CN102739048B - Voltage conversion circuit - Google Patents
Voltage conversion circuit Download PDFInfo
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- CN102739048B CN102739048B CN201210080877.7A CN201210080877A CN102739048B CN 102739048 B CN102739048 B CN 102739048B CN 201210080877 A CN201210080877 A CN 201210080877A CN 102739048 B CN102739048 B CN 102739048B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a voltage conversion circuit, which converts an input voltage into any positive voltage and negative voltage through a simple structure. The voltage conversion circuit (100) comprises a transistor (Tr1-Tr5), a coil (L), and a control circuit (10). The control circuit (10) enables the transistor (Tr1, Tr2) to be conducted and the transistor (Tr3, Tr4, Tr5) to be stopped during a power-charging period of a first period and a second period; the control circuit (10) enables the transistor (Tr3, Tr4) to be conducted and the transistor (Tr1, Tr2, Tr5) to be stopped during a power-discharging period of the first period; the control circuit (10) enables the transistor (Tr2, Tr5) to be conducted and the transistor (Tr1, Tr3, Tr4) to be stopped during the power-discharging period of the second period.
Description
Technical field
The present invention relates to generate the technology of positive voltage and negative voltage.
Background technology
As given positive voltage being transformed to larger positive voltage and the voltage conversion circuit of negative voltage, be known to use the scheme of charge pump (charge pump).Charge pump circuit below disclosing in patent documentation 1, when input voltage is VDD, is used two capacity cells and seven switch elements, export+2VDD and-2VDD.
Prior art document
Patent documentation 1: Japanese kokai publication hei 6-165482 communique
But, in the technology of patent documentation 1, owing to using seven switch elements, therefore form complicated, and, need to be at suitable these switch elements of timing ON/OFF, the formation that therefore causes controlling the control circuit of seven switch units also becomes complicated.In addition, need to make to equate from the positive voltage of charge pump circuit output and the absolute value of negative voltage, existence cannot be specified the problem of arbitrary size.
Summary of the invention
The problem that invention will solve
Consider above situation, the problem that the present invention solves is, simplifies when forming, and by input voltage, generates positive voltage and negative voltage arbitrarily.
For the means of dealing with problems
To in order to solve above problem, means of the present invention describe.In addition, below explanation is not intended to limit the scope of the invention.
Voltage conversion circuit of the present invention, is characterized in that, has: the first terminal, and supply with and have input voltage; The second terminal, is connected with a side's of coil terminal; The 3rd terminal, is connected with the opposing party's of above-mentioned coil terminal; The 4th terminal, supplies with and has earthed voltage; Five-terminals, output positive voltage; The 6th terminal, output negative voltage; The first switch element, is arranged between above-mentioned the first terminal and above-mentioned the second terminal; Second switch element, is arranged between above-mentioned the 3rd terminal and above-mentioned the 4th terminal; The 3rd switch element, is arranged between above-mentioned the second terminal and above-mentioned the 4th terminal; The 4th switch element, is arranged between above-mentioned the 3rd terminal and above-mentioned Five-terminals; The 5th switch element, is arranged between above-mentioned the second terminal and above-mentioned the 6th terminal; And control circuit, controlling above-mentioned the first switch element makes above-mentioned the first switch element to above-mentioned the 5th switch element conducting or cut-off to above-mentioned the 5th switch element, so that in first period, generate above-mentioned positive voltage and generate above-mentioned negative voltage in the second phase, above-mentioned control circuit, between the charge period of above-mentioned first period, make above-mentioned the first switch element and above-mentioned second switch element conductive and make above-mentioned the 3rd switch element, above-mentioned the 4th switch element and above-mentioned the 5th switch element cut-off; Follow-up interdischarge interval between the charge period of above-mentioned first period, makes above-mentioned the 3rd switch element and above-mentioned the 4th switch element conducting and makes above-mentioned the first switch element, above-mentioned second switch element and above-mentioned the 5th switch element cut-off; Between the charge period of the above-mentioned second phase, make above-mentioned the first switch element and above-mentioned second switch element conductive and make above-mentioned the 3rd switch element, above-mentioned the 4th switch element and above-mentioned the 5th switch element cut-off; Follow-up interdischarge interval between the charge period of the above-mentioned second phase, makes above-mentioned second switch element and above-mentioned the 5th switch element conducting and makes above-mentioned the first switch element, above-mentioned the 3rd switch element and above-mentioned the 4th switch element cut-off.
According to the present invention, between the charge period of first period and the second phase, make electric current flow through and electric power is stored into coil to equidirectional, interdischarge interval during the first phase spues electric current and exports positive voltage from Five-terminals, on the other hand, at the interdischarge interval of the second phase, by sucking electric current from the 6th terminal, export negative voltage.Thus, by a coil and five switch elements, can export the both sides of positive voltage and negative voltage.Therefore, compared with prior art, can simplify and form and minimizing switch element etc.In addition, can simplify the formation of the control circuit of control switch element.And, by controlling independently between the charge period of first period and between the length of interdischarge interval and the charge period of the second phase and the length of interdischarge interval, can set independently the absolute value of positive voltage and the absolute value of negative voltage.
As optimal way of the present invention, above-mentioned control circuit is at the follow-up stopping period of the interdischarge interval of above-mentioned first period and the follow-up stopping period of the interdischarge interval of the above-mentioned second phase, makes above-mentioned second switch element and above-mentioned the 3rd switch element conducting and makes above-mentioned the first switch element, above-mentioned the 4th switch element and above-mentioned the 5th switch element cut-off.Now, at stopping period, the electric power that makes to store in coil becomes zero, thus can be in coil between next charge period residual electric power.Therefore, can correctly control the size of positive voltage and the size of negative voltage.
As optimal way of the present invention, have: the first test section, at the interdischarge interval of above-mentioned first period, detecting the electric current that flows through above-mentioned coil is that zero situation is exported the first detection signal; And second test section, at the interdischarge interval of the above-mentioned second phase, detecting the electric current that flows through above-mentioned coil is that zero situation is exported the second detection signal, above-mentioned control circuit, based on above-mentioned the first detection signal, finish the interdischarge interval of above-mentioned first period, based on above-mentioned the second detection signal, finish the interdischarge interval of the above-mentioned second phase.Now, the size of magnetic test coil electric current and finish interdischarge interval, therefore can export the electric power storing in coil efficiently.
Particularly, preferably above-mentioned the first test section is the first comparator that a side the voltage of terminal of above-mentioned the 3rd switch element and above-mentioned the 4th switch element and the voltage of the opposing party's terminal are compared, and above-mentioned the second test section is and a side the voltage of terminal of above-mentioned five switch element and second comparator that the voltage of the opposing party's terminal compare first to above-mentioned second switch.
As optimal way of the present invention, have: first signal generation unit, the first signal of the pulse duration of the Differential correspondence of generation and above-mentioned positive voltage and given voltage; And secondary signal generation unit, the secondary signal of the pulse duration of the Differential correspondence of generation and above-mentioned negative voltage and given voltage, above-mentioned control circuit, based on above-mentioned first signal, the length between the charge period of above-mentioned first period is controlled, based on above-mentioned secondary signal, the length between the charge period of the above-mentioned second phase is controlled.According to the present invention, independently control the pulse duration of first signal and the pulse duration of secondary signal, therefore can export positive voltage and the negative voltage of arbitrary size.
Accompanying drawing explanation
Fig. 1 is the block diagram of the voltage conversion circuit that relates to of embodiment of the present invention.
Fig. 2 is the sequential chart of each signal.
Fig. 3 is for for illustrating the key diagram of the transistorized conduction and cut-off between the charge period of first period and the second phase.
Fig. 4 is for for illustrating the key diagram of transistorized conduction and cut-off of the interdischarge interval of first period.
Fig. 5 is for for illustrating the key diagram of transistorized conduction and cut-off of the stopping period of first period and the second phase.
Fig. 6 is for for illustrating the key diagram of transistorized conduction and cut-off of the interdischarge interval of the second phase.
Description of reference numerals
100: voltage conversion circuit; T1～T8: terminal; TR1～TR5: transistor; L: coil; 10: control circuit; 11: triangle wave generating circuit; 12,13,17,18: comparator; 15,16: amplifier; 20: DC power supply circuit; 21～23: capacity cell; S1～S5: control signal; V1: the first voltage; V2: second voltage.
Embodiment
< execution mode >
Fig. 1 is the block diagram of the voltage conversion circuit 100 that relates to of embodiment of the present invention.Voltage conversion circuit 100 is to being supplied to that input voltage VDD between terminal T1 and terminal T4 changes and from terminal T5 output positive voltage Vp and from the power circuit (DC-DC converter) of terminal T6 output negative voltage Vn.DC power supply circuit 20 is supplied with input voltage VDD between terminal T1 and terminal T4.Terminal T4 ground connection.And the electric capacity 21 arranging between terminal T1 and T4 is for by input voltage VDD smoothing.Reference voltage V ref supplies with to terminal T7, and clock signal clk is supplied with to terminal T8.And capacity cell 22 is connected with terminal T5, capacity cell 23 is connected with terminal T6.Capacity cell 22 and 23 is for carrying out smoothing by positive voltage Vp and negative voltage Vn.
Voltage conversion circuit 100 has: as the transistor Tr 1 of P raceway groove and transistor Tr 2, Tr3 and the Tr5 of Tr4 and N raceway groove of switch element performance function.Control signal S1～S5 that these transistors generate by control circuit 10 is controlled so as to conduction and cut-off.Transistor Tr 1 is arranged between terminal T1 and terminal T2, whether controls the terminal feeding to a side of coil L by input voltage VDD.Whether transistor Tr 2 is arranged between terminal T3 and terminal T4, control by the opposing party's of coil L terminal ground connection.Whether transistor Tr 3 is arranged between terminal T2 and terminal T4, control by a side's of coil L terminal ground connection.Transistor Tr 4 is arranged between terminal T3 and terminal T5, controls and whether exports positive voltage Vp.Transistor Tr 5 is arranged between terminal T2 and terminal T6, controls and whether exports negative voltage Vn.
Comparator 12 (the second test section) is arranged in parallel with transistor Tr 2, when coil current IL is zero, generates from high level and is switched to low level detection signal X2 and supplies with to control circuit 10.Comparator 13 (the first test section) is arranged in parallel with transistor Tr 3, when coil current IL is zero, generates from high level and is switched to low level detection signal X1 and supplies with to control circuit 10.
In addition, triangle wave generating circuit 11 synchronously generates triangular signal Vramp with clock signal clk.The difference of amplifier 15 based on positive voltage Vp and reference voltage V ref and generated error signal Err1, the difference of amplifier 16 based on negative voltage Vn and reference voltage V ref and generated error signal Err2.Comparator 17 is triangular signal Vramp and error signal Err1 and generate pwm signal P1 and to control circuit 10 outputs relatively.Comparator 18 is triangular wave Vramp and error signal Err2 and generate pwm signal P2 and to control circuit 10 outputs relatively.
Control circuit 10, based on detection signal X1 and X2, clock signal clk, pwm signal P1 and P2, generates control signal S1～S5.In above formation, the pulse duration of pwm signal P1 is longer, and positive voltage Vp is larger, and the pulse duration of pwm signal P2 is longer, and the absolute value of negative voltage Vn is larger.Pwm signal P1 and pwm signal P2 are by triangular signal Vramp and error signal Err1 and Err2 being compared and generated, therefore by the gain of resonance-amplifier 15 and 16, can setting the size of positive voltage Vp and negative voltage Vn.
Then, the action of voltage conversion circuit 100 is described.The action of voltage conversion circuit 100 is roughly divided into the first period Ta that generates positive voltage Vp and the second phase Tb that generates negative voltage Vn, and first period Ta and second phase Tb is divided between charge period separately, interdischarge interval and stopping period.Fig. 2 is for representing the sequential chart of waveform of each portion of voltage conversion circuit, and Fig. 3～Fig. 6 is for for illustrating the key diagram of the conduction and cut-off of transistor Tr 1～Tr5.
As shown in Figure 2, clock signal clk starting as high level at first period Ta and second phase Tb.Triangle wave generating circuit 11 synchronously resets the level of triangular signal Vramp with the rising of clock signal clk.Pwm signal P1 only becomes effectively (high level) during corresponding with error signal Err1, and pwm signal P2 only becomes effectively (high level) during corresponding with error signal Err2.Control circuit 10 using pwm signal P1 effectively during as between the charge period of first period Ta, using pwm signal P2 effectively during as between the charge period of second phase Tb.
First, between the charge period of first period Ta, control circuit 10 makes control signal S1 and S2 effectively (on), and makes control signal S3～S5 invalid (off).Consequently, as shown in Figure 3, transistor Tr 1 and Tr2 conducting and transistor Tr 3～Tr5 cut-off.Between charge period, current flowing in the such path of DC power supply circuit 20 → terminal T1 → transistor Tr 1 → terminal T2 → coil L → terminal T3 → transistor Tr 2 → terminal T4 → ground connection.Now, the voltage of a side's of coil L terminal i.e. the first voltage V1 be take the ground connection voltage positive as benchmark becomes, and the voltage of the opposing party's of coil L terminal is that second voltage V2 is called earthed voltage (GND).Between charge period, electric current I L flow into coil L via transistor Tr 1, and thus, the electric current I L that flows through coil L increases gradually, in coil L, stores electric power.
Then, the interdischarge interval of first period Ta is start and finish when the decline E1 of detection signal X1 from the end between charge period.As mentioned above, when coil current IL is zero, detection signal X1 switches to low level from high level.Therefore, the interdischarge interval of first period Ta is from finishing between charge period till coil current IL becomes during zero.At the interdischarge interval of first period Ta, control circuit 10 make control signal S3 and S4 effective, and make control signal S1, S2 and S5 invalid.Consequently, as shown in Figure 4, transistor Tr 3 and Tr4 conducting and transistor Tr 1, Tr2 and Tr5 cut-off.At interdischarge interval, current flowing in the such path of ground connection → terminal T4 → transistor Tr 3 → terminal T2 → coil L → terminal T3 → transistor Tr 4 → terminal T5.Now, the voltage of the opposing party's of coil L terminal is that second voltage V2 be take the ground connection voltage positive as benchmark becomes, and the voltage of a side's of coil L terminal the first voltage V1 be called earthed voltage (GND).At the interdischarge interval of first period Ta, second voltage V2 exports as positive voltage Vp from terminal T5 via transistor Tr 4.Positive voltage Vp generates by being stored in the electric power of coil L between the charge period at first period Ta.
Then, the stopping period of first period Ta is to start and finish when clock signal clk becomes high level from the end of interdischarge interval.During this period, control circuit 10 make control signal S2 and S3 effective, and make control signal S1, S4 and S5 invalid.Consequently, transistor Tr 2 and Tr3 conducting as shown in Figure 5, and transistor Tr 1, Tr4 and Tr5 cut-off.At stopping period, terminal T2 and the equal ground connection of terminal T3.Therefore, the first voltage V1 and the second voltage V2 of coil L become earthed voltage.
Then, between the charge period of second phase Tb and between the charge period of stopping period and first period Ta and stopping period similarly move.
Then, the interdischarge interval of second phase Tb is start and finish when the decline E2 of detection signal X2 from the end between charge period.As mentioned above, when coil current IL is zero, detection signal X2 switches to low level from high level.Therefore, the interdischarge interval of second phase Tb be from the end between charge period to coil current IL, be zero during.
At the interdischarge interval of second phase Tb, control circuit 10 make control signal S2 and S5 effective, and make control signal S1, S3 and S invalid.Consequently, as shown in Figure 6, transistor Tr 2 and Tr5 conducting and transistor Tr 1, Tr3 and Tr4 cut-off.At interdischarge interval, current flowing in the such path of terminal T6 → transistor Tr 5 → terminal T2 → coil L → terminal T3 → transistor Tr 2 → terminal T4 → ground connection.That is, from terminal T6 to the direction current flowing sucking.Now, the voltage of a side's of coil L terminal the first voltage V1 take ground connection negative as benchmark becomes voltage, and the voltage of the opposing party's of coil L terminal to be second voltage V2 become earthed voltage (GND).At the interdischarge interval of second phase Tb, the first voltage V1 exports as negative voltage Vn from terminal T6 via transistor Tr 5.Negative voltage Vn generates by being stored in the electric power of coil L between the charge period at second phase Tb.
As mentioned above, according to present embodiment, when the electric power storing in coil 1 is discharged, in coil L with charge period between identical direction current flowing, and switch current path and the electric current that spues when output positive voltage Vp, on the other hand, when output negative voltage Vn, suck electric current, therefore can use a coil L to generate positive and negative voltage.And, compare with existing charge pump, can cut down transistorized number.In addition,, according to present embodiment, can set independently the size of positive voltage Vp and negative voltage Vn.
< variation >
The invention is not restricted to above-mentioned execution mode, for example, can carry out following distortion.
(1) in the above-described embodiment, whether the coil current IL that detects the interdischarge interval of first period Ta by comparator 13 is zero, but the invention is not restricted to this, as long as can use various means by monitoring cable loop current IL.The test section of magnetic test coil electric current I L is set on the current path flowing through at coil current IL in a word.For example, can comparator 13 be set in parallel with transistor Tr 4.
(2) in the above-described embodiment, by the coil current IL in the interdischarge interval of comparator 12 detection second phase Tb, whether be zero, but the invention is not restricted to this, as long as can use various means by monitoring cable loop current IL.The test section of magnetic test coil electric current I L is set on the current path flowing through at coil current IL in a word.For example, can comparator 12 be set in parallel with transistor Tr 5.
In addition, in the formation of above-mentioned Fig. 1, for example, also can adopt the formation to voltage conversion circuit 100 peripheral hardware coil L.Similarly, DC power supply circuit 20 and capacity cell 21～23 can adopt the formation to voltage conversion circuit 100 peripheral hardwares similarly.
Large scale integrated circuit) etc. in addition, also can adopt voltage conversion circuit such as being embedded into LSI (Large-Scale Integrated Circuit: formation.
In addition, also the voltage conversion circuit of above-mentioned execution mode 100 for example can be applicable to digital amplifier.In addition, also the voltage conversion circuit of above-mentioned execution mode 100 for example can be applicable to Earphone Amplifier.
In addition, in the above-described embodiment as an example, the scope that the voltage of input voltage VDD can be in 1.8～2.8V, and then can be for example 2.6V.In addition, as an example, the scope that the voltage of positive voltage Vp can be in 0.5～2.2V, and then can be for example 1.8V.In addition, as an example, the scope that the voltage of negative voltage Vn can be in-0.5～-2.2V, and then can be-1.8V for example.In addition, amplifier 15 and 16 gain, for example, can be 80dB.
Claims (8)
1. a voltage conversion circuit, is characterized in that,
Have:
The first terminal, supplies with and has input voltage;
The second terminal, is connected with a side's of coil terminal;
The 3rd terminal, is connected with the opposing party's of above-mentioned coil terminal;
The 4th terminal, supplies with and has earthed voltage;
Five-terminals, output positive voltage;
The 6th terminal, output negative voltage;
The first switch element, is arranged between above-mentioned the first terminal and above-mentioned the second terminal;
Second switch element, is arranged between above-mentioned the 3rd terminal and above-mentioned the 4th terminal;
The 3rd switch element, is arranged between above-mentioned the second terminal and above-mentioned the 4th terminal;
The 4th switch element, is arranged between above-mentioned the 3rd terminal and above-mentioned Five-terminals;
The 5th switch element, is arranged between above-mentioned the second terminal and above-mentioned the 6th terminal;
Control circuit, controls above-mentioned the first switch element and makes above-mentioned the first switch element to above-mentioned the 5th switch element conducting or cut-off to above-mentioned the 5th switch element, so that generate above-mentioned positive voltage in first period and generate above-mentioned negative voltage in the second phase;
The first test section, at the interdischarge interval of above-mentioned first period, detecting the electric current that flows through above-mentioned coil is that zero situation is exported the first detection signal; And
The second test section, at the interdischarge interval of the above-mentioned second phase, detecting the electric current that flows through above-mentioned coil is that zero situation is exported the second detection signal,
Above-mentioned control circuit,
Between the charge period of above-mentioned first period, make above-mentioned the first switch element and above-mentioned second switch element conductive, make above-mentioned the 3rd switch element, above-mentioned the 4th switch element and above-mentioned the 5th switch element cut-off,
Follow-up interdischarge interval between the charge period of above-mentioned first period, makes above-mentioned the 3rd switch element and above-mentioned the 4th switch element conducting, makes above-mentioned the first switch element, above-mentioned second switch element and above-mentioned the 5th switch element cut-off,
Between the charge period of the above-mentioned second phase, make above-mentioned the first switch element and above-mentioned second switch element conductive, make above-mentioned the 3rd switch element, above-mentioned the 4th switch element and above-mentioned the 5th switch element cut-off,
Follow-up interdischarge interval between the charge period of the above-mentioned second phase, makes above-mentioned second switch element and above-mentioned the 5th switch element conducting, makes above-mentioned the first switch element, above-mentioned the 3rd switch element and above-mentioned the 4th switch element cut-off,
Based on above-mentioned the first detection signal, finish the interdischarge interval of above-mentioned first period, based on above-mentioned the second detection signal, finish the interdischarge interval of the above-mentioned second phase.
2. voltage conversion circuit according to claim 1, is characterized in that,
Above-mentioned control circuit is at the follow-up stopping period of the interdischarge interval of above-mentioned first period and the follow-up stopping period of the interdischarge interval of the above-mentioned second phase, make above-mentioned second switch element and above-mentioned the 3rd switch element conducting, make above-mentioned the first switch element, above-mentioned the 4th switch element and above-mentioned the 5th switch element cut-off.
3. voltage conversion circuit according to claim 1, is characterized in that,
Above-mentioned the first test section is the first comparator that a side the voltage of terminal of above-mentioned the 3rd switch element and above-mentioned the 4th switch element and the voltage of the opposing party's terminal are compared,
Above-mentioned the second test section is the second comparator that a side the voltage of terminal of above-mentioned second switch element and above-mentioned the 5th switch element and the voltage of the opposing party's terminal are compared.
4. voltage conversion circuit according to claim 1 and 2, is characterized in that,
Have:
First signal generation unit, the first signal of the pulse duration of the Differential correspondence of generation and above-mentioned positive voltage and given voltage; And
Secondary signal generation unit, the secondary signal of the pulse duration of the Differential correspondence of generation and above-mentioned negative voltage and given voltage,
Above-mentioned control circuit, controls the length between the charge period of above-mentioned first period based on above-mentioned first signal, based on above-mentioned secondary signal, the length between the charge period of the above-mentioned second phase is controlled.
5. voltage conversion circuit according to claim 1, is characterized in that,
Have:
First signal generation unit, the first signal of the pulse duration of the Differential correspondence of generation and above-mentioned positive voltage and given voltage; And
Secondary signal generation unit, the secondary signal of the pulse duration of the Differential correspondence of generation and above-mentioned negative voltage and given voltage,
Above-mentioned control circuit, controls the length between the charge period of above-mentioned first period based on above-mentioned first signal, based on above-mentioned secondary signal, the length between the charge period of the above-mentioned second phase is controlled.
6. voltage conversion circuit according to claim 3, is characterized in that,
Have:
First signal generation unit, the first signal of the pulse duration of the Differential correspondence of generation and above-mentioned positive voltage and given voltage; And
Secondary signal generation unit, the secondary signal of the pulse duration of the Differential correspondence of generation and above-mentioned negative voltage and given voltage,
Above-mentioned control circuit, controls the length between the charge period of above-mentioned first period based on above-mentioned first signal, based on above-mentioned secondary signal, the length between the charge period of the above-mentioned second phase is controlled.
7. a digital amplifier, is characterized in that,
Possesses voltage conversion circuit claimed in claim 1.
8. an Earphone Amplifier, is characterized in that,
Possesses voltage conversion circuit claimed in claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-073735 | 2011-03-29 | ||
| JP2011073735A JP2012210063A (en) | 2011-03-29 | 2011-03-29 | Voltage conversion circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102739048A CN102739048A (en) | 2012-10-17 |
| CN102739048B true CN102739048B (en) | 2014-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210080877.7A Expired - Fee Related CN102739048B (en) | 2011-03-29 | 2012-03-23 | Voltage conversion circuit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2012210063A (en) |
| KR (1) | KR101288861B1 (en) |
| CN (1) | CN102739048B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753318B (en) * | 2013-12-27 | 2017-06-30 | 展讯通信（上海）有限公司 | A kind of Switching Power Supply for being depressured negative boosting |
| CN104753475B (en) * | 2013-12-27 | 2018-10-16 | 展讯通信（上海）有限公司 | X class A amplifier As |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1228599A (en) * | 1998-02-03 | 1999-09-15 | 日本电气株式会社 | Power source circuit for generating positive and negative voltage sources |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5883793A (en) | 1998-04-30 | 1999-03-16 | Lucent Technologies Inc. | Clamp circuit for a power converter and method of operation thereof |
| US7256568B2 (en) | 2004-05-11 | 2007-08-14 | The Hong Kong University Of Science And Technology | Single inductor multiple-input multiple-output switching converter and method of use |
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| JP5451123B2 (en) * | 2009-03-17 | 2014-03-26 | スパンション エルエルシー | Power supply device, power supply control device, and control method for power supply device |
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2011
- 2011-03-29 JP JP2011073735A patent/JP2012210063A/en active Pending
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2012
- 2012-03-19 KR KR1020120027840A patent/KR101288861B1/en not_active IP Right Cessation
- 2012-03-23 CN CN201210080877.7A patent/CN102739048B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1228599A (en) * | 1998-02-03 | 1999-09-15 | 日本电气株式会社 | Power source circuit for generating positive and negative voltage sources |
Non-Patent Citations (1)
| Title |
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| JP特开2008-148514A 2008.06.26 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102739048A (en) | 2012-10-17 |
| JP2012210063A (en) | 2012-10-25 |
| KR101288861B1 (en) | 2013-07-23 |
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