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CN101895209A - Power supply circuit and method thereof - Google Patents

Power supply circuit and method thereof Download PDF

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Publication number
CN101895209A
CN101895209A CN2009101454138A CN200910145413A CN101895209A CN 101895209 A CN101895209 A CN 101895209A CN 2009101454138 A CN2009101454138 A CN 2009101454138A CN 200910145413 A CN200910145413 A CN 200910145413A CN 101895209 A CN101895209 A CN 101895209A
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power supply
voltage
circuit
supply circuit
loop
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CN101895209B (en
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吴忠文
涂建成
林文轩
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Novatek Microelectronics Corp
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Novatek Microelectronics Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The invention is a power supply circuit and its method, in the normal mode, feedback the power with the closed loop; in the power saving mode, the power is fed back by an open loop. When the power feedback is detected to be continuously in the open loop and is substantially in the zero output state, the power supply circuit enters a power down state. If the back-end circuit needs power again, the feedback is switched back to the closed loop, so that the power supply circuit returns to normal operation.

Description

Power supply circuit and its method
Technical field
The relevant a kind of power supply circuit of the present invention, and particularly relevant a kind of high efficiency power supply circuit.
Background technology
Display unit such as display or television set has become the article that modern people life can not be perhaps.Display can show computer data as the screen of PC.See that TV then is one of people's amusement.
Along with the new line of environmental consciousness, electronic installation the more has electricity-saving function.Yet, when traditional electronic devices enters battery saving mode, may be still in running order than the switching power circuit (switching power circuit) of power consumption, so its province's electrical efficiency is limited.
Summary of the invention
The purpose of this invention is to provide a kind of power supply circuit and method, wherein, under battery saving mode, power supply is fed back to out the loop; Under normal mode, power supply is fed back to the loop circuit.When detecting power supply feedback and continue to be in out the loop, and essence is in the zero output state, and then power supply circuit enters power-off (power down) state.
Another object of the present invention provides a kind of power supply circuit and method, and wherein, if back-end circuit needs power supply once again, then feedback switches back to the loop circuit, makes power supply circuit reply regular event.
According to an aspect of the present invention, propose a kind of power supply circuit, provide a supply voltage to a back-end circuit.This power supply circuit comprises: a switching power circuit, control this supply voltage; One loop circuit FEEDBACK CONTROL, under a normal mode, this loop circuit FEEDBACK CONTROL is fed back this supply voltage to this switching power circuit with a loop circuit; And one open circuit feedback control, and under a battery saving mode, this is opened circuit feedback control and opens this supply voltage of circuit feedback to this switching power circuit with one.When this switching power circuit continued to detect this and opens loop and this switching power circuit and be in an essence zero output state, this switching power circuit entered a " shut " mode".
According to a further aspect in the invention, propose a kind of power supply method, provide a supply voltage to a back-end circuit.This power supply method comprises: under a normal mode, feed back this supply voltage with a loop circuit; Under a battery saving mode, open this supply voltage of circuit feedback with one; And wherein ought continue to detect this and open the loop, enter a " shut " mode".
Description of drawings
For foregoing of the present invention can be become apparent, below conjunction with figs. is elaborated to preferred embodiment of the present invention, wherein:
Fig. 1 shows the lower wattage power supply supply circuit according to the embodiment of the invention.
Fig. 2 shows according to loop circuit FEEDBACK CONTROL in the lower wattage power supply supply circuit of the embodiment of the invention and the detailed circuit diagram of opening circuit feedback control.
Fig. 3 shows the circuit diagram according to the switching power circuit of the embodiment of the invention.
Signal waveforms in Fig. 4 displayed map 3.
Fig. 5 shows the digital delay loop according to the embodiment of the invention.
Embodiment
In embodiments of the present invention, under battery saving mode, power supply is fed back to out the loop; During regular event, power supply is fed back to the loop circuit.Therefore, when detecting power supply feedback and continue to be in out the loop, and switching power circuit is in the zero output state, and then switching power circuit will enter power-off (power down) state.If back-end circuit needs power supply once again, then feed back to and cut to the loop circuit, make power supply circuit can reply regular event.
Fig. 1 shows the lower wattage power supply supply circuit according to the embodiment of the invention.The lower wattage power supply supply circuit is installed in the electronic installation, as display, lcd screen etc.As shown in Figure 1, lower wattage power supply supply circuit 100 comprises: filter 110, rectifier 120, transformer 130, switching power circuit 140, loop circuit FEEDBACK CONTROL 150, open circuit feedback control 160, capacitor C 1～C2 and diode D1～D2.Lower wattage power supply supply circuit 100 converts voltage source AC_in to direct voltage source, to be supplied to back-end circuit 191.Voltage source AC_in is such as the civil power that is 110V.
190 in small voltage source can be with selectivity direct voltage source in the electronic installation (such as DVI, VGA) etc. by being supplied to back-end circuit 191 after diode D3 and the D4 rectification.But, the supply of current in small voltage source 190 is lower, and the selectivity direct voltage source not necessarily exists.
Filter 110 is in order to carry out filtering to voltage source AC_in.Filter 110 is such as being the electromagnetic interference (EMI) filter.The output voltage of filter 110 is to input to rectifier 120.Rectifier 120 is rectified into direct voltage with the output voltage of filter 110.Rectifier 120 is such as being bridge rectifier.
According to the voltage that is fed back by loop circuit FEEDBACK CONTROL 150, switching power circuit 140 output control voltage V2.This control voltage V2 inputs to the primary side (primary side) of transformer 130.By the coupling of transformer 130, this control voltage V2 is coupled to the primary side (secondary side) of transformer 130.The coupling of switching power circuit 140 control transformers 130; In detail, when the output duty cycle of switching power circuit 140 is healed when big, during the coupling of transformer 130 more for a long time; Vice versa.In addition, when the output duty cycle of switching power circuit 140 was 0, transformer 130 can not be coupled, further to reduce magnetic loss.
Diode D1 and D2 are with the primary side output voltage rectification of transformer 130, to be supplied to back-end circuit 191.Back-end circuit 191 is such as convergent-divergent circuit (scaler) etc.In addition, for more one advancing to reach voltage stabilizing, between back-end circuit 191 and diode D2, can also comprise low dropout voltage regulator (LDO (Low Drop Out) regulator).
Loop circuit FEEDBACK CONTROL 150 feeds back to switching power circuit 140 with direct voltage V3 with loop circuit (close loop).Just, switching power circuit 140 can produce the PWM output signal according to the output voltage V 1 of loop circuit FEEDBACK CONTROL 150, and this PWM output signal can controlled the level of controlling voltage V2.When lower wattage power supply supply circuit 100 was in normal running, loop circuit FEEDBACK CONTROL 150 can be in the loop circuit state, so that voltage V3 is fed back to switching power circuit 140.So, but the load variations of lower wattage power supply supply circuit 100 fast reaction back-end circuit 191.Such as, when load was big, the work period of the PWM output signal that switching power circuit 140 is produced (duty cycle) was big; Vice versa.
When entering battery saving mode, hold circuit feedback control 160 and can formation hold the loop and make the loop circuit to form.So, will make voltage V3 to feed back to switching power circuit 140, and under certain condition, switching power circuit 140 can enter " shut " mode", with further power saving by loop circuit FEEDBACK CONTROL 150.Because switching power circuit 140 enters " shut " mode", transformer 130 does not carry out the energy coupling, so transformer 130 can not transmit its energy to capacitor C 2.Because this moment, electric charge can't continue to accumulate in the capacitor C 2, the electric charge in being stored in capacitor C 2 is consumed (such as being consumed by the assembly in the loop circuit FEEDBACK CONTROL 150), and voltage V3 will reduce.If voltage V3 is too low, will causes switching power circuit 140 to be reset, and cause the misoperation of circuit.So in the present embodiment, if during voltage V3 subcritical value, switching power circuit 140 can return back to normal condition by " shut " mode".By allowing switch power circuit 140 switch between " shut " mode" and the normal manipulation mode, can reach the power consumption of saving switching power circuit 140.
Fig. 2 shows according to loop circuit FEEDBACK CONTROL in the lower wattage power supply supply circuit 100 of the embodiment of the invention 150 and the detailed circuit diagram of opening circuit feedback control 160.As shown in Figure 2, loop circuit FEEDBACK CONTROL 150 comprises: optically coupled circuit 151, Voltage Reference controller 152 and resistance R 1.Voltage Reference controller 152 comprises diode D5, resistance R 2 and R3.Open circuit feedback control 160 and comprise transistor Q1, resistance R 4 and R5.
Under normal mode, transistor Q1 is for closing, and voltage feedback paths is optically coupled circuit 151 and Voltage Reference controller 152 (the loop circuit feedback forms), makes voltage V3 feed back to primary side by the primary side of transformer 130.On the contrary, when being under the battery saving mode, transistor Q1 is conducting, and Voltage Reference controller 152 is activated; Because voltage V4 is clamped down on by transistor Q1, so the loop circuit feedback can't form.Open circuit feedback control 160 and will inhale (sink) electric current (electric current is provided by Voltage Reference controller 152), and can not give Voltage Reference controller 152 by output current.At this moment, when being under the battery saving mode, because the output duty cycle of switching power circuit 140 can reduce (even being 0), voltage V3 can slowly fall down, because resistance R 2 consumes the electric charge that is stored in the capacitor C 2 with R3.In addition, Voltage Reference controller 152 can allow voltage V3 voltage stabilizing; And when opening loop when existing when not existing (that is loop circuit), Voltage Reference controller 152 can't normal running.
Fig. 3 shows the circuit diagram according to the switching power circuit 140 of the embodiment of the invention.As shown in Figure 3, switching power circuit 140 comprises: PWM produces circuit 310, comparator 320, postpones loop (delay loop) 330, comparator 340 and capacitor C 4.Comparator 320, delay loop 330 form pwm control circuits with comparator 340, produce circuit 310 with control PWM and whether enter " shut " mode".In detail, under power down mode, and the PWM output duty cycle that produces circuit 310 is lower than a critical point or be 0% o'clock, and then PWM produces circuit 310 and enters " shut " mode", to save power consumption.
The output duty cycle of PWM generation circuit 310 (that is, the work period of its output signal OUT) relevant for voltage V1.The framework that PWM produces circuit 310 does not need special qualification at this.PWM produces circuit 310 and also comprises an oscillating circuit (oscillator) (not being shown among the figure).
Comparator 320 comparative voltage V1 and reference voltage V DET1Such as, when voltage V1 is higher than reference voltage V DET1, the output signal of comparator 320 is a low logic state, vice versa.
Postpone loop 330 and comprise current source 331 and capacitor C 4.When comparator 320 was exported the signal of high logic states, 331 output charges of current source can accumulate in the capacitor C 4, make the voltage of node N1 rise gradually.When comparator 320 was exported the signal of low logic states, the electric charges that accumulate in the capacitor C 4 can discharge by the internal discharge path of comparator 320, make the voltage of node N1 reduce to 0.
When the load variations of back-end circuit 191 is very big, may make voltage V1 low excessively, in this case, can not make switching power circuit 140 enter " shut " mode", produce otherwise have misoperation.In the present embodiment, preferably under battery saving mode, just make switching power circuit 140 enter " shut " mode".Postponing loop 330 and can avoid generation of false action with comparator 340, is to make switching power circuit 140 enter " shut " mode" mistakenly in this so-called misoperation.That is in the present embodiment, when the work period of the output signal OUT that enters battery saving mode and switching power circuit 140 was 0, postponing loop 330 can enter " shut " mode" with control switching circuit 140 with just output behind this condition delay.In more detail, be 0 when the work period of the output signal OUT that enters battery saving mode and switching power circuit 140, preferably through after one period delay period, switching power circuit 140 just enters " shut " mode".Delay period be to decide according to need for a long time.
Comparator 340 comparison node voltage N1 and reference voltage V DET2Such as, when node voltage N1 is higher than reference voltage V DET2The time, the output signal PWM_OFF of comparator 320 is a high logic state, vice versa.When output signal PWM_OFF was high logic state, switching power circuit 140 can enter " shut " mode"; Otherwise when output signal PWM_OFF was low logic state, switching power circuit 140 can return back to normal condition.
Transistor 390 is high power transistors, can provide High Level DC Voltage to transformer 130.Resistance R 6 is coupled to ground with an end of transistor 390.The grid of transistor 390 receives by PWM and produces the output signal OUT that circuit 310 is produced, and its source electrode is coupled to transformer 130, and its drain electrode is coupled to resistance R 6.For switching power circuit 140, transistor 390 can be external transistor, or built-in transistor.
Signal waveforms in Fig. 4 displayed map 3.Now please refer to Fig. 3 and Fig. 4, how to make switching power circuit 140 switch on " shut " mode" and normal condition with explanation.In Fig. 4, on behalf of PWM, OSC produce the output signal of the oscillating circuit in the circuit 310.
At first, during soft start (soft start), voltage V1 can rise.Then, when under normal mode, voltage V1 can fix, and the work period of the output signal OUT of PWM generation circuit 310 also can be fixed.Then, when time T 1, the load of back-end circuit 191 begins to change, so voltage V1 increases.Such as, when back-end circuit 191 comprised light-emitting diode (LED), if the brightness of LED changes, then for the power supply circuit of present embodiment, this was load and changes.
During load changed, the work period that PWM produces the output signal OUT of circuit 310 also changed.When load became heavy, the work period of output signal OUT became big; Otherwise when load lightened, the work period of output signal OUT diminished.Then, when time T 2, because voltage V1 is lower than reference voltage V DET1, make the output signal of comparator 320 change logic high state into, so because the charging current of 331 pairs of capacitor C 4 of current source, node voltage N1 begins to rise by logic low state.
Afterwards, when time T 3,,, voltage V1 is higher than reference voltage V so being increased to owing to return back to normal condition DET1, then node voltage N1 becomes low logic state (because the low logic output signal of comparator 320 outputs).
Then, when time T 4, enter power down mode, make voltage V1 be lower than reference voltage V DET1, and the work period of signal OUT is 0% (but at this moment, switching power circuit 140 does not enter " shut " mode" as yet).Because voltage V1 is lower than reference voltage V DET1, make that node voltage N1 begins to rise.When time T 5, node voltage N1 has been higher than reference voltage V DET2(that is, delay period cross) so signal PWM_OFF becomes high logic state, and closes switching power circuit 140 (PWM in the switching power circuit 140 produce circuit 310 and can be closed).As seen from Figure 4, reference voltage V DET2Value can determine time of delay.Refer to time of delay, and under battery saving mode, after the work period of output signal OUT was 0%, after time of delay (between the time T 4 to T5 of Fig. 4 during), switching power circuit 140 just can be closed.At this, switching power circuit 140 is closed representative and is, PWM produces circuit 310 and can be closed, and comparator 320, delay loop 330 and comparator 340 still are in normal operating state.
Then, when time T 6, return back to normal operating state (may be because the requirement or the voltage V3 subcritical value of back-end circuit 191), voltage V1 gos up to being higher than reference voltage V DET1, make node voltage N1 and signal PWM_OFF become logic low state in time point T6.So after time point T6, switching power circuit 140 returns back to normal condition.
In Fig. 3, postpone loop 330 and implement with analog circuit.Yet the present invention is not limited to this, postpones loop 330 also to implement with digital circuit.Now please refer to Fig. 5, it shows the digital delay loop according to the embodiment of the invention.As shown in Figure 5, postpone loop 330 and comprise counter 510.When voltage N1 was logic low, counter 510 can be reset.Otherwise when voltage N1 was logic high, counter 510 can counting.That is, can be considered rolling counters forward voltage N1 (or high logic output signal of count comparator 320).Counter 510 can be given comparator 520 by output count value CN.Comparator 520 is this count value CN and counting reference value CN relatively REFWhen count value CN less than counting reference value CN REFThe time, the low logical signal PWM_OFF of comparator 520 outputs; Otherwise, when count value CN equals to count reference value CN greatly REFThe time, the high logical signal PWM_OFF of comparator 520 outputs.Counting reference value CN REFRelevant for the time of delay that postpones loop 330.
The disclosed power supply circuit of the above embodiment of the present invention has multiple advantages, below only enumerates the part advantage and is described as follows.Under battery saving mode, can make switching power circuit enter " shut " mode", to close its inside assembly that consumes energy, further save power consumption.
In sum, though the present invention with the embodiment exposure as above, yet it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when doing various changes that are equal to or replacement.Therefore, protection scope of the present invention is when looking accompanying being as the criterion that the application's claim scope defined.

Claims (20)

1.一种电源供应电路，提供一电源电压给一后端电路，该电源供应电路包括：1. A power supply circuit that provides a power supply voltage to a back-end circuit, the power supply circuit comprising: 一开关电源电路，控制该电源电压；a switching power supply circuit for controlling the power supply voltage; 一闭回路反馈控制，在一正常模式下，该闭回路反馈控制以一闭回路将该电源电压反馈至该开关电源电路；以及a closed loop feedback control which, in a normal mode, feeds back the supply voltage to the switching power supply circuit in a closed loop; and 一开回路反馈控制，在一省电模式下，该开回路反馈控制以一开回路将该电源电压反馈至该开关电源电路；An open loop feedback control, in a power saving mode, the open loop feedback control feeds back the power supply voltage to the switching power supply circuit through an open loop; 其中当该开关电源电路持续检测到该开回路且该开关电源电路处于一实质零输出状态时，该开关电源电路进入一关闭模式。Wherein when the switching power supply circuit continuously detects the open loop and the switching power supply circuit is in a substantially zero output state, the switching power supply circuit enters into a shutdown mode. 2.根据权利要求1所述的电源供应电路，其特征在于，当该后端电路需要电源时，该闭回路反馈控制以该闭回路将该电源电压反馈至该开关电源电路，使该开关电源供应电路操作于该正常模式。2. The power supply circuit according to claim 1, wherein when the back-end circuit needs power, the closed loop feedback control uses the closed loop to feed back the power supply voltage to the switching power supply circuit, so that the switching power supply The supply circuit operates in the normal mode. 3.根据权利要求1所述的电源供应电路，其特征在于，还包括：3. The power supply circuit according to claim 1, further comprising: 一变压器，该开关电源电路耦合至该变压器的一初级侧，该后端电路与该闭回路反馈控制耦合至该变压器的一次级侧；a transformer, the switching power supply circuit is coupled to a primary side of the transformer, and the back-end circuit and the closed-loop feedback control are coupled to a secondary side of the transformer; 其中，该变压器将该开关电源电路的一输出电压耦合至其次级侧，以成为该电源电压。Wherein, the transformer couples an output voltage of the switching power supply circuit to its secondary side to become the power supply voltage. 4.根据权利要求3所述的电源供应电路，其特征在于，该变压器的一耦合期间受控于该开关电源电路的一输出工作周期。4. The power supply circuit according to claim 3, wherein a coupling period of the transformer is controlled by an output duty cycle of the switching power supply circuit. 5.根据权利要求3所述的电源供应电路，其特征在于，响应该闭回路的出现，该开关电源电路控制该输出电压。5. The power supply circuit of claim 3, wherein the switching power supply circuit controls the output voltage in response to the occurrence of the closed loop. 6.根据权利要求3所述的电源供应电路，其特征在于，当进入该省电模式时，该开回路反馈控制形成该开回路且使得该闭回路反馈控制无法形成该闭回路，如此，该电源电压无法经由该闭回路反馈至该开关电源电路。6. The power supply circuit according to claim 3, wherein when entering the power-saving mode, the open-loop feedback control forms the open loop and makes the closed-loop feedback control unable to form the closed loop, thus, the The power supply voltage cannot be fed back to the switching power supply circuit through the closed loop. 7.根据权利要求1所述的电源供应电路，其特征在于，当该电源电压低于一临界值时，该开关电源电路由该关闭模式回复至该正常状态。7. The power supply circuit according to claim 1, wherein when the power supply voltage is lower than a threshold value, the switching power supply circuit returns to the normal state from the shutdown mode. 8.根据权利要求3所述的电源供应电路，其特征在于，该闭回路反馈控制包括：8. The power supply circuit according to claim 3, wherein the closed-loop feedback control comprises: 一光耦合电路，耦合至该开关电源电路；以及an optical coupling circuit coupled to the switching power supply circuit; and 一电压参考控制器，耦合至该光耦合电路，该电压参考控制器稳压该电源电压；a voltage reference controller, coupled to the optocoupler circuit, the voltage reference controller regulates the supply voltage; 其中，在该正常模式下，该光耦合电路与该电压参考控制器形成该闭回路，使得该电源电压由该变压器的该次级侧反馈至该变压器的该初级侧。Wherein, in the normal mode, the optical coupling circuit and the voltage reference controller form the closed loop, so that the power supply voltage is fed back from the secondary side of the transformer to the primary side of the transformer. 9.根据权利要求8所述的电源供应电路，其特征在于，当处于该省电模式下，该电压参考控制器被启动，且该电压参考控制器的一节点电压被该开回路反馈控制钳制住，所以，该闭回路无法形成。9. The power supply circuit according to claim 8, wherein when in the power-saving mode, the voltage reference controller is enabled, and a node voltage of the voltage reference controller is clamped by the open-loop feedback control Therefore, the closed loop cannot be formed. 10.根据权利要求9所述的电源供应电路，其特征在于，该开回路反馈控制吸收由该电压参考控制器所提供的一电流。10. The power supply circuit of claim 9, wherein the open loop feedback control sinks a current provided by the voltage reference controller. 11.根据权利要求3所述的电源供应电路，其特征在于该开关电源电路包括：11. The power supply circuit according to claim 3, characterized in that the switching power supply circuit comprises: 一信号产生电路，耦合至该变压器；以及a signal generating circuit coupled to the transformer; and 一控制电路，耦合至该信号产生电路，该控制电路控制该信号产生电路进入该关闭模式。A control circuit is coupled to the signal generating circuit, and the control circuit controls the signal generating circuit to enter the shutdown mode. 12.根据权利要求11所述的电源供应电路，其特征在于，该控制电路包括：12. The power supply circuit according to claim 11, wherein the control circuit comprises: 一第一比较器，耦合至该闭回路反馈控制，该第一比较器比较该闭回路反馈控制所反馈的一第一电压与一第一参考电压，并输出一比较信号；A first comparator, coupled to the closed-loop feedback control, the first comparator compares a first voltage fed back by the closed-loop feedback control with a first reference voltage, and outputs a comparison signal; 一延迟回圈，根据该第一比较信号而产生一第二电压；以及a delay loop for generating a second voltage according to the first comparison signal; and 一第二比较器，比较该第二电压与一第二参考电压，以输出一控制信号至该信号产生电路，该控制信号控制该信号产生电路是否进入该关闭模式。A second comparator compares the second voltage with a second reference voltage to output a control signal to the signal generating circuit, and the control signal controls whether the signal generating circuit enters the shutdown mode. 13.根据权利要求12所述的电源供应电路，其特征在于该延迟回圈包括：13. The power supply circuit according to claim 12, wherein the delay loop comprises: 一电流源；以及a current source; and 一电容，接收该第一比较信号，该电流源对该电容充电。A capacitor receives the first comparison signal, and the current source charges the capacitor. 14.根据权利要求11所述的电源供应电路，其特征在于，该控制电路包括：14. The power supply circuit according to claim 11, wherein the control circuit comprises: 一第一比较器，耦合至该闭回路反馈控制，该第一比较器比较该闭回路反馈控制所反馈的一第一电压与一第一参考电压，并输出一比较信号；A first comparator, coupled to the closed-loop feedback control, the first comparator compares a first voltage fed back by the closed-loop feedback control with a first reference voltage, and outputs a comparison signal; 一计数器，计数该第一比较信号而产生一计数信号；以及a counter, counting the first comparison signal to generate a count signal; and 一第二比较器，比较该计数信号与一计数参考值，以输出一控制信号至该信号产生电路，该控制信号控制该信号产生电路是否进入该关闭模式。A second comparator compares the count signal with a count reference value to output a control signal to the signal generating circuit, and the control signal controls whether the signal generating circuit enters the shutdown mode. 15.一种电源供应方法，提供一电源电压给一后端电路，该电源供应方法包括：15. A power supply method, providing a power supply voltage to a back-end circuit, the power supply method comprising: 在一正常模式下，通过一闭回路以反馈该电源电压；In a normal mode, the supply voltage is fed back through a closed loop; 在一省电模式下，通过一开回路以反馈该电源电压；以及In a power-saving mode, feedback the supply voltage through an open loop; and 其中当持续检测到该开回路，进入一关闭模式。Wherein when the open circuit is continuously detected, a closed mode is entered. 16.根据权利要求15所述的电源供应方法，其特征在于，还包括：16. The power supply method according to claim 15, further comprising: 当进入该省电模式时，形成该开回路且打断该闭回路。When entering the power saving mode, the open loop is formed and the closed loop is broken. 17.根据权利要求15所述的电源供应方法，其特征在于，还包括：17. The power supply method according to claim 15, further comprising: 当该电源电压低于一临界值时，由该关闭模式回复至该正常状态。When the power supply voltage is lower than a critical value, the shutdown mode returns to the normal state. 18.根据权利要求15所述的电源供应方法，其特征在于，还包括：18. The power supply method according to claim 15, further comprising: 利用该闭回路来稳压该电源电压。The supply voltage is regulated by the closed loop. 19.根据权利要求15所述的电源供应方法，其特征在于，还包括：19. The power supply method according to claim 15, further comprising: 比较通过该闭回路而反馈的一第一电压与一第一参考电压，以输出一比较信号；Comparing a first voltage fed back through the closed loop with a first reference voltage to output a comparison signal; 根据该第一比较信号而产生一第二电压；以及generating a second voltage according to the first comparison signal; and 比较该第二电压与一第二参考电压，以输出一控制信号，该控制信号控制是否进入该关闭模式。Comparing the second voltage with a second reference voltage to output a control signal, the control signal controls whether to enter the shutdown mode. 20.根据权利要求15所述的电源供应方法，其特征在于，还包括：20. The power supply method according to claim 15, further comprising: 比较通过该闭回路而反馈的一第一电压与一第一参考电压，并输出一比较信号；comparing a first voltage fed back through the closed loop with a first reference voltage, and outputting a comparison signal; 一计数器，计数该第一比较信号而产生一计数信号；以及a counter, counting the first comparison signal to generate a count signal; and 一第二比较器，比较该计数信号与一计数参考值，以输出一控制信号，该控制信号控制是否进入该关闭模式。A second comparator compares the count signal with a count reference value to output a control signal, and the control signal controls whether to enter the shutdown mode.
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Cited By (3)

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CN105867502A (en) * 2016-05-18 2016-08-17 湖州绿明微电子有限公司 LDO voltage regulator and alternating-current equipment
CN112260530A (en) * 2020-12-22 2021-01-22 深圳英集芯科技股份有限公司 Power supply soft start control circuit, control chip and control device
WO2023207042A1 (en) * 2022-04-29 2023-11-02 深圳市正浩创新科技股份有限公司 Power supplying control method and apparatus and power supply device

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KR0141217B1 (en) * 1993-11-30 1998-06-15 김광호 Standby power saving circuit
CN100505493C (en) * 2002-04-18 2009-06-24 姜涛 Green switch power supply with standby function and its IC
CN2708347Y (en) * 2004-05-26 2005-07-06 天津光电通信技术有限公司 Low-power-consumption power supply
KR100706239B1 (en) * 2005-01-28 2007-04-11 삼성전자주식회사 Voltage Regulator Reduces Power Consumption in Standby Mode

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Publication number Priority date Publication date Assignee Title
CN105867502A (en) * 2016-05-18 2016-08-17 湖州绿明微电子有限公司 LDO voltage regulator and alternating-current equipment
CN105867502B (en) * 2016-05-18 2017-10-10 湖州绿明微电子有限公司 LDO pressure regulators, alternating current equipment
CN112260530A (en) * 2020-12-22 2021-01-22 深圳英集芯科技股份有限公司 Power supply soft start control circuit, control chip and control device
WO2023207042A1 (en) * 2022-04-29 2023-11-02 深圳市正浩创新科技股份有限公司 Power supplying control method and apparatus and power supply device

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