CN218216797U - Voltage conversion circuit of charger - Google Patents
Voltage conversion circuit of charger Download PDFInfo
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- CN218216797U CN218216797U CN202222410310.3U CN202222410310U CN218216797U CN 218216797 U CN218216797 U CN 218216797U CN 202222410310 U CN202222410310 U CN 202222410310U CN 218216797 U CN218216797 U CN 218216797U
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Abstract
The utility model discloses a voltage conversion circuit of a charger, which belongs to the field of conversion circuits and comprises a rectification filter circuit and a power supply switching circuit; the power supply switching circuit comprises a switching power supply chip U; the power switching circuit further comprises a first diode D1, a second diode D2, a diode resistor Rd, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first P-type MOS transistor Q1, a second P-type MOS transistor Q3, a third P-type MOS transistor Q4, a first triode Q2, a second triode Q5 and a third triode Q6. The utility model discloses a to the design of the voltage conversion circuit who charges the machine for when it charges through municipal power, carry out automatic switch-over to charging of battery, when not charging, be full of the battery automatically, switch over by oneself between both charging circuit dual supplies.
Description
Technical Field
The utility model relates to a converting circuit technical field especially relates to a voltage conversion circuit who charges machine.
Background
The charger adopts a high-frequency power supply technology and applies an advanced intelligent dynamic adjustment charging technology. The intelligent three-stage charging mode of constant current, constant voltage and small constant current is adopted, and the intelligent three-stage charging device has the characteristics of high charging efficiency, simplicity in operation, light weight, small size and the like. However, the current charger only realizes the function of outputting after converting the high-voltage current when charging, and the current charger can be used only by ensuring the current supply and is not suitable for the power failure environment;
patent document No. 201520213271.5 discloses a voltage conversion circuit of a charger, which can convert voltage, but the output power supply of the charger cannot be switched, and only the voltage conversion can be realized by an external power supply, and when municipal voltage is unstable, the charger does not have a voltage stabilizing and reducing function, so that the circuit is easily burnt.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem existing in the prior art, and the voltage conversion circuit of the machine that charges that provides.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a voltage conversion circuit of a charger comprises a rectification filter circuit and a power supply switching circuit; the power supply switching circuit comprises a switching power supply chip U; the power supply switching circuit further comprises a first diode D1, a second diode D2, a diode resistor Rd, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first P-type MOS transistor Q1, a second P-type MOS transistor Q3, a third P-type MOS transistor Q4, a first triode Q2, a second triode Q5 and a third triode Q6;
the power switching circuit further comprises a first VIN terminal, a second VIN terminal, a first VBAT terminal, a second VBAT terminal and a VCC terminal.
Preferably, the first VIN terminal is connected to one end of the first diode D1, one end of the second diode D2 is connected to the first diode D1, the other end of the second diode is connected to the first resistor R1 and the diode resistor Rd, and the other end of the diode resistor Rd is grounded.
Preferably, the first end of the third triode Q6 is connected with the first resistor R1, the second end is connected with the second resistor R2, the third end is connected with the third resistor R3 and the fourth resistor R4, the other end of the second resistor R2 is grounded, and the other end of the fourth resistor R4 is connected with the first VBAT end.
Preferably, the first end of the second triode Q5 is connected to one end of a third resistor R3, the second end is connected to a fifth resistor R5, the third end is connected to one end of a second P-type MOS transistor Q4, and the other end of the fifth resistor R5 is grounded.
Preferably, a first end of the first triode Q2 is connected with the eighth resistor R8, a second end is connected with the first P-type MOS transistor Q1 and the ninth resistor R9, and a third end is grounded; the second VIN end is connected with a first P-type MOS tube Q1, an eighth resistor R8 and a second P-type MOS tube Q3, the second VIN end is connected with a seventh resistor R7, and the other end of the seventh resistor R7 is grounded.
Preferably, one end of the VCC terminal is connected to the first P-type MOS transistor Q1, the ninth resistor R9, and the second P-type MOS transistor Q3.
Preferably, the VCC terminal is a voltage input terminal of the switching power supply chip U, and the other end of the switching power supply chip U is connected to the rectification filter circuit.
Compared with the prior art, the beneficial effects of the utility model are that:
this scheme is through the design to the voltage conversion circuit that charges for when it charges through municipal power, carry out automatic switch-over to the charging of battery, when not charging, be full of to the battery automatically, switch over between both charging circuit dual supply.
Drawings
Fig. 1 is a conversion circuit diagram of a voltage conversion circuit of a charger according to the present invention;
fig. 2 is a circuit diagram of the power source automatic switching circuit in the voltage conversion circuit of the charger provided by the utility model.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without creative work belong to the scope of protection of the present invention based on the embodiments of the present invention.
Referring to fig. 1-2, a voltage conversion circuit of a charger includes a rectification filter circuit and a power switching circuit;
the power supply switching circuit comprises a switching power supply chip U; the power supply switching circuit further comprises a first diode D1, a second diode D2, a diode resistor Rd, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first P-type MOS tube Q1, a second P-type MOS tube Q3, a third P-type MOS tube Q4, a first triode Q2, a second triode Q5 and a third triode Q6;
the power supply switching circuit further comprises a first VIN end, a second VIN end, a first VBAT end, a second VBAT end and a VCC end; the first VBAT end and the second VBAT end are both battery voltage;
three MOSFETs are used in a main power supply path, and after the MOSFETs are completely conducted, the voltage drop of the MOSFETs is far smaller than that of a Schottky diode (only zero to several volts), so that the conduction loss of the MOSFETs is very low;
the first VIN end is connected with one end of a first diode D1, one end of a second diode D2 is connected with the first diode D1, the other end of the second diode D2 is connected with a first resistor R1 and a diode resistor Rd, and the other end of the diode resistor Rd is grounded.
The first end of a third triode Q6 is connected with the first resistor R1, the second end is connected with the second resistor R2, the third end is connected with the third resistor R3 and the fourth resistor R4, the other end of the second resistor R2 is grounded, the other end of the fourth resistor R4 is connected with the first VBAT end, the first end of the second triode Q5 is connected with one end of the third resistor R3, the second end is connected with the fifth resistor R5, the third end is connected with one end of the second P-type MOS transistor Q4, and the other end of the fifth resistor R5 is grounded.
Although the three triodes additionally increase some power loss, because the triodes work in a complete saturation state, under the condition of certain saturation conduction voltage drop, conduction current can be set to be relatively small through a resistance value, and therefore power consumption is not too high;
the first end of the first triode Q2 is connected with the eighth resistor R8, the second end of the first triode Q2 is connected with the first P-type MOS transistor Q1 and the ninth resistor R9, and the third end of the first triode Q2 is grounded; the second VIN end is connected with the first P-type MOS tube Q1, the eighth resistor R8 and the second P-type MOS tube Q3, the second VIN end is connected with the seventh resistor R7, the other end of the seventh resistor R7 is grounded, one end of the VCC end is connected with the first P-type MOS tube Q1, the ninth resistor R9 and the second P-type MOS tube Q3, the VCC end is a voltage input end of the switching power supply chip U, and the other end of the switching power supply chip U is connected with the rectification filter circuit.
It should be noted that: the rectification filter circuit is the prior art in a comparison document, and the scheme is a design for switching a power supply;
the working principle of the method is briefly introduced as follows: when an external power supply (municipal power supply) is used for the first VIN, the third triode Q6 is conducted, the second triode Q5 is cut off, and the grid electrode and the source electrode of the third P-type MOSFET Q4 are both connected with the first battery voltage VBAT end through the sixth resistor R6, so that the two ends are equal, and the first battery voltage VBAT end cannot reach the output end VCC end;
when the second VIN end of the external power supply (a storage battery power supply) is switched on, the second VIN end firstly reaches the output VCC through the parasitic diode of the first P-type MOSFET Q1, meanwhile, the first triode Q2 is switched on, so that the grid electrode of the first P-type MOSFET Q1 is pulled down to GND which is a low level, therefore, the grid-source voltage of the first P-type MOSFET Q1 is less than 0 and reaches the conduction threshold level, the first P-type MOSFET Q1 is switched on, then the parasitic diode in the first P-type MOSFET Q1 is cut off, and the external power supply VIN reaches the output VCC through the first P-type MOSFET Q1. At this time, the gate-source voltages of the second P-type MOSFET tube Q3 are close to be equal, and the second P-type MOSFET tube Q3 and the body diode are both cut off, so that the irregular charging of the battery by the first VIN of the external power supply is prevented;
when no external power supply (municipal power supply) is provided with the first VIN, the third triode Q6 is cut off, the second triode Q5 is conducted, the grid voltage of the third P-type MOSFET Q4 is at a low level, the grid source voltage is less than 0 and reaches a conduction threshold level, the third P-type MOSFET Q4 is conducted, then the output end VCC is reached through a parasitic diode of the Q5, the grid of the second P-type MOSFET Q3 is at a low level, therefore, the grid source voltage is less than 0, the second P-type MOSFET Q3 is conducted, the parasitic diode is cut off, the battery voltage reaches the output end VCC, and the effect of directly supplying power through the municipal power supply is realized;
meanwhile, the circuit can be used no matter whether the voltage of the battery is greater than that of an external power supply or not, and the universality is relatively wide.
The above, only be the embodiment of the preferred of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, which are designed to be replaced or changed equally, all should be covered within the protection scope of the present invention.
Claims (7)
1. A voltage conversion circuit of a charger is characterized by comprising a rectification filter circuit and a power supply switching circuit;
the power supply switching circuit comprises a switching power supply chip U;
the power supply switching circuit further comprises a first diode D1, a second diode D2, a diode resistor Rd, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first P-type MOS tube Q1, a second P-type MOS tube Q3, a third P-type MOS tube Q4, a first triode Q2, a second triode Q5 and a third triode Q6;
the power switching circuit further comprises a first VIN end, a second VIN end, a first VBAT end, a second VBAT end and a VCC end.
2. The voltage conversion circuit of the charging machine according to claim 1, characterized in that the first VIN terminal is connected to one terminal of the first diode D1, one terminal of the second diode D2 is connected to the first diode D1, the other terminal is connected to the first resistor R1 and the diode resistor Rd, and the other terminal of the diode resistor Rd is grounded.
3. The voltage conversion circuit of the charger according to claim 1, wherein a first end of the third triode Q6 is connected to a first resistor R1, a second end is connected to a second resistor R2, a third end is connected to a third resistor R3 and a fourth resistor R4, the other end of the second resistor R2 is grounded, and the other end of the fourth resistor R4 is connected to the first VBAT terminal.
4. The voltage conversion circuit of the charger according to claim 1, wherein a first end of the second triode Q5 is connected to one end of a third resistor R3, a second end of the second triode Q5 is connected to a fifth resistor R5, a third end of the second triode Q5 is connected to one end of a second P-type MOS transistor Q4, and the other end of the fifth resistor R5 is grounded.
5. The voltage conversion circuit of the charger according to claim 1, wherein a first end of the first triode Q2 is connected with an eighth resistor R8, a second end is connected with the first P-type MOS transistor Q1 and a ninth resistor R9, and a third end is grounded;
the second VIN end is connected with a first P-type MOS tube Q1, an eighth resistor R8 and a second P-type MOS tube Q3, the second VIN end is connected with a seventh resistor R7, and the other end of the seventh resistor R7 is grounded.
6. The voltage conversion circuit of the charger according to claim 1, wherein one end of the VCC terminal is connected to a first P-type MOS transistor Q1, a ninth resistor R9, and a second P-type MOS transistor Q3.
7. The voltage conversion circuit of the charger according to claim 1, wherein the VCC terminal is a voltage input terminal of a switching power supply chip U, and the other terminal of the switching power supply chip U is connected to the rectification filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222410310.3U CN218216797U (en) | 2022-09-09 | 2022-09-09 | Voltage conversion circuit of charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222410310.3U CN218216797U (en) | 2022-09-09 | 2022-09-09 | Voltage conversion circuit of charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218216797U true CN218216797U (en) | 2023-01-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222410310.3U Active CN218216797U (en) | 2022-09-09 | 2022-09-09 | Voltage conversion circuit of charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218216797U (en) |
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2022
- 2022-09-09 CN CN202222410310.3U patent/CN218216797U/en active Active
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