CN104617790A - Isolating voltage stabilizing circuit and control method thereof - Google Patents
Isolating voltage stabilizing circuit and control method thereof Download PDFInfo
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- CN104617790A CN104617790A CN201510027524.4A CN201510027524A CN104617790A CN 104617790 A CN104617790 A CN 104617790A CN 201510027524 A CN201510027524 A CN 201510027524A CN 104617790 A CN104617790 A CN 104617790A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an isolating voltage stabilizing circuit and a control method thereof. The isolating voltage stabilizing circuit is controlled through a boosting PFC circuit, and the isolating voltage stabilizing circuit outputs at least one passage of stable voltage to supply power for a post-stage circuit. The isolating voltage stabilizing circuit and the control method thereof solve the problem of unstable post-stage circuit assisting power supply voltage or post-stage circuit assisting power supply voltage disappearing due to input voltage change, post-stage circuit output power failure, short circuit or the like faults; auxiliary power supply is realized through combining a transformer with at least one group of secondary line windings with at least one dual voltage rectifying filtering circuit, and the problems of high cost and large volume due to using an independent AC-DC power supply module to supply power are solved.
Description
Technical field
The present invention relates to a kind of isolation voltage stabilizing circuit and control mode thereof, particularly a kind of isolation voltage stabilizing circuit of off-line type AC-DC converter and control method.
Background technology
Along with the development of science and technology, country and industry also more and more higher for the requirement of Switching Power Supply, green highly reliable power supply arises at the historic moment.Industry and folk power supply generally adopt Alternating Current Power Supply, in fact, are often that alternating current is transformed into direct current by Switching Power Supply, supply power consumption equipment.In order to realize green highly reliable power supply, country and industry standard all propose further requirement to the power factor (PF) of the electric supply installation of power consumption equipment and defencive function.At present; in more than 75W, powerful Switching Power Supply all has circuit of power factor correction (PFC) and more protects testing circuit (as defencive functions such as overvoltage protection, overpower protection, overheat protector, short-circuit protections), to meet standard-required.Power factor (PF) circuit can reduce the reactive power of power consumption equipment, reduces grid loss.Protective circuit can the rear class power consumption equipment of protection switch power supply or Switching Power Supply this do not damage or prevent security incident when Switching Power Supply or rear class power consumption equipment break down.When the realization key of the protective circuit in Switching Power Supply is that Switching Power Supply or rear class power consumption equipment break down, the testing circuit in protective circuit and control circuit can reliable power supplies.
In current power electronics industry, power factor correction technology is very ripe, and improve power factor, mainly contain two approach, one is make input voltage and input current same-phase, and two is make input current sineization.Circuit of power factor correction is divided into passive type power factor correction and active power factor correction two kinds.Because the power factor of passive type circuit of power factor correction is low, it is mainly applied in the Switching Power Supply of small-power, low cost. and active power-factor correction circuit has the advantages such as power factor is high, harmonic current is low, transformation efficiency is high, is widely used in middle high power switching power supply.Active power-factor correction circuit can make input current waveform perfect tracking AC input voltage waveform, makes input current waveform be pure sine wave, and and input voltage same-phase, now rectifier load can be equivalent to pure resistance.
The realization of the protective circuit in Switching Power Supply mainly comprises power supply circuits, testing circuit, buffer circuit and control circuit, and wherein power supply circuits are keys of its reliability.There is provided power supply to mainly contain two kinds of approach to protective circuit in current Switching Power Supply, one is assist winding by the transformer in DC-DC converter, powers after rectifying and wave-filtering, and two is powered by independent AC-DC power module.Above-mentioned two kinds of existing supply power modes all Shortcomings, mode one, when power supply DC-DC converter exports fault, the supply power voltage of protective circuit is unstable or disappear, and causes protection power drop or inefficacy, reduces stability and the reliability of system; Mode two, adopts independent AC-DC power module to power and can cause the cost of Switching Power Supply height and the large problem of volume.
Summary of the invention
One object of the present invention is to provide a kind of control method of isolating voltage stabilizing circuit, first object of the present invention is achieved through the following technical solutions: a kind of control method of isolating voltage stabilizing circuit, realizes the control to isolation voltage stabilizing circuit by rectification circuit, boost PFC circuit; Civil power is converted into a galvanic current pressure by boost PFC circuit, the former limit winding of the first transformer is as the energy storage inductor in boost PFC circuit, during boost PFC circuit work, the winding two ends, former limit of the first transformer can apply a high-frequency alternating voltage, this voltage arrives secondary by transformer coupled, produce a high-frequency alternating voltage at vice-side winding two ends, after the filtering of voltage-multiplying circuit voltage multiplying rectifier, produce a stable DC voltage.First transformer can have one or more vice-side winding, produces one or more stable DC voltage supply one or more late-class circuit by above-mentioned control method.
This control mode reduces because input voltage changes the impact caused late-class circuit, under solving failure condition such as late-class circuit output power down and short circuit etc., the problem of auxiliary power supply voltage instability or disappearance, for the single channel of rear class or multiplex circuit provide reliable and stable power supply, solve in current industry simultaneously and adopt high, the bulky problem of independent power supply device power supply cost.
Another object of the present invention is: provide a kind of isolation voltage stabilizing circuit.The second object of the present invention is achieved through the following technical solutions: a kind of isolation voltage stabilizing circuit, comprises a boost PFC circuit, the first transformer of an at least one group of vice-side winding, at least one voltage multiplying rectifier filter circuit; The vice-side winding of the first transformer powers at least one road late-class circuit by voltage multiplying rectifier filter circuit.The former limit winding of the first transformer is as the energy storage inductor of boost PFC circuit, and voltage multiplying rectifier filter circuit comprises the first diode, the second diode, the first electric capacity, the second electric capacity; Winding one end, former limit of first transformer is just being connected to the output of input rectification circuit, the other end is connected to the drain electrode of boost PFC circuit switching tube and the anode of fly-wheel diode, the anode of the first diode is connected to one end of vice-side winding, and the negative electrode of the first diode is connected to the anode of the second diode and one end of the first electric capacity; The other end of the first electric capacity is connected to the other end of the first transformer secondary winding; The two ends of the second electric capacity connect the anode of the first diode and the negative electrode of the second diode respectively, and the two ends of the second electric capacity are connected respectively to late-class circuit.
Compared with prior art, beneficial effect of the present invention is as follows:
1, by the auxiliary power supply voltage that isolation voltage stabilizing circuit of the present invention produces, the problem due to the auxiliary power supply voltage instability under input voltage change or failure condition such as late-class circuit output power down or short circuit etc. or disappearance is solved;
2, by by having at least one group to assist the transformer of winding and at least one voltage multiplying rectifier filter circuit to combine, achieving auxiliary power supply, solving the cost height and bulky problem that adopt independent current source module for power supply.
Accompanying drawing explanation
The circuit theory diagrams of Fig. 1 for adopting independent AC-DC power module to provide auxiliary power supply in prior art;
Fig. 2 for being provided the circuit theory diagrams of auxiliary power supply after rectifying and wave-filtering by the auxiliary winding of the transformer of DC-DC converter in prior art;
Fig. 3 is the circuit theory diagrams that the isolation voltage stabilizing circuit of two-way of the present invention output is applied in AC-DC converter;
Fig. 4 is the operating voltage oscillogram of isolation voltage stabilizing circuit of the present invention
Embodiment
Embodiment one
Below in conjunction with Fig. 3, embodiment one is described in detail.Fig. 3 is the circuit diagram that the isolation voltage stabilizing circuit of two-way output is applied in AC-DC converter.A kind of isolation voltage stabilizing circuit, comprise a boost PFC circuit, there is the first transformer T11 of two vice-side winding, comprise the voltage multiplying rectifier filter circuit of the first diode D11, the second diode D22, the first electric capacity C11, the second electric capacity C22, and comprise the voltage multiplying rectifier filter circuit of the 3rd diode D33, the 4th diode D44, the 3rd electric capacity C33, the 4th electric capacity C44.
The anode of the first diode D11 is connected to one end of the first transformer first vice-side winding N2, and the negative electrode of the first diode D11 is connected to the anode of the second diode D22 and one end of the first electric capacity C11; The other end of the first electric capacity C11 is connected to the other end of the first transformer first vice-side winding N2; The two ends of the second electric capacity C22 connect the anode of the first diode D11 and the negative electrode of the second diode D22 respectively, and the two ends of the second electric capacity C22 are connected respectively to late-class circuit DC-DC control circuit, power to DC-DC control circuit.
The anode of the 3rd diode D33 is connected to one end of the first transformer second vice-side winding N3, and the negative electrode of the 3rd diode D33 is connected to the anode of the 4th diode D44 and one end of the 3rd electric capacity C33; The other end of the 3rd electric capacity C33 is connected to the other end of the first transformer second vice-side winding N3; The two ends of the 4th electric capacity C44 connect the anode of the 3rd diode D33 and the negative electrode of the 4th diode D44 respectively, and the two ends of the 4th electric capacity C44 are connected respectively to late-class circuit protective circuit, power to protective circuit.
Its operation principle is: the isolation voltage stabilizing circuit repeated work that the present invention relates to is at following two states, to-t1 operating state: the switching tube Q1 conducting in boost PFC circuit, diode D1 ends, the termination rectification circuit output plus terminal of the same name of the first transformer primary side winding N1, the anode tap of the termination of the same name first diode D11 of the first vice-side winding N2, the anode tap of the termination of the same name 3rd diode D33 of the second vice-side winding N3.Input voltage is after-applied to the first transformer primary side winding N1 two ends through rectification circuit, magnetic flux in first transformer changes, induced voltage is produced in the first vice-side winding N2 and the second vice-side winding N3 of the first transformer, induced voltage makes the first diode D11 and the 3rd diode D33 conducting, and the second diode D22 and the 4th diode D44 ends.The induced voltage of the first vice-side winding N2 fills C11 electricity by the first diode D11 to the first electric capacity, and the second electric capacity C22 powers to rear class DC-DC control circuit.The induced voltage of the second vice-side winding N3 is charged to the 3rd electric capacity C33 by the 3rd diode D33, and the 4th electric capacity C44 powers to rear class protective circuit.
T1-t2 operating state: the switching tube Q1 in boost PFC circuit turns off, diode D1 conducting, first transformer primary side winding N1 both end voltage upset, the induced voltage that first vice-side winding N2 of the first transformer and the second vice-side winding N3 two ends of the first transformer produce overturns thereupon, induced voltage after upset makes the second diode D22 and the 4th diode D44 conducting, and the first diode D11 and the 3rd diode D33 ends.On the induced voltage of the first vice-side winding N2 and the first electric capacity, the voltage of C11 to be charged to the second electric capacity C22 by the second diode D22 after being added and powers to rear class DC-DC control circuit.By the 4th diode D44 the 4th electric capacity C44 charged after voltage on the induced voltage of the second vice-side winding N3 and the 3rd electric capacity C33 is added and power to rear class protective circuit.
Output voltage Vg due to boost PFC circuit is stable DC voltage, owing to isolating first group of output voltage V of voltage stabilizing circuit
o_s1linearly proportional with PFC output voltage Vg, proportionality constant is n1 (the former limit number of turn of the first transformer and the ratio of the first vice-side winding number of turn).Second group of output voltage V
o_s2linearly proportional with PFC output voltage Vg, proportionality constant is n2 (the former limit number of turn of the first transformer and the ratio of the second vice-side winding number of turn).The output voltage of therefore isolating voltage stabilizing circuit is the direct voltage being controlled by boost PFC circuit output voltage Vg, and concrete formula is recommended as follows:
N1/N3＝n1＝V
L_P/V
L_S1--------------------------------------(1)
N1/N2＝n2＝V
L_P/V
L_S2--------------------------------------(2)
Wherein V
l_Pthe voltage at transformer primary side winding N1 two ends, V
l_S1the voltage at the first vice-side winding N2 two ends, V
l_S2the voltage at the second vice-side winding two ends.
T0-t1: boost PFC circuit breaker in middle pipe Q1 conducting, diode D1 ends, D11 and D33 conducting in voltage-multiplying circuit, D22 and D44 ends, the first transformer primary side winding N1 both end voltage V
l_P=V
in, can be obtained by equation (1) and equation (2)
V
C11＝V
L_S1＝V
in/n1----------------------------------------------(3)
V
C33＝V
L_S2＝V
in/n2---------------------------------------------(4)
Wherein V
c11the voltage at electric capacity C11 two ends, V
c33be the voltage at electric capacity C33 two ends, Vin is the output voltage of input rectification circuit.
T1-t2: boost PFC circuit breaker in middle pipe Q1 turns off, diode D1 conducting, D11 and D33 cut-off in voltage-multiplying circuit, D22 and D44 conducting, the first transformer primary side winding N1 both end voltage V
l_P=V
g-V
in, V
git is the cathode voltage of boost PFC circuit fly-wheel diode.The first vice-side winding N2 both end voltage V of the first transformer can be obtained by equation (1) and equation (2)
l_S1with the second vice-side winding N3 both end voltage V of the first transformer
l_S2
V
L_S1＝(V
g-V
in)/n1--------------------------------------------(5)
V
L_S2＝(V
g-V
in)/n2-------------------------------------------(6)
First vice-side winding N2 both end voltage V of the t1-t2: the first transformer
l_S1charge to electric capacity C22 after being added with electric capacity C11 both end voltage, power to rear class DC-DC control circuit simultaneously.Second vice-side winding N3 both end voltage V of the first transformer
l_S2charge to electric capacity C44 after being added with electric capacity C33 both end voltage, power to rear class protective circuit simultaneously, first group of output voltage V can be obtained by equation (3) (4) (5) (6)
o_s1with second group of output voltage V
o_s2
V
o_s1＝V
in/n+(V
g-V
in)/n1＝V
g/n1
V
o_s2＝V
in/n+(V
g-V
in)/n2＝V
g/n2
Embodiment two
With embodiment one unlike, the first transformer only has one group of vice-side winding N2, isolation voltage stabilizing circuit only have one tunnel export, provide stable voltage to a late-class circuit, its connected mode is identical with embodiment one with operation principle, does not repeat them here.
Embodiment three
With embodiment one unlike, first transformer has many group vice-side winding N1, N2....Nn, and n is natural constant, often organizes vice-side winding all after voltage multiplying rectifier filter circuit, as the multiple-channel output of isolation voltage stabilizing circuit, provide stable DC voltage to different late-class circuits.Its connected mode is identical with embodiment one with operation principle, does not repeat them here.
Embodiments of the present invention are not limited thereto; according to foregoing of the present invention; utilize ordinary technical knowledge and the customary means of this area; do not departing under the above-mentioned basic thought prerequisite of the present invention; the present invention can also make the amendment of other form, replacement or change, all drops within rights protection scope of the present invention.
Claims (6)
1. isolate the control method of voltage stabilizing circuit for one kind, it is characterized in that: realize the control to isolation voltage stabilizing circuit by boost PFC circuit, civil power is converted into a galvanic current pressure by boost PFC circuit, the former limit winding of the first transformer is as the energy storage inductor in boost PFC circuit, during boost PFC circuit work, the winding two ends, former limit of the first transformer can apply a high-frequency alternating voltage, this voltage arrives secondary by transformer coupled, a high-frequency alternating voltage is produced at vice-side winding two ends, a stable DC voltage is produced after the filtering of voltage-multiplying circuit voltage multiplying rectifier.
2. a kind of control method of isolating voltage stabilizing circuit according to claim 1, is characterized in that: the first described transformer can comprise at least one vice-side winding, produces at least one stable DC voltage supply late-class circuit by above-mentioned control method.
3. the control method of isolation voltage stabilizing circuit according to claim 1, it is characterized in that, components and parts in the former vice-side winding turn ratio of the first described transformer and each road voltage multiplying rectifier filter circuit, can, according to the parameter needing design suitable of late-class circuit, each voltage multiplying rectifier filter circuit be made to export different magnitudes of voltage.
4. isolate a voltage stabilizing circuit, adopt the control method of isolation voltage stabilizing circuit according to claim 1, comprise a boost PFC circuit, it is characterized in that: also comprise the first transformer, at least one voltage multiplying rectifier filter circuit of having one group of vice-side winding at least; The vice-side winding of the first transformer powers at least one road late-class circuit by voltage multiplying rectifier filter circuit.
5. one isolation voltage stabilizing circuit according to claim 4, is characterized in that: described voltage multiplying rectifier filter circuit comprises the first diode, the second diode, the first electric capacity, the second electric capacity; Winding one end, former limit of the first described transformer is just being connected to the output of input rectification circuit, the other end is connected to the anode of the drain electrode of the switching tube of described boost PFC circuit and the fly-wheel diode of described boost PFC circuit, the anode of the first described diode is connected to one end of the first described transformer secondary winding, and the negative electrode of the first described diode is connected to the anode of the second described diode and one end of the first described electric capacity; The other end of the first described electric capacity is connected to the other end of described first transformer secondary winding; The two ends of described second electric capacity connect the anode of the first described diode and the negative electrode of the second described diode respectively, and the two ends of the second described electric capacity are connected respectively to late-class circuit, power to late-class circuit.
6. one isolation voltage stabilizing circuit according to claim 4, it is characterized in that: the former vice-side winding turn ratio of the first described transformer, the parameter of each described voltage multiplying rectifier filter circuit can design separately, according to the magnitude of voltage needing output different of late-class circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510027524.4A CN104617790A (en) | 2015-01-17 | 2015-01-17 | Isolating voltage stabilizing circuit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510027524.4A CN104617790A (en) | 2015-01-17 | 2015-01-17 | Isolating voltage stabilizing circuit and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN104617790A true CN104617790A (en) | 2015-05-13 |
Family
ID=53152115
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510027524.4A Pending CN104617790A (en) | 2015-01-17 | 2015-01-17 | Isolating voltage stabilizing circuit and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453624A (en) * | 2017-07-26 | 2017-12-08 | 广州金升阳科技有限公司 | A kind of auxiliary power supply circuit |
| CN116633169A (en) * | 2023-07-24 | 2023-08-22 | 四川虹锐电工有限责任公司 | System for supplying power in isolation mode and control method |
-
2015
- 2015-01-17 CN CN201510027524.4A patent/CN104617790A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453624A (en) * | 2017-07-26 | 2017-12-08 | 广州金升阳科技有限公司 | A kind of auxiliary power supply circuit |
| CN116633169A (en) * | 2023-07-24 | 2023-08-22 | 四川虹锐电工有限责任公司 | System for supplying power in isolation mode and control method |
| CN116633169B (en) * | 2023-07-24 | 2023-10-20 | 四川虹锐电工有限责任公司 | System for supplying power in isolation mode and control method |
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Application publication date: 20150513 |