Overvoltage protection circuit, overvoltage protection method and motor controller
A technology of overvoltage protection circuit and motor controller, which is applied in the direction of motor control, control system, electrical components, etc., can solve the problem that the high voltage safety of high voltage components cannot be effectively guaranteed, and achieve the effect of fast hardware overvoltage protection
Pending Publication Date: 2021-12-07
SUZHOU INOSA UNITED POWER SYST CO LTD
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Problems solved by technology
[0005] The main purpose of the present invention is to provide an overvoltage protection circuit, an overvoltage protection method and a motor controller, aiming to solve the technical problem that the prior art cannot effectively guarantee the high voltage safety of the internal high voltage components of the drive motor controller
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[0046] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0047] An embodiment of the present invention provides an overvoltage protection circuit, referring to figure 1 , figure 1 It is a structural schematic diagram of the first embodiment of the overvoltage protection circuit of the present invention.
[0048] The overvoltage protection circuit includes a voltage sampling circuit 100 , an overvoltage comparison circuit 200 , a signal processing circuit 300 and a drive execution circuit 400 connected in sequence.
[0049] It should be noted that the voltage sampling terminal of the voltage sampling circuit 100 is connected to the high-voltage electrode terminal of the DC bus, the voltage sampling signal output terminal of the voltage sampling circuit 100 is connected to the voltage sampling signal input terminal of the overvoltage comparison circuit 200, and the overvolta...
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The invention discloses an overvoltage protection circuit, an overvoltage protection method and a motor controller, and belongs to the technical field of high voltage. The overvoltage protection circuit comprises a voltage sampling circuit, an overvoltage comparison circuit, a signal processing circuit and a driving execution circuit which are connected in sequence, the voltage sampling circuit carries out voltage sampling on a direct current bus to generate a voltage sampling signal, and the overvoltage comparison circuit carries out voltage comparison on the voltage sampling signal and a first reference voltage; when the sampling voltage of the voltage sampling signal is larger than or equal to the first reference voltage, an overvoltage signal is generated, the signal processing circuit carries out signal processing according to the overvoltage signal and generates an enable signal and an active short-circuit signal, and the driving execution circuit controls the motor controller to enter a safe state according to the enable signal and the active short-circuit signal. According to the invention, voltage sampling is carried out on the DC bus, when the sampling voltage of the voltage sampling signal exceeds the first reference voltage, the driving motor control system is controlled to enter a safe state, and rapid hardware overvoltage protection is realized.
Description
technical field [0001] The invention relates to the field of high voltage technology, in particular to an overvoltage protection circuit, an overvoltage protection method and a motor controller. Background technique [0002] When the vehicle is running at high speed and the main contactor of the battery is disconnected abnormally, the voltage at both ends of the DC bus capacitor connected to the drive motor controller will be overvoltage due to the impact of the back electromotive force of the permanent magnet synchronous motor. The phenomenon will be aggravated with the increase of the back EMF of the motor and the increase of the power generation. When the overvoltage occurs, it is necessary to adopt overvoltage protection to avoid equipment damage or safety accidents. [0003] At present, the driving motor controller usually needs to switch from the normal operation mode to the safe mode within tens of microseconds to hundreds of microseconds, and the operating time of th...
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IPC IPC(8): H02P29/024
CPCH02P29/0241
Inventor 秦秀敬
Owner SUZHOU INOSA UNITED POWER SYST CO LTD