CN104167924A - Double-current control circuit of switching power supply - Google Patents
Double-current control circuit of switching power supply Download PDFInfo
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- CN104167924A CN104167924A CN201410397551.6A CN201410397551A CN104167924A CN 104167924 A CN104167924 A CN 104167924A CN 201410397551 A CN201410397551 A CN 201410397551A CN 104167924 A CN104167924 A CN 104167924A
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Abstract
The invention discloses a double-current control circuit of a switching power supply. A switching tube current sampling device is arranged on a circuit primary edge. An output current sampling device is arranged on a circuit auxiliary edge. An error amplifier compares primary error signals generated by reference voltage and output voltage passing through a sampling network, and the error signals, auxiliary edge output current detected by the output current sampling device and switching current detected by the switching tube current sampling device are connected to the error amplifier together to generate secondary error signals. The secondary error signals are connected to a PWM comparator to generate PWM pulses and adjust the circuit output. According to the double-current control circuit of the switching power supply, switching current signals of a primary edge switching tube are simply introduced into an average current control mode to control the switching power supply so that order reduction can be conducted on a control loop due to the average current control mode, and the current of a primary edge switch can be controlled in real time. In addition, slope compensation does not need to be additionally introduced, and control can be more timely and more accurate.
Description
Technical field
The present invention relates to a kind of current mode control circuit, particularly a kind of Switching Power Supply double-current control circuit.
Background technology
The protective circuit of general power supply adopts Peak Current-Mode Controlled Circuit; derive from the single-ended self-activated switch power supply with primary current defencive function in the later stage sixties; in the later stage seventies just from academicly furtheing investigate; until the initial stage eighties; along with the appearance of first Controlled in Current Mode and Based PWM integrated circuit is applied rapidly Controlled in Current Mode and Based, be mainly used in single-ended and push-pull circuit.In recent years, difficulty and noise robustness that during due to big space rate, necessary synchronous undistorted slope compensation technology realizes are poor, and Controlled in Current Mode and Based is faced with the challenge of the voltage mode control improving after performance.
Also there is certain defect in peak-current mode control, because utilizing former limit or secondary peak current waveform and a fixed value comparison, antijamming capability is very weak, and can not directly control output circuit, need to add very large slope-compensation.
Average current control mode, utilize secondary output current wave and the comparison of voltage deviation value, and have good output current control, but there is leakage inductance or resonant inductance in circuit time, can not control well the peak current on former limit, easily make the excessive or transformer bias of switching current.
Notoriously, adopt voltage mode control to exist circuit unstable, the problems such as transformer bias, bad to circuit protection, and there is less bandwidth compared with peak-current mode control PWM, thereby seldom adopt.
Summary of the invention
Goal of the invention: the object of the invention is in order to solve above the deficiencies in the prior art; a kind of Switching Power Supply double-current control circuit is provided, has strengthened the antijamming capability of circuit, can directly control again output current; make transformer no longer need capacitance protection, control and become simple, effective.
Technical scheme: switching power source control circuit of the present invention, its objective is such realization, a kind of Switching Power Supply double-current control circuit, between bus the two poles of the earth, be in series with transformer and switching tube, described switching tube is provided with switching tube current sampling device, for detection of the transformer primary side switching current size at switching tube place;
The secondary output of described transformer is provided with output current sampling apparatus, for detection of the secondary output current size of transformer;
The output voltage of the secondary circuit of described transformer after sampling network through error amplifier and reference voltage comparison, produce one-level error signal, put-into error amplifier together with the transformer primary side switching current that the transformer secondary output current that one-level error signal detects with output current sampling apparatus detects with switching tube current sampling device, produces secondary error signal;
Secondary error signal access pwm pulse width modulated comparator, compares with fixing slope, produces pwm pulse, the one or more switching tubes in drive circuit.
According to above-described Switching Power Supply double-current control circuit, the output voltage of the secondary circuit of described transformer is one-level error amplifier with the error amplifier of reference voltage process after sampling network, and the error amplifier of the transformer secondary output current that the one-level error signal producing through one-level error amplifier detects with output current sampling apparatus process together with the transformer primary side switching current of switching tube current sampling device detection is secondary error amplifier.
According to above-described Switching Power Supply double-current control circuit, described switching tube current sampling device is current sample transformer, described current sample transformer is arranged on switching tube, by being arranged on the secondary full bridge rectifier that is provided with of current sensor on the former limit of circuit, 1,3 pins of full bridge rectifier are connected with inductive current transducer is secondary, and 2,4 pins are connected with switching tube current sampling resistor.
According to above-described Switching Power Supply double-current control circuit, described output current sampling apparatus is the sampling resistor of connecting with the tap of transformer secondary output center, on described transformer secondary circuit, series connection is provided with rectifying tube and the output capacitance that is parallel to output, and described output current sampling apparatus is located between the output center tap of transformer secondary and output capacitance.
Beneficial effect: Switching Power Supply double-current control circuit of the present invention, simply introduce primary current and carry out control switch power supply, and can not affect antijamming capability; Peak current is controlled at and accounts for appearance and must introduce slope-compensation when larger, the sawtooth waveforms comparison of this circuit Central Plains limit current waveform and RAMP, introduces slope-compensation automatically, need not introduce in addition slope-compensation, and can not change primary current waveform, make to control more accurate; Can easily output current be introduced and be controlled simultaneously, make controller can directly control the inductive current of output, make control loop depression of order, control more simple, direct; While use, need not add capacitance in bridge circuit, can control easily primary current by primary current waveform, prevent that transformer is saturated.
Brief description of the drawings
Fig. 1 is circuit connection diagram of the present invention;
Fig. 2 is control circuit of the present invention.
Embodiment
In order to deepen the understanding of the present invention, below in conjunction with embodiment and accompanying drawing, the invention will be further described, and this embodiment only, for explaining the present invention, does not form limiting the scope of the present invention.
Switching Power Supply double-current control circuit shown in Figure 1, and bus the two poles of the earth are put between former limit circuit two end nodes that switch is connected and are in series with inductance by two hilted broadsword lists respectively, transformer and switching tube, described switching tube is provided with switching tube current sampling device, switching tube current sampling device is current sample transformer, for detection of the transformer primary side switching current size at switching tube place, it is arranged on switching tube, by being arranged on the secondary full bridge rectifier that is provided with of inductive current transducer on the former limit of circuit, 1 of full bridge rectifier, 3 pins are connected with inductive current transducer is secondary, 2, 4 pins are connected with switching tube current sampling device.
Described output current sampling apparatus is the sampling resistor of connecting with the tap of transformer secondary output center, described transformer secondary series connection is provided with rectifying tube, output current sampling apparatus and is parallel to the output capacitance of output, described output current sampling apparatus is located between the output center tap of transformer secondary and output capacitance, for detection of the secondary output current size of transformer.
Control circuit shown in Figure 2, the secondary output voltage of described transformer after sampling network through one-level error amplifier and reference voltage comparison, produce one-level error signal, together with the transformer primary side switching current that the transformer secondary output current that one-level error signal detects with output current sampling apparatus detects with switching tube current sampling device, access secondary error amplifier, produce secondary error signal;
Secondary error signal access pwm pulse width modulated comparator, compares with fixing slope, produces pwm pulse, the one or more switching tubes in drive circuit.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a Switching Power Supply double-current control circuit, is characterized in that, is in series with transformer and switching tube between bus the two poles of the earth, and described switching tube is provided with switching tube current sampling device, for detection of the transformer primary side switching current size at switching tube place;
The secondary output of described transformer is provided with output current sampling apparatus, for detection of the secondary output current size of transformer;
The output voltage of the secondary circuit of described transformer after sampling network through error amplifier and reference voltage comparison, produce one-level error signal, put-into error amplifier together with the transformer primary side switching current that the transformer secondary output current that one-level error signal detects with output current sampling apparatus detects with switching tube current sampling device, produces secondary error signal;
Secondary error signal access pwm pulse width modulated comparator, compares with fixing slope, produces pwm pulse, the one or more switching tubes in drive circuit.
2. Switching Power Supply double-current control circuit according to claim 1, it is characterized in that, the output voltage of the secondary circuit of described transformer is one-level error amplifier with the error amplifier of reference voltage process after sampling network, and the error amplifier of the transformer secondary output current that the one-level error signal producing through one-level error amplifier detects with output current sampling apparatus process together with the transformer primary side switching current of switching tube current sampling device detection is secondary error amplifier.
3. Switching Power Supply double-current control circuit according to claim 1, it is characterized in that, described switching tube current sampling device is current sample transformer, described current sample transformer is arranged on switching tube, by being arranged on the secondary full bridge rectifier that is provided with of current sensor of former limit circuit, 1,3 pins of full bridge rectifier are connected with inductive current transducer is secondary, and 2,4 pins are connected with switching tube current sampling resistor.
4. Switching Power Supply double-current control circuit according to claim 1, it is characterized in that, described output current sampling apparatus is the sampling resistor of connecting with the tap of transformer secondary output center, on described transformer secondary circuit, series connection is provided with rectifying tube and the output capacitance that is parallel to output, and described output current sampling apparatus is located between the output center tap of transformer secondary and output capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410397551.6A CN104167924B (en) | 2014-08-13 | 2014-08-13 | A kind of Switching Power Supply double-current control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410397551.6A CN104167924B (en) | 2014-08-13 | 2014-08-13 | A kind of Switching Power Supply double-current control circuit |
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| CN104167924A true CN104167924A (en) | 2014-11-26 |
| CN104167924B CN104167924B (en) | 2018-11-27 |
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| CN201410397551.6A Active CN104167924B (en) | 2014-08-13 | 2014-08-13 | A kind of Switching Power Supply double-current control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233692A (en) * | 2017-12-19 | 2018-06-29 | 晶晨半导体(上海)股份有限公司 | A kind of soft starting circuit of switching regulator |
| CN108306504A (en) * | 2017-12-19 | 2018-07-20 | 晶晨半导体(上海)股份有限公司 | A kind of transient response circuit of switching regulator |
| CN108304022A (en) * | 2017-12-19 | 2018-07-20 | 晶晨半导体(上海)股份有限公司 | A kind of current foldback circuit of switching regulator |
| CN108566073A (en) * | 2017-12-19 | 2018-09-21 | 晶晨半导体(上海)股份有限公司 | A kind of transient response circuit of switching regulator |
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| CN201742299U (en) * | 2010-07-15 | 2011-02-09 | 电子科技大学 | Current mode multiple-output DC-DC switching power supply for secondary current sampling |
| CN102958245A (en) * | 2011-08-22 | 2013-03-06 | 松下电器产业株式会社 | Lighting device, headlamp lighting device and vehicle |
| CN103051172A (en) * | 2012-12-19 | 2013-04-17 | 扬州森源电气有限公司 | Magnetic bias suppression system and method of phase-shifted full bridge converter for photovoltaic power generation |
| CN103066851A (en) * | 2012-12-20 | 2013-04-24 | 西安电子科技大学 | Control circuit for primary side flyback type converter |
| CN202997663U (en) * | 2012-12-13 | 2013-06-12 | 周红艳 | Voltage stabilization constant current charging control circuit |
| CN204216785U (en) * | 2014-08-13 | 2015-03-18 | 南京创佳通讯电源设备厂 | A kind of Switching Power Supply double-current control circuit |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201742299U (en) * | 2010-07-15 | 2011-02-09 | 电子科技大学 | Current mode multiple-output DC-DC switching power supply for secondary current sampling |
| CN102958245A (en) * | 2011-08-22 | 2013-03-06 | 松下电器产业株式会社 | Lighting device, headlamp lighting device and vehicle |
| CN202997663U (en) * | 2012-12-13 | 2013-06-12 | 周红艳 | Voltage stabilization constant current charging control circuit |
| CN103051172A (en) * | 2012-12-19 | 2013-04-17 | 扬州森源电气有限公司 | Magnetic bias suppression system and method of phase-shifted full bridge converter for photovoltaic power generation |
| CN103066851A (en) * | 2012-12-20 | 2013-04-24 | 西安电子科技大学 | Control circuit for primary side flyback type converter |
| CN204216785U (en) * | 2014-08-13 | 2015-03-18 | 南京创佳通讯电源设备厂 | A kind of Switching Power Supply double-current control circuit |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233692A (en) * | 2017-12-19 | 2018-06-29 | 晶晨半导体(上海)股份有限公司 | A kind of soft starting circuit of switching regulator |
| CN108306504A (en) * | 2017-12-19 | 2018-07-20 | 晶晨半导体(上海)股份有限公司 | A kind of transient response circuit of switching regulator |
| CN108304022A (en) * | 2017-12-19 | 2018-07-20 | 晶晨半导体(上海)股份有限公司 | A kind of current foldback circuit of switching regulator |
| CN108566073A (en) * | 2017-12-19 | 2018-09-21 | 晶晨半导体(上海)股份有限公司 | A kind of transient response circuit of switching regulator |
| CN108306504B (en) * | 2017-12-19 | 2020-10-09 | 晶晨半导体(上海)股份有限公司 | Transient response circuit of switching regulator |
| CN108566073B (en) * | 2017-12-19 | 2020-10-09 | 晶晨半导体(上海)股份有限公司 | Transient response circuit of switching regulator |
| CN108304022B (en) * | 2017-12-19 | 2020-12-25 | 晶晨半导体(上海)股份有限公司 | Overcurrent protection circuit of switching regulator |
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| Publication number | Publication date |
|---|---|
| CN104167924B (en) | 2018-11-27 |
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Address after: 211135 300 Chi Hui Road, Qilin science and Technology Innovation Park, Nanjing, Jiangsu Applicant after: Nanjing Chuangjia Communication Power Equipment Co. Ltd. Address before: 211131 Jiangsu Nanjing Jiangning District Tangshan community Qilin Kai Cheng Road 10 Applicant before: NANJING CHUANGJIA COMMUNICATIONS POWER EQUIPMENT PLANT |
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