CN221151363U - Communication module circuit, power-down reporting system and equipment - Google Patents

Abstract

The utility model provides a communication module circuit, a power failure reporting system and equipment, wherein the communication module circuit comprises a power input, a reset input, a DC-DC module, a charging capacitor, a first switch piece, a second switch piece, a third switch piece and a communication chip; the power input is respectively connected with the DC-DC module and the second switch piece; the DC-DC module and the second switch piece are respectively connected with the communication chip; the charging capacitor is respectively connected with the second switch piece and the first switch piece; the first switch piece is respectively connected with the reset input and the communication chip; the third switch element is connected to the reset input and the DC-DC module, respectively. The utility model can ensure the normal work and normal reset control of the equipment when the equipment is not powered down, and report the power down state in time after the power down.

Description

Communication module circuit, power-down reporting system and equipment

Technical Field

The utility model relates to the field of communication modules, in particular to a communication module circuit, a power failure reporting system and equipment.

Background

Some new standards of the current instrument industry need to add a power failure reporting function, namely, after the power failure of the instruments such as an ammeter, a water meter, a gas meter, a heat meter and the like, the power failure event needs to be pushed to the concentrator. The existing mode is to connect a Farad capacitor in parallel with the power supply of the wireless module. However, direct parallel coupling brings additional problems, and common ones are: 1. the instantaneous charging current of the Farad capacitor is relatively large, and if the load capacity of the power supply design is insufficient, the voltage is pulled down; 2. the Faraday capacitor can often maintain the electric quantity for a period of time after power failure, and a general wireless communication module can use a power-off reset mechanism to solve the abnormal state of the module, and the existence of the Faraday capacitor can cause the power-off reset mechanism to wait for a long time or to be directly disabled; 3. the power failure of the faraday capacitor to near the lowest operating voltage of the IC can result in the IC being in a critical operating state, repeatedly restarting, causing unstable or even damage to the operation.

Disclosure of utility model

The technical problems to be solved by the utility model are as follows: the communication module circuit, the power-down reporting system and the equipment are provided, normal operation and normal reset control of the equipment can be ensured when the equipment is not powered down, and the power-down state is reported in time after the power is turned down.

In order to solve the technical problems, the first technical scheme adopted by the utility model is as follows:

A communication module circuit comprises a power supply input, a reset input, a DC-DC module, a charging capacitor, a first switch piece, a second switch piece, a third switch piece and a communication chip; the power input is respectively connected with the DC-DC module and the second switch piece; the DC-DC module and the second switch piece are respectively connected with the communication chip; the charging capacitor is respectively connected with the second switch piece and the first switch piece; the first switch piece is respectively connected with the reset input and the communication chip; the third switch element is connected to the reset input and the DC-DC module, respectively.

Optionally, the charging capacitor is a faraday capacitor.

Optionally, the first switch element, the second switch element and the third switch element are MOS transistors or triodes.

Optionally, the first switch element is an N-channel MOS transistor.

Optionally, the second switch element is a P-channel MOS transistor.

Optionally, the DC-DC module includes a chip U1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a resistor R1, a resistor R2, and an inductor L1;

The EN pin of the chip is connected with the third switch piece; the VIN pin of the chip U1 is connected with a power input; after the capacitor C5 and the capacitor C6 are connected in parallel, one end of the capacitor C5 is connected with the VIN pin of the chip U1, and the other end of the capacitor C6 is connected with the GND pin of the chip U1; the BST pin of the chip U1 is connected with the capacitor C1 and the inductor L1 in sequence; after the capacitor C2, the capacitor C3 and the capacitor C4 are connected in parallel, one end of the capacitor C2 is connected with the output end of the inductor L1, and the other end of the capacitor C3 is connected with the GND pin; two ends of the resistor R1 are respectively connected with the output end of the inductor L1 and the FB pin of the chip U1; and two ends of the resistor R2 are respectively connected with the FB pin and the GND pin of the chip U1.

Optionally, the circuit further comprises a diode D1, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10; the first switch piece is a MOS tube Q1; the first switch piece is a MOS tube Q2; the third switch piece is a triode Q3;

The reset input is connected with the grid electrode of the MOS tube Q1 through the resistor R3; two ends of the resistor R4 are respectively connected with the grid electrode of the MOS tube Q1 and the grounding end; the source electrode of the MOS tube Q1 is divided into two paths, one path is connected to the output end of the DC-DC module through the diode D1, and the other path is respectively connected with the drain electrode of the MOS tube Q2 and one end of the resistor R5; the other end of the resistor R5 is grounded; the drain electrode of the MOS tube Q1 is respectively connected with one end of the resistor R6 and the source electrode of the MOS tube Q2; the other end of the resistor R6 is connected with the anode of the charging capacitor; the negative electrode of the charging capacitor is grounded; the grid electrode of the MOS tube Q2 is connected to the power input through the resistor R7 and grounded through the resistor R8 respectively; the collector of the triode Q3 is connected with the resistor R8, the base of the triode Q is connected with the reset input through the resistor R9, and the emitter of the triode Q is respectively connected with the DC-DC module and grounded through the resistor R10.

The second technical scheme adopted by the utility model is as follows:

a power-down reporting system comprises the communication module circuit.

Optionally, the system also comprises a civil metering device; the civil metering instrument is in circuit connection with the communication module; the communication module circuit is an RF communication module.

The third technical scheme adopted by the utility model is as follows:

a power failure reporting device is in circuit connection with the communication module.

The utility model has the beneficial effects that: the communication module circuit provided by the utility model can realize three working modes: a power-on normal operation mode, a power-on normal reset mode and a power-off electric quantity maintenance mode. Therefore, the charging capacitor does not work when the equipment is not powered down, and the charging capacitor works after the equipment is powered down to provide enough power down reporting time for the communication module. Therefore, the utility model can effectively avoid the problem of failure of power-off reset control of the equipment on the communication module due to the continuous power supply of the charging capacitor by reasonably controlling the switching of different states of the charging capacitor; in addition, as the charging capacitor only supplies power for the communication system, the endurance of the charging capacitor can be improved; furthermore, the utility model realizes the required function by using a low-cost analog circuit switching scheme; finally, the utility model reasonably multiplexes the control signals and utilizes the voltage drop of the equipment power supply to realize the on-off of the switch circuit without complex software control, thereby leading the control logic to be simpler.

Drawings

Fig. 1 is a schematic diagram showing the composition and connection of a communication module circuit according to the present utility model;

Fig. 2 is a schematic diagram showing a circuit configuration of a DC-DC module in a communication module circuit according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram illustrating the control of the communication module circuit in a power-on normal operation mode according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram illustrating a circuit control of a communication module circuit in a power-on normal reset mode according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram illustrating a circuit control of a communication module circuit in a power down power maintenance mode according to an embodiment of the present utility model;

Fig. 6 is a system block diagram illustrating a case where a device in the power-down reporting system is an ammeter according to this embodiment.

Description of the reference numerals:

1. A power supply input; 2. a reset input; 3. a DC-DC module; 4. a charging capacitor;

5. and a communication chip.

Detailed Description

In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic diagram showing the composition and connection of a communication module circuit according to the present utility model. As shown in fig. 1, the communication module circuit proposed in the present embodiment includes a power input 1, a reset input 2, a DC-DC module 3, a charging capacitor 4, a first switching element Q1, a second switching element Q2, a third switching element Q3, and a communication chip 5. The power input 1 is respectively connected with the DC-DC module 3 and the second switch piece Q2; the DC-DC module 3 and the second switch element Q2 are respectively connected with the communication chip 5; the charging capacitor 4 is respectively connected with the second switch element Q2 and the first switch element Q1; the first switch element Q1 is respectively connected with the reset input 2 and the communication chip 5; the third switching element Q3 is connected to the reset input 2 and the DC-DC module 3, respectively.

The working principle of the communication module circuit in this embodiment is as follows:

In the normal power-on working mode, the first switch piece Q1 and the third switch piece Q3 are conducted, and the second switch piece Q2 is closed; the charging capacitor does not work, and the DC-DC module enables to be opened for supplying power to the communication module and simultaneously charges the charging capacitor;

In the normal reset mode of power on, the first switch piece Q1, the second switch piece Q2 and the third switch piece Q3 are all closed; the charging capacitor does not work, the DC-DC module is enabled to be closed, the loop of the charging capacitor is cut off, and the communication module is powered off and reset;

In the power-down electric quantity maintaining mode, the first switch piece Q1 and the third switch piece Q3 are closed, and the second switch piece Q2 is conducted; the charging capacitor works, the DC-DC module does not work, and the charging capacitor supplies power to the communication module, so that the communication module has enough time to complete power failure reporting.

The communication module provided by the embodiment can ensure that the charging capacitor does not work when the equipment is not powered down, and the equipment can normally realize power-off reset control of the communication module; after the equipment is powered down, the charging capacitor works to supply power for the communication module, and the power-down state of the equipment is reported to the concentrator.

In this embodiment, optionally, the charging capacitor is a faraday capacitor.

Optionally, the first switching element Q1, the second switching element Q2, and the third switching element Q3 are MOS transistors or triodes or other components with a switching function.

In the following, a specific embodiment will be taken as an example, to describe in detail the circuit composition and connection relationship of the DC-DC module in the communication module circuit.

Referring to fig. 2, fig. 2 is a schematic circuit diagram illustrating a DC-DC module in a communication module circuit according to an embodiment of the utility model. As shown in fig. 2, in this embodiment, the DC-DC module in the embodiment of fig. 1 includes a chip U1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a resistor R1, a resistor R2, and an inductor L1. The chip U1 includes VIN pin, BST pin, EN pin, SW pin, FB pin and GND pin.

The EN pin of the chip is connected with the third switch piece Q3; the VIN pin of the chip U1 is connected with a power input 12V; the capacitor C5 and the capacitor C6 are respectively connected in parallel between the VIN pin and the GND pin of the chip U1; the BST pin of the chip U1 is connected with the capacitor C1 and the inductor L1 in sequence; the capacitor C2, the capacitor C3 and the capacitor C4 are respectively connected in parallel between the output end of the inductor L1 and the GND pin; two ends of the resistor R1 are respectively connected with the output end of the inductor L1 and the FB pin of the chip U1; two ends of the resistor R2 are respectively connected with the FB pin and the GND pin; the SW pin is connected between the capacitor C1 and the inductor L1.

The DC-DC module has the following functions in a communication module circuit: the device supplies power to the communication chip of the communication module before power failure. The output voltage is adjustable, in this embodiment, the output is 4V, the matched resistor is configured as r1=39.9k, r2=10k, and the specific matching calculation formula is: r2=r1/4; the output of the switch element is controllable, and when the EN pin is larger than 1.8V, the third switch element Q3 connected with the EN pin is enabled to be turned on; with Iout max=0.6a.

Optionally, the type of the DC-DC module is MP2457, and the DC-DC module has characteristics of meeting 0.1% of output voltage ripple requirement, efficiency >90%, and fixed switching frequency of 2 MHz.

The working principle of the DC-DC module is as follows:

The DC-DC module enables a pin number 4 (EN pin) to be multiplexed with an ammeter control reset pin (RST pin), when the ammeter needs to enable the RF communication module to work, the RST pin (namely the EN pin) is set to be 3.3V and is 1.8V larger than the EN pin enabling threshold voltage, the DC-DC module starts to work, and 4V direct current voltage is output. If the ammeter needs a reset module, the RST pin (namely the EN pin) is set to be 0V and smaller than the EN pin enabling threshold voltage of 1.8V, the DC-DC module stops working, the output voltage is 0V, and the RF communication module is powered down. The RST pin (namely the EN pin) is set low for 2 seconds and then is set high to 3.3V again, and the DC-DC module starts to work to supply power for the RF communication module, so that the reset operation of the RF communication module is completed. The capacitors C5 and C6 are front-end filter capacitors of the DC-DC module, which is beneficial to reducing front-end input voltage ripples; the capacitors C2, C3 and C4 are rear-end filter capacitors of the DC-DC module, so that the reduction of rear-end output voltage ripples is facilitated; the resistors R1 and R2 are used for adjusting the feedback voltage of the DC-DC module so as to change the output voltage of the rear end; the capacitor C1 is used for coupling a 1 (BST) bootstrap pin and a 6 (SW) switch output pin; l1 is the freewheeling inductance for converting the switching PWM waveform output to a dc output.

Fig. 3 to 5 are schematic circuit control diagrams respectively showing three modes of the communication module circuit according to the embodiment of the utility model. In this embodiment, the circuit principle of the embodiment of fig. 1, which respectively operates in the power-on normal operation mode, the power-on normal reset mode, and the power-down power maintenance mode, will be described in detail with reference to a possible specific circuit configuration.

As shown in fig. 3 to 5, in this embodiment, the first switching element Q1 is an N-channel MOS transistor; the second switch piece Q2 is a P-channel MOS tube; the third switch Q3 is a triode Q3. In addition, the communication module circuit further comprises a diode D1, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10. Specifically, the reset input RST is connected to the gate of the MOS transistor Q1 via the resistor R3; two ends of the resistor R4 are respectively connected with the grid electrode of the MOS tube Q1 and the grounding end; the source electrode of the MOS tube Q1 is divided into two paths, one path is connected to the output end of the DC-DC module through the diode D1, and the other path is respectively connected with the drain electrode of the MOS tube Q2 and one end of the resistor R5; the other end of the resistor R5 is grounded; the drain electrode of the MOS tube Q1 is respectively connected with one end of the resistor R6 and the source electrode of the MOS tube Q2; the other end of the resistor R6 is connected with the positive electrode of the charging capacitor C7; the negative electrode of the charging capacitor C7 is grounded; the grid electrode of the MOS tube Q2 is respectively connected to the power input 12V through the resistor R7 and grounded through the resistor R8; the collector of the triode Q3 is connected with the resistor R8, the base thereof is connected with the reset input RST through the resistor R9, and the emitter thereof is respectively connected with the EN pin of the chip U1 of the DC-DC module and grounded through the resistor R10.

Based on the above circuit structure, as shown in fig. 3, the working principle of the communication module circuit in the power-on normal working mode is as follows: during normal power-on, equipment (such as a civil metering device) provides a 12V power supply for a communication module (such as an RF module), maintains a high level of a RST signal (reset signal), conducts an NPN triode Q3, enables the chip U1 to work normally due to the high level of an EN pin of the chip U1 in the DC-DC module, and provides power supply for a communication system, namely an RF system; meanwhile, when the RST signal is high, the NPN MOS transistor Q1 Vg is high, the I Vgs I > Vgs (th) I, the NPN MOS transistor Q1 is conducted, and the Faraday capacitor C7 is charged; PNP MOS transistor Q2 Vg high level (maintained by front end 12V power supply voltage division), |Vgs| < |Vgs (th) |, PNP MOS transistor Q2 is turned off.

As shown in fig. 4, the working principle of the communication module circuit in the power-on normal reset mode is as follows: the equipment (such as a civil metering device) provides 12V power for the communication module (such as an RF module) during normal power-on; when some expected failure of the communication module occurs, the RF system needs to be reset for restarting. At this time, the RST signal is low, the NPN triode Q3 is high in resistance state, the EN pin of the chip U1 in the DC-DC module is low, the enabling chip U1 is turned off, and the communication chip, namely the RF system power supply, is cut off. Meanwhile, when the RST signal is at a low level, the NPN MOS transistor Q1 Vg is at a low level, |Vgs| < |Vgs (th) |, and the NPN MOS transistor Q1 is turned off; PNP MOS transistor Q2 Vg high level (maintained by front end 12V power supply voltage division), |Vgs| < |Vgs (th) |, PNP MOS transistor Q2 is turned off; under the condition that the NPN MOS tube Q1 and the PNP MOS tube Q2 are closed, the Faraday capacitor C7 cannot supply power to the communication chip, namely the RF system, and is in an electric quantity maintaining state, and the communication system is powered down and reset.

As shown in fig. 5, the working principle of the communication module circuit in the power failure power maintenance mode is as follows: after the equipment (such as civil metering instrument) is powered down, 12V power supply and RST signal control can not be provided for the communication module (such as the RF module). At the moment, the chip U1 in the DC-DC module stops working, and the power supply of the communication module is cut off; meanwhile, the NPN MOS transistor Q1 Vg is at a low level, |Vgs| < |Vgs (th) |, and the NPN MOS transistor Q1 is turned off; PNP MOS transistor Q2 Vg low level (front end 12V has been powered down), |Vgs| > |Vgs (th) |, PNP MOS transistor Q2 is conducted; the faraday capacitor C7 powers the communication module, and because of the diode D1, the faraday capacitor C7 does not power circuits other than the communication module, and remains for a long period of time, during which the communication module is sufficient to upload current power down conditions and frozen data to the concentrator.

Referring to fig. 6, fig. 6 is a system block diagram illustrating a case where a device in the power-down reporting system is an ammeter according to the present embodiment. The embodiment of the utility model also provides a power-down reporting system, which comprises the communication module circuit in any embodiment. The specific structure of the communication module circuit is not repeated here, and for details, reference is made to the description of the above embodiments.

The power failure reporting system of the embodiment further comprises equipment which is connected with the communication module circuit and provides power for the communication module circuit.

In some embodiments, the device may be a domestic meter, such as a public water meter, electricity meter, gas meter, heat meter. As shown in fig. 6, fig. 6 is a schematic diagram showing the system components and connections of the power failure reporting system when the device is an ammeter.

In some embodiments, the communication module circuit is an RF communication module.

According to the power-down reporting system provided by the embodiment, when the metering device is not powered down, the charging capacitor does not work, and the metering device can normally realize power-down reset control of the RF communication module; after the metering device is powered down, the charging capacitor works to supply power for the RF communication module, and the power-down state of the ammeter is reported to the concentrator.

The utility model also provides a power failure reporting device, which is in circuit connection with the communication module in any embodiment. The specific structure of the communication module circuit is not repeated here, and for details, reference is made to the description of the above embodiments.

In some embodiments, the device may be a domestic meter, such as a public water meter, electricity meter, gas meter, heat meter. As shown in fig. 6, fig. 6 is a circuit diagram showing connection to the RF communication module when the device is an electricity meter.

The device provided by the embodiment, such as an ammeter, when the ammeter is not powered down, the charging capacitor does not work, and the ammeter can normally realize power-off reset control of the RF communication module; after the ammeter is powered off, the charging capacitor works to supply power for the RF communication module, and the ammeter power-off state is reported to the concentrator.

In summary, the communication module circuit, the power-down reporting system and the device provided by the utility model have the following advantages:

1. The switching of different states of the Faraday capacitor is reasonably controlled, so that the failure of a power-off reset control mechanism of the communication module by the metering instrument caused by the continuous electricity of the Faraday capacitor is avoided; the Faraday capacitor only supplies power to the communication module, so that the cruising time of the Faraday capacitor is increased;

2. An analog circuit switching scheme is adopted, so that a demand function is realized in a low-cost mode;

3. The control signals are reasonably multiplexed, and the switching circuit is switched on and off by utilizing the voltage drop of the power supply of the metering device, so that complex software control is not needed, and the control logic is simpler.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.

Claims (10)

1. The communication module circuit is characterized by comprising a power supply input, a reset input, a DC-DC module, a charging capacitor, a first switch piece, a second switch piece, a third switch piece and a communication chip; the power input is respectively connected with the DC-DC module and the second switch piece; the DC-DC module and the second switch piece are respectively connected with the communication chip; the charging capacitor is respectively connected with the second switch piece and the first switch piece; the first switch piece is respectively connected with the reset input and the communication chip; the third switch element is connected to the reset input and the DC-DC module, respectively.

2. The communication module circuit of claim 1, wherein the charging capacitance is a faraday capacitance.

3. The communication module circuit of claim 1, wherein the first switch, the second switch, and the third switch are MOS transistors or transistors.

4. The communication module circuit of claim 3 wherein the first switch element is an N-channel MOS transistor.

5. The communication module circuit of claim 3 wherein the second switch element is a P-channel MOS transistor.

6. The communication module circuit of claim 1, wherein the DC-DC module comprises a chip U1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a resistor R1, a resistor R2, an inductor L1;

The EN pin of the chip is connected with the third switch piece; the VIN pin of the chip U1 is connected with a power input; after the capacitor C5 and the capacitor C6 are connected in parallel, one end of the capacitor C5 is connected with the VIN pin of the chip U1, and the other end of the capacitor C6 is connected with the GND pin of the chip U1; the BST pin of the chip U1 is connected with the capacitor C1 and the inductor L1 in sequence; after the capacitor C2, the capacitor C3 and the capacitor C4 are connected in parallel, one end of the capacitor C2 is connected with the output end of the inductor L1, and the other end of the capacitor C3 is connected with the GND pin; two ends of the resistor R1 are respectively connected with the output end of the inductor L1 and the FB pin of the chip U1; and two ends of the resistor R2 are respectively connected with the FB pin and the GND pin of the chip U1.

7. The communication module circuit of claim 1, further comprising a diode D1, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, and a resistor R10; the first switch piece is a MOS tube Q1; the first switch piece is a MOS tube Q2; the third switch piece is a triode Q3;

The reset input is connected with the grid electrode of the MOS tube Q1 through the resistor R3; two ends of the resistor R4 are respectively connected with the grid electrode of the MOS tube Q1 and the grounding end; the source electrode of the MOS tube Q1 is divided into two paths, one path is connected to the output end of the DC-DC module through the diode D1, and the other path is respectively connected with the drain electrode of the MOS tube Q2 and one end of the resistor R5; the other end of the resistor R5 is grounded; the drain electrode of the MOS tube Q1 is respectively connected with one end of the resistor R6 and the source electrode of the MOS tube Q2; the other end of the resistor R6 is connected with the anode of the charging capacitor; the negative electrode of the charging capacitor is grounded; the grid electrode of the MOS tube Q2 is connected to the power input through the resistor R7 and grounded through the resistor R8 respectively; the collector of the triode Q3 is connected with the resistor R8, the base of the triode Q is connected with the reset input through the resistor R9, and the emitter of the triode Q is respectively connected with the DC-DC module and grounded through the resistor R10.

8. A power down reporting system comprising a communication module circuit as claimed in any one of claims 1 to 7.

9. The power down reporting system as in claim 8, further comprising a civil metering device; the civil metering instrument is in circuit connection with the communication module; the communication module circuit is an RF communication module.

10. A power down reporting device, characterized in that the device is in circuit connection with a communication module according to any of the preceding claims 1 to 7.