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Non-isolated switch converter output open circuit protection device and method

A switching converter, non-isolated technology, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, circuit device, etc., can solve the problems of complex signal level conversion circuit and high cost

Active Publication Date: 2014-08-06
魏其萃
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to withstand the input voltage and resist various common-mode interferences, this makes the signal level conversion circuit (B) complex and expensive

Method used

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  • Non-isolated switch converter output open circuit protection device and method
  • Non-isolated switch converter output open circuit protection device and method
  • Non-isolated switch converter output open circuit protection device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1. A non-isolated switching converter output open circuit protection device in continuous current mode,

[0046] The main power switch drive signal D is connected to the control terminal of the multi-way switch K, and the multi-way switch K controls when to charge and discharge the capacitor C; the output of the multi-way switch K enters the ground through the capacitor C; the capacitor C The voltage at both ends is sent to the input terminal (ie, input + terminal and input - terminal) of the sample and hold comparator (S / H+C); the charging current source I CHA and discharge current source I DIS respectively connected to the two input ends of the multi-way switch K;

[0047] The output terminal of the sample-and-hold comparator (S / H+C) outputs an "OPEN" signal, and the output terminal of the sample-hold comparator (S / H+C) is also connected to an input terminal of the AND gate; the main power switch drive signal D is connected to the other input terminal of ...

Embodiment 2

[0060] Embodiment 2. An output open-circuit protection device for non-isolated switching converters in discontinuous and critical discontinuous current operating modes;

[0061] Discontinuous and critical discontinuous current mode non-isolated switching converter output open circuit protection method (such as Figure 7 shown) and the specific output open-circuit protection circuit of the continuous current operation mode non-isolated switching converter output open-circuit protection method in the realization of the difference is: image 3 The start signal FS that starts the sample-and-hold comparator (S / H+C) in Figure 7 The output signal ZCD at the moment when the inductor current crosses zero will be changed.

[0062] That is, the start signal of the sample-and-hold comparator (S / H+C) is the output signal ZCD when the inductor current crosses zero.

[0063] Discontinuous and critical discontinuous current working mode The non-isolated switching converter output open circ...

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PUM

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Abstract

The invention discloses a non-isolated switch converter output open circuit protection device. Main power switch drive signals D are connected with the control end of a multi-path switch K. Time of charging and discharging a capacitor C is controlled by the multi-path switch K. The voltage across the two ends of the capacitor C is supplied to the input end of a sampling retaining comparator (S / H+C). The output end of the sampling retaining comparator (S / H+C) outputs OPEN signals. A starting signal of the sampling retaining comparator (S / H+C) is either a clock high-level signal FS corresponding to each main power switch drive signal D or an output signal ZCD at the moment when the current of an inductor L exceeds zero. The invention further provides a non-isolated switch converter output open circuit protection method in a continuous current work mode and a non-isolated switch converter output open circuit protection method in an intermittent current work mode and a critically-intermittent current work mode.

Description

technical field [0001] The invention relates to a non-isolated switch converter output open circuit protection device and method. Background technique [0002] Non-isolated switching converters such as buck, buck-boost and boost switching converters are widely used due to their simplicity and high efficiency. Such as figure 1 As shown, since the main switch control circuit of the non-isolated switching converter and the output of the non-isolated switching converter usually have a level difference equivalent to the input voltage, this makes the output open circuit protection of the non-isolated switching converter complex and expensive. Usually, the output open-circuit protection circuit of the non-isolated switching converter is composed of an output open-circuit detection circuit (A) and a signal level conversion circuit (B). The output open circuit detection circuit (A) is to give the information of when the non-isolated switching converter outputs an open circuit; the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/10H02H3/06
Inventor 翁大丰魏其萃
Owner 魏其萃