CN206977307U - It is a kind of to reduce because condenser failure causes the filter circuit of risk of explosion - Google Patents
It is a kind of to reduce because condenser failure causes the filter circuit of risk of explosion Download PDFInfo
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- CN206977307U CN206977307U CN201720945831.5U CN201720945831U CN206977307U CN 206977307 U CN206977307 U CN 206977307U CN 201720945831 U CN201720945831 U CN 201720945831U CN 206977307 U CN206977307 U CN 206977307U
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- electric capacity
- filter circuit
- inductance
- rectifier bridge
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Abstract
Reduced the utility model discloses a kind of because condenser failure causes the filter circuit of risk of explosion, the filter circuit includes electric capacity C1, electric capacity C3, inductance L1, wherein, electric capacity C1 both ends are connected to rectifier bridge BD1 positive-negative output end, inductance L1 one end connection rectifier bridge BD1 positive output end, the drain electrode of primary coil connection MOS switch pipe of the inductance L1 other ends through transformer T1, the drain electrode of MOS switch pipe connects rectifier bridge BD1 negative output terminal, electric capacity C3 is connected between the inductance L1 other ends and rectifier bridge BD1 negative output terminal, the filter circuit also includes electric capacity C4, the electric capacity C4 is in parallel with electric capacity C3.The utility model replaces main power supply capacitor by electric capacity C3, the C4 being connected in parallel, so that the entirely ineffective probability of main power supply capacitor substantially reduces, avoid MOS switch pipe and the risk of explosion of inductance, improve product reliability, it is almost nil in production test phase and user's service stage product blast probability after the filter circuit.
Description
Technical field
The utility model belongs to power filter technical field, and in particular to one kind is reduced because condenser failure causes the wind that explodes
The filter circuit of danger.
Background technology
At present, dc source is all obtained by AC power progress rectifying and wave-filtering mostly, turns direct current process in exchange
In, AC power must be direct current by rectifier bridge rectification, then be changed into smooth direct current by power supply capacitor.Rectifier bridge is usual
The bridge heap built for four diodes, effect are that alternating current is converted into direct current.Although rectifier bridge input has filtering device,
But in order to by conducting authentication test, deepen filtering depth, electric capacity-electricity can be increased between rectifier bridge and power transformer
Sense, one group of wave filter is formed with main power supply capacitor.In the case where main power supply capacitor is good, circuit can with normal work, once
Main power supply capacitor failure, MOS switch pipe drain-source voltage Vds is risen due to inductance inverse electromotive force voltage superposition, more than resistance to
Pressure value breakdown and explosion, inductance is as excessively stream is exploded.
Utility model content
The utility model technical issues that need to address are to provide a kind of reduce and caused quick-fried because main power supply capacitor fails
The filter circuit of fried risk, the filter circuit make blast probability almost nil.
To solve the above problems, technical solution adopted in the utility model is：
A kind of to reduce because condenser failure causes the filter circuit of risk of explosion, the filter circuit includes electric capacity C1, electric capacity
C3, inductance L1, wherein, electric capacity C1 both ends are connected to rectifier bridge BD1 positive-negative output end, inductance L1 one end connection rectifier bridge
BD1 positive output end, the drain electrode of primary coil connection MOS switch pipe of the inductance L1 other ends through transformer T1, MOS switch pipe
Drain electrode connects rectifier bridge BD1 negative output terminal, and electric capacity C3 is connected between the inductance L1 other ends and rectifier bridge BD1 negative output terminal,
It is in parallel with electric capacity C3 that the filter circuit also includes electric capacity C4, the electric capacity C4.
Further, described electric capacity C3, C4 capacitance sum are the capacitance of the filter circuit normal work.
Further, the ratio between described electric capacity C3, C4 capacitance is 1:1.
It is using beneficial effect caused by above-mentioned technical proposal：
The utility model replaces main power supply capacitor by electric capacity C3, the C4 being connected in parallel, so that main power supply capacitor is complete
Fail-all probability substantially reduces, and avoids MOS switch pipe and the risk of explosion of inductance, improves product reliability, application
It is almost nil in production test phase and user's service stage product blast probability after the filter circuit.
Brief description of the drawings
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Utility model is described in further detail below in conjunction with the accompanying drawings：
As shown in figure 1, the utility model filter circuit includes electric capacity C1, electric capacity C3, inductance L1, wherein, the two of electric capacity C1
End is connected to rectifier bridge BD1 positive-negative output end, inductance L1 one end connection rectifier bridge BD1 positive output end, the inductance L1 other ends
The drain electrode of primary coil connection MOS switch pipe through transformer T1, the drain electrode of MOS switch pipe connect rectifier bridge BD1 negative output terminal,
Electric capacity C3 is connected between the inductance L1 other ends and rectifier bridge BD1 negative output terminal, and the filter circuit is described also including electric capacity C4
Electric capacity C4 is in parallel with electric capacity C3.
The utility model is to substitute the main power supply capacitor in former filter circuit with electric capacity C3, the C4 being connected in parallel, therefore,
To ensure circuit normal work, described electric capacity C3, C4 capacitance sum are the capacitance of the filter circuit normal work.Together
When, during in order to ensure any of electric capacity C3, C4 condenser failure, circuit cisco unity malfunction, will not also cause MOS open the light pipe and
Inductance L1 explodes, by the control of the ratio between described electric capacity C3, C4 capacitance in a certain ratio range, the optimum ratio of its capacitance
For 1:1.
Operation principle：
As shown in figure 1, during normal work, the voltage Vc3=Vc1 ≈ Vin*1.414 at figure interior joint Vc3, MOS switch pipe
The voltage Vds=Vc3+Vz=Vin*1.414+Vz, Vz that hourglass source electrode is born during shut-off are transformer T1 primary coil both end voltages.
Conventional design under normal circumstances is that electric capacity C3, C4 position are a main power supply capacitors (being named as C2), rather than the design
Two and column capacitance, once main power supply capacitor C2 fails, inductance L1 both ends can have inverse electromotive force Vl1, now, Vc1 ≈
Vin*1.414, Vc3=Vc1+Vl1=Vin*1.414+Vl1, the voltage Vds=Vc3 that hourglass source electrode is born when MOS switch pipe turns off
+ Vz=Vin*1.414+Vz+Vl1, Vds voltage can exceed the hourglass source electrode rated voltage of MOS switch pipe, and MOS switch pipe overvoltage is hit
Drilling and blasting is fried, and inductance L1 can also explode because of excessively stream.
After improved, π filter elements of the present utility model use C1-L1-C3C4 design, electric capacity C3+C4 capacitance
Meet that normally band carries, if electric capacity C3 or C4 fail, electric capacity C4 or C3 realize normal energy storage effect, now Vds=Vc3
+ Vz=Vin*1.414+Vz or Vds=Vc4+Vz=Vin*1.414+Vz, extra inverse electromotive force Vl1 superpositions are not had
Voltage, but electric capacity C4 or C3 now normally band can not be carried, and power-fail, Vds voltages maintain Vc3+Vz constant, will not hit
Wear, whole power supply does not have risk of explosion.
Claims (3)
1. a kind of reduce causes the filter circuit of risk of explosion due to condenser failure, the filter circuit include electric capacity C1, electric capacity C3,
Inductance L1, wherein, electric capacity C1 both ends are connected to rectifier bridge BD1 positive-negative output end, inductance L1 one end connection rectifier bridge BD1's
Positive output end, the drain electrode of primary coil connection MOS switch pipe of the inductance L1 other ends through transformer T1, the drain electrode of MOS switch pipe
Rectifier bridge BD1 negative output terminal is connect, electric capacity C3 is connected between the inductance L1 other ends and rectifier bridge BD1 negative output terminal, and it is special
Sign is：It is in parallel with electric capacity C3 that the filter circuit also includes electric capacity C4, the electric capacity C4.
2. because condenser failure causes the filter circuit of risk of explosion, its feature exists for a kind of reduction according to claim 1
In the capacitance that described electric capacity C3, C4 capacitance sum are the filter circuit normal work.
3. because condenser failure causes the filter circuit of risk of explosion, its feature exists for a kind of reduction according to claim 2
In the ratio between described electric capacity C3, C4 capacitance be 1:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720945831.5U CN206977307U (en) | 2017-07-31 | 2017-07-31 | It is a kind of to reduce because condenser failure causes the filter circuit of risk of explosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720945831.5U CN206977307U (en) | 2017-07-31 | 2017-07-31 | It is a kind of to reduce because condenser failure causes the filter circuit of risk of explosion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206977307U true CN206977307U (en) | 2018-02-06 |
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ID=61398194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720945831.5U Active CN206977307U (en) | 2017-07-31 | 2017-07-31 | It is a kind of to reduce because condenser failure causes the filter circuit of risk of explosion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206977307U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109029165A (en) * | 2018-09-04 | 2018-12-18 | 江苏众芯邦软件科技有限公司 | A kind of the detonator circuit and test method of electronic delay control |
-
2017
- 2017-07-31 CN CN201720945831.5U patent/CN206977307U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109029165A (en) * | 2018-09-04 | 2018-12-18 | 江苏众芯邦软件科技有限公司 | A kind of the detonator circuit and test method of electronic delay control |
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