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Capacitor ripple current protection device and method and air conditioner

A ripple current and protection device technology, applied in emergency protection circuit devices, output power conversion devices, electrical components, etc., can solve the problems of high cost and complex ripple circuit protection devices, and reduce production and after-sales costs. Avoid excessive ripple current and ensure safe use

Inactive Publication Date: 2018-11-23
AUX AIR CONDITIONING LTD BY SHARE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims to provide a capacitor ripple current protection device, method and air conditioner, so as to improve the complex and high cost problems of the existing capacitor ripple circuit protection device

Method used

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  • Capacitor ripple current protection device and method and air conditioner
  • Capacitor ripple current protection device and method and air conditioner
  • Capacitor ripple current protection device and method and air conditioner

Examples

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no. 1 example

[0041] This embodiment provides a capacitor ripple current protection device 1 to improve the problems existing in existing capacitor ripple current protection schemes such as complex structure, large occupied volume, high cost, and unfavorable product miniaturization design.

[0042] see figure 1 , figure 1 A schematic diagram of the capacitor ripple current protection device 1 provided in this embodiment is shown.

[0043] The capacitor ripple current protection device 1 is used to calculate the ripple current of the capacitor C according to the voltage across the capacitor C, and start a protection operation to prevent the capacitor C from being damaged when the ripple current exceeds a safe threshold.

[0044] Generally, the capacitor C is connected between the front-end circuit 5 and the rear-stage circuit 6. If the capacitor C is damaged, it will affect the normal operation of the entire circuit system.

[0045]The capacitor ripple current protection device 1 includes:...

no. 2 example

[0068] This embodiment provides a capacitor ripple current protection method. The capacitor ripple current protection method is applied to the capacitor ripple current protection device 1 provided in the first embodiment to prevent the capacitor C from C life shortening or damage and other problems.

[0069] It should be noted that the basic technical principles and technical effects of the capacitor ripple current protection method provided in this embodiment are roughly the same as those of the capacitor C ripple protection device provided in the first embodiment. For a brief description, this embodiment will not repeat For details, this embodiment does not introduce details, please refer to the relevant content in the first embodiment.

[0070] see figure 2 , the capacitor ripple current protection method includes the following steps S10-S40.

[0071] Step S10: Sampling and obtaining the voltage u across the capacitor C dc .

[0072] The voltage sampling circuit 2 is u...

no. 3 example

[0088] This embodiment provides an air conditioner, which includes the capacitor ripple current protection device 1 described in the first embodiment.

[0089] To sum up, the present invention provides a capacitor ripple current protection device, method, and air conditioner. The capacitor ripple current protection device includes: a voltage sampling circuit, a ripple current calculation circuit, and a protection circuit. The voltage sampling The circuit is electrically connected to the ripple current calculation circuit, the ripple current calculation circuit is electrically connected to the protection circuit, and the protection circuit is electrically connected to the subsequent circuit of the capacitor

[0090] The voltage sampling circuit is used to sample the voltage signal across the detection capacitor, and send the detected voltage signal to the ripple current calculation circuit

[0091] The ripple current calculation circuit calculates the ripple current of the capa...

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Abstract

The invention provides a capacitor ripple current protection device and method and an air conditioner. The capacitor ripple current protection device comprises a voltage sampling circuit, a ripple current calculation circuit and a protection circuit. The voltage sampling circuit is electrically connected to the ripple current calculation circuit. The ripple current calculation circuit is electrically connected to the protection circuit. The protection circuit is electrically connected to a rear stage circuit of acapacitor. The voltage sampling circuit is used for sampling the voltage of the capacitor. The ripple current calculation circuit calculates the ripple current of the capacitor according to the sampling voltage and the sampling time. The protection circuit is used to perform a protection operation when the ripple current is greater than a threshold. By setting the voltage sampling circuit, the ripple current calculation circuit and the protection circuit, the ripple current overcurrent protection is applied to the capacitor to prevent the ripple current of the capacitor from exceeding the safety threshold, thereby the safety of the capacitor is ensured effectively. Excessive ripple current leading to shortened or failed capacitor life is avoided, and the cost of production and after-sale cost of electric appliances are reduced.

Description

technical field [0001] The invention relates to the technical field of protection circuits, in particular to a capacitor ripple current protection device, method and air conditioner. Background technique [0002] Capacitor is a commonly used energy storage element. It is often used at the DC end to stabilize the voltage. The ripple current of the capacitor is a key parameter affecting the service life of the capacitor. If the ripple current is too large, the internal temperature of the capacitor will rise and the life will drop sharply. , but in the existing applications, the ripple current of the capacitor is not detected and the protection mechanism is not set, which may easily cause the service life of the capacitor to decay or even fail. [0003] In the traditional method, a current sensor is connected in series in the capacitor circuit to collect the ripple current of the capacitor, and the capacitor is protected according to the magnitude of the ripple current. This me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/16H02M1/32
CPCH02H7/16H02M1/32
Inventor 李发顺黄绍敏
Owner AUX AIR CONDITIONING LTD BY SHARE LTD
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