CN117220494B - Adjusting circuit for single-stage PFC (power factor correction) applied to quick-charging product and quick-charging product - Google Patents
Adjusting circuit for single-stage PFC (power factor correction) applied to quick-charging product and quick-charging product Download PDFInfo
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- CN117220494B CN117220494B CN202311488745.2A CN202311488745A CN117220494B CN 117220494 B CN117220494 B CN 117220494B CN 202311488745 A CN202311488745 A CN 202311488745A CN 117220494 B CN117220494 B CN 117220494B
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- 239000003990 capacitor Substances 0.000 claims description 32
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a regulating circuit of a single-stage PFC applied to a quick-charge product and the quick-charge product, comprising a single-stage PFC conversion circuit, an isolation transformer, a rectifying and filtering circuit and a DC conversion chip which are electrically connected in sequence, and further comprising a voltage follower circuit and a photoelectric coupler; the photoelectric coupler is controlled to be operated on-off by a DC conversion chip; the voltage follower circuit changes the resistance value of the downward bias resistor of the voltage feedback pin of the DC conversion chip according to the on-off state of the photoelectric coupler; by the application of the regulating circuit, the output ripple of the fast charging source applying the single-stage PFC topology can be reduced to be within the required range, the output voltage efficiency of 5V and below of the product can meet the DOE standard requirement, the topology structure of the single-stage PFC can be completely applied to the fast charging field, and the high-quality characteristics of low cost, high PF value and low THD superior to the conventional flyback topology structure are realized.
Description
Technical Field
The invention relates to the technical field of fast-charging products, in particular to an adjusting circuit for applying single-stage PFC to a fast-charging product.
Background
The english of PFC is called "Power Factor Correction" and means "power factor correction", and the power factor refers to the relationship between the effective power and the total power consumption (apparent power), that is, the ratio of the effective power divided by the total power consumption (apparent power), and basically, the power factor may measure the extent to which electric power is effectively utilized, and when the power factor value is larger, it represents the higher electric power utilization.
The PFC circuit is divided into a single stage and a plurality of stages, the single stage PFC is mainly applied to an LED driving power supply at present, and the single stage PFC is gradually introduced into the field of fast-charging products due to the fast development of the fast-charging products; however, the single-stage PFC does not use a high-capacity high-voltage capacitor at the primary stage, so that the output ripple is particularly large, and almost reaches 2-3V ripple (within 300 mV), and the large output ripple can cause abnormal or even bad work for terminal equipment. Secondly, the output of the fast charging covers the output range of 3.3V-21V, when the output of the C/A port is at or below 5V, the efficiency of the DC conversion part is very poor and even DOEs not meet the DOE efficiency standard requirement due to the large pressure difference between the input and the output, and an adjusting circuit capable of completely applying the topological structure of the single-stage PFC to the single-stage PFC in the fast charging field to the fast charging product is needed.
Disclosure of Invention
The invention aims to solve the technical problem that the invention provides a regulating circuit of a single-stage PFC applied to a quick-charging product and also provides the quick-charging product aiming at the defects in the prior art.
The technical scheme adopted for solving the technical problems is as follows:
the regulating circuit for the quick-charging product by using the single-stage PFC comprises a single-stage PFC converting circuit, an isolation transformer, a rectifying and filtering circuit and a DC converting chip which are electrically connected in sequence, and further comprises a voltage follower circuit and a photoelectric coupler;
the photoelectric coupler is controlled to be operated on-off by the DC conversion chip;
and the voltage follower circuit changes the resistance value of the downward bias resistor of the voltage feedback pin of the DC conversion chip according to the on-off state of the photoelectric coupler.
The single-stage PFC provided by the invention is applied to a regulating circuit of a fast-charging product, wherein the voltage follower circuit comprises a first resistor and a second resistor which are connected in parallel;
one end of the first resistor is electrically connected with an auxiliary winding of the isolation transformer, and the other end of the first resistor is electrically connected with a voltage feedback pin of the DC conversion chip;
one end of the second resistor is electrically connected with one end of the photoelectric coupler and grounded, and the other end of the second resistor is electrically connected with a voltage feedback pin of the DC conversion chip;
the other end of the photoelectric coupler is electrically connected with the VCC end.
The single-stage PFC disclosed by the invention is applied to an adjusting circuit of a quick-charging product, wherein a third resistor is electrically connected between the second resistor and the photoelectric coupler; one end of the third resistor, which is electrically connected with the second resistor, is grounded; one end of the fourth resistor, which is far away from the first field effect tube, is electrically connected with a voltage feedback pin of the DC conversion chip; the S electrode of the first field effect transistor is electrically connected with the third resistor, the D electrode of the first field effect transistor is electrically connected with the fourth resistor, the G electrode of the first field effect transistor is electrically connected with a first capacitor and a fifth resistor, the other end of the first capacitor is electrically connected with one end, close to the second resistor, of the third resistor, and the other end of the fifth resistor is electrically connected with the P electrode of the zener diode;
one end of the third resistor, which is electrically connected with the second resistor, is sequentially connected with a second field effect transistor and a sixth resistor in series; one end of the sixth resistor, which is far away from the second field effect transistor, is electrically connected with a voltage feedback pin of the DC conversion chip; the S electrode of the second field effect transistor is electrically connected with the third resistor, the D electrode of the second field effect transistor is electrically connected with the sixth resistor, and the G electrode of the second field effect transistor is electrically connected with a second capacitor and a seventh resistor; the other end of the second capacitor is electrically connected with one end, close to the second resistor, of the third resistor, the other end of the seventh resistor is electrically connected with one end, far away from the second resistor, of the third resistor, a first diode is arranged on the seventh resistor in parallel, the positive electrode of the first diode is electrically connected with the third resistor, and the negative electrode of the first diode is electrically connected with the G electrode of the second field effect transistor;
one end of the eighth resistor, which is far away from the third capacitor, is electrically connected with one end of the third resistor, which is far away from the second resistor; one end of the third capacitor, which is close to the eighth resistor, is electrically connected with a second diode, the positive electrode of the second diode is electrically connected with the third capacitor, and the negative electrode of the second diode is electrically connected with the positive electrode of the first diode; and one end of the third capacitor, which is close to the eighth resistor, is electrically connected with the N pole of the zener diode.
The single-stage PFC disclosed by the invention is applied to a regulating circuit of a fast charging product, wherein a ninth resistor is electrically connected between the VCC end and the photoelectric coupler.
The single-stage PFC of the invention is applied to a regulating circuit of a fast-charging product, wherein the rectifying and filtering circuit comprises a third diode and a tenth resistor which are connected in series; the anode of the third diode is electrically connected with the auxiliary winding of the isolation transformer, and the cathode of the third diode is electrically connected with the tenth resistor; one end of the tenth resistor, which is far away from the third diode, is electrically connected with the VCC end and a VCC pin of the DC conversion chip; the VCC pin of DC conversion chip is electrically connected with fourth electric capacity and exchanges there is polarity electric capacity, the positive pole of exchanging there is polarity electric capacity with the VCC pin of DC conversion chip is electrically connected, the negative pole with the fourth electric capacity is kept away from the one end of the VCC pin of DC conversion chip is electrically connected, the negative pole of exchanging there is polarity electric capacity ground.
The quick-charging product is characterized in that the regulating circuit for the quick-charging product, which is applied to the quick-charging product, is arranged on the quick-charging product.
The invention has the beneficial effects that: by the application of the regulating circuit, the output ripple of the fast charging source applying the single-stage PFC topology can be reduced to be within the required range, the output voltage efficiency of 5V and below of the product can meet the DOE standard requirement, the topology structure of the single-stage PFC can be completely applied to the fast charging field, and the high-quality characteristics of low cost, high PF value and low THD superior to the conventional flyback topology structure are realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, in which the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained by those skilled in the art without inventive effort:
fig. 1 is a schematic diagram of a single-stage PFC application to a fast-charge product according to a preferred embodiment of the present invention;
fig. 2 is a circuit diagram of a regulation circuit of a single-stage PFC according to a preferred embodiment of the present invention applied to a fast-charge product.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following description will be made in detail with reference to the technical solutions in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
The single-stage PFC of the preferred embodiment of the invention is applied to an adjusting circuit of a quick-charging product, as shown in figure 1, and referring to figure 2, and comprises a single-stage PFC converting circuit 1, an isolation transformer 2, a rectifying and filtering circuit 3 and a DC converting chip 4 which are arranged in sequence in an electric connection way, and further comprises a voltage follower circuit 5 and a photoelectric coupler 6;
the photoelectric coupler 6 is controlled to be operated on-off by the DC conversion chip 4;
the voltage follower circuit 5 changes the resistance value of a downward bias resistor of a voltage feedback pin of the DC conversion chip 4 according to the on-off state of the photoelectric coupler 6, and the resistance value of the downward bias resistor determines the output voltage value;
the following is described in connection with the specific circuit diagram shown in fig. 2:
the voltage follower circuit comprises a first resistor R2 and a second resistor R9 which are connected in parallel;
one end of the first resistor R2 is electrically connected with an auxiliary winding T1B of the isolation transformer, and the other end of the first resistor R2 is electrically connected with a voltage feedback pin of the DC conversion chip U1;
one end of the second resistor R9 is electrically connected with one end of the photoelectric coupler OP1B and grounded, and the other end of the second resistor R9 is electrically connected with a voltage feedback pin of the DC conversion chip;
the other end of the photoelectric coupler is electrically connected with the VCC end;
a third resistor R4 is electrically connected between the second resistor R9 and the photoelectric coupler OP 1B; one end of the third resistor R4, which is electrically connected with the second resistor R9, is grounded; one end of the third resistor R4, which is electrically connected with the second resistor R9, is sequentially connected with a first field effect transistor Q2 and a fourth resistor R8 in series, and one end of the fourth resistor R8, which is far away from the first field effect transistor Q2, is electrically connected with a voltage feedback pin of the DC conversion chip U1; the S electrode of the first field effect transistor Q2 is electrically connected with the third resistor R4, the D electrode is electrically connected with the fourth resistor R8, the G electrode is electrically connected with the first capacitor C4 and the fifth resistor R10, the other end of the first capacitor C4 is electrically connected with one end, close to the second resistor R9, of the third resistor R4, and the other end of the fifth resistor R10 is electrically connected with the P electrode of the zener diode ZD 1;
one end of the third resistor R4, which is electrically connected with the second resistor R9, is sequentially connected with a second field effect transistor Q1 and a sixth resistor R7 in series; one end of the sixth resistor R7 far away from the second field effect transistor Q1 is electrically connected with a voltage feedback pin of the DC conversion chip U1; the S electrode of the second field effect transistor Q1 is electrically connected with the third resistor R4, the D electrode is electrically connected with the sixth resistor, and the G electrode is electrically connected with the second capacitor C3 and the seventh resistor R6; the other end of the second capacitor C3 is electrically connected with one end of the third resistor R4, which is close to the second resistor R9, the other end of the seventh resistor R6 is electrically connected with one end of the third resistor R4, which is far away from the second resistor R9, the seventh resistor R6 is provided with a first diode D2 in parallel, the positive electrode of the first diode D2 is electrically connected with the third resistor R4, and the negative electrode of the first diode D2 is electrically connected with the G electrode of the second field effect transistor Q1;
one end of the third resistor R4, which is electrically connected with the second resistor R9, is sequentially connected with a third capacitor C2 and an eighth resistor R5 in series, and one end of the eighth resistor R5, which is far away from the third capacitor C2, is electrically connected with one end of the third resistor R4, which is far away from the second resistor R9; one end of the third capacitor C2, which is close to the eighth resistor R5, is electrically connected with a second diode D3, the positive electrode of the second diode D3 is electrically connected with the third capacitor C2, and the negative electrode of the second diode D3 is electrically connected with the positive electrode of the first diode D2; one end of the third capacitor C2, which is close to the eighth resistor R5, is electrically connected with the N pole of the zener diode ZD 1;
a ninth resistor R3 is electrically connected between the VCC terminal and the photocoupler OP 1B.
R2, R9 provides signal voltage and sends into Pin2 of DC conversion chip U1 after dividing voltage, adjust DC conversion chip front end output voltage, resistance R7/R8 is parallelly connected with R9 according to the demand, will change the total resistance after parallelly connected, the logic is as follows:
at the moment of starting up, 16V needs to be output from the front end of the product, the lower the voltage is, the easier the standby power consumption meets the standard requirement of 300mW, the DC conversion chip U1 outputs low level, the optocoupler does not emit light, the OP1B is not conducted, the Q1 and the Q2 are not conducted, the downward bias resistor of the FB pin of the DC conversion chip is only R9, and the voltage of the FB pin is high, so that the DC conversion chip is only 16V to output.
When the output of the C/A port is 15V, the front end voltage of the product is required to be recovered to 25V output at the moment, the DC conversion chip gives out a high level, the optical coupler emits light, the OP1B is conducted, the Q1 and the Q2 are conducted, the resistors R7 and R8 are connected with the fixed R9 in parallel, the downward bias resistor of the FB pin of the DC conversion chip is changed into the total resistor value after the R7, the R8 and the R9 are connected in parallel, the resistor value is reduced, and the front end output voltage of the product is increased to 25V.
The front-end voltage is increased from 16V to 25V and is completed by two steps, so that an overvoltage protection point of the DC conversion chip FB is avoided, which is triggered by mistake due to the fact that the voltage rising amplitude is too large.
D2, D3 play the role of unidirectional conductivity, and DC conversion chip U1 gives a high level, and the optocoupler emits light, OP1B switches on, and C3 is charged, and when the voltage of C3 reaches the threshold value of Q1 on, Q1 switches on.
While C4 is charged, and when the C4 voltage reaches the threshold at which Q2 is on, Q2 is turned on. When the design is adopted, C4 is larger than C3, and then C3 is filled before C4, namely Q1 is opened before Q2.
The opening time sequence of Q1 and Q2 can be controlled by adjusting the capacity of C3 and C4, and the time sequence of R7, R8 and R9 which are connected in parallel can be controlled, so that the voltage of the front end is controlled to change in a stepwise manner, the voltage of the FB toecap of the DC conversion chip U1 is reduced, and false triggering is prevented;
the single-stage PFC is a topological form of combining a PFC circuit and a flyback circuit, and conventionally, an independent PFC circuit and an independent flyback circuit are needed, however, the single-stage PFC structure is combined with flyback, so that the product is simplified, the product volume is reduced, and the multifunctional integrated characteristic is achieved. But also produces high ripple, low efficiency in 5V output and unresolved idle power consumption.
By the application of the voltage follower circuit, the output ripple of the fast charge source applying the single-stage PFC topology can be reduced to be within the required range, the output voltage efficiency of 5V and below of the product can meet the DOE standard requirement, the topology structure of the single-stage PFC can be completely applied to the fast charge field, and the high-quality characteristics of low cost, high PF value and low THD superior to the conventional flyback topology structure are realized.
In addition, as the front-end voltage is switched between 16V and 25V before the application voltage is followed, the voltage change at the moment of conversion can generate a feedback signal peak at the FB pin of the DC conversion chip, the overvoltage protection point set by the chip is extremely easy to trigger, and the product is powered down instantaneously.
The rectifying and filtering circuit can adopt the existing conventional circuit, and can also adopt: comprising a third diode D1 and a tenth resistor R1 connected in series; the positive electrode of the third diode D1 is electrically connected with the auxiliary winding T1B of the isolation transformer, and the negative electrode of the third diode D1 is electrically connected with the tenth resistor R1; one end of the tenth resistor R1 far away from the third diode D1 is electrically connected with the VCC end and the VCC pin of the DC conversion chip U1; the VCC pin of the DC conversion chip U1 is electrically connected with a fourth capacitor C1 and an alternating current polar capacitor EC1, the positive electrode of the alternating current polar capacitor EC1 is electrically connected with the VCC pin of the DC conversion chip U1, the negative electrode of the alternating current polar capacitor EC1 is electrically connected with one end, far away from the VCC pin of the DC conversion chip U1, of the fourth capacitor C1, and the negative electrode of the alternating current polar capacitor EC1 is grounded; the VCC rectifying and filtering circuit formed by D1, R1, EC1 and C1 provides normal power supply for the work of the DC conversion chip U1.
The quick-charging product is characterized in that the regulation circuit for the quick-charging product, which is applied to the quick-charging product, is arranged on the quick-charging product.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (4)
1. The regulating circuit is characterized by comprising a single-stage PFC converting circuit, an isolation transformer, a rectifying and filtering circuit and a DC converting chip which are electrically connected in sequence, and further comprises a voltage follower circuit and a photoelectric coupler;
the photoelectric coupler is controlled to be operated on-off by the DC conversion chip;
the voltage follower circuit changes the resistance value of the downward bias resistor of the voltage feedback pin of the DC conversion chip according to the on-off state of the photoelectric coupler; the voltage follower circuit comprises a first resistor and a second resistor which are connected in parallel;
one end of the first resistor is electrically connected with an auxiliary winding of the isolation transformer, and the other end of the first resistor is electrically connected with a voltage feedback pin of the DC conversion chip;
one end of the second resistor is electrically connected with one end of the photoelectric coupler and grounded, and the other end of the second resistor is electrically connected with a voltage feedback pin of the DC conversion chip;
the other end of the photoelectric coupler is electrically connected with the VCC end; a third resistor is electrically connected between the second resistor and the photoelectric coupler; one end of the third resistor, which is electrically connected with the second resistor, is grounded; one end of the fourth resistor, which is far away from the first field effect tube, is electrically connected with a voltage feedback pin of the DC conversion chip; the S electrode of the first field effect transistor is electrically connected with the third resistor, the D electrode of the first field effect transistor is electrically connected with the fourth resistor, the G electrode of the first field effect transistor is electrically connected with a first capacitor and a fifth resistor, the other end of the first capacitor is electrically connected with one end, close to the second resistor, of the third resistor, and the other end of the fifth resistor is electrically connected with the P electrode of the zener diode;
one end of the third resistor, which is electrically connected with the second resistor, is sequentially connected with a second field effect transistor and a sixth resistor in series; one end of the sixth resistor, which is far away from the second field effect transistor, is electrically connected with a voltage feedback pin of the DC conversion chip; the S electrode of the second field effect transistor is electrically connected with the third resistor, the D electrode of the second field effect transistor is electrically connected with the sixth resistor, and the G electrode of the second field effect transistor is electrically connected with a second capacitor and a seventh resistor; the other end of the second capacitor is electrically connected with one end, close to the second resistor, of the third resistor, the other end of the seventh resistor is electrically connected with one end, far away from the second resistor, of the third resistor, a first diode is arranged on the seventh resistor in parallel, the positive electrode of the first diode is electrically connected with the third resistor, and the negative electrode of the first diode is electrically connected with the G electrode of the second field effect transistor;
one end of the eighth resistor, which is far away from the third capacitor, is electrically connected with one end of the third resistor, which is far away from the second resistor; one end of the third capacitor, which is close to the eighth resistor, is electrically connected with a second diode, the positive electrode of the second diode is electrically connected with the third capacitor, and the negative electrode of the second diode is electrically connected with the positive electrode of the first diode; and one end of the third capacitor, which is close to the eighth resistor, is electrically connected with the N pole of the zener diode.
2. The single-stage PFC conditioning circuit for a fast charge product of claim 1 wherein a ninth resistor is electrically connected between the VCC terminal and the optocoupler.
3. The single-stage PFC conditioning circuit for a fast charge product of claim 1 wherein the rectifying and filtering circuit includes a third diode and a tenth resistor connected in series; the anode of the third diode is electrically connected with the auxiliary winding of the isolation transformer, and the cathode of the third diode is electrically connected with the tenth resistor; one end of the tenth resistor, which is far away from the third diode, is electrically connected with the VCC end and a VCC pin of the DC conversion chip; the VCC pin of DC conversion chip is electrically connected with fourth electric capacity and exchanges there is polarity electric capacity, the positive pole of exchanging there is polarity electric capacity with the VCC pin of DC conversion chip is electrically connected, the negative pole with the fourth electric capacity is kept away from the one end of the VCC pin of DC conversion chip is electrically connected, the negative pole of exchanging there is polarity electric capacity ground.
4. A fast-charging product, characterized in that a regulating circuit for applying the single-stage PFC according to any one of claims 1-3 to the fast-charging product is provided on the fast-charging product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311488745.2A CN117220494B (en) | 2023-11-09 | 2023-11-09 | Adjusting circuit for single-stage PFC (power factor correction) applied to quick-charging product and quick-charging product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311488745.2A CN117220494B (en) | 2023-11-09 | 2023-11-09 | Adjusting circuit for single-stage PFC (power factor correction) applied to quick-charging product and quick-charging product |
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| Publication Number | Publication Date |
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| CN117220494A CN117220494A (en) | 2023-12-12 |
| CN117220494B true CN117220494B (en) | 2024-02-23 |
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| CN202311488745.2A Active CN117220494B (en) | 2023-11-09 | 2023-11-09 | Adjusting circuit for single-stage PFC (power factor correction) applied to quick-charging product and quick-charging product |
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| CN117220494A (en) | 2023-12-12 |
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