CN202841601U - Constant-current power supply circuit - Google Patents
Constant-current power supply circuit Download PDFInfo
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- CN202841601U CN202841601U CN 201220375923 CN201220375923U CN202841601U CN 202841601 U CN202841601 U CN 202841601U CN 201220375923 CN201220375923 CN 201220375923 CN 201220375923 U CN201220375923 U CN 201220375923U CN 202841601 U CN202841601 U CN 202841601U
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- circuit
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Abstract
The utility model brings forward a constant-current power supply circuit comprising a resistance-capacitance reduction voltage circuit formed by parallel connection of a first resistor and a first capacitor as well as a rectification filter circuit connected with the resistance-capacitance reduction voltage circuit. Beside, the constant-current power supply circuit also includes a constant current circuit connected with the rectification filter circuit; and the constant current circuit consists of a second resistor, a third resistor, a voltage regulator tube and a triode. Specifically, the second resistor is connected to a common contact of a positive electrode of the rectification filter circuit and one end of a load; and the other end of the second resistor is connected to a common contact of a cathode of the voltage regulator tube and a base electrode circuit of the triode. A collector electrode of the triode is connected with the other end of the load. One end of the third resistor is connected to a common contact of a circuit by connection of an emitting electrode of the triode and a reference electrode of the voltage regulator tube; and the other end of the third resistor is connected with an anode of the voltage regulator tube and then is connected to a negative electrode of the rectification filter circuit. According to the utility model, the provided constant-current power supply circuit has advantages of low cost, simple circuit and high constant current efficiency.
Description
Technical field
The utility model relates to a kind of constant-current power supply circuit.
Background technology
The power supply circuits of at present LED illumination are divided into two kinds, a kind of be behind the traditional resistance-capacitance depressurization to the LED power supply, circuit is simple but can not constant current, electric current can change with input voltage and LED warming-up effect, cause that overcurrent damages or the electric current normal glow current that can not reach LED less than normal makes the light efficiency step-down, the second is the Switching Power Supply constant current, constant current effect relative ideal, but its circuit structure is complicated, components and parts are many, easily damage, fraction defective is higher in the production, and cost is relatively high.
The utility model content
The utility model proposes a kind of constant-current power supply circuit, solved the prior art complex structure, components and parts are many, the problem of constant current weak effect.
The technical solution of the utility model is achieved in that
The utility model discloses a kind of constant-current power supply circuit, comprise the capacitance-resistance voltage reduction circuit that is formed by the first resistance and the first Capacitance parallel connection, the current rectifying and wave filtering circuit that links to each other with described capacitance-resistance voltage reduction circuit, also comprise the constant-current circuit that links to each other with described current rectifying and wave filtering circuit, described constant-current circuit comprises: the second resistance, the 3rd resistance, voltage-stabiliser tube and triode, the second resistance is connected in the common junction of described current rectifying and wave filtering circuit positive pole and load one end, the other end is connected in the common junction of the base circuit of described voltage-stabiliser tube negative electrode and described triode, the collector electrode of described triode links to each other with the load other end, the 3rd resistance one end is connected in the common junction of emitter with the circuit that links to each other of the reference utmost point of described voltage-stabiliser tube of described triode, the other end be connected to described current rectifying and wave filtering circuit negative pole after the anode of described voltage-stabiliser tube links to each other.
Described capacitance-resistance voltage reduction circuit input voltage and load voltage near the time, can be without resistance-capacitance depressurization, and direct rectifying and wave-filtering.
In constant-current power supply circuit described in the utility model, described current rectifying and wave filtering circuit comprises the first diode, the second diode, the 3rd diode, the 4th diode and the second electric capacity, wherein,
The positive pole of the first diode links to each other with the output of described capacitance-resistance voltage reduction circuit, and its negative pole is connected in the negative pole of the 3rd diode;
The negative pole of the second diode is connected in the common junction of described capacitance-resistance voltage reduction circuit and described the first diode, and its positive pole is connected in the positive pole of the 4th triode;
The 3rd diode cathode links to each other with the negative pole of the 4th diode;
The 3rd diode cathode is connected the input of additional power source with the common junction of the circuit of the negative pole composition of the 4th diode;
The second electric capacity one end is connected in the common junction of negative pole and the described constant-current circuit of the first diode, and the other end is connected in the common junction of the 4th diode cathode and described constant-current circuit.
In constant-current power supply circuit described in the utility model, the reference voltage of described voltage-stabiliser tube is 2.5V.
Reference voltage is different according to the reference voltage of the voltage-stabiliser tube different model of using, and this routine reference voltage is 2.5V.
In constant-current power supply circuit described in the utility model, described load is the LED lamp.
In constant-current power supply circuit described in the utility model, described additional power source input can be alternating current, also can be direct current.
Implement a kind of constant-current power supply circuit of the present utility model, have following useful technique effect:
The utility model constant-current power supply circuit, it adopts resistance-capacitance depressurization constant current framework, its circuit structure is simple, and components and parts are few, be not easy to damage and cost low, constant current accuracy is high, electric current can be changed according to loading demand, and it is convenient to use, and produces fraction defective relatively very low, be fit to the circuit supply to LED illuminalive power-supply or other needs constant current, efficiently solve the shortcoming that foregoing circuit exists.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of a kind of constant-current power supply circuit of the utility model.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, 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.
See also Fig. 1, embodiment of the present utility model, a kind of constant-current power supply circuit comprises: the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the first capacitor C 1, the second capacitor C 2, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, triode Q1, voltage-stabiliser tube U1.
The first resistance R 1 and the first capacitor C 1 compose in parallel capacitance-resistance voltage reduction circuit;
Capacitance-resistance voltage reduction circuit is connected in current rectifying and wave filtering circuit, and current rectifying and wave filtering circuit comprises the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 and the second capacitor C 2, wherein,
The positive pole of the first diode D1 links to each other with the output of capacitance-resistance voltage reduction circuit, and its negative pole is connected in the negative pole of the 3rd diode D3;
The negative pole of the second diode D2 is connected in the common junction of capacitance-resistance voltage reduction circuit and the first diode D2, and its positive pole is connected in the positive pole of the 4th diode D4;
The 3rd diode D3 positive pole links to each other with the negative pole of the 4th diode D4;
The 3rd diode D3 positive pole is connected the input of additional power source with the common junction of the circuit of the negative pole composition of the 4th diode D4;
The second capacitor C 2 one ends are connected in the common junction of negative pole and the constant-current circuit of the first diode D1, and the other end is connected in the common junction of the 4th diode D4 positive pole and constant-current circuit.
Current rectifying and wave filtering circuit is connected in constant-current circuit, and constant-current circuit comprises: the second resistance R 2, the 3rd resistance R 3, voltage-stabiliser tube U1 and triode Q1;
The second resistance R 2 is connected in the common junction of current rectifying and wave filtering circuit positive pole and load one end, the other end is connected in the common junction of the base circuit of voltage-stabiliser tube U1 negative electrode and triode Q1, the collector electrode of triode Q1 links to each other with the load other end, the 3rd resistance R 3 one ends are connected in the common junction of emitter with the circuit that links to each other of the reference utmost point of voltage-stabiliser tube U1 of triode Q1, the other end be connected to the current rectifying and wave filtering circuit negative pole after the anode of voltage-stabiliser tube U1 links to each other.
The reference voltage of voltage-stabiliser tube U1 is different according to the reference voltage of the voltage-stabiliser tube different model of using, and this routine reference voltage is 2.5V.
Load is the LED lamp.
The course of work of this circuit is:
Input voltage obtains the required direct voltage of load RL by resistance-capacitance depressurization behind the rectifying and wave-filtering, keep the upper current constant of load RL by constant-current circuit again, thereby reaches the effect of constant current
According to electrical principles:
The Q1 triode has I
C=β I
b, I
e≈ I
bCharacteristic wherein β is the triode multiplication factor;
Voltage-stabiliser tube U1 model is: TL431, integrated voltage-stabilized IC, its principle of stabilized voltage be, benchmark sampling Vref=2.5V, and when voltage is higher than Vref, U1 output current I
ZIncrease its output current I when Vr voltage is lower than Vref
ZReduce, thereby reach pressure stabilization function.
According to above electrical principles, the utility model circuit design be used for the circuit of constant current-supplying, its operation principle is as follows:
When input voltage increases, V+ increase → V
bIncrease → I
bIncrease → I
CIncrease → RL electric current increase → I
eIncrease → Vr increase → I
ZIncrease → V
bDecline → I
bDecline → I
CDecline → RL electric current descends, and reaches the effect of stabling current;
When input voltage descends, V+ decline → V
bDecline → I
bDecline → I
CDecline → RL electric current decline → I
eDecline → Vr decline → I
ZDecline → V
bIncrease → I
bIncrease → I
CIncrease → RL electric current increases, and reaches the effect of stabling current.
Implement a kind of constant-current power supply circuit of the present utility model, have following useful technique effect:
The utility model constant-current power supply circuit, it adopts resistance-capacitance depressurization constant current framework, its circuit structure is simple, and components and parts are few, be not easy to damage and cost low, constant current accuracy is high, electric current can be changed according to loading demand, and it is convenient to use, and produces fraction defective relatively very low, be fit to the circuit supply to LED illuminalive power-supply or other needs constant current, efficiently solve the shortcoming that foregoing circuit exists.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (5)
1. constant-current power supply circuit, comprise the capacitance-resistance voltage reduction circuit that is formed by the first resistance and the first Capacitance parallel connection, the current rectifying and wave filtering circuit that links to each other with described capacitance-resistance voltage reduction circuit, it is characterized in that, also comprise the constant-current circuit that links to each other with described current rectifying and wave filtering circuit, described constant-current circuit comprises: the second resistance, the 3rd resistance, voltage-stabiliser tube and triode, the second resistance is connected in the common junction of described current rectifying and wave filtering circuit positive pole and load one end, the other end is connected in the common junction of the base circuit of described voltage-stabiliser tube negative electrode and described triode, the collector electrode of described triode links to each other with the load other end, the 3rd resistance one end is connected in the common junction of emitter with the circuit that links to each other of the reference utmost point of described voltage-stabiliser tube of described triode, the other end be connected to described current rectifying and wave filtering circuit negative pole after the anode of described voltage-stabiliser tube links to each other.
2. constant-current power supply circuit according to claim 1 is characterized in that, described current rectifying and wave filtering circuit comprises the first diode, the second diode, the 3rd diode, the 4th diode and the second electric capacity, wherein,
The additional power source input accesses described resistance-capacitance depressurization input;
The positive pole of the first diode links to each other with the output of described capacitance-resistance voltage reduction circuit, and its negative pole is connected in the negative pole of the 3rd diode;
The negative pole of the second diode is connected in the common junction of described capacitance-resistance voltage reduction circuit and described the first diode, and its positive pole is connected in the positive pole of the 4th diode;
The 3rd diode cathode links to each other with the negative pole of the 4th diode;
The 3rd diode cathode is connected the input of additional power source with the common junction of the circuit of the negative pole composition of the 4th diode;
The second electric capacity one end is connected in the common junction of negative pole and the described constant-current circuit of the first diode, and the other end is connected in the common junction of the 4th diode cathode and described constant-current circuit.
3. constant-current power supply circuit according to claim 1 is characterized in that, the reference voltage of described voltage-stabiliser tube is 2.5V.
4. constant-current power supply circuit according to claim 1 is characterized in that, described load is the LED lamp.
5. constant-current power supply circuit according to claim 2 is characterized in that, described additional power source input can be alternating current, also can be direct current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220375923 CN202841601U (en) | 2012-07-31 | 2012-07-31 | Constant-current power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220375923 CN202841601U (en) | 2012-07-31 | 2012-07-31 | Constant-current power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202841601U true CN202841601U (en) | 2013-03-27 |
Family
ID=47953186
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220375923 Expired - Fee Related CN202841601U (en) | 2012-07-31 | 2012-07-31 | Constant-current power supply circuit |
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| CN (1) | CN202841601U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103002643A (en) * | 2012-11-27 | 2013-03-27 | 杭州科凡照明电器有限公司 | Constant-current drive circuit used for LED (Light Emitting Diode) lamp |
| CN103687210A (en) * | 2013-11-29 | 2014-03-26 | 孙爱玲 | LED buck-type control circuit |
| CN107154744A (en) * | 2017-07-20 | 2017-09-12 | 西安邮电大学 | A kind of constant-current power supply circuit |
-
2012
- 2012-07-31 CN CN 201220375923 patent/CN202841601U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103002643A (en) * | 2012-11-27 | 2013-03-27 | 杭州科凡照明电器有限公司 | Constant-current drive circuit used for LED (Light Emitting Diode) lamp |
| CN103687210A (en) * | 2013-11-29 | 2014-03-26 | 孙爱玲 | LED buck-type control circuit |
| CN107154744A (en) * | 2017-07-20 | 2017-09-12 | 西安邮电大学 | A kind of constant-current power supply circuit |
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Legal Events
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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 |
Granted publication date: 20130327 Termination date: 20150731 |
|
| EXPY | Termination of patent right or utility model |