System and method for controlling a set of bi-stable solenoids for electromagnetic locking systems
AssigneeRfid Mexico, S.A. De C.V.
InventorsRafael Guillermo Ramos ELIZONDO, Antonio Vidaurri OJEDA
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Abstract
A system and a method for controlling a set of bi-stable solenoids for locking applications which eliminates the direct connection of the power supply and solenoid by introducing a capacitor and a switch between the power supply and solenoid, thus eliminating the need of a dedicated h-bridge for every solenoid, and reducing the control lines required for each solenoid such that after the initial control lines, every subsequent solenoid requires only one control line to select the appropriate solenoid.
Claims5
A system for controlling a set of bi-stable solenoids for electromagnetic locking systems comprising:
- a power supply
- a capacitor charge circuit connected to the power supply;
- a polarity control circuit connected to the capacitor charge circuit;
- and
- a solenoid select circuit connected to the polarity control circuit.
A method for controlling a set of bi-stable solenoids for electromagnetic locking systems comprising:
- providing a power supply
- providing a capacitor charge circuit comprising a capacitor located parallely to the power supply, having a switch that connects a positive lead of the capacitor to either the power supply or to a polarity control circuit by means of a first power lead, and a second power lead connects a negative lead of the capacitor to the power source and to said polarity control circuit;
- providing a polarity control circuit comprised by a first and a second switch, each having a first and a second pole connected to the positive and negative power leads of the capacitor charge circuit respectively by means of the first and a second power lead, and each having a center pole each connected to a solenoid selector circuit by means of a fourth and a fifth power lead respectively;
- providing a solenoid selector circuit connected to the polarity control circuit, said solenoid selector circuit having at least one solenoid, each having a first and a second pole, wherein the first pole of each solenoid is connected to a respective switch, and said solenoid selector circuit receiving fourth and fifth power lead from the polarity control circuit wherein the fifth power lead is connected to the second pole of all solenoids and the fourth lead is connected to each solenoid switch in the circuit, as a common to all the switches;
- enabling one of the switches in the polarity control system to generate either positive polarity or negative polarity;
- setting the solenoid control switches to enable the at least one solenoid that are required to change state
- changing the capacitor switch to connect its power lead to the polarity control circuit and to the solenoids;
- and
- returning the capacitor to its default state and release all other switches.
Dependencies are inferred from the claim text.