CN204832315U - Two -way current detection circuit - Google Patents

Two -way current detection circuit Download PDF

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Publication number
CN204832315U
CN204832315U CN201520577858.4U CN201520577858U CN204832315U CN 204832315 U CN204832315 U CN 204832315U CN 201520577858 U CN201520577858 U CN 201520577858U CN 204832315 U CN204832315 U CN 204832315U
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China
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current
detecting
circuit
full wave
transmit
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CN201520577858.4U
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Inventor
邵攀峰
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Guangdong Aidi Beike Software Technology Co Ltd
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Guangdong Aidi Beike Software Technology Co Ltd
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Abstract

Two -way current detection circuit relates to current detection technical field, its detecting element who includes current transformer CT1, full wave rectification ware, sampling resistor and a unidirectional flux, and two inputs of current transformer CT1 concatenate in the circuit that is detected, two outputs of two inputs difference junction current mutual -inductor CT1 of full wave rectification ware, sampling resistor R1's both ends are connected respectively to two outputs of full wave rectification ware, sampling resistor R1 with the contact of the positive output end of full wave rectification ware detects signal output part for the current value, detecting element junction current mutual -inductor CT1's an output, the the direction of current flow of current transformer CT1 outlet side with detecting element switches on the direction when the same detecting element switches on, the the direction of current flow of current transformer CT1 outlet side with detecting element opposite direction switches on and the time detecting element ends.

Description

Bidirectional current testing circuit
Technical field
The invention relates to current detection technology field, is specifically related to a kind of bidirectional current testing circuit.
Background technology
Bidirectional electric energy converter can realize the bi-directional of electric energy, is widely used in the field such as ups power, electric automobile.In the control of electrical energy transformer, need sample rate current, because electrical energy transfer direction is different, direction of current is also different, and the current sensing device selected needs to detect positive current can detect negative current again.Because also need to detect current value, the usual way detecting current value detects certain voltage changed with current value, and then converting draws current value, so current sensing device needs to detect positive voltage, can detect negative voltage again.But most of control chip does not possess the ability accepting positive and negative two polar voltages, needs rear class modulate circuit to carry out translation to voltage for this reason, this rear class modulate circuit complex structure, cost is high.
Summary of the invention
For the above-mentioned technical matters that prior art exists, the invention provides a kind of bidirectional current testing circuit, and it can detect sense of current and size, and circuit structure is simple.
For achieving the above object, the invention provides following technical scheme.
Bidirectional current testing circuit, comprise current sampling circuit, current value testing circuit and current direction detection circuit, current sampling circuit comprises Current Transmit 1, two input ends of Current Transmit 1 are serially connected with detected circuit, current value testing circuit comprises a full wave rectifier and sampling resistor R1, two input ends of described full wave rectifier connect two output terminals of Current Transmit 1 respectively, two output terminals of described full wave rectifier connect the two ends of sampling resistor R1 respectively, the contact of the cathode output end of sampling resistor R1 and described full wave rectifier is current value detection signal output terminal, current direction detection circuit comprises the detecting element of an one-way conduction, described detecting element connects an output terminal of Current Transmit 1, described detecting element conducting when the direction of current of Current Transmit 1 outgoing side is identical with the conducting direction of described detecting element, when the direction of current of Current Transmit 1 outgoing side is contrary with the conducting direction of described detecting element, described detecting element ends.
Wherein, described full wave rectifier is the full-bridge rectifier be made up of four diodes.
Wherein, described detecting element is optocoupler U1, optocoupler U1 input end connects an output terminal of Current Transmit 1, another input end grounding, an output terminal connects power supply via divider resistance R2, another output head grounding, the contact of divider resistance R2 and optocoupler U1 is current direction detection signal output part.
Wherein, described detecting element is diode D5, and diode D5 positive pole connects an output terminal of Current Transmit 1, and negative pole is via ground connection after divider resistance R3.
The beneficial effect of the invention is: the bidirectional current testing circuit of the invention to be sampled the electric current that need detect by current sampling circuit, then the detection that current value testing circuit and current direction detection circuit carry out current value and direction of current is sent to respectively, current value testing circuit only detects the size of current value, it adopts full wave rectifier to carry the electric current of coming to carry out rectification to current sampling circuit, and then can convert according to the voltage at sampling resistor R1 two ends draws the current value of tested electric current; Current direction detection circuit only detects tested sense of current, and it adopts the detecting element of an one-way conduction to realize, and the both direction of this detecting element conducting and the corresponding tested electric current of cut-off difference, detects with this and draw tested sense of current.The detecting element that circuit mainly contains Current Transmit 1, full wave rectifier and one-way conduction is formed, and structure is simple, and cost is low.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the bidirectional current testing circuit of embodiment 1.
Fig. 2 is the schematic diagram of the bidirectional current testing circuit of embodiment 2.
Embodiment
Below in conjunction with specific embodiment, the invention is elaborated.
embodiment 1
As shown in Figure 1, A unit, transformer T1 and unit B form a bidirectional electric energy converter, it has DC1 and DC2 two ports, Current Transmit 1 is as the current sampling circuit of the bidirectional current testing circuit of the present embodiment, diode D1-D4 forms a full-bridge rectifier, itself and sampling resistor R1 form the current value testing circuit of the bidirectional current testing circuit of the present embodiment, and optocoupler U1 and divider resistance R2 forms the current direction detection circuit of the bidirectional current testing circuit of the present embodiment.
Circuit connecting relation is see Fig. 1, Current Transmit 1 is sampled the electric current in described bidirectional electric energy converter, this sample rate current one road is sent to the full-bridge rectifier be made up of diode D1-D4, this full-bridge rectifier carries out full-wave rectification to described sample rate current, and export sampling resistor R1 formation loop to, the size of described sample rate current reflects the size of tested electric current, described sample rate current is rectified and all flows through sampling resistor R1 afterwards, the voltage signal at sampling resistor R1 two ends exports DSP to as current value detection signal OUT1, can convert according to the magnitude of voltage at sampling resistor R1 two ends and draw the current value of tested electric current.
Another road of described sample rate current is sent to an input end of optocoupler U1, one-way conduction between two input ends of optocoupler U1, when conducting direction between the direction and two input ends of optocoupler U1 of described sample rate current is identical, conducting between two input ends of optocoupler U1, also conducting thus between two output terminals of optocoupler U1, current direction detection signal OUT2 is low level; When conducting direction between the direction and two input ends of optocoupler U1 of described sample rate current is contrary, end between two input ends of optocoupler U1, also end thus between two output terminals of optocoupler U1, current direction detection signal OUT2 is high level.So, tested sense of current is detected.
embodiment 2
The difference of the present embodiment and embodiment 1 is the particular circuit configurations of current direction detection circuit, and as shown in Figure 2, in the present embodiment, diode D5 and divider resistance R3 forms current direction detection circuit.When the direction of described sample rate current is identical with the conducting direction of diode D5, diode D5 conducting, current direction detection signal OUT2 is high level; When the direction of described sample rate current is contrary with the conducting direction of diode D5, diode D5 ends, and current direction detection signal OUT2 is low level.So, tested sense of current is detected.
The bidirectional current testing circuit of the present embodiment is identical with other parts of the bidirectional current testing circuit of embodiment 1, does not repeat them here.
Finally should be noted that; above embodiment is only in order to illustrate the technical scheme of the invention; but not the restriction to the invention protection domain; although done to explain to the invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to the technical scheme of the invention or equivalent replacement, and not depart from essence and the scope of the invention technical scheme.

Claims (4)

1. bidirectional current testing circuit, it is characterized in that, comprise current sampling circuit, current value testing circuit and current direction detection circuit, current sampling circuit comprises Current Transmit 1, two input ends of Current Transmit 1 are serially connected with detected circuit, current value testing circuit comprises a full wave rectifier and sampling resistor R1, two input ends of described full wave rectifier connect two output terminals of Current Transmit 1 respectively, two output terminals of described full wave rectifier connect the two ends of sampling resistor R1 respectively, the contact of the cathode output end of sampling resistor R1 and described full wave rectifier is current value detection signal output terminal, current direction detection circuit comprises the detecting element of an one-way conduction, described detecting element connects an output terminal of Current Transmit 1, described detecting element conducting when the direction of current of Current Transmit 1 outgoing side is identical with the conducting direction of described detecting element, when the direction of current of Current Transmit 1 outgoing side is contrary with the conducting direction of described detecting element, described detecting element ends.
2. bidirectional current testing circuit according to claim 1, is characterized in that, described full wave rectifier is the full-bridge rectifier be made up of four diodes.
3. bidirectional current testing circuit according to claim 1, it is characterized in that, described detecting element is optocoupler U1, optocoupler U1 input end connects an output terminal of Current Transmit 1, another input end grounding, an output terminal connects power supply via divider resistance R2, and another output head grounding, the contact of divider resistance R2 and optocoupler U1 is current direction detection signal output part.
4. bidirectional current testing circuit according to claim 1, is characterized in that, described detecting element is diode D5, and diode D5 positive pole connects an output terminal of Current Transmit 1, and negative pole is via ground connection after divider resistance R3.
CN201520577858.4U 2015-08-04 2015-08-04 Two -way current detection circuit Active CN204832315U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520577858.4U CN204832315U (en) 2015-08-04 2015-08-04 Two -way current detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520577858.4U CN204832315U (en) 2015-08-04 2015-08-04 Two -way current detection circuit

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CN204832315U true CN204832315U (en) 2015-12-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107820668A (en) * 2017-02-09 2018-03-20 上海欣锐电控技术有限公司 A kind of two-way changing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107820668A (en) * 2017-02-09 2018-03-20 上海欣锐电控技术有限公司 A kind of two-way changing device

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