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Inductive load driving circuit

A technology of load driving circuit and switching circuit, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., and can solve the problem of large component size and other problems

Inactive Publication Date: 2010-12-01
AUTONETWORKS TECH LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in this method, a MOSFET or the like inserted in the battery power supply line is used to prevent a large current in reverse battery connection, and a predetermined current flows through the inserted MOSFET in a normal state, which causes unnecessary extra power consumption
Furthermore, in the case where a mechanical relay is used, the component size is unfavorably enlarged

Method used

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Examples

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no. 1 example

[0033] will refer to Figure 1 to Figure 4 A first embodiment according to the present invention will be described. figure 1 is a schematic block diagram of the inductive load drive circuit 10 according to the first embodiment of the present invention, which is in normal battery connection. figure 2 is the timing diagram in normal battery connection. image 3 is a schematic block diagram of the inductive load drive circuit 10 in reverse battery connection. Figure 4 is the timing diagram in reverse battery connection.

[0034] The inductive load driving circuit 10 includes a control circuit 11 , a switch circuit 12 , and a protection circuit 13 . In the present embodiment, the inductive load driving circuit 10 is equipped in an automobile and is connected between the battery Ba and the inductive load M (for example, an engine cooling fan driving motor) so as to operate drive control of the inductive load M.

[0035] For example, the control circuit 11 includes a CPU, and ...

no. 2 example

[0050] will refer to figure 2 , Figure 4 , Figure 5 ,as well as Figure 6 A second embodiment according to the present invention is described. Figure 5 is a schematic block diagram of the inductive load drive circuit 10 of the second embodiment, which is in normal battery connection. Figure 6 is a schematic block diagram of the inductive load drive circuit 10 of the second embodiment, in reverse battery connection. Note that the same configurations as those of the first embodiment will be designated by the same reference numerals, and descriptions will be omitted. Furthermore, since the configuration of the inductive load drive circuit 10 of the second embodiment differs from the first embodiment only in the configuration of the protection circuit, only the difference in the protection circuit will be described.

[0051] Such as Figure 5 As shown in , the protection circuit 13A of the inductive load driving circuit 10 of the second embodiment includes a field effec...

no. 3 example

[0061] Next, we will refer to figure 2 , Figure 4 , Figure 7 ,as well as Figure 8 A third embodiment according to the present invention will be described. Figure 7 is a schematic block diagram of the inductive load drive circuit 10 of the third embodiment, which is in normal battery connection. Figure 8 is a schematic block diagram of the inductive load drive circuit 10 of the second embodiment, in reverse battery connection. Note that the same configurations as those of the first embodiment will be designated by the same reference characters, and descriptions will be omitted. Furthermore, since the configuration of the inductive load drive circuit 10 of the third embodiment differs from the first embodiment only in the protection circuit, only the difference in the protection circuit will be described.

[0062] Such as Figure 7 As shown in , the protection circuit 13B of the third embodiment includes a relay RLY, a first diode (freewheel diode) D3, and a second d...

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PUM

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Abstract

An inductive load drive circuit (10) comprises a control circuit (11) for controlling the switching of a switch circuit (12) and a protective circuit (13). The switch circuit (12) switches conduction and non-conduction of an inductive load (M) when a battery (Ba) is connected normally. When the battery (Ba) is connected reversely, the inductive load (M) can conduct in the opposite direction to that of when the battery (Ba) is connected normally. The protective circuit (13) has at least a current interruption section (Q1) which conducts when the switch circuit (12) switches the operating state of the inductive load (M) from conduction to non-conduction during normal connection of the battery and does not conduct in response to reverse connection when the battery is connected reversely.

Description

technical field [0001] The present invention relates to inductive load driving circuits, or in particular, to inductive load driving circuits including a protection function against reverse battery connection. Background technique [0002] Traditionally, a return circuit of a diode is used as a surge voltage protection circuit in the case where an inductive load is driven. Also, when the current value of the inductive load becomes large, a MOSFET is generally used as a driving device. However, in the case of an inductive load being used in a vehicle, a reverse connection of the battery (power source) is conceivable. In the reverse battery connection, there is a possibility that a large current flows through the body diode (parasitic diode) of the MOSFET and the freewheeling diode to damage the freewheeling diode, MOSFET, and wiring. [0003] Therefore, in order to avoid this trouble in reverse battery connection, for example, as disclosed in Japanese Unexamined Patent Appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/10H02H11/00
CPCH02H11/003H02H9/047
Inventor 木本和宏
Owner AUTONETWORKS TECH LTD
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