CN212622998U

CN212622998U - Circuit meeting leakage current requirement of medical equipment in single fault mode

Info

Publication number: CN212622998U
Application number: CN202021249197.XU
Authority: CN
Inventors: 温宇标; 伍倚明; 张永满; 郝成军; 包安文
Original assignee: Shenzhen LongXC Power Supply Co ltd
Current assignee: Shenzhen LongXC Power Supply Co ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2021-02-26
Anticipated expiration: 2030-06-29

Abstract

The utility model discloses a satisfy the circuit that single failure mode medical equipment leaked current and required relates to medical equipment power supply and detects technical field. The device is provided with a sampling device which is used for sampling two signals at a signal end and determining that the controlled equipment is in an effective in-place state; the signal output device is electrically connected with the sampling device and is used for covering all signals and outputting effective power signals; and the in-place detection device is electrically connected with the signal output device and is used for in-place signal combination identification. Under the condition that the control signal terminal is not provided with the controlled equipment, namely under the condition that no covering is arranged, the control signal terminal is exposed and can be touched, but under the single fault mode, the leakage current test can meet the requirements of relevant national standards. Simple structure, convenient operation, safety and reliability.

Description

Circuit meeting leakage current requirement of medical equipment in single fault mode

Technical Field

The utility model discloses a medical equipment power supply detects technical field, especially relates to the circuit that satisfies single failure mode medical equipment and leak current requirement.

Background

Nowadays, human beings are in the times of major medical treatment and major health, and medical care equipment and medical detection equipment are various. Various devices are uneven, and the personal safety of consumers or patients is seriously affected. To medical product leakage current restriction requirement, different products adopt different modes, and some adopt the structure to prevent the touch mode: when the controlled equipment is not in place, the mechanical structure automatically seals the control terminal and prevents leakage. When the controlled device is accessed, the controlled device covers the control signal terminal, so that the human body can be comprehensively ensured not to contact the electric signal terminal. To medical product leakage current restriction requirement, generally adopt structure touch mode: when the controlled equipment is not in place, the mechanical structure automatically seals the control terminal and prevents leakage. When the controlled device is accessed, the controlled device covers the control signal terminal, so that the human body can be comprehensively ensured not to contact the electric signal terminal. The scheme has complex structure and inconvenient operation.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems existing in the related art, the disclosed embodiments provide a circuit that satisfies the leakage current requirement of a single failure mode medical device. The technical scheme is as follows:

the circuit meeting the leakage current requirement of the medical equipment in the single fault mode is provided with a sampling device for sampling two signals at a signal end and determining that the controlled equipment is in an effective in-place state;

the signal output device is electrically connected with the sampling device and is used for covering all signals and outputting effective power signals;

and the in-place detection device is electrically connected with the signal output device and is used for in-place signal combination identification.

In one embodiment, the signal output means is provided with a switching means for controlling the active power signal in two stages.

In one embodiment, the signal source of the active power signal is connected in series with the switch 1, the output terminal of the switch 1 is connected in series with the input terminal of the switch 2, and the output terminal of the switch 2 is connected to the touched signal terminal.

In one embodiment, the control terminals of the switch 1 and the switch 2 are connected to an opto-coupler OP 4.

In one embodiment, two signal terminals of the bit detection device are connected with the MCU _ BPIO5 and the MCU _ GPIO6 through a series resistor 2 and a resistor 3, respectively.

The utility model discloses a technical scheme that embodiment provided can include following beneficial effect:

the utility model discloses with the control signal terminal under the condition that is not controlled equipment, do not have under the condition of cover promptly, the control signal terminal leaks outward and can touch, but under the single failure mode, leak current test can satisfy the requirement of national relevant standard. Simple structure, convenient operation, safety and reliability.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic circuit diagram of the present invention for meeting the leakage current requirement of the medical device in single failure mode.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of other embodiments without departing from the spirit and scope thereof as defined by the appended claims.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," and the like are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Due to medical equipment safety standard requirements: under any condition, at any position of the device which can be touched by a body, a 1K ohm resistor is connected between two arbitrary terminals, and the current flowing through the resistor is less than 100 microamperes. The leakage current requirement is also met in a single internal device or line failure mode. This has two requirements: one requirement is that the voltage signal at the exposed part of the device is less than 0.1V or that a suitably large resistor is connected in series with the output terminal. The second requirement is that the first requirement is also met under a single fault condition. The utility model discloses a based on the problem that exists among the prior art, combine microprocessor electronic technology and produce a simple structure, convenient operation satisfies medical equipment national safety standard's practical circuit simultaneously.

The utility model is suitable for a circuit that the requirement satisfied single failure mode medical equipment and leak current requirement adopts two signal determination at the signal terminal to be controlled the equipment and be in effective state on the throne, when being controlled the equipment back on the throne, covers all signals for the human body no longer contacts any electrically conductive position, then exports the effective power signal again. The active power signal is controlled by two stages, such a mechanism prevents the occurrence of two states: the first is single detection, and a power signal is output to an output touch terminal due to the abnormal signal of a controlled device, so that the leakage current exceeds the standard. I.e., not the active power signal that should be output, is not output under a single detected fault condition. The second state is to control the active power signal output using a two-stage switch. When one switch is in an abnormal state, the effective power signal is not output to the touch terminal under the condition that the controlled device is not covered.

1. The signal source of the effective power signal, such as voltage, current or energy, which needs to be output, is connected in series with the switch 1, the output end of the switch 1 is connected in series with the input end of the switch 2, and the output end of the switch 2 is connected to the signal terminal which can be touched by the human body. When no device under test is available, the signal terminals are exposed, and when the device under test is accessed, the signal terminals are covered.

2. The on and off of the switch 1 is controlled by a photoelectric coupler OP4, the control signal of the photoelectric coupler is controlled by the combination of two different signals MCU _ GPIO1 and MCU _ GPIO2, only when the MCU _ GPIO1 is high level MCU _ GPIO2 is low level, the switch 1 is closed, and the effective power to be output passes through the switch 1.

3. The on and off of the switch 2 is controlled by a photoelectric coupler OP1, the control signal of the photoelectric coupler is controlled by the combination of two different signals MCU _ GPIO3 and MCU _ GPIO4, only when the MCU _ GPIO3 is high level MCU _ GPIO4 is low level, the switch 2 is closed, and the effective power required to be output reaches the tested device through the switch 2.

4. The on-line detection of the tested device: the device under test needs to provide in-place signal 1 and in-place signal 2 for a total of 2 independent signals. The two signals are respectively connected with the MCU _ BPIO5 and the MCU _ GPIO6 in series through a resistor 2 and a resistor 3 for in-place signal combination identification. The resistance values of the resistor 2 and the resistor 3 are large enough to ensure that the leakage current is 100 microamperes when the tested device is not detected.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited only by the attached claims.

Claims

1. The circuit meeting the leakage current requirement of the medical equipment in the single failure mode is characterized in that the circuit meeting the leakage current requirement of the medical equipment in the single failure mode is provided with a sampling device which is used for sampling two signals at a signal end and determining that the controlled equipment is in an effective in-place state;

2. The circuit for meeting a single failure mode medical device leakage current requirement of claim 1, wherein said signal output means is provided with a switching means for two-stage control of the active power signal.

3. The circuit for meeting leakage current requirements of a single failure mode medical device of claim 1, wherein the source of said active power signal is connected in series to switch 1, the output terminal of switch 1 is connected in series to the input terminal of switch 2, and the output terminal of switch 2 is connected to the touched signal terminal.

4. The circuit for meeting the leakage current requirement of the medical equipment with the single failure mode as claimed in claim 3, wherein the control ends of the switch 1 and the switch 2 are connected with a photocoupler OP 4.

5. The circuit for meeting the leakage current requirement of the single failure mode medical device as claimed in claim 1, wherein two signal terminals of the on-site detection device are respectively connected with the MCU _ BPIO5 and the MCU _ GPIO6 through a series resistor 2 and a resistor 3.