CN207251476U - Flyback sourse preloading device - Google Patents
Flyback sourse preloading device Download PDFInfo
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- CN207251476U CN207251476U CN201721012799.1U CN201721012799U CN207251476U CN 207251476 U CN207251476 U CN 207251476U CN 201721012799 U CN201721012799 U CN 201721012799U CN 207251476 U CN207251476 U CN 207251476U
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Abstract
Flyback sourse preloading device, including housing, input filter, power converter, output rectifier, output filter, PWM controller and isolation ultramagnifier and preload controller, input filter, power converter, output rectifier, output filter, PWM controller and isolation ultramagnifier and preload controller are installed in the housing.The beneficial effects of the utility model are：Increase extra rectification circuit, bleeder circuit and PNP triode in transformer secondary side, by diode rectification, electric resistance partial pressure, the voltage with transformer change in duty cycle is produced in transistor base；When transformer duty cycle is small, electric power output voltage is higher than transistor base voltage, and triode ON, power supply output preload circuit turn-on, makes output voltage stabilization；When transformer duty cycle is big, electric power output voltage is less than transistor base voltage, triode shut-off, and preload circuit disconnects, and reduces power supply power consumption and improves efficiency.
Description
Technical field
It the utility model is related to a kind of flyback sourse preloading device.
Background technology
Flyback sourse is substantially by input filter circuit, pulsewidth modulation or Frequency-variable Modulation circuit, power transformer, output at present
Current rectifying and wave filtering circuit and separation feedback control circuit are formed.Flyback sourse voltage is required for certain stability requirement, and flyback
For power supply when unloaded or load is smaller since electric current is discontinuous, its output voltage is unstable, is generally all fixed using output increase
Preload is stablized output voltage.When power supply works normally, increased preload circuit can produce a large amount of power consumptions of increase and
Waste heat, reduces the efficiency index of device.
The content of the invention
To solve the above-mentioned problems, the utility model proposes a kind of monitoring by output duty cycle, when power supply accounts for
It is automatic to disconnect output preload circuit when sky is than reaching a certain level, reach and reduce power consumption and heat, improve power-efficient, and
And make to keep stable flyback sourse preloading device when output voltage is unloaded or load is smaller.
Flyback sourse preloading device described in the utility model, it is characterised in that：Including housing, input filter module,
Power conversion module, output rectification module, output filter module, PWM control modules and isolation feedback module and preload control
Molding block, the input filter module, power conversion module, output rectification module, output filter module, PWM control modules with
And isolation feedback module and preload control module are installed in the housing, the housing, which is equipped with, to be used to draw flyback electricity
The output plughole of the input jack of the voltage input end in source and the voltage output end for drawing flyback sourse；The input filter
The input terminal of ripple module as flyback sourse voltage input end after the input jack of housing is drawn, with externally fed power supply electricity
Even；The output terminal of the input filter module and the signal input part of the power conversion module are electrically connected, the power modulus of conversion
First output terminal of block and the input terminal of the PWM control modules are electrically connected, and the output terminal of the PWM control modules is isolated with described
The input terminal of feedback module is electrically connected, the output terminal of the isolation feedback module and the first input end electricity of the output filter module
Even；Second output terminal of the power conversion module and the input terminal of transformer are electrically connected, the output terminal of the transformer with it is described
The first input end of output rectification module is electrically connected, the second input terminal of the output rectification module and the preload control module
Output terminal be electrically connected, it is described output rectification module output terminal and the second input terminal of the output filter module be electrically connected；It is described
The output terminal of output filter module as flyback sourse voltage output end after the output plughole of housing is drawn, with exterior electricity consumption
Equipment is electrically connected.
The output rectification module includes diode, the PNP triode for control circuit break-make, first resistor, second
Resistance, 3rd resistor, capacitance and adjustment resistance, the transformer, diode, first resistor and second resistance by conducting wire successively
The rectification circuit of closure is connected into, the wherein cathode of diode and the output terminal of transformer is electrically connected, the anode of diode and first
Resistance is electrically connected；The capacitance is in parallel with second resistance, and the first end of wherein capacitance is connected with 3rd resistor, and the second end of capacitance is made
It is electrically connected for the voltage output end and external electric equipment of flyback sourse；The 3rd resistor, PNP triode and adjustment resistance lead to
Cross conducting wire to connect to form bleeder circuit, wherein the base stage (i.e. B poles) of PNP triode is electrically connected circuit with the 3rd, the collection of PNP triode
Electrode (i.e. C poles) and the output terminal of preload control module are electrically connected, emitter (i.e. E poles) and the adjustment resistance string of PNP triode
The second end that capacitance is incorporated to after connection is electrically connected.
The adjustment resistance includes the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance, wherein the 4th electricity
Resistance, the 5th resistance, the 6th resistance and the 7th resistance pass through corresponding conductor in parallel.
The housing is regular hexahedron metal-back, and input jack and output plughole are arranged to dual-in-line jack, i.e., described
The voltage input end and voltage output end of flyback sourse are the dual-in-line pin for external connection.
The housing is equipped with 8 lead ports, is respectively output plus terminal, output ground, two dead ends, forbids holding, inputs
Anode, input ground and shell.
Technical solution is used by the utility model solves its technical problem：Increase extra rectification in transformer secondary side
The PNP triode of circuit, bleeder circuit and controllable turn-on and turn-off.By diode rectification, electric resistance partial pressure, in triode base
Pole produces the voltage with transformer change in duty cycle, transistor emitter connection power supply output.When transformer duty cycle is small
When, electric power output voltage is higher than transistor base voltage, triode ON, power supply output preload circuit turn-on, so that defeated
Go out voltage stabilization.When transformer duty cycle is big, electric power output voltage is less than transistor base voltage, and triode shut-off is pre- negative
Carry circuit to disconnect, reduce power supply power consumption and improve efficiency.
The beneficial effects of the utility model are：By increasing flyback sourse controllable preload circuit, reach reduction work(
Consumption and heat, improve power-efficient, and make to keep stable device when output voltage is unloaded or load is smaller.Exported in power supply
End increases controllable PNP triode and realizes that preload circuit is controllable, makes voltage stabilization when power supply is unloaded or load is smaller.
Brief description of the drawings
Fig. 1 is internal module connection diagram (the wherein V of the utility modelinRepresent the voltage input end of flyback sourse；
VoutRepresent the voltage output end of flyback sourse).
Fig. 2 is the output rectification module structure chart (V of the utility modelo +Represent the voltage input end of bleeder circuit；Vo -Generation
The voltage output end of table bleeder circuit).
(abscissa is the time to the voltage oscillogram of triode B, E poles, per lattice 4us when Fig. 3 is duty cycle 5%；Ordinate is
Voltage, per lattice 2V).
(abscissa is the time to the voltage oscillogram of PNP triode B, E pole, per lattice 4us when Fig. 4 is duty cycle 30%；It is vertical to sit
Voltage is designated as, per lattice 2V).
Fig. 5 is the pin schematic diagram of the housing of the utility model.
Fig. 6 is the structure chart of the utility model.
Embodiment
The utility model is further illustrated below in conjunction with the accompanying drawings, referring to the drawings：
The flyback sourse preloading device described in the utility model of embodiment 1, including housing 8, input filter module 1, work(
Rate modular converter 2, output rectification module 3, output filter module 4, PWM control modules 5 and isolation feedback module 6 and pre- negative
Carry control module 7, the input filter module 1, power conversion module 2, output rectification module 3, output filter module 4, PWM
Control module 5 and isolation feedback module 6 and preload control module 7 are installed in the housing, and the housing is equipped with
Output for the input jack and the voltage output end for drawing flyback sourse of the voltage input end of drawing flyback sourse
Jack；The input terminal of the input filter module as flyback sourse voltage input end after the input jack of housing is drawn,
It is electrically connected with externally fed power supply；The signal input part electricity of the output terminal of the input filter module and the power conversion module
Even, the first output terminal of the power conversion module and the input terminal of the PWM control modules are electrically connected, the PWM control modules
Output terminal be electrically connected with the input terminal for isolating feedback module, it is described isolation feedback module output terminal with it is described output filter
The first input end of module is electrically connected；Second output terminal of the power conversion module and the input terminal of transformer are electrically connected, the change
The output terminal of depressor and it is described output rectification module first input end be electrically connected, it is described output rectification module the second input terminal with
The output terminal of the preload control module is electrically connected, and the of output terminal and the output filter module of the output rectification module
Two input terminals are electrically connected；The output terminal of the output filter module as flyback sourse voltage output end from the output plughole of housing
After extraction, it is electrically connected with external electric equipment.
The output rectification module 3 includes diode D1, the PNP triodes Q1 for control circuit break-make, first resistor
R1, second resistance R2,3rd resistor R3, capacitance C1 and adjustment resistance, the transformer T1, diode D1, first resistor R1 and
Second resistance R2 is sequentially connected in series into the rectification circuit of closure by conducting wire, and wherein the cathode of diode R1 and transformer T1's is defeated
Outlet is electrically connected, and anode and the first resistor R1 of diode D1 are electrically connected；The capacitance C1 is in parallel with second resistance R2, wherein capacitance C1
First end connect with 3rd resistor R3, the voltage output end V of the second end of capacitance C1 as flyback sourseoutWith exterior electricity consumption
Equipment is electrically connected；The 3rd resistor R3, PNP triode Q1 and adjustment resistance connect to form bleeder circuit by conducting wire, wherein
The base stage B and 3rd resistor R3 of PNP triode Q1 is electrically connected, and the collector C of PNP triode Q1 is defeated with preload control module 7
Outlet is electrically connected, and the emitter E of PNP triode Q1 is incorporated to capacitance C1 with adjusting second end after resistance is connected is electrically connected.
The adjustment resistance includes the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7, wherein described
4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 pass through corresponding conductor in parallel.
The housing 8 is regular hexahedron metal-back, and input jack and output plughole are arranged to dual-in-line jack, i.e., described
The voltage input end and voltage output end of flyback sourse are the dual-in-line pin for external connection.
In Fig. 1, input filter module will input 28V voltage filters to embodiment 2, pass through power conversion module and transformer
T1 isolation conversion and the voltage through exporting rectification module output corresponding requirements, isolate feedback module and are adjusted by monitoring output voltage
The duty cycle of PWM control modules makes output voltage keep stablizing.Preload control module is controlled according to the size of output duty cycle
The conducting and shut-off of preload switch (Q1 in Fig. 2), voltage keeps stablizing when realizing power supply zero load, reduces electricity when loading larger
The effect of source power consumption.
In fig. 2, the output waveform of transformer T1 is through diode D1 rectifications and first resistor R1, second resistance R2 partial pressures
A DC voltage V changed with transformer T1 output duty cycles is produced in the base stage B of PNP triode Q1b.Work as VoWith VbPressure
When difference is more than the conducting voltage of PNP triode Q1, PNP triode Q1 conductings, the work of preload module.Work as VoWith VbPressure difference it is small
When the conducting voltage of PNP triode Q1, PNP triode Q1 shut-offs, preload module disconnects.
In figure 3, power supply duty cycle is the output voltage waveforms that 5%, a is flyback sourse, and b is the electricity of transistor base
Corrugating.Since both voltage differences are more than PNP triode Q1 conducting voltages, preload module is in running order.
In Fig. 4, power supply duty cycle is the output voltage waveforms that 30%, a is flyback sourse, and b is transistor base voltage wave
Shape.Since both voltage differences are less than PNP triode Q1 conducting voltages, preload module is off.Set on the housing
Have 8 lead ports, be respectively output plus terminal 81, output ground 82, two dead ends (83,84), forbid end 85, input positive terminal 86,
Input ground 87 and shell 88.
Table 1 is the definition of circuit output pin
Content described in this specification embodiment is only enumerating to the way of realization of utility model design, this practicality is new
The protection domain of type is not construed as being only limitted to the concrete form that embodiment is stated, the scope of protection of the utility model is also wrapped
Include those skilled in the art according to the utility model design it is conceivable that equivalent technologies mean.
Claims (4)
1. flyback sourse preloading device, it is characterised in that：Including housing, input filter, power converter, output rectification
Device, output filter, PWM controller and isolation ultramagnifier and preload controller, the input filter, power conversion
Device, output rectifier, output filter, PWM controller and isolation ultramagnifier and preload controller are installed in the shell
In vivo, the housing is equipped with the input jack for the voltage input end for being used to draw flyback sourse and for drawing flyback sourse
Voltage output end output plughole；The input terminal of the input filter as flyback sourse voltage input end from housing
After input jack is drawn, it is electrically connected with externally fed power supply；The letter of the output terminal of the input filter and the power converter
Number input terminal is electrically connected, and the first output terminal and the input terminal of the PWM controller of the power converter are electrically connected, the PWM controls
The output terminal of device processed is electrically connected with the input terminal for isolating ultramagnifier, and output terminal and the output of the isolation ultramagnifier filter
The first input end of device is electrically connected；Second output terminal of the power converter and the input terminal of transformer are electrically connected, the transformer
The first input end of output terminal and the output rectifier be electrically connected, the second input terminal of the output rectifier with it is described pre- negative
The output terminal of set controller is electrically connected, and the output terminal of the output rectifier and the second input terminal of the output filter are electrically connected；
The output terminal of the output filter as flyback sourse voltage output end after the output plughole of housing is drawn, used with outside
Electric equipment is electrically connected.
2. flyback sourse preloading device as claimed in claim 1, it is characterised in that：The output rectifier includes two poles
Pipe, the PNP triode for control circuit break-make, first resistor, second resistance, 3rd resistor, capacitance and adjustment resistance, it is described
Transformer, diode, first resistor and second resistance be sequentially connected in series into the rectification circuit of closure by conducting wire, wherein diode
The output terminal of cathode and transformer is electrically connected, and anode and the first resistor of diode are electrically connected；The capacitance is in parallel with second resistance, its
The first end of middle capacitance is connected with 3rd resistor, and the second end of capacitance is set as the voltage output end of flyback sourse with exterior electricity consumption
It is standby to be electrically connected；The 3rd resistor, PNP triode and adjustment resistance connect to form bleeder circuit by conducting wire, wherein tri- poles of PNP
The base stage of pipe is electrically connected circuit with the 3rd, and the output terminal of the collector and preload controller of PNP triode is electrically connected, PNP triode
Emitter connect with adjustment resistance after be incorporated to the second end of capacitance and be electrically connected.
3. flyback sourse preloading device as claimed in claim 2, it is characterised in that：The adjustment resistance includes the 4th electricity
Resistance, the 5th resistance, the 6th resistance and the 7th resistance, wherein the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance lead to
Cross corresponding conductor in parallel.
4. flyback sourse preloading device as claimed in claim 1, it is characterised in that：The housing is regular hexahedron metal
Shell, input jack and output plughole are arranged to dual-in-line jack, i.e., the voltage input end and voltage output of described flyback sourse
Hold as the dual-in-line pin for external connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721012799.1U CN207251476U (en) | 2017-08-14 | 2017-08-14 | Flyback sourse preloading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721012799.1U CN207251476U (en) | 2017-08-14 | 2017-08-14 | Flyback sourse preloading device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207251476U true CN207251476U (en) | 2018-04-17 |
Family
ID=61881210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721012799.1U Expired - Fee Related CN207251476U (en) | 2017-08-14 | 2017-08-14 | Flyback sourse preloading device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207251476U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425724A (en) * | 2017-08-14 | 2017-12-01 | 杭州可靠性仪器厂 | Flyback sourse preloading device |
-
2017
- 2017-08-14 CN CN201721012799.1U patent/CN207251476U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425724A (en) * | 2017-08-14 | 2017-12-01 | 杭州可靠性仪器厂 | Flyback sourse preloading device |
| CN107425724B (en) * | 2017-08-14 | 2023-09-01 | 浙江杭可仪器有限公司 | Flyback power supply preloading device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180417 |