CN-122001349-A - Switching system and electrical device

CN122001349ACN 122001349 ACN122001349 ACN 122001349ACN-122001349-A

Abstract

The application provides a switching system and electrical equipment, and relates to the technical field of switching appliances. The switching system comprises a first sub-switching system, the first sub-switching system comprises a switching unit and a current suppression unit, the switching unit is connected in series with the current suppression unit, one end of the switching unit is connected with a positive electrode of a power supply, the other end of the switching unit is connected with the current suppression unit, the other end of the current suppression unit is used for being connected with a load, the current suppression unit comprises a combined inductance module, the combined inductance module comprises a driving control unit, a semiconductor switch, a first resistor and an inductor, the first end of the semiconductor switch is connected with the switching unit, the second end of the semiconductor switch is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the inductor, the second end of the inductor is used for being connected with the load, the first end of the driving control unit is connected with the third end of the semiconductor switch, and the second end and the third end of the driving control unit are respectively connected with the two ends of the first resistor. The volume of the switch system is reduced by the scheme.

Inventors

HUANG YINFANG
GONG ZUOYONG
PENG QIONG
WU YI
WU YIFEI
Shan Tianpei

Assignees

上海良信电器股份有限公司
西安交通大学

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (10)

1. The switching system is characterized by comprising a first sub-switching system, wherein the first sub-switching system comprises a switching unit and a current suppression unit, and the switching unit is connected with the current suppression unit in series; one end of the switch unit is connected with the positive electrode of the power supply, and the other end of the switch unit is connected with the current suppression unit; The current suppression unit comprises a combined inductance module; the combined inductance module comprises a driving control unit, a semiconductor switch, a first resistor and an inductance; the first end of the semiconductor switch is connected with the switch unit, the second end of the semiconductor switch is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the inductor, and the second end of the inductor is used for connecting a load; The first end of the driving control unit is connected with the third end of the semiconductor switch, the second end of the driving control unit is connected with the first end of the first resistor, and the third end of the driving control unit is connected with the second end of the first resistor; The current suppressing unit is used for suppressing the impact current generated in the circuit when the capacitive load is connected.
2. The switching system of claim 1, wherein the combined inductance module further comprises a diode; the anode of the diode is used for being connected with a load and the cathode of the power supply respectively; the negative pole of diode is connected with the first end of inductance.
3. The switching system of claim 1, wherein the current suppressing unit further comprises a first mechanical switch; The first mechanical switch is connected in parallel to two sides of the combined inductance module.
4. The switching system of claim 1, wherein the switching unit comprises a switching leg comprising a power device; the first end of the power device is connected with the positive electrode of the power supply, and the second end of the power device is connected with the first end of the semiconductor switch.
5. The switching system of claim 4, wherein the switching unit further comprises a buffer branch and an energy absorbing branch; The switching leg, the buffer leg and the energy absorbing leg are connected in parallel with one another.
6. The switching system, as set forth in claim 5, The buffer branch circuit comprises a second resistor and a capacitor; The first end of the second resistor is connected with the first end of the power device; the second end of the capacitor is connected with the second end of the power device.
7. The switching system, as set forth in claim 5, The energy absorbing branch includes an energy absorbing element; The first end of the energy absorbing element is connected with the first end of the power device, and the second end of the energy absorbing element is connected with the second end of the power device.
8. The switching system of claim 4, wherein the first sub-switching system further comprises a disconnector, the disconnector being connected in series with the switching unit; The first end of the isolating switch is connected with the positive electrode of the power supply, and the second end of the isolating switch is connected with the first end of the power device.
9. The switching system of claim 8, further comprising a second sub-switching system, the second sub-switching system comprising a second mechanical switch; the first end of the second mechanical switch is connected with the first end of the isolating switch, and the second end of the second mechanical switch is connected with the second end of the inductor.
10. An electrical device comprising the switching system of any one of claims 1-9; the switching system is used for protecting the electric equipment.

Description

Switching system and electrical device Technical Field The application relates to the technical field of switching appliances, in particular to a switching system and electrical equipment. Background Solid state circuit breakers play an important role in power systems, particularly in handling inrush currents. The rush current, also called surge current, usually occurs at the moment of circuit turn-on, and an instantaneous current far greater than a normal operation current is generated due to charge and discharge characteristics of elements such as a capacitor and an inductor. For solid state circuit breakers, how to effectively handle and handle the surge current is critical to ensure stable, reliable operation. Currently, rapid rise of inrush current is often suppressed by connecting in series in the main circuit of a solid state circuit breaker an inductor having the same rated current carrying capacity as the main circuit. However, as the rated current increases, the volume of the required inductor increases greatly, resulting in an increase in the volume and cost of the switching system as a whole. Disclosure of Invention The present application aims to solve the above-mentioned drawbacks of the prior art and to provide a switching system and an electrical device which are capable of reducing the volume and cost of a circuit as much as possible while suppressing an impact current. In order to achieve the above purpose, the technical scheme adopted by the embodiment of the application is as follows: in a first aspect, the embodiment of the application provides a switch system, which comprises a first sub-switch system, wherein the first sub-switch system comprises a switch unit and a current suppression unit, and the switch unit is connected with the current suppression unit in series; one end of the switch unit is connected with the positive electrode of the power supply, and the other end of the switch unit is connected with the current suppression unit; The current suppression unit comprises a combined inductance module; the combined inductance module comprises a driving control unit, a semiconductor switch, a first resistor and an inductance; the first end of the semiconductor switch is connected with the switch unit, the second end of the semiconductor switch is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the inductor, and the second end of the inductor is used for connecting a load; The first end of the driving control unit is connected with the third end of the semiconductor switch, the second end of the driving control unit is connected with the first end of the first resistor, and the third end of the driving control unit is connected with the second end of the first resistor; The current suppressing unit is used for suppressing the impact current generated in the circuit when the capacitive load is connected. Optionally, the combined inductance module further comprises a diode; the anode of the diode is used for being connected with a load and the cathode of the power supply respectively; the negative pole of diode is connected with the first end of inductance. Optionally, the current suppressing unit further comprises a first mechanical switch; The first mechanical switch is connected in parallel to two sides of the combined inductance module. Optionally, the switch unit comprises a switch branch, wherein the switch branch comprises a power device; the first end of the power device is connected with the positive electrode of the power supply, and the second end of the power device is connected with the first end of the semiconductor switch. Optionally, the switch unit further comprises a buffer branch and an energy absorption branch; The switching leg, the buffer leg and the energy absorbing leg are connected in parallel with one another. Optionally, the buffer branch comprises a second resistor and a capacitor; The first end of the second resistor is connected with the first end of the power device; the second end of the capacitor is connected with the second end of the power device. Optionally, the energy absorbing branch comprises an energy absorbing element; The first end of the energy absorbing element is connected with the first end of the power device, and the second end of the energy absorbing element is connected with the second end of the power device. Optionally, the first sub-switch system further comprises an isolating switch, wherein the isolating switch is connected with the switch unit in series; The first end of the isolating switch is connected with the positive electrode of the power supply, and the second end of the isolating switch is connected with the first end of the power device. Optionally, the switch system further comprises a second sub-switch system, wherein the second sub-switch system comprises a second mechanical switch; the first end of the second mechanical switch is connected wi