TWM477732U - Quadrature alternating current power conversion device - Google Patents

Description

AC power conversion device

This creation is related to power conversion; in particular, it is a kind of AC power conversion device.

According to the conventional AC power conversion device, a rectifier circuit and an output capacitor and an inverter are generally included, so that the rectifier circuit converts an AC power source into a DC power source, and the output capacitor is connected across the output end of the rectifier circuit. And the inverter is connected to the output capacitor and then connected to a load.

When the AC power conversion device is activated, the input voltage of the AC power source and the input current are often in a different phase, resulting in a low power factor and a serious current total harmonic distortion. In addition, only when the voltage of the DC power supply outputted by the rectifier circuit is higher than the voltage of the output capacitor, the output capacitor is charged, thereby causing the output capacitor charging time to be shortened, resulting in the diode in the rectifier circuit. The on-time is also shortened, which leads to an increase in the peak value of the on-current, resulting in distortion of the input current waveform and a decrease in the power factor, which in turn causes the current response speed of the inverter to be affected, so that the AC output finally outputs the load. Can be severely distorted.

In view of this, the purpose of the present invention is to provide an AC power conversion device, which has the advantages of high power factor and can simultaneously satisfy the requirements of fast response and low chopping output voltage.

In order to achieve the above objectives, the creation of AC power supply The conversion device is configured to convert the electrical energy of an AC power source to a load, and includes a rectifier circuit, an active power factor correction circuit, an automatic charge pump circuit, and a power inverter circuit. . The input side of the rectifier circuit is connected to the AC power source for receiving the power of the AC power source, and then converted into DC power and outputted from the output side thereof. In addition, the output side has a positive terminal and a negative terminal. The active power factor correction circuit is connected to the output end of the rectifier circuit for receiving the power outputted by the rectifier circuit and outputting the power factor, and includes a first diode, the negative pole of which is connected to the positive terminal; a first capacitor, one end of which is connected to the anode of the first diode; an electronic switch, one end of which is connected to the other end of the first capacitor, and the other end of the electronic switch is connected to the negative terminal; a first inductor One end of the first diode is connected to the cathode of the first diode and the positive terminal, and the other end of the first inductor is connected to the connection of the first capacitor and the electronic switch; a second diode, The positive pole is connected to the connection between the electronic switch and the negative terminal; a second inductor is connected at one end to the junction of the anode of the first diode and the first capacitor, and the other end is connected to the second diode The negative electrode is connected. The automatic charge pumping circuit is connected to the active power factor correction circuit, and is configured to receive the power output by the active power factor correction circuit and adjust the output, and includes a third diode, the positive pole and the second a cathode of the diode is connected to the junction of the second inductor, and a cathode is electrically connected to the junction of the second inductor, the anode of the first diode, and the first capacitor; a second capacitor One end is connected to the negative electrode of the third diode; a third inductor is connected at one end to the other end of the first capacitor, and the other end is electrically connected to the connection between the negative electrode of the third diode and the second capacitor An equivalent capacitor having one end connected to the junction of the second capacitor and the third inductor, and the other end being opposite to the anode of the third diode, the cathode of the second diode, and the second The connection of the inductor is connected; the inverter circuit is electrically connected to the automatic charge pumping circuit The equivalent capacitor is connected to the load for receiving the electrical energy output by the automatic charge pumping circuit, and is converted into AC power of a predetermined frequency, and then outputted to the load.

Therefore, through the above design, the power factor can be improved during power conversion, and the advantages of fast response and low chopping output voltage are also taken into consideration.

10‧‧‧Rectifier circuit

12‧‧‧ Positive terminal

14‧‧‧Negative terminal

20‧‧‧Active power factor correction circuit

30‧‧‧Automatic charge pumping circuit

40, 50‧‧‧ inverter circuit

100‧‧‧AC power supply

200‧‧‧load

C1~C5‧‧‧ capacitor

L1~L3‧‧‧Inductance

D1~D5‧‧‧ diode

SW‧‧‧Electronic switch

S1~S6‧‧‧Toggle switch

1 is a circuit diagram of an AC power conversion device according to a preferred embodiment of the present invention; FIGS. 2A, B to 5A, and B are equivalent circuit diagrams of respective steps; and FIG. 6 is an AC power supply according to another preferred embodiment of the present invention. a circuit diagram of the conversion device;

In order to explain the present invention more clearly, the preferred embodiment will be described in detail with reference to the drawings. As shown in FIG. 1 , the AC power conversion device of the preferred embodiment is used to convert the power of an AC power source 100 and output it to a load 200. The AC power conversion device includes a rectifier circuit 10, an active power factor correction circuit 20, an automatic charge pump circuit 30, and a power inverter circuit 40. The rectifier circuit 10 is a bridge rectifier in the embodiment, and the input side is connected to the AC power source 100, and is configured to receive the power of the AC power source 100, convert it into DC power, and output it from the output side. In addition, the output side is divided into a positive terminal 12 and a one according to the polarity of the power supply. Negative terminal 14.

The active power factor correction circuit 20 is connected to the output end of the rectifier circuit 10 for receiving the power output by the rectifier circuit 10 and outputting the power factor, and includes two diodes (the first diode D1) And a second diode D2), a capacitor (first capacitor C1), two inductors (first inductor L1 and second inductor L2), and an electronic switch SW. The connection relationship of the components is as follows: the negative electrode of the first diode D1 is connected to the positive terminal 12.

One end of the first capacitor C1 is connected to the anode of the first diode D1.

One end of the electronic switch SW is connected to the other end of the first capacitor C1, and the other end is connected to the negative end 14 .

One end of the first inductor L1 is connected to the junction of the cathode of the first diode D1 and the positive terminal 12, and the other end of the first inductor L1 is connected to the junction of the first capacitor C1 and the electronic switch SW. .

The positive electrode of the second diode D2 is connected to the connection of the electronic switch SW and the negative terminal 14.

One end of the second inductor L2 is connected to the junction of the anode of the first diode D1 and the first capacitor C1, and the other end is connected to the cathode of the second diode D2.

The automatic charge pumping circuit 30 is connected to the active power factor correction circuit 20 for receiving the power output of the active power factor correction circuit 20 and adjusting the output, and includes three diodes (third diode) D3, fourth diode D4 and fifth diode D5), three capacitors (second capacitor C2, third capacitor C3, and fourth capacitor C4) and one inductor (third inductor L3). The connection relationship of the components is as follows: the anode of the fifth diode D5 is connected to the second inductor L2, the anode of the first diode D1, and the junction of the first capacitor C1.

The anode of the third diode D3 is connected to the junction of the cathode of the second diode D2 and the second inductor L2, and the cathode is connected to the cathode of the fifth diode D2 to transmit the fifth The pole body D5 is electrically connected to the junction of the anode of the first diode D1, the second inductor L2, and the first capacitor C1.

One end of the second capacitor C2 is connected to the junction of the negative electrode of the third diode D3 and the negative electrode of the fifth diode D5.

The positive electrode of the fourth diode D4 is connected to the junction of the negative electrode of the third diode D3, the negative electrode of the fifth diode D5, and the second capacitor C2.

One end of the third inductor L3 is connected to the other end of the first capacitor C1, and the other end is connected to the cathode of the fourth diode D4, and is electrically connected to the third diode through the fourth diode D4. The junction of the negative electrode of D3, the negative electrode of the fifth diode D5, and the second capacitor C2.

The third capacitor C3 is connected to one end of the fourth capacitor C4, and the other end of the third capacitor C3 is connected to the junction of the second capacitor C2 and the third inductor L3, and the fourth capacitor C4 is connected to another One end is connected to a junction of the anode of the third diode D3, the cathode of the second diode D2, and the second inductor L2.

The inverter circuit 40 is electrically connected to the automatic charge pumping circuit 30 and connected to the load 200 for receiving the power output by the automatic charge pumping circuit 30, and converting it into AC power of a predetermined frequency and outputting the power to the load 200. . In the embodiment, the inverter circuit 40 is a half bridge, and includes a first switch S1 and a second switch S2, and the first switch S1 and the second switch S2 are opposite to each other. connection. In addition, the other end of the first switch S1 is connected to the connection of the second capacitor C2, the third capacitor C3 and the third inductor L3, and the other end of the second switch S2 is connected to the fourth capacitor. C4, the anode of the third diode D3, the second two The cathode of the pole body D2 and the junction of the second inductor L2 are connected.

In this embodiment, the capacitances C1 to C4, the inductances L1 to L3, the input voltage, the switching frequency of the electronic switch SW and the switches S1 and S2, and the specifications of the load 200 are as follows:

Therefore, through the above structural design and specifications, one end of the load 200 is connected to the connection of the third capacitor C3 and the fourth capacitor C4, and the other end of the load 200 is connected to the first switch. The connection between S1 and the second switch S2 can be improved by using the power conversion method described below, and the effect of fast response and low chopping output voltage can be achieved, and the method includes the following steps: Referring to FIG. 2A and FIG. 2B, the electronic switch SW is turned on, and the DC power outputted by the rectifier circuit 10 charges the first inductor L1, and the energy stored by the first capacitor C1 charges the second inductor L2. The third capacitor C3 and the fourth capacitor C4 are charged by the storage of the second capacitor C2 and the third inductor L3, so that the third capacitor C3 and the fourth capacitor C4 are charged. The energy storage releases the load through the inverter circuit 40. Further, if the AC power conversion device operates in the positive half-wave-on state, the second change-over switch S2 is turned on, and at this time, the fourth capacitor C4 discharges the load 200, and the equivalent circuit thereof is as shown in FIG. 2A. If the AC power conversion device operates in the negative half-wave-on state, the first switch S1 is turned on. At this time, the third capacitor C3 releases the load 200, and the equivalent circuit is as shown in FIG. 2B.

B. Referring to FIG. 3A and FIG. 3B, the electronic switch SW is disconnected. The first capacitor C1 is charged, and the second inductor L2 is charged to the third inductor L3 and the second capacitor. C2 is charged, and the energy storage of the second inductor L2 is conducted to the third capacitor C3 and the fourth capacitor C4 through the resonant circuit formed by the second capacitor C2 and the third inductor L3, so that the third capacitor The energy storage of C3 and the fourth capacitor C4 is continuously discharged to the load 200 through the inverter circuit 40 in accordance with the positive half wave or negative half waveguide pass state.

C. Referring to FIG. 4A and FIG. 4B, the first inductor L1 stops. After the release energy, the first diode D1 is turned off, and after the second inductor L2 stops releasing energy, the fifth diode D5 is turned off. At this time, the second capacitor C2 forms a resonant circuit with the third inductor L3, so that the energy storage of the third inductor L3 charges the second capacitor C2, and the polarity of the second capacitor C2 is reversed. The energy storage of the third capacitor C3 and the fourth capacitor C4 is continuously discharged to the load 200 through the inverter circuit 40 according to the positive half wave or the negative half waveguide pass state.

D. When the voltage across the third inductor C3 is greater than the third capacitor C3 When the total voltage across the fourth capacitor C4 is exceeded, the third diode D3 is turned on, so that the second capacitor C2 and the third inductor L3 generate a voltage that is opposite to the step C, and the third capacitor C3 is The fourth capacitor C4 is charged, so that the energy storage of the third capacitor C3 and the fourth capacitor C4 is continuously discharged to the load 200 through the inverter circuit 40 according to the positive half wave or the negative half waveguide pass state.

In addition, after performing step A to step D once, it means Complete a cycle of action. Therefore, in the case where the AC power conversion device is continuously operated, after step D, the steps A to D are repeatedly performed until the AC power conversion device stops operating.

Thereby, through the above-mentioned automatic charge pumping circuit 30 In each actuation cycle, the voltage across the second capacitor C2 can automatically provide a negative potential, and the third diode D3 is turned on to change the overall circuit structure before and after the third diode D3 is turned on. The purpose of fast response and low chopping output voltage can be achieved, and the switching of the electronic switch SW can achieve the purpose of improving the power factor.

In addition, the fourth diode D4 and the fifth diode D5 The design can effectively prevent the circuit from generating reflow to affect the active power factor correction circuit 20 and the automatic charge pumping circuit 30, thereby making the overall circuit more stable, thereby improving the energy conversion of the AC power conversion device. Suppress the effect of chopping. Of course, in actual implementation, even if the fourth diode D4 and the fifth diode D5 are not used, the purpose of improving power conversion efficiency and suppressing chopping can be achieved.

Furthermore, the AC power conversion device of this creation is applicable to The half bridge type inverter circuit 40 is also applicable to the full bridge type inverter circuit 50 as shown in FIG. 6, and the difference from the foregoing is that the full bridge type inverter circuit 50 has the first switch S3 to The fourth switch C6 and the fourth capacitor C4 are regarded as an equivalent capacitor C5, and the connection relationship is as follows: the first switch S3 is connected to one end of the third switch S5, and the connection The second changeover switch S4 is connected to one end of the fourth changeover switch S6. In addition, the other end of the first switch S3 and the second switch S4 are connected to the connection of the equivalent capacitor C5, the second capacitor C2 and the third inductor L3, and the third switch S5 and the The other end of the fourth switch S6 is opposite to the equivalent capacitor C5 and the third diode D3. The positive electrode, the negative electrode of the second diode D2, and the junction of the second inductor L2 are connected.

In this way, through the above structural design, the negative will be used when using One end of the load 200 is connected to the junction of the first changeover switch S3 and the third changeover switch S5, and the other end is connected to the connection of the second changeover switch S4 and the fourth changeover switch S6, and utilize the foregoing The power switching method can also achieve high power factor, fast response and low chopping output voltage.

The above description is only a preferred embodiment of the present invention, and In the case where the electrical characteristics and the circuit operation principle are the same, the position and the number of the above-mentioned circuit components, and the equivalent circuit variations which are applied to the scope of the present specification and the patent application are included in the scope of the patent.

10‧‧‧Rectifier circuit

12‧‧‧ Positive terminal

14‧‧‧Negative terminal

20‧‧‧Active power factor correction circuit

30‧‧‧Automatic charge pumping circuit

40‧‧‧Inverter circuit

100‧‧‧AC power supply

200‧‧‧load

C1~C4‧‧‧ capacitor

L1~L3‧‧‧Inductance

D1~D5‧‧‧ diode

SW‧‧‧Electronic switch

S1, S2‧‧‧ switch

Claims (7)

An AC power conversion device for converting an electric energy of an AC power source to a load, and comprising: a rectifying circuit, wherein an input side is connected to the AC power source for receiving the electric energy of the AC power source, and then converted into The DC power is outputted from the output side thereof; in addition, the output side has a positive terminal and a negative terminal; an active power factor correction circuit is connected to the output end of the rectifier circuit for receiving the output of the rectifier circuit And outputting the power factor and increasing the power factor, and comprising: a first diode, the negative pole is connected to the positive terminal; a first capacitor, one end of which is connected to the anode of the first diode; an electronic switch, One end of the electronic switch is connected to the other end of the first capacitor, and the other end of the electronic switch is connected to the negative end; a first inductor has one end connected to the cathode of the first diode and the junction of the positive terminal. The other end of the first inductor is connected to the connection of the first capacitor and the electronic switch; a second diode has a positive pole connected to the connection of the electronic switch and the negative terminal; One end is connected to the junction of the anode of the first diode and the first capacitor, and the other end is connected to the cathode of the second diode; an automatic charge pump circuit, and The active power factor correction circuit is connected to receive the power output of the active power factor correction circuit, and then adjusts the output, and includes: a third diode, the anode of which is connected to the junction of the cathode of the second diode and the second inductor, and the anode and the second inductor, the anode of the first diode, and the first capacitor The second capacitor has one end connected to the negative pole of the third diode; a third inductor has one end connected to the other end of the first capacitor, and the other end is electrically connected to the first a junction of the cathode of the triode and the second capacitor; an equivalent capacitor having one end connected to the junction of the second capacitor and the third inductor, and the other end being connected to the anode of the third diode a connection between the cathode of the second diode and the second inductor; a power inverter circuit electrically connected to the equivalent capacitance of the automatic charge pumping circuit and connected to the load for Receiving the electric energy output by the automatic charge pumping circuit and converting it into AC power of a predetermined frequency, and outputting the power to the load. The AC power conversion device of claim 1, wherein the equivalent capacitance is composed of a third capacitor and a fourth capacitor, and the third capacitor is connected to one end of the fourth capacitor, and the inverse The variable circuit includes a first switch and a second switch, and the first switch is connected to one end of the second switch; in addition, the third capacitor and the other end of the first switch are connected to the first switch a second capacitor is connected to the connection of the third inductor, and the fourth capacitor and the other end of the second switch are opposite to the anode of the third diode, the cathode of the second diode, and the second inductor Connecting at the connection; further, one end of the load is connected to the third capacitor and the fourth capacitor The other end is connected to the junction of the first switch and the second switch. The AC power conversion device of claim 1, wherein the inverter circuit comprises a first switch, a second switch, a third switch, and a fourth switch; the first switch and the switch One end of the third switching switch is connected, and the second switching switch is connected to one end of the fourth switching switch; in addition, the other end of the first switching switch and the second switching switch and the equivalent capacitance, the first a second capacitor is connected to the connection of the third inductor, and the other end of the third switch and the fourth switch is opposite to the equivalent capacitor, the anode of the third diode, and the second diode Connecting the connection between the negative pole and the second inductor; further, one end of the load is connected to the connection of the first switch and the third switch, and the other end is connected to the second switch and the fourth The junction of the diverter switch. The AC power conversion device of claim 1, wherein the automatic charge pumping circuit further comprises a fourth diode, one end of which is connected to the junction of the cathode of the third diode and the second capacitor. The other end is connected to the third inductor, and the third inductor is electrically connected to the junction of the cathode of the third diode and the second capacitor through the fourth diode. The AC power conversion device of claim 4, wherein the anode of the fourth diode is connected to the junction of the cathode of the third diode and the second capacitor, and the cathode of the fourth diode is connected to the third inductance. The AC power conversion device of claim 1, wherein the automatic charge pumping circuit further comprises a fifth diode, one end of which is connected to the second power Sense, the junction of the anode of the first diode and the first capacitor, and the other end is connected to the junction of the cathode of the third diode and the second capacitor, and the third diode The cathode and the second capacitor are electrically connected to the junction of the fifth diode and the second inductor, the anode of the first diode, and the first capacitor. The AC power conversion device of claim 6, wherein the anode of the fifth diode is connected to the second inductor, the anode of the first diode, and the junction of the first capacitor, and the anode is connected. To the junction of the negative electrode of the third diode and the second capacitor.