CN112953176A - Cascade circuit and control method thereof - Google Patents
Cascade circuit and control method thereof Download PDFInfo
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- CN112953176A CN112953176A CN202110282182.6A CN202110282182A CN112953176A CN 112953176 A CN112953176 A CN 112953176A CN 202110282182 A CN202110282182 A CN 202110282182A CN 112953176 A CN112953176 A CN 112953176A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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Abstract
The invention provides a cascade circuit, a control circuit and a control method thereof, wherein the control circuit comprises a feedback circuit and a feedback control circuit, the output end of the feedback circuit is coupled with the input end of the feedback control circuit, and the feedback circuit is used for acquiring a feedback signal of the voltage at the output end of a resonant circuit of the cascade circuit; the feedback control circuit generates a control signal based on the output end voltage of the first-stage voltage conversion circuit of the cascade circuit and the feedback signal, and the control signal is used for controlling the switching tube of the first-stage voltage conversion circuit to be switched on or switched off. The control circuit of the cascade circuit, the cascade circuit and the control method of the cascade circuit can realize variable output of the first-stage voltage conversion circuit of the cascade circuit, realize optimal efficiency of the resonant circuit, improve the cascade efficiency and reduce the system volume.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a cascade circuit, a control circuit and a control method thereof.
Background
For a cascade circuit with wide output (3.3-21V) and wide input (90-265VAC), when the power of the cascade circuit is more than 65W, the power factor and the harmonic wave of the total harmonic distortion need to meet the IEC61000-3-2 technical standard, as shown in FIG. 1, the cascade circuit in the prior art is adopted, and a three-stage circuit structure of a boost circuit, a resonant LLC circuit and a buck circuit is adopted, so that the three-stage circuit structure has high cost and large volume, and the working efficiency is not ideal due to the adoption of the three-stage structure for working.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a cascade circuit, a control circuit and a control method thereof, which effectively reduce the volume of a circuit system and improve the charging efficiency.
The technical solution for realizing the purpose of the invention is as follows:
a control circuit of a cascade circuit, the cascade circuit comprises a first-stage voltage conversion circuit and a resonance circuit, wherein the output end of the first-stage voltage conversion circuit is connected with the input end of the resonance circuit, the control circuit comprises a feedback circuit and a feedback control circuit, the output end of the feedback circuit is coupled with the input end of the feedback control circuit, the output end of the feedback control circuit is coupled with a switching tube of the first-stage voltage conversion circuit, wherein: the feedback circuit is used for acquiring a feedback signal of the voltage at the output end of the resonant circuit; and the feedback control circuit generates a control signal based on the output end voltage of the first-stage voltage conversion circuit and the feedback signal and is used for controlling a switching tube of the first-stage voltage conversion circuit.
Further, in the control circuit of the cascade circuit of the present invention, the feedback circuit includes an output voltage detection circuit for detecting an output voltage of the resonant circuit.
Further, in the control circuit of the cascade circuit of the present invention, the feedback circuit includes a feedback winding, the feedback winding is one winding of a multi-winding transformer, the multi-winding transformer is disposed in the resonant circuit, and the feedback winding is used for obtaining a feedback signal of the output end voltage of the resonant circuit.
Furthermore, the feedback circuit of the control circuit of the cascade circuit of the invention comprises a regulator, the input end of the regulator is coupled with the feedback winding through a divider resistor, and the output end of the regulator is coupled with the input end of the feedback control circuit, so as to eliminate the output signal deviation of the feedback winding.
Further, in the control circuit of the cascade circuit, the regulator adopts a power factor regulator.
Furthermore, the feedback control circuit of the cascade circuit of the invention comprises an operational amplifier and a driving circuit, wherein two input ends of the operational amplifier are respectively connected with the output end voltage of the first-stage voltage conversion circuit and the feedback signal of the feedback circuit, the output end is coupled with the driving circuit, and the output end of the driving circuit is coupled with the switching tube of the first-stage voltage conversion circuit.
Further, in the control circuit of the cascade circuit of the present invention, the feedback control circuit includes a loop compensation circuit, and the loop compensation circuit is coupled between the operational amplifier and the driving circuit, and is configured to adjust and control a voltage output from the operational amplifier to the driving circuit.
Furthermore, in the control circuit of the cascade circuit, the connection point of the operational amplifier and the driving circuit is grounded through a capacitor.
Furthermore, in the control circuit of the cascade circuit of the invention, one input end of the operational amplifier is connected to the voltage of the output end of the first-stage voltage conversion circuit through the divider resistor.
A cascade circuit comprises a first-stage voltage conversion circuit, a resonant circuit and the control circuit, wherein: the input end of the first-stage voltage conversion circuit is coupled with input voltage, the switching tube is connected with a control signal of the control circuit, and the output end of the first-stage voltage conversion circuit is coupled with the input end of the resonant circuit and used for outputting working voltage to the resonant circuit; the output end of the resonant circuit is coupled with the load and used for driving the load; the feedback circuit is connected with a feedback signal of the voltage at the output end of the resonant circuit, and the output end of the feedback circuit is coupled with the feedback control circuit; the feedback control circuit is connected to the voltage and the feedback signal of the output end of the first-stage voltage conversion circuit, and the output end of the feedback control circuit is coupled to the switching tube of the first-stage voltage conversion circuit.
Further, in the cascade circuit of the invention, the first-stage voltage conversion circuit adopts a buckboost structure circuit.
Further, the cascade circuit of the invention comprises a multi-winding transformer in the resonant circuit.
Further, in the cascade circuit of the present invention, a controller is coupled to the switch tube of the resonant circuit, and the controller is coupled to the output terminal of the resonant circuit through a photocoupler.
A method of controlling a cascaded circuit, comprising:
the first-stage voltage conversion circuit acquires external input voltage, performs voltage boosting and reducing processing according to the control signal, and outputs working voltage to the resonant circuit;
the resonant circuit drives a load based on the working voltage output by the first-stage voltage conversion circuit;
the feedback circuit acquires a feedback signal of the voltage at the output end of the resonant circuit and outputs the feedback signal to the feedback control circuit;
the feedback control circuit controls the on and off of a switching tube of the first-stage voltage conversion circuit to fix the gain of the resonant circuit, and a control signal of the feedback control circuit is generated based on the output end voltage of the first-stage voltage conversion circuit and the feedback signal.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the control circuit of the cascade circuit generates the control signal of the first-stage voltage conversion circuit by operating the output end voltage of the first-stage voltage conversion circuit of the cascade circuit and the feedback signal, thereby realizing the variable output of the first-stage voltage conversion circuit of the cascade circuit and leading the resonance circuit of the cascade circuit to realize the fixed gain.
2. The cascade circuit of the invention adopts a fixed gain resonance circuit and controls the first-stage voltage conversion circuit according to the output of LLC, thereby realizing the improvement of cascade efficiency and the reduction of system volume.
3. The cascade circuit of the invention adopts the first-stage voltage conversion circuit with variable output and the resonance circuit structure with fixed gain, compared with the three-stage circuit structure in the prior art, the cascade circuit reduces the system volume, realizes the optimal efficiency of the resonance circuit and reduces the cost of the cascade circuit.
Drawings
Fig. 1 is a schematic diagram of a conventional cascade circuit.
Fig. 2 is a schematic diagram of a control circuit of a cascade circuit according to an embodiment of the invention.
FIG. 3 is a schematic diagram of a cascade circuit according to an embodiment of the invention.
Fig. 4 is a flowchart of a cascade circuit control method according to an embodiment of the invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. Combinations of different embodiments, and substitutions of features from different embodiments, or similar prior art means may be substituted for or substituted for features of the embodiments shown and described.
The term "coupled" or "connected" in this specification includes both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as a conductor, wherein the electrically conductive medium may contain parasitic inductance or parasitic capacitance, or through an intermediate circuit or component as described in the embodiments in the specification; indirect connections may also include connections through other active or passive devices that perform the same or similar function, such as connections through circuits or components like switches, driver circuits, signal amplification circuits, or follower circuits. "plurality" or "plurality" means two or more.
The control circuit of the cascade circuit of the invention can be applied to various multistage cascade circuits, such as a voltage equalizing circuit, a quick charging circuit, a power supply circuit and the like, and the following description takes the quick charging circuit as an example and combines with the attached figure 2 to describe in detail.
Fig. 2 shows a control circuit 20 for the fast charging circuit 10 according to an embodiment of the present invention. The fast charging circuit 10 includes a first-stage voltage conversion circuit 11 and a resonant circuit 12, wherein an output terminal of the first-stage voltage conversion circuit 11 is connected to an input terminal of the resonant circuit 12. The control circuit 20 includes a feedback circuit 21 and a feedback control circuit 22, an output terminal of the feedback circuit 21 is coupled to an input terminal of the feedback control circuit 22, and an output terminal of the feedback control circuit 22 is coupled to the switch transistor T1 of the first-stage voltage converting circuit 11. The feedback circuit 21 obtains a feedback signal of the output end voltage Vout of the resonant circuit 12, the feedback control circuit 22 obtains the output end voltage Vbus of the first-stage voltage conversion circuit 11 and the feedback signal of the feedback circuit 21, and then generates a control signal to control the on/off of the switching tube T1 of the first-stage voltage conversion circuit 11 based on the output end voltage Vbus and the feedback signal, so that the output end voltage of the first-stage voltage conversion circuit 11 is variable output, and the resonant circuit realizes a fixed gain.
The feedback circuit 21 includes an output voltage detection circuit for detecting the output voltage of the resonance circuit. In one embodiment, the feedback circuit 21 includes a feedback winding 211, the feedback winding 211 is one of windings of a three-winding transformer T, the three-winding transformer T is disposed in the resonant circuit 12, and the feedback winding 211 is used for obtaining a feedback signal of the output end voltage Vout of the resonant circuit 12. In another embodiment, feedback circuit 21 includes a feedback winding 211 and a regulator 212, feedback winding 211 acquiring a feedback signal of output terminal voltage Vout of resonant circuit 12; the input end of the regulator 212 is coupled to the feedback winding 211 through a voltage dividing resistor, specifically, the feedback winding 211 is sequentially connected in series with two resistors R1 and R2, the other end of the feedback winding 211 and the other end of the resistor R2 are grounded, and the input end of the regulator 212 is connected between the resistors R1 and R2; an output of regulator 212 is coupled to an input of feedback control circuit 22 for canceling an output signal deviation of feedback winding 211. The regulator 212 may be a power factor regulator or other similar type of regulator.
In one embodiment, the feedback control circuit 22 includes an operational amplifier a, a non-inverting input terminal of the operational amplifier a is connected to the feedback signal of the feedback circuit 21, an inverting input terminal of the operational amplifier a is connected to the output voltage of the first stage voltage converting circuit, the operational amplifier a amplifies the connected feedback signal and the output voltage Vbus, and an output terminal of the operational amplifier a is connected to the switch transistor T1 to achieve control over the switch transistor T1. In another embodiment, the feedback control circuit 22 includes an operational amplifier a and a driving circuit 221, a non-inverting input terminal of the operational amplifier a is connected to the feedback signal of the feedback circuit 21, an inverting input terminal of the operational amplifier a is connected to the output voltage of the first-stage voltage converting circuit 11, the operational amplifier a performs an operation process on the connected feedback signal and the output voltage Vbus, an output terminal of the operational amplifier a is coupled to the driving circuit 221, an output terminal of the driving circuit 221 is coupled to the switching tube T1 of the first-stage voltage converting circuit 11, and the driving of the first-stage voltage converting circuit 11 is realized by the driving signal of the driving circuit 221. In one embodiment, the circuit further comprises a loop compensation circuit coupled between the operational amplifier and the driving circuit for adjusting the voltage controlling the output of the operational amplifier to the driving circuit. In another embodiment, the connection point of the operational amplifier a and the driving circuit 221 is grounded through a capacitor C.
The cascade circuit of the present invention includes various multi-stage cascade circuits, such as a voltage-equalizing circuit, a fast charging circuit, a power circuit, etc., and the fast charging circuit is taken as an example and is described in detail with reference to fig. 3.
As shown in fig. 3, the fast charging circuit according to an embodiment of the present invention includes a first-stage voltage converting circuit 11, a resonant circuit 12, and a control circuit 20, where the first-stage voltage converting circuit 11 may adopt various voltage converting circuits, and in this embodiment, the first-stage voltage converting circuit 11 adopts a buckboost circuit as an example, and is described in detail with reference to the accompanying drawings. Wherein:
the input end of the buckboost circuit is coupled to the input voltage, the switching tube T1 at the input end is coupled to the control signal of the control circuit 20, the switching tube T1 is turned on or off according to the control signal, and the output end of the buckboost circuit is coupled to the input end of the resonant circuit 12 and outputs the working voltage to the resonant circuit 12.
The resonant circuit 12 obtains an output voltage of the buckboost circuit, and an output terminal of the resonant circuit 12 is coupled to a load for driving the load.
The control circuit 20 includes a feedback circuit 21 and a feedback control circuit 22, an output terminal of the feedback circuit 21 is coupled to an input terminal of the feedback control circuit 22, and an output terminal of the feedback control circuit 22 is coupled to the switching transistor T1 of the buckboost circuit. The feedback circuit 21 is connected to and obtains a feedback signal of the output end voltage Vout of the resonance circuit 12, the feedback control circuit 22 obtains the output end voltage Vbus of the buckboost circuit and the feedback signal of the feedback circuit 21, then a control signal is generated based on the output end voltage Vbus of the buckboost circuit and the feedback signal of the feedback circuit 21, and finally the control signal is used for controlling the on or off of the switch tube T1 of the buckboost circuit, so that the variable output of the buckboost circuit and the fixed gain of the resonance circuit are realized.
In one embodiment, the feedback control circuit 22 includes an operational amplifier a, a non-inverting input terminal of which is connected to the feedback signal of the feedback circuit 21; the inverting input end of the operational amplifier A is connected to the voltage of the output end of the buckboost circuit through a voltage dividing resistor, specifically, two resistors R3 and R4 are connected to the output end of the first-stage voltage conversion circuit 11 in series, and the inverting input end of the operational amplifier A is connected between the resistors R3 and R4; the operational amplifier A amplifies the accessed feedback signal and the output end voltage Vbus. The output end of the operational amplifier A is connected with the switch tube T1 so as to realize the control of the switch tube.
In one embodiment, a controller 121 is coupled to the switching tubes T2, T3 of the resonant circuit 12, and the controller 121 is coupled to the output of the resonant circuit 12 via an opto-coupler.
Fig. 4 is a flowchart illustrating a control method of a fast charging circuit according to an embodiment of the present invention, where the control method includes:
s100: the first-stage voltage conversion circuit 11 acquires an external input voltage signal, performs voltage boosting and reducing processing according to a control signal, and outputs working voltage to the resonance circuit 12;
s200: the resonant circuit 12 outputs a voltage driving load after performing resonant filtering based on the voltage at the output end of the first-stage voltage conversion circuit 11 and the control signal of the controller 121;
s300: the feedback circuit 21 acquires a feedback signal of the voltage at the output end of the resonant circuit 12 and outputs the feedback signal to the feedback control circuit;
s400: the feedback control circuit 22 controls the on and off of the switching tube of the first-stage voltage conversion circuit 11 to fix the gain of the resonant circuit 12, and the control signal of the feedback control circuit 22 is generated based on the output end voltage of the first-stage voltage conversion circuit 11 and the feedback signal of the feedback circuit 21.
Those skilled in the art should understand that the logic controls such as "high" and "low", "set" and "reset", "and gate" and "or gate", "non-inverting input" and "inverting input" in the logic controls referred to in the specification or the drawings may be exchanged or changed, and the subsequent logic controls may be adjusted to achieve the same functions or purposes as the above-mentioned embodiments.
The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. The descriptions related to the effects or advantages in the specification may not be reflected in practical experimental examples due to uncertainty of specific condition parameters or influence of other factors, and the descriptions related to the effects or advantages are not used for limiting the scope of the invention. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (14)
1. A control circuit of a cascade circuit, the cascade circuit comprises a first-stage voltage conversion circuit and a resonance circuit, wherein the output end of the first-stage voltage conversion circuit is connected with the input end of the resonance circuit, the control circuit comprises a feedback circuit and a feedback control circuit, the output end of the feedback circuit is coupled with the input end of the feedback control circuit, the output end of the feedback control circuit is coupled with a switching tube of the first-stage voltage conversion circuit, wherein:
the feedback circuit is used for acquiring a feedback signal of the voltage at the output end of the resonant circuit;
and the feedback control circuit generates a control signal based on the output end voltage of the first-stage voltage conversion circuit and the feedback signal and is used for controlling the switching tube of the first-stage voltage conversion circuit to be switched on or switched off.
2. The control circuit of the cascade circuit of claim 1, wherein the feedback circuit comprises an output voltage detection circuit for detecting an output voltage of the resonant circuit.
3. The control circuit of the cascade circuit according to claim 1 or 2, wherein the feedback circuit comprises a feedback winding, the feedback winding is one of windings in a multi-winding transformer, the multi-winding transformer is arranged in the resonant circuit, and the feedback winding is used for acquiring a feedback signal of the output end voltage of the resonant circuit.
4. The control circuit of claim 3, wherein the feedback circuit comprises a regulator having an input coupled to the feedback winding via a voltage divider resistor and an output coupled to the input of the feedback control circuit for canceling the output signal deviation of the feedback winding.
5. The control circuit of the cascade circuit of claim 4, wherein the regulator is a power factor regulator.
6. The cascade circuit control circuit of claim 1, wherein the feedback control circuit comprises an operational amplifier and a driving circuit, two input terminals of the operational amplifier are respectively connected to the voltage at the output terminal of the first stage voltage converting circuit and the feedback signal of the feedback circuit, the output terminal is coupled to the driving circuit, and the output terminal of the driving circuit is coupled to the switching tube of the first stage voltage converting circuit.
7. The cascaded circuit of claim 6, wherein the feedback control circuit comprises a loop compensation circuit coupled between the operational amplifier and the driver circuit for regulating a voltage controlling the output of the operational amplifier to the driver circuit.
8. The control circuit of the cascade circuit according to claim 6 or 7, wherein a connection point of the operational amplifier and the driving circuit is grounded through a capacitor.
9. The control circuit of the cascade circuit as claimed in claim 6 or 7, wherein an input terminal of the operational amplifier is connected to an output terminal of the first stage voltage conversion circuit through a voltage dividing resistor.
10. A cascode circuit comprising a first stage voltage conversion circuit, a resonant circuit, and the control circuit of claims 1-9, wherein:
the input end of the first-stage voltage conversion circuit is coupled with input voltage, the switch tube of the input end of the first-stage voltage conversion circuit is connected with a control signal of the control circuit, and the output end of the first-stage voltage conversion circuit is coupled with the input end of the resonant circuit and used for outputting working voltage to the resonant circuit;
the output end of the resonant circuit is coupled with the load and used for driving the load;
the feedback circuit is connected to a feedback signal at the output end voltage of the resonant circuit, and the output end of the feedback circuit is coupled with the feedback control circuit;
the feedback control circuit is connected to the voltage and the feedback signal of the output end of the first-stage voltage conversion circuit, and the output end of the feedback control circuit is coupled to the switching tube of the first-stage voltage conversion circuit.
11. The cascade circuit of claim 10, wherein the first stage voltage conversion circuit is a buckboost structure circuit.
12. The cascode circuit of claim 10, wherein the resonant circuit includes a multi-winding transformer therein.
13. The cascade circuit of claim 10, wherein a controller is coupled to the switching tube of the resonant circuit, the controller coupled to the output of the resonant circuit via an opto-coupler.
14. A method of controlling a cascade circuit, comprising:
the first-stage voltage conversion circuit acquires external input voltage, performs voltage boosting and reducing processing according to the control signal, and outputs working voltage to the resonant circuit;
the resonant circuit drives a load based on the working voltage output by the first-stage voltage conversion circuit;
the feedback circuit acquires a feedback signal of the voltage at the output end of the resonant circuit and outputs the feedback signal to the feedback control circuit;
the feedback control circuit controls the on and off of a switching tube of the first-stage voltage conversion circuit to fix the gain of the resonant circuit, and a control signal of the feedback control circuit is generated based on the voltage of an output end of the first-stage voltage conversion circuit and a feedback signal of the feedback circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110282182.6A CN112953176A (en) | 2021-03-16 | 2021-03-16 | Cascade circuit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110282182.6A CN112953176A (en) | 2021-03-16 | 2021-03-16 | Cascade circuit and control method thereof |
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|---|---|---|---|---|
| CN101247072A (en) * | 2007-02-13 | 2008-08-20 | 艾默生网络能源系统有限公司 | Voltage regulating circuit |
| CN101668369A (en) * | 2009-10-01 | 2010-03-10 | 英飞特电子（杭州）有限公司 | High-efficiency constant-current LED driver |
| JP2010166719A (en) * | 2009-01-16 | 2010-07-29 | Mitsubishi Electric Corp | Motor drive control device, compressor, blower, air conditioner, and refrigerator or freezer |
| CN101834541A (en) * | 2010-06-02 | 2010-09-15 | 英飞特电子（杭州）有限公司 | Constant current circuit with high power factor |
| US20110025289A1 (en) * | 2009-07-31 | 2011-02-03 | Delta Electronics, Inc. | Two-stage switching power supply |
-
2021
- 2021-03-16 CN CN202110282182.6A patent/CN112953176A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101247072A (en) * | 2007-02-13 | 2008-08-20 | 艾默生网络能源系统有限公司 | Voltage regulating circuit |
| JP2010166719A (en) * | 2009-01-16 | 2010-07-29 | Mitsubishi Electric Corp | Motor drive control device, compressor, blower, air conditioner, and refrigerator or freezer |
| US20110025289A1 (en) * | 2009-07-31 | 2011-02-03 | Delta Electronics, Inc. | Two-stage switching power supply |
| CN101668369A (en) * | 2009-10-01 | 2010-03-10 | 英飞特电子（杭州）有限公司 | High-efficiency constant-current LED driver |
| CN101834541A (en) * | 2010-06-02 | 2010-09-15 | 英飞特电子（杭州）有限公司 | Constant current circuit with high power factor |
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Application publication date: 20210611 |