CN103916009A - Negative voltage output circuit - Google Patents
Negative voltage output circuit Download PDFInfo
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- CN103916009A CN103916009A CN201410100048.XA CN201410100048A CN103916009A CN 103916009 A CN103916009 A CN 103916009A CN 201410100048 A CN201410100048 A CN 201410100048A CN 103916009 A CN103916009 A CN 103916009A
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Abstract
The invention discloses a negative voltage output circuit. The negative voltage output circuit comprises an inductor, a power switch tube, a first capacitor, a first switching circuit, a second switching circuit and a first output capacitor. The first end of the inductor is connected with the positive pole of a voltage input end. The second end of the inductor is connected with the first polar end of the power switch tube. The second polar end of the power switch tube is connected with the negative pole of the voltage input end and the negative pole of a voltage output end jointly. The first end of the first capacitor is connected with the second end of the inductor. The second end of the first capacitor is connected with the first end of the first switching circuit. The second end of the first switching circuit is connected with the first end of the first output capacitor. The second end of the first output capacitor is connected with the negative pole of the voltage output end. The first end of the second switching circuit is connected with the second end of the first capacitor. The second end of the second switching circuit is connected with the negative pole of the voltage output end. At any moment, the switch-on or switch-off state of the first switching circuit is the same as that of the power switch tube, and the switch-on or switch-off state of the second switching circuit is opposite to that of the power switch tube.
Description
Technical field
The present invention relates to electronic applications, relate in particular to a kind of negative voltage output circuit.
Background technology
In Switching Power Supply, prior art adopts Buck-Boost converter to realize negative voltage output conventionally.Fig. 1 has provided a kind of Buck-Boost circuit of exporting negative voltage, and as shown in Figure 1, Buck-Boost circuit comprises Buck-Boost converter and drive circuit, its power switch pipe Q conducting or shutoff under the control of drive circuit.
As seen from Figure 1, the source electrode " S " of power switch pipe Q in this circuit is connected with inductance L, so the electromotive force of its source electrode " S " is higher, the driving signal that only inputs to grid " G " has higher voltage, just can produce higher gate source voltage Vgs, thus driving power switching tube Q work.Like this, in the time of application, can not directly input pulse-width modulation (Pulse Width Modulation to the grid " G " of power switch pipe Q, being called for short PWM) signal carrys out driving power switching tube Q work, and amplifying circuit need to be set, pwm signal is amplified, pwm signal after amplifying is inputed to the grid " G " of power switch pipe Q, could driving power switching tube Q work.Therefore application prior art exists: for driving the more complicated defect of drive circuit of this power switch pipe Q.
In addition, shown in application drawing 1 also there is following defect in circuit: in the time that power switch pipe Q turn-offs, the voltage stress that power switch pipe Q bears at two ends is higher.For example, establishing current input voltage vin is 4V, and output voltage V o is-10V that the voltage stress that shown in Fig. 1, bear at the power switch pipe Q two ends in circuit is (Vin-Vo)=4+10=14, up to 14V.
To sum up, adopt the prior art shown in Fig. 1 to have drive circuit complexity, the high defect of voltage stress of power switch pipe, is unfavorable for implementing.
Summary of the invention
Embodiment of the present invention object is: a kind of negative voltage output circuit is provided, applies the voltage stress that this technical scheme is conducive to reduce power switch pipe.
First aspect, a kind of negative voltage output circuit that the embodiment of the present invention provides, comprises inductance, power switch pipe, the first electric capacity, the first switching circuit, second switch circuit and the first output capacitance;
The first end of described inductance is connected with the positive pole of voltage input end, and the second end is connected with the first polar end of described power switch pipe, and the second polar end of described power switch pipe is connected jointly with the negative pole of described voltage input end and the negative pole of voltage output end;
The first end of described the first electric capacity is connected with the second end of described inductance, the second end is connected with the first end of described the first switching circuit, the second end of described the first switching circuit is connected with the first end of described the first output capacitance, and the second end of described the first output capacitance is connected with the negative pole of described voltage output end;
The first end of described second switch circuit is connected with the second end of described the first electric capacity, and the second end is connected with the negative pole of described voltage output end;
At any time, the on off operating mode of described the first switching circuit is consistent with the on off operating mode of described power switch pipe, and the on off operating mode of described second switch circuit is contrary with the on off operating mode of described power switch pipe.
In conjunction with first aspect, under the first implementation, also comprise: the second electric capacity, the 3rd switching circuit, the 4th switching circuit and the second output capacitance;
The first end of described the second electric capacity is connected with described second end of described inductance, the second end is connected with the first end of described the 3rd switching circuit, the second end of described the 3rd switching circuit is connected with the first end of described the second output capacitance, and the second end of described the second output capacitance is connected with the negative pole of described voltage output end;
The first end of described the 4th switching circuit is connected with described second end of described the second electric capacity, and the second end is connected with the described first end of described the first output capacitance;
At any time, described the 3rd on off operating mode of switching circuit and the on off operating mode of described power switch pipe are consistent, and described the 4th on off operating mode of switching circuit is contrary with the on off operating mode of described power switch pipe.
In conjunction with first aspect, under the first implementation, described the 3rd switching circuit comprises the 3rd diode,
The negative electrode of described the 3rd diode is connected with described second end of described the second electric capacity, and anode is connected with the described first end of described the second output capacitance.
In conjunction with first aspect, under the first implementation, described the 4th switching circuit comprises the 4th diode,
The anode of described the 4th diode is connected with described second end of described the second electric capacity, and negative electrode is connected with the described first end of described the first output capacitance.
In conjunction with first aspect, under the first implementation, described the first switching circuit comprises the first diode,
The negative electrode of described the first diode is connected with described second end of described the first electric capacity, and anode is connected with the described first end of described the first output capacitance.
In conjunction with first aspect, under the first implementation, described second switch circuit comprises the second diode,
The anode of described the second diode is connected with described second end of described the first electric capacity, and negative electrode is connected with the negative pole of described voltage output end.
In conjunction with first aspect, under the first implementation, the equal ground connection of described the second polar end of the negative pole of described voltage input end, the negative pole of described voltage output end and described power switch pipe.
In conjunction with first aspect, under the first implementation, between the positive and negative electrode of described voltage input end, be also parallel with an input capacitance.
Therefore application the present embodiment technical scheme, can realize the output of negative voltage.In addition, in the present embodiment, in the time that power switch pipe Q turn-offs, the voltage of power switch pipe Q bipolarity end equals the voltage at Cf1 two ends :-Vo, and the voltage stress of power switch pipe is Vo.Voltage stress with respect to power switch pipe in prior art is: | the technical scheme of Vo|+|Vin|, adopt the present embodiment technical scheme, the voltage stress that power switch pipe Q bears is lower, therefore adopt the present embodiment technical scheme lower to the requirement of power switch pipe Q.
Accompanying drawing explanation
The Buck-Boost circuit diagram of a kind of exportable negative voltage that Fig. 1 provides for prior art;
The structural representation of a kind of negative voltage output circuit that Fig. 2 provides for the embodiment of the present invention 1;
Fig. 3 is the drive circuit syndeton schematic diagram of circuit shown in Fig. 2;
Fig. 4 is the circuit loop schematic diagram forming in the time of power switch pipe Q conducting in Fig. 3 circuit;
Fig. 5 is the circuit loop schematic diagram forming in the time that the power switch pipe Q in Fig. 3 circuit turn-offs;
The structural representation of the first negative voltage output circuit that Fig. 6 provides for the embodiment of the present invention 2;
Fig. 7 is the circuit loop schematic diagram forming in the time of power switch pipe Q conducting in Fig. 6 circuit;
Fig. 8 is the circuit loop schematic diagram forming in the time that the power switch pipe Q in Fig. 6 circuit turn-offs;
The structural representation of the second negative voltage output circuit that Fig. 9 provides for the embodiment of the present invention 2;
The structural representation of a kind of negative voltage output circuit that Figure 10 provides for the invention process 3;
The structural representation of a kind of negative voltage output circuit that Figure 11 provides for the invention process 4.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
Embodiment 1:
The circuit theory schematic diagram of a kind of negative voltage output circuit that Fig. 2 provides for the present embodiment, Fig. 3 is the drive circuit syndeton schematic diagram of Fig. 2 circuit.
Shown in Fig. 2,3, the negative voltage output circuit of the present embodiment mainly comprises: inductance L, power switch pipe Q, the first capacitor C f1, the first diode Df11 and the second diode Df1.The annexation of each parts is as follows:
At voltage input end Vi input voltage input signal Vin, the positive pole "+" of voltage input end Vi and the first end of inductance L be connected, the second end of inductance L and the first polar end of power switch pipe Q (in figure take the drain electrode " D " of NPN pipe as example) are connected, and the second polar end of power switch pipe Q (in figure take the source electrode " S " of NPN pipe as example) is connected with the negative pole "-" of voltage input end Vi.
The drain electrode " D " of power switch pipe Q is also connected jointly with the first end of the first capacitor C f1, the second end of the first capacitor C f1 is connected with the negative electrode of the first diode Df11, the anode of the first diode Df11 is connected with the first end of the first output capacitance Co1, the second end of the first output capacitance Co1 is connected with the negative pole "-" of voltage output end Vo1, the negative electrode of the first diode Df11 also with the anodic bonding of the second diode Df1, the negative electrode of the second diode Df1 is connected with the negative pole "-" of voltage output end Vo1.
At the conducting control end of power switch pipe Q (in figure take the grid " G " of NPN pipe as example) input pwm signal, power switch pipe Q is conducting or shutoff under the driving of pwm signal.Shown in Figure 2, mainly comprise the first sampling resistor R1, the second sampling resistor R2, trsanscondutance amplifier Gm, building-out capacitor Cc, comparator A and trigger (take rest-set flip-flop as example) for the drive circuit of driving power switching tube Q.Its operation principle is as follows:
The first sampling resistor R1, the second sampling resistor R2 sample to the output voltage V o of the negative voltage output circuit shown in Fig. 2, and the connected node place between the first sampling resistor R1, the second sampling resistor R2 obtains feedback voltage Vfb.In the present embodiment, because one end of the second sampling resistor R2 connects the first sampling resistor R1, the other end connects direct current supply voltage vcc, therefore can obtain positive feedback voltage Vfb in the connected node place between the first sampling resistor R1, the second sampling resistor R2.Trsanscondutance amplifier Gm receives the reference voltage V ref of feedback voltage Vfb and outside input, trsanscondutance amplifier Gm compares both and the two voltage difference is changed, at the output output current of trsanscondutance amplifier Gm, this electric current charges to the building-out capacitor Cc of ground connection, is compensated voltage Vc.Comparator A receives bucking voltage Vc and for characterizing the sampled voltage VL_pk of inductive current peak, exports comparison signal at the output of comparator A.Reset terminal " R " termination of trigger RS is received this comparison signal, and set end " S " end receive clock signal CLK, at output " Q " the end output pwm signal of trigger RS, with the conducting of power ratio control switching tube Q.
Under pwm signal control, shown in Fig. 2,3, the operation principle of negative voltage output circuit is as follows:
Under the control of pwm signal, power switch pipe Q conducting or shutoff, specifically:
Shown in Figure 4, in the time that pwm signal is high level, power switch pipe Q conducting.
Near voltage input end Vi side, form the first loop H11 that comprises inductance L, power switch pipe Q and voltage input end Vi.
In the first loop H11, voltage input signal Vin is flowed into by the positive pole "+" of voltage input end Vi, flows into inductance L, and to inductance L charging, charging current I11 flows into the negative pole "-" of voltage input end Vi through inductance L, power switch pipe Q.The voltage at inductance L two ends equals input voltage vin;
In close voltage output end Vo1 side, owing to storing energy on the first capacitor C f1, the electromotive force of one end that the first capacitor C f1 is connected with power switch pipe Q is zero, therefore the first capacitor C f1 is negative value with the electromotive force of one end that the first diode Df11 negative electrode is connected, the electromotive force of the first diode Df11 negative electrode is negative value, now the first diode Df11 conducting, forms the second servo loop H12 that comprises the first capacitor C f1, power switch pipe Q, voltage output end Vo1 and the first diode Df11.
In second servo loop H12, the first capacitor C f1 electric discharge, forms discharging current I12.Specifically, discharging current I12 flows through the power switch pipe Q of conducting, the negative pole "-" through voltage output end Vo1, the positive pole "+" of voltage output end Vo1 by one end of the first capacitor C f1, flow through the first diode Df11 of conducting, flow back into the other end of the first capacitor C f1.Voltage analysis to second servo loop H12 is known, and the voltage at the first capacitor C f1 two ends is-Vo1.
Shown in Figure 5, in the time that pwm signal is low level, power switch pipe Q turn-offs.
In close voltage input end Vi side, voltage input signal Vin flows into the first capacitor C f1 by inductance L, to the first capacitor C f1 charging, inductance L is in discharge condition, energy on the first capacitor C f1 continues to increase, make the electromotive force of one end of the anodic bonding of the first capacitor C f1 and the second diode Df1 become positive potential, the second diode Df1 conducting, the first diode Df11 turn-offs.Now form the tertiary circuit H03 that comprises inductance L, the first capacitor C f1, the second diode Df1 and voltage input end Vo1.
In tertiary circuit H03, voltage input signal Vin charges to the first capacitor C f1 by tertiary circuit H03, the flow direction of charging current I03 is specially: the positive pole "+" by voltage input end Vi flows into, the inductance L of flowing through, to the first capacitor C f1 charging, flow through after the first capacitor C f1 the second diode Df1 of conducting, flows into the negative pole "-" of voltage input end Vi.
In close voltage output end Vo1 side, the first diode Df11 turn-offs, and provides output voltage V o by the output capacitance Co1 that is connected in parallel on voltage output end Vo1.
In circuit shown in Fig. 2-5, become the low level moment at pwm signal from high level, inductance starts discharging time, and the voltage at the first capacitor C f1 two ends is-Vo that the voltage VL at inductance L two ends equals Vi+Vo.
To foregoing circuit application weber balance principle: in the Switching Power Supply of steady operation, positive weber value at inductance L two ends equals negative weber value, has following expression formula (1) establishment:
Vin
*D=-(Vin+Vo)
*(1-D)，（1）
Wherein, the duty ratio that D is pwm signal.
Can obtain according to expression formula (1):
, due to 0<D<1, the output voltage V o at known voltage output end Vo1 two ends is constant is negative value.The visible output that utilizes the present embodiment technical scheme can realize negative voltage.
In addition, in the present embodiment, in the time that power switch pipe Q turn-offs, the voltage of power switch pipe Q bipolarity end equals the voltage at Cf1 two ends :-Vo, the voltage stress of power switch pipe equals Vo.Voltage stress with respect to power switch pipe in prior art equals | the technical scheme of Vo|+|Vin|, adopt the present embodiment technical scheme, and the voltage stress that power switch pipe Q bears is lower, therefore adopt the present embodiment technical scheme lower to the requirement of power switch pipe Q.
As the signal of the present embodiment, can make all ground connection of negative pole "-", the negative pole "-" of voltage output end Vo1 and the second polar end of power switch pipe Q (in figure take the source electrode " S " of NPN pipe " as example) of voltage input end Vi.Make the gate source voltage Vgs in this power switch pipe Q equal the grid voltage Vg in power switch pipe Q, thus directly at grid " G " the input pwm signal of power switch pipe Q, can be used for driving this power switch pipe, and without pwm signal is amplified.With respect to the technical scheme that could be used for driving this power switch pipe after must amplifying pwm signal shown in Fig. 1, the present embodiment technical scheme when application required drive circuit simpler, be easier to realize.
As the signal of the present embodiment, an input capacitance Cin can also be connected between the positive pole "+" of the voltage input end Vi of the present embodiment and negative pole "-", so that voltage input signal Vin is carried out to filtering, further to improve the job stability of the present embodiment circuit.
Embodiment 2:
The electrical block diagram of a kind of negative voltage output circuit that Fig. 6 provides for the present embodiment.The present embodiment circuit is on the circuit base of embodiment 1, to expand a kind of preferred embodiment structure obtaining.
Shown in Figure 6, the present embodiment negative voltage output circuit, except comprising the circuit shown in Fig. 2, also further comprises: the second capacitor C f2, the 3rd diode Df22, the 4th diode Df2 and the second output capacitance Co2.
Inductance L is also connected with one end of the second capacitor C f2 with the common connected node of power switch pipe Q the first polar end, the other end of the second capacitor C f2 is connected jointly with the negative electrode of the 3rd diode Df22 and the anode of the 4th diode Df2, the anode of the 3rd diode Df22 is connected with the first end of the second output capacitance Co2, the second end of the second output capacitance Co2 is connected with the negative pole "-" of voltage output end Vo2, the second output capacitance Co2 is connected in parallel on voltage output end Vo2 above, the anodic bonding of the negative electrode of the 4th diode Df2 and the first diode Df11.
The operation principle of the output circuit of negative voltage shown in Fig. 6 is as follows:
When pwm signal is high level, when power switch pipe Q conducting, shown in Figure 7, in circuit except being formed with: the first loop H11, second servo loop H12, be also formed with the 4th loop H14.Wherein, the first loop H14 comprises voltage input end Vi, inductance L and power switch pipe Q.Second servo loop H12 comprises the first output capacitance Co1, the first diode Df11, the first output capacitance Co1 and power switch pipe Q.The 4th loop H14 comprises: voltage output end Vo2, the 3rd diode Df22, the second capacitor C f2 and power switch pipe Q.Wherein the operation principle of the first loop H11, second servo loop H12 is shown in the analysis in embodiment 1 in detail, and the circuit structure of the 4th loop H14 and operation principle in like manner, in second servo loop H12, do not repeat them here.
When pwm signal is low level, power switch pipe Q turn-off time, shown in Figure 8, in circuit except being formed with: tertiary circuit H03, be also formed with the 5th loop H05.Wherein tertiary circuit H03 comprises voltage input end Vi, inductance L, the first capacitor C f1 and the second diode Df1.The 5th loop H05 comprises voltage input end Vi, inductance L, the second capacitor C f2, the 4th diode Df2 and the first output capacitance Co1.Wherein, the operation principle of tertiary circuit H03 is shown in the analysis in embodiment 1 in detail, and the circuit structure of the 5th loop H05 and operation principle in like manner, in tertiary circuit H03, do not repeat them here.
Therefore, adopt the technical scheme of the present embodiment except possessing the beneficial effect in embodiment 1, also due in the present embodiment, in the time that power switch pipe Q turn-offs, except the first capacitor C f1 being charged by tertiary circuit H03, also the second capacitor C f2 charge by the 5th loop H05, it is with respect to the structure shown in Fig. 2, this circuit structure is many a set of and the 5th loop H05 that tertiary circuit H03 is symmetrical.Known through analysis similar to Example 1, with respect to embodiment 1, the circuit of Application Example 2 can further reduce the voltage stress that power switch pipe Q bears.Therefore utilize the present embodiment technical scheme to be conducive to further reduce the voltage stress that power switch pipe Q bears.
As the signal of the present embodiment, if when the voltage of the voltage output end Vo1 output of the voltage of the voltage output end Vo2 of the present embodiment output and embodiment 1 is Vo, when making the 5th loop H05 identical with the respective devices parameter in tertiary circuit H03, and while making this two loop full symmetric, the voltage at the first output capacitance Co1 two ends shown in the present embodiment Fig. 6-8 in circuit equals
, the voltage stress that in the present embodiment, power switch pipe Q bears equals
, the half of the voltage stress only bearing for the power switch pipe Q in embodiment 1.
In addition, be basis by the structure of the present embodiment and operation principle, can also further expand circuit, its corresponding circuit structure can illustrate referring to Fig. 9, its principle, in like manner in Fig. 6-8 and above-mentioned principle analysis, does not repeat them here.
Embodiment 3:
Shown in Figure 10, in the present embodiment and embodiment 1, the difference shown in Fig. 2 is mainly:
The present embodiment adopts the first diode Df11 in the first K switch f11 alternative embodiment 1, the second diode Df1 in second switch Kf1 alternative embodiment 1.In the time of power switch pipe Q conducting, the first K switch f11 conducting, second switch Kf1 turn-offs; In the time that power switch pipe Q turn-offs, the first K switch f11 turn-offs, second switch Kf1 conducting.
As the signal of the present embodiment, can adopt the conducting control signal of pwm signal as the first K switch f11, use the negate signal of pwm signal as the conducting control signal of second switch Kf1, make the on off operating mode of the first K switch f11 identical with the on off operating mode of power switch pipe Q, the on off operating mode of second switch Kf1 is contrary with the on off operating mode of power switch pipe Q.
The operation principle of the present embodiment circuit and beneficial effect are in detail referring to the corresponding description in embodiment 1.
Embodiment 4:
Shown in Figure 11, in the present embodiment and embodiment 2, the difference shown in Fig. 6 is mainly:
The present embodiment adopts the first diode Df11 in the first K switch f11 alternative embodiment 2, the second diode Df1 in second switch Kf1 alternative embodiment 1, the 3rd diode Df22 in the 3rd K switch f22 alternative embodiment 2, the 4th diode Df2 in the 4th K switch f2 alternative embodiment 2.In the time of power switch pipe Q conducting, the first K switch f11 and the 3rd K switch f22 conducting, second switch Kf1 and the 4th K switch f2 turn-off; In the time that power switch pipe Q turn-offs, the first K switch f11 and the 3rd K switch f22 turn-off, second switch Kf1 and the 4th K switch f2 conducting.
As the signal of the present embodiment, can adopt the conducting control signal of pwm signal as the first K switch f11 and the 3rd K switch f22, use the negate signal of pwm signal as the conducting control signal of second switch Kf1 and the 4th K switch f2, make the on off operating mode of the first K switch f11 and the 3rd K switch f22 identical with the on off operating mode of power switch pipe Q, the on off operating mode of second switch Kf1 and the 4th K switch f2 is contrary with the on off operating mode of power switch pipe Q.
The operation principle of the present embodiment circuit and beneficial effect are in detail referring to the corresponding description in embodiment 2.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The modification done within any spirit at above-mentioned execution mode and principle, be equal to and replace and improvement etc., within all should being included in the protection range of this technical scheme.
Claims (8)
1. a negative voltage output circuit, is characterized in that, comprises inductance, power switch pipe, the first electric capacity, the first switching circuit, second switch circuit and the first output capacitance;
The first end of described inductance is connected with the positive pole of voltage input end, and the second end is connected with the first polar end of described power switch pipe, and the second polar end of described power switch pipe is connected jointly with the negative pole of described voltage input end and the negative pole of voltage output end;
The first end of described the first electric capacity is connected with the second end of described inductance, the second end is connected with the first end of described the first switching circuit, the second end of described the first switching circuit is connected with the first end of described the first output capacitance, and the second end of described the first output capacitance is connected with the negative pole of described voltage output end;
The first end of described second switch circuit is connected with the second end of described the first electric capacity, and the second end is connected with the negative pole of described voltage output end;
At any time, the on off operating mode of described the first switching circuit is consistent with the on off operating mode of described power switch pipe, and the on off operating mode of described second switch circuit is contrary with the on off operating mode of described power switch pipe.
2. negative voltage output circuit according to claim 1, is characterized in that,
Also comprise: the second electric capacity, the 3rd switching circuit, the 4th switching circuit and the second output capacitance;
The first end of described the second electric capacity is connected with described second end of described inductance, the second end is connected with the first end of described the 3rd switching circuit, the second end of described the 3rd switching circuit is connected with the first end of described the second output capacitance, and the second end of described the second output capacitance is connected with the negative pole of described voltage output end;
The first end of described the 4th switching circuit is connected with described second end of described the second electric capacity, and the second end is connected with the described first end of described the first output capacitance;
At any time, described the 3rd on off operating mode of switching circuit and the on off operating mode of described power switch pipe are consistent, and described the 4th on off operating mode of switching circuit is contrary with the on off operating mode of described power switch pipe.
3. negative voltage output circuit according to claim 2, is characterized in that,
Described the 3rd switching circuit comprises the 3rd diode,
The negative electrode of described the 3rd diode is connected with described second end of described the second electric capacity, and anode is connected with the described first end of described the second output capacitance.
4. according to the negative voltage output circuit described in claim 2 or 3, it is characterized in that,
Described the 4th switching circuit comprises the 4th diode,
The anode of described the 4th diode is connected with described second end of described the second electric capacity, and negative electrode is connected with the described first end of described the first output capacitance.
5. according to the negative voltage output circuit described in claim 1 or 2 or 3, it is characterized in that,
Described the first switching circuit comprises the first diode,
The negative electrode of described the first diode is connected with described second end of described the first electric capacity, and anode is connected with the described first end of described the first output capacitance.
6. according to the negative voltage output circuit described in claim 1 or 2 or 3, it is characterized in that,
Described second switch circuit comprises the second diode,
The anode of described the second diode is connected with described second end of described the first electric capacity, and negative electrode is connected with the negative pole of described voltage output end.
7. according to the negative voltage output circuit described in claim 1 or 2 or 3, it is characterized in that,
The equal ground connection of described the second polar end of the negative pole of described voltage input end, the negative pole of described voltage output end and described power switch pipe.
8. negative voltage output circuit according to claim 1 and 2, is characterized in that,
Between the positive and negative electrode of described voltage input end, be also parallel with an input capacitance.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106712499A (en) * | 2016-12-13 | 2017-05-24 | 西安空间无线电技术研究所 | Novel low-electrical-stress single tube control buck-boost converter |
| CN110266281A (en) * | 2019-06-12 | 2019-09-20 | 成都华微电子科技有限公司 | Band gap trsanscondutance amplifier applied to BOOST current mode current operator |
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| CN102723866A (en) * | 2012-05-17 | 2012-10-10 | 浙江工业大学 | BJT-typed self-exciting Cuk converter provided with main switching transistor having small driving loss |
| CN102904445A (en) * | 2012-10-15 | 2013-01-30 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and control method applied to high-frequency direct current converter |
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| CN106712499A (en) * | 2016-12-13 | 2017-05-24 | 西安空间无线电技术研究所 | Novel low-electrical-stress single tube control buck-boost converter |
| CN110266281A (en) * | 2019-06-12 | 2019-09-20 | 成都华微电子科技有限公司 | Band gap trsanscondutance amplifier applied to BOOST current mode current operator |
| CN110266281B (en) * | 2019-06-12 | 2023-05-16 | 成都华微电子科技股份有限公司 | Band gap transconductance amplifier applied to BOOST current operation |
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