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A voltage and current control mode automatic switching circuit and method

A control mode, automatic switching technology, applied in control/regulation systems, electrical variables, instruments, etc., can solve problems such as difficult adjustment, output overshoot, large output duty cycle, etc., to achieve the effect of performance improvement

Active Publication Date: 2021-08-24
XIAN MICROELECTRONICS TECH INST
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest advantage of current-type control is to ensure that the circuit can be protected instantly when over-current occurs, but the output duty ratio is usually large at the moment of power-on, causing output overshoot, and it is difficult to adjust; voltage-type control is relatively simple and easy Debugging, but the protection speed is slow when the input overcurrent occurs

Method used

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  • A voltage and current control mode automatic switching circuit and method

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Embodiment Construction

[0018] The present invention is described in further detail below in conjunction with accompanying drawing:

[0019] Such as figure 1 As shown, it is the voltage-current control mode automatic switching circuit according to the present invention, which includes a current transformer L1, a transistor Q1 and a chip U1.

[0020] The chip U1 adopts the current type pwm control chip, and the model of the chip U1 is UC1825.

[0021] The first output end of the current transformer L1 is sequentially connected to the first end of the resistor R7, the resistor R8, the capacitor C1, the capacitor C3, the capacitor C4, the resistor R9, the resistor R10 and the resistor R11 and grounded, and the second output end of the current transformer L1 is sequentially The second end of resistor R7, resistor R8, capacitor C1 and resistor R9 is connected, the second end of resistor R7 is connected with the anode of diode V1, the cathode of diode V1 is connected with the second end of resistor R8; th...

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Abstract

The invention discloses a voltage and current control mode automatic switching circuit and method including a current transformer L1, a triode Q1 and a chip U1; a resistor R6 is connected between the second end of the resistor R8 and the second end of the capacitor C1, and the second end of the capacitor C1 A resistor R5 is connected between the second end of the resistor R9, the second end of the capacitor C1 is connected to the RAMP of the chip U1 through the resistor R3, the second end of the capacitor C3 is connected to the CT of the chip U1, and the emitter of the transistor Q1 is connected to the chip through the resistor R2 The RAMP of U1; the collector of the transistor Q1 is connected to the Vref of the chip U1; the base of the transistor Q1 is connected to the CT of the chip U1, and the base of the transistor Q1 is connected to the RAMP pin of the chip U1 through the resistor R1, and the resistance of the resistor R1 is at least 5 times the resistance of R2. The circuit has the comprehensive advantages of current-type control and voltage-type control, and the performance of the power supply has been greatly improved.

Description

technical field [0001] The invention belongs to the field of circuit control, and relates to a voltage and current control mode automatic switching circuit and a method. Background technique [0002] At present, there are two control methods using analog circuits: voltage control type and current control type, both of which have their own advantages and disadvantages. The biggest advantage of current-type control is to ensure that the circuit can be protected instantly when over-current occurs, but the output duty ratio is usually large at the moment of power-on, causing output overshoot, and it is difficult to adjust; voltage-type control is relatively simple and easy Debugging, but the protection speed is slow when the input overcurrent occurs. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a voltage-current control mode automatic switching circuit and method, so that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/625
CPCG05F1/625
Inventor 范喆张宏科
Owner XIAN MICROELECTRONICS TECH INST
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