JP3059505B2 - Triac endurance test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a durability test apparatus for a triac used for controlling AC power, and more particularly to an improvement in test efficiency.

[0002]

2. Description of the Related Art As shown in FIG. 6, a triac 2 connected to an AC power supply 1 is connected to a resistance 3 or a load 3 such as a halogen lamp or the like which is a real machine. And the control unit 4 repeatedly turns the triac 2 on and off. As a typical method for controlling the on / off of the triac 2, a zero-cross control for suppressing the inrush current by turning on / off the triac 2 at 0 ° and 180 ° of the AC voltage waveform as shown in FIG. There is a phase shift control in which the inrush current is suppressed by controlling the phase of the AC voltage as shown in FIG.

[0003]

However, when the triac 2 is turned on and off by phase shift control, if a resistive load is used as the load 3, the output voltage from the triac 2 may be low. To pass a constant current, the resistance value of the load 3 must be changed. For example, when the AC voltage is 100 V and the current flowing through the triac 2 is 10 A, the voltage applied to the load 3 changes between 0 V and 100 V. Therefore, load 3
The resistance value must be varied according to the voltage applied to
There is a disadvantage that the durability test apparatus becomes complicated.

[0004] This disadvantage can be solved by using an actual load such as a halogen lamp as the load 3. However, when an actual load such as a halogen lamp is used, the triac 2 repeats on / off control, thereby causing a halogen. The resistance of the lamp or the like increases, and the value of the rush current gradually decreases, so that an accurate durability test cannot be performed. For this reason, the triac 2 has to increase the repetition interval of ON / OFF to suppress the decrease of the rush current, and there is a disadvantage that the durability test takes time. SUMMARY OF THE INVENTION The present invention has been made to solve such a disadvantage, and has as its object to provide a durability test apparatus capable of testing the durability of a triac in a short time.

[0005]

SUMMARY OF THE INVENTION The triac endurance test device according to the present invention, an AC voltage on - the endurance test apparatus of the triac to be turned off, to be tested triac
AC power to supply AC power to the
Multiple switching units connected in parallel to the power side and the output of each switching unit
Triac respectively the force side connected load unit sets the number of repetitions of the test triac on-time and off-time and on-off, the turning on or off under test triac by the off-time on-time set Is 1
And a control unit for sequentially switching the switching unit each time the switch is turned on / off.

Further, the control unit may detect a current flowing when the triac under test is repeatedly turned on, and extend the off-time of the triac when the detected current changes from the previously detected current. preferable.

[0007]

[Action] In this invention, by connecting a plurality of load unit via a switching unit in parallel to be tested triac, this
Do not supply AC power from the AC power supply to the triac under test.
In addition, the control unit repeatedly turns on and off, and each time the triac is turned on and off once, the switching unit sequentially switches a plurality of load units to connect to the triac under test.

The control section detects and stores the current flowing when the triac under test is repeatedly turned on, and detects the current detected when the plurality of load sections are sequentially switched and connected to the triac under test. When the current changes from the specified current, the off-time of the triac is extended to lower the temperature of the load, and the maximum
Apply input current .

[0009]

FIG. 1 is a circuit diagram showing an embodiment of the present invention. As shown in the figure, the durability test equipment of TRIAC is
An AC power supply 1 for supplying AC power to a triac 2 as a component under test, a plurality of changeover switches 51 to 5n connected in parallel to an output side of the triac 2, and an actual machine connected to each of the changeover switches 51 to 5n; For example, the control unit 4 controls on / off of loads 31 to 3n and a triac 2 formed of a halogen lamp and switches the changeover switches 51 to 5n. The control unit 4 includes a repetition number setting unit 41 for setting the number N of ON / OFF of the triac 2, an ON time setting unit 42 for setting the ON time T (ON), as shown in FIG. A gate for turning on / off an OFF time setting unit 43 for setting a time T (OFF), a zero cross point extraction unit 44 for extracting a zero cross point AC (0) of the AC voltage output from the AC power supply 1, and a triac 2. The signal G and the control signal R (1) of the changeover switches 51 to 5n
To R (n) and the remaining number of repetitions N (R).
Having. Further, a start switch 46, a stop switch 47, and a stop switch 48 are connected to the drive control unit 45.

The operation of the durability test apparatus configured as described above will be described with reference to the waveform diagram of FIG. 3 and the flowchart of FIG. First, the ON time setting unit 42 and the OFF time setting unit 4
3 shows ON time T (ON) and OFF time T (OF) of triac 2
F) is set, and the number N of ON / OFF repetitions is set in the repetition number setting unit 41 (steps S1 to S3). Next, when the start switch 46 is operated to start the durability test apparatus, the first load 31 is selected by the drive control unit 45 (steps S4 and S5). Thereafter, the operation proceeds unless the stop switch 47 is operated, and the drive control unit 45 first turns on the changeover switch 51 to turn on the triac 2 and the load 3.
1 (steps S6 and S7). Next, the zero-cross point AC (0) of the AC voltage is extracted by the zero-cross point extracting unit 44, and a gate signal G synchronized with the zero-cross point AC (0) is sent out to turn on the triac 2, and the triac is passed through the load 31. Then, a current is passed through 2 (step S8).

The state in which current flows through the triac 2 through the load 31 is determined by the on-time T set in the on-time setting unit 42.
After (ON) continues, the transmission of the gate signal G is terminated in synchronization with the zero cross point AC (0) of the AC voltage, and the triac 2 is turned off (steps S9 and S9).
10). Then, the operation proceeds as long as the interruption switch 48 is not operated (step S11). This off state is the off time T (O) set by the off time setting unit 43.
If (FF) continues (step S12), "1" is subtracted from the remaining number of repetitions N (R), and it is checked whether the remaining number of repetitions N (R) is zero (steps S13 and S14). . When the remaining number of repetitions N (R) is not zero, it is checked whether the used load is the last load 3n, and when it is not the last load 3n, the next load 31 is selected (steps S15 and S16). ). Then, the changeover switch 52 is selected and the same processing as described above is performed.

After repeating this processing up to the last load 3n, the first load 31 is selected again and the processing is continued (step S5). Then, when the remaining number of repetitions N (R) becomes zero, the process ends. The remaining number of repetitions N
(R) can be displayed and confirmed on the display unit.

As described above, while the plurality of loads 31 to 3n are sequentially switched, the ON time T (O
N) and the OFF time T (OFF) turns on the triac 2
Since turning off, since the temperature of the load when supplying a current to the triac 2 there is a return to normal temperature, collision of triac 2
The input current can always be maximized.

In the above embodiment, the off-time T (OFF) of the triac 2 is set in advance by the off-time setting unit 4.
Although the case where the regulation is performed by the constant value set in 3 has been described, the off-time T (OFF) may be varied depending on the state of the loads 31 to 3n.

For example, as shown in FIG.
The current flowing repeatedly through the triac 2 through the triac 2 is detected by the current detecting means 6 and stored in the control unit 4. When the detected current changes, the temperature of the loads 31 to 3n increases due to the current repeatedly flowing to the loads 31 to 3n, which are, for example, halogen lamps, the resistance increases, and the current flowing to the triac 2 flows last time. If it becomes smaller than the current value, the off time T of the triac 2
(OFF) is gradually increased to prevent the temperature of the loads 31 to 3n from rising. By varying the off-time T (OFF) depending on the state of the loads 31 to 3n, the maximum inrush current can always flow through the triac 2.

[0016]

As described above, according to the present invention, a plurality of load units are connected in parallel to a triac under test via a switching unit, and the triac under test is switched from an AC power supply.
Since the control unit repeatedly turns on and off while supplying the flowing power, and each time the triac is turned on and off once, the switching unit sequentially switches a plurality of load units to connect to the triac under test. 2 can always maximize the inrush current, and a triac durability test can be performed in a short time.

The control section detects and stores the current flowing when the triac under test is repeatedly turned on, and detects the current detected when the plurality of load sections are sequentially switched and connected to the triac under test. By extending the off-time of the triac and lowering the temperature of the load when the current is changing from the supplied current, the maximum inrush current can always flow to the triac, and the durability test of the triac can be performed under the best conditions. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a control unit of the embodiment.

FIG. 3 is a waveform chart showing the operation of the embodiment.

FIG. 4 is a flowchart showing the operation of the embodiment.

FIG. 5 is a circuit diagram showing another embodiment.

FIG. 6 is a circuit diagram showing a conventional example.

FIG. 7 is a waveform diagram showing on / off control of a triac.

FIG. 8 is a waveform chart showing another on / off control of the triac.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Triac 31-3n Load 4 Control part 51-5n Changeover switch

Claims (2)

(57) [Claims] In a triac endurance test apparatus for turning on / off an AC voltage, an AC voltage is applied to a triac under test.
An AC power supply that supplies power and a triac output
A plurality of switching units connected to the column and the output side of each switching unit
Set the connected load section, the on-time and off-time of the triac under test , and the number of repetitions of on / off,
The test triac is turned on / off according to the set on time and off time, and the triac is turned on / off once.
A durability test apparatus for a triac, comprising: a control unit that sequentially switches a switching unit each time the switch is turned off. 2. The control unit detects a current flowing when the triac under test is repeatedly turned on, and extends an off-time of the triac when the detected current is different from a previously detected current. 3. The durability test apparatus for a triac according to 1.