CN202750010U - Linear voltage-decreasing circuit - Google Patents
Linear voltage-decreasing circuit Download PDFInfo
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- CN202750010U CN202750010U CN 201220340519 CN201220340519U CN202750010U CN 202750010 U CN202750010 U CN 202750010U CN 201220340519 CN201220340519 CN 201220340519 CN 201220340519 U CN201220340519 U CN 201220340519U CN 202750010 U CN202750010 U CN 202750010U
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- divider resistance
- resistance
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Abstract
The utility model discloses a linear voltage-decreasing circuit, which comprises a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a first voltage-stabilizing tube Z1 and a voltage-decreasing tube Q1, wherein after the first voltage-dividing resistor R1, the second voltage-dividing resistor R2 and the first voltage-stabilizing tube Z1 are connected in series in turn, the first voltage-dividing resistor R1 is connected with the anode of input voltage Vin; the anode of the first voltage-stabilizing tube Z1 is connected with the cathode of the input voltage Vin; the gate of the voltage-decreasing tube Q1 is connected between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2; the collector of the voltage-decreasing tube Q1 is connected to the anode of the input voltage Vin; and voltage between the emitter of the voltage-decreasing tube Q1 and the first voltage-stabilizing tube Z1 forms output voltage Vout. Output voltage and input voltage of the linear voltage-decreasing circuit disclosed by the utility model have linear relationship; when the input voltage exists, the output end has output voltage; the input voltage condition can be judged through the voltage relationship between output and input; therefore, the safety of equipment is increased.
Description
Technical field
The utility model relates to a kind of reduction voltage circuit, relates more specifically to a kind of linear voltage decreasing circuit.
Background technology
According to the conversion method of D.C. regulated power supply, it often is divided into Switching Power Supply and linear power supply, and both can both provide according to certain specification requirement galvanic current to press.The advantage such as switching power circuit is high with its conversion efficiency, loss is little, can step-down also can boost and be widely used in various electronic equipments.
But switching power circuit also has its unsurmountable shortcoming, be that switching power circuit exists starting resistor, when input voltage does not reach the set point of starting resistor, its no-output voltage, can't judge from output the situation of input voltage this moment, and can there be very large potential safety hazard in this circuit application in equipment.For addressing the above problem, can increase voltage detecting circuit at the input of Switching Power Supply, yet when input terminal voltage was higher, testing circuit meeting more complicated can increase cost so greatly.
Therefore, be necessary to provide a kind of reduction voltage circuit of device security that improves to address the aforementioned drawbacks.
The utility model content
The purpose of this utility model provides a kind of linear voltage decreasing circuit that can learn input voltage according to output voltage to improve the fail safe of equipment.
To achieve these goals, the technical solution adopted in the utility model is: a kind of linear voltage decreasing circuit is provided, it comprises the first divider resistance R1, the second divider resistance R2, the first voltage-stabiliser tube Z1 and decompression tube Q1, described the first divider resistance R1, the first divider resistance R1 linked to each other with the positive pole of input voltage vin and the positive pole of the first voltage-stabiliser tube Z1 links to each other with the negative pole of input voltage vin after the second divider resistance R2 and the first voltage-stabiliser tube Z1 connected successively, the gate pole of described decompression tube Q1 is connected between described the first divider resistance R1 and the second divider resistance R2, its collector electrode is connected to the positive pole of input voltage vin, and the voltage between the anode of its emitter and the first voltage-stabiliser tube Z1 forms output voltage V out.
Its further technical scheme is: described the first divider resistance R1 and/or the second divider resistance R2 are variable resistor.
Its further technical scheme is: described linear voltage decreasing circuit also comprises the first diode D1, and described the first diode D1 is connected in reverse parallel between the collector and emitter of described decompression tube Q1.
Its further technical scheme is: described linear voltage decreasing circuit also comprises the first current-limiting resistance R3, and described the first current-limiting resistance R3 one end is connected between the first divider resistance R1 and the second divider resistance R2, and the other end is connected to the gate pole of decompression tube Q1.
Its further technical scheme is: described linear voltage decreasing circuit also comprises the second voltage-stabiliser tube Z2, and the anode of described the second voltage-stabiliser tube Z2 links to each other with the emitter of decompression tube Q1, and the negative electrode of described the second voltage-stabiliser tube Z2 links to each other with the gate pole of decompression tube Q1.
Its further technical scheme is: described linear voltage decreasing circuit also comprises switching tube Q2 and detects resistance R 4, the base stage of described switching tube Q2 is connected to the emitter of decompression tube Q1, the collector electrode of described switching tube Q2 is connected between the first divider resistance R1 and the second divider resistance R2, described detection resistance R 4 is connected between the base stage and emitter of described switching tube Q2, and the voltage between the anode of the emitter of described switching tube Q2 and voltage-stabiliser tube Z1 forms output voltage V out.
Its further technical scheme is: described linear voltage decreasing circuit also comprises the 3rd divider resistance R5, and described the 3rd divider resistance R5 one end is connected between the first divider resistance R1 and the second divider resistance R2, and the other end is connected to the emitter of described decompression tube Q1.
Its further technical scheme is: described linear voltage decreasing circuit also comprises the second diode D2, and the anode of described the second diode D2 links to each other with the positive pole of input voltage vin, and the negative electrode of described the second diode D2 links to each other with the collector electrode of decompression tube Q1.
In another embodiment of the present utility model, described linear voltage decreasing circuit also comprises the second current-limiting resistance R6, and described the second current-limiting resistance R6 one end is connected to the anode of the second diode D2, and the other end is connected to the positive pole of input voltage vin.
Its further technical scheme is: described linear voltage decreasing circuit also comprises capacitor C, and described capacitor C is connected in parallel on the two ends of described the 3rd divider resistance R5.
Compared with prior art, output voltage and the input voltage of the utility model linear voltage decreasing circuit are linear, and when input voltage existed, output namely had output voltage, and can draw the input voltage situation by the voltage relationship judgement between output and the input, increased the fail safe of equipment.The utility model linear voltage decreasing circuit can be used as a complete circuit, namely as the linear voltage decreasing power supply, for other equipment provide input voltage; And can be used as the part of circuit, for example this circuit can be used between frequency converter busbar voltage and the drive plate reducing busbar voltage and provide input voltage as drive plate.The utility model linear voltage decreasing circuit all can be judged the input voltage situation by the situation of output voltage in above-mentioned two kinds of application, increased the fail safe of equipment.
By following description also by reference to the accompanying drawings, it is more clear that the utility model will become, and these accompanying drawings are used for explaining embodiment of the present utility model.
Description of drawings
Fig. 1 is the circuit diagram of the utility model linear voltage decreasing circuit the first embodiment.
Fig. 2 is the circuit diagram of the utility model linear voltage decreasing circuit the second embodiment.
Fig. 3 is the circuit diagram of the utility model linear voltage decreasing circuit the 3rd embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the embodiment is clearly and completely described, similar assembly label represents similar assembly in the accompanying drawing.Obviously, below only be the utility model part embodiment with the embodiment that describes, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is the circuit diagram of the utility model linear voltage decreasing circuit the first embodiment.
With reference to Fig. 1, the linear voltage decreasing circuit of the present embodiment comprises the first divider resistance R1, the second divider resistance R2, the first voltage-stabiliser tube Z1 and decompression tube Q1.Its physical circuit is as follows: the two ends that are connected in parallel on together input voltage vin after the successively series connection of the first divider resistance R1, the second divider resistance R2 and the first voltage-stabiliser tube Z1, wherein, the first divider resistance R1 links to each other with the positive pole of input voltage vin, the positive pole of the first voltage-stabiliser tube Z1 links to each other with the negative pole of input voltage vin, the gate pole of decompression tube Q1 is connected between the first divider resistance R1 and the second divider resistance R2, its collector electrode is connected to the positive pole of input voltage vin, and the voltage between the anode of its emitter and the first voltage-stabiliser tube Z1 forms output voltage V out.
In the present embodiment, decompression tube Q1 selects IGBT to realize.In order to protect decompression tube Q1, reverse parallel connection has the first diode D1(fly-wheel diode between the collector and emitter of decompression tube Q1) with quick absorption instantaneous energy, avoid decompression tube Q1 to be punctured by instantaneous high pressure.
In above-mentioned linear voltage decreasing circuit, decompression tube Q1 is operated in linear condition, gate pole and the pressure drop Vge between the emitter that voltage-stabiliser tube Z1 is used for compensation decompression tube Q1 export to realize linearity, the selection of the voltage stabilizing value Vz of voltage-stabiliser tube Z1 is relevant with the voltage Vge between the emitter with the gate pole of the first divider resistance R1, the second divider resistance R2 and decompression tube Q1, and its concrete principle is as follows:
Take the gate pole electromotive force of decompression tube Q1 as reference point, can list following equation:
Abbreviation gets:
In order to make output voltage V out and input voltage vin linear, then need satisfy:
Can obtain the voltage stabilizing value of voltage-stabiliser tube Z1:
This moment output voltage:
Based on the foregoing circuit principle as can be known, then can be so that the output voltage V out of linear voltage decreasing circuit and input voltage vin satisfy the linear relationship that formula 1.5 limits as long as according to above-mentioned formula 1.4 the voltage stabilizing value Vz of voltage-stabiliser tube Z1 is set.In the present embodiment, the first divider resistance R1 and the second divider resistance R2 can be set to variable resistor, like this, can change by changing its resistance the step-down coefficient of this linear voltage decreasing circuit.
Fig. 2 is the circuit diagram of the utility model linear voltage decreasing circuit the second embodiment.
With reference to Fig. 2, the linear voltage decreasing circuit of the present embodiment comprises the first divider resistance R1, the second divider resistance R2, the first voltage-stabiliser tube Z1, decompression tube Q1, the first diode D1, detects resistance R 4, the 3rd divider resistance R5 and switching tube Q2, wherein, decompression tube Q1 selects IGBT, the second open pipe Q2 selects triode, and the 3rd divider resistance R5 selects large resistance resistive element with Isolation input and output voltage.Its physical circuit is as follows: circuit connecting relation and the first embodiment between the first divider resistance R1, the second divider resistance R2, the first voltage-stabiliser tube Z1 and the decompression tube Q1 are similar, the base stage of switching tube Q2 is connected to the emitter of decompression tube Q1, resistance R 4 links to each other with its base stage and pass through the 3rd divider resistance R5 links to each other with its collector electrode its emitter by detecting, its collector electrode is connected between the first divider resistance R1 and the second divider resistance R2, and the voltage between the anode of the emitter of switching tube Q2 and voltage-stabiliser tube Z1 namely forms output voltage V out.In the above-mentioned linear voltage decreasing circuit, the selection of the voltage stabilizing value Vz of voltage-stabiliser tube Z1 and operation principle and first embodiment of circuit are similar, do not repeat them here.
The present embodiment is compared the current foldback circuit that the first embodiment has increased by the 3rd divider resistance R5 and has been comprised of switching tube Q2 and detection resistance R 4; the operation principle of this partial circuit is as follows: when the electric current of circuit is excessive; the voltage that detects resistance R 4 two ends can increase; and reach cut-in voltage between switching tube Q2 base stage and the emitter; switching tube Q2 conducting, and decompression tube Q1 is quit work.After the switching tube Q2 conducting, flow through and detect the current reduction of resistance R 4, and make the base stage of switching tube Q2 and the voltage between the emitter be lower than cut-in voltage, this moment, switching tube Q2 turn-offed.The on-off action of above-mentioned switching tube Q2 is very fast, after this comes dividing potential drop with the reduction output current by the 3rd divider resistance R5, thereby has realized the effect of overcurrent protection.When output current returned to normal value, decompression tube Q1 resumed work, so repeatedly.
In addition, in order further to improve circuit performance, the present embodiment linear voltage decreasing circuit has also been done following improvement: be reflected back input in order to prevent the peak voltage that IGBT produces, between the positive pole of the collector electrode of decompression tube Q1 and input voltage vin, increased by the second diode D2, the anode of described the second diode D2 links to each other with the positive pole of input voltage vin, and the negative electrode of described the second diode D2 links to each other with the collector electrode of decompression tube Q1; In order further to protect decompression tube Q1, also comprise the first current-limiting resistance R3 in the circuit, this first current-limiting resistance R3 one end is connected to the connected node of the first divider resistance R1 and the second divider resistance R2, and its other end is connected to the gate pole of decompression tube Q1; For the emitter of controlled hypotension pipe Q1 and the voltage between the gate pole, the present embodiment also comprises the second voltage-stabiliser tube Z2, the positive and negative electrode of this second voltage-stabiliser tube Z2 is connected respectively to emitter and the gate pole of decompression tube Q1, and the second voltage-stabiliser tube Z2 can be its voltage stabilizing value with the gate pole of decompression tube Q1 and the limiting voltage of emitter.
Fig. 3 is the circuit diagram of the utility model linear voltage decreasing circuit the 3rd embodiment.
With reference to Fig. 3; linear voltage decreasing circuit and second embodiment of the present embodiment are similar; its difference only is: in the present embodiment; removal is by switching tube Q2 and detect the current foldback circuit that resistance R 4 consists of and increase by one second current-limiting resistance R6 in circuit; described the second current-limiting resistance R6 one end is connected to the anode of the second diode D2, and the other end is connected to the positive pole of input voltage vin.The setting of this second current-limiting resistance R6 can limit, reduce the collector current of decompression tube Q1; thereby strengthen the effect of the described generation of the second diode D2 " preventing that the peak voltage that IGBT produces is reflected back input ", finally realize IGBT(decompression tube Q1) play the effect of overcurrent protection.In addition, in the present embodiment, in order to protect the gate pole of decompression tube Q1, the two ends of the 3rd divider resistance R5 are a capacitor C in parallel also.
Understandably, the linear voltage decreasing circuit at another embodiment of the utility model also can include current foldback circuit and the second current-limiting resistance R6 that is made of switching tube Q2 and detection resistance R 4 simultaneously.
As mentioned above, output voltage and the input voltage of the utility model linear voltage decreasing circuit are linear, and when input voltage existed, output namely had output voltage, and can draw the input voltage situation by the voltage relationship judgement between output and the input, increased the fail safe of equipment.The utility model linear voltage decreasing circuit can be used as a complete circuit, namely as the linear voltage decreasing power supply, for other equipment provide input voltage; And can be used as the part of circuit, for example this circuit can be used between frequency converter busbar voltage and the drive plate reducing busbar voltage and provide input voltage as drive plate.The utility model linear voltage decreasing circuit all can be judged the input voltage situation by the situation of output voltage in above-mentioned two kinds of application, increased the fail safe of equipment.
Need to prove, in the utility model linear voltage decreasing circuit, decompression tube Q1 and switching tube Q2 all can select any realization among triode, IGBT or the MOSFET.
Abovely in conjunction with preferred embodiment the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contains the various modifications of carrying out according to essence of the present utility model.
Claims (10)
1. linear voltage decreasing circuit, it is characterized in that: comprise the first divider resistance R1, the second divider resistance R2, the first voltage-stabiliser tube Z1 and decompression tube Q1, described the first divider resistance R1, the first divider resistance R1 linked to each other with the positive pole of input voltage vin and the positive pole of the first voltage-stabiliser tube Z1 links to each other with the negative pole of input voltage vin after the second divider resistance R2 and the first voltage-stabiliser tube Z1 connected successively, the gate pole of described decompression tube Q1 is connected between described the first divider resistance R1 and the second divider resistance R2, its collector electrode is connected to the positive pole of input voltage vin, and the voltage between the anode of its emitter and the first voltage-stabiliser tube Z1 forms output voltage V out.
2. linear voltage decreasing circuit according to claim 1, it is characterized in that: described the first divider resistance R1 and/or the second divider resistance R2 are variable resistor.
3. linear voltage decreasing circuit according to claim 1, it is characterized in that: also comprise the first diode D1, described the first diode D1 is connected in reverse parallel between the collector and emitter of described decompression tube Q1.
4. linear voltage decreasing circuit according to claim 1, it is characterized in that: also comprise the first current-limiting resistance R3, described the first current-limiting resistance R3 one end is connected between the first divider resistance R1 and the second divider resistance R2, and the other end is connected to the gate pole of decompression tube Q1.
5. linear voltage decreasing circuit according to claim 1 is characterized in that, also comprises the second voltage-stabiliser tube Z2, and the anode of described the second voltage-stabiliser tube Z2 links to each other with the emitter of decompression tube Q1, and the negative electrode of described the second voltage-stabiliser tube Z2 links to each other with the gate pole of decompression tube Q1.
6. linear voltage decreasing circuit according to claim 1, it is characterized in that: also comprise switching tube Q2, reach and detect resistance R 4, the base stage of described switching tube Q2 is connected to the emitter of decompression tube Q1, the collector electrode of described switching tube Q2 is connected between the first divider resistance R1 and the second divider resistance R2, described detection resistance R 4 is connected between the base stage and emitter of described switching tube Q2, and the voltage between the anode of the emitter of described switching tube Q2 and voltage-stabiliser tube Z1 forms output voltage V out.
7. linear voltage decreasing circuit according to claim 1, it is characterized in that: also comprise the second diode D2, the anode of described the second diode D2 links to each other with the positive pole of input voltage vin, and the negative electrode of described the second diode D2 links to each other with the collector electrode of decompression tube Q1.
8. linear voltage decreasing circuit according to claim 7, it is characterized in that: also comprise the second current-limiting resistance R6, described the second current-limiting resistance R6 one end is connected to the anode of the second diode D2, and the other end is connected to the positive pole of input voltage vin.
9. according to claim 1 or 6 described linear voltage decreasing circuit, it is characterized in that: also comprise the 3rd divider resistance R5, described the 3rd divider resistance R5 one end is connected between the first divider resistance R1 and the second divider resistance R2, and the other end is connected to the emitter of described decompression tube Q1.
10. linear voltage decreasing circuit according to claim 9, it is characterized in that: also comprise capacitor C, described capacitor C is connected in parallel on the two ends of described the 3rd divider resistance R5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220340519 CN202750010U (en) | 2012-07-13 | 2012-07-13 | Linear voltage-decreasing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220340519 CN202750010U (en) | 2012-07-13 | 2012-07-13 | Linear voltage-decreasing circuit |
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| CN202750010U true CN202750010U (en) | 2013-02-20 |
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| CN 201220340519 Expired - Fee Related CN202750010U (en) | 2012-07-13 | 2012-07-13 | Linear voltage-decreasing circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391082A (en) * | 2013-07-08 | 2013-11-13 | 辉芒微电子（深圳）有限公司 | Substitution circuit of low-threshold voltage diode |
| CN104868721A (en) * | 2014-02-25 | 2015-08-26 | 安凯(广州)微电子技术有限公司 | Step-down power conversion circuit and system thereof |
| CN111665896A (en) * | 2020-06-24 | 2020-09-15 | 西安微电子技术研究所 | Controllable low-voltage-difference high-power voltage stabilizing circuit of optical isolating switch |
-
2012
- 2012-07-13 CN CN 201220340519 patent/CN202750010U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391082A (en) * | 2013-07-08 | 2013-11-13 | 辉芒微电子（深圳）有限公司 | Substitution circuit of low-threshold voltage diode |
| CN103391082B (en) * | 2013-07-08 | 2016-03-02 | 辉芒微电子（深圳）有限公司 | The replacement circuit of low threshold voltage diode |
| CN104868721A (en) * | 2014-02-25 | 2015-08-26 | 安凯(广州)微电子技术有限公司 | Step-down power conversion circuit and system thereof |
| CN111665896A (en) * | 2020-06-24 | 2020-09-15 | 西安微电子技术研究所 | Controllable low-voltage-difference high-power voltage stabilizing circuit of optical isolating switch |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130220 Termination date: 20200713 |