JP2016012411A - Charge control device and relay fixture detection method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge control device which suppresses the number of relay operations and is capable of identifying a fixed relay, and a relay fixture detection method thereof.SOLUTION: A charge control device 1 includes an ON/OFF control section and a fixture determination section. The ON/OFF control section performs ON/OFF control on a first relay 11 and a second relay 12, turns on the first relay before the second relay just for a predetermined time when starting charging, and turns off the first relay before the second relay just for a specific time when ending charging. In the case where a voltage detection circuit 30 detects that a voltage is being applied between both the first relay and the second relay from turning-on of the first relay by the ON/OFF control section to turning-on of the second relay, the fixture determination section determines that the second relay is in a fixed state and in the case where the voltage detection circuit detects that a voltage is being applied between both the first relay and the second relay from turning-off of the first relay to turning-off of the second relay, the fixture determination section determines that the first relay is in a fixed state.

Description

  The present invention relates to a charge control device and a relay sticking detection method thereof.

  2. Description of the Related Art Conventionally, there is known a charge control device that detects a fixed state that is maintained in an on state with a relay closed (see Patent Document 1). In this device, before the start of charging or after the end of charging, one of the positive-side relay and the negative-side relay is turned on and the other is turned off, and then one is turned off and the other is turned on. . Thereby, in the former case, a predetermined voltage is measured when the other is in a fixed state, and in the latter case, a predetermined voltage is measured when one is in a fixed state. Therefore, it is possible to detect the stuck relay and to identify the stuck relay. In particular, in this device, before charging is started or after the end of charging, for example, one is driven twice and the other is driven once to determine the relay fixation, and at the next determination timing, one is driven once and the other is driven. Drive twice to determine whether the relay is stuck. For this reason, it is possible to prevent the operation number of either relay from being separated.

JP 2012-1115045 A

  However, the device described in Patent Document 1 needs to drive one of the two times before the start of charging or after the end of charging, and the other needs to be driven twice at the timing of the next determination. The number of relay operations will increase.

  The present invention solves such a problem, and an object of the present invention is to provide a charge control device capable of suppressing the number of relay operations and specifying a fixed relay and a method for detecting the relay fixation. There is to do.

  The charging control device according to the present invention includes an L-phase line and an N-phase line provided between a power source and a charging target, a first relay provided on the L-phase line, and a first relay provided on the N-phase line. Two relays, a voltage detection circuit that is arranged between the L-phase line and the N-phase line and detects whether a voltage is applied between the two relays, and on / off-controls the first relay and the second relay. ON / OFF which turns on one of the first relay and the second relay at a predetermined time before the other at the start of charging and turns off at the predetermined time before the other at the end of charging. A voltage is applied between the control means and the voltage detection circuit during a period from when either one is turned on by the on / off control means until the other is turned on. Is detected, the voltage detection circuit determines that the other relay is in a fixed state, and the voltage is detected between the two by the voltage detection circuit during a period from when either one is turned off until the other is turned off. And a sticking judging means for judging that the one relay is in a sticking state when it is detected that the relay is applied.

  According to the charge control device of the present invention, when it is detected by the voltage detection circuit that a voltage is applied between the two during the period from when one is turned on to the other, the other It is determined that the relay is fixed. Here, when one is turned on and the other is in a fixed state, it is detected by the voltage detection circuit that a voltage is applied between the two, so that it is determined that the other relay is in a fixed state. Can do. Further, when it is detected by the voltage detection circuit that a voltage is applied between the two in the period from when either one is turned off to when the other is turned off, it is determined that one of the relays is fixed. . Here, when the other is turned on and one is fixed, it is detected by the voltage detection circuit that a voltage is applied between the two, and therefore it is determined that the other relay is fixed. Can do. In addition, one of the relays is turned on at a predetermined time before the other at the start of charging and turned off at a specified time before the other at the end of the charging. Therefore, it is not necessary to perform on / off control of the relay only for sticking detection, and sticking can be detected. Therefore, the number of relay operations can be reduced and the fixed relay can be specified.

  In the charging control apparatus according to the present invention, the voltage detection circuit may be configured such that the on / off control unit receives a control signal during a period from when either one is turned on to when the other is turned on. When it is detected that a voltage is applied between the two when the connection is made between the two, a fixing signal indicating whether the other relay is in a fixing state is output, and either one of them is turned off. When a control signal is input during a period from when the other is turned off to establish a conduction state between the two, when it is detected that a voltage is applied between the two, the one relay is It is preferable to output a sticking signal indicating whether the sticking state is present.

  According to this charging control device, when a control signal is input and the two are brought into a conductive state, when it is detected that a voltage is applied between the two, a sticking signal is output. By not inputting a control signal to the voltage detection circuit during the charging period, it is possible to prevent the two from being in a conductive state and affecting the charging.

  A method for detecting relay sticking of a charging control device according to the present invention includes an L-phase line and an N-phase line provided between a power source and a charging target, a first relay provided on the L-phase line, and the N-phase line. And a voltage detection circuit that is arranged between the L-phase line and the N-phase line and detects whether or not a voltage is applied between the first relay and the second relay. An on-control process for detecting the adhering state of a charge control device that performs on / off control of a relay, wherein at least one of the first relay and the second relay is turned on a predetermined time before the other at the start of charging; An off control step of turning off either one of the other at a specified time before the other at the end of charging; and from turning on either of the one in the on control step to turning on the other In the period, when the voltage detection circuit detects that a voltage is applied between the two, the first determination step of determining that the other relay is in a fixed state, When one of the relays is turned off and the other is turned off, the voltage detection circuit detects that a voltage is applied between the two and determines that the one relay is fixed. And a second determination step.

  According to the relay sticking detection method of the charging control device according to the present invention, it is detected by the voltage detection circuit that a voltage is applied between the two in the period from when one is turned on until the other is turned on. In this case, it is determined that the other relay is fixed. Here, when one is turned on and the other is in a fixed state, it is detected by the voltage detection circuit that a voltage is applied between the two, so that it is determined that the other relay is in a fixed state. Can do. Further, when it is detected by the voltage detection circuit that a voltage is applied between the two in the period from when either one is turned off to when the other is turned off, it is determined that one of the relays is fixed. . Here, when the other is turned on and one is fixed, it is detected by the voltage detection circuit that a voltage is applied between the two, and therefore it is determined that the other relay is fixed. Can do. In addition, one of the relays is turned on at a predetermined time before the other at the start of charging and turned off at a specified time before the other at the end of the charging. Therefore, it is not necessary to perform on / off control of the relay only for sticking detection, and sticking can be detected. Therefore, the number of relay operations can be reduced and the fixed relay can be specified.

  ADVANTAGE OF THE INVENTION According to this invention, the charge control apparatus which can identify the relay which has restrained the number of relay operation | movements, and can adhere can be provided.

It is a circuit diagram which shows the outline of the charge control apparatus which concerns on embodiment of this invention. It is a functional block diagram which shows the detail of the microcomputer shown in FIG. FIG. 2 is a circuit diagram showing details of a voltage detection circuit shown in FIG. 1. It is a timing chart which shows the relay sticking detection method of the charge control device concerning this embodiment, (a) shows operation at the time of normal, (b) shows operation at the time of N phase fixation, and (c) is L phase. The operation at the time of fixation is shown.

  Hereinafter, the present invention will be described according to a preferred embodiment, but the present invention is not limited to the embodiment shown below, and can be appropriately changed without departing from the gist of the present invention.

  FIG. 1 is a circuit diagram showing an outline of a charge control device according to an embodiment of the present invention. A charging control device 1 shown in FIG. 1 is built in a charging connector side device provided in a table lamp, for example, and supplies AC power from a trademark AC power source to a vehicle battery (an example of a charging target). It is. The AC power supply is usually an L-phase and N-phase two-phase AC.

  Such a charging control device 1 includes an L-phase line L1 and an N-phase line L2 provided between the AC power source and the charging target, a first relay 11 provided on the L-phase line L1, and an N-phase line L2. The second relay 12 is provided, and the AC power is supplied to the charging target side when both the relays 11 and 12 are turned on.

  In addition, the charging control device 1 includes a microcomputer 20 and a voltage detection circuit 30. When the microcomputer 20 receives the charging permission signal CPLT transmitted from the vehicle side, the microcomputer 20 turns on both the relays 11 and 12 to supply AC power to charge the vehicle battery. The microcomputer 20 has a function as shown in FIG.

  FIG. 2 is a functional block diagram showing details of the microcomputer 20 shown in FIG. As shown in FIG. 2, the microcomputer 20 includes an on / off control unit (on / off control unit) 21, a control signal output unit 22, and an adhesion determination unit (adhesion determination unit) 23.

  The on / off control unit 21 turns on the first relay (any one) 11 at a predetermined time before the second relay (the other) 12 at the start of charging, and turns the first relay 11 over the second relay 12 at the end of charging. On / off control is performed to turn off only a predetermined time. In other words, when the charging permission signal CPLT transmitted from the vehicle side is input, the on / off control unit 21 controls the first relay 11 to be turned on after the first predetermined time has elapsed from the input time, and further to the second predetermined time from the on control time. After the elapse of time, the second relay 12 is turned on. The on / off control unit 21 controls the second relay 12 to be turned off before the first specified time from the time when the input of the charge permission signal CPLT ends, and the first relay further before the second specified time from the time of the off control. 11 is turned off.

  Thus, since the on / off control unit 21 performs on / off control of both the relays 11 and 12, charging is performed in a period from when the second relay 12 is turned on until the first relay 11 is turned off. (However, when there is no sticking). Note that the timing at which the charge permission signal CPLT is turned off can be obtained from, for example, a prediction calculation until full charge or a case where a charge time is specified (predetermined time).

  The control signal output unit 22 outputs a control signal AC_EN to the voltage detection circuit 30. The voltage detection circuit 30 shown in FIG. 1 is arranged between the L-phase line L1 and the N-phase line L2 (on the charging target side from both the relays 11 and 12), and between them (that is, the L-phase line L1 and the N-phase). The presence / absence of voltage application between the line L2 and the line L2 is detected. Only when the control signal AC_EN from the control signal output unit 22 is input, the voltage detection circuit 30 makes the connection between them and detects the presence or absence of voltage application.

  In the first period TE1 from when the first relay 11 is turned on by the on / off control unit 21 to when the second relay 12 is turned on, the adhesion determination unit 23 is applied with a voltage between the two by the voltage detection circuit 30. When it is detected that the second relay 12 is in a locked state, it is determined that the second relay 12 is in a fixed state. In addition, the sticking determination unit 23 is configured such that a voltage is detected between the two by the voltage detection circuit 30 in the second period TE2 from when the first relay 11 is turned off by the on / off control unit 21 to when the second relay 12 is turned off. When it is detected that the voltage is applied, it is determined that the first relay 11 is in a fixed state.

  Here, when the voltage detection circuit 30 detects that a voltage is applied between the two when the control signal AC_EN is input during the periods TE1 and TE2 and the two are in the conductive state, the voltage detection circuit AC_ON is output. Output. In more detail, the fixation signal AC_ON output from the voltage detection circuit 30 in the first period TE1 indicates that the second relay 12 is in the fixation state. That is, in the first period TE1, when there is no relay sticking, the first relay 11 is turned on and the second relay 12 is turned off. For this reason, when the sticking signal AC_ON is output, it can be said that the second relay 12 is in the sticking state. On the other hand, the fixing signal AC_ON output from the voltage detection circuit 30 in the second period TE2 indicates that the first relay 11 is in the fixing state. That is, in the second period TE2, when there is no relay sticking, the first relay 11 is turned off and the second relay 12 is turned on. For this reason, when the fixing signal AC_ON is output, it can be said that the first relay 11 is in the fixing state.

  Therefore, the sticking determination unit 23 sticks to the first relay 11 or the second relay 12 based on whether or not the sticking signal AC_ON is input and which period TE1 or TE2 is currently. It will be possible to judge whether or not.

  FIG. 3 is a circuit diagram showing details of the voltage detection circuit 30 shown in FIG. As shown in FIG. 3, the voltage detection circuit 30 includes an optical MOSFET 31 and a photocoupler 32. The optical MOSFET 31 includes a light emitting unit 31a and a light receiving unit 31b, and the light emitting unit 31a includes a light emitting diode that emits light when the control signal AC_EN output from the microcomputer 20 is input during the above-described periods TE1 and TE2. . When the light emitting unit 31a emits light, the light receiving unit 31b is turned on. The light receiving unit 31b has one terminal connected to the photocoupler 32 and the other terminal connected to the N-phase line L2.

  The photocoupler 32 includes two light emitting units 32a1 and 32a2 and a light receiving unit 32b. The two light emitting units 32a1 and 32a2 are configured by light emitting diodes connected in reverse parallel to each other, and one end is connected to the L-phase line L1 and the other end is connected to the light receiving unit 31b of the optical MOSFET 31. For this reason, in a state where one of the first and second relays 11 and 12 is fixed, if the light receiving unit 31b of the optical MOSFET 31 is turned on during the period TE1 or TE2, whichever of the two light emitting units 32a1 and 32a2 is turned on. One of them emits light, and the phototransistor serving as the light receiving portion 32b is turned on. As a result, the fixation signal AC_ON is output to the microcomputer 20.

  Next, the relay sticking detection method of the charging control apparatus 1 according to the present embodiment will be described. FIG. 4 is a timing chart showing a method for detecting the relay sticking of the charging control device 1 according to the present embodiment, where (a) shows the operation at the normal time, (b) shows the operation at the N-phase sticking, c) shows the operation when the L phase is fixed.

  As shown to Fig.4 (a), when the 1st and 2nd relays 11 and 12 do not adhere, the charging control apparatus 1 operate | moves as follows. First, at time t1, the charging permission signal CPLT is input to the microcomputer 20. That is, charge permission signal CPLT changes from H level to L level. Then, at the time t2 when the first predetermined time has elapsed from the time t1, the on / off control unit 21 controls the first relay 11 to be on. Next, the on / off control unit 21 controls the second relay 12 to be on at time t4 when the second predetermined time has elapsed from time t2.

  Further, at time t3 in the period TE1 from time t2 to time t4, the control signal output unit 22 outputs the control signal AC_EN. Here, in the period TE1, the first relay 11 is on, but the second relay 12 is off. For this reason, the sticking signal AC_ON is not output. For this reason, the sticking determination unit 23 determines that the second relay 12 is not sticking. Then, charging of the vehicle battery starts from time t4.

  Here, when the charging permission signal CPLT is input, the microcomputer 20 calculates a time point when the input ends. That is, the time t8 when the charge permission signal CPLT changes from the L level to the H level is calculated. The microcomputer 20 calculates a time t7 before the first specified time from the time t8, and calculates a time t5 before the second specified time from the time t7.

  Next, at time t5, the on / off control unit 21 controls the first relay 11 to be turned off. Thereby, the charging period to the vehicle battery ends. After that, at time t7, the on / off control unit 21 controls the second relay 12 to be turned off.

  Further, at time t6 in the period TE2 from time t5 to time t7, the control signal output unit 22 outputs the control signal AC_EN. Here, in the period TE2, the second relay 12 is on, but the first relay 11 is off. For this reason, the sticking signal AC_ON is not output. For this reason, the sticking determination unit 23 determines that the first relay 11 is not stuck. At time t8, charging permission signal CPLT changes from the L level to the H level, and the operation ends.

  Next, as shown in FIG. 4B, when the second relay 12 is fixed, the charging control device 1 operates as follows. In FIG. 4B, since the second relay 12 is fixed, the N-phase voltage is in the voltage state indicated by the broken line.

  First, at time t1, the charging permission signal CPLT is input to the microcomputer 20, and at time t2 when the first predetermined time has elapsed from time t1, the on / off control unit 21 turns on the first relay 11. Next, the on / off control unit 21 controls the second relay 12 to be on at time t4 when the second predetermined time has elapsed from time t2.

  Further, at time t3 in the period TE1 from time t2 to time t4, the control signal output unit 22 outputs the control signal AC_EN. Here, in the period TE1, since the second relay 12 is fixed, both the relays 11 and 12 are in the on state. Therefore, the sticking signal AC_ON is output at time t3. The sticking determination unit 23 receives the sticking signal AC_ON and determines that the second relay 12 is stuck.

  After time t5, it is the same as that shown in FIG. 4A. However, since the second relay 12 is fixed, it is assumed that the on / off control unit 21 controls the second relay 12 to be off at time t7. However, the N-phase voltage is indicated by a broken line.

  Next, as shown in FIG. 4C, when the first relay 11 is fixed, the charging control device 1 operates as follows. In FIG. 4C, since the first relay 11 is fixed, the L-phase voltage is in a voltage state indicated by a broken line.

  First, the times t1 to t4 are the same as those shown in FIG. 4A. However, since the first relay 11 is fixed, the on / off control unit 21 controls the first relay 11 at the time t2. The N-phase voltage is shown by a broken line before the operation.

  At time t5, the on / off control unit 21 controls the first relay 11 to be turned off. After that, at time t7, the on / off control unit 21 controls the second relay 12 to be turned off.

  Further, at time t6 in the period TE2 from time t5 to time t7, the control signal output unit 22 outputs the control signal AC_EN. Here, in the period TE2, since the first relay 11 is fixed, both the relays 11 and 12 are in the on state. Therefore, the fixation signal AC_ON is output at time t6. The sticking determination unit 23 receives the sticking signal AC_ON and determines that the first relay 11 is stuck. At time t8, charging permission signal CPLT changes from the L level to the H level, and the operation ends.

  Thus, according to the charging control device 1 according to the present embodiment, the voltage detection circuit 30 causes the voltage detection circuit 30 to intervene between the first relay 11 and the second relay 12 after the first relay 11 is turned on. When it is detected that a voltage is applied, it is determined that the second relay 12 is in a fixed state. Here, when the first relay 11 is turned on and the second relay 12 is in a fixed state, the voltage detection circuit 30 detects that a voltage is being applied between the two, so that the second relay 12 is It can be determined that the state is fixed. Further, when the voltage detection circuit 30 detects that a voltage is applied between the first relay 11 and the second relay 12 after the first relay 11 is turned off, the first relay is detected. 11 is determined to be in a fixed state. Here, when the second relay 12 is turned on and the first relay 11 is in the fixed state, the voltage detection circuit 30 detects that a voltage is applied between the two, so the second relay 12 It can be determined that the state is fixed. In addition, the first relay 11 is turned on for a predetermined time before the second relay 12 at the start of charging, and the first relay 11 is turned off for a predetermined time before the second relay 12 at the end of charging. The period during which the relay 11 is turned on is shifted slightly ahead of the period during which the second relay 12 is turned on, and it is not necessary to perform on / off control of the relays 11 and 12 only to detect the sticking, and the sticking can be detected. . Therefore, the number of relay operations can be reduced and the fixed relay can be specified.

  In addition, when the control signal AC_EN is input and the two are made conductive, when it is detected that a voltage is applied between the two, the sticking signal AC_ON is output. By not inputting the control signal AC_EN to the voltage detection circuit 30, it is possible to prevent a situation in which the two are not brought into conduction and affect charging.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention.

  For example, in the above embodiment, the voltage detection circuit 30 transmits the fixation signal AC_ON when the fixation occurs. However, the voltage detection circuit 30 is not limited to this, and the voltage detection circuit 30 is simply configured by a voltmeter, and the detected voltage signal is input to the microcomputer 20. You may come to let me.

1: Charge control device 11: First relay (one relay)
12: Second relay (the other relay)
20: Microcomputer 21: On / off control unit (on / off control means)
22: Control signal output unit 23: Adhesion determination unit (adhesion determination means)
30: Voltage detection circuit 31: Optical MOSFET
31a: Light emitting unit 31b: Light receiving unit 32: Photocoupler 32a1, 32a2: Light emitting unit 32b: Light receiving unit AC_EN: Control signal AC_ON: Fixing signal CPLT: Charging permission signal L1: L phase line L2: N phase line TE1, TE2: Period

Claims (3)

An L-phase line and an N-phase line provided between the power source and the charging target;
A first relay provided on the L-phase line, and a second relay provided on the N-phase line;
A voltage detection circuit that is arranged between the L-phase line and the N-phase line and detects the presence or absence of voltage application between the two;
The first relay and the second relay are controlled to be turned on / off, and at the start of charging, one of the first relay and the second relay is turned on for a predetermined time before the other, and at the end of charging, On / off control means for turning off one of the other before a specified time;
The other relay when the voltage detection circuit detects that a voltage is applied between the two in the period from when either one is turned on by the on / off control means to when the other is turned on Is determined to be in a fixed state, and when it is detected by the voltage detection circuit that a voltage is applied between the two in the period from when either one is turned off to the other, Adherence determining means for determining that the one relay is in an adhering state;
A charge control device comprising: The voltage detection circuit is configured such that when the on / off control means inputs a control signal in a period from when one of the one is turned on to when the other is turned on, the two are turned on. When it is detected that a voltage is applied between them, a fixed signal indicating whether the other relay is in a fixed state is output, and a period from turning off one of the two to turning off the other When a control signal is input and the two are made conductive, when it is detected that a voltage is applied between the two, a fixed signal indicating whether the one relay is fixed is output. The charge control device according to claim 1, wherein: An L-phase line and an N-phase line provided between a power source and a charging target, a first relay provided on the L-phase line, a second relay provided on the N-phase line, the L-phase line, and A relay detection detection method for a charging control device, which is disposed between the N-phase lines and includes a voltage detection circuit for detecting whether or not a voltage is applied between the two and which controls on / off of the first relay and the second relay. Because
An on control step of turning on one of the first relay and the second relay at a predetermined time before the other at the start of charging;
An off control step of turning off any one of the above by a specified time before the other at the end of charging;
When the voltage detection circuit detects that a voltage is applied between the two in the period from turning on one of the ones to turning on the other in the on control step, the other relay A first determination step of determining that is in a fixed state;
The one relay when the voltage detection circuit detects that a voltage is applied between the two in the period from the time when either one is turned off to the time when the other is turned off in the off control step. A second determination step of determining that is in a fixed state;
A relay adhering detection method for a charging control device.

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