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A switch power supply device

A switching power supply and switching element technology, applied in the output power conversion device, electrical components, regulating electrical variables and other directions, can solve problems such as the inability to obtain peak power

Active Publication Date: 2018-08-28
SANKEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leakage current Id does not flow during the period t3 to t6, so the peak power cannot be obtained

Method used

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  • A switch power supply device
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] figure 1 The switching power supply device of the shown embodiment 1 is characterized in that a control section 7a is provided instead of Figure 8 The control part 7 of the conventional switching power supply apparatus shown. exist figure 1 in, right with Figure 8 The same reference numerals are assigned to the same parts, and description thereof will be omitted.

[0041] Such as figure 2 as shown, figure 1 The control section 7a shown with respect to Figure 8 The shown configuration of the conventional control unit 7 differs in the configuration of the correction current detection signal generation unit 40a. The correction current detection signal generation unit 40a has a ramp voltage generation circuit 41, a reference voltage source Vr1, an adder 51, and a correction circuit 42a.

[0042] The correction current detection signal generation unit 40a responds to the signal indicating the timing of the start of the conduction of the switching element 3 in the ...

Embodiment 2

[0056] Figure 5 It is a detailed circuit diagram of the control unit 7b provided in the switching power supply device of the second embodiment. Figure 6 yes Figure 5 A detailed circuit diagram of the adder 51a, the switch SW and the correction circuit 42b is shown. The correction current detection signal generation unit 40b included in the control unit 7b has a ramp voltage generation circuit 41, a reference voltage source Vr1, an adder 51a, a switch SW connected to the reference voltage source Vr1 and the adder 51a, and a correction circuit 42b.

[0057] In addition, the control unit 7b has a duty ratio detection circuit 52 that detects the duty ratio, turns on the switch SW when the duty ratio is smaller than a predetermined value, and turns on the switch SW when the duty ratio is a predetermined value. The switch SW is turned off during the period above the value.

[0058] Specifically, the duty ratio detection circuit 52 is connected to the output terminal of the NOR...

Embodiment 3

[0064] Figure 7 It is a detailed circuit diagram of the control unit 7c provided in the switching power supply device according to the third embodiment of the present invention. The corrected current detection signal generating unit 40c included in the control unit 7c includes a ramp voltage generating circuit 41, a reference voltage source Vr1, an adder 51b, a switch SW connected to the reference voltage source Vr1 and the adder 51b, and a correction circuit 42c.

[0065] The correction current detection signal generating unit 40c responds to the signal indicating the conduction start timing of the switching element 3 in the on / off control signal forming circuit 24, and when the input voltage is lower than a predetermined voltage, generates a signal from the switching element 3 A first correction signal having a constant value is formed during a period in which the duty ratio is smaller than a predetermined value from the conduction start time of , and a time elapsed from th...

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PUM

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Abstract

The invention provides a switch power supply device which can obtain peak power even under low input voltage. The switch power supply device comprises an ON / OFF control signal forming circuit (24) which controls output voltage to be a constant ON / OFF control signal according to the output voltage detected by an output voltage detection unit (6) and supplies the signal to a switch element (3); a correction current detection signal generation unit (40a) which, in response to a signal representing an ON start moment of the switch element in the ON / OFF control signal forming circuit, forms a firstcorrection signal with a constant value in a period with the duty ratio being less than a predetermined value from the ON start moment of the switch element, forms a second correction signal that isincreased from the value of the first correction signal with the lapse of time in a period with the duty ratio being greater than the predetermined value, and generates a correction current detectionsignal by subtracting the first correction signal and the second correction signal from a current detection signal.

Description

technical field [0001] The present invention relates to switching power supply devices such as DC-DC converters. Background technique [0002] Such as Figure 8 As shown, the conventional switching power supply device has a switching element 3 , an output rectifying and smoothing circuit 4 , an output voltage detecting circuit 6 , a control unit 7 , a rectifying and smoothing circuit 8 for control power supply, a control power supply circuit 9 and a current detection resistor 10 . The transformer 2 has a primary coil N1, a secondary coil N2, and a tertiary coil (control power supply coil) N3. [0003] The output rectification smoothing circuit 4 has a rectification diode 4a and a smoothing capacitor 4b, and the smoothing capacitor 4b is connected in parallel to the secondary coil N2 via the rectification diode 4a. The control power supply rectification smoothing circuit 8 has a rectification diode 8a and a smoothing capacitor 8b, and supplies a DC voltage to the control uni...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33569
Inventor 早川章田畠铁哉小池宪吾
Owner SANKEN ELECTRIC CO LTD
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