CN115765096A - Patrol robot wireless charging port protection circuit and patrol robot - Google Patents
Patrol robot wireless charging port protection circuit and patrol robot Download PDFInfo
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- CN115765096A CN115765096A CN202211502083.5A CN202211502083A CN115765096A CN 115765096 A CN115765096 A CN 115765096A CN 202211502083 A CN202211502083 A CN 202211502083A CN 115765096 A CN115765096 A CN 115765096A
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Abstract
The invention provides a patrol robot wireless charging port protection circuit which is composed of a surge suppression module, a main switch module, a charging control chip and an output voltage monitoring module; the surge suppression module is connected between the positive pole of the wireless charging power supply and the input end of the main switch control module in series to receive the charging current from the positive pole of the wireless charging power supply and remove the surge current in the charging current, so that the damage of surge impact on circuit components is reduced, and the protection of a wireless charging port is realized; the charging control chip controls the main switch module to switch on or off a charging loop between the wireless charging power supply and the battery according to the real-time voltage or the charging current of the battery, so that the charging process of the battery is stably and reliably guaranteed, and the charging safety of the battery is improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a patrol robot wireless charging port protection circuit and a patrol robot.
Background
The existing wireless charging technology does not need the mutual contact of charging electrodes, has the waterproof characteristic and is particularly suitable for patrol robots operated in outdoor environments. The situations of overshoot voltage spike, current spike and the like inevitably occur in the wireless charging process, and the wireless charging port needs to be protected.
In the prior art, a current control chip is adopted, and a protection circuit is built by integrating overvoltage protection, undervoltage protection, overcurrent protection and power supply transient protection. Fig. 1 is a conventional wireless charging port protection circuit. In fig. 1, the protection circuit sets overvoltage and undervoltage protection points by changing resistors R1, R2, and R3, realizes power supply transient protection by a transient suppression diode D2, sets output voltage at the Vout terminal by changing resistors R8 and R9, and realizes an overcurrent protection function by using a resistor R5. The working principle is as follows: when undervoltage, overcurrent, short circuit and overvoltage occur, the current control chip outputs low level through a control pin 13 GATE, the field effect tube Q1 is closed, and a charging power supply path is cut off; when the fault phenomenon disappears, the field effect transistor Q1 is restarted. However, the wireless charging port protection circuit has large switching loss under the condition of large-current charging, and the field effect transistor Q1 generates heat seriously and is easy to damage; the transient suppression diode D2 is easy to damage under the impact of surge exceeding 400W peak value because large surge current cannot be absorbed; there is no reverse current protection, and after charging, the output end current VOUT can flow into the input end VCC in the reverse direction, resulting in the waste of the output end battery power.
Disclosure of Invention
The invention provides a patrol robot wireless charging port protection circuit and a patrol robot, and aims to solve the problems of large switching loss, strong surge impact and no reverse current protection of the conventional wireless charging port protection circuit.
The invention is realized in this way, a patrol robot wireless charging port protection circuit, including:
the device comprises a surge suppression module, a main switch module, a charging control chip and an output voltage monitoring module;
the input end of the surge suppression module is connected with the anode of a wireless charging power supply, and the output end of the surge suppression module is connected with the input end of the main switch control module and the power supply end of the charging control chip;
the controlled end of the main switch control module is connected with the control end of the charging control chip;
the first end of the output voltage monitoring module and the output voltage detection end of the charging control chip are respectively connected to a common joint between the output end of the main switch control module and the positive electrode of the battery;
the second end of the output voltage monitoring module is connected with the feedback input end of a voltage stabilizer of the charging control chip;
the surge suppression module is used for receiving a charging current from the positive pole of the wireless charging power supply and removing the surge current in the charging current;
the charging control chip is used for starting according to the charging current after the surge current is removed and generating a control signal of the main switch module according to the charging current or the real-time voltage of the battery;
the main switch module is used for switching on or switching off a charging loop between the wireless charging power supply and the battery according to the control signal and monitoring the charging current of the battery;
the output voltage monitoring module is used for setting the maximum value of the voltage of the battery before the charging loop is switched on and monitoring the real-time voltage of the battery after the charging loop is switched on.
Optionally, the surge suppression module comprises:
the transient suppression circuit comprises a transient suppression diode, a piezoresistor, a first inductor and a first capacitor;
the negative electrode of the transient suppression diode, the first end of the piezoresistor and the first end of the first inductor are connected to the positive electrode of the wireless charging power supply in a shared mode;
the anode of the transient suppression diode and the second end of the piezoresistor are grounded respectively;
a common joint point between the second end of the first inductor and the first end of the first capacitor is used as an output end of the surge suppression module;
the second end of the first capacitor is grounded.
Optionally, the main switch module comprises:
the sampling circuit comprises a first bipolar transistor, a second bipolar transistor, a third bipolar transistor, a fourth bipolar transistor and a sampling resistor;
the base electrode of the first bipolar transistor and the base electrode of the third bipolar transistor are connected to a first control end of the charging control chip in a sharing mode, and the collector electrodes of the first bipolar transistor and the third bipolar transistor are connected to the output end of the surge suppression module in a sharing mode;
the emitter of the first bipolar transistor and the emitter of the second bipolar transistor are connected to the common source input end of the charging control chip in a sharing mode; the emitter electrode of the third bipolar transistor is connected with the emitter electrode of the fourth bipolar transistor;
the base electrode of the second bipolar transistor and the base electrode of the fourth bipolar transistor are connected to the second control end of the charging control chip in common; a collector electrode of the second bipolar transistor, a collector electrode of the fourth bipolar transistor and a first end of the sampling resistor are connected to a current detection input end of the charging control chip in common;
and the second end of the sampling resistor and the output voltage detection end of the charging control chip are connected to the anode of the battery in common.
Optionally, the output voltage monitoring module includes:
a first voltage dividing resistor and a second voltage dividing resistor;
the first end of the first voltage-dividing resistor is connected with the output end of the main switch module;
a common joint between the second end of the first voltage-dividing resistor and the first end of the second voltage-dividing resistor is connected with a feedback input end of a voltage stabilizer of the charging control chip;
and the second end of the second voltage-dividing resistor is grounded.
Optionally, the circuit further comprises a charging current monitoring module;
the charging current monitoring module comprises a Hall sensor, a second capacitor and a first resistor;
the positive end of the Hall sensor is connected with the output end of the surge suppression module, and the negative end of the Hall sensor is connected with the input end of the main switch module and the power supply end of the charging control chip;
the output end of the Hall sensor is connected with the first end of the first resistor, and the power supply end is connected with power supply voltage;
a common joint between the second end of the first resistor and the first end of the second capacitor is connected with a current acquisition end of the controller;
and the second end of the second capacitor is grounded.
Optionally, the circuit further comprises a hardware overcurrent protection module;
the hardware overcurrent protection module comprises a comparator, a second resistor, a third resistor, a second capacitor, a fourth resistor, a fifth resistor and a sixth resistor;
the inverting input end of the comparator is connected with the output end of the charging current monitoring module;
the second end of the second resistor, the first end of the third resistor and the first end of the second capacitor are connected to the positive-phase input end of the comparator in common;
the output end of the comparator is connected with the first end of the fourth resistor;
a common joint between the second end of the fourth resistor, the first end of the fifth resistor and the first end of the sixth resistor is connected with the fault output end of the charging control chip;
the second end of the sixth resistor is connected with the shutdown control input end of the charging control chip;
and the first end of the second resistor and the second end of the fifth resistor are respectively connected with a power supply voltage.
Optionally, the circuit further comprises a charging under-voltage monitoring module;
the charging voltage under-voltage monitoring module comprises: a seventh resistor, an eighth resistor and a third capacitor;
the first end of the seventh resistor is connected with the positive electrode of the wireless charging power supply;
the second end of the seventh resistor, the first end of the eighth resistor and the first end of the third capacitor are connected to the input end of the under-voltage comparator of the charging control chip in common;
and a second end of the eighth resistor and a second end of the third capacitor are connected to the ground in common.
Optionally, the circuit further comprises a charging voltage overvoltage monitoring module;
the charging voltage overvoltage monitoring module comprises a ninth resistor, a tenth resistor and a fourth capacitor;
the first end of the ninth resistor is connected with the positive electrode of the wireless charging power supply;
the second end of the ninth resistor, the first end of the tenth resistor and the first end of the fourth capacitor are connected to the input end of an overvoltage comparator of the charging control chip in common;
a second end of the tenth resistor and a second end of the fourth capacitor are connected to ground in common.
Optionally, the circuit further comprises a power supply voltage conversion module;
the power supply voltage conversion module is used for converting the battery voltage into the power supply voltage of the component.
The invention also provides a patrol robot, which comprises the patrol robot wireless charging port protection circuit.
The patrol robot wireless charging port protection circuit provided by the invention is composed of a surge suppression module, a main switch module, a charging control chip and an output voltage monitoring module; the surge suppression module is connected between the positive pole of the wireless charging power supply and the input end of the main switch control module in series to receive the charging current from the positive pole of the wireless charging power supply and remove the surge current in the charging current, so that the surge impact is smoothed, the damage of the surge impact on circuit components is reduced, and the protection of a wireless charging port is realized; the charging control chip generates a control signal of the main switch module according to the charging voltage or the charging current of the battery, and the main switch module switches on or off a charging loop between the wireless charging power supply and the battery according to the control signal, so that the charging process of the battery is stably and reliably guaranteed, and the charging safety of the battery is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a conventional wireless charging port protection circuit;
fig. 2 is a schematic diagram of a protection circuit for a wireless charging port of a patrol robot according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a protection circuit for a wireless charging port of a patrol robot according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a power supply voltage conversion module according to an embodiment of the 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.
The patrol robot wireless charging port protection circuit provided by the invention is composed of a surge suppression module, a main switch module, a charging control chip and an output voltage monitoring module; the surge suppression module is connected between the positive pole of the wireless charging power supply and the input end of the main switch control module in series to receive the charging current from the positive pole of the wireless charging power supply and remove the surge current in the charging current, so that the surge impact is smoothed, the damage of the surge impact on circuit components is reduced, and the protection of a wireless charging port is realized; the charging control chip generates a control signal of the main switch module according to the real-time voltage or charging current of the battery, and the main switch module switches on or off a charging loop between the wireless charging power supply and the battery according to the control signal, so that the charging process of the battery is stably and reliably guaranteed, and the charging safety of the battery is improved.
Fig. 2 is a schematic diagram of a patrol robot wireless charging port protection circuit according to an embodiment of the present invention.
As shown in fig. 2, the patrol robot wireless charging port protection circuit includes:
the surge suppression module 10, the main switch module 20, the charging control chip 30 and the output voltage monitoring module 40;
the input end of the surge suppression module 10 is connected with the positive electrode CH + of the wireless charging power supply, and the output end is connected with the input end of the main switch control module 20 and the power supply end of the charging control chip 30;
the controlled end of the main switch control module 20 is connected with the control end of the charging control chip 30;
the first end of the output voltage monitoring module 40 and the output voltage detection end OUT of the charging control chip 30 are respectively connected to a common junction point between the output end of the main switch control module 20 and the positive electrode of the battery;
the second end of the output voltage monitoring module 40 is connected to the feedback input end FB of the voltage regulator of the charging control chip 30;
the surge suppression module 10 is configured to receive a charging current from a positive electrode CH + of a wireless charging power supply, and remove a surge current in the charging current;
the charging control chip 30 is used for starting according to the charging current after removing the surge current, and generating a control signal of the main switch module 20 according to the charging current or the real-time voltage of the battery;
the main switch module 20 is used for switching on or switching off a charging loop between the wireless charging power supply and the battery according to the control signal, and monitoring the charging current of the battery;
the output voltage monitoring module 40 is used to set the maximum value of the battery voltage before the charging loop is turned on, and to monitor the real-time voltage of the battery after the charging loop is turned on.
In the embodiment, when a wireless charging power supply is connected to the patrol robot wireless charging port protection circuit, a charging current firstly passes through the surge suppression module 10 and then is supplied to the battery through the main switch module 20 to charge the battery. The surge suppression module 10 can smooth surge impact and suppress surge power of 30kw, so that damage of the surge impact to circuit components is reduced.
In this embodiment, the output voltage monitoring module 40 sets the maximum value of the battery voltage before the charging loop is turned on, so as to prevent the charging voltage from exceeding the maximum value of the battery voltage and causing damage to the battery; the output voltage monitoring module 40 is further configured to monitor a real-time voltage of the battery after the charging circuit is turned on, and provide the real-time voltage to the charging control chip 30. Optionally, the charging control chip 30 is preferably an LT4256-3 chip.
The charging control chip 30 generates a control signal according to the real-time voltage of the battery monitored by the output voltage monitoring module 40 or the charging current of the battery monitored by the main switch module 20. The main switch module 20 is turned on or off according to a control signal provided by the charging control chip 30. When the real-time voltage of the battery is greater than the preset voltage threshold, the charging control chip 30 outputs a turn-off signal, so that the charging control chip 30 cuts off a path between the wireless charging power supply and the battery, thereby realizing overvoltage protection of the battery voltage and avoiding damage of the battery. Here, the preset voltage threshold is determined by parameters of the battery itself. When the charging current of the battery is larger than the preset current threshold, the charging control chip 30 outputs a turn-off signal, so that the charging control chip 30 cuts off a path between the wireless charging power supply and the battery, thereby realizing hardware overcurrent protection and preventing the battery from being damaged by overlarge charging current.
Optionally, as shown in fig. 3, a schematic diagram of a patrol robot wireless charging port protection circuit according to another embodiment of the present invention is provided. The surge suppression module 10 includes:
the transient suppression circuit comprises a transient suppression diode D11, a piezoresistor R11, a first inductor L1 and a first capacitor C1;
the cathode of the transient suppression diode D11, the first end of the piezoresistor R1 and the first end of the first inductor L1 are connected to the anode CH + of the wireless charging power supply in a sharing mode;
the anode of the transient suppression diode D11 and the second end of the piezoresistor R11 are respectively grounded;
a common junction point between the second end of the first inductor L1 and the first end of the first capacitor C1 is used as an output end of the surge suppression module 10;
the second end of the first capacitor C1 is grounded.
In this embodiment, since the transient suppression diode D11 and the varistor R11 have low resistance to ground, a low-impedance return path is provided for the surge current. When the surge current is input, the surge current flows back through a path of a wireless charging power supply positive electrode CH + → transient suppressor D11, and a voltage dependent resistor R11 → GND ground, and cannot flow through and damage subsequent circuits. The surge peak value can be determined according to the transient suppression diode D11, the voltage dependent resistor R11 and the first inductor L1. Optionally, when a varistor R11 with a current capacity of 30kw of transient suppression diodes D11, 4500A is selected, the surge suppression module 10 may absorb peak surges in excess of 30 kw.
In the surge suppression module 10, the first inductor L1 and the first capacitor C1 form an LC filter circuit, which is favorable for reducing fluctuation of voltage and current output by the positive electrode CH + of the wireless charging power supply.
Optionally, the main switch module 20 includes:
a first bipolar transistor Q1, a second bipolar transistor Q2, a third bipolar transistor Q3, a fourth bipolar transistor Q4 and a sampling resistor R21;
the base of the first bipolar transistor Q1 and the base of the third bipolar transistor Q3 are connected to the first control end HGATE of the charging control chip 30, and the collectors of the first bipolar transistor Q1 and the third bipolar transistor Q3 are connected to the output end of the surge suppression module 10;
the emitters of the first and second bipolar transistors Q1 and Q2 are connected to a common SOURCE input SOURCE of the charging control chip 30; the emitter of the third bipolar transistor Q3 is connected with the emitter of the fourth bipolar transistor Q4;
the base of the second bipolar transistor Q2 and the base of the fourth bipolar transistor Q4 are connected to the second control terminal DGATE of the charging control chip 30; a collector of the second bipolar transistor Q2, a collector of the fourth bipolar transistor Q4, and a first end of the sampling resistor R21 are commonly connected to a current detection input terminal SENSE of the charging control chip 30;
the second end of the sampling resistor R21 and the output voltage detection end OUT of the charging control chip 30 are commonly connected to the positive electrode of the battery.
In this embodiment, the charging control chip 30 controls the first bipolar transistor Q1 and the third bipolar transistor Q3 to be turned on or off, so as to turn on or off the charging loop between the wireless charging power supply and the battery. The second bipolar transistor Q2 and the fourth bipolar transistor Q4 are used for preventing battery current from reversely flowing into the positive electrode CH + of the wireless charging power supply under the condition of no charging, so that the energy loss of the battery is effectively avoided, the reverse current protection is realized, and the service efficiency of the battery is improved. Further, in this embodiment, the first bipolar transistor Q1 and the third bipolar transistor Q3, and the second bipolar transistor Q2 and the fourth bipolar transistor Q4 are arranged in parallel, so that the overcurrent capability of the charging circuit is increased, and the temperature rise of the bipolar transistors is greatly reduced.
Too high a temperature will affect the lifetime of the bipolar transistor. Through tests, when 50A charging current flows, the temperature of the first bipolar transistor Q1, the second bipolar transistor Q2, the third bipolar transistor Q3 and the fourth bipolar transistor Q4 is 88 ℃. The temperature is proper and margin is left, so that the wireless charging port protection circuit provided by the invention can be suitable for the wireless charging current of 0-50A, the usable current charging range of the wireless charging port protection circuit is effectively expanded, the switching loss is reduced, and the phenomenon that the field effect tube Q1 in the prior art is seriously heated and is easily damaged is avoided.
The sampling resistor R21 is used for monitoring the charging current of the battery for the charging control chip 30. The charging control chip 30 can obtain the charging current of the battery according to the voltage at the two ends of the sampling resistor R21. When the charging current of the battery is greater than the preset current threshold, the charging control chip 30 outputs a turn-off signal, such as a low level, through the first control terminal, so that the first bipolar transistor Q1 and the third bipolar transistor Q3 are turned on and turned off, the charging loop is cut off to stop charging, the hardware overcurrent protection is realized, and the battery is prevented from being damaged due to the excessive charging current.
Optionally, the output voltage monitoring module 40 includes:
a first voltage dividing resistor R41 and a second voltage dividing resistor R42;
a first end of the first voltage-dividing resistor R41 is connected to an output end of the main switch module 20;
a common junction point between the second end of the first voltage-dividing resistor R41 and the first end of the second voltage-dividing resistor R42 is connected to a feedback input terminal FB of the voltage regulator of the charging control chip 30;
the second terminal of the second voltage-dividing resistor R42 is grounded.
Before the charging circuit is switched on, the present embodiment divides the voltage by the first voltage dividing resistor R41 and the second voltage dividing resistor R42, and sets the maximum battery voltage value VBAT-max =1.25 ÷ R42 × (R41 + R42) to prevent the charging voltage from exceeding the maximum battery voltage value and causing damage to the battery. After the charging circuit is turned on, the output voltage monitoring module 40 is further configured to monitor a real-time voltage of the battery and provide the real-time voltage to the charging control chip 30. The charge control chip 30 compares the real-time voltage of the battery with the maximum voltage of the battery. When the real-time voltage of the battery is greater than the maximum voltage of the battery, the charging control chip 30 outputs a turn-off signal so that the charging control chip 30 cuts off a path between the wireless charging power supply and the battery, thereby realizing the overvoltage protection of the real-time voltage of the battery, preventing the voltage of the battery from exceeding the maximum voltage of the battery and avoiding the damage of the battery. Meanwhile, the controller may obtain the battery real-time voltage ADC3 through a node of the first voltage-dividing resistor R41 and the second voltage-dividing resistor R42.
Optionally, the circuit further comprises a charging current monitoring module 50;
the charging current monitoring module 50 comprises a hall sensor 51, a second capacitor C2 and a first resistor R1;
the positive end of the hall sensor 51 is connected with the output end of the surge suppression module 10, and the negative end is connected with the input end of the main switch module 20 and the power supply end of the charging control chip 30;
the output end of the Hall sensor 51 is connected with the first end of the first resistor R1;
a common joint between the second end of the first resistor R1 and the first end of the second capacitor C2 is connected with a current acquisition end of a controller;
the second end of the second capacitor C2 is grounded.
In this embodiment, a voltage signal proportional to a current is output from a current output from the positive electrode CH + of the wireless charging power supply after passing through the hall sensor 51, and the voltage signal passes through an RC filter circuit formed by the second capacitor C2 and the first resistor R1 to obtain a charging current signal ADC1, where on one hand, the charging current signal ADC1 is provided to a current collecting terminal of the controller to perform software protection on overvoltage and undervoltage of the charging current, and on the other hand, the charging current signal ADC1 is provided to the hardware overcurrent protection module 60 to implement hardware overcurrent protection on the charging current.
Optionally, the hardware overcurrent protection module 60 includes a comparator 61, a second resistor R2, a third resistor R3, a second capacitor C2, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6;
the inverting input end of the comparator 61 is connected with the output end of the charging current monitoring module 50;
the second end of the second resistor R2, the first end of the third resistor R3, and the first end of the second capacitor C2 are commonly connected to the non-inverting input terminal of the comparator 61;
the output end of the comparator 61 is connected with the first end of the fourth resistor R4;
a common junction point between the second end of the fourth resistor R4, the first end of the fifth resistor R5, and the first end of the sixth resistor R6 is connected to the fault output terminal FLT of the charging control chip 30;
a second end of the sixth resistor R6 is connected to a shutdown control input end SHDN of the charging control chip 30;
and a first end of the second resistor R2 and a second end of the fifth resistor R5 are respectively connected with a power supply voltage.
In this embodiment, the fifth resistor R5 is used to pull up the SHDN terminal of the charging control chip 30 to the power voltage, so that the default state of the charging control chip 30 is a power-on normal operation.
The charging current signal ADC1 output by the charging current monitoring module 50 is synchronously input to the inverting input terminal of the comparator 61, when the voltage of the inverting input terminal of the comparator 61 is greater than that of the forward input terminal, it indicates that an overcurrent event occurs, the comparator 61 outputs a low level to the charging control chip 30 through the shutdown control input terminal SHDN to stop the charging control chip 30, and the first bipolar transistor Q1 and the third bipolar transistor Q3 are turned from on to off, so as to cut off the charging loop to stop charging, thereby implementing hardware overcurrent protection. The second resistor R2 and the third resistor R3 set a voltage at the positive input terminal, that is, an overcurrent threshold corresponding to an overcurrent event, in a voltage dividing manner.
A common junction point between the second end of the fourth resistor R4, the first end of the fifth resistor R5, and the first end of the sixth resistor R6 constitutes a signal transmission node OFF _ CH between the controller and the charging control chip 30.
After the charging current signal ADC1 is provided to a current collection end of the controller, the controller monitors whether overcurrent occurs according to the charging current signal ADC1, if so, outputs a low level to the signal transmission node OFF _ CH, turns OFF the charging control chip 30, and turns on the first bipolar transistor Q1 and the third bipolar transistor Q3 to turn OFF the charging loop to stop charging, thereby implementing software overcurrent protection. Similarly, after the battery real-time voltage ADC3 is provided to the controller, the controller determines whether the battery real-time voltage is overvoltage according to the battery real-time voltage ADC3, if so, outputs a low level to the signal transmission node OFF _ CH, turns OFF the charging control chip 30, and turns on the first bipolar transistor Q1 and the third bipolar transistor Q3 to be OFF, so as to cut OFF the charging loop and stop charging.
Optionally, the patrol robot wireless charging port protection circuit further includes a charging under-voltage monitoring module 70, where the charging under-voltage monitoring module 70 includes: a seventh resistor R7, an eighth resistor R8 and a third capacitor C3;
the first end of the seventh resistor R7 is connected with the positive electrode CH + of the wireless charging power supply;
a second end of the seventh resistor R7, a first end of the eighth resistor R8, and a first end of the third capacitor C3 are commonly connected to the undervoltage comparison input end UV of the charging control chip 30;
a second end of the eighth resistor R8 and a second end of the third capacitor C3 are connected to ground in common.
In this embodiment, the seventh resistor R7 and the eighth resistor R8 divide the wireless charging power voltage to obtain the wireless charging power voltage ADC2. When the wireless charging power supply voltage ADC2 is smaller than the preset undervoltage threshold, the first control end HGATE of the charging control chip 30 outputs a low level, so that the first bipolar transistor Q1 and the third bipolar transistor Q3 are turned on and turned off, thereby cutting off the charging loop to stop charging, and realizing hardware undervoltage protection.
The wireless charging power supply voltage ADC2 can also be provided to the controller, the controller monitors whether undervoltage occurs according to the wireless charging power supply voltage ADC2, if yes, a low level is output to the signal transmission node OFF _ CH, the charging control chip 30 is closed, the first bipolar transistor Q1 and the third bipolar transistor Q3 are turned OFF from conduction, and therefore the charging loop is cut OFF to stop charging, and software undervoltage protection is achieved.
Optionally, the patrol robot wireless charging port protection circuit further includes a charging voltage overvoltage monitoring module 80.
The charging voltage overvoltage monitoring module 80 comprises a ninth resistor R9, a tenth resistor R10 and a fourth capacitor C4;
the first end of the ninth resistor R9 is connected with the positive electrode CH + of the wireless charging power supply;
a second end of the ninth resistor R9, a first end of the tenth resistor R10, and a first end of the fourth capacitor C4 are connected to the input end OV of the overvoltage comparator of the charging control chip 30;
a second end of the tenth resistor R10 and a second end of the fourth capacitor C4 are connected to ground in common.
In this embodiment, the ninth resistor R9 and the tenth resistor R10 divide the wireless charging power voltage to obtain the wireless charging power voltage ADC4. When the wireless charging power supply voltage ADC4 is smaller than the preset overvoltage threshold, the first control end of the charging control chip 30 outputs a low level, so that the first bipolar transistor Q1 and the third bipolar transistor Q3 are turned on and off, thereby cutting off the charging loop to stop charging, and implementing hardware overvoltage protection.
The wireless charging power supply voltage ADC4 can also be provided to the controller, the controller monitors whether overvoltage occurs according to the wireless charging power supply voltage ADC4, if so, a low level is output to the signal transmission node OFF _ CH, the charging control chip 30 is closed, and the first bipolar transistor Q1 and the third bipolar transistor Q3 are switched from on to OFF, so that a charging loop is cut OFF to stop charging, and software overvoltage protection is realized.
Optionally, as a preferred example of the present invention, the patrol robot wireless charging port protection circuit further includes a power supply voltage conversion module 90. The power voltage conversion module 90 is used for converting the battery voltage into a power voltage. The power supply voltage is used to provide power, preferably 5V, to the hall sensor in the charging current monitoring module 50, the second resistor R2 and the fifth resistor R5 in the hardware overcurrent protection module 60. Optionally, the power voltage conversion module 90 adopts a dc-to-dc conversion technology.
Fig. 4 is a schematic diagram of a power supply voltage conversion module 90 according to an embodiment of the invention. The power supply voltage conversion module 90 includes a dc converter 91, a first input capacitor C91, a second input capacitor C92, a third input capacitor C93, a first input resistor R91, a second input resistor R92, a fourth input capacitor C94, a third input resistor R93, a first compensation capacitor C95, a second compensation capacitor C96, a first compensation resistor R94, a boost capacitor C97, an energy storage inductor L91, a freewheeling diode D91, a first output resistor R95, a second output resistor R96, a first output capacitor C98, and a second output capacitor C99;
a first end of the first input capacitor C91, a first end of the second input capacitor C92, a first end of the third input capacitor C93, a first end of the first input resistor R91, and an input end VIN of the dc converter 91 are commonly connected to the battery positive electrode VBAT;
the second end of the first input resistor R91 and the first end of the second input resistor R92 are connected to the EN end of the dc-dc converter 91;
the second end of the first input capacitor C91, the second end of the second input capacitor C92, the second end of the third input capacitor C93 and the second end of the second input resistor R92 are connected to the ground in common;
a first end of the fourth input capacitor C94 is connected to a soft start and tracking end SS/TR of the dc converter 91;
a first end of the third input resistor R93 is connected to the operating frequency setting end PT/CLK of the dc converter 91;
a first end of the first compensation capacitor C95 and a first end of the first compensation resistor R94 are commonly connected to an error amplifier output terminal COMP of the dc converter 91;
a second end of the first compensation resistor R94 is connected to a first end of the second compensation capacitor C96;
a second end of the fourth input capacitor C94, a second end of the third input resistor R93, a second end of the first compensation capacitor C95, and a second end of the second compensation capacitor C96 are connected to ground in common;
the first end of the boost capacitor C97, the negative electrode of the freewheeling diode D91 and the first end of the energy storage inductor L91 are connected to the PH end of the dc converter 91;
a second end of the boost capacitor C97 is connected to a boost capacitor end BOOT of the dc converter 91, and an anode of the freewheeling diode D91 is grounded;
a common junction point between the second end of the energy storage inductor L91, the first end of the first output resistor R95, the first end of the first output capacitor C98, and the second end of the second output capacitor C99 serves as an output end of the power supply voltage conversion module 90;
a second end of the first output resistor R95 and a first end of the second output resistor R96 are connected to an output voltage setting end VSENSE of the dc converter 91;
the second end of the second output resistor R96, the second end of the first output capacitor C98, and the second end of the second output capacitor C99 are connected to ground in common.
In this embodiment, the first input capacitor C91, the second input capacitor C92, and the third input capacitor C93 are used to reduce the input voltage fluctuation of the power voltage conversion module 90, so that the input voltage is more stable. The first output capacitor C98 and the second output capacitor C99 are used to reduce the output voltage fluctuation of the power voltage conversion module 90, so that the output voltage is more stable.
The first and second input resistors R91 and R92 set an undervoltage threshold of the output voltage of the dc converter 91 by dividing the battery voltage, and when the battery voltage is lower than the undervoltage threshold, the dc converter 91 stops operating and does not output the voltage.
The fourth input capacitor C94 is used to set a soft start, by which the time for the output voltage of the power supply voltage conversion module 90 to rise from 0V to 5V can be set.
The third input resistor R93 is used to set the switching frequency of the dc converter 91 during operation.
The first compensation capacitor C95, the second compensation capacitor C96 and the first compensation resistor R94 form a frequency compensation function together, so that the dc converter 91 works and compensates to a more stable working frequency point.
The boost capacitor C97 increases the internal voltage of the dc converter 91 by using the principle that the capacitor voltage cannot change suddenly, and drives the internal switch to be turned on and off.
The energy storage inductor L91 is used for storing energy when the dc converter 91 operates in the switch on state, and releasing energy when the dc converter 91 operates in the switch off state.
The freewheeling diode D91 is used to provide a path for current when the dc converter 91 is operating in the switch-off state.
The first output resistor R95 and the second output resistor R96 are used to set an output voltage value, preferably 5V, and different voltage values may be output by adjusting the values of the resistors.
Optionally, as a preferred example of the present invention, the patrol robot wireless charging port protection circuit further includes at least one temperature monitoring module, each temperature monitoring module is formed by connecting a thermistor and a voltage dividing resistor in series, and the connection point of the two is connected to the temperature collecting terminal of the controller; the other end of the divider resistor is connected with a power supply voltage, and the other end of the thermistor is grounded.
In this embodiment, the power voltage may be 5V. In this embodiment, a temperature detection module is configured for the first bipolar transistor Q1 and the third bipolar transistor Q3, the thermistor is close to the bipolar transistor to obtain the real-time temperature of the bipolar transistor during operation, and a voltage division signal is obtained and provided to the controller by utilizing the principle that the thermistor has different resistance values at different temperatures and by dividing the voltage of the power supply. The controller receives the voltage division signal through the temperature acquisition end, so that temperature information corresponding to the bipolar transistor is obtained, and temperature monitoring of the bipolar transistor is achieved. When the temperature signal is greater than the preset temperature threshold, the controller outputs a low level to the signal transmission node OFF _ CH to turn OFF the charging control chip 30, and the first bipolar transistor Q1 and the third bipolar transistor Q3 are turned from on to OFF, so that the charging loop is cut OFF to stop charging, and temperature protection is realized.
It should be noted that the controller is not shown in fig. 2, 3, and 4. In practical applications, the controller may be, for example, a single chip microcomputer.
In conclusion, the patrol robot wireless charging port protection circuit provided by the invention is composed of a surge suppression module, a main switch module, a charging control chip and an output voltage monitoring module; the surge suppression module is connected between the positive pole of the wireless charging power supply and the input end of the main switch control module in series to receive the charging current from the positive pole of the wireless charging power supply and remove the surge current in the charging current, so that the surge impact is smoothed, the damage of the surge impact on circuit components is reduced, and the protection of a wireless charging port is realized; the charging control chip generates a control signal of the main switch module according to the real-time voltage or charging current of the battery, and the main switch module switches on or off a charging loop between the wireless charging power supply and the battery according to the control signal, so that the charging process of the battery is stably and reliably guaranteed, and the charging safety of the battery is improved.
Optionally, an embodiment of the present invention further provides a patrol robot, including a wireless charging port protection circuit of the patrol robot. For the structure and principle of the wireless charging port protection circuit of the patrol robot, please refer to the description of the above embodiments, which is not repeated herein.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a patrol wireless port protection circuit that charges of robot which characterized in that includes:
the device comprises a surge suppression module, a main switch module, a charging control chip and an output voltage monitoring module;
the input end of the surge suppression module is connected with the anode of a wireless charging power supply, and the output end of the surge suppression module is connected with the input end of the main switch control module and the power supply end of the charging control chip;
the controlled end of the main switch control module is connected with the control end of the charging control chip;
the first end of the output voltage monitoring module and the output voltage detection end of the charging control chip are respectively connected with a common joint between the output end of the main switch control module and the positive electrode of the battery;
the second end of the output voltage monitoring module is connected with the feedback input end of a voltage stabilizer of the charging control chip;
the surge suppression module is used for receiving a charging current from the positive pole of the wireless charging power supply and removing the surge current in the charging current;
the charging control chip is used for starting according to the charging current after the surge current is removed and generating a control signal of the main switch module according to the charging current or the real-time voltage of the battery;
the main switch module is used for switching on or switching off a charging loop between the wireless charging power supply and the battery according to the control signal and monitoring the charging current of the battery;
the output voltage monitoring module is used for setting the maximum value of the voltage of the battery before the charging loop is switched on and monitoring the real-time voltage of the battery after the charging loop is switched on.
2. The patrol robot wireless charging port protection circuit of claim 1, wherein the surge suppression module comprises:
the transient suppression circuit comprises a transient suppression diode, a piezoresistor, a first inductor and a first capacitor;
the negative electrode of the transient suppression diode, the first end of the piezoresistor and the first end of the first inductor are connected to the positive electrode of the wireless charging power supply in a shared mode;
the anode of the transient suppression diode and the second end of the piezoresistor are respectively grounded;
a common joint point between the second end of the first inductor and the first end of the first capacitor is used as an output end of the surge suppression module;
the second end of the first capacitor is grounded.
3. The patrol robot wireless charging port protection circuit of claim 2, wherein the main switch module comprises:
the sampling circuit comprises a first bipolar transistor, a second bipolar transistor, a third bipolar transistor, a fourth bipolar transistor and a sampling resistor;
the base electrode of the first bipolar transistor and the base electrode of the third bipolar transistor are connected to a first control end of the charging control chip in a sharing mode, and the collector electrodes of the first bipolar transistor and the third bipolar transistor are connected to the output end of the surge suppression module in a sharing mode;
the emitter of the first bipolar transistor and the emitter of the second bipolar transistor are connected to the common source input end of the charging control chip in a sharing mode; the emitter electrode of the third bipolar transistor is connected with the emitter electrode of the fourth bipolar transistor;
the base electrode of the second bipolar transistor and the base electrode of the fourth bipolar transistor are connected to the second control end of the charging control chip in common; a collector electrode of the second bipolar transistor, a collector electrode of the fourth bipolar transistor and a first end of the sampling resistor are connected to a current detection input end of the charging control chip in common;
and the second end of the sampling resistor and the output voltage detection end of the charging control chip are connected to the anode of the battery in common.
4. The patrol robot wireless charging port protection circuit of claim 2, wherein the output voltage monitoring module comprises:
a first voltage dividing resistor and a second voltage dividing resistor;
the first end of the first divider resistor is connected with the output end of the main switch module;
a common junction point between the second end of the first voltage-dividing resistor and the first end of the second voltage-dividing resistor is connected with a feedback input end of a voltage stabilizer of the charging control chip;
and the second end of the second voltage-dividing resistor is grounded.
5. A patrol robot wireless charging port protection circuit as claimed in any one of claims 1 to 4, wherein the circuit further comprises a charging current monitoring module;
the charging current monitoring module comprises a Hall sensor, a second capacitor and a first resistor;
the positive end of the Hall sensor is connected with the output end of the surge suppression module, and the negative end of the Hall sensor is connected with the input end of the main switch module and the power supply end of the charging control chip;
the output end of the Hall sensor is connected with the first end of the first resistor, and the power supply end is connected with power supply voltage;
a common joint between the second end of the first resistor and the first end of the second capacitor is connected with a current acquisition end of the controller;
and the second end of the second capacitor is grounded.
6. The patrol robot wireless charging port protection circuit of claim 5, further comprising a hardware over-current protection module;
the hardware overcurrent protection module comprises a comparator, a second resistor, a third resistor, a second capacitor, a fourth resistor, a fifth resistor and a sixth resistor;
the inverting input end of the comparator is connected with the output end of the charging current monitoring module;
the second end of the second resistor, the first end of the third resistor and the first end of the second capacitor are connected to the positive-phase input end of the comparator in common;
the output end of the comparator is connected with the first end of the fourth resistor;
a common joint between the second end of the fourth resistor, the first end of the fifth resistor and the first end of the sixth resistor is connected with the fault output end of the charging control chip;
the second end of the sixth resistor is connected with the shutdown control input end of the charging control chip;
and the first end of the second resistor and the second end of the fifth resistor are respectively connected with a power supply voltage.
7. The patrol robot wireless charging port protection circuit of claim 6, further comprising a charging under-voltage monitoring module;
the charging voltage under-voltage monitoring module comprises: a seventh resistor, an eighth resistor and a third capacitor;
the first end of the seventh resistor is connected with the positive electrode of the wireless charging power supply;
the second end of the seventh resistor, the first end of the eighth resistor and the first end of the third capacitor are connected to the input end of the under-voltage comparator of the charging control chip in common;
and a second end of the eighth resistor and a second end of the third capacitor are connected to the ground in common.
8. The patrol robot wireless charging port protection circuit of claim 7, further comprising a charging voltage overvoltage monitoring module;
the charging voltage overvoltage monitoring module comprises a ninth resistor, a tenth resistor and a fourth capacitor;
the first end of the ninth resistor is connected with the positive electrode of the wireless charging power supply;
the second end of the ninth resistor, the first end of the tenth resistor and the first end of the fourth capacitor are connected to the input end of an overvoltage comparator of the charging control chip;
a second end of the tenth resistor and a second end of the fourth capacitor are connected to ground in common.
9. The patrol robot wireless charging port protection circuit of claim 5 or 6, wherein the circuit further comprises a supply voltage conversion module;
the power supply voltage conversion module is used for converting the battery voltage into the power supply voltage of the component.
10. A patrol robot comprising a wireless charging port protection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211502083.5A CN115765096A (en) | 2022-11-28 | 2022-11-28 | Patrol robot wireless charging port protection circuit and patrol robot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211502083.5A CN115765096A (en) | 2022-11-28 | 2022-11-28 | Patrol robot wireless charging port protection circuit and patrol robot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115765096A true CN115765096A (en) | 2023-03-07 |
Family
ID=85339377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211502083.5A Withdrawn CN115765096A (en) | 2022-11-28 | 2022-11-28 | Patrol robot wireless charging port protection circuit and patrol robot |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115765096A (en) |
-
2022
- 2022-11-28 CN CN202211502083.5A patent/CN115765096A/en not_active Withdrawn
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Application publication date: 20230307 |