Direct-current buck-boost charger

Abstract

The invention provides a direct-current buck-boost charger, which relates to the technical field of chargers and comprises a power supply circuit, a buck-boost circuit and a main control circuit. The power supply circuit comprises a generator power supply and a solar panel power supply, the generator power supply realizes conduction of MOS13 and MOS14 by controlling triodes Q6 and Q10, and then the voltage is input to the buck-boost circuit; power supplied by the solar panel controls triodes Q7 and Q11 to conduct the MOS17, and then the MOS17 is input to the buck-boost circuit. The output end of the buck-boost circuit is electrically connected with the output end of the charger. Power supply to the buck-boost circuit is achieved through input of two kinds of energy of the generator and solar energy and connection and disconnection of an MOS tube and a triode, then charging of multiple sets of standby batteries is achieved through the main control circuit, and it is ensured that the standby batteries can be charged in various environments.

Description

Technical Field

[0001] The present invention relates to the technical field of chargers, and in particular to a direct current buck-boost charger. Background Art

[0002] In traditional cars, the electric energy is generally provided by the car generator. By setting the corresponding circuit, the electric energy of the car generator is designed into a charger structure to power the various electrical appliances in the vehicle. The charger is a charging device that adopts high-frequency power supply technology and uses advanced intelligent dynamic adjustment charging technology.

[0003] In existing cars, the power of the charger can only be supplied by the car generator, which has a single power supply mode. If the generator works abnormally, other electrical appliances cannot be started. In addition, the single power supply mode also requires a large power generation capacity of the generator. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the energy supply of the automobile charger in the prior art is single. In order to overcome the above defects of the prior art, the present invention provides a DC buck-boost charger.

[0005] The present invention provides a DC buck-boost charger, comprising a power supply circuit, a buck-boost circuit and a main control circuit; the power supply circuit comprises a generator power supply and a solar panel power supply, the generator power supply comprises MOS13, MOS14, transistor Q6 and transistor Q10, the solar power supply comprises MOS17, transistor Q7 and transistor Q11;

[0006] The drain of MOS13 is electrically connected to the output end of the generator, the source of MOS13 is electrically connected to the source of MOS14, the gates of MOS13 and MOS14 are both electrically connected to the cathode of diode D34, the anode of diode D34 is electrically connected to the collector of transistor Q10, the emitter of transistor Q10 is electrically connected to the power supply, the base of transistor Q10 is electrically connected to the collector of transistor Q6, the emitter of transistor Q6 is grounded, and the base of transistor Q6 is electrically connected to the main control circuit;

[0007] The drain of MOS17 is electrically connected to the output end of the solar panel, the gate of MOS17 is electrically connected to the collector of transistor Q11, the emitter of transistor Q11 is electrically connected to the power supply, the base of transistor Q11 is electrically connected to the collector of transistor Q7, the emitter of transistor Q7 is grounded, and the collector of transistor Q7 is electrically connected to the main control circuit;

[0008] The drain of MOS14 and the source of MOS17 are both electrically connected to the power supply end of the buck-boost circuit, and the output end of the buck-boost circuit is electrically connected to the output end of the charger.

[0009] Compared with the prior art, the DC buck-boost charger disclosed in the present application has the following advantages: through two energy inputs, namely the generator and solar energy, and through the conduction and cutoff of the MOS tube and the transistor, the buck-boost circuit is powered, and then the main control circuit is used to charge multiple groups of backup batteries, ensuring that the backup batteries can be charged in various environments.

[0010] In a possible implementation manner, the charger output terminal is also electrically connected to an overcharge protection circuit.

[0011] Compared with the prior art, the overcharge protection circuit can avoid overcharging of the backup battery, facilitate the main control circuit to cut off the circuit in time, and ensure the safety of the backup battery.

[0012] In a possible implementation manner, the buck-boost circuit includes a buck-boost chip U1, and the buck-boost chip U1 is SC8701QDER.

[0013] In a possible implementation manner, the charger output terminal is electrically connected to a power supply terminal of the main control circuit through a power supply circuit.

[0014] Compared with the prior art, the power supply circuit is used to perform voltage stabilization and filtering, so as to output a stable working voltage to power the main control circuit, thereby ensuring that the main control circuit can work stably.

[0015] In a possible implementation, the main control circuit is electrically connected to a voltage detection circuit, which includes a first voltage detection module for detecting the voltage at the output end of the generator, a second voltage detection module for detecting the voltage at the output end of the solar panel, a third voltage detection module for detecting the voltage at the output end of the charger, and a fourth voltage detection module for detecting the starting voltage.

[0016] Compared with the prior art, by detecting multiple voltages, it is ensured that each circuit can work stably, preventing the voltage from being too high or too low, resulting in a failure to charge.

[0017] In a possible implementation, the main control circuit is electrically connected to a current detection circuit, and the current detection circuit includes a first current detection module for detecting the current at the output end of the generator, a second current detection module for detecting the current at the output end of the solar panel, a third current detection module for detecting the current of the temperature sensor, a fourth current detection module for detecting the current at the output end of the charger, and a comparator U3;

[0018] The positive pole and negative pole of the comparator U3 are electrically connected to one end of the main control circuit respectively, the first current detection module, the second current detection module, the third current detection module and the fourth current detection module are all electrically connected to the positive pole of the comparator U3, and the output end of the comparator U3 is electrically connected to the buck-boost circuit.

[0019] Compared with the prior art, each current is detected and all currents are combined to monitor the total current, thereby preventing the current from exceeding the standard and causing spontaneous combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A circuit diagram of a power supply circuit, a buck-boost circuit, an overcharge protection circuit and a current detection circuit in a DC buck-boost charger of the present invention;

[0021] Figure 2 The present invention is a circuit diagram of a power supply circuit, a main control circuit and a voltage detection circuit in a DC buck-boost charger. DETAILED DESCRIPTION

[0022] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0023] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0024] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] See also Figure 1-2 As shown, an embodiment of the present application discloses a DC buck-boost charger, including a power supply circuit, a buck-boost circuit and a main control circuit; the power supply circuit includes generator power supply and solar panel power supply, the generator power supply includes MOS13, MOS14, transistor Q6 and transistor Q10, and the solar power supply includes MOS17, transistor Q7 and transistor Q11.

[0026] The drain of MOS13 is electrically connected to the output end of the generator, the source of MOS13 is electrically connected to the source of MOS14, the gates of MOS13 and MOS14 are both electrically connected to the cathode of diode D34, the anode of diode D34 is electrically connected to the collector of transistor Q10, the emitter of transistor Q10 is electrically connected to the power supply, the base of transistor Q10 is electrically connected to the collector of transistor Q6, the emitter of transistor Q6 is grounded, and the base of transistor Q6 is electrically connected to the main control circuit;

[0027] The drain of MOS17 is electrically connected to the output end of the solar panel, the gate of MOS17 is electrically connected to the collector of transistor Q11, the emitter of transistor Q11 is electrically connected to the power supply, the base of transistor Q11 is electrically connected to the collector of transistor Q7, the emitter of transistor Q7 is grounded, and the collector of transistor Q7 is electrically connected to the main control circuit;

[0028] The drain of MOS14 and the source of MOS17 are both electrically connected to the power supply end of the buck-boost circuit, and the output end of the buck-boost circuit is electrically connected to the output end of the charger.

[0029] Through the two energy inputs of generator and solar energy, and through the conduction and cutoff of MOS tubes and transistors, the power supply to the buck-boost circuit is realized, and then the main control circuit is used to charge multiple sets of backup batteries, ensuring that the backup batteries can be charged in various environments.

[0030] The charger output terminal is also electrically connected to an overcharge protection circuit, which can prevent the backup battery from being overcharged, and facilitate the main control circuit to cut off the circuit in time to ensure the safety of the backup battery.

[0031] The overcharge protection circuit uses a comparator to compare the charging voltage of the current charger output terminal connected to the backup battery with the set voltage to determine whether it is overcharged.

[0032] In this embodiment, the buck-boost circuit includes a buck-boost chip U1 , and the buck-boost chip U1 is SC8701QDER.

[0033] The charger output terminal is electrically connected to the power supply terminal of the main control circuit through a power circuit. The power circuit is used to stabilize and filter the voltage, output a stable working voltage to power the main control circuit, and ensure that the main control circuit can work stably.

[0034] The power supply circuit includes a voltage stabilizing chip and a boost module. The voltage stabilizing chip stabilizes the voltage output from the charger output end into the voltage of the power supply end of the main control circuit. At the same time, the boost module supplies power to other circuits by boosting the voltage to a preset voltage (+25V in this embodiment).

[0035] In this embodiment, the main control circuit is electrically connected to a voltage detection circuit, which includes a first voltage detection module for detecting the voltage at the output end of the generator, a second voltage detection module for detecting the voltage at the output end of the solar panel, a third voltage detection module for detecting the voltage at the output end of the charger, and a fourth voltage detection module for detecting the starting voltage.

[0036] By detecting multiple voltages, it is ensured that each circuit can work stably to prevent the voltage from being too high or too low, resulting in charging failure.

[0037] In this embodiment, the main control circuit is electrically connected to a current detection circuit, which includes a first current detection module for detecting the current at the output end of the generator, a second current detection module for detecting the current at the output end of the solar panel, a third current detection module for detecting the current of the temperature sensor, a fourth current detection module for detecting the current at the output end of the charger, and a comparator U3;

[0038] The positive and negative electrodes of the comparator U3 are electrically connected to one end of the main control circuit respectively, the first current detection module, the second current detection module, the third current detection module and the fourth current detection module are all electrically connected to the positive electrode of the comparator U3, and the output end of the comparator U3 is electrically connected to the buck-boost circuit.

[0039] Each current is detected and all currents are combined to monitor the total current to prevent the current from exceeding the standard and causing spontaneous combustion.

[0040] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0041] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0042] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A DC buck-boost charger, characterized in that: It includes a power supply circuit, a buck-boost circuit and a main control circuit; the power supply circuit includes a generator power supply and a solar panel power supply, the generator power supply includes MOS13, MOS14, transistor Q6 and transistor Q10, and the solar power supply includes MOS17, transistor Q7 and transistor Q11; The drain of MOS13 is electrically connected to the output end of the generator, the source of MOS13 is electrically connected to the source of MOS14, the gates of MOS13 and MOS14 are both electrically connected to the cathode of diode D34, the anode of diode D34 is electrically connected to the collector of transistor Q10, the emitter of transistor Q10 is electrically connected to the power supply, the base of transistor Q10 is electrically connected to the collector of transistor Q6, the emitter of transistor Q6 is grounded, and the base of transistor Q6 is electrically connected to the main control circuit; The drain of MOS17 is electrically connected to the output end of the solar panel, the gate of MOS17 is electrically connected to the collector of transistor Q11, the emitter of transistor Q11 is electrically connected to the power supply, the base of transistor Q11 is electrically connected to the collector of transistor Q7, the emitter of transistor Q7 is grounded, and the collector of transistor Q7 is electrically connected to the main control circuit; The drain of MOS14 and the source of MOS17 are both electrically connected to the power supply end of the buck-boost circuit, and the output end of the buck-boost circuit is electrically connected to the output end of the charger.

2. The DC buck-boost charger according to claim 1, characterized in that: The charger output terminal is also electrically connected to an overcharge protection circuit.

3. The DC buck-boost charger according to claim 1, characterized in that: The buck-boost circuit includes a buck-boost chip U1, and the buck-boost chip U1 is SC8701QDER.

4. The DC buck-boost charger according to claim 1, characterized in that: The charger output terminal is electrically connected to the power supply terminal of the main control circuit through a power supply circuit.

5. The DC buck-boost charger according to claim 1, characterized in that: The main control circuit is electrically connected to a voltage detection circuit, which includes a first voltage detection module for detecting the voltage at the output end of the generator, a second voltage detection module for detecting the voltage at the output end of the solar panel, a third voltage detection module for detecting the voltage at the output end of the charger, and a fourth voltage detection module for detecting the starting voltage.

6. The DC buck-boost charger according to claim 1, characterized in that: The main control circuit is electrically connected to a current detection circuit, which includes a first current detection module for detecting the current at the output end of the generator, a second current detection module for detecting the current at the output end of the solar panel, a third current detection module for detecting the current of the temperature sensor, a fourth current detection module for detecting the current at the output end of the charger, and a comparator U3; The positive pole and negative pole of the comparator U3 are electrically connected to one end of the main control circuit respectively, the first current detection module, the second current detection module, the third current detection module and the fourth current detection module are all electrically connected to the positive pole of the comparator U3, and the output end of the comparator U3 is electrically connected to the buck-boost circuit.

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