JP2019163720A - Igniter, and vehicle including igniter - Google Patents

Abstract

To provide an igniter capable of suppressing disturbance of an ignition confirmation signal IGF by noise.SOLUTION: An igniter 1 includes: an output terminal; a ground terminal; a switch element connected between the output terminal and the ground terminal; a current detection resistor 12 connected between the switch element and the ground terminal; an input terminal to which an ignition instruction signal is input; and a control circuit 13 for driving the switch element on the basis of the ignition instruction signal. The control circuit 13 includes: a reference voltage resistor R11 the one terminal of which is connected to a terminal at a low potential side of the current detection resistor 12, and which generates reference voltage; a comparator 111 including a detection voltage input terminal connected to a terminal at a high potential side of the resistor 12, a reference voltage input terminal connected to the other terminal of the reference voltage resistor R11, and a comparison result output terminal outputting a comparison result signal; and a capacitor C11 connected between the detection voltage input terminal and the reference voltage input terminal, and generates an ignition confirmation signal IGF on the basis of the comparison result signal.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to an igniter and a vehicle including the igniter.

  Conventionally, an igniter for controlling an ignition coil connected to an ignition plug of an engine is known. Patent Document 1 discloses an example of a conventional igniter. The igniter disclosed in this document controls the ignition coil in accordance with an ignition instruction signal IGT (Ignition Timing) input from an ECU (Engine Control Unit). Further, the igniter generates an ignition confirmation signal IGF (Ignition Flag) and outputs it to the ECU.

  FIG. 9 is a circuit diagram showing a conventional igniter 100. The igniter 100 receives the ignition instruction signal IGT from the ECU 2 and controls the ignition coil in accordance with the ignition instruction signal IGT. The drive unit 133 of the igniter 100 controls on / off of the switch element 11 by controlling a gate voltage of the switch element 11 (for example, an IGBT (Insulated Gate Bipolar Transistor)) in accordance with the ignition instruction signal IGT. When the switch element 11 is switched from on to off, a high voltage is generated in the secondary coil of the ignition coil and applied to the spark plug.

  The igniter 100 includes an ignition confirmation unit 1340 that generates an ignition confirmation signal IGF. The ignition confirmation unit 1340 generates the ignition confirmation signal IGF by comparing the inter-terminal voltage (detection voltage Vcs) of the current detection resistor 12 with the reference voltages Vref1, Vref2 (> Vref1). The comparator 111 compares the reference voltage Vref1 set by the resistor R11 with the detection voltage Vcs. The comparator 121 compares the reference voltage Vref2 set by the resistor R21 with the detection voltage Vcs. Based on the comparison result input from the comparator 111 and the comparator 121, the IGF generation circuit 1341 is at a low level when the detection voltage Vcs is a voltage between the reference voltage Vref1 and the reference voltage Vref2 (Vref1 <Vc <Vref2). Is generated and output to the ECU 2 as an ignition confirmation signal IGF.

  In the igniter 100, the ignition confirmation signal IGF may be disturbed when noise is superimposed. The path from the low potential side of the current detection resistor 12 to the non-inverting input terminal of the comparator 111 via the current detection resistor 12 and the inverting input of the comparator 111 from the low potential side of the current detection resistor 12 via the resistor R11 The impedance differs from the path to the terminal due to the difference in parasitic inductance due to the path difference. Further, the parasitic capacitance in the semiconductor substrate or the ignition coil on which the control circuit 13 is integrated also affects the impedance. Therefore, a phase difference occurs in the input noise between the non-inverting input terminal and the inverting input terminal. When the phase of noise input to the comparator 111 is different between the non-inverting input terminal and the inverting input terminal, the determination capability is reduced due to high-frequency fluctuations in the reference voltage Vref1. In this case, the overdrive voltage necessary for switching the output logic of the comparator 111 is increased. That is, it is the same as the reference voltage Vref1 has increased. In this case, the comparator 111 cannot correctly compare the reference voltage Vref1 and the detection voltage Vcs. The same applies to the comparator 121.

  FIG. 10 is an operation waveform diagram of the igniter 100. Note that the operation waveform diagram shown in FIG. 10 is simplified for the convenience of understanding (the same applies to FIG. 7). FIG. 10A is an operation waveform diagram when noise is not superimposed. While the ignition instruction signal IGT is at a high level, the drive unit 133 turns on the switch element 11, so that the current Ic flowing through the switch element 11 increases. As a result, the detection voltage Vcs also increases. The ignition confirmation signal IGF becomes high level when the detection voltage Vcs is lower than the reference voltage Vref1, becomes low level when the detection voltage Vcs becomes higher than the reference voltage Vref1, and when the detection voltage Vcs becomes higher than the reference voltage Vref2. Is at a high level.

  FIG. 10B is an operation waveform diagram in the case where noise is superimposed, and shows an example in which the reference voltages Vref1 and Vref2 are increased as the overdrive voltage increases due to the phase difference of noise. Also in FIG. 10B, the ignition confirmation signal IGF is at a low level only during the period in which the detection voltage Vcs is between the reference voltage Vref1 and the reference voltage Vref2 (see the ignition confirmation signal IGF indicated by the solid line). However, since the reference voltages Vref1 and Vref2 are high due to the phase difference of the noise, the ignition confirmation signal IGF has a pulse compared to the waveform when noise is not superimposed (see the ignition confirmation signal IGF indicated by the broken line). Is shifted to the right. The waveform of the ignition confirmation signal IGF varies depending on the state of noise. The pulse may shift to the left, the pulse width may change, or the pulse may disappear.

JP 2008-2392 A

  The present disclosure has been conceived under the circumstances described above, and an object thereof is to provide an igniter capable of suppressing the disturbance of the ignition confirmation signal IGF due to noise.

  An igniter provided by the present disclosure includes an output terminal connected to a primary coil of an ignition coil, a ground terminal grounded, a switch element connected between the output terminal and the ground terminal, and the switch element A current detection resistor connected between the control terminal and the ground terminal; an input terminal to which an ignition instruction signal is input from an engine control device; and a control circuit for driving the switch element based on the ignition instruction signal. The control circuit has one terminal connected to a low potential side terminal of the current detection resistor and a reference voltage resistor for generating a reference voltage, and a high potential side terminal of the current detection resistor. Detection voltage input terminal, a reference voltage input terminal connected to the other terminal of the reference voltage resistor, and a voltage input to the detection voltage input terminal and the reference voltage input A comparator having a comparison result output terminal for outputting a comparison result signal with a voltage input to the child, and a capacitor connected between a pre-detection voltage input terminal and the reference voltage input terminal, and the comparison result An ignition confirmation signal to be output to the engine control device is generated based on the signal.

  According to the igniter of the present disclosure, the phase difference of noise can be suppressed by the capacitor. Therefore, disturbance of the ignition confirmation signal IGF due to noise can be suppressed.

  Other features and advantages of the present disclosure will become more apparent from the detailed description given below with reference to the accompanying drawings.

1 is a block diagram illustrating an overall configuration of a vehicle including an igniter according to a first embodiment of the present disclosure. It is a circuit diagram which shows the detail of the internal structure of the ignition confirmation part of the igniter of FIG. It is a circuit diagram which shows the structural example of a comparator. FIG. 2 is a plan view showing an example of a layout of function ICs of the control circuit of the igniter of FIG. 1. FIG. 5 is a partially enlarged plan view showing details of a part of the layout of FIG. It is a top view which shows an example of the layout of the internal structure of the igniter of FIG. It is an operation | movement waveform diagram of the igniter of FIG. It is a partial enlarged plan view of the layout of the function IC of the control circuit of the igniter according to the second embodiment of the present disclosure. It is a circuit diagram which shows the conventional igniter. It is an operation waveform diagram of the conventional igniter, (a) is an operation waveform diagram when noise is not superimposed, (b) is an operation waveform diagram when noise is superimposed.

  Hereinafter, preferred embodiments of the present disclosure will be specifically described with reference to the drawings.

<First Embodiment>
1 to 7 illustrate an example of an igniter according to the present disclosure. FIG. 1 is a block diagram illustrating an overall configuration of a vehicle A including an igniter 1 according to this embodiment. The vehicle A includes an igniter 1, an ECU 2, a spark plug 3, an ignition coil 4, and a battery 5. Although the vehicle A has other configurations, it is omitted in FIG.

  The ECU 2 is an electronic control unit for performing engine operation control, and is realized by a microcomputer including a CPU and a memory. The ECU 2 generates an ignition instruction signal IGT for instructing the ignition timing of the spark plug 3 as a periodic signal synchronized with the rotation of the engine. The ECU 2 outputs an ignition instruction signal IGT to the igniter 1. The ECU 2 corresponds to the “engine control device” of the present invention.

  The ignition coil 4 generates a high voltage for discharging the spark plug 3. The ignition coil 4 includes a primary coil 41 and a secondary coil 42. One terminal of the primary coil 41 is connected to the battery 5, and the other terminal is connected to the output terminal OUT of the igniter 1. One terminal of the secondary coil 42 is connected to the battery 5, and the other terminal is connected to the spark plug 3.

  The spark plug 3 is provided for each cylinder of the engine (not shown) and explodes the air-fuel mixture in the engine by electric discharge.

  The igniter 1 controls the discharge of the spark plug 3 based on the ignition instruction signal IGT input from the ECU 2. Specifically, the igniter 1 controls the current Ic flowing through the primary coil 41 of the ignition coil 4 based on the ignition instruction signal IGT. The igniter 1 causes a current Ic to flow through the primary coil 41 during a period when the ignition instruction signal IGT is at a high level. And the igniter 1 interrupts | blocks the electric current Ic which flows into the primary coil 41 at the timing which the ignition instruction signal IGT switches from a high level to a low level. As a result, a back electromotive force of several hundred volts is generated in the primary coil 41. At this time, the secondary coil 42 generates a high voltage of, for example, several tens of kV, which is obtained by multiplying the primary side voltage by the turn ratio. The spark plug 3 is discharged by the high voltage applied from the secondary coil 42.

  The igniter 1 includes a power supply terminal VDD, a ground terminal GND, an input terminal IN, an output terminal OUT, and a feedback terminal FB. The power supply terminal VDD is connected to the battery 5 and supplied with a power supply voltage. The ground terminal GND is grounded. The input terminal IN is connected to the ECU 2 via a harness (not shown), and an ignition instruction signal IGT is input from the ECU 2. The output terminal OUT is connected to the primary coil 41 of the ignition coil 4. The feedback terminal FB is connected to the ECU 2 via a harness and outputs an ignition confirmation signal IGF to the ECU 2. The igniter 1 includes a switch element 11, a current detection resistor 12, and a control circuit 13. The igniter 1 is provided as a semiconductor integrated circuit device in which a switch element 11, a current detection resistor 12, and a control circuit 13 are packaged.

  The switch element 11 is, for example, an IGBT, and is switched on / off by the control circuit 13 to switch between conduction and non-conduction between the output terminal OUT and the ground terminal GND. The collector terminal of the switch element 11 is connected to the primary coil 41 of the ignition coil 4 via the output terminal OUT. The emitter terminal of the switch element 11 is grounded via the ground terminal GND. The gate terminal of the switch element 11 is connected to the control circuit 13. The switch element 11 is turned on / off in response to a gate drive signal input from the control circuit 13 to the gate terminal. The switch element 11 is not limited to the IGBT, and may be another switch element such as a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).

  The current detection resistor 12 is a resistor connected between the emitter terminal of the switch element 11 and the ground terminal GND. In FIG. 1, the resistor connected in series to the ground terminal GND side of the resistor 12 represents a parasitic resistance of a lead 402 (a lead having the ground terminal GND) described later. When the switch element 11 is in the ON state, the current Ic flowing through the primary coil 41 of the ignition coil 4 flows through the current detection resistor 12. Therefore, a detection voltage Vcs proportional to the current Ic is generated between the terminals of the current detection resistor 12. The resistance value of the current detection resistor 12 is, for example, about several mΩ to several tens mΩ. Therefore, even if the current Ic flowing through the current detection resistor 12 is several A to several tens of A, the detection voltage Vcs can be suppressed to several mV to several hundred mV. In the present embodiment, the current detection resistor 12 is a resistance component of a bonding wire disposed in a current path between the emitter terminal of the switch element 11 and the ground terminal GND. The current detection resistor 12 may be a chip component or a resistor integrated in a functional IC of the control circuit 13 described later.

  The control circuit 13 controls the igniter 1 and is a functional IC integrated on a semiconductor substrate. The control circuit 13 controls the switch element 11 based on the ignition instruction signal IGT input from the ECU 2. Further, the control circuit 13 monitors the current Ic flowing through the primary coil 41, generates an ignition confirmation signal IGF, and outputs it to the ECU 2. The control circuit 13 also has a current limiting function for limiting the current Ic flowing through the switch element 11 to a predetermined upper limit value or a predetermined standby period (for example, about 100 ms) while the ignition instruction signal IGT is kept at the logical level at the time of ON. ), A timer protection function for forcibly turning off the switch element 11 is provided.

  The control circuit 13 includes a power supply pad 201, a ground pad 202, an input pad 203, a gate output pad 204, a feedback output pad 205, a sense input pad 206, and a sense ground pad 207. The power pad 201 is connected to the power terminal VDD, and the ground pad 202 is connected to the ground terminal GND. The input pad 203 is connected to the input terminal IN, the gate output pad 204 is connected to the gate terminal of the switch element 11, and the feedback output pad 205 is connected to the feedback terminal FB. The sense input pad 206 is connected to a terminal on the high potential side of the current detection resistor 12. The sense ground pad 207 is connected to a terminal on the low potential side of the current detection resistor 12. In addition, the control circuit 13 includes a drive unit 133 and an ignition confirmation unit 134.

  The drive unit 133 controls the switch element 11. The drive unit 133 controls on / off of the switch element 11 by controlling the voltage of the gate terminal of the switch element 11 in accordance with the ignition instruction signal IGT input from the ECU 2. The drive unit 133 includes a high-frequency filter, a comparator, a delay circuit, and a driver (not shown). The high frequency filter removes high frequency noise from the ignition instruction signal IGT and outputs the result to the comparator. The comparator compares the ignition instruction signal IGT from which high-frequency noise has been removed with a threshold value to determine a level (high level or low level). The comparator outputs the determination result as a determination signal to the delay circuit. The delay circuit gives a predetermined delay to the determination signal and outputs it to the driver. The driver generates and outputs a gate drive signal at a level capable of driving the switch element 11 based on the determination signal. The drive unit 133 turns on the switch element 11 while the ignition instruction signal IGT is at a high level, and turns off the switch element 11 while the ignition instruction signal IGT is at a low level. When the ignition instruction signal IGT is switched from the high level to the low level, the switch element 11 is switched from on to off. Thereby, a high voltage is generated in the secondary coil 42 of the ignition coil 4, and the high voltage is applied to the spark plug 3.

  The ignition confirmation unit 134 generates an ignition confirmation signal IGF based on the current Ic flowing through the primary coil 41 and outputs it to the ECU 2. The ignition confirmation unit 134 generates the ignition confirmation signal IGF by comparing the current Ic with the reference currents Iref1 and Iref2 (> Iref1). Actually, the ignition confirmation unit 134 sets the voltage (detection voltage Vcs) between the terminals of the current detection resistor 12 to the reference voltage Vref1 corresponding to the reference current Iref1 and the reference voltage Vref2 (> Vref1) corresponding to the reference current Iref2. ) To generate an ignition confirmation signal IGF. When the detected voltage Vcs is a voltage between the reference voltage Vref1 and the reference voltage Vref2 (Vref1 <Vc <Vref2), the ignition confirmation unit 134 becomes the first level (for example, low level), and otherwise (Vc A signal that becomes a second level (for example, a high level) is generated at <Vref1, Vref2 <Vc), and is output to the ECU 2 as an ignition confirmation signal IGF. Note that the first level may be a high level and the second level may be a low level.

  FIG. 2 is a circuit diagram showing details of the internal configuration of the ignition confirmation unit 134. The ignition confirmation unit 134 includes a first comparison unit 110, a second comparison unit 120, a third comparison unit 130, a fourth comparison unit 140, a logic operation unit 101, and an output transistor 102.

  The first comparison unit 110 compares the detection voltage Vcs with the reference voltage Vref1. The first comparison unit 110 includes a comparator 111, a resistor R11, a capacitor C11, and resistors R12 and R13. The resistor R11 is a resistor for setting the reference voltage Vref1. The comparator 111 compares the detection voltage Vcs with the reference voltage Vref1. The non-inverting input terminal of the comparator 111 is connected to the sense input pad 206. The inverting input terminal of the comparator 111 is connected to the sense ground pad 207 via the resistor R11. An output terminal of the comparator 111 is connected to the logic operation unit 101, and outputs a comparison result between the detection voltage Vcs and the reference voltage Vref1. The comparator 111 outputs a comparison signal S11 that becomes a high level when the detection voltage Vcs is larger than the reference voltage Vref1 (Vcs> Vref1) and becomes a low level when the detection voltage Vcs is smaller than the reference voltage Vref1 (Vcs <Vref1). . Note that a specific circuit configuration of the comparator 111 is not limited. The resistor R11 corresponds to the “reference voltage resistor” of the present invention. Further, the comparator 111, the non-inverting input terminal, the inverting input terminal, and the output terminal are respectively used as the “comparator”, “detection voltage input terminal”, “reference voltage input terminal”, and “comparison result output terminal” of the present invention. Equivalent to.

  FIG. 3 is a circuit diagram illustrating a configuration example of the comparator 111. The comparator 111 includes a transistor TR1, a transistor TR2, a transistor TR3, a current source CS1, a current source CS2, a current source CS3, a resistor R1, and a resistor R2.

  Transistors TR1 and TR2 are NPN bipolar transistors. The collector terminal of the transistor TR1 is connected to the current source CS1 through the resistor R1, and the collector terminal of the transistor TR2 is connected to the current source CS2 through the resistor R2. The base terminal of the transistor TR1 and the base terminal of the transistor TR2 are connected in common, and are connected to the collector terminal of the transistor TR1. The emitter terminal of the transistor TR1 is connected to the inverting input terminal (−). The emitter terminal of the transistor TR2 is connected to the non-inverting input terminal (+). The transistors TR1 and TR2 constitute a differential input unit of the comparator 111, and the emitter voltage of the transistor TR1 and the emitter voltage of the transistor TR2 are compared, and according to the magnitude relationship between the reference voltage Vref1 and the detection voltage Vcs. The collector voltage Vx of the transistor TR2 changes.

  The current source CS3 and the transistor TR3 constitute an emitter follower type output stage. The collector terminal of the transistor TR3 is connected to the current source CS3, the base terminal is connected to the collector terminal of the transistor TR2, and the emitter terminal is grounded. The transistor TR3 outputs a comparison signal S11 from the collector terminal according to the collector voltage Vx of the transistor TR2. Note that a specific circuit of the comparator 111 is not limited.

  The capacitor C11 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 111. The capacitance of the capacitor C11 is, for example, about 0.1 to 100 pF. In the present embodiment, the capacitor C11 is a capacitor in which two capacitors of about 0.05 to 50 pF are connected in parallel. The capacitor C11 may be a capacitor in which three or more capacitors are connected in parallel, or a single capacitor. Capacitor C11 smoothes the voltage between the terminals, whereby the voltage input to the non-inverting input terminal (detection voltage Vcs with noise superimposed) and the voltage input to the inverting input terminal (reference voltage with noise superimposed). The phase difference from Vref1) is suppressed. The capacitor C11 corresponds to the “capacitor” of the present invention.

  The resistor R12 has one terminal connected to the non-inverting input terminal of the comparator 111 and the other terminal connected to the sense input pad 206. Resistor R13 has one terminal connected to resistor R11 and the other terminal connected to sense ground pad 207. The resistor R13 may have one terminal connected to the inverting input terminal of the comparator 111 and the other terminal connected to the resistor R11. The resistance value of the resistor R12 and the resistance value of R13 are about the same, for example, about 100Ω to 10 kΩ. The resistor R12 and the capacitor C11 constitute an RC filter that removes a high frequency input to the non-inverting input terminal of the comparator 111. Further, the resistor R13 and the capacitor C11 constitute an RC filter that removes a high frequency input to the inverting input terminal of the comparator 111. Capacitor C11 and resistors R12 and R13 remove high frequency noise input to each input terminal of comparator 111. The cutoff frequency of the RC filter constituted by the capacitor C11 and the resistors R12 and R13 is higher than the frequency component (tens to hundreds of Hz) of the waveform of the detection voltage Vcs during normal operation, and the frequency of the noise to be removed (radio The reception failure BCI is set lower than 1 MHz). Therefore, the cut-off frequency is preferably about several hundred Hz to several tens kHz. Since the resistance value of the resistor R12 and the resistance value of R13 are approximately the same, the voltage drop due to the resistor R12 and the voltage drop due to the resistor R13 are approximately the same. Therefore, the detection voltage Vcs and the reference voltage Vref1 can be compared by comparing the voltage input to the non-inverting input terminal and the voltage input to the inverting input terminal. The resistor R12 and the resistor R13 correspond to the “first resistor” and the “second resistor” of the present invention, respectively.

  The second comparison unit 120 compares the detection voltage Vcs with the reference voltage Vref2. The second comparison unit 120 includes a comparator 121, a resistor R21, a capacitor C21, and resistors R22 and R23. The resistor R21 is a resistor for setting the reference voltage Vref2. The comparator 121 compares the detection voltage Vcs with the reference voltage Vref2. The non-inverting input terminal of the comparator 121 is connected to the sense input pad 206. The inverting input terminal of the comparator 121 is connected to the sense ground pad 207 via the resistor R21. The output terminal of the comparator 121 is connected to the logic operation unit 101 and outputs a comparison result between the detection voltage Vcs and the reference voltage Vref2. The comparator 121 outputs a comparison signal S12 that is at a high level when the detection voltage Vcs is greater than the reference voltage Vref1 (Vcs> Vref2) and that is at a low level when the detection voltage Vcs is less than the reference voltage Vref2 (Vcs <Vref2). . Note that a specific circuit configuration of the comparator 121 is not limited. The resistor R21 corresponds to the “second reference voltage resistor” of the present invention. Further, the comparator 121, the non-inverting input terminal, the inverting input terminal, and the output terminal are respectively referred to as “second comparator”, “second detection voltage input terminal”, “second reference voltage input terminal”, and “ This corresponds to a “second comparison result output terminal”.

  The capacitor C21 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 121. The capacitor C21 is the same capacitor as the capacitor C11 of the first comparison unit 110, and is connected for the same purpose. The capacitor C21 corresponds to the “second capacitor” of the present invention. The resistor R22 has one terminal connected to the non-inverting input terminal of the comparator 121 and the other terminal connected to the sense input pad 206. Resistor R23 has one terminal connected to resistor R21 and the other terminal connected to sense ground pad 207. The resistor R23 may have one terminal connected to the inverting input terminal of the comparator 121 and the other terminal connected to the resistor R21. The resistance value of the resistor R22 and the resistance value of R23 are approximately the same. The resistors R22 and R23 are the same resistors as the resistors R12 and R13 of the first comparison unit 110, respectively, and are connected for the same purpose.

  The logical operation unit 101 performs a logical operation based on the comparison signal S11 input from the first comparison unit 110 and the comparison signal S12 input from the second comparison unit 120, and an operation result signal S15 indicating the operation result. Is output. The logical operation unit 101 calculates the logical product of the comparison signal S11 and the inverted signal of the comparison signal S12. When both the comparison signal S11 and the comparison signal S12 are at the low level (Vcs <Vref1), the logic operation unit 101 sets the operation result signal S15 to the low level. Further, the logic operation unit 101 sets the operation result signal S15 to the high level when the comparison signal S11 is at the high level and the comparison signal S12 is at the low level (Vref1 <Vcs <Vref2). Further, when both the comparison signal S11 and the comparison signal S12 are at the high level (Vcs> Vref2), the logic operation unit 101 sets the operation result signal S15 to the low level. That is, the calculation result signal S15 is at a high level only during a period in which the comparison signal S11 is at a high level and the comparison signal S12 is at a low level (Vref1 <Vcs <Vref2). The logic operation unit 101 is not limited, and may be designed according to the combination of the high level and the low level of the comparison signals S11 and S12 and the operation result signal S15.

The output transistor 102 is an open drain (open collector) type transistor, and is, for example, an N-channel MOSFET in this embodiment. The drain terminal of the output transistor 102 is connected to the feedback terminal FB via the feedback output pad 205. The source terminal of the output transistor 102 is grounded. An operation result signal S 15 is input from the logic operation unit 101 to the gate terminal of the output transistor 102. When the calculation result signal S15 is at a high level, the ignition confirmation signal IGF is at a low level, and when the calculation result signal S15 is at a low level, the ignition confirmation signal IGF is at a high level. The feedback terminal FB is connected to the ECU 2 via a harness. The ECU 2 detects whether or not the igniter 1 is operating normally based on the ignition confirmation signal IGF input from the feedback terminal FB.

  The third comparison unit 130 detects that the current Ic has reached the first upper limit current Iref3 by comparing the current Ic with the first upper limit current Iref3 (> Iref2). Actually, the third comparison unit 130 compares the detection voltage Vcs with a reference voltage Vref3 (> Vref2) corresponding to the first upper limit current Iref3. The third comparison unit 130 includes a comparator 131, a resistor R31, a capacitor C31, and resistors R32 and R33. The resistor R31 is a resistor for setting the reference voltage Vref3. The comparator 131 compares the detection voltage Vcs with the reference voltage Vref3. The non-inverting input terminal of the comparator 131 is connected to the sense input pad 206. The inverting input terminal of the comparator 131 is connected to the sense ground pad 207 via the resistor R31. The output terminal of the comparator 131 is connected to a current limiting unit (not shown) of the driving unit 133, and outputs a comparison result between the detection voltage Vcs and the reference voltage Vref3. The comparator 131 outputs a comparison signal S13 that is at a high level when the detection voltage Vcs is greater than the reference voltage Vref3 (Vcs> Vref3) and is at a low level when the detection voltage Vcs is less than the reference voltage Vref3 (Vcs <Vref3). . The specific circuit configuration of the comparator 131 is not limited. The resistor R31 corresponds to the “third reference voltage resistor” of the present invention. Further, the comparator 131, the non-inverting input terminal, the inverting input terminal, and the output terminal are respectively referred to as the “third comparator”, “third detection voltage input terminal”, “third reference voltage input terminal”, and “ This corresponds to a “third comparison result output terminal”.

  The capacitor C31 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 131. The capacitor C31 is the same capacitor as the capacitor C11 of the first comparison unit 110, and is connected for the same purpose. The capacitor C31 corresponds to the “third capacitor” of the present invention. The resistor R32 has one terminal connected to the non-inverting input terminal of the comparator 131 and the other terminal connected to the sense input pad 206. Resistor R33 has one terminal connected to resistor R31 and the other terminal connected to sense ground pad 207. The resistor R33 may have one terminal connected to the inverting input terminal of the comparator 131 and the other terminal connected to the resistor R31. The resistance value of the resistor R32 and the resistance value of R33 are approximately the same. The resistors R32 and R33 are respectively the same resistors as the resistors R12 and R13 of the first comparison unit 110, and are connected for the same purpose.

  The fourth comparison unit 140 detects that the current Ic has reached the second upper limit current Iref4 by comparing the current Ic with the second upper limit current Iref4 (<Iref3). Actually, the fourth comparison unit 140 compares the detection voltage Vcs with a reference voltage Vref4 (<Vref3) corresponding to the second upper limit current Iref4. The fourth comparison unit 140 includes a comparator 141, a resistor R41, a capacitor C41, and resistors R42 and R43. The resistor R41 is a resistor for setting the reference voltage Vref4. The comparator 141 compares the detection voltage Vcs with the reference voltage Vref4. The non-inverting input terminal of the comparator 141 is connected to the sense input pad 206. The inverting input terminal of the comparator 141 is connected to the sense ground pad 207 via the resistor R41. The output terminal of the comparator 141 is connected to a current limiting unit (not shown) of the driving unit 133, and outputs a comparison result between the detection voltage Vcs and the reference voltage Vref4. The comparator 141 outputs a comparison signal S14 that is at a high level when the detection voltage Vcs is greater than the reference voltage Vref4 (Vcs> Vref4) and that is at a low level when the detection voltage Vcs is less than the reference voltage Vref4 (Vcs <Vref4). . Note that the specific circuit configuration of the comparator 141 is not limited. The resistor R41 corresponds to the “third reference voltage resistor” of the present invention. In addition, the comparator 141, the non-inverting input terminal, the inverting input terminal, and the output terminal are the “third comparator”, “third detection voltage input terminal”, “third reference voltage input terminal”, and “ This corresponds to a “third comparison result output terminal”.

  The capacitor C41 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 141. The capacitor C41 is a capacitor similar to the capacitor C11 of the first comparison unit 110, and is connected for the same purpose. The capacitor C41 corresponds to the “third capacitor” of the present invention. The resistor R42 has one terminal connected to the non-inverting input terminal of the comparator 141 and the other terminal connected to the sense input pad 206. The resistor R43 has one terminal connected to the resistor R41 and the other terminal connected to the sense ground pad 207. The resistor R43 may have one terminal connected to the inverting input terminal of the comparator 141 and the other terminal connected to the resistor R41. The resistance value of the resistor R42 and the resistance value of R43 are approximately the same. The resistors R42 and R43 are respectively the same resistors as the resistors R12 and R13 of the first comparison unit 110, and are connected for the same purpose.

  Based on the comparison signal S13 input from the third comparison unit 130 and the comparison signal S14 input from the fourth comparison unit 140, the current limiting unit of the drive unit 133 is in the ON period of the gate terminal of the switch element 11. Limit the voltage. Thereby, the current Ic flowing through the switch element 11 is limited. The current limiting unit limits the current Ic to the first upper limit current Iref3 by limiting the voltage during the ON period of the gate terminal of the switch element 11 when the comparison signal S13 is at a high level. In addition, the current limiting unit is configured to switch the gate terminal of the switch element 11 during the ON period based on the comparison signal S14 (when the comparison signal S14 is at a high level) when the switch element 11 remains on for a predetermined time. By limiting the voltage, the current Ic is limited to the second upper limit current Iref4.

  The ignition confirmation unit 134 may include a similar comparison unit in addition to the first comparison unit 110, the second comparison unit 120, the third comparison unit 130, and the fourth comparison unit 140. That is, the control circuit 13 may compare the detection voltage Vcs with a predetermined reference voltage to compare the current Ic flowing through the switch element 11 with the predetermined reference current, and use the comparison result signal for various controls. .

  FIG. 4 is a plan view showing an example of the layout of the functional IC of the control circuit 13. The control circuit 13 includes a semiconductor substrate 200. The power supply pad 201, the ground pad 202, the input pad 203, the gate output pad 204, the feedback output pad 205, the sense input pad 206, and the sense ground pad 207 of the control circuit 13 are disposed on the semiconductor substrate 200. In addition, each functional element constituting the drive unit 133 and the ignition confirmation unit 134 of the control circuit 13 is formed on the semiconductor substrate 200. In FIG. 4, the thickness direction (plan view direction) of the semiconductor substrate 200 is the z direction (z1-z2 direction), and the direction along one side of the semiconductor substrate 200 orthogonal to the z direction (the left-right direction in FIG. 4). Is assumed to be the x direction (x1-x2 direction), and the z direction and the direction (vertical direction in FIG. 4) perpendicular to the x direction are assumed to be the y direction (y1-y2 direction) (the same applies to FIG. 5). The x direction corresponds to the “first direction” of the present invention, and the y direction corresponds to the “second direction” of the present invention.

  The power supply pad 201, the sense input pad 206, and the sense ground pad 207 are disposed at the end of the semiconductor substrate 200 in the y1 direction. The power supply pad 201 is disposed at the end in the x2 direction, and the dimension in the x direction is longer than the dimension in the y direction. The sense input pad 206 is disposed near the end in the x1 direction, and the dimension y6 in the y direction is longer than the dimension x6 in the x direction. The sense ground pad 207 is disposed near the center in the x direction, and the dimension y7 in the y direction is longer than the dimension x7 in the x direction. The ground pad 202, the input pad 203, and the feedback output pad 205 are disposed at the end of the semiconductor substrate 200 in the y2 direction. The ground pad 202 is disposed at the end in the x2 direction, and the dimension in the y direction is longer than the dimension in the x direction. The input pad 203 is arranged near the end in the x1 direction, and the dimension in the y direction is longer than the dimension in the x direction. The feedback output pad 205 is disposed near the center in the x direction, and the dimension in the y direction is longer than the dimension in the x direction. The gate output pad 204 is disposed at the end of the sense input pad 206 in the x1 direction on the y2 side, and the dimension in the x direction is longer than the dimension in the y direction. Each of the pads 201 to 207 has a shape that matches the bonding wire bonding direction.

  The control circuit 13 includes regions 310, 321, 322, 323, 331, 332, 333, 334, 335, 341, 342, 351, and 361 on the semiconductor substrate 200.

  The region 310 is a region where the functional elements constituting the first comparison unit 110, the second comparison unit 120, the third comparison unit 130, and the fourth comparison unit 140 are formed in the ignition confirmation unit 134. Region 310 is located near sense input pad 206 and sense ground pad 207. Region 310 is located between sense input pad 206 and sense ground pad 207 in the x direction. The region 310 is adjacent to the sense input pad 206 and the sense ground pad 207 in the y direction. The region 310 is entirely located on the sense input pad 206 and sense ground pad 207 side (y1 direction side) from the center of the semiconductor substrate 200 in the y direction. Since region 310 is arranged near sense input pad 206 and sense ground pad 207, for example, in first comparison unit 110, wiring from sense input pad 206 to resistor R12 and from sense ground pad 207 to resistor R13 Can be shortened. The same applies to the second comparison unit 120, the third comparison unit 130, and the fourth comparison unit 140.

  FIG. 5 is a partially enlarged plan view showing details of the region 310. The region 310 includes a region 311, a region 312, a region 313, a region 314, and a region 315.

  Region 311 is a region where resistors R12, R13, R22, R23, R32, R33, R42, and R43 are formed. Within the region 311, the resistor R12 and the resistor R13 are disposed adjacent to each other, the resistor R22 and the resistor R23 are disposed adjacent to each other, the resistor R32 and the resistor R33 are disposed adjacent to each other, the resistor R42 and the resistor R43, Are arranged adjacent to each other. The region 311 is disposed at the end in the x1 direction in the region 310. As shown in FIG. 4, the region 311 is located at an equal distance from the sense input pad 206 and the sense ground pad 207. More specifically, the center position in the x direction of the region 311 is equidistant from the x2 direction edge of the sense input pad 206 and the x1 direction edge of the sense ground pad 207 in the x direction. That is, the region 311 is located between the sense input pad 206 and the sense ground pad 207 in the x direction. Therefore, for example, in the first comparison unit 110, the wiring from the sense input pad 206 to the resistor R12 and the wiring from the sense ground pad 207 to the resistor R13 can be set to the same length. The same applies to the second comparison unit 120, the third comparison unit 130, and the fourth comparison unit 140.

  A region 312 is a region where capacitors C11, C21, C31, and C41 are formed. The region 312 is disposed adjacent to the region 311 on the x2 direction side. As described above, each of the capacitors C11, C21, C31, and C41 is formed by connecting two capacitors in parallel, and eight capacitors are formed in the region 312. Since the region 312 is adjacent to the region 311, for example, in the first comparison unit 110, the wiring connecting the capacitor C11 and the resistor R12 can be shortened. Further, when the resistor R13 is disposed closer to the comparator 111 than the resistor R11, the wiring connecting the capacitor C11 and the resistor R13 can be shortened. The same applies to the second comparison unit 120, the third comparison unit 130, and the fourth comparison unit 140.

  A region 313 is a region where two transistors (transistors TR1 and TR2 in FIG. 3) included in the comparators 111, 121, 131, and 141 are formed. The region 313 is disposed adjacent to the region 312 on the x2 direction side. In the region 313, eight transistors are formed. Since the region 313 is adjacent to the region 312, for example, in the first comparison unit 110, the wiring connecting the comparator 111 and the capacitor C11 can be shortened. The same applies to the second comparison unit 120, the third comparison unit 130, and the fourth comparison unit 140. The region 313 is disposed near the region 311. Therefore, for example, in the first comparison unit 110, the wiring connecting the comparator 111 and the resistor R12 can be shortened. In addition, when the resistor R13 is disposed closer to the comparator 111 than the resistor R11, the wiring connecting the comparator 111 and the resistor R13 can be shortened. The same applies to the second comparison unit 120, the third comparison unit 130, and the fourth comparison unit 140.

  The region 314 is a region where a protection diode (not shown in FIG. 3) included in the comparators 111, 121, 131, and 141 is formed. The region 314 is disposed adjacent to the region 313 on the x2 direction side. In the region 314, four diodes are formed. In the present embodiment, two diodes are formed at the end of the region 314 in the y1 direction, and two diodes are formed at the end of the y2 direction. The region 314 includes a region 314a where no functional element is formed at the center in the y direction.

  Region 315 is a region where resistors (resistors R1 and R2 in FIG. 3) included in comparators 111, 121, 131, and 141 for limiting an external surge current from sense input pad 206 and sense ground pad 207 are formed. It is. The region 315 is disposed adjacent to the region 314 on the x2 direction side. In the region 315, a plurality of resistors having different resistance values are connected in parallel to each other and formed for each comparator. Only one resistor of a plurality of resistors connected in parallel is actually used. Other resistors will not function because the wiring is cut. In the region 314a, no functional element is formed so as not to interfere with the cutting operation. A region including the regions 313, 314, and 315 corresponds to a “region where a comparator is formed” in the present invention.

  The resistors R12, R13, R22, R23, R32, R33, R42, and R43 formed in the region 311 easily generate heat by consuming noise. In addition, the first comparison unit 110, the second comparison unit 120, the third comparison unit 130, and the fourth comparison unit 140 formed in the region 310 are susceptible to external noise. Therefore, in this embodiment, in order to suppress the influence of these heat and external noise on the functional elements formed in other regions, the region 310 is located at a position surrounded by the other regions at the center on the semiconductor substrate 200. Instead, the semiconductor substrate 200 is disposed as close to the peripheral edge as possible.

  Returning to FIG. 4, a region 321 is a region where resistors R11, R21, R31, and R41 for setting a reference voltage for each comparator to compare with the detection voltage Vcs are formed. The resistance values of these resistors can be adjusted by laser trimming to adjust the reference voltage. The region 321 is disposed adjacent to the region 310 on the x2 direction side. The region 322 is a region in the ignition confirmation unit 134 where the logic operation unit 101, the output transistor 102, and the like are formed. The region 323 is a region where a protection circuit for protecting the control circuit 13 from a surge or noise input from the feedback output pad 205 is formed.

  The region 331 is a region where a protection circuit for protecting the control circuit 13 from a surge or noise input from the input pad 203 is formed. The region 332 is a region in the driving unit 133 where a high frequency filter, a comparator, a delay circuit, and the like are formed. The region 333 is a region where an oscillation circuit that generates an internal clock, a timer, and the like are formed. The region 334 is a region where a logic circuit is formed. The region 335 is a region where a driver of the driving unit 133 is formed.

  The region 341 is a region where the internal power supply of the control circuit 13 is formed. The region 342 is a region where a circuit for generating the internal reference voltage of the control circuit 13 is formed. Region 351 is a region where a protection circuit for protecting control circuit 13 from surges and noises input from power supply pad 201 and ground pad 202 is formed. The region 361 is a region where a test pad is formed. The layout of the functional IC of the control circuit 13 is not limited to that shown in FIGS.

  FIG. 6 is a plan view showing an example of the layout of the internal configuration of the igniter 1. The igniter 1 is accommodated in a lead frame package, and is composed of, for example, a 6-pin SiP (Single In-Line Package). In FIG. 6, a portion covered with a sealing resin made of, for example, a black epoxy resin is indicated by a two-dot chain line. The igniter 1 includes leads 401 to 408. In FIG. 6 as well, description will be given based on the direction of the control circuit 13 to be mounted according to the semiconductor substrate 200.

  The lead 401 has a power supply terminal VDD, and is disposed at the end in the y2 direction at the end in the x2 direction of the package. The lead 407 is disposed adjacent to the lead 401 on the y1 direction side, and is disposed at the end portion in the y1 direction at the end portion in the x2 direction of the package. The lead 402 has a ground terminal GND, and is disposed on the x1 direction side adjacent to the lead 401 and the lead 407. The lead 402 extends from the end in the y1 direction to the end in the y2 direction of the package. The lead 404 has an output terminal OUT, and is disposed adjacent to the lead 402 on the x1 direction side. The lead 404 is disposed at the end portion in the x1 direction of the package and extends from the end portion in the y1 direction to the end portion in the y2 direction of the package. The lead 406 is disposed between the lead 402 and the lead 404 at the end of the package in the y1 direction. The leads 403, 405, and 408 are disposed between the lead 402 and the lead 404 at the end of the package in the y2 direction. The lead 403 has an input terminal IN and is disposed adjacent to the lead 404. The lead 408 has an unused terminal and is disposed adjacent to the lead 402. The lead 405 has a feedback terminal FB and is disposed between the lead 405 and the lead 408.

  Each of the leads 402 to 408 includes a through hole 400a. When the hole 400a is filled with the sealing resin when covered with the sealing resin, the sealing resin can be prevented from peeling off from the leads 402 to 408 during use of the igniter 1. Further, in each of the leads 401 to 408, a groove 400b is formed at the boundary between the portion covered with the sealing resin and the portion not covered (see the two-dot chain line in FIG. 6). The groove 400b suppresses the flow of a protective resin such as polyimide applied in order to protect the bonding point of the bonding wire to the lead in the step before covering with the sealing resin.

  A semiconductor substrate 200 on which the control circuit 13 is integrated is mounted on the lead 402. The power supply pad 201 is connected to the lead 407 by a bonding wire 501. The ground pad 202 is connected to the lead 402 (ground terminal GND) by a bonding wire 502. The input pad 203 is connected to the lead 403 (input terminal IN) by a bonding wire 503. The gate output pad 204 is connected to a pad 602 described later by a bonding wire 504. The feedback output pad 205 is connected to the lead 405 (feedback terminal FB) by a bonding wire 505. The sense input pad 206 is connected to the lead 406 by a bonding wire 506. The sense ground pad 207 is connected to the lead 402 by a bonding wire 507. The bonding wires 501 to 507 are made of, for example, Al. Note that the bonding wires 501 to 507 may be made of another metal such as an Al alloy, Au, or Cu.

  The switch element 11 is mounted on the lead 404. The switch element 11 includes a semiconductor substrate 600, pads 601 and 602, and a back electrode 603. The semiconductor substrate 600 is a substrate on which a p-type semiconductor layer and an n-type semiconductor layer for forming the switch element 11 such as an IGBT are formed. The pad 601 is an emitter electrode. The pad 602 is a gate electrode. The back electrode 603 is a collector electrode. The pad 601 and the pad 602 are disposed on the surface of the semiconductor substrate 600 (the surface on the front side in FIG. 6). The back electrode 603 is disposed on the back surface of the semiconductor substrate 600. The semiconductor substrate 600 (switch element 11) is mounted such that the back electrode 603 is in contact with the lead 404. Thereby, the collector terminal of the switch element 11 is connected to the output terminal OUT. The pad 601 is connected to the lead 402 by a bonding wire 509, a lead 406 and a bonding wire 508. Thereby, the emitter terminal of the switch element 11 is connected to the ground terminal GND. The pad 602 is connected to the gate output pad 204 by a bonding wire 504. As a result, a gate drive signal is input from the control circuit 13 to the gate terminal of the switch element 11.

  In the present embodiment, the pad 601 is not directly connected to the lead 402 (ground terminal GND) by the bonding wire, but is connected to the lead 406 by the bonding wire 509. The lead 406 is connected to the lead 402 (ground terminal GND) by the bonding wire 508 and is connected to the sense input pad 206 by the bonding wire 506. Therefore, the resistance component of the bonding wire 508 becomes the current detection resistor 12. Bonding wires 508 and 509 are made of, for example, Al. Note that the bonding wires 508 and 509 may be made of another metal such as an Al alloy, Au, or Cu. The bonding wire 508 uses a resistance component for the current detection resistor 12.

  The igniter 1 includes a high-frequency filter that is not shown in FIG. 1 between the power supply terminal VDD and the power supply pad 201 of the control circuit 13. The high-frequency filter is a π-type low-pass filter including capacitors 14 and 16 and a resistor 15. The resistor 15 is bridge-connected between the lead 401 (power supply terminal VDD) and the lead 407. The capacitor 14 is bridge-connected between the lead 401 and the lead 402 (ground terminal GND). The capacitor 16 is bridge-connected between the lead 407 and the lead 402 (ground terminal GND). The lead 407 is connected to the power supply pad 201 of the control circuit 13 by a bonding wire 501. As a result, a high frequency filter for removing high frequency noise input from the power supply terminal VDD is formed.

  The layout of the internal configuration of the igniter 1 is not limited to that shown in FIG. The igniter 1 is not limited to being accommodated in the SiP, and may be accommodated in a DiP (Dual In-line Package) or a ZIP (Zigzag In-line Package). Further, it may be housed in a surface mount package.

  Next, the operation of the igniter 1 will be described.

  According to this embodiment, in the first comparison unit 110, the capacitor C11 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 111. Capacitor C11 smoothes the voltage between the terminals, whereby the voltage input to the non-inverting input terminal (detection voltage Vcs with noise superimposed) and the voltage input to the inverting input terminal (reference voltage with noise superimposed). The phase difference from Vref1) is suppressed. Therefore, since the phase of the high frequency fluctuation of the reference voltage Vref1 and the high frequency fluctuation of the detection voltage Vcs coincide with each other, a decrease in the determination capability of the comparator 111 is suppressed and the overdrive voltage becomes low. Accordingly, an increase in the reference voltage Vref1 is suppressed. The same applies to the second comparison unit 120. The capacitor C21 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 121, so that the phase difference of noise is suppressed. Therefore, an increase in the reference voltage Vref2 is suppressed. Therefore, the comparators 111 and 121 can perform the same determination as when no noise is superimposed. Thereby, disturbance of the ignition confirmation signal IGF due to noise can be suppressed.

  FIG. 7 is an operation waveform diagram of the igniter 1. In FIG. 7, the voltage input to the non-inverting input terminal (detected voltage Vcs superimposed with noise) and the voltage input to the inverting input terminal by the capacitors C11 and C12, even though noise is superimposed. By suppressing a phase difference from (reference voltage Vref1 on which noise is superimposed), an increase in reference voltages Vref1 and Vref2 is suppressed. Therefore, the ignition confirmation signal IGF has a waveform similar to that when no noise is superimposed. That is, the disturbance of the ignition confirmation signal IGF due to noise can be suppressed.

  According to the present embodiment, also in the third comparison unit 130, the capacitor C31 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 131. Thereby, the phase difference of the noise is suppressed, and the voltage that rises due to the noise becomes approximately the same between the detection voltage Vcs and the reference voltage Vref3. Therefore, the comparator 131 can output the same comparison signal S13 as when no noise is superimposed. The same applies to the fourth comparison unit 140, and a capacitor C41 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 141. Thereby, the phase difference of the noise is suppressed, and the voltage that rises due to the noise becomes approximately the same between the detection voltage Vcs and the reference voltage Vref4. Therefore, the comparator 141 can output the comparison signal S14 similar to the case where noise is not superimposed.

  According to the present embodiment, the first comparison unit 110 includes the resistor R12 and the resistor R13. The resistor R12 and the capacitor C11 constitute an RC filter that removes a high frequency input to the non-inverting input terminal of the comparator 111. Further, the resistor R13 and the capacitor C11 constitute an RC filter that removes a high frequency input to the inverting input terminal of the comparator 111. Thereby, the high frequency noise input into each input terminal of the comparator 111 can be removed. The resistance value of the resistor R12 and the resistance value of R13 are approximately the same. In the region 311, the resistor R12 and the resistor R13 are arranged adjacent to each other. Therefore, the resistors R12 and R13 can suppress the influence of the comparator 111 on the comparison between the detection voltage Vcs and the reference voltage Vref1. The same applies to the second comparison unit 120, the third comparison unit 130, and the fourth comparison unit 140.

  Further, according to the present embodiment, the sense input pad 206 and the sense ground pad 207 are disposed at the end in the y1 direction. Therefore, it is convenient to bond a bonding wire between the semiconductor substrate 200 and a member located in the y1 direction. Further, the sense input pad 206 and the sense ground pad 207 have a dimension in the y direction longer than a dimension in the x direction. Therefore, it is easy to bond the bonding wire in the y direction.

  Further, according to the present embodiment, the region 310 is disposed near the sense input pad 206 and the sense ground pad 207. For example, in the first comparison unit 110, the wiring from the sense input pad 206 to the resistor R12 and the wiring from the sense ground pad 207 to the resistor R13 are formed short. This reduces the parasitic inductance of the current path. Therefore, it is possible to suppress the phase difference of noise input between the non-inverting input terminal and the inverting input terminal of the comparator.

  Further, according to the present embodiment, the region 311 is located at an equal distance from the sense input pad 206 and the sense ground pad 207. For example, in the first comparison unit 110, since the resistor R12 and the resistor R13 are arranged adjacent to each other, the wiring from the sense input pad 206 to the resistor R12 and the wiring from the sense ground pad 207 to the resistor R13 are as follows. , Are formed to the same length. Thereby, it is possible to suppress a difference in parasitic inductance of the current path between the wiring from the sense input pad 206 to the resistor R12 and the wiring from the sense ground pad 207 to the resistor R13. Therefore, it is possible to suppress the phase difference of noise input between the non-inverting input terminal and the inverting input terminal of the comparator.

  Further, according to the present embodiment, the region 312 is adjacent to the region 311, and the region 313 is adjacent to the region 312. For example, in the first comparison unit 110, each internal wiring is formed short. This reduces the parasitic inductance of the current path. Therefore, it is possible to suppress the phase difference of noise input between the non-inverting input terminal and the inverting input terminal of the comparator.

  Further, according to the present embodiment, the region 314 includes the region 314a in which no functional element is formed at the center in the y direction. Thereby, the workability of the cutting operation of the resistance wiring formed in the region 315 is improved.

  FIG. 8 illustrates another embodiment of the present disclosure. In FIG. 8, the same or similar elements as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment.

Second Embodiment
FIG. 8 shows the igniter 1 according to the second embodiment of the present disclosure, and is a partially enlarged plan view of the layout of the functional IC of the control circuit 13. The igniter 1 of this embodiment is different from the above-described embodiment in the arrangement method of four diodes in the region 314.

  In the present embodiment, in the region 314, four diodes are formed evenly spaced. According to this embodiment, in each of the comparators 111, 121, 131, and 141, the wiring with the diode formed in the region 314 can be shortened as compared with the case where the four diodes are not evenly arranged.

  The igniter and the vehicle according to the present disclosure are not limited to the above-described embodiments. The specific configuration of each part of the igniter and the vehicle according to the present disclosure can be modified in various ways.

[Appendix 1]
An output terminal connected to the primary coil of the ignition coil;
A ground terminal to be grounded;
A switch element connected between the output terminal and the ground terminal;
A current detection resistor connected between the switch element and the ground terminal;
An input terminal to which an ignition instruction signal is input from the engine control device;
A control circuit for driving the switch element based on the ignition instruction signal;
With
The control circuit includes:
A reference voltage resistor having one terminal connected to a low potential side terminal of the current detection resistor and generating a reference voltage;
A detection voltage input terminal connected to a high potential side terminal of the current detection resistor, a reference voltage input terminal connected to the other terminal of the reference voltage resistor, and a voltage input to the detection voltage input terminal; A comparator comprising a comparison result output terminal for outputting a comparison result signal with a voltage input to the reference voltage input terminal;
A capacitor connected between the pre-detection voltage input terminal and the reference voltage input terminal;
With
Based on the comparison result signal, an ignition confirmation signal to be output to the engine control device is generated.
An igniter characterized by that.
[Appendix 2]
The capacitance of the capacitor is 0.1 to 100 pF.
The igniter according to appendix 1.
[Appendix 3]
The control circuit further comprises a semiconductor substrate,
The reference voltage resistor, the comparator and the capacitor are integrated on the semiconductor substrate;
The igniter according to appendix 1 or 2.
[Appendix 4]
The region where the comparator is formed and the region where the capacitor is formed are adjacent to each other.
The igniter according to appendix 3.
[Appendix 5]
The control circuit includes:
A first pad connected to the detection voltage input terminal;
A second pad connected to the reference voltage input terminal via the reference voltage resistor;
Further comprising
The first pad and the second pad are arranged at one end of the semiconductor substrate in a first direction in which the first pad and the second pad are aligned and in a second direction orthogonal to the thickness direction of the semiconductor substrate. Placed in the
The igniter according to appendix 3 or 4.
[Appendix 6]
The first pad and the second pad have a dimension in the second direction longer than a dimension in the first direction,
The igniter according to appendix 5.
[Appendix 7]
The region where the comparator is formed is located between the first pad and the second pad in the first direction.
The igniter according to appendix 5 or 6.
[Appendix 8]
The region where the comparator is formed is closer to the first pad and the second pad than the center of the semiconductor substrate in the second direction.
The igniter according to any one of appendices 5 to 7.
[Appendix 9]
The control circuit includes:
A first resistor connected between a high potential side terminal of the current detection resistor and the detection voltage input terminal;
A second resistor connected between the ground terminal and the reference voltage input terminal;
Further comprising
The igniter according to any one of appendices 5 to 8.
[Appendix 10]
The first resistor and the second resistor are arranged adjacent to each other and have the same resistance value.
The igniter according to appendix 9.
[Appendix 11]
The region where the first resistor and the second resistor are formed is adjacent to the region where the capacitor is formed.
The igniter according to appendix 9 or 10.
[Appendix 12]
The center position in the first direction of the region where the first resistance and the second resistance are formed is in the center between the edges of the first pad and the second pad facing each other in the first direction.
The igniter according to any one of appendices 9 to 11.
[Appendix 13]
The control circuit includes:
A second reference voltage resistor having one terminal connected to a low potential side terminal of the current detection resistor and generating a second reference voltage;
A second detection voltage input terminal connected to a high potential side terminal of the current detection resistor; a second reference voltage input terminal connected to the other terminal of the second reference voltage resistor; and the second detection voltage. A second comparator comprising a second comparison result output terminal for outputting a second comparison result signal between a voltage input to the input terminal and a voltage input to the second reference voltage input terminal;
A second capacitor connected between the second detection voltage input terminal and the second reference voltage input terminal;
With
Generating the ignition confirmation signal based on the comparison result signal and the second comparison result signal;
The igniter according to any one of appendices 1 to 12.
[Appendix 14]
The control circuit includes:
A third reference voltage resistor having one terminal connected to a low potential side terminal of the current detection resistor and generating a third reference voltage;
A third detection voltage input terminal connected to a high potential side terminal of the current detection resistor, a third reference voltage input terminal connected to the other terminal of the third reference voltage resistor, and the third detection voltage A third comparator comprising a third comparison result output terminal for outputting a third comparison result signal between a voltage input to the input terminal and a voltage input to the third reference voltage input terminal;
A third capacitor connected between the pre-test third output voltage input terminal and the third reference voltage input terminal;
With
Adjusting the driving of the switch element based on the third comparison result signal;
The igniter according to any one of appendices 1 to 13.
[Appendix 15]
The igniter according to any one of appendices 1 to 14, and
Spark plugs,
An ignition coil comprising a primary coil connected to the output terminal, and a secondary coil connected to the spark plug;
An engine control device that generates the ignition instruction signal and outputs the ignition instruction signal to the igniter;
A vehicle comprising:

1: igniter 11: switch element 12: current detection resistor 13: control circuit 133: drive unit 134: ignition check unit 101: logic operation unit 102: output transistor 110: first comparison unit 111: comparators R11, R12, R13: Resistor C11: Capacitor 120: Second comparator 121: Comparator R21, R22, R23: Resistor C21: Capacitor 130: Third comparator 131: Comparator R31, R32, R33: Resistor C31: Capacitor 140: Fourth comparator 141: Comparators R41, R42, R43: Resistor C41: Capacitors CS1-CS3: Current sources R1, R2: Resistors TR1-TR3: Transistor 200: Semiconductor substrate 201: Power supply pad 202: Ground pad 203: Input pad 204: Gate output pad 205: F Feedback output pad 206: Sense input pad 207: Sense ground pads 310, 311, 312, 313, 314, 314a, 315, 321, 322, 323, 331, 332, 333, 334, 335, 341, 342, 351, 361 : Area FB: Feedback terminal GND: Ground terminal IN: Input terminal OUT: Output terminal VDD: Power supply terminals 401 to 408: Leads 501 to 509: Bonding wire 600: Semiconductor substrates 601 and 602: Pad 603: Back electrode 14: Capacitor 15 : Resistance 16: Capacitor 2: ECU
3: Spark plug 4: Ignition coil 41: Primary coil 42: Secondary coil 5: Battery A: Vehicle

Claims (15)

An output terminal connected to the primary coil of the ignition coil;
A ground terminal to be grounded;
A switch element connected between the output terminal and the ground terminal;
A current detection resistor connected between the switch element and the ground terminal;
An input terminal to which an ignition instruction signal is input from the engine control device;
A control circuit for driving the switch element based on the ignition instruction signal;
With
The control circuit includes:
A reference voltage resistor having one terminal connected to a low potential side terminal of the current detection resistor and generating a reference voltage;
A detection voltage input terminal connected to a high potential side terminal of the current detection resistor, a reference voltage input terminal connected to the other terminal of the reference voltage resistor, and a voltage input to the detection voltage input terminal; A comparator comprising a comparison result output terminal for outputting a comparison result signal with a voltage input to the reference voltage input terminal;
A capacitor connected between the pre-detection voltage input terminal and the reference voltage input terminal;
With
Based on the comparison result signal, an ignition confirmation signal to be output to the engine control device is generated.
An igniter characterized by that. The capacitance of the capacitor is 0.1 to 100 pF.
The igniter according to claim 1. The control circuit further comprises a semiconductor substrate,
The reference voltage resistor, the comparator and the capacitor are integrated on the semiconductor substrate;
The igniter according to claim 1 or 2. The region where the comparator is formed and the region where the capacitor is formed are adjacent to each other.
The igniter according to claim 3. The control circuit includes:
A first pad connected to the detection voltage input terminal;
A second pad connected to the reference voltage input terminal via the reference voltage resistor;
Further comprising
The first pad and the second pad are arranged at one end of the semiconductor substrate in a first direction in which the first pad and the second pad are aligned and in a second direction orthogonal to the thickness direction of the semiconductor substrate. Placed in the
The igniter according to claim 3 or 4. The first pad and the second pad have a dimension in the second direction longer than a dimension in the first direction,
The igniter according to claim 5. The region where the comparator is formed is located between the first pad and the second pad in the first direction.
The igniter according to claim 5 or 6. The region where the comparator is formed is closer to the first pad and the second pad than the center of the semiconductor substrate in the second direction.
The igniter according to any one of claims 5 to 7. The control circuit includes:
A first resistor connected between a high potential side terminal of the current detection resistor and the detection voltage input terminal;
A second resistor connected between the ground terminal and the reference voltage input terminal;
Further comprising
The igniter according to any one of claims 5 to 8. The first resistor and the second resistor are arranged adjacent to each other and have the same resistance value.
The igniter according to claim 9. The region where the first resistor and the second resistor are formed is adjacent to the region where the capacitor is formed.
The igniter according to claim 9 or 10. The center position in the first direction of the region where the first resistance and the second resistance are formed is in the center between the edges of the first pad and the second pad facing each other in the first direction.
The igniter according to any one of claims 9 to 11. The control circuit includes:
A second reference voltage resistor having one terminal connected to a low potential side terminal of the current detection resistor and generating a second reference voltage;
A second detection voltage input terminal connected to a high potential side terminal of the current detection resistor; a second reference voltage input terminal connected to the other terminal of the second reference voltage resistor; and the second detection voltage. A second comparator comprising a second comparison result output terminal for outputting a second comparison result signal between a voltage input to the input terminal and a voltage input to the second reference voltage input terminal;
A second capacitor connected between the second detection voltage input terminal and the second reference voltage input terminal;
With
Generating the ignition confirmation signal based on the comparison result signal and the second comparison result signal;
The igniter according to any one of claims 1 to 12. The control circuit includes:
A third reference voltage resistor having one terminal connected to a low potential side terminal of the current detection resistor and generating a third reference voltage;
A third detection voltage input terminal connected to a high potential side terminal of the current detection resistor, a third reference voltage input terminal connected to the other terminal of the third reference voltage resistor, and the third detection voltage A third comparator comprising a third comparison result output terminal for outputting a third comparison result signal between a voltage input to the input terminal and a voltage input to the third reference voltage input terminal;
A third capacitor connected between the pre-test third output voltage input terminal and the third reference voltage input terminal;
With
Adjusting the driving of the switch element based on the third comparison result signal;
The igniter according to any one of claims 1 to 13. An igniter according to any of claims 1 to 14,
Spark plugs,
An ignition coil comprising a primary coil connected to the output terminal, and a secondary coil connected to the spark plug;
An engine control device that generates the ignition instruction signal and outputs the ignition instruction signal to the igniter;
A vehicle comprising:

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