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Limited bipolar circuit and method

A bipolar and circuit technology, applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as unproposed solutions, and achieve a wide range of applications

Inactive Publication Date: 2020-06-16
邢台子中电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] How to use limited analog devices to design a drive circuit for a limited bipolar soft switching circuit whose frequency can be adjusted freely has not yet proposed an effective solution

Method used

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  • Limited bipolar circuit and method

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Embodiment Construction

[0022] In order to further illustrate this embodiment, the present invention is provided with accompanying drawings. These drawings are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments, and can cooperate with the relevant descriptions in the specification to explain the operating principles of the embodiments, with reference to Those of ordinary skill in the art should be able to understand other possible implementation manners and advantages of the present invention from these contents. The components in the figure are not drawn to scale, and similar component symbols are usually used to indicate similar components.

[0023] According to an embodiment of the present invention, a limited bipolar driving circuit whose frequency can be adjusted freely is provided. Such as image 3 As shown, in one embodiment, the initial drive signal of the circuit comes from a conventional hard switch drive chip SG3525. The 11th and 14th pins of t...

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Abstract

The invention discloses a limited bipolar circuit and method, and belongs to the technical field of power electronics. A PWM device SG3525, a phase inverter, an NAND gate and a double-D trigger are utilized to output a limited bipolar soft switching circuit driving signal with adjustable frequency, wherein the SG3525 generates a driving pulse width with an adjustable width; meanwhile, the pulse signal is utilized and combined with a pulse signal of a fourth pin of the SG3525, and finally, a driving signal with a fixed pulse width is output by the double-D trigger through level conversion and logic operation of the inverter and the NAND gate; and the equivalent resistance to the ground of the sixth pin of the SG3525 is indirectly controlled through an external level, so that the frequency of the driving pulse can be changed. The control method can be applied to any soft switching circuit needing to use a limited bipolar control mode, so that the application field is extremely wide.

Description

Technical field [0001] The present invention relates to the field of power electronics, and in particular to a limited bipolar circuit and method. Background technique [0002] In a switching power supply using a full-bridge circuit as the main circuit, the soft switching control mode is superior to the hard switching control mode in many technical indicators such as improving work efficiency, reducing electromagnetic interference, reducing switching device losses, and extending the life of switching devices. Therefore, More and more high-power switching power supplies generally adopt the full-bridge circuit soft switching control mode. We know that in the full-bridge soft-switching circuit, there are two control modes: full-bridge phase shifting and limited bipolarity. The full digital control mode is adopted. Both DSP or high-speed MCU can realize these two control modes, but this method Compared with the high cost of the analog control method, the technical requirements are h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M1/088
CPCH02M1/083H02M1/088
Inventor 王德斌王康
Owner 邢台子中电子科技有限公司
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