CN103323659A - Alternating voltage sampling circuit - Google Patents
Alternating voltage sampling circuit Download PDFInfo
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- CN103323659A CN103323659A CN2012100797077A CN201210079707A CN103323659A CN 103323659 A CN103323659 A CN 103323659A CN 2012100797077 A CN2012100797077 A CN 2012100797077A CN 201210079707 A CN201210079707 A CN 201210079707A CN 103323659 A CN103323659 A CN 103323659A
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Abstract
The invention provides an alternating voltage sampling circuit which can conduct sampling on alternating voltages. The alternating voltage sampling circuit comprises an alternating power circuit L, an alternating power circuit N, and at least one voltage comparator which is connected with the alternating power circuit L and the alternating power circuit N. Sampling resistors are further connected between the alternating power circuit L and one voltage comparator, and between the alternating power circuit N and another voltage comparator, and the sampling resistors are glass glaze thick-film resistors which can resist alternating voltage impact. The alternating voltage sampling circuit has the advantages that due to the fact that the glass glaze thick-film resistors which can resist alternating voltage impact are arranged in the alternating voltage sampling circuit, the alternating voltage sampling circuit can conduct low voltage sampling, and in high alternating voltages, can also conduct sampling on the high alternating voltages stably and reliably, provides more accurate data, and further guarantees that the other components in the circuit can run more stably and reliably.
Description
Technical field
The present invention relates to a kind of alternating voltage sampling circuit, relate in particular to a kind of alternating voltage sampling circuit that can sample to high voltage.
Background technology
In existing power protecting circuit; the low pressure sampling is generally adopted in the sampling of power circuit; sample with relevant discharge circuit through sampling resistor again through converting DC voltage behind the transformer to; but the sampling precision of this mode is poor; restricted on the consistance of device, can not effectively react actual numerical value.Simultaneously, product is in actual moving process, because the uncertain factor of on-the-spot voltage, tend to occur power-supply fluctuation, sometimes even the transient voltage value that can occur kilovolt, at this moment voltage sample resistance is because be directly to be connected with power supply, under the impact of the transient voltage of upper kilovolt, the phenomenon that the circuit of voltage sample breaks down can often occur.
In view of this, be necessary existing voltage sampling circuit is improved, to address the above problem.
Summary of the invention
The object of the present invention is to provide a kind of alternating voltage sampling circuit, this alternating voltage sampling circuit not only can carry out the low pressure sampling, can also sample to ac high voltage simultaneously.
For achieving the above object, a kind of alternating voltage sampling circuit of the present invention, it can be sampled to alternating voltage, comprise AC power L, N circuit and at least one voltage comparator that is connected with described AC power L, N circuit, also be connected with sampling resistor between wherein said AC power L, N circuit and the described voltage comparator, described sampling resistor is that ac resistance is pressed the glass glaze thick-film resistor that impacts.
As a further improvement on the present invention, be connected with respectively a glass glaze thick-film resistor on described AC power L, the N circuit.
As a further improvement on the present invention, described glass glaze thick-film resistor is that model is the glass glaze thick-film resistor of 1M/0.5W.
As a further improvement on the present invention, be provided with three voltage comparators in the described alternating voltage sampling circuit.
As a further improvement on the present invention, described first voltage comparator links to each other with AC power L line, second voltage comparator links to each other with AC power N line, and two input ends of the 3rd voltage comparator are connected with the output terminal of first voltage comparator and the output terminal of second voltage comparator respectively.
As a further improvement on the present invention, described alternating voltage sampling circuit is provided with reference voltage value TV1, and described voltage comparator is in order to make comparisons alternating voltage and reference voltage value TV1, to finish the collection of voltage signal.
As a further improvement on the present invention, also being provided with a voltage transitions interface ADU in the described alternating voltage sampling circuit transfers out in order to the voltage signal that will collect.
As a further improvement on the present invention, described alternating voltage sampling circuit can be connected that with the external treatment chip voltage signal that collects is processed by described voltage transitions interface ADU.
As a further improvement on the present invention, described external treatment chip comprises that model is the master chip of PD78F9234.
As a further improvement on the present invention, also include voltage stabilizing diode, electric capacity and some resistance in the described alternating voltage sampling circuit.
Compared with prior art, advantage of the present invention is: alternating voltage sampling circuit of the present invention is pressed the glass glaze thick-film resistor that impacts by being provided with ac resistance, so that alternating voltage sampling circuit of the present invention not only can carry out the low pressure sampling, in ac high voltage, equally can be reliable and stable ac high voltage be sampled, and more accurately data are provided, further guarantee the more reliable and more stable operation of other components and parts in the circuit.
Description of drawings
Fig. 1 is the circuit diagram of alternating voltage sampling circuit of the present invention.
Fig. 2 is the mounting circuit figure of the external treatment chip that is used in conjunction with alternating voltage sampling circuit of the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of alternating voltage sampling circuit of the present invention, it can be sampled to alternating voltage, the sampling resistor (R7, R9) that comprises AC power L, N circuit (11,12), at least one voltage comparator that is connected with described AC power L, N circuit (11,12) and be connected described AC power L, N circuit (11,12) and described voltage comparator.In the present embodiment, described sampling resistor (R7, R9) is the glass glaze thick-film resistor of the ac resistance pressure impact of 1M/0.5W for model, and be connected with respectively such glass glaze thick-film resistor on described AC power L, the N circuit (11,12), thereby described glass glaze thick-film resistor (R7, R9) can directly be sampled, and obtain sampled voltage AC power L, N circuit (11,12).Also include voltage stabilizing diode 13, capacitor C 8 and C12 and some resistance (R8, R10 ~ R12, RW3, R14) in the described alternating voltage sampling circuit, wherein, described resistance R W3 is swept resistance.
Such as Fig. 1 and in conjunction with shown in Figure 2, be provided with three voltage comparators in the alternating voltage sampling circuit of the present invention.Wherein first voltage comparator U4ALM224 links to each other with AC power L line 11, second voltage comparator U4BLM224 links to each other with AC power N line 12, and two input ends of the 3rd voltage comparator U4CLM224 are connected with the output terminal of first voltage comparator U4ALM224 and the output terminal of second voltage comparator U4BLM224 respectively.Described alternating voltage sampling circuit is provided with a reference voltage value TV1, by described three voltage comparators sampled voltage and reference voltage value TV1 is made comparisons, thereby finishes collection to voltage signal.Also be provided with a voltage transitions interface ADU in the described alternating voltage sampling circuit, described voltage transitions interface ADU can be connected described alternating voltage sampling circuit with the external treatment chip, the voltage signal that collects can be flowed to the external treatment chip by described voltage transitions interface ADU, thereby the external treatment chip can be processed to the voltage signal that collects further.In the present embodiment, described external treatment chip is that model is the master chip (as shown in Figure 2) of PD78F9234, it is inner that described voltage transitions interface ADU is delivered to master chip PD78F9234 with the voltage signal that collects the 25th pin by master chip PD78F9234, thereby master chip PD78F9234 can further process the voltage signal that collects.
In sum, alternating voltage sampling circuit of the present invention is pressed the glass glaze thick-film resistor that impacts by be respectively arranged with an ac resistance at its AC power L, N circuit (11,12), thereby so that alternating voltage sampling circuit of the present invention not only can carry out the low pressure sampling, in ac high voltage, its equally can be reliable and stable ac high voltage is sampled, and more accurately data are provided, further guarantee the more reliable and more stable operation of other components and parts in the circuit.
Those of ordinary skill in the art should be understood that the mode that ac high voltage is sampled can have multiple.For example: ac high voltage is converted to DC low-voltage, indirectly finishes sampling to ac high voltage by the mode that DC low-voltage is sampled.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (10)
1. alternating voltage sampling circuit, it can be sampled to alternating voltage, comprise AC power L, N circuit and at least one voltage comparator that is connected with described AC power L, N circuit, it is characterized in that: also be connected with sampling resistor between described AC power L, N circuit and the described voltage comparator, described sampling resistor is that ac resistance is pressed the glass glaze thick-film resistor that impacts.
2. alternating voltage sampling circuit according to claim 1 is characterized in that: be connected with respectively a glass glaze thick-film resistor on described AC power L, the N circuit.
3. alternating voltage sampling circuit according to claim 2, it is characterized in that: described glass glaze thick-film resistor is that model is the glass glaze thick-film resistor of 1M/0.5W.
4. alternating voltage sampling circuit according to claim 1 is characterized in that: be provided with three voltage comparators in the described alternating voltage sampling circuit.
5. alternating voltage sampling circuit according to claim 4, it is characterized in that: described first voltage comparator links to each other with AC power L line, second voltage comparator links to each other with AC power N line, and two input ends of the 3rd voltage comparator are connected with the output terminal of first voltage comparator and the output terminal of second voltage comparator respectively.
6. alternating voltage sampling circuit according to claim 1, it is characterized in that: described alternating voltage sampling circuit is provided with reference voltage value TV1, described voltage comparator is in order to make comparisons alternating voltage and reference voltage value TV1, to finish the collection of voltage signal.
7. alternating voltage sampling circuit according to claim 6 is characterized in that: also be provided with a voltage transitions interface ADU in the described alternating voltage sampling circuit and transfer out in order to the voltage signal that will collect.
8. alternating voltage sampling circuit according to claim 7, it is characterized in that: described alternating voltage sampling circuit can be connected that with the external treatment chip voltage signal that collects is processed by described voltage transitions interface ADU.
9. alternating voltage sampling circuit according to claim 8, it is characterized in that: described external treatment chip comprises that model is the master chip of PD78F9234.
10. alternating voltage sampling circuit according to claim 1 is characterized in that: also include voltage stabilizing diode, electric capacity and some resistance in the described alternating voltage sampling circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100797077A CN103323659A (en) | 2012-03-23 | 2012-03-23 | Alternating voltage sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100797077A CN103323659A (en) | 2012-03-23 | 2012-03-23 | Alternating voltage sampling circuit |
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| Publication Number | Publication Date |
|---|---|
| CN103323659A true CN103323659A (en) | 2013-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100797077A Pending CN103323659A (en) | 2012-03-23 | 2012-03-23 | Alternating voltage sampling circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652079A (en) * | 2016-02-29 | 2016-06-08 | 国网山东省电力公司青岛供电公司 | Alternating-current sampling device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4916570A (en) * | 1989-05-11 | 1990-04-10 | Micron Technology, Inc. | Voltage comparator circuit for monitoring a process output voltage within a preset range |
| US20040263215A1 (en) * | 2003-06-30 | 2004-12-30 | Sunplus Technology Co., Ltd. | Voltage detector |
| CN2783333Y (en) * | 2005-04-08 | 2006-05-24 | 百利通电子(上海)有限公司 | Circuit for identifying ac voltage by external LED |
| US20070223155A1 (en) * | 2006-03-21 | 2007-09-27 | Hon Hai Precision Industry Co., Ltd. | Device for identifying ac power supply arrangement |
| CN201616651U (en) * | 2010-03-31 | 2010-10-27 | 银川英奥特自控有限公司 | Current signal detecting device |
| CN201965224U (en) * | 2010-12-15 | 2011-09-07 | 山东省计量科学研究院 | Automatic school system that examines of proof voltage instrument |
-
2012
- 2012-03-23 CN CN2012100797077A patent/CN103323659A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4916570A (en) * | 1989-05-11 | 1990-04-10 | Micron Technology, Inc. | Voltage comparator circuit for monitoring a process output voltage within a preset range |
| US20040263215A1 (en) * | 2003-06-30 | 2004-12-30 | Sunplus Technology Co., Ltd. | Voltage detector |
| CN2783333Y (en) * | 2005-04-08 | 2006-05-24 | 百利通电子(上海)有限公司 | Circuit for identifying ac voltage by external LED |
| US20070223155A1 (en) * | 2006-03-21 | 2007-09-27 | Hon Hai Precision Industry Co., Ltd. | Device for identifying ac power supply arrangement |
| CN201616651U (en) * | 2010-03-31 | 2010-10-27 | 银川英奥特自控有限公司 | Current signal detecting device |
| CN201965224U (en) * | 2010-12-15 | 2011-09-07 | 山东省计量科学研究院 | Automatic school system that examines of proof voltage instrument |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652079A (en) * | 2016-02-29 | 2016-06-08 | 国网山东省电力公司青岛供电公司 | Alternating-current sampling device |
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Application publication date: 20130925 |