CN205584036U - Constant current power supply adapter - Google Patents

Abstract

The utility model relates to a constant current power supply adapter, including emi circuit module, rectifier module, power conversion module, PWM control module, voltage output module, voltage stabilizing module and constant -current module, emi circuit module, rectifier module, power conversion module, voltage output module, voltage stabilizing module and PWM control module connect gradually, PWM control module still is connected with the power conversion module, constant -current module and voltage output module are connected, voltage output module and outside being connected with electrical apparatus, and constant -current module still is connected with voltage stabilizing module, external power source is still connected to the emi circuit module. The utility model discloses a voltage stabilizing module connects constant -current module, and constant -current module connects voltage output module, makes voltage in voltage output module's material benefit because this constant -current module's regulating action and have the stable effect of constant current, export stable voltage to with on the electrical apparatus, realizes working under the stable voltage and effective life -saving with electrical apparatus.

Description

A kind of constant current source adapter

Technical field

This utility model relates to adapter, particularly relates to a kind of constant current source adapter.

Background technology

In daily life; electric equipment products are tinkling of jades meets the eye on every side; such as laptop computer or flashlight; or even the every aspect of mobile phone etc., these electric equipments suffer from a common ground, it is simply that need the auxiliary of an adapter; by being low-voltage in high voltage transformation; alternating current is become unidirectional current, makes electrical appliance can work at preferable preset voltage value, preferable energy-saving effect can also be realized after protection electrical equipment.

But, the primary structure of conventional adapter is transformator compatibility commutator composition, the civil power buckling realizing high-voltage alternating is relative low-voltage dc voltage, for transformator, it is made up of iron core (or magnetic core) and coil, coil has two or more winding, the winding wherein connecing power supply is primary coil, another winding is secondary coil, for having the undulating state of interruption between primary coil and secondary coil, cause exported spread of voltage, for needing the electrical appliance of constant current, once use the adapter without constant pressure and flow, then mean that working effect is undesirable and the problem such as life-span minimizing.

Utility model content

For above-mentioned technical problem, the purpose of this utility model is to provide a kind of constant current source adapter, on it can regulate to the stable voltage output of constant current to electrical appliance, it is achieved electrical appliance works under voltage stabilizing.

For achieving the above object, this utility model adopts the following technical scheme that

A kind of constant current source adapter, including EMI circuit module, rectification filtering module, power conversion modules, PWM control module, voltage output module, Voltage stabilizing module and constant flow module；Described EMI circuit module, rectification filtering module, power conversion modules, voltage output module, Voltage stabilizing module and PWM control module are sequentially connected with, the outfan of described PWM control module is also connected with the input of power conversion modules, the outfan of described constant flow module is connected with the input of voltage output module, the outfan of voltage output module is connected with outside electrical appliance, the input of constant flow module is also connected with the outfan of Voltage stabilizing module, and the input of described EMI circuit module is also connected with external power source.

Preferably, constant flow module includes that constant current chip U1, resistance R1 are to resistance R7, electric capacity C1 to electric capacity C3, diode D1 and diode D2；One end of described resistance R1 connects the negative pole of diode D1, the positive pole of diode D1 and the positive pole of diode D2 are all connected with Voltage stabilizing module, the other end of resistance R1 and one end of resistance R2 are all connected with second pin of constant current chip U1, the other end of resistance R2 connects one end of electric capacity C1, and one end of the other end of electric capacity C1, one end of resistance R3 and electric capacity C2 is all connected with the 3rd pin of constant current chip U1；The other end of resistance R3 is all connected with voltage output module with the other end of electric capacity C2；One end of resistance R4 and one end of resistance R5 are all connected with the 4th pin of constant current chip U1, the other end of resistance R4 and the 5th equal ground connection of pin of constant current chip U1, the other end of resistance R5 and one end of resistance R6 are all connected with the 6th pin of constant current chip U1, and the other end of resistance R6 and first pin of constant current chip U1 are all connected with Voltage stabilizing module；The negative pole of diode D2 and one end of electric capacity C3 all one end with resistance R7 are connected, the other end of resistance R7 connects the 8th pin of constant current chip U1, the other end of electric capacity C3 connects the 7th pin of constant current chip U1, and the 7th pin of constant current chip U1 is also connected with Voltage stabilizing module.

Preferably, described PWM control module includes that control chip U2, resistance R8 are to resistance R11, electric capacity C4, electric capacity C5 and diode D3；First pin of described control chip U2 is connected with one end of resistance R8, the other end of resistance R8 connects the negative pole of diode D3, one end of resistance R9 and one end of resistance R10 all positive poles with diode D3 are connected, and one end of resistance R10 also other end with resistance R9 is connected；The other end of resistance R10, second pin of control chip U2, the 3rd pin of control chip U2 are all connected with power conversion modules；One end of electric capacity C4 connects the 3rd pin of control chip U2, the other end of electric capacity C4 and one end of electric capacity C5 are all connected with the 4th pin of control chip U2, the other end of electric capacity C5 connects the 6th pin of control chip U2, and the 6th pin of control chip U2 is also connected with power conversion modules；One end of described electric capacity C5 and one end of resistance R11 are all connected with power conversion modules, and the other end of resistance R11 connects the 7th pin of control chip U2；5th pin of control chip U2 connects Voltage stabilizing module.

Compared to existing technology, the beneficial effects of the utility model are:

This utility model connects constant flow module by Voltage stabilizing module, constant flow module connects voltage output module, voltage is made to have, due to the regulation effect of this constant flow module, the effect that constant current is stable in the material benefit of voltage output module, export stable voltage to electrical appliance, it is achieved electrical appliance effectively extends the life-span at stable operating at voltages.

Accompanying drawing explanation

Fig. 1 is circuit structure diagram of the present utility model.

Wherein, 1, EMI circuit module；2, rectification filtering module；3, power conversion modules；4, PWM control module；5, voltage output module；6, Voltage stabilizing module；7, constant flow module.

Detailed description of the invention

Below, in conjunction with accompanying drawing and detailed description of the invention, this utility model is described further:

Seeing Fig. 1, this utility model provides a kind of constant current source adapter, and it includes EMI circuit module 1, rectification filtering module 2, power conversion modules 3, PWM control module 4, voltage output module 5, Voltage stabilizing module 6 and constant flow module 7；Described EMI circuit module 1, rectification filtering module 2, power conversion modules 3, voltage output module 5, Voltage stabilizing module 6 and PWM control module 4 are sequentially connected with, wherein, the outfan of EMI circuit module 1 is connected with the input of rectification filtering module 2, the outfan of rectification filtering module 2 connects the input of power conversion modules 3, the outfan of power conversion modules 3 is connected with the input of voltage output module 5, and the outfan of voltage output module 5 is connected with the input of Voltage stabilizing module；The outfan of Voltage stabilizing module 6 is connected with the input of PWM control module 4, the outfan of PWM control module 4 also input with power conversion modules 3 is connected, the outfan of described constant flow module 7 is connected with the input of voltage output module 5, the outfan of voltage output module 5 is connected with outside electrical appliance, the input of constant flow module 7 is connected with Voltage stabilizing module 6, and the input of described EMI circuit module 1 connects external power source.

Wherein, constant flow module 7 includes that constant current chip U1, resistance R1 are to resistance R7, electric capacity C1 to electric capacity C3, diode D1 and diode D2；One end of described resistance R1 connects the negative pole of diode D1, the positive pole of diode D1 and the positive pole of diode D2 are all connected with Voltage stabilizing module 6, the other end of resistance R1 and one end of resistance R2 are all connected with the second pin b1 of constant current chip U1, the other end of resistance R2 connects one end of electric capacity C1, and one end of the other end of electric capacity C1, one end of resistance R3 and electric capacity C2 is all connected with the 3rd pin c1 of constant current chip U1；The other end of resistance R3 is all connected with voltage output module 5 with the other end of electric capacity C2；One end of resistance R4 and one end of resistance R5 are all connected with the 4th pin d1 of constant current chip U1, the other end of resistance R4 and the 5th equal ground connection of pin e1 of constant current chip U1, the other end of resistance R5 and one end of resistance R6 are all connected with the 6th pin f1 of constant current chip U1, and the other end of resistance R6 and the first pin a1 of constant current chip U1 are all connected with Voltage stabilizing module 6；The negative pole of diode D2 and one end of electric capacity C3 all one end with resistance R7 are connected, the other end of resistance R7 connects the 8th pin h1 of constant current chip U1, the 7th pin g1 of the 7th pin g1, constant current chip U1 that the other end of electric capacity C3 connects constant current chip U1 is also connected with Voltage stabilizing module 6.

PWM control module 4 includes that control chip U2, resistance R8 are to resistance R11, electric capacity C4, electric capacity C5 and diode D3；One end of first pin a2 and the resistance R8 of described control chip U2 is connected, the other end of resistance R8 connects the negative pole of diode D3, one end of resistance R9 and one end of resistance R10 all positive poles with diode D3 are connected, and one end of resistance R10 also other end with resistance R9 is connected；The other end of resistance R10, the second pin b2 of control chip U2, the 3rd pin c2 of control chip U2 are all connected with power conversion modules 3；One end of electric capacity C4 connects the 3rd pin c2 of control chip U2, the other end of electric capacity C4 and one end of electric capacity C5 are all connected with the 4th pin d2 of control chip U2, the 6th pin f2 of the 6th pin f2, control chip U2 that the other end of electric capacity C5 connects control chip U2 is also connected with power conversion modules 3；One end of described electric capacity C5 and one end of resistance R11 are all connected with power conversion modules 3, and the other end of resistance R11 connects the 7th pin g2 of control chip U2；The 5th pin e2 of control chip U2 connects Voltage stabilizing module 6.The model of control chip U2 for example, LD7575.

nullIn power conversion modules 3, there is high frequency transformer，Constant current chip U1 has been internally integrated operational amplifier，HVDC is first supplied electricity to the transformer-supplied in power conversion modules 3 by EMI circuit module 1 and rectification filtering module 2，Another road provides startup voltage through resistance blood pressure lowering to the control chip U2 of PWM control module 4，On-off circuit is controlled by the pulse signal within control chip U2，Turning in turn and ending the purpose reaching to change pulse direct current by control chip U2，It is converted into high-frequency pulse direct current，Now，Pulse direct current is transported to the high frequency transformer in power conversion modules 3 and carries out blood pressure lowering，The low-voltage filter circuit being made up of diode and filter capacitor again carries out rectification and filtering，Obtain output voltage，Constant current chip U1 for the constant flow module 7 of rear class provides voltage，The operational amplifier in constant current chip U1 is made to provide signal to the photoelectrical coupler in Voltage stabilizing module 6，Again on the main IC foot in bonder feeds back to Voltage stabilizing module 6，Thus control stablizing of output voltage，Thus the function of constant pressure and flow can be realized，The stability of equipment is effectively ensured and extends the life-span of electric equipment.

Above-mentioned particular circuit configurations is one of which embodiment of the present utility model, is not limited in this circuit structure.

It will be apparent to those skilled in the art that can technical scheme as described above and design, make other various corresponding changes and deformation, and within all these changes and deformation all should belong to this utility model scope of the claims.

Claims (3)

1. a constant current source adapter, it is characterised in that include EMI circuit module, rectification filtering module, power conversion modules, PWM control module, voltage output module, Voltage stabilizing module and constant flow module；Described EMI circuit module, rectification filtering module, power conversion modules, voltage output module, Voltage stabilizing module and PWM control module are sequentially connected with, the outfan of described PWM control module is also connected with the input of power conversion modules, the outfan of described constant flow module is connected with the input of voltage output module, the outfan of voltage output module is connected with outside electrical appliance, the input of constant flow module is also connected with the outfan of Voltage stabilizing module, and the input of described EMI circuit module is also connected with external power source.

2. constant current source adapter as claimed in claim 1, it is characterised in that constant flow module includes that constant current chip U1, resistance R1 are to resistance R7, electric capacity C1 to electric capacity C3, diode D1 and diode D2；One end of described resistance R1 connects the negative pole of diode D1, the positive pole of diode D1 and the positive pole of diode D2 are all connected with Voltage stabilizing module, the other end of resistance R1 and one end of resistance R2 are all connected with second pin of constant current chip U1, the other end of resistance R2 connects one end of electric capacity C1, and one end of the other end of electric capacity C1, one end of resistance R3 and electric capacity C2 is all connected with the 3rd pin of constant current chip U1；The other end of resistance R3 is all connected with voltage output module with the other end of electric capacity C2；One end of resistance R4 and one end of resistance R5 are all connected with the 4th pin of constant current chip U1, the other end of resistance R4 and the 5th equal ground connection of pin of constant current chip U1, the other end of resistance R5 and one end of resistance R6 are all connected with the 6th pin of constant current chip U1, and the other end of resistance R6 and first pin of constant current chip U1 are all connected with Voltage stabilizing module；The negative pole of diode D2 and one end of electric capacity C3 all one end with resistance R7 are connected, the other end of resistance R7 connects the 8th pin of constant current chip U1, the other end of electric capacity C3 connects the 7th pin of constant current chip U1, and the 7th pin of constant current chip U1 is also connected with Voltage stabilizing module.

3. constant current source adapter as claimed in claim 2, it is characterised in that described PWM control module includes that control chip U2, resistance R8 are to resistance R11, electric capacity C4, electric capacity C5 and diode D3；First pin of described control chip U2 is connected with one end of resistance R8, the other end of resistance R8 connects the negative pole of diode D3, one end of resistance R9 and one end of resistance R10 all positive poles with diode D3 are connected, and one end of resistance R10 also other end with resistance R9 is connected；The other end of resistance R10, second pin of control chip U2, the 3rd pin of control chip U2 are all connected with power conversion modules；One end of electric capacity C4 connects the 3rd pin of control chip U2, the other end of electric capacity C4 and one end of electric capacity C5 are all connected with the 4th pin of control chip U2, the other end of electric capacity C5 connects the 6th pin of control chip U2, and the 6th pin of control chip U2 is also connected with power conversion modules；One end of described electric capacity C5 and one end of resistance R11 are all connected with power conversion modules, and the other end of resistance R11 connects the 7th pin of control chip U2；5th pin of control chip U2 connects Voltage stabilizing module.