Power-down alarm control circuit and medical device

Abstract

The present application relates to the technical field of electronics, and particularly relates to a power-down alarm control circuit and a medical device. In the power-down alarm control circuit of the present application, when a power source of a medical device is powered down or abnormal, a first comparison branch of an RC oscillation circuit generates an in-phase control signal on the basis of a power supply signal and a feedback signal; a second comparison branch generates an out-of-phase control signal on the basis of the feedback signal; a comparator outputs, on the basis of the in-phase control signal and the out-of-phase control signal, an oscillation signal with an adjustable frequency and adjustable duty ratio; and an alarm circuit generates, on the basis of the oscillation signal, intermittent and discontinuous sound alarm signals, so as to prompt a medical staff member. Therefore, while the reliability of a power-down alarm circuit is ensured, the problem of the high power consumption of the power-down alarm circuit in a medical device is solved.

Description

Power-off alarm control circuit and medical equipment Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a power-off alarm control circuit and medical equipment. Background Art

[0002] To ensure patient safety, most medical devices are equipped with power-off alarm circuits. These circuits generate an alarm signal to alert medical personnel when both the external and internal power supplies fail or become abnormal.

[0003] However, most power-failure alarm circuits in the related art are complex in design, require numerous components, and are therefore expensive to manufacture. Furthermore, the large number of components in these circuits can easily lead to various malfunctions, which can cause the circuit's alarm function to fail or result in false alarms. This results in poor reliability and a failure to meet user needs. Furthermore, the buzzer continues to sound during a power outage, resulting in rapid power consumption. Therefore, improvements are needed in the power-failure alarm circuits of the related art.

[0004] Summary of the Invention

[0005] Embodiments of the present application provide a power-off alarm control circuit and a medical device to solve the problems of poor reliability and high power consumption of the power-off alarm circuit in the medical device.

[0006] In a first aspect, the present application provides a power-off alarm control circuit, comprising an RC oscillator circuit (1), an alarm circuit (2);

[0007] The RC oscillator circuit (1) comprises a first comparison branch (11), a second comparison branch (12), and a comparator (13); the first input end of the first comparison branch (11) is used to input a power supply signal; the second input end of the first comparison branch (11) is connected to the output end of the comparator (13); and the output end of the first comparison branch (11) is connected to the non-inverting input end of the comparator (13); the first comparison branch (11) is used to input a non-inverting control signal to the non-inverting input end of the comparator (13) when receiving the power supply signal, and adjust the non-inverting control signal according to the oscillation signal at the second input end;

[0008] The input end of the second comparison branch (12) is connected to the output end of the comparator (13), the output end of the second comparison branch (12) is connected to the inverting input end of the comparator (13), and the output end of the comparator (13) is connected to the alarm circuit (2); the second comparison branch (12) is used to input an inverting control signal to the inverting input end of the comparator (13) after receiving the feedback signal;

[0009] The comparator (13) outputs the oscillation signal at an output end according to the in-phase control signal and the inverted phase control signal, so that the alarm circuit (2) generates a sound alarm signal according to the oscillation signal.

[0010] In one embodiment, the first comparison branch (11) comprises: a first resistor, a second resistor, and a third resistor, one end of the first resistor is used to input the power supply signal, the other end of the first resistor is connected to one end of the second resistor, one end of the second resistor is connected to one end of the third resistor, the other end of the second resistor is grounded, one end of the third resistor is connected to the non-inverting input end of the comparator (13), and the other end of the third resistor is connected to the output end of the comparator (13).

[0011] In one embodiment, the second comparison branch (12) comprises a fourth resistor and a first charging capacitor, one end of the fourth resistor is connected to the output end of the comparator (13), the other end of the fourth resistor is connected to the inverting input end of the comparator (13), one end of the first charging capacitor is connected to the inverting input end of the comparator (13), and the other end of the first charging capacitor is grounded.

[0012] In one embodiment, the power-off alarm control circuit further includes:

[0013] A power supply control circuit (3), wherein a control end of the power supply control circuit (3) is used to receive a power-off signal, an input end of the power supply control circuit (3) is used to input a first power supply signal, an output end of the power supply control circuit (3) is connected to an input end of the RC oscillator circuit (1), and the power supply control circuit (3) is used to control the power supply signal input into the RC oscillator circuit (1) according to the power-off signal.

[0014] In one embodiment, the power-off alarm control circuit further includes:

[0015] A power supply circuit (4), comprising a first power supply, an input end of the power supply circuit (4) connected to a second power supply, an output end of the power supply circuit (4) connected to an input end of the power supply control circuit (3), and the power supply circuit (4) used to charge when the power supply load is operating normally and output a first power supply signal after the power supply load is powered off.

[0016] In one embodiment, the power-off alarm control circuit further includes:

[0017] A voltage stabilizing circuit (5), wherein the input end of the voltage stabilizing circuit (5) is connected to the output end of the power supply control circuit (3), the output end of the voltage stabilizing circuit (5) is connected to the input end of the RC oscillation circuit (1), and the voltage stabilizing circuit (5) is used to stabilize the signal output by the power supply control circuit (3).

[0018] In one embodiment, the power supply control circuit (3) includes a first switch tube and a fifth resistor, wherein the control end of the first switch tube is connected to one end of the fifth resistor, the input end of the first switch tube is used to input a first power supply signal, the output end of the first switch tube is connected to the input end of the RC oscillation circuit (1), and the other end of the fifth resistor is used to input a power-off signal.

[0019] In one embodiment, the power supply circuit (4) includes a second charging capacitor, a first diode, and a sixth resistor, wherein the positive electrode of the second charging capacitor is connected to the input end of the power supply control circuit (3), the negative electrode of the second charging capacitor is grounded, the positive electrode of the first diode is connected to a second power supply, the negative electrode of the first diode is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the positive electrode of the second charging capacitor.

[0020] In one embodiment, the voltage stabilizing circuit (5) includes a voltage stabilizer, a first capacitor, and a second capacitor, wherein the input end of the voltage stabilizer is connected to one end of the first capacitor, the output end of the voltage stabilizer is connected to one end of the second capacitor, the common end of the voltage stabilizer is grounded, one end of the first capacitor is connected to the output end of the power supply control circuit (3), the other end of the first capacitor is grounded, one end of the second capacitor is connected to the input end of the RC oscillation circuit (1), and the other end of the second capacitor is grounded.

[0021] In a second aspect, the present application provides a medical device, which includes the power-off alarm control circuit as described in the first aspect and its improvement.

[0022] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0023] The power-off alarm control circuit of the present application, when the power supply of the medical equipment fails or is abnormal, the first comparison branch of the RC oscillation circuit generates a common-phase control signal based on the power supply signal and the feedback signal, and the second comparison branch generates an anti-phase control signal based on the feedback signal. The comparator outputs an oscillation signal with adjustable frequency and duty cycle based on the common-phase control signal and the anti-phase control signal. The alarm circuit generates an intermittent, non-continuous sound alarm signal based on the oscillation signal to alert medical staff, while ensuring the reliability of the power-off alarm circuit and lowering power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] FIG1 is a schematic diagram of the module structure of a power-off alarm control circuit provided in one embodiment of the present application;

[0026] FIG2 is a circuit connection diagram of a first comparison branch provided in an embodiment of the present application;

[0027] FIG3 is a circuit connection diagram of a second comparison branch provided in an embodiment of the present application;

[0028] FIG4 is a schematic diagram of the module structure of a power-off alarm control circuit provided in an embodiment of the present application;

[0029] FIG5 is a schematic diagram of the module structure of a power-off alarm control circuit provided in an embodiment of the present application;

[0030] FIG6 is a schematic diagram of the module structure of a power-off alarm control circuit provided in an embodiment of the present application;

[0031] FIG7 is a circuit connection diagram of a power supply control circuit provided in an embodiment of the present application;

[0032] FIG8 is a circuit connection diagram of a power supply circuit provided in an embodiment of the present application;

[0033] FIG9 is a circuit connection diagram of a voltage stabilizing circuit provided in an embodiment of the present application;

[0034] FIG10 is a circuit connection diagram of a power-off alarm control circuit provided in an embodiment of the present application;

[0035] Among them, 1. RC oscillation circuit, 2. alarm circuit, 3. power supply control circuit, 4. power supply circuit, 5. voltage stabilizing circuit, 11. first comparison branch, 12. second comparison branch, 13. comparator. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0037] In the description of this application, 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting this application. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0039] In order to fully understand the present application, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present application. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may also have other implementation methods.

[0040] 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 art, and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0041] In one embodiment, as shown in FIG1 , a schematic diagram of a module structure of a power-off alarm control circuit is provided, including an RC oscillator circuit 1 and an alarm circuit 2;

[0042] The RC oscillator circuit 1 includes a first comparison branch 11, a second comparison branch 12, and a comparator 13. The first input terminal of the first comparison branch 11 is used to input a power supply signal, the second input terminal of the first comparison branch 11 is connected to the output terminal of the comparator 13, and the output terminal of the first comparison branch 11 is connected to the non-inverting input terminal of the comparator 13. The first comparison branch 11 is used to input a non-inverting control signal to the non-inverting input terminal of the comparator 13 when receiving the power supply signal, and adjust the non-inverting control signal according to the oscillation signal at the second input terminal.

[0043] The input end of the second comparison branch 12 is connected to the output end of the comparator 13, the output end of the second comparison branch 12 is connected to the inverting input end of the comparator 13, and the output end of the comparator 13 is connected to the alarm circuit 2; the second comparison branch 12 is used to input an inverting control signal to the inverting input end of the comparator 13 after receiving the oscillation signal; the comparator 13 outputs an oscillation signal at the output end according to the in-phase control signal and the inverting control signal, so that the alarm circuit 2 generates a sound alarm signal according to the oscillation signal.

[0044] The working process of the above-mentioned power-off alarm control circuit is as follows: when the power supply load is working normally, the RC oscillator circuit 1 has no input, and the RC oscillator circuit 1 and the alarm circuit 2 do not work. When the power supply load is powered off or abnormal, the power supply signal flows to the first comparison branch 11 to power the first comparison branch 11. The first comparison branch 11 provides a non-inverting control signal to the non-inverting input terminal of the comparator 13. At this time, the inverting input terminal of the comparator 13 is not turned on, the voltage at the non-inverting input terminal of the comparator 13 is greater than the voltage at the inverting input terminal, the output terminal of the comparator 13 outputs a high-level signal, and the alarm circuit 2 generates a sound alarm signal.

[0045] The first comparison branch 11 adjusts the in-phase control signal after receiving a high-level signal, and the second comparison branch adjusts the reverse control signal after receiving a high-level signal. When the reverse control signal is greater than the in-phase control signal, that is, the voltage at the reverse input terminal is greater than the voltage at the non-in-phase input terminal, the output terminal of the comparator 13 outputs a low-level signal, the alarm circuit 2 is turned off, and no sound alarm signal is generated.

[0046] The first comparison branch 11 adjusts the in-phase control signal after receiving a low-level signal, and the second comparison branch 12 adjusts the reverse control signal after receiving a high-level signal. When the reverse control signal is less than the in-phase control signal, that is, the voltage at the reverse input terminal is less than the voltage at the non-in-phase input terminal, the output terminal of the comparator 13 outputs a high-level signal, and the alarm circuit 2 generates a sound alarm signal. This cycle is repeated continuously, so that the output terminal of the comparator 13 outputs an alternating oscillation signal, and the alarm circuit 2 generates an intermittent, discontinuous sound alarm signal according to the oscillation signal.

[0047] It is understood that adjusting the in-phase control signal and adjusting the inverting control signal in this embodiment can increase or decrease the signal. In this embodiment, the power supply load is described using medical equipment as an example. It is understood that the power supply load of this application can be any power supply load, for example, industrial equipment, transportation equipment, etc.

[0048] In the power-off alarm control circuit of this embodiment, when the power supply of the medical device fails or is abnormal, the first comparison branch 11 of the RC oscillator circuit 1 generates a common-phase control signal based on the power supply signal and the feedback signal, and the second comparison branch 12 generates an anti-phase control signal based on the feedback signal. The comparator 13 outputs an oscillation signal with adjustable frequency and duty cycle based on the common-phase control signal and the anti-phase control signal. The alarm circuit 2 generates an intermittent, non-continuous sound alarm signal based on the oscillation signal to alert medical personnel. While ensuring the reliability of the power-off alarm circuit, the problem of high power consumption of the power-off alarm circuit in the medical device is solved.

[0049] In one embodiment, as shown in Figure 2, a circuit connection diagram of a first comparison branch is provided. On the basis of the power-off alarm control circuit shown in Figure 1 above, the first comparison branch 11 includes: a first resistor R1, a second resistor R2, and a third resistor R3. One end of the first resistor R1 is used to input a power supply signal, the other end of the first resistor R1 is connected to one end of the second resistor R2, one end of the second resistor R2 is connected to one end of the third resistor R3, the other end of the second resistor R2 is grounded, one end of the third resistor R3 is connected to the non-inverting input end of the comparator 13, and the other end of the third resistor R3 is connected to the output end of the comparator 13.

[0050] The working process of the above-mentioned power-off alarm control circuit is as follows: when the power supply to the power supply load fails or is abnormal, the power supply signal flows to the first comparison branch 11, and the first resistor R1 and the second resistor R2 divide the power supply signal and provide it to the non-inverting input terminal of the comparator 13. At this time, the inverting input terminal of the comparator 13 is not turned on, and the voltage at the non-inverting input terminal of the comparator 13 is greater than the voltage at the inverting input terminal. The output terminal of the comparator 13 outputs a high-level signal, which is fed back to the non-inverting input terminal of the comparator 13 through the third resistor R3, and the voltage at the non-inverting input terminal of the comparator 13 increases. When the reverse control signal is greater than the non-inverting control signal, that is, the voltage at the reverse input terminal is greater than the voltage at the non-inverting input terminal, the output terminal of the comparator 13 outputs a low-level signal, which is fed back to the non-inverting input terminal of the comparator 13 through the third resistor R3, and the voltage at the non-inverting input terminal of the comparator 13 decreases, and this cycle is repeated continuously.

[0051] The power-off alarm control circuit of this embodiment divides the power supply signal by setting a first resistor R1 and a second resistor R2, and provides the divided signal to the comparator 13 to protect the comparator 13 and ensure that the comparator 13 operates at a normal voltage. By setting a third resistor R3, the oscillation signal forms positive feedback on the non-inverting input terminal of the comparator 13. When the comparator 13 outputs a high-level signal, the non-inverting control signal increases, and when the comparator 13 outputs a low-level signal, the non-inverting control signal decreases. By continuously changing the non-inverting control signal, the comparator 13 combines with the anti-phase control signal to generate an oscillation signal. By adjusting the parameters of the first resistor R1, the second resistor R2, and the third resistor R3, the output duty cycle of the oscillation signal can be adjusted.

[0052] In one embodiment, as shown in FIG3 , a circuit connection diagram of a second comparison branch is provided. Based on the first comparison branch shown in FIG2 , the second comparison branch 12 includes a fourth resistor R4 and a first charging capacitor C1. One end of the fourth resistor R4 is connected to the output end of the comparator 13, and the other end of the fourth resistor R4 is connected to the inverting input end of the comparator 13. One end of the first charging capacitor C1 is connected to the inverting input end of the comparator 13, and the other end of the first charging capacitor C1 is grounded.

[0053] The working process of the above-mentioned power-off alarm control circuit is as follows: when the comparator 13 outputs a high-level signal, the high-level signal is fed back to the inverting input terminal of the comparator 13 through the fourth resistor R4, and charges the first charging capacitor C1 connected to the inverting input terminal of the comparator 13. When the voltage across the first charging capacitor C1 exceeds the adjusted voltage of the non-inverting input terminal, the output terminal of the comparator 13 outputs a low-level signal. At this time, the low-level signal is lower than the voltage across the first charging capacitor C1. The low-level signal discharges the first charging capacitor C1 through the fourth resistor R4. When the voltage across the first charging capacitor C1 is lower than the adjusted voltage of the non-inverting input terminal, the output terminal of the comparator 13 outputs a high-level signal, and this cycle is repeated continuously.

[0054] The power-off alarm control circuit of this embodiment changes the inverting control signal by setting a first charging capacitor C1 at the inverting input terminal of the comparator 13 for charging and discharging, so that the comparator 13 generates an oscillation signal in combination with the inverting control signal. The output frequency of the oscillation signal can be adjusted by adjusting the parameters of the fourth resistor R4 and the first charging capacitor C1.

[0055] In one embodiment, as shown in FIG4 , a schematic diagram of a module structure of a power failure alarm control circuit is provided. Based on the power failure alarm control circuit shown in FIG1 , the power failure alarm control circuit further includes:

[0056] The power supply control circuit 3 includes a control end for receiving a power-off signal, an input end for inputting a first power supply signal, an output end for the power supply control circuit 3 connected to an input end of the RC oscillation circuit 1, and a power supply control circuit 3 for controlling the power supply signal input into the RC oscillation circuit 1 according to the power-off signal.

[0057] The working process of the above-mentioned power-off alarm control circuit is: when the power supply to the power supply load is off or abnormal, the control end of the power supply control circuit 3 receives a power-off signal, and the power supply control circuit 3 provides a power supply signal to the RC oscillation circuit 1. When the control end of the power supply control circuit 3 does not receive the power-off signal, the power supply control circuit 3 is in the off state.

[0058] The power-off alarm control circuit of this embodiment controls the power supply signal by setting up a power supply control circuit 3. When the power supply load is working normally, the subsequent circuit is shut down to reduce power consumption and no alarm signal is generated. When the power supply load power fails or is abnormal, the control end of the power supply control circuit 3 receives a power-off signal, turns on the subsequent circuit, and the alarm circuit 2 generates an alarm signal.

[0059] In one embodiment, as shown in FIG5 , a schematic diagram of a module structure of a power failure alarm control circuit is provided. Based on the power failure alarm control circuit shown in FIG4 , the power failure alarm control circuit further includes:

[0060] The power supply circuit 4 includes a first power supply, an input end of the power supply circuit 4 is connected to a second power supply, an output end of the power supply circuit 4 is connected to an input end of the power supply control circuit 3, and the power supply circuit 4 is used to charge when the power supply load is working normally, and output a first power supply signal after the power supply load is powered off.

[0061] The working process of the above power-off alarm control circuit is: by setting the power supply circuit 4, the second power supply is used for charging when the power supply load is working normally. When the power supply load is powered off or abnormal, the power supply circuit 4 outputs the first power supply signal to the power supply control circuit 3.

[0062] The power-off alarm control circuit of this embodiment provides a power supply circuit 4 to continuously supply power to the subsequent circuit when the power supply to the load fails or is abnormal, thereby solving the problem that the alarm circuit 2 cannot be continuously supplied with power after the system loses power.

[0063] In one embodiment, as shown in FIG6 , a schematic diagram of a module structure of a power failure alarm control circuit is provided. Based on the power failure alarm control circuit shown in FIG5 , the power failure alarm control circuit further includes:

[0064] The voltage stabilizing circuit 5 has an input end connected to the output end of the power supply control circuit 3 , and an output end of the voltage stabilizing circuit 5 is connected to the input end of the RC oscillation circuit 1 . The voltage stabilizing circuit 5 is used to stabilize the signal output by the power supply control circuit 3 .

[0065] The working process of the above power failure alarm control circuit is as follows: the voltage stabilizing circuit 5 receives the signal output by the power supply control circuit 3 , stabilizes the voltage thereof, generates a power supply signal, and provides the power supply signal to the RC oscillation circuit 1 .

[0066] The power-off alarm control circuit of this embodiment stabilizes the signal output by the power supply control circuit 3 by setting a voltage stabilizing circuit 5, and provides the stabilized signal to the RC oscillator circuit 1 as a power supply signal, which can well protect the RC oscillator circuit 1 and keep the RC oscillator circuit 1 running stably.

[0067] In one embodiment, as shown in FIG7 , a circuit connection diagram of a power supply control circuit is provided. Based on the power-off alarm control circuit shown in FIG4 , the power supply control circuit 3 includes a first switch tube Q2 and a fifth resistor R7. The control end of the first switch tube Q2 is connected to one end of the fifth resistor R7. The input end of the first switch tube Q2 is used to input a first power supply signal. The output end of the first switch tube Q2 is connected to the input end of the RC oscillator circuit 1. The other end of the fifth resistor R7 is used to input a power-off signal.

[0068] The working process of the above power-off alarm control circuit is as follows: VIN is the main power input signal. When the power supply load is working normally, VIN is at a high level and the first switch tube Q2 is turned off. When the power supply load power is off or abnormal, VIN is at a low level and the first switch tube Q2 is turned on. The first power signal flows to the subsequent circuit through the first switch tube Q2 to continuously power the subsequent circuit.

[0069] In this embodiment, the first switch tube Q2 is described by taking a MOS tube as an example. It is understandable that the switch tube in this application can be any type of switch tube, for example, a triode, a transistor, a field effect tube, etc.

[0070] In the power-off alarm control circuit of this embodiment, the fifth resistor R7 can limit the voltage at the control terminal of the first switch tube Q2, has an anti-interference effect, and protects the first switch tube Q2. By controlling the conduction and shutdown of the circuit by the first switch tube Q2, the reliability of the circuit can be improved.

[0071] In one embodiment, as shown in Figure 8, a circuit connection diagram of a power supply circuit is provided. On the basis of the power-off alarm control circuit shown in Figure 5 above, the power supply circuit 4 includes a second charging capacitor C4, a first diode D1, and a sixth resistor R6. The positive electrode of the second charging capacitor C4 is connected to the input end of the power supply control circuit 3, the negative electrode of the second charging capacitor C4 is grounded, the positive electrode of the first diode D1 is connected to the second power supply, the negative electrode of the first diode D1 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the positive electrode of the second charging capacitor C4.

[0072] The working process of the above power-off alarm control circuit is as follows: when the power supply load is working normally, the first power supply charges the second charging capacitor C4 through the first diode D1 and the sixth resistor R6. When the power supply load power is off or abnormal, it is discharged through the second charging capacitor C4 to provide voltage for the subsequent circuit.

[0073] In the power-off alarm control circuit of this embodiment, the first diode D1 can prevent the second charging capacitor C4 from reversely supplying power to the first power supply when the power supply to the power supply load fails. The sixth resistor R6 is a current-limiting resistor to prevent excessive current from burning out the components of the subsequent circuit, thereby protecting the subsequent circuit. The second charging capacitor C4 is used to charge and discharge the power supply circuit 4. The capacitor has a fast charging speed, large capacity, and long service life, which can ensure the reliability of the circuit.

[0074] In one embodiment, as shown in FIG9 , a circuit connection diagram of a voltage stabilizing circuit is provided. Based on the power-off alarm control circuit shown in FIG6 , the voltage stabilizing circuit 5 includes a voltage stabilizer U2, a first capacitor C8, and a second capacitor C6. The input end of the voltage stabilizer is connected to one end of the first capacitor C8, the output end of the voltage stabilizer U2 is connected to one end of the second capacitor C6, the common end of the voltage stabilizer U2 is grounded, one end of the first capacitor C8 is connected to the output end of the power supply control circuit 3, the other end of the first capacitor C8 is grounded, one end of the second capacitor C6 is connected to the input end of the RC oscillation circuit 1, and the other end of the second capacitor C6 is grounded.

[0075] The working process of the above power-off alarm control circuit is as follows: the signal output by the power supply control circuit 3 is first filtered by the first capacitor C8, then stabilized by the voltage stabilizer U2, and the stabilized signal is filtered by the second capacitor C6 to form a power supply signal provided to the RC oscillation circuit 1.

[0076] In the power-off alarm control circuit of this embodiment, the first capacitor C8 and the second capacitor C6 can filter the voltage and smooth the voltage. At the same time, the first capacitor C8 and the second capacitor C6 are also used to store voltage. When the voltage changes instantaneously, they can quickly release electrical energy to maintain the stability of the circuit. The voltage regulator U2 has a simple structure, a large voltage regulation range, and strong anti-interference ability, which can ensure the reliability of the circuit.

[0077] In one embodiment, as shown in FIG10 , a circuit connection diagram of a power-off alarm control circuit is provided. Based on the power-off alarm control circuit shown in FIG6 , the alarm circuit 2 includes a buzzer Bz1, a second switch tube Q1, a seventh resistor R5, an eighth resistor R10, and a ninth resistor R9. The input end of the buzzer Bz1 is connected to the output end of the second switch tube Q1, the output end of the buzzer Bz1 is grounded, the input end of the second switch tube Q1 is connected to one end of the seventh resistor R5, the control end of the second switch tube Q1 is connected to one end of the eighth resistor R10, the other end of the seventh resistor R5 is used to input a power supply signal, the other end of the eighth resistor R10 is connected to one end of the ninth resistor R9, one end of the ninth resistor R9 is connected to the output end of the comparator 3, and the other end of the ninth resistor R9 is used to input a power supply signal.

[0078] The working process of the above-mentioned power-off alarm control circuit is as follows: the oscillation signal output by the comparator 13 flows to the second switch tube Q1 through the eighth resistor R10. When the oscillation signal is a low-level signal, the second switch tube Q1 is turned off, the buzzer Bz1 is turned off, and no sound alarm signal is generated; when the oscillation signal is a high-level signal, the second switch tube Q1 is turned on, the buzzer Bz1 is turned on, and a sound alarm signal is generated. This cycle is repeated to control the buzzer Bz1 to output intermittent, discontinuous sound alarm signals.

[0079] It is understandable that the buzzer Bz1 of the present application is a passive buzzer, which is driven by an external signal.

[0080] The power-off alarm control circuit of this embodiment ensures circuit reliability by providing a second switching transistor Q1. This ensures that the buzzer Bz1 has a long service life and high reliability, and does not generate radio frequency noise that could interfere with other circuits. The seventh resistor R5 serves as a bias resistor for the second switching transistor Q1, ensuring stable operation. The eighth resistor R10 is a current-limiting resistor, preventing excessive current from damaging the second switching transistor Q1. The ninth resistor R9 is a pull-up resistor, ensuring full conduction of the second switching transistor Q1.

[0081] In one embodiment, a medical device is provided, comprising the power control circuit described in any of the above embodiments. The medical device can generate an intermittent, non-continuous audible alarm signal to alert medical personnel when a power failure occurs, thereby ensuring the reliability of the medical device and resolving the issue of high power consumption in the power failure alarm circuit of the medical device.

[0082] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A power-off alarm control circuit, comprising: RC oscillator circuit, alarm circuit; The RC oscillator circuit includes a first comparison branch, a second comparison branch, and a comparator, wherein the first input end of the first comparison branch is used to input a power supply signal, the second input end of the first comparison branch is connected to the output end of the comparator, and the output end of the first comparison branch is connected to the non-inverting input end of the comparator; the first comparison branch is used to input a non-inverting control signal to the non-inverting input end of the comparator when receiving the power supply signal, and adjust the non-inverting control signal according to the oscillation signal at the second input end; The input end of the second comparison branch is connected to the output end of the comparator, the output end of the second comparison branch is connected to the inverting input end of the comparator, and the output end of the comparator is connected to the alarm circuit; the second comparison branch is used to input an inverting control signal to the inverting input end of the comparator after receiving the oscillation signal; The comparator outputs the oscillation signal at an output terminal according to the in-phase control signal and the inverted control signal, so that the alarm circuit generates a sound alarm signal according to the oscillation signal.

2. The power failure alarm control circuit according to claim 1, characterized in that: The first comparison branch includes: a first resistor, a second resistor, and a third resistor, one end of the first resistor is used to input the power supply signal, the other end of the first resistor is connected to one end of the second resistor, one end of the second resistor is connected to one end of the third resistor, the other end of the second resistor is grounded, one end of the third resistor is connected to the non-inverting input end of the comparator, and the other end of the third resistor is connected to the output end of the comparator.

3. The power failure alarm control circuit according to claim 1, characterized in that: The second comparison branch includes a fourth resistor and a first charging capacitor, one end of the fourth resistor is connected to the output end of the comparator, the other end of the fourth resistor is connected to the inverting input end of the comparator, one end of the first charging capacitor is connected to the inverting input end of the comparator, and the first charging capacitor is connected to the output end of the comparator. The other end of the capacitor is grounded.

4. The power failure alarm control circuit according to claim 1, characterized in that: The power-off alarm control circuit also includes: A power supply control circuit, wherein the control end of the power supply control circuit is used to receive a power-off signal, the input end of the power supply control circuit is used to input a first power supply signal, the output end of the power supply control circuit is connected to the input end of the RC oscillation circuit, and the power supply control circuit is used to control the power supply signal input into the RC oscillation circuit according to the power-off signal.

5. The power failure alarm control circuit according to claim 4, characterized in that: The power-off alarm control circuit also includes: A power supply circuit, wherein the power supply circuit comprises a first power supply, an input end of the power supply circuit is connected to a second power supply, an output end of the power supply circuit is connected to an input end of the power supply control circuit, and the power supply circuit is used to charge when the power supply load is working normally, and output a first power supply signal after the power supply load is powered off.

6. The power failure alarm control circuit according to claim 5, characterized in that: The power-off alarm control circuit also includes: A voltage stabilizing circuit, wherein the input end of the voltage stabilizing circuit is connected to the output end of the power supply control circuit, the output end of the voltage stabilizing circuit is connected to the input end of the RC oscillation circuit, and the voltage stabilizing circuit is used to stabilize the signal output by the power supply control circuit.

7. The power failure alarm control circuit according to claim 4, characterized in that: The power supply control circuit includes a first switch tube and a fifth resistor, the control end of the first switch tube is connected to one end of the fifth resistor, the input end of the first switch tube is used to input a first power supply signal, the output end of the first switch tube is connected to the input end of the RC oscillation circuit, and the other end of the fifth resistor is used to input a power-off signal.

8. The power failure alarm control circuit according to claim 5, characterized in that: The power supply circuit includes a second charging capacitor, a first diode, and a sixth resistor. The positive electrode of the second charging capacitor is connected to the input end of the power supply control circuit, the negative electrode of the second charging capacitor is grounded, the positive electrode of the first diode is connected to the second power supply, the negative electrode of the first diode is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the positive electrode of the second charging capacitor.

9. The power failure alarm control circuit according to claim 6, characterized in that: The voltage stabilization circuit includes a voltage stabilizer, a first capacitor, and a second capacitor. The input end of the voltage stabilizer is connected to one end of the first capacitor, the output end of the voltage stabilizer is connected to one end of the second capacitor, the common end of the voltage stabilizer is grounded, one end of the first capacitor is connected to the output end of the power supply control circuit, the other end of the first capacitor is grounded, one end of the second capacitor is connected to the input end of the RC oscillation circuit, and the other end of the second capacitor is grounded.

10. A medical device, characterized in that: It comprises a power-off alarm control circuit according to any one of claims 1-9.

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