CN110429853B - Multipath synchronous PWM current controller - Google Patents
Multipath synchronous PWM current controller Download PDFInfo
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- CN110429853B CN110429853B CN201910740564.1A CN201910740564A CN110429853B CN 110429853 B CN110429853 B CN 110429853B CN 201910740564 A CN201910740564 A CN 201910740564A CN 110429853 B CN110429853 B CN 110429853B
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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Abstract
The multipath synchronous PWM current controller comprises multipath current feedback signals, wherein each path of current feedback signal and a carrier signal are used as input signals of corresponding 1-comparators; each path of current feedback signal is connected with the input end of the signal adder, the output end of the signal adder is connected with the input end of the fundamental wave pulse width controller and is compared with a current set value in the fundamental wave pulse width controller, and the output signal of the fundamental wave pulse width controller and the fundamental wave signal are used as input signals of the 2-comparator; the output signal of the carrier pulse width limiter and the carrier signal are used as input signals of the 3-comparator; the output signal of the 2-comparator and the output signal of the 3-comparator are used as input signals of the fundamental pulse width regulator; the output signal of the fundamental wave pulse width regulator and the output signal of each path of 1-comparator are used as the input signals of the corresponding AND gates, and the output signal of each path of AND gates is the modulation pulse width output signal of the corresponding path.
Description
Technical Field
The invention belongs to the technical field of pulse control, and particularly relates to a multipath synchronous PWM current controller.
Background
Switching power supplies are emerging as an alternative to linear regulated power supplies, with increasingly sophisticated applications and implementations. The integration technology enables the electronic equipment to develop towards miniaturization and intellectualization, and the novel electronic equipment requires a smaller volume and lower noise interference of the switching power supply so as to realize integration. However, in the application field of high-power and ultra-high-power pulse power supplies, due to the power limitation of a high-frequency transformer of a switching power supply, a single-path high-power and ultra-high-power pulse power supply is difficult to manufacture, a plurality of switching power supplies are connected in parallel according to the topological structure of the single-path high-power and ultra-high-power pulse power supply, and multi-path synchronization and current sharing control are guaranteed.
Switching power supplies are generally composed of pulse width modulation (PWM, pulse Width Modulation) control IC (Integrated Circuit) and power devices (power MOSFETs or IGBTs) and meet three conditions: switches (devices operate in a non-linear state of the switch), high frequencies (devices operate at high frequencies other than low frequencies near the upper frequency), and currents (power output dc or ac).
The pulse plating power supply 12V 10000A is required by the pulse plating industry. Rated output power 120KW. The prior art is a single-path high-power PWM switching power supply manager which generally works at 20KHz, and when 380V is input, 12V is output, and the maximum power output is 30-40KVA. The power of the existing single-channel high-power PWM switching power supply manager cannot meet the requirements of the pulse plating industry.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the multipath synchronous PWM current controller which is applicable to a low-voltage high-current power supply, has a simple circuit and is high in interference resistance.
The technical scheme adopted by the invention is as follows:
Multipath synchronous PWM current controller, its characterized in that: the device comprises a fundamental wave signal, a carrier wave signal, a multi-channel current feedback signal, a fundamental wave pulse width modulator, a carrier wave pulse width limiter, a fundamental wave pulse width controller and a multi-channel modulation pulse width output signal;
Each path of current feedback signal and carrier signal are used as input signals of corresponding 1-comparators;
Each path of current feedback signal is connected with the input end of a signal adder, the output end of the signal adder is connected with the input end of a fundamental wave pulse width controller and is compared with a current set value on the fundamental wave pulse width controller, and the output signal and the fundamental wave signal of the fundamental wave pulse width controller are used as input signals of a 2-comparator;
The output signal of the carrier pulse width limiter and the carrier signal are used as input signals of a 3-comparator;
The output signal of the 2-comparator and the output signal of the 3-comparator are used as input signals of a fundamental pulse width modulator;
The output signal of the fundamental wave pulse width modulator and the output sum of each path of 1-comparator are the modulation pulse width output signals of the corresponding paths. Comparing each path of current feedback signal with a carrier signal output signal, finely adjusting the carrier pulse width to ensure that each path of output current is subjected to current sharing control; and comparing the superposition output of each path of current feedback signals with a current set value, and adjusting the pulse width of the fundamental wave to obtain the superposition of each path of output current to reach the set current value. The power supply is suitable for a low-voltage high-current power supply; and the circuit is simple, and the number of external matched resistance-capacitance elements is small.
Further, the current feedback signal takes 0-4V output by the current sensor as an input signal.
Further, the carrier signal is a carrier triangle wave signal.
Further, when the current feedback signal in the 1-comparator is greater than the carrier triangular wave signal, the output signal of the 1-comparator is a carrier-free pulse output signal; when the current feedback signal in the 1-comparator is less than the carrier triangular wave signal, the output signal of the 1-comparator is a PWM modulated carrier pulse width signal.
Further, the output of the signal adder is larger than a current set value, and the fundamental pulse width duty ratio is reduced; the output of the signal adder is smaller than the current set value, and the fundamental pulse width duty ratio is increased.
Further, the carrier pulse width limiter limits the carrier maximum pulse width to 88% duty cycle when the current feedback signal is 0V.
Further, the fundamental wave signal is a fundamental wave triangular wave signal.
Further, the carrier signal has a frequency in the range of 40-60KHz.
Further, the frequency of the fundamental wave signal ranges from 400 Hz to 2000Hz.
The invention has the beneficial effects that: the power supply is suitable for a low-voltage high-current power supply; the circuit is simple, and the number of external matched resistance-capacitance elements is small; the current feedback is input to the output standard of the matched current sensor 0-4V; the carrier signal 40-60KHz can be set by itself; the fundamental wave signal 400-2000Hz can be set by oneself; the single-path modulation pulse output contains 3 signals, and the two paths of H-bridge drive output; one path of enabling; the power supply voltage is 9-18V, so that the anti-interference effect is strong; the working temperature of the device is +80 degrees to-40 degrees, and the device is an industrial standard.
Drawings
Fig. 1 is a schematic circuit configuration of the present invention.
Fig. 2 is a waveform diagram of a carrier signal of the present invention.
Fig. 3 is a waveform schematic diagram of the fundamental wave signal of the present invention.
FIG. 4 is a waveform schematic diagram of a modulated pulse width output of the present invention
Detailed Description
The invention will be further illustrated with reference to the following specific examples, without limiting the invention to these specific embodiments. It will be appreciated by those skilled in the art that the invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
Referring to fig. 1, the present embodiment provides a multi-channel synchronous PWM current controller, which is also a multi-channel synchronous PWM current mode switching power supply manager, and the multi-channel pulse power supply realizes parallel synchronous control and method, and the extended power output is more than 200KVA, which includes a fundamental wave signal 1, a carrier wave signal 2, a multi-channel current feedback signal 4, a fundamental wave pulse width modulator 11, a carrier wave pulse width limiter 10, a fundamental wave pulse width controller 3, and a multi-channel modulated pulse width output signal 12.
Each path of current feedback signal 4 and carrier signal 2 are used as input signals of corresponding 1-comparator 7; wherein, the current feedback signal 4 takes 0-4V output by a current sensor as an input signal; the carrier signal 2 is a carrier triangular wave signal, the frequency range of the carrier signal 2 is 40-60KHz, and specific waveforms are shown in figure 2; when the current feedback signal in the 1-comparator 7 is greater than the carrier triangular wave signal, the output signal of the 1-comparator 7 is a carrier pulse-free output signal; when the current feedback signal in the 1-comparator 7 is less than the carrier triangular wave signal, the output signal of the 1-comparator is a PWM modulated carrier pulse width signal, so that the output current of each path is controlled in a uniform flow manner;
Each path of current feedback signal 4 is connected with an input end of a signal adder 5, an output end of the signal adder 5 is connected with an input end of a fundamental wave pulse width controller 3 and is compared with a current set value 9 on the fundamental wave pulse width controller 3, and an output signal of the fundamental wave pulse width controller 3 and a fundamental wave signal 1 are used as input signals of a 2-comparator 6; the fundamental wave signal 1 is a fundamental wave triangular wave signal, the frequency range of the fundamental wave signal 1 is 400-2000Hz, and specific waveforms are shown in figure 3; the output of each current feedback signal 4 is compared with a current set value 9 after superposition, and the output of each current feedback signal is compared with a fundamental wave triangular wave signal to adjust the pulse width of a fundamental wave; the output of the signal adder 5 is larger than a current set value, and the fundamental pulse width duty ratio is reduced; the output of the signal adder 5 is smaller than the current set value, and the fundamental pulse width duty ratio is increased.
The output signal of the carrier pulse width limiter 10 and the carrier signal 2 are used as input signals of the 3-comparator 8; the carrier pulse width limiter 10 limits the carrier maximum pulse width to 88% duty cycle at 0V for the current feedback signal 4.
The output signal of the 2-comparator 6 and the output signal of the 3-comparator 8 in this embodiment are used as input signals of the fundamental pulse width modulator 11.
In this embodiment, the output signal of the fundamental pulse width modulator 11 and the output signal of each path of 1-comparator 7 are used as input signals of corresponding and gates, and the output signal of each path of and gate is a modulated pulse width output signal 12 of a corresponding path, and the waveform of the modulated pulse width output signal is shown in fig. 4. The modulated fundamental wave signal 1 and each path of modulated carrier wave signal 2 are subjected to AND operation to obtain each path of modulated carrier wave pulse string, and the fundamental wave is a pulse string envelope curve. And until the output of each pulse width output signal drive makes the output of the current sensor be overlapped to reach a current set value.
The comparators of the fundamental pulse width controller 3, the 2-comparator 6, the 1-comparator 7 and the 3-comparator 8 in the embodiment all adopt voltage comparators LM293; the signal adder 5 adopts an amplifier LM258; the AND gates in the fundamental pulse width modulator 11, the modulated fundamental wave signal 1 and the modulated carrier wave signals 2 are all AND gates with two inputs and gates CD4081; the fundamental and carrier signals are ring oscillators consisting of inverters CD4069 to produce an output.
In this embodiment, the single-channel modulation pulse output is divided once to obtain two channels of H-bridge 20KHz driving signals, and the pulse train envelope is two channels of H-bridge enabling signals. So said single modulated pulse output contains 3 signals. In order to improve signal transmission anti-interference, 3 signal functions of demodulating a single-channel modulation pulse output signal are combined into an IGBT driving circuit.
Comparing each path of current feedback signal with the output signal of the carrier signal, finely adjusting the carrier pulse width to ensure that each path of output current is subjected to current sharing control; the superposition output of each current feedback signal is compared with a current set value, the pulse width of fundamental wave is regulated, the set current output is obtained, and the method is applicable to a low-voltage heavy-current power supply; and the circuit is simple, and the number of external matched resistance-capacitance elements is small.
The multi-path synchronous PWM current mode switching power supply manager is a multi-path switching power supply parallel core component. It is followed by IGBT drive, high power IGBT power tube, high power high frequency transformer. The outputs of the multiple high-power switch power supplies are connected in parallel to form an ultra-high-power pulse power supply.
Claims (6)
1. Multipath synchronous PWM current controller, its characterized in that: the device comprises a fundamental wave signal, a carrier wave signal, a multi-channel current feedback signal, a fundamental wave pulse width modulator, a carrier wave pulse width limiter, a fundamental wave pulse width controller and a multi-channel modulation pulse width output;
Each path of current feedback signal and carrier signal are used as input signals of corresponding 1-comparators;
Each path of current feedback signal is connected with the input end of a signal adder, the output end of the signal adder is connected with the input end of a fundamental wave pulse width controller and is compared with a current set value on the fundamental wave pulse width controller, and the output signal and the fundamental wave signal of the fundamental wave pulse width controller are used as input signals of a 2-comparator;
The output signal of the carrier pulse width limiter and the carrier signal are used as input signals of a 3-comparator;
The output signal of the 2-comparator and the output signal of the 3-comparator are used as the output signal of the fundamental pulse width modulator;
the output signal of the fundamental wave pulse width modulator, the output signal of each path of 1-comparator and the output signal of each path of 1-comparator are used as modulation pulse width output signals of each path;
The carrier signal is a carrier triangular wave signal; when the current feedback signal in the 1-comparator is greater than the carrier triangular wave signal, the output signal of the 1-comparator is a carrier pulse-free output signal; when the current feedback signal in the 1-comparator is less than the carrier triangular wave signal, the output signal of the 1-comparator is a PWM modulated carrier pulse width signal;
The output of the signal adder is larger than a current set value, and the fundamental pulse width duty ratio is reduced; the output of the signal adder is smaller than the current set value, and the fundamental pulse width duty ratio is increased.
2. The multi-path synchronous PWM current controller of claim 1, wherein: the current feedback signal takes 0-4V output by the current sensor as an input signal.
3. The multi-path synchronous PWM current controller of claim 1, wherein: the carrier pulse width limiter limits the carrier maximum pulse width to 88% duty cycle when the current feedback signal is 0V.
4. The multi-path synchronous PWM current controller of claim 1, wherein: the fundamental wave signal is a fundamental wave triangular wave signal.
5. The multi-path synchronous PWM current controller of claim 1, wherein: the carrier signal has a frequency range of 40-60KHz.
6. The multi-path synchronous PWM current controller of claim 1, wherein: the frequency range of the fundamental wave signal is 400-2000Hz.
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| JP3185257B2 (en) * | 1991-07-23 | 2001-07-09 | 株式会社明電舎 | Power conversion unit parallel operation device |
| JP4576970B2 (en) * | 2004-01-06 | 2010-11-10 | 株式会社明電舎 | Pulse width modulation inverter device and control method thereof |
| KR101912936B1 (en) * | 2011-11-08 | 2018-10-30 | 엘지디스플레이 주식회사 | Apparatus for controlling constant current for multi-channel led and liquid crystal display using the same |
| KR101623701B1 (en) * | 2014-07-31 | 2016-05-24 | 어보브반도체 주식회사 | Method and apparatus for multi channel current driving |
| CN104439621B (en) * | 2014-11-05 | 2016-08-31 | 深圳华意隆电气股份有限公司 | One becomes more meticulous Multifunctional welding welding system and control method thereof |
| CN104852601A (en) * | 2015-05-27 | 2015-08-19 | 广西大学 | Cascaded multi-level power electronic transformer based on DSP (Digital Signal Processor)/FPGA (Field Programmable Gate Array) cooperative control |
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