CN207692089U - Power circuit and its lighting apparatus - Google Patents
Power circuit and its lighting apparatus Download PDFInfo
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- CN207692089U CN207692089U CN201721523742.8U CN201721523742U CN207692089U CN 207692089 U CN207692089 U CN 207692089U CN 201721523742 U CN201721523742 U CN 201721523742U CN 207692089 U CN207692089 U CN 207692089U
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Abstract
The utility model discloses a kind of power circuit and its lighting apparatus, including：Transformer T1, switching tube Q1, diode D2 and feedback circuit；The switching tube Q1 is electrically connected the primary coil of the transformer T1 to control the electric current of the primary coil, and the base stage of switching tube Q1 is then electrically connected to power input；The feedback circuit is connected in series between the switching tube Q1 base stages and the transformer T1 secondary coil output ends；The diode D2 is connected in series between the transformer T1 secondary coils and load end OUT, wherein the anode of the diode D2 is connected to the load end OUT.The circuit of the performance characteristics of electronic component and ingehious design is utilized in this circuit, its is simple in structure cheap, and self-oscillation control circuit is not necessarily to auxiliary power supply, and circuit reduction and its optimization design are also brought at low cost, the small effect of volume weight, is easy to control output voltage.
Description
Technical field
The utility model is related to power circuit fields.
Background technology
It is non-that to determine frequency power RCC (Ringing Choke converter) be a kind of self-excitation constituted using blocking oscillator
Oscillating impulse converter is common in inexpensive small-power switching power-supply.Currently, the overvoltage protection in RCC circuits is using rear class electricity
The mode of road Voltage Feedback carries out, late-class circuit by opto-coupled feedback voltage signal to input circuit, and in input circuit and light
Switching tube is provided between coupling.The break-make of switching tube need to correspond to corresponding voltage value, when the voltage value of feedback is low pressure, switch
Pipe is off, and overvoltage crowbar is not turned on；When the voltage value of feedback is high pressure, switching tube is in closed state,
Overvoltage crowbar is connected；Pass through the break-make of the on-off control circuit overvoltage protection of switching tube.
RCC circuits are gradually applied to field of LED illumination, are used as the driving circuit of LED illumination, however in the prior art
PWM controls are formed by IC completions switch tube mostly in RCC switching power circuits or existing circuit is excessively complicated, in this way
The RCC Switching Power Supply costs of formation are higher.
Utility model content
The utility model is at least one defect (deficiency) overcome described in the above-mentioned prior art, provides one kind.
In order to solve the above technical problems, the technical solution of the utility model is as follows：A kind of power circuit, including：Transformer
T1, switching tube Q1, diode D2 and feedback circuit；
The switching tube Q1 is electrically connected the primary coil of the transformer T1 to control the electric current of the primary coil, the switch
The base stage of pipe Q1 is then electrically connected to power input；
The feedback circuit be connected in series in the switching tube Q1 base stages and the transformer T1 secondary coils output end it
Between；
The diode D2 is connected in series between the transformer T1 secondary coils and load end OUT-, wherein described
The anode of diode D2 is connected to the load end OUT-.
In some embodiments, the feedback circuit include capacitance C2 and its with the concatenated resistance R2 of the capacitance C2.
When external dc electricity is by input terminal AC IN inputs, the base stage of current direction switching tube Q1, at this point, triode Q1
Pico- conducting, it is similarly (secondary in transformer T1 to the just lower negative induced voltage in the generation of transformer T1 (primary coil) winding
Grade coil) winding generate on just descend negative voltage；In turn, voltage is through feedback circuit (feedback circuit of capacitance C2, resistance R2 composition),
Switching tube Q1 positive feedbacks are given, to make the base current of switching tube Q1 increase, to keep its fully on, until saturation；It opens
Flowing through T1 transformers (primary coil) winding current after the pipe Q1 saturations of pass will not change again, i.e. inductance (transformer T1 primary coils)
Electric current stops variation, and according to the property of inductance it is found that transformer T1 primary coils generate counter electromotive force, transformer T1 is (former at this time
Sideline is enclosed) winding obtains negative lower positive voltage, to which transformer T1 (secondary coil) obtains negative lower positive voltage, the voltage one
Aspect is given by back biased diode D2 and is connected to the ends OUT- load supplying, while as the counter electromotive force gives external loading to power,
The loss of energy, voltage decline, and when the back-emf voltage is less than diode DZ1 conducting voltages, diode DZ1 is closed,
To stop powering load, switching tube Q1 is restored to original lightly conducting state by original saturation state, to make it lead again
It is logical, such cycle operation, and power to external loading；The working condition of triode Q1 changes：Lightly conducting-saturation-cut-off.
Performance characteristics (inductance characteristic of voltage device, the conducting voltage pole of diode of electronic component is utilized in this circuit
The switching characteristic and its saturated characteristic of limit and switching tube) and the circuit of ingehious design, it is simple in structure cheap, from exciting
Swing control circuit without auxiliary power supply (only need feedback circuit, without PWM control), circuit reduction and its optimization design also band
Next at low cost, the small effect of volume weight is easy to control output voltage.
In some embodiments, the power circuit further includes resistance R3, and the resistance R3 is connected to the switching tube
The emitter of Q1.Heavy current impact from when resistance R3 can protect switching tube Q1 to open prevents high current switch tube Q1 from impacting
Damage.
In some embodiments, the power circuit further includes current-limiting resistance R1, and the current-limiting resistance R1 is connected to institute
State the base stage of switching tube Q1.Current-limiting resistance R1 can play the role of stabling current, prevent heavy current impact switching tube Q1.
In some embodiments, the power circuit further includes electric current anti-bias circuit, the electric current anti-bias circuit connection
In the switching tube Q1 base stages.
In some embodiments, the electric current anti-bias circuit includes zener diode DZ1, the zener diode DZ1
Anode is connected to the anode of the diode D2, and zener diode DZ1 cathodes are connected to the base stage of the switching tube Q1.
While transformer T1 counter electromotive force occurs and powers to external loading, the electric current of switching tube Q1 base stages is by the electric current
Anti-bias circuit shunts, and so that the base current of switching tube Q1 is reduced, switching tube Q1 is made to end rapidly, increases switching tube Q1 cut-offs
Mobility and reliability.Using zener diode DZ1 as anti-bias circuit device, on the one hand, zener diode DZ1's is reversed
Conducting voltage is smaller, it is ensured that the sensitivity of the electric current anti-bias circuit, on the other hand, zener diode DZ1 plays stable output
The effect of voltage, under stable state, zener diode DZ1 voltages are directly proportional to load output voltage, therefore zener diode DZ1's is steady
Pressure determines the size of output voltage, in addition, changing zener diode D2 voltage stabilizing values can be adjusted output voltage.
In some embodiments, the power circuit further includes capacitance C3, and the capacitance C3 is connected to the diode
The anode of D2.
Transformer T1 (secondary coil) winding voltage sizes are determined by winding turns ratio, during switching tube Q1 saturations, transformation
While device T1 (secondary coil) windings by conducting diode D2 are load supplying, capacitance C3 charging is also given, capacitance C3's
Voltage just descends negative voltage to be upper, and the voltage of capacitance C3 can give diode D2 to provide reversed bias voltage, the i.e. sun to diode D2
Pole provides forward voltage, in favor of the conducting to diode D2, to be conducive to circuit powering load.
On the other hand, capacitance C3 can give voltage-stabiliser tube DZ1 to provide voltage, when capacitance C3 chargings make capacitance C3 voltages reach steady
When pressure pipe DZ1 conducting voltages, switching tube Q1 base currents lose forward current because voltage-stabiliser tube DZ1 is connected, to make switching tube
Q1 enters cut-off state, reaches control purpose；In addition, capacitance C3 can also form rectifying and wave-filtering electricity along with diode D2
Road.
In some embodiments, the power circuit further includes rectification circuit, the output end connection of the rectification circuit
In the input terminal of the transformer T1, the output end of the rectification circuit is connected to the base stage of the switching tube Q1.It can be direct
Alternating current (alternating current) is inputted, when external mains electricity input end ACIN input ac voltages are through diode D1 rectifications, capacitance C1 filtering obtains
To DC voltage, into the power circuit to powering load.
In some embodiments, the switching tube Q1 is that NPN ties triode or positive-negative-positive triode.
The utility model additionally provides a kind of lighting apparatus, which includes one or more loads, and more than
Any one of them power circuit, it is one or more of to load the load end OUT- and OUT for being electrically connected to the power circuit
+, it is recognised that the above power circuit is used for lighting apparatus, cost can be reduced, the reliability of circuit is improved.
Description of the drawings
Fig. 1 is the power circuit schematic diagram of one embodiment of the utility model.
Specific implementation mode
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；It is attached in order to more preferably illustrate the present embodiment
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.
As shown in Figure 1, the power circuit of the present embodiment, including：Rectification circuit 10, transformer T1, switching tube Q1, diode
D2, feedback circuit 20 and electric current anti-bias circuit 40；
Rectification circuit 10 is connected to the base stage power supply of transformer T1 and its switching tube Q1, switching tube Q1 electrical connection transformers T1
Primary coil to control the electric current of the primary coil.
Feedback circuit 20 is connected in series between switching tube Q1 base stages and transformer T1 secondary coil output ends；Diode D2
It is connected in series between transformer T1 secondary coils and load end OUT-, wherein the anode of diode D2 is connected to the load
Hold OUT-；Electric current anti-bias circuit 40 is connected to switching tube Q1 base stages, and specifically, electric current anti-bias circuit 40 includes zener diode
DZ1, zener diode DZ1 anodes are connected to the anode of the diode D2, and zener diode DZ1 cathodes are connected to switching tube Q1
Base stage.
When use, alternating current inputs the ends AC IN, the diode D1 rectifications of alternating current pressuring meridian rectification circuit 10, capacitance C1
Filtering；Then direct current is obtained；Electric current flows to the base stage of switching tube Q1 by resistance R1, and switching tube Q1 is connected slightly, in transformation
Device T1 (primary coil) winding generates just lower negative induced voltage, while in the generation of transformer T1 (secondary coil) winding just
Lower negative voltage, which gives switching transistor Q1 positive feedbacks, keeps Q1 fully on by capacitance C2, resistance R2, until saturation；
Flowing through T1 transformers (primary coil) winding current after switching tube Q1 saturations will not change again, i.e. inductance (transformer T1 primary side lines
Circle) electric current stops variation, according to the property of inductance it is found that transformer T1 primary coils generate counter electromotive force, at this time transformer T1
(primary coil) winding obtains negative lower positive voltage, to which transformer T1 (secondary coil) obtains negative lower positive voltage, the voltage
On the one hand by back biased diode D2 to the ends OUT- load supplying is connected to, on the other hand, while as the counter electromotive force is to outer
Section load is powered, the loss of energy, and voltage declines, when the back-emf voltage is less than diode DZ1 conducting voltages, two poles
Pipe DZ1 is closed, and to stop powering load, switching tube Q1 is restored to original lightly conducting state by original saturation state, to
It is set to be connected again, such cycle operation, and power to external loading；The working condition of triode Q1 changes：Lightly conducting-is full
With-cut-off.
And while transformer T1 counter electromotive force occurs and powers to external loading, the electric current of switching tube Q1 base stages is by the electricity
It flows anti-bias circuit 30 to shunt, so that the base current of switching tube Q1 is reduced, switching tube Q1 is made to end rapidly, increase switching tube Q1 and cut
Mobility only and reliability.Using zener diode DZ1 as anti-bias circuit device, on the one hand, zener diode DZ1's
Reverse turn-on voltages are smaller, it is ensured that the sensitivity of the electric current anti-bias circuit, on the other hand, zener diode DZ1 plays stabilization
The effect of output voltage, under stable state, zener diode DZ1 voltages are directly proportional to load output voltage, therefore zener diode DZ1
Voltage stabilizing determine output voltage size, in addition, change zener diode D2 voltage stabilizing values can be adjusted output voltage.
Wherein, include but not limited to following scheme for feedback circuit 20：It is concatenated by capacitance C2 and its with capacitance C2
Resistance R2, or simple resistance R2, when using capacitance C2, the selection according to capacitance C2 parameters can change open
Close saturation and the deadline of pipe Q1.
Wherein, switching tube Q1 can be that NPN ties triode or positive-negative-positive triode；As the peripheral circuit of switching tube Q1,
The power circuit of the utility model further includes resistance R3 and current-limiting resistance R1, and resistance R3 is connected to the emitter of switching tube Q1, limit
Leakage resistance R1 is connected to the base stage of switching tube Q1.Wherein, resistance R3 and current-limiting resistance R1 plays the role of limiting electric current, prevents
Excessive rush of current switching tube Q1 is to damage switching tube Q1.
In one embodiment, the power circuit of the utility model can also include capacitance C3, and capacitance C3 is connected to two poles
The anode of pipe D2.Transformer T1 (secondary coil) winding voltage sizes are determined by winding turns ratio, during switching tube Q1 saturations, are become
While depressor T1 (secondary coil) windings by conducting diode D2 are load supplying, capacitance C3 charging, capacitance C3 are also given
Voltage be it is upper just descend negative voltage, the voltage of capacitance C3 can give diode D2 offer reversed bias voltages, i.e., to diode D2's
Anode provides forward voltage, in favor of the conducting to diode D2, to be conducive to circuit powering load.
On the other hand, capacitance C3 can give voltage-stabiliser tube DZ1 to provide voltage, when capacitance C3 chargings make capacitance C3 voltages reach steady
When pressure pipe DZ1 conducting voltages, switching tube Q1 base currents lose forward current because voltage-stabiliser tube DZ1 is connected, to make switching tube
Q1 enters cut-off state, reaches control purpose；In addition, capacitance C3 can also form rectifying and wave-filtering electricity along with diode D2
Road.
Performance characteristics (inductance characteristic of voltage device, the diode of electronic component is utilized in the circuit of the utility model
The switching characteristic and its saturated characteristic of the conducting voltage limit and switching tube) and the circuit of ingehious design, cost simple in structure
It is cheap, self-oscillation control circuit without auxiliary power supply (only need feedback circuit, without PWM control), circuit reduction and its
Optimization design is also brought at low cost, and the small effect of volume weight is easy to control output voltage.
Based on above advantage, the circuit of the utility model technology can be used for lighting apparatus, which further includes
One or more load, one or more load are electrically connected to the load end OUT- and OUT+ of power circuit, it is recognised that will be with
Upper power circuit is used for lighting apparatus, can reduce cost, improve the reliability of circuit.
In figure, description position relationship only for illustration, should not be understood as the limitation to this patent；Obviously, this reality
It is only intended to clearly illustrate the utility model example with novel above-described embodiment, and is not to the utility model
Embodiment restriction.For those of ordinary skill in the art, it can also make on the basis of the above description
Other various forms of variations or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all new in this practicality
All any modification, equivalent and improvement etc., should be included in the utility model right and want made by within the spirit and principle of type
Within the protection domain asked.
Claims (10)
1. power circuit, which is characterized in that including：Transformer T1, switching tube Q1, diode D2 and feedback circuit（20）；
The switching tube Q1 is electrically connected the primary coil of the transformer T1 to control the electric current of the primary coil, switching tube Q1
Base stage be then electrically connected to power input；
The feedback circuit（20）Be connected in series in the switching tube Q1 base stages and the transformer T1 secondary coils output end it
Between；
The diode D2 is connected in series between the transformer T1 secondary coils and load end OUT-, wherein two pole
The anode of pipe D2 is connected to the load end OUT-.
2. power circuit according to claim 1, which is characterized in that the feedback circuit（20）Including capacitance C2 and its with
The concatenated resistance R2 of capacitance C2.
3. power circuit according to claim 1, which is characterized in that the power circuit further includes resistance R3, the electricity
Resistance R3 is connected to the emitter of the switching tube Q1.
4. power circuit according to claim 1, which is characterized in that the power circuit further includes current-limiting resistance R1, institute
State the base stage that current-limiting resistance R1 is connected to the switching tube Q1.
5. power circuit according to claim 1, which is characterized in that the power circuit further includes electric current anti-bias circuit
（40）, the electric current anti-bias circuit（40）It is connected to the switching tube Q1 base stages.
6. power circuit according to claim 5, which is characterized in that the electric current anti-bias circuit（40）Including two pole of voltage stabilizing
Pipe DZ1, the zener diode DZ1 anodes are connected to the anode of the diode D2, and zener diode DZ1 cathodes are connected to institute
State the base stage of switching tube Q1.
7. power circuit according to claim 1, which is characterized in that the power circuit further includes capacitance C3, the electricity
Hold the anode that C3 is connected to the diode D2.
8. the power circuit according to any one of claim 1 ~ 7, which is characterized in that the power circuit further includes rectification
Circuit（10）, the rectification circuit（10）Output end be connected to the input terminal of the transformer T1, the rectification circuit（10）
Output end be connected to the base stage of the switching tube Q1.
9. the power circuit according to any one of claim 1 ~ 7, which is characterized in that the switching tube Q1 is NPN knots three
Pole pipe or positive-negative-positive triode.
10. lighting apparatus, which is characterized in that loaded including one or more and any one of claims 1 to 9
Power circuit, it is one or more of to load the load end OUT- and OUT+ for being electrically connected to the power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721523742.8U CN207692089U (en) | 2017-11-15 | 2017-11-15 | Power circuit and its lighting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721523742.8U CN207692089U (en) | 2017-11-15 | 2017-11-15 | Power circuit and its lighting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207692089U true CN207692089U (en) | 2018-08-03 |
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ID=62989549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721523742.8U Active CN207692089U (en) | 2017-11-15 | 2017-11-15 | Power circuit and its lighting apparatus |
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| CN (1) | CN207692089U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109788603A (en) * | 2017-11-15 | 2019-05-21 | 广东金莱特电器股份有限公司 | Power circuit and its lighting apparatus |
-
2017
- 2017-11-15 CN CN201721523742.8U patent/CN207692089U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109788603A (en) * | 2017-11-15 | 2019-05-21 | 广东金莱特电器股份有限公司 | Power circuit and its lighting apparatus |
| CN109788603B (en) * | 2017-11-15 | 2024-03-15 | 广东金莱特电器股份有限公司 | Power supply circuit and lighting equipment thereof |
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