CN207782471U - Medical Devices power circuit and Medical Devices - Google Patents

Abstract

A kind of Medical Devices power circuit of the utility model offer and Medical Devices, the circuit includes AC DC conversion module and relay module, wherein, AC DC conversion module includes conversion chip, and conversion chip receives alternating current and exported to relay module after converting alternating current to direct current；Relay module includes relay, and relay includes first coil pin and the second coil pin, and first coil pin receives the direct current of AC DC conversion module output, and the second coil pin is connected to the switch of Medical Devices；Relay further includes exchange input pin and exchange output pin, and exchange input pin receives alternating current, and exchange output pin is connected to voltage output socket, and exchanges input pin and be provided with normal open switch between output pin with exchanging.The Medical Devices use above-mentioned power circuit to power supply for electrical equipment.The utility model can cause switch contact bad to avoid switch oxidation, extend the service life of Medical Devices.

Description

Medical Devices power circuit and Medical Devices

Technical field

The utility model is related to medical instruments fields, switch can be avoided to aoxidize more particularly, to one kind and can not normally supplied The power circuit that the Medical Devices and the Medical Devices of electricity use.

Background technology

Existing Medical Devices use AC power mostly, such as using the alternating current of 220V as power supply.In general, medical treatment is set For standby tool there are one electrical equipment, electrical equipment is connected to AC power by a switch, when the switches are opened, AC power without Normal direction power supply for electrical equipment, after switch is closed, AC power is to power supply for electrical equipment.

Switch used in the current most Medical Devices being electrically connected with city is the rocker type switch of mechanical contact mostly, Wraping plate there are one being set on the panel of this switch, after by the wraping plate of lower switch, movable contact and the stationary contact point contact of switch internal, AC power is by movable contact, stationary contact to power supply for electrical equipment.When the wraping plate of switch is pressed by negative direction, switch internal moves With stationary contact point contact, do not realize that the stopping to electrical equipment is powered in contact.

The contact of this rocker type switch is mostly metal material, is easy to be influenced by environment temperature, humidity, this switch length Phase is operated in the higher environment of humidity, is easy to cause contact surface oxidation, contact impedance increases, when alternating current passes through contact When, heating of contact will be caused, and generating heat will cause contact further to aoxidize, it is straight that switch contact is caused to be carbonized.And what is be carbonized touches Point will further result in fever and poor contact, and after causing switch opening and closing number to reach certain amount, the contact of switch can continue Send out interrupted sparking sound abnormal sound, actually there is air breakdown between contact at this time.After the contact carbonization of switch, Switch will lose the function of opening and closing power grid, in the state being fully disconnected.

Invention content

The main purpose of the utility model is to provide a kind of effective Medical Devices for extending switch service life power supply electricity Road.

The another object of the utility model still is able to ensure good contact performance after being to provide a kind of switch long-time use Medical Devices.

In order to realize above-mentioned main purpose, Medical Devices power circuit provided by the utility model includes AC DC Conversion module and relay module, wherein AC DC conversion module includes conversion chip, and conversion chip receives alternating current simultaneously It is exported to relay module after AC power is converted into direct current；Relay module includes relay, and relay includes first Coil pin and the second coil pin, first coil pin receive the direct current of AC DC conversion module output, the second line Circle pin is connected to the switch of Medical Devices；Relay further includes exchange input pin and exchange output pin, exchange input Pin receives alternating current, and exchange output pin is connected to voltage output socket, and exchange input pin with exchange output pin it Between be provided with normal open switch.

By said program as it can be seen that when the switch that AC DC conversion module is connected to AC power and Medical Devices is closed After, the coil of relay is just powered, at this point, the exchange input pin of relay with exchange output pin between normal open switch close It closes, alternating current will be powered by normal open switch to voltage output socket, thus to power supply for electrical equipment.

In this way, the alternating current on the switch of Medical Devices there is no high pressure passes through, and the direct current of only low pressure passes through, i.e., So that Medical Devices is operated in the higher environment of humidity, due to low pressure direct current switch opening and closing in a flash can't be split It closes and generates electric arc, and the electric current for flowing through switch is very low, usually only milliampere grade, therefore the fever switched is extremely low, it is effectively anti- The only carbonization of switch contact greatly improves the service life of switch block.

One Preferable scheme is that, AC DC conversion module further include exchange input socket, exchange input socket with turn It changes between chip and is provided with protection circuit.

It can be seen that protecting circuit by setting, conversion chip is caused when can be to avoid the voltage fluctuation of AC power Damage, can also avoid the damage of power circuit, extend the service life of power circuit.

Further embodiment is that protection circuit includes the protective tube for being connected to exchange input socket output end, optionally, is protected Protection circuit further includes the varistor being connected between protective tube and conversion chip, alternatively, protection circuit further includes being connected to guarantor Thermistor between danger pipe and conversion chip.

As it can be seen that by the way that the protection device such as protective tube, varistor or thermistor is arranged, can to avoid conversion chip because The overtension of input and cause to damage.

Further embodiment is that relay module further includes the filter circuit being connected between conversion chip and relay, Filter circuit includes the ceramic condenser and electrolytic capacitor being connected in parallel.

It can be seen that the prime of relay is provided with filter circuit, the electric current that AC DC conversion module can be exported It is filtered, it is ensured that be input to the DC current signal of relay and more stablize, avoid work of the fluctuation because of voltage to relay It impacts, can make and influence the power supply of electrical equipment to avoid relay misoperation.

Further scheme is that relay module further includes energization indicating circuit, and the power end of energization indicating circuit connects It is connected on the output end of conversion chip, optionally, energization indicating circuit includes light emitting diode and/or loud speaker, and power end is to hair Optical diode or power speakers.

It can be seen that after setting energization indicating circuit, medical staff can facilitate the working condition for understanding power circuit, such as Whether power circuit is powered, and influences the normal works of Medical Devices to avoid medical staff's maloperation power circuit.

For the another object for realizing above-mentioned, Medical Devices provided by the utility model have electrical equipment and above-mentioned doctor Treatment sets stand-by power supply circuit, and the voltage output socket of Medical Devices power circuit is to power supply for electrical equipment.

By said program as it can be seen that the utility model is the break-make for controlling alternating current by the direct current of low pressure, that is, exchanging DC conversion modules are connected to after AC power and the switch closure of Medical Devices, and the coil of relay is just powered, and By relay, voltage output socket to power supply for electrical equipment.Therefore, there is no the alternating currents of high pressure on the switch of Medical Devices Pass through, and the direct current of only low pressure passes through, and the direct current of low pressure switch can't be generated in a flash in switch opening and closing Electric arc, and the electric current for flowing through electrical equipment switch is very low, and switch fever is extremely low, effectively prevent the carbonization of switch contact, greatly The big service life for improving switch block.

Description of the drawings

Fig. 1 is the electric functional block diagram of the utility model Medical Devices power circuit embodiment.

Fig. 2 is the electrical schematic diagram of the utility model Medical Devices power circuit embodiment.

The utility model is described in further detail with reference to the accompanying drawings and embodiments.

Specific implementation mode

The Medical Devices of the utility model are active medical equipment, especially with AC power Medical Devices, are such as used The Medical Devices of 220V alternating currents, and there is electrical equipment, such as motor in Medical Devices.In addition, being equipped with electricity in Medical Devices Source circuit, power circuit is for receiving alternating current and to power supply for electrical equipment.

Referring to Fig. 1, the Medical Devices power circuit of the present embodiment includes AC DC conversion module 11, relay module 12 and switch 13, wherein AC DC conversion module 11 is connected to AC network 10, such as the AC network of 220V.Exchange is straight Stream conversion module 11 converts alternating current to the direct current of low pressure and exports to relay module 12.Relay module 12, which receives, to be handed over The direct current that DC conversion modules 11 export is flowed, and is worked under the control of the direct current, and also receives AC network 10 Alternating current.Switch 13 is connected to relay module 12, and relay module 12 is defeated to electrical equipment 15 according to the state of switch 13 Go out alternating current.

The structure and operation principle of the power circuit of the present embodiment are discussed in detail with reference to Fig. 2.The friendship of power circuit It includes conversion chip U1, exchange input socket J1 and protection circuit to flow DC conversion modules 11, exchanges input socket J1 connections To AC network 10, and from AC network 10 receive 220V High Level AC Voltage.

Protection is electrically connected between exchange input socket J1 and conversion chip U1, wherein the pin 1,2 of conversion chip U1 For input pin, for receiving AC power.Conversion core is influenced in order to avoid the AC supply voltage fluctuation of AC network 10 The work of piece U1, therefore connect protection circuit in the input pin of conversion chip U1.

In the present embodiment, protection circuit includes protective tube F1, varistor Rmov and thermistor Rntc, wherein is protected One end of dangerous pipe F1 is connected on exchange input socket J1, and the both ends of varistor Rmov are respectively connected to protective tube F1 and turn Change an input pin of chip U1, and the both ends of thermistor Rntc are another to protective tube F1 and conversion chip U1 respectively A input pin.

In this way, after the alternating current of the output of AC network 10 is by exchanging input socket J1, then through protective tube F1, pressure-sensitive electricity After hindering Rmov, thermistor Rntc, it is powered to the 1st foot of conversion chip U1 and the 2nd foot.When the electricity that AC network 10 inputs When flowing through big, protective tube F1 will be burned out and disconnect the connection of exchange input socket J1 and conversion chip U1, and in AC network When the overtension of 10 inputs, the resistance of varistor Rmov also reduces therewith, to reduce the electricity for being input to conversion chip U1 Pressure.When the temperature of thermistor Rntc increases, the resistance value of thermistor Rntc also accordingly increases, and conversion is input to reduce The electric current of chip U1 forms protective effect to conversion chip U1.

Preferably, since the power circuit of the present embodiment is connected to AC network, and Medical Devices are also to use high pressure Alternating current, conversion chip U1 need the core for selecting to disclosure satisfy that input has the isolation voltage requirement for exchanging 4000V with outlet chamber Piece.

Conversion chip U1 by the converting high-voltage alternating current into low-voltage direct current of 220V, such as be converted into 24V direct current it is defeated Go out, DC power supply is exported by pin 3,4.The direct current of conversion chip U1 outputs will be exported to relay module 12, to quilt Relay U2 is received.

In the present embodiment, relay module 12 include relay U2, also, relay U2 be one have 2 poles Normal-open type relay, as shown in Figure 2, the pin 5 and pin 6 of relay U2 are coil pin, are used for control coil, that is, Pin 5 is respectively connected to the both ends of the Inside coil of relay U2 with pin 6.Preferably, due to the power circuit of the present embodiment It is connected to AC network 10, and Medical Devices are also the alternating current using high pressure, therefore, relay U2, which is also required to selection, to expire Foot input has the relay that the isolation voltage for exchanging 4000V requires with outlet chamber.

In addition, there are two normal open switch for setting in relay U2, and two exchange input pins are also set up in relay U2 And two exchange output pins, wherein the pin 3,4 of relay U2 is exchange input pin respectively, and pin 1,2 is respectively Exchange output pin.The both ends of one normal open switch are respectively connected to pin 1,3, and the both ends of another normal open switch are separately connected To pin 2,4.

It is provided with filter circuit between AC DC conversion module 11 and relay U2, in the present embodiment, filter circuit Including the ceramic condenser C1 being connected in parallel and electrolytic capacitor C2, the direct current for being exported to conversion chip U1 is filtered.And And filter circuit passes through resistance R1 by the first coil pin of electric signal output to relay U2, i.e., on pin 5.And relay One contact portion of the second coil pin of U2, i.e. pin 6 and the switch 13 of Medical Devices, is such as connected to the one of switch SW1 On a contact, optionally, another contact ground of switch SW1.In the present embodiment, resistance R1 is the limit of the coil of relay U2 Leakage resistance, for avoiding the electric current of flowing through coil excessive.The switch 13 of the present embodiment can be the switch for having mechanical contact, example Common rocker type switch on the medical instrument such as being connect with AC network 10, i.e. rocker switch etc..

In the present embodiment, pin 3 and pin 1, the pin 2 and pin 4 of relay U2 separately constitute switch control circuit, and two A exchange input pin, i.e. pin 3,4 are connect with AC network 10 respectively, are such as connected to the firewire and zero of exchange input socket J1 On line, and two exchange output pins, i.e. pin 1,2 are respectively connected to exchange accessory power outlet J2.

In addition, relay module 12 is additionally provided with energization indicating circuit, in the present embodiment, energization indicating circuit includes shining The anode of diode D1 and resistance R2, light emitting diode D1 are connected to resistance R2, and one end of resistance R2 is connected to power end, Wherein, power end can be connected to the output end of conversion chip U1, can also actually be connected to the output end of filter circuit.When When conversion chip U1 has electric current output, the direct current of output drives light emitting diode D1 to shine by resistance R2, to indicate electricity Source circuit module is in running order.

In actual application, loud speaker can also be arranged to substitute light emitting diode D1, Huo Zhetong in energization indicating circuit When setting light emitting diode D1 and loud speaker, power end is respectively to light emitting diode D1 and power speakers.

The operation principle of the power circuit of the present embodiment is introduced with reference to Fig. 2.When Medical Devices pass through power cord and friendship Galvanic electricity net 10 connect when, that is, exchange input socket J1 connect with AC network 10, alternating current by exchange input socket J1 and It is powered from the protection circuit that protective tube F1, thermistor Rntc, varistor Rmov are formed to conversion chip U1, conversion chip U1 Two output pins output 24V direct current, and exported to relay module by resistance R1.

At this point, in the state that the switch SW1 when Medical Devices is in and opens, because the coil of relay U2 is in open circuit shape State, no current pass through.Therefore, relay U2 is in normally open, i.e. the normal open switch of relay U2 is in the open state, also It is that pin 3 and the switch of pin 1 are in an open state, and pin 4 and the switch of pin 2 are in an open state.In this way, exchange output is inserted Seat J2 Non voltage outputs, Medical Devices are in off-position.

When the switch SW1 on Medical Devices is pressed and in the closure state, then the coil of relay U2 has electric current logical It crosses, the normal open switch of relay U2 becomes closed state from opening state, i.e. the pin 3 of relay U2 and the switch of pin 1 is Closed state, and the switch of pin 4 and pin 2 is also closed state.In this way, AC network 10 input alternating current respectively pass through after Two exchange input pins of electric appliance U2 are transferred to exchange accessory power outlet J2 by two exchange output pins, are thus set to medical treatment Available electricity.

As it can be seen that in the embodiment of the utility model, the switch of power circuit does not have alternating current and flows through, and only flows through Low voltage direct current, even if the contact of switch is influenced by ambient environmental factors because usage time is longer and surface is caused to occur gently Micro- oxidation, finally causes contact impedance to become larger, and still ensures that the normal work of product, has prevented because of switch contact oxidation, carbon Change causes poor contact and leads to the contact abnormal sound occurred during the energization, avoids the puzzlement of clinical staff, improves production The quality of product.

Therefore, the utility model can solve the switch of contact-carrying used in active medical equipment because contact oxidation, fever are drawn The problems such as contact carbonization risen and poor contact, to effectively extend the service life of product switch block, and effectively avoids product from existing During use, heating of contact and abnormal sound phenomenon caused by contact oxidation.

Finally it is emphasized that the present invention is not limited to the above embodiments, such as conversion chip and relay class The variations such as change, filter circuit or the in-built change of energization indicating circuit of type should also be included in the utility model power In the protection domain that profit requires.

Claims (10)

1. Medical Devices power circuit, which is characterized in that including：

AC DC conversion module and relay module；

The AC DC conversion module includes conversion chip, and the conversion chip receives alternating current and converts alternating current to straight It is exported to the relay module after galvanic electricity；

The relay module includes relay, and the relay includes first coil pin and the second coil pin, described First coil pin receives the direct current of the AC DC conversion module output, and the second coil pin is connected to medical treatment and sets Standby switch；

The relay further includes that exchange input pin and exchange output pin, the exchange input pin receive alternating current, The exchange output pin is connected to voltage output socket, and the exchange input pin is set with described exchange between output pin It is equipped with normal open switch.

2. Medical Devices power circuit according to claim 1, it is characterised in that：

The AC DC conversion module further includes exchange input socket, between the exchange input socket and the conversion chip It is provided with protection circuit.

3. Medical Devices power circuit according to claim 2, it is characterised in that：

The protection circuit includes the protective tube for being connected to the exchange input socket output end.

4. Medical Devices power circuit according to claim 3, it is characterised in that：

The protection circuit further includes the varistor being connected between the protective tube and the conversion chip.

5. Medical Devices power circuit according to claim 3, it is characterised in that：

The protection circuit further includes the thermistor being connected between the protective tube and the conversion chip.

6. Medical Devices power circuit according to any one of claims 1 to 5, it is characterised in that：

The relay module further includes the filter circuit being connected between the conversion chip and the relay.

7. Medical Devices power circuit according to claim 6, it is characterised in that：

The filter circuit includes the ceramic condenser and electrolytic capacitor being connected in parallel.

8. Medical Devices power circuit according to any one of claims 1 to 5, it is characterised in that：

The relay module further includes energization indicating circuit, and the power end of the energization indicating circuit is connected to the conversion core The output end of piece.

9. Medical Devices power circuit according to claim 8, it is characterised in that：

The energization indicating circuit includes light emitting diode and/or loud speaker, and the power end is to the light emitting diode or institute State power speakers.

10. Medical Devices, it is characterised in that：Including

Electrical equipment and Medical Devices power circuit as described in any one of claim 1 to 9, the Medical Devices electricity consumption The voltage output socket of source circuit is to the power supply for electrical equipment.