CN117498704B - Flyback power supply circuit for charging pile of charging and replacing cabinet and use method of flyback power supply circuit - Google Patents
Flyback power supply circuit for charging pile of charging and replacing cabinet and use method of flyback power supply circuit Download PDFInfo
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- CN117498704B CN117498704B CN202311850127.8A CN202311850127A CN117498704B CN 117498704 B CN117498704 B CN 117498704B CN 202311850127 A CN202311850127 A CN 202311850127A CN 117498704 B CN117498704 B CN 117498704B
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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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
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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
- H02M1/0048—Circuits or arrangements for reducing losses
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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
-
- 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
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a flyback power supply circuit for a charging pile of a charging cabinet and a use method thereof, wherein the flyback power supply circuit comprises a transformer, one end of a primary side coil and a secondary side coil of the transformer are electrically connected with one end of a starting resistor and the cathode of a fifth diode, the other end of the primary side coil and the secondary side coil of the transformer are electrically connected with a modulation circuit, the modulation circuit is electrically connected with one end of a supporting capacitor, and the modulation circuit is electrically connected with the other end of the supporting capacitor, the other end of the starting resistor and the cathode of a second diode; the anode of the second diode is electrically connected with the cathode of the third diode and one end of the second capacitor at the input end of the load control circuit; the positive pole of the third diode is electrically connected with one end of the second coil, and the other end of the second coil is electrically connected with the other end of the second capacitor and the input end of the load control circuit. Aiming at a high-power flyback power supply, the invention realizes the purposes of reducing input loss, reducing input voltage range and improving starting speed with lower cost.
Description
Technical Field
The invention relates to the field of electricity, charging and changing cabinets and charging piles, in particular to a flyback power supply circuit for a charging pile of a charging and changing cabinet and a use method thereof.
Background
At present, the flyback modulation circuit of the flyback auxiliary power supply in the market generally adopts the following two modes: 1. the primary side high voltage is supplied by LDO or TVS voltage limiting modulation mode; 2. the primary side is excited in a current-limiting way, and the auxiliary power supply voltage generated by the secondary side reversely supplies power to the flyback modulation circuit.
For mode 1: the power supply is supplied by adopting an LDO or TVS voltage limiting modulation mode, and is generally applied to circuits of which the primary side and the secondary side need to be isolated. When the input voltage is higher, the power supply circuit is larger in loss and serious in heating. The circuit is adjusted to adapt to higher voltage, so that low voltage input cannot provide current required for modulation, and therefore, the input voltage range of the auxiliary power circuit is narrow in adaptability and high in loss.
For mode 2: the mode that the auxiliary power supply of the secondary side reversely supplies power to the flyback modulation circuit by adopting the conventional primary side current-limiting excitation has the following defects: (1) when the primary excitation current-limiting resistor is smaller, the normal loss is larger, and the heating is serious; (2) when the primary side excitation current limiting resistor is larger, the excitation current provided by the primary side excitation current limiting resistor is smaller, and when the secondary side load is larger, the secondary side excitation can be repeated for a plurality of times to achieve stable output, the starting time is longer, and the condition that the required input voltage is higher is caused.
Disclosure of Invention
In order to solve the technical problems, the invention provides a flyback power supply circuit for a charging pile of a charging cabinet.
The aim of the invention is achieved by the following technical scheme:
the flyback power supply circuit for the charging pile of the charging cabinet comprises a transformer T, wherein the homonymous end of a primary coil L1 of the transformer T is electrically connected with one end of a starting resistor R6 and the negative electrode of a fifth diode D5, the heteronymous end of the primary coil L1 of the transformer T is electrically connected with a control output end MOS-D of a modulation circuit, a power supply negative electrode GND of the modulation circuit is electrically connected with one end of a supporting capacitor C1, and a power supply positive electrode VCC of the modulation circuit is electrically connected with the other end of the supporting capacitor C1, the other end of the starting resistor R6 and the negative electrode of a second diode D2; the anode of the second diode D2 is electrically connected with the input anode In+ of the input end of the load control circuit, the cathode of the third diode D3 and one end of the second capacitor C2; the positive electrode of the third diode D3 is electrically connected with the synonym end of the main and auxiliary side coil L2 of the transformer T, and the synonym end of the main and auxiliary side coil L2 is electrically connected with the other end of the second capacitor C2 and the input negative electrode IN-of the input end of the load control circuit;
the secondary coil L3 is also arranged in cooperation with the primary coil L1, the synonym end of the secondary coil L3 is electrically connected with the positive electrode of the fourth diode D4, the homonym end of the secondary coil L3 is electrically connected with one end of the third capacitor C3, and the negative electrode of the fourth diode D4 is electrically connected with the other end of the third capacitor C3; the primary and secondary side coils L2 are electrically connected with a first load through a load control circuit to form a first loop, and the secondary side coils L3 are electrically connected with a second load to form a second loop;
the load control circuit comprises a first diode D1, wherein the cathode of the first diode D1 is electrically connected with the synonym end of the primary and secondary coil L2, one end of a second capacitor C2, one end of a fourth resistor R4, one end of a sixth capacitor C6 and the source electrode of a first MOS tube Q1; the positive electrode of the first diode D1 is electrically connected with one end of the first resistor R1, and the other end of the first resistor R1 is electrically connected with one end of the second resistor R2, one end of the third resistor R3 and the base electrode of the second triode Q2;
the other end of the fourth resistor R4 is electrically connected with the other end of the sixth capacitor C6, the grid electrode of the first MOS tube Q1 and one end of the fifth resistor R5, and the other end of the fifth resistor R5 is electrically connected with the collector electrode of the second triode Q2;
the other end of the second resistor R2 is electrically connected with the other end of the second capacitor C2, the homonymous end of the main and secondary side coil L2, the emitter of the second triode Q2 and the output cathode Vout 1-of the output end of the load control circuit;
the other end of the third resistor R3 is electrically connected with the drain electrode of the first MOS tube Q1 and the output positive electrode Vout1+ of the output end of the load control circuit.
Further improvements, the first load comprises a fourth capacitor C4 and an eleventh resistor R11 which are connected in parallel; one end of the first load is electrically connected with an output positive pole Vout1+ of the output end of the load control circuit, and the other end of the first load is electrically connected with an output negative pole Vout 1-of the output end of the load control circuit.
In a further improvement, the second load comprises a fifth capacitor C5 and a twelfth resistor R12 which are connected in parallel, one end of the second load is electrically connected with the negative electrode of the fourth diode D4, and the other end of the second load is electrically connected with the same-name end of the secondary side coil L3.
The application method of the flyback power supply circuit for the charging pile of the charging cabinet comprises the following steps:
step one: the flyback power supply circuit for the charging pile of the charging cabinet is electrified from the anode of the fifth diode D5 and the other end of the supporting capacitor C1, and the starting resistor R6 charges the supporting capacitor C1;
step two: the voltage of the supporting capacitor C1 reaches the working threshold of the modulation circuit, the modulation circuit starts to work, and the flyback power supply starts to output;
step three: after the output voltage of the primary and secondary side coil L2 of the transformer T reaches the working threshold value of the modulation circuit and the voltage drop of the second diode D2, the output of the primary and secondary side coil L2 starts to supply power to the modulation circuit, and the load control circuit is not started at this time, the first MOS tube Q1 is closed, and the output load of the transformer T only has the supporting capacitor C1, so that the starting speed is high;
step four: when the output voltage of the primary coil L2 and the secondary coil L2 of the transformer T reaches the working threshold Vth1 of the load control circuit, the first MOS tube Q1 is conducted, the load control circuit starts to output the voltage Vout1, and the output voltage of the transformer T is reduced under the influence of the fourth capacitor C4 and the fifth capacitor C5 on the load side;
and step five, after the first MOS tube Q1 is conducted, the third resistor R3 feeds Vout1 back to the base electrode of the second triode Q2, and the second triode Q2 is conducted, so that the conducting voltage of the first MOS tube Q1 is reduced, the minimum threshold of the required output voltage is reduced to the turn-off threshold, and the condition that the output Vout1 is disconnected after being conducted is avoided.
Further, the third resistor R3 is an adjusting circuit, and the turn-off threshold is reduced by reducing the resistance value of the third resistor R3, and the turn-off threshold is increased by increasing the resistance value of the third resistor R3.
The invention has the beneficial effects that:
aiming at a high-power flyback power supply, the invention realizes the purposes of reducing input loss, reducing input voltage range and improving starting speed with lower cost.
Drawings
The invention is further illustrated by the accompanying drawings, the content of which does not constitute any limitation of the invention.
FIG. 1 is a circuit diagram of a flyback power supply circuit for a charging pile of a charging cabinet;
FIG. 2 is a circuit diagram of a load control circuit;
fig. 3 is a schematic circuit diagram of a modulation circuit.
Detailed Description
The invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the invention more apparent.
Example 1
The flyback power supply circuit for the charging pile of the charging cabinet shown in fig. 1 and 2 comprises a transformer T, wherein the transformer T comprises a primary coil L1, a primary coil L2 and a secondary coil L3.
The same-name end of the primary coil L1 is electrically connected with one end of the starting resistor R6 and the cathode of the fifth diode D5, the different-name end of the primary coil L1 of the transformer T is electrically connected with the control output end MOS-D of the modulation circuit, the power supply cathode GND of the modulation circuit is electrically connected with one end of the supporting capacitor C1, and the power supply anode VCC of the modulation circuit is electrically connected with the other end of the supporting capacitor C1, the other end of the starting resistor R6 and the cathode of the second diode D2; the anode of the second diode D2 is electrically connected with the input anode In+ of the input end of the load control circuit, the cathode of the third diode D3 and one end of the second capacitor C2; the positive electrode of the third diode D3 is electrically connected to the synonym end of the primary-secondary coil L2 of the transformer T. The homonymous end of the primary and secondary side coil L2 is electrically connected with the other end of the second capacitor C2 and an input negative electrode IN < - > of the input end of the load control circuit;
the synonym end of the secondary side coil L3 is electrically connected with the positive electrode of the fourth diode D4, the synonym end of the secondary side coil L3 is electrically connected with one end of the third capacitor C3, and the negative electrode of the fourth diode D4 is electrically connected with the other end of the third capacitor C3; the primary and secondary side coils L2 are electrically connected with a first load through a load control circuit to form a first loop, and the secondary side coils L3 are electrically connected with a second load to form a second loop.
The load control circuit comprises a first diode D1, wherein the cathode of the first diode D1 is electrically connected with the synonym end of the primary and secondary side coil L2, one end of a second capacitor C2, one end of a fourth resistor R4, one end of a sixth capacitor C6 and the source electrode of a first MOS tube Q1; the positive pole of first diode D1 is connected first resistance R1's one end electricity, and first resistance R1's the other end electricity is connected second resistance R2's one end, third resistance R3's one end and second triode Q2's base.
The other end of the fourth resistor R4 is electrically connected with the other end of the sixth capacitor C6, the grid electrode of the first MOS tube Q1 and one end of the fifth resistor R5, and the other end of the fifth resistor R5 is electrically connected with the collector electrode of the second triode Q2.
The other end of the second resistor R2 is electrically connected with the other end of the second capacitor C2, the same-name end of the main and secondary side coil L2, the emitter of the second triode Q2 and the output cathode Vout 1-of the output end of the load control circuit.
The other end of the third resistor R3 is electrically connected with the drain electrode of the first MOS tube Q1 and the output positive electrode Vout1+ of the output end of the load control circuit.
The first load comprises a fourth capacitor C4 and an eleventh resistor R11 which are connected in parallel; one end of the first load is electrically connected with an output positive pole Vout1+ of the output end of the load control circuit, and the other end of the first load is electrically connected with an output negative pole Vout 1-of the output end of the load control circuit. The second load comprises a fifth capacitor C5 and a twelfth resistor R12 which are connected in parallel, one end of the second load is electrically connected with the negative electrode of the fourth diode D4, and the other end of the second load is electrically connected with the same-name end of the secondary side coil L3.
The application method of the invention is as follows: taking the output modulation voltage of 12V as an example, starting from the power-up time of ViN:
state one: vin is electrified, and a starting resistor R6 charges a supporting capacitor C1;
state two: the voltage of the supporting capacitor C1 reaches the working threshold of the modulation circuit, the modulation circuit starts to work, and the flyback power supply starts to output;
state three: when the output voltage of the primary side and the secondary side reaches the working threshold value of the modulation circuit and the voltage of the second diode D2 is reduced, the flyback power supply starts to supply power for the modulation circuit. Because the load control circuit is not started at this time, the MOS tube Q1 is closed, and the flyback power supply transformer output load only has the supporting capacitor C1, so the starting speed is higher;
state four: when the primary and secondary side output voltages reach the working threshold Vth1 of the load control circuit, the load control circuit is reliably operated. The MOS tube Q1 is conducted, the flyback power supply starts to output Vout1, and the output voltage of the flyback power supply transformer is possibly reduced due to the influence of load side capacitors (C4 and C5) and load current;
state five: after the Q1 is conducted, the threshold value of the output voltage required by the conduction of the Q1 is reduced to the turn-off threshold value Vth2 due to the feedback action of the third resistor R3, so that the output Vout1 is ensured not to be disconnected after the conduction;
state six: when the input voltage decreases and the flyback power supply output fails to meet the current required by the load, vout1 may be decreased. At this time, the lower turn-off threshold 2 can ensure that the load control circuit continues to work, so that the load cannot be restarted due to insufficient short-time input voltage, and the use condition of unstable input voltage is met.
The operational threshold Vth1 calculation formula of the load control circuit: vth 1=vd1+vde (r2 ' +r3' +r1' +r2 ' +r3 ')/(r2 ' +r3 ')
The turn-off threshold Vth2 is set according to the required low-voltage protection point, wherein the maximum allowable value of the turn-off threshold is
Vth2max=C2’*Vth1/(C2’+C4’)
The resistance R3' of the third resistor (R3) is calculated according to the required turn-off threshold, and the calculation formula is as follows:
R3’=R2’*(Vth2-Vde)/Vde
vth2max: the off threshold Vth2 is the maximum allowable value.
R1', R2' and R3' are the resistances of the first resistor R1, the second resistor R2 and the third resistor R3, respectively.
C2 'and C4' are the capacitance values of the second capacitor and the fourth capacitor, respectively.
Vd1: the stabilized voltage of the first diode D1.
Vde: the first transistor Q2 turns on the voltage drop.
It is to be understood that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention.
Claims (5)
1. The flyback power supply circuit for the charging pile of the charging cabinet is characterized by comprising a transformer (T), wherein the homonymous end of a primary coil (L1) of the transformer (T) is electrically connected with one end of a starting resistor (R6) and the negative electrode of a fifth diode (D5), the heteronymous end of the primary coil (L1) of the transformer (T) is electrically connected with a control output end (MOS-D) of a modulation circuit, a power supply negative electrode (GND) of the modulation circuit is electrically connected with one end of a supporting capacitor (C1), and a power supply positive electrode (VCC) of the modulation circuit is electrically connected with the other end of the supporting capacitor (C1), the other end of the starting resistor (R6) and the negative electrode of a second diode (D2); the anode of the second diode (D2) is electrically connected with the input anode (in+), the cathode of the third diode (D3) and one end of the second capacitor (C2) of the input end of the load control circuit; the positive electrode of the third diode (D3) is electrically connected with the different name end of the main side coil (L2) of the transformer (T), and the same name end of the main side coil (L2) is electrically connected with the other end of the second capacitor (C2) and the input negative electrode (IN-) of the input end of the load control circuit;
the secondary coil (L3) is also arranged in cooperation with the primary coil (L1), the synonym end of the secondary coil (L3) is electrically connected with the positive electrode of the fourth diode (D4), the homonymous end of the secondary coil (L3) is electrically connected with one end of the third capacitor (C3), and the negative electrode of the fourth diode (D4) is electrically connected with the other end of the third capacitor (C3); the primary secondary coil (L2) is electrically connected with a first load through a load control circuit to form a first loop, and the secondary coil (L3) is electrically connected with a second load to form a second loop;
the load control circuit comprises a first diode (D1), wherein the cathode of the first diode (D1) is electrically connected with the cathode of the third diode (D3), one end of a second capacitor (C2), one end of a fourth resistor (R4), one end of a sixth capacitor (C6) and the source electrode of the first MOS tube (Q1); the positive electrode of the first diode (D1) is electrically connected with one end of a first resistor (R1), and the other end of the first resistor (R1) is electrically connected with one end of a second resistor (R2), one end of a third resistor (R3) and the base electrode of a second triode (Q2);
the other end of the fourth resistor (R4) is electrically connected with the other end of the sixth capacitor (C6), the grid electrode of the first MOS tube (Q1) and one end of the fifth resistor (R5), and the other end of the fifth resistor (R5) is electrically connected with the collector electrode of the second triode (Q2);
the other end of the second resistor (R2) is electrically connected with the other end of the second capacitor (C2), the homonymous end of the main and secondary side coil (L2), the emitter of the second triode (Q2) and the output negative electrode (Vout 1-);
the other end of the third resistor (R3) is electrically connected with the drain electrode of the first MOS tube (Q1) and the output positive electrode (Vout < 1+ >) of the output end of the load control circuit.
2. The flyback power supply circuit for a charging pile of a charging cabinet according to claim 1, wherein the first load comprises a fourth capacitor (C4) and an eleventh resistor (R11) connected in parallel with each other; one end of the first load is electrically connected with an output positive electrode (Vout 1+), and the other end of the first load is electrically connected with an output negative electrode (Vout 1+), which is arranged at the output end of the load control circuit.
3. The flyback power supply circuit for the charging pile of the charging cabinet according to claim 1, wherein the second load comprises a fifth capacitor (C5) and a twelfth resistor (R12) which are connected in parallel, one end of the second load is electrically connected with the negative electrode of the fourth diode (D4), and the other end of the second load is electrically connected with the homonymous end of the secondary side coil (L3).
4. The use method of the flyback power supply circuit for the charging pile of the charging cabinet is characterized in that the flyback power supply circuit for the charging pile of the charging cabinet is as set forth in any one of claims 1-3, and comprises the following steps:
step one: the flyback power supply circuit for the charging pile of the charging cabinet is electrified from the anode of the fifth diode (D5) and the other end of the supporting capacitor (C1), and the starting resistor (R6) charges the supporting capacitor (C1);
step two: the voltage of the supporting capacitor (C1) reaches the working threshold of the modulation circuit, the modulation circuit starts to work, and the flyback power supply starts to output;
step three: after the output voltage of the primary and secondary coils (L2) of the transformer (T) reaches the working threshold value of the modulation circuit and the voltage of the second diode (D2) is reduced, the output of the primary and secondary coils (L2) starts to supply power to the modulation circuit, and the load control circuit is not started at this time, the first MOS tube (Q1) is closed, and the output load of the transformer (T) only has the supporting capacitor (C1), so that the starting speed is high;
step four: when the output voltage of the primary and secondary windings (L2) of the transformer (T) reaches the working threshold Vth1 of the load control circuit, the first MOS tube (Q1) is conducted, the load control circuit starts to output the voltage Vout1, and the output voltage of the transformer (T) is reduced under the influence of the fourth capacitor (C4) and the fifth capacitor (C5) at the load side;
and step five, after the first MOS tube (Q1) is conducted, the third resistor (R3) feeds Vout1 back to the base electrode of the second triode (Q2), and the second triode (Q2) is conducted, so that the conducting voltage of the first MOS tube (Q1) is reduced, the minimum threshold value of the required output voltage is reduced to the turn-off threshold value, and the condition that the output Vout1 is disconnected after being conducted is avoided.
5. The method of using a flyback power supply circuit for a charging pile of a charging and replacing cabinet according to claim 4, wherein the third resistor (R3) is an adjusting circuit, and the turn-off threshold is reduced by reducing the resistance value of the third resistor (R3), and the turn-off threshold is increased by increasing the resistance value of the third resistor (R3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311850127.8A CN117498704B (en) | 2023-12-29 | 2023-12-29 | Flyback power supply circuit for charging pile of charging and replacing cabinet and use method of flyback power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311850127.8A CN117498704B (en) | 2023-12-29 | 2023-12-29 | Flyback power supply circuit for charging pile of charging and replacing cabinet and use method of flyback power supply circuit |
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| CN117498704B true CN117498704B (en) | 2024-03-29 |
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