CN103248225A - Power conversion device, switching method of power conversion units and electronic equipment - Google Patents
Power conversion device, switching method of power conversion units and electronic equipment Download PDFInfo
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Abstract
The invention relates to a power conversion device, a switching method of power conversion units and electronic equipment. The power conversion device comprises an input end and an output end, wherein the input end is configured to be connected with a power supply and receives input voltage; the output end is configured to be connected with a load and provides output voltage for the load. The power conversion units comprise a first power conversion unit, a second power conversion unit and a power conversion unit selection unit; the first power conversion unit is configured to convert the input voltage into the output voltage and stabilize the output voltage; the second power conversion unit is configured to convert the input voltage into the output voltage and stabilize the output voltage; when the ratio of the output voltage to the input voltage is larger than a first threshold value, the power conversion efficiency of the first power conversion unit is higher than that of the second power conversion unit; and the power conversion unit selection unit is configured to detect information corresponding to the ratio of the output voltage to the input voltage and selects the first power conversion unit and the second power conversion unit on the basis of the information corresponding to the ratio.
Description
Technical field
The electronic equipment that the present invention relates to the changing method of the power conversion unit in a kind of power supply change-over device, the power supply change-over device and use this power supply change-over device.
Background technology
In the electronic equipment such as mobile phone or panel computer, usually adopting various voltage-dropping type power supply change-over devices is the required voltage of electronic device works with the voltage transitions that battery produces, and battery powers to each parts of electronic equipment by the voltage-dropping type power supply change-over device.
The voltage-dropping type power supply change-over device that adopts in the electronic equipment such as mobile phone or panel computer generally includes linearity (Linear) power conversion unit and copped wave (Buck) power conversion unit.Input voltage at power supply change-over device higher (as, the battery electric quantity of electronic equipment causes the output voltage of battery higher greatly), be the output voltage of power supply change-over device and its input voltage (as, during the output voltage of battery) relatively low, the Buck power conversion unit has good power supply conversion efficiency usually.Yet, input voltage at power supply change-over device lower (as, the battery electric quantity of electronic equipment is low to cause the output voltage of battery to be lower than predetermined threshold), be the output voltage of power supply change-over device and its input voltage (as, during the output voltage of battery) relatively low, the power supply conversion efficiency of Buck power conversion unit can not satisfy the needs of stable output voltage.Here, when the input voltage of the power supply of electronic equipment was low, the power supply conversion efficiency of linear power supply converting unit was 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, provide 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 comprises: first power conversion unit, and configuration is converted to output voltage with input voltage, and makes output voltage stabilization; The second source converting unit, configuration is converted to output voltage with input voltage, and make output voltage stabilization, wherein at the ratio of output voltage and input voltage during greater than first threshold, first power conversion unit has the power supply conversion efficiency higher than second source converting unit; The 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 corresponding with ratio first power conversion unit 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 first power conversion unit, and configuration is converted to output voltage with input voltage, and makes output voltage stabilization; The second source converting unit, configuration is converted to output voltage with input voltage, and make output voltage stabilization, wherein at the ratio of output voltage and input voltage during greater than first threshold, first power conversion unit has the power supply conversion efficiency higher than second source converting unit, and changing method comprises: the information that detection is corresponding with the ratio of output voltage and input voltage; And based on the Information Selection corresponding with ratio first power conversion unit 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 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: first power conversion unit, and configuration is converted to output voltage with input voltage, and makes output voltage stabilization; The second source converting unit, configuration is converted to output voltage with input voltage, and make output voltage stabilization, wherein at the ratio of output voltage and input voltage during greater than first threshold, first power conversion unit has the power supply conversion efficiency higher than second source converting unit; The 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 corresponding with ratio first power conversion unit 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 smaller or equal to first threshold, is then selected the second source converting unit, otherwise select first power conversion unit.In this case, select suitable power conversion unit to come to provide high power supply conversion efficiency under the different situations according to the voltage that offers power supply change-over device, thereby improve the performance of whole electric equipment.
Description of drawings
Fig. 1 is that diagram is according to the block diagram of the power supply change-over device of the embodiment of the invention;
Fig. 2 is that diagram is according to the schematic block diagram of the structure of each parts of the power supply change-over device of the embodiment of the invention; And
Fig. 3 is that diagram is according to the flow chart of the changing method of the power conversion unit of the embodiment of the invention.
Embodiment
Describe in detail with reference to the accompanying drawings according to each embodiment of the present invention.Here, it should be noted that in the accompanying drawings, identical Reference numeral is given had part identical or similar structures and function basically, and will omit being repeated in this description about them.
Power supply change-over device according to the embodiment of the invention will briefly be described below.Fig. 1 is that diagram is according to the block diagram of the power supply change-over device of the embodiment of the invention.As shown in Figure 1, the power supply change-over device that adopts in the electronic equipment such as mobile phone, notebook computer or panel computer 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 (as, battery), and is used 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 each parts of electronic equipment) to these loads.
In addition, the linearity in the power conversion unit 3 (Linear) power conversion unit 31 can be arranged between input 1 and the 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.Copped wave in the power conversion unit 3 (Buck) power conversion unit 32 can be arranged between input 1 and the 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, input voltage at 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, when the ratio output voltage of battery) was low, the Buck power conversion unit had good power supply conversion efficiency usually.Yet, input voltage at input 1 lower (as, the battery electric quantity of electronic equipment is low to cause the output voltage of battery to be lower than specific threshold), be the output voltage of power supply change-over device and its input voltage (as, during the output voltage of battery) relatively low, 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 ratio of the output voltage of power supply change-over device and input voltage, and based on the Information Selection Linear power conversion unit corresponding with ratio and Buck power conversion unit.For example, when the output voltage of power supply change-over device and the ratio between the input voltage are higher than predetermined threshold value, power conversion unit selected cell 4 can be selected Linear power conversion unit 31, otherwise power conversion unit selected cell 4 can be selected Buck power conversion unit 32.Here, predetermined threshold can be determined based on the power supply conversion efficiency when different inputs, the 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 the 26S Proteasome Structure and Function of Fig. 2 description according to each parts of the power supply change-over device of the embodiment of the invention.Fig. 2 is that diagram is according to the schematic block diagram of the structure of each parts of the power supply change-over device of the embodiment of the invention.
As shown in Figure 2, the power supply change-over device according to the embodiment of the invention can comprise 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, drive switch control unit 401 and drive switch unit 402.Here, Linear power conversion unit 31 shown in Figure 1 comprises feedback unit 300, reference voltage generation unit 301, error amplifying unit 302, driver element 303 and metal-oxide-semiconductor 307, and the 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 function and the structure of Linear power conversion unit 31 and Buck power conversion unit 32 are 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 reference voltage generation unit 301 with feedback unit 300, 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 amplifying 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 driving signal for driven MOS pipe 307.Here, according to another embodiment of the invention, enough under the big situation, can directly utilize the error amplification signal of error amplifier 302 as driving signal (namely need not to arrange driver element 303) at the error amplification signal of error amplifying unit 302.
Metal-oxide-semiconductor 307 is arranged between input 1 and the output 2, and can be connected with driver element 303.When metal-oxide-semiconductor 307 was connected with driver element 303, metal-oxide-semiconductor 307 can be based on the output voltage of the driving Signal Regulation output 2 of driver element 303, and makes 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 triangular wave shape.
Pulse width modulation (PWM) unit 305 is connected with triangular wave concussion unit 304 with error amplifying unit 302, 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 the result produces pulse signal through pulse width modulation based on the comparison.For example, when the level of error amplification signal is higher than the level of triangular signal, pwm unit 305 can be exported high level signal, and when the level of error amplification signal was lower than the level of triangular signal, pwm unit 305 can the output low level signal.Therefore, if because the variation of the load of electronic equipment causes the level of error amplification signal to change, the duty ratio of the output of pwm unit 305 (pulse-modulated signal) (time in the time/high level of high level and a low level whole cycle) also can change.Here, the pulse-modulated signal of pwm unit 305 has the shape of square wave.
Here, feedback unit 300, reference voltage generation unit 301, error amplifying unit 302, driver element 303 and metal-oxide-semiconductor 307 can be formed Linear power conversion unit 31 shown in Figure 1.In this case, if the load of Linear power conversion unit 31 change (as, electronic equipment standby or operating state etc.), then the output voltage at output 2 also can change, thereby causes the feedback voltage of feedback unit 300 to change.Here, because the difference that error amplifying unit 302 amplifies reference voltage and feedback voltage, therefore the output of error amplifying unit 302 also can change, cause the variation of the driving signal of driver element 303 outputs thus, the variation that drives signal then causes the variation of the output current of metal-oxide-semiconductor 307, thereby can regulate the output voltage of output 2 so that it keeps substantially constant.
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 be formed Buck power conversion unit shown in Figure 1.In this case, if the load of Buck power conversion unit 32 change (as, electronic equipment standby or operating state etc.), then the output voltage at output 2 also can change, thereby causes the feedback voltage of feedback unit 300 to change.Here, because the difference that error amplifying unit 302 amplifies reference voltage and feedback voltage, so 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, cause the duty ratio of the driving signal of driver element 306 also correspondingly to change thus, thereby corresponding the variation takes place in the on/off time that makes metal-oxide-semiconductor 307, thereby can make the output voltage of output 2 keep substantially constant based on driving signal.
In addition, because the output voltage of Buck power conversion unit 32 has impulse waveform (by having the drive metal-oxide-semiconductor 307 of impulse waveform), so 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 the output 2, and diode 309 is connected between the tie point and earth potential (Ground) of inductor 308 and metal-oxide-semiconductor 307, and output capacitor 310 is connected between the output and earth potential of inductor 308.Inductor 308, diode 309 and output capacitor 310 are formed and are used for filtering from the voltage/current of metal-oxide-semiconductor 307 outputs and make the voltage/current of filtering become the filter unit of the operable VD/electric current of load of electronic equipment.Here, because function and the structure of the filter unit that inductor 308, diode 309 and capacitor 310 are formed are known to those skilled in the art, therefore omitted the detailed description about them here.
Here, because Linear power conversion unit 31 has identical 26S Proteasome Structure and Function with subelement in the Buck power conversion unit 32, therefore by make Linear power conversion unit 31 and Buck power conversion unit 32 shared portion elements (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 that comprises 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 have been formed power conversion unit selected cell 4 shown in Figure 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 duty detection circuit arbitrarily, 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 and be connected with duty ratio detecting unit 400, and can produce control signal based on the output (duty ratio detection signal) with duty ratio detecting unit 400.Drive switch unit 402 and be connected with driving switch control unit 401, and be arranged between driver element 303, driver element 306 and the metal-oxide-semiconductor 307.Driving switch unit 402 can be electronic switch, and can one of driver element 303, driver element 306 be connected with metal-oxide-semiconductor 307 based on the control signal that driving switch control unit 401 provides, thereby can select Linear power conversion unit 31 and Buck power conversion unit 32.
Particularly, driving switch control unit 401 receives the duty ratio detection signals and obtains the duty ratio of the pulse signal of pwm unit 305 based on this signal from duty ratio detecting unit 400.Here, because the pulse signal of pwm unit 305 is used for the on/off of control metal-oxide-semiconductor 307, and the ratio of the voltage between the two ends of metal-oxide-semiconductor 307 is by the ratio decision in turn-on time and the whole cycle of metal-oxide-semiconductor 307, so the ratio between the input voltage of the output voltage of output 2 and input 1 equals the duty ratio of the pulse signal of pwm unit 305.Then, drive switch control unit 401 duty ratio and the preset threshold value that obtains compared, and the result produces control signal to select Linear power conversion unit and Buck power conversion unit based on the control signal that is produced based on the comparison.As description before, preset threshold value is represented the threshold value of the ratio between output voltage and the input voltage, and predetermined threshold can be determined based on the power supply conversion efficiency when different inputs, the output voltage ratio of Linear power conversion unit and Buck power conversion unit, and can be experiment value or empirical value.In this case, during greater than this predetermined threshold value, Linear power conversion unit 31 has better power supply conversion efficiency in duty ratio.In this case, determine duty ratio detecting unit 400 detected duty ratios greater than predetermined threshold value if drive switch control unit 401, drive switch control unit 401 control driving switch units 402 and select the Linear power conversion unit.Particularly, drive switch control unit 401 and can send control signals to driving switch unit 402, make that driving switch unit 402 is connected to select Linear power conversion unit 31 with driver element 303 with metal-oxide-semiconductor 307.In addition, determine that duty ratio detecting unit 400 detected duty ratios are less than or equal to predetermined threshold value if drive switch control unit 401, drive switch control unit 401 control driving switch units 402 and select Buck power conversion unit 32.Particularly, drive switch control unit 401 and can send control signals to driving switch unit 402, make that driving switch unit 402 is connected to select Buck power conversion unit 32 with driver element 306 with metal-oxide-semiconductor 307.
Described in the above according to exemplary embodiment of the present invention, yet, the invention is not restricted to this.For example, power conversion unit selected cell 4 can directly detect the input voltage of input 1 and the output voltage of output 2, and calculates the ratio of output voltage and input voltage.After the ratio that obtains output voltage and input voltage, driving switch control unit 401 in the power conversion unit selected cell 4 compares this ratio and predetermined threshold, and the result controls driving switch unit 402 selection Buck power conversion unit 32 or Linear power conversion units 31 based on the comparison.In addition, can also only detect the input voltage of input 1, and drive switch unit 402 by control at input voltage during less than a threshold value and select Linear power conversion units 31, perhaps drive switch unit 402 by control at input voltage during more than or equal to this threshold value and select Buck power conversion units 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 smaller or equal to predetermined threshold value, is then selected Buck power conversion unit 32, otherwise select Linear power conversion unit 31.In this case, select suitable power conversion unit to come to provide high power supply conversion efficiency under the different situations according to the voltage that offers power supply change-over device, thereby improve the performance of whole electric equipment.For example, under the situation of the electric weight deficiency of the battery of electronic equipment, carry out the power supplys conversion by Linear power conversion unit 31, and under the situation in the electric weight abundance of the battery of electronic equipment, carry out the power supplys conversion by Buck power conversion unit 31.
Power supply change-over device according to the embodiment of the invention has been described, below with reference to the power conversion unit changing method of Fig. 3 description according to the embodiment of the invention in the above.Power conversion unit changing method according to the embodiment of the invention can be applied in the power supply change-over device as illustrated in figs. 1 and 2.Here, owing in the above power supply change-over device is described in detail, therefore only it is simply described here.Power supply change-over device according to the embodiment of the invention comprises input 1, and 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 used for input voltage and is converted to output voltage and makes output voltage stabilization; Buck power conversion unit 32, be used for input voltage and be converted to output voltage and output voltage stabilization, wherein at the ratio of output voltage and input voltage during greater than predetermined threshold value, the 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 with output and can produces feedback voltage based on output voltage; Reference voltage generation unit 301 is for generation of reference voltage; Error amplifying unit 302 is connected with reference voltage generation unit 301 with feedback unit 300, and the voltage difference between feedback voltage and the reference voltage can be amplified and produce error amplification signal; Driver element 303 is connected with error amplifying unit 302, and is converted to the driving signal for error amplification signal; Triangular wave concussion unit 304 is for generation of the triangular signal of the voltage with triangular wave shape; Pwm unit 305 is connected with triangular wave concussion unit 304 with error amplifying unit 302, and can produces the pulse signal of process 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 the driving signal; And metal-oxide-semiconductor 307, be arranged between input 1 and the output 2, metal-oxide-semiconductor 307 can be connected with driver element 303 or driver element 306, and can be based on the output voltage of the driving Signal Regulation output 2 of the driving signal of driver element 303 or driver element 306.Here Linear power conversion unit 31 shown in Figure 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, at step S301, the information that detection is corresponding with the ratio of output voltage and input voltage.
Particularly, as described at Fig. 2, duty ratio detecting unit 400 detects the duty ratio of the output of pwm unit 305, and the output 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 used for the on/off of control metal-oxide-semiconductor 307, and the ratio of the voltage between the two ends of metal-oxide-semiconductor 307 is determined by the ratio (corresponding to duty ratio) in turn-on time and the whole cycle of metal-oxide-semiconductor 307, so the ratio between the input voltage of the output voltage of output 2 and input 1 equals the duty ratio of the pulse signal of pwm unit 305.
In addition, according to another embodiment of the invention, power conversion unit selected cell 4 can also directly detect the input voltage of input 1 and the output voltage of output 2, and calculates the ratio of output voltage and input voltage.In addition, because the output voltage of output 2 is constant substantially, therefore can also only detect the input voltage of input 1 with the acquisition information relevant with the ratio of output voltage and input voltage.
Then, at step S302, based on the Information Selection Linear power conversion unit corresponding with ratio and Buck power conversion unit.
Particularly, driving switch control unit 401 receives the duty ratio detection signals and obtains the duty ratio of the pulse signal of pwm unit 305 based on this signal from duty ratio detecting unit 400.Then, drive switch control unit 401 duty ratio and the preset threshold value that obtains compared, and the result produces control signal to select Linear power conversion unit and Buck power conversion unit based on the control signal that is produced based on the comparison.Here, during greater than this predetermined threshold value, Linear power conversion unit 31 has better power supply conversion efficiency in duty ratio.In this case, determine duty ratio detecting unit 400 detected duty ratios greater than predetermined threshold value if drive switch control unit 401, drive switch control unit 401 control driving switch units 402 and select the Linear power conversion unit.Particularly, drive switch control unit 401 and send control signals to driving switch unit 402, make that driving switch unit 402 is connected to select Linear power conversion unit 31 with driver element 303 with metal-oxide-semiconductor 307.In addition, determine that duty ratio detecting unit 400 detected duty ratios are less than or equal to predetermined threshold value if drive switch control unit 401, drive switch control unit 401 control driving switch units 402 and select Buck power conversion unit 32.Particularly, drive switch control unit 401 and send control signals to driving switch unit 402, make that driving switch unit 402 is connected to select Buck power conversion unit 32 with driver element 306 with metal-oxide-semiconductor 307.
In addition, according to another embodiment of the invention, the output voltage of the input voltage that directly detects input 1 and output 2 and calculate output voltage and the situation of the ratio of input voltage under, drive switch control unit 401 ratio and the preset threshold value that obtains compared, and the result produces control signal to select Linear power conversion unit and Buck power conversion unit based on the control signal that is produced based on the comparison.In addition, under the situation of the input voltage that only detects input 1, drive switch control unit 401 input voltage and the voltage threshold of presetting are compared, and the result produces control signal to select Linear power conversion unit and Buck power conversion unit based on the control signal that is produced based on the comparison.
Power supply change-over device and the applied power conversion unit changing method of power supply change-over device have according to an exemplary embodiment of the present invention been described in the above.Can be applied on the electronic equipment such as smart mobile phone, panel computer or notebook computer according to power supply change-over device of the present invention.In this case, the power supply change-over device that the electronic equipment such as smart mobile phone, panel computer or notebook computer can be 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 comprises: the Linear power conversion unit, and configuration is converted to output voltage with input voltage, and makes output voltage stabilization; The Buck power conversion unit, configuration is converted to output voltage with input voltage, and make output voltage stabilization, wherein at the ratio of output voltage and input voltage during greater than predetermined threshold value, the Linear power conversion unit has the power supply conversion efficiency higher than Buck power conversion unit; The 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.
Describe each embodiment of the present invention in the above in detail.Yet, it should be appreciated by those skilled in the art that without departing from the principles and spirit of the present invention, can carry out various modifications to these embodiment, combination or sub-portfolio, and such modification should fall within the scope of the present invention.
Claims (10)
1. power supply change-over device comprises:
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 comprises:
First power conversion unit, configuration is converted to described output voltage with described input voltage, and makes described output voltage stabilization;
The second source converting unit, configuration is converted to described output voltage with described input voltage, and make described output voltage stabilization, wherein at the ratio of described output voltage and described input voltage during greater than first threshold, described first power conversion unit has than the higher power supply conversion efficiency of described second source converting unit;
The power conversion unit selected cell, configuration detects the information corresponding with the ratio of described output voltage and described input voltage, and based on described first power conversion unit of the Information Selection corresponding with described ratio and described second source converting unit.
2. power supply change-over device as claimed in claim 1, wherein said power conversion unit comprises:
Feedback unit is connected with output, and configuration comes to produce feedback voltage based on described output voltage;
The reference voltage generation unit, configuration produces reference voltage;
The error amplifying unit is connected with described reference voltage generation unit with described feedback unit, and configuration is amplified the voltage difference between described feedback voltage and the described reference voltage and the generation error amplification signal;
First driver element is connected with described error amplifying unit, and configuration is converted to the first driving signal with described error amplification signal;
Triangular wave concussion unit, configuration produces the triangular signal of the voltage with triangular wave shape;
Pwm unit be connected with described triangular wave concussion unit with described error amplifying unit, and configuration is come to produce the pulse signal of process pulse width modulation based on described error amplification signal and described triangular signal;
Second driver element is connected with described pwm unit, and configuration is converted to the second driving signal with described pulse signal; And
MOS (metal-oxide-semiconductor) transistor, be arranged between described input and the output, and under the control of described power conversion unit selected cell, be connected with described first or second driver element, configuration comes to drive signal or described second based on described first and drives the output voltage that Signal Regulation offers 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 the second source converting unit comprises described feedback unit, described reference voltage generation unit, described error amplifying unit, described triangular wave concussion unit, described pwm unit, described second driver element and described MOS (metal-oxide-semiconductor) transistor.
3. power supply change-over device as claimed in claim 2, wherein said second source converting unit further comprises:
Inductor is connected between described MOS (metal-oxide-semiconductor) transistor and the described output; And
Diode is connected between the tie point and earth potential of described inductor and described MOS (metal-oxide-semiconductor) transistor,
Output capacitor is connected between described inductor output and the earth potential,
Wherein said inductor, described diode and described capacitor arrangements come filtering from the electric current of described MOS (metal-oxide-semiconductor) transistor output.
4. power supply change-over device as claimed in claim 3, wherein said power conversion unit selected cell further comprises:
The 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 between described first driver element, described second driver element and the described MOS (metal-oxide-semiconductor) transistor, configuration is selected described first power conversion unit and described second source converting unit based on described control signal.
5. power supply change-over device as claimed in claim 4, wherein
If when the driving switch control unit was determined the detected duty ratio of described duty ratio detecting unit greater than described first threshold, described driving switch control unit was controlled described driving switch unit and is selected described first power conversion unit; And
If when driving switch control unit and determining that the detected duty ratio of described duty ratio detecting unit is less than or equal to described first threshold, described driving switch control unit is controlled described driving switch unit and is selected described second source converting unit,
Wherein said duty ratio is corresponding to the ratio of described output voltage and described input voltage.
6. 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 first power conversion unit, and configuration is converted to described output voltage with described input voltage, and makes described output voltage stabilization; The second source converting unit, configuration is converted to described output voltage with described input voltage, and make described output voltage stabilization, wherein at the ratio of described output voltage and described input voltage during greater than first threshold, described first power conversion unit has than the higher power supply conversion efficiency of 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 described first power conversion unit of the Information Selection corresponding with described ratio and described second source converting unit.
7. changing method as claimed in claim 6, wherein said power conversion unit comprises:
Feedback unit is connected with output, and configuration comes to produce feedback voltage based on described output voltage;
The reference voltage generation unit, configuration produces reference voltage;
The error amplifying unit is connected with described reference voltage generation unit with described feedback unit, and configuration is amplified the voltage difference between described feedback voltage and the described reference voltage and the generation error amplification signal;
First driver element is connected with described error amplifying unit, and configuration is converted to the first driving signal with described error amplification signal;
Triangular wave concussion unit, configuration produces the triangular signal of the voltage with triangular wave shape;
Pwm unit be connected with described triangular wave concussion unit with described error amplifying unit, and configuration is come to produce the pulse signal of process pulse width modulation based on described error amplification signal and described triangular signal;
Second driver element is connected with described pwm unit, and configuration is converted to the second driving signal with described pulse signal; And
MOS (metal-oxide-semiconductor) transistor, be arranged between described input and the output, and under the control of described power conversion unit selected cell, be connected with described first or second driver element, configuration comes to drive signal or described second based on described first and drives the output voltage that Signal Regulation offers 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 the second source converting unit comprises described feedback unit, described reference voltage generation unit, described error amplifying unit, described triangular wave concussion unit, described pwm unit, described second driver element and described MOS (metal-oxide-semiconductor) transistor.
8. changing method as claimed in claim 7, wherein
The step that detects 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 described first power conversion unit of the Information Selection corresponding with described ratio and described second source converting unit further comprises:
Output based on described duty ratio detecting unit produces control signal; And
Select described first power conversion unit and described second source converting unit based on described control signal.
9. changing method as claimed in claim 8, wherein
If when determining described duty ratio 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 is corresponding to the ratio of described output voltage and described input voltage.
10. electronic equipment comprises:
Power supply change-over device comprises:
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 comprises:
First power conversion unit, configuration is converted to described output voltage with described input voltage, and makes described output voltage stabilization;
The second source converting unit, configuration is converted to described output voltage with described input voltage, and make described output voltage stabilization, wherein at the ratio of described output voltage and described input voltage during greater than first threshold, described first power conversion unit has than the higher power supply conversion efficiency of described second source converting unit;
The power conversion unit selected cell, configuration detects the information corresponding with the ratio of described output voltage and described input voltage, and based on described first power conversion unit of the Information Selection corresponding with described ratio and described second source converting unit.
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| CN104660044A (en) * | 2014-12-26 | 2015-05-27 | 西安华为技术有限公司 | Switching circuit and method and device for controlling switching circuit |
| CN109361312A (en) * | 2018-11-07 | 2019-02-19 | 中新工程技术研究院有限公司 | A kind of method, apparatus, system and computer reducing chopper electric energy loss |
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| CN104660044A (en) * | 2014-12-26 | 2015-05-27 | 西安华为技术有限公司 | Switching circuit and method and device for controlling switching circuit |
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| CN112234823A (en) * | 2020-12-09 | 2021-01-15 | 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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| CN103248225B (en) | 2016-03-02 |
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