CN205755246U - A kind of AC DC power module - Google Patents
A kind of AC DC power module Download PDFInfo
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- CN205755246U CN205755246U CN201620672864.2U CN201620672864U CN205755246U CN 205755246 U CN205755246 U CN 205755246U CN 201620672864 U CN201620672864 U CN 201620672864U CN 205755246 U CN205755246 U CN 205755246U
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Abstract
The utility model discloses a kind of AC DC power module, its drip irrigation device is to include the heating unit being located on AC DC power module, temperature detecting unit, control unit and be preset with the first comparing unit of the first reference voltage signal；Temperature detecting unit detects signal for detecting the temperature within AC DC power module with output temperature；First comparing unit is coupled to temperature detecting unit to receive temperature detection signal, and exports the first comparison signal after temperature detection signal and the first reference voltage signal；Control unit is coupled to the first comparing unit to receive the first comparison signal；When temperature detection signal is less than the first reference voltage signal, AC DC power module is heated to control heating unit work by control unit in response to the first comparison signal.When the temperature of AC DC power module work is less than standard operating temperature lower limit, by heating unit, it is carried out heating and be allowed to keep constant temperature to be in normal operating conditions, thus increase its adaptability to cold environment.
Description
Technical field
This utility model relates to power-supply device field, particularly to a kind of AC-DC power module.
Background technology
AC-DC power module, is a kind of device that can make to form constant current in circuit, has a wide range of applications.
At present, notification number is that the Chinese patent of CN203352896U discloses a kind of LED-based emergency light, its bag
Including LED, AC-DC power module, battery, whole circuit is carried out by AC-DC power module as the DC source needed for system
Power supply, also bus detection of power loss module, bus detection of power loss module detects whether to have a power failure, and output switching signal is to combining
Closing control module, intelligent comprehensive control module controls battery and charges and discharges electricity and the switch controlling LED and light intensity.
Although this LED-based emergency light have can when power down the function of automatic bright light, but, to AC-
Finding in DC research process, AC-DC power module has the most corresponding standard operating temperature.When the temperature of working environment is low
When standard operating temperature, AC-DC power module will be unable to normally work.Such as, if the emergency light of this kind of LED is used in north
Side, be in the environment in winter in the north, when bulk temperature is relatively low, wherein AC-DC power module possibly cannot normal power supply, because of
, there are certain improvements in this.
Utility model content
The deficiency existed for prior art, the purpose of this utility model is to provide a kind of AC-DC power module, at ring
When border temperature is relatively low, AC-DC power module can be heated so that AC-DC power module normally works.
Above-mentioned technical purpose of the present utility model has the technical scheme that
A kind of AC-DC power module, including the heating unit being located in AC-DC power module, temperature detecting unit, control
Unit and be preset with the first comparing unit of the first reference voltage signal；
Described temperature detecting unit detects signal for detecting the temperature within AC-DC power module with output temperature；
Described first comparing unit is coupled to temperature detecting unit to receive temperature detection signal, and by temperature detection signal
The first comparison signal is exported with the first reference voltage signal after comparing；
Described control unit is coupled to the first comparing unit to receive the first comparison signal；
When temperature detection signal less than the first reference voltage signal time, described control unit in response to the first comparison signal with
Control heating unit work AC-DC power module is heated.
By technique scheme, owing to AC-DC power module has the most corresponding standard operating temperature, in winter
When surrounding is colder, cannot normally be worked less than AC-DC power module by temperature detection signal detection temperature
During low temperature, work by controlling heating unit, AC-DC power module is heated, thus ensures AC-DC power module
Operating temperature be under standard operating temperature；When the temperature recovery of AC-DC power module is to standard operating temperature, heating is single
Unit will no longer work, if the temperature in AC-DC power module drops under standard operating temperature, heating unit will add at once
Heat, repeatedly under so that the temperature of AC-DC power module remains constant, so that it can adapt to more cold ring
Border.
Preferably, described first comparing unit is coupled with the first setting for regulating the first reference voltage signal size
Portion.
By technique scheme, the first reference voltage signal is the lowest temperature angle value that heating unit starts, and first sets
First reference voltage signal size is adjusted by arranging of portion, thus facilitates debugging and the maintenance in later stage；And first sets
The setting in portion, primarily serves the lowest temperature angle value that regulation heating unit starts, owing to AC-DC power module is heated by heating unit
Make its temperature increase and need the regular hour, regulate the first reference voltage signal more than AC-DC power supply mould by the first configuration part
The lower limit of block standard operating temperature so that when the temperature of AC-DC power module drops to the lower limit of standard operating temperature soon,
Heating unit will start so that the temperature of AC-DC power module no longer declines, to ensure that AC-DC power module will not stop
Work, and make its temperature slowly go up later.
Preferably, described heating unit is PTC heater, and PTC heater is located on the outer surface of AC-DC power module.
By technique scheme, when PTC heater damages, PTC heater low cost and easy for installation, it is simple to after
The maintenance of phase and maintenance.
Preferably, also include that the first indicating member, described first indicating member are coupled to the first comparing unit to receive
One comparison signal, and in response to the first comparison signal to realize instruction.
By technique scheme, while heating unit starts, the first indicating member will realize instruction accordingly, thus
Give user of service sufficiently to indicate, to carry out sufficiently preparation.
Preferably, described first indicating member is indicated by the first light emitting diode.
By technique scheme, the first light emitting diode sends the mode of gold-tinted instruction, reaches clearly to make
While personnel's instruction information, and do not result in dispersion and the interference of user of service's attention.
Preferably, also include heat-sink unit, the performance element be located in AC-DC power module and be preset with the second base
Second comparing unit of quasi-voltage signal；
Described second comparing unit is coupled to temperature detecting unit to receive temperature detection signal, and by temperature detection signal
The second comparison signal is exported with the second reference voltage signal after comparing；
Described performance element is coupled to the second comparing unit to receive the second comparison signal；
When temperature detection signal more than the second reference voltage signal time, described performance element in response to the second comparison signal with
Control heat-sink unit startup AC-DC power module is dispelled the heat.
By technique scheme, the standard operating voltage of AC-DC power module has upper and lower bound, at AC-DC electricity
When the temperature of source module local environment is less than its standard operating voltage, by heating unit, it can be heated so that it is keep constant temperature,
Can normally work, hereby it is ensured that the adaptability that AC-DC power module is to environment, also can work in cold environment；At AC-DC
When the temperature of power module local environment is higher than its standard operating voltage, by heat-sink unit, it can be dispelled the heat so that it is protect
Hold between standard operating voltage, hereby it is ensured that AC-DC power module can work in the environment of high temperature, improve it further right
Adaptability in environment.
Preferably, described second comparing unit is coupled with the second configuration part for regulating the second reference voltage signal.
By technique scheme, the setting of the second configuration part, the size of the second reference voltage signal, i.e. AC-can be regulated
DC power module opens the temperature value needed for heat-sink unit；Temperature value needed for being opened by the second configuration part regulation heat-sink unit
Less than the upper limit of standard operating temperature, when AC-DC power module works, the temperature of himself soon reaches standard operating temperature
The upper limit time, heat-sink unit is started working in advance and is lowered the temperature it, thus ensures the operating temperature of AC-DC power module all the time
Less than the upper limit of standard operating temperature, thus being allowed to keep duty, circuit structure is convenient, simple, it is easy to implement.
Preferably, described heat-sink unit is fan.
By technique scheme, AC-DC power module is blown by fan, to increase AC-DC power module air
Flowing velocity, keeps its air to flow, the mode carrying out dispelling the heat of being come up by heat band, radiating effect, and also fan is changed conveniently,
Cost is relatively low, it is simple to the maintenance in later stage and maintenance.
Preferably, also include that the second indicating member, described second indicating member are coupled to the second comparing unit to receive
Two comparison signals, and in response to the second comparison signal to realize instruction.
By technique scheme, while heat-sink unit starts, the first indicating member will realize instruction accordingly, thus
Give user of service sufficiently to indicate, to carry out sufficiently preparation.
Preferably, described second indicating member is indicated by the second light emitting diode.
By technique scheme, the first light emitting diode sends the mode of green glow instruction, reaches clearly to make
While personnel's instruction information, and do not result in dispersion and the interference of user of service's attention.
In sum, this utility model in contrast to having the beneficial effect that of prior art
1, when the temperature of AC-DC power module work is less than standard operating temperature lower limit, by heating unit to AC-DC
Power module carries out heating and is allowed to keep constant temperature to be in normal operating conditions, thus increases its adaptability to cold environment；
2, when the temperature of AC-DC power module work is higher than the standard operating temperature upper limit, by heat-sink unit to AC-DC
Power module carries out heat radiation and is allowed to be between standard operating temperature, thus increases its adaptability to hot environment.
Accompanying drawing explanation
Fig. 1 is temperature detecting unit, control unit, the circuit theory diagrams of the first comparing unit；
Fig. 2 be temperature detecting unit, control unit, performance element, the first comparing unit, the second comparing unit circuit former
Reason figure.
Reference: 1, heating unit；2, temperature detecting unit；3, control unit；4, the first comparing unit；5, first set
Determine portion；6, the first indicating member；7, heat-sink unit；8, performance element；9, the second comparing unit；10, the second configuration part；11,
Two indicating members；LED1, the first light emitting diode；LED2, the second light emitting diode.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described in further detail.
Embodiment one:
A kind of AC-DC power module, as it is shown in figure 1, include heating unit 1, the temperature inspection being located in AC-DC power module
Survey unit 2, control unit 3 and be preset with the first comparing unit 4 of the first reference voltage signal；Temperature detecting unit 2 is used for
Detection temperature within AC-DC power module detects signal with output temperature；First comparing unit 4 is coupled to temperature detecting unit
2 to receive temperature detection signal, and exports the first comparison signal after temperature detection signal and the first reference voltage signal；
Control unit 3 is coupled to the first comparing unit 4 to receive the first comparison signal；When temperature detection signal is less than the first reference voltage
During signal, control unit 3 works in response to the first comparison signal heat AC-DC power module to control heating unit 1.
Temperature detecting unit 2 includes critesistor RT1 and resistance R1, after one end of critesistor RT1 is connected to resistance R1
Connect the other end ground connection of power supply VCC, critesistor RT1.Critesistor RT1 is arranged on the inside of AC-DC power module, is used for
Detect its internal temperature, thus when the ambient temperature residing for AC-DC power module is relatively low, the temperature also phase that himself is internal
Should be relatively low, measurement result can be made more accurate by measuring its internal temperature, and be avoided that unnecessary interference.Temperature-sensitive electricity
Resistance RT1 uses the critesistor RT1 of positive temperature coefficient, thus according to the characteristic of its positive temperature coefficient, detects at critesistor RT1
To AC-DC power module internal temperature diminish time, the resistance of critesistor RT1 will diminish, according to critesistor RT1 and resistance R1
The bleeder circuit constituted, the resistance of resistance R1 is constant, thus critesistor RT1 assigns to voltage diminishes；Otherwise, critesistor RT1
Detecting when AC-DC power module internal temperature becomes big, the resistance of critesistor RT1 becomes big, the voltage that critesistor RT1 assigns to
Become big.
First comparing unit 4 includes comparator N1, resistance R3, the end of oppisite phase of comparator N1 be connected to critesistor RT1 and
On node between resistance R1, the in-phase end of comparator N1 connects power supply VCC after connecting resistance R3.The of first comparing unit 4
One reference voltage signal is arranged by resistance R3.Wherein, on the in-phase end of comparator N1, connection has resistance R2, resistance R2 to play limit
The effect of stream, the current value being used for preventing temperature detection signal is excessive.
The first configuration part 5 for regulating the first reference voltage signal size it is coupled with on first comparing unit 4.First sets
Determine portion 5 to include between the end of oppisite phase that slide rheostat RP1, slide rheostat RP1 one end is connected to resistance R3 and comparator N1
On node, the other end ground connection of slide rheostat RP1.Slide rheostat RP1 and resistance R3 constitutes bleeder circuit, thus regulates
The voltage that the resistance of slide rheostat RP1 and changing is assigned on resistance R3, thus the first reference voltage arranged by resistance R3
The size of signal will change therewith.
Control unit 3 includes the audion Q1 of NPN type, relay K M1, and the base stage of audion Q1 is connected to comparator N1's
On outfan, one end of relay K M1 coil connects power supply VCC, and the other end is connected on the colelctor electrode of audion Q1, audion
The grounded emitter of Q1.Between the outfan and the base stage of audion Q1 of comparator N1, it is also associated with resistance R4, resistance R4 rise
To the effect of current limliting, the current value being used for preventing the first comparison signal is excessive.
Heating unit 1 is PTC heater, and PTC heater is located on the outer surface of AC-DC power module.Heating unit 1 is even
Being connected in alternating current power supply, the normally opened contact of relay K M1 is connected on the current supply circuit of heating unit 1, thus in temperature detection
Unit 2 detects when the temperature value within AC-DC power module is too low, controls heating unit 1 by control unit 3 and works, adds
Hot cell 1 starts to produce heat so that the skin temperature of AC-DC power module rises, so that inside AC-DC power module
Temperature keep a constant temperature state, reach its standard operating temperature, it is to avoid AC-DC power module is because of operating ambient temperature
Too low and quit work, thus ensure that it adapts to the environment of cold.
Embodiment two:
On the basis of embodiment one, as it is shown in figure 1, also include the first indicating member 6, the first indicating member 6 couples
In the first comparing unit 4 to receive the first comparison signal, and in response to the first comparison signal to realize instruction.First indicating member
6 are indicated by the first LED 1.First LED 1 is connected in parallel on relay K M1 coil, three
During pole pipe Q1 conducting, the first LED 1 is by mutually deserved electroluminescence, and the first LED 1 will send gold-tinted, give
Give user of service's clear indication.
Operation principle:
When the temperature within AC-DC power module reduces, the resistance of critesistor RT1 declines therewith so that temperature-sensitive electricity
The voltage of resistance RT1 declines, thus the temperature detection signal of temperature detecting unit 2 output decreases, thus comparator N1 is by temperature
Degree detection signal and the first reference voltage signal compare, and decrease below the first reference voltage letter at temperature detection signal
Number so that the base stage of the first comparison signal of comparator N1 output high level to audion Q1, audion Q1 turns on, relay
KM1 obtains electric, the normally opened contact Guan Bi of relay K M1, thus turns on the current supply circuit of heating unit 1, is allowed to heating and adds AC-DC
Thermal modules heats；Otherwise, when temperature within AC-DC power module raises so that temperature detection signal raises more than the
One reference voltage signal so that the base stage of the first comparison signal of comparator N1 output low level to audion Q1, audion Q1
Cut-off, relay K M1 dead electricity, thus heating unit 1 no power does not generates heat.Now, first on relay K M1 coil it is connected on
Mutually deserved conducting is sent gold-tinted by LED 1.
Embodiment three:
On the basis of embodiment two, shown in Fig. 1 and Fig. 2, also include the heat radiation being located in AC-DC power module
Unit 7, performance element 8 and be preset with the second comparing unit 9 of the second reference voltage signal；Second comparing unit 9 is coupled to
Temperature detecting unit 2 is to receive temperature detection signal, and exports after temperature detection signal and the second reference voltage signal
Second comparison signal；Performance element 8 is coupled to the second comparing unit 9 to receive the second comparison signal；When temperature detection signal is big
When the second reference voltage signal, performance element 8 starts AC-DC electricity to control heat-sink unit 7 in response to the second comparison signal
Source module dispels the heat.
Second comparing unit 9 includes comparator N2, resistance R5, the in-phase end of comparator N2 be connected to critesistor RT1 and
On node between resistance R1, the end of oppisite phase of comparator N1 connects power supply VCC after connecting resistance R6.The of second comparing unit 9
Two reference voltage signals are arranged by resistance R6.Wherein, on the in-phase end of comparator N2, connection has resistance R5, resistance R5 to play limit
The effect of stream, the current value being used for preventing temperature detection signal is excessive.
The second configuration part 10 for regulating the second reference voltage signal size it is coupled with on second comparing unit 9.Second
Configuration part 10 includes between the end of oppisite phase that slide rheostat RP2, slide rheostat RP2 one end is connected to resistance R6 and comparator N2
Node on, the other end ground connection of slide rheostat RP2.Slide rheostat RP2 and resistance R6 constitutes bleeder circuit, thus adjusts
The voltage that the resistance and changing of joint slide rheostat RP2 is assigned on resistance R6, thus the second benchmark arranged by resistance R6 is electric
The size of pressure signal will change therewith.
Performance element 8 includes the audion Q2 of NPN type, relay K M2, and the base stage of audion Q2 is connected to comparator N2's
On outfan, one end of relay K M2 coil connects power supply VCC, and the other end is connected on the colelctor electrode of audion Q2, audion
The grounded emitter of Q2.Between the outfan and the base stage of audion Q2 of comparator N2, it is also associated with resistance R7, resistance R7 rise
To the effect of current limliting, the current value being used for preventing the second comparison signal is excessive.
Heat-sink unit 7 is fan.Fan is connected in alternating current power supply, and the normally opened contact of relay K M2 is connected on fan
On current supply circuit, thus when temperature detecting unit 2 detects that the temperature value within AC-DC power module is too high, by performing
Unit 8 controls fan work, and fan starts to blow AC-DC power module, increases its air passage rates so that AC-
The temperature of DC power module reduces, so that the temperature within AC-DC power module is maintained between standard operating temperature, with
Avoid AC-DC power module to quit work because operating ambient temperature is too high, thus ensure that it adapts to the environment of high temperature.
Embodiment four:
On the basis of embodiment three, as in figure 2 it is shown, also include the second indicating member 11, the second indicating member 11 coupling
It is connected to the second comparing unit 9 to receive the second comparison signal, and in response to the second comparison signal to realize instruction.Second instruction is single
Unit 11 is indicated by the second LED 2.Second LED 2 is connected in parallel on relay K M2 coil, from
And when audion Q2 turns on, the second mutually the most deserved electricity of LED 2, send green glow and give user of service instruction.
Operation principle:
When the ambient temperature residing for AC-DC power module is too high so that the temperature within AC-DC power module raises,
The resistance of critesistor RT1 rises therewith so that the voltage of critesistor RT1 rises, thus the temperature of temperature detecting unit 2 output
Degree detection signal rise therewith, thus comparator N1 temperature detection signal and the first reference voltage signal are compared export low
First comparison signal of level ends to the base stage of audion Q1, audion Q1 so that heating unit 1 does not works；And comparator
N2 exports the second comparison signal of high level to audion after temperature detection signal and the second reference voltage signal being compared
The base stage of Q2 so that audion Q2 turns on, and relay K M2 obtains electric, the normally opened contact Guan Bi of relay K M2 so that fan starts
AC-DC power module is dispelled the heat by work；Otherwise, if the temperature within AC-DC power module is less than standard operating temperature
The upper limit, i.e. temperature detection signal are less than the second reference voltage signal, and during more than the first reference voltage signal, will make to compare
First comparison signal of device N1 and comparator N2 output low level respectively and low level second comparison signal so that heating unit
1 and fan do not work, represent AC-DC power module be under standard operating temperature.
And while audion Q2 turns on, the second LED 2 is mutually the most deserved to be conducted, and sends green glow.
AC-DC power module is divided into business level, technical grade and army grade, the standard of the AC-DC power module of business level
Operating temperature is between 0 DEG C ~ 50 DEG C, and the standard operating temperature of technical grade is between-25 DEG C ~+50 DEG C, and the standard of army grade works
Temperature is between-40 DEG C ~+55 DEG C；Wherein, the price of technical grade at least exceeds one times than the price of business level, and army grade
Price at least exceeds several times even tens times than the price of business level.If emergency light of the prior art uses at cold district
During AC-DC power module, it is equipped with technical grade or the AC-DC power module of army grade for it, needs substantial amounts of cost.And this programme
The components and parts of middle employing are conventional device, and price is low, thus well below technical grade or army grade AC-DC power module
Purchase cost, thus can use on a large scale, meet business level AC-DC power module and use in cold or high temperature area.
The above is only exemplary embodiment of the present utility model, not for limiting protection model of the present utility model
Enclosing, protection domain of the present utility model is determined by appended claim.
Claims (10)
1. an AC-DC power module, is characterized in that: include heating unit (1), the temperature inspection being located in AC-DC power module
Survey unit (2), control unit (3) and be preset with first comparing unit (4) of the first reference voltage signal；
Described temperature detecting unit (2) detects signal for detecting the temperature within AC-DC power module with output temperature；
Described first comparing unit (4) is coupled to temperature detecting unit (2) to receive temperature detection signal, and temperature detection is believed
The first comparison signal is exported after number comparing with the first reference voltage signal；
Described control unit (3) is coupled to the first comparing unit (4) to receive the first comparison signal；
When temperature detection signal less than the first reference voltage signal time, described control unit (3) in response to the first comparison signal with
Control heating unit (1) work AC-DC power module is heated.
A kind of AC-DC power module the most according to claim 1, is characterized in that: couple on described first comparing unit (4)
There is the first configuration part (5) for regulating the first reference voltage signal size.
A kind of AC-DC power module the most according to claim 1, is characterized in that: described heating unit (1) is PTC heating
Body, PTC heater is located on the outer surface of AC-DC power module.
A kind of AC-DC power module the most according to claim 1, is characterized in that: also include the first indicating member (6), institute
State the first indicating member (6) and be coupled to the first comparing unit (4) to receive the first comparison signal, and in response to the first comparison signal
To realize instruction.
A kind of AC-DC power module the most according to claim 4, is characterized in that: described first indicating member (6) is by the
One light emitting diode (LED1) indicates.
A kind of AC-DC power module the most according to claim 1, is characterized in that: also include being located in AC-DC power module
Heat-sink unit (7), performance element (8) and be preset with second comparing unit (9) of the second reference voltage signal；
Described second comparing unit (9) is coupled to temperature detecting unit (2) to receive temperature detection signal, and temperature detection is believed
The second comparison signal is exported after number comparing with the second reference voltage signal；
Described performance element (8) is coupled to the second comparing unit (9) to receive the second comparison signal；
When temperature detection signal more than the second reference voltage signal time, described performance element (8) in response to the second comparison signal with
Control heat-sink unit (7) startup AC-DC power module is dispelled the heat.
A kind of AC-DC power module the most according to claim 6, is characterized in that: couple on described second comparing unit (9)
There is the second configuration part (10) for regulating the second reference voltage signal.
A kind of AC-DC power module the most according to claim 6, is characterized in that: described heat-sink unit (7) is fan.
A kind of AC-DC power module the most according to claim 6, is characterized in that: also include the second indicating member (11), institute
State the second indicating member (11) and be coupled to the second comparing unit (9) to receive the second comparison signal, and compare letter in response to second
Number with realize instruction.
A kind of AC-DC power module the most according to claim 9, is characterized in that: described second indicating member (11) is passed through
Second light emitting diode (LED2) indicates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620672864.2U CN205755246U (en) | 2016-06-29 | 2016-06-29 | A kind of AC DC power module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620672864.2U CN205755246U (en) | 2016-06-29 | 2016-06-29 | A kind of AC DC power module |
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| CN205755246U true CN205755246U (en) | 2016-11-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979368A (en) * | 2017-12-20 | 2018-05-01 | 江汉大学 | The temperature control system of atomic frequency standard |
| CN108123711A (en) * | 2017-12-20 | 2018-06-05 | 江汉大学 | A kind of temperature control system of atomic frequency standard |
| CN109462338A (en) * | 2018-10-25 | 2019-03-12 | 张家港市华为电子有限公司 | A kind of DC-DC converter |
| CN109637496A (en) * | 2019-02-25 | 2019-04-16 | 昆山龙腾光电有限公司 | Liquid crystal display device and its driving method |
| CN110544453A (en) * | 2019-09-03 | 2019-12-06 | 青岛海信电器股份有限公司 | Display device |
| CN112952768A (en) * | 2020-12-09 | 2021-06-11 | 真兰电气(上海)有限公司 | Circuit breaker PTC thermal protection circuit |
-
2016
- 2016-06-29 CN CN201620672864.2U patent/CN205755246U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979368A (en) * | 2017-12-20 | 2018-05-01 | 江汉大学 | The temperature control system of atomic frequency standard |
| CN108123711A (en) * | 2017-12-20 | 2018-06-05 | 江汉大学 | A kind of temperature control system of atomic frequency standard |
| CN107979368B (en) * | 2017-12-20 | 2021-08-31 | 江汉大学 | Temperature control system of atomic frequency standard |
| CN109462338A (en) * | 2018-10-25 | 2019-03-12 | 张家港市华为电子有限公司 | A kind of DC-DC converter |
| CN109637496A (en) * | 2019-02-25 | 2019-04-16 | 昆山龙腾光电有限公司 | Liquid crystal display device and its driving method |
| CN109637496B (en) * | 2019-02-25 | 2021-08-06 | 昆山龙腾光电股份有限公司 | Liquid crystal display device and driving method thereof |
| CN110544453A (en) * | 2019-09-03 | 2019-12-06 | 青岛海信电器股份有限公司 | Display device |
| CN112952768A (en) * | 2020-12-09 | 2021-06-11 | 真兰电气(上海)有限公司 | Circuit breaker PTC thermal protection circuit |
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