Alarm control circuit and medical equipment

Abstract

The utility model relates to the technical field of electronics, in particular to an alarm control circuit and medical equipment. The alarm control circuit comprises a first alarm signal output circuit, a second alarm signal output circuit and a waveform adjusting circuit, and the first alarm signal output circuit outputs harmonic signals to the input end of the waveform adjusting circuit according to power supply signals. The first alarm signal output circuit outputs a harmonic signal, the second alarm signal output circuit outputs a fundamental wave signal to the control end of the waveform adjusting circuit according to a power supply signal, and the fundamental wave signal generated by the second alarm signal output circuit is used for controlling the harmonic signal generated by the first alarm signal output circuit. The output end of the waveform adjusting circuit outputs auditory alarm signals meeting the YY0709-2009 parallel standard, the overall circuit power consumption is reduced, meanwhile, the requirement for a back-up power source is reduced, and the product cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the field of electronic technology, in particular to an alarm control circuit and medical equipment. Background Art

[0002] Medical devices refer to instruments, equipment, appliances, materials, software and other items used for medical purposes, either alone or in combination, on the human body to diagnose, treat, prevent, monitor diseases, and to replace, regulate, and compensate for human structure or function. These devices are widely used in hospitals, clinics, home care environments, and scientific research and teaching institutions.

[0003] The alarm signal in medical equipment should comply with the YY0709-2009 parallel standard. In the prior art, a processor is usually used to control the alarm of the device, but the processor has high power consumption. When the device needs to alarm for power failure, the power provided by the conventional farad capacitor is not enough to support the alarm duration requirement. Using a battery as a backup power supply brings about problems related to transportation and certification, thereby increasing additional expenses. Therefore, there is a need to improve the alarm circuit in the relevant technology. Utility Model Content

[0004] The embodiments of the utility model provide an alarm control circuit and a medical device to solve the problem in the prior art that the MCU power consumption is high and cannot meet the requirement of power-off alarm when controlling the alarm of the device using the MCU.

[0005] In the first aspect, the utility model provides an alarm control circuit, comprising: a first alarm signal output circuit, a second alarm signal output circuit and a waveform adjustment circuit, the input end of the first alarm signal output circuit is used to input a power supply signal, the input end of the second alarm signal output circuit is used to input the power supply signal, the output end of the first alarm signal output circuit is connected to the input end of the waveform adjustment circuit, the output end of the second alarm signal output circuit is connected to the control end of the waveform adjustment circuit, and the waveform adjustment circuit is used to adjust the harmonic signal input to its input end according to the fundamental wave signal input to its control end, and output an auditory alarm signal.

[0006] In one embodiment, the first alarm signal output circuit includes: a first alarm signal generating module and a first alarm signal switching module, the input end of the first alarm signal generating module is used to input the power supply signal, the output end of the first alarm signal generating module is connected to the normally open input end of the first alarm signal switching module, the normally closed input end of the first alarm signal switching module is used to connect to the harmonic signal output end of the processor, the output end of the first alarm signal switching module is connected to the input end of the waveform adjustment circuit, and the control end of the first alarm signal switching module is used to connect to the first power supply.

[0007] In one embodiment, the second alarm signal output circuit includes: a second alarm signal generating module and a second alarm signal switching module, the input end of the second alarm signal generating module is used to input the power supply signal, the output end of the second alarm signal generating module is connected to the normally open input end of the second alarm signal switching module, the normally closed input end of the second alarm signal switching module is used to connect to the fundamental signal output end of the processor, the output end of the second alarm signal switching module is connected to the control end of the waveform adjustment circuit, and the control end of the second alarm signal switching module is used to connect to the first power supply.

[0008] In one embodiment, the waveform adjustment circuit includes: a first RC filter branch, a second RC filter branch and a first switch tube, the input end of the first RC filter branch is connected to the output end of the first alarm signal output circuit, the output end of the first RC filter branch is connected to the input end of the second RC filter branch, the output end of the second RC filter branch is used to output the auditory alarm signal, the output end of the second RC filter branch is connected to the input end of the first switch tube, the output end of the first switch tube is grounded, and the control end of the first switch tube is connected to the output end of the second alarm signal output circuit.

[0009] In one embodiment, the first alarm signal switching module includes: a first voltage divider circuit and a first single-pole double-throw analog switch, the input end of the first voltage divider circuit is used to connect to the first power supply, the first output end of the first voltage divider circuit is grounded, the second output end of the first voltage divider circuit is connected to the control end of the first single-pole double-throw analog switch, the normally open input end of the first single-pole double-throw analog switch is connected to the output end of the first alarm signal generating module, the normally closed input end of the first single-pole double-throw analog switch is used to connect to the harmonic signal output end of the processor, and the output end of the single-pole double-throw analog switch is connected to the input end of the waveform adjustment circuit.

[0010] In one embodiment, the second alarm signal switching module includes: a second voltage divider circuit and a second single-pole double-throw analog switch, the input end of the second voltage divider circuit is used to connect to the first power supply, the first output end of the second voltage divider circuit is grounded, the second output end of the second voltage divider circuit is connected to the control end of the second single-pole double-throw analog switch, the normally open input end of the second single-pole double-throw analog switch is connected to the output end of the second alarm signal generating module, the normally closed input end of the second single-pole double-throw analog switch is used to connect to the fundamental signal output end of the processor, and the output end of the second single-pole double-throw analog switch is connected to the control end of the waveform adjustment circuit.

[0011] In one embodiment, the first alarm signal generating module includes: a first voltage dividing branch, a first energy storage branch, a first positive feedback branch, a first negative feedback branch and a first comparator, the input end of the first voltage dividing branch is used for the power supply signal, the first output end of the first voltage dividing branch is connected to the positive input end of the first comparator, the second output end of the first voltage dividing branch is grounded, one end of the first energy storage branch is connected to the inverting input end of the first comparator, the other end of the first energy storage branch is grounded, the input end of the first positive feedback branch is connected to the output end of the first comparator, the output end of the first positive feedback branch is connected to the positive input end of the first comparator, the input end of the first negative feedback branch is connected to the output end of the first comparator, the output end of the first negative feedback branch is connected to the inverting input end of the first comparator, and the output end of the first comparator is connected to the normally open input end of the first alarm signal switching module.

[0012] In one embodiment, the alarm control circuit also includes: a power supply control circuit, which includes: a power supply branch, an energy storage branch, a power supply control branch, a voltage stabilizing branch and a power supply selection branch, the input end of the power supply branch is used to connect the first power supply, the output end of the power supply branch is connected to the input end of the energy storage branch, the output end of the energy storage branch is connected to the input end of the power supply control branch, the output end of the power supply control branch is connected to the input end of the voltage stabilizing branch, the control end of the power supply control branch is connected to the first power supply through a first protection circuit, the control end of the power supply control branch is grounded through a second protection circuit, the output end of the voltage stabilizing branch is connected to the first input end of the power supply selection branch, the second input end of the power supply selection branch is used to connect the first power supply, and the output end of the power supply selection branch is used to output the power supply signal.

[0013] In one embodiment, the alarm control circuit also includes: an alarm circuit, the alarm circuit includes: a power amplifier module and a speaker, the audio signal input end of the power amplifier module is used to input an auditory alarm signal, the audio signal output end of the power amplifier module is used to connect the speaker, the enable control pin of the power amplifier module is used to connect the enable control signal output end of the processor, and the enable control pin of the power amplifier module inputs the power supply signal through a third protection circuit.

[0014] In a second aspect, this embodiment provides a medical device, which includes the alarm control circuit as described in the first aspect and its improvement.

[0015] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0016] The alarm control circuit of the utility model comprises: a first alarm signal output circuit, a second alarm signal output circuit and a waveform adjustment circuit. The input end of the first alarm signal output circuit inputs a power supply signal, the output end of the first alarm signal output circuit outputs a harmonic signal to the input end of the waveform adjustment circuit, the input end of the second alarm signal output circuit inputs a power supply signal, and the output end of the second alarm signal output current outputs a fundamental wave signal to the control end of the waveform adjustment circuit. The alarm control circuit of the utility model uses the fundamental wave signal generated by the second alarm signal output circuit to control the harmonic signal generated by the first alarm signal output circuit, so that the output end of the waveform adjustment circuit outputs an auditory alarm signal that complies with the YY0709-2009 parallel standard, which reduces the overall circuit power consumption while reducing the requirements for backup power supply, greatly reducing the cost of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the module structure of an alarm control circuit provided by an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the time characteristics of the auditory alarm signal provided by an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the module structure of an alarm control circuit provided by an embodiment of the utility model;

[0021] Figure 4 This is a circuit connection diagram of a waveform adjustment circuit provided by an embodiment of the utility model;

[0022] Figure 5 It is a timing diagram of a harmonic signal and a fundamental wave signal provided by an embodiment of the utility model;

[0023] Figure 6 This is a circuit connection diagram of a first alarm signal switching module provided by an embodiment of the utility model;

[0024] Figure 7 This is a circuit connection diagram of a first alarm signal switching module provided by an embodiment of the utility model;

[0025] Figure 8 This is a circuit connection diagram of a first alarm signal generating module provided by an embodiment of the utility model;

[0026] Fig. 9 This is a circuit connection diagram of a power supply control circuit provided by an embodiment of the utility model;

[0027] Fig.10 This is a circuit connection diagram of an alarm circuit provided by an embodiment of the utility model;

[0028] Among them, 1. a first alarm signal output circuit, 2. a second alarm signal output circuit, 3. a waveform adjustment circuit, 4. a processor, 5. a power supply control circuit, 6. an alarm circuit, 11. a first alarm signal generating module, 12. a first alarm signal switching module, 21. a second alarm signal generating module, 22. a second alarm signal switching module, 31. a first RC filter branch, 32. a second RC filter branch, 51. a power supply branch, 52. an energy storage branch, 53. a power supply control branch, 54. a voltage stabilizing branch, 55. a power supply selection branch, 61. an amplifier module, 62. a speaker, 63. a third protection circuit, 111. a first voltage dividing branch, 112. a first energy storage branch, 113. a first positive feedback branch, 114. a first negative feedback branch, 121. a first voltage dividing circuit, 221. a second voltage dividing circuit, 531. a first protection circuit, 532. a second protection circuit. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In order to thoroughly understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0033] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosure belongs. It will be further understood that the terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0034] In one embodiment, if Figure 1 As shown, a module structure schematic diagram of an alarm control circuit is provided, including: a first alarm signal output circuit 1, a second alarm signal output circuit 2 and a waveform adjustment circuit 3, the input end of the first alarm signal output circuit 1 is used to input a power supply signal, the input end of the second alarm signal output circuit 2 is used to input the power supply signal, the output end of the first alarm signal output circuit 1 is connected to the input end of the waveform adjustment circuit 3, the output end of the second alarm signal output circuit 2 is connected to the control end of the waveform adjustment circuit 3, and the waveform adjustment circuit 3 is used to adjust the harmonic signal input to its input end according to the fundamental wave signal input to its control end, and output an auditory alarm signal.

[0035] Specifically, the power supply signal may be a power supply signal provided by a capacitor. When a power failure occurs, the power supply signal supplies power to the first alarm signal output circuit 1 and the second alarm signal output circuit 2 .

[0036] Specifically, the temporal characteristics of the auditory alarm signal are as follows: Figure 2As shown, according to the national standard YY0709-2009, it is required to have at least one set of different auditory alarm signals with high priority, medium priority and low priority, so as to ensure that users can choose a familiar and standard auditory alarm system from all alarm systems. Different pulse group modes, pulse group speeds, pulse widths, repetition rates and relative volumes of low, medium and high priority alarm signals are used to generate different urgency levels that require operator response. The first alarm signal output circuit 1 and the second alarm signal output circuit 2 can be designed according to actual application conditions, so that the waveform adjustment circuit 3 outputs one of the low, medium and high priority alarm signals to meet the YY0709-2009 parallel standard.

[0037] The working process of the above-mentioned alarm control circuit is: when the power supply fails, the first alarm signal output circuit 1 generates a harmonic signal according to the power supply signal, and the second alarm signal output circuit 2 generates a fundamental signal according to the power supply signal. The harmonic signal is adjusted using the fundamental signal, so that the waveform adjustment circuit 3 outputs an auditory alarm signal that complies with the YY0709-2009 parallel standard.

[0038] The alarm control circuit of this embodiment uses the fundamental signal generated by the second alarm signal output circuit 2 to control the harmonic signal generated by the first alarm signal output circuit 1, so that the output end of the waveform adjustment circuit 3 outputs an auditory alarm signal that complies with the YY0709-2009 parallel standard, while reducing the overall circuit power consumption and the requirement for backup power supply, greatly reducing the cost of the product.

[0039] like Figure 3 As shown, a schematic diagram of the module structure of an alarm control circuit is provided.

[0040] In one embodiment, if Figure 3 As shown in the above Figure 1 On the basis of the alarm control circuit shown, the first alarm signal output circuit 1 includes: a first alarm signal generating module 11 and a first alarm signal switching module 12, the input end of the first alarm signal generating module 11 is used to input the power supply signal, the output end of the first alarm signal generating module 11 is connected to the normally open input end of the first alarm signal switching module 12, the normally closed input end of the first alarm signal switching module 12 is used to connect the harmonic signal output end of the processor 4, the output end of the first alarm signal switching module 12 is connected to the input end of the waveform adjustment circuit 3, and the control end of the first alarm signal switching module 12 is used to connect the first power supply.

[0041] Specifically, the first alarm signal generating module 11 is used to generate a harmonic signal according to the power supply signal, and the first alarm signal switching module 12 is used to switch the signal at the output end according to the signal of its control end. When the first power supply is normally powered, the output end of the first alarm signal switching module 12 outputs the harmonic signal generated by the processor 4. When the first power supply loses power, the output end of the first alarm signal switching module 12 outputs the harmonic signal generated by the first alarm signal generating module 11.

[0042] It is understandable that a relay can be set in the first alarm signal switching module 12 for switching, an analog switch can be set in the first alarm signal switching module 12 for switching, an optocoupler can be set in the first alarm signal switching module 12 for switching, and any type of signal switching element can be set in the first alarm signal switching module 12.

[0043] The working process of the above-mentioned alarm control circuit is as follows: when the first power supply is normally supplied, when the system needs to alarm, the output end of the first alarm signal switching module 12 outputs the harmonic signal generated by the processor 4, and the waveform adjustment circuit 3 uses the fundamental signal to adjust the harmonic signal generated by the processor 4; when the first power supply is powered off, the first alarm signal generation module 11 generates a harmonic signal according to the power supply signal, the first alarm signal switching module 12 is switched, and the output end outputs the harmonic signal generated by the first alarm signal generation module 11, and the waveform adjustment circuit 3 uses the fundamental signal to adjust the harmonic signal generated by the first alarm signal generation module 11, and outputs an auditory alarm signal.

[0044] The alarm control circuit of this embodiment is provided with a first alarm signal switching module 12 in the first alarm signal output circuit 1. When the first power supply is normally supplied, the processor 4 is used to generate a harmonic signal. When the first power supply is powered off, the second alarm signal generating module is used to generate a harmonic signal. The combination of software and hardware can meet various alarm requirements.

[0045] In one embodiment, if Figure 3 As shown, on the basis of the above embodiment, the second alarm signal output circuit 2 includes: a second alarm signal generating module 21 and a second alarm signal switching module 22, the input end of the second alarm signal generating module 21 is used to input the power supply signal, the output end of the second alarm signal generating module 21 is connected to the normally open input end of the second alarm signal switching module 22, the normally closed input end of the second alarm signal switching module 22 is used to connect the fundamental signal output end of the processor 4, the output end of the second alarm signal switching module 22 is connected to the control end of the waveform adjustment circuit 3, and the control end of the second alarm signal switching module 22 is used to connect the first power supply.

[0046] Specifically, the second alarm signal generating module 21 is used to generate a harmonic signal according to the power supply signal, and the second alarm signal switching module 22 is used to switch the signal at the output end according to the signal at its control end. When the first power supply is normally powered, the output end of the second alarm signal switching module 22 outputs the fundamental signal generated by the processor 4. When the first power supply fails, the output end of the second alarm signal switching module 22 outputs the harmonic signal generated by the second alarm signal generating module 21.

[0047] It is understandable that the structure of the second alarm signal switching module 22 may be the same as that of the first alarm signal switching module 12, or the structure of the second alarm signal switching module 22 may be different from that of the first alarm signal switching module 12, a relay may be set in the second alarm signal switching module 22 for switching, an analog switch may be set in the second alarm signal switching module 22 for switching, an optocoupler may be set in the second alarm signal switching module 22 for switching, and any type of signal switching element may be set in the second alarm signal switching module 22.

[0048] It is understandable that the first alarm signal generating module 11 and the second alarm signal generating module 21 are hardware circuits. The generated pulse signal can only output one of the low priority alarm signal, the medium priority alarm signal or the high priority alarm signal after being adjusted by the pulse adjustment circuit, and cannot be switched. The signal output by the processor 4 can be adjusted by software to generate any one of the low priority alarm signal, the medium priority alarm signal or the high priority alarm signal, and switch between the three alarm signals to meet various needs.

[0049] The working process of the above-mentioned alarm control circuit is as follows: when the first power supply is normally supplied, when the system needs to alarm, the output end of the first alarm signal switching module 12 outputs the harmonic signal generated by the processor 4, and the output end of the second alarm signal switching module 22 outputs the fundamental signal generated by the processor 4, and the fundamental signal generated by the processor 4 is used to adjust the harmonic signal generated by the processor 4, so that the waveform adjustment circuit 3 outputs an auditory alarm signal; when the first power supply is powered off, the output end of the first alarm signal switching module 12 outputs the harmonic signal generated by the first alarm signal generation module 11, and the output end of the second alarm signal switching module 22 outputs the fundamental signal generated by the second alarm signal generation module 21, and the carrier signal generated by the second alarm signal generation module 21 is adjusted using the fundamental signal generated by the second alarm signal generation module 21, so that the waveform adjustment circuit 3 outputs an auditory alarm signal.

[0050] The alarm control circuit of this embodiment is provided with a second alarm signal switching module 22 in the second alarm signal output circuit 2. When the first power supply is normally supplied, the two pulse signals generated by the processor 4 can form a low priority alarm signal, a medium priority alarm signal or a high priority alarm signal. When the first power supply is powered off, the two pulse signals generated by the first alarm signal generating module 11 and the second alarm signal generating module 21 can be used to form an alarm signal of any level that complies with the YY0709-2009 parallel standard. The combination of software and hardware can realize all alarm requirements of the YY0709-2009 parallel standard for normal power supply and abnormal power off.

[0051] In one embodiment, if Figure 4 As shown, a circuit connection diagram of a waveform adjustment circuit 3 is provided. Figure 1 On the basis of the alarm control circuit shown, the waveform adjustment circuit 3 includes: a first RC filter branch 31, a second RC filter branch 32 and a first switch tube Q1, the input end of the first RC filter branch 31 is connected to the output end of the first alarm signal output circuit 1, the output end of the first RC filter branch 31 is connected to the input end of the second RC filter branch 32, the output end of the second RC filter branch 32 is used to output the auditory alarm signal, the output end of the second RC filter branch 32 is connected to the input end of the first switch tube Q1, the output end of the first switch tube Q1 is grounded, and the control end of the first switch tube Q1 is connected to the output end of the second alarm signal output circuit 2.

[0052] Specifically, the first switch tube Q1 may be any switch tube, the first switch tube Q1 may be a triode, the first switch tube Q1 may also be a MOS tube, the first switch tube Q1 may also be a field effect tube, preferably, Figure 4 As shown, the first switch tube Q1 is a triode, and the first switch tube Q1 is controlled by the fundamental wave signal output by the second alarm signal output circuit 2. Figure 5 As shown, a timing diagram of a harmonic signal and a fundamental signal is provided. Specifically, Figure 5 The upper part is the timing diagram of the harmonic signal. Figure 5 The lower part is the timing diagram of the fundamental signal. Figure 5 The fundamental wave signal shown controls the first switch tube, thereby controlling Figure 5 The output of the harmonic signal shown causes the output end of the waveform adjustment circuit 3 to output a low priority alarm signal that complies with the YY0709-2009 parallel standard.

[0053] Furthermore, a DC blocking circuit in which a capacitor and a resistor are connected in series may be provided in the circuit to filter out the DC component in the waveform.

[0054] The working process of the above-mentioned alarm control circuit is: the fundamental signal output by the second alarm signal output circuit 2 controls the on and off of the first switch tube Q1, so that the harmonic signal output by the first alarm signal output circuit 1 is output to the ground through the switch tube, or flows to the output end, so that the signal output by the output end of the waveform adjustment circuit 3 is an auditory alarm signal that complies with the YY0709-2009 parallel standard.

[0055] In the alarm control circuit of this embodiment, a second-order low-pass filter circuit is arranged in the waveform adjustment circuit 3 to filter the signal output by the first alarm signal output circuit 1, thereby ensuring the quality of the signal. At the same time, a first switch tube Q1 is arranged so that the signal generated by the second alarm signal output circuit 2 controls the signal generated by the first alarm signal output circuit 1 through the first switch tube Q1. The switch tube has an extremely fast response speed and can accurately control the signal, thereby ensuring the accuracy of the signal.

[0056] In one embodiment, if Figure 6 As shown, a circuit connection diagram of a first alarm signal switching module 12 is provided. Figure 3 On the basis of the alarm control circuit shown, the first alarm signal switching module 12 includes: a first voltage divider circuit 121 and a first single-pole double-throw analog switch U3, the input end of the first voltage divider circuit 121 is used to connect the first power supply, the first output end of the first voltage divider circuit 121 is grounded, the second output end of the first voltage divider circuit 121 is connected to the control end of the first single-pole double-throw analog switch U3, the normally open input end of the first single-pole double-throw analog switch U3 is connected to the output end of the first alarm signal generating module 11, the normally closed input end of the first single-pole double-throw analog switch U3 is used to connect the harmonic signal output end of the processor 4, and the output end of the single-pole double-throw analog switch U3 is connected to the input end of the waveform adjustment circuit 3.

[0057] Specifically, the first voltage divider circuit 121 is used to control the signal at the control end of the first SPDT analog switch U3. Preferably, a filter capacitor may be provided between the power supply end and the ground of the first SPDT analog switch U3 to filter the power supply signal VCC.

[0058] The working process of the above-mentioned alarm control circuit is: when the first power supply VCC-5V is powered, the control end of the first single-pole double-throw analog switch U3 is set high, the output end of the first single-pole double-throw analog switch U3 is connected to the normally closed input end, and the signal of the processor 4 flows to the waveform adjustment circuit 3 through the first single-pole double-throw analog switch U3; when the first power supply VCC-5V loses power, the control end of the first single-pole double-throw analog switch U3 is pulled low, the output end of the first single-pole double-throw analog switch U3 is connected to the normally open input end, and the signal of the first alarm signal generating module 11 flows to the waveform adjustment circuit 3 through the first single-pole double-throw analog switch U3.

[0059] In the alarm control circuit of this embodiment, a first single-pole double-throw analog switch U3 is set in the first alarm signal switching module 12 to switch the signal between the processor 4 and the first alarm signal generating module 11, and the signal at the control end of the first single-pole double-throw analog switch U3 is controlled by the first voltage divider circuit 121. The first single-pole double-throw analog switch U3 can quickly switch signals and has a high isolation capability, which can prevent crosstalk between different signals.

[0060] In one embodiment, if Figure 7 As shown, a circuit connection diagram of a second alarm signal switching module 22 is provided. Figure 3 On the basis of the alarm control circuit shown, the second alarm signal switching module 22 includes: a second voltage divider circuit 221 and a second single-pole double-throw analog switch U4, the input end of the second voltage divider circuit 221 is used to connect the first power supply, the first output end of the second voltage divider circuit 221 is grounded, the second output end of the second voltage divider circuit 221 is connected to the control end of the second single-pole double-throw analog switch U4, the normally open input end of the second single-pole double-throw analog switch U4 is connected to the output end of the second alarm signal generating module 21, the normally closed input end of the second single-pole double-throw analog switch U4 is used to connect the fundamental signal output end of the processor 4, and the output end of the second single-pole double-throw analog switch U4 is connected to the control end of the waveform adjustment circuit 3.

[0061] Specifically, the second voltage divider circuit 221 is used to control the signal at the control end of the second SPDT analog switch U4. Preferably, a filter capacitor may be provided between the power supply end and the ground of the second SPDT analog switch U4 to filter the power supply signal VCC.

[0062] The working process of the above-mentioned alarm control circuit is: when the first power supply VCC-5V is powered, the control end of the second single-pole double-throw analog switch U4 is set high, the output end of the second single-pole double-throw analog switch U4 is connected to the normally closed input end, and the signal of the processor 4 flows to the waveform adjustment circuit 3 through the second single-pole double-throw analog switch U4; when the first power supply VCC-5V loses power, the control end of the second single-pole double-throw analog switch U4 is pulled low, the output end of the second single-pole double-throw analog switch U4 is connected to the normally open input end, and the signal of the second alarm signal generating module 21 flows to the waveform adjustment circuit 3 through the second single-pole double-throw analog switch U4.

[0063] In the alarm control circuit of this embodiment, a second single-pole double-throw analog switch U4 is set in the second alarm signal switching module 22 to switch the signal between the processor 4 and the second alarm signal generating module 21, and the signal at the control end of the second single-pole double-throw analog switch U4 is controlled by the second voltage divider circuit 221. The second single-pole double-throw analog switch U4 can quickly switch signals and has a high isolation capability, which can prevent crosstalk between different signals.

[0064] In one embodiment, if Figure 8 As shown, a circuit connection diagram of a first alarm signal generating module 11 is provided. Figure 3 On the basis of the alarm control circuit shown in the figure, the first alarm signal generating module 11 includes: a first voltage dividing branch 111, a first energy storage branch 112, a first positive feedback branch 113, a first negative feedback branch 114 and a first comparator U1A, the input end of the first voltage dividing branch 111 is used for the power supply signal VCC, the first output end of the first voltage dividing branch 111 is connected to the positive input end of the first comparator U1A, the second output end of the first voltage dividing branch 111 is grounded, and one end of the first energy storage branch 112 is connected to the negative input end of the first comparator U1A. The first energy storage branch 112 is grounded, the input end of the first positive feedback branch 113 is connected to the output end of the first comparator U1A, the output end of the first positive feedback branch 113 is connected to the positive input end of the first comparator U1A, the input end of the first negative feedback branch 114 is connected to the output end of the first comparator U1A, the output end of the first negative feedback branch 114 is connected to the inverting input end of the first comparator U1A, and the output end of the first comparator U1A is connected to the normally open input end of the first alarm signal switching module 12.

[0065] The working process of the above-mentioned alarm control circuit is as follows: when the first power supply fails, the capacity of the capacitor C1 in the first energy storage branch 112 cannot change suddenly, the voltage of the inverting input terminal of the first comparator U1A is 0, the voltage of the non-inverting input terminal is greater than the voltage of the inverting input terminal, and the output terminal outputs a high-level signal. The signal at the output terminal charges the capacitor C1 through the resistor R4 of the first negative feedback branch. The signal at the output terminal simultaneously passes through the resistor R3 of the first positive feedback branch 113 to form positive feedback, and divides the signal at the positive input terminal. When the voltage across the capacitor C1 is greater than the voltage at the positive input terminal, the first comparator U1A outputs a low-level signal. When the capacitor C1 is discharged and the voltage at the inverting input terminal is less than the voltage at the positive input terminal, the first comparator U1A outputs a high-level signal. This cycle is repeated to form a pulse signal at the output terminal of the first comparator U1A.

[0066] Specifically, the output frequency of the waveform output by the first alarm signal generating module 11 can be adjusted by adjusting the time constant of the resistor R4 of the first negative feedback branch 114 and the capacitor C1 of the first energy storage branch 112, and the output duty cycle of the waveform can be adjusted by adjusting the parameters of the resistors R1 and R2 in the first voltage divider branch 111 and the resistor R3 in the first positive feedback branch 113. Preferably, the second alarm signal generating module 21 has the same structure as the first alarm signal generating module 11, and the volume of the auditory alarm signal can be adjusted by adjusting the duty cycle of the second alarm signal generating module 21.

[0067] The alarm control circuit of this embodiment sets a first comparator U1A in the first alarm signal generating module 11, and combines the first voltage dividing branch 111, the first energy storage branch 112, the first positive feedback branch 113, and the first negative feedback branch 114 to enable the first alarm signal generating module 11 to generate a pulse signal. It is purely hardware controlled and has a simple circuit structure, which greatly reduces the cost of the circuit.

[0068] In one embodiment, if Fig. 9 As shown, a circuit connection diagram of a power supply control circuit is provided. Figure 3 On the basis of the alarm control circuit shown, the alarm control circuit also includes: a power supply control circuit 5, which includes: a power supply branch 51, an energy storage branch 52, a power supply control branch 53, a voltage stabilizing branch 54 and a power supply selection branch 55, the input end of the power supply branch 51 is used to connect the first power supply VCC-5V, the output end of the power supply branch 51 is connected to the input end of the energy storage branch 52, the output end of the energy storage branch 52 is connected to the input end of the power supply control branch 53, the output end of the power supply control branch 53 is connected to the input end of the voltage stabilizing branch 54, the control end of the power supply control branch 53 is connected to the first power supply VCC-5V through a first protection circuit 531, the control end of the power supply control branch is grounded through a second protection circuit 532, the output end of the voltage stabilizing branch 54 is connected to the first input end of the power supply selection branch 55, the second input end of the power supply selection branch 55 is used to connect the first power supply VCC-5V, and the output end of the power supply selection branch 55 is used to output the power supply signal VCC.

[0069] Specifically, the diode D1 in the power supply branch 51 can prevent the capacitor C4 in the energy storage branch 52 from charging the first power supply VCC-5V when the first power supply VCC-5V is powered off; the capacitor C4 is used to charge when the first power supply VCC-5V is normally powered, and to power the subsequent circuit when the first power supply VCC-5V is powered off; the switch tube Q2 in the power supply control branch 53 is turned on and off according to the signal of the control end to control the power supply of the capacitor C4, the voltage stabilizing branch 54 is used to stabilize the signal output by the capacitor C4, and the power supply selection branch 55 is used to use the signal output by the first power supply VCC-5V to power the subsequent circuit when the first power supply VCC-5V is powered, and to use the stabilized signal to power the subsequent circuit when the first power supply VCC-5V is powered off.

[0070] The working process of the above-mentioned alarm control circuit is as follows: when the first power supply VCC-5V is supplying power normally, the signal output by the first power supply VCC-5V charges the energy storage branch 52 through the power supply branch 52, the power supply control branch 53 is turned off, and the power supply selection branch 55 uses the signal output by the first power supply VCC-5V to power the subsequent circuit; when the first power supply VCC-5V loses power, the power supply control branch 53 is turned on, and the signal output by the energy storage branch 52 is stabilized to power the subsequent circuit.

[0071] The alarm control circuit of this embodiment is provided with an energy storage branch to supply power to subsequent circuits when the first power supply VCC-5V loses power, which can not only meet the requirements of the YY0709-2009 parallel standard on alarm duration, but also reduce the cost of the circuit.

[0072] In one embodiment, if Fig.10 As shown, a circuit connection diagram of an alarm circuit is provided. Figure 3 On the basis of the alarm control circuit shown, the alarm control circuit also includes: an alarm circuit, the alarm circuit 6 includes: a power amplifier module 61 and a speaker 62, the audio signal input end of the power amplifier module 61 is used to input an auditory alarm signal, the audio signal output end of the power amplifier module 61 is used to connect the speaker 62, the enable control pin of the power amplifier module 61 is used to connect the enable control signal output end of the processor 4, and the enable control pin of the power amplifier module 61 inputs the power supply signal VCC through the third protection circuit 63.

[0073] Related devices may be provided in the power amplifier module to protect the power amplifier U5.

[0074] The working process of the above-mentioned alarm control circuit is as follows: when the first power supply VCC-5V is normally powered, the processor 4 controls the power amplifier module by controlling the signal output from the enable control signal output terminal; when the processor 4 outputs a high-level signal, the power amplifier module works normally and controls the speaker according to the signal input from the audio signal input terminal; when the processor 4 outputs a low-level signal, the power amplifier module cannot work and the speaker cannot make a sound; when the first power supply VCC-5V loses power, the enable control pin of the power amplifier module is pulled high by the power supply signal VCC, and the power amplifier module controls the speaker according to the signal input from its audio signal input terminal, and the speaker issues a power-off alarm.

[0075] The alarm control circuit of this embodiment is provided with a power amplifier module in the alarm circuit. The power amplifier module is used to control the speaker, which can reduce signal distortion, ensure the clarity and dynamic range of the audio output, and improve the overall sound quality.

[0076] In one embodiment, a medical device is provided, and the medical device includes the alarm control circuit mentioned in any of the above embodiments.

[0077] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. An alarm control circuit, characterized in that: include: A first alarm signal output circuit, a second alarm signal output circuit and a waveform adjustment circuit, wherein the input end of the first alarm signal output circuit is used to input a power supply signal, the input end of the second alarm signal output circuit is used to input the power supply signal, the output end of the first alarm signal output circuit is connected to the input end of the waveform adjustment circuit, the output end of the second alarm signal output circuit is connected to the control end of the waveform adjustment circuit, and the waveform adjustment circuit is used to adjust the harmonic signal input to its input end according to the fundamental wave signal input to its control end, and output an auditory alarm signal.

2. The alarm control circuit according to claim 1, characterized in that: The first alarm signal output circuit includes: a first alarm signal generating module and a first alarm signal switching module, the input end of the first alarm signal generating module is used to input the power supply signal, the output end of the first alarm signal generating module is connected to the normally open input end of the first alarm signal switching module, the normally closed input end of the first alarm signal switching module is used to connect to the harmonic signal output end of the processor, the output end of the first alarm signal switching module is connected to the input end of the waveform adjustment circuit, and the control end of the first alarm signal switching module is used to connect to the first power supply.

3. The alarm control circuit according to claim 2, characterized in that: The second alarm signal output circuit includes: a second alarm signal generating module and a second alarm signal switching module, the input end of the second alarm signal generating module is used to input the power supply signal, the output end of the second alarm signal generating module is connected to the normally open input end of the second alarm signal switching module, the normally closed input end of the second alarm signal switching module is used to connect to the fundamental signal output end of the processor, the output end of the second alarm signal switching module is connected to the control end of the waveform adjustment circuit, and the control end of the second alarm signal switching module is used to connect to the first power supply.

4. The alarm control circuit according to claim 1, characterized in that: The waveform adjustment circuit includes: a first RC filter branch, a second RC filter branch and a first switch tube, the input end of the first RC filter branch is connected to the output end of the first alarm signal output circuit, the output end of the first RC filter branch is connected to the input end of the second RC filter branch, the output end of the second RC filter branch is used to output the auditory alarm signal, the output end of the second RC filter branch is connected to the input end of the first switch tube, the output end of the first switch tube is grounded, and the control end of the first switch tube is connected to the output end of the second alarm signal output circuit.

5. The alarm control circuit according to claim 3, characterized in that: The first alarm signal switching module includes: a first voltage divider circuit and a first single-pole double-throw analog switch, the input end of the first voltage divider circuit is used to connect the first power supply, the first output end of the first voltage divider circuit is grounded, the second output end of the first voltage divider circuit is connected to the control end of the first single-pole double-throw analog switch, the normally open input end of the first single-pole double-throw analog switch is connected to the output end of the first alarm signal generating module, the normally closed input end of the first single-pole double-throw analog switch is used to connect the harmonic signal output end of the processor, and the output end of the single-pole double-throw analog switch is connected to the input end of the waveform adjustment circuit.

6. The alarm control circuit according to claim 3, characterized in that: The second alarm signal switching module includes: a second voltage divider circuit and a second single-pole double-throw analog switch, the input end of the second voltage divider circuit is used to connect to the first power supply, the first output end of the second voltage divider circuit is grounded, the second output end of the second voltage divider circuit is connected to the control end of the second single-pole double-throw analog switch, the normally open input end of the second single-pole double-throw analog switch is connected to the output end of the second alarm signal generating module, the normally closed input end of the second single-pole double-throw analog switch is used to connect to the fundamental signal output end of the processor, and the output end of the second single-pole double-throw analog switch is connected to the control end of the waveform adjustment circuit.

7. The alarm control circuit according to claim 3, characterized in that: The first alarm signal generating module includes: a first voltage dividing branch, a first energy storage branch, a first positive feedback branch, a first negative feedback branch and a first comparator, the input end of the first voltage dividing branch is used for the power supply signal, the first output end of the first voltage dividing branch is connected to the positive input end of the first comparator, the second output end of the first voltage dividing branch is grounded, one end of the first energy storage branch is connected to the inverting input end of the first comparator, the other end of the first energy storage branch is grounded, the input end of the first positive feedback branch is connected to the output end of the first comparator, the output end of the first positive feedback branch is connected to the positive input end of the first comparator, the input end of the first negative feedback branch is connected to the output end of the first comparator, the output end of the first negative feedback branch is connected to the inverting input end of the first comparator, and the output end of the first comparator is connected to the normally open input end of the first alarm signal switching module.

8. The alarm control circuit according to claim 3, characterized in that: The alarm control circuit also includes: a power supply control circuit, which includes: a power supply branch, an energy storage branch, a power supply control branch, a voltage stabilizing branch and a power supply selection branch, the input end of the power supply branch is used to connect to the first power supply, the output end of the power supply branch is connected to the input end of the energy storage branch, the output end of the energy storage branch is connected to the input end of the power supply control branch, the output end of the power supply control branch is connected to the input end of the voltage stabilizing branch, the control end of the power supply control branch is connected to the first power supply through a first protection circuit, the control end of the power supply control branch is grounded through a second protection circuit, the output end of the voltage stabilizing branch is connected to the first input end of the power supply selection branch, the second input end of the power supply selection branch is used to connect to the first power supply, and the output end of the power supply selection branch is used to output the power supply signal.

9. The alarm control circuit according to claim 3, characterized in that: The alarm control circuit also includes: an alarm circuit, which includes: a power amplifier module and a speaker, the audio signal input end of the power amplifier module is used to input an auditory alarm signal, the audio signal output end of the power amplifier module is used to connect to the speaker, the enable control pin of the power amplifier module is used to connect to the enable control signal output end of the processor, and the enable control pin of the power amplifier module inputs the power supply signal through a third protection circuit.

10. A medical device, characterized in that: Comprising the alarm control circuit according to any one of claims 1-9.

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