| 摘要 |
The circuit includes transistors (17a,17b) for being turned on and off by pulse width modulation reference signals of a timer (13). Photo couplers (15a,15b) are turned on and off in accordance with the turning-on and off of the transistors. Another set of transistors (18a,18b) operates in accordance with the turning-on and off of the photo couplers to drive DC motors (30a,30b). Transistors (19a,19b) are turned on and off by another set of reference signals to govern the operations of another set of photo couplers (16a,16b), while diodes (21a,21b) are connected in parallel through relays (20a,20b) to the DC motors (30a,30b). The circuit improves the running performance of the cleaner, and reduces the noise.
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