CN204103764U - A kind of Switching Power Supply supporting multi-mode to switch - Google Patents
A kind of Switching Power Supply supporting multi-mode to switch Download PDFInfo
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- CN204103764U CN204103764U CN201420595505.2U CN201420595505U CN204103764U CN 204103764 U CN204103764 U CN 204103764U CN 201420595505 U CN201420595505 U CN 201420595505U CN 204103764 U CN204103764 U CN 204103764U
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Abstract
The utility model discloses a kind of Switching Power Supply supporting multi-mode to switch, comprise switching tube, control module and voltage conversion circuit; Described Switching Power Supply is provided with mode selection pin, receives the mode select signal of outside input to control module transmission; Described control module limits the type of the modulation signal that it exports according to mode select signal, transfers to described switching tube, limits the mode of operation of Switching Power Supply.The mode of the utility model employing increase external input voltage is carried out control switch power supply under its multiple-working mode supported, is carried out selection switching, and after selected mode of operation, load current how to change all force switch power work under this kind of pattern, not only increase the versatility of Switching Power Supply thus, under making a way switch power supply that various modes can be operated in; And for some certain applications, can guarantee that the mode of operation of Switching Power Supply can not change along with load current, meet the application-specific demand of some occasions.
Description
Technical field
The utility model belongs to switch power technology field, specifically, relates to a kind of design on control circuit carrying out selecting to switch for control switch power supply in multiple-working mode.
Background technology
Switching Power Supply utilizes modern power electronics technology, by the time ratio that control switch pipe turns on and off, a kind of power supply of the voltages keep constant that it is exported, is partly made up of the control module of switch mosfet pipe and controls MOSFET break-make and voltage conversion circuit etc. usually.
Current Switching Power Supply, can be divided into voltage/current control mode, sluggish control mode, constant on-time control mode etc. according to the difference of control mode.Wherein, voltage/current control mode needs internal clocking, based on the difference of modulating mode, pulse-width-modulated mode (Pulse Width Modulation can be operated in, PWM) under, pulse frequency modulated pattern (Pulse Frequency Modulation, PFM) under or under hop cycle modulating mode (Pulse Skip Modulation, PSM).In a PWM mode, the switching frequency that control module exports is fixed, and carrys out regulated output voltage by adjustment pulse duration.And under PFM pattern or PSM pattern, control module meets the change of load current by changing switching frequency.Because PWM mode can keep constant switching frequency, therefore in transient response speed and noise, there is good performance, be especially applicable to being applied in heavily loaded occasion.And these two kinds of patterns of PFM and PSM are owing to can reduce switching frequency with the reduction of load current, therefore can reduce switching loss, improve the conversion efficiency of system, be particluarly suitable for applying in the larger occasion of load current excursion.
Existing Switching Power Supply, in the design process often by its based on modulating mode be fixed up, that is, under a Switching Power Supply can only be operated in a kind of modulating mode, regulate its pulse duration (for PWM mode) or switching frequency (for PFM pattern) by the value of feedback receiving load current, and then realize the stable of its output voltage.This design causes technical staff to need to select suitable Switching Power Supply to carry out the specific design of circuit system, poor universality according to the actual loading situation of application scenario in advance, adds the workload of technical staff.Even if some Switching Power Supply according to its mode of operation of curent change adaptively modifying of load, but can need the application scenario of force switch power work under a certain AD HOC for some, this Switching Power Supply still cannot meet application demand.
Summary of the invention
The purpose of this utility model is to provide a kind of Switching Power Supply supporting multi-mode to switch, and can change the mode of operation of Switching Power Supply by the control of external signal, and force switch power work is under selected mode of operation.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
Support the Switching Power Supply that multi-mode switches, comprise switching tube, for the control module that controls described switching tube break-make and the voltage conversion circuit be communicated with described switching tube; Described Switching Power Supply is provided with mode selection pin, receives the mode select signal of outside input, and to control module transmission; Described control module limits the type of the modulation signal that it exports according to described mode select signal, transfers to described switching tube, after limiting the mode of operation of Switching Power Supply, through the voltage needed for voltage conversion circuit output loading.
In order to reduce the pin number of Switching Power Supply as much as possible, described mode select signal is a road analog signal, and the mode of operation of described Switching Power Supply support is N kind, described N be greater than 1 integer; Mode selection circuit is provided with in Switching Power Supply, mode select signal described in described mode selection circuit receives, and be processed into the mode enable signal of N railway digital amount, transfer to described control module, limit the type of the modulation signal that described control module exports, control switch power work is under selected mode of operation.
Further, N-1 road comparator and N railway digital logical circuit is provided with in described mode selection circuit, described mode select signal transfers to N-1 road comparator correspondingly and compares with the N-1 road threshold voltage preset, and exports N-1 way switch amount signal; The difference of the modulation signal type corresponding to the different magnitudes of voltage of the mode select signal preset, determine the logic corresponding relation between N road mode enable signal and described N-1 way switch amount signal, and then build N railway digital logical circuit according to described logic corresponding relation, the N road mode enable signal needed for generation.
Preferably, described Switching Power Supply supports three kinds of mode of operations, is respectively pulse-width-modulated mode, pulse frequency modulated pattern and ultrasound mode; The ultrasound mode enable signal that described mode selection circuit conversion exports transfers to a ultrasonic gauge, the timing time of described ultrasonic gauge is less than 50 microseconds, export sprocket pulse to described control module, limit the frequency of the pulse frequency modulated signal that described control module exports under ultrasound works pattern at more than 20KHz.
Further, described comparator is provided with two-way, and the in-phase input end of first via comparator receives first threshold voltage, and the mode select signal described in inverting input receives, exports the first on-off model; The in-phase input end of the second road comparator receives Second Threshold voltage, the mode select signal described in inverting input receives, and exports second switch amount signal; Wherein, first threshold voltage is greater than Second Threshold voltage.
Further again, as the concrete teaming method of described Digital Logical Circuits, the utility model proposes following two kinds of decision design modes:
The first, described Digital Logical Circuits is provided with three tunnels: in first via Digital Logical Circuits, be provided with a NAND gate and two not gates, after described second switch amount signal carries out negate computing by one of them not gate, export to after NAND gate carries out NAND operation with described first on-off model, export another one not gate to and carry out negate computing, and then output pulse width modulating mode enable signal; A NAND gate and three not gates are provided with in the second railway digital logical circuit, after described first on-off model and second switch amount signal carry out negate computing via a not gate separately, transfer to NAND gate respectively and carry out NAND operation, then export to after the 3rd not gate carry out negate computing, output pulse frequency modulating mode enable signal; A NAND gate and a not gate is provided with in the 3rd railway digital logical circuit, after described NAND gate carries out NAND operation to the first described on-off model and second switch amount signal, export not gate to and carry out negate computing, and then export ultrasound mode enable signal.
It two is, described Digital Logical Circuits is provided with three tunnels: in first via Digital Logical Circuits, be provided with one and door and a not gate, after described second switch amount signal carries out negate computing by not gate, export to and carry out and computing with described first on-off model with door, and then output pulse width modulating mode enable signal; One and door and two not gates are provided with in the second railway digital logical circuit, after described first on-off model and second switch amount signal carry out negate computing via a not gate separately, transfer to respectively and carry out and computing with door, and then output pulse frequency modulating mode enable signal; In the 3rd railway digital logical circuit, be provided with one and door, described with door to the first described on-off model and second switch amount signal carry out with computing after, export ultrasound mode enable signal.
In order to avoid line fault or overload cause Switching Power Supply to be damaged; the utility model is also connected with load current sample circuit at the output of described Switching Power Supply; described load current sample circuit converts load current to load voltage and feeds back to Switching Power Supply; if load voltage exceedes the higher limit preset; the then mode enable signal of shielding described in N road; make control module stop exporting modulation signal, enter guard mode.
In order to when load voltage transfinites; the shielding to N road mode enable signal can be realized; described load voltage is fed back to another road comparator in Switching Power Supply; the load voltage received and the higher limit preset compare by another road comparator described; output protection signal and N road mode enable signal respectively via N road and door carry out respectively with computing after, transfer to described control module.
Compared with prior art, advantage of the present utility model and good effect are: the mode of the utility model employing increase external input voltage is carried out control switch power supply under its multiple-working mode supported, carried out selection switching, and after selected mode of operation, load current how to change all force switch power work under this kind of pattern.Thus, not only increase the versatility of Switching Power Supply, under making a way switch power supply to be operated in various modes, meet the different designs requirement of different system; And for some certain applications, can guarantee that the mode of operation of Switching Power Supply can not change along with the change of load current, thus meet the application-specific demand of some occasions, expand the suitable application area of Switching Power Supply.
After reading the detailed description of the utility model execution mode by reference to the accompanying drawings, other features of the present utility model and advantage will become clearly.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the multi-mode switching part of a kind of embodiment of the Switching Power Supply that the utility model proposes;
Fig. 2 is the partial circuit schematic diagram of a kind of embodiment of mode selection circuit in Fig. 1;
Fig. 3 is another part circuit theory diagrams of a kind of embodiment of mode selection circuit in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
In order to make Switching Power Supply in its multiple-working mode supported, can according to the actual demand switch operating of user under required pattern, then the electricity consumption requirement of different system is met, the present embodiment carries out improvement design to existing Switching Power Supply, Switching Power Supply sets up mode selection pin, receive the outside mode select signal provided, system judges the mode of operation needed for user by the mode select signal of input, and then the work of control switch electrical source exchange in this mode.Once model selection completes, no matter how load current changes, and Switching Power Supply works in this pattern all the time, and the multi-mode thus achieving Switching Power Supply switches.
For the practical situations that Switching Power Supply is current, the present embodiment mainly considers following three kinds of mode of operations:
1, PWM mode: in some applications, requires that the switching frequency of maintained switch power supply is constant, and not with load current change, this just needs to provide a kind of forces PWM mode.In this mode, the switching frequency of switching tube does not change with the change of load current, and advantage holding frequency to be constant, improves load transient response speed, reduces audio-frequency noise, is applicable to being applied in heavily loaded system.
2, PFM pattern: the great advantage of PFM pattern is that the switching frequency of switching tube changes with the change of load current in full-load range, switching frequency can infinitely reduce in theory, can its conduction loss and switching loss be down to minimum under underloading condition, and then reach conversion efficiency the highest in full-load range.Therefore, in the application that load current excursion is larger, preferred PFM pattern carries out work.
3, ultrasonic (Ultra Sonic, US) pattern: due under PFM pattern, the switching frequency of switching tube can reduce along with the reduction of load current always, when the very little even zero load of load current, switching frequency may drop to below 20KHz always.Because the audibility range of people's ear is between 20Hz-20KHz, therefore when the switching frequency of switching tube is lower than 20KHz, the noise of switch or inductive current can enter the audibility range of people's ear, namely produces audio-frequency noise.In order to avoid audio-frequency noise, the present embodiment devises ultrasound mode, i.e. US pattern, and the operation principle of this pattern is: the lowermost switch frequency of limit switch pipe is H, described H>20KHz; The switching frequency of by-pass cock pipe changes with the change of load current, is namely similar to PFM mode of operation, when switching frequency drops to H, maintains switching frequency and equals H, namely ensure that switching frequency is in more than 20KHz all the time, thus avoid the generation of audio-frequency noise.The difference of ultrasound mode and PFM pattern is: in the design of Switching Power Supply, add a ultrasonic gauge, the lowermost switch frequency of the sprocket pulse limit switch pipe utilizing ultrasonic gauge to produce, makes the switching frequency of switching tube maintain more than 20KHz all the time.Because ultrasound mode has above-mentioned operating characteristic, be therefore applicable to being applied in underloading or occurring in unloaded application scenario sometimes, while guarantee light-load efficiency, the generation of audio-frequency noise can be avoided.
Below for above-mentioned three kinds of mode of operations, the specific design mode of Switching Power Supply is set forth in detail.
First the present embodiment sets up signal is selected at least one road mode selection pin for receiving mode in Switching Power Supply, for the consideration reducing Switching Power Supply pin number as far as possible, described mode select signal is preferably set to a road analog signal, a such as road voltage signal, Switching Power Supply is set up the mode selection pin of a road analog quantity, the outside described voltage signal provided is provided, then judges according to the magnitude of voltage of this voltage signal the mode of operation that user selects.Inner in Switching Power Supply, to produce according to the mode of operation that user selects for the control module (described control module can be logic control circuit or control IC) of control switch pipe break-make and export the modulation signal with this mode of operation corresponding types, and then the mode of operation of Switching Power Supply is limited.
Be described for above-mentioned three kinds of mode of operations, two setting thresholds S1, S2 can be defined for the voltage range of mode select signal Vmode, and S1>S2.When the magnitude of voltage of mode select signal Vmode is greater than S1, correspondence is a kind of mode of operation wherein, such as PFM pattern; When the magnitude of voltage of Vmode is between S1 and S2, corresponding another mode of operation, such as PWM mode; When the magnitude of voltage of Vmode is less than S2, corresponding the third mode of operation, such as US pattern.Control module is according to the mode of operation output pwm signal identified, PFM signal or US signal (namely limiting the PFM signal of low-limit frequency), thus control switch switches power supply to corresponding mode of operation.
According to above-mentioned design philosophy, for mode of operation be N kind (N be greater than 1 positive integer) Switching Power Supply, only need for voltage range definition N-1 the setting threshold of mode select signal Vmode, and the magnitude of voltage of mode select signal Vmode reality inputted and a described N-1 setting threshold compare, and can judge the mode of operation that user selectes.
Consider in existing Switching Power Supply, control module for generation of modulation signal selects Digital Logic control chip usually, be applicable to the situation receiving digital quantity signal, the present embodiment is Design Mode selection circuit in Switching Power Supply, receive the mode select signal Vmode of the analog quantity of outside input, and convert the mode enable signal of N railway digital amount to, the PWM mode enable signal PWM_EN of such as switching value form, PFM mode enable signal PFM_EN, US mode enable signal US_EN etc., export control module to, limit the PWM that described control module exports, the modulation signals such as PFM, and then control switch switches power supply to PWM, the mode of operations such as PFM or US, realize the multi-mode switching function of Switching Power Supply.
As the specific design mode of described mode selection circuit, the present embodiment proposes a kind of hardware teaming method adopting comparator to coordinate Digital Logical Circuits, shown in Fig. 2, Fig. 3.Be described for N=3, the mode of operation for Switching Power Supply is the situation of three kinds, and two-way comparator CMP1, CMP2 can be selected to coordinate three railway digital logical circuits to build described mode selection circuit.Voltage range according to the mode select signal Vmode of input defines two setting thresholds S1, S2, such as: S1=2V, S2=1.2V.Corresponding to two setting thresholds S1, S2, threshold voltage can be provided by the bleeder circuit of Switching Power Supply inside.Threshold voltage corresponding to two setting thresholds S1, S2 is transferred to respectively the in-phase input end of comparator CMP1, CMP2+, the inverting input of two comparators CMP1, CMP2-all receive described mode select signal Vmode.When the magnitude of voltage of mode select signal Vmode is greater than S1, the equal output low level of comparator CMP1, CMP2, i.e. M1=0, M2=0; When the magnitude of voltage of mode select signal Vmode is between S1 and S2, comparator CMP1 exports high level, comparator CMP2 output low level, i.e. M1=1, M2=0; When the magnitude of voltage of mode select signal Vmode is less than S2, comparator CMP1, CMP2 all export high level, i.e. M1=1, M2=1.Suppose that mode enable signal PWM_EN, PFM_EN, US_EN are high level effective, namely corresponding mode of operation is chosen during high level, then according to above-mentioned mode select signal Vmode magnitude of voltage corresponding to the definition mode of mode of operation, the mapping table that the magnitude of voltage of Vmode and the output of comparator CMP1, CMP2 and mode enable signal set high can be obtained, as shown in table 1:
| Vmode voltage | M1 | M2 | Select signal |
| 1.2V≤Vmode≤2V | 1 | 0 | PWM_EN=1 |
| Vmode>2V | 0 | 0 | PFM_EN=1 |
| Vmode<1.2V | 1 | 1 | US_EN=1 |
Table 1.
The logical expression of the corresponding relation of mode enable signal PWM_EN, PFM_EN, US_EN and M1, M2 can be drawn by table 1:
。
Three railway digital logical circuits can be constructed, to generate mode enable signal PWM_EN, PFM_EN, US_EN of required three-way switch amount according to above-mentioned logical expression.As shown in Figure 3, for PWM mode enable signal PWM_EN, the on-off model M2 that comparator CMP2 can be exported is first after not gate U11 negate, the on-off model M1 exported by NAND gate U12 and comparator CMP1 carries out NAND operation, then by after not gate U13 negate, the PWM mode enable signal PWM_EN described in output.For PFM mode enable signal PFM_EN, can by comparator CMP1, CMP2 export on-off model M1, M2 first respective via a road after not gate U21, U22 carry out negate respectively, transfer to NAND gate U23 again and carry out NAND operation, then by after not gate U24 negate, the PFM mode enable signal PFM_EN described in output.For US mode enable signal US_EN, then on-off model M1, M2 that comparator CMP1, CMP2 export directly can be transferred to after NAND gate U31 carries out NAND operation, only have not gate U32 to carry out negate, obtain described US mode enable signal US_EN.
Certainly, also the NAND gate U12 in Fig. 3, U23, U31 and not gate U13, U24, U32 of being connected with its output can be replaced to one and door respectively, required mode enable signal PWM_EN, PFM_EN, US_EN can be obtained equally.For the concrete teaming method of described Digital Logical Circuits, the present embodiment is not limited in above citing.
Three tunnel mode enable signal PWM_EN, PFM_EN, the US_EN exported by mode selection circuit are transferred to control module, described control module can be controlled and switch to corresponding mode of operation.
Certainly, mode of operation for Switching Power Supply is not three kinds of situations, such as, under Switching Power Supply can also be operated in DPWM pattern (digital PWM pattern) or DPFM pattern (digital PFM pattern), the quantity N of the mode of operation then can supported for Switching Power Supply, select N-1 road comparator to compare with the N-1 road setting threshold preset, export N-1 way switch amount signal; Then, the difference of the modulation signal type corresponding to the different magnitudes of voltage of the mode select signal Vmode preset, determine the logic corresponding relation between N road mode enable signal and described N-1 way switch amount signal, and then build N railway digital logical circuit according to described logic corresponding relation, N road mode enable signal needed for generation, realizes the selection of Switching Power Supply in N kind mode of operation and switches.
Due under ultrasound mode, need to limit the low-limit frequency of the pulse frequency modulated signal that control module exports, therefore, the US mode enable signal US_EN exported by mode selection circuit is transferred to a ultrasonic gauge by the present embodiment simultaneously, when US_EN be high level effective time, start ultrasonic gauge to run, the sprocket pulse of 20KHz is greater than according to its timing time (being less than 50um) generated frequency, transfer to described control module, more than the 20KHz of the frequency maintenance of the modulation signal that restricted passage control module exports, to avoid the generation of switching noise.
As a kind of preferred design of the present embodiment, the timing time arranging described ultrasonic gauge is 40um, the frequency of corresponding sprocket pulse is 25KHz, the audibility range being compared people's ear by the switching frequency arranging Switching Power Supply reserves certain surplus, to eliminate audio-frequency noise better, make Switching Power Supply in noise, have better performance.
For the consideration to switch power work secure context, the present embodiment detects the load current that Switching Power Supply exports, specifically can adopt and connect current sampling circuit at the power supply output of Switching Power Supply, utilize the load current in current sampling circuit acquisition system, and convert load voltage Vx to and feed back to Switching Power Supply, by comparing with the higher limit Vlimit preset, and then when load voltage Vx exceeds higher limit Vlimit, shield each road mode enable signal exported by mode selection circuit, and then make control module out of service, enter guard mode.
In order to realize above-mentioned purpose of design, the present embodiment designs another road comparator CMP3 in described Switching Power Supply, as shown in Figure 1, by the upper voltage limit corresponding to the in-phase input end of comparator CMP3+connection higher limit Vlimit, described upper voltage limit Vlimit can be provided by the bleeder circuit of Switching Power Supply inside equally.When load voltage Vx exceeds higher limit Vlimit, the effective guard signal M3 of comparator CMP3 output low level, transfer to three tunnels and door U1 respectively, U2, one of them input of U3, Jiang Sanlu and door U1, U2, the another one input of U3 connects one to one with three tunnel mode enable signal output parts of mode selection circuit respectively, receive three tunnel mode enable signal PWM_EN, PFM_EN, US_EN and with low level guard signal M3 carry out with computing after, the mode enable signal PWM_EN_1 that output low level is invalid, PFM_EN_1, US_EN_1, control described control module out of service, reach the object of overcurrent protection.And when load voltage Vx is lower than higher limit Vlimit; the guard signal then exported by comparator CMP3 is high level; with three tunnel mode enable signal PWM_EN, PFM_EN, US_EN carry out with computing after; the low and high level state of three tunnel mode enable signal PWM_EN, PFM_EN, US_EN can not be changed, realize the accurate switching to control module mode of operation.
For ultrasonic gauge, the US mode enable signal US_EN_1 by exporting with door U3 can be received, with control ultrasonic gauge only in system cloud gray model safety and user selects ultrasound mode time startup optimization, be provided for the sprocket pulse of limit switch lower-frequency limit value to control module.
No matter Switching Power Supply work in what mode, automatically pulse duration or the pulse frequency of the modulation signal exported by control module can be regulated according to the feedback voltage V x received, to maintain the voltage stabilization that Switching Power Supply exports, then meet the need for electricity of successive load.
Adopt the Switching Power Supply that the present embodiment proposes, when Switching Power Supply work in a PWM mode time, in the process of load jump, output voltage can the change of responsive load electric current fast in several switch periods, make output voltage there will not be larger fluctuation, embody the advantage that PWM mode can realize response fast.When Switching Power Supply is operated under PFM pattern, its switching frequency can reduce with load current always, has higher light-load efficiency.When Switching Power Supply is operated under US pattern, can limits switching frequency when underloading is even unloaded, therefore under underloading or the condition of zero load, best embody its work characteristics, and effectively can avoid the interference of audio-frequency noise.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement, also should belong to protection range of the present utility model.
Claims (9)
1. support the Switching Power Supply that multi-mode switches, comprise switching tube, for the control module that controls described switching tube break-make and the voltage conversion circuit be communicated with described switching tube; It is characterized in that: in described Switching Power Supply, be provided with mode selection pin, receive the mode select signal of outside input, and to control module transmission; Described control module limits the type of the modulation signal that it exports according to described mode select signal, transfers to described switching tube, after limiting the mode of operation of Switching Power Supply, through the voltage needed for voltage conversion circuit output loading.
2. the Switching Power Supply that switches of support multi-mode according to claim 1, it is characterized in that: described mode select signal is a road analog signal, the mode of operation of described Switching Power Supply support is N kind, described N be greater than 1 integer; Mode selection circuit is provided with in Switching Power Supply, mode select signal described in described mode selection circuit receives, and be processed into the mode enable signal of N railway digital amount, transfer to described control module, limit the type of the modulation signal that described control module exports.
3. the Switching Power Supply of support multi-mode switching according to claim 2, it is characterized in that: in described mode selection circuit, be provided with N-1 road comparator and N railway digital logical circuit, described mode select signal transfers to N-1 road comparator correspondingly and compares with the N-1 road threshold voltage preset, and exports N-1 way switch amount signal; The difference of the modulation signal type corresponding to the different magnitudes of voltage of the mode select signal preset, determine the logic corresponding relation between N road mode enable signal and described N-1 way switch amount signal, and then build N railway digital logical circuit according to described logic corresponding relation, the N road mode enable signal needed for generation.
4. the Switching Power Supply of support multi-mode switching according to claim 3, is characterized in that: described Switching Power Supply supports three kinds of mode of operations, is respectively pulse-width-modulated mode, pulse frequency modulated pattern and ultrasound mode; The ultrasound mode enable signal that described mode selection circuit conversion exports transfers to a ultrasonic gauge, the timing time of described ultrasonic gauge is less than 50 microseconds, export sprocket pulse to described control module, limit the frequency of the pulse frequency modulated signal that described control module exports under ultrasound works pattern at more than 20KHz.
5. the Switching Power Supply of support multi-mode switching according to claim 4, it is characterized in that: described comparator is provided with two-way, the in-phase input end of first via comparator receives first threshold voltage, and the mode select signal described in inverting input receives, exports the first on-off model; The in-phase input end of the second road comparator receives Second Threshold voltage, the mode select signal described in inverting input receives, and exports second switch amount signal; Wherein, first threshold voltage is greater than Second Threshold voltage.
6. the Switching Power Supply of support multi-mode switching according to claim 5, is characterized in that: described Digital Logical Circuits is provided with three tunnels:
A NAND gate and two not gates are provided with in first via Digital Logical Circuits, after described second switch amount signal carries out negate computing by one of them not gate, export to after NAND gate carries out NAND operation with described first on-off model, export another one not gate to and carry out negate computing, and then output pulse width modulating mode enable signal;
A NAND gate and three not gates are provided with in the second railway digital logical circuit, after described first on-off model and second switch amount signal carry out negate computing via a not gate separately, transfer to NAND gate respectively and carry out NAND operation, then export to after the 3rd not gate carry out negate computing, output pulse frequency modulating mode enable signal;
A NAND gate and a not gate is provided with in the 3rd railway digital logical circuit, after described NAND gate carries out NAND operation to the first described on-off model and second switch amount signal, export not gate to and carry out negate computing, and then export ultrasound mode enable signal.
7. the Switching Power Supply of support multi-mode switching according to claim 5, is characterized in that: described Digital Logical Circuits is provided with three tunnels:
One and door and a not gate is provided with in first via Digital Logical Circuits, after described second switch amount signal carries out negate computing by not gate, export to and carry out and computing with described first on-off model with door, and then output pulse width modulating mode enable signal;
One and door and two not gates are provided with in the second railway digital logical circuit, after described first on-off model and second switch amount signal carry out negate computing via a not gate separately, transfer to respectively and carry out and computing with door, and then output pulse frequency modulating mode enable signal;
In the 3rd railway digital logical circuit, be provided with one and door, described with door to the first described on-off model and second switch amount signal carry out with computing after, export ultrasound mode enable signal.
8. the Switching Power Supply that the support multi-mode according to any one of claim 2 to 7 switches, it is characterized in that: be connected with load current sample circuit at the output of described Switching Power Supply, described load current sample circuit converts load current to load voltage and feeds back to Switching Power Supply.
9. the Switching Power Supply of support multi-mode switching according to claim 8; it is characterized in that: described load voltage feeds back to another road comparator in Switching Power Supply; the load voltage received and the higher limit preset compare by another road comparator described; output protection signal and N road mode enable signal respectively via N road and door carry out respectively with computing after, transfer to described control module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104242649A (en) * | 2014-10-15 | 2014-12-24 | 青岛歌尔声学科技有限公司 | Multi-mode switching method of switching power supply and switching power supply |
| CN108023796A (en) * | 2018-01-12 | 2018-05-11 | 普联技术有限公司 | Customer terminal equipment, switch method of remote signal method, control device and storage medium |
| CN108023796B (en) * | 2018-01-12 | 2023-05-16 | 上海联虹技术有限公司 | Client terminal device, signal switching control method, control device, and storage medium |
| CN109494982A (en) * | 2018-12-24 | 2019-03-19 | 上海艾为电子技术股份有限公司 | A kind of Switching Power Supply control mode switch circuit and switching power source chip |
| CN109494982B (en) * | 2018-12-24 | 2023-10-27 | 上海艾为电子技术股份有限公司 | Switching power supply control mode switching circuit and switching power supply chip |
| WO2023169470A1 (en) * | 2022-03-08 | 2023-09-14 | 深圳英集芯科技股份有限公司 | Critical-value oscillation control apparatus and device, and wireless earphone |
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