CN210745018U - Far-end voltage stabilizing circuit for output of switching power supply - Google Patents
Far-end voltage stabilizing circuit for output of switching power supply Download PDFInfo
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- CN210745018U CN210745018U CN201921949646.9U CN201921949646U CN210745018U CN 210745018 U CN210745018 U CN 210745018U CN 201921949646 U CN201921949646 U CN 201921949646U CN 210745018 U CN210745018 U CN 210745018U
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Abstract
The disclosure belongs to the technical field of electric power, and particularly relates to a far-end voltage stabilizing circuit for output of a switching power supply. In the embodiment of the disclosure, the first triode, the second triode and the third triode are turned off when the power supply voltage is stable, the second capacitor is the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor are charged, the first capacitor drives the first triode in sequence along with the fluctuation of the power supply voltage, the second triode and the third triode are conducted, and further the second capacitor is the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor are charged for the output end, therefore, when the load changes, the voltage of the load end can be stabilized within a certain range, and reliable power supply is realized.
Description
Technical Field
The utility model belongs to the technical field of electric power, concretely relates to a distal end voltage stabilizing circuit for switching power supply output.
Background
Generally, there is a requirement for long-distance power supply, and the output quality of the power supply needs to meet a certain requirement to ensure the reliability of power supply, but when the voltage at the load terminal fluctuates, the voltage of the power supply fluctuates to affect the load terminal, so how to reduce the influence of the voltage fluctuation at the load terminal on the voltage of the power supply becomes an urgent technical problem to be solved.
SUMMERY OF THE UTILITY MODEL
To overcome the problems in the related art, a remote voltage stabilizing circuit for switching power supply output is provided.
According to an aspect of the embodiments of the present disclosure, there is provided a far-end voltage stabilizing circuit for a switching power supply output, the far-end voltage stabilizing circuit for the switching power supply output including: the circuit comprises a first resistor, a second resistor, a third resistor, a first diode, a second diode, a first triode, a second triode, a third triode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor;
the first triode and the third triode are NPN type, and the second triode is PNP type;
the first resistor is connected with a power supply, the first resistor is connected with the anode of the first diode, the cathode of the first diode is connected with the anode of the second diode, and the cathode of the second diode is grounded;
the second resistor is connected with a power supply, the base electrode of the first triode is connected between the first resistor and the first diode, the collector electrode of the first triode is connected with the second resistor, the emitter electrode of the first triode is connected with the third resistor, the third resistor is grounded, and the resistance value of the second resistor is smaller than that of the third resistor;
the positive electrode of the first capacitor is connected with a power supply, and the negative electrode of the first capacitor is connected between the emitting electrode of the first triode and the third resistor;
an emitting electrode of the second triode is connected with a power supply, and a base electrode of the second triode is connected between the second resistor and a collector electrode of the first triode;
a collector of the third triode is connected with the power supply, a base of the third triode is connected with an emitter of the second triode, and the emitter of the third triode is grounded;
the anodes of the second capacitor and the third capacitor are respectively connected with a power supply, and the cathodes of the second capacitor and the third capacitor are respectively grounded;
and the anodes of the fourth capacitor and the fifth capacitor are respectively connected with a power supply, and the cathodes of the second capacitor and the third capacitor are respectively grounded.
In one possible implementation manner, the remote voltage stabilizing circuit for switching power supply output further includes: and the anode of the sixth capacitor is connected with a power supply, and the cathode of the sixth capacitor is grounded.
In one possible implementation, the second capacitor and the third capacitor are connected in parallel.
In one possible implementation, the fourth capacitor and the fifth capacitor are connected in parallel.
The beneficial effects of the utility model reside in that: the embodiment of the disclosure can stabilize the voltage of the load terminal within a certain range when the load changes, thereby realizing reliable power supply.
Drawings
FIG. 1 illustrates a remote voltage regulator circuit for switching power supply output according to an exemplary embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 illustrates a remote voltage regulator circuit for switching power supply output according to an exemplary embodiment. As shown in fig. 1, a remote voltage stabilizing circuit for switching power supply output, the remote voltage stabilizing circuit for switching power supply output includes: a first resistor R1, a second resistor R2, a third resistor R3, a first diode V1, a second diode V2, a first triode Q1, a second triode Q2, a third triode Q3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5; the first triode Q1 and the third triode Q3 are NPN type, and the second triode Q2 is PNP type; the first resistor R1 is connected with a power supply, the first resistor R1 is connected with the anode of the first diode V1, the cathode of the first diode V1 is connected with the anode of the second diode V2, and the cathode of the second diode V2 is grounded; the second resistor R2 is connected with a power supply, the base electrode of the first triode Q1 is connected between the first resistor R1 and the first diode V1, the collector electrode of the first triode Q1 is connected with the second resistor R2, the emitter electrode of the first triode Q1 is connected with the third resistor R3, the third resistor R3 is grounded, and the resistance value of the second resistor R2 is smaller than that of the third resistor R3; the positive electrode of the first capacitor C1 is connected with the power supply, and the negative electrode of the first capacitor C1 is connected between the emitter of the first triode Q1 and the third resistor R3; the emitter of the second triode Q2 is connected with the power supply, and the base of the second triode Q2 is connected between the second resistor R2 and the collector of the first triode Q1; the collector of the third triode Q3 is connected with the power supply, the base of the third triode Q3 is connected with the emitter of the second triode Q2, and the emitter of the third triode Q3 is grounded; the anodes of the second capacitor C2 and the third capacitor C3 are respectively connected with a power supply, and the cathodes of the second capacitor C2 and the third capacitor C3 are respectively grounded; the anodes of the fourth capacitor C4 and the fifth capacitor C5 are respectively connected with the power supply, and the cathodes of the second capacitor C2 and the third capacitor C3 are respectively grounded.
Under the condition of stable power supply voltage, a voltage division network consisting of the first resistor R1, the first diode V1 and the second diode V2 can provide a bias voltage for the base of the first triode Q1. When the first transistor Q1 is turned on, a voltage drop is formed across the third resistor R3, which forms a second bias voltage for the first transistor Q1. The currents flowing through the second resistor R2 and the third resistor R3 are almost equal, and a third bias voltage is formed on the first resistor R1, because the resistance of the second resistor R2 is smaller than that of the third resistor R3, the bias voltage value on the second resistor R2 can be smaller than that on the third resistor R3. Thus, in the case where the power supply voltage is smoothed, the first transistor Q1, the second transistor Q2, and the third transistor Q3 are turned off.
In addition, in the case that the power supply voltage is stable, the first capacitor C1 can be charged, and in the case that the first capacitor C1 is fully charged, the voltage of the negative terminal of the first capacitor C1 will be equal to the voltage of the emitter of the first triode Q1; the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 may also be charged separately.
In the case of a transient of the power supply voltage, the occurrence of a transient current of the power supply will cause the power supply output voltage to decrease, and the voltage of the negative terminal of the first capacitor C1 will decrease with the decrease of the power supply output voltage, which will cause the voltage of the emitter of the first transistor Q1 to become negative, which will cause the first transistor Q1 to be turned on, which will cause the second transistor Q2 to be turned on after the first transistor Q1 is turned on, and which will cause the third transistor Q3 to be turned on after the second transistor Q2 is turned on. And then the parallel module formed by the second capacitor C2 and the third capacitor C3 and the parallel module formed by the fourth capacitor C4 and the fifth capacitor C5 are connected in series, and provide a driving current for the output end to prevent the terminal voltage from further decreasing, that is, the charges on the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are used to maintain the stability of the terminal voltage.
In one possible implementation, the remote voltage stabilizing circuit for switching power supply output may further include: and a sixth capacitor C6, wherein the anode of the sixth capacitor C6 may be connected to the power supply, and the cathode of the sixth capacitor C6 may be grounded. The sixth capacitor C6 can be charged when the power supply voltage is stable, and can maintain the output voltage during the non-conduction of the third transistor Q3.
In the embodiment of the disclosure, the first triode, the second triode and the third triode are turned off when the power supply voltage is stable, the second capacitor is the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor are charged, the first capacitor drives the first triode in sequence along with the fluctuation of the power supply voltage, the second triode and the third triode are conducted, and further the second capacitor is the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor are charged for the output end, therefore, when the load changes, the voltage of the load end can be stabilized within a certain range, and reliable power supply is realized.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (4)
1. A remote voltage stabilizing circuit for a switching power supply output, the remote voltage stabilizing circuit for a switching power supply output comprising: the circuit comprises a first resistor, a second resistor, a third resistor, a first diode, a second diode, a first triode, a second triode, a third triode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor;
the first triode and the third triode are NPN type, and the second triode is PNP type;
the first resistor is connected with a power supply, the first resistor is connected with the anode of the first diode, the cathode of the first diode is connected with the anode of the second diode, and the cathode of the second diode is grounded;
the second resistor is connected with a power supply, the base electrode of the first triode is connected between the first resistor and the first diode, the collector electrode of the first triode is connected with the second resistor, the emitter electrode of the first triode is connected with the third resistor, the third resistor is grounded, and the resistance value of the second resistor is smaller than that of the third resistor;
the positive electrode of the first capacitor is connected with a power supply, and the negative electrode of the first capacitor is connected between the emitting electrode of the first triode and the third resistor;
an emitting electrode of the second triode is connected with a power supply, and a base electrode of the second triode is connected between the second resistor and a collector electrode of the first triode;
a collector of the third triode is connected with the power supply, a base of the third triode is connected with an emitter of the second triode, and the emitter of the third triode is grounded;
the anodes of the second capacitor and the third capacitor are respectively connected with a power supply, and the cathodes of the second capacitor and the third capacitor are respectively grounded;
and the anodes of the fourth capacitor and the fifth capacitor are respectively connected with a power supply, and the cathodes of the second capacitor and the third capacitor are respectively grounded.
2. The remote voltage regulator circuit for a switching power supply output of claim 1, further comprising: and the anode of the sixth capacitor is connected with a power supply, and the cathode of the sixth capacitor is grounded.
3. The remote voltage regulation circuit for a switching power supply output of claim 1, wherein the second capacitor and the third capacitor are connected in parallel.
4. The remote voltage regulation circuit for a switching power supply output of claim 1, wherein the fourth capacitor and the fifth capacitor are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921949646.9U CN210745018U (en) | 2019-11-12 | 2019-11-12 | Far-end voltage stabilizing circuit for output of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921949646.9U CN210745018U (en) | 2019-11-12 | 2019-11-12 | Far-end voltage stabilizing circuit for output of switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210745018U true CN210745018U (en) | 2020-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921949646.9U Active CN210745018U (en) | 2019-11-12 | 2019-11-12 | Far-end voltage stabilizing circuit for output of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210745018U (en) |
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2019
- 2019-11-12 CN CN201921949646.9U patent/CN210745018U/en active Active
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