CN103078505A - Phase-shifted full-bridge power supply module parallel circuit based on digital signal processor (DSP) - Google Patents
Phase-shifted full-bridge power supply module parallel circuit based on digital signal processor (DSP) Download PDFInfo
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Abstract
The invention discloses a phase-shifted full-bridge power supply module parallel circuit based on a digital signal processor (DSP), and the phase-shifted full-bridge power supply module parallel circuit comprises a DSP circuit, a pulse width modulation (PWM) multiplexing and overcurrent protection circuit, a PWM drive circuit, a full-bridge inverter and an output rectification filter circuit; the DSP circuit is connected with the PWM multiplexing and overcurrent protection circuit, and the PWM multiplexing and overcurrent protection circuit is sequentially connected with the PWM drive circuit, the full-bridge inverter and the output rectification filter circuit; and the PWM multiplexing and overcurrent protection circuit is also connected with the full-bridge inverter. Multiple PWM multiplexing and overcurrent protection circuits are shared by two PWM signals, each full-bridge inverter is only provided with two another independent PWM signals, so that the PWM output signal of the DSP can be saved, the control of the DSP for the multiple phase-shifted full bridge is enlarged, parallel output of a phase-shifted full-bridge topological circuit is simply realized, the output capacity is increased, and the control cost is saved.
Description
Technical field
The present invention relates to high-power direct-current switch power source, be specifically related to a kind of phase-shifting full-bridge power module parallel circuits based on DSP.
Background technology
At present, day by day increase in the demand of the various large power supplies of many industries, especially the demand of some high-power DC power supplies.But the DC power supplier finite capacity often adopts the multiple module paralleling operation, its output energy is the several times of module output, improved the power grade of DC power supply, simultaneously multiple module paralleling work makes system have certain redundancy, makes the reliability of whole system that large increase arranged.The multiple module paralleling operation not only makes DC power supply have larger power and reliability, but also has good versatility, and flexible combination becomes the system of various power as required.In this case, now general employing fully independently power module output in parallel comes extended power, independent mutually between the module like this, do not interfere with each other, be beneficial to maintenance and the long-time running of power supply, but control is comparatively complicated, line is more, and in the dynamic property that requires power supply and the higher occasion of synchronism, independently power module is difficult to the requirement that reaches higher, especially when non-constant current output pattern, higher to consistency and the dynamic property requirement of power supply, general module parallel connection is difficult to reach requirement.
Summary of the invention
The object of the present invention is to provide a kind of phase-shifting full-bridge power module parallel circuits based on DSP, circuit is complicated in the existing DC power supply parallel connection, control is loaded down with trivial details to solve, the synchronous problem such as difficult of bad dynamic performance, power supply.The present invention carries out multiplexing to pwm signal, namely a plurality of full-bridge inverters share two-way pwm signal, the PWM output signal of having saved DSP.
The present invention is for achieving the above object, and the technical scheme that adopts is as follows:
A kind of phase-shifting full-bridge power module parallel circuits based on DSP comprises the dsp processor circuit, PWM is multiplexing and current foldback circuit, PWM drive circuit, full-bridge inverter and output rectifier and filter; Wherein said dsp processor circuit and current foldback circuit multiplexing with PWM is connected, and the multiplexing and current foldback circuit of described PWM is connected with PWM drive circuit, full-bridge inverter, output rectifier and filter in turn; Multiplexing and the current foldback circuit of described PWM also is connected with full-bridge inverter.
Further, described full-bridge inverter adopts phase-shift control mode, and its 4 road required pwm signals are produced by the dsp processor circuit, and is amplified to through the PWM drive circuit and is enough to the driving power devices switch.
Further, first via pwm signal PWM1H and the second road pwm signal PWM1L are fixing pwm signal in described 4 road pwm signals, and first via pwm signal PWM1H and the second road pwm signal PWM1L driving brachium pontis are full-bridge inverter the first brachium pontis; Third Road pwm signal PWM2H and the four road pwm signal PWM2L are mobile pwm signal, and it is full-bridge inverter the second brachium pontis that Third Road pwm signal PWM2H and the four road pwm signal PWM2L drive brachium pontis.
Further, described first via pwm signal PWM1H becomes 180 ° of complementary square waves with the second road pwm signal PWM1L, and Third Road pwm signal PWM2H becomes 180 ° of complementary square waves with the four road pwm signal PWM2L.
Further, the angle of flow of described full-bridge inverter the first brachium pontis and full-bridge inverter the second brachium pontis differs a phase place, i.e. phase shifting angle, the output size that the dsp processor circuit is regulated power module by regulating the phase shifting angle size.
Further; the fixedly pwm signal that described PWM is multiplexing and current foldback circuit produces the dsp processor circuit: first via pwm signal PWM1H and the second road pwm signal PWM1L carry out multiplexing; be that a plurality of full-bridge inverters all have a brachium pontis to adopt first via pwm signal PWM1H and the second road pwm signal PWM1L to drive, the another one brachium pontis all adopts separately independently pwm signal.
Further; multiplexing and the current foldback circuit of described PWM is made of four dual inputs and door and a d type flip flop; four dual inputs all are connected with the output Q of d type flip flop with the first input end of door; the first dual input is inputted termination first via pwm signal PWM1H with second of door; the second dual input is inputted termination the second road pwm signal PWM1L with second of door; the 3rd dual input is inputted termination Third Road pwm signal PWM2H with second of door, the second input termination the four road pwm signal PWM2L of the 4th dual input and door.
Further, the input end of clock CLK of described d type flip flop meets first via pwm signal PWM1H; The input D of d type flip flop is connected with clear terminal CLR, and is connected with the overcurrent protection signal; The output Q of d type flip flop also is connected with the dsp processor circuit; When the overcurrent guard signal is input as low level; the clear terminal CLR of d type flip flop is low level; the output Q of d type flip flop is output as low level; four dual inputs and door locked 4 road pwm signals are low level; no matter whether the input of overcurrent protection signal changes in cycle at this pwm signal; the output Q output of d type flip flop is all kept low level until the next rising edge of first via pwm signal PWM1H produces, and the output Q output of d type flip flop is just along with the input of overcurrent protection signal changes.
Further, described dsp processor circuit is counted the driving guard signal number of times of d type flip flop output Q, and when driving the guard signal number of times greater than the set point of dsp processor circuit within the unit interval, the dsp processor circuit locks pwm signal always.
With respect to the prior art scheme, the invention has the beneficial effects as follows:
1, circuit is simple and practical, pwm signal has been carried out multiplexing, and the pwm signal of some can drive more full-bridge inverter, and the pwm signal control of expansion dsp processor circuit has been saved and controlled cost;
2, control method is simple, has realized that in a DSP multimode power supply is in parallel, has omitted communication and central monitoring system between the module.
3, owing to adopting same DSP to control a plurality of phase-shifting full-bridge topological circuits, dynamic performance, consistency, synchronism are in full accord, are fit to various applications.
Description of drawings
Fig. 1 is the phase-shifting full-bridge power module parallel circuits sketch based on DSP of embodiment;
Fig. 2 is that the PWM of the phase shifting control of embodiment drives signal schematic representation;
Fig. 3 is the full-bridge inverter circuit figure of embodiment;
Fig. 4 is the multiplexing and current foldback circuit figure of the PWM of embodiment.
Embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is done further and to be described in detail.
As shown in Figure 1, a kind of phase-shifting full-bridge power module parallel circuits based on DSP comprises dsp processor circuit, three tunnel identical power circuits; The described three tunnel identical every roads of power circuit comprise PWM multiplexing and current foldback circuit, PWM drive circuit, full-bridge inverter and output rectifier and filter; Described dsp processor circuit and current foldback circuit multiplexing with the PWM of three-way power circuit is connected, multiplexing and the current foldback circuit of the PWM of every road power circuit is connected with PWM drive circuit, full-bridge inverter, output rectifier and filter in turn, and the multiplexing and current foldback circuit of PWM also is connected with full-bridge inverter; The output rectifier and filter positive pole of three-way power circuit links together, and negative pole links together, and forms output mode in parallel.
Described full-bridge inverter adopts phase-shift control mode, and the dsp processor circuit produces 8 road pwm signals, and is amplified to through the PWM drive circuit and is enough to the driving power devices switch.
First via pwm signal PWM1H becomes 180 ° of complementary square waves with the second road pwm signal PWM1L in described 8 road pwm signals, Third Road pwm signal PWM2H becomes 180 ° of complementary square waves with the four road pwm signal PWM2L, the five road pwm signal PWM3H becomes 180 ° of complementary square waves with the six road pwm signal PWM3L, and the seven road pwm signal PWM4H becomes 180 ° of complementary square waves with eight-path PWM signal PWM4L; Wherein first via pwm signal PWM1H and the second road pwm signal PWM1L are fixing pwm signal, it drives brachium pontis is full-bridge inverter the first brachium pontis in the power circuit of every road, and namely first via pwm signal PWM1H, the second road pwm signal PWM1L of full-bridge inverter the first brachium pontis in the power circuit of every road are connected to together; It is full-bridge inverter second brachium pontis of first via power circuit that Third Road pwm signal PWM2H and the four road pwm signal PWM2L drive brachium pontis, it is full-bridge inverter second brachium pontis of the No. the second power circuit that the five road pwm signal PWM3H and the six road pwm signal PWM3L drive brachium pontis, and it is full-bridge inverter second brachium pontis of Third Road power circuit that the seven road pwm signal PWM4H and eight-path PWM signal PWM4L drive brachium pontis.
All the other two-way pwm signals of described every road power circuit and first via pwm signal PWM1H or the second road pwm signal PWM1L differ an identical phase place, take first via power circuit as example, as shown in Figure 2, first via pwm signal PWM1H and the four road pwm signal PWM2L be phasic difference θ mutually, and the second road pwm signal PWM1L and Third Road pwm signal PWM2H be phasic difference θ mutually; Be that full-bridge inverter first brachium pontis of every road power circuit and the angle of flow of full-bridge inverter the second brachium pontis differ a phase theta, phase shifting angle namely, the dsp processor circuit is regulated the output size of power module by the size of regulating phase shifting angle θ, its phase shifting angle θ equates during the normal operation of three-way power circuit.
As shown in Figure 3, full-bridge inverter is by the first switching tube Q
1, second switch pipe Q
2, the 3rd switching tube Q
3, the 4th switching tube Q
4With the first diode D
1, the second diode D
2, the 3rd diode D
3, the 4th diode D
4, leakage inductance L
rForm; The first switching tube Q wherein
1By first via pwm signal PWM1H driving, second switch pipe Q
2By the second road pwm signal PWM1L driving, the 3rd switching tube Q
3By Third Road pwm signal PWM2H driving, the 4th switching tube Q
4Driven by the four road pwm signal PWM2L; The first switching tube Q
1With second switch pipe Q
2The place brachium pontis is the first brachium pontis, the 3rd switching tube Q
3With the 4th switching tube Q
4The place brachium pontis is the second brachium pontis.
The fixedly pwm signal that the multiplexing and current foldback circuit of described PWM produces the dsp processor circuit: first via pwm signal PWM1H and the second road pwm signal PWM1L carry out multiplexing, and namely multiplexing the and current foldback circuit of the PWM of three-way power circuit shares first via pwm signal PWM1H and the second road pwm signal PWM1L.
As shown in Figure 4, the multiplexing and current foldback circuit of the PWM of described every road power circuit consists of by four dual inputs and door and a d type flip flop, four dual inputs with first input end all be connected with the output Q of d type flip flop; The PWM of every road power circuit the first dual input multiplexing and current foldback circuit is inputted termination first via pwm signal PWM1H with second of door, the second input termination the second road pwm signal PWM1L of the second dual input and door; The PWM of first via power circuit the 3rd dual input multiplexing and current foldback circuit is inputted termination Third Road pwm signal PWM2H with second of door, the second input termination the four road pwm signal PWM2L of the 4th dual input and door; The PWM of the No. the second power circuit the 3rd dual input multiplexing and current foldback circuit is inputted termination the five road pwm signal PWM3H with second of door, the second input termination the six road pwm signal PWM3L of the 4th dual input and door; The PWM of Third Road power circuit the 3rd dual input multiplexing and current foldback circuit is inputted termination the seven road pwm signal PWM4H with second of door, the second input termination eight-path PWM signal PWM4L of the 4th dual input and door.
The input end of clock CLK of the d type flip flop of described every road power circuit all meets first via pwm signal PWM1H; The output of d type flip flop
Unsettled, preset end PR ground connection; The input D of d type flip flop is connected with clear terminal CLR, and is connected with the overcurrent protection signal; The output Q of d type flip flop also is connected with the dsp processor circuit; When the overcurrent guard signal is input as low level; the clear terminal CLR of d type flip flop is low level; the output Q of d type flip flop is output as low level; four dual inputs and door locked 4 road pwm signals are low level; no matter whether the input of overcurrent protection signal changes in cycle at this pwm signal; the output Q output of d type flip flop is all kept low level until the next rising edge of first via pwm signal PWM1H produces, and the output Q output of d type flip flop is just along with the input of overcurrent protection signal changes.
In the foregoing circuit, dual input can be adopted other dual inputs that can lock output or many inputs and door with door, or door, and NAND gate and NOR gate etc. can form by the logic gates of an input signal locking output, even can pass through CPLD, the hardware such as FPGA are realized.
The dsp processor circuit is counted the driving guard signal number of times of the d type flip flop output Q of every road power circuit; when driving the guard signal number of times greater than the set point of dsp processor circuit within the unit interval, the dsp processor circuit locks the pwm signal of this road power circuit always.
As seen; the above-mentioned phase-shifting full-bridge power module parallel circuits based on DSP; multiplexing and the current foldback circuit of a plurality of PWM has the two-way pwm signal to share; namely a plurality of full-bridge inverters have the two-way pwm signal to share; the two-way pwm signal that is a plurality of full-bridge inverters links together; it is independently that each full-bridge inverter only has other 2 road pwm signals, has saved the PWM output signal of dsp processor.
Those skilled in the art can make various modifications to this specific embodiment or replenish or adopt similar mode to substitute under the prerequisite of principle of the present invention and essence, but these are changed and all fall into protection scope of the present invention.Therefore the technology of the present invention scope is not limited to above-described embodiment.
Claims (9)
1. phase-shifting full-bridge power module parallel circuits based on DSP is characterized in that comprising the dsp processor circuit, PWM is multiplexing and current foldback circuit, PWM drive circuit, full-bridge inverter and output rectifier and filter; Wherein said dsp processor circuit and current foldback circuit multiplexing with PWM is connected, and the multiplexing and current foldback circuit of described PWM is connected with PWM drive circuit, full-bridge inverter, output rectifier and filter in turn; Multiplexing and the current foldback circuit of described PWM also is connected with full-bridge inverter.
2. a kind of phase-shifting full-bridge power module parallel circuits based on DSP according to claim 1, it is characterized in that described full-bridge inverter adopts phase-shift control mode, required 4 road pwm signals of described full-bridge inverter are produced by the dsp processor circuit, and are amplified to through the PWM drive circuit and are enough to the driving power devices switch.
3. a kind of phase-shifting full-bridge power module parallel circuits based on DSP according to claim 2, it is characterized in that in described 4 road pwm signals that first via pwm signal PWM1H and the second road pwm signal PWM1L are fixing pwm signal, first via pwm signal PWM1H and the second road pwm signal PWM1L driving brachium pontis are full-bridge inverter the first brachium pontis; Third Road pwm signal PWM2H and the four road pwm signal PWM2L are mobile pwm signal, and it is full-bridge inverter the second brachium pontis that Third Road pwm signal PWM2H and the four road pwm signal PWM2L drive brachium pontis.
4. a kind of phase-shifting full-bridge power module parallel circuits based on DSP according to claim 3, it is characterized in that described first via pwm signal PWM1H becomes 180 ° of complementary square waves with the second road pwm signal PWM1L, Third Road pwm signal PWM2H becomes 180 ° of complementary square waves with the four road pwm signal PWM2L.
5. a kind of phase-shifting full-bridge power module parallel circuits based on DSP according to claim 3, the angle of flow that it is characterized in that described full-bridge inverter the first brachium pontis and full-bridge inverter the second brachium pontis differs a phase place, be phase shifting angle, the output size that the dsp processor circuit is regulated power module by regulating the phase shifting angle size.
6. a kind of phase-shifting full-bridge power module parallel circuits based on DSP according to claim 3; it is characterized in that the fixedly pwm signal that described PWM is multiplexing and current foldback circuit produces the dsp processor circuit: first via pwm signal PWM1H and the second road pwm signal PWM1L carry out multiplexing; be that a plurality of full-bridge inverters all have a brachium pontis to adopt first via pwm signal PWM1H and the second road pwm signal PWM1L to drive, the another one brachium pontis all adopts separately independently pwm signal.
7. a kind of phase-shifting full-bridge power module parallel circuits based on DSP according to claim 1; it is characterized in that the multiplexing and current foldback circuit of described PWM is made of four dual inputs and door and a d type flip flop; four dual inputs all are connected with the output Q of d type flip flop with the first input end of door; the first dual input is inputted termination first via pwm signal PWM1H with second of door; the second dual input is inputted termination the second road pwm signal PWM1L with second of door; the 3rd dual input is inputted termination Third Road pwm signal PWM2H with second of door, the second input termination the four road pwm signal PWM2L of the 4th dual input and door.
8. a kind of phase-shifting full-bridge power module parallel circuits based on DSP according to claim 7 is characterized in that the input end of clock CLK of described d type flip flop meets first via pwm signal PWM1H; The input D of d type flip flop is connected with clear terminal CLR, and is connected with the overcurrent protection signal; The output Q of d type flip flop also is connected with the dsp processor circuit; When the overcurrent guard signal is input as low level; the clear terminal CLR of d type flip flop is low level; the output Q of d type flip flop is output as low level; four dual inputs and door locked 4 road pwm signals are low level; no matter whether the input of overcurrent protection signal changes in cycle at this pwm signal; the output Q output of d type flip flop is all kept low level until the next rising edge of first via pwm signal PWM1H produces, and the output Q output of d type flip flop is just along with the input of overcurrent protection signal changes.
9. a kind of phase-shifting full-bridge power module parallel circuits based on DSP according to claim 8; it is characterized in that described dsp processor circuit counts the driving guard signal number of times of d type flip flop output Q; when driving the guard signal number of times greater than the set point of dsp processor circuit within the unit interval, the dsp processor circuit locks pwm signal always.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401218A (en) * | 2013-07-31 | 2013-11-20 | 华南理工大学 | CPLD (Complex Programmable Logic Device)-based phase-shifted full bridge over-current self-protection circuit and control method thereof |
| CN109301796A (en) * | 2018-09-29 | 2019-02-01 | 杭州先途电子有限公司 | A kind of PFC current foldback circuit and controller |
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| CN102281010A (en) * | 2010-06-12 | 2011-12-14 | 成都熊谷加世电器有限公司 | High-power single-loop contravariance soft switching arc welding power supply |
| CN102710000A (en) * | 2012-05-21 | 2012-10-03 | 中国电力科学研究院 | Parallel current sharing circuit of charging module of electric automobile charger |
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| US6169677B1 (en) * | 1998-10-15 | 2001-01-02 | Kabushiki Kaisha Toshiba | Power converting system multiplexed with voltage dividing transformers, the voltage transformers, and controller for the system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103401218A (en) * | 2013-07-31 | 2013-11-20 | 华南理工大学 | CPLD (Complex Programmable Logic Device)-based phase-shifted full bridge over-current self-protection circuit and control method thereof |
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| CN109301796A (en) * | 2018-09-29 | 2019-02-01 | 杭州先途电子有限公司 | A kind of PFC current foldback circuit and controller |
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Application publication date: 20130501 |