公开(公告)号：US10573450B2

公开(公告)日：2020-02-25

申请号：US15698853

申请日：2017-09-08

Applicant: Hanchett Entry Systems, Inc.

Inventor： Brett L. Davis ,  Randall Shaffer ,  Eric Anderson

IPC: H01F13/00 ,  E05B47/00 ,  E05C19/16

Abstract: A novel and useful degauss circuit for use with electromagnetic door locks. The door lock circuit is configured to provide a constant current to the electromagnetic coil load. A pulse width modulation (PWM) controller varies the frequency and/or duty cycle to a switch in series with the coil. Coil current feedback is used to adjust the PWM frequency and/or duty cycle so as to maintain the current through the coil at a certain level to maintain a desired holding force on the door lock. A degauss circuit inline with the current flowing through the coil is provided. When triggered either in an uncontrolled or controlled manner, a series RLC circuit that includes the coil inductance and resistance causes ringing to occur whereby the coil current reverses direction with sufficient amplitude and duration to degauss the coil.

公开(公告)号：US20170092029A1

公开(公告)日：2017-03-30

申请号：US15202169

申请日：2016-07-05

Applicant: Hanchett Entry Systems, Inc.

Inventor： Eric Anderson

IPC: G07C9/00

CPC classification number: G07C9/00126 ,  G05B19/042 ,  G05B2219/2628 ,  H01H9/00

Abstract: A REX activation detection and control module system configured to allow a REX device having at least four connectors to electrically connect with ACS devices having at least four connectors, while only connecting two wires to the REX device. The system comprises a first REX input/output device comprising two couplings and a second REX input/output device comprising at least four couplings. The system also comprises a current sense amplifier electrically connected to the first REX input/output device, the current sense amplifier configured to measure current from either the first REX input/output device. The system also comprises a microcontroller electrically connected to the current sense amplifier, the microcontroller configured to monitor the rolling average of the measured current output from the current sense amplifier. When the microcontroller detects an anomaly within the rolling average of the measured current, the microcontroller will activate the relay.

公开(公告)号：US10026247B2

公开(公告)日：2018-07-17

申请号：US15202169

申请日：2016-07-05

Applicant: Hanchett Entry Systems, Inc.

Inventor： Eric Anderson

IPC: G07C9/00 ,  H01H9/00 ,  G05B19/042

Abstract: A REX activation detection and control module system configured to allow a REX device having at least four connectors to electrically connect with ACS devices having at least four connectors, while only connecting two wires to the REX device. The system comprises a first REX input/output device comprising two couplings and a second REX input/output device comprising at least four couplings. The system also comprises a current sense amplifier electrically connected to the first REX input/output device, the current sense amplifier configured to measure current from either the first REX input/output device. The system also comprises a microcontroller electrically connected to the current sense amplifier, the microcontroller configured to monitor the rolling average of the measured current output from the current sense amplifier. When the microcontroller detects an anomaly within the rolling average of the measured current, the microcontroller will activate the relay.

公开(公告)号：US20180075961A1

公开(公告)日：2018-03-15

申请号：US15698853

申请日：2017-09-08

Applicant: Hanchett Entry Systems, Inc.

Inventor： Brett L. Davis ,  Randall Shaffer ,  Eric Anderson

IPC: H01F13/00 ,  E05B47/00 ,  E05C19/16

CPC classification number: H01F13/006 ,  E05B47/0002 ,  E05B2047/0048 ,  E05B2047/0068 ,  E05C19/166

Abstract: A novel and useful degauss circuit for use with electromagnetic door locks. The door lock circuit is configured to provide a constant current to the electromagnetic coil load. A pulse width modulation (PWM) controller varies the frequency and/or duty cycle to a switch in series with the coil. Coil current feedback is used to adjust the PWM frequency and/or duty cycle so as to maintain the current through the coil at a certain level to maintain a desired holding force on the door lock. A degauss circuit inline with the current flowing through the coil is provided. When triggered either in an uncontrolled or controlled manner, a series RLC circuit that includes the coil inductance and resistance causes ringing to occur whereby the coil current reverses direction with sufficient amplitude and duration to degauss the coil.