TW201223096A - Freewheel charge-pump controlled single-inductor multiple-output DC-DC converter - Google Patents

Abstract

This present invention disclose a freewheel charge-pump controlled single-inductor multiple-output DC-DC converter. The single-inductor multiple-output (SIMO) DC-DC converter is comprising a single-inductor multiple-output (SIMO) converting circuit and a controlling circuit. The SIMO converting circuit is further including at least one charge-pump where a charge storage device is included. By means of the charge storage function, in the state of pulse-frequency width modulation (PWM) switching, an added DC-DC output can be derived. The present invention provides the freewheel charge-pump control technique (FCPC) that leads the SIMO DC-DC converter to operate in the pseudo-continuous conduction mode (PCCM) and discontinuous conduction mode (DCM) by time-multiplexing control. A better crossover regulation and higher output current can be achieved.

Description

201223096 VI. Description of the Invention: [Technical Field of the Invention] [0001] The present invention relates to a single-inductor multi-output DC converter with charge pump control, and more particularly to using a forward-pass charge pump to control multiple outputs The technology of DC to DC converters. [Previous Technology·] [0002] With the rapid development of consumer electronic products, the demand for small and small devices is even more varied, such as personal digital assistants (PDAs), mobile phones, digital cameras, etc. In the circuit design of electronic equipment, the orientation towards high-density systems has become a necessary trend, and reducing the number of electronic components as much as possible has become one of the goals pursued by the wafer design. High-efficiency DC-to-DC converters have always played an important role in improving the power management of portable devices and how to increase battery usage. Therefore, how to design a power converter with small size, high efficiency and low input voltage is a big challenge in the design. [0003] In DC-to-DC conversion circuits, the phenomenon of crossover distortion persists. Many of the literatures published in previous research, papers, products, or patents are often devoted to reducing crossover distortion or using various Method to reduce the influence of crossover distortion; especially in the circuit of DC-to-DC voltage converter, since the relationship between voltage and current is not linear, when the input voltage is low, the output voltage has a dead zone. The output voltage forms a nonlinear relationship with the input voltage, creating a problem of crossover regu 1 at i on. [0004] For DC voltage conversion circuits, the architecture of single inductor multiple output 099140461 Form No. A0101 Page 4 / Total 35 Page 0992070452-0 201223096 (single-inductor mul tipi e-out put) continues to suffer due to its high conversion efficiency. Pay attention to; single-inductor and multi-output DC voltage conversion circuits can be divided into two categories, which are divided into single-energy single-charge multi-discharge period (single energizing cycle per swing period) and single-cycle multiple charge and discharge mode (muitipl e ener-

Sizing cycle per swing period), the former such as Taiwan patent TW508869, US patent US 6075295, under this circuit architecture. In order to meet the demand that the load can change with the demand, complex control circuits composed of complex control theory are often needed to control, which makes it difficult to reduce costs. For the single-cycle multiple charge and discharge mode, for example, US Pat. No. 7,224,085 discloses a single-inductor dual-output (SID0) voltage conversion circuit, and US Patent No. 7,256,568, US 7,432,614, and Chinese patent public number CN1 01 083432 disclose the single. Single-inductor multiple-output (SIM0) voltage

The conversion circuit, although the crossover voltage has been reduced, can also use a less complex control architecture, the circuit topology is as shown in Fig. 1; in Fig. 1, the single inductor multiple output t voltage is known. The conversion circuit 10 uses a SFW (Freewheel switch), and when the switch S〇1 is turned on, when su is turned on

When the power supply Vgl charges the inductor L (when the Si2 is turned on, the power supply Vg2 charges the inductor L..... when the Sim is turned on, the power supply Vgm charges the inductor L); in the next stage, the switch S is turned on to output the switch S〇 1 conduction causes the inductor L to discharge 'generate voltage v〇l output, in the next phase, the output switch s is turned on 0 2 to discharge the inductor L' to generate a voltage V〇2 output, ..., in the next phase, the output switch S is turned on to make the inductor L discharge, generate voltage V output; to achieve multiple output on on. However, this type of circuit can reduce the problem of voltage stability. 099140461 Form No. A0101 Page 5 of 35 0992070452-0 201223096 Pressure problem, but there is a problem that the conversion efficiency is not high and the output voltage has a large ripple. [0005] In order to improve the conversion efficiency of the conversion circuit of the SIMO architecture, the problem is not high.

Dongsheng MA published "4卩361" in IEEE J. Solid-State Circuits, Vol.38, No.1, Jan. 2003 (3〇- CCM/DCM SIMO Switching Converter With Freewheel Switching, circuit diagram as shown in Figure 2, let The voltage conversion circuit operates in a pseudo-continuous conduction mode (PCCM) and a discontinuous conduction mode (DCM) in a time-multiplexing control. Voltage conversion; in the second In the figure, the voltage conversion circuit also uses a forward-conducting switch ~ to form a virtual continuous conduction mode single-inductor multiple output (pCCM SIM〇) ^ When the inductor L is charged, in the first phase, the switch is turned off, The output switch Sa is turned on to discharge the inductor L, and the voltage v is output. When the inductor [charges 0 3 is completed, the next phase must be turned on, the output switch is turned on, and the inductor L is discharged to generate the voltage V〇b output; please refer to 3, through the phase and output of this circuit, the current I after the voltage conversion changes more smoothly, and the straight L / current Idc is relatively high, that is, after the conversion through this circuit The voltage can reduce the problem of crossover regulation and provide higher output current; however, during the forward conduction switch, the circuit does not perform voltage conversion, which wastes time and power; and the virtual continuous conduction mode single inductor multiple output ( In order to increase the number of outputs, the PCCM SIM0) circuit must lengthen the operation cycle, and the longer the operation cycle will make the output voltage ripple larger. This problem still needs to be solved. 099140461 Form No. A0101 Page 6 of 35 0992070452 SUMMARY OF THE INVENTION [0006] In view of the above-mentioned problems of the prior art, one of the objects of the present invention is to provide a single-inductor multiple-output DC converter with charge pump control to solve the single-inductance multiple output of the prior art. During the forward-conversion switch of the DC converter, the circuit does not perform voltage conversion, which wastes time and power. The single-inductor multi-output DC converter with charge pump control is composed of single-inductor multi-output DC conversion circuit and control circuit. The single-inductor multi-output DC conversion circuit is configured to input the voltage of the DC terminal (vIN). Through the control circuit, the pulse width modulation control is converted into voltages of the two sets of Ο output DC terminals, which are respectively the voltage of the first output DC terminal (Vy) and the voltage of the second output DC terminal (v^); The single-inductor multi-output DC conversion circuit includes: [0007] (1) A single-inductance component, connected to the input DC terminal, is composed of a conduction switch (Sf) and an inductor (L), the conduction switch (Sf And the inductor (L) is connected in parallel; the conduction switch is configured to control a frequency at which the input DC terminal is connected to the inductor, and to maintain a current flowing through the inductor; and the conduction switch (Sf) The single-inductor multi-output DC conversion circuit operates in a pseudo-continuous conduction mode (PCCM) and a discontinuous conduction mode (DCM), that is, when the output load current is a heavy load, The single-inductor multi-output DC conversion circuit operates in a virtual continuous conduction mode (PCCM); and at light loads, the single-inductor multi-output DC conversion circuit operates in a discontinuous conduction mode (DCM). [0008] (2) a reference voltage switching switch (S) connected in series between the single inductance element η and a reference voltage for making the voltage of the input DC terminal to the inductor 099140461 Form No. Α0101 Page 7 / Total 35 pages 0992070452-0 201223096 Charging, for some applications, the reference voltage can be a ground voltage or a reference voltage higher than the ground voltage; [0009] [0011] [0012] (7) - output control module, connected to The single-inductance component and the reference voltage switch (Sn) are used for voltage-converting the DC voltage input to the DC terminal and outputting to the first-output DC terminal and the second output DC terminal; a first pulse width modulation device (PWM1), a charge pump (charg pump) and a second pulse width modulation device (PWM2); wherein: the first pulse width modulation device (cut, including a first switch (') and a second switch (S2) 'control the first switch (sp and the second switch (\) via the phase of the control circuit, and output the voltage of the DC terminal of the wheel to the first An output DC terminal; the charge fruit' Including a charge storage device, the charge storage device may be a single-electric valley or a plurality of capacitors connected to the first pulse width modulation device (PWM1), the second output DC terminal, and the second pulse width modulation Variable device (PWM2) 'When the charge_storage device is discharged, it is used to output a voltage to the second-round DC terminal; further, the charge can further include a diode, which is set in the electromagnetic radiation (10) between the device and the second output DC terminal for preventing current backlash. The second pulse width modulation device (PWM2) includes a third switch (&) and a fourth switch (S4) via The control circuit sends a signal phase control (four) third open_3) and the fourth switch (\); when the inductor (L) discharges the first output DC terminal, simultaneously charges the charge pump; When the conduction switch (Sf) is turned on, the output of the DC terminal of the wheel is output to the 099140461 form number AOlOi page 8 / total 35 page 0992070452-0 201223096 second output DC terminal. Again, the first pulse width modulation device ( PWM1) and the second pulse width modulation device (PWM2), which can be used by the gold oxide half field The transistor MSOFET is constructed. [0013] The single-inductor multi-output DC converter with charge pump control of the present invention uses a freewhee 1 charge-pump control technique (FCPC) to increase the output but not The operation cycle is extended to solve the waste of the prior art using the forward switching time. 根据 [Face] According to another object of the present invention, a single inductor multiple output DC converter with charge pump control is proposed, similar to the foregoing, However, there are two charge pumps, and for the second charge pump, a corresponding third pulse width modulation device (PWM3) is provided for controlling the other DC output terminal; similarly, a third charge can be added. The pump is provided with a corresponding fourth pulse width modulation device (PWM4) for controlling the increased DC output. [0015] According to still another object of the present invention, a single inductor multiple output DC converter with charge pump control is provided, comprising a single inductor multiple output DC conversion circuit and a control circuit, the single inductor multiple output DC conversion circuit The voltage (vIN) of an input DC terminal is controlled by pulse width modulation by the control circuit to be converted into voltages of the N output DC terminals (V^, V%, ... V^), where N is even and greater than Equal to 4, wherein the single-inductor multi-output DC conversion circuit comprises: (1) a single inductor component connected to the input DC terminal, comprising a conduction switch (Sf) and an inductor (L), the conduction switch (Sf) The inductor (L) is connected in parallel; its function is as described above; 099140461 Form No. A0101 Page 9 / Total 35 Page 0992070452-0 [0016] 201223096 [0017] [0019] [0020] 099140461 (2) a reference electrical switch (S.) connected in series between the single electrical reducer and the reference voltage for charging the inductor (L) with the voltage of the input DC terminal, for some applications On, the reference voltage can be grounded or The reference voltage of the grounded electric house; (3) a plurality of output control modules, usually Ν/2, respectively connected to the single inductance component and the reference voltage switching switch (s), wherein each wheel is controlled The dragon group uses (4) to input the money Xuan Nuo ^ to convert the power to the output DC terminal; the output relay module further includes a first pulse width modulation device (pwM1), a charge pump and a first a second pulse width modulation device (PWM2); wherein: the first pulse width modulation device (PWM1) includes - a first switch (s) and a - second switch (s2) 'phase control of a signal via the control circuit The first switch (V and the second switch (V, the voltage of the input DC terminal is output to the first output DC terminal (ν〇ι); the charge pump includes - charge storage transfer; the electric storage device can The single capacitor or the plurality of capacitors are connected to the pulse width modulation device (PWM1), the second transducer DC scale, and the second pulse width modulation device (rain 2), when the charge storage device When discharging, for outputting a voltage to the second output DC terminal (V; Further, the charge pump may further include a diode disposed between the charge storage device and the second output DC terminal for preventing current backlash; the second pulse width modulation device (PWM2) a third switch (s) and a fourth switch (V, the phase of the signal is sent via the control circuit: the third switch (S) and the fourth acknowledge switch CS4), when the inductor α When the first output DC terminal is charged, the far-charge system is charged when the form number face is 10th; when the music page/35 pages Λ009Λ7Λ>ΐε9 201223096 [0021] Ο [0022] [0023] Ο [0024] When the conduction switch (Sf) is turned on, the voltage of the input DC terminal is output to the second output DC terminal. Further, the first pulse width modulation device (PWM1) and the second pulse width modulation device (PWM2) may be composed of a gold oxide half field effect crystal MSOFET. According to still another object of the present invention, a single inductor multiple output DC converter with charge pump control is provided, similar to the foregoing, but each of the output control modules of the plurality of output control modules may have two charge pumps. Or two or more, for the second charge pump, there is a corresponding third pulse width modulation device (PWM3) for controlling the other DC output terminal; similarly, a third charge pump can be added. There is a corresponding fourth pulse width modulation device (PWM4) for controlling the increased DC output. According to the present invention, a single-inductor multiple-output DC converter with charge pump control according to the present invention may have one or more of the following advantages: (1) The present invention has a single-inductance multiple-output DC converter with charge pump control. The charge pump of the output control module can increase the DC output by the charge storage device during the pulse width modulation of the forward conduction switch, thereby solving the conventional single inductor multiple output DC converter. During the conduction switch, the circuit does not perform voltage conversion, which wastes time and power. (2) The single-inductor multi-output DC converter of the present invention can increase the DC output by the charge storage device during the pulse width modulation of the forward-conducting switch by the charge pump of the output control module. The single-inductance DC converter that solves the prior art is in the pseudo-continuous conduction mode (PCCM). 099140461 Form No. A0101 Page 11 / Total 35 Page 0992070452-0 201223096 'Conversion of electric materials increases ^ number will be Recorded as (4), and the operating cycle becomes longer, the output voltage will be light and obvious. [Embodiment] [0027] [0027] Please refer to FIG. 4 for the charge of the invention. A schematic diagram of the circuit topology of the inductor-multiple-wheel-out converter. As shown in the figure, the single-electrode-heavy-output DC converter with electric material control of the present invention is composed of a single-inductance multi-wheel DC-output conversion circuit and a control circuit 3, and the voltage of the input DC terminal 2 is passed. The control circuit 3 is controlled by pulse width modulation and converted into voltages of the output DC terminals of the two groups, which are the voltage of the a-output DC terminal 151 (V〇i) and the voltage of the second output DC terminal 152 (v02), respectively. The voltage (%) of the first output DC terminal 151 and the voltage of the second output DC terminal 152 (V〇2); via this conversion, the voltage (vin) of the DC terminal 2 can be lowered-boosted or boosted-liter The voltage is converted into a voltage of the first output DC terminal 151 (V〇l) and a voltage of the second output DC terminal 152 (V〇2). The single inductor multi-output DC conversion circuit 1 includes a single inductor component 13, and a reference The voltage switching switch (Sn) 12 and the output control module 11 are configured to convert the voltage (v, N) of the input DC terminal 2 into the voltage of the first output DC terminal 151 of the DC-DC (dc-DC) (V〇 1) and the voltage of the second output DC terminal 152 (V〇2): (1) The single inductor element 13' is connected to the input DC terminal 2, consisting of a conduction switch (Sf) and an inductor (L), the conduction switch (Sf) and the inductor (L) are connected in parallel, and the phase of the signal sent by the receiving control circuit 3 must be f The turn-on switch (sf) is turned on and off, and is controlled by the turn-on switch (sf). 099140461 Form No. A0101 Page 12 / Total 35 Page 0992070452-0 201223096 The frequency at which the input DC terminal 2 is connected to the inductor (L) And to maintain the current flowing through the inductor (L) so that the current flowing through the inductor (L) = zero to a constant current range; the single inductor multi-output by the conduction switch (^) The DC conversion circuit i operates in a virtual continuous conduction mode (PCCM) and a discontinuous conduction mode (DCM), that is, when the output load current is a heavy load, the single inductance multi-output DC conversion circuit operates in a virtual continuous conduction mode ( PCCM); and at light load, the single-inductor multi-output DC conversion circuit 1 operates in discontinuous conduction mode (DCM). 〇_(2) Reference voltage switching switch (V12, connected in series to the single inductance element 13 and the reference voltage丨;; used to make the input DC terminal .2 voltage pair The inductor (L) is charged; for some applications, the reference voltage can be a ground voltage or a reference voltage of two ground voltages; the reference voltage switch (s) 12 is pulse width modulation (pulse_frequency width m〇dula_ tion, PWM mode of operation 'The signal of the phase 0 n of the signal sent via the control circuit 3 is the control on/off switch (^) on and off. [0029] (3) - the output control module 11 is connected to the edge single inductance element and The reference voltage switching switch (Sri) is configured to voltage-convert the DC voltage (VIN) of the input DC terminal 2; the output control module 11 further includes a first pulse width modulation device (PWM1) 141, a charge The pump 17 and the second pulse width modulation device (PWM2) 142 output the control module 11; wherein the output control module 11 is also in an operation mode in which the pulse width is modulated, and the signal of the phase 0f and 0丨 is sent via the control circuit 3 as The first pulse width modulation device (PWM1) 141 and the second pulse width modulation device (PWM2) 142 are separately controlled. [0030] The first pulse width modulation device (PWM1) 141 is composed of a first switch (S1) and a second switch (S2), and the signal phase 099140461 is sent via the control circuit 3. Form No. A0101 Page 13 / Total 35 pages 0992070452-0 201223096

A switch (S 2) is turned on and off, and the voltage of the early inductor element 13 is output to the first output terminal 151 with a capacitance (: 丨 and the load capacitance is V〇i ' below the second output DC terminal 152, etc.

The storage device (cx) may be composed of a single electric charge storage device (cx), a charge storage capacitor or a plurality of capacitors connected to the first pulse width modulation device (10) 1) 141 and the second output DC terminal 152. And the second pulse width modulation device (pwM2) 142, when the charge storage device (cx) is discharged, for discharging the voltage (V〇2) to the second output DC terminal 152; further, the charge pump 17 may further include a diode' disposed between the charge storage surface (v and the second round DC terminal 152 for preventing current backlash. [0032] the second pulse width modulation device ( a pWM2) 142, comprising a third switch (Sg) and a fourth switch (sp), the third switch (&) and the fourth switch (^) are controlled by the phase of the signal sent by the control circuit 3; When the inductor (L) discharges the first output DC terminal 151, the charge pump 17 is simultaneously charged; when the conduction switch (Sf) is turned on, the voltage of the input DC terminal 2 is output to the DC inductor 13 The voltage of the second output DC terminal 152 (V〇2). In addition, the first pulse width modulation device (P The WM1) 141 and the second pulse width modulation device (pWM2) 142 may be formed by a metal oxide half field effect transistor MSOFET or other semiconductor components, and are not limited thereto. The circuit diagram of FIG. 4 is only the circuit extension of the embodiment.朴图' The actual circuit configuration is not limited to the combination of the illustrated electronic components. 099140461 Form No. AOiOi Page 14/35 pages 0992070452-0 201223096 [0033] Ο [0034] ❹ Refer to Figure 5, Figure 5 For the relationship between the pulse width modulation time section and the output current of the embodiment, the control circuit 3 sends a signal of 0, 0, and 0 f phase within a cycle time 1\, and controls the reference voltage switching switch 12, A pulse width modulation device (PWM1) 141, a second pulse width modulation device (PWM2) 142 and a switch corresponding to the single inductance element 13 convert the voltage (VIN) of the input DC terminal 2 into DC-DC (DC- The voltage (Vy) of the first output DC terminal 151 of DC) and the voltage (VQ2) of the second output DC terminal 152; in Figure 5, the current Ii/output current through the inductor (L) can be maintained. The higher DC current L is known from the technology. For example, the single-inductor multi-output dc-to-DC converter with charge pump control uses a freewheel charge-pump control technique (FCPC) to increase the output without lengthening the operation cycle. The prior art uses the pass-through switching time and power waste. For different applications, as in this embodiment, the output control module 11 includes a first pulse width modulation device (P1M1) 141 and a second pulse bandwidth modulation device. In addition to (PWM2) 142, two or more sets of charge pumps 17 are further included, and for the second charge pump 17, a corresponding third pulse width modulation means (PWM3) is provided for controlling the third direct current. The output voltage of the output terminal; similarly, a third charge pump can be added, and a corresponding fourth pulse width modulation device (PWM4) is provided for controlling the voltage of the fourth DC output terminal; thereby further saving Follow the switch time. Please refer to FIG. 6 for a circuit topology diagram of a second embodiment of a single-inductor multiple output DC converter with charge pump control according to the present invention. As shown in the figure, compared with the first embodiment, it is the same as the first output control mode in the single-inductor multi-output DC conversion circuit 1 099140461 Form No. A0101, page 15 / 35 pages 0992070452-0 [0035] 201223096 The group ιη adds a second round-out control mode and 11 2 converts the voltage of the input DC terminal 2 (V 〖N) into a DC-DC (DC-DC) first output DC terminal 151 by the first output control module 111. The voltage (V〇i) and the voltage of the second output DC terminal 152 (v〇2), the second output control module 11 2 converts the voltage (VIN) of the input DC terminal 2 into DC_DC (DC-DC) The voltage (v) of the third output DC terminal U3 and the voltage (V) of the fourth output DC terminal 154. [0038] [0038] In this embodiment, a single-inductor multiple-output DC converter with charge pump control includes a single-inductor multi-output DC conversion circuit and a control circuit 3 The circuit 1 converts the voltage (VIN) of one round of the DC terminal 2 through the control circuit 3 to send signals of 0n, 0丨, 02, ..., and 0 phase, and is controlled by pulse width modulation, and the output is converted into N outputs. The voltage at the DC terminal (V〇i, V〇2, ...V〇N), where N is an even number and greater than or equal to 4, and only the N=4 single-inductor multiple-output DC converter circuit topology is shown in FIG. Figure. The following is only a description of N = 4, but not limited to this. The single-inductor multi-output DC conversion circuit 1 comprises: - -: ; · .'4... :. :' (〇 single inductance element 13, connected to the peak of the DC terminal 2, including a conduction switch (Sf) And an inductor (1), the conduction switch (Sf) and the inductor (L) are connected in parallel; the function is as described in the first embodiment, and will not be described herein. (2) Reference voltage switching switch ( Sj12 is connected in series between the single inductor element 13 and a reference voltage for charging the inductor (L) by the voltage (Vin) of the input DC terminal 2. For some applications, the reference voltage may be a ground voltage. Or a reference voltage higher than the ground voltage. 099140461 Form No. A0101 Page 16 / Total 35 Page 0992070452-0 201223096 [0039] Ο ❹ [0040] (3) A plurality of output control modules can usually be Ν/2, in In the sixth embodiment of the present invention, two wheel-out control modules are shown, which are the first module m and the second wheel-out control module 112, and the plurality of output control modules are respectively connected to four single inductors; The device 13 and the reference (four) switch (S) 12' each of which is used to control the direct current of the DC terminal 2 Voltage (VIN) is voltage-converted and output to two output DCs, the first output DC terminal and the second output DC terminal; the each output control module further includes a first pulse width modulation device (PWM1) a charge pump and a second pulse width modulation device (PWM2), as shown in FIG. 6, the first output control module U1 controls the output voltage (v01) of the first output DC terminal 151 and the second output DC The output voltage of the terminal 152 (v); each of the output control modules further includes two pulse width modulation devices (a first pulse width modulation device (PWM1) and a second pulse width modulation device (PWM2)) a charge pump; as shown in FIG. 6, the first output control module ill includes a first pulse width modulation device (PWM1) 141, a second pulse width modulation device (PWM2) 142, and a first power pump 171. The second output control module 112 also includes a match-pulse width modulation device (the first pulse width modulation device is labeled as the third pulse width modulation device (PWM3) 143 for convenience of explanation) and the second pulse. Width modulation device (here for convenience, The second pulse width modulation device is labeled as a fourth pulse width modulation device (PWM4) 144) and a third charge pump 173. The first pulse width modulation device (PWM1) 141 includes a first switch (1) and a second switch (S2), the phase switch is controlled by the control circuit 3 to control the first switch (sp and the second switch (S2), and the voltage (VIN) of the input DC terminal 2 is output to the first output DC terminal 151 input 099140461 Form number A0101 Page 17 / Total 35 page 0992070452-0

201223096 Output voltage (V

OK

[0043] The first charge pump 171 includes a charge storage device ((χ), the charge storage device may be a single capacitor or a plurality of capacitors, connected to the first pulse width modulation The device (PWM1) 141, the second output DC terminal and the second pulse width modulation device (PWM2) 142 are configured to output a voltage to the second output DC terminal 152 when the charge storage device (c) is discharged ( 027. Further, the first charge pump may further include a diode disposed between the charge storage device (cx) and the second output DC terminal 152 to prevent current backlash. The width modulation device (PWM2) i42 includes a third switch (S3) and a fourth switch (sp' is sent out via the control circuit 3. The signal is controlled to control the third switch (S3) and the fourth switch. (54); when the s-shaped inductor (L) discharges the first output DC terminal 151, simultaneously charging the first charge pump 171; when the conduction switch (sf) 12 is turned on, the input DC terminal 2 The voltage is output to the second round of the output DC terminal 丨 52. Again, the first pulse The degree modulation device and the second pulse width modulation device (PWM2) 142 may be composed of an oxygen partial half-effect transistor ^^'. The second output control module 112 includes a third pulse width modulation device ( PWM3) 143, fourth pulse width modulation device (PWM4) 144 and a third charge pump 173. The third pulse width modulation device (PWM3) 143 includes a fifth switch (S 5) and a sixth switch ( S δ), the signal outputting the phase φ 2 via the control circuit 3 controls the fifth switch (s5) and the sixth switch (s6), and outputs the voltage (VIN) of the input DC terminal 2 to the third output DC Output voltage of terminal 153 (VQ3) 099140461 Form number AOiOl Page 18 of 35 0992070452-0 201223096 [0044] [0046] [0046]

G

[0047] 099140461 The third charge pump 173' includes a charge storage device (~) connected to the third pulse width modulation device (PWM3) 143, the fourth output DC terminal and the fourth pulse width modulation device ( PWM4) 144, when the charge storage device (Cy) is discharged, is used to output a voltage (V〇4) to the fourth output DC terminal. The fourth pulse width modulation device (PWM4) 144' includes a seventh switch (s?) and an eighth switch (S8). The control circuit 3 sends a signal with a phase of 0f2 to control the seventh switch. And the eighth switch (s); 2 when the inductor (L) discharges the third output DC terminal ί53, simultaneously charging the third charge pump 173; when the conduction switch (5丨) 12 is turned on The voltage of the input DC terminal 2 is output to the fourth output DC terminal ι54. (4) Ν/2 voltage dividers, in this embodiment, two voltage dividers, respectively a first voltage divider 161 and a third voltage divider 163, the first voltage divider 161 is used to output the first output The output voltage (ν〇ι) of the DC terminal 151 is divided and outputted to the control circuit 3, and the third voltage divider 163 is used to divide and output the output voltage (V〇3) of the third output DC terminal 153. The voltage is then fed back to the control circuit 3; the control circuit 3 can calculate the U u according to the output voltage (V〇1) of the first output DC terminal 151 and the output voltage (Vn<J) of the third output DC terminal 153. . Please refer to FIGS. 7 and 8. FIG. 7 is a phase diagram of the switching control signal and output current of the single-inductor multiple-output DC converter with charge pump control according to the embodiment, and FIG. 8 is a pulse width modulation time zone. Schematic diagram of the relationship between the segment and the output current; in Fig. 7, in the period T, in the phase I, the control circuit 3 outputs a high potential of the signal phase of 4 n to turn on the reference voltage switching switch (S); Circuit 3 output signal phase is (^ηηη Form number Α0101 Page 19/35 pages 0992070452-0 201223096 Low potential can turn the reference voltage switch (sn) non-conducting, output signal phase is 0 ̄ high potential can be A switch (sp, the second switch (s2) and the fourth switch (S4) are turned on [0048] [0049] In the positive and further 111, the control circuit 3 outputs a signal phase with a high potential of ' " η, a single inductor element The control switch (Sf) and the third switch (sp' control the first output control module 11 2, in the second half of the cycle, in the phase IV, the control circuit 3 outputs the signal phase to the high potential Reference voltage switch (sn) In phase V, the control circuit 3 outputs a signal phase of $. The low potential can switch the reference voltage (SJ is non-conducting, the phase of the signal is 2 must be high, and the fifth switch (Ss), sixth The switch (36) is turned on with the eighth switch (sp. Then, in phase VI, the control circuit 3 outputs a signal whose phase is 0 f, and the conduction switch (Sf) and the seventh switch (S?) are turned on; thus completing one The period control causes the voltage (Vin) of the input DC terminal 2 to be output to the first output DC terminal 151, the second output DC terminal 152, the third output DC terminal 153, and the fourth output DC terminal 154. Please refer to the case, in a In the cycle \, the current through the inductor (L) ~ (round current) can maintain a higher DC current I than the prior art. The operation sequence of each switch of the dc single-inductor multi-output DC conversion circuit 1 is ninth. In the period Ts, in the phase I, the control circuit 3 outputs a high potential of the signal phase of 0n to switch the reference voltage switch (Sj is turned on, at this time, the input DC terminal 2 is connected to the inductor of the single inductance element 13 (L) Charging. In stage Ιί, control circuit 3 loses The low phase of the signal phase is 0. The voltage switch (sn) is not turned on, and the output signal phase is 0 高. The first switch (S丨), the second switch (S) and the fourth switch (s) ) Conduction, 4 099140461 Form No. A0101 苐 20 pages / Total 35 pages 0992070452-0 201223096 At this time, the inductor (1) is discharged, generating a boost at the output-output DC terminal i5i output ^m(vqi), and at the same time for the charge storage device (y charging. In phase III, the control circuit 3 rotates the signal phase to a high potential, and the single-inductor is turned on (the ν and the third switch (s) are turned on' at this time because of the third switch (S3) is turned on, and the lower plate of the charge storage device (3cx) is G (G is the ground voltage, and for different applications, the voltage is V), so the upper plate voltage is from vv οι VIN ten produces a boost output to the voltage of the second output DC terminal 152. In the phase Ιν, the control circuit 3 outputs a signal phase with a high potential of ^, which can cut the reference power.

The switch (sn) is turned on. At this time, the input DC terminal 2 charges the inductor (L) of the single inductance element 13. In phase V, the control circuit 3 outputs a signal phase with a low potential of $ 可 to switch the reference voltage „(,) non-conducting, the output signal η phase is 2 high potential, the fifth switch (^), the sixth switch (^) is turned on with the eighth switch (Ss), discharging the energy of the inductor (L) to the voltage (v03) of the third output DC terminal 153 and the charge storage device (cY). Then in the phase VI, the control circuit 3 The high level of the output signal phase is 0 (, 0) 2, the forward switch (sf) and the seventh switch (s7) are turned on, and the seventh switch (S7) is turned on to turn off the lower plate of the charge storage device (CY). The voltage is boosted from 〇 (〇 is the ground voltage, which is the reference voltage for different applications), and the upper plate voltage is boosted from V03 to VIN + V03 ' produces a boosted output voltage of the fourth output DC terminal 154 (V 〇4). Repeating the above six stages, the single-inductor multi-output DC conversion circuit 1 can generate four sets of output voltages. Thus, the single-inductor multiple-output DC converter of the present embodiment uses the forward-pass charge pump control technique. (freewheel charge-pump control technique, FCPC), in virtual Continuous conduction mode (PCCM) and discontinuous conduction mode (DCM) are voltage-changed with complex phase control (time-multiplexing 099140461 Form No. A0101 Page 21/35 pages 0992070452-0 201223096 control). Lifting and carrying current capability' and increasing the number of outputs and reducing energy solve the waste of the prior art using the forward-switching switching time. In this example, if you want to increase the output of the output DC terminal, you can use the first output. The control module (1) is provided with two or more charge pumps, such as adding a second charge pump Π 2 (not shown), and is provided with a corresponding fifth pulse width modulation device (5). To control the fifth output DC terminal (not shown in the figure); the same reason can be added to the second output control module U2 to add a fourth charge fruit m (not shown in the figure), and has a corresponding A six-pulse width scenting device (PWM6) for controlling the sixth output DC terminal (not shown on the upper edge of the figure) [0050] [0051] Please refer to the 1G®, the _ is a charge (four) system of the present invention Single inductor multiple output DC converter of the third embodiment The schematic diagram of the road topology is similar to that of the second embodiment, and will not be described here. However, the voltage divider of the single-inductor multi-output DC conversion circuit 1 is as follows: (4) N voltage dividers, This embodiment is a 4_ voltage divider, which is a first voltage divider 161, a second voltage divider 162', a third voltage divider 163 and a fourth voltage divider 164; the first voltage divider 16 is used to The output voltage (ν〇ι) of the first output DC terminal 151 is divided and outputted to the control circuit 3, and the second voltage divider 162 is used to output the output voltage of the second output DC terminal 152 (V〇2). The voltage divider output voltage is fed back to the control circuit 3; the third voltage divider 163 is used to divide the output voltage (v〇3) of the third output DC terminal 丨53 and output the voltage to the control circuit 3; The fourth voltage divider 164 is used to output the output voltage of the fourth output DC terminal 154 (V. The voltage is output to the control circuit 3; the control circuit 3 can be rotated according to the first output DC terminal 151. 099140461 Form No. A0101 Page 22/35 pages 099207045^-0 201223096 Voltage (V^) The output voltage (V%) of the second output DC terminal 152, the output voltage (V%) of the third output DC terminal 153, and the output voltage (Vn/t) of the fourth output DC terminal 154 are controlled. 04 [0053] 005

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a single inductor multiple output voltage conversion circuit of the prior art, and FIG. 2 is a schematic diagram of another prior art single inductor multiple output voltage conversion circuit; FIG. 3 is a second diagram The phase diagram of the switch control signal and the output current; FIG. 4 is a schematic diagram of the circuit of the first embodiment of the single-inductor multi-output DC converter with charge pump control of the present invention; FIG. 5 is a diagram of the present invention A schematic diagram of the relationship between the pulse width modulation time section and the output current of the single-inductance multiple-output DC converter of the charge pump control; FIG. 6 is a single-inductor multiple-output DC converter with charge pump control according to the present invention. The schematic diagram of the circuit topology of the second embodiment; FIG. 7 is a phase diagram of the switching control signal and the output current of the second embodiment of the single-inductor multiple-output DC converter with charge pump control of the present invention. FIG. 8 is a diagram Schematic diagram of the relationship between the pulse width modulation time section and the output current of the second embodiment of the single-inductor multiple output DC converter with charge pump control of the present invention Fig. 999140461 Form No. A0101 Page 23/35 Page 0992070452-0 201223096 Fig. 9 is a phase of the pulse width modulation switch of the second embodiment of the present invention with a charge pump controlled single inductor multiple output DC converter A schematic diagram of the control process illustrated by the circuit; and FIG. 10 is a schematic diagram of the circuit of the third embodiment of the single-inductor multi-output DC converter with charge pump control of the present invention. [Main component symbol description] [0054] 1: Single-inductor multi-output DC conversion circuit; 2: Input DC terminal; 3: Control circuit; 10: Single-inductor multiple-output voltage conversion circuit; 11: Output control module 111: a first output control module; 112: a second output control module; 12: a reference voltage switch; 13: a single inductor element; 141: a first pulse width modulation device; 142: a second pulse width modulation device; : third pulse width modulation device; 144: fourth pulse width modulation device: 1 51 : first output DC terminal; 1 5 2 : second output DC terminal; 1 5 3 : third output DC terminal; Fourth output DC terminal; 161: first voltage divider; 162: second voltage divider; 099140461 163: third voltage divider; form number A0101 page 24/total 35 page 0992070452-0 201223096 164: fourth point Pressure vessel; 1 7 : charge pump; 171: first charge pump; and 173: third charge pump. 〇 099140461 Form No. A0101 Page 25 of 35 0992070452-0

Claims (1)

201223096 VII. Patent application scope: 1. A single-inductor multi-output DC converter with charge pump control, comprising a single-inductor multi-output DC conversion circuit and a control circuit, the single-inductance multi-output DC conversion circuit is an input The voltage of the DC terminal is controlled by pulse width modulation by the control circuit to be converted into a voltage of a first output DC terminal and a voltage of a first-to-second output DC terminal; wherein the single-inductance multi-output DC conversion circuit comprises: An inductive component, coupled to the input DC terminal, includes a turn-on switch and an inductor, the turn-on switch and the inductor are connected in parallel; the turn-on switch is configured to control a frequency at which the input DC terminal is connected to the inductor, and To maintain a current flowing through the inductor β, a reference voltage switching switch is connected in series between the single inductor component and the reference voltage for charging the inductor with the voltage of the input DC terminal; an output control module Connected to the single inductor component and the reference voltage switch to input the DC voltage of the input DC terminal The voltage conversion is output to the first output DC terminal and the second output DC terminal; the output control module further includes a first pulse width modulation attack, a charge pump and a second pulse width modulation device, wherein The first pulse width modulation device includes a first switch and a second switch, and the phase of the signal is sent through the control circuit to control the first switch and the second switch, and the voltage of the input DC terminal is output to the The first output DC terminal of the charge pump includes a charge storage device coupled to the first pulse width modulation device, the second output DC terminal and the second pulse width modulation device, when the charge storage device is discharged For outputting the second output DC terminal 099140461 form Α0101 page 26/35 page 0992070452-0 201223096; the second pulse width modulation device includes a third switch and a fourth switch The phase of the signal sent by the control circuit controls the third switch and the fourth switch; when the inductor discharges the first output DC terminal, simultaneously If charge charging when the switch is turned on is turned on * The DC output terminal of the input voltage to the second DC output terminal. 2. The single-inductor multi-output DC converter with charge pump control according to claim 1, wherein the reference voltage switching switch is connected in series between the single inductor element and ground. 3. The single-inductor multiple-output DC converter with charge pump control according to claim 1, wherein the charge pump further comprises a diode disposed on the charge storage device and the second output DC terminal. Between, to prevent the current backlash of the second output DC terminal. 4. The single-inductor multi-output DC converter with charge pump control according to claim 1, wherein the charge pump is two or more and has a pulse width modulation corresponding to the charge pump. Device. 5. The single-inductor multi-output DC converter with charge pump control according to claim 1, wherein the charge storage device of the charge pump is a capacitor. 6. The single-inductor multiple-output DC converter with charge pump control according to claim 1, wherein the first pulse width modulation device and the second pulse width modulation device are one or more The gold oxide half field effect transistor is composed. 7. A single-inductor multiple-output DC converter with charge pump control, comprising a single-inductor multi-output DC conversion circuit and a control circuit, wherein the single-inductor multi-output DC conversion circuit passes a voltage of an input DC terminal Control electric 099140461 Form No. A0101 Page 27 / Total 35 page 0992070452-0 201223096 The road is controlled by pulse width modulation to convert to the voltage of N output DC terminals, where N is even and greater than or equal to 4, where the single inductance is more The output DC conversion circuit comprises: a single inductance component connected to the input DC terminal, comprising a conduction switch and an inductor, the conduction switch and the inductor being connected in parallel; the conduction switch is used for controlling the DC input end of the wheel a frequency connected to the inductor and used to maintain a current flowing through the inductor; a reference voltage switching switch connected in series between the single inductor component and a reference voltage for causing the voltage of the input DC terminal to the inductor Charging; a plurality of output control modules connected to the single inductive component and the reference voltage switch, each of which The output control module is configured to perform voltage conversion on the DC voltage of the input DC terminal and output the output to the two output DC terminals, where the two output DC terminals are a first output DC terminal and a second output DC terminal; The output control module further includes a first pulse width modulation device, a charge pump and a second pulse width modulation device, wherein: the first pulse width modulation device comprises a first switch and a second switch, The first switch and the second switch are controlled by the phase of the signal sent by the control circuit, and the voltage of the input DC terminal is output to the first output DC terminal, and the charge pump includes a charge storage device connected to the first a pulse width modulation device, the second output DC terminal and the second pulse width modulation device, when the charge storage device is discharged, for outputting a voltage to the second output DC terminal; the second pulse width modulation device a third switch and a fourth switch, the phase of the signal is sent via the control circuit to control the third switch and the fourth switch; when the inductor pair When the first output DC terminal is discharged, the charge is charged to 099140461 Form No. A0101, page 28/35 pages 0992070452-0 201223096, and the voltage of the input DC terminal is output to the second output when the conduction switch is turned on. DC terminal. 8. The single-inductor multi-output DC converter with charge pump control according to claim 7, wherein the reference voltage switching switch is connected in series between the single inductor element and ground. 9. The single-inductor multiple-output DC converter with charge pump control according to claim 7, wherein the charge pump further comprises a diode disposed on the charge storage device and the corresponding output DC terminal. In order to prevent the current backlash of the output DC terminal. 10. The single-inductor multiple-output DC converter with charge pump control according to claim 7, wherein the charge pump is two or more and has a pulse width modulation corresponding to the charge pump. Device. 11. The single-inductor multiple-output DC converter with charge pump control according to claim 7, wherein the single-inductor multiple-output DC converter further comprises N/2 voltage dividers, the voltage divider being connected to The corresponding output DC terminal is used for shunting the output voltage of the corresponding output DC terminal and feeding it back to the control circuit. 12. The single-inductor multi-output DC converter with charge pump control according to claim 7, wherein the single-inductor multiple-output DC converter further comprises N voltage dividers, each of which is connected to each The output DC terminal is configured to return the corresponding output DC end shunt output voltage to the control circuit 〇13. The single-inductor multi-output DC converter with charge pump control according to claim 7 of the patent scope, wherein the electric charge The charge storage device of the pump is composed of a capacitor. 14. Single-inductor multiple 099140461 with charge pump control as described in claim 7 of the scope of the patent application. Form No. A0101 Page 29/35 pages 0992070452-0 201223096 Output DC converter, wherein the first pulse width modulation device The second pulse width modulation device is composed of one or a plurality of gold oxide half field effect transistors. 099140461 Form Number ΑϋΙΟΙ Page 30 of 35 0992070452-0