CN201197117Y - Frequency conversion type voltage-regulation circuit - Google Patents
Frequency conversion type voltage-regulation circuit Download PDFInfo
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- CN201197117Y CN201197117Y CNU2008200099750U CN200820009975U CN201197117Y CN 201197117 Y CN201197117 Y CN 201197117Y CN U2008200099750 U CNU2008200099750 U CN U2008200099750U CN 200820009975 U CN200820009975 U CN 200820009975U CN 201197117 Y CN201197117 Y CN 201197117Y
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- 238000006243 chemical reaction Methods 0.000 title claims description 34
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 13
- 238000007600 charging Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
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Abstract
The utility model relates to a variable frequency type voltage-regulating circuit, which is applied to a power supplying device provided with a voltage-boosting unit and an electric power converting unit, wherein the voltage-boosting unit modulates an input electric power and converts the input electric power into a voltage-boosting electric power; a voltage-boosting control circuit is also connected with the variable frequency type voltage-regulating circuit which comprises a voltage-detecting circuit and a frequency-setting circuit, wherein the voltage-detecting circuit detects the input electric power transmitted to the voltage-boosting unit and generates an input level signal according to the intensity of the input electric power; and the frequency-setting circuit generates a corresponding reference frequency signal according to the input level signal and regulates the electric power converting frequency of the voltage-boosting unit according to the reference frequency signal; according to the circuit structure, the intensity of the input electric power is judged, then the voltage-boosting unit works at different frequencies according to the intensity of the input electric power, thereby having the advantages of reducing the operating load of a known voltage-boosting unit, reducing the switching loss, and reducing harmonic waves and noises.
Description
Technical field
The utility model relates to a kind of frequency conversion type regulating circuit, is a kind of circuit of importing the input electric power of a power supply unit by converter technique and switching voltage-regulating technique with adjustment.
Background technology
As shown in Figure 1, most power supply unit (transducer that comprises AC/DC or DC/DC) all comprises filtering and rectification unit 1, the power conversion unit 3 of one boosting unit 2 (comprise known power factor correction function unit and also have the effect of boosting) and a suitching type, this power supply unit is obtained an input electric power 8 by this filtering and rectification unit 1 after connecting a power source, (the same via this boosting unit 2 again, also comprise known power factor correction function unit) adjust the voltage of this input electric power 8 and form the electric power that boosts, and is that an output power 9 drives at least one load via this power conversion unit 3 with this power conversions of boosting, wherein this boosting unit 2 comprises a charging and discharging circuit, one switch element and one produces the boost control circuit of this switch element conducting of a drive, this boost control circuit is adjusted the empty accounting (duty ratio) of this drive signal, that is the turn-on cycle width of controlling this drive signal to be to adjust the ON time of this switch element, further controls the voltage of this charging and discharging circuit and reaches this input electric power 8 boosted and form the purpose of this electric power that boosts; Above-mentioned boosting unit 2 is except the empty accounting (dutyratio) of adjusting this drive signal, known boosting unit 2 also is divided into continuous current pattern (Continuous Current Mode, CCM) with discontinuous current-mode (Discintinuous Current Mode, DCM) two kinds, discontinuous current-mode major part now only is used for low power power supply unit, and power supply unit is controlled to be main flow with the continuous current pattern now, wherein, because of this continuous current pattern that limits of its operation principle is all and decides frequency formula control, that is this boosting unit 2 this switch element of drive of utilizing fixed frequency to be controlling the current cycle of this charging and discharging circuit, and the empty accounting of its drive signal (duty ratio) is subjected to the influence of load height; Yet, above-mentioned boosting unit 2 (comprising known power factor correction function unit) provides the electric power that boosts of deciding voltage for reaching, the turn-on cycle of its switch element must very significantly change with input current, for example importing electric power 8 has height and floats between may be from 90V to 150V when fluctuating, and this boosting unit 2 is in order to provide the electric power that boosts of 380V, must make the turn-on cycle of this switch element significantly prolong so that the voltage liter of 290V to be provided, therefore make this switch element bear sizable electric current, and under high pressure the handoff loss of Chan Shenging (switching loss) is very big, relatedly make the influence of harmonic wave and noise (NOISE) very obvious, remain to be improved.
The utility model content
When working in the continuous current pattern in view of known booster circuit, need significantly adjust the turn-on cycle of switch element in this booster circuit because of fixed-frequency, and produce tangible handoff loss, harmonic wave and noise, and this switch element need bear bigger electric current, causes the problem that cost improves or the life-span reduces.
The utility model is a kind of frequency conversion type regulating circuit, be used in power supply unit with a boosting unit and a power conversion unit, and this power supply unit connects an input source to obtain an input electric power, wherein comprise a boost control circuit in this boosting unit and a continuous current pattern is provided, this boost control circuit obtain a reference frequency with this input electric power of modulation to be converted to the electric power that boosts, and this boost control circuit also connects a frequency conversion type regulating circuit, this frequency conversion type regulating circuit comprises a voltage detection circuit and a frequency setting circuit, wherein this voltage detection circuit detecting is sent to the input electric power of this boosting unit, and produce an input position calibration signal according to the size of this input electric power, this frequency setting circuit then produces a corresponding reference frequency signal according to this input position calibration signal, and transmit this reference frequency signal to this boost control circuit to adjust the frequency of this boosting unit power conversion; Judge the height of this input electric power by above-mentioned circuit framework, and make this boosting unit import the height of electric power and to work in different frequencies according to this, change by operating frequency can make this boosting unit reach the effect that this input electric power is boosted to the certain bits standard with lower handoff loss, and lower frequency is also being represented and can be in the identical time had long turn-on cycle with less switching times, thereby can reduce the operating load of this boosting unit and reduce handoff loss and harmonic wave, generating noise.
In sum, the beneficial effect that the utility model reached is as follows:
1. can reduce the operating load of this boosting unit.
2. reduce handoff loss and harmonic wave, generating noise.
Description of drawings
Fig. 1 is a known power source supply framework calcspar.
Fig. 2 is the framework calcspar of the utility model one embodiment.
Fig. 3 is the framework calcspar of the utility model preferred embodiment.
Fig. 4 is the frequency curve chart () of the utility model and known technology.
Fig. 5 is the frequency curve chart (two) of the utility model and known technology.
Embodiment
Relevant detailed description of the present utility model and technology contents now cooperate schematic view illustrating as follows:
See also Fig. 2, wherein this power supply unit has filtering and rectification unit 1, one boosting unit 2 and a power conversion unit 3, this filtering is connected an input source and obtains an input electric power 8 with rectification unit 1, this input electric power 8 is delivered to this boosting unit 2 after filtering and rectification, this boosting unit 2 comprises a boost control circuit 21, by an energy storage inductor 22, the charging and discharging circuit that one diode 24 and a storage capacitor 25 are constituted, an and switch element 23 that is connected in this charging and discharging circuit, this boosting unit 2 provides a continuous current pattern (Continuous Current Mode, CCM) modulation should be imported electric power 8, this charging and discharging circuit obtains this input electric power 8 chargings, this boost control circuit 21 produces a pulse wave signal to control the turn-on cycle of this switch element 23 according to a reference frequency, thereby further control the sequential that discharges and recharges of 8 pairs of these charging and discharging circuit of this input electric power, thereby should import electric power 8 and be converted to the electric power that boosts and deliver to this power conversion unit 3, is that an output power 9 is to drive load by this power conversion unit 3 with this power conversions of boosting, this boost control circuit 21 can be obtained a feedback signal from this power conversion unit 3, and adjusts the empty accounting (duty ratio) of this pulse wave signal according to this feedback signal; Yet, this boost control circuit 21 also connects a frequency conversion type regulating circuit 4, this frequency conversion type regulating circuit 4 comprises a voltage detection circuit 41 and a frequency setting circuit 42, wherein these voltage detection circuit 41 detectings are sent to the input electric power 8 of this boosting unit 2, and produce an input position calibration signal according to the size of this input electric power 8,42 of this frequency setting circuits produce a corresponding reference frequency signal according to this input position calibration signal, and transmit this reference frequency signal to this boost control circuit 21 to adjust the frequency of these boosting unit 2 power conversions; The input position calibration signal that above-mentioned voltage detection circuit 41 produces can be imported the proportional linearity change of electric power 8 with this, and after this frequency setting circuit 42 obtains this input position calibration signal, the linearity change that can make reference frequency that this reference frequency signal provides and this input position calibration signal be inverse ratio, as shown in Figure 4, Fig. 4 is the curve chart of this input electric power 8 with these boosting unit 2 operating frequencies, the frequency curve 71 that wherein comprises a given frequency curve 70 and a modulation, known boosting unit 2 is with continuous current pattern (Continuous Current Mode, this given frequency curve 70 is a straight line (frequently fixed) when CCM) working, the electric power that boosts that empty accounting (duty ratio) that only utilize to adjust this pulse wave signal is kept behind the modulation has fixed voltage, the frequency curve 71 of reviewing this modulation is the straight line that is inversely proportional to this input electric power 8, when therefore the voltage of this input electric power 8 is higher, this frequency setting circuit 42 can produce the lower reference frequency signal of frequency, make this boosting unit 2 with lower frequency work, to reduce switch cost and harmonic wave, noise, and the operating load that reduces this boosting unit 2.
Another embodiment of foregoing circuit framework also can make this voltage detection circuit 41 set a fiducial value and compare with this input electric power 8, on behalf of this input electric power 8, make this input position calibration signal have be higher than a high levle of this fiducial value, and represent this input electric power 8 to be lower than a low level of this fiducial value, and this frequency setting circuit 42 is set this reference frequency signal and can be tuned as a different first frequency or a second frequency, this reference frequency signal was tuned as this first frequency when wherein this input position calibration signal was high levle, this reference frequency signal was tuned as this second frequency when this input position calibration signal was low level, thereby make this frequency conversion type regulating circuit 4 can provide this boosting unit 2 two different reference frequencies, and above-mentioned first frequency is lower than this second frequency, to make the frequency work that this boosting unit 2 can be lower when these input electric power 8 voltages are higher; And the voltage detection circuit 41 of above-mentioned another embodiment also connects a hysteresis circuit 43 and adjusts this fiducial value (as shown in Figure 3) to produce a buffer voltagc, wherein this buffer voltagc is turned down this fiducial value according to the reverse buffer voltagc of high levle triggering for generating of this input position calibration signal, and this fiducial value is heightened according to the low level triggering for generating forward buffer voltagc of this input position calibration signal, so can after sending the input position calibration signal of high levle, this voltage detection circuit 41 make this fiducial value descend, to avoid this input electric power 8 floating and frequency is beated fast slightly, in like manner, this hysteresis circuit 43 makes this fiducial value rise send the input position calibration signal of low level in this voltage detection circuit 41 after, also has identical effect; This input electric power 8 sees also Fig. 5 with the curve chart of these boosting unit 2 operating frequencies in the foregoing description, also visible this given frequency curve 70 among this figure, the frequency curve 72 of this modulation then is divided into a lower first frequency and a higher second frequency, when wherein the voltage of this input electric power 8 is higher than the fiducial value of setting then the frequency curve 72 of this modulation drop to about 65KHz, when these input electric power 8 voltages are lower than the fiducial value of setting then the frequency curve 72 of this modulation rise to 130KHz, thereby reach above-mentioned minimizing switch cost and harmonic wave, noise, and the beneficial functional that reduces these boosting unit 2 operating loads.
Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; and a little change and the retouching done; all should be covered by in the utility model, therefore protection range of the present utility model is as the criterion when looking the claim person of defining.
Claims (9)
1. frequency conversion type regulating circuit, be used to have the power supply unit of a boosting unit (2) and a power conversion unit (3), and described power supply unit connects an input source to obtain an input electric power (8), comprise a boost control circuit (21) in the wherein said boosting unit (2) and a continuous current pattern is provided, described boost control circuit (21) according to a reference frequency with the described input electric power of modulation (8) to be converted to the electric power that boosts, and described boost control circuit (21) also connects a frequency conversion type regulating circuit (4), it is characterized in that described frequency conversion type regulating circuit (4) comprises:
One voltage detection circuit (41), detecting is sent to the input electric power (8) of described boosting unit (2), and produces an input position calibration signal according to the size of described input electric power (8);
One frequency setting circuit (42) produces a corresponding reference frequency signal according to a described input position calibration signal, and transmit described reference frequency signal extremely described boost control circuit (21) to adjust the frequency of described boosting unit (2) power conversion.
2. frequency conversion type regulating circuit according to claim 1, it is characterized in that, described voltage detection circuit (41) is set a fiducial value and is compared with described input electric power (8), make described input position calibration signal have the described input electric power of representative (8) and be higher than a high levle of described fiducial value, and represent described input electric power (8) to be lower than a low level of described fiducial value.
3. frequency conversion type regulating circuit according to claim 2, it is characterized in that, described frequency setting circuit (42) is set described reference frequency signal can be tuned as a different first frequency or a second frequency, described reference frequency signal was tuned as described first frequency when wherein said input position calibration signal was high levle, and described reference frequency signal was tuned as described second frequency when described input position calibration signal was low level.
4. frequency conversion type regulating circuit according to claim 3 is characterized in that described first frequency is lower than described second frequency.
5. frequency conversion type regulating circuit according to claim 2, it is characterized in that, described voltage detection circuit (41) also connects a hysteresis circuit (43) and adjusts described fiducial value to produce a buffer voltagc, wherein said buffer voltagc is turned down described fiducial value according to the reverse buffer voltagc of high levle triggering for generating of described input position calibration signal, and according to the low level triggering for generating forward buffer voltagc of described input position calibration signal described fiducial value is heightened.
6. frequency conversion type regulating circuit according to claim 1 is characterized in that, the linearity change that input position calibration signal that described voltage detection circuit (41) produces and described input electric power (8) are proportional.
7. frequency conversion type regulating circuit according to claim 1 is characterized in that, the linearity change that described frequency setting circuit (42) makes reference frequency that described reference frequency signal provides and described input position calibration signal be inverse ratio.
8. frequency conversion type regulating circuit according to claim 1, it is characterized in that, described boosting unit (2) comprises switch element (23) and the described boost control circuit (21) that the charging and discharging circuit, that obtains described input electric power (8) charging is connected in described charging and discharging circuit, described boost control circuit (21) produces a pulse wave signal controlling the turn-on cycle of described switch element (23) according to described reference frequency, and the turn-on cycle by described switch element (23) is to control the discharge and recharge sequential of described input electric power (8) to described charging and discharging circuit.
9. frequency conversion type regulating circuit according to claim 8 is characterized in that, described boost control circuit (21) is obtained a feedback signal from described power conversion unit (3), and adjusts the empty accounting of described pulse wave signal according to described feedback signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200099750U CN201197117Y (en) | 2008-04-29 | 2008-04-29 | Frequency conversion type voltage-regulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200099750U CN201197117Y (en) | 2008-04-29 | 2008-04-29 | Frequency conversion type voltage-regulation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201197117Y true CN201197117Y (en) | 2009-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200099750U Expired - Fee Related CN201197117Y (en) | 2008-04-29 | 2008-04-29 | Frequency conversion type voltage-regulation circuit |
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| CN (1) | CN201197117Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105096882A (en) * | 2015-08-25 | 2015-11-25 | 昆山龙腾光电有限公司 | Drive system for liquid crystal display panels and liquid crystal display device |
| CN106068609A (en) * | 2014-06-04 | 2016-11-02 | 株式会社日立产机系统 | Power inverter and control method |
| TWI610527B (en) * | 2015-08-18 | 2018-01-01 | 力旺電子股份有限公司 | Power system with detecting function |
-
2008
- 2008-04-29 CN CNU2008200099750U patent/CN201197117Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106068609A (en) * | 2014-06-04 | 2016-11-02 | 株式会社日立产机系统 | Power inverter and control method |
| TWI610527B (en) * | 2015-08-18 | 2018-01-01 | 力旺電子股份有限公司 | Power system with detecting function |
| US10032520B2 (en) | 2015-08-18 | 2018-07-24 | Ememory Technology Inc. | Power system with detecting function |
| CN105096882A (en) * | 2015-08-25 | 2015-11-25 | 昆山龙腾光电有限公司 | Drive system for liquid crystal display panels and liquid crystal display device |
| CN105096882B (en) * | 2015-08-25 | 2018-04-20 | 昆山龙腾光电有限公司 | The drive system and liquid crystal display device of liquid crystal display panel |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090218 Termination date: 20170429 |
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| CF01 | Termination of patent right due to non-payment of annual fee |