CN104143819A - Filter capacitor bleeder circuit - Google Patents
Filter capacitor bleeder circuit Download PDFInfo
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- CN104143819A CN104143819A CN201310164739.1A CN201310164739A CN104143819A CN 104143819 A CN104143819 A CN 104143819A CN 201310164739 A CN201310164739 A CN 201310164739A CN 104143819 A CN104143819 A CN 104143819A
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- pin
- filter capacitor
- leadage circuit
- resistance
- chips
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Abstract
The embodiment of the invention provides a filter capacitor bleeder circuit. The filter capacitor bleeder circuit comprises a control circuit and a bleeder circuit body, wherein the control circuit is used for controlling the on-off state of the bleeder circuit body; the bleeder circuit body is used for releasing charges accumulated on a filter capacitor. By the adoption of the filter capacitor bleeder circuit, the charges accumulated on the filter capacitor can be quickly released after an external DC power supply is powered off, so that the safety of maintenance staff and a whole machine circuit is protected.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to a kind of filter capacitor leadage circuit.
Background technology
Filter capacitor is a kind of energy storage device that is used for reducing alternation pulse ripple coefficient, and nearly all alternating current need to being converted in galvanic circuit all can arrange a filter capacitor at power output end, to obtain level and smooth direct current output.Conventionally, the capacitance of filter capacitor is very large, in short time after down circuitry, on filter capacitor, can accumulate a large amount of electric charges, if this circuit is not the filter capacitor design approach of releasing, the maintenance personal who does not understand this circuit structure may get an electric shock because touching filter capacitor, and the high voltage at filter capacitor two ends also exists potential safety hazard to circuitry.
Summary of the invention
Technical problem to be solved by this invention is, a kind of filter capacitor leadage circuit is provided.Externally after DC power supply power-off, the electric charge accumulating on the filter capacitor of releasing rapidly, the safety of protection maintenance personal and circuitry.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of filter capacitor leadage circuit, comprises control circuit and leadage circuit, wherein:
Described control circuit is for controlling the on off state of described leadage circuit;
The electric charge of described leadage circuit for accumulating on the filter capacitor of releasing.
In some feasible execution modes, described control circuit comprises 555 chips, switch, the first electric capacity, the second electric capacity and the second resistance, wherein:
The first pin of described 555 chips and the 5th pin ground connection, the second pin connect with described switch after ground connection, the 3rd pin connects described leadage circuit, the 4th pin is connected with the 8th pin, ground connection after its common node and described the first capacitances in series, the 6th pin is connected with the 7th pin, and its common node connects external dc power by described the second resistance;
The 6th pin of 555 chips and the common node of the 7th pin described in one termination of described the second electric capacity, other end ground connection;
Described the second resistance is connected with the common node of the 8th pin with the common node of described external dc power and the 4th pin of described 555 chips.
In some feasible execution modes, described leadage circuit comprises the 3rd resistance, metal-oxide-semiconductor and filter capacitor, wherein:
External dc power described in one termination of described the 3rd resistance, the drain electrode of metal-oxide-semiconductor described in another termination;
The grid of described metal-oxide-semiconductor connects the 3rd pin of described 555 chips, source ground;
External dc power described in one termination of described filter capacitor, other end ground connection.
In some feasible execution modes, between described the second resistance and described external dc power, be connected to the first resistance.
In some feasible execution modes, described the first electric capacity two ends are parallel with voltage stabilizing didoe.
In some feasible execution modes, between the 5th pin of described 555 chips and the 5th pin and the common node of the first pin, be connected to the 3rd electric capacity;
In some feasible execution modes, described metal-oxide-semiconductor is N channel enhancement metal-oxide-semiconductor.
Implement the embodiment of the present invention, tool has the following advantages or beneficial effect:
The filter capacitor leadage circuit of the embodiment of the present invention comprises control circuit and leadage circuit, and wherein, described control circuit comprises 555 chips, switch, the first electric capacity, the second electric capacity and the second resistance; Described leadage circuit comprises the 3rd resistance, metal-oxide-semiconductor and filter capacitor.When external dc power power-off, press described switch and can trigger described 555 chips, make described 555 chips in temporary stable state, the 3rd pin output high level, further cause described metal-oxide-semiconductor conducting, now described filter capacitor can discharge by described the 3rd resistance and described metal-oxide-semiconductor, and the charge discharging resisting of accumulation is gone out.When external dc power normal power supply, described 555 chips are in reset mode, and the 3rd pin output low level, makes the not conducting of described metal-oxide-semiconductor, and now described leadage circuit is not worked, and does not affect the normal operation of circuitry.
As can be seen here, adopt the present invention, externally after DC power supply power-off, the electric charge accumulating on the filter capacitor of releasing rapidly, the safety of protection maintenance personal and circuitry.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that the structure of an embodiment of filter capacitor leadage circuit of the present invention forms schematic diagram.
Fig. 2 is the circuit catenation principle figure of an embodiment of filter capacitor leadage circuit of the present invention.
Fig. 3 is the circuit catenation principle figure of another embodiment of filter capacitor leadage circuit of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 1, for the structure of an embodiment of filter capacitor leadage circuit of the present invention forms schematic diagram.As shown in Figure 1, filter capacitor leadage circuit of the present invention comprises control circuit 1 and leadage circuit 2, and wherein, control circuit 1 is for controlling the on off state of described leadage circuit 2; The electric charge of leadage circuit 2 for accumulating on the filter capacitor of releasing.
Please refer to Fig. 2, is the circuit catenation principle figure of an embodiment of filter capacitor leadage circuit of the present invention.As shown in Figure 2, control circuit 1 comprises 555 chips, switch S 1, the first capacitor C 1, the second capacitor C 2 and the second resistance R 2, wherein: the first pin of 555 chips and the 5th pin ground connection, the second pin connect with switch S 1 after ground connection, the 3rd pin connects leadage circuit 2, the four pins and is connected with the 8th pin, its common node connect with the first capacitor C 1 after ground connection, the 6th pin is connected with the 7th pin, and its common node meets external dc power VCC by the second resistance R 2; The 6th pin of one termination 555 chips of the second capacitor C 2 and the common node of the 7th pin, other end ground connection; The second resistance R 2 is connected with the common node of the 8th pin with the common node of external dc power VCC and the 4th pin of 555 chips.Particularly, the first pin of 555 chips, the second pin, the 3rd pin, the 4th pin, the 5th pin, the 6th pin, the 7th pin and the 8th pin are respectively pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7, the pin 8 of 555 chips.Leadage circuit 2 comprises the 3rd resistance R 3, metal-oxide-semiconductor Q1 and filter capacitor C4, wherein: a termination external dc power VCC of the 3rd resistance R 3, the drain electrode of another termination metal-oxide-semiconductor Q1; The grid of metal-oxide-semiconductor Q1 connects the pin 3 of 555 chips, source ground; A termination external dc power VCC of filter capacitor C4, other end ground connection.
In specific implementation, metal-oxide-semiconductor Q1 is N channel enhancement metal-oxide-semiconductor.In order to bear the large electric current from filter capacitor C4, the 3rd resistance R 3 should be selected high-power resistance, and metal-oxide-semiconductor Q1 should select the maximum can the larger metal-oxide-semiconductor of withstand current.
Please further refer to Fig. 3, be the circuit catenation principle figure of an embodiment of filter capacitor leadage circuit of the present invention.As shown in Figure 3, in some feasible execution modes, on the basis of the circuit of Fig. 2, also can comprise one or more in following circuit structure.
1, between described the second resistance R 2 and described external dc power VCC, be connected to the first resistance R 1.The first resistance R 1, for dividing potential drop, makes 555 chip operations under suitable voltage.
2, described the first capacitor C 1 two ends are parallel with voltage stabilizing didoe D1; Voltage stabilizing didoe D1, for controlling the voltage of the first electric capacity two C1 ends, is operated under suitable voltage the pin 4 of 555 chips and pin 8.
3, between the pin 5 of described 555 chips and pin 5 and the common node of pin 1, be connected to the 3rd capacitor C 3; The 3rd capacitor C 3 is filter capacitors, for preventing that 555 chips are subject to noise jamming.
In specific implementation, the operation principle of the circuit of the embodiment of the present invention is roughly as follows:
When external dc power VCC power-off, press switch S 1 and can trigger described 555 chips, make 555 chips in temporary stable state, the pin 3 output high level of 555 chips, further cause metal-oxide-semiconductor Q1 conducting, now filter capacitor C4 can discharge by the 3rd resistance R 3 and metal-oxide-semiconductor Q1, and the charge discharging resisting of accumulation is gone out.
When external dc power VCC normal power supply, 555 chips are in reset mode, and pin 3 output low levels, make not conducting of metal-oxide-semiconductor Q1, and now leadage circuit 2 is not worked, and does not affect the normal operation of circuitry.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The modification of doing within any spirit at above-mentioned execution mode and principle, be equal to and replace and improvement etc., within all should being included in the protection range of this technical scheme.
Claims (7)
1. a filter capacitor leadage circuit, is characterized in that, comprises control circuit and leadage circuit, wherein:
Described control circuit is for controlling the on off state of described leadage circuit;
The electric charge of described leadage circuit for accumulating on the filter capacitor of releasing.
2. filter capacitor leadage circuit as claimed in claim 1, is characterized in that, described control circuit comprises 555 chips, switch, the first electric capacity, the second electric capacity and the second resistance, wherein:
The first pin of described 555 chips and the 5th pin ground connection, the second pin connect with described switch after ground connection, the 3rd pin connects described leadage circuit, the 4th pin is connected with the 8th pin, ground connection after its common node and described the first capacitances in series, the 6th pin is connected with the 7th pin, and its common node connects external dc power by described the second resistance;
The 6th pin of 555 chips and the common node of the 7th pin described in one termination of described the second electric capacity, other end ground connection;
Described the second resistance is connected with the common node of the 8th pin with the common node of described external dc power and the 4th pin of described 555 chips.
3. filter capacitor leadage circuit as claimed in claim 1, is characterized in that, described leadage circuit comprises the 3rd resistance, metal-oxide-semiconductor and filter capacitor, wherein:
External dc power described in one termination of described the 3rd resistance, the drain electrode of metal-oxide-semiconductor described in another termination;
The grid of described metal-oxide-semiconductor connects the 3rd pin of described 555 chips, source ground;
External dc power described in one termination of described filter capacitor, other end ground connection.
4. filter capacitor leadage circuit as claimed in claim 1, is characterized in that, between described the second resistance and described external dc power, is connected to the first resistance.
5. filter capacitor leadage circuit as claimed in claim 1, is characterized in that, described the first electric capacity two ends are parallel with voltage stabilizing didoe.
6. filter capacitor leadage circuit as claimed in claim 1, is characterized in that, between the 5th pin of described 555 chips and the 5th pin and the common node of the first pin, is connected to the 3rd electric capacity.
7. the filter capacitor leadage circuit as described in claim 1-6, is characterized in that, described metal-oxide-semiconductor is N channel enhancement metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310164739.1A CN104143819A (en) | 2013-05-07 | 2013-05-07 | Filter capacitor bleeder circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310164739.1A CN104143819A (en) | 2013-05-07 | 2013-05-07 | Filter capacitor bleeder circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104143819A true CN104143819A (en) | 2014-11-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310164739.1A Pending CN104143819A (en) | 2013-05-07 | 2013-05-07 | Filter capacitor bleeder circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN104143819A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967305A (en) * | 2015-06-05 | 2015-10-07 | 惠而浦（中国）股份有限公司 | Automatic power-off discharge control circuit and automatic discharge method |
| CN107979272A (en) * | 2017-12-18 | 2018-05-01 | 联想(北京)有限公司 | Circuit for module power supply |
| CN108075631A (en) * | 2016-11-15 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Household electrical appliance and its pressure relief device |
| CN111555597A (en) * | 2020-03-31 | 2020-08-18 | 芜湖宏景电子股份有限公司 | Residual current discharge circuit of DDR chip power supply circuit |
-
2013
- 2013-05-07 CN CN201310164739.1A patent/CN104143819A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967305A (en) * | 2015-06-05 | 2015-10-07 | 惠而浦（中国）股份有限公司 | Automatic power-off discharge control circuit and automatic discharge method |
| CN108075631A (en) * | 2016-11-15 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Household electrical appliance and its pressure relief device |
| CN107979272A (en) * | 2017-12-18 | 2018-05-01 | 联想(北京)有限公司 | Circuit for module power supply |
| CN111555597A (en) * | 2020-03-31 | 2020-08-18 | 芜湖宏景电子股份有限公司 | Residual current discharge circuit of DDR chip power supply circuit |
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Application publication date: 20141112 |
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| RJ01 | Rejection of invention patent application after publication |