Multi-path power supply standby power logic circuit for novel Internet of Things meter

Abstract

The super capacitor charging module in the multi-path power supply standby power logic circuit for the novel Internet of Things meter comprises a resistor module, a diode D1 and a capacitor C1, wherein the resistor module, the diode D1 and the capacitor C1 are connected in series and are formed by connecting resistors R1 and R2 in parallel; the input ends of the resistors R1 and R2 which are connected in parallel are connected with + 5.2 V; one end of the capacitor C1 is grounded, and the other end is respectively connected with the diodes D1 and D2; + 5.2 V is respectively connected with the clock battery power supply AVBAT network and the VIN end of the voltage stabilizer U1 through a diode D3, and the output end of the diode D3 is also grounded through a capacitor C6; one path of network battery current ABATT is grounded through a capacitor C2 and a resistor R4 which are connected in parallel, and the other path of network battery current ABATT is connected with a resistor R3; the output end of the resistor R3 is respectively connected with diodes D4 and D6 and a resistor R5; the output end of the diode D4 is connected to the output end of the diode D3; the resistor R5 is connected with a power supply E1, and the power supply E1 is connected with a capacitor C3 in parallel; the output end of the diode D6 is connected with the output end of a diode D5; the structure is compact and use is convenient.

Description

Technical Field

[0001] The utility model relates to a multi - path power supply and backup power logic circuit for a new type of Internet of Things meter. Background Art

[0002] Due to the popularization and implementation of the OIML R46 - 1 / -2 international standard in China and the corresponding revisions of the GB / T 17215.211, GB / T17215.321, and JJF 1245 series of standards, the design of intelligent electricity meters needs to meet new technical requirements. At the same time, combined with the long - term operation of hundreds of millions of electricity meters, on - site application experience over the years, and new demands, the State Grid has issued the new 2020 standard for electricity meters, which standardizes and unifies the technical requirements and test items for the specifications, applicable environments, mechanical properties, electrical properties, anti - interference, and reliability of intelligent electricity meters, and standardizes the inspection rules and operation quality management requirements for electricity meters. Limited by the space structure, cost requirements, and complex power supply and backup power logic, the development of a multi - path power supply and backup power logic circuit applicable to a new type of Internet of Things meter is particularly important.

[0003] The applicant found through analyzing the power supply and backup power requirements of Internet of Things meters that due to the particularity of their functions, there are quite a few difficulties in the logic design of the power supply system of Internet of Things meters. It is necessary to integrate energy storage and power supply devices such as DC - DC, supercapacitors, and lithium batteries, and there is also a relatively complex consumption logic after power failure. In the initial stage of power - on, a large supply current is required; the applicant found that the SOC needs three - path power supply, including two paths of digital power and analog power, and one path of clock power supply. The basic logic integration is as follows: when power - on, the power supply is used, and energy storage devices are not used. The supercapacitor is charged within 10 minutes. After power failure, the supercapacitor is preferentially used for power supply; in the case of no battery, after the supercapacitor satisfies the power - off information processing for 50s, the supercapacitor only supplies power to the clock and ensures that the clock works for more than 48 hours without entering the low - power mode. In the case of having a battery after power failure, after the supercapacitor is discharged, the battery is used to supply the low - power mode and the clock.

[0004] In view of the above - listed technical difficulties, the present application provides a multi - path power supply and backup power logic circuit applicable to a new type of Internet of Things meter. Using discrete devices to build it avoids the high cost of using a power management chip, has low power consumption of the circuit itself, stable functions, and can adapt to a variety of new types of Internet of Things meters by adjusting corresponding parameters. Summary of the Utility Model

[0005] Generally speaking, the technical problem to be solved by the utility model is to provide a multi - path power supply and backup power logic circuit for a new type of Internet of Things meter, aiming to solve the complex power supply and backup power logic born due to the performance and function requirements of Internet of Things meters.

[0006] To solve the above problems, the technical solutions adopted by the utility model are as follows:

[0007] A multi - power - supply backup power logic circuit for a new - type Internet of Things meter, including a supercapacitor charging module and a voltage regulator U1;

[0008] The supercapacitor charging module includes a resistor module in series formed by resistors R1 and R2 in parallel, a diode D1, and a capacitor C1;

[0009] The input ends of the parallel resistors R1 and R2 are connected to +5.2V;

[0010] One end of the capacitor C1 is grounded, and the other end is respectively connected to diodes D1 and D2;

[0011] +5.2V is respectively connected to the clock battery - powered AVBAT network and the VIN terminal of the voltage regulator U1 through a diode D3,

[0012] The output end of the diode D3 is also grounded through a capacitor C6;

[0013] The network battery current ABATT is grounded through a parallel combination of a capacitor C2 and a resistor R4 in one path, and connected to a resistor R3 in the other path;

[0014] The output end of the resistor R3 is respectively connected to diodes D4, D6, and a resistor R5;

[0015] The output end of the diode D4 is connected to the output end of the diode D3;

[0016] The resistor R5 is connected to a power supply E1, and a capacitor C3 is connected in parallel with the power supply E1;

[0017] The output end of the diode D6 is connected to the output end of a diode D5;

[0018] VCM - 5V is connected to the diode D5;

[0019] The output ends of the diodes D5 and D6 are connected to the enable pin EN of the voltage regulator U1 in one path, and grounded through a parallel combination of capacitors C4, C5, and a resistor R6 in the other path;

[0020] The GND terminal of the voltage regulator U1 is grounded, and the VOUT terminal outputs AVCC5V.

[0021] As a further improvement of the above - mentioned technical solution:

[0022] The resistors R1 and R2 are current - limiting resistors;

[0023] +5.2V is output by DC - DC power supply from the network +5.2V;

[0024] The diode D1 is an anti - backflow diode, and the capacitor C1 is a supercapacitor.

[0025] In the discharge state, the capacitor C1 is connected to the clock battery - powered AVBAT network through the diode D2.

[0026] The power supply E1 is a lithium battery, the capacitor C3 is a voltage stabilizing capacitor, the resistor R5 is a safety resistor, the resistors R3 and R4 are voltage dividing resistors, and the capacitor C2 is an anti-shake capacitor.

[0027] The capacitors C4 and C5 are energy storage capacitors;

[0028] The capacitor C6 is the input capacitor of the voltage regulator U1.

[0029] The diodes D2, D3, and D4 form an AND logic gate.

[0030] The beneficial effects of the present utility model: The present utility model provides a multi-channel power supply and backup power logic circuit applicable to a new type of Internet of Things meter, aiming to solve the complex power supply and backup power logic born due to the performance and function requirements of the Internet of Things meter. Building the circuit with discrete devices has low cost, large adjustable space, high parameter flexibility, and low maintenance cost; the working logic is clear and convenient for problem troubleshooting; under the condition of meeting complex logic requirements, the flexibility is improved, the production cost is reduced, and the high procurement cost and maintenance cost brought by using an integrated power control chip are avoided. All logic points use diodes to build the logic. According to the diode characteristics, the circuit can automatically handle the power supply sequence after power-off and the charging logic after power-on, avoiding the logic control using a chip for compilation and saving the processor resources. A simple RC structure is used for delay LDO control, and the delay time is flexible. The circuit flexibly utilizes the characteristics of each device, fully demonstrating its flexibility and universality.

[0031] The present utility model is reasonable in design, low in cost, strong and durable, safe and reliable, simple to operate, time-saving and labor-saving, cost-saving, compact in structure and convenient to use. Description of the Drawings

[0032] Figure 1 is the circuit principle schematic diagram of the present utility model. Detailed Embodiment

[0033] As Figure 1 , a multi-channel power supply and backup power logic circuit for a new type of Internet of Things meter, includes a supercapacitor charging module and a voltage regulator U1;

[0034] The supercapacitor charging module includes a resistor module in which the resistors R1 and R2 are connected in parallel in series, a diode D1, and a capacitor C1;

[0035] The input ends of the parallel resistors R1 and R2 are connected to +5.2V;

[0036] One end of the capacitor C1 is grounded, and the other end is respectively connected to the diodes D1 and D2;

[0037] +5.2V is connected to the clock battery-powered AVBAT network and the VIN terminal of the voltage regulator U1 through the diode D3 respectively. The output terminal of the diode D3 is also grounded through the capacitor C6;

[0038] The network battery current ABATT is grounded through the parallel-connected capacitor C2 and resistor R4, and the other path is connected to the resistor R3;

[0039] The output terminal of the resistor R3 is connected to the diodes D4, D6 and the resistor R5 respectively;

[0040] The output terminal of the diode D4 is connected to the output terminal of the diode D3;

[0041] The resistor R5 is connected to the power supply E1, and the power supply E1 is shunted with the capacitor C3;

[0042] The output terminal of the diode D6 is connected to the output terminal of the diode D5;

[0043] VCM - 5V is connected to the diode D5;

[0044] The output terminals of the diodes D5 and D6 are connected to the enable pin EN of the voltage regulator U1 on one path, and to the ground through the parallel-connected capacitors C4, C5 and the resistor R6 on the other path;

[0045] The GND terminal of the voltage regulator U1 is grounded, and the VOUT terminal outputs AVCC5V.

[0046] As a further improvement of the above technical solution:

[0047] The resistors R1 and R2 are current-limiting resistors;

[0048] +5.2V is output by DC - DC power supply from the network +5.2V;

[0049] The diode D1 is an anti-backflow diode, and the capacitor C1 is a super capacitor.

[0050] In the discharge state, the capacitor C1 is connected to the clock battery-powered AVBAT network through the diode D2.

[0051] The power supply E1 is a lithium battery, the capacitor C3 is a voltage-regulating capacitor, the resistor R5 is a safety resistor, the resistors R3 and R4 are voltage-dividing resistors, and the capacitor C2 is a debounce capacitor.

[0052] The capacitors C4 and C5 are energy storage capacitors;

[0053] The capacitor C6 is the input capacitor of the voltage regulator U1.

[0054] As the preferred working principle: One path of the input voltage 5.2V is charged to the capacitor C1 and supplies power to the AVBAT through the diode D2 after being current-limited by the resistor group R1 and R2, and then passes through the diode D1; the other path of the input voltage 5.2V is output to the AVBAT through the diode D3;

[0055] After being filtered, divided by capacitance C2 and resistance R4, ABATT is branched into two paths through resistance R3. One path is connected to AVBAT through diode D4, and the other path is connected to the regulator drive enable terminal EN through diode D6.

[0056] After being regulated by capacitance C3, battery E1 is also connected to diodes D6 and D4 through resistance R6.

[0057] VCM_5v drives the enable terminal through diode D6.

[0058] The logic selection is composed of three diodes D2, D3, and D4 to complete the regulator input under different power supply modes; the regulator U1 provides a stable AVCC_5V voltage for the subsequent circuits such as MCU and memory under different power supply modes for the three input voltages.

[0059] The regulator output terminal Vout supplies power to the MCU and memory; ABATT is used for clock battery detection; VCM_5V is the output voltage of the DC-DC power supply.

[0060] The network +5.2V and VCM_5V use DC-DC to supply 5.2V and 5V voltages. R1, R2, D1, and C1 form the supercapacitor charging part. R1 and R2 are current-limiting resistors to prevent overload caused by excessive initial charging current; the D1 diode prevents the supercapacitor C1 from back-feeding after power-off. When discharging, C1 supplies power to the clock battery supply AVBAT network through D2. D2 forms an AND logic with D3 and D4, so that it can ensure that the power supply is used during power-on and energy storage devices are not used. The sizes of R1 and R2 determine whether the supercapacitor can be fully charged within 10 minutes.

[0061] E1 is a lithium battery. C3 is only used as a voltage-regulating capacitor. The resistance value of R5 is very small and can be ignored. R3 and R4 are high-precision resistors used for voltage division to facilitate the MCU to sample and monitor the battery voltage. C2 is an anti-shake capacitor to prevent sampling deviation. U1 is an LDO. D5 and D6 form an AND logic to supply the enable pin of the LDO. The functions of C4 and C5 are energy storage. When the front end of D5 and D6 loses power, the voltage on the enable pin will not drop immediately, but will slowly discharge through R6 and gradually drop below the threshold voltage of the enable pin, and the LDO will turn off. C6 is only the input capacitor of the LDO.

[0062] This circuit fully meets the logic requirements: use the power supply during power-on and do not use energy storage devices; give priority to using the supercapacitor for power supply after power-off; when there is no battery, the supercapacitor should meet the information processing requirements for a certain period of time, and then the supercapacitor only supplies power to the clock and ensures that the clock works for more than 48 hours without entering the low-power mode; when there is a battery after power-off, after the supercapacitor is discharged, the battery is used to supply the low-power mode and the clock.

[0063] The present utility model is fully described for clearer disclosure, and the prior art will not be enumerated one by one.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features; it is obvious for those skilled in the art to combine multiple technical solutions of the present utility model. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model. The technical content not described in detail in the present utility model is well-known technology.

Claims

1. A multi-channel power supply and backup power logic circuit for a new type of Internet of Things meter, characterized in that: It includes a supercapacitor charging module and a voltage regulator U1; The supercapacitor charging module includes a resistor module in series formed by resistors R1 and R2 in parallel, a diode D1, and a capacitor C1; The input ends of the parallel resistors R1 and R2 are connected to +5.2V; One end of the capacitor C1 is grounded, and the other end is connected to the diodes D1 and D2 respectively; +5.2V is connected to the clock battery-powered AVBAT network and the VIN terminal of the voltage regulator U1 through the diode D3 respectively, The output terminal of the diode D3 is also grounded through the capacitor C6; The network battery current ABATT is grounded through the parallel capacitor C2 and resistor R4 in one path, and connected to the resistor R3 in the other path; The output terminal of the resistor R3 is connected to the diodes D4, D6 and the resistor R5 respectively; The output terminal of the diode D4 is connected to the output terminal of the diode D3; The resistor R5 is connected to the power supply E1, and the power supply E1 is connected in parallel with the capacitor C3; The output terminal of the diode D6 is connected to the output terminal of the diode D5; VCM - 5V is connected to the diode D5; The output terminals of the diodes D5 and D6 are connected to the enable pin EN of the voltage regulator U1 in one path, and grounded through the parallel capacitor C4, C5 and resistor R6 in the other path; The GND terminal of the voltage regulator U1 is grounded, and the VOUT terminal outputs AVCC5V.

2. The multi - power - supply backup power logic circuit for the new Internet of Things meter according to claim 1, wherein: The resistors R1 and R2 are current-limiting resistors; +5.2V is output by the network +5.2V through DC-DC power supply; The diode D1 is an anti-backflow diode, and the capacitor C1 is a supercapacitor.

3. The multi - power - supply backup power logic circuit for the new Internet of Things meter according to claim 1, characterized in that: In the discharge state, the capacitor C1 is connected to the clock battery-powered AVBAT network through the diode D2.

4. The multi - power - supply backup power logic circuit for the new Internet of Things meter according to claim 1, characterized in that: The power supply E1 is a lithium battery, the capacitor C3 is a voltage-regulating capacitor, the resistor R5 is a safety resistor, the resistors R3 and R4 are voltage-dividing resistors, and the capacitor C2 is a debounce capacitor.

5. The multi-channel power supply backup power logic circuit for the new Internet of Things meter according to claim 1, characterized in that: The capacitors C4 and C5 are energy storage capacitors; The capacitor C6 is the input capacitor of the voltage regulator U1.

6. The multi-channel power supply backup power logic circuit for the new Internet of Things meter according to claim 1, characterized in that: The diodes D2 and D3, D4 form an AND logic gate.

Images