CN204068677U - High frequency electric source magnetic bias based on DSP suppresses system - Google Patents
High frequency electric source magnetic bias based on DSP suppresses system Download PDFInfo
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- CN204068677U CN204068677U CN201420163024.4U CN201420163024U CN204068677U CN 204068677 U CN204068677 U CN 204068677U CN 201420163024 U CN201420163024 U CN 201420163024U CN 204068677 U CN204068677 U CN 204068677U
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Abstract
The high frequency electric source magnetic bias that the utility model discloses based on DSP suppresses system.This system comprises DSP control circuit, main power circuit, peak current feedback circuit and output feedack circuit composition; Wherein DSP control circuit is connected with main power circuit, peak current feedback circuit and output feedack circuit respectively, main power circuit is connected with peak current feedback circuit and output feedack circuit, by own analog comparator and the D/A circuit composition peak control mode of DSP control circuit, control power supply and export.Accurately detected transformer bias phenomenon by an other road D/A and analog comparator and processed, magnetic bias of the present utility model suppresses system and control method can detect bias phenomenon in advance and is controlled to eliminate, and reduces design of transformer surplus.
Description
Technical field
The utility model relates to DC power supply converter technique field, and the high frequency electric source magnetic bias be specifically related to based on DSP suppresses system.
Background technology
A kind of control method suppressing magnetic bias of peak value control itself; but relatively high power occasion; especially when design of transformer surplus is less; peak value controls also have bias phenomenon to occur, but the peak control methods of routine, cannot detect that bias phenomenon occurs; and cannot control in advance; until the output of power supply emergent power is abnormal or overcurrent quits work, and this control method just can detect when slight bias phenomenon occurs, and is controlled to eliminate bias phenomenon.
Utility model content
The purpose of this utility model is to provide a kind of high frequency electric source magnetic bias based on DSP to suppress system, can detect the bias phenomenon that power supply is slight and be controlled, thus eliminating bias phenomenon, improving the stability that power supply runs.
For solving the problem, the utility model provides following technical scheme:
High frequency electric source magnetic bias based on DSP suppresses system, comprising: DSP control circuit, main power circuit, peak current feedback circuit and output feedack circuit form; Wherein DSP control circuit is connected with main power circuit, peak current feedback circuit and output feedack circuit respectively, and main power circuit is connected with peak current feedback circuit and output feedack circuit.
Described high frequency electric source is the power supply that DSP peak value controls, DSP control circuit controls according to the output of peak current feedback circuit and output feedack circuit, current peak controls the method adopting slope-compensation simultaneously, the D/A carried with DSP control circuit declines with certain slope and outputs to the analog comparator of DSP control circuit, make comparisons with peak value feedback current and control pulsewidth, control procedure passes through initial value and the descending slope realization of control D/A.
The described high frequency electric source magnetic bias inhibitory control method based on DSP is in control procedure, the maximum of current peak is just at summit " A " point of feedback current waveform, in whole process, peak current exceeds the scope that D/A decline exports, namely represent that peak current is beyond control, show that saturated or bias phenomenon appears in the transformer of main power circuit, can increase by a road D/A to export for this reason, adopt the initial value of a little higher than control, identical descending slope formed one parallel and a little more than D/A control export over-current detection export, when D/A over-current detection exports corresponding comparator output switching activity, show have over-current signal to occur, namely show that magnetic saturation or bias phenomenon appear in the transformer of main power circuit.
The above-mentioned high frequency electric source magnetic bias based on DSP, after DSP control circuit judges over-current phenomenon avoidance according to the output of peak current feedback circuit, dsp processor can judge it is magnetic bias or saturated phenomenon according to over-current phenomenon avoidance, when over-current phenomenon avoidance only occurs on the half-wave of side, bias phenomenon can be judged as, dsp processor is adjusted by PWM dead band, the pulsewidth of two half-waves in fine tuning one-period, thus eliminates bias phenomenon; When detecting that one-period both sides half-wave all occurs over-current phenomenon avoidance, then showing to occur magnetic saturation phenomenon, controlling to reduce power stage one by dsp processor and reducing saturatedly even to eliminate saturated phenomenon, thus ensure that the safe operation of power supply.
As preferably, described dsp processor adopts TMS320f2803X, TMS320f2802X etc. of TI2000 series to carry the chip of analog comparator and D/A, can realize peak value easily and control and over-current detection.
Relative to some present power supply control chips, and the principle that peak value controls, the beneficial effects of the utility model are:
1, adopt TMS320f2803X, TMS320f2802X chip of TI2000 series, this system can not only can be eliminated from control principle for bias phenomenon, and can detect in advance, is controlled.
2, adopt DSP to control, circuit design is simple, with low cost.
3, design of transformer surplus can be reduced, give full play to transformer efficiency.
accompanying drawing illustrates:
Fig. 1 is that the high frequency electric source magnetic bias based on DSP of the present utility model suppresses system block diagram.
Fig. 2 is the example schematic of peak control methods.
Fig. 3 is the example schematic of over-current detection.
Embodiment
Below in conjunction with accompanying drawing, enforcement of the present utility model is further described in detail, but enforcement of the present utility model is not limited thereto.
As shown in Figure 1, the high frequency electric source magnetic bias based on DSP suppresses system, comprising: DSP control circuit, main power circuit, peak current feedback circuit and output feedack circuit form; Wherein DSP control circuit is connected with main power circuit, peak current feedback circuit and output feedack circuit respectively, and main power circuit is connected with peak current feedback circuit and output feedack circuit.
As preferably, the dsp processor of this example adopts TMS320f2803X, TMS320f2802X etc. of TI2000 series to carry the chip of analog comparator and D/A, can realize following peak value easily and control and over-current detection.
Described high frequency electric source is the power supply that DSP peak value controls, DSP control circuit controls according to the output of peak current feedback circuit and output feedack circuit, current peak controls the method adopting slope-compensation simultaneously, the D/A carried with DSP control circuit declines with certain slope and outputs to the analog comparator of DSP control circuit, make comparisons with peak value feedback current and control pulsewidth, control procedure passes through initial value and the descending slope realization of control D/A, and its control method schematic diagram as shown in Figure 2.
The described high frequency electric source magnetic bias inhibitory control method based on DSP is in control procedure, the maximum of current peak is just at summit " A " point of feedback current waveform, in whole process, peak current exceeds the scope that D/A decline exports, namely represent that peak current is beyond control, show that saturated or bias phenomenon appears in the transformer of main power circuit, can increase by a road D/A to export for this reason, adopt the initial value of a little higher than control, identical descending slope formed one parallel and a little more than D/A control export over-current detection export, as shown in Figure 3, when D/A over-current detection exports corresponding comparator output switching activity, show have over-current signal to occur, namely show that magnetic saturation or bias phenomenon appear in the transformer of main power circuit.
The above-mentioned high frequency electric source magnetic bias inhibitory control method based on DSP, after DSP control circuit judges over-current phenomenon avoidance according to the output of peak current feedback circuit, dsp processor can judge it is magnetic bias or saturated phenomenon according to over-current phenomenon avoidance, when over-current phenomenon avoidance only occurs on the half-wave of side, bias phenomenon can be judged as, dsp processor is adjusted by PWM dead band, the pulsewidth of two half-waves in fine tuning one-period, thus eliminates bias phenomenon; When detecting that one-period both sides half-wave all occurs over-current phenomenon avoidance, then showing to occur magnetic saturation phenomenon, controlling to reduce power stage one by dsp processor and reducing saturatedly even to eliminate saturated phenomenon, thus ensure that the safe operation of power supply.
Those skilled in the art can make various amendment to this specific embodiment or supplement or adopt similar mode to substitute under the prerequisite without prejudice to principle of the present utility model and essence, but these changes all fall into protection range of the present utility model.Therefore the utility model technical scope is not limited to above-described embodiment.
Claims (1)
1. the high frequency electric source magnetic bias based on DSP suppresses system, it is characterized in that comprising: DSP control circuit, main power circuit, peak current feedback circuit and output feedack circuit form; Wherein DSP control circuit is connected with main power circuit, peak current feedback circuit and output feedack circuit respectively, and main power circuit is connected with peak current feedback circuit and output feedack circuit; Described dsp processor adopts TMS320f2803X or the TMS320f2802X chip of TI2000 series, and described chip carries analog comparator and D/A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420163024.4U CN204068677U (en) | 2014-04-04 | 2014-04-04 | High frequency electric source magnetic bias based on DSP suppresses system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420163024.4U CN204068677U (en) | 2014-04-04 | 2014-04-04 | High frequency electric source magnetic bias based on DSP suppresses system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204068677U true CN204068677U (en) | 2014-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420163024.4U Expired - Fee Related CN204068677U (en) | 2014-04-04 | 2014-04-04 | High frequency electric source magnetic bias based on DSP suppresses system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204068677U (en) |
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2014
- 2014-04-04 CN CN201420163024.4U patent/CN204068677U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 Termination date: 20170404 |
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| CF01 | Termination of patent right due to non-payment of annual fee |