CN2906631Y

CN2906631Y - Intelligent automatic leakage current tester for medical electric equipment

Info

Publication number: CN2906631Y
Application number: CN 200520047863
Authority: CN
Inventors: 邹任玲; 胡秀枋
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2005-12-22
Filing date: 2005-12-22
Publication date: 2007-05-30
Anticipated expiration: 2015-12-22

Abstract

The utility model relates to an intelligent automatic leakage current testing instrument used on medical electric appliance, mainly comprising a measuring objects choosing module, a leakage current testing module MD, an amplifying and A/D converting module, a central processing unit CPU, a relay matrix driving module, a keyboard input module, a print and display module, a memory module and a power supply of the tested appliance. The measuring objects choosing module is provided with a plurality of accesses connected with the tested medical appliance and each access is connected with a relay contact controlled by the CPU module and connected with an input port of the MD; an output port of the MD is connected with an input port of the amplifying and A/D converting module, whose output port is connected with a data port of the CPU, an output port of the CPU and an input port of the relay matrix driving module in turn; the relay matrix driving module controls the switching of each relay; and the keyboard input module, the print and display module and the memory module are respectively connected with the CPU.

Description

The intelligent leakage current automatic testing equipment of medical electrical equipment

Technical field

The utility model relates to a kind of device that the electrical safety performance of medical electrical equipment is tested, and specifically refers to a kind of leakage current automatic testing equipment of medical electrical equipment.

Background technology

Along with popularizing of medical electrical equipment, because of the malpractice that the equipment leakage current causes of common occurrence.International Electrotechnical Commission had worked out IEC606-1 medical electrical equipment safety general standard in 1978, and China has also worked out mandatory standard GB 9706.1-1995 " medical electrical equipment first: safety general requires ".This standard code the index and the test method of various electrical safety performances of medical electrical equipment, comprise test to various leakage currents.Regulation according to GB9706.1, the electric insulation of medical electrical equipment must make below the numerical value that the electric current that passes insulation is limited in stipulating, and has stipulated the allowable value and the test method of the auxiliary leakage current of continuous Ground leakage current, body leakage stream, patient's leakage current and patient.In the prior art, the device that various leakage currents are tested is arranged, but these devices can not test automatically to various leakage currents, can not carry out intellectuality to test result and handle.

Summary of the invention

The purpose of this utility model is to propose the intelligent leakage current automatic testing equipment of a kind of medical electrical equipment, this device is according to the requirement of GB9706.1 to the equipment leakage current, adopt the microprocessor various leakage currents of test automatically, comprise auxiliary leakage current of Ground leakage current, body leakage stream, patient's leakage current and patient and the numerical value under various malfunctions thereof, measurement result can show on LCD, show this numerical value and allowable value result relatively simultaneously, this measurement result and comparative result can be printed, store and inquire about.

The intelligent leakage current automatic testing equipment of a kind of medical electrical equipment of the present utility model, the power supply that mainly comprises a leakage current test module MD and equipment under test is characterized in that also comprising measuring object selection module, an amplification and A/D modular converter, central processor CPU, a relay matrix driver module and keyboard load module, printing and display module, memory module; Described measuring object selects module to have some access terminals that are connected to tested medical equipment respectively, each inserts terminal and links to each other behind a relay contact of being controlled by described CPU, and link to each other with the input end of described MD, the output terminal of described MD links to each other with the input end of described relay driving module with the data terminal of described CPU, the output terminal of CPU with the output terminal of A/D modular converter with input end, the amplification of A/D modular converter successively with described amplification; Relay driving module is controlled the break-make of each relay, and described keyboard load module, described printing and display module and described memory module link to each other with CPU respectively.

Advantage of the present utility model is and can tests automatically the various leakage currents of medical electrical equipment according to GB9706.1-1995 " medical electrical equipment first: safety general requires ", and test result carried out intelligent analysis, print automatically, data storage and inquiry; Test accurately, intuitive display, is used all easily at test, is applicable to the factory of each Medical Devices and the test and the maintenance of all medical electrical equipments.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model;

Fig. 2 is the circuit diagram that automatic measuring object is selected module 1, MD circuit and amplification and A/D modular converter 3 among Fig. 1;

Fig. 3 is the connection diagram between CPU and demonstration printing interface module 7 and the memory module 8;

Fig. 4 is the circuit diagram of the relay matrix driver module 6 among Fig. 1;

Fig. 5 is the figure of supply line of equipment under test;

Fig. 6 is the connection matrix figure that leads, and shows the annexation of leading end relay and contact matrix thereof.

Embodiment

Now the utility model is described in further detail in conjunction with an embodiment and accompanying drawing.

Circuit structure block diagram of the present utility model as shown in Figure 1, comprise that mainly a measuring object selects module 1, a leakage current test module MD, to amplify and A/D modular converter 3, central processor CPU, a relay matrix driver module 6 and keyboard load module 5, printing and display module 7, memory module 8, and the power supply 9 of equipment under test.

The power circuit of this device by civil power after the transformation rectification, by after the integrated regulator voltage stabilizing to the power supply of each operational module.

Described measuring object selects module to have some incoming ends that are connected to tested medical equipment respectively, present embodiment is 4 incoming ends, shell, external ground end C, the patient who is connected to equipment under test respectively leads and holds PA and PB, each inserts terminal, and (S1～S4) back is continuous through a relay contact by described CPU control, and link to each other with the input end a of described MD, referring to Fig. 2.

As shown in Figure 2, described leakage current test module MD is made up of R1, R2 and C1, and R1 is connected across between the input end and earth terminal of MD, the resistance value of its resistance simulation human body, and R2 and C1 constitute the passive high-frequency filter circuit of L type, and the voltage signal of output is taken out by the C1 two ends.

As Fig. 2, the voltage signal of MD output be sent to amplify with A/D modular converter 3 amplify with the A/D conversion after convert frequency signal to and deliver to CPU and handle.Amplify with A/D modular converter 3 and compose in series by front end circuit QZ, discharge circuit YF, converter circuit BH and voltage-frequency converting circuit V/F.

Front end circuit QZ is made up of the catching diode D1～D4 of the current-limiting resistance R3 that is series at two input ends and R4 and parallel connection.The voltage signal that is taken out by the C1 two ends is behind the current limiting pressure-limiting of resistance R 3 and R4 and D1～D4, amplify by operational amplifier MAX4461H by the YF circuit, through the AC-DC voltage changer AD536RMS/DC of BH circuit the AC voltage conversion of fluctuation is become the DC voltage output of pulsation again, the dc voltage value of output is the root-mean-square valve of input ac voltage, this voltage is transformed into the correspondent frequency signal and send CPU after photoelectricity is isolated after the LM231 voltage-frequency converting circuit carries out the A/D conversion.Referring to Fig. 2.

CPU is connected as shown in Figure 3 with printing and display module 7 and memory module 8.Measurement result shows on LCD show simultaneously more whether the allowable value of this numerical value and standard is passed through after CPU handles, and this measurement result and judged result can be printed, store and be inquired about.

Relay among Fig. 6 and contact matrix S 10～S20 and S30～S40 by the control of CPU to these relay assemblies, can realize the automatic test of combination end leakage current that the single end of patient's leakage current and patient's leakage current respectively lead end.

Referring to Fig. 5; the power supply of equipment under test is powered by a step-up transformer T; requirement with " receive voltage and be maximum amount decides net voltage 110% power supply on " of satisfying GB9706.1 regulation; simultaneously; on phase line L, the neutral line N of this transformer secondary output and protective ground lead E, be connected to contact S5～S7 by the relay of CPU control; wherein one pair of contact S5 is serially connected on the protective ground line; one pair of contact S6 is serially connected on the neutral line N; another pair contact S7 is a switching contact; be connected on the phase line and the neutral line, to realize the requirement of reversal of power.

The circuit diagram of electrical equipment matrix driving module 6 as shown in Figure 4, the data of CPU output and signal are delivered to relay interface driving circuit UCN5842 by the driving of photoelectricity isolation, this schmitt trigger, and its output is connected to the corresponding relays coil respectively, and making its coil electricity, closure is the contact accordingly.S1～S7, PA10～20 and PB30～40 totally 29 relays are arranged, respectively S10～S20, S30～S40 (referring to Fig. 6) in S5～S7 contact (referring to the Fig. 5) in the power supply 9 of S1～S4 contact (referring to the Fig. 2) in the control survey Object Selection module 1, equipment under test and the end connection matrix that leads among the figure.By the control of CPU to each relay on-off combinations of states; can realize easily powering polarity automatic conversion, disconnect the protective ground lead or disconnect a situation such as power lead, to measure normal condition, reversal of power, single failure state or the leakage current during state such as open circuit over the ground.

This device can realize that by keyboard load module 5 individual event manually with automatically detects.When manually detecting, the body leakage stream in the keypad load module 5 detects key, and Ground leakage current detects key, then measures the incoming end relay closes accordingly, realizes the relay group and the reversal of power relay of closed various malfunctions simultaneously in order; During the manual detection of patient's leakage current, the closure end that respectively leads is in order realized the detection of patient's leakage current respectively.When automatically detecting, by detecting key automatically, realize above-mentioned three kinds of leakage currents by Ground leakage current, body leakage stream, patient's leakage current and patient's leakage current respectively lead end leakage current with and detecting automatically one by one at states such as single failure state, reversal of power.

As when measuring body leakage stream, at first CPU pilot relay S1, S5, S6 and S7 closure are measured the body leakage flow valuve of the tested medical equipment under the normal condition, and are stored; Measure the body leakage flow valuve under the single failure state then, CPU closing relay S1 disconnects S5, the body leakage flow valuve of tested medical equipment after the measurement disconnection ground connection, and storage; Then closing relay S1 disconnects S6 and S7, the body leakage flow valuve of tested medical equipment after the measurement reversal of power, and storage etc., all measured values can show on LCD.

Claims

1. intelligent leakage current automatic testing equipment of medical electrical equipment, the power supply that mainly comprises a leakage current test module MD and equipment under test is characterized in that also comprising measuring object selection module, an amplification and A/D modular converter, central processor CPU, a relay matrix driver module and keyboard load module, printing and display module, memory module; Described measuring object selects module to have some incoming ends that are connected to tested medical equipment respectively, each incoming end links to each other behind a relay contact of being controlled by described CPU, and link to each other with the input end of described MD, the output terminal of described MD links to each other with the input end of described relay driving module with the data terminal of described CPU, the output terminal of CPU with the output terminal of A/D modular converter with input end, the amplification of A/D modular converter successively with described amplification; Relay driving module is controlled the break-make of each relay, and described keyboard load module, described printing and display module and described memory module link to each other with CPU respectively.

2. the intelligent leakage current automatic testing equipment of medical electrical equipment according to claim 1, it is characterized in that described measuring object selection module is connected to the incoming end of tested medical equipment, shell, external ground end C, the patient who is connected to equipment under test respectively leads and holds PA and PB.

3. the intelligent leakage current automatic testing equipment of medical electrical equipment according to claim 1, it is characterized in that described leakage current test module MD is made up of R1, R2 and C1, R1 is connected across between measuring junction and the earth terminal, the resistance value of its resistance simulation human body, R2 and C1 constitute the passive high-frequency filter circuit of L type, and the voltage signal of output is taken out by the C1 two ends.

4. the intelligent leakage current automatic testing equipment of medical electrical equipment according to claim 1 is characterized in that described amplification and A/D modular converter are composed in series by front end circuit QZ, discharge circuit YF, converter circuit BH and voltage-frequency converting circuit V/F and photoelectric isolating circuit.

5. the intelligent leakage current automatic testing equipment of medical electrical equipment according to claim 4 is characterized in that described front end circuit QZ is made up of the catching diode D1～D4 of the current-limiting resistance R3 that is series at two input ends and R4 and parallel connection.

6. the intelligent leakage current automatic testing equipment of medical electrical equipment according to claim 1; the power supply that it is characterized in that described equipment under test is by a step-up transformer; and all be connected to contact, and on the phase line and the neutral line, be connected to one pair of switching contact by the relay of CPU control at phase line L, the neutral line N of transformer secondary output and protective ground line E three ends.

7. the intelligent leakage current automatic testing equipment of medical electrical equipment according to claim 1 is characterized in that described relay matrix driver module ₁Circuit form by photoelectric isolating circuit, this schmitt trigger circuit and relay interface driving circuit; The data of CPU output and signal are transported to the relay interface driving circuit by photoelectricity isolation, this schmitt trigger, and its output is connected to the corresponding relays coil respectively.