# US 2017/0285577 A1 · Shock detector circuit

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- Number: US 2017/0285577 A1
- Document ID: US20170285577A1
- Status: Published application
- Kind: A1
- Application number: 15/507,373
- Filed: 2015-09-03
- Published: 2017-10-05
- Earliest claimed: 2014-09-05
- Assignees: EM Microelectronic-Marin SA
- Applicants: EM Microelectronic-Marin SA
- Inventors: Yves GODAT; Nicolas JEANNET
- Web page: https://patentgrep.com/patent/US20170285577A1

## CPC

- G04C 3/143: {Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step}
- H02P 8/02: specially adapted for single-phase or bi-pole stepper motors, e.g. watch-motors, clock-motors
- G01P 15/00: Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G04C: ELECTROMECHANICAL CLOCKS OR WATCHES
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G})

## Abstract

An electronic device including: a calculation unit configured to generate a signal representative of a physical magnitude, for a motor driving a display device, the motor including two terminals, one positive and one negative, via which the calculation unit controls the motor; at least one shock detection circuit connected between the calculation unit and one terminal of the motor for detection of an external shock applied to the motor. The shock detection circuit includes a comparison part comparing an induced voltage generated in the motor following a shock to a predetermined reference voltage to identify a shock, and a selection part.

## Claims

### Claim at position 1

1-7. (canceled)

### Claim 8

An electronic device comprising:
a calculation unit configured to generate a signal representative of a physical variable, for a motor driving a display device, the motor comprising two terminals, one positive and one negative, via which the calculation unit controls the motor;
at least one circuit configured for shock detection connected between the calculation unit and one terminal of the motor for the detection of an external shock applied to the motor capable of moving a rotor of the motor;
wherein the circuit configured for shock detection includes a selection part directly connected to one of the motor terminals, to vary an induced voltage generated in the motor following a shock with a movement of the rotor to improve sensitivity of the shock detector circuit, and a comparison part including a positive input and a negative input and connected to the selection part for comparing an output signal from the selection part to a predetermined reference voltage to identify a shock; and
wherein the selection part comprises a series of series connected resistors, a first of the resistors being connected to the motor connection terminal and a last resistor of the series connected to ground;
the selection part further comprising a selector including an output connected to the positive input of the comparison part and a plurality of selection points, each connected to one resistor.

### Claim 9 (depends on 8)

The electronic device according to claim 8, wherein the electronic device comprises two circuits configured for shock detection each connected between the calculation unit and one terminal of the motor for detection of an external shock applied to the motor, one circuit configured for shock detection being connected to the positive terminal whereas the other is connected to the negative terminal.

### Claim 10 (depends on 8)

The electronic device according to claim 8, wherein the selection part further comprises an activation transistor in series with the series of resistors for activating or deactivating the shock detection circuit.

### Claim 11 (depends on 8)

The electronic device according to claim 8, wherein the predetermined reference voltage is connected to the negative terminal of the comparison part.

### Claim 12 (depends on 8)

The electronic device according to claim 8, wherein the predetermined reference voltage is negative or positive.

### Claim 13 (depends on 8)

The electronic device according to claim 8, wherein the comparison part includes a first pair and a second pair of series connected transistors, each pair comprising one p-type transistor and one n-type transistor, gates of the transistors of same type being connected together, gates of the p-type transistors being connected to a current source, a gate of the n-type transistor of the first pair being connected to a drain thereof, drains of the p-type transistors being connected to a supply voltage, a source of the n-type transistor of the first pair being connected to the output of the selection part, whereas a drain of the n-type transistor of the second pair is connected to ground.