CN105186872A - Power supply device, power supply system and voltage adjusting method - Google Patents
Power supply device, power supply system and voltage adjusting method Download PDFInfo
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- CN105186872A CN105186872A CN201510487635.3A CN201510487635A CN105186872A CN 105186872 A CN105186872 A CN 105186872A CN 201510487635 A CN201510487635 A CN 201510487635A CN 105186872 A CN105186872 A CN 105186872A
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Abstract
The invention provides a power supply device, a power supply system and a voltage adjusting method. The power supply device comprises a pulse width modulation signal generator, a power conversion circuit, a first error amplifier and a second error amplifier. The pulse width modulation signal generator generates at least one switching signal according to a voltage error signal. The power conversion circuit generates a switching voltage according to the at least one switching signal and sends to an inductor so as to generate a supply voltage. The first error amplifier detects a difference between a positive voltage signal and a reference voltage. An output terminal of the first error amplifier is coupled to a first node. The second error amplifier detects a difference between a negative voltage signal and a grounding voltage. An output terminal of the second error amplifier is coupled to the first node. The voltage error signal is generated on the first node. The pulse width modulation signal generator modulates a working period of the at least one switching signal according to changes of the voltage error signal.
Description
Technical field
The present invention relates to a kind of power supply unit, particularly a kind of power supply unit, it can the voltage drop that causes of the power lead between offset supply supply and load, makes the input voltage of load maintain the level of expectation.
Background technology
Power supply unit provides load, such as motherboard, handheld apparatus etc., required power supply.Power supply unit provides power supply to load by the power lead on printed circuit board (PCB).And these power leads can form equivalent RLC resistance-inductance-capacitance (RLC) circuit.When electric current flows through this RLC equivalent electric circuit, can on power lead, cause a voltage drop, make load-receipt to input voltage can there is error.The electric current flowing through this RLC equivalent electric circuit is larger, and the input voltage of load then has larger error.
Summary of the invention
The invention provides a kind of power supply unit.Power supply unit produces supply power voltage between positive voltage output end and negative voltage output.This power supply unit comprises pulse-width signal generator, circuit for power conversion, the first error amplifier and the second error amplifier.Pulse-width signal generator produces at least one switching signal according to voltage error signal.Circuit for power conversion couples positive voltage output end and negative voltage output, and comprises inductor.Circuit for power conversion produces a switched voltage to inductor, to produce supply voltage between positive voltage output end and negative voltage output according at least switching signal.First error amplifier has the positive input terminal receiving reference voltage and the negative input end receiving positive voltage signal, in order to detect the difference between positive voltage signal and reference voltage.The output of the first error amplifier couples first node.Second error amplifier, has the positive input terminal receiving negative voltage signal and the negative input end receiving earthed voltage, in order to detect the difference between negative voltage signal and earthed voltage.The output of the second error amplifier couples first node.Above-mentioned voltage error signal results from first node.Pulse-width signal generator modulates at least according to the change of voltage error signal that all change the work period of signal.
The present invention also provides a kind of power system, comprises load and power supply unit.Load has positive voltage input and negative voltage input.Power supply unit produces supply power voltage between positive voltage output end and negative voltage output.The positive voltage output end of power supply unit and negative voltage output couple positive voltage input and the negative voltage input of load respectively.This power supply unit comprises pulse-width signal generator, circuit for power conversion, the first error amplifier and the second error amplifier.Pulse-width signal generator produces at least one switching signal according to voltage error signal.Circuit for power conversion couples positive voltage output end and negative voltage output, and comprises inductor.Circuit for power conversion produces a switched voltage to inductor according at least one switching signal, to produce supply voltage between positive voltage output end and negative voltage output.First error amplifier has the positive input terminal receiving reference voltage and the negative input end receiving positive voltage signal, in order to detect the difference between positive voltage signal and reference voltage.Positive voltage signal is associated with the voltage on the positive voltage input of load.The output of the first error amplifier couples first node.Second error amplifier has the positive input terminal receiving negative voltage signal and the negative input end receiving earthed voltage, in order to detect the difference between negative voltage signal and earthed voltage.Negative voltage signal is associated with the voltage on the negative voltage input of load.The output of the second error amplifier couples first node.Voltage error signal results from first node.Pulse-width signal generator modulates at least according to the change of voltage error signal that all change the work period of signal.
The invention provides a kind of voltage adjusting method, in order to adjust the supply voltage that power supply unit produces between positive voltage output end and negative voltage output according at least one switching signal.The positive voltage input of load and negative voltage input couple positive voltage output end and the negative voltage output of power supply unit respectively.This voltage adjusting method comprises the following steps: soft start power supply unit, to produce supply voltage; Judge whether load is underload; When judge load non-for underload time, power supply unit enters continuous conduction mode; Under continuous conduction mode, judge whether that activation far-end detects operation; Be enabled period in far-end detection operation, when voltage on the negative voltage input of load has voltage drop, at least all change the work period of signal in adjustment, use change supply voltage, maintain predetermined level to make the voltage difference between the positive voltage input of load and negative voltage input.
Accompanying drawing explanation
Fig. 1 represents power system according to an embodiment of the invention.
Fig. 2 represents power system according to another embodiment of the present invention.
Fig. 3 A to represent by the parasitic capacitance of power lead cause on the voltage input end of load voltage drop.
Fig. 3 B represents according to the embodiment of the present invention, reacts on the compensation schematic diagram that voltage drop is carried out.
Fig. 4 represents the flow chart of the voltage adjusting method according to the embodiment of the present invention.
Embodiment
For making above-mentioned purpose of the present invention, feature and advantage become apparent, a preferred embodiment cited below particularly, and coordinate accompanying drawing, be described in detail below.
Fig. 1 represents the power system according to the embodiment of the present invention.Consult Fig. 1, the load 11 that power system 1 comprises power supply unit 10 and powered by power supply unit 1.In this embodiment, load 11 can be motherboard, display card, USB, reception and reflector, unlimited power transmission system, handheld apparatus etc.Power supply unit 10 has positive voltage output end VOUTP and negative voltage output VOUTN.Power supply unit 10 produces supply voltage Vsupply between positive voltage output end VOUTP and negative voltage output VOUTN.Load 11 has positive voltage input VINP and negative voltage input VINN.In FIG, power lead 12 and 13 is configured between power supply unit 10 and load 11 and is configured in printed circuit board (PCB) (printedcircuitboard, PCB) on, wherein, power lead 12 is coupled between the positive output end VOUTP of the power supply unit 10 and positive input terminal VINP of load 11, and power lead 13 is coupled between the negative output terminal VOUTP of the power supply unit 10 and negative input end VINN of load 11.Supply voltage Vsupply is sent to load 11 by wire 12 and 13.In FIG, resistor RTSP and the RTSN be represented by dotted lines represents the dead resistance of power lead 12 and 13 respectively.Power supply unit 10 has more positive voltage test side VDETP and negtive voltage detection end VDETN, couple positive voltage input VINP and the negative voltage input VINN of load 11 respectively, in order to detect voltage on positive voltage input VINP and/or negative voltage input VINN to judge whether voltage drop occurs, and adjust supply voltage Vsupply according to judged result, with compensated voltage drop.
Fig. 2 represents the circuit framework of power supply unit 10 and load 11.In fig. 2, represent the equivalent resistance of load 11 with resistor RL, and electric current I LOAD is the electric current flowing through resistor RL.Power supply unit 10 comprises error amplifying circuit 20 and 21, pulse-width signal generator 22, circuit for power conversion 23, decision circuitry 24 and current detection circuit 25.Power supply unit 10 transmits supply voltage Vsupply to load 11 by power lead 12 and 13.Between the positive voltage input VINP of load 11 and negative voltage input VINN, there is capacitor CL, be used for being maintained received supply voltage Vsupply.In power supply unit 10, the voltage divider that error amplifying circuit 20 comprises error amplifier 200 and is made up of resistor RFB1 and RFB2.Resistor RFB1 and the RFB2 of composition voltage divider is series between positive voltage test side VDETP and earthed voltage GND.Voltage on the positive voltage input end VINP of load 11 is sent to positive voltage test side VDETP, and common node N210 by point press operation of resistor RFB1 and RFB2 between resistor RFB1 and RFB2 produces positive voltage signal VFBP.The positive input terminal (+) of error amplifier 200 receives reference voltage VREF, and its negative input end (-) couples common node N200 to receive positive voltage signal VFBP.Error amplifier 200 performs error-detecting operation to detect the difference between positive voltage signal VFBP and reference voltage VFB.The output couple nodes N20 of error amplifier 200.The voltage divider that error amplifying circuit 21 comprises error amplifier 210 and is made up of resistor RFB3 and RFB4.Resistor RFB3 and the RFB4 of composition voltage divider is series between negtive voltage detection end VDETN and earthed voltage GND.Voltage on the negative voltage input VINN of load 11 is sent to negtive voltage detection end VDETN, and common node N210 by point press operation of resistor RFB3 and RFB4 between resistor RFB3 and RFB4 produces negative voltage signal VFBN.The positive input terminal (+) of error amplifier 210 couples common node N210 to receive negative voltage signal VFBN, and its negative input end (-) couples earthed voltage GND.Error amplifier 210 performs error-detecting operation to detect the difference between negative voltage signal VFBN and earthed voltage GND.The output couple nodes N20 of error amplifier 210.Circuit framework according to error amplifying circuit 20 and 21 can be learnt with operation, the level of the voltage error signal VERROR on node N20 can change according to the difference between positive voltage signal VFBP and reference voltage VREF, also can change according to the difference between negative positive voltage signal VFBN and earthed voltage GND.
Pulse-width signal generator 22 comprises comparator 220, trigger 221 and driver 222.Positive input terminal (+) the received current detection signal VCS of comparator 220, and its negative input end (-) receiver voltage error amplification signal VERROR.Comparator 220 produces pulse-width modulation control signal VPWM according to comparative result.Setting end (S) the receive clock signal VCLK of trigger 221, it resets end (R) and receives pulse-width modulation control signal VPWM, and its output (Q) produces drive singal VDRI.Driver 222 receives drive singal VDRI, and produces at least one switching signal according to drive singal VDRI.The circuit framework of the quantity circuit for power conversion 23 of switching signal decides.In the enforcement of Fig. 2, driver 22 produces two switching signal SWH and SWL.
Circuit for power conversion 23 comprises power transistor 230 and 231, inductor L23 and capacitor Cout.In this embodiment, power transistor 230 is with P-type mos (P-typemetalsemiconductor, PMOS) transistor realizes, and power transistor 231 realizes with N-type metal-oxide semiconductor (MOS) (N-typemetalsemiconductor, NMOS) transistor.Power transistor 230 and 231 is series between operating voltage AVDD and earthed voltage GND, and its grid receives switching signal SWH and SWL respectively.Power transistor 230 and 231 operates according to switching signal SWH and SWL, to produce switched voltage SW on common node N23.Inductor L23 is coupled to common node N23 and positive voltage output end VOUTP.Inductor L23 discharge and recharge according to switched voltage SW, to produce supply voltage Vsupply between positive voltage output end VOUTP and negative voltage output VOUTN.Capacitor Cout is coupled between positive voltage output end VOUTP and negative voltage output VOUTN, to be maintained supply voltage Vsupply.
Current detection circuit 25 couples inductor L23 to detect the electric current I L flowing through inductor L23.Current detector 25 comprises electric current addition circuit 250, resistor 251 and slope generating circuit 252.Current detector 25 produces detection current IS ENSE to electric current addition circuit 250 according to the electric current I L flowing through inductor L23.Slope generating circuit 252 produces slope current IRAMP.Electric current addition circuit 250 obtains addition electric current I CS after detection current IS ENSE and slope current IRAMP is carried out addition.This addition electric current I CS flows through resistor 251 generation current detection signal VCS.Therefore can learn, current detection signal VCS can indicate the value of the electric current I L flowing through inductor L23.Current detection signal VCS is then provided to comparator 220, to compare with voltage error signal VERROR.
As mentioned above, power lead 12 and 13 has dead resistance RTSP and RTSN.When a known power supply unit provides supply voltage to load 11 by power lead 12 and 13, due to dead resistance RTSP and the RTSN of power lead 12 and 13, the electric current flowing through dead resistance RTSP or RTSN can cause, on positive voltage input VINP or negative voltage input VINN, voltage drop occurs, and makes the supply voltage generation error received by load 11.In other words, due to the existence of dead resistance RTSP and RTSN, cause load 11 by its positive voltage input VINP and the voltage received by negative voltage input VINN, the difference (vinp-vinn) of the voltage vinn on the voltage vinp namely on positive voltage input VINP and negative voltage input VINN, and between the supply voltage Vsupply that produces of power supply unit 10, there is error.As shown in Figure 3A, when the voltage vinn on negative electricity input VINN voltage drop Vdrop occurs and improves, also there is voltage drop in the voltage (i.e. vinp-vinn) received by load 11, causes load 11 cannot receive correct and suitable voltage.And according to the embodiment of the application, the error amplifier 200 of power supply unit 10 and 201 judge whether voltage drop occurs by detecting the voltage vinp on positive voltage input VINP and the voltage vinn on negative voltage input VINN respectively.When there is voltage drop, power supply unit 10 adjusts supply voltage Vsupply, the error caused with compensated voltage drop by the work period of adjustment switching signal SWH and SWL.Detailed description refers to hereafter.
Consult Fig. 2 and Fig. 3 B, for example, when improving because voltage drop Vdrop occurs the dead resistance RTSN of power lead 13 as the voltage vinn on negative voltage input VINN, on common node N210, negative voltage signal VFBN is also along with raising.Now, error amplifier 210 detects to have difference between switching signal SWH and SWL and earthed voltage GND, and the level of voltage error signal VERROR improves according to the difference between negative voltage signal VFB and earthed voltage GND.Now, by the operation of comparator 220 and trigger 221, increased the work period of switching signal SWH and SWL according to the raising of the level of voltage error signal VERROR.Along with switching signal SWH and the increase of SWL work period, supply voltage Vsupply improves.Now, by the transmission of power lead 12, the voltage vinp on the positive voltage input VINP of load 11 upwards improves.According to above-mentioned, because error amplifier 210 operates by performing error-detecting the difference detected between negative voltage signal VFB and earthed voltage GND, by the operation of pulse-width signal generator 22 and circuit for power conversion 23, the amplitude that voltage vinp is upwards improved equals the voltage drop Vdrop on voltage vinn.Thus, for load 11, it can not be changed along with voltage drop Vdrop by institute positive voltage input VINP and the voltage (vinp-vinn) received by negative voltage input VINN, namely maintains predetermined level.Load then 11 can receive correct and suitable voltage.
According to the embodiment of Fig. 2, voltage vinp on positive voltage input VINP carries out error amplifieroperation again via after resistor RFB1 and RFB2 dividing potential drop, and the voltage vinn on negative voltage input VINN carries out error amplifieroperation again via after resistor RFB3 and RFB4 dividing potential drop.This results in two independently feedback paths.Therefore, resistor RFB1 and RFB2 on a feedback path and not there is between resistor RFB3 and the RFB4 on another feedback path electric current share effect, the resistor that resistor RFB1-RFB4 can be less is realized, the area of power supply unit 10 can be reduced by this.Moreover, because positive voltage input VINP and negative voltage input VINN adopts independently feedback path separately, therefore error amplifying circuit 20 and 21 can react on voltage drop rapidly to modulate the work period of switching signal SWH and SWL, uses and can adjust supply voltage Vsupply in time.
In one embodiment, when under light load conditions, can forbidden energy about the error amplifying circuit 21 of negative voltage input VINN, to increase the service efficiency of power supply unit 10.As shown in Figure 2, the decision circuitry 24 of power supply unit 10 is used for judging whether load 11 is a underload.When decision circuitry 24 judges that load 11 is a underload, produce a disable signal DIS with forbidden energy error amplifier 211, make it not operate.Thus, when load 11 is a underload, only there is error amplifying circuit 20 to operate, the offset voltage of error amplifier 210 can not be increased, the accuracy of error-detecting can be increased.In one embodiment, by according to the electric current I L flowing through inductor L23, decision circuitry 24 can judge whether load 11 is a underload.For example, when the electric current I L flowing through inductor L23 is larger, decision circuitry 24 judges that load 11 is not a underload, is heavy duty.Now, decision circuitry 24 can not produce disable signal DIS, and error amplifier 211 can operate.When the electric current I L flowing through inductor L23 is less, decision circuitry 24 judges that load 11 is underloads.Now, decision circuitry 24 produces disable signal DIS with forbidden energy error amplifier 211.
Fig. 4 represents voltage adjusting method according to an embodiment of the invention.Hereinafter, account for voltage method of adjustment will be carried out by the 2nd and 4 figure.First, judge whether power supply unit 10 is enabled (step S40).When power supply unit 10 is not enabled, then power supply unit 10 inoperation and supply voltage Vsupply (step S41) is not provided.When power supply unit 10 is enabled, then first soft start power supply unit 10 (step S42).When soft start power supply unit 10, first promote towards a predetermined level reference voltage VREF (step S43) giving error amplifier 200 lentamente.When power supply unit 10 is stablized, the level of negative voltage signal VFBN equals the level of reference voltage VREF.Afterwards, decision circuitry 24 is by judging that the electric current I L flowing through inductor L23 is to judge whether load 11 is a underload (step S44).When judging that load 11 is a underload, power supply unit 10 enters discontinuous current mode to produce supply voltage Vsupply (step S45).Under discontinuous current mode, error amplifier 211 is disabled and inoperation, and only error amplifier 210 carries out error-detecting operation to carry out the modulation (step S46) of the work period of switching signal SWH and SWL according to the voltage drop on voltage input end VINP.Now, when voltage on the positive voltage input VINP of load 11 has a voltage drop, the work period of switching signal SWH and SWL is then adjusted according to above-mentioned operation, use adjustment supply voltage Vsupply, maintain predetermined level to make the voltage difference (vinp-vinn) between the positive voltage input VINP of load 11 and negative voltage input VINN.
When judging a load 11 non-underload, power supply unit 10 enters continuous conduction mode supply voltage Vsupply (step S47).Under continuous conduction mode, judge whether that activation far-end detects operation (step S48).When judging that far-end activation operation is not enabled, voltage adjusting method then proceeds to step S46.When judging that far-end activation operation is enabled, not only error amplifier 210 carries out error-detecting operation with the modulation carrying out the work period of switching signal SWH and SWL according to the voltage drop on voltage input end VINP, and error amplifier 211 also carries out error-detecting operation to carry out the modulation (step S49) of the work period of switching signal SWH and SWL according to the voltage drop on voltage input end VINN.Be enabled period in far-end detection operation, when voltage on the positive voltage input VINP of load 11 has a voltage drop, then carry out the work period by adjustment switching signal SWH and SWL according to above-mentioned operation, use adjustment supply voltage Vsupply, maintain predetermined level to make the voltage difference (vinp-vinn) between the positive voltage input VINP of load 11 and negative voltage input VINN.Be enabled period in far-end detection operation, when voltage on the negative voltage input VINN of load 11 has a voltage drop, then carry out the work period by adjustment switching signal SWH and SWL according to above-mentioned operation, use adjustment supply voltage Vsupply, maintain predetermined level to make the voltage difference (vinp-vinn) between the positive voltage input VINP of load 11 and negative voltage input VINN.
Though the present invention with preferred embodiment openly as above; so itself and be not used to limit scope of the present invention; without departing from the spirit and scope of the present invention, when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on appended claims confining spectrum for those skilled in the art.
Claims (13)
1. a power supply unit, to produce supply power voltage between positive voltage output end and negative voltage output, comprising:
Pulse-width signal generator, produces at least one switching signal according to voltage error signal;
Circuit for power conversion, couple this positive voltage output end and this negative voltage output, and comprise inductor, wherein, this circuit for power conversion produces switched voltage to this inductor according to this at least one switching signal, to produce this supply voltage between this positive voltage output end and this negative voltage output;
First error amplifier, have the positive input terminal receiving reference voltage and the negative input end receiving positive voltage signal, in order to detect the difference between this positive voltage signal and this reference voltage, wherein, the output of this first error amplifier couples first node; And
Second error amplifier, have the positive input terminal receiving negative voltage signal and the negative input end receiving earthed voltage, in order to detect the difference between this negative voltage signal and this earthed voltage, wherein, the output of this second error amplifier couples this first node;
Wherein, this voltage error signal results from this first node, and the work period of this at least one switching signal modulated by this pulse-width signal generator according to the change of this voltage error signal.
2. power supply unit as claimed in claim 1, wherein, this pulse-width signal generator comprises:
Comparator, there is the positive input terminal of received current detection signal and couple this first node to receive the negative input end of this voltage error signal, and produce pulse-width modulation control signal according to this voltage error signal and this current detection signal, use the work period of this at least one switching signal of modulation;
Wherein, this current detection signal represents the value of the electric current flowing through this inductor.
3. power supply unit as claimed in claim 2, wherein, this pulse-width signal generator also comprises:
Trigger, the output of the clock end with receive clock signal, the replacement end receiving this pulse-width modulation control signal and generation drive singal; And
Driver, receives this drive singal, and produces this at least one switching signal according to this drive singal.
4. power supply unit as claimed in claim 1, wherein, when the level of this positive voltage signal or this negative voltage signal changes, when the level of this voltage error signal improves, uses the pulse duration increasing this at least one switching signal.
5. power supply unit as claimed in claim 1, also comprises:
According to the electric current flowing through this inductor, decision circuitry, judges whether this supply voltage is provided to underload;
Wherein, when this decision circuitry judges that this supply voltage is provided to this underload, this second error amplifier is disabled and does not operate.
6. a power system, comprising:
Load, has positive voltage input and negative voltage input;
Power supply unit, supply power voltage is produced between positive voltage output end and negative voltage output, wherein, this positive voltage output end of this power supply unit and this negative voltage output couple this positive voltage input and this negative voltage input of this load respectively, and this power supply unit comprises:
Pulse-width signal generator, produces at least one switching signal according to voltage error signal;
Circuit for power conversion, couple this positive voltage output end and this negative voltage output, and comprise inductor, wherein, this circuit for power conversion produces switched voltage to this inductor according to this at least one switching signal, to produce this supply voltage between this positive voltage output end and this negative voltage output;
First error amplifier, there is the positive input terminal receiving reference voltage and the negative input end receiving positive voltage signal, in order to detect the difference between this positive voltage signal and this reference voltage, wherein, this positive voltage signal is associated with the voltage on this positive voltage input of this load, and the output of this first error amplifier couples first node; And
Second error amplifier, there is the positive input terminal receiving negative voltage signal and the negative input end receiving earthed voltage, in order to detect the difference between this negative voltage signal and this earthed voltage, wherein, this negative voltage signal is associated with the voltage on this negative voltage input of this load, and the output of this second error amplifier couples this first node;
Wherein, this voltage error signal results from this first node, and the work period of this at least one switching signal modulated by this pulse-width signal generator according to the change of this voltage error signal.
7. power system as claimed in claim 6, wherein, this pulse-width signal generator comprises:
Comparator, there is the positive input terminal of received current detection signal and couple this first node to receive the negative input end of this voltage error signal, and produce pulsewidth ripple modulator control signal according to this voltage error signal and this current detection signal, use the work period of this at least one switching signal of modulation;
Wherein, this current detection signal represents the value of the electric current flowing through this inductor.
8. power system as claimed in claim 7, wherein, this pulse-width signal generator also comprises:
Trigger, the output of the clock end with receive clock signal, the replacement end receiving this pulse-width modulation control signal and generation drive singal; And
Driver, receives this drive singal, and produces this at least one switching signal according to this drive singal.
9. power system as claimed in claim 6, wherein, when the level of this positive voltage signal or this negative voltage signal changes, when the level of this voltage error signal improves, uses the pulse duration increasing this at least one switching signal.
10. power supply unit as claimed in claim 6, also comprises:
According to the electric current flowing through this inductor, decision circuitry, judges whether this load is underload;
Wherein, when this judges that this load is judged as this underload in road, this second error amplifier is disabled and does not operate.
11. 1 kinds of voltage adjusting methods, in order to adjust the supply voltage that power supply unit produces between positive voltage output end and negative voltage output according at least one switching signal, and the positive voltage input of load and negative voltage input couple this positive voltage output end and this negative voltage output of this power supply unit respectively, this voltage adjusting method comprises:
This power supply unit of soft start, to produce this supply voltage;
Judge whether this load is underload;
When judge this load non-for this underload time, this power supply unit enters continuous conduction mode;
Under this continuous conduction mode, judge whether that activation far-end detects operation;
Be enabled period in this far-end detection operation, when voltage on this negative voltage input of this load has voltage drop, adjust the work period of this at least one switching signal, use and change this supply voltage, maintain predetermined level to make the voltage difference between this positive voltage input of this load and this negative voltage input.
12. voltage adjusting methods as claimed in claim 11, also comprise:
When judging this load for this underload, this power supply unit enters discontinuous conduction mode;
Under this discontinuous conduction mode, when voltage on this positive voltage input of this load has voltage drop, adjust the work period of this at least one switching signal, use and change this supply voltage, maintain this predetermined level to make the voltage difference between this positive voltage input of this load and this negative voltage input.
13. voltage adjusting methods as claimed in claim 11, also comprise:
Under this continuous conduction mode, when voltage on this positive voltage input of this load has voltage drop, adjust the work period of this at least one switching signal, use and change this supply voltage, maintain this predetermined level to make the voltage difference between this positive voltage input of this load and this negative voltage input.
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| CN105186872B (en) | 2018-06-22 |
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