CN110957779A - Lithium battery charging circuit and service robot - Google Patents
Lithium battery charging circuit and service robot Download PDFInfo
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- CN110957779A CN110957779A CN201911186618.0A CN201911186618A CN110957779A CN 110957779 A CN110957779 A CN 110957779A CN 201911186618 A CN201911186618 A CN 201911186618A CN 110957779 A CN110957779 A CN 110957779A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
Abstract
The invention relates to a lithium battery charging circuit and a service robot, wherein the charging circuit comprises: boost constant current circuit, charge selection circuit and the control unit, wherein: the control unit is used for controlling the charging selection circuit to select to switch on an external power supply for charging before the voltage of the lithium battery during charging reaches a preset voltage, and controlling the charging selection circuit to select to switch on the boosting constant-current circuit for charging after the voltage of the lithium battery during charging reaches the preset voltage; the boosting constant-current circuit is used for boosting the external power supply and then providing boosted charging voltage for the lithium battery to keep constant-current charging. According to the lithium battery charging circuit and the service robot, the control unit controls to select to switch on the external power supply for charging or to charge after boosting through the boosting constant-current circuit according to whether the voltage during the charging of the lithium battery reaches the preset voltage, so that the charging speed of the lithium battery can be increased.
Description
Technical Field
The invention relates to the field of charging, in particular to a lithium battery charging circuit and a service robot.
Background
Nowadays, more and more service robots enter the fields of household, medical treatment, logistics, finance and the like. The lithium battery has the characteristics of high specific energy, long cycle life, wide working temperature range and the like, and is often used by a service robot. The maximum output voltage of the charger used by the service robot is generally equal to the overcharge voltage of the lithium battery. Therefore, in the process that the voltage charging of the lithium battery is closer to the maximum voltage of the charger, the charging current is smaller and smaller, and the charging time is greatly increased.
Disclosure of Invention
Based on this, it is necessary to provide a lithium battery charging circuit and a service robot for solving the problems that the charging current is smaller and the charging time is greatly increased in the process that the voltage of the lithium battery is closer to the maximum voltage of the charger.
A lithium battery charging circuit comprising: boost constant current circuit, charge selection circuit and the control unit, wherein: the control unit is used for controlling the charging selection circuit to select to switch on an external power supply for charging before the voltage of the lithium battery during charging reaches a preset voltage, and controlling the charging selection circuit to select to switch on the boosting constant-current circuit for charging after the voltage of the lithium battery during charging reaches the preset voltage; the boosting constant-current circuit is used for boosting the external power supply and then providing boosted charging voltage for the lithium battery to keep constant-current charging.
In one embodiment, the boost constant current circuit comprises an external power input terminal, an inductor L3, a field effect transistor Q2, a diode D6, a resistor R5, a boost positive output terminal, a boost negative output terminal and a chip U7, wherein: the external power input is connected to the boost positive output via the inductor L3 and a diode D6; the drain of the field effect transistor Q2 is connected to the connection node of the inductor L3 and the diode D6, the source of the field effect transistor Q2 is connected to the ground, and the gate of the field effect transistor Q2 is connected to the chip U7; the resistor R5 is connected between the boosting positive output end and the boosting negative output end; the boosting positive output end and the boosting negative output end are connected to the chip U7, and the chip U7 controls the field effect transistor Q2 to be switched on or switched off according to the signal of the boosting positive output end and the signal of the boosting negative output end.
In one embodiment, the charge selection circuit comprises a switch K1 and a switch Q6, the switch K1 connects the external power input, the boost positive output and the boost negative output, and the control unit is connected via the switch Q6; the control unit controls the charging selection circuit to select to switch on the external power supply for charging or the boosting constant-current circuit for charging by controlling the switch K1 and the switch tube Q6.
In one embodiment, the charge selection circuit comprises a switch K2 and a switch tube Q7, the switch K2 connects the switch K1 and the lithium battery, and the control unit is connected via the switch tube Q7; when an abnormal condition occurs in the charging process, the control unit controls the connection disconnection between the boosting constant current circuit and the lithium battery or controls the connection disconnection between the external power supply and the lithium battery by controlling the switch K2 and the switch tube Q7, and the lithium battery is stopped being charged.
In one embodiment, the lithium battery charging circuit further comprises a voltage sampling circuit, the voltage sampling circuit is connected with the lithium battery and the control unit and used for collecting the voltage of the lithium battery and feeding the voltage of the lithium battery back to the control unit, and the control unit judges whether a preset voltage is reached, whether charging is completed or whether voltage abnormality exists in the charging process according to the voltage of the lithium battery.
In one embodiment, the lithium battery charging circuit further comprises a current sampling circuit, the current sampling circuit is connected with the lithium battery and the control unit and used for collecting the current of the lithium battery and feeding the current of the lithium battery back to the control unit, and the control unit judges whether charging is completed or whether current abnormality exists in the charging process according to the current of the lithium battery.
In one embodiment, the lithium battery charging circuit further includes a contact block detection circuit, and the contact block detection circuit is connected to the control unit, and is configured to detect whether the lithium battery is connected to the lithium battery charging circuit, and start charging after the lithium battery is connected to the lithium battery charging circuit.
In one embodiment, the lithium battery charging circuit further comprises a temperature sampling circuit, wherein the temperature sampling circuit is connected with the control unit and used for collecting the temperature of a circuit board of the lithium battery charging circuit, and when the temperature is higher than a first temperature limit value, the fan is started to reduce the temperature or the temperature is higher than a second temperature limit value, and the charging is stopped.
In one embodiment, the lithium battery charging circuit further comprises a fan circuit, and the fan circuit is connected with the control unit and used for ventilating and cooling the circuit board.
In one embodiment, the lithium battery charging circuit further comprises an indicator light circuit, and the indicator light circuit is connected with the control unit and used for indicating the current charging state and alarming for charging abnormity.
In one embodiment, the lithium battery charging circuit further comprises a buzzer circuit, and the buzzer circuit is connected with the control unit and used for alarming when charging is abnormal.
In one embodiment, the lithium battery charging circuit further comprises a power supply circuit, and the power supply circuit is used for converting the voltage of the external power supply and then providing power for the control unit, the charging selection circuit, the contact block detection circuit, the temperature sampling circuit, the fan circuit, the indicator light circuit and the buzzer circuit.
A service robot comprising a lithium battery charging circuit as described above.
According to the lithium battery charging circuit and the service robot, whether the voltage reaches the preset voltage or not is controlled by the control unit according to the voltage when the lithium battery is charged, whether the external power supply is switched on for charging or the lithium battery is charged after being boosted by the boosting constant-current circuit is controlled, and the charging speed of the lithium battery can be increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings of the embodiments can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a lithium battery charging circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a boosting constant current circuit in a lithium battery charging circuit provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of a charging selection circuit in a lithium battery charging circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a voltage sampling circuit in a lithium battery charging circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a current sampling circuit in a lithium battery charging circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a contact block detection circuit in a lithium battery charging circuit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a temperature sampling circuit in a lithium battery charging circuit according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a fan circuit in a lithium battery charging circuit according to an embodiment of the present invention;
fig. 9 is a schematic diagram of an indicator light circuit in a lithium battery charging circuit according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a buzzer circuit in a lithium battery charging circuit according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a power supply circuit in a lithium battery charging circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1, which is a schematic diagram of a lithium battery charging circuit provided in an embodiment of the present invention, the lithium battery charging circuit 100 may specifically include: a boost constant current circuit 101, a charge selection circuit 102, and a control unit 103, wherein: the control unit 103 is configured to control the charging selection circuit 102 to selectively turn on the external power supply 300 for charging before the voltage of the lithium battery 200 during charging reaches a preset voltage, and control the charging selection circuit 102 to selectively turn on the boosting constant current circuit 101 for charging after the voltage of the lithium battery 200 during charging reaches the preset voltage; the boost constant current circuit 101 is used to boost the external power supply 300 and then provide the boosted charging voltage for the lithium battery 200, thereby maintaining the constant current charging.
According to the lithium battery charging circuit provided by the embodiment of the invention, the control unit controls to select to switch on the external power supply for charging or to charge after boosting through the boosting constant-current circuit according to whether the voltage during the charging of the lithium battery reaches the preset voltage, so that the charging speed of the lithium battery can be increased.
In one embodiment, the predetermined voltage may be 75% of the overcharge voltage of the lithium battery.
In one embodiment, the control unit 103 may specifically include a single chip.
In one embodiment, as shown in fig. 2, which is a schematic diagram of a boost constant current circuit in a lithium battery charging circuit provided in an embodiment of the present invention, the boost constant current circuit 101 may specifically include an external power input terminal (capable of receiving a 29.4V power), an inductor L3, a field effect transistor Q2, a diode D6, a resistor R5, a boost positive output terminal 35V +, a boost negative output terminal 35V-, and a chip U7, where: the external power input terminal 29.4V is connected to the boost positive output terminal 35V + via an inductor L3 and a diode D6; the drain of the field effect transistor Q2 is connected to the connection node of the inductor L3 and the diode D6, the source of the field effect transistor Q2 is connected to the ground, the gate of the field effect transistor Q2 is connected to the chip U7 (the enhancement driving circuit composed of Q3 and Q5 can be connected to the chip U7, and the enhancement driving circuits Q3 and Q5 amplify the waveforms of positive and negative half cycles respectively); the resistor R5 is connected between the boosting positive output end 35V + and the boosting negative output end 35V-; the boosting positive output end 35V + (can be connected to a pin 16 of the chip U7 through a resistor R39), the boosting negative output end 35V-is connected to a pin 1 of the chip U7, and the chip U7 outputs a PWM signal through automatically adjusting the duty ratio of PWM with fixed frequency according to the signal of the boosting positive output end 35V + and the signal of the boosting negative output end 35V-, so that the field effect transistor Q2 is controlled to be switched on or switched off.
The boosting principle analysis of the boosting constant current circuit 101: when the fet Q2 is turned on, the electric energy input from the external power input terminal 29.4V is stored in the inductor L3, and when the fet Q2 is turned off, the inductor L3 generates an induced voltage, and the voltage of the inductor L3 plus the voltage of 29.4V will make the output voltage higher than the input voltage 29.4V. Namely: 29.4V forms a BOOST circuit (a BOOST chopper circuit, namely a process of converting direct current into another voltage) through an inductor L3, a field effect transistor Q2, GND, a diode D6, a BOOST positive output end 35V +, a BOOST negative output end 35V and a resistor R5. During charging, the field effect transistor Q2 is switched on, input voltage flows through the inductor L3 and the field effect transistor Q2, current on the inductor L3 is linearly increased, certain energy is stored, in the process, the diode D6 is reversely biased to be cut off, and the boost positive output end 35V + and the boost negative output end 35V-end are unchanged; when discharging, the field effect transistor Q2 is cut off, which is equivalent to disconnection, because the inductor L3 has the function of reverse electromotive force, the current of the inductor L3 cannot suddenly change instantaneously, but slowly discharges, and is added to the boost positive output end 35V + and the boost negative output end 35V-end through the diode D6, so that the voltage is increased, and the boost is realized.
The constant current principle analysis of the boosting constant current circuit 101 is as follows: the charging current flows through the resistor R21, the resistor R22 and the resistor R23, the pin 16 of the chip U7 detects the voltage of the boosting positive output end 35V +, and the pin 1 of the chip U7 detects the voltage output by the boosting negative output end 35V-. When the charging voltage is higher than the set value, the chip U7 reduces the duty ratio of the PWM signal to reduce the charging current; when the charging voltage is smaller than the set value, the chip U7 increases the duty ratio of the PWM signal to make the charging current larger. Namely: the chip U7 outputs a reference voltage (14 pin) by itself, and the reference voltage is taken as a reference to be compared with the voltage divided by the boosting positive output end 35V + and the boosting negative output end 35V-by an error amplifier, and the PWM output by the 9 pin and the 10 pin is changed in real time according to the comparison result, so that a constant current is obtained.
In one embodiment, as shown in fig. 3, which is a schematic diagram of a charging selection circuit in a lithium battery charging circuit provided in the embodiment of the present invention, the charging selection circuit 102 may specifically include a switch K1 (which may be a RELAY) and a switch Q6, the switch K1 is connected to the external power input terminal 29.4V, the boost positive output terminal 35V + and the boost negative output terminal 35V —, and is connected to the RELAY1 pin of the control unit 103 via the switch Q6; the control unit 103 controls the charging selection circuit 102 to select whether to turn on the external power supply 300 for charging or to turn on the boosting constant current circuit 101 for charging by controlling the switch K1 and the switching tube Q6.
In one embodiment, as shown in fig. 3, the charge selection circuit may further include a switch K2 and a switch Q7, the switch K2 connects the CHG + pin and the CHG-pin of the switch K1, and the lithium battery BAT +, BAT —, and is connected to the RELAY2 pin of the control unit 103 via the switch Q7. When an abnormal condition occurs in the charging process, the control unit 103 controls the connection disconnection between the boosting constant current circuit 101 and the lithium battery or controls the connection disconnection between the external power supply and the lithium battery by controlling the switch K2 and the switching tube Q7, and stops charging the lithium battery.
In one embodiment, the lithium battery charging circuit further includes a VOLTAGE sampling circuit 104, as shown in fig. 4, which is a schematic diagram of the VOLTAGE sampling circuit in the lithium battery charging circuit provided in the embodiment of the present invention, the VOLTAGE sampling circuit 104 is connected to the lithium battery 200 and the control unit 103, and is configured to collect the VOLTAGE of the lithium battery 200 and feed back the VOLTAGE of the lithium battery 200 to a VOLTAGE pin of the control unit 103, and the control unit 103 determines whether a preset VOLTAGE is reached, whether charging is completed, or whether a VOLTAGE abnormality exists in the charging process according to the VOLTAGE of the lithium battery 200.
The voltage sampling circuit 104 may specifically include a resistor R31, a resistor R34, a resistor R32, a resistor R36, and a chip U3. BAT + of lithium battery 200 is connected to the non-inverting input terminal of chip U3 through resistor R31, BAT-of lithium battery 200 is connected to the inverting input terminal of chip U3 through resistor R34, resistor R32 is connected between the non-inverting input terminal + of chip U3 and ground, and resistor R36 is connected between the inverting input terminal-and the output terminal of chip U3. The output terminal of the chip U3 may also be connected to the VOLTAGE pin of the control unit 103 through a first-order filter circuit composed of a resistor R37 and a capacitor C20.
In one embodiment, the lithium battery charging circuit further includes a CURRENT sampling circuit 105, as shown in fig. 5, which is a schematic diagram of a CURRENT sampling circuit in the lithium battery charging circuit provided in the embodiment of the present invention, the CURRENT sampling circuit 105 is connected to the lithium battery 200 and the control unit 103, and is configured to collect a CURRENT of the lithium battery 200 and feed the CURRENT of the lithium battery 200 back to the CURRENT pin of the control unit 103, and the control unit 103 determines whether charging is completed or whether a CURRENT abnormality exists in the charging process according to the CURRENT of the lithium battery 200.
The current sampling circuit 105 may specifically include a resistor R10, a resistor R11, a resistor R8, a resistor R9, a capacitor C14, a capacitor C27, and a chip U1. The resistor R10 and the resistor R11 are connected between a pin 1 and a pin 8 of the chip U1 in parallel, and the pin 8 of the chip U1 is connected with a lithium battery BAT +; one end of the capacitor C14 is connected with the pin 1 and the pin 2 of the chip U1, and the other end of the capacitor C14 is connected with the pin 4 of the chip U1 and is grounded; one end of the resistor R8 is connected with the pin 5 of the chip U1, and the other end of the resistor R8 is connected with the CURRENT pin of the control unit 103; the resistor R9 and the capacitor C27 are connected in parallel between the CURRENT pin of the control unit 103 and the 4 pins of the chip U1.
In one embodiment, the lithium battery charging circuit further includes a contact block detection circuit 106, as shown in fig. 6, which is a schematic diagram of the contact block detection circuit in the lithium battery charging circuit provided in the embodiment of the present invention, and the contact block detection circuit 106 is connected to the control unit 103, and is configured to detect and determine whether the lithium battery 200 is connected to the lithium battery charging circuit, and start charging after the connection.
The contact block detection circuit 106 may specifically include a connector J5, a connector J6, a resistor R7, a resistor R35, a capacitor C10, and a capacitor C11. The plug connector J5 and the plug connector J6 are connected with an external photoelectric switch, the plug connector J5 is connected with a TRIG2 pin of the control unit 103 through a resistor R35 and a capacitor C11, and the plug connector J6 is connected with a TRIG1 pin of the control unit 103 through a resistor R7 and a capacitor C10.
In one embodiment, the lithium battery charging circuit further includes a temperature sampling circuit 107, as shown in fig. 7, which is a schematic diagram of the temperature sampling circuit in the lithium battery charging circuit provided in the embodiment of the present invention, the temperature sampling circuit is connected to the control unit 103 and is configured to collect a temperature of a circuit board of the lithium battery charging circuit, and when the temperature is too high, for example, higher than a first temperature limit value, the fan is turned on to reduce the temperature or the temperature is higher than a second temperature limit value, the charging is stopped. The first temperature limit and the second temperature limit can be preset in the control unit 103 according to actual conditions.
The temperature sampling circuit 107 may specifically include a resistor R25, a resistor R17, and a capacitor C6. The resistor R17 is connected in parallel with the capacitor C6, one end of the resistor R17 is grounded, and the other end of the resistor R25 is connected with the TEMP pin of the control unit 103; the other end of the resistor R25 is 5V.
In one embodiment, the lithium battery charging circuit further includes a fan circuit 108, as shown in fig. 8, which is a schematic diagram of the fan circuit in the lithium battery charging circuit provided in the embodiment of the present invention, and the fan circuit is connected to the control unit 103 for ventilating and cooling the circuit board.
The fan circuit 108 may specifically include a plug J3, a diode D3, a switching tube Q1, a resistor R12, and a resistor R13. The plug connector J3 is connected to an external FAN, the diode D3 is connected with the plug connector J3 in parallel, the drain electrode of the switch tube Q1 is connected to the pin 1 of the plug connector J3, the source electrode of the switch tube Q1 is connected to the ground, the grid electrode of the switch tube Q1 is grounded through the R12, and the switch tube Q1 is connected to the pin FAN-CTRL of the control unit 103 through the R13.
In one embodiment, the lithium battery charging circuit further includes an indicator light circuit 109, as shown in fig. 9, which is a schematic diagram of an indicator light circuit in the lithium battery charging circuit provided in the embodiment of the present invention, and the indicator light circuit 109 is connected to the control unit 103 and is used for indicating a current charging state and a charging abnormality alarm.
The indicator circuit 109 may specifically include an indicator LD2, an indicator LD3, an indicator LD4, a resistor R14, a resistor R15, and a resistor R16. The anodes of the indicator lights LD2, LD3 and LD4 are connected to 5V, and the cathodes are connected to the LED1, LED2 and LED3 of the control unit 103 through the resistors R14, R15 and R16, respectively. LD2 shows a red color and is always on when the charging circuit is powered. LD3 shows red, and when charging is started, it shows bright; when the charging is stopped, the display is not carried out; when fully charged, LD3 is not displayed, but is displayed by LD 4; when abnormal conditions exist, the alarm information such as overcurrent protection is prompted through the number of flashing times. LD4 shows green, when fully charged, it shows bright; when not fully charged, it is not shown.
In one embodiment, the lithium battery charging circuit further includes a buzzer circuit 110, as shown in fig. 10, which is a schematic diagram of a buzzer circuit in the lithium battery charging circuit provided in the embodiment of the present invention, and the buzzer circuit 110 is connected to the control unit 103 and is used for alarming during abnormal charging.
The buzzer circuit 110 may specifically include a buzzer B1, a diode D5, and a switching tube Q4. The buzzer B1 is connected in parallel with the diode D5, the cathode of the diode D5 is connected to 5V, the anode is connected to the collector of the switch tube Q4, the emitter of the switch tube Q4 is grounded, and the base is connected to the BEEP pin of the control unit 103.
In one embodiment, the lithium battery charging circuit further includes a power supply circuit 111, as shown in fig. 11, which is a schematic diagram of the power supply circuit in the lithium battery charging circuit provided in the embodiment of the present invention, and the power supply circuit 111 is configured to convert a voltage of 29.4V of an external power supply into 5V or ± 12V of power supply provided by the control unit 103, the charging selection circuit 102, the contact block detection circuit 106, the temperature sampling circuit 107, the fan circuit 108, the indicator light circuit 109, and the buzzer circuit 110.
The embodiment of the invention also provides a service robot, which particularly comprises the lithium battery charging circuit.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (13)
1. A lithium battery charging circuit, comprising: boost constant current circuit, charge selection circuit and the control unit, wherein: the control unit is used for controlling the charging selection circuit to select to switch on an external power supply for charging before the voltage of the lithium battery during charging reaches a preset voltage, and controlling the charging selection circuit to select to switch on the boosting constant-current circuit for charging after the voltage of the lithium battery during charging reaches the preset voltage; the boosting constant-current circuit is used for boosting the external power supply and then providing boosted charging voltage for the lithium battery to keep constant-current charging.
2. The lithium battery charging circuit of claim 1, wherein the boost constant current circuit comprises an external power input terminal, an inductor L3, a field effect transistor Q2, a diode D6, a resistor R5, a boost positive output terminal, a boost negative output terminal, and a chip U7, wherein: the external power input is connected to the boost positive output via the inductor L3 and a diode D6; the drain of the field effect transistor Q2 is connected to the connection node of the inductor L3 and the diode D6, the source of the field effect transistor Q2 is connected to the ground, and the gate of the field effect transistor Q2 is connected to the chip U7; the resistor R5 is connected between the boosting positive output end and the boosting negative output end; the boosting positive output end and the boosting negative output end are connected to the chip U7, and the chip U7 controls the field effect transistor Q2 to be switched on or switched off according to the signal of the boosting positive output end and the signal of the boosting negative output end.
3. The lithium battery charging circuit according to claim 2, wherein the charging selection circuit comprises a switch K1 and a switch Q6, the switch K1 connects the external power supply input terminal, the boosting positive output terminal and the boosting negative output terminal, and connects the control unit via the switch Q6; the control unit controls the charging selection circuit to select to switch on the external power supply for charging or the boosting constant-current circuit for charging by controlling the switch K1 and the switch tube Q6.
4. The lithium battery charging circuit according to claim 3, wherein the charging selection circuit comprises a switch K2 and a switch tube Q7, the switch K2 connects the switch K1 and the lithium battery, and the control unit is connected via the switch tube Q7; when an abnormal condition occurs in the charging process, the control unit controls the connection disconnection between the boosting constant current circuit and the lithium battery or controls the connection disconnection between the external power supply and the lithium battery by controlling the switch K2 and the switch tube Q7, and the lithium battery is stopped being charged.
5. The lithium battery charging circuit according to any one of claims 1 to 4, further comprising a voltage sampling circuit, wherein the voltage sampling circuit is connected to the lithium battery and the control unit, and is configured to collect the voltage of the lithium battery and feed the voltage of the lithium battery back to the control unit, and the control unit determines whether a preset voltage is reached, whether charging is completed, or whether a voltage abnormality exists during charging according to the voltage of the lithium battery.
6. The lithium battery charging circuit according to claim 5, further comprising a current sampling circuit, wherein the current sampling circuit is connected to the lithium battery and the control unit, and is configured to collect a current of the lithium battery and feed the current of the lithium battery back to the control unit, and the control unit determines whether charging is completed or whether current abnormality exists in the charging process according to the current of the lithium battery.
7. The lithium battery charging circuit of claim 6, further comprising a contact block detection circuit, wherein the contact block detection circuit is connected to the control unit, and is configured to detect whether the lithium battery is connected to the lithium battery charging circuit and start charging after the lithium battery is connected to the lithium battery charging circuit.
8. The lithium battery charging circuit of claim 7, further comprising a temperature sampling circuit connected to the control unit for collecting a temperature of a circuit board of the lithium battery charging circuit, and when the temperature is higher than a first temperature limit, the fan is turned on to lower the temperature or the temperature is higher than a second temperature limit, the charging is stopped.
9. The lithium battery charging circuit of claim 8, further comprising a fan circuit connected to the control unit for ventilating and cooling the circuit board.
10. The lithium battery charging circuit according to claim 9, further comprising an indicator light circuit connected to the control unit for indicating a current charging status and an abnormal charging alarm.
11. The lithium battery charging circuit of claim 10, further comprising a buzzer circuit connected to the control unit for alarming during charging anomalies.
12. The lithium battery charging circuit according to claim 11, further comprising a power supply circuit, wherein the power supply circuit is configured to convert the voltage of the external power source and supply power to the control unit, the charging selection circuit, the contact block detection circuit, the temperature sampling circuit, the fan circuit, the indicator light circuit, and the buzzer circuit.
13. A service robot comprising the lithium battery charging circuit according to any one of claims 1 to 12.
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| CN109638924A (en) * | 2019-01-21 | 2019-04-16 | 安徽天健环保车辆部件有限公司 | A kind of electric automobile lithium battery equalized maintenance system and its working method |
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| CN108649652A (en) * | 2018-06-08 | 2018-10-12 | 厦门芯源电子科技有限公司 | Massager automatic lifting presses charging circuit |
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