A motor brake circuit for thyristor drive
A circuit and brake control technology, applied in the direction of DC motor deceleration device, electric motor/converter plug, etc., can solve problems such as no explanation or report found, uncontrollable shutdown, short circuit between brake device and thyristor, etc., to achieve The effect of preventing the short circuit of the brake device
Active Publication Date: 2018-05-18
SHANGHAI GREATWAY WELDING EQUIP
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AI Technical Summary
Problems solved by technology
The thyristor can be triggered by the gate, but it cannot be turned off, which often leads to the following problems during the braking process of the motor: the brake circuit operates while the thyristor is not turned off, which leads to a short circuit between the braking device and the thyristor
[0005]
At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.
Method used
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Embodiment
[0028] like figure 1 As shown, this embodiment provides a motor brake circuit for thyristor drive, including: zero-crossing synchronous circuit, brake control circuit, brake self-locking circuit and brake circuit; wherein:
[0029] The zero-crossing synchronization circuit is used to generate a synchronization signal for grid voltage zero-crossing;
[0030] The brake control circuit is used to start the brake circuit after the synchronous thyristor is turned off due to the grid voltage crossing zero;
[0031] The brake self-locking circuit is used to lock and maintain the braking state after the brake circuit is activated, so as to achieve maximum braking efficiency;
[0032] The braking circuit is used to short-circuit both ends of the motor to achieve braking.
[0033] Further, the zero-crossing synchronization circuit includes a diode V24, a capacitor C66, a resistor R158, and a resistor R159; wherein, the diode V24, the resistor R159, and the capacitor C66 are connected ...
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The invention provides a motor brake circuit used for controllable silicon drive. The motor brake circuit comprises a zero-crossing synchronization circuit, a brake control circuit, a brake self-locking circuit and a brake circuit, wherein the zero-crossing synchronization circuit is used for generating a synchronization signal that network voltage is zero-crossing; the brake control circuit is used for synchronizing controllable silicon to start the brake circuit after being turn-off due to the fact that the network voltage is zero-crossing; the brake self-locking circuit is used for locking and maintaining a braking state after the brake circuit is started so as to realize the maximum braking efficiency; and the brake circuit is used for realizing braking at two ends of a short-circuited motor. The motor brake circuit effectively prevents a short circuit of controllable silicon and a brake device, and the brake circuit with the shortest active braking time is implemented; the brake circuit is synchronized by using natural turn-off of the controllable silicon at the power supply moment of zero, and the maximum braking efficiency is reached once the brake self-locking circuit is synchronized; and the motor brake circuit allows brake revocation at any time to drive the motor.
Description
technical field [0001] The invention relates to the technical field of motor brakes, in particular to a motor brake circuit driven by silicon controlled rectifiers. Background technique [0002] SCR is a high-power semiconductor device with a four-layer structure of three PN junctions, also known as a thyristor. It has the characteristics of small size, relatively simple structure, and strong functions. It is one of the more commonly used semiconductor devices. The device is widely used in various electronic equipment and electronic products, and is mostly used for controllable rectification, inverter, frequency conversion, voltage regulation, non-contact switch, etc. Dimming lamps, speed-adjusting fans, air conditioners, televisions, refrigerators, washing machines, cameras, combined audio systems, sound and light circuits, timing controllers, toy devices, radio remote controls, cameras and industrial controls in household appliances are widely used A thyristor device. ...
Claims
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IPC IPC(8): H02P3/08
CPCH02P3/08
Inventor 肖满满沈东杰徐德进陈绪强
Owner SHANGHAI GREATWAY WELDING EQUIP