CN203445784U - Power supply circuit having line loss compensation function - Google Patents
Power supply circuit having line loss compensation function Download PDFInfo
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- CN203445784U CN203445784U CN201320608038.8U CN201320608038U CN203445784U CN 203445784 U CN203445784 U CN 203445784U CN 201320608038 U CN201320608038 U CN 201320608038U CN 203445784 U CN203445784 U CN 203445784U
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Abstract
The utility model relates to a power supply circuit having a line loss compensation function. The power supply circuit comprises a resistor R1 and a resistor R2 that are connected in series between an output terminal and a ground, a node TFB disposed between the resistor R1 and the resistor R2, a current sampling resistor Rs connected in series between an input port and the output terminal, and an operational amplifier voltage-current conversion circuit being disposed between an input terminal and a load output terminal and having a compensation function, wherein the operational amplifier voltage-current conversion circuit consists of a subtractor and a constant current source. Compared with the prior art, the power supply circuit having the line loss compensation function is capable of real-time adjustment of a feedback network of the power supply output terminal to achieve the output voltage line loss compensation effect, so that an in-car entertainment system with an over long USB harness and too great line loss can still meet the USB specification. In addition, the compensation resistance Rc in the power supply circuit provided by the utility model can be adjusted according to an actual circuit, and is high in both practicality and applicability.
Description
Technical field
The utility model relates to a kind of power circuit, specifically a kind of power circuit with line loss compensation function.
Background technology
Because the technology of USB interface is comparatively ripe, easy to use, in vehicle entertainment system, gradually as standard configuration, occur.According to USB2.0 standard, the supply voltage of USB port needs to meet 5V ± 5%, i.e. 4.75-5.25V under 0-500mA loading condition.If this entertainment systems is supported iPod function, standard will be stricter, and according to the MFI agreement of Apple, the supply voltage of USB port needs to meet 4.75-5.25V under 0-1A loading condition.
Due to the design restriction of protrusion in car, the shape-designing of control in also having, generally vehicle-mounted USB interface can extend in copilot storage tank or in central storage tank by wire harness.The D.C. resistance Rt that supposes wire harness is 0.4 Ω, and when flowing through 1A electric current, pressure drop is Vdrop=Iout*Rt=1*0.4=0.4V.If USB supply voltage is set to 5.2V, now, by after USB wire harness, add the contact resistance between connector, be just difficult to guarantee that the lower limit that load lower port voltage at 1A meets 4.75V has required.
Fig. 1 is not for having the conspectus of line loss compensation function, in figure, adopt adjustable stabilized voltage supply to form power circuit, the magnitude of voltage that output is set is Vout1, and the magnitude of voltage of node TFB is VFB, wire harness resistance R t is divided into resistance R t1 and the resistance R t2 that is connected to load resistance RL both sides,
.
When this power circuit is powered as USB port, have
（1）
Because the magnitude of voltage Vdrop of loss on wire harness equals the product of output current Iout and wire harness resistance R t,
Now, the load voltage value Vload on load resistance RL is
When output current Iout remains unchanged, if wire harness resistance R t is excessive, load voltage value Vload can become very little, thereby lost, the voltage stabilizing of output is controlled.
In order to overcome the unsettled problem of output voltage that harness excess-length causes in vehicle environment, on original circuit base, increase the variation that a kind of line loss compensation circuit compensates the output voltage that Iout causes, thereby realize the output voltage regulation result within the scope of goal-selling value.
Summary of the invention
For above-mentioned prior art, the technical problems to be solved in the utility model is: a kind of power circuit with line loss compensation function is provided, and the mode by compensation, realizes the output of load voltage value within the scope of goal-selling value.
In order to address the above problem, the power circuit with line loss compensation function of the present utility model comprises resistance R 1 and the resistance R 2 being connected between output and ground, between resistance R 1 and resistance R 2, node TFB is set, be connected on the current sampling resistor Rs between input port and output, and between input and load output and the amplifier voltage-current converter circuit of redeeming.
Preferably, described amplifier voltage-current converter circuit comprises the subtracter being connected with current sampling resistor Rs, and the comparator U2 being connected with subtracter is connected on the switch element Q1 between node TFB and compensating resistance Rc, and compensating resistance Rc; The output of described subtracter is connected with the in-phase input end of comparator U2 by resistance R 11, the output of described comparator U2 is connected with the control end of switch element Q1, and the inverting input of described comparator U2 is connected to the node between switch element Q1 and compensating resistance Rc.
Preferably, described switch element Q1 is metal-oxide-semiconductor, and described compensating resistance Rc is connected with the source electrode of metal-oxide-semiconductor, and the output of described comparator U2 is connected with the grid of metal-oxide-semiconductor.
Preferably, described subtracter is to utilize differential type circuit to realize subtraction, and the circuit of realizing of described subtracter comprises integrated transporting discharging U1 and four or more resistance.
The power circuit preferably, with line loss compensation function also comprises the potential-divider network being connected between current sampling resistor Rs and pressure reducer.
Preferably, described potential-divider network comprises four resistance, and resistance R 5 accesses the node between input and current sampling resistor Rs, other end ground connection after connecting with resistance R 6; Resistance R 3 accesses the node between current sampling resistor Rs and output, other end ground connection after connecting with resistance R 4; The in-phase input end of described subtracter is connected to the node between resistance R 5 and resistance R 6, and its anti-phase input is connected to the node between resistance R 3 and resistance R 4.
Preferably, described comparator U2 is integrated transporting discharging, and the integrated transporting discharging in described circuit is powered by output voltage V out.
Compared with prior art, the utility model has increased current sampling resistor Rs and amplifier voltage-current converter circuit, feedback network to power output end is adjusted in real time, to reach the line loss compensation effect of output voltage, make vehicle entertainment system still can meet USB standard because USB harness excess-length line loss is excessive.In addition, the compensating resistance Rc in the circuit that the utility model is implemented can adjust according to side circuit, and practicality and applicability have both.
Accompanying drawing explanation
Fig. 1 is not for having the power circuit schematic diagram of line loss compensation function.
Fig. 2 is the power circuit schematic diagram with line loss compensation function that the utility model is implemented.
Embodiment
In order to allow those skilled in the art understand better the technical solution of the utility model, below in conjunction with accompanying drawing, the utility model is further elaborated.
Embodiment of the present utility model as shown in Figure 2, a kind of power circuit with line loss compensation function, comprise the resistance R 1 and the resistance R 2 that are connected between output and ground, between resistance R 1 and resistance R 2, node TFB is set, be connected on the current sampling resistor Rs between input port and output, and between input and load output and the amplifier voltage-current converter circuit A of redeeming.
Wherein, amplifier voltage-current converter circuit A comprises the subtracter being connected with current sampling resistor Rs, and the comparator U2 being connected with subtracter is connected on the switch element Q1 between node TFB and compensating resistance Rc, and compensating resistance Rc; The output of subtracter is connected with the in-phase input end of comparator U2 by resistance R 11, and the output of comparator U2 is connected with the control end of switch element Q1, and the inverting input of comparator U2 is connected to the node between switch element Q1 and compensating resistance Rc.
In figure, switch element Q1 is metal-oxide-semiconductor, and compensating resistance Rc is connected with the source electrode of metal-oxide-semiconductor, and the output of comparator U2 is connected with the grid of metal-oxide-semiconductor.Comparator U2 is integrated transporting discharging, and the integrated transporting discharging in circuit is powered by output voltage V out.Subtracter is to utilize differential type circuit to realize subtraction, and the circuit of realizing of subtracter comprises integrated transporting discharging U1 and four resistance, is respectively resistance R 7, resistance R 8, resistance R 9, resistance R 10.
In the present embodiment, also comprise the potential-divider network B being connected between current sampling resistor Rs and pressure reducer.
Wherein, potential-divider network B comprises four resistance, and resistance R 5 accesses the node between input and current sampling resistor Rs, other end ground connection after connecting with resistance R 6; Resistance R 3 accesses the node between current sampling resistor Rs and output, other end ground connection after connecting with resistance R 4; The in-phase input end of described subtracter is connected to the node between resistance R 5 and resistance R 6, and its anti-phase input is connected to the node between resistance R 3 and resistance R 4.
As shown in Figure 2, the power circuit that embodiment of the present utility model adopts adjustable stabilized voltage supply to form, by increasing current sampling resistor Rs and amplifier voltage-current converter circuit, pre-set compensating resistance Rc, according to the output current Iout of port, adjust in real time the output voltage of power supply, voltage loss with on compensation wire harness, realizes load terminal voltage and remains unchanged.The course of work of the present embodiment is as follows: current sampling resistor Rs becomes voltage by current conversion, and the potential-divider network B being comprised of 4 substitutional resistances is by the lower voltage at current sampling resistor Rs two ends, makes the operational amplifier U1 of rear class and comparator U2 can use output voltage V out power supply.After the voltage at current sampling resistor Rs two ends is amplified by operational amplifier U1, then the constant-current source being comprised of comparator U2 and compensating resistance Rc converts electric current to the feedback network of stabilized voltage power supply adjusted to control, to adjust compensation output voltage.
In Fig. 2, the pass between each resistance of potential-divider network B is:
; Pass between each resistance of subtracter is:
.
When R9+R7>>Rd, the output voltage V amp of operational amplifier U1 is
（4）
For adjustable stabilized voltage supply, the relation of the VFB of output voltage V out and feedback voltage is as follows:
So
（6）
According to (1) formula, (4) formula, (6) formula, can obtain
（7）
For load voltage Vload, desired value is stable 5V voltage, has
Wherein resistance R 1 sets in advance in circuit with current sampling resistor Rs, and wire harness resistance R t can draw by test, in the present embodiment, only need to set Rc according to these three parameters, just can, under different load currents, at load end, obtain stable 5V.
In the present embodiment, if system has higher than the direct voltage of Vout, to operational amplifier, power, the potential-divider network being comprised of 4 substitutional resistances can be deleted.Operational amplifier can be used conventional double operational integrated chip, has reached the object that reduces circuit cost.
Above-mentioned input power supply is not limited to adjustable stabilized voltage supply, also can be used for Switching Power Supply or linear power supply; The application of circuit is also not limited to USB port power supply, can be used for the occasion that other needs line loss compensation.
It is more than preferably implementation of the utility model; it should be noted that; in the situation that not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding changes and distortion according to the utility model, but these changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (7)
1. a power circuit with line loss compensation function, comprise the resistance R 1 and the resistance R 2 that are connected between output and ground, between resistance R 1 and resistance R 2, node TFB is set, it is characterized in that: also comprise the current sampling resistor Rs being connected between input port and output, and between input and load output and the amplifier voltage-current converter circuit (A) of redeeming.
2. the power circuit with line loss compensation function according to claim 1, it is characterized in that, described amplifier voltage-current converter circuit (A) comprises the subtracter being connected with current sampling resistor Rs, the comparator U2 being connected with subtracter, be connected on the switch element Q1 between node TFB and compensating resistance Rc, and compensating resistance Rc; The output of described subtracter is connected with the in-phase input end of comparator U2 by resistance R 11, the output of described comparator U2 is connected with the control end of switch element Q1, and the inverting input of described comparator U2 is connected to the node between switch element Q1 and compensating resistance Rc.
3. the power circuit with line loss compensation function according to claim 2, is characterized in that, described switch element Q1 is metal-oxide-semiconductor, and described compensating resistance Rc is connected with the source electrode of metal-oxide-semiconductor, and the output of described comparator U2 is connected with the grid of metal-oxide-semiconductor.
4. the power circuit with line loss compensation function according to claim 3, is characterized in that, described subtracter is to utilize differential type circuit to realize subtraction, and the circuit of realizing of described subtracter comprises integrated transporting discharging U1 and four or more resistance.
5. the power circuit with line loss compensation function according to claim 4, is characterized in that, also comprises the potential-divider network (B) being connected between current sampling resistor Rs and pressure reducer.
6. the power circuit with line loss compensation function according to claim 5, it is characterized in that, described potential-divider network (B) comprises four resistance, and resistance R 5 accesses the node between input and current sampling resistor Rs, other end ground connection after connecting with resistance R 6; Resistance R 3 accesses the node between current sampling resistor Rs and output, other end ground connection after connecting with resistance R 4; The in-phase input end of described subtracter is connected to the node between resistance R 5 and resistance R 6, and its anti-phase input is connected to the node between resistance R 3 and resistance R 4.
7. the power circuit with line loss compensation function according to claim 6, is characterized in that, described comparator U2 is integrated transporting discharging, and the integrated transporting discharging in described circuit is powered by output voltage V out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201320608038.8U CN203445784U (en) | 2013-09-29 | 2013-09-29 | Power supply circuit having line loss compensation function |
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| CN201320608038.8U CN203445784U (en) | 2013-09-29 | 2013-09-29 | Power supply circuit having line loss compensation function |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015180015A1 (en) * | 2014-05-26 | 2015-12-03 | 华为技术有限公司 | Power adapter, cable, and charger |
| CN105576959A (en) * | 2016-02-25 | 2016-05-11 | 上海斐讯数据通信技术有限公司 | Dynamic voltage automatic adjustment circuit and method |
| CN106059291A (en) * | 2015-04-01 | 2016-10-26 | 英飞凌科技奥地利有限公司 | Switching voltage regulator input voltage and current sensing |
| CN106936293A (en) * | 2015-12-28 | 2017-07-07 | 研祥智能科技股份有限公司 | A kind of power supply adaptor and its output voltage regulation circuit and adjusting method |
| US9973084B2 (en) | 2014-11-20 | 2018-05-15 | Infineon Technologies Austria Ag | Switching voltage regulator input power estimation |
| CN108803762A (en) * | 2018-07-05 | 2018-11-13 | 维沃移动通信有限公司 | A kind of low pressure difference linear voltage regulator and method for stabilizing voltage |
| CN109391007A (en) * | 2018-11-16 | 2019-02-26 | 北汽福田汽车股份有限公司 | Vehicle, charging unit |
| US10224812B1 (en) | 2017-10-13 | 2019-03-05 | Infineon Technologies Austria Ag | Sensing network mismatch compensation for switching voltage regulator with input voltage and current sensing |
| CN109491435A (en) * | 2018-12-28 | 2019-03-19 | 上海南芯半导体科技有限公司 | A kind of line loss compensation circuit and implementation method |
| US10389242B2 (en) | 2017-02-01 | 2019-08-20 | Infineon Technologies Austria Ag | Voltage and current sensing calibration for switching voltage regulators |
| CN113258770A (en) * | 2021-07-07 | 2021-08-13 | 上海芯龙半导体技术股份有限公司 | Line loss compensation module, switching power supply chip and system |
-
2013
- 2013-09-29 CN CN201320608038.8U patent/CN203445784U/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015180015A1 (en) * | 2014-05-26 | 2015-12-03 | 华为技术有限公司 | Power adapter, cable, and charger |
| US10063160B2 (en) | 2014-05-26 | 2018-08-28 | Huawei Technologies Co., Ltd. | Power adapter, cable, and charger |
| US9973084B2 (en) | 2014-11-20 | 2018-05-15 | Infineon Technologies Austria Ag | Switching voltage regulator input power estimation |
| CN106059291B (en) * | 2015-04-01 | 2018-11-30 | 英飞凌科技奥地利有限公司 | Regulator input voltage and current sense |
| CN106059291A (en) * | 2015-04-01 | 2016-10-26 | 英飞凌科技奥地利有限公司 | Switching voltage regulator input voltage and current sensing |
| US10069414B2 (en) | 2015-04-01 | 2018-09-04 | Infineon Technologies Austria Ag | Switching voltage regulator input voltage and current sensing |
| CN106936293B (en) * | 2015-12-28 | 2020-03-17 | 研祥智能科技股份有限公司 | Power adapter and output voltage regulating circuit and regulating method thereof |
| CN106936293A (en) * | 2015-12-28 | 2017-07-07 | 研祥智能科技股份有限公司 | A kind of power supply adaptor and its output voltage regulation circuit and adjusting method |
| CN105576959A (en) * | 2016-02-25 | 2016-05-11 | 上海斐讯数据通信技术有限公司 | Dynamic voltage automatic adjustment circuit and method |
| US10389242B2 (en) | 2017-02-01 | 2019-08-20 | Infineon Technologies Austria Ag | Voltage and current sensing calibration for switching voltage regulators |
| US10608537B2 (en) | 2017-02-01 | 2020-03-31 | Infineon Technologies Austria Ag | Input calibration for switching voltage regulators |
| US10224812B1 (en) | 2017-10-13 | 2019-03-05 | Infineon Technologies Austria Ag | Sensing network mismatch compensation for switching voltage regulator with input voltage and current sensing |
| CN108803762A (en) * | 2018-07-05 | 2018-11-13 | 维沃移动通信有限公司 | A kind of low pressure difference linear voltage regulator and method for stabilizing voltage |
| CN109391007A (en) * | 2018-11-16 | 2019-02-26 | 北汽福田汽车股份有限公司 | Vehicle, charging unit |
| CN109491435A (en) * | 2018-12-28 | 2019-03-19 | 上海南芯半导体科技有限公司 | A kind of line loss compensation circuit and implementation method |
| CN109491435B (en) * | 2018-12-28 | 2020-05-29 | 上海南芯半导体科技有限公司 | Line loss compensation circuit and implementation method |
| CN113258770A (en) * | 2021-07-07 | 2021-08-13 | 上海芯龙半导体技术股份有限公司 | Line loss compensation module, switching power supply chip and system |
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Address after: 516006 Guangdong province Huizhou City Zhongkai high tech Zone and five West Road No. 103 Patentee after: HUIZHOU DESAY SV AUTOMOTIVE Co.,Ltd. Address before: 516006 Guangdong province Huizhou City Zhongkai high tech Zone and five West Road No. 103 Patentee before: HUIZHOU DESAY SV AUTOMOTIVE Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140219 Termination date: 20210929 |
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| CF01 | Termination of patent right due to non-payment of annual fee |