A fixed dual output power supply that automatically recognizes the input voltage

Abstract

The invention discloses a fixed dual output power supply for automatically identifying an input voltage. The fixed dual output power supply comprises a main circuit and a control circuit, wherein themain circuit comprises an input power supply, a circuit breaker QA0, a normally closed contact of an alternating current contactor QA1, an output path unit I and an output path unit II; one end of thecircuit breaker QA0 is connected to the L end of the input power supply, the other end of the circuit breaker QA0 is connected in series with the normally closed contact of the alternating current contactor QA1, and the output path unit I and the output path unit II are respectively connected with the normally closed contact of the alternating current contactor QA1; the input end of the control circuit is connected to a connection point of the circuit breaker QA0 and the normally closed contact of the alternating current contactor QA1, and the output end of the control circuit is connected tothe N end of the input power supply. The device is a single-input dual-output structure, and can automatically identify whether the input power supply is 110V or 220V; moreover, a relay coil does notneed to withstand a transient high voltage; and when a normally open contact of an alternating current contactor QA2 is adhered, the power supply is automatically cut off and a warning is given, andwhen a normally closed contact of the alternating current contactor QA2 is adhered, an indicator light warning is given.

Description

technical field [0001] The invention belongs to the technical field of power supplies and specifically designs a fixed dual-output power supply that automatically recognizes input voltages. Background technique [0002] Household electricity voltage standards in different countries in the world are not the same. Most countries have a mains voltage of 220 V, but some countries have a mains voltage of 110 V and 220 V. In this way, the rated voltage and power supply voltage of household appliances at home and abroad appear. mismatch problem. Currently, there are power voltage converters on the market that can convert 220V voltage to 110V output, or vice versa. But now almost all power supply voltage converters are single-input and single-output. If the input power is wrongly connected, it may damage the electrical appliances and even endanger the human body. Moreover, domestic and foreign electrical appliances cannot be used at the same time, and the input power voltage cannot...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned technical problems such as low safety performance and inconvenient use of the voltage converter, a fixed dual-output power supply that automatically recognizes the input voltage is provided. The voltage is fixed at 110 V and 220 V, and it can automatically cut off the power supply and give a warning when the moving contact of the AC contactor QA2 is stuck, and automatically warn when the moving and breaking contact of the AC contactor QA2 is stuck

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