, and it is determined whether the level of the zero-cross signal is high level. If yes, the process returns to step S3. If not, the output (DLY) of the integrating circuit is set to AN in step S6. Read from ₂ .

Next, in S7, the adjustment value ADJ of the volume 33 is read from AN ₃ .

Next, in S8, the value of DLY and ADJ
A predetermined table is searched from the value of to obtain the correction amount DLT.

Next, in S9, a table search is performed from the values of CNTL and DLT, the value RSLT is set in the internal timer, and TFLAG indicating that the trigger pulse 23 is waiting to rise is set to 1.

Next, in step S10, the port I ₁ is monitored and looped until the zero cross signal becomes high level.
When the level becomes high, the process returns to S3. If the lighting signal is OFF in S3, the process proceeds to S11, the internal timer is reset (stopped), and a low level is output to the port O _{1 of the} trigger signal (S12).

FIG. 8 is a flowchart of the interrupt program. When an interrupt is generated by the internal timer,
The process starts from S801.

First, in S802, TFLAG is set to 1
If it is not set, the port O ₁ of the trigger pulse output is turned off (low level) in S807, the flow exits from S806, and the interrupt processing is ended.

If TFLAG is set in step S802, the trigger pulse output port O ₁ is turned ON (high level) in step S803, and TFLAG is set in step S804.
G is reset to 0, a timer value corresponding to the width of the trigger pulse is set in the internal timer in S805, the timer is restarted, the processing is exited from S806, and the interrupt processing is ended.

Embodiment 2 FIG. 9 is a diagram showing the internal circuit of the lamp control circuit 6 according to the second embodiment. In the figure, 6 is the entire lamp control circuit, 10 is a microcomputer, and 11 is a pulse driving transistor. Reference numeral 91 is a counter that is reset during a high level period of the zero-cross signal and counts clock pulses output by the microcomputer 10 during a low level period.
0 are connected in parallel to 8-bit input ports I _{15 to} I ₈ . Reference numeral 33 is a volume for adjustment.

Next, the operation of the lamp control circuit will be described. While the high level section of the zero-cross signal is being input to the input port I ₁ , the counter 91 is reset and becomes low level and starts counting up.

The microcomputer 10 is programmed to check the input port I ₁ at least once during the low level period of the zero-cross signal (for example, 1 ms), and if it is low when the port is checked,
The counter value at that time is read from the port, the value corrected according to the read value is set in the timer built into the microcomputer, and when the time is up, a trigger pulse is output from the output port O ₁ and the triac 8 is controlled to fire. To be done.

According to this configuration, the program is created so as to check the input port I ₁ at least once during the low period of the zero-cross signal, so that the delay amount from the actual zero-cross falling edge can be corrected by the port I ₁₅ It is possible to know from the values of I ₈ and it is possible to realize highly accurate phase control by setting the timer value by adding an appropriate correction.

The volume 33 is an adjustment volume for correcting the zero-cross pulse width in each control device, and is for correcting the reading value of the counter in the microcomputer according to the reading value of AN _3. is there. The analog voltage for commanding a target value of the effective output voltage to AN ₁ is a lamp to an input port of I ₂ O
A signal for instructing N / OFF is input.

Next, the operation of the program contained in the microcomputer 10 of the second embodiment will be described using the flowchart shown in 10.

Starting from S21, various registers, ports and RAM are initialized in S22. In S23, the I ₂ port is read to determine whether the lamp lighting signal is ON. If it is ON, the process proceeds to S24 to obtain an AD conversion value (CNTL) indicating a control target value from AN ₁ .

Next, in step S25, the port I ₁ is read to determine whether the level of the zero-cross signal is high level. If yes, the process returns to step S23, and if not, step S26
At, the output (DLY) of the counter 91 is read from the 8-bit parallel input of the ports I _{15 to} I ₈ .

Next, in S27, the adjustment value ADJ of the volume 33 is read from AN ₃ . Next, in S28, a predetermined table is searched from the value of DLY and the value of ADJ to obtain the correction amount DLT.

Next, in S29, a table search is performed from the values of CNTL and DLT, the value RSLT is set in the internal timer, and TFLAG indicating that the trigger pulse 23 is waiting for the rising edge is set to 1.

Then, in step S30, the port I ₁ is monitored and looped until the zero-cross signal becomes high level.
When the level becomes high, the process returns to S23.

If the lighting signal is OFF in S23, the process proceeds to S31 to reset (stop) the internal timer.
Then, a low level is output to the port O ₁ of the trigger signal (S12).

The interrupt program is executed as shown in FIG. That is, when an interrupt is generated by the internal timer, the process starts from S801.

First, in S802, TFLAG is set to 1
If it is not set, the port O ₁ of the trigger pulse output is turned off (low level) in S807, the flow exits from S806, and the interrupt processing is ended.

If TFLAG is set in step S802, the trigger pulse output port O ₁ is turned ON (high level) in step S803, and TFLAG is set in step S804.
G is reset to 0, a timer value corresponding to the width of the trigger pulse is set in the internal timer in S805, the timer is restarted, the processing is exited from S806, and the interrupt processing is ended.

Third Embodiment FIG. 11 is a diagram showing the internal circuit of the lamp control circuit 6 according to the third embodiment. In the figure, 6 is the entire lamp control circuit, 10 is a microcomputer, and 11 is a pulse driving transistor. Reference numeral 91 is a counter that is reset during a high level period of the zero-cross signal and counts clock pulses output by the microcomputer 10 during a low level period. The output is an 8-bit input of I _{15 to} I ₈ of the microcomputer 10. Connected in parallel to the port.

Next, the operation of the lamp control circuit will be described. While the high level section of the zero-cross signal is being input to the input port I ₁ , the counter 91 is reset and becomes low level and starts counting up.

The microcomputer 10 is programmed to check the input port I ₁ at least once during the low level period of the zero-cross signal (for example, 1 ms), and if it is low when the port is checked,
The counter value at that time is read from the port, the value corrected according to the read value is set in the timer built into the microcomputer, and when the time is up, a trigger pulse is output from the output port O ₁ and the triac 8 is controlled to fire. To be done.

According to this configuration, the program is created so that the input port I ₁ is checked at least once in the low period of the zero-cross signal, so that the delay amount from the actual fall of the zero-cross signal can be adjusted to the port I ₁₅ It is possible to know from the values of I ₈ and it is possible to realize highly accurate phase control by setting the timer value by adding an appropriate correction.

The adjustment value ADJ for correcting the zero-cross pulse width in each control device is sent by serial communication from a control device (not shown) outside the lamp control circuit 6, and is Inside the computer, the reading value of the counter is corrected according to the SO, SI and SCK signals. An analog voltage that commands the target value of the effective output voltage is input to AN ₁ , and a signal that commands ON / OFF of the lamp is input to the I ₂ input port.

Next, the operation of the program contained in the microcomputer 10 of the third embodiment will be described with reference to the flow chart shown in FIG.

Starting from S41, various registers, ports and RAM are initialized in S42. In S43, the I ₂ port is read to determine whether the lamp lighting signal is ON. If it is ON, the process proceeds to S44 to obtain the AD conversion value (CNTL) indicating the control target value from AN ₁ .

Next, in step S45, the port I ₁ is read to determine whether the level of the zero-cross signal is high level. If yes, the process returns to step S43, and if not, step S46
At, the output (DLY) of the counter 91 is read from the 8-bit parallel input of the ports I _{15 to} I ₈ .

Next, in S47, the adjustment value ADJ is taken out from the communication buffer inside the microcomputer.

Next, in S48, the value of DLY and AD
A correction table DLT is obtained by searching a predetermined table from the value of J.

Next, in S49, a table search is performed from the values of CNTL and DLT, the value RSLT is set in the internal timer, and TFLAG indicating that the rising of the trigger pulse 23 is waited is set to 1.

Next, in step S50, the port I ₁ is monitored and looped until the zero-cross signal becomes high level.
When the level becomes high, the process returns to S43.

If the lighting signal is OFF in S43, the process proceeds to S51 to reset (stop) the internal timer.
Then, a low level is output to the port O ₁ of the trigger signal (S52).

The interrupt program is executed as shown in FIG. That is, when an interrupt is generated by the internal timer, the process starts from S801.

First, in S802, TFLAG is 1
If it is not set, the port O ₁ of the trigger pulse output is turned off (low level) in S807, the flow exits from S806, and the interrupt processing is ended.

If TFLAG is set in step S802, the trigger pulse output port O ₁ is turned ON (high level) in step S803, and TFLAG is set in step S804.
G is reset to 0, a timer value corresponding to the width of the trigger pulse is set in the internal timer in S805, the timer is restarted, the processing is exited from S806, and the interrupt processing is ended.

[0070]

As described above, according to the present invention, since the control timing is corrected, it is possible to realize highly accurate control with a simple additional circuit without using the interrupt function of the microcomputer.

[Brief description of drawings]

FIG. 1 is a diagram showing a prerequisite technique for explaining an embodiment of the present invention.

FIG. 2 is a waveform diagram showing the operation of FIG.

FIG. 3 is a circuit diagram showing a first embodiment of the present invention.

FIG. 4 is a waveform diagram showing the operation of FIG.

5 is a diagram showing the operating characteristics of FIG. 3. FIG.

FIG. 6 is a diagram showing the operating characteristics of FIG.

FIG. 7 is a flowchart showing an operation procedure of the first embodiment shown in FIG.

FIG. 8 is a flowchart showing interrupt processing.

FIG. 9 is a circuit diagram showing a second embodiment of the present invention.

10 is a flowchart showing an operation procedure of the second embodiment shown in FIG.

FIG. 11 is a circuit diagram showing a third embodiment of the present invention.

FIG. 12 is a flowchart showing an operation procedure of the third embodiment shown in FIG.

[Explanation of symbols]

 1 Plug 2 Current Fuse 3 Noise Filter 4 Power Switch 5 DC Power Circuit 6 Lamp Control Circuit 7 Halogen Lamp 8 Triac 9 Trigger Circuit 10 Microcomputer

Claims (3)

[Claims] 1. A control device including a microcomputer, which receives a timing pulse and performs control in synchronization with the timing pulse, comprising: a time measuring unit that is repeatedly initialized and restarted by the timing pulse signal; and the time measuring unit. And a control means for correcting the control timing according to the measured output value. 2. The control device according to claim 1, wherein the input of the timing pulse is checked at least once while the timing pulse exhibits a low level or a high level. 3. A control device including a microcomputer for inputting a timing pulse and performing control in synchronism with the timing pulse, comprising: time measuring means repeatedly initialized and restarted by the timing pulse signal; and the time measuring means. And a control means for correcting the control timing according to the measured output value and a set value semi-fixedly input from the outside.