CN202219763U - Lower-edge driving circuit with secondary turn-off protection capability - Google Patents
Lower-edge driving circuit with secondary turn-off protection capability Download PDFInfo
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- CN202219763U CN202219763U CN2011203513595U CN201120351359U CN202219763U CN 202219763 U CN202219763 U CN 202219763U CN 2011203513595 U CN2011203513595 U CN 2011203513595U CN 201120351359 U CN201120351359 U CN 201120351359U CN 202219763 U CN202219763 U CN 202219763U
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- driving circuit
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- secondary turn
- driving
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Abstract
The utility model discloses a lower-edge driving circuit with a secondary turn-off protection capability, which comprises an amplifying circuit, a driving circuit, a feedback circuit and an analog dialogue (AD) detection circuit, wherein the amplifying circuit and the AD detection circuit are both connected with a microprogrammed control unit (MCU), the amplifying circuit is connected with the driving circuit which is connected onto a load, a high edge of the load is connected with a power source, and the feedback circuit is respectively connected with the amplifying circuit and the driving circuit. The standard lower-edge driving circuit is provided for the small power load, the existing intelligent power chip driving mode is changed, cost is reduced to the maximum extent, and the secondary turn-off protection capability is added on the basis of overcurrent protection and short circuit protection capabilities, so that cost performance of the lower-edge driving protection circuit is greatly improved.
Description
Technical field
The utility model belongs to auto body controller technology field, is mainly used in the low limit driving circuit of low-power load, relates to circuit theories such as amplifier, feedback, detection, is specifically related to a kind of low limit driving circuit with secondary turn-off protection ability.
Background technology
Along with the fast development and the keen competition of Automobile Electronic Industry, cost-cutting is the key point of automobile BCM exploitation under the prerequisite of guaranteeing product function and performance.Car body controller (BCM) requires all outputs all should have overcurrent, short-circuit protection ability.At present; Drive low-power load (like the outer relay line bag of pcb board, various indicator lamps etc.) the intelligent power chip for driving that adopt more; These power drive chips basically all are the import devices; Cost an arm and a leg and procurement cycle long, can't satisfy batch manufacturing and needs cheaply, this just need design the driving circuit that has protective capability cheaply.
The utility model content
The purpose of the utility model provides a kind of low limit driving circuit with secondary turn-off protection ability; The low limit Drive Protecting Circuit of a standard is provided for low-power load; Change existing smart power chip drive pattern; Cost-cutting farthest, and on the basis of overcurrent, short-circuit protection, increase secondary turn-off protection ability, greatly put forward the cost performance of high-low side Drive Protecting Circuit.
To achieve these goals, the utility model adopts following technical scheme:
A kind of low limit driving circuit with secondary turn-off protection ability; Wherein, comprise amplifying circuit, driving circuit, reactive circuit and AD testing circuit, said amplifying circuit all is connected with MCU with the AD testing circuit; Amplifying circuit connects driving circuit; Driving circuit is connected in the load, and the flash power connection of load, described reactive circuit are connected with driving circuit with amplifying circuit respectively.
Further, described amplifying circuit is a transistor amplifier.
Further, described driving circuit is a transistor drive circuit.
Further, described reactive circuit is an aerotron reactive circuit.
The beneficial effect of the utility model is:
Whether it is exactly the flash power connection of load that low limit drives, decide load to work through controlling low limit.The utility model is the low limit Drive Protecting Circuit that low-power load provides a standard; Change existing smart power chip drive pattern; Cost-cutting farthest; And on the basis of overcurrent, short-circuit protection, increase secondary turn-off protection ability, greatly put forward the cost performance of high-low side Drive Protecting Circuit.The utility model is portable strong, on any a automobile BCM, uses after can revising partial parameters as required, has improved product development rate and work efficiency, has shortened the Products Development cycle, has reduced cost of development.
Description of drawings
Fig. 1 is the circuit block diagram of the utility model;
Fig. 2 is the schematic circuit diagram of the utility model.
The specific embodiment
Below through circuit analysis is done further description to the utility model design:
Like Fig. 1, shown in Figure 2; The circuit of the utility model comprises MCU1, amplifying circuit 2, driving circuit 3, load 4, reactive circuit 5 and AD testing circuit 6; Amplifying circuit 2 all is connected with MCU1 with AD testing circuit 6, and amplifying circuit 2 connects driving circuit 3, and driving circuit 3 is connected in the load 4; The flash power connection of load 4, reactive circuit 5 are connected with driving circuit 3 with amplifying circuit 2 respectively.
As shown in Figure 2, compositions such as this circuit transistor amplifier Q203, transistor drive circuit Q204, aerotron reactive circuit Q202 and AD testing circuit.When MCU exports a high level signal, transistor amplifier Q203 conducting work, also conducting work of transistor drive circuit Q204 immediately, the load energising is started working; Excessive like electric current in the load circuit, aerotron reactive circuit Q202 conducting is closed, turns off transistor amplifier Q203 and transistor drive circuit Q204 then, and the load outage realizes protection.
Load outage back aerotron reactive circuit Q202 breaks off, and still exports a high level like MCU, and then transistor amplifier Q203 and transistor drive circuit Q204 open in succession, the load energising; Excessive or short circuit phenomenon arranged like electric current in the load circuit, aerotron reactive circuit Q202 conducting is closed, and the load outage realizes protection then, just so back and forth can form oscillating circuit.Reach the power drive requirement through the dual amplifier of aerotron, the front end aerotron can adopt the regular tap aerotron, and the rear end drives aerotron will use high-performance power discharging transistor; Detect the overcurrent condition in the load circuit through the AD testing circuit, thereby the high level of turning off MCU output avoids circuit to form vibration; Circuit not only has instantaneous hard protective capabilities such as overcurrent, short circuit, also has the AD detection and turns off the secondary turn-off protection ability of output.
Explanation is at last; Above embodiment is only unrestricted in order to the technical scheme of explanation the utility model; Other modifications that those of ordinary skills make the technical scheme of the utility model perhaps are equal to replacement; Only otherwise break away from the spirit and the scope of the utility model technical scheme, all should be encompassed in the middle of the claim scope of the utility model.
Claims (4)
1. low limit driving circuit with secondary turn-off protection ability; It is characterized in that: comprise amplifying circuit, driving circuit, reactive circuit and AD testing circuit; Said amplifying circuit all is connected with MCU with the AD testing circuit, and amplifying circuit connects driving circuit, and driving circuit is connected in the load; The flash power connection of load, described reactive circuit are connected with driving circuit with amplifying circuit respectively.
2. a kind of low limit driving circuit with secondary turn-off protection ability according to claim 1, it is characterized in that: described amplifying circuit is a transistor amplifier.
3. a kind of low limit driving circuit with secondary turn-off protection ability according to claim 1, it is characterized in that: described driving circuit is a transistor drive circuit.
4. a kind of low limit driving circuit with secondary turn-off protection ability according to claim 1, it is characterized in that: described reactive circuit is an aerotron reactive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203513595U CN202219763U (en) | 2011-09-20 | 2011-09-20 | Lower-edge driving circuit with secondary turn-off protection capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203513595U CN202219763U (en) | 2011-09-20 | 2011-09-20 | Lower-edge driving circuit with secondary turn-off protection capability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202219763U true CN202219763U (en) | 2012-05-16 |
Family
ID=46041796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203513595U Expired - Fee Related CN202219763U (en) | 2011-09-20 | 2011-09-20 | Lower-edge driving circuit with secondary turn-off protection capability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202219763U (en) |
-
2011
- 2011-09-20 CN CN2011203513595U patent/CN202219763U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120516 Termination date: 20130920 |