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Detection circuit and contactor power saver comprising same

A technology for detecting circuits and contactors, applied in the direction of measuring current/voltage, circuits, relays, etc., can solve the problems of increased contactor turn-off delay, unfavorable promotion of power savers, and large detection delays

Pending Publication Date: 2018-11-16
SHENZHEN NANYUN MICROELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of the filter circuit will cause a certain delay in the detection circuit, which will increase the turn-off delay of the contactor, especially when the input voltage is high, the detection delay will be greater
Not conducive to the promotion of energy saving

Method used

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  • Detection circuit and contactor power saver comprising same
  • Detection circuit and contactor power saver comprising same
  • Detection circuit and contactor power saver comprising same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0029] The first embodiment of the present invention is such as image 3 shown. The input voltage VIN is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the resistor R2, the other end of the resistor R2 is grounded, and the capacitor C1 is connected in parallel to both ends of the resistor R2. The connection point of the resistor R1, the resistor R2 and the capacitor C1 is connected to the negative input terminal of the hysteresis comparator U1, and the positive input terminal of the hysteresis comparator U1 is connected to the reference threshold VREF. The output terminal of the hysteresis comparator U1 outputs a signal CTRL to control the drive circuit for starting and closing the contactor. In order to achieve the purpose of reducing the shutdown of the contactor, a clamping circuit is also included. In this embodiment, the clamping circuit is a Zener diode Z1, and the cathode of the Zener diode is connected to the connection point...

no. 2 example

[0032] The schematic diagram of the second embodiment is as follows Figure 4 As shown, the difference from the first embodiment is that the clamping circuit is different. The clamping circuit of this embodiment consists of a first N-channel MOS transistor, a second N-channel MOS transistor, a first P-channel MOS transistor, and a second N-channel MOS transistor. Composed of two P-channel MOS tubes, the clamping circuit can be implemented in the control chip, which can further reduce the volume and cost of the whole machine, such as Figure 4 The dotted box part in the chip is the circuit inside the chip.

[0033] In this embodiment, in order to achieve the purpose of reducing the shutdown of the contactor, the additional clamping circuit includes N-MOS transistors N1, N2, and P-MOS transistors P1, P2. The source of P1 of the P-MOS is connected to the clamp setting voltage VCLAMP, the gate and drain of P1 are connected to the gate of P2 and the drain of N1, and the source of ...

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PUM

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Abstract

The present invention discloses a detection circuit and a contactor power saver comprising the same. The detection circuit adds a clamp circuit on the basis of the prior art, the clamp circuit restricts a voltage of an input end of a comparison output circuit to a certain set value to allow the time of dropping the voltage of the comparison output circuit to a triggering threshold value to be faster when the contactor is switched off, namely, the bus voltage input by the detection circuit input port is cut off, the output port of the detection circuit outputs control signals to control the time of closing the contactor power saver to be shorter to allow the switch-off delay of the occasion contactor input in a high voltage to be controlled and allow the switch-off delay of the contactor incondition of a high / low voltage inputting the voltage to be consistent.

Description

technical field [0001] The invention relates to the field of a contactor power saver, in particular to an input voltage detection circuit of a contactor power saver. Background technique [0002] With the rapid development of electronic technology, the application of contactor power savers is becoming more and more extensive. The contactor power saver can significantly reduce the loss of the contactor, but it also brings another problem. After using the contactor power saver, the delay time for the contactor to turn off will be longer. Usually, the turn-off delay of a contactor without a power saver is about 50ms, while the turn-off delay of a contactor with a power saver is greater than 100ms, or even more than 200ms. The turn-off delay of the contactor without a power saver is mainly caused by mechanical inertia, and the contactor with a power saver is not only mechanical inertia, but also the slow decay of the coil current and the delay of input voltage detection are tw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00H01H47/18
CPCH01H47/18G01R19/0084
Inventor 苏俊熙符威
Owner SHENZHEN NANYUN MICROELECTRONICS CO LTD
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