Switch failure detection device, battery pack including the same, and method of detecting failure of electronic switch
First Claim
1. A switch failure detection device to be installed in an electric system including an electric storage device, the switch failure detection device comprising:
- at least one electronic switch to be connected in a path in which a charging current to the electric storage device and a discharging current from the electric storage device flow, the at least one electronic switch including a first electronic switch;
at least one rectifier for passing a discharging current by bypassing the electronic switch when the electronic switch is turned off, the at least one rectifier including a first rectifier being connected parallel to or being parasitic to the first electronic switch such that a forward direction thereof corresponds to a direction in which the discharging current flows;
a switch voltage detection circuit configured to detect a voltage between an input andan output of the at least one electronic switch; and
a controller for;
determining whether the electric storage device is in a discharging state;
sending an off-command signal to the first electronic switch to turn off the first electronic switch if the electric storage device is in the discharging state;
receiving the voltage detected by the switch voltage detection circuit while the off-command signal is sent to the first electronic switch;
determining an input-output voltage of the at least one electronic switch based on the voltage;
determining whether the input-output voltage is lower than a reference voltage;
and determining the first electronic switch has a turn-off problem in which the first electronic switch does not turn off according to the off-command signal if the input-output voltage is lower than the reference voltage.
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Accused Products
Abstract
A switch failure detection device includes a switch, a rectifier, a switch voltage detection circuit, and a controller. The switch is connected in a path in which a charging current to and a discharging current flow. The rectifier passes a discharging current by bypassing the switch when the switch is turned off. The detection circuit detects a voltage between an input and an output of the switch. The controller is configured to: determine whether the electric storage device is in a discharging state; send an off-command signal to the switch if the electric storage device is in the discharging state; receive the voltage; determine an input-output voltage of the switch based on the voltage; determine whether the input-output voltage is lower than a first reference voltage; and determine the switch has a turn-off problem if the input-output voltage is lower than the first reference voltage.
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Citations
18 Claims
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1. A switch failure detection device to be installed in an electric system including an electric storage device, the switch failure detection device comprising:
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at least one electronic switch to be connected in a path in which a charging current to the electric storage device and a discharging current from the electric storage device flow, the at least one electronic switch including a first electronic switch; at least one rectifier for passing a discharging current by bypassing the electronic switch when the electronic switch is turned off, the at least one rectifier including a first rectifier being connected parallel to or being parasitic to the first electronic switch such that a forward direction thereof corresponds to a direction in which the discharging current flows; a switch voltage detection circuit configured to detect a voltage between an input and an output of the at least one electronic switch; and a controller for; determining whether the electric storage device is in a discharging state; sending an off-command signal to the first electronic switch to turn off the first electronic switch if the electric storage device is in the discharging state; receiving the voltage detected by the switch voltage detection circuit while the off-command signal is sent to the first electronic switch; determining an input-output voltage of the at least one electronic switch based on the voltage; determining whether the input-output voltage is lower than a reference voltage; and determining the first electronic switch has a turn-off problem in which the first electronic switch does not turn off according to the off-command signal if the input-output voltage is lower than the reference voltage. - View Dependent Claims (2, 3, 4, 5, 11, 15, 16, 17, 18)
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6. A switch failure detection device to be installed in an electric system including an electric storage device, the switch failure detection device comprising:
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at least one electronic switch to be connected in a path in which a charging current to the electric storage device and a discharging current from the electric storage device flow, the at least one electronic switch including a first electronic switch; at least one rectifier for passing a charging current by bypassing the electronic switch when the electronic switch is turned off, the at least one rectifier including a first rectifier being connected parallel to or being parasitic to the first electronic switch such that a forward direction thereof corresponds to a direction in which the charging current flows; a switch voltage detection circuit configured to detect a voltage between an input and an output of the at least one electronic switch; and a controller for; determining whether the electric storage device is in a charging state; sending an off-command signal to the first electronic switch to turn off the first electronic switch if the electric storage device is in the charging state; receiving the voltage detected by the switch voltage detection circuit while the off-command signal is sent to the first electronic switch; determining an input-output voltage of the at least one electronic switch based on the voltage; determining whether the input-output voltage is lower than a reference voltage; and determining the first electronic switch has a turn-off problem in which the first electronic switch does not turn off according to the off-command signal if the input-output voltage is lower than the reference voltage. - View Dependent Claims (7, 8, 9, 10, 12)
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13. A method of detecting a failure of an electronic switch in an electric system including an electric storage device, the electronic switch, and a rectifier, the electronic switch being connected in a path in which a charging current to the electric storage device and a discharging current from the electric storage device flow, the rectifier being configured to pass a discharging current by bypassing the electronic switch when the electronic switch is turned off, the rectifier being connected parallel to or being parasitic to the electronic switch such that a forward direction thereof corresponds to a direction in which the discharging current flows, the method comprising:
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determining whether the electric storage device is in a discharging state; sending an off-command signal to the electronic switch to turn off the electronic switch if the electric storage device is in the discharging state; detecting a voltage between an input and an output of the electronic switch while the off-command signal is sent to the electronic switch; determining an input-output voltage of the electronic switch based on the detected voltage; determining whether the input-output voltage is lower than a reference voltage; and determining the electronic switch has a problem in which the switch does not turn off according to the off-command signal if the input-output voltage is lower than the reference voltage.
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14. A method of detecting a failure of an electronic switch in an electric system including an electric storage device, the electronic switch, and a rectifier, the electronic switch being connected in a path in which a charging current to the electric storage device and a discharging current from the electric storage device flow, the rectifier being configured to pass a charging current by bypassing the electronic switch when the electronic switch is turned off, the rectifier being connected parallel to or being parasitic to the electronic switch such that a forward direction thereof corresponds to a direction in which the charging current flows, the method comprising:
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determining whether the electric storage device is in a charging state; sending an off-command signal to the electronic switch to turn off the electronic switch if the electric storage device is in the charging state; detecting a voltage between an input and an output of the electronic switch while the off-command signal is sent to the electronic switch; determining an input-output voltage of the electronic switch based on the detected voltage; determining whether the input-output voltage is lower than a reference voltage; and determining the electronic switch has a problem in which the switch does not turn off according to the off-command signal if the input-output voltage is lower than the reference voltage.
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Specification