CN218603377U - Pre-charging circuit of switching power supply hot plug - Google Patents
Pre-charging circuit of switching power supply hot plug Download PDFInfo
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- CN218603377U CN218603377U CN202223095674.3U CN202223095674U CN218603377U CN 218603377 U CN218603377 U CN 218603377U CN 202223095674 U CN202223095674 U CN 202223095674U CN 218603377 U CN218603377 U CN 218603377U
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Abstract
The utility model discloses a pre-charge circuit of switching power supply hot plug, through setting up the power output terminal to including the pre-charge needle, positive output needle and negative output needle, and the length of pre-charge needle and negative output needle is greater than positive output needle, and with pre-charge needle and first resistance connection, when making the power supply terminal peg graft, by the pre-charge needle, first resistance, first electric capacity and negative output needle form the charging circuit and charge for first electric capacity, and when positive output needle inserts the back, pre-charge needle and first resistance are by the short circuit of positive output needle, make the electric current not flow through first resistance, thereby make the charging process of first electric capacity receive first resistance restriction, avoid the problem that output voltage reduces by a wide margin, make output voltage more stable in the power supply unit working process.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a pre-charge circuit of switching power supply hot plug.
Background
Hot plug (Hot Swap), i.e. Hot plugging, means that the module and the board card are plugged into or pulled out of the system without affecting the normal operation of the system under the condition of not shutting down the power supply of the system. In the application of the switching power supply, for example, in the scene when two power supplies work in parallel: if one power supply device is connected in, and another power supply device is connected in after the power supply device works normally, at the moment when the second power supply device is connected in, voltage sharing is completed in the moment because the charging and discharging of the capacitor in the power supply device are not limited, and the output voltage is reduced by half. Namely, when the power supply modules work in parallel, the power supply connected later pulls down the working power supply output, so that the output voltage of the power supply equipment is unstable in the working process.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that: the pre-charging circuit for the hot plug of the switching power supply is provided, and the problem that the voltage is greatly reduced when the power supply is parallel-connected to work is avoided.
In order to solve the technical problem, the utility model discloses a technical scheme be:
a pre-charging circuit for hot plug of a switch power supply comprises a power supply output terminal, a first resistor and a first capacitor; the power supply output terminal is used for outputting power supply;
the power output terminal comprises a pre-charging pin, a positive output pin and a negative output pin; the lengths of the pre-charging needle and the negative output needle are greater than that of the positive output needle;
one end of the first resistor is connected with the pre-charging pin, and the other end of the first resistor is respectively connected with one end of the first capacitor and the positive output pin;
the other end of the first capacitor is connected with the negative output pin.
Further, the pre-charging needle is the same length as the negative output needle.
Further, the device also comprises a second resistor;
one end of the second resistor is respectively connected with one end of the first resistor, which is far away from the pre-charging pin, one end of the first capacitor and the positive output pin;
the other end of the second resistor is connected with the other end of the first capacitor and the negative output pin respectively.
Further, the device also comprises a rectifying circuit;
the input end of the rectification circuit is used for being connected with the output of the preceding stage circuit;
the positive output end of the rectification circuit is connected with the positive output pin;
and the negative output end of the rectifying circuit is connected with the negative output needle.
Further, the rectifying circuit comprises a first rectifying diode, a second rectifying diode, a third rectifying diode and a fourth rectifying diode;
the anode of the first rectifying diode is connected with the cathode of the second rectifying diode and is used as the input end of the rectifying circuit; the negative electrode of the first rectifier diode is respectively connected with the negative electrode of the third rectifier diode and the positive output pin;
the cathode of the fourth rectifier diode is connected with the anode of the third rectifier diode and is used as the input end of the rectifier circuit; and the anode of the fourth rectifier diode is connected with the anode of the second rectifier diode and the negative output pin respectively.
Further, the device also comprises a first inductor and a second inductor;
one end of the first inductor is connected with the positive output end of the rectifying circuit, and the other end of the first inductor is connected with the positive output pin;
one end of the second inductor is connected with the negative output end of the rectifying circuit, and the other end of the second inductor is connected with the negative output pin.
Further, the device also comprises a third resistor and a sampling port;
one end of the third resistor is connected with the sampling port and the negative output end of the rectifying circuit respectively;
the other end of the third resistor is connected with the negative output pin.
The beneficial effects of the utility model reside in that: through setting up power output terminal to including the pre-charge needle, positive output needle and negative output needle, and the length of pre-charge needle and negative output needle is greater than positive output needle, and be connected pre-charge needle and first resistance, when making the power supply terminal peg graft, by the pre-charge needle, first resistance, first electric capacity and negative output needle form the charging circuit and charge for first electric capacity, and after positive output needle inserts, pre-charge needle and first resistance are by the short circuit of positive output needle, make the electric current not flow through first resistance, thereby make the charging process of first electric capacity receive first resistance restriction, avoid the problem that output voltage reduces by a wide margin, make output voltage more stable in the power equipment course of operation.
Drawings
Fig. 1 is a schematic connection diagram of a precharge circuit for hot plug of a switching power supply according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a usage scenario of a pre-charging circuit for hot plugging of a switching power supply according to an embodiment of the present invention;
description of reference numerals:
r1, a first resistor; r2 and a second resistor; r3, a third resistor; c1, a first capacitor; L1-A, a first inductor; L1-B and a second inductor; p1+ OUT, pre-charge needle; p2+ OUT, positive output pin; P3-OUT, negative output pin; IO, sampling port; d1, a first rectifier diode; d2, a second rectifier diode; d3, a third rectifier diode; d4, a fourth rectifying diode.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a switching power supply hot swap pre-charge circuit includes a power output terminal, a first resistor and a first capacitor; the power supply output terminal is used for outputting power supply;
the power supply output terminal comprises a pre-charging pin, a positive output pin and a negative output pin; the lengths of the pre-charging needle and the negative output needle are greater than that of the positive output needle;
one end of the first resistor is connected with the pre-charging pin, and the other end of the first resistor is respectively connected with one end of the first capacitor and the positive output pin;
the other end of the first capacitor is connected with the negative output pin.
As can be seen from the above description, the utility model has the advantages that: through setting up power output terminal to including the pre-charge needle, positive output needle and negative output needle, and the length of pre-charge needle and negative output needle is greater than positive output needle, and be connected pre-charge needle and first resistance, when making the power supply terminal peg graft, by the pre-charge needle, first resistance, first electric capacity and negative output needle form the charging circuit and charge for first electric capacity, and after positive output needle inserts, pre-charge needle and first resistance are by the short circuit of positive output needle, make the electric current not flow through first resistance, thereby make the charging process of first electric capacity receive first resistance restriction, avoid the problem that output voltage reduces by a wide margin, make output voltage more stable in the power equipment course of operation.
Further, the pre-charging needle is the same length as the negative output needle.
As can be seen from the above description, the length of the pre-charge pin and the length of the negative output pin are set to be the same, so that when the power terminal is plugged, the pre-charge pin and the negative output pin can be simultaneously connected to form a loop, thereby avoiding the influence of the length on the charging time of the first capacitor.
Further, a second resistor is also included;
one end of the second resistor is respectively connected with one end of the first resistor, which is far away from the pre-charging pin, one end of the first capacitor and the positive output pin;
the other end of the second resistor is connected with the other end of the first capacitor and the negative output pin respectively.
As can be seen from the above description, by providing the second resistor and connecting the second resistor in parallel to the two ends of the first capacitor, the second resistor plays a role of outputting a dummy load, so that the precharge circuit maintains a stable voltage when no load occurs, and is used to discharge the electric energy remaining in the first capacitor, thereby improving the stability of the circuit.
Further, the device also comprises a rectifying circuit;
the input end of the rectification circuit is used for being connected with the output of the preceding stage circuit;
the positive output end of the rectification circuit is connected with the positive output pin;
and the negative output end of the rectifying circuit is connected with the negative output needle.
As can be seen from the above description, the rectifier circuit can convert the ac power input by the preceding stage circuit into dc power for output.
Further, the rectifying circuit comprises a first rectifying diode, a second rectifying diode, a third rectifying diode and a fourth rectifying diode;
the anode of the first rectifier diode is connected with the cathode of the second rectifier diode and is used as the input end of the rectifier circuit; the negative electrode of the first rectifier diode is connected with the negative electrode of the third rectifier diode and the positive output pin respectively;
the negative electrode of the fourth rectifier diode is connected with the positive electrode of the third rectifier diode and is used as the input end of the rectifier circuit; and the anode of the fourth rectifier diode is respectively connected with the anode of the second rectifier diode and the negative output pin.
According to the above description, the first rectifier diode, the second rectifier diode, the third rectifier diode and the fourth rectifier diode form the rectifier circuit, so that the input alternating current can be effectively converted into direct current, and the first capacitor can provide direct current power output for other equipment while normal heavy discharge can be ensured.
Further, the device also comprises a first inductor and a second inductor;
one end of the first inductor is connected with the positive output end of the rectifying circuit, and the other end of the first inductor is connected with the positive output pin;
one end of the second inductor is connected with the negative output end of the rectifying circuit, and the other end of the second inductor is connected with the negative output pin.
As can be seen from the above description, the output common mode inductor is formed by arranging the first inductor and the second inductor, so as to play a role in effectively filtering the output ripple of the switching power supply.
Further, the device also comprises a third resistor and a sampling port;
one end of the third resistor is connected with the sampling port and the negative output end of the rectifying circuit respectively;
the other end of the third resistor is connected with the negative output pin.
As can be seen from the above description, a sampling loop is formed by arranging the third resistor and the sampling port, so that a tester can sample the pre-charging circuit through the sampling port, and the pre-charging circuit is conveniently tested.
The above-mentioned pre-charge circuit of switching power supply hot plug of this embodiment can be applicable to the power supply unit of parallel operation, if add the pre-charge circuit at the output of switching circuit, can avoid the problem that output voltage reduces by a wide margin, explains through the detailed implementation mode below:
example one
Referring to fig. 1, a switching power supply hot swap pre-charge circuit includes a power output terminal, a first resistor R1 and a first capacitor C1; the power supply output terminal is used for outputting power supply; the power output terminal comprises a pre-charging pin P1+ OUT, a positive output pin P2+ OUT and a negative output pin P3-OUT; the lengths of the pre-charging pin P1+ OUT and the negative output pin P3-OUT are greater than the length of the positive output pin P2+ OUT; one end of the first resistor R1 is connected to the pre-charge pin P1+ OUT, and the other end of the first resistor R1 is connected to one end of the first capacitor C1 and the positive output pin P2+ OUT, respectively; the other end of the first capacitor C1 is connected with the negative output pin P3-OUT; the first resistor R1 is a hot-plug pre-charging resistor; the first capacitor C1 is provided with a positive electrode and a negative electrode, one end of the positive electrode is connected with the positive output pin P2+ OUT, and one end of the negative electrode is connected with the negative output pin P3-OUT; the power output terminal is divided into a male head and a female head, the female head is a power supply end, the male head is a bracket backboard end, and when the power supply is powered on, the male head is plugged with the female head to realize power supply of the power supply; in an alternative embodiment, the pre-charge pin P1+ OUT is the same length as the negative output pin P3-OUT;
the specific principle is as follows:
in the process of plugging the male connector and the female connector of the power output terminal, because the lengths of the pre-charge pin P1+ OUT and the negative output pin P3-OUT are longer, the pre-charge pin P1+ OUT and the negative output pin P3-OUT are firstly connected into a circuit, namely, at the moment, the pre-charge pin P1+ OUT, the negative output pin P3-OUT, the first resistor R1 and the first capacitor C1 form a charging loop to charge the first capacitor C1; then, after the positive output pin P2+ OUT is plugged in, the first resistor R1 and the pre-charge pin P1+ OUT are short-circuited, that is, the positive output pin P2+ OUT, the negative output pin P3-OUT and the first capacitor C1 form a loop for outputting; the first capacitor C1 is partially charged or fully charged before power supply output is carried out, so that the voltage drop amplitude can be greatly reduced;
the charging degree is related to the plugging speed, the parameters of the first resistor R1 and the first capacitor C1 and the length difference of a pre-charging pin P1+ OUT, a positive output pin P2+ OUT and a negative output pin P3-OUT; in a specific embodiment, the output is 48V, the capacitance of the first capacitor C1 is 1000uF, and the first resistor R1 is 2 Ω, and the corresponding time constant τ = R1C1=2ms, and the electric quantity of 63%/86%/95%/48V is charged under 1/2/3 of the time constants, i.e. the smaller the resistance of the first resistor R1, the smaller the time constant, i.e. the faster the charging speed; if the size difference of the long and short pins is L, V is the hot plugging speed, T is the time from the contact of the long pin to the contact of the short pin (namely the pre-charging time), L = V x T; therefore, under the same speed, the larger the size difference of the long pin and the short pin, the longer the pre-charging time is given; under the condition of not influencing other parameters, the larger the size difference of the long pin and the short pin is, the smaller the resistance value of the first resistor R1 is, and the more sufficient the pre-charging of the first capacitor C1 is;
in an optional embodiment, the sampling circuit further comprises a second resistor R2, a rectifying circuit, a first inductor L1-a, a second inductor L1-B, a third resistor R3 and a sampling port IO;
one end of the second resistor R2 is connected to one end of the first resistor R1, which is far away from the pre-charging pin P1+ OUT, one end of the first capacitor C1, and the positive output pin P2+ OUT, respectively; the other end of the second resistor R2 is connected with the other end of the first capacitor C1 and the negative output pin P3-OUT respectively; the second resistor R2 is a circuit output dummy load;
the input end of the rectification circuit is used for being connected with the output of the preceding stage circuit; the positive output end of the rectifying circuit is connected with the positive output pin P2+ OUT; the negative output end of the rectifier circuit is connected with the negative output pin P3-OUT, and in an optional embodiment, the rectifier circuit comprises a first rectifier diode D1, a second rectifier diode D2, a third rectifier diode D3 and a fourth rectifier diode D4; the anode of the first rectifier diode D1 is connected with the cathode of the second rectifier diode D2 and is used as the input end of the rectifier circuit; the cathode of the first rectifier diode D1 is respectively connected with the cathode of the third rectifier diode D3 and the positive output pin P2+ OUT; the negative electrode of the fourth rectifier diode D4 is connected with the positive electrode of the third rectifier diode D3 and is used as the input end of the rectifier circuit; the positive electrode of the fourth rectifier diode D4 is connected with the positive electrode of the second rectifier diode D2 and the negative output pin P3-OUT respectively;
one end of the first inductor L1-A is connected with the positive output end of the rectifying circuit, and the other end of the first inductor L1-A is connected with the positive output pin P2+ OUT; one end of the second inductor L1-B is connected with the negative output end of the rectifying circuit, and the other end of the second inductor L1-B is connected with the negative output pin P3-OUT; the first inductor L1-A and the second inductor L1-B are output common mode inductors and play a role in filtering circuit ripples;
the third resistor R3 is an output current sampling resistor, and one end of the third resistor R3 is connected with the sampling port IO and the negative output end of the rectifying circuit respectively; the other end of the third resistor R3 is connected with the negative output pin P3-OUT;
fig. 2 shows a specific circuit application scenario of the switching power supply hot swap precharge circuit; the EMC circuit filters and rectifies and converts the input commercial power, and the PFC boost main circuit boosts the voltage and outputs the boosted voltage to a front-stage circuit of the pre-charging circuit; the rectification circuit is connected with the preceding stage circuit through a transformer to form a DC-DC (direct current-direct current) circuit, and finally, the power output is realized through a pre-charging circuit; when two power supplies work in parallel (namely two groups of circuits shown in fig. 2 work in parallel), after one power supply is connected to work normally, the other power supply is connected to the other power supply, and the second power supply is connected to the other power supply in a pre-charging process, so that when the second power supply is completely connected to the second power supply, the capacitor is stored with electric energy or is fully charged, and the output voltage cannot drop.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (7)
1. A pre-charging circuit for hot plug of a switch power supply is characterized by comprising a power supply output terminal, a first resistor and a first capacitor; the power supply output terminal is used for outputting power supply;
the power supply output terminal comprises a pre-charging pin, a positive output pin and a negative output pin; the lengths of the pre-charging needle and the negative output needle are greater than that of the positive output needle;
one end of the first resistor is connected with the pre-charging pin, and the other end of the first resistor is respectively connected with one end of the first capacitor and the positive output pin;
the other end of the first capacitor is connected with the negative output pin.
2. The hot-swap pre-charge circuit for a switching power supply according to claim 1, wherein the pre-charge pin is the same length as the negative output pin.
3. The pre-charging circuit for the hot plug of the switching power supply according to claim 1, further comprising a second resistor;
one end of the second resistor is respectively connected with one end of the first resistor, which is far away from the pre-charging pin, one end of the first capacitor and the positive output pin;
the other end of the second resistor is connected with the other end of the first capacitor and the negative output pin respectively.
4. The switching power supply hot plug precharge circuit according to claim 1, further comprising a rectification circuit;
the input end of the rectification circuit is used for being connected with the output of the preceding stage circuit;
the positive output end of the rectification circuit is connected with the positive output pin;
and the negative output end of the rectifying circuit is connected with the negative output needle.
5. The switching power supply hot swap pre-charge circuit as claimed in claim 4, wherein the rectifying circuit comprises a first rectifying diode, a second rectifying diode, a third rectifying diode and a fourth rectifying diode;
the anode of the first rectifier diode is connected with the cathode of the second rectifier diode and is used as the input end of the rectifier circuit; the negative electrode of the first rectifier diode is connected with the negative electrode of the third rectifier diode and the positive output pin respectively;
the negative electrode of the fourth rectifier diode is connected with the positive electrode of the third rectifier diode and is used as the input end of the rectifier circuit; and the anode of the fourth rectifier diode is connected with the anode of the second rectifier diode and the negative output pin respectively.
6. The switching power supply hot swap pre-charge circuit according to claim 4, further comprising a first inductor and a second inductor;
one end of the first inductor is connected with the positive output end of the rectifying circuit, and the other end of the first inductor is connected with the positive output pin;
one end of the second inductor is connected with the negative output end of the rectifying circuit, and the other end of the second inductor is connected with the negative output pin.
7. The hot-swap pre-charge circuit for the switching power supply according to claim 4, further comprising a third resistor and a sampling port;
one end of the third resistor is connected with the sampling port and the negative output end of the rectifying circuit respectively;
the other end of the third resistor is connected with the negative output pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223095674.3U CN218603377U (en) | 2022-11-17 | 2022-11-17 | Pre-charging circuit of switching power supply hot plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223095674.3U CN218603377U (en) | 2022-11-17 | 2022-11-17 | Pre-charging circuit of switching power supply hot plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218603377U true CN218603377U (en) | 2023-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223095674.3U Active CN218603377U (en) | 2022-11-17 | 2022-11-17 | Pre-charging circuit of switching power supply hot plug |
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|---|---|
| CN (1) | CN218603377U (en) |
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- 2022-11-17 CN CN202223095674.3U patent/CN218603377U/en active Active
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