CN210155202U - Current measurement conversion system - Google Patents
Current measurement conversion system Download PDFInfo
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- CN210155202U CN210155202U CN201920097120.6U CN201920097120U CN210155202U CN 210155202 U CN210155202 U CN 210155202U CN 201920097120 U CN201920097120 U CN 201920097120U CN 210155202 U CN210155202 U CN 210155202U
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Abstract
The utility model relates to a current measurement equipment technical field, in particular to current measurement conversion system, including measuring conversion module, power, interface, measurement conversion module constitute by high-end current detector and voltage follower, high-end current detector in be equipped with current detection chip, sampling resistor, voltage follower use a rail to the accurate operational amplifier of rail and constitute, the power constitute by low-voltage difference voltage stabilization chip of micropower and peripheral filter capacitance, the power through the low-voltage difference voltage stabilization chip of micropower conversion output a stable 5V voltage supply voltage follower, the interface be furnished with FPC interface and XH2.54 interface. The utility model has the advantages that: the signal quality is improved, and meanwhile, the control equipment is prevented from being damaged by the output over-high voltage; an independent power supply module is arranged in the power supply module, so that the power supply quality is improved, and the interference caused by the power supply is reduced.
Description
Technical Field
The utility model relates to a current measurement equipment technical field, in particular to current measurement switching system.
Background
Most high-power equipment during operation all will produce great electric current, like battery, motor etc. for control and monitor its running state, protection equipment do not receive the overcurrent damage, need use a device to measure consumer electric current to turn into the voltage signal that control equipment can direct input gather with it, prior art has following problem:
(1) the existing current sensor module based on the sampling resistor basically measures the current flowing through the sampling resistor by simply using a single chip, and has the problems of weak output signal and easy interference;
(2) the existing current sensor module needs external power supply, and the power supply quality is poor;
(3) the existing product has over-small sampling resistance power and poor heat dissipation, and cannot measure larger current;
(4) the existing current sensor module has a single interface, only has a pin header interface and does not have an FPC interface matched with a lithium polymer battery.
Disclosure of Invention
In order to solve the problems of the prior art, the utility model provides a can improve signal quality, can improve the quality of power supply current measurement conversion system.
The technical scheme of the utility model as follows:
a current measurement conversion system comprises a measurement conversion module, a power supply and an interface, wherein the measurement conversion module consists of a high-end current detector and a voltage follower, a current detection chip and a sampling resistor are arranged in the high-end current detector, the voltage follower consists of a rail-to-rail precision operational amplifier, the power supply consists of a micro-power consumption low-voltage difference voltage stabilizing chip and a peripheral filter capacitor, the power supply outputs a stable 5V voltage to supply to the voltage follower through the conversion of the micro-power consumption low-voltage difference voltage stabilizing chip, and the interface is provided with an FPC interface and an XH2.54 interface.
The FPC is connected with the lithium polymer battery in an interface mode.
The XH2.54 interface is connectable to a control device.
The sampling resistor adopts a 3W power sampling resistor and is provided with a large-area radiating pad,
the current which can be measured by the sampling resistor is less than or equal to 12A.
The utility model provides a beneficial effect that technical scheme brought is:
(1) the rail-to-rail precise operational amplifier is used for buffering and outputting the measurement signal, so that the signal quality is improved, and the control equipment is prevented from being damaged by the output over-high voltage;
(2) an independent power supply module is arranged in the power supply module, so that the power supply quality is improved, and the interference caused by a power supply is reduced;
(3) the pin header and the FPC interface are simultaneously equipped, so that the device can be suitable for various applications such as lithium polymer batteries, lithium ion batteries, motors and the like, and particularly for power management of the lithium polymer batteries by a single chip microcomputer system.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a circuit diagram of the measurement conversion module of the present invention.
Fig. 2 is a circuit diagram of a power supply portion of the present invention.
Fig. 3 is a circuit diagram of the interface portion of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1-3, a current measurement conversion system includes a measurement conversion module, a power supply, and an interface, where the measurement conversion module includes a high-end current detector and a voltage follower, a current detection chip and a sampling resistor are disposed in the high-end current detector, the voltage follower includes a rail-to-rail precision operational amplifier, the power supply includes a micropower low-dropout regulator chip and a peripheral filter capacitor, the power supply outputs a stable 5V voltage to the voltage follower through the micropower low-dropout regulator chip, and the interface is equipped with an FPC interface and an XH2.54 interface.
The FPC interface can be conveniently connected with the lithium polymer battery to realize the measurement of the output current of the lithium polymer battery.
The XH2.54 interface can be connected with a control device such as a singlechip system, transmits a measurement output signal to the control device, and can supply power to the control device.
As shown in FIG. 1, a high voltage power supply (such as a battery) is input from V _ BAT, filtered by resistors and capacitors C1 and R2, current is limited by a resistor R1, and then supplied to a current detection chip INA169, the chip outputs a current signal according to the current flowing through a sampling resistor R3, and the current signal is converted by a resistor R4 and filtered by a capacitor C2 to obtain a first voltage signal. In order to prevent the weak voltage signal from being influenced by the input impedance of different control devices, a rail-to-rail precision operational amplifier OPA340 is connected into a voltage follower to buffer the voltage signal, so that the measured value is more stable and reliable. Meanwhile, the OPA340 is powered by a 5V power supply, so that the maximum output of the OPA is limited not to exceed 5V, and the control equipment (such as a single chip microcomputer) is prevented from being damaged by an overhigh voltage signal. The sampling resistor R3 adopts a high-power (3W) sampling resistor and is provided with a large-area heat dissipation pad, and the maximum value can be measured at 12A.
As shown in fig. 2, the power supply part is composed of a micro-power consumption low dropout regulator chip HT7150 and its peripheral filter capacitors (C3, C4, C5, C6). The module can directly take power from the measured object (such as a battery) to supply to the current detector, and the HT7150 converts the power to output a stable 5V power supply to the OPA 340.
As shown in fig. 3, the interface section is provided with an FPC interface P2 and an XH2.54 interface P1. The FPC interface can be conveniently connected with the lithium polymer battery to realize the measurement of the output current of the lithium polymer battery. The XH2.54 interface can be connected to control equipment, such as a single chip microcomputer system, and transmits the measurement output signal to the control equipment, and can supply power to the control equipment at the same time.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. A current measurement conversion system comprises a measurement conversion module, a power supply and an interface, and is characterized in that the measurement conversion module consists of a high-end current detector and a voltage follower, a current detection chip and a sampling resistor are arranged in the high-end current detector, the voltage follower consists of a rail-to-rail precision operational amplifier, the power supply consists of a micro-power consumption low-voltage difference voltage stabilization chip and a peripheral filter capacitor, the power supply outputs a stable 5V voltage to the voltage follower through the conversion of the micro-power consumption low-voltage difference voltage stabilization chip, and the interface is provided with an FPC interface and an XH2.54 interface.
2. A current measurement and conversion system according to claim 1, wherein said FPC interfaces with a lithium polymer battery.
3. A current measurement conversion system according to claim 1, characterised in that said XH2.54 interface is connectable to a control device.
4. An electrical current measuring and converting system according to claim 1, wherein said sampling resistor is a 3W power sampling resistor with large area heat dissipating pads.
5. A current measuring transducer system as claimed in claim 1 or 4, wherein the sampling resistor is capable of measuring a current of ≦ 12A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920097120.6U CN210155202U (en) | 2019-01-14 | 2019-01-14 | Current measurement conversion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920097120.6U CN210155202U (en) | 2019-01-14 | 2019-01-14 | Current measurement conversion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210155202U true CN210155202U (en) | 2020-03-17 |
Family
ID=69754437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920097120.6U Expired - Fee Related CN210155202U (en) | 2019-01-14 | 2019-01-14 | Current measurement conversion system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210155202U (en) |
-
2019
- 2019-01-14 CN CN201920097120.6U patent/CN210155202U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200317 Termination date: 20220114 |
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| CF01 | Termination of patent right due to non-payment of annual fee |