Power supply circuit and system of communication module

Abstract

The invention provides a power supply circuit and system of a communication module, and relates to the technical field of electronic circuits. The circuit comprises a voltage stabilizing module, a small current control module, a large current control module and an output module. When the single-chip microcomputer is connected with the small-current communication module, the large-current control module is turned off, and the output module outputs the first voltage output by the voltage stabilizing module to the power supply end of the small-current communication module. When the single-chip microcomputer is connected with the large-current communication module, the small-current control module is turned off, and the output module outputs the second voltage output by the large-current control module to the power supply end of the large-current communication module. Wherein the first voltage is smaller than the second voltage. The circuit can supply power to different types of communication modules, and realizes rapid switching of different types of communication modules on a product. Moreover, the circuit does not need to modify the control logic of each device, has the characteristics of few devices, simple circuit structure and flexible current regulation, reduces the area of a PCB (Printed Circuit Board), and greatly reduces the production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a power supply circuit and system for a communication module. Background Art

[0002] With the popularity of blood pressure monitors, the functional requirements of various medical institutions for blood pressure monitors have also increased accordingly. By adding a communication module to the blood pressure monitor, the blood pressure monitor can be connected to a smartphone or other device so that data can be transmitted to the application for analysis and recording. The communication module is divided into a low-current communication module (for example, a Bluetooth module) and a high-current communication module (for example, a WIFI or 4G functional wireless communication module). In order to ensure that the blood pressure monitor can switch to different communication modules as required, it is necessary to focus on the power supply circuit design of the communication module.

[0003] At present, the power supply circuit design for blood pressure monitors with communication modules is single and can only power a specific communication module. For example, when upgrading a Bluetooth version blood pressure monitor to a high-current version such as a WIFI version, since the previous power supply circuit only powered Bluetooth, it now needs to power WIFI, there is a problem of insufficient power driving force, resulting in the inability to upgrade. Conversely, if a WIFI version blood pressure monitor is changed to a Bluetooth low-current version blood pressure monitor, the power driving force greatly exceeds the requirements of the Bluetooth function, resulting in high switching costs.

[0004] In summary, how to power different types of communication modules and reduce production costs is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0005] The purpose of the present application is to provide a power supply circuit and system for a communication module to supply power to different types of communication modules and reduce production costs.

[0006] In order to achieve the above purpose, the technical solution adopted in this application is as follows:

[0007] On the one hand, the present application provides a power supply circuit of a communication module, the circuit comprising: a voltage stabilizing module, a small current control module, a large current control module and an output module; the input end of the voltage stabilizing module and the input end of the large current control module are both connected to the power supply end, the output end of the voltage stabilizing module is respectively connected to the power supply end of the single-chip microcomputer, the small current control module and the large current control module, and the output module is respectively connected to the small current control module and the large current control module; wherein the communication module comprises a large current communication module and a small current communication module, and the single-chip microcomputer is used to connect to the small current communication module or the large current communication module according to a switching instruction;

[0008] When the single chip microcomputer is connected to the low current communication module, the high current control module is turned off, and the output module is used to output the first voltage output by the voltage stabilizing module to the power supply end of the low current communication module under the control of the low current control module;

[0009] When the single-chip microcomputer is connected to the high-current communication module, the low-current control module is turned off, and the output module is used to output the second voltage output by the high-current control module to the power supply end of the high-current communication module under the control of the high-current control module; wherein the first voltage is less than the second voltage.

[0010] Optionally, the power supply circuit of the communication module further includes an interface module, and the interface module outputs a high level according to the power-on status of the single-chip microcomputer and the communication module to activate the large current control module or the small current control module.

[0011] Optionally, the interface module includes a first diode and a second diode; the anode of the first diode is connected to the input and output pins of the single-chip microcomputer, the anode of the second diode is connected to the input and output pins of the communication module, and the cathode of the first diode and the cathode of the second diode are connected to the small current control module and the large current control module.

[0012] Optionally, the small current control module includes a first resistor, a second resistor and an N-type switch tube; one end of the first resistor is connected to the output end of the voltage stabilizing module, the other end of the first resistor is connected to the first port of the output module, the second port of the output module is connected to the power supply end of the small current communication module through the second resistor, the third port of the output module is connected to the first port of the N-type switch tube, the second port of the N-type switch tube is grounded, and the third port of the N-type switch tube is respectively connected to the cathode of the first diode and the cathode of the second diode.

[0013] Optionally, the N-type switch tube is an NPN transistor or an NMOS tube.

[0014] Optionally, the high current control module includes a third diode, a third resistor and a voltage conversion unit; the anode of the third diode is connected to the output end of the voltage stabilizing module, and the cathode of the third diode is connected to the first port of the output module; the input end of the voltage conversion unit is connected to the power supply end, the enable end of the voltage conversion unit is respectively connected to the cathode of the first diode and the cathode of the second diode, and the output end of the voltage conversion unit is connected to the second port of the output module; the first port of the output module is also connected to the power supply end of the high current communication module through the third resistor.

[0015] Optionally, the voltage conversion unit includes a DC-DC buck converter and an inductor; the input end of the DC-DC buck converter is connected to the power supply end, the enable end of the DC-DC buck converter is respectively connected to the cathode of the first diode and the cathode of the second diode, and the output end of the DC-DC buck converter is connected to the second port of the output module through the inductor; the DC-DC buck converter is used to convert the power supply voltage into the second voltage.

[0016] Optionally, the output module includes a PMOS tube and a fourth resistor; the first port of the output module is the source of the PMOS tube, the second port of the output module is the drain of the PMOS tube, and the third port of the output module is the gate of the PMOS tube; one end of the fourth resistor is connected to the source of the PMOS tube, and the other end of the fourth resistor is connected to the gate of the PMOS tube;

[0017] When the single chip microcomputer is connected to the low current communication module, the high current control module is turned off, the PMOS tube is turned on, and the first voltage is output to the power supply end of the low current communication module through the PMOS tube;

[0018] When the single chip microcomputer is connected to the high current communication module, the low current control module is turned off, the PMOS tube is cut off, and the second voltage is output to the power supply end of the high current communication module through the body diode in the PMOS tube.

[0019] Optionally, the voltage stabilizing module includes a voltage stabilizing chip and a fifth resistor; the input end of the voltage stabilizing chip is connected to the power supply end, the enable end of the voltage stabilizing chip is connected to the power supply end through the fifth resistor, and the output end of the voltage stabilizing chip is respectively connected to the power supply end of the microcontroller, the large current control module and the small current control module; the voltage stabilizing chip is used to convert the power supply voltage into the first voltage.

[0020] On the other hand, the present application also provides a power supply system for a communication module, the system comprising a power supply circuit for a communication module as described in any one of the aforementioned embodiments.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] The present application provides a power supply circuit and system for a communication module, the circuit comprising: a voltage stabilizing module, a low current control module, a high current control module and an output module. The input end of the voltage stabilizing module and the input end of the high current control module are both connected to the power supply end, the output end of the voltage stabilizing module is respectively connected to the power supply end of the single chip microcomputer, the low current control module and the high current control module, and the output module is respectively connected to the low current control module and the high current control module. Among them, the communication module comprises a high current communication module and a low current communication module.

[0023] The power supply circuit of the communication module provided in the present application only needs to turn off the high current control module or the low current control module according to the type of the communication module, and output the corresponding voltage to power the high current communication module or the low current communication module, thereby realizing the rapid switching of different types of communication modules on products (for example, a sphygmomanometer or other electronic products). The power supply circuit does not need to modify the control logic of each device, has the characteristics of few devices, simple circuit structure, and flexible current regulation, reduces the area of ​​the PCB board, and greatly reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians of the art without making creative work are within the scope of protection of the present application.

[0025] Figure 1 One of the circuit diagrams of a power supply circuit of a communication module provided in the present application;

[0026] Figure 2 The second circuit diagram of a power supply circuit of a communication module provided in the present application;

[0027] Figure 3 A circuit diagram of a small current control module provided in this application;

[0028] Figure 4 A circuit diagram of a high current control module provided in this application;

[0029] Figure 5 A schematic diagram of a method for supplying power to a low-current communication module provided in this application;

[0030] Figure 6 One of the schematic diagrams for supplying power to a high current communication module provided in this application;

[0031] Figure 7 This is the second schematic diagram of a method for supplying power to a high current communication module provided in this application.

[0032] Figure numerals: 10 - power supply circuit of communication module; 110 - voltage stabilizing module; 120 - small current control module; 130 - large current control module; 131 - voltage conversion unit; 140 - output module; 150 - interface module. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0034] In the description of this application, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium.

[0035] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] As mentioned in the background technology, most electronic products have communication functions. Since communication modules are divided into low-current communication modules and high-current communication modules, in order to ensure that the product can switch to different communication modules as needed, it is necessary to focus on the power supply circuit design of the communication module.

[0037] At present, the power supply circuit design for blood pressure monitors with communication modules is single and can only power a specific communication module. For example, when upgrading a product with a low-current communication module version to a product with a high-current communication module version, there is a problem of insufficient power driving force, resulting in an inability to upgrade. Conversely, when changing a product with a high-current communication module version to a product with a low-current communication module version, the power driving force greatly exceeds the requirements of the low-current communication function, resulting in high switching costs.

[0038] Therefore, how to power different communication modules and reduce costs is a technical problem that needs to be solved urgently by those skilled in the art.

[0039] In view of this, please refer to Figure 1 An embodiment of the present application provides a power supply circuit 10 of a communication module, the circuit comprising: a voltage stabilizing module 110 , a small current control module 120 , a large current control module 130 and an output module 140 .

[0040] The input end of the voltage stabilizing module 110 and the input end of the high current control module 130 are both connected to the power supply end VIN, and the output end of the voltage stabilizing module 110 is respectively connected to the power supply end MCU_VDD of the microcontroller, the low current control module 120 and the high current control module 130. The output module 140 is respectively connected to the low current control module 120 and the high current control module 130.

[0041] It should be noted that the communication module includes a low current communication module (e.g., a Bluetooth module) and a high current communication module (e.g., a WIFI or 4G wireless communication module). After the microcontroller is powered on, it is connected to the low current communication module or the high current communication module according to the switching instruction input from the outside.

[0042] When the microcontroller is connected to the low current communication module, the high current control module 130 is turned off. The output module 140 is used to output the first voltage output by the voltage regulator module 110 to the power supply terminal MD1_VDD of the low current communication module under the control of the low current control module 120 to supply power to the low current communication module.

[0043] When the single chip microcomputer is connected to the high current communication module, the low current control module 120 is turned off. The output module 140 is used to output the second voltage output by the high current control module 130 to the power supply terminal MD2_VDD of the high current communication module under the control of the high current control module 130, so as to supply power to the high current communication module. The first voltage is less than the second voltage.

[0044] As an optional implementation, when the single-chip microcomputer needs to be connected to the low-current communication module, all the components included in the high-current control module 130 can be left blank to ensure that the high-current control module 130 is turned off. Similarly, when the single-chip microcomputer needs to be connected to the high-current communication module, all the components included in the low-current control module 120 can be left blank to ensure that the low-current control module 120 is turned off.

[0045] Based on the above design, according to the type of communication module, the high current control module or the low current control module is turned off (i.e., empty), so as to output the corresponding voltage to power the high current communication module or the low current communication module, so as to realize the fast switching of different types of communication modules on products (e.g., sphygmomanometers or other electronic products). In addition, the power supply circuit of the communication module provided by the present application has the characteristics of few components, simple circuit structure, and flexible current regulation. It is only necessary to select and paste the corresponding components according to the type of communication module, without modifying the control logic of each component, reducing the area of ​​the PCB board and greatly reducing the production cost.

[0046] See also Figure 2 In the embodiment of the present application, the voltage stabilizing module 110 includes a voltage stabilizing chip U1 and a fifth resistor R5. The input end of the voltage stabilizing chip U1 is connected to the power supply end VIN, the enable end of the voltage stabilizing chip U1 is connected to the power supply end VIN through the fifth resistor R5, and the output end of the voltage stabilizing chip U1 is respectively connected to the power supply end MCU_VDD of the single-chip microcomputer, the large current control module 130 and the small current control module 120. Among them, the voltage stabilizing chip U1 is used to convert the power supply voltage VIN into a first voltage (for example, 3.3V) to power the single-chip microcomputer and the small current communication module.

[0047] Further, in order to improve the signal quality, the voltage stabilizing module 110 may also include a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5. Among them, one end of the first capacitor C1 and the second capacitor C2 are connected to the input end of the voltage stabilizing chip U1, and the other end is grounded. One end of the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are connected to the output end of the voltage stabilizing chip U1, and the other end is grounded.

[0048] In addition, as an optional implementation, the power supply circuit 10 of the communication module further includes an interface module 150. The interface module 150 outputs a high level to activate the high current control module 130 or the low current control module 120 according to the power-on status of the single-chip microcomputer and the communication module.

[0049] Specifically, the interface module 150 includes a first diode D1 and a second diode D2. The anode of the first diode D1 is connected to the input / output pin MCU_IO of the single-chip microcomputer, the anode of the second diode D2 is connected to the input / output pin MD_IO of the communication module, and the cathode of the first diode D1 and the cathode of the second diode D2 are connected to the small current control module 120 and the large current control module 130.

[0050] The first diode D1 and the second diode D2 form an "OR gate" circuit. As long as any one of the input and output pin MCU_IO of the microcontroller and the input and output pin MD_IO of the communication module is at a high level, the output of the interface module 150 is also at a high level.

[0051] In order to better understand the working principle of the power supply circuit 10 of the communication module, the specific structures of the small current control module 120 and the large current control module 130 are first described below.

[0052] The specific structure of the small current control module 120 is as follows Figure 3 As shown, in the embodiment of the present application, the small current control module 120 includes a first resistor R1, a second resistor R2 and an N-type switch tube Q1. Among them, one end of the first resistor R1 is connected to the output end of the voltage stabilizing module 110, and the other end of the first resistor R1 is connected to the first port of the output module 140. The second port of the output module 140 is connected to the power supply end MD1_VDD of the small current communication module through the second resistor R2, and the third port of the output module 140 is connected to the first port of the N-type switch tube Q1. The second port of the N-type switch tube Q1 is grounded, and the third port of the N-type switch tube Q1 is respectively connected to the cathode of the first diode D1 and the cathode of the second diode D2.

[0053] Optionally, the low current control module 120 may further include a sixth resistor R6 and a seventh resistor R7. The third port of the N-type switch tube Q1 is connected to one end of the sixth resistor R6 and the seventh resistor R7, respectively, the other end of the sixth resistor R6 is grounded, and the other end of the seventh resistor R7 is connected to the cathode of the first diode D1 and the cathode of the second diode D2, respectively.

[0054] It should be noted that the embodiment of the present application does not limit the type of the N-type switch tube Q1, that is, the N-type switch tube Q1 can be an NPN transistor or an NMOS transistor. If the N-type switch tube Q1 is an NPN transistor, the first port of the N-type switch tube Q1 is the collector, the second port of the N-type switch tube Q1 is the emitter, and the first port of the N-type switch tube Q1 is the base.

[0055] The specific structure of the high current control module 130 is as follows: Figure 4As shown, in the embodiment of the present application, the high current control module 130 includes a third diode D3, a third resistor R3 and a voltage conversion unit 131. Among them, the anode of the third diode D3 is connected to the output end of the voltage stabilizing module 110, and the cathode of the third diode D3 is connected to the first port of the output module 140. The input end of the voltage conversion unit 131 is connected to the power supply end VIN, the enable end of the voltage conversion unit 131 is respectively connected to the cathode of the first diode D1 and the cathode of the second diode D2, and the output end of the voltage conversion unit 131 is connected to the second port of the output module 140. The first port of the output module 140 is also connected to the power supply end MD2_VDD of the high current communication module through the third resistor R3.

[0056] As a feasible implementation, the voltage conversion unit 131 includes a DC-DC buck converter U2 and an inductor L1. The input terminal IN of the DC-DC buck converter U2 is connected to the power terminal VIN, the enable terminal EN of the DC-DC buck converter U2 is connected to the cathode of the first diode D1 and the cathode of the second diode D2 respectively through the eighth resistor R8, and the output terminal SW of the DC-DC buck converter U2 is connected to the second port of the output module 140 through the inductor L1. The DC-DC buck converter U2 is used to convert the power supply voltage VIN into a second voltage (for example, 3.8V) to power the high-current communication module.

[0057] In addition, in order to better adjust the output voltage (i.e., the second voltage) of the DC-DC buck converter U2, the voltage conversion unit 131 may further include a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. One end of the tenth resistor R10 is connected to the PG pin of the DC-DC buck converter U2, the other end of the tenth resistor R10 is respectively connected to the inductor L1 and one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is respectively connected to the feedback end FB of the DC-DC buck converter U2 and one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded. The second voltage is adjusted by adjusting the resistance values ​​of the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12.

[0058] Further, in order to improve the quality of the second voltage signal, the voltage conversion unit 131 may also include a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9 and a tenth capacitor C10. Among them, one end of the sixth capacitor C6 and the seventh capacitor C7 are connected to the input terminal IN of the DC-DC buck converter U2, and the other end is grounded. One end of the eighth capacitor C8, the ninth capacitor C9 and the tenth capacitor C10 are connected to one end of the inductor L1, the other end of the eighth capacitor C8 is connected to the feedback terminal FB of the DC-DC buck converter U2, and the other end of the ninth capacitor C9 and the tenth capacitor C10 are grounded.

[0059] See also Figure 3 and Figure 4 In the embodiment of the present application, the output module 140 includes a PMOS transistor Q2 and a fourth resistor R4, wherein one end of the fourth resistor R4 is connected to the source of the PMOS transistor Q2, and the other end of the fourth resistor R4 is connected to the gate of the PMOS transistor Q2.

[0060] The first port of the output module 140 is the source of the PMOS transistor Q2 , the second port of the output module 140 is the drain of the PMOS transistor Q2 , and the third port of the output module 140 is the gate of the PMOS transistor Q2 .

[0061] That is, the source of the PMOS tube Q2 is respectively connected to one end of the fourth resistor R4, one end of the first resistor R1 in the small current control module 120, and one end of the third resistor R3 and the third diode D3 in the large current control module 130.

[0062] The drain of the PMOS tube Q2 is connected to one end of the second resistor R2 in the small current control module 120 and the output end of the voltage conversion unit 131 in the large current control module 130 respectively.

[0063] The gate of the PMOS tube Q2 is respectively connected to the other end of the fourth resistor R4 and the first port (equivalent to the collector of the NPN transistor) of the N-type switch tube Q1 in the small current control module 120 .

[0064] Based on the above introduction to each module in the power supply circuit 10 of the communication module, Figures 5 to 7 , the working principle of the circuit is explained in detail.

[0065] See also Figure 5 When the single-chip microcomputer is connected to the low-current communication module, the high-current control module 130 is turned off (i.e., U2, L1, D3, R3, R8~R12, C6~C10 are all empty). The power supply voltage VIN is stepped down to a first voltage (e.g., 3.3V) through the voltage regulator chip U1 to power the single-chip microcomputer. After the single-chip microcomputer is powered on, the potential of the MCU_IO pin is raised, so that point A (i.e., the output end of the interface module) is at a high level, thereby pulling up the first port of the N-type switch tube Q1 (i.e., the base of the NPN transistor is at a high level), ensuring that the N-type switch tube Q1 is turned on.

[0066] After the N-type switch tube Q1 is turned on, the gate of the PMOS tube Q2 is grounded (i.e., the gate of the PMOS tube Q2 is at a low level), and the PMOS tube Q2 is turned on. At this time, the first voltage output by the voltage regulator chip U1 not only supplies power to the single-chip microcomputer, but also supplies power to the low-current communication module through the first resistor R1, the PMOS tube Q2, and the second resistor R2 in sequence.

[0067] In addition, if the product needs to be upgraded OTA (Over-The-Air Technology) to fix the BUG, ​​the MCU will be reset during the OTA upgrade, causing the potential of the MCU_IO pin to be pulled down. However, after the MCU is powered on, the low-current communication module connected to the MCU is also powered on, thereby raising the potential of the MD1_IO pin. Therefore, during the product OTA upgrade, the MCU_IO pin is at a low level and the MD1_IO pin is at a high level. Under the action of the first diode D1 and the second diode D2, point A is still at a high level. The MD1_IO pin potential can maintain the normal operation of the N-type switch tube Q1 and the PMOS tube Q2, thereby completing the OTA upgrade of the product.

[0068] See also Figure 6 When the single-chip microcomputer is connected to the high-current communication module, the low-current control module 120 is turned off (i.e., Q1, R1, R2, R6, and R7 are all empty). The power supply voltage VIN is stepped down to a first voltage (e.g., 3.3V) through the voltage regulator chip U1 to power the single-chip microcomputer. After the single-chip microcomputer is powered on, the potential of the MCU_IO pin is raised, so that point A (i.e., the output end of the interface module) is at a high level, thereby pulling up the enable end EN of the DC-DC buck converter U2, so that the DC-DC buck converter U2 starts working and steps down the power supply voltage VIN to a second voltage (e.g., 3.8V).

[0069] Since R1, R2, Q1, R6, and R7 are all empty at this time, the gate of the PMOS tube Q2 is connected to the cathode of the third diode D3 through the fourth resistor R4. In addition to supplying power to the single-chip microcomputer, the first voltage output by the voltage regulator chip U1 will also sequentially pull up the gate potential of the PMOS tube Q2 through the third diode D3 and the fourth resistor R4 (that is, the gate of the PMOS tube Q2 is at a high level), so that the PMOS tube Q2 is cut off. The second voltage output by the DC-DC buck converter U2 sequentially supplies power to the high-current communication module through the body diode in the PMOS tube Q2 and the third resistor R3.

[0070] That is, when the single-chip microcomputer is connected to the low-current communication module, the high-current control module 130 is turned off, the PMOS tube Q2 is turned on, and the first voltage is output to the power supply terminal MD1_VDD of the low-current communication module through the PMOS tube Q2 (i.e., from the source to the drain of the PMOS tube Q2). When the single-chip microcomputer is connected to the high-current communication module, the low-current control module 120 is turned off, the PMOS tube Q2 is turned off, and the second voltage is output to the power supply terminal MD2_VDD of the high-current communication module through the body diode in the PMOS tube Q2 (i.e., from the drain to the source of the PMOS tube Q2).

[0071] Similarly, when the product is OTA upgraded, the microcontroller will reset, causing the potential of the MCU_IO pin to be pulled down. However, after the microcontroller is powered on, the high-current communication module connected to the microcontroller is also powered on, thereby pulling up the potential of the MD2_IO pin. Therefore, during the product OTA upgrade process, the MCU_IO pin is low level, the MD2_IO pin is high level, and under the action of the first diode D1 and the second diode D2, point A is still high level. The MD2_IO pin potential can maintain the normal operation of the DC-DC buck converter U2, thereby completing the OTA upgrade of the product.

[0072] It should be noted that when the single chip microcomputer is connected to the high current communication module, the third diode D3 has the following functions:

[0073] First, prevent the second voltage from flowing back to the power supply terminal MCU_VDD of the single-chip computer. Since the first voltage is lower than the second voltage, the third diode D3 can prevent the high voltage (i.e., the second voltage) output by the DC-DC buck converter U2 from flowing back to the power supply terminal MCU_VDD of the single-chip computer, thereby damaging the single-chip computer.

[0074] Second, reduce power consumption. Figure 7 When the product is dormant, the single chip microcomputer will turn off the DC-DC buck converter U2. The first voltage directly supplies power to the high current communication module through the third diode D3 and the third resistor R3 to maintain the low power standby requirement of the high current communication module, thereby reducing power consumption.

[0075] Optionally, an embodiment of the present application further provides a power supply system for a communication module, the system comprising a power supply circuit 10 for a communication module as described in any of the aforementioned implementations.

[0076] In summary, the embodiments of the present application provide a power supply circuit and system for a communication module. According to the type of communication module, it is only necessary to turn off the high current control module or the low current control module (i.e., leave it empty), and output the corresponding voltage to power the high current communication module or the low current communication module, thereby realizing fast switching of different types of communication modules on products (for example, a sphygmomanometer or other electronic products). The power supply circuit does not need to modify the control logic of each device, has the characteristics of few devices, simple circuit structure, and flexible current regulation, reduces the area of ​​the PCB board, and greatly reduces the production cost.

[0077] In addition, the "OR gate" circuit composed of the first diode and the second diode can realize the product OTA autonomous upgrade. The third diode can realize the requirement of maintaining low power consumption of the high-current communication module when the product is dormant.

[0078] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0079] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A power supply circuit for a communication module, characterized in that: The power supply circuit of the communication module includes: a voltage stabilizing module, a small current control module, a large current control module and an output module; The input end of the voltage stabilizing module and the input end of the high current control module are both connected to the power supply end, the output end of the voltage stabilizing module is respectively connected to the power supply end of the single chip microcomputer, the low current control module and the high current control module, and the output module is respectively connected to the low current control module and the high current control module; wherein the communication module includes a high current communication module and a low current communication module, and the single chip microcomputer is used to connect to the low current communication module or the high current communication module according to the switching instruction; When the single chip microcomputer is connected to the low current communication module, the high current control module is turned off, and the output module is used to output the first voltage output by the voltage stabilizing module to the power supply end of the low current communication module under the control of the low current control module; When the single-chip microcomputer is connected to the high-current communication module, the low-current control module is turned off, and the output module is used to output the second voltage output by the high-current control module to the power supply end of the high-current communication module under the control of the high-current control module; wherein the first voltage is less than the second voltage.

2. The power supply circuit of the communication module according to claim 1, characterized in that: The power supply circuit of the communication module further includes an interface module, and the interface module outputs a high level according to the power-on status of the single-chip microcomputer and the communication module to activate the large current control module or the small current control module.

3. The power supply circuit of the communication module according to claim 2, characterized in that: The interface module includes a first diode and a second diode; the anode of the first diode is connected to the input and output pins of the single-chip microcomputer, the anode of the second diode is connected to the input and output pins of the communication module, and the cathode of the first diode and the cathode of the second diode are connected to the small current control module and the large current control module.

4. The power supply circuit of the communication module according to claim 3, characterized in that: The small current control module includes a first resistor, a second resistor and an N-type switch tube; One end of the first resistor is connected to the output end of the voltage stabilizing module, the other end of the first resistor is connected to the first port of the output module, the second port of the output module is connected to the power supply end of the low current communication module through the second resistor, the third port of the output module is connected to the first port of the N-type switch tube, the second port of the N-type switch tube is grounded, and the third port of the N-type switch tube is respectively connected to the cathode of the first diode and the cathode of the second diode.

5. The power supply circuit of the communication module according to claim 4, characterized in that: The N-type switch tube is an NPN transistor or an NMOS tube.

6. The power supply circuit of the communication module according to claim 3, characterized in that: The high current control module includes a third diode, a third resistor and a voltage conversion unit; The anode of the third diode is connected to the output end of the voltage stabilizing module, and the cathode of the third diode is connected to the first port of the output module; the input end of the voltage conversion unit is connected to the power supply end, the enable end of the voltage conversion unit is respectively connected to the cathode of the first diode and the cathode of the second diode, and the output end of the voltage conversion unit is connected to the second port of the output module; the first port of the output module is also connected to the power supply end of the high current communication module through the third resistor.

7. The power supply circuit of the communication module according to claim 6, characterized in that: The voltage conversion unit includes a DC-DC buck converter and an inductor; the input end of the DC-DC buck converter is connected to the power supply end, the enable end of the DC-DC buck converter is respectively connected to the cathode of the first diode and the cathode of the second diode, and the output end of the DC-DC buck converter is connected to the second port of the output module through the inductor; the DC-DC buck converter is used to convert the power supply voltage into the second voltage.

8. The power supply circuit of the communication module according to claim 4 or 6, characterized in that: The output module includes a PMOS tube and a fourth resistor; the first port of the output module is the source of the PMOS tube, the second port of the output module is the drain of the PMOS tube, and the third port of the output module is the gate of the PMOS tube; one end of the fourth resistor is connected to the source of the PMOS tube, and the other end of the fourth resistor is connected to the gate of the PMOS tube; When the single chip microcomputer is connected to the low current communication module, the high current control module is turned off, the PMOS tube is turned on, and the first voltage is output to the power supply end of the low current communication module through the PMOS tube; When the single chip microcomputer is connected to the high current communication module, the low current control module is turned off, the PMOS tube is cut off, and the second voltage is output to the power supply end of the high current communication module through the body diode in the PMOS tube.

9. The power supply circuit of the communication module according to claim 1, characterized in that: The voltage stabilizing module includes a voltage stabilizing chip and a fifth resistor; the input end of the voltage stabilizing chip is connected to the power supply end, the enable end of the voltage stabilizing chip is connected to the power supply end through the fifth resistor, and the output end of the voltage stabilizing chip is respectively connected to the power supply end of the microcontroller, the large current control module and the small current control module; the voltage stabilizing chip is used to convert the power supply voltage into the first voltage.

10. A power supply system for a communication module, characterized in that: The power supply system of the communication module comprises the power supply circuit of the communication module according to any one of claims 1 to 9.

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