CN103248225B - Power supply change-over device, power conversion unit changing method and electronic equipment - Google Patents
Power supply change-over device, power conversion unit changing method and electronic equipment Download PDFInfo
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Abstract
The changing method of power supply change-over device, power conversion unit and electronic equipment, described power supply change-over device comprises: input, and configuration is connected with power supply, and receives input voltage; Output, configuration is connected with load, and provides output voltage to load; Power conversion unit, comprising: the first power conversion unit, and input voltage is converted to output voltage by configuration, and makes output voltage stabilization; Second source converting unit, input voltage is converted to output voltage by configuration, and make output voltage stabilization, wherein when the ratio of output voltage and input voltage is greater than first threshold, the first power conversion unit has the power supply conversion efficiency higher than second source converting unit; Power conversion unit selected cell, configuration detects the information corresponding with the ratio of output voltage and input voltage, and based on Information Selection first power conversion unit corresponding with ratio and second source converting unit.
Description
Technical field
The present invention relates to the changing method of the power conversion unit in a kind of power supply change-over device, power supply change-over device and apply the electronic equipment of this power supply change-over device.
Background technology
In the electronic equipment of such as mobile phone or panel computer and so on, the voltage of voltage transitions needed for electronic device works that battery produces by the various step down supplies conversion equipment of usual employing, and battery is powered by all parts of step down supplies conversion equipment to electronic equipment.
The step down supplies conversion equipment adopted in the electronic equipment of such as mobile phone or panel computer and so on generally includes linearly (Linear) power conversion unit and copped wave (Buck) power conversion unit.The input voltage of power supply change-over device higher (as, the battery electric quantity of electronic equipment causes greatly the output voltage of battery higher), namely the output voltage of power supply change-over device and its input voltage (as, the output voltage of battery) lower time, Buck power conversion unit has good power supply conversion efficiency usually.But, the input voltage of power supply change-over device lower (as, the lower output voltage of battery that causes of the battery electric quantity of electronic equipment is lower than predetermined threshold), namely the output voltage of power supply change-over device and its input voltage (as, the output voltage of battery) lower time, the power supply conversion efficiency of Buck power conversion unit can not meet the needs of stable output voltage.Here, when the input voltage of the power supply of electronic equipment is lower, the power supply conversion efficiency of linear power supply converting unit is higher than power of chopping conversion equipment.
Summary of the invention
In order to solve above-mentioned technical problem of the prior art, according to an aspect of the present invention, providing a kind of power supply change-over device, comprising: input, configuration is connected with power supply, and receives input voltage; Output, configuration is connected with load, and provides output voltage to load; Power conversion unit, comprising: the first power conversion unit, and input voltage is converted to output voltage by configuration, and makes output voltage stabilization; Second source converting unit, input voltage is converted to output voltage by configuration, and make output voltage stabilization, wherein when the ratio of output voltage and input voltage is greater than first threshold, the first power conversion unit has the power supply conversion efficiency higher than second source converting unit; Power conversion unit selected cell, configuration detects the information corresponding with the ratio of output voltage and input voltage, and based on Information Selection first power conversion unit corresponding with ratio and second source converting unit.
In addition, according to a further aspect in the invention, provide a kind of power conversion unit changing method, be applied to power supply change-over device, described device comprises input, and configuration is connected with power supply, and receives input voltage; Output, configuration is connected with load, and provides output voltage to load; Power conversion unit, comprises the first power conversion unit, and input voltage is converted to output voltage by configuration, and makes output voltage stabilization; Second source converting unit, input voltage is converted to output voltage by configuration, and make output voltage stabilization, wherein when the ratio of output voltage and input voltage is greater than first threshold, first power conversion unit has the power supply conversion efficiency higher than second source converting unit, and changing method comprises: detect the information corresponding with the ratio of output voltage and input voltage; And based on Information Selection first power conversion unit corresponding with ratio and second source converting unit.
In addition, according to a further aspect in the invention, provide a kind of electronic equipment, comprising: power supply change-over device, comprising: input, configuration is connected with power supply, and receives input voltage; Output, configuration is connected with load, and provides output voltage to load; Power conversion unit, comprising: the first power conversion unit, and input voltage is converted to output voltage by configuration, and makes output voltage stabilization; Second source converting unit, input voltage is converted to output voltage by configuration, and make output voltage stabilization, wherein when the ratio of output voltage and input voltage is greater than first threshold, the first power conversion unit has the power supply conversion efficiency higher than second source converting unit; Power conversion unit selected cell, configuration detects the information corresponding with the ratio of output voltage and input voltage, and based on Information Selection first power conversion unit corresponding with ratio and second source converting unit.
By above-mentioned configuration, detect the output voltage of power supply change-over device and the ratio of input voltage.If the ratio of the output voltage of power supply change-over device and input voltage is less than or equal to first threshold, then select second source converting unit, otherwise select the first power conversion unit.In this case, high power supply conversion efficiency can be provided when selecting suitable power conversion unit to come different according to the voltage being supplied to power supply change-over device, thus improve the performance of whole electronic equipment.
Accompanying drawing explanation
Fig. 1 is the block diagram of diagram according to the power supply change-over device of the embodiment of the present invention;
Fig. 2 is the schematic block diagram of diagram according to the structure of all parts of the power supply change-over device of the embodiment of the present invention; And
Fig. 3 is the flow chart of diagram according to the changing method of the power conversion unit of the embodiment of the present invention.
Embodiment
Describe in detail with reference to the accompanying drawings according to each embodiment of the present invention.Here it is to be noted that it in the accompanying drawings, identical Reference numeral is given there is identical or similar structures and function part substantially, and the repeated description of will omit about them.
Power supply change-over device according to the embodiment of the present invention will briefly be described below.Fig. 1 is the block diagram of diagram according to the power supply change-over device of the embodiment of the present invention.As shown in Figure 1, the power supply change-over device adopted in the electronic equipment of such as mobile phone, notebook computer or panel computer and so on can comprise: input 1, output 2, power conversion unit 3 (comprising linear power supply converting unit 31, power of chopping converting unit 32) and power conversion unit selected cell 4.
Here, the input 1 of power supply change-over device can connect with the DC power supply of electronic equipment (e.g., battery), and for receiving input voltage from power supply.The output of power supply change-over device can with each load of electronic equipment (as, processor, display screen, communication module etc.) connect, and provide output voltage (that is, the operating voltage of all parts of electronic equipment) to these loads.
In addition, linear (Linear) power conversion unit 31 in power conversion unit 3 can be arranged between input 1 and output 2, and the input voltage of input 1 can be converted to the output voltage of output 2, and make this output voltage stabilization.Copped wave (Buck) power conversion unit 32 in power conversion unit 3 can be arranged between input 1 and output 2, and the input voltage of input 1 can be converted to the output voltage of output 2, and makes this output voltage stabilization.Here, the input voltage of input 1 higher (as, the output voltage of the battery of electronic equipment is higher), namely the output voltage of power supply change-over device and its input voltage (as, the output voltage of battery) ratio lower time, Buck power conversion unit has good power supply conversion efficiency usually.But, the input voltage of input 1 lower (as, the lower output voltage of battery that causes of the battery electric quantity of electronic equipment is lower than specific threshold), namely the output voltage of power supply change-over device and its input voltage (as, the output voltage of battery) lower time, the power supply conversion efficiency of Linear power conversion unit is higher than Buck power conversion unit.
Power conversion unit selected cell 4 can detect the information corresponding with the output voltage of power supply change-over device and the ratio of input voltage, and based on the Information Selection Linear power conversion unit corresponding with ratio and Buck power conversion unit.Such as, when ratio between the output voltage and input voltage of power supply change-over device is higher than predetermined threshold value, power conversion unit selected cell 4 can select Linear power conversion unit 31, otherwise power conversion unit selected cell 4 can select Buck power conversion unit 32.Here, predetermined threshold can be determined based on the power supply conversion efficiency when different inputs, output voltage ratio of Linear power conversion unit and Buck power conversion unit, and can be experiment value or empirical value.
Then, with reference to Fig. 2, the 26S Proteasome Structure and Function according to all parts of the power supply change-over device of the embodiment of the present invention is described.Fig. 2 is the schematic block diagram of diagram according to the structure of all parts of the power supply change-over device of the embodiment of the present invention.
As shown in Figure 2, input 1, output 2, feedback unit 300, reference voltage generation unit 301, error amplifying unit 302, driver element 303, triangular wave concussion unit 304, pwm unit 305, driver element 306, metal-oxide-semiconductor 307, inductor 308, diode 309, output capacitor 310, duty ratio detecting unit 400 can be comprised according to the power supply change-over device of the embodiment of the present invention, drive switch control unit 401 and drive switch unit 402.Here, Linear power conversion unit 31 shown in Fig. 1 comprises feedback unit 300, reference voltage generation unit 301, error amplifying unit 302, driver element 303 and metal-oxide-semiconductor 307, and Buck power conversion unit comprises feedback unit 300, reference voltage generation unit 301, error amplifying unit 302, triangular wave concussion unit 303, pwm unit 305, second driver element 306 and MOS (metal-oxide-semiconductor) transistor 307.Here, because the function and structure of Linear power conversion unit 31 and Buck power conversion unit 32 is known to those skilled in the art, therefore only it is simply described here.
As shown in Figure 2, feedback unit 300 is connected with output 2, and can produce feedback voltage based on output voltage.Reference voltage generation unit 301 can produce predetermined reference voltage.Error amplifying unit 302 is connected with feedback unit 300 and reference voltage generation unit 301, and the voltage difference between the reference voltage that the feedback voltage that feedback voltage 300 can be produced and reference voltage generation unit 301 produce is amplified, and the voltage difference of amplification is exported as error amplification signal.Driver element 303 is connected with error amplifying unit 302, and the error amplification signal from error amplifying unit 302 can be converted to the drive singal for driven MOS pipe 307.Here, according to another embodiment of the invention, when the error amplification signal of error amplifying unit 302 is enough large, can directly utilize the error amplification signal of error amplifier 302 as drive singal (namely without the need to arranging driver element 303).
Metal-oxide-semiconductor 307 is arranged between input 1 and output 2, and can be connected with driver element 303.When metal-oxide-semiconductor 307 is connected with driver element 303, metal-oxide-semiconductor 307 can based on the output voltage of the drive singal regulation output end 2 of driver element 303, and make the output voltage of output 2 keep substantially constant.
Triangular wave concussion unit 304 can produce the triangular signal (as: triangular wave, sawtooth waveforms etc.) of the level with triangle shape.
Pulse width modulation (PWM) unit 305 shakes unit 304 with error amplifying unit 302 and triangular wave and is connected, and can compare based on the triangular signal of the error amplification signal of error amplifying unit 302 and triangular wave concussion unit 304, and result produces the pulse signal through pulse width modulation based on the comparison.Such as, when level higher than triangular signal of the level of error amplification signal, pwm unit 305 can export high level signal, and when level lower than triangular signal of the level of error amplification signal, pwm unit 305 can output low level signal.Therefore, if the change due to the load of electronic equipment causes the level of error amplification signal to change, the duty ratio of the output (pulse-modulated signal) of pwm unit 305 (high level time/high level and the time in a low level whole cycle) also can change.Here, the pulse-modulated signal of pwm unit 305 has the shape of square wave.
Driver element 306 is connected with pwm unit 305, and the pulse-modulated signal from pwm unit 305 can be converted to the drive singal for driven MOS pipe 307.In addition, driver element 306 can also be connected with metal-oxide-semiconductor 307, and when metal-oxide-semiconductor 307 is connected with driver element 306, metal-oxide-semiconductor 307 can based on the output voltage of the drive singal regulation output end 2 of driver element 306, and make the output voltage of output 2 keep substantially constant.
Here, feedback unit 300, reference voltage generation unit 301, error amplifying unit 302, driver element 303 and metal-oxide-semiconductor 307 can the Linear power conversion units 31 shown in composition diagram 1.In this case, if the load of Linear power conversion unit 31 changes (as, standby or operating state of electronic equipment etc.), then also can change at the output voltage of output 2, thus cause the feedback voltage of feedback unit 300 to change.Here, because error amplifying unit 302 amplifies the difference of reference voltage and feedback voltage, therefore the output of error amplifying unit 302 also can change, the change of the drive singal causing driver element 303 to export thus, the change of drive singal then causes the change of the output current of metal-oxide-semiconductor 307, thus the output voltage of regulation output end 2 can keep substantially constant to make it.
In addition, feedback unit 300, reference voltage generation unit 301, error amplifying unit 302, triangular wave concussion unit 304, pwm unit 305, driver element 306 and metal-oxide-semiconductor 307 can the Buck power conversion unit shown in composition diagram 1.In this case, if the load of Buck power conversion unit 32 changes (as, standby or operating state of electronic equipment etc.), then also can change at the output voltage of output 2, thus cause the feedback voltage of feedback unit 300 to change.Here, because error amplifying unit 302 amplifies the difference of reference voltage and feedback voltage, therefore the output of error amplifying unit 302 also can change.In this case, the duty ratio of the pulse signal that pulse width modulation (PWM) unit 305 produces also can change, the duty ratio of the drive singal of driver element 306 is caused also correspondingly to change thus, thus make the on/off time of metal-oxide-semiconductor 307 that corresponding change occur, thus the output voltage of output 2 can be made to keep substantially constant based on drive singal.
In addition, output voltage due to Buck power conversion unit 32 has impulse waveform (by having the drive singal driven MOS pipe 307 of impulse waveform), and therefore Buck power conversion unit 32 can further include inductor 308, diode 309 and output capacitor 310.Inductor 308 is connected between metal-oxide-semiconductor 307 and output 2, diode 309 is connected between the tie point of inductor 308 and metal-oxide-semiconductor 307 and earth potential (Ground), and between the output that output capacitor 310 is connected to inductor 308 and earth potential.Inductor 308, diode 309 and output capacitor 310 composition is used for voltage/current that filtering exports from metal-oxide-semiconductor 307 and makes the voltage/current of filtering become the filter unit of the operable VD/electric current of load of electronic equipment.Here, because the function and structure of the filter unit of inductor 308, diode 309 and capacitor 310 composition is known to those skilled in the art, the detailed description about them is therefore omitted here.
Here, because the subelement in Linear power conversion unit 31 and Buck power conversion unit 32 has identical 26S Proteasome Structure and Function, therefore by make Linear power conversion unit 31 and Buck power conversion unit 32 shared portion element (as, feedback unit 300, reference voltage generation unit 301, error amplifying unit 302 and metal-oxide-semiconductor 307 etc.), the complexity of the power supply change-over device comprising Linear and Buck power conversion unit can be reduced, and the complexity of power supply change-over device can be reduced.
As shown in Figure 2, duty ratio detecting unit 400, driving switch control unit 401 and driving switch unit 402 constitute the power conversion unit selected cell 4 shown in Fig. 1.
Duty ratio detecting unit 400 is connected with pwm unit 305, and can detect the duty ratio of the output of pwm unit 305.According to one embodiment of present invention, duty ratio detecting unit 400 can be realized by arbitrary duty detection circuit, and can export the duty ratio detection signal corresponding with the duty ratio of the pulse signal of pwm unit 305.Drive switch control unit 401 to be connected with duty ratio detecting unit 400, and control signal can be produced based on the output (duty ratio detection signal) with duty ratio detecting unit 400.Drive switch unit 402 to be connected with driving switch control unit 401, and be arranged on driver element 303, between driver element 306 and metal-oxide-semiconductor 307.Drive switch unit 402 can be electronic switch, and one of driver element 303, driver element 306 can be connected with metal-oxide-semiconductor 307 based on the control signal driving switch control unit 401 to provide, thus Linear power conversion unit 31 and Buck power conversion unit 32 can be selected.
Particularly, switch control unit 401 is driven to receive duty ratio detection signal and the duty ratio of pulse signal based on this signal acquisition pwm unit 305 from duty ratio detecting unit 400.Here, because the pulse signal of pwm unit 305 is for controlling the on/off of metal-oxide-semiconductor 307, and the ratio of the voltage between the two ends of metal-oxide-semiconductor 307 is determined by the turn-on time of metal-oxide-semiconductor 307 and the ratio in whole cycle, the ratio therefore between the output voltage of output 2 and the input voltage of input 1 equals the duty ratio of the pulse signal of pwm unit 305.Then, drive switch control unit 401 obtained duty ratio and the threshold value preset to be compared, and result produce control signal to select Linear power conversion unit and Buck power conversion unit based on produced control signal based on the comparison.Describe like that just as in the previous, the threshold value preset represents the threshold value of the ratio between output voltage and input voltage, and predetermined threshold can be determined based on the power supply conversion efficiency when different inputs, output voltage ratio of Linear power conversion unit and Buck power conversion unit, and can be experiment value or empirical value.In this case, when duty ratio is greater than this predetermined threshold value, Linear power conversion unit 31 has better power supply conversion efficiency.In this case, if drive switch control unit 401 to determine that the duty ratio that duty ratio detecting unit 400 detects is greater than predetermined threshold value, switch control unit 401 is driven to control to drive switch unit 402 to select Linear power conversion unit.Particularly, drive switch control unit 401 to send control signals to and drive switch unit 402, make to drive switch unit 402 to be connected to select Linear power conversion unit 31 with metal-oxide-semiconductor 307 by driver element 303.In addition, if drive switch control unit 401 to determine that the duty ratio that duty ratio detecting unit 400 detects is less than or equal to predetermined threshold value, switch control unit 401 is driven to control to drive switch unit 402 to select Buck power conversion unit 32.Particularly, drive switch control unit 401 to send control signals to and drive switch unit 402, make to drive switch unit 402 to be connected to select Buck power conversion unit 32 with metal-oxide-semiconductor 307 by driver element 306.
Be described above according to exemplary embodiment of the present invention, but, the present invention is not limited thereto.Such as, power conversion unit selected cell 4 can the input voltage of direct-detection input 1 and the output voltage of output 2, and calculates the ratio of output voltage and input voltage.After the ratio obtaining output voltage and input voltage, this ratio and predetermined threshold compare by the driving switch control unit 401 in power conversion unit selected cell 4, and output control drives switch unit 402 to select Buck power conversion unit 32 or Linear power conversion unit 31 based on the comparison.In addition, only can also detect the input voltage of input 1, and when input voltage is less than a threshold value by controlling to drive switch unit 402 to select Linear power conversion unit 31, or when input voltage is more than or equal to this threshold value by controlling to drive switch unit 402 to select Buck power conversion unit 32.
By above-mentioned configuration, detect the output voltage of power supply change-over device and the ratio of input voltage.If the ratio of the output voltage of power supply change-over device and input voltage is less than or equal to predetermined threshold value, then select Buck power conversion unit 32, otherwise select Linear power conversion unit 31.In this case, high power supply conversion efficiency can be provided when selecting suitable power conversion unit to come different according to the voltage being supplied to power supply change-over device, thus improve the performance of whole electronic equipment.Such as, when the electricity deficiency of the battery of electronic equipment, perform Power convert by Linear power conversion unit 31, and when the electricity abundance of the battery at electronic equipment, perform Power convert by Buck power conversion unit 31.
Be described above the power supply change-over device according to the embodiment of the present invention, describe the power conversion unit changing method according to the embodiment of the present invention below with reference to Fig. 3.Power conversion unit changing method according to the embodiment of the present invention can be applied in power supply change-over device as illustrated in figs. 1 and 2.Here, owing to being described in detail power supply change-over device above, therefore only it has simply been described here.Comprise input 1 according to the power supply change-over device of the embodiment of the present invention, it is connected with power supply and receives input voltage; Output 2, it is connected with load and load provides output voltage; Power conversion unit 3, comprises Linear power conversion unit 31, is converted to output voltage and makes output voltage stabilization for input voltage; Buck power conversion unit 32, output voltage is converted to and output voltage stabilization for input voltage, wherein when the ratio of output voltage and input voltage is greater than predetermined threshold value, Linear power conversion unit has the power supply conversion efficiency higher than Buck power conversion unit.Here, power conversion unit 3 specifically comprises feedback unit 300, is connected and can produces feedback voltage based on output voltage with output; Reference voltage generation unit 301, for generation of reference voltage; Error amplifying unit 302, is connected with feedback unit 300 and reference voltage generation unit 301, and the voltage difference between feedback voltage and reference voltage can be amplified and produce error amplification signal; Driver element 303, is connected with error amplifying unit 302, and is converted to drive singal for error amplification signal; Triangular wave concussion unit 304, for generation of the triangular signal of voltage with triangle shape; Pwm unit 305, shakes unit 304 with error amplifying unit 302 and triangular wave and is connected, and can produce pulse signal through pulse width modulation based on error amplification signal and triangular signal; Driver element 306, is connected with pwm unit 305, and pulse signal can be converted to drive singal; And metal-oxide-semiconductor 307, be arranged between input 1 and output 2, metal-oxide-semiconductor 307 can be connected with driver element 303 or driver element 306, and can based on the output voltage of the drive singal regulation output end 2 of the drive singal of driver element 303 or driver element 306.Here the Linear power conversion unit 31 shown in Fig. 1 comprises feedback unit 300, reference voltage generation unit 301, error amplifying unit 302, driver element 303 and metal-oxide-semiconductor 307, and Buck power conversion unit 32 comprises feedback unit 300, reference voltage generation unit 301, error amplifying unit 302, triangular wave concussion unit 304, pwm unit 305, second driver element 306 and metal-oxide-semiconductor 307.
As shown in Figure 3, in step S301, detect the information corresponding with the ratio of output voltage and input voltage.
Particularly, as described for Fig. 2, duty ratio detecting unit 400 detects the duty ratio of the output of pwm unit 305, and exports the duty ratio detection signal corresponding with the duty ratio of the pulse signal of pwm unit 305.Here, because the pulse signal of pwm unit 305 is for controlling the on/off of metal-oxide-semiconductor 307, and the ratio of the voltage between the two ends of metal-oxide-semiconductor 307 is determined by the turn-on time of metal-oxide-semiconductor 307 and the ratio (corresponding to duty ratio) in whole cycle, the ratio therefore between the output voltage of output 2 and the input voltage of input 1 equals the duty ratio of the pulse signal of pwm unit 305.
In addition, according to another embodiment of the invention, all right input voltage of direct-detection input 1 of power conversion unit selected cell 4 and the output voltage of output 2, and calculate the ratio of output voltage and input voltage.In addition, because the output voltage of output 2 is substantially constant, the input voltage that therefore only can also detect input 1 is to obtain the information relevant to the ratio of output voltage and input voltage.
Then, in step S302, based on the Information Selection Linear power conversion unit corresponding with ratio and Buck power conversion unit.
Particularly, switch control unit 401 is driven to receive duty ratio detection signal and the duty ratio of pulse signal based on this signal acquisition pwm unit 305 from duty ratio detecting unit 400.Then, drive switch control unit 401 obtained duty ratio and the threshold value preset to be compared, and result produce control signal to select Linear power conversion unit and Buck power conversion unit based on produced control signal based on the comparison.Here, when duty ratio is greater than this predetermined threshold value, Linear power conversion unit 31 has better power supply conversion efficiency.In this case, if drive switch control unit 401 to determine that the duty ratio that duty ratio detecting unit 400 detects is greater than predetermined threshold value, switch control unit 401 is driven to control to drive switch unit 402 to select Linear power conversion unit.Particularly, drive switch control unit 401 to send control signals to and drive switch unit 402, make to drive switch unit 402 to be connected to select Linear power conversion unit 31 with metal-oxide-semiconductor 307 by driver element 303.In addition, if drive switch control unit 401 to determine that the duty ratio that duty ratio detecting unit 400 detects is less than or equal to predetermined threshold value, switch control unit 401 is driven to control to drive switch unit 402 to select Buck power conversion unit 32.Particularly, drive switch control unit 401 to send control signals to and drive switch unit 402, make to drive switch unit 402 to be connected to select Buck power conversion unit 32 with metal-oxide-semiconductor 307 by driver element 306.
In addition, according to another embodiment of the invention, at the input voltage of direct-detection input 1 and the output voltage of output 2 and when calculating the ratio of output voltage and input voltage, drive switch control unit 401 obtained ratio and the threshold value preset to be compared, and result produce control signal to select Linear power conversion unit and Buck power conversion unit based on produced control signal based on the comparison.In addition, when only detecting the input voltage of input 1, drive switch control unit 401 input voltage and the voltage threshold preset to be compared, and result produce control signal to select Linear power conversion unit and Buck power conversion unit based on produced control signal based on the comparison.
Be described above the power conversion unit changing method that power supply change-over device and power supply change-over device are according to an exemplary embodiment of the present invention applied.Can be applied to according to power supply change-over device of the present invention on the electronic equipment of such as smart mobile phone, panel computer or notebook computer and so on.In this case, the electronic equipment of such as smart mobile phone, panel computer or notebook computer and so on can power supply change-over device as shown in Figure 1.This power supply change-over device can comprise: input, and configuration is connected with power supply, and receives input voltage; Output, configuration is connected with load, and provides output voltage to load; Power conversion unit, comprising: Linear power conversion unit, and input voltage is converted to output voltage by configuration, and makes output voltage stabilization; Buck power conversion unit, input voltage is converted to output voltage by configuration, and make output voltage stabilization, wherein when the ratio of output voltage and input voltage is greater than predetermined threshold value, Linear power conversion unit has the power supply conversion efficiency higher than Buck power conversion unit; Power conversion unit selected cell, configuration detects the information corresponding with the ratio of output voltage and input voltage, and based on the Information Selection Linear power conversion unit corresponding with ratio and Buck second source converting unit.
Each embodiment of the present invention is described in detail above.But, it should be appreciated by those skilled in the art that without departing from the principles and spirit of the present invention, various amendment can be carried out to these embodiments, combination or sub-portfolio, and such amendment should fall within the scope of the present invention.
Claims (8)
1. a power supply change-over device, comprising:
Input, configuration is connected with power supply, and receives input voltage;
Output, configuration is connected with load, and provides output voltage to described load;
Power conversion unit, comprising:
First power conversion unit, described input voltage is converted to described output voltage by configuration, and makes described output voltage stabilization;
Second source converting unit, described input voltage is converted to described output voltage by configuration, and make described output voltage stabilization, wherein when the ratio of described output voltage and described input voltage is greater than first threshold, described first power conversion unit has the power supply conversion efficiency higher than described second source converting unit;
Power conversion unit selected cell, configuration detects the information corresponding with the ratio of described output voltage and described input voltage, and based on the first power conversion unit described in the Information Selection corresponding with described ratio and described second source converting unit,
Wherein said power conversion unit comprises:
Feedback unit, is connected with output, and configuration comes to produce feedback voltage based on described output voltage;
Reference voltage generation unit, configuration produces reference voltage;
Error amplifying unit, is connected with described feedback unit and described reference voltage generation unit, and the voltage difference between described feedback voltage and described reference voltage is amplified and produced error amplification signal by configuration;
First driver element, is connected with described error amplifying unit, and described error amplification signal is converted to the first drive singal by configuration;
Triangular wave concussion unit, configuration produces the triangular signal of the voltage with triangle shape;
Pwm unit, shakes unit with described error amplifying unit and described triangular wave and is connected, and configuration produces the pulse signal through pulse width modulation based on described error amplification signal and described triangular signal;
Second driver element, is connected with described pwm unit, and described pulse signal is converted to the second drive singal by configuration; And
MOS (metal-oxide-semiconductor) transistor, be arranged between described input and output, and be connected with the described first or second driver element under the control of described power conversion unit selected cell, configure and regulate based on described first drive singal or described second drive singal the output voltage being supplied to described output
Wherein said first power conversion unit comprises described feedback unit, described reference voltage generation unit, described error amplifying unit, described first driver element and described MOS (metal-oxide-semiconductor) transistor, and second source converting unit comprises described feedback unit, described reference voltage generation unit, described error amplifying unit, the concussion of described triangular wave unit, described pwm unit, described second driver element and described MOS (metal-oxide-semiconductor) transistor.
2. power supply change-over device as claimed in claim 1, wherein said second source converting unit comprises further:
Inductor, is connected between described MOS (metal-oxide-semiconductor) transistor and described output; And
Diode, between the tie point being connected to described inductor and described MOS (metal-oxide-semiconductor) transistor and earth potential,
Output capacitor, is connected between described inductor output and earth potential,
Wherein said inductor, described diode and described capacitor arrangements carry out the electric current that filtering exports from described MOS (metal-oxide-semiconductor) transistor.
3. power supply change-over device as claimed in claim 2, wherein said power conversion unit selected cell comprises further:
Duty ratio detecting unit, is connected with described pwm unit, and configuration detects the duty ratio of the output of described pwm unit;
Drive switch control unit, be connected with described duty ratio detecting unit, and configuration comes to produce control signal based on the output of described duty ratio detecting unit;
Drive switch unit, be connected with described driving switch control unit, and be arranged on described first driver element, between described second driver element and described MOS (metal-oxide-semiconductor) transistor, configuration selects described first power conversion unit and described second source converting unit based on described control signal.
4. power supply change-over device as claimed in claim 3, wherein
If when driving switch control unit to determine that the duty ratio that described duty ratio detecting unit detects is greater than described first threshold, described driving switch control unit controls described driving switch unit and selects described first power conversion unit; And
If when driving switch control unit to determine that the duty ratio that described duty ratio detecting unit detects is less than or equal to described first threshold, described driving switch control unit controls described driving switch unit and selects described second source converting unit,
Wherein said duty ratio corresponds to the ratio of described output voltage and described input voltage.
5. a power conversion unit changing method, is applied to power supply change-over device, and described device comprises input, and configuration is connected with power supply, and receives input voltage; Output, configuration is connected with load, and provides output voltage to described load; Power conversion unit, comprises the first power conversion unit, and described input voltage is converted to described output voltage by configuration, and makes described output voltage stabilization; Second source converting unit, described input voltage is converted to described output voltage by configuration, and make described output voltage stabilization, wherein when the ratio of described output voltage and described input voltage is greater than first threshold, described first power conversion unit has the power supply conversion efficiency higher than described second source converting unit, and described changing method comprises:
Detect the information corresponding with the ratio of described output voltage and described input voltage; And
Based on the first power conversion unit described in the Information Selection corresponding with described ratio and described second source converting unit,
Wherein said power conversion unit comprises:
Feedback unit, is connected with output, and configuration comes to produce feedback voltage based on described output voltage;
Reference voltage generation unit, configuration produces reference voltage;
Error amplifying unit, is connected with described feedback unit and described reference voltage generation unit, and the voltage difference between described feedback voltage and described reference voltage is amplified and produced error amplification signal by configuration;
First driver element, is connected with described error amplifying unit, and described error amplification signal is converted to the first drive singal by configuration;
Triangular wave concussion unit, configuration produces the triangular signal of the voltage with triangle shape;
Pwm unit, shakes unit with described error amplifying unit and described triangular wave and is connected, and configuration produces the pulse signal through pulse width modulation based on described error amplification signal and described triangular signal;
Second driver element, is connected with described pwm unit, and described pulse signal is converted to the second drive singal by configuration; And
MOS (metal-oxide-semiconductor) transistor, be arranged between described input and output, and be connected with the described first or second driver element under the control of described power conversion unit selected cell, configure and regulate based on described first drive singal or described second drive singal the output voltage being supplied to described output
Wherein said first power conversion unit comprises described feedback unit, described reference voltage generation unit, described error amplifying unit, described first driver element and described MOS (metal-oxide-semiconductor) transistor, and second source converting unit comprises described feedback unit, described reference voltage generation unit, described error amplifying unit, the concussion of described triangular wave unit, described pwm unit, described second driver element and described MOS (metal-oxide-semiconductor) transistor.
6. changing method as claimed in claim 5, wherein
The step detecting the information corresponding with the ratio of described output voltage and described input voltage comprises:
Detect the duty ratio of the output of described pwm unit; And
Step based on the first power conversion unit described in the Information Selection corresponding with described ratio and described second source converting unit comprises further:
Output based on described duty ratio detecting unit produces control signal; And
Described first power conversion unit and described second source converting unit is selected based on described control signal.
7. changing method as claimed in claim 6, wherein
If when determining that described duty ratio is greater than described first threshold, then select described first power conversion unit; And
If when determining that described duty ratio is less than or equal to described first threshold, then select described second source converting unit,
Wherein said duty ratio corresponds to the ratio of described output voltage and described input voltage.
8. an electronic equipment, comprising:
Power supply change-over device, comprising:
Input, configuration is connected with power supply, and receives input voltage;
Output, configuration is connected with load, and provides output voltage to described load;
Power conversion unit, comprising:
First power conversion unit, described input voltage is converted to described output voltage by configuration, and makes described output voltage stabilization;
Second source converting unit, described input voltage is converted to described output voltage by configuration, and make described output voltage stabilization, wherein when the ratio of described output voltage and described input voltage is greater than first threshold, described first power conversion unit has the power supply conversion efficiency higher than described second source converting unit;
Power conversion unit selected cell, configuration detects the information corresponding with the ratio of described output voltage and described input voltage, and based on the first power conversion unit described in the Information Selection corresponding with described ratio and described second source converting unit,
Wherein said power conversion unit comprises:
Feedback unit, is connected with output, and configuration comes to produce feedback voltage based on described output voltage;
Reference voltage generation unit, configuration produces reference voltage;
Error amplifying unit, is connected with described feedback unit and described reference voltage generation unit, and the voltage difference between described feedback voltage and described reference voltage is amplified and produced error amplification signal by configuration;
First driver element, is connected with described error amplifying unit, and described error amplification signal is converted to the first drive singal by configuration;
Triangular wave concussion unit, configuration produces the triangular signal of the voltage with triangle shape;
Pwm unit, shakes unit with described error amplifying unit and described triangular wave and is connected, and configuration produces the pulse signal through pulse width modulation based on described error amplification signal and described triangular signal;
Second driver element, is connected with described pwm unit, and described pulse signal is converted to the second drive singal by configuration; And
MOS (metal-oxide-semiconductor) transistor, be arranged between described input and output, and be connected with the described first or second driver element under the control of described power conversion unit selected cell, configure and regulate based on described first drive singal or described second drive singal the output voltage being supplied to described output
Wherein said first power conversion unit comprises described feedback unit, described reference voltage generation unit, described error amplifying unit, described first driver element and described MOS (metal-oxide-semiconductor) transistor, and second source converting unit comprises described feedback unit, described reference voltage generation unit, described error amplifying unit, the concussion of described triangular wave unit, described pwm unit, described second driver element and described MOS (metal-oxide-semiconductor) transistor.
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| CN104660044B (en) * | 2014-12-26 | 2018-07-03 | 西安华为技术有限公司 | A kind of switching circuit, the method and device for controlling switching circuit |
| CN109361312B (en) * | 2018-11-07 | 2021-01-08 | 中新工程技术研究院有限公司 | Method, device, system and computer for reducing electric energy loss of chopper |
| CN112234823B (en) * | 2020-12-09 | 2021-03-16 | 深圳市南方硅谷半导体有限公司 | Low-voltage input and wide-load output linear voltage converter and power supply system |
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| CN1929274A (en) * | 2005-09-09 | 2007-03-14 | 富士通株式会社 | Controller and control method for dc-dc converter |
| CN101499713A (en) * | 2008-01-31 | 2009-08-05 | 珠海全志科技有限公司 | Mixed switch power source converter and automatic switching control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1929274A (en) * | 2005-09-09 | 2007-03-14 | 富士通株式会社 | Controller and control method for dc-dc converter |
| CN101499713A (en) * | 2008-01-31 | 2009-08-05 | 珠海全志科技有限公司 | Mixed switch power source converter and automatic switching control circuit |
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