CN209057106U - A kind of protection type filter circuit - Google Patents
A kind of protection type filter circuit Download PDFInfo
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- CN209057106U CN209057106U CN201821930196.4U CN201821930196U CN209057106U CN 209057106 U CN209057106 U CN 209057106U CN 201821930196 U CN201821930196 U CN 201821930196U CN 209057106 U CN209057106 U CN 209057106U
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- 238000001914 filtration Methods 0.000 claims abstract description 41
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The utility model provides a kind of protection type filter circuit, comprising the first inductance L1, the second inductance L2, post-filtering circuit and protection indicating circuit, and it is equipped with reference ground；The positive input terminal of protection type filter circuit is connected through the first inductance L1 with the positive input terminal of post-filtering circuit；The negative input end of protection type filter circuit is connected through the second inductance L2 with the negative input end of post-filtering circuit；The positive input terminal of protection type filter circuit, negative input end, reference ground are connected separately with overshoot voltage protective module between any two, and overshoot voltage protective module includes varistor and the thermal fuse being independently arranged；Thermal fuse and the thermally conductive connection of varistor；The thermal fuse of each overshoot voltage protective module is connected in series.The utility model proposes a kind of protection type filter circuit can monitor varistor febrile state and Zapping circuit, protect varistor not to be burned.
Description
Technical field
The utility model relates to wave filter technology fields, and in particular to a kind of protection type filter circuit.
Background technique
Equipment of the filter as the noise signal in circuit is filtered out, is widely used in electronic equipment of various,
It is special procured in field in communication equipment, aerospace, on-board equipment etc., electromagnetic environment bandwidth, field strength is big.
Existing multiple filter generally comprises multiple filter circuits, is usually connected with multiple reactance elements in filter circuit
Part, such as in load resistance both ends shunt capacitor or series inductance, and the compound filtering as made of several electric currents, inductor combination
Circuit achievees the effect that reduce the alternating component in the DC voltage of pulsation by multi-layer filtering.
Wherein, in order to protect the circuit element in filter circuit from the injury of pulse voltage, often in each voltage swell
Section connection varistor carries out circuit protection.When flowing through varistor voltage is more than that voltage is used continuously in maximum, varistor
Cracking, and then abnormal heating occurs, or even has the risk for generating fire.And after pressure responsive resistor failure, it not can guarantee to filter
The protection of each reactance component in wave circuit rear end is easy to cause secondary injury to filter circuit under over-voltage condition.Therefore, at present
It needs one kind that can monitor varistor normal operating conditions, extends the service life of varistor, protect each filter reactance member
The protection type filter circuit of part.
Utility model content
Problem to be solved in the utility model is to provide one kind for the above-mentioned deficiency in the presence of the prior art and pass through
The thermal fuse and the thermally conductive connection of varistor being independently arranged, and by protecting indicating circuit that can monitor varistor
Working condition, reach protection each element purpose of filtering unit protection type filter circuit.
To achieve the above object, the utility model uses the following technical solution:
A kind of protection type filter circuit, includes the first inductance L1, the second inductance L2, and post-filtering circuit and protection instruction are electric
Road, and it is equipped with reference ground；Positive input of the positive input terminal of protection type filter circuit through the first inductance L1 and post-filtering circuit
End is connected；The negative input end of protection type filter circuit is connected through the second inductance L2 with the negative input end of post-filtering circuit；Protection
The positive input terminal of type filter circuit, negative input end, reference ground are connected separately with overshoot voltage protective module between any two, described
Overshoot voltage protective module includes varistor and the thermal fuse being independently arranged, wherein thermal fuse and varistor
Thermally conductive connection；The thermal fuse of each overshoot voltage protective module is connected in series, and whole one end and post-filtering circuit are just defeated
Enter end to be connected, the other end is connected through protection indicating circuit with the negative input end of post-filtering circuit.
Further, the protection indicating circuit includes sequentially connected light emitting diode D1, zener diode D2 and limit
Leakage resistance R4；The anode of the light emitting diode D1 is connected with the output end of overshoot voltage protective module；The light emitting diode
The cathode of D1 is connected with the anode of zener diode D2；The cathode of the zener diode D2 and current-limiting resistance R4 input terminal phase
Even；The current-limiting resistance R4 output end is connected with the negative input end of post-filtering circuit.
Further, the overshoot voltage protective module also includes concatenation thermal fuse；The concatenation thermal fuse
It is connected in series with varistor.
Further, the post-filtering circuit positive input terminal, negative input end and reference ground are also distinguished simultaneously between any two
It is connected to bi-directional voltage stabilizing diode.
Further, the post-filtering circuit includes common mode inductance L3, the first filter capacitor C1, the second filter capacitor
C2, the first decoupling capacitance C3 and the second decoupling capacitance C4；The output end of the filter circuit is connect with common mode inductance L3；Described
One filter capacitor C1 is connected across common mode inductance L3 input terminal；The second filter capacitor C2 is connected across common mode inductance L3 output end；
Whole in parallel with the output end of post-filtering circuit after the first decoupling capacitance C3 and the second decoupling capacitance C4 connection, first moves back
The junction of coupling capacitor C3 and the second decoupling capacitance C4 are connected with reference ground.
The working principle and beneficial effect of the utility model are as follows: it carries out filtering out DC voltage by post-filtering circuit, and
Too high voltages are filtered out using the peak absorbing characteristic of the first inductance L1, the second inductance L2；By varistor to filter circuit
Input terminal and the further pressure stabilizing of reference ground；By thermal fuse and the thermally conductive connection of varistor being independently arranged, when pressure-sensitive
Fever passes to thermal fuse when resistance failure, and thermal fuse is made to fuse, and circuit disconnects, and protects the first inductance L1, second
Each element in inductance L2 and post-filtering circuit；And when flowing through varistor voltage is more than that voltage is used continuously in maximum,
The thermal fuse of any overshoot voltage protective module is connected, when any protection pressure responsive resistor failure, thermal fuse
Timely feedback superheat state, disconnecting circuit, it is ensured that the normal work of other varistors mitigates the influence to filter circuit；It is logical
The working condition of overprotection indicating circuit monitoring varistor.
Protection indicating circuit is connected with the output end of overshoot voltage protective module, is sentenced in real time by light emitting diode D1
Effective working condition of disconnected varistor, zener diode D2 absorbs the excessively thermogenetic voltge surge of varistor, and passes through limit
Leakage resistance inhibits voltage peak, and the filter effect to post-filtering circuit is avoided to have an impact.
It is connected in series by concatenation thermal fuse with varistor, flowing through voltage in varistor is more than continuous use electricity
When pressure, the thermal fuse of series connection with it fuses in time, has reached the protective effect to other elements, and indicates corresponding mistake
Imitate the effect of varistor.
Post-filtering circuit is further protected by bi-directional voltage stabilizing diode after pressure responsive resistor failure.
Two-stage common-mode inductor and multiple capacitors are housed using post-filtering circuit, can supplement and inhibit prime filtering unit
The electromagnetic interference not filtered out, the performance of boostfiltering component.
The further advantage, target and feature of the utility model will be partially reflected by the following instructions, and part will also pass through
Research and practice to the utility model and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is embodiment protection type filter circuit schematic diagram；
Fig. 2 is the internal circuit schematic diagram of embodiment overshoot voltage protective module.
Specific embodiment
In order to make technological means of the utility model, creation characteristic, reach purpose and effect is more clear and is easy to
Understand, the utility model be further elaborated with reference to the accompanying drawings and detailed description:
As shown in Figure 1, protection type filter circuit, comprising the first inductance L1, the second inductance L2, post-filtering circuit and protection
Indicating circuit；The end positive input terminal P the first inductance L1 of protection type filter circuit is connected with the positive input terminal of post-filtering circuit；
The negative input end N-terminal of protection type filter circuit is connected through the second inductance L2 with the negative input end of post-filtering circuit；Protection type filter
The end positive input terminal P of wave circuit, negative input end N-terminal, protection type filter circuit reference ground be connected separately between any two
Voltage protection module is rushed, the overshoot voltage protective module includes varistor and the thermal fuse being independently arranged, wherein heat
Melting fuse and the thermally conductive connection of varistor；The thermal fuse of each overshoot voltage protective module is connected in series, whole one end
It is connected with post-filtering circuit positive input terminal, the other end is connected through protection indicating circuit with the negative input end of post-filtering circuit.
When it is implemented, three overshoot voltage protective modules have separately included the first varistor R1, the second varistor
R2 and third varistor R3；As shown in Fig. 2, the internal circuit schematic diagram of overshoot voltage protective module, pin 4 and pin 5
Between be independently equipped with and lead hot linked thermal fuse with each varistor, pin 1 passes through pin 3 with pin 2 and connect, and pin
It is in series between 2 and pin 3 and concatenates thermal fuse, current-limiting resistance R5 is connected between pin 1 and pin 3.First pressure
Pin 1, the pin 2 of quick resistance R1 is connected to the first inductance L1 input terminal and the second inductance L2 input terminal；First pressure
The pin 4 of quick resistance R1 is connect with the first inductance L1 voltage output end；The pin 5 of the first varistor R1 and second pressure-sensitive
The pin 4 of resistance R2 is connected；Pin 1, the pin 2 of the second varistor R2 be connected to the first inductance L1 input terminal and
Reference ground；The pin 5 of the second varistor R2 is connected with the pin 4 of third varistor R3；The pressure-sensitive electricity of third
Hinder the pin 1 of R3, pin 2 is connected with the second differential mode inductance L2 input and reference ground respectively；The third varistor R3's
Pin 5 is connected by the input terminal of protection indicating circuit with the input terminal of post-filtering circuit.
By the first varistor R1, the pin 4 of the second varistor R2 and third varistor R3, pin 5 as heat
Fuse monitoring client is connected to the right end of the first inductance L1, under normal circumstances, the input terminal input voltage of filter circuit, electric current
The first inductance L1 and the second inductance L2 are flowed through, when the input terminal of filter circuit removes power supply, since there are electric current reductions for circuit
Trend, the first inductance L1 and the second inductance L2 will generate Kickback voltage, so that certain voltge surge can be generated to back segment, protect
Indicating circuit is connected to the induction side of the first inductance L1, can share one part of current, alleviates to two pole of the first bi-directional voltage stabilizing
The rush of current of pipe D3.
The protection indicating circuit includes sequentially connected light emitting diode D1, zener diode D2 and current-limiting resistance R4；
The anode of the light emitting diode D1 is connected with the output end of overshoot voltage protective module；The cathode of the light emitting diode D1 with
The anode of zener diode D2 is connected；The cathode of the zener diode D2 is connected with current-limiting resistance R4 input terminal；The current limliting
Resistance R4 output end is connected with the negative input end of post-filtering circuit.Pass through light emitting diode, it can be determined that the work of varistor
Make state, and can also judge the working condition of the power supply of filter circuit, plays the role of preventing reverse power connection from entering circuit.
The overshoot voltage protective module also includes concatenation thermal fuse；The concatenation thermal fuse and varistor
It is connected in series.
The post-filtering circuit positive input terminal, negative input end and reference ground also respectively and are connected to first pair between any two
To zener diode D3, the second bi-directional voltage stabilizing diode D4, third bi-directional voltage stabilizing diode D5.
The post-filtering circuit includes common mode inductance L3, the first filter capacitor C1, the second filter capacitor C2, the first decoupling
Capacitor C3 and the second decoupling capacitance C4；The output end of the filter circuit is connect with common mode inductance L3；First filter capacitor
C1 is connected across common mode inductance L3 input terminal；The second filter capacitor C2 is connected across common mode inductance L3 output end；Described first moves back
It is whole in parallel with the output end of post-filtering circuit after coupling capacitor C3 and the second decoupling capacitance C4 connection, the first decoupling capacitance C3 with
The junction of second decoupling capacitance C4 is connected with reference ground.
The working principle of the utility model are as follows: when in use, by the end positive input terminal P of protection type filter circuit, negative input
The reference ground of N-terminal, protection type filter circuit is held to be connected separately with overshoot voltage protective module, either thunder and lightning between any two
Under the influence of influence or external circuit, so that the end positive input terminal P of protection type filter circuit, negative input end N-terminal are relative to reference
When the voltage of ground terminal increases suddenly or the end positive input terminal P, the voltage of negative input end N-terminal between the two increase suddenly, overshoot voltage
The resistance value of the varistor of protective module sharply becomes smaller, and forms access, while varistor and concatenation thermal fuse will be due to
The function of current generates heat, after exceeding normal calorific capacity, concatenates thermal fuse for Zapping circuit, avoids varistor in mistake
It is burnt out under Warm status；Conducting will be restored after temperature be in normal range (NR) by concatenating thermal fuse, again with the pressure-sensitive electricity that concatenates
Resistance common combination provides protection against filter circuit, and extends the service life of varistor；In addition, protection indicating circuit energy
It is enough that effective monitoring is carried out to the state of overshoot voltage protective module and the working condition of protection type filter circuit；Since protection indicates
Circuit is connect by leading hot linked thermal fuse with varistor in different overshoot voltage protective modules, once wherein heat
After fuse beyond temperature limiting due to disconnecting, protection indicating circuit will form open circuit, and light emitting diode D1 can not point
It is bright；With this, by the varistor monitored in three overshoot voltage protective modules simultaneously with the presence or absence of overheat harm；And due to protection
There are the one-way conductions elements such as light emitting diode D1, zener diode D2 in indicating circuit, when protection type filter circuit anode is defeated
When entering short of electricity or reversal connection, light emitting diode D1 will be unable to light, thus, it can be achieved that protection indicating circuit is to circuit working state
Indicate function.
Claims (5)
1. a kind of protection type filter circuit, which is characterized in that include the first inductance L1, the second inductance L2, post-filtering circuit with
Indicating circuit is protected, and is equipped with reference ground；The positive input terminal of protection type filter circuit is through the first inductance L1 and post-filtering electricity
The positive input terminal on road is connected；Negative input end of the negative input end of protection type filter circuit through the second inductance L2 and post-filtering circuit
It is connected；The positive input terminal of protection type filter circuit, negative input end, reference ground are connected separately with overshoot voltage protection between any two
Module, the overshoot voltage protective module include varistor and the thermal fuse that is independently arranged, wherein thermal fuse with
The thermally conductive connection of varistor；The thermal fuse of each overshoot voltage protective module is connected in series, whole one end and post-filtering
Circuit positive input terminal is connected, and the other end is connected through protection indicating circuit with the negative input end of post-filtering circuit.
2. a kind of protection type filter circuit according to claim 1, which is characterized in that the protection indicating circuit include according to
Light emitting diode D1, zener diode D2 and the current-limiting resistance R4 of secondary connection；The anode and overshoot electricity of the light emitting diode D1
The output end of protective module is pressed to be connected；The cathode of the light emitting diode D1 is connected with the anode of zener diode D2；It is described steady
The cathode of pressure diode D2 is connected with current-limiting resistance R4 input terminal；The current-limiting resistance R4 output end is negative with post-filtering circuit
Input terminal is connected.
3. a kind of protection type filter circuit according to claim 1, which is characterized in that the overshoot voltage protective module is also
Comprising concatenating thermal fuse；The concatenation thermal fuse is connected in series with varistor.
4. a kind of protection type filter circuit according to claim 1, which is characterized in that the post-filtering circuit positive input
End, negative input end and reference ground also respectively and are connected to bi-directional voltage stabilizing diode between any two.
5. a kind of protection type filter circuit according to claim 1, which is characterized in that the post-filtering circuit includes altogether
Mould inductance L3, the first filter capacitor C1, the second filter capacitor C2, the first decoupling capacitance C3 and the second decoupling capacitance C4；The filter
The output end of wave circuit is connect with common mode inductance L3；The first filter capacitor C1 is connected across common mode inductance L3 input terminal；It is described
Second filter capacitor C2 is connected across common mode inductance L3 output end；After the first decoupling capacitance C3 and the second decoupling capacitance C4 connection
It is whole in parallel with the output end of post-filtering circuit, the junction and reference ground of the first decoupling capacitance C3 and the second decoupling capacitance C4
End is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821930196.4U CN209057106U (en) | 2018-11-22 | 2018-11-22 | A kind of protection type filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821930196.4U CN209057106U (en) | 2018-11-22 | 2018-11-22 | A kind of protection type filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209057106U true CN209057106U (en) | 2019-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821930196.4U Expired - Fee Related CN209057106U (en) | 2018-11-22 | 2018-11-22 | A kind of protection type filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209057106U (en) |
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2018
- 2018-11-22 CN CN201821930196.4U patent/CN209057106U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190702 |