CN114301134A - Back-up power on-off control circuit - Google Patents
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Abstract
The invention discloses a backup power supply on-off control circuit, which comprises: back-up source circuit, central processing unit, main power supply, back-up source circuit's control end and central processing unit communication connection, back-up source's power connection end is connected with outside power consumption circuit power input end, main power supply electricity respectively, power consumption circuit's output is connected to central processing unit's input, the main power supply still is connected with central processing unit's power connection end, power consumption circuit's power connection end respectively. According to the invention, through designing the combination of multiple units such as the backup power circuit and the central processing unit, the charge-discharge control and the charge-discharge voltage monitoring of the backup power are realized, so that the performance and the service life of the backup power are improved, and the power supply stability is ensured.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a back-up power supply on-off control circuit.
Background
With the development of modern society, the application scene of equipment is more and more complex, the construction of cloud, pipe, side and end architecture of the universal power internet of things requires terminal equipment to meet the requirements of high-performance concurrency, large-capacity storage and multiple acquisition objects, and the intelligent fusion terminal equipment integrates the functions of power supply and power information acquisition of a power distribution station area, data acquisition of each acquisition terminal or electric energy meter, equipment state monitoring and communication networking, local analysis and decision making, cooperative computing and the like. With the improvement of the requirements on terminal equipment, the equipment is not equipment for realizing a single function, but is a multifunctional integrated intelligent terminal, and the equipment is required to have good performances such as real-time performance, reliability, fault self-recovery and the like so as to meet the requirements of freezing and storing real-time data, recording faults, executing protection instructions and the like under emergency conditions, so that the equipment is required to normally work in the whole life cycle, and the equipment is required to be provided with a backup power supply.
The equipment on the current market basically adopts super capacitor or battery as back-up source, but most function of control circuit is not perfect enough, or does not have the control of charging, discharging, causes the power easily and overcharges and overdischarging, influences back-up source's performance and life. Or the charging and discharging control precision is not enough, and the stability of power supply cannot be ensured.
The prior art discloses a backup power detection system and a detection method thereof. The system comprises an upper computer and a backup power supply detection device, the backup power supply detection device is controlled by the upper computer, the function and static power consumption detection of a backup power supply protection plate are achieved through a simulation battery unit, the charging function detection of the backup power supply is achieved through a first charging and discharging unit, the discharging function detection and the overcurrent protection and recovery time function detection of the backup power supply are achieved through a second charging and discharging unit and a third charging and discharging unit, and therefore the detection of multiple functions and parameters of the backup power supply is achieved. The scheme only detects the time limit backup power supply and does not realize the control of charging and discharging of the backup power supply.
Disclosure of Invention
The invention provides a backup power supply on-off control circuit for overcoming the defects that the performance and the service life of a backup power supply are influenced by the control of the backup power supply in the prior art and the power supply stability cannot be ensured.
The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:
a backup power on-off control circuit, comprising: back-up source circuit, central processing unit, main power supply, back-up source circuit's control end and central processing unit communication connection, back-up source's power connection end is connected with outside power consumption circuit power input end, main power supply electricity respectively, power consumption circuit's output is connected to central processing unit's input, the main power supply still is connected with central processing unit's power connection end, power consumption circuit's power connection end respectively.
Further, the backup power circuit includes: resistors R6, R12, R14, R15, R22, R23, R24, R25 and R33, a MOS transistor Q1, triodes Q3 and Q5, a diode D21 and a capacitor EC5, wherein the specific connection relationship is as follows:
the anode of the main power supply is connected to the anode of a diode D21, one end of a resistor R25, the other end of a resistor R25 is grounded through a resistor R14, the cathode of the diode D21 is connected to one end of a resistor R22, one end of a resistor R23, one end of a capacitor EC5, one end of a resistor R24, one end of a resistor R15 and the base of a transistor Q3, respectively, the other end of the resistor R22 and the other end of a resistor R23 are connected to the collector of a transistor Q5, the base of a transistor Q5 is connected to the control output terminal of the cpu, one end of a resistor R33, the other end of a resistor R33 and the emitter of a transistor Q5 are grounded, the other end of the capacitor EC5, the other end of a resistor R24 and the emitter of a transistor Q3 are grounded, the other end of the resistor R15 is connected to a 3.3V power supply, the collector of the transistor is connected to one end of a resistor R15, the G pole of a MOS transistor Q15, and the other end of the resistor R15 are connected to the G, The S pole of the MOS transistor Q1 is connected to the P connection point of the charge and discharge monitoring circuit, and the D pole of the MOS transistor Q1 is connected to the external power utilization circuit.
Further, the backup power circuit further comprises a charge-discharge voltage monitoring circuit, and the charge-discharge voltage monitoring circuit comprises: the specific connection relations of the resistors R9, R26, R29 and the diodes D17, D18 and D19 are as follows: the anode of the main power supply is respectively connected to the anode of a diode D17 and the anode of a diode D18, the cathode of a diode D17 is respectively connected to the cathode of a diode D19 and a P connection point, the cathode of a diode D18 is connected to the anode of a backup power supply JP2 through a resistor R9, the cathode of the backup power supply JP2 is grounded, the anode of a diode D19 is respectively connected to the anode of a backup power supply JP2 and one end of a resistor R26, the other end of the resistor R26 is connected to the sampling input SCAP _ AD1 of the processor at the center and one end of a resistor R29, and the other end of the resistor R29 is grounded.
Further, the power utilization circuit is an electric energy metering processing unit, and the electric energy metering processing unit includes: measurement chip, electric energy data sampling input, reference voltage circuit, power supply circuit, crystal oscillator circuit, communication circuit, active and reactive pulse output circuit, reference voltage circuit, power supply circuit all are connected with measurement chip's power connect pin, the electric energy data sampling input is connected with back-up source's output, crystal oscillator circuit and measurement chip crystal oscillator pin are connected, active and reactive pulse output circuit is connected with measurement chip's active and reactive pulse output pin, measurement chip passes through communication circuit and is connected with the central processing unit input.
Further, the reference voltage circuit includes: the specific connection relationship among the capacitors C69, C70, C71 and C72 is as follows: reference voltage REFV is connected to one end of a capacitor C69 and one end of a capacitor C70, the other end of the capacitor C69 and the other end of the capacitor C70 are both grounded, a power supply AVCC is respectively connected to one end of a capacitor C71, one end of a capacitor C72, an AVCC pin of a metering chip and a connection point D, the other end of the capacitor C71 and the other end of the capacitor C72 are both grounded, the REFV pin of the metering chip is connected with reference voltage REFV, and a GEND pin and an RA pin of the metering chip are both grounded.
Further, the power supply circuit includes: the capacitors C73, C74, C75, C76, C77, C78 and the resistor R127 are specifically connected in the following relationship: the power VCC is connected to one end of a capacitor C73, one end of a capacitor C74, one end of a capacitor C75 and one end of a capacitor C76 respectively, a voltage-stabilizing output pin VO of the metering chip is connected to one end of a capacitor C77 and one end of a capacitor C78 respectively, the other end of a capacitor C73, the other end of a capacitor C74, the other end of a capacitor C75, the other end of a capacitor C76, the other end of a capacitor C77 and the other end of a capacitor C78 are all grounded, the power VCC is also connected to one end of a resistor 127, a DVCC pin and an RB pin respectively, and the other end of the resistor R127 is connected to a connecting point D.
Further, the crystal oscillator circuit includes: the specific connection relationship among the resistors R138, R133, R135, the capacitors C81, C83 and the crystal oscillator Y2 is as follows: the pin XI of the metering chip is connected to one end of the resistor R138, one end of the crystal oscillator Y2 and one end of the capacitor C81, the pin XO of the metering chip is connected to the other end of the resistor R138, the other end of the crystal oscillator Y2 and one end of the capacitor C83 respectively, the other end of the capacitor C83 and the other end of the capacitor C81 are both grounded, and the pin RSTN and the pin INTN of the metering chip are connected to the power supply VCC through the resistor R133 and the resistor R135 respectively.
Further, the communication circuit includes: the specific connection relationship among the resistors R141, R143, R144 and R147, the capacitors C85, C86 and C87 is as follows:
the SCSN pin of measurement chip is connected to the power VCC through resistance R141, the SCLK pin of measurement chip is connected to the one end of resistance R143 respectively, the one end of electric capacity C85, the other end of resistance R143 is connected to the SPI4_ SCK pin of central processing unit, the SDI pin of measurement chip is connected to the one end of resistance R144 respectively, the one end of electric capacity C86, the other end of resistance R144 is connected to SPI4_ MOSI pin, the SDO pin of measurement chip is connected to the one end of resistance R147 respectively, the one end of electric capacity C87, the other end of resistance R147 is connected to SPI4_ MOSO pin.
Further, the active and reactive pulse output circuit comprises: r150 and R151 are specifically connected in a way that: the CF1 pin of the metering chip is connected to one end of the resistor R150, the other end of the resistor R150 serves as an active output end, the CF2 pin of the metering chip is connected to one end of the resistor R151, and the other end of the resistor R151 serves as a reactive output end.
Furthermore, a VAP pin, a VAN pin, a VBP pin, a VBN pin, a VCP pin and a VCN pin of the metering chip are used as voltage sampling input pins, and an IAP pin, an IAN pin, an IBP pin, an IBN pin, an ICP pin, an ICN pin, an INP pin and an INN pin of the metering chip are used as current sampling input pins.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the invention, through designing the combination of multiple units such as the backup power circuit and the central processing unit, the charge-discharge control and the charge-discharge voltage monitoring of the backup power are realized, so that the performance and the service life of the backup power are improved, and the power supply stability is ensured.
Drawings
Fig. 1 is a schematic block diagram of a backup power on-off control circuit according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a backup power circuit according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a charging/discharging voltage monitoring circuit according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of a chip pin connection relationship according to an embodiment of the invention.
FIG. 5 is a circuit diagram of a reference voltage of the power metering processing unit according to the embodiment of the invention.
FIG. 6 is a schematic diagram of a power supply circuit of the electric energy metering processing unit according to the embodiment of the present invention.
FIG. 7 is a schematic diagram of a crystal oscillator circuit of the electric energy metering processing unit according to the embodiment of the present invention.
Fig. 8 is a schematic diagram of a communication circuit of the electric energy metering processing unit according to the embodiment of the present invention.
Fig. 9 is a schematic diagram of an active and reactive pulse output circuit of the electric energy metering processing unit according to the embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
As shown in fig. 1, a backup power on-off control circuit is characterized by comprising: back-up source circuit, central processing unit, main power supply, back-up source circuit's control end and central processing unit communication connection, back-up source's power connection end is connected with outside power consumption circuit power input end, main power supply electricity respectively, power consumption circuit's output is connected to central processing unit's input, the main power supply still is connected with central processing unit's power connection end, power consumption circuit's power connection end respectively.
The backup power supply circuit is connected with the central processing unit, the backup power supply circuit is connected with the main power supply and the power utilization circuit, the backup power supply circuit is connected with the power utilization circuit, the central processing unit is connected with the backup power supply circuit, and the backup power supply circuit is connected with the power utilization circuit.
Further, as shown in fig. 2, the backup power circuit includes: resistors R6, R12, R14, R15, R22, R23, R24, R25 and R33, a MOS transistor Q1, triodes Q3 and Q5, a diode D21 and a capacitor EC5, wherein the specific connection relationship is as follows: the anode of the main power supply is connected to the anode of a diode D21, one end of a resistor R25, the other end of a resistor R25 is grounded through a resistor R14, the cathode of the diode D21 is connected to one end of a resistor R22, one end of a resistor R23, one end of a capacitor EC5, one end of a resistor R24, one end of a resistor R15 and the base of a transistor Q3, respectively, the other end of the resistor R22 and the other end of a resistor R23 are connected to the collector of a transistor Q5, the base of a transistor Q5 is connected to the control output terminal of the cpu, one end of a resistor R33, the other end of a resistor R33 and the emitter of a transistor Q5 are grounded, the other end of the capacitor EC5, the other end of a resistor R24 and the emitter of a transistor Q3 are grounded, the other end of the resistor R15 is connected to a 3.3V power supply, the collector of the transistor is connected to one end of a resistor R15, the G pole of a MOS transistor Q15, and the other end of the resistor R15 are connected to the G, The S pole of the MOS transistor Q1 is connected to the P connection point of the charge and discharge monitoring circuit, and the D pole of the MOS transistor Q1 is connected to the external power utilization circuit.
It should be noted that, as shown in fig. 2, during normal operation, the main power supply 24V1 is turned on, the transistor Q5 is in an off state, and at this time, the base of Q5, that is, YKCH, is at a high level, and a resistor R14 and R25 divide the voltage to provide a bias voltage to turn on the transistor Q3, so as to control the MOS transistor Q1 of the main circuit to be turned on, and the external power consumption device is powered by the main power supply, and the backup power supply enters a charging state.
Switching and maintaining a backup power supply: when the main power supply is powered off (24V1 is powered off), the power supply mode is switched to the power supply of the backup power supply, the triode Q3 is maintained in a conducting state by providing bias voltage through R15 and R24 partial pressure in the resistor, the MOS transistor Q1 of the main loop is further controlled to be maintained in a conducting state, the external power equipment is powered by the backup power supply, and the backup power supply enters a discharging state.
Backup power source shutdown circuit: after the external equipment finishes processing actions such as data freezing, fault filtering and the like, the central processing unit outputs a low level through controlling IO (input/output), namely a YKCH4 pin, controls the conduction of the triode Q5, divides voltage through the resistors R22, R23 and R15, turns off the triode Q3, further controls the MOS (metal oxide semiconductor) tube Q1 of the main loop to be switched off from conduction, the power supply main loop is disconnected, and the external electric equipment enters a power-off state.
In a specific embodiment, the MOS transistor Q1 may be an industrial MOS transistor, on-off control is performed through a dedicated IO port, response speed is increased, and a control circuit does not need voltage maintenance by using single pulse turn-off.
Example 2
The backup power supply circuit further includes a charging and discharging voltage monitoring circuit, which is described in detail in this embodiment, and as shown in fig. 3, the charging and discharging voltage monitoring circuit includes: the specific connection relations of the resistors R9, R26, R29 and the diodes D17, D18 and D19 are as follows: the anode of the main power supply is respectively connected to the anode of a diode D17 and the anode of a diode D18, the cathode of a diode D17 is respectively connected to the cathode of a diode D19 and a P connection point, the cathode of a diode D18 is connected to the anode of a backup power supply JP2 through a resistor R9, the cathode of the backup power supply JP2 is grounded, the anode of a diode D19 is respectively connected to the anode of a backup power supply JP2 and one end of a resistor R26, the other end of the resistor R26 is connected to the sampling input SCAP _ AD1 of the processor at the center and one end of a resistor R29, and the other end of the resistor R29 is grounded.
It should be noted that, as shown in the figure, in the present invention, the central processing unit performs real-time voltage sampling on the backup power supply (i.e., JP2) through the AD interface (i.e., the SCAP _ AD pin), and determines whether the voltage is abnormal according to the preset voltage threshold. In the charging and discharging voltage monitoring circuit, the resistors are high-precision low-temperature drift resistors, so that the voltage sampling value is more accurate.
It should be noted that, during the discharging process, the central processing unit monitors the electric quantities such as current and voltage of the power supply system, and after the data such as the electric quantity are completely stored, the central processing unit cooperates with the charging control circuit to adjust the discharging time of the backup power supply.
Example 3
Based on the above backup power circuit, this embodiment elaborates the connection relationship of the power utilization circuit, and further, the power utilization circuit is an electric energy metering processing unit, and the electric energy metering processing unit includes: measurement chip, electric energy data sampling input, reference voltage circuit, power supply circuit, crystal oscillator circuit, communication circuit, active reactive pulse output circuit, reference voltage circuit, power supply circuit all are connected with measurement chip's power connect pin, electric energy data sampling input is connected with back-up source's output, crystal oscillator circuit and measurement chip crystal oscillator pin are connected, active reactive pulse output circuit is connected with measurement chip's active reactive pulse output pin, measurement chip passes through communication circuit and is connected with the central processing unit input, measurement chip's model is: RN 8302.
Further, as shown in fig. 4-5, the reference voltage circuit provides a voltage reference for voltage and current sampling; the reference voltage circuit includes: the specific connection relationship among the capacitors C69, C70, C71 and C72 is as follows: reference voltage REFV is connected to one end of a capacitor C69 and one end of a capacitor C70, the other end of the capacitor C69 and the other end of the capacitor C70 are both grounded, a power supply AVCC is respectively connected to one end of a capacitor C71, one end of a capacitor C72, an AVCC pin of a metering chip and a connection point D, the other end of the capacitor C71 and the other end of the capacitor C72 are both grounded, the REFV pin of the metering chip is connected with reference voltage REFV, and a GEND pin and an RA pin of the metering chip are both grounded.
Further, as shown in fig. 6, the power supply circuit is used to provide power for the operation of the metering chip, and the power supply circuit includes: the capacitors C73, C74, C75, C76, C77, C78 and the resistor R127 are specifically connected in the following relationship: the power VCC is connected to one end of a capacitor C73, one end of a capacitor C74, one end of a capacitor C75 and one end of a capacitor C76 respectively, a voltage-stabilizing output pin VO of the metering chip is connected to one end of a capacitor C77 and one end of a capacitor C78 respectively, the other end of a capacitor C73, the other end of a capacitor C74, the other end of a capacitor C75, the other end of a capacitor C76, the other end of a capacitor C77 and the other end of a capacitor C78 are all grounded, the power VCC is also connected to one end of a resistor 127, a DVCC pin and an RB pin respectively, and the other end of the resistor R127 is connected to a connecting point D.
Further, as shown in fig. 7, the crystal oscillator circuit is configured to provide a stable clock signal for operation of the metering chip, and the crystal oscillator circuit includes: the specific connection relationship among the resistors R138, R133, R135, the capacitors C81, C83 and the crystal oscillator Y2 is as follows: the pin XI of the metering chip is connected to one end of the resistor R138, one end of the crystal oscillator Y2 and one end of the capacitor C81, the pin XO of the metering chip is connected to the other end of the resistor R138, the other end of the crystal oscillator Y2 and one end of the capacitor C83 respectively, the other end of the capacitor C83 and the other end of the capacitor C81 are both grounded, and the pin RSTN and the pin INTN of the metering chip are connected to the power supply VCC through the resistor R133 and the resistor R135 respectively.
Further, as shown in fig. 8, the communication circuit is configured to upload processed data of voltage, current, active power, reactive power, and the like to the central processing unit, and the communication circuit includes: the specific connection relationship among the resistors R141, R143, R144 and R147, the capacitors C85, C86 and C87 is as follows:
the SCSN pin of measurement chip is connected to the power VCC through resistance R141, the SCLK pin of measurement chip is connected to the one end of resistance R143 respectively, the one end of electric capacity C85, the other end of resistance R143 is connected to the SPI4_ SCK pin of central processing unit, the SDI pin of measurement chip is connected to the one end of resistance R144 respectively, the one end of electric capacity C86, the other end of resistance R144 is connected to SPI4_ MOSI pin, the SDO pin of measurement chip is connected to the one end of resistance R147 respectively, the one end of electric capacity C87, the other end of resistance R147 is connected to SPI4_ MOSO pin.
Further, as shown in fig. 9, the active and reactive pulse output circuit for external calibration includes: r150 and R151 are specifically connected in a way that: the CF1 pin of the metering chip is connected to one end of the resistor R150, the other end of the resistor R150 serves as an active output end, the CF2 pin of the metering chip is connected to one end of the resistor R151, and the other end of the resistor R151 serves as a reactive output end.
Furthermore, a VAP pin, a VAN pin, a VBP pin, a VBN pin, a VCP pin and a VCN pin of the metering chip are used as voltage sampling input pins, and an IAP pin, an IAN pin, an IBP pin, an IBN pin, an ICP pin, an ICN pin, an INP pin and an INN pin of the metering chip are used as current sampling input pins.
It should be noted that, in the electric energy metering processing unit, the electric energy metering needs to perform a large amount of data analysis and operation, and calculate data such as voltage, current effective value, active power, reactive power, phase angle, and the like, the required time is long, under the condition that the main power supply suddenly loses power, the backup power supply can be powered off after the electric energy metering work is finished, the processing time is related to the amplitude and frequency of the voltage and the current, and belongs to dynamic change, and the power supply is turned off by judging the work such as the data processing state, so that the reliability of the equipment data is ensured, and the problems of over-discharge of the backup power supply and the like are avoided.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A backup power on-off control circuit, comprising: back-up source circuit, central processing unit, main power supply, back-up source circuit's control end and central processing unit communication connection, back-up source's power connection end is connected with outside power consumption circuit power input end, main power supply electricity respectively, power consumption circuit's output is connected to central processing unit's input, the main power supply still is connected with central processing unit's power connection end, power consumption circuit's power connection end respectively.
2. A backup power on-off control circuit as claimed in claim 1, wherein said backup power circuit comprises: resistors R6, R12, R14, R15, R22, R23, R24, R25 and R33, a MOS transistor Q1, triodes Q3 and Q5, a diode D21 and a capacitor EC5, wherein the specific connection relationship is as follows:
the anode of the main power supply is connected to the anode of a diode D21, one end of a resistor R25, the other end of a resistor R25 is grounded through a resistor R14, the cathode of the diode D21 is connected to one end of a resistor R22, one end of a resistor R23, one end of a capacitor EC5, one end of a resistor R24, one end of a resistor R15 and the base of a transistor Q3, respectively, the other end of the resistor R22 and the other end of a resistor R23 are connected to the collector of a transistor Q5, the base of a transistor Q5 is connected to the control output terminal of the cpu, one end of a resistor R33, the other end of a resistor R33 and the emitter of a transistor Q5 are grounded, the other end of the capacitor EC5, the other end of a resistor R24 and the emitter of a transistor Q3 are grounded, the other end of the resistor R15 is connected to a 3.3V power supply, the collector of the transistor is connected to one end of a resistor R15, the G pole of a MOS transistor Q15, and the other end of the resistor R15 are connected to the G, The S pole of the MOS transistor Q1 is connected to the P connection point of the charge and discharge monitoring circuit, and the D pole of the MOS transistor Q1 is connected to the external power utilization circuit.
3. The on-off control circuit of a backup power supply according to claim 1, wherein the backup power supply circuit further comprises a charge-discharge voltage monitoring circuit, and the charge-discharge voltage monitoring circuit comprises: the specific connection relations of the resistors R9, R26, R29 and the diodes D17, D18 and D19 are as follows: the anode of the main power supply is respectively connected to the anode of a diode D17 and the anode of a diode D18, the cathode of a diode D17 is respectively connected to the cathode of a diode D19 and a P connection point, the cathode of a diode D18 is connected to the anode of a backup power supply JP2 through a resistor R9, the cathode of the backup power supply JP2 is grounded, the anode of a diode D19 is respectively connected to the anode of a backup power supply JP2 and one end of a resistor R26, the other end of the resistor R26 is connected to the sampling input SCAP _ AD1 of the processor at the center and one end of a resistor R29, and the other end of the resistor R29 is grounded.
4. The on-off control circuit of a backup power supply according to claim 1, wherein the power utilization circuit is an electric energy metering processing unit, and the electric energy metering processing unit comprises: measurement chip, electric energy data sampling input, reference voltage circuit, power supply circuit, crystal oscillator circuit, communication circuit, active and reactive pulse output circuit, reference voltage circuit, power supply circuit all are connected with measurement chip's power connect pin, the electric energy data sampling input is connected with back-up source's output, crystal oscillator circuit and measurement chip crystal oscillator pin are connected, active and reactive pulse output circuit is connected with measurement chip's active and reactive pulse output pin, measurement chip passes through communication circuit and is connected with the central processing unit input.
5. A backup power on-off control circuit according to claim 4, wherein said reference voltage circuit comprises: the specific connection relationship among the capacitors C69, C70, C71 and C72 is as follows: reference voltage REFV is connected to one end of a capacitor C69 and one end of a capacitor C70, the other end of the capacitor C69 and the other end of the capacitor C70 are both grounded, a power supply AVCC is respectively connected to one end of a capacitor C71, one end of a capacitor C72, an AVCC pin of a metering chip and a connection point D, the other end of the capacitor C71 and the other end of the capacitor C72 are both grounded, the REFV pin of the metering chip is connected with reference voltage REFV, and a GEND pin and an RA pin of the metering chip are both grounded.
6. A backup power on-off control circuit according to claim 4, wherein said power circuit comprises: the capacitors C73, C74, C75, C76, C77, C78 and the resistor R127 are specifically connected in the following relationship: the power VCC is connected to one end of a capacitor C73, one end of a capacitor C74, one end of a capacitor C75 and one end of a capacitor C76 respectively, a voltage-stabilizing output pin VO of the metering chip is connected to one end of a capacitor C77 and one end of a capacitor C78 respectively, the other end of a capacitor C73, the other end of a capacitor C74, the other end of a capacitor C75, the other end of a capacitor C76, the other end of a capacitor C77 and the other end of a capacitor C78 are all grounded, the power VCC is also connected to one end of a resistor 127, a DVCC pin and an RB pin respectively, and the other end of the resistor R127 is connected to a connecting point D.
7. A back-up power supply on-off control circuit as claimed in claim 4, wherein said crystal oscillator circuit comprises: the specific connection relationship among the resistors R138, R133, R135, the capacitors C81, C83 and the crystal oscillator Y2 is as follows: the pin XI of the metering chip is connected to one end of the resistor R138, one end of the crystal oscillator Y2 and one end of the capacitor C81, the pin XO of the metering chip is connected to the other end of the resistor R138, the other end of the crystal oscillator Y2 and one end of the capacitor C83 respectively, the other end of the capacitor C83 and the other end of the capacitor C81 are both grounded, and the pin RSTN and the pin INTN of the metering chip are connected to the power supply VCC through the resistor R133 and the resistor R135 respectively.
8. A backup power on-off control circuit according to claim 4, wherein said communication circuit comprises: the specific connection relationship among the resistors R141, R143, R144 and R147, the capacitors C85, C86 and C87 is as follows:
the SCSN pin of measurement chip is connected to the power VCC through resistance R141, the SCLK pin of measurement chip is connected to the one end of resistance R143 respectively, the one end of electric capacity C85, the other end of resistance R143 is connected to the SPI4_ SCK pin of central processing unit, the SDI pin of measurement chip is connected to the one end of resistance R144 respectively, the one end of electric capacity C86, the other end of resistance R144 is connected to SPI4_ MOSI pin, the SDO pin of measurement chip is connected to the one end of resistance R147 respectively, the one end of electric capacity C87, the other end of resistance R147 is connected to SPI4_ MOSO pin.
9. A backup power supply on-off control circuit according to claim 4, characterized in that the active and reactive pulse output circuit comprises: r150 and R151 are specifically connected in a way that: the CF1 pin of the metering chip is connected to one end of the resistor R150, the other end of the resistor R150 serves as an active output end, the CF2 pin of the metering chip is connected to one end of the resistor R151, and the other end of the resistor R151 serves as a reactive output end.
10. The backup power on-off control circuit according to claim 4, wherein a VAP pin, a VAN pin, a VBP pin, a VBN pin, a VCP pin, and a VCN pin of the metering chip are used as voltage sampling input pins, and an IAP pin, an IAN pin, an IBP pin, an IBN pin, an ICP pin, an ICN pin, an INP pin, and an INN pin are used as current sampling input pins.
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| CN114726061A (en) * | 2022-06-01 | 2022-07-08 | 深圳市菲尼基科技有限公司 | Control system for lithium battery power management |
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