A Linear Power Supply Circuit with Wide Range Input Voltage
A technology for stabilizing power supply circuit and input voltage, which is applied in the direction of high-efficiency power electronic conversion, output power conversion device, DC power input conversion to DC power output, etc., which can solve the problem of reducing the temperature rise of linear power supply, increasing circuit loss, and abnormal Use and other issues
Active Publication Date: 2021-06-18
河南嘉晨智能控制股份有限公司
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Problems solved by technology
When Vin-Vout and Iout are large, in order to prevent overheating of the linear power supply, a power resistor R is often connected in series on the input side of the linear power supply 2 ,like figure 1 As shown in (b), at this time, part of the loss can be transferred to the power resistor, thereby reducing the temperature rise of the linear power supply; but when the input voltage range is further widened and the input-output voltage difference increases or the output current continues to increase, the above Both circuits cannot be used normally due to the sharp increase in loss
Method used
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[0016] Referring to Fig. 2 (a), the linear power supply circuit of the wide-range input voltage that the present invention provides, specific structure is as follows: the resistance R that is connected in series in the linear power supply circuit 2 Divided into 2 resistors R 2a , R 2b , incorporating a semiconductor switching element or relay S 1 in parallel with one of the resistors (here R 2a example).
[0017] By Zener tube D 2 , resistance R 3 Constitute a voltage detection circuit, when the input voltage is higher than the Zener tube D 2 When the regulated value of R 3 The voltage on the rises.
[0018] by R 4 , R 5 , Q 2 , Q 3 Constitute a control circuit, the specific connection method is shown in Figure 2(b), when the input voltage is lower than the regulator tube D 2 When the regulated value of R 3 The upper voltage is 0, Q 2 cutoff, Q 3 conduction, which makes S 1 conduction, R 2a is bypassed, at this time only R 2b In series in the loop, the circui...
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The present invention provides a linear power supply circuit with a wide range of input voltages, which specifically includes a conventional linear regulated power supply circuit, at least a first A resistor (R 2a ) and a first B resistor (R 2b ), a switching element (S 1 ) with the first A resistor (R 2a ) or the first B resistor (R 2b ) wherein one of them is connected in parallel, it is characterized in that: the power supply circuit further includes a voltage detection circuit and a control circuit, when the detection circuit detects that the voltage is higher than a threshold, the control circuit controls the switching element (S 1 ) off, the first A resistor (R 2a ) and a first B resistor (R 2b ) are connected in series to the loop at the same time, thereby reducing the input-output voltage difference of the linear regulated power supply circuit and reducing the calorific value.
Description
technical field [0001] The invention relates to a circuit structure, in particular to a linear power supply circuit with wide range input voltage. Background technique [0002] figure 1 (a) shows an ordinary linear auxiliary power supply, which is widely used in power supply occasions for chips because of its good stability and no electromagnetic interference. Its biggest feature is that the voltage difference between the input voltage and the output The difference in output voltage will cause the linear power supply to heat up too much to provide enough output current. The solution to this problem is to connect resistors in series in the power circuit to reduce the input and output voltage difference of the linear power supply, thereby reducing the heat generation. However, after the resistors are connected in series, when the input voltage is low, the output voltage will decrease accordingly. The voltage range required by the output cannot be reached; therefore, the trad...
Claims
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IPC IPC(8): H02M1/00H02M3/00
CPCH02M1/00H02M3/00H02M1/0003H02M1/0048Y02B70/10
Inventor 江小龙李飞姚欣
Owner 河南嘉晨智能控制股份有限公司