WO2021168906A1 - 一种伺服驱动器及其过流故障保护电路 - Google Patents

一种伺服驱动器及其过流故障保护电路 Download PDF

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WO2021168906A1
WO2021168906A1 PCT/CN2020/078519 CN2020078519W WO2021168906A1 WO 2021168906 A1 WO2021168906 A1 WO 2021168906A1 CN 2020078519 W CN2020078519 W CN 2020078519W WO 2021168906 A1 WO2021168906 A1 WO 2021168906A1
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circuit
fault protection
protection circuit
preset
processor
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PCT/CN2020/078519
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English (en)
French (fr)
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童文邹
屈江民
赵勇军
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浙江禾川科技股份有限公司
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Priority to ZA2021/00347A priority Critical patent/ZA202100347B/en
Publication of WO2021168906A1 publication Critical patent/WO2021168906A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to abnormalities in the input circuit, e.g. transients in the DC input

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  • the present invention relates to the field of servo drives, in particular to an over-current fault protection circuit.
  • the present invention also relates to a servo drive.
  • Servo drives and inverters can both rectify and invert electrical energy and then supply power to loads such as motors.
  • the controllable switches in the inverter unit have limited current carrying capacity. Wiring errors or damage to the components in the inverter unit cause excessive current in the bus circuit of the servo drive or inverter, which is likely to cause damage to the controllable switches in the inverter unit.
  • This over-current fault protection circuit can detect the over-current phenomenon in the bus circuit in time and perform corresponding protection, which is likely to cause damage to the controllable switch and other devices, which increases the cost.
  • an overcurrent fault protection circuit including:
  • An electric energy parameter detection module arranged in the bus circuit, used to detect a preset type of electric energy parameter in the bus circuit;
  • the processing devices respectively connected to the electric energy parameter detection module and the inverter unit in the bus circuit are used for controlling the inverter when it is determined according to the electric energy parameters that the current value in the bus circuit is greater than a preset threshold.
  • the variable unit stops working.
  • the processing device includes:
  • the first comparison circuit connected to the electric energy parameter detection module is configured to generate a first trigger signal when it is determined according to the electric energy parameter that the current value in the bus loop is greater than a first preset sub-threshold;
  • a second comparison circuit connected to the electrical energy parameter detection module is configured to generate a second trigger signal when it is determined according to the electrical energy parameter that the current value in the bus circuit is greater than a second preset sub-threshold;
  • the processors respectively connected to the first comparison circuit and the second comparison circuit are used to control the inverter unit to stop working and control when the first trigger signal is received within a preset time period after power-on
  • the reminder prompts a short-circuit fault to ground; when the second trigger signal is received after a preset period of time after power-on, the inverter unit is controlled to stop working and the reminder is controlled to prompt an over-current fault;
  • the overcurrent fault protection circuit also includes:
  • a reminder connected to the processor.
  • the electrical energy parameter detection module includes:
  • the voltage divider resistor connected in series in the bus loop is used to divide the voltage value of the preset value in the bus loop.
  • the first comparison circuit includes:
  • a first operational amplifier connected to the voltage divider resistor, configured to amplify the voltage value by a preset ratio
  • a first comparator respectively connected to the first operational amplifier and the processor is configured to control the first trigger switch to be turned on when the voltage value after amplifying a preset ratio is greater than a reference voltage value;
  • the control terminal is connected to the first comparator, the first terminal is respectively connected to the pull-up power module and the processor, and the first trigger switch with the second terminal grounded is used to control the processor to receive Low level
  • the second comparison circuit includes:
  • a second operational amplifier connected to the voltage divider resistor, configured to amplify the voltage value by a preset ratio
  • a second comparator respectively connected to the second operational amplifier and the processor is configured to control the second trigger switch to be turned on when the voltage value after amplifying the preset ratio is greater than the reference voltage value;
  • the control terminal is connected to the second comparator, the first terminal is respectively connected to the pull-up power module and the processor, and the second trigger switch whose second terminal is grounded is used to control the processor when it is turned on Received low level;
  • the processing device further includes:
  • the pull-up power module is configured to pull up the detection terminal of the processor to a high level when the first trigger switch or the second trigger switch is turned off;
  • the reference voltage module respectively connected to the first comparator and the second comparator is used to provide the reference voltage value for the first comparator and the second comparator;
  • the first trigger signal and the second trigger signal are both the low level.
  • the first trigger switch and the second trigger switch are both photocouplers.
  • the power supplies of the first operational amplifier and the second operational amplifier are both positive and negative power supplies.
  • the reminder is a display and/or an alarm.
  • the processor is a field programmable logic gate array FPGA or an ARM processor.
  • the overcurrent fault protection circuit further includes:
  • the inverter unit drive circuit connected to the processor is used to control the controllable switch in the inverter unit to gradually turn on at a preset frequency within the preset time period after power-on.
  • the present invention also provides a servo driver, which includes the overcurrent fault protection circuit as described in any one of the above.
  • the present invention provides an overcurrent fault protection circuit.
  • This application can detect the electrical energy parameters in the bus circuit, and can control the inverter unit to stop working when it is determined according to the electrical energy parameters that the current value in the bus circuit is greater than a preset threshold, and It can detect over-current faults in time and disconnect the bus circuit to protect the controllable switches in the inverter unit, reducing costs, and the way to disconnect the bus circuit is to control the inverter unit to stop working, and there is no need to add in the bus circuit Other devices save cost.
  • the present invention also provides a servo driver, which has the same beneficial effects as the above overcurrent fault protection circuit.
  • Figure 1 is a schematic structural diagram of an overcurrent fault protection circuit provided by the present invention
  • Fig. 2 is a schematic structural diagram of another overcurrent fault protection circuit provided by the present invention.
  • the core of the present invention is to provide an overcurrent fault protection circuit, which can detect overcurrent faults in time and disconnect the bus circuit to protect the controllable switches and other devices in the inverter unit, thereby reducing costs; another core of the present invention is A servo drive including the above-mentioned over-current fault protection circuit is provided, which can detect over-current faults in time and disconnect the bus circuit to protect the controllable switches and other devices in the inverter unit, thereby reducing the cost.
  • FIG. 1 is a schematic structural diagram of an overcurrent fault protection circuit provided by the present invention, including:
  • the electric energy parameter detection module 1 arranged in the bus circuit is used to detect preset types of electric energy parameters in the bus circuit;
  • the processing device 2 respectively connected to the electric energy parameter detection module 1 and the inverter unit in the bus circuit is used to control the inverter unit to stop working when it is determined according to the electric energy parameter that the current value in the bus circuit is greater than the preset threshold.
  • the electric energy parameter detection module 1 in the embodiment of the present invention can first detect the preset types of electric energy parameters in the bus circuit, and the processing device 2 It can be judged according to the electric energy parameters whether the current value in the bus circuit is greater than the preset threshold. Once it is greater, the bus circuit is not suitable to continue to be energized at this time, which may cause damage to related components and increase maintenance costs. Therefore, the processing device 2 can be in the bus circuit When the current value is greater than the preset threshold, the inverter unit is controlled to stop working, so that the bus circuit is disconnected, and the safety of other devices such as controllable switches is ensured.
  • the preset type may be multiple types, for example, current or voltage, etc., which is not limited in the embodiment of the present invention.
  • the inverter unit is an original device in the bus circuit
  • the bus circuit is disconnected by controlling the inverter unit to stop working, which eliminates the need to add additional devices and saves costs.
  • the way of controlling the inverter unit to stop working can also be of various other types, which are not limited in the embodiment of the present invention.
  • the present invention provides an overcurrent fault protection circuit.
  • This application can detect the electrical energy parameters in the bus circuit, and can control the inverter unit to stop working when it is determined according to the electrical energy parameters that the current value in the bus circuit is greater than a preset threshold, and It can detect over-current faults in time and disconnect the bus circuit to protect the controllable switches in the inverter unit, reducing costs, and the way to disconnect the bus circuit is to control the inverter unit to stop working, and there is no need to add in the bus circuit Other devices save cost.
  • FIG. 2 is a schematic structural diagram of another overcurrent fault protection circuit provided by the present invention.
  • the processing device 2 includes:
  • the first comparison circuit 21 connected to the electric energy parameter detection module 1 is configured to generate a first trigger signal when it is determined according to the electric energy parameter that the current value in the bus circuit is greater than the first preset sub-threshold value;
  • the second comparison circuit 22 connected to the electric energy parameter detection module 1 is configured to generate a second trigger signal when it is determined according to the electric energy parameter that the current value in the bus circuit is greater than the second preset sub-threshold value;
  • the processors respectively connected to the first comparison circuit 21 and the second comparison circuit 22 are used to control the inverter unit to stop working and control the prompter to prompt a short circuit to ground when the first trigger signal is received within a preset time period after power-on Fault; control the inverter unit to stop working and control the prompter to indicate the over-current fault when the second trigger signal is received after a preset period of time after power-on;
  • the overcurrent fault protection circuit also includes:
  • a reminder connected to the processor.
  • over-current faults can generally be divided into two types, one is the direct short-circuit of the bus loop due to device failures and other reasons.
  • the impedance in the bus loop is small, and the fault occurs at this time.
  • the current is usually large, for example, more than 100A, etc., but if the output terminal of the motor is short-circuited to ground due to load wiring errors, etc., because the impedance in the bus circuit is slightly larger than the impedance in the bus circuit when the device fails, this type of The fault current in the case is usually less than the fault current in the first case above, for example, 18A, etc.
  • the first comparison circuit 21 it can be determined whether the first comparison circuit 21 generates the first comparison circuit 21 within a preset period of time after power on.
  • a trigger signal if the first trigger signal is generated, it means that the current value in the bus circuit has exceeded the first preset threshold when the power is just turned on, that is, there may be a short-circuit to ground caused by load wiring errors, etc., and you can pass The reminder prompts a short-to-ground fault; on the other hand, after a preset period of time after power-on (of course, it can also be in any time interval after power-on), the second comparison circuit 22 can be used to determine the bus circuit When the current value is greater than the second preset threshold value, a second trigger signal is generated, and the processor may determine that there is an overcurrent fault in the bus circuit when receiving the second trigger signal, and control the prompter to prompt.
  • the application can accurately distinguish the short-circuit to ground fault caused by the load wiring error and the fault current caused by the damage of the device, and the general fault type (short-circuit to ground) Failure/over-current failure due to component damage) prompts, can guide the staff, facilitate the staff to carry out maintenance work, and improve work efficiency.
  • both the first preset threshold and the second preset threshold can be independently set according to specific conditions.
  • the first preset threshold is smaller than the second preset threshold, which is not limited in this embodiment of the present invention.
  • the preset time period can be independently set, for example, it can be 10 ms, etc., which is not limited in the embodiment of the present invention.
  • the TZ-G signal can be used as the first trigger signal, and the TZ signal can be used as the second trigger signal, which is not limited in the embodiment of the present invention.
  • the electric energy parameter detection module 1 includes:
  • the voltage divider resistor R233 connected in series in the bus circuit is used to divide the voltage value of the preset value in the bus circuit.
  • the voltage value has the characteristic of being easy to collect, which is convenient for the design of the voltage collecting circuit.
  • the electric energy parameter may also be a current, etc., which is not limited in the embodiment of the present invention.
  • the voltage divider resistor R233 has the advantages of small size, low cost, and long life.
  • the voltage divider resistor R233 can be a milliohm-level resistor, which can obtain a millivolt-level sampling voltage.
  • the electric energy parameter detection module 1 may also be of other types, which are not limited in the embodiment of the present invention.
  • the first comparison circuit 21 includes:
  • the first operational amplifier connected to the voltage divider resistor R233 is used to amplify the voltage value by a preset ratio
  • the first comparator respectively connected to the first operational amplifier and the processor is used to control the first trigger switch to be turned on when the voltage value after amplifying the preset ratio is greater than the reference voltage value;
  • the control terminal is connected to the first comparator, the first terminal is respectively connected to the pull-up power module and the processor, and the first trigger switch whose second terminal is grounded is used to control the processor to receive a low level when it is turned on;
  • the second comparison circuit 22 includes:
  • the second operational amplifier connected to the voltage divider resistor R233 is used to amplify the voltage value by a preset ratio
  • the second comparator respectively connected to the second operational amplifier and the processor is used to control the second trigger switch to be turned on when the voltage value after amplifying the preset ratio is greater than the reference voltage value;
  • the control terminal is connected to the second comparator, the first terminal is respectively connected to the pull-up power module and the processor, and the second trigger switch with the second terminal grounded is used to control the processor to receive a low level when it is turned on;
  • processing device 2 further includes:
  • the pull-up power module is used to pull up the detection terminal of the processor to a high level when the first trigger switch or the second trigger switch is turned off;
  • the reference voltage modules respectively connected to the first comparator and the second comparator are used to provide reference voltage values for the first comparator and the second comparator;
  • both the first trigger signal and the second trigger signal are low level.
  • the first comparison circuit 21 and the second comparison circuit 22 have a similar structure. Both the first operational amplifier and the second operational amplifier can amplify the collected voltage value for subsequent comparison. With different ratios, the corresponding first comparator or second comparator can be used to determine whether the current value in the bus circuit is greater than the corresponding preset threshold. For example, when the reference voltage is the same, in the first comparison circuit 21, The preset ratio can be set to 10 times. The first trigger signal can be generated when the voltage value amplified by 10 times is greater than the preset threshold. In the second comparison circuit 22, the preset ratio can be set to 8 times. The second trigger signal can only be generated when the voltage value after 8 times is greater than the preset threshold.
  • This preset ratio setting method obviously requires the second comparison circuit 22 to generate the second trigger signal when the sampled voltage value is higher. Trigger signal, the first comparison circuit 21 can generate the first trigger signal when the sampled voltage value is not particularly high, that is, the second comparison circuit can determine whether the current value is higher than the second preset threshold, and the first A comparison loop can determine whether the current value is higher than the first preset threshold.
  • first trigger signal and the second trigger signal in the embodiment of the present invention are both low level.
  • first trigger signal and/or the second trigger signal can also be set to a high level. This is not limited.
  • the reference voltage value can be set independently, which is not limited in the embodiment of the present invention.
  • first comparison circuit 21 and the second comparison circuit 22 may also be of other specific types. Make a limit.
  • the first operational amplifier may include a first operational amplifier body U33-A and its peripheral circuits
  • the second operational amplifier may include a second operational amplifier body U33-B and its peripheral circuits.
  • the peripheral circuit of the amplifier body U33-A includes a first proportional resistor R7 and R227, a first filter capacitor C206, a first impedance matching resistor R176, and a first grounding resistor R178.
  • the peripheral circuit of the second operational amplifier body U33-B includes a second The proportional resistors R191 and R183, the second filter capacitor C248, the second impedance matching resistor R209, and the second grounding resistor R217.
  • the first trigger switch and the second trigger switch are both photocouplers.
  • the reference voltage module may include a +15V DC voltage source, third proportional resistors R179, R131, and a linear voltage regulator U27, and the pull-up power module includes a +3.3V DC voltage source, pull-up resistors R220 and R223. .
  • circuit composition of the above-mentioned circuit may also be in various other forms, which are not limited in the embodiment of the present invention.
  • the optocoupler has the advantages of strong and weak electrical isolation, small size and long life.
  • both the first trigger switch and the second trigger switch may also be of various other types, which are not limited in the embodiment of the present invention.
  • the power supplies of the first operational amplifier and the second operational amplifier are both positive and negative power supplies.
  • the positive and negative power supplies can prevent the reverse surge current in the circuit from affecting the first operational amplifier and the second operational amplifier, thereby improving the reliability of the operation of the comparator.
  • the power supplies of the first operational amplifier and the second operational amplifier may also be of other types, which are not limited in the embodiment of the present invention.
  • the reminder is a display and/or alarm.
  • the display has the advantages of intuitive prompting effect, long life and small size, and the alarm has the advantages of small size, low cost, and strong prompting effect.
  • the reminder may also be of various other types, which are not limited in the embodiment of the present invention.
  • the processor is an FPGA (Field Programmable Gate Array, Field Programmable Logic Gate Array) or an ARM processor.
  • FPGA and ARM processors have the advantages of fast processing speed, small size, and low cost.
  • processors may also be of various other types, which are not limited in the embodiment of the present invention.
  • the overcurrent fault protection circuit further includes:
  • the inverter unit drive circuit connected to the processor is used to control the controllable switch in the inverter unit to gradually turn on at a preset frequency within a preset time period after power-on.
  • the controllable switch in the inverter unit may cause excessive current in the bus circuit and may cause damage to related devices.
  • controlling the controllable switch to gradually turn on may be specifically controlling the lower bridge IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) in the inverter unit to gradually turn on at a preset frequency, etc.
  • IGBT Insulated Gate Bipolar Transistor, insulated gate bipolar transistor
  • the preset frequency can be independently set, which is not limited in the embodiment of the present invention.
  • the present invention also provides a servo driver, including the overcurrent fault protection circuit in the foregoing embodiment.

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Abstract

一种过流故障保护电路，对母线回路中的电能参数进行检测，并能在根据电能参数判定母线回路中的电流值大于预设阈值时控制逆变单元停止工作，能够及时发现过流故障并断开母线回路对逆变单元中的可控开关等器件进行保护，降低了成本，而且断开母线回路的方式为控制逆变单元停止工作，无需在母线回路中添加其他器件，节省了成本。一种伺服驱动器，具有如上过流故障保护电路相同的有益效果。

Description

一种伺服驱动器及其过流故障保护电路
本申请要求于2020年02月26日提交至中国专利局、申请号为202010122165.1、发明名称为“一种伺服驱动器及其过流故障保护电路”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及伺服驱动器领域，特别是涉及一种过流故障保护电路，本发明还涉及一种伺服驱动器。
背景技术
伺服驱动器以及变频器都可以对电能进行整流以及逆变处理然后向电机等负载供电，伺服驱动器以及变频器中，逆变单元中的可控开关等器件的电流承受能力是有限的，若因为负载接线错误或者逆变单元中器件损坏等原因导致伺服驱动器或者变频器中母线回路中的电流过大，很可能会对逆变单元中的可控开关等器件造成损坏，然而现有技术中没有一种过流故障保护电路能够及时发现母线回路中的过流现象并进行相应保护，很可能造成可控开关等器件的损坏，增加了成本。
因此，如何提供一种解决上述技术问题的方案是本领域技术人员目前需要解决的问题。
发明内容
本发明的目的是提供一种过流故障保护电路，能够及时发现过流故障并断开母线回路对逆变单元中的可控开关等器件进行保护，降低了成本；本发明的另一目的是提供一种包括上述过流故障保护电路的伺服驱动器，能够及时发现过流故障并断开母线回路对逆变单元中的可控开关等器件进行保护，降低了成本。
为解决上述技术问题，本发明提供了一种过流故障保护电路，包括：
设置于母线回路中的电能参数检测模块，用于检测所述母线回路中预设类型的电能参数；
分别与所述电能参数检测模块以及所述母线回路中的逆变单元连接的处理装置，用于在根据所述电能参数判定所述母线回路中的电流值大于预设阈值时，控制所述逆变单元停止工作。
优选地，所述处理装置包括：
与所述电能参数检测模块连接的第一比较电路，用于在根据所述电能参数判定所述母线回路中的电流值大于第一预设子阈值时生成第一触发信号；
与所述电能参数检测模块连接的第二比较电路，用于在根据所述电能参数判定所述母线回路中的电流值大于第二预设子阈值时生成第二触发信号；
分别与所述第一比较电路以及所述第二比较电路连接的处理器，用于在上电后的预设时段内接收到所述第一触发信号时控制所述逆变单元停止工作并控制提示器提示对地短路故障；在上电后的预设时段后接收到所述第二触发信号时控制所述逆变单元停止工作并控制所述提示器提示过流故障；
则该过流故障保护电路还包括：
与所述处理器连接的提示器。
优选地，所述电能参数检测模块包括：
串接于所述母线回路中的分压电阻，用于分得所述母线回路中预设数值的电压值。
优选地，所述第一比较电路包括：
与所述分压电阻连接的第一运算放大器，用于将所述电压值放大预设比例；
分别与所述第一运算放大器以及所述处理器连接的第一比较器，用于在放大预设比例后的所述电压值大于基准电压值时控制第一触发开关导通；
控制端与所述第一比较器连接，第一端分别与上拉电源模块以及所述处理器连接，第二端接地的第一触发开关，用于在导通时控制所述处理器接收到低电平；
所述第二比较电路包括：
与所述分压电阻连接的第二运算放大器，用于将所述电压值放大预设比例；
分别与所述第二运算放大器以及所述处理器连接的第二比较器，用于在放大预设比例后的所述电压值大于基准电压值时控制第二触发开关导通；
控制端与所述第二比较器连接，第一端分别与所述上拉电源模块以及所述处理器连接，第二端接地的第二触发开关，用于在导通时控制所述处理器接收到低电平；
则该处理装置还包括：
所述上拉电源模块，用于为在所述第一触发开关或所述第二触发开关断开时将所述处理器的检测端上拉为高电平；
分别与所述第一比较器以及所述第二比较器连接的基准电压模块，用于为所述第一比较器以及所述第二比较器提供所述基准电压值；
其中，所述第一触发信号以及所述第二触发信号均为所述低电平。
优选地，所述第一触发开关以及所述第二触发开关均为光电耦合器。
优选地，所述第一运算放大器以及所述第二运算放大器的供电电源均为正负电源。
优选地，所述提示器为显示器和/或报警器。
优选地，所述处理器为现场可编程逻辑门阵列FPGA或ARM处理器。
优选地，该过流故障保护电路还包括：
与所述处理器连接的逆变单元驱动电路，用于在上电后的所述预设时段内控制所述逆变单元中的可控开关以预设频率逐渐导通。
为解决上述技术问题，本发明还提供了一种伺服驱动器，包括如上任一项所述的过流故障保护电路。
本发明提供了一种过流故障保护电路，本申请可以对母线回路中的电能参数进行检测，并能在根据电能参数判定母线回路中的电流值大于预设阈值时控制逆变单元停止工作，能够及时发现过流故障并断开母线回路对逆变单元中的可控开关等器件进行保护，降低了成本，而且断开母线回路 的方式为控制逆变单元停止工作，无需在母线回路中添加其他器件，节省了成本。
本发明还提供了一种伺服驱动器，具有如上过流故障保护电路相同的有益效果。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对现有技术和实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明提供的一种过流故障保护电路的结构示意图；
图2为本发明提供的另一种过流故障保护电路的结构示意图。
具体实施方式
本发明的核心是提供一种过流故障保护电路，能够及时发现过流故障并断开母线回路对逆变单元中的可控开关等器件进行保护，降低了成本；本发明的另一核心是提供一种包括上述过流故障保护电路的伺服驱动器，能够及时发现过流故障并断开母线回路对逆变单元中的可控开关等器件进行保护，降低了成本。
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参考图1，图1为本发明提供的一种过流故障保护电路的结构示意图，包括：
设置于母线回路中的电能参数检测模块1，用于检测母线回路中预设类型的电能参数；
分别与电能参数检测模块1以及母线回路中的逆变单元连接的处理装置2，用于在根据电能参数判定母线回路中的电流值大于预设阈值时，控制逆变单元停止工作。
具体的，考虑到在负载接线错误、逆变单元中器件损坏或者高惯量零速停机等情况下，伺服驱动器或者变频器中母线回路中的电流可能会过大，该电流值可能超出逆变单元中的可控开关或者母线回路中其他器件的工作范围，会对器件造成损坏，本发明实施例中的电能参数检测模块1首先可以对母线回路中预设类型的电能参数进行检测，处理装置2可以根据电能参数判断母线回路中的电流值是否大于预设阈值，一旦大于，则此时母线回路不适宜继续通电，可能会对相关器件造成损坏，增加维修成本，因此处理装置2可以在母线回路中的电流值大于预设阈值时控制逆变单元停止工作，使得母线回路断开，保证了可控开关等其他器件的安全。
其中，预设类型可以为多种类型，例如可以为电流或者电压等，本发明实施例在此不做限定。
具体的，由于逆变单元为母线回路中原有的器件，因此通过控制逆变单元停止工作的方式使母线回路断开，可以无需额外添加器件，节省了成本。
当然，除了控制逆变单元停止工作的方式外，控制母线回路断开的方式还可以为其他多种类型，本发明实施例在此不做限定。
本发明提供了一种过流故障保护电路，本申请可以对母线回路中的电能参数进行检测，并能在根据电能参数判定母线回路中的电流值大于预设阈值时控制逆变单元停止工作，能够及时发现过流故障并断开母线回路对逆变单元中的可控开关等器件进行保护，降低了成本，而且断开母线回路的方式为控制逆变单元停止工作，无需在母线回路中添加其他器件，节省了成本。
在上述实施例的基础上：
为了更好地对本发明实施例进行说明，请参考图2，图2为本发明提供的另一种过流故障保护电路的结构示意图，作为一种优选的实施例，处理装置2包括：
与电能参数检测模块1连接的第一比较电路21，用于在根据电能参数判定母线回路中的电流值大于第一预设子阈值时生成第一触发信号；
与电能参数检测模块1连接的第二比较电路22，用于在根据电能参数判定母线回路中的电流值大于第二预设子阈值时生成第二触发信号；
分别与第一比较电路21以及第二比较电路22连接的处理器，用于在上电后的预设时段内接收到第一触发信号时控制逆变单元停止工作并控制提示器提示对地短路故障；在上电后的预设时段后接收到第二触发信号时控制逆变单元停止工作并控制提示器提示过流故障；
则该过流故障保护电路还包括：
与处理器连接的提示器。
具体的，由于本申请考虑到过流故障通常可以分为两种，一种是由于器件故障等原因导致母线回路直通短路，此种情况下由于母线回路中的阻抗较小，此时产生的故障电流通常较大，例如超过100A等，但是若由于负载接线错误等原因导致电机输出端对地短路，由于此种情况下母线回路中的阻抗稍大于器件故障时母线回路中的阻抗，因此此种情况下的故障电流通常小于上述第一种情况中的故障电流，例如为18A等(通常小于20A)，因此如何准确地对两种故障电流不同的故障情况进行区分检测是一个难点；区别于器件故障导致的内部短路，由于接线错误导致的对地短路故障在母线回路刚上电的时候便存在，本发明实施例中可以在上电后的预设时段内判断第一比较电路21是否生成第一触发信号，若生成第一触发信号则代表刚上电时母线回路中的电流值便已经超过第一预设阈值，也即可能存在负载接线错误等情况引起的对地短路，此时可以通过提示器提示对地短路故障；另一方面，在上电后的的预设时段后(当然也可以在上电后的任意时间区间内)，第二比较电路22均可以在判定母线回路中的电流值大于第二预设阈值时生成第二触发信号，处理器可以在接收到第二触发信号时判定母线回路中存在过流故障，并控制提示器进行提示。
具体的，通过上述分析可以直观的看出，本申请中可以准确地对负载接线错误导致的的对地短路故障以及由于器件损坏产生的故障电流进行区分，并将大致的故障类型(对地短路故障/由于器件损坏导致的过流故障)进行提示，可以给工作人员以指导，便于工作人员进行检修工作，提高了工作效率。
其中，第一预设阈值以及第二预设阈值均可以根据具体情况进行自主设定，通常情况下第一预设阈值小于第二预设阈值，本发明实施例在此不做限定。
具体的，预设时段可以进行自主设定，例如可以为10ms等，本发明实施例在此不做限定。
其中，在图2中，TZ-G信号可作为第一触发信号，TZ信号可作为第二触发信号，本发明实施例在此不做限定。
作为一种优选的实施例，电能参数检测模块1包括：
串接于母线回路中的分压电阻R233，用于分得母线回路中预设数值的电压值。
具体的，电压值具有易采集的特点，便于电压采集电路的设计。
当然，除了电压值外，电能参数还可以为电流等，本发明实施例在此不做限定。
具体的，分压电阻R233具有体积小、成本低以及寿命长等优点。
其中，分压电阻R233可选用毫欧级电阻，其可以得到毫伏级的采样电压。
当然，除了分压电阻R233外，电能参数检测模块1还可以为其他类型，本发明实施例在此不做限定。
作为一种优选的实施例，第一比较电路21包括：
与分压电阻R233连接的第一运算放大器，用于将电压值放大预设比例；
分别与第一运算放大器以及处理器连接的第一比较器，用于在放大预设比例后的电压值大于基准电压值时控制第一触发开关导通；
控制端与第一比较器连接，第一端分别与上拉电源模块以及处理器连接，第二端接地的第一触发开关，用于在导通时控制处理器接收到低电平；
第二比较电路22包括：
与分压电阻R233连接的第二运算放大器，用于将电压值放大预设比例；
分别与第二运算放大器以及处理器连接的第二比较器，用于在放大预设比例后的电压值大于基准电压值时控制第二触发开关导通；
控制端与第二比较器连接，第一端分别与上拉电源模块以及处理器连接，第二端接地的第二触发开关，用于在导通时控制处理器接收到低电平；
则该处理装置2还包括：
上拉电源模块，用于为在第一触发开关或第二触发开关断开时将处理器的检测端上拉为高电平；
分别与第一比较器以及第二比较器连接的基准电压模块，用于为第一比较器以及第二比较器提供基准电压值；
其中，第一触发信号以及第二触发信号均为低电平。
具体的，第一比较电路21以及第二比较电路22具有相似的结构，其中的第一运算放大器以及第二运算放大器均能对采集到的电压值进行放大以便后续的比较，通过对电压值放大不同的比例，便可以通过相应的第一比较器或者第二比较器判定母线回路中的电流值是否大于相应的预设阈值，例如在基准电压相同的情况下，在第一比较电路21中，预设比例可以设置为10倍，当放大10倍后的电压值大于预设阈值时便可以生成第一触发信号，而在第二比较电路22中，预设比例可以设置为8倍，当放大8倍后的电压值大于预设阈值时才可以生成第二触发信号，这种预设比例的设置方法显然需要第二比较电路22在采样得到的电压值更高的情况下才能够生成第二触发信号，第一比较电路21在采样得到的电压值并不是特别高的情况下就能够生成第一触发信号，也即第二比较回路能够判定电流值是否高于第二预设阈值，而第一比较回路能够判定电流值是否高于第一预设阈值。
具体的，本发明实施例中的第一触发信号以及第二触发信号均为低电平，当然，第一触发信号和/或第二触发信号还可以设置为高电平，本发明实施例在此不做限定。
具体的，基准电压值具体可以进行自主设定，本发明实施例在此不做限定。
当然，除了本发明实施例提供的第一比较电路21以及第二比较电路22的具体形式外，第一比较电路21以及第二比较电路22还可以为其他具体类型，本发明实施例在此不做限定。
其中，在图2中，第一运算放大器可以包括第一运算放大器本体U33-A及其外围电路，第二运算放大器可以包括第二运算放大器本体U33-B及其外围电路，其中，第一运算放大器本体U33-A的外围电路包括第一比例电阻R7以及R227、第一滤波电容C206、第一阻抗匹配电阻R176以及第一接地电阻R178，第二运算放大器本体U33-B的外围电路包括第二比例电阻R191以及R183、第二滤波电容C248、第二阻抗匹配电阻R209以及第二接地电阻R217.作为一种优选的实施例，第一触发开关以及第二触发开关均为光电耦合器。
其中，在图2中，基准电压模块可以包括+15V直流电压源、第三比例电阻R179、R131以及线性电压调整器U27，上拉电源模块包括+3.3V直流电压源、上拉电阻R220以及R223。
当然，除了上述的具体电路组成外，上述电路的电路组成还可以为其他多种形式，本发明实施例在此不做限定。
具体的，光电耦合器具有强弱电隔离、体积小以及寿命长等优点。
当然，除了光电耦合器外，第一触发开关以及第二触发开关均还可以为其他多种类型，本发明实施例在此不做限定。
作为一种优选的实施例，第一运算放大器以及第二运算放大器的供电电源均为正负电源。
具体的，正负电源可以防止电路中的反向浪涌电流对第一运算放大器以及第二运算放大器的影响，从而提高比较器工作的可靠性。
当然，除了正负电源外，第一运算放大器以及第二运算放大器的供电电源还可以为其他类型，本发明实施例在此不做限定。
作为一种优选的实施例，提示器为显示器和/或报警器。
具体的，显示器具有提示效果直观、寿命长以及体积小等优点，报警器具有体积小、成本低以及提示效果强等优点。
当然，除了显示器和/或报警器外，提示器还可以为其他多种类型，本发明实施例在此不做限定。
作为一种优选的实施例，处理器为FPGA(Field Programmable Gate Array，现场可编程逻辑门阵列)或ARM处理器。
具体的，FPGA以及ARM处理器均有处理速度快、体积小以及成本低等优点。
当然，除了FPGA以及ARM处理器外，处理器还可以为其他多种类型，本发明实施例在此不做限定。
作为一种优选的实施例，该过流故障保护电路还包括：
与处理器连接的逆变单元驱动电路，用于在上电后的预设时段内控制逆变单元中的可控开关以预设频率逐渐导通。
具体的，考虑到若母线回路上电时存在负载对地短路故障，此时若直接开通逆变单元中的可控开关则可能导致母线回路中的电流过大并且有可能对相关器件造成损坏，本申请中可以通过控制可控开关在预设时段内以预设频率逐渐导通的方式限制母线回路中电流的激增，而是以缓慢的方式增长，并且结合上述方案可以在此过程中对母线回路中的电流值进行判定，并在判定存在对地短路故障时立即控制可控开关关断，从而进一步提高了可控开关等相关期间的安全性。
具体的，控制可控开关逐渐导通具体的可以为控制逆变单元中的下桥IGBT(Insulated Gate Bipolar Transistor，绝缘栅双极型晶体管)按照预设频率逐渐导通等，本发明实施例在此不做限定。
其中，预设频率可以进行自主设定，本发明实施例在此不做限定。
为解决上述技术问题，本发明还提供了一种伺服驱动器，包括前述实施例中的过流故障保护电路。
对于本发明实施例中伺服驱动器的介绍请参照前述的过流故障保护电路的实施例，本发明实施例在此不再赘述。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。
还需要说明的是，在本说明书中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个......”限定的要素，并不排除在包括该要素的过程、方法、物品或者设备中还存在另外的相同要素。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其他实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (10)

  1. 一种过流故障保护电路，其特征在于，包括：
    设置于母线回路中的电能参数检测模块，用于检测所述母线回路中预设类型的电能参数；
    分别与所述电能参数检测模块以及所述母线回路中的逆变单元连接的处理装置，用于在根据所述电能参数判定所述母线回路中的电流值大于预设阈值时，控制所述逆变单元停止工作。
  2. 根据权利要求1所述的过流故障保护电路，其特征在于，所述处理装置包括：
    与所述电能参数检测模块连接的第一比较电路，用于在根据所述电能参数判定所述母线回路中的电流值大于第一预设子阈值时生成第一触发信号；
    与所述电能参数检测模块连接的第二比较电路，用于在根据所述电能参数判定所述母线回路中的电流值大于第二预设子阈值时生成第二触发信号；
    分别与所述第一比较电路以及所述第二比较电路连接的处理器，用于在上电后的预设时段内接收到所述第一触发信号时控制所述逆变单元停止工作并控制提示器提示对地短路故障；在上电后的预设时段后接收到所述第二触发信号时控制所述逆变单元停止工作并控制所述提示器提示过流故障；
    则该过流故障保护电路还包括：
    与所述处理器连接的提示器。
  3. 根据权利要求2所述的过流故障保护电路，其特征在于，所述电能参数检测模块包括：
    串接于所述母线回路中的分压电阻，用于分得所述母线回路中预设数值的电压值。
  4. 根据权利要求3所述的过流故障保护电路，其特征在于，所述第一比较电路包括：
    与所述分压电阻连接的第一运算放大器，用于将所述电压值放大预设比例；
    分别与所述第一运算放大器以及所述处理器连接的第一比较器，用于在放大预设比例后的所述电压值大于基准电压值时控制第一触发开关导通；
    控制端与所述第一比较器连接，第一端分别与上拉电源模块以及所述处理器连接，第二端接地的第一触发开关，用于在导通时控制所述处理器接收到低电平；
    所述第二比较电路包括：
    与所述分压电阻连接的第二运算放大器，用于将所述电压值放大预设比例；
    分别与所述第二运算放大器以及所述处理器连接的第二比较器，用于在放大预设比例后的所述电压值大于基准电压值时控制第二触发开关导通；
    控制端与所述第二比较器连接，第一端分别与所述上拉电源模块以及所述处理器连接，第二端接地的第二触发开关，用于在导通时控制所述处理器接收到低电平；
    则该处理装置还包括：
    所述上拉电源模块，用于为在所述第一触发开关或所述第二触发开关断开时将所述处理器的检测端上拉为高电平；
    分别与所述第一比较器以及所述第二比较器连接的基准电压模块，用于为所述第一比较器以及所述第二比较器提供所述基准电压值；
    其中，所述第一触发信号以及所述第二触发信号均为所述低电平。
  5. 根据权利要求4所述的过流故障保护电路，其特征在于，所述第一触发开关以及所述第二触发开关均为光电耦合器。
  6. 根据权利要求4所述的过流故障保护电路，其特征在于，所述第一运算放大器以及所述第二运算放大器的供电电源均为正负电源。
  7. 根据权利要求2所述的过流故障保护电路，其特征在于，所述提示器为显示器和/或报警器。
  8. 根据权利要求2所述的过流故障保护电路，其特征在于，所述处理器为现场可编程逻辑门阵列FPGA或ARM处理器。
  9. 根据权利要求2至8任一项所述的过流故障保护电路，其特征在于，该过流故障保护电路还包括：
    与所述处理器连接的逆变单元驱动电路，用于在上电后的所述预设时段内控制所述逆变单元中的可控开关以预设频率逐渐导通。
  10. 一种伺服驱动器，其特征在于，包括如权利要求1至9任一项所述的过流故障保护电路。
PCT/CN2020/078519 2020-02-26 2020-03-10 一种伺服驱动器及其过流故障保护电路 WO2021168906A1 (zh)

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