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Pulsewidth modulator for controlling electricity saving mode by output voltage feedback delay circuit

A technology of feedback delay and circuit control, which is applied in the direction of control/regulation system, irreversible AC power input conversion to DC power output, and adjustment of electrical variables, etc., which can solve the problems of overall efficiency reduction and achieve good efficiency.

Inactive Publication Date: 2006-06-14
NIKO SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the electronic product is under light load or no load, if the switching action of the switch is still controlled by pulse width modulation (PWM) technology, the conduction loss will decrease because the electronic product is under light load, but due to the operating frequency of the switch Constant, so the switching loss will not decrease as the load decreases, so at light load, the overall efficiency will decrease when using the pulse width modulation (PWM) technology working mode

Method used

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  • Pulsewidth modulator for controlling electricity saving mode by output voltage feedback delay circuit
  • Pulsewidth modulator for controlling electricity saving mode by output voltage feedback delay circuit
  • Pulsewidth modulator for controlling electricity saving mode by output voltage feedback delay circuit

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Embodiment Construction

[0053] Fig. 5 is a schematic circuit diagram of the present invention. The pulse width modulation device 3 of the present invention can follow the load change of the power supply, and then control and output a drive signal Drv to the power switch Q, including: a delay comparison circuit 32, a pulse width modulation control unit 34, and an OR gate The circuit 36 ​​and a synchronization signal output unit 38 .

[0054] Figure 5 shows that the pulse width modulation device 3 of the present invention receives a feedback voltage VFB from the load end of the power supply, and at the same time uses a DC power supply VDD to transmit power to two serially connected first resistors R1 and the second through a resistor R3. Two resistors R2, and through the two resistors R1 and R2 connected in series, divide the electric power to obtain a high threshold voltage Vthhigh and a low threshold voltage Vthlow respectively.

[0055] Furthermore, the delay comparison circuit 32 intercepts the fe...

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Abstract

This invention discloses a pulse width modulation device for controlling the electricity-save mode utilizing an output voltage feedback delay circuit used in a supply supplier to follow the change of a load to further control to output a drive signal including: a delay comparing circuit extracting a feedback voltage, a high critical voltage and a low critical voltage to output a blanking signal after the comparison and delay operation on them, a pulse width modulation control unit extracting a current feedback signal and said feedback voltage to output a modulation signal after the internal comparison operation, an OR gate circuit connecting to said delay comparing circuit and the pulse width modulation control unit, receiving said blanking signal and said modulation signal to output a reset signal and a synchronous signal output unit connected to said OR gate circuit, receiving said reset signal and an oscillation signal for outputting said drive signal.

Description

technical field [0001] The invention relates to a pulse width modulation device using an output voltage feedback delay circuit to control a power saving mode, in particular to a pulse width modulation device used in a power supply to follow load changes and then control an output driving signal. Background technique [0002] In many low-power output applications, such as chargers for mobile phones, wireless phones, digital cameras, and PDAs, as well as AC voltage regulators for printers, video games, and handheld walkmans, the requirements for power saving during standby are quite high. height of. [0003] According to the currently known DC power supply devices, such as AC To DCSwitching Power Supply (AC To DCSwitching Power Supply), in order to reduce the size of the transformer, most of them use high-frequency pulse width modulation (PWM, abbreviated as pulse width modulation) control DC output voltage, such as figure 1 Shown is a schematic circuit diagram of an existin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/02G05F1/10
Inventor 吴俊政
Owner NIKO SEMICON
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