Low-voltage detection circuit
A detection circuit and low-voltage technology, which is applied in the field of low-voltage detection circuits, can solve the problems of high cost, large space, and occupation of comparators
Inactive Publication Date: 2012-10-31
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology
[0002] Generally, most of the low-voltage detection circuits designed on the market are designed with components such as comparators. Comparators are costly and occupy a large space.
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[0010] Below in conjunction with accompanying drawing and preferred embodiment the present invention is described in further detail:
[0011] Please refer to figure 1 , a low voltage detection circuit is used to detect whether the voltage of a power supply VCC is lower than a set value. A preferred embodiment of the low voltage detection circuit includes a Zener diode D1, a diode D2, transistors Q1, Q2 and resistors R1-R6.
[0012] The cathode of the Zener diode D1 is connected to the power supply VCC through the resistor R1, and also connected to the anode of the diode D2. The anode of the Zener diode D1 is grounded, the cathode of the diode D2 is grounded through the resistors R2 and R3 in sequence, and the node between the resistors R2 and R3 is connected to the base of the transistor Q1. The emitter of the triode Q1 is grounded, the collector is connected to the power supply VCC through the resistor R4, and is also connected to the base of the triode Q2 through the resis...
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The invention provides a low-voltage detection circuit, which comprises a Zener diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first electronic switch, a second electronic switch and a controller, wherein the cathode of the Zener diode is connected with a power source through the first resistor and also directly connected with one terminal of the second resistor, and the anode of the Zener diode is grounded; the other terminal of the second resistor is grounded through the third resistor; a first terminal of the first electronic switch is connected with a node between the second resistor and the third resistor, a second terminal of the first electronic switch is grounded, and a third terminal of the first electronic switch is connected with the power source through the fourth resistor and also connected with a first terminal of the second electronic switch through the fifth resistor; and a second terminal of the second electronic switch is grounded, and a third terminal of the second electronic switch is connected with the power source through the sixth resistor and also directly connected with the controller. The low-voltage detection circuit can prompt whether the voltage of the power source is lower than a preset value or not through the controller, requires a low cost and occupies relatively small space.
Description
technical field [0001] The invention relates to a low voltage detection circuit. Background technique [0002] Generally, most of the low-voltage detection circuits designed on the market are designed with comparators and other components. The comparators are costly and occupy a large space. Contents of the invention [0003] In view of the above, it is necessary to provide a low-voltage detection circuit with low cost and small footprint. [0004] A low voltage detection circuit, used to detect whether the voltage of a power supply is lower than a preset value, the low voltage detection circuit includes a Zener diode, first to sixth resistors, a first electronic switch, a The second electronic switch and a controller, the cathode of the Zener diode is connected to the power supply through the first resistor, and is also directly connected to one end of the second resistor, the anode is grounded, and the other end of the second resistor is grounded through the third resis...
Claims
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IPC IPC(8): G01R19/165
Inventor 侯全才
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD