A circuit for shifting a fixed ground level to a floating ground level in a motor drive system

Abstract

The present invention provides a circuit for shifting a fixed ground level to a floating ground level in a motor drive system, which includes a floating high-level line, a floating output level line, a floating low-level line, a common input level line, and a common ground line for characterizing application details. The circuit includes a controlled switched current source, an upper current rectifier I, an upper current rectifier II, a lower current rectifier, and an amplification and shaping circuit integrated on the same substrate. By integrating each module and monolithically integrating them, the present invention inputs a fixed ground level to the controlled switched current source with the common ground line as the zero-level reference ground, and after shifting and converting through the upper current rectifier I, the upper current rectifier II, the lower current rectifier, and the amplification and shaping circuit, outputs a floating ground level in phase with the fixed ground level, realizing signal communication between a unit with a fixed zero-level reference ground and other units with a floating zero-level reference ground in the motor drive system, and meeting the application requirements of the motor drive.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor integrated circuit design, and particularly relates to a circuit for fixing the ground and shifting the floating ground level in a motor drive system. Background Art

[0002] In the design of various composite drive systems, the reference grounds of the respective unit signal sources are not the same. Especially in the field of motor drive system design, there are usually two reference ground wires, namely the common ground wire and the floating ground low-level wire. Therefore, between the respective units, communication between different reference ground level signals can only be achieved through the operation of a reasonable level shifting circuit, so as to meet the requirements of the actual circuit. Summary of the Invention

[0003] The purpose of the present invention is to provide a circuit for fixing the ground and shifting the floating ground level in a motor drive system, so as to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A circuit for fixing the ground and shifting the floating ground level in a motor drive system includes a floating high-level wire, a floating output level wire, a floating low-level wire, a common input level wire, and a common ground wire for characterizing application details. The circuit includes a controlled switch current source, an upper current rectifier I, an upper current rectifier II, a lower current rectifier, and an amplification and shaping circuit integrated on the same substrate. Taking the common ground wire as the zero-level reference ground, a fixed ground level is input to the controlled switch current source, and after being shifted and converted by the upper current rectifier I, the upper current rectifier II, the lower current rectifier, and the amplification and shaping circuit, a floating ground level in phase with the fixed ground level is output.

[0006] Further, the controlled switch current source is provided with two input terminals and two output terminals. One of the input terminals is externally connected to the common input level wire, and the other input terminal is externally connected to the common ground wire. The first output terminal and the second output terminal respectively output currents I1 and I2. The power supply section of the upper current rectifier I is externally connected to the floating high-level wire, the input terminal is connected to the current I1, and the output terminal outputs the current I3. The power supply section of the upper current rectifier II is externally connected to the floating high-level wire, the input terminal is connected to the current I2, and the output terminal outputs the current I4. The power supply section of the lower current rectifier is externally connected to the floating low-level wire, the input terminal is connected to the current I3, and the output terminal outputs the current I5. The amplification and shaping circuit is provided with two power supply terminals, which are externally connected to the floating high-level wire and the floating low-level wire respectively. The input terminal is connected to the current I6, and the magnitude of the current I6 is the difference between I4 and I5. The output terminal outputs a floating ground level in phase with the input fixed level of the controlled switch current source and is externally connected to the floating output level wire.

[0007] Further, the controlled switched current source includes a bias voltage source VBIAS, MOS transistors M1, M2, and M3. The positive pole of the bias voltage source VBIAS is connected to the gate of MOS transistor M1, and the negative pole is connected to the source of MOS transistor M1 and then connected to the common ground wire. The drain of MOS transistor M1 is respectively connected to the source of MOS transistor M2 and the drain of MOS transistor M3. The gates of MOS transistors M2 and M3 are interconnected and connected to the common input level line. The drain of MOS transistor M2 is used to output current I1, and the source of MOS transistor M3 is used to output current I2.

[0008] Further, the first upper current rectifier includes MOS transistors M4 and M5. The drain of MOS transistor M4 is connected to the output terminal of current I1, and the gate of MOS transistor M4 is interconnected with its own drain and connected to the gate of MOS transistor M5. The sources of MOS transistors M1 and M2 are interconnected and connected to the floating high-end level line. The drain of MOS transistor M5 is used to output current I3.

[0009] Further, the second upper current rectifier includes MOS transistors M6 and M7. The drain of MOS transistor M6 is connected to the output terminal of current I2, and the gate of MOS transistor M6 is interconnected with its own drain and connected to the gate of MOS transistor M7. The sources of MOS transistors M6 and M7 are interconnected and connected to the floating high-end level line. The drain of MOS transistor M7 is used to output current I4.

[0010] Further, the lower current rectifier includes MOS transistors M8 and M9. The drain of MOS transistor M8 is connected to the output terminal of current I3, and the gate of MOS transistor M8 is interconnected with its own drain and connected to the gate of MOS transistor M9. The sources of MOS transistors M8 and M9 are interconnected and connected to the floating low-end level line. The drain of MOS transistor M9 is used to output current I5.

[0011] Further, the amplification and shaping circuit includes MOS transistors M10 and M11. The gates of MOS transistors M10 and M11 are interconnected and connected to the output terminals of currents I4 and I5. The drains of MOS transistors M10 and M11 are interconnected and connected to the floating output level line. The source of MOS transistor M10 is connected to the floating high-end level line, and the source of MOS transistor M11 is connected to the floating low-end level line.

[0012] As can be seen from the above technical solutions, the present invention integrates each module and monolithically integrates them. Using the common ground wire as the zero-level reference ground, a fixed ground level is input to the controlled switched current source. After being shifted and converted by the first upper current rectifier, the second upper current rectifier, the lower current rectifier, and the amplification and shaping circuit, a floating ground level in phase with the fixed ground level is output, realizing signal communication between the unit with a fixed zero-level reference ground and other units with a floating zero-level reference ground in the motor drive system, meeting the application requirements of motor drive. Brief Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the module connection of the present invention;

[0014] Figure 2 It is a schematic diagram of the power connection of the present invention;

[0015] In the figure: 1, controlled switch current source; 2, upper current rectifier 1; 3, upper current rectifier 2; 4, lower current rectifier; 5, amplification and shaping circuit. Detailed Embodiment

[0016] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0017] As Figure 1 shown in the motor drive system, a circuit for shifting the fixed ground level to the floating ground level, the circuit includes a controlled switch current source, an upper current rectifier 1, an upper current rectifier 2, a lower current rectifier, and an amplification and shaping circuit integrated on the same substrate. The fixed ground level is input to the controlled switch current source with the ordinary ground wire as the zero-level reference ground, and after being shifted and converted by the upper current rectifier 1, the upper current rectifier 2, the lower current rectifier, and the amplification and shaping circuit, a floating ground level in the same phase as the fixed ground level is output; the present invention uses the floating high-level line, the floating output level line, the floating low-level line, the ordinary input level line, and the ordinary ground wire to characterize the application details; specifically, the controlled switch current source is provided with two input terminals and two output terminals, wherein the first input terminal is externally connected to the ordinary input level line, the second input terminal is externally connected to the ordinary ground wire, and the first output terminal and the second output terminal output currents I1 and I2 respectively; the power supply section of the upper current rectifier 1 is externally connected to the floating high-level line, the input terminal is connected to the current I1, and the output terminal outputs the current I3; the power supply section of the upper current rectifier 2 is externally connected to the floating high-level line, the input terminal is connected to the current I2, and the output terminal outputs the current I4; the power supply section of the lower current rectifier is externally connected to the floating low-level line, the input terminal is connected to the current I3, and the output terminal outputs the current I5; the amplification and shaping circuit is provided with two power supply terminals, which are externally connected to the floating high-level line and the floating low-level line respectively, the input terminal is connected to the current I6, and the magnitude of the current I6 is the difference between I4 and I5, and the output terminal outputs a floating ground level in the same phase as the input fixed level of the controlled switch current source and is externally connected to the floating output level line.

[0018] As Figure 2 shown, in the specific use:

[0019] The controlled switched current source described in this preferred embodiment includes a bias voltage source VBIAS, MOS transistors M1, M2, and M3. The positive pole of the bias voltage source VBIAS is connected to the gate of MOS transistor M1, and the negative pole is connected to the source of MOS transistor M1 and then connected to the common ground wire. The drain of MOS transistor M1 is respectively connected to the source of MOS transistor M2 and the drain of MOS transistor M3. The gates of MOS transistors M2 and M3 are interconnected and connected to the common input level line. The drain of MOS transistor M2 is used to output current I1, and the source of MOS transistor M3 is used to output current I2. Taking the common ground wire as its zero-level reference point, the input fixed ground level of the controlled switched current source can be divided into two values: input fixed ground low level and input fixed ground non-low level. When the input fixed ground level is the input fixed ground low level, the relationship of the output current of the controlled switched current source is characterized as "I1 is greater than I2". When the input fixed ground level is the input fixed ground non-low level, the relationship of the output current of the controlled switched current source is characterized as "I1 is less than I2".

[0020] The first upper current rectifier described in this preferred embodiment includes MOS transistors M4 and M5. The drain of MOS transistor M4 is connected to the current I1 output terminal, and the gate of MOS transistor M4 is interconnected with its own drain and connected to the gate of MOS transistor M5. The sources of MOS transistors M1 and M2 are interconnected and connected to the floating high-level line. The drain of MOS transistor M5 is used to output current I3. The power supply section of the first upper current rectifier is externally connected to the floating high-level line, and the input terminal is connected to current I1. After this current is converted by the first upper current rectifier, current I3 is output from the output terminal of the first upper current rectifier, and the value of current I3 is equal to the value of current I1.

[0021] The second upper current rectifier described in this preferred embodiment includes MOS transistors M6 and M7. The drain of MOS transistor M6 is connected to the current I2 output terminal, and the gate of MOS transistor M6 is interconnected with its own drain and connected to the gate of MOS transistor M7. The sources of MOS transistors M6 and M7 are interconnected and connected to the floating high-level line. The drain of MOS transistor M7 is used to output current I4. The power supply section of the second upper current rectifier is externally connected to the floating high-level line, and the input terminal is connected to current I2. After this current is converted by the second upper current rectifier, current I4 is output from the output terminal of the first upper current rectifier, and the value of current I4 is equal to the value of current I2.

[0022] The lower current rectifier described in this preferred embodiment includes MOS transistors M8 and M9. The drain of MOS transistor M8 is connected to the output terminal of current I3, and the gate of MOS transistor M8 is interconnected with its own drain and connected to the gate of MOS transistor M9. The sources of MOS transistors M8 and M9 are interconnected and connected to the floating ground low-level line. The drain of MOS transistor M9 is used to output current I5. The power supply section of the lower current rectifier is externally connected to the floating ground low-level line, and the input terminal is connected to current I3. After being converted by the lower current rectifier, current I5 is output from the output terminal of the lower current rectifier, and the value of current I5 is equal to the value of current I3, that is, equal to the value of current I1.

[0023] The amplification and shaping circuit described in this preferred embodiment includes MOS transistors M10 and M11. The gates of MOS transistors M10 and M11 are interconnected and connected to the output terminals of currents I4 and I5. The drains of MOS transistors M10 and M11 are interconnected and connected to the floating ground output level line. The source of MOS transistor M10 is connected to the floating ground high-level line, and the source of MOS transistor M11 is connected to the floating ground low-level line. The amplification and shaping circuit is provided with two power supply terminals, which are externally connected to the floating ground high-level line and the floating ground low-level line respectively. The input terminal is connected to current I6, and the magnitude of current I6 is the difference between I4 and I5. According to the above relationship of equal current values, it can also be described as the difference between the current I1 and the current I2 output by the controlled switch current source, and its positive and negative attributes characterize the relationship between the two output currents of the controlled switch current source, and further characterize the different types of the input fixed ground level of the controlled switch current source:

[0024] When the input current I6 of the amplification and shaping circuit has a negative attribute, that is, it corresponds to the situation where the relationship between the two output currents of the controlled switch current source is "I1 is greater than I2", which further characterizes that the input fixed ground level of the controlled switch current source at this time is specifically the input fixed ground low level;

[0025] On the contrary, when the input current I6 of the amplification and shaping circuit has a positive attribute, that is, it corresponds to the situation where the relationship between the two output currents of the controlled switch current source is "I1 is less than I2", which further characterizes that the input fixed ground level of the controlled switch current source at this time is specifically the input fixed ground non-low level;

[0026] Specifically, taking the floating low - end level line as its zero - level reference ground, when the input current I6 of the amplification and shaping circuit has a negative value attribute, the floating ground level output by the amplification and shaping circuit is the voltage of the floating low - end level line; when the input current I6 of the amplification and shaping circuit has a positive value attribute, the floating ground level output by the amplification and shaping circuit is the voltage of the floating high - end level line, thus realizing the above - mentioned in - phase relationship. Moreover, the floating ground level output by the amplification and shaping circuit is externally connected to the floating output level line, finally completing the function of shifting the input fixed ground level with the ordinary ground wire as its zero - level reference ground to the output floating ground level in phase with it; realizing signal communication between units with a fixed zero - level reference ground and other units with a floating zero - level reference ground in the motor drive system, meeting the circuit application requirements.

[0027] The above - described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A circuit for shifting a fixed ground level to a floating ground level in a motor drive system, including a floating high-end level line, a floating output level line, a floating low-end level line, a common input level line, and a common ground line for characterizing application details, characterized in that, The circuit includes a controlled switched current source, an upper current rectifier I, an upper current rectifier II, a lower current rectifier, and an amplification and shaping circuit integrated on the same substrate. The solid ground level is input to the controlled switched current source with the common ground wire as the zero-level reference ground, and after being shifted and converted by the upper current rectifier I, the upper current rectifier II, the lower current rectifier, and the amplification and shaping circuit, a floating ground level in phase with the solid ground level is output.

2. The circuit for fixing the ground voltage and shifting the floating ground voltage in a motor drive system according to claim 1, characterized in that, The controlled switched current source is provided with two input terminals and two output terminals. One input terminal is externally connected to a common input level wire, and the other input terminal is externally connected to a common ground wire. Output terminal I and output terminal II output currents I1 and I2 respectively. The power supply section of the upper current rectifier I is externally connected to a floating high-end level wire, the input terminal is connected to current I1, and the output terminal outputs current I3. The power supply section of the upper current rectifier II is externally connected to a floating high-end level wire, the input terminal is connected to current I2, and the output terminal outputs current I4. The power supply section of the lower current rectifier is externally connected to a floating low-end level wire, the input terminal is connected to current I3, and the output terminal outputs current I5. The amplification and shaping circuit is provided with two power supply terminals, externally connected to the floating high-end level wire and the floating low-end level wire respectively. The input terminal is connected to current I6, and the magnitude of current I6 is the difference between I4 and I5. The output terminal outputs a floating ground level in phase with the input fixed level of the controlled switched current source and is externally connected to a floating output level wire.

3. The circuit for fixing the ground voltage shift and floating the ground voltage in the motor drive system according to claim 1, characterized in that The controlled switched current source includes a bias voltage source VBIAS, MOS transistors M1, M2, and M3. The positive electrode of the bias voltage source VBIAS is connected to the gate of MOS transistor M1, and the negative electrode is connected to the source of MOS transistor M1 and then connected to the common ground wire. The drain of MOS transistor M1 is respectively connected to the source of MOS transistor M2 and the drain of MOS transistor M3. The gates of MOS transistors M2 and M3 are interconnected and connected to the common input level wire. The drain of MOS transistor M2 is used to output current I1, and the source of MOS transistor M3 is used to output current I2.

4. The circuit for fixing the ground voltage level and shifting the floating ground voltage level in a motor drive system according to claim 1, characterized in that, The upper current rectifier I includes MOS transistors M4 and M5. The drain of MOS transistor M4 is connected to the output terminal of current I1, and the gate of MOS transistor M4 is interconnected with its own drain and connected to the gate of MOS transistor M5. The sources of MOS transistors M1 and M2 are interconnected and connected to the floating high-end level wire. The drain of MOS transistor M5 is used to output current I3.

5. A circuit for fixing a ground voltage shift and floating a ground voltage in a motor drive system according to claim 1, characterized in that, The upper current rectifier II includes MOS transistors M6 and M7. The drain of MOS transistor M6 is connected to the output terminal of current I2, and the gate of MOS transistor M6 is interconnected with its own drain and connected to the gate of MOS transistor M7. The sources of MOS transistors M6 and M7 are interconnected and connected to the floating high-end level wire. The drain of MOS transistor M7 is used to output current I4.

6. The circuit for fixing the ground electrical level and shifting the floating ground level in a motor drive system according to claim 1, characterized in that, The lower current rectifier includes MOS transistors M8 and M9. The drain of MOS transistor M8 is connected to the output terminal of current I3, and the gate of MOS transistor M8 is interconnected with its own drain and connected to the gate of MOS transistor M9. The sources of MOS transistors M8 and M9 are interconnected and connected to the floating low-end level wire. The drain of MOS transistor M9 is used to output current I5.

7. The circuit for shifting the fixed ground level to floating ground level in a motor drive system according to claim 1, characterized in that, The amplification and shaping circuit includes MOS transistors M10 and M11. The gates of the MOS transistors M10 and M11 are interconnected and connected to the output terminals of currents I4 and I5. The drains of the MOS transistors M10 and M11 are interconnected and connected to the floating ground output level line. The source of the MOS transistor M10 is connected to the floating ground high-level line, and the source of the MOS transistor M11 is connected to the floating ground low-level line.

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