CN101782038B - Pulse separation circuit for motorcycle igniter - Google Patents

Abstract

The invention discloses a pulse separating circuit for a motorcycle igniter and relates to a motorcycle ignition circuit. The pulse separating circuit mainly comprises a positive pulse processing circuit, a negative pulse processing circuit, two pulse comparison amplifiers, two Schmidt triggers and a discharge circuit. In the pulse separating circuit for the motorcycle igniter, the pulse separating circuit and a motorcycle automatic angle-advancing control circuit are integrated into the same chip, so that the problems of too many peripheral elements, inconvenient debugging, high cost and the like in the universal ignition circuit are solved. Furthermore, in the circuit, pulse separation is realized by adopting the two-stage amplifiers so that the minimum rotary speed (less than 50 r/min) of motorcycle ignition is greatly reduced.

Description

Pulse separation circuit for motorcycle igniter

technical field

The invention relates to the field of electronic technology, in particular to a motorcycle igniter.

Background technique

The igniter is a key component in the motorcycle, which plays an important role in the normal running of the motorcycle and the personal safety of the driver. The pulse separation circuit is a circuit that separates the positive and negative trigger pulses of the igniter into two negative pulses. The separated pulse signals can be used by the motorcycle automatic timing control chip to realize the automatic timing ignition of the motorcycle. The traditional pulse separation circuit for motorcycles uses a triode for pulse separation as shown in Figure 1. However, its pulse separation circuit is realized by separation components, which makes the application circuit of the motorcycle igniter have too many peripheral components, which is inconvenient to debug and has a high cost. Moreover, since the pulse separation is performed by a triode, the conduction voltage of the triode will be positive and negative. The minimum amplitude of the trigger pulse is limited to about 0.7V, which limits the minimum speed of motorcycle ignition (greater than 100r/min).

Patent Document 1 (Patent No.: CN 101169093, Patent Name: A motorcycle timing igniter ASIC and trigger input circuit) also proposes a pulse separation technology, as shown in Figure 1. The pulse sub-circuit described in Patent Document 1 realizes the separation of positive and negative trigger pulses, and integrates the pulse trigger circuit and the motorcycle automatic timing control circuit into the same chip, which reduces the peripheral components of the motorcycle igniter, but Its disadvantages are: because the circuit uses a simple MOS tube to realize pulse separation, the conduction voltage of the MOS tube limits the minimum amplitude of the positive and negative trigger pulses to about 0.8V, which greatly limits the minimum speed of motorcycle ignition (greater than 100r/min).

Contents of the invention

The technical problem to be solved by the present invention is to invent a pulse separation circuit for a motorcycle igniter. By integrating the pulse separation circuit and the motorcycle automatic timing control circuit on the same chip, the problems existing in the general ignition circuit are well solved. There are too many peripheral components, inconvenient debugging, high cost, and the problem of reducing the minimum speed of motorcycle ignition.

The technical scheme adopted by the present invention to solve the above technical problems is that a pulse separation circuit for a motorcycle igniter of the present invention includes: a forward pulse processing circuit, a negative pulse processing circuit, a pulse comparison amplifier Amp1, a pulse comparison amplifier Amp2, a Schmi Special trigger SMIT1 and SMIT2, release channel Bypass,

The input terminal of the positive pulse processing circuit is IN1, and its output terminal is connected to the negative input terminal inn of the pulse comparison amplifier Amp1; the input terminal of the negative pulse processing circuit is IN2, and its output terminal is connected to the positive input terminal of the pulse comparison amplifier Amp2 inp; the positive input terminal of the pulse comparison amplifier Amp1 is grounded, and its output terminal is connected to the input terminal of the Schmitt trigger SMIT1; the negative input terminal of the pulse comparison amplifier Amp2 is grounded, and the output terminal is connected to the input terminal of the Schmitt trigger SMIT2 ; The output terminals out1 and out2 of the Schmitt trigger SMIT1 and SMIT2 are used as two input terminals of the motorcycle automatic timing control circuit; the discharge path Bypass, its positive input terminal is connected to the power supply Vcc, and the negative input terminal is grounded.

The forward pulse processing circuit includes: a diode D1, a diode D2, a resistor R1, a resistor R2 and an enhanced PMOS transistor MP1 used as an input protection circuit, wherein the forward ends of D1 and D2 are respectively connected to both ends of R1, The negative terminals of D1 and D2 are connected to the power supply Vcc, the positive terminal of D1 is used as the input terminal IN1 of the positive pulse processing circuit, the positive terminal of D2 is connected to one end of the resistor R2, and the other end of R2 is the output of the positive pulse processing circuit Terminal Out, the drain of MP1 is connected to the input terminal In, the gate of MP1 is grounded, the source of MP1 is grounded, and the substrate of MP1 is connected to the power supply Vcc.

The negative pulse processing circuit includes: a diode D3, a diode D4, a resistor R3, a resistor R4 and an NMOS transistor MN1 used as an input protection circuit, wherein the positive ends of D3 and D4 are respectively connected to both ends of the resistor R3, and the D3 , The negative end of D4 is connected to the power supply Vcc, the positive end of D4 is connected to one end of R4, the other end of R4 is connected to the output Out, and the positive end of D3 is connected to the input In, which is used as the input end of the negative pulse processing circuit The drains of IN2 and MN1 are connected to the input In, their gates and sources are connected to the ground, and their substrates are grounded.

The pulse comparison amplifiers Amp1 and Amp2 have the same structure, and are all composed of class AB CMOS amplifiers, including:

PMOS tube MP6, PMOS tube MP7, PMOS tube MP8, PMOS tube MP9, PMOS tube MP10 and NMOS tube MN6, NMOS tube MN7, NMOS tube MN8, NMOS tube MN9, wherein the gate of MP6 is used as the positive input terminal inp of Amp2, The gate of MP7 is used as the negative input terminal inn of Amp1, the sources of MP6 and MP7 are connected, and the drain of MP8 is connected, the gate of MP8 is connected to the bias voltage V _bias , the source of MP8 is connected to the power supply V _CC , MN6 The gate and drain of MN7 are connected to the drain of MP6, the gate and drain of MN7 are connected to the drain of MP7, the sources of MN6 and MN7 are grounded, the gate of MN8 is connected to the drain of MN7 The gates are connected, the gate of MN9 is connected to the gate of MN6, the sources of MN8 and MN9 are grounded, the gate and drain of MP9 are connected and connected to the drain of MN8, the gate of MP10 is connected to the gate of MP9 The drain of MP10 is connected to the drain of MN9, the sources of MP9 and MP10 are connected to V _CC , the substrates of MP6, MP7, MP8, MP9, and MP10 are all connected to the power supply V _CC , and the MN6, MN7, MN8, MN9 The substrate is grounded, and the drain of MN9 is used as the output terminal out of the pulse comparison amplifier.

The PMOS transistor MP6 and the PMOS transistor MP7 have different sizes, the width-to-length ratio of MP6 is 15/5, and the width-to-length ratio of MP7 is 20/5.

The described Schmitt triggers SMIT1 and SMIT2 have the same structure, and conventional circuits can be used.

The discharge path Bypass between the power supply and the ground is a conventional circuit.

The pulse separation circuit for the motorcycle igniter of the present invention integrates the pulse separation circuit and the motorcycle automatic timing control circuit on the same chip, which effectively solves the problems of too many peripheral components, inconvenient debugging, and excessive cost in the general ignition circuit. Advanced problem, and because the circuit of the present invention adopts two-stage amplifier to realize pulse separation, greatly reduces the minimum rotating speed (less than 50r/min) of motorcycle ignition. The pulse separation circuit of the present invention has the following advantages:

1. The pulse shaping transistor and limiting Zener diode are integrated, which simplifies the peripheral application circuit, facilitates the debugging of the circuit, improves the reliability of the circuit, and reduces the cost.

2. In the circuit of the present invention, the shaping and amplification of the pulse is realized by the two-stage comparators Amp1 and Amp2. Compared with the traditional triode shaping and amplification, it has a faster speed and greatly improves the ignition accuracy. Moreover, because the comparator's flipping threshold level is as low as 0.3V, the minimum ignition speed of the igniter can be reduced to 50r/min, which is impossible for a general igniter circuit.

3. The circuit of the present invention integrates the discharge path Bypass with the ESD protection diodes of each pin, ensuring that the whole circuit chip has a complete discharge path for any static electricity. Therefore, the possible damage to the internal circuit caused by the transient current of the magneto and high-voltage ignition is effectively suppressed, thereby greatly improving the reliability of the circuit.

Description of drawings

The schematic diagram of the pulse separation circuit for the motorcycle igniter of the prior art of Fig. 1;

Fig. 2 motorcycle igniter of the present invention is used pulse separation circuit electrical schematic diagram;

Fig. 3 is the application figure of pulse separation circuit for motorcycle igniter of the present invention;

Fig. 4 motorcycle igniter of the present invention uses the waveform diagram of pulse separation circuit in practical application;

Fig. 5 electric schematic diagram of forward pulse processing circuit of the present invention;

Fig. 6 is the electric schematic diagram of the negative pulse processing circuit of the present invention;

The circuit diagram of the pulse comparison amplifier Amp1/Amp2 of Fig. 7 of the present invention;

Detailed ways

The implementation of the present invention will be further described below with reference to the accompanying drawings and specific examples. The specific implementation manners of the present invention are not limited to the following description, and are now further described in conjunction with the accompanying drawings.

The circuit diagram of the pulse separation circuit implemented in the present invention is shown in FIG. 2 . It consists of a positive pulse processing circuit, a negative pulse processing circuit, two pulse comparison amplifiers Amp1 and Amp2, two Schmitt triggers SMIT1 and SMIT2, and a discharge path Bypass.

The input terminal of the positive pulse processing circuit is IN1, and its output terminal is connected to the negative input terminal inn of the pulse comparison amplifier Amp1; the input terminal of the negative pulse processing circuit is IN2, and its output terminal is connected to the positive input terminal of the pulse comparison amplifier Amp2 inp; the positive input terminal of the pulse comparison amplifier Amp1 is grounded, and its output terminal is connected to the input terminal of the Schmitt trigger SMIT1; the negative input terminal of the pulse comparison amplifier Amp2 is grounded, and the output terminal is connected to the input terminal of the Schmitt trigger SMIT2 ; The output terminals out1 and out2 of the Schmitt trigger SMIT1 and SMIT2 are used as the two input terminals of the automatic timing control circuit of the motorcycle; out1 and out2 are used as trigger pulses and enter the automatic timing control circuit of the motorcycle for processing, and finally output the ignition pulse OUT . The discharge path Bypass, its positive input terminal is connected to the power supply Vcc, and its negative input terminal is grounded.

During the normal running of the motorcycle, two positive and negative trigger pulses are generated by the inductance coil and pass through IN1 and IN2. The output terminal of device SMIT1 produces a pulse with a falling edge. The negative-going pulse is limited by the negative-going pulse processing circuit, and the trigger pulse is generated by the pulse comparator Amp2, and a falling-edge pulse is generated at the output terminal of the Schmitt trigger SMIT2. These two pulses pass through the automatic timing control circuit of the motorcycle, and then further processed to generate the ignition pulse OUT.

Fig. 3 is an application diagram of the pulse separation circuit for the motorcycle igniter of the present invention. The PC pulse signal generated by the magneto passes through the low-pass filter circuit composed of the resistor R1c and the capacitor C1c to filter part of the high-frequency signal, and then passes through the anti-interference parallel RC network R3c, C3c and R4c, C4c to enter the input terminals IN1 and C4c of the pulse separation circuit respectively. IN2. The pulses input into IN1 and IN2 are limited by the positive pulse processing circuit and the negative pulse processing circuit, and then the pulses are compared and amplified by the comparators Amp1 and Amp2, and then input into the motorcycle automatic timing control circuit through the Schmitt trigger. The process culminates in the generation of control ignition pulses.

Fig. 4 is a waveform diagram of the pulse separation circuit for the motorcycle igniter in practical application. Among them, the PC signal is an input pulse signal generated by the magneto that changes with the rotation speed of the motorcycle, including a positive pulse and a negative pulse, out1 and out2 are the pulse signals separated by the pulse separation circuit, and OUT is the motorcycle The ignition pulse signal output by the automatic timing control circuit of the vehicle. The amplitude of the PC signal increases with the increase of the motorcycle speed. When the motorcycle speed is 50r/min, its peak value is about 300mV, and when the motorcycle speed is 5000r/min, its amplitude is about 15V. The direction pulse signal out1 and negative direction pulse signal out2 and the output ignition pulse OUT are digital logic levels, and the phase of OUT will change linearly between out1 and out2 as the motorcycle speed changes.

The forward pulse processing circuit of the present invention is shown in Fig. 5, and it is made up of conventional input electrostatic protection circuit and MOS transistor MP1, and MP1 has clamping function and electrostatic protection function. Diodes D1 and D2 are used as input protection circuits. The positive terminals of D1 and D2 are respectively connected to both ends of the resistor R1, the negative terminals of D1 and D2 are connected to the power supply Vcc, and the positive terminal of D1 is connected to the input In as a positive pulse The input terminal IN1 of the processing circuit, the positive terminal of D2 is connected to one terminal of the resistor R2, the other terminal of R2 is connected to the output terminal Out, the drain of MP1 is connected to the input terminal, the gate of MP1 is grounded, the source of MP1 is grounded, and the MP1 The substrate is connected to the power supply Vcc.

The circuit provides electrostatic protection for the internal circuit, and at the same time, clamps the input trigger pulse, and the input positive pulse is clamped by the PMOS transistor MP1 to about the conduction voltage V _TP of MP1.

The negative pulse processing circuit is shown in Figure 6, which belongs to the conventional input electrostatic protection circuit. This circuit provides the function of electrostatic protection for the internal circuit. Diodes D3 and D4 are used as input protection circuits. The positive ends of D3 and D4 are respectively connected to both ends of the resistor R3. The negative ends of D3 and D4 are connected to the power supply Vcc. The positive end of D4 is connected to one end of R4. The other end is connected to the output Out, the positive end of D3 is connected to the input In, the drain of MN1 is connected to the input In, its gate and source are connected to the ground, and its substrate is grounded.

The pulse comparison amplifiers Amp1 and Amp2 of the present invention are shown in FIG. 7 . Amp1 and Amp2 have the same structure and are composed of class AB CMOS amplifiers, including: PMOS tubes MP6, MP7, MP8, MP9, MP10, and NMOS tubes MN6, MN7, MN8, MN9, where the gate of MP6 is used as a positive input terminal inp, the gate of MP7 is used as the negative input terminal inn, the sources of MP6 and MP7 are connected, and the drain of MP8 is connected, the gate of MP8 is connected to the bias voltage V _bias , the source of MP8 is connected to the power supply V _CC , The gate and drain of MN6 are connected to the drain of MP6, the gate and drain of MN7 are connected to the drain of MP7, the sources of MN6 and MN7 are grounded, the gate of MN8 is connected to the drain of MN7 The gate of MN9 is connected to the gate of MN6, the sources of MN8 and MN9 are grounded, the gate of MP9 is connected to the drain and connected to the drain of MN8, the gate of MP10 is connected to the gate of MP9 The drain of MP10 is connected to the drain of MN9, the sources of MP9 and MP10 are connected to V _CC , the substrates of MP6, MP7, MP8, MP9, and MP10 are all connected to the power supply V _CC , MN6, MN7, MN8, MN9 The substrate of MN9 is grounded, and the drain of MN9 is used as the output terminal of the pulse comparison amplifier.

Amp1 and Amp2 are based on the conventional two-stage amplifier, and the input differential pair MP7 and MP6 are introduced into the offset. The size of the MOS transistor MP7 is W/L=20μm/5μm, and the size of MP6 is width and length. The ratio is W/L=15 μm/5 μm. An offset is introduced between the input differential pair MP7 and MP6, so that the threshold level of the amplifier flipping is adjusted from about 10mV to 0.3V, which also ensures that when the motorcycle speed is low and the amplitude of the trigger pulse PC is small Ignition control can be performed to increase the minimum ignition speed of the motorcycle. The positive input terminal of Amp1 is grounded, the negative input terminal of Amp2 is grounded, and the positive pulse and negative pulse are compared and amplified by the amplifier to drive the Schmitt trigger of the latter stage.

The Schmitt triggers SMIT1 and SMIT2 of the present invention can adopt conventional Schmitt triggers to improve the anti-interference ability of the whole circuit.

The discharge path Bypass of the present invention can adopt a conventional ESD protection circuit, and the Bypass together with the ESD protection diodes of each pin ensures the integrity of the whole chip for any electrostatic discharge path, thereby improving the reliability of the circuit.

The basic parameters of PMOS and NMOS tubes in the circuit of the present invention are:

The threshold voltage V _T of the enhanced NMOS transistor: 0.45 ~ 0.75V, the voltage between the source and drain V _DS ≥ 18V; the threshold voltage V _T of the enhanced PMOS transistor: -0.6 ~ -0.8V, the voltage between the source and drain V _DS ≥ 18V; The gate oxide thickness of the enhanced NMOS tube and PMOS tube is 45nm. The manufacturing process is a high-voltage 3μm CMOS process.

Claims (6)

1. a kind of motorcycle igniter pulse separation circuit, it is characterized in that, this circuit comprises: forward pulse processing circuit, negative pulse processing circuit, pulse comparison amplifier Amp1, pulse comparison amplifier Amp2, Schmitt trigger SMIT1 and implement Mitte trigger SMIT2, discharge channel Bypass, the input terminal of the positive pulse processing circuit is IN1, and its output terminal is connected to the negative input terminal inn of the pulse comparison amplifier Amp1; the input terminal of the negative pulse processing circuit is IN2, and its output The terminal is connected to the positive input terminal inp of the pulse comparison amplifier Amp2; the positive input terminal of the pulse comparison amplifier Amp1 is grounded, and its output terminal is connected to the input terminal of the Schmitt trigger SMIT1; the negative input terminal of the pulse comparison amplifier Amp2 is grounded, and the output The terminal is connected to the input terminal of the Schmitt trigger SMIT2; the output terminal out1 of the Schmitt trigger SMIT1 and the output terminal out2 of the Schmitt trigger SMIT2 are used as the two input terminals of the automatic timing control circuit of the motorcycle; the discharge path The positive input terminal of the Bypass is connected to the power supply Vcc, the negative input terminal is grounded, and the positive and negative trigger pulses are input into IN1 and IN2. The positive trigger pulse is limited by the positive pulse processing circuit, and then the trigger pulse is generated by the pulse comparison amplifier Amp1. Control the output terminal of the Schmitt trigger SMIT1 to generate a falling edge pulse; the negative trigger pulse is limited by the negative pulse processing circuit, and the trigger pulse is generated by the pulse comparator Amp2 to control the output terminal of the Schmitt trigger SMIT2 Generate a pulse with a falling edge, and pulses with two falling edges pass through the motorcycle automatic timing control circuit to generate an ignition pulse OUT. 2. The pulse separation circuit for a motorcycle igniter according to claim 1, wherein the forward pulse processing circuit comprises: diode D1 and diode D2 as input protection circuits, and the forward ends of diode D1 and diode D2 are respectively Connected to both ends of the resistor R1, the negative terminals of the diode D1 and the diode D2 are connected to the power supply Vcc, the positive terminal of the diode D1 is used as the input terminal IN1 of the forward pulse processing circuit, and the positive terminal of the diode D2 is connected to one terminal of the resistor R2 , the other end of the resistor R2 is connected to the output terminal Out, the drain of the PMOS transistor MP1 is connected to the input terminal, the gate and the source of the PMOS transistor MP1 are grounded, and the substrate of the PMOS transistor MP1 is connected to the power supply Vcc. 3. The pulse separation circuit for a motorcycle igniter according to claim 1, wherein the negative pulse processing circuit comprises diodes D3 and D4 as input protection circuits, and the forward ends of diodes D3 and D4 are respectively It is connected to both ends of the resistor R3, the negative terminals of the diode D3 and the diode D4 are connected to the power supply Vcc, the positive terminal of the diode D4 is connected to one terminal of the resistor R4, the other terminal of the resistor R4 is connected to the output terminal Out, and the positive terminal of the diode D3 As the input terminal IN2 of the negative pulse processing circuit, the drain of the NMOS transistor MN1 is connected to the input terminal, its gate and source are connected to the ground, and its substrate is grounded. 4. The pulse separation circuit for motorcycle igniter according to claim 1, characterized in that, said pulse comparison amplifier Amp1 and pulse comparison amplifier Amp2 have the same structure, and are all made of AB class CMOS amplifiers, including: PMOS tube MP6 , PMOS tube MP7, PMOS tube MP8, PMOS tube MP9, PMOS tube MP10, and NMOS tube MN6, NMOS tube MN7, NMOS tube MN8, NMOS tube MN9, wherein the gate of the PMOS tube MP6 is used as the positive input terminal inp, and the PMOS tube The gate of MP7 is used as the negative input terminal inn, the sources of PMOS transistor MP6 and PMOS transistor MP7 are connected, and are connected with the drain of PMOS transistor MP8, the gate of PMOS transistor MP8 is connected to the bias voltage V _bias , and the gate of PMOS transistor MP8 The source is connected to the power supply V _CC , the gate and drain of the NMOS transistor MN6 are connected, and are connected to the drain of the PMOS transistor MP6, and the gate and drain of the NMOS transistor MN7 are connected, and are connected to the drain of the PMOS transistor MP7 , the sources of NMOS transistor MN6 and NMOS transistor MN7 are grounded, the gate of NMOS transistor MN8 is connected to the gate of NMOS transistor MN7, the gate of NMOS transistor MN9 is connected to the gate of NMOS transistor MN6, and the gate of NMOS transistor MN8 and NMOS transistor MN9 The source of the PMOS transistor MP9 is connected to the drain, and connected to the drain of the NMOS transistor MN8, the gate of the PMOS transistor MP10 is connected to the gate of the PMOS transistor MP9, and the drain of the PMOS transistor MP10 is connected to the drain of the NMOS transistor MP9. The drains of the tube MN9 are connected, the sources of the PMOS tube MP9 and the PMOS tube MP10 are connected to V _CC , the substrates of the PMOS tube MP6, PMOS tube MP7, PMOS tube MP8, PMOS tube MP9, and PMOS tube MP10 are all connected to the power supply V _CC , The substrates of the NMOS transistor MN6 , NMOS transistor MN7 , NMOS transistor MN8 , and NMOS transistor MN9 are grounded, and the drain of the NMOS transistor MN9 serves as the output terminal of the pulse comparison amplifier. 5. The pulse separation circuit for motorcycle igniter according to claim 4, characterized in that, the PMOS tube MP6 and the PMOS tube MP7 have different sizes, the width-to-length ratio of the PMOS tube MP6 is 15/5, and the PMOS tube MP7 The width-to-length ratio is 20/5, an offset is introduced between the input differential pair PMOS transistor MP7 and PMOS transistor MP6, and the threshold level of the amplifier flipping is adjusted to 0.3V. 6. The pulse separation circuit for motorcycle igniter according to claim 2 or 3, characterized in that, the positive pulse signal out1 and the negative pulse signal out2 and the output ignition pulse OUT after the separation of the pulse separation circuit are digital logic circuits. Flat, the phase of OUT changes linearly between out1 and out2 with the change of motorcycle speed.

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