Fail to safe relay and driving method thereof
A fail-safe, driving method technology, applied in electrical components, electronic switches, pulse technology, etc., can solve problems such as inability to guarantee normal operation, hidden dangers, etc., to enhance fail-safe characteristics, ensure state knowability, and increase coil drive voltage. Effect
Inactive Publication Date: 2012-03-21
BEIJING UNION UNIVERSITY
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Problems solved by technology
In this patent application, a positive feedback loop is introduced to separate the conduction voltage and cut-off voltage of the relay with a certain margin. The relay has hysteresis characteristics to prevent critical jitter, and the relay output is not affected by the load. The ports are relatively independent, but the relay in this patent application cannot guarantee that it can still work normally when any component fails, so there is a potential safety hazard
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[0021] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.
[0022] Such as figure 1 as shown, figure 1 It is a circuit diagram of a preferred embodiment of the fail-safe relay of the present invention. From figure 1 It can be seen from the figure that the fail-safe relay 10 includes photocouplers M1 and M2 , inductor L1 , field effect transistor G1 , diodes D1 and D2 , capacitor C1 and a coil contact combination 101 . The drive of the fail-safe relay 10 requires a square wave signal with a specific period. The square wave signal is a periodic square wave signal with an adjustable duty ratio provided by the relay drive terminal S2 by the external relay drive unit 20. The square wave signal The power supply is provided by U1, and the power supply U1 is provided by the relay driving unit 20, and the relay...
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The invention provides a fail to safe relay and a driving method thereof, wherein the fail to safe relay is supplied with periodicity square signals by an external relay driving terminal, the relay driving terminal is coupled with a first photoelectric coupler, and an output terminal of the first photoelectric coupler is connected with a field-effect tube, a first diode, a second diode, a capacitor and a coil touch point in sequence. The fail to safe relay provided by the invention solves the problems that the relay in the prior art is not self provided with a failure safe control circuit andthe failure safe characteristics are realized by requiring a driving circuit of external dynamic switching value signals, and simultaneously is designed with energy exchanging, boosting and driving functions of an inductance capacitor, so as to ensure that the relay can be disconnected when any component has faults, therefore, the relay can be ensured to meet the fault lead safety principle.
Description
technical field [0001] The invention relates to the field of switching value output control, in particular to a fail-safe relay. Background technique [0002] The relay is the most commonly used switching value control device. It has a control system (also known as the input circuit) and a controlled system (also known as the output circuit). It can realize the circuit isolation of the input circuit and the output circuit. Magnetic force, so it has better interference isolation ability, and at the same time, the current passing ability of the output circuit can be designed to be very high, which is an ideal device for realizing small signal control of large current switch. Relays are usually used in automatic control circuits, and are an "automatic switch" that uses smaller currents to control larger currents. However, in some applications with high safety requirements, the wrong connection of the relay will cause serious safety accidents. For example, the abnormal connecti...
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IPC IPC(8): H03K17/78
Inventor 孙秀芳刘泽季红益
Owner BEIJING UNION UNIVERSITY