CN219436872U - Step-down power supply circuit of series voltage-stabilizing diode - Google Patents
Step-down power supply circuit of series voltage-stabilizing diode Download PDFInfo
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- CN219436872U CN219436872U CN202320445162.0U CN202320445162U CN219436872U CN 219436872 U CN219436872 U CN 219436872U CN 202320445162 U CN202320445162 U CN 202320445162U CN 219436872 U CN219436872 U CN 219436872U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a series voltage-stabilizing diode step-down power supply circuit, which relates to the technical field of switching power supplies and comprises an output voltage processing circuit, a pulse control circuit, a feedback circuit, a sampling circuit and a voltage output end; the output voltage processing circuit is connected to the mains supply of the power grid, and outputs direct current at the voltage output end after the mains supply of the power grid is processed; the feedback circuit is connected between the pulse control circuit and the sampling circuit, the pulse control circuit is electrically connected with the output voltage processing circuit, and the sampling circuit is connected to the voltage output end; the feedback circuit comprises an optocoupler U2, a zener diode ZD1, a controllable precise voltage-stabilizing chip U3 and a capacitor C4; the beneficial effects of the utility model are as follows: the power supply is realized through a simpler circuit structure, the design requirements of low cost and small volume are met, the use of materials is reduced, and the cost is reduced.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a voltage-reducing power supply circuit of a series voltage-stabilizing diode.
Background
Switching power supply products such as power adapters and chargers have been widely used in real life. The output voltage of many power supply products is greater than 24VDC, and the current stage is realized by adding a winding and a plurality of peripheral elements in the transformer, so that the materials of the products are increased, and the cost is increased.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides the voltage-reducing power supply circuit of the series voltage-stabilizing diode, which realizes power supply through a simpler circuit structure and reduces the material cost.
The technical scheme adopted for solving the technical problems is as follows: the voltage-reducing power supply circuit of the series voltage-stabilizing diode is characterized by comprising an output voltage processing circuit, a pulse control circuit, a feedback circuit, a sampling circuit and a voltage output end;
the output voltage processing circuit is connected to the mains supply of the power grid, and outputs direct current at the voltage output end after the mains supply of the power grid is processed; the feedback circuit is connected between the pulse control circuit and the sampling circuit, the pulse control circuit is electrically connected with the output voltage processing circuit, and the sampling circuit is connected to the voltage output end;
the feedback circuit comprises an optocoupler U2, a zener diode ZD1, a controllable precise voltage-stabilizing chip U3 and a capacitor C4; the positive electrode of the zener diode ZD1 is connected to the first input pin of the optocoupler U2, and the positive electrode of the zener diode ZD1 is connected to the voltage output end; the controllable precise voltage stabilizing chip U3 is arranged between the second input pin of the optical coupler U2 and the grounding end, and the reference electrode of the controllable precise voltage stabilizing chip U3 is connected to the sampling circuit; the capacitor C4 is arranged between the second input pin of the optical coupler U2 and the sampling circuit, and the output end of the optical coupler U2 is connected to the pulse control circuit.
In the above structure, the feedback circuit further includes a resistor R8 and a resistor R9, where the resistor R8 is disposed between the first input pin of the optocoupler U2 and the zener diode ZD1, and the resistor R9 is disposed between the second input pin of the optocoupler U2 and the capacitor C4.
In the above structure, the sampling circuit includes a resistor R10 and a resistor R11, where after the resistor R10 is connected in series with the resistor R11, one end of the resistor R is connected to the voltage output end, and the other end is grounded;
the capacitor C4 and the reference electrode of the controllable precise voltage stabilizing chip U3 are both connected to the common end between the resistor R10 and the resistor R11.
In the above structure, the controllable precision voltage stabilizing chip U3 is model TL431.
In the above structure, the pulse control circuit comprises a pulse chip U1, and the model of the pulse chip U1 is LD7575; the first output pin of the output end of the optical coupler U2 is connected to the FB pin of the chip U1, and the second output pin of the output end of the optical coupler U2 is connected to the grounding end.
In the above structure, the pulse control circuit further includes a MOS transistor Q1, and a GATE of the MOS transistor Q1 is connected to a GATE pin of the pulse chip U1.
In the above structure, the output voltage processing circuit includes an EMC filter circuit, a first rectifying filter circuit, an absorption circuit, a transformer T1, and a second rectifying filter circuit electrically connected in sequence;
the mains supply of the power grid is connected to the input end of the EMC filter circuit, and the output end of the second rectifying filter circuit is the voltage output end;
the drain electrode of the MOS tube Q1 is connected to the N1 winding of the transformer T1.
In the above structure, the absorption circuit includes a resistor R1, a capacitor C1, and a diode D1, where the resistor R1 is connected in parallel with the capacitor C1, one end of the resistor is connected to the output end of the first rectifying and filtering circuit, the other end of the resistor is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the drain of the MOS transistor Q1.
The beneficial effects of the utility model are as follows: the power supply is realized through a simpler circuit structure, the design requirements of low cost and small volume are met, the use of materials is reduced, and the cost is reduced.
Drawings
Fig. 1 is a schematic circuit diagram of a series zener diode buck power supply circuit of the present utility model.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model. In addition, all the coupling/connection relationships referred to in the patent are not direct connection of the single-finger members, but rather, it means that a better coupling structure can be formed by adding or subtracting coupling aids depending on the specific implementation. The technical features in the utility model can be interactively combined on the premise of no contradiction and conflict.
Referring to fig. 1, the utility model discloses a series voltage-stabilizing diode step-down power supply circuit, which comprises an input voltage processing circuit 10, a pulse control circuit 20, a feedback circuit 30, a sampling circuit 40 and a voltage output end 50; the input voltage processing circuit 10 is connected to the mains supply of the power grid, processes the mains supply of the power grid, and outputs direct current at the voltage output end 50; in this embodiment, the 220V ac power is processed into 48V dc power by the input voltage processing circuit 10 for output, and the specific structure of the input voltage processing circuit 10 will be further described below. The feedback circuit 30 is connected between the pulse control circuit 20 and the sampling circuit 40, the pulse control circuit 20 is electrically connected to the input voltage processing circuit 10, and the sampling circuit 40 is connected to the voltage output terminal 50.
In this embodiment, the feedback circuit 30 includes an optocoupler U2, a zener diode ZD1, a controllable precision voltage-stabilizing chip U3, and a capacitor C4; the model of the optocoupler U2 is PC817B, and the controllable precise voltage stabilizing chip U3 is TL431. The positive electrode of the zener diode ZD1 is connected to the first input pin of the optocoupler U2, and the positive electrode of the zener diode ZD1 is connected to the voltage output end 50; the controllable precise voltage stabilizing chip U3 is arranged between the second input pin of the optical coupler U2 and the grounding end, and the reference electrode of the controllable precise voltage stabilizing chip U3 is connected to the sampling circuit 40; the capacitor C4 is disposed between the second input pin of the optocoupler U2 and the sampling circuit 40, and the output end of the optocoupler U2 is connected to the pulse control circuit 20. More specifically, the feedback circuit 30 further includes a resistor R8 and a resistor R9, the resistor R8 is disposed between the first input pin of the optocoupler U2 and the zener diode ZD1, and the resistor R9 is disposed between the second input pin of the optocoupler U2 and the capacitor C4. In addition, the sampling circuit 40 includes a resistor R10 and a resistor R11, wherein after the resistor R10 is connected in series with the resistor R11, one end of the resistor R is connected to the voltage output terminal 50, and the other end is grounded; the capacitor C4 and the reference electrode of the controllable precise voltage stabilizing chip U3 are both connected to the common end between the resistor R10 and the resistor R11.
With continued reference to fig. 1, the pulse control circuit 20 includes a pulse chip U1 and a MOS transistor Q1, where the model of the pulse chip U1 is LD7575; the first output pin of the output end of the optical coupler U2 is connected to the FB pin of the chip U1, and the second output pin of the output end of the optical coupler U2 is connected to the grounding end; the GATE of the MOS transistor Q1 is connected to the GATE pin of the pulse chip U1.
In the above embodiment, the output voltage processing circuit 10 includes the EMC filter circuit 101, the first rectifying filter circuit 102, the absorption circuit 103, the transformer T1, and the second rectifying filter circuit 104 electrically connected in sequence; the mains supply of the power grid is connected to the input end of the EMC filter circuit 101, and the output end of the second rectifying filter circuit 104 is the voltage output end 50; the drain electrode of the MOS transistor Q1 is connected to one end of the primary side of the transformer T1 and the absorption circuit 103. In this embodiment, the absorption circuit 103 includes a resistor R1, a capacitor C1, and a diode D1, where the resistor R1 is connected in parallel with the capacitor C1, one end of the resistor is connected to the output end of the first rectifying and filtering circuit 102, the other end of the resistor is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the drain of the MOS transistor Q1, so that a voltage spike generated by the leakage inductance of the primary winding is eliminated through the absorption circuit 103.
In the above circuit structure, as shown in fig. 1, mains supply enters through the power supply terminal 105 (L, N port), passes through the EMC filter circuit 101 composed of the fuse F1 and the lightning protection device MOV1, and the anti-surge impact NTC1, LF1 and CX1, and reaches BD1 to rectify, and is filtered by EC1 to become direct current, and is sent to the input terminal of the transformer T1. The high-voltage direct current on EC1 provides starting voltage for pulse chip U1 through R2, pulse chip U1 works when being opened, an oscillator is formed by the internal circuit of pulse chip U1 and R3, continuous pulse waves are generated, MOS tube Q1 is controlled to be conducted and cut off through R4, at the moment, pulse current flows through N1 winding of transformer T1, and the pulse currents are grounded through MOS tube Q1 and resistor R7. An alternating magnetic field generated by the N1 winding induces the N2 winding, induced voltage generated by the N2 winding is rectified by D3, and EC3 is filtered to be smooth direct current and output to a load. After the MOS tube Q1 works in the on state, the induction voltage generated by N3 of the T1 is rectified by D2, and EC2 is filtered to provide working voltage for U1. The resistor R6 and the capacitor C3 are power supply overcurrent protection circuits. When the output voltage fluctuation is unstable, the resistor R10 and the resistor R11 form a sampling circuit 40 of the output voltage, the feedback circuit 30 is controlled, and the width or frequency of the output pulse of the pulse chip U1 is regulated, so that the stability of the output voltage is achieved. Therefore, the voltage-reducing power supply circuit of the series voltage-stabilizing diode realizes power supply through a simpler circuit structure, meets the design requirements of low cost and small volume, reduces the use of materials and reduces the cost.
While the preferred embodiment of the present utility model has been described in detail, the present utility model is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalent modifications or substitutions are included in the scope of the present utility model as defined in the appended claims.
Claims (8)
1. The voltage-reducing power supply circuit of the series voltage-stabilizing diode is characterized by comprising an output voltage processing circuit, a pulse control circuit, a feedback circuit, a sampling circuit and a voltage output end;
the output voltage processing circuit is connected to the mains supply of the power grid, and outputs direct current at the voltage output end after the mains supply of the power grid is processed; the feedback circuit is connected between the pulse control circuit and the sampling circuit, the pulse control circuit is electrically connected with the output voltage processing circuit, and the sampling circuit is connected to the voltage output end;
the feedback circuit comprises an optocoupler U2, a zener diode ZD1, a controllable precise voltage-stabilizing chip U3 and a capacitor C4; the positive electrode of the zener diode ZD1 is connected to the first input pin of the optocoupler U2, and the positive electrode of the zener diode ZD1 is connected to the voltage output end; the controllable precise voltage stabilizing chip U3 is arranged between the second input pin of the optical coupler U2 and the grounding end, and the reference electrode of the controllable precise voltage stabilizing chip U3 is connected to the sampling circuit; the capacitor C4 is arranged between the second input pin of the optical coupler U2 and the sampling circuit, and the output end of the optical coupler U2 is connected to the pulse control circuit.
2. The buck power supply circuit according to claim 1, wherein the feedback circuit further includes a resistor R8 and a resistor R9, the resistor R8 being disposed between the first input pin of the optocoupler U2 and the zener diode ZD1, and the resistor R9 being disposed between the second input pin of the optocoupler U2 and the capacitor C4.
3. The voltage-reducing power supply circuit of the series zener diode according to claim 1, wherein the sampling circuit comprises a resistor R10 and a resistor R11, wherein after the resistor R10 is connected in series with the resistor R11, one end of the resistor R10 is connected to the voltage output end, and the other end is grounded;
the capacitor C4 and the reference electrode of the controllable precise voltage stabilizing chip U3 are both connected to the common end between the resistor R10 and the resistor R11.
4. The buck supply circuit of claim 1, wherein the controllable precision voltage regulator die U3 is model TL431.
5. The serial voltage-stabilizing diode voltage-reducing power supply circuit according to claim 1, wherein the pulse control circuit comprises a pulse chip U1, and the model of the pulse chip U1 is LD7575; the first output pin of the output end of the optical coupler U2 is connected to the FB pin of the chip U1, and the second output pin of the output end of the optical coupler U2 is connected to the grounding end.
6. The buck power supply circuit of claim 5, wherein the pulse control circuit further includes a MOS transistor Q1, and a GATE of the MOS transistor Q1 is connected to a GATE pin of the pulse chip U1.
7. The buck power supply circuit of claim 6, wherein the output voltage processing circuit includes an EMC filter circuit, a first rectifying filter circuit, an absorption circuit, a transformer T1, and a second rectifying filter circuit electrically connected in sequence;
the mains supply of the power grid is connected to the input end of the EMC filter circuit, and the output end of the second rectifying filter circuit is the voltage output end;
the drain electrode of the MOS tube Q1 is connected to one end of the primary side of the transformer T1 and the absorption circuit.
8. The buck power supply circuit according to claim 7, wherein the snubber circuit includes a resistor R1, a capacitor C1, and a diode D1, the resistor R1 is connected in parallel with the capacitor C1, one end of the resistor R1 is connected to the output terminal of the first rectifying and filtering circuit, the other end of the resistor R1 is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the drain of the MOS transistor Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320445162.0U CN219436872U (en) | 2023-02-27 | 2023-02-27 | Step-down power supply circuit of series voltage-stabilizing diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320445162.0U CN219436872U (en) | 2023-02-27 | 2023-02-27 | Step-down power supply circuit of series voltage-stabilizing diode |
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| Publication Number | Publication Date |
|---|---|
| CN219436872U true CN219436872U (en) | 2023-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320445162.0U Active CN219436872U (en) | 2023-02-27 | 2023-02-27 | Step-down power supply circuit of series voltage-stabilizing diode |
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| Country | Link |
|---|---|
| CN (1) | CN219436872U (en) |
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2023
- 2023-02-27 CN CN202320445162.0U patent/CN219436872U/en active Active
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