A load detection circuit
A load detection and circuit technology, applied in the field of circuits, can solve the problems of undetectable, high cost, and high leakage current, and achieve the effects of improving efficiency, good compatibility, and reducing leakage current
Active Publication Date: 2022-06-24
上海芯导电子科技股份有限公司
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Problems solved by technology
[0003] In the prior art, a power switch tube and two detection pins are needed to detect the standby state of the charging device, but the cost of this solution is high and large losses will be generated, thereby reducing the efficiency of the power supply system
In addition, the existing load detection scheme only detects through resistive loads. However, in actual situations, there are many types of mobile phones, and some mobile phones have high resistance. The existing technology cannot detect and has poor compatibility.
Moreover, the output voltage of the voltage output terminal is relatively high, resulting in a relatively high leakage current of the output voltage when the charging device is in standby mode.
Method used
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[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
[0029] It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.
[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.
[0031] The present invention provides a load detection circuit, which provides a ...
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The present invention relates to the field of circuit technology, in particular to a load detection circuit, which includes: a voltage source; a first switch connected in series between the voltage source and ground; The second switch is connected in series between the first switch and the ground, and a voltage output terminal is drawn between the first switch and the second switch; a comparison unit generates a control first switch according to a reference voltage and the output voltage of the voltage output terminal. The first conduction signal of the switch and the second conduction signal of the second switch are controlled so that the output voltage approaches the reference voltage. Beneficial effects: make the output voltage close to the reference voltage, which can effectively reduce the leakage current of the charging equipment in standby, thereby improving the efficiency of the power supply system, and can detect not only resistive loads but also capacitive loads, with better compatibility .
Description
technical field [0001] The present invention relates to the technical field of circuits, in particular to a load detection circuit. Background technique [0002] At present, there are more and more electronic devices on the market that require lithium battery charging compartments for charging management. Generally, in order to save power, the discharge circuit of the battery charging compartment is in a standby state when the device to be charged is not inserted, and the lower the voltage in the standby state, the lower the leakage current of the charging device in standby. [0003] In the prior art, one power switch tube and two detection pins are required to detect the standby state of the charging device. However, this solution is costly and will generate large losses, thereby reducing the efficiency of the power supply system. In addition, the existing load detection scheme only detects by resistive load. However, in practice, there are many types of mobile phones, and...
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IPC IPC(8): H02J7/00
CPCH02J7/007182H02J7/0047H02J7/0036
Inventor 邱星福符志岗冯伟平朱晓明欧新华袁琼陈敏戴维
Owner 上海芯导电子科技股份有限公司