CN101771360A - Dynamic magnetic balance regulating circuit in switching power supply and switching power supply - Google Patents
Dynamic magnetic balance regulating circuit in switching power supply and switching power supply Download PDFInfo
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- CN101771360A CN101771360A CN 201010119167 CN201010119167A CN101771360A CN 101771360 A CN101771360 A CN 101771360A CN 201010119167 CN201010119167 CN 201010119167 CN 201010119167 A CN201010119167 A CN 201010119167A CN 101771360 A CN101771360 A CN 101771360A
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Abstract
The invention provides a dynamic magnetic balance regulating circuit in a switching power supply and the switching power supply. The regulating circuit of the invention is applied to a half-bridge inverter circuit and comprises a first sampling unit, a second sampling unit, a comparing unit and a control unit, wherein the first sampling unit is used for collecting midpoint voltage of an upper bridge arm and a lower bridge arm of the half bridge inverter circuit and sending the midpoint voltage to the comparing unit; the second sampling unit is used for collecting midpoint values of rectified voltage and sending the midpoint values to the comparing unit; the comparing unit is used for comparing the midpoint voltage and the midpoint value and sending the comparing result to the control unit; when the comparing result is that the midpoint voltage is larger than the midpoint values, the control unit is used for reducing the duty ratio of pulse for driving a switching tube of the upper bridge arm until the midpoint voltage is equal to the midpoint values; and when the comparing result is that the midpoint voltage is less than the midpoint values, the control unit is used for reducing the duty ratio of pulse for driving a switching tube of the lower bridge arm until the midpoint voltage is equal to the midpoint values. The regulating circuit of the invention can effectively regulate magnetic biasing and improve the working reliability.
Description
Technical field
The present invention relates to magnetic balance adjustment technology field, dynamic magnetic balance regulating circuit and Switching Power Supply in particularly a kind of Switching Power Supply.
Background technology
It is little that Switching Power Supply has a volume, and therefore the advantage that efficient height and electric current are big is widely used in occasions such as charger for mobile phone and notebook adapter.
All can produce magnetic bias in the inverter circuit of Switching Power Supply, below simple introduce the reason that bias phenomenon down produces.Referring to Fig. 1, this figure is the adjustment circuit that solves magnetic bias in the prior art.Wherein, four switching tube IGBT1, IGBT2, IGBT3 and IGBT lay respectively on four brachium pontis, and diode of each switching tube reverse parallel connection.
Because the time of four switching tube conductings in the full bridge inverter is inconsistent, magnetic hysteresis can not be offset fully like this, and causing has DC component in the transformer.When DC component runs up to a certain degree, can cause the unshakable in one's determination saturated of transformer.
At present, the method for solution magnetic bias is capacitor C of series connection on the elementary winding of transformer.When full bridge inverter is worked, the switching tube closure that capacitor C is intersected up and down.At this moment, the magnetic bias that produces in the circuit can solve by capacitor C, because capacitor C has every straight effect.
Though this method is simple, also there is shortcoming.In several switch periods, capacitor C can play good effect every straight anti-magnetic bias, but from the long-term work of full bridge inverter, anti-in this way magnetic bias is not thorough.Because capacitor C can be distributed DC component unnecessary in the transformer, but be not balanced fully each the distribution, so it is difficult to eliminate the accumulation of long-term direct current electric charge.When the direct current electric charge is accumulated to a certain degree, can produce new magnetic flux imbalance, cause the unshakable in one's determination saturated of transformer.At this moment inverter circuit will damage, this also just Switching Power Supply the main cause of an intrinsic probability of damage is arranged.
Summary of the invention
The technical problem to be solved in the present invention is dynamic magnetic balance regulating circuit and a Switching Power Supply in a kind of Switching Power Supply, can effectively adjust magnetic bias, improves functional reliability.
The invention provides dynamic magnetic balance regulating circuit in a kind of Switching Power Supply, be applied to comprise in the half-bridge inversion circuit: first sampling unit, second sampling unit, comparing unit and control unit;
Described first sampling unit is used to gather the mid-point voltage of the upper and lower bridge arm of half-bridge inversion circuit, and this mid-point voltage is sent to described comparing unit;
Described second sampling unit is used to gather the midrange of voltage after the rectification, and this midrange is sent to described comparing unit;
Comparing unit is used for described mid-point voltage and midrange are compared, and comparative result is sent to described control unit;
Described control unit when described comparative result is a described mid-point voltage during greater than described midrange, is used to reduce to drive the duty of ratio of brachium pontis switching tube, equals described midrange up to described mid-point voltage; When described comparative result is a described mid-point voltage during less than described midrange, be used to reduce to drive down the duty of ratio of brachium pontis switching tube, equal described midrange up to described mid-point voltage.
Preferably, described comparing unit comprises first voltage comparator, second voltage comparator and tertiary voltage comparator;
Described mid-point voltage is imported the negative input end of described first voltage comparator, and described midrange is imported the positive input terminal of described first voltage comparator;
The output of described first voltage comparator connects the negative input end of described second voltage comparator; The positive input terminal of described second voltage comparator connects reference voltage; The output of described second voltage comparator connects the first input end of described control unit by resistance;
The output of described second voltage comparator connects the negative input end of described tertiary voltage comparator; The positive input terminal of described tertiary voltage comparator connects described reference voltage; The output of described tertiary voltage comparator connects second input of described control unit by resistance.
Preferably, described control unit comprises main control chip and shaping chip for driving;
The first input end of the described shaping chip for driving of input after first output of described main control chip and the stack of the first input end signal of described control unit;
Second input of the described shaping chip for driving of input after second output of described main control chip and the stack of second input end signal of described control unit;
First output end signal of described shaping chip for driving is as driving the pulse of going up the brachium pontis switching tube;
Second output end signal of described shaping chip for driving is as driving the pulse of brachium pontis switching tube down.
Preferably, described first sampling unit comprises the first brachium pontis electric capacity and the second brachium pontis electric capacity that the appearance value is identical, and is in parallel with the upper and lower bridge arm of described half-bridge inversion circuit after the described first brachium pontis electric capacity and the second brachium pontis capacitances in series;
Described mid-point voltage is the voltage of the common port of the described first brachium pontis electric capacity and the second brachium pontis electric capacity.
Preferably, described second sampling unit comprises first resistance and second resistance that resistance is identical, and described first resistance and second resistance series connection back are in parallel with the upper and lower bridge arm of described half-bridge inversion circuit;
Described midrange is the voltage of the common port of described first resistance and second resistance.
The present invention also provides dynamic magnetic balance regulating circuit in a kind of Switching Power Supply, is applied to comprise in the full bridge inverter: first sampling unit, second sampling unit, comparing unit and control unit;
Described first sampling unit is used for gathering the capacitance voltage at full bridge inverter capacitance two ends, and this capacitance voltage is sent to described comparing unit;
Described second sampling unit is used to gather the midrange of voltage after the rectification, and this midrange is sent to described comparing unit;
Comparing unit is used for described capacitance voltage and midrange are compared, and comparative result is sent to described control unit;
Described control unit when described comparative result is a described capacitance voltage during greater than described midrange, is used to reduce to drive the duty of ratio of upper right switching tube and lower-left switching tube, equals described midrange up to described capacitance voltage; When described comparative result is a described capacitance voltage during less than described midrange, be used to reduce to drive the duty of ratio of upper left switching tube and bottom right switching tube, equal described midrange up to described capacitance voltage.
Preferably, described comparing unit comprises first voltage comparator, second voltage comparator and tertiary voltage comparator;
Described capacitance voltage is imported the negative input end of described first voltage comparator, and described midrange is imported the positive input terminal of described first voltage comparator;
The output of described first voltage comparator connects the negative input end of described second voltage comparator; The positive input terminal of described second voltage comparator connects reference voltage; The output of described second voltage comparator connects the first input end of described control unit by resistance;
The output of described second voltage comparator connects the negative input end of described tertiary voltage comparator; The positive input terminal of described tertiary voltage comparator connects described reference voltage; The output of described tertiary voltage comparator connects second input of described control unit by resistance.
Preferably, described control unit comprises main control chip and shaping chip for driving;
The first input end of the described shaping chip for driving of input after first output of described main control chip and the stack of the first input end signal of described control unit;
Second input of the described shaping chip for driving of input after second output of described main control chip and the stack of second input end signal of described control unit;
First output end signal of described shaping chip for driving is as the pulse that drives upper right switching tube and lower-left switching tube;
Second output end signal of described shaping chip for driving is as the pulse that drives upper left switching tube and bottom right switching tube.
Preferably, described second sampling unit comprises first resistance and second resistance that resistance is identical, and described first resistance and second resistance series connection back are in parallel with described upper and lower bridge arm;
Described midrange is the voltage of the common port of described first resistance and second resistance.
The embodiment of the invention also provides a kind of Switching Power Supply, comprises above-described dynamic magnetic balance regulating circuit.
Compared with prior art, the present invention has the following advantages:
The midrange of voltage after the mid-point voltage of the upper and lower bridge arm of the dynamic magnetic balance regulating circuit collection half-bridge inversion circuit that present embodiment provides and the rectification, these two voltages are compared the back as control signal, the duty of ratio of switching tube on the controlling and driving upper and lower bridge arm, thus the imbalance of brachium pontis mid-point voltage effectively controlled.Because sampling unit can be gathered voltage signal in real time, therefore, control unit can carry out unbalanced adjustment according to the result who samples in time.
Description of drawings
Fig. 1 is the adjustment circuit that solves magnetic bias in the prior art;
Fig. 2 is dynamic magnetic balance regulating circuit embodiment one schematic diagram provided by the invention;
Fig. 3 is the circuit diagram of dynamic magnetic balance regulating circuit embodiment one correspondence provided by the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Referring to Fig. 2, this figure is dynamic magnetic balance regulating circuit embodiment one schematic diagram provided by the invention.
The dynamic magnetic balance regulating circuit that present embodiment provides is applied to comprise in the half-bridge inversion circuit: first sampling unit 201, second sampling unit 202, comparing unit 203 and control unit 204.
Described first sampling unit 201 is used to gather the mid-point voltage of the upper and lower bridge arm of half-bridge inversion circuit, and this mid-point voltage is sent to described comparing unit 203.
Described second sampling unit 202 is used to gather the midrange of voltage after the rectification, and this midrange is sent to described comparing unit 203.
Comparing unit 203 is used for described mid-point voltage and midrange are compared, and comparative result is sent to described control unit 204.
Described control unit 204 when described comparative result is a described mid-point voltage during greater than described midrange, is used to reduce to drive the duty of ratio of brachium pontis switching tube, equals described midrange up to described mid-point voltage; When described comparative result is a described mid-point voltage during less than described midrange, be used to reduce to drive down the duty of ratio of brachium pontis switching tube, equal described midrange up to described mid-point voltage.
It is because the imbalance of the brachium pontis mid-point voltage of inverter circuit that bias phenomenon appears in transformer.When the brachium pontis neutral point voltage balance, the two ends of primary winding just can not produce direct current pressure reduction, DC bias current can not occur in the circuit yet.
The midrange of voltage after the mid-point voltage of the upper and lower bridge arm of the dynamic magnetic balance regulating circuit collection half-bridge inversion circuit that present embodiment provides and the rectification, these two voltages are compared the back as control signal, the duty of ratio of switching tube on the controlling and driving upper and lower bridge arm, thus the imbalance of brachium pontis mid-point voltage effectively controlled.Because sampling unit can be gathered voltage signal in real time, therefore, control unit can carry out unbalanced adjustment according to the result who samples in time.
Introduce below in conjunction with concrete circuit diagram.
Referring to Fig. 3, this figure is the circuit diagram of dynamic magnetic balance regulating circuit embodiment one correspondence provided by the invention.
Described comparing unit comprises the first voltage comparator N1ALM324, the second voltage comparator N1CLM324 and tertiary voltage comparator N1DLM324.
Described mid-point voltage is imported the negative input end of the described first voltage comparator N1ALM324, and described midrange is imported the positive input terminal of the described first voltage comparator N1ALM324.
The output of the described first voltage comparator N1ALM324 connects the negative input end of the described second voltage comparator N1CLM324; The positive input terminal of the described second voltage comparator N1CLM324 connects reference voltage VREF; The output of the described second voltage comparator N1CLM324 connects the first input end B of described control unit by resistance.
The output of the described second voltage comparator N1CLM324 connects the negative input end of described tertiary voltage comparator N1DLM324; The positive input terminal of described tertiary voltage comparator N1DLM324 connects described reference voltage VREF; The output of described tertiary voltage comparator N1DLM324 connects the second input A of described control unit by resistance.
Need to prove that the second voltage comparator N1CLM324 is identical with the reference voltage of tertiary voltage comparator N1DLM324.
The effect of first voltage comparator is to carry out add operation, the difference of two voltages of sampling is amplified, if the balance of voltage of upper and lower bridge arm, the output valve of first voltage comparator will can not make second voltage comparator and tertiary voltage comparator output high level or low level so.
The function of second voltage comparator and tertiary voltage comparator is the same, but when the Voltage unbalance of upper and lower bridge arm, the level that these two voltage comparators are exported is opposite.As can be seen from Figure 3, their effects are can speed-up capacitor C9 or C11 discharge when output low level.
Described control unit comprises main control chip N3UC3825 and shaping chip for driving IR2213.
The first input end HIN of the described shaping chip for driving of input after the signal stack of the first output OUTB of described main control chip N3UC3825 and the first input end B of described control unit.
The second input LIN of the described shaping chip for driving of input after the signal stack of the second output OUTA of described main control chip N3UC3825 and the second input A of described control unit.
The first output end signal DrvB of described shaping chip for driving IR2213 is as driving the pulse of going up the brachium pontis switching tube.
The second output end signal DrvA of described shaping chip for driving IR2213 is as driving the pulse of brachium pontis switching tube down.
Described first sampling unit comprises the first brachium pontis capacitor C 1 and the second brachium pontis capacitor C 2 that the appearance value is identical, described first brachium pontis capacitor C 1 and the second brachium pontis capacitor C, 2 series connection backs and described upper and lower bridge arm (not shown) in parallel.
Described mid-point voltage is the voltage of the common port of the described first brachium pontis capacitor C 1 and the second brachium pontis capacitor C 2.
Described second sampling unit comprises first resistance R 1 and second resistance R 2 that resistance is identical, and described first resistance R 1 and second resistance, 2 series connection backs are in parallel with described upper and lower bridge arm.
Need to prove that second sampling unit can be selected the number of resistance as required, as long as guarantee that the voltage of sampling is the midrange of the voltage after the rectification.For example, can select four resistance, two of two of tops and bottoms.
Described midrange is the voltage of the common port of described first resistance R 1 and second resistance R 2.
There will be two kinds of situations when Voltage unbalance appears in upper and lower bridge arm, and a kind of is the mid-point voltage of the brachium pontis midrange after greater than rectification; Another kind is the mid-point voltage of the brachium pontis midrange after less than rectification.
Introduce above two kinds of situations respectively below in conjunction with circuit.
First kind of situation, during midrange after the mid-point voltage of brachium pontis is greater than rectification, be HVDCSIG3＞HVDCM, the 1 pin output high level of the first voltage comparator N1ALM324, the 8 pin output low levels of the second voltage comparator N1CLM324, the 14 pin output high level of tertiary voltage comparator N1DLM324.
During the 8 pin output low levels of the second voltage comparator N1CLM324, can make the width drawing down of driving pulse OUTB, OUTB is used for driving the switching tube of brachium pontis, the duty of ratio that drives the switching tube of going up brachium pontis like this will reduce, the charging interval of the second brachium pontis capacitor C 2 reduces, and the voltage on the first brachium pontis capacitor C 1 will descend.Through after several switch periods, make the magnitude of voltage of HVDCSIG3 descend, up to adjusting to big or small the same with HVDCM.
Second kind of situation, during midrange after the mid-point voltage of brachium pontis is less than rectification, be HVDCSIG3＜HVDCM, the 1 pin output low level of the first voltage comparator N1ALM324, the 8 pin output high level of the second voltage comparator N1CLM324, the 14 pin output low levels of tertiary voltage comparator N1DLM324.
During the 14 pin output low levels of tertiary voltage comparator N1DLM324, can make the width drawing down of driving pulse OUTA, OUTA is used for driving down the switching tube of brachium pontis, driving down like this, the duty of ratio of the switching tube of brachium pontis will reduce, the charging interval of the first brachium pontis capacitor C 1 reduces, and the voltage on the second brachium pontis capacitor C 2 will rise.Through after several switch periods, make the magnitude of voltage of HVDCSIG3 can be raised to big or small the same with HVDCM.
Need to prove that the dynamic magnetic balance regulating circuit that above embodiment provides is at half-bridge inversion circuit, the embodiment of the invention also provides a kind of dynamic magnetic balance regulating circuit at full bridge inverter.
The voltage of first sampling unit sampling that different with the dynamic magnetic balance regulating circuit of half-bridge inversion circuit is is different.Because full bridge inverter has four brachium pontis up and down, and a switching tube is arranged on each brachium pontis, is called upper left switching tube, lower-left switching tube, upper right switching tube and bottom right switching tube.Therefore, driving pulse is to drive two switching tubes that intersect up and down.
Below the dynamic magnetic balance regulating circuit that is applied in the full bridge inverter is described in detail, comprising: first sampling unit, second sampling unit, comparing unit and control unit.
Described first sampling unit is used for gathering the capacitance voltage at full bridge inverter capacitance two ends, and this capacitance voltage is sent to described comparing unit.
Described second sampling unit is used to gather the midrange of voltage after the rectification, and this midrange is sent to described comparing unit.
Comparing unit is used for described capacitance voltage and midrange are compared, and comparative result is sent to described control unit.
Described control unit when described comparative result is a described capacitance voltage during greater than described midrange, is used to reduce to drive the duty of ratio of upper right switching tube and lower-left switching tube, equals described midrange up to described capacitance voltage; When described comparative result is a described capacitance voltage during less than described midrange, be used to reduce to drive the duty of ratio of upper left switching tube and bottom right switching tube, equal described midrange up to described capacitance voltage.
Need to prove, be applied in the full bridge inverter dynamic magnetic balance regulating circuit be applied to switching tube in the half-bridge inversion circuit except the voltage location of first sampling unit sampling and final pulsed drive different, other are all identical, concrete circuit can not repeat them here referring to the description to Fig. 3.
Full bridge inverter and half-bridge inversion circuit are had any different and are also had, and first output end signal of described shaping chip for driving is as the pulse that drives upper right switching tube and lower-left switching tube; Second output end signal of described shaping chip for driving is as the pulse that drives upper left switching tube and bottom right switching tube.
The present invention also provides a kind of Switching Power Supply, comprises the described dynamic magnetic balance regulating circuit of above embodiment, can be that full bridge inverter or half-bridge inversion circuit are selected the corresponding dynamic magnetic balance regulating circuit according to inverter circuit specifically.
Need to prove that the Switching Power Supply that the embodiment of the invention provides does not specifically limit the concrete form that rectification circuit adopts, and for example can be full-wave rectification, halfwave rectifier etc.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. dynamic magnetic balance regulating circuit in the Switching Power Supply is applied to it is characterized in that in the half-bridge inversion circuit, comprising: first sampling unit, second sampling unit, comparing unit and control unit;
Described first sampling unit is used to gather the mid-point voltage of the upper and lower bridge arm of half-bridge inversion circuit, and this mid-point voltage is sent to described comparing unit;
Described second sampling unit is used to gather the midrange of voltage after the rectification, and this midrange is sent to described comparing unit;
Comparing unit is used for described mid-point voltage and midrange are compared, and comparative result is sent to described control unit;
Described control unit when described comparative result is a described mid-point voltage during greater than described midrange, is used to reduce to drive the duty of ratio of brachium pontis switching tube, equals described midrange up to described mid-point voltage; When described comparative result is a described mid-point voltage during less than described midrange, be used to reduce to drive down the duty of ratio of brachium pontis switching tube, equal described midrange up to described mid-point voltage.
2. dynamic magnetic balance regulating circuit in the Switching Power Supply according to claim 1 is characterized in that, described comparing unit comprises first voltage comparator, second voltage comparator and tertiary voltage comparator;
Described mid-point voltage is imported the negative input end of described first voltage comparator, and described midrange is imported the positive input terminal of described first voltage comparator;
The output of described first voltage comparator connects the negative input end of described second voltage comparator; The positive input terminal of described second voltage comparator connects reference voltage; The output of described second voltage comparator connects the first input end of described control unit by resistance;
The output of described second voltage comparator connects the negative input end of described tertiary voltage comparator; The positive input terminal of described tertiary voltage comparator connects described reference voltage; The output of described tertiary voltage comparator connects second input of described control unit by resistance.
3. dynamic magnetic balance regulating circuit in the Switching Power Supply according to claim 2 is characterized in that, described control unit comprises main control chip and shaping chip for driving;
The first input end of the described shaping chip for driving of input after first output of described main control chip and the stack of the first input end signal of described control unit;
Second input of the described shaping chip for driving of input after second output of described main control chip and the stack of second input end signal of described control unit;
First output end signal of described shaping chip for driving is as driving the pulse of going up the brachium pontis switching tube;
Second output end signal of described shaping chip for driving is as driving the pulse of brachium pontis switching tube down.
4. according to dynamic magnetic balance regulating circuit in each described Switching Power Supply of claim 1 to 3, it is characterized in that, described first sampling unit comprises the first brachium pontis electric capacity and the second brachium pontis electric capacity that the appearance value is identical, and is in parallel with the upper and lower bridge arm of described half-bridge inversion circuit after the described first brachium pontis electric capacity and the second brachium pontis capacitances in series;
Described mid-point voltage is the voltage of the common port of the described first brachium pontis electric capacity and the second brachium pontis electric capacity.
5. according to dynamic magnetic balance regulating circuit in each described Switching Power Supply of claim 1 to 3, it is characterized in that, described second sampling unit comprises first resistance and second resistance that resistance is identical, and described first resistance and second resistance series connection back are in parallel with the upper and lower bridge arm of described half-bridge inversion circuit;
Described midrange is the voltage of the common port of described first resistance and second resistance.
6. dynamic magnetic balance regulating circuit in the Switching Power Supply is applied to it is characterized in that in the full bridge inverter, comprising: first sampling unit, second sampling unit, comparing unit and control unit;
Described first sampling unit is used for gathering the capacitance voltage at full bridge inverter capacitance two ends, and this capacitance voltage is sent to described comparing unit;
Described second sampling unit is used to gather the midrange of voltage after the rectification, and this midrange is sent to described comparing unit;
Comparing unit is used for described capacitance voltage and midrange are compared, and comparative result is sent to described control unit;
Described control unit when described comparative result is a described capacitance voltage during greater than described midrange, is used to reduce to drive the duty of ratio of upper right switching tube and lower-left switching tube, equals described midrange up to described capacitance voltage; When described comparative result is a described capacitance voltage during less than described midrange, be used to reduce to drive the duty of ratio of upper left switching tube and bottom right switching tube, equal described midrange up to described capacitance voltage.
7. dynamic magnetic balance regulating circuit in the Switching Power Supply according to claim 6 is characterized in that, described comparing unit comprises first voltage comparator, second voltage comparator and tertiary voltage comparator;
Described capacitance voltage is imported the negative input end of described first voltage comparator, and described midrange is imported the positive input terminal of described first voltage comparator;
The output of described first voltage comparator connects the negative input end of described second voltage comparator; The positive input terminal of described second voltage comparator connects reference voltage; The output of described second voltage comparator connects the first input end of described control unit by resistance;
The output of described second voltage comparator connects the negative input end of described tertiary voltage comparator; The positive input terminal of described tertiary voltage comparator connects described reference voltage; The output of described tertiary voltage comparator connects second input of described control unit by resistance.
8. dynamic magnetic balance regulating circuit in the Switching Power Supply according to claim 7 is characterized in that, described control unit comprises main control chip and shaping chip for driving;
The first input end of the described shaping chip for driving of input after first output of described main control chip and the stack of the first input end signal of described control unit;
Second input of the described shaping chip for driving of input after second output of described main control chip and the stack of second input end signal of described control unit;
First output end signal of described shaping chip for driving is as the pulse that drives upper right switching tube and lower-left switching tube;
Second output end signal of described shaping chip for driving is as the pulse that drives upper left switching tube and bottom right switching tube.
9. according to dynamic magnetic balance regulating circuit in each described Switching Power Supply of claim 6 to 8, it is characterized in that, described second sampling unit comprises first resistance and second resistance that resistance is identical, and described first resistance and second resistance series connection back are in parallel with described upper and lower bridge arm;
Described midrange is the voltage of the common port of described first resistance and second resistance.
10. a Switching Power Supply is characterized in that, comprises each described dynamic magnetic balance regulating circuit as claim 1-9.
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| CN102500874A (en) * | 2011-11-10 | 2012-06-20 | 山东大学 | Intelligent magnetic biasing detection and processing device for inversion welding power supply |
| WO2015192650A1 (en) * | 2014-06-20 | 2015-12-23 | 华为技术有限公司 | Power source management method and power source |
| CN105322797A (en) * | 2014-07-22 | 2016-02-10 | 北京嘉昌机电设备制造有限公司 | Improved half-bridge topology circuit |
| CN105652062A (en) * | 2014-11-21 | 2016-06-08 | 中国航空工业集团公司雷华电子技术研究所 | Current detection circuit of full bridge converter power loop |
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| CN102500874B (en) * | 2011-11-10 | 2014-07-02 | 山东大学 | Intelligent magnetic biasing detection and processing device for inversion welding power supply |
| WO2015192650A1 (en) * | 2014-06-20 | 2015-12-23 | 华为技术有限公司 | Power source management method and power source |
| US9787203B2 (en) | 2014-06-20 | 2017-10-10 | Huawei Technologies Co., Ltd. | Power source management method and power source |
| CN105322797A (en) * | 2014-07-22 | 2016-02-10 | 北京嘉昌机电设备制造有限公司 | Improved half-bridge topology circuit |
| CN105652062A (en) * | 2014-11-21 | 2016-06-08 | 中国航空工业集团公司雷华电子技术研究所 | Current detection circuit of full bridge converter power loop |
| CN108986417A (en) * | 2018-05-31 | 2018-12-11 | 新乡市华西卫材有限公司 | The warning device of material curtain coating compounding machine is defended in medical treatment |
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