CN103954828A - Voltage detection circuit and device based on single-phase PFC - Google Patents
Voltage detection circuit and device based on single-phase PFC Download PDFInfo
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Abstract
The invention discloses a voltage detection circuit based on a single-phase PFC. The circuit comprises a signal isolation and transmission module, a direct-current pulsant signal conversion module and a software data processing module, wherein the signal isolation and transmission module is used for converting alternating-current voltage signals into direct-current pulsant voltage signals, and the direct-current pulsant signal conversion module is used for converting the direct-current pulsant voltage signals into analog signals, so that the linear corresponding relation exists between the analog signals and the alternating-current direct-voltage value, and therefore voltage amplitude of an alternating-current voltage signal is detected. The direct-current pulsant signal conversion module is also used for comparing the direct-current pulsant voltage signals with reference voltages and converting the voltage signals into digital signals, and the software data processing module is used for calculating the zero crossing point position according to the digital signals transmitted by the direct-current pulsant signal conversion module. The invention further provides a voltage detection device based on the single-phase PFC. The voltage detection circuit is simple in structure, high in stability, strong in anti-jamming capability and high in detection precision.
Description
Technical field
The present invention relates to PFC (Power Factor Correction power factor correction) detection field, relate in particular to voltage detecting circuit and device based on Single-phase PFC.
Background technology
In Single-phase PFC control circuit, often need the zero crossing of AC input voltage and amplitude to detect accurately, but the existence due to energy-storage travelling wave tube inductance and on-off element in the BOOST booster circuit of PFC, cause traditional non-isolated voltage detecting mode no longer applicable, how avoiding the impact that Single-phase PFC circuit power device and switch cause non-isolation sample mode and the precision that improves test, is our problem demanding prompt solution.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of voltage detecting circuit based on Single-phase PFC, is intended to solve the impact that Single-phase PFC circuit power device and switch cause non-isolation sample mode and the problem that improves measuring accuracy.
For achieving the above object, a kind of voltage detecting circuit based on Single-phase PFC provided by the invention, comprises signal isolated transmission module, DC pulse signal modular converter and software data processing module, wherein,
Described signal isolated transmission module is transferred to described DC pulse signal modular converter after ac voltage signal being converted to DC pulse moving voltage signal amplification;
Described DC pulse signal modular converter, be connected with described signal isolated transmission module, for the DC pulse moving voltage signal that described signal isolated transmission module is transmitted, be converted to simulating signal, make it to have linear corresponding relation with ac voltage, thereby detect the voltage magnitude of ac voltage signal; Also after being compared, DC pulse moving voltage signal and reference voltage be converted to digital signal;
Described software data processing module, is connected with described DC pulse signal modular converter, for the digital signal obtaining according to DC pulse signal modular converter, calculates actual zero crossing position.
Preferably, described signal isolated transmission module comprises:
Ac voltage signal converting unit, for being converted to ac voltage signal DC pulse moving voltage signal;
Isolation arithmetic element, is connected with described ac voltage signal converting unit, after the DC pulse moving voltage signal of described ac voltage signal converting unit conversion is amplified, is transferred to DC pulse signal modular converter.
Preferably, described ac voltage signal converting unit comprises the first resistance and rectifier bridge, one ac input end of described rectifier bridge is connected with the L of ac voltage signal end, and another ac input end of described rectifier bridge is connected with the N end of ac voltage signal via described the first resistance.
Preferably, described isolation arithmetic element, is connected with described ac voltage signal converting unit, comprises the second resistance, the first electric capacity and isolation operational amplifier, wherein,
The 3rd pin of described isolation operational amplifier and the 5th pin are as the input end of described isolation arithmetic element, described the second resistance is connected between the 3rd pin and the 5th pin of described isolation operational amplifier, described the first electric capacity is connected between the 3rd pin and the 5th pin of described isolation operational amplifier, the 3rd pin of described isolation operational amplifier is connected with the direct-flow positive pole output terminal of described rectifier bridge, the 5th pin of described isolation operational amplifier, the direct current cathode output end of the 7th pin and described rectifier bridge is tested and is connected with reality, the first pin of described isolation operational amplifier is connected with the first power supply, the 8th pin of described isolation operational amplifier with reference to be connected, the 14 pin of described isolation operational amplifier is connected with the second power supply, the tenth pin of described isolation operational amplifier and the 12 pin are as the output terminal of described isolation arithmetic element, the negative signal of the tenth pin output DC pulse moving voltage signal of described isolation operational amplifier, the positive signal of the 12 pin output DC pulse moving voltage signal of described isolation operational amplifier.
Preferably, described DC pulse signal modular converter comprises:
Simulating signal converting unit, is connected with described signal isolated transmission module, for the DC pulse moving voltage signal of signal isolated transmission module transmission being amplified and being converted to simulating signal;
Digital signal converting unit, is connected with described simulating signal converting unit, after comparing, is converted to digital signal for DC pulse moving voltage signal that simulating signal converting unit is amplified and reference voltage.
Preferably, described simulating signal converting unit comprises the first computing end, the 3rd resistance, the 4th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity of amplifier, wherein,
The first computing end of described amplifier comprises the first pin, the second pin, the 3rd pin, the 4th pin of described amplifier, the 3rd pin of described amplifier is as the electrode input end of described simulating signal converting unit, the second pin of described amplifier is as the negative input of described simulating signal converting unit, the first pin of described amplifier is as the output terminal of described simulating signal converting unit, the 4th pin of described amplifier with reference to be connected; Described the 3rd resistance is connected between the negative signal of DC pulse moving voltage signal and the second pin of described amplifier of described isolation arithmetic element output; Described the 4th resistance is connected between the positive signal of DC pulse moving voltage signal and the 3rd pin of described amplifier of described isolation arithmetic element output; Described the 4th electric capacity is connected between first pin and the second pin of described amplifier, and described the 7th resistance is connected between first pin and the second pin of described amplifier; Described the 3rd electric capacity is connected between the 3rd pin and the 4th pin of described amplifier; Described the 3rd electric capacity is connected between the 3rd pin and the 4th pin of described amplifier, described the 8th resistance is connected between the 3rd pin and the 4th pin of described amplifier, described the 9th resistance is connected between first pin and the simulating signal of output of described amplifier, described the tenth resistance is connected in the simulating signal of output and with reference between ground, and described the 5th electric capacity is connected in the simulating signal of output and with reference between ground.
Preferably, described simulating signal converting unit also comprises the 5th resistance, the 6th resistance and the second electric capacity, and described the 5th resistance one end is connected with described the 3rd resistance, and the other end of described the 5th resistance is connected with the second pin of described amplifier; One end of described the 6th resistance is connected with described the 4th resistance, and the other end of described the 6th resistance is connected with the 3rd pin of described amplifier; One end of described the second electric capacity is connected between described the 3rd resistance and the 5th resistance, and the other end of described the second electric capacity is connected between described the 4th resistance and the 6th resistance.
Preferably, described digital signal converting unit comprises the second computing end, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 6th electric capacity and the 7th electric capacity of amplifier, wherein,
The second computing end of described amplifier comprises the 5th pin, the 6th pin, the 7th pin, the 8th pin of described amplifier, the 5th pin of described amplifier is as the electrode input end of described digital signal converting unit, the 6th pin of described amplifier is as the negative input of described digital signal converting unit, the 7th pin of described amplifier is as the output terminal of described digital signal converting unit, and the 8th pin of described amplifier is connected with supply voltage end; The DC pulse moving voltage signal that the 5th pin of described amplifier amplifies with described simulating signal converting unit via described the 14 resistance is connected, one end of described the 12 resistance is connected with supply voltage end, and the other end of described the 12 resistance is connected with the 6th pin of described amplifier; Described the 6th electric capacity is connected in the 6th pin of described amplifier and with reference between ground; Described the 13 resistance is connected in the 6th pin of described amplifier and with reference between ground; The 5th pin of described amplifier via described the 7th electric capacity with reference to be connected; Described the 11 resistance is connected between the 5th pin and the 7th pin of described amplifier, the 7th pin output digit signals of described amplifier.
Preferably, described software data processing module comprises:
Sampling unit, is connected with DC pulse signal modular converter, for gathering the high level period signal length [ta] of DC pulse signal modular converter output;
Storage unit, for stored parameter value [t_delay], the zero crossing position that differs the time [tby] and ac voltage signal of the zero crossing position that described parameter value is ac voltage signal and digital signal rising edge and digital signal negative edge differ the time difference between [tbx];
Computing unit, for the high level period signal length [ta] that collects according to the time of power supply half period [t_vac], sampling unit and the parameter value [t_delay] of cell stores, calculate actual zero crossing position [tb], described actual zero crossing position [tb]=([t_vac]-[ta]-[t_delay])/2.
Further described a kind of voltage check device based on Single-phase PFC, comprises described circuit.
A kind of voltage detecting circuit based on Single-phase PFC of the present invention, comprise signal isolated transmission module, DC pulse signal modular converter and software data processing module, wherein, described signal isolated transmission module is transferred to described DC pulse signal modular converter after ac voltage signal being converted to DC pulse moving voltage signal amplification; Described DC pulse signal modular converter, be connected with described signal isolated transmission module, for the DC pulse moving voltage signal that described signal isolated transmission module is transmitted, be converted to simulating signal, make it to have linear corresponding relation with exchanging vertical compression value, thereby detect the voltage magnitude of ac voltage signal; Also after being compared, DC pulse moving voltage signal and reference voltage be converted to digital signal; Described software data processing module, is connected with described DC pulse signal modular converter, for the digital signal obtaining according to DC pulse signal modular converter, calculates actual zero crossing position.Achieved beneficial effect is: the voltage detecting circuit that the present invention is based on Single-phase PFC, adopt isolation sampling plan that reality is tested and effectively isolated with the reference ground of control chip, antijamming capability is strong, especially in input current power factor modulation topology, use, can solve the sampling impact bringing due to power component and switch; DC pulse processing section, is used the integrated circuit of two amplifiers of encapsulation general on market, makes the circuit simplification that becomes, and stability is high; When detecting zero crossing, introduce parameter value [t_delay], by exclusive algorithm, effectively balanced out the impact that hardware circuit brings, improved accuracy of detection.
Accompanying drawing explanation
Fig. 1 is the structured flowchart that the present invention is based on voltage detecting circuit one embodiment of 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 that the signal of software data processing module in Fig. 1 is processed schematic diagram.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The invention provides a kind of voltage detecting circuit based on Single-phase PFC, with reference to Fig. 1, in the present embodiment, this circuit comprises signal isolated transmission module 10, DC pulse signal modular converter 20 and software data processing module 30, wherein,
Described signal isolated transmission module 10 is transferred to described DC pulse signal modular converter 20 after ac voltage signal being converted to DC pulse moving voltage signal amplification;
Signal isolated transmission module 10 is converted to DC pulse moving voltage signal by ac voltage signal, reality is tested and effectively isolated with the reference ground of control chip, antijamming capability strengthens, especially in input current power factor modulation topology, use, can solve the sampling impact bringing due to power component and switch.
Described DC pulse signal modular converter 20, be connected with described signal isolated transmission module 10, for the DC pulse moving voltage signal that described signal isolated transmission module 10 is transmitted, be converted to simulating signal, make it to have linear corresponding relation with exchanging vertical compression value, thereby detect the voltage magnitude of ac voltage signal; Also after being compared, DC pulse moving voltage signal and reference voltage be converted to digital signal;
The DC pulse processing section of described DC pulse signal modular converter 20, is used the integrated circuit of two amplifiers of encapsulation general on market, makes circuit simplifications that become, stability raising.
Described software data processing module 30, is connected with described DC pulse signal modular converter 20, for the digital signal obtaining according to DC pulse signal modular converter 20, calculates actual zero crossing position.
Described software data processing module 30 is introduced parameter value [t_delay] when detecting zero crossing, by exclusive algorithm, has effectively balanced out the impact that hardware circuit brings, and has improved accuracy of detection.
In sum, a kind of voltage detecting circuit based on Single-phase PFC of the present embodiment, comprise signal isolated transmission module 10, DC pulse signal modular converter 20 and software data processing module 30, wherein, described signal isolated transmission module 10 is transferred to described DC pulse signal modular converter 20 after ac voltage signal being converted to DC pulse moving voltage signal amplification; Described DC pulse signal modular converter 20, be connected with described signal isolated transmission module 10, for the DC pulse moving voltage signal that described signal isolated transmission module 10 is transmitted, be converted to simulating signal, make it to have linear corresponding relation with exchanging vertical compression value, thereby detect the voltage magnitude of ac voltage signal; Also after being compared, DC pulse moving voltage signal and reference voltage be converted to digital signal; Described software data processing module 30, is connected with described DC pulse signal modular converter 20, for the digital signal obtaining according to DC pulse signal modular converter 20, calculates actual zero crossing position.Achieved beneficial effect is: the voltage detecting circuit that the present invention is based on Single-phase PFC, adopt isolation sampling plan that reality is tested and effectively isolated with the reference ground of control chip, antijamming capability is strong, especially in input current power factor modulation topology, use, can solve the sampling impact bringing due to power component and switch; DC pulse processing section, is used the integrated circuit of two amplifiers of encapsulation general on market, makes the circuit simplification that becomes, and stability is high; When detecting zero crossing, introduce parameter value [t_delay], by exclusive algorithm, effectively balanced out the impact that hardware circuit brings, improved accuracy of detection.
Particularly, with further reference to Fig. 1, signal isolated transmission module 10 comprises described in the present embodiment:
Ac voltage signal converting unit 11, for being converted to ac voltage signal DC pulse moving voltage signal;
Isolation arithmetic element 12, is connected with described ac voltage signal converting unit 11, after the DC pulse moving voltage signal of described ac voltage signal converting unit 11 conversions is amplified, is transferred to DC pulse signal modular converter 20.
Referring to Fig. 2, ac voltage signal converting unit 11 described in the present embodiment comprises the first resistance R 1 and rectifier bridge DB1, an ac input end of described rectifier bridge DB1 is connected with the L of AC power end, another ac input end of described rectifier bridge DB1 is connected via the N end of described the first resistance R 1 and AC power, ac voltage signal through the shunting pressure limiting of described the first resistance R 1 by being converted to DC pulse moving voltage signal by described rectifier bridge DB1.
Described isolation arithmetic element 12 described in the present embodiment, is connected with described ac voltage signal converting unit 11, comprises the second resistance R 2, the first capacitor C 1 and isolation operational amplifier DB1, wherein,
The 3rd pin of described isolation operational amplifier IC1 and the 5th pin are as the input end of described isolation arithmetic element 12, described the second resistance R 2 is connected between the 3rd pin and the 5th pin of described isolation operational amplifier IC1, described the first capacitor C 1 is connected between the 3rd pin and the 5th pin of described isolation operational amplifier DB1, the 3rd pin of described isolation operational amplifier IC1 is connected with the direct-flow positive pole output terminal of described rectifier bridge DB1, the 5th pin of described isolation operational amplifier IC1, the direct current cathode output end of the 7th pin and described rectifier bridge DB1 is tested and is connected with reality, the first pin of described isolation operational amplifier IC1 is connected with the first power supply, the 8th pin of described isolation operational amplifier IC1 with reference to be connected, the 14 pin of described isolation operational amplifier IC1 is connected with the second power supply, the tenth pin of described isolation operational amplifier IC1 and the 12 pin are as the output terminal of described isolation arithmetic element 12, the negative signal of the tenth pin output DC pulse moving voltage signal of described isolation operational amplifier IC1, the positive signal of the 12 pin output DC pulse moving voltage signal of described isolation operational amplifier IC1.DC pulse moving voltage signal is transferred to isolation operational amplifier IC1 after via the sampling of the second resistance R 2 and the filtering of the first capacitor C 1 and carries out signal amplification.
Wherein, R1 can adopt that the mode of a plurality of resistance parallel connections is replaced, R2 can adopt that the mode of a plurality of resistance parallel connections is replaced, C1 can adopt the mode of a plurality of Capacitance parallel connections to replace.
Ac voltage signal converting unit 11 is converted to DC pulse moving voltage signal by ac voltage signal, isolation arithmetic element 12 is tested reality effectively to isolate with the reference ground of control chip, antijamming capability strengthens, especially in input current power factor modulation topology, use, can solve the sampling impact bringing due to power component and switch.
With further reference to Fig. 1, the DC pulse signal modular converter 20 described in the present embodiment comprises:
Simulating signal converting unit 21, is connected with described signal isolated transmission module 10, for the DC pulse moving voltage signal of signal isolated transmission module 10 transmission being amplified and being converted to simulating signal;
Digital signal converting unit 22, is connected with described simulating signal converting unit 21, after comparing, is converted to digital signal for DC pulse moving voltage signal that simulating signal converting unit 21 is amplified and reference voltage.
Wherein, there is linear corresponding relation in simulating signal and the ac voltage signal to be measured of 21 conversions of simulating signal converting unit, and the voltage magnitude that detects simulating signal can calculate the voltage magnitude of corresponding ac voltage signal to be measured.The digital signal of digital signal converting unit 22 conversion is used for being transferred to software data processing module 30 process after, obtain the zero crossing position of ac voltage signal to be measured.
Visit Fig. 3, described simulating signal converting unit 21 described in the present embodiment comprises the first computing end, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4 and the 5th capacitor C 5 of amplifier IC2, and the negative signal of the DC pulse moving voltage signal of described isolation arithmetic element 12 outputs is connected with the second pin of described amplifier IC2 with described the 5th resistance R 5 via described the 3rd resistance R 3; The positive signal of the DC pulse moving voltage signal of described isolation arithmetic element 12 outputs is connected with the 3rd pin of described amplifier IC2 with described the 6th resistance R 6 via described the 4th resistance R 4; Described the 4th capacitor C 4 is connected between first pin and the second pin of described amplifier, and described the 7th resistance R 7 is connected between first pin and the second pin of described amplifier; Described the 3rd capacitor C 3 is connected between the 3rd pin and the 4th pin of described amplifier IC2; Described the 8th resistance R 8 is connected between the 3rd pin and the 4th pin of described amplifier IC2; One end of described the second capacitor C 2 is connected between described the 3rd resistance R 3 and the 5th resistance R 5, and the other end of described the second capacitor C 2 is connected between described the 4th resistance R 4 and the 6th resistance R 6, the 4th pin of described amplifier IC2 with reference to be connected; Described the 9th resistance R 9 is connected between the 1st pin and the simulating signal of output of described amplifier IC2, and described the tenth resistance R 10 is connected in the simulating signal of output and with reference between ground, and described the 5th capacitor C 5 is connected in the simulating signal of output and with reference between ground.
The first computing end of described amplifier IC2 and the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 form negative-feedback circuit, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4 and 5 pairs of DC pulse moving voltage signals of the 5th capacitor C carry out filtering, DC pulse moving voltage signal amplifies the first pin output by the first computing end of amplifier IC2 through negative-feedback circuit, by outputting analog signal after the 9th resistance R 9, the dividing potential drop of the tenth resistance R 10 and the filtering of the 5th capacitor C 5.
In other embodiments, the 5th resistance R 5, the 6th resistance R 6 and the second capacitor C 2 also can be omitted, in such cases, described the 3rd resistance R 3 is connected between the negative signal of DC pulse moving voltage signal and the second pin of described amplifier IC2 of described isolation arithmetic element 12 outputs, described the 4th resistance R 4 is connected between the positive signal of DC pulse moving voltage signal and the 3rd pin of described amplifier IC2 of described isolation arithmetic element 12 outputs.
Digital signal converting unit 22 described in the present embodiment comprises the second computing end of amplifier IC2, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R13, the 14 resistance R 14, the 6th capacitor C 6 and the 7th capacitor C 7, one end of described the 12 resistance R 12 is connected with supply voltage end (15 volts of voltage), the other end is connected with the 6th pin of described amplifier IC2 the second computing end, described the 13 resistance R 13 is connected in the 6th pin of described amplifier IC2 the second computing end and with reference between ground, the 6th capacitor C 6 is connected in the 6th pin of described amplifier IC2 the second computing end and with reference between ground, the 5th pin of described the second computing end via described the 14 resistance R14 be connected with the first pin of the first computing end, the 5th pin of described amplifier IC2 the second computing end via the 7th capacitor C 7 with reference be connected, described the 11 resistance R 11 is connected between the 5th pin and the 7th pin of described amplifier IC2 the second computing end, the 7th pin output digit signals of the second computing end of described amplifier IC2.
The 6th capacitor C 6 of described signal isolated transmission module 10 and the 7th capacitor C 7 are carried out filtering, after the DC pulse moving voltage signal of transmission and the reference voltage in the 12 resistance R 12 compare, after amplifying, the second computing end by amplifier IC2 is converted to digital signal, in the present embodiment, described digital signal is square-wave signal.
Referring to Fig. 1 and Fig. 4, the software data processing module 30 described in the present embodiment comprises:
Sampling unit 31, is connected with DC pulse signal modular converter 20, for gathering the high level period signal length [ta] of DC pulse signal modular converter 20 outputs;
Storage unit 32, for stored parameter value [t_delay], the zero crossing position that differs the time [tby] and ac voltage signal of the zero crossing position that described parameter value is ac voltage signal and digital signal rising edge and digital signal negative edge differ the time difference between [tbx];
Computing unit 33, for the high level period signal length [ta] that collects according to the time of power supply half period [t_vac], sampling unit and the parameter value [t_delay] of cell stores, calculate actual zero crossing position [tb], described actual zero crossing position [tb]=([t_vac]-[ta]-[t_delay])/2.
Below software data processing module 30 is described:
By digital signal, infer zero crossing position (Z/C) principle as described below:
Actual alternating voltage waveform is poor with waveform life period after hardware module is processed, this is relevant with response speed and the processing mode of hardware module, software data processing module 30 is revised in the digital signal obtaining, and obtains actual ac 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 digital signal converting unit 22 outputs; If once judge zero crossing position (Z/C), there is larger time error.
[tby]: the zero crossing position of ac voltage signal and differing the time of detection signal rising edge;
[tbx]: the zero crossing position of ac voltage signal and differing the time of detection signal negative edge.
So, [tby]+[tbx] is the low-level period signal length of digital signal converting unit 22 outputs, and hence one can see that,
[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 actual waveform that enters chip mouth by checkout equipments such as oscillographs.Record the value of [tby], [tbx], then utilize formula (2) to calculate.
Below software data processing module 30 account forms are described further:
High-speed sampling [ta] waveform can accurately be known the position of [ta] negative edge, but this position and actual zero crossing position (Z/C) exist error [tbx].
[if tbx]=[tbx^]+[th1] ... formula (3)
Wherein, [tbx^] is stripped deviation value, the impact that [th1] brings for side circuit parameter discrete.
[if tby]=[tby^]+[th2] formula (4)
[tby^] is stripped deviation value, the impact that [th2] brings for side circuit parameter discrete.
According to formula (2):
[t_delay]＝[tby]-[tbx]
＝([tbx^]+[th1])-([tby^]+[th2])
=([tby^]-[tbx^])+([th1]-[th2]) formula (5)
In reality test, the value approximately equal of [th1], [th2] during homogeneous sampling, ([th1]-[th2]) ≈ 0 obtains thus:
[tb]=([t_vac]-[ta]-[t_delay])/2 formula (6)
(the point of digital signal negative edge on time shaft postpone backward [tb] be actual zero crossing position)
By formula (6) above, can calculate the value of zero crossing position, wherein, [t_vac] can calculate analog value according to the frequency of power supply, [ta] can obtain according to sampling unit 31, and [t_delay] parameter value can detect the actual waveform that enters chip mouth by checkout equipments such as oscillographs.Record the value of [tby], [tbx], then utilize formula (2) to calculate.
From the derivation of above-mentioned formula, because having reduced the impact that discrete parameter is brought, so greatly improved the precision of sampling.
The present embodiment also further provides a kind of voltage device based on Single-phase PFC, comprises arbitrary circuit described above.
These are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; 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 invention.
Claims (10)
1. the voltage detecting circuit based on Single-phase PFC, is characterized in that, comprises signal isolated transmission module, DC pulse signal modular converter and software data processing module, wherein,
Described signal isolated transmission module is transferred to described DC pulse signal modular converter after ac voltage signal being converted to DC pulse moving voltage signal amplification;
Described DC pulse signal modular converter, be connected with described signal isolated transmission module, for the DC pulse moving voltage signal that described signal isolated transmission module is transmitted, be converted to simulating signal, make it to have linear corresponding relation with exchanging vertical compression value, thereby detect the voltage magnitude of ac voltage signal; Also after being compared, DC pulse moving voltage signal and reference voltage be converted to digital signal;
Described software data processing module, is connected with described DC pulse signal modular converter, for the digital signal obtaining according to DC pulse signal modular converter, calculates actual zero crossing position.
2. the voltage detecting circuit based on Single-phase PFC as claimed in claim 1, is characterized in that, described signal isolated transmission module comprises:
Ac voltage signal converting unit, for being converted to ac voltage signal DC pulse moving voltage signal;
Isolation arithmetic element, is connected with described ac voltage signal converting unit, after the DC pulse moving voltage signal of described ac voltage signal converting unit conversion is amplified, is transferred to DC pulse signal modular converter.
3. the voltage detecting circuit based on Single-phase PFC as claimed in claim 2, it is characterized in that, described ac voltage signal converting unit comprises the first resistance and rectifier bridge, one ac input end of described rectifier bridge is connected with the L of ac voltage signal end, and another ac input end of described rectifier bridge is connected with the N end of ac voltage signal via described the first resistance.
4. the voltage detecting circuit based on Single-phase PFC as claimed in claim 3, is characterized in that, described isolation arithmetic element is connected with described ac voltage signal converting unit, comprises the second resistance, the first electric capacity and isolation operational amplifier, wherein,
The 3rd pin of described isolation operational amplifier and the 5th pin are as the input end of described isolation arithmetic element, described the second resistance is connected between the 3rd pin and the 5th pin of described isolation operational amplifier, described the first electric capacity is connected between the 3rd pin and the 5th pin of described isolation operational amplifier, the 3rd pin of described isolation operational amplifier is connected with the direct-flow positive pole output terminal of described rectifier bridge, the 5th pin of described isolation operational amplifier, the direct current cathode output end of the 7th pin and described rectifier bridge is tested and is connected with reality, the first pin of described isolation operational amplifier is connected with the first power supply, the 8th pin of described isolation operational amplifier with reference to be connected, the 14 pin of described isolation operational amplifier is connected with the second power supply, the tenth pin of described isolation operational amplifier and the 12 pin are as the output terminal of described isolation arithmetic element, the negative signal of the tenth pin output DC pulse moving voltage signal of described isolation operational amplifier, the positive signal of the 12 pin output DC pulse moving voltage signal of described isolation operational amplifier.
5. the voltage detecting circuit based on Single-phase PFC as described in claim 1 to 4 any one, is characterized in that, described DC pulse signal modular converter comprises:
Simulating signal converting unit, is connected with described signal isolated transmission module, for the DC pulse moving voltage signal of signal isolated transmission module transmission being amplified and being converted to simulating signal;
Digital signal converting unit, is connected with described simulating signal converting unit, after comparing, is converted to digital signal for DC pulse moving voltage signal that simulating signal converting unit is amplified and reference voltage.
6. the voltage detecting circuit based on Single-phase PFC as claimed in claim 5, it is characterized in that, described simulating signal converting unit comprises the first computing end, the 3rd resistance, the 4th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity of amplifier, wherein
The first computing end of described amplifier comprises the first pin, the second pin, the 3rd pin, the 4th pin of described amplifier, the 3rd pin of described amplifier is as the electrode input end of described simulating signal converting unit, the second pin of described amplifier is as the negative input of described simulating signal converting unit, the first pin of described amplifier is as the output terminal of described simulating signal converting unit, the 4th pin of described amplifier with reference to be connected; Described the 3rd resistance is connected between the negative signal of DC pulse moving voltage signal and the second pin of described amplifier of described isolation arithmetic element output; Described the 4th resistance is connected between the positive signal of DC pulse moving voltage signal and the 3rd pin of described amplifier of described isolation arithmetic element output; Described the 4th electric capacity is connected between first pin and the second pin of described amplifier, and described the 7th resistance is connected between first pin and the second pin of described amplifier; Described the 3rd electric capacity is connected between the 3rd pin and the 4th pin of described amplifier; Described the 3rd electric capacity is connected between the 3rd pin and the 4th pin of described amplifier, described the 8th resistance is connected between the 3rd pin and the 4th pin of described amplifier, described the 9th resistance is connected between first pin and the simulating signal of output of described amplifier, described the tenth resistance is connected in the simulating signal of output and with reference between ground, and described the 5th electric capacity is connected in the simulating signal of output and with reference between ground.
7. the voltage detecting circuit based on Single-phase PFC as claimed in claim 6, it is characterized in that, described simulating signal converting unit also comprises the 5th resistance, the 6th resistance and the second electric capacity, described the 5th resistance one end is connected with described the 3rd resistance, and the other end of described the 5th resistance is connected with the second pin of described amplifier; One end of described the 6th resistance is connected with described the 4th resistance, and the other end of described the 6th resistance is connected with the 3rd pin of described amplifier; One end of described the second electric capacity is connected between described the 3rd resistance and the 5th resistance, and the other end of described the second electric capacity is connected between described the 4th resistance and the 6th resistance.
8. the voltage detecting circuit based on Single-phase PFC as claimed in claim 6, it is characterized in that, described digital signal converting unit comprises the second computing end, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 6th electric capacity and the 7th electric capacity of amplifier, wherein
The second computing end of described amplifier comprises the 5th pin, the 6th pin, the 7th pin, the 8th pin of described amplifier, the 5th pin of described amplifier is as the electrode input end of described digital signal converting unit, the 6th pin of described amplifier is as the negative input of described digital signal converting unit, the 7th pin of described amplifier is as the output terminal of described digital signal converting unit, and the 8th pin of described amplifier is connected with supply voltage end; The DC pulse moving voltage signal that the 5th pin of described amplifier amplifies with described simulating signal converting unit via described the 14 resistance is connected, one end of described the 12 resistance is connected with supply voltage end, and the other end of described the 12 resistance is connected with the 6th pin of described amplifier; Described the 6th electric capacity is connected in the 6th pin of described amplifier and with reference between ground; Described the 13 resistance is connected in the 6th pin of described amplifier and with reference between ground; The 5th pin of described amplifier via described the 7th electric capacity with reference to be connected; Described the 11 resistance is connected between the 5th pin and the 7th pin of described amplifier, the 7th pin output digit signals of described amplifier.
9. the voltage detecting circuit based on Single-phase PFC as claimed in claim 1, is characterized in that, described software data processing module comprises:
Sampling unit, is connected with DC pulse signal modular converter, for gathering the high level period signal length [ta] of DC pulse signal modular converter output;
Storage unit, for stored parameter value [t_delay], the zero crossing position that differs the time [tby] and ac voltage signal of the zero crossing position that described parameter value is ac voltage signal and digital signal rising edge and digital signal negative edge differ the time difference between [tbx];
Computing unit, for the high level period signal length [ta] that collects according to the time of power supply half period [t_vac], sampling unit and the parameter value [t_delay] of cell stores, calculate actual zero crossing position [tb], described actual zero crossing position [tb]=([t_vac]-[ta]-[t_delay])/2.
10. the voltage check device based on Single-phase PFC, is characterized in that, comprises the circuit described in claim 1 to 9 any one.
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| CN201410186974.3A CN103954828B (en) | 2014-05-05 | 2014-05-05 | Voltage detecting circuit and device based on Single-phase PFC |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230250A (en) * | 2016-08-25 | 2016-12-14 | 山东神州电炉有限公司 | A kind of passive type PGC demodulation drives the method for medium frequency SCR |
| CN108323185A (en) * | 2017-03-25 | 2018-07-24 | 深圳欣锐科技股份有限公司 | A kind of input voltage signal sample 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 |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060220628A1 (en) * | 2005-03-31 | 2006-10-05 | International Rectifier Corporation | Current sense method for bridgeless boost (BLB) PFC circuit using single current transformer |
| EP1919064A2 (en) * | 2006-10-31 | 2008-05-07 | Hitachi, Ltd. | Power supply circuit and control circuit for use in the same |
| CN201156057Y (en) * | 2007-12-14 | 2008-11-26 | 青岛海信电器股份有限公司 | Zero-crossing detection circuit |
| CN201307826Y (en) * | 2008-10-13 | 2009-09-09 | 深圳创维－Rgb电子有限公司 | LCD-TV power supply voltage detecting circuit |
| CN102128969A (en) * | 2010-10-26 | 2011-07-20 | 北京鼎汉技术股份有限公司 | Method for testing input voltage of PFC (Power Factor Correction) circuit with high anti-interference ability |
| CN202256445U (en) * | 2011-09-01 | 2012-05-30 | 广东美的微波电器制造有限公司 | Voltage detection circuit |
| CN202535592U (en) * | 2012-03-01 | 2012-11-14 | 杭州乐图光电科技有限公司 | MR16LED lamp driving circuit and MR16LED lamp lighting system using the same |
| CN102946087A (en) * | 2012-11-26 | 2013-02-27 | 江苏力普电子科技有限公司 | Low voltage frequency converter provided with overvoltage protection function and overvoltage protection method of low voltage frequency converter |
| CN202886459U (en) * | 2012-09-29 | 2013-04-17 | 广东美的制冷设备有限公司 | Digital zero cross detection circuit and household air-conditioner |
| CN103364626A (en) * | 2012-03-26 | 2013-10-23 | 三垦电气株式会社 | Alternating current input voltage detection circuit |
| US20140035541A1 (en) * | 2012-08-06 | 2014-02-06 | Delta Electronics, Inc. | Control circuit, control method used in pfc circuit and power source system thereof |
| CN203524672U (en) * | 2013-07-24 | 2014-04-09 | 南京医科大学 | Magnetic sensor based system for acquiring weak biomagnetic signals |
-
2014
- 2014-05-05 CN CN201410186974.3A patent/CN103954828B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060220628A1 (en) * | 2005-03-31 | 2006-10-05 | International Rectifier Corporation | Current sense method for bridgeless boost (BLB) PFC circuit using single current transformer |
| EP1919064A2 (en) * | 2006-10-31 | 2008-05-07 | Hitachi, Ltd. | Power supply circuit and control circuit for use in the same |
| CN201156057Y (en) * | 2007-12-14 | 2008-11-26 | 青岛海信电器股份有限公司 | Zero-crossing detection circuit |
| CN201307826Y (en) * | 2008-10-13 | 2009-09-09 | 深圳创维－Rgb电子有限公司 | LCD-TV power supply voltage detecting circuit |
| CN102128969A (en) * | 2010-10-26 | 2011-07-20 | 北京鼎汉技术股份有限公司 | Method for testing input voltage of PFC (Power Factor Correction) circuit with high anti-interference ability |
| CN202256445U (en) * | 2011-09-01 | 2012-05-30 | 广东美的微波电器制造有限公司 | Voltage detection circuit |
| CN202535592U (en) * | 2012-03-01 | 2012-11-14 | 杭州乐图光电科技有限公司 | MR16LED lamp driving circuit and MR16LED lamp lighting system using the same |
| CN103364626A (en) * | 2012-03-26 | 2013-10-23 | 三垦电气株式会社 | Alternating current input voltage detection circuit |
| US20140035541A1 (en) * | 2012-08-06 | 2014-02-06 | Delta Electronics, Inc. | Control circuit, control method used in pfc circuit and power source system thereof |
| CN202886459U (en) * | 2012-09-29 | 2013-04-17 | 广东美的制冷设备有限公司 | Digital zero cross detection circuit and household air-conditioner |
| CN102946087A (en) * | 2012-11-26 | 2013-02-27 | 江苏力普电子科技有限公司 | Low voltage frequency converter provided with overvoltage protection function and overvoltage protection method of low voltage frequency converter |
| CN203524672U (en) * | 2013-07-24 | 2014-04-09 | 南京医科大学 | Magnetic sensor based system for acquiring weak biomagnetic signals |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230250A (en) * | 2016-08-25 | 2016-12-14 | 山东神州电炉有限公司 | A kind of passive type PGC demodulation drives the method for medium frequency SCR |
| 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 |
| CN108323185A (en) * | 2017-03-25 | 2018-07-24 | 深圳欣锐科技股份有限公司 | A kind of input voltage signal sample circuit in three-phase three-wire system pfc circuit |
| CN108323185B (en) * | 2017-03-25 | 2020-09-15 | 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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