CN215120119U - Switching power supply and power supply device for preventing surge current - Google Patents
Switching power supply and power supply device for preventing surge current Download PDFInfo
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- CN215120119U CN215120119U CN202023351133.3U CN202023351133U CN215120119U CN 215120119 U CN215120119 U CN 215120119U CN 202023351133 U CN202023351133 U CN 202023351133U CN 215120119 U CN215120119 U CN 215120119U
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Abstract
The utility model relates to a switching power supply and prevent surge current's power supply unit, including input connection end, soft start unit and output connection end, the soft start unit includes first subtraction amplifier, second subtraction amplifier, the adjustable voltage component of second and the adjustable voltage component of third. The voltage input by the input connecting end is output through the first subtraction amplifier, the output voltage is respectively compared with the upper limit amplitude voltage of the second adjustable voltage element and the lower limit amplitude voltage of the third adjustable voltage element in the second subtraction amplifier, the voltage output by the output connecting end is between 40V and 500V, the voltage output by the output connecting end is prevented from generating extremely large surge current, the power supply load equipment is damaged, the surge phenomenon is effectively avoided, meanwhile, the stability of an electronic circuit of the switching power supply is enhanced, the service life of the switching power supply is prolonged, and the working efficiency of the power supply is improved.
Description
Technical Field
The utility model relates to a switching power supply technical field specifically, relates to a switching power supply and prevent surge current's power supply unit.
Background
The power supply system of a high-power switching power supply generally filters input voltage by interference, then rectifies the input voltage by a thyristor, and then smoothes waveforms by using a large electrolytic capacitor, and then enters a real converter for converting direct current into direct current. The power supply system of the switch power supply has an inherent problem that a large current is drawn at the moment of power-on, because a capacitor is in a short-circuit state at the moment of power-on, a large surge current can be generated in an input circuit of the power supply system, so that a load device for supplying power can be greatly impacted, and even the load device can not work due to tripping of a breaker in severe cases.
Therefore, it is desirable to provide a switching power supply and a power supply device for preventing inrush current, so as to solve the deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a switching power supply and power supply device for preventing surge current.
The technical scheme of the utility model as follows:
a surge current prevention power supply device is applied to a switching power supply and comprises an input connecting end, a soft start unit and an output connecting end, wherein the soft start unit is connected with the input connecting end and comprises a first subtraction amplifier connected with the input connecting end, a second subtraction amplifier connected with the first subtraction amplifier, and a second adjustable voltage element and a third adjustable voltage element which are connected with the output end of the second subtraction amplifier; and the output connecting end is connected with the power supply anode of the third adjustable voltage element.
Preferably, the soft start unit further includes a sixth resistor, a first semiconductor device, a second semiconductor device, and a seventh resistor connected to the negative input terminal of the second subtraction amplifier, the sixth resistor is further grounded, the seventh resistor and the negative terminal of the first semiconductor device are further connected to the output terminal of the second subtraction amplifier, respectively, and the positive electrode of the second semiconductor device is further connected to the output terminal of the second adjustable voltage element.
Preferably, the positive pole of the second adjustable voltage element is connected with the output end of the second subtraction amplifier, and the negative pole of the second adjustable voltage element is connected with the sixteenth resistor in series and grounded.
Preferably, a twelfth resistor and a third semiconductor device are further connected in series between the output end of the second subtraction amplifier and the positive connection of the third adjustable voltage element.
Preferably, the positive electrode of the third adjustable voltage element is further connected to the output end of the third adjustable voltage element and a ninth resistor, respectively, and the ninth resistor is connected to the first power supply.
Preferably, the voltage of the first power supply is 15V.
Preferably, the second adjustable voltage element and the third adjustable voltage element are both potentiometers or adjustable resistors.
Preferably, the first and second subtraction amplifiers are both LV29020 type amplifiers.
The utility model also provides a switching power supply, including the mains connection end, with the above-mentioned that the mains connection end is connected prevent surge current's power supply unit and with the power supply output that prevents surge current's power supply unit connects.
The utility model has the advantages that: compared with the prior art, the switching power supply and the power supply device for preventing surge current comprise an input connecting end, a soft start unit and an output connecting end, wherein the soft start unit comprises a first subtraction amplifier, a second adjustable voltage element and a third adjustable voltage element. The voltage input by the input connecting end is output through the first subtraction amplifier, the output voltage is respectively compared with the upper limit amplitude voltage of the second adjustable voltage element and the lower limit amplitude voltage of the third adjustable voltage element in the second subtraction amplifier, the voltage output by the output connecting end is between 40V and 500V, the voltage output by the output connecting end is prevented from generating extremely large surge current, the power supply load equipment is damaged, the surge phenomenon is effectively avoided, meanwhile, the stability of an electronic circuit of the switching power supply is enhanced, the service life of the switching power supply is prolonged, and the working efficiency of the power supply is improved.
Description of the drawings:
fig. 1 is a circuit frame diagram of the power supply device for preventing surge current according to the present invention.
Fig. 2 is a schematic circuit diagram of the power supply device for preventing surge current according to the present invention.
Fig. 3 is a frame diagram of the switching power supply of the present invention.
Detailed Description
In order to make the object, technical solution and technical effect of the present invention more clearly understood, the present invention will be further described with reference to the following embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 3, the switching power supply of the present invention includes a mains connection end 10, a power supply device 20 connected to the mains connection end 10 for preventing surge current, and a power supply output end 30 connected to the power supply device 20 for preventing surge current.
It should be noted that, alternating current of the commercial power connection end 10 and 380V is rectified and filtered by the transformer and the rectifier bridge, and then 40-1000V dc voltage is output and transmitted to the power supply device 20 for preventing surge current, the power supply device 20 for preventing surge current is used for adjusting the rectified and filtered output 40-1000V dc voltage, and preventing short circuit of an electronic device (such as PLC control) connected with the power supply output end 30 due to too large output pulse width at the moment of power supply, thereby effectively avoiding the generation of surge phenomenon, enhancing the stability of a switching power supply electronic circuit, and improving the service life of the switching power supply and the working efficiency of the power supply.
Referring to fig. 1 and fig. 2, the surge current prevention power supply device 20 of the present invention is applied to a switching power supply, and includes an input connection terminal 21, a soft start unit 22 connected to the input connection terminal 21, and an output connection terminal 23, where the soft start unit 20 includes a first subtraction amplifier U2 connected to the input connection terminal 21, a second subtraction amplifier U3 connected to the first subtraction amplifier U2, and a second adjustable voltage element RP2 and a third adjustable voltage element RP3 connected to the output terminal of the second subtraction amplifier U3; the output connection 23 is connected to the positive supply terminal of the third adjustable voltage element RP 3.
It should be noted that the first and second differential amplifiers U2 and U3 are preferably LV29020 type amplifiers. The second adjustable voltage element RP2 and the third adjustable voltage element RP3 may be both potentiometers and also adjustable resistors. In this embodiment, the second adjustable voltage element RP2 and the third adjustable voltage element RP3 are both potentiometers.
The utility model discloses an in the embodiment, input connection end 21 is connected through the 40 ~ 1000V DC voltage of rectification filtering output with 380V's alternating current, and output connection end 23 is connected with power supply output end 30.
In the embodiment of the present invention, the power supply device for preventing surge current compares the voltage output by the first subtraction amplifier U2 with the upper limit amplitude voltage of the second adjustable voltage element RP2 and the lower limit amplitude voltage of the third adjustable voltage element RP3 through the second subtraction amplifier U3, and if the voltage output by the first subtraction amplifier U2 is smaller than the lower limit amplitude voltage of the third adjustable voltage element RP3, the voltage output by the output connection terminal 23 is the lower limit amplitude voltage of the third adjustable voltage element RP 3; if the voltage output by the first differential amplifier U2 is greater than the upper-limit amplitude voltage of the second adjustable voltage element RP2, the voltage output by the output connection terminal 23 is the upper-limit amplitude voltage of the second adjustable voltage element RP 2. If the voltage output by the first differential amplifier U2 is between the upper limit amplitude voltage of the second adjustable voltage element RP2 and the lower limit amplitude voltage of the third adjustable voltage element RP3, the voltage output by the output connection 23 is the voltage output by the output connection 23.
It should be noted that the upper limit amplitude voltage of the second adjustable voltage element RP2 is preferably 40V, and the lower limit amplitude voltage of the third adjustable voltage element RP3 is preferably 500V.
The utility model provides a pair of prevent inrush current's power supply unit includes input connection end, soft start unit and output connection end, and the soft start unit includes first subtraction amplifier, second subtraction amplifier, the adjustable voltage component of second and the adjustable voltage component of third. The voltage input by the input connecting end is output through the first subtraction amplifier, the output voltage is respectively compared with the upper limit amplitude voltage of the second adjustable voltage element and the lower limit amplitude voltage of the third adjustable voltage element in the second subtraction amplifier, the voltage output by the output connecting end is between 40V and 500V, the voltage output by the output connecting end is prevented from generating extremely large surge current, the power supply load equipment is damaged, the surge phenomenon is effectively avoided, meanwhile, the stability of an electronic circuit of the switching power supply is enhanced, the service life of the switching power supply is prolonged, and the working efficiency of the power supply is improved.
As shown in fig. 2, in the embodiment of the present invention, the soft-start unit 22 further includes a sixth resistor R6 connected to the negative input terminal of the second subtraction amplifier U3, a first semiconductor device D1, a second semiconductor device D2, and a seventh resistor R7, the sixth resistor R6 is further grounded, the negative terminals of the seventh resistor R7 and the first semiconductor device D1 are further connected to the output terminal of the second subtraction amplifier U3, and the positive terminal of the second semiconductor device D1 is further connected to the output terminal of the second adjustable voltage element RP 2.
It should be noted that the first semiconductor device D1 and the second semiconductor device D2 are preferably diodes.
As shown in fig. 2, in the embodiment of the present invention, the anode of the second adjustable voltage element RP2 is connected to the output terminal of the second subtraction amplifier U3, and the cathode of the second adjustable voltage element RP2 is connected in series with the sixteenth resistor R16 and grounded.
As shown in fig. 2, in the embodiment of the present invention, a twelfth resistor R12 and a third semiconductor device D3 are connected in series between the output terminal of the second differential amplifier U3 and the positive connection of the third adjustable voltage element RP 3.
It should be noted that the third semiconductor device D3 is preferably a diode.
As shown in fig. 2, in the embodiment of the present invention, the positive electrode of the third adjustable voltage element RP3 is further connected to the output terminal of the third adjustable voltage element RP3 and the ninth resistor R9, respectively, and the ninth resistor R9 is connected to the first power supply.
The voltage of the first power supply is preferably 15V.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of the ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, its framework form can be nimble changeable, can derive series of products. But merely as a matter of simple deductions or substitutions, should be considered as belonging to the scope of patent protection of the present invention as determined by the claims submitted.
Claims (9)
1. The power supply device is characterized by comprising an input connecting end, a soft start unit and an output connecting end, wherein the soft start unit is connected with the input connecting end and comprises a first subtraction amplifier connected with the input connecting end, a second subtraction amplifier connected with the first subtraction amplifier, and a second adjustable voltage element and a third adjustable voltage element which are connected with the output end of the second subtraction amplifier; and the output connecting end is connected with the power supply anode of the third adjustable voltage element.
2. The inrush current protection power supply device according to claim 1, wherein the soft start unit further comprises a sixth resistor, a first semiconductor device, a second semiconductor device, and a seventh resistor connected to the negative input terminal of the second subtraction amplifier, the sixth resistor is further connected to ground, the seventh resistor and the negative terminal of the first semiconductor device are further connected to the output terminal of the second subtraction amplifier, respectively, and the positive terminal of the second semiconductor device is further connected to the output terminal of the second adjustable voltage element.
3. The inrush current protection power supply of claim 1, wherein the positive terminal of the second adjustable voltage component is connected to the output terminal of the second differential amplifier, and the negative terminal of the second adjustable voltage component is connected in series with a sixteenth resistor to ground.
4. The inrush current protection power supply of claim 1, wherein a twelfth resistor and a third semiconductor device are further connected in series between the output terminal of the second subtraction amplifier and the positive connection of the third adjustable voltage element.
5. The inrush current protection power supply device according to claim 1, wherein the positive electrode of the third adjustable voltage element is further connected to the output terminal of the third adjustable voltage element and a ninth resistor, respectively, and the ninth resistor is connected to the first power source.
6. The inrush current protection power supply device according to claim 5, wherein the voltage of the first power supply is 15V.
7. The inrush current protection power supply of claim 1, wherein the second adjustable voltage element and the third adjustable voltage element are both a potentiometer or an adjustable resistor.
8. The inrush current protection power supply of claim 1, wherein the first and second subtraction amplifiers are each an LV29020 model amplifier.
9. A switching power supply, comprising a mains connection terminal, an inrush current protection power supply device as claimed in any one of claims 1 to 8 connected to the mains connection terminal, and a power supply output terminal connected to the inrush current protection power supply device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023351133.3U CN215120119U (en) | 2020-12-31 | 2020-12-31 | Switching power supply and power supply device for preventing surge current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023351133.3U CN215120119U (en) | 2020-12-31 | 2020-12-31 | Switching power supply and power supply device for preventing surge current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215120119U true CN215120119U (en) | 2021-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023351133.3U Active CN215120119U (en) | 2020-12-31 | 2020-12-31 | Switching power supply and power supply device for preventing surge current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215120119U (en) |
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2020
- 2020-12-31 CN CN202023351133.3U patent/CN215120119U/en active Active
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