High-efficiency intelligent high-side electronic load switch with wide voltage adaptability

Abstract

A high-efficiency intelligent high-side electronic load switch with wide voltage adaptability comprises a power supply module, a core control module, a self-boosting module, a voltage detection module, a current detection module and a switching module. The core control module is used for signal acquisition, information processing and storage and logic control; firstly, the core control module receives an external switch control input signal and detection signals output by the current detection module and the voltage detection module and processes and analyzes monitoring data according to an internally stored program to control the switching module to complete corresponding actions; secondly, the core control module provides a PWM control signal for the self-boosting module. The voltage detection module and the current detection module are used for detecting the real-time operating voltage and current of the switching module and transmitting data to the core control module for processing and analysis. The self-boosting module is used for providing a driving voltage for a switching tube in the switching module. The switching module is used for executing the on-off actions of a load. The high-efficiency intelligent high-side electronic load switch is wide in operating voltage range, high in operating frequency, high in efficiency, low in loss, safe, reliable and programmable.

Description

technical field [0001] The invention relates to an electronic load switch, in particular to a high-efficiency intelligent high-side electronic load switch with wide voltage adaptability. Background technique [0002] Compared with mechanical switches, electronic load switches that use semiconductor technology to achieve on-off have the advantages of small size, low loss, fast action speed, reliable on-off, long effective life, and PWM output. Indispensable module for a wide range of applications. [0003] Although the electronic load switch has many advantages in application, its main component, the switching tube, has high requirements on the driving conditions, especially sensitive to the working voltage. Under different working voltages, the performance of the switching tube will change greatly, resulting in drop or even fail to work normally or burn out due to heat; in order to deal with this problem, general electronic load switch products will strictly limit their wor...

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Problems solved by technology

[0003] Although the electronic load switch has many advantages in application, its main component, the switching tube, has high requirements on the driving conditions, especially sensitive to the working voltage. Under different working voltages, the performance of the switching tube will change greatly, resulting in drop or even fail to work normally or burn out due to heat; in order to deal with this problem, general electronic load switch products will strictly limit their working voltage range, and products of different working voltage ranges are not allowed to be used in common; with the development of electronic and electrical products, functionally Electronic load switches that can only be turned on and off by passive control are difficult to meet the needs of high-reliability products. Electronic load switches with intelligent functions such as autonomous monitoring and load safety protection are the direction of future development.

[0004] The load switch can be divided into high side and low side according to the position of the switch. The high side means that the switch is located between the positive pole of the power supply and the positive pole of the load; the low side means that the switch is located between the negative pole of the load and the negative pole of the power supply. In terms of performance, the high-side switch is superior to the low-side switch in terms of safety and durability, because the load side is not charged after the high-side switch is turned off, and various measures to protect the switch tube are also easy to implement; but from a design point of view, Under the premise of achieving the same performance, high-side switches are more difficult than lower-side switches; currently, low-side switches on the market generally use N-channel MOS transistors as switching tubes, which have a simple structure, high switching speed and high efficiency; high-side switches generally have many The P-channel MOS tube is used as the switch tube, although the structure is simple, but because the P-channel MOS tube is used, its switching speed and efficiency are much worse than that of the N-channel MOS tube, and the heat is large, so it is difficult to apply to high frequency or In high-current applications, if N-channel MOS tubes are used instead, it is necessary to solve the problem that the drive voltage of the switch tube is higher than the load voltage

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