JP7125020B2 - Ignitor and vehicle equipped with said igniter - Google Patents

Description

The present disclosure relates to igniters and vehicles including such igniters.

An igniter for controlling an ignition coil connected to a spark plug of an engine is conventionally known. Patent Document 1 discloses an example of a conventional igniter. The igniter disclosed in the document controls an ignition coil according to an ignition instruction signal IGT (Ignition Timing) input from an ECU (Engine Control Unit). The igniter also 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. As shown in FIG. The igniter 100 receives an ignition instruction signal IGT from the ECU 2 and controls the ignition coil according to the ignition instruction signal IGT. Drive unit 133 of igniter 100 controls the on/off of switch element 11 by controlling the gate voltage of switch element 11 (for example, IGBT (Insulated Gate Bipolar Transistor)) according to 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 also includes an ignition confirmation section 1340 that generates an ignition confirmation signal IGF. Ignition confirmation unit 1340 generates ignition confirmation signal IGF by comparing the voltage across terminals of current detection resistor 12 (detection voltage Vcs) with reference voltages Vref1 and Vref2 (>Vref1). Comparator 111 compares reference voltage Vref1 set by resistor R11 and detection voltage Vcs. Comparator 121 compares reference voltage Vref2 set by resistor R21 and detection voltage Vcs. Based on the comparison results input from the comparators 111 and 121, the IGF generation circuit 1341 is low level when the detection voltage Vcs is between the reference voltage Vref1 and the reference voltage Vref2 (Vref1<Vc<Vref2). and output to the ECU 2 as an ignition confirmation signal IGF.

In the igniter 100, when noise is superimposed, the ignition confirmation signal IGF may be disturbed. A 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 path to the terminal differs in impedance due to the difference in parasitic inductance due to the difference in path. Moreover, the impedance is also affected by the parasitic capacitance in the semiconductor substrate on which the control circuit 13 is integrated and in the ignition coil. Therefore, there is a phase difference in input noise between the non-inverting input terminal and the inverting input terminal. If the phases of noise input to the non-inverting input terminal and the inverting input terminal of the comparator 111 are different, the determination capability is lowered due to the high frequency fluctuation of the reference voltage Vref1. In this case, the overdrive voltage required to switch the output logic of the comparator 111 increases. That is, it is the same as when 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 as well.

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

FIG. 10(b) is an operation waveform diagram when noise is superimposed, and shows an example in which the reference voltages Vref1 and Vref2 are increased by increasing the overdrive voltage due to the phase difference of the noise. In FIG. 10(b), the ignition confirmation signal IGF is at low level only during the period 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 is pulsed compared to the waveform when noise is not superimposed (see the ignition confirmation signal IGF indicated by the dashed line). is shifted to the right. The waveform of the ignition confirmation signal IGF differs depending on the state of noise. The pulse may shift to the left, the pulse width may change, or the pulse may disappear.

JP-A-2008-2392

An object of the present disclosure is to provide an igniter capable of suppressing 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 to be grounded, a switch element connected between the output terminal and the ground terminal, and the switch element. and the ground terminal; an input terminal for inputting an ignition instruction signal from an engine control device; and a control circuit for driving the switch element based on the ignition instruction signal. The control circuit includes a reference voltage resistor, one terminal of which is connected to a low potential side terminal of the current detection resistor and generates a reference voltage, and 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 comparison result between the voltage input to the detection voltage input terminal and the voltage input to the reference voltage input terminal. a comparator provided with a comparison result output terminal for outputting a signal; and a capacitor connected between the previous detection voltage input terminal and the reference voltage input terminal. It is characterized by generating an ignition confirmation signal to be output.

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 below with reference to the accompanying drawings.

1 is a block diagram showing the overall configuration of a vehicle including an igniter according to a first embodiment of the present disclosure; FIG. FIG. 2 is a circuit diagram showing details of an internal configuration of an ignition confirmation unit of the igniter of FIG. 1; 4 is a circuit diagram showing a configuration example of a comparator; FIG. 2 is a plan view showing an example of layout of a functional IC of the control circuit of the igniter of FIG. 1; FIG. 5 is a partially enlarged plan view showing details of a portion of the layout of FIG. 4; FIG. 2 is a plan view showing an example layout of the internal configuration of the igniter of FIG. 1; FIG. FIG. 2 is an operation waveform diagram of the igniter of FIG. 1; FIG. 7 is a partially enlarged plan view of the layout of the functional IC of the igniter control circuit according to the second embodiment of the present disclosure; 1 is a circuit diagram showing a conventional igniter; FIG. It is an operation waveform diagram of a conventional igniter, (a) is an operation waveform diagram when noise is not superimposed, and (b) is an operation waveform diagram when noise is superimposed.

Preferred embodiments of the present disclosure will be specifically described below with reference to the drawings.

<First Embodiment>
1-7 show an example of an igniter according to the present disclosure. FIG. 1 is a block diagram showing the overall configuration of a vehicle A equipped with an igniter 1 of this embodiment. A 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, they are omitted in FIG. 1 .

The ECU 2 is an electronic control unit for controlling the operation of the engine, and is realized by a microcomputer having a CPU and memory. The ECU 2 generates an ignition instruction signal IGT that instructs 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 has 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 discharges to explode the air-fuel mixture in the engine.

The igniter 1 controls discharge of the spark plug 3 based on an 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 the current Ic to flow through the primary coil 41 while the ignition instruction signal IGT is at high level. The igniter 1 cuts off the current Ic flowing through the primary coil 41 at the timing when the ignition instruction signal IGT switches from high level to low level. As a result, a back electromotive force of several hundred volts is generated in the primary coil 41 . At this time, a high voltage of, for example, several tens of kV is generated in the secondary coil 42 by multiplying the voltage on the primary side by the turns ratio. The spark plug 3 discharges due to the high voltage applied from the secondary coil 42 .

The igniter 1 has a power supply terminal VDD, a ground terminal GND, an input terminal IN, an output terminal OUT, and a feedback terminal FB. A power supply terminal VDD is connected to the battery 5 and supplied with a power supply voltage. A ground terminal GND is grounded. The input terminal IN is connected to the ECU 2 via a harness (not shown) and receives an ignition instruction signal IGT from the ECU 2 . An output terminal OUT is connected to the primary coil 41 of the ignition coil 4 . A 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 also 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 and off by the control circuit 13 to switch between conduction and non-conduction between the output terminal OUT and the ground terminal GND. A collector terminal of the switch element 11 is connected to the primary coil 41 of the ignition coil 4 via the output terminal OUT. An emitter terminal of the switch element 11 is grounded via a ground terminal GND. A gate terminal of the switch element 11 is connected to the control circuit 13 . The switch element 11 is turned on and off according to a gate drive signal input from the control circuit 13 to the gate terminal. Note that the switch element 11 is not limited to an 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. Note that the resistor connected in series to the ground terminal GND side of the resistor 12 in FIG. 1 represents the parasitic resistance of a lead 402 (a lead having a ground terminal GND), which will be 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 across the terminals of the current detection resistor 12 . The resistance value of the current detection resistor 12 is, for example, several mΩ to several tens of mΩ. Therefore, even if the current Ic flowing through the current detection resistor 12 is several amperes to ten and several amperes, the detection voltage Vcs can be suppressed to several mV to several hundred mV. In this embodiment, the current detection resistor 12 is a resistance component of a bonding wire arranged in the 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 may be a resistor integrated into a functional IC of the control circuit 13, which will be described later.

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

Control circuit 13 includes power pad 201 , ground pad 202 , input pad 203 , gate output pad 204 , feedback output pad 205 , sense input pad 206 and sense ground pad 207 . Power supply pad 201 is connected to power supply terminal VDD, and ground pad 202 is connected to ground terminal GND. Input pad 203 is connected to input terminal IN, gate output pad 204 is connected to the gate terminal of switch element 11, and feedback output pad 205 is connected to feedback terminal FB. The sense input pad 206 is connected to the high potential side terminal of the current detection resistor 12 . The sense ground pad 207 is connected to the terminal of the current detection resistor 12 on the low potential side. The control circuit 13 also includes a driving section 133 and an ignition confirmation section 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 according to 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 it to the comparator. The comparator compares the ignition instruction signal IGT from which high-frequency noise has been removed with a threshold to determine the level (high level or low level). The comparator outputs the determination result to the delay circuit as a determination signal. The delay circuit gives a predetermined delay to the decision signal and outputs it to the driver. Based on the determination signal, the driver generates and outputs a gate drive signal of a level capable of driving the switch element 11 . The drive unit 133 turns on the switch element 11 while the ignition instruction signal IGT is at high level, and turns off the switch element 11 while the ignition instruction signal IGT is at low level. When the ignition instruction signal IGT switches from high level to low level, the switch element 11 switches from on to off. As a result, a high voltage is generated in the secondary coil 42 of the ignition coil 4 and 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 . Ignition confirmation unit 134 generates ignition confirmation signal IGF by comparing current Ic with reference currents Iref1 and Iref2 (>Iref1). Actually, the ignition confirmation unit 134 detects the voltage across the terminals of the current detection resistor 12 (detection voltage Vcs) as a reference voltage Vref1 corresponding to the reference current Iref1 and a reference voltage Vref2 (>Vref1) corresponding to the reference current Iref2. ) to generate an ignition confirmation signal IGF. Ignition confirming unit 134 goes to the first level (for example, low level) when the detected voltage Vcs is between the reference voltage Vref1 and the reference voltage Vref2 (Vref1<Vc<Vref2), otherwise (Vc <Vref1, Vref2<Vc), a second level (for example, high level) signal is generated and output to the ECU 2 as an ignition confirmation signal IGF. The first level may be high level and the second level may be low level.

FIG. 2 is a circuit diagram showing the details of the internal configuration of the ignition confirmation unit 134. As shown in FIG. 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 logical operation unit 101 and an output transistor 102 .

The first comparison unit 110 compares the detected 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. A resistor R11 is a resistor for setting a reference voltage Vref1. A comparator 111 compares the detected voltage Vcs with a reference voltage Vref1. A non-inverting input terminal of comparator 111 is connected to sense input pad 206 . The inverting input terminal of comparator 111 is connected to sense ground pad 207 through resistor R11. The output terminal of the comparator 111 is connected to the logical operation section 101 and outputs the comparison result between the detection voltage Vcs and the reference voltage Vref1. The comparator 111 outputs a comparison signal S11 that goes high when the detected voltage Vcs is higher than the reference voltage Vref1 (Vcs>Vref1) and goes low when the detected voltage Vcs is lower than the reference voltage Vref1 (Vcs<Vref1). . Note that the 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, non-inverting input terminal, inverting input terminal, and output terminal correspond to the "comparator", "detection voltage input terminal", "reference voltage input terminal", and "comparison result output terminal" of the present invention, respectively. Equivalent to.

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

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

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

A capacitor C11 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 111 . Capacitor C11 has a capacitance of, for example, about 0.1 to 100 pF. In this embodiment, the capacitor C11 is formed by connecting two capacitors of about 0.05 to 50 pF in parallel. Note that the capacitor C11 may be three or more capacitors connected in parallel, or may be one capacitor. The capacitor C11 smoothes the voltage between the terminals, so that the voltage input to the non-inverting input terminal (detected voltage Vcs with noise superimposed) and the voltage input to the inverting input terminal (reference voltage with noise superimposed Suppress the phase difference with Vref1). 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 . Note that 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 resistor R12 and the resistance value of R13 are approximately the same, for example, approximately 100Ω to 10 kΩ. The resistor R12 and the capacitor C11 form an RC filter that removes high frequencies input to the non-inverting input terminal of the comparator 111 . Also, the resistor R13 and the capacitor C11 form an RC filter that removes high frequencies input to the inverting input terminal of the comparator 111 . Capacitor C 11 and resistors R 12 and R 13 remove high frequency noise input to each input terminal of comparator 111 . The cut-off frequency of the RC filter composed of the capacitor C11 and the resistors R12 and R13 is higher than the frequency component (several tens to several hundred Hz) of the waveform of the detected voltage Vcs during normal operation, and the frequency of the noise to be removed (radio 1 MHz) at the reception impairment BCI). Therefore, the cutoff frequency is preferably several hundred Hz to several tens of kHz. Since the resistance value of the resistor R12 and the resistance value of the resistor 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, by comparing the voltage input to the non-inverting input terminal and the voltage input to the inverting input terminal, the detection voltage Vcs and the reference voltage Vref1 can be compared. The resistor R12 and the resistor R13 respectively correspond to the "first resistor" and "second resistor" of the present invention.

The second comparison unit 120 compares the detected voltage Vcs with the reference voltage Vref2. The second comparison section 120 includes a comparator 121, a resistor R21, a capacitor C21, and resistors R22 and R23. A resistor R21 is a resistor for setting the reference voltage Vref2. Comparator 121 compares detection voltage Vcs with reference voltage Vref2. A non-inverting input terminal of comparator 121 is connected to sense input pad 206 . The inverting input terminal of comparator 121 is connected to sense ground pad 207 through resistor R21. The output terminal of the comparator 121 is connected to the logical operation section 101 and outputs the comparison result between the detection voltage Vcs and the reference voltage Vref2. The comparator 121 outputs a comparison signal S12 that goes high when the detected voltage Vcs is higher than the reference voltage Vref1 (Vcs>Vref2) and goes low when the detected voltage Vcs is lower than the reference voltage Vref2 (Vcs<Vref2). . 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 the "second comparator", the "second detection voltage input terminal", the "second reference voltage input terminal", and the " "second comparison result output terminal".

A capacitor C21 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 121 . The capacitor C21 is similar to the capacitor C11 of the first comparison section 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 . Note that 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 resistor R22 and the resistance value of R23 are approximately the same. The resistors R22 and R23 are similar to the resistors R12 and R13 of the first comparison section 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 outputs an operation result signal S15 indicating the operation result. to output A logical operation unit 101 performs a logical product operation between 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 low level (Vcs<Vref1), the logic operation section 101 sets the operation result signal S15 at low level. Further, when the comparison signal S11 is at high level and the comparison signal S12 is at low level (Vref1<Vcs<Vref2), the logic operation section 101 sets the operation result signal S15 at high level. Further, when both the comparison signal S11 and the comparison signal S12 are at high level (Vcs>Vref2), the logic operation section 101 sets the operation result signal S15 at low level. That is, the operation result signal S15 is at high level only during the period in which the comparison signal S11 is at high level and the comparison signal S12 is at low level (Vref1<Vcs<Vref2). Note that the logical operation unit 101 is not limited, and may be designed according to the combination of high level and 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 output transistor 102 is connected to feedback terminal FB via feedback output pad 205 . The source terminal of output transistor 102 is grounded. The gate terminal of the output transistor 102 receives the operation result signal S15 from the logic operation section 101 . When the calculation result signal S15 is at high level, the ignition confirmation signal IGF is at low level, and when the calculation result signal S15 is at low level, the ignition confirmation signal IGF is at high level. A feedback terminal FB is connected to the ECU 2 via a harness. The ECU 2 detects whether the igniter 1 is operating normally based on the ignition confirmation signal IGF input from the feedback terminal FB.

Third comparison unit 130 detects that current Ic has reached first upper limit current Iref3 by comparing current Ic with first upper limit current Iref3 (>Iref2). Actually, the third comparison unit 130 compares the detected voltage Vcs with the reference voltage Vref3 (>Vref2) corresponding to the first upper limit current Iref3. The third comparing section 130 includes a comparator 131, a resistor R31, a capacitor C31, and resistors R32 and R33. A resistor R31 is a resistor for setting a reference voltage Vref3. Comparator 131 compares detection voltage Vcs with reference voltage Vref3. A non-inverting input terminal of comparator 131 is connected to sense input pad 206 . The inverting input terminal of comparator 131 is connected to sense ground pad 207 through resistor R31. The output terminal of the comparator 131 is connected to a current limiting section (not shown) of the drive section 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 goes high when the detected voltage Vcs is higher than the reference voltage Vref3 (Vcs>Vref3) and goes low when the detected voltage Vcs is lower than the reference voltage Vref3 (Vcs<Vref3). . Note that 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 the "third comparator", the "third detection voltage input terminal", the "third reference voltage input terminal", and the " "third comparison result output terminal".

A capacitor C31 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 131 . The capacitor C31 is similar to the capacitor C11 of the first comparison section 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 . Note that 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 resistor R32 and the resistance value of R33 are approximately the same. The resistors R32 and R33 are similar to the resistors R12 and R13 of the first comparison section 110, respectively, 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). In practice, the fourth comparison unit 140 compares the detected voltage Vcs with the reference voltage Vref4 (<Vref3) corresponding to the second upper limit current Iref4. The fourth comparison section 140 includes a comparator 141, a resistor R41, a capacitor C41, and resistors R42 and R43. A resistor R41 is a resistor for setting a reference voltage Vref4. Comparator 141 compares detection voltage Vcs with reference voltage Vref4. A non-inverting input terminal of comparator 141 is connected to sense input pad 206 . The inverting input terminal of comparator 141 is connected to sense ground pad 207 through resistor R41. The output terminal of the comparator 141 is connected to a current limiting section (not shown) of the driving section 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 becomes high level when the detection voltage Vcs is greater than the reference voltage Vref4 (Vcs>Vref4) and becomes 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. Further, the comparator 141, the non-inverting input terminal, the inverting input terminal, and the output terminal are respectively the "third comparator", the "third detection voltage input terminal", the "third reference voltage input terminal", and the " "third comparison result output terminal".

A capacitor C41 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 141 . The capacitor C41 is similar to the capacitor C11 of the first comparing section 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 . Resistor R43 has one terminal connected to resistor R41 and the other terminal connected to sense ground pad 207 . Note that one terminal of the resistor R43 may be connected to the inverting input terminal of the comparator 141 and the other terminal may be connected to the resistor R41. The resistance value of resistor R42 and the resistance value of R43 are approximately the same. The resistors R42 and R43 are similar to the resistors R12 and R13 of the first comparison section 110, respectively, 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 driving unit 133 controls the current during the ON period of the gate terminal of the switch element 11. limit the voltage of Thereby, the current Ic flowing through the switch element 11 is limited. The current limiter 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 high level. Further, when the ON state of the switch element 11 continues for a predetermined period of time, the current limiter controls the current during the ON period of the gate terminal of the switch element 11 based on the comparison signal S14 (when the comparison signal S14 is at high level). By limiting the voltage, the current Ic is limited to the second upper limit current Iref4.

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

FIG. 4 is a plan view showing an example layout of the functional ICs of the control circuit 13. As shown in FIG. The control circuit 13 has a semiconductor substrate 200 . Power supply pad 201 , ground pad 202 , input pad 203 , gate output pad 204 , feedback output pad 205 , sense input pad 206 and sense ground pad 207 of control circuit 13 are arranged on semiconductor substrate 200 . Further, each functional element constituting the driving section 133 and the ignition checking section 134 of the control circuit 13 is formed on the semiconductor substrate 200 . In FIG. 4, the thickness direction (planar view direction) of the semiconductor substrate 200 is defined as the z direction (z1-z2 direction), and the direction along one side of the semiconductor substrate 200 orthogonal to the z direction (horizontal direction in FIG. 4). are described as the x-direction (x1-x2 direction), and the z-direction and the direction perpendicular to the x-direction (vertical direction in FIG. 4) are defined as the y-direction (y1-y2 direction) (the same applies to FIG. 5). The x-direction corresponds to the "first direction" of the invention, and the y-direction corresponds to the "second direction" of the invention.

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

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

A region 310 is a region in which 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. FIG. 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. Region 310 is also adjacent to sense input pad 206 and sense ground pad 207 in the y-direction. The region 310 is entirely located on the side of the sense input pad 206 and the sense ground pad 207 (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 comparing section 110, wiring from sense input pad 206 to resistor R12 and wiring from sense ground pad 207 to resistor R13 are connected. wiring can be shortened. The same applies to the second comparing section 120, the third comparing section 130 and the fourth comparing section 140. FIG.

FIG. 5 is a partially enlarged plan view showing details of region 310. As shown in FIG. Region 310 includes region 311 , region 312 , region 313 , region 314 and region 315 .

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

A region 312 is a region where capacitors C11, C21, C31 and C41 are formed. The region 312 is arranged adjacent to the region 311 on the x2 direction side. As described above, the capacitors C11, C21, C31 and C41 are each two capacitors connected in parallel, and the area 312 is formed with eight capacitors. Since the region 312 is adjacent to the region 311, the wiring connecting the capacitor C11 and the resistor R12 can be shortened in the first comparison unit 110, for example. Further, when the resistor R13 is arranged 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 comparing section 120, the third comparing section 130 and the fourth comparing section 140. FIG.

A region 313 is a region in which two transistors (transistors TR1 and TR2 in FIG. 3) of the differential input section included in the comparators 111, 121, 131 and 141 are formed. The region 313 is arranged adjacent to the region 312 in the x2 direction. Eight transistors are formed in region 313 . Since the region 313 is adjacent to the region 312, the wiring connecting the comparator 111 and the capacitor C11 can be shortened in the first comparing section 110, for example. The same applies to the second comparing section 120, the third comparing section 130 and the fourth comparing section 140. FIG. Also, region 313 is located near region 311 . Therefore, for example, in the first comparing section 110, the wiring connecting the comparator 111 and the resistor R12 can be shortened. Further, when the resistor R13 is arranged 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 comparing section 120, the third comparing section 130 and the fourth comparing section 140. FIG.

A region 314 is a region in which protective diodes (not shown in FIG. 3) included in the comparators 111, 121, 131, and 141 are formed. The region 314 is arranged adjacent to the region 313 on the x2 direction side. Four diodes are formed in region 314 . In this embodiment, two diodes are formed at the y1 direction end of the region 314 and two diodes are formed at the y2 direction end of the region 314 . The region 314 also includes a region 314a in which no functional element is formed in the center in the y direction.

Region 315 is a region formed with resistors (resistors R1 and R2 in FIG. 3) for limiting external surge current from sense input pad 206 and sense ground pad 207 included in comparators 111, 121, 131 and 141. is. The region 315 is arranged adjacent to the region 314 on the x2 direction side. In the region 315, a plurality of resistors with different resistance values are connected in parallel and formed for each comparator. Only one of the resistors connected in parallel is actually used. Other resistors will be disconnected and will not function. Region 314a is free of functional elements so as not to interfere with the cutting operation. The area including the areas 313, 314 and 315 corresponds to the "comparator forming area" of the present invention.

The resistors R12, R13, R22, R23, R32, R33, R42, and R43 formed in the region 311 tend to generate heat by consuming noise. Also, the first comparison section 110, the second comparison section 120, the third comparison section 130, and the fourth comparison section 140 formed in the region 310 are susceptible to external noise. Therefore, in the present embodiment, in order to suppress the effects of heat and external noise on functional elements formed in other regions, the region 310 is located at the center of the semiconductor substrate 200 and surrounded by other regions. It is arranged on the semiconductor substrate 200 at a position as close to the periphery as possible.

Returning to FIG. 4, a region 321 is a region in which resistors R11, R21, R31, and R41 for setting reference voltages for each comparator to compare with the detection voltage Vcs are formed. These resistors can be adjusted in resistance by laser trimming in order to adjust the reference voltage. The region 321 is arranged adjacent to the region 310 on the x2 direction side. A region 322 is a region in which the logical operation unit 101 and the output transistor 102 are formed in the ignition confirmation unit 134 . A region 323 is a region where a protection circuit is formed to protect the control circuit 13 from surges and noises input from the feedback output pad 205 .

A region 331 is a region where a protection circuit is formed to protect the control circuit 13 from surges and noises input from the input pad 203 . A region 332 is a region in which a high-frequency filter, a comparator, a delay circuit, and the like are formed in the drive section 133 . A region 333 is a region where an oscillation circuit for generating an internal clock, a timer, and the like are formed. A region 334 is a region in which logic circuits are formed. A region 335 is a region in which a driver of the drive unit 133 and the like are formed.

A region 341 is a region where an internal power supply for the control circuit 13 is formed. A region 342 is a region where a circuit for generating an internal reference voltage for the control circuit 13 is formed. A region 351 is a region where a protection circuit is formed to protect the control circuit 13 from surges and noises input from the power supply pad 201 and the ground pad 202 . A region 361 is a region where test pads are formed. Note that the layout of the functional ICs of the control circuit 13 is not limited to those shown in FIGS. 4 and 5. FIG.

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

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

Leads 402-408 each have a hole 400a therethrough. When the holes 400a are covered with the sealing resin, the holes 400a are also filled with the sealing resin. Further, each of the leads 401 to 408 has a groove 400b 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 that is applied in order to protect the junction point of the bonding wire to the lead in the step before being covered with the sealing resin.

A semiconductor substrate 200 in which the control circuit 13 is integrated is mounted on the lead 402 . Power pad 201 is connected to lead 407 by bonding wire 501 . Ground pad 202 is connected to lead 402 (ground terminal GND) by bonding wire 502 . Input pad 203 is connected to lead 403 (input terminal IN) by bonding wire 503 . Gate output pad 204 is connected by bonding wire 504 to pad 602, which will be described later. Feedback output pad 205 is connected to lead 405 (feedback terminal FB) by bonding wire 505 . Sense input pad 206 is connected to lead 406 by bond wire 506 . Sense ground pad 207 is connected to lead 402 by bond wire 507 . Bonding wires 501 to 507 are made of Al, for example. The bonding wires 501 to 507 may be made of other metals such as Al alloy, Au, and 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 backside electrode 603 . A semiconductor substrate 600 is a substrate on which a p-type semiconductor layer and an n-type semiconductor layer are formed for forming a switch element 11 such as an IGBT. Pad 601 is the emitter electrode. Pad 602 is a gate electrode. The back electrode 603 is a collector electrode. The pads 601 and 602 are arranged on the surface of the semiconductor substrate 600 (the surface on the front side of the paper surface of FIG. 6). A back surface electrode 603 is arranged on the back surface of the semiconductor substrate 600 . The semiconductor substrate 600 (switch element 11 ) is mounted so 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. Pad 601 is connected to lead 402 by bond wire 509 , lead 406 and bond wire 508 . Thereby, the emitter terminal of the switch element 11 is connected to the ground terminal GND. Pad 602 is connected to gate output pad 204 by bond 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 this embodiment, pad 601 is not directly connected to lead 402 (ground terminal GND) by a bonding wire, but is connected to lead 406 by bonding wire 509 . Lead 406 is connected to lead 402 (ground terminal GND) by bonding wire 508 and to sense input pad 206 by 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 Al, for example. The bonding wires 508 and 509 may be made of other metals such as Al alloy, Au, and Cu. The resistance component of the bonding wire 508 is used for the current detection resistor 12 .

The igniter 1 includes a high-frequency filter (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 comprising capacitors 14 and 16 and resistor 15 . Resistor 15 is bridge-connected between lead 401 (power supply terminal VDD) and lead 407 . Capacitor 14 is bridge-connected between lead 401 and lead 402 (ground terminal GND). Capacitor 16 is bridge-connected between lead 407 and lead 402 (ground terminal GND). Lead 407 is connected to power supply pad 201 of control circuit 13 by bonding wire 501 . This forms a high-frequency filter that removes high-frequency noise input from the power supply terminal VDD.

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

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

According to this embodiment, in the first comparing section 110, the capacitor C11 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 111. FIG. The capacitor C11 smoothes the voltage between the terminals, so that the voltage input to the non-inverting input terminal (detected voltage Vcs with noise superimposed) and the voltage input to the inverting input terminal (reference voltage with noise superimposed Suppress the phase difference with Vref1). Therefore, since the phase of the high-frequency fluctuation of the reference voltage Vref1 and the phase of the high-frequency fluctuation of the detection voltage Vcs match, the deterioration of the judgment capability of the comparator 111 is suppressed, and the overdrive voltage is lowered. Therefore, an increase in the reference voltage Vref1 is suppressed. The same applies to the second comparison section 120, and the phase difference of noise is suppressed by connecting the capacitor C21 between the non-inverting input terminal and the inverting input terminal of the comparator 121. FIG. Therefore, an increase in the reference voltage Vref2 is suppressed. Therefore, the comparators 111 and 121 can make the same determination as when noise is not superimposed. As a result, disturbance of the ignition confirmation signal IGF due to noise can be suppressed.

FIG. 7 is an operation waveform diagram of the igniter 1. FIG. In FIG. 7, although noise is superimposed, the voltage input to the non-inverting input terminal (detection voltage Vcs with noise superimposed) and the voltage input to the inverting input terminal are controlled by capacitors C11 and C12. By suppressing the phase difference from (the reference voltage Vref1 on which noise is superimposed), the rise of the reference voltages Vref1 and Vref2 is suppressed. Therefore, the ignition confirmation signal IGF has the same waveform as when noise is not superimposed. In other words, disturbance of the ignition confirmation signal IGF due to noise can be suppressed.

Further, according to the present embodiment, the capacitor C31 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 131 in the third comparing section 130 as well. As a result, the phase difference of noise is suppressed, and the voltage that rises due to 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 noise is not superimposed. The same is true for the fourth comparison section 140 , and a capacitor C<b>41 is connected between the non-inverting input terminal and the inverting input terminal of the comparator 141 . As a result, the phase difference of noise is suppressed, and the voltage that rises due to noise becomes approximately the same between the detection voltage Vcs and the reference voltage Vref4. Therefore, the comparator 141 can output the same comparison signal S14 as when noise is not superimposed.

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

Also, according to this embodiment, the sense input pad 206 and the sense ground pad 207 are arranged at the end in the y1 direction. Therefore, it is convenient to bond a bonding wire to a member located in the y1 direction of the semiconductor substrate 200. FIG. Also, sense input pad 206 and sense ground pad 207 are longer in the y dimension than in the x dimension. Therefore, it is easy to perform bonding with the bonding wire directed in the y direction.

Also according to this embodiment, region 310 is located near sense input pad 206 and sense ground pad 207 . For example, in first comparison unit 110, the wiring from sense input pad 206 to resistor R12 and the wiring from sense ground pad 207 to 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.

Also according to this embodiment, region 311 is equidistant from sense input pad 206 and sense ground pad 207 . For example, in the first comparison unit 110, since the resistors R12 and 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 separated from each other. , are formed to the same length. This can suppress the difference in parasitic inductance 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 this embodiment, the region 312 is adjacent to the region 311 and the region 313 is adjacent to the region 312 . Then, for example, in the first comparison section 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 this embodiment, the region 314 includes a region 314a in which no functional element is formed in the center in the y direction. As a result, the workability of cutting the wiring of the resistance formed in the region 315 is improved.

FIG. 8 shows another embodiment of the present disclosure. In FIG. 8, elements identical or similar to those in the above embodiment are denoted by the same reference numerals as 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. FIG. The igniter 1 of this embodiment differs from the embodiment described above in the method of arranging the four diodes in the region 314 .

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

The igniter and vehicle according to the present disclosure are not limited to the embodiments described above. The igniter according to the present disclosure and the specific configuration of each part of the vehicle 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 for receiving an ignition instruction signal from an engine control device;
a control circuit that drives the switch element based on the ignition instruction signal;
with
The control circuit is
a reference voltage resistor having one terminal connected to the low potential side terminal of the current detection resistor and generating a reference voltage;
a detection voltage input terminal connected to the 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 the voltage input to the reference voltage input terminal;
a capacitor connected between the previous detection voltage input terminal and the reference voltage input terminal;
with
generating an ignition confirmation signal to be output to the engine control device based on the comparison result signal;
An igniter characterized by:
[Appendix 2]
The capacitance of the capacitor is 0.1 to 100 pF,
The igniter of 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 area where the comparator is formed and the area where the capacitor is formed are adjacent,
The igniter of Appendix 3.
[Appendix 5]
The control circuit is
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 arranged and in a second direction perpendicular to the thickness direction of the semiconductor substrate. placed in the
The igniter of 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 of Appendix 5.
[Appendix 7]
a region in which the comparator is formed is positioned between the first pad and the second pad in the first direction;
An igniter according to Appendix 5 or 6.
[Appendix 8]
The area where the comparator is formed is on the first pad side and the second pad side from the center of the semiconductor substrate in the second direction.
8. An igniter according to any one of appendices 5-7.
[Appendix 9]
The control circuit is
a first resistor connected between the 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
9. An igniter according to any one of clauses 5-8.
[Appendix 10]
The first resistor and the second resistor are arranged adjacent to each other and have approximately the same resistance value.
The igniter of Appendix 9.
[Appendix 11]
the region where the first resistor and the second resistor are formed and the region where the capacitor is formed are adjacent;
11. The igniter according to Appendix 9 or 10.
[Appendix 12]
the center position in the first direction of the region where the first resistor and the second resistor are formed is the center between the edges of the first pad and the second pad facing each other in the first direction;
12. An igniter according to any one of clauses 9-11.
[Appendix 13]
The control circuit is
a second reference voltage resistor having one terminal connected to the low potential side terminal of the current detection resistor and generating a second reference voltage;
A second detection voltage input terminal connected to the 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 the voltage input to the input terminal and the 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;
13. The igniter of any one of Appendixes 1-12.
[Appendix 14]
The control circuit is
a third reference voltage resistor having one terminal connected to the low potential side terminal of the current detection resistor and generating a third reference voltage;
a third detection voltage input terminal connected to the 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 the voltage input to the input terminal and the voltage input to the third reference voltage input terminal;
a third capacitor connected between the pre-detection third output voltage input terminal and the third reference voltage input terminal;
with
adjusting the drive of the switch element based on the third comparison result signal;
14. The igniter of any one of Appendixes 1-13.
[Appendix 15]
an igniter according to any one of Appendices 1 to 14;
a spark plug and
an ignition coil comprising a primary coil connected to the output terminal and a secondary coil connected to the ignition plug;
an engine control device that generates the ignition instruction signal and outputs it to the igniter;
A vehicle characterized by comprising:

1: igniter 11: switch element 12: current detection resistor 13: control circuit 133: drive unit 134: ignition confirmation unit 101: logic operation unit 102: output transistor 110: first comparison unit 111: comparators R11, R12, R13: Resistor C11: Capacitor 120: Second comparison unit 121: Comparators R21, R22, R23: Resistor C21: Capacitor 130: Third comparison unit 131: Comparators R31, R32, R33: Resistor C31: Capacitor 140: Fourth comparison unit 141: Comparator R41, R42, R43: Resistor C41: Capacitor CS1-CS3: Current source R1, R2: Resistor TR1-TR3: Transistor 200: Semiconductor substrate 201: Power supply pad 202: Grounding pad 203: Input pad 204: Gate output pad 205: Feedback output pad 206: Sense input pad 207: Sense ground pad 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 substrate 601, 602 : Pad 603 : Rear electrode 14 : Capacitor 15 : Resistor 16 : Capacitor 2 : ECU
3: spark plug 4: ignition coil 41: primary coil 42: secondary coil 5: battery A: vehicle

Claims (13)

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 for receiving an ignition instruction signal from an engine control device;
a control circuit that drives the switch element based on the ignition instruction signal;
with
The control circuit is
a reference voltage resistor having one terminal connected to the low potential side terminal of the current detection resistor and generating a reference voltage;
a detection voltage input terminal connected to the 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 the voltage input to the reference voltage input terminal;
a capacitor connected between the detection voltage input terminal and the reference voltage input terminal;
a semiconductor substrate on which the reference voltage resistor, the comparator and the capacitor are integrated;
with
generating an ignition confirmation signal to be output to the engine control device based on the comparison result signal ;
In the semiconductor substrate, the area where the comparator is formed and the area where the capacitor is formed are adjacent to each other,
An igniter characterized by: 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 for receiving an ignition instruction signal from an engine control device;
a control circuit that drives the switch element based on the ignition instruction signal;
with
The control circuit is
a reference voltage resistor having one terminal connected to the low potential side terminal of the current detection resistor and generating a reference voltage;
a detection voltage input terminal connected to the 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 the voltage input to the reference voltage input terminal;
a capacitor connected between the detection voltage input terminal and the reference voltage input terminal;
a semiconductor substrate on which the reference voltage resistor, the comparator and the capacitor are integrated;
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;
with
generating an ignition confirmation signal to be output to the engine control device based on the comparison result signal ;
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 arranged and in a second direction perpendicular to the thickness direction of the semiconductor substrate. placed in the
An igniter characterized by: the first pad and the second pad have a dimension in the second direction longer than a dimension in the first direction;
3. The igniter of claim 2 . a region in which the comparator is formed is positioned between the first pad and the second pad in the first direction;
4. An igniter according to claim 2 or 3 . The area where the comparator is formed is on the first pad side and the second pad side from the center of the semiconductor substrate in the second direction.
An igniter according to any one of claims 2 to 4 . The control circuit is
a first resistor connected between the 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
6. An igniter as claimed in any one of claims 2 to 5 . 7. The igniter according to claim 6 , wherein said first resistor and said second resistor are arranged adjacent to each other and have approximately the same resistance value. the region where the first resistor and the second resistor are formed and the region where the capacitor is formed are adjacent;
8. An igniter according to claim 6 or 7 . the center position in the first direction of the region where the first resistor and the second resistor are formed is the center between the edges of the first pad and the second pad facing each other in the first direction;
9. An igniter as claimed in any one of claims 6 to 8 . The capacitance of the capacitor is 0.1 to 100 pF,
10. An igniter as claimed in any one of claims 1 to 9 . The control circuit is
a second reference voltage resistor having one terminal connected to the low potential side terminal of the current detection resistor and generating a second reference voltage;
A second detection voltage input terminal connected to the 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 the voltage input to the input terminal and the 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
11. The igniter according to any one of claims 1 to 10 , wherein said ignition confirmation signal is generated based on said comparison result signal and said second comparison result signal. The control circuit is
a third reference voltage resistor having one terminal connected to the low potential side terminal of the current detection resistor and generating a third reference voltage;
a third detection voltage input terminal connected to the 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 the voltage input to the input terminal and the voltage input to the third reference voltage input terminal;
a third capacitor connected between the pre-detection third output voltage input terminal and the third reference voltage input terminal;
with
adjusting the drive of the switch element based on the third comparison result signal;
12. An igniter as claimed in any preceding claim. an igniter according to any one of claims 1 to 12 ;
a spark plug and
an ignition coil comprising a primary coil connected to the output terminal and a secondary coil connected to the ignition plug;
an engine control device that generates the ignition instruction signal and outputs it to the igniter;
A vehicle characterized by comprising:

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