CN105196878B - Voltage-stabilizing protection control method and chopping depressuring circuit based on chopping depressuring circuit - Google Patents
Voltage-stabilizing protection control method and chopping depressuring circuit based on chopping depressuring circuit Download PDFInfo
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- CN105196878B CN105196878B CN201510695007.4A CN201510695007A CN105196878B CN 105196878 B CN105196878 B CN 105196878B CN 201510695007 A CN201510695007 A CN 201510695007A CN 105196878 B CN105196878 B CN 105196878B
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Abstract
The invention discloses the voltage-stabilizing protection control method based on chopping depressuring circuit and chopping depressuring circuit; according to collection input voltage value compared with target voltage; PWM waveform Duty ratio control is exported by the G poles of switch tube; the break-make FREQUENCY CONTROL of MOSFET pipes is realized, so as to realize that the pressure regulation of output voltage acts on；Output voltage is acquired, adjusted in time when load changes, remains stable output target voltage；Simultaneously in the case where input voltage exceeds target voltage, MOSFET pipes are turned off in time, play a part of protection circuit.The circuit and its control method can realize low cost, the function of power protection of high reliability, by precisely sampling and rationally controlling, supporting suitable inductance capacitance, reach the purpose for realizing power supply adjustment and safeguard protection.
Description
Technical field
The invention belongs to automobile electrically-controlled technical field, and in particular to the voltage-stabilizing protection control method based on chopping depressuring circuit
With chopping depressuring circuit.
Background technology
For New-energy electric vehicle due to there is the high tension apparatus of high direct voltage and correlation, electromagnetic environment is severe, has a lot
Interference, in control interference source, block outside the method for approach, should also strengthen antijamming capability, wherein power supply at each part
Anti- transient impact ability be very important one.
BUCK circuits are the more common power supply processing modes for preventing transient impact and big voltage, and BUCK circuits are a kind of drops
Chopper is pressed, is the loop control theory figure of BUCK circuits as shown in Figure 1, buck converter output voltage average value is always less than
Whether input voltage, the electric current in usual inductance continuously depend on the numerical value of switching frequency, filter inductance L and electric capacity, simply
The spread of voltage of BUCK circuit outputs, it can be disturbed by load and outside, and closed-loop control can be realized by adding controller,
The sampled value of output voltage can be obtained by exporting sampling element, then output voltage sampling and voltage reference are sent to error amplification
Device, it is exported by certain compensation again with PWM, the switching waveform after being modulated, is controlled as switching signal
Switching tube Q break-make, the stabilization of output voltage is controlled, while also there is the ability of certain suppression input and load disturbance.But
It is for the power supply of electric automobile, it is 24V that it, which exports general requirement, but the input voltage of power supply is general higher, and this will
Power good and safety can also be kept when input voltage changes in increase on the basis of existing BUCK circuits closed-loop control by asking
Control function.
The content of the invention
It is an object of the invention to provide a kind of voltage-stabilizing protection control method based on chopping depressuring circuit, to realize in difference
Input voltage change and output loading change in the case of keep power supply stabilization and safety.Present invention simultaneously provides one kind to cut
Ripple reduction voltage circuit.
In order to realize the above object the technical solution adopted in the present invention is：A kind of voltage stabilizing based on chopping depressuring circuit
Control method is protected, it is as follows the step of this method：
(1) input voltage of circuit is sampled, and the input sample voltage and the target voltage of output end is carried out
Contrast, if input sample voltage be not more than target voltage, controlling switch pipe often effectively exports, it is on the contrary then according to input voltage and
The difference of target voltage, the control pole output PWM waveform of switch tube, controlling switch pipe export according to corresponding proportion, will be defeated
Go out voltage to control to target voltage；
(2) output voltage of circuit is sampled, and the output sampled voltage and the target voltage of output end is carried out
Contrast, if output sampled voltage is not less than target voltage, according to the difference of input voltage and target voltage, the control of switch tube
Pole processed exports PWM waveform, and controlling switch pipe exports according to corresponding proportion, so that output voltage is less than target voltage.
Chopping depressuring circuit is respectively by input voltage sample circuit and output voltage sampling circuit to input voltage, output
Voltage is sampled.
Input voltage sample circuit and output voltage sampling circuit are connected with main control chip, the output of the main control chip
End is connected by PWM output control circuits and the control terminal of switch tube driving circuit and switching tube.
The main control chip is SG3525, and drive circuit uses TLP250 driving chips.
A kind of chopping depressuring circuit for implementing above-mentioned control method, including input port, switching tube, PWM waveform output mould
Block and output port, the input port are used to input voltage being input in the chopping depressuring circuit, and the input port leads to
Cross the switching tube and connect the output port, the PWM waveform output module control connects the switching tube.
Also include control module, the input voltage sampling module being arranged at the input port and be arranged on the output
Output voltage sampling module at port, the control module sampling connect the input voltage sampling module and output voltage and adopted
Egf block, control connect the PWM waveform output module.
An inductance is serially connected with connection line between the switching tube and the output port.
One is connected between input port and the GND end to be made up of the first diode and the second diodes in reverse series
Series arm.
Be connected with a resistance between the output end of the input port and the PWM waveform output module, the resistance with
3rd diodes in parallel.
The 4th diode, the output port are connected between the tie point and GND ends of the switching tube and the inductance
A parallel branch is connected between GND ends, the parallel branch is made up of two electric capacity parallel connections.
Voltage-stabilizing protection control method of the invention based on chopping depressuring circuit, according to collection input voltage value and target voltage
Compare, PWM waveform Duty ratio control is exported by the G poles of switch tube, the break-make FREQUENCY CONTROL of MOSFET pipes is realized, so as to real
The pressure regulation effect of existing output voltage；Output voltage is acquired, adjusts, remains in time when load changes
Stable output target voltage；Simultaneously in the case where input voltage exceeds target voltage, MOSFET pipes are turned off in time, play protection
The effect of circuit.The circuit and its control method can realize low cost, the function of power protection of high reliability, by precisely adopting
Sample and rationally control, supporting suitable inductance capacitance, reach the purpose for realizing power supply adjustment and safeguard protection.
Brief description of the drawings
Fig. 1 is the loop control theory figure of existing BUCK circuits；
Fig. 2 is the chopping depressuring circuit of the present invention；
Fig. 3 is the control logic figure of voltage-stabilizing protection control method of the present invention；
Fig. 4 is the voltage oscillogram of control port collection.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described further specific embodiment.
The circuit theory diagrams of chopping depressuring circuit embodiments of the present invention are illustrated in figure 2, as seen from the figure, the main circuit is main
By power switch pipe Q2, PWM output control circuit, control chip, input voltage sample circuit, output voltage sampling circuit, Xiao
Special based diode D1~D5, filter capacitor C1~C2, inductance L, resistance R compositions.
Input voltage is input in the chopping depressuring circuit by input port, input port connecting valve pipe Q2 D poles, is opened
The S poles for closing pipe Q2 are connected to output port, PWM output control circuits control connecting valve pipe Q2.Input voltage sampling module
It is arranged at input port, output voltage sampling module is arranged at output port, and control chip sampling connects the input voltage
Sampling module and output voltage sampling module, control connection PWM output control circuits.
In addition, being connected with a series arm between input port and GND ends, the series arm is by diode D1 and two poles
Pipe D2 is reversely connected in series to form；Resistance R, resistance R and diode are connected between the output end of input port and PWM output control circuits
D5 is in parallel.Tandem electric inductance L on connection line between switching tube Q2 S poles and output port, switching tube Q2 S poles and GND ends
Between be connected with diode D4, series diode D3 between inductance L and output port, the connection between inductance L and diode D3
A parallel branch is connected between point and GND ends, the parallel branch is made up of electric capacity C1 and C2 parallel connection.
The basic parameter of this circuit is that input is 36V lead-acid accumulators, and it is 10A constant currents that output, which requires, and switching frequency is
50kHz；Control chip uses SG3525, and driving chip uses TLP250；Accessory power supply is using flyback (control chip, driving core
It is not shown in piece and accessory power supply figure).It is an important step that main circuit, which selects suitable closed-loop parameters, suitable closed-loop parameters
Circuit stability can be made, produce less EMD.
The circuit is before D levels through input sampling circuit sampled input voltage to main control chip, the sampling purpose of input port
It is the difference in order to calculate input voltage with set voltage；The S poles of MOSFET pipes are connected to late-class circuit, by inductance and electric capacity,
It is output to load circuit；In S, extremely termination exports sampling circuit samples output voltage to main control chip afterwards simultaneously, by precisely sampling
And rationally control, supporting suitable inductance capacitance, reach the purpose for realizing power supply adjustment and safeguard protection.
As shown in figure 3, the step of voltage-stabilizing protection control method of the present invention based on chopping depressuring circuit, is as follows：
(1) input voltage of circuit is sampled, and the input sample voltage and the target voltage of output end is carried out
Contrast, if input sample voltage be not more than target voltage, controlling switch pipe often effectively exports, it is on the contrary then according to input voltage and
The difference of target voltage, the control pole output PWM waveform of switch tube, controlling switch pipe export according to corresponding proportion, will be defeated
Go out voltage to control to target voltage；
After the input voltage vin of power supply enters circuit, handled by basic power supply, be linked into MOSFET pipes Q2 D poles,
Input voltage value is measured through input sampling circuit, main control chip contrasts to the input voltage of collection with target voltage, calculates
Ratio, by a PWM output control circuit, output PWM waveform is to the G poles of controllable MOSFET pipes, by changing Gate ports
Pulse duty factor (voltage change) break-make of MOSFET pipes is controlled (as shown in Figure 4), response is rapid, defeated so as to realize
Go out the pressure regulation effect of voltage, while in the case where input voltage exceeds setting value, turn off MOSFET pipes in time, play protection electricity
The effect on road.
(2) output voltage of circuit is sampled, and the output sampled voltage and the target voltage of output end is carried out
Contrast, if output sampled voltage is not less than target voltage, according to the difference of input voltage and target voltage, the control of switch tube
Pole processed exports PWM waveform, and controlling switch pipe exports according to corresponding proportion, so that output voltage is less than target voltage.
The output voltage of rear end collection can gather output voltage shape in time equivalent to feedback when load changes
State, and be adjusted according to the voltage change of load end, remain voltage (the target electricity that can stablize output setting value
Pressure), to adapt to various load states.
Automobile-used High-reliability power source circuit provided by the invention and its control method by changing the conduction ratio of switching device,
The size of output voltage and electric current can be efficiently controlled, plays adjustment voltage, anti-transient impact, the work of protection power source circuit
With.
Above example is only used for helping the core concept for understanding the present invention, it is impossible to the present invention is limited with this, for ability
The technical staff in domain, every thought according to the present invention, the present invention is modified or equivalent substitution, in embodiment
And any change done in application, it should be included in the scope of the protection.
Claims (10)
- A kind of 1. voltage-stabilizing protection control method based on chopping depressuring circuit, it is characterised in that：The step of this method, is as follows：(1) input voltage of circuit is sampled, and the target voltage of the input sample voltage and output end is contrasted, If input sample voltage is not more than target voltage, controlling switch pipe often effectively exports, it is on the contrary then according to input voltage and target The difference of voltage, the control pole output PWM waveform of switch tube, controlling switch pipe export according to corresponding proportion, will output electricity It is voltage-controlled to make to target voltage；(2) output voltage of circuit is sampled, and the target voltage of the output sampled voltage and output end is contrasted, If output sampled voltage is not less than target voltage, according to the difference of input voltage and target voltage, the control pole of switch tube PWM waveform is exported, controlling switch pipe exports according to corresponding proportion, so that output voltage is less than target voltage.
- 2. the voltage-stabilizing protection control method according to claim 1 based on chopping depressuring circuit, it is characterised in that：Copped wave is dropped Volt circuit is sampled by input voltage sample circuit and output voltage sampling circuit to input voltage, output voltage respectively.
- 3. the voltage-stabilizing protection control method according to claim 2 based on chopping depressuring circuit, it is characterised in that：Input electricity Pressure sample circuit and output voltage sampling circuit are connected with main control chip, and the output end of the main control chip is exported by PWM Control circuit and the connection of the control terminal of switch tube driving circuit and switching tube.
- 4. the voltage-stabilizing protection control method according to claim 3 based on chopping depressuring circuit, it is characterised in that：The master Control chip is SG3525, and drive circuit uses TLP250 driving chips.
- 5. a kind of chopping depressuring circuit for implementing the voltage-stabilizing protection control method based on chopping depressuring circuit described in claim 1, It is characterized in that：Including input port, switching tube, PWM waveform output module and output port, the input port is used for will be defeated Enter control source into the chopping depressuring circuit, the input port connects the output port by the switching tube, described The control of PWM waveform output module connects the switching tube.
- 6. chopping depressuring circuit according to claim 5, it is characterised in that：Also include control module, be arranged on it is described defeated Input voltage sampling module and the output voltage sampling module being arranged at the output port, the control mould at inbound port Block sampling connects the input voltage sampling module and output voltage sampling module, and control connects the PWM waveform output module.
- 7. chopping depressuring circuit according to claim 6, it is characterised in that：Between the switching tube and the output port Connection line on be serially connected with an inductance.
- 8. chopping depressuring circuit according to claim 7, it is characterised in that：Connected between input port and the GND end There is a series arm being made up of the first diode and the second diodes in reverse series.
- 9. chopping depressuring circuit according to claim 8, it is characterised in that：The input port and the PWM waveform are defeated Go out between the output end of module and be connected with a resistance, the resistance and the 3rd diodes in parallel.
- 10. chopping depressuring circuit according to claim 9, it is characterised in that：The connection of the switching tube and the inductance The 4th diode is connected between point and GND ends, a parallel branch is connected between output port and the GND end, this is simultaneously Join branch and route two electric capacity composition in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510695007.4A CN105196878B (en) | 2015-10-22 | 2015-10-22 | Voltage-stabilizing protection control method and chopping depressuring circuit based on chopping depressuring circuit |
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| CN201510695007.4A CN105196878B (en) | 2015-10-22 | 2015-10-22 | Voltage-stabilizing protection control method and chopping depressuring circuit based on chopping depressuring circuit |
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| CN106685234B (en) * | 2017-02-09 | 2023-10-17 | 百色学院 | Voltage-reducing type direct-current switch voltage-stabilizing power supply and voltage-stabilizing control method |
| CN107623448A (en) * | 2017-09-22 | 2018-01-23 | 深圳市元科技股份有限公司 | A kind of chopped mode voltage conversion controller |
| CN112165239B (en) * | 2020-09-17 | 2022-02-22 | 苏州浪潮智能科技有限公司 | Voltage regulation method and device of step-down switching circuit |
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| US8232679B2 (en) * | 2003-02-25 | 2012-07-31 | Eaton Corporation | Uninterruptible power supplies with converter operation conditioned upon static switch commutation and methods of operation thereof |
| CN101425747A (en) * | 2007-10-29 | 2009-05-06 | 思柏科技股份有限公司 | Electric power supply device having voltage conversion circuit |
| CN102916205A (en) * | 2011-08-05 | 2013-02-06 | 全琎 | Energy-controllable output device for fuel cell and control method |
| CN104734512B (en) * | 2013-12-23 | 2018-01-02 | 武汉众宇动力系统科技有限公司 | A kind of fuel cell DC/DC converting means and its control method |
| CN104319829A (en) * | 2014-09-30 | 2015-01-28 | 陕西易阳科技有限公司 | Solar charging system |
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Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co.,Ltd. Address before: 450016 Yutong Industrial Zone, eighteen Li River, Henan, Zhengzhou Patentee before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
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