A circuit for realizing multi-stage output current limiting according to instruction hardware
A technology of hardware implementation and current limiting circuit, applied in the direction of emergency protection circuit device, circuit device, emergency protection circuit device for limiting overcurrent/overvoltage, etc., can solve the problem of slow system braking response, long braking distance, Affect the braking effect and other problems, to achieve the effect of fast braking response and short execution cycle time
Pending Publication Date: 2018-12-21
NANJING ZHIZHUO ELECTRONICS TECH
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Problems solved by technology
However, from signal input, circuit conversion, embedded system software processing, and finally execution of instructions, the cycle time is long, the system braking response is slow, and the braking distance required by the vehicle is long, which affects the braking effect and reduces safety. This is very fatal in the operation of maglev vehicles
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Embodiment Construction
[0017] like figure 1 Shown:
[0018] The present invention mainly includes an optocoupler isolation conversion circuit 1 , a decoder circuit 2 , a target current reference voltage setting circuit 3 , and a voltage comparison / adjustment circuit 4 . The optocoupler isolation conversion circuit 1 is connected to the decoder circuit 2; the decoder circuit 2 is connected to the target current reference voltage setting circuit 3; the target current reference voltage setting circuit 3 is connected to the voltage comparison / adjustment circuit 4.
[0019] Optocoupler isolation conversion circuit 1 is to connect the signal sig1 to the cathode of the voltage regulator tube Z1 through the resistor R1, and then one way passes through the cathode of the voltage regulator tube Z1 to the anode, and then connects to Vin-; the other way is connected to the resistor R2 through the cathode of the voltage regulator tube Z1 One end of the resistor R2, the other end of the resistor R2 is connected ...
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The invention relates to a circuit for realizing multi-stage output current limiting according to instruction hardware. The structure of the invention is that the optical coupling isolation conversioncircuit is connected with a decoder circuit, the decoder circuit is connected with a target current reference voltage setting circuit, and the target current reference voltage setting circuit is connected with a voltage comparison / regulation circuit. The invention overcomes the defects of long cycle time, slow braking response of the system, long braking distance required by the vehicle, influence on braking effect and reduction of safety caused by the vehicle-mounted safety computer transmitting multiple sets of hard-wire control commands through the vehicle-mounted control distributor. An optocoupler isolation circuit is used to delivery to decoder chip, converts the current in the brake system output circuit to an induced current signal, Compared with the target current reference voltage, the output logic level, the pulse width, the execution cycle time, the braking response and the current limiting can be achieved by adjusting the device parameters. The embedded system such as single chip microcomputer and DSP can be used to adapt to different circuits.
Description
technical field [0001] The invention relates to the field of power supply output current limiting control, in particular to a multi-stage output current limiting circuit realized by instruction hardware. Background technique [0002] Compared with traditional wheel-rail high-speed trains, maglev trains have the advantages of good riding comfort, safety, high speed, high efficiency, and no noise pollution. The high-speed transportation system is also a development direction of the future high-speed railway. Due to the fast running speed of the maglev train, its safety braking problem is more complicated and important than that of ordinary trains. The ultra-high running speed of the high-speed maglev train puts forward higher requirements for its braking. When the high-speed maglev transportation system encounters a fault during operation, the traction force of the train should be cut off immediately, and the maglev train should be braked immediately. The main function of th...
Claims
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Login to View More IPC IPC(8): H02H9/02
CPCH02H9/025
Inventor 陆伟伟张步平咸国斌李齐龙
Owner NANJING ZHIZHUO ELECTRONICS TECH