CN101515750A - Current level change protection and control device for current supply - Google Patents
Current level change protection and control device for current supply Download PDFInfo
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- CN101515750A CN101515750A CNA2008100052759A CN200810005275A CN101515750A CN 101515750 A CN101515750 A CN 101515750A CN A2008100052759 A CNA2008100052759 A CN A2008100052759A CN 200810005275 A CN200810005275 A CN 200810005275A CN 101515750 A CN101515750 A CN 101515750A
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Abstract
The invention relates to a current level change protection and control device for a current supply, which is applied to a power supply and comprises a voltage integrating unit, a current integrating unit, a pulse width modulator and a control unit, wherein the control unit connects and seizes a signal of the voltage integrating unit and comprises a comparator, a digital signal processor and a digital-simulated converter. The digital signal processor adjusts the output digital signal to the digital-simulated converter according to a signal send by the output end of the comparator; and the digital-simulated converter converts a digital working signal thereof into simulated working current to the current integrating unit. As the magnitude of the working current determines the current level for changing the fixed current mode, the current level change protection and control device has the advantages of preventing overlarge load, changing the current level and protecting the load.
Description
Technical field
What the present invention relates to is a kind of electric current level change protection control device of power supply unit, particularly be the accurate position of a kind of electric current that changes constant current mode, and then prevent load excessive with the protection load.
Background technology
Electronic equipment (as television set, sound equipment, computer, cold air and bulb etc.) all must use power supply to make its action, and power supply can be divided into alternating current and direct current, so must have AC power supply and DC power supply (or rectifier) to come the required power supply of supplies electrons equipment, and DC power supply can be divided into linear formula (Linear Power Supply, abbreviation LPS) with two kinds of switched power supplier (Switching PowerSupply is called for short SPS).Though described switched power supplier has the shortcoming that output ripple/noise is big and circuit is complicated compared with conventional linear formula power supply unit, but it is little because of having volume, in light weight, power density/conversion efficiency height, the advantage of the heat exhaustion that input voltage range is wide and less, so at power product gradually after digital development, promptly be widely adopted as the drives power supply, production development has become the indispensable key part and component of power electronic product so far, general with at information and ancillary equipment thereof, communication apparatus, the OA business machine, FA machinery, as for various fields such as people's livelihood consumer electronics, the industry interrelating effect is very big.
Yet, no matter be AC power supply or DC power supply (linear formula or switched power supplier) is in order to cooperate load operation, the capital has a voltage quasi position to set (hereinafter to be referred as Vset), in addition, excessive in order to prevent load, also or situation of short circuit takes place, can there be the accurate position of an electric current to set (hereinafter to be referred as Iset) in addition, as shown in Figure 1, described figure is the curve of general its operation of power supply unit, operating point is positioned at any point on AB and the BC straight line, and is online for deciding voltage (CV) pattern at AB, online for deciding electric current (CC) pattern at BC.
Generally speaking, the setting size of Iset be slightly larger than approximately load the maximum rated current size, work as load abnormal, when entering constant current mode, power supply unit is followed the Iset output of having set, this moment, power supply unit entered constant current mode.Under constant current mode output, the size of current that power supply unit itself and load provided and bore Iset respectively, bigger Iset output may cause unusual load damage aggravation.
And be lost in the short circuit condition under the constant current mode within its maximum of part power supply unit (linear formula power supply unit), this moment, power supply unit must bear all power consumption penalty.
Have in view of that, the inventor is based on the demand of power supply unit, being engaged in the experience accumulation that this industry designs for many years, and creates a kind of electric current level change protection control device of power supply unit, is provided with the required utilization of this industry.
Summary of the invention
Prior art shortcoming in view of the above, main purpose of the present invention provide and a kind ofly prevent that load is excessive, change the electric current level change protection control device of the accurate position of electric current and the power supply unit of protecting load.
For achieving the above object and other purpose, the invention provides a kind of electric current level change protection control device of power supply unit, is to be applied on the power supply unit, includes
One voltage integrating meter unit, be to include a first integrator is connected the first integrator output with one first diode, input by the voltage integrating meter device connects a measurement voltage signal, another input is to set control voltage in order to connect one, is electrically connected with a control unit with a pulse width modulator respectively at the end points of first diode;
One current integration unit is to include a second integral device and one second diode, is electrically connected with described pulse width modulator with the second integral device respectively at the end points of second diode;
Described pulse width modulator, be to connect voltage integrating meter unit and current integration unit, include a comparator and a waveform signal generator, described comparator can accept to be connected electrically in the signal input of voltage integrating meter unit, current integration unit and waveform signal generator; And
Described control unit includes a comparator, and connects the digital signal processor of comparator and the digital/analog converter of a linking number word signal processor, can be received the signal of voltage integrating meter unit by comparator;
So, can adjust the size of exporting digital signal, change the operating current that sends the second integral device to, and then change the accurate position of electric current of constant current mode, reach the purpose of protecting load by control unit.
Description of drawings
Shown in Figure 1 is the V-I curve synoptic diagram of general power supply unit;
Shown in Figure 2 is the circuit diagram of preferred embodiment of the present invention; And
Shown in Figure 3 is the power supply unit V-I curve synoptic diagram that preferred embodiment of the present invention changes.
Description of reference numerals: 1-voltage integrating meter unit; The 11-first integrator; The 111-negative input; The 112-electrode input end; 12-first diode; The 121-first node; The 122-Section Point; 2-current integration unit; 21-second integral device; The 211-negative input; The 212-electrode input end; 22-second diode; The 3-pulse width modulator; 31-pulse-width modulation comparator; The 311-electrode input end; The 312-negative input; The 313-output; The 32-sawtooth generator; The 4-control unit; The 41-comparator; The 411-electrode input end; The 412-negative input; The 413-output; The 42-digital signal processor; The 43-digital/analog converter.
Embodiment
Below in conjunction with accompanying drawing, be described in more detail with other technical characterictic and advantage the present invention is above-mentioned.
See also shown in Figure 2; the preferred embodiment of the electric current level change protection control device of power supply unit of the present invention; be to be applied on the power supply unit; described power supply supply is to can be DC power supply or AC power supply; described DC power supply can be linear formula (Linear Power Supply; be called for short LPS) and switched power supplier (Switching Power Supply; be called for short SPS) etc. pattern, include a voltage integrating meter unit 1, a current integration unit 2, a pulse width modulator 3 and a control unit 4.Because current circuit and the voltage circuit of power supply unit are impossible operate simultaneously, therefore regardless of being for any load, power supply unit can only be operated in described both wherein a kind of loop; Change speech, power supply unit can only be operated among constant voltage mode (CV Mode) or the constant current mode (CC Mode).Below will be illustrated at the structure and the action thereof of voltage integrating meter unit 1, a current integration unit 2, a pulse width modulator 3 and a control unit 4.
See also shown in Figure 2, above-mentioned voltage integrating meter unit 1, be to include a first integrator 11 is connected first integrator 11 outputs with one first diode 12, described first integrator 11 is to have a negative input 111 and an electrode input end 112, described negative input 111 is to measure voltage signal in order to connect one, and electrode input end 112 is to set control voltage in order to connect one.And first diode 12 is, have a first node 121 and a Section Point 122, described first node 121 is to connect first integrator 11, and Section Point 122 is to connect pulse width modulator 3, and first node 121 is to be connected control unit 4 with Section Point 122.
See also shown in Figure 2, above-mentioned current integration unit 2, be to include a second integral device 21 and one second diode 22, described second integral device 21 is to have a negative input 211 and an electrode input end 212, described negative input 211 is to connect one to measure voltage signal, and electrode input end 212 is connections and receives the signal that is transmitted by control unit 4, and second diode, 22 1 ends are the outputs that connect second integral device 21, and the other end of second diode 22 is to connect pulse width modulator 3.
See also shown in Figure 2, above-mentioned pulse width modulator 3, be to connect voltage integrating meter unit 1 and current integration unit 2, and be subjected to the control of voltage integrating meter unit 1 and current integration unit 2, include a comparator 31 and a sawtooth generator 32, described comparator 31 has an electrode input end 311, a negative input 312 and an output 313, and described electrode input end 311 is to connect first diode 12 of voltage integrating meter unit 1 and second diode 22 of current integration unit 2; And negative input 312 is to connect sawtooth generator 32, and described sawtooth generator 32 is in order to producing a sawtooth waveforms, and offers negative input 312.
When power supply unit is to be operated under the constant voltage mode, the electrode input end 311 of its pulse-width modulation comparator 31 is to receive the signal that is transmitted by voltage integrating meter unit 1, and negative input 312 is to receive the sawtooth signal that is produced by sawtooth generator 32, and compare two signals, make it export a pulse signal; And work as power supply unit is to be operated under the constant current mode, the electrode input end 311 of its pulse-width modulation comparator 31 is to receive the signal that is transmitted by current integration unit 2, and negative input 312 is to receive the sawtooth signal that is produced by sawtooth generator 32, and compare two signals, make it export a pulse signal.
Yet the aforementioned pulse signal of being exported by pulse-width modulation comparator 31 generally provides to an output power stage, and described output power stage also provides a voltage to output filter, makes output dc voltage behind the output filter filtering ripple composition.
See also shown in Figure 2, above-mentioned control unit 4, it is the signal that connects acquisition voltage integrating meter unit 1, include a comparator 41, one connects the digital signal processor 42 of comparator 41 and the digital/analog converter 43 of a linking number word signal processor 42, described comparator 41 has an electrode input end 411, one negative input 412 and an output 413, described electrode input end 411 is the Section Points 122 that connect first diode 12, and negative input 412 is the first nodes 121 that connect first diode 12, and comparator 41 is potential differences of comparison first node 121 and Section Point 122, when the current potential height of Section Point 122 during at first node 121, the output 413 of comparator 41 is to transmit certain voltage pattern (CV Mode) signal to give digital signal processor 42; And when the current potential height of first node 121 during at Section Point 121, the output 413 of comparator 41 is to transmit a constant current mode (CC Mode) signal to give digital signal processor 42, described digital signal processor 42 is constant voltage mode signal or constant current mode signals that the output 413 according to comparator 41 is transmitted, adjust the digital signal of output and give digital/analog converter 43, when constant current mode (CC Mode), described digital/analog converter 43 is to receive the digital operation signal that is transmitted by digital signal processing chip 42, and become the operating current signal of a simulation to give the second integral device 21 of above-mentioned current integration unit 2 its digital operation conversion of signals, described second integral device 21 is by the height of operating current, and then the accurate position of the electric current Iset of change constant current mode.
Moreover; because above-mentioned digital signal processor 42 can be by the size of input signal adjustment output digital signal; effectively change the operating current that sends second integral device 21 to, also therefore and then change the accurate position of the electric current Iset of constant current mode, reach the purpose of protection load.See also shown in Figure 3, when the operating current of setting changes, the accurate position of the electric current of constant current mode be with change; Detailed speech, when load takes place when unusual, its operating current will dwindle; just the accurate position of the electric current of constant current mode can be dwindled Iset and be contracted to Iset cc; and the relative output current that can make power supply unit dwindles, and with the protection load, reduces the power supply unit internal losses simultaneously.
To sum up institute is old, and embodiments of the invention really can reach the use effect of expection, has really met the important document of patent defined, files an application in accordance with the law.
The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even equivalence, but all will fall within the scope of protection of the present invention.
Claims (4)
1, a kind of electric current level change protection control device of power supply unit, it is characterized in that: it is applied on the power supply unit, and it includes:
One voltage integrating meter unit, it includes a first integrator is connected the first integrator output with one first diode, is electrically connected with a control unit with a pulse width modulator respectively at the end points of first diode;
One current integration unit, it includes a second integral device and one second diode, is electrically connected with described pulse width modulator with the second integral device respectively at the end points of second diode;
Described pulse width modulator, it connects voltage integrating meter unit and current integration unit, it includes a pulse-width modulation comparator and a waveform signal generator, and described pulse-width modulation comparator accepts to be connected electrically in the signal input of voltage integrating meter unit, current integration unit and a waveform signal generator; And
Described control unit, it includes a comparator, and connects the digital signal processor of comparator and the digital/analog converter of a linking number word signal processor, is received the signal of voltage integrating meter unit by comparator;
When load takes place when unusual, the size by control unit adjustment output digital signal changes the operating current that sends the second integral device to, and then changes the accurate position of electric current of constant current mode, protection load.
2, the electric current level change protection control device of power supply unit according to claim 1; it is characterized in that: the electrode input end of described pulse-width modulation comparator is to receive the signal that is transmitted by current integration unit or voltage integrating meter unit, and negative input is the sawtooth signal that receives by sawtooth generator produced.
3, the electric current level change protection control device of power supply unit according to claim 1 is characterized in that: described power supply is supplied as at least a in DC power supply and the AC power supply.
4, the electric current level change protection control device of power supply unit according to claim 3 is characterized in that: described DC power supply is linear formula and switched power supplier pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100052759A CN101515750B (en) | 2008-02-20 | 2008-02-20 | Current level change protection and control device for current supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100052759A CN101515750B (en) | 2008-02-20 | 2008-02-20 | Current level change protection and control device for current supply |
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| Publication Number | Publication Date |
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| CN101515750A true CN101515750A (en) | 2009-08-26 |
| CN101515750B CN101515750B (en) | 2011-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100052759A Active CN101515750B (en) | 2008-02-20 | 2008-02-20 | Current level change protection and control device for current supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913648A (en) * | 2013-01-07 | 2014-07-09 | 致茂电子(苏州)有限公司 | Direct-current power supply unit and relevant photovoltaic inverter testing system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023541A (en) * | 1990-03-23 | 1991-06-11 | Hewlett-Packard Company | Power supply control circuit having constant voltage and constant current modes |
| KR970055044A (en) * | 1995-12-05 | 1997-07-31 | 김광호 | Battery charger supports multiple charging methods |
| CN1083627C (en) * | 1997-09-26 | 2002-04-24 | 台达电子工业股份有限公司 | Uninterruption power source system and its charge control method |
| US6100667A (en) * | 1999-01-21 | 2000-08-08 | National Semiconductor Corporation | Current-to-voltage transition control of a battery charger |
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2008
- 2008-02-20 CN CN2008100052759A patent/CN101515750B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913648A (en) * | 2013-01-07 | 2014-07-09 | 致茂电子(苏州)有限公司 | Direct-current power supply unit and relevant photovoltaic inverter testing system |
| CN103913648B (en) * | 2013-01-07 | 2016-07-06 | 致茂电子(苏州)有限公司 | DC power supply and relevant photovoltaic inverter test system |
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| Publication number | Publication date |
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| CN101515750B (en) | 2011-05-25 |
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