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Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment

A technology of reverse polarity protection circuit and DC input terminal, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of increasing system power consumption, reducing system efficiency, and continuous loss, so as to increase power consumption, improve reliability, and cost low effect

Active Publication Date: 2014-01-29
TBEA SUNOASIS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diode will continue to conduct during the normal operation of the inverter and the current will pass through it for a long time, resulting in continuous loss. From the perspective of safety, there are higher requirements for the selection and heat dissipation of the diode, and the cost is higher.
It can be seen that the above-mentioned scheme of installing a diode at the DC input end increases the cost on the one hand, and on the other hand, it will increase the power consumption of the system and reduce the efficiency of the system when the inverter is running normally.

Method used

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  • Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment
  • Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment
  • Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Such as figure 2 As shown, this embodiment provides a DC input terminal anti-reverse connection protection circuit, which includes: a controllable disconnection accessory, a voltage detection unit and a control unit.

[0074] The controllable disconnecting accessory is connected between the DC input terminal and the subsequent circuit.

[0075] The voltage detection unit is connected in parallel between the positive and negative poles of the DC input terminal, and is used for real-time detection of the voltage signal between the positive and negative poles of the DC input terminal, and sends the detection result to the control unit.

[0076] The control unit is respectively connected to the voltage detection unit and the controllable disconnection accessory, and is used to determine whether the positive and negative poles of the DC input terminal are reversed according to the detection result of the voltage detection unit, and if it is determined to be reversed, contro...

Embodiment 2

[0085] This embodiment provides a DC input terminal anti-reverse connection protection circuit (structural schematic diagram and figure 2 same), wherein the control unit is specifically used for:

[0086] After the anti-reverse polarity protection circuit at the DC input terminal is powered on,

[0087] If the detection result of the voltage detection unit is that the voltage between the positive and negative poles of the DC input terminal is a negative voltage, it is determined that the positive and negative poles of the DC input terminal are reversely connected, and the controllable disconnection accessory is controlled to disconnect;

[0088] If the detection result of the voltage detection unit is that the voltage between the positive and negative poles of the DC input terminal is a positive voltage, it is determined that the positive and negative poles of the DC input terminal are positively connected, and the controllable disconnection attachment is controlled to pull i...

Embodiment 3

[0112] This embodiment provides a DC input terminal anti-reverse connection protection circuit (structural schematic diagram and figure 2 same), wherein the control unit includes a first sampling circuit and a first comparison circuit, that is, the control unit does not need to use the logic control device described in Embodiments 1 to 2, and only needs to use a hardware circuit to control the controllable disconnection Attachment snaps in / off.

[0113] The first sampling circuit is used to sample the voltage signal detected by the voltage detection unit in real time to obtain a voltage sampling signal, and send the voltage sampling signal to the first comparison circuit.

[0114] A voltage reference reverse judgment signal is preset in the first comparison circuit for comparing the voltage sampling signal with the voltage reference reverse judgment signal, if the voltage sampling signal is greater than the voltage reference reverse judgment signal Judging the signal, it is ...

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PUM

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Abstract

The invention provides a direct-current input end inverted connection protecting circuit. The direct-current input end inverted connection protecting circuit comprises a controllable disconnection accessory, a voltage detecting unit and a control unit, wherein the controllable disconnection accessory is connected between a direct-current input end and a rear-stage circuit; the voltage detecting unit is connected between a positive pole and a negative pole of the direct-current input end in parallel, and is used for detecting voltage signals between the positive pole and the negative pole of the direct-current input end and transmitting a detection result to the control unit; and the control unit is respectively connected with the voltage detecting unit and the controllable disconnection accessory, is used for judging whether the positive pole and the negative pole of the direct-current input end are in inverted connection or not according to the detection result of the voltage detecting unit, controls the controllable disconnection accessory to perform disconnection if the positive pole and the negative pole of the direct-current input end are in inverted connection, and controls the controllable disconnection accessory to perform connection if the positive pole and the negative pole of the direct-current input end are connected with each other correctly. Correspondingly, the invention provides direct-current input equipment and a direct-current input end inverted connection protecting method. Compared with the prior art, the direct-current input end inverted connection protecting circuit has the advantages that the cost can be reduced, and the power consumption of a system can also be reduced.

Description

technical field [0001] The invention relates to the technical field of anti-reverse connection protection of DC input terminals, in particular to a DC input terminal anti-reverse connection protection circuit and method, and a DC input device. Background technique [0002] In the photovoltaic grid-connected power generation system, the DC input terminal of the inverter is directly connected to the output terminal of the solar panel. When the DC input terminal of the inverter is reversed, its DC input terminal will pass through the switching tube in the inverter. A short circuit caused by a short circuit will damage the switch tube and even cause a fire. Therefore, the reverse connection protection of its DC input terminal in the inverter is required in relevant standards. [0003] In order to prevent reverse connection of the DC input terminal of the inverter, such as figure 1 As shown, in the prior art, a diode is generally provided at its DC input end to protect the inver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H11/00
CPCH02H11/002
Inventor 刘乐陶马超群刘伟增张磊梁欢迎
Owner TBEA SUNOASIS
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