CN213423314U - Line loss compensation-based charging power supply output current detection circuit - Google Patents
Line loss compensation-based charging power supply output current detection circuit Download PDFInfo
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- CN213423314U CN213423314U CN202022683200.5U CN202022683200U CN213423314U CN 213423314 U CN213423314 U CN 213423314U CN 202022683200 U CN202022683200 U CN 202022683200U CN 213423314 U CN213423314 U CN 213423314U
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Abstract
The utility model relates to a charging source output current detection circuitry based on line loss compensation, this circuit includes: digital bus: a digital signal for giving an output voltage set value; an output voltage control sub-circuit: the sub-circuit adjusts the current output to the output voltage feedback point of the charging power supply based on the line loss compensation according to the output voltage set value; actual output voltage detection subcircuit: the sub-circuit detects the actual output voltage of a voltage output port of the charging power supply based on line loss compensation; an output current calculating sub-circuit: the sub-circuit calculates line loss compensation voltage based on actual output voltage and an output voltage set value, and amplifies the line loss compensation voltage to obtain the output current of the charging power supply based on line loss compensation. Compared with the prior art, the utility model has the advantages of low cost, testing result are accurate.
Description
Technical Field
The utility model relates to a charger output current detection circuitry especially relates to a charging source output current detection circuitry based on line loss compensation.
Background
In recent years, fast charging is the fastest growing power conversion market at present, and the fast charging chip output keeps a high-speed annual composite growth rate of more than 50% from 2015 to 2019. As mainstream fast charging protocols (Quick Charge 3.0, FCP, SCP, AFC, VOOC, USB PD) are continuously upgraded, a lot of fast charging protocol solutions that appear fastest in the industry at present are basically implemented based on MCU; some fast charging protocol solutions are also implemented on asic. However, in addition to the application of the fast charging protocol, there are still a number of old standards on the market, most typically the apple's Divider standard and the BC1.2 standard, which present challenges to power distribution and management.
In order to solve the problem of power distribution and management, the current of an output port needs to be detected, and a very small current detection resistor is usually used, which puts a high requirement on the accuracy of an analog-to-digital converter of the MCU; although the asic can solve this problem, it requires a high-precision current operational amplifier and an analog-to-digital converter associated therewith, which increases the cost and chip complexity.
In summary, the prior art is difficult to realize the detection of the output current, the power management and distribution, and the cost advantage is maintained, thereby limiting the popularization and application thereof in the wide market.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a charger output current detection circuit based on line loss compensation in order to overcome the defect that above-mentioned prior art exists.
The purpose of the utility model can be realized through the following technical scheme:
a charging power supply output current detection circuit based on line loss compensation, the circuit comprising:
digital bus: a digital signal for giving an output voltage set value;
an output voltage control sub-circuit: the sub-circuit adjusts the current output to the output voltage feedback point of the charging power supply based on the line loss compensation according to the output voltage set value;
actual output voltage detection subcircuit: the sub-circuit detects the actual output voltage of a voltage output port of the charging power supply based on line loss compensation;
an output current calculating sub-circuit: the sub-circuit calculates line loss compensation voltage based on actual output voltage and an output voltage set value, and amplifies the line loss compensation voltage to obtain the output current of the charging power supply based on line loss compensation.
Preferably, the output voltage setting sub-circuit comprises two groups of accurate current sources controlled by a switch, namely a first current source group for injecting current to an output voltage feedback point of the charging power supply based on line loss compensation and a second current source group for extracting current to the ground potential from the output voltage feedback point of the charging power supply based on line loss compensation.
Preferably, the first current source group and the second current source group respectively comprise a plurality of current sources connected in parallel, and the current sources are connected to an output voltage feedback point of the charging power supply based on line loss compensation through a switching tube.
Preferably, the switching tube is an MOS tube.
Preferably, the number of current sources connected in parallel in each current source group is at least 4.
Preferably, the current sources connected in parallel in each current source group are current sources with different output current magnitudes.
Preferably, the actual output voltage detection sub-circuit comprises a filter circuit, an input end of the filter circuit is connected with a voltage output port of the charging power supply based on line loss compensation, and an output end of the filter circuit is connected to the output current calculation sub-circuit.
Preferably, the filter circuit is an RC filter circuit.
Preferably, the output current calculating sub-circuit comprises a digital-to-analog converter, an operational amplifier and an analog-to-digital converter, wherein the input end of the digital-to-analog converter is connected with the digital bus, the output end of the digital-to-analog converter is connected with the input cathode of the operational amplifier, the input anode of the operational amplifier is connected with the output end of the actual output voltage detecting sub-circuit, the output end of the operational amplifier is connected with the analog-to-digital converter, and the analog-to-digital converter outputs a digital signal of the output.
Preferably, the charging power supply based on line loss compensation is a switching power supply circuit based on line loss compensation.
Compared with the prior art, the utility model has the advantages of as follows:
(1) the utility model discloses charging source output current detection circuitry based on line loss compensation is integrated circuit, need not high accuracy analog-to-digital converter or high accuracy electric current operational amplifier and supporting analog-to-digital converter with it, realizes low cost, and the testing result is accurate;
(2) the utility model discloses output voltage control sub-circuit adopts the form that two sets of current source organized, realizes the electric current according to the accurate control output voltage feedback point of output voltage setting value to improve the accurate nature of the actual output voltage of the voltage output mouth based on the charging source of line loss compensation.
Drawings
Fig. 1 is the utility model discloses charging source output current detection circuitry's circuit structure schematic diagram based on line loss compensation.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Note that the following description of the embodiments is merely an example of the nature, and the present invention is not intended to limit the application or the use thereof, and the present invention is not limited to the following embodiments.
Examples
As shown in fig. 1, the line loss compensation based charging power supply output current detection circuit is a line loss compensation based switching power supply circuit, and the detection circuit is applicable to any line loss compensation based switching power supply circuit.
The charging power supply output current detection circuit based on line loss compensation comprises:
digital bus: a digital signal for giving an output voltage set value;
an output voltage control sub-circuit: the sub-circuit adjusts the current output to the output voltage feedback point of the charging power supply based on the line loss compensation according to the output voltage set value;
actual output voltage detection subcircuit: the sub-circuit detects the actual output voltage of a voltage output port of the charging power supply based on line loss compensation;
an output current calculating sub-circuit: the sub-circuit calculates line loss compensation voltage based on actual output voltage and an output voltage set value, and amplifies the line loss compensation voltage to obtain the output current of the charging power supply based on line loss compensation.
The output voltage setting sub-circuit comprises two groups of accurate current sources controlled by a switch, namely a first current source group for injecting current to an output voltage feedback point of the charging power supply based on line loss compensation and a second current source group for extracting current to the ground potential from the output voltage feedback point of the charging power supply based on line loss compensation.
The first current source group and the second current source group respectively comprise a plurality of current sources connected in parallel, the current sources are connected to an output voltage feedback point of the charging power supply based on line loss compensation through a switch tube, and the switch tube is an MOS tube.
The current sources connected in parallel in each current source group at least comprise 4 current sources, and the current sources connected in parallel in each current source group are current sources with different output current magnitudes. In this embodiment, each of the first current source group and the second current source group includes 4 parallel current sources, wherein the current sources in the first current source group have magnitudes of I1, 2 × I1, 4 × I1, and 8 × I1, and the current sources in the second current source group have magnitudes of 16 × I1, 32 × I1, 64 × I1, and 128 × I1, respectively.
The actual output voltage detection sub-circuit comprises a filter circuit, the input end of the filter circuit is connected with a voltage output port of the charging power supply based on line loss compensation, the output end of the filter circuit is connected to the output current calculation sub-circuit, and the filter circuit is an RC filter circuit.
The output current calculating sub-circuit comprises a digital-to-analog converter, an operational amplifier and an analog-to-digital converter, wherein the input end of the digital-to-analog converter is connected with a digital bus, the output end of the digital-to-analog converter is connected with the input cathode of the operational amplifier, the input anode of the operational amplifier is connected with the output end of the actual output voltage detecting sub-circuit, and the output end of the operational amplifier is connectedAnd the analog-to-digital converter outputs a digital signal based on the output current of the charging power supply with line loss compensation. Wherein, the amplification factor of the operational amplifier is N ═ IOUT/VLC，IOUTThe output current of the charging power supply based on the line loss compensation is large, the VLC is the line loss compensation voltage, the line loss compensation voltage is the difference value between the actual output voltage of the voltage output port of the charging power supply based on the line loss compensation and the set value of the output voltage, wherein N is preset, therefore, the I is passedOUTObtaining output current I of charging power supply based on line loss compensation according to N VLCOUTThe circuit can be realized by an operational amplifier, so that the output current I is obtainedOUTAnd then a digital signal of the output current of the charging power supply based on line loss compensation can be obtained through an analog-to-digital converter.
The utility model discloses charging source output current detection circuitry based on line loss compensation is integrated circuit, need not high accuracy analog to digital converter or high accuracy electric current operational amplifier and supporting analog to digital converter with it, realizes the low cost, and the testing result is accurate.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (10)
1. A charging power supply output current detection circuit based on line loss compensation is characterized by comprising:
digital bus: a digital signal for giving an output voltage set value;
an output voltage control sub-circuit: the sub-circuit adjusts the current output to the output voltage feedback point of the charging power supply based on the line loss compensation according to the output voltage set value;
actual output voltage detection subcircuit: the sub-circuit detects the actual output voltage of a voltage output port of the charging power supply based on line loss compensation;
an output current calculating sub-circuit: the sub-circuit calculates line loss compensation voltage based on actual output voltage and an output voltage set value, and amplifies the line loss compensation voltage to obtain the output current of the charging power supply based on line loss compensation.
2. The line loss compensation-based output current detection circuit for a charging power supply according to claim 1, wherein the output voltage setting sub-circuit comprises two sets of precise current sources controlled by a switch, a first current source set for injecting current to the output voltage feedback point of the line loss compensation-based charging power supply and a second current source set for drawing current from the output voltage feedback point of the line loss compensation-based charging power supply to the ground potential.
3. The line loss compensation-based output current detection circuit for a charging power supply according to claim 2, wherein the first current source set and the second current source set each comprise a plurality of parallel current sources respectively, and the current sources are connected to the output voltage feedback point of the line loss compensation-based charging power supply through a switching tube.
4. The line loss compensation-based charging power supply output current detection circuit as claimed in claim 3, wherein the switching tube is an MOS tube.
5. The line loss compensation-based charging power supply output current detection circuit as claimed in claim 3, wherein the number of the current sources connected in parallel in each current source group is at least 4.
6. The line loss compensation-based charging power supply output current detection circuit as claimed in claim 3, wherein the current sources connected in parallel in each current source group are current sources with different output current magnitudes.
7. The line loss compensation-based charging power supply output current detection circuit as claimed in claim 1, wherein the actual output voltage detection sub-circuit comprises a filter circuit, an input terminal of the filter circuit is connected to a voltage output port of the line loss compensation-based charging power supply, and an output terminal of the filter circuit is connected to the output current calculation sub-circuit.
8. The line loss compensation-based charging power supply output current detection circuit as claimed in claim 7, wherein the filter circuit is an RC filter circuit.
9. The line loss compensation-based output current detection circuit for a charging power supply according to claim 1, wherein the output current calculation sub-circuit comprises a digital-to-analog converter, an operational amplifier and an analog-to-digital converter, an input terminal of the digital-to-analog converter is connected to the digital bus, an output terminal of the digital-to-analog converter is connected to a negative input terminal of the operational amplifier, a positive input terminal of the operational amplifier is connected to an output terminal of the actual output voltage detection sub-circuit, an output terminal of the operational amplifier is connected to the analog-to-digital converter, and the analog-to-digital converter outputs a digital signal based on the magnitude.
10. The line loss compensation-based charging power supply output current detection circuit as claimed in claim 1, wherein the line loss compensation-based charging power supply is a line loss compensation-based switching power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022683200.5U CN213423314U (en) | 2020-11-18 | 2020-11-18 | Line loss compensation-based charging power supply output current detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022683200.5U CN213423314U (en) | 2020-11-18 | 2020-11-18 | Line loss compensation-based charging power supply output current detection circuit |
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| CN213423314U true CN213423314U (en) | 2021-06-11 |
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| CN202022683200.5U Active CN213423314U (en) | 2020-11-18 | 2020-11-18 | Line loss compensation-based charging power supply output current detection circuit |
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Effective date of registration: 20230703 Address after: 200233 No. 810, Xuhui District, Shanghai, Yishan Road Patentee after: SHANGHAI BELLING Corp.,Ltd. Address before: Room 15C, building 18, 810 Yishan Road, Xuhui District, Shanghai 200233 Patentee before: SHANGHAI LEADCHIP MICROELECTRONICS Corp.,Ltd. |
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