CN208890656U - A kind of hf switching power supply - Google Patents
A kind of hf switching power supply Download PDFInfo
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- CN208890656U CN208890656U CN201821809273.0U CN201821809273U CN208890656U CN 208890656 U CN208890656 U CN 208890656U CN 201821809273 U CN201821809273 U CN 201821809273U CN 208890656 U CN208890656 U CN 208890656U
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Abstract
The utility model belongs to high-frequency switching technology field, discloses a kind of hf switching power supply and is provided with voltage regulator；Voltage regulator is connect by conducting wire with pwm pulse generator by conducting wire and current regulator, current regulator, and pwm pulse generator is connect by conducting wire with driving circuit, and driving circuit is connect by conducting wire with main circuit；Current regulator is connect by conducting wire with current feedback circuit；Voltage regulator is connect by conducting wire with voltage feedback circuit.The utility model can be used for controlling shutdown inverter circuit by setting pwm pulse generator, so that a series of output for the pulse for allowing constant amplitude pulse width not wait replaces sine wave, pwm control circuit can solve the problems, such as to improve two of voltage and waveform simultaneously；By the way that current feedback circuit is arranged, the electric current of output end can be transmitted to current regulator, current signal is compared by voltage regulator, stablize output electric current.
Description
Technical field
The utility model belongs to high-frequency switching technology field more particularly to a kind of hf switching power supply
Background technique
Currently, the prior art commonly used in the trade is such that
The composition of Switching Power Supply mainly utilizes current power electronic technique, along with the conducting of control switch transistor
With the ratio of turn-off time and keep the power supply of stable output voltage.Switching Power Supply essential structure is all by pulsewidth modulation
(PWM) IC and MOSFET composition is controlled.Linear power supply before is at high cost, and output power is low, but Switching Power Supply is just exactly therewith
On the contrary.Power electronic technique is constantly developing and is innovating, and more novel switch power technologies can constantly emerge in large numbers, same with this
Bigger improvement is had certainly on Shi Chengben and output power.
Switching Power Supply was developed to for the 5th generation now.The first generation was started slow by Switching Power Supply at the beginning of the seventies in last century
Slowly instead of linear power supply；The second generation is to have authenticated UL in 1976；The third generation is since last century end Switching Power Supply
It moves towards globalization, generalize, therefore the development of power supply and innovation is not limited in North America.Input voltage must expand consideration
Range 85 is between 265V AC.Furthermore it also obtains and the security regulations in Europe is incorporated wherein.In the forth generation in age in last century,
European Union to proposed on harmonic wave higher Electro Magnetic Compatibility (FMC) and Active PFC (PFC) requirement；It comes into now
5th generation, and in 2006, European Union will execute " limitation electronic product " limitation and " be used in electronic equipment using noxious material
The regulation of certain harmful substances " has been born Switching Power Supply product of new generation in this context.The developing direction of power supply is high-frequency,
Promote Switching Power Supply to minimize, promote the development of high-tech product, to reduce the size and weight of Switching Power Supply, especially in height
Scientific and technological industry.In addition, the development and application of Switching Power Supply is to economizing on resources, energy saving, protection environment is extremely important.
In recent years, Switching Power Supply is in electric power, and communication is medical, and the every field such as traffic are widely used, achieve
Apparent economic benefit.With constantly bringing forth new ideas for switch element and magnetic material performance, switching frequency is gradually increased, and power supply is gradually
Increase, Switching Power Supply performance is also improving.Due to the development of development and the software development of the relevant technologies, the research and development water of Switching Power Supply
It is flat to step up.
In conclusion problem of the existing technology is:
The work that existing high frequency switch power cannot be guaranteed the accuracy of the voltage of output and make its reliable and stable.
Utility model content
In view of the problems of the existing technology, the utility model provides a kind of hf switching power supply.
The utility model is realized in this way a kind of hf switching power supply is provided with voltage regulator, voltage is adjusted
Device is connect by conducting wire with pwm pulse generator by conducting wire and current regulator, current regulator, and pwm pulse generator is logical
It crosses conducting wire to connect with driving circuit, driving circuit is connect by conducting wire with main circuit；
By the way that pwm pulse generator is arranged, it can be used for controlling shutdown inverter circuit, to make a series of constant amplitude pulses wide
The output for the pulse that degree does not wait replaces sine wave, and pwm control circuit can solve the problems, such as to improve two of voltage and waveform simultaneously.
Further, the current regulator is connect by conducting wire with current feedback circuit.
By the way that current feedback circuit is arranged, the electric current of output end can be transmitted to current regulator, be adjusted by voltage
Device is compared current signal, stablizes output electric current.
Further, the voltage regulator is connect by conducting wire with voltage feedback circuit.
By the way that voltage feedback circuit is arranged, the voltage of output end can be transmitted to voltage regulator, be adjusted by voltage
Device is compared voltage signal, adjusts the duty ratio of pwm pulse signal, stabilizes the output voltage.
Detailed description of the invention
Fig. 1 is hf switching power supply schematic diagram provided by the embodiment of the utility model.
Fig. 2 is current rectifying and wave filtering circuit figure provided by the embodiment of the utility model.
Fig. 3 is transformer design parameter figure provided by the embodiment of the utility model.
Fig. 4 is feed circuit figure provided by the embodiment of the utility model.
Fig. 5 is the waveform diagram after rectification provided by the embodiment of the utility model.
Fig. 6 is the simulation waveform of the output of UC3843 outpu pin provided by the embodiment of the utility model.
Fig. 7 is Circuit Fault on Secondary Transformer waveform diagram provided by the embodiment of the utility model.
Fig. 8 is load voltage waveform figure provided by the embodiment of the utility model.
Fig. 9 is the Switching Power Supply schematic diagram provided by the embodiment of the utility model based on UC3843.
In figure: 1, voltage regulator；2, current regulator；3, pwm pulse generator；4, driving circuit；5, main circuit；6,
Voltage feedback circuit；7, current feedback circuit.
Specific embodiment
For the invention, features and effects that can further appreciate that the utility model, the following examples are hereby given, and cooperates
Detailed description are as follows for attached drawing.
As shown in Figure 1, hf switching power supply provided by the embodiment of the utility model includes: voltage regulator 1, electric current
Adjuster 2, pwm pulse generator 3, driving circuit 4, main circuit 5, voltage feedback circuit 6, current feedback circuit 7.
Voltage regulator 1 is connect by conducting wire with current regulator 2, and current regulator 2 is generated by conducting wire and pwm pulse
Device 3 connects, and pwm pulse generator 3 is connect by conducting wire with driving circuit 4, and driving circuit 4 is connect by conducting wire with main circuit 5,
Current feedback circuit 7 is connect by conducting wire with main circuit 5 and current regulator 2, and voltage feedback circuit 6 passes through conducting wire and voltage tune
It saves device 1 to connect, voltage feedback circuit 6 and current feedback circuit 7 form two close cycles.
The working principle of the utility model are as follows:
Voltage feedback circuit 6 and current feedback circuit 7 form two close cycles, control principle are as follows: will by voltage feedback circuit 6
Output voltage U0With given reference voltage UrefIt is compared, the voltage error signal that voltage regulator 1 exports is as electric current tune
Save the voltage reference signal of device 2.To the voltage signal U of reflection switching current variationsSampling comparison is carried out, pwm pulse letter is adjusted
Number duty ratio, stablize output pressure U0。
It is further described below with reference to structure of the embodiment to the utility model.
Embodiment 1
UC3843 control circuit chip is a kind of chip of single output control, and great advantage is that the circuit of chip periphery is external
Element is seldom and the condition of wiring is very simple, and high reliablity is at low cost, and cost performance is high.UC3843 is capable of providing direct inlet wire
Various improvement characteristics needed for fixed frequency Switching Power Supply are good at adjusting load regulation, the limitation of control pulse current and be undertaken
The functions such as power supply output overcurrent protection.
Each pin function difference is as follows:
(1) foot 1 (COMP) main function is as loop compensation；
(2) pin 2 (VFB) is usually connected to the output of Switching Power Supply after connecting a resistance, while being also internal miss
The inverting input terminal of poor amplifier；
(3) pin 3 (ISENSE) utilizes voltage signal of the direct ratio on inductor, and then pulse width modulator can terminate adjusting
The conducting of switch；
(4) pin 4 (RT/CT) is then connected to ground by the way that a resistance R and a capacitor C are connected to pin 8 (Vref),
Reach the adjustment of adjustment oscillator frequency and maximum output duty ratio, the chip maximum operating frequency is up to 500kHz；
(5) pin 5 (GND) pin be control circuit and power supply publicly；
(6) the pulse output that pin 6 (OUTPUT) generates, drives MOSFET, the driving capability with 1A；
(7) pin 7 (VCC) is power supply terminal, and the threshold voltage for opening work is 16V, turns off the minimum work electricity of work
Pressure is 10V:
(8) pin 8 (VREF) provides the reference voltage of 5V and the bearing capacity of 50mA, provides charging current and passes through oscillation electricity
Hinder the capacitor of device.
The starting and normal work of UC3843
It is learnt by chip handbook, the starting voltage of UC3843 is 16V, and closing threshold value is 10V.When VCC pin voltage is big
Chip starts work when 16V, while transformer secondary output feed winding inductive output voltage after system is gradually stable is given
UC3843 power supply guarantees that chip works normally, so the capacitance resistance on the 7th foot periphery needs just to select after consideration, together
When must pay attention to the control of voltage at the 7th foot inside UC3843, in order to avoid voltage is excessive to lead to burning for chip, it is contemplated that this reason
The driving of the Switching Power Supply of the utility model design of Simulation, chip is directly driven using the DC power supply of 17V.
Embodiment 2
Input voltage is generally the industrial-frequency alternating current of the 220V of 50Hz, and undertake rectifying part is all usually high pressure PiN
Diode, so the conduction loss of diode is main loss.The forward voltage drop of diode and the product of Mean Forward Current
Equal to conduction loss, in AC sine input and the application of full-bridge rectification.
Required diode maximal integer mass flow electric current, which is theoretically calculated, need to only be greater than 75mA.The diode generally selected is
Rated current is much larger than the diode for calculating obtained maximum average current.Another important parameter of rectifier diode is most
Big working inverse voltage, in bridge rectifier, inverse peak voltage, that is, alternating current that diode is born inputs ceiling voltage.Input voltage
Shown in rectifying and wave-filtering Fig. 2.
Embodiment 3
Transformer winding in single-end flyback converters circuit
Emphasis in the design of transformer switch power supply, it is each to will lead to entire power supply for the setting of various parameters in transformer
Aspect changes, thus in the setting of the parameter of transformer careful consideration.It is one that inverse excitation type converter serves as in fact
Coupling inductance mainly transmits current signal, therefore the turn ratio and output voltage can't influence each other.
It is the selected major parameter of this paper design of Simulation such as Fig. 3 transformer design parameter figure.
Embodiment 4
Feed circuit
The main part of feed circuit is voltage regulator TL431 (reference voltage of TL431 is 2.5V) and linear photoconductor
Coupler U4n24.Error voltage amplifier is undertaken by TL431 voltage-stablizer, is adjusted and is exported by linear optocoupler.Such as Fig. 4 institute
Show, two resistance connected outside voltage-stablizer, for controlling output voltage.When the output voltage increases, sampled voltage increases, setting
Voltage is greater than reference voltage 2.5V, this can allow the output voltage in TL431 to become larger, this can allow the output of UC3843 connection triode
Voltage becomes smaller, and output voltage V0 decline finally allows V0 gradually stable.Conversely speaking, when output voltage decline causes that voltage is arranged
Decline, when output voltage is lower than setting voltage, the output voltage decline of error amplifier, the triode being connect with UC3843
Output voltage can become larger, and change the compensation input current of the foot 1 of UC3843 therewith, then at this moment in UC3843
PWM comparator will do it adjusting, changes duty ratio, achievees the purpose that stable.
The structure of the utility model is further described below with reference to simulation result and waveform analysis.
The whole system artificial circuit figure of Switching Power Supply, builds the model using Saber simulation software, is debugged, obtained
Simulation result out.
1, the waveform after rectifying
If Fig. 5 transformer input waveform figure is exactly the input voltage waveform of the novel simulated middle transformer primary side of this reality.From figure
In be not difficult to obtain DC voltage that the voltage after rectification is 216.79V or so, virtual value is 198.69V as shown in the figure.
2, what UC3843 was generated is used to control the PWM wave that MOSFET is turned on and off
Metal-oxide-semiconductor is effectively driven as shown in fig. 6, observing the waveform and can seem the PWM wave that chip UC3843 is generated
Work, while the size of current that also can detecte the resistance at its current sampling end adjusts its output, to guarantee whole
Body stablizes output.Its frequency is in 95kHZ known to from the waveform.
3, transformer secondary side waveform
Such as Fig. 7 Circuit Fault on Secondary Transformer waveform diagram, its frequency known to observation is 95kHZ or so, virtual value 24.764V.
4, the voltage waveform loaded
If Fig. 8 figure load voltage waveform figure show that simulation result designed by this paper is, the DC voltage-stabilizing of 12V is exported.
The above is only the preferred embodiment to the utility model, is not made in any form to the utility model
Limitation, it is all according to the technical essence of the utility model any simple modification made to the above embodiment, equivalent variations with
Modification, is all within the scope of the technical scheme of the utility model.
Claims (3)
1. a kind of hf switching power supply, which is characterized in that the hf switching power supply is provided with
Voltage regulator；
Voltage regulator is connect by conducting wire with pwm pulse generator by conducting wire and current regulator, current regulator, PWM
Impulse generator is connect by conducting wire with driving circuit, and driving circuit is connect by conducting wire with main circuit.
2. hf switching power supply as described in claim 1, which is characterized in that the current regulator passes through conducting wire and electricity
Current feedback circuit connection.
3. hf switching power supply as described in claim 1, which is characterized in that the voltage regulator passes through conducting wire and electricity
Press feed circuit connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821809273.0U CN208890656U (en) | 2018-10-25 | 2018-10-25 | A kind of hf switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821809273.0U CN208890656U (en) | 2018-10-25 | 2018-10-25 | A kind of hf switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208890656U true CN208890656U (en) | 2019-05-21 |
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ID=66517819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821809273.0U Expired - Fee Related CN208890656U (en) | 2018-10-25 | 2018-10-25 | A kind of hf switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208890656U (en) |
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2018
- 2018-10-25 CN CN201821809273.0U patent/CN208890656U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190521 Termination date: 20191025 |
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| CF01 | Termination of patent right due to non-payment of annual fee |