A wide voltage input motor drive circuit

Abstract

The utility model discloses a kind of motor drive circuits of wide voltage input belongs to motor drive technical field;The output end of power input rectification module is electrically connected with the input end of PFC boost module, the output end of PFC boost module is equipped with capacitor, to form regulated voltage direct current port VM at capacitor;The input end of step-down module is electrically connected with regulated voltage direct current port VM, the output end of step-down module is respectively electrically connected with the power input end VDD of MCU and the power input end VCC of phase full-bridge intelligent power module;The control signal input end of the intelligent power control output end of MCU is electrically connected with the three-phase full-bridge intelligent power module, the motor drive signal input end P of the three-phase full-bridge intelligent power module is electrically connected with regulated voltage direct current port VM, the motor drive signal output end of the three-phase full-bridge intelligent power module is electrically connected with motor.The motor drive circuit of wide voltage input has solved the problem that current fan is difficult to adapt to different voltage of different regions.

Description

Technical Field

[0001] This utility model relates to the field of motor drive technology, and in particular to a motor drive circuit with wide voltage input. Background Technology

[0002] Currently, motor-driven fans typically have a specified input voltage range, such as around 220V. The principle is to rectify the 220V voltage using a rectifier module, filter it into DC voltage through a capacitor, and finally output it to the motor after inversion. While this circuit is simple and convenient, the amplitude of the filtered DC voltage varies with changes in the AC voltage. When the AC voltage changes too much, it affects the stability of the motor's operation. To avoid severely impacting motor operation, the input AC voltage must be limited to a specified range, such as 220V in my country. However, in areas that do not use 220V AC, such as areas using 110V, this type of fan cannot be used stably. This reduces the fan's versatility. Utility Model Content

[0003] In order to overcome the defects of the existing technology, this utility model provides a motor drive circuit with wide voltage input to solve the above problems.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a wide voltage input motor drive circuit, including a power input rectifier module, a PFC boost module, a capacitor EC1, a buck module, an MCU and a three-phase full-bridge intelligent power module U2; The output terminal of the power input rectifier module is electrically connected to the input terminal of the PFC boost module. The output terminal of the PFC boost module is provided with the capacitor EC1 to form a regulated DC port VM in the capacitor EC1. The input terminal of the step-down module is electrically connected to the regulated DC port VM, and the output terminal of the step-down module is electrically connected to the power input terminal VDD of the MCU and the power input terminal VCC of the full-bridge intelligent power module U2, respectively. The intelligent power control output terminal of the MCU is electrically connected to the control signal input terminal of the three-phase full-bridge intelligent power module U2. The motor drive signal input terminal P of the three-phase full-bridge intelligent power module U2 is electrically connected to the regulated DC port VM. The motor drive signal output terminal of the three-phase full-bridge intelligent power module U2 is electrically connected to the motor.

[0005] Preferably, the PFC boost module includes a field-effect transistor Q1, an inductor L1, a diode D1, a diode D2, and a PFC controller IC2; The gate (G) of the field-effect transistor Q1 is electrically connected to the gate control terminal GATE of the PFC controller IC2. The source (S) of the field-effect transistor Q1 is grounded. The drain (D) of the field-effect transistor Q1 is electrically connected to the first terminal of the inductor L1 and the anode of the diode D2. The second terminal of the inductor L1 is electrically connected to the anode of the output diode D1 of the power input rectifier module. The cathodes of both diode D1 and diode D2 are electrically connected to the first terminal of the capacitor EC1. The second terminal of the capacitor EC1 is grounded.

[0006] Optionally, the step-down module includes a step-down constant voltage drive unit IC1 and a voltage regulator. The input terminal DRAIN of the step-down constant voltage drive unit IC1 is electrically connected to the regulated DC port VM. The output terminal OUT of the step-down constant voltage drive unit IC1 is electrically connected to the input terminal VIN of the voltage regulator. The output terminal VOUT of the voltage regulator is electrically connected to the power input terminal VDD of the MCU and the power input terminal VCC of the full-bridge intelligent power module U2.

[0007] Specifically, the intelligent power control output terminals of the MCU include a first control output terminal UP, a second control output terminal UN, a third control output terminal VP, a fourth control output terminal VN, a fifth control output terminal WP, and a sixth control output terminal WN. The control signal input terminals of the three-phase full-bridge intelligent power module U2 include a U-phase upper bridge PWM input terminal, a U-phase lower bridge PWM input terminal, a V-phase upper bridge PWM input terminal, a V-phase lower bridge PWM input terminal, a W-phase upper bridge PWM input terminal, and a W-phase lower bridge PWM input terminal. The first control output terminal UP is electrically connected to the upper bridge PWM input terminal of the U phase, the second control output terminal UN is electrically connected to the lower bridge PWM input terminal of the U phase, the third control output terminal VP is electrically connected to the upper bridge PWM input terminal of the V phase, the fourth control output terminal VN is electrically connected to the lower bridge PWM input terminal of the V phase, the fifth control output terminal WP is electrically connected to the upper bridge PWM input terminal of the W phase, and the sixth control output terminal WN is electrically connected to the lower bridge PWM input terminal of the W phase.

[0008] It is worth noting that the motor drive signal output terminal of the three-phase full-bridge intelligent power module U2 includes a U-phase AC output terminal, a V-phase AC output terminal and a W-phase AC output terminal. The U-phase AC output terminal is electrically connected to the U-phase input terminal of the motor, the V-phase AC output terminal is electrically connected to the V-phase of the motor, and the W-phase AC output terminal is electrically connected to the W-phase of the motor.

[0009] Preferably, the power input rectifier module includes a rectifier bridge BG1, the input terminal of which is electrically connected to the mains power, and the output terminal of which serves as the output terminal of the power input rectifier module and is electrically connected to the input terminal of the PFC boost module.

[0010] The beneficial effects of this invention are as follows: In the wide-voltage input motor drive circuit, by setting a PFC boost module between the power input rectifier module and capacitor EC1, AC voltage ranging from 90 to 260V can be rectified into DC voltage by the power input rectifier module, and then boosted by the PFC boost module to stabilize the voltage of the regulated DC port VM at 380V, thus achieving the purpose of wide voltage input. Then, the 380V voltage is stepped down by the buck module to power the MCU and the three-phase full-bridge intelligent power module U2, enabling them to operate normally. When the MCU and the three-phase full-bridge intelligent power module U2 are operating normally, the 380V voltage from the regulated DC port VM is input to the three-phase full-bridge intelligent power module U2. The MCU can invert the 380V voltage input through the three-phase full-bridge intelligent power module U2 to control the motor. In this way, the fan can be used in areas with AC voltage ranging from 90 to 260V, thereby increasing the fan's versatility. Attached Figure Description

[0011] Figure 1 This is a circuit diagram of the power input rectifier module and the PFC boost module in one embodiment of the present invention; Figure 2 This is a circuit diagram of the step-down module in one embodiment of the present invention; Figure 3 This is a circuit diagram of the MCU in one embodiment of the present invention; Figure 4 This is a circuit diagram of a three-phase full-bridge intelligent power module in one embodiment of the present invention. Detailed Implementation

[0012] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0013] like Figure 1-4 As shown, a wide voltage input motor drive circuit includes a power input rectifier module, a PFC boost module, a capacitor EC1, a buck module, an MCU, and a three-phase full-bridge intelligent power module U2; The output terminal of the power input rectifier module is electrically connected to the input terminal of the PFC boost module. The output terminal of the PFC boost module is provided with the capacitor EC1 to form a regulated DC port VM in the capacitor EC1. The input terminal of the step-down module is electrically connected to the regulated DC port VM, and the output terminal of the step-down module is electrically connected to the power input terminal VDD of the MCU and the power input terminal VCC of the full-bridge intelligent power module U2, respectively. The intelligent power control output terminal of the MCU is electrically connected to the control signal input terminal of the three-phase full-bridge intelligent power module U2. The motor drive signal input terminal P of the three-phase full-bridge intelligent power module U2 is electrically connected to the regulated DC port VM. The motor drive signal output terminal of the three-phase full-bridge intelligent power module U2 is electrically connected to the motor.

[0014] In the wide-voltage input motor drive circuit, a PFC boost module is installed between the power input rectifier module and capacitor EC1. This allows AC voltages ranging from 90 to 260V to be rectified into DC voltage by the power input rectifier module, and then boosted by the PFC boost module to stabilize the voltage at the regulated DC port VM at 380V, thus achieving the goal of wide voltage input. The 380V voltage is then stepped down by a buck module to power the MCU and the three-phase full-bridge intelligent power module U2, enabling them to operate normally. When the MCU and the three-phase full-bridge intelligent power module U2 are operating normally, the 380V voltage from the regulated DC port VM is input to the three-phase full-bridge intelligent power module U2. The MCU can invert the 380V input voltage through the three-phase full-bridge intelligent power module U2 to control the motor. In this way, the fan can be used in areas with AC voltages of 90 to 260V, thereby increasing the fan's versatility.

[0015] It is worth noting that, such as Figure 1 As shown, the PFC boost module includes a field-effect transistor Q1, an inductor L1, a diode D1, a diode D2, and a PFC controller IC2; The gate (G) of the field-effect transistor Q1 is electrically connected to the gate control terminal GATE of the PFC controller IC2. The source (S) of the field-effect transistor Q1 is grounded. The drain (D) of the field-effect transistor Q1 is electrically connected to the first terminal of the inductor L1 and the anode of the diode D2. The second terminal of the inductor L1 is electrically connected to the anode of the output diode D1 of the power input rectifier module. The cathodes of both diode D1 and diode D2 are electrically connected to the first terminal of the capacitor EC1. The second terminal of the capacitor EC1 is grounded, thereby forming a regulated DC port VM at the first terminal of the capacitor EC1.

[0016] In this embodiment, the field-effect transistor Q1 is first turned on, allowing the inductor L1 to store energy. Then, the field-effect transistor Q1 is turned off, at which point the inductor L1 releases energy to the capacitor EC1, raising the DC voltage across the capacitor EC1. Diodes D1 and D2 prevent the DC voltage across the capacitor EC1 from discharging further. The feedback signal input terminal FEEDBACK of the PFC controller IC2 is electrically connected to the first terminal of the capacitor EC1, thereby obtaining the feedback signal of the DC voltage of the capacitor EC1. Based on the feedback signal, the gate control terminal GATE controls the on and off states of the field-effect transistor Q1, stabilizing the DC voltage across the capacitor EC1 at a fixed value, such as 380V, and ensuring that it does not change with variations in the AC voltage input to the power input rectifier module, thus adapting to different input voltages.

[0017] Preferred, such as Figure 2 As shown, the step-down module includes a step-down constant voltage drive unit IC1 and a voltage regulator. The input terminal DRAIN of the step-down constant voltage drive unit IC1 is electrically connected to the regulated DC port VM. The output terminal OUT of the step-down constant voltage drive unit IC1 is electrically connected to the input terminal VIN of the voltage regulator. The output terminal VOUT of the voltage regulator is electrically connected to the power input terminal VDD of the MCU and the power input terminal VCC of the full-bridge intelligent power module U2.

[0018] In this embodiment, the buck constant voltage drive unit IC1 is model LKS620, and the voltage regulator is model LP3993-50X3F. The buck constant voltage drive unit IC1 reduces the 380V voltage of the regulated DC port VM to 15V, and then the voltage regulator reduces the 15V voltage to 15V to power the MCU and the full-bridge intelligent power module U2.

[0019] Optional, such as Figure 3 and 4 As shown, the intelligent power control output terminals of the MCU include a first control output terminal UP, a second control output terminal UN, a third control output terminal VP, a fourth control output terminal VN, a fifth control output terminal WP, and a sixth control output terminal WN. The control signal input terminals of the three-phase full-bridge intelligent power module U2 include a U-phase upper bridge PWM input terminal, a U-phase lower bridge PWM input terminal, a V-phase upper bridge PWM input terminal, a V-phase lower bridge PWM input terminal, a W-phase upper bridge PWM input terminal, and a W-phase lower bridge PWM input terminal. The first control output terminal UP is electrically connected to the upper bridge PWM input terminal of the U phase, the second control output terminal UN is electrically connected to the lower bridge PWM input terminal of the U phase, the third control output terminal VP is electrically connected to the upper bridge PWM input terminal of the V phase, the fourth control output terminal VN is electrically connected to the lower bridge PWM input terminal of the V phase, the fifth control output terminal WP is electrically connected to the upper bridge PWM input terminal of the W phase, and the sixth control output terminal WN is electrically connected to the lower bridge PWM input terminal of the W phase.

[0020] The first control output terminal UP is used to control the U-phase upper bridge arm built into the three-phase full-bridge intelligent power module U2 by issuing a PWM signal. The second control output terminal UN is used to control the U-phase lower bridge arm built into the three-phase full-bridge intelligent power module U2 by issuing a PWM signal. The third control output terminal VP is used to control the V-phase upper bridge arm built into the three-phase full-bridge intelligent power module U2 by issuing a PWM signal. The fourth control output terminal VN is used to control the V-phase lower bridge arm built into the three-phase full-bridge intelligent power module U2 by issuing a PWM signal. The fifth control output terminal WP is used to control the W-phase upper bridge arm built into the three-phase full-bridge intelligent power module U2 by issuing a PWM signal. The sixth control output terminal WN is used to control the W-phase lower bridge arm built into the three-phase full-bridge intelligent power module U2 by issuing a PWM signal.

[0021] Specifically, such as Figure 4 As shown, the motor drive signal output terminal of the three-phase full-bridge intelligent power module U2 includes a U-phase AC output terminal, a V-phase AC output terminal and a W-phase AC output terminal. The U-phase AC output terminal is electrically connected to the U-phase input terminal of the motor, the V-phase AC output terminal is electrically connected to the V-phase of the motor, and the W-phase AC output terminal is electrically connected to the W-phase of the motor.

[0022] The three-phase full-bridge intelligent power module takes the 380V voltage input to its motor drive signal input terminal P, and inverts it according to the PWM signal sent by the MCU to form a three-phase output of U, V and W to drive the motor.

[0023] Optional, such as Figure 1 As shown, the power input rectifier module includes a rectifier bridge BG1. The input terminal of the rectifier bridge BG1 is electrically connected to the mains power, and the output terminal of the rectifier bridge BG1 is electrically connected to the input terminal of the PFC boost module as the output terminal of the power input rectifier module.

[0024] The function of rectifier bridge BG1 is to rectify the 90~260V AC mains power into DC power, and then input it into the PFC boost module for voltage boosting and regulation.

[0025] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A motor drive circuit with wide voltage input, characterized in that: It includes a power input rectifier module, a PFC boost module, capacitor EC1, a buck module, an MCU, and a three-phase full-bridge intelligent power module U2; The output terminal of the power input rectifier module is electrically connected to the input terminal of the PFC boost module. The output terminal of the PFC boost module is provided with the capacitor EC1 to form a regulated DC port VM in the capacitor EC1. The input terminal of the step-down module is electrically connected to the regulated DC port VM, and the output terminal of the step-down module is electrically connected to the power input terminal VDD of the MCU and the power input terminal VCC of the full-bridge intelligent power module U2, respectively. The intelligent power control output terminal of the MCU is electrically connected to the control signal input terminal of the three-phase full-bridge intelligent power module U2. The motor drive signal input terminal P of the three-phase full-bridge intelligent power module U2 is electrically connected to the regulated DC port VM. The motor drive signal output terminal of the three-phase full-bridge intelligent power module U2 is electrically connected to the motor.

2. The wide voltage input motor drive circuit according to claim 1, characterized in that: The PFC boost module includes a field-effect transistor Q1, an inductor L1, a diode D1, a diode D2, and a PFC controller IC2; The gate (G) of the field-effect transistor Q1 is electrically connected to the gate control terminal GATE of the PFC controller IC2. The source (S) of the field-effect transistor Q1 is grounded. The drain (D) of the field-effect transistor Q1 is electrically connected to the first terminal of the inductor L1 and the anode of the diode D2. The second terminal of the inductor L1 is electrically connected to the anode of the output diode D1 of the power input rectifier module. The cathodes of both diode D1 and diode D2 are electrically connected to the first terminal of the capacitor EC1. The second terminal of the capacitor EC1 is grounded.

3. The wide voltage input motor drive circuit according to claim 1, characterized in that: The step-down module includes a step-down constant voltage drive unit IC1 and a voltage regulator. The input terminal DRAIN of the step-down constant voltage drive unit IC1 is electrically connected to the regulated DC port VM. The output terminal OUT of the step-down constant voltage drive unit IC1 is electrically connected to the input terminal VIN of the voltage regulator. The output terminal VOUT of the voltage regulator is electrically connected to the power input terminal VDD of the MCU and the power input terminal VCC of the full-bridge intelligent power module U2.

4. The wide voltage input motor drive circuit according to claim 1, characterized in that: The intelligent power control output terminals of the MCU include a first control output terminal UP, a second control output terminal UN, a third control output terminal VP, a fourth control output terminal VN, a fifth control output terminal WP, and a sixth control output terminal WN. The control signal input terminals of the three-phase full-bridge intelligent power module U2 include a U-phase upper bridge PWM input terminal, a U-phase lower bridge PWM input terminal, a V-phase upper bridge PWM input terminal, a V-phase lower bridge PWM input terminal, a W-phase upper bridge PWM input terminal, and a W-phase lower bridge PWM input terminal. The first control output terminal UP is electrically connected to the upper bridge PWM input terminal of the U phase, the second control output terminal UN is electrically connected to the lower bridge PWM input terminal of the U phase, the third control output terminal VP is electrically connected to the upper bridge PWM input terminal of the V phase, the fourth control output terminal VN is electrically connected to the lower bridge PWM input terminal of the V phase, the fifth control output terminal WP is electrically connected to the upper bridge PWM input terminal of the W phase, and the sixth control output terminal WN is electrically connected to the lower bridge PWM input terminal of the W phase.

5. The wide voltage input motor drive circuit according to claim 1, characterized in that: The motor drive signal output terminal of the three-phase full-bridge intelligent power module U2 includes a U-phase AC output terminal, a V-phase AC output terminal, and a W-phase AC output terminal. The U-phase AC output terminal is electrically connected to the U-phase input terminal of the motor, the V-phase AC output terminal is electrically connected to the V-phase of the motor, and the W-phase AC output terminal is electrically connected to the W-phase of the motor.

6. The wide voltage input motor drive circuit according to claim 1, characterized in that: The power input rectifier module includes a rectifier bridge BG1. The input terminal of the rectifier bridge BG1 is electrically connected to the mains power, and the output terminal of the rectifier bridge BG1 is electrically connected to the input terminal of the PFC boost module as the output terminal of the power input rectifier module.

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