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A short-circuit determination and timing control method and circuit

A control method and voltage technology, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc., can solve the problems of long timing time and difficulty in choosing timing time, so as to improve capacity, save area and cost, and control temperature. The effect of rising

Active Publication Date: 2021-06-11
SHENZHEN NANYUN MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above formula that in order to take into account the capacitive load, the timing time Td usually needs to be set longer, and the longer timing time is contradictory to the problem of short-circuit heating, and it is often difficult to select the timing time for this problem during design. middle

Method used

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  • A short-circuit determination and timing control method and circuit
  • A short-circuit determination and timing control method and circuit
  • A short-circuit determination and timing control method and circuit

Examples

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no. 1 example

[0056] image 3 It is a schematic diagram of the detection and transmission module and the comparison module of the first embodiment of the present invention, Figure 4 It is a schematic diagram of the logic control and drive module of the first embodiment of the present invention.

[0057] The detection and transmission module consists of transmission gate 1 and transmission gate 2. The input terminal of the transmission gate 1 inputs the drain voltage drop VD1 of the power transistor 1, the control terminal inputs the gate drive signal Ton1 of the power transistor 1, and the output terminal is connected to the first input terminal VDon of the comparison module; the input terminal of the transmission gate 2 inputs the power The drain voltage drop VD2 of the tube two, the gate drive signal Ton2 of the power tube two is input to the control terminal, and the output terminal is connected to the first input terminal VDon of the comparison module.

[0058] The comparison module ...

no. 2 example

[0088] In the second embodiment, the overall judgment structure and mode are the same as in the first embodiment, the difference is that in the second embodiment, an over-temperature protection function is added, and the over-temperature protection signal OTP_L is connected with the short circuit and overcurrent combined with judgment, changes in the logic control module, such as Figure 5 .

[0089] The logic control and drive module of this embodiment is composed of transmission gate 7, transmission gate 8, transmission gate 9, transmission gate 10, transmission gate 11, transmission gate 12, two-input AND gate AND4, four-input AND gate AND5. The input terminal of the transmission gate 7 inputs the short-circuit timing signal Td_osp, the control terminal is connected to the output terminal of the short-circuit determination comparator CMP1, and the output terminal is connected to the rest timing module. The input terminal of the transmission gate 8 is input with the overcur...

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Abstract

The invention discloses a short-circuit judgment and timing control method and circuit. The short-circuit judgment and timing control method of the application is to design and control the timing strategy by distinguishing short-circuit, startup overcurrent and steady-state overcurrent judgment, and realize push-pull or The short-circuit temperature rise control of the full-bridge converter and the capacitive load capacity are taken into account, that is, the short-circuit time is short and the temperature rise is small; the time is extended under the over-current state caused by a large capacitive load to ensure a high capacitive load. load capacity. Correspondingly, the short circuit determination and timing control circuit of the present invention includes a detection and transmission module, a comparison module, a logic control and driving module, and a rest timing module.

Description

technical field [0001] The invention relates to a switching converter, in particular to short-circuit and over-current judgment and corresponding timing control in full-bridge and push-pull converters. Background technique [0002] Constant voltage power modules often use full-bridge converters and push-pull converter topologies, which have the advantages of simple structure, high efficiency, and small size, and are widely used. However, the disadvantage of most existing constant voltage power supply modules is that they have no protection function. For example, in a short circuit, a large current will flow through the power tube, which is easy to damage the switching device. Based on this, the constant voltage power supply module gradually tends to be integrated, that is, the work of the constant voltage module is controlled by the driver IC, such as figure 1 , and can integrate short-circuit protection function and over-temperature protection function in the driver IC to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M1/36H02M3/337
CPCH02M1/32H02M1/36H02M3/337H02M1/0009
Inventor 周阿铖陈树澍
Owner SHENZHEN NANYUN MICROELECTRONICS CO LTD