CN203482083U - Power supply isolation circuit and wireless communication module - Google Patents
Power supply isolation circuit and wireless communication module Download PDFInfo
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- CN203482083U CN203482083U CN201320594446.2U CN201320594446U CN203482083U CN 203482083 U CN203482083 U CN 203482083U CN 201320594446 U CN201320594446 U CN 201320594446U CN 203482083 U CN203482083 U CN 203482083U
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- power supply
- resistance
- supply chip
- circuit
- isolation
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Abstract
The utility model relates to a power supply isolation circuit and a wireless communication module. The power supply isolation circuit comprises a protection capacitor, a direct current to direct current power supply chip, a freewheeling circuit, a first resistor, a second resistor and a direct current power supply isolation module, wherein the protection capacitor is connected in parallel between the positive electrode and the negative electrode of the input end of the direct current to direct current power supply chip; the freewheeling circuit is connected in series between the driving end and the switching end of the direct current to direct current power supply chip; the output end of the freewheeling circuit is connected with the first end of the first resistor; the second end of the first resistor is grounded via the second resistor; the voltage feedback end of the direct current to direct current power supply chip is connected at the place where the first resistor and the second resistor are connected; the positive electrode of the input end of the direct current power supply isolation module is connected with the first end of the first resistor; the negative electrode of the input end of the direct current power supply isolation module is grounded; and the output end of the direct current power supply isolation module provides output voltage. Therefore, isolation can be achieved, and potential safety problems are eliminated.
Description
Technical field
The utility model relates to isolated from power field, particularly relates to a kind of power isolation circuit and wireless communication module.
Background technology
In power communication application, a lot of intelligent instruments of installing are all with the communication interface that can plug communication module, because being all before coordinates power carrier meter-reading module to use, so the communication interface major part of intelligent instrument does not all have and mains isolation, if be changed to the micro power radio module with external antenna, antenna just communicates with civil power, has potential safety hazard.
Utility model content
Based on this, be necessary not isolate for communication interface and the civil power of traditional intelligent electric meter and wireless communication module the problem that has potential safety hazard, a kind of power isolation circuit that can eliminate safe hidden trouble is provided.
In addition, be also necessary to provide a kind of wireless communication module with above-mentioned power isolation circuit.
A kind of power isolation circuit, comprise protection electric capacity, DC-DC power supply chip, freewheeling circuit, the first resistance, the second resistance and DC power supply isolation module, described protection electric capacity in parallel between the positive pole of the input of described DC-DC power supply chip and negative pole, the freewheeling circuit of connecting between the drive end of described DC-DC power supply chip and switch terminals, the first end of the first resistance described in the output termination of described freewheeling circuit, the second end of described the first resistance is by described the second grounding through resistance, the pressure feedback port of described DC-DC power supply chip connects the junction of described the first resistance and the second resistance, the positive pole of the input of described DC power supply isolation module connects the first end of described the first resistance, the minus earth of the input of described DC power supply isolation module, the output of described DC power supply isolation module provides output voltage.
Therein in an embodiment, described freewheeling circuit comprises backward diode, inductance and filter capacitor, described backward diode is connected in parallel between the drive end and switch terminals of described DC-DC power supply chip, the first end of described inductance is connected on the drive end of described DC-DC power supply chip, the second end of described inductance connects the switch terminals of described DC-DC power supply chip by described filter capacitor, the second end of described inductance connects the first end of described the first resistance.
In an embodiment, the output output voltage of described DC power supply isolation module is 5V direct voltage therein.
A kind of wireless communication module, comprise wireless transceiver circuit and power isolation circuit, described power isolation circuit comprises protection electric capacity, DC-DC power supply chip, freewheeling circuit, the first resistance, the second resistance and DC power supply isolation module, described protection electric capacity in parallel between the positive pole of the input of described DC-DC power supply chip and negative pole, the freewheeling circuit of connecting between the drive end of described DC-DC power supply chip and switch terminals, the first end of the first resistance described in the output termination of described freewheeling circuit, the second end of described the first resistance is by described the second grounding through resistance, the pressure feedback port of described DC-DC power supply chip connects the junction of described the first resistance and the second resistance, the positive pole of the input of described DC power supply isolation module connects the first end of described the first resistance, the minus earth of the input of described DC power supply isolation module, the output of described DC power supply isolation module is connected with described wireless transceiver circuit.
Therein in an embodiment, described freewheeling circuit comprises backward diode, inductance and filter capacitor, described backward diode is connected in parallel between the drive end and switch terminals of described DC-DC power supply chip, the first end of described inductance is connected on the drive end of described DC-DC power supply chip, the second end of described inductance connects the switch terminals of described DC-DC power supply chip by described filter capacitor, the second end of described inductance connects the first end of described the first resistance.
In an embodiment, the output output voltage of described DC power supply isolation module is 5V direct voltage therein.
Above-mentioned power isolation circuit and wireless communication module, wherein power isolation circuit is applied to play buffer action between civil power and light current, guarantees that light current end is low-voltage, has eliminated potential safety hazard, has guaranteed personal safety.
Accompanying drawing explanation
Fig. 1 is the structural representation of power isolation circuit in an embodiment;
Fig. 2 is that power isolation circuit is applied to isolate civil power and light current, for the schematic diagram of microprocessor and wireless transceiver circuit power supply is provided;
Fig. 3 is the structural representation of a wireless communication module in embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, be the structural representation of power isolation circuit in an embodiment.This power isolation circuit 100, comprise protection capacitor C 1, DC-DC power supply chip 110, freewheeling circuit 120, the first resistance R 1, the second resistance R 2 and DC power supply isolation module 130, described protection capacitor C 1 in parallel between the positive pole of the input of DC-DC power supply chip 110 and negative pole, the freewheeling circuit 120 of connecting between the drive end of DC-DC power supply chip 110 and switch terminals, the first end of output termination first resistance R 1 of this freewheeling circuit 120, the second end of the first resistance R 1 is by the second resistance R 2 ground connection, the pressure feedback port of DC-DC power supply chip 110 connects the junction of the first resistance R 1 and the second resistance R 2, the positive pole of the input of DC power supply isolation module 130 connects the first end of the first resistance R 1, the minus earth of the input of DC power supply isolation module 130, the output of DC power supply isolation module 130 provides output voltage.
In the present embodiment, input termination+12V～45V voltage of DC-DC power supply chip 110.
This freewheeling circuit 120 comprises backward diode VD1, inductance L and filter capacitor C2, backward diode VD1 is connected in parallel between the drive end and switch terminals of DC-DC power supply chip 110, the first end of inductance L is connected on the drive end of DC-DC power supply chip 110, the second end of inductance L connects the switch terminals of DC-DC power supply chip 110 by filter capacitor C2, the second end of inductance L connects the first end of the first resistance R 1.Filter capacitor C2 is for filtering ripple, the effect of burning voltage.The value of inductance L depends on the value of the output voltage of regulation and control the first resistance R 1 and the rear DC-DC power supply chip 110 of the second resistance R 2, and the switching frequency of DC-DC power supply chip 110 is high, and the meeting of inductance L diminishes, and the value of inductance L can affect power-supply ripple simultaneously.Backward diode VD1 selects Schottky diode.
After DC power supply isolation module 130 isolation processing, its output output voltage is 5V direct voltage.The voltage of DC power supply isolation module 130 outputs can be used for microprocessor (Micro Control Unit, MCU) and wireless transceiver circuit (Radio Frequency, RF) power supply, reaches the isolation of civil power and light current.
As shown in Figure 2, for power isolation circuit 100 is applied to isolate civil power and light current, for the schematic diagram of microprocessor and wireless transceiver circuit power supply is provided.In Fig. 2, by the direct current of be converted to+12～5V of the alternating current of civil power 220V, and then after power isolation circuit 100 isolation, offer microprocessor and wireless transceiver circuit.
Above-mentioned power isolation circuit is applied to do insulating power supply in radio communication and tests with isolation optocoupler ac voltage withstanding, can be by the ac voltage withstanding insulation experiment of 3000V between module forceful electric power interface and light current external antenna, experimental period 5 seconds, leakage current is less than 0.1mA(milliampere), can guarantee that like this wireless module external antenna can be with 220V line voltage, eliminate potential safety hazard, guaranteed the personal safety of installation personnel.
Above-mentioned power isolation circuit, is applied to play buffer action between civil power and light current, guarantees that light current end is low-voltage, has eliminated potential safety hazard, has guaranteed personal safety.
As shown in Figure 3, be the structural representation of a wireless communication module in embodiment.This wireless communication module, comprises power isolation circuit 100 and wireless transceiver circuit 200.The output of DC power supply isolation module 130 is connected with wireless transceiver circuit 200.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (6)
1. a power isolation circuit, it is characterized in that, comprise protection electric capacity, DC-DC power supply chip, freewheeling circuit, the first resistance, the second resistance and DC power supply isolation module, described protection electric capacity in parallel between the positive pole of the input of described DC-DC power supply chip and negative pole, the freewheeling circuit of connecting between the drive end of described DC-DC power supply chip and switch terminals, the first end of the first resistance described in the output termination of described freewheeling circuit, the second end of described the first resistance is by described the second grounding through resistance, the pressure feedback port of described DC-DC power supply chip connects the junction of described the first resistance and the second resistance, the positive pole of the input of described DC power supply isolation module connects the first end of described the first resistance, the minus earth of the input of described DC power supply isolation module, the output of described DC power supply isolation module provides output voltage.
2. power isolation circuit according to claim 1, it is characterized in that, described freewheeling circuit comprises backward diode, inductance and filter capacitor, described backward diode is connected in parallel between the drive end and switch terminals of described DC-DC power supply chip, the first end of described inductance is connected on the drive end of described DC-DC power supply chip, the second end of described inductance connects the switch terminals of described DC-DC power supply chip by described filter capacitor, the second end of described inductance connects the first end of described the first resistance.
3. power isolation circuit according to claim 1, is characterized in that, the output output voltage of described DC power supply isolation module is 5V direct voltage.
4. a wireless communication module, it is characterized in that, comprise wireless transceiver circuit and power isolation circuit, described power isolation circuit comprises protection electric capacity, DC-DC power supply chip, freewheeling circuit, the first resistance, the second resistance and DC power supply isolation module, described protection electric capacity in parallel between the positive pole of the input of described DC-DC power supply chip and negative pole, the freewheeling circuit of connecting between the drive end of described DC-DC power supply chip and switch terminals, the first end of the first resistance described in the output termination of described freewheeling circuit, the second end of described the first resistance is by described the second grounding through resistance, the pressure feedback port of described DC-DC power supply chip connects the junction of described the first resistance and the second resistance, the positive pole of the input of described DC power supply isolation module connects the first end of described the first resistance, the minus earth of the input of described DC power supply isolation module, the output of described DC power supply isolation module is connected with described wireless transceiver circuit.
5. wireless communication module according to claim 4, it is characterized in that, described freewheeling circuit comprises backward diode, inductance and filter capacitor, described backward diode is connected in parallel between the drive end and switch terminals of described DC-DC power supply chip, the first end of described inductance is connected on the drive end of described DC-DC power supply chip, the second end of described inductance connects the switch terminals of described DC-DC power supply chip by described filter capacitor, the second end of described inductance connects the first end of described the first resistance.
6. wireless communication module according to claim 4, is characterized in that, the output output voltage of described DC power supply isolation module is 5V direct voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320594446.2U CN203482083U (en) | 2013-09-25 | 2013-09-25 | Power supply isolation circuit and wireless communication module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320594446.2U CN203482083U (en) | 2013-09-25 | 2013-09-25 | Power supply isolation circuit and wireless communication module |
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| Publication Number | Publication Date |
|---|---|
| CN203482083U true CN203482083U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320594446.2U Expired - Lifetime CN203482083U (en) | 2013-09-25 | 2013-09-25 | Power supply isolation circuit and wireless communication module |
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| CN (1) | CN203482083U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110927464A (en) * | 2019-11-19 | 2020-03-27 | 许继集团有限公司 | Online detection system for isolated power supply |
-
2013
- 2013-09-25 CN CN201320594446.2U patent/CN203482083U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110927464A (en) * | 2019-11-19 | 2020-03-27 | 许继集团有限公司 | Online detection system for isolated power supply |
| CN110927464B (en) * | 2019-11-19 | 2022-01-07 | 许继集团有限公司 | Online detection system for isolated power supply |
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Granted publication date: 20140312 |