CN101453163A - Apparatus and method for regulating working frequency of step-down conversion circuit by detection current - Google Patents
Apparatus and method for regulating working frequency of step-down conversion circuit by detection current Download PDFInfo
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- CN101453163A CN101453163A CNA2007101967002A CN200710196700A CN101453163A CN 101453163 A CN101453163 A CN 101453163A CN A2007101967002 A CNA2007101967002 A CN A2007101967002A CN 200710196700 A CN200710196700 A CN 200710196700A CN 101453163 A CN101453163 A CN 101453163A
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Abstract
The invention provides a device and a method for regulating the working frequency of a voltage reduction switching circuit through current detection. The device comprises a current detection circuit, a variable module and a controller. The current detection circuit is used for judging the output load state of the voltage reduction switching circuit through the detection of the size of current flowing out from the voltage reduction switching circuit and outputting a control signal for regulating the working frequency of the voltage reduction switching circuit according to the load state. The variable module is coupled with the voltage reduction switching circuit and is used for providing an external resistor for the voltage reduction switching circuit. The controller is coupled to a current monitoring module and the variable module and is used for receiving the control signal and regulating the resistance value of the variable module according to the control signal so as to regulate the working frequency of the voltage reduction switching circuit. The device and the method can reduce loss of the voltage reduction switching circuit.
Description
Technical field
The invention relates to a kind of power supply power supply technique, and particularly relevant for a kind of technology that reduces the loss of power supply power supply unit.
Background technology
Along with the development of electronic information technology, many circuit all require to convert cell voltage to supply power voltage, as battery-powered handheld devices such as mobile phone, hand-held computers, all need to convert cell voltage to supply power voltage.And VRD (voltage regulator down, decompression converting circuit) module is to be used in the general power supply unit as basic voltage regulator circuit, and therefore increasing VRD module is used in the various electronic products.
Major part all uses VRD as the power supply power supply unit to CPU (central processing unit) in current computer.But because current VRD module all adopts fixed switching frequency, therefore, when it is applied to when going in the computer, no matter whether CPU is at light condition or heavy condition, the frequency of VRD module is all constant.This makes the switching loss of VRD module all be in bigger level, causes the waste of the energy.
Yet,, effectively utilize the limited energy to become people's common recognition in the green epoch that environmental consciousness comes into one's own day by day.At present developed country is to the increasingly stringent that requires of electric equipment products power consumption aspect, and formulated a lot of standard criterions at stand-by power consumption.In order to meet these standards, a lot of new technologies are arisen at the historic moment, main thought be allow the switch power supply in load very little or unloaded can be when being in holding state to operate than low switching frequency.
The TaiWan, China patent No. is that the direct current output that the patent of TW00509832 has disclosed the power supply conversion unit is that the pulse signal that utilizes the PWM unit to be produced is controlled, one arithmetic element detects output current, and based on the operational pattern of measured current value decision load, when output current is faint, one is generally little value and is read in the cycle recorder, and PWM is according to being stored in the periodic recording device and the computing register produces a pulse signal.
The patent No. is that the patent of TW00509832 is to detect output current and determine the operational pattern of load with arithmetic element, and then regulates this pulse signal, has solved the excessive problem of processor power consumption.But, do not solve to CPU provides the VRD modular power of voltage and consume excessive problem.And said system needs arithmetic element, single-chip microcomputer etc., and it has higher cost, and testing process is complicated.
Summary of the invention
One of purpose of the present invention is providing a kind of by detecting the device of electric current adjustment working frequency of step-down conversion circuit, to solve prior art cost height, testing process complicated problems.
Another object of the present invention is providing a kind of by detecting the method for electric current adjustment working frequency of step-down conversion circuit, it reduces the operating frequency of decompression converting circuit in the time of can being in underloading in the output of decompression converting circuit, or increases the operating frequency of decompression converting circuit when the output of decompression converting circuit is in heavy duty.
The present invention proposes a kind of by detecting the device of electric current adjustment working frequency of step-down conversion circuit, comprising: current detection circuit, variable module and controller.Current detection circuit is used for judging by the size that detects the electric current that flows out decompression converting circuit the output loading state of present decompression converting circuit, and exports the control signal of adjusting working frequency of step-down conversion circuit according to this output loading state.Variable module is coupled to decompression converting circuit, is used to decompression converting circuit that outer meeting resistance is provided.Controller is coupled to current monitoring module and variable module, is used to receive control signal, and adjusts the resistance of variable module according to control signal, adjusts the operating frequency of decompression converting circuit with this.
Adjust the device of working frequency of step-down conversion circuit according to preferred embodiment of the present invention is described by detecting electric current, above-mentioned current detection circuit comprises: inductance, electric capacity and error amplifier.Inductance is arranged within the voltage stabilizing circuit of decompression converting circuit, and is coupled to the output of decompression converting circuit, is used for flowing through measuring current when decompression converting circuit provides power supply for central processing unit.Be connected in parallel to inductance behind the capacitances in series flow measurement resistance, be used to obtain the test voltage corresponding with measuring current.Error amplifier has first input end, second input and output, and first input end/second input is coupled to electric capacity, is used to amplify test voltage.
Adjust the device of working frequency of step-down conversion circuit according to preferred embodiment of the present invention is described by detecting electric current, above-mentioned variable module comprises first oscillation resistance and second oscillation resistance, controller is a switching device, switching device is connected with first oscillation resistance, and switching device links to each other with current detection circuit, be used for according to control signal conversion conducting or cut-off state, second oscillation resistance is in parallel with first oscillation resistance and switching device.
Adjust the device of working frequency of step-down conversion circuit according to preferred embodiment of the present invention is described by detecting electric current, above-mentioned switching device is a transistor, transistor has first source/drain electrode, second source/drain electrode and the grid, first source/drain electrode is coupled to first oscillation resistance, second source/drain electrode is coupled to earthed voltage, grid is coupled to current detection circuit, is used for according to control signal conversion conducting or cut-off state.
Adjust the device of working frequency of step-down conversion circuit according to preferred embodiment of the present invention is described by detecting electric current, the resistance of the oscillation resistance that the operating frequency of above-mentioned decompression converting circuit and first oscillation resistance and second oscillation resistance constitute has a predetermined relationship.The resistance of oscillation resistance is the resistance of second oscillation resistance or first oscillation resistance and resistance after second oscillation resistance is in parallel.
The present invention proposes a kind of by detecting the device of electric current adjustment working frequency of step-down conversion circuit, and it comprises: current detection circuit and adjustable resistance module.Current detection circuit is used for judging by the size that detects the electric current that flows out decompression converting circuit the output loading state of present decompression converting circuit, and exports the control signal of adjusting working frequency of step-down conversion circuit according to the output loading state.Adjustable resistance module is coupled to decompression converting circuit and current detection circuit, is used for adjusting according to control signal the resistance of this module, adjusts the operating frequency of decompression converting circuit with this.
Adjust the device of working frequency of step-down conversion circuit according to preferred embodiment of the present invention is described by detecting electric current, above-mentioned adjustable resistance module is a potentiometer.
The present invention proposes a kind of by detecting the method for electric current adjustment working frequency of step-down conversion circuit, be used to detect central processing unit (CPU) and be in heavy duty or light condition, and when central processing unit is in light condition, be reduced to central processing unit the operating frequency of the decompression converting circuit of power supply is provided, one of its step is for providing the variable module that is coupled to decompression converting circuit.Its another step is for detecting the electric current that flows out decompression converting circuit.It also comprises step: judge the residing load condition of current central processing unit by detected electric current; And adjust the resistance of variable module according to the residing load condition of central processing unit, adjust the operating frequency of decompression converting circuit with this.
The present invention adjusts the apparatus and method of working frequency of step-down conversion circuit because of adopting by detecting electric current, therefore can judge residing underloading of central processing unit or heavy condition by detecting to central processing unit provides the electric current that the decompression converting circuit (VRD) of power supply flows out, thereby the operating frequency of decompression converting circuit is set according to the load condition of central processing unit, reach the purpose of control decompression converting circuit power consumption, can avoid unnecessary energy waste.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 illustrates a kind of structural representation of adjusting the circuit work frequency adjusting device by the step-down of detection electric current into the embodiment of the invention.
Fig. 2 illustrates a kind of concrete structural representation of adjusting the circuit work frequency adjusting device by the step-down of detection electric current into the embodiment of the invention.
Fig. 3 illustrates the concrete structural representation of adjusting the circuit work frequency adjusting device into the another kind of the embodiment of the invention by the step-down of detection electric current.
Fig. 4 illustrates the graph of a relation into oscillation resistance resistance and frequency.
Fig. 5 illustrates a kind of flow chart of adjusting the circuit work frequency method of adjustment by the step-down of detection electric current into the embodiment of the invention.
Embodiment
One of feature of the present invention is to detect decompression converting circuit (VRD) output current, thereby judge that central processing unit (CPU) is in heavy duty or light condition, to switch the operating frequency of decompression converting circuit, reach the purpose of control decompression converting circuit power consumption by convert resistance.
With reference to Fig. 1, it illustrates a kind of structural representation of adjusting the device of working frequency of step-down conversion circuit by the detection electric current into the embodiment of the invention.The device 100 that passes through to detect electric current adjustment working frequency of step-down conversion circuit of present embodiment, the size that is used to detect the electric current that flows out the decompression converting circuit 105 of powering for central processing unit 107 detects the load condition of central processing unit 107, and adjust the operating frequency of decompression converting circuit 105 by this, comprising: current detection circuit 101, variable module 103 and controller 104.Current detection circuit 101 is used for judging by the size that detects the electric current that flows out decompression converting circuit 105 load condition of present central processing unit 107, and exports the control signal of adjusting decompression converting circuit 105 operating frequencies according to load condition.Variable module 103 is coupled to decompression converting circuit 105, is used to decompression converting circuit 105 that outer meeting resistance is provided.Controller 104 is coupled to current monitoring module 101 and variable module 103, is used to receive control signal, and adjusts the resistance of variable module 103 according to control signal, adjusts the operating frequency of decompression converting circuit 105 with this.
With reference to Fig. 1 and 2, it illustrates a kind of concrete structural representation of adjusting the device of working frequency of step-down conversion circuit by the detection electric current into the embodiment of the invention.The device 100 that passes through detection electric current adjustment working frequency of step-down conversion circuit of present embodiment comprises current detection circuit 101 and variable module 103.Current detection circuit 101 is used for judging by the size that detects the electric current that flows out decompression converting circuit 105 load condition of present central processing unit 107, and exports the control signal of adjusting decompression converting circuit 105 operating frequencies according to load condition.Current detection circuit 101 comprises inductance 201, electric capacity 203 and error amplifier 205.Wherein, inductance 201 is arranged within the voltage stabilizing circuit of decompression converting circuit, and is coupled to the output of decompression converting circuit, is used for flowing through measuring current when decompression converting circuit provides power supply for central processing unit.Be connected in parallel to inductance 201 behind the electric capacity 203 series connection flow measurement resistance 207, be used to obtain the test voltage corresponding with measuring current.Error amplifier 205 has first input end, second input and output, and first input end/second input is coupled to electric capacity 203, is used to amplify test voltage.Above-mentioned error amplifier 205 can be amplified to needed value with above-mentioned test voltage by setting a particular value (multiplication factor).
See also Fig. 3, it illustrates the concrete structural representation of adjusting the device of working frequency of step-down conversion circuit into the another kind of the embodiment of the invention by the detection electric current.It comprises: current detection circuit 101 and adjustable resistance module 301.Current detection circuit 101 is used for judging by the size that detects the electric current that flows out decompression converting circuit 105 load condition of present central processing unit 107, and exports the control signal of adjusting decompression converting circuit 105 operating frequencies according to load condition.Adjustable resistance module 301 is coupled to decompression converting circuit 105 and current detection circuit 101, is used for adjusting according to control signal the resistance of this module, adjusts the operating frequency of decompression converting circuit 105 with this.Current detection circuit 101 is identical with current detection circuit among Fig. 2, repeats no more herein.Adjustable resistance module 301 is a potentiometer.
See also Fig. 4, it illustrates the graph of a relation into oscillation resistance resistance and frequency.By among the figure as can be known, when the test voltage of the output of the error amplifier 205 of above-mentioned current detection circuit 101 is enough to make transistor turns, the line conduction at transistor 209 places, first oscillation resistance 211 is in parallel with second oscillation resistance 213, and the resistance of oscillation resistance is first oscillation resistance 211 and resistance after second oscillation resistance 213 is in parallel.And when the test voltage of the output of the error amplifier 205 of above-mentioned current detection circuit 101 is not enough to turn-on transistor 209 (being that transistor is in cut-off state), the circuit at transistor 209 places disconnects, and the resistance of oscillation resistance is the resistance of second oscillation resistance 213.And the resistance of the oscillation resistance after the parallel connection is less than the resistance of unshunted oscillation resistance.By among the figure as can be known, when the resistance of oscillation resistance hour, frequency is bigger, and along with the increase of the resistance of oscillation resistance, frequency reduces gradually.According to the relation that is worn to direct ratio of frequency and VRD, therefore can control the loss of VRD by the resistance of regulating oscillation resistance.When CPU is under the light condition, adopt second oscillation resistance, the resistance of oscillation resistance increases, and frequency reduces, so loss is reduced.
It should be noted that, in the VRD part, select for use outputting inductance electric capacity and frequency (switching frequency) that certain relation is arranged, therefore when setting the underloading operating frequency, should be noted that the low limit value of operating frequency under same inductance capacitance is used, and voltage ripple need satisfy the core voltage of CPU.
With reference to Fig. 5, it illustrates a kind of flow chart of adjusting the method for working frequency of step-down conversion circuit by the detection electric current into the embodiment of the invention.The size that method of the present invention is used for detect flowing out for the electric current of the decompression converting circuit (VRD) of central processing unit (CPU) power supply detects the load condition of central processing unit, and adjusts the operating frequency of decompression converting circuit by this, may further comprise the steps:
S510: the variable module that is coupled to decompression converting circuit is provided.
S520: detect the electric current that flows out decompression converting circuit.It is specially the electric current that flows through on the inductance that detects voltage stabilizing circuit in the decompression converting circuit.
S530: judge the residing load condition of current central processing unit by detected electric current.Be specially: is voltage by the electric capacity in parallel with above-mentioned inductance with current conversion, and voltage and the voltage threshold scope of presetting are compared, and judges the current state of living in of central processing unit according to result relatively.
S540: adjust the resistance of variable module according to the residing load condition of central processing unit, adjust the operating frequency of decompression converting circuit with this.Be specially: above-mentioned variable module first oscillation resistance and second oscillation resistance of comprising, controller is a transistor, with the first oscillation resistance serial transistor, and first oscillation resistance in parallel on second oscillation resistance whether of the conduction and cut-off State Control by conversioning transistor.
In sum, adjust the device of working frequency of step-down conversion circuit by the outer meeting resistance of VRD is set of the present invention by detecting electric current, adjust the operating frequency of VRD under the different load condition of CPU, make VRD when CPU is less load, also have less operating frequency, reduce the loss of VRD when CPU is underloading.In addition, the present invention uses current detection circuit to detect by the electric current that detects VRD and the flow out present load state to CPU, and testing result is accurate, and is simple in structure, easy to operate.
Though the present invention discloses as above with preferred embodiment; right its be not to be used to limit the present invention, anyly have the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.
Claims (12)
1. one kind is passed through to detect the device that electric current is adjusted working frequency of step-down conversion circuit, comprising:
One current detection circuit, be used for judging the output loading state of this decompression converting circuit at present, and export a control signal of adjusting this working frequency of step-down conversion circuit according to the output loading state by the size that detects the electric current that flows out this decompression converting circuit;
One variable module: be coupled to this decompression converting circuit, be used to this decompression converting circuit that one outer meeting resistance is provided; And
One controller: be coupled to this current detection module and this variable module, be used to receive this control signal, and adjust the resistance of this variable module, adjust the operating frequency of this decompression converting circuit with this according to this control signal.
2. as claimed in claim 1 by detecting the device of electric current adjustment working frequency of step-down conversion circuit, it is characterized in that this current detection circuit comprises:
One inductance is arranged within the voltage stabilizing circuit of this decompression converting circuit, and is coupled to the output of this decompression converting circuit, is used for when this decompression converting circuit provides power supply for this central processing unit, a measuring current of this output that measure to obtain to flow through;
One flow measurement resistance;
One electric capacity is connected in parallel to this inductance behind this flow measurement resistance of connecting, and is used to obtain a test voltage corresponding with this measuring current; And
One error amplifier has first input end, second input and output, and first input end/second input is coupled to this electric capacity, is used to amplify this test voltage, forms this control signal.
3. as claimed in claim 1 by detecting the device of electric current adjustment working frequency of step-down conversion circuit, it is characterized in that, this variable module comprises one first oscillation resistance and one second oscillation resistance, this controller is a switching device, this switching device is connected with this first oscillation resistance, and this switching device links to each other with this current detection circuit, is used for according to this control signal conversion conducting or cut-off state, and this second oscillation resistance is in parallel with this first oscillation resistance and this switching device.
4. as claimed in claim 3 by detecting the device of electric current adjustment working frequency of step-down conversion circuit, it is characterized in that, this switching device is a transistor, this transistor has first source/drain electrode, second source/drain electrode and the grid, first source/drain electrode is coupled to this first oscillation resistance, second source/drain electrode is coupled to an earthed voltage, and grid is coupled to this current detection circuit, is used for according to this control signal conversion conducting or cut-off state.
5. as claimed in claim 3 by detecting the device of electric current adjustment working frequency of step-down conversion circuit, it is characterized in that the resistance of the oscillation resistance that the operating frequency of this decompression converting circuit and this first oscillation resistance and this second oscillation resistance constitute has a predetermined relationship.
6. as claimed in claim 5ly adjust the device of working frequency of step-down conversion circuit by detecting electric current, it is characterized in that, the resistance of this oscillation resistance is the resistance of this second oscillation resistance or this first oscillation resistance and resistance after this second oscillation resistance is in parallel.
7. one kind is passed through to detect the device that electric current is adjusted working frequency of step-down conversion circuit,
It comprises:
One current detection circuit, be used for judging the output loading state of this decompression converting circuit at present, and export a control signal of adjusting this working frequency of step-down conversion circuit according to the output loading state by the size that detects the electric current that flows out this decompression converting circuit; And
One adjustable resistance module is coupled to this decompression converting circuit and this current detection circuit, is used for adjusting according to this control signal the resistance of this module, adjusts the operating frequency of this decompression converting circuit with this.
8. as claimed in claim 7 by detecting the device of electric current adjustment working frequency of step-down conversion circuit, it is characterized in that resistance module that this is adjustable is a potentiometer.
9. as claimed in claim 7 by detecting the device of electric current adjustment working frequency of step-down conversion circuit, it is characterized in that this current detection circuit comprises:
One inductance is arranged within the voltage stabilizing circuit of this decompression converting circuit, and is coupled to the output of this decompression converting circuit, is used for when this decompression converting circuit provides power supply for this central processing unit, a measuring current of this output that measure to obtain to flow through;
One flow measurement resistance;
One electric capacity is connected in parallel to this inductance behind this flow measurement resistance of connecting, and is used to obtain a test voltage corresponding with this measuring current; And
One error amplifier has first input end, second input and output, and first input end/second input is coupled to this electric capacity, is used to amplify this test voltage, forms this control signal.
10. one kind is passed through to detect the method that electric current is adjusted working frequency of step-down conversion circuit, comprising:
A variable module that is coupled to this decompression converting circuit is provided;
Detect an electric current that flows out this decompression converting circuit;
Judge the residing output loading state of current this decompression converting circuit by detected this electric current; And adjust the resistance of this variable module according to the residing output loading state of this decompression converting circuit, adjust the operating frequency of this decompression converting circuit with this.
11. it is as claimed in claim 10 by detecting the method for electric current adjustment working frequency of step-down conversion circuit, it is characterized in that, this variable module includes one first oscillation resistance and one second oscillation resistance that is coupled to this decompression converting circuit after the parallel connection, and the step of adjusting the resistance of this variable module comprises:
A switching device that is serially connected in this first oscillation resistance is provided; And
Come conducting or end this switching device according to the residing output loading state of this decompression converting circuit.
12. as claimed in claim 11ly adjust the method for working frequency of step-down conversion circuit by detecting electric current, it is characterized in that, this method wherein, the step of adjusting the resistance of this variable module also comprises:
Detecting this electric current that flows out this decompression converting circuit, is a voltage with this current conversion, and this voltage and the voltage threshold scope of presetting are compared;
Then send a control signal that reduces this working frequency of step-down conversion circuit if surpass threshold value; And
After receiving this control signal, by this switching device.
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| CNA2007101967002A CN101453163A (en) | 2007-11-30 | 2007-11-30 | Apparatus and method for regulating working frequency of step-down conversion circuit by detection current |
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| CNA2007101967002A CN101453163A (en) | 2007-11-30 | 2007-11-30 | Apparatus and method for regulating working frequency of step-down conversion circuit by detection current |
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| CN102594123A (en) * | 2010-11-24 | 2012-07-18 | 罗姆股份有限公司 | Control circuit for switching power supply, control method, switching power supply and electronic apparatus |
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| CN103731008A (en) * | 2012-10-15 | 2014-04-16 | 联想(北京)有限公司 | Method for processing information and electronic device |
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| CN111324166B (en) * | 2018-12-14 | 2021-09-03 | 技嘉科技股份有限公司 | Power regulator and power regulation method |
| WO2022052585A1 (en) * | 2020-09-11 | 2022-03-17 | 苏州浪潮智能科技有限公司 | Buck circuit for dynamically adjusting output voltage, and dynamic adjustment method |
| CN112290810A (en) * | 2020-10-19 | 2021-01-29 | 苏州浪潮智能科技有限公司 | Circuit for realizing power saving of power supply and power supply method |
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