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Protection circuit

A technology for protecting circuits and resistors, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of difficult heat dissipation, low efficiency of AC motors, high failure rate and cost, and achieve the effect of protecting motors and electronic controls

Active Publication Date: 2015-04-08
GUANGDONG CHIGO AIR CONDITIONING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Among them, the use of AC motors in air conditioners has been gradually reduced due to the disadvantages of low efficiency and high noise; with the development of modern technology, the promotion of brushless DC motors has solved the defects of AC motors. Feedback DC motor, however, due to the high cost, limited internal space of the motor, not easy to dissipate heat, and the built-in drive circuit board is easily damaged during use, it leads to the problems of high failure rate and high cost in mass promotion

Method used

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments . Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] see figure 1 , the protection circuit in the embodiment of the present invention includes:

[0031] Three pins at the input end: first input pin a, second input pin b and third input pin c, ten resistors: first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7, eighth resistor R8, ninth resistor R9 and tenth resistor R10, eight capacitors: first capacit...

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Abstract

The invention discloses a protection circuit which is applied to an external drive circuit of a direct current fan without Hall. A drive current of a direct current motor can be detected to be normal or not by means of comparison between a voltage value which corresponds to a three-phase input current and a preset voltage value, the direct current motor is enabled to stop working under the condition that the drive current is not normal, and therefore the protection circuit plays a role in protection of the motor and electric control.

Description

technical field [0001] The embodiments of the present invention relate to the field of protection circuits, in particular to a protection circuit arranged in an external drive circuit of a Hallless DC fan. Background technique [0002] An air conditioner, also known as an air conditioner, is a unit used to adjust parameters such as temperature, humidity, cleanliness, and air velocity in an area to meet human comfort or process requirements. [0003] With the continuous development of my country's air-conditioning industry, China has become the world's largest air-conditioning producer, and the use of air-conditioners is becoming more and more popular. At present, the fans used in air conditioners can be mainly divided into two types: AC motors and built-in feedback DC motors. [0004] Among them, the use of AC motors in air conditioners has been gradually reduced due to the disadvantages of low efficiency and high noise; with the development of modern technology, the promot...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
Inventor 林华刚吕小忠邱柏松徐林张建雄李彬
Owner GUANGDONG CHIGO AIR CONDITIONING