JPS61142989A - Momentary power interruption backup controller of motor controller - Google Patents

Abstract

PURPOSE:To stably continue the operation of a motor at momentary power interruption time by continuing the operation before the power interruption in case of the momentary power interruption. CONSTITUTION:When a power source is turned ON, a power source monitor 37 is operated to output a reset signal 38 to a microprocessor 31. The microprocessor 31 reads out a timer 33, and judges whether it is a momentary power interruption or not by the power interruption period from the power interruption to the recovery of the power interruption by a signal 39 from the monitor 37. In case of the momentary power interruption, a control program is immediately restarted by the present control data. When judging not the momentary power interruption but the long term power interruption, the control data of a memory 32 is cleared, again initialized, and the control program is then restarted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an instantaneous power outage backup control circuit for a motor control device that detects an instantaneous power outage and performs a backup operation.

[Technical background of the invention and its problems]

Fig. 6 shows the general configuration of a conventional motor control device, in which 1 is a power transformer for the main circuit, 2 is a magnetic force converter, and 3 is a power transformer for the main circuit.
is an electric motor, and is controlled by a control circuit 4 (==) to which control power is supplied from a control power supply circuit 5.

When a power outage occurs, the input power to the magnetic force converter 2 is lost, and therefore its output is also lost, causing the electric motor 3 to decelerate and eventually stop.

However, in the case of an instantaneous power outage in which the power outage recovers instantaneously (=, the speed of the magnetic af!A3 hardly changes, so there is a demand for continued operation.

For this reason, it is necessary for the control circuit 4 to continue the control operation, and conventionally, as shown in FIG. 7, a (- capacitor is used to hold the control voltage.

In other words, 51 is the power transformer for the control circuit, 52 is the rectifier, 53 is the voltage control circuit, and 54 is the capacitor. The control operation is continued while maintaining the output of the control circuit 53 within the required control voltage range, and the operation of the TU+iA3 is continued at the same time as the power is restored.

However, the control power supply circuit shown in FIG. 7 requires a relatively large capacity capacitor, which increases the scale of the control circuit; this not only increases the size and weight but also causes problems in terms of cost.

[Purpose of the invention]

The present invention provides an instantaneous power outage backup control circuit for a motor control device that, when power is restored after a power outage occurs, determines whether this was an instantaneous power outage or a long-term power outage, and in the case of an instantaneous power outage, continues operation as before the power outage. is intended to provide.

[Summary of the invention]

The present invention includes an instantaneous power outage detection circuit that determines whether it is an instantaneous power outage or a long-term power outage based on the time ζ2 from when a power outage occurs until the power is restored, and a memory (= battery that supplies power) and a battery that supplies power even in the event of a power outage. When recovered, in the event of a momentary power outage, the program will be restarted using the control data stored in the memory, and in the event of a long-term power outage, the control data stored in the memory will be cleared, initialized again, and the program will be restarted. This is an instantaneous power outage backup control circuit for a motor control device that uses a small, small-capacity battery and a simple circuit to allow the machine to continue operating as scheduled during an instantaneous power outage.

[Embodiments of the invention]

An embodiment of the present invention is shown in FIG.

In FIG. 1, 31 is a microprocessor that is the center of the control circuit 4, 32 is a memory that stores control programs and control data, ``A'' is a timer that counts the stop IL time, ``A'' is an input/output circuit, ``A'' is a memory n and timer 33
4 = battery that constantly supplies power, 37 is control circuit Nr4
This is a power supply monitor circuit that detects whether there is a power outage or not.

Figure 1: When the power is turned on, the power monitor 37
operates and outputs a reset signal A to the microprocessor 31, which then starts processing operation.

FIG. 2 is a flowchart showing the processing procedure of the microprocessor 31.

That is, first, in step 1, the control data is initialized.
Next, in step 2, read the timer and power monitor 3.
A signal 39 from 7 is used to count the power outage period from when a power outage occurs until the power outage is restored, and determine whether or not it is a momentary power outage.

In the event of a momentary power outage, immediately move to step (4) and restart the control program using the current control data.

It is a momentary power outage (if it is determined to be a long-term power outage, step (3)
), the control data in the memory 320 is cleared and initialized again, and then the process moves to the control program in step (4).

In this case, since the memory 32 and the timer 33 receive power from the battery, they can continue to operate regardless of a power outage in the system power supply, retaining the same information in the memory, and stably restarting the second control.

Note that since the power required for the memory 32 and the timer is small, it is possible to use a small battery for a long period of time.

FIG. 3 shows another embodiment of the present invention, in which a delay circuit word is used in place of each timer in FIG.

Next, the operation in FIG. 3 will be explained using the time charts shown in FIG. 4 and FIG. 5.

FIG. 4 shows the case of a long-term power outage. When a second power outage occurs at time t1, the output of the on-off delay circuit becomes @θ'' after time limit T1.

When the power outage returns at time t, the output of the on-off delay circuit returns after a time period T, so that the microprocessor 31 determines a long-term power outage during the time period Tg.

Figure 5 shows the case of a momentary power outage. In this case, the interval between the time it occurs and the time t when the power is restored is shorter than the time TI of the on-off delay circuit, so the output of the on-off delay circuit is "l' It remains the same, and from this it is determined that it is a momentary power outage.

This makes it possible to determine whether it is an instantaneous power outage or a long-term 8P peak, and an appropriate backup operation for the instantaneous power outage is performed.
51 [Effect of the invention] 52 As explained above, the present invention (-) is small and simple.
53 Detect momentary power outages using a simple circuit and
80 A rational motor control device that performs backup operation of the setter control to stabilize (= continue) operation of the electric machine 31. Instantaneous shutdown of the device (backup control circuit is obtained. 33 Brief explanation of drawings)
Fig. 1 is a system diagram showing one embodiment of the present invention, Fig. 235 is a flowchart showing the operating procedure in Fig. 1 (= Fig. 3 is a system diagram showing another embodiment of the present invention) , 37 FIGS. 4 and 5 are time charts explaining the operation of FIG.
FIG. 7 is a circuit diagram showing an example of a conventional control power supply (8733).

1 Main circuit power transformer 2 Magnetic force converter 3 Motor 4 Control circuit 5 Control power circuit Control power transformer Rectifier Voltage control circuit Capacitor Microprocessor Memory timer Input/output circuit On/off delay circuit Battery power monitor Agent Patent attorney Yoshiaki Inomata 11 or 1 person) No.
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] There is a momentary power outage detection circuit that determines whether it is a momentary power outage or a long-term power outage based on the time from when the power outage occurs until the power is restored, a battery that supplies power to the memory even during a power outage, and a circuit that detects a momentary power outage when the power outage is restored. In addition to restarting the program using the control data stored in the memory, it also has a backup function that clears the control data stored in the memory, initializes it again, and restarts the program in the event of a long-term power outage. A momentary power outage backup control circuit for a motor control device, characterized in that: