Voltage stabilizing circuit, board card and frame type product with backboard

Abstract

The utility model discloses a voltage stabilizing circuit, a board card and a frame type product with a backboard, and relates to the technical field of electronics, the voltage stabilizing circuit is connected between a hot plug circuit and a connector and is used for providing transient charging current for other board cards which are newly inserted into the backboard, the voltage stabilizing circuit comprises a current limiting module, a first end of the current limiting module is connected with the connector, and a second end of the current limiting module is connected with the connector; the first end of the energy storage module is connected with the second end of the current limiting module, and the second end is grounded; the first end of the switch module is connected with the connector, and the second end is connected with the first end of the energy storage module; the switch module is used for controlling connection and disconnection between the energy storage module and the connector, and the current limiting module is used for limiting charging current when current is input into the energy storage module. When a new board card is inserted into the backboard, energy can be output through the energy storage module and the input module in the voltage stabilizing circuit, so that the voltage stability of the backboard can be maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of electronics, in particular to a voltage stabilizing circuit, a board card and a backplane frame type product. Background Art

[0002] In a frame switch, the system main power supply first outputs from the power supply module to the backplane, and then is connected to different power sockets on the backplane through wiring. Each pluggable board card obtains power supply from the power socket. Since the pluggable board card has an input capacitor, a transient large current will flow from the backplane to the newly inserted board card at the moment of hot insertion to charge its input capacitor.

[0003] To maintain the stability of the backplane voltage, the conventional method is to add Bulk (large) capacitors on the backplane to store energy. When a new board card is inserted, the Bulk capacitors provide the energy required for the transient current. In addition, there are also some products that do not use energy storage capacitors on the backplane. When a new board card is inserted, the output capacitors of the power supply module and the input capacitors of each online board card jointly provide the energy required for the transient charging current.

[0004] The scheme of adding Bulk capacitors on the backplane reduces the reliability of the backplane. When the capacitors on the backplane are damaged, the chassis needs to be repaired, resulting in the interruption of the normal operation of all board cards on this chassis. In the scheme of providing energy by the output capacitors of the power supply module and the input capacitors of each online board card, the output capacitors of the power supply module are far from the backplane and it is difficult to provide sufficient charging current in time; and the energy provided by the input capacitors on the online board cards to the backplane is related to their input capacitors. The larger the input capacitor, the more energy can be provided. However, when it is an inserted board card, the larger the input capacitor, the more energy needs to be absorbed from the backplane, and the greater the backplane voltage fluctuation will be. Therefore, in the scheme of jointly providing the transient charging current by the output capacitors of the power supply module and the input capacitors of each online board card, the backplane voltage fluctuation will be relatively large, which may affect the normal operation of other circuits.

[0005] In summary, how to reduce the impact of hot-pluggable board cards on the backplane voltage has become an urgent technical problem in this field. Summary of the Utility Model

[0006] The main purpose of the utility model is to provide a voltage stabilizing circuit, a board card and a backplane frame type product, aiming to solve the technical problem of how to reduce the impact of hot-pluggable board cards on the backplane voltage.

[0007] To achieve the above purpose, the utility model provides a voltage stabilizing circuit, which is connected between the hot plugging circuit and the connector and is used to provide a transient charging current to other board cards newly inserted into the backplane. The voltage stabilizing circuit includes:

[0008] A current limiting module, the first end of the current limiting module is connected to the connector;

[0009] Energy storage module, the first end of the energy storage module is connected to the second end of the current limiting module, and the second end of the energy storage module is grounded;

[0010] Switch module, the first end of the switch module is connected to the connector, and the second end of the switch module is connected to the first end of the energy storage module;

[0011] The switch module is used to control the on-off between the energy storage module and the connector, and the current limiting module is used to limit the charging current of the energy storage module when there is current input; the energy storage module is used to provide a transient charging current for other newly inserted backplane boards through the connector.

[0012] Optionally, the current limiting module includes a current limiting resistor, and the first end of the current limiting resistor is connected to the connector;

[0013] The energy storage module includes an energy storage capacitor, the first end of the energy storage capacitor is connected to the second end of the current limiting module, and the second end of the energy storage capacitor is grounded;

[0014] The switch module includes a switching device, and the switching device is an active electronic switching device or a passive electronic switching device.

[0015] Optionally, the switching device is a passive diode, the negative pole of the passive diode is connected to the connector, and the positive pole of the passive diode is connected to the first end of the energy storage capacitor.

[0016] In addition, to achieve the above object, the present invention also provides a board, including a voltage stabilizing circuit; the voltage stabilizing circuit is used to provide a transient charging current for other newly inserted backplane boards, and the board is configured as the voltage stabilizing circuit described above.

[0017] Optionally, the board further includes a hot plug circuit, a connector and an input capacitor;

[0018] The first end of the input capacitor is connected to the connector, the second end of the input capacitor is grounded, and the capacitance value of the input capacitor is smaller than the capacitance value of the energy storage capacitor. The input capacitor is used to maintain the stability of the input voltage and discharge outward through the connector;

[0019] The hot plug circuit is connected to the connector;

[0020] The voltage stabilizing circuit is connected between the input capacitor and the connector.

[0021] Optionally, the switching device remains closed when the board is not working properly, and the switching device is turned on when the board is working properly.

[0022] Optionally, the hot-swap circuit includes a detection resistor, a hot-swap control module, and a field-effect transistor;

[0023] The first end of the detection resistor is connected to the first end of the input capacitor;

[0024] The first end and the second end of the hot-swap control module are respectively connected to both ends of the detection resistor;

[0025] The drain of the field-effect transistor is connected to the second end of the detection resistor, the gate of the field-effect transistor is connected to the third end of the hot-swap control module, and the source of the field-effect transistor is connected to the output end of the hot-swap circuit and the fourth end of the hot-swap control module.

[0026] In addition, to achieve the above object, the present invention also provides a backplane frame product, including a board; the board includes a voltage stabilizing circuit for providing a transient charging current to other boards newly inserted into the backplane, and the board is configured as the voltage stabilizing circuit as described above.

[0027] Optionally, the backplane frame product includes a backplane, a long wire, and a power module;

[0028] The backplane includes a plurality of connectors, and the backplane is used to connect with the board through the connectors;

[0029] The long wire is used to connect the backplane and the power module.

[0030] Optionally, the power module includes a DC power supply and a filter capacitor.

[0031] In the technical solution of the present invention, by designing a voltage stabilizing circuit connected between the hot-swap circuit and the connector, the voltage stabilizing circuit can provide a transient charging current to a new board when a new board is inserted into the backplane, so as to maintain the stability of the backplane voltage. Specifically, the voltage stabilizing circuit includes a current-limiting resistor, a switching device, and an energy storage capacitor. The energy storage capacitor is much larger than the input capacitor. When the board is inserted into the backplane, the switching device is open, and the current-limiting resistor limits the current on the energy storage capacitor to a negligible size. At this time, the backplane only needs to charge the input capacitor. After the backplane works normally, the energy storage capacitor is charged through the current-limiting resistor, and the switching device is connected. Then, when a new board is inserted, the energy storage capacitor and the input capacitor jointly discharge to the new board. Since the energy storage capacitor is much larger than the input capacitor, the energy output by the board is much larger than the energy required when the new board is inserted, so as to maintain the stability of the backplane voltage. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for describing the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0033] Figure 1 It is a schematic diagram of the module of the voltage stabilizing circuit of the present invention;

[0034] Figure 2 It is a schematic circuit diagram of the voltage stabilizing circuit of the present invention;

[0035] Figure 3 It is a schematic circuit diagram of the voltage stabilizing circuit of the present invention;

[0036] Figure 4 It is a schematic circuit diagram of the board of the present invention;

[0037] Figure 5 It is a schematic circuit diagram of the backplane frame type product of the present invention.

[0038] Explanation of the reference numerals in the drawings:

[0039] Label Name Label Name R1 Current-limiting resistor C1 Energy storage capacitor SW1 Switching device C2 Input capacitor D1 Passive diode R2 Detection resistor Q1 Field effect transistor U1 Hot-swap control module CIN Input capacitor R Current-limiting resistor C Energy storage capacitor SW Switching device 10 Current-limiting module 20 Energy storage module 30 Switching module 01 Voltage regulation circuit 02 Connector 03 Hot-swap circuit 04 Backplane 05 Power supply module

[0040] The realization of the object of the present invention, the functional characteristics and advantages will be further described in conjunction with the embodiments with reference to the drawings. Specific embodiments

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0042] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0044] Referring to Figure 1 as shown, Figure 1 FIG. is a schematic circuit diagram of a voltage stabilizing circuit 01 proposed by the present utility model. The voltage stabilizing circuit 01 is connected between a hot plugging circuit 03 and a connector 02 and is used to provide a transient charging current to a board newly inserted into the backplane. The voltage stabilizing circuit 01 includes:

[0045] A current limiting module 10, the first end of the current limiting module is connected to the connector 02;

[0046] An energy storage module 20, the first end of the energy storage module is connected to the second end of the current limiting module, and the second end of the energy storage module is grounded;

[0047] A switch module 30, the first end of the switch module is connected to the connector 02, and the second end of the switch module is connected to the first end of the energy storage module;

[0048] The switch module is used to control the on / off between the energy storage module and the connector 02, and the current limiting module is used to limit the charging current of the energy storage module when there is current input; the energy storage module is used to provide a transient charging current to a board newly inserted into the backplane through the connector 02.

[0049] In this embodiment, between the voltage stabilizing circuit 01 and the hot plugging circuit 03, as Figure 1 shown, an input capacitor C2 is connected. The function of the current limiting module is to limit the current input to the energy storage module when there is current input, so as to avoid the energy storage module absorbing a transient large current from the backplane when the board is inserted.

[0050] Optionally, please refer to Figure 2 , the current limiting module includes a current limiting resistor R1, and the first end of the current limiting resistor R1 is connected to the connector 02;

[0051] The energy storage module includes an energy storage capacitor C1, the first end of the energy storage capacitor is connected to the second end of the current limiting module, and the second end of the energy storage capacitor is grounded;

[0052] The switch module includes a switching device SW1, and the switching device is an active electronic switching device or a passive electronic switching device.

[0053] In addition, in the board where the voltage regulation circuit 01 is located, an input capacitor C2 is further provided between the connector 02 and the hot-swap circuit 03. The first end of the input capacitor C2 is connected to the connector 02, the second end of the input capacitor C2 is grounded, the capacitance value of the input capacitor C2 is smaller than the capacitance value of the energy storage capacitor C1, and the input capacitor C2 is used to maintain the stability of the input voltage and can be discharged outward through the connector 02 at the same time;

[0054] The switching device is used to control the on-off between the energy storage capacitor and the connector 02, and the current-limiting resistor is used to limit the charging current when current is input into the energy storage capacitor.

[0055] Optionally, the switching device SW1 is an active electronic switching device or a passive electronic switching device.

[0056] In this embodiment, in the existing conventional design, the board power input end includes an input capacitor C2 and a hot-swap circuit 03. When the board is inserted into the backplane, due to the slow start characteristic of the hot-swap circuit 03, the hot-swap circuit 03 basically does not absorb energy during the board insertion process, but the voltage across C2 will instantaneously rise from 0V to the voltage value corresponding to the backplane power supply, and all the required energy is obtained from the backplane, resulting in backplane voltage fluctuations.

[0057] In order to keep the backplane voltage stable, the present utility model adds a group of R / C / SW circuits to the power input end of each board, where R1 is a current-limiting resistor for limiting the charging current of the capacitor C1 during hot insertion of the board; C1 is an energy storage capacitor, and its capacitance value is much larger than the capacitance value of C2; SW1 is an active electronic switching device, such as a triode, MOSFET, relay, etc., and SW1 is closed and connected only after the board enters the normal working state.

[0058] For the board to be inserted, SW1 is in the open state, and the current-limiting resistor R1 can limit the charging current of C1 to a negligible level. Therefore, only C2 needs to be charged when the board is inserted, and the effective input capacitor is C2. For the online board, SW1 is in the closed state, and the effective input capacitor at the power input end of the online board is C1 + C2.

[0059] When a new board is inserted, the energy stored in the C1 and C2 capacitors of the online board is discharged to the C2 of the new board at the same time. Since C1 + C2 is much larger than C2, the energy stored at the power input end of the online board is much larger than the energy required when the new board is inserted, thereby maintaining the stability of the backplane voltage.

[0060] Optionally, as Figure 3As shown, the switching device SW1 is a passive diode D1. The negative electrode of the passive diode is connected to the connector 02, and the positive electrode of the passive diode is connected to the first end of the energy storage capacitor.

[0061] In this embodiment, due to the forward conduction characteristic of the diode, the energy stored in the capacitor C1 on the circuit board can quickly discharge through the diode D1 to provide energy for the backplane. Due to the reverse cut-off characteristic of the diode, D1 is in the cut-off state after the new circuit board is inserted, and the capacitor C1 can only be charged through the current-limiting resistor R1, and the charging current can be ignored.

[0062] The present invention also provides a circuit board, which includes a voltage stabilization circuit 01. The voltage stabilization circuit 01 is used to provide a transient charging current to other circuit boards newly inserted into the backplane. The structure of the voltage stabilization circuit 01 can refer to the above embodiment and will not be elaborated here. Naturally, since the circuit board in this embodiment adopts the technical solution of the above voltage stabilization circuit 01, this circuit board has all the beneficial effects of the above voltage stabilization circuit 01.

[0063] Optionally, please refer to Figure 4 , the circuit board further includes a hot-swap circuit 03 and a connector 02, and the voltage stabilization circuit 01 is connected between the hot-swap circuit 03 and the connector 02.

[0064] Optionally, when the circuit board is not working properly, the switching device remains closed, and when the circuit board is working properly, the switching device is turned on.

[0065] Optionally, the hot-swap circuit 03 includes a detection resistor R2, a hot-swap control module U1, and a field effect transistor Q1;

[0066] The first end of the detection resistor is connected to the first end of the input capacitor;

[0067] The first end and the second end of the hot-swap control module are respectively connected to both ends of the detection resistor;

[0068] The drain of the field effect transistor is connected to the second end of the detection resistor, the gate of the field effect transistor is connected to the third end of the hot-swap control module, and the source of the field effect transistor is connected to the output end of the hot-swap circuit 03 and the fourth end of the hot-swap control module.

[0069] In this embodiment, the voltage stabilization circuit 01 is arranged between the hot-swap circuit 03 and the connector 02. When the circuit board is inserted, the charging current of the energy storage capacitor is very small and can be ignored. Only the input capacitor needs to absorb the transient charging current. When other circuit boards are inserted, the energy storage capacitor and the input capacitor in the voltage stabilization circuit 01 of the online circuit board discharge to other circuit boards.

[0070] In the hot-swap circuit 03, the MOSFET is mainly used as the main power control switch, and the detection resistor is used to detect the current of the circuit.

[0071] The present utility model also provides a backplane frame-type product, and the backplane frame-type product includes a board card. The board card includes a voltage stabilizing circuit 01 for protecting the backplane frame-type product. The structure of the voltage stabilizing circuit 01 can refer to the above embodiments and will not be elaborated herein. Naturally, since the backplane frame-type product of this embodiment adopts the technical solution of the above voltage stabilizing circuit 01, the backplane frame-type product has all the beneficial effects of the above voltage stabilizing circuit 01.

[0072] Optionally, please refer to Figure 5 , the backplane frame-type product includes a backplane 04, a long wire, and a power supply module 05;

[0073] The backplane 04 includes a plurality of connectors 02, and the backplane 04 is used to connect to the board card through the connectors 02;

[0074] The long wire is used to connect the backplane 04 and the power supply module 05.

[0075] Optionally, the power supply module 05 includes a DC power supply and a filter capacitor.

[0076] In this embodiment, the output of the power supply module 05 is connected to the backplane 04 through a long wire, and is transferred to the power input sockets of each pluggable board card through copper foil traces on the backplane 04. There is no Bulk energy storage capacitor on the backplane 04. The power supply module 05 and the online board card are in a normal working state. Since the board card supports hot swapping, it is allowed to insert a new board card without powering off the entire frame.

[0077] As Figure 5 shown, the structure of the board card to be inserted is the same as that of the inserted online board card. When the first board card is inserted into the backplane based on the connector 02, the backplane 04 charges the CIN input capacitor through the power supply module. Since the switch SW is open and limited by the current limiting resistor R, the charging current of the energy storage capacitor is very small. After the online board card works normally, the energy storage capacitor is charged through the current limiting resistor, and the switch is closed. When a new board card to be inserted is inserted into the backplane 04, the energy storage capacitor and the input capacitor discharge to the new board card to be inserted at the same time, and the current flow direction is as shown by the arrow in Figure 5 . Since the energy output by the online board card is much greater than the energy required by the board card to be inserted, the backplane does not need to supply compensated power and can maintain voltage stability.

[0078] It should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or system comprising such element.

[0079] The serial numbers of the above embodiments of the present utility model are only for description and do not represent the superiority or inferiority of the embodiments.

[0080] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present utility model, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium as described above (such as ROM / RAM, magnetic disk, optical disc) and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present utility model.

[0081] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural or equivalent process transformation made by using the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A voltage stabilizing circuit, characterized in that, The voltage stabilizing circuit is connected between the hot-swap circuit and the connector, and is used to provide a transient charging current to other boards newly inserted into the backplane. The voltage stabilizing circuit includes: A current limiting module, the first end of the current limiting module is connected to the connector; An energy storage module, the first end of the energy storage module is connected to the second end of the current limiting module, and the second end of the energy storage module is grounded; A switching module, the first end of the switching module is connected to the connector, and the second end of the switching module is connected to the first end of the energy storage module; The switching module is used to control the on / off between the energy storage module and the connector, and the current limiting module is used to limit the charging current when current is input into the energy storage module; the energy storage module is used to provide a transient charging current to other boards newly inserted into the backplane through the connector.

2. The voltage stabilizing circuit according to claim 1, characterized in that, The current limiting module includes a current limiting resistor, and the first end of the current limiting resistor is connected to the connector; The energy storage module includes an energy storage capacitor, the first end of the energy storage capacitor is connected to the second end of the current limiting module, and the second end of the energy storage capacitor is grounded; The switching module includes a switching device, and the switching device is an active electronic switching device or a passive electronic switching device.

3. The voltage stabilizing circuit according to claim 2, wherein, The switching device is a passive diode, the negative pole of the passive diode is connected to the connector, and the positive pole of the passive diode is connected to the first end of the energy storage capacitor.

4. A board card, characterized in that, The board includes the voltage stabilizing circuit according to any one of claims 1 to 3.

5. The board card according to claim 4, characterized in that, The board further includes: a hot-swap circuit, a connector, and an input capacitor; The first end of the input capacitor is connected to the connector, the second end of the input capacitor is grounded, and the capacitance value of the input capacitor is smaller than the capacitance value of the energy storage capacitor in the voltage stabilizing circuit. The input capacitor is used to maintain the stability of the input voltage and discharge outward through the connector; The hot-swap circuit is connected to the connector; The voltage stabilizing circuit is connected between the input capacitor and the connector.

6. The board card according to claim 5, wherein, The switching device in the voltage stabilizing circuit remains off when the board is not working properly, and the switching device turns on when the board is working properly.

7. The board card according to claim 6, characterized in that, The hot-swap circuit includes a detection resistor, a hot-swap control module, and a field effect transistor; The first end of the detection resistor is connected to the first end of the input capacitor; The first end and the second end of the hot-swap control module are respectively connected to both ends of the detection resistor; The drain of the field effect transistor is connected to the second end of the detection resistor, the gate of the field effect transistor is connected to the third end of the hot-swap control module, and the source of the field effect transistor is connected to the output end of the hot-swap circuit and the fourth end of the hot-swap control module.

8. A backplane frame product, characterized in that, The backplane-mounted frame product includes the board according to any one of claims 4-7.

9. The framed product with a backplane according to claim 8, wherein, The backplane-mounted frame product includes a backplane, a long wire, and a power supply module; The backplane includes a plurality of connectors, and the backplane is used to connect to the board through the connectors; The long wire is used to connect the backplane and the power supply module.

10. The backplane frame type product according to claim 9, characterized in that, The power supply module includes a DC power supply and a filter capacitor.

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