WO2004088696A1 - リレー接点の溶着の検出方法及び装置 - Google Patents
リレー接点の溶着の検出方法及び装置 Download PDFInfo
- Publication number
- WO2004088696A1 WO2004088696A1 PCT/JP2004/004410 JP2004004410W WO2004088696A1 WO 2004088696 A1 WO2004088696 A1 WO 2004088696A1 JP 2004004410 W JP2004004410 W JP 2004004410W WO 2004088696 A1 WO2004088696 A1 WO 2004088696A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- relay
- stage
- contact
- circuit
- load circuit
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
Definitions
- the present invention relates to a system having a DC power source such as a secondary battery and a load circuit such as an inverter circuit driven by the DC power source.
- a DC power source such as a secondary battery
- a load circuit such as an inverter circuit driven by the DC power source.
- the DC power source and the load circuit The present invention relates to a method and an apparatus for detecting welding at relay contacts inserted into a pair of power lines between each other.
- a hybrid electric vehicle or an electric vehicle has a configuration in which a motor is driven by electric power from a DC power source such as a secondary battery.
- a DC power source such as a secondary battery.
- the power from the DC power supply is supplied to the inverter, and the inverter should be supplied to the motor. Electric power or DC power is generated.
- an inverter it is possible to control the rotational speed and output torque of the inverter, switching control in the inverter.
- an assembled battery of a lithium ion secondary battery is used as the DC power source, and the voltage between terminals as the assembled battery is, for example, 2 8 8 V.
- a DC power supply capable of flowing a large current at a voltage of 200 V or higher is used.
- a relay contact is inserted into each of the positive and negative power supply lines so that the DC power supply is completely disconnected from the load circuit side such as inverter when the DC power supply is not used.
- the load fluctuation is significant and the input voltage to the load circuit, such as inverter, fluctuates greatly. To reduce this, the power supply line on the input side of the load circuit is reduced.
- a large capacitor for smoothing is provided between the positive and negative electrodes.
- Fig. 1 shows a circuit in which an assembled battery constructed by connecting multiple cells of a secondary battery in series is used as a DC power supply, and relay contacts are inserted into the positive and negative power supply lines from this DC power supply. An example is shown.
- This circuit supplies power from the assembled battery 10 to a load circuit 16 such as an inverter circuit.
- a load circuit 16 such as an inverter circuit.
- the contact of the first main relay 11 is inserted in the power line extending from the positive electrode of the assembled battery 10 to one end of the load circuit 16, and the first main relay 11 1 On (conduction) Off (cutoff) control enables the electrical connection between the assembled battery 1 0 and the negative end of the load circuit 1 6 to be controlled.
- the contact point of the second main relay 12 is inserted in the power supply line extending from the negative electrode of the assembled battery 10 to the other end of the load circuit 16.
- the load circuit 16 is provided with a large-capacity capacitor 15 in parallel.
- the main relays 1 1 and 1 2 are caused by a large inrush current to the capacitor 15 when the contacts of the main relays 1 1 and 12 are both turned off and turned on. There is a possibility that the contact of the metal will be welded, that is, fixed. If such welding occurs, the relay contact will never transition to the interrupted state, and the relay function will be lost. Of course, depending on the electrical characteristics of the load circuit 16 itself, a large inrush current that causes welding of the relay contact may flow even if the capacitor 15 is not provided. Therefore, a series circuit composed of a resistor 14 and a contact of the precharge relay 13 is provided in parallel with the contact of the main relay 11 1 to prevent welding of the relay contact.
- JP 2 0 0 0-2 7 0 5 6 1 discloses that when an inverter circuit is used as a load circuit, both the positive and negative main relays are controlled to be off. It is disclosed that the welding of the main relay is detected by detecting whether or not the output current of the inverter converges to zero after a certain time. If it does not converge to zero after a certain period of time, the main relay must have been turned off, but power is being supplied from the DC power supply side, so it is determined that the main relay contact has welded. However, with this method, it cannot be determined that welding has occurred at the contact points of both main relays, and it cannot be detected that welding has occurred on either side.
- JP-A 6-2 3 3 4 0 1 uses a relay having a mechanism for detecting the state of the movable part as a main relay, and the relay is not controlled to be in a conductive state. Regardless of this, it is disclosed that when the movable part of the relay is in a position corresponding to the conduction state, it is detected that there is an abnormality such as welding. However, in this method, it is necessary to provide a special mechanism for detecting the state of the moving part in the main relay, so that it lacks versatility and the reliability of the special mechanism itself is sufficient. Attention must be paid to.
- Japanese Patent Publication Japanese Patent Application Laid-Open No. 2 00 8-7 8 8 5 1 is provided with a relay, that is, a discharge relay for forcibly discharging a capacitor in a circuit similar to the circuit shown in FIG.
- a relay that is, a discharge relay for forcibly discharging a capacitor in a circuit similar to the circuit shown in FIG.
- a resistor is inserted in series with the contact of the discharge relay.
- the method of inserting a resistor in series with a relay contact is practically not applicable to the main relay described above, in which the contact is inserted directly between the DC power supply and the load circuit. .
- Japanese patent publication: Japanese Laid-Open Patent Publication No. 2 0 0 0-1 7 3 4 2 8 is a light emission connected between the DC power supply side of one main relay contact and the load circuit side of the other main relay contact Similarly to the first welding detection circuit using a photopower bra that includes an element, a light emitting element connected between the DC power supply side of the contact of the other main relay and the load circuit side of the contact of one main relay.
- the second welding detection circuit using the included force bra is provided, and by using these welding detection circuits, it is described that the welding at the contact of the main relay can be detected independently.
- an object of the present invention is to provide a method capable of independently detecting which of the contacts of the positive and negative main relay contacts is welded without causing an increase in cost. is there.
- a first object of the present invention is to provide a DC power source having first and second terminals, a load circuit connected to the first and second terminals and supplied with power from the DC power source, and a first terminal
- a first main relay having a contact inserted between one end of the load circuit, a second main relay having a contact inserted between the second terminal and the other end of the load circuit, and the first main relay
- a precharge relay that is provided in parallel with a contact of a relay and includes a series circuit of a resistor and a contact, and a method for detecting welding of a relay contact in a circuit having the first and second main relays being turned on.
- a second object of the present invention is to provide a DC power source having first and second terminals, a load circuit connected to the first and second terminals and supplied with power from the DC power source, and a first terminal
- a first main relay having a contact inserted between one end of the load circuit, a second main relay having a contact inserted between the second terminal and the other end of the load circuit, and the first main relay
- the first and second main relays and the precharge relay are controlled to be turned off from the normal operation state in which the detection means and the first and second main relays are controlled to be turned on and the precharge relay is controlled to be turned off.
- the instruction input means for inputting the instruction to enter the hibernation state, and when the instruction is input, the sequence control is performed for the first and second main relays and the precharge relay, and the voltage accompanying the progress of the sequence control. Achieved by a device having a control means for individually detecting welding of relay contacts from a change in voltage detected by the detection means. Is done.
- the circuit described above is provided with a capacitor for connecting both ends of the load circuit.
- sequence control includes the first stage in which the first main relay is turned off, and the precharge relay is turned on after the first stage. 2nd stage to control, 3rd stage to turn off 2nd main relay after 2nd stage, and 3rd stage to control off precharge relay after 3rd stage and shift to dormant state It is preferable to have a fourth stage.
- a sequence for each relay can be performed when shifting from a normal operation state to a sleep state without using a relay having a special mechanism or providing an additional detection circuit. By performing the control, it is possible to independently and reliably detect the welding at each of the main relay contacts on the positive side and the negative side of the DC power supply.
- FIG. 1 is a circuit diagram showing a typical circuit including relay contacts.
- FIG. 2 is a diagram showing an example of a circuit to which the method for detecting welding of a relay contact according to the present invention is applied.
- FIG. 3 is a diagram showing processing as a time sequence in the method for detecting welding of relay contacts according to an embodiment of the present invention.
- FIG. 4 is a flowchart showing the operation of the control circuit.
- FIG. 2 is a diagram showing an example of a circuit to which the detection method according to the present invention is applied.
- This circuit is intended for application in electric vehicles or hybrid electric vehicles, and has the same configuration as the circuit shown in FIG. However, compared to FIG. 1, FIG. 2 controls the load circuit 16 and controls on / off of the first main relay 11, the second main relay 12, and the precharge relay 13.
- Circuit 2 1 voltage measurement unit 2 2 that measures the voltage across capacitor ⁇ 5, that is, the voltage across load circuit 16, and outputs it to control circuit 2 1, and ignition in an electric vehicle or 8 hybrid electric vehicle This is different in that the ignition key switch 2 3 linked to the key is explicitly shown.
- the load circuit 16 is typically an inverse circuit.
- control circuit 21 Since this circuit is a circuit for an electric vehicle or a hybrid vehicle, the control circuit 21 itself does not operate with the electric power from the assembled battery 10, but a low-voltage (eg, 2 V) storage battery provided separately. Operates with power from the auxiliary power supply (not shown).
- a low-voltage (eg, 2 V) storage battery provided separately. Operates with power from the auxiliary power supply (not shown).
- a control circuit 21 that controls each relay 1 1 to 1 3 and a load circuit 1 6 that is an inverter circuit is provided, and the idle key switch 2 3 controls this. Connecting to circuit 21 is a configuration obvious to those skilled in the art.
- the inverse circuit (load circuit 16) is provided with a measurement circuit for measuring the input voltage, and therefore the measurement circuit can be used as the voltage control unit 22.
- the circuit configuration itself shown in Fig. 2 is a common circuit for vehicles. Rather, as described below, the present invention independently detects welding at the contact points of the main relays 11 and 12 by using a control sequence based on software control for the relays while using such a general circuit. Try It is characterized by that.
- the first and second control sequences are devised by devising the ON / OFF control sequence for each of the relays 11 to 13 without using a special detection circuit or a relay having a special structure. Contact welding in the main relays 11 and 12 can be detected independently.
- Figure 3 shows the sequence for detecting the arrival here.
- the control circuit 21 when the normal operation state transits to the hibernation state, the control circuit 21 performs on / off control sequence control for each of the relays 1 1 to 1 3, and the relays 1 1 to 1 3 Detect contact welding.
- the normal operation state is a state in which power is supplied from the assembled battery 10 to the load circuit 16 for driving the motor, for example, in the case of a circuit for an electric vehicle or a hybrid vehicle.
- the resting state is a state in which the supply of power to the load circuit 16 is stopped.
- the contacts of the first main relay 1 1 and the second main relay 1 2 are both controlled to be on (conducting state).
- the contacts of the precharge relay 1 3 are controlled to be off (disconnected state).
- the capacitor 15 is charged to the voltage of the assembled battery 10.
- the ignition key of the vehicle is turned off here, this is detected by the ignition key switch 2 3 and notified to the control circuit 2 1.
- the control circuit 2 1 detects the detection of welding and the transition to the sleep state. Start the sequence for First, in phase 2, the contact of the first main relay 11 on the positive side is controlled to be off.
- the contact of each relay is normal, the charge charged in the capacitor 15 will be discharged through the load circuit 16, and the voltage across the capacitor 15 will decrease toward zero. .
- the capacitor 15 will continue to be supplied with power from the assembled battery 10, and the first main relay 1 It can be determined that the contact of at least one of the precharge relay 1 3 and the relay of the precharge relay 1 3 is welded and fixed. Since the current flowing through the contact of the precharge relay 1 3 is limited by the resistor 14, the resistance of the precharge relay 1 3 can be welded by appropriately selecting the value of the resistor 14. In such a case, it is possible to reliably determine that the contact of the first main relay 11 is welded.
- the voltage across the capacitor 15 is almost the voltage between the terminals of the assembled battery 10, whereas the contact of the first main relay 11 is
- the voltage at both ends of capacitor 15 is between the terminals of battery pack 10 by the voltage dividing circuit consisting of resistor 14 and load circuit 6
- the voltage is divided. Therefore, depending on the value of the resistor 14, the contact between the first main relay 1 1 and the precharge relay 1 3 can be detected by detecting the value at which the voltage across the capacitor ⁇ 5 converges. It is also possible to isolate welding events.
- phase 3 following phase 2 as described above, the contact of precharge relay 1 3 is controlled to be on.
- the capacitor 15 is charged via the precharge relay 13 and the voltage across the capacitor 15 increases.
- the contact of the second main relay 1 2 on the negative side is turned off. If the contact of each relay is normal, the charge charged in the capacitor 15 will be discharged through the load circuit ⁇ 6, and the voltage across the capacitor 15 will decrease toward zero.
- the capacitor 15 will continue to be supplied with power from the assembled battery 10 and the second main relay 1 It can be determined that the two contacts are welded and fixed.
- the precharge relay 13 is controlled to be turned off to shift to the phase 5 that is in a dormant state.
- the supply of power from the auxiliary power supply to the control circuit 21 can be stopped after the transition to the phase 5 by the self shirt down function of the control circuit 21 itself.
- the sequence for detecting the welding of the relay contact in the present embodiment has been described.
- a relay having a special structure is not used, and a detection circuit is not substantially added. It is possible to reliably and independently detect contact welding between the main relay 1 1 1 and the second main relay 1 2.
- the contact is normal through this sequence, Since all of the contacts of the relays 11 to 13 are in a disconnected state and are not welded during the period of the state, the safety of the circuit is further increased.
- the first and second main relays 1 and 12 are controlled to be on, and the precharge relay 13 is controlled to be off. This is the initial state for the processing described below.
- step 51 it is determined whether or not the ignition key is turned off and waits until it is turned off. If turned off, the first main relay 11 is controlled to be turned off in step 52. Then, in Step 53, it is determined whether or not the voltage measured by the voltage measuring unit 22 is decreased. If the voltage is decreased, the process proceeds to Step 55, and if not, Step 5 is performed. In step 4, it is determined that the contact of the first main relay 11 (or precharge relay 13) is welded, and an alarm is output. In Step 55, the precharge relay 55 is controlled to be turned on. When the capacitor 15 is charged due to elapse of a predetermined time, the second main relay 12 is controlled to be turned off in Step 56. .
- Step 57 it is determined whether or not the voltage measured by the voltage measuring unit 22 is lowered. If the voltage is lowered, the process proceeds to Step 59, and if not, the step is performed. 5 At 8, judge that the contact of the second main relay 12 is welded, and output an alarm. Also, an error code is recorded in the non-volatile memory area in the control circuit 21. Step In step 59, the precharge relay 59 is controlled to be turned off to shift to the rest state.
- the alarm output in Steps 5 4 and 5 8 includes, for example, display to the driver and recording of the error code in the nonvolatile memory area in the control circuit 21. If an error code is recorded in the non-volatile memory area, an alarm will be displayed to the driver again at the next start-up, for example, the next time the ignition key is turned on.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04724176A EP1610355B1 (en) | 2003-03-31 | 2004-03-29 | Relay contact welding detection method and apparatus |
JP2005504219A JP4572168B2 (ja) | 2003-03-31 | 2004-03-29 | リレー接点の溶着の検出方法及び装置 |
KR1020057018286A KR100750463B1 (ko) | 2003-03-31 | 2004-03-29 | 릴레이 접점의 용착의 검출 방법 및 장치 |
CNB200480008919XA CN100454466C (zh) | 2003-03-31 | 2004-03-29 | 用于检测继电器触点的熔接的方法和装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003095045 | 2003-03-31 | ||
JP2003-095045 | 2003-03-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004088696A1 true WO2004088696A1 (ja) | 2004-10-14 |
Family
ID=33127425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/004410 WO2004088696A1 (ja) | 2003-03-31 | 2004-03-29 | リレー接点の溶着の検出方法及び装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7368829B2 (ja) |
EP (1) | EP1610355B1 (ja) |
JP (1) | JP4572168B2 (ja) |
KR (1) | KR100750463B1 (ja) |
CN (1) | CN100454466C (ja) |
WO (1) | WO2004088696A1 (ja) |
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Also Published As
Publication number | Publication date |
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US7368829B2 (en) | 2008-05-06 |
EP1610355A1 (en) | 2005-12-28 |
JPWO2004088696A1 (ja) | 2006-07-06 |
US20060021098A1 (en) | 2006-01-26 |
JP4572168B2 (ja) | 2010-10-27 |
KR20060014029A (ko) | 2006-02-14 |
KR100750463B1 (ko) | 2007-08-22 |
EP1610355B1 (en) | 2012-12-05 |
EP1610355A4 (en) | 2009-01-28 |
EP1610355A8 (en) | 2006-03-15 |
CN1768407A (zh) | 2006-05-03 |
CN100454466C (zh) | 2009-01-21 |
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