CN104167924B - A kind of Switching Power Supply double-current control circuit - Google Patents
A kind of Switching Power Supply double-current control circuit Download PDFInfo
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- CN104167924B CN104167924B CN201410397551.6A CN201410397551A CN104167924B CN 104167924 B CN104167924 B CN 104167924B CN 201410397551 A CN201410397551 A CN 201410397551A CN 104167924 B CN104167924 B CN 104167924B
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Abstract
The invention discloses a kind of Switching Power Supply double-current control circuit, switching tube current sampling device is set in circuit primary side；Current sampling device is exported to be set on circuit pair side；Error amplifier compares the level-one error signal generated after the sampled network of output voltage with reference voltage, the put-into error amplifier together with the secondary side output electric current of output current sampling device detection and the switching current of switching tube current sampling device detection, generates second level error signal；Second level error signal accesses pwm pulse width modulated comparator, generates pwm pulse, adjusts circuit output.The switching current signal that the present invention simply introduces primary side switch pipe in average current control mode carrys out control switch power supply, so that control loop can make control loop depression of order because of average current control mode, primary side switch electric current can be controlled immediately again, and without additionally introducing slope-compensation, so that control is more in time, accurately.
Description
Technical field
The present invention relates to a kind of current mode control circuit, in particular to a kind of Switching Power Supply double-current control circuit.
Background technique
The protection circuit of general power supply uses Peak Current-Mode Controlled Circuit, and deriving from the later period sixties has primary current
The single-ended self-activated switch power supply of defencive function is just furtherd investigate from academicly in the later period seventies, until the initial stage eighties,
As the appearance of first Controlled in Current Mode and Based PWM integrated circuit is so that Controlled in Current Mode and Based promotes and applies rapidly, it is mainly used for
Single-ended and push-pull circuit.The necessary difficulty for synchronizing undistorted slope compensation technology and realizing when in recent years, due to big space rate
Degree and noise robustness are poor, and Controlled in Current Mode and Based is faced with the challenge of the voltage mode control after improving performance.
Peak-current mode control also suffers from certain drawbacks, because fixed using primary side or secondary side peak point current waveform and one
Value compares, and anti-interference ability is very weak, and cannot directly control output circuit, needs to add very big slope-compensation.
Average current control mode is compared using secondary side output current wave and voltage deviation value, and has preferable output
Current control, but when there is leakage inductance or resonant inductance in circuit, the peak point current of primary side cannot be controlled well, easily make to switch
Electric current is excessive or transformer bias.
The problems such as that there are circuits is unstable it is also known that using voltage mode control, transformer bias, to circuit protection
It is bad, and there is lesser bandwidth compared with peak-current mode controls PWM, thus seldom use.
Summary of the invention
Goal of the invention：The purpose of the present invention is to solve the above the deficiencies in the prior art, and it is double to provide a kind of Switching Power Supply
Current control circuit enhances the anti-interference ability of circuit, and can directly control output electric current so that transformer no longer need every
Straight capacitor protection, control become simple, effective.
Technical solution：Switching power source control circuit of the present invention, the purpose is to what is be achieved, a kind of Switching Power Supply
Double-current control circuit, transformer and switching tube are in series between bus the two poles of the earth, and the switching tube is equipped with switch tube current and adopts
Sampling device, for the transformer primary side switching current size where detection switch pipe；
The secondary side output end of the transformer is equipped with output current sampling device, and the secondary side for detecting transformer exports electricity
Flow size；
After the sampled network of the output voltage of the secondary circuit of the transformer through error amplifier compared with reference voltage,
Generate level-one error signal, the transformer secondary output electric current and switch of level-one error signal and output current sampling device detection
The transformer primary side switching current put-into error amplifier together of tube current sampling apparatus detection, generates second level error signal；
Second level error signal accesses pwm pulse width modulated comparator, is compared with fixed slope, generates PWM arteries and veins
It rushes, one or more switching tubes in driving circuit.
According to above-described Switching Power Supply double-current control circuit, the output voltage of the secondary circuit of the transformer is passed through
The error amplifier passed through after sampling network with reference voltage is level-one error amplifier, one generated through level-one error amplifier
The transformer secondary output electric current and switching tube current sampling device of grade error signal and output current sampling device detection detect
The error amplifier that passes through together of transformer primary side switching current be second level error amplifier.
According to above-described Switching Power Supply double-current control circuit, the switching tube current sampling device is current sample
Transformer, the current sample transformer are arranged on switching tube, and the current sample transformer secondary output is equipped with full-bridge rectification
Two exchange input pins of circuit, full bridge rectifier are connected with the current sample transformer secondary output, two direct current outputs
Pin is connected with switching tube current sampling resistor.
According to above-described Switching Power Supply double-current control circuit, the output current sampling device is and transformer pair
The concatenated sampling resistor of side output center tap, series connection is equipped with rectifying tube and is parallel to output end on the transformer secondary circuit
Output capacitance, the output current sampling device be set between transformer secondary output center tap and output capacitance.
Beneficial effect：Switching Power Supply double-current control circuit of the present invention is simple to introduce primary current to control out
Powered-down source, and will not influence anti-interference ability；Peak value comparison method must be introduced into slope-compensation, this circuit when accounting for and holding bigger
The sawtooth wave of middle primary side current waveform and RAMP compare, and are automatically introduced into slope-compensation, introduce slope-compensation without other, and will not
Change primary current waveform, so that control is more accurate；Can be convenient simultaneously output electric current is introduced controls, so that controller
The inductive current that output can be directly controlled makes control loop depression of order, controls more simple, direct；It is used in bridge circuit
When, without capacitance is added, primary current is controlled with can be convenient by primary current waveform, transformer is prevented to be saturated.
Detailed description of the invention
Fig. 1 is circuit connection diagram of the invention；
Fig. 2 is control circuit of the invention.
Specific embodiment
In order to deepen the understanding of the present invention, below in conjunction with embodiment and attached drawing, the invention will be further described, should
The examples are only for explaining the invention, is not intended to limit the scope of the present invention..
Switching Power Supply double-current control circuit shown in Figure 1 passes through two hilted broadsword lists with bus the two poles of the earth respectively and sets out
It correlates and is in series with inductance, transformer and switching tube between two end node of primary circuit connect, the switching tube is equipped with switching tube
Current sampling device, switching tube current sampling device is current sample transformer, for the transformer primary where detection switch pipe
Side switching current size is arranged on switching tube, and current sample transformer secondary output is equipped with full bridge rectifier, full-bridge rectification
Two exchange input pins 1,3 of circuit are connected with current sample transformer secondary output, two direct current output pins 2,4 and switching tube
Current sampling device is connected.
The output current sampling device be and the concatenated sampling resistor of transformer secondary output center tap, the transformation
The series connection of device pair side is equipped with rectifying tube, exports current sampling device and be parallel to the output capacitance of output end, and the output electric current is adopted
Sampling device is set between transformer secondary output center tap and output capacitance, and it is big that the secondary side for detecting transformer exports electric current
It is small.
Control circuit shown in Figure 2, through level-one error after the secondary sampled network of side output voltage of the transformer
Amplifier generates level-one error signal, the change of level-one error signal and output current sampling device detection compared with reference voltage
Depressor pair side output electric current and the transformer primary side switching current of switching tube current sampling device detection access second level error together
Amplifier generates second level error signal；
Second level error signal accesses pwm pulse width modulated comparator, is compared with fixed slope, generates PWM arteries and veins
It rushes, one or more switching tubes in driving circuit.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of Switching Power Supply double-current control circuit, which is characterized in that bus is in series with transformer and switching tube between the two poles of the earth,
The switching tube is equipped with switching tube current sampling device, big for the transformer primary side switching current where detection switch pipe
It is small；
The secondary side output end of the transformer is equipped with output current sampling device, and it is big that the secondary side for detecting transformer exports electric current
It is small；
The output current sampling device be and the concatenated sampling resistor of transformer secondary output center tap, the transformer pair
Series connection is equipped with rectifying tube and is parallel to the output capacitance of output end on the circuit of side, and the output current sampling device is set to transformer
Between secondary side output center tap and output capacitance；
After the sampled network of the output voltage of the secondary circuit of the transformer through error amplifier compared with reference voltage, generate
The transformer secondary output electric current and switching tube electricity of level-one error signal, level-one error signal and output current sampling device detection
The transformer primary side switching current put-into error amplifier together for flowing sampling apparatus detection, generates second level error signal；
Second level error signal accesses pwm pulse width modulated comparator, is compared with fixed slope, generates pwm pulse, drives
One or more switching tubes in dynamic circuit, after the sampled network of the output voltage of the secondary circuit of the transformer with reference electricity
The error amplifier that pressure is passed through is level-one error amplifier, the level-one error signal generated through level-one error amplifier and output electricity
The transformer primary side of the transformer secondary output electric current and the detection of switching tube current sampling device that flow sampling apparatus detection switchs electricity
Flowing the error amplifier passed through together is second level error amplifier.
2. Switching Power Supply double-current control circuit according to claim 1, which is characterized in that the switching tube current sample
Device is current sample transformer, and the current sample transformer is arranged on switching tube, the current sample transformer secondary output
It is equipped with full bridge rectifier, two exchange input pins and the current sample transformer secondary output phase of full bridge rectifier
Even, two direct current output pins are connected with switching tube current sampling resistor.
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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
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| CN104167924A CN104167924A (en) | 2014-11-26 |
| CN104167924B true 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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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2014
- 2014-08-13 CN CN201410397551.6A patent/CN104167924B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN104167924A (en) | 2014-11-26 |
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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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