JP4741523B2 - Instantaneous power failure generator - Google Patents

Description

  The present invention relates to an apparatus for generating an instantaneous power failure that is used for testing the influence of an instantaneous power failure of an electronic device.

Electronic devices in recent years have been digitized. The power supply uses a commercial AC power supply with a frequency of 50 or 60 Hz, but the memory in which the control data of the electronic device is stored is reset due to an instantaneous power failure (instantaneous power failure) or voltage drop, and the data disappears. In some cases, the control program of the device may be destroyed, resulting in malfunctions such as runaway due to loss of control. For this reason, some power supplies are provided in order to cope with a momentary power failure to prevent abnormal operation of the electronic device due to the momentary power failure.
In electronic devices in the medical field, the settings of the device may be canceled or stop operating normally due to a momentary power failure, and the above operations may be life-threatening. It is necessary to test for this.

JP 2006-304437 A

The present invention makes it possible to generate various modes of instantaneous power interruption in order to test the effect of instantaneous power interruption on an electronic device.
As shown in FIG. 5, the conventional instantaneous power failure generating device uses power switch elements Q1 and Q2 and instantaneously turns off the power switch elements Q1 and Q2 by a start switch (not shown). The power switch elements Q1 and Q2 are likely to generate heat when they are turned on and off because they are serially connected to the power supply circuit and a current is constantly flowing through the elements.

The conventional instantaneous power failure generation device can generate an instantaneous power failure only at a position where the phase angle of the power source at the time of the instantaneous power failure is constant, and in the case of the instantaneous power failure device in which the power switch element is turned off by a manual switch, The phase angle of the power source when the outage occurred was indefinite, and the electronic device could not be tested by specifying the phase angle.
Although details are unknown as a solution to these problems, Patent Document 1 proposes to provide an input device for setting the instantaneous power interruption mode condition.

  The present invention makes it possible to change the phase angle for generating an instantaneous power failure with a simple configuration and not depending on the commercial power supply frequency, and to generate an instantaneous power failure state without generating heat in the power switch element. It is to be able to be made.

A switch and a power switch element are provided in parallel in the AC power supply circuit, and a control unit that turns the power switch element OFF and ON after the switch OFF and ON operations, the peak value of the AC power supply voltage and the phase angle of the AC power supply Is a momentary power failure generation device comprising a phase setting unit that compares the voltage proportional to the voltage and sends an operation signal of the switch and the power switch element to the control unit.
More specifically, the phase setting unit includes an AC power supply voltage peak hold circuit, a voltage peak value voltage dividing circuit, a circuit that periodically generates a voltage proportional to the phase angle of the AC power supply, and the divided voltage. This is an instantaneous blackout generator that is a circuit composed of a comparator that compares voltages proportional to a phase angle.

According to the present invention, it is possible to set the phase at the time of occurrence of instantaneous interruption without depending on the power supply frequency, and to perform tests under various conditions on the influence of the instantaneous interruption on the electronic apparatus. At the development and prototyping stages, it is possible to test the effects of momentary power interruptions in detail.
Further, in the present invention, when an instantaneous interruption occurs, the switch S1 is turned off immediately before the power switch elements Q1 and Q2 are turned off, and thereafter, the power switch elements Q1 and Q2 are turned off. , Q2 heat generation is suppressed to zero.

FIG. 1 is a block diagram of an apparatus for instantaneously stopping power supply according to the present invention.
As shown in FIG. 2, the inspection device power source E that supplies power to the device to be inspected for the influence of the instantaneous power interruption includes a switch unit 3 in which a relay switch S1 is provided in parallel with the power switch elements Q1 and Q2. To the outlet 4 for inspection equipment. Electric power is supplied to the electronic device for inspecting the influence of the power supply interruption through the inspection device outlet 4. The power switch element Q and the switch S1 are connected in parallel. Almost no current flows through the power switch element Q, and the current of the power switch element Q is substantially zero.

The power switch element Q and the switch S1 are turned on and off by a driver controlled by the control unit 1.
The control unit 1 includes a power switch element based on a signal from the phase setting unit 2 that specifies the phase of occurrence of instantaneous power failure, an instantaneous power failure time setting unit that can set a time of instantaneous power failure, and a signal from the start switch. And a signal to momentarily turn off the relay switch is sent to the driver to generate an instantaneous stop.

As shown in the time chart of FIG. 3, the instantaneous power failure occurrence signal from the control unit 1 is first turned off for the switch S1 and the power switch element Q in the on state, and after this time T1 the power switch The element Q is turned off.
Then, the power switch element Q is turned on after T2 time, and the instantaneous power interruption time becomes T2. Further, since the switch S1 is turned on after the time T3, the time for the current to flow through the power switch element Q is a short time of T1 + T3, which prevents a large current from flowing into the power switch element at the time of on / off. Since no current flows through the power switch element Q, heat generation is suppressed.

  When the control unit 1 sends a start switch 11 for starting an instantaneous stop, an instantaneous stop time setting means 12 for setting an instantaneous stop time, and a disconnection signal from the control unit 1 to the switch unit 3, the switch 1 and the power Delay setting means 13 for setting a delay time T1 is provided in a signal sent to the switch element Q. The start switch 11 activates a circuit that causes a momentary power failure, and the momentary power failure time setting means 12 sets T2, which is a time during which the power supplied to the inspection device is turned off. The setting means 13 sets times T1 and T3, respectively. The delay times T1 and T3 are usually equal.

  The phase setting unit 2 that determines the phase at which the switch S1 is turned off is compared with the waveform shaping circuit, the differentiation circuit, the integration circuit, the peak hold circuit that holds the peak value obtained by the integration circuit, and the peak and phase setting means. And a comparator circuit that emits a signal when they match.

A specific example of the phase setting unit 2 is shown in FIG. The phase setting unit 2 compares the peak setting value of the voltage with the voltage setting circuit 26, the differentiation circuit 21, the integrating circuit 22, the peak holding circuit 23, and the voltage dividing circuit of the commercial power supply, and the voltage peak holding value. The sine wave of the commercial frequency power supply applied to the waveform shaping circuit 20 (U2B) is output as a rectangular wave synchronized with the input signal.
The rectangular wave is isolated by the photocoupler PC6 so as not to be affected by noise or the like from the commercial frequency power supply, and the rectangular wave is sent to the differentiating circuit 21 (C22 and R44). The signal generated by the differentiation circuit 21 is used as a reset signal for the integration circuit 22 at the next stage.

The integration circuit 22 includes a constant current circuit 25 including transistor elements Q11 and Q12, a capacitor C21 for integrating the current value, and a switch element Q13 for discharging the charge of the capacitor C21 (resetting the integration circuit). Since the current supplied from the constant current circuit 25 is stored in the capacitor C21 and discharged by a reset signal from the differentiation circuit 21 synchronized with the commercial power supply frequency, the voltage waveform of the capacitor C21 is a sawtooth nearly perfect synchronized with the frequency of the commercial power supply. It becomes a wave.
Further, the peak voltage of this sawtooth wave is output 20% higher at 50 Hz than at 60 Hz, and the peak voltage is held by the peak hold circuits U9C, U9D, D19, C29. By using the difference in peak voltage value, it is possible to obtain a signal for generating an instantaneous power failure at a desired phase without depending on the power supply frequency, and this peak-held voltage value is used as a reference voltage for phase comparison. To do.

In this way, phase information can be obtained without depending on the commercial power supply frequency by using a voltage corresponding to the frequency of the commercial power supply as a reference voltage, and an instantaneous power failure can be generated at an arbitrary phase angle position. Become.
Since the voltage of the capacitor C21 increases in proportion to the phase of the commercial frequency power supply, the reference frequency in the peak hold circuit 23 is compared with the voltage divided by the variable resistor VR1 in the comparator circuit 24, thereby comparing the commercial frequency power supply. A trigger signal is generated at an arbitrary phase angle, and the trigger signal is sent to the control unit 1.

  The control unit 1 sends a signal for driving the switch S1 and the power switch element Q to the driver with a delay time set in advance by the delay setting means 13 for the instantaneous stop occurrence signal, and the time T2 set by the instantaneous stop time setting means 12 Since the power supply of the inspection equipment is brought into an instantaneous power interruption state, the influence of the instantaneous power interruption on the inspection equipment can be observed.

  As described above, tests such as loss of data of electronic equipment, program destruction, malfunction of electronic equipment, etc. caused by instantaneous power interruption of commercial power supply can be performed by the power supply interruption generator of the present invention in various modes. An instantaneous power failure state can be generated and implemented.

The block diagram of the instantaneous power failure apparatus of this invention. The conceptual diagram of the disconnection switch of this invention. The time chart of the cutting switch of the present invention. The circuit diagram of a phase setting part. The conceptual diagram of the cutting switch of the conventional instantaneous power failure apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control part 2 Phase setting part 3 Disconnection switch part Q1, Q2 Power switch element S1 Switch Q11, Q12, Q13 Transistor PC6 Photocoupler U2B, U9B, U9C, U9D Operational amplifier R Resistance VR Variable resistance C Capacitor D Diode

Claims (4)

A switch and a power switch element are provided in parallel in the AC power supply circuit, and a control unit that turns the power switch element OFF and ON after the switch OFF and ON operations, the peak value of the AC power supply voltage and the phase angle of the AC power supply An instantaneous power failure generating device comprising a phase setting unit that compares the voltage proportional to the voltage and sends an operation signal of the switch and the power switch element to the control unit. 2. The instantaneous power failure generating device according to claim 1, wherein the control unit includes instantaneous power failure time setting means and delay time setting means. 3. The phase setting unit according to claim 1, wherein the phase setting unit includes a voltage peak hold circuit of the AC power source, a voltage peak voltage dividing circuit, a circuit that periodically generates a voltage proportional to the phase angle of the AC power source, and a voltage dividing circuit. A momentary power failure generating device, which is a circuit composed of a comparator that compares the measured voltage with a voltage proportional to the phase angle. 4. The instantaneous power failure generator according to claim 3, wherein the phase setting means is a variable resistor.