Power supply circuit and power line carrier communication module

Abstract

The utility model discloses a power supply circuit and a power line carrier communication module, and relates to the power line carrier communication and power supply technology field, the power supply circuit comprises a capacitor circuit and a boost circuit, the input end of the boost circuit is electrically connected with the discharge end of the capacitor circuit, and the output end of the boost circuit is electrically connected with the power supply input end; the input end of the step-down circuit is electrically connected with the power supply input end, and the output end of the step-down circuit is electrically connected with the charging end of the capacitor circuit; the detection end of the voltage detection circuit is electrically connected with the power supply input end, and the voltage detection circuit is used for detecting the voltage of the power supply input end; the signal receiving end of the control circuit is electrically connected with the output end of the voltage detection circuit, and the control end of the control circuit is electrically connected with the controlled end of the booster circuit; the control circuit, the booster circuit and the step-down circuit are all integrated in the same chip; the utility model aims to solve the problem that the size of the existing power supply circuit is large.

Description

Technical Field

[0001] The utility model relates to the technical field of power line carrier communication and power supply, in particular to a power supply circuit and a power line carrier communication module. Background Art

[0002] Power line carrier communication (PLC) is a unique communication method for power systems. It utilizes existing power lines to transmit analog or digital signals at high speed via carrier waves. Its key advantage is that data transmission can be carried out over any available power line, eliminating the need for a new network. Primarily used in remote meter reading systems, PLC is also finding widespread adoption in smart street lighting, industrial automation, and smart homes.

[0003] In China's power grid market, approximately 100 million power line carrier communication modules (including dual-mode) are tendered annually. State Grid Corporation of China and China Southern Power Grid require in their technical specifications that these modules include a power outage reporting function. This means that if the AC220V power line is lost, the module must report the outage to the master station. This requires the addition of a power supply circuit to the module. This circuit can quickly power the module during a power outage, enabling it to report the outage to the master station. Due to the large size of existing power supply circuits and the limited layout area for power line carrier communication modules, implementing a larger power supply circuit increases the difficulty of PCB design. In practical applications, if this larger power supply circuit is used in power line carrier communication modules with intelligent IoT meter modules and expanded functions such as topology, it will place higher demands on the module's hardware integration. Utility Model Content

[0004] The main purpose of the utility model is to provide a power supply circuit and a power line carrier communication module, aiming to solve the problem of large size of the existing power supply circuit.

[0005] To achieve the above-mentioned object, the present invention proposes a power supply circuit, which is applied to a power line carrier communication module. The power line carrier communication module includes a carrier chip, and is characterized in that the power supply circuit includes:

[0006] Power input terminal, used to connect to the power supply;

[0007] Capacitor circuit;

[0008] a boost circuit, wherein an input end of the boost circuit is electrically connected to a discharge end of the capacitor circuit;

[0009] a step-down circuit, wherein the input end of the step-down circuit is electrically connected to the power input end and the output end of the boost circuit respectively, and the output end of the step-down circuit is electrically connected to the charging end of the capacitor circuit and the power access end of the carrier chip respectively;

[0010] a voltage detection circuit, wherein a detection terminal of the voltage detection circuit is electrically connected to the power input terminal, and the voltage detection circuit is used to detect the voltage of the power input terminal;

[0011] a control circuit, wherein a signal receiving end of the control circuit is electrically connected to the output end of the voltage detection circuit, and a control end of the control circuit is electrically connected to the controlled end of the boost circuit;

[0012] The control circuit is used to control the boost circuit to operate when the voltage at the power input terminal is lower than a preset voltage;

[0013] The control circuit, the boost circuit and the buck circuit are all integrated in the same chip.

[0014] In one embodiment, the power supply circuit further includes:

[0015] a constant current source, wherein an input end of the constant current source is electrically connected to an output end of the step-down circuit, and an output end of the constant current source is electrically connected to a charging end of the capacitor circuit;

[0016] The constant current source, the control circuit, the boost circuit and the buck circuit are all integrated in the same chip.

[0017] In one embodiment, the boost circuit includes:

[0018] A first synchronous rectification circuit and a first inductor circuit, wherein the first synchronous rectification circuit includes a first switching tube, a second switching tube and a first driving circuit;

[0019] The output end of the second switching tube is electrically connected to the input end of the step-down circuit, the input end of the second switching tube is electrically connected to the input end of the first switching tube, the output end of the first switching tube is grounded, and the controlled end of the second switching tube and the controlled end of the first switching tube are both electrically connected to the control end of the first driving circuit;

[0020] The controlled end of the first driving circuit is electrically connected to the control end of the control circuit;

[0021] The first end of the first inductor circuit is electrically connected to the input end of the second switching tube and the input end of the first switching tube respectively;

[0022] The first synchronous rectification circuit, the step-down circuit and the control circuit are all integrated into the same chip.

[0023] In one embodiment, the power supply circuit further includes:

[0024] a first voltage divider circuit, wherein a first end of the first voltage divider circuit is electrically connected to an output end of the second switching tube;

[0025] The first driving circuit includes:

[0026] a first driving module, a first amplifier, and a first oscillating source, wherein the control end of the first driving module is electrically connected to the controlled end of the first switching tube and the controlled end of the second switching tube respectively; and the controlled end of the first driving module is electrically connected to the control end of the control circuit;

[0027] The first input end of the first amplifier is electrically connected to the second end of the first voltage divider circuit, the second input end of the first amplifier is electrically connected to the output end of the first oscillation source, and the output end of the first amplifier is electrically connected to the signal receiving end of the first driving module.

[0028] In one embodiment, the step-down circuit includes:

[0029] a second synchronous rectification circuit and a second inductor circuit, wherein the second synchronous rectification circuit includes a third switching tube, a fourth switching tube and a second driving circuit;

[0030] The input end of the third switch tube is electrically connected to the power input end and the output end of the boost circuit respectively, the output end of the third switch tube is electrically connected to the input end of the fourth switch tube, the output end of the fourth switch tube is grounded, and the controlled end of the third switch tube and the controlled end of the fourth switch tube are both electrically connected to the control end of the second drive circuit;

[0031] a second inductor circuit, wherein a first end of the second inductor circuit is electrically connected to the output end of the third switching tube, and a second end of the second inductor circuit is electrically connected to the power supply access end of the carrier chip and the charging end of the capacitor circuit respectively;

[0032] The second synchronous rectification circuit, the boost circuit and the control circuit are all integrated into the same chip.

[0033] In one embodiment, the power supply circuit further includes:

[0034] a second voltage divider circuit, wherein a first end of the second voltage divider circuit is electrically connected to a second end of the second inductor circuit;

[0035] The second driving circuit includes:

[0036] a second driving module, a second amplifier, and a second oscillation source;

[0037] The control end of the second driving module is electrically connected to the controlled end of the third switch tube and the controlled end of the fourth switch tube respectively;

[0038] The first input terminal of the second amplifier is electrically connected to the output terminal of the second oscillation source, the second input terminal of the second amplifier is electrically connected to the second terminal of the second voltage divider circuit, and the output terminal of the second amplifier is electrically connected to the signal receiving terminal circuit of the second driving module;

[0039] The second voltage divider circuit, the control circuit, the voltage boost circuit and the voltage step-down circuit are all integrated into the same chip.

[0040] In one embodiment, when the power supply circuit includes a first oscillation source and a second oscillation source, the first oscillation source and the second oscillation source are the same oscillation source, and an oscillation frequency of the oscillation source is less than 700 KHZ or greater than 12 MHZ.

[0041] In one embodiment, the first voltage divider circuit includes:

[0042] A first resistor and a second resistor, wherein the first end of the first resistor is electrically connected to the power input terminal, the second end of the first resistor is electrically connected to the first end of the second resistor, the first end of the second resistor is also electrically connected to the first input terminal of the first amplifier, and the second end of the second resistor is grounded.

[0043] In one embodiment, the voltage detection circuit includes:

[0044] a third resistor and a fourth resistor, wherein the first end of the third resistor is electrically connected to the power input end, the second end of the third resistor is electrically connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded; and the first end of the fourth resistor is electrically connected to the signal receiving end of the control circuit.

[0045] The present utility model also proposes a power line carrier communication module, characterized in that it includes a carrier chip and a power supply circuit as described in any one of the above items; wherein the input end of the power supply circuit is connected to the power supply, and the output end of the power supply circuit is electrically connected to the power supply access end of the carrier chip.

[0046] The technical solution of the present invention is to detect the voltage of the power input terminal by using a voltage detection circuit. When the power grid is out of power, the voltage of the power input terminal will drop. When the voltage of the power input terminal drops to a preset threshold, the control circuit controls the boost circuit to work, so that the boost circuit boosts the discharge voltage of the capacitor circuit and outputs it to the input terminal of the step-down circuit. The step-down circuit then steps down the received voltage and outputs it to the power access terminal of the carrier chip, thereby providing a short-term energy supply for the carrier chip, so that the carrier chip can report the power outage event to the main station in time after the power grid is out of power; when the power grid is normally powered, the step-down circuit steps down the voltage of the power input terminal and outputs it to the carrier chip and the capacitor circuit respectively, thereby charging the carrier chip and the capacitor circuit at the same time. With such a setting, in actual application, when the power grid is out of power, the discharge voltage of the capacitor circuit is converted by the boost circuit and the step-down circuit in turn and outputted to the carrier chip, thereby providing a short-term power supply for the carrier chip, ensuring the timely reporting of the power outage information. Moreover, the present invention integrates the boost circuit, the buck circuit and the control circuit into the same chip, and the package can be a small package such as SOP and DFN, which can effectively reduce the occupied area of ​​the power supply circuit of the present invention in the power line carrier communication module, thereby reducing the design difficulty of the power line carrier communication module PCB. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0048] Figure 1 This is a schematic diagram of a module according to an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of a module of another embodiment of the present utility model;

[0050] Figure 3 This is a schematic diagram of the circuit structure of an embodiment of the present utility model.

[0051] Description of Figure Numbers:

[0052] 10. Capacitor circuit; 20. Boost circuit; 21. First synchronous rectifier circuit; 22. First inductor circuit; 30. Buck circuit; 31. Second synchronous rectifier circuit; 32. Second inductor circuit; 40. Voltage detection circuit; 50. Control circuit; 60. Constant current source; 70. First voltage divider circuit; 80. Second voltage divider circuit.

[0053] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0055] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0056] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0057] Power line carrier communication (PLC) is a unique communication method for power systems. It utilizes existing power lines to transmit analog or digital signals at high speed via carrier waves. Its key advantage is that data transmission can be carried out over any available power line, eliminating the need for a new network. Primarily used in remote meter reading systems, PLC is also finding widespread adoption in smart street lighting, industrial automation, and smart homes.

[0058] In China's power grid market, approximately 100 million power line carrier communication modules (including dual-mode) are tendered annually. State Grid Corporation of China and China Southern Power Grid require in their technical specifications that these modules include a power outage reporting function. This means that if the AC220V power line is lost, the module must report the outage to the master station. This requires the addition of a power supply circuit to the module. This circuit can quickly power the module during a power outage, enabling it to report the outage to the master station. Due to the large size of existing power supply circuits and the limited layout area for power line carrier communication modules, implementing a larger power supply circuit increases the difficulty of PCB design. In practical applications, if this larger power supply circuit is used in power line carrier communication modules with intelligent IoT meter modules and expanded functions such as topology, it will place higher demands on the module's hardware integration.

[0059] Therefore, the main purpose of the present invention is to provide a power supply circuit and a power line carrier communication module, aiming to solve the problem of large size of the existing power supply circuit.

[0060] refer to Figure 1 A power supply circuit is applied to a power line carrier communication module, wherein the power line carrier communication module includes a carrier chip, and the power supply circuit includes:

[0061] Power input terminal, used to connect to the power supply;

[0062] Capacitor circuit 10;

[0063] a boost circuit 20, wherein the input end of the boost circuit 20 is electrically connected to the discharge end of the capacitor circuit 10, and the output end of the boost circuit 20 is electrically connected to the power input end;

[0064] A step-down circuit 30, wherein an input terminal VIN2 of the step-down circuit 30 is electrically connected to the power input terminal and the output terminal of the boost circuit 20, respectively, and an output terminal of the step-down circuit 30 is electrically connected to the charging terminal of the capacitor circuit 10 and the power access terminal of the carrier chip, respectively;

[0065] a voltage detection circuit 40, wherein a detection terminal of the voltage detection circuit 40 is electrically connected to the power input terminal, and the voltage detection circuit 40 is used to detect the voltage at the power input terminal;

[0066] a control circuit 50 , wherein a signal receiving end of the control circuit 50 is electrically connected to an output end of the voltage detection circuit 40 , and a control end of the control circuit 50 is electrically connected to a controlled end of the boost circuit 20 ;

[0067] The control circuit 50 is used to control the boost circuit 20 to operate when the voltage at the power input terminal is less than a preset voltage;

[0068] The control circuit 50 , the boost circuit 20 , and the buck circuit 30 are all integrated into the same chip.

[0069] In this embodiment, the voltage detection circuit 40 may be a Hall voltage sensor, a voltage transformer, or a resistive voltage divider sensor.

[0070] In this embodiment, the capacitor circuit 10 includes at least one capacitor. Figure 3 The capacitor circuit 10 includes a supercapacitor E1 and a second capacitor C2, wherein the step-down circuit 30 is used to charge the supercapacitor E1 when the power grid is operating normally, the boost circuit 20 is used to boost the discharge voltage of the supercapacitor E1 when the power grid is outage, and the second capacitor C2 is used to filter the discharge voltage of the supercapacitor E1.

[0071] In this embodiment, compared with the traditional discrete solution (the control circuit 50, the buck circuit 30 and the boost circuit 20 respectively use independent chips), the control circuit 50, the buck circuit 30 and the boost circuit 20 are integrated in the same chip, and the wafer area of ​​the chip can be made smaller than the sum of the three independent chip wafers of the discrete solution. In this way, not only the occupied area of ​​the power supply circuit can be reduced, but also the packaging and testing cost of the chip can be reduced.

[0072] Specifically, the technical solution of the present invention uses a voltage detection circuit 40 to detect the voltage at the power input end. When the power grid is out of power, the voltage at the power input end will drop. When the voltage at the power input end drops to a preset threshold value, the control circuit 50 controls the boost circuit 20 to work, so that the boost circuit 20 boosts the discharge voltage (2.5V) of the capacitor circuit 10 (boosts to 12V) and outputs it to the input end of the step-down circuit. The step-down circuit 30 then steps down the received voltage (steps down to 3.3V) and outputs it to the power access end of the carrier chip, thereby providing a short period of energy supply for the carrier chip, so that the carrier chip can report the power outage event to the main station in time after the power grid is out of power; when the power grid is supplying power normally, the step-down circuit 30 steps down the voltage at the power input end and outputs it to the carrier chip and the capacitor circuit 10 respectively, thereby charging the carrier chip and the capacitor circuit 10 at the same time. With this arrangement, in practical applications, when a power outage occurs, the discharge voltage of the capacitor circuit 10 is converted sequentially by the boost circuit 20 and the buck circuit 30 and then output to the carrier chip, thereby providing a short period of power supply to the carrier chip and ensuring timely reporting of power outage information. Furthermore, the present invention integrates the boost circuit 20, the buck circuit 30, and the control circuit 50 into the same chip, and the package can be a small package such as SOP or DFN. This effectively reduces the footprint of the power supply circuit of the present invention in the power line carrier communication module, thereby reducing the design difficulty of the PCB of the power line carrier communication module.

[0073] refer to Figure 2 and Figure 3 In one embodiment of the present invention, the power supply circuit further includes:

[0074] a constant current source 60 , wherein an input end of the constant current source 60 is electrically connected to an output end of the step-down circuit 30 , and an output end of the constant current source 60 is electrically connected to a charging end of the capacitor circuit 10 ;

[0075] The constant current source 60 , the control circuit 50 , the boost circuit 20 , and the buck circuit 30 are all integrated into the same chip.

[0076] In this embodiment, the constant current source 60 is used to process the current output by the step-down circuit 30 and output a constant current to charge the capacitor circuit 10. This configuration is compared with the traditional RC current-limited charging method, which has a large current at the beginning of charging and a charging current that gradually decreases as the charging time increases, requiring a long time to fully charge the capacitor circuit 10. The constant current source 60 ensures that the current received by the capacitor circuit 10 is always stable during the charging process, avoiding the decrease in charging efficiency due to current fluctuations. Since the current is constant, the capacitor circuit 10 can reach a higher charge level in a shorter time, thereby improving the charging efficiency.

[0077] In this embodiment, compared with the traditional discrete solution (the control circuit 50, the buck circuit 30 and the boost circuit 20 respectively use independent chips), the constant current source 60, the control circuit 50, the boost circuit 20 and the buck circuit 30 are all integrated in the same chip, and the wafer area of ​​the chip can be made smaller than the sum of multiple independent chip wafers of the discrete solution. In this way, not only the occupied area of ​​the power supply circuit can be reduced, but also the packaging and testing cost of the chip can be reduced.

[0078] refer to Figure 3 In one embodiment of the present invention, the boost circuit 20 includes:

[0079] A first synchronous rectification circuit 21 and a first inductor circuit 22, wherein the first synchronous rectification circuit 21 includes a first switching tube Q1, a second switching tube Q2 and a first driving circuit;

[0080] The output end of the second switch tube Q2 is electrically connected to the input end VIN2 of the step-down circuit 30, the input end of the second switch tube Q2 is electrically connected to the input end of the first switch tube Q1, the output end of the first switch tube Q1 is grounded, and the controlled end of the second switch tube Q2 and the controlled end of the first switch tube Q1 are both electrically connected to the control end of the first drive circuit;

[0081] The controlled end of the first driving circuit is electrically connected to the control end of the control circuit 50;

[0082] The first end of the first inductor circuit 22 is electrically connected to the input end of the second switch tube Q2 and the input end of the first switch tube Q1 respectively;

[0083] The first synchronous rectification circuit 21 , the buck circuit 30 and the control circuit 50 are all integrated into the same chip.

[0084] In this embodiment, the first switching transistor Q1 and the second switching transistor Q2 are both NMOS transistors. The first switching transistor Q1, the second switching transistor Q2, and the first drive circuit form a synchronous rectification circuit. Compared with traditional asynchronous rectification circuits, which typically place freewheeling diodes outside the chip, the synchronous rectification circuit replaces the external freewheeling diodes of the asynchronous rectification circuit with internally integrated MOS transistors. This configuration reduces the number of external components in the power supply circuit, thereby simplifying the circuit design and production process and reducing overall hardware costs. In practical applications, because the conduction voltage drop of MOS transistors is lower than that of diodes, the heat loss generated by MOS transistors is also reduced under the same operating current. This helps to reduce the operating temperature of the power line carrier communication module used in the power supply circuit of the utility model, thereby improving the stability and reliability of the power line carrier communication module.

[0085] In this embodiment, when the control circuit 50 detects that the voltage of the power input terminal VIN1 drops to a preset voltage, it indicates that the power grid has been cut off. The control circuit 50 controls the first drive circuit to operate, and the first drive circuit controls the on / off of the first switch tube Q1 and the second switch tube Q2 respectively, so that the discharge voltage of the capacitor circuit 10 is output to the power input terminal VIN1 after being boosted.

[0086] In this embodiment, the first inductor circuit 22 uses at least one inductor, for example Figure 3 The inductor L1 in.

[0087] In this embodiment, the power supply circuit further includes:

[0088] a first voltage divider circuit 70, wherein a first end of the first voltage divider circuit 70 is electrically connected to an output end of the second switch tube Q2;

[0089] The first driving circuit includes:

[0090] A first driving module, a first amplifier EA1, and a first oscillator source, wherein the control end of the first driving module is electrically connected to the controlled end of the first switch tube Q1 and the controlled end of the second switch tube Q2 respectively; the controlled end of the first driving module is electrically connected to the control end of the control circuit 50;

[0091] The first input end of the first amplifier EA1 is electrically connected to the second end of the first voltage divider circuit 70, the second input end of the first amplifier EA1 is electrically connected to the output end of the first oscillation source, and the output end of the first amplifier EA1 is electrically connected to the signal receiving end of the first driving module.

[0092] In this embodiment, the first voltage divider circuit 70 includes:

[0093] A first resistor R1 and a second resistor R2, wherein the first end of the first resistor R1 is electrically connected to the output end of the boost circuit 20, the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2, the first end of the second resistor R2 is also electrically connected to the first input end of the first amplifier EA1, and the second end of the second resistor R2 is grounded; wherein the output end of the boost circuit 20 and the input end VIN2 of the buck circuit 30 are the same end.

[0094] In this embodiment, the first voltage divider circuit 70 is used to collect the output voltage of the boost circuit 20 and feed back the corresponding feedback voltage V FB-BS To the first amplifier EA1, when the first voltage divider circuit 70 includes a first resistor R1 and a second resistor R2, the output voltage of the boost circuit 20 is The feedback voltage V FB-BS is the voltage of the first resistor R1; the first oscillator source is used to output a fixed frequency PWM signal, the first amplifier EA1 is an error amplifier, the error amplifier is used according to the feedback voltage V of the first voltage divider circuit 70 FB-BS The first driving module is used to adjust the switching states of the first switch tube Q1 and the second switch tube Q2 according to the error signal so that the output voltage of the boost circuit 20 can be maintained near the preset voltage (12V).

[0095] In this embodiment, the second inductor circuit 32 includes at least one inductor, for example Figure 3 The second inductor L2 in.

[0096] refer to Figure 3 In one embodiment of the present invention, the step-down circuit 30 includes:

[0097] A second synchronous rectification circuit 31 and a second inductor circuit 32, wherein the second synchronous rectification circuit 31 includes a third switch tube Q3, a fourth switch tube Q4 and a second drive circuit;

[0098] The input terminal VIN2 of the third switch tube Q3 is electrically connected to the power input terminal VIN1 and the output terminal of the boost circuit 20 respectively. The output terminal of the third switch tube Q3 is electrically connected to the input terminal of the fourth switch tube Q4. The output terminal of the fourth switch tube Q4 is grounded. The controlled terminal of the third switch tube Q3 and the controlled terminal of the fourth switch tube Q4 are both electrically connected to the control terminal of the second drive circuit.

[0099] a second inductor circuit 32, wherein a first end of the second inductor circuit 32 is electrically connected to the output end of the third switch tube Q3, and a second end of the second inductor circuit 32 is electrically connected to the power supply input end of the carrier chip and the charging end of the capacitor circuit 10 respectively;

[0100] The second synchronous rectification circuit 31 , the boost circuit 20 and the control circuit 50 are all integrated into the same chip.

[0101] In this embodiment, the third switch Q3 and the fourth switch Q4 are both NMOS transistors. The input terminal of the third switch Q3 is the input terminal VIN2 of the step-down circuit 30. The third switch Q3, the fourth switch Q4, and the second drive circuit form a synchronous rectifier circuit. Compared with traditional asynchronous rectifier circuits, which typically place the freewheeling diode outside the chip, the synchronous rectifier circuit replaces the external freewheeling diode with an internally integrated MOS transistor. This configuration reduces the number of external components in the power supply circuit, thereby simplifying the circuit design and production process and reducing overall hardware costs. In practical applications, because the conduction voltage drop of the MOS transistor is lower than that of the diode, the MOS transistor generates less heat loss at the same operating current, which helps to reduce the operating temperature of the power line carrier communication module used in the power supply circuit of the utility model, thereby improving the stability and reliability of the power line carrier communication module.

[0102] In this embodiment, the power supply circuit further includes:

[0103] a second voltage divider circuit 80 , wherein a first end of the second voltage divider circuit 80 is electrically connected to a second end of the second inductor circuit 32 ;

[0104] The second driving circuit includes:

[0105] a second driving module, a second amplifier EA2 and a second oscillation source;

[0106] The control end of the second driving module is electrically connected to the controlled end of the third switch tube Q3 and the controlled end of the fourth switch tube Q4 respectively;

[0107] The first input terminal of the second amplifier EA2 is electrically connected to the output terminal of the second oscillation source, the second input terminal of the second amplifier EA2 is electrically connected to the second terminal of the second voltage divider circuit 80, and the output terminal of the second amplifier EA2 is electrically connected to the signal receiving terminal circuit of the second driving module;

[0108] The second voltage divider circuit 80 , the control circuit 50 , the boost circuit 20 , and the buck circuit 30 are all integrated into the same chip.

[0109] In this embodiment, the second voltage divider circuit 80 includes a fifth resistor R5 and a sixth resistor R6, a first end of the fifth resistor R5 is electrically connected to the output end of the step-down circuit 30, a second end of the fifth resistor R5 is electrically connected to the first end of the sixth resistor R6, a second end of the sixth resistor R6 is grounded, and a first end of the sixth resistor R6 is electrically connected to the second input end of the second amplifier EA2.

[0110] In this embodiment, the second voltage divider circuit 80 is used to collect the output voltage of the step-down circuit 30 and feed back the corresponding feedback voltage V FB-BU To the second amplifier EA2, when the second voltage divider circuit 80 includes the fifth resistor R5 and the sixth resistor R6, the output voltage of the step-down circuit 30 is The feedback voltage V FB-BU The second oscillator source is used to output a fixed frequency PWM signal, and the second amplifier EA2 is an error amplifier, which is used to generate a feedback voltage V according to the second voltage divider circuit 80. FB-BU The output of the buck circuit 30 is controlled by the error signal between the fixed frequency PWM signal and the output of the corresponding error signal to the second driving module. The second driving module is used to adjust the switching states of the third switch tube Q3 and the fourth switch tube Q4 according to the error signal so that the output voltage of the buck circuit 30 can be maintained near the preset voltage (3.3V).

[0111] refer to Figure 3 In one embodiment of the present invention, when the power supply circuit includes a first oscillation source and a second oscillation source, the first oscillation source and the second oscillation source are the same oscillation source, and the oscillation frequency of the oscillation source is less than 700KHZ or greater than 12MHZ.

[0112] In this embodiment, the first synchronous rectification circuit 21 and the second synchronous rectification circuit 31 share the same vibration source, which not only reduces the number of components required inside the chip but also improves the space utilization of the chip.

[0113] In this embodiment, the oscillation frequency of the oscillation source is not in the 700kHz~12MHz communication frequency band used by HPLC broadband carrier communication, and can be set to 500kHz~700kHz, thereby effectively avoiding the HPLC carrier communication frequency band, reducing mutual interference caused by frequency overlap, and greatly reducing the impact of the switching noise generated by the first synchronous rectification circuit 21 or the second synchronous rectification circuit 31 on the carrier communication signal, so that the carrier communication signal received by the carrier chip is purer, thereby improving the sensitivity of the carrier chip and ensuring the data acquisition effect.

[0114] It should be noted that the oscillation frequency of the oscillation source should not be too low. If the frequency is too low, the volume of the magnetic components inside the oscillation source will be too large, thereby increasing the area occupied by the chip.

[0115] refer to Figure 3 In one embodiment of the present invention, the voltage detection circuit 40 includes:

[0116] A third resistor R3 and a fourth resistor R4, wherein a first end of the third resistor R3 is electrically connected to the power input terminal VIN1, a second end of the third resistor R3 is electrically connected to a first end of the fourth resistor R4, and a second end of the fourth resistor R4 is grounded; and a first end of the fourth resistor R4 is electrically connected to a signal receiving terminal of the control circuit 50.

[0117] In this embodiment, the control circuit 50 determines the voltage of the power input terminal VIN1 based on the voltage across the fourth resistor R4. When a power outage occurs, the voltage across the power input terminal VIN1 drops. When the voltage across the power input terminal VIN1 drops to a preset voltage, the voltage across the fourth resistor R4 also drops to a preset voltage. When the voltage across the fourth resistor R4 drops to a preset voltage, the control circuit 50 controls the boost circuit 20 to operate, causing the discharge voltage of the capacitor circuit 10 to be converted sequentially through the boost circuit 20 and the step-down circuit 30 and then output to the carrier chip. This provides a short period of power to the carrier chip and ensures timely reporting of power outage information.

[0118] refer to Figure 3 In one embodiment of the present utility model, the power supply circuit further includes a first diode D1, and the first diode D1 is used to prevent the discharge current of the capacitor circuit 10 from flowing back;

[0119] The first capacitor C1 is further provided. The first end of the first capacitor C1 is electrically connected to the power input terminal VIN1. The second end of the first capacitor C1 is grounded. The first capacitor C1 is used to filter the input voltage of the power input terminal VIN1.

[0120] The device further includes a third capacitor C3, which is a bootstrap capacitor.

[0121] A fourth capacitor C4 is also included, and the fourth capacitor C4 is used to filter the output voltage of the step-down circuit 30 .

[0122] The present invention also proposes a power line carrier communication module, comprising a carrier chip and the power supply circuit as described above; wherein the input end of the power supply circuit is connected to a power supply, and the output end of the power supply circuit is electrically connected to the power supply access end of the carrier chip.

[0123] It is worth noting that since the power line carrier communication module of the present invention is based on the above-mentioned power supply circuit, the embodiments of the power line carrier communication module of the present invention include all technical solutions of all embodiments of the above-mentioned power supply circuit, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0124] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A power supply circuit, applied to a power line carrier communication module, wherein the power line carrier communication module includes a carrier chip, characterized in that: The power supply circuit comprises: Power input terminal, used to connect to the power supply; Capacitor circuit; a boost circuit, wherein an input end of the boost circuit is electrically connected to a discharge end of the capacitor circuit; a step-down circuit, wherein the input end of the step-down circuit is electrically connected to the power input end and the output end of the boost circuit respectively, and the output end of the step-down circuit is electrically connected to the charging end of the capacitor circuit and the power access end of the carrier chip respectively; a voltage detection circuit, wherein a detection terminal of the voltage detection circuit is electrically connected to the power input terminal, and the voltage detection circuit is used to detect the voltage of the power input terminal; a control circuit, wherein a signal receiving end of the control circuit is electrically connected to the output end of the voltage detection circuit, and a control end of the control circuit is electrically connected to the controlled end of the boost circuit; The control circuit is used to control the boost circuit to operate when the voltage at the power input terminal is lower than a preset voltage; The control circuit, the boost circuit and the buck circuit are all integrated in the same chip.

2. The power supply circuit according to claim 1, wherein: The power supply circuit further includes: a constant current source, wherein an input end of the constant current source is electrically connected to an output end of the step-down circuit, and an output end of the constant current source is electrically connected to a charging end of the capacitor circuit; The constant current source, the control circuit, the boost circuit and the buck circuit are all integrated in the same chip.

3. The power supply circuit according to claim 1, wherein: The boost circuit comprises: A first synchronous rectification circuit and a first inductor circuit, wherein the first synchronous rectification circuit includes a first switching tube, a second switching tube and a first driving circuit; The output end of the second switching tube is electrically connected to the input end of the step-down circuit, the input end of the second switching tube is electrically connected to the input end of the first switching tube, the output end of the first switching tube is grounded, and the controlled end of the second switching tube and the controlled end of the first switching tube are both electrically connected to the control end of the first driving circuit; The controlled end of the first driving circuit is electrically connected to the control end of the control circuit; The first end of the first inductor circuit is electrically connected to the input end of the second switching tube and the input end of the first switching tube respectively; The first synchronous rectification circuit, the step-down circuit and the control circuit are all integrated into the same chip.

4. The power supply circuit according to claim 3, wherein: The power supply circuit further includes: a first voltage divider circuit, wherein a first end of the first voltage divider circuit is electrically connected to an output end of the second switching tube; The first driving circuit includes: a first driving module, a first amplifier, and a first oscillating source, wherein the control end of the first driving module is electrically connected to the controlled end of the first switching tube and the controlled end of the second switching tube respectively; and the controlled end of the first driving module is electrically connected to the control end of the control circuit; The first input end of the first amplifier is electrically connected to the second end of the first voltage divider circuit, the second input end of the first amplifier is electrically connected to the output end of the first oscillation source, and the output end of the first amplifier is electrically connected to the signal receiving end of the first driving module.

5. The power supply circuit according to claim 1, wherein: The step-down circuit comprises: a second synchronous rectification circuit and a second inductor circuit, wherein the second synchronous rectification circuit includes a third switching tube, a fourth switching tube and a second driving circuit; The input end of the third switch tube is electrically connected to the power input end and the output end of the boost circuit respectively, the output end of the third switch tube is electrically connected to the input end of the fourth switch tube, the output end of the fourth switch tube is grounded, and the controlled end of the third switch tube and the controlled end of the fourth switch tube are both electrically connected to the control end of the second drive circuit; a second inductor circuit, wherein a first end of the second inductor circuit is electrically connected to the output end of the third switching tube, and a second end of the second inductor circuit is electrically connected to the power supply access end of the carrier chip and the charging end of the capacitor circuit respectively; The second synchronous rectification circuit, the boost circuit and the control circuit are all integrated into the same chip.

6. The power supply circuit according to claim 5, wherein: The power supply circuit further includes: a second voltage divider circuit, wherein a first end of the second voltage divider circuit is electrically connected to a second end of the second inductor circuit; The second driving circuit includes: a second driving module, a second amplifier, and a second oscillation source; The control end of the second driving module is electrically connected to the controlled end of the third switch tube and the controlled end of the fourth switch tube respectively; The first input terminal of the second amplifier is electrically connected to the output terminal of the second oscillation source, the second input terminal of the second amplifier is electrically connected to the second terminal of the second voltage divider circuit, and the output terminal of the second amplifier is electrically connected to the signal receiving terminal circuit of the second driving module; The second voltage divider circuit, the control circuit, the voltage boost circuit and the voltage step-down circuit are all integrated into the same chip.

7. The power supply circuit according to claim 4 or 6, wherein: When the power supply circuit includes a first oscillation source and a second oscillation source, the first oscillation source and the second oscillation source are the same oscillation source, and the oscillation frequency of the oscillation source is less than 700 KHZ or greater than 12 MHZ.

8. The power supply circuit according to claim 4, wherein: The first voltage divider circuit includes: A first resistor and a second resistor, wherein the first end of the first resistor is electrically connected to the power input terminal, the second end of the first resistor is electrically connected to the first end of the second resistor, the first end of the second resistor is also electrically connected to the first input terminal of the first amplifier, and the second end of the second resistor is grounded.

9. The power supply circuit according to claim 1, wherein: The voltage detection circuit comprises: a third resistor and a fourth resistor, wherein the first end of the third resistor is electrically connected to the power input end, the second end of the third resistor is electrically connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded; and the first end of the fourth resistor is electrically connected to the signal receiving end of the control circuit.

10. A power line carrier communication module, characterized in that: It comprises a carrier chip and a power supply circuit according to any one of claims 1 to 9; wherein the input end of the power supply circuit is connected to a power supply, and the output end of the power supply circuit is electrically connected to the power supply input end of the carrier chip.

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