CN215009618U - MCU protection device that crashes based on dynamic voltage restorer - Google Patents
MCU protection device that crashes based on dynamic voltage restorer Download PDFInfo
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- CN215009618U CN215009618U CN202121371849.1U CN202121371849U CN215009618U CN 215009618 U CN215009618 U CN 215009618U CN 202121371849 U CN202121371849 U CN 202121371849U CN 215009618 U CN215009618 U CN 215009618U
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Abstract
The utility model provides a MCU crash protection device based on a dynamic voltage restorer, which can realize that the dynamic voltage restorer device can continuously keep the conduction of a silicon controlled rectifier when the MCU crashes and breaks down, realize timely protection and ensure that load equipment can stably and safely operate; the system comprises a system power supply, a load, a thyristor, an inversion module, a conversion unit, a fault protection unit and the thyristor, wherein the system power supply is connected in series with the load; the conversion unit judges the state of the MCU according to a signal sent by the MCU, so that the circuit is subjected to inversion output level conversion; and the fault protection unit provides a driving signal for the controllable silicon according to the level output of the conversion unit, so that MCU crash protection is realized.
Description
Technical Field
The utility model belongs to the technical field of the electric energy quality control technique and specifically relates to a MCU protection device that crashes based on dynamic voltage restorer is administered to dynamic voltage restorer technique.
Background
The Dynamic Voltage Restorer (DVR) is a series compensation device with an energy storage device, is connected in series between a sensitive load and a system power supply, prevents the sensitive load from working abnormally due to system voltage interference, and when the system voltage is interfered and voltage sag occurs, the dynamic voltage regulator compensates the dropped voltage within 2mS, so that the voltage at the load side cannot experience disturbance, and the safe and reliable operation of the sensitive load is ensured.
When a power supply of a dynamic voltage restorer in the market does not fall, an MCU in the dynamic voltage restorer sends a driving signal to continuously conduct a thyristor connected between the power supply and a load in series, so that stable operation of equipment is ensured, but if the MCU crashes, the thyristor driving signal is possibly lost, the equipment stops working, and heavy loss is caused; the other is inverter module power-off protection, but the two methods still have the following defects:
(1) the disadvantages of manual bypass: the DVR is characterized by online and maintenance-free, and a manual bypass is a remedial measure after a fault occurs, so that timely and effective protection cannot be realized;
(2) and the inverter module has the following defects of power-off protection: the method is characterized in that when the inverter module is powered off, the controlled silicon is continuously conducted to ensure the operation of load equipment, but if the inverter module is not powered off, the driving signal of the controlled silicon is lost due to the halt phenomenon of the MCU, and the scheme does not work.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a MCU protection device that crashes based on dynamic voltage restorer, it can realize that dynamic voltage restorer device can continue to keep the silicon controlled rectifier to switch on when MCU crashes the trouble, realizes timely protection, ensures that load equipment can stabilize safe operation.
The technical scheme is as follows: the utility model provides a MCU protection device that crashes based on dynamic voltage restorer, connects in series between system's power and load, including silicon controlled rectifier, the contravariant module that is connected, the contravariant module includes MCU, its characterized in that: the inverter module also comprises a conversion unit and a fault protection unit, and the MCU, the conversion unit, the fault protection unit and the silicon controlled rectifier are sequentially connected in series;
the conversion unit judges the state of the MCU according to a signal sent by the MCU, so that the circuit is subjected to inversion output level conversion;
and the fault protection unit provides a driving signal for the controllable silicon according to the level output of the conversion unit, so that MCU crash protection is realized.
It is further characterized in that:
the conversion unit comprises resistors R1-R10, a capacitor C1, diodes D1, D2, a voltage follower U1, comparators U2, U3 and a NAND gate U4; the positive input end of the voltage follower U1 is connected with a signal pin end of the MCU, the negative input end of the voltage follower U1 is connected with the output end of the voltage follower U1 and is connected with one end of the resistor R1, the other end of the resistor R1 is connected with one end of the capacitor C1, one end of the resistors R2 and R5, the positive input end of the comparator U2 and the negative input end of the comparator U3, the other ends of the capacitors C1 and R2 are connected and then grounded, the negative input end of the comparator U2 is connected with one ends of the resistors R3 and R4, the other end of the resistor R3 is connected with the power supply 3.3V, the other end of the resistor R4 is grounded, the positive input end of the comparator U3 is connected with one ends of the resistors R6, R7 and R8, the other end of the resistor R7 is connected with the power supply 3.3V, the other end of the resistor R6867 is grounded, and the other end of the resistor R363636 8 is connected with the positive electrode of the diode 2, the cathode of the diode D2 is connected to one end of the resistor R9, the output end of the comparator U3 and the first input end of the nand gate U4, the other end of the resistor R9 is connected to the power supply 5V, the other end of the resistor R5 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to one end of the resistor R10, the output end of the comparator U2 and the second input end of the nand gate U4, the other end of the resistor R10 is connected to the power supply 5V, and the output end of the nand gate U4 is connected to the fault protection unit;
the fault protection unit comprises resistors R11-R16, a triode Q1, a photoelectric coupler U5 and capacitors C2-C4, wherein the photoelectric coupler U5 adopts a model HCPL2631 dual-channel high-speed isolation optocoupler; one end of the resistor R11 is connected to the output end of the nand gate U4, the other end of the resistor R11 is connected to one end of the resistor R12 and the base of the transistor Q1, the other end of the resistor R12 is connected to the emitter of the transistor Q1 and then connected to the power supply 3.3V, the collector of the transistor Q1 is connected to the 4-pin of the photocoupler U5 through the resistor R13 and then connected to the 4-pin of the photocoupler U5, the 1-pin of the photocoupler U5 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to the 2-pin and the 3-pin of the photocoupler U5 and then connected to the ground, the 5-pin of the photocoupler U5 is connected to one end of the capacitors C2, C3 and C4 and then connected to the ground, the 8-pin of the photocoupler U5 is connected to one end of the resistors R9, R6862 and the other end of the capacitor C2 and then connected to the power supply 5V, and the other end of the capacitor U847 is connected to the other end of the capacitor 8427 and then connected to the power supply voltage, The other ends of the resistors R15 are connected; a pin 6 of the photoelectric coupler U5 is connected with the other end of the capacitor C4 and the other end of the resistor R16, and the connection point is used as a fault protection signal end and is connected with a controlled silicon;
the signal sent out by the signal pin end of the MCU is a square wave signal with the frequency of 8KHz and the duty ratio of 50 percent.
The beneficial effects of the utility model are that, the conversion unit is receiving behind the signal that MCU sent, judge the MCU state to doing contravariant output level conversion to the circuit, fault protection unit basis afterwards conversion unit's level output, to the silicon controlled rectifier provides drive signal, thereby realizes MCU crash protection, when can guaranteeing MCU crash, accomplishes timely effectual protection, and response speed is fast, thereby ensures that load equipment can stabilize safe operation.
Drawings
Fig. 1 is a block diagram of the present invention;
fig. 2 is a schematic circuit diagram of a switching unit according to the present invention;
fig. 3 is a schematic circuit diagram of a fault protection unit according to the present invention;
fig. 4 is a flow chart of the present invention.
Detailed Description
As shown in fig. 1-4, the utility model relates to a MCU crash protection device based on dynamic voltage restorer, it connects in series between system power 1 and load 2, including silicon controlled rectifier SCR, the contravariant module that is connected, the contravariant module includes MCU, and silicon controlled rectifier SCR is connected with load 2, and the contravariant module still includes conversion unit 3, fault protection unit 4, MCU, conversion unit 3, fault protection unit 4, silicon controlled rectifier SCR order series connection; the conversion unit 3 judges the state of the MCU according to a signal sent by the MCU, so that the circuit is subjected to inversion output level conversion; and the fault protection unit 4 provides a driving signal for the SCR according to the level output of the conversion unit 3, so that MCU crash protection is realized.
The conversion unit 3 comprises resistors R1-R10, a capacitor C1, diodes D1, D2, a voltage follower U1, comparators U2, U3 and a NAND gate U4; the positive input end of a voltage follower U1 is connected with the signal pin end of the MCU, the signal sent by the signal pin end of the MCU is a square wave signal with the frequency of 8KHz and the duty ratio of 50 percent, the negative input end of a voltage follower U1 is connected with the output end of the voltage follower U1 and is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a capacitor C1, one end of resistors R2 and R5, the positive input end of a comparator U2 and the negative input end of a comparator U3, the other ends of the capacitor C1 and the resistor R2 are connected and then grounded, the negative input end of the comparator U2 is connected with one ends of resistors R3 and R4, the other end of the resistor R3 is connected with a power supply of 3.3V, the other end of the resistor R9 is grounded, the positive input end of the comparator U3 is connected with one ends of resistors R6, R7 and R8, the other end of the resistor R7 is connected with a power supply of 3.3V, the other end of the resistor R6867 is connected with a diode 2, the cathode of the diode D2 is connected to one end of the resistor R9, the output end of the comparator U3 and the first input end of the nand gate U4, the other end of the resistor R9 is connected to the power supply 5V, the other end of the resistor R5 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to one end of the resistor R10, the output end of the comparator U2 and the second input end of the nand gate U4, the other end of the resistor R10 is connected to the power supply 5V, and the output end of the nand gate U4 is connected to the fault protection unit 4.
The fault protection unit 4 comprises resistors R11-R16, a triode Q1, a photoelectric coupler U5 and capacitors C2-C4, and the photoelectric coupler U5 adopts a model HCPL2631 dual-channel high-speed isolation optocoupler; one end of a resistor R11 is connected with the output end of a NAND gate U4, the other end of the resistor R11 is connected with one end of a resistor R12 and the base of a triode Q1, the other end of the resistor R12 is connected with the emitter of a triode Q1 and then connected with a power supply of 3.3V, the collector of the triode Q1 is connected with a pin 4 of a photoelectric coupler U5 through a resistor R13, a pin 1 of the photoelectric coupler U5 is connected with one end of a resistor R14, the other end of the resistor R14 is connected with pins 2 and 3 of a photoelectric coupler U5 and then grounded, a pin 5 of the photoelectric coupler U5 is connected with one ends of capacitors C2, C3 and C4 and then grounded, a pin 8 of the photoelectric coupler U5 is connected with one ends of resistors R15 and R16 and the other end of a capacitor C2 and then connected with a power supply of 5V, and a pin 7 of the photoelectric coupler U5 is connected with the other end of the capacitor C3 and the other end of the resistor R15; and a pin 6 of the photoelectric coupler U5 is connected with the other end of the capacitor C4 and the other end of the resistor R16, and the connection point is used as a fault protection signal end and is connected with the SCR.
The utility model discloses a theory of operation is: after the SCR _ LIVE signal sent by the MCU is a square wave signal (high level 3.3V, low level 0V) with the frequency of 8KHz and the duty ratio of 50 percent, low-pass filtering is carried out: that is, after passing through the voltage follower U1, the voltage passes through a first-order RC low-pass filter composed of a resistor R1 and a capacitor C1, and the cut-off frequency of the filter is 1/(2 pi RC) 31.9Hz, so that the wave passing through the low-pass filter is converted into a direct-current voltage, and the amplitude of the direct-current voltage is about 1.65V (direct-current bias voltage); then, voltage comparison is carried out: comparing the converted direct current voltage with the voltage at the negative input end of a comparator U2 and the voltage at the positive input end of a comparator U3 respectively (here, the level of the comparator U2 is the voltage on a resistor R4, the resistor R3 and a resistor R4 divide the voltage of a power supply by 3.3V and then calculate a voltage value of 0.97V through the existing algorithm, the voltage is a low voltage level, similarly, the level of the comparator U3 divides the voltage of the power supply by the resistors R6 and R7, the level after the voltage division is calculated by the existing algorithm to be 1.89V, the voltage is a high voltage level, if the voltage after passing through a low-pass filter is in the range of 0.97V-1.89V, the MCU is considered to be in a non-halted state), if the direct current voltage is less than 0.97V or more than 1.89V, the MCU is judged to be in a halted state, and the NAND gate is halted, and a high level is output; otherwise, when the MCU is not halted, the NAND gate outputs low level; when the MCU crashes, the signal receiving end SCR _ ALIVE signal on the fault protection unit 4 is changed from low level to high level, the triode Q1 is changed from on state to off state, the photoelectric coupler U5 is changed from on state to off state, the SCR _ LIVE _ SELV signal output by the secondary side of the photoelectric coupler U5 is changed from low level to high level, and the signal is used as a fault protection signal to drive the SCR to be conducted, so that the timely protection of the MCU crash can be realized.
In summary, through the utility model discloses a MCU crash protection device based on dynamic voltage restorer, when the MCU crashed, no matter the MCU pin was put high or put low, this protection device can all accomplish timely effective protection, and the reliability is high; meanwhile, the protection device is on-line detection, the delay from MCU halt to SCR turn-on is within 2 milliseconds, and the response protection speed is high; in addition, the protection device converts MCU crash into high and low level output, and the conversion process can be popularized to a circuit with similar functions and has better flexibility and variability.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. The utility model provides a MCU protection device that crashes based on dynamic voltage restorer, connects in series between system's power and load, including silicon controlled rectifier, the contravariant module that is connected, the contravariant module includes MCU, its characterized in that: the inverter module also comprises a conversion unit and a fault protection unit, and the MCU, the conversion unit, the fault protection unit and the silicon controlled rectifier are sequentially connected in series;
the conversion unit judges the state of the MCU according to a signal sent by the MCU, so that the circuit is subjected to inversion output level conversion;
and the fault protection unit provides a driving signal for the controllable silicon according to the level output of the conversion unit, so that MCU crash protection is realized.
2. The MCU crash protection device based on dynamic voltage restorer of claim 1, wherein: the conversion unit comprises resistors R1-R10, a capacitor C1, diodes D1, D2, a voltage follower U1, comparators U2, U3 and a NAND gate U4; the positive input end of the voltage follower U1 is connected with a signal pin end of the MCU, the negative input end of the voltage follower U1 is connected with the output end of the voltage follower U1 and is connected with one end of the resistor R1, the other end of the resistor R1 is connected with one end of the capacitor C1, one end of the resistors R2 and R5, the positive input end of the comparator U2 and the negative input end of the comparator U3, the other ends of the capacitors C1 and R2 are connected and then grounded, the negative input end of the comparator U2 is connected with one ends of the resistors R3 and R4, the other end of the resistor R3 is connected with the power supply 3.3V, the other end of the resistor R4 is grounded, the positive input end of the comparator U3 is connected with one ends of the resistors R6, R7 and R8, the other end of the resistor R7 is connected with the power supply 3.3V, the other end of the resistor R6867 is grounded, and the other end of the resistor R363636 8 is connected with the positive electrode of the diode 2, the negative pole of the diode D2 is connected with one end of the resistor R9, the output end of the comparator U3 and the first input end of the NAND gate U4, the other end of the resistor R9 is connected with the power supply 5V, the other end of the resistor R5 is connected with the positive pole of the diode D1, the negative pole of the diode D1 is connected with one end of the resistor R10, the output end of the comparator U2 and the second input end of the NAND gate U4, the other end of the resistor R10 is connected with the power supply 5V, and the output end of the NAND gate U4 is connected with the fault protection unit.
3. The MCU crash protection device based on dynamic voltage restorer of claim 2, wherein: the fault protection unit comprises resistors R11-R16, a triode Q1, a photoelectric coupler U5 and capacitors C2-C4, wherein the photoelectric coupler U5 adopts a model HCPL2631 dual-channel high-speed isolation optocoupler; one end of the resistor R11 is connected to the output end of the nand gate U4, the other end of the resistor R11 is connected to one end of the resistor R12 and the base of the transistor Q1, the other end of the resistor R12 is connected to the emitter of the transistor Q1 and then connected to the power supply 3.3V, the collector of the transistor Q1 is connected to the 4-pin of the photocoupler U5 through the resistor R13 and then connected to the 4-pin of the photocoupler U5, the 1-pin of the photocoupler U5 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to the 2-pin and the 3-pin of the photocoupler U5 and then connected to the ground, the 5-pin of the photocoupler U5 is connected to one end of the capacitors C2, C3 and C4 and then connected to the ground, the 8-pin of the photocoupler U5 is connected to one end of the resistors R9, R6862 and the other end of the capacitor C2 and then connected to the power supply 5V, and the other end of the capacitor U847 is connected to the other end of the capacitor 8427 and then connected to the power supply voltage, The other ends of the resistors R15 are connected; and a pin 6 of the photoelectric coupler U5 is connected with the other end of the capacitor C4 and the other end of the resistor R16, and the connection point is used as a fault protection signal end and connected with the controlled silicon.
4. The MCU crash protection device based on dynamic voltage restorer of claim 2, wherein: the signal sent out by the signal pin end of the MCU is a square wave signal with the frequency of 8KHz and the duty ratio of 50 percent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121371849.1U CN215009618U (en) | 2021-06-21 | 2021-06-21 | MCU protection device that crashes based on dynamic voltage restorer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121371849.1U CN215009618U (en) | 2021-06-21 | 2021-06-21 | MCU protection device that crashes based on dynamic voltage restorer |
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| CN215009618U true CN215009618U (en) | 2021-12-03 |
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| CN202121371849.1U Active CN215009618U (en) | 2021-06-21 | 2021-06-21 | MCU protection device that crashes based on dynamic voltage restorer |
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