CN1158745C - Voltage current double loop regulating and current-limiting device - Google Patents
Voltage current double loop regulating and current-limiting device Download PDFInfo
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- CN1158745C CN1158745C CNB011052902A CN01105290A CN1158745C CN 1158745 C CN1158745 C CN 1158745C CN B011052902 A CNB011052902 A CN B011052902A CN 01105290 A CN01105290 A CN 01105290A CN 1158745 C CN1158745 C CN 1158745C
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Abstract
The present invention discloses a voltage-current double-loop regulating and current-limiting device. The present invention comprises a voltage type PWM control chip, a voltage-current double-loop control circuit and a constant current-limiting circuit, wherein the voltage-current double-loop control circuit arranged on the periphery of the voltage type PWM control chip is composed of resistors R3, R4, R5, R6 and R7, capacitors C2 and C3, operational amplifiers D2A and D3A and a diode VD2; the constant current-limiting circuit is composed of resistors R1 and R2, a capacitor C1, an operational amplifier D1A and a diode VD1. The present invention can obtain perfect regulation and control accuracy and response characteristics by regulating the parameters of the components, and thereby, the present invention expands the application mode of the voltage type PWM control chip.
Description
Technical field:
The present invention relates to the electric current and voltage adjusting device in the Switching Power Supply of the communications field.
Background technology:
At present, in the communications field, the application of Switching Power Supply more and more widely.In Switching Power Supply, its control circuit designs with integrated PWM (pulse-width modulation pulse widthmodulate) control chip usually, and the one, because design work is simple, design easily; The two is that the number of devices that circuit uses significantly reduces, and makes the reliability of switch power supply system increase substantially because with respect to the control circuit with the discrete device design.Pwm chip commonly used is broadly divided into two classes, and a class is the current-mode control chip, and another kind of is the voltage-type control chip.Just belong to the integrated control chip of voltage-type as SG1525, SG1527, UC3875 and UC3879 etc., they have only voltage control loop to exist on circuit structure.The integrated control chip of voltage-type is easy to use, and design work is also just relatively easy, and furthermore time of occurrence is longer, thereby uses comparatively extensive.For example, in powerful switch power supply system, use the control device of the circuit of full-bridge topologies how to design with UC3875 or UC3879.But because the restriction of the integrated control chip structure of voltage-type, make that this type control chip is a controlled quentity controlled variable with the output voltage of system only, and the important parameter of this power supply of electric current is failed to take into account, thereby make the power-supply system that is designed to the voltage-type pwm chip have many deficiencies, require all to have gap as indexs such as voltage regulation, load regulation and transient response etc. and ideal, and do not have the ability of current limliting, make power supply adjust precision and response characteristic undesirable.
At the problems referred to above, the purpose of this invention is to provide a kind of power supply and adjust the device of precision and response characteristic electric current and voltage dicyclo adjusting preferably and current limliting, make the voltage-type adjuster can introduce electric current, and can widen the scope of application of voltage-type control chip as the control parameter.
Summary of the invention:
For achieving the above object, the technical solution used in the present invention is: the device of a kind of electric current and voltage dicyclo adjusting and current limliting, comprise electric current and voltage dual-loop control circuit, constant current current-limiting circuit, voltage type PWM control chip and output voltage sampled signal terminal Vout+, current sampling signal terminal Isense, voltage given signal terminal VR and the given signal terminal IR of electric current, described electric current and voltage dual-loop control circuit comprises resistance R 3, R4, R5, R6 and R7, capacitor C 2, C3, operational amplifier D2A, D3A and diode VD2; Described constant current current-limiting circuit comprises resistance R 1 and R2, capacitor C 1, operational amplifier D1A and diode VD1; Wherein, current sampling signal terminal Isense is connected with the end of resistance R 1 and R3 respectively, the other end of resistance R 1 is connected with an end of resistance R 2, the reverse input end (2) of the amplifier of concatenation operation simultaneously D1A, and an end of capacitor C 1 is connected with the other end of resistance R 2, the other end is connected with the output (1) of operational amplifier D1A and the negative electrode of diode VD1; The other end of resistance R 3 is connected with an end of resistance R 7, the reverse input end (2) of the amplifier of concatenation operation simultaneously D3A, an end of capacitor C 3 is connected with the other end of resistance R 7, the other end is connected with the output (1) of operational amplifier D3A and the negative electrode of diode VD2 simultaneously; One end of resistance R 4 connects voltage given signal terminal VR, the other end is connected with the positive input (3) of operational amplifier, one end of resistance R 5 connects output voltage sampled signal terminal Vout+, the other end is connected with an end of resistance R 6 and the reverse input end (2) of operational amplifier, and an end of capacitor C 2 is connected with the other end of resistance R 6, the other end is connected with the output (1) of operational amplifier D2A and the positive input (3) of operational amplifier D3A simultaneously; The error of voltage type PWM control chip is amplified output Comp and is connected with the anode of diode VD1 and VD2 simultaneously.
Because the present invention has made up by resistance R 3, R4, R5, R6 and R7 in voltage type PWM control chip periphery, capacitor C 2, C3, the electric current and voltage dual-loop control circuit that operational amplifier D2A, D3A and diode VD2 form; And by resistance R 1 and R2, capacitor C 1, the constant current current-limiting circuit that operational amplifier D1A and diode VD1 constitute, as long as suitably adjust the parameter of components and parts, this circuit just can obtain desirable control accuracy and gratifying response characteristic, can expand and enrich the application mode of voltage type PWM control chip.
Description of drawings:
The present invention is further illustrated below in conjunction with drawings and Examples.
Fig. 1 is a circuit diagram of the present invention;
Fig. 2 is the circuit diagram of the embodiment of the invention.
Embodiment:
The described electric current and voltage dicyclo of the present invention of Fig. 1 regulates and the device of current limliting comprises that three have positive input 3, reverse input end 2, output 1 and power positive end 8, operational amplifier D1A, the D2A of negative pole end 4, D3A, a voltage type PWM control chip.This voltage-type control chip can adopt the voltage type PWM control chip of any type, and for example UC3879 can also be SG1525 certainly, SG1527, UC3875 etc.
The present invention also comprises resistance R 1, R2, R3, R4, R5, R6 and R7, capacitor C 1, C2H and C3, and diode VD1, VD2; Wherein, by resistance R 3, R4, R5, R6 and R7, capacitor C 2, C3, operational amplifier D2A, D3A and diode VD2 form the electric current and voltage dual-loop control circuit; And by resistance R 1 and R2, capacitor C 1, operational amplifier D1A and diode VD1 form the constant current current-limiting circuit.
In addition, also comprise following signal terminal in the circuit of the present invention: wherein, Vout+ is an output voltage sampled signal terminal, and Isense is the current sampling signal terminal, and VR is the voltage given signal terminal, and IR is the given signal terminal of electric current.
Component parts and signal terminal for the invention described above, one of resistance R 1 terminates on the Isense terminal, the other end of resistance R 1 is received the reverse input end 2 of operational amplifier D1A, resistance R 2 is connected with capacitor C 1, the end that resistance R 2 is not connected with capacitor C 1 also is connected to the reverse input end 2 of operational amplifier D1A, the end that capacitor C 1 is not connected with resistance R 2 is connected to the output 1 of operational amplifier D1A, the positive input 3 of operational amplifier D1A is connected to the IR terminal, one end of resistance R 4 is connected to the VR terminal, the other end of resistance R 4 is received the positive input 3 of operational amplifier D2A, one end of resistance R 5 is connected on the Vout+ terminal, the other end of resistance R 5 is connected to the reverse input end 2 of operational amplifier D2A, resistance R 6 is connected with capacitor C 2, the end that resistance R 6 is not connected with capacitor C 2 also is connected to the reverse input end 2 of operational amplifier D2A, the end that capacitor C 2 is not connected with resistance R 6 is connected to the output 1 of operational amplifier D2A, the output 1 of operational amplifier D2A also is connected to the positive input 3 of operational amplifier simultaneously, one end of resistance R 3 also is connected on the Isense terminal, the other end of resistance is connected to the reverse input end 2 of operational amplifier D3A, resistance R 7 is connected with capacitor C 3, the end that resistance R 7 is not connected with capacitor C 3 also is connected to the reverse input end 2 of operational amplifier D3A, the end that capacitor C 3 is not connected with resistance R 7 is connected to the output 1 of operational amplifier D3A, the negative electrode of diode VD1 also is connected to the output 1 of operational amplifier D1A, the negative electrode of diode VD2 also is connected to the output 1 of operational amplifier D2A, the anode of the anode of diode VD1 and diode VD2 is connected to the comp end (output of the error amplifier that the voltage type PWM control chip is built-in) of voltage type PWM control chip together, the terminal 8 of operational amplifier D1A, the terminal 8 of operational amplifier D2A, the terminal 8 of operational amplifier D3A, the Vcc end of voltage type PWM control chip together is connected on the positive source terminal terminal 4 of operational amplifier D1A, the terminal 4 of operational amplifier D2A, the terminal 4 of operational amplifier D3A, the GND of voltage type PWM control chip end together is connected on power supply ' ' terminal.
Above the model of described operational amplifier D1A, D2A, D3A identical.
Fig. 2 is described to be a specific embodiment of the present invention.Among this figure, increase a device R 8, simultaneously the voltage type PWM control chip has been embodied as UC3879.One of resistance R 8 terminates to 3 pin (the inverting input E/A-of the built-in error amplifier of UC3879) of UC3879, one of resistance R 8 terminates on power supply ' ' terminal, mainly is for fear of introduce unnecessary interference because of the input of built-in error amplifier is unsettled.
Claims (1)
1, the device of a kind of electric current and voltage dicyclo adjusting and current limliting, comprise electric current and voltage dual-loop control circuit, constant current current-limiting circuit, voltage type PWM control chip and output voltage sampled signal terminal Vout+, current sampling signal terminal Isense, voltage given signal terminal VR and the given signal terminal IR of electric current, it is characterized in that: described electric current and voltage dual-loop control circuit comprises resistance R 3, R4, R5, R6 and R7, capacitor C 2, C3, operational amplifier D2A, D3A and diode VD2; Described constant current current-limiting circuit comprises resistance R 1 and R2, capacitor C 1, operational amplifier D1A and diode VD1; Wherein, current sampling signal terminal Isense is connected with the end of resistance R 1 and R3 respectively, the other end of resistance R 1 is connected with an end of resistance R 2, the reverse input end (2) of the amplifier of concatenation operation simultaneously D1A, and an end of capacitor C 1 is connected with the other end of resistance R 2, the other end is connected with the output (1) of operational amplifier D1A and the negative electrode of diode VD1; The other end of resistance R 3 is connected with an end of resistance R 7, the reverse input end (2) of the amplifier of concatenation operation simultaneously D3A, an end of capacitor C 3 is connected with the other end of resistance R 7, the other end is connected with the output (1) of operational amplifier D3A and the negative electrode of diode VD2 simultaneously; One end of resistance R 4 connects voltage given signal terminal VR, the other end is connected with the positive input (3) of operational amplifier, one end of resistance R 5 connects output voltage sampled signal terminal Vout+, the other end is connected with an end of resistance R 6 and the reverse input end (2) of operational amplifier, and an end of capacitor C 2 is connected with the other end of resistance R 6, the other end is connected with the output (1) of operational amplifier D2A and the positive input (3) of operational amplifier D3A simultaneously; The error of voltage type PWM control chip is amplified output Comp and is connected with the anode of diode VD1 and VD2 simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011052902A CN1158745C (en) | 2001-01-22 | 2001-01-22 | Voltage current double loop regulating and current-limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011052902A CN1158745C (en) | 2001-01-22 | 2001-01-22 | Voltage current double loop regulating and current-limiting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1367414A CN1367414A (en) | 2002-09-04 |
| CN1158745C true CN1158745C (en) | 2004-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011052902A Expired - Lifetime CN1158745C (en) | 2001-01-22 | 2001-01-22 | Voltage current double loop regulating and current-limiting device |
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| Country | Link |
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| CN (1) | CN1158745C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3610556B1 (en) * | 2003-10-21 | 2005-01-12 | ローム株式会社 | Constant voltage power supply |
| CN111211674A (en) * | 2020-01-20 | 2020-05-29 | 南京航空航天大学 | Short circuit external characteristic implementation circuit and external characteristic implementation method |
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2001
- 2001-01-22 CN CNB011052902A patent/CN1158745C/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| CN1367414A (en) | 2002-09-04 |
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Owner name: SHENZHENG CITY ZTE CO., LTD. Free format text: FORMER OWNER: SHENZHENG CITY ZTE CO., LTD. SHANGHAI SECOND INSTITUTE Effective date: 20030724 |
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Effective date of registration: 20030724 Address after: 518057 Department of law, Zhongxing building, South Science and technology road, Nanshan District hi tech Industrial Park, Shenzhen Applicant after: Zhongxing Communication Co., Ltd., Shenzhen City Address before: 200233 No. 396, Shanghai, Guilin Road Applicant before: Shanghai Inst. of No.2, Zhongxing Communication Co., Ltd., Shenzhen City |
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Owner name: ZTE CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHENZHENG CITY ZTE CO., LTD. |
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Address after: 518057 Department of law, Zhongxing building, South Science and technology road, Nanshan District hi tech Industrial Park, Shenzhen Patentee after: ZTE Corporation Address before: 518057 Department of law, Zhongxing building, South Science and technology road, Nanshan District hi tech Industrial Park, Shenzhen Patentee before: Zhongxing Communication Co., Ltd., Shenzhen City |
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