CN111200277A - Servo driver and overcurrent fault protection circuit thereof - Google Patents
Servo driver and overcurrent fault protection circuit thereof Download PDFInfo
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- CN111200277A CN111200277A CN202010122165.1A CN202010122165A CN111200277A CN 111200277 A CN111200277 A CN 111200277A CN 202010122165 A CN202010122165 A CN 202010122165A CN 111200277 A CN111200277 A CN 111200277A
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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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Abstract
The invention discloses an overcurrent fault protection circuit which can detect an electric energy parameter in a bus circuit, can control an inversion unit to stop working when judging that a current value in the bus circuit is larger than a preset threshold value according to the electric energy parameter, can timely find an overcurrent fault and disconnect the bus circuit to protect devices such as a controllable switch in the inversion unit, and the like, and reduces the cost. The invention also discloses a servo driver which has the same beneficial effects as the overcurrent fault protection circuit.
Description
Technical Field
The invention relates to the field of servo drivers, in particular to an overcurrent fault protection circuit and a servo driver.
Background
The servo driver and the frequency converter can rectify and invert electric energy and then supply power to loads such as a motor and the like, in the servo driver and the frequency converter, the current bearing capacity of devices such as a controllable switch in an inversion unit is limited, if the current in a bus loop in the servo driver or the frequency converter is overlarge due to reasons such as wrong wiring of the load or damage of the devices in the inversion unit, the devices such as the controllable switch in the inversion unit are likely to be damaged, however, no overcurrent fault protection circuit in the prior art can find the overcurrent phenomenon in the bus loop in time and carry out corresponding protection, the damage of the devices such as the controllable switch is likely to be caused, and the cost is increased.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an overcurrent fault protection circuit which can find overcurrent faults in time and disconnect a bus loop to protect devices such as a controllable switch in an inverter unit and the like, so that the cost is reduced; another object of the present invention is to provide a servo driver including the above overcurrent fault protection circuit, which can timely find an overcurrent fault and disconnect a bus loop to protect devices such as a controllable switch in an inverter unit, thereby reducing cost.
In order to solve the above technical problem, the present invention provides an overcurrent fault protection circuit, including:
the electric energy parameter detection module is arranged in the bus circuit and is used for detecting electric energy parameters of preset types in the bus circuit;
and the processing device is respectively connected with the electric energy parameter detection module and the inversion unit in the bus circuit and is used for controlling the inversion unit to stop working when the current value in the bus circuit is judged to be larger than a preset threshold value according to the electric energy parameter.
Preferably, the processing means comprises:
the first comparison circuit is connected with the electric energy parameter detection module and is used for generating a first trigger signal when the current value in the bus circuit is judged to be larger than a first preset sub-threshold value according to the electric energy parameter;
the second comparison circuit is connected with the electric energy parameter detection module and is used for generating a second trigger signal when the current value in the bus circuit is judged to be larger than a second preset sub-threshold value according to the electric energy parameter;
the processor is respectively connected with the first comparison circuit and the second comparison circuit and is used for controlling the inversion unit to stop working and controlling the prompter to prompt ground short circuit fault when receiving the first trigger signal in a preset time period after power-on; when the second trigger signal is received after the preset time period after power-on, the inversion unit is controlled to stop working, and the prompter is controlled to prompt overcurrent faults;
the over-current fault protection circuit further comprises:
and the prompter is connected with the processor.
Preferably, the power parameter detection module includes:
and the voltage dividing resistor is connected in series with the bus loop and is used for dividing a voltage value of a preset numerical value in the bus loop.
Preferably, the first comparison circuit includes:
the first operational amplifier is connected with the divider resistor and is used for amplifying the voltage value by a preset proportion:
the first comparator is respectively connected with the first operational amplifier and the processor and is used for controlling the first trigger switch to be conducted when the voltage value after the preset proportion is amplified is greater than a reference voltage value;
the control end is connected with the first comparator, the first end is respectively connected with the pull-up power module and the processor, and the second end of the first trigger switch is grounded and used for controlling the processor to receive a low level when the first trigger switch is conducted;
the second comparison circuit includes:
the second operational amplifier is connected with the divider resistor and is used for amplifying the voltage value by a preset proportion;
the second comparator is respectively connected with the second operational amplifier and the processor and is used for controlling the conduction of a second trigger switch when the voltage value after the amplification of the preset proportion is greater than the reference voltage value;
the control end is connected with the second comparator, the first end is respectively connected with the pull-up power module and the processor, and the second trigger switch with the grounded second end is used for controlling the processor to receive low level when the processor is conducted;
the processing apparatus further comprises:
the pull-up power module is used for pulling up the detection end of the processor to a high level when the first trigger switch or the second trigger switch is switched off;
a reference voltage module connected to the first comparator and the second comparator, respectively, for providing the reference voltage value to the first comparator and the second comparator;
wherein the first trigger signal and the second trigger signal are both at the low level.
Preferably, the first trigger switch and the second trigger switch are both photocouplers.
Preferably, the power supply sources of the first operational amplifier and the second operational amplifier are both positive and negative power sources.
Preferably, the prompting device is a display and/or an alarm.
Preferably, the processor is a Field Programmable Gate Array (FPGA) or an ARM processor.
Preferably, the overcurrent fault protection circuit further includes:
and the inverter unit driving circuit is connected with the processor and is used for controlling the controllable switch in the inverter unit to be gradually conducted at a preset frequency in the preset time period after the inverter unit is powered on.
In order to solve the technical problem, the invention further provides a servo driver, which comprises the overcurrent fault protection circuit.
The invention provides an overcurrent fault protection circuit, which can detect an electric energy parameter in a bus circuit, can control an inversion unit to stop working when judging that a current value in the bus circuit is larger than a preset threshold value according to the electric energy parameter, can timely find an overcurrent fault and disconnect the bus circuit to protect devices such as a controllable switch in the inversion unit, and the like, and reduces the cost.
The invention also provides a servo driver which has the same beneficial effects as the overcurrent fault protection circuit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an overcurrent fault protection circuit according to the present invention;
fig. 2 is a schematic structural diagram of another overcurrent fault protection circuit provided by the present invention.
Detailed Description
The core of the invention is to provide an overcurrent fault protection circuit which can find overcurrent faults in time and disconnect a bus loop to protect devices such as a controllable switch in an inverter unit and the like, thereby reducing the cost; the other core of the invention is to provide the servo driver comprising the overcurrent fault protection circuit, which can find overcurrent faults in time and disconnect a bus loop to protect devices such as a controllable switch in an inverter unit, and the like, thereby reducing the cost.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an overcurrent fault protection circuit provided in the present invention, including:
the electric energy parameter detection module 1 is arranged in the bus circuit and is used for detecting preset type electric energy parameters in the bus circuit;
and the processing device 2 is respectively connected with the electric energy parameter detection module 1 and the inversion unit in the bus circuit and is used for controlling the inversion unit to stop working when the current value in the bus circuit is judged to be larger than the preset threshold value according to the electric energy parameter.
Specifically, considering that under the conditions of a load wiring error, a device in an inverter unit being damaged or a high-inertia zero-speed shutdown, etc., the current in a bus loop in a servo driver or a frequency converter may be too large, and the current value may exceed the working range of a controllable switch in the inverter unit or other devices in the bus loop, which may damage the devices, the electric energy parameter detection module 1 in the embodiment of the present invention may first detect a preset type of electric energy parameter in the bus loop, the processing device 2 may determine whether the current value in the bus loop is greater than a preset threshold value according to the electric energy parameter, and once the current value is greater than the preset threshold value, the bus loop is not suitable for being continuously powered on at this time, which may damage related devices, and increase the maintenance cost, so the processing device 2 may control the inverter unit to stop working when the current value in the bus loop is greater than the, the bus loop is disconnected, and the safety of other devices such as a controllable switch and the like is ensured.
The preset type may be multiple types, for example, the preset type may be a current or a voltage, and the embodiment of the present invention is not limited herein.
Specifically, because the inverter unit is an original device in the bus circuit, the bus circuit is disconnected by controlling the inverter unit to stop working, so that additional devices are not required, and the cost is saved.
Of course, besides the manner of controlling the inverter unit to stop working, the manner of controlling the bus circuit to be disconnected may be of other various types, and the embodiment of the present invention is not limited herein.
The invention provides an overcurrent fault protection circuit, which can detect an electric energy parameter in a bus circuit, can control an inversion unit to stop working when judging that a current value in the bus circuit is larger than a preset threshold value according to the electric energy parameter, can timely find an overcurrent fault and disconnect the bus circuit to protect devices such as a controllable switch in the inversion unit, and the like, and reduces the cost.
On the basis of the above-described embodiment:
for better explaining the embodiment of the present invention, please refer to fig. 2, fig. 2 is a schematic structural diagram of another over-current fault protection circuit provided by the present invention, and as a preferred embodiment, the processing device 2 includes:
the first comparison circuit 21 is connected with the electric energy parameter detection module 1 and is used for generating a first trigger signal when the current value in the bus circuit is judged to be greater than a first preset sub-threshold value according to the electric energy parameter;
the second comparison circuit 22 is connected with the electric energy parameter detection module 1 and is used for generating a second trigger signal when the current value in the bus circuit is judged to be greater than a second preset sub-threshold value according to the electric energy parameter;
the processor is respectively connected with the first comparison circuit 21 and the second comparison circuit 22 and is used for controlling the inversion unit to stop working and controlling the prompter to prompt the ground short circuit fault when receiving the first trigger signal in a preset time period after being electrified; when a second trigger signal is received after a preset time period after power-on, the inverter unit is controlled to stop working and the prompter is controlled to prompt an overcurrent fault;
the over-current fault protection circuit further comprises:
and the prompter is connected with the processor.
Specifically, in the present application, it is considered that an overcurrent fault can be generally divided into two types, one is a bus circuit through short circuit due to a device fault and the like, in this case, because impedance in the bus circuit is small, a fault current generated at this time is generally large, for example, exceeding 100A and the like, but if an output end of a motor is short-circuited to ground due to a load wiring error and the like, because impedance in the bus circuit in this case is slightly larger than impedance in the bus circuit when the device fault occurs, a fault current in this case is generally smaller than a fault current in the first case, for example, 18A and the like (generally smaller than 20A), and therefore, it is a difficult point how to accurately distinguish and detect two fault cases with different fault currents; the method is characterized in that an internal short circuit caused by a device fault exists when a bus circuit is just electrified due to a ground short circuit fault caused by a wiring error, whether a first trigger signal is generated by a first comparison circuit 21 can be judged within a preset time period after the bus circuit is electrified, if the first trigger signal is generated, the first trigger signal represents that a current value in the bus circuit exceeds a first preset threshold value when the bus circuit is just electrified, namely, a ground short circuit caused by the conditions of a load wiring error and the like possibly exists, and at the moment, the ground short circuit fault can be prompted by a prompter; on the other hand, after a preset time period after power-on (or within any time interval after power-on), the second comparing circuit 22 may generate a second trigger signal when determining that the current value in the bus circuit is greater than the second preset threshold, and the processor may determine that an overcurrent fault exists in the bus circuit when receiving the second trigger signal, and control the prompter to prompt.
Specifically, the analysis can visually see that the ground short circuit fault caused by the load wiring error and the fault current caused by the device damage can be accurately distinguished, the rough fault type (the ground short circuit fault/the overcurrent fault caused by the device damage) is prompted, guidance can be given to a worker, the worker can conveniently overhaul, and the working efficiency is improved.
The first preset threshold and the second preset threshold may be set autonomously according to specific situations, and the first preset threshold is smaller than the second preset threshold in a normal situation.
Specifically, the preset time period may be set autonomously, for example, may be 10ms, and the embodiment of the present invention is not limited herein.
In fig. 2, the TZ-G signal may be used as a first trigger signal, and the TZ signal may be used as a second trigger signal.
As a preferred embodiment, the power parameter detection module 1 includes:
and the voltage dividing resistor R233 is connected in series with the bus loop and is used for dividing a voltage value of a preset numerical value in the bus loop.
Specifically, the voltage value has the characteristic of easy collection, and the design of a voltage collection circuit is convenient.
Of course, the electric energy parameter may be a current or the like in addition to the voltage value, and the embodiment of the present invention is not limited herein.
Specifically, the voltage dividing resistor R233 has advantages of small size, low cost, long life, and the like.
The voltage dividing resistor R233 may be a milliohm resistor, which may obtain a millivolt sampling voltage.
Of course, the power parameter detection module 1 may be of other types besides the voltage dividing resistor R233, and the embodiment of the invention is not limited herein.
As a preferred embodiment, the first comparison circuit 21 includes:
the first operational amplifier is connected with the voltage dividing resistor R233 and is used for amplifying the voltage value by a preset proportion;
the first comparator is respectively connected with the first operational amplifier and the processor and is used for controlling the first trigger switch to be conducted when the voltage value after the preset proportion is amplified is greater than the reference voltage value;
the control end is connected with the first comparator, the first end is respectively connected with the pull-up power module and the processor, and the second end of the first trigger switch is grounded and used for controlling the processor to receive a low level when the first trigger switch is conducted;
the second comparison circuit 22 includes:
the second operational amplifier is connected with the voltage dividing resistor R233 and is used for amplifying the voltage value by a preset proportion;
the second comparator is respectively connected with the second operational amplifier and the processor and is used for controlling the conduction of the second trigger switch when the voltage value after the preset proportion is amplified is greater than the reference voltage value;
the control end is connected with the second comparator, the first end is respectively connected with the pull-up power module and the processor, and the second trigger switch with the grounded second end is used for controlling the processor to receive a low level when the processor is conducted;
the processing means 2 further comprise:
the pull-up power module is used for pulling up the detection end of the processor to a high level when the first trigger switch or the second trigger switch is switched off;
the reference voltage module is respectively connected with the first comparator and the second comparator and is used for providing reference voltage values for the first comparator and the second comparator;
the first trigger signal and the second trigger signal are both at a low level.
Specifically, the first comparison circuit 21 and the second comparison circuit 22 have similar structures, wherein the first operational amplifier and the second operational amplifier can amplify the acquired voltage value for subsequent comparison, and can determine whether the current value in the bus circuit is greater than a corresponding preset threshold value through the corresponding first comparator or the second comparator by amplifying the voltage value by different proportions, for example, under the condition that the reference voltages are the same, the preset proportion may be set to 10 times in the first comparison circuit 21, the first trigger signal may be generated when the voltage value amplified by 10 times is greater than the preset threshold value, the preset proportion may be set to 8 times in the second comparison circuit 22, and the second trigger signal may be generated only when the voltage value amplified by 8 times is greater than the preset threshold value, which obviously requires the second comparison circuit 22 to generate the second trigger signal under the condition that the sampled voltage value is higher The first comparison circuit 21 is able to generate the first trigger signal in the case that the sampled voltage value is not particularly high, i.e. the second comparison loop is able to determine whether the current value is higher than the second preset threshold, while the first comparison loop is able to determine whether the current value is higher than the first preset threshold.
Specifically, in the embodiment of the present invention, both the first trigger signal and the second trigger signal are at a low level, and certainly, the first trigger signal and/or the second trigger signal may also be set to a high level.
Specifically, the reference voltage value may be set autonomously, and the embodiment of the present invention is not limited herein.
Of course, in addition to the specific forms of the first comparison circuit 21 and the second comparison circuit 22 provided in the embodiment of the present invention, the first comparison circuit 21 and the second comparison circuit 22 may be of other specific types, and the embodiment of the present invention is not limited herein.
In fig. 2, the first operational amplifier may include a first operational amplifier body U33-a and its peripheral circuits, and the second operational amplifier may include a second operational amplifier body U33-B and its peripheral circuits, wherein the peripheral circuits of the first operational amplifier body U33-a include first proportional resistors R7 and R227, a first filter capacitor C206, a first impedance matching resistor R176 and a first ground resistor R178, and the peripheral circuits of the second operational amplifier body U33-B include second proportional resistors R191 and R183, a second filter capacitor C248, a second impedance matching resistor R209 and a second ground resistor R217.
In fig. 2, the reference voltage module may include a +15V dc voltage source, third proportional resistors R179 and 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.
Of course, besides the above specific circuit components, the circuit components of the above circuits may also be in other various forms, and the embodiments of the present invention are not limited herein.
Specifically, the photoelectric coupler has the advantages of strong and weak electric isolation, small volume, long service life and the like.
Of course, the first trigger switch and the second trigger switch may be of other types besides the photocoupler, and the embodiment of the present invention is not limited herein.
In a preferred embodiment, the power supply sources of the first operational amplifier and the second operational amplifier are both positive and negative power sources.
Specifically, the positive power supply and the negative power supply can prevent reverse surge current in the circuit from influencing the first operational amplifier and the second operational amplifier, so that the working reliability of the comparator is improved.
Of course, the power supply of the first operational amplifier and the power supply of the second operational amplifier may be other types besides the positive power supply and the negative power supply, and the embodiment of the invention is not limited herein.
In a preferred embodiment, the prompting device is a display and/or an alarm.
Specifically, the display has the advantages of visual prompt effect, long service life, small size and the like, and the alarm has the advantages of small size, low cost, strong prompt effect and the like.
Of course, besides the display and/or the alarm, the prompter may be of other various types, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the processor is an FPGA (Field Programmable Gate Array) or an ARM processor.
Specifically, the FPGA and the ARM processor have the advantages of high processing speed, small size, low cost and the like.
Of course, the processor may be of various types other than the FPGA and the ARM processor, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the overcurrent fault protection circuit further includes:
and the inversion unit driving circuit is connected with the processor and is used for controlling the controllable switches in the inversion units to be gradually conducted at a preset frequency in a preset time period after the inversion units are electrified.
Specifically, considering that if a load short-circuit to ground fault exists when the bus circuit is powered on, at this time, if the controllable switch in the inverter unit is directly turned on, the current in the bus circuit may be too large and the related devices may be damaged, in the present application, the current in the bus circuit may be limited to increase in a slow manner by controlling the controllable switch to gradually turn on at a preset frequency within a preset time period, and in combination with the above scheme, the current value in the bus circuit may be determined in the process, and the controllable switch is immediately controlled to turn off when the short-circuit to ground fault exists, so that the safety of the controllable switch and the like during the related period is further improved.
Specifically, the controlling the controllable switch to be gradually turned on may be specifically controlling a lower bridge IGBT (Insulated Gate Bipolar Transistor) in the inverter unit to be gradually turned on according to a preset frequency, and the like, and the embodiment of the present invention is not limited herein.
The preset frequency may be set autonomously, and the embodiment of the present invention is not limited herein.
In order to solve the above technical problem, the present invention further provides a servo driver, including the overcurrent fault protection circuit in the foregoing embodiment.
For the description of the servo driver in the embodiment of the present invention, reference is made to the above-mentioned embodiment of the over-current fault protection circuit, and the embodiment of the present invention is not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An overcurrent fault protection circuit, comprising:
the electric energy parameter detection module is arranged in the bus circuit and is used for detecting electric energy parameters of preset types in the bus circuit;
and the processing device is respectively connected with the electric energy parameter detection module and the inversion unit in the bus circuit and is used for controlling the inversion unit to stop working when the current value in the bus circuit is judged to be larger than a preset threshold value according to the electric energy parameter.
2. The overcurrent fault protection circuit of claim 1 wherein the processing means comprises:
the first comparison circuit is connected with the electric energy parameter detection module and is used for generating a first trigger signal when the current value in the bus circuit is judged to be larger than a first preset sub-threshold value according to the electric energy parameter;
the second comparison circuit is connected with the electric energy parameter detection module and is used for generating a second trigger signal when the current value in the bus circuit is judged to be larger than a second preset sub-threshold value according to the electric energy parameter;
the processor is respectively connected with the first comparison circuit and the second comparison circuit and is used for controlling the inversion unit to stop working and controlling the prompter to prompt ground short circuit fault when receiving the first trigger signal in a preset time period after power-on; when the second trigger signal is received after the preset time period after power-on, the inversion unit is controlled to stop working, and the prompter is controlled to prompt overcurrent faults;
the over-current fault protection circuit further comprises:
and the prompter is connected with the processor.
3. The overcurrent fault protection circuit of claim 2 wherein the power parameter detection module comprises:
and the voltage dividing resistor is connected in series with the bus loop and is used for dividing a voltage value of a preset numerical value in the bus loop.
4. The overcurrent fault protection circuit of claim 3 wherein the first comparison circuit comprises:
the first operational amplifier is connected with the divider resistor and is used for amplifying the voltage value by a preset proportion;
the first comparator is respectively connected with the first operational amplifier and the processor and is used for controlling the first trigger switch to be conducted when the voltage value after the preset proportion is amplified is greater than a reference voltage value;
the control end is connected with the first comparator, the first end is respectively connected with the pull-up power module and the processor, and the second end of the first trigger switch is grounded and used for controlling the processor to receive a low level when the first trigger switch is conducted;
the second comparison circuit includes:
the second operational amplifier is connected with the divider resistor and is used for amplifying the voltage value by a preset proportion;
the second comparator is respectively connected with the second operational amplifier and the processor and is used for controlling the conduction of a second trigger switch when the voltage value after the amplification of the preset proportion is greater than the reference voltage value;
the control end is connected with the second comparator, the first end is respectively connected with the pull-up power module and the processor, and the second trigger switch with the grounded second end is used for controlling the processor to receive low level when the processor is conducted;
the processing apparatus further comprises:
the pull-up power module is used for pulling up the detection end of the processor to a high level when the first trigger switch or the second trigger switch is switched off;
a reference voltage module connected to the first comparator and the second comparator, respectively, for providing the reference voltage value to the first comparator and the second comparator;
wherein the first trigger signal and the second trigger signal are both at the low level.
5. The overcurrent fault protection circuit of claim 4, wherein the first trigger switch and the second trigger switch are both opto-couplers.
6. The overcurrent fault protection circuit of claim 4, wherein the power supplies of the first operational amplifier and the second operational amplifier are both positive and negative power supplies.
7. The overcurrent fault protection circuit of claim 2 wherein the indicator is a display and/or an alarm.
8. The overcurrent fault protection circuit of claim 2 wherein the processor is a Field Programmable Gate Array (FPGA) or an ARM processor.
9. The overcurrent fault protection circuit of any one of claims 2 to 8 further comprising:
and the inverter unit driving circuit is connected with the processor and is used for controlling the controllable switch in the inverter unit to be gradually conducted at a preset frequency in the preset time period after the inverter unit is powered on.
10. A servo driver comprising an overcurrent fault protection circuit as claimed in any one of claims 1 to 9.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010122165.1A CN111200277B (en) | 2020-02-26 | 2020-02-26 | Servo driver and overcurrent fault protection circuit thereof |
| PCT/CN2020/078519 WO2021168906A1 (en) | 2020-02-26 | 2020-03-10 | Servo driver and overcurrent fault protection circuit therefor |
| ZA2021/00347A ZA202100347B (en) | 2020-02-26 | 2021-01-18 | Servo driver and fault protection circuit for overcurrentthereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010122165.1A CN111200277B (en) | 2020-02-26 | 2020-02-26 | Servo driver and overcurrent fault protection circuit thereof |
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| CN111200277A true CN111200277A (en) | 2020-05-26 |
| CN111200277B CN111200277B (en) | 2020-11-10 |
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| CN (1) | CN111200277B (en) |
| WO (1) | WO2021168906A1 (en) |
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| CN115694323B (en) * | 2022-10-11 | 2024-03-22 | 西安电子工程研究所 | Stable tracker locking control method with two-stage overcurrent protection |
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| CN103683893A (en) * | 2014-01-09 | 2014-03-26 | 惠州天能源科技有限公司 | Software protecting method for start short circuit of off-line inverter |
| CN204761001U (en) * | 2015-06-26 | 2015-11-11 | 苏州伟创电气设备技术有限公司 | Servo driver current foldback circuit |
| CN106253206A (en) * | 2014-08-07 | 2016-12-21 | 石狮市酷瑞电气有限责任公司 | The fast short-circuit protective circuit of frequency changer direct current bus and device |
| CN207937803U (en) * | 2017-12-26 | 2018-10-02 | 浙江禾川科技股份有限公司 | A kind of frequency converter slave addresses automatic distribution circuit |
| CN110148925A (en) * | 2019-04-17 | 2019-08-20 | 浙江正泰电器股份有限公司 | For the guard method of motor ground fault and frequency converter in frequency converter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5406146B2 (en) * | 2010-08-31 | 2014-02-05 | 日立オートモティブシステムズ株式会社 | Overcurrent detection device and overcurrent detection method for electric drive control device |
-
2020
- 2020-02-26 CN CN202010122165.1A patent/CN111200277B/en active Active
- 2020-03-10 WO PCT/CN2020/078519 patent/WO2021168906A1/en active Application Filing
-
2021
- 2021-01-18 ZA ZA2021/00347A patent/ZA202100347B/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683893A (en) * | 2014-01-09 | 2014-03-26 | 惠州天能源科技有限公司 | Software protecting method for start short circuit of off-line inverter |
| CN106253206A (en) * | 2014-08-07 | 2016-12-21 | 石狮市酷瑞电气有限责任公司 | The fast short-circuit protective circuit of frequency changer direct current bus and device |
| CN204761001U (en) * | 2015-06-26 | 2015-11-11 | 苏州伟创电气设备技术有限公司 | Servo driver current foldback circuit |
| CN207937803U (en) * | 2017-12-26 | 2018-10-02 | 浙江禾川科技股份有限公司 | A kind of frequency converter slave addresses automatic distribution circuit |
| CN110148925A (en) * | 2019-04-17 | 2019-08-20 | 浙江正泰电器股份有限公司 | For the guard method of motor ground fault and frequency converter in frequency converter |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA202100347B (en) | 2022-07-27 |
| CN111200277B (en) | 2020-11-10 |
| WO2021168906A1 (en) | 2021-09-02 |
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