CN212321709U - Current detection circuit and electronic equipment - Google Patents
Current detection circuit and electronic equipment Download PDFInfo
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- CN212321709U CN212321709U CN202020556909.6U CN202020556909U CN212321709U CN 212321709 U CN212321709 U CN 212321709U CN 202020556909 U CN202020556909 U CN 202020556909U CN 212321709 U CN212321709 U CN 212321709U
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Abstract
The embodiment of the utility model discloses current detection circuit and electronic equipment. The current detection circuit comprises a first device, a voltage sampling device, a signal amplification module and a control module; the first end of the voltage sampling device is electrically connected with the first input end of the signal amplification module, and the second end of the voltage sampling device is electrically connected with the second input end of the signal amplification module; the control module is provided with a first terminal and a second terminal, the output end of the signal amplification module is electrically connected with the first terminal, and the enable end of the signal amplification module is electrically connected with the second terminal; the control module determines the current passing through the first device through the signal amplification module and the voltage sampling device. Utilize the embodiment of the utility model provides a can solve the problem of unable real time monitoring electronic equipment's charging current among the prior art.
Description
Technical Field
The embodiment of the utility model provides a relate to current detection technical field, especially relate to a current detection circuit and electronic equipment.
Background
Along with popularization and development of electronic equipment such as smart phones and tablet computers, more and more electronic equipment all possess the function of charging to the outside to satisfy user's growing convenience demand.
At present, in the process of external charging of electronic equipment, the charging current of the electronic equipment cannot be monitored in real time, so that the electronic equipment cannot accurately control charging parameters, and the reliability of external charging is reduced.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a current detection circuit and electronic equipment to solve the problem of the charging current of unable real time monitoring electronic equipment among the prior art.
In order to solve the technical problem, the utility model discloses a realize like this:
in a first aspect, an embodiment of the present invention provides a current detection circuit, which is applied to an electronic device and includes a first device, a voltage sampling device, a signal amplification module, and a control module;
the first end of the voltage sampling device is electrically connected with the first device and the first input end of the signal amplification module respectively, and the second end of the voltage sampling device is electrically connected with the second input end of the signal amplification module;
the control module is provided with a first terminal and a second terminal, the output end of the signal amplification module is electrically connected with the first terminal, and the enable end of the signal amplification module is electrically connected with the second terminal;
the control module determines the current passing through the first device through the signal amplification module and the voltage sampling device.
In a second aspect, an embodiment of the present invention provides an electronic device, including the current detection circuit of the first aspect.
The embodiment of the utility model provides an in, the control module group can confirm the electric current through first device through the voltage sampling device of being connected with first device and the signal amplification module that is used for gathering the voltage drop at voltage sampling device both ends and enlargies this voltage drop to can realize the real time monitoring to electronic equipment's charging current, and then make electronic equipment can carry out accurate control to charging parameter according to real time monitoring's charging circuit, improve the reliability that electronic equipment charges.
Drawings
The invention will be better understood from the following description of specific embodiments thereof, taken together with the accompanying drawings. Wherein like or similar reference numerals refer to like or similar features.
Fig. 1 is a schematic structural diagram of a current detection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a current detection circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a current detection circuit according to another embodiment of the present invention;
fig. 4 is a circuit diagram of a current detection circuit according to another embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware structure of an electronic device for implementing various embodiments 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 efforts belong to the protection scope of the present invention.
Along with popularization and development of electronic equipment such as smart phones and tablet computers, more and more electronic equipment all possess the function of charging to the outside to satisfy user's growing convenience demand.
At present, in the process of external charging of electronic equipment, the charging current of the external charging cannot be monitored in real time according to an application scene, an ambient temperature, a mainboard temperature and a battery temperature, so that the electronic equipment cannot accurately control charging parameters, and further the problem of inaccurate control of the external charging is caused, and the reliability of the external charging is reduced.
In order to solve the above problem in the prior art, the embodiment of the utility model provides a current detection circuit and electronic equipment. Next, the current detection circuit provided by the present invention will be described in detail.
Fig. 1 shows a schematic structural diagram of a current detection circuit according to an embodiment of the present invention.
In some embodiments of the present invention, the current detection circuit shown in fig. 1 may be disposed in the electronic device, for detecting the charging current of the external charging circuit of the electronic device. The electronic device may include, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.
As shown in fig. 1, the current detection circuit may include a first device 110, a voltage sampling device 120, a signal amplification module 130, and a control module 140.
A first terminal of the voltage sampling device 120 is electrically connected to the first device 110 and a first input terminal of the signal amplification module 130, respectively, and a second terminal of the voltage sampling device 120 is electrically connected to a second input terminal of the signal amplification module 130. The control module 140 has a first terminal and a second terminal, the output terminal of the signal amplification module 130 is electrically connected to the first terminal, and the enable terminal of the signal amplification module 130 is electrically connected to the second terminal.
Wherein the control module 140 determines the current passing through the first device 110 through the signal amplifying module 130 and the voltage sampling device 120.
The embodiment of the utility model provides an in, control module 140 can confirm the electric current through first device 110 through voltage sampling device 120 and the signal amplification module 130 that is used for gathering the pressure drop at voltage sampling device 120 both ends and enlargies this pressure drop be connected with first device 110 to can realize the real time monitoring to the charging current of electronic equipment, and then make electronic equipment can carry out accurate control to charging parameter according to real time monitoring's charging circuit, improve the reliability that electronic equipment charges.
In some embodiments of the present invention, the first terminal of the control module 140 may be a voltage signal input terminal, and the second terminal of the control module 140 may be an enable signal output terminal.
In some embodiments of the present invention, the control module 140 may include an Analog-to-Digital Converter (ADC) detection module and a control module. The signal input terminal of the ADC detection module may be used as the first terminal of the control module 140, the signal input terminal of the ADC detection module is electrically connected to the output end of the signal amplification module and is used for detecting the voltage value of the output signal of the output end of the signal amplification module 130, and the control module is used for calculating the current passing through the first device 110 according to the voltage value detected by the ADC detection module, the amplification factor of the signal amplification module 130, and the resistance value of the voltage sampling device 120.
In some embodiments, the ADC detection module may be an ADC chip integrated in a Power Management Integrated Circuit (PMIC) of the electronic device, and accordingly, the control module may be a Power Management chip integrated in the PMIC.
In other embodiments, the ADC detection module may also be an ADC chip integrated in a Central Processing Unit (CPU) of the electronic device, and correspondingly, the control module may be a control chip integrated in the CPU.
It should be noted that the ADC detection module may be an ADC chip of any type, and is not limited herein.
The embodiment of the present invention provides an embodiment, the signal amplification module 130 can amplify the voltage drop at both ends of the voltage sampling device 120 into the output signal, and make the voltage value of the output signal be in the input voltage range of the ADC chip, so that the ADC chip can detect the voltage value of the output signal, and then make the control module calculate the current passing through the first device 110 based on the voltage value detected by the ADC detection unit. Therefore, in the embodiment of the utility model provides an in, electronic equipment can realize the real time monitoring to electronic equipment's charging current.
In some embodiments of the present invention, the control module 140 can also control the operation state of the signal amplification module 130 through the second terminal, i.e. the signal output terminal. Specifically, the control module 140 may output an enable signal to an enable terminal of the signal amplification module 130 when the external charging is performed, so as to start the signal amplification module 130; the control module 140 may also stop the operation of the signal amplification module 130 by not outputting the enable signal to the enable terminal of the signal amplification module 130 when external charging is not performed.
Therefore, the control module 140 can enable the signal amplification module 130 to be in a non-working state when the electronic device is not externally charged, thereby reducing the power consumption of the electronic device.
In some embodiments of the present invention, the first device 110 may include a charging interface. The charging interface may be a Universal Serial Bus (USB) interface in various forms, which is not limited herein. The charging interface has a charging terminal for transmitting a charging current, which can be connected to a charging line.
In some embodiments of the present invention, the charging wire may include a power line, i.e., a VBUS line, for transmitting a charging current from the electronic device to the external device. The charging terminal may include a power terminal, wherein one end of the power line is connected with the power terminal of the charging interface, and the other end of the power line is connected with a battery of the electronic device.
In these embodiments, the voltage sampling device 120 may optionally include a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) (hereinafter referred to as MOS Transistor) or a precision resistor. The precise resistor can be a milliohm-level precise resistor, and the MOS tube can be an anti-contrast MOS tube or an overvoltage protection MOS tube.
Since the MOS transistor is fully turned on when operating, and operates in the variable resistance region, at this time, the gate and source voltages of the MOS transistor are both fixed, and the drain to source of the MOS transistor is equivalent to a fixed resistance, i.e., an on-resistance, the on-resistance of the MOS transistor can be used as the voltage sampling device 120.
However, since the on-resistances of the MOS transistors have a uniformity difference, in order to calibrate the on-resistances of the MOS transistors, an on-resistance test station may be added during a production test of a product. In the process of charging the programmable power supply by the electronic equipment, the charging current value can be read by the programmable power supply, the charging current value can be calculated by the control module 140, and at the moment, the on-resistance of the MOS tube can be inversely calculated according to the charging current value read by the programmable power supply and the charging current value read by the control module 140.
Therefore, the embodiment of the present invention provides a smaller resistance of the voltage sampling device 120, which can effectively avoid the influence of the voltage sampling device 120 on the charging voltage.
In some embodiments of the present invention, when the voltage sampling device 120 is connected in series to the power line, that is, the first end of the voltage sampling device 120 is connected to the power terminal of the charging interface, the second end of the voltage sampling device 120 and the second input end of the signal amplification module 130 are respectively connected to the battery of the electronic device.
In other embodiments of the present invention, the charging wire may further include a ground wire, i.e., a GND wire. The charging terminal may include a ground terminal, wherein one end of the ground line is connected to the ground terminal of the charging interface, and the other end of the ground line is connected to a ground of the electronic device.
In these embodiments, the voltage sampling device 120 may optionally include a precision resistor. The precision resistor can be a milliohm precision resistor.
Therefore, the embodiment of the present invention provides a smaller resistance of the voltage sampling device 120, which can effectively avoid the influence of the voltage sampling device 120 on the charging voltage.
In some embodiments of the present invention, when the voltage sampling device 120 is connected in series to the ground line, i.e. the first end of the voltage sampling device 120 is connected to the ground terminal of the charging interface, the second end of the voltage sampling device 120 and the second input end of the signal amplification module 130 are grounded respectively.
In some embodiments of the present invention, in the case that the voltage sampling device 120 is connected in series to the ground wire, the signal amplification module 130 may only include a differential amplification module, a first input end of the differential amplification module is electrically connected to a first end of the voltage sampling device 120, a second input end of the differential amplification module is electrically connected to a second end of the voltage sampling device 120, an output end of the differential amplification module is electrically connected to a first terminal, and an enable end of the differential amplification module is electrically connected to a second terminal.
In these embodiments, the differential amplification module may optionally include an operational amplifier, which may be any common type of operational amplifier.
In these embodiments, optionally, the reference voltage of the signal amplification module, that is, the reference voltage of the operational amplifier of the differential amplification module, may be a preset bias voltage or a ground.
In some embodiments of the present invention, under the condition that the voltage sampling device 120 is connected in series to the power line, the signal amplification module 130 may only include a differential amplification module, a first input end of the differential amplification module is electrically connected to a first end of the voltage sampling device 120, a second input end of the differential amplification module is electrically connected to a second end of the voltage sampling device 120, an output end of the differential amplification module is electrically connected to a first terminal, and an enable end of the differential amplification module is electrically connected to a second terminal.
In these embodiments, the signal amplifying module 130 is a one-stage signal amplifying module, and optionally, the differential amplifying module may include an operational amplifier, which may be any common type of operational amplifier.
In these embodiments, optionally, the reference voltage of the signal amplification module, that is, the reference voltage of the operational amplifier of the differential amplification module, may be a preset bias voltage or a ground.
In other embodiments of the present invention, the signal amplification module 130 can further include a voltage amplification module besides the differential amplification module, the first input terminal of the voltage amplification module is electrically connected to the output terminal of the differential amplification module, the second input terminal of the voltage amplification module is grounded, the output terminal of the voltage amplification module is electrically connected to the first terminal, and the enable terminal of the voltage amplification module is electrically connected to the second terminal.
In these embodiments, the signal amplifying module 130 is a two-stage signal amplifying module, and optionally, the voltage amplifying module may include an operational amplifier, which may be any common type of operational amplifier.
In these embodiments, optionally, the reference voltage of the signal amplification module, i.e. the reference voltage of the operational amplifier of the differential amplification module, may be a ground pole.
Therefore, in the embodiment of the present invention, the voltage drop at both ends of the voltage sampling device 120 can be further amplified by the voltage amplifying module, so that the ADC detecting unit has higher sensitivity to the amplified voltage, and further the current passing through the first device 110 can be more accurately detected.
In the utility model discloses in some still embodiments, signal amplification module 130 also can only include the rail to the rail amplification module, and the first input of rail to the rail amplification module is connected with the first end electricity of voltage sampling device 120, and the second input of rail to the rail amplification module is connected with the second end electricity of voltage sampling device 120, and the output of rail to the rail amplification module is connected with first terminal electricity, and the enable end and the second terminal electricity of rail to the rail amplification module are connected.
In these embodiments, the signal amplifying module 130 is a primary signal amplifying module, and optionally, the rail-to-rail amplifying module may include a rail-to-rail operational amplifier.
The rail-to-rail operational amplifier has higher sensitivity and can accurately and reliably acquire the voltage drop at the two ends of the voltage sampling device 120 under the condition that the two ends of the voltage sampling device 120 are close to the power supply voltage of the battery at the same time.
In these embodiments, optionally, the reference voltage of the signal amplification module, i.e., the reference voltage of the rail-to-rail operational amplifier of the rail-to-rail amplification module, may be a preset bias voltage or a ground.
It should be noted that the current detection circuit shown in fig. 1 may also be used to detect a charging current of an internal charging circuit of an electronic device, which is not described herein again.
The charging circuit provided by the embodiment of the present invention will be described in detail based on the specific circuit structure of four charging circuits.
Fig. 2 shows a circuit diagram of a current detection circuit according to an embodiment of the present invention. As shown in FIG. 2, the current sensing circuit includes a VBUS line, a milliohm-scale precision resistor Rsns, an operational amplifier U1, and an operational amplifier U2.
The VBUS _ OUT end of the VBUS line is connected to a charging interface (not shown), the other end of the VBUS line is connected to a battery (not shown), and a milliohm-level precision resistor Rsns is connected in series to the VBUS line.
The operational amplifier U1 may be a normal type operational amplifier, the + IN terminal of the operational amplifier U1 is connected to one end of the milliohm-level precision resistor Rsns near the battery through a resistor R2, and the + IN terminal of the operational amplifier U1 is also connected to the reference voltage VREF through a resistor R4. the-IN end of the operational amplifier U1 is connected with one end of a milliohm-level precision resistor Rsns close to a charging interface through a resistor R1, the-IN end of the operational amplifier U1 is also connected with a reference voltage VREF through a resistor R3, the-IN end of the operational amplifier U1 is also connected with the OUT end of the operational amplifier U1 through a resistor Rf, and the voltage at the connection point is Vout 1. The VCC end of the operational amplifier U1 is connected to the supply voltage VCC, and the VSS end of the operational amplifier U1 is grounded. Wherein, the reference voltage VREF is the ground.
The operational amplifier U2 may be a normal type operational amplifier, the + IN terminal of the operational amplifier U2 is connected to the OUT terminal of the operational amplifier U1 through a resistor R5, the-IN terminal of the operational amplifier U1 is grounded through a resistor R6, the-IN terminal of the operational amplifier U1 is further connected to the OUT terminal of the operational amplifier U1 through a resistor R7, and the OUT terminal of the operational amplifier U1 is further connected to an ADC detection module of a control module (not shown IN the figure).
The enable signal output end of the control module is also respectively connected with the EN end of the operational amplifier U1 and the EN end of the operational amplifier U2.
Specifically, if the resistance to which the operational amplifier U1 is connected satisfies:
the voltage Vout1 and the current I output by the charging interfaceoutThe relationship of (1) is:
therefore, the operational amplifier U1 can adapt to a high common mode input voltage, and can realize a function of amplifying a differential signal.
Meanwhile, the voltage amplification factor of the operational amplifier U2 is:
in other embodiments of the present invention, the current detection circuit may further include VBUS line, milliohm-level precision resistor Rsns, operational amplifier U1 and related resistor connected to the operational amplifier U1, and the OUT terminal of the operational amplifier U1 may be directly connected to the ADC detection module of the control module. The reference voltage VREF is a preset bias voltage or a ground.
Fig. 3 shows a circuit diagram of a current detection circuit according to another embodiment of the present invention. As shown in fig. 3, the current detection circuit includes VBUS line, milliohm-level precision resistor Rsns, and operational amplifier U1.
The VBUS _ OUT end of the VBUS line is connected to a charging interface (not shown), the other end of the VBUS line is connected to a battery (not shown), and a milliohm-level precision resistor Rsns is connected in series to the VBUS line.
The operational amplifier U1 may be a rail-to-rail operational amplifier, the + IN terminal of the operational amplifier U1 is connected to one end of the milliohm precision resistor Rsns near the battery through a resistor R2, and the + IN terminal of the operational amplifier U1 is also connected to the reference voltage VREF through a resistor R3. the-IN terminal of the operational amplifier U1 is connected to one end of the milliohm precision resistor Rsns close to the charging interface through a resistor R1, and the-IN terminal of the operational amplifier U1 is also connected to the OUT terminal of the operational amplifier U1 through a resistor Rf. The OUT end of the operational amplifier U1 is connected with an ADC detection module of the control module. The VCC terminal of the operational amplifier U1 is connected to the VBUS line, and the VSS terminal of the operational amplifier U1 is grounded. The reference voltage VREF is a bias voltage or a ground.
The enable signal output end of the control module is also connected with the EN end of the operational amplifier U1.
Specifically, if the resistance to which the operational amplifier U1 is connected satisfies:
output voltage VOUT _ ADC and charging interface output of operational amplifier U1Current of (I)outThe relationship of (1) is:
fig. 4 shows a circuit diagram of a current detection circuit according to another embodiment of the present invention. As shown in fig. 4, the current detection circuit includes a VBUS line, a milliohm-level precision resistor Rsns, and an operational amplifier U1.
The VBUS _ OUT terminal of the VBUS line is connected to a charging interface (not shown), and the other end of the VBUS line is connected to a battery (not shown). One end of the milliohm-level precision resistor Rsns is connected with the charging interface, and the other end of the milliohm-level precision resistor Rsns is grounded.
The operational amplifier U1 may be a normal type operational amplifier, the + IN terminal of the operational amplifier U1 is connected to one end of the milliohm-level precision resistor Rsns close to the charging interface through a resistor R2, and the + IN terminal of the operational amplifier U1 is also connected to the reference voltage VREF through a resistor R3. the-IN terminal of the operational amplifier U1 is connected to the end of the milliohm-level precision resistor Rsns near the battery through a resistor R1, and the-IN terminal of the operational amplifier U1 is also connected to the OUT terminal of the operational amplifier U1 through a resistor Rf. The VCC end of the operational amplifier U1 is connected to the supply voltage VCC, and the VSS end of the operational amplifier U1 is grounded. The OUT end of the operational amplifier U1 is connected with an ADC detection module of the control module. The reference voltage VREF is a bias voltage or a ground.
The enable signal output end of the control module is also connected with the EN end of the operational amplifier U1.
Specifically, if the resistance to which the operational amplifier U1 is connected satisfies:
output voltage VOUT _ ADC of operational amplifier U1 and current I output by charging interfaceoutThe relationship of (1) is:
the embodiment of the utility model provides a still provide an electronic equipment, this electronic equipment includes the current detection circuit in the above-mentioned embodiment.
It should be noted that the embodiment of the present invention provides a current detection circuit in an electronic device, which has a similar structure and principle to those of the current detection circuit in the embodiment shown in fig. 1 to 4, and can realize the same functions and effects, and is not repeated here to avoid repetition.
Fig. 5 is a schematic diagram of a hardware structure of an electronic device for implementing various embodiments of the present invention.
As shown in fig. 5, the electronic device 200 includes, but is not limited to: radio frequency unit 201, network module 202, audio output unit 203, input unit 204, sensor 205, display unit 206, user input unit 207, interface unit 208, memory 209, processor 210, and power supply 211. Those skilled in the art will appreciate that the electronic device configuration shown in fig. 5 does not constitute a limitation of the electronic device, and that the electronic device may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the electronic device includes but is not limited to a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, and a pedometer.
The electronic device 200 may further include a current detection circuit (not shown in the figure), and the current detection circuit may include a first device, a voltage sampling device, a signal amplification module, and a control module.
The first end of the voltage sampling device is electrically connected with the first device and the first input end of the signal amplification module respectively, and the second end of the voltage sampling device is electrically connected with the second input end of the signal amplification module. The control module is provided with a first terminal and a second terminal, the output end of the signal amplification module is electrically connected with the first terminal, and the enable end of the signal amplification module is electrically connected with the second terminal.
The control module determines the current passing through the first device through the signal amplification module and the voltage sampling device.
The embodiment of the utility model provides an in, the control module group can confirm the electric current through first device through the voltage sampling device of being connected with first device and the signal amplification module that is used for gathering the voltage drop at voltage sampling device both ends and enlargies this voltage drop to can realize the real time monitoring to electronic equipment's charging current, and then make electronic equipment can carry out accurate control to charging parameter according to real time monitoring's charging circuit, improve the reliability that electronic equipment charges. The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.
Claims (10)
1. A current detection circuit is applied to electronic equipment and is characterized by comprising a first device, a voltage sampling device, a signal amplification module and a control module;
the first end of the voltage sampling device is electrically connected with the first device and the first input end of the signal amplification module respectively, and the second end of the voltage sampling device is electrically connected with the second input end of the signal amplification module;
the control module is provided with a first terminal and a second terminal, the output end of the signal amplification module is electrically connected with the first terminal, and the enable end of the signal amplification module is electrically connected with the second terminal;
wherein the control module determines a current through the first device through the signal amplification module and the voltage sampling device.
2. The current sensing circuit of claim 1, wherein the second terminal of the voltage sampling device is coupled to ground.
3. The current sensing circuit of claim 1, wherein the second terminal of the voltage sampling device is coupled to a battery of the electronic device.
4. The current detection circuit of claim 3, wherein the signal amplification module comprises a differential amplification module, a first input terminal of the differential amplification module is electrically connected to the first terminal of the voltage sampling device, a second input terminal of the differential amplification module is electrically connected to the second terminal of the voltage sampling device, an output terminal of the differential amplification module is electrically connected to the first terminal, and an enable terminal of the differential amplification module is electrically connected to the second terminal.
5. The current detection circuit of claim 4, wherein the signal amplification module further comprises a voltage amplification module, a first input terminal of the voltage amplification module is electrically connected to the output terminal of the differential amplification module, a second input terminal of the voltage amplification module is grounded, an output terminal of the voltage amplification module is electrically connected to the first terminal, and an enable terminal of the voltage amplification module is electrically connected to the second terminal.
6. The current sensing circuit of claim 3, wherein the signal amplification module comprises a rail-to-rail amplification module, a first input of the rail-to-rail amplification module is electrically connected to the first terminal of the voltage sampling device, a second input of the rail-to-rail amplification module is electrically connected to the second terminal of the voltage sampling device, an output of the rail-to-rail amplification module is electrically connected to the first terminal, and an enable of the rail-to-rail amplification module is electrically connected to the second terminal.
7. The current detection circuit according to claim 4 or 6, wherein the reference voltage of the signal amplification module is a preset bias voltage or a ground.
8. The current sensing circuit of claim 1, wherein the voltage sampling device is a precision resistor or a field effect MOS transistor.
9. The current sensing circuit of claim 1, wherein the first device comprises a charging interface.
10. An electronic device characterized by comprising the current detection circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020556909.6U CN212321709U (en) | 2020-04-15 | 2020-04-15 | Current detection circuit and electronic equipment |
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| CN202020556909.6U CN212321709U (en) | 2020-04-15 | 2020-04-15 | Current detection circuit and electronic equipment |
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| CN212321709U true CN212321709U (en) | 2021-01-08 |
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