JPH0793086B2 - Removable outlet device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device with a removable power outlet that has a power supply switching relay that opens and closes a power supply. More specifically, the durability of a power supply switching relay (hereinafter simply referred to as a relay) is improved. The present invention relates to the configuration of the detachable outlet device.

Conventional technology In order to improve the durability of conventional relays, the excitation timing of the relay coil and the actual relay contact are opened and closed so that the relay contact is opened and closed near the zero voltage of the commercial power supply so that the inrush current is reduced. By learning the reaction time up to, the excitation timing of the relay coil can be determined, or the excitation timing (power supply phase) of the relay coil can be sequentially changed so that the relay contacts are not opened or closed at the timing when at least the highest voltage is concentrated. Ways have been done. A conventional relay drive type device will be described below with reference to the drawings. In FIG. 2, reference numeral 1 is a relay, 2 is a relay coil exciting means for operating contacts of the relay 1, 3 is a zero voltage detecting means for detecting a zero voltage of a commercial power source, and 4 is a zero voltage detecting means for detecting the zero voltage. The timing means 5 for measuring the time from the moment of the start of the excitation of the relay coil to the moment of the start of the excitation of the relay coil, 5 is to change the time from the moment when the voltage of the commercial power source reaches 0V to the moment of the start of the excitation of the relay coil in sequence with each excitation A counter for going, 6 is a switch for a user to input opening / closing of a power source, and 7 is a device configured by each element from the relay 1 to the switch 6.

Immediately after the start of energization, the counter 5 has a reset value. When the user operates the switch 6 to receive an input of a request for opening and closing the power source, after the time corresponding to the value indicated by the counter 5 is counted by the clocking means 4 after the zero voltage is detected, the excitation of the relay coil is started. . The contacts of the power on / off relay open and close after the reaction time from when the relay coil starts to be excited until when the relay actually opens and closes. Therefore, as the excitation timing (power supply phase) of the relay coil changes, The power-on phase or the power-off phase also changes. In this case, in this conventional case, the instruction of the counter 5 is advanced by one each time the relay coil is excited. Therefore, the excitation timing of the relay coil is sequentially changed, the power-on phase or the power-off phase of the power-supply open / close relay is also sequentially changed, and the power-supply open / close relay is never opened and closed at the same timing (power supply phase). In this way, wear of the relay contacts is prevented.

Problems to be Solved by the Invention However, when the relay control device having the above-described configuration is used in a device with an attachable / detachable outlet, the following problems arise. In the case of a device with a removable outlet, it may be used so that it is removed from the outlet after turning the power on and off only once after the power is turned on. In such a case, the number of times the relay coil is excited inevitably increases at the first timing after the start of energization. In other words, if it is used in this way, it does not meet the purpose of sequentially changing the excitation timing (power supply phase) of the relay coil so that the relay is not opened / closed concentrated at the timing with the highest voltage. Is. That is, the wear of the contacts of the power supply switching relay progresses, leading to a decrease in durability.

Therefore, the present invention solves the above-mentioned conventional problems. Even when the relay coil is used by being inserted into an outlet and then being turned on and off once and then removed from the outlet, the excitation timing of the relay coil (power supply phase ) Has changed, and the purpose is to provide an outlet detachable device in which the power supply switching relay is not opened and closed at least at the timing when the voltage is the highest.

Means for Solving the Problems In order to achieve the above object, a pluggable apparatus of the present invention has a power supply switching relay, a relay coil exciting means for contact operation of the power supply switching relay, and a zero voltage of a commercial power supply. Zero voltage detecting means for detecting, time measuring means for measuring the time from the moment of starting energization until the zero voltage is detected by the zero voltage detecting means, and the time counting for exciting the relay coil for the first time after starting energization. The calculation means determines the time from the moment when the commercial power source reaches zero voltage to the start of excitation of the relay coil using the time measured by the means as a parameter.

Operation The operation of this configuration will be described. First, the time measuring means measures the time from the moment the pluggable device is inserted into the outlet to start energization until the voltage of the commercial power source reaches zero voltage by the zero voltage detecting means. This time is a value depending on the timing of energization, and unless the circuit configuration of the pluggable device is special, it is considered that the time does not become a biased value. Next, when the power supply switching relay is opened and closed for the first time after the energization is started, the commercial power supply voltage reaches 0V with the parameter of the time measured from the moment when the energization is started by the timer to the moment when the zero voltage is detected. The calculation means determines the time from the moment when the relay coil is excited by the relay coil excitation means for relay contact operation, and the relay coil excitation means for contact operation waits for the excitation start time to start excitation. . In this way, the relay coil is excited at different timings every time, and the power supply switching relay is not opened and closed at least at the timing when the voltage is highest. As described above, the relay coil can be prevented from being worn even if it is used by being inserted into the outlet and then being turned on / off once after being energized and then removed from the outlet.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. The pluggable device 8 has a power source opening / closing relay 9, a relay coil exciting means 10 for operating contacts of the power source opening / closing relay 9, a zero voltage detecting means 11 for detecting a zero voltage of a commercial power source, and a zero voltage detecting from the moment of energization start. From the moment of detecting the zero voltage of the commercial power source by the zero voltage detecting means 11 to the moment of starting the excitation of the relay coil, the first timing means 12 for measuring the time until the moment when the zero voltage of the commercial power source is detected by the means 11. Operation means for determining the time from the moment when the voltage of the commercial power source reaches 0 V to the moment when the excitation of the relay coil is started, using the time measured by the second time measuring means 13 and the first time measuring means 12 as a parameter. 14, a counter 15 for sequentially changing the time from the moment when the commercial power supply voltage reaches 0 V to the moment when the relay coil starts to be excited, every time the magnet is excited. It consists of 16

The operation of this embodiment will be described below. When the user inserts the pluggable / unpluggable device 8 into the plugout and starts energizing, the first timing unit 12 detects the instant when the commercial power source reaches 0V by the zero voltage detecting unit 11 from the moment when the energization starts. Time to. This measured time is input to the calculation means 14, and the calculation means 14 corrects the lower several digits of this measured time as a parameter to a value in a range suitable for the counter 15, and sets the initial value in the counter 15. In this way, when the user operates the switch 16,
Excitation of the relay coil for the first time is started as follows. That is, the excitation of the relay coil is started at the moment when the time corresponding to the initial value of the counter 15 determined by the calculating means 14 has elapsed after the instant when the commercial power source reaches 0 V is detected by the zero voltage detecting means 11. It At the energization start timing after the second time, the initial value set in the above-mentioned first-time counter 15 is incremented by 1 by the counter 15 itself, and the excitation of the relay coil is started after waiting for this changed time. It is something. In this way, the timing of exciting the relay coil depends on the switch 16
Since the value set in the counter 15 changes each time the operation is performed, it becomes different every time.

As described above, the pluggable / unpluggable device according to the present embodiment is used even when it is used such that the power is turned on and off several times after being inserted into the outlet and then removed from the outlet. Does not change and the relay is not opened and closed concentratedly at least at the timing (power supply phase) corresponding to the fixed initial value of the counter 15, and it is possible to prevent wear of the contacts of the relay.

It should be noted that the first timing means 12, the second timing means 13 and the arithmetic means
It is also possible to realize the function of the counter 15 using a microcomputer.

Effects of the Invention As described above, the pluggable apparatus of the present invention is a power supply switching relay, a relay coil exciting means for contact operation of the power supply switching relay, a zero voltage detecting means for detecting a zero voltage of a commercial power supply, Time measuring means for measuring the time from the moment of energization start until the zero voltage is detected by the zero voltage detecting means,
When first exciting the relay coil after starting energization,
The time measured by the time measuring means is used as a parameter to determine the time from the moment when the commercial power source reaches zero voltage to the time when the excitation of the relay coil is started. Even if it is used after being turned on and off once and then unplugged from the outlet, the excitation timing of the relay coil will change, and at least the timing (power supply phase) that may have the highest voltage will be concentrated. Then, it provides an appropriate method for preventing the relay from being opened and closed, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example. 8: Removable outlet device, 9: Power switch relay,
10 …… Relay coil exciting means, 11 …… Zero voltage detecting means,
14 …… Calculation means.

Claims (1)

[Claims] 1. A power supply opening / closing relay, a relay coil exciting means for operating a contact of the power supply opening / closing relay, a zero voltage detecting means for detecting a zero voltage of a commercial power supply, and the zero voltage detecting means from the moment of starting energization. Timing means for measuring the time until the zero voltage is detected, and the moment when the commercial power source reaches the zero voltage with the time measured by the time measuring means as the parameter when the relay coil is first excited after the start of energization. To a plug-detachable device, which comprises a calculation means for determining the time from the start of excitation of the relay coil.