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Step-up type switching power supply circuit

A switching power supply circuit, boost type technology, applied in the direction of measuring electricity, short-circuit test, electrical components, etc., can solve problems such as increase in circuit scale

Active Publication Date: 2020-09-04
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to adopt such a method, it is necessary to substantially change and add the circuit of the feedback system, and this causes another problem of a large increase in the circuit scale.

Method used

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  • Step-up type switching power supply circuit
  • Step-up type switching power supply circuit
  • Step-up type switching power supply circuit

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Effect test

no. 1 Embodiment approach

[0033] Below, refer to Figure 1 to Figure 6 The first embodiment will be described.

[0034] figure 1 The illustrated power supply system 1 is applied to a wireless communication ECU called a Data Communication Module (DCM) mounted on a vehicle.

[0035] The power supply system 1 is supplied with a voltage +B from a vehicle battery 2 mounted on a vehicle via an input terminal 3 , and is supplied with a voltage BUB from a backup battery 4 mounted on a vehicle via an input terminal 5 . In addition, backup battery 4 includes, for example, a lithium ion battery or the like. The power supply system 1 generates an output voltage Vout serving as a power supply voltage for each configuration of the above-mentioned wireless communication ECU from the voltage +B or the voltage BUB, and outputs it through the output terminal 6 . In addition, the target value of the output voltage Vout is +5V, for example.

[0036] The power supply system 1 includes two power supply circuits 7 and 8 ...

no. 2 Embodiment approach

[0108] Hereinafter, regarding the second embodiment, refer to Figure 7 Be explained.

[0109] Such as Figure 7 As shown, the power supply circuit 22 included in the power supply system 21 of the present embodiment is a step-up switching power supply circuit similar to the power supply circuit 8 of the first embodiment. However, the power supply circuit 22 differs from the power supply circuit 8 in that it has a diode rectification configuration including a diode D21 instead of the transistor Q3.

[0110] In this case, the anode of the diode D21 is connected to the node N1 , and the cathode is connected to the power supply line 10 . The power supply circuit 22 having such a diode rectification configuration can also perform failure detection similar to that of the first embodiment. Therefore, according to this embodiment as well, the same effect as that of the first embodiment can be obtained.

no. 3 Embodiment approach

[0112] Hereinafter, regarding the third embodiment, refer to Figure 8 Be explained.

[0113] Such as Figure 8 As shown, the power supply circuit 32 included in the power supply system 31 of the present embodiment is a step-up switching power supply circuit similar to the power supply circuit 8 of the first embodiment. However, the power supply circuit 32 is different from the power supply circuit 8 in that a current detection unit 33 is provided instead of the current detection unit 19 . The current detection unit 33 has the same configuration as the current detection unit 19 , that is, a resistor R1 and a detection circuit 13 . However, in this case, the comparator CP1 of the detection circuit 13 operates with the ground being the potential on the low potential side of the resistor R1 as a reference potential.

[0114] Also according to the present embodiment described above, the same failure detection as that of the first embodiment can be performed, so the same effects...

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PUM

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Abstract

This step-up type switching power supply circuit (8, 22, 32, 42, 52, 62, 72, 82) is provided with: a step-up control circuit (12) which performs a step-up operation by controlling driving of a switching element (Q4); a failure detection control circuit (15, 64, 83) which controls the driving of the switching element and detects failure of the switching element; a current detection unit (19, 33, 43, 63, 73) which detects a current flowing through the switching element; and a switching unit (16) which performs switching so that one of the step-up control circuit and the failure detection controlcircuit can control the driving of the switching element. Prior to the step-up operation, the switching unit performs switching so that the driving of the switching element is controlled by the failure detection control circuit. The failure detection control circuit on-drives the switching element, and detects an open failure of the switching element on the basis of the result of current detection by the current detection unit.

Description

[0001] Cross-reference of related applications [0002] This application is based on Japanese Application No. 2018-010547 filed on January 25, 2018, the contents of which are cited here. technical field [0003] The present disclosure relates to a step-up switching power supply circuit that performs a step-up operation. Background technique [0004] For example, as disclosed in Patent Document 1, a step-up switching power supply circuit is provided in an electronic control device mounted on a vehicle. In addition, hereinafter, the electronic control unit is also referred to as an ECU, and the step-up switching power supply circuit is also referred to as a step-up power supply. In recent years, as a response to the functional safety of electronic products, the function of self-checking whether there are no parts falling off, failures, etc. during the actual operation of each discrete component including the boost power supply installed in the ECU as a product is required . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/158H02M1/32G01R31/3277G01R31/52H02M1/0009H02M1/08H02M3/156
Inventor 山中豊
Owner DENSO CORP