| 摘要 |
PURPOSE:To reduce the cost of a control device and to improve the reliability by forming a fuse pattern made of a fine copper foil pattern on a printed board, and connecting a control circuit for controlling a switching element through the pattern to an AC power source. CONSTITUTION:A fuse pattern 6 made of a fine copper foil pattern is formed on the back surface of a printed board 2, and a control circuit 7 for controlling bidirectional SCRs 4, 5 is connected to a power source 1 through the fuse pattern 6. A surge absorber 8 and a noise preventing capacitor 9 are connected in parallel with the circuit 7. The pattern 6 is formed of a fine copper foil patten having, for example, 0.3mm. or less of width and 15mm. or longer of length. In this manner, a control device having high reliability can be obtained inexpensively without necessity of mounting the fuse. |
