Power supply equalization circuit for communication module

Abstract

The utility model discloses a power supply equalization circuit for a communication module, and relates to the field of power supply of communication modules. The device comprises a conversion module. The standby power pack comprises a power module and a plurality of farad capacitors which are sequentially connected in series; the power supply module and the conversion module are connected to an external power supply; the conversion module is used for converting an external power supply into a voltage with a preset amplitude and inputting the voltage into the communication module; the power supply module is used for outputting a stable constant-current power supply and charging each farad capacitor with the constant-current power supply during the input period of an external power supply; the Farad capacitors are further used for providing a standby power supply for the communication module through the power supply module and the conversion module in sequence when the external power supply is cut off, the communication function is safely kept within at least a certain period of time after power failure through the Farad capacitors which are connected in series in sequence, key information can be ensured to be uploaded to a server, and the service life of the server is prolonged. And data loss is effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of power supply for communication modules, and more particularly to a power supply balancing circuit for communication modules. Background Technology

[0002] There are two main challenges in the power supply of existing 4G communication circuit boards. First, in the event of a sudden power outage, it is necessary to ensure that the equipment can be safely powered off or at least maintain communication for a certain period of time after the power outage in order to upload important data to the server and prevent information loss. Second, because the parameters of supercapacitors cannot be completely consistent, uneven voltage distribution can easily occur when they are used in series. This can cause some capacitors to bear excessively high voltage, which not only affects their output performance but also shortens their service life and may even cause failure. Utility Model Content

[0003] To ensure continued power supply to the 4G communication circuit board (i.e., the communication module) during sudden power outages, this invention proposes a power supply balancing circuit for the communication module, comprising:

[0004] Conversion module;

[0005] The backup power supply consists of a power module and multiple supercapacitors connected in series.

[0006] Both the power module and the conversion module are connected to an external power source.

[0007] The conversion module is used to convert the external power supply into a voltage of a preset amplitude and input it into the communication module;

[0008] The power module is used to output a stable constant current power supply and to charge each supercapacitor with the constant current power supply during external power input.

[0009] The supercapacitor is also used to provide backup power to the communication module through the power module and the conversion module in sequence when the external power supply is disconnected.

[0010] Furthermore, the backup power supply group also includes an overcharge protection module corresponding to each supercapacitor; the overcharge protection module is used to release excess charging current after the supercapacitor is fully charged.

[0011] Furthermore, the conversion module specifically includes:

[0012] The DC-DC converter module is used to convert external power into a DC voltage of preset amplitude and input it to the level conversion module;

[0013] The level conversion module is used to convert DC voltage of preset amplitude and input the converted voltage into the communication module.

[0014] Furthermore, the overcharge protection module includes: a second resistor R2, a fourth resistor R4, a first MOSFET Q1, a sixth resistor R6, and a seventh resistor R7;

[0015] One end of the second resistor R2, one end of the fourth resistor R4, and the source of the first MOSFET Q1 are simultaneously connected to the positive terminal of the corresponding supercapacitor of the overcharge protection module; the other end of the second resistor R2 is simultaneously connected to the gate of the first MOSFET Q1 and the second pin of the voltage reference component TL432; the other end of the fourth resistor R4 is simultaneously connected to the first pin of the voltage reference component TL432 and one end of the tenth resistor R10; the sixth resistor R6 and the seventh resistor R7 are connected in parallel, with one parallel end connected to the drain of the first MOSFET Q1; the other end of the tenth resistor R10 is sequentially connected to the third pin of the voltage reference component TL432, the other parallel end of the sixth resistor R6 and the seventh resistor R7, and then connected to the negative terminal of the corresponding supercapacitor.

[0016] Furthermore, the power module includes:

[0017] Power supply chip, first resistor R1 and first diode D1;

[0018] The Adjust pin of the power chip is connected in sequence to one end of the first resistor R1, the positive terminal of the first diode D1, and then to the positive terminal of the first series-connected supercapacitor.

[0019] The Vin pin of the power chip is connected to the negative terminal of the first diode D1 and the external power supply in sequence, and then connected to the DC-DC conversion module; the Vout pin of the power chip is connected to the other end of the first resistor R1.

[0020] Furthermore, the DC-DC conversion module includes: a voltage regulator chip U3; the fifth pin of the voltage regulator chip U3 is connected to an external power supply and then connected to the Vin pin of the power supply chip in the power supply module; the sixth pin of the voltage regulator chip U3 is connected to a level conversion module.

[0021] Furthermore, the level conversion module includes:

[0022] The converter chip U2; the fourteenth pin of the converter chip U2 is connected to the sixth pin of the voltage regulator chip U3; the first pin of the converter chip U2 inputs the converted voltage to the communication module.

[0023] Furthermore, the fourth resistor R4 in the overcharge protection module is used to limit the reference voltage between the Adjust pin and the Vout pin of the power chip in the power module; the power chip controls the current output by the first resistor R1 in the power module to be a constant current power supply based on the reference voltage.

[0024] Furthermore, in the overcharge protection module, the voltage reference component TL432 and the first MOSFET Q1 form an overcharge protection switch; when the first pin of the voltage reference component TL432 reaches the threshold value, the second pin of the voltage reference component TL432 generates a fixed voltage. When the source voltage of the first MOSFET Q1, i.e., the voltage of the corresponding supercapacitor, is greater than the fixed voltage, the channel from the source to the drain of the first MOSFET Q1 is turned on, and the excess charging current is released through this channel to prevent overcharging.

[0025] Furthermore, the fixed voltage generated by the second pin of the voltage reference component TL432 is less than the threshold value corresponding to the first pin of the voltage reference component TL432.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] (1) This utility model includes a conversion module; a backup power supply group, which includes a power supply module and multiple supercapacitors connected in series; both the power supply module and the conversion module are connected to an external power supply; the conversion module is used to convert the external power supply into a voltage of a preset amplitude and input it into the communication module; the power supply module is used to output a stable constant current power supply and charge each supercapacitor with the constant current power supply during the external power supply input period; the supercapacitors are also used to provide backup power to the communication module in sequence through the power supply module and the conversion module when the external power supply is disconnected. This utility model safely realizes the communication function for at least a certain period of time after power failure through multiple supercapacitors connected in series, ensuring that key information can be uploaded to the server and effectively preventing data loss.

[0028] (2) In this utility model, the backup power supply group also includes an overcharge protection module corresponding to each supercapacitor; the overcharge protection module is used to release excess charging current after the supercapacitor is fully charged; ensuring that the supercapacitor will not be damaged due to overcharging;

[0029] (3) In this utility model, the fourth resistor R4 in the overcharge protection module is used to limit the reference voltage between the Adjust pin and the Vout pin of the power chip in the power module; the power chip controls the current output by the first resistor R1 in the power module to be a constant current power supply based on the reference voltage, which solves the problem that uneven voltage distribution is likely to occur when the parameters of the farad capacitors are not completely consistent and they are used in series. Attached Figure Description

[0030] Figure 1 This is a power supply balancing circuit diagram for a communication module;

[0031] Figure 2 The circuit diagram for the overcharge protection module in the power supply balancing circuit;

[0032] Figure 3 The circuit diagram of the DC-DC conversion module and the power supply module in the power supply balancing circuit;

[0033] Figure 4 This is the circuit diagram for the communication module;

[0034] Figure 5 This is a diagram of a level conversion module. Detailed Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0036] To ensure continued power supply to the 4G communication circuit board (i.e., the communication module) in the event of a sudden power outage, such as... Figure 1 As shown, this utility model proposes a power supply balancing circuit for a communication module, comprising:

[0037] Conversion module;

[0038] The backup power supply consists of a power module and multiple supercapacitors connected in series.

[0039] Both the power module and the conversion module are connected to an external power source.

[0040] The conversion module is used to convert the external power supply into a voltage of a preset amplitude and input it into the communication module;

[0041] The conversion module specifically includes:

[0042] The DC-DC converter module is used to convert external power into a DC voltage of preset amplitude and input it to the level conversion module;

[0043] The level conversion module is used to convert DC voltage of preset amplitude (that is, to convert DC voltage of preset amplitude into voltage or level information usable by the communication module) and input the converted voltage into the communication module.

[0044] The power module is used to output a stable constant current power supply and to charge each supercapacitor with the constant current power supply during external power input; the backup power group also includes an overcharge protection module corresponding to each supercapacitor; the overcharge protection module is used to release excess charging current after the supercapacitor is fully charged.

[0045] like Figure 2 As shown, the overcharge protection module includes: a second resistor R2, a fourth resistor R4, a first MOSFET Q1, a sixth resistor R6, and a seventh resistor R7;

[0046] One end of the second resistor R2, one end of the fourth resistor R4 and the source electrode of the first MOS transistor Q1 are simultaneously connected to the positive electrode of the corresponding farad capacitor of the overcharge protection module; the other end of the second resistor R2 is simultaneously connected to the gate electrode of the first MOS transistor Q1 and the second pin of the voltage reference component TL432; the other end of the fourth resistor R4 is simultaneously connected to the first pin of the voltage reference component TL432 and one end of the tenth resistor R10; the sixth resistor R6 and the seventh resistor R7 are connected in parallel, and one parallel connection end is connected to the drain electrode of the first MOS transistor Q1; after the other end of the tenth resistor R10 is sequentially connected to the third pin of the voltage reference component TL432 and the other parallel connection end of the sixth resistor R6 and the seventh resistor R7, it is connected to the negative electrode end of the corresponding farad capacitor.

[0047] In the overcharge protection module, the voltage reference component TL432 and the first MOS transistor Q1 form an overcharge protection switch; when the voltage of the first pin of the voltage reference component TL432 reaches the threshold value, a fixed voltage is generated at the second pin of the voltage reference component TL432. When the source electrode voltage of the first MOS transistor Q1, that is, the voltage of the corresponding farad capacitor, is greater than the fixed voltage, the channel from the source electrode to the drain electrode of the first MOS transistor Q1 is turned on, and the excess charging current is released through this channel to prevent overcharging.

[0048] The fixed voltage generated at the second pin of the voltage reference component TL432 is less than the threshold value corresponding to the first pin of the voltage reference component TL432.

[0049] Specifically, as Figure 1 shown, TL432 and Q1 form a switch here, whose function is to prevent the battery from overcharging. The rated voltage of the farad capacitor used in this embodiment is 2.7V and the capacitance is 5F. When the voltage of the first pin (reference pin) of TL432 reaches 2.5V, a fixed voltage (denoted as VG) will be generated at the second pin (cathode pin) of TL432, and this voltage is less than 2.5V. The source electrode voltage (VS) of Q1 is equal to the voltage of the farad capacitor C1, that is, 2.7V. At this time, since VG < VS, it meets the conduction condition of the PMOS transistor. After the PMOS transistor is turned on (the channel from the S pole to the D pole is turned on), the excess current will be discarded, thereby preventing the capacitor from being damaged due to overcharging.

[0050] The fourth resistor R4 in the overcharge protection module is used to limit the reference voltage between the Adjust pin and the Vout pin of the power supply chip in the power supply module; the power supply chip controls the current output by the first resistor R1 in the power supply module to be a constant current power supply based on this reference voltage, thereby solving the problem that when farad capacitors (supercapacitors) are used in series, it is easy to occur the problem of uneven voltage distribution because their parameters cannot be completely the same.

[0051] Specifically, on the power chip side, it's a constant current output; the voltage between Vout and Adjust remains essentially constant at 1.25V. Therefore, the current through resistor R1 is constant. Assuming the resistance of R4 is 10Ω, the charging current for the capacitor is 125mA (i.e., 1.25V / 10Ω = 125mA). The current flowing out of Adjust is 50μA, which can be ignored.

[0052] During charging, C1, C2, and the subsequent series-connected supercapacitors (each with parameters of 2.7V and 5F) all have the same charging current, 125mA. Once fully charged, the voltage between the terminals of each supercapacitor is 2.7V. If 10 supercapacitors are connected in series, the final output voltage is 27V.

[0053] When power is off, the supercapacitor begins to discharge. For example, the discharge process of capacitor C1 is as follows: current flows from the positive terminal of C1, through R4, R10, Q1 (PMOS transistor), R6, and R7, and finally returns to the negative terminal of capacitor C1. This orderly flow of current allows the supercapacitor to discharge for a longer period of time.

[0054] like Figure 3 As shown, the power module includes:

[0055] Power supply chip, first resistor R1 and first diode D1;

[0056] The Adjust pin of the power chip is connected in sequence to one end of the first resistor R1, the positive terminal of the first diode D1, and then to the positive terminal of the first series-connected supercapacitor.

[0057] The Vin pin of the power chip is connected to the negative terminal of the first diode D1 and the external power supply in sequence, and then connected to the DC-DC conversion module; the Vout pin of the power chip is connected to the other end of the first resistor R1.

[0058] like Figure 3 As shown, the DC-DC conversion module includes: a voltage regulator chip U3; the fifth pin of the voltage regulator chip U3 is connected to an external power supply and then connected to the Vin pin of the power supply chip in the power supply module; the sixth pin of the voltage regulator chip U3 is connected to a level conversion module.

[0059] like Figure 5 As shown, the level conversion module includes:

[0060] Conversion chip U2; the fourteenth pin of conversion chip U2 is connected to the sixth pin of voltage regulator chip U3; the first pin of conversion chip U2 is connected to... Figure 4The communication module shown inputs the converted voltage (specifically, the first pin of the conversion chip U2 is connected to the VDD_EXT pin of the first chip U1 of the communication module).

[0061] The supercapacitor is also used to provide backup power to the communication module through the power module and the conversion module in sequence when the external power supply is disconnected.

[0062] like Figure 1 As shown, this embodiment uses two supercapacitors connected in series as an example:

[0063] Two supercapacitors connected in series can be considered as a temporary power storage device, i.e., a backup power supply. In the circuit, VCC24 represents the external power source. When VCC24 is present, it not only charges the supercapacitors but also powers the DC-DC converter module RY8411. RY8411 converts the external power source into a DC voltage of a preset amplitude and transmits it to the level conversion module TXB0104. TXB0104 converts the DC voltage to the preset amplitude and inputs the converted voltage to the communication module to ensure its normal operation.

[0064] When the external power supply VCC24 is disconnected, the two series-connected supercapacitors will begin to act as a backup power source, providing power to the RY8411 through diode D1 to ensure the continuous operation of the entire circuit. The presence of D1 ensures that the current can only flow in one direction, preventing current from flowing back to the supercapacitors and also preventing current crosstalk between the supercapacitors.

[0065] In this configuration, the capacitor is charging when VCC24 is powered on; when VCC24 is disconnected, the capacitor acts as a backup power source to continue powering the communication module until its internally stored charge is depleted. This design ensures that the communication module can continue to operate in the event of a sudden power outage, guaranteeing the continuity of data transmission.

[0066] Additionally, it should be noted that in this embodiment, the power balancing circuit and the communication module are integrated on a single circuit board, which is plugged into the PCB board. This plug-in method simplifies the maintenance process and improves production efficiency.

[0067] This invention includes a conversion module and a backup power supply group, which includes a power module and multiple supercapacitors connected in series. Both the power module and the conversion module are connected to an external power source. The conversion module converts the external power source into a voltage of a preset amplitude and inputs it into the communication module. The power module outputs a stable constant current power supply and charges each supercapacitor with this constant current power supply during the external power input period. The supercapacitors also provide backup power to the communication module in sequence through the power module and the conversion module when the external power source is disconnected. This invention, through multiple supercapacitors connected in series, safely achieves communication functionality for at least a certain period of time after a power outage, ensuring that critical information can be uploaded to the server and effectively preventing data loss.

[0068] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0069] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A power supply balancing circuit for a communication module, characterized in that, include: Conversion module; The backup power supply consists of a power module and multiple supercapacitors connected in series. Both the power module and the conversion module are connected to an external power source. The conversion module is used to convert the external power supply into a voltage of a preset amplitude and input it into the communication module; The power module is used to output a stable constant current power supply and to charge each supercapacitor with the constant current power supply during external power input. The supercapacitor is also used to provide backup power to the communication module through the power module and the conversion module in sequence when the external power supply is disconnected.

2. The power supply balancing circuit for a communication module according to claim 1, characterized in that, The backup power supply also includes an overcharge protection module corresponding to each supercapacitor; the overcharge protection module is used to release excess charging current after the supercapacitor is fully charged.

3. The power supply balancing circuit for a communication module according to claim 2, characterized in that, The conversion module specifically includes: The DC-DC converter module is used to convert external power into a DC voltage of preset amplitude and input it to the level conversion module; The level conversion module is used to convert DC voltage of preset amplitude and input the converted voltage into the communication module.

4. The power supply balancing circuit for a communication module according to claim 3, characterized in that, The overcharge protection module includes: a second resistor R2, a fourth resistor R4, a first MOSFET Q1, a sixth resistor R6, and a seventh resistor R7; One end of the second resistor R2, one end of the fourth resistor R4, and the source of the first MOSFET Q1 are simultaneously connected to the positive terminal of the corresponding supercapacitor of the overcharge protection module; the other end of the second resistor R2 is simultaneously connected to the gate of the first MOSFET Q1 and the second pin of the voltage reference component TL432; the other end of the fourth resistor R4 is simultaneously connected to the first pin of the voltage reference component TL432 and one end of the tenth resistor R10; the sixth resistor R6 and the seventh resistor R7 are connected in parallel, with one parallel end connected to the drain of the first MOSFET Q1; the other end of the tenth resistor R10 is sequentially connected to the third pin of the voltage reference component TL432, the other parallel end of the sixth resistor R6 and the seventh resistor R7, and then connected to the negative terminal of the corresponding supercapacitor.

5. A power supply balancing circuit for a communication module according to claim 4, characterized in that, The power module includes: Power supply chip, first resistor R1 and first diode D1; The Adjust pin of the power chip is connected in sequence to one end of the first resistor R1, the positive terminal of the first diode D1, and then to the positive terminal of the first series-connected supercapacitor. The Vin pin of the power chip is connected to the negative terminal of the first diode D1 and the external power supply in sequence, and then connected to the DC-DC conversion module; the Vout pin of the power chip is connected to the other end of the first resistor R1.

6. A power supply balancing circuit for a communication module according to claim 5, characterized in that, The DC-DC conversion module includes: a voltage regulator chip U3; the fifth pin of the voltage regulator chip U3 is connected to an external power supply and then connected to the Vin pin of the power supply chip in the power supply module; the sixth pin of the voltage regulator chip U3 is connected to a level conversion module.

7. A power supply balancing circuit for a communication module according to claim 6, characterized in that, The level conversion module includes: The converter chip U2; the fourteenth pin of the converter chip U2 is connected to the sixth pin of the voltage regulator chip U3; the first pin of the converter chip U2 inputs the converted voltage to the communication module.

8. A power supply balancing circuit for a communication module according to claim 7, characterized in that, The fourth resistor R4 in the overcharge protection module is used to limit the reference voltage between the Adjust pin and the Vout pin of the power chip in the power module; the power chip controls the current output by the first resistor R1 in the power module to be a constant current power supply based on the reference voltage.

9. A power supply balancing circuit for a communication module according to claim 8, characterized in that, In the overcharge protection module, the voltage reference component TL432 and the first MOSFET Q1 form an overcharge protection switch. When the first pin of the voltage reference component TL432 reaches the threshold value, the second pin of the voltage reference component TL432 generates a fixed voltage. When the source voltage of the first MOSFET Q1, i.e., the voltage of the corresponding supercapacitor, is greater than the fixed voltage, the channel from the source to the drain of the first MOSFET Q1 is turned on, and the excess charging current is released through this channel to prevent overcharging.

10. A power supply balancing circuit for a communication module according to claim 9, characterized in that, The fixed voltage generated by the second pin of the voltage reference component TL432 is less than the threshold value corresponding to the first pin of the voltage reference component TL432.

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