CN211127613U - Autonomous linear power supply - Google Patents
Autonomous linear power supply Download PDFInfo
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- CN211127613U CN211127613U CN201921965302.7U CN201921965302U CN211127613U CN 211127613 U CN211127613 U CN 211127613U CN 201921965302 U CN201921965302 U CN 201921965302U CN 211127613 U CN211127613 U CN 211127613U
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Abstract
The utility model provides an autonomous linear power supply, which comprises a rectification filter circuit, a voltage stabilizing circuit, a first switch tube Q1, a protection circuit, an output voltage regulator, a reference power supply and an auxiliary power supply; the voltage stabilizing circuit is used for comparing the load voltage, the current output by the rectifying and filtering circuit with a first reference voltage and a reference current output by the reference power supply and outputting corresponding signals to control the first switching tube Q1; the first switching tube Q1 is used for switching according to the signal output by the voltage stabilizing circuit, thereby changing the output voltage; the protection circuit is used for protecting the circuit and automatically adjusting the protection time by controlling the first switching tube Q1 when the circuit is short-circuited; voltage regulators are used to fine tune output voltages by varying input voltages. Based on the mutual matching of the modules, the working state of the linear power supply can be more stable.
Description
Technical Field
The utility model relates to a linear power supply technical field, concretely relates to independently linear power supply.
Background
The linear power supply is a power supply which firstly reduces the voltage amplitude of alternating current through a transformer, then obtains pulse direct current after rectification through a rectifying circuit, then obtains direct current voltage with micro ripple voltage through filtering, and outputs the direct current voltage, and when specific needs exist, voltage stabilization is carried out through a voltage stabilizing circuit. As a kind of power supply commonly used in electronic technology, the output stability is a non-negligible one, and when a load circuit is in a condition during operation, how to better self-protect and regulate the power supply is also very important.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide an energy-saving dust remover of energy saving and emission reduction dust removal integration.
The utility model provides a its technical problem take following technical scheme to realize:
the utility model provides an autonomous linear power supply, which comprises a rectification filter circuit, a voltage stabilizing circuit, a first switch tube Q1, a protection circuit, an output voltage regulator, a reference power supply and an auxiliary power supply;
the rectification filter circuit is connected with the alternating current power supply and the load and used for converting the received alternating current into direct current with low ripples and outputting the direct current to the load;
the voltage stabilizing circuit is connected with the rectifying and filtering circuit, the reference power supply and the first switch tube Q1 and is used for comparing the load voltage, the current output by the rectifying and filtering circuit and the first reference voltage and the reference current output by the reference power supply and outputting corresponding signals to control the first switch tube Q1;
the first switch tube Q1 is connected between the positive pole of the AC power supply and the positive pole of the load, and the first switch tube Q1 is used for switching according to the signal output by the voltage stabilizing circuit, so as to change the output voltage;
the protection circuit is connected with the rectification filter circuit, the reference power supply and the first switching tube Q1 and is used for protecting the circuit and automatically adjusting the protection time by controlling the first switching tube Q1 when the circuit is short-circuited;
the voltage regulator is connected with the rectifying and filtering circuit, the voltage stabilizing circuit and the protection circuit and is used for finely adjusting output voltage by changing input direct current;
the auxiliary power supply is used for providing power for the rectifying and filtering circuit, the voltage stabilizing circuit, the first switching tube Q1, the protection circuit and the output voltage regulator.
Preferably, the voltage stabilizing circuit comprises a voltage comparing unit and a current comparing unit;
the voltage comparison unit comprises a first voltage comparator U1, wherein the positive input end of the first voltage comparator U1 is connected between the rectifying and filtering circuit and the negative electrode of the load, and the negative input end of the first voltage comparator U1 is connected with the reference power supply and is used for comparing the load voltage with a first reference voltage output by the reference power supply and outputting a corresponding signal;
the current comparison unit comprises a second voltage comparator U2 and a second switch tube Q2, wherein the positive input end of the second voltage comparator U2 is connected between the rectifying and filtering circuit and the positive pole of the load, the negative input end of the second voltage comparator U2 is connected with the reference power supply, and the output end of the second voltage comparator U2 is connected with the second switch tube Q2 and is used for comparing the current output by the rectifying and filtering circuit with the reference current output by the reference power supply and outputting a signal to control the second switch tube Q2.
Preferably, the first switch tube Q1 is connected to the output end of the first voltage comparator U1 and the second switch tube Q2 through a third switch tube Q3, and is configured to change its on-off state through the signal output by the first voltage comparator U1 and the on-off state of the second switch tube Q2.
Preferably, the protection circuit comprises a third voltage comparator U3, a fourth voltage comparator U4, a fifth switching tube Q5;
the positive input end of the third voltage comparator U3 is connected between the rectifying and filtering circuit and the negative electrode of the load, and the negative input end is connected with the reference power supply, and is used for comparing the load voltage with a second reference voltage output by the reference power supply and outputting a corresponding signal;
the positive input end of the fourth voltage comparator U4 is connected with a reference power supply, the negative input end of the fourth voltage comparator U4 is connected with the output end of the third voltage comparator U3 through a diode D3, and the fourth voltage comparator U4 is used for comparing a signal output by the third voltage comparator U3 with a third reference voltage output by the reference power supply and outputting a corresponding signal;
the base of the fifth switching tube Q5 is connected to the output terminal of the fourth voltage comparator U4 through a fourth switching tube Q4, and the collector and emitter of the fifth switching tube Q5 are connected to the first switching tube Q1, so as to control the switching of the switching tube Q5 according to the signal output by the fourth voltage comparator U4, thereby implementing circuit protection.
Preferably, a plurality of voltage dividing resistors are arranged between the negative electrode of the load and the voltage stabilizing circuit and the protection circuit, the output voltage regulator includes a potentiometer, and the output voltage regulator is connected in parallel between the voltage dividing resistors and is configured to perform fine tuning on the input voltages at the positive input end of the third voltage comparator U3 and the positive input end of the first voltage comparator U1 by changing voltages at two ends of the voltage dividing resistors.
The utility model has the advantages that:
the utility model provides an autonomous linear power supply, which comprises a rectification filter circuit, a voltage stabilizing circuit, a first switch tube Q1, a protection circuit, an output voltage regulator, a reference power supply and an auxiliary power supply; the voltage stabilizing circuit is used for comparing the load voltage, the current output by the rectifying and filtering circuit with a first reference voltage and a reference current output by a reference power supply and outputting corresponding signals to control a first switching tube Q1; the first switching tube Q1 is used for switching according to the signal output by the voltage stabilizing circuit, so as to change the output voltage; the protection circuit is used for protecting the circuit and automatically adjusting the protection time by controlling the first switching tube Q1 when the circuit is short-circuited; the voltage regulator is used for fine-tuning an output voltage by changing an input voltage. Based on the mutual matching of the modules, the working state of the linear power supply can be more stable.
Drawings
Fig. 1 is a block diagram of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
For a better understanding of the present invention, the following further description is given in conjunction with the following embodiments and accompanying drawings.
As shown in fig. 1 and 2, the present invention provides an autonomous linear power supply, which includes a rectifying filter circuit, a voltage regulator circuit, a first switch tube Q1, a protection circuit, an output voltage regulator, a reference power supply, and an auxiliary power supply;
the rectification filter circuit is connected with the alternating current power supply and the load and used for converting the received alternating current into direct current with low ripples and outputting the direct current to the load;
the voltage stabilizing circuit is connected with the rectifying and filtering circuit, the reference power supply and the first switch tube Q1 and is used for comparing the load voltage, the current output by the rectifying and filtering circuit and the first reference voltage and the reference current output by the reference power supply and outputting corresponding signals to control the first switch tube Q1;
the first switch tube Q1 is connected between the positive pole of the AC power supply and the positive pole of the load, and the first switch tube Q1 is used for switching according to the signal output by the voltage stabilizing circuit, so as to change the output voltage;
the protection circuit is connected with the rectification filter circuit, the reference power supply and the first switching tube Q1 and is used for protecting the circuit and automatically adjusting the protection time by controlling the first switching tube Q1 when the circuit is short-circuited;
the voltage regulator is connected with the rectifying and filtering circuit, the voltage stabilizing circuit and the protection circuit and is used for finely adjusting output voltage by changing input direct current;
the auxiliary power supply is used for providing power for the rectifying and filtering circuit, the voltage stabilizing circuit, the first switching tube Q1, the protection circuit and the output voltage regulator.
Further, as shown in fig. 2, the voltage stabilizing circuit includes a voltage comparing unit and a current comparing unit;
the voltage comparison unit comprises a first voltage comparator U1, a positive input end of the first voltage comparator U1 is connected between the rectifying and filtering circuit and the negative electrode of the load, a negative input end of the first voltage comparator U1 is connected with the reference power supply, and particularly connected between a first reference voltage-dividing resistor R9 and a second reference voltage-dividing resistor R10, and the first voltage comparator U1 is used for comparing the load voltage with a first reference voltage output by the reference power supply and outputting a corresponding signal;
the current comparison unit comprises a second voltage comparator U2 and a second switch tube Q2, wherein a positive input end of the second voltage comparator U2 is connected between the rectifying and filtering circuit and the positive pole of the load, specifically connected with the emitting stage of the first switch tube Q1, a negative input end of the second voltage comparator U2 is connected with the reference power supply, specifically connected between the third reference voltage-dividing resistor R7 and the fourth reference voltage-dividing resistor R8, and an output end of the second switch tube Q2 is connected and used for comparing the current output by the rectifying and filtering circuit with the reference current output by the reference power supply and outputting a signal to control the second switch tube Q2.
Further, as shown in fig. 2, the first switch tube Q1 is connected to the output terminal of the first voltage comparator U1 and the second switch tube Q2 through a third switch tube Q3, and is configured to change the self on-off state through the signal output by the first voltage comparator U1 and the on-off state of the second switch tube Q2.
Specifically, the first voltage comparator U1 compares the load voltage with the first reference voltage outputted by the reference power source, when the load voltage is greater than the first reference voltage outputted by the reference power source, the output terminal of the first voltage comparator U1 outputs a high level, the third switching tube Q3 is turned on, so that the first switching tube Q1 is turned on, and the voltage is normally inputted to the load, the emitter of the first switching tube Q1 is connected to the second voltage comparator U2, the second voltage comparator U2 compares the load current with the reference current outputted by the reference power source, when the overcurrent occurs, the output terminal of the second voltage comparator U2 is high, the second switching tube Q2 is turned on, so that the third switching tube Q3 is turned off, that is, the first switching tube Q1 is also turned off, so that the voltage and the current inputted to the load are changed, and enter a protection state, when the overcurrent disappears, the positive input end voltage of the second voltage comparator U2 is smaller than the negative input end voltage, the second switch tube Q2 is cut off, the first switch tube is conducted, and based on the mutual cooperation of the above components, the effects of changing the output voltage and overcurrent protection can be achieved.
Further, as shown in fig. 2, the protection circuit includes a third voltage comparator U3, a fourth voltage comparator U4, a fifth switching tube Q5;
a positive input end of the third voltage comparator U3 is connected between the rectification filter circuit and the negative electrode of the load, and a negative input end thereof is connected to the reference power supply, and is specifically connected between the fifth reference voltage-dividing resistor R4 and the sixth reference voltage-dividing resistor R5, and is configured to compare the load voltage with a second reference voltage output by the reference power supply and output a corresponding signal, and it is to be supplemented that an output end of the third voltage comparator U3 is connected to a protection capacitor C9;
a positive input end of the fourth voltage comparator U4 is connected to a reference power supply, specifically connected between the seventh reference voltage-dividing resistor R17 and the eighth reference voltage-dividing resistor R18, and a negative input end is connected to an output end of the third voltage comparator U3 through a diode D3, and is configured to compare a signal output by the third voltage comparator U3 with a third reference voltage output by the reference power supply and output a corresponding signal;
the base of the fifth switching tube Q5 is connected to the output terminal of the fourth voltage comparator U4 through a fourth switching tube Q4, and the collector and emitter of the fifth switching tube Q5 are connected to the first switching tube Q1, so as to control the switching of the switching tube Q5 according to the signal output by the fourth voltage comparator U4, thereby implementing circuit protection.
Specifically, when the load circuit is recovered in a short-circuit condition, the load voltage is too low at this time, that is, the voltage at the positive input end of the third voltage comparator U3 is lower than that at the negative input end, the output end of the third voltage comparator U3 outputs a low level, the protection capacitor C9 connected to the output end of the third voltage comparator U3 discharges, the diode D3 is turned on, so that the negative input end of the fourth voltage comparator U4 is lower than that at the positive input end, the output end of the fourth voltage comparator U4 outputs a high level, the fourth switching tube Q4 is turned on, and the fifth switching tube Q5 is turned off, so that the first switching tube Q1 is turned on, the load voltage rises, and the effect of accelerated recovery of short-circuit protection is achieved; after the recovery process is carried out for a period of time, the voltage of the positive input end of the third voltage comparator U3 is higher than that of the negative input end, the output end of the third voltage comparator U3 outputs a high level, the protection capacitor C9 connected with the output end of the third voltage comparator U3 is charged, the diode D3 is cut off, the voltage of the negative input end of the fourth voltage comparator U4 is higher than that of the positive input end, the output end of the fourth voltage comparator U4 outputs a low level, the fourth switching tube Q4 is cut off, the fifth switching tube Q5 is turned on, the Q5 is cut off, the load voltage is reduced, the time for the circuit to recover from the short-circuit condition is controlled, and therefore, the stable voltage can be output quickly, and the protection circuit can self-regulate quickly when the circuit is short-circuited through the cooperation of the above components.
Further, as shown in fig. 2, a plurality of voltage dividing resistors, specifically, a first voltage dividing resistor R14, a second voltage dividing resistor R15, a third voltage dividing resistor R16, and a fourth voltage dividing resistor R27 are disposed between the negative electrode of the load and the voltage stabilizing circuit and the protection circuit, the output voltage regulator includes a potentiometer, and the output voltage regulator is connected in parallel between the voltage dividing resistors, specifically, connected in parallel between two ends of the fourth voltage dividing resistor R27, and is configured to perform fine tuning on the input voltages at the positive input end of the third voltage comparator U3 and the positive input end of the first voltage comparator U1 by changing voltages at two ends of the voltage dividing resistors, so as to change output levels of the first voltage comparator U1 and the third voltage comparator U3, thereby implementing a fine tuning effect on the output voltage, and enabling output of the linear power supply to be more stable and accurate.
Specifically, in an embodiment of the present invention, the rectification filter circuit is connected to an ac power supply and a load, and is configured to convert a received ac power into a dc power with low ripple and output the dc power to the load, and the voltage stabilizing circuit includes a voltage comparing unit and a current comparing unit; the voltage comparison unit compares the load voltage with a first reference voltage output by a reference power supply and outputs a corresponding signal to control the opening and closing of the first switch tube Q1 through a third switch tube Q3, the current comparison unit is used for comparing the current output by the rectifying filter circuit with the reference current output by the reference power supply, and when an overcurrent condition occurs, the current comparison unit controls the cut-off of the first switch tube Q1 through a second switch tube Q2 to protect; when the load circuit is recovered due to a short-circuit condition, the third voltage comparator U3 of the protection circuit compares the load voltage with the second reference voltage outputted from the reference power supply, outputs a response signal to the fourth voltage comparator U4, the fourth voltage comparator U4 receives the signal and compares it with the third reference voltage outputted by the reference power supply, the output signal controls the on/off of the fifth switch tube Q5 through the fourth switch tube Q4, thereby controlling the opening and closing of the first switch tube Q1, realizing the protection and recovery time adjustment, the output voltage regulator is used for changing the voltage at two ends of the voltage dividing resistor, the input voltages at the positive input of the third voltage comparator U3 and the positive input of the first voltage comparator U1 are trimmed, therefore, the fine adjustment of the output voltage is realized, and the output of the linear power supply is more stable and accurate.
It should be emphasized that the embodiments described herein are illustrative and not restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also falls within the scope of the present invention, in any other embodiments derived by those skilled in the art according to the technical solutions of the present invention.
Claims (5)
1. An autonomous linear power supply, characterized by: the power supply comprises a rectification filter circuit, a voltage stabilizing circuit, a first switching tube Q1, a protection circuit, an output voltage regulator, a reference power supply and an auxiliary power supply;
the rectification filter circuit is connected with the alternating current power supply and the load and used for converting the received alternating current into direct current with low ripples and outputting the direct current to the load;
the voltage stabilizing circuit is connected with the rectifying and filtering circuit, the reference power supply and the first switch tube Q1 and is used for comparing the load voltage, the current output by the rectifying and filtering circuit and the first reference voltage and the reference current output by the reference power supply and outputting corresponding signals to control the first switch tube Q1;
the first switch tube Q1 is connected between the positive pole of the AC power supply and the positive pole of the load, and the first switch tube Q1 is used for switching according to the signal output by the voltage stabilizing circuit, so as to change the output voltage;
the protection circuit is connected with the rectification filter circuit, the reference power supply and the first switching tube Q1 and is used for protecting the circuit and automatically adjusting the protection time by controlling the first switching tube Q1 when the circuit is short-circuited;
the voltage regulator is connected with the rectifying and filtering circuit, the voltage stabilizing circuit and the protection circuit and is used for finely adjusting output voltage by changing input direct current;
the auxiliary power supply is used for providing power for the rectifying and filtering circuit, the voltage stabilizing circuit, the first switching tube Q1, the protection circuit and the output voltage regulator.
2. The autonomous linear power supply of claim 1, wherein: the voltage stabilizing circuit comprises a voltage comparing unit and a current comparing unit;
the voltage comparison unit comprises a first voltage comparator U1, wherein the positive input end of the first voltage comparator U1 is connected between the rectifying and filtering circuit and the negative electrode of the load, and the negative input end of the first voltage comparator U1 is connected with the reference power supply and is used for comparing the load voltage with a first reference voltage output by the reference power supply and outputting a corresponding signal;
the current comparison unit comprises a second voltage comparator U2 and a second switch tube Q2, wherein the positive input end of the second voltage comparator U2 is connected between the rectifying and filtering circuit and the positive pole of the load, the negative input end of the second voltage comparator U2 is connected with the reference power supply, and the output end of the second voltage comparator U2 is connected with the second switch tube Q2 and is used for comparing the current output by the rectifying and filtering circuit with the reference current output by the reference power supply and outputting a signal to control the second switch tube Q2.
3. The autonomous linear power supply of claim 2, wherein: the first switch tube Q1 is connected with the output end of the first voltage comparator U1 and the second switch tube Q2 through a third switch tube Q3, and is used for changing the self open and close state through the signal output by the first voltage comparator U1 and the open and close of the second switch tube Q2.
4. The autonomous linear power supply of claim 3, wherein: the protection circuit comprises a third voltage comparator U3, a fourth voltage comparator U4 and a fifth switching tube Q5;
the positive input end of the third voltage comparator U3 is connected between the rectifying and filtering circuit and the negative electrode of the load, and the negative input end is connected with the reference power supply, and is used for comparing the load voltage with a second reference voltage output by the reference power supply and outputting a corresponding signal;
the positive input end of the fourth voltage comparator U4 is connected with a reference power supply, the negative input end of the fourth voltage comparator U4 is connected with the output end of the third voltage comparator U3 through a diode D3, and the fourth voltage comparator U4 is used for comparing a signal output by the third voltage comparator U3 with a third reference voltage output by the reference power supply and outputting a corresponding signal;
the base of the fifth switching tube Q5 is connected to the output terminal of the fourth voltage comparator U4 through a fourth switching tube Q4, and the collector and emitter of the fifth switching tube Q5 are connected to the first switching tube Q1, so as to control the switching of the switching tube Q5 according to the signal output by the fourth voltage comparator U4, thereby implementing circuit protection.
5. The autonomous linear power supply of claim 4, wherein: and a plurality of voltage division resistors are arranged between the negative electrode of the load and the voltage stabilizing circuit and the protection circuit, the output voltage regulator comprises a potentiometer, and the output voltage regulator is connected in parallel between the voltage division resistors and is used for finely adjusting the input voltage of the positive input end of the third voltage comparator U3 and the input voltage of the positive input end of the first voltage comparator U1 by changing the voltage at two ends of the voltage division resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921965302.7U CN211127613U (en) | 2019-11-14 | 2019-11-14 | Autonomous linear power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921965302.7U CN211127613U (en) | 2019-11-14 | 2019-11-14 | Autonomous linear power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211127613U true CN211127613U (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921965302.7U Active CN211127613U (en) | 2019-11-14 | 2019-11-14 | Autonomous linear power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211127613U (en) |
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2019
- 2019-11-14 CN CN201921965302.7U patent/CN211127613U/en active Active
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