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Voltage compensation circuit of switch power line

A line voltage compensation, switching power supply technology, applied in the direction of electrical components, regulating electrical variables, output power conversion devices, etc., can solve the problems of difficult implementation of negative voltage comparison circuits and line voltage compensation circuits, to avoid implementation difficulties and solve problems. Effects that are difficult to achieve with negative currents

Active Publication Date: 2013-11-06
BCD (SHANGHAI) MICRO ELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In view of this, the embodiment of the present invention provides a switching power supply line voltage compensation circuit to solve the problem that the negative voltage comparison circuit and the line voltage compensation circuit are difficult to implement

Method used

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  • Voltage compensation circuit of switch power line
  • Voltage compensation circuit of switch power line
  • Voltage compensation circuit of switch power line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] refer to Figure 5 , Figure 5 It is an implementation mode of the switching power supply line voltage compensation circuit provided by the present invention. Among them, the compensation resistor is R1, and the line voltage feedback module is the second resistor R2 whose two ends are respectively connected to the CS terminal and the FB terminal of the primary side controller. The second resistor R2 is an external resistor, and its resistance value can be adjusted conveniently. . Voltage conversion modules include:

[0051] One end is connected to the internal power supply Vdd of the primary side controller, and the other end is connected to the third resistor R3 connected to the comp input end of the voltage comparator;

[0052] One end is connected to the common end of the third resistor R3 and the voltage comparator comp, and the other end is connected to the fourth resistor R4 connected to the CS end of the primary side controller.

[0053] In the switching powe...

Embodiment 2

[0072] refer to Image 6 , Image 6 It is another implementation manner of the switching power supply line voltage compensation circuit provided by the present invention. Wherein, the compensation resistor is R1, and the line voltage feedback module is a second resistor R2 whose two ends are respectively connected to the CS terminal and the FB terminal of the primary-side controller. Voltage conversion modules include:

[0073] One end is connected to the internal power supply Vdd of the primary side controller, and the other end is connected to the current source Ibias of the voltage comparator comp input;

[0074] One end is connected to the common end of the current source Ibias and the voltage comparator comp, and the other end is connected to the fourth resistor R4 connected to the CS end of the primary side controller.

[0075] In the switching power supply line voltage compensation circuit provided by the embodiment of the present invention, the current source Ibias ...

Embodiment 3

[0088] refer to Figure 7 , Figure 7 It is the third implementation mode of the switching power supply line voltage compensation circuit provided by the present invention. Wherein, the compensation resistor is R1, and the line voltage feedback module is a feedback current I3 proportional to the divided voltage Vfb. Voltage conversion modules include:

[0089] One end is connected to the internal power supply Vdd of the primary side controller, and the other end is connected to the third resistor R3 connected to the comp input end of the voltage comparator;

[0090] One end is connected to the common end of the third resistor R3 and the voltage comparator comp, and the other end is connected to the fourth resistor R4 connected to the CS end of the primary side controller.

[0091] In the switching power supply line voltage compensation circuit provided by the embodiment of the present invention, the voltage conversion module divides the third resistor R3 and the fourth resist...

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Abstract

The invention discloses a voltage compensation circuit of a switch power line. The circuit comprises a first resistor, a compensating resistor, a line voltage feedback module and a voltage conversion module, wherein the first resistor is connected with a negative end of the ground; the compensating resistor is connected between the first resistor and a primary-side controller CS (Circuit Switching) end in series; the line voltage feedback module is arranged between the primary-side controller CS end and a primary-side controller FB (Feed Back) end; one end of the voltage conversion module is connected with the primary-side controller CS end, and the other end of the voltage conversion module is connected with the input end of a voltage comparer in the primary-side controller. The voltage conversion module converts the negative voltage of the primary-side controller CS end into the positive voltage to be supplied to the input end of the voltage comparer; the line voltage feedback module provides a path of current in proportion to the line voltage so as to change the current flow the compensating resistor, thereby changing the voltage drop flowing the compensating resistor and realizing the purpose of voltage compensation. The voltage compensation circuit of the switch power line, disclosed by the invention, keeps constant current output and also solves the problem that a negative pressure comparer and negative current in the circuit are hard to be realized at the same time.

Description

technical field [0001] The invention relates to the technical field of semiconductor circuits, in particular to a switching power line voltage compensation circuit. Background technique [0002] In switching power supply integrated circuits, the reference figure 1 , when the secondary side voltage Vout changes, the voltage on the auxiliary coil will change accordingly, and at the same time the divided voltage Vfb will also change. At this time, the voltage comparator comp detects the change of the divided voltage Vfb, and through the control circuit DRV controls the switch of the power switch tube Q1. Among them, Vref is the threshold value of the voltage comparator. When the voltage comparator comp detects that the voltage across the resistor Rcs rises to Vref, a shutdown signal is generated to turn off the power switch tube Q1, and the shutdown signal is output from the voltage comparator comp until the actual shutdown There is a system delay time Td, which is determined...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/325
Inventor 张美玲郜小茹
Owner BCD (SHANGHAI) MICRO ELECTRONICS LTD
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