CN204089623U - The power circuit of two kinds of voltages can be provided - Google Patents
The power circuit of two kinds of voltages can be provided Download PDFInfo
- Publication number
- CN204089623U CN204089623U CN201420431306.8U CN201420431306U CN204089623U CN 204089623 U CN204089623 U CN 204089623U CN 201420431306 U CN201420431306 U CN 201420431306U CN 204089623 U CN204089623 U CN 204089623U
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- triode
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- diode
- operational amplifier
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Abstract
The utility model discloses a kind of power circuit providing two kinds of voltages, comprise switch S 2, current rectifying and wave filtering circuit and serial voltage regulation circuit, described current rectifying and wave filtering circuit forms primarily of transformer T, rectifier bridge 4-5408 and electrochemical capacitor C1; Described serial voltage regulation circuit primarily of triode T1, T2, resistance R4, R7, R8, R9, voltage-stabiliser tube 2CW231 and integrated operational amplifier LM324 forms; Described switch S 2 is in parallel with resistance R7.The utility model can provide 6V and 12V two kinds of supply voltages, and teaching teacher can carry out voltage switching to power circuit as required at any time, to meet the needs of current education experiment, saves the time changing circuit board, saves the time of education experiment simultaneously.The utility model structure is simple, is convenient to manufacture, and is concentrated on a circuit board by two kinds of voltages, effectively saves cost of manufacture.
Description
Technical field
The utility model is a kind of power circuit providing two kinds of voltages specifically, belongs to power circuit technical field.
Background technology
Power circuit refers to the circuit design of the power unit being supplied to power consumption equipment supply of electric power, and common power circuit has AC power circuit and DC power supply circuit.DC power supply circuit is divided into Switching Power Supply and unswitched power two kinds of forms, and circuit also differs widely.Switching Power Supply does not generally use transformer; Unswitched power is traditional design, the mode using transformer to carry out rectifying and wave-filtering again after transformation in power circuit more.
Conventional unswitched power DC power supply circuit in teaching, this power circuit generally can only provide a kind of voltage, but in education experiment, often can use the power circuit of different voltage, cannot meet the needs to two kinds of supply voltages in teaching circuit.Generally, teacher is for meeting classroom needs in teaching, two power supply circuit boards can be carried, to complete education experiment, but for teaching teacher, carry two circuit boards on the one hand cumbersome, in Experiment of Electrical Circuits, constantly change circuit board on the other hand as required also cumbersome, and lose time.
Summary of the invention
For above-mentioned prior art Problems existing, the utility model provides a kind of power circuit providing two kinds of voltages, can provide two kinds of voltages simultaneously, meets the needs to two kinds of supply voltages in teaching circuit, facilitates education experiment and carry.
To achieve these goals, a kind of power circuit providing two kinds of voltages of the utility model, comprises switch S 2, current rectifying and wave filtering circuit and serial voltage regulation circuit, and described current rectifying and wave filtering circuit forms primarily of transformer T, rectifier bridge 4-5408 and electrochemical capacitor C1; Described rectifier bridge 4-5408 is composed in series by diode D1, D2, D3 and D4; Described transformer T mono-terminating diode D2 positive pole, another terminating diode D3 positive pole, described diode D2 negative pole connects D4 positive pole through electrochemical capacitor C1, described diode D4 plus earth;
Described serial voltage regulation circuit primarily of triode T1, T2, resistance R4, R7, R8, R9, voltage-stabiliser tube 2CW231 and integrated operational amplifier LM324 forms; 1 pin of described integrated operational amplifier LM324 connects triode T1 base stage through resistance R4, described triode T1 emitter connects triode T2 base stage, described triode T2 collector electrode connects diode D2 negative pole, triode T2 emitter connects output, and described triode T1 collector electrode is connected on the circuit between diode D2 and triode T2 collector electrode; 2 pins of described resistance R7 mono-termination integrated operational amplifier LM324, another termination triode T2 emitter, 2 pins of described resistance R8 one end difference connecting resistance R7 and integrated operational amplifier LM324, other end ground connection; 3 pins of described integrated operational amplifier LM324 are through voltage-stabiliser tube 2CW231 ground connection, and 4 pins of integrated operational amplifier LM324 connect diode D2 negative pole, the 8 pin ground connection of integrated operational amplifier LM324; Described resistance R9 is parallel on 4 pins of integrated operational amplifier LM324 and the circuit of 3 pins;
Described switch S 2 is in parallel with resistance R7.
Further, also comprise power protecting circuit, described power protecting circuit is primarily of triode T3, and resistance R1, R2, R3, R5, R6 and diode D5 form; Described resistance R1 one end connects triode T1 collector electrode, triode T2 collector electrode and diode D2 negative pole respectively, and the other end connects diode D5 positive pole through resistance R3; Described resistance R2 mono-end is connected on the circuit between resistance R1 and R3, and the other end connects diode D5 negative pole and triode T3 base stage respectively, and through resistance R5 ground connection; Described resistance R6 one end is connecting resistance R3 and triode T2 emitter respectively, and the other end meets triode T3 emitter and resistance R7 respectively; Described triode T3 collector connecting transistor T1 base stage.
Further, also comprise electrochemical capacitor C2, described electrochemical capacitor C2 mono-terminating resistor R8, other end connecting resistance R7.
Compared with prior art, the utility model can provide 6V and 12V two kinds of supply voltages, and teaching teacher can carry out voltage switching to power circuit, as required at any time to meet the needs of current education experiment, save the time changing circuit board, save the time of education experiment simultaneously.The utility model structure is simple, is convenient to manufacture, and is concentrated on a circuit board by two kinds of voltages, effectively saves cost of manufacture.
Accompanying drawing explanation
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, a kind of power circuit providing two kinds of voltages of the utility model, comprises switch S 2, current rectifying and wave filtering circuit and serial voltage regulation circuit, and described current rectifying and wave filtering circuit forms primarily of transformer T, rectifier bridge 4-5408 and electrochemical capacitor C1; Described rectifier bridge 4-5408 is composed in series by diode D1, D2, D3 and D4; Described transformer T mono-terminating diode D2 positive pole, another terminating diode D3 positive pole, described diode D2 negative pole connects D4 positive pole through electrochemical capacitor C1, described diode D4 plus earth;
Described serial voltage regulation circuit primarily of triode T1, T2, resistance R4, R7, R8, R9, voltage-stabiliser tube 2CW231 and integrated operational amplifier LM324 forms; 1 pin of described integrated operational amplifier LM324 connects triode T1 base stage through resistance R4, described triode T1 emitter connects triode T2 base stage, described triode T2 collector electrode connects diode D2 negative pole, triode T2 emitter connects output, and described triode T1 collector electrode is connected on the circuit between diode D2 and triode T2 collector electrode; 2 pins of described resistance R7 mono-termination integrated operational amplifier LM324, another termination triode T2 emitter, 2 pins of described resistance R8 one end difference connecting resistance R7 and integrated operational amplifier LM324, other end ground connection; 3 pins of described integrated operational amplifier LM324 are through voltage-stabiliser tube 2CW231 ground connection, and 4 pins of integrated operational amplifier LM324 connect diode D2 negative pole, the 8 pin ground connection of integrated operational amplifier LM324; Described resistance R9 is parallel on 4 pins of integrated operational amplifier LM324 and the circuit of 3 pins;
Described switch S 2 is in parallel with resistance R7.
Because the Correctional tube of series regulator and triode T1, T2 and load are in series, once there is the situation of output overload or short circuit, triode T1, T2 will bear very large voltage and current, thus cause the power consumption of triode T1, T2 to exceed its rated value and heating burnout.For avoiding the generation of above-mentioned phenomenon, the utility model improves technique scheme, is provided with power protecting circuit, and described power protecting circuit is primarily of triode T3, and resistance R1, R2, R3, R5, R6 and diode D5 form; Described resistance R1 one end connects triode T1 collector electrode, triode T2 collector electrode and diode D2 negative pole respectively, and the other end connects diode D5 positive pole through resistance R3; Described resistance R2 mono-end is connected on the circuit between resistance R1 and R3, and the other end connects diode D5 negative pole and triode T3 base stage respectively, and through resistance R5 ground connection; Described resistance R6 one end is connecting resistance R3 and triode T2 emitter respectively, and the other end meets triode T3 emitter and resistance R7 respectively; Described triode T3 collector connecting transistor T1 base stage, effectively prevent and cause damage to circuit because electric current is excessive, extends the useful life of power circuit.
As the further improvement of the utility model to technique scheme, also comprise electrochemical capacitor C2, described electrochemical capacitor C2 mono-terminating resistor R8, other end connecting resistance R7.
Operationally, the alternating current of line voltage through transformer T transformation, then through the rectification of bridge rectifier 4-5408 and the filtering of electrochemical capacitor C1, obtains direct voltage UI to the utility model.When line voltage or load current change (UI increases or IL reduces), when causing output voltage UO to increase, the corresponding increase of sampling voltage through resistance R7, R8, so the output voltage of LM324 reduces, the UCE2 of triode T2 increases, output voltage (UO=UI-UCE2) is declined, and result makes output voltage UO substantially remain unchanged, and above-mentioned pressure regulation process is negative feedback process.Otherwise because certain reason makes output voltage UO decline, by negative feedback process, make UCE2 reduce, thus make output voltage UO increase, result makes to export electric UO and substantially keeps constant.
When in the normal situation of load current, triode T3 pipe ends, and triode T1, T2 are working properly; when output current IO increases, circuit will produce following positive feedback, and output current IO increases; voltage on resistance R6 increases, because UB3=UR6-UD5, so UB3 increases; IC3 increases thereupon; the output of LM324 is shunted by triode T3, and output voltage reduces, and the internal resistance of triode T1, T2 increases; restriction output circuit increases further, power circuit is served to the effect of protection very well.
Why the utility model can provide the voltage computational methods of 6V and 12V:
Wherein UZ is voltage-stabiliser tube voltage stabilizing value, gets UZ=6V;
The R0=0 when S2 closes, so UO=UZ=6V;
The R0=R7 when S2 disconnects, so UO=2UZ=12V.
Claims (3)
1. can provide a power circuit for two kinds of voltages, it is characterized in that, comprise switch S 2, current rectifying and wave filtering circuit and serial voltage regulation circuit, described current rectifying and wave filtering circuit forms primarily of transformer T, rectifier bridge 4-5408 and electrochemical capacitor C1; Described rectifier bridge 4-5408 is composed in series by diode D1, D2, D3 and D4; Described transformer T mono-terminating diode D2 positive pole, another terminating diode D3 positive pole, described diode D2 negative pole connects D4 positive pole through electrochemical capacitor C1, described diode D4 plus earth;
Described serial voltage regulation circuit primarily of triode T1, T2, resistance R4, R7, R8, R9, voltage-stabiliser tube 2CW231 and integrated operational amplifier LM324 forms; 1 pin of described integrated operational amplifier LM324 connects triode T1 base stage through resistance R4, described triode T1 emitter connects triode T2 base stage, described triode T2 collector electrode connects diode D2 negative pole, triode T2 emitter connects output, and described triode T1 collector electrode is connected on the circuit between diode D2 and triode T2 collector electrode; 2 pins of described resistance R7 mono-termination integrated operational amplifier LM324, another termination triode T2 emitter, 2 pins of described resistance R8 one end difference connecting resistance R7 and integrated operational amplifier LM324, other end ground connection; 3 pins of described integrated operational amplifier LM324 are through voltage-stabiliser tube 2CW231 ground connection, and 4 pins of integrated operational amplifier LM324 connect diode D2 negative pole, the 8 pin ground connection of integrated operational amplifier LM324; Described resistance R9 is parallel on 4 pins of integrated operational amplifier LM324 and the circuit of 3 pins;
Described switch S 2 is in parallel with resistance R7.
2. a kind of power circuit providing two kinds of voltages according to claim 1, is characterized in that, also comprise power protecting circuit, and described power protecting circuit is primarily of triode T3, and resistance R1, R2, R3, R5, R6 and diode D5 form; Described resistance R1 one end connects triode T1 collector electrode, triode T2 collector electrode and diode D2 negative pole respectively, and the other end connects diode D5 positive pole through resistance R3; Described resistance R2 mono-end is connected on the circuit between resistance R1 and R3, and the other end connects diode D5 negative pole and triode T3 base stage respectively, and through resistance R5 ground connection; Described resistance R6 one end is connecting resistance R3 and triode T2 emitter respectively, and the other end meets triode T3 emitter and resistance R7 respectively; Described triode T3 collector connecting transistor T1 base stage.
3. a kind of power circuit providing two kinds of voltages according to claim 1 and 2, is characterized in that, also comprise electrochemical capacitor C2, described electrochemical capacitor C2 mono-terminating resistor R8, other end connecting resistance R7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420431306.8U CN204089623U (en) | 2014-07-31 | 2014-07-31 | The power circuit of two kinds of voltages can be provided |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420431306.8U CN204089623U (en) | 2014-07-31 | 2014-07-31 | The power circuit of two kinds of voltages can be provided |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204089623U true CN204089623U (en) | 2015-01-07 |
Family
ID=52182289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420431306.8U Expired - Fee Related CN204089623U (en) | 2014-07-31 | 2014-07-31 | The power circuit of two kinds of voltages can be provided |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204089623U (en) |
-
2014
- 2014-07-31 CN CN201420431306.8U patent/CN204089623U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20150731 |
|
| EXPY | Termination of patent right or utility model |