TW201519569A - Synchronization of pressure reducing and pressure stabilizing device - Google Patents

Abstract

The present invention relates to a synchronization of pressure reducing and pressure stabilizing device, including a three-phase electric generator, a plurality of power transistors without body diode, a LC filter, a battery, a zener diode, and a control unit. The three-phase electric generator is provided with three winding rotors and three signal terminals, which electrically connected with the plurality of power transistors respectively. The control unit is electrically connected with the three-phase electric generator and the plurality of power transistors, for receiving position information of the three-phase electric generator in order to provide a voltage signal. Then according to the voltage signal, which controls whether the plurality of power transistors of three signal terminals are switching on or not, and through the wave filtering and pulse preventing function, thereby decreasing the counter electromotive force when the three-phase electric generator is in refill mode, so that the present invention can avoid large current flow in accordance with the pressure stabilizing system for vehicles.

Description

Synchronous rectification step-down and voltage regulator

The invention relates to a synchronous rectification step-down and voltage regulation device, in particular to a synchronous rectification step-down and voltage regulation device suitable for a steam locomotive power generation system.

The integrated starter generator (ISG: Integrated Starter Generator) integrates the starter motor and the generator on the same motor, and realizes the functions of the motor and the generator, so that the motor has high power density, high efficiency operation, and easy control of the speed. Features, however, in oil-electric hybrid systems, fast two-way energy conversion circuits are needed to complete engine quick start and kinetic energy recovery to increase energy efficiency.

Therefore, as shown in FIG. 1, it is a typical system architecture, which is a schematic diagram of a conventional motor drive and kinetic energy recovery device. The motor drive and kinetic energy recovery device includes a three-phase generator 91, a plurality of power transistors 92, a battery 94, and a control unit 90.

The three-phase generator 91 has three rotor windings and three signal ends, and includes a first rotor winding 910, a second rotor winding 920 and a third The rotor winding 930 has a corresponding first signal end 911, a second signal end 912 and a third signal end 913.

The signal terminals 911, 912, and 913 are respectively connected to the plurality of power transistors 92. Each of the power transistors 92 includes a body diode 931, 932, 933, 934, 935, 936 connecting the source and the drain thereof to provide a rectifying effect. The first signal terminal 911 is connected to the source of the first power transistor 921 and the drain of the fourth power transistor 924; the second signal terminal 912 is connected to the source of the second power transistor 922. The drain of the pole and the fifth power transistor 925; the third signal terminal 913 is connected to the source of the third power transistor 923 and the drain of the sixth power transistor 926 to control the current direction of the battery charging or discharging.

Then, the battery 94 is electrically connected to the plurality of power transistors 92, and is electrically connected to the three-phase generator 91 and the plurality of power transistors 92 through the control unit 90 for receiving the rotor position information of the three-phase generator 91. Provide a voltage signal.

As mentioned above, this device is in principle driven by the battery 94 in the activated state, so the back-EM voltage of the three-phase generator 91 is less than the voltage of the battery 94 under normal conditions. In addition, in the kinetic energy recovery operation, the battery is charged by ingeniously boosting the back electromotive voltage, and applications such as electronically assisted braking can be performed. However, under the conventional circuit architecture, two uncontrollable phenomena may occur. One is when traveling steeply downhill, the back electromotive voltage is greater than the voltage of the battery 94, so that a huge recharge current occurs, and the second is the principle under this circuit architecture. The boosting potential is boosted. In addition to the need to use a boost converter and increase its withstand voltage, the power transistor and phase in the boost circuit The impedance is still lost, resulting in a drop in efficiency.

Because of this, in the spirit of active invention, this is a synchronous rectification step-down and voltage regulator that can solve the above problems. After several research experiments, the author completed the creation.

The main object of the present invention is to provide a synchronous rectification step-down and voltage stabilizing device. Through the circuit structure of the device, the back-electromotive voltage of the three-phase generator can be reduced during the recharging timing, thereby avoiding the generation of a large current. In order to meet the car locomotive system of the locomotive.

In order to achieve the above object, the synchronous rectification step-down and voltage stabilization device of the present invention is a synchronous rectification step-down and voltage stabilization device, including a three-phase generator, a complex power transistor, an LC filter, a battery, and a The second pole, and a control unit.

The three-phase generator has a three-rotor winding and a three-signal end, and includes a first rotor winding, a second rotor winding and a third rotor winding, and a corresponding one of the first signal end, the second signal end and the first Three signal ends. The plurality of power transistors do not contain a transistor in the form of a body diode, and are respectively electrically connected to the three-signal terminal. The power transistor is characterized in that the back electromotive force is greater than the battery voltage and the path is not allowed to flow current into the battery, so that it can be utilized. The characteristics maintain the average voltage around 12~14 volts.

The LC filter includes an inductor and a capacitor connected in series to the plurality of power transistors, and the output of the rectifier circuit can be filtered by using an energy exchange method. The pulsating component of the voltage is used to obtain a DC voltage to ensure that the voltage is in the form of a low voltage DC. The battery is electrically connected to the inductor and the complex power transistor and is connected in parallel to the capacitor. The Jenus diode is electrically connected to the inductor and the complex power transistor, and is connected in parallel to the capacitor and the battery to provide a breakdown voltage value, so that when the voltage exceeds a certain value, the short circuit is introduced into the ground to protect the battery from being damaged. Shock damage.

The control unit is electrically connected to the three-phase generator and the plurality of power transistors for receiving the rotor position information of the three-phase generator, providing a voltage signal, and the control unit controls the plurality of power transistor conduction and the corresponding three rotor windings according to the voltage signal. No, to cut off the reverse voltage. Therefore, when the gate voltage of the complex power transistor is turned on by the command of the control unit, the three-phase generator has current flowing into the battery according to the path.

Wherein, the above three-phase generator may be an integrated starter motor generator. When the system is started, it is in the motor mode. At this time, the engine is accelerated after the battery is supplied with energy, boost voltage, and three-phase inverter control. In addition, when the engine reaches a certain speed, the circuit automatically switches to the generator mode.

The control unit converts the voltage signal into a Pulse-Width Modulation (PWM) output, and converts the analog voltage analog signal into a pulse wave form. At the same time, the control unit can adjust the duty cycle of the pulse width modulation timing according to one of the feedback signals provided by the battery.

The plurality of power transistors may be a plurality of gold oxide half field effect transistors that do not contain a bulk diode. Which includes a first power a crystal, a second power transistor, a third power transistor, a fourth power transistor, a fifth power transistor, and a sixth power transistor. Thereby, the direction of current flowing through the power transistor can be controlled to achieve the effect of charging or discharging the battery.

In addition, in order to ensure that the device can achieve the synchronous rectification step-down and voltage regulation, the recommended value for some components, the LC filter inductance value can be 10mH, and the capacitance value can be 1uF. In addition, the voltage value of the battery can be 12V, because most of the car locomotive system uses a low-voltage DC power supply. Furthermore, the breakdown voltage of the Jenus diode can be 15.5V, which limits the upper limit of the voltage that the battery can accept to avoid the explosion of the battery due to the huge recharge current generated by the high voltage.

1‧‧‧Three-phase generator

10‧‧‧Control unit

11‧‧‧First signal end

110‧‧‧First rotor winding

12‧‧‧second signal end

120‧‧‧Second rotor winding

13‧‧‧ Third signal end

130‧‧‧ Third rotor winding

2‧‧‧Power transistor

21‧‧‧First power transistor

22‧‧‧second power transistor

23‧‧‧ Third power transistor

24‧‧‧ fourth power transistor

25‧‧‧ fifth power transistor

26‧‧‧ sixth power transistor

3‧‧‧ filter

31‧‧‧Inductance

32‧‧‧ Capacitance

4‧‧‧Battery

5‧‧‧Jenner diode

90‧‧‧Control unit

91‧‧‧Three-phase generator

911‧‧‧ first signal end

910‧‧‧First rotor winding

912‧‧‧second signal end

920‧‧‧Second rotor winding

913‧‧‧ Third signal end

930‧‧‧ Third rotor winding

92‧‧‧Power transistor

921‧‧‧First power transistor

922‧‧‧second power transistor

923‧‧‧ Third power transistor

924‧‧‧fourth power transistor

925‧‧‧ fifth power transistor

926‧‧‧ sixth power transistor

931‧‧‧ Body diode

932‧‧‧ body diode

933‧‧‧ Body diode

934‧‧‧ body diode

935‧‧‧ Body diode

936‧‧‧ Body diode

94‧‧‧Battery

G‧‧‧ gate

D‧‧‧汲

S‧‧‧ source

Figure 1 is a block diagram of a conventional motor drive and kinetic energy recovery device.

2 is a structural diagram of synchronous rectification step-down and voltage regulation according to a preferred embodiment of the present invention.

Please refer to FIG. 2, which is a structural diagram of synchronous rectification step-down and voltage regulation according to a preferred embodiment of the present invention. The figure shows a synchronous rectification step-down and voltage stabilization device comprising a three-phase generator 1, a complex power transistor 2, an LC filter 3, a battery 4, a quencher diode 5, and a control unit 10. .

In this embodiment, the three-phase generator 1 is an integrated type Start the motor generator. The characteristic is that the system is first in the motor mode when the system starts. When the vehicle runs stably to a certain speed, the engine is used as the power source, and the engine is operated in the high-efficiency operation interval with the control system to drive the generator to generate electricity and pass through the electric energy conversion system. Return energy to the battery. As shown, the three-phase generator 1 has a three-rotor winding and a three-signal terminal, and includes a first rotor winding 110, a second rotor winding 120, and a third rotor winding 130, and a corresponding one of the first signal ends. 11. A second signal terminal 12 and a third signal terminal 13.

The signal terminals 11, 12, and 13 are respectively connected to the plurality of power transistors 2, and the power transistor 2 is a gold-oxygen half field effect transistor. The first signal terminal 11 is connected to the first power battery because of the three-phase correspondence. The source of the crystal 21 and the drain of the fourth power transistor 24; the second signal terminal 12 is connected to the source of the second power transistor 22 and the drain of the fifth power transistor 25; the third signal terminal 13 is connected to the third The source of the power transistor 23 and the drain of the sixth power transistor 26 are used to control the direction of current charging or discharging of the battery. However, the power transistor 2 used in the present invention is a line type without a body diode. Therefore, even if the back electromotive force is greater than the battery voltage, and there is no path for the current to flow into the battery, the characteristic can be used to maintain the average voltage at 12~. Around 14 volts.

Next, the LC filter 3 and the three-phase complex power transistor 2 are respectively connected in series, and include an inductor 31 having a value of 10 mH and a capacitor 32 having a value of 1 uF, which can be used to filter out the output voltage of the rectifier circuit by using an energy exchange method. The pulsating component obtains a DC voltage to ensure that the voltage is in the form of a low voltage DC. In addition, a parallel connection between the two ends of the capacitor 32 The diode 5 is electrically connected to the inductor 31 and the complex power transistor 2. The breakdown voltage of the Zener diode 5 is 15.5V as shown in the figure, which limits the upper limit of the voltage that the battery can accept, and when biased When the breakdown voltage is reached, the reverse current increases, but the voltage values at both ends are maintained at a certain value, and therefore, the battery 4 is protected to avoid damage from the surge.

Finally, the battery 4 is connected in parallel with the capacitor 32 and the inductor diode 5, and is electrically connected to the inductor 31 and the complex power transistor 2. The battery 4 in the embodiment is a 12 volt battery, which is suitable for power generation of today's automobile locomotives. system.

In addition to the overall circuit architecture, a control unit 10 is further connected to electrically connect the three-phase generator 1 and the plurality of power transistors 2 for receiving the rotor position information of the three-phase generator 1, providing a voltage signal, and providing a voltage The signal is converted into a pulse width modulation timing output, which is combined with the integrated starter motor generator used in the present case to provide variable frequency drive control. In addition, the control unit 10 controls the gate voltage of the power transistor 2 corresponding to the three rotor windings 110, 120, 130 according to the pulse width modulation timing to command it to be turned on or off. Only in the case of conduction, the three-phase generator has a current. Flow into the battery according to the path to cut off the reverse voltage.

Moreover, another function of the control unit 10 is to receive a feedback signal provided by the battery 4 for adjusting the duty cycle of the pulse width modulation timing. Thereby, the chain wave signal generated by the capacitor can be reduced.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

1‧‧‧Three-phase generator

10‧‧‧Control unit

11‧‧‧First signal end

110‧‧‧First rotor winding

12‧‧‧second signal end

120‧‧‧Second rotor winding

13‧‧‧ Third signal end

130‧‧‧ Third rotor winding

2‧‧‧Power transistor

21‧‧‧First power transistor

22‧‧‧second power transistor

23‧‧‧ Third power transistor

24‧‧‧ fourth power transistor

25‧‧‧ fifth power transistor

26‧‧‧ sixth power transistor

3‧‧‧ filter

31‧‧‧Inductance

32‧‧‧ Capacitance

4‧‧‧Battery

5‧‧‧Jenner diode

G‧‧‧ gate

D‧‧‧汲

S‧‧‧ source

Claims (9)

A synchronous rectification step-down and voltage stabilizing device comprises: a three-phase generator having three rotor windings and three signal terminals, comprising a first rotor winding, a second rotor winding and a third rotor winding, and corresponding thereto a first signal terminal, a second signal terminal and a third signal terminal; the plurality of power transistors are transistors not containing the body diode form, respectively correspondingly electrically connected to the three signal terminals; an LC filter Including an inductor and a capacitor connected in series with the plurality of power transistors to ensure that the voltage is in the form of low voltage DC; a battery electrically coupled to the inductor and the plurality of power transistors and connected in parallel to the capacitor; An inductor diode electrically coupled to the inductor and the plurality of power transistors, and coupled in parallel with the capacitor and the battery to protect the battery from shock damage; and a control unit electrically connecting the three a phase generator and the plurality of power transistors for receiving rotor position information of the three-phase generator, providing a voltage signal, and the control unit controls the corresponding three rotors according to the voltage signal Group of the plurality of power transistor is turned on or not, to cut off the reverse voltage. The synchronous rectification step-down and voltage regulator device according to claim 1, wherein the three-phase generator is an integrated starter motor generator. The synchronous rectification step-down and voltage regulator device of claim 1, wherein the control unit converts the voltage signal into a pulse width modulation timing output. The synchronous rectification step-down and voltage regulator device according to claim 3, wherein the control unit is configured to adjust a duty cycle of the pulse width modulation timing according to a feedback signal provided by the battery. The synchronous rectification step-down and voltage regulation device according to claim 1, wherein the complex power electro-crystal system is a plurality of gold-oxygen half-field effect transistors not including a body diode. The synchronous rectification step-down and voltage stabilization device of claim 1, wherein the complex power transistor comprises a first power transistor, a second power transistor, a third power transistor, and a first power transistor. A four power transistor, a fifth power transistor, and a sixth power transistor. The synchronous rectification step-down and voltage stabilization device according to claim 1, wherein the inductance value of the LC filter is 10 mH, and the capacitance value is 1 uF. The synchronous rectification step-down and voltage regulator device according to claim 1, wherein the voltage value of the battery is 12V. The synchronous rectification step-down and voltage regulator device according to claim 1, wherein the breakdown voltage of the arrester diode is 15.5V.