CN211127565U - Special power filter for EMI alternating current medical equipment - Google Patents
Special power filter for EMI alternating current medical equipment Download PDFInfo
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- CN211127565U CN211127565U CN201921795577.0U CN201921795577U CN211127565U CN 211127565 U CN211127565 U CN 211127565U CN 201921795577 U CN201921795577 U CN 201921795577U CN 211127565 U CN211127565 U CN 211127565U
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Abstract
The utility model discloses a special power filter of EMI alternating-current medical instrument belongs to electron technical field, including surge protector, EMI filter circuit, rectifier circuit, DC-DC module, band elimination filter and high frequency filter circuit, solved traditional EMI filter and can not carry out the filtering to the high frequency interference source that GPRS or 4G wireless communication module produced, also not have the technical problem of carrying out the filtering to specific high frequency interference source, the utility model discloses a band elimination filter carries out the filtering to specific frequency's interference source, through adjusting the adjustable resistance in the two T networks of RC, can carry out the band elimination filtering according to actual need, very big improvement the effect of filtering, the utility model discloses still be equipped with the filter capacitance who is specially to the produced high frequency interference source of GPRS or 4G wireless communication module, be fit for present medical instrument's demand.
Description
Technical Field
The utility model belongs to the technical field of the electron, especially, relate to a special power filter of EMI alternating-current medical instrument.
Background
The implementation of YY/T0505-2012 electromagnetic compatibility provides related index requirements and detection methods for electromagnetic compatibility of medical equipment, a power line is an important way for electromagnetic interference (EMI) to enter and exit equipment, and a power filter board is installed at an entrance of a power supply of the equipment, so that the electromagnetic interference transmission way can be effectively cut off.
The traditional EMI filter is shown in figure 1 and is composed of a common-mode inductor and a filter capacitor network, because most of interference sources of GPRS or 4G wireless communication modules added in the existing medical equipment have high-frequency interference of electrical appliances connected in series through a mains supply power supply circuit and high-frequency interference of 900MHz or above caused by the GPRS or 4G wireless communication modules carried by the medical equipment, the traditional EMI filter is hard to filter certain series-connected high-frequency interference because the capacitance value of the filter capacitor network of the traditional EMI filter is solidified and the filter frequency of the traditional EMI filter is fixed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a special power filter of EMI alternating current medical instrument has solved traditional EMI wave filter and can not carry out the filtering to the high frequency interference source that GPRS or 4G wireless communication module produced, also does not have the technical problem who carries out the filtering to specific high frequency interference source.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a power filter special for EMI alternating current medical equipment comprises a surge protector, an EMI filter circuit, a rectifier circuit, a DC-DC module, a band elimination filter and a high-frequency filter circuit, wherein 220V mains supply is connected with the input end of the EMI filter circuit through the surge protector, the output end of the EMI filter circuit is connected with the input end of the rectifier circuit, the output end of the rectifier circuit is connected with the input end of the DC-DC module, and the output end of the DC-DC module outputs a power supply through the band elimination filter and the high-frequency filter circuit;
the band-elimination filter comprises an amplifier IC2, an adjustable resistor R2, a capacitor C8, a resistor R1, a resistor R5, a capacitor C4, a capacitor C5, a capacitor C9, a resistor R6, a resistor R7 and a resistor R8, wherein the adjustable resistor R2, the capacitor C8, the resistor R1, the resistor R5, the capacitor C4 and the capacitor C5 form an RC double-T network, the capacitor C9, the resistor R6, the resistor R7 and the resistor R8 form an RC single-T network, the RC double-T network, the RC single-T network and the amplifier IC2 form the band-elimination filter, and the input end of the amplifier IC2 is the output end of the band-elimination filter.
Preferably, the surge protector is composed of a voltage dependent resistor R3 and a voltage dependent resistor R4, the EMI filter circuit includes an inductor L1, an inductor L2, a capacitor C6, a capacitor C1 and a capacitor C3, the inductor L1 and the inductor L2 constitute a common mode inductor, an input end of the common mode inductor is connected to a ground line FG through the voltage dependent resistor R3 and the voltage dependent resistor R4, an input end of the common mode inductor is further connected to a live line and a neutral line of the 220V commercial power, an output end of the common mode inductor is connected to the ground line FG through the capacitor C1 and the capacitor C3, a capacitor C6 is further connected between output ends of the common mode inductor, and an output end of the common mode inductor is an output end of the EMI filter circuit.
Preferably, the rectifying circuit is composed of a rectifying bridge B1, the input end of the DC-DC module is connected with the output end of the rectifying bridge B1, and the input end of the DC-DC module is further connected with a filter capacitor C2.
Preferably, in the RC dual T network, pin 1 of the resistor R1 is an input end of the band-stop filter, pin 1 of the resistor R1 is connected to an output end of the DC-DC module, pin 2 of the resistor R1 is connected to a positive input end of the amplifier IC2 through a resistor R5, one end of the capacitor C4 is connected to pin 1 of the capacitor R1, the other end of the capacitor C5 is connected to a positive input end of the amplifier IC2, a connection node of the capacitor C4 and the capacitor C5 is connected to an input end of the amplifier IC2 through an adjustable resistor R2, and an output end of the amplifier IC2 is connected to a positive input end of the amplifier IC2 through a capacitor C8 and a resistor R5;
in the RC single T network, a negative input end of an amplifier IC2 is connected with an output end of an amplifier IC2 through a resistor R7, an output end of an amplifier IC2 is also connected with a negative input end of an amplifier IC2 through a resistor R8 and a resistor R6 which are connected in series, and a connecting node of the resistor R6 and the resistor R8 is connected with a ground line GND through a capacitor C6.
Preferably, the high-frequency filter circuit comprises a capacitor C10 and a capacitor C11, the capacitor C10 is a 22P capacitor, the capacitor C11 is a 33P capacitor, and the output end of the amplifier IC2 is connected to the ground GND through a capacitor C10 and a capacitor C11 which are connected in parallel.
Preferably, the ground line FG is a large ground line of 220V commercial power, and the ground line GND is a ground line provided at the output end of the DC-DC module.
Preferably, the amplifier IC2 has model number SN 72741.
A special power filter of EMI alternating-current medical instrument, solved traditional EMI wave filter and can not carry out filtering to the high frequency interference source that GPRS or 4G wireless communication module produced, also do not have the technical problem of carrying out filtering to specific high frequency interference source, the utility model discloses a band elimination filter carries out filtering to specific frequency's interference source, through adjusting the adjustable resistance in the two T networks of RC, can carry out band elimination filtering according to actual need, very big improvement the effect of filtering, the utility model discloses still be equipped with the filter capacitance who is specially to the produced high frequency interference source of GPRS or 4G wireless communication module, be fit for present medical instrument's demand.
Drawings
FIG. 1 is a circuit diagram of a conventional EMI filter circuit;
fig. 2 is a block diagram of the circuit diagram of the present invention;
fig. 3 is a circuit diagram of the present invention.
Detailed Description
The power filter special for the EMI alternating-current medical equipment shown in fig. 1 to 3 comprises a surge protector, an EMI filter circuit, a rectifier circuit, a DC-DC module, a band elimination filter and a high-frequency filter circuit, wherein 220V mains supply is connected with the input end of the EMI filter circuit through the surge protector, the output end of the EMI filter circuit is connected with the input end of the rectifier circuit, the output end of the rectifier circuit is connected with the input end of the DC-DC module, and the output end of the DC-DC module outputs a power supply through the band elimination filter and the high-frequency filter circuit;
the band-elimination filter comprises an amplifier IC2, an adjustable resistor R2, a capacitor C8, a resistor R1, a resistor R5, a capacitor C4, a capacitor C5, a capacitor C9, a resistor R6, a resistor R7 and a resistor R8, wherein the adjustable resistor R2, the capacitor C8, the resistor R1, the resistor R5, the capacitor C4 and the capacitor C5 form an RC double-T network, the capacitor C9, the resistor R6, the resistor R7 and the resistor R8 form an RC single-T network, the RC double-T network, the RC single-T network and the amplifier IC2 form the band-elimination filter, and the input end of the amplifier IC2 is the output end of the band-elimination filter.
Preferably, the surge protector is composed of a voltage dependent resistor R3 and a voltage dependent resistor R4, the EMI filter circuit includes an inductor L1, an inductor L2, a capacitor C6, a capacitor C1 and a capacitor C3, the inductor L1 and the inductor L2 constitute a common mode inductor, an input end of the common mode inductor is connected to a ground line FG through the voltage dependent resistor R3 and the voltage dependent resistor R4, an input end of the common mode inductor is further connected to a live line and a neutral line of the 220V commercial power, an output end of the common mode inductor is connected to the ground line FG through the capacitor C1 and the capacitor C3, a capacitor C6 is further connected between output ends of the common mode inductor, and an output end of the common mode inductor is an output end of the EMI filter circuit.
After the 220V mains supply is protected by the surge protector, the surge threat can be well eliminated, and in the embodiment, models of the piezoresistor R3 and the piezoresistor R4 are MYN 15-681K.
Because EMI filter circuit can not strain the interference source of all frequencies, so in the later stage circuit, the utility model discloses band elimination filter has been added.
Preferably, the rectifying circuit is composed of a rectifying bridge B1, the input end of the DC-DC module is connected with the output end of the rectifying bridge B1, and the input end of the DC-DC module is further connected with a filter capacitor C2.
Preferably, in the RC dual T network, pin 1 of the resistor R1 is an input end of the band-stop filter, pin 1 of the resistor R1 is connected to an output end of the DC-DC module, pin 2 of the resistor R1 is connected to a positive input end of the amplifier IC2 through a resistor R5, one end of the capacitor C4 is connected to pin 1 of the capacitor R1, the other end of the capacitor C5 is connected to a positive input end of the amplifier IC2, a connection node of the capacitor C4 and the capacitor C5 is connected to an input end of the amplifier IC2 through an adjustable resistor R2, and an output end of the amplifier IC2 is connected to a positive input end of the amplifier IC2 through a capacitor C8 and a resistor R5;
in the RC single T network, a negative input end of an amplifier IC2 is connected with an output end of an amplifier IC2 through a resistor R7, an output end of an amplifier IC2 is also connected with a negative input end of an amplifier IC2 through a resistor R8 and a resistor R6 which are connected in series, and a connecting node of the resistor R6 and the resistor R8 is connected with a ground line GND through a capacitor C6.
The utility model discloses a band elimination filter be Q value adjustable band elimination filter, its Q value changes and does not have any influence to the trapped wave frequency, the stability of its trapped wave frequency and Q value is the passive component who depends on in the two T networks of RC, wherein can adjust the trapped wave frequency through the resistance of adjusting resistance R2 and electric capacity C8's appearance value, in this embodiment, it is fixed with resistance C8's appearance value, regard resistance R2 as adjustable resistance, adjust the trapped wave frequency through adjusting resistance R2's resistance.
Preferably, the high-frequency filter circuit comprises a capacitor C10 and a capacitor C11, the capacitor C10 is a 22P capacitor, the capacitor C11 is a 33P capacitor, and the output end of the amplifier IC2 is connected to the ground GND through a capacitor C10 and a capacitor C11 which are connected in parallel.
Because GPRS or 4G wireless communication module do not go into from the supply circuit of commercial power in the cluster, but go into from ground wire GND in the cluster, so EMI circuit in the circuit in earlier stage can not carry out effectual filtering to it, need add high frequency filter circuit in addition at band elimination filter's output and filter, the utility model discloses a 22P and 33P electric capacity are filtered this signal.
Preferably, the ground line FG is a large ground line of 220V commercial power, and the ground line GND is a ground line provided at the output end of the DC-DC module.
Preferably, the amplifier IC2 has model number SN 72741.
When the voltage value of the output end of the amplifier IC2 is detected through an oscilloscope, the frequency value of an interference source which is connected to the output end of the amplifier IC2 in a field is found through the oscilloscope, the resistance value of a resistor R2 is calculated through the following formula, F is 1/(R2 × C8), wherein F is a trap frequency and is measured through the oscilloscope, C8 is the capacitance value of a capacitor C8 and is a fixed value, and the capacitor with the fixed capacitance value is adopted during processing.
A special power filter of EMI alternating-current medical instrument, solved traditional EMI wave filter and can not carry out filtering to the high frequency interference source that GPRS or 4G wireless communication module produced, also do not have the technical problem of carrying out filtering to specific high frequency interference source, the utility model discloses a band elimination filter carries out filtering to specific frequency's interference source, through adjusting the adjustable resistance in the two T networks of RC, can carry out band elimination filtering according to actual need, very big improvement the effect of filtering, the utility model discloses still be equipped with the filter capacitance who is specially to the produced high frequency interference source of GPRS or 4G wireless communication module, be fit for present medical instrument's demand.
Claims (7)
1. A special power filter for EMI alternating current medical equipment is characterized in that: the commercial power supply system comprises a surge protector, an EMI filter circuit, a rectifying circuit, a DC-DC module, a band elimination filter and a high-frequency filter circuit, wherein 220V commercial power is connected with the input end of the EMI filter circuit through the surge protector, the output end of the EMI filter circuit is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the DC-DC module, and the output end of the DC-DC module outputs a power supply through the band elimination filter and the high-frequency filter circuit;
the band-elimination filter comprises an amplifier IC2, an adjustable resistor R2, a capacitor C8, a resistor R1, a resistor R5, a capacitor C4, a capacitor C5, a capacitor C9, a resistor R6, a resistor R7 and a resistor R8, wherein the adjustable resistor R2, the capacitor C8, the resistor R1, the resistor R5, the capacitor C4 and the capacitor C5 form an RC double-T network, the capacitor C9, the resistor R6, the resistor R7 and the resistor R8 form an RC single-T network, the RC double-T network, the RC single-T network and the amplifier IC2 form the band-elimination filter, and the input end of the amplifier IC2 is the output end of the band-elimination filter.
2. The EMI alternating current medical equipment dedicated power filter as claimed in claim 1, wherein the surge protector is composed of a voltage dependent resistor R3 and a voltage dependent resistor R4, the EMI filter circuit includes an inductor L1, an inductor L2, a capacitor C6, a capacitor C1 and a capacitor C3, the inductor L1 and the inductor L2 constitute a common mode inductor, an input end of the common mode inductor is connected to a ground line FG through a voltage dependent resistor R3 and a voltage dependent resistor R4, an input end of the common mode inductor is further connected to a live line and a neutral line of the 220V mains supply, an output end of the common mode inductor is connected to the ground line FG through a capacitor C1 and a capacitor C3, a capacitor C6 is further connected between output ends of the common mode inductor, and an output end of the common mode inductor is an output end of the EMI filter circuit.
3. The power filter for EMI ac medical instruments as recited in claim 1, wherein: the rectifying circuit is composed of a rectifying bridge B1, the input end of the DC-DC module is connected with the output end of the rectifying bridge B1, and the input end of the DC-DC module is also connected with a filter capacitor C2.
4. The power filter for EMI ac medical instruments as recited in claim 1, wherein: in the RC double T network, pin 1 of resistor R1 is an input end of the band-stop filter, pin 1 of resistor R1 is connected to an output end of the DC-DC module, pin 2 of resistor R1 is connected to a positive input end of amplifier IC2 through resistor R5, one end of capacitor C4 is connected to pin 1 of capacitor R1, and the other end is connected to one end of capacitor C5, the other end of capacitor C5 is connected to a positive input end of amplifier IC2, a connection node between capacitor C4 and capacitor C5 is connected to an input end of amplifier IC2 through adjustable resistor R2, and an output end of amplifier IC2 is connected to a positive input end of amplifier IC2 through capacitor C8 and resistor R5;
in the RC single T network, a negative input end of an amplifier IC2 is connected with an output end of an amplifier IC2 through a resistor R7, an output end of an amplifier IC2 is also connected with a negative input end of an amplifier IC2 through a resistor R8 and a resistor R6 which are connected in series, and a connecting node of the resistor R6 and the resistor R8 is connected with a ground line GND through a capacitor C6.
5. The power filter for EMI ac medical instruments as recited in claim 2, wherein: the high-frequency filter circuit comprises a capacitor C10 and a capacitor C11, wherein the capacitor C10 is a 22P capacitance value capacitor, the capacitor C11 is a 33P capacitance value capacitor, and the output end of the amplifier IC2 is connected with a ground wire GND through the capacitor C10 and the capacitor C11 which are connected in parallel.
6. The power filter for EMI ac medical instruments as recited in claim 5, wherein: the ground wire FG is a large ground wire of 220V commercial power, and the ground wire GND is a ground wire provided by the output end of the DC-DC module.
7. The power filter for EMI ac medical instruments as recited in claim 5, wherein: the amplifier IC2 is model number SN 72741.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921795577.0U CN211127565U (en) | 2019-10-24 | 2019-10-24 | Special power filter for EMI alternating current medical equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921795577.0U CN211127565U (en) | 2019-10-24 | 2019-10-24 | Special power filter for EMI alternating current medical equipment |
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| CN211127565U true CN211127565U (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142718A (en) * | 2021-11-18 | 2022-03-04 | 珠海英搏尔电气股份有限公司 | Active power factor correction circuit, switching power supply and vehicle |
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2019
- 2019-10-24 CN CN201921795577.0U patent/CN211127565U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142718A (en) * | 2021-11-18 | 2022-03-04 | 珠海英搏尔电气股份有限公司 | Active power factor correction circuit, switching power supply and vehicle |
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