CN110854979A - Lithium battery electric energy transmission connector - Google Patents
Lithium battery electric energy transmission connector Download PDFInfo
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- CN110854979A CN110854979A CN201911186064.4A CN201911186064A CN110854979A CN 110854979 A CN110854979 A CN 110854979A CN 201911186064 A CN201911186064 A CN 201911186064A CN 110854979 A CN110854979 A CN 110854979A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
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Abstract
The invention relates to a lithium battery electric energy transmission connector which comprises a control unit, an input interface, a PWM logic unit and an electric energy transmission unit, wherein the input interface is connected with the control unit; the electric energy transmission unit comprises a switching tube Q1, a sampling resistor R1, a switching tube Q2, a switching tube Q3, a buffer U1, a comparator U2, a comparator U3, an inductor L1, a sampling resistor R2, a resistor R3 and an adjustable resistor R4; the sampling resistor R2 is connected with an output interface, and the output interface is connected with a lithium battery; the control unit receives sampling resistance R1 sampling signal, receives sampling resistance R2's feedback signal, output control signal give PWM logic unit, PWM logic unit exports two way PWM signals respectively and gives switch tube Q2 and switch tube Q3 and carries out on-off control, the link at switch tube Q2 and Q3 is connected to inductance L1's one end, and resistance R3 is connected to the other end, output interface is connected to resistance R3's the other end. The invention can stably control the electric energy transmission of the connector according to the detected temperature information.
Description
Technical Field
The invention relates to the technical field of connectors, in particular to a lithium battery electric energy transmission connector.
Background
In the prior art, there are many technical schemes for transmitting electric energy to a battery or a load through a connector or a connection circuit, but particularly how to coordinate the balance between a charging voltage and a temperature and how to accurately control the stability of electric energy output when the charging voltage and the temperature are balanced is a difficult problem of the current connector, and particularly when the electric energy transmission needs to be performed quickly, how to accurately control the voltage or the current when large current or high power transmission is ensured, and avoid an overhigh temperature, which is a difficult problem of safely performing the electric energy transmission.
Content of application
The application provides a lithium battery electric energy transmission connector which can accurately control electric energy transmission and avoid overhigh temperature of the transmission connector; the device comprises a control unit, an input interface, a PWM logic unit and an electric energy transmission unit; the control unit is connected with the PWM logic unit, and the electric energy transmission unit comprises a switching tube Q1, a sampling resistor R1, a switching tube Q2, a switching tube Q3, a buffer U1, a comparator U2, a comparator U3, an inductor L1, a sampling resistor R2, a resistor R3 and an adjustable resistor R4; the sampling resistor R2 is connected with an output interface, and the output interface is connected with a lithium battery; the control unit receives sampling resistance R1 sampling signal, receives sampling resistance R2's feedback signal, output control signal give PWM logic unit, PWM logic unit exports two way PWM signals respectively and gives switch tube Q2 and switch tube Q3 and carries out on-off control, the link at switch tube Q2 and Q3 is connected to inductance L1's one end, and resistance R3 is connected to the other end, output interface is connected to resistance R3's the other end.
In the lithium battery electric energy transmission connector, the first output end of the PWM logic unit is connected to the buffer U1, the output end of the buffer U1 is connected to the positive input end of the comparator U2, the negative output end of the comparator U2 is connected to the connection end between the resistor R3 and the adjustable resistor R4, and the output end of the comparator U2 is connected to the controllable end of the controllable switch Q2; the second output end of the PWM logic unit is connected with the positive input end of a comparator U3, the negative input end of a comparator U3 is grounded, and the output end of a comparator U3 is connected with the controllable end of a controllable switch Q3; the positive terminals of the comparator U2 and the comparator U3 are both connected to one non-controllable terminal of the controllable switch Q2, and the negative terminal of the comparator U2 is connected to the other non-controllable terminal of the controllable switch Q2 through a capacitor C1; the negative terminal of comparator U3 is connected to ground.
Lithium cell power transmission connector, the control unit can control power transmission unit's output voltage value specifically includes: the control unit receives the sampling signal of the sampling resistor R1, compares the sampling signal with an input reference signal and outputs a first detection signal, receives the feedback signal of the sampling resistor R2, compares the feedback signal with a feedback reference signal and inputs a second detection signal, connects the first detection signal and the second detection signal through an OR circuit and outputs the signals to an error comparison amplifier, and outputs an adjusting signal to the PWM logic unit for PWM adjustment after the signals are compared and judged by the error comparison amplifier.
The sampling signal is a current sampling signal, the current sampling signal is compared with a current reference signal and then output to a first input end of an or gate, the input interface is compared with a standard voltage signal and then output to a second input end of the or gate, the or gate outputs to a controllable end of a mode selection switch, one end of a non-controllable end of the mode selection switch is grounded, the other end of the non-controllable end of the mode selection switch is connected and output to a comparator U3, and when the input voltage exceeds a preset voltage threshold value or the input current is larger than a preset current, the comparator U3 is connected to a pull-up resistor, so that the comparator U3 is connected to the pull-up voltage through the pull-up resistor.
In the lithium battery electric energy transmission connector, the first output end of the PWM logic unit is connected to the buffer U1, the output end of the buffer U1 is connected to the positive input end of the comparator U2, the negative output end of the comparator U2 is connected to the connection end between the resistor R3 and the adjustable resistor R4, and the output end of the comparator U2 is connected to the controllable end of the controllable switch Q2; the second output end of the PWM logic unit is connected with the positive input end of a comparator U3, the negative input end of a comparator U3 is grounded, and the output end of a comparator U3 is connected with the controllable end of a controllable switch Q3; the positive pole end of the comparator U3 is connected with one non-controllable end of the controllable switch Q2, and the negative pole of the comparator U2 is connected with the other non-controllable end of the controllable switch Q2 through the capacitor C1; the negative pole of the comparator U3 is grounded; the positive terminal of the comparator U2 is connected with a first voltage converter, and the first voltage converter is connected with the pull-up voltage.
The lithium battery power transmission connector, the control unit includes: a comparator U4, a comparator U5, an OR gate U6, a comparator U7, a comparator U8, a comparator U9, a comparator U10, a comparator U11, a comparator U2, diodes D2-D3, controllable switches Q4, Q5 and Q6; the positive input end of the comparator U4 is connected with an input interface, the negative input end of the comparator U4 is connected with standard comparison voltage, and the output end of the comparator U4 is connected with the controllable end of the controllable switch Q4; the positive input end of the comparator U4 is further connected with the positive input end of the comparator U12, the negative input end of the comparator U12 is connected with 0.7V voltage, the output end of the comparator U12 is connected with the first input end of the OR gate U6, the output end of the OR gate is connected with the controllable end of the controllable switch Q4, the second input end of the OR gate U6 is connected with the output end of the comparator U5, the positive input end of the comparator U5 is connected with the output end of the comparator U7, and the negative input end of the comparator U12 is connected with a 250mA current source; the positive input end and the negative input end of the comparator U7 are respectively connected with two ends of a sampling resistor R1, the output end of the comparator U7 is also connected with the positive input end of the comparator U8, the negative input end of the comparator U8 is connected with an input reference signal, and the output end of the comparator U8 is connected with the anode of a diode D2; the positive input end and the negative input end of the comparator U9 are respectively connected with two input ends of a sampling resistor R2, the positive input end and the negative input end are both connected with a 3.5mA current source, the 3.5mA current source is grounded through the controllable switch Q6, and the controllable end of the controllable switch Q6 is controlled through a charging start signal; the output end of the comparator U9 is connected with the positive input end of the comparator U10, the negative input end of the comparator U10 is connected with a feedback reference signal, the output end is connected with the anode of the diode D3, the cathode of the diode D3 is connected with the cathode of the diode D2, and both are connected with a 20uA current source and one end of a resistor R5 and R6, the other end of the resistor R5 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the other end of a resistor R6, then connecting one end of a resistor R7 and one end of a capacitor C3, connecting the other end of the resistor R7 with one end of a capacitor C4, connecting the other end of the capacitor C4 with the other end of a capacitor C3, connecting one end of a resistor R7 with the negative input end of the comparator U11, connecting the other end of the capacitor C3 with the output end of the comparator U11, the positive input end of the comparator is connected with a 20uA current source, and the output end of the comparator U11 is also connected with the PWM logic circuit.
In the electric energy transmission connector of the lithium battery, the pull-up voltage is connected with one non-controllable end of a controllable switch Q5 through the pull-up resistor, the other non-controllable end of the controllable switch Q5 is connected with one non-controllable end of the controllable switch Q4, and the other non-controllable end of the controllable switch Q4 is grounded; the controllable end of the controllable switch Q5 receives a comparison signal of the output end of the comparator U12, controls the pull-up voltage to enable, and is conducted after the controllable switch Q5 receives the enable signal, so that the pull-up voltage is connected to a non-controllable end of the controllable switch Q4 through the pull-up resistor; the comparator U5 compares the input current signal and the comparator U4 compares the input voltage signal and outputs a control signal to the controllable switch Q4 through the OR gate U6.
The lithium battery electric energy transmission connector receives an external charging start trigger signal according to the charging start signal and is further connected with a temperature detection circuit, the priority of the temperature detection circuit is higher than that of the charging start trigger signal, and when the temperature detection circuit outputs a signal, the charging start trigger signal is interrupted.
The lithium battery power transmission connector comprises a thermistor R9, a resistor R8, a resistor R10, a resistor R11, a resistor R12, a comparator U13, a comparator U14, a comparator U15, an OR gate U16 and an NOR gate U17, wherein a negative input end of the comparator U15 is connected with a positive input end of the comparator U13 and a negative input end of the comparator U14, a positive input end of the comparator U15 is connected with a 100mV reference voltage, a negative input end of the comparator U13 and a positive input end of the comparator U14 are connected with two ends of the resistor R11, output ends of the comparator U13 and the comparator U14 are respectively connected with two input ends of the NOR gate U17, output ends of the NOR gate U17 and output ends of the comparator U15 are respectively connected with two output ends of the OR gate U16, and an output end of the OR gate U16 is connected with a controllable end of the controllable switch Q6.
In the electric energy transmission connector for the lithium battery, the controllable switch Q1-Q6 comprises a triode and an MOS (metal oxide semiconductor) transistor, and the controllable end is a base electrode of the triode or a grid electrode of the MOS transistor.
In order to solve the technical problems: the invention can stably control the electric energy transmission of the connector according to the detected temperature information. The connector can accurately control electric energy transmission according to the signal of the input end and the signal of the output end, meets the requirement of electric energy transmission, stably transmits the electric energy to the lithium battery, can detect the temperature of the connector through the temperature detection unit, avoids overhigh temperature of the connector, sets the priority between the temperature and the starting signal, and avoids overhigh temperature of the connector. The main improvement point of the invention is that a plurality of comparison circuits are arranged in the control unit to carry out accurate sampling judgment, and can control the stability of signal transmission according to sampling signals and control the access of pull-up voltage according to the comparison input of current and voltage; the invention has another main improvement point that a temperature detection circuit is arranged, the charging priority control is carried out by detecting the temperature of the connector, the over-high temperature of the connector is avoided, the temperature information is accurately identified by the cooperation of a thermistor and a comparator, and the electric energy transmission control of the connector in a safe temperature range can be ensured.
Drawings
Fig. 1 is a schematic diagram of a connector according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a connector according to a second embodiment of the present invention.
FIG. 3 is a schematic diagram of a control unit according to the present invention.
FIG. 4 is a schematic diagram of a temperature detecting unit according to the present invention.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
The first embodiment is as follows:
as shown in fig. 1, the invention relates to a lithium battery power transmission connector, which comprises a control unit, an input interface, a PWM logic unit, and a power transmission unit; the control unit is connected with the PWM logic unit, and the electric energy transmission unit comprises a switching tube Q1, a sampling resistor R1, a switching tube Q2, a switching tube Q3, a buffer U1, a comparator U2, a comparator U3, an inductor L1, a sampling resistor R2, a resistor R3 and an adjustable resistor R4; the sampling resistor R2 is connected with an output interface, and the output interface is connected with a lithium battery; the control unit receives sampling resistance R1 sampling signal, receives sampling resistance R2's feedback signal, output control signal give PWM logic unit, PWM logic unit exports two way PWM signals respectively and gives switch tube Q2 and switch tube Q3 and carries out on-off control, the link at switch tube Q2 and Q3 is connected to inductance L1's one end, and resistance R3 is connected to the other end, output interface is connected to resistance R3's the other end.
In the lithium battery electric energy transmission connector, the first output end of the PWM logic unit is connected to the buffer U1, the output end of the buffer U1 is connected to the positive input end of the comparator U2, the negative output end of the comparator U2 is connected to the connection end between the resistor R3 and the adjustable resistor R4, and the output end of the comparator U2 is connected to the controllable end of the controllable switch Q2; the second output end of the PWM logic unit is connected with the positive input end of a comparator U3, the negative input end of a comparator U3 is grounded, and the output end of a comparator U3 is connected with the controllable end of a controllable switch Q3; the positive terminals of the comparator U2 and the comparator U3 are both connected to one non-controllable terminal of the controllable switch Q2, and the negative terminal of the comparator U2 is connected to the other non-controllable terminal of the controllable switch Q2 through a capacitor C1; the negative terminal of comparator U3 is connected to ground.
Preferably, the adjustable resistor R4 can be adjusted to adjust the reference voltage, and the on-time of the switch Q2 can be controlled according to the adjustment of the reference voltage. Through the PWM logic unit, the switching tubes Q2 and Q3 can be coordinated to be alternately conducted, and the control signal of the switching tube Q2 can be more stable due to the arrangement of the buffer U1.
Lithium cell power transmission connector, the control unit can control power transmission unit's output voltage value specifically includes: the control unit receives the sampling signal of the sampling resistor R1, compares the sampling signal with an input reference signal and outputs a first detection signal, receives the feedback signal of the sampling resistor R2, compares the feedback signal with a feedback reference signal and inputs a second detection signal, connects the first detection signal and the second detection signal through an OR circuit and outputs the signals to an error comparison amplifier, and outputs an adjusting signal to the PWM logic unit for PWM adjustment after the signals are compared and judged by the error comparison amplifier.
The sampling signal is a current sampling signal, the current sampling signal is compared with a current reference signal and then output to a first input end of an or gate, the input interface is compared with a standard voltage signal and then output to a second input end of the or gate, the or gate outputs to a controllable end of a mode selection switch, one end of a non-controllable end of the mode selection switch is grounded, the other end of the non-controllable end of the mode selection switch is connected and output to a comparator U3, and when the input voltage exceeds a preset voltage threshold value or the input current is larger than a preset current, the comparator U3 is connected to a pull-up resistor, so that the comparator U3 is connected to the pull-up voltage through the pull-up resistor.
As shown in fig. 3, is a control unit of the present invention, including: a comparator U4, a comparator U5, an OR gate U6, a comparator U7, a comparator U8, a comparator U9, a comparator U10, a comparator U11, a comparator U2, diodes D2-D3, controllable switches Q4, Q5 and Q6; the positive input end of the comparator U4 is connected with an input interface, the negative input end of the comparator U4 is connected with standard comparison voltage, and the output end of the comparator U4 is connected with the controllable end of the controllable switch Q4; the positive input end of the comparator U4 is further connected with the positive input end of the comparator U12, the negative input end of the comparator U12 is connected with 0.7V voltage, the output end of the comparator U12 is connected with the first input end of the OR gate U6, the output end of the OR gate is connected with the controllable end of the controllable switch Q4, the second input end of the OR gate U6 is connected with the output end of the comparator U5, the positive input end of the comparator U5 is connected with the output end of the comparator U7, and the negative input end of the comparator U12 is connected with a 250mA current source; the positive input end and the negative input end of the comparator U7 are respectively connected with two ends of a sampling resistor R1, the output end of the comparator U7 is also connected with the positive input end of the comparator U8, the negative input end of the comparator U8 is connected with an input reference signal, and the output end of the comparator U8 is connected with the anode of a diode D2; the positive input end and the negative input end of the comparator U9 are respectively connected with two input ends of a sampling resistor R2, the positive input end and the negative input end are both connected with a 3.5mA current source, the 3.5mA current source is grounded through the controllable switch Q6, and the controllable end of the controllable switch Q6 is controlled through a charging start signal; the output end of the comparator U9 is connected with the positive input end of the comparator U10, the negative input end of the comparator U10 is connected with a feedback reference signal, the output end is connected with the anode of the diode D3, the cathode of the diode D3 is connected with the cathode of the diode D2, and both are connected with a 20uA current source and one end of a resistor R5 and R6, the other end of the resistor R5 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the other end of a resistor R6, then connecting one end of a resistor R7 and one end of a capacitor C3, connecting the other end of the resistor R7 with one end of a capacitor C4, connecting the other end of the capacitor C4 with the other end of a capacitor C3, connecting one end of a resistor R7 with the negative input end of the comparator U11, connecting the other end of the capacitor C3 with the output end of the comparator U11, the positive input end of the comparator is connected with a 20uA current source, and the output end of the comparator U11 is also connected with the PWM logic circuit.
R1 and R2 in fig. 1 and 3 are the same component.
In the electric energy transmission connector of the lithium battery, the pull-up voltage is connected with one non-controllable end of a controllable switch Q5 through the pull-up resistor, the other non-controllable end of the controllable switch Q5 is connected with one non-controllable end of the controllable switch Q4, and the other non-controllable end of the controllable switch Q4 is grounded; the controllable end of the controllable switch Q5 receives a comparison signal of the output end of the comparator U12, controls the pull-up voltage to enable, and is conducted after the controllable switch Q5 receives the enable signal, so that the pull-up voltage is connected to a non-controllable end of the controllable switch Q4 through the pull-up resistor; the comparator U5 compares the input current signal and the comparator U4 compares the input voltage signal and outputs a control signal to the controllable switch Q4 through the OR gate U6.
The lithium battery electric energy transmission connector receives an external charging start trigger signal according to the charging start signal and is further connected with a temperature detection circuit, the priority of the temperature detection circuit is higher than that of the charging start trigger signal, and when the temperature detection circuit outputs a signal, the charging start trigger signal is interrupted.
As shown in fig. 4, the temperature detection circuit of the present invention includes a thermistor R9, a resistor R8, a resistor R10, a resistor R11, a resistor R12, a comparator U13, a comparator U14, a comparator U15, an or gate U16, and a nor gate U17, wherein a negative input terminal of the comparator U15 is connected to a positive input terminal of the comparator U13 and a negative input terminal of the comparator U14, a positive input terminal of the comparator U15 is connected to a reference voltage of 100mV, negative input terminals of the comparator U13 and the comparator U14 are connected to two ends of a resistor R11, output terminals of the comparator U13 and the comparator U14 are respectively connected to two input terminals of a nor gate U17, output terminals of the nor gate U17 and output terminals of the comparator U15 are respectively connected to two output terminals of the or gate U16, and an output terminal of the or gate U16 is connected to a controllable terminal Q6.
Preferably, a thermistor R9 is provided in the transmission line of the connector or in the connector port to sense temperature information.
In the electric energy transmission connector for the lithium battery, the controllable switch Q1-Q6 comprises a triode and an MOS (metal oxide semiconductor) transistor, and the controllable end is a base electrode of the triode or a grid electrode of the MOS transistor.
Example two:
as shown in fig. 2, the invention relates to a lithium battery power transmission connector, which comprises a control unit, an input interface, a PWM logic unit, and a power transmission unit; the control unit is connected with the PWM logic unit, and the electric energy transmission unit comprises a switching tube Q1, a sampling resistor R1, a switching tube Q2, a switching tube Q3, a buffer U1, a comparator U2, a comparator U3, an inductor L1, a sampling resistor R2, a resistor R3 and an adjustable resistor R4; the sampling resistor R2 is connected with an output interface, and the output interface is connected with a lithium battery; the control unit receives sampling resistance R1 sampling signal, receives sampling resistance R2's feedback signal, output control signal give PWM logic unit, PWM logic unit exports two way PWM signals respectively and gives switch tube Q2 and switch tube Q3 and carries out on-off control, the link at switch tube Q2 and Q3 is connected to inductance L1's one end, and resistance R3 is connected to the other end, output interface is connected to resistance R3's the other end.
Preferably, the adjustable resistor R4 can be adjusted to adjust the reference voltage, and the on-time of the switch Q2 can be controlled according to the adjustment of the reference voltage. Through the PWM logic unit, the switching tubes Q2 and Q3 can be coordinated to be alternately conducted, and the control signal of the switching tube Q2 can be more stable due to the arrangement of the buffer U1.
Lithium cell power transmission connector, the control unit can control power transmission unit's output voltage value specifically includes: the control unit receives the sampling signal of the sampling resistor R1, compares the sampling signal with an input reference signal and outputs a first detection signal, receives the feedback signal of the sampling resistor R2, compares the feedback signal with a feedback reference signal and inputs a second detection signal, connects the first detection signal and the second detection signal through an OR circuit and outputs the signals to an error comparison amplifier, and outputs an adjusting signal to the PWM logic unit for PWM adjustment after the signals are compared and judged by the error comparison amplifier.
The sampling signal is a current sampling signal, the current sampling signal is compared with a current reference signal and then output to a first input end of an or gate, the input interface is compared with a standard voltage signal and then output to a second input end of the or gate, the or gate outputs to a controllable end of a mode selection switch, one end of a non-controllable end of the mode selection switch is grounded, the other end of the non-controllable end of the mode selection switch is connected and output to a comparator U3, and when the input voltage exceeds a preset voltage threshold value or the input current is larger than a preset current, the comparator U3 is connected to a pull-up resistor, so that the comparator U3 is connected to the pull-up voltage through the pull-up resistor.
In the lithium battery electric energy transmission connector, the first output end of the PWM logic unit is connected to the buffer U1, the output end of the buffer U1 is connected to the positive input end of the comparator U2, the negative output end of the comparator U2 is connected to the connection end between the resistor R3 and the adjustable resistor R4, and the output end of the comparator U2 is connected to the controllable end of the controllable switch Q2; the second output end of the PWM logic unit is connected with the positive input end of a comparator U3, the negative input end of a comparator U3 is grounded, and the output end of a comparator U3 is connected with the controllable end of a controllable switch Q3; the positive pole end of the comparator U3 is connected with one non-controllable end of the controllable switch Q2, and the negative pole of the comparator U2 is connected with the other non-controllable end of the controllable switch Q2 through the capacitor C1; the negative pole of the comparator U3 is grounded; the positive terminal of the comparator U2 is connected with a first voltage converter, and the first voltage converter is connected with the pull-up voltage.
The pull-up voltage in fig. 2 and 3 is the same voltage, and preferably, by connecting the pull-up voltage, the power supply voltage of the comparator U3 can be controlled, and the bias proportion value of the comparator U3 can be adjusted. R1 and R2 in fig. 2 and 3 are the same component.
As shown in fig. 3, a schematic diagram of the control unit of the present invention. The lithium battery power transmission connector, the control unit includes: a comparator U4, a comparator U5, an OR gate U6, a comparator U7, a comparator U8, a comparator U9, a comparator U10, a comparator U11, a comparator U2, diodes D2-D3, controllable switches Q4, Q5 and Q6; the positive input end of the comparator U4 is connected with an input interface, the negative input end of the comparator U4 is connected with standard comparison voltage, and the output end of the comparator U4 is connected with the controllable end of the controllable switch Q4; the positive input end of the comparator U4 is further connected with the positive input end of the comparator U12, the negative input end of the comparator U12 is connected with 0.7V voltage, the output end of the comparator U12 is connected with the first input end of the OR gate U6, the output end of the OR gate is connected with the controllable end of the controllable switch Q4, the second input end of the OR gate U6 is connected with the output end of the comparator U5, the positive input end of the comparator U5 is connected with the output end of the comparator U7, and the negative input end of the comparator U12 is connected with a 250mA current source; the positive input end and the negative input end of the comparator U7 are respectively connected with two ends of a sampling resistor R1, the output end of the comparator U7 is also connected with the positive input end of the comparator U8, the negative input end of the comparator U8 is connected with an input reference signal, and the output end of the comparator U8 is connected with the anode of a diode D2; the positive input end and the negative input end of the comparator U9 are respectively connected with two input ends of a sampling resistor R2, the positive input end and the negative input end are both connected with a 3.5mA current source, the 3.5mA current source is grounded through the controllable switch Q6, and the controllable end of the controllable switch Q6 is controlled through a charging start signal; the output end of the comparator U9 is connected with the positive input end of the comparator U10, the negative input end of the comparator U10 is connected with a feedback reference signal, the output end is connected with the anode of the diode D3, the cathode of the diode D3 is connected with the cathode of the diode D2, and both are connected with a 20uA current source and one end of a resistor R5 and R6, the other end of the resistor R5 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the other end of a resistor R6, then connecting one end of a resistor R7 and one end of a capacitor C3, connecting the other end of the resistor R7 with one end of a capacitor C4, connecting the other end of the capacitor C4 with the other end of a capacitor C3, connecting one end of a resistor R7 with the negative input end of the comparator U11, connecting the other end of the capacitor C3 with the output end of the comparator U11, the positive input end of the comparator is connected with a 20uA current source, and the output end of the comparator U11 is also connected with the PWM logic circuit.
In the electric energy transmission connector of the lithium battery, the pull-up voltage is connected with one non-controllable end of a controllable switch Q5 through the pull-up resistor, the other non-controllable end of the controllable switch Q5 is connected with one non-controllable end of the controllable switch Q4, and the other non-controllable end of the controllable switch Q4 is grounded; the controllable end of the controllable switch Q5 receives a comparison signal of the output end of the comparator U12, controls the pull-up voltage to enable, and is conducted after the controllable switch Q5 receives the enable signal, so that the pull-up voltage is connected to a non-controllable end of the controllable switch Q4 through the pull-up resistor; the comparator U5 compares the input current signal and the comparator U4 compares the input voltage signal and outputs a control signal to the controllable switch Q4 through the OR gate U6.
The lithium battery electric energy transmission connector receives an external charging start trigger signal according to the charging start signal and is further connected with a temperature detection circuit, the priority of the temperature detection circuit is higher than that of the charging start trigger signal, and when the temperature detection circuit outputs a signal, the charging start trigger signal is interrupted.
Fig. 4 is a schematic diagram of the temperature detecting unit according to the present invention.
The lithium battery power transmission connector comprises a thermistor R9, a resistor R8, a resistor R10, a resistor R11, a resistor R12, a comparator U13, a comparator U14, a comparator U15, an OR gate U16 and an NOR gate U17, wherein a negative input end of the comparator U15 is connected with a positive input end of the comparator U13 and a negative input end of the comparator U14, a positive input end of the comparator U15 is connected with a 100mV reference voltage, a negative input end of the comparator U13 and a positive input end of the comparator U14 are connected with two ends of the resistor R11, output ends of the comparator U13 and the comparator U14 are respectively connected with two input ends of the NOR gate U17, output ends of the NOR gate U17 and output ends of the comparator U15 are respectively connected with two output ends of the OR gate U16, and an output end of the OR gate U16 is connected with a controllable end of the controllable switch Q6.
Preferably, a thermistor R9 is provided in the transmission line of the connector or in the connector port to sense temperature information.
Preferably, when the voltage or current is higher than the threshold value, the switch Q4 is turned on, and the pull-up voltage is grounded, so that the pull-up voltage cannot provide enough supporting power for the comparator U3, and the comparator U3 is not enough to support the output control switch tube Q3, so that no power transmission is performed. Preferably, the reference voltage and the reference current are adjustable.
In the electric energy transmission connector for the lithium battery, the controllable switch Q1-Q6 comprises a triode and an MOS (metal oxide semiconductor) transistor, and the controllable end is a base electrode of the triode or a grid electrode of the MOS transistor.
The invention can stably control the electric energy transmission of the connector according to the detected temperature information. The connector can accurately control electric energy transmission according to the signal of the input end and the signal of the output end, meets the requirement of electric energy transmission, stably transmits the electric energy to the lithium battery, can detect the temperature of the connector through the temperature detection unit, avoids overhigh temperature of the connector, sets the priority between the temperature and the starting signal, and avoids overhigh temperature of the connector. The main improvement point of the invention is that a plurality of comparison circuits are arranged in the control unit to carry out accurate sampling judgment, and can control the stability of signal transmission according to sampling signals and control the access of pull-up voltage according to the comparison input of current and voltage; the invention has another main improvement point that a temperature detection circuit is arranged, the charging priority control is carried out by detecting the temperature of the connector, the over-high temperature of the connector is avoided, the temperature information is accurately identified by the cooperation of a thermistor and a comparator, and the electric energy transmission control of the connector in a safe temperature range can be ensured.
Claims (10)
1. A lithium battery electric energy transmission connector is characterized by comprising a control unit, an input interface, a PWM logic unit and an electric energy transmission unit; the control unit is connected with the PWM logic unit, and the electric energy transmission unit comprises a switching tube Q1, a sampling resistor R1, a switching tube Q2, a switching tube Q3, a buffer U1, a comparator U2, a comparator U3, an inductor L1, a sampling resistor R2, a resistor R3 and an adjustable resistor R4; the sampling resistor R2 is connected with an output interface, and the output interface is connected with a lithium battery; the control unit receives sampling resistance R1 sampling signal, receives sampling resistance R2's feedback signal, output control signal give PWM logic unit, PWM logic unit exports two way PWM signals respectively and gives switch tube Q2 and switch tube Q3 and carries out on-off control, the link at switch tube Q2 and Q3 is connected to inductance L1's one end, and resistance R3 is connected to the other end, output interface is connected to resistance R3's the other end.
2. The power transmission connector for the lithium battery as claimed in claim 1, wherein the first output terminal of the PWM logic unit is connected to the buffer U1, the output terminal of the buffer U1 is connected to the positive input terminal of the comparator U2, the negative output terminal of the comparator U2 is connected to the connection terminal between the resistor R3 and the adjustable resistor R4, and the output terminal of the comparator U2 is connected to the controllable terminal of the controllable switch Q2; the second output end of the PWM logic unit is connected with the positive input end of a comparator U3, the negative input end of a comparator U3 is grounded, and the output end of a comparator U3 is connected with the controllable end of a controllable switch Q3; the positive terminals of the comparator U2 and the comparator U3 are both connected to one non-controllable terminal of the controllable switch Q2, and the negative terminal of the comparator U2 is connected to the other non-controllable terminal of the controllable switch Q2 through a capacitor C1; the negative terminal of comparator U3 is connected to ground.
3. The lithium battery power transmission connector of claim 1, wherein the control unit is capable of controlling the output voltage value of the power transmission unit, and specifically comprises: the control unit receives the sampling signal of the sampling resistor R1, compares the sampling signal with an input reference signal and outputs a first detection signal, receives the feedback signal of the sampling resistor R2, compares the feedback signal with a feedback reference signal and inputs a second detection signal, connects the first detection signal and the second detection signal through an OR circuit and outputs the signals to an error comparison amplifier, and outputs an adjusting signal to the PWM logic unit for PWM adjustment after the signals are compared and judged by the error comparison amplifier.
4. The lithium battery power transmission connector of claim 3, wherein the sampling signal is a current sampling signal, the current sampling signal is compared with a current reference signal and then output to a first input terminal of an or gate, the input interface is compared with a standard voltage signal and then output to a second input terminal of the or gate, the or gate outputs to a controllable terminal of a mode selection switch, one terminal of a non-controllable terminal of the mode selection switch is grounded, the other terminal of the non-controllable terminal is connected and output to the comparator U3, and when the input voltage exceeds a preset voltage threshold or the input current is greater than a preset current, the comparator U3 is connected to a pull-up resistor, so that the comparator U3 is connected to the pull-up voltage through the pull-up resistor.
5. The power transmission connector for the lithium battery as claimed in claim 4, wherein the first output terminal of the PWM logic unit is connected to the buffer U1, the output terminal of the buffer U1 is connected to the positive input terminal of the comparator U2, the negative output terminal of the comparator U2 is connected to the connection terminal between the resistor R3 and the adjustable resistor R4, and the output terminal of the comparator U2 is connected to the controllable terminal of the controllable switch Q2; the second output end of the PWM logic unit is connected with the positive input end of a comparator U3, the negative input end of a comparator U3 is grounded, and the output end of a comparator U3 is connected with the controllable end of a controllable switch Q3; the positive pole end of the comparator U3 is connected with one non-controllable end of the controllable switch Q2, and the negative pole of the comparator U2 is connected with the other non-controllable end of the controllable switch Q2 through the capacitor C1; the negative pole of the comparator U3 is grounded; the positive terminal of the comparator U2 is connected with a first voltage converter, and the first voltage converter is connected with the pull-up voltage.
6. A lithium battery power transmission connector as claimed in claim 2 or 3, characterized in that the control unit comprises: a comparator U4, a comparator U5, an OR gate U6, a comparator U7, a comparator U8, a comparator U9, a comparator U10, a comparator U11, a comparator U2, diodes D2-D3, controllable switches Q4, Q5 and Q6; the positive input end of the comparator U4 is connected with an input interface, the negative input end of the comparator U4 is connected with standard comparison voltage, and the output end of the comparator U4 is connected with the controllable end of the controllable switch Q4; the positive input end of the comparator U4 is further connected with the positive input end of the comparator U12, the negative input end of the comparator U12 is connected with 0.7V voltage, the output end of the comparator U12 is connected with the first input end of the OR gate U6, the output end of the OR gate is connected with the controllable end of the controllable switch Q4, the second input end of the OR gate U6 is connected with the output end of the comparator U5, the positive input end of the comparator U5 is connected with the output end of the comparator U7, and the negative input end of the comparator U12 is connected with a 250mA current source; the positive input end and the negative input end of the comparator U7 are respectively connected with two ends of a sampling resistor R1, the output end of the comparator U7 is also connected with the positive input end of the comparator U8, the negative input end of the comparator U8 is connected with an input reference signal, and the output end of the comparator U8 is connected with the anode of a diode D2; the positive input end and the negative input end of the comparator U9 are respectively connected with two input ends of a sampling resistor R2, the positive input end and the negative input end are both connected with a 3.5mA current source, the 3.5mA current source is grounded through the controllable switch Q6, and the controllable end of the controllable switch Q6 is controlled through a charging start signal; the output end of the comparator U9 is connected with the positive input end of the comparator U10, the negative input end of the comparator U10 is connected with a feedback reference signal, the output end is connected with the anode of the diode D3, the cathode of the diode D3 is connected with the cathode of the diode D2, and both are connected with a 20uA current source and one end of a resistor R5 and R6, the other end of the resistor R5 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the other end of a resistor R6, then connecting one end of a resistor R7 and one end of a capacitor C3, connecting the other end of the resistor R7 with one end of a capacitor C4, connecting the other end of the capacitor C4 with the other end of a capacitor C3, connecting one end of a resistor R7 with the negative input end of the comparator U11, connecting the other end of the capacitor C3 with the output end of the comparator U11, the positive input end of the comparator is connected with a 20uA current source, and the output end of the comparator U11 is also connected with the PWM logic circuit.
7. The connector for electric energy transmission of lithium batteries according to claim 6, wherein the pull-up voltage is connected to a non-controllable terminal of a controllable switch Q5 through the pull-up resistor, another non-controllable terminal of the controllable switch Q5 is connected to a non-controllable terminal of the controllable switch Q4, and another non-controllable terminal of the controllable switch Q4 is grounded; the controllable end of the controllable switch Q5 receives a comparison signal of the output end of the comparator U12, controls the pull-up voltage to enable, and is conducted after the controllable switch Q5 receives the enable signal, so that the pull-up voltage is connected to a non-controllable end of the controllable switch Q4 through the pull-up resistor; the comparator U5 compares the input current signal and the comparator U4 compares the input voltage signal and outputs a control signal to the controllable switch Q4 through the OR gate U6.
8. The lithium battery power transmission connector of claim 6, wherein the charge start signal receives an external charge start trigger signal, and is further connected to a temperature detection circuit, the temperature detection circuit has a higher priority than the charge start trigger signal, and the charge start trigger signal is interrupted when the temperature detection circuit outputs a signal.
9. The lithium battery power transmission connector of claim 9, wherein the thermistor R9, the resistor R8, the resistor R10, the resistor R11, the resistor R12, the comparator U13, the comparator U14, the comparator U15, the OR gate U16, and the NOR gate U17, the negative input terminal of the comparator U15 is connected to the positive input terminal of the comparator U13 and the negative input terminal of the comparator U14, the positive input end of the comparator U15 is connected with a reference voltage of 100mV, the negative input end of the comparator U13 and the positive input end of the comparator U14 are connected with two ends of a resistor R11, the output ends of the comparator U13 and the comparator U14 are respectively connected with two input ends of a NOR gate U17, the output end of the nor gate U17 and the output end of the comparator U15 are respectively connected to two output ends of the or gate U16, and the output end of the or gate U16 is connected to the controllable end of the controllable switch Q6.
10. The lithium battery power transmission connector of claim 9, wherein the controllable switches Q1-Q6 comprise a triode and a MOS transistor, and the controllable terminal is a base of the triode or a gate of the MOS transistor.
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