Electromagnetic valve driving circuit with overcurrent protection function
A solenoid valve driving and over-current protection technology, which is applied to electromagnets with armatures, circuits, electromagnets, etc., can solve problems such as low reliability, easy adhesion of contacts, and easy interference of relays, and achieve simple and stable circuits Good performance and high economical effect
Inactive Publication Date: 2017-05-31
QINGAN GRP
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Problems solved by technology
[0002] At present, relays are mostly used to control solenoid valves. Relays have problems such as being susceptible to interference, and the contacts are easy to stick when energized for a long time. The reliability is low, and it has been listed as a banned product for aviation.
Method used
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[0010] Such as figure 1 As shown, when the input control signal is 0V, the triode V1 is not conducting, and the voltage of the c pole is equal to 15V. The voltage of the MOS tube Q1G pole is 15V, the Q1D pole and the S pole are turned on, the solenoid valve coil has current flowing, and the solenoid valve is turned on.
[0011] At this time, if the voltage across R4 is less than 0.7V, that is, the flowing current is less than 0.7V / 0.1Ω=7A, then the triode V2 will not conduct, V3 will not conduct, and Q1 will continue to conduct.
[0012] If the voltage across R4 is greater than or equal to 0.7V, that is, the flowing current is greater than or equal to 7A, then the triode V2 will be turned on, and V3 will also be turned on. The voltage at the G pole of Q1 will be about 1.4V, and Q1 will not be turned on until it is powered on again.
[0013] When the input control signal is 5V, the triode V1 is turned on, and the voltage of the c pole is equal to 0.7V. The voltage of the MOS ...
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The invention belongs to the field of electronic control, and particularly relates to an electromagnetic valve driving circuit with an overcurrent protection function. At present, relays are mainly used for controlling electromagnetic valves, however, the relays have the problems that the relays are prone to being disturbed, and contacts are prone to adhesion after being in the power-on state for a long time, the reliability is poor, and thus the relays are ranked as forbidden products in the aviation field. An MOS tube is used as a core control device of the driving circuit, the control signal end of the driving circuit is connected with the base electrode of a triode V1 through a resistor R1, the emitter electrode of the triode V1 is grounded, and the collector electrode is connected with a +15 V power source through a resistor R2 and connected with the collector electrode of a triode V2 and the base electrode of a triode V3 after passing through a resistor R3. By adoption of the electromagnetic valve driving circuit with the overcurrent protection function, the effect of controlling high voltage through low voltage and controlling high current through low current can be effectively achieved.
Description
technical field [0001] The invention belongs to the field of electronic control, and in particular relates to an electromagnetic valve driving circuit with an overcurrent protection function. Background technique [0002] At present, relays are mostly used to control solenoid valves. Relays are susceptible to interference, and the contacts are easy to stick when they are energized for a long time. The reliability is low, and they have been listed as banned products for aviation. Contents of the invention [0003] The drive circuit involved in the present invention uses MOS transistors as the core control device, which can effectively realize low voltage control of high voltage and small current control of large current. [0004] In the solenoid valve drive circuit with overcurrent protection function of the present invention, the control signal terminal of the drive circuit is connected to the base of the triode V1 through the resistor R1, the emitter of the triode V1 is g...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F16K31/06H01F7/18
CPCF16K31/0675H01F7/1838
Inventor 郭宏选阮涛
Owner QINGAN GRP