CN101989854B - Load driving device - Google Patents
Load driving device Download PDFInfo
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- CN101989854B CN101989854B CN 200910159032 CN200910159032A CN101989854B CN 101989854 B CN101989854 B CN 101989854B CN 200910159032 CN200910159032 CN 200910159032 CN 200910159032 A CN200910159032 A CN 200910159032A CN 101989854 B CN101989854 B CN 101989854B
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Abstract
The invention discloses a load driving device, comprising a driver and an average voltage current detector. The driver receives an input voltage and a control signal. The driver adjusts the output electric signal according to the control signal. The average voltage current detector receives the electric signal flowing to the load and compares the electric signal to a reference signal, so as to generate the control signal. In the invention, the electric signal on the load is fed back, and the electric signal is compared with the reference signal, thus adjusting output of the electric signal of the load driving device. Thus, average value of the electric signal output by the load driving device can be close to the value required by the load, and further efficiency of the load driving device is improved.
Description
Technical field
The present invention relates to a kind of load drive device.
Background technology
In the load drive device in existing technical field, the input voltage that the Chang Yinwei load drive device receives has the phenomenon of ripple (ripple), and causes its electric signal that transmits to drive load to have the phenomenon of ripple too.Thus, the electric signal that receives of load can produce not enough phenomenon and lower whole efficient.
Therefore, prior art has proposed a kind of load drive device and has solved above-mentioned problem.Please refer to Fig. 1, Figure 1 shows that the schematic diagram of existing driver.Wherein driver 110 receives input voltage VIN and transmits electric signal IV to load 120.And driver 110 is also by detecting the next foundation as dynamic adjustment electric signal IV of feedback signal FB in the load 120.
Yet, the feedback signal FB that this existing driver 110 receives is the peak value of the electric signal IV that receives of load 120 normally, but during system's design, the optimum setting value of load 120 generally is to be represented by average voltage level or average current value, therefore, aforesaid feedback controling mode does not conform with demand, may make the mean value of electric signal IV of actual driving load 120 can be lower than load 120 originally designing institutes must optimum setting value, 120 usefulness that can produce of serious reduction load.
Summary of the invention
The invention provides a kind of load drive device, its provide equals the demand of load in order to the mean value of the electric signal that drives load.
The present invention proposes a kind of load drive device, in order to export electric signal to load.Load drive device comprises driver and average voltage current sense device.Driver couples load, receives input voltage and control signal.The electric signal that driver is exported with adjustment according to control signal.Average voltage current sense device couples driver and load, receives and flow to the electric signal of load, and utilize electric signal and reference signal to compare to produce control signal.
In one embodiment of this invention, above-mentioned driver is power supply changeover device
In one embodiment of this invention, above-mentioned electric signal is drive current
In one embodiment of this invention, above-mentioned average voltage current sense device comprises current sensor, current-to-voltage convertor and comparator.Current sensor couples load, in order to the sensing drive current.Current-to-voltage convertor couples current sensor, and the drive current that senses in order to conversion is comparative voltage.Comparator couples current sensor and current-to-voltage convertor, in order to comparison reference signal and comparative voltage, and uses the generation control signal.
In one embodiment of this invention, above-mentioned current-to-voltage convertor is transfer resistance, and the one termination is received drive current, and the other end couples earthed voltage.
In one embodiment of this invention, above-mentioned comparator be computing transduction amplifier (Operational Transconductance Amplifier, OTA).
In one embodiment of this invention, load drive device also comprises reference signal generation circuit, in order to produce reference signal.Reference signal generation circuit then comprises reference current source and reference resistance.Reference current source is coupled to comparator and reference current is provided.One termination of reference resistance is received reference current and is produced reference signal, and its other end couples earthed voltage.
In one embodiment of this invention, above-mentioned current-to-voltage convertor comprises first conversion electric capacity and first change over switch.One termination of the first conversion electric capacity is received drive current, and the other end couples earthed voltage.First change over switch then couples with the first conversion electric capacity and connecting.
In one embodiment of this invention, above-mentioned load drive device comprises that also reference signal generation circuit is in order to produce reference signal.Reference signal generation circuit comprises reference current source, second conversion electric capacity and second change over switch.Reference current source is coupled to comparator, and reference current is provided.One termination of the second conversion electric capacity is received reference current, and the other end couples earthed voltage.Second change over switch and second is changed electric capacity and is connected and couples.
In one embodiment of this invention, above-mentioned electric signal is driving voltage.
In one embodiment of this invention, above-mentioned average voltage current sense device comprises first voltage current adapter, current-to-voltage convertor and comparator.First voltage current adapter couples load, in order to receive and to change driving voltage to produce switching current.Current-to-voltage convertor couples first voltage current adapter, in order to switching current is converted to comparative voltage.Comparator couples first voltage current adapter and current-to-voltage convertor, in order to comparison reference signal and comparative voltage and use the generation control signal.
In one embodiment of this invention, above-mentioned current-to-voltage convertor is transfer resistance, and the one termination is received switching current, and the other end couples earthed voltage.
In one embodiment of this invention, above-mentioned load drive device wherein also comprises reference signal generation circuit, in order to produce this reference signal.Reference signal generation circuit comprises second voltage current adapter and reference resistance.Second voltage current adapter is coupled to comparator, receives reference voltage and changes reference voltage to produce reference current.One termination of reference resistance is received reference current and is produced reference signal, and its other end couples earthed voltage.
In one embodiment of this invention, above-mentioned current-to-voltage convertor comprises first conversion electric capacity and first change over switch.One termination of the first conversion electric capacity is received drive current, and the other end couples earthed voltage.First change over switch then couples with the first conversion electric capacity and connecting
In one embodiment of this invention, above-mentioned load drive device also comprises a reference signal generation circuit, in order to produce this reference signal, comprises second voltage current adapter, second conversion electric capacity and second change over switch.Second voltage current adapter is coupled to comparator, receives reference voltage and changes reference voltage to produce reference current.One termination of the second conversion electric capacity is received reference current, and the other end couples earthed voltage.Second change over switch and second is changed electric capacity and is connected and couples.
In one embodiment of this invention, above-mentioned load drive device also comprises buffer, is serially connected in comparator and receives on the path of driving voltage.
In one embodiment of this invention, above-mentioned average voltage current sense device comprises comparator.Comparator receives driving voltage and reference signal, and comparison reference signal and driving voltage, uses the generation control signal.Wherein, reference signal is voltage signal.
Based on above-mentioned, the electric signal on the feedback load of the present invention (curtage), and electric signal and reference signal are compared, use the output of the electric signal of adjusting load drive device.Make the mean value of the electric signal that load drive device exports can be near the needed value of load, and then promote the usefulness of load drive device.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Figure 1 shows that the schematic diagram of existing driver;
Figure 2 shows that the schematic diagram of the load drive device of the first embodiment of the present invention;
Figure 3 shows that the schematic diagram of the load drive device of the second embodiment of the present invention;
Figure 4 shows that the schematic diagram of the load drive device of the third embodiment of the present invention;
Figure 5 shows that the movement oscillogram of the embodiment of Fig. 4;
Figure 6 shows that the schematic diagram of the load drive device of the fourth embodiment of the present invention;
Figure 7 shows that the schematic diagram of the load drive device of the fifth embodiment of the present invention;
Figure 8 shows that the schematic diagram of the load drive device of the sixth embodiment of the present invention.
The main element symbol description
110,210: driver; 120,230,330,430,630,830:
Load;
200: load drive device; 220,320,420,620,820: average electrical
Piezoelectricity stream detector;
310,410,610,810: power supply changeover device; 321,421: current sensor;
322,422,622: reference signal generation circuit; 323,423,623,723: current/voltage changes
Parallel operation;
621,6221: voltage current adapter; 821: buffer;
ISENSE, Iref: electric current; RST: reset signal;
CMP1: comparator; IV: electric signal;
VIN: input voltage; FB: feedback signal;
CTRL: control signal; Vref: reference signal;
R1, R2: resistance; C1～C3: electric capacity;
SW1, SW2: switch; GND: earthed voltage;
V+, V-, VR: voltage; REF: current source;
T1: time point.
Embodiment
Please refer to Fig. 2, Figure 2 shows that the schematic diagram of the load drive device of first embodiment of the invention.Wherein, load drive device 200 connects load 230 and exports electric signal IV to drive load 230.Load drive device 200 comprises driver 210 and average voltage current sense device 220.Driver 210 couples mutually with load 230 and average voltage current sense device 220, and driver 210 receives input voltage VIN and control signal CTRL.And electric signal IV is exported by driver 210, and driver 210 is adjusted the electric signal IV that it is exported according to control signal CTRL.
Average voltage current sense device 220 equally also couples with load 230, and receives electric signal IV by load 230.220 of average voltage current sense devices are to compare according to its electric signal IV that receives and reference signal, produce control signal CTRL by result relatively again.
At this, electric signal IV can be drive current or the driving voltage that drives load 230.The form of electric signal IV can be to decide for mode that current drives or voltage drive by load 230, and when load 230 is during for current drives, electric signal IV is drive current.Opposite, when load 230 is when driving for voltage, electric signal IV is driving voltage.
Note that at this above-mentioned reference signal then can set according to the value of load 230 needed electric signal IV.Be that driving voltage is example with electric signal IV, (volt, V), then reference signal can be set according to 5V, for example is set at 5V if load 230 needed optimal drive voltage are 5 volts.
Below will do introduction at the embodiment of the multi-form different load drive device of electric signal IV, and make those skilled in the art more can know understanding the present invention, and tool is to implement.
Please refer to Fig. 3, Figure 3 shows that the schematic diagram of the load drive device of second embodiment of the invention.Load drive device is made of power supply changeover device 310 and average voltage current sense device 320.Power supply changeover device 310 receives control signal CTRL and produces the electric signal IV of drive current form according to this, is used for driving load 330.Wherein, average voltage current sense device 320 comprises current sensor 321, current-to-voltage convertor 323, comparator C MP1 and reference signal generation circuit 322.
In addition, reference signal V+ can produce by reference signal generation circuit 322.In the present embodiment, reference signal generation circuit 322 comprises reference current source REF and reference resistance R2.The termination of reference resistance R2 is received the reference current Iref that reference current source REF provides, and the other end of reference resistance R2 then is connected to earthed voltage GND.When reference current passes through reference resistance R2, namely produce reference signal V+ on the end points of reference resistance R2 connection reference current source REF.
Comparator C MP1 then receives reference signal V+ and comparative voltage V-, and produces control signal CTRL according to comparison reference signal V+ and comparative voltage V-.In addition, on the end points of comparator C MP1 output control signal CTRL, can be connected in series an electric capacity of voltage regulation C1 to earthed voltage GND.In the present embodiment, comparator C MP1 utilizes operational amplifier to come construction.Certainly, comparator C MP1 also can utilize computing transduction amplifier (Operational TransconductanceAmplifier OTA) comes construction.
Can be learnt by above-mentioned explanation, changing under the situation of its control signal CTRL that produces according to reference signal V+ and comparative voltage V-via comparator C MP1, the mean value of 310 electric signals that produce according to control signal CTRL of power supply changeover device (drive current) IV just can be quite approaching with load 330 needed drive currents, makes load 330 can bring into play its maximum effect.
Then please refer to Fig. 4, Figure 4 shows that the schematic diagram of the load drive device of third embodiment of the invention.Load drive device is made of power supply changeover device 410 and average voltage current sense device 420.And power supply changeover device 410 couples load 430 and provide electric signal IV to drive load 430.Different with a last embodiment is that the average voltage current sense device 420 included current-to-voltage convertors 423 in the present embodiment are to utilize conversion capacitor C 2 and the construction of change over switch SW1 institute.Wherein change capacitor C 2 and change over switch SW1 mutually and connect, and a termination of conversion capacitor C 2 is received the drive current ISENSE that senses and its other end connects earthed voltage GND.
Change over switch SW1 then is controlled by reset signal RST, and when change over switch SW1 forms according to reset signal RST when opening circuit, conversion capacitor C 2 can receive drive current ISENSE and charge, and therefore, comparative voltage V-will raise along with the time.And when change over switch SW1 according to reset signal RST during conducting, the electric charge in the conversion capacitor C 2 will leak to earthed voltage GND, makes comparative voltage V-equal earthed voltage GND.
In addition, the reference signal generation circuit 422 in the present embodiment comprises outside the reference current source REF, also comprises conversion capacitor C 3 and change over switch SW2.Conversion capacitor C 3 and change over switch SW2 mutually and connect, and a termination of conversion capacitor C 3 is received the reference current Iref that reference current source REF produces, and its other end connection earthed voltage GND, change over switch SW2 is controlled by reset signal RST.Conversion capacitor C 3 and change over switch SW2 are identical with the manner of execution of current-to-voltage convertor 323, seldom give unnecessary details herein.
Then please refer to Fig. 5, Figure 5 shows that the movement oscillogram of Fig. 4 embodiment.Wherein when reset signal RST maintains low level, change over switch SW1, SW2 keep opening circuit, and comparative voltage V-and reference voltage V+ rose along with the time, when in case reset signal RST produces the high levle surging in time point T1, conversion capacitor C 2, C3 is sparked and comparative voltage V-and reference voltage V+ all to be reset be zero accurate position.
In addition, can be learnt by shown in Figure 5 that when comparative voltage V-was lower than reference voltage V+, expression drive current ISENSE was lower than reference current Iref.This moment, power supply changeover device 410 was heightened drive current ISENSE according to control signal CTRL.Opposite, when comparative voltage V-was higher than reference voltage V+, expression drive current ISENSE was higher than reference current Iref.This moment, power supply changeover device 410 was turned down drive current ISENSE according to control signal CTRL.Thus, the mean value of drive current ISENSE will be very near reference current Iref.
Please refer to Fig. 6, Figure 6 shows that the schematic diagram of the load drive device of the fourth embodiment of the present invention.Load drive device is made of power supply changeover device 610 and average voltage current sense device 620.Power supply changeover device 610 receives control signal CTRL and produces the electric signal IV of driving voltage form according to this, is used for driving load 630.Wherein, average voltage current sense device 620 comprises voltage current adapter 621, current-to-voltage convertor 623 and reference signal generation circuit 622.
Voltage current adapter 621 receives the electric signal IV of driving voltage forms, and conversion electric signal IV and produce switching current ISENSE.623 of current-to-voltage convertors can come construction by transfer resistance R1, and wherein the termination of transfer resistance R1 is received switching current ISENSE, and its other end connects earthed voltage GND.
622 of reference signal generation circuits comprise voltage current adapter 6221 and reference resistance R2.Voltage current adapter 6221 receives reference voltage VR and changes reference voltage VR to produce reference current Iref.The termination of reference resistance R2 is received reference current Iref, and its other end connects earthed voltage GND.
The function mode of the load drive device of this 4th embodiment is very similar to the load drive device of aforesaid second embodiment.Existing difference is to be that the electric signal IV that the power supply changeover device 610 of this 4th embodiment produces is the form of driving voltage.Therefore, in this 4th embodiment, must convert electric signal IV to switching current ISENSE by voltage current adapter 621.And the part of reference current Iref is provided, also be to utilize reference voltage VR to be provided and to obtain reference current Iref by voltage current adapter 6221 conversion reference voltage VR.And except the difference of above-mentioned explanation, illustrated all identical among the manner of execution of the load drive device of this 4th embodiment and second embodiment, seldom give unnecessary details herein.
Below please refer to Fig. 7, Figure 7 shows that the schematic diagram of the load drive device of the fifth embodiment of the present invention.The load drive device of the fifth embodiment of the present invention is identical with the load drive device of aforementioned the 4th embodiment haply.Difference be the transfer resistance R1 among the 4th embodiment in this 5th embodiment, be replaced into conversion capacitor C 2 and change over switch SW1 and connect the current-to-voltage convertor 723 of formation.And in the reference signal generation circuit, the reference resistance R2 of the 4th embodiment is replaced into conversion capacitor C 3 and change over switch SW2 at this 5th embodiment.
One termination of conversion capacitor C 2 is wherein received switching current ISENSE and its other end connection earthed voltage GND.And conversion capacitor C 3 and change over switch SW2 are mutually and connect, and a termination of conversion capacitor C 3 receives reference current Iref and its other end connects earthed voltage GND.Change over switch SW1, SW2 all are controlled by reset signal RST.About the conversion capacitor C 2, C3 and change over switch SW1, SW2 the action details in aforementioned the 3rd embodiment so that detailed explanation to be arranged, repeat no more herein.
Please refer to Fig. 8 at last, Figure 8 shows that the schematic diagram of the load drive device of the sixth embodiment of the present invention.Load drive device is made of power supply changeover device 810 and average voltage current sense device 820.Power supply changeover device 810 drives load 830 according to the electric signal IV that control signal CTRL produces the driving voltage form.Average voltage current sense device 820 comprises comparator C MP1, and comparator C MP1 can directly receive electric signal IV and reference signal Vref compares and produce control signal CTRL.At this, reference signal Vref is the voltage signal of a voltage form.
In addition, receive at comparator C MP1 on the path of electric signal IV, can also be connected in series buffer 821, in order to guarantee the stability of electric signal IV.
In sum, the present invention utilizes the electric signal on the feedback load, comes to compare with the reference signal of setting, and makes that the mean value of electric signal can be near the energy of the needed driving signal of load.Effectively promote the task performance of load.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (7)
1. load drive device in order to export drive current to a load, comprising:
One driver couples this load, receives an input voltage and a control signal, this drive current that this driver is exported with adjustment according to this control signal; And
One average current detector, couple this driver and this load, reception flow to this drive current of this load, and change this drive current and a reference current to produce a comparative voltage and a reference signal respectively, this average current detector is compared this comparative voltage and this reference signal to produce this control signal, and this average current detector comprises:
One current sensor couples this load, in order to this drive current of sensing;
One current-to-voltage convertor couples this current sensor, and this drive current that senses is converted to a comparative voltage; And
One comparator couples this current sensor and this current-to-voltage convertor, relatively this reference signal and this comparative voltage, and use and produce this control signal.
2. load drive device according to claim 1, wherein this driver is a power supply changeover device.
3. load drive device according to claim 1, wherein this current-to-voltage convertor is a transfer resistance, and the one termination is received this drive current, and the other end couples an earthed voltage.
4. load drive device according to claim 1, wherein this comparator is computing transduction amplifier.
5. load drive device according to claim 3 wherein also comprises:
One reference signal generation circuit in order to produce this reference signal, comprising:
One reference current source is coupled to this comparator, and a reference current is provided; And
One reference resistance, one termination are received this reference current and are produced this reference signal, and its other end couples this earthed voltage.
6. load drive device according to claim 3, wherein this current-to-voltage convertor comprises:
One first conversion electric capacity, the one termination is received this drive current, and the other end couples this earthed voltage; And
One first change over switch couples with parallel way mutually with this first conversion electric capacity.
7. load drive device according to claim 6 wherein also comprises:
One reference signal generation circuit in order to produce this reference signal, comprising:
One reference current source is coupled to this comparator, and a reference current is provided;
One second conversion electric capacity, the one termination is received this reference current, and the other end couples this earthed voltage; And
One second change over switch couples with parallel way mutually with this second conversion electric capacity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910159032 CN101989854B (en) | 2009-07-29 | 2009-07-29 | Load driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910159032 CN101989854B (en) | 2009-07-29 | 2009-07-29 | Load driving device |
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| CN101989854A CN101989854A (en) | 2011-03-23 |
| CN101989854B true CN101989854B (en) | 2013-07-17 |
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| CN 200910159032 Active CN101989854B (en) | 2009-07-29 | 2009-07-29 | Load driving device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357034B (en) * | 2011-09-23 | 2013-01-23 | 中国人民解放军第四军医大学 | Low-power consumption current excitation source for electrical impedance imaging |
| TWI676886B (en) * | 2018-11-05 | 2019-11-11 | 廣達電腦股份有限公司 | System loading detecting device and method |
| US10838444B1 (en) * | 2019-07-25 | 2020-11-17 | Semiconductor Components Industries, Llc | Adaptive constant current engine |
| CN110601683B (en) * | 2019-08-19 | 2023-02-10 | 麦歌恩电子(上海)有限公司 | Switch control circuit and control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1578095A (en) * | 2003-07-07 | 2005-02-09 | 罗姆股份有限公司 | Load driving device and portable apparatus utilizing such driving device |
| US7064553B2 (en) * | 2003-10-15 | 2006-06-20 | Anden Co., Ltd. | Open-circuit detecting circuit |
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2009
- 2009-07-29 CN CN 200910159032 patent/CN101989854B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1578095A (en) * | 2003-07-07 | 2005-02-09 | 罗姆股份有限公司 | Load driving device and portable apparatus utilizing such driving device |
| US7064553B2 (en) * | 2003-10-15 | 2006-06-20 | Anden Co., Ltd. | Open-circuit detecting circuit |
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