A kind of internal and external battery detection circuit for three-phase electric meter
A technology for battery detection and three-phase electric meters, which is applied in the direction of measuring electricity, measuring devices, and measuring electric variables, etc., can solve the problems of increasing battery power consumption, reducing battery life, and failing to meet the requirements of battery power consumption. Effect of reducing power consumption and increasing service life
Active Publication Date: 2019-04-12
NINGBO SANXING MEDICAL & ELECTRIC CO LTD
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[0003] Today's three-phase meters use intermediate-frequency MCUs, such as G80F935, due to transformer and cost reasons. However, this type of MCU only has two interrupt ports, one of which must be multiplexed as the internal temperature sensor power interface. Some battery detection circuits will turn on the temperature sensor connected to it when the battery detection signal is given. When the temperature sensor is turned on, it will cause the consumption of battery voltage, increase the power consumption of the battery, and reduce the service life of the battery. Due to the requirements of battery power consumption in some countries, it is impossible to enter the market of this country
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[0010] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0011] See Figure 1 to Figure 2 , an internal and external battery detection circuit for a three-phase electric meter, including a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7 , the eighth resistor R8, the first capacitor C1, the first diode VD1, the second diode VD2, the first transistor V1 and the second transistor V2, one end of the first resistor R1 is used for series connection An external battery GB1, one end of the fourth resistor R4 is used to connect the built-in battery GB2 in series; the other end of the first resistor R1 is connected to the anode of the first diode VD1, and the other end of the fourth resistor R4 is connected to the first The anode of the second transistor VD2, the cathode of the first diode VD1 and the catho...
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The invention discloses a circuit for detecting internal and external batteries of a three-phase electric meter. Signals are sent to a first triode and a second triode through a single-chip microcomputer, which are used for controlling turning-off and turning-on of the triodes; when the first triode is turned on, the external battery is detected, and when the second triode is turned on, the internal battery is detected; and after turning-on, the signals are sent to an interruption port of the single-chip microcomputer after detection of a detection resistor and filtering of a first capacitor. Thus, only one interruption port is needed and the detection of the internal and external batteries is completed, an internal temperature sensor is not started, power consumption is reduced, and the service lives of the batteries are prolonged.
Description
technical field [0001] The invention relates to the field of battery detection, in particular to an internal and external battery detection circuit for a three-phase electric meter. Background technique [0002] The three-phase electric meter is an instrument used to measure electric energy, and it is used in many countries at home and abroad; it needs to be driven by its own battery, but because of the different national conditions in overseas countries, some regulations require an external battery, and some regulations require a built-in Batteries, there are also some regulations that built-in and external batteries must be available, and no matter the external battery or the built-in battery, the voltage of the battery needs to be detected. [0003] Today's three-phase meters use intermediate-frequency MCUs, such as G80F935, due to transformer and cost reasons. However, this type of MCU only has two interrupt ports, one of which must be multiplexed as the internal tempera...
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IPC IPC(8): G01R31/385
CPCG01R31/382
Inventor 王斌
Owner NINGBO SANXING MEDICAL & ELECTRIC CO LTD