CN203759117U - Power frequency output frequency detection circuit - Google Patents
Power frequency output frequency detection circuit Download PDFInfo
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- CN203759117U CN203759117U CN201420125042.3U CN201420125042U CN203759117U CN 203759117 U CN203759117 U CN 203759117U CN 201420125042 U CN201420125042 U CN 201420125042U CN 203759117 U CN203759117 U CN 203759117U
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- vfo
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Abstract
The utility model relates to a power frequency output frequency detection circuit. The BS, BAL and VCC+ of a comparator are connected and then are connected to a capacitance C2, and the BS of the comparator is connected to a power supply voltage +5VVF1 and a resistor R3 and a resistor R4, which are in series connection. One end of the resistor R3 is connected to the grounding end of the capacitance C2. The common end of the resistor R3 and the resistor R4 is connected to the IN- of the comparator U1. The VCC- and EO of the comparator are connected to the grounding end of the capacitance C2. The CO of the comparator is connected to a resistor R5 and a resistor R6, which are in parallel connection. The resistor R5 is connected to power supply voltage +5VVF1, and the resistor R6 is connected to the base electrode of a triode Q1. The emitter electrode of the triode Q1 is grounded, and the collector electrode of the triode Q1 is connected to an indicating lamp circuit LEDVFI-. The IN+ of the comparator is also connected to a low-voltage test signal circuit, and the IN+ and IN- of the comparator are also connected to a capacitance C3. The power frequency output frequency detection circuit is advantageous in that signal conversion is stable; glitch can be effectively removed; the range of input signal can be increased.
Description
Technical field
The utility model relates to a kind of signal deteching circuit, relates in particular the testing circuit of power frequency output frequency.
Background technology
Time check instrument, for the precision of checking time, is used for some and counts field accurately, as rocket launching, satellite navigation, astronomical clock etc. need the field that time precision is high.
The power frequency measure portion of the signal plate of time check instrument converts the sinusoidal wave power frequency component of input to square-wave signal and is input to FPGA, is measured the square-wave signal cycle of input, thereby obtain work frequency by FPGA; Sometimes due to external issues or operational issue, can make the output frequency of the work frequency that obtains and setting inconsistent, follow-up signal analysis is gone wrong, thereby reduce time check precision, affect instrument use.
Utility model content
The utility model provides a kind of testing circuit of power frequency output frequency, can detect the power frequency output frequency of power frequency measuring-signal change-over circuit conversion output, to ensure that output frequency conforms to setpoint frequency, there is error in the output frequency solving in the past, affects the problem of instrument time check precision.
For solving above-mentioned technical matters, the utility model is by the following technical solutions: the testing circuit of power frequency output frequency, comprise comparer U1, the pin BS of comparer U1, pin BAL and pin VCC+ are all connected with the capacitor C 2 of ground connection, and described pin BS, pin BAL and pin VCC+ are all connected with high-voltage power supply+15V VFO, the pin VCC-of described comparer U1 connects outside LVPS-15V VFO, between the earth terminal of LVPS-15V VFO and capacitor C 2, be also connected with capacitor C 1, the pin IN-of described comparer U1 connects high-voltage power supply+15V VFO by resistance R 1, described pin IN-is also connected with diode D1, the anodic bonding pin IN-of diode D1, the negative electrode of described diode D1 is connected on the earth terminal of capacitor C 2, the pin EO of described comparer U1 connects the earth terminal of capacitor C 2, the pin CO of described comparer U1 is connected with triode Q1 by resistance R 3, the base stage of triode Q1 is connected with R3, the grounded emitter of described triode Q1, described triode Q1 collector is connected with LED light circuit, LED light circuit is also connected with photo-coupler U2.
Described LED light circuit comprises LED VFO-circuit and LED VFO+ circuit, and LED VFO-circuit one end is connected with the emitter of triode Q1 and the pin 2 of comparer U1, and the described LED VFO-circuit other end connects external LED pilot lamp; Described LED VFO+ circuit comprises resistance R 4 and the resistance R 5 of serial connection, resistance R 4 is connected with external LED pilot lamp, described resistance R 5 is connected with the pin 1 of comparer U1, and the common port of described resistance R 4 and resistance R 5 is connected with external power source+5V VFO and direct earth capacitance C3.
The pin 3 of described photo-coupler U2 meets external power source PWRM+3.3V, after pin 5 ground connection of described photo-coupler U2, be connected with external power source PWRM+3.3V by capacitor C 4, the pin 4 of described photo-coupler U2 is back inspection signal VFO F1 output circuit, and described external power source PWRM+3.3V examines that between signal VFO F1 output circuit, to be also connected with resistance be the resistance R 6 of 470 ohm with returning.
Described comparer U1 selects LM211D type comparer.
Described photo-coupler U2 selects PS9714 type photo-coupler.
Described triode Q1 selects 9013 type triodes.
Compared with prior art, the beneficial effects of the utility model are: the testing circuit of this power frequency output frequency of the utility model design, can detect power frequency output frequency, facilitate follow-up correction, thereby can ensure that output frequency conforms to setpoint frequency, thereby improve output frequency precision, reduce error.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Embodiment
The testing circuit of power frequency output frequency as shown in Figure 1, comprise comparer U1, the pin BS of comparer U1, pin BAL and pin VCC+ are all connected with the capacitor C 2 of ground connection, and described pin BS, pin BAL and pin VCC+ are all connected with high-voltage power supply+15V VFO, the pin VCC-of described comparer U1 connects outside LVPS-15V VFO, between the earth terminal of LVPS-15V VFO and capacitor C 2, be also connected with capacitor C 1, the pin IN-of described comparer U1 connects high-voltage power supply+15V VFO by resistance R 1, described pin IN-is also connected with diode D1, the anodic bonding pin IN-of diode D1, the negative electrode of described diode D1 is connected on the earth terminal of capacitor C 2, the pin EO of described comparer U1 connects the earth terminal of capacitor C 2, the pin CO of described comparer U1 is connected with triode Q1 by resistance R 3, the base stage of triode Q1 is connected with R3, the grounded emitter of described triode Q1, described triode Q1 collector is connected with LED light circuit, LED light circuit is also connected with photo-coupler U2.
Described LED light circuit comprises LED VFO-circuit and LED VFO+ circuit, and LED VFO-circuit one end is connected with the emitter of triode Q1 and the pin 2 of comparer U1, and the described LED VFO-circuit other end connects external LED pilot lamp; Described LED VFO+ circuit comprises resistance R 4 and the resistance R 5 of serial connection, resistance R 4 is connected with external LED pilot lamp, described resistance R 5 is connected with the pin 1 of comparer U1, and the common port of described resistance R 4 and resistance R 5 is connected with external power source+5V VFO and direct earth capacitance C3.
The pin 3 of described photo-coupler U2 meets external power source PWRM+3.3V, after pin 5 ground connection of described photo-coupler U2, be connected with external power source PWRM+3.3V by capacitor C 4, the pin 4 of described photo-coupler U2 is back inspection signal VFO F1 output circuit, and described external power source PWRM+3.3V examines that between signal VFO F1 output circuit, to be also connected with resistance be the resistance R 6 of 470 ohm with returning.
Described comparer U1 selects LM211D type comparer.
Described photo-coupler U2 selects PS9714 type photo-coupler.
Described triode Q1 selects 9013 type triodes.
Output frequency in the present embodiment enters comparer U1 by output frequency circuit VFO-L, by exporting VFO-FI detection signal from pin CO after capacitor C 1 and capacitor C 2 filtering and diode D1 rectification, VFO-FI detection signal amplifies and enters LED light circuit and photo-coupler U2 through triode Q1, and photo-coupler U2 exports back inspection signal VFO F1 after receiving and producing photocurrent after resistance R 6 dividing potential drops and capacitor C 4 filtering.The present embodiment, by above structure, can detect output frequency signal, ensures that output frequency conforms to setpoint frequency, thereby can improve output frequency precision, reduces error.
The pin 1 of photo-coupler U2 is Anode pin, and pin 2 is Cathode pin, and pin 3 is VCC pin, and pin 4 is VO pin, and pin 5 is GND pin, for simplifying the special numeral that adopts of accompanying drawing.
Photo-coupler U2 is contact resistance R6 between pin 3 and pin 4, R6 resistance is 470 ohm, and R6 divides to such an extent that power supply PWRM+3.3V voltage is 0.7 volt, for substituting zero balancing point in the past, thereby can solve LED light in the past and produce the problem of flicker, can normally work always.
Be as mentioned above embodiment of the present utility model.The utility model is not limited to above-mentioned embodiment, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, within all falling into protection domain of the present utility model.
Claims (6)
1. the testing circuit of power frequency output frequency, it is characterized in that: comprise comparer U1, the pin BS of comparer U1, pin BAL and pin VCC+ are all connected with the capacitor C 2 of ground connection, and described pin BS, pin BAL and pin VCC+ are all connected with high-voltage power supply+15V VFO, the pin VCC-of described comparer U1 connects outside LVPS-15V VFO, between the earth terminal of LVPS-15V VFO and capacitor C 2, be also connected with capacitor C 1, the pin IN-of described comparer U1 connects high-voltage power supply+15V VFO by resistance R 1, described pin IN-is also connected with diode D1, the anodic bonding pin IN-of diode D1, the negative electrode of described diode D1 is connected on the earth terminal of capacitor C 2, the pin EO of described comparer U1 connects the earth terminal of capacitor C 2, the pin CO of described comparer U1 is connected with triode Q1 by resistance R 3, the base stage of triode Q1 is connected with R3, the grounded emitter of described triode Q1, described triode Q1 collector is connected with LED light circuit, LED light circuit is also connected with photo-coupler U2.
2. the testing circuit of power frequency output frequency according to claim 1, it is characterized in that: described LED light circuit comprises LED VFO-circuit and LED VFO+ circuit, LED VFO-circuit one end is connected with the emitter of triode Q1 and the pin 2 of comparer U1, and the described LED VFO-circuit other end connects external LED pilot lamp; Described LED VFO+ circuit comprises resistance R 4 and the resistance R 5 of serial connection, resistance R 4 is connected with external LED pilot lamp, described resistance R 5 is connected with the pin 1 of comparer U1, and the common port of described resistance R 4 and resistance R 5 is connected with external power source+5V VFO and direct earth capacitance C3.
3. the testing circuit of power frequency output frequency according to claim 1, it is characterized in that: the pin 3 of described photo-coupler U2 meets external power source PWRM+3.3V, after pin 5 ground connection of described photo-coupler U2, be connected with external power source PWRM+3.3V by capacitor C 4, the pin 4 of described photo-coupler U2 is back inspection signal VFO F1 output circuit, and described external power source PWRM+3.3V examines that between signal VFO F1 output circuit, to be also connected with resistance be the resistance R 6 of 470 ohm with returning.
4. the testing circuit of power frequency output frequency according to claim 1, is characterized in that: described comparer U1 selects LM211D type comparer.
5. the testing circuit of power frequency output frequency according to claim 1, is characterized in that: described photo-coupler U2 selects PS9714 type photo-coupler.
6. the testing circuit of power frequency output frequency according to claim 1, is characterized in that: described triode Q1 selects 9013 type triodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420125042.3U CN203759117U (en) | 2014-03-19 | 2014-03-19 | Power frequency output frequency detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420125042.3U CN203759117U (en) | 2014-03-19 | 2014-03-19 | Power frequency output frequency detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203759117U true CN203759117U (en) | 2014-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420125042.3U Expired - Fee Related CN203759117U (en) | 2014-03-19 | 2014-03-19 | Power frequency output frequency detection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN203759117U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852638A (en) * | 2014-03-19 | 2014-06-11 | 成都引众数字设备有限公司 | Detection circuit for detecting power frequency output frequency |
-
2014
- 2014-03-19 CN CN201420125042.3U patent/CN203759117U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852638A (en) * | 2014-03-19 | 2014-06-11 | 成都引众数字设备有限公司 | Detection circuit for detecting power frequency output frequency |
| CN103852638B (en) * | 2014-03-19 | 2016-03-23 | 成都引众数字设备有限公司 | For detecting the testing circuit of power frequency output frequency |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20150319 |
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| EXPY | Termination of patent right or utility model |