CN205142033U - Student power supply circuit - Google Patents
Student power supply circuit Download PDFInfo
- Publication number
- CN205142033U CN205142033U CN201520883505.7U CN201520883505U CN205142033U CN 205142033 U CN205142033 U CN 205142033U CN 201520883505 U CN201520883505 U CN 201520883505U CN 205142033 U CN205142033 U CN 205142033U
- Authority
- CN
- China
- Prior art keywords
- diode
- resistance
- voltage
- student
- series
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a student power supply circuit aims at providing a student power supply circuit who has warning, instruction, protects the student of being convenient for to use, and easy the emergence is transshipped when having solved student's operating power, damages the technical problem of circuit easily, and its technical scheme main points are including mains input terminal and DC output, mains input terminal connects in parallel has auto transformer, there is the first voltage display element who is used for showing the voltage that once inclines in auto transformer's the once company of survey, auto transformer's secondary side even has the second voltage display element who is used for showing secondary side voltage, has the effect that the study of being convenient for was used.
Description
Technical field
The utility model relates to a kind of power circuit, and more particularly, it relates to the student power source circuit that a kind of Students ' Learning uses.
Background technology
Student power source is a kind of in laboratory, is connected, high voltage is converted to low-voltage, for the equipment of student experimenting with electrical network 220V alternating current.The electric pressure size that existing student power source adopts the mode control circuit power supply of toggle switch to export, can not realize continuously adjustabe, therefore concerning very inconvenient the use of student, needs to be further improved student power source circuit.
Utility model content
For the deficiency that prior art exists, the purpose of this utility model is to provide a kind of and has voltage continuously adjustabe, show, be convenient to the student power source circuit that student uses.
For achieving the above object, the utility model provides following technical scheme: a kind of student power source circuit, comprise mains electricity input end and DC output end, described mains electricity input end is parallel with autotransformer, described autotransformer once survey the first voltage display unit of being connected with for showing primary side voltage, the secondary side of described autotransformer is connected with the second voltage display unit for showing secondary side voltage;
Described first voltage display unit comprises the 4th diode, the 3rd electric capacity and the first voltmeter, and be parallel to DC output end after described 4th diode, the 3rd capacitances in series, described first voltmeter is parallel to the 3rd electric capacity;
Described second voltage display unit comprises the second diode, the 3rd diode, the second electric capacity, adjustable resistance and the second voltmeter, the secondary side of autotransformer is parallel to after described second diode, the 3rd diodes in reverse series, described second Capacitance parallel connection, on the 3rd diode, is parallel on the second electric capacity after described adjustable resistance and the series connection of the second voltmeter.
Preferably, described mains electricity input end comprises live wire end and zero line side, and described autotransformer is also connected with: over-current detection element, in order to detect live wire end overload current and detection trigger signal;
Comparing unit, is configured with benchmark voltage, receive detection signal, by with benchmark voltage compare after export executive signal;
Alarm unit, is coupled to the output of comparing unit, realizes warning according to executive signal;
Performance element, is coupled to the output of comparing unit, disconnects the connection of live wire end and DC output end when live wire end transships.
Preferably, described comparing unit comprises comparator, the first resistance and the second resistance;
Described first resistance one end connects power supply Vdd, and the other end is connected ground connection after the second resistance, and described first resistance is connected the inverting input of comparator with the node of the second resistance;
The in-phase input end of described comparator is coupled to detecting unit.
Preferably, described over-current detection element is tongue tube, and described tongue tube has impedance part and switch portion, and the two ends of described impedance part are series between live wire end and DC output end, and described switch portion is series between the in-phase input end of comparing unit and power supply Vdd.
Preferably, the in-phase input end of described comparator is also in series with the first diode, is connected with the first electric capacity between the negative electrode of described diode and earth terminal.
Preferably, described alarm unit comprises the buzzer warning module and indicator light alarm module that respond executive signal simultaneously.
Preferably, described performance element comprises relay and the second triode, the described base stage of the second triode is connected with the output of comparing unit, coil one end of relay connects power supply Vdd, the other end connect the second triode collector electrode, the grounded emitter of the second triode, the switch contact of described relay is series between live wire end and DC output end.
Compared with prior art, the beneficial effects of the utility model are: by using autotransformer, thus the toggle switch eliminated in original circuit, thus realize voltage continuously adjustabe, adopt adjustable resistance to realize carrying out dividing potential drop to voltage in circuit, voltmeter can show voltage swing simultaneously, simple operation, be suitable for student to use, eliminate toggle switch, the cost of saving simultaneously.
Accompanying drawing explanation
Fig. 1 is the auto transformer circuits structure chart of the utility model embodiment;
Fig. 2 is the remaining circuit schematic diagram of the utility model embodiment.
L, live wire end in figure; N, zero line side; DC-out, DC output end; KR, tongue tube; R, impedance part; K, switch portion; 1, comparing unit; A, comparator; R1, the first resistance; R2, the second resistance; 2, alarm unit; 21, buzzer warning module; 22, indicator light alarm module; 3, performance element; K, relay; Q2, the second triode; D1, the first diode D2, the second diode; C1, the first electric capacity; T, autotransformer; 4, the first voltage display unit; 5, the second voltage display unit.
Embodiment
Referring to figs. 1 through Fig. 2, the utility model embodiment is described further.
As shown in Figure 1, a kind of student power source circuit, comprise mains electricity input end and DC output end DC-out, described mains electricity input end is parallel with autotransformer T1, described autotransformer T1 once surveys the first voltage display unit 4 be connected with for showing primary side voltage, and the secondary side of described autotransformer T1 is connected with the second voltage display unit 5 for showing secondary side voltage; Described first voltage display unit 4 comprises the 4th diode, the 3rd electric capacity and the first voltmeter, and be parallel to DC output end DC-out after described 4th diode, the 3rd capacitances in series, described first voltmeter is parallel to the 3rd electric capacity; Described second voltage display unit 5 comprises the second diode D2, the 3rd diode, the second electric capacity, adjustable resistance and the second voltmeter, the secondary side of autotransformer T1 is parallel to after described second diode D2, the 3rd diodes in reverse series, described second Capacitance parallel connection, on the 3rd diode, is parallel on the second electric capacity after described adjustable resistance and the series connection of the second voltmeter.
As shown in Figure 1, the first voltage display unit 4 comprises the 4th diode and the 3rd electric capacity, and the second voltmeter is connected on direct current output loop, can in order to show the voltage swing once surveyed.The regulator rectifier circuit that second voltage display unit 5 comprises the second diode D2 in Fig. 1, the 3rd diode, the second electric capacity are formed, can be regulated electric current and voltage by adjustable resistance and potentiometer Rp, voltmeter is connected on potentiometer, thus can be regulated by the indicated value of regulator potentiometer to voltmeter by volume, thus Students ' Learning is can be used for use.Student is easy to use, and structure is simple, with low cost.
By using autotransformer T1, thus the toggle switch eliminated in original circuit, thus realize voltage continuously adjustabe, adopt adjustable resistance to realize carrying out dividing potential drop to voltage in circuit simultaneously, voltmeter can show voltage swing, simple operation, is suitable for student and uses, eliminate toggle switch, the cost of saving simultaneously.
For in student power source circuit, in order to can be good at as student provides experimental situation, the operating process of student to the equipment of use is needed to have the training of certain hour and be familiar with.And for beginner, use procedure is also lack of standardization, easily cause fault, occur the situation of overcurrent and overload, cause circuit to recover, as shown in Figure 2, circuit also comprises live wire end L, zero line side N and DC output end DC-out, and live wire end L is connected with DC output end DC-out through diode rectification by the coil of transformer again, wherein also comprises, over-current detection element, in order to detect live wire end L overload current and detection trigger signal; Over-current detection element can adopt tongue tube KR or overcurrent relay K, and this programme prioritizing selection adopts tongue tube KR device to realize the detection of current overload, and can effectively reduce costs, detection sensitivity is higher simultaneously, response speed block.
Comparing unit 1, is configured with benchmark voltage, receive detection signal, by with benchmark voltage compare after export executive signal; Comparing unit 1 comprises comparator A, the first resistance R1 and the second resistance R2; Described first resistance R1 one end connects power supply Vdd, and the other end is connected ground connection after the second resistance R2, and described first resistance R1 is connected the inverting input of comparator A with the node of the second resistance R2, the in-phase input end of described comparator A is coupled to detecting unit.Stable reference voltage is provided by the dividing potential drop of the first resistance R1 and the second resistance R2.
Power supply Vdd can be produced by battery, and the power supply of comparator A directly can provide DC power supply by button electronics or battery.Simultaneously by the power supply of power supply, comparing unit 1 is started working, when live wire end L is due to student's misoperation, the resistance of access is too small, and the electric current of formation is excessive, and now electric current is just directly loaded on tongue tube KR, over-current detection element is tongue tube KR, described tongue tube KR has impedance part r and switch portion k, and the two ends of described impedance part r are series between live wire end L and DC output end DC-out, and described switch portion k is series between the in-phase input end of comparing unit 1 and power supply Vdd.The impedance part r of tongue tube KR detects current course, now the switch portion k of tongue tube KR just direct in-phase input end power supply Vdd being linked into comparator A, and now the output of comparator A exports high level, thus can drive functional unit.
The in-phase input end of comparator A is also in series with the first diode D1, is connected with the first electric capacity C1 between the negative electrode of described diode and earth terminal.First diode D1 and the first electric capacity C1 can play the stable effect of detection to detection signal.
Functional unit is as follows: alarm unit 2, is coupled to the output of comparing unit 1, realizes warning according to executive signal; Alarm unit 2 comprises the buzzer warning module 21 and indicator light alarm module 22 that respond executive signal simultaneously.Buzzer warning module 21 comprises the first triode Q1, buzzer SP and the 5th resistance, by the Current limited Control first triode Q1 conducting of the 5th resistance, thus buzzer call is warned, indicator light alarm module 22 is now also had to comprise the 3rd resistance R3 and LED, when comparator A output is high level, both warn simultaneously.
Performance element 3, is coupled to the output of comparing unit 1, disconnects the connection of live wire end L and DC output end DC-out when live wire end L transships.Performance element 3 comprises relay K and the second triode Q2, the base stage of described second triode Q2 is connected with the output of comparing unit 1, coil one end of relay K connects power supply Vdd, the other end connect the second triode Q2 collector electrode, the grounded emitter of the second triode Q2, the switch contact of described relay K is series between live wire end L and DC output end DC-out.Directly DC output end DC-out is cut off by the switch contact of relay K, prevent current overload.Play the effect of security protection.
The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (7)
1. a student power source circuit, comprise mains electricity input end and DC output end, it is characterized in that: described mains electricity input end is parallel with autotransformer, described autotransformer once survey the first voltage display unit of being connected with for showing primary side voltage, the secondary side of described autotransformer is connected with the second voltage display unit for showing secondary side voltage;
Described first voltage display unit comprises the 4th diode, the 3rd electric capacity and the first voltmeter, and be parallel to DC output end after described 4th diode, the 3rd capacitances in series, described first voltmeter is parallel to the 3rd electric capacity;
Described second voltage display unit comprises the second diode, the 3rd diode, the second electric capacity, adjustable resistance and the second voltmeter, the secondary side of autotransformer is parallel to after described second diode, the 3rd diodes in reverse series, described second Capacitance parallel connection, on the 3rd diode, is parallel on the second electric capacity after described adjustable resistance and the series connection of the second voltmeter.
2. student power source circuit according to claim 1, is characterized in that: described mains electricity input end comprises live wire end and zero line side, described autotransformer is also connected with: over-current detection element, in order to detect live wire end overload current and detection trigger signal;
Comparing unit, is configured with benchmark voltage, receive detection signal, by with benchmark voltage compare after export executive signal;
Alarm unit, is coupled to the output of comparing unit, realizes warning according to executive signal;
Performance element, is coupled to the output of comparing unit, disconnects the connection of live wire end and DC output end when live wire end transships.
3. student power source circuit according to claim 2, is characterized in that: described comparing unit comprises comparator, the first resistance and the second resistance;
Described first resistance one end connects power supply Vdd, and the other end is connected ground connection after the second resistance, and described first resistance is connected the inverting input of comparator with the node of the second resistance;
The in-phase input end of described comparator is coupled to detecting unit.
4. student power source circuit according to claim 2, it is characterized in that: described over-current detection element is tongue tube, described tongue tube has impedance part and switch portion, the two ends of described impedance part are series between live wire end and DC output end, and described switch portion is series between the in-phase input end of comparing unit and power supply Vdd.
5. student power source circuit according to claim 3, is characterized in that: the in-phase input end of described comparator is also in series with the first diode, is connected with the first electric capacity between the negative electrode of described diode and earth terminal.
6. student power source circuit according to claim 2, is characterized in that: described alarm unit comprises the buzzer warning module and indicator light alarm module that respond executive signal simultaneously.
7. student power source circuit according to claim 2, it is characterized in that: described performance element comprises relay and the second triode, the described base stage of the second triode is connected with the output of comparing unit, coil one end of relay connects power supply Vdd, the other end connects the collector electrode of the second triode, the grounded emitter of the second triode, the switch contact of described relay is series between live wire end and DC output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520883505.7U CN205142033U (en) | 2016-01-25 | 2016-01-25 | Student power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520883505.7U CN205142033U (en) | 2016-01-25 | 2016-01-25 | Student power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205142033U true CN205142033U (en) | 2016-04-06 |
Family
ID=55627785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520883505.7U Expired - Fee Related CN205142033U (en) | 2016-01-25 | 2016-01-25 | Student power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205142033U (en) |
-
2016
- 2016-01-25 CN CN201520883505.7U patent/CN205142033U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108226593B (en) | Electric energy meter and electricity larceny prevention detection method thereof | |
| CN203519761U (en) | Anti-error-connection detecting circuit for zero line and live line of AC power | |
| CN204287418U (en) | A kind of circuit breaker switch state pick-up unit | |
| CN205142033U (en) | Student power supply circuit | |
| CN209881386U (en) | Protection circuit for electrification of shell | |
| CN204992521U (en) | Electric energy meter that single -phase electric energy meter operated a switch control circuit and made with this circuit | |
| CN202948336U (en) | Fluid position display controller | |
| CN214013869U (en) | Reliable single-phase wiring detection circuit of commercial power | |
| CN110726956B (en) | Leakage detection circuit and device | |
| CN204720702U (en) | A kind of voltage fluctuation protection alarm socket | |
| CN111157888B (en) | Intermediate relay contact point rapid detector and detection method thereof | |
| CN203929854U (en) | Voltage magnitude testing circuit | |
| CN204720956U (en) | A kind of three-phase uninterrupted power supply with lack detection circuit | |
| CN211426729U (en) | Fire detection alarm electric quantity detection circuit and fire detection alarm | |
| CN211979134U (en) | Intermediate relay contact point short-term test appearance | |
| CN208351325U (en) | A kind of power-fail detection circuit applied to Environment Monitoring Unit | |
| CN208672722U (en) | A kind of DC load fault condition detection circuit | |
| CN103389401B (en) | A kind of electric network voltage detection device | |
| CN2694288Y (en) | Switch cabinet leakage current checking and warning device | |
| CN1124493C (en) | Chargeable cell test loop contact resistance monitoring method | |
| CN2286881Y (en) | Detection device for preventing from fraudulent use of electricity | |
| CN205158579U (en) | Motor electric current demodulation alarm | |
| CN212008880U (en) | Electricity grounding detection system | |
| CN204462240U (en) | The ac power supply line state detection circuit of high sensitivity and high input impedance | |
| CN104597203A (en) | An automatic exhaust gas monitoring and alarming device |
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: 20160406 Termination date: 20180125 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |