CN208623576U - A kind of ten tunnels output transformer equalizing circuit - Google Patents

Abstract

The utility model discloses a kind of ten tunnels to export transformer equalizing circuit, including direct-flow input end, the direct-flow input end is connected with PWM controller, the PWM controller is connected with the primary side of transformer, the primary side of the transformer is also connected with metal-oxide-semiconductor, the metal-oxide-semiconductor is connect with the PWM controller, and the secondary side of the transformer has ten secondary windings, and described ten secondary windings are all connected with output end.The utility model has the beneficial effects that PWM controller uses the waveform of transformer primary edge-impulse as feedback quantity, without optocoupler or additional winding, PWM controller uses critical operating mode, under critical operating mode, during secondary current is equal to zero, the voltage value on secondary side can be obtained by primary side, there is no need to additional sample networks, and adjustment of load can be realized.

Description

A kind of ten tunnels output transformer equalizing circuit

Technical field

The utility model relates to equalizing circuit technical fields, it particularly relates to a kind of balanced electricity of ten tunnels output transformer Road.

Background technique

Transformer is easy to produce when multiple-channel output combines flows unbalanced problem, if each road cell voltage is unequal When, and the equal turn numbers of each winding in secondary side, it is excessive to will result in the road voltage Di Na load current, so that each road electric current produces Life is unbalanced.Increase the disadvantage that the method for multi-stage cascade can overcome this intrinsic although taking and reducing output number.But in reality The equal flow problem of multiple-channel output is often solved in work using the Cascading Methods of multiple PWM controllers.

PWM controller is a current-mode, for the switching regulaor of single-ended reverse exciting circuit.What circuit of reversed excitation encountered First hang-up is to need to use the mode of isolation by the control terminal of the voltage transmission on secondary side to primary side.Traditional isolation method is used up Coupling or additional winding.Optical coupler will increase cost, loss and the volume of system.Since optocoupler is non-linear and junction capacity is with timely Become the factors such as characteristic for the dynamic response for the system that limits, linear regulation and service life.Also have in the method using additional winding Drawbacks described above, while the volume, volume and cost of transformer are increased, and influence the speed of dynamic response.

For the problems in the relevant technologies, currently no effective solution has been proposed.

Utility model content

For above-mentioned technical problem in the related technology, the utility model proposes a kind of balanced electricity of ten tunnels output transformer Road can be used metal-oxide-semiconductor and realize isolation, is not necessarily to optocoupler or additional winding.

To realize the above-mentioned technical purpose, the technical solution of the utility model is achieved in that

A kind of ten tunnels output transformer equalizing circuit, including direct-flow input end, the direct-flow input end are connected with PWM control Device, the PWM controller are connected with the primary side of transformer, and the primary side of the transformer is also connected with metal-oxide-semiconductor, the metal-oxide-semiconductor with The PWM controller connection, the secondary side of the transformer have ten secondary windings, and described ten secondary windings are all connected with output End.

Further, the PWM controller is isolated form flyback controller.

Further, the model LT3748 of the PWM controller.

Further, the end RFB of the PWM controller connects the primary side of the transformer, the pole the G connection of the metal-oxide-semiconductor The end Gate of the PWM controller, the pole D of the metal-oxide-semiconductor connect the primary side of the transformer, and the pole S of the metal-oxide-semiconductor connects institute State the end Sense of PWM controller.

Further, the transformer is flat-plate transformer.

Further, the transformer uses ER23 FERRITE CORE.

The utility model has the beneficial effects that PWM controller uses the waveform of transformer primary edge-impulse as feedback quantity, it is not necessarily to Optocoupler or additional winding, PWM controller uses critical operating mode, and under critical operating mode, secondary current was equal to for zero phase Between, the voltage value on secondary side can be obtained by primary side, there is no need to additional sample networks, and adjustment of load can be realized.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this A little attached drawings obtain other attached drawings.

Fig. 1 is the circuit diagram of the output of ten tunnels according to the utility model embodiment transformer equalizing circuit.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art's every other embodiment obtained, all belongs to In the range of the utility model protection.

As shown in Figure 1, ten tunnel of one kind according to the utility model embodiment exports transformer equalizing circuit, including straight Input terminal is flowed, the direct-flow input end is connected with PWM controller, and the PWM controller is connected with the primary side of transformer, the change The primary side of depressor is also connected with metal-oxide-semiconductor, and the metal-oxide-semiconductor is connect with the PWM controller, and the secondary side of the transformer has ten Secondary windings, described ten secondary windings are all connected with output end.

In a specific embodiment of the utility model, the PWM controller is isolated form flyback controller.

In a specific embodiment of the utility model, the model LT3748 of the PWM controller.

In a specific embodiment of the utility model, the end RFB of the PWM controller connects the original of the transformer Side, the pole G of the metal-oxide-semiconductor connect the end Gate of the PWM controller, and the pole D of the metal-oxide-semiconductor connects the original of the transformer The pole S on side, the metal-oxide-semiconductor connects the end Sense of the PWM controller.

In a specific embodiment of the utility model, the transformer is flat-plate transformer.

In a specific embodiment of the utility model, the transformer uses ER23 FERRITE CORE.

In order to facilitate the above-mentioned technical proposal for understanding the utility model, below by way of specifically used mode to the utility model Above-mentioned technical proposal be described in detail.

The model LT3478 of PWM controller, uses the waveform of transformer primary edge-impulse as feedback quantity.It is not necessarily in this way Optocoupler or additional winding.Output voltage relies on two resistance adjustments.LT3478 use critical operating mode (CCM and DCM it Between).Under critical operating mode, during secondary current is equal to zero, the voltage value on secondary side can be obtained by primary side.There is no need to Adjustment of load can be realized in additional sample network.

Critical operating mode is a kind of current mode frequency control.When metal-oxide-semiconductor (or being MOSFET) conducting after, inductance and Voltage on Sense is begun to ramp up, and when the voltage on Sense reaches the voltage of 11 foot Vc, the electric current in PWM controller compares Device exports high level, the rest-set flip-flop overturning in PWM controller, pole=0 Q=0(, that is, metal-oxide-semiconductor G), metal-oxide-semiconductor shutdown.Work as metal-oxide-semiconductor After shutdown, the current potential of the pole metal-oxide-semiconductor D is begun to ramp up, and secondary side is folded to the voltage of primary side.When under the electric current of the rectifier diode on secondary side When dropping to zero, the current potential of the pole metal-oxide-semiconductor D is equal to Vin, and the electric current that the transistor in PWM controller flows through is reduced, and comparator output is high Level, by with pole=1 S that makes metal-oxide-semiconductor behind the door, then rest-set flip-flop exports high level, and metal-oxide-semiconductor is begun to turn on.

Due to perceiving the secondary current null moment using critical conduction mode, the pressure drop of dead resistance will not cause Adjust error.Compared with CCM operating mode, the volume of transformer can reduce and will not cause subharmonic oscillation.

In the case where low current exports operating condition, PWM controller postpones the turn-on time of metal-oxide-semiconductor, therefore PWM controller work exists DCM mode.And traditional circuit of reversed excitation is the opening time that pipe is determined according to updated output voltage.As Vc < 0.6v, electricity Stream comparator A2 is reduced to its minimum value, and variable delay timer (Variable delay timer) is before metal-oxide-semiconductor conducting It waits always and sets 0, can be before MOSFET conducting using additional delay, PWM controller part works in DCM mode.

The utility model is equal using advanced PSR primary-side-control technology and inverse-excitation type conversion arrival Multiple coil output electric current Weighing apparatus, key element is a transformer, and effect is to realize that energy shifts between single battery, which is according to flyback Transformer principle construction, it is therefore an objective to solve the current balance of transformer secondary Multiple coil output, i.e. the program can be complete The real time equaliser in charging is realized on ground, guarantees that every batteries can be full of when charging.And transfer efficiency is improved, reach 80% or more, as crucial technological difficulties, technical points mainly embody a concentrated expression of the design of transformer and the work of actual fabrication Skill is horizontal, such as needs to consider many factors in selection copper wire, core material and the method for coiling.In actual operation using flat Board transformer improves efficiency.Transformer is flat-plate transformer, and leakage inductance is very small, and transformer uses ER23 FERRITE CORE, more Manufacturer, family can provide this core material.Ferrite Material selects 3F3, N49 or other same type of material, they are big in frequency Core loss is lower when 250kHz.

The primary side of transformer has an armature winding, and the secondary side of transformer has ten secondary windings, armature winding and Secondary windings is made of 5 layers of 70 μm of copper foil, and respectively by 80 μm of insulator separations.Auxiliary winding circuit is connected to by enameled wire TOP layers.

Output transformer equalizing circuit in ten tunnels described in the utility model can input the DC input voitage of wide scope: DC36V—72V.Its operating ambient temperature is -25 DEG C -+40 DEG C, and it is anti-reverse that the utility model is additionally provided with DC supply input Circuit, DC supply input reverse-connection preventing circuit include diode D1.

The utility model forms single-ended reverse exciting circuit by a PWM controller and metal-oxide-semiconductor.

In conclusion PWM controller uses transformer primary edge-impulse by means of the above-mentioned technical proposal of the utility model Waveform is not necessarily to optocoupler or additional winding, PWM controller uses critical operating mode, in critical operating mode as feedback quantity Under, during secondary current is equal to zero, the voltage value on secondary side can be obtained by primary side, there is no need to additional sample networks can be realized Adjustment of load.

The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all practical at this Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model Within the scope of shield.

Claims (6)

1. a kind of ten tunnels export transformer equalizing circuit, including direct-flow input end, the direct-flow input end are connected with PWM control Device, the PWM controller are connected with the primary side of transformer, which is characterized in that and the primary side of the transformer is also connected with metal-oxide-semiconductor, The metal-oxide-semiconductor is connect with the PWM controller, and the secondary side of the transformer has ten secondary windings, described ten secondary around Group is all connected with output end.

2. ten tunnel according to claim 1 exports transformer equalizing circuit, which is characterized in that the PWM controller be every Release flyback controller.

3. ten tunnel according to claim 2 exports transformer equalizing circuit, which is characterized in that the type of the PWM controller Number be LT3748.

4. ten tunnel according to claim 3 exports transformer equalizing circuit, which is characterized in that the RFB of the PWM controller End connects the primary side of the transformer, and the pole G of the metal-oxide-semiconductor connects the end Gate of the PWM controller, the pole D of the metal-oxide-semiconductor The primary side of the transformer is connected, the pole S of the metal-oxide-semiconductor connects the end Sense of the PWM controller.

5. ten tunnel according to claim 1 exports transformer equalizing circuit, which is characterized in that the transformer is plate change Depressor.

6. ten tunnel according to claim 2 exports transformer equalizing circuit, which is characterized in that the transformer uses ER23 FERRITE CORE.