CN204789728U - FPC alternating voltage detection circuitry and variable frequency air conditioner - Google Patents
FPC alternating voltage detection circuitry and variable frequency air conditioner Download PDFInfo
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- CN204789728U CN204789728U CN201520534951.7U CN201520534951U CN204789728U CN 204789728 U CN204789728 U CN 204789728U CN 201520534951 U CN201520534951 U CN 201520534951U CN 204789728 U CN204789728 U CN 204789728U
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- 238000004378 air conditioning Methods 0.000 claims description 5
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- 238000004364 calculation method Methods 0.000 description 1
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Abstract
The utility model discloses a FPC alternating voltage detection circuitry, enlarge the module including alternating voltage sampling module and operation, the input of alternating voltage sampling module is used for external commercial power, the output logical product of alternating voltage sampling module enlargies the input connection of module, the sample voltage that the sample of pair of module alternating voltage sampling module is enlargied in the operation enlargies to sample voltage after output is enlargied, the operation is enlargied the module and is included voltage amplification unit, filtering unit and voltage clamp unit, the voltage amplification unit respectively with filtering unit and voltage clamp unit electric connection. The utility model also discloses a variable frequency air conditioner. The utility model discloses an enlarge the processing to sample voltage, can detect the change of commercial power accurately, still have low in production cost, occupy the long -pending little advantage of PCB face.
Description
Technical field
The utility model relates to voltage detecting field, particularly relates to FPC ac voltage detection circuit and convertible frequency air-conditioner.
Background technology
Need to detect line voltage and change in voltage in convertible frequency air-conditioner research and development, carry out corresponding control and export, or carry out corresponding safeguard measure, thus ensure that air-conditioning runs stably.And detect in application circuit at the PFC alternating voltage of convertible frequency air-conditioner, two kinds of modes below most employing detect: one utilizes transformer to detect alternating voltage circuit, as shown in Figure 1, this circuit comprises transformer T1, diode D1, resistance R1, polar capacitor E1, diode D2, sample resistance R1 and pull-up resistor R2, single-chip microprocessor MCU is delivered to after the alternating voltage of transformer is sampled by resistance R1, this single-chip microprocessor MCU determines the ac voltage inputted according to the turn ratio of its primary coil and secondary coil, this mode is usually when input voltage has larger change, output voltage just has significant change, but its electrical voltage point that can adopt is few, and the cost of transformer own is high, the area taking pcb board is large.Another kind utilizes bridge rectifier to detect alternating voltage circuit, as shown in Figure 2, this circuit comprises bridge rectifier cells D B1, electric capacity C1, divider resistance RL, diode D1, diode D2, electric capacity C2, sample resistance R1-R4, load R5 and single-chip microprocessor MCU, this circuit is after bridge rectifier, its shortcoming works as stabilized input voltage, and during heavier loads, the voltage after bridge rectifier can decline, affect the sampling of sample circuit to voltage, therefore the voltage error detected is large.
Utility model content
Fundamental purpose of the present utility model be to solve existing AC detection circuit poor accuracy is detected to alternating voltage and production cost high, take the technical matters that pcb board area is large.
For achieving the above object, the utility model provides a kind of FPC ac voltage detection circuit, comprise alternating voltage sampling module and operation amplifier module, the input end of described alternating voltage sampling module is used for external civil power, and the output terminal of described alternating voltage sampling module is connected with the input end of operation amplifier module;
Described operation amplifier module is amplified the sampled voltage that alternating voltage sampling module samples, and exports the sampled voltage after amplifying; Described operation amplifier module comprises voltage amplification unit, filter unit and voltage clamping unit, and described voltage amplification unit is electrically connected with filter unit and voltage clamping unit respectively.
Preferably, described voltage amplification unit comprises integrated operational amplifier, the first resistance, the second resistance and the 3rd resistance, first pin of described integrated operational amplifier connects one end of the second resistance, indirect first resistance of crus secunda and the first pin, tripod connects the first preset voltage by the 3rd resistance, 4th pin ground connection, the 5th pin connects the second preset voltage, and another termination of described second resistance detects output terminal.。
Preferably, described filter unit comprises the first electric capacity, the second electric capacity and the 3rd electric capacity, termination second resistance of described first electric capacity and the common junction detecting output terminal and be connected, described first electric capacity other end ground connection; Described second electric capacity and the 3rd electric capacity also connect, and near the 3rd capacitance cathode a termination described in the common junction that is connected with described second preset voltage of the 5th pin of integrated operational amplifier, one end ground connection of close 3rd electric capacity negative pole.
Preferably, described voltage clamping unit is the first diode, and the positive pole of described first diode connects the second resistance and the common junction detecting output terminal and be connected, and the negative pole of described first diode connects described second preset voltage.
Preferably, described alternating voltage sampling module comprises for the positive voltage sampling unit of the positive half cycle of civil power of sampling and the negative voltage sampling unit for civil power negative half period of sampling.
Preferably, described negative voltage sampling unit comprises the first dividing potential drop assembly, the 4th resistance, the 4th electric capacity and the second diode, and described positive voltage sampling unit comprises the second dividing potential drop resistor, the 5th resistance, the 4th electric capacity and the 3rd diode; Described first dividing potential drop assembly is connected with the 4th resistance, and the positive pole of another termination second diode of described 4th resistance, the negative pole of described second diode connects described operation amplifier module, described second dividing potential drop resistor is connected with the 5th resistance, and the positive pole of another termination the 3rd diode of described 5th resistance, the negative pole of described 3rd diode connects described operation amplifier module, the common junction that one termination first dividing potential drop assembly of described 4th electric capacity is connected with the 4th resistance, the common junction that another termination second dividing potential drop assembly of described 4th electric capacity is connected with the 5th resistance.
Preferably, described first dividing potential drop assembly comprises the 6th resistance of serial connection, the 7th resistance and the 8th resistance; Described second dividing potential drop resistor comprises the 9th resistance of serial connection, the tenth resistance and the 11 resistance.
In addition, for achieving the above object, the utility model also provides a kind of convertible frequency air-conditioner, comprise the ac voltage detection circuit for detecting alternating current voltage change and the control module for exporting according to alternating voltage changing value adjustment airconditioning control, described ac voltage detection circuit is FPC ac voltage detection circuit, described FPC ac voltage detection circuit comprises alternating voltage sampling module and operation amplifier module, the input end of described alternating voltage sampling module is outer for connecing civil power, and the output terminal of described alternating voltage sampling module is connected with the input end of operation amplifier module; Described operation amplifier module is amplified the sampled voltage that alternating voltage sampling module samples, and exports the sampled voltage after amplifying; Described operation amplifier module comprises voltage amplification unit, filter unit and voltage clamping unit, and described voltage amplification unit is electrically connected with filter unit and voltage clamping unit respectively.
The utility model FPC ac voltage detection circuit comprises alternating voltage sampling module and operation amplifier module, first utilize the change of real-time voltage in alternating voltage sampling module sampling civil power, sampled voltage amplifies by recycling operation amplifier module, as long as alternating voltage changes a little, output voltage after the voltage amplification process of sampling can produce significant change, improve the accuracy that alternating voltage detects, and the area that this circuit takies pcb board is little, city's power detection circuit compared to existing technology, can reduce design cost and manufacturing cost greatly.
Accompanying drawing explanation
Fig. 1 is the circuit diagram utilizing transformer to detect alternating voltage circuit in prior art;
Fig. 2 is the circuit diagram utilizing bridge rectifier to detect alternating voltage circuit in prior art;
Fig. 3 is the module diagram of the utility model FPC ac voltage detection circuit;
Fig. 4 is the circuit diagram of the utility model FPC ac voltage detection circuit one embodiment;
Fig. 5 is the module diagram of the utility model convertible frequency air-conditioner.
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of FPC ac voltage detection circuit, with reference to Fig. 3, in one embodiment, described FPC ac voltage detection circuit comprises alternating voltage sampling module 11 and operation amplifier module 12, the input end of described alternating voltage sampling module 11 is used for external civil power, and the output terminal of described alternating voltage sampling module 11 is connected with the input end of operation amplifier module 12;
The sampled voltage that described operation amplifier module 12 pairs of alternating voltage sampling modules 11 sample amplifies, and exports the sampled voltage after amplifying.Described operation amplifier module 12 comprises voltage amplification unit 121, filter unit 122 and voltage clamping unit 123, and described voltage amplification unit 121 is electrically connected with filter unit 122 and voltage clamping unit 123 respectively.This circuit first utilizes alternating voltage sampling module 11 to sample the voltage of real-time change in civil power, sampled voltage amplifies by recycling operation amplifier module 12, as long as alternating voltage changes a little, output voltage after the voltage amplification process of sampling can produce significant change, improves the accuracy that alternating voltage detects.
Above-mentioned alternating voltage sampling module 11 and operation amplifier module 12 can adopt surface patch device, and the area taking pcb board is little, can greatly reduce design cost and production cost.In addition, except detecting the generating positive and negative voltage of alternating current, above-mentioned FPC ac voltage detection circuit can detect zero cross signal.
Consult Fig. 4, in a specific embodiment, described voltage amplification unit 121 comprises integrated operational amplifier U1A, the first resistance R9, the second resistance R10 and the 3rd resistance R11, first pin of described integrated operational amplifier U1A connects one end of the second resistance R10, the indirect first resistance R9 of crus secunda and the first pin, tripod connects the first preset voltage by the 3rd resistance R11, the 4th pin ground connection, 5th pin connects the second preset voltage, and described second resistance R10 connects detection output terminal.The first above-mentioned preset voltage is for VCC/2 is for providing an initial steady state to integrated operational amplifier U1A, and the second preset voltage is for VCC is for providing an initial steady state to integrated operational amplifier U1A.This voltage amplification unit has amplification by the first resistance R9 to sampling voltage signal.Concrete enlargement factor changes with the change of the first resistance R9 resistance.
Consult Fig. 4, in a specific embodiment, the common junction that the termination second resistance R10 that described filter unit 122 also comprises the first electric capacity C2 described in the first electric capacity C2, the second electric capacity C3, the 3rd electric capacity E1 is connected with detection output terminal (not marking), described first electric capacity C2 other end ground connection, the first electric capacity C2 is used for carrying out filtering to output signal; Described second electric capacity C3 and the 3rd electric capacity E1 also connects, and the common junction that described in a termination of close 3rd electric capacity E1 positive pole, the 5th pin of integrated operational amplifier U1A is connected with described second preset voltage VCC, near one end ground connection of the 3rd electric capacity E1 negative pole, first electric capacity C3 is used for High frequency filter, 3rd electric capacity E1 is used for low frequency filtering, can improve the filter effect to the second preset voltage VCC by the first electric capacity C3 and the 3rd electric capacity E1.
Consult Fig. 4, in a specific embodiment, described voltage clamping unit is the first diode D9, the positive pole of described first diode D9 connects the second resistance R10 and the common junction detecting output terminal (not marking) and be connected, and the negative pole of described first diode D9 meets described second preset voltage VCC.First diode D9 provides clamp voltage for integrated operational amplifier U1A.
Consult Fig. 4, in a specific embodiment, described alternating voltage sampling module 11 comprises for the positive voltage sampling unit 111 of the positive half cycle of civil power of sampling and the negative voltage sampling unit 112 for civil power negative half period of sampling.Described negative voltage sampling unit 112 comprises the first dividing potential drop assembly (not marking), the 4th resistance R4, the 4th electric capacity C1 and the second diode D1, and described positive voltage sampling unit 111 comprises the second dividing potential drop resistor (not marking), the 5th resistance R8, the 4th electric capacity C1 and the 3rd diode D2, described first dividing potential drop assembly is connected with the 4th resistance R4, and the positive pole of another termination second diode D1 of described 4th resistance R4, the negative pole of described second diode D1 connects described operation amplifier module 12, described second dividing potential drop resistor is connected with the 5th resistance R8, and the positive pole of another termination the 3rd diode D2 of described 5th resistance R8, the negative pole of described 3rd diode D2 connects described operation amplifier module 12, the common junction that the one termination first dividing potential drop assembly of described 4th electric capacity C1 is connected with the 4th resistance R4, the common junction that another termination second dividing potential drop assembly of described 4th electric capacity C1 is connected with the 5th resistance R8.
Consult Fig. 4, in a specific embodiment, described first dividing potential drop assembly comprises the 6th resistance R1, the 7th resistance R2 and the 8th resistance R3 of serial connection.6th resistance R1, the 7th resistance R2 and acting as of the 8th resistance R3 carry out dividing potential drop to civil power.Described second dividing potential drop resistor comprises the 9th resistance R5, the tenth resistance R6 and the 11 resistance R7 of serial connection.The effect of the 9th resistance R5, the tenth resistance R6 and the 11 resistance R7 is also for carry out dividing potential drop to civil power.
For carrying out scheme above better, calculate detection output voltage below by the different AC-input voltage of input.
1, when AC-input voltage is 220VAC, R8 both end voltage is drawn according to bleeder circuit and voltage division formulas: Vr8=(R8/ (R5+R6+R7+R8)) * 220, carry out dividing potential drop with R11 again, draw voltage V3=(R8/ (the R8+R11)) * (VCC/2) of U1A input end in the same way.According to the short voltage V2=V3 drawing U1A reverse input end of void, then amplified by R9, enlargement factor is that (1+R9) draws the voltage that U1A the 1st pin exports.That is: V1=V2* (1+R9).V1 is input to MUC, calculates ac voltage by MCU.
2, when AC-input voltage is 265VAC, R8 both end voltage is drawn according to bleeder circuit and voltage division formulas: Vr8=(R8/ (R5+R6+R7+R8)) * 265, carry out dividing potential drop with R11 again, draw voltage V3=(R8/ (the R8+R11)) * (VCC/2) of U1A input end in the same way.According to the short voltage V2=V3 drawing U1A reverse input end of void, then amplified by R9, enlargement factor is that (1+R9) draws the voltage that U1A the 1st pin exports.That is: V1=V2* (1+R9).V1 is input to MUC, calculates ac voltage by MCU.
3, when AC-input voltage is 165VAC, R8 both end voltage is drawn according to bleeder circuit and voltage division formulas: Vr8=(R8/ (R5+R6+R7+R8)) * 165, carry out dividing potential drop with R11 again, draw voltage V3=(R8/ (the R8+R11)) * (VCC/2) of U1A input end in the same way.According to the short voltage V2=V3 drawing U1A reverse input end of void, then amplified by R9, enlargement factor is that (1+R9) draws the voltage that U1A the 1st pin exports.That is: V1=V2* (1+R9).V1 is input to MUC, calculates ac voltage by MCU.
The magnitude of voltage of sampling voltage, the magnitude of voltage of output voltage can being obtained by above-mentioned computing method, by utilizing MCU, accurately can calculate the change of alternating voltage.
The utility model also provides a kind of convertible frequency air-conditioner, with reference to Fig. 5, in one embodiment, this convertible frequency air-conditioner comprises the ac voltage detection circuit for detecting alternating current voltage change and the control module 2 for exporting according to alternating voltage changing value adjustment airconditioning control, wherein, described ac voltage detection circuit is above-mentioned FPC ac voltage detection circuit 1.The function of this FPC ac voltage detection circuit 1, element and function complete description in the above-described embodiment, repeat no more herein.
The utility model adopts above-mentioned FPC ac voltage detection circuit; accurate voltage detecting data can be obtained; so that control module 2 accurately judges the change of alternating voltage; thus make control accordingly export; thus ensure air-conditioning even running; alternating current too low or too high time close control export or cut off alternating current, be conducive to protect convertible frequency air-conditioner.
These are only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (8)
1. a FPC ac voltage detection circuit, it is characterized in that, described FPC ac voltage detection circuit comprises alternating voltage sampling module and operation amplifier module, the input end of described alternating voltage sampling module is used for external civil power, and the output terminal of described alternating voltage sampling module is connected with the input end of operation amplifier module;
Described operation amplifier module is amplified the sampled voltage that alternating voltage sampling module samples, and exports the sampled voltage after amplifying; Described operation amplifier module comprises voltage amplification unit, filter unit and voltage clamping unit, and described voltage amplification unit is electrically connected with filter unit and voltage clamping unit respectively.
2. FPC ac voltage detection circuit as claimed in claim 1, it is characterized in that, described voltage amplification unit comprises integrated operational amplifier, the first resistance, the second resistance and the 3rd resistance, first pin of described integrated operational amplifier connects one end of the second resistance, indirect first resistance of crus secunda and the first pin, tripod connects the first preset voltage by the 3rd resistance, the 4th pin ground connection, 5th pin connects the second preset voltage, and another termination of described second resistance detects output terminal.
3. FPC ac voltage detection circuit as claimed in claim 1, it is characterized in that, described filter unit comprises the first electric capacity, the second electric capacity and the 3rd electric capacity, termination second resistance of described first electric capacity and the common junction detecting output terminal and be connected, described first electric capacity other end ground connection; Described second electric capacity and the 3rd electric capacity also connect, and near the 3rd capacitance cathode a termination described in the common junction that is connected with described second preset voltage of the 5th pin of integrated operational amplifier, one end ground connection of close 3rd electric capacity negative pole.
4. FPC ac voltage detection circuit as claimed in claim 1, it is characterized in that, described voltage clamping unit is the first diode, and the positive pole of described first diode connects the second resistance and the common junction detecting output terminal and be connected, and the negative pole of described first diode connects described second preset voltage.
5. FPC ac voltage detection circuit as claimed in claim 1, it is characterized in that, described alternating voltage sampling module comprises for the positive voltage sampling unit of the positive half cycle of civil power of sampling and the negative voltage sampling unit for civil power negative half period of sampling.
6. FPC ac voltage detection circuit as claimed in claim 5, it is characterized in that, described negative voltage sampling unit comprises the first dividing potential drop assembly, the 4th resistance, the 4th electric capacity and the second diode, and described positive voltage sampling unit comprises the second dividing potential drop resistor, the 5th resistance, the 4th electric capacity and the 3rd diode; Described first dividing potential drop assembly is connected with the 4th resistance, and the positive pole of another termination second diode of described 4th resistance, the negative pole of described second diode connects described operation amplifier module, described second dividing potential drop resistor is connected with the 5th resistance, and the positive pole of another termination the 3rd diode of described 5th resistance, the negative pole of described 3rd diode connects described operation amplifier module, the common junction that one termination first dividing potential drop assembly of described 4th electric capacity is connected with the 4th resistance, the common junction that another termination second dividing potential drop assembly of described 4th electric capacity is connected with the 5th resistance.
7. FPC ac voltage detection circuit as claimed in claim 6, is characterized in that, described first dividing potential drop assembly comprises the 6th resistance of serial connection, the 7th resistance and the 8th resistance; Described second dividing potential drop resistor comprises the 9th resistance of serial connection, the tenth resistance and the 11 resistance.
8. a convertible frequency air-conditioner, comprise the ac voltage detection circuit for detecting alternating current voltage change and the control module for exporting according to alternating voltage changing value adjustment airconditioning control, it is characterized in that, described ac voltage detection circuit is the FPC ac voltage detection circuit described in any one of claim 1-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520534951.7U CN204789728U (en) | 2015-07-22 | 2015-07-22 | FPC alternating voltage detection circuitry and variable frequency air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520534951.7U CN204789728U (en) | 2015-07-22 | 2015-07-22 | FPC alternating voltage detection circuitry and variable frequency air conditioner |
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| CN204789728U true CN204789728U (en) | 2015-11-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233616A (en) * | 2018-03-06 | 2019-09-13 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of airborne 115V exchange status acquisition interface |
-
2015
- 2015-07-22 CN CN201520534951.7U patent/CN204789728U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233616A (en) * | 2018-03-06 | 2019-09-13 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of airborne 115V exchange status acquisition interface |
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