CN203422691U - Reference voltage source circuit - Google Patents
Reference voltage source circuit Download PDFInfo
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- CN203422691U CN203422691U CN201320509176.0U CN201320509176U CN203422691U CN 203422691 U CN203422691 U CN 203422691U CN 201320509176 U CN201320509176 U CN 201320509176U CN 203422691 U CN203422691 U CN 203422691U
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- Prior art keywords
- voltage
- resistance
- output terminal
- application circuit
- reference voltage
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Abstract
The utility model discloses a reference voltage source circuit. A voltage division circuit is formed between a first reference voltage signal and a second reference voltage signal through a first resistor and a second resistor, so that pressure drop is formed on the second resistor, a reference voltage signal output by the output end of the reference voltage source circuit is a difference value between the second reference voltage signal and the pressure drop, then the value of resistance of the first resistor and the value of resistance of the second resistor are regulated, and therefore any reference voltage signal smaller than a voltage value at the first reference voltage end and a voltage value at the second reference voltage end can be achieved.
Description
Technical field
The utility model relates to reference voltage source technical field, relates in particular to a kind of reference voltage source circuit.
Background technology
In electronic system, reference voltage is very important to the setting of static system working point.Due to the high request to reference voltage precision, many Complex Electronic Systems Baseds adopt operational amplifier or integrated voltage reference chip to set required reference voltage.Conventional voltage reference chip is three ends voltage stabilizing diode 431 able to programme, its output voltage can be by changing resistance free setting in wider scope of peripheral resistance, circuit design is simple, and device is cheap, increasing electronic system extensively adopts integrated device as reference voltage output source.
But the integrated voltage reference chip of available technology adopting is as reference voltage output source, and its intrinsic defect is: the reference voltage of output is minimum is reference voltage; Reference voltage as 431 is 2.5V, like product as 432, the minimum reference voltage of 431L also can only arrive 1.24V, just limited thus the design freedom of part reference voltage source application.
Utility model content
In view of this, the utility model provides a kind of reference voltage source circuit, to solve the problem that lower reference voltage can not be provided in prior art.
To achieve these goals, the existing scheme proposing is as follows:
, comprising:
Be connected between the first power supply and ground, the first output terminal is exported the first reference voltage signal, and the second output terminal is exported the first voltage reference chip application circuit of the first reference voltage signal;
Be connected between second source and ground, output terminal is exported the second voltage fiducial chip application circuit of the second reference voltage signal;
Be connected in the second output terminal of described the first voltage reference chip application circuit and the first resistance between described second voltage fiducial chip application circuit output terminal;
The second resistance that one end is connected with described second voltage fiducial chip application circuit output terminal; The other end of described the second resistance is the output terminal of described reference voltage source circuit.
Preferably, described the first voltage reference chip application circuit comprises:
The 3rd resistance that one end is connected with described the first power supply;
The first voltage reference chip that negative electrode port is connected with described the 3rd resistance other end; The negative electrode port of described the first voltage reference chip is the second output terminal of described the first voltage reference chip application circuit, the anode port ground connection of described the first voltage reference chip; The reference edge of described the first voltage reference chip is the first output terminal of described the first voltage reference chip application circuit;
Be connected in the first output terminal of described the first voltage reference chip application circuit and the 4th resistance between the second output terminal;
Be connected in the first output terminal of described the first voltage reference chip application circuit and the 5th resistance between ground;
The first electric capacity that internal polar plate is connected with the second output terminal of described the first voltage reference chip application circuit; The external polar plate ground connection of described the first electric capacity.
Preferably, described second voltage fiducial chip application circuit comprises:
The 6th resistance that one end is connected with described second source;
The 7th resistance that one end is connected with the other end of described the 6th resistance;
The second voltage fiducial chip that negative electrode port is connected with the tie point of described the 6th resistance and the 7th resistance; The anode port ground connection of described second voltage fiducial chip; The reference edge of described second voltage fiducial chip is the output terminal of described second voltage fiducial chip application circuit;
The second electric capacity that one end is connected with the other end of described the 7th resistance; The other end of described the second electric capacity is connected with the output terminal of described second voltage fiducial chip application circuit.
Preferably, described the first voltage reference chip is three ends voltage stabilizing diode 431 able to programme, 431L or 432.
Preferably, described second voltage fiducial chip is three ends voltage stabilizing diode 431 able to programme, 431L or 432.
From above-mentioned technical scheme, can find out, the disclosed reference voltage source circuit of the utility model, by described the first resistance and the second resistance, between described the first reference voltage signal and the second reference voltage signal, form a bleeder circuit, thereby form pressure drop on described the second resistance, making the reference voltage signal of described reference voltage source circuit output terminal output is the difference of described the second reference voltage signal and described pressure drop, again by the adjusting to described the first resistance and the second resistance, can realize any reference voltage signal lower than described the first reference voltage end and the second reference voltage end magnitude of voltage.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the disclosed reference voltage source circuit figure of the utility model embodiment;
Fig. 2 is the disclosed reference voltage source circuit figure of another embodiment of the utility model;
Fig. 3 is the disclosed reference voltage source circuit figure of another embodiment of the utility model;
Fig. 4 is the disclosed reference voltage source circuit figure of another embodiment of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides a kind of reference voltage source circuit, to solve the problem that lower reference voltage can not be provided in prior art.
Concrete, as shown in Figure 1, comprising:
Be connected in the first power supply V
in1and between ground, the first output terminal is exported the first reference voltage signal V
ref1, the second output terminal is exported the first reference voltage signal V
o1the first voltage reference chip application circuit 101;
Be connected in second source V
in2and between ground, output terminal is exported the second reference voltage signal V
ref2, and the second voltage fiducial chip application circuit 102 of no current fan-out capability;
Be connected in the second output terminal of the first voltage reference chip application circuit 101 and the first resistance R 1 between second voltage fiducial chip application circuit 102 output terminals;
The second resistance R 2 that one end is connected with second voltage fiducial chip application circuit 102 output terminals; The other end of the second resistance R 2 is the output terminal of described reference voltage source circuit.
Concrete principle of work is:
The voltage signal at the first resistance R 1 two ends is respectively the first reference voltage signal V
o1with the second reference voltage signal V
ref2, the second resistance R 2 receives the second reference voltage signal V
ref2, export the reference voltage signal V of described reference voltage source circuit
o; The output terminal of second voltage fiducial chip application circuit 102 is exported the second reference voltage signal V
ref2, no current fan-out capability, flows through the first resistance R 1 identical with the electric current of the second resistance R 2, and the pressure drop dropping in the second resistance R 2 is Δ V=(V
o1-V
ref2) ÷ R1 * R2=V
ref2-V
o; So reference voltage signal V of described reference voltage source circuit
o=V
ref2-Δ V=V
ref2-(V
o1-V
ref2) ÷ R1 * R2.The first reference voltage signal V of the first voltage reference chip application circuit 101 outputs
o1be the first reference voltage signal V
ref1by internal calculation, obtain, so the reference voltage signal V of described reference voltage source circuit
obe the first reference voltage signal V
ref1, the second reference voltage signal V
ref2, the first resistance R 1 and the second resistance R 2 function, by the adjusting to the first resistance R 1 and the second resistance R 2 resistances, can realize arbitrarily lower than the first reference voltage signal V
ref1with the second reference voltage signal V
ref2reference voltage signal V
o.
The disclosed reference voltage source circuit of the present embodiment, by the first resistance R 1 and the second resistance R 2 at the first reference voltage signal V
o1with the second reference voltage signal V
ref2between form a bleeder circuit, thereby in the second resistance R 2, form pressure drop Δ V, make the reference voltage signal V of described reference voltage source circuit output terminal output
obe the second reference voltage signal V
ref2with the difference of pressure drop Δ V, then by the adjusting to the first resistance R 1 and the second resistance R 2 resistances, can realize arbitrarily lower than the first reference voltage signal V
ref1with the second reference voltage signal V
ref2reference voltage signal V
o.
The present embodiment also provides another reference voltage source circuit, as shown in Figure 2, comprising: the first voltage reference chip application circuit 101, second voltage fiducial chip application circuit 102, the first resistance R 1 and the second resistance R 2;
Wherein, the first voltage reference chip application circuit 101 comprises:
One end and the first power supply V
in1the 3rd resistance R 3 being connected;
The first voltage reference chip U1 that negative electrode port is connected with the 3rd resistance R 3 other ends; The negative electrode port of the first voltage reference chip U1 is the second output terminal of the first voltage reference chip application circuit 101, the anode port ground connection of the first voltage reference chip U1; The reference edge of the first voltage reference chip U1 is the first output terminal of the first voltage reference chip application circuit 101;
Be connected in the first output terminal of the first voltage reference chip application circuit 101 and the 4th resistance R 4 between the second output terminal;
Be connected in the first output terminal of the first voltage reference chip application circuit 101 and the 5th resistance R 5 between ground;
The first capacitor C 1 that internal polar plate is connected with the second output terminal of the first voltage reference chip application circuit 101; The external polar plate ground connection of the first capacitor C 1.
Concrete principle of work is:
The 4th resistance R 4 and the 5th resistance R 5 are series at the first reference voltage signal V
o1and between ground, the electric current that flows through the 4th resistance R 4 is identical with the electric current that flows through the 5th resistance R 5; The 5th resistance R 5 is connected in the first reference voltage signal V
ref1and between ground, the first reference voltage signal V
o1=V
ref1÷ R5 * (R4+R5), so the reference voltage signal V of described reference voltage source circuit
o=V
ref2-Δ V=V
ref2-(V
o1-V
ref2) ÷ R1 * R2=V
ref2-[V
ref1÷ R5 * (R4+R5)-V
ref2] ÷ R1 * R2.
In the present embodiment, connected mode and the principle of work of other components and parts are same as the previously described embodiments, repeat no more herein.
The present embodiment also provides another reference voltage source circuit, as shown in Figure 3, comprising: the first voltage reference chip application circuit 101, second voltage fiducial chip application circuit 102, the first resistance R 1 and the second resistance R 2;
Wherein, second voltage fiducial chip application circuit 102 comprises:
One end and second source V
in2the 6th resistance R 6 being connected;
The 7th resistance R 7 that one end is connected with the other end of the 6th resistance;
The second voltage fiducial chip U2 that negative electrode port is connected with the tie point of the 6th resistance R 6 and the 7th resistance R 7; The anode port ground connection of second voltage fiducial chip U2; The reference edge of second voltage fiducial chip U2 is the output terminal of second voltage fiducial chip application circuit 102;
The second capacitor C 2 that one end is connected with the other end of the 7th resistance R 7; The other end of the second capacitor C 2 is connected with the output terminal of second voltage fiducial chip application circuit 102.
The output terminal of second voltage fiducial chip application circuit 102 be second voltage fiducial chip U2 reference edge, export the second reference voltage signal V
ref2, but no current fan-out capability, is beneficial to the dividing potential drop output of the first resistance R 1 and the second resistance R 2.
In the present embodiment, connected mode and the principle of work of other components and parts are same as the previously described embodiments, repeat no more herein.
The present embodiment also provides another reference voltage source circuit, as shown in Figure 4, comprising: the first voltage reference chip application circuit 101, second voltage fiducial chip application circuit 102, the first resistance R 1 and the second resistance R 2;
Wherein, the first voltage reference chip application circuit 101 comprises:
One end and the first power supply V
in1the 3rd resistance R 3 being connected;
The first voltage reference chip U1 that negative electrode port is connected with the 3rd resistance R 3 other ends; The negative electrode port of the first voltage reference chip U1 is the second output terminal of the first voltage reference chip application circuit 101, the anode port ground connection of the first voltage reference chip U1; The reference edge of the first voltage reference chip U1 is the first output terminal of the first voltage reference chip application circuit 101;
Be connected in the first output terminal of the first voltage reference chip application circuit 101 and the 4th resistance R 4 between the second output terminal;
Be connected in the first output terminal of the first voltage reference chip application circuit 101 and the 5th resistance R 5 between ground;
The first capacitor C 1 that internal polar plate is connected with the second output terminal of the first voltage reference chip application circuit 101; The external polar plate ground connection of the first capacitor C 1.
Second voltage fiducial chip application circuit 102 comprises:
One end and second source V
in2the 6th resistance R 6 being connected;
The 7th resistance R 7 that one end is connected with the other end of the 6th resistance;
The second voltage fiducial chip U2 that negative electrode port is connected with the tie point of the 6th resistance R 6 and the 7th resistance R 7; The anode port ground connection of second voltage fiducial chip U2; The reference edge of second voltage fiducial chip U2 is the output terminal of second voltage fiducial chip application circuit 102;
The second capacitor C 2 that one end is connected with the other end of the 7th resistance R 7; The other end of the second capacitor C 2 is connected with the output terminal of second voltage fiducial chip application circuit 102.
Wherein, the first voltage reference chip U1 can be identical with the model of second voltage fiducial chip U2, also can be different, and concrete model is selected and can be determined according to concrete actual application environment.
Preferably, the first voltage reference chip U1 is three ends voltage stabilizing diode 431 able to programme, 431L or 432.
Preferably, second voltage fiducial chip U2 is three ends voltage stabilizing diode 431 able to programme, 431L or 432.
The disclosed reference voltage source circuit of the present embodiment, the the first voltage reference chip application circuit 101 and second voltage fiducial chip application circuit 102 adopting, its inner formation is except conventional voltage reference chip, be only simple resistance capacitance components and parts, do not adopt diode or the higher operational amplifier of cost that temperature influence is larger, circuit is realized simple, and cost is low.
In the present embodiment, connected mode and the principle of work of other components and parts are same as the previously described embodiments, repeat no more herein.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the disclosed scheme of the application.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a reference voltage source circuit, is characterized in that, comprising:
Be connected between the first power supply and ground, the first output terminal is exported the first reference voltage signal, and the second output terminal is exported the first voltage reference chip application circuit of the first reference voltage signal;
Be connected between second source and ground, output terminal is exported the second voltage fiducial chip application circuit of the second reference voltage signal;
Be connected in the second output terminal of described the first voltage reference chip application circuit and the first resistance between described second voltage fiducial chip application circuit output terminal;
The second resistance that one end is connected with described second voltage fiducial chip application circuit output terminal; The other end of described the second resistance is the output terminal of described reference voltage source circuit.
2. reference voltage source circuit according to claim 1, is characterized in that, described the first voltage reference chip application circuit comprises:
The 3rd resistance that one end is connected with described the first power supply;
The first voltage reference chip that negative electrode port is connected with described the 3rd resistance other end; The negative electrode port of described the first voltage reference chip is the second output terminal of described the first voltage reference chip application circuit, the anode port ground connection of described the first voltage reference chip; The reference edge of described the first voltage reference chip is the first output terminal of described the first voltage reference chip application circuit;
Be connected in the first output terminal of described the first voltage reference chip application circuit and the 4th resistance between the second output terminal;
Be connected in the first output terminal of described the first voltage reference chip application circuit and the 5th resistance between ground;
The first electric capacity that internal polar plate is connected with the second output terminal of described the first voltage reference chip application circuit; The external polar plate ground connection of described the first electric capacity.
3. reference voltage source circuit according to claim 1, is characterized in that, described second voltage fiducial chip application circuit comprises:
The 6th resistance that one end is connected with described second source;
The 7th resistance that one end is connected with the other end of described the 6th resistance;
The second voltage fiducial chip that negative electrode port is connected with the tie point of described the 6th resistance and the 7th resistance; The anode port ground connection of described second voltage fiducial chip; The reference edge of described second voltage fiducial chip is the output terminal of described second voltage fiducial chip application circuit;
The second electric capacity that one end is connected with the other end of described the 7th resistance; The other end of described the second electric capacity is connected with the output terminal of described second voltage fiducial chip application circuit.
4. reference voltage source circuit according to claim 1, is characterized in that, described the first voltage reference chip is three ends voltage stabilizing diode 431 able to programme, 431L or 432.
5. reference voltage source circuit according to claim 1, is characterized in that, described second voltage fiducial chip is three ends voltage stabilizing diode 431 able to programme, 431L or 432.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320509176.0U CN203422691U (en) | 2013-08-20 | 2013-08-20 | Reference voltage source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320509176.0U CN203422691U (en) | 2013-08-20 | 2013-08-20 | Reference voltage source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203422691U true CN203422691U (en) | 2014-02-05 |
Family
ID=50021785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320509176.0U Expired - Lifetime CN203422691U (en) | 2013-08-20 | 2013-08-20 | Reference voltage source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203422691U (en) |
-
2013
- 2013-08-20 CN CN201320509176.0U patent/CN203422691U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518000 1st floor to 5th floor, building 1, No. 4023, Wuhe Avenue, Gangtou community, Bantian street, Longgang District, Shenzhen City, Guangdong Province Patentee after: Shenzhen kangguan Technology Co.,Ltd. Address before: 518129, Longgang District, Guangdong City, Buji province Shenzhen Village No. five and 1 North Avenue, workshop 1, A District, 2 B District Patentee before: SHENZHEN KTC TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140205 |