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Tentative overcurrent protection circuits for external loads of power harvesting equipment
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An overcurrent protection circuit and external load technology, applied in the protection of overcurrent reactions, can solve problems such as energy waste, slow recovery speed, overheating and burning of electric energy meters, etc., to avoid repeated oscillations, enhance reliability, and recover fast effect
Active Publication Date: 2018-07-17
WAHLAP TECH CO LTD
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Abstract
Description
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Problems solved by technology
There are two main defects: 1) If the abnormal load is not ruled out, the electronic circuit will be in an overload state for a long time, and all the overload power will generate a high heat source inside the electric energy meter, which will cause the internal temperature of the electric meter to rise, reduce the reliability of the electric energy meter, and cause waste of energy
Even in a high-temperature environment, it will cause overheating and burning of the electric energy meter; 2) The recovery speed is slow. When the load is abnormally removed, the heat of the internal electronic devices needs to be dissipated slowly, and it takes tens of minutes or even Longer time, unable to return to normal immediately
Method used
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Embodiment 1
[0016] Example 1: In figure 1 Among them, a load overcurrent protection circuit is used for over / undercurrent control of the external load ELD, which is set between a load power supply terminal VCC and several ground terminals (for example, figure 1 The two ground terminals GND_A and GND_B shown in ), where the circuit mainly includes:
[0017] The voltage sampling part R8 set close to the ground terminal GND_A, or an alternative similar impedance device, is used to convert the current I flowing from GND_A to GND_B into a voltage, that is, at figure 1 Converted to the first voltage signal V4 in the illustrated embodiment;
[0018] The voltage doubler conversion part connected to the voltage sampling part R8 includes an operational amplifier U1:1, and the voltage sampling part R8 is connected to the non-inverting input terminal INA+ of the operational amplifier U1:1 to input the first voltage signal V4. Its inverting input terminal INA- is respectively connected to the voltag...
Embodiment 2
[0030] Embodiment 2: The power collection device implemented based on Embodiment 1 is equipped with a load power supply terminal that transmits DC current to its external load; and the load overcurrent protection circuit described in Embodiment 1.
[0031] In one embodiment, the external load 10 comprises an integrated circuit that is functionally paired with the power harvesting device.
Embodiment 3
[0032] Embodiment 3: refer also to figure 1 , a tentative load overcurrent protection circuit is designed similarly to Embodiment 1, which is arranged in a power collection device, and is used to periodically detect whether the external load 10 is overcurrent after a certain period of time when the internal or external load 10 is overcurrent. To restore the current state, the circuit includes: a DC current path connected between the load power supply end and the load, and several grounding ends; The DC current signal flowing between the several ground terminals is used to control the on-off of the DC current path multiple times, wherein the test voltage detection part includes:
[0033] a voltage sampling unit R8 disposed close to the ground terminal GND_A, configured to collect a DC current signal flowing between the ground terminals GND_A and GND_B and convert it into a first voltage signal V4;
[0034] The voltage doubler conversion section connected to the voltage samplin...
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Abstract
One embodiment of the invention provides a load over-current protection circuit through design, and the load over-current protection circuit is used for over-current / under-current control of an external load of electric power acquisition equipment. The load over-current protection circuit is arranged between a load power supply end and multiple grounding ends. The load over-current protection circuit comprises a voltage sampling part which is arranged to be close to the grounding ends and used for acquiring a DC current signal flowing through the grounding ends and converting the DC current signal into a first voltage signal; a voltage multiplying conversion circuit which is connected with the voltage sampling part and receives the first voltage signal and converts the first voltage signal into a second voltage signal to be outputted; a comparator which receives the second voltage signal via a positive phase input end and compares the second voltage signal with a third voltage signal inputted to the negative phase input end of a return difference comparator so as to output a switch control signal; and an MOS switch which connects or disconnects the path of the external load according to the outputted switch control signal. Correspondingly, another embodiment of the invention provides an over-current protection circuit used for the electric power acquisition equipment through design.
Description
technical field [0001] The embodiments of the present invention relate to power system control technology, more specifically, an overcurrent protection circuit designed to effectively suppress overcurrent and overload of loads designed for power collection equipment (such as electric meters). Background technique [0002] In the general technology in the field related to the present invention, overcurrent and overload protection is required for the load end of the power collection equipment. Usually, on the one hand, a ceramic PTC (positive temperature coefficient) thermistor or a polymer PTC (positive temperature coefficient) thermistor is used to realize overcurrent protection. There are three main defects: 1) The recovery speed of the protection is slow, depending on the degree to which the current exceeds the limit value, it generally takes several seconds or even several minutes to act. Even repeated oscillations cannot achieve protection. The recovery speed is slow. ...
Claims
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Application Information
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