CN219779980U - Switching power supply voltage delay control circuit - Google Patents
Switching power supply voltage delay control circuit Download PDFInfo
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- CN219779980U CN219779980U CN202320896121.3U CN202320896121U CN219779980U CN 219779980 U CN219779980 U CN 219779980U CN 202320896121 U CN202320896121 U CN 202320896121U CN 219779980 U CN219779980 U CN 219779980U
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- triode
- operational amplifier
- switching power
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- 239000003990 capacitor Substances 0.000 claims abstract description 18
- 102000007315 Telomeric Repeat Binding Protein 1 Human genes 0.000 description 3
- 108010033711 Telomeric Repeat Binding Protein 1 Proteins 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 102000005591 NIMA-Interacting Peptidylprolyl Isomerase Human genes 0.000 description 2
- 108010059419 NIMA-Interacting Peptidylprolyl Isomerase Proteins 0.000 description 2
- 101150087393 PIN3 gene Proteins 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101100190527 Arabidopsis thaliana PIN5 gene Proteins 0.000 description 1
- 101100190528 Arabidopsis thaliana PIN6 gene Proteins 0.000 description 1
- 101100190529 Arabidopsis thaliana PIN7 gene Proteins 0.000 description 1
- 101100190530 Arabidopsis thaliana PIN8 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Abstract
The utility model discloses a switching power supply voltage delay control circuit which comprises a switching power supply output circuit, wherein the switching power supply output circuit comprises a transformer T2-B, a diode D1 and a capacitor C1, one end of the transformer T2-B is connected with the diode D1 in series and then connected with a Vo end, the other end of the transformer T2-B is grounded, and two ends of the transformer T2-B are connected with the capacitor C1 in series. The switching power supply voltage delay control circuit comprises a switching power supply constant voltage circuit consisting of resistors R1-R7, a three-terminal adjustable shunt regulator IC1, an operational amplifier U1A and an optocoupler PC1, and a delay voltage reduction control circuit consisting of a resistor R12, a triode Q1, a resistor R11, a triode Q2, a resistor R9, a capacitor C2 and an operational amplifier U1B, so that the purpose of reducing voltage is realized, and the problems of high cost, large PCB occupation area, software matching and the like are solved through simple circuit design.
Description
Technical Field
The utility model relates to the technical field of power switches, in particular to a switching power supply voltage delay control circuit.
Background
In the design and use process of the switching power supply, the voltage, the current or the power of the switching power supply can have a certain upper limit value due to the influence of factors such as volume, device limit or use mode, and the like, and when the starting current or the voltage is large, the electric appliance can be damaged, so that the starting voltage of the power supply needs to be delayed.
The voltage delay circuit of the current switching power supply uses an MCU, the MCU is high in price, the peripheral circuit is complex, and the following problems exist:
1. the cost is high, and the peripheral circuit is complex;
2. software is also required to coordinate.
Therefore, we propose a switching power supply voltage delay control circuit in order to solve the above-mentioned problems.
Disclosure of Invention
The utility model aims to provide a voltage delay control circuit of a switching power supply, which solves the problems that the voltage delay circuit of the prior switching power supply provided by the background technology is high in cost, the peripheral circuit is complex and software is needed for matching.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the switching power supply voltage delay control circuit comprises a switching power supply output circuit, wherein the switching power supply output circuit comprises a transformer T2-B, a diode D1 and a capacitor C1, one end of the transformer T2-B is connected with the diode D1 in series and then connected with the Vo end, the other end of the transformer T2-B is grounded, and two ends of the transformer T2-B are connected with the capacitor C1 in series.
Preferably, the switching power supply voltage delay control circuit further comprises a switching power supply constant voltage circuit, the switching power supply constant voltage circuit comprises an operational amplifier U1A, a three-terminal adjustable shunt regulator IC1 and an optocoupler PC1, the positive electrode of the power supply of the operational amplifier U1A is connected with the negative electrode of a diode D1, the negative electrode of the power supply of the operational amplifier U1A is connected with the K end of the optocoupler PC1, the negative input end of the operational amplifier U1A is connected between a resistor R5 and a resistor R6, the resistor R5 is connected with the negative electrode of a diode D1 after being connected with the resistor R4 in series, the evidence input end of the operational amplifier U1A is connected between a resistor R3 and a resistor R2, the resistor R2 is connected with the K end of the optocoupler PC1, the resistor R3 is connected with the negative electrode of the diode D1, the output end of the operational amplifier U1A is connected with the resistor R12 and then connected with the B end of the diode Q1, the three-terminal adjustable shunt regulator IC1 is connected with the resistor R5 in parallel.
Preferably, the switching power supply voltage delay control circuit further comprises a delay voltage reduction control circuit, the delay voltage reduction control circuit comprises an operational amplifier U1B, the positive input end of the operational amplifier U1B is connected with a capacitor C2 in series and then grounded, the positive input end of the operational amplifier U1B is connected with the C pole of a triode Q2 in series after being connected with a resistor R9, the B pole of the triode Q2 is connected with the C pole of the triode Q1 in series after being connected with a resistor R11, the E pole of the triode Q1 is grounded, the E pole of the triode Q2 is connected with the Vo end, the negative input end of the operational amplifier U1B is connected with the grounding end of the three-terminal adjustable shunt regulator IC1, the output end of the operational amplifier U1B is connected with the B pole of the triode Q3 in series after being connected with a resistor R8, and the C pole and the B pole of the triode Q3 are respectively connected with the two ends of the resistor R7.
Preferably, the transistors Q1 and Q3 are NPN transistors, and the transistor Q2 is a PNP transistor.
Compared with the prior art, the utility model has the beneficial effects that: the switching power supply voltage delay control circuit comprises a switching power supply constant voltage circuit consisting of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a three-terminal adjustable shunt regulator IC1, an operational amplifier U1A and an optocoupler PC1, is convenient for outputting stable voltage, and is a delay voltage reduction control circuit consisting of a resistor R12, a triode Q1, a resistor R11, a triode Q2, a resistor R9, a capacitor C2, an operational amplifier U1B, a triode Q3 and a resistor R7, so that the purpose of reducing the voltage after the output voltage is delayed is realized, the problems of high price, large PCB occupation area, software matching and the like can be solved through simple circuit design, and the reliability of products is improved.
Drawings
Fig. 1 is a schematic diagram of a switching power supply voltage delay control circuit according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, the present utility model provides a technical solution: the switching power supply voltage delay control circuit comprises a switching power supply output circuit, wherein the switching power supply output circuit comprises a transformer T2-B, a diode D1 and a capacitor C1, one end of the transformer T2-B is connected with the diode D1 in series and then connected with the Vo end, the other end of the transformer T2-B is grounded, and two ends of the transformer T2-B are connected with the capacitor C1 in series, so that power supply is facilitated.
The switching power supply voltage delay control circuit further comprises a switching power supply constant voltage circuit, the switching power supply constant voltage circuit comprises an operational amplifier U1A, a three-terminal adjustable shunt regulator IC1 and an optocoupler PC1, the power supply anode of the operational amplifier U1A is connected with the cathode of a diode D1, the power supply cathode of the operational amplifier U1A is connected with the K end of the optocoupler PC1, the negative input end of the operational amplifier U1A is connected between a resistor R5 and a resistor R6, the resistor R5 is connected with the cathode of a diode D1 after being connected with a resistor R4 in series, the resistor R6 is connected with the K end of the optocoupler PC1 after being connected with a resistor R7 in series, the evidence input end of the operational amplifier U1A is connected between a resistor R3 and a resistor R2, the resistor R2 is connected with the K end of the optocoupler PC1, the resistor R3 is connected with the cathode of the diode D1, the output end of the operational amplifier U1A is connected with the resistor R1 after being grounded, the output end of the operational amplifier U1A is connected with the B end of the diode Q1 after being connected with the resistor R12 in series, the three-terminal adjustable shunt regulator IC is connected with the three-terminal voltage regulator IC1, and the voltage regulator IC1 can be conveniently regulated.
The delay voltage reduction control circuit comprises an operational amplifier U1B, wherein the positive input end of the operational amplifier U1B is connected with a capacitor C2 in series and then grounded, the positive input end of the operational amplifier U1B is connected with the C pole of a triode Q2 in series after being connected with a resistor R9, the B pole of the triode Q2 is connected with the C pole of the triode Q1 in series after being connected with a resistor R11, the E pole of the triode Q1 is grounded, the E pole of the triode Q2 is connected with the Vo end, the negative input end of the operational amplifier U1B is connected with the grounding end of the three-terminal adjustable shunt regulator IC1, the output end of the operational amplifier U1B is connected with the B pole of the triode Q3 in series after being connected with a resistor R8, and the C pole and the B pole of the triode Q3 are respectively connected with the two ends of a resistor R7, so that the purpose of reducing the voltage after the output voltage is delayed is realized.
The triode Q1 and the triode Q3 are NPN triodes, and the triode Q2 is a PNP triode, so that the flow direction of current can be conveniently controlled.
Working principle: when the switching power supply voltage delay control circuit is used, a reasonable input voltage is achieved when the switching power supply is connected and has the effect of passing through a transformer T2-B, the input voltage flows to a resistor R4 through the effect of a diode D1, the resistor R4 and the three-terminal adjustable shunt regulator IC1 generate a comparison voltage of about 2.5V, the voltage of 2.5V is divided by a resistor R5, a resistor R6 and a resistor R7, the divided voltage of the resistor R6+ the resistor R7 = 2.5 (R6 + R7)/(R5 + R6+ R7) is input to the PIN2 end of the operational amplifier U1A, the resistor R3 and the resistor R2 divide the output voltage Vo into Vo (R2/(R2 + R3)) to the PIN3 of the operational amplifier U1A, and once the PIN3 voltage of the operational amplifier U1A is higher than the PIN2 voltage, the PIN1 of the operational amplifier U1A outputs a high level, and the optocoupler PC1 of the switching power supply is pushed to stably conduct the output voltage at a set value Vo.
When the output reaches the voltage stabilizing point Vo (for example, 15V), the PIN1 of the operational amplifier U1A outputs a high level, the triode Q1 is turned on and the triode Q2 is turned on sequentially through the R12, vo charges the capacitor C2 through the EC pole of the triode Q2 and the resistor R9, when the capacitor C2 is charged to be greater than 2.5V, the PIN5 voltage of the operational amplifier U1B, that is, the voltage on the capacitor C2, at this time, the PIN6 voltage of the operational amplifier U1B is 2.5V, the PIN7 of the operational amplifier U1B outputs a high level, the triode Q3 is turned on to pull the resistor R7 down to be short-circuited to ground, the voltage of the operational amplifier U1A PIN2 is reduced to 2.5×r6/(r5+r7)/(r5+r6+r7), and the output voltage Vo is correspondingly lowered, which achieves the purpose of reducing the output voltage after the delay, that is that the delay control of the voltage of the switching power supply is not described in the prior art.
Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.
Claims (4)
1. A switching power supply voltage delay control circuit is characterized in that: the power supply comprises a switching power supply output circuit, wherein the switching power supply output circuit comprises a transformer T2-B, a diode D1 and a capacitor C1, one end of the transformer T2-B is connected with the diode D1 in series and then is connected with a Vo end, the other end of the transformer T2-B is grounded, and two ends of the transformer T2-B are connected with the capacitor C1 in series.
2. The switching power supply voltage delay control circuit of claim 1 wherein: the constant-voltage circuit of the switching power supply comprises an operational amplifier U1A, a three-terminal adjustable shunt regulator IC1 and an optocoupler PC1, wherein the positive electrode of the power supply of the operational amplifier U1A is connected with the negative electrode of a diode D1, the negative electrode of the power supply of the operational amplifier U1A is connected with the K end of the optocoupler PC1, the negative input end of the operational amplifier U1A is connected between a resistor R5 and a resistor R6, the resistor R5 is connected with the negative electrode of a diode D1 in series, the resistor R6 is connected with the K end of the optocoupler PC1 in series after being connected with a resistor R4, the evidence input end of the operational amplifier U1A is connected between a resistor R3 and a resistor R2, the resistor R2 is connected with the K end of the optocoupler PC1 in series, the resistor R3 is connected with the negative electrode of the diode D1, the output end of the operational amplifier U1A is connected with the B end of the resistor Q1 after being connected with the resistor R12, the three-terminal adjustable shunt regulator IC1 is connected with the resistor R5 in series, and the three-terminal adjustable shunt regulator IC1 is connected with the resistor R5 in series.
3. A switching power supply voltage delay control circuit as defined in claim 2, wherein: the three-phase voltage-reducing circuit comprises a capacitor C2, an operational amplifier U1B, a capacitor C2, a resistor R9, a triode Q2, a triode Q1, a triode Q2 and a triode Q7, and is characterized by further comprising a delay voltage-reducing control circuit, wherein the delay voltage-reducing control circuit comprises the operational amplifier U1B, the positive input end of the operational amplifier U1B is connected with the capacitor C2 in series and then grounded, the positive input end of the operational amplifier U1B is connected with the C pole of the triode Q2 in series, the B pole of the triode Q2 is connected with the C pole of the triode Q1 in series and then grounded, the E pole of the triode Q2 is connected with the Vo end, the negative input end of the operational amplifier U1B is connected with the grounding end of the three-terminal adjustable shunt regulator IC1, the output end of the operational amplifier U1B is connected with the B pole of the triode Q3 in series and the C pole and the B pole of the triode Q3 are respectively connected with the two ends of the resistor R7.
4. A switching power supply voltage delay control circuit as defined in claim 3, wherein: the triode Q1 and the triode Q3 are NPN triodes, and the triode Q2 is a PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320896121.3U CN219779980U (en) | 2023-04-19 | 2023-04-19 | Switching power supply voltage delay control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320896121.3U CN219779980U (en) | 2023-04-19 | 2023-04-19 | Switching power supply voltage delay control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219779980U true CN219779980U (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320896121.3U Active CN219779980U (en) | 2023-04-19 | 2023-04-19 | Switching power supply voltage delay control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219779980U (en) |
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2023
- 2023-04-19 CN CN202320896121.3U patent/CN219779980U/en active Active
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