CN208638251U - A kind of double feedback switch multiple power supplies circuits - Google Patents
A kind of double feedback switch multiple power supplies circuits Download PDFInfo
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- CN208638251U CN208638251U CN201820953388.0U CN201820953388U CN208638251U CN 208638251 U CN208638251 U CN 208638251U CN 201820953388 U CN201820953388 U CN 201820953388U CN 208638251 U CN208638251 U CN 208638251U
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Abstract
The utility model discloses a kind of double feedback switch multiple power supplies circuits: the input terminal of PWM drive circuit connects the 3rd pin of integrated opto-coupler chip U2, the both ends of current-limiting resistance R3 are separately connected the 1st pin and the 2nd pin of integrated opto-coupler chip U2, one end of current-limiting resistance R2 connects the 1st pin of integrated opto-coupler chip U2, the other end of current-limiting resistance R2 connects output end V1, the 2nd pin of integrated opto-coupler chip U2 passes through the resistance R4 being sequentially connected in series, capacitor C6 and resistance R11 ground connection, the 2nd pin of integrated opto-coupler chip U2 connects the cathode of power supply chip U3 simultaneously, resistance R5 is equipped between output end V1 and resistance R11, output end V2 passes through the resistance R6 being sequentially connected in series and resistance R11 ground connection, diode D1 is equipped between output end V1 and output end V2.The utility model preferably improves the power density of Switching Power Supply, stablizes safety, and the stability of industrial equipment and safety is made to increase.
Description
Technical field
The utility model belongs to power circuit technical field, and in particular to a kind of double feedback switch multiple power supplies circuits.
Background technique
As the intelligence of industrial equipment and trend toward miniaturization are more and more obvious, people are to being widely used in industrial equipment
Switching Power Supply also proposed the requirement such as diversity output, high integration, high stability, high security, but traditional switch is electric
The feedback in source is usually to be adjusted by a Voltage loop and an electric current loop, usually exports electricity all the way by that of high-pressure heavy-load
Primary feedback of the source as Voltage loop, so available good guarantee of the voltage accuracy of most of power supply in equipment,
Those are just relatively weaker for the precision of the supply voltage of the low pressure underloading of chip power supply in equipment, can be used as industrial equipment brain
Integrated chip it is higher to the susceptibility of power supply.
Summary of the invention:
The purpose of the utility model is to provide a kind of double feedback switch multiple power supplies circuits, have been able to ascend Switching Power Supply
Power density and stability, to solve the problems, such as background technique.
To achieve the goals above, the technical solution of the utility model are as follows:
A kind of double feedback switch multiple power supplies circuits: the input terminal of PWM drive circuit connects the 3rd of integrated opto-coupler chip U2
Pin, the both ends of current-limiting resistance R3 are separately connected the 1st pin and the 2nd pin of integrated opto-coupler chip U2, and the one of current-limiting resistance R2
End connects the 1st pin of integrated opto-coupler chip U2, and the other end of current-limiting resistance R2 connects output end V1, integrates opto-coupler chip U2's
2nd pin passes through the resistance R4, the capacitor C6 that are sequentially connected in series and resistance R11 ground connection, and the 2nd pin of integrated opto-coupler chip U2 connects simultaneously
The cathode of power supply chip U3 is connect, resistance R5 is equipped between output end V1 and resistance R11, between resistance R5 and resistance R11
Common point connects the reference voltage pin of power supply chip U3, and output end V2 passes through the resistance R6 being sequentially connected in series and resistance R11 ground connection,
Diode D1 is equipped between output end V1 and output end V2.
Preferably, the positive terminal of diode D1 connects output end V1, the negative pole end of diode D1 connects output end V2.
Preferably, the positive terminal of power supply chip U3 is grounded.
Preferably, the model HCPL-817-50CE of integrated opto-coupler chip U2.
Preferably, the model TL431AIDR of power supply chip U3.
Preferably, the 3rd pin of integrated opto-coupler chip U2 is connected to the compensation circuit of PWM drive circuit input terminal.
The 3rd pin of photoelectrical coupler U2 is phototriode emitter, the 1st pin light emitting diode of photoelectrical coupler U2
Anode tap.
The utility model has the beneficial effects that: the utility model is simultaneously using high-low pressure two-way out-put supply as Voltage loop
Feedback can improve the dynamic response of Switching Power Supply high-pressure heavy-load output supply voltage and low pressure is maintained to be lightly loaded out-put supply
The precision of voltage, furthermore when high voltage power supply load short circuits for users to use outside, Switching Power Supply can promptly stop working, and protect
It is against damages to protect equipment.The utility model preferably improves the power density of Switching Power Supply, stablizes safety, makes industrial equipment
Stability and safety increase.The load regulation of Switching Power Supply multiple-output electric power voltage can be improved, maintain output
The precision of power supply high voltage and low-voltage has preferable actual application prospect so that product facility be enable more steadily to work.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the utility model embodiment.
Specific embodiment
The utility model is described further with reference to the accompanying drawings and examples.
A kind of double-fed switching power circuit of the utility model, the power supply control chip output one of general Switching Power Supply topology
The PWM wave of a adjustable pulse width drives the turn-on and turn-off of major loop switching tube, so that the secondary side in pulse transformer obtains me
Required voltage source.By sampling to the high voltage heavy duty voltage source wherein exported all the way, power supply is then fed back to
It controls chip and adjusts each road output voltage source of Switching Power Supply with this to adjust the pulse width of PWM wave.This is practical new
The key of type is by the high-pressure heavy-load source of Switching Power Supply output and low pressure underloading source by reasonably adjusting load-sensitive degree, then
Feedback signal as power supply control chip simultaneously realizes the stability of output supply voltage precision.
A kind of double feedback switch multiple power supplies circuits: the input terminal of PWM drive circuit connects the 3rd of integrated opto-coupler chip U2
Pin, the both ends of current-limiting resistance R3 are separately connected the 1st pin and the 2nd pin of integrated opto-coupler chip U2, and the one of current-limiting resistance R2
End connects the 1st pin of integrated opto-coupler chip U2, and the other end of current-limiting resistance R2 connects output end V1, integrates opto-coupler chip U2's
2nd pin passes through the resistance R4, the capacitor C6 that are sequentially connected in series and resistance R11 ground connection, and the 2nd pin of integrated opto-coupler chip U2 connects simultaneously
The cathode of power supply chip U3 is connect, resistance R5 is equipped between output end V1 and resistance R11, between resistance R5 and resistance R11
Common point connects the reference voltage pin of power supply chip U3, and output end V2 passes through the resistance R6 being sequentially connected in series and resistance R11 ground connection,
Diode D1 is equipped between output end V1 and output end V2.
It originally is in embodiment, the positive terminal of diode D1 connects output end V1, and the negative pole end of diode D1 connects output end
V2.The positive terminal of power supply chip U3 is grounded.The model HCPL-817-50CE of integrated opto-coupler chip U2.The type of power supply chip U3
Number be TL431AIDR.The 3rd pin of integrated opto-coupler chip U2 is connected to the compensation circuit of PWM drive circuit input terminal.Photoelectricity
The 3rd pin of coupler U2 is phototriode emitter, the 1st pin light emitting diode anode tap of photoelectrical coupler U2.
As shown in Figure 1, being originally the circuit structure of embodiment and the course of work includes: secondary side in power supply, the limit of optocoupler
Leakage resistance R3 is connected in parallel on the 1 of U2, between 2 feet, 1 foot of a termination optocoupler of current-limiting resistance R2, and another termination output V1；Resistance R5
The bleeder circuit of V1 output is composed in series with R11, R6 R11 of resistance is composed in series the bleeder circuit of V2 output, diode D1's
Anode meets output V1, and cathode meets output V2；2 feet (cathode) of U2 are connected with 1 foot (cathode) of U3, and the 2 of U3,3,6,7 feet are (just
Pole) it draws to ground, 8 feet (REF) the access resistance R5 of U3, the common end of R6, R11；After resistance R4 and capacitor C6 series connection, one end access
1 foot (cathode) of U3, the other end access 8 feet (REF) of U3.
In the primary side of power supply namely the PWM drive circuit of the present embodiment, U1 exports a 5V by 8 feet (VREF)
Reference voltage, 4 feet of optocoupler U2 access the reference voltage, 2 feet (VFB) of the 3 feet access U1 of U2,2 feet (VFB) of U1 and 1
Compensation circuit (capacitor C3, C5 and resistance R7) is accessed between foot (COMP).One end of the 3 feet access current-limiting resistance R10 of U2 simultaneously,
The other end of R10 is by drawing to ground ground resistance R14；The basis set of NPN type triode Q3 is accessed simultaneously.The collector of Q3 passes through electricity
Hinder 8 feet (VREF) of R13 access U1；The gate pole of thyristor Q2 is accessed simultaneously.The gate pole of Q2 meets decoupling capacitor a C8, Q2 over the ground
Cathode be connected to ground, the anode of Q2 accesses 7 feet (VCC) of U1 by current-limiting resistance R9.
The utility model is generally used for a kind of Switching Power Supply topology of inverse-excitation type, and common power supply control chip is TI
Pulse width modulating chip UC2845.1 foot and 2 feet of chip U1 is error amplification input terminal, and 8 feet are a reference source of 5V.R1 and C4 group
It is set at the switching frequency of U1.U2 is the optocoupler for Voltage Feedback, and U3 is the reference voltage source of feedback.The two-way power supply of output
It is low pressure underloading voltage source V1 (use of internal system chip) and high-pressure heavy-load voltage source V2 respectively (outside internal system and user
Using).Resistance R5, R6, R11 are used for the sampling of out-put supply V1 and V2, and R2 and R3 are the primary side current-limiting resistances of optocoupler U2, R4 and
C6 is the impedance and adjust gain for matching a reference source feedback end.When the power supply V2 voltage used for outside reduces, at this time
V1 can also be reduced simultaneously, lead to the 1 of U2, and electric current reduces between 2 feet, and the feedback voltage for exporting 3 feet of U2 reduces, and be input to U1
The voltage of 2 feet (VFB) reduce, the duty ratio that causes 6 feet (OUT) of chip U1 export increase, so that the output of power supply V1, V2
Voltage recovery, to achieve the purpose that while adjust multiple-channel output voltage.The effect of diode D1 is: when the electricity used for outside
When short circuit occurs for source V2, diode D1 drags down the current potential of power supply V1 simultaneously, so that optocoupler U2 is stopped working, 3 feet at this time pass through electricity
Resistance R10 and resistance R14 is pulled to zero potential, and the basis set voltage of Q3 is also zero Q3 to be ended, and the gate voltage of Q2 passes through U1 at this time
The reference voltage of 8 feet (VREF) output be pulled to 5V so that the positive and negative anodes of Q2 be connecteds, it is fast that VCC voltage passes through resistance R9 and Q2
Speed electric discharge, 8 feet of chip U1 lose VCC power voltage supply and stop working, to avoid equipment damage.8 feet of chip U1 are also logical
Capacitor C2 ground connection, 4 feet of the base stage connection chip U1 of triode Q1 are crossed, collector connects 8 feet of U1, and emitter passes through resistance R8
Connect 3 feet of chip U1.The capacitor C3 and C5 of compensation circuit connect the anode of diode D2, the cathode connection of diode D2 jointly
The anode of diode D3, while being grounded by capacitor C7, also pass through 8 feet (VREF) of resistance R12 connection U1, the yin of diode D3
8 feet (VREF) of pole connection U1.
Switching Power Supply power supply VCC foundation after, chip U1 start to work, at this time transformer secondary out-put supply V1 and
V2, entire circuit work normally.By adjusting R5, the resistance value of R6, R11 keep the sampling susceptibility of power supply V1 and V2 roughly the same,
When external user power supply V2 voltage or internal electric source V1 voltage change, the pulse width of the output PWM of chip U1 is corresponding
Adjustment, to maintain the stabilization of V1 or V2 voltage；When short circuit occurs for external power supply V2, V1 is also pulled low by diode D1,
Output end is not fed back at this time, and 3 feet of U2 are low level, and Q3 ends, and Q2 conducting, VCC is pulled low, and U1 stops working, and output is closed
It is disconnected.Until external V2 short circuit releases.
In conclusion realizing the steady of control multiple-channel output voltage by the level of feedback output power supply V1 and V2 simultaneously
It is qualitative, while realizing short-circuit protection function, achieve the purpose that multiple-output electric power voltage accuracy is high.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations all should belong to the protection scope of the appended claims for the utility model.Do not make in this specification in detail
What is carefully described partly belongs to the prior art well known to professional and technical personnel in the field.
Claims (6)
1. a kind of double feedback switch multiple power supplies circuits, it is characterised in that: the input terminal of PWM drive circuit connects integrated optocoupler core
The 3rd pin of piece U2, the both ends of current-limiting resistance R3 are separately connected the 1st pin and the 2nd pin of integrated opto-coupler chip U2, current limliting electricity
The one end for hindering R2 connects the 1st pin of integrated opto-coupler chip U2, and the other end of current-limiting resistance R2 connects output end V1, integrates optocoupler
The 2nd pin of chip U2 passes through the resistance R4, the capacitor C6 that are sequentially connected in series and resistance R11 ground connection, and the 2nd of integrated opto-coupler chip U2 is drawn
Foot connects the cathode of power supply chip U3 simultaneously, and resistance R5, the resistance R5 and the electricity are equipped between output end V1 and resistance R11
Hinder the reference voltage pin of the common point connection power supply chip U3 between R11, output end V2 pass through the resistance R6 that is sequentially connected in series and
Resistance R11 ground connection, is equipped with diode D1 between output end V1 and output end V2.
2. a kind of double feedback switch multiple power supplies circuits according to claim 1, it is characterised in that: the diode D1's
Positive terminal connects the output end V1, and the negative pole end of the diode D1 connects the output end V2.
3. a kind of double feedback switch multiple power supplies circuits according to claim 1, it is characterised in that: power supply chip U3 is just
Extreme ground connection.
4. a kind of double feedback switch multiple power supplies circuits according to claim 1, it is characterised in that: integrated opto-coupler chip U2
Model HCPL-817-50CE.
5. a kind of double feedback switch multiple power supplies circuits according to claim 1, it is characterised in that: the type of power supply chip U3
Number be TL431AIDR.
6. a kind of double feedback switch multiple power supplies circuits according to claim 1, it is characterised in that: integrated opto-coupler chip U2
The 3rd pin be connected to the compensation circuit of the PWM drive circuit input terminal；
The 3rd pin of photoelectrical coupler U2 is phototriode emitter, the 1st pin light-emitting diodes tube anode of photoelectrical coupler U2
End.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820953388.0U CN208638251U (en) | 2018-06-21 | 2018-06-21 | A kind of double feedback switch multiple power supplies circuits |
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| CN201820953388.0U CN208638251U (en) | 2018-06-21 | 2018-06-21 | A kind of double feedback switch multiple power supplies circuits |
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| CN208638251U true CN208638251U (en) | 2019-03-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646829A (en) * | 2019-09-20 | 2020-01-03 | 绵阳市维博电子有限责任公司 | Power supply for SiPM tube bias voltage and nuclear signal detection device |
| CN111638746A (en) * | 2020-06-19 | 2020-09-08 | 西安微电子技术研究所 | Voltage and current control mode automatic switching circuit and method |
-
2018
- 2018-06-21 CN CN201820953388.0U patent/CN208638251U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646829A (en) * | 2019-09-20 | 2020-01-03 | 绵阳市维博电子有限责任公司 | Power supply for SiPM tube bias voltage and nuclear signal detection device |
| CN110646829B (en) * | 2019-09-20 | 2021-06-29 | 绵阳市维博电子有限责任公司 | Power supply for SiPM tube bias voltage and nuclear signal detection device |
| CN111638746A (en) * | 2020-06-19 | 2020-09-08 | 西安微电子技术研究所 | Voltage and current control mode automatic switching circuit and method |
| CN111638746B (en) * | 2020-06-19 | 2021-08-24 | 西安微电子技术研究所 | Voltage and current control mode automatic switching circuit and method |
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| CP03 | Change of name, title or address |
Address after: 430040 workshop D, no.6, ligongyuan Road, Science Park, Wuhan University of technology, Donghu Development Zone, Wuhan City, Hubei Province Patentee after: Wuhan Gangdi Technology Co.,Ltd. Address before: 430223 No. 6, Ligong Road, science and Technology Park, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee before: WUHAN GUIDE ELECTRIC DRIVE TECHNOLOGY Co.,Ltd. |
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