A three-phase rectifier circuit using MOS transistors

Abstract

The utility model belongs to the technical field of rectifier circuit, concretely is a kind of MOS tube three-phase rectifier circuit, including three-phase ac power supply, MOS tube Q1, MOS tube Q2, MOS tube Q3, MOS tube Q4, MOS tube Q5, MOS tube Q6, first control unit, second control unit and third control unit;Three-phase ac power supply includes U phase, V phase and W phase;The source of MOS tube Q1 and the drain of MOS tube Q2 are connected with U phase respectively;The source of MOS tube Q3 and the drain of MOS tube Q4 are connected with V phase respectively;The source of MOS tube Q5 and the drain of MOS tube Q6 are connected with W phase respectively;First control unit is connected with the grid of MOS tube Q1, the grid of MOS tube Q2, the drain of MOS tube Q1 respectively.The rectifier circuit of the utility model has the effect of low voltage drop, low power consumption, low heat output, satisfies the application demand of coal mine self-generation class robot.

Description

Technical Field

[0001] This utility model belongs to the field of rectifier circuit technology, specifically a MOS transistor three-phase rectifier circuit. Background Technology

[0002] In self-generating robots for coal mines, the rectifier circuit is a crucial circuit that converts the alternating current (AC) output from the generator into direct current (DC). In existing general three-phase rectifier technology, the rectifier circuit typically consists of six rectifier diodes. Although its structure is simple and its cost is low, its characteristics of high voltage drop, high power consumption, heat generation, and large size do not meet the robot's requirements for high efficiency, low power consumption, low heat generation, and small size when used in self-generating robots.

[0003] Therefore, there is an urgent need for a rectifier circuit with low voltage drop, low power consumption, low heat generation, and small size to meet the needs of self-generating robot applications. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a MOS transistor three-phase rectifier circuit, thus fulfilling the requirement of self-generating robots for a three-phase rectifier circuit.

[0005] This utility model discloses a three-phase rectifier circuit using MOSFETs, comprising a three-phase AC power supply, MOSFETs Q1, Q2, Q3, Q4, Q5, and Q6, a first control unit, a second control unit, and a third control unit. The three-phase AC power supply includes a U phase, a V phase, and a W phase. The source of MOSFET Q1 and the drain of MOSFET Q2 are respectively connected to the U phase; the source of MOSFET Q3 and the drain of MOSFET Q4 are respectively connected to the V phase; the source of MOSFET Q5 and the drain of MOSFET Q6 are respectively connected to the W phase; the first control unit is connected to the gate of MOSFET Q1, the gate of MOSFET Q2, the drain of MOSFET Q6, and the... The source, U phase, V phase, and W phase of MOSFET Q2 are connected; the second control unit is connected to the gate of MOSFET Q3, the gate of MOSFET Q4, the drain of MOSFET Q3, the source of MOSFET Q4, the U phase, the V phase, and the W phase, respectively; the third control unit is connected to the gate of MOSFET Q5, the gate of MOSFET Q6, the drain of MOSFET Q5, the source of MOSFET Q6, the U phase, the V phase, and the W phase, respectively; the drain of MOSFET Q1 is connected to the drain of MOSFET Q3 and the drain of MOSFET Q5, and serves as the DC output VOUT terminal; the source of MOSFET Q2 is connected to the source of MOSFET Q4 and the source of MOSFET Q6, and serves as the DC output GND terminal.

[0006] Furthermore, it also includes an output power indicator unit; the output power indicator unit includes a resistor R7 and a light-emitting diode; one end of the resistor R7 is connected to the DC output VOUT terminal, and the other end is connected to the anode of the light-emitting diode; the cathode of the light-emitting diode is connected to the DC output GND terminal.

[0007] Furthermore, it also includes capacitor C4; the positive terminal of capacitor C4 is connected to the DC output VOUT terminal, and the negative terminal of capacitor C4 is connected to the DC output GND terminal; capacitor C4 is an output filter capacitor.

[0008] Furthermore, the first control unit includes a rectifier control chip IC1; pin 1 of the rectifier control chip IC1 is connected to phase V and phase W through a first input voltage sampling circuit; pin 3 of the rectifier control chip IC1 is electrically connected to the gate of MOSFET Q2; pin 5 of the rectifier control chip IC1 is electrically connected to the DC output GND terminal; pin 6 of the rectifier control chip IC1 is electrically connected to the DC output VOUT terminal; pins 5 and 6 of the rectifier control chip IC1 are electrically connected through capacitor C1; pin 7 of the rectifier control chip IC1 is electrically connected to the gate of MOSFET Q1; and pin 8 of the rectifier control chip IC1 is electrically connected to phase U.

[0009] Furthermore, the first input voltage sampling circuit includes diodes D1, D2, and D3, resistors R1 and R2; pin 1 of the rectifier control chip IC1 is electrically connected to one end of resistor R1, one end of resistor R2, the anode of diode D1, the anode of diode D2, and the cathode of diode D3, respectively; the other end of resistor R1 and the cathode of diode D1 are electrically connected to the V phase; the other end of resistor R2 and the cathode of diode D2 are electrically connected to the W phase; and the anode of diode D3 is electrically connected to the DC output GND terminal.

[0010] Furthermore, the second control unit includes a rectifier control chip IC2; pin 1 of the rectifier control chip IC2 is connected to phase U and phase W through a second input voltage sampling circuit; pin 3 of the rectifier control chip IC2 is electrically connected to the gate of MOSFET Q4; pin 5 of the rectifier control chip IC2 is electrically connected to the DC output GND terminal; pin 6 of the rectifier control chip IC2 is electrically connected to the DC output VOUT terminal; pins 5 and 6 of the rectifier control chip IC2 are electrically connected through capacitor C2; pin 7 of the rectifier control chip IC2 is electrically connected to the gate of MOSFET Q3; and pin 8 of the rectifier control chip IC2 is electrically connected to phase V.

[0011] Furthermore, the second input voltage sampling circuit includes diodes D4, D5, and D6, and resistors R3 and R4. Pin 1 of the rectifier control chip IC2 is electrically connected to one end of resistor R3, one end of resistor R4, the anode of diode D4, the anode of diode D5, and the cathode of diode D6, respectively. The other end of resistor R3 and the cathode of diode D4 are electrically connected to the U phase, the other end of resistor R4 and the cathode of diode D5 are electrically connected to the W phase, and the anode of diode D6 is electrically connected to the DC output GND terminal.

[0012] Furthermore, the third control unit includes a rectifier control chip IC3; pin 1 of the rectifier control chip IC3 is connected to phase U and phase V through a third input voltage sampling circuit; pin 3 of the rectifier control chip IC3 is electrically connected to the gate of MOSFET Q6; pin 5 of the rectifier control chip IC3 is electrically connected to the DC output GND terminal; pin 6 of the rectifier control chip IC3 is electrically connected to the DC output VOUT terminal; pins 5 and 6 of the rectifier control chip IC3 are connected through capacitor C3; pin 7 of the rectifier control chip IC3 is electrically connected to the gate of MOSFET Q5; and pin 8 of the rectifier control chip IC3 is electrically connected to phase W.

[0013] Furthermore, the third input voltage sampling circuit includes diodes D7, D8, and D9, resistors R5 and R6; pin 1 of the rectifier control chip IC3 is electrically connected to one end of resistor R5, one end of resistor R6, the anode of diode D7, the anode of diode D8, and the cathode of diode D9, respectively; the other end of resistor R5 and the cathode of diode D7 are electrically connected to the U phase; the other end of resistor R6 and the cathode of diode D8 are electrically connected to the V phase; and the anode of diode D9 is electrically connected to the DC output GND terminal.

[0014] The beneficial effects of this utility model are as follows: The rectifier circuit of this utility model achieves the goals of low voltage drop, low power consumption, low heat generation and small size, and the rectification efficiency can reach more than 97%, which meets the application needs of coal mine self-generating robots. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a block diagram illustrating the three-phase rectification principle of the MOSFET of this utility model.

[0017] Figure 2 This is an overall diagram of the MOS transistor three-phase rectifier circuit of this utility model. Detailed Implementation

[0018] The technical solutions in the embodiments of this utility model are described clearly and completely below. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0019] The purpose of this invention is to provide a MOS transistor three-phase rectifier circuit, which solves the requirement of self-generating robots for three-phase rectifier circuits.

[0020] This utility model discloses a three-phase rectifier circuit using MOSFETs, comprising a three-phase AC power supply, MOSFETs Q1, Q2, Q3, Q4, Q5, and Q6, a first control unit, a second control unit, a third control unit, an output power indicator unit, and an output filter capacitor C4; the three-phase AC power supply includes U-phase, V-phase, and W-phase; as shown... Figure 1 As shown.

[0021] The source of MOSFET Q1 and the drain of MOSFET Q2 are connected to phase U; the source of MOSFET Q3 and the drain of MOSFET Q4 are connected to phase V; the source of MOSFET Q5 and the drain of MOSFET Q6 are connected to phase W; the drains of MOSFET Q1, MOSFET Q3, and MOSFET Q5 are connected together and serve as the DC output VOUT terminal; the sources of MOSFET Q2, MOSFET Q4, and MOSFET Q6 are connected together and serve as the DC output GND terminal.

[0022] The output power indicator unit includes a resistor R7 and a light-emitting diode (LED). One end of the resistor R7 is connected to the DC output VOUT terminal, and the other end is connected to the anode of the LED. The cathode of the LED is connected to the DC output GND terminal. The positive terminal of the output filter capacitor C4 is connected to the DC output VOUT terminal, and the negative terminal of the output filter capacitor C4 is connected to the DC output GND terminal.

[0023] The first control unit, the second control unit, and the third control unit have the same structure, but they control the U phase, V phase, and W phase of the three-phase AC power supply, respectively.

[0024] The first control unit includes a rectifier control chip IC1 and a first input voltage sampling circuit. Pin 1 of the rectifier control chip IC1 is connected to phase V and phase W through the first input voltage sampling circuit; pin 3 of the rectifier control chip IC1 is electrically connected to the gate of MOSFET Q2; pin 5 of the rectifier control chip IC1 is electrically connected to the DC output GND terminal; pin 6 of the rectifier control chip IC1 is electrically connected to the DC output VOUT terminal; pins 5 and 6 of the rectifier control chip IC1 are connected through capacitor C1; pin 7 of the rectifier control chip IC1 is electrically connected to the gate of MOSFET Q1; pin 8 of the rectifier control chip IC1 is electrically connected to phase U, such as... Figure 2 As shown.

[0025] The first input voltage sampling circuit includes diodes D1, D2, and D3, and resistors R1 and R2. Pin 1 of the rectifier control chip IC1 is electrically connected to one end of resistor R1, one end of resistor R2, the anode of diode D1, the anode of diode D2, and the cathode of diode D3, respectively. The other end of resistor R1 and the cathode of diode D1 are electrically connected to the V phase, the other end of resistor R2 and the cathode of diode D2 are electrically connected to the W phase, and the anode of diode D3 is electrically connected to the DC output GND terminal.

[0026] The first control unit controls the gates of MOSFETs Q1 and Q2 respectively. Pin 1 of the rectifier control chip IC1 is the voltage sampling input pin, and pin 8 of the rectifier control chip IC1 is the sampling reference voltage input pin. When a forward voltage of phase U is sampled, pin 7 of the rectifier control chip IC1 is high, turning on MOSFET Q1, and pin 3 of the rectifier control chip IC1 is low, turning off MOSFET Q2. When a reverse voltage of phase U is sampled, pin 7 of the rectifier control chip IC1 is low, turning off MOSFET Q1, and pin 3 of the rectifier control chip IC1 is low, turning on MOSFET Q2. This achieves the switching control of MOSFETs Q1 and Q2 for phase U rectification, completing the phase U rectification operation.

[0027] The second control unit includes a rectifier control chip IC2 and a second input voltage sampling circuit. Pin 1 of the rectifier control chip IC2 is connected to phase U and phase W through the second input voltage sampling circuit; pin 3 of the rectifier control chip IC2 is electrically connected to the gate of MOSFET Q4; pin 5 of the rectifier control chip IC2 is electrically connected to the DC output GND terminal; pin 6 of the rectifier control chip IC2 is electrically connected to the DC output VOUT terminal; pins 5 and 6 of the rectifier control chip IC2 are connected through capacitor C2; pin 7 of the rectifier control chip IC2 is electrically connected to the gate of MOSFET Q3; and pin 8 of the rectifier control chip IC2 is electrically connected to phase V.

[0028] The second input voltage sampling circuit includes diodes D4, D5, and D6, and resistors R3 and R4. Pin 1 of the rectifier control chip IC2 is electrically connected to one end of resistor R3, one end of resistor R4, the anode of diode D4, the anode of diode D5, and the cathode of diode D6, respectively. The other end of resistor R3 and the cathode of diode D4 are electrically connected to the U phase, the other end of resistor R4 and the cathode of diode D5 are electrically connected to the W phase, and the anode of diode D6 is electrically connected to the DC output GND terminal.

[0029] The second control unit controls the gates of MOSFETs Q3 and Q4 respectively. Pin 1 of the rectifier control chip IC2 is the voltage sampling input pin, and pin 8 is the sampling reference voltage input pin. When a forward voltage of phase V is sampled, pin 7 of the rectifier control chip IC2 is high, turning on MOSFET Q3, and pin 3 is low, turning off MOSFET Q4. When a reverse voltage of phase V is sampled, pin 7 of the rectifier control chip IC2 is low, turning off MOSFET Q3, and pin 3 is low, turning on MOSFET Q4. This achieves the switching control of MOSFETs Q3 and Q4 for phase V rectification, completing the phase V rectification operation.

[0030] The third control unit includes a rectifier control chip IC3 and a third input voltage sampling circuit. Pin 1 of the rectifier control chip IC3 is connected to phase U and phase V through the third input voltage sampling circuit; pin 3 of the rectifier control chip IC3 is electrically connected to the gate of MOSFET Q6; pin 5 of the rectifier control chip IC3 is electrically connected to the DC output GND terminal; pin 6 of the rectifier control chip IC3 is electrically connected to the DC output VOUT terminal; pins 5 and 6 of the rectifier control chip IC3 are connected through capacitor C3; pin 7 of the rectifier control chip IC3 is electrically connected to the gate of MOSFET Q5; and pin 8 of the rectifier control chip IC3 is electrically connected to phase W.

[0031] The third input voltage sampling circuit includes diodes D7, D8, and D9, resistors R5 and R6. Pin 1 of the rectifier control chip IC3 is electrically connected to one end of resistor R5, one end of resistor R6, the anode of diode D7, the anode of diode D8, and the cathode of diode D9, respectively. The other end of resistor R5 and the cathode of diode D7 are electrically connected to the U phase, the other end of resistor R6 and the cathode of diode D8 are electrically connected to the V phase, and the anode of diode D9 is electrically connected to the DC output GND terminal.

[0032] The third control unit controls the gates of MOSFETs Q5 and Q6 respectively. Pin 1 of the rectifier control chip IC3 is the voltage sampling input pin, and pin 8 of the rectifier control chip IC3 is the sampling reference voltage input pin. When a forward voltage of phase W is sampled, pin 7 of the rectifier control chip IC3 is high, turning on MOSFET Q5, and pin 3 of the rectifier control chip IC3 is low, turning off MOSFET Q6. When a reverse voltage of phase W is sampled, pin 7 of the rectifier control chip IC3 is low, turning off MOSFET Q5, and pin 3 of the rectifier control chip IC3 is low, turning on MOSFET Q6. This achieves the switching control of MOSFETs Q5 and Q6 for phase W rectification, completing the rectification operation of phase W.

[0033] The three control units of this invention collect the input voltage and control the conduction and shutdown of the upper and lower arm MOSFETs of the corresponding phases, thereby realizing the rectification action of the MOSFETs. The control units are powered by the rectified voltage and do not require an external power supply.

[0034] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A three-phase rectifier circuit using MOSFETs, characterized in that, The system includes a three-phase AC power supply, MOSFETs Q1, Q2, Q3, Q4, Q5, and Q6, a first control unit, a second control unit, and a third control unit. The three-phase AC power supply includes phases U, V, and W. The source of MOSFET Q1 and the drain of MOSFET Q2 are connected to phase U. The source of MOSFET Q3 and the drain of MOSFET Q4 are connected to phase V. The source of MOSFET Q5 and the drain of MOSFET Q6 are connected to phase W. The first control unit is connected to the gate of MOSFET Q1, the gate of MOSFET Q2, the drain of MOSFET Q1, and the source of MOSFET Q6. The U, V, and W phases are connected; the second control unit is connected to the gate of MOSFET Q3, the gate of MOSFET Q4, the drain of MOSFET Q3, the source of MOSFET Q4, the U, V, and W phases respectively; the third control unit is connected to the gate of MOSFET Q5, the gate of MOSFET Q6, the drain of MOSFET Q5, the source of MOSFET Q6, the U, V, and W phases respectively; the drain of MOSFET Q1 is connected to the drain of MOSFET Q3 and the drain of MOSFET Q5, and serves as the DC output VOUT terminal; the source of MOSFET Q2 is connected to the source of MOSFET Q4 and the source of MOSFET Q6, and serves as the DC output GND terminal.

2. The MOS transistor three-phase rectifier circuit according to claim 1, characterized in that, It also includes an output power indicator unit; the output power indicator unit includes a resistor R7 and a light-emitting diode; one end of the resistor R7 is connected to the DC output VOUT terminal, and the other end is connected to the anode of the light-emitting diode; the cathode of the light-emitting diode is connected to the DC output GND terminal.

3. The three-phase rectifier circuit with MOSFETs according to claim 1, characterized in that, It also includes capacitor C4; the positive terminal of capacitor C4 is connected to the DC output VOUT terminal, and the negative terminal of capacitor C4 is connected to the DC output GND terminal.

4. A three-phase rectifier circuit with MOSFETs according to claim 1, characterized in that, The first control unit includes a rectifier control chip IC1; pin 1 of the rectifier control chip IC1 is connected to phase V and phase W through a first input voltage sampling circuit; pin 3 of the rectifier control chip IC1 is electrically connected to the gate of MOSFET Q2; pin 5 of the rectifier control chip IC1 is electrically connected to the DC output GND terminal; pin 6 of the rectifier control chip IC1 is electrically connected to the DC output VOUT terminal; pins 5 and 6 of the rectifier control chip IC1 are electrically connected through capacitor C1; pin 7 of the rectifier control chip IC1 is electrically connected to the gate of MOSFET Q1; and pin 8 of the rectifier control chip IC1 is electrically connected to phase U.

5. A three-phase rectifier circuit with MOS transistors according to claim 4, characterized in that, The first input voltage sampling circuit includes diodes D1, D2, and D3, and resistors R1 and R2. Pin 1 of the rectifier control chip IC1 is electrically connected to one end of resistor R1, one end of resistor R2, the anode of diode D1, the anode of diode D2, and the cathode of diode D3, respectively. The other end of resistor R1 and the cathode of diode D1 are electrically connected to the V phase, the other end of resistor R2 and the cathode of diode D2 are electrically connected to the W phase, and the anode of diode D3 is electrically connected to the DC output GND terminal.

6. A three-phase rectifier circuit with MOSFETs according to claim 1, characterized in that, The second control unit includes a rectifier control chip IC2; pin 1 of the rectifier control chip IC2 is connected to phase U and phase W through a second input voltage sampling circuit; pin 3 of the rectifier control chip IC2 is electrically connected to the gate of MOSFET Q4; pin 5 of the rectifier control chip IC2 is electrically connected to the DC output GND terminal; pin 6 of the rectifier control chip IC2 is electrically connected to the DC output VOUT terminal; pins 5 and 6 of the rectifier control chip IC2 are electrically connected through capacitor C2; pin 7 of the rectifier control chip IC2 is electrically connected to the gate of MOSFET Q3; and pin 8 of the rectifier control chip IC2 is electrically connected to phase V.

7. A three-phase rectifier circuit with MOSFETs according to claim 6, characterized in that, The second input voltage sampling circuit includes diodes D4, D5, and D6, and resistors R3 and R4. Pin 1 of the rectifier control chip IC2 is electrically connected to one end of resistor R3, one end of resistor R4, the anode of diode D4, the anode of diode D5, and the cathode of diode D6, respectively. The other end of resistor R3 and the cathode of diode D4 are electrically connected to the U phase, the other end of resistor R4 and the cathode of diode D5 are electrically connected to the W phase, and the anode of diode D6 is electrically connected to the DC output GND terminal.

8. A three-phase rectifier circuit with MOSFETs according to claim 1, characterized in that, The third control unit includes a rectifier control chip IC3; pin 1 of the rectifier control chip IC3 is connected to phase U and phase V through a third input voltage sampling circuit; pin 3 of the rectifier control chip IC3 is electrically connected to the gate of MOSFET Q6; pin 5 of the rectifier control chip IC3 is electrically connected to the DC output GND terminal; pin 6 of the rectifier control chip IC3 is electrically connected to the DC output VOUT terminal; pins 5 and 6 of the rectifier control chip IC3 are connected through capacitor C3; pin 7 of the rectifier control chip IC3 is electrically connected to the gate of MOSFET Q5; and pin 8 of the rectifier control chip IC3 is electrically connected to phase W.

9. A three-phase rectifier circuit with MOS transistors according to claim 6, characterized in that, The third input voltage sampling circuit includes diodes D7, D8, and D9, resistors R5 and R6. Pin 1 of the rectifier control chip IC3 is electrically connected to one end of resistor R5, one end of resistor R6, the anode of diode D7, the anode of diode D8, and the cathode of diode D9, respectively. The other end of resistor R5 and the cathode of diode D7 are electrically connected to the U phase, the other end of resistor R6 and the cathode of diode D8 are electrically connected to the V phase, and the anode of diode D9 is electrically connected to the DC output GND terminal.

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