CN208862614U - A kind of high-voltage capacitance discharge protection circuit - Google Patents
A kind of high-voltage capacitance discharge protection circuit Download PDFInfo
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- CN208862614U CN208862614U CN201821765177.0U CN201821765177U CN208862614U CN 208862614 U CN208862614 U CN 208862614U CN 201821765177 U CN201821765177 U CN 201821765177U CN 208862614 U CN208862614 U CN 208862614U
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Abstract
The utility model relates to a kind of high-voltage capacitance discharge protection circuits; including rectifier bridge; the input terminal of the rectifier bridge is connected with capacitor to be discharged; output end is connected with N number of concatenated discharge resistance; at least one discharge resistance is provided with delay circuit in N number of concatenated discharge resistance; the delay circuit is in the discharge resistance short circuit that will be arranged with it after one section of discharge time, wherein N >=2.The resistance value that the utility model can gradually reduce discharge circuit with the variation of discharge time achievees the effect that quickly to discharge to capacitor.
Description
Technical field
The utility model relates to a kind of discharge protection circuits, more particularly to a kind of high-voltage capacitance discharge protection circuit.
Background technique
Since capacitor has a characteristic of storage electric energy, capacitor itself and to just having a charge and discharge process in system,
Capacitor discharge problem (although capacitor has discharge resistance) is more considered in maintenance actual mechanical process, if capacitor is being examined
Electric discharge is not thorough during repairing, and will cause personal injury.And common discharge protection circuit, preposition electric discharge probe distance are solid
It is fixed, it is unable to satisfy the electric discharge to different size capacitor, and need strictly corresponding to discharge circuit just in accordance with the positive and negative anodes of capacitor
Cathode goes to discharge, and otherwise discharge circuit can lead to circuit damage because reversed dash current is accessed.Common discharge circuit
Circuit resistance value be it is certain, can not change, when the rigid hand capacity of discharge circuit, capacitor release voltage and current it is all special
Greatly, the circuit of a high value is needed at this moment to bear high voltage, high current, but with the variation of time, the release of capacitor
Voltage and current can all reduce with the time, when current attenuation to a certain extent when, due to the high resistance of circuit, discharge time meeting
It is slower and slower.If electric discharge is not thorough, the remaining energy in capacitor can cause shock hazard to maintenance operator.
Utility model content
It, can be with putting the technical problem to be solved by the utility model is to provide a kind of high-voltage capacitance discharge protection circuit
The variation of electric time and the resistance value for gradually reducing discharge circuit achieve the effect that quickly to give capacitor electric discharge.
The technical scheme adopted by the utility model to solve the technical problem is as follows: providing a kind of high-voltage capacitance discharge prevention electricity
Road, including rectifier bridge, the input terminal of the rectifier bridge are connected with capacitor to be discharged, output end and N number of concatenated discharge resistance phase
Even, at least one discharge resistance is provided with delay circuit in N number of concatenated discharge resistance, and the delay circuit is passing through
The discharge resistance short circuit that will be arranged with it after one section of discharge time, wherein N >=2.
The delay circuit includes thyristor, and the cathode and anode of the thyristor are connected to corresponding discharge resistance
Both ends, control electrode is connected with the cathode of a diode, and the delay circuit further includes a resistance and a capacitor, described
One end of resistance is connected with the high-voltage end of rectification bridge output end, and the other end is connected with one end of the capacitor, the capacitor it is another
One end is connected with the low-pressure end of rectification bridge output end；The anode of the diode is also connected with the other end of the resistance.
The number of the delay circuit is N-1, respectively corresponds N-1 discharge resistance, wherein along discharge current direction
The last one discharge resistance be not provided with delay circuit.
The capacity of capacitor in delay circuit corresponding to the discharge resistance along discharge current direction is sequentially increased.
N number of concatenated discharge resistance both ends are also parallel with LED display lamp.
Beneficial effect
Due to the adoption of the above technical solution, the utility model compared with prior art, has the following advantages that and accumulates
Pole effect: the utility model has the characteristic of silicon rectification device using thyristor, can work under the conditions of high voltage, high current,
And the characteristic that its course of work can control makes by the conducting of thyristor come the resistance in timesharing gradually short circuit dischange circuit
Capacitance voltage is obtained under attenuation, discharge circuit can control the discharge current of capacitor, so that the discharge time of capacitor is aobvious
The shortening of work.In addition, the circuit of the utility model does not have to consider access sense of current, that is, positive and negative anodes, easy to use, this is practical
Novel circuit can also avoid the spark phenomenon that discharges caused by conventional discharge circuit.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The present invention will be further illustrated below in conjunction with specific embodiments.It should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model.In addition, it should also be understood that, in the content for having read the utility model instruction
Later, those skilled in the art can make various changes or modifications the utility model, and such equivalent forms equally fall within this Shen
It please the appended claims limited range.
The embodiments of the present invention is related to a kind of high-voltage capacitance discharge protection circuit, as shown in Figure 1, including rectification
Bridge, the input terminal of the rectifier bridge are connected with capacitor to be discharged, and output end is connected with four concatenated discharge resistances, and described four
Discharge resistance is provided with delay circuit in concatenated discharge resistance, the delay circuit is after one section of discharge time
The discharge resistance short circuit being arranged with it.
Illustrate that the construction of delay circuit, delay circuit include thyristor G1, the crystalline substance by taking discharge resistance R1 as an example below
The cathode and anode of brake tube G1 are connected to the both ends of discharge resistance R1, and control electrode is connected with the cathode of a diode D1,
The delay circuit further includes a resistance R and a capacitor C1, one end of the resistance R and the high-voltage end of rectification bridge output end
It is connected, the other end is connected with one end of the capacitor C1, the low-pressure end phase of the other end and rectification bridge output end of the capacitor C1
Even；The anode of the diode D1 is also connected with the other end of the resistance R.The both ends capacitor C1 are also parallel with a voltage-stabiliser tube
ZD1.The setting of the other three delay circuit with should delay circuit it is identical, be only connected in parallel on respectively discharge resistance R2 and electric discharge electricity
Hinder the both ends of R3.
In addition, four concatenated discharge resistance both ends are also parallel with LED display lamp, when there is electric current logical in discharge circuit
Out-of-date, LED display lamp can issue different degrees of brightness according to by the size of electric current.Pass through the bright of observation LED display lamp
Degree can also give the user judgment basis and intuitive phenomenon that judge one side of voltage swing of capacitor storage.
The working principle of present embodiment is as follows:
The high-voltage capacitance discharge protection circuit of present embodiment adjusts the electric current of different directions by a rectifier bridge, warp
After over commutation bridge, the electric current of the electric current meeting single direction of capacitor input, then, electric current can successively pass through delay circuit, electric discharge electricity
Resistance and LED display lamp；LED display lamp is bright, indicates electric current by this discharge circuit.And initial current passes through high-power resistance string
After the circuit branch being unified into, electric current has the amplitude significantly to decay, and current strength becomes smaller at this time, high-power resistance branch
Consumption electric energy effect can die down, and after circuit is connected, capacitor C1 is started to charge, when reaching setting voltage, first thyristor G1
Conducting, discharge resistance R1 are short-circuited, and the total resistance value of resistance branch reduces.The capacitance size of capacitor C1, C2 and C3 of delay circuit
Sequence is followed successively by C1 < C2 < C3, according to the charge-discharge characteristic of capacitor it can be concluded that time size needed for these three capacitor chargings
Sequence is followed successively by t1 < t2 < t3.By the conducting situation of first thyristor recited above, and as needed for three capacitor chargings
Time size can show that three thyristors can be sequentially turned on according to the time required to the charging of capacitor, and high-power resistance value is put
Resistance R1, R2 and R3 can be successively short-circuited, and next powerful discharge resistance R4 is only remained in last resistance branch.And capacitor
In electric energy after this period of time that circuitous resistance changes, electric energy has become very little, at this time discharge circuit resistance value pass through
A series of above-mentioned circuit variations, resistance value have also become smaller, and remaining electric energy can quickly be disappeared by discharge resistance R4 in capacitor
It consumes, when the electric current in discharge circuit becomes very little, thyristor G1, G2 and G3 can be turned off voluntarily, no longer to resistance in parallel
Play the role of short-circuit.So far, this discharge circuit completes repid discharge to capacitor.
It is not difficult to find that the utility model has the characteristic of silicon rectification device using thyristor, it can be in high voltage, high current item
It works under part, and the characteristic that its course of work can control, by the conducting of thyristor come in timesharing gradually short circuit dischange circuit
Resistance so that capacitance voltage, under attenuation, discharge circuit can control the discharge current of capacitor, so that capacitor is put
The electric time significantly shortens.In addition, the circuit of the utility model does not have to consider access sense of current, that is, positive and negative anodes, user
Just, the circuit of the utility model can also avoid the spark phenomenon that discharges caused by conventional discharge circuit.
Claims (5)
1. a kind of high-voltage capacitance discharge protection circuit, including rectifier bridge, the input terminal of the rectifier bridge are connected with capacitor to be discharged,
Output end is connected with N number of concatenated discharge resistance, which is characterized in that at least one in N number of concatenated discharge resistance is put
Resistance is provided with delay circuit, and the delay circuit is short by the discharge resistance being arranged with it after one section of discharge time
Road, wherein N >=2.
2. high-voltage capacitance discharge protection circuit according to claim 1, which is characterized in that the delay circuit includes brilliant lock
Pipe, the cathode and anode of the thyristor are connected to the both ends of corresponding discharge resistance, control electrode and diode
Cathode is connected, and the delay circuit further includes a resistance and a capacitor, one end of the resistance and rectification bridge output end
High-voltage end is connected, and the other end is connected with one end of the capacitor, the other end of the capacitor and the low-pressure end of rectification bridge output end
It is connected；The anode of the diode is also connected with the other end of the resistance.
3. high-voltage capacitance discharge protection circuit according to claim 1, which is characterized in that the number of the delay circuit is
N-1, respectively correspond N-1 discharge resistance, wherein the last one discharge resistance along discharge current direction is not provided with being delayed
Circuit.
4. high-voltage capacitance discharge protection circuit according to claim 3, which is characterized in that described along discharge current direction
Discharge resistance corresponding to the capacity of capacitor in delay circuit be sequentially increased.
5. high-voltage capacitance discharge protection circuit according to claim 1, which is characterized in that N number of concatenated electric discharge electricity
Resistance both ends are also parallel with LED display lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821765177.0U CN208862614U (en) | 2018-10-29 | 2018-10-29 | A kind of high-voltage capacitance discharge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821765177.0U CN208862614U (en) | 2018-10-29 | 2018-10-29 | A kind of high-voltage capacitance discharge protection circuit |
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| Publication Number | Publication Date |
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| CN208862614U true CN208862614U (en) | 2019-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821765177.0U Active CN208862614U (en) | 2018-10-29 | 2018-10-29 | A kind of high-voltage capacitance discharge protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110475405A (en) * | 2019-08-15 | 2019-11-19 | 吉安伊戈尔电气有限公司 | A kind of LED illumination DC power supply intelligent control module fast break circuit |
-
2018
- 2018-10-29 CN CN201821765177.0U patent/CN208862614U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110475405A (en) * | 2019-08-15 | 2019-11-19 | 吉安伊戈尔电气有限公司 | A kind of LED illumination DC power supply intelligent control module fast break circuit |
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