CN202059320U - Direct current high voltage supply current sampling circuit and direct current high voltage supply - Google Patents
Direct current high voltage supply current sampling circuit and direct current high voltage supply Download PDFInfo
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- CN202059320U CN202059320U CN2011200206241U CN201120020624U CN202059320U CN 202059320 U CN202059320 U CN 202059320U CN 2011200206241 U CN2011200206241 U CN 2011200206241U CN 201120020624 U CN201120020624 U CN 201120020624U CN 202059320 U CN202059320 U CN 202059320U
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Abstract
The utility model discloses a direct current high voltage supply current sampling circuit and a direct current high voltage supply. The sampling circuit comprises a second resistance, a first diode, a first resistance and a first capacitance which are in parallel connection; a first terminal of the second resistance is in connection with an anode of the first diode; a second terminal of the second resistance is in connection with a first common point of the first resistance and the first capacitance; the first diode is a bidirectional TVS (Transient Voltage Suppressors) tube; a cathode of the first diode is in connection with a second common point of the first resistance and the first capacitance; and the second common point is earthing. The direct current high voltage supply current sampling circuit of the utility model is provided with a protective TVS tube and a divider resistance such that when the high voltage supply arcs or is short-circuited, the voltage can be performed clamping and partial pressure so as to prevent the sampling circuit and a rear end circuit from the damage caused by the impact of the high voltage when the high voltage supply arcs or is short-circuited and to raise reliability.
Description
Technical field
The utility model relates to electronic applications, relates in particular to a kind of DC high-voltage power supply current sampling circuit and DC high-voltage power supply.
Background technology
At present, the constant flow high pressure power supply is used in the air cleaning facility, can make the efficient of air cleaning facility keep constant, but because the key technology current sampling circuit reliability of constant flow high pressure power supply is lower, so the high voltage source that most of air cleaning is used also all is an Open architecture, does not possess the constant current function.Generally adopting in existing DC high-voltage power supply is connected in parallel by resistance and electric capacity forms current sampling circuit, current sampling circuit connects rectification circuit and reverse amplification circuit, when high voltage source generation arcing or short circuit, the obstructed overload of high pressure, the pressure drop of whole high pressure all is added in the sampling resistor two ends, though the high voltage source load capacity of general air cleaner is not very big, voltage can sharply descend after the short circuit, but the electric energy of capacitance stores is still very big in the impact of abrupt release in the rectification circuit, can cause two kinds of infringements like this, the one, sampling resistor overpower and burning out, the 2nd, back-end circuit is impacted and is damaged owing to overvoltage.
The utility model content
The technical problem that the utility model mainly solves provides a kind of when high voltage source generation arcing or short circuit, non-damageable DC high-voltage power supply current sampling circuit of circuit and DC high-voltage power supply.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of DC high-voltage power supply current sampling circuit is provided, connect high-voltage rectifier and reverse amplification circuit respectively, described DC high-voltage power supply sample circuit comprises first resistance, first electric capacity that is connected in parallel, it is characterized in that, also comprise: second resistance and first diode, the first terminal of described second resistance connects the positive pole of described first diode, and described second resistance is connected high-voltage rectifier with the common junction of described first diode; Second terminal of described second resistance is connected to first common junction of described first resistance and described first electric capacity, and described first common junction connects reverse amplification circuit; Described first diode is two-way TVS pipe, and the negative pole of described first diode is connected to second common junction of described first resistance and described first electric capacity, and the described second common junction ground connection.
Wherein, described high-voltage rectifier comprises transformer, second diode, the 3rd diode, the 4th diode, the 5th diode, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, and second output of described transformer connects described DC high-voltage power supply current sampling circuit; First output of described transformer connects an end of second electric capacity, the positive pole of described second diode of the second output termination of described transformer, the other end of described second electric capacity is connected with the negative pole of described second diode, described second electric capacity also is connected the first terminal of described the 3rd electric capacity and the positive pole of described the 3rd diode with the common junction of described second diode, the negative pole of described the 3rd diode connects the positive pole of described the 4th diode, the negative pole of described the 4th diode connects second terminal of described the 3rd electric capacity, and described the 4th diode and the common junction of described the 3rd electric capacity also are connected the positive pole of described the 5th diode; Second output of described transformer also connects the first terminal of described the 4th electric capacity, second terminal of described the 4th electric capacity connects the common junction of described the 3rd diode and described the 4th diode, and connect the first terminal of described the 5th electric capacity, second terminal of described the 5th electric capacity is connected with the negative pole of described the 5th diode, and the output that this common junction forms high-voltage DC power supply links to each other with load.
Wherein, described reverse amplification circuit comprises: the 3rd resistance, the 4th resistance, the 5th resistance and first integrated circuit, one end of described the 3rd resistance connects described DC high-voltage power supply current sampling circuit, the other end is connected to second pin of described first integrated circuit, also be connected to first pin of described first integrated circuit by described the 4th resistance, the 3rd pin of described first integrated circuit is by described the 5th grounding through resistance, the 4th pin ground connection of described first integrated circuit.
For solving the problems of the technologies described above, another technical scheme that the utility model adopts is: a kind of DC high-voltage power supply, comprise the DC high-voltage power supply current sampling circuit, high-voltage rectifier and reverse amplification circuit, described DC high-voltage power supply current sampling circuit connects described high-voltage rectifier and described reverse amplification circuit respectively, it is characterized in that: described DC high-voltage power supply current sampling circuit comprises second resistance, first diode, first resistance that is connected in parallel and first electric capacity, the first terminal of described second resistance connects the positive pole of described first diode, and described second resistance is connected high-voltage rectifier with the common junction of described first diode; Second terminal of described second resistance is connected to first common junction of described first resistance and described first electric capacity, and described first common junction connects reverse amplification circuit; Described first diode is two-way TVS pipe, and the negative pole of described first diode is connected to second common junction of described first resistance and described first electric capacity, and the described second common junction ground connection.
Wherein, described high-voltage rectifier comprises transformer, second diode, the 3rd diode, the 4th diode, the 5th diode, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, and second output of described transformer connects described DC high-voltage power supply current sampling circuit; First output of described transformer connects an end of second electric capacity, the positive pole of described second diode of the second output termination of described transformer, the other end of described second electric capacity is connected with the negative pole of described second diode, described second electric capacity also is connected the first terminal of described the 3rd electric capacity and the positive pole of described the 3rd diode with the common junction of described second diode, the negative pole of described the 3rd diode connects the positive pole of described the 4th diode, the negative pole of described the 4th diode connects second terminal of described the 3rd electric capacity, and described the 4th diode and the common junction of described the 3rd electric capacity also are connected the positive pole of described the 5th diode; Second output of described transformer also connects the first terminal of described the 4th electric capacity, second terminal of described the 4th electric capacity connects the common junction of described the 3rd diode and described the 4th diode, and connect the first terminal of described the 5th electric capacity, second terminal of described the 5th electric capacity is connected with the negative pole of described the 5th diode, and the output that this common junction forms high-voltage DC power supply links to each other with load.
Wherein, described reverse amplification circuit comprises: the 3rd resistance, the 4th resistance, the 5th resistance and first integrated circuit, one end of described the 3rd resistance connects described DC high-voltage power supply current sampling circuit, the other end is connected to second pin of described first integrated circuit, also be connected to first pin of described first integrated circuit by described the 4th resistance, the 3rd pin of described first integrated circuit is by described the 5th grounding through resistance, the 4th pin ground connection of described first integrated circuit.
The beneficial effects of the utility model are: the current sampling circuit that is different from the prior art employing only is a sampling resistor and a filter capacitor; TVS pipe and a divider resistance of a protection usefulness now on circuit, have been increased; when high voltage source arcing or short circuit, can carry out clamper and dividing potential drop to voltage; prevent when high voltage source arcing or short circuit; impacting with high pressure improves reliability to the damage of sample circuit and back-end circuit.
Description of drawings
Fig. 1 is the circuit structure diagram of the utility model DC high-voltage power supply current sampling circuit;
Fig. 2 is the circuit structure diagram of the utility model DC high-voltage power supply.
Embodiment
By describing technology contents of the present utility model, structural feature in detail, realized purpose and effect, give explanation below in conjunction with execution mode and conjunction with figs. are detailed.
See also Fig. 1, the utility model provides a kind of DC high-voltage power supply current sampling circuit, connect high-voltage rectifier and reverse amplification circuit respectively, described DC high-voltage power supply sample circuit comprises first resistance R 1, first capacitor C 1 that is connected in parallel, also comprise second resistance R 2 and the first diode D1, the first terminal of described second resistance R 2 connects the positive pole of the described first diode D1, and described second resistance R 2 is connected high-voltage rectifier with the common junction C of the described first diode D1; Second terminal of described second resistance R 2 is connected to the first common junction B of described first resistance R 1 and described first capacitor C 1, and the described first common junction B connects reverse amplification circuit; The described first diode D1 is two-way TVS pipe, and the negative pole of the described first diode D1 is connected to second common junction of described first resistance R 1 and described first capacitor C 1, and the described second common junction ground connection.
Compare with the DC high-voltage power supply current sampling circuit of prior art; the utility model has increased a two-way TVS pipe of over-voltage protector at the sampling resistor two ends; once arcing or short circuit take place; when the surge voltage on the sampling resistor has surpassed the protection voltage of TVS pipe; TVS manages action, clamps the voltage in the protection voltage range of TVS pipe.Secondly; sampling resistor is divided into two; adopt the mode of series connection dividing potential drop; and in minute pressure side parallel connection a filter capacitor; because when high voltage source generation arcing or short circuit, though the protection of TVS pipe wrench position is arranged, any protection device all has response time delay; form a RC filter circuit by series resistance and filter capacitor, this circuit can make the circuit of the preceding protection of TVS pipe action back.By on available circuit, increasing TVS pipe and a divider resistance of a protection usefulness; when high voltage source arcing or short circuit, can carry out clamper and dividing potential drop to voltage; prevent that when high voltage source arcing or short circuit impacting with high pressure improves reliability to the damage of sample circuit and back-end circuit.
See also Fig. 2, the utility model DC high-voltage power supply current sampling circuit 10 connects a high-voltage rectifier 20, described high-voltage rectifier 20 comprises transformer T1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, and second output of described transformer T1 connects the contact C of described DC high-voltage power supply current sampling circuit 10;
First output of described transformer T1 connects an end of second capacitor C 2, the positive pole of the described second diode D2 of the second output termination of described transformer T1, the other end of described second capacitor C 2 is connected with the negative pole of the described second diode D2, described second capacitor C 2 also is connected the first terminal of described the 3rd capacitor C 3 and the positive pole of described the 3rd diode D3 with the common junction of the described second diode D2, the negative pole of described the 3rd diode D3 connects the positive pole of described the 4th diode D4, the negative pole of described the 4th diode D4 connects second terminal of described the 3rd capacitor C 3, and described the 4th diode D4 and the common junction of described the 3rd capacitor C 3 also are connected the positive pole of described the 5th diode D5;
Second output of described transformer T1 also connects the first terminal of described the 4th capacitor C 4, second terminal of described the 4th capacitor C 4 connects the common junction of described the 3rd diode D3 and described the 4th diode D4, and connect the first terminal of described the 5th capacitor C 5, second terminal of described the 5th capacitor C 5 is connected with the negative pole of described the 5th diode D5, and the output HV1 that this common junction forms high-voltage DC power supply links to each other with load.
Consult Fig. 2 equally, the utility model DC high-voltage power supply current sampling circuit 10 connects a reverse amplification circuit 30, described reverse amplification circuit 30 comprises: the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5 and first integrated circuit (IC) 1, one end of described the 3rd resistance R 3 connects the contact B of DC high-voltage power supply current sampling circuit 10, the other end is connected to second pin of described first integrated circuit (IC) 1, also be connected to first pin of described first integrated circuit (IC) 1 by described the 4th resistance R 4, the 3rd pin of described first integrated circuit (IC) 1 is by described the 5th resistance R 5 ground connection, the 4th pin ground connection of described first integrated circuit (IC) 1.
Fig. 2 is the circuit diagram of DC high-voltage power supply of the present utility model, comprise DC high-voltage power supply current sampling circuit 10, high-voltage rectifier 20, reverse amplification circuit 30, wherein the DC high-voltage power supply current sampling circuit 10, comprise second resistance R 2, the first diode D1, first resistance R 1, first capacitor C 1 that are connected in parallel, the first terminal of described second resistance R 2 connects the positive pole of the described first diode D1, and described second resistance R 2 is connected high-voltage rectifier with the common junction C of the described first diode D1; Second terminal of described second resistance R 2 is connected to the first common junction B of described first resistance R 1 and described first capacitor C 1, and the described first common junction B connects reverse amplification circuit; The described first diode D1 is two-way TVS pipe, and the negative pole of the described first diode D1 is connected to second common junction of described first resistance R 1 and described first capacitor C 1, and the described second common junction ground connection.
Electric current is held by load from HV1 during the DC high-voltage power supply operate as normal, flow to GND, and then from GND by sampling resistor R1, resistance R 2, flow back to high-tension transformer T1 again, just GND has been produced a negative voltage through the electric current of R1 like this, this voltage of bearing becomes the voltage after the positive amplification after by reverse amplification circuit, uses for back-end circuit, at this moment the pressure drop of whole high pressure mainly is created in the load, and sampling resistor R1, R2 only bear a very little voltage.When arcing or short circuit take place when; high pressure is not by load; HV1 and GND direct short-circuit; at this moment the pressure drop of whole high pressure all adds on sampling resistor R1, the R2, and when voltage surpassed the puncture voltage of TVS pipe, the electric current major part flow through from the TVS pipe; make the last voltage clamp of sampling resistor R1, R2 about certain numerical value; because the dividing potential drop of resistance R 2 further reduces voltage, has protected back-end circuit.Because the RC filter circuit that resistance R 1 and capacitor C 1 are formed has bigger time constant, when the high pressure in TVS pipe action deferring procedure produced and impacts, electric current charged to C1 by R1, prevents voltage jump, the same effect of playing the protection back-end circuit again.
The internal current sample circuit of the utility model DC high-voltage power supply; TVS pipe and a divider resistance of a protection usefulness have been increased; when high voltage source arcing or short circuit, can carry out clamper and dividing potential drop to voltage; prevent when high voltage source arcing or short circuit; impacting with high pressure improves the reliability of power supply to the damage of sample circuit and back-end circuit.
The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (6)
1. DC high-voltage power supply current sampling circuit, connect high-voltage rectifier and reverse amplification circuit respectively, described DC high-voltage power supply sample circuit comprises first resistance, first electric capacity that is connected in parallel, it is characterized in that, also comprise: second resistance and first diode, the first terminal of described second resistance connects the positive pole of described first diode, and described second resistance is connected high-voltage rectifier with the common junction of described first diode; Second terminal of described second resistance is connected to first common junction of described first resistance and described first electric capacity, and described first common junction connects reverse amplification circuit; Described first diode is two-way TVS pipe, and the negative pole of described first diode is connected to second common junction of described first resistance and described first electric capacity, and the described second common junction ground connection.
2. DC high-voltage power supply current sampling circuit according to claim 1, it is characterized in that: described high-voltage rectifier comprises transformer, second diode, the 3rd diode, the 4th diode, the 5th diode, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, and second output of described transformer connects described DC high-voltage power supply current sampling circuit; First output of described transformer connects an end of second electric capacity, the positive pole of described second diode of the second output termination of described transformer, the other end of described second electric capacity is connected with the negative pole of described second diode, described second electric capacity also is connected the first terminal of described the 3rd electric capacity and the positive pole of described the 3rd diode with the common junction of described second diode, the negative pole of described the 3rd diode connects the positive pole of described the 4th diode, the negative pole of described the 4th diode connects second terminal of described the 3rd electric capacity, and described the 4th diode and the common junction of described the 3rd electric capacity also are connected the positive pole of described the 5th diode;
Second output of described transformer also connects the first terminal of described the 4th electric capacity, second terminal of described the 4th electric capacity connects the common junction of described the 3rd diode and described the 4th diode, and connect the first terminal of described the 5th electric capacity, second terminal of described the 5th electric capacity is connected with the negative pole of described the 5th diode, and the output that this common junction forms high-voltage DC power supply links to each other with load.
3. DC high-voltage power supply current sampling circuit according to claim 1, it is characterized in that, described reverse amplification circuit comprises: the 3rd resistance, the 4th resistance, the 5th resistance and first integrated circuit, one end of described the 3rd resistance connects described DC high-voltage power supply current sampling circuit, the other end is connected to second pin of described first integrated circuit, also be connected to first pin of described first integrated circuit by described the 4th resistance, the 3rd pin of described first integrated circuit is by described the 5th grounding through resistance, the 4th pin ground connection of described first integrated circuit.
4. DC high-voltage power supply, comprise DC high-voltage power supply current sampling circuit, high-voltage rectifier and reverse amplification circuit, described DC high-voltage power supply current sampling circuit connects described high-voltage rectifier and described reverse amplification circuit respectively, it is characterized in that: described DC high-voltage power supply current sampling circuit comprises second resistance, first diode, first resistance that is connected in parallel and first electric capacity, the first terminal of described second resistance connects the positive pole of described first diode, and described second resistance is connected high-voltage rectifier with the common junction of described first diode; Second terminal of described second resistance is connected to first common junction of described first resistance and described first electric capacity, and described first common junction connects reverse amplification circuit;
Described first diode is two-way TVS pipe, and the negative pole of described first diode is connected to second common junction of described first resistance and described first electric capacity, and the described second common junction ground connection.
5. DC high-voltage power supply according to claim 4, it is characterized in that: described high-voltage rectifier comprises transformer, second diode, the 3rd diode, the 4th diode, the 5th diode, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, and second output of described transformer connects described DC high-voltage power supply current sampling circuit;
First output of described transformer connects an end of second electric capacity, the positive pole of described second diode of the second output termination of described transformer, the other end of described second electric capacity is connected with the negative pole of described second diode, described second electric capacity also is connected the first terminal of described the 3rd electric capacity and the positive pole of described the 3rd diode with the common junction of described second diode, the negative pole of described the 3rd diode connects the positive pole of described the 4th diode, the negative pole of described the 4th diode connects second terminal of described the 3rd electric capacity, and described the 4th diode and the common junction of described the 3rd electric capacity also are connected the positive pole of described the 5th diode;
Second output of described transformer also connects the first terminal of described the 4th electric capacity, second terminal of described the 4th electric capacity connects the common junction of described the 3rd diode and described the 4th diode, and connect the first terminal of described the 5th electric capacity, second terminal of described the 5th electric capacity is connected with the negative pole of described the 5th diode, and the output that this common junction forms high-voltage DC power supply links to each other with load.
6. DC high-voltage power supply according to claim 4, it is characterized in that: described reverse amplification circuit comprises: the 3rd resistance, the 4th resistance, the 5th resistance and first integrated circuit, one end of described the 3rd resistance connects described DC high-voltage power supply current sampling circuit, the other end is connected to second pin of described first integrated circuit, also be connected to first pin of described first integrated circuit by described the 4th resistance, the 3rd pin of described first integrated circuit is by described the 5th grounding through resistance, the 4th pin ground connection of described first integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200206241U CN202059320U (en) | 2011-01-21 | 2011-01-21 | Direct current high voltage supply current sampling circuit and direct current high voltage supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200206241U CN202059320U (en) | 2011-01-21 | 2011-01-21 | Direct current high voltage supply current sampling circuit and direct current high voltage supply |
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| Publication Number | Publication Date |
|---|---|
| CN202059320U true CN202059320U (en) | 2011-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200206241U Expired - Fee Related CN202059320U (en) | 2011-01-21 | 2011-01-21 | Direct current high voltage supply current sampling circuit and direct current high voltage supply |
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| CN (1) | CN202059320U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155498A (en) * | 2013-05-13 | 2014-11-19 | 苏州工业园区新宏博通讯科技有限公司 | High-voltage hot-swap sampling circuit |
-
2011
- 2011-01-21 CN CN2011200206241U patent/CN202059320U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155498A (en) * | 2013-05-13 | 2014-11-19 | 苏州工业园区新宏博通讯科技有限公司 | High-voltage hot-swap sampling circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111130 Termination date: 20140121 |