A kind of output short-circuit protection method of step-up converter
A technology of output short circuit and converter, which is applied in the field of switching power supply, can solve problems such as uncontrollable current, output overcurrent, easy blown fuse, etc., and achieve the effect of increasing the system volume and preventing excessive current
Active Publication Date: 2021-06-04
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] Aiming at the problem that the parasitic diode path between the input and output of the boost converter is always on when the output is over-current, short-circuited or driving a large capacitor, the current cannot be controlled, and the traditional solution needs to add an external fuse device and the output There is a disadvantage that the fuse is easy to blow when there is a large capacitance. The present invention proposes an output short-circuit protection method for a boost converter. An isolation tube is added in the boost converter, and a specific control method for the isolation tube is proposed. Solve the problem that the current cannot be controlled when the output of the boost converter is over-current, short-circuited or driving a large capacitor
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0028] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0029] like image 3 As shown, in the present invention, an isolation tube, namely the second switch tube M2, is set between the freewheeling diode D1 in the conventional boost converter and the output end of the boost converter, and D2 is the parasitic diode of the second switch tube M2. , due to the addition of the second switch tube M2, the reverse-biased diode D2 and the second switch tube M2 are added on the path from the freewheeling diode D1 to the output end, and the path between the input and the output is cut off. The logic control of the second switch tube M2 realizes output overcurrent and short circuit protection by controlling the second switch tube M2, and controls the output voltage V at the same time OUT The rising speed and the control of the output current can realize the soft start of the output v...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
An output short-circuit protection method of a step-up converter, the invention sets a second switching tube with parasitic diode reverse bias between the freewheeling diode and the output end of the step-up converter; by sampling the output of the step-up converter The voltage and the current flowing through the second switch tube are used to determine the over-current and short-circuit conditions and respond accordingly. After the voltage signal at the connection between the freewheeling diode and the second switching tube rises to the threshold voltage, the rising speed of the output voltage of the boost converter is controlled by controlling the rising speed of the first reference voltage connected to the first transimpedance amplifier, Simultaneously sampling the current flowing through the second switching tube and combining the loop control of the second transimpedance amplifier to adjust the output current of the boost converter, combined with hiccup logic to perform overcurrent protection control and the boost converter exits the short circuit state. The invention solves the problem that the current cannot be controlled when the boost converter outputs overcurrent, short circuit or drives a large capacitor, and can be integrated in the chip without increasing the volume of the system.
Description
technical field [0001] The invention belongs to the technical field of switching power supplies, and relates to overcurrent protection, large-capacitance driving and soft-start technology of a boost converter (BOOST converter). Background technique [0002] Due to the structural characteristics of the boost converter, there will always be a parasitic diode path between the input and the output. When the output is overcurrent, short-circuited, or drives a large capacitor, the diode will always be in a conducting state, resulting in an uncontrollable current. Permanent damage to the chip. [0003] like figure 1 As shown, the boost converter includes an inductor L, a first switch M0 and a freewheeling diode D1. One end of the inductor L is connected to the input end of the boost converter, and the other end is connected to the boost converter through the freewheel diode D1. The first switch tube M0 is connected between the connection point of the inductor L and the freewheeli...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M3/158H02M1/08H02H7/12
CPCH02H7/1213H02M1/08H02M1/32H02M3/158
Inventor 王磊
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD