CN207218539U - A kind of double tube positive exciting formula constant-current supply - Google Patents
A kind of double tube positive exciting formula constant-current supply Download PDFInfo
- Publication number
- CN207218539U CN207218539U CN201721032787.5U CN201721032787U CN207218539U CN 207218539 U CN207218539 U CN 207218539U CN 201721032787 U CN201721032787 U CN 201721032787U CN 207218539 U CN207218539 U CN 207218539U
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- China
- Prior art keywords
- transformer
- switching tube
- current supply
- formula constant
- positive exciting
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Abstract
The utility model discloses a kind of double tube positive exciting formula constant-current supply, belong to applied power electronics technical field.The double tube positive exciting formula constant-current supply includes main power circuit and control circuit, and the main power circuit includes EMI filter rectifications, electric capacity CIN, transformer T1, switching tube VT1, switching tube VT2, clamp diode D1, clamp diode D2, commutation diode D3, commutation diode D4, output inductor L, output capacitance COUT, transformer T2, sampling resistor R, LED load.Double tube positive exciting formula constant-current supply of the present utility model has the advantages of voltage stress is low, driving force is strong, reliability is high, and suitable for the LED drive power application scenario that power is larger, job stability is high, and system sustainability can be high, and service life is longer.
Description
Technical field
The utility model belongs to applied power electronics technical field, and in particular to a kind of double tube positive exciting formula constant-current supply, fits
For Switching Power Supply especially LED drive power application field.
Background technology
Switching Power Supply is the essential power electronic equipment of modern society's life, its electronics, communication, electrically, the energy,
The fields such as illumination, Aero-Space, military affairs and household electrical appliances suffer from very extensive application.It is further with Power Electronic Technique
Development, requirement of the society to the volume of Switching Power Supply, reliability, cost, energy-conserving and environment-protective etc. further improve.LED drives
Important document of the power supply as LED illumination lamp, security, stability, the reliability of its product are produced to end product function and life-span
Raw significant impact.
At present, Switching Power Supply typically using normal shock, flyback, recommend, the topological structure, wherein forward topology such as half-bridge, full-bridge
Structure because voltage and current good output, load capacity are strong, anti-bridge arm direct pass, the features such as reliability is high and widely should
For in the Switching Power Supply of relatively high power.But the switching voltage stress of forward converter is high, is twice of input voltage, sometimes even
More than twice input voltage, too high switching voltage stress turn into limitation forward converter capacity continue increased one it is crucial because
Element.Most of Switching Power Supply is controlled using PWM at present simultaneously, and dutycycle is adjusted under conditions of frequency is certain and carrys out controlling switch pipe
Break-make, but PWM generally existing constant current problem, causes work because the influence of error amplifier, loop gain are restricted
It is unstable.
Utility model content
Have that voltage stress is big, current ripples are big, power source life is short in actual use to solve existing Switching Power Supply
The problem of, the utility model provides a kind of double tube positive exciting formula constant-current supply, with voltage stress is low, driving force is strong, reliable
The advantages of property height, working stability, longer service life.
To reach above-mentioned purpose, the utility model uses following technical scheme：
A kind of double tube positive exciting formula constant-current supply, including main power circuit and control circuit；The main power circuit includes double
Pipe forward converter and isolated drive circuit, the control circuit include current feedback circuit, pulse-generating circuit, accessory power supply electricity
Road；The main power circuit includes EMI filter rectifications, electric capacity CIN, transformer T1, switching tube VT1, switching tube VT2, the pole of clamper two
Pipe D1, clamp diode D2, commutation diode D3, commutation diode D4, output inductor L, output capacitance COUT, transformer
T2, sampling resistor R, LED load；
EMI filter rectifications, the positive pole connection electric capacity C of output are passed through in mains inputINOne end, switching tube VT1Leakage
Pole, clamp diode D1 negative electrode, clamp diode D1 anode and the different name end of transformer T1 armature windings, switching tube VT2
Drain electrode be connected, switching tube VT1Source electrode be connected with the Same Name of Ends of transformer T1 armature windings, clamp diode D2 negative electrode,
Switching tube VT1Grid is connected with the Same Name of Ends of the transformer T2 winding of secondary first, switching tube VT2Grid and transformer T2
The Same Name of Ends of secondary second winding is connected, and the different name end of the transformer T2 winding of secondary first is same with transformer T1 armature windings
Name end is connected, negative pole, the electric capacity C of the output of EMI filter rectificationsINThe other end, switching tube VT2Source electrode, clamp diode D2
Anode, transformer T2 the winding of secondary second different name end ground connection；
The Same Name of Ends of transformer T1 secondary windings is connected with commutation diode D3 anode, transformer T1 secondary windings it is different
Name end is connected with commutation diode D4 anode, sampling resistor R one end, commutation diode D3 negative electrode, commutation diode
D4 negative electrode is connected with output inductor L one end, output inductor the L other end, output capacitance COUTOne end, LED
One end of load is connected, output capacitance COUTThe other end be connected with the sampling resistor R other end, the other end of LED load.
Preferably, the transformer T2 is pulse transformer.
Preferably, the input signal of the armature winding of the transformer T2 produces offer by TC4424 chips.
Preferably, the switching tube VT1, switching tube VT2From IRFP460 as switching tube.
Preferably, the pulse-generating circuit uses PWM control methods.
Preferably, the pulse-generating circuit uses TL494 chips as controller.
Preferably, the TL494 chips use 15V power supply voltage supply.
Preferably, the sampling resistor R forms current feedback circuit by LM358 amplifiers.
The beneficial effect that the utility model is compared with the prior art includes：
(1) the utility model uses double tube positive exciting and isolation drive mode, reduces the voltage stress of switching tube, realizes and drives
Dynamic isolation, the reliability of work is improved, extend the service life of Switching Power Supply；
(2) the utility model pulse control circuit uses PWM control methods, suitable for the occasion that power output is larger,
Controller of the TL494 chips as pulse-generating circuit, its error-sensitivity is high, and an internal error amplifier is as output electricity
Throttle regulator, another realizes current-limiting protection and over-pressed detection function, prevents load from opening as output overvoltage detection comparator
System crash during road；
(3) the utility model enhances the driving of drive circuit using isolated drive circuit is formed based on TC4424 chips
Ability；
(4) the utility model has the characteristic of high withstand voltage, ensure that switching tube is larger from IRFP460 as switching tube
Margin of power.
Brief description of the drawings
Fig. 1 is circuit structure schematic diagram of the present utility model；
Fig. 2 is main power circuit figure of the present utility model.
Embodiment
Below against accompanying drawing and with reference to preferred embodiment, the utility model is described in further detail.
Circuit structure schematic diagram obtains DC voltage as double tube positive exciting electricity as shown in figure 1, after the rectified filtering of civil power
Road and the input voltage of auxiliary power circuit.After current feedback circuit amplification and impedance conversion that sampling resistor is formed through LM358,
Suitable current feedback signal is obtained, delivers to the pulse-generating circuit that TL494 chips are controller, TL494 chips need 15V's
Accessory power supply is powered to it, and TL494 chips carry out PWM control and regulation to current feedback signal, current feedback signal stabilization is existed
Desired value.The isolated drive circuit that the pwm signal of TL494 chips output forms through TC4424 chips and pulse transformer T2 is real
Existing isolation drive, obtains input signal of the two-way pwm signal respectively as double tube positive exciting circuit, when IRFP460 switch conductions,
Through transformer T1 normal shocks energy is provided to LED load.
Wherein, the current feedback circuit, pulse-generating circuit, auxiliary power circuit composition control circuit, isolation drive
Circuit, double tube positive exciting circuit composition main power circuit, control circuit, main power circuit collectively constitute double tube positive exciting formula Constant Electric Current
Source.
Fig. 2 is main power circuit figure of the present utility model.EMI filter rectifications, the positive pole of output are passed through in mains input
Connect electric capacity CINOne end, switching tube VT1Drain electrode, clamp diode D1 negative electrode, clamp diode D1 anode and transformation
The different name end of device T1 armature windings, switching tube VT2Drain electrode be connected, switching tube VT1Source electrode and transformer T1 armature windings it is same
Name end, clamp diode D2 negative electrode are connected, switching tube VT1The Same Name of Ends phase of grid and the transformer T2 winding of secondary first
Even, switching tube VT2Grid be connected with the Same Name of Ends of the transformer T2 winding of secondary second, the transformer T2 winding of secondary first
Different name end be connected with the Same Name of Ends of transformer T1 armature windings, EMI filter rectifications output negative pole, electric capacity CINThe other end,
Switching tube VT2Source electrode, clamp diode D2 anode, transformer T2 the winding of secondary second different name end ground connection；Transformer
The Same Name of Ends of T1 secondary windings is connected with commutation diode D3 anode, different name end and the pole of rectification two of transformer T1 secondary windings
Pipe D4 anode, sampling resistor R one end are connected, commutation diode D3 negative electrode, commutation diode D4 negative electrode and output
Filter inductance L one end is connected, output inductor the L other end, output capacitance COUTOne end, one end phase of LED load
Even, output capacitance COUTThe other end be connected with the sampling resistor R other end, the other end of LED load.
Wherein, the transformer T2 is pulse transformer；
The input signal of the armature winding of the transformer T2 produces offer by TC4424 chips；
The switching tube VT1, switching tube VT2From IRFP460 as switching tube；
The sampling resistor R forms current feedback circuit by LM358 amplifiers.
Above content is to combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that specific implementation of the present utility model is confined to these explanations.For the utility model person of ordinary skill in the field
For, without departing from the concept of the premise utility, some equivalent substitutes or obvious modification, and performance can also be made
Or purposes is identical, the scope of protection of the utility model should be all considered as belonging to.
Claims (8)
1. a kind of double tube positive exciting formula constant-current supply, including main power circuit and control circuit；The main power circuit includes two-tube
Forward converter and isolated drive circuit, the control circuit include current feedback circuit, pulse-generating circuit, accessory power supply electricity
Road；It is characterized in that：The main power circuit includes EMI filter rectifications, electric capacity CIN, transformer T1, switching tube VT1, switching tube
VT2, clamp diode D1, clamp diode D2, commutation diode D3, commutation diode D4, output inductor L, output electricity
Hold COUT, transformer T2, sampling resistor R, LED load；
EMI filter rectifications, the positive pole connection electric capacity C of output are passed through in mains inputINOne end, switching tube VT1Drain electrode, pincers
Position diode D1 negative electrode, clamp diode D1 anode and the different name end of transformer T1 armature windings, switching tube VT2Drain electrode
It is connected, switching tube VT1Source electrode be connected with the Same Name of Ends of transformer T1 armature windings, clamp diode D2 negative electrode, switching tube
VT1Grid is connected with the Same Name of Ends of the transformer T2 winding of secondary first, switching tube VT2Grid and transformer T2 secondary the
The Same Name of Ends of two windings is connected, the different name end of the transformer T2 winding of secondary first and the Same Name of Ends phase of transformer T1 armature windings
Even, negative pole, the electric capacity C of EMI filter rectifications outputINThe other end, switching tube VT2Source electrode, clamp diode D2 anode, become
The different name end ground connection of the depressor T2 winding of secondary second；
The Same Name of Ends of transformer T1 secondary windings is connected with commutation diode D3 anode, the different name end of transformer T1 secondary windings
Anode, sampling resistor R one end with commutation diode D4 are connected, commutation diode D3 negative electrode, commutation diode D4
Negative electrode is connected with output inductor L one end, output inductor the L other end, output capacitance COUTOne end, LED load
One end be connected, output capacitance COUTThe other end be connected with the sampling resistor R other end, the other end of LED load.
2. double tube positive exciting formula constant-current supply according to claim 1, it is characterised in that the transformer T2 is pulse transforming
Device.
3. double tube positive exciting formula constant-current supply according to claim 1, it is characterised in that the armature winding of the transformer T2
Input signal by TC4424 chips produce offer.
4. double tube positive exciting formula constant-current supply according to claim 1, it is characterised in that the switching tube VT1, switching tube VT2
From IRFP460 as switching tube.
5. double tube positive exciting formula constant-current supply according to claim 1, it is characterised in that the pulse-generating circuit uses
PWM control methods.
6. double tube positive exciting formula constant-current supply according to claim 5, it is characterised in that the pulse-generating circuit uses
TL494 chips are as controller.
7. double tube positive exciting formula constant-current supply according to claim 6, it is characterised in that the TL494 chips are using 15V's
Power supply voltage supply.
8. double tube positive exciting formula constant-current supply according to claim 1, it is characterised in that the sampling resistor R passes through LM358
Amplifier forms current feedback circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721032787.5U CN207218539U (en) | 2017-08-17 | 2017-08-17 | A kind of double tube positive exciting formula constant-current supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721032787.5U CN207218539U (en) | 2017-08-17 | 2017-08-17 | A kind of double tube positive exciting formula constant-current supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207218539U true CN207218539U (en) | 2018-04-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721032787.5U Expired - Fee Related CN207218539U (en) | 2017-08-17 | 2017-08-17 | A kind of double tube positive exciting formula constant-current supply |
Country Status (1)
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| CN (1) | CN207218539U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586561A (en) * | 2018-10-30 | 2019-04-05 | 上海沪工焊接集团股份有限公司 | A kind of two-tube driving circuit and its control method |
| CN112332675A (en) * | 2020-11-06 | 2021-02-05 | 吉林大学 | Wide-input-voltage and high-dynamic-response double-tube forward converter |
| CN112332670A (en) * | 2020-11-09 | 2021-02-05 | 江门市科通半导体有限公司 | Multiunit multivoltage output flyback converter control circuit |
| WO2022022217A1 (en) * | 2020-07-30 | 2022-02-03 | 华为数字能源技术有限公司 | Double-transistor flyback transformation circuit, power supply module, electric vehicle, and control method |
-
2017
- 2017-08-17 CN CN201721032787.5U patent/CN207218539U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586561A (en) * | 2018-10-30 | 2019-04-05 | 上海沪工焊接集团股份有限公司 | A kind of two-tube driving circuit and its control method |
| WO2022022217A1 (en) * | 2020-07-30 | 2022-02-03 | 华为数字能源技术有限公司 | Double-transistor flyback transformation circuit, power supply module, electric vehicle, and control method |
| CN112332675A (en) * | 2020-11-06 | 2021-02-05 | 吉林大学 | Wide-input-voltage and high-dynamic-response double-tube forward converter |
| CN112332675B (en) * | 2020-11-06 | 2021-08-27 | 吉林大学 | Wide-input-voltage and high-dynamic-response double-tube forward converter |
| CN112332670A (en) * | 2020-11-09 | 2021-02-05 | 江门市科通半导体有限公司 | Multiunit multivoltage output flyback converter control circuit |
| CN112332670B (en) * | 2020-11-09 | 2023-07-25 | 江门市科通半导体有限公司 | Multi-group multi-voltage output flyback converter control circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180410 Termination date: 20180817 |
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| CF01 | Termination of patent right due to non-payment of annual fee |