CN210201742U - Multi-path synchronous PWM current controller - Google Patents
Multi-path synchronous PWM current controller Download PDFInfo
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- CN210201742U CN210201742U CN201921299971.5U CN201921299971U CN210201742U CN 210201742 U CN210201742 U CN 210201742U CN 201921299971 U CN201921299971 U CN 201921299971U CN 210201742 U CN210201742 U CN 210201742U
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Abstract
The multi-path synchronous PWM current controller comprises a plurality of paths of current feedback signals, and each path of current feedback signal and a carrier signal are used as input signals of a corresponding 1-comparator; 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 the fundamental wave pulse width controller and is compared with a current set value in the fundamental wave pulse width controller, and an output signal of the fundamental wave pulse width controller and a fundamental wave signal 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; 2, taking the output signal of the comparator and the output signal of the 3-comparator as input signals of the fundamental wave 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 utility model belongs to the technical field of pulse control, concretely relates to synchronous PWM current controller of multichannel.
Background
Switching power supplies have emerged as an alternative to linear regulated power supplies, and their applications and implementations have grown increasingly mature. And the integration technology makes electronic equipment develop towards miniaturization, intelligent direction, and novel electronic equipment requires that switching power supply has littleer volume and lower noise interference to realize integrated 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 the switching power supply, the single-path high-power and ultra-high-power pulse power supply is difficult to be made, a plurality of switching power supplies have to be connected in parallel according to the topological structure, and the multi-path synchronization and current sharing control are ensured.
The switching power supply generally includes a Pulse Width Modulation (PWM) control ic (integrated circuit) and a power device (power MOSFET or IGBT), and meets three conditions: switching (devices operating in a switching nonlinear state), high frequency (devices operating at a low frequency other than near the upper frequency), and current (power output dc or ac).
The pulse electroplating industry needs a pulse electroplating power supply of 12V 10000A. Rated output power 120 KW. The prior art is a single-path high-power PWM switching power supply manager, which generally works at 20KHz, and when the input voltage is 380V, the output voltage is 12V, and the maximum power output voltage is 30-40 KVA. Namely, the power of the existing single-path high-power PWM switching power supply manager can not meet the requirement of the pulse electroplating industry.
Disclosure of Invention
In order to overcome the defects existing in the prior art, the utility model provides a multichannel synchronous PWM current controller which is suitable for a low-voltage heavy current power supply, has simple circuit and strong interference resistance.
The utility model adopts the technical proposal that:
multichannel synchronous PWM current controller, its characterized in that: the device comprises a fundamental wave signal, a carrier signal, a multi-channel current feedback signal, a fundamental wave pulse width modulator, a carrier 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 a carrier signal are used as input signals of a corresponding 1-comparator;
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 an output signal of the fundamental wave pulse width controller and a fundamental wave signal 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 wave pulse width modulator;
and the output signal of the fundamental wave pulse width modulator and the output of each path of 1-comparator are the modulation pulse width output signals of the corresponding path. The utility model compares each current feedback signal with the carrier signal output signal, finely adjusts the carrier pulse width, and controls each output current to be flow equalized; and (4) comparing the superposed output of each current feedback signal with a current set value, adjusting the pulse width of the fundamental wave, and obtaining the superposition of each output current to reach the set current value. The power supply is suitable for low-voltage large-current power supplies; and the circuit is simple, and the external matched resistance-capacitance elements are few.
Further, the current feedback signal takes 0-4V output by the current sensor as an input signal.
Further, the carrier signal is a carrier triangular 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 modulation carrier pulse width signal.
Further, the output of the signal adder is larger than a current set value, and the fundamental wave pulse width duty ratio is reduced; the output of the signal adder is less than the current set value, and the fundamental wave pulse width duty ratio is increased.
Further, when the current feedback signal of the carrier pulse width limiter is 0V, the output of the 3-comparator limits the maximum pulse width of the carrier to 88% duty ratio.
Further, the fundamental wave signal is a fundamental wave triangular wave signal.
Further, the frequency range of the carrier signal is 40-60 KHz.
Further, the frequency range of the fundamental wave signal is 400-2000 Hz.
The utility model has the advantages that: the power supply is suitable for low-voltage large-current power supplies; the circuit is simple, and the number of externally matched resistance-capacitance elements is small; the current feedback is input into a matched current sensor to achieve a 0-4V output standard; the carrier signal of 40-60KHz can be set by self; the fundamental wave signal 400-2000Hz can be set by self; the single-path modulation pulse outputs all contain 3 signals, and two paths of H-bridge drive outputs; enabling one path; the power supply voltage is 9-18V, and the anti-interference performance is high; the working temperature of the device is +80 degrees to-40 degrees, and the industrial standard is adopted.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Fig. 2 is a schematic waveform diagram of the carrier signal according to the present invention.
Fig. 3 is a schematic waveform diagram of the fundamental wave signal of the present invention.
FIG. 4 is a schematic diagram of the waveform of the modulation pulse width output of the present invention
Detailed Description
The present invention will be further described with reference to the following specific embodiments, but the present invention is not limited to these specific embodiments. It will be recognized by those skilled in the art that the present 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, wherein a multi-channel pulse power supply implements parallel synchronous control and method, and the extended power output is more than 200KVA, and 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 modulation pulse width output signal 12.
Each path of the current feedback signal 4 and the carrier signal 2 are used as input signals of a corresponding 1-comparator 7; wherein, the current feedback signal 4 is an input signal of 0-4V output by the current sensor; the carrier signal 2 is a carrier triangular wave signal, the frequency range of the carrier signal 2 is 40-60KHz, and the specific waveform can be shown in FIG. 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 modulation carrier pulse width signal, so that the current sharing control of each path of output current is realized;
each current feedback signal 4 of the present embodiment 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; wherein, 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 the specific waveform can be shown in fig. 3; after being superposed, each path of current feedback signal 4 is output and compared with a current set value 9, the output of the current feedback signal is compared with a fundamental wave triangular wave signal, and the fundamental wave pulse width is adjusted; the output of the signal adder 5 is larger than the current set value, and the fundamental wave pulse width duty ratio is reduced; the output of the signal adder 5 is less than the current set value, and the fundamental wave pulse width duty ratio is increased.
The output signal of the carrier pulse width limiter 10 and the carrier signal 2 in this embodiment are used as the input signals of the 3-comparator 8; the carrier pulse width limiter 10 limits the carrier maximum pulse width to 88% duty cycle at the output of the 3-comparator 8 when the current feedback signal 4 is 0V.
The output signal of the 2-comparator 6 and the output signal of the 3-comparator 8 described in this embodiment serve as input signals of the fundamental wave pulse width modulator 11.
In this embodiment, the output signal of the fundamental wave pulse-width modulator 11 and the output signal of each path of the 1-comparator 7 are used as input signals of a corresponding and gate, the output signal of each path of the and gate is a corresponding path of the modulated pulse-width output signal 12, and waveforms of the modulated pulse-width output signals are shown in fig. 4. And 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 train, and the fundamental wave is a pulse train envelope line. Until the pulse width output signals of all paths are driven to enable the output superposition of the current sensor to reach the current set value.
In the embodiment, the comparators, 2-comparator 6, 1-comparator 7 and 3-comparator 8 in the fundamental wave pulse width controller 3 all adopt voltage comparators LM 293; the signal adder 5 adopts an amplifier LM 258; the AND gate in the fundamental wave pulse width modulator 11, the AND gate for AND-ing the modulated fundamental wave signal 1 and each path of modulated carrier signal 2 adopt a two-input AND gate CD 4081; the fundamental wave signal and the carrier wave signal are both output by a ring oscillator composed of inverters CD 4069.
In the embodiment, two H bridge 20KHz driving signals can be obtained by performing frequency division on one-way modulation pulse output, and the envelope line of the pulse train is two H bridge enabling signals. So the single modulation pulse output contains 3 kinds of signals. In order to improve the signal transmission anti-interference, the single-path modulation pulse output signal is demodulated into 3 signal functions and is combined into the IGBT driving circuit.
The utility model compares each current feedback signal with the output signal of the carrier signal, finely adjusts the carrier pulse width, and controls each output current to be flow equalized; each path of current feedback signal superposition output is compared with a current set value, the fundamental wave pulse width is adjusted, and set current output is obtained, so that the method is suitable for a low-voltage large-current power supply; and the circuit is simple, and the external matched resistance-capacitance elements are few.
The multi-path synchronous PWM current mode switching power supply manager described in this embodiment is a core component of the multi-path switching power supply in parallel. It is followed by an IGBT drive, a high-power IGBT power tube and a high-power high-frequency transformer. The output of the multi-path high-power switching power supply is connected in parallel to form an ultra-high-power pulse power supply.
Claims (9)
1. Multichannel synchronous PWM current controller, its characterized in that: the device comprises a fundamental wave signal, a carrier signal, a multi-channel current feedback signal, a fundamental wave pulse width modulator, a carrier pulse width limiter, a fundamental wave pulse width controller and a multi-channel modulation pulse width output;
each path of current feedback signal and a carrier signal are used as input signals of a corresponding 1-comparator;
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 an output signal of the fundamental wave pulse width controller and a fundamental wave signal 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 wave pulse width modulator;
and the output signal of the fundamental wave pulse width modulator and the output signal of each path of 1-comparator are used as the modulation pulse width output signal of each path.
2. The multiple-synchronous PWM current controller according to claim 1, wherein: the current feedback signal takes 0-4V output by the current sensor as an input signal.
3. The multiple-synchronous PWM current controller according to claim 1, wherein: the carrier signal is a carrier triangular wave signal.
4. The multiple-synchronous PWM current controller according to claim 3, wherein: when the current feedback signal in the 1-comparator is larger 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 modulation carrier pulse width signal.
5. The multiple synchronous PWM current controller according to any one of claims 1 to 4, wherein: the output of the signal adder is larger than the current set value, and the fundamental wave pulse width duty ratio is reduced; the output of the signal adder is less than the current set value, and the fundamental wave pulse width duty ratio is increased.
6. The multiple-synchronous PWM current controller according to claim 1, wherein: when the current feedback signal of the carrier pulse width limiter is 0V, the output of the 3-comparator limits the maximum pulse width of the carrier to 88% of duty ratio.
7. The multiple-synchronous PWM current controller according to claim 1, wherein: the fundamental wave signal is a fundamental wave triangular wave signal.
8. The multiple-synchronous PWM current controller according to claim 1, wherein: the frequency range of the carrier signal is 40-60 KHz.
9. The multiple-synchronous PWM current controller according to claim 1, wherein: the frequency range of the fundamental wave signal is 400-2000 Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921299971.5U CN210201742U (en) | 2019-08-12 | 2019-08-12 | Multi-path synchronous PWM current controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921299971.5U CN210201742U (en) | 2019-08-12 | 2019-08-12 | Multi-path synchronous PWM current controller |
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| CN210201742U true CN210201742U (en) | 2020-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429853A (en) * | 2019-08-12 | 2019-11-08 | 田云 | Multi-path synchronous PWM current controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429853A (en) * | 2019-08-12 | 2019-11-08 | 田云 | Multi-path synchronous PWM current controller |
| CN110429853B (en) * | 2019-08-12 | 2024-06-21 | 田云 | Multipath synchronous PWM current controller |
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Granted publication date: 20200327 Effective date of abandoning: 20240621 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200327 Effective date of abandoning: 20240621 |