Switching power supply control circuit having loop compensation function
A switching power supply and control circuit technology, applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as control system failure, circuit damage, and phase angle reduction, so as to improve work performance, prevent switch tube damage, and protect the environment. The effect of road stabilization
Inactive Publication Date: 2018-05-04
XIAN XJ POWER ELECTRONICS TECH
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Problems solved by technology
And as the switching frequency increases, the transfer function gain increases accordingly, but the phase angle will decrease. If it is not filtered out (compensated), positive feedback will be formed, which will invalidate the control system of the entire switching power supply and cause damage to the entire circuit.
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[0028] see figure 2 , the conventional loop compensation circuit has three modes, which are single-pole compensation circuit, double-pole compensation circuit, and three-pole compensation circuit.
[0029] a. The single-pole compensation circuit is composed of a capacitor C1, and the transfer function is:
[0030]
[0031] It is suitable for the power supply with current control type control and circuit working in DCM mode and the ESR zero frequency of the filter capacitor is low, also called main pole compensation.
[0032] b. The double-pole compensation circuit is composed of a resistor R2 and two capacitors C1 and C2, and its transfer function is:
[0033]
[0034] It is suitable for compensation with only one pole in the power section, such as all current mode control and discontinuous mode control.
[0035] c. The three-pole compensation circuit is composed of two resistors R2, R3 and three capacitors C1, C2, and C3, and its transfer function is:
[0036]
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The invention discloses a switching power supply control circuit having a loop compensation function. The switching power supply control circuit includes a control chip where an amplifier is integrated. A resistance-capacitance network double-pole compensation circuit is connected between a first pin and a second pin of the control chip, and the resistance-capacitance network double-pole compensation circuit is connected with a first resistor and a second resistor to be used for sampling signals. A soft-start circuit is connected between the first pin and an eighth pin of the control chip; anoscillating circuit is connected between the eighth pin and a fourth pin of the control chip, and a sixth pin of the control chip is connected with a switching tube. A third pin is connected with an RC filter circuit composed of a resistor and a capacitor. A seventh pin of the control chip is connected with a VCC. A fifth pin of the control chip is in grounded connection. Compensation is made fora control loop of a switching power supply through the double-pole compensation circuit. The circuit is simple and ingenious in design, the reliability of the operation of the switching power supply control circuit is ensured, and the switching power supply control circuit is simple in structure and low in cost and can improve the working performance, safety and reliability of an entire system.
Description
technical field [0001] The invention belongs to the technical field of switching power supply control, and in particular relates to a switching power supply control circuit with loop compensation. Background technique [0002] Switching Mode Power Supply (Switching Mode Power Supply), also known as switching power supply, switching converter, is a high-frequency power conversion device. Its function is to convert a level of voltage into the voltage or current required by the user through different forms of architecture. [0003] Switching power supply is a kind of power supply that uses modern power electronic technology to control the time ratio of switching on and off to maintain a stable output voltage. Switching power supply is generally composed of pulse width modulation (PWM) control IC and MOSFET. With the development and innovation of power electronics technology, switching power supply technology is constantly innovating. At present, switching power supply is wide...
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Login to View More IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0003
Inventor 徐关澄孟向军梅桂芳吕淼董晓帅杨欣然孙亮牛化鹏吴金龙张海龙姚为正
Owner XIAN XJ POWER ELECTRONICS TECH