CN212063521U - Load access recognition device and charging device - Google Patents
Load access recognition device and charging device Download PDFInfo
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- CN212063521U CN212063521U CN201922047689.4U CN201922047689U CN212063521U CN 212063521 U CN212063521 U CN 212063521U CN 201922047689 U CN201922047689 U CN 201922047689U CN 212063521 U CN212063521 U CN 212063521U
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Abstract
The utility model relates to a load inserts recognition device and charging device belongs to the detection of charging technical field. The load access identification device comprises a load end, a control and identification module, a discharge module, a constant current module, a voltage detection module for acquiring the voltage of the load end and a detection reference capacitor connected in parallel to the load end; the control and identification module outputs a detection control signal to the constant current module and is used for controlling the constant current module to apply detection current to the load end; the control and identification module outputs a discharge control signal to the discharge module, and the discharge control signal is used for controlling the discharge module to discharge the detection reference capacitor; the voltage detection module outputs a voltage detection signal to the control and identification module. Based on the added detection reference capacitor, whether a load is connected to the load end or not can be identified by comparing the change of the representation index of the voltage boosting process on the load end before and after the capacitive load is connected to the load end, so that the safety of charging equipment and the like is ensured, and the method can be widely applied to the equipment such as charging and the like.
Description
Technical Field
The utility model belongs to the technical field of the charging technique and specifically relates to a charging control method, charging control device, charging device, load access identification method and load access identification device are related to.
Background
With the progress and development of science and technology, the types of electronic products for off-line work by using rechargeable batteries are gradually increased, and the functions of the electronic products are also gradually increased, such as mobile phones, PADs, notebook computers, cameras, wireless earphones and other electronic devices; however, as the functions of smart terminals such as mobile phones are gradually increased, the power consumption of the batteries is also increased. In order to solve the problem of too high power consumption of electronic devices, generally, increasing the battery charging speed by increasing the battery capacity, reducing the power consumption of the devices and increasing the battery charging speed is a main solution in the industry at present, such as solutions of PD/QC/PE/VOOC/SC, for example, a charging method disclosed in patent document with publication number US2007/0258687 a.
With the development of the quick charging technology, the requirement on the charging line of the accessory device is higher and higher, and how to provide a safe charging environment for the electronic device is a core problem that attention needs to be paid more and more. Some electronic equipment manufacturers in the prior art use a security authentication IC on a data line to ensure that the charging data line is uniquely matched with the original manufacturer, for example, a security chip disclosed in patent document with application number CN201911061698.8 and an authentication method disclosed in patent document with application number CN201911061728.4, in order to improve the charging security of their own equipment.
However, the security certification IC can only ensure the original factory property of the data line, but cannot ensure the security of the charging environment, for example, the charging loop of the existing charging data line is always in an open state, which brings a certain potential safety hazard to the electronic device and even the charging data line, especially the charging habit of the user is that the charging head and the charging data line are always connected to the wiring board, and when the user wets his hands or turns over the water cup on a desk, the whole charging head and the data line may be damaged. Accordingly, there is a need for an improved charging circuit configuration.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a load inserts recognition device and charging device to improve battery charging outfit safety.
In order to achieve the above main objective, the present invention provides a load access identification device, which comprises a load end, a control and identification module, a discharge module, a constant current module, a voltage detection module for obtaining the voltage of the load end, and a detection reference capacitor connected in parallel to the load end; the control and identification module outputs a detection control signal to the constant current module and is used for controlling the constant current module to apply detection current to the load end; the control and identification module outputs a discharge control signal to the discharge module, and the discharge control signal is used for controlling the discharge module to discharge the detection reference capacitor; the voltage detection module outputs a voltage detection signal to the control and identification module.
In the above scheme, based on the detection reference capacitor additionally arranged at the load end, the control and identification module can identify whether the load end has load access in the current detection current application period and before by comparing the change of the voltage at the load end before and after the load end is connected to the capacitive load in the process of charging the detection reference capacitor by using the detection current, so as to better identify whether the load end has load access.
The voltage detection module comprises a voltage division circuit with an input end electrically connected with a load end and a first grounding control switch used for controlling the grounding state of the voltage division circuit; and the control and identification module outputs an on-off control signal to the first grounding control switch. Therefore, the power consumption of the voltage detection module can be controlled to reduce the energy consumption.
The specific scheme is that the discharging module comprises a discharging resistor with an input end electrically connected with the load end, and a second grounding control switch used for controlling the grounding state of the discharging resistor, wherein the discharging control signal is used for controlling the on-off state of the second grounding control switch.
The preferred scheme is that the constant current module comprises a power input end, a first constant current source, a first charging control switch, a first current amplifying tube and a first current limiting resistor which are sequentially arranged in series, a second constant current source, a second charging control switch, a second current amplifying tube and a second current limiting resistor which are sequentially arranged in series, a third constant current source, a third charging control switch, a current limiting tube and a third current limiting resistor which are sequentially arranged in series, a first current sampling resistor, a second current sampling resistor and a third current amplifying tube, wherein one end of the first current sampling resistor, one end of the second current sampling resistor and one end of the third current sampling resistor are electrically connected with the power input end; the grid electrode of the third current amplifying tube is electrically connected with the source electrode of the second current amplifying tube and is used for connecting the first current sampling resistor with the load end; the drain electrode of the first current amplifying tube is electrically connected with the grid electrode of the second current amplifying tube and the grid electrode of the first current amplifying tube, and the grid electrode of the current limiting tube is electrically connected with the source electrode of the current limiting tube; the external connecting end of the first current-limiting resistor is electrically connected with the other end of the first current sampling resistor, and the external connecting end of the second current-limiting resistor and the external connecting end of the third current-limiting resistor are electrically connected with the other end of the second current sampling resistor.
The control and identification module comprises a voltage comparison circuit for judging whether the voltage of the load end reaches a preset threshold value and a delay judgment circuit for carrying out delay logic judgment on a comparison result signal output by the voltage comparison circuit; the delay judging circuit outputs a discharge control signal and a detection control signal.
The delay judging circuit comprises a first D trigger, a second D trigger, a third inverter, a NOR gate, a counter, a first OR gate, a second inverter and an AND gate, wherein the first input end of the AND gate is electrically connected with the output end of the second inverter; the comparison result signal of the voltage comparison circuit forms a clock signal of the first D trigger, and the D end and the 1 setting end of the first D trigger and the 1 setting end and the zero clearing end of the second D trigger are both connected with a high level signal; the D end of the second D trigger is electrically connected with the Q end of the first D trigger through a third inverter; the counter outputs a first decoding signal to a clock signal end of the second D trigger, and outputs a second decoding signal to a zero clearing end of the first D trigger, a first input end of the second OR gate and a first input end of the NOR gate; the Q end of the second D trigger is electrically connected with the second input end of the second OR gate and the second input end of the NOR gate; the output end of the NOR gate is electrically connected with the first input end of the first OR gate, and the second input end of the first OR gate is electrically connected with the Q end of the first D trigger; the output end of the first OR gate is electrically connected with the input end of the second inverter; the output end of the second OR gate is electrically connected with the second input end of the AND gate; the first or gate outputs a discharge control signal, and the and gate outputs a detection control signal.
The voltage comparison circuit comprises a voltage comparator, an input end conduction control switch and an input end grounding control switch, wherein the input end conduction control switch is used for connecting the input end of the voltage comparator with the output end of the voltage detection module; the voltage detection module comprises a voltage division circuit electrically connected with the load end and a first grounding control switch used for controlling the grounding state of the voltage division circuit; the output signal of the second D trigger forms the on-off control signal of the input end conduction control switch and the first grounding control switch, and forms the on-off control signal of the input end grounding control switch through the reverse processing of the first inverter.
The discharging module comprises a discharging resistor electrically connected with a load end and a second grounding control switch tube used for controlling the grounding state of the resistor, and the output end of the first OR gate is electrically connected with the grid electrode of the second grounding control switch tube; the constant current module comprises a power input end, a first constant current source, a first charging control switch tube, a first current amplifying tube and a first current limiting resistor, wherein the first constant current source, the grid electrode and the output end of the AND gate are sequentially arranged in series; the grid electrode of the third current amplifying tube is electrically connected with the drain electrode of the second charge control switch tube and is used for connecting the first current sampling resistor with the load end; the drain electrode of the first charging control switch tube is electrically connected with the grid electrode of the second current amplification tube and the grid electrode of the first current amplification tube, and the grid electrode of the current limiting tube is electrically connected with the drain electrode of the third charging control switch tube; the external connecting end of the first current-limiting resistor is electrically connected with the other end of the first current sampling resistor, and the external connecting end of the second current-limiting resistor and the external connecting end of the third current-limiting resistor are electrically connected with the other end of the second current sampling resistor; the first grounding control switch is a first grounding control switch tube, the input end grounding control switch is an input end grounding control switch tube, and the input end conduction control switch is an input end conduction control switch tube; the first charging control switch tube, the second charging control switch tube, the third charging control switch tube, the first grounding control switch tube, the input end conduction control switch tube and the second grounding control switch tube are NMOS tubes, and the first current amplifying tube, the second current amplifying tube, the third current amplifying tube and the current limiting tube are PMOS tubes.
In order to achieve the above main object, the present invention provides a charging device, which includes a load access identification unit and a charging unit, wherein the load access identification unit includes the load access identification device described in any one of the above technical solutions; the control and identification module outputs a charging control signal to the charging unit.
The specific scheme is that the charging unit comprises a constant current module.
Drawings
Fig. 1 is a flowchart of a load access identification method according to an embodiment of the present invention;
fig. 2 is a flowchart of a charging control method according to an embodiment of the present invention;
fig. 3 is a schematic circuit structure block diagram of an embodiment of the load access identification device of the present invention;
fig. 4 is a schematic structural block diagram of a circuit according to an embodiment of the charging control apparatus of the present invention;
fig. 5 is a circuit diagram of the embodiment of the charging device after omitting the discharging module;
fig. 6 is a circuit diagram of the delay determining circuit in the embodiment of the charging device of the present invention;
fig. 7 is a circuit diagram of the constant current source, the detection reference circuit, the load and the discharging module in the embodiment of the charging device of the present invention;
fig. 8 is a general timing diagram of the charging device according to the embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples and accompanying drawings.
Examples
The utility model discloses a main idea is when utilizing data line etc. to charge to terminals such as cell-phones, based on integrated capacitive load access recognition device in data line, charger or portable power source, judges whether there is load access on the load end to whether decide to apply charging voltage or charging current to the load end, and can calculate and realize with the hardware circuit cooperation based on software to the identification process who inserts the load, also can realize by pure hardware circuit.
As shown in fig. 1, the load access identification method of the present invention includes a detection step S11, an acquisition step S12 and a determination step S13, and as shown in fig. 2, the charging control method constructed based on the load access identification method includes a detection step S21, an acquisition step S22, a determination step S23 and a start charging step S24.
As shown in fig. 3, the load access identification device 1 includes a detection reference capacitor C1 connected in parallel to a load terminal 13, a control and identification module 10 for calculating and generating a control signal, a constant current module 11 for outputting a detection current, a voltage detection module 12 for detecting a voltage at the load terminal 13, and a discharge module 14 for discharging the detection reference capacitor C1 charged by the detection current; in the working process, the working states of the constant current module 11, the voltage detection module 12 and the discharge module 14 are all controlled by the control and identification module 10. In the present embodiment, the discharging module 14 is composed of a discharging resistor R6 and a switching tube 141 controlled by the control and identification module 10.
The control and identification module 10 includes a processor 100 and a memory 101, where the memory 101 stores a computer program, and when the computer program is executed by the processor 100, the steps of the load access identification method shown in fig. 1 can be implemented, and the specific process is as follows:
in the detection step S11, a detection current of a constant current is intermittently applied to the load terminal to which the detection reference capacitor is connected in parallel, and the detection reference capacitor charged by the detection current is discharged. In this step, specifically, the control and identification module 10 controls the constant current module 11 to apply a constant detection current to the load terminal 13 connected in parallel with the detection reference capacitor C1, and controls the discharge module 14 to discharge the detection reference capacitor C1 charged by the detection current; during operation, the voltage detection module 12 outputs a voltage detection signal to the control and identification module 10, and outputs an operating state control signal to the constant current module 11 and the switching tube Q8 based on the setting of a program in advance, so as to control the constant current module 11 to output a detection current and control the on/off of the switching tube Q8.
Based on intermittent charging and discharging, the identification requirement can be met, and the power consumption can be reduced by controlling the charging and discharging frequency; the charging and discharging frequency may be charging and discharging according to a set frequency, that is, charging and discharging at regular time, or determining the charging and discharging time according to the voltage detection result at the load end, for example, applying the detection current for a predetermined time after the detected voltage at the load end 13 is reduced to a predetermined value to charge the detection reference capacitor C1, and for the charging time, the default charging time is t0. The starting control of the discharging process is usually to discharge immediately after the charging process is completed, or to discharge the detection reference capacitor C1 when the voltage at the load terminal 13 reaches a preset value or the charging time period of the detection reference capacitor C1 reaches a preset value.
In the obtaining step S12, a change characterization indicator of the voltage of the load terminal 13 during the application of the detection current is obtained.
A constant current module 11 is used for applying a detection current to a detection reference capacitor C1 through a load end 13, and as the charging time length increases, the voltage at two ends of the detection reference capacitor C1 increases, that is, the voltage at two ends of the load end 13 increases; if the capacitive load is connected, the capacitance value connected to the load terminal 13 is increased, and since the detection reference capacitance is a small capacitance, the capacitance value is much smaller than the capacitance value of the connected load, so that the process of applying the voltage of the load terminal 13 along with the detection current is not slow, and based on this, the control and identification module 10 can calculate the voltage change representation index for determining whether the load is connected to the load terminal 13 according to the change data of the voltage detection value output by the voltage detection module 12.
In the determining step S13, if the difference between the voltage variation characterization indicator and the reference indicator in the current detection current application period satisfies the preset reference, a load is connected to the load terminal.
The voltage variation characterization indicator may be a preset indicator calculated in advance according to circuit design, for example, a preset voltage value V obtained by boosting the voltage of the detection reference capacitor C1 under charging of a predetermined constant current0Reference time length T of0The reference duration T is used in the subsequent calculation process0For reference, a preset reference is set by considering a reasonable fluctuation range, or a voltage change characterization index in the previous detection current application period, namely adjacent last detection data is taken as a reference, so that the influence of environmental factors on the charging process of the detection reference capacitor C1 can be effectively considered, or the average of the voltage change characterization indexes in the previous detection current application periods is taken, and the fluctuation caused by adopting a single detection value is effectively avoided. In addition, the identification judgment process can also be a calibration value measured when the power is firstly turned on after the power is cut off, and the identification judgment process is started after the measurement of the calibration value is completed. For example, when the voltage variation characterization index is within a preset range, if the characterization has no load access, the characterization that the difference satisfies the preset reference does not fall within the preset range, or the deviation from the preset value exceeds a threshold value, and the like.
The reference index is specifically represented by a numerical value, and may be a single numerical value or a numerical range, at this time, a difference between the voltage change characterization index and the reference index satisfies a preset reference, that is, a difference between the voltage change characterization indexes exceeds a preset threshold, and the preset threshold is determined after a reasonable fluctuation range is considered, and specifically may be a time length for boosting the voltage to a preset value, or a boosting rate, or a voltage value after applying a detection current for a predetermined time length.
To the utility model discloses the realization of the control method of charging can be realized based on the control device 2 that charges as shown in fig. 4, with based on software calculation and control the charging process, this control device that charges can be charger or data line, this control device 2 that charges includes detection reference electric capacity C1 that connects in parallel on load end 23, a control and identification module 20 for calculating and generating control signal, a constant current module 21 for exporting the detection current, a voltage detection module 22 for detecting the voltage of load end 23, and a discharge module 24 for discharging detection reference electric capacity C1 after charging through the detection current; in the working process, the working states of the constant current module 21, the voltage detection module 22 and the discharge module 24 are all controlled by the control and identification module 20. In the present embodiment, the discharging module 24 is composed of a discharging resistor R6 and a switching tube 241 controlled by the control and identification module 20.
If the charging control device 2 is a charger, the input voltage Vin is commercial power, and at this time, a charging module can be constructed by using the constant current module 21, so that the load to be charged connected to the load terminal 23 is charged with a constant current by using the constant current module 21, or an independent charging module can be provided, so that the load to be charged is charged by using the charging module; if the charging control device is a data line, the input voltage Vin can be controlled to charge the load to be charged based on the additional control module.
The control and identification module 20 includes a processor 200 and a memory 201, the memory 201 stores a computer program, and the computer program, when executed by the processor 200, can implement the steps of the charging control method shown in fig. 2, wherein the detecting step S21, the obtaining step S22 and the determining step S23 are the same as the steps of the load access identification method, and are not described herein again, and the charging starting step S24 includes a charging starting step that, after identifying that the load terminal 13 has a load access, the charging circuit is started to charge, that is, when a difference between a voltage change representation index and a reference index of the load terminal in a current detection current application period exceeds a preset reference, the charging circuit is controlled to start to charge.
As shown in fig. 5 to fig. 7, the circuit structure diagram of the charging device of the present invention includes the structure diagram of the middle load access identification device of the present invention to utilize the hardware circuit to realize the load access identification process and the charging control process, and in the following description, the structure description of the charging device is taken as the main and the structure of the charging device and the load access identification device is exemplarily described.
The charging device comprises a power supply end 55, a load end 53, a detection reference capacitor C1, a discharging module, a control and identification module, a constant current module for outputting a detection current and a charging current which are constant currents to the load end 53, and a voltage detection module for acquiring the voltage of the load end 53. The detection reference capacitor C1 is connected in parallel to the load terminal 53, that is, in parallel with the load to be charged connected to the load terminal 53, in this embodiment, a constant current module is used to construct the charging module.
As shown in fig. 5, the voltage detection module includes a voltage divider circuit electrically connected to the load terminal 53, and a first ground control switch Q9 for controlling a ground state of the voltage divider circuit, the voltage divider circuit is connected to the load terminal 53 through a resistor R7 and a resistor R8 arranged in series, and the first ground control switch Q9 is used for controlling the ground state of the voltage divider circuit.
The control and identification module comprises a voltage comparison circuit and a time delay judgment circuit shown in figure 6; as shown in fig. 5, the voltage comparison circuit includes a comparator COMP, an input end ground control switch Q10, an input end conduction control switch Q11, and a first inverter INV1, wherein an output end of the first inverter INV1 is electrically connected to a gate of the input end ground control switch Q10, so as to control an on/off state of the switch Q10; the input end turn-on control switch tube Q11 is connected in series between the output end of the resistor R7 and a first input end of the comparator COMP, and a second input end of the comparator COMP is connected to the reference voltage Verf.
As shown in fig. 6, the delay determining circuit includes a first D flip-flop, a second D flip-flop, a third inverter INV3, a nor gate, a counter 42, a first or gate, a second inverter INV2, and an and gate having a first input end electrically connected to an output end of the second inverter INV 2.
As shown in fig. 5 and 8, the constant current module includes a power input terminal 55, a first constant current source i1, a first charge control switch Q4, a first current amplifier Q2 and a first current limiting resistor R5 sequentially arranged in series, a second constant current source i2, a second charge control switch Q5, a second current amplifier Q3 and a second current limiting resistor R3 sequentially arranged in series, a third constant current source i3, a third charge control switch Q7, a current limiting tube Q6 and a third current limiting resistor R4 sequentially arranged in series, a first current sampling resistor R1 and a second current sampling resistor R2, one end of which is electrically connected to the power input terminal, and a third current amplifier Q1; the grid electrode of the third current amplifying tube Q1 is electrically connected with the drain electrode of the second charge control switch tube Q5, and is used for connecting the first current sampling resistor R1 with the load terminal 53; the drain electrode of the first charging control switch tube Q4 is electrically connected with the grid electrode of the second current amplifying tube Q3 and the grid electrode of the first current amplifying tube Q2, and the grid electrode of the current limiting tube Q6 is electrically connected with the drain electrode of the third charging control switch tube Q7; the external connection end of the first current limiting resistor R5 is electrically connected with the other end of the first current sampling resistor R1, and the external connection end of the second current limiting resistor R3 and the external connection end of the third current limiting resistor R4 are electrically connected with the other end of the second current sampling resistor R2.
As shown in fig. 7, the discharge module includes a discharge resistor R6 electrically connected to the load terminal 53 and a second ground control switch Q9 for controlling the ground state of the resistor R6.
As shown in fig. 6, in the delay determining circuit, the comparison result signal OK of the voltage comparing circuit constitutes a clock signal of the first D flip-flop, and the D terminal and the 1 setting terminal of the first D flip-flop and the 1 setting terminal and the clear setting terminal of the second D flip-flop are both connected to the high level signal VDD; the D end of the second D trigger is electrically connected with the Q end of the first D trigger through a third inverter INV 3; the counter outputs a first decoding signal ADD _ OK1 to a clock signal end of the second D flip-flop, and outputs a second decoding signal ADD _ OK0 to a clear end of the first D flip-flop, a first input end of the second OR gate and a first input end of the NOR gate; the Q terminal of the second D flip-flop is electrically connected to the second input terminal of the second or gate, the second input terminal of the nor gate, the input terminal of the first inverter INV1, the gate of the first ground control switch Q9, and the gate of the input conduction control switch Q11, that is, the second D flip-flop outputs a Load _ OK signal to them; the output end of the nor gate is electrically connected with the first input end of the first or gate, the second input end of the first or gate is electrically connected with the Q end of the first D flip-flop so as to receive the OK _ Lat signal output by the first or gate, and the output end of the first or gate is electrically connected with the grid electrode of the second grounding control switch tube Q8 and the input end of the second inverter INV2 so as to output a Dchar _ EN signal to the first or gate and the second D flip-flop; an output terminal of the second or gate is electrically connected to a second input terminal of the and gate to output a charge _ EN signal thereto.
In the working process, the constant current module provides a constant charging current for the external load 01 and provides a charging current for the detection reference capacitor C1; the resistors R7 and R8 form a sampling voltage dividing resistor for sampling the output voltage Vout of the load terminal 53; the first grounding control switch tube Q9 is an NMOS control tube and is used for turning on or turning off sampling; the input end of the NMOS control tube is connected with the ground control switch tube Q10 and the input end of the NMOS control tube is connected with the control switch tube Q11 and is used for bypassing the sampling resistor; the comparison reference voltage of the comparator COMP is Vref, and when Vout (R8/(R7+ R8)) > Vref, the output OK signal is 1, i.e., a high level signal, otherwise, it is 0, i.e., a low level signal.
As shown in fig. 6, the delay determining circuit is configured to perform a delay logic determination on the OK signal output by the comparator COMP, and finally output three control signals DChaneg _ EN, Change _ EN and Load _ OK, where DChaneg _ EN is a discharge enable signal, Change _ EN is a charge enable signal, and Load _ OK is responsible for turning off the comparator.
The counter 42 is used for counting according to the clock signal thereof, the signals ADD _ OK0 and ADD _ OK1 are decoding outputs of the counter 42 counting to a predetermined value, as shown in fig. 8, the counting period is 0 to c, and the counting period is divided into three sequentially adjacent stages, namely, stages 0 to a, stages a to b and stages b to c, wherein a, b and c are preset values and are the number of clock pulses in the stages, and ADD _ OK0 is high level in the stages a to c and low level in the stages 0 to a; ADD _ OK1 is high during the stages b-c and low during the stages 0-b.
In the constant current module, constant current sources i1, i2 and i3 are all current sources, i4 is charging current, a first charging control switch tube Q4, a second charging control switch tube Q5, a third charging control switch tube Q7 and a second grounding control switch tube Q8 are NMOS control tubes, the first charging control switch tube Q4, the second charging control switch tube Q5 and the third charging control switch tube Q7 control charging, and Q8 controls discharging; the third current amplifying tube Q1, the first current amplifying tube Q2 and the second current amplifying tube Q3 are all PMOS, so that a current amplifier is formed, and the current limiting tube Q6 is a PMOS current limiting tube.
When amplifier COMP is operating normally:
V1＝V2；
(Vin-V1)/R1＝i4+i1；
(Vin-V2)/R2＝i2+i3；
from the above three equations, it can be calculated:
i4 ═ (R2/R1) × (i2+ i3) -i 1, so that the charging current in the present embodiment is constructed using a constant current source.
As shown in fig. 8, when the charging line is connected to Vin, in the initial stage, the Load terminal 53 has no output voltage and the OK signal is at low level, and the signals ADD _ OK0 and ADD _ OK1 output by the counter 42 are both low level signals, so that the output signal OK _ Lat of the first D flip-flop and the output signal Load _ OK of the second D flip-flop are both low level signals, and based on this, the signal DChaneg _ EN is at high level and Change _ EN is at low level; with the counting stages a to b, the ADD _ OK0 is turned to high level, so that the Change _ EN is turned to high level to control the constant current source 40 to charge the small capacitor C1, when Vout is subjected to constant current charging through t0(t0< t1) until the constant current is greater than V0, the signals OK and DCharge _ EN are both pulled high, the trigger circuit discharges rapidly, Vout becomes 0 instantaneously, and the counting stages are counting stages a to b; when a Load is connected into a Load terminal, Vout rises along with slow charging of the circuit, does not rise to V0 after t2, and after t2, Load _ OK is pulled high to indicate that the Load is connected, and then the Load is charged with constant current until Vout is equal to Vin.
That is, in this embodiment, when the load is not connected to the charging line, the detection circuit periodically charges the detection reference capacitor C1, which is a small capacitor, with a constant current, and the voltage Vout at the load end 53 will quickly rise to a certain voltage within a specified time, and then immediately discharge, and this process will be repeated until the load is connected; when a LOAD is connected with a charging wire, because the LOAD capacitance LOAD of the LOAD is large, the detection circuit carries out constant current charging on the LOAD capacitance, the voltage of the LOAD end cannot rise to a certain voltage in a specified time, finally, the circuit transmits a marking signal Load _ OK to indicate that the LOAD is connected, and the voltage change characterization index is configured into a voltage value after the detection current with preset time length is applied.
That is, for the load access identification device, during the operation, the control and identification module is used for controlling the constant current module to intermittently apply the detection current to the load terminal 53, controlling the discharging module to discharge the detection reference capacitor C1 charged by the detection current, and outputting the identification result signal indicating that the load is accessed at the load terminal when the difference between the voltage change representation index and the reference index of the load terminal 53 in the current detection current application period exceeds the preset reference. For the charging device, the identification result signal constitutes a control signal for starting charging of the charging unit, that is, when the difference between the voltage variation representation index and the reference index of the load terminal 53 in the current detection current application period exceeds the preset reference, the constant current module is controlled to charge the accessed load to be charged.
In the above embodiment, the voltage detection module, the discharge module, the voltage comparison circuit and the constant current source are all constructed by using MOS transistors to construct the on-off control switch, and may also be constructed by using other switching transistors, and may also be constructed by using electronic components other than the switching transistors, for example, by using a relay.
Claims (10)
1. A load access identification device is characterized by comprising a load end, a control and identification module, a discharge module, a constant current module, a voltage detection module for acquiring the voltage of the load end and a detection reference capacitor connected in parallel to the load end;
the control and identification module outputs a detection control signal to the constant current module and is used for controlling the constant current module to apply detection current to the load end;
the control and identification module outputs a discharge control signal to the discharge module, and the discharge control signal is used for controlling the discharge module to discharge the detection reference capacitor;
and the voltage detection module outputs a voltage detection signal to the control and identification module.
2. The load access identification device of claim 1, wherein:
the voltage detection module comprises a voltage division circuit of which the input end is electrically connected with the load end and a first grounding control switch for controlling the grounding state of the voltage division circuit; and the control and identification module outputs an on-off control signal to the first grounding control switch.
3. The load access identification device of claim 1, wherein:
the discharging module comprises a discharging resistor with an input end electrically connected with the load end, and a second grounding control switch used for controlling the grounding state of the discharging resistor, wherein the discharging control signal is used for controlling the on-off state of the second grounding control switch.
4. A load access identification device according to any of claims 1 to 3, characterized in that:
the constant current module comprises a power input end, a first constant current source, a first charging control switch, a first current amplifying tube and a first current limiting resistor which are sequentially arranged in series, a second constant current source, a second charging control switch, a second current amplifying tube and a second current limiting resistor which are sequentially arranged in series, a third constant current source, a third charging control switch, a current limiting tube and a third current limiting resistor which are controlled by the detection control signal, a first current sampling resistor, a second current sampling resistor and a third current amplifying tube, wherein one end of the first constant current source, the first charging control switch, the first current amplifying tube and the first current limiting resistor are electrically connected with the power input end; the grid electrode of the third current amplifying tube is electrically connected with the drain electrode of the second current amplifying tube and is used for connecting the first current sampling resistor with the load end; the drain electrode of the first current amplifying tube is electrically connected with the grid electrode of the second current amplifying tube and the grid electrode of the first current amplifying tube, and the grid electrode of the current limiting tube is electrically connected with the source electrode of the current limiting tube; the external connection end of the first current-limiting resistor is electrically connected with the other end of the first current sampling resistor, and the external connection end of the second current-limiting resistor and the external connection end of the third current-limiting resistor are electrically connected with the other end of the second current sampling resistor.
5. A load access identification device according to any of claims 1 to 3, characterized in that:
the control and identification module comprises a voltage comparison circuit for judging whether the voltage of the load end reaches a preset threshold value or not and a delay judgment circuit for carrying out delay logic judgment on a comparison result signal output by the voltage comparison circuit; the time delay judging circuit outputs the discharge control signal and the detection control signal.
6. The load access identification device of claim 5, wherein:
the delay judging circuit comprises a first D trigger, a second D trigger, a third inverter, a NOR gate, a counter, a first OR gate, a second inverter and an AND gate, wherein the first input end of the AND gate is electrically connected with the output end of the second inverter; the comparison result signal of the voltage comparison circuit forms a clock signal of the first D trigger, and the D end and the 1 setting end of the first D trigger and the 1 setting end and the zero clearing end of the second D trigger are both connected with a high-level signal; the D end of the second D trigger is electrically connected with the Q end of the first D trigger through the third inverter; the counter outputs a first decoding signal to a clock signal end of the second D trigger, and outputs a second decoding signal to a zero clearing end of the first D trigger, a first input end of the second OR gate and a first input end of the NOR gate; the Q end of the second D flip-flop is electrically connected with the second input end of the second OR gate and the second input end of the NOR gate; the output end of the NOR gate is electrically connected with the first input end of the first OR gate, and the second input end of the first OR gate is electrically connected with the Q end of the first D flip-flop; the output end of the first OR gate is electrically connected with the input end of the second inverter; the output end of the second OR gate is electrically connected with the second input end of the AND gate;
the first OR gate outputs the discharge control signal, and the AND gate outputs the detection control signal.
7. The load access identification device of claim 6, wherein:
the voltage comparison circuit comprises a voltage comparator, an input end conduction control switch and an input end grounding control switch, wherein the input end conduction control switch is used for connecting the input end of the voltage comparator with the output end of the voltage detection module;
the voltage detection module comprises a voltage division circuit electrically connected with the load end and a first grounding control switch used for controlling the grounding state of the voltage division circuit;
the output signal of the second D trigger forms the on-off control signal of the input end conduction control switch and the first grounding control switch, and the on-off control signal of the input end grounding control switch is formed through the reverse processing of the first phase inverter.
8. The load access identification device of claim 7, wherein:
the discharge module comprises a discharge resistor electrically connected with the load end and a second grounding control switch tube used for controlling the grounding state of the resistor, and the output end of the first OR gate is electrically connected with the grid electrode of the second grounding control switch tube;
the constant current module comprises a power input end, a first constant current source, a first charging control switch tube, a first current amplifying tube and a first current limiting resistor, wherein the first constant current source, the grid electrode and the output end of the AND gate are sequentially arranged in series; the grid electrode of the third current amplifying tube is electrically connected with the drain electrode of the second charge control switch tube and is used for connecting the first current sampling resistor with the load end; the drain electrode of the first charging control switch tube is electrically connected with the grid electrode of the second current amplifying tube and the grid electrode of the first current amplifying tube, and the grid electrode of the current limiting tube is electrically connected with the drain electrode of the third charging control switch tube; the external connecting end of the first current limiting resistor is electrically connected with the other end of the first current sampling resistor, and the external connecting end of the second current limiting resistor and the external connecting end of the third current limiting resistor are electrically connected with the other end of the second current sampling resistor;
the first grounding control switch is a first grounding control switch tube, the input end grounding control switch is an input end grounding control switch tube, and the input end conduction control switch is an input end conduction control switch tube; the first charging control switch tube, the second charging control switch tube, the third charging control switch tube, the first grounding control switch tube, the input end conduction control switch tube and the second grounding control switch tube are NMOS tubes, and the first current amplifying tube, the second current amplifying tube, the third current amplifying tube and the current limiting tube are PMOS tubes.
9. A charging device comprises a load access identification unit and a charging unit, and is characterized in that:
the load access identification unit comprises the load access identification device of any one of claims 1 to 8;
and the control and identification module outputs a charging control signal to the charging unit.
10. The charging device according to claim 9, wherein:
the charging unit comprises the constant current module.
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| CN201922047689.4U CN212063521U (en) | 2019-11-22 | 2019-11-22 | Load access recognition device and charging device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078719A (en) * | 2021-05-11 | 2021-07-06 | 中国煤炭科工集团太原研究院有限公司 | Mining storage battery pack identification method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113078719A (en) * | 2021-05-11 | 2021-07-06 | 中国煤炭科工集团太原研究院有限公司 | Mining storage battery pack identification method and system |
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