CN210629092U - Overcurrent protection and automatic normal power supply recovery circuit based on single chip microcomputer - Google Patents
Overcurrent protection and automatic normal power supply recovery circuit based on single chip microcomputer Download PDFInfo
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- CN210629092U CN210629092U CN201921908382.2U CN201921908382U CN210629092U CN 210629092 U CN210629092 U CN 210629092U CN 201921908382 U CN201921908382 U CN 201921908382U CN 210629092 U CN210629092 U CN 210629092U
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Abstract
The utility model discloses an overcurrent protection and automatic recovery normal supply circuit based on singlechip, including singlechip and the power short-circuit protection and the quick recovery circuit of being connected with the singlechip, power short-circuit protection and quick recovery circuit are including the voltage follower U1, differential amplifier U3, sampling circuit and the voltage follower U2 that connect gradually, the input of voltage follower U1 is connected with the DAC output of singlechip, the output of voltage follower U2 is connected with the ADC input of singlechip. The utility model discloses not only can realize the short-circuit protection function of power, can the normal power supply function of automatic recovery when short-circuit fault removes moreover.
Description
Technical Field
The utility model relates to a singlechip power supply technical field, concretely relates to overcurrent protection and automatic recovery normal supply circuit based on singlechip.
Background
In various power electronic products, a power supply is an indispensable component. The motor has wide application in the fields of motor drive, UPS power supply, control system power supply and consumer electronics. The power supply has high reliability, and cannot be damaged particularly when the load has short-circuit fault and generates large impact current. In addition, the power supply should be able to quickly recover normal power supply function when the load short-circuit fault is relieved. At present, the self-recovery fuse is a better current overload protection device, when the current flowing through the self-recovery fuse exceeds a standard value, the self-recovery fuse is in a high-resistance state due to temperature rise to form an effect similar to the effect of cutting off a power supply, the self-recovery fuse can realize a normal power supply function after the temperature is reduced, the defect that the time for the self-recovery fuse to recover from an 'open circuit state' to a normal power supply state is long, and generally, at least several seconds to ten seconds are needed is overcome. The air switch is a very important short-circuit protection device in low-voltage power distribution, has a good protection function on short circuit and overload of a circuit, and cannot automatically recover the power supply function after the power supply is cut off.
SUMMERY OF THE UTILITY MODEL
Not enough to the above-mentioned among the prior art, the utility model provides a pair of overcurrent protection and automatic recovery normal supply circuit based on singlechip have solved the problem that power short-circuit protection exists inadequately.
In order to achieve the purpose of the invention, the utility model adopts the technical scheme that: the utility model provides an overcurrent protection and automatic recovery normal power supply circuit based on singlechip, includes singlechip and the power short-circuit protection and the quick recovery circuit who is connected with the singlechip, power short-circuit protection and quick recovery circuit are including the voltage follower U1, differential amplifier U3, sampling circuit and the voltage follower U2 that connect gradually, the input of voltage follower U1 is connected with the DAC output of singlechip, the output of voltage follower U2 is connected with the ADC input of singlechip.
The utility model has the advantages that: the utility model discloses use ADuC812 singlechip as the core, carry out the output that the impedance matches the back through voltage follower after through single-chip DAC module machine output and send into the power amplifier module and realize voltage, during the measurement, at first sampling circuit carries out output voltage's sample, accomplishes the real-time measurement function of accomplishing output voltage after AD conversion through the ADC module that sends into the singlechip after voltage follower accomplishes impedance matching again, realizes whole power short-circuit protection and the normal power supply of quick recovery through single chip microcomputer control output circuit, the utility model discloses not only can realize the short-circuit protection function of power, moreover can the normal power supply function of automatic recovery when short-circuit fault removes.
Further: the type of the single chip microcomputer is ADuC 812.
Further: the 1 st pin of the single chip microcomputer is an ADC input end, the 5 th pin of the single chip microcomputer is respectively connected with one end of a capacitor C31, the anode of a polar capacitor C28 and one end of a capacitor C27 and is connected with 5V voltage, the 6 th pin of the single chip microcomputer is respectively connected with the other end of a capacitor C31, one end of a capacitor C30, one end of a capacitor C29, the cathode of a polar capacitor C28 and the other end of a capacitor C27 and is grounded, the 7 th pin of the single chip microcomputer is connected with the other end of the capacitor C30, the 8 th pin of the single chip microcomputer is connected with the other end of a capacitor C29, the 9 th pin of the single chip microcomputer is a DAC output end, the 15 th pin of the single chip microcomputer is respectively connected with the cathode of the polar capacitor C15 and a grounding resistor R23, the 20 th pin of the single chip microcomputer is respectively connected with the anode of the polar capacitor C15 and the grounding capacitor C39 and, the 32 th pin of the single chip microcomputer is respectively connected with one end of a crystal oscillator Y1 and a grounding capacitor C34, the 33 th pin of the single chip microcomputer is respectively connected with the other end of a crystal oscillator Y1 and the grounding capacitor C35, the 34 th pin of the single chip microcomputer is connected with the grounding capacitor C33 and connected with 5V voltage, the 35 th pin of the single chip microcomputer is connected with the ground, the 47 th pin of the single chip microcomputer is connected with the ground, and the 48 th pin of the single chip microcomputer is connected with the grounding capacitor C32 and connected with 5V voltage.
The beneficial effect of adopting the further scheme is as follows: the single chip microcomputer integrates an ADC module and a DAC module, the design of a circuit can be simplified, the operation speed of the single chip microcomputer is high, and the functions of real-time measurement and control of output voltage can be achieved.
Further: the voltage follower U1 and the voltage follower U2 are both OP284, and the differential amplifier U3 is OPA 594.
The beneficial effect of adopting the further scheme is as follows: the differential amplifier not only has an amplifying function, but also has strong loading capacity, and can continuously output 8A current at most, thereby realizing the output function of a common power supply.
Further: the sampling circuit comprises a resistor R4 and a resistor R5 which are connected in parallel.
The beneficial effect of adopting the further scheme is as follows: the sampling resistor series circuit can sample the output voltage.
Further: the DAC output end is connected with the 2 end of a voltage follower U1, the 1 end of the voltage follower U1 is respectively connected with the 3 end of a voltage follower U1 and one end of a resistor R2, the 4 end of the voltage follower U1 is connected with a grounding capacitor C42 and is connected with a 5V voltage, the 5 end of the voltage follower U1 is connected with the ground, the other end of the resistor R2 is connected with the 2 end of a differential amplifier U3, the 3 end of the differential amplifier U3 is respectively connected with a grounding resistor R1, the 1 st fixed end of a sliding rheostat RP1 and the sliding end of a sliding rheostat RP1, the 4 end of the differential amplifier U3 is connected with the positive electrode of a polar capacitor C41 and is connected with a 35V DC voltage-stabilized power supply, the negative electrode of the polar capacitor C41 is connected with the ground, the 5 end and the 7 end of the differential amplifier U3 are both connected with the ground, the 6 end of the differential amplifier U3 is floating, the 8 end of the differential amplifier U3, the 1 end of the differential amplifier U3 is connected with one end of a resistor R4, the other end of the resistor R4 is respectively connected with the 2 nd fixed end of a slide rheostat RP1 and one end of a resistor R5 and serves as a direct-current voltage output end, the ADC input end is respectively connected with the 1 end of a voltage follower U2 and the 3 end of a voltage follower U2, the 4 end of the voltage follower U2 is connected with 5V voltage, the 5 end of the voltage follower U2 is grounded, and the 2 end of the voltage follower U2 is respectively connected with the other end of the resistor R5 and a grounding resistor R6.
The beneficial effect of adopting the further scheme is as follows: the sampling circuit is sent to an ADC module of the singlechip after completing impedance matching through a voltage follower.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a circuit diagram of the periphery of a single chip computer in the present invention;
fig. 3 is a circuit diagram of the middle power supply short circuit protection and fast recovery circuit of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes will be apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all inventions contemplated by the present invention are protected.
As shown in fig. 1, an overcurrent protection and automatic normal power restoration circuit based on a single chip microcomputer comprises the single chip microcomputer and a power supply short-circuit protection and quick restoration circuit connected with the single chip microcomputer, wherein the power supply short-circuit protection and quick restoration circuit comprises a voltage follower U1, a differential amplifier U3, a sampling circuit and a voltage follower U2 which are sequentially connected, the input end of the voltage follower U1 is connected with the DAC output end of the single chip microcomputer, and the output end of the voltage follower U2 is connected with the ADC input end of the single chip microcomputer.
In the embodiment of the present invention, the model of the single chip microcomputer is ADuC 812.
In the embodiment of the present invention, as shown in fig. 2, pin 1 of the single chip is an ADC input terminal, pin 5 of the single chip is connected to one end of a capacitor C31, an anode of a polar capacitor C28 and one end of a capacitor C27, respectively, and is connected to 5V voltage, pin 6 of the single chip is connected to the other end of a capacitor C31, one end of a capacitor C30, one end of a capacitor C29, a cathode of a polar capacitor C28 and the other end of a capacitor C27, and is grounded, pin 7 of the single chip is connected to the other end of a capacitor C30, pin 8 of the single chip is connected to the other end of a capacitor C29, pin 9 of the single chip is a DAC output terminal, pin 15 of the single chip is connected to a cathode of a polar capacitor C15 and a ground resistor R23, pin 20 of the single chip is connected to an anode of a polar capacitor C15 and a ground capacitor C39, and is connected to 5V voltage, pin 21 of, the 32 th pin of the single chip microcomputer is respectively connected with one end of a crystal oscillator Y1 and a grounding capacitor C34, the 33 th pin of the single chip microcomputer is respectively connected with the other end of a crystal oscillator Y1 and the grounding capacitor C35, the 34 th pin of the single chip microcomputer is connected with the grounding capacitor C33 and connected with 5V voltage, the 35 th pin of the single chip microcomputer is connected with the ground, the 47 th pin of the single chip microcomputer is connected with the ground, and the 48 th pin of the single chip microcomputer is connected with the grounding capacitor C32 and connected with 5V voltage.
The single chip microcomputer integrates an ADC module and a DAC module, the design of a circuit can be simplified, the operation speed of the single chip microcomputer is high, and the functions of real-time measurement and control of output voltage can be achieved.
In the embodiment of the present invention, the model of the voltage follower U1 and the model of the voltage follower U2 are OP284, and the model of the differential amplifier U3 is OPA 594. The differential amplifier not only has an amplifying function, but also has strong loading capacity, and can continuously output 8A current at most, thereby realizing the output function of a common power supply. The DAC outputs a voltage of 0.000-2.500V, and the differential amplifier outputs a voltage of 0.000-25.000V
In the embodiment of the present invention, the sampling circuit includes a resistor R4 and a resistor R5 connected in parallel. The sampling resistor series circuit can sample the output voltage.
In the embodiment of the present invention, as shown in fig. 3, the DAC output terminal is connected to the 2 terminal of the voltage follower U1, the 1 terminal of the voltage follower U1 is connected to the 3 terminal of the voltage follower U1 and one terminal of the resistor R2, respectively, the 4 terminal of the voltage follower U1 is connected to the ground capacitor C42 and 5V voltage, the 5 terminal of the voltage follower U1 is connected to ground, the other terminal of the resistor R2 is connected to the 2 terminal of the differential amplifier U3, the 3 terminal of the differential amplifier U3 is connected to the ground resistor R1, the 1 st fixed terminal of the sliding rheostat RP1 and the sliding terminal of the sliding rheostat RP1, the 4 terminal of the differential amplifier U3 is connected to the positive terminal of the polar capacitor C41 and 35V dc regulated power supply, the negative terminal of the polar capacitor C8 is connected to ground, the 5 terminal and the 7 terminal of the differential amplifier U3 are connected to ground, the 6 terminal of the differential amplifier U3 is floating, the 8 terminal of the differential amplifier U3, the 1 end of the differential amplifier U3 is connected with one end of a resistor R4, the other end of the resistor R4 is respectively connected with the 2 nd fixed end of a slide rheostat RP1 and one end of a resistor R5 and serves as a direct-current voltage output end, the ADC input end is respectively connected with the 1 end of a voltage follower U2 and the 3 end of a voltage follower U2, the 4 end of the voltage follower U2 is connected with 5V voltage, the 5 end of the voltage follower U2 is grounded, and the 2 end of the voltage follower U2 is respectively connected with the other end of the resistor R5 and a grounding resistor R6. The sampling circuit is sent to an ADC module of the singlechip after completing impedance matching through a voltage follower.
The utility model discloses a working process does: firstly, the voltage is output by using a DAC module of the ADuC812 single chip microcomputer, and then the output voltage is monitored in real time by using an ADC module. When the difference between the monitoring voltage and the output voltage reaches a certain degree, the output is considered to have the possibility of short circuit, then the voltage of the DAC module is gradually reduced, the ADC module is continuously started to monitor the output voltage until the voltage reaches a normal value, and otherwise, the voltage of the DAC module is continuously reduced step by step.
Because of the resistor R4, even if the output terminal is completely short-circuited, the voltage of the DAC module will not be zero, and the OPA549 can still ensure a "normal" output voltage. The ADC module still monitors the output voltage at this time. When the ADC module monitors that the short-circuit fault is removed, the ADC module can quickly feed back the state to the inside of the single chip microcomputer, and then the output voltage of the DAC is gradually increased so as to increase the output voltage of the OPA549 until the short-circuit fault is recovered to a state without short circuit.
Claims (6)
1. The utility model provides an overcurrent protection and automatic recovery normal power supply circuit based on singlechip, its characterized in that, includes singlechip and the power short-circuit protection and the quick recovery circuit of being connected with the singlechip, power short-circuit protection and quick recovery circuit are including the voltage follower U1, differential amplifier U3, sampling circuit and the voltage follower U2 that connect gradually, the input of voltage follower U1 is connected with the DAC output of singlechip, the output of voltage follower U2 is connected with the ADC input of singlechip.
2. The overcurrent protection and automatic normal-recovery power supply circuit based on the single chip microcomputer according to claim 1, wherein the type of the single chip microcomputer is ADuC 812.
3. The circuit of claim 2, wherein the 1 st pin of the single chip is an input terminal of an ADC, the 5 th pin of the single chip is respectively connected to one end of a capacitor C31, an anode of a polar capacitor C28 and one end of a capacitor C27, and is connected to a voltage of 5V, the 6 th pin of the single chip is respectively connected to the other end of a capacitor C31, one end of a capacitor C30, one end of a capacitor C29, a cathode of a polar capacitor C28 and the other end of a capacitor C27, and is grounded, the 7 th pin of the single chip is connected to the other end of a capacitor C30, the 8 th pin of the single chip is connected to the other end of a capacitor C29, the 9 th pin of the single chip is an output terminal of a DAC, the 15 th pin of the single chip is respectively connected to a cathode of a polar capacitor C15 and a ground resistor R23, the 20 th pin of the single chip is respectively connected to an anode of a polar capacitor C15 and a ground capacitor C39, and the 21 st pin of the single chip microcomputer is connected with the ground, the 32 nd pin of the single chip microcomputer is respectively connected with one end of a crystal oscillator Y1 and a grounded capacitor C34, the 33 th pin of the single chip microcomputer is respectively connected with the other end of a crystal oscillator Y1 and a grounded capacitor C35, the 34 th pin of the single chip microcomputer is connected with the grounded capacitor C33 and connected with the 5V voltage, the 35 th pin of the single chip microcomputer is connected with the ground, the 47 th pin of the single chip microcomputer is connected with the ground, and the 48 th pin of the single chip microcomputer is connected with the grounded capacitor C32 and connected with the 5V voltage.
4. The single-chip microcomputer-based over-current protection and automatic normal power restoration circuit as claimed in claim 1, wherein the voltage follower U1 and the voltage follower U2 are both in model of OP284, and the differential amplifier U3 is in model of OPA 594.
5. The single-chip microcomputer-based over-current protection and automatic normal power restoration circuit as claimed in claim 4, wherein the sampling circuit comprises a resistor R4 and a resistor R5 connected in parallel.
6. The over-current protection and automatic normal power restoration circuit based on the single chip microcomputer according to claim 5, wherein the DAC output terminal is connected to 2 terminals of a voltage follower U1, 1 terminal of the voltage follower U1 is connected to 3 terminals of a voltage follower U1 and one terminal of a resistor R2 respectively, 4 terminals of the voltage follower U1 are connected to a grounding capacitor C42 and 5V voltage respectively, 5 terminals of the voltage follower U1 are connected to ground, the other terminal of the resistor R2 is connected to 2 terminals of a differential amplifier U3, 3 terminals of the differential amplifier U3 are connected to the grounding resistor R1, a 1 fixed terminal of a sliding rheostat RP1 and a sliding terminal of the sliding rheostat RP1 respectively, 4 terminals of the differential amplifier U3 are connected to a positive terminal of a polar capacitor C41 and 35V DC regulated power supply, a negative terminal of the polar capacitor C41 is connected to ground, 5 terminals and 7 terminals of the differential amplifier U3 are connected to ground respectively, the 6 ends of the differential amplifier U3 are suspended, the 8 ends of the differential amplifier U3 are connected with a grounding resistor R3, the 1 end of the differential amplifier U3 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the 2 nd fixed end of a sliding rheostat RP1 and one end of a resistor R5 respectively and serves as a direct-current voltage output end, the ADC input end is connected with the 1 end of a voltage follower U2 and the 3 end of a voltage follower U2 respectively, the 4 end of the voltage follower U2 is connected with 5V voltage, the 5 end of the voltage follower U2 is grounded, and the 2 end of the voltage follower U2 is connected with the other end of a resistor R5 and a grounding resistor R6 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921908382.2U CN210629092U (en) | 2019-11-06 | 2019-11-06 | Overcurrent protection and automatic normal power supply recovery circuit based on single chip microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921908382.2U CN210629092U (en) | 2019-11-06 | 2019-11-06 | Overcurrent protection and automatic normal power supply recovery circuit based on single chip microcomputer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210629092U true CN210629092U (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921908382.2U Expired - Fee Related CN210629092U (en) | 2019-11-06 | 2019-11-06 | Overcurrent protection and automatic normal power supply recovery circuit based on single chip microcomputer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210629092U (en) |
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2019
- 2019-11-06 CN CN201921908382.2U patent/CN210629092U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200526 Termination date: 20211106 |
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| CF01 | Termination of patent right due to non-payment of annual fee |