Driving method and device for IGBT provided with push-and-pull isolating power source

A technology for isolating power supplies and driving devices, which is applied in the direction of output power conversion devices, electrical components, and adjusting electrical variables, etc. It can solve problems such as difficult control of distributed capacitance, high cost of driving devices, and complicated secondary windings of isolated power transformers.

CN105871218AInactive Publication Date: 2016-08-17LUOYANG CITIC HIC AUTOMATION ENG
3 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-08-17
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to the technical field of IGBT driving and provides a driving method and device for an IGBT provided with a push-and-pull isolating power source. The driving device adopted in the method comprises a primary side driving circuit, a secondary side driving circuit and a push-and-pull DCDC isolating power source circuit; a PWM shaping circuit of the primary side driving circuit is connected with the input end of the secondary side driving circuit through a photoelectric isolating circuit; the feedback end of the secondary side driving circuit is connected with a fault signal latch circuit of the primary side driving circuit through a fault feedback circuit; the output end of the secondary side driving circuit is connected with an IGBT module; the input end of the PWM shaping circuit, the output end of the fault signal latch circuit and the push-and-pull isolating power source circuit are connected with a driver interface. By controlling primary and secondary distributed capacitance of a transformer, the common-mode rejection capacity of the driving device is improved, and the anti-jamming capability of the driving device is enhanced; the isolating power source circuit is simplified, and the cost of the driving device is lowered; the size of the driving device is reduced, and the driving device is high in practicability and reliability.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of IGBT driving, in particular to an IGBT driving method and device configured with a push-pull isolated power supply, which is suitable for compact and low-cost IGBT driving occasions. Background technique

[0002] In IGBT applications, the IGBT drive device not only plays an important role in the reliability of the entire system, but also has an important impact on the miniaturization and low cost of the entire system. Because the drive circuit using the dedicated IC with photoelectric isolation technology as the core device has the characteristics of flexible design, small size, high stability and reliability, it is widely used in IGBT applications that require high system volume and cost. The drive circuit using a special IC for photoelectric isolation technology generally needs to be configured with an isolated power supply outputting a positive and negative common ground voltage to form a complete set ...

Examples

Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] combined with Figure 5 , 6 As shown, an IGBT drive device configured with a push-pull isolated power supply includes: a primary side drive circuit, a secondary side drive circuit, a push-pull DCDC isolated power supply circuit, and the PWM shaping circuit of the primary side drive circuit communicates with the secondary side through the photoelectric isolation circuit. The input terminal of the side drive circuit is connected, the feedback terminal of the secondary side drive circuit is connected with the fault signal latch circuit of the primary side drive circuit through the fault feedback circuit, the output terminal of the secondary side drive circuit is connected with the IGBT module; the PWM shaping circuit input of the primary side drive circuit The terminal, the output terminal of the fault signal latch circuit, and the push-pull DCDC isolate...