CN103166431A - Switching power supply load end voltage stabilizing circuit with integrated common mode filter - Google Patents
Switching power supply load end voltage stabilizing circuit with integrated common mode filter Download PDFInfo
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- CN103166431A CN103166431A CN2013100772040A CN201310077204A CN103166431A CN 103166431 A CN103166431 A CN 103166431A CN 2013100772040 A CN2013100772040 A CN 2013100772040A CN 201310077204 A CN201310077204 A CN 201310077204A CN 103166431 A CN103166431 A CN 103166431A
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Abstract
The invention discloses a switching power supply load end voltage stabilizing circuit with an integrated common mode filter. The switching power supply load end voltage stabilizing circuit with the integrated common mode filter comprises an operational amplifier N1, a pulse-width modulation (PWM) controller N2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and an integrated common mode filter L1. A load end voltage sampling signal is connected with the integrated common mode filter L1 and then connected with an isolating amplifying circuit, and the load end voltage sampling signal is in output connection with a PI regulating ring. Common mode interference of the load end voltage sampling signal is removed through the integrated common mode filter L1, then the load end voltage sampling signal is isolated and amplified through a differential circuit formed by the operational amplifier N1, a voltage sampling signal is output, and the output voltage sampling signal enters into the PI regulating ring formed by the PWM controller N2. The switching power supply load end voltage stabilizing circuit has the advantages of high voltage stabilization accuracy and high capacity of resisting interference.
Description
Technical field
The present invention relates to a kind of Switching Power Supply load end voltage stabilizing circuit, particularly a kind of Switching Power Supply load end voltage stabilizing circuit that adopts integrated common-mode filter.
Background technology
Along with power consumption equipment to power supply improving constantly that the load end precision of voltage regulation requires, the remote sample circuit of power supply is proposed higher requirement: precision is high, antijamming capability is strong etc.Switching Power Supply load end voltage stabilizing circuit commonly used, comprise: operational amplifier N1, PWM controller N2, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4 and common-mode filter, this voltage stabilizing circuit poor anti jamming capability, precision is low etc., can not satisfy the demands.
Summary of the invention
The object of the present invention is to provide a kind of Switching Power Supply load end voltage stabilizing circuit that adopts integrated common-mode filter, solve the voltage stabilizing circuit poor anti jamming capability of using independent common-mode filter, the problem that precision is low.
A kind of Switching Power Supply load end voltage stabilizing circuit that adopts integrated common-mode filter, comprise: operational amplifier N1, PWM controller N2, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4 also comprise: integrated common-mode filter L1.the voltage sample anode is connected with the Vs+ end of integrated common-mode filter L1, the Vs+ ' of integrated common-mode filter L1 is connected with an end of resistance R 1, the other end of resistance R 1 is connected anode with an end of resistance R 3 respectively and is connected with operational amplifier N1, the other end of resistance R 3 is connected with ground, the voltage sample negative terminal is connected with the Vs-end of integrated common-mode filter L1, Vs-' the end of integrated common-mode filter L1 is connected with an end of resistance R 2, the other end of resistance R 2 is connected negative terminal with an end of resistance R 4 respectively and is connected with operational amplifier N1, the other end of resistance R 4 is connected with the end that the output of operational amplifier N1 is connected with resistance R respectively, the other end of resistance R 5 is connected with the end that an end of resistance R 6 is connected with capacitor C respectively, PWM controller N2-V end respectively with the other end of resistance R 6, the other end of capacitor C 1, the end that one end of resistance R 7 is connected with capacitor C connects, one end of capacitor C 2 is connected with the other end of resistance R 7, the COMP end of PWM controller N2 is connected with the other end that the other end of capacitor C 2 is connected with capacitor C respectively, PWM controller N2+V end is connected with an end of resistance R 8, the Vref end of PWM controller N2 is connected with the end that an end of resistance R 8 is connected with capacitor C respectively, the other end of capacitor C 4 is connected with ground.
after load terminal voltage sampled signal Vout+ eliminates common mode disturbances through integrated common-mode filter L1, by entering the anode of operational amplifier N1 after resistance R 1 and resistance R 3 dividing potential drops, after load terminal voltage sampled signal Vout-eliminates common mode disturbances through integrated common-mode filter L1, by entering the negative terminal of operational amplifier N1 after resistance R 2 and resistance R 4 dividing potential drops, export the voltage signal of corresponding load terminal voltage from the O end of operational amplifier N1, this voltage signal is through resistance R 5, enter after resistance R 6 and capacitor C 1 dividing potential drop the PWM controller-V end, voltage reference signal through resistance R 8 enter the PWM controller+V end, bucking voltage is by the COMP end output of PWM controller, through capacitor C 3, enter after capacitor C 2 and resistance R 7 the PWM controller-V end forms negative feedback, the OUTA end of PWM controller and OUTB end output pwm control signal, control the switching tube of main circuit.
This circuit has advantages of that the precision of voltage regulation is high, antijamming capability is strong.
Description of drawings
A kind of structural representation that adopts the Switching Power Supply load end voltage stabilizing circuit of integrated common-mode filter of Fig. 1.
Embodiment
A kind of Switching Power Supply load end voltage stabilizing circuit that adopts integrated common-mode filter, comprise: operational amplifier N1, PWM controller N2, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4 also comprise: integrated common-mode filter L1.the voltage sample anode is connected with the Vs+ end of integrated common-mode filter L1, the Vs+ ' of integrated common-mode filter L1 is connected with an end of resistance R 1, the other end of resistance R 1 and an end of resistance R 3 are connected anode and are connected with operational amplifier N1, the other end of resistance R 3 is connected with ground, the voltage sample negative terminal is connected with the Vs-end of integrated common-mode filter L1, Vs-' the end of integrated common-mode filter L1 is connected with an end of resistance R 2, the other end of resistance R 2 and an end of resistance R 4 are connected negative terminal and are connected with operational amplifier N1, the other end of resistance R 4 is connected with the end that the output of operational amplifier N1 is connected with resistance R, the other end of resistance R 5 is connected with the end that an end of resistance R 6 is connected with capacitor C, the PWM controller-other end of V end and resistance R 6, the other end of capacitor C 1, the end that one end of resistance R 7 is connected with capacitor C connects, one end of capacitor C 2 is connected with the other end of resistance R 7, the COMP end of PWM controller is connected with the other end that the other end of capacitor C 2 is connected with capacitor C, the PWM controller+V end is connected with an end of resistance R 8, the Vref end of PWM controller is connected with the end that an end of resistance R 8 is connected with capacitor C, the other end of capacitor C 4 is connected with ground.
after load terminal voltage sampled signal Vout+ eliminates common mode disturbances through integrated common-mode filter L1, by entering the anode of operational amplifier N1 after resistance R 1 and resistance R 3 dividing potential drops, after load terminal voltage sampled signal Vout-eliminates common mode disturbances through integrated common-mode filter L1, by entering the negative terminal of operational amplifier N1 after resistance R 2 and resistance R 4 dividing potential drops, export the voltage signal of corresponding load terminal voltage from the O end of operational amplifier N1, this voltage signal is through resistance R 5, enter after resistance R 6 and capacitor C 1 dividing potential drop the PWM controller-V end, voltage reference signal through resistance R 8 enter the PWM controller+V end, bucking voltage is by the COMP end output of PWM controller, through capacitor C 3, enter after capacitor C 2 and resistance R 7 the PWM controller-V end forms negative feedback, the OUTA end of PWM controller and OUTB end output pwm control signal, control the switching tube of main circuit.
Claims (1)
1. Switching Power Supply load end voltage stabilizing circuit that adopts integrated common-mode filter, comprise: operational amplifier N1, PWM controller N2, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4 characterized by further comprising: integrated common-mode filter L1, the voltage sample anode is connected with the Vs+ end of integrated common-mode filter L1, the Vs+ ' of integrated common-mode filter L1 is connected with an end of resistance R 1, the other end of resistance R 1 is connected anode with an end of resistance R 3 respectively and is connected with operational amplifier N1, the other end of resistance R 3 is connected with ground, the voltage sample negative terminal is connected with the Vs-end of integrated common-mode filter L1, Vs-' the end of integrated common-mode filter L1 is connected with an end of resistance R 2, the other end of resistance R 2 is connected negative terminal with an end of resistance R 4 respectively and is connected with operational amplifier N1, the other end of resistance R 4 is connected with the end that the output of operational amplifier N1 is connected with resistance R respectively, the other end of resistance R 5 is connected with the end that an end of resistance R 6 is connected with capacitor C respectively, PWM controller N2-V end respectively with the other end of resistance R 6, the other end of capacitor C 1, the end that one end of resistance R 7 is connected with capacitor C connects, one end of capacitor C 2 is connected with the other end of resistance R 7, the COMP end of PWM controller N2 is connected with the other end that the other end of capacitor C 2 is connected with capacitor C respectively, PWM controller N2+V end is connected with an end of resistance R 8, the Vref end of PWM controller N2 is connected with the end that an end of resistance R 8 is connected with capacitor C respectively, the other end of capacitor C 4 is connected with ground,
after load terminal voltage sampled signal Vout+ eliminates common mode disturbances through integrated common-mode filter L1, by entering the anode of operational amplifier N1 after resistance R 1 and resistance R 3 dividing potential drops, after load terminal voltage sampled signal Vout-eliminates common mode disturbances through integrated common-mode filter L1, by entering the negative terminal of operational amplifier N1 after resistance R 2 and resistance R 4 dividing potential drops, export the voltage signal of corresponding load terminal voltage from the O end of operational amplifier N1, this voltage signal is through resistance R 5, enter after resistance R 6 and capacitor C 1 dividing potential drop the PWM controller-V end, voltage reference signal through resistance R 8 enter the PWM controller+V end, bucking voltage is by the COMP end output of PWM controller, through capacitor C 3, enter after capacitor C 2 and resistance R 7 the PWM controller-V end forms negative feedback, the OUTA end of PWM controller and OUTB end output pwm control signal, control the switching tube of main circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310077204.0A CN103166431B (en) | 2013-03-12 | 2013-03-12 | A kind of Switching Power Supply load end voltage stabilizing circuit adopting integrated common-mode filter |
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| CN201310077204.0A CN103166431B (en) | 2013-03-12 | 2013-03-12 | A kind of Switching Power Supply load end voltage stabilizing circuit adopting integrated common-mode filter |
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| CN103166431A true CN103166431A (en) | 2013-06-19 |
| CN103166431B CN103166431B (en) | 2015-10-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105867225A (en) * | 2016-04-13 | 2016-08-17 | 广州市联特电子科技有限公司 | Load control circuit and control method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5914638A (en) * | 1997-06-06 | 1999-06-22 | Omnivision Technologies, Inc. | Method and apparatus for adjusting the common-mode output voltage of a sample-and-hold amplifier |
| CN2862144Y (en) * | 2005-09-02 | 2007-01-24 | 吕晓峰 | Constant-current source apparatus |
| CN102645557A (en) * | 2012-05-06 | 2012-08-22 | 中国兵器工业集团第七0研究所 | Magnetoelectric sensor conditioning circuit capable of accurately determining engine phase |
| CN102710135A (en) * | 2012-06-25 | 2012-10-03 | 北京机械设备研究所 | Current equalization circuit for multi-module shunt-wound power supply |
-
2013
- 2013-03-12 CN CN201310077204.0A patent/CN103166431B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5914638A (en) * | 1997-06-06 | 1999-06-22 | Omnivision Technologies, Inc. | Method and apparatus for adjusting the common-mode output voltage of a sample-and-hold amplifier |
| CN2862144Y (en) * | 2005-09-02 | 2007-01-24 | 吕晓峰 | Constant-current source apparatus |
| CN102645557A (en) * | 2012-05-06 | 2012-08-22 | 中国兵器工业集团第七0研究所 | Magnetoelectric sensor conditioning circuit capable of accurately determining engine phase |
| CN102710135A (en) * | 2012-06-25 | 2012-10-03 | 北京机械设备研究所 | Current equalization circuit for multi-module shunt-wound power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105867225A (en) * | 2016-04-13 | 2016-08-17 | 广州市联特电子科技有限公司 | Load control circuit and control method thereof |
| CN105867225B (en) * | 2016-04-13 | 2018-08-10 | 广州市联特电子科技有限公司 | Load control circuit and its control method |
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| CN103166431B (en) | 2015-10-07 |
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