CN203747687U - Power converter circuit with open-loop dynamic impedance self-matching function - Google Patents
Power converter circuit with open-loop dynamic impedance self-matching function Download PDFInfo
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- CN203747687U CN203747687U CN201320868622.7U CN201320868622U CN203747687U CN 203747687 U CN203747687 U CN 203747687U CN 201320868622 U CN201320868622 U CN 201320868622U CN 203747687 U CN203747687 U CN 203747687U
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- 239000003990 capacitor Substances 0.000 claims description 58
- 230000003139 buffering effect Effects 0.000 claims description 18
- 230000008878 coupling Effects 0.000 claims description 14
- 238000010168 coupling process Methods 0.000 claims description 14
- 238000005859 coupling reaction Methods 0.000 claims description 14
- 238000009499 grossing Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 6
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000002459 sustained effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to a power converter circuit with an open-loop dynamic impedance self-matching function, which belongs to the electrical electrician technical field. The power converter circuit comprises a control circuit C and a power main circuit Z. The power converter circuit which adopts a constant-energy pulse frequency modulation means can achieve over 90% energy utilization efficiency in conditions that an impedance match transformer is not needed. The power converter circuit has a wide-range dynamic impedance self-matching ability in an open loop condition. The output power is not influenced by load impedance and output frequencies and can be kept constant. The distortion factor of output waveforms within a bandwidth range of 4-5 orders of magnitude is less than 3%. Compared with a product adopting conventional technical designs and having basically the same output performance indexes, the power converter circuit has the whole machine weight reduced by approximately 95% while making the efficiency improved by about 40%. The total cost of the whole machine is lowered by approximately 60%. Therefore, the advantages are very prominent.
Description
Technical field
The utility model relates to a kind of power convertor circuit of open loop motional impedance from matching feature that have, and belongs to electric and electronic technical field.
Background technology
Under water in the detecting devices of resource, need to use that a kind of distortion factor is very little, frequency band is very wide, load impedance is continuously adjustable but require power output be constant in high-power sinewave output system.From existing product, technical scheme is nearly all the power amplification mode that adopts analog circuit, and realizes grade fixed point coupling that has of output impedance with many tapped transformers.Like this, not only make complete machine weight reach 110 kilograms of left and right, and capacity usage ratio is the highest only has 75%, more seriously be while changing continuously at load impedance, cannot realize FR continuous impedance matching with transformer, in addition, be subject to the impact of distributed constant in transformer winding technique, the aberration rate of output waveform obviously increases with the rising of operating frequency, thereby, be difficult to realize the coherence request of broadband lower frequency characteristic.
Summary of the invention
The utility model provides a kind of power convertor circuit of open loop motional impedance from matching feature that have, in order to solve the energy utilization efficiency that utilizes bulky impedance matching transformer to bring in conventional art low, can not carry out motional impedance from coupling, power output and the inconstant problem of the distortion factor in frequency band.
The technical solution of the utility model is: a kind of have the power convertor circuit of open loop motional impedance from matching feature, comprises control circuit C and the large module of power major loop Z two, described control circuit C comprises precise rectification circuit, accurate voltage to frequency conversion circuit, frequency-halving circuit, shaping pulse and coupling circuit, symmetrical zero passage comparison circuit, photoelectric coupling circuit, power major loop Z comprises permanent energy chopper circuit, buffer circuit, inverter circuit and filter circuit, described buffer circuit comprises sustained diode 5, buffering reactor L1, buffer capacitor Cb, the positive pole of DC power supply E in described power major loop Z is connected with the public input P0 of permanent energy chopper circuit, DC power supply E negative pole forms the common ground end of power major loop Z, its respectively with the anode of afterflow diode D5, one end of buffer capacitor Cb and the earth terminal of inverter circuit are connected, the other end of buffer capacitor Cb is connected with the public input P3 of inverter circuit, the output P1 of permanent energy chopper circuit respectively with the negative electrode of afterflow diode D5, one end of buffering reactor L1 is connected, the other end of buffering reactor L1 is connected with the public input P3 of inverter circuit.
Described permanent energy chopper circuit comprises high-power FET Q1, Q2, Q3, Q4, diode D1, D2, D3, D4 and storage capacitor Ca, field effect transistor Q1, the drain electrode of Q3 connects together and forms the input P0 of permanent energy chopper circuit, the source electrode of field effect transistor Q1 is through the diode D1 of two forward series connection, D2 is connected with the drain electrode of field effect transistor Q2, the source electrode of field effect transistor Q3 is through the diode D3 of two forward series connection, D4 is connected with the drain electrode of field effect transistor Q4, one end of storage capacitor Ca is connected in two diode D1, the centre of D2, the other end of storage capacitor Ca is connected in two diode D3, the centre of D4, field effect transistor Q2, the source electrode of Q4 connects together and forms the output P1 of permanent energy chopper circuit.
Described inverter circuit comprises field effect transistor Q5, Q6, Q7, Q8, described filter circuit comprises filter capacitor Cr, Ce, smoothing reactor L2, the drain electrode of the drain electrode of field effect transistor Q5 and field effect transistor Q7 connects together and forms the DC bus end P3 of inverter circuit, the source electrode of the source electrode of field effect transistor Q6 and field effect transistor Q8 connects together and forms the common ground end of inverter circuit, one end of filter capacitor Ce respectively with the source electrode of field effect transistor Q5, the drain electrode of field effect transistor Q6, one end of smoothing reactor L2 is connected, the other end of smoothing reactor L2 is connected with one end of filter capacitor Cr, the other end of filter capacitor Cr respectively with the source electrode of field effect transistor Q7, the drain electrode of field effect transistor Q8, the other end of filter capacitor Ce is connected with the drain electrode of field effect transistor Q8, load R
lbe connected in parallel on the two ends of filter capacitor Cr.
Of the present utility model have open loop motional impedance and from the main working process of the power convertor circuit of matching feature be:
A, the input sinusoidal voltage signal ui that need are amplified are divided into two-way, and the precise rectification circuit of leading up to is converted to high-precision pulsating dc voltage signal, and the symmetrical zero passage comparison circuit of separately leading up to is converted to the square-wave voltage signal of amplitude symmetry;
B, the high-precision pulsating dc voltage signal obtaining is obtained to unipolarity frequency modulation on pulse group voltage signal by accurate voltage to frequency conversion circuit conversion;
C, will obtain unipolarity frequency modulation on pulse group voltage signal by after frequency-halving circuit, after processing by shaping pulse and coupling circuit again, obtain the control signal of permanent energy chopper circuit, permanent energy chopper circuit runs on controlled LC series resonant circuit mode by this control signal by permanent energy chopper circuit, by storage capacitor Ca, discharging and recharging in a harmonic period acts on the each pulse that makes permanent energy chopper circuit output to permanent energy chopper circuit, no matter how its pulsewidth all accurately contains the electric flux of 1 unit;
D, on inverter bridge DC bus P3, form unipolarity frequency modulation on pulse group energy waveform the pulse of permanent energy chopper circuit output is reduced to the impact stress of instantaneous energy by buffer circuit after;
E, the square-wave voltage signal of the amplitude symmetry of symmetrical zero passage comparison circuit output is obtained to the control signal of inverter circuit after by photoelectric coupling circuit, inverter circuit is the linear bipolarity AC frequency modulation impulse train energy waveform of unit interval internal power mean value and input signal ui by this control signal by the unipolarity frequency modulation on pulse group energy waveform inversion on inverter bridge DC bus;
F, bipolarity AC frequency modulation impulse train energy waveform is passive by LC
after shape filter circuit, in load, obtain proportional to input signal ui in high-power sinusoidal waveform.
The core principles of this circuit system structure and operation is: no matter which kind of circuit topology form the power major loop of system adopts, the open loop energy transmission mode of whole power major loop must be the frequency modulation pattern of permanent energy pulse, in theory, the major loop output characteristic of system is typical power source characteristic, like this, according to principle of conservation of energy, the umber of pulse that its theoretical power output should be in the unit interval is multiplied by the contained energy value of each pulse and irrelevant with the exponent number of filter circuit.System index from having implemented, conforms to completely with calculated value.Index of correlation is: be output as 1～104Hz sine wave, load impedance 4～60 Ω are adjustable continuously, power output 1000 ± 5W, efficiency 93% ± 2%, waveform distortion≤3%, complete machine weight 5 Kg.
In the utility model, form six element circuits of control circuit C, be the integrated circuit (IC) products that can directly buy on ripe circuit or market, therefore, circuit theory diagrams and operation principle thereof that it is concrete are no longer discussed, below the specific works process of paper power major loop:
1, permanent energy chopper circuit and buffer circuit
The course of work of pulse: work wave as shown in Figure 3:
before moment, circuit enters stable state, and storage capacitor Ca both end voltage is E, and polarity is lower just upper negative, and the voltage that P1 is ordered is zero, and the energy in inductance L 1 all discharges;
during this time,
moment field effect transistor Q1, Q4 conducting, the voltage of energy copped wave bridge output P1 is 2E, the electric current on buffering reactor L1 starts to rise with sinusoidal rule, subsequently, storage capacitor Ca starts to release energy, and the polarity of its voltage is still lower just upper negative, and the voltage that P1 is ordered starts continuous decline from 2E.
during this time,
moment, when the voltage that permanent energy copped wave bridge output P1 is ordered becomes E, the voltage vanishing of storage capacitor Ca, subsequently, capacitor C a starts reverse charge, the polarity of capacitor C a transfers to just lower negative, permanent energy copped wave bridge comprises high-power FET Q1, Q2, Q3, Q4, wherein Q1 and Q4, Q2 and Q3 form respectively two brachium pontis, the voltage that permanent energy copped wave bridge output P1 is ordered continues to decline, until vanishing, now the voltage at capacitor C a two ends becomes E, just lower negative in polarity, the voltage at sustained diode 5 two ends in circuit is 0, buffering reactor L1, buffer capacitor Cb and diode D5 form afterflow path, electric current in buffering reactor L1 discharges through afterflow diode D5, because the capacity of capacitor C b is larger, so it is substantially constant that the voltage at its two ends can be thought, reactor L1 electric current to be cushioned is by after diode D5 afterflow, circuit enters the next stage.
during this time,
in the moment, field effect transistor Q2, Q3 conducting, next work period, repeat
process, at this moment the voltage on permanent energy copped wave bridge P1 point has again 2 times to the voltage of DC power supply E.After being discharged, storage capacitor Ca starts again reverse charge, but now institute's charging voltage is lower just upper negative, the voltage drop of ordering as P1 is to 0 time, and the pressure drop at diode D5 two ends is zero, afterflow is continued in the loop that reactor L1, filter capacitor Cb and fly-wheel diode form, and after this circuit again and so forth.
2, inverter circuit
In inverter circuit, inverter bridge comprises field effect transistor Q5, Q6, Q7, Q8, Q5 and Q8, Q6 and Q7 form respectively two brachium pontis, the control signal of inverter bridge is provided by symmetrical zero passage comparison circuit, like this, the each unipolarity frequency modulation on pulse group energy waveform on inverter bridge DC bus is all corresponding to a half cycle of input signal ui waveform.Suppose in certain half cycle, field effect transistor Q5, Q8 conducting and field effect transistor Q6, Q7 turn-offs, inverter bridge is output as a sinusoidal wave half cycle like this, and in the time that the waveform on inverter bridge DC bus is next half cycle, field effect transistor Q6, Q7 conducting and field effect transistor Q5, Q8 turn-offs, like this, inverter bridge is just with another half cycle of the same manner sine wave output, so move in circles, and at the output N1 of inverter bridge, between N2, form complete double polarity sine AC frequency modulation impulse train energy waveform, by this double polarity sine AC frequency modulation impulse train energy waveform through filter capacitor Ce, smoothing reactor L2, it is passive that filter capacitor Cr forms
after shape circuit filtering, can be at load R
lon obtain proportional to input signal ui in high-power sine wave.
What the utility model had designed has the power convertor circuit of open loop motional impedance from matching feature, and core methed is the frequency modulation(FM) means that adopt permanent energy pulse, has following beneficial effect without use impedance matching transformer in the situation that:
(1), more than 90% energy utilization efficiency;
(2) motional impedance that, has wide region under open loop condition is from matching capacity;
(3), power output is not subject to the impact of load impedance and output frequency and keeps constant;
(4), within the scope of the frequency range of 4 to 5 orders of magnitude, the distortion factor of output waveform is less than 3%.
(5), compared with adopting conventional art design and the essentially identical product of output performance index, complete machine weight has reduced approximately 95%, efficiency improves approximately 40%, complete machine total cost declines approximately 60%, advantage is quite obvious.
Brief description of the drawings
Fig. 1 is system architecture diagram of the present utility model;
Fig. 2 is power main loop circuit schematic diagram of the present utility model;
Fig. 3 is the output voltage waveform of permanent energy copped wave bridge of the present utility model.
Embodiment
Embodiment 1: as Figure 1-3, a kind of have the power convertor circuit of open loop motional impedance from matching feature, comprises control circuit C and the large module of power major loop Z two, described control circuit C comprises precise rectification circuit, accurate voltage to frequency conversion circuit, frequency-halving circuit, shaping pulse and coupling circuit, symmetrical zero passage comparison circuit, photoelectric coupling circuit, power major loop Z comprises permanent energy chopper circuit, buffer circuit, inverter circuit and filter circuit, described buffer circuit comprises sustained diode 5, buffering reactor L1, buffer capacitor Cb, the positive pole of DC power supply E in described power major loop Z is connected with the public input P0 of permanent energy chopper circuit, DC power supply E negative pole forms the common ground end of power major loop Z, its respectively with the anode of afterflow diode D5, one end of buffer capacitor Cb and the earth terminal of inverter circuit are connected, the other end of buffer capacitor Cb is connected with the public input P3 of inverter circuit, the output P1 of permanent energy chopper circuit respectively with the negative electrode of afterflow diode D5, one end of buffering reactor L1 is connected, the other end of buffering reactor L1 is connected with the public input P3 of inverter circuit.
Embodiment 2: as Figure 1-3, a kind of have the power convertor circuit of open loop motional impedance from matching feature, comprises control circuit C and the large module of power major loop Z two, described control circuit C comprises precise rectification circuit, accurate voltage to frequency conversion circuit, frequency-halving circuit, shaping pulse and coupling circuit, symmetrical zero passage comparison circuit, photoelectric coupling circuit, power major loop Z comprises permanent energy chopper circuit, buffer circuit, inverter circuit and filter circuit, described buffer circuit comprises sustained diode 5, buffering reactor L1, buffer capacitor Cb, the positive pole of DC power supply E in described power major loop Z is connected with the public input P0 of permanent energy chopper circuit, DC power supply E negative pole forms the common ground end of power major loop Z, its respectively with the anode of afterflow diode D5, one end of buffer capacitor Cb and the earth terminal of inverter circuit are connected, the other end of buffer capacitor Cb is connected with the public input P3 of inverter circuit, the output P1 of permanent energy chopper circuit respectively with the negative electrode of afterflow diode D5, one end of buffering reactor L1 is connected, the other end of buffering reactor L1 is connected with the public input P3 of inverter circuit.
Described permanent energy chopper circuit comprises high-power FET Q1, Q2, Q3, Q4, diode D1, D2, D3, D4 and storage capacitor Ca, field effect transistor Q1, the drain electrode of Q3 connects together and forms the input P0 of permanent energy chopper circuit, the source electrode of field effect transistor Q1 is through the diode D1 of two forward series connection, D2 is connected with the drain electrode of field effect transistor Q2, the source electrode of field effect transistor Q3 is through the diode D3 of two forward series connection, D4 is connected with the drain electrode of field effect transistor Q4, one end of storage capacitor Ca is connected in two diode D1, the centre of D2, the other end of storage capacitor Ca is connected in two diode D3, the centre of D4, field effect transistor Q2, the source electrode of Q4 connects together and forms the output P1 of permanent energy chopper circuit.
Embodiment 3: as Figure 1-3, a kind of have the power convertor circuit of open loop motional impedance from matching feature, comprises control circuit C and the large module of power major loop Z two, described control circuit C comprises precise rectification circuit, accurate voltage to frequency conversion circuit, frequency-halving circuit, shaping pulse and coupling circuit, symmetrical zero passage comparison circuit, photoelectric coupling circuit, power major loop Z comprises permanent energy chopper circuit, buffer circuit, inverter circuit and filter circuit, described buffer circuit comprises sustained diode 5, buffering reactor L1, buffer capacitor Cb, the positive pole of DC power supply E in described power major loop Z is connected with the public input P0 of permanent energy chopper circuit, DC power supply E negative pole forms the common ground end of power major loop Z, its respectively with the anode of afterflow diode D5, one end of buffer capacitor Cb and the earth terminal of inverter circuit are connected, the other end of buffer capacitor Cb is connected with the public input P3 of inverter circuit, the output P1 of permanent energy chopper circuit respectively with the negative electrode of afterflow diode D5, one end of buffering reactor L1 is connected, the other end of buffering reactor L1 is connected with the public input P3 of inverter circuit.
Described permanent energy chopper circuit comprises high-power FET Q1, Q2, Q3, Q4, diode D1, D2, D3, D4 and storage capacitor Ca, field effect transistor Q1, the drain electrode of Q3 connects together and forms the input P0 of permanent energy chopper circuit, the source electrode of field effect transistor Q1 is through the diode D1 of two forward series connection, D2 is connected with the drain electrode of field effect transistor Q2, the source electrode of field effect transistor Q3 is through the diode D3 of two forward series connection, D4 is connected with the drain electrode of field effect transistor Q4, one end of storage capacitor Ca is connected in two diode D1, the centre of D2, the other end of storage capacitor Ca is connected in two diode D3, the centre of D4, field effect transistor Q2, the source electrode of Q4 connects together and forms the output P1 of permanent energy chopper circuit.
Described inverter circuit comprises field effect transistor Q5, Q6, Q7, Q8, described filter circuit comprises filter capacitor Cr, Ce, smoothing reactor L2, the drain electrode of the drain electrode of field effect transistor Q5 and field effect transistor Q7 connects together and forms the DC bus end P3 of inverter circuit, the source electrode of the source electrode of field effect transistor Q6 and field effect transistor Q8 connects together and forms the common ground end of inverter circuit, one end of filter capacitor Ce respectively with the source electrode of field effect transistor Q5, the drain electrode of field effect transistor Q6, one end of smoothing reactor L2 is connected, the other end of smoothing reactor L2 is connected with one end of filter capacitor Cr, the other end of filter capacitor Cr respectively with the source electrode of field effect transistor Q7, the drain electrode of field effect transistor Q8, the other end of filter capacitor Ce is connected with the drain electrode of field effect transistor Q8, load R
lbe connected in parallel on the two ends of filter capacitor Cr.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned execution mode, in the ken possessing those of ordinary skill in the art, can also under the prerequisite that does not depart from the utility model aim, make various variations.
Claims (3)
1. there is the power convertor circuit of open loop motional impedance from matching feature, it is characterized in that: comprise control circuit C and the large module of power major loop Z two, described control circuit C comprises precise rectification circuit, accurate voltage to frequency conversion circuit, frequency-halving circuit, shaping pulse and coupling circuit, symmetrical zero passage comparison circuit, photoelectric coupling circuit, power major loop Z comprises permanent energy chopper circuit, buffer circuit, inverter circuit and filter circuit, described buffer circuit comprises fly-wheel diode (D5), buffering reactor (L1), buffer capacitor (Cb), the positive pole of the DC power supply E in described power major loop Z is connected with the public input (P0) of permanent energy chopper circuit, and DC power supply E negative pole forms the common ground end of power major loop Z, its respectively with the anode of afterflow diode (D5), one end of buffer capacitor (Cb) and the earth terminal of inverter circuit are connected, and the other end of buffer capacitor (Cb) is connected with the public input (P3) of inverter circuit, the output (P1) of permanent energy chopper circuit respectively with the negative electrode of afterflow diode (D5), one end of buffering reactor (L1) is connected, and the other end of buffering reactor (L1) is connected with the public input (P3) of inverter circuit.
2. according to claim 1 have the power convertor circuit of open loop motional impedance from matching feature, it is characterized in that: described permanent energy chopper circuit comprises high-power FET (Q1, Q2, Q3, Q4), diode (D1, D2, D3, and storage capacitor (Ca) D4), field effect transistor (Q1, Q3) drain electrode connects together and forms the input (P0) of permanent energy chopper circuit, the source electrode of field effect transistor (Q1) is through the diode (D1 of two forward series connection, D2) be connected with the drain electrode of field effect transistor (Q2), the source electrode of field effect transistor (Q3) is through the diode (D3 of two forward series connection, D4) be connected with the drain electrode of field effect transistor (Q4), one end of storage capacitor (Ca) is connected in two diode (D1, D2) centre, the other end of storage capacitor (Ca) is connected in two diode (D3, D4) centre, field effect transistor (Q2, Q4) source electrode connects together and forms the output (P1) of permanent energy chopper circuit.
3. according to claim 1 have the power convertor circuit of open loop motional impedance from matching feature, it is characterized in that: described inverter circuit comprises field effect transistor (Q5, Q6, Q7, Q8), described filter circuit comprises filter capacitor (Cr, Ce), smoothing reactor (L2), the drain electrode of the drain electrode of field effect transistor (Q5) and field effect transistor (Q7) connects together and forms the DC bus end (P3) of inverter circuit, the source electrode of the source electrode of field effect transistor (Q6) and field effect transistor (Q8) connects together and forms the common ground end of inverter circuit, one end of filter capacitor (Ce) respectively with the source electrode of field effect transistor (Q5), the drain electrode of field effect transistor (Q6), one end of smoothing reactor (L2) is connected, the other end of smoothing reactor (L2) is connected with one end of filter capacitor (Cr), the other end of filter capacitor (Cr) respectively with the source electrode of field effect transistor (Q7), the drain electrode of field effect transistor (Q8), the other end of filter capacitor (Ce) is connected with the drain electrode of field effect transistor (Q8), load (R
l) be connected in parallel on the two ends of filter capacitor (Cr).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320868622.7U CN203747687U (en) | 2013-12-27 | 2013-12-27 | Power converter circuit with open-loop dynamic impedance self-matching function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320868622.7U CN203747687U (en) | 2013-12-27 | 2013-12-27 | Power converter circuit with open-loop dynamic impedance self-matching function |
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| CN203747687U true CN203747687U (en) | 2014-07-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684029A (en) * | 2013-12-27 | 2014-03-26 | 昆明理工大学 | Power conversion method with function of open-loop dynamic impedance self-matching and circuit thereof |
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2013
- 2013-12-27 CN CN201320868622.7U patent/CN203747687U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684029A (en) * | 2013-12-27 | 2014-03-26 | 昆明理工大学 | Power conversion method with function of open-loop dynamic impedance self-matching and circuit thereof |
| CN103684029B (en) * | 2013-12-27 | 2016-05-11 | 昆明理工大学 | A kind of have power converter method and the circuit thereof of open loop motional impedance from matching feature |
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