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 configured 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 drop caused by 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 configured to be installed in an electric system including an electric storage device, the switch failure detection device including 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 drop caused by the at least one electronic switch, and a controller.
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Citations
10 Claims
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1. A switch failure detection device configured 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 drop caused by 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, 7, 8)
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4. A switch failure detection device configured 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 drop caused by 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 (5, 6)
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9. 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 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 drop caused by 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 dose not turn off according to the off-command signal if the input-output voltage is lower than the reference voltage.
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10. 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 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 drop caused by 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 dose 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