Shutdown device control method and apparatus, and shutdown device

1 . A method for controlling a shutoff device, applied to a processor of the shutoff device,

wherein the shutoff device comprises N main switching transistors corresponding to N photovoltaic modules one by one and N bypass switching transistors corresponding to the N photovoltaic modules one by one;

wherein a positive terminal of a power supply of the processor is connected to an output positive terminal of a first photovoltaic module, a negative terminal of the power supply of the processor is connected to an output negative terminal of an i-th photovoltaic module, a first terminal of a first main switching transistor is an output positive terminal of the shutoff device, a second terminal of an i-th main switching transistor is connected to an output positive terminal of the i-th photovoltaic module, a first terminal of an (i+1)-th main switching transistor is connected to an output negative terminal of the i-th photovoltaic module, an output negative terminal of a N-th photovoltaic module is an output negative terminal of the shutoff device, a first terminal of each bypass switching transistor is connected to a first terminal of a corresponding main switching transistor, a second terminal of said bypass switching transistor is connected to an output negative terminal of the corresponding photovoltaic module, wherein N≥i≥1, and N and i are both integers;

wherein the method comprises:

controlling the N main switching transistors to be turned on after receiving a heartbeat signal;

determining whether a power supply voltage of the processor is less than a first under-voltage protection voltage; and

when determining that the power supply voltage of the processor is less than the first under-voltage protection voltage, controlling the N main switching transistors to be turned off, and controlling the N bypass switching transistors to be turned on.

2 . The method according to claim 1 , wherein before the determining whether a power supply voltage of the processor is less than a first under-voltage protection voltage, the method further comprises:

determining whether the power supply voltage of the processor is less than a second under-voltage protection voltage, the second under-voltage protection voltage being less than the first under-voltage protection voltage;

when determining that the power supply voltage is not less than the second under-voltage protection voltage, proceeding to the step of determining whether the power supply voltage of the processor is less than the first under-voltage protection voltage; and

when determining that the power supply voltage is less than the second under-voltage protection voltage, controlling the processor to be powered off, controlling the processor to be powered on after receiving a power on command, and proceeding to the step of determining whether the power supply voltage of the processor is less than the second under-voltage protection voltage.

3 . The method according to claim 1 , wherein the bypass switching transistor is a Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET, and the MOSFET comprises a body diode;

wherein after the controlling the N main switching transistors to be turned off, the method further comprises:

obtaining a bypass current through said bypass switching transistor;

determining whether the bypass current is greater than a preset current; and

when determining that the bypass current is greater than the preset current, controlling the N bypass switching transistors to be turned on.

4 . The method according to claim 3 , wherein the determining whether the bypass current is greater than the preset current comprises:

determining whether the bypass current is continuously greater than the preset current during a first preset period; and

when determining that the bypass current is continuously greater than the preset current during the first preset period, proceeding to the step of controlling the N bypass switching transistors to be turned on.

5 . The method according to claim 1 , wherein after the controlling the N main switching transistors to be turned off and controlling the N bypass switching transistors to be turned on, the method further comprises:

determining whether a turning-on period of the N bypass switching transistors reaches a second preset period;

when determining that the turning-on period of the N bypass switching transistors reaches the second preset period, controlling the N bypass switching transistors to be turned off, and proceeding to the step of controlling the N main switching transistors to be turned on.

6 . The method according to claim 5 ,

wherein the controlling the N main switching transistors to be turned on comprises:

controlling the N main switching transistors to be turned on by staggering peaks; and

wherein the controlling the N bypass switching transistors to be turned off comprises:

controlling an order of controlling the N bypass switching transistors to be turned off to be the same as an order of controlling the corresponding N main switching transistors to be turned on by staggering peaks.

7 . The method according to claim 1 , wherein after the determining whether a power supply voltage of the processor is less than a first under-voltage protection voltage, the method further comprises:

when determining that the power supply voltage of the processor is not less than the first under-voltage protection voltage, obtaining operation information of the N photovoltaic modules;

based on the operation information, determining whether there is a photovoltaic module with abnormal operation in the N photovoltaic modules; and

when determining that there is the photovoltaic module with abnormal operation, controlling a main switching transistor corresponding to the photovoltaic module with abnormal operation to be turned off, and controlling a bypass switching transistor corresponding to the photovoltaic module with abnormal operation to be turned on.

8 . An apparatus for controlling a shutoff device, comprising:

a memory of the apparatus, configured to store a computer program; and

a processor of the apparatus, configured to implement a method for controlling the shutoff device when executes the computer program;

wherein the method for controlling the shutoff device is applied to a processor of the shutoff device;

wherein the shutoff device comprises N main switching transistors corresponding to N photovoltaic modules one by one and N bypass switching transistors corresponding to the N photovoltaic modules one by one;

wherein a positive terminal of a power supply of the processor is connected to an output positive terminal of a first photovoltaic module, a negative terminal of the power supply of the processor is connected to an output negative terminal of an i-th photovoltaic module, a first terminal of a first main switching transistor is an output positive terminal of the shutoff device, a second terminal of an i-th main switching transistor is connected to an output positive terminal of the i-th photovoltaic module, a first terminal of an (i+1)-th main switching transistor is connected to an output negative terminal of the i-th photovoltaic module, an output negative terminal of a N-th photovoltaic module is an output negative terminal of the shutoff device, a first terminal of each bypass switching transistor is connected to a first terminal of a corresponding main switching transistor, a second terminal of said bypass switching transistor is connected to an output negative terminal of the corresponding photovoltaic module, wherein N≥i≥1, and N and i are both integers; and

wherein the method comprises:

controlling the N main switching transistors to be turned on after receiving a heartbeat signal;

determining whether a power supply voltage of the processor is less than a first under-voltage protection voltage; and

when determining that the power supply voltage of the processor is less than the first under-voltage protection voltage, controlling the N main switching transistors to be turned off, and controlling the N bypass switching transistors to be turned on.

9 . A shutoff device, comprising:

the apparatus for controlling the shutoff device according to claim 8 .

10 . The shutoff device according to claim 9 , further comprising: a diode, a first capacitor and a second capacitor;

wherein an anode of the diode is connected to the output positive terminal of the first photovoltaic module, a cathode of the diode is connected to a first terminal of the first capacitor and the positive terminal of the power supply of the processor respectively, a second terminal of the first capacitor is connected to an output negative terminal of the first photovoltaic module and a first terminal of the second capacitor respectively, the first terminal of the second capacitor is respectively connected to the output terminal of the power supply of the processor and a terminal of a power supply of an electrical apparatus in the shutoff device; and

wherein the processor is further configured to convert a voltage of the positive terminal of the power supply of the processor to supply power to the electrical apparatus in the shutoff device.