Alternating current and direct current power supply intelligent switching circuit and electronic equipment thereof

Abstract

The utility model provides an alternating current and direct current power supply intelligent switching circuit and electronic equipment thereof, and relates to the technical field of alternating current and direct current power supply switching. Comprising a control module, a direct-current power supply input module, an alternating-current power supply input module, a direct-current input current sampling circuit, a first voltage division circuit, a DCDC assembly, a direct-current output current sampling circuit, a second voltage division circuit, a mutual inductance circuit, an ACDC assembly and an alternating-current output current sampling circuit. The device monitors AC and DC power supplies in real time, can detect abnormal fluctuation, overvoltage, overcurrent, power-off tripping and the like of the power supplies in time, can intelligently switch the AC power supply or the standby DC power supply to supply power, uploads alarm information, stores data and does not lose the data and the like. And the DC power supply can be independently turned on to detect the battery conversion efficiency and prevent the battery from aging. And voltage data is detected to prevent battery power shortage. And the abnormal battery is reported, so that a manufacturer can maintain timely.

Description

Technical Field

[0001] The utility model relates to the technical field of AC / DC power switching, in particular to an AC / DC power intelligent switching circuit and electronic equipment thereof. Background Art

[0002] Current outdoor communication products, especially those used in unmanned environments such as tower IDUs, high-altitude FSUs, light pole gateways, power DTUs, and oil well gateways, typically rely on an uninterruptible power supply (UPS) to power these devices. Consequently, the devices have two power supply options: direct AC power and DC backup battery power. These devices require AC-to-DC and DC-to-DC power modules.

[0003] However, in remote areas, due to the poor stability of utility power, transmission and transformation lines are often affected by factors such as lightning strikes and surges, resulting in power surges or power outages. Therefore, it is particularly important to be able to promptly detect abnormal power fluctuations, overvoltage, overcurrent, and power outages, intelligently switch between AC power and DC backup power, report abnormalities, and save data. In addition, the stable DC backup battery in the UPS power system is a reliable guarantee for the entire power system. If there is an effective way to monitor battery status and determine battery aging and power module failure by judging conversion efficiency, equipment manufacturers can promptly repair the power system, replace and maintain batteries, and further ensure the stability of communication equipment.

[0004] Furthermore, if the backup DC battery is not used for a long period of time, it will become stagnant and age. Conversely, if the DC backup battery is used for power for a long period of time, it will be used too frequently and the number of charge and discharge cycles will be excessive, which will lead to performance degradation. Therefore, battery monitoring is particularly necessary.

[0005] Simply put, existing communication equipment suitable for remote areas has problems such as the inability to detect overvoltage and overcurrent, power outage alarms, power efficiency detection, power anomaly reporting, and battery conversion efficiency detection and battery maintenance reporting.

[0006] In view of this, this application is filed. Utility Model Content

[0007] The utility model provides an AC / DC power intelligent switching circuit and electronic equipment thereof, which can at least partially improve the above problems.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] An AC / DC power intelligent switching circuit includes: a control module, a DC power input module, an AC power input module, a DC input current sampling circuit, a first voltage divider circuit, a DCDC component, a DC output current sampling circuit, a second voltage divider circuit, a mutual inductance circuit, an ACDC component, and an AC output current sampling circuit;

[0010] The positive electrode of the DC power input module is connected to the first end of the DC input current sampling circuit, the second end of the DC input current sampling circuit is connected to the second interface of the control module, the third end of the DC input current sampling circuit is connected to the first interface of the control module via the first voltage divider circuit, the third end of the DC input current sampling circuit is connected to the DCDC component, the enable end of the DCDC component is connected to the first enable end of the control module, the output end of the DCDC component is connected to the fifth interface and the sixth interface of the control module respectively via the DC output current sampling circuit and the second voltage divider circuit, the neutral line and the live line of the AC power input module are both connected to the mutual induction circuit and the ACDC component, the voltage mutual induction output end and the current mutual induction output end of the mutual induction circuit are connected to the third interface and the fourth interface of the control module respectively, the enable end of the ACDC component is connected to the second enable end of the control module, and the output end of the ACDC component is connected to the seventh end of the control module via the AC output current sampling circuit;

[0011] The DC input current sampling circuit includes a first sampling resistor RC1 and a first differential amplifier U1. The negative pole of the DC power input module is grounded, and the positive pole of the DC power input module passes through the first sampling resistor RC1 and the U1 differential amplifier to convert the current signal into a voltage signal, which is then connected to the second interface ADC2 of the control module.

[0012] The present invention also provides an electronic device, comprising: a device body, and an AC / DC power intelligent switching circuit as described in any one of the above items, wherein the AC / DC power intelligent switching circuit is configured on the device body.

[0013] In summary, the AC / DC intelligent switching circuit can monitor both AC and DC power supplies in real time, promptly detecting abnormalities in power conversion efficiency, input power fluctuations, overvoltage, overcurrent, and power outages. It can then intelligently switch between AC power and backup DC power, while simultaneously uploading alarm information and saving data to prevent data loss. It can also independently activate the DC power supply, monitor battery conversion efficiency to prevent battery aging, detect voltage data to prevent battery depletion, and report battery anomalies to facilitate timely maintenance by the manufacturer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the AC / DC power intelligent switching circuit provided by an embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the overall flow of the AC / DC power intelligent switching circuit provided by an embodiment of the utility model;

[0016] Figure 3 This is a schematic diagram of the interruption process of the AC / DC power intelligent switching circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] refer to Figure 1 、 Figure 2 and Figure 3 As shown, the first embodiment of the present utility model discloses an AC / DC power intelligent switching circuit, which includes: a control module, a DC power input module, an AC power input module, a DC input current sampling circuit, a first voltage divider circuit, a DCDC component, a DC output current sampling circuit, a second voltage divider circuit, a mutual inductance circuit, an ACDC component, and an AC output current sampling circuit;

[0019] The positive electrode of the DC power input module is connected to the first end of the DC input current sampling circuit, the second end of the DC input current sampling circuit is connected to the second interface of the control module, the third end of the DC input current sampling circuit is connected to the first interface of the control module via the first voltage divider circuit, the third end of the DC input current sampling circuit is connected to the DCDC component, the enable end of the DCDC component is connected to the first enable end of the control module, the output end of the DCDC component is connected to the fifth interface and the sixth interface of the control module respectively via the DC output current sampling circuit and the second voltage divider circuit, the neutral line and the live line of the AC power input module are both connected to the mutual induction circuit and the ACDC component, the voltage mutual induction output end and the current mutual induction output end of the mutual induction circuit are connected to the third interface and the fourth interface of the control module respectively, the enable end of the ACDC component is connected to the second enable end of the control module, and the output end of the ACDC component is connected to the seventh end of the control module via the AC output current sampling circuit;

[0020] The DC input current sampling circuit includes a first sampling resistor RC1 and a first differential amplifier U1. The negative pole of the DC power input module is grounded, and the positive pole of the DC power input module passes through the first sampling resistor RC1 and the U1 differential amplifier to convert the current signal into a voltage signal, which is then connected to the second interface ADC2 of the control module.

[0021] Preferably, the DC power input module is a battery, and the first voltage divider circuit includes a first resistor R1 and a second resistor R2, wherein the positive electrode of the DC power input module is connected to the first interface ADC1 of the control module through the first resistor R1 and the second resistor R2.

[0022] Preferably, the DCDC component includes a DCDC power supply module and a first diode Q1, and the DC output current sampling circuit includes a second sampling resistor RC2 and a second differential amplifier U2, wherein the positive electrode of the DC power input module is connected to the DCDC power supply module, the enable pin of the DCDC power supply module is connected to the first enable terminal IO1 of the control module, and the output end of the DCDC power supply module is connected to the second sampling resistor RC2 through the first diode Q1, and is connected to the fifth interface ADC5 of the control module through the second differential amplifier U2.

[0023] Preferably, the second voltage divider circuit includes a fifth resistor R5 and a sixth resistor R6, and the output end of the DCDC power supply module is connected to the sixth interface ADC6 of the control module through the fifth resistor R5 and the sixth resistor R62, wherein the first diode Q1 is a Schottky diode.

[0024] Preferably, the mutual induction circuit includes a voltage transformer L1, a third resistor, a current transformer L2 and a fourth resistor R4, wherein the live wire L and the neutral wire N of the AC power input module are connected to the voltage transformer L1, the output end of the voltage transformer L1 is connected to the third interface ADC3 of the control module through the third resistor R3, the live wire L of the AC power input module is connected in series to the input end of the current transformer L2, and the output end of the current transformer L2 is connected to the fourth interface ADC4 of the control module through the fourth resistor R4.

[0025] Preferably, the ACDC component includes an ACDC power supply module and a second diode Q2, and the AC output current sampling circuit includes a third sampling resistor RC3 and a third differential amplifier U3, wherein the live wire L and the neutral wire N of the AC power input module are connected to the ACDC power supply module, and the enable pin of the ACDC power supply module is connected to the second enable terminal IO2 of the control module. The output end of the ACDC power supply module is connected to the third sampling resistor RC3 through the second diode Q2, and is connected to the seventh interface ADC7 of the control module through the third differential amplifier U3. The second diode Q2 is a Schottky diode.

[0026] Specifically, in this embodiment, the DC power supply part of the AC / DC power intelligent switching circuit is as follows: the positive line of the DC power input end passes through the sampling resistor RC1 and the first differential amplifier U1 differential amplifier to convert the current signal into a voltage signal and connect it to the ADC2 of the MCU; the positive line of the power supply passes through the voltage division of the first resistor R1 and the second resistor R2 and is connected to the ADC1 of the MCU; the DC power supply is then stepped down through the DCDC module to output the system power supply, and the enable pin EN of the DCDC module is connected to the IO1 of the MCU; the output of the DCDC module passes through the Q1 Schottky diode, is connected to the sampling resistor RC2, and is connected to the ADC5 of the MCU through the second differential amplifier U2 differential amplifier circuit; the output power continues to be connected to the fifth resistor R5 and the sixth resistor R6 for voltage division, and the voltage division output is connected to ADC6, and finally converged to the power output port.

[0027] The AC power supply part of the AC / DC power intelligent switching circuit is as follows: the neutral and live power supply L and N poles of the AC power supply are first connected to the voltage transformer L1, and the induced current of the rear stage of the voltage transformer L1 generates a sampling voltage through the third resistor R3 and is given to the ADC3 of the MCU; the L pole of the AC power supply is connected in series to the input end of the current transformer L2, and the induced current of the rear stage of the current transformer L2 is converted into a voltage signal through the fourth resistor R4 and is given to the ADC4 of the MCU; the neutral and live power supply L and N poles are converted into DC system power through the ACDC module, and the enable pin EN of the ACDC module is connected to IO2 of the MCU; the ACDC output is then connected to the sampling resistor RC3 through the Q2 Schottky diode, and the sampling ends of the sampling resistor RC3 are connected to the third differential amplifier U3, and the output end of the third differential amplifier U3 is connected to ADC7 of the MCU; finally, the output power is converged to the DC output port through the sampling resistor.

[0028] In this embodiment, the AC / DC intelligent switching circuit monitors both AC and DC power supplies in real time, promptly detecting abnormalities in power conversion efficiency, input power fluctuations, overvoltage, overcurrent, and power outages. It then intelligently switches between AC power and backup DC power, while simultaneously uploading alarm information and saving data to prevent data loss. It can also independently activate the DC power supply, monitor battery conversion efficiency to prevent battery aging, and detect voltage data to prevent battery depletion. Battery anomalies are reported to facilitate timely maintenance by the manufacturer.

[0029] See also Figure 2 and Figure 3 Specifically, in this embodiment, under normal circumstances, the ACDC power module and the DCDC power module are powered simultaneously; however, in the event of DC battery loss, DC overvoltage and overcurrent protection, and DC conversion efficiency below a threshold, the ACDC power module supplies power alone, and the DCDC power module is shut down. In the event that the DC power supply has not been used alone for a long time, AC overvoltage and overcurrent protection, AC conversion efficiency is below a threshold, and AC power is lost, the DCDC power module supplies power alone, and the ACDC power module is shut down. In addition, the control module reports an alarm when the following situations occur: 1. AC or DC power loss warning, and data is saved simultaneously; 2. AC or DC conversion efficiency is below a threshold, and a repair report is issued; 3. The battery is depleted for a long time, and a repair report is issued.

[0030] in, Figure 3 INT1_DC represents the first interrupt, which is triggered when the DC is overvoltage or overcurrent; INT2_AC represents the second interrupt, which is triggered when the AC is overvoltage or overcurrent; INT3_AC represents the third interrupt, which is triggered when the AC is powered off. Figure 2 and Figure 3 AC stands for ACDC power module, DC stands for DCDC power module, ADC1 is the DCDC power module input voltage, ADC2 is the DCDC power module input current, ADC3 is the ACDC power module input voltage, ADC4 is the ACDC power module input current, ADC5 is the DCDC power module output current, ADC6 is the combined output voltage, ADC7 is the ACDC power module output current, TIME1 is the time when DC is not used alone, Qdc is the DC power conversion efficiency = output power / input power = (ADC1*ADC2) / (ADC5*ADC6), and Qac is the AC power conversion efficiency = output power / input power = (ADC3*ADC4) / (ADC6*ADC7).

[0031] Simply put, the overall process of the AC / DC power intelligent switching circuit is as follows: First, start up, turn on the AC and DC, and set timer TIME1, interrupt 1, interrupt 2, and interrupt 3. Read the ADC value to determine whether the battery is low, that is, whether ADC1 is less than the set threshold (V); if so, activate an alarm and shut down the DC. If not, determine whether the DC efficiency is too low, that is, Qdc < threshold (%). Determine whether the DC has not been used alone for a long time, that is, TIME1 > threshold. If so, clear TIME1 and shut down the AC. If not, continue to determine whether the AC efficiency is too low, that is, Qac < threshold (%).

[0032] In summary, compared with the existing technology, the AC / DC power supply intelligent switching circuit has the following characteristics: 1. By collecting the AC / DC input and output voltage and current, the energy conversion efficiency of the AC or DC power supply is calculated; 2. The voltage and current data collected by the MCU in real time can be used to perform overvoltage and overcurrent detection and power failure warning, and intelligently switch the AC / DC power supply.

[0033] A second embodiment of the present invention provides an electronic device, comprising: a device body, and an AC / DC power intelligent switching circuit as described in any one of the above items, wherein the AC / DC power intelligent switching circuit is configured on the device body.

[0034] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An AC / DC power intelligent switching circuit, characterized in that: include: Control module, DC power input module, AC power input module, DC input current sampling circuit, first voltage divider circuit, DCDC component, DC output current sampling circuit, second voltage divider circuit, mutual inductance circuit, ACDC component, and AC output current sampling circuit; The positive electrode of the DC power input module is connected to the first end of the DC input current sampling circuit, the second end of the DC input current sampling circuit is connected to the second interface of the control module, the third end of the DC input current sampling circuit is connected to the first interface of the control module via the first voltage divider circuit, the third end of the DC input current sampling circuit is connected to the DCDC component, the enable end of the DCDC component is connected to the first enable end of the control module, the output end of the DCDC component is connected to the fifth interface and the sixth interface of the control module respectively via the DC output current sampling circuit and the second voltage divider circuit, the neutral line and the live line of the AC power input module are both connected to the mutual induction circuit and the ACDC component, the voltage mutual induction output end and the current mutual induction output end of the mutual induction circuit are connected to the third interface and the fourth interface of the control module respectively, the enable end of the ACDC component is connected to the second enable end of the control module, and the output end of the ACDC component is connected to the seventh end of the control module via the AC output current sampling circuit; The DC input current sampling circuit includes a first sampling resistor RC1 and a first differential amplifier U1. The negative pole of the DC power input module is grounded, and the positive pole of the DC power input module passes through the first sampling resistor RC1 and the U1 differential amplifier to convert the current signal into a voltage signal, which is then connected to the second interface ADC2 of the control module.

2. The AC / DC power intelligent switching circuit according to claim 1, characterized in that: The DC power input module is a battery, and the first voltage divider circuit includes a first resistor R1 and a second resistor R2. The positive electrode of the DC power input module is connected to the first interface ADC1 of the control module through the first resistor R1 and the second resistor R2.

3. The AC / DC power intelligent switching circuit according to claim 2, characterized in that: The DCDC component includes a DCDC power module and a first diode Q1. The DC output current sampling circuit includes a second sampling resistor RC2 and a second differential amplifier U2. The positive electrode of the DC power input module is connected to the DCDC power module, and the enable pin of the DCDC power module is connected to the first enable terminal IO1 of the control module. The output terminal of the DCDC power module is connected to the second sampling resistor RC2 through the first diode Q1, and is connected to the fifth interface ADC5 of the control module through the second differential amplifier U2.

4. The AC / DC power intelligent switching circuit according to claim 3, characterized in that: The second voltage divider circuit includes a fifth resistor R5 and a sixth resistor R6. The output end of the DCDC power supply module is connected to the sixth interface ADC6 of the control module through the fifth resistor R5 and the sixth resistor R62. The first diode Q1 is a Schottky diode.

5. The AC / DC power intelligent switching circuit according to claim 4, characterized in that: The mutual induction circuit includes a voltage transformer L1, a third resistor, a current transformer L2 and a fourth resistor R4, wherein the live wire L and the neutral wire N of the AC power input module are connected to the voltage transformer L1, the output end of the voltage transformer L1 is connected to the third interface ADC3 of the control module through the third resistor R3, the live wire L of the AC power input module is connected in series to the input end of the current transformer L2, and the output end of the current transformer L2 is connected to the fourth interface ADC4 of the control module through the fourth resistor R4.

6. The AC / DC power intelligent switching circuit according to claim 5, characterized in that: The ACDC component includes an ACDC power module and a second diode Q2. The AC output current sampling circuit includes a third sampling resistor RC3 and a third differential amplifier U3. The live wire L and the neutral wire N of the AC power input module are connected to the ACDC power module. The enable pin of the ACDC power module is connected to the second enable terminal IO2 of the control module. The output terminal of the ACDC power module is connected to the third sampling resistor RC3 through the second diode Q2, and is connected to the seventh interface ADC7 of the control module through the third differential amplifier U3. The second diode Q2 is a Schottky diode.

7. An electronic device, characterized in that: The device comprises a device body and an AC / DC power intelligent switching circuit according to any one of claims 1 to 6, wherein the AC / DC power intelligent switching circuit is configured on the device body.

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