Diagnostic apparatus

Patent metadata

Field	Value
Publication number	US-11293997-B2
Application number	US-201816617405-A
Country	US
Kind code	B2
Filing date	Apr 17, 2018
Priority date	May 31, 2017
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A diagnostic apparatus includes a control device and an extension device connectable to the control device. The control device includes one or more cutoff blocks that switch between allowing and cutting off power supply to a load, a first diagnostic pulse generator that generates a diagnostic signal indicating that the power to the load is to be cut off, a first cutoff diagnosing device that detects a supply voltage to the load, and an extension device detector that determines whether the extension device is connected to the control device. The extension device includes a second diagnostic pulse generator that generates a diagnostic signal, and a second cutoff diagnosing device that detects a supply voltage to the load.

First claim

The invention claimed is:

1. A diagnostic apparatus, comprising:
a control device; and
an extension device connectable to the control device, wherein the control device includes:
a cutoff block that switches between allowing and cutting off power supply to a load;
a first diagnostic pulse generator that generates a first diagnostic signal indicating that the power supply to the load is to be cut off;
a first cutoff diagnosing device that detects a supply voltage to the load; and
an extension device detector that determines whether the extension device is connected to the control device,

the extension device includes:
a second diagnostic pulse generator that generates a second diagnostic signal; and
a second cutoff diagnosing device that detects a supply voltage to the load,

when the extension device detector has determined that the extension device is not connected to the control device,
the first diagnostic pulse generator outputs the first diagnostic signal to the cutoff block,
the cutoff block cuts off the power supply to the load in response to the first diagnostic signal output from the first diagnostic pulse generator, and
the first cutoff diagnosing device diagnoses whether there is a failure in the cutoff block based on the supply voltage to the load that is detected, and

when the extension device detector has determined that the extension device is connected to the control device,
the second diagnostic pulse generator outputs the second diagnostic signal to the cutoff block,
the cutoff block cuts off the power supply to the load in response to the second diagnostic signal output from the second diagnostic pulse generator, and
the second cutoff diagnosing device diagnoses whether there is a failure in the cutoff block based on the supply voltage to the load that is detected.

2. The diagnostic apparatus according to claim 1 , wherein the first diagnostic signal and the second diagnostic signal are outputted to the cutoff block at different cycles or with different phases.

3. The diagnostic apparatus according to claim 1 , wherein when the extension device detector has determined that the extension device is connected to the control device, the first cutoff diagnosing device further diagnoses whether there is a failure in the extension device based on whether the second diagnostic signal output from the second diagnostic pulse generator is detected.

4. A diagnostic apparatus, comprising:
a motor controlling device; and
an extension device connectable to the motor controlling device, wherein the motor controlling device includes:
an inverter circuit that controls a voltage to be applied to a motor through Pulse Width Modulation (PWM) control;
a driving circuit that drives the inverter circuit;
a cutoff circuit that switches between allowing and cutting off power supply to the driving circuit;
a first diagnostic pulse generator that generates a first diagnostic signal indicating that the power supply to the driving circuit is to be cut off;
a first cutoff diagnosing device that detects a supply voltage to the driving circuit; and
an extension device detector that determines whether the extension device is connected to the motor controlling device,

the extension device includes:
a second diagnostic pulse generator that generates a second diagnostic signal; and
a second cutoff diagnosing device that detects a supply voltage to the driving circuit,

when the extension device detector has determined that the extension device is not connected to the motor controlling device,
the first diagnostic pulse generator outputs the first diagnostic signal to the cutoff circuit,
the cutoff circuit cuts off the power supply to the driving circuit in response to the first diagnostic signal output from the first diagnostic pulse generator, and
the first cutoff diagnosing device diagnoses whether there is a failure in the cutoff circuit based on the supply voltage to the driving circuit that is detected, and

when the extension device detector has determined that the extension device is connected to the motor controlling device,
the second diagnostic pulse generator outputs the second diagnostic signal to the cutoff circuit,
the cutoff circuit cuts off the power supply to the driving circuit in response to the second diagnostic signal output from the second diagnostic pulse generator, and
the second cutoff diagnosing device diagnoses whether there is a failure in the cutoff circuit based on the supply voltage to the driving circuit that is detected.

5. The diagnostic apparatus according to claim 4 , wherein the first diagnostic signal and the second diagnostic signal are outputted to the cutoff circuit at different cycles or with different phases.

6. The diagnostic apparatus according to claim 4 , wherein when the extension device detector has determined that the extension device is connected to the motor controlling device, the first cutoff diagnosing device further diagnoses whether there is a failure in the extension device based on whether the second diagnostic signal output from the second diagnostic pulse generator is detected.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kishibe Taro
• Kishida Hideyuki
• Shimogaki Yusuke

Classifications

• G01R31/54

  Testing for continuity · CPC title

• H02H3/044

  Checking correct functioning of protective arrangements, e.g. by simulating a fault (for differential current circuit breakers H02H3/335) · CPC title

• H02P29/0241

  the fault being an overvoltage · CPC title

• G01R31/327

  Testing of circuit interrupters, switches or circuit-breakers · CPC title

• G01R31/3275

  Fault detection or status indication · CPC title