EP-4699678-A3 - SMOKE-FILLED BUBBLE MACHINE AND CONSTANT-TEMPERATURE CONTROL CIRCUIT
EP4699678A3EP 4699678 A3EP4699678 A3EP 4699678A3EP-4699678-A3
Abstract
A smoke-filled bubble machine (100) and a constant-temperature control circuit (300) are disclosed. Firstly, a heating member (170) is heated at a full-speed to make the heating member (170) heat up rapidly. When a temperature of the heating member (170) rises above a first predetermined threshold, a loop switch is alternately turned on and turned off, and a turned-on duration is iteratively adjusted, so as to enable the heating member (170) to heat up stably to near an optimal temperature value. Finally, the temperature of the heating member (170) is kept as close to the optimal temperature value as possible according to a predetermined PWM signal. In this way, high-quality bubbles can be generated.
Inventors
- YANG, RUIMIAN
- CHEN, RUIBAO
Assignees
- Shenzhen Qiaohua Industries Limited
Dates
- Publication Date
- 20260506
- Application Date
- 20250814