Dead zone generation circuit of driver of variable pitch control system
A generation circuit and control system technology, applied in wind power generation, control of wind turbines, emergency protection circuit devices, etc., can solve the problems of inconvenient change, difficult to control dead time, etc., achieve simple structure, easy dead time, prevent straight-through effect
Active Publication Date: 2011-10-26
埃斯倍风电科技(青岛)有限公司
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Problems solved by technology
The currently used hardware circuits are generally composed of gate circuits and peripheral devices, and the dead time is determined by the discharge of resistors and capacitors. However, the dead time of such hardware circuits is difficult to control and inconvenient to change
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Embodiment Construction
[0015] figure 1 It is a functional block diagram of the pitch control system driver dead zone generating circuit of the present invention. The first input signal (usually a pulse width modulation signal) is respectively connected to the first input end of the first shift register and the second input end of the second shift register, and the first input signal is respectively connected to the first shift register through a NOT gate. The second input end of the bit register and the first input end of the second shift register, the outputs of the first shift register and the second shift register are respectively connected to the first input end of the first NAND gate and the second NAND gate , the second input signal is respectively connected to the second input terminals of the first NAND gate and the second NAND gate. After being processed by the first shift register and the second shifter, the PWM signal becomes a complementary control signal with time-adjustable dead zone;...
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The invention provides a dead zone generation circuit of a driver of a variable pitch control system, wherein the dead zone generation circuit comprises a first displacement register, a second displacement register, a NOT gate, a first NOT gate and a second NOT gate. The first displacement register and the second displacement register are used for receiving a first input signal, the NOT gate is connected with the first input signal, and the fist NOT gate and the second NOT gate are used for receiving a second input signal. The invention has the advantages that the dead zone generation circuithas simple structure, the dead zone time is easy to control and convenient to regulate, and the circuit is turned off from outputting under a shut down condition or abnormal conditions so as to form multiple protection for driving signals. In occasions with higher requirements on the reliability of the driver of the variable pitch control system, the dead zone generation circuit of the invention can effectively prevent the direction connection of the upper and lower switching tubes of a bridge arm of the driver so as to improve the reliability of the driver.
Description
technical field [0001] The invention belongs to the field of motor control, in particular to a dead zone generating circuit for a DC motor driver of a pitch control system. Background technique [0002] The pitch control system is an important component in the wind power generation system, and the motor driver is one of the key components of the pitch control system. The effective shoot-through protection of the drive is an important factor to ensure the stable and reliable operation of the drive. In order to prevent the driver from being burned by the simultaneous conduction of the upper and lower switching tubes of the driver bridge arm, it is necessary to add a dead time to the complementary driving signals of the upper and lower switching tubes of the same bridge arm to ensure that the other switching tube can be turned on after a certain period of time after one switching tube is turned off. Pass. [0003] In order to improve the reliability and prevent the dead time ...
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IPC IPC(8): F03D7/00H02H7/08
CPCY02E10/72
Inventor 肖庆恩傅建民林盈杰邓杰尤林森
Owner 埃斯倍风电科技(青岛)有限公司