CN212781148U - On-line detection circuit, charger and electronic equipment - Google Patents
On-line detection circuit, charger and electronic equipment Download PDFInfo
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- CN212781148U CN212781148U CN202020659431.XU CN202020659431U CN212781148U CN 212781148 U CN212781148 U CN 212781148U CN 202020659431 U CN202020659431 U CN 202020659431U CN 212781148 U CN212781148 U CN 212781148U
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
Abstract
The utility model discloses a detection circuitry, charger and electronic equipment on throne for detect external equipment's information on throne. The in-place detection circuit includes: a first voltage dividing circuit, a second voltage dividing circuit, a charge storage circuit, and a voltage dividing circuit; the first voltage division circuit is connected with the port circuit in parallel; the second voltage division circuit is connected in series with the first voltage division circuit; the charge storage circuit is connected with the second voltage division circuit in parallel; the first switch circuit is connected between the discharge circuit and the charge storage circuit in series and used for discharging the charge storage circuit; the main control unit of the electronic device can determine the in-place information of the external device according to the voltage of the second voltage division circuit and/or control the discharge circuit to change the voltage of the second voltage division circuit.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a detection circuitry, charger and electronic equipment on throne.
Background
In order to control or operate a device, it is often necessary to detect whether the device is in place, for example, in order for a charger to charge a battery, it is necessary to detect whether the battery is in place, i.e., whether the battery is plugged into the charger. For some small electronic devices, such as chargers used to charge small-sized, high-density batteries, the design typically fails to use terminals for multi-pin output, only positive and negative terminals, and thus fails to provide in-place signal detection. It is therefore desirable to provide an in-situ detection circuit to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a detection circuitry, charger and electronic equipment on throne for detect external equipment's information on throne.
In a first aspect, the present invention provides an on-site detection circuit, which is used for detecting whether a port circuit of an electronic device is connected with an external device, wherein the external device includes a battery; the in-place detection circuit includes:
a first voltage divider circuit connected in parallel with the port circuit;
a second voltage dividing circuit connected in series with the first voltage dividing circuit, the voltage dividing capability of the second voltage dividing circuit being greater than that of the first voltage dividing circuit;
a charge storage circuit connected in parallel with the second voltage divider circuit;
the first switch circuit is connected between the discharge circuit and the charge storage circuit in series and used for discharging the charge storage circuit;
the main control unit of the electronic device can determine the in-place information of the external device according to the voltage of the second voltage division circuit and/or control the discharge circuit to change the voltage of the second voltage division circuit.
In the on-site detection circuit provided by the present invention, one end of the second voltage dividing circuit is connected to the first voltage dividing circuit, and the other end of the second voltage dividing circuit is grounded;
one end of the first switch circuit is connected with the side, close to the port, of the port circuit through the discharge circuit, the other end of the first switch circuit is connected with the grounding end of the second voltage division circuit, and the first switch circuit is controlled by a main control unit of the electronic equipment.
The utility model provides an in situ detection circuit, the port circuit includes second switch circuit, second switch circuit is controlled by electronic equipment's main control unit, first divider circuit with second switch circuit is parallelly connected.
In the on-site detection circuit provided by the present invention, the first voltage dividing circuit includes at least one resistor.
The utility model provides an in situ detection circuit, first voltage divider circuit still includes the diode, the diode with the resistance of first voltage divider circuit is established ties, just the direction that switches on of diode with the current direction of port circuit during operation is the same.
The utility model provides an in situ detection circuit, the positive pole of diode with the one end of keeping away from the port among the second switch circuit is connected, the negative pole of diode with the one end of the resistance of first divider circuit is connected, the other end of the resistance of first divider circuit with be close to among the second switch circuit the one end of port is connected.
In the present invention, the charge storage circuit comprises at least one capacitor.
The utility model provides an in situ detection circuit, second voltage divider circuit includes two at least resistances, two resistances are established ties.
The utility model provides an in situ detection circuit, second voltage division circuit includes voltage detection circuit, voltage detection circuit's one end is connected between two resistances of second voltage division circuit, voltage detection circuit's the other end with the main control unit is connected, is used for detecting the voltage of second voltage division circuit.
The utility model provides an in situ detection circuit, in situ detection circuit still includes filter capacitor, filter capacitor's one end with voltage detection circuit connects, filter capacitor's other end ground connection.
The utility model provides an in situ detection circuit, discharge circuit includes at least one resistance, just discharge circuit's resistance is less than the resistance of second divider circuit's resistance.
The utility model provides an in situ detection circuit, first switch circuit includes field effect transistor, first switch circuit's field effect transistor's one end with discharge circuit connects, first switch circuit's the other end with the earthing terminal of second divider circuit is connected.
The utility model provides an in-place detection circuit, second switch circuit includes first field effect transistor, second field effect transistor and third field effect transistor, first field effect transistor and second field effect transistor butt joint, the grid of first field effect transistor and second field effect transistor all with the drain electrode or the source electrode of third field effect transistor are connected, correspondingly the source electrode or the drain electrode ground connection of third field effect transistor, the grid of third field effect transistor with the main control unit is connected, is used for receiving main control unit's control signal and realizes switching on or breaking off of second switch circuit.
In a second aspect, the present invention further provides a charger, the charger comprising at least one port circuit, the port circuit being capable of accessing an external device, the external device comprising a battery; the port circuit is further connected with an in-place detection circuit as described in any one of the above, and is used for detecting in-place information of the external device so as to charge the external device according to the in-place information.
A third aspect of the present invention further provides an electronic device, the electronic device includes a port circuit, the port circuit can access an external device, wherein the port circuit is further connected to the in-place detection circuit according to any one of the above mentioned items, for detecting the in-place information of the external device.
The utility model provides a detection circuitry, charger and electronic equipment on throne can the short-term test go out the information on throne of connecting the external equipment at electronic equipment port circuit to carry out corresponding operation according to this information on throne. For example, the charger uses the on-position detection circuit to detect the on-position information of the battery, and performs charging according to the on-position information, and even the charger only comprising positive and negative terminals can use the on-position detection circuit, thereby improving the reliability of the charging function of the charger, and simultaneously, the on-position detection circuit has simple structure, and further reducing the cost of the charger.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic circuit diagram of an existing in-place detection circuit provided in an embodiment of the present invention;
fig. 2 is a schematic diagram of a specific circuit structure of a conventional on-site detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an in-place detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating the effect of voltage drop in the trench according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of another in-place detection circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a second switch circuit according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of another in-place detection circuit according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of another in-place detection circuit according to an embodiment of the present invention;
fig. 9 is a schematic circuit diagram of another in-place detection circuit according to an embodiment of the present invention;
fig. 10 is a schematic circuit diagram of another in-place detection circuit according to an embodiment of the present invention;
fig. 11 is a schematic circuit diagram of another in-place detection circuit according to an embodiment of the present invention;
fig. 12 is a schematic circuit diagram of another in-place detection circuit according to an embodiment of the present invention;
fig. 13 is a schematic circuit diagram of another in-place detection circuit according to an embodiment of the present invention;
fig. 14 is a schematic circuit diagram of an in-place detection circuit according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of a charger according to an embodiment of the present invention;
fig. 16 is a block diagram illustrating a structure of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
For some electronic devices, it is sometimes necessary to know the in-place information of the external device, so as to facilitate corresponding control or operation. For example, in order for a charger to charge a battery, it is necessary to detect the presence information of the battery, i.e., whether the battery is inserted into the charger. For some small chargers, the general structure design does not use the terminals of the multi-pin output, only the positive and negative terminals, and therefore does not provide in-place signal detection.
Therefore, a corresponding on-site detection circuit needs to be designed, as shown in fig. 1, the scheme of the on-site detection circuit that is mostly adopted at present is to arrange an MOS switch on a charging port of a charger, and implement on-site signal detection of a battery by connecting the MOS switch with a negative pin of the battery. Specifically, the MOS switch is controlled by a Micro Controller Unit (MCU) of the charger, a drain D of the MOS switch is connected to a preset power supply of 3.3V through a resistor R0, and a source S of the MOS switch is grounded, where the drain D of the MOS switch is used as a detection point of an on-site signal.
Specifically, before the battery is inserted into the charger, the MOS switch is in an off state, and at this time, the preset power supply 3.3V forms a high level at the drain D of the MOS switch through the resistor R0, and the MCU determines that the on-site information is "battery not inserted" when detecting the high level. After the battery is inserted into the charger, two negative pins of the battery are connected with the drain D and the source S of the MOS switch, so that the drain D of the MOS switch is pulled down, and the MCU detects a low-level signal, namely judges that the in-place information is 'battery insertion'. Due to the through-flow requirement of the pins of the battery, when the battery is inserted and starts to be charged, the MCU controls the MOS switch to be turned on so that the MOS switch is turned on, and then the battery is charged.
The specific circuit structure of the on-bit detection circuit in fig. 1 is specifically shown in fig. 2. BAT-is connected with the negative terminal of the battery in the circuit, the drain D of the MOS switch Q1 is connected with a preset voltage VCC through a resistor R0, the preset voltage VCC is 3.3V, the source S of the MOS switch Q1 is grounded, and the grid G of the MOS switch Q1 is used for receiving a control signal of the MCU. Specifically, the gate G of the MOS switch Q1 is connected to the control pin of the MCU through a resistor R1, wherein the gate G and the source S of the MOS switch Q1 are also connected through a resistor R2, and the resistor R2 is used to protect the cover MOS switch.
The in-place detection circuit scheme of fig. 1 has two disadvantages: firstly, an MOS switch with high price and low on-resistance is needed, and when charging is started, the MOS is turned on to allow a part of current to pass through the MOS; secondly, when the rechargeable battery is pulled out, the MOS switch is in a conducting state at the moment, so that the on-position signal maintains a low level, and the charger cannot judge whether the battery is pulled out.
In addition, for a multi-channel output charger, i.e. capable of charging a plurality of batteries simultaneously, it is necessary to detect an in-place signal of each battery for managing the charging sequence and the charging state of each battery. For example, after a battery is inserted, the charger needs to detect that a new battery is inserted, and then the charging sequence is performed again; or when one battery is pulled out, if the charger fails to detect, the other batteries cannot be charged. If the scheme in figure 1 is used,
therefore, the utility model provides an on-the-spot detection circuitry, charger and electronic equipment. The on-site detection circuit can detect the on-site information of the external equipment and detect that the on-site information of the external equipment is in a pull-out state, and does not need to use a high-price MOS switch with low on-resistance, thereby reducing the cost of the circuit. The charger may be a charging box for receiving one or more batteries. The presence detection circuit is provided in the charger for detecting presence information of an external device including the battery.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of an in-place detection circuit according to an embodiment of the present invention. The on-site detection circuit can be applied to electronic equipment such as a charger and the like and is used for detecting on-site information of external equipment including a battery.
As shown in fig. 3, the presence detection circuit 100 is connected to the port circuit 10 of the electronic device, and detects presence information of the external device 20 connected to the port circuit 10. The port circuit 10 may specifically be a charging circuit for charging the external device 20, the port circuit 10 may include a control switch or other electronic components, and the port of the port circuit 10 may be plugged into or unplugged from the external device 20. According to the states of the external device 20 such as the insertion and extraction, the in-place information of the external device 20 includes: "insert" and "extract" information.
Note that, in the embodiment of the present invention, the external device 20 is an electronic device including a battery, and may be a battery device.
The presence detection circuit 100 includes: a first voltage dividing circuit 11, a second voltage dividing circuit 12, a charge storage circuit 13, a discharge circuit 14, and a first switch circuit 15.
The first voltage dividing circuit 11 is connected in parallel with the port circuit 10, specifically, for example, the first voltage dividing circuit 11 is connected in parallel with the control switch k1 of the port circuit 10, or the first voltage dividing circuit 11 is connected in parallel with other components or combinations of components of the port circuit 10.
The second voltage dividing circuit 12 is connected in series with the first voltage dividing circuit 11, and is used for dividing the voltage, such as dividing the voltage Vm, together with the first voltage dividing circuit 11. Here, the voltage dividing capability of the second voltage dividing circuit 12 is greater than that of the first voltage dividing circuit 11, and thus the voltage dividing capability of the second voltage dividing circuit 12 is greater than that of the first voltage dividing circuit 11.
In some embodiments, the voltage dividing capability of the second voltage dividing circuit 12 may be set to be much larger than the voltage dividing capability of the first voltage dividing circuit 11, the purpose of the much larger is to make the voltage dividing capability of the first voltage dividing circuit 11 negligible relative to the voltage dividing capability of the second voltage dividing circuit 12, that is, the voltage of the second voltage dividing circuit 12 may be approximately equal to the voltage Vm, for example, the voltage dividing capability of the second voltage dividing circuit 12 is 100 times or other times of the voltage dividing capability of the first voltage dividing circuit 11, so the voltage dividing capability of the first voltage dividing circuit may be negligible.
The charge storage circuit 13 is connected in parallel with the second voltage division circuit 12 and is used for storing energy for the second voltage division circuit 12; the first switch circuit 15 is connected in series between the discharge circuit 14 and the charge storage circuit 13, for discharging the charge storage circuit 13.
Specifically, one end of the second voltage dividing circuit 12 is connected to the first voltage dividing circuit 11, and the other end of the second voltage dividing circuit 12 is grounded. One end of the first switch circuit 15 is connected to the side of the port circuit 10 close to the port through the discharge circuit 14, the other end of the first switch circuit 15 is connected to the ground (the other end) of the second voltage divider circuit 12, and the first switch circuit 15 is controlled by the main control unit of the electronic device.
It should be noted that the voltage dividing capability of the second voltage dividing circuit 12 is much greater than the voltage dividing capability of the first voltage dividing circuit 11, so that the energy storage voltage of the charge storage circuit 13 can be ensured to be much greater than the divided voltage of the first voltage dividing circuit 11, and the voltage of the second voltage dividing circuit 12 is ensured to be close to Vm, so as to protect the battery and prevent the current of the battery from flowing backwards.
By using the bit detection circuit 100 connected to the port circuit 10, the main control unit of the electronic device can determine the bit information of the external device 20 according to the voltage of the second voltage division circuit 12 and/or the voltage of the second voltage division circuit 12 changed by the control discharge circuit 14.
Taking an electronic device as an example of a charger, after the charger is powered on, the control switch K1 of the port circuit 10 of the charger is in an off state and the front end thereof is connected with a voltage Vm, because the battery is not yet charged and the control switch K1 is in the off state, the first voltage dividing circuit 11 and the second voltage dividing circuit 12 divide the voltage Vm, the charge storage circuit 13 stores energy, and the voltage across the charge storage circuit 13 is the voltage across the second voltage dividing circuit 12, because the voltage dividing capability of the second voltage dividing circuit 12 is greater than that of the first voltage dividing circuit 11, for example, if the voltage across the charge storage circuit 13 is much greater than that of the first voltage dividing circuit 11, the voltage across the charge storage circuit 13 may be approximately Vm. Under the control of the main control unit of the charger, the first switch circuit 15 is turned on at a certain time (for example, 500ms), and since the first switch circuit 15 is turned on, the electric energy stored in the charge storage circuit 13 is discharged through the discharge circuit 14, so as to form a channel dropping voltage, the depth of the channel dropping voltage is determined by the length of the turn-on time of the first switch circuit 15, and if the turn-on time of the first switch circuit 15 is long enough, the voltage of the second voltage division circuit 12 is pulled to 0V, so as to form a square wave.
Specifically, as shown in fig. 4, the conduction time of the first switch circuit 15 is from t1 to t2, and at t1 to t2, the discharge circuit 14 discharges the electric energy stored in the charge storage circuit 13, so that the voltage has a channel drop phenomenon.
The determining the in-place information of the external device 20 specifically includes:
1) since the battery is connected in parallel to both ends of the charge storage circuit 13 at the time of battery insertion, the voltage of the second voltage dividing circuit 12 does not change regardless of whether the first switching circuit 15 is on or off. Therefore, when the voltage of the second voltage division circuit 12 detected by the main control unit of the charger does not change, the in-place information of the battery can be determined as "plugged in", which can also be referred to as "online".
2) When the voltage of the second voltage dividing circuit 12 is a preset voltage (for example, approximately Vm), the battery is fully charged or the battery is pulled out, the port circuit 10 is controlled to be disconnected through the main control unit of the charger to not charge the battery, the voltage of the second voltage dividing circuit 12 is detected again, if the detected voltage is not changed, the battery is fully charged, and if the detected voltage has a groove falling phenomenon, the in-place information of the battery is pulled out.
The utility model provides a detection circuitry in place can also confirm other information, for example "short circuit" and "battery saturation" etc. except can confirming the insertion of battery or extract etc. information in place. Specifically, the results are shown in Table 1.
TABLE 1 in-place information of the batteries
Therefore, the electronic equipment can quickly and accurately detect the presence information of the external equipment connected with the electronic equipment by using the presence detection circuit. Because the battery is not required to be charged through the first switch circuit, the MOS switch with high price and low on-resistance is not required to be used, and the cost of the circuit can be further reduced. Meanwhile, the on-site detection circuit can also determine the 'pulled-out' information of the battery, so that the on-site detection circuit is suitable for a multi-channel charger.
In some embodiments, as shown in fig. 5, the port circuit 10 includes a second switch circuit 16, and the second switch circuit 16 is controlled by a main control unit of the electronic device, that is, the main control unit controls the second switch circuit 16 to turn on and off, and controls charging or stopping charging the battery. The first voltage dividing circuit 11 is connected in parallel with the second switching circuit 16.
The second switch circuit 16 may be a switch circuit, or include a transistor, such as a MOS transistor or a triode.
Illustratively, as shown in fig. 6, in order to improve the safety of the circuit, the second switch circuit 16 includes a first fet Q11, a second fet Q12 and a third fet Q13, the first fet Q11 and the second fet Q12 are in butt joint, where the butt joint refers to that the drains of the fets are connected, the gates of the first fet Q11 and the second fet Q12 are both connected to the drain or the source of the third fet Q13, correspondingly, the source or the drain of the third fet is grounded, and the gate of the third fet Q13 is connected to the main control unit, and is configured to receive a control signal from the main control unit to implement the on or off of the second switch circuit 16.
In order to improve the safety of the circuit, as shown in fig. 6, the second switch circuit 16 further includes a resistor R11, a resistor R12, a resistor R13, and a resistor R14. The resistor R11 is connected between the drain and the gate of the first fet Q11, or the resistor R11 is connected between the drain and the gate of the second fet Q12. The resistor R12 is connected between the gate of the first fet Q11 and the drain of the third fet Q13. The gate of the third fet Q13 is connected to the main control unit via a resistor R13, and is configured to receive the Charge signal. The resistor R14 is connected between the gate and source of the third fet Q13. The second switch circuit 16 further includes a capacitor C11, and the capacitor C11 is connected in parallel with the resistor R11 for filtering protection.
In some embodiments, as shown in fig. 7, the first voltage divider circuit 11 includes at least one resistor, specifically the resistor R4 in fig. 5. Of course, a plurality of resistors may be included, and the plurality of resistors may be connected in series or in parallel. Of course, other voltage dividing components may be included.
In some embodiments, as shown in fig. 8, the first voltage divider 11 further includes a diode D1, the diode D1 is connected in series with the resistor R4 of the first voltage divider 11, and the conducting direction of the diode D1 is the same as the current flowing in the port circuit 10. The diode D1 prevents the current from flowing backwards, plays a role of protecting the circuit and further improves the safety of the circuit.
Specifically, as shown in fig. 8, the anode of the diode D1 is connected to the end (Vm input end) of the second switch circuit 16 far from the port, the cathode of the diode D2 is connected to the end of the resistor R4 of the first voltage-dividing circuit 11, and the other end of the resistor R4 of the first voltage-dividing circuit 11 is connected to the end of the second switch circuit 16 near the port.
In some embodiments, as shown in fig. 9, the charge storage circuit 13 includes at least one capacitor C1, and the capacitor C1 is connected in parallel with the second voltage divider 12 for storing energy in the second voltage divider 12. Of course, the charge storage circuit 13 may also include a plurality of capacitors or other energy storage elements, which is not limited herein.
In some embodiments, as shown in fig. 10, the second voltage divider circuit 12 includes at least two resistors, which are connected in series. Specifically, the resistor R5 and the resistor R6 are respectively, the resistor R5 and the resistor R6 are connected in series, one end of the resistor R5 is connected to the first voltage dividing circuit 11, specifically, for example, the resistor R4 is connected, and one end of the resistor R6 is grounded.
It should be noted that the voltage dividing capability of the second voltage dividing circuit 12 is greater than that of the first voltage dividing circuit 11, and can be specifically realized by selecting the resistances of the resistor R4, the resistor R5, and the resistor R6.
In some embodiments, as shown in fig. 10, the second voltage dividing circuit 12 includes a voltage detecting circuit 121, one end of the voltage detecting circuit 121 is connected between two resistors of the second voltage dividing circuit 12, and the other end of the voltage detecting circuit 121 is connected to the main control unit for detecting the voltage of the second voltage dividing circuit 12.
In some embodiments, as shown in fig. 11, in order to improve the detection accuracy of the voltage of the second voltage dividing circuit 12, the presence detection circuit 100 further includes a filter capacitor C2, one end of the filter capacitor C2 is connected to the voltage detection circuit 121, and the other end of the filter capacitor C2 is grounded to perform a filtering function.
In some embodiments, as shown in fig. 12, the first switch circuit 15 includes a fet Q2, one end (source or drain) of the fet Q2 of the first switch circuit 15 is connected to the discharge circuit 14, and the other end (drain or source) of the fet Q2 of the first switch circuit 15 is connected to the ground terminal of the second voltage divider circuit 12. Specifically, the gate of the fet Q2 receives a control signal from the main control unit through the resistor R8, and a resistor R9 is connected between the source and the gate of the fet Q2 to protect the fet Q2.
In some embodiments, as shown in fig. 13, the discharge circuit 14 includes at least one resistor R7, and the resistor R7 of the discharge circuit 14 is smaller than the resistance of the resistor of the second voltage divider circuit 12, such as smaller than the sum of the resistances of the resistors R5 and R6, or smaller than any one of the resistances of the resistors R5 and R6, so as to discharge the charge storage circuit 13.
In some embodiments, if the electronic device includes a plurality of port circuits, as shown in fig. 14, including a port circuit 1 and a port circuit 2. For example, the present information for detecting multiple batteries is a multi-channel (port circuit) charger. The reasonable charging can be carried out by detecting the battery on-position information of each channel, for example, the charging sequence and the charging state of a plurality of batteries are controlled, specifically, when the charging state is saturated, the switch on the channel is turned off and the battery is pulled out, so that the battery is overcharged, and the service life and the safety of the battery are further improved.
Please refer to fig. 15, fig. 15 is a schematic structural diagram of a charger according to an embodiment of the present invention. The charger uses the presence detection circuit provided by any one of the above embodiments to detect the presence information of the battery and charge the battery according to the presence information of the battery.
The charger comprises at least one port circuit, wherein the port circuit can be accessed to an external device, and the external device comprises a battery; the port circuit is further connected with an in-place detection circuit as described in any one of the above, and is used for detecting in-place information of the external device so as to charge the external device according to the in-place information.
Specifically, as shown in fig. 15, the charger 200 includes a plurality of charging compartments 201, each charging compartment 201 corresponding to a port circuit, and when a battery 202 is inserted into the charging compartment 201, the battery 202 is charged through the port circuit. Because each port circuit is also connected with an on-site detection circuit, the on-site information of each battery can be detected, and the battery can be charged according to the on-site information of the battery.
For example, when a battery is inserted, the battery is charged; when the battery is detected to be pulled out, a switch on the port circuit is closed to stop charging; or when a plurality of batteries are connected to the charger at the same time, charging is performed according to the in-place information of the batteries and the in-place information of the batteries.
Referring to fig. 16, fig. 16 is a schematic block diagram of a charger according to an embodiment of the present invention. As shown in fig. 16, the electronic device 300 includes a port circuit connected to a port provided on a housing of the electronic device, and specifically, as shown in fig. 16, the electronic device 300 includes four ports, i.e., a port 1, a port 2, a port 3, and a port 4, each of which is capable of accessing an external device including a battery. The port circuit is further connected with an in-place detection circuit for detecting in-place information of the external equipment.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (15)
1. An on-site detection circuit is characterized by being used for detecting whether an external device is connected to a port circuit of an electronic device, wherein the external device comprises a battery; the in-place detection circuit includes:
a first voltage divider circuit connected in parallel with the port circuit;
a second voltage divider circuit connected in series with the first voltage divider circuit;
a charge storage circuit connected in parallel with the second voltage divider circuit;
the first switch circuit is connected between the discharge circuit and the charge storage circuit in series and used for discharging the charge storage circuit;
the main control unit of the electronic device can determine the in-place information of the external device according to the voltage of the second voltage division circuit and/or control the discharge circuit to change the voltage of the second voltage division circuit.
2. The circuit of claim 1, wherein one end of the second voltage divider circuit is connected to the first voltage divider circuit, and the other end of the second voltage divider circuit is grounded;
one end of the first switch circuit is connected with the side, close to the port, of the port circuit through the discharge circuit, the other end of the first switch circuit is connected with the grounding end of the second voltage division circuit, and the first switch circuit is controlled by a main control unit of the electronic equipment.
3. The circuit of claim 1, wherein the port circuit comprises a second switch circuit controlled by a main control unit of the electronic device, and wherein the first voltage divider circuit is connected in parallel with the second switch circuit.
4. The circuit of claim 3, wherein the first voltage divider circuit comprises at least one resistor; and/or the second voltage division circuit comprises at least two resistors which are connected in series.
5. The circuit of claim 4, wherein the first voltage divider circuit further comprises a diode connected in series with a resistor of the first voltage divider circuit, and wherein the diode is turned on in the same direction as the current flowing through the port circuit when the port circuit is in operation.
6. The circuit of claim 5, wherein the anode of the diode is connected to one end of the second switch circuit far from the port, the cathode of the diode is connected to one end of the resistor of the first voltage divider circuit, and the other end of the resistor of the first voltage divider circuit is connected to one end of the second switch circuit near to the port.
7. The circuit of claim 4, wherein the second voltage divider circuit comprises a voltage detection circuit, one end of the voltage detection circuit is connected between two resistors of the second voltage divider circuit, and the other end of the voltage detection circuit is connected to the main control unit for detecting the voltage of the second voltage divider circuit.
8. The circuit of claim 7, wherein the presence detection circuit further comprises a filter capacitor, one end of the filter capacitor is connected to the voltage detection circuit, and the other end of the filter capacitor is grounded.
9. A circuit according to any one of claims 1 to 3, wherein the voltage dividing capability of the second voltage dividing circuit is greater than the voltage dividing capability of the first voltage dividing circuit.
10. A circuit as claimed in any one of claims 1 to 3, wherein the charge storage circuit comprises at least one capacitor.
11. The circuit of any one of claims 1 to 3, wherein the discharge circuit comprises at least one resistor, and wherein the resistor of the discharge circuit is smaller than the resistor of the second voltage divider circuit.
12. The circuit according to any one of claims 1 to 3, wherein the first switching circuit includes a field effect transistor, one end of the field effect transistor of the first switching circuit is connected to the discharge circuit, and the other end of the field effect transistor of the first switching circuit is connected to a ground terminal of the second voltage dividing circuit.
13. The circuit of claim 3, wherein the second switch circuit comprises a first field effect transistor, a second field effect transistor and a third field effect transistor, the first field effect transistor and the second field effect transistor are connected in a butt joint manner, gates of the first field effect transistor and the second field effect transistor are both connected with a drain or a source of the third field effect transistor, correspondingly, a source or a drain of the third field effect transistor is grounded, and a gate of the third field effect transistor is connected with the main control unit and used for receiving a control signal of the main control unit to realize the on or off of the second switch circuit.
14. A charger, characterized in that it comprises at least one port circuit, said port circuit being accessible to an external device, said external device comprising a battery; the port circuit is further connected with an in-place detection circuit as claimed in any one of claims 1 to 13, for detecting in-place information of the external device, so as to charge the external device according to the in-place information.
15. An electronic device, comprising a port circuit, wherein the port circuit can access an external device, wherein the port circuit is further connected with the presence detection circuit according to any one of claims 1 to 13, for detecting presence information of the external device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020659431.XU CN212781148U (en) | 2020-04-26 | 2020-04-26 | On-line detection circuit, charger and electronic equipment |
| PCT/CN2020/135463 WO2021218169A1 (en) | 2020-04-26 | 2020-12-10 | In-position detection circuit, charger and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020659431.XU CN212781148U (en) | 2020-04-26 | 2020-04-26 | On-line detection circuit, charger and electronic equipment |
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| Publication Number | Publication Date |
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| CN212781148U true CN212781148U (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020659431.XU Active CN212781148U (en) | 2020-04-26 | 2020-04-26 | On-line detection circuit, charger and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN212781148U (en) |
| WO (1) | WO2021218169A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137424A (en) * | 2021-11-29 | 2022-03-04 | 深圳市太美亚电子科技有限公司 | Battery power detection circuit |
| CN115021696B (en) * | 2022-08-02 | 2023-06-27 | 宁波中车时代传感技术有限公司 | Charge amplifier circuit and vibration sensor |
| CN116722631B (en) * | 2023-08-11 | 2024-03-22 | 深圳市高斯宝电气技术有限公司 | Wide voltage output charger interface circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10185968A (en) * | 1996-12-27 | 1998-07-14 | Sony Corp | Electric circuit for detecting voltage |
| JP4831113B2 (en) * | 2008-04-28 | 2011-12-07 | ブラザー工業株式会社 | Battery connection detecting device and image forming apparatus having the same |
| JP2014518058A (en) * | 2011-04-28 | 2014-07-24 | ゾール サーキュレイション インコーポレイテッド | System and method for automatically detecting battery insertion |
| CN202333903U (en) * | 2011-12-01 | 2012-07-11 | 德明通讯(上海)有限公司 | Circuit for battery insertion detection and temperature protection |
| CN203504217U (en) * | 2013-09-10 | 2014-03-26 | 向智勇 | Electronic cigarette case |
-
2020
- 2020-04-26 CN CN202020659431.XU patent/CN212781148U/en active Active
- 2020-12-10 WO PCT/CN2020/135463 patent/WO2021218169A1/en active Application Filing
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| WO2021218169A1 (en) | 2021-11-04 |
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