CN217307555U - Voltage conversion circuit and voltage conversion device - Google Patents
Voltage conversion circuit and voltage conversion device Download PDFInfo
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- CN217307555U CN217307555U CN202220353754.5U CN202220353754U CN217307555U CN 217307555 U CN217307555 U CN 217307555U CN 202220353754 U CN202220353754 U CN 202220353754U CN 217307555 U CN217307555 U CN 217307555U
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Abstract
The application discloses voltage conversion circuit and voltage conversion equipment, voltage conversion circuit include transformer, power branch road, partial pressure branch road and resistance branch road. The power supply branch is respectively connected with the voltage-dividing branch, the output end, the resistance branch and the transformer, and the resistance branch is respectively connected with the voltage-dividing branch and the transformer. The transformer is used for reducing the voltage of the input power supply and outputting the voltage to be processed between the first end of the transformer and the second end of the transformer. The power supply branch is used for generating a first voltage. The resistance branch circuit is used for generating a second voltage according to the output current of the first output end. The voltage division branch is used for obtaining a first output voltage according to the first voltage and obtaining a second output voltage according to the second voltage. The first output voltage is equal to the voltage to be processed, and the second output voltage is equal to the voltage drop on the lead. By the mode, the voltage drop of the lead can be compensated, and the stability of the power supply voltage of the load is improved.
Description
Technical Field
The present application relates to the field of electronic circuits, and more particularly, to a voltage conversion circuit and a voltage conversion device.
Background
At present, mobile terminals (such as smart phones) are more and more favored by consumers, but the mobile terminals have large power consumption and usually need to be charged frequently. In addition, the battery capacity of the mobile terminal is also increasing, and in order to meet the requirement of fast charging, the supply current of the power adapter needs to be increased continuously.
However, since the power adapter and the mobile terminal need to be connected by a wire, as the supply current is larger and larger, the voltage drop generated on the wire is also larger and larger, so that the actual charging voltage for the mobile terminal is smaller than the output voltage of the power adapter, and the charging time is longer.
SUMMERY OF THE UTILITY MODEL
The application aims at providing a voltage conversion circuit and voltage conversion equipment, and the application can compensate the voltage drop of the wire and improve the stability of the power supply voltage of the load.
To achieve the above object, in a first aspect, the present application provides a voltage conversion circuit, including:
the device comprises a transformer, a power supply branch, a voltage division branch and a resistance branch;
the first end of the power supply branch circuit is respectively connected with the first end of the voltage division branch circuit and the first end of the transformer, the second end of the power supply branch circuit is connected with the second end of the voltage division branch circuit, the third end of the power supply branch circuit is respectively connected with the first end of the resistance branch circuit, the second end of the resistance branch circuit is respectively connected with the third end of the voltage division branch circuit and the second end of the transformer, the third end of the transformer is connected with the first end of an input power supply, the fourth end of the transformer is connected with the second end of the input power supply, the first end of the transformer serves as a first output end, and the first end of the resistance branch circuit serves as a second output end;
the first output end and the second output end are used for connecting wires;
the transformer is used for reducing the voltage of the input power supply and outputting a voltage to be processed between a first end of the transformer and a second end of the transformer;
the power supply branch circuit is used for generating a first voltage when the voltage to be processed is greater than a preset voltage threshold;
the resistance branch circuit is used for generating a second voltage according to the output current of the first output end;
the voltage division branch is used for obtaining a first output voltage output between the first output end and the second output end according to the first voltage and obtaining a second output voltage output between the first output end and the second output end according to the second voltage;
the first output voltage is equal to the voltage to be processed, and the second output voltage is equal to the voltage drop on the lead.
In an alternative form, the power supply branch includes a voltage regulator;
the anode of the voltage stabilizer is connected with the first end of the resistance branch circuit, the cathode of the voltage stabilizer is respectively connected with the first end of the transformer and the first end of the voltage dividing branch circuit, and the reference end of the voltage stabilizer is connected with the second end of the voltage dividing branch circuit.
In an alternative form, the resistance value of the resistance branch is half of the total resistance of the conductor.
In an alternative mode, the resistance branch comprises a first resistance;
the first end of the first resistor is connected with the third end of the power supply branch circuit, and the second end of the first resistor is respectively connected with the third end of the voltage division branch circuit and the second end of the transformer.
In an optional mode, the voltage dividing branch comprises a second resistor and a third resistor;
the first end of the second resistor is connected with the first end of the transformer, the second end of the second resistor is respectively connected with the first end of the third resistor and the second end of the power branch, and the second end of the third resistor is respectively connected with the second end of the resistor branch and the second end of the transformer.
In an optional mode, the voltage conversion circuit further comprises a current limiting branch;
the current limiting branch is connected between the first end of the transformer and the first end of the power supply branch, and the current limiting branch is used for limiting the input current of the power supply branch.
In an alternative mode, the current limiting branch comprises a fourth resistor;
the first end of the fourth resistor is connected with the first end of the transformer, and the second end of the fourth resistor is connected with the first end of the power supply branch circuit.
In an optional mode, the voltage conversion circuit further comprises a filtering branch circuit;
the first end of the filtering branch circuit is connected with the first end of the power supply branch circuit, and the second end of the filtering branch circuit is connected with the second end of the power supply branch circuit;
the filtering branch circuit is used for filtering the voltage of the first end of the power supply branch circuit.
In an optional mode, the filtering branch circuit includes a first capacitor and a fifth resistor;
the first end of the first capacitor is connected with the first end of the power supply branch circuit, the second end of the first capacitor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the second end of the voltage dividing branch circuit.
In a second aspect, the present application provides a voltage conversion device comprising a voltage conversion circuit as described above.
The beneficial effect of this application is: the application provides a voltage conversion circuit includes transformer, power branch, partial pressure branch and resistance branch. When the voltage conversion circuit supplies power to the load through the conducting wire, on one hand, the first voltage output by the power supply branch circuit can output a first output voltage after passing through the voltage division branch circuit, the first output voltage is equal to the voltage to be processed output by the transformer, and the voltage to be processed is also the voltage which is actually required by the voltage conversion circuit to supply power to the load; on the other hand, the resistance branch circuit can generate a second voltage according to the output current of the first output end, the second voltage can output a second output voltage after passing through the voltage division branch circuit, and the second output voltage is equal to the voltage drop on the lead, namely, the compensation of the voltage drop on the lead is realized. Therefore, the voltage actually supplied to the load by the voltage conversion circuit can be prevented from being reduced due to the voltage drop on the lead, that is, the stability of the supply voltage of the load can be improved.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a voltage conversion circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a voltage conversion circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of an output voltage and an output current of a voltage conversion circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of an output voltage and an output current of a voltage converting circuit according to another embodiment of the present disclosure;
fig. 5 is a schematic circuit structure diagram of a voltage conversion circuit according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a voltage conversion circuit according to an embodiment of the present disclosure. As shown in fig. 1, the voltage conversion circuit 100 includes a power branch 101, a voltage dividing branch 102, a resistance branch 103, and a transformer 104. The first end of the power branch 101 is connected to the first end of the first transformer 104 of the voltage dividing branch 102, the second end of the power branch 101 is connected to the second end of the voltage dividing branch 102, the third end of the power branch 101 is connected to the first end of the resistor branch 103, the second end of the resistor branch 103 is connected to the third end of the voltage dividing branch 102 and the second end of the transformer 104, the third end of the transformer 104 is connected to the first end of the input power source 300, the fourth end of the transformer 104 is connected to the second end of the input power source 300, the first end of the transformer 104 is used as the first output terminal VOUT1, and the first end of the resistor branch 103 is used as the second output terminal VOUT 2.
Specifically, the first output terminal VOUT1 and the second output terminal VOUT2 are used for connecting wires, the transformer 104 is used for stepping down the input power 300 and outputting a voltage to be processed between a first terminal of the transformer 104 and a second terminal of the transformer 104, and the power branch 101 is used for generating a first voltage when the voltage to be processed is greater than a preset voltage threshold. The resistor branch 103 is used for generating a second voltage according to the output current of the first output terminal VOUT 1. The voltage dividing branch 102 is configured to obtain a first output voltage output between the first output terminal VOUT1 and the second output terminal VOUT2 according to the first voltage, and obtain a second output voltage output between the first output terminal VOUT1 and the second output terminal VOUT2 according to the second voltage. The first output voltage is equal to the voltage to be processed output by the transformer 104, and the second output voltage is equal to the voltage drop on the wire.
The preset voltage threshold may be set according to an actual application, and the embodiment of the present application does not specifically limit this. For example, the corresponding setting is performed according to the selected electronic components of the power branch 101.
In this embodiment, when the voltage conversion circuit 100 supplies power to a load through a wire, the sum of two output voltages is substantially output between the first output terminal VOUT1 and the second output terminal VOUT2, wherein one voltage is used for supplying power to the load, i.e., serving as a supply voltage of the load, and the other voltage is used for compensating for a voltage drop of the wire. Specifically, on one hand, the first voltage output by the power supply branch 101 may output a first output voltage after passing through the voltage dividing branch 102, and the first output voltage is equal to the voltage (i.e. the voltage to be processed) output by the transformer 104, and the voltage output by the transformer 104 is the voltage that the voltage conversion circuit 100 actually needs to supply power to the load, so that the first output voltage is the voltage that the voltage conversion circuit 100 actually needs to supply power to the load. On the other hand, the resistance branch circuit 103 may generate a second voltage according to the output current of the first output terminal VOUT1, where the second voltage may output a second output voltage after passing through the voltage dividing branch circuit 102, and the second output voltage is equal to the voltage drop on the wire. That is, the second output voltage is used as compensation for the voltage drop on the wire. Accordingly, it is possible to prevent the voltage that the voltage conversion circuit 100 actually supplies to the load from being reduced due to the voltage drop on the wire, that is, to improve the stability of the supply voltage of the load.
In one embodiment, as shown in fig. 2, power branch 101 includes a voltage regulator U1. An anode of the voltage stabilizer U1 is connected to the first end of the resistor branch 103, a cathode of the voltage stabilizer U1 is connected to the first end of the transformer 104 and the first end of the voltage dividing branch 102, and a reference terminal of the voltage stabilizer U1 is connected to the second end of the voltage dividing branch 102.
Specifically, the voltage regulator U1 is configured to provide a reference voltage, i.e., the voltage between the anode of the voltage regulator U1 and the reference terminal is a constant voltage, which is the first voltage. In one embodiment, the voltage regulator U1 may be a three-terminal adjustable shunt reference source model LM431, where the voltage between the anode and the reference terminal of LM431 is constant at 2.5 v.
In an embodiment, the resistance value of the resistive branch 103 is half of the total resistance of the wire, so as to perform better and accurate compensation on the voltage drop on the wire, and further improve the stability of the supply voltage of the load.
In one embodiment, the resistive branch 103 includes a first resistor R1. A first end of the first resistor R1 is connected to the third end of the power branch 101, and a second end of the first resistor R1 is connected to the third end of the voltage dividing branch 102 and the second end of the transformer 104, respectively.
In this embodiment, when the voltage conversion circuit 100 supplies power to the load through the wire, the output current of the first output terminal VOUT1 flows through the first resistor R1, and the current can generate the second voltage across the first resistor R1.
In one embodiment, the voltage dividing branch 102 includes a second resistor R2 and a third resistor R3. A first end of the second resistor R2 is connected to a first end of the transformer 104, a second end of the second resistor R2 is connected to a first end of the third resistor R3 and a second end of the power branch 101, and a second end of the third resistor R3 is connected to a second end of the resistor branch 103 and a second end of the transformer 104.
Specifically, the second resistor R2 and the third resistor R3 are used for dividing a total voltage between the first output terminal VOUT1 and the second output terminal VOUT2, wherein the total voltage between the first output terminal VOUT1 and the second output terminal VOUT2 is a sum of the first output voltage and the second output voltage. That is, the voltage across the third resistor R3 is a portion of the total voltage between the first output terminal VOUT1 and the second output terminal VOUT 2. Meanwhile, since the current of the third resistor R3 flows from the first end to the second end of the third resistor R3, and the current of the first resistor R1 flows from the first end to the second end of the first resistor R1, the difference between the voltage between the first end and the second end of the third resistor R3 and the voltage between the first end and the second end of the first resistor R1 is the reference voltage (i.e., the first voltage) output by the regulator U1. It can be seen that the voltage between the first terminal and the second terminal of the third resistor R3 is related to the voltage between the first terminal and the second terminal of the first resistor R1 (i.e., the second voltage) and the first voltage at the same time. Accordingly, a first output voltage of the first voltage output between the first output terminal VOUT1 and the second output terminal VOUT2 and a second output voltage of the second voltage output between the first output terminal VOUT1 and the second output terminal VOUT2 can be obtained with the third resistor R3 as an intermediate variable, respectively.
In an embodiment, the voltage converting circuit 100 further includes a current limiting branch 105. The current limiting branch 105 is connected between the first end of the transformer 104 and the first end of the power supply branch 101.
Specifically, the current limiting branch 105 is used to limit the input current of the power supply branch 101 to prevent the power supply branch 101 from being damaged due to excessive current.
In one embodiment, current limiting branch 105 includes a fourth resistor R4. A first end of the fourth resistor R4 is connected to a first end of the transformer 104, and a second end of the fourth resistor R4 is connected to a first end of the power branch 101.
Specifically, the fourth resistor R4 functions as a current limiting resistor.
In one embodiment, the voltage converting circuit 100 further includes a filtering branch 106. A first end of the filtering branch 106 is connected to a first end of the power branch 101, and a second end of the filtering branch 106 is connected to a second end of the power branch 101.
In particular, the filtering branch 106 is configured to filter a voltage at a first terminal of the power branch 101.
In one embodiment, the filtering branch 106 includes a first capacitor C1 and a fifth resistor R5. The first end of the first capacitor C1 is connected to the first end of the power branch 101, the second end of the first capacitor C1 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected to the second end of the power branch 101.
In this embodiment, the first capacitor C1 and the fifth resistor R5 are used to filter the operating power between the cathode and the reference of the regulator U1 to reduce the interference of the alternating ripple on the regulator U1.
The operation principle of the circuit structure shown in fig. 2 is described below, and the model LM431 of the regulator U1 is taken as an example, and the resistance value of the second resistor R2 is equal to the resistance value of the third resistor R3. Meanwhile, the voltage required by the voltage conversion circuit 100 to power the load is actually 5 v.
When the voltage conversion circuit 100 supplies power to a load through a wire, it is assumed that the output current of the voltage conversion circuit 100 is Iout, i.e., the output current of the first output terminal VOUT1 is Iout, and the total output voltage of the voltage conversion circuit 100 is VOUT, i.e., the total voltage between the first output terminal VOUT1 and the second output terminal VOUT2 is VOUT. At this time, since the reference voltage of the LM431 is 2.5V, the voltage between the first terminal of the first resistor R1 and the first terminal of the third resistor R3 is 2.5V. Meanwhile, in the above embodiment, the current direction of the first resistor R1 is from left to right, and the direction of the third resistor R3 is from top to bottom, so the difference between the voltage VR3 of the third resistor R3 and the voltage VR1 of the first resistor R1 is the reference voltage of the LM431, and the following results are obtained:
2.5＝VR3-VR1＝VR3-Iout*r1(1)
wherein R1 is the resistance of the first resistor R1.
For the voltage dividing branch 102, it can be:
VR3＝Vout/(r2+r3)*r3＝Vout/(r2+r2)*r2＝Vout/2(2)
wherein R2 is the resistance of the second resistor R2, and R3 is the resistance of the third resistor R3.
Combining equations (2) and (3) yields:
2.5＝Vout/2-Iout*r1(3)
transforming equation (3) can obtain:
Vout＝(Iout*r1+2.5)*2＝2.5*2+Iout*r1*2(4)
where the portion 2.5 × 2 in equation (4) is the portion of the voltage conversion circuit 100 that actually needs to supply power to the load, and the portion Iout × r1 × 2 in equation (4) is the portion for compensating for the voltage drop on the wire.
Furthermore, in an embodiment, since the current of the wire is also the output current Iout, the voltage drop on the wire can be completely compensated by setting the resistance value R1 of the first resistor R1 to be half of the total resistance of the wire.
For example, in one embodiment, when the resistance of the wire (e.g., cable) from the voltage conversion circuit 100 to the load is 0.5 ohm, if the first resistor R1 is not connected, the output voltage and the output current of the voltage conversion circuit 100 are as shown in fig. 3, where a curve L1 is a variation curve of the output voltage and the output current of the voltage conversion circuit 100. It can be seen that when the output current is 2A, the voltage drop across the line is 1 v. The actual supply voltage of the load is then 5v-1 v-4 v.
After the first resistor R1 is added for compensation, the output voltage and the output current of the voltage converting circuit 100 are as shown in fig. 4, wherein a curve L2 is a variation curve of the output voltage and the output current of the voltage converting circuit 100. The resistance value of the first resistor R1 is set to be half of the total resistance of the wire, i.e., R1 is 0.25 ohms, and the voltage for compensation at the first resistor R1 is Iout × R1 × 2 — 2A × 0.25 Ω × 2 — 1v, so that the actual supply voltage of the load is 5v +1v-1 v. Accordingly, it is possible to prevent the voltage that the voltage conversion circuit 100 actually supplies to the load from being reduced due to the voltage drop on the wire, that is, to improve the stability of the supply voltage of the load.
In one embodiment, as shown in figure 5, the voltage conversion circuit further includes a fuse F1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a first zener diode U2, a second zener diode U3, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R9, an eleventh resistor R9, a twelfth resistor R9, a thirteenth resistor R9, a fourteenth resistor R9, a fifteenth switch U9, a first optocoupler Q chip, and a second optocoupler chip.
Wherein, a first end of the fuse F1 is connected to a first end of the input power source 300, a second end of the fuse F1 is connected to an anode of the first diode D1 and a cathode of the third diode D3, a cathode of the first diode D1 is connected to a cathode of the second diode D2, a first end of the second capacitor C2 and a first end of the second transformer L1, a second end of the input power source 200 is connected to an anode of the second diode D2 and a cathode of the fourth diode D4, a cathode of the third diode D3 is connected to a cathode of the fourth diode D4, a second end of the second capacitor C2 and a second end of the second transformer L1, a third end of the second transformer L1 is connected to a first end of the third capacitor C1, a first end of the sixth resistor R6, a first end of the eighth resistor R8, a first end of the fifth capacitor C5, a first end of the thirteenth resistor R13, a first end of the sixth resistor R6 and a first end of the transformer L46104, a second end of the sixth resistor R6 is connected to a first end of the seventh resistor R7, a second end of the seventh resistor R7 is connected to a first end of the eleventh resistor R11 and a first end of the main control chip U4, a second end of the eighth resistor R8 is connected to a first end of the ninth resistor R9, a second end of the ninth resistor R9 is connected to a second end of the main control chip U4, a second end of the fifth capacitor C5 is connected to a first end of the twelfth resistor R12 and a first end of the fourteenth resistor R14, a second end of the fourteenth resistor R14 is connected to a second end of the thirteenth resistor R13, a second end of the twelfth resistor R12 is connected to a cathode of the fifth diode D5, an anode of the fifth diode D5 is connected to a second end of the first switch tube Q1 and a first end of the fourth capacitor C4, a first end of the first switch tube Q1 is connected to a third end of the main control chip U4, and a second end of the fourth resistor R10 is connected to a tenth end of the fourth resistor R4, a first end of a seventh capacitor C7 is connected to the fourth end of the main control chip U4, the first end of a fifteenth resistor R15 and the first end of the optocoupler U5, a second end of the fifteenth resistor R15 is connected to the first end of the eighth resistor R8, a fourth end of the second transformer L1 is connected to the second end of the third capacitor, the second end of the tenth resistor R10, the third end of the first switch tube Q1, the second end of the eleventh resistor R11, the fifth end of the main control chip U4, the second end of the sixth capacitor C6, the second end of the eighth capacitor C8, the second end of the ninth capacitor C9, the second end of the tenth capacitor C10 and the anode of the sixth diode D6, a first end of the tenth capacitor C10 is connected to the first end of the transformer 104, the first end of the eleventh capacitor C11, the first end of the twelfth capacitor C12, the first end of the first capacitor C5, the first end of the thirteenth capacitor C14, the first end of the fourteenth capacitor R14 and the second end of the second capacitor R57324, a second end of the transformer 104 is connected to a first end of a sixteenth resistor R16, a cathode of the first zener diode U2, and a cathode of the second zener diode U3, respectively, a second end of the sixteenth resistor R16 is connected to a first end of a ninth capacitor C9, a second end of the ninth capacitor C9 is connected to an anode of the first zener diode U2, an anode of the second zener diode U3, and a second end of the eleventh capacitor C11, respectively, a second end of the twelfth capacitor C12, a second end of the thirteenth capacitor C13, a second end of the fourteenth capacitor C14, a second end of the first resistor R1, and a second end of the third resistor R3 are connected, a fifth end of the transformer 104 is connected to the first end of the ninth capacitor C9 and the second end of the optocoupler U5, a sixth end of the transformer 104 is connected to the cathode of the sixth diode D6, a third end of the optocoupler U5 is connected to the second end of the fourth resistor R4, and a fourth end of the optocoupler U5 is connected to the first end of the first capacitor C1 and the cathode of the regulator U1.
In this embodiment, the fuse F1 is used for overcurrent protection, and when the system current exceeds the fusing current of the fuse F1, the fuse F1 will be fused to protect the following electronic components from damage.
The first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 form a bridge rectifier circuit, and rectify the alternating current into direct current.
The second capacitor C2, the second transformer L1, and the third capacitor C3 are filter and tank circuits.
The fifth capacitor C5, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14 and the fifth diode D5 form a peak voltage absorption circuit to absorb leakage inductance of the transformer 104 when the first switch Q1 is turned off.
The fourth capacitor C4, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 form peripheral circuit elements of the main control chip U4, so as to supply power to the main control chip U4 and control output power.
The optocoupler U5, a secondary winding of the transformer 104, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a fifteenth resistor R15 and a sixth diode D6 form a feedback circuit for stabilizing the output voltage. Specifically, when the voltage conversion circuit outputs an external current to cause a decrease in the output voltage of the voltage conversion circuit, the current flowing into the fourth terminal of the main control chip U4 decreases, so that the main control chip U4 increases the time for the first switching tube Q1 to be conducted with the primary coil of the transformer 104, so as to increase the power output by the secondary winding of the transformer 104; when the current output from the voltage conversion circuit decreases and the voltage output from the voltage conversion circuit increases, the current flowing into the fourth terminal of the main control chip U4 increases, so that the main control chip U4 decreases the time for the first switching tube Q1 and the primary winding of the transformer 104 to be turned on, so that the power output from the secondary winding of the transformer 104 decreases, and the voltage output from the voltage conversion circuit is constant.
The first zener diode U2, the second zener diode U3, the eleventh capacitor C11, the twelfth capacitor C12, the thirteenth capacitor C13, the fourteenth capacitor C14, and the second inductor L2 form an output rectifying and filtering circuit. In the embodiments shown in the above figures, the expression of the resistor is a single resistor, and the expression of the capacitor is a single capacitor. In other embodiments, the resistor may also be an integration of series, parallel or series-parallel resistors, and the capacitor may also be an integration of series, parallel or series-parallel capacitors.
The connection described herein may be a direct connection, i.e., a connection between two components, or an indirect connection, i.e., an indirect connection between two components may be formed through one or more elements.
The embodiment of the present application further provides a voltage conversion device, which includes the voltage conversion circuit in any embodiment of the present application.
In one embodiment, the voltage conversion device is a power adapter.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments may also be combined, the steps may be implemented in any order and there are many other variations of the different aspects of the present application described above which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should 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 these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A voltage conversion circuit, comprising:
the device comprises a transformer, a power supply branch, a voltage division branch and a resistance branch;
the first end of the power supply branch circuit is respectively connected with the first end of the voltage division branch circuit and the first end of the transformer, the second end of the power supply branch circuit is connected with the second end of the voltage division branch circuit, the third end of the power supply branch circuit is respectively connected with the first end of the resistance branch circuit, the second end of the resistance branch circuit is respectively connected with the third end of the voltage division branch circuit and the second end of the transformer, the third end of the transformer is connected with the first end of an input power supply, the fourth end of the transformer is connected with the second end of the input power supply, the first end of the transformer serves as a first output end, and the first end of the resistance branch circuit serves as a second output end;
the first output end and the second output end are used for connecting wires;
the transformer is used for reducing the voltage of the input power supply and outputting a voltage to be processed between a first end of the transformer and a second end of the transformer;
the power supply branch circuit is used for generating a first voltage when the voltage to be processed is greater than a preset voltage threshold;
the resistance branch circuit is used for generating a second voltage according to the output current of the first output end;
the voltage division branch is used for obtaining a first output voltage output between the first output end and the second output end according to the first voltage and obtaining a second output voltage output between the first output end and the second output end according to the second voltage;
the first output voltage is equal to the voltage to be processed, and the second output voltage is equal to the voltage drop on the lead.
2. The voltage conversion circuit of claim 1, wherein the power branch comprises a voltage regulator;
the anode of the voltage stabilizer is connected with the first end of the resistance branch circuit, the cathode of the voltage stabilizer is respectively connected with the first end of the transformer and the first end of the voltage dividing branch circuit, and the reference end of the voltage stabilizer is connected with the second end of the voltage dividing branch circuit.
3. The voltage conversion circuit of claim 1, wherein the resistive branch has a resistance value that is half of a total resistance of the conductive line.
4. The voltage conversion circuit of claim 1 or 3, wherein the resistive branch comprises a first resistor;
the first end of the first resistor is connected with the third end of the power supply branch circuit, and the second end of the first resistor is respectively connected with the third end of the voltage division branch circuit and the second end of the transformer.
5. The voltage conversion circuit of claim 1, wherein the voltage dividing branch comprises a second resistor and a third resistor;
the first end of the second resistor is connected with the first end of the transformer, the second end of the second resistor is respectively connected with the first end of the third resistor and the second end of the power supply branch circuit, and the second end of the third resistor is respectively connected with the second end of the resistor branch circuit and the second end of the transformer.
6. The voltage conversion circuit of claim 1, further comprising a current limiting branch;
the current limiting branch is connected between the first end of the transformer and the first end of the power supply branch, and the current limiting branch is used for limiting the input current of the power supply branch.
7. The voltage conversion circuit of claim 6, wherein the current limiting branch comprises a fourth resistor;
the first end of the fourth resistor is connected with the first end of the transformer, and the second end of the fourth resistor is connected with the first end of the power supply branch circuit.
8. The voltage conversion circuit of claim 1, further comprising a filtering branch;
the first end of the filtering branch is connected with the first end of the power supply branch, and the second end of the filtering branch is connected with the second end of the power supply branch;
the filtering branch circuit is used for filtering the voltage of the first end of the power supply branch circuit.
9. The voltage conversion circuit of claim 8, wherein the filter branch comprises a first capacitor and a fifth resistor;
the first end of the first capacitor is connected with the first end of the power supply branch circuit, the second end of the first capacitor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the second end of the power supply branch circuit.
10. A voltage conversion apparatus comprising the voltage conversion circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220353754.5U CN217307555U (en) | 2022-02-21 | 2022-02-21 | Voltage conversion circuit and voltage conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220353754.5U CN217307555U (en) | 2022-02-21 | 2022-02-21 | Voltage conversion circuit and voltage conversion device |
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| Publication Number | Publication Date |
|---|---|
| CN217307555U true CN217307555U (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220353754.5U Active CN217307555U (en) | 2022-02-21 | 2022-02-21 | Voltage conversion circuit and voltage conversion device |
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| Country | Link |
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| CN (1) | CN217307555U (en) |
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