A power-on initialization circuit for a motor drive system

Abstract

The present invention provides a power-on initialization circuit for a motor drive system, which includes a power amplitude detection and internal power supply module, a controlled delay module, a waveform shaping module, and a power supply judgment and adjustment module integrated on the same substrate. It is used to detect and manage the voltage changes of each node of the drive system in real time, so that the motor drive system can realize the power-on initialization process from the off state to the normal working state. By integrating the power amplitude detection and internal power supply module, the controlled delay module, the waveform shaping module, and the power supply judgment and adjustment module comprehensively and monolithically, the present invention finally forms a power-on initialization circuit for the motor drive system, which greatly guarantees the reliability of the motor drive system when powered on, and provides a guarantee for the stable and efficient operation of the motor drive system.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor integrated circuit design, and particularly relates to a power-on initialization circuit for a motor drive system. Background Art

[0002] In the prior art, in the actual application process of various drive systems, since there must be a transition process from no voltage to a certain voltage for the normal operating voltage parameters of multiple nodes of the drive system, in order to ensure the stability and reliability of the drive system, it is necessary to implement real-time detection and management of the voltage changes of each node of the drive system during this process. Especially in the field of motor drive system design, it is necessary to perform real-time power-on detection on each key voltage node of the system and perform corresponding control according to the detection data. Summary of the Invention

[0003] The purpose of the present invention is to provide a power-on initialization circuit for a motor drive system 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 power-on initialization circuit for a motor drive system includes a power amplitude detection and internal power supply module, a controlled delay module, a waveform shaping module, and a power supply judgment and adjustment module integrated on the same substrate, which are used to perform real-time detection and management of the voltage changes of each node of the drive system, so that the motor drive system realizes the power-on initialization process from the off state to the normal working state.

[0006] Further, the positive power supply terminal of the power amplitude detection and internal power supply module is connected to an external power supply, and outputs VCC voltage and VA voltage; the positive power supply terminal of the controlled delay module is connected to the VCC voltage output terminal, the input terminal is connected to the VA voltage output terminal, and outputs VB voltage; the positive power supply terminal of the waveform shaping module is connected to the VCC voltage output terminal, the input terminal is connected to the VB voltage output terminal, and outputs VC voltage; the positive power supply terminal of the power supply judgment and adjustment module is connected to the VCC voltage output terminal, the input terminal is connected to the VC voltage output terminal, and outputs VB voltage; the negative power supply terminals of the power amplitude detection and internal power supply module, the controlled delay module, the waveform shaping module, and the power supply judgment and adjustment module are all grounded.

[0007] Further, the power amplitude detection and internal power supply module includes resistors R1, R2, R3, and a zener diode D1. One ends of the resistors R1 and R3 are connected to the external power supply. The other end of the resistor R1 is used as the VA voltage output terminal and is connected to one end of the resistor R2. The other end of the resistor R3 is used as the VCC voltage output terminal and is connected to the cathode of the zener diode D1. The other end of the resistor R2 is connected to the anode of the zener diode D1 and is grounded.

[0008] Further, the controlled delay module includes a resistor R4 and MOS transistors M1, M2, M3, and M4. The source of the MOS transistor M1 is connected to the VCC voltage output terminal, and the gates of the MOS transistors M1 and M2 are interconnected and connected to the VA voltage output terminal. The drains of the MOS transistors M1 and M2 are interconnected and connected to the gate of the MOS transistor M3. The drain of the MOS transistor serves as the VB voltage output terminal and is connected to one end of the resistor R4 and the gate of the MOS transistor M4. One end of the resistor R4 is connected to the VA voltage output terminal, and the drain of the MOS transistor M4 is connected to its own source and the sources of the MOS transistors M2 and M3 and grounded.

[0009] Further, the waveform shaping module includes MOS transistors M5, M6, M7, and M8. The gates of the MOS transistors M5 and M6 are interconnected and connected to the VB voltage output terminal. The sources of the MOS transistors M5 and M7 are interconnected and connected to the VCC voltage output terminal. The drains of the MOS transistors M5 and M6 are interconnected and connected to the gates of the MOS transistors M7 and M8. The gates of the MOS transistors M7 and M8 are interconnected, and the drains of the MOS transistors M7 and M8 are interconnected and then serve as the VC voltage output terminal. The sources of the MOS transistors M6 and M8 are interconnected and grounded.

[0010] Further, the power supply judgment and adjustment module includes resistors R5 and R6, a one-way diode D2, and MOS transistors M9, M10, and M11. One end of the resistor R6 and the one-way diode D2 is connected to the VCC voltage output terminal. The other end of the one-way diode D2 is connected to the source of the MOS transistor M9. The gate of the MOS transistor M9 is connected to the VC voltage output terminal, and the drain is respectively connected to one end of the resistor R5 and the gate of the MOS transistor M10. The drain of the MOS transistor M10 and the gate of the MOS transistor M11 are interconnected and connected to the other end of the resistor R6. The other end of the resistor R5 is connected to the sources of the MOS transistors M10 and M11 and grounded.

[0011] As can be seen from the above technical solutions, after the power amplitude detection and internal power supply module, the controlled delay module, the waveform shaping module, and the power supply judgment and adjustment module are comprehensively integrated and monolithically integrated, the power-on initialization circuit of the motor drive system is finally formed, which greatly ensures the reliability of the power-on of the motor drive system and provides a guarantee for the stable and efficient operation of the motor drive system. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the module connection of the present invention;

[0013] Figure 2 It is a schematic diagram of the circuit connection of the present invention;

[0014] In the figure: 1. Power amplitude detection and internal power supply module; 2. Controlled delay module; 3. Waveform shaping module; 4. Power supply judgment and adjustment module. Specific implementation mode

[0015] The following will make a detailed description of a preferred implementation mode of the present invention in conjunction with the accompanying drawings.

[0016] As Figure 1 shown, the power-on initialization circuit of the motor drive system includes a power amplitude detection and internal power supply module, a controlled delay module, a waveform shaping module, and a power supply judgment and adjustment module integrated on the same substrate; specifically, the positive power supply terminal of the power amplitude detection and internal power supply module is connected to an external power supply, and outputs VCC voltage and VA voltage; the positive power supply terminal of the controlled delay module is connected to the VCC voltage output terminal, the input terminal is connected to the VA voltage output terminal, and outputs VB voltage; the positive power supply terminal of the waveform shaping module is connected to the VCC voltage output terminal, the input terminal is connected to the VB voltage output terminal, and outputs VC voltage; the positive power supply terminal of the power supply judgment and adjustment module is connected to the VCC voltage output terminal, the input terminal is connected to the VC voltage output terminal, and outputs VB voltage; the negative power supply terminals of the above modules are all grounded, and in the figure, the external power supply VDD line and the reference ground GND line are used to represent the circuit application details.

[0017] Specifically, as Figure 2 shown:

[0018] The power amplitude detection and internal power supply module described in this preferred embodiment includes resistors R1, R2, R3, and a zener diode D1. One ends of the resistors R1 and R3 are connected to the external power supply VDD line. The other end of the resistor R1 is used as the VA voltage output terminal and is connected to one end of the resistor R2. The other end of the resistor R3 is used as the VCC voltage output terminal and is connected to the negative electrode of the zener diode D1. The other end of the resistor R2 is connected to the positive electrode of the zener diode D1 and is connected to the reference ground GND line; the power amplitude detection and internal power supply module makes the zener diode D1 have stable bias conditions through the internal resistor R3, specifically manifested as a constant voltage difference between both ends of the zener diode D1. In this way, it realizes automatically using the external power supply of the motor drive system to construct an internal power supply and convert it into the voltage VCC output by one of the output terminals of the power amplitude detection and internal power supply module, and the value of the voltage VCC is the above-mentioned constant voltage difference; the power amplitude detection and internal power supply module also realizes real-time detection of the voltage amplitude of the external power supply of the motor drive system through the series voltage division of the internal resistors R1 and R2 and converts it into the voltage VA output by the other output terminal of the power amplitude detection and internal power supply module for subsequent modules to use.

[0019] The controlled delay module described in this preferred embodiment includes a resistor R4 and MOS transistors M1, M2, M3, and M4. The source of the MOS transistor M1 is connected to the VCC voltage output terminal, and the gates of the MOS transistors M1 and M2 are interconnected and connected to the VA voltage output terminal. The drains of the MOS transistors M1 and M2 are interconnected and connected to the gate of the MOS transistor M3. The drain of the MOS transistor serves as the VB voltage output terminal and is connected to one end of the resistor R4 and the gate of the MOS transistor M4. The other end of the resistor R4 is connected to the VA voltage output terminal. The drain of the MOS transistor M4 is connected to its own source and the sources of the MOS transistors M2 and M3 and is connected to the reference ground GND line. The input end of this controlled delay module inputs the voltage VA from the output of the power amplitude detection and internal power supply module. The specific parameters of this voltage VA reflect whether the index range of the external power supply voltage amplitude of the motor drive system meets the design requirements of the motor drive system. According to the design specifications of the motor drive system, the external power supply voltage amplitude of the motor drive system must meet the minimum index requirements. Only at this time is the motor drive system allowed to enter the initialization working state from the off state, that is, the management of whether the motor drive system operates out of the off state is realized by controlling the voltage VA. Specifically, the specific parameters of the voltage VA are detected by the threshold amplifier formed by the MOS transistors M1 and M2 inside the controlled delay module. The output end of the controlled delay module outputs the voltage VB that is jointly managed and controlled with the output end of the power supply judgment and adjustment module. The specific parameters of this voltage VB reflect whether the requirement of the delay time length is completed. Specifically, the detection of the completion ratio of the delay time length is realized by the delay circuit formed by the MOS transistors M3, M4 and the resistor R4 inside the controlled delay module, and is manifested as the specific voltage value of the above voltage VB.

[0020] The waveform shaping module described in this preferred embodiment includes MOS transistors M5, M6, M7, and M8. The gates of the MOS transistors M5 and M6 are interconnected and connected to the VB voltage output terminal. The sources of the MOS transistors M5 and M7 are interconnected and connected to the VCC voltage output terminal. And the drains of the MOS transistors M5 and M6 are interconnected and connected to the gates of the MOS transistors M7 and M8. The gates of the MOS transistors M7 and M8 are interconnected and the drains of the MOS transistors M7 and M8 are interconnected and then serve as the VC voltage output terminal. The sources of the MOS transistors M6 and M8 are interconnected and connected to the reference ground GND line. The input end of this waveform shaping module inputs the voltage VB. The output end of the waveform shaping module outputs the voltage VC. And after being processed by the waveform shaping module, the voltage VC will become a standard digital logic level and is applicable to the design of other modules of the motor drive system. Specifically, through the non-inverting amplifier formed by the MOS transistors M5, M6, M7, and M8, the above voltage VB is adjusted to the voltage VC that is a standard digital logic level and is applicable to the design of other modules of the motor drive system.

[0021] The power supply judgment and adjustment module described in this preferred embodiment includes resistors R5 and R6, a one-way diode D2, and MOS transistors M9, M10, and M11. One end of the resistor R6 and the one-way diode D2 is connected to the VCC voltage output terminal. The other end of the one-way diode D2 is connected to the source electrode of the MOS transistor M9. The gate electrode of the MOS transistor M9 is connected to the VC voltage output terminal, and the drain electrode is respectively connected to one end of the resistor R5 and the gate electrode of the MOS transistor M10. The drain electrode of the MOS transistor M10 and the gate electrode of M11 are interconnected and connected to the other end of the resistor R6. The other end of the resistor R5 is connected to the source electrodes of the MOS transistors M10 and M11 and is connected to the reference ground GND wire. The power supply judgment and adjustment module comprehensively judges whether the input voltage VB is still required based on the specific parameters of the voltage VCC and the voltage VC connected to its positive power supply terminal. Specifically, the above judgment is achieved through the voltage superposition value of the sum of the turn-on voltage value of the one-way diode D2 and the turn-on voltage value of the MOS transistor M9 inside the power supply judgment and adjustment module. If this voltage superposition value is large enough, it means that the controller composed of the resistor R5, the resistor R6, and the MOS transistor M10 can turn on the MOS transistor M11 and realize the control of the above voltage VB. At this time, it indicates that the voltage VB is jointly managed and controlled by the controlled delay module and the power supply judgment and adjustment module. If this voltage superposition value is small enough, it means that the controller composed of the resistor R5, the resistor R6, and the MOS transistor M10 cannot turn on the MOS transistor M11. In this way, the power supply judgment and adjustment module no longer participates in the control of the above voltage VB. At this time, the voltage VB that reflects whether the requirement of the delay time length is met will only be controlled by the controlled delay module.

[0022] The power-on initialization circuit described in this preferred embodiment is used to detect and manage the voltage changes of each node of the drive system in real time, enabling the motor drive system to realize the power-on initialization process from the off state to the normal working state. The specific working mode and principle are as follows:

[0023] For any drive system, including motor drive systems, external power supply is required to make it work. And to ensure the overall performance of the motor drive system, the voltage of the external power supply for the motor drive system must meet the minimum voltage amplitude index. Under normal circumstances, the voltage value of the external power supply for the motor drive system must be higher than this minimum voltage amplitude index to allow the motor drive system to enter the normal working state; otherwise, the motor drive system must be in the off state. Therefore, the power supply amplitude detection and internal power supply module described in the present invention detects the voltage amplitude of the external power supply for the motor drive system in real time and converts it into the voltage VA output from another output terminal of the power supply amplitude detection and internal power supply module. When the voltage value of the external power supply for the motor drive system is not higher than the aforementioned required minimum voltage amplitude index of the power supply, the voltage VA is a low voltage amplitude and indicates that the motor drive system is not allowed to enter the power-on initialization state at this time, and the motor drive system will remain in the off state. When the voltage value of the external power supply for the motor drive system is higher than the aforementioned required minimum voltage amplitude index of the power supply, the voltage VA is a high voltage amplitude and indicates that the motor drive system is allowed to enter the power-on initial state;

[0024] In specific use, to reduce the power consumption of the motor drive system and improve the performance of the motor drive system, the voltage amplitude of the power supply for the unit modules within the motor drive system should not be too high, and it is also required that its minimum voltage amplitude index should be sufficient to meet the working requirements of the unit modules. The power supply for the unit modules within the motor drive system involved in the present invention comes from the internal power supply automatically constructed by the power supply amplitude detection and internal power supply module. The amplitude of this internal power supply voltage is lower and controllable compared to the voltage of the external power supply for the motor drive system. Specifically, the internal power supply voltage is the voltage VCC output from one of the output terminals of the power supply amplitude detection and internal power supply module;

[0025] Secondly, there must be a process of establishing the normal operating voltage parameters of multiple nodes in the motor drive system from scratch. In particular, the external power supply voltage parameters of the motor drive system and the voltage VCC parameter output from one of the output terminals of the power amplitude detection and internal power supply module are independent of each other in the process of establishing from scratch and transitioning from the initial zero state to a stable state. The time required for completion of establishment is also different for each. However, it must be ensured that the indicators of the external power supply voltage of the motor drive system and the power supply voltage of the unit modules within the motor drive system can meet the expected requirements before the motor drive system can be taken out of the shutdown state and transition to the normal operating state. For the former, as previously described, the judgment is completed through the voltage VA output from the other output terminal of the power amplitude detection and internal power supply module. For the latter, the power supply judgment and adjustment module jointly completes the judgment after comprehensively considering the voltage VCC parameter output from one of the output terminals of the power amplitude detection and internal power supply module connected to its positive power supply terminal and the voltage VC parameter with standard digital logic level attributes output from the output terminal of the waveform shaping module. Only when the amplitude of the voltage VCC is sufficient to meet the operating requirements of the unit modules within the motor drive system and the voltage VC with standard digital logic level attributes is at a low voltage amplitude, does the power supply judgment and adjustment module allow the controlled delay module to perform the calculation of the delay time length, and this delay time length should also be long enough, that is, it can cover the time requirement for the external power supply voltage parameters of the motor drive system or the voltage VCC parameter output from one of the output terminals of the power amplitude detection and internal power supply module to be established from scratch and reach stability. Otherwise, the controlled delay module is not allowed to perform the calculation of the delay time length and keeps the aforementioned voltage VB at a low voltage amplitude;

[0026] Whether the calculation of the delay time length performed by the controlled delay module of the present invention can be carried out depends not only on the management and control of the power supply judgment and adjustment module, but also on the controlled delay module's judgment of the voltage VA output from the other output terminal of the power amplitude detection and internal power supply module at its input terminal. When the voltage VA is at a low voltage amplitude, which indicates that the motor drive system is not allowed to enter the initial startup state at this time, the controlled delay module is not allowed to perform the calculation of the delay time length and keeps the aforementioned voltage VB at a low voltage amplitude. When the voltage VA is at a high voltage amplitude, which indicates that the motor drive system is allowed to enter the initial startup state at this time, the controlled delay module is allowed to perform the calculation of the delay time length, and after the set delay timing time, the output voltage VB at the output terminal of the controlled delay module changes from a low voltage amplitude to a high voltage amplitude;

[0027] Meanwhile, the input end of the waveform shaping module receives a voltage VB that is jointly managed and controlled by the output end of the controlled delay module and the output end of the power supply judgment and adjustment module, and outputs a voltage VC at the output end of the waveform shaping module that is in phase with the voltage VB and has the property of a standard digital logic level. As described above, when the motor drive system allows the calculation of the delay time length and after the set delay time is counted, the voltage VB changes from a low voltage amplitude to a high voltage amplitude, then the voltage VC also changes from a low voltage amplitude to a high voltage amplitude and turns off the power supply judgment and adjustment module. Thus, the startup initialization process of the motor drive system from the off state to the normal working state is completed, greatly ensuring the reliability of the motor drive system when powered on and providing guarantee for the stable and efficient operation of the motor drive system.

[0028] 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. An initial startup circuit for a motor drive system, characterized in that, it includes a power amplitude detection and internal power supply module, a controlled delay module, a waveform shaping module, and a power supply judgment and adjustment module integrated on the same substrate, which are used to detect and manage the voltage changes of each node of the drive system in real time, so that the motor drive system realizes the initial startup process of transitioning from the off state to the normal working state; automatically uses the external power supply of the motor drive system to construct an internal power supply and converts it into the voltage VCC output from one of the output terminals of the power amplitude detection and internal power supply module; the power amplitude detection and internal power supply module also realizes the real-time detection of the voltage amplitude of the external power supply of the motor drive system through the series voltage division of internal resistors R1 and R2 and converts it into the voltage VA output from the other output terminal of the power amplitude detection and internal power supply module for subsequent modules to use; the delay time length completion ratio is detected through the delay circuit composed of MOS transistors M3 and M4 and resistor R4 inside the controlled delay module, and is represented as the specific voltage value of voltage VB; voltage VB is adjusted to a standard digital logic level and voltage VC applicable to other module designs of the motor drive system; the power supply judgment and adjustment module comprehensively judges whether voltage VB needs to be input according to the specific parameters of the voltage VCC and voltage VC connected to its positive power supply terminal.

2. The initial startup circuit for a motor drive system according to claim 1, characterized in that, the positive power supply terminal of the power amplitude detection and internal power supply module is connected to the external power supply, and outputs VCC voltage and VA voltage; the positive power supply terminal of the controlled delay module is connected to the VCC voltage output terminal, the input terminal is connected to the VA voltage output terminal, and outputs VB voltage; the positive power supply terminal of the waveform shaping module is connected to the VCC voltage output terminal, the input terminal is connected to the VB voltage output terminal, and outputs VC voltage; the positive power supply terminal of the power supply judgment and adjustment module is connected to the VCC voltage output terminal, the input terminal is connected to the VC voltage output terminal, and outputs VB voltage; the negative power supply terminals of the power amplitude detection and internal power supply module, the controlled delay module, the waveform shaping module, and the power supply judgment and adjustment module are all grounded.

3. The initial startup circuit for a motor drive system according to claim 2, characterized in that, the power amplitude detection and internal power supply module includes resistors R1, R2, R3, and a zener diode D1. One end of resistors R1 and R3 is connected to the external power supply. The other end of resistor R1 is used as the VA voltage output terminal and is connected to one end of resistor R2. The other end of resistor R3 is used as the VCC voltage output terminal and is connected to the negative electrode of the zener diode D1. The other end of resistor R2 is connected to the positive electrode of the zener diode D1 and grounded.

4. The initial startup circuit for a motor drive system according to claim 2, characterized in that, The controlled delay module includes resistor R4 and MOS transistors M1, M2, M3, and M4. The source of MOS transistor M1 is connected to the VCC voltage output terminal, and the gates of MOS transistors M1 and M2 are interconnected and connected to the VA voltage output terminal. The drains of MOS transistors M1 and M2 are interconnected and connected to the gate of MOS transistor M3. The drain of the MOS transistor serves as the VB voltage output terminal and is connected to one end of resistor R4 and the gate of MOS transistor M4. One end of resistor R4 is connected to the VA voltage output terminal, and the drain of MOS transistor M4 is connected to its own source and the sources of MOS transistors M2 and M3 and is grounded.

5. The power-on initialization circuit of the motor drive system according to claim 2, characterized in that the waveform shaping module includes MOS transistors M5, M6, M7, and M8. The gates of MOS transistors M5 and M6 are interconnected and connected to the VB voltage output terminal. The sources of MOS transistors M5 and M7 are interconnected and connected to the VCC voltage output terminal. The drains of MOS transistors M5 and M6 are interconnected and connected to the gates of MOS transistors M7 and M8. The gates of MOS transistors M7 and M8 are interconnected and the drains of MOS transistors M7 and M8 are interconnected and then serve as the VC voltage output terminal. The sources of MOS transistors M6 and M8 are interconnected and grounded.

6. The power-on initialization circuit of the motor drive system according to claim 2, characterized in that the power supply judgment and adjustment module includes resistors R5 and R6, unidirectional diode D2, and MOS transistors M9, M10, and M11. One end of resistors R6 and unidirectional diode D2 is connected to the VCC voltage output terminal. The other end of the unidirectional diode D2 is connected to the source of MOS transistor M9. The gate of MOS transistor M9 is connected to the VCC voltage output terminal, and the drain is respectively connected to one end of resistor R5 and the gate of MOS transistor M10. The drains of MOS transistor M10 and the gate of M11 are interconnected and connected to the other end of resistor R6. The other end of resistor R5 is connected to the sources of MOS transistors M10 and M11 and is grounded.

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