JP4026453B2 - Relay control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a relay control device that is used in an electric cooker or the like and controls load power.
[0002]
[Prior art]
In recent years, a control method has been proposed in which the switch means is opened and closed near the zero cross where the voltage value of the AC power supply is 0, thereby extending the operating life of the switch.
[0003]
Such a conventional relay control device will be described with reference to FIGS.
[0004]
FIG. 7 is a circuit block diagram of a conventional relay control device, FIG. 8 is an operation signal diagram thereof, in which 1 is an AC power source, 2 is a switch means, 3 is a load, and load 3 is an open / close switch 2 As a result, the AC power source 1 is cut off and energized to control the power.
[0005]
An open / close detection circuit 4 detects the phase of the AC power source 1 when the switch means 2 is opened / closed, and outputs a detection signal D. Reference numeral 5 denotes a synchronization signal generating circuit that outputs a synchronization signal B for each zero cross of the AC power supply 1.
[0006]
Reference numeral 31 is a control means comprising a microcomputer, and 34 is an opening / closing means for opening and closing the switch means 2 by an opening / closing signal C from the control means 31. (Not shown) is excited to open and close the switch means 2.
[0007]
Further, the timer means 32 of the control means 31 receives the synchronization signal B from the synchronization signal generating circuit 5 and the detection signal D from the open / close detection circuit 4, and the calculation update control means 33 obtains the synchronization signal B and the detection signal D. The relay controller is configured so as to calculate the time difference and control the open / close signal C to the open / close means 34 based on the calculation result to open and close the switch means 2 in the vicinity of the zero cross.
[0008]
The operation of turning on (closing operation) the switch means 2 in the above configuration will be described with reference to FIG.
[0009]
8A is a phase signal A of the AC power source 1, FIG. 8B is a synchronization signal B, FIG. 8C is an open / close signal C, and FIG. 8D is an operation signal diagram of the timer means 32. In the figure, timer means 32 starts measurement of time T0 from B1 of synchronizing signal B synchronized with zero cross A1 of AC power supply 1, and calculation update control means 33 has opening / closing signal at time TX stored in advance. C (in this case, an ON signal) is output (C1), the switching means 34 is closed, and the switch means 2 is turned on after time TY, the measurement is stopped (D1) by the detection signal D of the opening / closing detection circuit 4. The time T0 is determined.
[0010]
Then, the calculation update control means 33 calculates the time T0 and the half cycle T1 of the AC power source 1, and if they are not equal, the difference TZ between the time T0 and the half cycle T1 is added to the time TX and stored in advance. The time TX is updated as the new time TX, and the timer means 3 outputs the opening / closing signal C at the new time TX from the next time.
[0011]
Thus, the conventional relay control device corrects the time TX for outputting the switching signal C within the range of the half cycle T1 of the AC power supply 1 and controls the switching means 2 to open and close near the zero cross of the AC power supply 1. It was something to do.
[0012]
As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
[0013]
[Patent Document 1]
Japanese Patent Laid-Open No. 6-250746
[Problems to be solved by the invention]
However, in the above conventional relay control device, the operation time TY of the switch means 2 and the half cycle T1 of the AC power supply 1 are controlled in the relationship of T1> TY, so that, for example, an AC100V relay or the like can be controlled. In addition, it is impossible to control an electromagnetic switch using, for example, an AC120V relay or a thermal relay having an operation time TY of a half cycle T1 or more, and there is a problem that usable relays are limited.
[0015]
The present invention is to solve such a conventional problem, and can be opened and closed in the vicinity of the zero cross even when the operation time of the switch means is longer than a half cycle of the AC power supply. The purpose is to provide.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
[0017]
The invention according to claim 1 of the present invention corrects the change in phase of the AC power supply caused by the capacitor of the rectifier circuit by the phase correction means, so that the AC power supply can be operated even when the load to be opened and closed is capacitive. Thus, a signal synchronized with the zero cross can be obtained, and the opening and closing of the switch means can be reliably controlled in the vicinity of the zero cross.
[0018]
Further, the control means detects a time TA until the switching signal C is output from the zero cross of the AC power supply, a time TB from the opening / closing of the switch means to the immediately preceding zero cross, and a time TC until the immediately following zero cross, The relay control device is configured so as to correct TA by calculating TA, TB, TC, and can be controlled even if the operation time of the switch means is longer than a half cycle of the AC power supply. It has the effect that a wide relay control device can be obtained.
[0019]
According to a second aspect of the present invention, in the first aspect of the invention, a target value TS is provided from the opening and closing of the switch means to the zero crossing immediately thereafter, and the control means calculates the target value TS and each time of TA and TC. Thus, the TA is updated, and even when there is a large variation in the switching time of the switch means, it has the effect that it can be opened and closed with the target value TS to obtain a relay controller with stable operation.
[0020]
According to a third aspect of the present invention, in the first aspect of the invention, the number of zero crosses for counting the number of zero crosses from when the control means outputs an open / close signal to when the switch means is opened and closed, and for determining a pre-stored defect, Thus, the malfunction of the switch means is determined by the comparison, and it has an effect that processing such as malfunction cancellation can be performed.
[0021]
According to a fourth aspect of the present invention, in the third aspect of the present invention, a malfunction of the switch means is reported, and the user can be urged to perform maintenance.
[0022]
The invention according to claim 5 is the invention according to claim 1 , wherein the phase correction means is a resistor, and the resistor has a resistance value that easily corresponds to the AC voltage of each country, so that it is inexpensive. And it has the effect | action that it can respond to an alternating voltage which changes with countries.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0024]
In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of the prior art, and detailed description is simplified.
[0025]
(Embodiment 1)
The first and second aspects of the present invention will be described using the first embodiment.
[0026]
FIG. 1 is a circuit block diagram of a relay control device according to a first embodiment of the present invention, in which 1 is an AC power source, 2 is a switch means, 3 is a load such as a heater made of a resistor, The AC power supply 1 is cut off and energized to the load 3 by opening and closing the means 2 to control the power.
[0027]
Reference numeral 4 denotes an open / close detection circuit which is connected in parallel to the switch means 2 and detects the open / close of the switch means 2 and outputs a detection signal D to the control means 6.
[0028]
Reference numeral 5 denotes a synchronization signal generating circuit which outputs a synchronization signal B synchronized with the zero cross of the phase signal A of the AC power supply 1 to the control means 6.
[0029]
For example, when a cooking operation of an electric cooker (not shown) is performed, an electromagnet (not shown) is excited by an open / close signal C of the control means 6 to the coil by the relay of the open / close means 34, for example, a relay, etc. Then, by opening and closing the switch means 2, the load 3 can be controlled by electric power and can be cooked.
[0030]
The timer means 7 is connected to the second memory section 8, the third memory section 9, and the calculation update control means 10, respectively. The calculation update control means 10 has 12 timer connections. A fourth memory unit and an eleventh first memory unit are connected to each other.
[0031]
In the above configuration, an operation (closing operation) for turning on the switch means 2 according to the present embodiment will be described with reference to FIGS.
[0032]
2A is a phase signal A of the AC power source 1, FIG. 2B is a synchronization signal B, FIG. 2C is an open / close signal C, and FIG. 2D is an operation signal diagram of the timer means 7, In the figure, initially, the switch means 2 is in the open state, the AC power supply 1 is not applied to the load 3, and the time TA until the opening / closing signal C is output from the zero cross to the first memory unit 11. Is remembered.
[0033]
When the operation is performed and the load 3 is instructed to be energized, the timer means 7 starts counting the time TB10 with the synchronization signal B E02 synchronized with the zero cross of the AC power supply 1 of the synchronization signal generating circuit 5, When the time TA stored in the memory section 11 elapses, an opening / closing signal C (in this case, a closing signal) is output (c1) to the opening / closing means 34, and an electromagnet (not shown) is applied by energizing the coil with a relay of a relay, for example. And the switch means 2 is turned on after time TY.
[0034]
During this time, the timer means 7 calculates the previous time TB10 at E11 of the next synchronization signal B (indicating zero crossing of the AC power supply 1) during the time TY from the switching signal C1 to the switch means 2 being turned on. Reset and start counting the next time TB11.
[0035]
In this way, the timer means 7 repeats the counting operation for each zero cross of the AC power supply 1 until the switch means 2 is turned on. When the switch means 2 is turned on (c2), the time TB from the immediately preceding zero cross En1 to c2 is obtained. While being stored in the second memory unit 8, a time TC from c <b> 2 to En <b> 2 indicating the immediately following zero cross is determined and stored in the third memory unit 9.
[0036]
That is, the time TB is the time from the turning on of the switch means 2 to the immediately preceding zero cross, and the time TC is the time from the turning on of the switching means 2 to the immediately following zero cross.
[0037]
Then, the calculation update control means 10 calculates these times TA, TB, and TC. For example, if TA> TB, the difference between TA and TB, and if TA <TB, the sum of TA and TC is stored in the first memory unit 11. The new time TA is updated, and from this time on, the switch means 2 is turned on using this new time TA.
[0038]
3 (a) shows the phase signal A of the AC power source 1, FIG. 3 (c) shows the open / close signal C, and FIGS. 3 (d1), (d2) and (d3) show the operation signals 1 and 2 of the timer means 7, respectively. 3, these operation signals 1 to 3 indicate variations in the operation time of the switch means 2.
[0039]
FIG. 3 (d1) shows an example in which an ON signal is output (c1) to the switch means 2 after the time TA has passed due to the operation of the timer means 7, and the switch means 2 opens and closes (TB1) before the zero cross (d2). ) Shows a case where the switch means 2 is opened / closed slightly beyond the zero cross (TB2), and FIG. 4D3 shows a case where the switch means 2 is opened / closed greatly beyond the zero cross (TB3).
[0040]
For example, when the switch means 2 is turned on at half of the half cycle T1 of the AC power supply 1 due to variations in the operating time of the switch means 2 and frequency fluctuations of the AC power supply 1, the voltage of the AC power supply 1 is at a maximum and thus a large current. Flows and arc discharge occurs, and the switch means 2 is easily damaged.
[0041]
In order to prevent such damage to the switch means 2 and extend the operating life, in the present embodiment, a target value in which the operating time variation of the switch means 2 and the frequency fluctuation of the AC power supply 1 are added to the fourth memory unit 12. The time TS is stored.
[0042]
Then, the calculation update control means 10 includes the first memory unit 11 so that the times TC1, TC2, TC3 from the time TB1, TB2, TB3 when the switch means 2 opens and closes to the next zero cross always approach the target value TS. Next, the next new time TA is calculated and updated by the following relational expression.
[0043]
That is, in the case of FIG. 3 (d1), the next new time TA is set to TA + TC1-TS.
In the case of (d2) in the figure, the next new time TA is TA + TC2-TS.
In the case of (d3) in the figure, the next new time TA is TA + TC3-TS.
TC approaches the target value TS at the next new time TA.
[0044]
Thus, according to the present embodiment, the time TA until the control means 6 outputs the opening / closing signal C from the zero cross, the time TB from opening / closing of the switch means 2 to the immediately preceding zero cross, and the immediately following zero crossing. Since the time TC is detected and TA is corrected by calculating TA, TB, and TC, the switch means can be opened and closed in the vicinity of the zero cross even when the operating time of the switch means becomes longer than a half cycle of the AC power supply. Therefore, the relay controller that can be used can be obtained without limiting the relays that can be used.
[0045]
Further, the target value TS is provided from the opening and closing of the switch means 2 to the zero crossing immediately after it, and the time TA is updated by calculating the target value TS and each time of TA and TC, thereby opening and closing the switch means 2. A relay control device that can be opened and closed with the target value TS and that operates stably even when there is a variation in the operation time of the switch means 2 or a frequency variation of the AC power supply 1 can be obtained.
[0046]
In the above description, the operation for turning on the switch means 2 (closing operation) has been described. However, for the operation for turning off (opening operation), the time TA for turning off is stored in the first memory unit 11. The present invention can be implemented by outputting the opening / closing signal C (in this case, the opening signal) from the timer means 7 and performing similar control.
[0047]
(Embodiment 2)
The second and second embodiments of the present invention will be described with reference to the second embodiment.
[0048]
In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure of Embodiment 1, and detailed description is simplified.
[0049]
FIG. 4 is a circuit block diagram of the relay control device according to the second embodiment of the present invention. In FIG. 4, the control means 6 is provided with 13 counting units connected to the synchronization signal generating circuit 5, The defect determination unit 14 is connected to the count unit 13, and a count number input unit 15 is connected to the defect determination unit 14, and the count number input unit 15 includes the switch means 2 previously determined by experiments or the like. The count number as a defect is stored.
[0050]
Furthermore, 16 failure status memories are connected to the failure determination unit 14, and 17 notification means are connected to the failure status memory 16 to constitute a relay control device.
[0051]
Other configurations are the same as those in the first embodiment.
[0052]
In the above configuration, the count unit 13 counts the synchronization signal B (zero cross of the AC power supply 1) from when the open / close signal C is output to when the detection signal D is input, and transmits it to the failure determination unit 14. .
[0053]
The failure determination unit 14 determines that the switch unit 2 is defective when the switching operation of the switch unit 2 is hindered and the count number of the count unit 13 is equal to or greater than the count number of the count number input unit 15. For example, if the switch means 2 is in a closed state, the control means 6 outputs an impact pulse signal (for example, a short cycle ON / OFF repeat signal) to the open / close means 34 to open the switch means 2. After that, processing such as operation stop is performed.
[0054]
In addition, by storing the failure determination of the failure determination unit 14 in the failure state memory 16, it is possible to prevent re-operation after the operation of the switch unit 2 is stopped, and to operate the notification unit 17 such as a buzzer from the failure state memory 16. Thus, the user is notified of the malfunction of the switch means 2.
[0055]
As described above, according to the present embodiment, by counting the number of zero crosses from when the open / close signal is output to the switch means 2 to when the switch is opened and closed, and determining the malfunction of the switch means by comparison with the number of zero crosses stored in advance. Therefore, it is possible to obtain a relay control device that performs processing such as operation stop.
[0056]
Furthermore, when it is determined that the switch means 2 is defective, it is possible to notify the user and promptly prompt the user to maintain the relay control device.
[0057]
(Embodiment 3)
With the third embodiment will be described in particular the invention of claim 5 Symbol mounting of the present invention.
[0058]
In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure of Embodiment 1 and 2, and detailed description is simplified.
[0059]
FIG. 5 is a circuit block diagram of the relay control device according to the third embodiment of the present invention. In the figure, 21 is a phase correction means comprising a resistor, and is connected in parallel to the primary side of 22 rectifiers. The load 3 is connected to a rectifier circuit 24 composed of a rectifier 22 that rectifies the AC power supply 1 and a capacitor 23 that smoothes the rectified waveform rectified by the rectifier 22 to constitute a relay control device.
[0060]
Here, the load 3 is an electronic circuit or an electronic device such as a fluorescent lamp electronic ballast that operates with a DC voltage obtained by rectifying and smoothing the AC power source 1 using the rectifying circuit 24.
[0061]
In the above configuration, the operation (closing operation) for turning on the switch means 2 is the same as that in the first embodiment, and therefore detailed description is omitted, and the phase signal diagram of FIG. It explains using.
[0062]
In the figure, when the switch means 2 is turned on, the phase signal A of the AC power source 1 in FIG. 9A is affected by the capacitance of the capacitor 23 as shown in FIG. The phase changes.
[0063]
Then, the phase correction means 21 corrects the change in the phase of the AC power supply 1 so as to return it to the original phase signal as shown in FIG.
[0064]
Therefore, even if the switch means 2 is turned on / off, the phase signal A of the AC power supply 1 does not change, and the synchronization signal B synchronized with the zero cross of the AC power supply 1 is obtained, and the switch means 2 is controlled near the zero cross. A relay control device that can be obtained can be obtained.
[0065]
In the phase signal A in FIG. 5B, the magnitude of the phase fluctuation increases as the capacitance value increases according to the capacitance value of the capacitor 23 such that b1> b2.
[0066]
The resistance value of the phase correction means 21 is set to 100 kΩ for 100 V and 200 kΩ for 200 V so as to correspond to the AC voltage of the AC power supply 1 in each country.
[0067]
Thus, according to the present embodiment, the phase of the phase signal A does not fluctuate even if the load that the switch means 2 opens and closes by the phase correction means 21 is capacitive. A relay control device that can be reliably opened and closed near zero volts can be obtained.
[0068]
In addition, by using the phase correction means 21 as a resistor, it is possible to obtain a relay control device that can easily cope with various voltages in each country simply by changing to a resistance value corresponding to the AC voltage in each country.
[0069]
【The invention's effect】
As described above, according to the present invention, the phase correction means corrects the change in the phase of the AC power supply due to the capacitor of the rectifier circuit, so that even if the load to be opened or closed is capacitive, the zero crossing of the AC power supply Can be obtained, and the opening and closing of the switch means can be reliably controlled in the vicinity of the zero cross. Further, the time TA until the control means outputs the opening / closing signal C from the zero cross of the AC power source to the opening / closing means, the time TB until opening / closing of the switch means and the zero cross just before, and the time TC until the zero cross just after this By detecting TA and correcting TA using TA, TB, and TC, even if the switch means 2 operation time is longer than a half cycle of the AC power supply, it is possible to open and close near the zero cross, and a versatile relay control device. The advantageous effect that it can be obtained is obtained.
[Brief description of the drawings]
FIG. 1 is a circuit block diagram of a relay control device according to a first embodiment of the present invention. FIG. 2 is an operation signal diagram. FIG. 3 is an operation signal diagram according to another embodiment. FIG. 5 is a circuit block diagram of a relay control device according to a third embodiment of the present invention. FIG. 6 is a phase signal diagram of the relay control device according to a third embodiment of the present invention. Circuit block diagram of control device [Fig. 8] Operation signal diagram [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 AC power supply 2 Switch means 3 Load 4 Opening / closing detection circuit 5 Synchronization signal generation circuit 6 Control means 7 Timer means 8 Second memory part 9 Third memory part 10 Calculation update control means 11 First memory part 12 4th Memory part 21 Phase correction means 22 Rectifier 23 Capacitor 24 Rectifier circuit 34 Opening / closing means

Claims (5)

A rectifier circuit is connected to the AC power supply via a switching means, and a load is connected to the rectifier circuit and connected in parallel to the primary side of the rectifier circuit to correct a change in phase of the AC power supply due to the capacitor of the rectifier circuit. Phase correction means, synchronization signal generation circuit for generating a signal synchronized with the zero cross of the AC power supply, control means connected to the synchronization signal generation circuit, and opening / closing of the switch means operated by an opening / closing signal of the control means It comprises an open / close detection circuit for detecting a state, and the time TA until the control means outputs the open / close signal from the zero cross, the time TB from the open / close of the switch means to the immediately preceding zero cross, and the immediately following zero cross A relay control device that detects the time TC of the time, calculates the TA, TB, TC and corrects the TA.   2. The relay control device according to claim 1, wherein a time TS of a target value from the opening / closing of the switch means to the immediately following zero crossing is provided, and the control means calculates the time TS and TA, TC to correct the TA.   The control means is provided with a counting section for counting zero crosses from the output of the open / close signal to the detection of the opening / closing of the switch means, and a failure determination section for determining the failure of the switch means, and determining the failure of the switch means Item 15. The relay control device according to Item 1.   4. The relay control device according to claim 3, further comprising notification means for notifying a malfunction of the switch means. Relay control apparatus according to claim 1, wherein the phase correction means and the resistor.

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