Method for realizing input undervoltage and over-temperature protection based on over voltage protection (OVP) function of Boost control chip
A control chip, input undervoltage technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as affecting load use, AC mains instability, power supply damage, etc., to achieve low cost, simple and stable circuit structure. good effect
Inactive Publication Date: 2011-06-01
MOSO POWER SUPPLY TECH
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Problems solved by technology
The AC mains usually produces instability. When the DC voltage after AC / DC conversion is undervoltage, it will affect the use and load performance of the load. In the AC / DC converter and power supply circuit in the prior art, Usually does not have input undervoltage protection function, which affects the use of load
Moreover, when the load fails or the ambient temperature is too high, it is easy to damage the power supply
Method used
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[0015] This embodiment is a preferred implementation mode of the present invention, and other principles and basic structures that are the same or similar to this embodiment are within the protection scope of the present invention.
[0016] Please see attached figure 1 , the AC mains power is converted into a DC power supply through an AC / DC converter for power supply, and the output of the DC power supply includes two electrode outputs of a positive pole and a negative pole. In this embodiment, the positive pole of the DC power output is connected in series with an inductor L1 and a diode D2, L1 is connected between the thermistor RT1 and the source of the field effect transistor Q1, and the diode D2 is connected between the source of the field effect transistor Q1 and the resistor R9. The circuit in the present invention includes a thermistor RT1, a resistor R2, and a resistor R1 connected in series between the positive pole and the negative pole of the DC power output in se...
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The invention provides a method for realizing input undervoltage and over-temperature protection based on an over voltage protection (OVP) function of a Boost control chip, and the method is characterized in that a thermistor RT1, a resistor R2 and a resistor R1 are sequentially connected in series between the positive and negative poles of direct-current (DC) power output; the public node of the resistor R2 and the resistor R1 is connected with the grid of a field-effect tube Q2; the source electrode of the field-effect tube Q2 is earthed; the drain electrode of the field-effect tube Q2 is connected with the positive pole of the DC power output by means of a resistor R6, a resistor R7 and a resistor R9 which are connected in serials; the public node of the resistor R6 and the resistor R7 is connected with the OVP pin of the Boost control chip; the driver pin of the Boost control chip is connected with the grid of a field-effect tube Q1; the source electrode of the field-effect tube Q1 is earthed by means of the resistors; and the drain electrode of the field-effect tube Q1 is connected with the positive pole of the DC power output. The method has the advantages that the circuit structure is simple, the implementation cost is lower, and the stability is good.
Description
technical field [0001] The invention discloses a method for input undervoltage and overtemperature protection, in particular a method for realizing input undervoltage and overtemperature protection based on the existing overvoltage protection (OVP) function pin of a Boost control chip. Background technique [0002] In a DC power supply circuit, AC mains power is usually converted into DC power through an AC / DC converter for power supply. The AC mains usually produces instability. When the DC voltage after AC / DC conversion is undervoltage, it will affect the use and load performance of the load. In the AC / DC converter and power supply circuit in the prior art, Usually there is no input undervoltage protection function, which affects the use of the load. Moreover, when the load fails or the ambient temperature is too high, it is easy to damage the power supply. Contents of the invention [0003] In view of the lack of input under-voltage protection and over-temperature pro...
Claims
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IPC IPC(8): H02H7/125
Inventor 顾永德苏周王永彬唐开锋
Owner MOSO POWER SUPPLY TECH