CN216599409U - Bleeder circuit, board card and network equipment - Google Patents

Abstract

The specification provides a bleeder circuit, integrated circuit board and network equipment, relates to circuit technical field. A bleeder circuit is applied to a board card and comprises: the input end of the trigger unit is connected with the power supply input end, the output end of the trigger unit is connected with the first input end of the discharge unit, and the second input end of the discharge unit is connected with the power supply input end; when the power supply input end works normally, a first resistor in the trigger unit is communicated with the grounding end of the bleeder circuit through a first triode, and a second resistor in the bleeder circuit is disconnected with the grounding end through a second triode; when the power supply input end is powered off, a first resistor in the trigger unit is disconnected with the ground end through a first triode and outputs a trigger signal to the discharge unit, and the discharge unit conducts a second resistor and the ground end through a second triode based on the trigger signal; the resistance value of the second resistor is smaller than that of the first resistor. Through the scheme, the energy consumption of the board card in normal working can be reduced.

Description

Bleeder circuit, board card and network equipment

Technical Field

The present specification relates to the field of circuit technologies, and in particular, to a bleeder circuit, a board card, and a network device.

Background

With the popularization of networks, people have higher and higher requirements on the maintenance of network equipment. For high-density routing devices and switching devices, hot plugging of boards is one of the common requirements of current network devices. When the board card is plugged into the network equipment, the board card can be impacted by larger current because the network equipment is already in a charged state, so that the board card is damaged.

In order to avoid the problem, a slow starting circuit can be arranged on the board card, and the board card is slowly electrified through the charge and discharge of the energy storage element on the slow starting circuit so as to relieve the damage caused by the large current at the moment of electrification. However, the input end of the slow start circuit is connected to a system power supply of the network device, which causes the slow start circuit to be always in a charged state during the operation of the board card, and at this time, the energy storage element in the slow start circuit is also continuously in a leakage state, so that the power consumption of the board card is increased. In addition, the energy storage element of the load circuit is discharged, so that the consumption of electric energy is further improved. In a network equipment, a slow start circuit is arranged for each board card, so that the overall power consumption of the network equipment is undoubtedly greatly improved.

SUMMERY OF THE UTILITY MODEL

To overcome the problems in the related art, the present specification provides a bleeder circuit, a board card, and a network device.

In combination with the first aspect of the embodiments of the present specification, the present application provides a bleeding circuit, applied to a board card, including: the device comprises a trigger unit and a discharge unit;

the input end of the trigger unit is connected with the power supply input end, the output end of the trigger unit is connected with the first input end of the discharge unit, and the second input end of the discharge unit is connected with the power supply input end;

the triggering unit comprises a first resistor and a first triode, and the discharge unit comprises a second resistor and a second triode;

when the power supply input end works normally, a first resistor in the trigger unit is communicated with the grounding end of the bleeder circuit through a first triode, and a second resistor in the bleeder circuit is disconnected with the grounding end of the bleeder circuit through a second triode;

when the power supply input end is powered off, a first resistor in the trigger unit is disconnected with the grounding end of the bleeder circuit through a first triode and outputs a trigger signal to the bleeder unit, and the bleeder unit conducts a second resistor and the grounding end of the bleeder circuit through a second triode based on the trigger signal;

the resistance value of the second resistor is smaller than that of the first resistor.

Further, the trigger unit further includes: a third resistor and a fourth resistor; the bleeder unit, still include: a fifth resistor;

the first end of the first resistor is connected with the input end of the bleeder circuit, the first end of the third resistor is connected with the input end of the bleeder circuit, the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is connected with the ground end of the bleeder circuit;

the first end of the fifth resistor is connected with the input end of the bleeder circuit;

the control end of the first triode is respectively connected with the second end of the third resistor and the first end of the fourth resistor, the input end of the first triode is connected with the power input end, and the output end of the first triode is connected with the grounding end of the bleeder circuit;

the control end of the second triode is respectively connected with the second end of the first resistor and the input end of the first triode, the input end of the second triode is connected with the second end of the fifth resistor, and the output end of the second triode is connected with the grounding end of the bleeder circuit.

Optionally, the first transistor and the second transistor are MOS FETs.

Optionally, the first transistor and the second transistor are BJTs.

In combination with the second aspect of the embodiments of the present disclosure, the present disclosure provides a board card, which includes a slow start circuit, at least one bleeding circuit of any one of the above and a load circuit corresponding to each bleeding circuit, where the slow start circuit is connected to a system power supply.

Optionally, when the number of the bleeding circuits is greater than two, at least two bleeding circuits are cascaded;

and the second end of the second resistor of the previous-stage bleeder circuit is connected to the control end of the first triode of the next-stage bleeder circuit.

In combination with the third aspect of the embodiments of the present specification, the present application provides a network device, which includes a system power supply and at least one board card described above.

The technical scheme provided by the implementation mode of the specification can have the following beneficial effects:

in the embodiment of the specification, by arranging the bleeding circuit, when the network device is pulled out, the bleeding is performed through the second resistor, and when the network device normally works, the bleeding circuit is guaranteed to work in a low-energy consumption state through the first resistor with the resistance value larger than that of the second resistor, so that the network device is rapidly bled through a smaller resistor when being pulled out, and when the network device normally works, the work of the bleeding circuit and the load circuit is maintained with low energy consumption, so that the electric energy consumption of the board card is reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the specification.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present specification and together with the description, serve to explain the principles of the specification.

Fig. 1 is a schematic structural diagram of a board card according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a bleeder circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a board card according to another embodiment of the present application;

fig. 4 is a schematic structural diagram of a multi-stage bleeder circuit in accordance with another embodiment of the present application;

fig. 5 is a schematic structural diagram of a network device according to the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present specification.

In combination with the first aspect of the embodiments of the present specification, the present application provides a bleeding circuit, applied to a board card, as shown in fig. 1 and 2, including: a trigger unit and a bleed-off unit.

The board card is also provided with a slow starting circuit, the slow starting circuit comprises an energy storage element, such as a capacitor, and instantaneous large current generated when the board card is plugged into a slot position of the network equipment is avoided through the energy storage element. The slow start circuit is connected to a system power supply of the network device. In a network device, a system power supply introduces power to each board card through a backplane.

The input end of the trigger unit is connected with the power input end Vin1, the output end of the trigger unit is connected with the first input end of the bleeder unit, and the second input end of the bleeder unit is connected with the power input end Vin 1. The power input Vin1 is derived from the system power of the network device.

The triggering unit comprises a first resistor R1 and a first triode Q1, the bleeder unit comprises a second resistor R2 and a second triode Q2, and the resistance value of the second resistor R2 is smaller than that of the first resistor R1. The bleeder circuit is connected to the power input Vin1, receiving power from the power input Vin 1.

When the power input terminal Vin1 normally operates, the first resistor R1 in the trigger unit is connected to the ground GND of the bleeder circuit through the first transistor Q1, and the second resistor R2 in the bleeder circuit is disconnected from the ground GND of the bleeder circuit through the second transistor Q2. At this time, although the bleeder circuit also receives the power supply of the system power supply, the setting of the resistance value is large, so that the current in the bleeder circuit is small, and correspondingly, the energy consumption is relatively small. Correspondingly, under the condition of normal operation, if the energy storage element in the load circuit also needs to perform the discharge of the electric energy through the discharge unit in the discharge circuit, a smaller current can be maintained to reduce the electric energy consumption.

After the board card is pulled out by a worker, when the power supply input terminal Vin1 is powered off, the first resistor R1 in the trigger unit is disconnected from the ground terminal GND of the bleeder circuit through the first triode Q1, and outputs a trigger signal to the bleeder unit, and the bleeder unit switches on the second resistor R2 and the ground terminal GND of the bleeder circuit through the second triode Q2 based on the trigger signal.

After the board card is pulled out, because the power supply of the system power supply to the board card is removed, the voltage output by the slow start circuit on the board card begins to drop, and when the voltage drops to a certain value, the conduction of the first triode Q1 cannot be maintained, so that the first triode Q1 cuts off the path between the first resistor R1 and the ground terminal GND. After the path from the first resistor R1 to the ground GND is cut off by the first transistor Q1, the current (i.e., the trigger signal) flowing through the first resistor R1 is led to the bleeding unit, so that the second transistor Q2 is turned on, and the second resistor R2 is turned on with the ground GND, thereby bleeding the electric energy stored in the slow start circuit on the board card through the second resistor R2. Since the resistance of the second resistor R2 is set to be smaller than that of the first resistor R1, when the soft start circuit is switched to the bleeding unit to bleed off, the bleeding can be faster than that of the first resistor R1. Correspondingly, the energy storage element in the load circuit can also carry out rapid electric energy discharge based on the discharge circuit.

In the triggering unit and the bleeding unit, the first Transistor Q1 and the second Transistor Q2 may be selected and selectable, the first Transistor and the second Transistor may be MOS FETs (Metal Oxide semiconductor Field Effect transistors, Metal Oxide semiconductor-Conductor Field Effect transistors) or BJTs (Bipolar Junction transistors), the selection of specific devices may be set according to actual requirements, for example, the MOS FETs may be NMOS transistors or PMOS transistors, the BJTs may be NPN transistors or PNP transistors, and certainly, other devices having a selective conduction function may also be set, which is not limited to this. The first triode Q1 can be configured as an NMOS transistor, a PMOS transistor, an NPN transistor, or a PNP transistor, and the second triode Q2 needs to be configured as an NMOS transistor and an NPN transistor. The selection of the resistance values of the first resistor R1 and the second resistor R2 can also be set according to the actual bleeding requirement, and generally, the first resistor R1 can be set to be a kilo-ohm resistor, and the second resistor R2 can be set to be a dozen-ohm resistor. At this time, since the resistance of the second resistor R2 is small, the current flowing through the second resistor R2 is large, and the power on the second resistor R2 is higher under the same voltage, so that the electric energy can be discharged quickly on the second resistor R2.

The first transistor Q1 and the second transistor Q2 are NMOS transistors, and a board is provided as an example.

As shown in fig. 1 and 2, for the bleeding circuit, specifically, the trigger unit further includes: a third resistor R3 and a fourth resistor R4; the bleeder unit, still include: and a fifth resistor R5.

The first end of the first resistor R1 is connected with the input end of the bleeder circuit, the first end of the third resistor R3 is connected with the input end of the bleeder circuit, the first end of the fourth resistor R4 is connected with the second end of the third resistor R3, the second end of the fourth resistor R4 is connected with the ground end GND of the bleeder circuit, and the first end of the fifth resistor R5 is connected with the input end of the bleeder circuit.

The control terminal, the input terminal and the output terminal of the first transistor Q1 and the second transistor Q2 may be understood as a gate G, a source S and a drain D of an NMOS transistor, respectively.

The control end of the first triode Q1 is connected to the second end of the third resistor R3 and the first end of the fourth resistor R4, respectively, the input end of the first triode Q1 is connected to the power input terminal Vin, and the output end of the first triode Q1 is connected to the ground GND of the bleeder circuit.

The control end of the second triode Q2 is connected to the second end of the first resistor R1 and the input end of the first triode Q1, respectively, the input end of the second triode Q2 is connected to the second end of the fifth resistor R5, and the output end of the second triode Q2 is connected to the ground GND of the bleeder circuit.

Receiving system power when a board card is plugged into network equipmentWhen the source supplies power, the slow starting circuit on the board card receives electric energy and charges the energy storage element. During the charging process, the slow start circuit gradually supplies power to the load circuit at the rear side, and after the energy storage element is charged, stable power supply, such as 48-volt power supply, is continuously output to the load circuit. At this time, the power source connection terminal Vin1 in the bleeder circuit also reaches a steady state, and the voltage between the gate and the source of the first transistor Q1 is maintained at 2V (i.e., V) due to the voltage division arrangement of the third resistor R3 and the fourth resistor R4_GS1At 2 volts) the first transistor Q1 is in a conductive state (i.e., conduction between the source and drain). In this case, the voltage of the gate of the second transistor Q2 is pulled low by being conducted to the ground GND, so that the second transistor Q2 is in an off state. Because the conducting current is maintained at a small value through the first resistor R1 with a large resistance value, less electric energy can be consumed, and the power consumption of the board card in normal work is reduced.

Thereafter, if the staff pulls out the board card, the power supply will be cut off, and the energy storage element gradually releases the stored electric energy. Since there is no system power supply, the release will cause the voltage at the power input Vin1 to the bleeder circuit to drop, at which point V_GS1Also drops below 2 volts, causing the first transistor Q1 to switch to an off state.

At this time, the voltage V between the gate and the source of the second transistor Q2 is caused to be generated by the first resistor R1 and the fifth resistor R5_GS2Is pulled high (also 2 v for example), so that the second transistor Q2 is switched from the off state to the on state, and the second resistor R2 is conducted to the ground GND. Because the resistance value of the second resistor R2 is small, under the action of shunting, the current distributed by the second resistor R2 is large, and under the condition of consistent voltage, large electric energy is consumed on the second resistor R2, so that the power supply access end Vin1 is quickly discharged, and finally, after the discharge is completed, the second triode Q2 is restored to the off state.

Correspondingly, the present application provides a board, as shown in fig. 3, including at least one bleeding circuit of any one of the above-mentioned bleeding circuits and a load circuit corresponding to each bleeding circuit, where the board is connected to a system power supply.

Because the board card may be provided with multiple power supplies, that is, after the system power supply is connected to the board card, multiple power supplies of 48 volts, 12 volts, 5 volts and the like are differentiated based on the voltage transformation setting of the board card, and the power supply access end of each power supply is respectively connected to different slow start circuits and load circuits. At this moment, a plurality of bleeder circuits need to be arranged on the board card to be used for different power access ends.

When the multi-stage bleeder circuits need to be sequentially bled, the bleeder circuits can be sequentially bled, if the multi-stage bleeder circuits do not need to be sequentially bled, the bleeder circuits in the board card can respectively realize self bleeding.

In case a sequential bleeding needs to be achieved, i.e. when the number of bleeding circuits is larger than two, at least two bleeding circuits are cascaded. For example, as shown in fig. 4, the board card is provided with two stages of bleeding circuits.

Second resistor R of upper-stage bleeder circuit₂₁Is connected to the first triode Q of the next stage bleeder circuit₂₁The control terminal of (1).

Under the condition of normal operation, the slow starting circuit 1 and the slow starting circuit 2 are respectively charged and supply power to corresponding load circuits. After the board card is pulled out, the second resistor R in the bleeder circuit 1₂₁A first triode Q connected to the bleeder circuit 2 of the next stage₂₁. Second triode Q in bleeder circuit 1₁₂The leakage function of the leakage circuit 1 is started after being conducted, and the second resistor R in the leakage circuit 1 is not leaked until the energy storage element in the slow starting circuit 1 is not completely leaked₂₁To the first triode Q of the bleeder circuit 2₂₁Has a sustaining effect, at this time, the first triode Q of the bleeder circuit 2₂₁And maintained in an on state. Thereafter, when the power supply input terminal Vin1 of the bleeder circuit 1 drops to a certain condition, the first triode Q of the bleeder circuit 2₂₁To V_GS21Is less than 2 volts, resulting in the first transistor Q of the bleeder circuit 2₂₁Turning off the second triode Q of the bleeder circuit 2₂₂Switching from off state to on state to make the bleeder circuit 2 start to bleed off the slow starting circuit 2, so as to implementSequential bleeding between the multi-stage bleeding circuits is now present.

Certainly, according to different actual requirements, more board cards can be arranged on one board card to realize sequential discharge, and no limitation is made on the sequential discharge.

Correspondingly, the present application provides a network device, as shown in fig. 5, including a system power supply and at least one board card.

In the embodiment of the specification, by arranging the bleeding circuit, when the network device is pulled out, the bleeding is performed through the second resistor, and when the network device normally works, the bleeding circuit is guaranteed to work in a low-energy consumption state through the first resistor with the resistance value larger than that of the second resistor, so that the network device is rapidly bled through a smaller resistor when being pulled out, and when the network device normally works, the bleeding circuit and the load circuit are maintained to work with low energy consumption, and the electric energy consumption of the board card is reduced.

It will be understood that the present description is not limited to the precise arrangements described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

The above description is only for the purpose of illustrating the preferred embodiments of the present disclosure and is not to be construed as limiting the present disclosure, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure are intended to be included within the scope of the present disclosure.

Claims (7)

1. The bleeder circuit is characterized by being applied to a board card and comprising: the device comprises a trigger unit and a discharge unit;

the input end of the trigger unit is connected with the power supply input end, the output end of the trigger unit is connected with the first input end of the bleeder unit, and the second input end of the bleeder unit is connected with the power supply input end;

the trigger unit comprises a first resistor and a first triode, and the bleeder unit comprises a second resistor and a second triode;

when the power supply input end works normally, a first resistor in the trigger unit is communicated with the grounding end of the bleeder circuit through the first triode, and a second resistor in the bleeder circuit is disconnected with the grounding end of the bleeder circuit through the second triode;

when the power supply input end is powered off, a first resistor in the trigger unit is disconnected with the grounding end of the bleeder circuit through the first triode and outputs a trigger signal to the bleeder unit, and the bleeder unit conducts the second resistor and the grounding end of the bleeder circuit through the second triode based on the trigger signal;

and the resistance value of the second resistor is smaller than that of the first resistor.

2. The bleeder circuit as claimed in claim 1, wherein the trigger unit further comprises: a third resistor and a fourth resistor; the bleeding unit further comprises: a fifth resistor;

the first end of the first resistor is connected with the input end of the bleeder circuit, the first end of the third resistor is connected with the input end of the bleeder circuit, the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is connected with the ground end of the bleeder circuit;

the first end of the fifth resistor is connected with the input end of the bleeder circuit;

the control end of the first triode is respectively connected with the second end of the third resistor and the first end of the fourth resistor, the input end of the first triode is connected with the power input end, and the output end of the first triode is connected with the grounding end of the bleeder circuit;

the control end of the second triode is respectively connected with the second end of the first resistor and the input end of the first triode, the input end of the second triode is connected with the second end of the fifth resistor, and the output end of the second triode is connected with the grounding end of the bleeder circuit.

3. The bleeder circuit of claim 2, wherein the first transistor and the second transistor are metal oxide semiconductor field effect transistors (MOS) FETs.

4. The bleeding circuit of claim 2, wherein the first transistor and the second transistor are Bipolar Junction Transistors (BJTs).

5. A board card comprising a slow start circuit, at least one bleeder circuit according to any of claims 1 to 4, and a load circuit corresponding to each bleeder circuit, wherein the slow start circuit is connected to a system power supply.

6. The board card of claim 5, wherein when the number of bleeding circuits is greater than two, the at least two bleeding circuits are cascaded;

and the second end of the second resistor of the previous-stage bleeder circuit is connected to the control end of the first triode of the next-stage bleeder circuit.

7. A network device comprising a system power supply, at least one board of claim 5 or claim 6.

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