Power supply circuit and sphygmomanometer

Abstract

The utility model relates to a power supply circuit and a sphygmomanometer and relates to the technical field of sphygmomanometer power supply. The power supply circuit comprises a power supply interface, an oscillography module and an auscultation module, the oscillography module comprises a first control unit, and the auscultation module comprises a switch unit and a second control unit; the power supply interface is connected with the oscillography module; the switch unit is connected with the power supply interface, the first control unit and the second control unit; wherein the switch unit is controlled by the first control unit so as to cut off / conduct the power supply of the second control unit. Therefore, the power supply of the auscultation module is independently arranged, the power supply of the auscultation module can be controlled to be switched on / off through the first control unit of the oscillography module, when the auscultation module is damaged, the power supply of the auscultation module is switched off, and the use of the oscillography module is not influenced at all.

Description

TECHNICAL FIELD

[0001] The utility model relates to sphygmomanometer power supply technical field especially, relate to a kind of power supply circuit and sphygmomanometer. BACKGROUND

[0002] Sphygmomanometer can measure blood pressure, and it is a commonly used medical instrument.

[0003] The method of blood pressure measurement includes oscillograph and auscultation method, and the above two methods have advantages and disadvantages, and medical staff can choose according to actual needs.

[0004] In order to facilitate user selection, the sphygmomanometer based on oscillograph also has auscultation circuit at present, so that users can switch to select using oscillograph or auscultation method to measure blood pressure. However, the oscillograph circuit cannot be used after the damage of the auscultation circuit in the above sphygmomanometer. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of power supply circuit, to solve the problem that, in existing sphygmomanometer, after the damage of auscultation method circuit, it will lead to oscillograph circuit also cannot be used.

[0006] In the first aspect, the utility model provides a kind of power supply circuit, and the power supply circuit includes power supply interface, oscillograph module and auscultation method module, and the oscillograph module includes first control unit, and the auscultation method module includes switch unit and second control unit;

[0007] The power supply interface is connected with the oscillograph module;The switch unit is connected with the power supply interface, the first control unit and the second control unit;Wherein, the switch unit is controlled by the first control unit, to cut off / conduct the power supply of the second control unit.

[0008] Further technical solutions are that the switch unit includes NPN triode and PMOS tube, the base of the NPN triode is connected with the first control unit, the collector of the NPN triode is connected with the gate of the PMOS tube, and the emitter of the NPN triode is grounded;The source of the PMOS tube is connected with the power supply interface, and the drain of the PMOS tube is connected with the second control unit.

[0009] Further technical solutions are that the switch unit also includes first resistance and second resistance, one end of the first resistance is connected with the source of the PMOS tube, the other end of the second resistance is connected with the gate of the PMOS tube and the second resistance, and the second resistance is connected with the collector of the NPN triode.

[0010] Further, the switch unit further comprises a third resistor, and the base of the NPN triode is connected with the first control unit through the third resistor.

[0011] Further, the switch unit further comprises a fourth resistor, and the base of the NPN triode is grounded through the fourth resistor.

[0012] Further, the power supply circuit further comprises a reverse current protection unit, and the power supply interface is connected with the switch unit through the reverse current protection unit.

[0013] Further, the power supply circuit further comprises a voltage reduction unit, and the switch unit is connected with the second control unit through the voltage reduction unit.

[0014] Further, the voltage reduction unit comprises an inductor, a first capacitor, a second capacitor, a DC-DC converter, a third capacitor and a fourth capacitor; the inductor is connected with the switch unit and an input end of the DC-DC converter, an output end of the DC-DC converter is connected with the second control unit; the first capacitor and the second capacitor are connected with the input end of the DC-DC converter and grounded; the third capacitor and the fourth capacitor are connected with the output end of the DC-DC converter and grounded.

[0015] Further, the voltage reduction unit further comprises an electrostatic protection tube, and the electrostatic protection tube is connected with the input end of the DC-DC converter and grounded.

[0016] In the second aspect, the utility model provides a sphygmomanometer, the sphygmomanometer includes the power supply circuit of as the first aspect.

[0017] Compared with the prior art, the above technical scheme provided by the utility model has the following advantages:

[0018] In the technical scheme of the utility model, the power supply circuit comprises a power supply interface, an oscillograph method module and an auscultation method module, the oscillograph method module comprises a first control unit, the auscultation method module comprises a switch unit and a second control unit, the power supply interface is connected with the oscillograph method module, the switch unit is connected with the power supply interface, the first control unit and the second control unit, and wherein the switch unit is controlled by the first control unit to cut off / conduct the power supply of the second control unit. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, simple descriptions will be given to the drawings needed to be used in the embodiments or prior art descriptions. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0021] One or more embodiments are exemplarily illustrated by the pictures in the drawings corresponding to the embodiments, and these exemplary illustrations do not constitute a limitation to the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the drawings do not constitute a proportional limitation unless specifically stated.

[0022] Figure 1 A structural block diagram of a power supply circuit provided for the embodiment of the present application;

[0023] Figure 2 Another structural block diagram of a power supply circuit provided for the embodiment of the present application;

[0024] Figure 3 A structural block diagram of a power supply circuit provided for the embodiment of the present application;

[0025] Figure 4 A circuit diagram of a power supply circuit provided for the embodiment of the present application.

[0026] Explanation of reference numerals:

[0027] Power supply interface 10, oscillography method module 20, auscultation method module 30, first control unit 21, LDO module 22, electromagnetic valve 23, air pump 24, pressure sensor 25, air bag 26, switch unit 31, second control unit 32, reverse flow protection unit 33, voltage reduction unit 34, audio signal processing circuit 35, NPN triode Q10, PMOS tube Q22, first resistor R147, second resistor R148, third resistor R145, fourth resistor R146, inductor L12, first capacitor EC22, second capacitor C17, DC-DC converter U1, third capacitor C28, fourth capacitor EC23, electrostatic protection tube ED33, diode D20. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0029] The following disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. For simplicity of the disclosure, the description below of the components and arrangement of specific examples is provided. It is understood that they are merely examples and are not intended to limit the utility model. Moreover, the utility model can repeat reference numerals and / or letters in different examples. Such repetition is for simplicity and clarity and does not itself dictate a relationship between the various embodiments and / or arrangements discussed.

[0030] For the convenience of description, spatial relative terms can be used in the description to describe the relative position relationship or movement condition of one element or feature relative to another element or feature as shown in the drawings, such as "internal", "external", "inboard", "outboard", "under", "below", "on", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawing is flipped over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both the up and down positions. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the description are interpreted accordingly.

[0031] In order to solve the technical problem that after the auscultation method circuit is damaged, the oscillography method circuit cannot be used in the sphygmomanometer, the utility model provides a power supply circuit, in the power supply circuit, the power supply of the auscultation method module is independently arranged, the power supply of the auscultation method module can be controlled to be turned on / shut off through the first control unit of the oscillography method module, even if the auscultation method module is damaged, the use of the oscillography method module will not be affected.

[0032] Referring to Figures 1-4 , the utility model embodiment provides a power supply circuit, the power supply circuit includes power supply interface 10, oscillography method module 20 and auscultation method module 30, and the specific structure is introduced as follows:

[0033] The power supply interface 10 can be a power supply port of an internal battery or a power supply interface for connecting an external power supply, for example, an adapter interface for connecting an adapter, and the utility model is not limited in particular.

[0034] The oscillometric method module 20 is a circuit module for realizing the oscillometric method to measure blood pressure, and can specifically include an LDO module 22 and a first control unit 21. The LDO module 22 is used to convert the voltage of the power supply interface 10 into a voltage suitable for the first control unit 21. The first control unit 21 is connected with a solenoid valve 23, an air pump 24 and a pressure sensor 25. The air pump 24 is connected with an air bag 26, and the solenoid valve 23 and the pressure sensor 25 are arranged on the air bag 26. The air pump 24 inflates the air bag 26, the solenoid valve 23 deflates the air bag 26, and the pressure information in the air bag 26 is obtained through the pressure sensor 25, and the air bag 26 is wrapped on the arm. The power supply interface 10 is connected with the oscillometric method module 20. Specifically, the power supply interface 10 is connected with the LDO module 22, and is used to supply power to the oscillometric method module 20.

[0035] The auscultation method module 30 is a circuit module for realizing the auscultation method to measure blood pressure. The auscultation method module 30 includes a switch unit 31 and a second control unit 32.

[0036] In the utility model embodiment, the switch unit 31 is connected with the power supply interface 10, the first control unit 21 and the second control unit 32; wherein the switch unit 31 is controlled by the first control unit 21 to cut off / conduct the power supply of the second control unit 32.

[0037] Specifically, the switch unit 31 can be controlled to be turned on / off through the first control unit 21. When the switch unit 31 is turned on, the power supply interface 10 can supply power to the auscultation method module 30; when the switch unit 31 is turned off, the power supply interface 10 stops supplying power to the auscultation method module 30. Therefore, when the auscultation method module 30 is damaged, the power supply to the auscultation method module 30 can be cut off, and the use of the oscillometric method module 20 is not affected at all.

[0038] Further, the second control unit 32 is connected with an audio signal processing circuit 35 in the auscultation method module 30, and the audio signal processing circuit 35 refers to a circuit for processing the audio signal required by the auscultation method, and the utility model is not limited in particular. The audio signal processing circuit 35 collects the audio signal of arterial blood flow, and outputs the processed audio signal to the second control unit 32, and the second control unit 32 obtains blood pressure related data through the auscultation method algorithm. Further, the second control unit 32 is connected with the first control unit 21, for example, through a serial port circuit to realize communication between the two, and the utility model is not limited in particular.

[0039] The technical scheme of the utility model embodiment, the power supply circuit includes power supply interface 10, oscillograph method module 20 and auscultation method module 30, the oscillograph method module 20 includes first control unit 21, the auscultation method module 30 includes switch unit 31 and second control unit 32, the power supply interface 10 is connected with the oscillograph method module 20, the switch unit 31 is connected with the power supply interface 10, the first control unit 21 and the second control unit 32, wherein, the switch unit 31 is controlled to the first control unit 21, to cut off / the power supply of the second control unit 32 is conducted. Visible, the power supply of auscultation method module 30 is independently set, and the first control unit 21 of oscillograph method module 20 can control the power supply of the auscultation method module 30 to be conducted / cut off, when the auscultation method module 30 is damaged, cutting off the power supply of the auscultation method module 30 can, completely will not affect the use of oscillograph method module 20.

[0040] Further, in some embodiments, the switch unit 31 includes NPN triode Q10 and PMOS tube Q22, the base of the NPN triode Q10 is connected with the first control unit 21, the collector of the NPN triode Q10 is connected with the gate of the PMOS tube Q22, and the emitter of the NPN triode Q10 is grounded;The source of the PMOS tube Q22 is connected with the power supply interface 10, and the drain of the PMOS tube Q22 is connected with the second control unit 32.

[0041] Specifically, the base of the NPN triode Q10 is connected with the signal pin of the first control unit 21, and the first control unit 21 controls the NPN triode Q10 to be conducted / turned off by outputting different signals. When the NPN triode Q10 is conducted, the PMOS tube Q22 is conducted, and at this time, the power supply of the auscultation method module 30 is conducted. When the NPN triode Q10 is disconnected, the PMOS tube Q22 is disconnected, and at this time, the power supply of the auscultation method module 30 is stopped.

[0042] Further, the switch unit 31 further includes first resistance R147 and second resistance R148, one end of the first resistance R147 is connected with the source of the PMOS tube Q22, the other end of the second resistance R148 is connected with the gate of the PMOS tube Q22 and the second resistance R148, and the second resistance R148 is connected with the collector of the NPN triode Q10.

[0043] Specifically, the first resistor R147 and the second resistor R148 play a role of voltage division. When the NPN transistor Q10 is turned on, the voltage at the gate of the PMOS transistor Q22 is lower than the voltage at the source of the PMOS transistor Q22 due to the voltage division of the first resistor R147 and the second resistor R148. At this time, the source-to-drain of the PMOS transistor Q22 is turned on to supply power to the auscultation module 30. For example, in an embodiment, the resistance of the first resistor R147 is 10 times the resistance of the second resistor R148. Thus, the voltage at the gate of the PMOS transistor Q22 is 1 / 11 of the voltage at the source of the PMOS transistor Q22.

[0044] Further, the switch unit 31 further comprises a third resistor R145. The base of the NPN transistor Q10 is connected to the first control unit 21 through the third resistor R145.

[0045] Specifically, the third resistor R145 plays a role of current limiting, which can effectively avoid excessive current and improve safety.

[0046] Further, the switch unit 31 further comprises a fourth resistor R146. The base of the NPN transistor Q10 is grounded through the fourth resistor R146.

[0047] Specifically, the fourth resistor R146 plays a role of raising the voltage at the base of the NPN transistor Q10, which ensures that the NPN transistor Q10 can be reliably turned on.

[0048] Further, in some embodiments, such as the present embodiment, the power supply circuit further comprises the reverse current protection unit 33. The power supply interface 10 is connected to the switch unit 31 through the reverse current protection unit 33.

[0049] Specifically, the reverse current protection unit 33 is used to make the current flow in one direction, avoiding current backflow and improving safety. The reverse current protection unit 33 can specifically comprise a diode D20. The anode of the diode D20 is connected to the power supply interface 10, and the cathode of the diode D20 is connected to the source of the PMOS transistor Q22.

[0050] Further, in some embodiments, such as the present embodiment, the power supply circuit further comprises a voltage reduction unit 34. The switch unit 31 is connected to the second control unit 32 through the voltage reduction unit 34. The voltage reduction unit 34 can convert the voltage of the power supply interface 10 into a voltage suitable for the second control unit 32.

[0051] Specifically, the voltage reduction unit 34 comprises an inductor L12, a first capacitor EC22, a second capacitor C17, a DC-DC converter U1, a third capacitor C28 and a fourth capacitor EC23; the inductor L12 is connected with the switch unit 31 (specifically, the drain of the PMOS tube Q22) and the input end of the DC-DC converter U1, the output end of the DC-DC converter U1 is connected with the second control unit 32; the first capacitor EC22 and the second capacitor C17 are connected with the input end of the DC-DC converter U1 and grounded; the third capacitor C28 and the fourth capacitor EC23 are connected with the output end of the DC-DC converter U1 and grounded. The ground end of the DC-DC converter U1 is grounded.

[0052] In specific implementation, the DC-DC converter U1 can play a role of voltage conversion, and the inductor L12, the first capacitor EC22, the second capacitor C17, the third capacitor C28 and the fourth capacitor EC23 can improve the stability of the circuit, so that the voltage output by the voltage reduction unit 34 is more stable, thereby improving the reliability of power supply. The first capacitor EC22 and the fourth capacitor EC23 can be electrolytic capacitors.

[0053] Further, the voltage reduction unit 34 further comprises an electrostatic protection tube ED33 connected with the input end of the DC-DC converter U1 and grounded.

[0054] Specifically, the electrostatic protection tube ED33 can be a bidirectional TVS tube, which plays a role of surge and electrostatic protection.

[0055] Referring to Figure 4 , the power supply principle of the power supply circuit is as follows:

[0056] Figure 4 VCC_6V is the voltage input through the power supply interface 10 when the adapter normally works; DC5V_MUC2 is the voltage for upgrading, which is not used in normal work; MCU2_VCC is the voltage for powering the work of the stethoscope module 30 in the rear stage; J25 and J23 are terminal blocks, and the two terminal blocks J25 and J23 are connected together in one-to-one correspondence through wires in the horizontal direction; MCU2_EN is the control port of the first control unit 21; MCU2_RX and MCU2_TX are communication serial ports for communication between the second control unit 32 and the first control unit 21; USBDP1 and USBDM1 are upgrading communication serial ports of the second control unit 32.

[0057] When the first control unit 21 receives the operation instruction of the user for supplying power to the oscillography module 20, the control port MCU2_EN voltage is changed from 0V to 3.3V, the NPN transistor Q10 base voltage is changed to be high and turned on, the PMOS tube Q22 gate voltage is divided by the first resistor R147 and the second resistor R148, and the voltage value is smaller than the source voltage, for example, in the embodiment, the voltage value is 1 / 11 of the source voltage, therefore, the source to drain of the PMOS tube Q22 is in the on state, at the same time, the MCU2_VCC is also changed from 0V to 3.6V, and the power supply to the stethoscope module 30 in the rear stage is supplied. When the first control unit 21 receives the operation instruction of the user for cutting off the power supply to the oscillography module 20, the control port MCU2_EN voltage is changed from 3.3V to 0, the NPN transistor Q10 and the PMOS tube Q22 are cut off, and the power supply to the oscillography module 20 is cut off.

[0058] The utility model embodiment provides a sphygmomanometer, the sphygmomanometer includes the power supply circuit provided by any one of the above embodiments.

[0059] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0060] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, and therefore cannot be understood as a limitation on the utility model.

[0061] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0062] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0065] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

[0066] The above description describes specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A power supply circuit, characterized in that, It includes a power supply interface, an oscilloscope module, and an auscultation module. The oscilloscope module includes a first control unit, and the auscultation module includes a switching unit and a second control unit. The power supply interface is connected to the oscilloscope module; the switching unit is connected to the power supply interface, the first control unit, and the second control unit; wherein the switching unit is controlled by the first control unit to cut off / turn on the power supply to the second control unit.

2. The power supply circuit according to claim 1, characterized in that, The switching unit includes an NPN transistor and a PMOS transistor. The base of the NPN transistor is connected to the first control unit, the collector of the NPN transistor is connected to the gate of the PMOS transistor, and the emitter of the NPN transistor is grounded. The source of the PMOS transistor is connected to the power supply interface, and the drain of the PMOS transistor is connected to the second control unit.

3. The power supply circuit according to claim 2, characterized in that, The switching unit further includes a first resistor and a second resistor. One end of the first resistor is connected to the source of the PMOS transistor, and the other end of the second resistor is connected to the gate of the PMOS transistor and the second resistor. The second resistor is connected to the collector of the NPN transistor.

4. The power supply circuit according to claim 2, characterized in that, The switching unit further includes a third resistor, through which the base of the NPN transistor is connected to the first control unit.

5. The power supply circuit according to claim 2, characterized in that, The switching unit also includes a fourth resistor, through which the base of the NPN transistor is grounded.

6. The power supply circuit according to claim 1, characterized in that, The power supply circuit also includes a reverse current protection unit, and the power supply interface is connected to the switching unit through the reverse current protection unit.

7. The power supply circuit according to claim 1, characterized in that, The power supply circuit also includes a step-down unit, and the switching unit is connected to the second control unit through the step-down unit.

8. The power supply circuit according to claim 7, characterized in that, The step-down unit includes an inductor, a first capacitor, a second capacitor, a DC-DC converter, a third capacitor, and a fourth capacitor; the inductor is connected to the input terminal of the switching unit and the DC-DC converter, and the output terminal of the DC-DC converter is connected to the second control unit; the first capacitor and the second capacitor are connected to the input terminal of the DC-DC converter and grounded; the third capacitor and the fourth capacitor are connected to the output terminal of the DC-DC converter and grounded.

9. The power supply circuit according to claim 8, characterized in that, The step-down unit also includes an electrostatic discharge (ESD) tube, which is connected to and grounded at the input terminal of the DC-DC converter.

10. A blood pressure monitor, characterized in that, The blood pressure monitor includes a power supply circuit as described in any one of claims 1-9.

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