CN207399047U - Supply voltage conversion circuit and L ED power supply system - Google Patents
Supply voltage conversion circuit and L ED power supply system Download PDFInfo
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- CN207399047U CN207399047U CN201721490456.6U CN201721490456U CN207399047U CN 207399047 U CN207399047 U CN 207399047U CN 201721490456 U CN201721490456 U CN 201721490456U CN 207399047 U CN207399047 U CN 207399047U
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- 238000006243 chemical reaction Methods 0.000 title claims description 46
- 238000004804 winding Methods 0.000 claims abstract description 52
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 39
- 230000036772 blood pressure Effects 0.000 claims description 35
- 230000005611 electricity Effects 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000003760 hair shine Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000006837 decompression Effects 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
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- 230000006641 stabilisation Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
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Abstract
The utility model discloses a supply voltage converting circuit and L ED power supply system, the circuit includes step-down voltage stabilizing module, switch module and is used for becoming the alternating current commercial power and becomes the vary voltage module that can provide DC voltage for outside L ED lighting circuit, and the vary voltage module includes the multiple winding transformer, and the first winding output of the first winding of multiple winding transformer is used for exporting DC voltage, and switch module has and is used for controlling whether to provide for outside L ED lighting circuit DC voltage with be used for controlling when control provides DC voltage for outside L ED lighting circuit DC voltage's switch on and turn-off time proportion's function, step-down voltage stabilizing module do the DC voltage step-down voltage stabilizing of switch module output provides negative feedback voltage for switch module adopts the utility model discloses, required device is few, and is with low costs.
Description
Technical field
The utility model is related to electronic circuit technology fields, and in particular to a kind of supply voltage conversion circuit and a kind of LED
Electric power system.
Background technology
Switching Power Supply is quickly popularized and widely due to its advantage efficient, small, light-weight, with high accuracy
Using.Power semiconductor electronic device high speed development, power supply theoretical research deepen continuously, and various topologys are in the application of various product
Increasingly mature, the shipment amount of various product is also increasing, and at this time caused by devices in batches produces inconsistency
It is bad more and more common.
Transformer in Switching Power Supply is extremely critical device.The mode of production of transformer is still with semi-automatic life now
Based on production, the ability of practitioner and the technique of production are to influence the problem of transformer uniformity is maximum.Such as the leakage between winding
It is exactly one of example to feel parameter.For multiwinding transformer when producing in enormous quantities, leakage inductance parameter differences are very big.And transformer this
One parameter can influence the intermodulation performance of each winding voltage of power supply.When having, winding load is very heavy, when having winding light load, can go out
The winding voltage that now band gently loads floats high phenomenon, and leakage inductance size has very big relation between floating high degree and winding.
For solution more than technical problem, the present inventor invents a kind of LED electric power systems, as shown in Figure 1, including：LED shines
Circuit, switch module, voltage changing module and use for electric main to be become to provide for the LED illuminating circuits DC voltage
In the voltage increase and current constant module for driving the LED illuminating circuits work.By providing output DC voltage for LED illuminating circuits
First winding output terminal sets a switch module, and the switch control terminal of the switch module and the driving controlled end of boost module connect
It connects, then when controlled terminal is driven to be not received by LED control signal, switch module disconnects switch input terminal and exported with switch
The connection at end, then electric current can not be conducted to LED illuminating circuits, even if so as to realize the multiwinding transformer in voltage changing module
The load of other winding output terminals changes and the first winding output end voltage is caused to raise, and can not also make LED illuminating circuits
The phenomenon that shining during in holding state.
But there are one defects for above-mentioned technical proposal tool：Switch module is respectively necessary for a switching tube with voltage increase and current constant module
Control and two functions of the HF switch of power conversion are switched to realize, required device is more, of high cost.
Utility model content
The purpose of this utility model is to provide a kind of supply voltage conversion circuit and LED electric power systems, can avoid LED
Is there is the phenomenon that luminous glimmer in illuminating circuit in the case of standby, and required device is few, at low cost, reliability higher.
For solution more than technical problem, the utility model embodiment provides a kind of supply voltage conversion circuit, including：Decompression
Voltage stabilizing module, switch module and the change pressing mold for electric main to be become to provide for external LED illuminating circuit DC voltage
Block；
The voltage changing module includes multiwinding transformer, and the first winding of the multiwinding transformer has for exporting
State the first winding output terminal of DC voltage；
The switch module has the switch control for controlling whether to provide the DC voltage for external LED illuminating circuit
End processed, for controlling the conducting and shut-off of the DC voltage when control provides DC voltage for external LED illuminating circuit when
Between ratio Duty ratio control end, switch input terminal and output switching terminal；
The lowering and stabilizing blood pressure module has voltage input end and the voltage output for being connected with external LED illuminating circuit
End；
The first winding output terminal is connected with the switch input terminal, the output switching terminal and the voltage input end
Connection, the voltage output end are connected with the Duty ratio control end.
Further, the switch module includes first switch pipe and/or logic unit；
Described or logic unit first input end is connected with the switch control terminal of the switch module, described or logic list
Second input terminal of member is connected with the Duty ratio control end of the switch module；Described or logic unit output terminal and described the
The control terminal connection of one switching tube；
The input terminal of the first switch pipe is connected with the switch input terminal of the switch module, the first switch pipe
Output terminal is connected with the output switching terminal of the switch module.
Further, the switch module further includes second switch pipe；
Described or logic unit first input end is connected with the switch control terminal of the switch module, is specially：
Described or logic unit first input end is connected with the input terminal of the second switch pipe, the second switch pipe
Output terminal be connected to ground, the control terminal of the second switch pipe is connected with the switch control terminal of the switch module.
Further, the lowering and stabilizing blood pressure module includes inductance, the first diode and the first capacitance；
The first end of the inductance is connected with the voltage input end of the lowering and stabilizing blood pressure module, the second end of the inductance with
The voltage output end connection of the lowering and stabilizing blood pressure module；The anode of first diode is connected to ground, first diode
Cathode be connected with the first end of the inductance；The first end of first capacitance is connected with the cathode of first diode,
The second end of first capacitance is connected with the second end of the inductance.
Further, the supply voltage conversion circuit includes first resistor and second resistance；
The voltage output end is connected with the Duty ratio control end, is specially：
The first end of the first resistor is connected with the voltage output end, and the second end of the first resistor is accounted for described
Sky is connected than control terminal, and the first end of the second end of the first resistor also with the second resistance is connected, the second resistance
Second end be connected to ground.
Further, the voltage changing module includes the second diode and the second capacitance；First winding has to feel
Answer the current input terminal and current output terminal of the electric main after transformation；
The anode of second diode is connected with the current output terminal of first winding, and second diode is born
Pole is connected with the first winding output terminal；The first end of second capacitance is connected with the cathode of second diode, institute
The second end for stating the second capacitance is connected with the current input terminal of first winding, and the second end of second capacitance also connects with ground
It connects.
Further, the second switch pipe is NPN type triode；
The input terminal of the second switch pipe is the collector of NPN type triode, and the control terminal of the second switch pipe is
The base stage of NPN type triode, the output terminal of the second switch pipe are the emitter of NPN type triode.
Further, the switch module further includes 3rd resistor and the 4th resistance；
The control terminal of the second switch pipe is connected with the switch control terminal of the switch module, is specially：
The first end of the 3rd resistor is connected with the switch control terminal of the switch module, and the second of the 3rd resistor
End is connected with the control terminal of the second switch pipe, and the second end of the 3rd resistor also connects with the first end of the 4th resistance
It connects, the second end of the 4th resistance is connected to ground.
Yet further, the first switch pipe and/or logic unit that the switch module includes are integrated in a chip.
Correspondingly, the utility model embodiment provides also a kind of LED electric power systems, including supply voltage conversion circuit with
LED illuminating circuits, wherein, the supply voltage conversion circuit is the supply voltage conversion circuit that foregoing any embodiment provides.
Compared with the prior art, the beneficial effects of the utility model are：
Supply voltage conversion circuit provided by the utility model has to control simultaneously by providing a switch module
Whether for external LED illuminating circuit the switch control terminal of the DC voltage is provided and for being that external LED shines electricity when control
Road controls the conducting of the DC voltage and the Duty ratio control end of turn-off time ratio when providing DC voltage, switch is controlled
HF switch with realizing power switching is integrated in same switch module, so that device greatly reduces, it is cost-effective.
And when switch control terminal input high level or logic unit is turned on first switch pipe, the more of output DC voltage are provided
First winding output HIGH voltage of winding transformer gives lowering and stabilizing blood pressure module, is exported after lowering and stabilizing blood pressure module lowering and stabilizing blood pressure to LED
Illuminating circuit, LED shine；When switch control terminal input low level or logic unit is not turned on first switch pipe, and decompression is steady
Die block does not have control source, output voltage zero, and LED illuminating circuits do not work, even if so as to fulfill more in voltage changing module
The load of other winding output terminals of winding transformer changes and the first winding output end voltage is caused to raise, and also avoids
The phenomenon that LED illuminating circuits shine when being in holding state.And the utility model also provides a kind of LED electric power systems,
There is identical technique effect with supply voltage conversion circuit provided by the utility model.
Description of the drawings
Fig. 1 is the structure diagram of the one embodiment for the LED electric power systems that the prior art provides；
Fig. 2 is the structure diagram of one embodiment of supply voltage conversion circuit provided by the utility model；
Fig. 3 is the structural representation of one embodiment of the switch module of supply voltage conversion circuit provided by the utility model
Figure；
Fig. 4 is that the structure of another embodiment of the switch module of supply voltage conversion circuit provided by the utility model is shown
It is intended to；
Fig. 5 is the structure of one embodiment of the lowering and stabilizing blood pressure module of supply voltage conversion circuit provided by the utility model
Schematic diagram.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, 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 embodiment in the utility model, those of ordinary skill in the art are without creative efforts
All other embodiments obtained shall fall within the protection scope of the present invention.
In existing LED electric power systems, in order to solve the problems, such as that original LED circuit exists:When transformer in circuit
During the overload of other winding output terminal institute bands, then the load of the first winding output institute band of transformer is defeated with respect to other windings
The light load of outlet institute band, and since the leakage inductance parameter between winding has differences, cause the first winding output terminal of transformer
The direct current power source voltage rise of offer, and then the first winding output terminal based on transformer directly provides DC power supply and is sent out to LED
On the premise of optical circuit, direct current power source voltage value is it is possible that occur being more than LED lasing thresholds so that LED illuminating circuits are not having
In the case of being subject to occur as soon as in the case of voltage increase and current constant module drive and shining, i.e., without reception user starting-up signal feelings
Condition, LED just shine, and such situation user is believed that failure.Therefore the prior art is in the output of the first winding of transformer
End sets a switch module, and switch module includes a metal-oxide-semiconductor, which plays a part of to switch pipe, when LED light emitting controls
Unit does not provide luminous signal to voltage increase and current constant module come when driving the LED illuminating circuits to shine, the switch control terminal of switch module
It is disconnected with output switching terminal, so even if the first winding output end voltage for transformer occur floats high situation, LED shines
The phenomenon that luminous glimmer will not occur in circuit in the state of standby.However, the voltage increase and current constant module due to the prior art
There are one metal-oxide-semiconductors, play HF switch, therefore the LED electric power systems of the prior art need two metal-oxide-semiconductors, and then need
More devices drive two MOS work, and the cost of manufacture of circuit is high.
Therefore, in order to reduce device and cost, the utility model proposes following supply voltage conversion circuits：Referring to Fig. 2,
It is the structure diagram of one embodiment of supply voltage conversion circuit provided by the utility model, supply voltage conversion is electric
Road, including being used to becoming electric main into voltage changing module 10, the switch module that can provide DC voltage for external LED illuminating circuit
20th, lowering and stabilizing blood pressure module 30；
The voltage changing module 10 includes multiwinding transformer, and the first winding of the multiwinding transformer has to export
First winding output terminal of the DC voltage；
The switch module 20 has the switch for controlling whether to provide the DC voltage for external LED illuminating circuit
Control terminal EN, conducting and pass for controlling the DC voltage when control provides DC voltage for external LED illuminating circuit
Duty ratio control end DC-EN, switch input terminal IN and the output switching terminal OUT of disconnected time scale；
The lowering and stabilizing blood pressure module 30 includes voltage input end and the voltage output for being connected with external LED illuminating circuit
Hold V；
The first winding output terminal is connected with the switch input terminal IN, the output switching terminal OUT and the voltage
Input terminal connects, and the voltage output end V is connected with the Duty ratio control end DC-EN.
Supply voltage conversion circuit provided by the utility model has to control simultaneously by providing a switch module
Whether for external LED illuminating circuit the switch control terminal of the DC voltage is provided and for being that external LED shines electricity when control
Road controls the conducting of the DC voltage and the Duty ratio control end of turn-off time ratio when providing DC voltage, switch is controlled
HF switch with realizing power switching is integrated in same switch module, so that number of devices greatly reduces, is saved
Cost.Switch module is set between the voltage changing module of supply voltage conversion circuit and lowering and stabilizing blood pressure module, the of voltage changing module
The switch input terminal of one winding output terminal and switch module connects, the voltage input end of lowering and stabilizing blood pressure module and opening for switch module
Close output terminal connection, only switch module switch control terminal receive allow outer blaze circuit work high level signal
When, switch module is started to work, the switch input terminal of switch module and the conducting of Duty ratio control end, the switch input of switch module
End is connected with the first winding output terminal of voltage changing module, and voltage flows to lowering and stabilizing blood pressure module by the output switching terminal of switch module
Voltage input end, after lowering and stabilizing blood pressure module carries out lowering and stabilizing blood pressure processing to voltage, the voltage output end of lowering and stabilizing blood pressure module will
Direct voltage output gives external LED illuminating circuit, and LED just shines at this time；And what the switch control terminal of switch module received is
Low level signal does not work then, and switch module is disconnected with voltage changing module, and supply voltage conversion circuit does not work, without electricity
Pressure output, therefore external LED does not shine.
Fig. 3 is referred to, is one embodiment of the switch module of supply voltage conversion circuit provided by the utility model
Structure diagram；The tool of the integrated chip U1 of supply voltage conversion circuit provided by the utility model is described below with reference to Fig. 3
Body structure：
The switch module 20 includes first switch pipe Q1 and/or logic unit；
Described or logic unit first input end A is connected with the switch control terminal EN of the switch module 20, it is described or
Second input terminal B of logic unit is connected with the Duty ratio control end BC-EN of the switch module 20；It is described or logic unit
Output terminal C is connected with the control terminal of the first switch pipe Q1；
The input terminal of the first switch pipe Q1 is connected with the switch input terminal IN of the switch module 20, and described first opens
The output terminal for closing pipe Q1 is connected with the output switching terminal OUT of the switch module 20.
Preferably, the first switch pipe Q1 and/or logic unit are integrated in chip U1, specifically as shown in figure 4, this is opened
It closes module 20 and further includes second switch pipe Q2；
Described or logic unit first input end A is connected with the switch control terminal EN of the switch module 20, is specially：
Described or logic unit first input end A is connected with the input terminal of the second switch pipe Q2, and described second opens
The output terminal for closing pipe Q2 is connected to ground, the control terminal of the second switch pipe Q2 and the switch control terminal EN of the switch module 20
Connection.
Further, the supply voltage conversion circuit includes first resistor R1 and second resistance R2；
The voltage output end V is connected with the Duty ratio control end DC-EN, is specially：
The first end of the first resistor R1 is connected with the voltage output end V, the second end of the first resistor R1 with
The Duty ratio control end DC-EN connections, the second end of the first resistor R1 also connect with the first end of the second resistance R2
It connects, the second end of the second resistance R2 is connected to ground.
Further, the voltage changing module 10 includes the second diode D2 and the second capacitance C2；First winding has
For sensing the current input terminal of the electric main after transformation and current output terminal；
The anode of the second diode D2 is connected with the current output terminal V of first winding, second diode
The cathode of D2 is connected with the first winding output terminal；The first end of the second capacitance C2 is negative with the second diode D2's
Pole connects, and the second end of the second capacitance C2 is connected with the current input terminal of first winding, the second capacitance C2's
Second end is also connected to ground.
Further, the second switch pipe Q2 is NPN type triode；
The input terminal of the second switch pipe Q2 be NPN type triode collector, the control of the second switch pipe Q2
The base stage for NPN type triode is held, the output terminal of the second switch pipe Q2 is the emitter of NPN type triode.
Further, the switch module further includes 3rd resistor R3 and the 4th resistance R4, the second switch pipe Q2's
Control terminal is connected with the switch control terminal EN of the switch module 20, is specially：
The first end of the 3rd resistor R3 is connected with the switch control terminal EN of the switch module 20, the 3rd resistor
The second end of R3 is connected with the control terminal of the second switch pipe Q2, and the second end of the 3rd resistor R3 is also electric with the described 4th
The first end connection of R4 is hindered, the second end of the 4th resistance R4 is connected to ground.
To be below metal-oxide-semiconductor by first switch pipe Q1, exemplified by second switch pipe Q2 is NPN type triode, and first opens
Exemplified by pass pipe Q1 and/or logic unit are integrated in a chip U1, the operation principle of the chip U1 of switch module is described：
The drain electrode connection of the 7th pin D of chip U1 and the first end and metal-oxide-semiconductor of 8 pin D short circuits and shorting stub, as the
The input terminal of one switching tube Q1, the 5th pin GND of the chip and the 6th pin GND short circuits and the first end and metal-oxide-semiconductor of shorting stub
Source electrode connection, as the output terminal of first switch pipe Q1, the grid of metal-oxide-semiconductor with or the output terminal C of logic unit be connected, as
The control terminal of first switch pipe Q1.
Due to the enabled foot that the 3rd pin ENB of chip U1 is chip, the chip U1 ability when the pin voltage is low level
Work；And when the voltage of the 3rd pin ENB of the chip is higher than for the voltage of the 1st pin VDD of low level and chip U1 inputs
During the operating voltage of chip U1, chip U1 could work；The 3rd pin ENB of chip U1 is or the first input end of logic unit
The 4th pin FB of A, chip U1 is or the second input terminal B of logic unit, which is the negative-feedback foot of chip U1, chip U1
At work, the negative feedback control inside chip U1 is passed through so that the voltage of the pin is stabilized in 2.5V, is set in the pin
Operating voltage can realize the output terminal of the negative-feedback function of chip U1 or the output terminal C and first switch pipe Q1 of logic unit
Connection.Since chip U1 is when the 3rd pin ENB is low level, as long as the 4th pin FB of chip U1 reaches operating voltage chip U1
It can work, then by the negative feedback control inside chip U1, make the voltage stabilization of the 4th pin FB in the work electricity of the pin
Pressure.
Fig. 4 is referred to, is one embodiment of the switch module of supply voltage conversion circuit provided by the utility model
Structure diagram；The work of the switch module 20 of supply voltage conversion circuit provided by the utility model is described below with reference to Fig. 3
Make principle：
When the switch control terminal EN of switch module 20 receives luminous signal (that is, the switch control of luminous controling unit transmission
When end EN processed is high level), by the partial pressure of R3 and R4, NPN type triode conducting, the 3rd pin ENB of integrated chip U1 is should
The enabled foot of chip, when receiving the low level after R3 and R4 partial pressures, which starts to work, and integrated chip U1
The 1st pin VDD at voltage be higher than the operating voltage of chip U1, chip U1 just starts to work, and passes through bearing inside chip U1
Feedback control so that the 4th pin FB of chip U1 stablizes the operating voltage 2.5V in the pin, and the metal-oxide-semiconductor inside chip U1 is led
It is logical, the second end of the shorting stub for the 7th and the 8th pin that the switch input terminal IN of switch module 20 passes through chip U1 and metal-oxide-semiconductor
Drain electrode connection, so switch input terminal IN is turned on, is connected with the first winding output terminal of voltage changing module 10, then the first winding exports
The output voltage 24V at end exports 16V after lowering and stabilizing blood pressure module 30 and gives external LED illuminating circuit.
When the luminous signal that the switch control terminal EN of switch module 20 does not receive luminous controling unit transmission (that is, switchs
When control terminal EN is low level), NPN type triode cut-off, chip U1 does not work, and the metal-oxide-semiconductor inside chip U1 does not work, switch
Module 20 does not work, and does not have voltage between the switch input terminal IN of switch module 20 and the first winding output terminal of voltage changing module 10
It flows through, external LED circuit does not work.
Fig. 5 is referred to, is an implementation of the lowering and stabilizing blood pressure module of supply voltage conversion circuit provided by the utility model
The structure diagram of example；
Compared to provided above, the lowering and stabilizing blood pressure module 30 of supply voltage conversion circuit provided in this embodiment further includes electricity
Feel L1, diode D1 and capacitance C1；
The lowering and stabilizing blood pressure module includes inductance L1, the first diode D1 and the first capacitance C1；
The first end of the inductance L1 is connected with the voltage input end of the lowering and stabilizing blood pressure module 30, and the of the inductance L1
Two ends are connected with the voltage output end of the lowering and stabilizing blood pressure module 30；The anode of the first diode D1 is connected to ground, described
The cathode of first diode D1 is connected with the first end of the inductance L1；The first end and the described 1st of the first capacitance C1
The cathode connection of pole pipe D1, the second end of the first capacitance C1 are connected with the second end of the inductance L1.
Supply voltage conversion circuit provided by the utility model, the lowering and stabilizing blood pressure module of the supply voltage conversion circuit
Voltage output end is connected with the Duty ratio control end of the supply voltage conversion circuit, when the switch control terminal of switch module receives
To allowing the instruction of outer blaze, i.e., when switch control terminal is high level, switch module work, at this point, the chip of switch module
4th pin FB is the feedback foot of the chip, is connected with the Duty ratio control end of switch module, voltage flows to lowering and stabilizing blood pressure module
When, since the cathode of the first diode is connected with the voltage input end of lowering and stabilizing blood pressure module, the first diode is not turned on, electricity
For pressure by making induction charging during inductance, the feedback voltage of chip is inputed to the first electricity by the Duty ratio control end of Simultaneous Switching module
Resistance and second resistance, the two resistance are connected respectively with lowering and stabilizing blood pressure module and voltage output end, therefore to lowering and stabilizing blood pressure module
Output voltage have partial pressure effect, finally export for outer blaze circuit work DC voltage；In the switch of switch module
Control terminal, which is not received by, allows the instruction of outer blaze, i.e., when switch control terminal is low level, switch module does not work, and decompression is steady
The voltage input end of die block does not have voltage to flow through, at this time the inductive discharge of lowering and stabilizing blood pressure module, and the voltage of releasing has for before
The voltage stored when voltage flows through, at this time the first diode operation, the first diode, the inductance and first of lowering and stabilizing blood pressure module 30
Capacitance forms a discharge loop, the time scale of loop works time interval decision-making circuit shut-off.Therefore switch module
Duty ratio control end can realize control control when providing DC voltage for outer blaze circuit the DC voltage conducting and
The ratio of turn-off time.
Compared with the prior art, a kind of advantageous effect of supply voltage conversion circuit of the utility model is：
By by metal-oxide-semiconductor with or logic gate be integrated in a chip so that switch module function has like the prior art
There is the function for the HF switch that control switchs and power is converted, and the device that circuit uses greatly reduces, low manufacture cost.Cause
It is connected for the 4th pin of chip and the Duty ratio control end of switch module, when MOS is turned on, the 4th pin stabilization of chip is in work
Make voltage 2.5V, and Duty ratio control end turns on, lowering and stabilizing blood pressure module section voltage can fall on electric L1, induction charging.And MOS
Pipe is closed, and the circuit being made of at this time inductance, the first diode and the first capacitance forms an electric discharge due to the electric discharge of inductance
Circuit, therefore, Duty ratio control end can be realized controls the direct current when control provides DC voltage for external LED illuminating circuit
The conducting of voltage and the ratio of turn-off time, reliability are high.
The above is the preferred embodiment of the utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of the utility model principle is not departed from, several improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the scope of protection of the utility model.
Claims (10)
1. a kind of supply voltage conversion circuit, which is characterized in that including：Lowering and stabilizing blood pressure module, switch module with for will exchange
Alternating current becomes that the voltage changing module of DC voltage can be provided for external LED illuminating circuit；
The voltage changing module includes multiwinding transformer, and the first winding of the multiwinding transformer has to export described straight
First winding output terminal of galvanic electricity pressure；
The switch module has to control whether the switch control for providing the DC voltage for external LED illuminating circuit
End, conducting and turn-off time for controlling the DC voltage when control provides DC voltage for external LED illuminating circuit
Duty ratio control end, switch input terminal and the output switching terminal of ratio；
The lowering and stabilizing blood pressure module has voltage input end and the voltage output end for being connected with external LED illuminating circuit；
The first winding output terminal is connected with the switch input terminal, and the output switching terminal connects with the voltage input end
It connects, the voltage output end is connected with the Duty ratio control end.
2. supply voltage conversion circuit as described in claim 1, which is characterized in that the switch module includes first switch pipe
And/or logic unit；
Described or logic unit first input end is connected with the switch control terminal of the switch module, described or logic unit
Second input terminal is connected with the Duty ratio control end of the switch module；Described or logic unit output terminal is opened with described first
Close the control terminal connection of pipe；
The input terminal of the first switch pipe is connected with the switch input terminal of the switch module, the output of the first switch pipe
End is connected with the output switching terminal of the switch module.
3. supply voltage conversion circuit as claimed in claim 2, which is characterized in that the switch module further includes second switch
Pipe；
Described or logic unit first input end is connected with the switch control terminal of the switch module, is specially：
Described or logic unit first input end is connected with the input terminal of the second switch pipe, the second switch pipe it is defeated
Outlet is connected to ground, and the control terminal of the second switch pipe is connected with the switch control terminal of the switch module.
4. supply voltage conversion circuit as described in claim 1, which is characterized in that the lowering and stabilizing blood pressure module include inductance,
First diode and the first capacitance；
The first end of the inductance is connected with the voltage input end of the lowering and stabilizing blood pressure module, the second end of the inductance with it is described
The voltage output end connection of lowering and stabilizing blood pressure module；The anode of first diode is connected to ground, and first diode is born
Pole is connected with the first end of the inductance；The first end of first capacitance is connected with the cathode of first diode, described
The second end of first capacitance is connected with the second end of the inductance.
5. supply voltage conversion circuit as described in claim 1, which is characterized in that the supply voltage conversion circuit includes the
One resistance and second resistance；
The voltage output end is connected with the Duty ratio control end, is specially：
The first end of the first resistor is connected with the voltage output end, the second end of the first resistor and the duty cycle
Control terminal connects, and the first end of the second end of the first resistor also with the second resistance is connected, and the of the second resistance
Two ends are connected to ground.
6. supply voltage conversion circuit as described in claim 1, which is characterized in that the voltage changing module includes the second diode
With the second capacitance；First winding has the current input terminal and current output terminal that sense the electric main after transformation；
The anode of second diode is connected with the current output terminal of first winding, the cathode of second diode with
The first winding output terminal connection；The first end of second capacitance is connected with the cathode of second diode, and described
The second end of two capacitances is connected with the current input terminal of first winding, and the second end of second capacitance is also connected to ground.
7. supply voltage conversion circuit as claimed in claim 3, which is characterized in that the second switch pipe is three pole of NPN type
Pipe；
The input terminal of the second switch pipe is the collector of NPN type triode, and the control terminal of the second switch pipe is NPN type
The base stage of triode, the output terminal of the second switch pipe are the emitter of NPN type triode.
8. supply voltage conversion circuit as claimed in claim 3, which is characterized in that the switch module further includes 3rd resistor
With the 4th resistance；
The control terminal of the second switch pipe is connected with the switch control terminal of the switch module, is specially：
The first end of the 3rd resistor is connected with the switch control terminal of the switch module, the second end of the 3rd resistor with
The control terminal connection of the second switch pipe, the first end of the second end of the 3rd resistor also with the 4th resistance are connected,
The second end of 4th resistance is connected to ground.
9. supply voltage conversion circuit as claimed in claim 2, which is characterized in that the first switch that the switch module includes
Pipe and/or logic unit are integrated in a chip.
10. a kind of LED electric power systems, which is characterized in that including supply voltage conversion circuit and LED illuminating circuits, wherein, it is described
Supply voltage conversion circuit realizes supply voltage conversion circuit as described in any one of claim 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721490456.6U CN207399047U (en) | 2017-11-09 | 2017-11-09 | Supply voltage conversion circuit and L ED power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721490456.6U CN207399047U (en) | 2017-11-09 | 2017-11-09 | Supply voltage conversion circuit and L ED power supply system |
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| CN207399047U true CN207399047U (en) | 2018-05-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114977791A (en) * | 2022-05-06 | 2022-08-30 | 湖北美格新能源科技有限公司 | Solar energy MPPT voltage reduction means |
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2017
- 2017-11-09 CN CN201721490456.6U patent/CN207399047U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114977791A (en) * | 2022-05-06 | 2022-08-30 | 湖北美格新能源科技有限公司 | Solar energy MPPT voltage reduction means |
| CN114977791B (en) * | 2022-05-06 | 2024-02-09 | 湖北美格新能源科技有限公司 | Solar MPPT voltage reduction device |
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