Driving circuit with open-phase detection function

Abstract

The utility model relates to the technical field of three-phase motor drive circuits, in particular to a drive circuit with an open-phase detection function. One end of a control signal module is connected with positive and negative electrodes of a direct-current power supply, and the other end is connected with an input pin of a gate drive circuit module; an output pin of the gate drive circuit module is connected to the isolation current limiting module and the current detection module; the output end of the optoelectronic isolator is connected with an MOS tube of the MOS tube driving module through a 10R resistor; the current detection module comprises two groups of LTC2063 chips, and the output end of each group of LTC2063 chips is connected with the two MOS tubes of the MOS tube driving module in parallel; the two groups of MOS tubes are connected in parallel to form an upper bridge arm; and the two groups of MOS tubes are connected in parallel to form an upper bridge arm. According to the utility model, the current detection module is added, and the double-MOS tube parallel circuit is used as the upper bridge arm and the lower bridge arm, so that the driving efficiency of the circuit is improved, and the reliability and the stability of the circuit are enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to three -phase motor drive circuit technical field, concretely relates to a drive circuit with open -phase detection function. BACKGROUND

[0002] Traditional three -phase motor drive circuit mainly relies on analog switch or MOS tube and IO signal combination, and many adopt single power transistor, difficult to adapt to the demand of large -current motor. Although there is Chinese patent CN221530971 U discloses a silicon controlled three -phase leakage protection device, improves reliability through diode half -wave rectification, but still has problems such as low electric energy conversion efficiency, large energy consumption, under long -time operation or complex working condition, circuit is easy to failure or performance decline, lack accurate current detection, influences performance and safety, and is not effectively electrically isolated, is easy to interfere or be interfered, influences stability and safety. SUMMARY

[0003] The utility model solves the technical problems that overcome prior art's insufficient, provide a drive circuit with open -phase detection function.

[0004] The utility model adopts the technical scheme as follows:

[0005] A drive circuit with open -phase detection function, including control signal module, gate drive circuit module, isolation current -limiting module, current detection module and MOS tube drive module that are sequentially connected, wherein:

[0006] Control signal module, one end is connected DC power supply positive and negative pole, the other end connects the input pin of gate drive circuit module;

[0007] Gate drive circuit module, including gate driver, for amplifying input signal to enough drive MOS tube drive module, its output pin is connected to isolation current -limiting module, current detection module respectively;

[0008] Isolation current -limiting module, including photoelectric isolator, photoelectric isolator's input end is connected to the output pin of gate driver, and photoelectric isolator's output end is connected to the MOS tube of MOS tube drive module through 10R resistance;

[0009] Current detection module, including two groups of LTC2063 chips, the input end of LTC2063 chip is connected to the output pin of gate driver, and the output end of each group of LTC2063 chip is connected to two MOS tubes of MOS tube drive module in parallel;

[0010] MOS tube drive module, including four groups of MOS tubes, two groups of MOS tubes are connected in parallel to constitute upper bridge arm, and two groups of MOS tubes are connected in parallel to constitute upper bridge arm.

[0011] The technical scheme improves the structure of the driving circuit, increases a current detection module, and realizes the MOS tube driving function and the phase loss detection function at the same time. Specifically, the entire driving circuit has the phase loss detection function, which is realized by monitoring whether the three-phase currents are balanced; if a phase current is lost or abnormal, the driving circuit can detect it and take corresponding protection measures, such as shutting down the output or issuing an alarm. The control signal module converts the weak or complex signals received into a level or wave that can be understood by the gate drive circuit, one end of which is connected to a direct current power supply to ensure power supply, and the other end is connected to the gate drive circuit module; the gate drive circuit module is used for amplifying the output signal of the control signal module to a level required for driving the MOS tube; the gate drive has high current gain and low output impedance, and can amplify the input small signal to a level sufficient to drive the gate of the MOS tube; the isolation current limiting module is used for providing electrical isolation, protecting the gate drive circuit from the influence of high voltage and large current of the power circuit, and limiting the current through the MOS tube through a current limiting resistor to prevent overcurrent damage; the opto-isolator transmits electrical signals using optical signals to achieve electrical isolation; the current limiting resistor ensures that the current does not exceed the safe range under normal working conditions; the current detection module monitors the current through the MOS tube to realize current control or protection of the motor or other loads; the LTC2063 chip can accurately measure the current through its input end and convert it into a voltage signal output; by being connected in parallel across the MOS tube, the current condition is monitored in real time, and the high precision and linearity of the current sensor are utilized, as well as the conversion relationship between current and voltage; the MOS tube driving module utilizes the MOS tube to realize efficient conversion and control of electric energy; by connecting two groups of MOS tubes in parallel to form upper and lower bridge arms, a three-phase inverter function is realized.

[0012] In addition, the driving circuit with the phase loss detection function according to the above-mentioned technical scheme of the utility model further has the following additional technical features:

[0013] According to an embodiment of the utility model, the upper bridge arm includes an upper bridge arm I and an upper bridge arm II; the lower bridge arm includes a lower bridge arm I and a lower bridge arm; wherein:

[0014] The upper bridge arm I and the upper bridge arm II are synchronously turned on or turned off, and the lower bridge arm I and the lower bridge arm are synchronously turned on or turned off.

[0015] At the same time, the upper bridge arm and the lower bridge arm cannot be in the turned-on state at the same time, so when the upper bridge arm is turned on, the lower bridge arm is in the turned-off state.

[0016] The technical scheme adjusts the synchronous turn-on or turn-off of the upper bridge arm and the lower bridge arm, ensures that the upper bridge arm and the lower bridge arm cannot be in the turned-on state at the same time, and maintains the stable operation of the driving circuit.

[0017] According to one embodiment of the present invention, the gate drive circuit module is connected to the three-phase currents U, V, and W respectively to the three-phase motor M.

[0018] This technical solution achieves the driving of a three-phase motor M by connecting the gate drive circuit module to the U, V, and W three-phase currents.

[0019] According to one embodiment of the present invention, the upper bridge arm and the lower bridge arm are respectively connected to the positive terminal VCC of a DC power supply.

[0020] This technical solution ensures normal power supply to the drive circuit by connecting the upper and lower bridge arms to the positive terminal VCC of the DC power supply, respectively.

[0021] According to one embodiment of the present invention, the current detection module detects the three-phase currents U, V, and W respectively.

[0022] This technical solution uses a current detection module to detect the three-phase currents U, V, and W respectively, thereby achieving the function of phase loss detection.

[0023] According to one embodiment of the present invention, both the upper bridge arm and the lower bridge arm adopt a dual MOS transistor parallel circuit, with the two sets of MOS transistors serving as backups for each other.

[0024] This technical solution improves the reliability and stability of the drive circuit by using a dual MOS transistor parallel circuit as the upper and lower bridge arms.

[0025] Compared with the prior art, this utility model has the following advantages:

[0026] By improving the structure of the drive circuit, adding a current detection module, and using a dual MOSFET parallel circuit as the upper and lower bridge arms, not only is the drive efficiency of the circuit improved, but the reliability and stability of the circuit are also enhanced. The use of a high-precision LTC2063 current sensor and opto-isolator ensures the high precision and electrical isolation of the circuit, thereby improving the performance of the drive circuit. Attached Figure Description

[0027] Figure 1 This is the electrical diagram of the single-phase drive circuit of this utility model.

[0028] Figure 2 This is the electrical diagram of the three-phase drive circuit of this utility model.

[0029] In the diagram: 1. Control signal module; 2. Gate drive circuit module; 3. Isolation current limiting module; 4. Current detection module; 5. MOSFET drive module; 51. Upper bridge arm I; 52. Upper bridge arm II; 53. Lower bridge arm I; 54. Lower bridge arm II. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, this embodiment provides a drive circuit with phase loss detection function, including a control signal module 1, a gate drive circuit module 2, an isolation current limiting module 3, a current detection module 4, and a MOSFET drive module 5 connected in sequence, wherein:

[0033] Control signal module 1, one end of which is connected to the positive and negative terminals of a DC power supply, and the other end is connected to the input pin of gate drive circuit module 2;

[0034] Gate drive circuit module 2 includes a gate driver for amplifying the input signal to a level sufficient to drive MOS transistor drive module 5, and its output pins are respectively connected to isolation current limiting module 3 and current detection module 4.

[0035] The isolation current limiting module 3 includes an opto-isolator. The input terminal of the opto-isolator is connected to the output pin of the gate driver, and the output terminal of the opto-isolator is connected to the MOS transistor of the MOS transistor driving module 5 through a 10R resistor.

[0036] The current detection module 4 includes two sets of LTC2063 chips. The input terminal of the LTC2063 chip is connected to the output pin of the gate driver. The output terminal of each set of LTC2063 chips is connected in parallel with the two MOS transistors of the MOS transistor driving module 5.

[0037] The MOSFET driver module 5 includes four sets of MOSFETs, with two sets of MOSFETs connected in parallel to form the upper bridge arm.

[0038] like Figure 1 and Figure 2As shown, this technical solution improves the structure of the drive circuit by adding a current detection module 4, achieving both MOSFET drive function and phase loss detection function. Specifically, the entire drive circuit has a phase loss detection function, which is achieved by monitoring whether the three-phase current is balanced; if a phase current is missing or abnormal, the drive circuit will be able to detect it and take corresponding protection measures, such as shutting down the output or issuing an alarm. The control signal module 1 converts the received weak or complex signals into a level or wave that the gate drive circuit can understand. One end is connected to a DC power supply to ensure power supply, and the other end is connected to the gate drive circuit module 2; the gate drive circuit module 2 is used to amplify the output signal of the control signal module 1 to reach the level required to drive the MOSFET; the gate driver has a high current gain and a low output impedance, which can amplify the small input signal to a level sufficient to drive the gate of the MOSFET; the isolation current limiting module 3 is used to provide electrical isolation, protecting the gate drive circuit from the high voltage and high current of the power circuit, and at the same time limiting the current through the MOSFET through the current limiting resistor to prevent overcurrent damage; opto-isolator Optical signals are used to transmit electrical signals, achieving electrical isolation; current-limiting resistors ensure that the current does not exceed the safe range under normal operating conditions; current detection module 4 monitors the current through the MOSFET to achieve current control or protection for motors or other loads; the LTC2063 chip can accurately measure the current through its input terminal and convert it into a voltage signal output; by being connected in parallel across the MOSFET, the current situation is monitored in real time, utilizing the high accuracy and linearity of the current sensor, as well as the conversion relationship between current and voltage; MOSFET drive module 5 uses the MOSFET to achieve efficient conversion and control of electrical energy; by connecting two sets of MOSFETs in parallel to form the upper and lower bridge arms, the three-phase inverter function is realized.

[0039] In addition, the drive circuit with phase loss detection function proposed above according to this utility model also has the following additional technical features:

[0040] According to one embodiment of the present invention, the upper bridge arm includes upper bridge arm I 51 and upper bridge arm II 52; the lower bridge arm includes lower bridge arm I 53 and lower bridge arm II, wherein:

[0041] Upper bridge arm I 51 and upper bridge arm II 52 are opened or closed simultaneously; lower bridge arm I 53 and lower bridge arm are opened or closed simultaneously.

[0042] At the same time, the upper and lower bridge arms cannot be in the open state at the same time. Therefore, when the upper bridge arm is in the open state, the lower bridge arm is in the closed state.

[0043] This technical solution ensures that the upper and lower bridge arms cannot be in the on state at the same time by adjusting the synchronous opening or closing of the upper and lower bridge arms, thereby maintaining the stable operation of the drive circuit.

[0044] According to one embodiment of the present invention, the gate drive circuit module 2 is connected to the three-phase currents U, V, and W respectively to the three-phase motor M.

[0045] This technical solution achieves the driving of a three-phase motor M by connecting the gate drive circuit module 2 to the U, V, and W three-phase currents.

[0046] According to one embodiment of the present invention, the upper bridge arm and the lower bridge arm are respectively connected to the positive terminal VCC of a DC power supply.

[0047] This technical solution ensures normal power supply to the drive circuit by connecting the upper and lower bridge arms to the positive terminal VCC of the DC power supply, respectively.

[0048] According to one embodiment of the present invention, the current detection module 4 detects the three-phase currents U, V, and W respectively.

[0049] This technical solution uses the current detection module 4 to detect the three-phase currents U, V, and W respectively, thereby realizing the phase loss detection function.

[0050] According to one embodiment of the present invention, both the upper bridge arm and the lower bridge arm adopt a dual MOS transistor parallel circuit, with the two sets of MOS transistors serving as backups for each other.

[0051] This technical solution improves the reliability and stability of the drive circuit by using a dual MOS transistor parallel circuit as the upper and lower bridge arms.

[0052] The usage process of the above embodiments is as follows:

[0053] like Figure 1 and Figure 2As shown, control signal module 1 receives external signals and converts them into levels or waveforms that the gate drive circuit can understand, while ensuring normal power supply. Gate drive circuit module 2 receives these signals and amplifies them through the gate driver to achieve the required level for driving the MOSFET. The amplified signal is sent to isolation current limiting module 3, where an opto-isolator provides electrical isolation, protecting the gate drive circuit from high voltage and high current. A current limiting resistor limits the current through the MOSFET to prevent overcurrent damage. Current detection module 4 uses an LTC2063 chip to accurately measure the current through the MOSFET and converts it into a voltage signal output. By connecting it in parallel across the MOSFET, the current is monitored in real time, achieving current control. For protection purposes, the MOSFET drive module 5 utilizes four sets of MOSFETs to achieve efficient power conversion and control. Two sets form the upper bridge arm, and two sets form the lower bridge arm, and the upper and lower bridge arms cannot be turned on simultaneously. By adjusting the synchronous turning on or off of the upper and lower bridge arms, the stable operation of the drive circuit is maintained. The drive circuit also has a phase loss detection function. The current detection module 4 detects the U, V, and W phase currents respectively. If a phase current is missing or abnormal, the drive circuit will detect it and take corresponding protection measures, such as shutting down the output or issuing an alarm. By using a dual MOSFET parallel circuit as the upper and lower bridge arms, the reliability of the drive circuit is improved. The entire drive circuit has a compact structure and comprehensive functions, and is suitable for driving and controlling loads such as three-phase motors.

[0054] This utility model only improves the structure of the drive circuit and does not improve the control method; therefore, it is protected by utility model.

[0055] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A drive circuit with phase loss detection function, characterized in that, It includes a control signal module (1), a gate drive circuit module (2), an isolation current limiting module (3), a current detection module (4), and a MOSFET drive module (5) connected in sequence, wherein: The control signal module (1) has one end connected to the positive and negative terminals of the DC power supply and the other end connected to the input pin of the gate drive circuit module (2). The gate drive circuit module (2) includes a gate driver for amplifying the input signal to a level sufficient to drive the MOS transistor drive module (5), and its output pins are connected to the isolation current limiting module (3) and the current detection module (4), respectively. The isolation current limiting module (3) includes an opto-isolator. The input terminal of the opto-isolator is connected to the output pin of the gate driver, and the output terminal of the opto-isolator is connected to the MOS transistor of the MOS transistor driving module (5) through a 10R resistor. The current detection module (4) includes two sets of LTC2063 chips. The input terminal of the LTC2063 chip is connected to the output pin of the gate driver. The output terminal of each set of LTC2063 chips is connected in parallel with the two MOS transistors of the MOS transistor driving module (5). The MOS transistor drive module (5) includes four sets of MOS transistors, with two sets of MOS transistors connected in parallel to form the upper bridge arm.

2. The driving circuit with phase loss detection function as described in claim 1, characterized in that, The upper bridge arm includes upper bridge arm I (51) and upper bridge arm II (52); the lower bridge arm includes lower bridge arm I (53) and lower bridge arm II, wherein: Upper bridge arm I (51) and upper bridge arm II (52) are opened or closed simultaneously; lower bridge arm I (53) and lower bridge arm are opened or closed simultaneously. At the same time, the upper and lower bridge arms cannot be in the open state at the same time. Therefore, when the upper bridge arm is in the open state, the lower bridge arm is in the closed state.

3. The drive circuit with phase loss detection function as described in claim 1, characterized in that, The gate drive circuit module (2) connects the three-phase currents U, V, and W to the three-phase motor M respectively.

4. The driving circuit with phase loss detection function as described in claim 2, characterized in that, The upper and lower bridge arms are respectively connected to the positive terminal VCC of the DC power supply.

5. The drive circuit with phase loss detection function as described in claim 1, characterized in that, The current detection module (4) detects the three-phase currents U, V, and W respectively.

6. The drive circuit with phase loss detection function as described in claim 4, characterized in that, Both the upper and lower bridge arms adopt a dual MOS transistor parallel circuit, with the two sets of MOS transistors serving as backups for each other.

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