CN103178716A - Voltage generator with large dynamic range and voltage generation method - Google Patents
Voltage generator with large dynamic range and voltage generation method Download PDFInfo
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Abstract
The invention discloses a voltage generator with a large dynamic range and a voltage generation method. The voltage generator comprises a transformer, a switching crystal circuit, a rectifying circuit, an adjustable voltage division circuit and a feedback circuit. The switching transistor switches a primary side coil voltage of the transformer using a source voltage according to the modulation signal. The input end of the rectifying circuit is coupled to the secondary side coil of the transformer. The output end of the rectifying circuit provides a target voltage. The input end of the adjustable voltage division circuit is coupled to the output end of the rectification circuit. The output end of the adjustable voltage division circuit provides feedback voltage. The voltage division ratio of the adjustable voltage division circuit is controlled by a control signal. The input end of the feedback circuit is coupled to the output end of the adjustable voltage division circuit. The feedback circuit compares the feedback voltage with the reference voltage and adjusts the modulation signal according to the comparison result. Based on the scheme, the dynamic range of the target voltage can be improved by adjusting the voltage division ratio of the voltage division circuit and/or adjusting the voltage amplitude of the voltage source.
Description
Technical field
The invention relates to a kind of voltage generator, and particularly relevant for a kind of high voltage generator of great dynamic range.
Background technology
The tradition direct current can be fixing output voltage with different voltage level conversion to DC voltage converting circuit.Yet, need to do with input voltage level the application of linear transformation for some VD, as the voltage generator in the electrostatic test system, traditional direct current can't provide the high voltage of this great dynamic range to DC voltage converting circuit.Take the electrostatic test system as example, the voltage output range of its voltage generator must satisfy 80 volts of continuous adjustable voltages to 8000 volts of ceiling voltages of minimum direct current voltage.The conventional voltage generator can't provide the voltage of this great dynamic range.
The conventional voltage generator is mainly used in the fixedly conversion of output voltage, so the voltage adjustment of output only needs can meet demand ten times of scopes with interior.For example, 24 volts of input voltages and output voltage are fixed in the buck converter of 5 volts, and the work period of its internal pulses bandwidth modulation signals, (duty ratio) was designed in 10% to 80% scope.Yet, (the output voltage adjusting range need reach more than hundred times for some application that needs great dynamic range, as approximately 80 volts of minimum output voltages, and maximum output voltage must reach 8000 volts), use the pulse width modulation of conventional voltage generator can't satisfy this demand.
Summary of the invention
The invention provides a kind of voltage generator and voltage generating method of great dynamic range, use pulse width modulating technology and amplitude-modulation techniques to improve the output voltage adjustable range, to satisfy the demand of great dynamic range.
The embodiment of the present invention proposes a kind of voltage generator of great dynamic range, comprises transformer, switches crystal circuit, rectification circuit, adjustable voltage division circuit and feedback circuit.Transformer has first siding ring (primary winding) and second siding ring (secondary winding) at least.Switch the first siding ring that the crystal circuit is coupled to transformer.Switching the crystal circuit uses source voltage to drive first siding ring according to modulation signal.The input of rectification circuit is coupled to the second siding ring of transformer.The output of rectification circuit provides the output of target voltage as this voltage generator.The input of adjustable voltage division circuit is coupled to the output of rectification circuit.The output of adjustable voltage division circuit provides feedback voltage, and wherein the partial pressure ratio of adjustable voltage division circuit is controlled by the first control signal.The input of feedback circuit is coupled to the output of adjustable voltage division circuit.The output of feedback circuit provides modulation signal to switching the crystal circuit, and wherein feedback circuit compares feedback voltage and reference voltage, and adjusts this modulation signal according to comparative result.
The embodiment of the present invention proposes a kind of voltage generating method of great dynamic range.This voltage generating method comprises: a transformer is provided, and this transformer has first siding ring and second siding ring at least; Provide one to switch the crystal current road, this switching crystal circuit is coupled to the first siding ring of this transformer; Use a source voltage to drive this first siding ring by this switching crystal circuit according to a modulation signal; One rectification circuit is provided, and the input of this rectification circuit is coupled to the second siding ring of this transformer; Output by this rectification circuit provides the output of a target voltage as this voltage generator; One adjustable voltage division circuit is provided, and the input of this adjustable voltage division circuit is coupled to the output of this rectification circuit; Output by this adjustable voltage division circuit provides a feedback voltage, and wherein the partial pressure ratio of this adjustable voltage division circuit is controlled by one first control signal; One feedback circuit is provided, and the input of this feedback circuit is coupled to the output of this adjustable voltage division circuit; By this feedback circuit relatively this feedback voltage and a reference voltage, and adjust this modulation signal according to comparative result, to provide this modulation signal to this switching crystal circuit; One variable voltage source is provided, and the output of this variable voltage source is coupled to this switching crystal circuit; And adjust this source voltage by this variable voltage source according to one second control signal, to provide this source voltage to this switching crystal circuit.
The embodiment of the present invention proposes a kind of voltage generator of great dynamic range, comprises transformer, switches crystal circuit, variable voltage source, rectification circuit and feedback circuit.Transformer has first siding ring and second siding ring at least.Switch the first siding ring that the crystal circuit is coupled to transformer.Switching the crystal circuit uses source voltage to drive first siding ring according to modulation signal.The output of variable voltage source is coupled to and switches the crystal circuit so that this source voltage to be provided, and wherein this variable voltage source is adjusted this source voltage according to control signal.The input of rectification circuit is coupled to the second siding ring of transformer.The output of rectification circuit provides the output of target voltage as this voltage generator.The input of feedback circuit is coupled to the output of rectification circuit.The output of feedback circuit provides modulation signal to switching the crystal circuit, and wherein this feedback circuit is adjusted this modulation signal according to this target voltage.
The embodiment of the present invention proposes a kind of voltage generating method of great dynamic range.This voltage generating method comprises: a transformer is provided, and this transformer has first siding ring and second siding ring at least; Provide one to switch the crystal current road, this switching crystal circuit is coupled to the first siding ring of this transformer; Use a source voltage to drive this first siding ring by this switching crystal circuit according to a modulation signal; One variable voltage source is provided, and the output of this variable voltage source is coupled to this switching crystal circuit; Adjust this source voltage by this variable voltage source according to a control signal, to provide this source voltage to this switching crystal circuit; One rectification circuit is provided, and the input of this rectification circuit is coupled to the second siding ring of this transformer; Output by this rectification circuit provides the output of a target voltage as this voltage generator; One feedback circuit is provided, and the input of this feedback circuit is coupled to the output of this rectification circuit; And provide this modulation signal to this switching crystal circuit by the output of this feedback circuit, wherein this feedback circuit is adjusted this modulation signal according to this target voltage.
Based on above-mentioned, the partial pressure ratio of the embodiment of the present invention by adjusting bleeder circuit with and/or be the voltage amplitude of adjusting voltage source, to improve the dynamic range of target voltage.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and coordinate appended accompanying drawing to be described in detail below.
Description of drawings
Fig. 1 is the function block schematic diagram according to the voltage generator of a kind of great dynamic range of embodiment of the present invention explanation.
Fig. 2 is the function block schematic diagram according to the voltage generator of a kind of great dynamic range of another embodiment of the present invention explanation.
Fig. 3 is another example circuit diagram of explanation rectification circuit shown in Figure 1.
Fig. 4 is the function block schematic diagram according to the voltage generator of a kind of great dynamic range of further embodiment of this invention explanation.
[main element symbol description]
100,400,500: voltage generator;
110: switch the crystal circuit;
111: wire;
112: switching transistor;
141～143,411～413: switch;
120: transformer;
121: first siding ring;
122: second siding ring;
130: rectification circuit;
140: adjustable voltage division circuit;
150,510: feedback circuit;
151: error amplifier;
152: the pulse width modulation module;
410: variable voltage source;
511: bleeder circuit;
C1, Ci, Co: electric capacity;
D1, D2: diode;
Ru, Rd, Rd1, Rd2, Rd3: resistance;
S1～S6: switching signal;
Sc1, Sc2: control signal;
Sm: modulation signal;
VDC1～VDC3: direct voltage;
Vfb: feedback voltage;
Vout: target voltage;
Vref: reference voltage;
Vs: source voltage.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is the function block schematic diagram according to the voltage generator 100 of a kind of great dynamic range of embodiment of the present invention explanation.Voltage generator 100 comprises switching crystal circuit 110, transformer 120, rectification circuit 130, adjustable voltage division circuit 140 and feedback circuit 150.Switch the first siding ring (primary winding) 121 that crystal circuit 110 is coupled to transformer 120.According to the control of modulation signal Sm, switch crystal circuit 110 and use source voltage Vs to drive first siding ring 121.The input of rectification circuit 130 is coupled to the second siding ring (secondary winding) 122 of transformer 120.The output of rectification circuit 130 provides the output of target voltage Vout as voltage generator 100.In certain embodiments, rectification circuit 130 can rectification and the output of the second siding ring 122 of this transformer 120 of multiplication of voltage, so that target voltage Vout to be provided.
The input of adjustable voltage division circuit 140 is coupled to the output of rectification circuit 130.The output of adjustable voltage division circuit 140 provides feedback voltage Vfb.Wherein, the partial pressure ratio of adjustable voltage division circuit 140 is controlled by the first control signal Sc1.For example, according to the control of the first control signal Sc1, the upper resistance of adjustable voltage division circuit 140 and the resistance value ratio Ru of lower resistance: Rd can be adjusted to 1000: 1,500: 1,125: 1 or other ratios.The input of feedback circuit 150 is coupled to the output of adjustable voltage division circuit 140.The output of feedback circuit 150 provides modulation signal Sm to switching crystal circuit 110.Wherein, feedback circuit 150 is feedback voltage Vfb and reference voltage Vref relatively, and adjusts modulation signal Sm according to comparative result.
For keeping the stability of export target voltage Vout, adjustable voltage division circuit 140 can be according to the first control signal Sc1 sampling target voltage Vout, and sampling result (feedback voltage Vfb) is fed back to feedback circuit 150.Feedback circuit 150 is made comparisons feedback voltage Vfb and reference voltage Vref, and adjusts modulation signal Sm according to comparative result.Modulation signal Sm controls conducting and the shut-in time of switching crystal circuit 110 internal switches.So, voltage generator 100 just can keep the stability of export target voltage Vout.In the present embodiment, by changing above-mentioned the first control signal Sc1, the dynamic range that voltage generator 100 can export target voltage Vout.
Fig. 2 is the example circuit diagram of explanation voltage generator 100 shown in Figure 1.Execution mode shown in Figure 2 can be with reference to the related description of Fig. 1.Please refer to Fig. 2, the present embodiment is realized voltage generator 100 with the flyback framework.Switch crystal circuit 110 and comprise wire 111 and switching transistor 112.The first end receipt source voltage Vs of wire 111.The second end of wire 111 is coupled to the first end of the first siding ring 121 of transformer 120.The first end of switching transistor 112 is coupled to the second end of the first siding ring 121 of transformer 120.The second end ground connection of switching transistor 112.The control end of switching transistor 112 is coupled to feedback circuit 150, to receive modulation signal Sm.The quick On/Off switching transistor 112 of modulation signal Sm makes direct current source voltage Vs can be converted to AC signal.The energy of the AC signal of corresponding modulating first siding ring 121 size by changing modulation signal Sm.
Turn ratio Ns according to transformer 120: Np, transformer 120 can be converted to the AC signal that peak swing in first siding ring 121 is Vp that in second siding ring 122, peak swing is the AC signal of Ns * Vp/Np.The anode of the diode D1 of rectification circuit 130 is coupled to the first end of the second siding ring 122 of transformer 120.The negative electrode of diode D1 is as the output of rectification circuit 130.Therefore, after the AC signal of rectification circuit 130 rectification second siding rings 122, export required direct voltage Vout.The first end of the capacitor C 1 of rectification circuit 130 is coupled to the negative electrode of diode D1.The second end of capacitor C 1 is coupled to the second end of the second siding ring 122 of transformer 120.Capacitor C 1 can filtering voltage Vout AC noise, improve the stability of target voltage Vout.
In the present embodiment, the first control signal Sc1 comprises the first switching signal S1, second switch signal S2 and the 3rd switching signal S2.Adjustable voltage division circuit 140 comprises resistance Ru, the first switch 141, second switch 142, the 3rd switch 143, first time resistance R d1, second time resistance R d2 and the 3rd time resistance R d3.The first end of upper resistance Ru is coupled to the output of rectification circuit 130.The second end of upper resistance Ru is as the output of adjustable voltage division circuit 140.The first end of the first switch 141, second switch 142 and the 3rd switch 143 is coupled to the second end of resistance Ru.The control end of the first switch 141 receives the first switching signal S1, and the second end of the first switch 141 is coupled to the first end of first time resistance R d1.The control end of second switch 142 receives second switch signal S2, and the second end of second switch 142 is coupled to the first end of second time resistance R d2.The control end of the 3rd switch 143 receives the 3rd switching signal S3, and the second end of the 3rd switch 143 is coupled to the first end of the 3rd time resistance R d3.The second end of first time resistance R d1, second time resistance R d2 and the 3rd time resistance R d3 is coupled to the second end of the second siding ring 122 of transformer 120.Wherein, the resistance of first time resistance R d1, second time resistance R d2 and the 3rd time resistance R d3 is different.
By determining the conducting state of the first switch 141, second switch 142 and the 3rd switch 143, can change the upper resistance of adjustable voltage division circuit 140 and the resistance value ratio Ru of lower resistance: Rd, for example 1000: 1,500: 1,125: 1 or other ratios.Though in Fig. 2, lower resistance R d has illustrated resistance R d1, Rd2 and Rd3 under three groups, and upper resistance Ru only illustrates resistance on one group, yet the implementation of adjustable voltage division circuit 140 is not limited to this.For example, lower resistance R d can by resistance R d1, Rd2 under two groups and switch 141,142 consist of, or consisted of with up and down resistance and switch by four groups.In like manner can push away, upper resistance Ru can be made of resistance on many groups and switch.Therefore, the first control signal Sc1 can be with the upper resistance of adjustable voltage division circuit 140 and the resistance value ratio Ru of lower resistance: Rd changes into any ratio.
In the present embodiment, feedback circuit 150 comprises error amplifier (error amplifier) 151 and pulse width modulation (pulse width modulation, PWM) module 152.The first input end of error amplifier 151 is coupled to the output of adjustable voltage division circuit 140, to receive feedback voltage Vfb.The second input of error amplifier 151 is coupled to reference voltage Vref.The input of pulse width modulation module 152 is coupled to the output of error amplifier 151.The output of pulse width modulation module 152 is coupled to and switches crystal circuit 110, so that modulation signal Sm to be provided.Wherein, pulse width modulation module 152 is adjusted the pulse duration of modulation signal Sm accordingly according to the output of error amplifier 151.
By determining the conducting state of the first switch 141, second switch 142 and the 3rd switch 143, can change the upper resistance of adjustable voltage division circuit 140 and the resistance value ratio Ru of lower resistance: Rd, for example 1000: 1,500: 1 or 125: 1.The feedback voltage Vfb of adjustable voltage division circuit 140 is delivered to pulse width modulation module 152 by error amplifier 151.According to the error size of feedback voltage Vfb and reference voltage Vref, pulse width modulation module 152 is controlled switching transistor 112 conductings and shut-in time, so just can keep the stability of export target voltage Vout.Through the present embodiment framework, target voltage Vout can set via the first control signal Sc1, and the adjustable dynamic range of export target voltage Vout can reach hundred times.
At the variable voltage source 410 that also comprises embodiment illustrated in fig. 2.Please refer to Fig. 2, the output of variable voltage source 410 is coupled to and switches crystal circuit 110, so that source voltage Vs to be provided.Wherein, variable voltage source 410 is adjusted source voltage Vs according to the second control signal Sc2.In the present embodiment, the second control signal Sc2 comprises switching signal S4, S5 and S6.Variable voltage source 410 comprises switch 411,412 and 413.The first end of switch 411 receives the first direct voltage VDC1.The control end receiving key signal S1 of switch 411.The first end of switch 412 receives the second direct voltage VDC2.The control end receiving key signal S2 of switch 412.The first end of switch 413 receives the 3rd direct voltage VDC3.The control end receiving key signal S3 of switch 413.Switch 411, the second end of 412 and 413 are coupled to the output of variable voltage source 410.Wherein, the first direct voltage VDC1, the second direct voltage VDC2 and the 3rd direct voltage VDC3 are different.For example, the first direct voltage VDC1 is 2V, and the second direct voltage VDC2 is 8V, and the 3rd direct voltage VDC3 is 16V.
The present embodiment adds several analog switches at the primary side 121 of transformer 120, in order to select and the amplitude that changes the alternating voltage that enters transformer 120 primary sides 121.The present embodiment adds adjustable voltage division circuit 140 at the feedback path of export target voltage Vout simultaneously, in order to select and the sampling scope that changes feedback voltage Vfb.Please refer to Fig. 2, by switching signal S4, S5 and S6 can control switch 411,412,413 conducting state, and then select direct voltage VDC1, VDC2 or VDC3 to enter transformer 120 primary sides 121.Switch crystal circuit 110 and will drive first siding ring 121 according to source voltage Vs and modulation signal Sm.
Suppose that when variable voltage source 410 was selected direct voltage VDC1, VDC2 or VDC3, the peak swing that switching crystal circuit 110 exports the AC signal of first siding ring 121 to was respectively Vp1, Vp2 or Vp3.(Ns for example: Np), the peak swing of the AC signal of second siding ring 122 is Ns * Vp1/Np or Ns * Vp2/Np or Ns * Vp3/Np according to the turn ratio of transformer 120.This AC signal is exported required direct current target voltage Vout via rectification circuit 130 rectifications/multiplication of voltage.For keeping the stability of target voltage Vout, it is Rd1, Rd2 or Rd3 that target voltage Vout selects divider resistance according to output voltage range through several control switchs 141,142 or 143.Adjustable voltage division circuit 140 sampling target voltage Vout also export feedback voltage Vfb to error amplifier 151 inputs.According to the error size of error amplifier 151 outputs, pulse width modulation module 152 is controlled switching transistor 112 conductings and shut-in time.So, voltage generator 400 can keep the stability of output voltage.Through this embodiment framework, voltage generator 400 can be via the adjustment of control signal Sc1, control signal Sc2 and/or reference voltage Vref target setting voltage Vout, and the adjustable dynamic range of target voltage Vout can reach hundred times.
In Fig. 2, the method for designing of voltage generator 400 can be with reference to following explanation.At first determine to switch the topological classification of crystal circuit 110, for example flyback, push-pull type, forward type, semibridge system, full-bridge type or other topological classifications.The transfer function of various topological classifications is as follows:
Flyback:
Forward type:
Push-pull type:
Semibridge system:
Full-bridge type:
Said n represents the multiplication of voltage ratio of rectification circuit 130, the number of turn of Ns indication transformer secondary side 122, and the number of turn of Np indication transformer primary side 121, and D represents on-state rate or the work period (duty ratio) of modulation signal Sm.Above-mentioned V
OUT_OLBe illustrated in out under the condition in loop, namely under the condition with the line temporarily disconnected between adjustable voltage division circuit 140 and rectification circuit 130, the export target voltage Vout of voltage generator 400.
Suppose selected push-pull type topological classification realization switching crystal circuit 110.The multiplication of voltage ratio n of another hypothesis rectification circuit 130 is 2, and the turn ratio Ns of transformer 120: Np is 100: 1.Opening under the condition in loop the work period D of modulation signal Sm and the output V of voltage generator 400
OUT_OLRelation calculate in table 1, table 2 and table 3.When the source voltage Vs of variable voltage source 410 outputs is 2V, the work period D of modulation signal Sm and the output V of voltage generator 400
OUT_OLRelation as shown in table 1.When the source voltage Vs of variable voltage source 410 outputs is 8V, the work period D of modulation signal Sm and the output V of voltage generator 400
OUT_OLRelation as shown in table 2.When the source voltage Vs of variable voltage source 410 outputs is 16V, the work period D of modulation signal Sm and the output V of voltage generator 400
OUT_OLRelation as shown in table 3.
Table 1
Table 2
Table 3
Result of calculation by table 1, table 2 and table 3 can be verified, opening under the loop, if direct voltage VDC1 is 2V, and the output V of voltage generator 400
OUT_OLDynamic range be 80V to 720V.If direct voltage VDC2 is 8V, the output V of voltage generator 400
OUT_OLDynamic range be 320V to 2880V.If direct voltage VDC3 is 16V, the output V of voltage generator 400
OUT_OLDynamic range be 640V to 5760V.These three out-put dynamic ranges overlap to each other.
Next, select separately the loop circuit output voltage values with regard to above-mentioned three out-put dynamic ranges.The dynamic range of loop circuit output voltage values is required to be out the subclass of the dynamic range of output voltage loop value.According to the design requirement of actual product, for example, for the above-mentioned output voltage loop V that opens
OUT_OLDynamic range 80V to 720V, select the lower limit Vout of the dynamic range of loop circuit export target magnitude of voltage Vout
(MIN)With upper limit Vout
(MAX)Be respectively 87.5V and 625V, as shown in table 4.By that analogy, for the above-mentioned output voltage loop V that opens
OUT_OLDynamic range 320V to 2880V, select lower limit Vout
(MIN)With upper limit Vout
(MAX)Be respectively 350V and 2500V.For the above-mentioned output voltage loop V that opens
OUT_OLDynamic range 320V to 2880V, select lower limit Vout
(MIN)With upper limit Vout
(MAX)Be respectively 700V and 5000V.
Table 4
Next, according to the lower limit Vout of the dynamic range of the loop circuit output voltage values of each group
(MIN)With upper limit Vout
(MAX), upper resistance and the resistance value ratio Ru of lower resistance: the Rd of setting adjustable voltage division circuit 140.The calculation equation of bleeder circuit is:
Vout＝Vref×(Ru+Rd)/Rd
The result of calculation of aforesaid equation is illustrated in table 5, table 6 and table 7.Table 5 explanation approximately slightly during 0.7～5V, is 87.5～625V if want realize target magnitude of voltage Vout dynamic range when the adjusting range of reference voltage Vref, and the resistance that goes up resistance Ru is 1M Ω, and the resistance of time resistance R d is 8K Ω.Table 6 explanation approximately slightly during 0.7～5V, is 350～2500V if want realize target magnitude of voltage Vout dynamic range when the adjusting range of reference voltage Vref, and the resistance that goes up resistance Ru is 1M Ω, and the resistance of time resistance R d is 2K Ω.Table 7 explanation approximately slightly during 0.7～5V, is 700～5000V if want realize target magnitude of voltage Vout dynamic range when the adjusting range of reference voltage Vref, and the resistance that goes up resistance Ru is 1M Ω, and the resistance of time resistance R d is 1K Ω.
Table 5
Table 6
Table 7
Via above-mentioned method for designing, can determine the voltage level of direct voltage VDC1, VDC2 and VDC3 in voltage generator 400, also can determine the upper resistance of adjustable voltage division circuit 140 and the resistance value ratio Ru of lower resistance: Rd.
The implementation of rectification circuit 130 shown in Figure 2 is only example.In other embodiments, rectification circuit 130 can otherwise be realized.For example, rectification circuit 130 can be full-bridge type rectification circuit and/or voltage-multiplying circuit.Described voltage-multiplying circuit comprises charge pump (charge pump) or other booster circuits.For example, Fig. 3 is another example circuit diagram of explanation rectification circuit 130 shown in Figure 1.Please refer to Fig. 3, rectification circuit 130 comprises input capacitance Ci, output capacitance Co, the first diode D1 and the second diode D2.The first end of input capacitance Ci is coupled to the first end of the second siding ring 122 of transformer 120.The negative electrode of the first diode D1 is coupled to the second end of input capacitance Ci.The anode of the first diode D1 is coupled to the second end of the second siding ring 122 of transformer 120.The anode of the second diode D2 is coupled to the second end of input capacitance Ci.The negative electrode of the second diode D2 is as the output of rectification circuit 130.The first end of output capacitance Co is coupled to the negative electrode of the second diode D2.The second end of output capacitance Co is coupled to the second end of the second siding ring 122 of transformer 120.
When the AC of second siding ring 122 signal was negative half-cycle, the peak swing of supposing this AC signal was Am, due to the first diode D1 for being reverse blas along bias voltage the second diode D2, so input capacitance Ci stored voltage Am approximately slightly.When the AC of second siding ring 122 signal was positive half period, the first diode D1 was reverse blas, so the mutual superposition of stored voltage of this AC signal and capacitor C i.Because the second diode D2 is along bias voltage, this superposition voltage (being Am+Am) can be stored to output capacitance Co via the second diode D2.Therefore, the direct current target voltage Vout that provides of the output of rectification circuit 130 (i.e. the negative electrode of the second diode D2) 2Am approximately slightly.
Fig. 4 is the function block schematic diagram according to the voltage generator 500 of a kind of great dynamic range of further embodiment of this invention explanation.Voltage generator 500 comprises variable voltage source 410, switches crystal circuit 110, transformer 120, rectification circuit 130 and feedback circuit 510.The output of variable voltage source 410 is coupled to and switches crystal circuit 110, so that source voltage Vs to be provided.Variable voltage source 410 is adjusted source voltage Vs according to control signal Sc2.Switch the first siding ring 121 that crystal circuit 110 is coupled to transformer 120.Switching crystal circuit 110 uses source voltage Vs to drive first siding ring 121 according to modulation signal Sm.The input of rectification circuit 130 is coupled to the second siding ring 122 of transformer 120.The output of rectification circuit 130 provides the output of target voltage Vout as voltage generator 500.The input of feedback circuit 510 is coupled to the output of rectification circuit 130.The output of feedback circuit 510 provides modulation signal Sm to switching crystal circuit 110.Wherein, feedback circuit 510 is adjusted modulation signal Sm according to target voltage Vout.
In the present embodiment, feedback circuit 510 comprises bleeder circuit 511, error amplifier 151 and pulse width modulation module 152.The input of bleeder circuit 511 is coupled to the output of rectification circuit 130.The output of bleeder circuit 511 provides feedback voltage Vfb.The first input end of error amplifier 151 is coupled to the output of bleeder circuit 511 to receive feedback voltage Vfb.The second input of error amplifier 151 is coupled to reference voltage Vref.The input of pulse width modulation module 152 is coupled to the output of error amplifier 151.The output of pulse width modulation module 152 is coupled to and switches crystal circuit 110 so that modulation signal Sm to be provided.Wherein, pulse width modulation module 152 is adjusted the pulse duration of modulation signal Sm accordingly according to the output of error amplifier 151.
Execution mode shown in Figure 4 can be with reference to the related description of Fig. 1 and Fig. 2.Be different from part embodiment illustrated in fig. 2, be to go up in middle bleeder circuit 511 embodiment illustrated in fig. 4 resistance Ru and descend resistance R d to have the fixed resistance value.The first end of upper resistance Ru is coupled to the output of rectification circuit 130.The second end of upper resistance Ru is as the output of bleeder circuit 511.The first end of lower resistance R d is coupled to the second end of resistance Ru.The second end of lower resistance R d is coupled to the second end of the second siding ring 122 of transformer 120.That is to say, the resistance value ratio Ru of the bleeder circuit 511 of the present embodiment: Rd is fixed resistance value.
In sum, the partial pressure ratio of above-mentioned all embodiment by adjusting bleeder circuit with and/or be the voltage amplitude of adjusting voltage source, make voltage generator can improve the dynamic range of target voltage.
Although the present invention with embodiment openly as above; so it is not to limit the present invention; those of ordinary skill in technical field under any; without departing from the spirit and scope of the present invention; when change and the modification that can make part, so protection scope of the present invention is as the criterion when looking the claim person of defining.
Claims (23)
1. the voltage generator of a great dynamic range, is characterized in that, comprising:
Transformer has first siding ring and second siding ring at least;
Switch the crystal circuit, be coupled to the first siding ring of this transformer, this switching crystal circuit uses source voltage to drive this first siding ring according to a modulation signal;
Rectification circuit, its input is coupled to the second siding ring of this transformer, and the output of this rectification circuit provides the output of target voltage as this voltage generator;
Adjustable voltage division circuit, its input is coupled to the output of this rectification circuit, and the output of this adjustable voltage division circuit provides feedback voltage, and wherein the partial pressure ratio of this adjustable voltage division circuit is controlled by the first control signal;
Feedback circuit, its input is coupled to the output of this adjustable voltage division circuit, the output of this feedback circuit provides this modulation signal to this switching crystal circuit, relatively this feedback voltage and reference voltage of this feedback circuit wherein, and adjust this modulation signal according to comparative result; And
Variable voltage source, its output are coupled to this switching crystal circuit so that this source voltage to be provided, and wherein this variable voltage source is adjusted this source voltage according to the second control signal.
2. the voltage generator of great dynamic range according to claim 1, it is characterized in that, this switching crystal circuit is flyback power-switching circuit, push-pull type power-switching circuit, forward type power-switching circuit, semibridge system power-switching circuit or full-bridge type power-switching circuit.
3. the voltage generator of great dynamic range according to claim 1, is characterized in that, this switching crystal circuit comprises:
Wire, its first end receive this source voltage, and the second end of this wire is coupled to the first end of the first siding ring of this transformer; And
Switching transistor, its first end are coupled to the second end of the first siding ring of this transformer, the second end ground connection of this switching transistor, and the control end of this switching transistor is coupled to this feedback circuit to receive this modulation signal.
4. the voltage generator of great dynamic range according to claim 1, is characterized in that, this rectification circuit comprises:
Diode, its anode is coupled to the first end of the second siding ring of this transformer, and the negative electrode of this diode is as the output of this rectification circuit; And
Electric capacity, its first end is coupled to the negative electrode of this diode, and the second end of this electric capacity is coupled to the second end of the second siding ring of this transformer.
5. the voltage generator of great dynamic range according to claim 1, is characterized in that, the output of the second siding ring of this rectification circuit rectification and this transformer of multiplication of voltage is to provide this target voltage.
6. the voltage generator of great dynamic range according to claim 1, is characterized in that, this first control signal comprises the first switching signal and second switch signal, and this adjustable voltage division circuit comprises:
Upper resistance, its first end is coupled to the output of this rectification circuit, and on this, the second end of resistance is as the output of this adjustable voltage division circuit;
The first switch, its first end are coupled to the second end of resistance on this, and the control end of this first switch receives this first switching signal;
First time resistance, its first end are coupled to the second end of this first switch, and the second end of this first time resistance is coupled to the second end of the second siding ring of this transformer;
Second switch, its first end are coupled to the second end of resistance on this, and the control end of this second switch receives this second switch signal; And
Second time resistance, its first end are coupled to the second end of this second switch, and the second end of this second time resistance is coupled to the second end of the second siding ring of this transformer;
Wherein the resistance of this first time resistance is different from the resistance of this second time resistance.
7. the voltage generator of great dynamic range according to claim 1, is characterized in that, this feedback circuit comprises:
Error amplifier, its first input end are coupled to the output of this adjustable voltage division circuit to receive this feedback voltage, and the second input of this error amplifier is coupled to this reference voltage; And
The pulse width modulation module, its input is coupled to the output of this error amplifier, the output of this pulse width modulation module is coupled to this switching crystal circuit so that this modulation signal to be provided, and wherein this pulse width modulation module is adjusted the pulse duration of this modulation signal accordingly according to the output of this error amplifier.
8. the voltage generator of great dynamic range according to claim 1, is characterized in that, this second control signal comprises the first switching signal and second switch signal, and this variable voltage source comprises:
The first switch, its first end receives the first direct voltage, and the second end of this first switch is coupled to the output of this variable voltage source, and the control end of this first switch receives this first switching signal; And
Second switch, its first end receives the second direct voltage, and the second end of this second switch is coupled to the output of this variable voltage source, and the control end of this second switch receives this second switch signal;
Wherein this first direct voltage is different from this second direct voltage.
9. the voltage generating method of a great dynamic range, is characterized in that, comprising:
Transformer is provided, and this transformer has first siding ring and second siding ring at least;
Provide and switch the crystal circuit, this switching crystal circuit is coupled to the first siding ring of this transformer;
Use source voltage to drive this first siding ring by this switching crystal circuit according to modulation signal;
Rectification circuit is provided, and the input of this rectification circuit is coupled to the second siding ring of this transformer;
Output by this rectification circuit provides the output of target voltage as this voltage generator;
Adjustable voltage division circuit is provided, and the input of this adjustable voltage division circuit is coupled to the output of this rectification circuit;
Output by this adjustable voltage division circuit provides feedback voltage, and wherein the partial pressure ratio of this adjustable voltage division circuit is controlled by the first control signal;
Feedback circuit is provided, and the input of this feedback circuit is coupled to the output of this adjustable voltage division circuit;
By this feedback circuit relatively this feedback voltage and reference voltage, and adjust this modulation signal according to comparative result, to provide this modulation signal to this switching crystal circuit;
Variable voltage source is provided, and the output of this variable voltage source is coupled to this switching crystal circuit; And
Adjust this source voltage by this variable voltage source according to the second control signal, to provide this source voltage to this switching crystal circuit.
10. the voltage generating method of great dynamic range according to claim 9, it is characterized in that, this switching crystal circuit is flyback power-switching circuit, push-pull type power-switching circuit, forward type power-switching circuit, semibridge system power-switching circuit or full-bridge type power-switching circuit.
11. the voltage generating method of great dynamic range according to claim 9 also comprises:
By the output of the second siding ring of this rectification circuit rectification and this transformer of multiplication of voltage, so that this target voltage to be provided.
12. the voltage generating method of great dynamic range according to claim 9 is characterized in that, described output by this adjustable voltage division circuit provides the step of feedback voltage to comprise:
Adjust the resistance of first time resistance of this adjustable voltage division circuit and the resistance of second time resistance according to this first control signal, to determine the partial pressure ratio of this adjustable voltage division circuit.
13. the voltage generator of a great dynamic range is characterized in that, comprising:
Transformer has first siding ring and second siding ring at least;
Switch the crystal circuit, be coupled to the first siding ring of this transformer, this switching crystal circuit uses source voltage to drive this first siding ring according to modulation signal;
Variable voltage source, its output are coupled to this switching crystal circuit so that this source voltage to be provided, and wherein this variable voltage source is adjusted this source voltage according to control signal;
Rectification circuit, its input is coupled to the second siding ring of this transformer, and the output of this rectification circuit provides the output of target voltage as this voltage generator; And
Feedback circuit, its input is coupled to the output of this rectification circuit, and the output of this feedback circuit provides this modulation signal to this switching crystal circuit, and wherein this feedback circuit is adjusted this modulation signal according to this target voltage.
14. the voltage generator of great dynamic range according to claim 13, it is characterized in that, this switching crystal circuit is flyback power-switching circuit, push-pull type power-switching circuit, forward type power-switching circuit, semibridge system power-switching circuit or full-bridge type power-switching circuit.
15. the voltage generator of great dynamic range according to claim 13 is characterized in that, this switching crystal circuit comprises:
Wire, its first end are coupled to the output of this variable voltage source to receive this source voltage, and the second end of this wire is coupled to the first end of the first siding ring of this transformer; And
Switching transistor, its first end are coupled to the second end of the first siding ring of this transformer, the second end ground connection of this switching transistor, and the control end of this switching transistor is coupled to this feedback circuit to receive this modulation signal.
16. the voltage generator of great dynamic range according to claim 13 is characterized in that, this rectification circuit comprises:
Diode, its anode is coupled to the first end of the second siding ring of this transformer, and the negative electrode of this diode is as the output of this rectification circuit; And
Electric capacity, its first end is coupled to the negative electrode of this diode, and the second end of this electric capacity is coupled to the second end of the second siding ring of this transformer.
17. the voltage generator of great dynamic range according to claim 13 is characterized in that, the output of the second siding ring of this rectification circuit rectification and this transformer of multiplication of voltage is to provide this target voltage.
18. the voltage generator of great dynamic range according to claim 13 is characterized in that, this feedback circuit comprises:
Bleeder circuit, its input is coupled to the output of this rectification circuit, and the output of this bleeder circuit provides feedback voltage;
Error amplifier, its first input end are coupled to the output of this bleeder circuit to receive this feedback voltage, and the second input of this error amplifier is coupled to this reference voltage; And
The pulse width modulation module, its input is coupled to the output of this error amplifier, the output of this pulse width modulation module is coupled to this switching crystal circuit so that this modulation signal to be provided, and wherein this pulse width modulation module is adjusted the pulse duration of this modulation signal accordingly according to the output of this error amplifier.
19. the voltage generator of great dynamic range according to claim 18 is characterized in that, this bleeder circuit comprises:
Upper resistance, its first end is coupled to the output of this rectification circuit, and on this, the second end of resistance is as the output of this bleeder circuit; And
Lower resistance, its first end are coupled to the second end of resistance on this, and the second end of this time resistance is coupled to the second end of the second siding ring of this transformer.
20. the voltage generator of great dynamic range according to claim 13 is characterized in that, this control signal comprises the first switching signal and second switch signal, and this variable voltage source comprises:
The first switch, its first end receives the first direct voltage, and the second end of this first switch is coupled to the output of this variable voltage source, and the control end of this first switch receives this first switching signal; And
Second switch, its first end receives the second direct voltage, and the second end of this second switch is coupled to the output of this variable voltage source, and the control end of this second switch receives this second switch signal;
Wherein this first direct voltage is different from this second direct voltage.
21. the voltage generating method of a great dynamic range is characterized in that, comprising:
Transformer is provided, and this transformer has first siding ring and second siding ring at least;
Provide and switch the crystal circuit, this switching crystal circuit is coupled to the first siding ring of this transformer;
Use source voltage to drive this first siding ring by this switching crystal circuit according to modulation signal;
Variable voltage source is provided, and the output of this variable voltage source is coupled to this switching crystal circuit;
Adjust this source voltage by this variable voltage source according to control signal, to provide this source voltage to this switching crystal circuit;
Rectification circuit is provided, and the input of this rectification circuit is coupled to the second siding ring of this transformer;
Output by this rectification circuit provides the output of target voltage as this voltage generator;
Feedback circuit is provided, and the input of this feedback circuit is coupled to the output of this rectification circuit; And
Output by this feedback circuit provides this modulation signal to this switching crystal circuit, and wherein this feedback circuit is adjusted this modulation signal according to this target voltage.
22. the voltage generating method of great dynamic range according to claim 21, it is characterized in that, this switching crystal circuit is flyback power-switching circuit, push-pull type power-switching circuit, forward type power-switching circuit, semibridge system power-switching circuit or full-bridge type power-switching circuit.
23. the voltage generating method of great dynamic range according to claim 21 is characterized in that, also comprises:
By the output of the second siding ring of this rectification circuit rectification and this transformer of multiplication of voltage, so that this target voltage to be provided.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100148308 | 2011-12-23 | ||
| TW100148308A TWI467908B (en) | 2011-12-23 | 2011-12-23 | Voltage generator and voltage generating method with wide dynamic range |
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| Publication Number | Publication Date |
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| CN103178716A true CN103178716A (en) | 2013-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100579706A Pending CN103178716A (en) | 2011-12-23 | 2012-03-07 | Voltage generator with large dynamic range and voltage generation method |
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| TW (1) | TWI467908B (en) |
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| CN104868573A (en) * | 2015-06-02 | 2015-08-26 | 集怡嘉数码科技（深圳）有限公司 | Power adapter and quick charging switching method |
| CN105118451A (en) * | 2015-08-19 | 2015-12-02 | 深圳市华星光电技术有限公司 | Driving circuit and liquid crystal display device |
| CN106487231A (en) * | 2015-08-31 | 2017-03-08 | 英飞凌科技奥地利有限公司 | Electric pressure converter and voltage conversion method |
| CN107454350A (en) * | 2017-08-25 | 2017-12-08 | 电子科技大学 | Pulse width modulation type image sensor circuit and its processing method |
| WO2021143197A1 (en) * | 2020-01-19 | 2021-07-22 | 苏州浪潮智能科技有限公司 | Apparatus and method for adjusting output voltage of power circuit |
| CN113702832A (en) * | 2021-10-29 | 2021-11-26 | 深圳市东鼎丰电子有限公司 | Micro motor test board card and micro motor tester |
| WO2022077273A1 (en) * | 2020-10-14 | 2022-04-21 | 深圳欣锐科技股份有限公司 | Direct current voltage output circuit, and method |
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| WO2022077273A1 (en) * | 2020-10-14 | 2022-04-21 | 深圳欣锐科技股份有限公司 | Direct current voltage output circuit, and method |
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Also Published As
| Publication number | Publication date |
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| TWI467908B (en) | 2015-01-01 |
| TW201328160A (en) | 2013-07-01 |
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Application publication date: 20130626 |