CN113241729B - Alternating current driver protection circuit - Google Patents
Alternating current driver protection circuit Download PDFInfo
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- CN113241729B CN113241729B CN202110560818.9A CN202110560818A CN113241729B CN 113241729 B CN113241729 B CN 113241729B CN 202110560818 A CN202110560818 A CN 202110560818A CN 113241729 B CN113241729 B CN 113241729B
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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
- H02H7/08—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 dynamo-electric motors
- H02H7/085—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 dynamo-electric motors against excessive load
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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
- H02H7/08—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 dynamo-electric motors
- H02H7/085—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 dynamo-electric motors against excessive load
- H02H7/0855—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 dynamo-electric motors against excessive load avoiding response to transient overloads, e.g. during starting
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Abstract
The application relates to the field of driver control technology, in particular to an alternating current driver protection circuit, which comprises a driving circuit, wherein a braking time detection module, a control module and a switch module are coupled to the driving circuit; the brake time detection module is used for detecting the conduction time of the brake resistor and outputting a brake time signal, the control module is coupled with the brake time detection module and used for receiving the brake time signal and outputting a control signal, the switch module is coupled in a bus loop of the driving circuit and coupled with the control module and used for receiving the control signal to enable the switch module to be switched on or switched off. The application has the advantages that the detection sensitivity is improved, the damage caused by overheating of the brake resistor is reduced, and the working safety of the driver is improved.
Description
Technical Field
The present application relates to the field of driver control technologies, and in particular, to an ac driver protection circuit.
Background
At present, an alternating current driver is one of motor drivers, and plays roles of position control, speed control and torque control in industrial production so as to realize high-precision positioning of a transmission system.
In the related art, as shown in fig. 1, three-phase or single-phase ac power is rectified and then converted into dc power, which is then converted into ac power through an inverter, and the ac power is transmitted to a motor, thereby driving the motor to operate. When the motor runs, acceleration and deceleration processes are carried out, energy generated in deceleration can be fed back to the direct current bus, at the moment, the brake device IGBT1 is switched on, and then the external brake resistor R2 releases redundant energy, so that the direct current bus device is protected within a normal working range.
However, when the brake device IGBT1 is damaged due to failure, the brake resistor R2 is always in a conducting state, and may generate heat and fire after a long time; when the direct current bus is in a short circuit state due to an abnormal reason, if the relay RLY1 is in a pull-in state, the short circuit is equivalent to an alternating current input short circuit; if relay RLY1 is in the off state, starting resistor R1 is always on, and may generate heat and fire after a long time. In the related technology, no protection is provided or temperature detection protection is set inside the driver, the temperature detection protection needs long reaction time and is not timely enough, and corresponding safety protection measures need to be set for a single device in the driver based on the potential safety hazard.
Disclosure of Invention
In order to improve the sensitivity of driver internal protection, and then reduce the overheated damage that leads to of brake resistor, improve the security of driver work, this application provides an alternating current driver protection circuit.
The application provides an alternating current driver protection circuit, adopts following technical scheme:
an alternating current driver protection circuit comprises a driving circuit, wherein a braking time detection module, a control module and a switch module are coupled to the driving circuit;
the brake time detection module is used for detecting the conduction time of the brake resistor and outputting a brake time signal, the control module is coupled with the brake time detection module and used for receiving the brake time signal and outputting a control signal, the switch module is coupled in a bus loop of the driving circuit and coupled with the control module and used for receiving the control signal to enable the switch module to be switched on or switched off.
By adopting the technical scheme: increase controllable switch module on drive circuit's bus circuit, the braking time detection module of rethread setting, whether can detect braking time in normal standard range, the braking time signal of output is handled by control module centralized, when braking time exceedes standard range, control module output control signal is so that switch module shuts off, it does not have the voltage to enable the bus, compare in the temperature detection protection, need not to wait for the time of intensification, to this, can improve the sensitivity that detects, thereby it leads to the damage to reduce the brake resistance overheat, improve the security of driver work.
Optionally, the braking time detection module includes a conduction detection component, and the conduction detection component is coupled to two ends of the braking resistor, and is configured to detect the conduction time of the braking resistor and output a braking time signal.
By adopting the technical scheme: the conduction detection assembly is in long-term direct connection, can detect the conduction time of the brake resistor, judges whether the conduction time is greater than a preset conduction time upper limit value or not, and if the conduction time is greater than the upper limit value, the control module judges that the brake device fails, timely responds to the control module and outputs a control signal to enable the switch module to be turned off, so that a bus is free of voltage, the brake resistor is prevented from being damaged due to too long conduction time and heating, and the working safety of the driver is improved.
Optionally, the driving circuit is further coupled with a bus short-circuit detection module, the bus short-circuit detection module is configured to detect whether the bus and the power loop are short-circuited and output a bus short-circuit signal, and the control module is coupled with the bus short-circuit detection module and is configured to receive the bus short-circuit signal and output a control signal.
By adopting the technical scheme: when the external motor short circuit or bus short circuit condition takes place, can detect the bus short circuit signal through bus short circuit detection module, then through control module output control signal, and then disconnect switch module, enable the bus voltage-free, further improved the security of driver work.
Optionally, the driving circuit is further coupled with a start time detection module, the start time detection module is configured to detect start time of the ac driver and output a start time signal, the control module is coupled with the start time detection module and configured to receive the start time signal, and the control module is configured to determine whether the bus voltage is normal and output a control signal.
By adopting the technical scheme: when the parameters of the drive circuit are determined, the starting time of the driver is also determined, the starting time detection module detects the starting time, when the starting time is reached, whether the bus voltage meets the requirements is judged, if the bus voltage does not meet the requirements, the bus voltage is judged to be in a fault state, the control module outputs a turn-off control signal, and the switch module is switched off, so that the protection of the driver is realized.
Optionally, the driving circuit is further coupled with a brake short-circuit detection module, the brake short-circuit detection module is configured to detect whether the brake resistor is short-circuited and output a brake short-circuit signal, and the control module is coupled with the brake short-circuit detection module and configured to receive the brake short-circuit signal and output a control signal.
By adopting the technical scheme: when the brake resistor is in short circuit, large current can instantly flow through the brake resistor detection module, the current is larger than a preset standard current value, and the control module controls the switch module to be switched off after receiving signals, so that the protection purpose is achieved, and the reliability of the circuit is further improved.
Optionally, the braking time detection module further includes a third resistor R3 and a fourth resistor R4 connected in series with the third resistor R3, two ends of the third resistor R3 connected in series with the fourth resistor R4 are connected in parallel to the braking resistor, an input end of the conduction detection component is coupled to two ends of the fourth resistor R4, and an output end of the conduction detection component is coupled to the control module.
By adopting the technical scheme: the series voltage division of the third resistor R3 and the fourth resistor R4 can reduce the voltage across the fourth resistor R4, thereby increasing the selectable range of the voltage level of the conduction detection element.
Optionally, the switch module includes a first switch element and a second switch element, a starting resistor is disposed on the driving circuit, the second switch element is coupled to the starting resistor, two ends of the starting resistor connected to the second switch element are respectively connected to a bus loop of the driving circuit, the first switch element is coupled to two ends of the starting resistor connected to the second switch element, the first switch element and the second switch element are coupled to the control module, the control module is configured to output a first control signal and a second control signal, the first switch element is configured to receive the first control signal to turn on or off the first switch element, and the second switch element is configured to receive the second control signal to turn on or off the second switch element.
By adopting the technical scheme: compared with the common switch module, the second switch element is added, when a fault occurs, the first switch element and the second switch element can be disconnected, so that the bus has no voltage, and the working safety of the driver is improved; the second switch element is electrically connected with a loop where the starting resistor is located, the loop only works when the driver is started in a buffering mode, and does not work under the condition that the main loop works normally.
Optionally, the control module is coupled with a power supply module, an input end of the power supply module is coupled with the ac input end, and an output end of the power supply module is coupled with the control module, and is used for controlling power supply of the module.
By adopting the technical scheme: in the starting process, the power supply module is started firstly, after the power supply module supplies power, the control module works normally, the switch module is started, and the protection function is started normally; if in the starting process, the power module has faults, no power output exists, the switch module does not act, and the bus voltage cannot rise, so that the whole circuit is further protected.
Drawings
Fig. 1 is a schematic diagram of a circuit configuration of the related art;
fig. 2 is a schematic circuit diagram according to an embodiment of the present application.
Description of reference numerals: 1. a braking time detection module; 2. a control module; 3. a switch module; 31. a first switching element; 32. a second switching element; 4. a power supply module; 5. a bus short circuit detection module; 6. starting a time detection module; 7. and a brake short circuit detection module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 2 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
The embodiment of the application discloses an alternating current driver protection circuit.
Referring to fig. 2, an ac driver protection circuit includes a driving circuit, the driving circuit is coupled with a braking time detection module 1, a control module 2 and a switch module 3, the braking resistor is a second resistor R2, the braking time detection module 1 is configured to detect an on time of the braking resistor and output a braking time signal, the control module 2 is coupled with the braking time detection module 1 and configured to receive the braking time signal and output a control signal, the switch module 3 is electrically connected in a bus loop of the driving circuit, and the switch module 3 is coupled with the control module 2 and configured to receive the control signal so as to turn on or off the switch module 3.
During the detection of the braking time, the upper limit value of the braking time needs to be preset, in the servo industry, the braking time of the operation of a single shaft is shorter, generally 1-2S, namely the upper limit value of the braking time can be preset to 2S. The time is counted from the time when the second resistor R2 is turned on, and when the on time is greater than the preset upper limit value of the braking time, the fault state is determined. The detected braking time signal is processed by the control module 2, and when the fault is judged to occur, the control module 2 outputs a control signal to turn off the switch module 3, so that the bus has no voltage, the damage caused by overheating of the second resistor R2 is reduced, and the working safety of the driver is improved.
Referring to fig. 2, specifically, the control module 2 is a Micro Control Unit (MCU) having a comparator therein, and the braking time detection module 1 includes a conduction detection element, a third resistor R3 and a fourth resistor R4, wherein the conduction detection element is coupled to two ends of the second resistor R2 and is configured to detect a conduction time of the second resistor R2 and output a braking time signal.
In this embodiment, the conduction detection component may adopt an optocoupler U1, a model PS2501, and an optocoupler U1 that is connected in a long-term manner, and may detect the conduction time of the second resistor R2. The third resistor R3 and the fourth resistor R4 are connected in series, two ends of the series are connected in parallel to the second resistor R2, a first input end and a second input end of the optocoupler U1 are coupled to two ends of the fourth resistor R4, a third output end is grounded, and a fourth output end is coupled to the control module 2. The voltage at the two ends of the fourth resistor R4 can be reduced by the series voltage division of the third resistor R3 and the fourth resistor R4, so that the voltage grade selectable range of the optocoupler U1 is increased, and compared with the situation that the optocoupler U1 is directly connected to the two ends of the second resistor R2, the optocoupler U1 with small voltage can be selected, so that the cost is saved.
Referring to fig. 2, the switch module 3 includes a first switch element 31 and a second switch element 32, a starting resistor is disposed on a bus loop of the driving circuit, the starting resistor is a first resistor R1, the first switch element 31 and the second switch element 32 may be relays, in other embodiments, the starting resistor may also be a buffer network formed by a plurality of resistors, and the first switch element 31 and the second switch element 32 may also be thyristors. The first switch element 31 and the second switch element 32 are coupled to the control module 2, the control module 2 is configured to output a first control signal and a second control signal, the first switch element 31 is configured to receive the first control signal to turn itself on or off, and the second switch element 32 is configured to receive the second control signal to turn itself on or off.
Referring to fig. 2, a first resistor R1 is connected in series with a relay RLY2, two ends of the series are respectively connected to a bus circuit of the driving circuit, a relay RLY1 is coupled to two ends of the series of the first resistor R1 and the relay RLY2, the relay RLY1 is used for receiving a first control signal to turn on or off itself, and the relay RLY2 is used for receiving a second control signal to turn on or off itself. The relay RLY2 is connected in the loop of the starting resistor, the loop only works when the driver is started in a buffering mode, under the condition that the main loop works normally, the relay RLY2 does not work, and meanwhile, because the relay RLY2 and the starting resistor are connected in series to divide voltage, the relay RLY2 can select a component with low current, and therefore cost is saved.
Referring to fig. 2, in order to facilitate the power supply of the control module 2, a power module 4 is coupled to the control module 2, an input end of the power module 4 is electrically connected to an AC input end, an output end of the power module 4 is electrically connected to the control module 2, the power module 4 may be an AC/DC power converter, such as a power converter with model ABL2REM24015K, with input voltage AC 100-240V and output DC24V, which can convert an external power source into DC power suitable for the control module 2. In the starting process, if the power module 4 has a fault, no power output exists, the control module 2 cannot work, the switch module 3 cannot be switched on, the bus voltage cannot rise, and accordingly the whole circuit is further protected.
Referring to fig. 2, the bus short-circuit detection module 5 is further coupled to the driving circuit, and the bus short-circuit detection module 5 includes an element to be detected, in this example, the element to be detected is a sixth resistor R6, a current of the sixth resistor R6 may be sampled and input to the control module 2, and power is calculated, when the power value is greater than a preset standard power value, it is determined that a bus short-circuit fault occurs, and the control module 2 controls the relay RLY1 and the relay RLY2 to be turned off, so that the safety of the driver operation is further improved. In other embodiments, the to-be-detected element can also use a current hall sensor or the like to determine whether the bus short-circuit fault occurs by detecting the current of the bus loop.
Referring to fig. 2, the driving circuit is further coupled with a start time detection module 6, and the start time detection module 6 includes a clock module, which can be RX8025SAAC, and can implement a timing function. A voltage sensor is arranged in the driving circuit, the clock module starts timing when the driver starts, when the preset starting time is reached, the starting time detection module 6 outputs a starting time signal, the control module 2 acquires a bus voltage value through the voltage sensor and compares the bus voltage value with a standard voltage value, when the voltage value is smaller than the preset standard voltage value, the starting fault is judged, the control module 2 outputs a disconnected control signal, and the switch module 3 is switched off.
It should be understood that when the component parameters of the driver circuit are determined, the start-up time of the driver is also determined. For example, in the driving circuit of this embodiment, the resistive device in the start buffer loop is R1, the capacitive device is C1, and the theoretical charging time t = 3R1C1 of this circuit. In order to improve the accuracy, an error time is set, the error time is usually set within 10S, and the theoretical charging time plus 10S is the preset starting time. And outputting a starting time signal after the clock module times for 10S, namely finishing the starting.
Referring to fig. 2, the brake short-circuit detection module 7 is further coupled to the driving circuit, and the brake short-circuit detection module 7 includes a to-be-detected element, in this example, the to-be-detected element is a fifth resistor R5, a detection circuit composed of a triode may be used to obtain a transient current value of the fifth resistor R5, and in other embodiments, a current hall sensor may also be used. When the second resistor R2 is short-circuited and the brake device IGBT1 is turned on, a large current flows through the fifth resistor R5 instantaneously and is greater than a preset standard current value, the control module 2 outputs a turn-off control signal, and the switch module 3 is turned off, so that the protection purpose is achieved, and the reliability of the circuit is further improved.
The implementation principle of the alternating current driver protection circuit in the embodiment of the application is as follows: the optocoupler U1 is connected directly for a long time, and when the driver brakes, the optocoupler U1 can detect the conduction time, namely the braking time, of the second resistor R2 and output a braking time signal. Control module 2 judges after receiving the braking time signal, and when braking time exceeded standard range, control module 2 output control signal so that relay RLY1, relay RLY2 turn off, enable the generating line no voltage, compare in the temperature detection protection, need not to wait for the time of intensification, to this, can improve the sensitivity of detection to reduce the brake resistance and overheat and lead to damaging, improve the security of driver work.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (7)
1. An ac driver protection circuit, comprising: the brake control device comprises a driving circuit, wherein a brake time detection module (1), a control module (2) and a switch module (3) are coupled to the driving circuit;
the brake time detection module (1) is used for detecting the conduction time of a brake resistor and outputting a brake time signal, the control module (2) is coupled with the brake time detection module (1) and used for receiving the brake time signal and outputting a control signal, the switch module (3) is coupled in a bus loop of the driving circuit, and the switch module (3) is coupled with the control module (2) and used for receiving the control signal to enable the switch module to be switched on or switched off; the switching module (3) comprises a first switching element (31) and a second switching element (32), the driving circuit is provided with a starting resistor, the second switching element (32) is coupled with the starting resistor, the two ends of the starting resistor connected with the second switch element (32) are respectively connected with a bus circuit of the drive circuit, the first switch element (31) is coupled to the two ends of the starting resistor connected with the second switch element (32), the first switch element (31) and the second switch element (32) are coupled with the control module (2), the control module (2) is used for outputting a first control signal and a second control signal, the first switch element (31) is used for receiving the first control signal to switch on or off, the second switch element (32) is used for receiving a second control signal to switch on or off.
2. An ac driver protection circuit according to claim 1, wherein: the brake time detection module (1) comprises a conduction detection assembly, and the conduction detection assembly is coupled to two ends of the brake resistor and used for detecting the conduction time of the brake resistor and outputting a brake time signal.
3. An ac driver protection circuit according to claim 1, wherein: the driving circuit is further coupled with a bus short-circuit detection module (5), the bus short-circuit detection module (5) is used for detecting whether the bus and the power loop are short-circuited and outputting a bus short-circuit signal, and the control module (2) is coupled with the bus short-circuit detection module (5) and used for receiving the bus short-circuit signal and outputting a control signal.
4. An ac driver protection circuit according to claim 1, wherein: the driving circuit is further coupled with a starting time detection module (6), the starting time detection module (6) is used for detecting the starting time of the alternating current driver and outputting a starting time signal, the control module (2) is coupled with the starting time detection module (6) and used for receiving the starting time signal, and the control module (2) is used for judging whether the bus voltage is normal or not and outputting a control signal.
5. An ac driver protection circuit according to claim 1, wherein: the driving circuit is further coupled with a brake short-circuit detection module (7), the brake short-circuit detection module (7) is used for detecting whether the brake resistor is short-circuited and outputting a brake short-circuit signal, and the control module (2) is coupled with the brake short-circuit detection module (7) and is used for receiving the brake short-circuit signal and outputting a control signal.
6. An ac driver protection circuit according to claim 2, wherein: the braking time detection module (1) further comprises a third resistor R3 and a fourth resistor R4 connected in series with the third resistor R3, two ends of the third resistor R3 connected in series with the fourth resistor R4 are connected in parallel to the braking resistor, an input end of the conduction detection component is coupled to two ends of the fourth resistor R4, and an output end of the conduction detection component is coupled to the control module (2).
7. An ac driver protection circuit according to claim 1, wherein: the control module (2) is coupled with a power supply module (4), the input end of the power supply module (4) is coupled with the alternating current input end, and the output end of the power supply module (4) is coupled with the control module (2) and used for controlling the power supply of the control module (2).
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| CN202110560818.9A CN113241729B (en) | 2021-05-22 | 2021-05-22 | Alternating current driver protection circuit |
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| CN202110560818.9A CN113241729B (en) | 2021-05-22 | 2021-05-22 | Alternating current driver protection circuit |
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| CN114698470B (en) * | 2022-04-02 | 2024-05-24 | 浙江联宜电机有限公司 | Braking control method for built-in braking resistor module of mower motor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202488098U (en) * | 2011-12-27 | 2012-10-10 | 北京中纺锐力机电有限公司 | Brake-phase short-circuit detecting, judging and protecting device |
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| KR100434148B1 (en) * | 2002-03-05 | 2004-06-04 | 엘지산전 주식회사 | Input over voltage protection of power conversion systems |
| CN102957163A (en) * | 2011-08-23 | 2013-03-06 | 台达电子企业管理（上海）有限公司 | Direct-current chopper and direct-current chopping method for doubly-fed induction generator system |
| US9013123B2 (en) * | 2013-04-22 | 2015-04-21 | Rockwell Automation Technologies, Inc. | Self protected dynamic braking |
| CN212380935U (en) * | 2020-06-04 | 2021-01-19 | 深圳市汇川技术股份有限公司 | Brake resistor protection circuit and frequency converter |
| CN112260223A (en) * | 2020-10-28 | 2021-01-22 | 珠海格力电器股份有限公司 | Protection circuit and driver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202488098U (en) * | 2011-12-27 | 2012-10-10 | 北京中纺锐力机电有限公司 | Brake-phase short-circuit detecting, judging and protecting device |
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