CN218243111U - Fault indicator collecting unit for controlling GPRS working mode and improving online rate - Google Patents

Abstract

The utility model relates to a control GPRS mode promotes fault indicator of online rate and collects unit, including collecting the unit, it is equipped with the GRPS module to collect the unit, still be equipped with GPRS power supply control circuit, GPRS power supply control circuit's power input end is connected and is collected the GPRS power supply output of unit, the power input end of GPRS module is connected to power output end, GPRS power supply control circuit is equipped with the switch chip, the switch chip is equipped with the on-off control pin that is used for connecting the corresponding control output of the singlechip that collects the unit, the power supply circuit that collects the unit is including getting the electric circuit, stand-by power supply, power supply switching circuit and charging control circuit. The utility model discloses can utilize the control fault indicator to collect the target that the operational mode of unit GPRS communication module reaches the whole consumption of reduction system under the support of singlechip to the charging of the prior stand-by power supply of guaranteeing when getting electric circuit electric current less, thereby improve fault indicator online rate.

Description

Fault indicator collecting unit for controlling GPRS working mode and improving online rate

Technical Field

The utility model relates to a control GPRS mode promotes fault indicator of online rate and collects unit.

Background

Fault location and restoration in the circuit are the core of distribution network automation, a robust intelligent distribution network is built, the automation rate of the distribution network is improved, real and effective monitoring needs to be carried out on the circuit, fault analysis is carried out according to monitoring data simultaneously, the fault location is timely located when the power circuit breaks down, the fault location is displayed, operation and maintenance personnel are guided to be quickly located through various communication means, faults are eliminated, power supply is recovered, a guarantee and intelligent decision is provided for safe and stable operation of the power circuit, therefore, a fault indicator of the circuit needs to detect power circuit data in real time and communicate with a master station server of a power supply station/power grid, and the power consumption of the fault indicator is high.

The fault indicator for the power grid line generally comprises a collection unit, a collection unit and a power supply unit for supplying power, wherein the collection unit is provided with a plurality of current transformers for obtaining current information on a corresponding line, corresponding line data are formed after the current information is processed by a single chip microcomputer of the collection unit and are sent to the collection unit, the collection unit collects and processes related line data, fault data such as fault types and positions are formed when a fault occurs in the line, the collection unit is provided with a GPRS (general packet radio service) module (GPRS communication circuit) for remote communication, the GPRS module is in real-time communication with a master station server of a power supply office/power grid, line detection data and the like are transmitted to a master station, the collection unit obtains electric energy through the power supply unit of the fault indicator, the collection unit is provided with 5V direct current output, 14V direct current from the power supply unit is converted into 5V direct current through an internal circuit of the collection unit, and is connected to the GPRS module and used for supplying power to the GPRS module.

The power supply unit of the existing fault indicator mostly uses a current transformer to get power, so that the power supply of the fault indicator fluctuates along with the fluctuation of line current, the fault indicator is frequently disconnected due to insufficient power supply in the period of low line current such as night, and in addition, the fault indicator is also frequently disconnected for some power lines with low current. Meanwhile, the working current of the GPRS module in the starting process is very large, and the communication with the master station server can be realized only when the line current for getting electricity is low and the power supply is insufficient. However, even if a backup power supply is provided, the improvement of the online rate is limited because in the case where the supply and collection unit operates, if the current of the grid line is too small, the power-taking circuit often cannot effectively charge the battery used as the backup power supply, and therefore, in the line where the failure indicator is liable to be disconnected, there is a case where the backup power supply cannot exert its function, resulting in the failure indicator not being able to communicate with the master station server. For example, when the GPRS module is in sleep, the power is only 7mW; when the power is on, the peak value of the power can reach 7W, the power consumption of the fault indicator is only 0.2W, the GPRS module has high requirement on power supply when being on, if the power supply is insufficient, the power supply voltage can be reduced when the GPRS module is started, the indicator is turned off, the power-taking voltage of a circuit is increased, the collecting unit is started, and the GPRS module is restarted, so that the collecting unit is frequently restarted, can not be connected with a master station server, and can not charge a battery.

Although people try to reduce the power consumption of the fault indicator in various ways and achieve certain effects, the phenomenon that the online rate of the fault indicator in a main station server is low or even zero still exists in occasions or time periods when the current in a power-taking line is low, and a new technical route needs to be developed and a new solution is provided.

SUMMERY OF THE UTILITY MODEL

For overcoming prior art's above-mentioned defect, the utility model provides a control GPRS mode promotes fault indicator of online rate and collects the unit to can reduce or avoid collecting the phenomenon that the unit frequently restarts when getting the electric power supply when not enough under the control of singlechip.

The technical scheme of the utility model is that: the utility model provides a control GPRS mode promotes fault indicator of online rate and collects unit, includes collects the unit, collect the unit and be equipped with the GRPS module, still be equipped with GPRS power supply control circuit, GPRS power supply control circuit's power (mains voltage) input is connected the GPRS power supply output that collects the unit, and power (mains voltage) output is connected the power input end of GPRS module, GPRS power supply control circuit is equipped with switch chip, switch chip is equipped with the on-off control pin that is used for connecting the corresponding control output of the singlechip that collects the unit, can switch on or break off GPRS's power under the control of singlechip from this.

Generally, an input pin (or called pin) of the switch chip forms/is connected with a power input end of the GPRS power supply control circuit, an output pin forms/is connected with a power output end of the GPRS power supply control circuit, a single chip microcomputer of the collecting unit controls the on-off state of the switch chip through corresponding control output, and then the on-off state between the GPRS power supply output of the collecting unit and the power input end of the GPRS module is controlled.

Preferably, the switch chip adopts a single-channel load switch (chip) with model number TPS 22918.

Preferably, the GPRS module is a GPRS module (chip) with the model number of ME 3630-W.

Preferably, the GPRS module is provided with a power-on control pin and a dormancy wakeup control pin, and the power-on control pin and the dormancy wakeup control pin of the GPRS module are respectively used for connecting to corresponding control IO pins of the single chip microcomputer of the collection unit through a power-on control line and a dormancy control line, so that the GPRS module can be powered on and dormant under the control of the single chip microcomputer.

Preferably, the collection unit is provided with a power supply circuit (which can be called as a power supply unit of the fault indicator), the power supply circuit comprises a power supply circuit, a standby power supply and a power supply switching circuit, the power supply switching circuit is provided with two input ends and an output end, the two input ends are respectively connected with the output end of the power supply circuit and the standby power supply, and the output end is the power supply output of the power supply circuit.

Preferably, the standby power supply adopts one or more rechargeable batteries, and the rechargeable batteries form a rechargeable battery pack.

Preferably, the power switching circuit is provided with two power switching diodes, anodes of the two power switching diodes are respectively connected with corresponding input ends of the power switching circuit, and cathodes of the two power switching diodes are both connected with an output end of the power switching circuit.

Preferably, a charging control circuit is arranged between the power taking circuit and the standby power supply, the input end of the charging control circuit is connected with the output end of the power taking circuit, and the output end of the charging control circuit is connected with the standby power supply.

Preferably, the charging control circuit is provided with a voltage stabilizing circuit, a voltage detection circuit, a control circuit and a switch circuit, the output of the power taking circuit is connected to the input end of the voltage stabilizing circuit, the output of the voltage stabilizing circuit is connected to the input end of the switch circuit, the output of the switch circuit is the output of the charging circuit and is used for connecting the standby power supply, the output of the standby power supply is connected to the input end of the voltage detection circuit, the output of the voltage detection circuit is connected to the control end of the control circuit, and the output of the control circuit is connected to the control end of the switch circuit.

Preferably, the voltage stabilizing circuit is provided with a voltage stabilizing chip, the voltage detection circuit is provided with a voltage detection chip, the control circuit is provided with a control NMOS (N-Metal-Oxide-Semiconductor) tube, the switch circuit is provided with a switch PMOS (P-Metal-Oxide-Semiconductor) tube, the output of the power taking circuit is connected to an input pin (IN pin) of the voltage stabilizing chip, the output of the standby power supply is connected to an input pin (VIN pin) of the voltage detection chip, the source (S pole) of the control NMOS tube is grounded, the output pin of the voltage detection chip is connected to the grid (G pole) of the control NMOS tube, the grid of the PMOS tube is connected to the drain (D pole) of the control NMOS tube, the source of the switch PMOS tube is connected to the output pin (OUT pole) of the voltage stabilizing chip, and the drain is connected to the standby power supply. When the output of the standby power supply is lower than a corresponding set value (or the level of an input pin of the voltage detection chip is lower than a corresponding set value), the output pin (VOUT pin) of the voltage detection chip outputs high level, the NMOS tube is used for controlling to be conducted, the PMOS tube is used for switching on, and the power circuit can be used for charging the standby power supply; when the output of the standby power supply is in a normal range, the output pin of the voltage detection chip outputs a low level, the NMOS tube for control is cut off, the PMOS tube for switch is cut off, and the power taking circuit does not charge the standby power supply.

Preferably, the voltage stabilizing chip is a chip with a model number of LM 317.

Preferably, the voltage detection chip is an XC61CN3702MR-G chip, the control NMOS tube is a 2N7002 NMOS tube, and the switch PMOS tube is a Si4435DDY PMOS tube.

Preferably, the output of the standby power supply is connected to a voltage regulation pin (adj pin) of the voltage regulation chip, and an external resistor is arranged between the voltage regulation pin and the input pin of the voltage regulation chip.

Preferably, the output of the standby power supply is divided by a resistor voltage dividing circuit and then connected to an input pin (VIN pin) of the voltage detection chip, the resistor voltage dividing circuit is formed by connecting a first voltage dividing resistor and a second voltage dividing resistor in series, the outer end of the first voltage dividing resistor (the end not connected with the second voltage dividing resistor) is connected to the input of the standby power supply, the outer end of the second voltage dividing resistor (the end not connected with the first voltage dividing resistor) is grounded, a connection point of the input pin of the voltage detection chip on the resistor voltage dividing circuit is located between the first voltage dividing resistor and the second voltage dividing resistor, the input pin of the voltage detection chip is grounded through a filter capacitor, and a ground pin (VSS pin) of the voltage detection chip is grounded.

Preferably, the gate of the NMOS transistor for control is grounded through a zener diode, and is connected to the output of the standby power supply through a current limiting resistor.

Preferably, a pull-up resistor is connected between the gate and the source of the PMOS transistor for switching, an output current-limiting resistor is provided between the drain and the standby power supply, and a non-return diode is provided between the output pin of the voltage stabilizing chip and the source of the PMOS transistor for switching.

The utility model has the advantages that: due to the arrangement of the GPRS power supply control circuit, the GPRS power supply output (generally 5V direct current input) of the collecting unit supplies power to the GPRS module through the GPRS power supply control circuit, the GPRS power supply control circuit can be switched on or switched off under the control of an external signal, and the shutdown, the startup and the dormancy of the GPRS module can be realized according to the actual current/charging condition under the control of a single chip microcomputer of the collecting unit, so that the frequent restart of the collecting unit under the condition of insufficient power taking and power supply and the condition that the collecting unit cannot be connected with a master station server and cannot effectively charge a battery due to the frequent restart are avoided; because the reasonable connection with the corresponding pin of the collecting unit singlechip is realized, the working condition of the GPRS module can be controlled by utilizing the singlechip technology, the control capability of the original singlechip is fully utilized, the circuit can be prevented from being excessively complicated, and the cost, the operation cost and the maintenance cost are reduced.

Because the power supply circuit and the standby power supply are arranged, the power supply mode with higher voltage output can be automatically selected to supply power according to the voltage conditions of the two power supply modes through the arrangement of the power supply switching circuit, the power supply circuit is used for supplying power in a normal situation, when the power supply circuit cannot normally supply power due to some reason or the voltage output of the power supply circuit is lower than the voltage output (including zero output due to failure or maintenance) of the standby power supply, the standby power supply is automatically switched to supply power with the standby power supply, so that the continuity and reliability of power supply are ensured, and the standby power supply is only used as a standby in a special situation, thereby being beneficial to prolonging the service life of the standby power supply and reducing the maintenance cost; because the charging control circuit is arranged, when the voltage output of the standby power supply is lower than a set charging threshold (for example, 10.9V), the standby power supply is automatically charged through the output of the power taking circuit, and when the voltage output of the standby power supply is higher than the set charging threshold, the charging is automatically stopped, so that the standby power supply can be always in a good power supply state; the related power supply switching circuit and the charging control circuit have simple structures and reliable performance, and the used elements are suitable for the environmental conditions of the cable type fault indicator collected in multiple paths.

The utility model discloses can utilize the control fault indicator to collect the target that the operational mode of unit GPRS communication module reaches the whole consumption of reduction system under the support of singlechip to the charging of the prior stand-by power supply of guaranteeing when getting electric circuit electric current less, thereby improve fault indicator online rate.

Drawings

Figure 1 is a schematic diagram of a GPRS power supply control circuit;

FIG. 2 is a schematic diagram of a power switching circuit;

FIG. 3 is a schematic diagram of a charge control circuit;

fig. 4 is a block diagram of a basic configuration relating to a power supply unit and a sink unit;

fig. 5 is a circuit block diagram relating to a power supply unit and a sink unit;

FIG. 6 is a schematic diagram of a standby supply voltage (output) sampling circuit;

FIG. 7 is a schematic diagram of a voltage (output) sampling circuit for a power-taking circuit;

FIG. 8 is an architectural block diagram of an aggregation unit;

fig. 9 is a flowchart that can be used for one control method of the present invention.

Detailed Description

In order to clearly understand the objects, technical solutions and technical effects of the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are only exemplary and explanatory and do not constitute limitations to the implementation of the present invention.

Referring to fig. 4 and 5, the utility model provides a control GPRS mode promotes fault indicator of online rate and collects the unit and is equipped with power supply circuit (or call power module), power supply circuit is including getting electric circuit, stand-by power supply and power switching circuit, power switching circuit is equipped with two inputs and an output, and its two inputs are connected respectively and are got electric circuit's output and stand-by power supply, and its output forms supply voltage for connect the VCC incoming end that collects other power circuits (when suitable) in unit and the fault indicator. Therefore, the utility model discloses a collect the unit and have two kinds of power supply modes, can supply power through getting the electric circuit, also can supply power through stand-by power supply, collect the unit and be equipped with GPRS power supply output (be 5V direct current input usually) for insert GPRS control circuit, for the GPRS module power supply through GPRS control circuit, can set up required GPRS power supply output on the singlechip that collects the unit according to prior art.

The power taking circuit can adopt a Current Transformer (CT) for detecting line current as a power taking element, the current transformer usually adopts an open-type current transformer, the corresponding current transformer is arranged on a power transmission line, the output side (secondary coil) of the current transformer is connected to a CT power conversion circuit to form 14V or other direct current output of required voltage, and the direct current output is taken as the voltage output VCC of the power taking circuit.

The prior art can be adopted to integrate the CT power conversion circuit, the standby power supply and the power supply switching circuit into a power supply module.

The voltage output BAT of the backup power supply will drop with the use of the backup power supply or the release of electric energy, and can be charged after dropping to a certain extent.

In the background of the prior art, the backup power source may adopt one or more rechargeable batteries, and a plurality of rechargeable batteries constitute a rechargeable battery pack, and the rechargeable batteries in the rechargeable battery pack can be connected in series and/or in parallel according to battery characteristics and actual needs, and generally, a unified battery pack connection terminal (connection terminal) may be provided, and is connected to an external circuit (for example, a charging circuit or a power switching circuit) through the battery pack connection terminal, so as to output a voltage (in this case, it may be called as an output terminal of the backup power source), receive an external input during charging (in this case, it may be called as a charging terminal or a charging connection terminal of the backup power source), and so on.

The power supply switching circuit can switch the connection relation between two input ends and the output end of the power supply switching circuit, one input end is connected with the output end, the other input end is not connected with the output end, any circuit capable of realizing corresponding power supply switching can be adopted, the power supply switching mode is that the input end with higher voltage is communicated with the output end, the input end with lower voltage is disconnected with the output end, and when the voltage height relation of the two input ends is changed (the voltage of one input end is converted into the voltage of the other input end is higher), the power supply switching circuit automatically switches the on-off state between the two input ends and the output end.

Referring to fig. 2, the power switching circuit may be provided with two power switching diodes D15 and D16, anodes of the two power switching diodes are respectively connected (or respectively formed) with corresponding input terminals of the power switching circuit, and cathodes of the two power switching diodes are connected with each other to form or jointly connect with output terminals of the power switching circuit. Thus, when the voltage (VCC or BAT) on the positive side (or positive terminal) of one power switching diode is higher than the voltage (BAT or VCC) on the positive side of the other power switching diode, the power switching diode turns on itself and, at the same time, forms a higher voltage (higher than the voltage on the positive side) on the negative side (or negative terminal) of the other power switching diode, turning off the other power switching diode, whereby the output voltage VCC OUT of the power switching circuit matches the higher of the output voltage VCC of the power-taking circuit and the output voltage BAT of the backup power supply.

According to the characteristics of the diodes, when the voltages of the positive electrodes of the two power switching diodes are approximately similar, the two power switching diodes can be conducted, and proper diode selection can be adopted, so that the power taking circuit is preferentially adopted for supplying power under the condition.

The power supply switching control can be performed according to the following requirements: when the voltage output VCC of the power taking circuit is higher than the voltage BAT of the standby power supply, the output VCC of the power taking circuit is used as the voltage output VCC _ OUT of the power supply circuit; when the voltage output VCC of the power-taking circuit is lower than the voltage BAT of the standby power supply, the output BAT of the standby power supply is used as the voltage output VCC _ OUT of the power supply circuit.

Referring to fig. 5, a charging control circuit is arranged between the power taking circuit and the standby power supply, an input end (power supply access end) of the charging control circuit is connected to an output (VCC) of the power taking circuit, and an output end of the charging control circuit is connected to a charging end (terminal block, BAT) of the standby power supply.

The charging control circuit can adopt any circuit capable of realizing charging control, the charging control mode is that when the voltage of the standby power supply is lower than a certain value, the input end of the charging control circuit is communicated with the output end, so that the power taking circuit is allowed to charge the standby power supply, and when the voltage of the standby power supply is higher than a certain value (recovered to a normal state), the power supply access end of the charging control circuit is disconnected with the output end, so that the power taking circuit cannot charge the power supply.

Referring to fig. 3, the charging control circuit is provided with a voltage stabilizing circuit, a voltage detecting circuit, a control circuit and a switching circuit.

The voltage stabilizing circuit is provided with a voltage stabilizing chip U1, the output VCC of the power taking circuit is connected to an input pin (IN pin) of the voltage stabilizing chip U1, and the output pin (OUT pin) of the voltage stabilizing chip U1 leads OUT voltage output CHG OUT after voltage stabilization.

The voltage detection circuit is provided with a voltage detection chip U2, the output of the standby power supply is connected to an input pin (VIN pin) of the voltage detection chip U2, and when the output BAT of the standby power supply is lower than a corresponding set value (or the level of the input pin of the voltage detection chip U2 is lower than the corresponding set value), the output pin (VOUT pin) of the voltage detection chip U2 outputs high level.

The control circuit is provided with an NMOS (N-Metal-Oxide-Semiconductor) tube Q4 for control, the source electrode (S pole) of the NMOS tube Q4 for control is grounded, the output pin of the voltage detection chip U2 is connected with the grid electrode (G pole) of the NMOS tube Q4 for control, when the output pin of the voltage detection chip U2 outputs a high level, the NMOS tube Q4 for control is conducted, and when the output pin of the voltage detection chip U2 outputs a low level, the NMOS tube Q4 for control is cut off.

The switching circuit is provided with a PMOS (P-Metal-Oxide-Semiconductor) tube Q5 for a switch, the grid electrode of the PMOS tube Q5 for the switch is connected with the drain electrode (D pole) of the NMOS tube Q5 for control, when the NMOS tube Q4 for control is conducted, the PMOS tube Q5 for the switch is conducted, and when the NMOS tube Q4 for control is cut off, the PMOS tube Q5 for the switch is cut off.

The source electrode of the PMOS tube Q5 for the switch is connected with an output pin (OUT pin) of the voltage stabilizing chip U1, the drain electrode is connected with the standby power supply BAT, when the PMOS tube Q5 for the switch is switched on, the electricity taking circuit can charge the standby power supply, and when the PMOS tube Q5 for the switch is switched off, the electricity taking circuit cannot charge the standby power supply.

The specific circuit design and the selection of elements of the charge control circuit can be performed according to the conventional circuit design principle and the actual requirements, and fig. 3 shows a specific implementation manner. The same applies to other circuits, and a specific embodiment of the corresponding circuit is shown in the corresponding figure.

For example, the voltage regulation chip U1 is a chip of type LM317, the voltage detection chip U2 is a chip of type XC61CN3702MR-G, the NMOS transistor Q4 for control is a NMOS transistor of type 2N7002, and the PMOS transistor Q5 for switch is a PMOS transistor of type Si4435 DDY.

For another example, the voltage output BAT of the standby power supply is connected to a voltage regulation pin (adj. Pin) of the voltage regulation chip U1, and an external resistor R8 is arranged between the voltage regulation pin and the input pin of the voltage regulation chip U1.

For another example, the output BAT of the standby power supply is divided by the resistor voltage dividing circuit and then connected to the input pin (VIN pin) of the voltage detection chip U2, the resistor voltage dividing circuit is formed by connecting the first voltage dividing resistor R12 and the second voltage dividing resistor R13 in series, the outer end (end not connected to the second voltage dividing resistor) of the first voltage dividing resistor R12 is connected to the output end of the standby power supply, the outer end (end not connected to the first voltage dividing resistor) of the second voltage dividing resistor R13 is grounded, the connection point of the input pin of the voltage detection chip U2 on the resistor voltage dividing circuit is located between the first voltage dividing resistor R12 and the second voltage dividing resistor R13, the input pin of the voltage detection chip U2 is further grounded through the filter capacitor C10, and the ground pin (VSS pin) of the voltage detection chip is grounded. Therefore, the characteristics of the voltage detection chip can be adapted to through proper element selection, the input low level of the voltage detection chip is ensured under the condition that the output of the standby power supply is normal, the output high level of the voltage detection chip is output after the output voltage of the standby power supply is reduced to a certain degree, and the on-off of the NMOS tube Q4 for control can be controlled through the corresponding high level and the low level.

For another example, the gate of the control NMOS transistor Q4 is grounded through a zener diode D14, and is connected to the output BAT of the standby power supply through a current limiting resistor R10.

For another example, a pull-up resistor R9 is provided (connected) between the gate and the source of the PMOS transistor Q5 for switching, and an output current limiting resistor R11 is provided between the drain and the standby power BAT.

For another example, a non-return diode D12 is disposed between the output pin of the voltage regulator chip U1 and the source of the PMOS transistor Q5 for switching.

In the background of the prior art, the charging control can be performed according to the following parameters: when the standby power supply voltage BAT is lower than 10.9V, U2 outputs high level, Q4 is conducted, and then Q5 is controlled to be conducted, and CHOUT after VCC is stabilized charges the standby power supply.

Referring to fig. 5, the GPRS power supply control circuit is disposed between the single chip of the collection unit and the GPRS module, and the single chip of the collection unit can control the operating state thereof.

Referring to fig. 1, the GPRS power supply control circuit is provided with a switch chip (for example, a chip used as a single-channel load switch) U20, an input pin (VIN pin) of which is used for accessing a GPRS power supply output VCC 5 of the collecting unit, an output pin (VOUT pin) of which is used for connecting a power supply terminal GRPS VCC of the GPRS module, and a switch control pin (ON pin) of which is used for accessing a corresponding control output (control level) CTRL _ PW of the single chip microcomputer, and controls the ON-off state of the switch chip through the CTRL _ PW.

The specific circuit design and component selection of the GPRS power supply control circuit can be performed according to conventional circuit design principles and practical requirements, for example, fig. 1 shows a specific implementation manner.

In the embodiment shown in fig. 1, the switch chip is a chip of model number TPS22918, except for the connection method/application of the aforementioned pins, a fast output discharge pin (QOD) of the chip is connected to an output pin of the chip through a discharge resistor (QOD resistor) R111, a timing pin (CT pin) of the chip is grounded through a timing capacitor C49, and an input pin thereof is grounded through a pull-down resistor R123.

Referring to fig. 6 and 7, the standby power supply voltage (output) sampling circuit and the power taking circuit voltage (output) sampling circuit are respectively used for accessing the standby power supply voltage (output) and the power taking circuit voltage (output) to the single chip microcomputer, the input ends of the standby power supply voltage (output) sampling circuit and the power taking circuit voltage (output) sampling circuit are respectively accessed to the output BAT of the standby power supply and the output VCC of the power taking circuit (or the output VCC _ OUT of the power switching circuit), and the output ends VBA and VMPW are respectively accessed to the corresponding AD sampling measurement pins of the single chip microcomputer.

The standby power supply voltage (output) sampling circuit and the power taking circuit voltage (output) sampling circuit can be the same circuit so as to realize comparability of corresponding sampling data.

The standby power supply voltage (output) sampling circuit and the power taking circuit voltage (output) sampling circuit can adopt a voltage tracking circuit (or called voltage tracker), in particular to the same voltage tracker.

The voltage tracker used as a standby power supply voltage (output) sampling circuit and a power taking circuit voltage (output) sampling circuit is provided with an operational amplifier chip U12A or U12B, BAT and VCC (or VCC _ OUT) are connected to the forward end of the operational amplifier chip after being divided by a resistor divider, and the reverse end of the operational amplifier chip is connected with the output end of the operational amplifier chip through a feedback resistor R87 or R95.

The voltage dividing resistor is composed of a first resistor R94 (or R88) and a second resistor R93 (or R96) which are connected in series, wherein the outer end (not connected with the second resistor end) of the first resistor R94 (or R88) is connected with BAT or VCC (or VCC _ OUT), the outer end (not connected with the first resistor end) of the second resistor R93 (or R96) is grounded, and the forward end of the operational amplifier chip is connected between the first resistor R94 (or R88) and the second resistor R93 (or R96) in the voltage dividing resistor.

Referring to fig. 4, the collecting unit and the power supply unit of the fault indicator include a current transformer, a standby power supply, a power supply module, a GPRS module, an optical fiber receiving module, and a single chip microcomputer.

The power supply module comprises a power supply conversion circuit, a power supply switching circuit and a charging control circuit. The current transformer obtains electricity on a circuit, outputs the electricity from the secondary winding, converts the electricity into 14V direct current voltage through the power conversion circuit, and supplies power for the collecting unit of the fault indicator and other circuits (when appropriate). Through the power supply switching circuit, when the power supply voltage (hereinafter referred to as line power supply voltage) obtained and converted by the current transformer is reduced to be insufficient for the collection unit to work, the standby power supply is automatically switched to supply power to the collection unit. Through the charging control circuit, when the standby power supply voltage is low, the standby power supply is charged by using the line power-taking voltage.

The GPRS module is used for communicating with the master station server and transmitting information such as remote signaling and remote measuring. The serial port communication interface of the GPRS module is connected with the serial port of the single chip microcomputer of the collecting unit (see figure 1), and the single chip microcomputer is also connected with a starting control pin and a dormancy awakening control pin of the GPRS module through an IO pin (see figure 4).

The optical fiber receiving module is used for communicating with the acquisition unit of the fault indicator, receiving the line state data acquired by the acquisition unit and acquiring the line data so as to monitor the line condition in real time, and the prior art can be adopted.

When the current of the power line is low, the power supply (voltage) obtained and converted by the current transformer cannot supply the collecting unit to work, the current transformer is automatically switched to the standby power supply to supply power, and when the electric quantity of the standby power supply is used up (insufficient), the collecting unit cannot work normally. If the line power-taking voltage is normal at this time, but the power is not enough to support the collection unit to be connected with the master station server, the line power-taking voltage is lowered due to the high requirement on the power supply power in the starting process of the GPRS module, and the collection unit is shut down. Then, the line power-taking voltage rises, the collection unit is started, the GPRS module is restarted, the collection unit is frequently restarted, and if the collection unit is not controlled or changed, the collection unit can not be connected with a master station server or can not charge a battery. Therefore, the situation can be detected by the single chip microcomputer of the existing collecting unit, the GPRS module is not opened under the control of the single chip microcomputer after the computer is started, power consumption is reduced, the GPRS module is opened after the battery is charged for a period of time, and the GPRS module is connected with the master station server, so that the online rate of the fault indicator is improved. Meanwhile, after the GPRS module is connected with the master station server, when the collection unit has no data transmission, the single chip microcomputer controls the GPRS module to sleep. Based on the prior art, the GPRS module can still have a receiving function in a dormant state, when data is received or sent, the GPRS module is awakened to communicate with the master station server, and the control mode not only reduces power consumption to the maximum extent, but also keeps the fault indicator on line in real time.

The GPRS module communication chip can be an ME3630 chip, is in serial port connection with the single chip microcomputer through a serial port communication interface to carry out communication, is in communication with the master station server to transmit information such as remote signaling and remote measuring, and is connected with the GPRS module startup control pin and the dormancy awakening control pin through an IO pin to control the working state of the GPRS module to be switched among shutdown, transmission and dormancy.

When the GPRS module is in dormancy, the power is only 7mW; when the GPRS module is started, the requirement on power supply power is high, if the power supply power is insufficient, the GPRS module pulls down the power supply voltage when being started, and the indicator is turned off.

The power supply circuit can work under the support of a single chip microcomputer and the like of the collection unit, under the condition that the circuit current is small, if the single chip microcomputer detects that the power supply circuit is frequently restarted for 3 times, the GPRS module is not started any more after the power supply circuit charges the battery, the single chip microcomputer controls a starting pin to generate a low level of 200 milliseconds after the battery is charged for one hour, and the GPRS module is started to be connected with the master station server. Under the condition of connecting the master station server, if the collecting unit has no data transmission, the single chip microcomputer controls the dormancy control pin to be changed from a high level to a low level, the GPRS module is dormant, the GPRS module still has a receiving function in a dormant state, when the received data or the data is sent, the single chip microcomputer controls the dormancy control pin to be changed from the low level to the high level, the GPRS module is awakened to communicate with the master station server, therefore, the power consumption is reduced to the maximum degree, the fault indicator is kept on line in real time, and the working flow during use can be seen in fig. 9.

Referring to fig. 8, the collection unit includes a collection unit single chip microcomputer, and a GPRS module, an optical fiber receiving module, a clock module, a storage module, and an encryption module connected to the single chip microcomputer, where the single chip microcomputer is connected to the GPRS module through a serial port to control the GPRS module to communicate with a master station server of a power grid (power supply office) and transmit information such as remote signaling and remote sensing, and the single chip microcomputer is further connected to a GPRS module power-on control pin and a sleep wake-up control pin through an IO pin to control the working state of the GPRS module to switch between power-off, transmission, and sleep; output terminals VBA and VMPW of the standby power supply voltage (output) sampling circuit and the power taking circuit voltage (output) sampling circuit are respectively connected to corresponding AD sampling measurement pins of the single chip microcomputer, so that the single chip microcomputer can sample the standby power supply voltage output and the power taking circuit voltage output, judge the states (output voltages) of the power taking circuit and the standby power supply and further perform corresponding control based on the state data (output terminal voltage data); the collecting unit receives data sent by the collecting unit module through the optical fiber receiving module by utilizing the time-sharing sampling analog serial port, and can simultaneously receive data collected by 12 lines according to the use condition.

As an example, the model of the single chip microcomputer of the collection unit is LPC51U68JBD64; the GPRS module is ME3630-W; the clock module model is RX8025T; the model of the storage module is GD25Q64CSIG; the encryption module model is SC1161Y. The clock module is connected with the single chip microcomputer of the collecting unit through an I2C interface, so that the accurate time of the fault indicator system is maintained; the storage module is connected with the single collecting unit chip through an SPI (serial peripheral interface) interface and stores data such as fault events, logs and the like of the fault indicator system; the single chip microcomputer of the collecting unit is connected with the encryption module through the SPI interface, and data can be encrypted and decrypted through the encryption module, so that encrypted communication with the master station server is achieved, and data safety is guaranteed.

The utility model discloses can work under the singlechip support that collects the unit, have following characteristics:

1) When the current of the power-taking line is insufficient to support the communication between the fault indicator and the master station server, the fault indicator is connected with the master station server at intervals, and the online rate is improved;

2) The power consumption is reduced to the maximum extent and the fault indicator is kept on line in real time.

The preferred and optional technical means disclosed in the present invention can be combined arbitrarily to form a plurality of different technical solutions, except for the specific description and the further limitation that one preferred or optional technical means is another technical means.

Claims (10)

1. The utility model provides a control GPRS mode promotes fault indicator of online rate and collects unit, includes collects the unit, it is equipped with the GRPS module to collect the unit, its characterized in that collect the unit and still be equipped with GPRS power supply control circuit, GPRS power supply control circuit's power input end is connected the GPRS power supply output who collects the unit, and power output end connects the power input end of GPRS module, GPRS power supply control circuit is equipped with switch chip, switch chip is equipped with the on-off control pin that is used for connecting the corresponding control output of the singlechip that collects the unit.

2. The collecting unit of fault indicators for controlling GPRS operational mode to increase on-line rate as recited in claim 1, wherein said GPRS module has a power-on control pin and a sleep-wake-up control pin, said power-on control pin and said sleep-wake-up control pin of said GPRS module are respectively used for connecting to corresponding IO pins for control of the single chip of the collecting unit through a power-on control line and a sleep control line, thereby enabling power-on and sleep-down under the control of the single chip.

3. The collecting unit of fault indicators for controlling GPRS operational mode boost on-line rates as recited in claim 1, wherein said switch chip is a single channel load switch of model number TPS 22918.

4. The collecting unit of fault indicators for controlling GPRS operational modes with increased on-line rates as claimed in claim 1, wherein said GPRS module is a GPRS module model ME 3630-W.

5. The collecting unit of fault indicators for controlling GPRS operational mode with increased on-line rate as claimed in any of claims 1-4, wherein said collecting unit is provided with a power circuit comprising a power-taking circuit, a standby power supply and a power switching circuit, said power switching circuit having two inputs and an output, wherein said two inputs are connected to said output of said power-taking circuit and said standby power supply, respectively, and said output is the power output of said power circuit.

6. The collecting unit of fault indicators for controlling GPRS operational mode with increased on-line rate as recited in claim 5, wherein said backup power source comprises one or more rechargeable batteries, and a plurality of rechargeable batteries form a rechargeable battery pack.

7. The collecting unit as claimed in claim 5, wherein the power switching circuit has two power switching diodes, anodes of the two power switching diodes are respectively connected to corresponding input terminals of the power switching circuit, and cathodes of the two power switching diodes are both connected to the output terminal of the power switching circuit.

8. The collecting unit as claimed in claim 5, wherein a charging control circuit is disposed between the power-taking circuit and the standby power supply, and has an input terminal connected to the output terminal of the power-taking circuit and an output terminal connected to the standby power supply.

9. The collecting unit as claimed in claim 8, wherein the charge control circuit comprises a voltage regulator circuit, a voltage detector circuit, a control circuit and a switch circuit.

10. The collecting unit as claimed in claim 9, wherein the voltage regulator circuit has a voltage regulator chip, the voltage detector circuit has a voltage detector chip, the control circuit has an NMOS transistor for control, and the switch circuit has a PMOS transistor for switch.

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