CN103954828B - Voltage detecting circuit and device based on Single-phase PFC - Google Patents
Voltage detecting circuit and device based on Single-phase PFC Download PDFInfo
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- CN103954828B CN103954828B CN201410186974.3A CN201410186974A CN103954828B CN 103954828 B CN103954828 B CN 103954828B CN 201410186974 A CN201410186974 A CN 201410186974A CN 103954828 B CN103954828 B CN 103954828B
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Abstract
The invention discloses a kind of voltage detecting circuit based on Single-phase PFC, including signal-isolated transmission module, DC pulse signal modular converter and software data processing module, the signal-isolated transmission module, for ac voltage signal to be converted into DC pulse moving voltage signal；The DC pulse signal modular converter, for DC pulse moving voltage signal to be converted into analog signal, is allowed to and exchanges vertical compression value and there is linear corresponding relation, so as to detect the voltage magnitude of ac voltage signal；It is additionally operable to be converted to data signal after being compared DC pulse moving voltage signal and reference voltage；The software data processing module, for the data signal transmitted according to DC pulse signal modular converter, calculates zero crossing position.The present invention also provides a kind of voltage check device based on Single-phase PFC, and what the present invention was realized have the beneficial effect that, and circuit structure is simple, stability is high, strong antijamming capability, accuracy of detection are high.
Description
Technical field
The present invention relates to PFC (Power Factor Correction PFCs) detection field, more particularly to base
In the voltage detecting circuit and device of Single-phase PFC.
Background technology
In Single-phase PFC control circuit, generally require to carry out accurately the zero crossing and amplitude of AC input voltage
Detection, but due to the presence of energy-storage travelling wave tube inductance and switch element in the BOOST booster circuits of PFC, cause it is traditional it is non-every
No longer it is applicable from formula voltage detecting mode, how avoids Single-phase PFC circuit power device and switch from making non-isolated sample mode
Into influence and improve the precision of test, be our problem demanding prompt solutions.
The content of the invention
It is a primary object of the present invention to provide a kind of voltage detecting circuit based on Single-phase PFC, it is intended to solve Single-phase PFC
Circuit power device and the switch influence caused to non-isolated sample mode and the problem for improving measuring accuracy.
To achieve the above object, a kind of voltage detecting circuit based on Single-phase PFC that the present invention is provided, including signal isolation
Transport module, DC pulse signal modular converter and software data processing module, wherein,
The signal-isolated transmission module, after ac voltage signal is converted into DC pulse moving voltage signal and amplification
It is transferred to the DC pulse signal modular converter；
The DC pulse signal modular converter, is connected with the signal-isolated transmission module, for by the signal every
The DC pulse moving voltage signal transmitted from transport module is converted to analog signal, is allowed to ac voltage in the presence of linear right
Should be related to, so as to detect the voltage magnitude of ac voltage signal；It is additionally operable to enter DC pulse moving voltage signal and reference voltage
Data signal is converted to after row；
The software data processing module, is connected, for according to DC pulse with the DC pulse signal modular converter
The data signal that signal conversion module is obtained, calculates actual zero crossing position.
Preferably, the signal-isolated transmission module includes：
Ac voltage signal converting unit, for ac voltage signal to be converted into DC pulse moving voltage signal；
Isolation arithmetic element, is connected with the ac voltage signal converting unit, for the ac voltage signal to be turned
Change cell translation DC pulse moving voltage signal be amplified after be transferred to DC pulse signal modular converter.
Preferably, the ac voltage signal converting unit includes first resistor and rectifier bridge, a friendship of the rectifier bridge
Stream input is connected with the L ends of ac voltage signal, another ac input end of the rectifier bridge via the first resistor and
The N-terminal of ac voltage signal is connected.
Preferably, the isolation arithmetic element, is connected with the ac voltage signal converting unit, including second resistance,
First electric capacity and isolation operational amplifier, wherein,
3rd pin and the 5th pin of the isolation operational amplifier are used as the input for isolating arithmetic element, institute
State second resistance be connected to it is described isolation operational amplifier the 3rd pin and the 5th pin between, first capacitance connection in
It is described isolation operational amplifier the 3rd pin and the 5th pin between, it is described isolation operational amplifier the 3rd pin with it is described
The direct-flow positive pole output end of rectifier bridge is connected, the 5th pin for isolating operational amplifier, the 7th pin and the rectifier bridge
Direct current cathode output end and actual test ground be connected, first pin and the first power supply phase of the isolation operational amplifier
Even, it is described isolation operational amplifier the 8th pin be connected with reference ground, it is described isolate operational amplifier the 14th pin and
Second power supply is connected；Tenth pin and the 12nd pin of the isolation operational amplifier are used as the isolation arithmetic element
Output end, the tenth pin of the isolation operational amplifier exports the negative signal of DC pulse moving voltage signal, the isolation
12nd pin of operational amplifier exports the positive signal of DC pulse moving voltage signal.
Preferably, the DC pulse signal modular converter includes：
Analog signal converting unit, is connected with the signal-isolated transmission module, for signal-isolated transmission module to be passed
Defeated DC pulse moving voltage signal amplifies and is converted to analog signal；
Data signal converting unit, is connected with the analog signal converting unit, for analog signal converting unit to be put
Big DC pulse moving voltage signal is converted to data signal after being compared with reference voltage.
Preferably, the first computing end of the analog signal converting unit including amplifier, 3rd resistor, the 4th resistance,
7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity, wherein,
First computing end of the amplifier includes the first pin, second pin, the 3rd pin, the 4th of the amplifier
Pin, the 3rd pin of the amplifier as the analog signal converting unit electrode input end, the of the amplifier
Two pins as the analog signal converting unit negative input, the first pin of the amplifier believes as the simulation
The output end of number converting unit, the 4th pin of the amplifier is connected with reference ground；The 3rd resistor be connected to it is described every
Between the negative signal of DC pulse moving voltage signal and the second pin of the amplifier of arithmetic element output；Described 4th
Resistance is connected to the 3rd of the positive signal for isolating the DC pulse moving voltage signal that arithmetic element is exported and the amplifier
Between pin；Between first pin and second pin of the amplifier, the 7th resistance connects 4th capacitance connection
It is connected between the first pin of the amplifier and second pin；3rd capacitance connection is in the 3rd pin of the amplifier
And the 4th between pin；3rd capacitance connection between the 3rd pin of the amplifier and the 4th pin, the described 8th
Resistance is connected between the 3rd pin of the amplifier and the 4th pin, and the 9th resistance is connected to the of the amplifier
Between one pin and the analog signal of output, the tenth resistance is connected between the analog signal of output and reference ground, described
5th capacitance connection is between the analog signal and reference ground of output.
Preferably, the analog signal converting unit also includes the 5th resistance, the 6th resistance and the second electric capacity, the described 5th
Resistance one end is connected with the 3rd resistor, and the other end of the 5th resistance is connected with the second pin of the amplifier；Institute
The one end for stating the 6th resistance is connected with the 4th resistance, the other end of the 6th resistance and the 3rd pin of the amplifier
It is connected；One end of second electric capacity is connected between the 3rd resistor and the 5th resistance, the other end of second electric capacity
It is connected between the 4th resistance and the 6th resistance.
Preferably, the data signal converting unit includes the second computing end, the 11st resistance, the 12nd electricity of amplifier
Resistance, the 13rd resistance, the 14th resistance, the 6th electric capacity and the 7th electric capacity, wherein,
Second computing end of the amplifier includes the 5th pin, the 6th pin, the 7th pin, the 8th of the amplifier
Pin, the 5th pin of the amplifier as the data signal converting unit electrode input end, the of the amplifier
Six pins as the data signal converting unit negative input, the 7th pin of the amplifier believes as the numeral
The output end of number converting unit, the 8th pin of the amplifier is connected with supply voltage end；5th pin of the amplifier
The DC pulse moving voltage signal amplified with the analog signal converting unit via the 14th resistance is connected, and the described 12nd
One end of resistance is connected with supply voltage end, and the other end of the 12nd resistance is connected with the 6th pin of the amplifier；
6th capacitance connection is between the 6th pin and reference ground of the amplifier；13rd resistance is connected to described putting
Between 6th pin and reference ground of big device；5th pin of the amplifier is connected via the 7th electric capacity with reference ground；
11st resistance is connected between the 5th pin of the amplifier and the 7th pin, and the 7th pin of the amplifier is defeated
Go out data signal.
Preferably, the software data processing module includes：
Sampling unit, is connected with DC pulse signal modular converter, for gathering the output of DC pulse signal modular converter
High level period signal length [ta]；
Memory cell, for storing parameter value [t_delay], the parameter value is the zero crossing position of ac voltage signal
With the zero crossing position and the phase of data signal trailing edge that differ the time [tby] and ac voltage signal of data signal rising edge
Difference between difference time [tbx]；
Computing unit, for the high level period that the time [t_vac] according to power supply half period, sampling unit are collected
Signal length [ta] and the parameter value [t_delay] of memory cell storage, calculate actual zero crossing position [tb], the reality
Zero crossing position [tb]=([t_vac]-[ta]-[t_delay])/2.
A kind of voltage check device based on Single-phase PFC described further, including described circuit.
A kind of voltage detecting circuit based on Single-phase PFC of the present invention, including signal-isolated transmission module, DC pulse signal
Modular converter and software data processing module, wherein, the signal-isolated transmission module, for ac voltage signal to be converted to
The DC pulse signal modular converter is transferred to after DC pulse moving voltage signal and amplification；The DC pulse signal modulus of conversion
Block, is connected with the signal-isolated transmission module, for the DC pulse electricity that the signal-isolated transmission module transfer comes
Pressure signal is converted to analog signal, is allowed to there is linear corresponding relation with ac voltage, so as to detect ac voltage signal
Voltage magnitude；It is additionally operable to be converted to data signal after being compared DC pulse moving voltage signal and reference voltage；It is described soft
Part data processing module, is connected with the DC pulse signal modular converter, for according to DC pulse signal modular converter institute
The data signal of acquisition, calculates actual zero crossing position.Achieved has the beneficial effect that：The present invention is based on Single-phase PFC
Voltage detecting circuit, is effectively isolated actual test with the reference ground of control chip using isolation sampling plan, is resisted
Interference performance is strong, is especially used in input current power factor modulation topology, can solve due to power component and
The sampling that switch brings influences；DC pulse process part, using two integrated circuits of amplifier of encapsulation that in the market is general, makes
Obtaining circuit becomes simplified, and stability is high；Parameter value [t_delay] is introduced when zero crossing is detected, it is effective by exclusive algorithm
Balanced out the influence that hardware circuit is brought, improve accuracy of detection.
Brief description of the drawings
Fig. 1 is the structured flowchart of voltage detecting circuit one embodiment of the present invention based on Single-phase PFC；
Fig. 2 is the circuit diagram of signal-isolated transmission module in Fig. 1；
Fig. 3 is the circuit diagram of DC pulse signal modular converter in Fig. 1；
Fig. 4 is the signal transacting schematic diagram of software data processing module in Fig. 1.
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
A kind of voltage detecting circuit based on Single-phase PFC of present invention offer, reference picture 1, in the present embodiment, the circuit bag
Signal-isolated transmission module 10, DC pulse signal modular converter 20 and software data processing module 30 are included, wherein,
The signal-isolated transmission module 10, for ac voltage signal being converted into DC pulse moving voltage signal and being amplified
After be transferred to the DC pulse signal modular converter 20；
Ac voltage signal is converted to DC pulse moving voltage signal by signal-isolated transmission module 10, by actual test with
The reference ground of control chip is effectively isolated, antijamming capability enhancing, is especially opened up in the modulation of input current power factor
Flutter and use, can solve because the sampling that power component and switch bring influences.
The DC pulse signal modular converter 20, is connected with the signal-isolated transmission module 10, for by the letter
The DC pulse moving voltage signal that number isolated transmission module 10 is transmitted is converted to analog signal, is allowed to and ac voltage is present
Linear corresponding relation, so as to detect the voltage magnitude of ac voltage signal；It is additionally operable to DC pulse moving voltage signal and reference
Voltage is converted to data signal after being compared；
The DC pulse process part of the DC pulse signal modular converter 20, uses the encapsulation two that in the market is general
The integrated circuit of amplifier so that circuit becomes simplified, stability is improved.
The software data processing module 30, is connected, for according to direct current with the DC pulse signal modular converter 20
The data signal that fluctuating signal modular converter 20 is obtained, calculates actual zero crossing position.
The software data processing module 30, parameter value [t_delay] is introduced when zero crossing is detected, by exclusive calculation
Method has effectively balanced out the influence that hardware circuit is brought, and improves accuracy of detection.
In sum, a kind of voltage detecting circuit based on Single-phase PFC of the present embodiment, including signal-isolated transmission module
10th, DC pulse signal modular converter 20 and software data processing module 30, wherein, the signal-isolated transmission module 10 is used
The DC pulse signal modular converter is transferred to after ac voltage signal to be converted to DC pulse moving voltage signal and amplification
20；The DC pulse signal modular converter 20, is connected with the signal-isolated transmission module 10, for by the signal isolation
The DC pulse moving voltage signal that transport module 10 is transmitted is converted to analog signal, is allowed to ac voltage in the presence of linear right
Should be related to, so as to detect the voltage magnitude of ac voltage signal；It is additionally operable to enter DC pulse moving voltage signal and reference voltage
Data signal is converted to after row；The software data processing module 30, with the phase of DC pulse signal modular converter 20
Even, for the data signal obtained according to DC pulse signal modular converter 20, actual zero crossing position is calculated.Institute can be real
Existing has the beneficial effect that：The present invention based on Single-phase PFC voltage detecting circuit, using isolation sampling plan by actual test with
The reference ground of control chip is effectively isolated, strong antijamming capability, especially modulates topology in input current power factor
On use, can solve because power component and the sampling that brings of switch influence；DC pulse process part, uses market
Upper general two integrated circuits of amplifier of encapsulation so that circuit becomes simplified, and stability is high；Ginseng is introduced when zero crossing is detected
Numerical value [t_delay], the influence that hardware circuit is brought effectively has been balanced out by exclusive algorithm, improves detection essence
Degree.
Specifically, with further reference to Fig. 1, signal-isolated transmission module 10 includes described in the present embodiment：
Ac voltage signal converting unit 11, for ac voltage signal to be converted into DC pulse moving voltage signal；
Isolation arithmetic element 12, is connected with the ac voltage signal converting unit 11, for the alternating voltage to be believed
The DC pulse moving voltage signal of number converting unit 11 conversion is transferred to DC pulse signal modular converter 20 after being amplified.
Referring to Fig. 2, the ac voltage signal converting unit 11 described in the present embodiment includes first resistor R1 and rectifier bridge
DB1 a, ac input end of the rectifier bridge DB1 is connected with the L ends of AC power, and another exchange of the rectifier bridge DB1 is defeated
Enter end be connected with the N-terminal of AC power via the first resistor R1, ac voltage signal through the first resistor R1 shunting
Through being converted to DC pulse moving voltage signal by the rectifier bridge DB1 after pressure limiting.
The isolation arithmetic element 12 described in the present embodiment, is connected with the ac voltage signal converting unit 11, bag
Second resistance R2, the first electric capacity C1 and isolation operational amplifier DB1 are included, wherein,
3rd pin and the 5th pin of the isolation operational amplifier IC1 are used as the input for isolating arithmetic element 12
End, the second resistance R2 is connected between the 3rd pin of the isolation operational amplifier IC1 and the 5th pin, and described first
Electric capacity C1 is connected between the 3rd pin of the isolation operational amplifier DB1 and the 5th pin, the isolation operational amplifier
3rd pin of IC1 is connected with the direct-flow positive pole output end of the rectifier bridge DB1, and the 5th of the isolation operational amplifier IC1 the
The direct current cathode output end of pin, the 7th pin and the rectifier bridge DB1 is connected with actual test ground, the isolation operation amplifier
First pin of device IC1 is connected with the first power supply, the 8th pin and reference ground phase of the isolation operational amplifier IC1
Even, the 14th pin of the isolation operational amplifier IC1 is connected with the second power supply；The isolation operational amplifier IC1
The tenth pin and the 12nd pin as it is described isolation arithmetic element 12 output end, the isolation operational amplifier IC1's
Tenth pin exports the negative signal of DC pulse moving voltage signal, the 12nd pin output of the isolation operational amplifier IC1
The positive signal of DC pulse moving voltage signal.DC pulse moving voltage signal is via the sampling of second resistance R2 with the first electric capacity C1's
Isolation operational amplifier IC1 is transferred to after filtering carries out signal amplification.
Wherein, R1 can be replaced by the way of multiple resistor coupled in parallel, R2 can be replaced by the way of multiple resistor coupled in parallel
Change, C1 can be replaced by the way of multiple electric capacity parallel connections.
Ac voltage signal is converted to DC pulse moving voltage signal by ac voltage signal converting unit 11, isolates computing list
Unit 12 is effectively isolated actual test with the reference ground of control chip, antijamming capability enhancing, especially in input
Used in current power factor modulation topology, can solve because the sampling that power component and switch bring influences.
With further reference to Fig. 1, the DC pulse signal modular converter 20 described in the present embodiment includes：
Analog signal converting unit 21, is connected with the signal-isolated transmission module 10, for by signal-isolated transmission mould
The DC pulse moving voltage signal of the transmission of block 10 amplifies and is converted to analog signal；
Data signal converting unit 22, is connected with the analog signal converting unit 21, single for analog signal to be changed
The DC pulse moving voltage signal that unit 21 amplifies is converted to data signal after being compared with reference voltage.
Wherein, with ac voltage signal to be measured there is linear corresponding pass in the analog signal of the conversion of analog signal converting unit 21
The voltage magnitude of corresponding ac voltage signal to be measured is calculated by system, the voltage magnitude for detecting analog signal.Numeral letter
The data signal of number converting unit 22 conversion is used to being transferred to after software data processing module 30 processed, and obtains exchange to be measured
The zero crossing position of voltage signal.
Fig. 3 is visited, the analog signal converting unit 21 described in the present embodiment includes first computing of amplifier IC2
End, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance
R9, the tenth resistance R10, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and the 5th electric capacity C5, the isolation arithmetic element
The negative signal of the DC pulse moving voltage signal of 12 outputs is put via the 3rd resistor R3 and the 5th resistance R5 with described
The second pin of big device IC2 is connected；It is described isolation arithmetic element 12 output DC pulse moving voltage signal positive signal via
The 4th resistance R4 and the 6th resistance R6 are connected with the 3rd pin of the amplifier IC2；The 4th electric capacity C4 connects
It is connected between the first pin of the amplifier and second pin, the 7th resistance R7 is connected to the first of the amplifier and draws
Between pin and second pin；The 3rd electric capacity C3 is connected between the 3rd pin of the amplifier IC2 and the 4th pin；Institute
The 8th resistance R8 is stated to be connected between the 3rd pin of the amplifier IC2 and the 4th pin；One end of the second electric capacity C2
It is connected between the 3rd resistor R3 and the 5th resistance R5, the other end of the second electric capacity C2 is connected to the 4th resistance
Between R4 and the 6th resistance R6, the 4th pin of the amplifier IC2 is connected with reference ground；The 9th resistance R9 is connected to institute
State between the 1st pin of amplifier IC2 and the analog signal of output, the tenth resistance R10 be connected to output analog signal and
Between reference ground, the 5th electric capacity C5 is connected between the analog signal of output and reference ground.
The first computing end of the amplifier IC2 and 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8 composition negative-feedback circuits, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and the 5th
Electric capacity C5 is filtered to DC pulse moving voltage signal, and DC pulse moving voltage signal is after negative-feedback circuit amplification through amplifier
The first pin output at the first computing end of IC2, by the 9th resistance R9, the partial pressure of the tenth resistance R10 and the 5th electric capacity C5
Analog signal is exported after filtering.
In other embodiments, the 5th resistance R5, the 6th resistance R6 and the second electric capacity C2 can also be omitted, in this kind of situation
Under, the 3rd resistor R3 is connected to negative signal and the institute of the DC pulse moving voltage signal of isolation arithmetic element 12 output
State between the second pin of amplifier IC2, the 4th resistance R4 is connected to the direct current arteries and veins of isolation arithmetic element 12 output
Between the positive signal and the 3rd pin of the amplifier IC2 of dynamic voltage signal.
Data signal converting unit 22 described in the present embodiment includes the second computing end, the 11st resistance of amplifier IC2
R11, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the 6th electric capacity C6 and the 7th electric capacity C7, the described 12nd
One end of resistance R12 is connected with supply voltage end (15 volts of voltage), the other end and the 6th of the second computings of amplifier IC2 end
Pin be connected, the 13rd resistance R13 be connected to the second computings of amplifier IC2 end the 6th pin and reference ground it
Between, the 6th electric capacity C6 is connected between the 6th pin at the second computings of amplifier IC2 end and reference ground；Second computing
5th pin at end is connected via the described 14th resistance R14 with first pin at the first computing end, and the amplifier IC2 second is transported
The 5th pin for calculating end is connected via the 7th electric capacity C7 with reference ground；The 11st resistance R11 is connected to the amplifier IC2
Between 5th pin and the 7th pin at the second computing end, the 7th pin output number at the second computing end of the amplifier IC2
Word signal.
The 6th electric capacity C6 and the 7th electric capacity C7 of the signal-isolated transmission module 10 are filtered, the DC pulse of transmission
After reference voltage on voltage signal and the 12nd resistance R12 is compared, put by the second computing end of amplifier IC2
Data signal is converted to after big, in the present embodiment, the data signal is square-wave signal.
Referring to Fig. 1 and Fig. 4, the software data processing module 30 described in the present embodiment includes：
Sampling unit 31, is connected with DC pulse signal modular converter 20, for gathering DC pulse signal modular converter
The high level period signal length [ta] of 20 outputs；
Memory cell 32, for storing parameter value [t_delay], the parameter value is the zero crossing position of ac voltage signal
Put the zero crossing position and the data signal trailing edge that differ the time [tby] and ac voltage signal with data signal rising edge
Difference between the difference time [tbx]；
Computing unit 33, for the high level week that the time [t_vac] according to power supply half period, sampling unit are collected
Phase signal length [ta] and the parameter value [t_delay] of memory cell storage, calculate actual zero crossing position [tb], the reality
Border zero crossing position [tb]=([t_vac]-[ta]-[t_delay])/2.
Software data processing module 30 is illustrated below：
It is as described below by data signal presumption zero crossing position (Z/C) principle：
Actual alternating voltage waveform and poor, this response with hardware module by waveform existence time after hardware module treatment
Speed is relevant with processing mode, and software data processing module 30 is corrected in the data signal for obtaining, and obtains actual friendship
Stream voltage signal zero crossing position.
With further reference to Fig. 4, in software data processing module 30 shown in being described as follows of each difference：
[t_vac]：With the time consistency of power supply half period；
[ta]：The high level period signal length of the output of data signal converting unit 22；If once judging zero crossing
, there is larger time error in position (Z/C).
[tby]：The zero crossing position of ac voltage signal differs the time with detection signal rising edge；
[tbx]：The zero crossing position of ac voltage signal differs the time with detection signal trailing edge.
So, [tby]+[tbx] is the low-level period signal length of the output of data signal converting unit 22, thus may be used
Know,
[t_vac]=[ta]+[tby]+[tbx] formula (1)
Now introduce parameter value [t_delay]=[tby]-[tbx] formula (2)
Wherein, the value of parameter value [t_delay] can detect the reality for entering chip mouthful by testing equipments such as oscillographs
Waveform.[tby], the value of [tbx] are measured, is then calculated using formula (2).
The calculation of software data processing module 30 is described further below：
High-speed sampling [ta] waveform can accurately know the position of [ta] trailing edge, but this position and actual zero crossing position
(Z/C) there is error [tbx].
If [tbx]=[tbx^]+[th1] ... formula (3)
Wherein, [tbx^] is stripped deviation value, and [th1] is the influence that side circuit parameter discrete brings.
If [tby]=[tby^]+[th2] formula (4)
[tby^] is stripped deviation value, and [th2] is the influence that side circuit parameter discrete brings.
According to formula (2)：
[t_delay]=[tby]-[tbx]
=([tbx^]+[th1])-([tby^]+[th2])
=([tby^]-[tbx^])+([th1]-[th2]) formula (5)
In actual test, [th1], the value approximately equal of [th2], ([th1]-[th2]) ≈ 0 when homogeneous is sampled
Thus obtain：
[tb]=([t_vac]-[ta]-[t_delay])/2 formula (6)
(then data signal trailing edge point on a timeline postpone [tb] backward be actual zero crossing position)
By above formula (6), you can calculate the value of zero crossing position, wherein, [t_vac] can according to the frequency of power supply
To calculate analog value, [ta] can be obtained according to sampling unit 31, and [t_delay] parameter value can be examined by oscillograph etc.
Measurement equipment detection enters the actual waveform of chip mouthful.[tby], the value of [tbx] are measured, is then calculated using formula (2).
Knowable to the derivation of above-mentioned formula, because reducing the influence that discrete parameter is brought, so substantially increase adopting
The precision of sample.
The present embodiment furthermore provides a kind of voltage device based on Single-phase PFC, including either circuit described above.
The preferred embodiments of the present invention are these are only, the scope of the claims of the invention is not thereby limited, it is every to utilize this hair
Equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (9)
1. a kind of voltage detecting circuit based on Single-phase PFC, it is characterised in that including signal-isolated transmission module, DC pulse
Signal conversion module and software data processing module, wherein,
The signal-isolated transmission module, for by ac voltage signal be converted to DC pulse moving voltage signal and amplify after transmit
To the DC pulse signal modular converter；
The DC pulse signal modular converter, is connected with the signal-isolated transmission module, for the signal isolation to be passed
The DC pulse moving voltage signal that defeated module transfer comes is converted to analog signal, is allowed to there is linear corresponding pass with ac voltage
System, so as to detect the voltage magnitude of ac voltage signal；It is additionally operable to be compared DC pulse moving voltage signal and reference voltage
After be converted to data signal；
The software data processing module, is connected, for according to DC pulse signal with the DC pulse signal modular converter
The data signal that modular converter is obtained, calculates actual zero crossing position；
Wherein, the DC pulse signal modular converter includes：
Analog signal converting unit, is connected with the signal-isolated transmission module, for by signal-isolated transmission module transfer
DC pulse moving voltage signal amplifies and is converted to analog signal；
Data signal converting unit, is connected with the analog signal converting unit, for amplify analog signal converting unit
DC pulse moving voltage signal is converted to data signal after being compared with reference voltage.
2. the voltage detecting circuit of Single-phase PFC is based on as claimed in claim 1, it is characterised in that the signal-isolated transmission
Module includes：
Ac voltage signal converting unit, for ac voltage signal to be converted into DC pulse moving voltage signal；
Isolation arithmetic element, is connected with the ac voltage signal converting unit, single for the ac voltage signal to be changed
The DC pulse moving voltage signal of unit's conversion is transferred to DC pulse signal modular converter after being amplified.
3. the voltage detecting circuit of Single-phase PFC is based on as claimed in claim 2, it is characterised in that the ac voltage signal
Converting unit includes first resistor and rectifier bridge, and an ac input end of the rectifier bridge is connected with the L ends of ac voltage signal,
Another ac input end of the rectifier bridge is connected via the first resistor with the N-terminal of ac voltage signal.
4. the voltage detecting circuit of Single-phase PFC is based on as claimed in claim 3, it is characterised in that the isolation arithmetic element,
It is connected with the ac voltage signal converting unit, including second resistance, the first electric capacity and isolation operational amplifier, wherein,
3rd pin and the 5th pin of the isolation operational amplifier as the isolation arithmetic element input, described the
Two resistance are connected between the 3rd pin of the isolation operational amplifier and the 5th pin, and first capacitance connection is in described
Isolate operational amplifier the 3rd pin and the 5th pin between, it is described isolation operational amplifier the 3rd pin and the rectification
The direct-flow positive pole output end of bridge is connected, the 5th pin of the isolation operational amplifier, the 7th pin and the rectifier bridge it is straight
Stream cathode output end is connected with actual test ground, and the first pin of the isolation operational amplifier is connected with the first power supply,
8th pin of the isolation operational amplifier is connected with reference ground, the 14th pin and second of the isolation operational amplifier
Power supply is connected；Tenth pin and the 12nd pin of the isolation operational amplifier are used as the defeated of the isolation arithmetic element
Go out end, the tenth pin of the isolation operational amplifier exports the negative signal of DC pulse moving voltage signal, the isolation computing
12nd pin of amplifier exports the positive signal of DC pulse moving voltage signal.
5. the voltage detecting circuit of Single-phase PFC is based on as claimed in claim 1, it is characterised in that the analog signal conversion
Unit includes the first computing end, 3rd resistor, the 4th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth of amplifier
Resistance, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity, wherein,
First pin of the first computing end of the amplifier including the amplifier, second pin, the 3rd pin, the 4th draw
Pin, the 3rd pin of the amplifier as the analog signal converting unit electrode input end, the second of the amplifier
Pin as the analog signal converting unit negative input, the first pin of the amplifier is used as the analog signal
The output end of converting unit, the 4th pin of the amplifier is connected with reference ground；The 3rd resistor is connected to the isolation
Between the negative signal of DC pulse moving voltage signal and the second pin of the amplifier of arithmetic element output；4th electricity
Resistance is connected to the positive signal of DC pulse moving voltage signal of the isolation arithmetic element output and the 3rd of the amplifier draws
Between pin；Between first pin and second pin of the amplifier, the 7th resistance is connected 4th capacitance connection
Between first pin and second pin of the amplifier；3rd capacitance connection in the amplifier the 3rd pin and
Between 4th pin；3rd capacitance connection is between the 3rd pin of the amplifier and the 4th pin, and the described 8th is electric
Resistance is connected between the 3rd pin of the amplifier and the 4th pin, and the 9th resistance is connected to the first of the amplifier
Between pin and the analog signal of output, the tenth resistance is connected between the analog signal of output and reference ground, and described
Five capacitance connections are between the analog signal and reference ground of output.
6. the voltage detecting circuit of Single-phase PFC is based on as claimed in claim 5, it is characterised in that the analog signal conversion
Unit also includes the 5th resistance, the 6th resistance and the second electric capacity, and described 5th resistance one end is connected with the 3rd resistor, described
The other end of the 5th resistance is connected with the second pin of the amplifier；One end of 6th resistance and the 4th resistance phase
Even, the other end of the 6th resistance is connected with the 3rd pin of the amplifier；One end of second electric capacity is connected to institute
State between 3rd resistor and the 5th resistance, the other end of second electric capacity be connected to the 4th resistance and the 6th resistance it
Between.
7. the voltage detecting circuit of Single-phase PFC is based on as claimed in claim 5, it is characterised in that the data signal conversion
Unit includes the second computing end, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 6th electric capacity of amplifier
With the 7th electric capacity, wherein,
Fiveth pin of the second computing end of the amplifier including the amplifier, the 6th pin, the 7th pin, the 8th draw
Pin, the 5th pin of the amplifier as the data signal converting unit electrode input end, the 6th of the amplifier the
Pin as the data signal converting unit negative input, the 7th pin of the amplifier is used as the data signal
The output end of converting unit, the 8th pin of the amplifier is connected with supply voltage end；The 5th pin warp of the amplifier
The DC pulse moving voltage signal amplified with the analog signal converting unit by the 14th resistance is connected, the 12nd electricity
One end of resistance is connected with supply voltage end, and the other end of the 12nd resistance is connected with the 6th pin of the amplifier；Institute
The 6th capacitance connection is stated between the 6th pin and reference ground of the amplifier；13rd resistance is connected to the amplification
Between 6th pin and reference ground of device；5th pin of the amplifier is connected via the 7th electric capacity with reference ground；Institute
State the 11st resistance to be connected between the 5th pin of the amplifier and the 7th pin, the 7th pin output of the amplifier
Data signal.
8. the voltage detecting circuit of Single-phase PFC is based on as claimed in claim 1, it is characterised in that the software data treatment
Module includes：
Sampling unit, is connected with DC pulse signal modular converter, the height for gathering the output of DC pulse signal modular converter
Level period signal length [ta]；
Memory cell, for storing parameter value [t_delay], zero crossing position and number of the parameter value for ac voltage signal
The difference time [tby] of word signal rising edge and the zero crossing position of ac voltage signal are with data signal trailing edge when differing
Between difference between [tbx]；
Computing unit, for the high level period signal that the time [t_vac] according to power supply half period, sampling unit are collected
Length [ta] and the parameter value [t_delay] of memory cell storage, calculate actual zero crossing position [tb], the actual zero passage
Point position [tb]=([t_vac]-[ta]-[t_delay])/2.
9. a kind of voltage check device based on Single-phase PFC, it is characterised in that including the electricity described in any one of claim 1 to 8
Road.
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| CN106230250B (en) * | 2016-08-25 | 2019-05-24 | 山东神州电炉有限公司 | The method of frequency SCR in a kind of driving of passive type PGC demodulation |
| WO2018176184A1 (en) * | 2017-03-25 | 2018-10-04 | 深圳欣锐科技股份有限公司 | Input voltage signal sampling circuit in three-phase three-wire system pfc circuit |
| CN109900954A (en) * | 2017-12-11 | 2019-06-18 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its voltage sampling method, device |
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