Holding coil for electronic lock

An electronic lock, the electronic lock comprising:

• a locking mechanism comprising a bolt and extensions coupled with the bolt;
• a cartridge comprising a body portion and extension receiving portions, the extension receiving portions configured to receive the extensions of the locking mechanism;
• a first coil positioned around the cartridge;
• a core disposed within the cartridge and substantially within the first coil;
• a first sliding barrier disposed within the cartridge and comprising a first magnetic material, the first sliding barrier selectively in communication with one or more of the extensions of the locking mechanism, the first sliding barrier being located on a first side of the core and being magnetically attracted to the core;
• a second sliding barrier disposed within the cartridge and comprising a second magnetic material, the second sliding barrier selectively in communication with one or more of the extensions of the locking mechanism, the second sliding barrier being located on a second side of the core and being magnetically attracted to the core;
• a second coil positioned around the cartridge, the second coil being spaced from the first coil and being positioned on the first side of the core;
• a third coil positioned around the cartridge, the third coil being spaced from the first coil and being positioned on the second side of the core;
• and
• a control circuit in communication with the first, second, and third coils, the control circuit operative to:
• energize the first coil to create a magnetic field in the core, the magnetic field causing the first and second sliding barriers to move away from the core, and
• energize the second and third coils after a predetermined time has elapsed, such that the first sliding barrier is magnetically attracted to the second coil and the second sliding barrier is magnetically attracted to the third coil, thereby allowing actuation of the locking mechanism.