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CN-224233179-U - Distribution box and power supply system

CN224233179UCN 224233179 UCN224233179 UCN 224233179UCN-224233179-U

Abstract

The application discloses a distribution box and a power supply system, which comprise a power converter, a change-over switch and a distribution box, wherein a first movable contact of the change-over switch is connected with a grid connection port of the power converter, the first movable contact of the change-over switch is also used for being connected with a power grid, a second movable contact of the change-over switch is connected with a grid disconnection port of the power converter, a static contact of the change-over switch is connected with a first end of the distribution box, and a second end of the distribution box is used for being connected with a load. According to the technical scheme, the connection between the power converter and the distribution box can be realized on the premise of not damaging a house structure.

Inventors

  • Lai Huaxing
  • LI LIZHEN

Assignees

  • 阳光新能源开发股份有限公司

Dates

Publication Date
20260512
Application Date
20250430

Claims (13)

  1. 1. The power supply system is characterized by comprising a power converter, a change-over switch and a distribution box; the first movable contact of the change-over switch is connected with the grid connection port of the power converter, the first movable contact of the change-over switch is also used for being connected with a power grid, the second movable contact of the change-over switch is connected with the grid connection port of the power converter, the stationary contact of the change-over switch is connected with the first end of the distribution box, and the second end of the distribution box is used for being connected with a load.
  2. 2. The power supply system of claim 1, wherein the distribution box comprises a switching circuit; The static contact of the change-over switch is connected with the first end of the switch circuit, and the first end of the switch circuit is used for being connected with a first type of load; the switching circuit is used for being disconnected when the power grid is powered down.
  3. 3. The power supply system of claim 2, wherein the switching circuit comprises a voltage sampling circuit, a processing circuit, and an execution switch; The input end of the voltage sampling circuit is connected with the first end of the switching circuit and is configured to sample the voltage of the first end of the switching circuit, and rectify and divide the sampled voltage to obtain divided voltage; The input end of the processing circuit is connected with the output end of the voltage sampling circuit, the output end of the processing circuit is connected with the execution switch, the processing circuit is configured to compare the divided voltage with a voltage threshold value to obtain a comparison result, and the comparison result is used for controlling the execution switch to be opened or closed.
  4. 4. The power supply system of claim 3, wherein the processing circuit comprises a first comparator, a second comparator, and a flip-flop; The negative input end of the first comparator is connected with the output end of the voltage sampling circuit, the positive input end of the first comparator is connected with a first voltage threshold value, and the output end of the first comparator is connected with the reset end of the trigger; The positive input end of the second comparator is connected with the output end of the voltage sampling circuit, the negative input end of the second comparator is connected with a second voltage threshold, and the output end of the second comparator is connected with the input end of the trigger, wherein the first voltage threshold is smaller than the second voltage threshold.
  5. 5. The power supply system of claim 4, wherein the flip-flop is a falling edge flip-flop.
  6. 6. The power supply system according to any one of claims 3 to 5, wherein the switching circuit further comprises a control circuit, an input end of the control circuit is connected with an output end of the processing circuit, and an output end of the control circuit is connected with the execution switch; the execution switch is a contactor, and the control circuit comprises a relay which is connected in series in a power supply loop of the contactor.
  7. 7. The power supply system according to any one of claims 3 to 5, wherein the voltage sampling circuit includes a rectifying circuit, a filter circuit, and a voltage dividing circuit; The input end of the rectifying circuit is connected with the first end of the switching circuit, the output end of the rectifying circuit is connected with the input end of the filtering circuit, the output end of the filtering circuit is connected with the input end of the voltage dividing circuit, and the output end of the voltage dividing circuit is connected with the input end of the processing circuit.
  8. 8. The power supply system of any one of claims 2-5, wherein the distribution box further comprises a main switch, a first branch switch, and a second branch switch; the first end of the main switch is connected with the static contact of the change-over switch, and the second end of the main switch is connected with the first end of the switch circuit; The second end of the switch circuit is connected with the second type of load through the first branch switch, and the second end of the total switch is connected with the first type of load through the second branch switch.
  9. 9. The power supply system of any of claims 1-4, wherein the dc side of the power converter is configured to connect to at least one of a battery or a photovoltaic module.
  10. 10. The distribution box is characterized by comprising a switch circuit; The first end of the switching circuit is connected with the static contact of the change-over switch, and the second end of the switching circuit is used for being connected with a second type of load; the first movable contact of the change-over switch is connected with a grid connection port of the power converter, the first movable contact of the change-over switch is also used for being connected with a power grid, and the second movable contact of the change-over switch is connected with a grid connection port of the power converter; The first end of the switching circuit is used for connecting a first type of load, wherein the power supply priority of the first type of load is higher than that of the second type of load; the switching circuit is used for being disconnected when the power grid is powered down.
  11. 11. The electrical box of claim 10, wherein the switching circuit comprises a voltage sampling circuit, a processing circuit, and an execution switch; The input end of the voltage sampling circuit is connected with the first end of the switching circuit and is configured to sample the voltage of the first end of the switching circuit, and rectify and divide the sampled voltage to obtain divided voltage; the input end of the processing circuit is connected with the output end of the voltage sampling circuit, the output end of the processing circuit is connected with the execution switch and is configured to compare the divided voltage with a voltage threshold value to obtain a comparison result, and the comparison result is used for driving the execution switch to be opened or closed.
  12. 12. The power distribution box according to claim 11, wherein the switch circuit further comprises a control circuit, wherein an input end of the control circuit is connected with an output end of the processing circuit, and an output end of the control circuit is connected with the execution switch; the processing circuit sends the comparison result to the control circuit; The control circuit is configured to drive the execution switch to be opened or closed according to a comparison result.
  13. 13. The electrical box of claim 12, wherein the processing circuit comprises a first comparator, a second comparator, and a flip-flop; The negative input end of the first comparator is connected with the output end of the voltage sampling circuit, the positive input end of the first comparator is connected with a first voltage threshold value, and the output end of the first comparator is connected with the reset end of the trigger; The positive input end of the second comparator is connected with the output end of the voltage sampling circuit, the negative input end of the second comparator is connected with a second voltage threshold, and the output end of the second comparator is connected with the input end of the trigger, wherein the first voltage threshold is smaller than the second voltage threshold.

Description

Distribution box and power supply system Technical Field The application relates to the technical field of power supply, in particular to a distribution box and a power supply system. Background With the continuous popularization of new energy sources, the application of the household new energy source power supply system is increasing. The power converters in conventional power supply systems require the use of both grid-tie and off-grid wires to connect to the distribution box. Because the power converter is arranged outside the house, when two wires, namely the grid-connected wire and the off-grid wire, are used for connecting into the distribution box inside the house, the house can be damaged to a certain extent. Disclosure of utility model In view of the above, the embodiment of the application provides a power distribution box and a power supply system, which can realize connection of a power converter and the power distribution box on the premise of not damaging a house structure. The embodiment of the application provides a power supply system which comprises a power converter, a change-over switch and a distribution box, wherein a first movable contact of the change-over switch is connected with a grid connection port of the power converter, the first movable contact of the change-over switch is also used for being connected with a power grid, a second movable contact of the change-over switch is connected with a grid disconnection port of the power converter, a static contact of the change-over switch is connected with a first end of the distribution box, and a second end of the distribution box is used for being connected with a load. One possible implementation manner of the distribution box comprises a switching circuit, wherein a static contact of a change-over switch is connected with a first end of the switching circuit, the first end of the switching circuit is used for being connected with a first type of load, a second end of the switching circuit is used for being connected with a second type of load, the power supply priority of the first type of load is higher than that of the second type of load, and the switching circuit is used for being disconnected when a power grid is powered down. One possible implementation manner of the switching circuit comprises a voltage sampling circuit, a processing circuit and an executing switch, wherein the input end of the voltage sampling circuit is connected with the first end of the switching circuit and is configured to sample the voltage of the first end of the switching circuit and rectify and divide the sampled voltage to obtain divided voltage, the input end of the processing circuit is connected with the output end of the voltage sampling circuit, the output end of the processing circuit is connected with the executing switch, the processing circuit is configured to compare the divided voltage with a voltage threshold value to obtain a comparison result, and the comparison result is used for controlling the opening or closing of the executing switch. A possible implementation mode comprises a first comparator, a second comparator and a trigger, wherein the negative input end of the first comparator is connected with the output end of the voltage sampling circuit, the positive input end of the first comparator is connected with a first voltage threshold, the output end of the first comparator is connected with the reset end of the trigger, the output end of the trigger is connected with an execution switch, the positive input end of the second comparator is connected with the output end of the voltage sampling circuit, the negative input end of the second comparator is connected with a second voltage threshold, and the output end of the second comparator is connected with the input end of the trigger, wherein the first voltage threshold is smaller than the second voltage threshold. One possible implementation is that the flip-flop is a falling edge flip-flop. One possible implementation mode of the switching circuit further comprises a control circuit, wherein the input end of the control circuit is connected with the output end of the processing circuit, the output end of the control circuit is connected with the execution switch, the execution switch is a contactor, and the control circuit comprises a relay which is connected in series in a power supply loop of the contactor. One possible implementation manner of the voltage sampling circuit comprises a rectifying circuit, a filtering circuit and a voltage dividing circuit, wherein the input end of the rectifying circuit is connected with the first end of the switching circuit, the output end of the rectifying circuit is connected with the input end of the filtering circuit, the output end of the filtering circuit is connected with the input end of the voltage dividing circuit, and the output end of the voltage dividing circuit is connected with the input end of the processing circuit. One