On-off control circuit for heater in power distribution cabinet
The invention discloses an on-off control circuit for a heater in a power distribution cabinet. The on-off control circuit comprises a heater power supply, a heater, a first air switch, a second air switch, a control power supply, an optical coupler and a relay, wherein the replay comprises a coil a...
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Main Authors | , , , , , , , , , , |
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Format | Patent |
Language | English |
Published |
08.04.2015
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Subjects | |
Online Access | Get full text |
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Summary: | The invention discloses an on-off control circuit for a heater in a power distribution cabinet. The on-off control circuit comprises a heater power supply, a heater, a first air switch, a second air switch, a control power supply, an optical coupler and a relay, wherein the replay comprises a coil and a normally open node, a negative electrode of the control power supply is grounded, a positive electrode of the control power supply is connected with the coil of the relay, the coil of the replay is then grounded through the optical coupler, a control loop is formed, the first end part of the first air switch is connected with the normally open node of the relay, the second end part of the first air switch is connected with a positive element of the heater power supply, a negative electrode of the heater power supply is connected with the first end part of the second air switch, the second end part of the second air switch is connected with the first end part of the heater, the second end part of the heater is connected with the normally open node of the relay, a heater loop is formed, and a single chip microcomputer used for controlling the on-off state of the normally open node of the relay is also connected onto the relay. |
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Bibliography: | Application Number: CN20141747514 |