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CN-122025473-A - High-power MEMS (micro-electromechanical systems) switching system and method based on time sequence cooperative arc suppression

CN122025473ACN 122025473 ACN122025473 ACN 122025473ACN-122025473-A

Abstract

The invention belongs to the technical field of micro motors and discloses a high-power MEMS (micro electro mechanical systems) switching system and method based on time sequence cooperative arc suppression. The system comprises a load circuit, an arc suppression module and a time sequence control circuit, wherein the arc suppression module consists of an LC arc extinguishing branch and a capacitor charging and discharging branch, the LC arc extinguishing branch is connected in parallel with two ends of a MEMS main switch and used for establishing a near-zero voltage environment at the moment of switching on and off, the time sequence control circuit adopts a full hardware logic architecture to generate a multi-path control signal with an accurate time delay relation and cooperatively controls capacitor precharge, resonance current conversion and main switch actions. The LC resonance commutation is actively triggered before the main switch contacts are mechanically closed or separated, so that the load current is forcedly transferred, and the arc-free connection and disconnection are realized. The invention effectively solves the problem that the high-power micro-electromechanical switch is difficult to inhibit the electric arc in the breaking process, and improves the reliability and the service life of the switch.

Inventors

  • MA BO
  • ZHANG KUNYANG
  • GUO XU
  • YOU ZHENG

Assignees

  • 华中科技大学

Dates

Publication Date
20260512
Application Date
20260130

Claims (10)

  1. 1. A high power MEMS switching system based on time sequential collaborative arc suppression, the system comprising a load circuit, an arc suppression module, and a time sequential control circuit, wherein: The load circuit comprises a main power supply (1), a load (2) and a third switch (3), and the three are connected in series to form a loop; The arc suppression module is used for avoiding the generation of an arc in the third switch, and comprises an LC arc extinguishing branch and a capacitor charging and discharging branch, wherein: The LC arc-extinguishing branch is connected in parallel with two ends of the third switch and is used for establishing and maintaining an approximately zero potential interval far lower than breakdown voltage for the two ends of a third switch contact, and the LC arc-extinguishing branch comprises a rectifying circuit (4), an inductor (5), a diode (6), a second switch (7) and a capacitor (8) which are connected in sequence; The capacitor charging and discharging branch circuit provides an initial preset voltage for the capacitor, the capacitor charging and discharging branch circuit comprises an auxiliary power supply (10) and a first switch (9), and the first switch (9) is arranged between the capacitor (8) and the auxiliary power supply (10); the time sequence control circuit (11) is connected with the first switch (9), the second switch (7) and the third switch (3) at the same time, and is used for judging whether the current electric signal jumps to be high level or low level, and controlling the opening and closing of the first switch, the second switch and the third switch according to the judging result.
  2. 2. The high power MEMS switching system of claim 1, wherein the LC quenching arm is a single-stage or multi-stage resonant network structure.
  3. 3. The high-power MEMS switching system as recited in claim 1, wherein said timing control circuit (11) is configured to determine a single input signal and output the single input signal as three cooperative control signals having a specific delay and logic relationship, and the timing control circuit module is configured to use a full hardware logic architecture, and comprises three types of elements, i.e., a monostable flip-flop, a logic gate and a D flip-flop.
  4. 4. A high power MEMS switching system based on time sequential collaborative arc suppression according to claim 1 wherein the third switch (3) employs MEMS switching.
  5. 5. A high power MEMS switching system based on time sequential synergistic arc suppression as claimed in claim 1, characterised in that the first switch (9) and the second switch (7) are one of MOSFET switches, fast switches or a combination of MOSFET and IGBT devices.
  6. 6. A method of arc suppression using the system of any one of claims 1-5, the method comprising the steps of: the timing control circuit determines whether a transition occurs in the current signal, When the signal transitions to a high level, the arc suppression steps are as follows: the time sequence control circuit generates Gc signal jump, drives the first switch to be turned from being closed to be opened, and charges the pulse capacitor to a preset voltage; After the capacitor is charged, the time sequence control circuit generates Gmos signal jump to drive the second switch to be opened and closed, the current of the main power supply returns to the cathode of the main power supply through the LC arc extinguishing branch circuit, a low-impedance bypass is established for load current, and the voltage at two ends of the third switch is close to zero; After preset fixed delay, the time sequence control circuit generates Gmems signal jump to drive the third main switch to be closed, the current of the main power supply returns to the cathode through the load and the third switch, at the moment, the load current is shunted through a bypass, the third switch is closed under the condition that the voltage at two ends is close to zero, and the electric arc in the switching-on process is eliminated; When the signal transitions to a low level, the arc suppression steps are as follows: The time sequence control circuit firstly generates Gc signal jump to drive the first switch from closed to open; Then, the time sequence control circuit generates Gmos signal jump to drive the second switch to be opened and closed, the current of the main power supply returns to the cathode of the main power supply through the LC arc extinguishing branch, the LC resonance network is triggered, current pulse is generated to transfer the load current from the third switch, and the voltage at two ends of the third switch is close to zero; after preset fixed time delay, the time sequence control circuit generates Gmems signal jump to drive the third switch to be opened, and the switch contacts are safely separated under the established zero-voltage condition, so that breaking arc is inhibited.
  7. 7. The arc suppression method of claim 6 wherein the timing control circuit generates Gmems signal transitions with a predetermined fixed delay, the fixed delay being calculated based on characteristics of capacitance and inductance.
  8. 8. The arc suppression method of claim 6 or 7, wherein the fixed delay is calculated as: wherein t is fixed delay, L is inductance value of the inductor, and C is capacitance value of the capacitor.
  9. 9. The arc suppression method of claim 8, wherein the preset voltage of the capacitor satisfies the following condition: Wherein V is the preset voltage of the capacitor, I load is the load current, L is the inductance value of the inductor, and C is the capacitance value of the capacitor.
  10. 10. An arc suppression system, characterized in that the system comprises an actuator for performing the arc suppression method as claimed in claims 6-9.

Description

High-power MEMS (micro-electromechanical systems) switching system and method based on time sequence cooperative arc suppression Technical Field The invention belongs to the technical field of micro motors, and particularly relates to a high-power MEMS (micro-electromechanical systems) switching system and method based on time sequence cooperative arc suppression. Background High power circuit switching technology has seen a technological development path from traditional electromechanical relays to solid state relays to microelectromechanical system switches. The traditional electromechanical relay realizes circuit on-off by means of mechanical contacts, and has the inherent defects of large volume, low response speed, easiness in generating electric arcs and the like although the conduction characteristic is good. The solid state relay adopts a semiconductor technology, solves the mechanical abrasion problem, but faces the new challenges of large conduction loss, turn-off leakage current, complex heat dissipation design and the like. Mems switches are considered the next generation technology direction that combines the advantages of the former two. However, when the arc-extinguishing device is applied to a high-voltage and high-current scene, the arc generated in the switching process becomes a core technical bottleneck which limits the reliability and the service life of the arc-extinguishing device. The traditional electromechanical relay has slow response and easy generation of arc, and the solid state relay has the problems of high conduction loss and turn-off leakage current. Existing microelectromechanical switching techniques lack precise active control in arc suppression. Particularly, in the aspect of time sequence control, accurate synchronization of multiple channels cannot be realized, so that current transfer is not thorough, and an arc extinguishing effect is poor. Meanwhile, the existing scheme lacks adaptability to complex working conditions, and cannot dynamically adjust protection parameters according to load characteristics. In addition, some quenching schemes based on passive devices (e.g., balanced diode bridges) are essentially a "passive response" mechanism. The action of the device depends on fault detection, has inherent delay, and more importantly, the circuit principle determines that the device can only provide protection for a breaking process, but is difficult to implement effective arc suppression for a switching-on process, and cannot realize comprehensive protection for a complete switching-on period. The above problems severely limit the application of high power MEMS switches in applications with extremely high reliability requirements (e.g., aerospace, smart grids), highlighting the urgent need for a new system architecture and method that can actively and precisely control the overall switching process and radically suppress arcing. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides a high-power MEMS switching system and a method based on time sequence cooperative arc suppression, which solve the problem of difficult arc suppression of a high-power circuit switch. To achieve the above object, according to one aspect of the present invention, there is provided a high power MEMS switching system based on time-series cooperative arc suppression, the system comprising a load circuit, an arc suppression module, and a time-series control circuit, wherein: the load circuit comprises a main power supply, a load and a third switch, which are connected in series to form a loop; The arc suppression module is used for avoiding the generation of an arc in the third switch, and comprises an LC arc extinguishing branch and a capacitor charging and discharging branch, wherein: The LC arc-extinguishing branch is connected in parallel with two ends of the third switch and is used for establishing and maintaining an approximately zero potential interval far lower than breakdown voltage for two ends of a third switch contact, and the LC arc-extinguishing branch comprises a rectifying circuit, an inductor, a diode, a second switch and a capacitor which are connected in sequence; The capacitor charging and discharging branch circuit provides an initial preset voltage for the capacitor, and comprises an auxiliary power supply and a first switch, wherein the first switch is arranged between the capacitor and the auxiliary power supply; The time sequence control circuit is connected with the first switch, the second switch and the third switch at the same time and is used for judging that the current electric signal jumps to be high level or low level and controlling the opening and closing of the first switch, the second switch and the third switch according to a judging result. The LC arc extinguishing branch circuit is of a single-stage or multi-stage resonant network structure. The time sequence control circuit judges and processe