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A multifunctional multi-gear current detection circuit and method
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A technology of current detection circuit and detection method, applied in the direction of measuring current/voltage, only measuring current, measuring device, etc., can solve the problems of increasing circuit area, cumbersome circuit detection, increasing detection resources, etc., to reduce power consumption and area , The detection period can be adjusted, and the circuit area is small.
Active Publication Date: 2019-07-19
SOUTH CHINA UNIV OF TECH
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In addition, because different gears have different influences on the circuit, in order to detect large current overcurrent more quickly, the detection cycle is also different, and the current detection cycle of the high current gear should be shorter than that of the low current gear
[0003] The traditional detection method uses to charge capacitors of different sizes or to control the detection period of the gear through the counter. This method not only increases the circuit area, but also each detection circuit can only detect one gear, so that different cycles Multi-level and multi-functional circuit detection is cumbersome and wastes resources. According to the increase of gears and functions, the detection resources will be doubled, consuming more power consumption and circuit area.
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Embodiment 1
[0032] This embodiment is an application example of the same gating clock, such as Figure 4 As shown, clk1, clk2, and clk3 are three groups of gating clocks of the gating circuit, and the three clock periods are the same. When the level is high, the reference voltage of over-current gear 1, the reference voltage of over-current gear 2 and the reference voltage of short-circuit detection are selected respectively, and only one gear is turned on each time. clk4 is the comparator detection clock, and the comparator works when the clk4 clock is at a high level, so the high level of clk4 includes the high levels of all clocks of clk1, clk2, and clk3. Because the clocks of clk1, clk2, and clk3 are turned on to different gears respectively, the comparator performs the detection of overcurrent gear 1, the detection of overcurrent gear 2 and the comparison of short circuit detection respectively in sequence. clk5, clk6, and clk7 latch the results of gear position detection respective...
Embodiment 2
[0034] This embodiment is an application example in which the gating clock periods are different.
[0035] Such as Figure 5 As shown, clk1, clk2, and clk3 are used as the gating clocks of the gears, and can also be regarded as the detection clocks of the corresponding gears.
[0036] clk3 is the short-circuit detection clock, so that its detection cycle is the shortest, set as Tclk3;
[0037] clk2 is the overcurrent gear 2 detection clock, and the period is set to m times of clk3: Tclk2=Tclk3*m;
[0038] clk1 is the detection clock for overcurrent gear 1, and the period is set to n times of clk2, and n*m times of clk3: Tclk1=Tclk3*n*m;
[0039] clk4 is the comparator detection clock, the period is the same as clk3: Tclk4=Tclk3.
[0040] However, only one detection gear can be turned on at the same time. Therefore, when the gears are turned on at the same time, the priority is clk1>clk2>clk3 to generate the strobe clock, that is, when the over-current gear 1 is turned on, ...
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Abstract
The invention discloses a current detection circuit with multifunctional and multi-position and method. A gating circuit comprises a plurality of sub-circuits. A reference voltage is input in an inputend of each sub-circuit. Each sub-circuit is provided with a strobe clock. The gating clock controls the conduction state of the sub-circuit by controlling the conduction state of a field effecttransistor in the sub-circuit, thereby controlling a reference voltage output by the gating circuit. The gating circuit outputs the reference voltage to a comparator. The other input end of the comparatorinputs a detection voltage. The comparator compares the detection voltage with the reference voltage to obtain a detection result and outputs the detection result to a latch to latch. The current detection circuit with multifunctional and multi-position and an adjustable detection period and the method are realized through the comparator. The multiplexing of the comparator reduces the power consumption and area of the circuit. The current detection circuit with multifunctional multi-position and the method have the advantages of low in power consumption, small in circuit area, and adjustablein detection period.
Description
technical field [0001] The invention relates to a semiconductorintegrated circuit, in particular to a multifunctional and multi-gear current detection circuit and method. Background technique [0002] Due to the large discharge current of the battery, the discharge current of different loads is different. In order to detect the battery discharge current, multi-function and multi-gear are required for more detailed real-time monitoring of its status. The degree of influence of the overcurrent and short circuit of the circuit on the circuit is different, and the impact of the short circuit on the circuit is greater and faster; the greater the overcurrent, the greater the damage to the circuit. Therefore, the finer the detection gear, the more you can understand the real-time current range of the circuit, and take corresponding protection measures for the circuit. In addition, because different gears have different influences on the circuit, in order to detect large current ...
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Application Information
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