CN103560665A - DC-DC conversion circuit and DC-DC chip - Google Patents
DC-DC conversion circuit and DC-DC chip Download PDFInfo
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- CN103560665A CN103560665A CN201310554340.4A CN201310554340A CN103560665A CN 103560665 A CN103560665 A CN 103560665A CN 201310554340 A CN201310554340 A CN 201310554340A CN 103560665 A CN103560665 A CN 103560665A
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Abstract
The invention belongs to the field of direct current conversion, and provides a DC-DC conversion circuit and a DC-DC chip. The DC-DC conversion circuit and the DC-DC chip are characterized in that a current dividing module is controlled according to changes of the feedback voltage at the DC-DC output end to carry out current division on a charging current of a charging and discharging module, the charging current of the charging and discharging module is accordingly changed, then the charging time of a charging and discharging capacitor is changed, the oscillation period of an oscillation circuit is further changed, and the soft start aim is achieved. According to the DC-DC conversion circuit, the soft start period of the DC-DC conversion circuit can be adjusted, pins special for the chip are not required, the capacity of the charging and discharging capacitor is not required to be increased, the design is simple, the cost of the DC-DC conversion circuit is reduced, a surge current at the output end when the DC-DC conversion circuit is started can be suppressed, and voltage overshooting is avoided.
Description
Technical field
The invention belongs to direct current conversion field, relate in particular to a kind of DC-DC change-over circuit and DC-DC chip.
Background technology
DC-DC change-over circuit is when powering on, output has very large surge current, also likely there is voltage overshoot, these cause uncertain impact all can to the electronic system at DC-DC change-over circuit place, therefore need soft start to realize the smooth starting of DC-DC change-over circuit, carry out limit inrush currents, eliminate output voltage overshoot.
General soft starting circuit all needs chip dedicated pin to come external capacitor to reach the function of soft start, the complexity of circuit and the raising of application cost when this has just caused chip application.In the prior art, DC-DC change-over circuit (chip) inside is integrated with soft starting circuit, but due to the time of soft start and the charging interval of charging capacitor proportional, and charging current can not change, when will be longer soft-start time time, must increase the capacity of charging capacitor, design is complicated and increased the cost of whole circuit.
Summary of the invention
The invention provides a kind of DC-DC change-over circuit, be intended to solve the problem that in existing DC-DC change-over circuit, soft starting circuit design is complicated, cost is higher.
In order to solve the problems of the technologies described above, the present invention is achieved in that a kind of DC-DC change-over circuit, comprise the oscillating circuit of controlling described DC-DC change-over circuit soft-start period, described oscillating circuit comprises the charge-discharge modules being connected with charge power supply, described charge-discharge modules comprises the charge and discharge capacitance being connected with charge power supply, and described DC-DC change-over circuit also comprises:
The first power end is connected with pressure feedback port with the reference voltage output terminal of described DC-DC change-over circuit respectively with second source end, input is connected with the charging circuit of described charge-discharge modules, output head grounding, for shunting to regulate the diverter module of described cycle of oscillation at the electric current of charging process to described charge-discharge modules according to the variation of the feedback voltage of described DC-DC change-over circuit.
Further, described oscillating circuit also comprises the oscillator that generates oscillator signal.
Further, described charge-discharge modules comprises at least one charge and discharge capacitance.
Further, described diverter module comprises the first operational amplifier U1 and the first switching tube;
The inverting input of described the first operational amplifier U1 is the first power end of described diverter module, the normal phase input end of described the first operational amplifier U1 is the second source end of described diverter module, the output of described operational amplifier is connected with the control end of described the first switching tube, the hot end of described the first switching tube is the input of described diverter module, the output that the cold end of described the first switching tube is described diverter module.
Further, described the first switching tube is a NMOS pipe;
The grid of a described NMOS pipe is the control end of described the first switching tube, and the drain electrode of a described NMOS pipe is the hot end of described the first switching tube, and the source electrode of a described NMOS pipe is the cold end of described the first switching tube.
Further, described the first switching tube is a NPN type triode;
The base stage of a described NPN type triode is the control end of described the first switching tube, and the base stage of a described NPN type triode is the hot end of described the first switching tube, the cold end of very described first switching tube of transmitting of a described NPN type triode.
Further, described diverter module comprises:
The one PMOS field effect transistor, the 2nd PMOS field effect transistor, the 3rd PMOS field effect transistor, the 4th NMOS field effect transistor and second switch pipe;
The grid of a described PMOS field effect transistor is the first power end of described diverter module, the source electrode of a described PMOS field effect transistor is connected with the drain electrode of described the 2nd PMOS field effect transistor and the source electrode of described the 3rd PMOS field effect transistor, the grid of described the 2nd PMOS field effect transistor is connected with the bias current output of described DC-DC change-over circuit, the source electrode of described the 2nd PMOS field effect transistor is connected with the power end of described DC-DC change-over circuit, the grid of described the 3rd PMOS field effect transistor is the second source end of described diverter module, the drain electrode of described the 3rd PMOS field effect transistor is connected with the drain electrode of described the 4th NMOS field effect transistor and the grid of described the 4th NMOS field effect transistor, the source electrode of the drain electrode of a described PMOS field effect transistor and described the 4th NMOS field effect transistor is connected to the cold end of described second switch pipe altogether, the grid of described the 4th NMOS field effect transistor is connected with the control end of described second switch pipe, the hot end of described second switch pipe is the input of described diverter module, the cold end of described second switch pipe is the cold end of described second switch pipe.
Further, described second switch pipe is the 2nd NMOS pipe;
The grid of described the 2nd NMOS pipe is the control end of described second switch pipe, and the drain electrode of described the 2nd NMOS pipe is the hot end of described second switch pipe, and the source electrode of described the 2nd NMOS pipe is the cold end of described second switch pipe.
Further, described second switch pipe is the 2nd NPN type triode;
The base stage of described the 2nd NPN type triode is the control end of described second switch pipe, and the base stage of described the 2nd NPN type triode is the hot end of described second switch pipe, the cold end of the very described second switch pipe of transmitting of described the 2nd NPN type triode.
The present invention also provides a kind of DC-DC chip, and described DC-DC chip comprises as above arbitrary described DC-DC change-over circuit.
In the present invention, according to the variation of the feedback voltage of DC-DC output, controlling diverter module shunts the charging current of charge and discharge capacitance, thereby change the charging current of charge-discharge modules, and then the charging interval of change charge-discharge modules, further make change the cycle of oscillation of oscillating circuit, reach the object of soft start, DC-DC change-over circuit provided by the invention can regulate its soft-start period, and do not need chip dedicated pin and do not need to increase the capacity of charge and discharge capacitance, simplicity of design, reduced the cost of circuit, and the surge current of output can suppress circuit start time, eliminate voltage overshoot.
Accompanying drawing explanation
Fig. 1 is the modular structure figure of the DC-DC change-over circuit that provides of the embodiment of the present invention;
Fig. 2 is the modular structure figure of the diverter module that provides of first embodiment of the invention;
Fig. 3 is the circuit structure diagram of the diverter module that provides of first embodiment of the invention;
Fig. 4 is another circuit structure diagram of the diverter module that provides of first embodiment of the invention;
Fig. 5 is the modular structure figure of the diverter module that provides of second embodiment of the invention;
Fig. 6 is the circuit structure diagram of the diverter module that provides of second embodiment of the invention;
Fig. 7 is another circuit structure diagram of the diverter module that provides of second embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Below in conjunction with specific embodiment, specific implementation of the present invention is described in detail:
Fig. 1 shows the modular structure of the DC-DC change-over circuit that the embodiment of the present invention provides, and for convenience of explanation, only lists the part relevant to the embodiment of the present invention, and details are as follows:
As shown in Figure 1, the DC-DC change-over circuit that the embodiment of the present invention provides comprises the oscillating circuit 101 of controlling described DC-DC change-over circuit soft-start period, oscillating circuit 101 comprises the charge-discharge modules 1011 being connected with charge power supply VCC, and DC-DC change-over circuit also comprises:
The first power end and second source end respectively with the reference voltage output terminal V of DC-DC change-over circuit
rEFwith pressure feedback port V
fBconnect, input is connected with the charging circuit of charge-discharge modules 1011, and output head grounding, for according to the feedback voltage V of DC-DC change-over circuit
rEFvariation to charge-discharge modules 1011 electric current in charging process shunt to regulate the diverter module 102 of the cycle of oscillation of oscillator 1012.
In embodiments of the present invention, the input of diverter module 102 is connected with the charging circuit of charge-discharge modules 1011, its link position does not limit, as long as can shunt the charging current of charge-discharge modules 1011, diverter module 102 receives the feedback signal V of output in the start-up course of whole DC-DC change-over circuit
fB, diverter module 102 is according to feedback voltage V
fBvariation (from small to large) charging current of charge-discharge modules 1011 is shunted, thereby affect the charging interval of charge-discharge modules 1011, be directly proportional the cycle of oscillation producing due to oscillating circuit 101 to the charging interval of charge-discharge modules 1011, when charging current diminishes, charging interval is inevitable elongated, the cycle of oscillation of oscillating circuit 101 is elongated, thereby to regulating the cycle of oscillation of oscillating circuit 101, reaches the object of the soft start of DC-DC change-over circuit.
As one embodiment of the invention, oscillating circuit 101 also comprises the oscillator 1012 that generates oscillator signal.
As one embodiment of the invention, charge-discharge modules 1011 comprises at least one charge and discharge capacitance C.
In embodiments of the present invention, charge-discharge modules 1011 can comprise the charge and discharge capacitance of one or more series/parallels, according to the connected mode or the quantity that change charge and discharge capacitance, can change the charge/discharge capacity of charge-discharge modules 1011, and then change discharges and recharges the cycle of the generation signal of time and oscillating circuit, because the operation principle of a charge and discharge capacitance or a plurality of charge and discharge capacitances is basic identical, for convenience of explanation, in following examples all to adopt a charge and discharge capacitance to describe.
embodiment mono-:
Fig. 2 shows the modular structure of the diverter module 102 that first embodiment of the invention provides, and for convenience of explanation, only lists to the present invention first and implements relevant part, and details are as follows:
As shown in Figure 2, as one embodiment of the invention, diverter module 102 comprises the first operational amplifier U1 and the first switching tube 1021;
The inverting input of the first operational amplifier U1 is the first power end of diverter module 102, the normal phase input end of the first operational amplifier U1 is the second source end of diverter module 102, the output of the first operational amplifier U1 is connected with the control end of the first switching tube 1021, the hot end of the first switching tube 1021 is the input of diverter module 102, and the cold end of the first switching tube 1021 is the output of diverter module 102.
As shown in Figure 3, as one embodiment of the invention, the first switching tube is a NMOS pipe Q1;
The grid of the one NMOS pipe Q1 is the control end of the first switching tube 1021, and the drain electrode of a NMOS pipe Q1 is the hot end of the first switching tube 1021, and the source electrode of a NMOS pipe Q1 is the cold end of the first switching tube 1021.
As shown in Figure 4, as one embodiment of the invention, the first switching tube 1021 is a NPN type triode Q2;
The base stage of the one NPN type triode Q2 is the control end of the first switching tube 1021, and the base stage of a NPN type triode Q2 is the hot end of the first switching tube 1021, and the transmitting of a NPN type triode Q2 is the cold end of the first switching tube 1021 very.
The operation principle of the diverter module below first embodiment of the invention being provided be take the first switching tube 1021 and is described as a NMOS pipe Q1 as example:
After DC-DC change-over circuit powers on, now oscillator 1012 is started working, because the output voltage of DC-DC change-over circuit is slowly risen by low level, so feedback voltage V
fBby 0V, started to rise equally, work as feedback voltage V
fBbe less than reference voltage V
rEFtime, operational amplifier U1 output level is relatively high, now controls a NMOS pipe Q1 conducting, and the charging current I of charge and discharge capacitance C has part electric current I
2enter diverter module 102, the charging current of charge and discharge capacitance C diminished, the charging interval of charge and discharge capacitance C elongated, become cycle of oscillation of oscillator 1012 large; Along with the output voltage of DC-DC change-over circuit becomes greatly gradually, feedback voltage V now
fBalso becoming large, work as feedback voltage V
fBbe greater than reference voltage V
rEFtime, the output voltage of operational amplifier U1 diminishes, and flows into the electric current I of a NMOS pipe Q1
2diminish, the charging current I of charge and discharge capacitance C
1become large, thereby gradually shortened in the charging interval of charge and discharge capacitance C, diminish the cycle of oscillation of oscillator 1012, and the ramp control by 102 pairs of charge and discharge capacitance C charging currents of diverter module makes gradual change cycle of oscillation of oscillator 1012, and then reaches the object of DC-DC change-over circuit soft start.
embodiment bis-:
Fig. 5 shows the modular structure figure of the diverter module that second embodiment of the invention provides, and for convenience of explanation, only lists the part relevant to the embodiment of the present invention, and details are as follows:
As shown in Figure 5, as one embodiment of the invention, diverter module 102 comprises:
The one PMOS field effect transistor Q3, the 2nd PMOS field effect transistor Q4, the 3rd PMOS field effect transistor Q5, the 4th NMOS field effect transistor Q6 and second switch pipe 1022;
The grid of the one PMOS field effect transistor Q3 is the first power end of diverter module 102, the source electrode of the one PMOS field effect transistor Q3 is connected with the drain electrode of the 2nd PMOS field effect transistor Q4 and the source electrode of the 3rd PMOS field effect transistor Q5, the 2nd grid of PMOS field effect transistor Q4 and the bias current output of DC-DC change-over circuit are connected, the source electrode of the 2nd PMOS field effect transistor Q4 is connected with the power end of DC-DC change-over circuit, the grid of the 3rd PMOS field effect transistor Q5 is the second source end of diverter module 102, the drain electrode of the 3rd PMOS field effect transistor Q5 is connected with the drain electrode of the 4th NMOS field effect transistor Q6 and the grid of the 4th NMOS field effect transistor Q6, the source electrode of the drain electrode of the one PMOS field effect transistor Q3 and the 4th NMOS field effect transistor Q6 is connected to the cold end of second switch pipe 1022 altogether, the grid of the 4th NMOS field effect transistor Q6 is connected with the control end of second switch pipe 1022, the hot end of second switch pipe 1022 is the input of diverter module 102, the cold end of second switch pipe is the cold end of second switch pipe 1022.
As shown in Figure 6, as one embodiment of the invention, second switch pipe 1022 is the 2nd NMOS pipe Q7;
The grid of the 2nd NMOS pipe Q7 is the control end of second switch pipe 1022, and the drain electrode of the 2nd NMOS pipe Q7 is the hot end of second switch pipe 1022, and the source electrode of the 2nd NMOS pipe Q7 is the cold end of second switch pipe 1022.
As shown in Figure 7, as one embodiment of the invention, second switch pipe 1022 is the 2nd NPN type triode Q8;
The base stage of the 2nd NPN type triode Q8 is the control end of second switch pipe 1022, and the base stage of the 2nd NPN type triode Q8 is the hot end of second switch pipe 1022, and the transmitting of the 2nd NPN type triode Q8 is the cold end of second switch pipe 1022 very.
The operation principle of the diverter module below second embodiment of the invention being provided be take second switch pipe 1022 and is described as the 2nd NMOS pipe Q7:
After DC-DC change-over circuit powers on, now oscillator 1012 is started working, because the output voltage of DC-DC change-over circuit is slowly risen by low level, so feedback voltage V
fBby 0V, started to rise equally, work as feedback voltage V
fBbe less than reference voltage V
rEFtime, the electric current that flows through the 3rd PMOS field effect transistor Q5 is greater than the circuit that flows through a PMOS field effect transistor Q3, after the 4th NMOS field effect transistor Q6 mirror image, flows into the electric current I of the 2nd NMOS pipe Q7
2along with flowing through the curent change of the 3rd PMOS field effect transistor Q5, change, have electric current to flow into diverter module 102, make the charging current I of charge and discharge capacitance C
1diminish, the charging interval is elongated, becomes the cycle of oscillation of oscillator 1012 large; Along with the output voltage of DC-DC change-over circuit becomes greatly gradually, feedback voltage V now
fBalso becoming large, thereby control the electric current that flows through the 3rd PMOS field effect transistor Q5, diminishing, and then flow into the electric current I of the 2nd NMOS pipe Q7
2diminish, thus the charging current I of charge and discharge capacitance C
1become large, the charging interval shortens gradually, and the ramp control that the cycle diminishes by 102 pairs of charge and discharge capacitance C charging currents of diverter module makes gradual change cycle of oscillation of oscillator 1012, and then reaches the object of DC-DC change-over circuit soft start.
In first embodiment of the invention and the second embodiment, the circuit structure in diverter module 102 in face of the first switching tube 1021 and second switch pipe 1022 is not limited to above-mentioned two kinds, so long as adopt the feedback voltage V of DC-DC change-over circuit output
fBwith reference voltage V
rEFcompare, according to comparative result, control shunt current I
2big or small method all belong to the content of the present invention protection.
The present invention also provides a kind of DC-DC chip, and this DC-DC chip comprises above-mentioned arbitrary described DC-DC change-over circuit.
In embodiments of the present invention, according to the variation of the feedback voltage of DC-DC output, controlling diverter module shunts the charging current of charge and discharge capacitance, thereby change the charging current of charge-discharge modules, and then the charging interval of change charge-discharge modules, further make change the cycle of oscillation of oscillating circuit, reach the object of soft start, DC-DC change-over circuit provided by the invention can regulate its soft-start period, and do not need chip dedicated pin and do not need to increase the capacity of charge and discharge capacitance, simplicity of design, reduced the cost of circuit, and the surge current of output can suppress circuit start time, eliminate voltage overshoot.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a DC-DC change-over circuit, comprises the oscillating circuit of controlling described DC-DC change-over circuit soft-start period, and described oscillating circuit comprises the charge-discharge modules being connected with charge power supply, it is characterized in that, described DC-DC change-over circuit also comprises:
The first power end is connected with pressure feedback port with the reference voltage output terminal of described DC-DC change-over circuit respectively with second source end, input is connected with the charging circuit of described charge-discharge modules, output head grounding, for shunting to regulate the diverter module of described cycle of oscillation at the electric current of charging process to described charge-discharge modules according to the variation of the feedback voltage of described DC-DC change-over circuit.
2. DC-DC change-over circuit as claimed in claim 1, is characterized in that, described oscillating circuit also comprises the oscillator that generates oscillator signal.
3. DC-DC change-over circuit as claimed in claim 1, is characterized in that, described charge-discharge modules comprises at least one charge and discharge capacitance.
4. DC-DC change-over circuit as claimed in claim 1, is characterized in that, described diverter module comprises the first operational amplifier and the first switching tube;
The inverting input of described the first operational amplifier is the first power end of described diverter module, the normal phase input end of described the first operational amplifier is the second source end of described diverter module, the output of described operational amplifier is connected with the control end of described the first switching tube, the hot end of described the first switching tube is the input of described diverter module, the output that the cold end of described the first switching tube is described diverter module.
5. DC-DC change-over circuit as claimed in claim 4, is characterized in that, described the first switching tube is a NMOS pipe;
The grid of a described NMOS pipe is the control end of described the first switching tube, and the drain electrode of a described NMOS pipe is the hot end of described the first switching tube, and the source electrode of a described NMOS pipe is the cold end of described the first switching tube.
6. DC-DC change-over circuit as claimed in claim 4, is characterized in that, described the first switching tube is a NPN type triode;
The base stage of a described NPN type triode is the control end of described the first switching tube, and the base stage of a described NPN type triode is the hot end of described the first switching tube, the cold end of very described first switching tube of transmitting of a described NPN type triode.
7. DC-DC change-over circuit as claimed in claim 1, is characterized in that, described diverter module comprises:
The one PMOS field effect transistor, the 2nd PMOS field effect transistor, the 3rd PMOS field effect transistor, the 4th NMOS field effect transistor and second switch pipe;
The grid of a described PMOS field effect transistor is the first power end of described diverter module, the source electrode of a described PMOS field effect transistor is connected with the drain electrode of described the 2nd PMOS field effect transistor and the source electrode of described the 3rd PMOS field effect transistor, the grid of described the 2nd PMOS field effect transistor is connected with the bias current output of described DC-DC change-over circuit, the source electrode of described the 2nd PMOS field effect transistor is connected with the power end of described DC-DC change-over circuit, the grid of described the 3rd PMOS field effect transistor is the second source end of described diverter module, the drain electrode of described the 3rd PMOS field effect transistor is connected with the drain electrode of described the 4th NMOS field effect transistor and the grid of described the 4th NMOS field effect transistor, the source electrode of the drain electrode of a described PMOS field effect transistor and described the 4th NMOS field effect transistor is connected to the cold end of described second switch pipe altogether, the grid of described the 4th NMOS field effect transistor is connected with the control end of described second switch pipe, the hot end of described second switch pipe is the input of described diverter module, the cold end of described second switch pipe is the cold end of described second switch pipe.
8. DC-DC change-over circuit as claimed in claim 7, is characterized in that, described second switch pipe is the 2nd NMOS pipe;
The grid of described the 2nd NMOS pipe is the control end of described second switch pipe, and the drain electrode of described the 2nd NMOS pipe is the hot end of described second switch pipe, and the source electrode of described the 2nd NMOS pipe is the cold end of described second switch pipe.
9. DC-DC change-over circuit as claimed in claim 7, is characterized in that, described second switch pipe is the 2nd NPN type triode;
The base stage of described the 2nd NPN type triode is the control end of described second switch pipe, and the base stage of described the 2nd NPN type triode is the hot end of described second switch pipe, the cold end of the very described second switch pipe of transmitting of described the 2nd NPN type triode.
10. a DC-DC chip, is characterized in that, described DC-DC chip comprises the DC-DC change-over circuit as described in as arbitrary in claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310554340.4A CN103560665A (en) | 2013-11-08 | 2013-11-08 | DC-DC conversion circuit and DC-DC chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310554340.4A CN103560665A (en) | 2013-11-08 | 2013-11-08 | DC-DC conversion circuit and DC-DC chip |
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| CN103560665A true CN103560665A (en) | 2014-02-05 |
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| CN201310554340.4A Pending CN103560665A (en) | 2013-11-08 | 2013-11-08 | DC-DC conversion circuit and DC-DC chip |
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| CN104617756A (en) * | 2015-01-26 | 2015-05-13 | 苏黎 | Switching power supply circuit and switching power supply |
| CN107148737A (en) * | 2014-12-22 | 2017-09-08 | 三菱电机株式会社 | Power conversion device and power semiconductor module |
| CN108429445A (en) * | 2017-02-13 | 2018-08-21 | 珠海全志科技股份有限公司 | A kind of soft starting circuit applied to charge pump |
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Application publication date: 20140205 |