CN101227148B - Implementation circuit for alternate phase multiple operation of active clamp circuit - Google Patents
Implementation circuit for alternate phase multiple operation of active clamp circuit Download PDFInfo
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- CN101227148B CN101227148B CN2007101245699A CN200710124569A CN101227148B CN 101227148 B CN101227148 B CN 101227148B CN 2007101245699 A CN2007101245699 A CN 2007101245699A CN 200710124569 A CN200710124569 A CN 200710124569A CN 101227148 B CN101227148 B CN 101227148B
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Abstract
The invention discloses a method for operating fault phases in parallel of an active clamp circuit and a realizing circuit, wherein the realizing circuit comprises a controlling IC, a driving circuit A, a driving circuit B, an active clamp circuit A, an active clamp circuit B and an output circuit, wherein the controlling IC is respectively connected with the driving circuit A and the driving circuit B, a pair of PWM controlling signals which are the fault phases for 180 degrees are output to the driving circuit A and the driving circuit B, the active clamp circuit A and the active clamp circuit B are respectively controlled by the driving circuit A and the driving circuit B, and the active clamp circuit A and the active clamp circuit B which are fault phases are connected with the output circuit in parallel. An active clamp fault phase 180-degree PWM structure which controls double circuits and is directly connected in parallel to operate the circuits in the invention is particularly applied to large power (low voltage great current output) power supply, the filtering circuit has small ripple currents, high reliability, easy realization and low cost, simultaneously since two circuits are operated on a fault phase, heat design becomes greatly simple, current sharing function can be automatically realized, and the current sharing degree is good.
Description
Technical field
The present invention relates to electric and electronic technical field, relate in particular to a kind of realization circuit of alternate phase multiple operation of active clamp circuit.
Background technology
Relate to a lot of topological structures in the design of Switching Power Supply at present, comprising the most basic several circuit topological structures such as anti-sharp, normal shock, half-bridge, full-bridges, these circuit are each has something to recommend him in the practical project technology is used, and particularly are applied on the powerful power supply.For example on hybrid vehicle, a powerful DC/DC (about about 1.5KW) is arranged, as being similar to sort circuit, normal shock, anti-swash just be not suitable for, we adopt the circuit of half-bridge and full-bridge mostly, but half-bridge and full-bridge circuit also have its shortcoming, and bad such as the underloading characteristic, cost is more high.
Existing for large power supply, the power supply of low-voltage, high-current particularly, the main method that solves still is full-bridge or half-bridge circuit at present, and topology commonly used is full-bridge phase shifting or resonant circuit:
One, full-bridge phase shifting circuit
As shown in Figure 1, the full-bridge phase shifting circuit generally uses in the communication power supply field at present, and on the high power D C/DC of hybrid vehicle, basic employing also is this type of circuit in the industry.
The advantage of this full-bridge phase shifting circuit is that switching tube has been realized ZVS, and switching loss is little, can realize high frequencyization; Control is simple, but the constant frequency operation.The ZVS condition was difficult to satisfy when shortcoming was underloading, and there is big circulation on former limit, and output diode can not be realized zero switch.In addition, the cost of its control IC is also very high.。
Two, resonant circuit
Resonant circuit is divided into half-bridge resonance and full-bridge resonance, and its basic principle is the same.As shown in Figure 2, be the full-bridge resonant circuit, the characteristics of sort circuit are switching tube gamut ZVS, and output diode is a zero-current switching; And its primary current waveform is basic near sinusoidal, so its EMC is also little.Shortcoming is that its no-load characteristic is bad, and the higher problem that also can bring drive circuit of frequency ratio; The IC cost that contains high-side driver equally at present is also than higher.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of realization circuit of alternate phase multiple operation of active clamp circuit.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions.
A kind of method of alternate phase multiple operation of active clamp circuit, export the pwm control signal of 180 ° of a pair of misphases by control chip IC, behind overdrive circuit A and drive circuit B, control active clamp circuit A and active clamp circuit B respectively, the active clamp circuit A of two-way misphase and active clamp circuit B output in parallel again.
A kind of realization circuit of alternate phase multiple operation of active clamp circuit comprises control IC, drive circuit A, drive circuit B, active clamp circuit A, active clamp circuit B, output circuit; Control IC links to each other with drive circuit A, drive circuit B respectively, the pwm control signal of exporting 180 ° of a pair of misphases is to drive circuit A and drive circuit B, control active clamp circuit A and active clamp circuit B respectively by drive circuit A and drive circuit B, the active clamp circuit A and the active clamp circuit B of two-way misphase are parallel to output circuit again.
Wherein, described active clamp circuit A comprises first main switch (Q2), the first auxiliary switch pipe (Q1), first clamp capacitor (C1), first transformer (T1), first rectifier diode (D1), second rectifier diode (D2), the output that the grid of the grid of described first main switch (Q2), source electrode and the first auxiliary switch pipe (Q1), source electrode meet drive circuit A respectively; The former limit of described first transformer (T1) links to each other with the drain electrode of the first auxiliary switch pipe (Q1) and the drain electrode of first main switch (Q2) respectively, and the source electrode of the described first auxiliary switch pipe (Q1) links to each other with the drain electrode of first main switch (Q2) by first clamp capacitor (C1); The drain electrode of the described first auxiliary switch pipe (Q1) connects power input (Vin+), the source ground of described first main switch (Q2); Described first rectifier diode (D1) and second rectifier diode (D2) anode connect the secondary of first transformer (T1) respectively, and its negative electrode links to each other; The secondary centre cap of described first transformer (T1) and first rectifier diode (D1) and second rectifier diode (D2) negative electrode connect output circuit;
Described active clamp circuit B comprises second main switch (Q4), the second auxiliary switch pipe (Q3), second clamp capacitor (C2), second transformer (T2), the 3rd rectifier diode (D3), the 4th rectifier diode (D4), the output that the grid of the grid of described second main switch (Q4), source electrode and the second auxiliary switch pipe (Q3), source electrode meet drive circuit B respectively; The former limit of described second transformer (T2) links to each other with the drain electrode of the second auxiliary switch pipe (Q3) and the drain electrode of second main switch (Q4) respectively, and the source electrode of the described second auxiliary switch pipe (Q3) links to each other with the drain electrode of second main switch (Q4) by second clamp capacitor (C2); The drain electrode of the described second auxiliary switch pipe (Q3) connects power input (Vin+), the source ground of described second main switch (Q4); Described the 3rd rectifier diode (D3) and the 4th rectifier diode (D4) anode connect the secondary of second transformer (T2) respectively, and its negative electrode links to each other; The secondary centre cap of described second transformer (T2) and the 3rd rectifier diode (D3) and the 4th rectifier diode (D4) negative electrode connect output circuit.
Wherein, output circuit comprises first inductance (L1), second inductance (L2), filter capacitor (C3), one end of described first inductance (L1) links to each other with second rectifier diode (D2) negative electrode with first rectifier diode (D1), and the other end links to each other with the 4th rectifier diode (D4) negative electrode with the 3rd rectifier diode (D3) by second inductance (L2); One end of described filter capacitor (C3) links to each other with the mid point of first inductance (L1) with second inductance (L2), and the other end links to each other with the secondary centre cap of first transformer (T1) with second transformer (T2), and described filter capacitor (C3) is connected in parallel on output.
The present invention proposes the structure of 180 ° of direct parallel running circuit of PWM control two-way of a kind of active clamp misphase, be particularly suitable for high-power (low-voltage, high-current output) power supply, its filter circuit ripple current is minimum, the reliability height, realize simply, with low cost, simultaneously owing to be the operation of two-way misphase, it is very simple that thermal design just becomes, and can realize flow equalizing function automatically, all mobility is good.
Description of drawings
Fig. 1 is existing full-bridge phase shifting circuit theory diagrams;
Fig. 2 is existing resonant circuit schematic diagram;
Fig. 3 is a schematic block circuit diagram of the present invention;
Fig. 4 realizes schematic diagram for physical circuit of the present invention.
Embodiment
Core concept of the present invention is: the present invention exports the pwm control signal of 180 ° of a pair of misphases by control chip IC, behind overdrive circuit A and drive circuit B, control active clamp circuit A and active clamp circuit B respectively, the active clamp circuit A of two-way misphase and active clamp circuit B output in parallel again.
For ease of the present invention is further understood, now reach specific embodiment in conjunction with the accompanying drawings and describe the present invention.
See also shown in Figure 3ly, comprise control IC, drive circuit A, drive circuit B, active clamp circuit A, active clamp circuit B, output circuit; Control IC links to each other with drive circuit A, drive circuit B respectively, the pwm control signal of exporting 180 ° of a pair of misphases is to drive circuit A and drive circuit B, control active clamp circuit A and active clamp circuit B respectively by drive circuit A and drive circuit B, the active clamp circuit A and the active clamp circuit B of two-way misphase are parallel to output circuit again.
As shown in Figure 4, comprise PWM control IC 301, drive circuit A 3021, drive circuit B 3022, active clamp circuit A 3031, active clamp circuit B 3032, output circuit 304; PWM control IC 301 links to each other with drive circuit A 3021, drive circuit B 3022 respectively, and drive circuit A 3021 and drive circuit B 3022 are parallel to output circuit 304 after driving active clamp circuit A 3031 and active clamp circuit B 3032 respectively.
Active clamp circuit A 3031 comprises the first main switch Q2, the first auxiliary switch pipe Q1, the first clamp capacitor C1, the first transformer T1, the first rectifier diode D1, the second rectifier diode D2, the output that the grid of the grid of the described first main switch Q2, source electrode and the first auxiliary switch pipe Q1, source electrode meet drive circuit A 3021 respectively; The former limit of the described first transformer T1 links to each other with the drain electrode of the first auxiliary switch pipe Q1 and the drain electrode of the first main switch Q2 respectively, and the source electrode of the described first auxiliary switch pipe Q1 links to each other with the drain electrode of the first main switch Q2 by the first clamp capacitor C1; The drain electrode of the described first auxiliary switch pipe Q1 meets power input Vin+, the source ground of the described first main switch Q2; The described first rectifier diode D1 and the second rectifier diode D2 anode connect the secondary of the first transformer T1 respectively, and its negative electrode links to each other; The secondary centre cap of the described first transformer T1 and the first rectifier diode D1 and the second rectifier diode D2 negative electrode connect output circuit 403.
Active clamp circuit B 3032 comprises the second main switch Q4, the second auxiliary switch pipe Q3, the second clamp capacitor C2, the second transformer T2, the 3rd rectifier diode D3, the 4th rectifier diode D4, the output that the grid of the grid of the described second main switch Q4, source electrode and the second auxiliary switch pipe Q3, source electrode meet drive circuit B 3022 respectively; The former limit of the described second transformer T2 links to each other with the drain electrode of the second auxiliary switch pipe Q3 and the drain electrode of the second main switch Q4 respectively, and the source electrode of the described second auxiliary switch pipe Q3 links to each other with the drain electrode of the second main switch Q4 by the second clamp capacitor C2; The drain electrode of the described second auxiliary switch pipe Q3 meets power input Vin+, the source ground of the described second main switch Q4; Described the 3rd rectifier diode D3 and the 4th rectifier diode D4 anode connect the secondary of the second transformer T2 respectively, and its negative electrode links to each other; The secondary centre cap of the described second transformer T2 and the 3rd rectifier diode D3 and the 4th rectifier diode D4 negative electrode connect output circuit 403.
The PWM control IC is example with UC3825 among the present invention, and its pulse-width signal OutA and OutB signal are respectively pwm signal PWMA and the PWMB that the PWM control IC is sent symmetry, through overdrive circuit A and drive circuit B, and driven MOS pipe Q1, Q2, Q3, Q4.Q2 and Q4 metal-oxide-semiconductor are defined as main switch, and Q1 and Q3 metal-oxide-semiconductor are defined as the auxiliary switch pipe.C1 and C2 are clamp capacitor, and T1 and T2 are main transformer, and D1, D2, D3, D4 are rectifier diode, and L1 and L2 are outputting inductance, and C3 is a filter capacitor.
Its operation principle is as follows:
Behind the UC3825 chip power, PWMA and PWMB meeting output drive signal, suppose that the PWMA signal is high level earlier, then Q2 main switch no-voltage conducting, D1 diode forward conducts energy is sent to secondary simultaneously, be the high level interval at the PWMA signal simultaneously, Q3 auxiliary switch pipe also is open-minded, also is transformer T2 degaussing process, simultaneously output diode D4 forward conduction, energy is provided also for the outlet side afterflow, for opening of next cycle main switch provides zero voltage condition.Main switch Q2 driving pulse turn-offs then, and through suitable time-delay setting, at this moment auxiliary switch pipe Q1 begins conducting, and the T1 degaussing process begins, and simultaneously also for load provides energy, next cycle begins again, so continuous circulation.
More than to the method for the alternate phase multiple operation of a kind of active clamp circuit provided by the present invention and realize that circuit is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (2)
1. the realization circuit of the alternate phase multiple operation of an active clamp circuit is characterized in that, comprises control IC, drive circuit A, drive circuit B, active clamp circuit A, active clamp circuit B, output circuit; Control IC links to each other with drive circuit A, drive circuit B respectively, the pwm control signal of exporting 180 ° of a pair of misphases is to drive circuit A and drive circuit B, control active clamp circuit A and active clamp circuit B respectively by drive circuit A and drive circuit B, the active clamp circuit A and the active clamp circuit B of two-way misphase are parallel to output circuit again;
Described active clamp circuit A comprises first main switch (Q2), the first auxiliary switch pipe (Q1), first clamp capacitor (C1), first transformer (T1), first rectifier diode (D1), second rectifier diode (D2), the output that the grid of the grid of described first main switch (Q2), source electrode and the first auxiliary switch pipe (Q1), source electrode meet drive circuit A respectively; The former limit of described first transformer (T1) links to each other with the drain electrode of the first auxiliary switch pipe (Q1) and the drain electrode of first main switch (Q2) respectively, and the source electrode of the described first auxiliary switch pipe (Q1) links to each other with the drain electrode of first main switch (Q2) by first clamp capacitor (C1); The drain electrode of the described first auxiliary switch pipe (Q1) connects power input (Vin+), the source ground of described first main switch (Q2); Described first rectifier diode (D1) and second rectifier diode (D2) anode connect the secondary of first transformer (T1) respectively, and its negative electrode links to each other; The secondary centre cap of described first transformer (T1) and first rectifier diode (D1) and second rectifier diode (D2) negative electrode connect output circuit;
Described active clamp circuit B comprises second main switch (Q4), the second auxiliary switch pipe (Q3), second clamp capacitor (C2), second transformer (T2), the 3rd rectifier diode (D3), the 4th rectifier diode (D4), the output that the grid of the grid of described second main switch (Q4), source electrode and the second auxiliary switch pipe (Q3), source electrode meet drive circuit B respectively; The former limit of described second transformer (T2) links to each other with the drain electrode of the second auxiliary switch pipe (Q3) and the drain electrode of second main switch (Q4) respectively, and the source electrode of the described second auxiliary switch pipe (Q3) links to each other with the drain electrode of second main switch (Q4) by second clamp capacitor (C2); The drain electrode of the described second auxiliary switch pipe (Q3) connects power input (Vin+), the source ground of described second main switch (Q4); Described the 3rd rectifier diode (D3) and the 4th rectifier diode (D4) anode connect the secondary of second transformer (T2) respectively, and its negative electrode links to each other; The secondary centre cap of described second transformer (T2) and the 3rd rectifier diode (D3) and the 4th rectifier diode (D4) negative electrode connect output circuit.
2. the realization circuit of the alternate phase multiple operation of active clamp circuit according to claim 1, it is characterized in that, output circuit comprises first inductance (L1), second inductance (L2), filter capacitor (C3), one end of described first inductance (L1) links to each other with second rectifier diode (D2) negative electrode with first rectifier diode (D1), and the other end links to each other with the 4th rectifier diode (D4) negative electrode with the 3rd rectifier diode (D3) by second inductance (L2); One end of described filter capacitor (C3) links to each other with the mid point of first inductance (L1) with second inductance (L2), and the other end links to each other with the secondary centre cap of first transformer (T1) with second transformer (T2), and described filter capacitor (C3) is connected in parallel on output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101245699A CN101227148B (en) | 2007-11-16 | 2007-11-16 | Implementation circuit for alternate phase multiple operation of active clamp circuit |
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| CN2007101245699A CN101227148B (en) | 2007-11-16 | 2007-11-16 | Implementation circuit for alternate phase multiple operation of active clamp circuit |
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| CN101227148A CN101227148A (en) | 2008-07-23 |
| CN101227148B true CN101227148B (en) | 2011-05-18 |
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Denomination of invention: A realization circuit of out-of-phase parallel operation of an active clamp circuit Effective date of registration: 20220920 Granted publication date: 20110518 Pledgee: Shenzhen hi tech investment small loan Co.,Ltd. Pledgor: SHINRY TECHNOLOGIES Co.,Ltd. Registration number: Y2022980015797 |
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