WO2010069142A1

WO2010069142A1 - Method for reducing standby power consumption of power source system and power source system

Info

Publication number: WO2010069142A1
Application number: PCT/CN2009/001476
Authority: WO
Inventors: 熊江; 刘永根
Original assignee: 炬力集成电路设计有限公司
Priority date: 2008-12-17
Filing date: 2009-12-16
Publication date: 2010-06-24
Also published as: CN101458538A

Abstract

A power source system (5) comprises a normal mode detecting and controlling circuit (52), a power-saving mode detecting and controlling circuit (51) and an output circuit (53), wherein the power-saving mode detecting and controlling circuit (51) further includes a non-continuous power-saving mode detecting and controlling circuit unit. A method for reducing standby power consumption of the power source system comprises the following step: bias currents in the non-continuous power-saving mode detecting and controlling circuit unit are increased in a first operating mode and decreased in a second operating mode according to the alternate of operating mode of non-continuous power-saving mode detecting and controlling circuit unit in the power-saving mode. Thus, average standby power consumption of the power source system is reduced and the product is energy saving.

Description

Method and power supply system for reducing standby power consumption of power supply system

The present invention relates to the field of power supply technologies, and in particular, to a method and a power supply system for reducing standby power consumption of a power supply system. Background technique

The function of the power supply system is to effectively control the input fluctuating voltage source to provide a predetermined voltage source to the load. The power system can be one of or a plurality of switching power supplies, linear adjustment tubes and charge pumps. The power types are combined.

The conversion efficiency of the power system is a function of the magnitude of its load current. Generally speaking, under light load conditions, as the load current decreases, the power consumption of the power system itself accounts for a larger proportion of the total system power consumption, resulting in The conversion efficiency of power systems is getting lower and lower. Therefore, in order to reduce the power consumption of the power system itself under light load, the power system is generally required to be in a power saving mode, such as a standby mode, a sleep mode, or a sleep mode. The standby mode refers to saving data in the memory and then cutting off the unused state. The power supply of the device, but still provide power supply to the memory to ensure that the data will not be lost in the memory; sleep mode means to save all the data to the hibernation file on the hard disk, then turn off the computer, completely power off, When the operating system is woken up, the related content will be directly read into the memory to restore the data. Sleep mode means that when the mode is entered, the functions and functions are similar to the standby mode, but when the battery is low, the data is automatically saved to In the hibernation file on the hard disk, then turn off the computer and completely power off. In the power-saving mode, most of the modules of the power system are in the off state. Only some circuit modules that consume less power are used to monitor, detect, or wake up the power system. At this time, the power consumption of the entire power system is called standby. Power consumption.

For battery-powered portable products, the power system operates much longer under light load conditions than at medium or heavy loads, so the standby power consumption of the power system determines the battery life. In addition, as the requirements for energy saving and environmental protection of products are getting higher and higher, the attention paid to the standby power consumption of power supply systems for non-battery-powered products is also increasing. So when the power system is in power save mode, It is necessary to ensure that the circuit modules used for monitoring, detecting or waking up work properly and accurately, and to minimize the standby power consumption to extend battery life or save energy.

1 shows the architecture of a power supply system 1 of an existing low power consumption design. The power saving mode detection and control circuit 11 is configured to continuously detect an external or internal signal input condition of the power system when the power system is in the power saving mode, and then The detection result is processed and the control signal is output; the normal mode detection and control circuit 12 is configured to detect an external or internal signal input condition after the power system exits the power saving mode and enter the normal operation mode, and then processes the detection result and outputs the control signal. The other device and circuit portion 13 is another necessary part of the power system, such as a power switch tube, and may also include a battery charging module, and its working state is completely controlled by the power saving mode detecting and controlling circuit 11 and the normal mode detecting and controlling circuit 12 Control of the control signal for generating the power supply voltage required by the system; wherein when the system is operating normally, the normal mode detection and control circuit 12 issues a reset signal to the power saving mode detection and control circuit 11 or issues other control signals to further reduce Power saving mode detection and control The bias current of some circuit units in 11 reduces the power consumption of the power system during normal operation. Of course, the normal mode detection and control circuit 12 may not send any signal to the power saving mode detection and control circuit 11; The power supply system, when the power saving mode detecting and controlling circuit 11 receives the external input signal and needs the power system to work normally, the power saving mode detecting and controlling circuit 11 sends an enable signal to the normal mode detecting and controlling circuit 12 to make it normal. The mode detecting and controlling circuit 12 works normally. Of course, the power saving mode detecting and controlling circuit 11 may not send any signal to the normal mode detecting and controlling circuit 12, and the enable signal of the normal mode detecting and controlling circuit 12 is input signal from the power system. provide.

The existing power system low-power design is improved for the circuit unit inside the power-saving mode detection and control circuit 11 in FIG. 1, and the bias current of some circuit units is reduced under the premise of satisfying the system function and performance. , to achieve the purpose of reducing standby power consumption of the power system. Although some of the circuit unit bias currents in the power saving mode detection and control circuit 11 are lowered, there is always a non-negligible bias current throughout the standby, sleep or sleep time, and power consumption is always being used. Summary of the invention It is an object of embodiments of the present invention to provide a method and a power supply system for reducing standby power consumption of a power supply system.

Embodiments of the present invention provide a power supply system that operates in a normal operating mode or a power saving mode, the power supply system including a normal mode detection and control circuit, a power saving mode detection and control circuit, and an output circuit:

The normal mode detecting and controlling circuit operates in the normal working mode, and stops working in the power saving mode;

The power saving mode detecting and controlling circuit includes a discontinuous power saving mode detecting and controlling circuit unit, wherein the circuit unit switches between a first state and a second state in a power saving mode, wherein the first state is biased The current is controlled within a predetermined standard operating value range, and in the second state, the bias current is controlled to be lower than the standard operating value range;

The output circuit is operative to generate an output signal of the power system in response to an output signal of the normal mode detection and control circuit and the power saving mode detection and control circuit.

Embodiments of the present invention also provide a method for reducing standby power consumption of a power system, the power system including a normal mode detection and control circuit, a power saving mode detection and control circuit, and an output circuit; the normal mode detection and control circuit is Working in the normal working mode, stopping in the power saving mode; the power system includes a discontinuous power saving detection and control circuit unit; the output circuit is configured to respond to the normal mode detection and control circuit and the An output signal of the power saving mode detecting and controlling circuit, generating an output signal of the power system; the method comprising:

And causing, in the power saving mode, the discontinuous power saving detection and control circuit unit to switch between the first state and the second state, wherein the bias current is within a predetermined standard operating value range in the first state; In the second state, its bias current is in the range of the standard operating value.

In the embodiment of the present invention, the discontinuous power-saving detection and control circuit unit in the control power-saving mode detection and control circuit is switched in the first state and the second state, because the discontinuous power-saving detection and control circuit in the second state The bias current of the unit is lower than the standard operating range of the unit when it normally performs its function, thus reducing the average standby power consumption of the entire power system and saving energy. DRAWINGS

1 is a schematic structural diagram of a power supply system of an existing low power design;

2 is a structural diagram of a power supply system according to an embodiment of the present invention;

3 is a structural diagram of another power supply system according to an embodiment of the present invention;

4 is a structural diagram of another power supply system according to an embodiment of the present invention;

FIG. 5 is a structural diagram of a discontinuous power saving detection and control circuit unit according to an embodiment of the present invention; FIG.

6 is another structural schematic diagram of a discontinuous power saving detection and control circuit unit according to an embodiment of the present invention;

7 is a waveform diagram of a pulse signal for controlling a discontinuous power saving detection and control circuit according to an embodiment of the present invention;

Figure 8 is a diagram showing the standby power consumption waveform of the discontinuous power-saving detection and control circuit unit controlled by the pulse signal 1 in Figure 7. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the embodiment of the present invention, the power saving mode detecting and controlling circuit is divided into a continuous power saving detecting and controlling circuit unit, and a discontinuous power saving detecting and controlling circuit unit, and the standby power consumption of the discontinuous power saving detecting and controlling circuit unit is Further decrease.

A battery-powered portable product is taken as an example. When in standby mode, the power system is also required to detect battery status. For example, the power system needs to detect whether the battery voltage is too low. If the battery voltage is too low, the power control circuit module will send a low power warning signal to the power system. According to the characteristics of the battery itself, the voltage value of the battery that is normally used is very slow, so in many applications, it is not necessary to continuously detect whether the battery voltage is too low, allowing every 1 second or several. It is only detected in seconds that the battery voltage is too low, that is, the circuit module for detecting whether the battery voltage is too low does not need to work continuously, and it is allowed to work every 1 second or several seconds, in this 1 second. Or a few seconds interval, the circuit module used to detect whether the battery voltage is too low can be turned off or its bias current is reduced, so that the bias current is lower than the standard operating range, which greatly reduces the detection. The average power consumption of the module. 2 is a block diagram showing a power supply system of an embodiment of the present invention. The power system 20 operates in a normal operation mode or a power saving mode, and includes a normal mode detection and control circuit 21, a power saving mode detection and control circuit 22, and Other devices and circuits (in Figure 2, the output circuit 23):

The normal mode detecting and controlling circuit 21 operates in the normal operating mode and stops operating in the power saving mode;

The power saving mode detecting and controlling circuit 22 includes a discontinuous power saving mode detecting and controlling circuit unit 24, and the circuit unit 24 switches between the first state and the second state in the power saving mode, wherein the first state is biased The set current is controlled within a predetermined standard operating value range, and in the second state, the bias current is controlled to be lower than the standard operating value range;

The output circuit 23 is responsive to the output signals 27, 28 of the normal mode detection and control circuit 21 and the power save mode detection and control circuit 22 to produce an output signal 29 of the power supply system 20.

FIG. 3 is a structural diagram of a power supply system according to another embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.

Referring to FIG. 3, the power supply system 5 includes a power saving mode detecting and controlling circuit 51, a normal mode detecting and controlling circuit 52, and other devices and circuits (in FIG. 3, the output circuit 53), wherein: the power saving mode detecting and controlling circuit 51 Working when the power system is in the power saving mode, such as detecting the first signal input externally or internally by the power system, then processing the detection result and outputting the first control signal; the power saving mode detecting and controlling circuit 51 includes discontinuous power saving Mode detection and control circuit unit 1, 2:

The discontinuous power saving mode detecting and controlling circuit unit 1 and 2 switch between the first state and the second state when the power system 5 is in the power saving mode, wherein the discontinuous power saving mode check is performed in the first state The bias currents of the measurement and control circuit units 1, 2 are controlled within respective standard operating value ranges, and the bias currents are controlled to be lower than the respective standard operating value ranges in the second state; The first state may be, for example, the need to monitor, detect, or wake up the power system, and the second state may be, for example, no need to monitor, detect, or wake up the power system.

The normal mode detecting and controlling circuit 52 is configured to operate in the normal working mode, and stop working in the power saving mode, such as detecting the external or internal input after the power system exits the power saving mode and enters the normal working mode. The signal is then processed and the second control signal is output.

The other device and circuit portion 53 is another necessary part of the power system, such as a power switch tube, and may also include a battery charging module. The other device and circuit portion 53 is responsive to the normal mode detection and control circuit 52 and the power saving mode detecting and controlling circuit 51. The output signal produces an output signal of the power system 9.

The power saving mode detecting and controlling circuit 51 of the embodiment of the present invention may further include continuous power saving mode detecting and controlling circuit units 3 and 4, and in the power saving mode, the continuous power saving mode detecting and controlling circuit unit 3, 4 is biased. The current is kept within the respective standard operating values.

The power supply system of the embodiment of the present invention may further include a pulse generating circuit 54 that controls the discontinuous power saving detecting and controlling the change of the bias current of the circuit units 1, 2 to switch between the first state and the second state by generating a pulse signal. When the discontinuous power-saving detection and control circuit unit 1 and the discontinuous power-saving detection and control circuit unit 2 need to perform their functions normally (such as monitoring, detecting or waking up the power system), controlling the discontinuous power-saving detection and control circuit unit 1 and the bias current of the discontinuous power-saving detection and control circuit unit 2 are within respective standard operating values; and when the discontinuous power-saving detection and control circuit unit 1 and the discontinuous power-saving detection and control circuit unit 2 are not executable The pulse generating circuit 54 controls the discontinuous power-saving detecting and controlling circuit unit 1 and the discontinuous power-saving detecting and controlling circuit unit 2 to have a low bias current when the function or the reliability, speed, or the like of the function is low. Within the scope of their respective standard operating values. The pulse generating circuit 54 can be generated by the control of other circuits to generate a pulse signal, or can be generated without the control circuit, such as a random signal generator, etc., and the pulse generating circuit 54 can also generate normal circuits for each circuit unit in the power system. The working clock signal and the signals of some special applications, such as the maximum or minimum duty cycle signal required by the power system. As another embodiment of the present invention, the pulse generating circuit can be built in the power saving mode detecting and controlling circuit 51 as shown in FIG.

FIG. 5 shows a specific implementation manner of the discontinuous power-saving detection and control circuit unit in FIG. 3 or FIG. 4, which can use a pulse signal with a higher duty cycle and consume only lower power consumption. 5. The pulse signal with a duty ratio of 50% is sequentially divided by the flip-flop 1 and the flip-flop 2 to obtain a two-divided signal Q1 and a four-divided signal Q2, and the two-divided signal Q1 and the four-divided signal Q2 pass through the AND gate 71. After the logical AND operation, a pulse signal EN1 with a duty ratio of 25% is generated, and finally the discontinuous power-saving detection and control circuit module 72 adjusts its own bias current according to the pulse signal ENI to switch between the first state and the second state. Taking the detection battery as an example, the discontinuous power-saving detection and control circuit module 72 performs discontinuous detection on the voltage of the battery BAT. When the pulse signal EN1 is at a high level, the discontinuous power-saving detection and control circuit module 72 sets the voltage of the battery BAT. Comparing with the reference voltage VRF, determining whether the battery voltage is too low, the discontinuous power-saving detection and control circuit module 72 consumes a certain power consumption; when the pulse signal EN1 is low, the discontinuous power-saving detection and control circuit module 72 The bias current is turned off, and the voltage of the battery BAT is stopped. It can be seen that the discontinuous power-saving detection and control circuit unit receives the pulse signal with a duty ratio of 50%, and the power consumption is only the power consumption during continuous operation. One quarter of the.

It should be understood that, in a specific implementation, the number of cascaded flip-flops and the frequency of the input pulse signal may be set according to the requirements of the specific discontinuous power-saving detection and control circuit unit, and according to the number of the plurality of cascaded flip-flops The frequency-divided signal outputted by one flip-flop and the frequency-divided signal output by the last flip-flop signal are output after logical AND operation, and the discontinuous power-saving detection and control circuit module adjusts its own bias current in the first state and the second state. Switch between states to achieve non-continuity to monitor, detect, or wake up the power system.

6 shows another specific implementation of the discontinuous power-saving detection and control circuit unit of FIG. 3 or FIG. 4, wherein a signal with a duty cycle of 50% and a frequency-divided signal obtained by the trigger 1 are obtained. The input AND circuit 81 performs a logical AND operation process to obtain a pulse signal EN1 having a duty ratio of 25%. According to the pulse signal EN1, the discontinuous power-saving detection and control circuit module 82 adjusts its own bias current. It can be seen that compared with the circuit shown in Fig. 5, the use of one flip-flop is reduced, and the cost is saved. It should be understood that, in FIG. 6, the number of cascaded flip-flops and the frequency of the input pulse signal may also be set according to the requirements of the specific discontinuous power-saving detection and control circuit unit, such as setting at least two cascaded flip-flops and An AND gate, at least two cascaded flip-flops for frequency-dividing the input pulse signal step by step; an AND gate for arranging any two of the at least two cascaded flip-flops The output frequency-divided signal is logically ANDed; or the pulse signal received by the first trigger is logically ANDed with the frequency-divided signal output by any one of the triggers. The signal of the M-and-gate operation output, the discontinuous power-saving detection and control circuit module adjusts its own bias current to switch between the first state and the second state.

An embodiment of the present invention further provides a method for P power consumption of a low power system, wherein the power system may have the structure of the power system in any of the above embodiments, and the method includes:

The non-continuous power-saving detection and control circuit unit is switched between a first state and a second state in a power-saving mode, wherein the bias current is within a predetermined standard operating value range in the first state, In the second state, its bias current is lower than the standard operating value range.

Wherein, depending on actual needs, the bias current of the discontinuous power-saving detection and control circuit unit in the second state may be turned off (for example, when the discontinuous power-saving detection and control circuit unit 2 may not perform its function), or lower than The standard operating value range is not turned off (for example, when the reliability requirements of the functions performed by the discontinuous power-saving detection and control circuit unit are low).

In the embodiment of the present invention, the discontinuous power-saving detection and control circuit unit can be controlled to switch between the first state and the second state by using a pulse signal. When the power system includes a plurality of discontinuous power-saving detection and control circuit units, A plurality of non-continuous power-saving detection and control circuit units having the same first state duration and interval time can be uniformly controlled by using a set of pulse signals, such as using a set of pulse signals for multiple monitoring, detecting, or waking time intervals. The discontinuous power-saving detection and control circuit unit performs unified control. As shown in FIG. 7, the pulse signal 1 is used to control a plurality of non-continuous power-saving detection and control circuit units in which a group of monitoring, detecting or waking time intervals are consistent, and The pulse signal 2 is used to control a plurality of non-continuous power-saving detection and control circuit units in which another group of monitoring, detecting or waking time intervals are consistent, and the implementation may be implemented by a pulse generating circuit, which may be subjected to other The pulse signal is generated by the control of the circuit, and may also be generated by itself without the control circuit. Such as a random signal generator, etc., and configure the number of groups of pulse signals according to the actual situation.

FIG. 8 is a diagram showing the standby power consumption waveform of the discontinuous power-saving detection and control circuit unit controlled by the pulse signal 1 in FIG. 7 according to the embodiment of the present invention, and the discontinuous power-saving detection and control circuit unit controlled by the pulse signal 2 The standby power waveform has the same principle. Referring to FIG. 8, when the pulse signal 1 is at a high level, the discontinuous power-saving detection and control circuit unit is switched to the first state, and the corresponding discontinuous power-saving detection and control circuit unit is enabled or increased in bias current. The bias current is controlled within a predetermined standard operating value range so that it can perform its functions accurately and quickly (such as monitoring, detecting, or waking up the power system), at this time, the discontinuous power-saving detection and control circuit unit The standby power consumption is proportional to the high-level time length of the pulse signal 1; when the pulse signal 1 is low, the discontinuous power-saving detection and control circuit unit switches to the second state, in the discontinuous power-saving detection and control circuit unit The bias current is turned off or reduced below the standard operating value range, so that the standby power consumption of the discontinuous power saving detection and control circuit unit is reduced or nearly negligible during this time period. The area of the shaded portion in the waveform of Figure 8 represents the standby power consumption of the discontinuous power-saving detection and control circuit unit adjusting its own bias current according to pulse signal 1 when switching between the first state and the second state. During the standby time of the power system, the ratio of the sum of all the high-level time lengths of the pulse signal 1 to the length of the standby time is referred to as the average duty ratio D1 of the pulse signal 1, and the average duty ratio D1 of the pulse signal 1 is also The modulation coefficient Kl, K1, which is called the discontinuous power-saving detection and control circuit unit standby power consumption, is proportional to the average power consumption of the discontinuous power-saving detection and control circuit unit. Therefore, when the discontinuous power-saving detection and control circuit unit is switched to the second state (for example, the power supply system is not required to continuously monitor, detect or wake up), the modulation coefficient K1 can be appropriately adjusted to minimize the average standby power consumption. .

In the embodiment of the present invention, the discontinuous power-saving detection and control circuit unit in the control power-saving mode detection and control circuit is switched in the first state and the second state, because the discontinuous power-saving detection and control circuit in the second state The bias current of the unit is lower than the standard operating value range when the unit performs its function normally, thus reducing the average standby power consumption of the entire power system and making the product energy-saving; further, triggering in the discontinuous power-saving detection and control circuit unit The use of the AND gates also enables the use of higher duty cycle pulse signals while consuming less power.

The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Rights request

What is claimed is: 1. A power supply system, wherein the power supply system operates in a normal operating mode or a power saving mode, wherein the power supply system comprises a normal mode detection and control circuit, a power saving mode detection and control circuit, and an output circuit:

2. The power supply system according to claim 1, wherein the power saving mode detecting and controlling circuit further comprises:

A continuous power saving mode detection and control circuit unit that maintains its bias current within a predetermined standard operating value range in the power saving mode.

3. The power supply system according to claim 1, wherein the discontinuous standby power saving mode detecting and controlling circuit unit is switched between the first state and the second state by a pulse signal control.

4. The power supply system according to claim 3, wherein the bias current of the non-continuous power saving mode detecting and controlling circuit unit is turned off in the second state.

The power supply system according to claim 3, wherein in the second state, the bias current of the non-continuous power saving mode detecting and controlling circuit unit is lower than the standard operating value range and is not turned off.

The power supply system according to any one of claims 3 to 5, wherein the discontinuous power saving mode detecting and controlling circuit unit comprises:

At least two cascaded flip-flops for stepping into the pulse signal input to the first trigger Line division processing;

An AND gate for logically ANDing a frequency-divided signal output by the first one of the at least two cascaded flip-flops and a frequency-divided signal output by the last one of the flip-flops;

The discontinuous power saving mode detecting and controlling module is configured to switch between the first state and the second state according to the signal outputted by the AND gate operation.

a flip-flop for dividing a pulse signal input to the flip-flop; an AND gate for logically ANDing the pulse signal and the frequency-divided signal output by the flip-flop;

At least two cascaded flip-flops for frequency-dividing the pulse signals input to the first-stage flip-flops step by step;

An AND gate for performing a logical AND operation on the divided signals output by any two of the at least two cascaded flip-flops; or performing the frequency-divided signal output by the pulse signal and any one of the triggers Logical AND operation;

9. A method of reducing standby power consumption of a power supply system, the power supply system comprising a normal mode detection and control circuit, a power saving mode detection and control circuit, and an output circuit; wherein the normal mode detection and control circuit is Working in the normal working mode, stopping in the power saving mode; the power system includes a discontinuous power saving detection and control circuit unit; the output circuit is configured to respond to the normal mode detection and control circuit and the An output signal of the power saving mode detecting and controlling circuit, generating an output signal of the power system; the method comprising: The non-continuous power-saving detection and control circuit unit is switched between a first state and a second state in a power-saving mode, wherein the bias current is within a predetermined standard operating value range in the first state, In the second state, its bias current is in the range of the standard operating value.

10. The method of claim 9, wherein the bias current is lower than the standard operating value range, specifically, the bias current is turned off.

The method for reducing standby power consumption of a power supply system according to claim 9, wherein the bias current is lower than the standard operating value range, specifically, the bias current is lower than the standard working value range and Not turned off.

12. A method of reducing standby power consumption of a power supply system according to any of claims 9-11, wherein the discontinuous power saving detection and control circuit unit is switched between the first state and the second state by a pulse signal.

13. The method for reducing standby power consumption of a power supply system according to claim 9, wherein a plurality of non-continuous power-saving detection and control circuit units having the same first state duration and interval time are used by using a set of pulse signals Unified control.

The method of claim 9, wherein the power system further comprises a continuous power saving mode detecting and controlling circuit unit; the method further comprising:

The continuous power saving mode detecting and controlling circuit unit maintains its bias current within a predetermined standard operating value range in the power saving mode.

15. The method of claim 9, wherein the switching between the first state and the second state by the pulse signal control discontinuous power saving detection and control circuit unit comprises:

Performing at least two stages of frequency division on a pulse signal;

Performing a logical AND operation on the frequency-divided signals respectively obtained by the first-stage frequency division processing and the other-stage frequency division processing;

Controlling, by the logic and operation, a signal between the first state and the second state by the discontinuous power saving detection and control circuit unit

16. The method of claim 9, wherein the switching between the first state and the second state by the pulse signal control discontinuous power saving detection and control circuit unit comprises:

Performing a frequency division process on a pulse signal;

Performing a logical AND operation on the pulse signal and the frequency-divided signal obtained by the frequency division process; using the signal obtained by the logic and operation to control the discontinuous power-saving detection and control circuit unit in the first state and the Switch between the two states.