AC230V short circuit protection circuit applied to aviation electric heating system
A short-circuit protection circuit and protection circuit technology, applied in the direction of protection against overcurrent, etc., can solve problems such as long short-circuit protection time, low protection sensitivity, and inability to quickly protect aviation electric heating control systems
Active Publication Date: 2020-01-10
TIANJIN JINHANG COMP TECH RES INST
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Problems solved by technology
When the electric heating system on the aircraft is working, once the load is short-circuited, a large amount of heat will be generated instantaneously. In severe cases, it may cause explosion or fire, damage the product and power supply, and cause great harm. Therefore, short-circuit protection is one of the necessary functions of the product.
The traditional short-circuit protection circuit cuts off the output to achieve short-circuit protection for a long time, and the protection delay exceeds 1ms, which cannot quickly protect the aviation electric heating control system, and for output circuits with different rated currents, the protection sensitivity is low, and the short-circuit protection threshold value cannot be easily set
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[0019] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0020] Such as figure 1 As shown, the present invention provides a kind of AC230V short-circuit protection circuit applied to aviation electric heating system, including drive circuit, current sampling circuit, absolute value circuit, short-circuit threshold comparison circuit, power and protection circuit, power and protection circuit includes power circuit and Protection circuit, wherein the drive circuit is used to control the on and off of the power circuit, the power and protection circuit is used to realize the on and off of the output current, the current sampling circuit is used to convert the current signal into a voltage signal, and the absolute value circuit is used For converting the AC voltage into DC volt...
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The invention relates to an AC230V short circuit protection circuit applied to an aviation electric heating system, which belongs to the technical field of aviation electric heating control systems. The circuit comprises a drive circuit, a current sampling circuit, an absolute value circuit, a short circuit threshold comparison circuit and a power and protection circuit. By monitoring and comparing the current of a heating loop in real time, when the short circuit protection threshold current is reached, the heating loop is disconnected within 100 us, the reverse voltage is clamped, and the purposes of cutting off the heating loop and protecting the loop when the load is short-circuited are achieved.
Description
technical field [0001] The invention relates to the technical field of aviation electric heating control systems, in particular to an AC230V short-circuit protection circuit applied to the aviation electric heating system. Background technique [0002] The AC voltage system on traditional aircraft is mainly AC115V. With the development trend of more electric aircraft, AC230V voltage gradually appears on board. Since the voltage has doubled, the aviation electric heating control system needs higher reliability and safety design. When the electric heating system on the aircraft is working, once the load is short-circuited, a large amount of heat will be generated instantaneously. In severe cases, it may cause explosion or fire, damage the product and power supply, and cause great harm. Therefore, short-circuit protection is one of the necessary functions of the product. The traditional short-circuit protection circuit cuts off the output to achieve short-circuit protection for...
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IPC IPC(8): H02H3/08
CPCH02H3/08
Inventor 仝步升刘康刘强
Owner TIANJIN JINHANG COMP TECH RES INST