US-20260128592-A1 - POWER SUPPLY SYSTEM, PARALLEL SOCKET, AND METHOD FOR CONTROLLING POWER SUPPLY SYSTEM

US20260128592A1US 20260128592 A1US20260128592 A1US 20260128592A1US-20260128592-A1

Abstract

Provided is a power supply system. An all-in-one energy storage unit is connected to a grid-connected receptacle and an off-grid receptacle of a parallel socket. The parallel socket is connected to a fuel-powered generator. A bypass switch is connected between the grid-connected receptacle and the off-grid receptacle. When the power supply system is in an off-grid state and meets a load demand, the bypass switch is switched off; otherwise, the fuel-powered generator is controlled to start, and the bypass switch is switched on.

Inventors

Yuanchi YANG
Xiaoping Wang

Assignees

SHENZHEN HELLO TECH ENERGY CO., LTD

Dates

Publication Date: 20260507
Application Date: 20251229
Priority Date: 20250821

Claims (20)

1 . A power supply system for backup power supply to a household load, the power supply system comprising: an all-in-one energy storage unit having a grid-connected port and an off-grid port; and a parallel socket comprising: a grid-connected receptacle connected to a main distribution box at a grid side, wherein the grid-connected port is connected to the grid-connected receptacle through a first pluggable connector; an off-grid receptacle, wherein the off-grid port is connected to the off-grid receptacle through a second pluggable connector; a generator receptacle configured to connect to a power supply port of a fuel-powered generator through a third pluggable connector, wherein both the off-grid receptacle and the generator receptacle are connected to a sub-distribution box at a load side; and a bypass switch connected between the grid-connected receptacle and the off-grid receptacle; wherein the power supply system is configured to: when the all-in-one energy storage unit is in an off-grid state and a power supply from the off-grid port of the all-in-one energy storage unit meets a load demand of the sub-distribution box, switch off the bypass switch; and when the all-in-one energy storage unit is in the off-grid state and the power supply from the off-grid port of the all-in-one energy storage unit fails to meet the load demand of the sub-distribution box, control the fuel-powered generator to start; and in response to that the fuel-powered generator meets a startup condition, control the all-in-one energy storage unit to switch from the off-grid state to a grid-connected state and switch on the bypass switch, wherein after the all-in-one energy storage unit is switched to the grid-connected state, the all-in-one energy storage unit and the fuel-powered generator jointly supply power to a load of the sub-distribution box through the grid-connected port and the power supply port, respectively.
2 . The power supply system according to claim 1 , further comprising: a control module in a communication connection with a remote user terminal, wherein the control module is configured to control, based on an instruction transmitted by the remote user terminal, the all-in-one energy storage unit to switch from the off-grid state to the grid-connected state or from the grid-connected state to the off-grid state.
3 . The power supply system according to claim 2 , wherein the control module further comprises: a first communication module disposed in the all-in-one energy storage unit; and a second communication module disposed in the parallel socket, wherein the control module is in the communication connection with the remote user terminal through the first communication module and the second communication module.
4 . The power supply system according to claim 1 , wherein the all-in-one energy storage unit comprises: a first switch; a second switch; a power terminal connected to the grid-connected port through the first switch and connected to the off-grid port through the second switch; and a power convert system, wherein the power supply system is configured to: detect a voltage of a grid at the grid-connected port and a generator voltage at the generator receptacle; and when the voltage of the grid is greater than a first predetermined voltage or the generator voltage is greater than a second predetermined voltage, control, by the power convert system, the first switch to be switched on and the second switch to be switched off, to switch the all-in-one energy storage unit to the grid-connected state; and when the voltage of the grid is smaller than or equal to the first predetermined voltage and the generator voltage is smaller than or equal to the second predetermined voltage, control, by the power convert system, the second switch to be switched on and the first switch to be switched off, to switch the all-in-one energy storage unit to the off-grid state.
5 . The power supply system according to claim 4 , further comprising: a third switch, wherein the main distribution box is connected to the grid through the third switch, wherein the power supply system is configured to control, when the voltage of the grid is smaller than or equal to the first predetermined voltage, the third switch to be switched off.
6 . The power supply system according to claim 4 , further comprising: a first photovoltaic power generation system connected to the main distribution box, wherein: the power convert system is in a communication connection with the bypass switch; and the power convert system is configured to: control, when the first switch is switched on, the bypass switch to be switched on; and control, when the second switch is switched on and the first photovoltaic power generation system is turned on, the bypass switch to be switched on.
7 . The power supply system according to claim 4 , further comprising: a first photovoltaic power generation system connected to the main distribution box, wherein: the bypass switch is in a communication connection with a remote user terminal; and the bypass switch is configured to be switched on under control of the remote user terminal when the second switch is switched on and the first photovoltaic power generation system is turned on.
8 . The power supply system according to claim 4 , wherein: the power convert system is in a communication connection with the bypass switch; and the power convert system is configured to: detect a voltage signal at the power terminal; and control the bypass switch to be switched on when the voltage signal is abnormal.
9 . The power supply system according to claim 6 , wherein the parallel socket comprises a manual switch, the grid-connected receptacle being connected to the off-grid receptacle through the manual switch.
10 . The power supply system according to claim 4 , wherein the all-in-one energy storage unit further comprises an MPPT module and a battery pack, wherein: the MPPT module and the battery pack are connected to the power terminal through a control circuit; and the power convert system is configured to: control, when the first switch is switched on, the control circuit to control the MPPT module and/or the battery pack to supply power at a constant current through the power terminal; and control, when the second switch is switched on, the control circuit to control the MPPT module and/or the battery pack to supply power at a constant voltage through the power terminal.
11 . The power supply system according to claim 10 , further comprising: a second photovoltaic power generation system connected to the MPPT module.
12 . The power supply system according to claim 1 , wherein each of the first pluggable connector and the second pluggable connector is fixedly connected to the parallel socket through a snap-fit or a threaded engagement.
13 . A parallel socket, applied in a power supply system for backup power supply to a household load, wherein the power supply system comprises an all-in-one energy storage unit, the all-in-one energy storage unit having a grid-connected port and an off-grid port, and wherein the parallel socket comprises: a grid-connected receptacle connected to a main distribution box at a grid side, wherein the grid-connected port is connected to the grid-connected receptacle through a first pluggable connector; an off-grid receptacle, wherein the off-grid port is connected to the off-grid receptacle through a second pluggable connector; a generator receptacle configured to connect to a power supply port of a fuel-powered generator through a third pluggable connector, wherein both the off-grid receptacle and the generator receptacle are connected to a sub-distribution box at a load side; and a bypass switch connected between the grid-connected receptacle and the off-grid receptacle; wherein the parallel socket is configured to: when the all-in-one energy storage unit is in an off-grid state and a power supply from the off-grid port of the all-in-one energy storage unit meets a load demand of the sub-distribution box, switch off the bypass switch; and when the all-in-one energy storage unit is in the off-grid state and the power supply from the off-grid port of the all-in-one energy storage unit fails to meet the load demand of the sub-distribution box, control the fuel-powered generator to start; and in response to that the fuel-powered generator meets a startup condition, control the all-in-one energy storage unit to switch from the off-grid state to a grid-connected state and switch on the bypass switch, allowing the all-in-one energy storage unit and the fuel-powered generator to jointly supply power to a load of the sub-distribution box through the grid-connected port and the power supply port, respectively.
14 . The parallel socket according to claim 13 , wherein the power supply system comprises: a control module comprising a first control module disposed in the all-in-one energy storage unit and a second control module disposed in the parallel socket, wherein: each of the first control module and the second control module is in a communication connection with a remote user terminal; and the first control module and the second control module are configured to control, based on an instruction transmitted by the remote user terminal, the all-in-one energy storage unit to switch from the off-grid state to the grid-connected state or from the grid-connected state to the off-grid state.
15 . The parallel socket according to claim 14 , wherein the control module further comprises: a first communication module disposed in the all-in-one energy storage unit and connected to the first control module, wherein the first control module is in a communication connection with the remote user terminal through the first communication module; and a second communication module disposed in the parallel socket and connected to the second control module, wherein the second control module is in a communication connection with the remote user terminal through the second communication module.
16 . The parallel socket according to claim 13 , wherein the all-in-one energy storage unit comprises: a first switch; a second switch; a power terminal connected to the grid-connected port through the first switch and connected to the off-grid port through the second switch; and a power convert system, wherein the power supply system is configured to: detect a voltage of a grid at the grid-connected port and a generator voltage at the generator receptacle; and when the voltage of the grid is greater than a first predetermined voltage or the generator voltage is greater than a second predetermined voltage, control, by the power convert system, the first switch to be switched on and the second switch to be switched off, to switch the all-in-one energy storage unit to the grid-connected state; and when the voltage of the grid is smaller than or equal to the first predetermined voltage and the generator voltage is smaller than or equal to the second predetermined voltage, control, by the power convert system, the second switch to be switched on and the first switch to be switched off, to switch the all-in-one energy storage unit to the off-grid state; and wherein the power supply system comprises a first photovoltaic power generation system connected to the main distribution box, wherein the power convert system is in a communication connection with the bypass switch, and wherein the power convert system is configured to: control, when the first switch is switched on, the bypass switch to be switched on; and control, when the second switch is switched on and the first photovoltaic power generation system is turned on, the bypass switch to be switched on.
17 . The parallel socket according to claim 13 , wherein the all-in-one energy storage unit comprises: a first switch; a second switch; a power terminal connected to the grid-connected port through the first switch and connected to the off-grid port through the second switch; and a power convert system, wherein the power supply system is configured to: detect a voltage of a grid at the grid-connected port and a generator voltage at the generator receptacle; and when the voltage of the grid is greater than a first predetermined voltage or the generator voltage is greater than a second predetermined voltage, control, by the power convert system, the first switch to be switched on and the second switch to be switched off, to switch the all-in-one energy storage unit to the grid-connected state; and when the voltage of the grid is smaller than or equal to the first predetermined voltage and the generator voltage is smaller than or equal to the second predetermined voltage, control, by the power convert system, the second switch to be switched on and the first switch to be switched off, to switch the all-in-one energy storage unit to the off-grid state; and wherein the power supply system comprises a first photovoltaic power generation system connected to the main distribution box, wherein the bypass switch is in a communication connection with a remote user terminal, and wherein the bypass switch is configured to be switched on under control of the remote user terminal when the second switch is switched on and the first photovoltaic power generation system is turned on.
18 . The parallel socket according to claim 13 , wherein the all-in-one energy storage unit comprises: a first switch; a second switch; a power terminal connected to the grid-connected port through the first switch and connected to the off-grid port through the second switch; and a power convert system in a communication connection with the bypass switch, the power convert system being configured to: detect a voltage signal at the power terminal; and control the bypass switch to be switched on when the voltage signal is abnormal, wherein the power supply system is configured to: detect a voltage of a grid at the grid-connected port and a generator voltage at the generator receptacle; and when the voltage of the grid is greater than a first predetermined voltage or the generator voltage is greater than a second predetermined voltage, control, by the power convert system, the first switch to be switched on and the second switch to be switched off, to switch the all-in-one energy storage unit to the grid-connected state; and when the voltage of the grid is smaller than or equal to the first predetermined voltage and the generator voltage is smaller than or equal to the second predetermined voltage, control, by the power convert system, the second switch to be switched on and the first switch to be switched off, to switch the all-in-one energy storage unit to the off-grid state.
19 . The parallel socket according to claim 16 , further comprising: a manual switch, the grid-connected receptacle being connected to the off-grid receptacle through the manual switch.
20 . A method for controlling a power supply system, the method being applied in the power supply system according to claim 1 , wherein the all-in-one energy storage unit comprises a first switch, a second switch, a power convert system, and a power terminal, the power terminal being connected to the grid-connected port through the first switch and connected to the off-grid port through the second switch, and wherein the method comprises: obtaining a voltage of a grid when the all-in-one energy storage unit is in a grid-connected state; when the voltage of the grid is smaller than a first predetermined voltage, switching off the first switch and the bypass switch, and switching on the second switch; obtaining demand power at the load side and a remaining battery level of the all-in-one energy storage unit; controlling, when power of the all-in-one energy storage unit is smaller than the demand power or the remaining battery level of the all-in-one energy storage unit is smaller than a predetermined value, the fuel-powered generator to start; and in response to that the fuel-powered generator meets a startup condition, switching on the first switch and the bypass switch, and switching off the second switch.

Description

This application claims priority to PCT Application No. PCT/CN2025/116223, filed on Aug. 21, 2025, the entire contents of which are incorporated herein by reference. FIELD The present disclosure relates to the field of power supply device technologies, and more particularly, to a power supply system, a parallel socket, and a method for controlling a power supply system. BACKGROUND To address electricity shortfalls during power outages, a household user typically relies on both an energy storage device and a fuel-powered generator to provide backup power for a core load. However, it was realized that the energy storage device is connected to a grid through a grid-connected port and a distribution box, requiring a professional electrician to wire the energy storage device to the distribution box. Similarly, the fuel-powered generator needs to be connected to the distribution box through an auto transfer switch (ATS), which also necessitates a professional electrician to wire the ATS to the distribution box. Both the energy storage device and the fuel-powered generator depend on professional electricians for complex wiring work in the distribution box, resulting not only in high mounting costs but also in cluttered wiring within the distribution box. Further, the energy storage device and the fuel-powered generator operate independently of each other. Although the energy storage device can seamlessly take over power supply during a power outage of the grid, the user has to manually switch to the fuel-powered generator when a battery of the energy storage device is depleted. Since the fuel-powered generator requires approximately 10 seconds to start up, the load will inevitably experience a power interruption during switching, significantly affecting power outage-sensitive loads (such as computers). Consequently, existing solutions suffer from drawbacks including complex and costly mounting, a power interruption to a load during switching, and a need for manual intervention, all of which substantially affecting user experience. SUMMARY Embodiments of the present disclosure provide a power supply system, a parallel socket, and a method for controlling a power supply system. In a first aspect, the present disclosure provides a power supply system for backup power supply to a household load. The power supply system includes: an all-in-one energy storage unit having a grid-connected port and an off-grid port; and a parallel socket. The parallel socket includes: a grid-connected receptacle connected to a main distribution box at a grid side, the grid-connected port being connected to the grid-connected receptacle through a first pluggable connector; an off-grid receptacle, the off-grid port being connected to the off-grid receptacle through a second pluggable connector; a generator receptacle configured to connect to a power supply port of a fuel-powered generator through a third pluggable connector, both the off-grid receptacle and the generator receptacle being connected to a sub-distribution box at a load side; and a bypass switch connected between the grid-connected receptacle and the off-grid receptacle. The power supply system is configured to: when the all-in-one energy storage unit is in an off-grid state and a power supply from the off-grid port of the all-in-one energy storage unit meets a load demand of the sub-distribution box, switch off the bypass switch; and when the all-in-one energy storage unit is in the off-grid state and the power supply from the off-grid port of the all-in-one energy storage unit fails to meet the load demand of the sub-distribution box, control the fuel-powered generator to start; and in response to the fuel-powered generator meeting a startup condition, control the all-in-one energy storage unit to switch from the off-grid state to a grid-connected state and switch on the bypass switch. After the all-in-one energy storage unit is switched to the grid-connected state, the all-in-one energy storage unit and the fuel-powered generator jointly supply power to a load of the sub-distribution box through the grid-connected port and the power supply port, respectively. In a second aspect, the present disclosure provides a parallel socket. The parallel socket is applied in a power supply system for backup power supply to a household load. The power supply system includes an all-in-one energy storage unit. The all-in-one energy storage unit has a grid-connected port and an off-grid port. The parallel socket includes: a grid-connected receptacle connected to a main distribution box at a grid side, the grid-connected port being connected to the grid-connected receptacle through a first pluggable connector; an off-grid receptacle, the off-grid port being connected to the off-grid receptacle through a second pluggable connector; a generator receptacle configured to connect to a power supply port of a fuel-powered generator through a third pluggable connector, both the off-grid receptacle an