Overvoltage protection circuit
An overvoltage protection circuit and circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as power supply voltage overshoot, large current generated by the circuit, irreversible damage to the circuit, etc., to reduce power consumption, Achieve overvoltage protection function and save design complexity
Inactive Publication Date: 2017-10-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0003] There are some random influencing factors in the environment where the circuit is located, which leads to overshoot of the power supply voltage
When the power supply voltage is too large, if no measures are taken to stop the circuit, a large current may be generated in the circuit.
This may cause irreversible damage to the circuit
Method used
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[0014] Below with reference to the accompanying drawings, the best embodiment of the present invention is given, and a detailed description is given.
[0015] image 3 Shown is the core module of the overvoltage protection circuit of the present invention, including: a voltage divider module, an undervoltage and overvoltage detection module, a buffer and a logic processing module.
[0016] On the one hand, the detection voltage provides a proportional input for the overvoltage detection module through voltage division, and on the other hand, the detection voltage is used as the power supply voltage of the overvoltage detection module. The input signal is divided by the NJFET device and the circuit in series with two diode-connected PMOS transistors, and then input from the source of the NJFET to the gate of the NMOS transistor 2. When the voltage of the 1A node is relatively small, the PMOS transistors 8 and 9 do not work, so the NJFET is equivalent to a wire, and its own imp...
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The invention belongs to the field of analog integrated circuit, and specifically provides a simple overvoltage protection circuit. The circuit comprises a pressure division module, an overvoltage detection module, a buffer and a logic signal processing module. The pressure division module samples detection voltage, and inputs the sampled detection voltage to the overvoltage detection module. The core component of the circuit, the overvoltage detection module is simple in circuit and fast in reaction speed, so that a well overvoltage detection function can be achieved by using very small layout area. Furthermore, the overvoltage detection module uses NJFET at the input port, so that V1 voltage is clamped when in overvoltage, and thus large power consumption in case of overvoltage is avoided. The buffer is composed of two phase inverters connected in series. Therefore, logic signals output by the overvoltage module are more stable. The logic signal processing module allows the circuit to stop working so as to protect the circuit according to the logic signal when in overvoltage.
Description
technical field [0001] The invention belongs to the technical field of analog integrated circuits, in particular to an overvoltage protection circuit. Background technique [0002] In today's integrated circuit technology, any complete circuit system requires a complete circuit protection system, and the more common one is the overvoltage protection circuit. This patent proposes a relatively simple circuit structure for the overvoltage protection circuit. [0003] There are some random influencing factors in the environment where the circuit is located, which leads to overshoot of the power supply voltage. And when the power supply voltage is too large, if no measures are taken to stop the circuit, a large current may be generated in the circuit. This may cause irreversible damage to the circuit. Therefore, a detection circuit is needed in the circuit to detect the occurrence of an overvoltage condition. When overvoltage occurs, the circuit stops working, thereby protect...
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Login to View More IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 李可
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA