A control system for a switched rectifier for a motorcycle that boosts low-speed current

Abstract

This invention discloses a control system for a motorcycle switching rectifier that boosts low-speed current. The system includes a magneto, a rectifier circuit, and a battery. The control system also includes a rectifier control module, which comprises a start-up unit, a boost unit, a voltage regulation unit, and a thyristor drive unit. The start-up unit disconnects or connects the rectifier control module and the battery based on the magneto's operating state. The boost unit boosts the voltage output from the start-up unit to a set voltage value, which is then used as the control voltage for the thyristor drive unit. The voltage regulation unit compares the output voltage of the rectifier circuit with the set voltage. The thyristor drive unit includes multiple thyristor drive circuits. This solution can output a larger current even when the magneto is rotating at low speeds, thereby expanding the application range of the switching rectifier and improving its economy and reliability.

Description

Technical Field

[0001] This invention relates to the field of motorcycle rectifier technology, and more specifically to a control system for a motorcycle switching rectifier that boosts low-speed current. Background Technology

[0002] From the perspective of utilizing the electrical energy generated by motorcycle magnetos, existing motorcycle rectifiers fall into two categories: short-circuit and switching. Under the condition of an equivalent magneto and vehicle power distribution system, the main characteristic of a short-circuit rectifier is its ability to rectify and output a large current when the magneto is generating electricity at low speeds. Among these, a rectifier with all three-phase bridge rectifier components being MOSFETs has the largest output current. However, the operating mode of a short-circuit rectifier means that the magneto's output current is always at its maximum. A magneto of several hundred watts operates at maximum load for an extended period, acting as the load on the motorcycle engine. Typically, the daily load on a motorcycle is less than 30% of the magneto's nominal power, resulting in poor fuel economy. Increasingly stringent emission policies and growing energy awareness both limit the application of short-circuit rectifiers in gasoline-powered vehicles.

[0003] The main characteristic of a switching rectifier is that it outputs electrical energy according to the demand of the electrical load, resulting in good fuel economy for motorcycles; existing switching rectifiers are shown in the attached image. Figure 1 As shown, the power supply for a thyristor drive is often directly derived from the rectified AC phase line. Taking one phase of the rectifier (such as phase W) as an example, see attached... Figure 2 As shown, if the DC output voltage of the rectifier is 14V, the AC voltage must reach at least 18.9V (14V+VD1+VD2+VR1+VGK5) for the thyristor T5 to be able to conduct; while the short-circuit rectifier only needs the AC voltage to reach 15.2V (14V+2*0.6) to rectify and output. This results in a significantly smaller output current from a switching rectifier compared to a short-circuit rectifier when the magneto is generating power at low speeds. For example, a 36A magneto at 1000rpm can output 12A of current using a short-circuit rectifier, while a switching rectifier outputs less than 8A. Insufficient output current can easily lead to abnormal operation of the entire motorcycle system. In the current technology, in order to apply existing switching rectifiers, motorcycle engineers usually use methods such as off-peak power usage, increasing engine idle speed, and increasing magneto output voltage. However, this brings about problems such as system coordination, idle quietness and fuel consumption, and increased requirements for motor insulation, which further limit the application of switching rectifiers.

[0004] In addition, the power supply for the thyristor drive of existing switching rectifiers is directly taken from the AC line of the magneto. In order to reliably trigger the thyristor of the rectifier to obtain a large output current when the magneto is at low speed (e.g., 700 rpm) and the ambient temperature is -30°C, the current-limiting resistor of the thyristor drive circuit is often made very small. However, this leads to a problem that when the magneto rotates at high speed (e.g., 12000 rpm), the AC voltage increases proportionally, resulting in a 15 to 20-fold increase in the voltage of the rectified drive power supply, and the thyristor trigger current will also increase to more than 100 times. Therefore, in order to improve reliability, the voltage and current parameters of the thyristor drive branch devices are usually selected according to the maximum value. Such a configuration greatly reduces the economic efficiency of the rectifier system, and the overall reliability improvement of the rectifier is also very limited due to the increase in the current and voltage of the drive unit.

[0005] If a switching rectifier could output a current at low speed comparable to that of a short-circuit rectifier, most of the application limitations of switching rectifiers could be eliminated. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is: how to provide a control system for a motorcycle switching rectifier that can output a large current even when the magneto is rotating at low speed, thereby expanding the application range of the switching rectifier and improving its economy and reliability.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A control system for a motorcycle switching rectifier that boosts low-speed current includes a magneto, a rectifier circuit, and a battery. The upper and lower bridge arms of the rectifier circuit are both composed of thyristors. The control system also includes a rectifier control module, which includes a power-on unit, a boost unit, a voltage regulation unit, and a thyristor drive unit.

[0009] The power-on unit is used to disconnect or connect the rectifier control module and the battery according to the working state of the magneto, and the output voltage of the power-on unit is the output voltage of the rectifier circuit;

[0010] The boost unit is used to boost the voltage output by the power-on unit to a set voltage and then use it as the control voltage of the thyristor drive unit;

[0011] The voltage regulation unit is used to compare the relationship between the output voltage of the rectifier circuit and the set voltage. When the output voltage of the rectifier circuit is less than or equal to the set voltage, it outputs a thyristor turn-on signal to the thyristor drive unit, and when the output voltage of the rectifier circuit is greater than the set voltage, it outputs a thyristor turn-off signal to the thyristor drive unit.

[0012] The thyristor driving unit includes multiple thyristor driving circuits, and each of the multiple thyristor driving circuits corresponds one-to-one with a multiple thyristor in the rectifier circuit, so that the thyristor driving circuit can send control signals to the corresponding thyristor.

[0013] This invention provides an independent drive power supply for the thyristor drive unit. A boost unit amplifies the voltage output from the power-on unit to a set voltage, and then outputs this amplified voltage to the thyristor drive unit as its drive power supply. The drive power supply for the thyristor drive unit is connected to a battery, and the boost unit reliably provides sufficient drive voltage to the thyristors in the rectifier circuit within a temperature range of -30°C (this drive voltage can be adjusted as needed, typically between 15 and 25V). Thus, the drive voltage output to the thyristor drive unit is constant and independent of the magneto's AC voltage. This ensures sufficient drive voltage to turn on the thyristors and output a large current even when the magneto is rotating at low speeds. When this control system is applied to a switching rectifier, the switching rectifier can also output a large current at low magneto speeds, thereby expanding the application range of the switching rectifier and reducing the current difference between high and low magneto rotation. This significantly reduces the parameter requirements for the components in the thyristor drive branch, thereby improving the economy and reliability of its use.

[0014] Preferably, the control system further includes a temperature limiting unit, which is used to detect the temperature of the rectifier circuit and reduce the set voltage of the voltage regulating unit when the temperature of the rectifier circuit exceeds the set temperature value, so as to limit the temperature of the rectifier circuit by reducing the output current of the rectifier circuit.

[0015] In this way, the temperature limiting unit is used to reduce the set voltage value in the voltage regulation unit when the temperature of the rectifier circuit reaches the upper limit value, thereby reducing the output voltage of the rectifier circuit, and thus limiting the loss and temperature of the rectifier circuit by reducing the output current of the rectifier circuit.

[0016] Preferably, when the magneto rotates and the AC line voltage of any phase in the rectifier circuit is not less than 0.5V, the power-on unit is activated to connect the positive terminal of the battery to the rectifier control module.

[0017] When the magneto stops rotating and the AC line voltage of all phases in the rectifier circuit is less than 0.5V, the power-on unit stops operating to disconnect the positive terminal of the battery from the rectifier control module, thereby reducing the standby current of the rectifier circuit when the magneto stops rotating.

[0018] In this way, the power-on unit can ensure the normal operation of the rectifier, and at the same time reduce the standby current of the rectifier when the motorcycle engine stops running.

[0019] Preferably, the upper bridge arm of the rectifier circuit includes thyristors T1, T3, and T5, and the lower bridge arm of the rectifier circuit includes thyristors T4, T6, and T2. The thyristor driving unit includes a first driving circuit, a second driving circuit, a third driving circuit, a fourth driving circuit, a fifth driving circuit, and a sixth driving circuit. The first driving circuit is connected to the control electrode of thyristor T1, the second driving circuit is connected to the control electrode of thyristor T2, the third driving circuit is connected to the control electrode of thyristor T3, the fourth driving circuit is connected to the control electrode of thyristor T4, the fifth driving circuit is connected to the control electrode of thyristor T5, and the sixth control circuit is connected to the control electrode of thyristor T6.

[0020] Thus, the rectifier circuit is a three-phase bridge rectifier circuit. Both the upper and lower bridge arms of the rectifier circuit are composed of thyristors to rectify the AC power generated by the motorcycle magneto into DC power. When the AC voltage of a phase exceeds the battery voltage (V>Vbat), if the thyristor trigger signal of the upper bridge arm of that phase is present, the thyristor of that phase's upper bridge arm will conduct. When the AC voltage of a phase is below 0V, if the thyristor trigger signal of the lower bridge arm of that phase is present, the thyristor of that phase's lower bridge arm will conduct. In this way, the AC energy generated by the magneto is output to the downstream load through the three-phase bridge rectifier. When the AC voltage of a phase is below 0V, the thyristor of the upper bridge arm is cut off; when the AC voltage of a phase is above 0V, the thyristor of the lower bridge arm of that phase is cut off. The trigger signals of the thyristors of the three phase upper and lower bridge arms can be applied or removed simultaneously, or they can be coordinated with the corresponding phase angle to trigger the thyristors.

[0021] The thyristor driving unit includes a first driving circuit connected to the control electrode of thyristor T1, a second driving circuit connected to the control electrode of thyristor T2, a third driving circuit connected to the control electrode of thyristor T3, a fourth driving circuit connected to the control electrode of thyristor T4, a fifth driving circuit connected to the control electrode of thyristor T5, and a sixth driving circuit connected to the control electrode of thyristor T6. When the thyristor driving unit sends a trigger signal to thyristor Tn (n=1, 2, 3, 4, 5, 6), the nth driving circuit applies the driving voltage output from the boost unit to the gate (G) of thyristor Tn. If thyristor Tn is forward biased at this time, it is turned on. When the thyristor driving unit sends a trigger signal to remove thyristor Tn (n=1, 2, 3, 4, 5, 6), the nth driving circuit removes the driving power applied to the gate (G) of thyristor Tn. After the trigger signal is removed, if thyristor Tn is reverse biased, it is turned off.

[0022] Preferably, the power-on unit includes diodes D1, D2, and D3, resistors R1, R2, and R3, a MOSFET Q1, and a transistor Q2. The anode of diode D1 is connected to the U-phase output terminal of the magneto, and the cathode of diode D1 is connected to the base of transistor Q2 through resistor R3. The anode of diode D2 is connected to the V-phase output terminal of the magneto, and the cathode of diode D2 is connected to the base of transistor Q2 through resistor R3. The anode of diode D3 is connected to the W-phase output terminal of the magneto. The cathode of transistor D3 is connected to the base of transistor Q2 through resistor R3. The emitter of transistor Q2 is grounded. The collector of transistor Q2 is connected to one end of resistor R2. The other end of resistor R2 is connected to one end of resistor R1 and the gate of MOSFET Q1. The other end of resistor R1 is connected to the positive terminal of the battery and the drain of MOSFET Q1. The source of MOSFET Q1 serves as the output terminal of the power-on unit and is connected to the boost unit, the voltage regulation unit, and the temperature limiting unit.

[0023] Thus, when the magneto rotates and the AC line voltage of any phase is not less than 0.5V, the AC phase voltage is rectified by diodes D1, D2, and D3, which controls transistor Q2 and MOSFET Q1 to conduct, activating the power-on unit and connecting the positive terminal of the battery to the rectifier control module. The power-on unit uses a MOSFET as its actuator switch due to its low impedance and low conduction loss. When the magneto (ACG) stops rotating and the AC line voltage of all phases is less than 0.5V, transistors Q2 and Q1 are both cut off, the power-on unit stops operating, and the connection between the rectifier control module and the positive terminal of the battery is disconnected. The power-on unit ensures that the standby current of the rectifier is reduced when the motorcycle engine is not running.

[0024] Preferably, the boost unit includes an inductor L, a diode D4, a capacitor C1, a transistor Q3, and a control circuit. One end of the inductor L is connected to the output terminal of the power-on unit, and the other end of the inductor L is connected to both the anode of the diode D4 and the collector of the transistor Q3. The emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to the control circuit. The cathode of the diode D4 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded. The cathode of the diode D4 serves as the output terminal of the boost unit and is connected to the thyristor drive unit.

[0025] In this way, the inductor L, diode D4, capacitor C1, and transistor Q3 constitute a BOOST boost circuit. When transistor Q3 is turned on, inductor L stores energy; when transistor Q3 is turned off, inductor L discharges through diode D4 to charge capacitor C1. At the same time, capacitor C1 also has a filtering function.

[0026] Preferably, the control circuit includes a capacitor C2, transistors Q4 and Q5, diodes D5 and D6, resistors R4 and R5, and a Zener diode Z1. One end of capacitor C2 is connected to the anode of diode D4, and the other end of capacitor C2 is grounded through resistor R5. The emitter of transistor Q4 is connected to the output terminal of the power-on unit. The collector of transistor Q4 is connected to the base of transistor Q3. The base of transistor Q4 is connected to the anode of diode D5. The cathode of diode D5 is grounded through resistor R5. The emitter of transistor Q5 is connected to the cathode of diode D4. The collector of transistor Q5 is connected to the anode of diode D6. The cathode of diode D6 is grounded through resistor R5. The base of transistor Q5 is connected to both one end of resistor R4 and the cathode of Zener diode Z1. The anode of Zener diode Z1 is grounded. The other end of resistor R4 is connected to the cathode of diode D4.

[0027] Thus, capacitor C2, diode D5, and transistor Q4 form the oscillation pulse generation circuit for the BOOST circuit. When the end of inductor L connected to capacitor C2 is at a high level, capacitor C2 is charged. Initially, when capacitor C2 is charging, the base of transistor Q4 is at a high level, and transistor Q4 is cut off. As capacitor C2 charges, the base voltage of transistor Q4 decreases, causing transistor Q4 to conduct, which in turn turns on transistor Q3, and the BOOST boost circuit starts working and boosts the voltage. When capacitor C2 discharges, causing transistor Q4 to turn off, transistor Q3 also turns off. Resistor R4, Zener diode Z1, transistor Q5, and diode D6 form the boost limiting circuit. When the output voltage VDR reaches the set voltage, transistor Q5 conducts, causing transistor Q4 to turn off, stopping the BOOST boost.

[0028] Preferably, the temperature limiting unit includes resistors R6 and R7, transistors Q6 and Q7, a PTC resistor Rp, and a logic circuit. One end of resistor R6 is connected to the output terminal of the power-on unit, and the other end of resistor R6 is connected to one end of the PTC resistor Rp. The other end of the PTC resistor Rp is simultaneously connected to one end of resistor R7 and the base of transistor Q6. The other end of resistor R7 is grounded. The emitter of transistor Q6 is grounded. The collector of transistor Q6 is connected to the logic circuit. The base of transistor Q7 is connected to the logic circuit. The emitter of transistor Q7 is grounded. The collector of transistor Q7 serves as the output terminal of the temperature limiting unit and is connected to the voltage regulation unit.

[0029] Thus, when the rectifier temperature reaches the set upper temperature limit Tset (e.g., 120℃~150℃), the PTC resistor Rp is in a high resistance state. At this time, transistor Q6 is cut off and transistor Q7 is turned on. After transistor Q7 is turned on, it will adjust the voltage division of resistor R10 in the voltage regulation unit, so that the OC gate formed by transistor Q7 is used to reduce the set voltage value of the voltage regulation unit (e.g., reduce the output by 0.5V~1.5V). At this time, the output voltage of the rectifier decreases. As the output voltage of the rectifier decreases, the rectifier loss decreases, and the rectifier temperature also decreases. When the rectifier temperature drops below the upper limit Tset, the PTC resistor Rp is in a low resistance state. At this time, transistor Q6 is turned on and transistor Q7 is cut off. The temperature limiting unit returns to its pre-operation state, and the OC gate it controls also returns to its original state. It no longer adjusts the set voltage value of the voltage regulation unit. The set voltage value of the voltage regulation unit is restored, and the rectifier also returns to its original set voltage Vref.

[0030] Preferably, the logic circuit includes a resistor R8 and a Zener diode Z2. One end of the resistor R8 is connected between the collector of the transistor Q6 and the base of the transistor Q7, and the other end of the resistor R8 is connected between the resistor R6 and the PTC resistor Rp. The anode of the Zener diode Z2 is grounded, and the cathode of the Zener diode Z2 is connected between the resistor R6 and the PTC resistor Rp.

[0031] Preferably, the voltage regulation unit includes a resistor R9, a resistor R10, a capacitor C3, a transistor Q8, a Zener diode Z3, an impedance matching circuit, and a conversion circuit. One end of the resistor R10 is grounded, and the other end of the resistor R10 is connected to both the anode of the Zener diode Z3 and the conversion circuit. The conversion circuit is connected to the output terminal of the temperature limiting unit. The cathode of the Zener diode Z3 is connected to one end of the resistor R9, one end of the capacitor C3, and the base of the transistor Q8. The other end of the resistor R9, the other end of the capacitor C3, and the emitter of the transistor Q8 are all connected to the output terminal of the power-on unit. The collector of the transistor Q8 is connected to the impedance matching circuit, which also serves as the output terminal of the voltage regulation unit and is connected to the thyristor drive unit.

[0032] Thus, when the output voltage of the rectifier circuit is less than or equal to the set voltage, transistor Q8 is cut off, causing the impedance matching circuit to disconnect, SDRi to release, and acting on the thyristor drive unit to turn on the thyristor. The three-phase bridge rectifier circuit starts rectification, providing energy to the downstream load and charging the battery. When the output voltage of the rectifier circuit is greater than the set voltage, transistor Q8 is turned on, causing the impedance matching circuit to conduct, SDRi to be at a low level, and acting on the thyristor drive unit to turn off the thyristor. At this time, the three-phase bridge rectifier circuit stops rectification, the downstream load energy is provided by the battery, the battery discharges, and the output voltage of the rectifier decreases.

[0033] At the same time, when the rectifier temperature reaches the set upper temperature limit, causing transistor Q7 to conduct, T lim When shorted to ground, the temperature limiting unit generates a specific equivalent resistance in parallel with resistor R10, increasing the voltage drop across resistor R9. This lowers the control point of transistor Q8, resulting in V. P The output voltage VO of the equivalent rectifier decreases to reach equilibrium, corresponding to a decrease in the rectifier's output voltage. When the rectifier temperature drops below its upper limit, causing transistor Q7 to turn off, T... lim When the circuit is released to ground, the specific equivalent resistance generated by the temperature limiting unit and the parallel relationship with resistor R10 are removed, causing the voltage drop across resistor R9 to decrease. This raises the control point of transistor Q8, resulting in V. P When the equivalent rectifier output voltage VO increases to reach equilibrium, the corresponding rectifier output voltage increases.

[0034] Preferably, the impedance matching circuit includes resistor R11, resistor R12, capacitor C4, and transistor Q9. One end of resistor R11 is connected to the collector of transistor Q8, and the other end of resistor R11 is connected to one end of resistor R12, one end of capacitor C4, and the base of transistor Q9. The other end of resistor R12, the other end of capacitor C4, and the emitter of transistor Q9 are grounded, and the collector of transistor Q9 is connected to the thyristor driving unit.

[0035] Thus, when the output voltage of the rectifier circuit is less than or equal to the set voltage, transistor Q8 is cut off, causing transistor Q9 to turn off, SDRi is released, and it acts on the thyristor drive unit to turn on the thyristor; when the output voltage of the rectifier circuit is greater than the set voltage, transistor Q8 is turned on, causing transistor Q9 to turn on, SDRi is at a low level, and it acts on the thyristor drive unit to turn off the thyristor.

[0036] Compared with the prior art, in this invention, the boost unit is used to boost the control voltage output by the power-on unit to a value greater than the set voltage (e.g., 15V), serving as the drive power for the drive circuits corresponding to the thyristors T1 / T2 / T3 / T4 / T5 / T6; the power-on unit is used to detect the rotation of the magneto and connect the battery power supply as the control power supply; the temperature limiting unit is used to reduce the output voltage setting of the rectifier when the rectifier temperature reaches the limit value, thereby limiting the rectifier temperature by reducing the rectifier output current and limiting the rectifier loss; the upper bridge arm of the three-phase bridge rectifier circuit Both the upper and lower bridge arms are composed of thyristors, which rectify the AC power generated by the motorcycle magneto into DC power. The thyristor drive unit includes drive circuits corresponding to thyristors T1 / T2 / T3 / T4 / T5 / T6. When the voltage regulation unit outputs a thyristor conduction control signal to the thyristor drive unit, it sends out the drive voltage to trigger the corresponding thyristor. The voltage regulation unit compares the output voltage with the set voltage. When the output voltage is lower than the set voltage, the three-phase bridge rectifier circuit starts rectification; when the output voltage is higher than the set voltage, the three-phase bridge rectifier circuit stops rectification. This invention can increase the output current of the rectifier at low speeds of the motorcycle engine, and setting a certain drive power supply facilitates the standardization of the electrical parameters of the power element drive performance, improving the reliability of the thyristor drive circuit. At the same time, this invention is also applicable to the control of single-phase full-wave bridge rectification. Attached Figure Description

[0037] Figure 1 This is a system block diagram of a switching rectifier in the prior art;

[0038] Figure 2 This is a circuit diagram of a switching rectifier rectifier unit in the prior art;

[0039] Figure 3This is a system block diagram of the control system for a motorcycle switching rectifier that improves low-speed current according to the present invention.

[0040] Figure 4 This is a circuit diagram of the internal circuit of the thyristor drive unit in the control system of the motorcycle switching rectifier for increasing low-speed current according to the present invention.

[0041] Figure 5 This is a circuit diagram of the start-up unit in the control system of the motorcycle switching rectifier for improving low-speed current according to the present invention.

[0042] Figure 6 This is a circuit block diagram of the boost unit inside the control system of the motorcycle switching rectifier for boosting low-speed current according to the present invention.

[0043] Figure 7 This is a detailed circuit diagram of the boost unit inside the control system of the motorcycle switching rectifier for boosting low-speed current according to the present invention.

[0044] Figure 8 This is a circuit block diagram of the temperature limiting unit in the control system of the motorcycle switching rectifier for improving low-speed current according to the present invention.

[0045] Figure 9 The circuit diagram shows the internal temperature limiting unit of the control system for a motorcycle switching rectifier that improves low-speed current according to the present invention.

[0046] Figure 10 This is a diagram showing the working relationship of the temperature limiting unit in the control system of the motorcycle switching rectifier for improving low-speed current according to the present invention.

[0047] Figure 11 This is a circuit block diagram of the voltage regulation unit in Embodiment 1 of the control system for a motorcycle switching rectifier that improves low-speed current according to the present invention.

[0048] Figure 12 This is a detailed circuit diagram of the internal circuit of the voltage regulation unit in Embodiment 1 of the control system for a motorcycle switching rectifier that improves low-speed current according to the present invention.

[0049] Figure 13 This is a circuit block diagram of the voltage regulation unit in Embodiment 2 of the control system for a motorcycle switching rectifier that improves low-speed current according to the present invention. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0051] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0052] As attached Figure 3 As shown, a control system for a motorcycle switching rectifier that boosts low-speed current includes a magneto, a rectifier circuit, and a battery. The upper and lower bridge arms of the rectifier circuit are both composed of thyristors. The control system also includes a rectifier control module, which includes a power-on unit, a boost unit, a voltage regulation unit, and a thyristor drive unit.

[0053] The power-on unit is used to disconnect or connect the rectifier control module and the battery according to the working status of the magneto, and the output voltage of the power-on unit is the output voltage of the rectifier circuit.

[0054] The boost unit is used to boost the voltage output by the power-on unit to a set voltage, which is then used as the control voltage for the thyristor drive unit.

[0055] The voltage regulation unit is used to compare the relationship between the output voltage of the rectifier circuit and the set voltage. When the output voltage of the rectifier circuit is less than or equal to the set voltage, it outputs a thyristor turn-on signal to the thyristor drive unit, and when the output voltage of the rectifier circuit is greater than the set voltage, it outputs a thyristor turn-off signal to the thyristor drive unit.

[0056] The thyristor drive unit includes multiple thyristor drive circuits, each corresponding to a thyristor in the rectifier circuit, so that the thyristor drive circuit can send control signals to the corresponding thyristor.

[0057] This invention provides an independent drive power supply for the thyristor drive unit. A boost unit amplifies the voltage output from the power-on unit to a set voltage, and then outputs this amplified voltage to the thyristor drive unit as its drive power supply. The drive power supply for the thyristor drive unit is connected to a battery, and the boost unit reliably provides sufficient drive voltage to the thyristors in the rectifier circuit within a temperature range of -30°C (this drive voltage can be adjusted as needed, typically between 15 and 25V). Thus, the drive voltage output to the thyristor drive unit is constant and independent of the magneto's AC voltage. This ensures sufficient drive voltage to turn on the thyristors and output a large current even when the magneto is rotating at low speeds. When this control system is applied to a switching rectifier, the switching rectifier can also output a large current at low magneto speeds, thereby expanding the application range of the switching rectifier and reducing the current difference between high and low magneto rotation. This significantly reduces the parameter requirements for the components in the thyristor drive branch, thereby improving the economy and reliability of its use. Taking the commonly used TH3015-6G as an example, adjusting the drive current-limiting resistor to set the temperature trigger current to 30mA is sufficient, with a total trigger current of 150mA for the six thyristors. If the existing design is followed to meet the total trigger current of 150mA at low temperature and low speed, the total trigger current will reach 11A at high speed, with a voltage of around 400V. The power density and reliability of the two drive units differ significantly.

[0058] In this embodiment, the control system further includes a temperature limiting unit, which is used to detect the temperature of the rectifier circuit and reduce the set voltage of the voltage regulating unit when the temperature of the rectifier circuit exceeds the set temperature value, so as to limit the temperature of the rectifier circuit by reducing the output current of the rectifier circuit.

[0059] In this way, the temperature limiting unit is used to reduce the set voltage value in the voltage regulation unit when the temperature of the rectifier circuit reaches the upper limit value, thereby reducing the output voltage of the rectifier circuit, and thus limiting the loss of rectifier current and the temperature of rectifier current by reducing the output current of the rectifier circuit.

[0060] As attached Figure 4As shown, in this embodiment, the upper bridge arm of the rectifier circuit includes thyristors T1, T3, and T5, and the lower bridge arm of the rectifier circuit includes thyristors T4, T6, and T2. The thyristor driving unit includes a first driving circuit, a second driving circuit, a third driving circuit, a fourth driving circuit, a fifth driving circuit, and a sixth driving circuit. The first driving circuit is connected to the control electrode of thyristor T1, the second driving circuit is connected to the control electrode of thyristor T2, the third driving circuit is connected to the control electrode of thyristor T3, the fourth driving circuit is connected to the control electrode of thyristor T4, the fifth control circuit is connected to the control electrode of thyristor T5, and the sixth control circuit is connected to the control electrode of thyristor T6.

[0061] Thus, the rectifier circuit is a three-phase bridge rectifier circuit. Both the upper and lower bridge arms of the rectifier circuit are composed of thyristors to rectify the AC power generated by the motorcycle magneto into DC power. When the AC voltage of a phase exceeds the battery voltage (V>Vbat), if the thyristor trigger signal of the upper bridge arm of that phase is present, the thyristor of that phase's upper bridge arm will conduct. When the AC voltage of a phase is below 0V, if the thyristor trigger signal of the lower bridge arm of that phase is present, the thyristor of that phase's lower bridge arm will conduct. In this way, the AC energy generated by the magneto is output to the downstream load through the three-phase bridge rectifier. When the AC voltage of a phase is below 0V, the thyristor of the upper bridge arm is cut off; when the AC voltage of a phase is above 0V, the thyristor of the lower bridge arm of that phase is cut off. The trigger signals of the thyristors of the three phase upper and lower bridge arms can be applied or removed simultaneously, or they can be coordinated with the corresponding phase angle to trigger the thyristors.

[0062] The thyristor driving unit includes a first driving circuit connected to the control electrode of thyristor T1, a second driving circuit connected to the control electrode of thyristor T2, a third driving circuit connected to the control electrode of thyristor T3, a fourth driving circuit connected to the control electrode of thyristor T4, a fifth driving circuit connected to the control electrode of thyristor T5, and a sixth driving circuit connected to the control electrode of thyristor T6. When the thyristor driving unit sends a trigger signal to thyristor Tn (n=1, 2, 3, 4, 5, 6), the nth driving circuit applies the driving voltage output from the boost unit to the gate (G) of thyristor Tn. If thyristor Tn is forward biased at this time, it is turned on. When the thyristor driving unit sends a trigger signal to remove thyristor Tn (n=1, 2, 3, 4, 5, 6), the nth driving circuit removes the driving power applied to the gate (G) of thyristor Tn. After the trigger signal is removed, if thyristor Tn is reverse biased, it is turned off.

[0063] For details, see attached. Figure 4As shown, the fifth driving circuit is used as an example for explanation. The circuits of the other driving circuits are similar. The fifth driving circuit includes a resistor R13, a diode D7, and a transistor Q11. One end of the resistor R13 is connected to the control electrode of the thyristor T5, and the other end of the resistor R13 is connected to the cathode of the diode D7. The anode of the diode D7 is connected to the collector of the transistor Q11, and the emitter of the transistor Q11 is connected to the boost unit.

[0064] In this embodiment, when the magneto rotates and the AC line voltage of any phase in the rectifier circuit is not less than 0.5V, the power-on unit is activated to connect the positive terminal of the battery to the rectifier control module.

[0065] When the magneto stops rotating and the AC line voltage of all phases in the rectifier circuit is less than 0.5V, the start-up unit stops operating to disconnect the positive terminal of the battery from the rectifier control module, thereby reducing the standby current of the rectifier circuit when the magneto stops rotating. 0.5V is a typical shutdown value; due to variations in device parameters, the actual shutdown value may be 0.6V or higher, which does not violate the claims of this patent.

[0066] In this way, the power-on unit can ensure the normal operation of the rectifier, and at the same time reduce the standby current of the rectifier when the motorcycle engine stops running.

[0067] As attached Figure 5 As shown, in this embodiment, the power-on unit includes diodes D1, D2, and D3, resistors R1, R2, and R3, MOSFET Q1, and transistor Q2. The anode of diode D1 is connected to the U-phase output terminal of the magneto, and the cathode of diode D1 is connected to the base of transistor Q2 through resistor R3. The anode of diode D2 is connected to the V-phase output terminal of the magneto, and the cathode of diode D2 is connected to the base of transistor Q2 through resistor R3. The anode of diode D3 is connected to the W-phase output terminal of the magneto. The output terminals are connected as follows: the cathode of diode D3 is connected to the base of transistor Q2 through resistor R3; the emitter of transistor Q2 is grounded; the collector of transistor Q2 is connected to one end of resistor R2; the other end of resistor R2 is connected to one end of resistor R1 and the gate of MOSFET Q1; the other end of resistor R1 is connected to the positive terminal of the battery and the drain of MOSFET Q1; and the source of MOSFET Q1 serves as the output terminal of the power-on unit and is connected to the boost unit, voltage regulation unit, and temperature limiting unit.

[0068] Thus, when the magneto rotates and the AC line voltage of any phase is not less than 0.5V, the AC phase voltage is rectified by diodes D1, D2, and D3, which controls transistor Q2 and MOSFET Q1 to conduct, activating the power-on unit and connecting the positive terminal of the battery to the rectifier control module. The power-on unit uses a MOSFET as its actuator switch due to its low impedance and low conduction loss. When the magneto (ACG) stops rotating and the AC line voltage of all phases is less than 0.5V, transistors Q2 and Q1 are both cut off, the power-on unit stops operating, and the connection between the rectifier control module and the positive terminal of the battery is disconnected. The power-on unit ensures that the standby current of the rectifier is reduced when the motorcycle engine is not running.

[0069] As attached Figure 6 and attached Figure 7 As shown, in this embodiment, the boost unit includes an inductor L, a diode D4, a capacitor C1, a transistor Q3, and a control circuit. One end of the inductor L is connected to the output terminal of the power-on unit, and the other end of the inductor L is connected to both the anode of the diode D4 and the collector of the transistor Q3. The emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to the control circuit. The cathode of the diode D4 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded. The cathode of the diode D4 serves as the output terminal of the boost unit and is connected to the thyristor drive unit. The control circuit includes capacitor C2, transistors Q4 and Q5, diodes D5 and D6, resistors R4 and R5, and Zener diode Z1. One end of capacitor C2 is connected to the anode of diode D4, and the other end of capacitor C2 is grounded through resistor R5. The emitter of transistor Q4 is connected to the output terminal of the power-on unit. The collector of transistor Q4 is connected to the base of transistor Q3. The base of transistor Q4 is connected to the anode of diode D5. The cathode of diode D5 is grounded through resistor R5. The emitter of transistor Q5 is connected to the cathode of diode D4. The collector of transistor Q5 is connected to the anode of diode D6. The cathode of diode D6 is grounded through resistor R5. The base of transistor Q5 is connected to both one end of resistor R4 and the cathode of Zener diode Z1. The anode of Zener diode Z1 is grounded. The other end of resistor R4 is connected to the cathode of diode D4.

[0070] In this way, the inductor L, diode D4, capacitor C1, and transistor Q3 constitute a BOOST boost circuit. When transistor Q3 is turned on, inductor L stores energy; when transistor Q3 is turned off, inductor L discharges through diode D4 to charge capacitor C1. At the same time, capacitor C1 also has a filtering function. Capacitor C2, diode D5, and transistor Q4 form the oscillation pulse generation circuit for the BOOST circuit. When the end of inductor L connected to capacitor C2 is at a high level, capacitor C2 is charged. Initially, the base of transistor Q4 is at a high level, and transistor Q4 is cut off. As capacitor C2 charges, the base voltage of transistor Q4 decreases, causing transistor Q4 to conduct, which in turn turns on transistor Q3, and the BOOST boost circuit starts working and boosts the voltage. When capacitor C2 discharges, causing transistor Q4 to turn off, transistor Q3 also turns off. Resistor R4, Zener diode Z1, transistor Q5, and diode D6 form the boost limiting circuit. When the output voltage VDR reaches the set voltage, transistor Q5 conducts, causing transistor Q4 to turn off, stopping the BOOST boost.

[0071] As attached Figure 8 and attached Figure 9 As shown, in this embodiment, the temperature limiting unit includes resistors R6 and R7, transistors Q6 and Q7, a PTC resistor Rp, and logic circuitry. One end of resistor R6 is connected to the output terminal of the power-on unit, and the other end of resistor R6 is connected to one end of the PTC resistor Rp. The other end of the PTC resistor Rp is simultaneously connected to one end of resistor R7 and the base of transistor Q6. The other end of resistor R7 is grounded. The emitter of transistor Q6 is grounded, and the collector of transistor Q6 is connected to the logic circuitry. The base of transistor Q7 is connected to the logic circuitry, and the emitter of transistor Q7 is grounded. The collector of transistor Q7 serves as the output terminal of the temperature limiting unit and is connected to the voltage regulation unit. The logic circuit includes a resistor R8 and a Zener diode Z2. One end of the resistor R8 is connected between the collector of transistor Q6 and the base of transistor Q7, and the other end of the resistor R8 is connected between the resistor R6 and the PTC resistor Rp. The anode of the Zener diode Z2 is grounded, and the cathode of the Zener diode Z2 is connected between the resistor R6 and the PTC resistor Rp.

[0072] Thus, when the rectifier temperature reaches the set upper temperature limit Tset (e.g., 120℃~150℃), the PTC resistor Rp is in a high-resistance state. At this time, transistor Q6 is cut off and transistor Q7 is turned on. After transistor Q7 turns on, it adjusts the voltage division of resistor R10 in the voltage regulation unit, thereby making the OC gate formed by transistor Q7 used to reduce the set voltage value of the voltage regulation unit (e.g., reduce the output by 0.5V~1.5V). At this time, the output voltage of the rectifier decreases. As the output voltage of the rectifier decreases, the rectifier loss decreases, and the rectifier temperature also decreases. When the rectifier temperature drops below the upper limit Tset, the PTC resistor Rp is in a low-resistance state. At this time, transistor Q6 turns on and transistor Q7 is cut off. The temperature limiting unit returns to its pre-operation state, and the OC gate it controls also returns to its original state. It no longer adjusts the set voltage value of the voltage regulation unit, and the set voltage value of the voltage regulation unit returns to its original state. The rectifier also returns to its original set voltage Vref. The specific working relationship of the temperature control unit is shown in the attached figure. Figure 10 As shown.

[0073] Example 1:

[0074] As attached Figure 11 and attached Figure 12 As shown, in this embodiment, the voltage regulation unit includes resistor R9, resistor R10, capacitor C3, transistor Q8, Zener diode Z3, impedance matching circuit, and conversion circuit. One end of resistor R10 is grounded, and the other end of resistor R10 is connected to both the anode of Zener diode Z3 and the conversion circuit. The conversion circuit is connected to the output of the temperature limiting unit. The cathode of Zener diode Z3 is connected to one end of resistor R9, one end of capacitor C3, and the base of transistor Q8. The other end of resistor R9, the other end of capacitor C3, and the emitter of transistor Q8 are all connected to the output of the power-on unit. The collector of transistor Q8 is connected to the impedance matching circuit, which also serves as the output of the voltage regulation unit and is connected to the thyristor drive unit. The impedance matching circuit includes resistors R11 and R12, capacitor C4, and transistor Q9. One end of resistor R11 is connected to the collector of transistor Q8, and the other end of resistor R11 is connected to one end of resistor R12, one end of capacitor C4, and the base of transistor Q9. The other end of resistor R12, the other end of capacitor C4, and the emitter of transistor Q9 are grounded. The collector of transistor Q9 is connected to the thyristor drive unit.

[0075] Thus, when the output voltage of the rectifier circuit is less than or equal to the set voltage, transistor Q8 is cut off, causing transistor Q9 to turn off, SDRi is released, and it acts on the thyristor drive unit to turn on the thyristor. The three-phase bridge rectifier circuit starts rectification to provide energy to the downstream load and charge the battery. When the output voltage of the rectifier circuit is greater than the set voltage, transistor Q8 turns on, causing transistor Q9 to turn on. SDRi is at a low level, acting on the thyristor drive unit to turn off the thyristor. At this time, the three-phase bridge rectifier circuit stops rectification, the downstream load energy is provided by the battery, the battery discharges, and the output voltage of the rectifier decreases.

[0076] At the same time, when the rectifier temperature reaches the set upper temperature limit, causing transistor Q7 to conduct, T lim When shorted to ground, the temperature limiting unit generates a specific equivalent resistance in parallel with resistor R10, increasing the voltage drop across resistor R9. This lowers the control point of transistor Q8, resulting in V. P The output voltage VO of the equivalent rectifier decreases to reach equilibrium, corresponding to a decrease in the rectifier's output voltage. When the rectifier temperature drops below its upper limit, causing transistor Q7 to turn off, T... lim When the circuit is released to ground, the specific equivalent resistance generated by the temperature limiting unit and the parallel relationship with resistor R10 are removed, causing the voltage drop across resistor R9 to decrease. This raises the control point of transistor Q8, resulting in V. P When the equivalent rectifier output voltage VO increases to reach equilibrium, the corresponding rectifier output voltage increases.

[0077] Example 2:

[0078] In this embodiment, the voltage regulation unit can also be an operational amplifier circuit. The voltage regulation unit using an operational amplifier circuit includes a commutation point identification circuit, a U-phase sawtooth wave generation circuit, a V-phase sawtooth wave generation circuit, a W-phase sawtooth wave generation circuit, a differential amplifier circuit, and an impedance transformation network. The commutation point identification circuit uses the circuit diagram in Figure 16 of the invention patent with publication number CN105634097B. The U-phase sawtooth wave generation circuit, the V-phase sawtooth wave generation circuit, and the W-phase sawtooth wave generation circuit all use the circuit diagram in Figure 16 of the invention patent with publication number CN105634097B. Figure 11 The circuit diagram is shown, and the differential amplifier circuit adopts the invention patent with publication number CN105634097B. Figure 8 The circuit diagram shows that the differential amplifier circuit amplifies the setting / feedback difference to generate a control voltage, which is then fed into the operational amplifiers of each phase sawtooth wave generation circuit. After comparison by the operational amplifiers of each phase sawtooth wave generation circuit, a control signal S is generated. DRi（i=1） / S DRi（i=2） / S DRi（i=3）The signal is transmitted to the thyristor drive unit, generating thyristor drive signals for the U / V / W phases. When the rectifier's output voltage is lower than the set voltage, the differential amplifier circuit reduces the control voltage, and the operational amplifiers of each phase sawtooth wave generation circuit output control signals S. DRi（i=1） / S DRi（i=2） / S DRi（i=3） When the output voltage is released to a high level, the thyristor drive unit drives the signal distribution circuit to operate the corresponding phase's thyristor to conduct; when the output voltage is greater than the set voltage, the operational amplifier outputs the control signal S from each phase's sawtooth wave generation circuit. DRi（i=1） / S DRi（i=2） / S DRi（i=3） When the signal level is low, the thyristor drive unit drive signal distribution circuit does not send a thyristor trigger signal.

[0079] Compared with the prior art, in this invention, the boost unit is used to boost the control voltage output by the power-on unit to a value greater than the set voltage (e.g., 15V), serving as the drive power for the drive circuits corresponding to the thyristors T1 / T2 / T3 / T4 / T5 / T6; the power-on unit is used to detect the rotation of the magneto and connect the battery power supply as the control power supply; the temperature limiting unit is used to reduce the output voltage setting of the rectifier when the rectifier temperature reaches the limit value, thereby limiting the rectifier temperature by reducing the rectifier output current and limiting the rectifier loss; the upper bridge arm of the three-phase bridge rectifier circuit Both the upper and lower bridge arms are composed of thyristors, which rectify the AC power generated by the motorcycle magneto into DC power. The thyristor drive unit includes drive circuits corresponding to thyristors T1 / T2 / T3 / T4 / T5 / T6. When the voltage regulation unit outputs a thyristor conduction control signal to the thyristor drive unit, it sends out the drive voltage to trigger the corresponding thyristor. The voltage regulation unit compares the output voltage with the set voltage. When the output voltage is lower than the set voltage, the three-phase bridge rectifier circuit starts rectification; when the output voltage is higher than the set voltage, the three-phase bridge rectifier circuit stops rectification. This invention can increase the output current of the rectifier at low speeds of the motorcycle engine, and setting a certain drive power supply facilitates the standardization of the electrical parameters of the power element drive performance, thus improving the reliability of the thyristor drive circuit.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A control system for a switching rectifier for a motorcycle that boosts low-speed current, comprising a magneto, a rectifier circuit, and a storage battery, the upper and lower bridge arms of the rectifier circuit each being composed of a thyristor, characterized in that, The control system further includes a rectification control module, which includes a power-on unit, a boost unit, a voltage regulation unit, and a thyristor drive unit. The power-on unit is used to disconnect or connect the rectifier control module and the battery according to the working state of the magneto, and the output voltage of the power-on unit is the output voltage of the rectifier circuit; The boost unit is used to boost the voltage output by the power-on unit to a set voltage, which is then used as the control voltage for the thyristor drive unit. The boost unit includes an inductor L, a diode D4, a capacitor C1, a transistor Q3, and a control circuit. One end of the inductor L is connected to the output terminal of the power-on unit, and the other end of the inductor L is connected to both the anode of the diode D4 and the collector of the transistor Q3. The emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to the control circuit. The cathode of the diode D4 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded. The cathode of the diode D4 serves as the output terminal of the boost unit and is connected to the thyristor drive unit. The control circuit includes a capacitor C2, transistors Q4 and Q5, diodes D5 and D6, resistors R4 and R5, and a voltage regulator. Diode Z1; one end of capacitor C2 is connected to the anode of diode D4, and the other end of capacitor C2 is grounded through resistor R5; the emitter of transistor Q4 is connected to the output terminal of the power-on unit; the collector of transistor Q4 is connected to the base of transistor Q3; the base of transistor Q4 is connected to the anode of diode D5; the cathode of diode D5 is grounded through resistor R5; the emitter of transistor Q5 is connected to the cathode of diode D4; the collector of transistor Q5 is connected to the anode of diode D6; the cathode of diode D6 is grounded through resistor R5; the base of transistor Q5 is connected to both one end of resistor R4 and the cathode of Zener diode Z1; the anode of Zener diode Z1 is grounded; and the other end of resistor R4 is connected to the cathode of diode D4. The voltage regulation unit is used to compare the relationship between the output voltage of the rectifier circuit and the set voltage. When the output voltage of the rectifier circuit is less than or equal to the set voltage, it outputs a thyristor turn-on signal to the thyristor drive unit, and when the output voltage of the rectifier circuit is greater than the set voltage, it outputs a thyristor turn-off signal to the thyristor drive unit. The thyristor driving unit includes multiple thyristor driving circuits, and each of the multiple thyristor driving circuits corresponds one-to-one with a multiple thyristor in the rectifier circuit, so that the thyristor driving circuit can send control signals to the corresponding thyristor.

2. The control system for a motorcycle switching rectifier that boosts low-speed current according to claim 1, characterized in that, The control system further includes a temperature limiting unit, which is used to detect the temperature of the rectifier circuit and reduce the set voltage of the voltage regulating unit when the temperature of the rectifier circuit exceeds the set temperature value, so as to limit the temperature of the rectifier circuit by reducing the output current of the rectifier circuit.

3. The control system for a motorcycle switching rectifier that boosts low-speed current according to claim 2, characterized in that, When the magneto rotates and the AC line voltage of any phase in the rectifier circuit is not less than 0.5V, the power-on unit is activated to connect the positive terminal of the battery to the rectifier control module. When the magneto stops rotating and the AC line voltage of all phases in the rectifier circuit is less than 0.5V, the power-on unit stops operating to disconnect the positive terminal of the battery from the rectifier control module, thereby reducing the standby current of the rectifier circuit when the magneto stops rotating.

4. The control system for a motorcycle switching rectifier that boosts low-speed current according to claim 3, characterized in that, The power-on unit includes diodes D1, D2, and D3, resistors R1, R2, and R3, a MOSFET Q1, and a transistor Q2. The anode of diode D1 is connected to the U-phase output terminal of the magneto, and the cathode of diode D1 is connected to the base of transistor Q2 via resistor R3. The anode of diode D2 is connected to the V-phase output terminal of the magneto, and the cathode of diode D2 is connected to the base of transistor Q2 via resistor R3. The anode of diode D3 is connected to the W-phase output terminal of the magneto. The cathode of D3 is connected to the base of transistor Q2 through resistor R3. The emitter of transistor Q2 is grounded. The collector of transistor Q2 is connected to one end of resistor R2. The other end of resistor R2 is connected to one end of resistor R1 and the gate of MOSFET Q1. The other end of resistor R1 is connected to the positive terminal of the battery and the drain of MOSFET Q1. The source of MOSFET Q1 serves as the output terminal of the power-on unit and is connected to the boost unit, the voltage regulation unit, and the temperature limiting unit.

5. The control system for a motorcycle switching rectifier that boosts low-speed current according to claim 4, characterized in that, The temperature limiting unit includes resistors R6 and R7, transistors Q6 and Q7, a PTC resistor Rp, and logic circuitry. One end of resistor R6 is connected to the output of the power-on unit, and the other end of resistor R6 is connected to one end of the PTC resistor Rp. The other end of the PTC resistor Rp is simultaneously connected to one end of resistor R7 and the base of transistor Q6. The other end of resistor R7 is grounded. The emitter of transistor Q6 is grounded, and the collector of transistor Q6 is connected to the logic circuitry. The base of transistor Q7 is connected to the logic circuitry, and the emitter of transistor Q7 is grounded. The collector of transistor Q7 serves as the output of the temperature limiting unit and is connected to the voltage regulation unit.

6. The control system for a motorcycle switching rectifier that boosts low-speed current according to claim 5, characterized in that, The logic circuit includes a resistor R8 and a Zener diode Z2. One end of the resistor R8 is connected between the collector of the transistor Q6 and the base of the transistor Q7. The other end of the resistor R8 is connected between the resistor R6 and the PTC resistor Rp. The anode of the Zener diode Z2 is grounded, and the cathode of the Zener diode Z2 is connected between the resistor R6 and the PTC resistor Rp.

7. The control system for a motorcycle switching rectifier for boosting low-speed current according to claim 6, characterized in that, The voltage regulation unit includes resistor R9, resistor R10, capacitor C3, transistor Q8, Zener diode Z3, impedance matching circuit, and conversion circuit. One end of resistor R10 is grounded, and the other end of resistor R10 is connected to both the anode of Zener diode Z3 and the conversion circuit. The conversion circuit is connected to the output of the temperature limiting unit. The cathode of Zener diode Z3 is connected to one end of resistor R9, one end of capacitor C3, and the base of transistor Q8. The other end of resistor R9, the other end of capacitor C3, and the emitter of transistor Q8 are all connected to the output of the power-on unit. The collector of transistor Q8 is connected to the impedance matching circuit, which also serves as the output of the voltage regulation unit and is connected to the thyristor drive unit.

8. The control system for a motorcycle switching rectifier for boosting low-speed current according to claim 7, characterized in that, The impedance matching circuit includes resistors R11 and R12, capacitor C4, and transistor Q9. One end of resistor R11 is connected to the collector of transistor Q8, and the other end of resistor R11 is connected to one end of resistor R12, one end of capacitor C4, and the base of transistor Q9. The other end of resistor R12, the other end of capacitor C4, and the emitter of transistor Q9 are grounded. The collector of transistor Q9 is connected to the thyristor driving unit.

Images