CN201563058U - Direct-current voltage-stabilizing supply unit - Google Patents
Direct-current voltage-stabilizing supply unit Download PDFInfo
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- CN201563058U CN201563058U CN2009202820599U CN200920282059U CN201563058U CN 201563058 U CN201563058 U CN 201563058U CN 2009202820599 U CN2009202820599 U CN 2009202820599U CN 200920282059 U CN200920282059 U CN 200920282059U CN 201563058 U CN201563058 U CN 201563058U
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Abstract
The utility model discloses a direct-current voltage-stabilizing supply unit which comprises a main circuit, wherein the main circuit also comprises an overcurrent protection circuit. The adopted overcurrent protection circuit comprises a current sampling element, a triode and a capacitor. The capacitor is charged by the current sampling element, and voltage generated when the capacitor is discharged is added onto the base electrode and the emitter electrode of the NPN type triode. When the main circuit is connected with a load for working, the charging time of the capacitor is set to be greater than the starting time, and the triode is in a cut-off state. Once the circuit generates short circuit or a load fault (such as the rotation blocking of a motor), voltage at both ends of the capacitor reaches the conduction voltage of the triode, the triode is conducted, and a voltage stabilizer outputs reference voltage, thereby preventing oversize current and protecting the components of the circuit. The utility model has simple structure, reasonable design and convenient use, and protects the components of the circuit effectively.
Description
Technical field
The utility model relates to a kind of circuit arrangement, relates in particular to a kind of DC voltage-stablized source apparatus.
Background technology
Often run into the situation of using DC power supply in work at ordinary times, requiring for power source performance is not very high occasion, and the following integrated stable voltage circuit of normal employing comprises transformation, rectification, filtering, several parts of voltage stabilizing.Integrated stable voltage circuit also claims integrated voltage adjuster, and when input voltage or output current changed within the specific limits, its output voltage remained unchanged.It has been widely used in the various electronic equipments, to replace the stabilized voltage power supply of discrete device assembling.But in practical work process, load short circuits or DC motor stall often occur, the situation that overcurrent burns voltage stabilizing circuit, rectification circuit takes place.Therefore, voltage-stabilized power supply circuit is designed to protect the circuit of power supply apparatus particularly important.
The utility model content
Technical problem to be solved in the utility model provides a kind of DC voltage-stablized source apparatus simple in structure, esy to use, safe and reliable.
For solving the problems of the technologies described above, the technical solution of the utility model is: a main circuit, described main circuit comprise transformation module, rectification module, filtration module and the Voltage stabilizing module that is linked in sequence, and described main circuit is provided with cathode output end and cathode output end; Described DC voltage-stablized source apparatus also comprises an overcurrent protection module that is connected on the described main circuit.
As a kind of optimized technical scheme, described overcurrent protection module comprises the current sampling element, and described current sampling element connected in series is between the cathode output end and common ground end of described main circuit; Triode, the base stage of described triode is connected in the cathode output end of described main circuit by a base stage branch road, the emitter of described triode is connected in the common ground end of described main circuit by an emitter branch, and the collector electrode of described triode is connected in the cathode output end of described main circuit by a collector electrode branch road; Electric capacity, described electric capacity one end is connected other end ground connection with described base stage branch road.
As a kind of optimized technical scheme, described triode is a NPN type triode.
As a kind of optimized technical scheme, described base stage branch road comprises first resistance and second resistance of series connection, and an end of described electric capacity is connected between described first resistance and second resistance.
As a kind of optimized technical scheme, described current sampling element is resistance or Hall element.
After having adopted technique scheme, the beneficial effects of the utility model are: because the main circuit of this DC voltage-stablized source apparatus comprises a current foldback circuit, prevent that by current foldback circuit main circuit current is excessive, thus the protective circuit components and parts.The current foldback circuit that is adopted comprises: the current sampling element, and described current sampling element connected in series is between the cathode output end and common ground end of described main circuit; Triode, the base stage of described triode is connected in the cathode output end of described main circuit by a base stage branch road, the emitter of described triode is connected in the common ground end of described main circuit by an emitter branch, and the collector electrode of described triode is connected in the cathode output end of described main circuit by a collector electrode branch road; Electric capacity, described electric capacity one end is connected other end ground connection with described base stage branch road.So; when main circuit inserts loaded work piece; capacitor charging time is set greater than start-up time; triode is cut-off state, in case circuit is short-circuited or during load faulty (as the motor stall), the electric capacity both end voltage reaches the conducting voltage of triode; the triode conducting; pressurizer output reference voltage then, thus prevent that electric current is excessive, the components and parts of protective circuit.The utility model is simple in structure, and is reasonable in design, easy to use, effectively protected the circuit elements device.
Description of drawings
Accompanying drawing is the circuit structure diagram of the utility model embodiment.
Embodiment
DC voltage-stablized source apparatus as shown in drawings, comprising: a main circuit, described main circuit comprise transformer T, rectifier U, filter C1 and the three-terminal voltage regulator CW317 that is linked in sequence, and described main circuit is provided with cathode output end and cathode output end; Described DC voltage-stablized source apparatus also comprises an overcurrent protection module that is connected on the described main circuit.
Described overcurrent protection module comprises: the current sampling element, described current sampling element can adopt resistance or Hall element, the preferred sample resistance R4 of present embodiment, described sample resistance R4 are series between the cathode output end and common ground end of described main circuit; NPN type triode V1, the base stage of described NPN type triode V1 is connected in the cathode output end of described main circuit by a base stage branch road, the emitter of described NPN type triode V1 is connected in the common ground end of described main circuit by an emitter branch, and the collector electrode of described NPN type triode V1 is connecting the adjustment end of three-terminal voltage regulator CW317.Described base stage branch road comprises first resistance R 2 and second resistance R 3 of series connection, and an end of described capacitor C 2 is connected between described first resistance R 2 and second resistance R 3.
In the present embodiment: selected triode adopts the NPN type triode that satisfies oppositely withstand voltage and impulse current; The effect of first resistance R 2 mainly is the base current of restriction NPN type triode, generally gets 1～2k Ω; Second resistance R 3 " sample resistance R4 and by the value of second resistance R 3 and capacitor C 2 is set, is the charging interval greater than load start-up time.
Use principle of the present utility model: the current foldback circuit principle is as shown in the empty frame of accompanying drawing.When power work, pressurizer CW317 output output forward dc voltage, load (as motor) begins to start.Because it is bigger that load starts transient current, flows through sample resistance R4, and through 2 chargings of 3 pairs of capacitor C of second resistance R.By setting the value of second resistance R 3, capacitor C 2, make the charging interval greater than load start-up time, so NPN type triode V2 is in cut-off state, after load started to stable state, electric current returned to operating current.In case load is short-circuited or stall (as the motor stall), make capacitor C 2 both end voltage reach the conducting voltage of NPN type triode V2, then NPN type triode V2 conducting forces the output voltage of three-terminal voltage regulator CW317 to reduce to reference voltage 1.25V.Thereby when load was short-circuited with stall, output voltage reduced, with the protective circuit components and parts.
The utility model is reasonable in design, and is simple in structure, easy to use, effective, and cost is low.
Present embodiment is to play overcurrent protection in the small-power DC power supply; in the DC motor circuit and in dc charging circuit, utilize design of the present invention also can play overcurrent protection; and circuit structure is simple; effective; cost is low, and capacity that can corresponding increasing element when power is big gets final product.
Claims (5)
1. DC voltage-stablized source apparatus comprises
A main circuit, described main circuit comprise transformation module, rectification module, filtration module and the Voltage stabilizing module that is linked in sequence, and described main circuit is provided with cathode output end and cathode output end; It is characterized in that:
Described DC voltage-stablized source apparatus also comprises an overcurrent protection module that is connected on the described main circuit.
2. DC voltage-stablized source apparatus as claimed in claim 1 is characterized in that: described overcurrent protection module comprises
The current sampling element, described current sampling element connected in series is between the cathode output end and common ground end of described main circuit;
Triode, the base stage of described triode is connected in the cathode output end of described main circuit by a base stage branch road, the emitter of described triode is connected in the common ground end of described main circuit by an emitter branch, and the collector electrode of described triode is connected in the cathode output end of described main circuit by a collector electrode branch road;
Electric capacity, described electric capacity one end is connected other end ground connection with described base stage branch road.
3. DC voltage-stablized source apparatus as claimed in claim 2 is characterized in that: described triode is a NPN type triode.
4. DC voltage-stablized source apparatus as claimed in claim 3 is characterized in that: described base stage branch road comprises first resistance and second resistance of series connection, and an end of described electric capacity is connected between described first resistance and second resistance.
5. DC voltage-stablized source apparatus as claimed in claim 4 is characterized in that: described current sampling element is resistance or Hall element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202820599U CN201563058U (en) | 2009-11-24 | 2009-11-24 | Direct-current voltage-stabilizing supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202820599U CN201563058U (en) | 2009-11-24 | 2009-11-24 | Direct-current voltage-stabilizing supply unit |
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| Publication Number | Publication Date |
|---|---|
| CN201563058U true CN201563058U (en) | 2010-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202820599U Expired - Fee Related CN201563058U (en) | 2009-11-24 | 2009-11-24 | Direct-current voltage-stabilizing supply unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101977473A (en) * | 2010-11-16 | 2011-02-16 | 山东华盈电力能源发展有限公司 | Indoor light-emitting diode (LED) constant current illuminating lamp |
| CN102751969A (en) * | 2012-07-11 | 2012-10-24 | 上海先甲新能源科技有限公司 | Output short-circuit protection circuit of low-power photovoltaic controller |
| CN103001203A (en) * | 2012-10-23 | 2013-03-27 | 广州金升阳科技有限公司 | Current-limiting circuit |
| CN103840492A (en) * | 2012-11-21 | 2014-06-04 | 江苏天宇光伏科技有限公司 | Separation type solar power supply mobile power supply |
-
2009
- 2009-11-24 CN CN2009202820599U patent/CN201563058U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101977473A (en) * | 2010-11-16 | 2011-02-16 | 山东华盈电力能源发展有限公司 | Indoor light-emitting diode (LED) constant current illuminating lamp |
| CN102751969A (en) * | 2012-07-11 | 2012-10-24 | 上海先甲新能源科技有限公司 | Output short-circuit protection circuit of low-power photovoltaic controller |
| CN102751969B (en) * | 2012-07-11 | 2015-01-21 | 上海先甲新能源科技有限公司 | Output short-circuit protection circuit and method of low-power photovoltaic controller |
| CN103001203A (en) * | 2012-10-23 | 2013-03-27 | 广州金升阳科技有限公司 | Current-limiting circuit |
| CN103001203B (en) * | 2012-10-23 | 2015-06-17 | 广州金升阳科技有限公司 | Current-limiting circuit |
| CN103840492A (en) * | 2012-11-21 | 2014-06-04 | 江苏天宇光伏科技有限公司 | Separation type solar power supply mobile power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100825 Termination date: 20131124 |