Bootstrap charging low-power-consumption circuit and motor driving device

Abstract

The utility model discloses a bootstrap charging low power consumption circuit and a motor driving device, comprising a driving module, a control module, a driving power supply module and a bootstrap charging module, the output end of the driving module is used for being connected with a load, and the control module is connected with the controlled end of the driving module. The output end of the driving power supply module is connected with the driving module to supply power to the driving module, the head end of the bootstrap charging module is connected with the driving module and the output end of the driving power supply module, the tail end of the bootstrap charging module is connected with the output end of the driving module, and the driving power supply module comprises a power supply switch module and a power supply modulation module. The power supply switch module and the power supply modulation module are connected to form at least part of power supply control branches, the output ends of the power supply control branches are connected with the driving module, the control module is connected with the controlled end of the power supply switch module to control on-off of the power supply switch module, and the design reduces shutdown power consumption and meets energy-saving and power-saving requirements.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a bootstrap charging low-power circuit and a motor drive device. Background Technology

[0002] Existing drive circuits typically include a control module and a drive module. The drive module and the load are connected to form a drive branch, which is powered by a power supply. The control module is connected to the controlled end of the drive module, and the drive power supply module is connected to the power supply. It then modulates a suitable voltage to ensure the operation of the drive module. The control module can control the on / off state of the drive module to drive the load. In order to improve the driving capability when the drive module is turned on, a bootstrap capacitor connected in parallel with the drive module can also be set in the drive circuit. The drive power supply module charges the bootstrap capacitor to ensure the voltage of the controlled end of the drive module, making the drive module turn on more quickly. However, after the load stops, the drive power supply module will still discharge the bootstrap capacitor, resulting in slow power consumption, which does not meet the requirements of energy saving. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a bootstrap charging low-power circuit and a motor drive device to reduce power consumption during shutdown and meet energy-saving requirements.

[0004] A bootstrap charging low-power circuit according to a first aspect of the present invention includes: a driving module, the output terminal of which is connected to a load to form at least a partial driving branch, the driving branch being connected to a power supply; a control module connected to a controlled terminal of the driving module to control the on / off state of the driving module; a driving power supply module, the input terminal of which is connected to the power supply, and the output terminal of which is connected to the driving module to supply power to the driving module; and a bootstrap charging module, the first end of which is connected to both the driving module and the output terminal of the driving power supply module, and the tail end of which is connected to the output terminal of the driving module; wherein the driving power supply module includes a power supply switch module and a power supply modulation module, the power supply switch module and the power supply modulation module being connected to form at least a partial power supply control branch, the input terminal of which is connected to the power supply, the output terminal of which is connected to the driving module, and the control module being connected to a controlled terminal of the power supply switch module to control the on / off state of the power supply switch module.

[0005] A bootstrap charging low-power circuit according to an embodiment of the present invention has at least the following beneficial effects:

[0006] This invention relates to a bootstrap charging low-power circuit. During the load driving process, the control module controls the power supply switch module to turn on, and the power supply modulation module modulates a suitable voltage to power the drive module and charge the bootstrap charging module. The control module controls the drive module to turn on and off, thereby driving the load to run. The bootstrap charging module provides a stable voltage for the drive module to turn on, ensuring the turn-on efficiency of the drive module. During the load shutdown process, the control module controls the power supply switch module to turn off, and the power supply modulation module no longer supplies power to the drive module and the bootstrap charging module, thus avoiding additional power consumption. This design reduces shutdown power consumption and meets the requirements for energy saving.

[0007] According to some embodiments of the present invention, the bootstrap charging module includes a capacitor C3, the first end of which is connected to the output end of the driving module and the driving power supply module, and the tail end of which is connected to the output end of the driving module.

[0008] According to some embodiments of this utility model, there are three driving modules, namely a first driving module, a second driving module, and a third driving module. The bootstrap charging module further includes capacitors C4 and C5. The first end of capacitor C3 is connected to the output terminals of the first driving module and the driving power supply module, and the last end of capacitor C3 is connected to the output terminal of the first driving module. The first end of capacitor C4 is connected to the output terminals of the second driving module and the driving power supply module, and the last end of capacitor C4 is connected to the output terminal of the second driving module. The first end of capacitor C5 is connected to the output terminals of the third driving module and the driving power supply module, and the last end of capacitor C5 is connected to the output terminal of the third driving module.

[0009] According to some embodiments of the present invention, the power supply modulation module includes a voltage regulating unit and a diode D1. The input terminal of the voltage regulating unit is connected to the power supply switch module, the output terminal of the voltage regulating unit is connected to the positive terminal of the diode D1, and the negative terminal of the diode D1 is connected to the first end of the bootstrap charging module and the driving module, respectively.

[0010] According to some embodiments of the present invention, the power supply modulation module further includes a resistor R5 and a capacitor C1. The output terminal of the voltage regulation unit is connected to the first end of the capacitor C1 and the first end of the resistor R5, respectively. The tail end of the resistor R5 is connected to the positive terminal of the diode D1, and the tail end of the capacitor C1 is grounded.

[0011] According to some embodiments of the present invention, the power supply switch module includes a semiconductor switch Q1 and a semiconductor switch Q2. The input terminal of the switch Q1 is connected to the power supply, the output terminal of the switch Q1 is connected to the input terminal of the voltage regulation unit, the input terminal of the switch Q2 is connected to the controlled terminal of the switch Q1, the output terminal of the switch Q2 is grounded, and the control module is connected to the controlled terminal of the switch Q2.

[0012] According to some embodiments of this utility model, the switching transistor Q1 is a transistor, a MOSFET, or a thyristor.

[0013] According to some embodiments of this utility model, the switching transistor Q2 is a transistor, a MOSFET, or a thyristor.

[0014] According to a second aspect of the present invention, the motor drive device includes the bootstrap charging low-power circuit disclosed in any of the above embodiments, and the output terminal of the drive module is connected to the motor to form a drive branch.

[0015] The motor drive device according to the embodiments of the present utility model has at least the following beneficial effects:

[0016] The motor drive device of this utility model applies the bootstrap charging low-power circuit disclosed in any of the above embodiments to reduce shutdown power consumption and meet the energy saving requirements.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic block diagram of one embodiment of the bootstrap charging low-power circuit of this utility model.

[0020] Figure 2 A circuit diagram of one embodiment of the bootstrap charging module of the bootstrap charging low-power circuit of this utility model;

[0021] Figure 3 This is a circuit diagram of one embodiment of the drive power supply module for the bootstrap charging low-power circuit of this utility model.

[0022] Figure label:

[0023] Drive module 100; control module 200; drive power supply module 300; power supply switch module 310; power supply modulation module 320; voltage regulation unit 321; bootstrap charging module 400. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figures 1 to 3As shown, a bootstrap charging low-power circuit according to a first aspect embodiment of the present invention includes a drive module 100, a control module 200, a drive power supply module 300, and a bootstrap charging module 400. The output terminal of the drive module 100 is connected to a load to form at least a partial drive branch, and the drive branch is connected to a power supply. The control module 200 is connected to the controlled terminal of the drive module 100 to control the on / off state of the drive module 100. The input terminal of the drive power supply module 300 is connected to the power supply, and the output terminal of the drive power supply module 300 is connected to the drive module 100 to supply power to the drive module 100. The bootstrap charging module 400... The first end of the self-boot charging module 400 is connected to the output end of the drive module 100 and the drive power supply module 300, respectively. The tail end of the self-boot charging module 400 is connected to the output end of the drive module 100. The drive power supply module 300 includes a power supply switch module 310 and a power supply modulation module 320. The power supply switch module 310 and the power supply modulation module 320 are connected to form at least a partial power supply control branch. The input end of the power supply control branch is connected to the power supply, and the output end of the power supply control branch is connected to the drive module 100. The control module 200 is connected to the controlled end of the power supply switch module 310 to control the on / off state of the power supply switch module 310.

[0029] The control module 200 may include an MCU or CPU and its auxiliary circuits. The drive module 100 typically includes a semiconductor switch Q3 and a semiconductor switch Q4 (not shown in the figure). The switch Q4 and the load constitute at least part of the drive branch. The input terminal of the switch Q3 is connected to the controlled terminal of the switch Q4, the first terminal of the bootstrap charging module 400, and the output terminal of the drive power supply module 300, respectively. The output terminal of the switch Q3 is grounded. The control module 200 is connected to the controlled terminal of the switch Q3. The tail terminal of the bootstrap charging module 400 is connected to the output terminal of the switch Q4. Specifically, the switch Q3 and the switch Q4 may be transistors, MOSFETs, or thyristors, etc.

[0030] The load can be a three-phase motor. The self-bootstrapping charging low-power circuit can be applied to equipment such as range hoods and fans. If the load is a three-phase motor, there are three corresponding drive modules 100. Each drive module 100 drives the coil in the three-phase motor, that is, it is connected to the U, V and W ports of the three-phase motor.

[0031] The control module 200 and the drive module 100 can be integrated into the same chip, such as... Figure 2As shown, the output terminals of multiple drive modules 100 form the U, V, and W output ports of the integrated chip, which are connected to the U, V, and W ports of the three-phase motor. The controlled terminals of multiple switching transistors Q4 form the VBU, VBV, and VBW ports of the integrated chip, which are connected to the heads of each bootstrap charging module 400 respectively.

[0032] This invention relates to a bootstrap charging low-power circuit. During the load driving process, the control module 200 controls the power supply switch module 310 to turn on, and the power supply modulation module 320 modulates a suitable voltage power supply to power the drive module 100 and simultaneously charge the bootstrap charging module 400. The control module 200 controls the drive module 100 to turn on and off, thereby driving the load to run. The bootstrap charging module 400 provides a stable voltage for the drive module 100 to turn on, ensuring the turn-on efficiency of the drive module 100. During the load shutdown process, the control module 200 controls the power supply switch module 310 to turn off, and the power supply modulation module 320 no longer supplies power to the drive module 100 and the bootstrap charging module 400, thus avoiding additional power consumption. This design reduces shutdown power consumption and meets the requirements for energy saving.

[0033] In some embodiments of this utility model, the bootstrap charging module 400 includes a capacitor C3, the first end of which is connected to the output terminals of the driving module 100 and the driving power supply module 300, respectively, and the last end of which is connected to the output terminal of the driving module 100.

[0034] Specifically, the first end of capacitor C3 can be connected to the input terminal of switching transistor Q3, the controlled terminal of switching transistor Q4, and the output terminal of the drive power supply module 300. The last end of capacitor C3 is connected to the output terminal of switching transistor Q4.

[0035] In some embodiments of this utility model, such as Figure 2 As shown, there are three drive modules 100, namely a first drive module 100, a second drive module 100, and a third drive module 100. The bootstrap charging module 400 also includes capacitors C4 and C5. The first end of capacitor C3 is connected to the output terminals of the first drive module 100 and the drive power supply module 300, and the last end of capacitor C3 is connected to the output terminal of the first drive module 100. The first end of capacitor C4 is connected to the output terminals of the second drive module 100 and the drive power supply module 300, and the last end of capacitor C4 is connected to the output terminal of the second drive module 100. The first end of capacitor C5 is connected to the output terminals of the third drive module 100 and the drive power supply module 300, and the last end of capacitor C5 is connected to the output terminal of the third drive module 100.

[0036] Taking a three-phase motor as an example, the output of the first drive module 100 can be connected to the U port of the three-phase motor, the output of the second drive module 100 can be connected to the V port of the three-phase motor, and the output of the third drive module 100 can be connected to the W port of the three-phase motor.

[0037] In some embodiments of this utility model, such as Figure 2 , 3 As shown, the power supply modulation module 320 includes a voltage regulating unit 321 and a diode D1. The input terminal of the voltage regulating unit 321 is connected to the power supply switch module 310, the output terminal of the voltage regulating unit 321 is connected to the positive terminal of the diode D1, and the negative terminal of the diode D1 is connected to the first end of the bootstrap charging module 400 and the driving module 100, respectively.

[0038] The voltage regulating unit 321 can be selected from conventional voltage regulating chips and auxiliary circuits. The power supply can obtain a DC power supply voltage through a rectifier and voltage regulator circuit. The voltage regulating unit 321 charges the capacitor C3 through diode D1. For cases with multiple loads, the bootstrap charging module 400 also includes capacitors C4 and C5. The power supply voltage regulating module also includes diodes D2 and D3. The positive terminals of diodes D2 and D3 are connected to the output terminal of the voltage regulating unit 321. The negative terminal of diode D2 is connected to the first terminal of capacitor C4, and the negative terminal of diode D3 is connected to capacitor C5, thereby preventing current backflow and making the power supply stable and reliable.

[0039] In some embodiments of this utility model, the power supply modulation module 320 further includes a resistor R5 and a capacitor C1. The output terminal of the voltage regulation unit 321 is connected to the first end of the capacitor C1 and the first end of the resistor R5, respectively. The tail end of the resistor R5 is connected to the positive terminal of the diode D1, and the tail end of the capacitor C1 is grounded. The resistor R5 and the capacitor C1 filter the DC power supply voltage output by the voltage regulation unit 321, thereby ensuring a stable and reliable power supply.

[0040] In some embodiments of this utility model, the power supply switch module 310 includes a semiconductor switch Q1 and a semiconductor switch Q2. The input terminal of the switch Q1 is connected to the power supply, the output terminal of the switch Q1 is connected to the input terminal of the voltage regulating unit 321, the input terminal of the switch Q2 is connected to the controlled terminal of the switch Q1, the output terminal of the switch Q2 is grounded, and the control module 200 is connected to the controlled terminal of the switch Q2.

[0041] Specifically, the switching transistor Q1 is a transistor, a MOSFET, or a thyristor, and the switching transistor Q2 is a transistor, a MOSFET, or a thyristor.

[0042] by Figure 3For example, switch Q2 is an N-type transistor and switch Q1 is an N-channel MOSFET. When the control module 200 outputs a high-level signal, switch Q2 is turned on and switch Q1 is turned off. Conversely, when the control module 200 outputs a low-level signal, switch Q2 is turned off and switch Q1 is turned on.

[0043] According to a second aspect of the present invention, the motor drive device includes the bootstrap charging low-power circuit disclosed in any of the above embodiments, and the output terminal of the drive module 100 is connected to the motor to form a drive branch.

[0044] The motor drive device according to the embodiments of the present utility model has at least the following beneficial effects:

[0045] The motor drive device of this utility model applies the bootstrap charging low-power circuit disclosed in any of the above embodiments to reduce shutdown power consumption and meet the energy saving requirements.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A bootstrap charging low-power circuit, characterized in that, include: A drive module, wherein the output terminal of the drive module is used to connect with the load to form at least a partial drive branch, and the drive branch is used to connect with the power supply. A control module is connected to the controlled end of the drive module to control the on / off state of the drive module; A drive power supply module, wherein the input terminal of the drive power supply module is connected to a power supply, and the output terminal of the drive power supply module is connected to the drive module to supply power to the drive module; The bootstrap charging module has its first end connected to the output ends of the drive module and the drive power supply module, and its tail end connected to the output end of the drive module. The drive power supply module includes a power supply switch module and a power supply modulation module. The power supply switch module and the power supply modulation module are connected to form at least a partial power supply control branch. The input terminal of the power supply control branch is connected to the power supply, and the output terminal of the power supply control branch is connected to the drive module. The control module is connected to the controlled terminal of the power supply switch module to control the on / off state of the power supply switch module.

2. The bootstrap charging low-power circuit according to claim 1, characterized in that: The bootstrap charging module includes a capacitor C3. The first end of the capacitor C3 is connected to the output end of the driving module and the driving power supply module, respectively, and the second end of the capacitor C3 is connected to the output end of the driving module.

3. The bootstrap charging low-power circuit according to claim 2, characterized in that: The driving module comprises three modules: a first driving module, a second driving module, and a third driving module. The bootstrap charging module further includes capacitors C4 and C5. The first end of capacitor C3 is connected to the output terminals of the first driving module and the driving power supply module, and the last end of capacitor C3 is connected to the output terminal of the first driving module. The first end of capacitor C4 is connected to the output terminals of the second driving module and the driving power supply module, and the last end of capacitor C4 is connected to the output terminal of the second driving module. The first end of capacitor C5 is connected to the output terminals of the third driving module and the driving power supply module, and the last end of capacitor C5 is connected to the output terminal of the third driving module.

4. The bootstrap charging low-power circuit according to claim 1, characterized in that: The power supply modulation module includes a voltage regulation unit and a diode D1. The input terminal of the voltage regulation unit is connected to the power supply switch module, the output terminal of the voltage regulation unit is connected to the positive terminal of the diode D1, and the negative terminal of the diode D1 is connected to the beginning of the bootstrap charging module and the driving module, respectively.

5. A bootstrap charging low-power circuit according to claim 4, characterized in that: The power supply modulation module also includes a resistor R5 and a capacitor C1. The output terminal of the voltage regulation unit is connected to the first end of the capacitor C1 and the first end of the resistor R5, respectively. The tail end of the resistor R5 is connected to the positive terminal of the diode D1, and the tail end of the capacitor C1 is grounded.

6. The bootstrap charging low-power circuit according to claim 1, characterized in that: The power supply switch module includes a semiconductor switch Q1 and a semiconductor switch Q2. The input terminal of the switch Q1 is connected to the power supply, the output terminal of the switch Q1 is connected to the input terminal of the voltage regulation unit, the input terminal of the switch Q2 is connected to the controlled terminal of the switch Q1, the output terminal of the switch Q2 is grounded, and the control module is connected to the controlled terminal of the switch Q2.

7. A bootstrap charging low-power circuit according to claim 6, characterized in that: The switching transistor Q1 is a transistor, MOSFET, or silicon controlled rectifier.

8. A bootstrap charging low-power circuit according to claim 6, characterized in that: The switching transistor Q2 is a transistor, MOSFET, or silicon controlled rectifier.

9. A motor drive device, characterized in that, Includes the bootstrap charging low-power circuit as described in any one of claims 1 to 6, wherein the output terminal of the drive module is connected to the motor to form a drive branch.

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