CN209402430U - A kind of two lines bus slave power supply circuit - Google Patents

Abstract

The utility model provides a kind of two lines bus slave power supply circuit, including host, communication module, from machine controller, signal acquisition module, DC/DC module, LDO module, rectification module；The host issues two lines bus signal as input signal, the two lines bus signal of rectification module receiving host is simultaneously rectified, the rectified signal that LDO module receives rectification module output carries out pressure stabilizing output, the voltage regulation signal that DC/DC module receives the output of LDO module carries out voltage transformation, from machine controller receive signal acquisition module output signal and DC/DC module out-put supply signal and data interaction is carried out by communication module and host.By implementing the utility model, system stability is not only improved, but also can utmostly improve host carrying load ability.

Description

A kind of two lines bus slave power supply circuit

Technical field

The utility model relates to low power used system fields, and in particular to a kind of two lines bus slave power supply circuit.

Background technique

Currently, the application of fire-fighting two lines bus is largely focused on water meter, sensor, fire-fighting, industrial control field, these are answered Occasion is difficult to provide power to slave locally, provides power supply simultaneously during being typically necessary host and slave communication Power supply is to slave, the problem of this there is host carrying load ability.However different types of slave, especially with different electricity The slave of source topological structure, during networking, the load capacity of host, the stability of system can have biggish difference.

In the prior art, slave power supply conversion section uses list DC/DC scheme or LDO scheme, but both schemes All there are some problems in the application.Slave power supply conversion section uses list DC/DC scheme, sends and becomes in two lines bus host When the voltage signal of change, the input current of slave can be with variation, and positive feedback trend is presented, and there are unstable factors for system. Slave power supply conversion section uses list LDO scheme, and load capacity and load current are in inversely prroportional relationship, system load capacity It is restricted.

Utility model content

In view of the above-mentioned problems, the practical technical problems to be solved of the utility model are to provide a kind of fire-fighting two lines bus slave Power supply circuit, with overcome the deficiencies in the prior art.Specific technical solution is as follows:

A kind of two lines bus slave power supply circuit, including host, communication module, from machine controller, signal acquisition module, DC/ DC module, LDO module, rectification module；Host is connected after the input terminal of the communication module and the input terminal of rectification module are in parallel Output end, the output end connection of communication module is from the input terminal of machine controller；The output end of the rectification module connects LDO mould The input terminal of block；The input terminal of the output end connection DC/DC module of the LDO module；The output end of the DC/DC module connects From the input terminal of machine controller；Input terminal of the output end connection of the signal acquisition module from machine controller；The host hair Two lines bus signal is simultaneously rectified as input signal, the two lines bus signal of rectification module receiving host out, and LDO module receives whole The rectified signal of flow module output carries out pressure stabilizing output, and the voltage regulation signal that DC/DC module receives the output of LDO module carries out voltage change Change, from machine controller receive signal acquisition module output signal and DC/DC module out-put supply signal and by communication mould Block and host carry out data interaction.

Further, the rectification module includes: rectifier bridge ZU1, transition diode TVS2；Wherein, rectifier bridge ZU1's is defeated Enter end to be connected on host two lines bus, the input of LDO module is connected to after the output end parallel connection transition diode TVS2 of rectifier bridge ZU1 End.More preferably, rectifier bridge ZU1 is low pressure drop type, and transition diode TVS2 is the Low dark curient flow pattern of 40V specification.

Further, the LDO module includes LDO chip U1, output capacitance C1；Wherein, the input terminal of LDO chip U1 connects It is connected to the output end of rectification module, the input of DC/DC module is connected to after the output end parallel output capacitor C1 of LDO chip U1 End.More preferably, LDO chip U1 is low-power consumption, low pressure drop type, and output capacitance C1 is ceramic condenser.

Further, the DC/DC module includes DC/DC chip U2, output capacitance C2；Wherein, DC/DC chip U2's is defeated Enter the output end that end is connected to LDO module, is connected to the slave control after the output end parallel output capacitor C2 of DC/DC chip U2 The input terminal of device processed.More preferably, DC/DC chip U2 is low quiescent current, low-power consumption type, and output capacitance C2 is electrolytic capacitor.

The utility model has the beneficial effects that: being made by implementing two lines bus slave power supply circuit described in the utility model It obtains when two lines bus host sends the voltage signal of variation, DC/DC input terminal (LDO output end) voltage kept stable；DC/ There is a situation where of DC reduces bus current by improving input voltage so that bearing power is constant；Both system is improved Stability, and can utmostly improve host carrying load ability.

Detailed description of the invention

Fig. 1 is a kind of structural schematic diagram of two lines bus slave power supply circuit of the utility model；

Fig. 2 is a kind of schematic diagram of two lines bus slave power supply circuit of the utility model.

Specific embodiment

The principles of the present invention and feature are described in further detail with reference to the accompanying drawing, example is served only for solving Utility model is released, the scope of the utility model is not intended to limit.

A kind of two lines bus slave power supply circuit of the utility model as shown in Figure 1 and Figure 2, including host 100, communication module 200, from machine controller 300, signal acquisition module 400, DC/DC module 500, LDO module 600, rectification module 700；It is described logical Believe the output end that host 100 is connected after the input terminal of module 200 is in parallel with the input terminal of rectification module 700, communication module 200 Output end connects the input terminal from machine controller 300；The input of the output end connection LDO module 600 of the rectification module 700 End；The input terminal of the output end connection DC/DC module 500 of the LDO module 600；The output end of the DC/DC module 500 connects Connect the input terminal from machine controller 300；Input terminal of the output end connection of the signal acquisition module 400 from machine controller 300； The host 100 issues two lines bus signal as input signal, and the two lines bus signal of 700 receiving host 100 of rectification module is gone forward side by side Row rectification, LDO module 600 receive the rectified signal that rectification module 700 exports and carry out pressure stabilizing output, and DC/DC module 500 receives The voltage regulation signal that LDO module 600 exports carries out voltage transformation, and the output letter of signal acquisition module 400 is received from machine controller 300 Number and DC/DC module 500 out-put supply signal and data interaction is carried out by communication module 200 and host 100.

Further, the rectification module 700 includes: rectifier bridge ZU1, transition diode TVS2；Wherein, rectifier bridge ZU1 Input terminal be connected on 100 two lines bus of host, be connected to LDO after the output end parallel connection transition diode TVS2 of rectifier bridge ZU1 600 input terminal of module.More preferably, rectifier bridge ZU1 is low pressure drop type, and transition diode TVS2 is the Low dark curient flow pattern of 40V specification.

Further, the LDO module 600 includes LDO chip U1, output capacitance C1；Wherein, the input of LDO chip U1 End is connected to the output end of rectification module 700, is connected to DC/DC module after the output end parallel output capacitor C1 of LDO chip U1 500 input terminal.More preferably, LDO chip U1 is low-power consumption, low pressure drop type, and output capacitance C1 is ceramic condenser.

Further, the DC/DC module 500 includes DC/DC chip U2, output capacitance C2；Wherein, DC/DC chip U2 Input terminal be connected to the output end of LDO module 600, be connected to institute after the output end parallel output capacitor C2 of DC/DC chip U2 State the input terminal from machine controller 300.More preferably, DC/DC chip U2 is low quiescent current, low-power consumption type, and output capacitance C2 is Electrolytic capacitor.

Above embodiments are only to illustrate the technical ideas and features of the present invention, and its object is to allow be familiar with technique Personage can understand the content of the utility model and implement accordingly, can not limit protection scope of the utility model it is all Within the spirit and principles of the utility model, any modification, equivalent replacement, improvement and so on variation and modification should all include It is within the protection scope of the utility model.

Claims (7)

1. a kind of two lines bus slave power supply circuit, it is characterised in that: including host, communication module, from machine controller, signal acquisition Module, DC/DC module, LDO module, rectification module；After the input terminal of the communication module and the input terminal of rectification module are in parallel The output end of host is connected, the output end of communication module connects the input terminal from machine controller；The output end of the rectification module Connect the input terminal of LDO module；The input terminal of the output end connection DC/DC module of the LDO module；The DC/DC module Output end connects the input terminal from machine controller；Input terminal of the output end connection of the signal acquisition module from machine controller； The host issues two lines bus signal as input signal, and the two lines bus signal of rectification module receiving host is simultaneously rectified, LDO The rectified signal that module receives rectification module output carries out pressure stabilizing output, and DC/DC module receives the voltage regulation signal of LDO module output Carry out voltage transformation, from machine controller receive signal acquisition module output signal and DC/DC module out-put supply signal simultaneously Data interaction is carried out by communication module and host.

2. two lines bus slave power supply circuit according to claim 1, it is characterised in that: the rectification module includes: rectifier bridge ZU1, transition diode TVS2；Wherein, the input terminal of rectifier bridge ZU1 is connected on host two lines bus, the output end of rectifier bridge ZU1 LDO module input is connected to after transition diode TVS2 in parallel.

3. two lines bus slave power supply circuit according to claim 2, it is characterised in that: rectifier bridge ZU1 is low pressure drop type, transition Diode TVS2 is the Low dark curient flow pattern of 40V specification.

4. two lines bus slave power supply circuit according to claim 1, it is characterised in that: the LDO module includes LDO chip U1, output capacitance C1；Wherein, the input terminal of LDO chip U1 is connected to the output end of rectification module, the output end of LDO chip U1 The input terminal of DC/DC module is connected to after parallel output capacitor C1.

5. two lines bus slave power supply circuit according to claim 4, it is characterised in that: the LDO chip U1 is low-power consumption, low Pressure-drop type, output capacitance C1 are ceramic condenser.

6. two lines bus slave power supply circuit according to claim 1, it is characterised in that: the DC/DC module includes DC/DC core Piece U2, output capacitance C2；Wherein, the input terminal of DC/DC chip U2 is connected to the output end of LDO module, and DC/DC chip U2's is defeated The input terminal from machine controller is connected to after outlet parallel output capacitor C2.

7. two lines bus slave power supply circuit according to claim 6, it is characterised in that: the DC/DC chip U2 is low static state Electric current, low-power consumption type, output capacitance C2 are electrolytic capacitor.