CN204289267U - Relay low voltage start circuit and electronic equipment - Google Patents
Relay low voltage start circuit and electronic equipment Download PDFInfo
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- CN204289267U CN204289267U CN201420797280.9U CN201420797280U CN204289267U CN 204289267 U CN204289267 U CN 204289267U CN 201420797280 U CN201420797280 U CN 201420797280U CN 204289267 U CN204289267 U CN 204289267U
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Abstract
The utility model discloses a kind of relay low voltage start circuit and electronic equipment, this relay low voltage start circuit is for starting the relay be connected between live wire and load, comprise the first power module, second source module, voltage detection module, control module and switch module, first power module and second source module are used for providing starting resistor for relay, voltage detection module for detect first power module export magnitude of voltage and transmission control module, control module is used for the magnitude of voltage that receiver voltage detection module detects, and magnitude of voltage and preset value are compared, send according to comparative result and control signal to switch module, when external voltage reduces, first power module is not enough to starting relay, then control module control switch module disconnects the connection of connection between the first power module and relay, conducting second source module and relay, thus starting relay under realizing low-voltage state.
Description
Technical field
The utility model relates to field of power supplies, particularly relates to a kind of relay low voltage start circuit and electronic equipment.
Background technology
Usually, traditional fixed frequency air conditioner power circuit is by after transformer pressure-reducing, exports rectification unit to, DC power supply is rectified into through rectification unit, then after filter capacitor filtering high order harmonic component, the DC power supply of stable output, supply relay, after relay is started, control load switches on power.But the output voltage of linear transformer reduces along with input voltage and declines, therefore, when some region voltage instability makes the output voltage of transformer reduce, thus after rectification, output voltage also can reduce, cause relay to open, now fixed frequency air conditioner cannot work.
Utility model content
Main purpose of the present utility model is to provide a kind of relay low voltage start circuit, is intended to relay still can be started when extraneous input voltage is lower.
For achieving the above object, the utility model provides a kind of relay low voltage start circuit, for starting the relay be connected between live wire and load, comprise the first power module, second source module, voltage detection module, control module and switch module, described first power module is connected with described relay by described switch module, described second source module is connected with described relay by described switch module, the output of described first power module is connected with the test side of described voltage detection module, the output of described voltage detection module is connected with the input of described control module, described control module is connected with described switch module and described relay respectively, wherein, described voltage detection module detects the magnitude of voltage of described first power module output and described magnitude of voltage is transferred to described control module, described magnitude of voltage and preset value compare by described control module, send according to comparative result and control signal to described switch module, described switch module, based on the connection described in described control signal conducting between the first power module and described relay, makes described first power module be that described relay is powered, or the connection described in conducting between second source module and described relay, make described second source module be that described relay is powered, the magnitude of voltage that described second source module exports is not equal to the magnitude of voltage that described first power module exports.
Preferably, the magnitude of voltage that described second source module exports is greater than the magnitude of voltage that described first power module exports, described switch module comprises the first switch element and second switch unit, when the magnitude of voltage that described first power module exports is more than or equal to described preset value, first switch element described in described control module conducting, and disconnect described second switch unit, make described first power module be that described relay is powered; When the magnitude of voltage that described first power module exports is less than described preset value, second switch unit described in described control module conducting, and disconnect described first switch element, make described second source module be that described relay is powered.
Preferably, described first switch element comprises the first triode, described second switch unit comprises the second triode, the emitter of described first triode is connected with the output of described first power module, the collector electrode of described first triode is connected with the first end of the control coil of described relay, and the base stage of described first triode is connected with the first control end of described control module; The emitter of described second triode is connected with the output of described second source module, the collector electrode of described second triode is connected with the first end of the control coil of described relay, and the base stage of described second triode is connected with the second control end of described control module.
Preferably, described first triode and described second triode are PNP type triode.
Preferably, described first power module comprises the first secondary coil of transformer, the first rectifier bridge, the first electrochemical capacitor and the first ceramic disc capacitor, one end of described first secondary coil is connected with the first input end of described first rectifier bridge, and the other end of described first secondary coil is connected with the second input of described first rectifier bridge; Described first electrochemical capacitor is in parallel with described first ceramic disc capacitor; The positive pole of described first electrochemical capacitor is connected with the first output of described first rectifier bridge, and the negative pole of described first electrochemical capacitor is connected rear ground connection with the second output of described first rectifier bridge; The positive pole of described first electrochemical capacitor is connected with the input of described first switch element with the output of the common port of the first output of described first rectifier bridge as described first power module.
Preferably, described second source module comprises the second subprime coil of transformer, the second rectifier bridge, the second electrochemical capacitor and the second ceramic disc capacitor, one end of described second subprime coil is connected with the first input end of described second rectifier bridge, and the other end of described second subprime coil is connected with the second input of described second rectifier bridge; Described second electrochemical capacitor is in parallel with described second ceramic disc capacitor; The positive pole of described second electrochemical capacitor is connected with the first output of described second rectifier bridge, and the negative pole of described second electrochemical capacitor is connected rear ground connection with the second output of described second rectifier bridge; The positive pole of described second electrochemical capacitor is connected with the input of described second switch unit with the output of the common port of the first output of described second rectifier bridge as described second source module.
Preferably, described voltage detection module comprises the first resistance, the second resistance, one end of described first resistance is connected with the output of the first power module, the other end of described first resistance is through described second grounding through resistance, and the common port between described first resistance with described second resistance is connected with the input of described control module as the output of described voltage detection module.
Preferably, described relay low voltage start circuit also comprises the 3rd triode, the base stage of described 3rd triode is connected with the 3rd control end of described control module, the described collector electrode of the 3rd triode is connected with the second end of the control coil of described relay, the grounded emitter of described 3rd triode; 3rd triode is NPN type triode.
Preferably; described relay low voltage start circuit also comprises one for carrying out the diode of reverse-current protection to relay; the anode of described diode is connected with the collector electrode of described 3rd triode, and the negative electrode of described diode is connected with the first end of the control coil of described relay.
In addition, for achieving the above object, the utility model also provides a kind of electronic equipment, this electronic equipment comprises relay low voltage start circuit, this relay low voltage start circuit is for starting the relay be connected between live wire and load, comprise the first power module, second source module, voltage detection module, control module and switch module, described first power module is connected with described relay by described switch module, described second source module is connected with described relay by described switch module, the output of described first power module is connected with the test side of described voltage detection module, the output of described voltage detection module is connected with the input of described control module, described control module is connected with described switch module and described relay respectively, wherein, described voltage detection module detects the magnitude of voltage of described first power module output and described magnitude of voltage is transferred to described control module, described magnitude of voltage and preset value compare by described control module, send according to comparative result and control signal to described switch module, described switch module, based on the connection described in described control signal conducting between the first power module and described relay, makes described first power module be that described relay is powered, or the connection described in conducting between second source module and described relay, make described second source module be that described relay is powered, the magnitude of voltage that described second source module exports is not equal to the magnitude of voltage that described first power module exports.
A kind of relay low voltage start circuit provided by the utility model and comprise the electronic equipment of this relay low voltage start circuit, the starting resistor of this relay low voltage start circuit is optionally provided by the first power module and second source module, when external voltage input is normal, the voltage providing relay to start by the first power module, when external voltage is unstable, during lower than normal range (NR), now, the magnitude of voltage that the first power module that voltage detection module detects exports is also by the preset value lower than control module, the then connection of control module control switch module conducting second source module and relay, because the output of second source module is higher than the output of the first power module, even if the reduction of external voltage, make the output of the first power module and second source module lower than normal value, but the output of second source module is enough to turn-on relay, thus realize low-voltage turn-on relay, electronic equipment also can normally be worked under low-voltage state.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model preferred embodiment.
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of relay low voltage start circuit.
In the utility model embodiment, with reference to Fig. 1, this relay low voltage start circuit, for starting the relay R M1 be connected between live wire L and load Load, comprise the first power module 100, second source module 200, voltage detection module 300, control module 400 and switch module 500, described first power module 100 is connected with described relay R M1 by described switch module 500, described second source module 200 is connected with described relay R M1 by described switch module 500, the output of described first power module 100 is connected with the test side of described voltage detection module 300, the output of described voltage detection module 300 is connected with the input I/O1 of described control module 400, described control module 400 is connected with described switch module 500 and described relay R M1 respectively, wherein, described voltage detection module 300 detects the magnitude of voltage of described first power module 100 output and described magnitude of voltage is transferred to described control module 400, described magnitude of voltage and preset value compare by described control module 400, send according to comparative result and control signal to described switch module 500, described switch module 500, based on the connection described in described control signal conducting between the first power module 100 and described relay R M1, makes described first power module 100 power for described relay R M1, or the connection described in conducting between second source module 200 and described relay R M1, described second source module 200 is powered for described relay R M1, and the magnitude of voltage that described second source module 200 exports is not equal to the magnitude of voltage that described first power module 100 exports.
Particularly, the magnitude of voltage that second source module 200 exports is greater than the magnitude of voltage that described first power module 100 exports, described switch module 500 comprises the first switch element and second switch unit, when the magnitude of voltage that described first power module 100 exports is more than or equal to described preset value, first switch element described in the conducting of described control module 400, and disconnect described second switch unit, described first power module 100 is powered for described relay R M1; When the magnitude of voltage that described first power module 100 exports is less than described preset value, second switch unit described in the conducting of described control module 400, and disconnect described first switch element, described second source module 200 is powered for described relay R M1.
Usually, load Load is fixed frequency air conditioner, and the power circuit of fixed frequency air conditioner is by the adhesive of the first power module 100 control relay RM1 and disconnection, thus being turned on or off of control load Load and live wire L.Due to the spread of voltage of the first power module 100, when the preset value of magnitude of voltage lower than control module 400 that the first power module 100 that voltage detection module 300 detects exports, namely the magnitude of voltage that the first power module 100 exports is not enough to control relay RM1 and starts, thus fixed frequency air conditioner is by cisco unity malfunction; Now, control module 400 control switch module 500 conducting second source module 200, due to the magnitude of voltage that the magnitude of voltage of second source module 200 output exports higher than the first power module 100, thus the magnitude of voltage that second source module 200 exports will make relay R M1 open, relay R M1 adhesive, fixed frequency air conditioner and live wire L are connected, fixed frequency air conditioner normally works; Thus realize relay R M1 under low-voltage state, also can normally start.
Particularly, first switch element comprises the first triode Q1, described second switch unit comprises the second triode Q2, the emitter of the first triode Q1 is connected with the output of the first power module 100 as the input of the first switch element, and the emitter of the second triode Q2 is connected with the output of second source module 200 as the input of second switch unit; The base stage of the first triode Q1 and the base stage of the second triode Q2 are connected with the first control end I/O2 of control module 400 and the second control end I/O3 respectively as the control end of switch module 500; The collector electrode of the first triode Q1 is connected with the collector electrode of the second triode Q2, and this common node is connected with the first end e of the control coil of relay R M1 as the output of switch module 500.
In the present embodiment, first power module 100 and second source module 200 are provided by the two-way secondary side coil after transformer pressure-reducing respectively, the voltage that the first secondary coil S1 after transformer pressure-reducing process exports preferably exchanges 12V, this interchange 12V, after the first rectifier bridge B1 rectification, exports 12V direct current; Now, the 12V direct current of output, with other harmonic waves, carries out filtering process at the first output c of the first rectifier bridge B1, the first electrochemical capacitor C1 and the first ceramic disc capacitor C2 in parallel with between the second output d, obtains stable 12V direct current.The voltage that second subprime coil S2 after transformer pressure-reducing process exports preferably exchanges 18V, and this interchange 18V, after the second rectifier bridge B2 rectification, exports 18V direct current; Now, the 18V direct current of output, with other harmonic waves, carries out filtering process at the first output c ' of the second rectifier bridge B2, the second electrochemical capacitor C3 and the second ceramic disc capacitor C4 in parallel with between the second output d ', obtains stable 18V direct current.
Particularly, the turn ratio that the magnitude of voltage that the first secondary coil S1 and second subprime coil S2 exports can adjust transformer according to the actual requirements obtains, in this no limit; This first rectifier bridge B1 is identical with the second rectifier bridge B2 structure, forms by end to end four diodes.
When the input side voltage stabilization of transformer, i.e. the 12V DC stabilization of the first power module 100 output, now, this 12V direct voltage can maintain the normal startup of relay R M1; Voltage detecting is carried out in voltage detection module 300 output to first power module 100 in series by the first resistance R1 and the second resistance R2, first resistance R1 is connected with the output of the first power module 100, and this common node is the test side of voltage detection module 300; Because the first resistance R1 and the second resistance R2 forms bleeder circuit, and the common port of the first resistance R1 and the second resistance R2 is the output of voltage detection module 300, this detection voltage is the second resistance R2 dividing potential drop gained, therefore, the voltage that voltage detection module 300 detects will be also fixing, and the voltage this detected is passed to control module 400; Control module 400 is preferably MCU in the present embodiment, its inside is integrated with AD conversion module, then this receives after magnitude of voltage carries out AD conversion by MCU, after comparing with internal preset value, the input side of transformer is stablized, then magnitude of voltage will be more than or equal to preset value, namely now the first control end I/O2 of MCU by the base stage of lasting output low level to the first triode Q1, make the first triode Q1 constant conduction, first power module 100 and relay R M1 continue to connect, thus the first power module 100 is continuously relay R M1 provides starting resistor.
Particularly, in order to prevent electric current excessive, burning out MCU, between the output and the input I/O1 of MCU of voltage detection module 300, adding current-limiting resistance R3.
When the input side voltage instability timing of transformer, the input side voltage of transformer will lower than normal value, thus the first power module 100 export also will lower than 12V direct current, the direct voltage that this first power module 100 exports will be not enough to normal starting relay RM1; Now, the output of second source module 200 will lower than 18V, but the output voltage of second source module 200 is enough to starting relay RM1.After the output voltage of the first power module 100 then detected by voltage detection module 300 is sent to MCU, compare with the preset value of inside, also will lower than preset value, then the second control end I/O3 of MCU is by the base stage of output low level to the second triode Q2, by the second triode Q2 conducting, second source module 200 and relay R M1 is made to continue to connect, thus by second source module 200 for relay R M1 provides starting resistor, when to realize transformer input side be low-voltage, also can starting relay RM1, facilitate the normal use of fixed frequency air conditioner.
Particularly, the first triode Q1 and the second triode Q2 is preferably PNP type triode.
Further, in order to make relay R M1 when starting, its control coil forms loop, the first end e of control coil is connected with the collector electrode of the first triode Q1 and the second triode Q2, second end f of control coil can ground connection, thus, when control coil first end e has high level to input, get final product turn-on relay RM1, but in order to make relay R M1 stable performance, when circuit various piece connects normal, relay R M1 just starts, one the 3rd triode Q3 is connected at the second end f of the control coil of relay R M1, the collector electrode of the 3rd triode Q3 is connected with the second end f of control coil, its grounded emitter, its base stage is connected with the 3rd control end I/O4 of MCU, thus when circuit portions normal operation, the 3rd control end I/O4 of MCU exports high level, 3rd triode Q3 just conducting, now, control coil is through the 3rd triode Q3 ground connection, relay R M1 normally works.
Particularly, the 3rd triode Q3 is preferably NPN type triode
Further, a diode D1 is connected with the first end e of the control coil of relay R M1 at the collector electrode of the 3rd triode Q3, the anode of this diode D1 is connected with the collector electrode of the 3rd triode Q3, its negative electrode is connected with the first end e of the control coil of relay R M1, due to the unilateral conduction of diode D1, when can be used for preventing there is reverse current, the control coil of relay R M1 is burnt out.
The utility model also provides a kind of electronic equipment, this electronic equipment comprises the relay low voltage start circuit described in above-described embodiment, the structure of this relay low voltage start circuit, operation principle and the beneficial effect that brings, all with reference to the description of above-described embodiment, do not repeat them here.
These are only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (10)
1. a relay low voltage start circuit, for starting the relay be connected between live wire and load, it is characterized in that, comprise the first power module, second source module, voltage detection module, control module and switch module, described first power module is connected with described relay by described switch module, described second source module is connected with described relay by described switch module, the output of described first power module is connected with the test side of described voltage detection module, the output of described voltage detection module is connected with the input of described control module, described control module is connected with described switch module and described relay respectively, wherein, described voltage detection module detects the magnitude of voltage of described first power module output and described magnitude of voltage is transferred to described control module, described magnitude of voltage and preset value compare by described control module, send according to comparative result and control signal to described switch module, described switch module, based on the connection described in described control signal conducting between the first power module and described relay, makes described first power module be that described relay is powered, or the connection described in conducting between second source module and described relay, make described second source module be that described relay is powered, the magnitude of voltage that described second source module exports is not equal to the magnitude of voltage that described first power module exports.
2. relay low voltage start circuit as claimed in claim 1, it is characterized in that, the magnitude of voltage that described second source module exports is greater than the magnitude of voltage that described first power module exports, described switch module comprises the first switch element and second switch unit, when the magnitude of voltage that described first power module exports is more than or equal to described preset value, first switch element described in described control module conducting, and disconnect described second switch unit, make described first power module be that described relay is powered; When the magnitude of voltage that described first power module exports is less than described preset value, second switch unit described in described control module conducting, and disconnect described first switch element, make described second source module be that described relay is powered.
3. relay low voltage start circuit as claimed in claim 2, it is characterized in that, described first switch element comprises the first triode, described second switch unit comprises the second triode, the emitter of described first triode is connected with the output of described first power module, the collector electrode of described first triode is connected with the first end of the control coil of described relay, and the base stage of described first triode is connected with the first control end of described control module; The emitter of described second triode is connected with the output of described second source module, the collector electrode of described second triode is connected with the first end of the control coil of described relay, and the base stage of described second triode is connected with the second control end of described control module.
4. relay low voltage start circuit as claimed in claim 3, it is characterized in that, described first triode and described second triode are PNP type triode.
5. relay low voltage start circuit as claimed in claim 2, it is characterized in that, described first power module comprises the first secondary coil of transformer, the first rectifier bridge, the first electrochemical capacitor and the first ceramic disc capacitor, one end of described first secondary coil is connected with the first input end of described first rectifier bridge, and the other end of described first secondary coil is connected with the second input of described first rectifier bridge; Described first electrochemical capacitor is in parallel with described first ceramic disc capacitor; The positive pole of described first electrochemical capacitor is connected with the first output of described first rectifier bridge, and the negative pole of described first electrochemical capacitor is connected rear ground connection with the second output of described first rectifier bridge; The positive pole of described first electrochemical capacitor is connected with the input of described first switch element with the output of the common port of the first output of described first rectifier bridge as described first power module.
6. relay low voltage start circuit as claimed in claim 2, it is characterized in that, described second source module comprises the second subprime coil of transformer, the second rectifier bridge, the second electrochemical capacitor and the second ceramic disc capacitor, one end of described second subprime coil is connected with the first input end of described second rectifier bridge, and the other end of described second subprime coil is connected with the second input of described second rectifier bridge; Described second electrochemical capacitor is in parallel with described second ceramic disc capacitor; The positive pole of described second electrochemical capacitor is connected with the first output of described second rectifier bridge, and the negative pole of described second electrochemical capacitor is connected rear ground connection with the second output of described second rectifier bridge; The positive pole of described second electrochemical capacitor is connected with the input of described second switch unit with the output of the common port of the first output of described second rectifier bridge as described second source module.
7. relay low voltage start circuit as claimed in claim 1, it is characterized in that, described voltage detection module comprises the first resistance, the second resistance, one end of described first resistance is connected with the output of the first power module, the other end of described first resistance is through described second grounding through resistance, and the common port between described first resistance with described second resistance is connected with the input of described control module as the output of described voltage detection module.
8. relay low voltage start circuit as claimed in claim 1, it is characterized in that, described relay low voltage start circuit also comprises the 3rd triode, the base stage of described 3rd triode is connected with the 3rd control end of described control module, the described collector electrode of the 3rd triode is connected with the second end of the control coil of described relay, the grounded emitter of described 3rd triode; Described 3rd triode is NPN type triode.
9. relay low voltage start circuit as claimed in claim 8; it is characterized in that; described relay low voltage start circuit also comprises one for carrying out the diode of reverse-current protection to relay; the anode of described diode is connected with the collector electrode of described 3rd triode, and the negative electrode of described diode is connected with the first end of the control coil of described relay.
10. an electronic equipment, is characterized in that, comprises the relay low voltage start circuit according to any one of claim 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420797280.9U CN204289267U (en) | 2014-12-15 | 2014-12-15 | Relay low voltage start circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420797280.9U CN204289267U (en) | 2014-12-15 | 2014-12-15 | Relay low voltage start circuit and electronic equipment |
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| CN204289267U true CN204289267U (en) | 2015-04-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410993A (en) * | 2019-07-25 | 2019-11-05 | 广东志高暖通设备股份有限公司 | The method of supplying power to of air-conditioning circuit and air-conditioning |
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2014
- 2014-12-15 CN CN201420797280.9U patent/CN204289267U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410993A (en) * | 2019-07-25 | 2019-11-05 | 广东志高暖通设备股份有限公司 | The method of supplying power to of air-conditioning circuit and air-conditioning |
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