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Switching power supply unit

A switching power supply and switching element technology, applied in emergency protection circuit devices, output power conversion devices, electrical components, etc., can solve problems such as ineffectiveness, poor overcurrent protection function, and unsatisfactory specifications, and achieve cost suppression Effect

Active Publication Date: 2019-01-29
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in conventional devices that employ such countermeasures, in a single fault state such as an open circuit or a short circuit in a circuit element constituting the overcurrent protection unit, the overcurrent protection function becomes defective and the load is overloaded, such as figure 2 As shown, the output voltage is maintained at the rated voltage without dropping. Since the overcurrent protection function does not work, the output current increases and the output power exceeds 100V·A. As a result, in such a device, Table 1 The specifications of UL1310Class2 cannot be met

Method used

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no. 1 Embodiment approach

[0060] Figure 4 It is a diagram of a switching power supply device 1A according to the first embodiment of the present invention.

[0061] Figure 4 The switching power supply device 1A shown is the converter power supply mode and the background technology mentioned image 3 The same power supply device as the flyback type power supply device has: a transformer T1 having a primary coil Np1 and a secondary coil Ns1 opposite in polarity to the primary coil Np1; a switching element Q1 connected in series to the primary coil Np1; a switching power supply device The output of 1A is a constant voltage control circuit Cont3 that controls the switching operation of the switching element Q1; and the auxiliary coil Np2 wound with the same polarity as the secondary coil Ns2. The voltage generated by the first rectifier element D1 and the capacitor C1 connected in series with the auxiliary coil Np2 in the direction of supplying power when the switching element is turned off is referred...

no. 2 Embodiment approach

[0079] Figure 7 It is a figure of the switching power supply apparatus 1B of 2nd Embodiment of this invention. The difference between the switching power supply device 1B of the second embodiment and the switching power supply device 1A of the first embodiment is that a power limiting unit PLT is provided on the secondary side.

[0080] Figure 7The shown switching power supply device 1B of the second embodiment includes: a transformer T1 having a primary coil Np1 and a secondary coil Ns1 having a polarity opposite to that of the primary coil Np1; a switching element Q1 connected in series to the primary coil Np1; The output of device 1B controls the switching operation of the switching element Q1 in a constant voltage manner and performs the primary side control circuit Cont4 for detection of abnormalities such as overcurrent on the primary side and its protection action, and the voltage value of the auxiliary coil on the secondary side The secondary side control circuit C...

no. 3 Embodiment approach

[0084] Figure 8 It is a figure which shows the switching power supply apparatus 1C of 3rd Embodiment of this invention. In the switching power supply device 1C of the third embodiment, the auxiliary winding Ns3 in the switching power supply device 1B of the second embodiment, the fourth rectifying element D4 connected in series to the auxiliary winding Ns3 , and the fourth The capacitor C4 connected to the rectifying element D4 is moved to the primary side. That is, the primary side includes an auxiliary winding Np3, a fifth rectifying element D5 connected in series to the auxiliary winding Np3, and a capacitor C2 connected to the fifth rectifying element D5. The primary-side control circuit Cont3 of the switching power supply device 1C of the third embodiment includes a voltage control function, an overcurrent protection unit OCP, and a power limiting unit PLT. The power limiting unit PLT monitors the voltage Vcc3 of the capacitor C2, and controls the switching element Q1 ...

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Abstract

The invention provides a switching power supply device which is low in price and can ensure actual security. The flyback switching power supply device comprises a transformer with a primary coil and a secondary coil, a switching element connected with the primary coil, a control circuit for feeding back output voltage to control closing and opening of the switching element in a mode with the output voltage of the switching power supply device as a certain value, a first auxiliary coil providing power for the control circuit and wound with the same polarity as the secondary coil, a first rectifying element in serial connection with the first auxiliary coil in the power supply direction when the switching element is opened, and a first capacitor for smoothing AC power supplied from the first rectifying element. A voltage value which is generated by the first capacitor and is increased proportionate to the output current or the output power is detected, and an output current value or the output power value is thus calculated.

Description

technical field [0001] The present invention relates to an isolated power supply device in which either one of the maximum output power and the maximum output current of the power supply device is limited in order to improve safety. Background technique [0002] Generally, electrical equipment is connected to a commercial AC power supply or a DC power supply such as a battery. A power supply unit is built into these devices, and the power supply unit converts a connected power supply into a necessary voltage so that a desired current can be obtained. In these power supply devices, the output power or maximum current obtained from the power supply device is below the rated power and rated current during normal operation, but in the case of overload or short circuit, etc., it is possible to get more than the rated power of the power supply. and rated current. In this case, the loss inside the power supply device increases, and ignition or smoke may occur, which may cause a f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/32H02H7/12
Inventor 彭李钢张英杰
Owner TDK CORPARATION
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