Photovoltaic combiner box monitoring system

Patent metadata

Field	Value
Publication number	US-10193496-B2
Application number	US-201515033451-A
Country	US
Kind code	B2
Filing date	Aug 31, 2015
Priority date	Apr 29, 2015
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A photovoltaic combiner box monitoring system includes a current sampling circuit, a microprocessor and a communication circuit; the current sampling circuit is connected with the microprocessor to sample at least one channel of current signals and input the sampled currents to the microprocessor; and the microprocessor is connected with the communication circuit to send the current signals sampled by the current sampling circuit by the communication circuit. Thus, the photovoltaic combiner box monitoring system can sample current signals from the photovoltaic combiner box by means of the current sampling circuit and send the sampled current signals through the communication circuit.

First claim

The invention claimed is:

1. A photovoltaic combiner box monitoring system, comprising a current sampling circuit, a microprocessor and a communication circuit, wherein
the current sampling circuit is connected with the microprocessor, and configured to sample at least one channel of current signals and input the sampled currents to the microprocessor, the current sampling circuit comprises at least one sampling branch, and each sampling branch comprises a connector and a line selector; the connector is connected with the line selector, and configured to sample a plurality of channels of current signals and input each channel of current signals to one of current input ports of the line selector by means of a port of the connector; and the line selector is connected with the microprocessor, and configured to output current signals that are inputted to respective current input ports of the line selector to the microprocessor in time division manner according to control signals output from the microprocessor; and
the microprocessor is connected with the communication circuit, and configured to send the current signals sampled by the current sampling circuit via the communication circuit.

2. The system of claim 1 , wherein each sampling branch further comprises an emitter follower, the emitter follower is connected between an output terminal of the line selector and the microprocessor, and configured to amplify the current signals from the line selector and to output the amplified current signals to the microprocessor.

3. The system of claim 2 , wherein each sampling branch further comprises a filter circuit, the filter circuit is connected between the emitter follower and the microprocessor, and configured to filter signals that are outputted from the emitter follower and output the filtered signals to the microprocessor.

4. The system of claim 1 , wherein each sampling branch further comprises a clamp protection circuit, the clamp protection circuit is connected with an output terminal of the corresponding sampling branch to which the clamp protection circuit belongs, and is configured to prevent a voltage of the output terminal of the corresponding sampling branch from exceeding a predetermined value.

5. The system of claim 1 , wherein a plurality of sampling branches are provided, the microprocessor comprises respective sampling current input terminals that are connected with respective output terminals of different sampling branches, and respective controls of line selectors of different sampling branches are connected with same control signal output terminals of the microprocessor.

6. The system of claim 1 , further comprising a voltage sampling circuit, wherein the voltage sampling circuit is connected with the microprocessor, and configured to sample voltage signals from a photovoltaic combiner box and output the sampled voltage signals to the microprocessor, the microprocessor is further configured to send the voltage signals sampled by the voltage sampling circuit through the communication circuit.

7. The system of claim 1 , further comprising a lightning protection monitor circuit, wherein the lightning protection monitor is connected with the microprocessor, and configured to sample lightning protection signals and to output the sampled lightning protection signals to the microprocessor; and the microprocessor is further configured to send the lightning protection signals sampled by the lightning protection monitor circuit through the communication circuit.

8. The system of claim 1 , further comprising a digital display circuit, wherein the digital display circuit is connected with the microprocessor, and configured to display the sampled current signals received by the microprocessor.

9. The system of claim 1 , further comprising an auxiliary power supply, wherein the auxiliary power supply is connected with the microprocessor, and configured to supply an operation voltage to the microprocessor.

10. The system of claim 1 , wherein the communication circuit comprises a lightning protection circuit.

11. The system of claim 2 , further comprising a voltage sampling circuit, wherein the voltage sampling circuit is connected with the microprocessor, and configured to sample voltage signals from the photovoltaic combiner box and output the sampled voltage signals to the microprocessor,
the microprocessor is further configured to send the voltage signals sampled by the voltage sampling circuit through the communication circuit.

12. The system of claim 2 , further comprising a lightning protection monitor circuit, wherein the lightning protection monitor is connected with the microprocessor, and configured to sample lightning protection signals and input the sampled lightning protection signal to the microprocessor; and
the microprocessor is further configured to send the lightning protection signals sampled by the lightning protection monitor circuit through the communication circuit.

13. The system of claim 2 , further comprising a digital display circuit, wherein the digital display circuit is connected with the microprocessor, and configured to display the sampled signals received by the microprocessor.

14. The system of claim 2 , further comprising an auxiliary power supply, wherein the auxiliary power supply is connected with the microprocessor, and configured to supply an operation voltage to the microprocessor.

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Energy Tech Co Ltd

Inventors

• Wang Qingmeng
• Han Xiaoyan

Classifications

• G01R1/36

  Overload-protection arrangements or circuits for electric measuring instruments · CPC title

• H02S50/00 Primary

  Monitoring or testing of PV systems, e.g. load balancing or fault identification · CPC title

• H02S50/10 Primary

  Testing of PV devices, e.g. of PV modules or single PV cells (testing of semiconductor devices during manufacturing {H10P74/00}) · CPC title

• Y02E10/50

  Photovoltaic [PV] energy · CPC title