CN103852638A - Detection circuit for detecting power frequency output frequency - Google Patents
Detection circuit for detecting power frequency output frequency Download PDFInfo
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- CN103852638A CN103852638A CN201410102409.4A CN201410102409A CN103852638A CN 103852638 A CN103852638 A CN 103852638A CN 201410102409 A CN201410102409 A CN 201410102409A CN 103852638 A CN103852638 A CN 103852638A
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Abstract
The invention relates to a detection circuit for detecting the power frequency output frequency. The BS, the BAL and the VCC+ of a comparator are connected to be connected with a grounded capacitor C2, a supply voltage +5VVFI, a resistor R3 and a resistor R4 are further connected to the BS of the comparator, the resistor R3 and the resistor R4 are connected in series, one end of the resistor R3 is connected with the grounded end of the capacitor C2, the common end of the resistor R3 and the resistor R4 is connected with the IN- of the comparator U1, the VCC- and the EO of the comparator are connected with the grounded end of the capacitor C2, the CO of the comparator is connected with a resistor R5 and a resistor R6, the resistor R5 and the resistor R6 are connected in parallel, the resistor R5 is connected with the supply voltage +5VVFI, the resistor R6 is connected with the base of a triode Q1, the IN+ of the comparator is further connected with a low-voltage test signal circuit, and the IN+ and the IN- of the comparator are further connected with a capacitor C3. The detection circuit is stable in signal conversion, capable of effectively eliminating glitches, and capable of expanding the input signal scope.
Description
Technical field
The present invention relates to a kind of signal deteching circuit, relate in particular the testing circuit for detection 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.
Summary of the invention
The invention provides a kind of testing circuit for detection 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 present invention is by the following technical solutions: for detection of 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 invention has the beneficial effects as follows: this testing circuit for detection of power frequency output frequency of the present invention's 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 present invention is described in further detail.
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Embodiment
The testing circuit for detection 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 embodiments of the invention.The present invention is not limited to above-mentioned embodiment, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
Claims (6)
1. for detection of 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 for detection 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 for detection 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 for detection of power frequency output frequency according to claim 1, is characterized in that: described comparer U1 selects LM211D type comparer.
5. the testing circuit for detection 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 for detection 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 |
|---|---|---|---|
| CN201410102409.4A CN103852638B (en) | 2014-03-19 | 2014-03-19 | For detecting the testing circuit of power frequency output frequency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102409.4A CN103852638B (en) | 2014-03-19 | 2014-03-19 | For detecting the testing circuit of power frequency output frequency |
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| CN103852638A true CN103852638A (en) | 2014-06-11 |
| CN103852638B CN103852638B (en) | 2016-03-23 |
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| CN201410102409.4A Active CN103852638B (en) | 2014-03-19 | 2014-03-19 | For detecting the testing circuit of power frequency output frequency |
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Citations (8)
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|---|---|---|---|---|
| CN2090065U (en) * | 1991-04-30 | 1991-12-04 | 沈阳冶炼厂 | Pocket high resolving power and frequency measuring instrument |
| US5926042A (en) * | 1997-12-19 | 1999-07-20 | Advanced Micro Devices, Inc. | Precision clock frequency detector having reduced supply voltage dependence |
| CN1480580A (en) * | 2002-09-03 | 2004-03-10 | 金羚电器有限公司 | System for automatic detecting and controlling power supply frequency and method applied to waching machine |
| CN101226077A (en) * | 2008-02-13 | 2008-07-23 | 华北电力大学 | Method for improving measurement precision of turbo unit shafting torsional vibration |
| CN202649308U (en) * | 2012-06-13 | 2013-01-02 | 深圳市鸿捷源自动化系统有限公司 | EtherCAT bus based frequency detection device |
| CN202757999U (en) * | 2012-08-17 | 2013-02-27 | 佛山市柏克新能科技股份有限公司 | Frequency and phase position detector for AC power supply |
| CN103592511A (en) * | 2013-11-13 | 2014-02-19 | 广州松下空调器有限公司 | Circuit for detecting alternating current power supply frequency |
| CN203759117U (en) * | 2014-03-19 | 2014-08-06 | 成都引众数字设备有限公司 | Power frequency output frequency detection circuit |
-
2014
- 2014-03-19 CN CN201410102409.4A patent/CN103852638B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2090065U (en) * | 1991-04-30 | 1991-12-04 | 沈阳冶炼厂 | Pocket high resolving power and frequency measuring instrument |
| US5926042A (en) * | 1997-12-19 | 1999-07-20 | Advanced Micro Devices, Inc. | Precision clock frequency detector having reduced supply voltage dependence |
| CN1480580A (en) * | 2002-09-03 | 2004-03-10 | 金羚电器有限公司 | System for automatic detecting and controlling power supply frequency and method applied to waching machine |
| CN101226077A (en) * | 2008-02-13 | 2008-07-23 | 华北电力大学 | Method for improving measurement precision of turbo unit shafting torsional vibration |
| CN202649308U (en) * | 2012-06-13 | 2013-01-02 | 深圳市鸿捷源自动化系统有限公司 | EtherCAT bus based frequency detection device |
| CN202757999U (en) * | 2012-08-17 | 2013-02-27 | 佛山市柏克新能科技股份有限公司 | Frequency and phase position detector for AC power supply |
| CN103592511A (en) * | 2013-11-13 | 2014-02-19 | 广州松下空调器有限公司 | Circuit for detecting alternating current power supply frequency |
| CN203759117U (en) * | 2014-03-19 | 2014-08-06 | 成都引众数字设备有限公司 | Power frequency output frequency detection circuit |
Non-Patent Citations (2)
| Title |
|---|
| 陈旭东等: "频率信号监测电路的设计与实现", 《计量与测试技术》, vol. 38, no. 10, 31 December 2011 (2011-12-31) * |
| 韩正伟等: "一种基于MSP430单片机的交流频率检测系统", 《微计算机信息》, vol. 22, no. 102, 31 December 2006 (2006-12-31) * |
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| CN103852638B (en) | 2016-03-23 |
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