CN2899224Y - Intermediate power-supply overvoltage protector - Google Patents
Intermediate power-supply overvoltage protector Download PDFInfo
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- CN2899224Y CN2899224Y CN 200620078958 CN200620078958U CN2899224Y CN 2899224 Y CN2899224 Y CN 2899224Y CN 200620078958 CN200620078958 CN 200620078958 CN 200620078958 U CN200620078958 U CN 200620078958U CN 2899224 Y CN2899224 Y CN 2899224Y
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Abstract
The utility model relates to a power-supply protection technique, in particular to an intermediate power-supply over-voltage protector, which is characterized in that the input of a frequency conversion output unit is electrically connected to the 220V/50Hz alternative current, the frequency conversion output unit is electrically connected with a sample unit, the sample unit is electrically connected with a comparative unit, the output of the comparative unit is electrically connected with a control unit which comprises a control switch connecting with the output of the frequency conversion output unit and the load loop, which is adaptive to the intermediate power-supply over-voltage protector of 400-1000Hz alternative current power-supply.
Description
Technical field
The utility model relates to a kind of power protection, particularly the intermediate frequency power supply overvoltage protection.
Background technology
Existing voltage protection is all at 220V/50Hz or 380V/50Hz and design; its given prime design requirement is mainly according to 50Hz or 60Hz frequency; but in the intermediate frequency power supply field that needs especially, She Ji device is unconformable like this, and product can be subjected to overvoltage and damage.
Summary of the invention
The purpose of this utility model provides a kind of intermediate frequency power supply overvoltage protection, and it can adapt to the intermediate frequency power supply overvoltage protection with 400～1000Hz AC-powered.
The purpose of this utility model is to realize like this; the intermediate frequency power supply overvoltage protection; it is characterized in that: the input of frequency conversion output unit 1 is electrically connected with alternating current 220V/50Hz; frequency conversion output unit 1 is electrically connected with sampling unit 2; sampling unit 2 is electrically connected with comparing unit 3; comparing unit 3 outputs are electrically connected with control unit 5, and control unit 5 comprises switch 7, and switch 7 is serially connected in the output in frequency conversion output unit 1 and load 6 loops.
Described sampling unit 2 is to constitute like this, extracts the 115V sampling voltage at the output of frequency conversion output unit 1 by sample resistance RW, and the sampling voltage that is obtained by resistance R W dividing potential drop is input to the in-phase end of comparator LM339; By 115V by behind current-limiting resistance R0 and the voltage-stabiliser tube DW, export a low voltage value at voltage-stabiliser tube DW, in order to obtain high-precision reference voltage, at voltage-stabiliser tube DW output and be connected to standard of precision voltage integrated circuit LM385, produce reference voltage 4 by LM385, reference voltage 4 is input to the end of oppisite phase of LM339.
The output of described frequency conversion output unit 1 also is connected to two-way TVS pipe 9.
Described control unit 5 is made of triode 9013 and relay, and transistor base is electrically connected with the output of LM339, emitter be electrically connected; Collector electrode with an end of relay coil be electrically connected, the other end of relay coil is electrically connected with power supply.
The utility model has the advantages that: since the frequency conversion output unit provide sampling voltage constantly and comparing unit compare; when the power supply transient overvoltage; compare through quick comparator with precision voltage reference; if overvoltage occurs; then cut off the power supply of product, product is protected by control circuit.Therefore its reliability improves greatly.
Description of drawings
The invention will be further described below in conjunction with the embodiment accompanying drawing.
Fig. 1 is the embodiment circuit block diagram;
Fig. 2 is circuit theory diagrams.
Among the figure: 1, frequency conversion output unit; 2, sampling unit; 3, comparing unit; 4, reference voltage; 5, control unit; 6, load; 7, switch; 8, alternating current; 9, two-way TVS pipe.
Embodiment
Embodiment as shown in Figure 1, the input of frequency conversion output unit 1 is electrically connected with alternating current 220V/50Hz, frequency conversion output unit 1 is electrically connected with sampling unit 2, sampling unit 2 is electrically connected with comparing unit 3, comparing unit 3 outputs are electrically connected with control unit 5, control unit 5 comprises switch 7, and switch 7 is serially connected in the output in frequency conversion output unit 1 and load 6 loops.
With 115V/400Hz is example, and alternating current 8 is 220V/50Hz, convert the 115V/400Hz intermediate frequency power supply to by frequency conversion output unit 1 after, supply load 6.In order to protect load 6 not to be subjected to 220V/50Hz power supply or intermediate frequency power supply to cause transient overvoltage to impact than great fluctuation process; output at frequency conversion output unit 1 extracts the 115V sampling voltage by sampling unit 2; sampling voltage is input to comparing unit 3 relatively with reference voltage 4; when sampling voltage during greater than reference voltage 4; comparing unit 3 provides high level; by control unit cut-off switch 7, at this moment frequency conversion output unit 1 will disconnect the 115V/400Hz voltage of supply load 6.Reach the purpose of protection load 6.
Because the time of transient overvoltage is very short,, require comparing unit 3 and sampling unit 2 to have quick response according to setting the overvoltage protection scope.Its index has 2 points:
A) when input voltage during greater than 115V+10% (about 130V, i.e. instantaneous value 180V), control unit 5 is cut off the electricity supply operate time of output less than 100ms;
B) when input voltage during greater than 115V+20% (about 140V, i.e. instantaneous value 200V), two-way TVS pipe 9 is cut off the electricity supply operate time of output less than 100ns;
Fig. 2 provides the circuit theory diagrams of concrete enforcement circuit 1.
As shown in Figure 2, same as in figure 1 equally, alternating current 8 is 220V/50Hz, converts supply load 6 behind the 115V/400Hz intermediate frequency power supply to by frequency conversion output unit 1.Sampling unit 2 is to constitute like this, extracts the 115V sampling voltage at the output of frequency conversion output unit 1 by sample resistance RW, and the sampling voltage that is obtained by resistance R W dividing potential drop is input to the in-phase end of comparator LM339; By 115V by behind current-limiting resistance R0 and the voltage-stabiliser tube DW, export a low voltage value at voltage-stabiliser tube DW, in order to obtain high-precision reference voltage, at voltage-stabiliser tube DW output and be connected to standard of precision voltage integrated circuit LM385, produce reference voltage 4 by LM385, reference voltage 4 is input to the end of oppisite phase of LM339.When reference voltage 4 is lower than sampling voltage, what the output of LM339 provided is low-voltage, when reference voltage 4 is higher than sampling voltage (220V/50Hz power supply or intermediate frequency power supply cause moment excessively than great fluctuation process), the output of LM339 is given the input that is input to control unit 5.Control unit 5 is made of triode 9013 and relay, and transistor base is electrically connected with the output of LM339, emitter be electrically connected; Collector electrode with an end of relay coil be electrically connected, the other end of relay coil is electrically connected with power supply.When the output of LM339 provided high voltage, control unit 5 drove relay, and the normally closed switch of relay is disconnected, and at this moment intermediate frequency power supply disconnects the voltage of supply load 6.LM339 can replace with comparator at a high speed, selects the high speed voltage comparator of 40ns.In order to reach multiple protective, at the output of frequency conversion output unit 1 and be connected to two-way TVS pipe 9.When input voltage during, export at 100ns internal cutting off power supply greater than 115V+20% (about 140V, i.e. instantaneous value 200V).
The utlity model has advantages such as portable, reliable, easy to use, simple to operate, that reaction is quick; this protective device has been arranged; the input power supply of product has just had dual overvoltage protection; improved the reliability of product input power supply greatly; make product that stable, a power supply input reliably be arranged, the tremendous economic loss of having avoided the transient overvoltage because of power supply to cause effectively.
Claims (4)
1, intermediate frequency power supply overvoltage protection; it is characterized in that: the input of frequency conversion output unit (1) is electrically connected with alternating current 220V/50Hz; frequency conversion output unit (1) is electrically connected with sampling unit (2); sampling unit (2) is electrically connected with comparing unit (3); comparing unit (3) output is electrically connected with control unit (5); control unit (5) comprises switch (7), and switch (7) is serially connected in the output in frequency conversion output unit (1) and load (6) loop.
2, intermediate frequency power supply overvoltage protection according to claim 1, it is characterized in that: described sampling unit (2) is to constitute like this, extract the 115V sampling voltage at the output of frequency conversion output unit (1) by sample resistance RW, the sampling voltage that is obtained by resistance R W dividing potential drop is input to the in-phase end of comparator LM339; By 115V by behind current-limiting resistance R0 and the voltage-stabiliser tube DW, export a low voltage value at voltage-stabiliser tube DW, in order to obtain high-precision reference voltage, at voltage-stabiliser tube DW output and be connected to standard of precision voltage integrated circuit LM385, produce reference voltage (4) by LM385, reference voltage (4) is input to the end of oppisite phase of LM339.
3, intermediate frequency power supply overvoltage protection according to claim 1 is characterized in that: the output of described frequency conversion output unit (1) also is connected to two-way TVS pipe (9).
4, intermediate frequency power supply overvoltage protection according to claim 1 is characterized in that: described control unit (5) is made of triode 9013 and relay, and transistor base is electrically connected with the output of LM339, emitter be electrically connected; Collector electrode with an end of relay coil be electrically connected, the other end of relay coil is electrically connected with power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620078958 CN2899224Y (en) | 2006-05-11 | 2006-05-11 | Intermediate power-supply overvoltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620078958 CN2899224Y (en) | 2006-05-11 | 2006-05-11 | Intermediate power-supply overvoltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2899224Y true CN2899224Y (en) | 2007-05-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620078958 Expired - Lifetime CN2899224Y (en) | 2006-05-11 | 2006-05-11 | Intermediate power-supply overvoltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2899224Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208782A (en) * | 2013-04-17 | 2013-07-17 | 徐达 | Comprehensive detection and electric protection device for power frequency and variable frequency power supplies |
| CN105226605A (en) * | 2015-10-22 | 2016-01-06 | 江苏绿扬电子仪器集团有限公司 | A kind of high-precision signal source output overvoltage protection circuit |
-
2006
- 2006-05-11 CN CN 200620078958 patent/CN2899224Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208782A (en) * | 2013-04-17 | 2013-07-17 | 徐达 | Comprehensive detection and electric protection device for power frequency and variable frequency power supplies |
| CN103208782B (en) * | 2013-04-17 | 2015-09-09 | 徐达 | The comprehensive detection of a kind of power frequency and variable frequency power supply and Protector for using electricity |
| CN105226605A (en) * | 2015-10-22 | 2016-01-06 | 江苏绿扬电子仪器集团有限公司 | A kind of high-precision signal source output overvoltage protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: XI AN NORTH PHOTOELECTRIC TECHNOLOGY + DEFENSE CO. Free format text: FORMER OWNER: BEIFANG PHOTOELECTRIC CO., LTD., XI AN Effective date: 20111221 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20111221 Address after: 710043 Changle Middle Road, Shaanxi, China, No. 35, No. Patentee after: Xi'an North Electro-optic Technology Defense Co., Ltd. Address before: 710043 Changle Middle Road, Shaanxi, China, No. 35, No. Patentee before: Beifang Photoelectric Co., Ltd., Xi'an |
|
| CX01 | Expiry of patent term |
Granted publication date: 20070509 |
|
| EXPY | Termination of patent right or utility model |