CN110719022A - Sampling feedback circuit, sampling feedback method and inverter system - Google Patents

Sampling feedback circuit, sampling feedback method and inverter system Download PDF

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Publication number
CN110719022A
CN110719022A CN201911002396.2A CN201911002396A CN110719022A CN 110719022 A CN110719022 A CN 110719022A CN 201911002396 A CN201911002396 A CN 201911002396A CN 110719022 A CN110719022 A CN 110719022A
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China
Prior art keywords
feedback
sampling
module
feedback module
output
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余伟亮
曾云洪
杨军
陈金奇
程义
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters

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  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a sampling feedback circuit, a sampling feedback method and an inverter system. Wherein, this circuit includes: the input end of the sampling module is connected with the first end of the direct current bus, and the output end of the sampling module is connected with the first end of the feedback module; and the second end of the feedback module is connected with the second end of the direct current bus, the third end of the feedback module is connected with a ground wire, and the fourth end of the feedback module is connected with the PWM control circuit. The sampling module and the feedback module act together to replace the original voltage transformer, and the sampling module and the feedback module have smaller volumes, so that the internal space of the system can be saved, and the cost can be reduced.

Description

Sampling feedback circuit, sampling feedback method and inverter system
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a sampling feedback circuit, a sampling feedback method and an inverter system.
Background
With the rapid development of science and technology, people have higher and higher requirements on the safety, stability and the like of a high-power supply, so that the application of a feedback circuit is emphasized. In a switching power supply DC/DC boost converter, a current feedback circuit and a voltage feedback circuit are added to the system in order to stabilize the output. In a high-voltage output system, a voltage transformer is generally adopted to sample an alternating current bus, a low-voltage signal is output through the voltage transformer and is input to a feedback output end of a PWM (pulse-width modulation) wave control chip as a feedback signal, and then output voltage regulation is performed. The method can realize high-precision adjustment. However, the voltage transformer is a step-down transformer, and the number of primary windings is greater than that of secondary windings. Therefore, the voltage transformer is adopted to sample the voltage, the manufacturing cost is high, and the voltage transformer is adopted to sample the voltage, so that the occupied space is large.
The problem that a voltage transformer occupies a large space when sampling and feedback are performed by adopting the voltage transformer in the prior art is solved.
Disclosure of Invention
The embodiment of the invention provides a sampling feedback circuit, a sampling feedback method and an inverter system, and aims to solve the problem that a voltage transformer is adopted for sampling in the prior art, so that the occupied space is large.
In order to solve the technical problem, the invention provides a space-saving sampling feedback circuit, a sampling feedback method and an inverter system, wherein the circuit comprises:
the input end of the sampling module is connected with the first end of the direct current bus, and the output end of the sampling module is connected with the first end of the feedback module;
and the second end of the feedback module is connected with the second end of the direct current bus, the third end of the feedback module is connected with a ground wire, and the fourth end of the feedback module is connected with the PWM control circuit.
Further, the sampling module includes:
the first pole of the voltage stabilizing source is connected with a first connecting point on the direct current bus, the second pole of the voltage stabilizing source is connected with a grounding wire, a first resistor is connected between the first connecting point and the grounding wire, and the third pole of the voltage stabilizing source is connected with the feedback module.
Furthermore, a second resistor is connected in series between the sampling module and the first end of the direct current bus.
Further, the feedback module includes:
the photoelectric coupling module is connected with the third resistor in parallel and then is connected between the output end of the sampling module and the second end of the direct current bus.
Further, a fourth resistor is connected in series between the second end of the feedback module and the second end of the direct current bus.
In some embodiments, the circuit further comprises:
and the input end of the voltage stabilizing module is connected with the second end of the feedback module, and the output end of the voltage stabilizing module is connected with the second end of the direct current bus.
Further, the voltage stabilization module includes:
and the anode of the diode is connected with the second end of the feedback module, and the cathode of the diode is connected with the second end of the direct current bus.
Furthermore, a first capacitor is connected between the first end of the feedback module and the first end of the direct current bus.
The invention also provides an inverter system which is characterized by comprising the sampling feedback circuit.
The invention also provides a sampling feedback method, wherein the method comprises the following steps:
acquiring a sampling signal;
controlling feedback signal output according to the sampling signal;
and outputting an output waveform for controlling the PWM control circuit according to the feedback signal.
Further, controlling the feedback signal output according to the sampling signal comprises:
determining the input current of a feedback module according to the sampling signal; wherein the sampling signal is a voltage signal.
And controlling the output current of the feedback module according to the input current.
Further, determining an input current of a feedback module according to the sampling signal comprises:
the larger the sampling signal is, the larger the input current of the feedback module is;
the smaller the sampling signal, the smaller the input current of the feedback module.
Further, outputting an output waveform for controlling the PWM control circuit according to the feedback signal, includes:
and controlling the output waveform of the PWM control circuit according to the change condition of the output current of the feedback module.
Further, controlling the output waveform of the PWM control circuit according to the variation of the output current of the feedback module includes:
if the output current of the feedback module is increased, controlling the duty ratio of the output waveform of the PWM control circuit to be reduced;
if the output current of the feedback module is reduced, controlling the duty ratio of the output waveform of the PWM control circuit to be increased;
and if the output current of the feedback module is unchanged, controlling the duty ratio of the output waveform of the PWM control circuit to be unchanged.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the above sampling feedback method.
By applying the technical scheme of the invention, voltage signal acquisition is realized through the sampling module, the signal output by the sampling module is input to the input end of the PWM control circuit through the feedback module, so that the output waveform of the PWM control circuit is controlled, the voltage of a direct current bus is controlled to rise and fall, and the purpose of voltage stabilization is realized.
Drawings
FIG. 1 is a block diagram of a sampling feedback circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a sampling feedback circuit according to another embodiment of the present invention;
FIG. 3 is a block diagram of a sampling feedback circuit according to yet another embodiment of the present invention;
fig. 4 is a connection diagram of a sampling feedback circuit in an inverter system according to an embodiment of the present invention;
fig. 5 is a flow chart of a sampling feedback method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the resistors in the embodiments of the present invention, the resistors should not be limited to these terms. These terms are only used to distinguish between different resistances. For example, a first resistance may also be referred to as a second resistance, and similarly, a second resistance may also be referred to as a first resistance, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
This embodiment provides a sampling feedback circuit, and fig. 1 is a structural diagram of the sampling feedback circuit according to an embodiment of the present invention, as shown in fig. 1, the sampling feedback circuit includes:
sampling module 12, the first end of direct current bus 11 is connected to the input for obtain the voltage of direct current bus 11, sampling signal promptly, the first end of feedback module 13 is connected to the output, feedback module 13, including input side and output side, the input side includes: first end and second end, the output side includes: the output signal of the sampling module 12 is an input signal of an input side of the feedback module 13, the second end of the feedback module 13 is connected to the second end of the dc bus 11, the input signal of the input side returns to the second end of the dc bus 11 after passing through the feedback module 13 and is used as an input signal of the input side of the feedback module 13, a ground line of the third end of the feedback module 13 enables the output side of the feedback module 13 to form a closed loop, and the fourth end is connected to the PWM control circuit 14 and is used for outputting a feedback signal to the PWM control circuit 14.
Sampling module 12 obtains the voltage signal of direct current bus 11, as the sampling signal, the sampling signal exports behind sampling module 12, the signal of sampling module 12 output is as the input signal of feedback module 13 input side, get back to direct current bus 11 through the second end of feedback module 13 input side, form closed loop, feedback module 13's output side third end earth connection, PWM control circuit 14 is connected to the fourth end, the size of the signal of telecommunication of feedback module 13 input side input can directly influence the signal of telecommunication of feedback module 13's output side output, therefore, the size of direct current bus 11's voltage signal, can influence the signal size of feedback module 13 fourth end output, through the signal size of feedback module 13 fourth end output, can control PWM control circuit 14's output signal, and then control the increase or the reduction of direct current bus voltage.
The sampling module 12 samples the dc bus voltage, and outputs the signal to the input side of the feedback module 13, further controlling the magnitude of the electrical signal output by the output side, thereby controlling the output of the PWM control circuit 14, which outputs a control signal to the gate of the power MOS in the push-pull voltage boost circuit 15 to drive the power MOS to turn on and off, so as to regulate and control the voltage of the dc bus 11, for example, the collected sampling signal is too large, and the duty ratio of the output signal of the PWM control circuit 14 is controlled to be reduced, so that the power MOS transistor in the push-pull boost circuit 15 is turned off, and the voltage of the dc bus 11 is reduced, if the collected sampling signal is too small, the duty ratio of the output signal of the PWM control circuit 14 is controlled to be increased, a power MOS tube in the push-pull boosting circuit 15 is driven to be conducted, the voltage of the direct current bus 11 is increased, and therefore the voltage of the direct current bus 11 is stabilized.
Through the combined action of the sampling module and the feedback module, the original voltage transformer is replaced, and because the sampling module and the feedback module are small in size, the internal space of the system can be saved, and the cost can be reduced.
Example 2
This embodiment provides another sampling feedback circuit, and fig. 2 is a structural diagram of a sampling feedback circuit according to another embodiment of the present invention; as shown in fig. 2, the sampling module includes: a reference pole of the voltage regulator 21 is connected with a first connection point on the direct current bus and an anode grounding wire, a first resistor R1 and a cathode are connected between the first connection point and the grounding wireThe feedback module 13 is connected, because the first resistor R1 is connected between the first connection point and the second connection point, and the first resistor R1 has a certain resistance value, a certain voltage drop can be generated after the voltage output by the first end of the direct current bus passes through the first resistor R1, the reference electrode and the anode of the voltage regulator are connected in parallel at two ends of the first resistor, so that the voltage between the reference electrode and the anode of the voltage regulator is equal to the voltage at two ends of the first resistor, and the output voltage V of the voltage regulator is equal to the voltage at two ends of the first resistorOThe sampling voltage Uref rises, so that Uref>Vref of the voltage regulator, high level is output by the comparator, and the transistor is turned on to make VODescending; on the contrary, when VOWhen the voltage drops, the sampling voltage Uref also drops, so that Uref<Vref, the comparator turns over again to output low level to turn on/off the transistor, and finally V is setOThe rising is circulated to reach the dynamic flat crossing to force the output voltage VOThe stability is stable, and the purpose of stabilizing the voltage is achieved.
In this embodiment, a second resistor R2 is connected in series between the sampling module and the first end of the dc bus, and since the regulator has a certain working current range, the second resistor R2 is a current-limiting resistor, and the second resistor R2 is selected according to a principle that the current of the regulator is within an allowable working range, so that the regulator can work normally.
In this embodiment, the feedback module includes: the input side of the photoelectric coupling module 22 comprises a first end and a second end, the first end of the photoelectric coupling module 22 is connected with the output end of the sampling module, the second end of the photoelectric coupling module 22 is connected with the second end of the direct current bus, the input side of the photoelectric coupling module 22 and the third resistor R3 are connected between the output end of the sampling module and the second end of the direct current bus in parallel, because the voltage value of the input side of the photoelectric coupler is equal to the third resistor R3, the third resistor R3 is needed to be arranged for generating voltage drop as the input voltage of the input side of the photoelectric coupling module 22, after the input voltage of the input side of the photoelectric coupling module 22, the light emitting diode in the photoelectric coupling module 22 emits light due to passing current, and after the photosensitive element in the photoelectric coupling module 22 is illuminated, the collector and the emitter are conducted, the input side of the photoelectric coupling module 22 inputs voltage, and the voltage of the output side is larger, so that the output of the photoelectric coupling module 22 is controlled according to the sampling voltage, the magnitude of a feedback signal of the output of the PWM control circuit 14 is controlled, the rising or the lowering of the dc bus voltage is controlled, and in addition, the output side and the input side can be electrically isolated in the true sense through the photoelectric coupling module 22.
In this embodiment, a fourth resistor R4 is connected in series between the second end of the feedback module and the second end of the dc bus, and the fourth resistor R4 is a current-limiting resistor and is used to limit the current of the whole sampling feedback circuit, so as to prevent the damage of components in the circuit due to the excessive current in the circuit.
In this embodiment, the sampling feedback circuit further includes: the input end of the voltage stabilizing module is connected with the second end of the feedback module, the output end of the voltage stabilizing module is connected with the second end of the direct current bus, and the voltage stabilizing module specifically comprises: the anode of the diode D is connected with the second end of the feedback module, the cathode of the diode is connected with the second end of the direct current bus, preferably, the diode D is a voltage stabilizing diode, the forward characteristic of a voltage-current characteristic curve of the voltage stabilizing diode is similar to that of a common diode, and the reverse characteristic is that when the reverse voltage is lower than the reverse breakdown voltage, the reverse resistance is large, and the reverse leakage current is extremely small. However, when the reverse voltage approaches the threshold value of the reverse voltage, the reverse current increases abruptly, called breakdown, at which point the reverse resistance drops abruptly to a very small value. The voltage stabilizing diode can realize that the voltage across the diode is basically stabilized near the breakdown voltage although the current varies in a large range, thereby realizing the voltage stabilizing function.
In this embodiment, a first capacitor C1 is further connected between the first end of the feedback module and the first end of the dc bus, and the first capacitor C1 is connected to isolate the influence of the voltage directly output from the dc bus on the input side of the photoelectric coupler 22.
Example 3
The present embodiment provides another sampling feedback circuit, which is a voltage sampling feedback circuit diagram with an output voltage of 220V, and the transformer outputs a square wave AC220V and outputs a direct current DC220V through a rectifier bridge. And then a voltage sampling feedback circuit is connected to the direct current bus. Fig. 3 is a block diagram of a sampling feedback circuit according to another embodiment of the present invention, and as shown in fig. 3, the voltage sampling feedback circuit includes:
the voltage of the first voltage stabilizing diode D1 and the second voltage stabilizing diode D2 are connected in parallel on a DC220V bus, the voltage stabilizing value of the first voltage stabilizing diode D1 is 200V/3W, the voltage stabilizing value of the second voltage stabilizing diode D2 is 8.2V/0.5W, and according to the working characteristics of the voltage stabilizing diodes, the sum of the voltages of D1 and D2 is 208.2V, so that the voltage of the point B1 is 11.8V;
the photoelectric coupler PC817 is connected with the voltage stabilizing diodes D1 and D2, the working principle of the photoelectric coupler PC817 is that the output current of the pole C of the TOP tube is controlled through the input current change, the current of the pole C of the TOP tube controls the width of PWM wave through an error amplifier, and the purpose of enabling a direct current bus to stabilize the output voltage is achieved, and the PWM wave can change linearly due to the fact that the current IC of the pole C of the TOP tube is between 2 and 6 mA. Therefore, the current of the input photocoupler is designed to be 2.9mA, so that the tenth resistor R10 of the current limiting resistor is 2K Ω, and the ninth resistor R9 is 1K Ω.
And the precision voltage stabilizer TL431 is connected between the direct current bus and the photoelectric coupler PC817, and the reference voltage of the precision voltage stabilizer TL431 is 2.5V, namely Vra is 2.5V. In order that R8 is 2.5V when the output voltage is DC220V, the values of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are 470K Ω, 200K Ω, and 10K Ω, respectively. Since the forward voltage drop of the diode inside the photocoupler PC817 is 1.2V and the ninth resistor R9 is 1K Ω, the minimum current flowing into the TL431 is 1.2 mA. According to specifications of PC817 and TL431, design parameters enable the photoelectric coupler PC817 and the precision voltage stabilizer TL431 to be in a working range, the first voltage stabilizing diode D1 and the second voltage stabilizing diode D2 are connected in series, the potential of a B1 point is 11.8V, a resistor is configured, and the photoelectric coupler PC817 and the precision voltage stabilizer TL431 are matched for use through capacitance parameters. According to the change of the sampling voltage, the PWM waveform width is automatically adjusted to achieve the voltage stabilizing effect, compared with a voltage transformer, the sampling feedback single-path is low in manufacturing cost and small in size, and the requirement of higher density of a power supply is met.
Fig. 4 is a connection relationship diagram of a sampling feedback circuit in an inverter system according to an embodiment of the present invention, and as shown in fig. 4, the inverter system includes: a direct current DC48V power supply 41, an anti-voltage-back circuit 42, a filter circuit 43, a push-pull boosting circuit 44 (the push-pull boosting circuit 15 in the above embodiment), a direct current DC220V power supply 45, and an alternating current AC220V power supply 46, wherein the output end of the direct current DC48V power supply 45 is connected to the sampling feedback circuit 47, the sampling feedback circuit is connected to a PWM wave control circuit 48 (the PWM control circuit 14 in the above embodiment), the input end of the PWM wave control circuit is connected to a start-up circuit 49, the output end is connected to the push-pull boosting circuit 44, the input end of the start-up circuit 49 is connected to the filter circuit 43, and the inverter system has the working process that:
direct current DC48V as an input power input; through the anti-voltage-boosting circuit, wherein the anti-voltage-boosting circuit is a protection circuit and prevents the input positive electrode and the input negative electrode from being reversely connected; the output end of the filter circuit is respectively used as the input ends of the push-pull booster circuit and the starting circuit, and the starting circuit provides an input power supply for the PWM wave control circuit; the PWM wave control circuit outputs a PWM control waveform to a grid electrode of a power MOS tube in the push-pull boosting circuit to drive the power MOS tube to be switched on and switched off; the push-pull boosting circuit outputs square wave AC220V, and the square wave AC220V is output to a direct current DC220V power supply after rectification and filtering. The sampling circuit samples at the output end of the filter circuit, and the current of the C pole of the TOP tube in the PC817 is changed to be used as the input of a feedback pin of the PWM control chip, so that the width of a PWM waveform is controlled, and the voltage stabilization effect is finally achieved.
Example 4
The embodiment provides an inverter system, which comprises the sampling feedback circuit and is used for realizing the voltage stabilization of a direct current bus.
Example 5
The present embodiment provides a sampling feedback method applied to the sampling feedback circuits of embodiments 1 to 3, and fig. 5 is a flowchart of the sampling feedback method according to the embodiment of the present invention, as shown in fig. 5, the method includes:
s501, acquiring a sampling signal, in this embodiment, acquiring the sampling signal through a sampling module connected to one end of a dc bus;
s502, controlling a feedback signal output according to the sampling signal, specifically, including: determining the input current of a feedback module according to the sampling signal; controlling the output current of the feedback module according to the input current;
the sampling module is connected in parallel to two ends of the first resistor, and under the condition that the resistance values of the sampling module and the first resistor are fixed, the change of the sampling voltage can cause the output current of the sampling module to change linearly, namely the input current of the feedback module changes linearly, namely the input current of the feedback module is in direct proportion to the sampling voltage, so the input current of the feedback module can be determined according to the sampling signal, namely the larger the sampling signal is, the larger the input current of the feedback module is; the smaller the sampling signal is, the smaller the input current of the feedback module is; the feedback module comprises an input side and an output side, the larger the current of the input side is, the larger the current of the output side is, and the magnitude of the output current of the feedback module can be controlled according to the input current of the feedback module, so that the input current of the feedback module can be controlled through a sampling signal, and the output current of the feedback module is further controlled.
And S503, outputting and controlling the output waveform of the PWM control circuit according to the feedback signal, and controlling the output waveform of the PWM control circuit according to the change condition of the output current of the feedback module during specific implementation.
Specifically, if the output current of the feedback module is increased, controlling the duty ratio of the output waveform of the PWM control circuit to be reduced; the output current of the feedback module is increased, which means that the input current of the feedback module is increased, and further means that the sampling signal is increased, that is, the voltage of the dc bus is increased, at this time, the duty ratio of the output waveform of the PWM control circuit should be controlled to be decreased, and further the power MOS transistor in the push-pull boost circuit 15 is controlled to be turned off, so that the voltage of the dc bus 11 is decreased.
If the output current of the feedback module is reduced, controlling the duty ratio of the output waveform of the PWM control circuit to be increased; the output current of the feedback module is reduced, which means that the input current of the feedback module is reduced, and further means that the sampling signal is reduced, that is, the voltage of the direct current bus is reduced, at this time, the duty ratio of the output waveform of the PWM control circuit should be controlled to be increased, and further the power MOS transistor in the push-pull boost circuit is controlled to be turned on, so that the voltage of the direct current bus is increased.
If the output current of the feedback module is not changed, the duty ratio of the output waveform of the PWM control circuit is controlled to be unchanged, and the output current of the feedback module is not changed, which indicates that the voltage of the direct current bus is stable and the current state needs to be kept. The direct current bus voltage is sampled, the direct current bus voltage value is obtained in real time, feedback adjustment is carried out on the direct current bus voltage value according to the obtained direct current bus voltage, the direct current bus voltage can be guaranteed to be in a stable level, and the voltage stabilizing effect is achieved.
Example 6
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the method in the above-described embodiments.
The above-described circuit embodiments are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (15)

1. A sampling feedback circuit, the circuit comprising:
the input end of the sampling module is connected with the first end of the direct current bus, and the output end of the sampling module is connected with the first end of the feedback module;
and the second end of the feedback module is connected with the second end of the direct current bus, the third end of the feedback module is connected with a ground wire, and the fourth end of the feedback module is connected with the PWM control circuit.
2. The circuit of claim 1, wherein the sampling module comprises:
the first pole of the voltage stabilizing source is connected with a first connecting point on the direct current bus, the second pole of the voltage stabilizing source is connected with a grounding wire, a first resistor is connected between the first connecting point and the grounding wire, and the third pole of the voltage stabilizing source is connected with the feedback module.
3. The circuit of claim 1, wherein a second resistor is connected in series between the sampling module and the first end of the dc bus.
4. The circuit of claim 1, wherein the feedback module comprises:
the photoelectric coupling module is connected with the third resistor in parallel and then is connected between the output end of the sampling module and the second end of the direct current bus.
5. The circuit of claim 1, wherein a fourth resistor is connected in series between the second end of the feedback module and the second end of the dc bus.
6. The circuit of claim 1, further comprising:
and the input end of the voltage stabilizing module is connected with the second end of the feedback module, and the output end of the voltage stabilizing module is connected with the second end of the direct current bus.
7. The circuit of claim 1, wherein the voltage regulator module comprises:
and the anode of the diode is connected with the second end of the feedback module, and the cathode of the diode is connected with the second end of the direct current bus.
8. The circuit of claim 1, wherein a first capacitor is further coupled between the first end of the feedback module and the first end of the dc bus.
9. An inverter system comprising a sampling feedback circuit as claimed in any one of claims 1 to 8.
10. A sampling feedback method applied to the sampling feedback circuit according to any one of claims 1 to 8, comprising:
acquiring a sampling signal;
controlling feedback signal output according to the sampling signal;
and outputting an output waveform for controlling the PWM control circuit according to the feedback signal.
11. The method of claim 10, wherein controlling a feedback signal output in accordance with the sampling signal comprises:
determining the input current of a feedback module according to the sampling signal; wherein the sampling signal is a voltage signal.
And controlling the output current of the feedback module according to the input current.
12. The method of claim 11, wherein determining the input current of the feedback module based on the sampled signal comprises:
the larger the sampling signal is, the larger the input current of the feedback module is;
the smaller the sampling signal, the smaller the input current of the feedback module.
13. The method of claim 12, wherein outputting an output waveform for controlling a PWM control circuit based on the feedback signal comprises:
and controlling the output waveform of the PWM control circuit according to the change condition of the output current of the feedback module.
14. The method of claim 13, wherein controlling the output waveform of the PWM control circuit according to the variation of the output current of the feedback module comprises:
if the output current of the feedback module is increased, controlling the duty ratio of the output waveform of the PWM control circuit to be reduced;
if the output current of the feedback module is reduced, controlling the duty ratio of the output waveform of the PWM control circuit to be increased;
and if the output current of the feedback module is unchanged, controlling the duty ratio of the output waveform of the PWM control circuit to be unchanged.
15. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 10 to 14.
CN201911002396.2A 2019-10-21 2019-10-21 Sampling feedback circuit, sampling feedback method and inverter system Pending CN110719022A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080055798A1 (en) * 2006-08-29 2008-03-06 Bcd Semiconductor Manufacturing Limited Electronic power protection circuit and applications thereof
CN203536942U (en) * 2013-11-01 2014-04-09 广州市爱浦电子科技有限公司 A novel ring choke converter output overvoltage protection circuit
CN206533114U (en) * 2016-12-07 2017-09-29 深圳市崧盛电子股份有限公司 Power supply overvoltage protection circuit and power supply
CN110022633A (en) * 2018-06-30 2019-07-16 北京东方英卡数字信息技术有限公司 A kind of lighting network control applied to municipal road lamp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080055798A1 (en) * 2006-08-29 2008-03-06 Bcd Semiconductor Manufacturing Limited Electronic power protection circuit and applications thereof
CN203536942U (en) * 2013-11-01 2014-04-09 广州市爱浦电子科技有限公司 A novel ring choke converter output overvoltage protection circuit
CN206533114U (en) * 2016-12-07 2017-09-29 深圳市崧盛电子股份有限公司 Power supply overvoltage protection circuit and power supply
CN110022633A (en) * 2018-06-30 2019-07-16 北京东方英卡数字信息技术有限公司 A kind of lighting network control applied to municipal road lamp

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Application publication date: 20200121