A gate drive circuit overcurrent protection system
A gate drive circuit and overcurrent protection technology, which is applied in the field of gate drive circuit overcurrent protection system, can solve problems such as output current exceeding the set value and damage the circuit, and achieve the effect of reducing switching frequency and avoiding damage
Active Publication Date: 2022-02-15
58TH RES INST OF CETC
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Problems solved by technology
[0004] The purpose of the present invention is to provide a gate drive circuit overcurrent protection system to solve the current problem that the output current exceeds the set value due to abnormal working conditions, thereby damaging the circuit
Method used
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Embodiment 1
[0027] The present invention provides an overcurrent protection system for a gate drive circuit, including an output power tube control logic circuit and an OCP_FLAG control logic circuit. The working process of the gate drive circuit overcurrent protection system is as follows: figure 1 shown. When over-current occurs for the first time, first confirm whether the over-current time is greater than 3μs. If the time does not meet the requirements, the power tube will remain on, OCP_FLAG will remain high, and the over-current protection will not operate;
[0028] If the over-current time is greater than 3μs, OCP_FLAG will become low, which means that the system has over-current; at the same time, 300μs Counter will start counting after being cleared, and OCP_FLAG will remain low during this process. If the system overcurrent occurs again when the 300μs Counter is not fully counted, the 300μs Counter will be reset to zero and start counting again, and OCP_FLAG will remain low duri...
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The invention discloses an overcurrent protection system for a gate drive circuit, which belongs to the technical field of power supply management and includes an output power tube control logic circuit. When the single overcurrent state of the system meets the set conditions, the subsequent drive logic is closed; OCP_FLAG control logic The circuit, when an overcurrent occurs in the system, indicates to the subsequent circuit whether the system is overcurrent through the logic high or low of OCP_FLAG. The protection system of the present invention requires a delay of 3 μs to confirm that the system has completely entered the over-current state, so as to avoid false triggering of the over-current protection due to switch switching or peripheral disturbances affecting the normal operation of the circuit; each time the over-current is confirmed, the system will be forced to shut down for 30 μs , and then the over-current protection logic is shielded for 3μs, and the system resumes working. Reduce the switching frequency of the system after over-current, to avoid damage to the system due to frequent switching after over-current; the control logic of the over-current flag bit OCP_FLAG and the control logic of the output power tube are independent of each other, and can be used without affecting the normal operation of the circuit. Indicates whether the output current of the circuit is abnormal.
Description
technical field [0001] The invention relates to the technical field of power management, in particular to an overcurrent protection system for a gate drive circuit. Background technique [0002] With the advancement of IC design, power MOS devices, as voltage-controlled rather than current-driven devices, are widely used in various communication and mobile electronic devices because of their excellent frequency switching characteristics. However, limited by device characteristics, power MOS cannot withstand excessive current for a long time. If the chip cannot deal with the situation in which the output current exceeds the set value due to abnormal working conditions in time, energy accumulation will occur in the power MOS, causing damage to the gate driver chip itself and subsequent circuits, and eventually the overall system will collapse. [0003] Therefore, it is necessary to design a circuit that can effectively monitor the excessive output current and take correspondi...
Claims
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IPC IPC(8): H03K19/003H03K19/20
CPCH03K19/00369H03K19/20
Inventor 奚冬杰罗永波宣志斌
Owner 58TH RES INST OF CETC