CN107272799A - A kind of low-voltage wideband power supply - Google Patents
A kind of low-voltage wideband power supply Download PDFInfo
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- CN107272799A CN107272799A CN201710360935.4A CN201710360935A CN107272799A CN 107272799 A CN107272799 A CN 107272799A CN 201710360935 A CN201710360935 A CN 201710360935A CN 107272799 A CN107272799 A CN 107272799A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
Abstract
Filtered out and anti-jamming circuit the invention provides a kind of low-voltage wideband power supply, including clutter, the first rectification circuit, voltage conversion circuit, mu balanced circuit, negative feedback voltage detection circuit and negative-feedback compensation circuit, the negative-feedback compensation circuit are realized using the pulse width modulation mode of current control.The presence that this programme can effectively solve current Switching Power Supply is complicated, and appearance and size, interface disunity, and the stability of a system are poor, easy out of order problem.The present invention is widely used, and is particularly suitable for use in the power supply of underground coal mine midget plant.
Description
Technical field
The present invention relates to a kind of electric supply installation, more particularly to a kind of low pressure wide-band switching power supply for providing multiple voltage supply
Device, belongs to electrical equipment and electrical engineering field.
Background technology
Switching Power Supply is to utilize modern power electronics technology, the time ratio that controlling switch pipe is turned on and off, and remains steady
Determine a kind of power supply of output voltage, Switching Power Supply is typically made up of pulse width modulation (PWM) control IC and MOSFET.Switch electricity
Product-derived is widely used in industrial automatic control, military industry equipment, research equipment, LED illumination, industrial control equipment, communication apparatus, electricity
Power equipment, instrument and meter, Medical Devices, semiconductor refrigerating such as heat at the field.
At present, in the market circulates various types of Switching Power Supplies, and conventional Switching Power Supply type has buck switch electricity
Source, booster switcher power supply, semi-bridge switching voltage regulator, full-bridge type Switching Power Supply, inverse-excitation type switch power-supply, positive activation type Switching Power Supply
Benefit structure of opening up Deng, these power supplys substantially inputs surge and overvoltage protection, EMC, EMI, bridge rectifier, filtering energy storage electricity
Road, switch mosfet module, PWM controls, high frequency transformer, rectifying and wave-filtering output circuit.
But, complicated, appearance and size, interface disunity etc. of current Switching Power Supply generally existing power supply adaptor
Problem, causes the stability of a system poor, is easily out of order.
The content of the invention
In order to solve problem above present in prior art and other problemses, the invention provides a kind of new low
Wideband power supply circuit, including clutter is pressed to filter out and anti-jamming circuit, the first rectification circuit, voltage conversion circuit, mu balanced circuit is born
Feedback voltage detects circuit and negative-feedback compensation circuit, and the negative-feedback compensation circuit uses the pulse width modulation mode of current control
Realize.
Further, the negative-feedback compensation circuit includes UC3842 integrated chips, and UC3842 working power is by institute
The offer of first rectification circuit is provided.
Further, first rectification circuit is whole by current-limiting circuit current limliting and second before being powered to UC3842
Current circuit rectification.
Further, the negative feedback voltage detection circuit will detect negative including optic coupling element P1 and P2, P1 and P2
Feedback signal is output to the output end of UC3842 error amplifier.
Further, the high frequency low voltage signal of described voltage conversion circuit output is through the 3rd rectification circuit and filtered electrical
Rood exports DC voltage to first.
Further, the first described output DC voltage is+12V.
Further, the first described output DC voltage passes through mu balanced circuit, obtains the second output DC voltage.
Further, the second described output DC voltage is+5V.
Further, described mu balanced circuit includes circuit of three-terminal voltage-stabilizing integrated U1 (LM7805).
The presence that above-mentioned technical proposal can effectively solve current Switching Power Supply is complicated, and appearance and size, interface are not united
One, and the stability of a system is poor, easy out of order problem.
Brief description of the drawings
Fig. 1 is an embodiment of low pressure wideband power supply provided by the present invention.
Fig. 2 is filtered out and anti-jamming circuit for clutter in above-mentioned embodiment.
Fig. 3 is the current control mode pulse width modulator integration module UC3842 used in above-mentioned embodiment internal circuit
Structure chart.
Brief description of the drawings：
1- clutters are filtered out and anti-jamming circuit；The rectification circuits of 2- first；3- voltage conversion circuits；4- mu balanced circuits；5- is born
Feedback voltage observation circuit；6- negative-feedback compensation circuits；7- current-limiting circuits；The rectification circuits of 8- second；The rectification circuits of 9- the 3rd；
10- filter circuits.
Embodiment
To make technical scheme clearer, below in conjunction with the accompanying drawings and specific embodiment the present invention is carried out it is detailed
Explanation.
Concrete scheme is as shown in figure 1, alternating current 220V (85~265V) power supply enters through protective tube F (250V/0.5A) first
Clutter is constituted by CX1, L1, CY1, CY2, CX2 etc. to filter out and anti-jamming circuit 1 (Fig. 2), can be obtained cleaner 50Hz and be handed over
Voltage is flowed, through first rectification circuit 2 (DB1) rectification, about+300V DC voltage is obtained.The DC voltage is through voltage conversion electricity
After road 3 (switch transformer T1) primary side, FET source electrode VT1 (K3324) power-up is given.While the first rectification circuit 2 (DB1)
+ 300V the voltages exported provide necessary working power through R15 to UC3842 7 pin.(the switch transformer of voltage conversion circuit 3
T1 another winding of primary side) provides a basic boost voltage, by current-limiting circuit 7 (R18, R19) current limliting, second
Rectification circuit 8 (VD3) rectification is supplied to the feeder ear (IC1 7 pin) of negative-feedback compensation circuit 6.
Voltage conversion circuit 3 (switch transformer T1) is both indispensable element in circuit, while being isolation element again.
The high frequency low voltage of the secondary side output of+300V DC voltage through voltage conversion circuit 3 (switch transformer T1) is whole through the 3rd
Current circuit 9 (D7) rectification can obtain all-wave pulsating volage, and filtered circuit 10 (C16, C17, C18, C19) filtering can obtain non-
First often stable output DC voltage (+12V) voltage.Then (the circuit of three-terminal voltage-stabilizing integrated of mu balanced circuit 4 is accessed by L2
U1 (LM7805)) it can both obtain the first output DC voltage (+5V).
Present embodiment also includes negative feedback voltage observation circuit 5 (optocoupler P1, P2), for detecting and feeding back output electricity
Pressure.Negative feedback voltage observation circuit 5 (optocoupler P1, P2), which will detect to flow, timely feeds back to negative-feedback compensation circuit 6
(UC3842 1 pin), can obtain it is optimal can flow compensation, whole circuit is obtained good control, thus make output voltage steady
It is scheduled on optimum Working.
To strengthen stability, adaptability and the reliability of whole system, Switching Power Supply of the invention employs closed-loop path
System, the circuit of charge control switch pipe obtains feedback signal from the output of power supply, then increased according to the power consumption of load or
Person reduces the frequency of the voltage in a certain cycle.
In order to realize the electric property of whole system and the best of breed of cost, the low-voltage wideband power supply that the present invention is provided
Circuit employs UC3842 integrated chips, and its maximum feature is exactly to solve optimal electric property and minimum cost.
The negative-feedback compensation circuit that the present embodiment is used includes UC3842 integrated chips.UC3842 is a integrated electric current
Control type pulse width modulator (PWM), all properties advantage of current mode operation can be obtained by means of the controller, typical steady
In voltage source work, clock signal is to carry out startup power supply pulse with a fixed frequency and work, from line voltage
Just, the error signal presented can directly control pulse width, it is not necessary to consider the electric current of inductance.
The UC3842 integrated chips that the present embodiment is used are a kind of high-performance Single-end output formula current-control type pulsewidth modulations
Device chip, can directly drive bipolar transistor, MOSFEF and IGBT constant power type semiconductor devices, with number of pin it is few,
Peripheral circuit is simple, installation and debugging are easy, function admirable many advantages, such as, be widely used in the systems such as computer, display electricity
Lu Zhongzuo Switching Power Supply driving elements.Its internal result is as shown in Figure 3.UC3842 is controllable using fixed working frequency pulse width
Modulation system, has 8 pins, and each pin function is as follows：
1 pin is the output end of error amplifier, and external resistor and capacitor component is used for the gain for improving error amplifier and frequency is special
Property；2 pin are feedback voltage inputs, and the 2.5V reference voltages of this pin voltage and error amplifier in-phase end are compared, and are produced
Error voltage, so as to control pulse width；3 pin are current sense input, and pulse width is reduced when detecting voltage more than 1V
Power supply is set to be in discontinuous operation state；4 pin are timing end, and the working frequency of internal oscillator is determined by external capacity-resistance time constant
It is fixed, f=1.72/ (RT × CT)；5 pin are common；6 pin are recommending output mode end, and inside is totem pillar, when rising, declining
Between be only 50ns driving forces be ± 1A；7 pin are dc source feeder ears, and with deficient, over-voltage locking function, chip power-consumption is
15mW；8 pin are 5V reference voltage output ends, there is 50mA load capacity.
The modulator Single-end output, can directly drive ambipolar power tube or FET.Its major advantage is its pipe
Pin effect is few, and peripheral circuit is simple, and voltage regulation factor is up to 0.01%, and working frequency is up to 500KHz, and starting current is less than
1mA, running current is 5mA, and realizes and isolate with power network using high frequency transformer.Integrated chip oscillator,
High-gain error amplifier, current sense comparator, totem output current, input and benchmark under-voltage with high temperature compensation
Lock-in circuit and PWM latch circuit.
1 pin of UC3842 integrated chips is error amplifier output；2 pin are feedback voltage inputs, this pin voltage with
The 2.5V reference voltages of error amplifier in-phase end are compared, and error voltage are produced, so as to control pulse width.3 pin are inspections
Current input terminal is surveyed, pulse width is reduced when monitoring voltage is more than 1V makes power supply be in discontinuous operation state, and its control has
The peripheral cells such as VT2V, T3, C10, C12, C7, R23, R24, R25, R26 are constituted；4 pin are timing end, the work of internal oscillator
Working frequency has the time constant of the elements such as C8, C9, R23 to determine.6 pin are that recommending output mode controls VT1, are operated on off state；8
Pin is 5V reference voltage output ends, is that detection and compensation circuit provide necessary energy stream.
The high frequency switch power new technology that power module in the embodiment of the present invention is employed, it is possible to achieve one kind input electricity
Feedback characteristics before pressure, control circuit can correct input voltage deviation at once.Can be remarkably by the regulation of error amplifier
Complete the stable output of voltage.The appropriate peripheral cell for changing UC3842 integrated packages, can very easily adjust input voltage model
The bandwidth enclosed, its supply voltage stable between 85V~265V can be operated on the magnitude of voltage of setting, can flexibly be applied
In coal mine ground and the small electronic device of underground.
The low-voltage wideband power supply circuit that the present invention is provided, simple in construction, working efficiency is higher, safety and reliability, can be with
The power supply adaptor of various equal grades is substituted completely, is solved the appearance and size of each equipment manufacturer's power supply adaptor, interface and is not united
One the problems such as, trouble point is reduced, improve information system stability.
The low-voltage wideband power supply circuit that the present invention is provided adapts to the small-sized attached equipment of a variety of equal voltage class
Power reguirements, the power supply for being more suitable for underground coal mine midget plant of Switching Power Supply.By the experiment of nearly half a year, have been widely used
In the upper and lower wireless communication system of coal mine, voice broadcast service system, closed-circuit TV system, fingerprint attendance system, fiber-optic monitoring system
System, liquid crystal display power supply are remedied etc. in plurality of devices, the reliability service as power supply adaptor.Equipment has effectively subtracted since running
The stock for being equipped with different electrical power adapter is lacked, has improved maintenance efficiency, reduce system failure point, ensured that equipment is reliably transported
OK.More than 300,000 yuan of fund is saved for Coal Seam in Xinglongzhuang Mine.
The invention is not limited in the embodiment having been described above, to those skilled in the art, in the model of the present invention
Enclosing interior obviously can have various improvement.
Claims (9)
1. a kind of low-voltage wideband power supply, including clutter are filtered out and anti-jamming circuit, the first rectification circuit, voltage conversion circuit,
Mu balanced circuit, negative feedback voltage detection circuit and negative-feedback compensation circuit, it is characterised in that the negative-feedback compensation circuit is used
The pulse width modulation mode of current control is realized.
2. low-voltage wideband power supply according to claim 1, it is characterised in that the negative-feedback compensation circuit includes
UC3842 integrated chips, UC3842 working power is provided by first rectification circuit.
3. low-voltage wideband power supply according to claim 2, it is characterised in that first rectification circuit is to UC3842
Before power supply, by current-limiting circuit current limliting and the second rectifier circuit rectifies.
4. low-voltage wideband power supply according to claim 2, it is characterised in that the negative feedback voltage detection circuit includes
Optic coupling element P1 and P2, optic coupling element P1 and P2 will detect the output that negative-feedback signal is output to UC3842 error amplifier
End.
5. low-voltage wideband power supply according to claim 1, it is characterised in that the height of described voltage conversion circuit output
Frequency low-voltage signal obtains the first output DC voltage through the 3rd rectification circuit and filter circuit.
6. low-voltage wideband power supply according to claim 5, it is characterised in that the first described output DC voltage for+
12V。
7. low-voltage wideband power supply according to claim 5, it is characterised in that the first described output DC voltage passes through
Mu balanced circuit, obtains the second output DC voltage.
8. low-voltage wideband power supply according to claim 6, it is characterised in that the second described output DC voltage for+
5V。
9. low-voltage wideband power supply according to claim 7, it is characterised in that described mu balanced circuit includes three-terminal voltage-stabilizing
Integrated circuit U1 (LM7805).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710360935.4A CN107272799A (en) | 2017-05-22 | 2017-05-22 | A kind of low-voltage wideband power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710360935.4A CN107272799A (en) | 2017-05-22 | 2017-05-22 | A kind of low-voltage wideband power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107272799A true CN107272799A (en) | 2017-10-20 |
Family
ID=60064078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710360935.4A Pending CN107272799A (en) | 2017-05-22 | 2017-05-22 | A kind of low-voltage wideband power supply |
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| Country | Link |
|---|---|
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5563776A (en) * | 1994-03-14 | 1996-10-08 | Ecktronics Corp. | Switching-mode, alternating current, wave replication system |
| CN102664528A (en) * | 2012-04-23 | 2012-09-12 | 承德承信自动化工程有限公司 | Switch power supply |
| CN203243226U (en) * | 2013-04-11 | 2013-10-16 | 杭州海兴电力科技股份有限公司 | Switch power source |
| CN203827167U (en) * | 2014-03-13 | 2014-09-10 | 昂宝电子（上海）有限公司 | Novel output voltage and current-variable switching power source circuit |
-
2017
- 2017-05-22 CN CN201710360935.4A patent/CN107272799A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5563776A (en) * | 1994-03-14 | 1996-10-08 | Ecktronics Corp. | Switching-mode, alternating current, wave replication system |
| CN102664528A (en) * | 2012-04-23 | 2012-09-12 | 承德承信自动化工程有限公司 | Switch power supply |
| CN203243226U (en) * | 2013-04-11 | 2013-10-16 | 杭州海兴电力科技股份有限公司 | Switch power source |
| CN203827167U (en) * | 2014-03-13 | 2014-09-10 | 昂宝电子（上海）有限公司 | Novel output voltage and current-variable switching power source circuit |
Non-Patent Citations (1)
| Title |
|---|
| 衡耀付，陈富军: "一种基于UC3842的新型开关稳压电源设计", 《电力自动化设备》 * |
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Application publication date: 20171020 |