CN-122001351-A - Switching system and electrical device

CN122001351ACN 122001351 ACN122001351 ACN 122001351ACN-122001351-A

Abstract

The application provides a switching system and electrical equipment, wherein the switching system comprises a semiconductor switching unit and a current suppression unit, a first end of the semiconductor switching unit is connected to a positive electrode of a power supply, a second end of the semiconductor switching unit is connected with a first end of the current suppression unit, a third end of the semiconductor switching unit is connected with a second end of the current suppression unit, a third end of the semiconductor switching unit is connected with one end of a load, and third ends of the current suppression unit are respectively connected to a negative electrode of the power supply and the other end of the load. Compared with the switch circuit in the prior art, the circuit space and the circuit cost are further saved, so that the volume of the switch system is reduced, and the use of the switch system is more convenient.

Inventors

REN SILONG
Qiao Sijian
HUANG YINFANG
WU YI
GONG ZUOYONG
SUN ZHIWEN
WU YIFEI

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 (11)

1. A switching system is characterized by comprising a semiconductor switching unit and a current suppressing unit; The first end of the semiconductor switch unit is connected to the positive electrode of the power supply, the second end of the semiconductor switch unit is connected with the first end of the current suppression unit, the third end of the semiconductor switch unit is connected with the second end of the current suppression unit, and the third end of the semiconductor switch unit is connected with one end of the load; and the third end of the current suppression unit is respectively connected to the negative electrode of the power supply and the other end of the load.
2. The switching system of claim 1, further comprising a main mechanical switching unit; One end of the main mechanical switch unit is connected with the first end of the semiconductor switch unit, one end of the main mechanical switch unit is connected to the positive electrode of the power supply, the other end of the main mechanical switch unit is respectively connected with the third end of the semiconductor switch unit and the second end of the current suppression unit, and the other end of the main mechanical switch unit is connected to one end of the load.
3. The switching system according to claim 1, wherein the current suppressing unit includes a switching circuit module and a suppressing circuit module; One end of the switch circuit module is connected with the second end of the semiconductor switch unit, and the other end of the switch circuit module is connected with the first end of the suppression circuit module; the second end of the suppression circuit module is connected with the third end of the semiconductor switch unit and the other end of the main mechanical switch unit respectively, and the second end of the suppression circuit module is connected to one end of a load; And the third end of the suppression circuit module is respectively connected with the other end of the load and the negative electrode of the power supply.
4. The switching system according to claim 3, wherein the switching circuit module comprises a first semiconductor switch, a first resistor, and a driving unit; the first end of the first semiconductor switch is connected with the second end of the semiconductor switch unit, and the second end of the first semiconductor switch is connected with one end of the first resistor; the other end of the first resistor is connected with the first end of the suppression circuit module; the driving control unit is respectively connected with a third end of the first semiconductor switch, one end of the first resistor and the other end of the first resistor; the driving control unit is used for controlling the on-off of the first semiconductor switch according to the voltage at the two ends of the first resistor.
5. The switching system of claim 4, wherein the suppression circuit module comprises an inductance component and a diode component; one end of the inductance component is respectively connected with the other end of the first resistor and the negative electrode of the diode component; the other end of the inductance component is connected with the third end of the semiconductor switch unit and the other end of the main mechanical switch unit respectively, and the other end of the inductance component is connected to one end of a load; The positive pole of diode subassembly is connected with the other end of load and the negative pole of power respectively.
6. The switching system of claim 2, wherein the main mechanical switching unit comprises a first switch; one end of the first switch is connected with the first end of the semiconductor switch unit, and one end of the first switch is connected to the positive electrode of the power supply; the other end of the first switch is connected with the third end of the semiconductor switch unit and the other end of the inductance component respectively, and the other end of the first switch is connected to one end of a load.
7. The switching system according to claim 1, wherein the semiconductor switching unit comprises a second switch and a semiconductor module; One end of the second switch is connected with one end of the first switch, and one end of the second switch is connected to the positive electrode of the power supply; the other end of the semiconductor module is connected with the other end of the main mechanical switch unit and the second end of the current suppression unit respectively, and the other end of the semiconductor module is connected to one end of a load.
8. The switching system of claim 7, wherein the semiconductor module comprises a second semiconductor switch, a snubber leg, and an energy absorbing assembly; one end of the second semiconductor switch is respectively connected with the first end of the first semiconductor switch, the other end of the second switch, one end of the buffer branch and one end of the energy absorption component; The other end of the second semiconductor switch is connected with the other end of the inductance component, the other end of the buffer branch and the other end of the energy absorption component respectively, and the other end of the second semiconductor switch is connected to one end of a load.
9. The switching system of claim 8, wherein the buffer branch comprises a capacitive component and a second resistor; One end of the second resistor is respectively connected with one end of the second semiconductor switch, the first end of the first semiconductor switch, the other end of the second switch and one end of the energy absorbing component; The other end of the second resistor is connected with one end of the capacitor assembly; The other end of the capacitor assembly is connected with the other end of the second semiconductor switch, the other end of the inductor assembly and the other end of the energy absorbing assembly respectively, and the other end of the capacitor assembly is connected to one end of a load.
10. The switching system of claim 8, wherein the energy absorbing assembly comprises a metal oxide varistor; one end of the metal oxide piezoresistor is respectively connected with one end of the second semiconductor switch, the first end of the first semiconductor switch, the other end of the second switch and one end of the buffer branch; The other end of the metal oxide piezoresistor is respectively connected with the other end of the inductance component, the other end of the buffer branch and the other end of the second semiconductor switch, and the other end of the metal oxide piezoresistor is connected to one end of a load.
11. 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 circuit breakers, in particular to a switching system and electrical equipment. Background The solid-state circuit breaker utilizes advanced semiconductor technology, can realize accurate control and the timely interruption of electric current in microsecond magnitude, and has great significance to the prevention of short-circuit faults and the enhancement of the overall safety of the system. When the load in the solid-state circuit breaker has a large capacitance, then the solid-state circuit breaker will have a large rush current during the start-up phase, and how to suppress the rush current is important for the solid-state circuit breaker. In the prior art, a combined inductor is generally connected in series in a main loop of a circuit breaker to inhibit rapid rising of an impact current, but a mechanical switch participating in short-circuit breaking in the combined inductor connected in series needs a corresponding current-carrying section, so that the conventional circuit for inhibiting the impact current is complex. 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 reduce the complexity of the circuit. In order to achieve the above purpose, the technical scheme adopted by the embodiment of the application is as follows: In a first aspect, an embodiment of the present application provides a switching system including a semiconductor switching unit and a current suppressing unit; The first end of the semiconductor switch unit is connected to the positive electrode of the power supply, the second end of the semiconductor switch unit is connected with the first end of the current suppression unit, the third end of the semiconductor switch unit is connected with the second end of the current suppression unit, and the third end of the semiconductor switch unit is connected with one end of the load; and the third end of the current suppression unit is respectively connected to the negative electrode of the power supply and the other end of the load. Optionally, the system further comprises a main mechanical switching unit; One end of the main mechanical switch unit is connected with the first end of the semiconductor switch unit, one end of the main mechanical switch unit is connected to the positive electrode of the power supply, the other end of the main mechanical switch unit is respectively connected with the third end of the semiconductor switch unit and the second end of the current suppression unit, and the other end of the main mechanical switch unit is connected to one end of the load. Optionally, the current suppression unit comprises a switch circuit module and a suppression circuit module; One end of the switch circuit module is connected with the second end of the semiconductor switch unit, and the other end of the switch circuit module is connected with the first end of the suppression circuit module; The second end of the suppression circuit module is connected with the third end of the semiconductor switch unit and the other end of the main mechanical switch unit respectively, and the second end of the suppression circuit module is connected to one end of a load; And the third end of the suppression circuit module is respectively connected with the other end of the load and the negative electrode of the power supply. Optionally, the switch circuit module comprises a first semiconductor switch, a first resistor and a driving control unit; the first end of the first semiconductor switch is connected with the second end of the semiconductor switch unit, and the second end of the first semiconductor switch is connected with one end of the first resistor; the other end of the first resistor is connected with the first end of the suppression circuit module; the driving control unit is respectively connected with a third end of the first semiconductor switch, one end of the first resistor and the other end of the first resistor; the driving control unit is used for controlling the on-off of the first semiconductor switch according to the voltage at the two ends of the first resistor. Optionally, the suppression circuit module comprises an inductance component and a diode component; one end of the inductance component is respectively connected with the other end of the first resistor and the negative electrode of the diode component; the other end of the inductance component is connected with the third end of the semiconductor switch unit and the other end of the main mechanical switch unit respectively, and the other end of the inductance component is connected to one end of a load; The positive pole of diode subassembly is connected with the other end of load and the negative pole of power respectively. Optionally, the main mechanical switch unit comprises a first switc