CN112186717B - Power protection circuit and robot arm - Google Patents
Power protection circuit and robot arm Download PDFInfo
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- CN112186717B CN112186717B CN201910597580.XA CN201910597580A CN112186717B CN 112186717 B CN112186717 B CN 112186717B CN 201910597580 A CN201910597580 A CN 201910597580A CN 112186717 B CN112186717 B CN 112186717B
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- 230000002159 abnormal effect Effects 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 11
- 230000000740 bleeding effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 description 28
- 238000010586 diagram Methods 0.000 description 8
- 230000005856 abnormality Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The application relates to the technical field of motor power supplies, and provides a power supply protection circuit and a mechanical arm. The power supply protection circuit includes: a first power supply circuit; a second power supply circuit; the power supply protection circuit is connected between the first power supply circuit and the output end of the power supply protection circuit and is used for cutting off the power supply of the first power supply circuit when the power supply of the first power supply circuit is abnormal; the controller is respectively connected with the first power supply circuit, the second power supply circuit and the power supply protection circuit and is used for detecting power supply parameters of the first power supply circuit, and sending an enabling signal to the power supply protection circuit when the power supply of the first power supply circuit is abnormal so as to enable the power supply protection circuit to cut off the power supply of the first power supply circuit; wherein the second power supply circuit is used for supplying power to the controller. The application realizes double power supply and has a hardware and software double protection mechanism.
Description
[ field of technology ]
The application relates to the technical field of motor power supplies, in particular to a power supply protection circuit and a mechanical arm.
[ background Art ]
Because the power supply has some unstable factors, in order to prevent the unstable factors from affecting the circuit to be powered or the equipment to be powered (such as a robot arm, etc.), a power supply protection circuit, which is generally a hardware protection circuit, is provided to realize overcurrent protection, overvoltage protection, slow start, etc.
In carrying out the application, the inventors have found that the prior art has at least the following problems: at present, a device to be powered corresponds to a power supply source, the power supply source supplies power for the device to be powered and a controller of the device to be powered at the same time, and the device to be powered supplied by a single power supply is only provided with a hardware protection circuit, so that when the corresponding hardware protection circuit fails or sensitivity is reduced, reliability is reduced, and even potential safety hazards are caused.
[ application ]
In order to solve the technical problems, the embodiment of the application provides a power supply protection circuit and a mechanical arm, which can realize double power supply and have a hardware and software double protection mechanism, thereby improving the reliability.
In order to solve the above technical problems, an embodiment of the present application provides a power protection circuit, including:
a first power supply circuit;
a second power supply circuit;
the power supply protection circuit is connected between the first power supply circuit and the output end of the power supply protection circuit and is used for cutting off the power supply of the first power supply circuit when the power supply of the first power supply circuit is abnormal;
the controller is respectively connected with the first power supply circuit, the second power supply circuit and the power supply protection circuit and is used for detecting power supply parameters of the first power supply circuit, and sending an enabling signal to the power supply protection circuit when the power supply of the first power supply circuit is abnormal so as to enable the power supply protection circuit to cut off the power supply of the first power supply circuit;
wherein the second power supply circuit is used for supplying power to the controller.
Optionally, the power supply protection circuit further comprises a first feed protection circuit and a bleeder circuit;
the first feed protection circuit is connected with the output end of the power supply protection circuit and the bleeder circuit, and is used for starting the bleeder circuit to bleeder feed energy from the output end of the power supply protection circuit when the voltage of the output end of the power supply protection circuit is larger than a first preset reference voltage;
the bleeder circuit is also connected with the output end of the power supply protection circuit, and is used for bleeding feed energy from the output end of the power supply protection circuit.
Optionally, the power supply protection circuit further includes a second feed protection circuit, the second feed protection circuit is connected with the controller and the bleeder circuit, the controller is connected with the output end of the power supply protection circuit, the controller is further used for detecting the voltage of the output end of the power supply protection circuit, when the voltage of the output end of the power supply protection circuit is greater than a second preset reference voltage and the first feed protection circuit works abnormally, a control signal is sent to the second feed protection circuit, so that the second feed protection circuit starts the bleeder circuit to release feed energy from the output end of the power supply protection circuit.
Optionally, the bleeder circuit includes a first MOS transistor and a first resistor;
the grid electrode of the first MOS tube is connected with the first feed protection circuit, the drain electrode of the first MOS tube is connected with the output end of the power supply protection circuit, and the source electrode of the first MOS tube is connected with one end of the first resistor;
the other end of the first resistor is connected with the ground.
Optionally, the first feed protection circuit includes a comparator, a first diode, a second resistor, a third resistor, and a fourth resistor;
the first port of the comparator is connected with the output end of the power supply protection circuit, the second port of the comparator is used for receiving the first preset reference voltage, the third port of the comparator is used for receiving the first direct current voltage, the fourth port of the comparator is connected with the ground, and the fifth port of the comparator is connected with the anode of the first diode and one end of the second resistor;
the cathode of the first diode is connected with one end of the fourth resistor and the bleeder circuit;
the other end of the second resistor is connected with one end of the third resistor;
the other end of the third resistor is connected with the ground; the other end of the fourth resistor is connected with the ground terminal.
Optionally, the second feed protection circuit includes a first PNP transistor, a first NPN transistor, and a fifth resistor;
the base electrode of the first PNP triode is connected with the collector electrode of the first NPN triode and one end of the fifth resistor, the collector electrode of the first PNP triode is connected with the bleeder circuit, the emitter electrode of the first PNP triode is connected with the other end of the fifth resistor, and the emitter electrode of the first PNP triode is used for receiving a second direct-current voltage;
the base electrode of the first NPN triode is connected with the controller, and the emitting electrode of the first NPN triode is connected with the ground terminal.
Optionally, the power protection circuit further includes:
the first current detection circuit is respectively connected with the power supply protection circuit, the output end of the power supply protection circuit and the controller and is used for detecting the output current of the output end of the power supply protection circuit and sending the output current to the controller;
the second current detection circuit is respectively connected with the first current detection circuit, the bleeder circuit and the controller and is used for detecting the feed current flowing through the bleeder circuit and sending the feed current to the controller;
the controller is further used for detecting output voltage of the output end of the power supply protection circuit, calculating real-time power consumption according to the output voltage and the output current, and cutting off the first power supply circuit when the real-time power consumption is abnormal.
Optionally, the power protection circuit further comprises a first reverse connection preventing circuit and a second reverse connection preventing circuit;
the first reverse connection preventing circuit is connected between the first power supply circuit and the power supply protection circuit;
the second reverse connection preventing circuit is connected between the second power supply circuit and the controller.
Optionally, the power protection circuit further includes a communication circuit, and the communication circuit is connected with the controller.
The embodiment of the application also provides a robot arm which comprises the power supply protection circuit.
The beneficial effects of the application are as follows: compared with the prior art, the embodiment of the application provides a power supply protection circuit and a mechanical arm. When the power supply of the first power supply circuit is abnormal, the power supply of the first power supply circuit is cut off through the power supply protection circuit, so that the hardware protection of the first power supply circuit is realized; and detecting the power supply parameter of the first power supply circuit by the controller, and sending an enabling signal to the power supply protection circuit when the power supply of the first power supply circuit is abnormal, so that the power supply protection circuit cuts off the power supply of the first power supply circuit, thereby realizing the software protection of the first power supply circuit. Therefore, the application can realize double power supply and has a hardware and software double protection mechanism, thereby improving the reliability. In addition, the controller is provided with a second power circuit which is independently powered, and when the power supply of the first power circuit is abnormal, the software protection of the controller is not affected, so that the reliability of the protection circuit is further improved.
[ description of the drawings ]
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic structural diagram of a power protection circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power protection circuit according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a power protection circuit according to another embodiment of the present application;
fig. 4 is a schematic circuit connection diagram of a first power supply protection circuit, a second power supply protection circuit and a bleeder circuit according to an embodiment of the present application;
fig. 5 is a schematic circuit connection diagram of a first anti-reverse connection circuit and a power supply protection circuit according to an embodiment of the present application.
[ detailed description ] of the application
In order that the application may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the application described below can be combined with one another as long as they do not conflict with one another.
Fig. 1 is a schematic structural diagram of a power protection circuit according to an embodiment of the application. As shown in fig. 1, the power supply protection circuit 100 includes a first power supply circuit 101, a second power supply circuit 102, a power supply protection circuit 103, and a controller 104.
The first power circuit 101 is a main power supply for supplying power to a circuit to be powered or a device to be powered, and the second power circuit 102 is used for supplying power to the controller 104.
The first power supply circuit 101 and the second power supply circuit 102 may be classified as a direct current power supply or an alternating current power supply according to the type of voltage output. The common circuit forms of the first power circuit 101 and the second power circuit 102 are a storage battery, an ac mains supply, etc., and it is understood that the circuit forms of the first power circuit 101 and the second power circuit 102 may also be a switching power supply, an inverter power supply, an ac regulated power supply, a DC/DC power supply, a module power supply, a variable frequency power supply, a UPS power supply, a linear power supply, a voltage regulating power supply, a transformer power supply, etc. The power supply parameters of the first power supply circuit 101 and the second power supply circuit 102 may include one or more of input current, start-up current, ripple current, output voltage, voltage dynamic response time, power supply temperature, power strength, power factor, harmonic component, and power supply lifetime.
The power supply protection circuit 103 is connected between the first power supply circuit 101 and the power supply protection circuit output terminal 10, and is configured to cut off the power supply of the first power supply circuit 101 when an abnormality occurs in the power supply of the first power supply circuit 101.
As shown in fig. 5, the power supply protection circuit 103 includes a power supply protection chip U2, a second MOS transistor Q4, and a sixth resistor R6, when the power supply protection chip U2 outputs a high-level signal, the second MOS transistor Q4 is turned on, so that the drain electrode of the second MOS transistor Q4 and the source electrode of the second MOS transistor Q4 are turned on, and the power supply circuits of the first power supply circuit 101 and the power supply protection circuit output end 10 are turned on, so that the output of the first power supply circuit 101 is effective. When the power supply protection chip U2 outputs a low level signal, the second MOS transistor Q4 is turned off, so that the drain electrode of the second MOS transistor Q4 is insulated from the source electrode of the second MOS transistor Q4, and the power supply loop of the first power supply circuit 101 and the power supply loop of the power supply protection circuit output end 10 are disconnected, so that the power supply of the first power supply circuit 101 is cut off.
Specifically, the power supply protection circuit 103 may implement pure hardware protection functions such as slow circuit start, overvoltage protection, and overcurrent protection according to the detection result of the power supply protection chip U2 on the first power supply circuit 101. The power supply protection circuit 103 can also cut off the second MOS transistor Q4 according to the detection result of the power supply protection chip U2 on the back-end circuit when the back-end circuit is short-circuited, so as to realize a short-circuit protection function. The controller 104 sends an enabling signal to the power supply protection circuit 103 according to the power supply parameters of the first power supply circuit 101 when the power supply of the first power supply circuit 101 is abnormal, so that the power supply protection circuit 103 cuts off the power supply of the first power supply circuit 101, and software protection of the controller on the power supply is realized.
The controller 104 is connected to the first power supply circuit 101, the second power supply circuit 102, and the power supply protection circuit 103, and is configured to detect a power supply parameter of the first power supply circuit 101, and send an enable signal to the power supply protection circuit 103 when an abnormality occurs in power supply of the first power supply circuit 101, so that the power supply protection circuit 103 cuts off power supply of the first power supply circuit 101.
Wherein the controller 104 comprises at least one processor and a memory communicatively coupled to the at least one processor. Wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to execute a power supply parameter according to the first power supply circuit 101, and when an abnormality occurs in the power supply of the first power supply circuit 101, send an enable signal to the power supply protection circuit 103 to enable the power supply protection circuit 103 to cut off the power supply of the first power supply circuit 101.
In some embodiments, the controller 104 may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a single-chip, ARM (Acorn RISC Machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. The controller 104 may also be any conventional processor, controller, microcontroller, or state machine.
The embodiment of the application provides a power supply protection circuit, which cuts off the power supply of a first power supply circuit when the power supply of the first power supply circuit is abnormal, so as to realize hardware protection of the first power supply circuit; and detecting the power supply parameter of the first power supply circuit by the controller, and sending an enabling signal to the power supply protection circuit when the power supply of the first power supply circuit is abnormal, so that the power supply protection circuit cuts off the power supply of the first power supply circuit, thereby realizing the software protection of the first power supply circuit. Therefore, the application can realize double power supply and has a hardware and software double protection mechanism, thereby improving the reliability. In addition, the controller is provided with a second power circuit which is independently powered, and when the power supply of the first power circuit is abnormal, the software protection of the controller is not affected, so that the reliability of the protection circuit is further improved.
Fig. 2 is a schematic structural diagram of a power protection circuit according to another embodiment of the application. As shown in fig. 2, the power protection circuit 200 includes, in addition to the first power circuit 101, the second power circuit 102, the power supply protection circuit 103, and the controller 104 included in the power protection circuit 100, a first power supply protection circuit 201, a bleeder circuit 202, a second power supply protection circuit 203, a first current detection circuit 204, a second current detection circuit 205, a first anti-reverse connection circuit 206, a second anti-reverse connection circuit 207, and a communication circuit 208.
The first feed protection circuit 201 is connected to the power protection circuit output terminal 10 and the bleeder circuit 202, where the first feed protection circuit 201 is configured to start the bleeder circuit 202 to discharge the feed energy from the power protection circuit output terminal 10 when the voltage of the power protection circuit output terminal 10 is greater than a first preset reference voltage, so as to implement hardware protection of feed discharging.
Referring to fig. 4, the first feed protection circuit 201 includes a comparator U1, a first diode D1, a second resistor R2, a third resistor R3, and a fourth resistor R4.
The first port 1 of the comparator U1 is connected with the output end 10 of the power protection circuit, the second port 2 of the comparator U1 is used for receiving the first preset reference voltage, the third port 3 of the comparator U1 is used for receiving a first direct current voltage, the fourth port 4 of the comparator U1 is connected with a ground end, and the fifth port 5 of the comparator U1 is connected with the anode of the first diode D1 and one end of the second resistor R2; the cathode of the first diode D1 is connected to one end of the fourth resistor R4 and the bleeder circuit 202; the other end of the second resistor R2 is connected with one end of the third resistor R3; the other end of the third resistor R3 is connected with the ground terminal; the other end of the fourth resistor R4 is connected with the ground terminal.
The second feed protection circuit 203 is connected to the controller 104 and the bleeder circuit 202, the controller 104 is connected to the power protection circuit output end 10, the controller 104 is further configured to detect a voltage of the power protection circuit output end 10, and send a control signal to the second feed protection circuit 203 when the voltage of the power protection circuit output end 10 is greater than a second preset reference voltage and the first feed protection circuit 201 works abnormally, so that the second feed protection circuit 203 starts the bleeder circuit 202 to bleed feed energy from the power protection circuit output end 10, and software protection of feed discharging is implemented.
It should be noted that the first preset reference voltage and the second preset reference voltage may be the same or different. Preferably, the first preset reference voltage is smaller than the second preset reference voltage, so that when the power supply and the power discharge are electrically protected, the first power supply protection circuit 201 plays a role in hardware protection first, and when the first power supply protection circuit 201 works abnormally, the second power supply protection circuit 203 can still play a role in software protection, thereby realizing dual protection of hardware and software, and further improving reliability.
The second feed protection circuit 203 includes a first PNP transistor Q2, a first NPN transistor Q3, and a fifth resistor R5.
The base electrode of the first PNP triode Q2 is connected with the collector electrode of the first NPN triode Q3 and one end of the fifth resistor R5, the collector electrode of the first PNP triode Q2 is connected with the cathode of the first diode D1 and the gate electrode of the first MOS tube Q1, the emitter electrode of the first PNP triode Q2 is connected with the other end of the fifth resistor R5, and the emitter electrode of the first PNP triode Q2 is used for receiving a second direct current voltage; the base of the first NPN triode Q3 is connected to the controller 104, and the emitter of the first NPN triode Q3 is connected to the ground. The second dc voltage and the first dc voltage may be the same dc voltage, that is, the emitter of the first PNP transistor Q2 is connected to the third port 3 of the comparator U1.
In this embodiment, the second resistor R2 and the third resistor R3 are a voltage sampling circuit, and a connection point of the second resistor R2 and the third resistor R3 is connected to the controller 104, so as to determine the working state of the first feed protection circuit 201 according to the voltage division between the second resistor R2 and the third resistor R3. When the voltage at the output end 10 of the power supply protection circuit is greater than a second preset reference voltage and the first feed protection circuit 201 works abnormally, the controller 104 sends a control signal to the second feed protection circuit 203, the control signal acts on the base electrode of the first NPN triode Q3, the first NPN triode Q3 is conducted, the base electrode voltage of the first PNP triode Q2 is pulled to 0 potential, the first PNP triode Q2 meets the conducting condition, outputs a high-level signal to the gate electrode of the first MOS tube Q1, and conducts the first MOS tube Q1, so that the bleeder circuit 202 is started to release the feed energy from the second power supply circuit 102.
It will be appreciated that if the first preset reference voltage is smaller than the second preset reference voltage, the first power supply protection circuit 201 is activated prior to the second power supply protection circuit 203, so as to implement hardware protection of the power supply circuit. When the first feed protection circuit 201 works in a normal state, when the voltage of the power supply protection circuit output terminal 10 is greater than a first preset reference voltage, the first feed protection circuit 201 triggers the starting of the bleeder circuit 202 to release the feed energy from the power supply protection circuit output terminal 10. When the first power supply protection circuit 201 works abnormally, the first power supply protection circuit 201 does not respond when the voltage of the output end 10 of the power supply protection circuit is greater than the first preset reference voltage, the voltage of the output end 10 of the power supply protection circuit continues to rise, and when the voltage of the output end 10 of the power supply protection circuit is greater than the second preset reference voltage, the controller 104 sends a control signal to the second power supply protection circuit 203 so that the second power supply protection circuit 203 starts the bleeder circuit 202 to release the power supply energy from the output end 10 of the power supply protection circuit, and software protection of power supply discharging is realized.
In some embodiments, if the first preset reference voltage is equal to the second preset reference voltage, the priority of the first feed protection circuit 201 is higher than the priority of the second feed protection circuit 203 according to the priority set by the system. When the first feed protection circuit 201 works in a normal state, when the voltage of the output end 10 of the power protection circuit is greater than the first preset reference voltage or the second preset reference voltage, the first feed protection circuit 201 triggers and starts the bleeder circuit 202 to bleed the feed energy from the output end 10 of the power protection circuit, so as to realize hardware protection of the feed circuit. When the first power supply protection circuit 201 works abnormally, when the voltage of the output end 10 of the power supply protection circuit is greater than the first preset reference voltage or the second preset reference voltage, the controller 104 sends a control signal to the second power supply protection circuit 203, so that the second power supply protection circuit 203 starts the bleeder circuit 202 to release the power supply energy from the output end 10 of the power supply protection circuit, and the software protection of power supply leakage is realized.
The bleeder circuit 202 is further connected to the power supply protection circuit output 10, the bleeder circuit 202 being adapted to bleeder the feed energy from the power supply protection circuit output 10.
The bleeder circuit comprises a first MOS tube Q1 and a first resistor R1, wherein the first resistor R1 is a cement resistor and is suitable for a high-power and high-current bleeder circuit. Specifically, the gate of the first MOS transistor Q1 is connected to the first feed protection circuit 201 and the second feed protection circuit 203, the drain of the first MOS transistor Q1 is connected to the output terminal 10 of the power protection circuit, the source of the first MOS transistor Q1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the ground terminal.
The first current detection circuit 204 is respectively connected to the power supply protection circuit 103, the power supply protection circuit output terminal 10, and the controller 104, and is configured to detect an output current of the power supply protection circuit output terminal 10 and send the detected output current to the controller 104.
The second current detection circuit 205 is respectively connected to the first current detection circuit 204, the bleeder circuit 202, and the controller 104, and is configured to detect a feed current flowing through the bleeder circuit 202 and send the feed current to the controller 104. The controller 104 is further configured to detect an output voltage of the output terminal 10 of the power protection circuit, calculate real-time power consumption according to the output voltage and the output current, and cut off the first power circuit 101 when the real-time power consumption is abnormal.
In this embodiment, the first current detection circuit 204 and the second current detection circuit 205 may each employ a current detection chip ACS712.
The first reverse connection preventing circuit 206 is connected between the first power supply circuit 101 and the power supply protection circuit 103.
As shown in fig. 5, the first reverse connection preventing circuit 206 includes a third MOS transistor Q5, a seventh resistor R7, and an eighth resistor R8, where a gate of the third MOS transistor Q5 is connected to one end of the seventh resistor R7 and one end of the eighth resistor R8, a drain of the third MOS transistor Q5 is connected to the first power supply circuit 101, a source of the third MOS transistor Q5 is connected to the other end of the seventh resistor R7, the power supply protection chip U2, and the sixth resistor, and the other end of the eighth resistor R8 is connected to the ground.
The second anti-reverse connection circuit 207 is connected between the second power supply circuit 102 and the controller 104. In this embodiment, the second anti-reverse connection circuit 207 includes a second diode (not shown), which reduces the cost of circuit design and is suitable for smaller current circuits compared to the first anti-reverse connection circuit 206.
The communication circuit 208 is coupled to the controller 104. In this embodiment, the communication circuit 208 supports an RS485 communication interface, which is used to connect an external device with the controller 104 in a communication manner, and realize data exchange between the two.
Fig. 3 is a schematic structural diagram of a power protection circuit according to another embodiment of the present application. As shown in fig. 3, the power protection circuit 300 includes, in addition to the circuit blocks of the power protection circuit 200, a first sampling circuit 301, a second sampling circuit 302, a third sampling circuit 303, a first dc circuit 304, a first preset reference voltage circuit 305, and a step-down voltage stabilizing circuit 306.
The first sampling circuit 301 is connected to the first power circuit 101, the first anti-reverse connection circuit 206, and the controller 104, and is configured to collect power supply parameters of the first power circuit 101.
In this embodiment, the first sampling circuit 301 is a voltage sampling circuit, including two resistors (not shown) connected in series, and a resistor voltage division point is connected to the controller 104, where the controller 104 receives a power supply parameter of the first sampling circuit 301, and the power supply parameter is a voltage parameter.
It will be appreciated that, according to the power supply parameters, the circuit form of the first sampling circuit 301 may also be changed, for example, when the power supply parameters include an input current and an output voltage, the first sampling circuit 301 includes a voltage sampling circuit and a current detecting circuit connected to the first power supply circuit 101, and when the power supply circuit or the power supply device has overvoltage, undervoltage, overcurrent, short circuit, and the like, the controller 104 controls the power supply protection circuit 103 to execute a corresponding protection policy.
The second sampling circuit 302 is connected to the power supply protection circuit 103, the first current detection circuit 204, and the controller 104, and is configured to sample an output voltage of the power supply protection circuit 103 and feed back the output voltage to the controller 104.
In this embodiment, the second sampling circuit 302 is a voltage sampling circuit, and includes two resistors (not shown) connected in series, and a resistor voltage dividing point is connected to the controller 104, and the controller 104 receives the output voltage of the power supply protection circuit 103 sampled by the second sampling circuit 302, and adjusts the output of the power supply protection circuit 103 according to the output voltage of the power supply protection circuit 103.
The third sampling circuit 303 is connected to the first current detection circuit 204, the output terminal 10 of the power protection circuit, and the controller 104, and the third sampling circuit 303 is configured to sample the voltage of the output terminal 10 of the power protection circuit.
In this embodiment, the third sampling circuit 303 is a voltage sampling circuit, and includes two resistors (not shown) connected in series, the resistor voltage dividing point is connected to the controller 104, the first feed protection circuit 201 compares the sampled voltage (i.e. the voltage of the resistor voltage dividing point) with a first preset reference voltage, and when the sampled voltage is greater than the first preset reference voltage, the bleeder circuit 202 is started; the controller 104 receives the voltage of the output terminal 10 of the power supply protection circuit sampled by the third sampling circuit 303, and determines whether to turn on the second power supply protection circuit 203 according to the sampled voltage and the working state of the first power supply protection circuit 201.
It can be appreciated that, depending on whether the sampling voltage of the third sampling circuit 303 is greater than the first preset reference voltage or the second preset reference voltage, it is determined whether to turn on the first feeding protection circuit 201 or the second feeding protection circuit 203.
The first dc voltage circuit 304 is connected to the power supply protection circuit 103, the first current detection circuit 204, the first power supply protection circuit 201, the second power supply protection circuit 203, and the controller 104.
The first dc voltage circuit 304 steps down the voltage at the output terminal 10 of the power protection circuit and sends the output voltage of the first dc voltage circuit 304 to the controller 104, so that the first dc voltage circuit 304 has an output feedback function for providing a stable input voltage to the first preset reference voltage circuit 305. The first dc voltage circuit 304 is configured to provide a first dc voltage to the first power supply protection circuit 201 and the second power supply protection circuit 203, that is, provide a power supply voltage to the comparator U1 and the first PNP triode Q2.
The first preset reference voltage circuit 305 is connected to the first dc voltage circuit 304, the first feed protection circuit 201, and the controller 104. The first preset reference voltage circuit 305 is a step-down circuit, and steps down the output voltage of the first dc circuit 304, so as to provide a first preset reference voltage for the first feed protection circuit 201, that is, provide a first preset reference voltage for the inverting input terminal of the comparator U1.
To sum up, the positive input terminal of the comparator U1 (i.e., the first port 1 of the comparator U1) receives the sampling voltage of the third sampling circuit 303, the negative input terminal of the comparator U1 (i.e., the second port 2 of the comparator U1) receives the first preset reference voltage, and when the sampling voltage of the third sampling circuit 303 is greater than the first preset reference voltage, the output terminal of the comparator U1 (i.e., the fifth port 5 of the comparator U1) outputs a high level, and the bleeder circuit 202 is started. Conversely, when the sampling voltage of the third sampling circuit 303 is smaller than the first preset reference voltage, the output end of the comparator U1 (i.e. the fifth port 5 of the comparator U1) outputs a low level, and the bleeder circuit 202 is turned off.
The step-down voltage stabilizing circuit 306 is connected to the second anti-reverse connection circuit 207, the controller 104 and the communication circuit 208, and the step-down voltage stabilizing circuit 306 performs step-down processing on the output voltage of the second power supply circuit 102, so as to provide power supply voltages for the controller 104 and the communication circuit 208.
As another aspect of the embodiments of the present application, the embodiments of the present application provide a robot arm, which includes the power protection circuit disclosed in each of the embodiments above.
When the power supply of the first power supply circuit is abnormal, the power supply of the first power supply circuit is cut off by the robot arm, so that the hardware protection of the first power supply circuit is realized; and detecting the power supply parameter of the first power supply circuit by the controller, and sending an enabling signal to the power supply protection circuit when the power supply of the first power supply circuit is abnormal, so that the power supply protection circuit cuts off the power supply of the first power supply circuit, thereby realizing the software protection of the first power supply circuit. Therefore, the application can realize double power supply and has a hardware and software double protection mechanism, thereby improving the reliability. In addition, the controller is provided with a second power circuit which is independently powered, and when the power supply of the first power circuit is abnormal, the software protection of the controller is not affected, so that the reliability of the protection circuit is further improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the application as described above, which are not provided in detail for the sake of brevity; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (7)
1. A power supply protection circuit, comprising:
a first power supply circuit;
a second power supply circuit;
the power supply protection circuit is connected between the first power supply circuit and the output end of the power supply protection circuit and is used for cutting off the power supply of the first power supply circuit when the power supply of the first power supply circuit is abnormal;
the controller is respectively connected with the first power supply circuit, the second power supply circuit and the power supply protection circuit and is used for detecting power supply parameters of the first power supply circuit, and sending an enabling signal to the power supply protection circuit when the power supply of the first power supply circuit is abnormal so as to enable the power supply protection circuit to cut off the power supply of the first power supply circuit;
wherein the second power supply circuit is used for supplying power to the controller;
the power supply protection circuit further comprises a first feed protection circuit, a bleeder circuit and a second feed protection circuit;
the first feed protection circuit comprises a comparator, a first diode, a second resistor, a third resistor and a fourth resistor, wherein a first port of the comparator is connected with the output end of the power protection circuit, a second port of the comparator is used for receiving a first preset reference voltage, a third port of the comparator is used for receiving a first direct-current voltage, a fourth port of the comparator is connected with a ground end, a fifth port of the comparator is connected with the anode of the first diode and one end of the second resistor, the cathode of the first diode is connected with one end of the fourth resistor and the bleeder circuit, the other end of the second resistor is connected with one end of the third resistor and the controller respectively, the other end of the third resistor is connected with the ground end, and the other end of the fourth resistor is connected with the ground end;
the bleeder circuit is also connected with the output end of the power supply protection circuit and is used for bleeding feed energy from the output end of the power supply protection circuit;
the second feed protection circuit is connected with the controller and the bleeder circuit, the controller is connected with the output end of the power supply protection circuit, the controller is further used for judging the working state of the first feed protection circuit according to the partial pressure of the second resistor and the third resistor, detecting the voltage of the output end of the power supply protection circuit, and sending a control signal to the second feed protection circuit when the voltage of the output end of the power supply protection circuit is larger than a second preset reference voltage and the first feed protection circuit works abnormally, so that the second feed protection circuit starts the bleeder circuit to release feed energy from the output end of the power supply protection circuit.
2. The power protection circuit of claim 1, wherein the bleeder circuit comprises a first MOS transistor and a first resistor;
the grid electrode of the first MOS tube is connected with the first feed protection circuit, the drain electrode of the first MOS tube is connected with the output end of the power supply protection circuit, and the source electrode of the first MOS tube is connected with one end of the first resistor;
the other end of the first resistor is connected with the ground.
3. The power protection circuit of claim 1, wherein the second feed protection circuit comprises a first PNP transistor, a first NPN transistor, and a fifth resistor;
the base electrode of the first PNP triode is connected with the collector electrode of the first NPN triode and one end of the fifth resistor, the collector electrode of the first PNP triode is connected with the bleeder circuit, the emitter electrode of the first PNP triode is connected with the other end of the fifth resistor, and the emitter electrode of the first PNP triode is used for receiving a second direct-current voltage;
the base electrode of the first NPN triode is connected with the controller, and the emitting electrode of the first NPN triode is connected with the ground terminal.
4. The power protection circuit of claim 1, further comprising:
the first current detection circuit is respectively connected with the power supply protection circuit, the output end of the power supply protection circuit and the controller and is used for detecting the output current of the output end of the power supply protection circuit and sending the output current to the controller;
the second current detection circuit is respectively connected with the first current detection circuit, the bleeder circuit and the controller and is used for detecting the feed current flowing through the bleeder circuit and sending the feed current to the controller;
the controller is further used for detecting output voltage of the output end of the power supply protection circuit, calculating real-time power consumption according to the output voltage and the output current, and cutting off the first power supply circuit when the real-time power consumption is abnormal.
5. The power protection circuit of claim 1, further comprising a first anti-reverse circuit and a second anti-reverse circuit;
the first reverse connection preventing circuit is connected between the first power supply circuit and the power supply protection circuit;
the second reverse connection preventing circuit is connected between the second power supply circuit and the controller.
6. The power protection circuit of claim 1, further comprising a communication circuit, wherein the communication circuit is coupled to the controller.
7. A robot arm comprising a power protection circuit according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910597580.XA CN112186717B (en) | 2019-07-04 | 2019-07-04 | Power protection circuit and robot arm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910597580.XA CN112186717B (en) | 2019-07-04 | 2019-07-04 | Power protection circuit and robot arm |
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| CN112186717A CN112186717A (en) | 2021-01-05 |
| CN112186717B true CN112186717B (en) | 2023-12-15 |
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| CN109066798A (en) * | 2018-09-17 | 2018-12-21 | 阳光电源股份有限公司 | A kind of cutoff device of photovoltaic module |
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| TWI364901B (en) * | 2008-12-11 | 2012-05-21 | Delta Electronics Inc | Uninterruptible power supply with low power loss |
| TWI658674B (en) * | 2017-01-20 | 2019-05-01 | 全漢企業股份有限公司 | Power supply system and power output module |
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| JPH096441A (en) * | 1995-06-21 | 1997-01-10 | Toshiba Corp | Rush current prevention circuit |
| CN202888809U (en) * | 2012-09-29 | 2013-04-17 | 广东美的制冷设备有限公司 | PFC dual-protection circuit and air-conditioner |
| CN105811776A (en) * | 2016-03-16 | 2016-07-27 | 阳光电源股份有限公司 | Switching power supply circuit |
| CN207200372U (en) * | 2017-08-17 | 2018-04-06 | 华通信安(北京)科技发展有限公司 | A kind of power-supply management system |
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| CN112186717A (en) | 2021-01-05 |
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