CN202330537U - Overvoltage detecting circuit based on voltage regulator diode - Google Patents
Overvoltage detecting circuit based on voltage regulator diode Download PDFInfo
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- CN202330537U CN202330537U CN2011204668663U CN201120466866U CN202330537U CN 202330537 U CN202330537 U CN 202330537U CN 2011204668663 U CN2011204668663 U CN 2011204668663U CN 201120466866 U CN201120466866 U CN 201120466866U CN 202330537 U CN202330537 U CN 202330537U
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Abstract
The utility model discloses an overvoltage detecting circuit based on a voltage regulator diode. A detection voltage input positive end is respectively connected with one end of a third resistor and a negative electrode of the voltage regulator diode; a positive electrode of the voltage regulator diode is respectively connected with one end of a first resistor and one end of a second resistor; the other end of the first resistor is connected with a detection voltage input negative end; the other end of the second resistor is respectively connected with a trigger electrode of controlled silicon and one end of a first capacitor; the other end of the first capacitor is connected with a detection voltage input negative end; the other end of the third resistor is connected with a positive electrode of a light emitting diode; a negative electrode of the light emitting diode is connected with a positive electrode of the controlled silicon; a negative electrode of the controlled silicon is connected with a positive electrode of a photoelectric coupler input end; a negative electrode of the photoelectric coupler input end is connected with the detection voltage input end; two ends of a normally open switch are respectively connected with the positive electrode and the negative electrode of the controlled silicon; a secondary positive end of the photoelectric coupler is connected with a fault output positive end; and a secondary negative end of the photoelectric coupler is connected with a fault output negative end. The overvoltage detecting circuit has a simple and reliable circuit, and can greatly reduce a circuit board.
Description
Technical field
The utility model belongs to technical field of measurement and test, particularly a kind of over-voltage detection circuit based on voltage stabilizing diode.
Background technology
At present adopt the thresholding control device of comparer as over-voltage detection circuit at power supply, various system-level over-voltage detection circuit, its problem is to need outer power supply source, even in order to improve the performance of comparer, bipolar power supply need be provided more; And comparer is the voltage-type device, and its interference for the outside is comparatively responsive, if interference voltage is higher than the overvoltage thresholding, and forms certain width, is easy to make the comparer false triggering, causes false-alarm.
The utility model content
The purpose of the utility model is to provide a kind of over-voltage detection circuit based on voltage stabilizing diode; This testing circuit requires to adopt the thresholding control device of voltage stabilizing diode as the overvoltage detection; Controllable silicon is as the latch devices of fault output, be characterized in passive, quick, circuit simple, reliable, volume is little, with low cost, false alarm rate is low.
The technical solution that realizes the utility model purpose is: a kind of over-voltage detection circuit based on voltage stabilizing diode; Detect voltage input anode and connect an end of the 3rd resistance and the negative pole of voltage stabilizing diode respectively; The positive pole of this voltage stabilizing diode connects an end of first resistance and an end of second resistance respectively; Another termination of this first resistance detects voltage input negative terminal; The other end of second resistance connects an end of the silicon controlled trigger electrode and first electric capacity respectively, and another termination of this first electric capacity detects voltage input negative terminal; The positive pole of the other end sending and receiving optical diode of the 3rd resistance, the negative pole of this light emitting diode connects the silicon controlled positive pole, and this silicon controlled negative pole connects the positive pole of photoelectrical coupler input end, and the negative pole of this photoelectrical coupler input end connects and detects voltage input negative terminal; The two ends of normal open switch connect silicon controlled positive pole and negative pole respectively; The secondary positive termination fault output plus terminal of photoelectrical coupler, the secondary negative terminal of photoelectrical coupler connect fault output negative terminal.
The utility model compared with prior art, its remarkable advantage: need not additional power source, circuit is simple, reliable, because device is few, circuit is simple, can reduce circuit board greatly; And, make that the cost of whole testing circuit is very cheap because the device price is very low.And the detection of overvoltage must rely on the certain trigger electric current, and therefore the energy that promptly need trigger has stronger antijamming capability, reduces false-alarm probability greatly.The above characteristics of the utility model are that traditional comparator type detection overvoltage method can't be accomplished.All adopt quick response device owing to entire circuit in addition, so the time that overvoltage detects can be very quick, satisfies the demand of engineering fully.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Description of drawings
Fig. 1 is the novel over-voltage detection circuit theory diagram of the utility model based on stabilivolt.
Embodiment
In conjunction with Fig. 1; The utility model is based on the over-voltage detection circuit of voltage stabilizing diode; Detect voltage input anode and connect an end of the 3rd resistance R 3 and the negative pole of voltage stabilizing diode respectively; The positive pole of this voltage stabilizing diode connects an end of first resistance R 1 and an end of second resistance R 2 respectively; Another termination of this first resistance R 1 detects voltage input negative terminal, and the other end of second resistance R 2 connects the trigger electrode of controllable silicon V3 and an end of first capacitor C 1 respectively, and another termination of this first capacitor C 1 detects voltage input negative terminal; The positive pole of the other end sending and receiving optical diode V4 of the 3rd resistance R 3; The negative pole of this light emitting diode V4 connects the positive pole of controllable silicon V3; The negative pole of this controllable silicon V3 connects the positive pole of photoelectrical coupler V5 input end, and the negative pole of this photoelectrical coupler V5 input end connects and detects voltage input negative terminal; The two ends of normal open switch K1 connect positive pole and the negative pole of controllable silicon V3 respectively; The secondary positive termination fault output plus terminal of photoelectrical coupler V5, the secondary negative terminal of photoelectrical coupler V5 connect fault output negative terminal.
In foregoing circuit, second capacitor C 2 can also be set, the two ends of this second capacitor C 2 connect positive pole and the negative pole of controllable silicon V3 respectively, prevent to disturb.The 3rd capacitor C 3, the three capacitor C 3 also can be set be connected in parallel between fault output plus terminal and the fault output negative terminal, prevent to disturb.
The utility model based on the voltage stabilizing diode of the over-voltage detection circuit of voltage stabilizing diode can for one, two or plural voltage stabilizing diode series connection constitute.When if voltage stabilizing diode is one, detect voltage input anode and connect an end of the 3rd resistance R 3 and the negative pole of the first voltage stabilizing diode V1 respectively, the positive pole of this first voltage stabilizing diode V1 connects the end that connects first resistance R 1 respectively and an end of second resistance R 2.When if voltage stabilizing diode is two; Detect voltage input anode and connect an end of the 3rd resistance R 3 and the negative pole of the first voltage stabilizing diode V1 respectively; The positive pole of this first voltage stabilizing diode V1 connects the negative pole of the second voltage stabilizing diode V2, and the positive pole of this second voltage stabilizing diode V2 connects an end of first resistance R 1 and an end of second resistance R 2 respectively.Stabilivolt more than three gets final product according to the aforesaid way series connection.Voltage stabilizing diode is a silicone tube.
When voltage input+and voltage input-between voltage when being higher than first and second voltage stabilizing diode V1, V2 burning voltage sum; First and second voltage stabilizing diode V1, V2 conducting, thus make the anodal voltage of win voltage stabilizing diode V1 negative pole and the second voltage stabilizing diode V2 be clamped at the burning voltage sum of first and second voltage stabilizing diode V1, V2, if the magnitude of voltage that exceeds is higher than the trigger voltage of controllable silicon V3 trigger end; And energy is enough; Then make the controllable silicon V3 conducting that is triggered, the elementary and voltage input-formation conducting loop of voltage input+through the 3rd resistance R 3 current-limiting resistances, light emitting diode V4, controllable silicon V3 and photoelectrical coupler V5, thus make light emitting diode V4 lamp light indication fault; The elementary conducting that is triggered of photoelectrical coupler V5; Fault output exists if be added in the voltage at controllable silicon V3 two ends, guarantees that promptly the electric current that flows through controllable silicon V3 keeps electric current greater than controllable silicon; Then controllable silicon V3 conducting all the time, thus make that fault is able to latch.When voltage input recovers normal, and normal open switch K1 junction closure, then make controllable silicon V3 by bypass, promptly flowing through the silicon controlled electric current is 0, and controllable silicon ends, and fault is able to reset.When voltage was input as 0, the overvoltage fault was still owing to the silicon controlled electric current of flowing through disappears less than keeping electric current.First capacitor C 1, second capacitor C 2 are and prevent that controllable silicon V3 from opening by mistake logical anti-interference process in the circuit, and the 3rd capacitor C 3 is handled for the deburring protection that fault reports.
In the utility model, stabilivolt is selected 1N53 series voltage stabilizing diode for use, and controllable silicon is selected BT169D for use, and photoelectrical coupler is selected TLP521 for use.At first be choosing of stabilivolt, because the utility model adopts voltage stabilizing diode as overvoltage Threshold detection device, promptly the burning voltage of voltage stabilizing diode has determined the overvoltage detection threshold.In order to guarantee the temperature characterisitic of circuit, choose the voltage stabilizing diode of low-voltage temperature coefficient as far as possible.Because the general voltage temperature coefficient of voltage stabilizing diode that burning voltage is lower is also relatively low, therefore can select for use a plurality of voltage stabilizing diode series connection of hanging down burning voltages to realize the detection of higher overpressure thresholding; In order to guarantee interference free performance, must make the inverse current of stabilivolt enough little in addition, with guarantee by the time electric current enough little, therefore select silicone tube suitable.The rated disspation of voltage stabilizing diode is selected according to the dynamic resistance of the overvoltage limit, triggering impedance loop and voltage stabilizing diode, should be less than the rated disspation of voltage stabilizing diode according to the power consumption that these several calculation of parameter go out; Next is choosing of silicon-controlled device, at first is rated voltage, and the limit of overvoltage has determined the silicon controlled rated voltage to select, and general rated voltage should be greater than 2 ~ 3 times of the limit of overvoltage; Next is that the rated current parameter is selected, and mainly be luminotron and optocoupler on controllable silicon major loop on the utility model circuit, so electric current is less, is generally about 10mA, and rated current can meet the demands greater than 10mA.To the higher occasion of time requirement that overvoltage detects, can select service time controllable silicon faster.More abominable for electromagnetic environment, as to be subject to disturb occasion should be selected the device of bigger some of controllable silicon trigger voltage, electric current.The selection of photoelectrical coupler is selected common optocoupler or high speed photo coupling according to the speed that detects for overvoltage according to the requirement of speed.
The principle of circuit: the burning voltage of voltage stabilizing diode and silicon controlled triggering and conducting voltage sum are the detection threshold of overvoltage.For example: the burning voltage of stabilivolt is Vz, and silicon controlled triggering and conducting voltage is Vg, and then overvoltage threshold voltage Vov is exactly:
When the voltage input is higher than the overvoltage thresholding, trigger the voltage stabilizing diode conducting, the controllable silicon conducting, thus making the conducting of newspaper fault loop, malfunction indicator lamp is lighted, and fault is through the secondary output of photoelectrical coupler.When voltage is lower than the overvoltage thresholding, and the short circuit of fault reset contact, promptly controllable silicon is by bypass, and controllable silicon ends, and the newspaper fault loop opens circuit, and malfunction indicator lamp is extinguished, and fault is reset.
Claims (7)
1. over-voltage detection circuit based on voltage stabilizing diode; It is characterized in that detecting voltage input anode and connect an end of the 3rd resistance (R3) and the negative pole of voltage stabilizing diode respectively; The positive pole of this voltage stabilizing diode connects an end of first resistance (R1) and an end of second resistance (R2) respectively; Another termination of this first resistance (R1) detects voltage input negative terminal; The other end of second resistance (R2) connects the trigger electrode of controllable silicon (V3) and an end of first electric capacity (C1) respectively, and another termination of this first electric capacity (C1) detects voltage input negative terminal; The positive pole of the other end sending and receiving optical diode (V4) of the 3rd resistance (R3); The negative pole of this light emitting diode (V4) connects the positive pole of controllable silicon (V3); The negative pole of this controllable silicon (V3) connects the positive pole of photoelectrical coupler (V5) input end, and the negative pole of this photoelectrical coupler (V5) input end connects and detects voltage input negative terminal; The two ends of normal open switch (K1) connect the positive pole and the negative pole of controllable silicon (V3) respectively; The secondary positive termination fault output plus terminal of photoelectrical coupler (V5), the secondary negative terminal of photoelectrical coupler (V5) connect fault output negative terminal.
2. the over-voltage detection circuit based on voltage stabilizing diode according to claim 1 is characterized in that also comprising second electric capacity (C2), and the two ends of this second electric capacity (C2) connect the positive pole and the negative pole of controllable silicon (V3) respectively, prevents to disturb.
3. the over-voltage detection circuit based on voltage stabilizing diode according to claim 1 is characterized in that also comprising the 3rd electric capacity (C3), and the 3rd electric capacity (C3) is connected in parallel between fault output plus terminal and the fault output negative terminal, prevents to disturb.
4. the over-voltage detection circuit based on voltage stabilizing diode according to claim 1, it is characterized in that voltage stabilizing diode be one, two or the series connection of plural voltage stabilizing diode constitute.
5. the over-voltage detection circuit based on voltage stabilizing diode according to claim 4; When it is characterized in that voltage stabilizing diode is one; Detect voltage input anode and connect an end of the 3rd resistance (R3) and the negative pole of first voltage stabilizing diode (V1) respectively, the positive pole of this first voltage stabilizing diode (V1) connects the end that connects first resistance (R1) respectively and an end of second resistance (R2).
6. the over-voltage detection circuit based on voltage stabilizing diode according to claim 4; When it is characterized in that voltage stabilizing diode is two; Detect voltage input anode and connect an end of the 3rd resistance (R3) and the negative pole of first voltage stabilizing diode (V1) respectively; The positive pole of this first voltage stabilizing diode (V1) connects the negative pole of second voltage stabilizing diode (V2), and the positive pole of this second voltage stabilizing diode (V2) connects an end of first resistance (R1) and an end of second resistance (R2) respectively.
7. according to claim 1 or 4 described over-voltage detection circuits, it is characterized in that voltage stabilizing diode is a silicone tube based on voltage stabilizing diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204668663U CN202330537U (en) | 2011-11-22 | 2011-11-22 | Overvoltage detecting circuit based on voltage regulator diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204668663U CN202330537U (en) | 2011-11-22 | 2011-11-22 | Overvoltage detecting circuit based on voltage regulator diode |
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| Publication Number | Publication Date |
|---|---|
| CN202330537U true CN202330537U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011204668663U Expired - Lifetime CN202330537U (en) | 2011-11-22 | 2011-11-22 | Overvoltage detecting circuit based on voltage regulator diode |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020344A (en) * | 2014-06-24 | 2014-09-03 | 新誉集团有限公司 | Front-stage overvoltage detection device for railway passenger car |
| CN111426871A (en) * | 2020-04-20 | 2020-07-17 | 小熊电器股份有限公司 | Overvoltage indicating circuit, overvoltage indicating method and household appliance |
-
2011
- 2011-11-22 CN CN2011204668663U patent/CN202330537U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020344A (en) * | 2014-06-24 | 2014-09-03 | 新誉集团有限公司 | Front-stage overvoltage detection device for railway passenger car |
| CN104020344B (en) * | 2014-06-24 | 2016-05-25 | 新誉集团有限公司 | Prime overvoltage checkout gear for trolley coach |
| CN111426871A (en) * | 2020-04-20 | 2020-07-17 | 小熊电器股份有限公司 | Overvoltage indicating circuit, overvoltage indicating method and household appliance |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |
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| CX01 | Expiry of patent term |