CN104283427A - Primary side current control method of full-bridge DC-DC converter - Google Patents
Primary side current control method of full-bridge DC-DC converter Download PDFInfo
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- CN104283427A CN104283427A CN201310273236.8A CN201310273236A CN104283427A CN 104283427 A CN104283427 A CN 104283427A CN 201310273236 A CN201310273236 A CN 201310273236A CN 104283427 A CN104283427 A CN 104283427A
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- 238000001914 filtration Methods 0.000 claims abstract description 7
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- 230000007423 decrease Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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Classifications
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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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a primary side current control method of a full-bridge DC-DC converter. According to the primary side current control method, a full-bridge DC-DC converter is adopted. The full-bridge DC-DC converter comprises the components of: an input voltage source, a primary-side current detector, a first bridge arm and a second bridge arm which are composed of four switch devices, a primary-side connecting circuit, a transformer with a magnetizing inductance and a leakage inductance, an auxiliary-side rectifying and filtering circuit, and an output load. Pulse width modulation is performed on the conduction time of a first switch device to a fourth switch device through a full-bridge peak current controller, thereby realizing controlling for the output voltage or output current. Compared with an existing full-bridge control method, the primary side current control method is simpler and has lower cost.
Description
Technical field
The present invention relates to field of switch power, particularly relate to a kind of primary current control method of full-bridge direct current-direct current converter.
Background technology
DC-DC converter adopts voltage mode to control or Controlled in Current Mode and Based usually.The concept that peak-current mode controls derives from the single-ended auto-excitation type reverse exciting switching voltage regulator with primary current defencive function in the later stage sixties 20th century, in the later stage seventies just from academicly making deep Modeling Research; At the initial stage eighties, the appearance of first Controlled in Current Mode and Based PWM integrated circuit (UC3842, UC3846) makes Controlled in Current Mode and Based apply rapidly, is mainly used in single-ended and push-pull circuit.It is that error voltage signal is delivered to PWM comparator that voltage mode controls, and the wavy voltage ramp of the fixed triangle produced with oscillating circuit compares; It is not directly control pwm pulse width with voltage error signal that peak-current mode controls, but directly controls peak current level, thus indirectly controls pwm pulse width.The advantage that peak-current mode controls comprises: transient state closed loop response is very fast, all very fast to the transient response of the change of input voltage and the change of output loading, it is double closed-loop control system that peak-current mode controls, outer voltage controls current inner loop, current inner loop is instantaneous fast according to pulsed operation one by one, power stage is the current source controlled by current inner loop, and outer voltage controls this power stage current source, the input voltage feed forward technology that the adjustment of input voltage can control with voltage mode compares favourably.The advantage that peak-current mode controls also comprises: simple magnetic flux equilibrium function automatically; Instantaneous peak current limitation function, the i.e. inherent intrinsic current-limiting function of pulse one by one; Automatic current equalizing parallel function.
Single-ended and Push-Pull power translation circuit extensively adopts Controlled in Current Mode and Based method, and full bridge power translation circuit generally adopts phase-shifting control method; Phase-shifting control method is a kind of voltage mode control method, does not possess the advantage of Controlled in Current Mode and Based.
Summary of the invention
The object of the invention is the primary current control method proposing a kind of full-bridge direct current-direct current converter, the Controlled in Current Mode and Based method single-ended and Push-Pull power translation circuit extensively adopted is by conversion, obtain the primary current control method of full-bridge direct current-direct current converter, thus full-bridge direct current-direct current converter the is possessed advantage of Controlled in Current Mode and Based.
The present invention adopts full-bridge direct current-direct current converter, and this converter comprises input voltage source, primary current detector, the first brachium pontis of four switching devices composition and the second brachium pontis, former limit connecting circuit, the transformer with magnetizing inductance and leakage inductance, secondary current rectifying and wave filtering circuit, output loading; First brachium pontis is made up of the first switching device and second switch devices in series, the second brachium pontis by the 3rd switching device and the 4th switching device in series, former limit connecting circuit comprises electric capacity and (or) inductance; Input voltage source is connected with two brachium pontis by input direct-current bus, the former limit of transformer is connected with the mid point of the first brachium pontis and the mid point of the second brachium pontis by former limit connecting circuit, the secondary of transformer is connected with current rectifying and wave filtering circuit, in the circuit of primary current detector on input direct-current bus or between the first brachium pontis mid point and the second brachium pontis mid point.Control circuit comprises set point to output voltage, detected value compares the error comparator forming error signal, output controller, former secondary buffer circuit, full-bridge peak current controller.Full-bridge peak current controller determines the duty cycle signals of four switching devices by detecting former limit peak current.
Primary current control method of the present invention: initial time t0 to the second moment t2 is the first delay time; First t1 to the second moment, t2 moment is the first Dead Time; 3rd moment t3 is the first Dead Time to the 4th moment t4; 6th moment t6 is the second delay time to the 8th moment t8; 7th moment t7 is the second Dead Time to the 8th moment t8; 9th moment t9 is the second Dead Time to the tenth moment t10.The front half period, through the first delay time from initial time t0, to the second moment t2, there is the first Dead Time in the first switching device and the 4th switch device conductive, the moment is t1 to t2, and turns off second switch device in the t1 moment before the t2 moment; At the 3rd moment t3, primary current rises to controlling value, turns off the first switching device; Again through the first Dead Time, open second switch device, primary current started to decline from the t2 moment, before first half end cycle, drop to zero.In the later half cycle, through the second delay time from the 6th moment t6, to the 8th moment t8, there is the second Dead Time in the 3rd switching device and second switch break-over of device before the t8 moment, and the moment is t7 to t8, and turn off the 4th switching device in the t7 moment; At the 9th moment t9, primary current rises to controlling value, turns off the 3rd switching device; Again through the second Dead Time, open the 4th switching device, primary current started to decline from the t9 moment, before first half end cycle, drop to zero.
Accompanying drawing explanation
Fig. 1 is the conspectus of the full-bridge direct current-direct current converter adopting control method of the present invention.
Fig. 2 is the main oscillogram in the control signal of the full-bridge direct current-direct current converter breaker in middle device adopting control method of the present invention and converter.
Fig. 1-Fig. 2 designation: V
in-input voltage source, R-primary current detector, 24-former limit peak current, S
1, S
2, S
3, S
4be respectively first, second, third, fourth switching device, 22-first brachium pontis, 23-second brachium pontis, the mid point of A-first brachium pontis, the mid point of B-second brachium pontis, L
r-former limit inductance, T
1-transformer, W
1the former limit winding of-transformer, W
2, W
3the vice-side winding of-transformer, R
1d-output loading, D
r1, D
r2-secondary rectifier diode, C
f-filter capacitor, V
o-output voltage, 40-output voltage set point, 42-output voltage detected value, 45-error signal, 50-error comparator, 36-output controller, the former secondary buffer circuit of 37-, 25-full-bridge peak current controller, D_S1, D_S2, D_S3, D_S4-tetra-switching device (S
1, S
2, S
3, S
4) duty cycle signals.
Embodiment
Fig. 1 is the conspectus of the full-bridge direct current-direct current converter adopting control method of the present invention, and its circuit composition is: this converter comprises input voltage source V
in, primary current detector R, four switching device S
1, S
2, S
3, S
4first brachium pontis 22 of composition and the second brachium pontis 23, former limit connecting circuit (L
rcomposition), there is the transformer T of magnetizing inductance and leakage inductance
1, secondary current rectifying and wave filtering circuit (D
r1, D
r2, C
fcomposition), output loading R
1d; First brachium pontis 22 is by the first switching device S
1with second switch device S
2in series, the second brachium pontis 23 is by the 3rd switching device S
3with the 4th switching device S
4in series, former limit connecting circuit (L
rcomposition) comprise electric capacity and (or) inductance; Input voltage source V
inbe connected with two brachium pontis by input direct-current bus, the former limit W of transformer
1by former limit connecting circuit (L
rcomposition) be connected with the mid point A of the first brachium pontis 22 and the mid point B of the second brachium pontis, the secondary W of transformer
2, W
3with current rectifying and wave filtering circuit (D
r1, D
r2, C
fcomposition) be connected, in the circuit of primary current detector R on input direct-current bus or between the first brachium pontis mid point A and the second brachium pontis mid point B.Control circuit comprises output voltage V
oset point 40, detected value 42 compare the error comparator 50 forming error signal 45, output controller 36, former secondary buffer circuit 37, full-bridge peak current controller 25.Full-bridge peak current controller 25 determines four switching device S by detecting former limit peak current 24
1, S
2, S
3, S
4duty cycle signals D_S1, D_S2, D_S3, D_S4.
The course of work as shown in Figure 2.DSP is adopted to control, set the first delay time, the first Dead Time, the second delay time, the second Dead Time in dsp, and use DSP to calculate time interval size t_01 that the first delay time deducts the first Dead Time, and the second delay time deducts the time interval size t_02 of the second Dead Time.The front half period, from initial time t0, arrive the first moment t1 through t_01, turn off second switch device; Again through the first Dead Time to the second moment t2, the second moment t2 starts the first switching device and the 4th switch device conductive, inductive current rise; At the 3rd moment t3, primary current rises to controlling value, turns off the first switching device; Again through the first Dead Time, open second switch device, primary current started to decline from the t2 moment, before first half end cycle, drop to zero.In the later half cycle, from the 6th moment t6, arrive the 7th moment t7 through t_02, turn off the 4th switching device; Again through the second Dead Time to the 8th moment t8, the 8th moment t8 starts the 3rd switching device and second switch break-over of device, inductive current rise; Rise to controlling value at the 9th moment t9 primary current, turn off the 3rd switching device; Again through the second Dead Time, open the 4th switching device, primary current started to decline from the t9 moment, before later half end cycle, drop to zero.
Claims (5)
1. a primary current control method for full-bridge direct current-direct current converter, the method adopts full-bridge direct current-direct current converter, and this converter comprises input voltage source (V
in), primary current detector (R), four switching device (S
1, S
2, S
3, S
4) the first brachium pontis (22) of forming and the second brachium pontis (23), former limit connecting circuit, there is the transformer (T of magnetizing inductance and leakage inductance
1), secondary current rectifying and wave filtering circuit (D
r1, D
r2, C
fcomposition), output loading (R
1d); First brachium pontis (22) is by the first switching device (S
1) and second switch device (S
2) in series, the second brachium pontis (23) is by the 3rd switching device (S
3) and the 4th switching device (S
4) in series, former limit connecting circuit (L
rcomposition) comprise electric capacity and (or) inductance; Input voltage source (V
in) be connected with two brachium pontis by input direct-current bus, the former limit (W of transformer
1) by former limit connecting circuit (L
rcomposition) be connected with the mid point (A) of the first brachium pontis (22) and the mid point (B) of the second brachium pontis, the secondary (W of transformer
2, W
3) and current rectifying and wave filtering circuit (D
r1, D
r2, C
fcomposition) be connected, primary current detector (R) is arranged in the circuit on input direct-current bus or between the first brachium pontis mid point (A) and the second brachium pontis mid point (B); Control circuit comprises output voltage (V
o) set point (40), detected value (42) compare the error comparator (50) forming error signal (45), output controller (36), former secondary buffer circuit (37), full-bridge peak current controller (25); Full-bridge peak current controller (25) determines four switching device (S by detecting former limit peak current (24)
1, S
2, S
3, S
4) duty cycle signals (D_S1, D_S2, D_S3, D_S4); It is characterized in that, this control method carries out pulse-width modulation by a full-bridge peak current controller to the ON time of first to fourth switching device, realizes the control to output voltage or electric current.
2. the primary current control method of full-bridge direct current-direct current converter as claimed in claim 1, it is characterized in that, a switch periods can be divided equally for front half period and later half cycle in time, described first switching device turns on and off in the front half period and each once, in the later half cycle keeps off state, the 3rd described switching device the front half period keep off state, the later half cycle turn on and off each once; First switching device is open-minded after the first delay time in front start time half period, and the 3rd switching device is open-minded after the second delay time in later half start time in cycle.
3. the primary current control method of full-bridge direct current-direct current converter as claimed in claim 1, it is characterized in that, the control signal of the first switching device becomes complementary relationship with the control signal of second switch device, has the first Dead Time between the ON time of the first switching device and the ON time of second switch device; The control signal of the 3rd switching device becomes complementary relationship with the control signal of the 4th switching device, has the second Dead Time between the ON time of the 3rd switching device and the ON time of the 4th switching device.
4. the primary current control method of full-bridge direct current-direct current converter as claimed in claim 1, it is characterized in that, output voltage and/or electric current pass through the adjustment of output controller and the transmission of former secondary isolation circuit, enter full-bridge peak current controller, obtain the set-point of former limit peak-current signal; First switching device was determined by full-bridge peak current controller in the shutoff moment in later half cycle in shutoff moment of front half period and the 3rd switching device; The current signal absolute value detected when primary current detector reaches the set-point of former limit peak-current signal, then turn off corresponding switching device, that is, turn off the first switching device in the front half period, turn off the 3rd switching device in the later half cycle; Finish time current half-cycle phase or later half finish time in cycle, the current signal absolute value that primary current detector detects still is less than the set-point of former limit peak-current signal, then turn off corresponding switching device, that is, the first switching device is turned off, at later half cycle shutoff the 3rd switching device in the front half period.
5. the primary current control method of full-bridge direct current-direct current converter as claimed in claim 1, it is characterized in that, due to the impact of distributed constant in circuit, in the ordinary course of things, the ON time of the first switching device and the ON time of the 3rd switching device are unequal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310273236.8A CN104283427A (en) | 2013-07-02 | 2013-07-02 | Primary side current control method of full-bridge DC-DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310273236.8A CN104283427A (en) | 2013-07-02 | 2013-07-02 | Primary side current control method of full-bridge DC-DC converter |
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| Publication Number | Publication Date |
|---|---|
| CN104283427A true CN104283427A (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967320A (en) * | 2015-06-10 | 2015-10-07 | 无锡中汇汽车电子科技有限公司 | Control method of full-bridge converter of asymmetric duty ratios |
| CN105988496A (en) * | 2015-02-10 | 2016-10-05 | 杨宏 | Digital current control device |
| CN113114171A (en) * | 2021-04-14 | 2021-07-13 | 西安理工大学 | Current source pulse control method for micro-arc oxidation |
| CN113644827A (en) * | 2021-08-13 | 2021-11-12 | 珠海格力电器股份有限公司 | Control method of DC/DC power converter and air conditioner |
| CN113794378A (en) * | 2018-09-26 | 2021-12-14 | 台达电子工业股份有限公司 | Conversion device |
-
2013
- 2013-07-02 CN CN201310273236.8A patent/CN104283427A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105988496A (en) * | 2015-02-10 | 2016-10-05 | 杨宏 | Digital current control device |
| CN104967320A (en) * | 2015-06-10 | 2015-10-07 | 无锡中汇汽车电子科技有限公司 | Control method of full-bridge converter of asymmetric duty ratios |
| CN104967320B (en) * | 2015-06-10 | 2017-10-24 | 无锡中汇汽车电子科技有限公司 | A kind of full-bridge converter control method of asymmetric dutycycle |
| CN113794378A (en) * | 2018-09-26 | 2021-12-14 | 台达电子工业股份有限公司 | Conversion device |
| CN113794378B (en) * | 2018-09-26 | 2023-11-24 | 台达电子工业股份有限公司 | conversion device |
| CN113114171A (en) * | 2021-04-14 | 2021-07-13 | 西安理工大学 | Current source pulse control method for micro-arc oxidation |
| CN113114171B (en) * | 2021-04-14 | 2024-01-12 | 西安理工大学 | Current source pulse control method for micro-arc oxidation |
| CN113644827A (en) * | 2021-08-13 | 2021-11-12 | 珠海格力电器股份有限公司 | Control method of DC/DC power converter and air conditioner |
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