CN112688555A - Device and method for nondestructive measurement of bidirectional current in direct current-direct current converter - Google Patents
Device and method for nondestructive measurement of bidirectional current in direct current-direct current converter Download PDFInfo
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- CN112688555A CN112688555A CN201911086237.5A CN201911086237A CN112688555A CN 112688555 A CN112688555 A CN 112688555A CN 201911086237 A CN201911086237 A CN 201911086237A CN 112688555 A CN112688555 A CN 112688555A
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Abstract
本发明公开了一种直流‑直流变换器中无损测量双向电流装置，低通滤波器并联设置在电感两端，低通滤波器包括电容和电阻，电压‑电流转换电路并联设置在电容两端，电压‑电流转换电路的输出端连接PNP极性的双输出镜像电流源，偏置电流产生电路连接NPN极性的双输出镜像电流源，NPN极性的双输出镜像电流源的两路输出电路和PNP极性的双输出镜像电流源的两路输出电路分别对接后形成一号电路和二号电路，一号电路上设有一号支路，二号电路上连接有二号支路，二号支路上连接有输出电阻。本发明还提供了一种直流‑直流变换器中无损测量双向电流方法。本发明中无需额外的电流采样电阻，极大降低了欧姆损耗，提高了整体效率。
The invention discloses a non-destructive measuring bidirectional current device in a DC-DC converter. A low-pass filter is arranged in parallel at both ends of an inductor, the low-pass filter includes a capacitor and a resistance, and a voltage-current conversion circuit is arranged in parallel at both ends of the capacitor. The output end of the voltage-current conversion circuit is connected to the dual-output mirror current source of PNP polarity, the bias current generation circuit is connected to the dual-output mirror current source of NPN polarity, and the two-way output circuit of the dual-output mirror current source of NPN polarity and The two output circuits of the dual-output mirror current source with PNP polarity are connected to form circuit 1 and circuit 2. Circuit 1 is provided with branch 1, circuit 2 is connected with branch 2, and An output resistor is connected on the road. The invention also provides a method for nondestructive measurement of bidirectional current in the DC-DC converter. In the present invention, no additional current sampling resistor is needed, the ohmic loss is greatly reduced, and the overall efficiency is improved.
Description
Technical Field
The invention relates to the field of high-current low-voltage direct current-direct current converters, in particular to a device and a method for nondestructively measuring bidirectional current in a direct current-direct current converter.
Background
In a low-voltage high-current dc-dc converter, due to the performance limitation of the single semiconductor switching device, multiple sets of dc-dc converters are generally required to be connected in parallel to provide sufficient current. When a plurality of groups of direct current converters are connected in parallel, uniform distribution of load current needs to be ensured, and the output current of a single converter needs to be controlled by collecting the inductive current information of each converter. The traditional current sampling needs to add a sampling resistor on a current path, and considerable loss can be generated under the working condition of low voltage and large current, so that the overall efficiency of the converter is seriously influenced. In addition, the commonly used differential amplifier circuit for amplifying the voltage signals at two ends of the sampling resistor also has the problems of strict requirement on element errors, limited bandwidth and the like. The hall current sensor can be used for realizing bidirectional nondestructive detection of current, but the hall current sensor has large volume, generally limited bandwidth and high cost, and can obviously improve the cost of the converter. Therefore, a method for nondestructively detecting current at high speed is urgently needed in a bidirectional low-voltage high-current converter.
Disclosure of Invention
The invention aims to provide a device for nondestructively measuring bidirectional current in a direct current-direct current converter.
The invention also provides a method for nondestructively measuring the bidirectional current in the DC-DC converter.
The invention has the innovation points that no additional current sampling resistor is needed, so that the ohmic loss is greatly reduced, and the overall efficiency is improved; and bidirectional current detection is realized on the premise of low loss.
In order to achieve the purpose, the technical scheme of the invention is as follows: a device for nondestructively measuring bidirectional current in a direct current-direct current converter comprises a bidirectional direct current-direct current converter, a low-pass filter, a positive and negative voltage supply circuit, a voltage-current conversion circuit, a bias current generating circuit, an NPN polarity dual-output mirror current source, a PNP polarity dual-output mirror current source and an output resistor, wherein an inductor is arranged in the bidirectional direct current-direct current converter, the low-pass filter is arranged at two ends of the inductor in parallel and comprises a capacitor and a resistor, the voltage-current conversion circuit is arranged at two ends of the capacitor in parallel, the positive and negative voltage supply circuit supplies power to the voltage-current conversion circuit, the output end of the voltage-current conversion circuit is connected with the PNP polarity dual-output mirror current source, the bias current generating circuit is connected with the NPN polarity dual-output mirror current source, and two output circuits of the NPN polarity dual-output mirror current source and two output circuits of the And a first circuit and a second circuit are formed after butt joint, the first circuit is provided with a first branch which is connected to the voltage-current conversion circuit, the second circuit is connected with a second branch, and the second branch is connected with an output resistor.
Furthermore, output tubes of the NPN-polarity dual-output mirror current source and the PNP-polarity dual-output mirror current source are twin triode pair tubes. The twin triode geminate transistors are used, so that mismatching of feedback current and output current can be greatly reduced, and the precision and the linearity of the current detection circuit are improved.
A method for non-destructively measuring a bi-directional current in a dc-dc converter, comprising the steps of:
(1) the low-pass filter generates a pole, and the frequency of the pole is adjusted to be coincident with the frequency of the inductance zero point;
(2) the voltage-current conversion circuit proportionally converts the voltage of the capacitor in the low-pass filter into a current signal;
(3) after the output end of the voltage-current conversion circuit is connected with a PNP-polarity double-output mirror current source, the PNP-polarity double-output mirror current source generates two currents with the same magnitude as the output current of the voltage-current conversion circuit;
(4) the bias current generating circuit inputs an NPN polarity double-output mirror current source to generate two paths of bias currents with the same magnitude;
(5) after two output circuits of the NPN-polarity dual-output mirror current source and two output circuits of the PNP-polarity dual-output mirror current source are respectively butted, the NPN-polarity dual-output mirror current source simultaneously subtracts two bias currents from two outputs of the PNP-polarity dual-output mirror current source;
(6) after subtraction, the output current of the second circuit generates voltage drop on the output resistor, and the output current of the first circuit is connected to the voltage-current conversion circuit to form a direct-current coupled deep negative feedback closed loop;
(7) the output voltage of the output resistor is measured and is proportional to the voltage across the inductor.
The invention has the beneficial effects that:
1. according to the invention, an additional current sampling resistor is not needed, so that ohmic loss is greatly reduced, and the overall efficiency is improved;
2. the invention realizes bidirectional current detection on the premise of low loss.
3. The invention realizes higher bandwidth, better reserves the transient waveform of the inductive current and provides conditions for rapid current control.
4. The invention has a wide common-mode voltage range, which can be very close to 0V or lower than 0V. The circuit can normally measure the inductor current waveform at a lower output voltage.
5. The high loop gain of the invention ensures a good linear relationship between the output voltage and the inductor current.
6. In the invention, because the output of the current measuring circuit is of current source characteristics, the reference of the output voltage can be any external voltage specified by a designer, and the current measuring circuit is conveniently connected with an ADC (analog-to-digital converter) of a subsequent analog circuit or a digital circuit.
7. The output tube in the multi-output PNP and NPN current mirror source uses the twin triode geminate transistor, so that the mismatching of the feedback current and the output current can be greatly reduced, and the precision and the linearity of the current detection circuit are improved.
8. Because of the existence of the depth negative feedback, the error between the input tube and the output tube of the current mirror image source basically does not influence the precision and the linearity of the output.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Example 1: a device for nondestructively measuring bidirectional current in a direct current-direct current converter comprises a bidirectional direct current-direct current converter 1, a low-pass filter 2, a positive and negative voltage supply circuit 3, a voltage-current conversion circuit 4, a bias current generating circuit 5, an NPN polarity dual-output mirror current source 6, a PNP polarity dual-output mirror current source 7 and an output resistor 8, wherein an inductor 1.1 is arranged in the bidirectional direct current-direct current converter 1, the low-pass filter 2 is arranged at two ends of the inductor 1.1 in parallel, the low-pass filter 2 comprises a capacitor 2.1 and a resistor 2.2, the voltage-current conversion circuit 3 is arranged at two ends of the capacitor 2.1 in parallel, the positive and negative voltage supply circuit 4 supplies power to the voltage-current conversion circuit 3, the output end of the voltage-current conversion circuit 3 is connected with the PNP polarity dual-output mirror current source 7, the bias current generating circuit 5 is connected with, two output circuits of the NPN-polarity double-output mirror current source 6 and two output circuits of the PNP-polarity double-output mirror current source 7 are respectively butted to form a first circuit 9 and a second circuit 10 after being butted, a first branch 11 is arranged on the first circuit 9, the first branch 11 is connected to the voltage-current conversion circuit 4, a second branch 12 is connected to the second circuit 10, and an output resistor 8 is connected to the second branch 12. Output tubes of the NPN-polarity dual-output mirror current source 6 and the PNP-polarity dual-output mirror current source 7 are twin triode geminate transistors.
Example 2: a method for non-destructively measuring a bi-directional current in a dc-dc converter, comprising the steps of: the low-pass filter 2 generates a pole, and the low-pass filter 2 is adjusted to enable the frequency of the pole to be coincident with the frequency of the zero point of the inductor 1.1; the positive and negative voltage power supply circuit 3 supplies power to the voltage-current conversion circuit 4, and the voltage-current conversion circuit 4 converts the voltage of the capacitor 2.1 in the low-pass filter 2 into a current signal in proportion; after the output end of the voltage-current conversion circuit 4 is connected with the PNP-polarity double-output mirror current source 7, the PNP-polarity double-output mirror current source 7 generates two currents with the same magnitude as the output current of the voltage-current conversion circuit; the bias current generating circuit 5 inputs an NPN polarity dual-output mirror current source 6 to generate two paths of bias currents with the same magnitude; after two output circuits of the NPN-polarity dual-output mirror current source 6 and two output circuits of the PNP-polarity dual-output mirror current source 7 are respectively butted, the NPN-polarity dual-output mirror current source 6 simultaneously subtracts two bias currents from two outputs of the PNP-polarity dual-output mirror current source 7; after subtraction, the output current of the second circuit 10 generates voltage drop on the output resistor 8, and the output current of the first circuit 9 is connected to the voltage-current conversion circuit 4 to form a direct-current coupled deep negative feedback closed loop; the output voltage of the output resistor 8 is measured, the output voltage 8 being proportional to the voltage across the inductor 1.1. The output voltage of the output resistor 8 is equal to the current on the second circuit 10 minus the current on the NPN-polarity dual-output mirror current source 6 multiplied by the resistance of the output resistor 8, the current on the second circuit 10 can be obtained because the output voltage of the output resistor 8, the resistance of the output resistor 8 and the NPN-polarity dual-output mirror current source 6 are known, the current on the second circuit 10 is equal to the current on the first circuit 9, the voltage at two ends of the capacitor of the low-pass filter 2 can be derived from the current on the first circuit 9, and the voltage at two ends of the capacitor 2.1 of the low-pass filter 2 and the current flowing through the inductor 1.1 have a linear relation, so that the current flowing through the inductor 1.1 can be obtained.
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090146643A1 (en) * | 2007-12-11 | 2009-06-11 | Primarion, Inc. | Methods and apparatus for current sensing |
| CN101789687A (en) * | 2010-03-23 | 2010-07-28 | 浙江大学 | Average current mode controller based on inductance current self-calibration lossless detection |
| US20110279133A1 (en) * | 2010-05-17 | 2011-11-17 | Siflare, Inc | Electric Current Measurement |
| CN102545611A (en) * | 2010-12-03 | 2012-07-04 | 马克西姆综合产品公司 | Inductor current measurement system and method for DC to DC converters |
| CN107656123A (en) * | 2017-04-24 | 2018-02-02 | 深圳市华芯邦科技有限公司 | Buck load current detection circuits and method with compensation circuit |
| CN107659151A (en) * | 2017-04-24 | 2018-02-02 | 深圳市华芯邦科技有限公司 | Buck load current detection circuits and method without external sampling resistance |
| CN108964464A (en) * | 2017-05-19 | 2018-12-07 | 上海芯熠微电子有限公司 | The circuit and its method of Switching Power Supply outlet side non-destructive testing load current |
-
2019
- 2019-11-08 CN CN201911086237.5A patent/CN112688555B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090146643A1 (en) * | 2007-12-11 | 2009-06-11 | Primarion, Inc. | Methods and apparatus for current sensing |
| CN101789687A (en) * | 2010-03-23 | 2010-07-28 | 浙江大学 | Average current mode controller based on inductance current self-calibration lossless detection |
| US20110279133A1 (en) * | 2010-05-17 | 2011-11-17 | Siflare, Inc | Electric Current Measurement |
| CN102545611A (en) * | 2010-12-03 | 2012-07-04 | 马克西姆综合产品公司 | Inductor current measurement system and method for DC to DC converters |
| CN107656123A (en) * | 2017-04-24 | 2018-02-02 | 深圳市华芯邦科技有限公司 | Buck load current detection circuits and method with compensation circuit |
| CN107659151A (en) * | 2017-04-24 | 2018-02-02 | 深圳市华芯邦科技有限公司 | Buck load current detection circuits and method without external sampling resistance |
| CN108964464A (en) * | 2017-05-19 | 2018-12-07 | 上海芯熠微电子有限公司 | The circuit and its method of Switching Power Supply outlet side non-destructive testing load current |
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