Power supply circuit applied to 4G module and provided with standby battery

Abstract

The utility model provides a power supply circuit applied to a 4G module and provided with a standby battery, and belongs to the technical field of electronic circuits. The power supply circuit applied to the 4G module and provided with the standby battery comprises a power adapter, a first step-down circuit, an input control circuit, a booster circuit, a second step-down circuit, a filter circuit, a standby power charging control circuit, the standby battery, the 4G module and a CPU module. The power adapter is electrically connected with the input control circuit through the first step-down circuit, the first step-down circuit is further electrically connected with the standby power charging control circuit, the standby power charging control circuit is electrically connected with the standby battery, and the standby battery is electrically connected with the input control circuit to supply power to the booster circuit. And the second step-down circuit reduces the voltage of the booster circuit to a power supply voltage conforming to the 4G module and the CPU module. The utility model aims to solve the problems of stable power supply between the 4G module and the CPU and low utilization rate of the battery in the prior art.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic circuits, and in particular relates to a power supply circuit with a backup battery applied to a 4G module. Background Art

[0002] As key components for high-speed data transmission, 4G modules are widely used in various mobile devices and remote monitoring systems. However, the stable operation of these modules is highly dependent on a continuous and reliable power supply. In the event of unstable power supply or unexpected power outages, existing 4G modules may face the risk of data transmission interruption, communication quality degradation, and even device damage.

[0003] Currently, 4G modules are increasingly used in fire alarm systems, particularly wireless fire alarm products. However, most 4G modules rely on a single power supply, which clearly cannot meet practical needs. In 4G applications, especially those requiring battery backup, ensuring stable power supply to the 4G module and CPU, as well as battery utilization, becomes a challenge. Utility Model Content

[0004] The purpose of the present invention is to provide an input signal detection circuit with 4G wireless communication function, and to solve the problems of stable power supply of existing 4G modules and CPUs and low battery utilization.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A power supply circuit with a backup battery for a 4G module, used for powering the 4G module, is characterized in that it includes: a power adapter, a first step-down circuit, an input control circuit, a boost circuit, a second step-down circuit, a filter circuit, a backup power charging control circuit, a backup battery, a 4G module, and a CPU module; the power adapter is electrically connected to the input control circuit through the first step-down circuit, the first step-down circuit is also electrically connected to the backup power charging control circuit, the backup power charging control circuit is electrically connected to the backup battery, the backup battery supplies power to the boost circuit by being electrically connected to the input control circuit, and the second step-down circuit reduces the voltage of the boost circuit to a power supply voltage that meets the 4G module and the CPU module.

[0007] As a preferred solution of the present utility model, the first step-down circuit includes a chip U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, and an inductor L1. The pin LX of the chip U1 is connected in series with the inductor L1, the resistor R1, and the resistor R2 and then grounded. The inductor L1, the resistor R1, and the resistor R2 are connected in series and then connected in parallel with the voltage regulator diode ZD1. The pin COMP of the chip U1 is connected in series with the capacitor C3 and the resistor R4 and then grounded. The pin BS and the pin LX of the chip U1 are connected through the capacitor C4. The pin VIN of the chip U1 is connected to the positive pole of the power adapter. The pin VIN of the chip U1 is also grounded after being connected to the capacitor C1. The pin FSW of the chip U1 is grounded after being connected to the resistor R3. The pin SS of the chip U1 is grounded after being connected to the capacitor C2.

[0008] As a preferred solution of the present invention, the input control circuit is connected to the positive electrode of the backup battery through a diode VD5, and the input control circuit is also connected to the positive electrode of the output 5V power supply of the first step-down circuit through a diode VD6.

[0009] As a preferred solution of the present invention, the output voltage of the second step-down circuit is connected to the CPU module after being processed by the filter circuit. The second step-down circuit includes a chip U2, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R5, a resistor R6, a resistor R7, a resistor R8, and an inductor L2. The chip U2 is connected in series with capacitor C8 and resistor R6 in sequence and then grounded. The capacitor C8 and resistor R6 are connected in series and in parallel with resistor R7. The resistor R8 and capacitor C10 are also connected in series with resistor R7. The pin SW of the chip U2 is connected in series with inductor L2 and then outputs the voltage. A capacitor C9 is also connected between the pin SW and pin BS of the chip U2. The pin SS of the chip U2 is connected in series with capacitor C7 and then grounded. The pin EN of the chip U2 is connected to the positive pole of the input voltage through the resistor R5, and C6 is electrically connected between the positive pole of the input voltage and the ground.

[0010] As a preferred solution of the present invention, the boost circuit includes a chip U3, a resistor R9, a resistor R10, an inductor L3, a capacitor C11, and a capacitor C12. The pin OUT of the chip U3 is connected in series with the resistor R9 and the resistor R10 and then grounded. The resistor R9 and the resistor R10 are connected in series and then connected in parallel with the capacitor C12. The connection end of the resistor R9 and the resistor R10 is also connected to the pin FB of the chip U3. The positive pole of the input control circuit is electrically connected to the pins IN and INA of the chip U3. The positive pole of the input control circuit is also connected to the pin SW of the chip U3 through the electrical connection inductor L3.

[0011] As a preferred solution of the present invention, the filter circuit is composed of several capacitors, an inductor L4, and a diode VD1. Several of the capacitors are connected in parallel with each other, and the several parallel capacitors output voltage after being connected in series with the inductor L4 and the diode VD1.

[0012] As a preferred solution of the present invention, the CPU module communicates with the Internet of Things platform through a 4G module.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] By designing a power supply circuit with a backup battery for the 4G module, the power adapter is highly adaptable and can accommodate power supplies of various voltages. The backup battery has high utilization, with a minimum voltage of 3.0V, allowing a small backup battery to achieve a large capacity. The 4G module's power supply is highly stable and can be maintained at typical voltage values. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a module diagram of a power supply circuit with a backup battery for a 4G module according to the present invention;

[0017] Figure 2 This is a first step-down circuit diagram of a power supply circuit with a backup battery for a 4G module according to the present invention;

[0018] Figure 3 This is a second step-down circuit diagram of a power supply circuit with a backup battery for a 4G module according to the present invention;

[0019] Figure 4 This is a boost circuit diagram of a power supply circuit with a backup battery used in a 4G module of the present invention;

[0020] Figure 5 This is a filter circuit diagram of a power supply circuit with a backup battery for a 4G module in the present invention;

[0021] Figure 6 This is an input control circuit diagram of a power supply circuit with a backup battery applied to a 4G module of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0023] Example

[0024] See also Figure 1 , the utility model provides the following technical solutions:

[0025] A power supply circuit with a backup battery for a 4G module, used for powering the 4G module, includes: a power adapter, a first step-down circuit, an input control circuit, a boost circuit, a second step-down circuit, a filter circuit, a backup power charging control circuit, a backup battery, a 4G module, and a CPU module; the power adapter is electrically connected to the input control circuit through the first step-down circuit, and the device is powered by the power adapter. The device is suitable for adapters with multiple voltages of 9V-36V. The first step-down circuit is also electrically connected to the backup power charging control circuit. The first step-down circuit charges the subsequent boost circuit and the backup battery after stepping down the input voltage. The backup battery is electrically connected to the input control circuit to power the boost circuit. The second step-down circuit reduces the voltage of the boost circuit to a power supply voltage that meets the 4G module and CPU module. The power supply range of the 4G module is 3.3V-4.3V, and the typical value is 3.8V. In order to ensure the stability of the module power supply and the utilization rate of the battery, a power supply scheme of first boosting and then reducing the voltage is adopted.

[0026] Specifically, the first step-down circuit includes chip U1, resistor R1, resistor R2, resistor R3, resistor R4, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, and inductor L1. The first step-down circuit reduces the voltage of the power adapter to the rechargeable voltage of the backup battery. When the output voltage of the first step-down circuit is higher than the maximum voltage of the backup battery, the unidirectional conductivity of the diode is used to prevent the backup battery from overcharging. When the power adapter is powered, the main power supply is selected. When the main power fails, the backup battery is powered. Pin LX of chip U1 is connected in series with inductor L1, resistor R1, and resistor R2, and then to ground. These connections are then connected in parallel with Zener diode ZD1. Pin COMP of chip U1 is connected in series with capacitor C3 and resistor R4, and then to ground. Pins BS and LX of chip U1 are connected via capacitor C4. Pin VIN of chip U1 is connected to the positive terminal of the power adapter and is also connected to ground via capacitor C1. Pin FSW of chip U1 is connected to resistor R3 and then to ground. Pin SS of chip U1 is connected to capacitor C2 and then to ground. As capacitor C2 charges, the voltage on pin SS of chip U1 increases. The output voltage rise time tracks the voltage on pin SS of chip U1. The slow rise of the output voltage prevents inrush current.

[0027] Specifically, the input control circuit is connected to the positive electrode of the backup battery through diode VD5. The input control circuit is also connected to the positive electrode of the output 5V power supply of the first step-down circuit through diode VD6. The input control circuit is responsible for monitoring and controlling the output of the power adapter to ensure stable power supply. The output voltage of the second step-down circuit is processed by the filter circuit and then connected to the CPU module to ensure that the CPU can operate in the best state and improve the stability, reliability and efficiency of the entire system. The second step-down circuit includes chip U2, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, resistor R5, resistor R6, resistor R7, resistor R8, and inductor L2. Chip U2 is connected in series with capacitor C8 and resistor R6 and then grounded. Capacitor C8 and resistor R6 are connected in series and in parallel with resistor R7. Resistor R8 and capacitor C10 are also connected in series with resistor R7. Pin SW of chip U2 is connected in series with inductor L2 and then outputs voltage. Capacitor C9 is also connected between pin SW and pin BS of chip U2. Pin SS of chip U2 is connected in series with capacitor C7 and then grounded. Pin EN of chip U2 is connected to the positive pole of the input voltage through resistor R5, and C6 is electrically connected between the positive pole of the input voltage and ground.

[0028] Specifically, the boost circuit includes chip U3, resistor R9, resistor R10, inductor L3, capacitor C11, and capacitor C12. Pin OUT of chip U3 is connected in series with resistor R9 and resistor R10 and then grounded. Resistors R9 and R10 are connected in series and then connected in parallel with capacitor C12. The connection end of resistor R9 and resistor R10 is also connected to pin FB of chip U3. The positive pole of the input control circuit is electrically connected to pins IN and INA of chip U3. The positive pole of the input control circuit is also connected to pin SW of chip U3 through electrical connection to inductor L3. The filter circuit is composed of several capacitors, inductor L4, and diode VD1. Several capacitors are connected in parallel with each other. Several capacitors connected in parallel output voltage after being connected in series with inductor L4 and diode VD1. The CPU module communicates with the Internet of Things platform through the 4G module.

[0029] In specific applications, when the circuit is operating, the input voltage of the 9V-36V power adapter is stepped down to 4.75V by the first step-down circuit, serving as a charging source for the backup battery. This voltage is then supplied to the boost circuit via the input control circuit. When the power adapter's main power supply is disconnected, the backup battery supplies power to the boost circuit. When the main power supply is restored, the main battery provides power, achieving seamless switching between primary and backup power. The output voltage of the boost circuit is stepped down to 3.8V by the second step-down circuit, providing power to the 4G module. After passing through the filtering circuit, it is supplied to the CPU module.

[0030] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A power supply circuit with a backup battery for a 4G module, used for powering the 4G module, characterized in that: include: A power adapter, a first step-down circuit, an input control circuit, a boost circuit, a second step-down circuit, a filter circuit, a backup power charging control circuit, a backup battery, a 4G module, and a CPU module; the power adapter is electrically connected to the input control circuit through the first step-down circuit, the first step-down circuit is also electrically connected to the backup power charging control circuit, the backup power charging control circuit is electrically connected to the backup battery, the backup battery supplies power to the boost circuit by being electrically connected to the input control circuit, and the second step-down circuit reduces the voltage of the boost circuit to a power supply voltage that meets the 4G module and the CPU module.

2. The power supply circuit with a backup battery for a 4G module according to claim 1, characterized in that: The first step-down circuit includes a chip U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, and an inductor L1. The pin LX of the chip U1 is connected in series with the inductor L1, the resistor R1, and the resistor R2 and then grounded. The inductor L1, the resistor R1, and the resistor R2 are connected in series and then connected in parallel with the voltage regulator diode ZD1. The pin COMP of the chip U1 is connected in series with the capacitor C3 and the resistor R4 and then grounded. The pin BS and the pin LX of the chip U1 are connected via the capacitor C4. The pin VIN of the chip U1 is connected to the positive pole of the power adapter. The pin VIN of the chip U1 is also grounded via the capacitor C1. The pin FSW of the chip U1 is grounded via the resistor R3. The pin SS of the chip U1 is grounded via the capacitor C2.

3. The power supply circuit with a backup battery for a 4G module according to claim 2, characterized in that: The input control circuit is connected to the positive electrode of the backup battery through a diode VD5, and is also connected to the positive electrode of the output 5V power supply of the first step-down circuit through a diode VD6.

4. The power supply circuit with a backup battery for a 4G module according to claim 3, characterized in that: The output voltage of the second step-down circuit is processed by the filter circuit and then connected to the CPU module. The second step-down circuit includes a chip U2, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R5, a resistor R6, a resistor R7, a resistor R8, and an inductor L2. The chip U2 is connected in series with the capacitor C8 and the resistor R6 in sequence and then grounded. The capacitor C8 and the resistor R6 are connected in series and in parallel with the resistor R7. The resistor R8 and the capacitor C10 are also connected in series with the resistor R7. The pin SW of the chip U2 is connected in series with the inductor L2 and then outputs the voltage. A capacitor C9 is also connected between the pin SW and the pin BS of the chip U2. The pin SS of the chip U2 is connected in series with the capacitor C7 and then grounded. The pin EN of the chip U2 is connected to the positive electrode of the input voltage through the resistor R5, and C6 is electrically connected between the positive electrode of the input voltage and the ground.

5. The power supply circuit with a backup battery for a 4G module according to claim 4, characterized in that: The boost circuit includes a chip U3, a resistor R9, a resistor R10, an inductor L3, a capacitor C11, and a capacitor C12. The pin OUT of the chip U3 is connected in series with the resistor R9 and the resistor R10 and then grounded. The resistor R9 and the resistor R10 are connected in series and then connected in parallel with the capacitor C12. The connection end of the resistor R9 and the resistor R10 is also connected to the pin FB of the chip U3. The positive pole of the input control circuit is electrically connected to the pins IN and INA of the chip U3. The positive pole of the input control circuit is also connected to the pin SW of the chip U3 through the electrical connection inductor L3.

6. The power supply circuit with a backup battery for a 4G module according to claim 5, characterized in that: The filter circuit is composed of a plurality of capacitors, an inductor L4, and a diode VD1. The plurality of capacitors are connected in parallel with each other. The plurality of capacitors connected in parallel are connected in series with the inductor L4 and the diode VD1 in sequence to output a voltage.

7. The power supply circuit with a backup battery for a 4G module according to claim 6, characterized in that: The CPU module communicates with the Internet of Things platform through the 4G module.

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