JP2012161123A - Electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide electronic equipment which can minimize an information amount transmitted from a controller to a control circuit and appropriately control a switching element depending on a property with a simple structure.SOLUTION: A control apparatus 12 comprises a control circuit 124 and a controller 125. The controller 125 calculates a clamping voltage and a time limit based on stored on/off threshold voltages and a detected temperature. The controller 125 obtains identification information corresponding to the calculated clamping voltage and the time limit, based on stored combination information of the clamping voltage and the time limit and a table of identification information. The control circuit 124 calculates a clamping voltage and a time limit based on the stored combination information of the clamping voltage and the time limit, the table of the identification information and the identification information output from the controller 125. Multiple pieces of information can be converted to corresponding one piece of information. As a result, an amount of information transmitted from the controller to the control circuit can be minimized. Accordingly, a switching element can be appropriately controlled depending on a property with a simple structure.

Description

  The present invention relates to an electronic device including a switching element and a drive circuit.

  Conventionally, as an electronic device including a switching element and a drive circuit, for example, there is a gate drive circuit disclosed in Patent Document 1.

  The gate drive circuit disclosed in Patent Document 1 is a circuit that drives a power switching element. The gate drive circuit includes a first on-side power supply circuit and a second on-side power supply circuit. The first on-side power supply circuit includes a first on-power supply and a first switch. The second on-side power supply circuit includes a second on-power supply, a second switch, and an on-side delay circuit. The first on-voltage supplied by the first on-power supply is set lower than the second on-voltage supplied by the second on-power supply.

  When a signal instructing to turn on the power switching element is input, the first switch is turned on, and the first on voltage of the first on power supply is applied to the gate of the power switching element. A signal instructing to turn on the power switching element is delayed by the on-side delay circuit. When the signal delayed by the on-side delay circuit is input, the second switch is turned on, and the second on-voltage of the second on-power supply is applied to the gate of the power switching element. That is, during the ON operation of the power switching element, the first ON voltage set to be low is applied to the gate, and when the power switching element is in a steady state, the second ON voltage set to be high is applied to the gate.

  By reducing the gate voltage during the ON operation of the power switching element, the collector current flowing through the power switching element can be suppressed. Therefore, even when an abnormality occurs and the power switching element is turned off, damage due to surge voltage or damage due to heat generation can be suppressed. Accordingly, it is possible to improve the resistance to damage of the power switching element. Further, when the power switching element is in a steady state, the steady loss of the power switching element can be suppressed by increasing the gate voltage.

  By the way, this gate drive circuit includes two power supplies having different voltages. Therefore, there is a problem that the circuit configuration becomes complicated.

  Further, the power switching element has a variation in characteristics. Therefore, in order to appropriately control the power switching element, the delay time of the on-side delay circuit, the first on-voltage of the first on-power supply, and the second on-voltage of the second on-power supply must be set according to the characteristics. Don't be. However, the delay time, the first on-voltage, and the second on-voltage are set by hardware. Therefore, the setting cannot be changed according to the characteristics of the power switching element. Therefore, there is a problem that the power switching element cannot be appropriately controlled according to the characteristics.

JP 2009-071956 A

  On the other hand, an electronic device that can appropriately control a switching element according to characteristics with a simple configuration has been proposed.

  The electronic device includes a constant current circuit, a voltage limiting circuit, a controller, and a control circuit. The controller outputs a drive signal and obtains and outputs control information for controlling the voltage limiting circuit based on characteristic information of the switching element stored in advance. When the drive signal instructs the switching element to turn on, the control circuit controls the constant current circuit to flow a constant current into the control terminal of the switching element, and controls the voltage limiting circuit based on the control information to control the switching element. Limit terminal voltage.

  Therefore, the voltage applied to the control terminal of the switching element can be adjusted by the constant current circuit and the voltage limiting circuit without using two power supplies as in the gate drive circuit described above. Therefore, the circuit configuration can be simplified. Further, since the voltage limiting circuit is controlled based on the characteristic information of the switching element stored in advance, the switching element can be appropriately controlled according to the characteristic.

  However, this electronic device must also send control information in addition to drive signals from the controller to the control circuit. When there is a plurality of control information, there is a problem that the circuit configuration becomes complicated.

  The present invention has been made in view of such circumstances, and provides an electronic device capable of appropriately controlling a switching element in accordance with characteristics with a simple configuration while suppressing the amount of information sent from a controller to a control circuit. The purpose is to do.

  Therefore, as a result of intensive research and trial and error to solve this problem, the present inventors provide combination information configured as combinations of a plurality of control information values stored for each combination information. And determining the corresponding identification information from the obtained plurality of control information based on the identification information for identifying the combination information, and suppressing the information sent from the controller to the control circuit, with a simple configuration and according to the characteristics The inventors have found that the switching element can be appropriately controlled, and have completed the present invention.

  That is, the electronic device according to claim 1 controls the switching element, a drive circuit connected to the switching element and driving the switching element, a drive signal for instructing on / off of the switching element, and the drive circuit A controller for obtaining a plurality of control information for controlling, a control circuit connected to the drive circuit and the controller, controlling the drive circuit based on the plurality of control information, and driving the switching element based on the drive signal. The controller is based on stored combination information configured as a combination of values of a plurality of control information, and identification information that is provided for each combination information and identifies the combination information, The corresponding identification information is obtained and output from the obtained plurality of control information, and the control circuit stores the stored combination information and identification information, Based on the output identification information controller, and obtaining a plurality of control information.

  According to this configuration, a plurality of control information can be converted into corresponding identification information. That is, a plurality of pieces of information can be converted into one piece of corresponding information. Therefore, the amount of information sent from the controller to the control circuit can be suppressed. Therefore, the circuit configuration can be simplified as compared with the case where a plurality of pieces of information are sent in parallel or serial. Thereby, it is possible to appropriately control the switching element according to characteristics with a simple configuration.

  The electronic device according to claim 2, wherein the controller continuously outputs a pulse signal having a period corresponding to the identification information, and the control circuit outputs the identification information output by the controller based on the period of the pulse signal output by the controller. It is characterized by calculating | requiring. According to this configuration, a pulse signal having a period corresponding to the identification information is continuously output. Therefore, identification information can be confirmed many times. Therefore, erroneous recognition of identification information can be prevented.

  In the electronic device according to claim 3, the controller continuously outputs a pulse signal having a specified period corresponding to the identification information, and the control circuit has a period of the pulse signal output by the controller other than the specified period. In this case, the drive circuit is controlled based on a plurality of control information obtained previously. According to this configuration, the drive circuit can be controlled without being affected even if the period of the pulse signal changes other than the period temporarily designated by noise.

  The electronic device according to claim 4 is characterized in that the control circuit outputs an abnormal signal when the cycle of the pulse signal output from the controller is other than a specified cycle continuously for a predetermined time or more. . According to this configuration, an abnormality of the controller can be notified.

  The electronic device according to claim 5, wherein when the identification information obtained based on the pulse signal output from the controller is different from the stored identification information, a plurality of stored initial setting control information The drive circuit is controlled based on the above. According to this configuration, even in an abnormal state where the combination information and identification information stored in the control circuit are erased, the drive circuit can be controlled based on a plurality of control information for initial setting.

The electronic apparatus according to claim 6 is characterized in that the controller outputs the identification information when the output of the drive signal is stopped. According to this configuration, when the output of the drive signal is stopped, the driving of the switching element is also stopped. Therefore, no noise is generated with the driving of the switching element. Therefore, identification information can be sent from the controller to the control circuit without being affected by noise.

The electronic device according to claim 7 is characterized in that the controller outputs a drive signal to the control circuit via the drive signal line and outputs identification information to the control circuit via the drive signal line. According to this configuration, there is no need to separately provide a signal line for sending identification information. Therefore, the circuit configuration can be further simplified.

It is a circuit diagram of the motor control device in a 1st embodiment. It is a circuit diagram of the control apparatus in FIG. It is explanatory drawing for demonstrating the relationship between the combination information comprised as a combination of the value of several control information, and the identification information which identifies combination information. It is explanatory drawing for demonstrating the relationship between identification information and the pulse signal which a controller outputs. It is a circuit diagram of the control apparatus in 2nd Embodiment.

  Next, an embodiment is given and this invention is demonstrated in detail. In the present embodiment, an example in which an electronic device according to the present invention is mounted on a vehicle and applied to a motor control device that controls a vehicle driving motor will be described.

(First embodiment)
First, the configuration of the motor control device of the first embodiment will be described with reference to FIG. Here, FIG. 1 is a circuit diagram of the motor control device according to the first embodiment.

  The motor control device 1 (electronic device) shown in FIG. 1 converts a DC high voltage (for example, 288V) output from a high voltage battery B1 insulated from the vehicle body into a three-phase AC voltage and supplies it to the vehicle drive motor M1. This is a device for controlling the vehicle drive motor M1. The motor control device 1 includes a smoothing capacitor 10, an inverter device 11, and a control device 12.

  The smoothing capacitor 10 is an element for smoothing the DC high voltage of the high voltage battery B1. One end of the smoothing capacitor 10 is connected to the positive terminal of the high voltage battery B1. The other end is connected to the negative terminal of the high voltage battery B1. Furthermore, the negative terminal of the high voltage battery B1 is connected to the ground for the high voltage battery insulated from the vehicle body.

  The inverter device 11 is a device that converts the DC voltage smoothed by the smoothing capacitor 10 into a three-phase AC voltage and supplies it to the vehicle drive motor M1. The inverter device 11 includes IGBTs 110a to 110f (switching elements).

  The IGBTs 110a to 110f are switching elements that are driven by controlling the voltage of the gate (control terminal) and convert the DC voltage smoothed by the smoothing capacitor 10 by turning on and off to a three-phase AC voltage. . The IGBTs 110a and 110d, the IGBTs 110b and 110e, and the IGBTs 110c and 110f are respectively connected in series. Specifically, the emitters of the IGBTs 110a to 110c are connected to the collectors of the IGBTs 110d to 110f, respectively. Three sets of IGBTs 110a and 110d, IGBTs 110b and 110e, and IGBTs 110c and 110f connected in series are connected in parallel. The collectors of the IGBTs 110 a to 110 c are connected to one end of the smoothing capacitor 10, and the emitters of the IGBTs 110 d to 110 f are connected to the other end of the smoothing capacitor 10. The gates and emitters of the IGBTs 110a to 110f are connected to the control device 12, respectively. Further, the series connection points of the IGBTs 110a and 110d, the IGBTs 110b and 110e, and the IGBTs 110c and 110f that are connected in series are respectively connected to the vehicle drive motor M1.

  The control device 12 is a device that controls the IGBTs 110a to 110f. The control device 12 is connected to the gates and emitters of the IGBTs 110a to 110f, respectively.

  Next, the control device will be described in detail with reference to FIGS. Here, FIG. 2 is a circuit diagram of the control device in FIG. Specifically, it is a circuit diagram showing a circuit portion for one IGBT. FIG. 3 is an explanatory diagram for explaining a relationship between combination information configured as a combination of a plurality of control information values and identification information for identifying the combination information. FIG. 4 is an explanatory diagram for explaining the relationship between the identification information and the pulse signal output from the controller.

  As shown in FIG. 2, the control device 12 controls the IGBT 110d with a drive power supply circuit 120, an on-drive constant current circuit 121 (drive circuit), an off-drive circuit 122 (drive circuit), and a voltage limit. A circuit 123 (drive circuit) and a control circuit 124 are provided. Moreover, the controller 125 is provided with respect to IGBT110a-110f. Similarly to the other IGBTs 110a to 110c, 110e, and 110f, the control device 12 similarly includes a drive power supply circuit, an on-drive constant current circuit, an off-drive circuit, a voltage limiting circuit, and a control circuit. And.

  The drive power supply circuit 120 is a circuit that supplies a voltage for driving the IGBT 110d. The driving power supply circuit 120 stabilizes and outputs the voltage supplied from the power supply circuit (not shown). The input terminal of the driving power supply circuit 120 is connected to the power supply circuit. The positive terminal is connected to the on-drive constant current circuit 121. Furthermore, the negative electrode terminal is connected to the ground for the high voltage battery insulated from the vehicle body, and is connected to the emitter of the IGBT 110d through the ground for the high voltage battery.

  The on-drive constant current circuit 121 is a circuit for turning on the IGBT 110d. Specifically, a circuit that turns on the IGBT 110d by charging a constant constant current into the gate of the IGBT 110d based on an instruction from the control circuit 124 to charge the charge, turning the gate voltage higher than the off threshold voltage, and turning on the IGBT 110d. is there. The on-drive constant current circuit 121 includes a constant current source 121a and a switch 121b.

  The constant current source 121a is a circuit that outputs a constant constant current. The power terminal of the constant current source 121a is connected to the positive terminal of the driving power circuit 120. The output terminal is connected to the switch 121b.

  The switch 121b is an element for connecting the constant current source 121a to the gate of the IGBT 110d based on an instruction from the control circuit 124. One end of the switch 121b is connected to the output terminal of the constant current source 121a. The other end is connected to the gate of the IGBT 110d. Further, the control terminal is connected to the control circuit 124.

  The off drive circuit 122 is a circuit for turning off the IGBT 110d. Specifically, it is a circuit that discharges electric charges from the gate of the IGBT 110d, turns the gate voltage lower than an on / off threshold voltage, and turns off the IGBT 110d. The off drive circuit 122 includes an off drive FET 122a and an off drive resistor 122b.

  The off-drive FET 122a is a switching element that is driven by controlling the voltage of the gate, and discharges electric charges from the gate of the IGBT 110d when turned on. Specifically, it is an N-channel MOSFET. The source of the off drive FET 122a is connected to the ground for the high voltage battery insulated from the vehicle body, and is connected to the negative terminal of the drive power supply circuit 120 and the emitter of the IGBT 110d via the ground for the high voltage battery. The drain is connected to the gate of the IGBT 110d through the off-drive resistor 122b. Further, the gate is connected to the control circuit 124.

  The voltage limiting circuit 123 is a circuit for limiting the gate voltage of the IGBT 110d. Specifically, this is a circuit that limits the gate voltage of the IGBT 110d to a predetermined limit voltage indicated by the control circuit 124 for a predetermined limit time indicated by the control circuit 124. The voltage limiting circuit 123 includes a clamp circuit 123a and a switch 123b.

  The clamp circuit 123 a is a circuit that limits the voltage of the connected terminal to a predetermined limit voltage indicated by the control circuit 124. One end of the clamp circuit 123a is connected to the gate of the IGBT 110d. The other end is connected to the switch 123b. Further, the control terminal is connected to the control circuit 124.

  The switch 123b is an element for connecting the clamp circuit 123a to the gate of the IGBT 110d based on an instruction from the control circuit 124 for a predetermined time limit indicated by the control circuit 124. One end of the switch 123b is connected to the other end of the clamp circuit 123a. The other end is connected to the ground for the high voltage battery insulated from the vehicle body, and is connected to the negative terminal of the drive power supply circuit 120 and the emitter of the IGBT 110d via the ground for the high voltage battery. Further, the control terminal is connected to the control circuit 124.

  The control circuit 124 obtains identification information based on the period of the pulse signal output as identification information by the controller 125, and stores the combination information configured as a combination of a plurality of control information values stored for each combination information. This is a circuit for obtaining a plurality of control information from the identification information output from the controller 125 based on the identification information provided to identify the combination information. Further, based on the drive signal output from the controller 125 and a plurality of obtained control information, the on-drive constant current circuit 121, the voltage limiting circuit 123, and the off-drive circuit 122 are controlled to drive the IGBT 110d. It is also a circuit.

  When the cycle of the pulse signal output as identification information by the controller 125 is other than the specified cycle, the control circuit 124, based on a plurality of previously obtained control information, The off drive circuit 122 and the voltage limiting circuit 123 are controlled. In addition, when the cycle of the pulse signal output as identification information by the controller 125 is other than a cycle that is continuously specified for a predetermined time or more, an abnormal signal is output. Further, when the obtained identification information is not in the combination information and identification information table of the plurality of control information, the on-drive constant current circuit 121 and the off-drive are based on the stored plurality of initial setting control information. Circuit 122 and voltage limiting circuit 123 are controlled. The control circuit 124 includes a memory 124a.

  The memory 124a is an element that stores a combination information of a plurality of control information, a table of identification information, an initial setting limit voltage, and a limit time. Specifically, it is a non-volatile memory. The memory 124a stores a table of combination information and identification information of limit voltage and time limit shown in FIG. 3 as a table of combination information and identification information of a plurality of control information. In addition, the initial setting limit voltage and the limit time used in the event of an abnormality are stored. The control circuit 124 is connected to the controller 125. Further, it is connected to the control terminal of the switch 121b. Further, it is connected to the gate of the off-drive FET 122a. In addition, it is connected to the gate of the IGBT 110d and to the control terminals of the clamp circuit 123a and the switch 123b.

  Here, the drive power supply circuit 120, the on-drive constant current circuit 121, the off-drive FET 122a, the voltage limiting circuit 123, and the control circuit 124 are integrally configured as an IC.

  The controller 125 is a circuit that generates and outputs a drive signal for turning on and off the IGBT 110d based on a command input from the outside. Further, it is a circuit for obtaining a plurality of control information for controlling the voltage limiting circuit 123 based on the stored characteristic information of the IGBT 110d and the detected temperature of the IGBT 110d. Further, the plurality of control information obtained based on the combination information stored as combinations of values of the plurality of control information and the identification information provided for each combination information for identifying the combination information. It is also a circuit that obtains the corresponding identification information from, and outputs a pulse signal with a specified period corresponding to the identification information. The controller 125 includes a memory 125a and a microcomputer 125b.

  The memory 125a is an element that stores characteristic information of the IGBT 110d and a table of combination information of a plurality of control information and identification information. Specifically, it is a non-volatile memory. The memory 125a stores, as characteristic information, the on / off threshold voltage of the IGBT 110d measured in advance when the assembly of the motor control device 1 is completed. In addition, as a table of combination information and identification information of a plurality of control information, a table of combination information and identification information of limit voltage and time limit shown in FIG. 3 is stored.

  The microcomputer 125b is an element that generates and outputs a drive signal based on an externally input command. It is also an element for obtaining a limit voltage and a limit time based on the on / off threshold voltage stored in the memory 125a and the detected temperature of the IGBT 110d. Further, the identification information shown in FIG. 4 is obtained by obtaining corresponding identification information from the obtained limit voltage and time limit based on the table of combination information and identification information of the limit voltage and time limit shown in FIG. 3 stored in the memory 125a. It is also an element that continuously outputs a pulse signal having a specified period according to information. The bus of the microcomputer 125b is connected to the memory 125b. The drive signal output terminal is connected to the drive signal input terminal of the control circuit 124 via the photocoupler 126a. Further, the control information output terminal is connected to the control information input terminal of the control circuit 124 via the photocoupler 126b.

  Next, the operation of the motor control device will be described with reference to FIG. When the ignition switch (not shown) of the vehicle is turned on, the motor control device 1 shown in FIG. 1 starts its operation. The DC high voltage of the high voltage battery B1 is smoothed by the smoothing capacitor 10. The control device 12 controls the IGBTs 110a to 110f configuring the inverter device 11 based on a command input from the outside. Specifically, the IGBTs 110a to 110f are turned on and off at a predetermined cycle. The inverter device 11 converts the DC high voltage smoothed by the smoothing capacitor 10 into a three-phase AC voltage and supplies it to the vehicle drive motor M1. In this way, the motor control device 1 controls the vehicle drive motor M1.

  Next, the driving operation of the IGBT will be described with reference to FIG. The microcomputer 125b shown in FIG. 2 obtains the limit voltage and limit time of the voltage limit circuit 123 based on the on / off threshold voltage of the IGBT 110d stored in the memory 125a and the detected temperature of the IGBT 110d. Then, based on the table of the combination information and the identification information of the limit voltage and the limit time shown in FIG. 3 stored in the memory 125a, the corresponding identification information is obtained from the obtained limit voltage and the limit time, and shown in FIG. A pulse signal having a specified period corresponding to the identification information is continuously output.

  For example, as shown in FIG. 3, when the control information A related to the limit voltage is a1 and the control information B related to the limit time is b1, the corresponding identification information is X1, and the control circuit 124 identifies as shown in FIG. A pulse signal having a period T1 corresponding to the information X1 is output. Further, as shown in FIG. 3, when the control information A related to the limit voltage is a2 and the control information B related to the limit time is b2, the corresponding identification information is X2, and the control circuit 124 identifies as shown in FIG. A pulse signal having a period T2 (> T1) corresponding to the information X2 is output.

  The control circuit 125 obtains identification information based on the period of the pulse signal input via the photocoupler 126a. The limit voltage and the limit time are obtained based on the combination information of the limit voltage and the limit time and the identification information table shown in FIG. 3 and the obtained identification information stored in the memory 124a. Then, the clamp circuit 123a is controlled so that the gate voltage of the IGBT 110d is limited by the obtained limit voltage.

  After that, when the drive signal input via the photocoupler 126a instructs to turn on the IGBT 110d, the control circuit 124 turns on the switch 121b and turns off the off-drive FET 122a, and the gate of the IGBT 110d from the constant current source 121a. A constant current is supplied to the. As a result, the gate of the IGBT 110d is charged and the gate voltage increases.

  When the gate voltage reaches a predetermined voltage, the control circuit 124 turns on the switch 123b and starts limiting the gate voltage. When the gate voltage rises and exceeds the off threshold voltage, the IGBT 110d is turned on. When the IGBT 110d is turned on and the collector current flows, the voltage increase stops and the gate voltage becomes the mirror voltage. Thereafter, the gate voltage further increases, but is limited to the limit voltage by the voltage limit circuit 123. The control circuit 124 starts the limit of the gate voltage and then turns off the switch 123b after the determined limit time has elapsed to release the limit of the voltage. When the restriction on the voltage is released, the gate voltage rises to the voltage of the driving power supply circuit 120.

  That is, when the gate voltage exceeds the on / off threshold voltage and the IGBT is turned on, the gate voltage is limited to the limit voltage, and then the limit is released, and the gate voltage rises to the voltage of the driving power supply circuit. Therefore, similarly to the conventional case, even when an abnormality occurs and the IGBT 110d is turned off, damage due to surge voltage or damage due to heat generation can be suppressed. Accordingly, it is possible to improve the resistance to damage to the IGBT 110d. Further, when the IGBT 110d is in a steady state, the steady loss of the IGBT 110d can be suppressed by increasing the gate voltage.

  On the other hand, when the drive signal input through the photocoupler 126a instructs to turn off the IGBT 110d, the control circuit 124 stops the operation of the on-drive constant current circuit 121 and turns on the off-drive FET 122a. As a result, charges are discharged from the gate of the IGBT 110d via the off-drive resistor 122b. As a result, the gate voltage becomes lower than the on / off threshold voltage, and the IGBT 110d is turned off.

  When the cycle of the pulse signal output as identification information by the controller 125 is other than the specified cycles T1, T2, and T3 shown in FIG. 4, the control circuit 124 determines the previously set limit voltage and limit time. The on-drive constant current circuit 121, the off-drive circuit 122, and the voltage limiting circuit 123 are controlled based on the above. In addition, when the period of the pulse signal output as identification information by the controller 125 is other than the specified periods T1, T2, and T3 continuously for a predetermined time or more, an abnormal signal is output. Further, if the obtained identification information is not stored in the table of the combination information of the limit voltage and the limit time and the identification information shown in FIG. 3 stored in the memory 124a, that is, different from the identification information of the table, the memory 124a The on-drive constant current circuit 121, the off-drive circuit 122, and the voltage limit circuit 123 are controlled based on the stored initial setting limit voltage and limit time.

  Next, the effect will be described. According to the first embodiment, the limit voltage and the limit time can be converted into corresponding identification information. That is, a plurality of control information can be converted into one corresponding identification information. Therefore, the amount of information sent from the controller 125 to the control circuit 124 can be suppressed. Therefore, the circuit configuration can be simplified as compared with the case where a plurality of control information is sent in parallel or serial. Thereby, it is possible to appropriately control the IGBT 110d according to the characteristics with a simple configuration.

  According to the first embodiment, the controller 125 continuously outputs a pulse signal having a period corresponding to the identification information. Therefore, identification information can be confirmed many times. Therefore, erroneous recognition of identification information can be prevented.

  According to the first embodiment, the control circuit 124 obtains a previous calculation when the cycle of the pulse signal output as identification information by the controller 125 is other than the specified cycles T1, T2, and T3 shown in FIG. Based on the limit voltage and the limit time, the on-drive constant current circuit 121, the off-drive circuit 122, and the voltage limit circuit 123 are controlled. Therefore, even if the period of the pulse signal changes to a period other than the period temporarily specified by noise, the on-drive constant current circuit 121, the off-drive circuit 122, and the voltage limiting circuit are not affected by the change. 123 is controlled.

  According to the first embodiment, the control circuit 124 detects an abnormal signal when the cycle of the pulse signal output as identification information by the controller 125 is other than the cycles T1, T2, and T3 that are continuously specified for a predetermined time or more. Is output. Therefore, the abnormality of the controller 125 can be notified.

  According to the first embodiment, the control circuit 125 determines that the obtained identification information is not stored in the memory 124a when it is not in the table of combination information and identification information of the voltage limit and time limit shown in FIG. The on-drive constant current circuit 121, the off-drive circuit 122, and the voltage limit circuit 123 are controlled based on the initial setting limit voltage and the limit time stored in FIG. Therefore, even in an abnormal state in which the combination information and identification information stored in the control circuit 124 are erased, the on-drive constant current circuit 121 and the off-drive circuit are based on the initial setting limit voltage and limit time. 122 and the voltage limiting circuit 123 can be controlled.

(Second Embodiment)
Next, the motor control device of the second embodiment will be described. The motor control device according to the second embodiment is different from the motor control device according to the first embodiment that sends a drive signal and identification information independently via different signal lines. The timing for sending and the timing for sending the identification information are adjusted, and the drive signal and the identification information are sent on a common signal line.

  First, the configuration and operation of the control device will be described with reference to FIG. Here, FIG. 5 is a circuit diagram of the control device in the second embodiment. Here, a different part from the control apparatus of 1st Embodiment is demonstrated, and description is abbreviate | omitted except a required part about a common part.

  As shown in FIG. 4, the control device 22 has a drive power supply circuit 220, an on-drive constant current circuit 221, an off-drive circuit 222, a voltage limiting circuit 223, and a control circuit 224 with respect to the IGBT 210 d. And a controller 225. The IGBT 210d corresponds to the IGBT 110d of the first embodiment. The drive power supply circuit 220, the on-drive constant current circuit 221, the off-drive circuit 222, the voltage limiting circuit 223, and the control circuit 224 are the same as the drive power supply circuit 120, the on-drive constant current circuit 121, and the off-drive circuit of the first embodiment. The driving circuit 122, the voltage limiting circuit 123, and the control circuit 124 have the same configuration.

  The controller 225 includes a memory 225a and a microcomputer 225b.

  The memory 225a has the same configuration as the memory 125a of the first embodiment.

  The microcomputer 225b is an element that generates a drive signal based on a command input from the outside and outputs the drive signal to the control circuit 224 via the drive signal line 225c. In addition, this is an element for obtaining a limit voltage and a limit time based on the on / off threshold voltage stored in the memory 225a and the detected temperature of the IGBT 210d. Further, when the combination information of the limit voltage and the limit time stored in the memory 225a and the table of the identification information are obtained, the corresponding identification information is obtained from the obtained limit voltage and the limit time, and the output of the drive signal is stopped. And an element that outputs to the control circuit 224 via the drive signal line 225c. The drive signal output terminal of the microcomputer 225b is connected to the drive signal input terminal of the control circuit 224 via the drive signal line 225c. The control information output terminal is connected to the control information input terminal of the control circuit 224 via the drive signal line 225c.

  Since the operation is the same as that of the motor control device of the first embodiment except for the timing of sending the drive signal and the timing of sending the identification information, the description is omitted.

  Next, the effect will be described. According to the second embodiment, the controller 225 outputs identification information when the output of the drive signal is stopped. When the output of the drive signal is stopped, the driving of the IGBT 110d is also stopped. Therefore, noise does not occur with the driving of the IGBT 110d. Therefore, identification information can be sent from the controller 225 to the control circuit 224 without being affected by noise.

  According to the second embodiment, the controller 225 outputs a drive signal to the control circuit 224 via the drive signal line 225c and outputs identification information to the control circuit 224 via the drive signal line 225c. Therefore, it is not necessary to separately provide a signal line for sending identification information. Therefore, the circuit configuration can be further simplified.

DESCRIPTION OF SYMBOLS 1 ... Motor control apparatus (electronic device), 10 ... Smoothing capacitor, 11 ... Inverter apparatus, 110a-110d ... IGBT (switching element), 12, 22 ... Control apparatus, 120, 220 ... Power supply circuit for driving, 121, 221 ... Constant current circuit for driving (drive circuit), 121a, 221a ... Constant current source, 121b, 221b ... Switch, 122, 222 ... Off Driving circuit (driving circuit), 122a, 222a, off driving FET, 122b, 222b, off driving resistance, 123, 223, voltage limiting circuit (driving circuit), 123a, 223a, etc. Clamp circuit, 123b, 223b ... switch, 124, 224 ... control circuit, 125, 225 ... controller, 125a, 225a ... memo , 125b, 225b ··· microcomputer, 225c · · · drive signal lines, 126a, 126b, 226a ··· photocoupler, B1 · · · high-voltage battery, M1 · · · vehicle driving motor

Claims (7)

A switching element;
A driving circuit connected to the switching element and driving the switching element;
A controller for obtaining a drive signal for instructing on / off of the switching element and a plurality of control information for controlling the drive circuit;
A control circuit connected to the drive circuit and the controller, controlling the drive circuit based on a plurality of control information, and driving the switching element based on the drive signal;
An electronic device comprising:
Based on the stored combination information configured as a combination of values of a plurality of control information and identification information provided for each combination information for identifying the combination information, Find and output the corresponding identification information,
An electronic apparatus characterized in that the control circuit obtains a plurality of control information based on the stored combination information, identification information, and identification information output from the controller. The controller continuously outputs a pulse signal with a period according to the identification information,
The electronic device according to claim 1, wherein the control circuit obtains identification information output from the controller based on a period of a pulse signal output from the controller. The controller continuously outputs a pulse signal with a specified period according to the identification information,
3. The control circuit according to claim 2, wherein the control circuit controls the drive circuit based on a plurality of previously obtained control information when the period of the pulse signal output from the controller is other than the specified period. Electronic devices.   4. The electronic apparatus according to claim 3, wherein the control circuit outputs an abnormal signal when the cycle of the pulse signal output from the controller is other than a cycle that is continuously specified for a predetermined time or more.   When the identification information obtained based on the pulse signal output from the controller is different from the stored identification information, the control circuit controls the drive circuit based on the plurality of stored initial setting control information. The electronic device according to claim 1, wherein the electronic device is characterized in that:   The electronic device according to claim 1, wherein the controller outputs the identification information when the output of the drive signal is stopped.   The electronic device according to claim 6, wherein the controller outputs a drive signal to the control circuit via the drive signal line, and outputs identification information to the control circuit via the drive signal line.

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