Voltage detection circuit
A voltage detection circuit and input voltage technology, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of complex design of voltage detection circuit and power consumption, and achieve low power consumption, simple implementation, and chip saving area effect
Pending Publication Date: 2017-09-05
合肥灿芯科技有限公司
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Problems solved by technology
[0008] Since the bandgap reference generation circuit itself needs to use resistors R1A, R2A, R3A, diodes Q21, Q22, and operational amplifier OP, so many devices, it itself will occupy a large area and power consumption, which eventually leads to the failure of this voltage detection circuit. The design is more complex and consumes more power
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[0021] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0022] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.
[0023] image 3 It is a circuit diagram of the voltage detection circuit 300 in an embodiment of the present invention.
[0024] The voltage detection circuit 300 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a transistor Q1, a transistor Q2, and a comparator CMP.
[0025] The resistor...
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The invention provides a voltage detection circuit. The voltage detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a triode Q1, a triode Q2 and a comparator CMP, wherein the resistor R1 and the resistor R5 are connected between a voltage input terminal VIN and a grounding terminal, an intermediate connection node N1 between the voltage input terminal VIN and the grounding terminal is connected to a second input terminal of a comparator CMP1, and the intermediate connection node N1 is also connected to an emitter of the triode Q1; a collector and a base of the triode Q1 are connected to the grounding terminal; the resistor R2 and the resistor R4 are connected between the voltage input terminal VIN and the grounding terminal, an intermediate connection node N2 between the voltage input terminal VIN and the grounding terminal is connected to a first input terminal of the comparator CMP1, and the intermediate connection node N2 is also connected to an emitter of the triode Q2 via the resistor R3; a collector and a base of the triode Q2 are connected to the grounding terminal. The voltage detection circuit is simple to achieve, saving in chip area and low in power consumption.
Description
[0001] 【Technical field】 [0002] The invention relates to a voltage detection circuit, in particular to a voltage detection circuit whose detection point does not vary with temperature and power supply voltage. [0003] 【Background technique】 [0004] Generally, a voltage detection circuit is required in an integrated circuit system, and one of its functions may be to determine whether the power supply voltage can meet the normal operating voltage of other circuit modules when the power supply is powered on and off. When the power supply voltage is higher than the normal working voltage of other circuit modules, it will output a high potential to turn on other circuit modules. Conversely, when the power supply voltage is lower than the normal operating voltage of other circuit modules, it will output a low potential to turn off other circuit modules. [0005] The voltage detection circuit usually needs to have the characteristic that the detection point does not change with t...
Claims
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IPC IPC(8): G01R19/00
CPCG01R19/0038
Inventor 陆敏
Owner 合肥灿芯科技有限公司