Solid state breaker and power supply system
The present disclosure provides a solid state breaker and a power supply system. The breaker includes: a first port and a second port configured to connect a first external system; a third port and a fourth port configured to connect a second external system; a first electronic switch connected between the first port and the third port; a second electronic switch connected between the second port and the fourth port; and a control unit configured to control the first electronic switch and the second electronic switch to be turned off in a case of detecting an electricity leakage occurs in the second external system. The breaker is provided with electronic switches at both poles, so that it can provide effective protection for the human body by quickly turning off the electronic switches provided at both poles, in a case of an electricity leakage of the prosumer to the ground.
1 . A solid state breaker, comprising:
a first port and a second port configured to connect a first external system;
a third port and a fourth port configured to connect a second external system configured to both consume and supply power;
a first electronic switch connected between the first port and the third port;
a second electronic switch connected between the second port and the fourth port; and
a control unit configured to:
detect an electricity leakage in the second external system by detecting a voltage difference between the third port and the fourth port; and
control the first electronic switch and the second electronic switch to be turned off upon detecting the electricity leakage in the second external system.
2 . The solid state breaker according to claim 1 , further comprising:
a first voltage stabilizing unit connected in parallel with the first electronic switch, wherein the first voltage stabilizing unit is configured to stabilize a first voltage of the first electronic switch within a first predetermined range.
3 . The solid state breaker according to claim 2 , wherein the first voltage stabilizing unit is a first bidirectional voltage stabilizing diode, wherein one end of the first bidirectional voltage stabilizing diode is connected with a first end of the first electronic switch, and wherein another end of the first bidirectional voltage stabilizing diode is connected with a second end of the first electronic switch.
4 . The solid state breaker according to claim 3 , further comprising:
a second voltage stabilizing unit connected in parallel with the second electronic switch, wherein the second voltage stabilizing unit is configured to stabilize a second voltage of the second electronic switch within a second predetermined range.
5 . The solid state breaker according to claim 4 , wherein the second voltage stabilizing unit is a second bidirectional voltage stabilizing diode, wherein one end of the second bidirectional voltage stabilizing diode is connected with a first end of the second electronic switch, and wherein another end of the second bidirectional voltage stabilizing diode is connected with a second end of the second electronic switch.
6 . The solid state breaker according to claim 1 , further comprising:
a current regulating unit connected between the first port and the first electronic switch, wherein the current regulating unit is configured for making current variation of a current passing through the first electronic switch meet a predetermined condition.
7 . The solid state breaker according to claim 6 , wherein the solid state breaker further comprises a first mechanical switch connected between the first port and the first electronic switch, and wherein the current regulating unit comprises an inductor connected between the first mechanical switch and the first electronic switch.
8 . The solid state breaker according to claim 1 , further comprising:
a first mechanical switch connected between the first port and the first electronic switch, wherein the first mechanical switch is connected in series with the first electronic switch; and
a second mechanical switch connected between the second port and the second electronic switch, wherein the second mechanical switch is connected in series with the second electronic switch.
9 . The solid state breaker according to claim 8 , wherein the second mechanical switch is set in linkage with the first mechanical switch such the first and second mechanical switches simultaneously open or close.
10 . The solid state breaker according to claim 1 , wherein the first electronic switch and/or the second electronic switch is an electronic switch based on a metal oxide semiconductor, and wherein the first external system comprises a microgrid.
11 . A power supply system comprising:
a solid state breaker, comprising:
a first port and a second port configured to connect a first external system;
a third port and a fourth port configured to connect a second external system;
a first electronic switch connected between the first port and the third port;
a second electronic switch connected between the second port and the fourth port; and
a control unit configured to detect an electricity leakage in the second external system by detecting a voltage difference between the third port and the fourth port, wherein the control unit is further configured to control the first electronic switch and the second electronic switch to be turned off upon detecting the electricity leakage in the second external system;
a power supply connected, as the first external system, with the first port and the second port of the solid state breaker; and
a power prosumer system connected, as the second external system, with the third port and the fourth port of the solid state breaker, the power prosumer system having power consumption capacity and power generation capacity.
12 . The power supply system according to claim 11 , wherein the solid state breaker further comprises a first voltage stabilizing unit connected in parallel with the first electronic switch, and wherein the first voltage stabilizing unit is configured to stabilize a voltage of the first electronic switch within a predetermined range.
13 . The power supply system according to claim 12 , wherein the first voltage stabilizing unit is a first bidirectional voltage stabilizing diode, wherein one end of the first bidirectional voltage stabilizing diode is connected with a first end of the first electronic switch, and wherein another end of the first bidirectional voltage stabilizing diode is connected with a second end of the first electronic switch.
14 . The power supply system according to claim 11 , wherein the solid state breaker further comprises a second voltage stabilizing unit connected in parallel with the second electronic switch, and wherein the second voltage stabilizing unit is configured to stabilize a voltage of the second electronic switch within a predetermined range.
15 . The power supply system according to claim 14 , wherein the second voltage stabilizing unit is a second bidirectional voltage stabilizing diode, wherein one end of the second bidirectional voltage stabilizing diode is connected with a first end of the second electronic switch, and wherein another end of the second bidirectional voltage stabilizing diode is connected with a second end of the second electronic switch.
16 . The power supply system according to claim 11 , wherein the solid state breaker further comprises a current regulating unit connected between the first port and the first electronic switch, and wherein the current regulating unit is configured for making current variation of a current passing through the first electronic switch meet a predetermined condition.
17 . The power supply system according to claim 11 , wherein the current regulating unit comprises an inductor connected in series with the first electronic switch.
18 . The power supply system according to claim 11 , wherein the solid state breaker further comprises:
a first mechanical switch connected between the first port and the first electronic switch, wherein the first mechanical switch is connected in series the first electronic switch; and
a second mechanical switch connected between the second port and the second electronic switch, wherein the second mechanical switch is connected in series with the second electronic switch.
19 . The power supply system according to claim 18 , wherein the control unit is disposed between a first pair of mechanical switches and a second pair of electronic switches, wherein the first pair includes the first and second mechanical switches, and wherein the second pair includes the first and second electronic switches.
20 . The power supply system according to claim 11 , wherein the power supply comprises a 750-volt microgrid power supply.