Protection circuit for driving inductive load relay
A technology for protecting circuits and inductive loads. It is applied in the field of protective circuits for driving inductive load relays. It can solve the problems of ineffective protection of contacts, affecting the service life of relays, and sparks generated by contacts. Achievement and low cost effect
Inactive Publication Date: 2015-02-18
ATECH AUTOMOTIVE WUHU
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Problems solved by technology
[0003] In order to eliminate the arcing phenomenon caused by the inductive load driven by the relay, the diode (or voltage regulator) + voltage regulator is generally used in the current automotive module, but when the relay contact is disconnected, the induced voltage caused by the inductive load rises to Before the Zener tube conducts the voltage, there will still be a part of the induced voltage released through the arc of the contact ignition, which will be more obvious when the power supply voltage is high
Through the actual observation that when the relay drives the motor load, this method cannot effectively protect the contacts, and it will still cause electric sparks to be generated when the contacts are turned off and a small part of the contacts will be ablated
This situation seriously affects the service life of the relay
Method used
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[0013] Such as figure 2 As shown, the existing technology adopts the diode (or Zener tube) + Zener tube mode. When the relay contact is disconnected, before the induced voltage caused by the inductive load rises to the voltage of the Zener tube, there will still be a part The induced voltage is discharged by arcing at the contacts, which is more pronounced at higher supply voltages. It is actually observed that when the relay on the heavy-duty card module (24V system) drives the motor load, this method cannot effectively protect the contacts, and it will still cause sparks on the contacts when they are turned off and cause a small part of the contacts to be ablated. This situation seriously affects the service life of the relay.
[0014] In view of the deficiency of the traditional contact protection method, the present invention proposes a protection measure for releasing the induced voltage by means of an RC network. Such as figure 1 As shown, the series resistor and cap...
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The invention discloses a protection circuit for driving an inductive load relay. The protection circuit is characterized in that a resistor R and a capacitor C are connected in series to form an RC loop and then are connected to the two ends of an inductive load in parallel. Due to the adoption of the structure, the protection circuit has the advantages that cost is low, and implementation is easy, wherein when the working current value and the inductance value of the driven inductive load are large, high-power devices are needed for diodes and voltage-regulator tubes in a traditional mode, so that cost is high, but an RC network mode is simple and low in cost; the application range is wide, the RC network mode is suitable for both a direct current mode working circuit and an alternating current mode working circuit.
Description
technical field [0001] The invention relates to contact protection for driving inductive load relays, in particular to a protection circuit for driving inductive load relays. Background technique [0002] When the relay drives an inductive load, at the moment when the contact is turned off, due to the action of electromagnetic induction, a momentary high potential will be generated in the coil, and it and the power supply voltage will be superimposed on both ends of the contact, resulting in the arcing phenomenon of electric spark, which makes Contact ablation shortens the service life of the relay; in severe cases, it will cause the relay contacts to stick, and the consequences are disastrous. This requires effective protection measures to avoid harmful arcs. [0003] In order to eliminate the arcing phenomenon caused by the inductive load driven by the relay, the diode (or voltage regulator) + voltage regulator is generally used in the current automotive module, but when ...
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IPC IPC(8): H02H9/04
Inventor 陈泽坚
Owner ATECH AUTOMOTIVE WUHU