Cell voltage differential sampling circuit
A voltage differential, sampling circuit technology, applied in the direction of measuring current/voltage, differential amplifier, measuring electricity, etc., can solve the problem of low sampling value
Pending Publication Date: 2022-05-20
GUANGDONG HYNN TECH CO LTD
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Problems solved by technology
That is, when the negative sampling probe of the battery cell is not in good contact, the sampling value Vout2 is lower than the sampling value when the positive and negative electrodes of the battery cell are connected normally.
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[0063] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.
[0064] The invention discloses a cell voltage differential sampling circuit, please refer to the attached Figure 7 , which includes a front-end integrated operational amplifier U1, a rear-end integrated operational amplifier U2, the first auxiliary reference voltage input terminal Vin1_ref, the second auxiliary reference voltage input terminal Vin2_ref, the positive pole Vin2 of the battery cell, and the negative pole Vin1 of the battery cell. The first auxiliary The reference voltage input terminal Vin1_ref is used to access a positive voltage, the second auxiliary reference voltage input terminal Vin2_ref is used to access a negative voltage, and the voltage signal of the first auxiliary reference voltage input terminal Vin1_ref and the cell negative pole Vin1 are both transmitted to the inverting terminal of the front-end integrated operation...
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The invention discloses a battery cell voltage differential sampling circuit which comprises a front-end integrated operational amplifier, a rear-end integrated operational amplifier, a first auxiliary reference voltage input end, a second auxiliary reference voltage input end, a battery cell positive electrode and a battery cell negative electrode. The second auxiliary reference voltage input end is used for accessing negative voltage, voltage signals of the first auxiliary reference voltage input end and the negative electrode of the battery cell are transmitted to the anti-phase end of the front-end integrated operational amplifier, and voltage signals of the second auxiliary reference voltage input end and the positive electrode of the battery cell are transmitted to the in-phase end of the front-end integrated operational amplifier. A voltage signal of the output end of the front-end integrated operational amplifier is transmitted to the in-phase end of the rear-end integrated operational amplifier, and the anti-phase end of the rear-end integrated operational amplifier is connected with the output end. According to the invention, fault signals caused by poor contact or falling of voltage sampling during formation and capacity grading of the battery cell can be rapidly identified, so that the use safety of equipment is improved.
Description
technical field [0001] The invention relates to a differential sampling circuit, in particular to a cell voltage differential sampling circuit. Background technique [0002] The differential amplifier circuit uses the symmetry and negative feedback of circuit parameters to effectively stabilize the static operating point. It is characterized by amplifying differential mode signals and suppressing common mode signals. It is widely used in the input stage of direct coupling circuits and measurement circuits. The external signal input of the differential amplifier circuit is divided into two basic input states of differential mode and common mode. When an external signal is applied between the two input terminals so that the two input signals Vi1 and Vi2 are equal in size and opposite in polarity, it is called a differential mode input signal. When the external signal is added between the two input terminals and the ground, so that Vi1 and Vi2 are equal in size and polarity, i...
Claims
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IPC IPC(8): G01R19/25H03F3/45G01R31/382G01R31/389
CPCG01R19/2509H03F3/45071G01R31/389G01R31/382Y02T10/70
Inventor 韦献柳吴辉王守模
Owner GUANGDONG HYNN TECH CO LTD