CN215897590U - Voltage stabilizing circuit for switching power supply - Google Patents
Voltage stabilizing circuit for switching power supply Download PDFInfo
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- CN215897590U CN215897590U CN202122107074.3U CN202122107074U CN215897590U CN 215897590 U CN215897590 U CN 215897590U CN 202122107074 U CN202122107074 U CN 202122107074U CN 215897590 U CN215897590 U CN 215897590U
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Abstract
The utility model discloses a voltage stabilizing circuit for a switching power supply, which comprises a switching power supply U1, a booster circuit and a bypass voltage stabilizing circuit, wherein the switching power supply U1 is electrically connected with the booster circuit, the booster circuit is electrically connected with the bypass voltage stabilizing circuit, and the bypass voltage stabilizing circuit is electrically connected with a rectifier bridge. According to the booster circuit arranged by the voltage stabilizing circuit for the switching power supply, the triode Q1 is electrically connected with the capacitor C1 in parallel, so that the switching power supply U1 is matched with the triode Q1 to charge the capacitor C1, the booster circuit is connected to the power supply voltage pin VCC of the switching power supply U1, the capacitor C1 can be discharged again to increase the power supply voltage, the booster transistor Q1 is matched with the adjustable resistor R5 to adjust the boosting size, and the booster circuit can be used for stably releasing the voltage by being matched with the diode ZD2, the capacitor C2 and the resistor R3; the filter A1 can effectively filter the frequency point of the specific frequency in the lead led out by the booster circuit or the frequencies except the frequency point to obtain a power signal of the specific frequency, thereby realizing the stable power supply of the switch power supply U1.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a voltage stabilizing circuit for a switching power supply.
Background
With the high-speed development of power electronic technology, the power electronic equipment has increasingly close relationship with the work and life of people, electronic equipment can not be switched off from a reliable power supply, the power supply of computers in the 80 s is comprehensively changed into a switching power supply, the power supply of computers is firstly replaced, the switching power supply enters the fields of various electronic and electrical equipment in the 90 s, the switching power supply is widely used in a program-controlled exchanger, a communication, an electronic detection equipment power supply, a control equipment power supply and the like, and the rapid development of the switching power supply technology is promoted.
The voltage stabilizing circuit of the conventional switching power supply is easily interfered by circuit voltage, and the output voltage is inconvenient to adjust.
SUMMERY OF THE UTILITY MODEL
The present invention provides a voltage regulator circuit for a switching power supply, so as to solve the problems that the voltage regulator circuit of the conventional switching power supply is easily interfered by circuit voltage and the output voltage is inconvenient to regulate in the background art.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a voltage stabilizing circuit for switching power supply, includes switching power supply U1, boost circuit and bypass voltage stabilizing circuit, switching power supply U1 electricity is connected with boost circuit, boost circuit electricity is connected with bypass voltage stabilizing circuit, bypass voltage stabilizing circuit electricity is connected with the rectifier bridge.
Preferably, a power supply voltage pin VCC of the switching power supply U1 is electrically connected with a zener diode ZD1 through a wire, and the other end of the diode ZD1 is electrically connected to a wire led out from a ground pin GND of the switching power supply U1.
Preferably, the boost circuit comprises a triode Q1, a zener diode D2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, and an adjustable resistor R5, wherein a lead at one end of the triode Q1 is connected to a lead led out from a supply voltage pin VCC of the switching power supply U1, a lead led out from the other end of the triode Q1 is electrically connected to the resistor R2, and the resistor R2 is grounded through a lead.
Preferably, the power supply voltage pin VCC of the switching power supply U1 is further electrically connected with a capacitor C2 through a wire, a wire led out from the capacitor C2 is electrically connected with a resistor R3, and a wire led out from the resistor R3 is grounded.
Preferably, a lead between the capacitor C2 and the resistor R3 is electrically connected to the zener diode ZD2, and the other end of the zener diode ZD2 is electrically connected to a lead from the resistor R2.
Preferably, the triode Q1 is electrically connected with an adjustable resistor R5, one end of the adjustable resistor R5 is electrically connected to a lead led out from a power supply voltage pin VCC, the other end of the adjustable resistor R5 is electrically connected with a resistor R4, and the lead led out from the resistor R4 is grounded.
Preferably, the bypass voltage stabilizing circuit comprises a capacitor C3, a capacitor C4, a resistor R6, a resistor R7 and a filter a1, a power supply voltage pin VCC of the switching power supply U1 is further electrically connected with a resistor R6 and a capacitor C3 through a wire, an output end of the resistor R6 is electrically connected with a capacitor C4, a wire led out from the capacitor C4 is connected to the positive electrode of the filter a1, and the negative electrode of the filter a1 is grounded.
Preferably, a lead wire between the capacitor C4 and the filter A1 is electrically connected into R7, the capacitor C4 is electrically connected with R7 in parallel, and the capacitor C4, the resistor R6 and the filter A1 are electrically connected in series.
Preferably, a capacitor C5 is electrically connected between the bypass voltage stabilizing circuit and a rectifier bridge, the rectifier bridge comprises a diode D1, a diode D2, a diode D3, a diode D4 and a load resistor RL, the load resistor RL is electrically connected between the diode D1 and the diode D2, and the other end of the load resistor RL is electrically connected between the diode D3 and the diode D4.
Compared with the prior art, the utility model has the following beneficial effects:
the voltage stabilizing diode ZD1 provided by the utility model can adjust the fluctuation of the power supply voltage, keep the voltage at two ends of the load unchanged and ensure the stable output of the voltage of the switching power supply U1;
according to the boost circuit provided by the utility model, the triode Q1 is electrically connected with the capacitor C1 in parallel, so that the switch power supply U1 is matched with the triode Q1 to charge the capacitor C1, the boost circuit is connected to the power supply voltage pin VCC of the switch power supply U1, the capacitor C1 can be discharged again, the power supply voltage is increased, the boost size can be adjusted by matching the triode Q1 with the adjustable resistor R5, and the boost circuit can be used for stably releasing the voltage by matching with the diode ZD2, the capacitor C2 and the resistor R3;
the utility model is provided with a bypass voltage stabilizing circuit, and the filter A1 can effectively filter the frequency point of the specific frequency in the lead led out by the booster circuit or the frequencies except the frequency point to obtain a power signal of the specific frequency, thereby realizing the stable power supply of the switch power supply U1;
the utility model is provided with a rectifier bridge, realizes the unidirectional conduction of the diode through the cooperation of the diode D1, the diode D2, the diode D3 and the diode D4, and realizes the rectification through the cooperation of a load resistor RL.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1, the present embodiment provides a voltage stabilizing circuit for a switching power supply, which includes a switching power supply U1, a voltage boost circuit, and a bypass voltage stabilizing circuit, where a supply voltage pin VCC of the switching power supply U1 is electrically connected to a zener diode ZD1 through a wire, the other end of the diode ZD1 is electrically connected to a wire led out from a ground pin GND of the switching power supply U1, the zener diode ZD1 can adjust fluctuations of a power supply voltage, keep voltages at two ends of a load unchanged, and ensure stable output of a voltage of the switching power supply U1, the switching power supply U1 is electrically connected to the voltage boost circuit, the voltage boost circuit is electrically connected to the bypass voltage stabilizing circuit, a capacitor C5 is electrically connected between the bypass voltage stabilizing circuit and a rectifier bridge, the bypass voltage stabilizing circuit is electrically connected to the rectifier bridge, the rectifier bridge includes a diode D1, a diode D2, a diode D3, a diode D4, and a load resistor RL, a load resistor RL is electrically connected between the diode D1 and the diode D2, the other end of the load resistor RL is electrically connected between the diode D3 and the diode D4, unidirectional conduction of the diode is realized through cooperation of the diode D1, the diode D2, the diode D3 and the diode D4, and rectification is realized through cooperation of the load resistor RL.
Example two
The scheme in the first embodiment is further described in the following with reference to specific working modes, which are described in detail in the following:
as shown in fig. 1, as a preferred embodiment, based on the above-mentioned manner, further, the boost circuit includes a transistor Q1, a zener diode D2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, and an adjustable resistor R5, a lead of one end of the transistor Q1 is connected to a lead led out from a supply voltage pin VCC of a switching power supply U1, a lead led out from the other end of the transistor Q1 is electrically connected to the resistor R2, the resistor R2 is grounded through a lead, the transistor Q1 is electrically connected in parallel with the capacitor C1, so that the switching power supply U1 cooperates with the transistor Q1 to charge the capacitor C1, and the boost circuit is connected to the supply voltage pin VCC of the switching power supply U1 to re-discharge the capacitor C1 to increase the supply voltage, and the transistor Q1 cooperates with the adjustable resistor R5 to adjust the boost magnitude and cooperates with the diode ZD2, the capacitor C2 and the resistor R3 to stably release the voltage, switch power U1's supply voltage pin VCC still is connected with electric capacity C2 through the wire, the wire electricity that electric capacity C2 was drawn is connected with resistance R3, wire electricity between electric capacity C2 and the resistance R3 is connected into zener diode ZD2, the wire that resistance R2 was drawn is connected into to zener diode ZD 2's the other end electricity, the wire ground that resistance R3 was drawn, triode Q1 electricity is connected with adjustable resistance R5, the wire that supply voltage pin VCC was drawn is connected into to adjustable resistance R5's one end electricity, adjustable resistance R5's the other end electricity is connected with resistance R4, the wire ground that resistance R4 was drawn.
As shown in fig. 1, in addition to the above-described mode, as a preferred embodiment, further, the bypass voltage stabilizing circuit comprises a capacitor C3, a capacitor C4, a resistor R6, a resistor R7 and a filter A1, the power supply voltage pin VCC of the switching power supply U1 is also electrically connected with a resistor R6 and a capacitor C3 through wires, the output end of the resistor R6 is electrically connected with a capacitor C4, the lead wire led out by the capacitor C4 is connected with the anode of the filter A1, the wire between the capacitor C4 and the filter A1 is electrically connected into R7, the capacitor C4 is electrically connected in parallel with R7, the capacitor C4, the resistor R6 and the filter A1 are electrically connected in series, the filter A1 can effectively filter a frequency point of a specific frequency or frequencies except the frequency point in a lead led out by the booster circuit to obtain a power supply signal of the specific frequency, stable power supply of the switch power supply U1 is achieved, and the negative electrode of the filter A1 is grounded.
The working principle of the voltage stabilizing circuit for the switching power supply is as follows: firstly, a voltage stabilizing diode ZD1 can regulate fluctuation of power supply voltage, keep voltage at two ends of a load unchanged, and ensure stable output of voltage of a switch power supply U1, then, a booster circuit triode Q1 is electrically connected with a capacitor C1 in parallel, so that the switch power supply U1 is matched with a triode Q1 to charge a capacitor C1, the booster circuit is connected to a power supply voltage pin VCC of the switch power supply U1, the capacitor C1 can be discharged again to increase the power supply voltage, the booster size can be regulated by matching a triode Q1 with an adjustable resistor R5, and the booster size can be used for stably releasing the voltage by matching with a diode ZD2, the capacitor C2 and a resistor R3; then, the filter a1 can effectively filter a frequency point of a specific frequency or frequencies other than the frequency point in a lead led out by the voltage boost circuit to obtain a power signal of the specific frequency, so as to realize stable power supply of the switching power supply U1, realize unidirectional conduction of the diode through the cooperation of the diode D1, the diode D2, the diode D3 and the diode D4, and realize rectification by cooperating with the load resistor RL.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a voltage stabilizing circuit for switching power supply, includes switching power supply U1, boost circuit and bypass voltage stabilizing circuit, its characterized in that: the switching power supply U1 electricity is connected with the boost circuit, the boost circuit electricity is connected with bypass voltage stabilizing circuit, bypass voltage stabilizing circuit electricity is connected with the rectifier bridge.
2. The voltage regulator circuit for a switching power supply of claim 1, wherein: and a power supply voltage pin VCC of the switch power supply U1 is electrically connected with a voltage stabilizing diode ZD1 through a lead, and the other end of the diode ZD1 is electrically connected with a lead led out from a grounding pin GND of the switch power supply U1.
3. The voltage regulator circuit for a switching power supply of claim 1, wherein: the boosting circuit comprises a triode Q1, a voltage stabilizing diode D2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an adjustable resistor R5, wherein a lead at one end of the triode Q1 is connected with a lead led out from a power supply voltage pin VCC of a switching power supply U1, a lead led out from the other end of the triode Q1 is electrically connected with the resistor R2, and the resistor R2 is grounded through the lead.
4. A voltage regulator circuit for a switching power supply according to claim 3, wherein: the power supply voltage pin VCC of switching power supply U1 still is connected with electric capacity C2 through the wire, the wire that electric capacity C2 was drawn forth is connected with resistance R3, the wire ground that resistance R3 was drawn forth.
5. A voltage regulator circuit for a switching power supply according to claim 3, wherein: a lead between the capacitor C2 and the resistor R3 is electrically connected to a voltage stabilizing diode ZD2, and the other end of the voltage stabilizing diode ZD2 is electrically connected to a lead led out from the resistor R2.
6. A voltage regulator circuit for a switching power supply according to claim 3, wherein: the triode Q1 electricity is connected with adjustable resistance R5, the wire that power supply voltage pin VCC drawn is connected to the one end electricity of adjustable resistance R5, the other end electricity of adjustable resistance R5 is connected with resistance R4, the wire ground that resistance R4 was drawn.
7. The voltage regulator circuit for a switching power supply of claim 1, wherein: the bypass voltage stabilizing circuit comprises a capacitor C3, a capacitor C4, a resistor R6, a resistor R7 and a filter A1, a power supply voltage pin VCC of the switching power supply U1 is further electrically connected with a resistor R6 and a capacitor C3 through a lead, the output end of the resistor R6 is electrically connected with a capacitor C4, the lead led out by the capacitor C4 is connected to the anode of the filter A1, and the cathode of the filter A1 is grounded.
8. The voltage regulator circuit for a switching power supply of claim 7, wherein: the wire between the capacitor C4 and the filter A1 is electrically connected into R7, the capacitor C4 is electrically connected with R7 in parallel, and the capacitor C4, the resistor R6 and the filter A1 are electrically connected in series.
9. The voltage regulator circuit for a switching power supply of claim 1, wherein: a capacitor C5 is electrically connected between the bypass voltage stabilizing circuit and the rectifier bridge, the rectifier bridge comprises a diode D1, a diode D2, a diode D3, a diode D4 and a load resistor RL, the load resistor RL is electrically connected between the diode D1 and the diode D2, and the other end of the load resistor RL is electrically connected between the diode D3 and the diode D4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122107074.3U CN215897590U (en) | 2021-09-02 | 2021-09-02 | Voltage stabilizing circuit for switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122107074.3U CN215897590U (en) | 2021-09-02 | 2021-09-02 | Voltage stabilizing circuit for switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215897590U true CN215897590U (en) | 2022-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122107074.3U Active CN215897590U (en) | 2021-09-02 | 2021-09-02 | Voltage stabilizing circuit for switching power supply |
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| Country | Link |
|---|---|
| CN (1) | CN215897590U (en) |
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2021
- 2021-09-02 CN CN202122107074.3U patent/CN215897590U/en active Active
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