CN1114271C - V/F converter - Google Patents
V/F converter Download PDFInfo
- Publication number
- CN1114271C CN1114271C CN 96111184 CN96111184A CN1114271C CN 1114271 C CN1114271 C CN 1114271C CN 96111184 CN96111184 CN 96111184 CN 96111184 A CN96111184 A CN 96111184A CN 1114271 C CN1114271 C CN 1114271C
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- China
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- voltage
- transistor
- current
- analog input
- final stage
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- Control Of Electrical Variables (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Analogue/Digital Conversion (AREA)
- Amplifiers (AREA)
Abstract
To attain improvement so that the characteristics of analog input voltage and output frequency can be linear by supplying a constant voltage from a constant voltage source to the base of a transistor provided between a final stage switching element consisting of a current mirror circuit and a load. A transistor 6 is provided between the transistor of final stage consisting of a current mirror circuit 3 and an external load composed of a resistor 4 and a capacitor 5. The constant voltage is supplied from a constant voltage source 7 to the base of this transistor 6. Thus, the base voltage of the transistor 6 is fixed. The emitter-base voltage of the transistor 6 is fixed as well and the emitter voltage of the transistor 6 can be fixed. Therefore, the collector-emitter voltage of the transistor on the final stage at the current mirror circuit 3 can be fixed and an error can be prevented from being generated in a constant current I of the current mirror circuit 3 by the value of an analog input voltage Vin.
Description
Technical field
The present invention relates to the analog voltage amount of input is transformed to the voltage/frequency converter of the frequency values of output pulse.
Background technology
Fig. 4 is expression existing voltage/frequency converter (V/F converter) circuit diagram.In the figure, the 1st, the voltage/frequency converter; The 2nd, the comparator that analog input voltage Vin and fiducial value compare; The 3rd, current miller circuit that constant-current driving is used and its constant current I flow through the external loading of being made up of resistance 4 and electric capacity 5 and produce electromotive force V
0, and be the electromotive force V that produces
0Become identical value with analog input voltage Vin, control the control circuit of this constant current I by seasonal effect in time series.
Describe with regard to its operation principle below.
Voltage/frequency converter 1 be with the corresponding voltage of analog input voltage Vin, be transformed to frequency to voltage converter with output frequency Fout, promptly be a kind of A/D converter.
This general voltage/frequency converter 1, the current miller circuit that has constant-current driving to use, this constant current I flow through as the resistance 4 of external loading and produce electromotive force V
0, and for making this electromotive force V
0Become identical value with analog input voltage Vin, control this constant current, just analog input voltage Vin can be transformed to output frequency Fout by the time sequence.
Though analog input voltage Vin can be transformed to output frequency Fout with this general voltage/frequency converter 1, but, as pressing the connected mode of existing voltage/frequency converter 1 as shown in Figure 4, will become shown in Figure 5, the characteristic of analog input voltage Vin and output frequency Fout is not linear just.
Illustrate below this is available.
At first, existing voltage/frequency converter input and output relational expression roughly is expressed as follows:
Fout＝Vin/(I×R1×α)
At this, α: be the constant of common voltage/frequency changer.
In following formula, output frequency Fout and analog input voltage Vin are proportional relations, and as the constant current I of the current miller circuit of constant, owing to the difference along with analog input voltage Vin value produces error, so corresponding output frequency Fout becomes non-linear relation with the variation of analog input voltage Vin.
Existing voltage/frequency converter, because constitute as described above, the constant current I that makes current miller circuit produces error with the difference of analog input voltage Vin value, as shown in Figure 5, exist the output frequency Fout corresponding to become problems such as non-linear relation with the variation of analog input voltage Vin.
Summary of the invention
In order to solve the problem of above-mentioned existence, the objective of the invention is, around general voltage/frequency converter, only connect cheap element, make the characteristic of analog input voltage and output frequency become linear relationship, performance-oriented voltage/frequency converter is provided.
Voltage/frequency converter of the present invention is provided with transistor between final stage switching device that constitutes current miller circuit and load, supply with burning voltage from stabilized voltage power supply to this transistor base, makes the characteristic between analog input voltage and output frequency become linearity.
Description of drawings
Fig. 1 is the circuit diagram of expression according to the voltage/frequency converter of embodiment of the present invention.
Fig. 2 is the transistorized static characteristic curve figure of expression.
Fig. 3 is the performance diagram that expression improves according to the voltage/frequency transducer performance of embodiment of the present invention.
Fig. 4 is the circuit diagram of the existing voltage/frequency converter of expression.
Fig. 5 is the performance plot of the existing voltage/frequency converter of expression.
Embodiment
Describe with regard to a kind of embodiment of the present invention below.
Embodiment 1
In Fig. 1,1 is the voltage/frequency converter; 2 is the comparator that analog input voltage Vin and fiducial value compare; 3 current miller circuit and this constant current I that use for constant-current driving flow through the external loading that is made of resistance (load) and electric capacity (load) 5, and the electromotive force V that produces
0, and make the electromotive force V of generation
0Become identical value with analog input voltage Vin, control the control circuit of this constant current I by the time sequence.The 6th, the transistor that between final stage switch element (the switching element of the final stage) that constitutes current miller circuit 3 and external loading, is provided with, the 7th, supply with the stabilized voltage power supply of burning voltage to the base stage of this transistor (Transister) 6.
Describe with regard to its operation principle below.
At first, existing voltage/frequency converter (voltage/frequency converter), the constant current I of current miller circuit (current miller circuit) 3 is owing to the value along with analog input voltage Vin produces error, so the generation reason of this error is discussed.
From the final stage transistor of current miller circuit 3, flow to the transistorized collector current I of final stage
cBe equivalent to above-mentioned constant current I, therefore, consider collector emitter voltage V according to the static characteristic of transistor basic theories
CeWith collector current I
cRelation, as shown in Figure 2.As can be seen from Figure 2, even base current I
bNecessarily, with collector emitter voltage (collecter-emitter voltage)
v
CeChange and collector current I
cJust and then change.Therefore, when wishing collector current I
cKeep one regularly, collector emitter voltage V
CeMust keep certain.
This principle is applied in this embodiment, if make the transistorized collector emitter voltage V of current miller circuit 3 final stages
CeKeep certain, its transistorized collector current I
cJust not change, therefore, constant current I just can not produce error owing to the variation of analog input voltage Vin value, and this is clearly.
In Fig. 1, the transistorized collector voltage of the final stage of current miller circuit 3, owing to be exactly certain, if emitter voltage V. in the past
eAlso be certain, obviously, collector emitter voltage V
CeJust can become certain.
Therefore, the voltage/frequency converter of this form of implementation between final stage transistor that constitutes current miller circuit and the external loading be made up of resistance 4 and electric capacity 5, is provided with transistor 6, and from the base stage supply burning voltage of stabilized voltage power supply 7, according to the base voltage V of transistor 6 to transistor 6
bNecessarily constitute the voltage/frequency converter like that, because the emitter base voltage V of transistor 6
EbCan set certain value for, so, the emitter voltage of transistor 6, i.e. final stage emitter voltage V
eAlso just can be certain.
Therefore, as mentioned above, with the transistorized collector emitter voltage V of the final stage of current miller circuit 3
CeBe arranged to necessarily, the constant current I that just can prevent current miller circuit 3 produces error with the variation of analog input voltage Vin value.As shown in Figure 3, the relation of analog input voltage Vin and output frequency Fout, can improve becomes linear relationship.
As above according to the present invention, between final stage switch element that constitutes current miller circuit and load, transistor is set, and supply with burning voltage to this transistorized base stage from stabilized voltage power supply, constitute like this, just can make the transistorized collector emitter voltage of current miller circuit final stage constant, the constant current of the current miller circuit that prior art exists produces the problem of error with the value of analog input voltage, just can prevent.Around general voltage/frequency converter, only need to connect cheap component, the characteristic of analog input voltage and output frequency, just can improve becomes linear effect.
Claims (1)
1. voltage/frequency converter is characterized in that comprising: the comparator that is used to import input voltage and this input voltage and fiducial value are compared; The current miller circuit that connects above-mentioned comparator output terminal; Be connected the distolateral load of fiducial value input of above-mentioned comparator input reference; The transistor that between final stage switch element that constitutes above-mentioned current miller circuit and above-mentioned load, is provided with; And connect above-mentioned transistorized base stage and supply with the stabilized voltage power supply of burning voltage.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP229223/95 | 1995-09-06 | ||
| JP7229223A JPH0974342A (en) | 1995-09-06 | 1995-09-06 | V/f converter |
| JP229223/1995 | 1995-09-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1153429A CN1153429A (en) | 1997-07-02 |
| CN1114271C true CN1114271C (en) | 2003-07-09 |
Family
ID=16888766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96111184 Expired - Fee Related CN1114271C (en) | 1995-09-06 | 1996-09-05 | V/F converter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0974342A (en) |
| CN (1) | CN1114271C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5854564A (en) * | 1997-05-12 | 1998-12-29 | Microchip Technology Incorporated | Direct sensor interface (DSI) module |
-
1995
- 1995-09-06 JP JP7229223A patent/JPH0974342A/en active Pending
-
1996
- 1996-09-05 CN CN 96111184 patent/CN1114271C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1153429A (en) | 1997-07-02 |
| JPH0974342A (en) | 1997-03-18 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |