Power-down alarm and power-down time storage circuit suitable for active medical instrument

Abstract

The utility model discloses a power-down alarm and power-down time storage circuit suitable for an active medical instrument. The power-down alarm and power-down time storage circuit comprises a power-down alarm circuit and a power-down time storage circuit. The power failure alarm circuit and the power failure time storage circuit are connected with the standby battery E through a series circuit consisting of a power failure detection switch SW2 and a normally closed contact jd of a relay JD; the relay JD is connected with a system power supply through a system power supply switch SW1; and the power failure detection switch SW2 and the system power supply switch SW1 form a linked switch structure. When the power supply of the active medical instrument is suddenly interrupted (i.e., power failure), an alarm mechanism is automatically triggered, a flickering light alarm and an intermittent sound alarm are output, the flickering frequency of the light alarm and the intermittent sound alarm can be controlled by adjusting the frequency of the oscillator, an equipment operator is reminded to deal with the power failure condition of the equipment, and the power failure time is stored. And the fault power failure time is stored during power failure, and the normal operation power failure is not stored, so that the normal operation power failure and the fault power failure can be distinguished.

Description

Technical Field

[0001] The utility model relates to a power-off alarm circuit for medical equipment, in particular to a power-off alarm and power-off time storage circuit suitable for active medical equipment. Background Art

[0002] Medical devices have high safety and effectiveness requirements. If the power supply system or grid suddenly loses power, active medical devices, without backup batteries or a backup power source, may not function properly and become inoperable. If not addressed promptly, this could pose a life-threatening risk to the patient. Many medical device standards clearly stipulate that audible alarms and visual indicators must be provided to warn of power outages.

[0003] Currently, most power-off processing circuits used in active medical devices have optical or audible alarm outputs. Some circuits have audible and optical alarm outputs but no power-off time storage. Therefore, it is impossible to distinguish between normal operation power-off and fault power-off (system power outage). This not only easily generates false alarms and affects the normal operation of active medical devices, but also the specific time and duration of the power-off (system power outage) are not stored, and the power-off query cannot be performed, which brings difficulties to the later analysis and remediation of the patient's condition during the power-off period. Summary of the Invention

[0004] In view of this, the utility model provides a power-off alarm and power-off time storage circuit suitable for active medical equipment.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The power-off alarm and power-off time storage circuit suitable for active medical devices in the present utility model includes a power-off alarm circuit and a power-off time storage circuit; the power-off alarm circuit and the power-off time storage circuit are connected to the backup battery E through a series circuit composed of a power-off detection switch SW2 and a normally closed contact jd of a relay JD; the relay JD is connected to the system power supply through the system power supply switch SW1; the power-off detection switch SW2 and the system power supply switch SW1 form a linkage switch structure.

[0007] Optionally, the power-off alarm circuit includes an oscillator U1, a transistor Q1, a buzzer YH and a light-emitting diode D1; the power input end of the oscillator U1 and the emitter of the transistor Q1 are connected to the backup battery E through the power-off detection switch SW2 and the normally closed contact jd of the relay JD, the base of the transistor Q1 is connected to the output end of the oscillator U1, and the collector of the transistor Q1 is connected to a parallel circuit consisting of the buzzer YH and the light-emitting diode D1.

[0008] Optionally, the power-down time storage circuit includes an optocoupler U2, a single-chip microcomputer U3, and a large-capacity capacitor C2; a first input terminal of the optocoupler U2 is connected to the backup battery E through the power-down detection switch SW2 and the normally closed contact jd of the relay JD, and a second input terminal of the optocoupler U2 is connected to the ground terminal GND; a first output terminal of the optocoupler U2 is connected to the detection I / O port of the single-chip microcomputer U3, and a power input terminal of the single-chip microcomputer U3 is connected to a second output terminal of the optocoupler U2 through the large-capacity capacitor C2.

[0009] When the power supply of the active medical device is suddenly interrupted (i.e., power-down), the present utility model automatically triggers an alarm mechanism, outputs a flashing light alarm and an intermittent sound alarm. The flashing frequency of the light alarm and the intermittent time of the sound can be controlled by adjusting the frequency of the oscillator, reminding the device operator to handle the power-down situation of the device, and storing the power-down time for later query. The fault power-down time is stored during power-down, and the normal operation power-off is not stored, so as to distinguish between normal operation power-off and fault power-down. Brief Description of the Drawings

[0010] Figure 1 is a circuit principle block diagram of the present utility model.

[0011] Figure 2 is a circuit schematic diagram of the present utility model. Detailed Embodiment

[0012] The following describes the embodiments of the present utility model in detail with reference to the drawings. The embodiments are implemented on the premise of the technical solution of the present utility model, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present utility model is not limited to the following embodiments.

[0013] It should be noted that in the description of the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0014] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected" and "connection" that may appear should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0015] Such as Figure 1As shown, the power-off alarm and power-off time storage circuit suitable for active medical devices of the present utility model includes a power-off alarm circuit and a power-off time storage circuit; the power-off alarm circuit and the power-off time storage circuit are connected to the backup battery E through a series circuit composed of a power-off detection switch SW2 and a normally closed contact jd of a relay JD; the relay JD is connected to the system power supply through a system power supply switch SW1; the power-off detection switch SW2 and the system power supply switch SW1 form a linkage switch structure.

[0016] Beneficially or exemplarily, as Figure 2 As shown, the power-off alarm circuit includes an oscillator U1, a triode Q1, a buzzer YH, and a light-emitting diode D1; the power input terminal of the oscillator U1 and the emitter e of the triode Q1 are connected to the backup battery E through the power-off detection switch SW2 and the normally closed contact jd of the relay JD, the base b of the triode Q1 is connected to the output terminal of the oscillator U1, and the collector c of the triode Q1 is connected to a parallel circuit composed of the buzzer YH and the light-emitting diode D1.

[0017] Beneficially or exemplarily, as Figure 2 As shown, the power-off time storage circuit includes an optocoupler U2, a single-chip microcomputer U3, and a large-capacity capacitor C2; the first input terminal of the optocoupler U2 is connected to the backup battery E through the power-off detection switch SW2 and the normally closed contact jd of the relay JD, the second input terminal of the optocoupler U2 is connected to the ground terminal GND; the first output terminal of the optocoupler U2 is connected to the detection I / O port of the single-chip microcomputer U3, and the power input terminal of the single-chip microcomputer U3 is connected to the second output terminal of the optocoupler U2 through the large-capacity capacitor C2.

[0018] The working principle of the present utility model is briefly described as follows:

[0019] System normal power supply:

[0020] During normal operation, the linkage switch is turned on, the system power supply switch SW1 and the power-off detection switch SW2 are closed, the system power supply powers the active medical device through the system power supply switch SW1. At the same time, the coil (pins 4 and 5) of the relay JD is energized, the relay JD is energized and attracted, and the normally closed contact jd (pins 1 and 2) of the relay JD is disconnected, cutting off the power supply of the backup battery E to the oscillator U1 and the power-off time storage circuit. The backup battery E cannot supply power to the power-off alarm circuit, and no power-off alarm output and power-off time storage will be generated. The first input terminal (pin 2) of the optocoupler U2 has no power, the first and second output terminals (pins 3 and 4) of the optocoupler U2 are disconnected, the detection I / O port of the single-chip microcomputer is at a high level, and the single-chip microcomputer does not operate.

[0021] System power-off alarm action:

[0022] When the system power supply fails, the relay JD coil (pins 4 and 5) has no power, the normally closed contact jd (pins 1 and 2) of the relay JD is closed, and the positive pole of the backup battery E supplies power to the power input terminal (pin 8) of the oscillator U1 through the normally closed contact jd (pins 1 and 2) of the relay JD and the power failure detection switch SW2. The output terminal (pin 3) of the oscillator U1 outputs a pulse signal which controls the red light-emitting diode D1 and the buzzer YH through the transistor Q1 to emit an audible and visual alarm.

[0023] The oscillator U1 of the power-off alarm circuit uses a 555 chip oscillation circuit. The oscillation frequency is controlled by the resistance values of resistors R1 and R2 and the capacitance value of capacitor C1. It drives the red light-emitting diode D1 alarm light to flash according to the set oscillation frequency, and at the same time drives the buzzer to output intermittent alarm sounds. The frequency of the output alarm sound and light can be adjusted by adjusting the resistance values of resistors R1 and R2 and the capacitance value of capacitor C1.

[0024] The power-off time storage circuit is electrically isolated from the power-off alarm circuit. When the single-chip microcomputer U3 of the power-off time storage circuit is in a power-off state, the large-capacity capacitor C3 is used to provide short-term power.

[0025] When the system power supply fails, the backup battery E supplies power to the first input terminal (pin 2) of the photoelectric coupler U2 through the normally closed contact jd (pins 1 and 2) of the relay JD and the power-off detection switch SW2. The first and second output terminals (pins 3 and 4) of the photoelectric coupler U2 are connected. The microcontroller detects that the I / O port is at a low level, starts the power-off time storage program, completes the power-off time storage, and stores the power-off time in the memory. The power-off time is not lost, and the power-off alarm information can be queried in the alarm list later.

[0026] Normal operation power off:

[0027] During normal operation, the system power supply is disconnected, SW1 and SW2 are disconnected in tandem, and the power-off detection switch SW2 disconnects the backup battery E. Backup battery E cannot power the optocoupler U2. The MCU detects that the I / O port is at a high level and does not operate. During a faulty power-off, the MCU stores the power-off time. During a normal operation power-off, the MCU does not store the power-off time. This allows the user to distinguish between normal operation and faulty power-off.

[0028] Similarly, the power-off detection switch SW2 disconnects the connection between the backup battery E and the power input terminal (pin 8) of the oscillator U1. The backup battery E cannot supply power to the power-off alarm circuit, and no power-off sound and light alarm output is generated.

[0029] Finally, it should also be emphasized that the above description is only the preferred embodiment of the present utility model and is not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions described in the foregoing embodiments without creative efforts, or make equivalent replacements for some of the technical features. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A power-off alarm and power-off time storage circuit suitable for active medical devices, comprising a power-off alarm circuit and a power-off time storage circuit; characterized in that: The power-off alarm circuit and the power-off time storage circuit are connected to the backup battery E through a series circuit composed of a power-off detection switch SW2 and a normally closed contact jd of a relay JD; the relay JD is connected to the system power supply through a system power supply switch SW1; the power-off detection switch SW2 and the system power supply switch SW1 form a linkage switch structure.

2. The power-off alarm and power-off time storage circuit suitable for an active medical device according to claim 1, wherein: The power-off alarm circuit includes an oscillator U1, a triode Q1, a buzzer YH, and a light-emitting diode D1; the power input terminal of the oscillator U1 and the emitter of the triode Q1 are connected to the backup battery E through the power-off detection switch SW2 and the normally closed contact jd of the relay JD, the base of the triode Q1 is connected to the output terminal of the oscillator U1, and the collector of the triode Q1 is connected to a parallel circuit composed of the buzzer YH and the light-emitting diode D1.

3. The power-off alarm and power-off time storage circuit suitable for active medical devices according to claim 1 or 2, characterized in that: The power-off time storage circuit includes an optocoupler U2, a single-chip microcomputer U3, and a large-capacity capacitor C2; the first input terminal of the optocoupler U2 is connected to the backup battery E through the power-off detection switch SW2 and the normally closed contact jd of the relay JD, and the second input terminal of the optocoupler U2 is connected to the ground terminal GND; The first output terminal of the optocoupler U2 is connected to the detection I / O port of the single-chip microcomputer U3, and the power input terminal of the single-chip microcomputer U3 is connected to the second output terminal of the optocoupler U2 through the large-capacity capacitor C2.

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