CN206619901U - A kind of DC DC power modules and electronic equipment - Google Patents
A kind of DC DC power modules and electronic equipment Download PDFInfo
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- CN206619901U CN206619901U CN201720167605.9U CN201720167605U CN206619901U CN 206619901 U CN206619901 U CN 206619901U CN 201720167605 U CN201720167605 U CN 201720167605U CN 206619901 U CN206619901 U CN 206619901U
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Abstract
The utility model discloses a kind of DC DC power modules and electronic equipment, the power module includes DC DC conversion chips, power inductance, passive resonant circuit, voltage comparator circuit and enables control circuit, and power inductance is connected between the switch pin of DC DC conversion chips and the power output end of DC DC power modules；Passive resonant circuit includes the resonant inductance for being used to receive the electromagnetic energy that the power inductance is produced, and passive resonant circuit is arranged to provide the voltage signal that reflection flows through the size of current of power inductance to voltage comparator circuit；The reference voltage that voltage comparator circuit is arranged to by the magnitude of voltage of voltage signal with setting is compared, and exports first switch signal when magnitude of voltage is more than reference voltage；Control circuit is enabled to be arranged to close the signal of DC DC conversion chips to the enable pin output of DC DC conversion chips when receiving first switch signal.
Description
Technical field
The utility model is related to DC-DC power source technical field, more specifically, the utility model, which is related to one kind, has protection electricity
The DC-DC power module on road and the electronic equipment for being provided with this kind of DC-DC power module.
Background technology
DC-DC power module is the module for carrying out DC voltage conversion, such as is 3.3V electricity by the 5V voltage conversions of input
Pressure output, thinks 3.3V electricity consumption load supplying, therefore, DC-DC power source is universally present in various electronic equipments.
DC-DC power module in use often problem appear to is that, if with electric loading occur short circuit burn out, then
DC-DC power module can be also damaged, and other with electric loading also can not normal work, this be due to electric loading occur it is short
Instantaneous large-current is produced during road, so as to cause the output pin of upper DC-DC power module chips to damage caused, this will make
Obtain DC-DC power module directly to scrap and need to re-replace, and then add maintenance cost.
Utility model content
One purpose of the utility model embodiment is to provide a kind of DC-DC power module with protection circuit.
According to first aspect of the present utility model there is provided a kind of DC-DC power module, including DC-DC conversion chips and
Power inductance, the power inductance is connected to the switch pin and the electricity of the DC-DC power module of the DC-DC conversion chips
Between source output terminal, the DC-DC power module also includes：Passive resonant circuit, voltage comparator circuit and enable control circuit；
The passive resonant circuit includes the resonant inductance for being used to receive the electromagnetic energy that the power inductance is produced, the passive resonance
Circuit is arranged to provide the voltage signal that reflection flows through the size of current of the power inductance to the voltage comparator circuit；Institute
Voltage comparator circuit is stated to be arranged to the magnitude of voltage of the voltage signal and the reference voltage of setting being compared, and described
Magnitude of voltage exports first switch signal when being more than the reference voltage；It is described enable control circuit be arranged to receive it is described
During first switch signal the signal of the DC-DC conversion chips is closed to the enable pin output of the DC-DC conversion chips.
Optionally, the passive resonant circuit also include resonant capacitance and resonant resistance, the resonant capacitance with it is described
Resonant resistance is connected in parallel between the two ends of the resonant inductance.
Optionally, the power inductance and the resonant inductance just to and be disposed adjacent.
Optionally, the voltage comparator circuit includes voltage comparator and reference voltage circuit, the passive resonance electricity
Road is arranged to provide the voltage signal to the first input end of the voltage comparator, and the reference voltage circuit is set
For to the second input output reference voltage of the voltage comparator.
Optionally, the reference voltage circuit includes the first partial pressure unit and the second partial pressure unit, first partial pressure
Unit is connected between power end and second input, and second partial pressure unit is connected to second input with connecing
Between ground terminal.
Optionally, the control circuit that enables includes triode, and the base stage of the triode receives the first switch
Signal.
Optionally, the DC-DC conversion chips are that high level enables chip, and the triode is NPN type triode, institute
First switch signal is stated for high level signal, the signal of the closing DC-DC conversion chips is low level signal；It is described
The colelctor electrode of NPN type triode is connected with the enable pin, and the emitter stage of the NPN type triode connects with the earth terminal
Connect.
According to second aspect of the present utility model, a kind of electronic equipment is additionally provided, it is included according to of the present utility model
DC-DC power module described in first aspect.
Optionally, the electronic equipment also includes audio coding decoding chip, and the power supply of the DC-DC conversion chips is exported
Pin is connected with the power input pin of the audio coding decoding chip.
Optionally, the electronic equipment is virtual reality device.
A beneficial effect of the present utility model is that DC-DC power module of the present utility model is former using electromagnetic induction
Reason, the resonant control circuit mutually sensed with the power inductance of DC-DC conversion chips, Jin Erneng are constituted by simple peripheral circuit
Enough detections that load current is realized on the premise of circuit power consumption is not increased substantially；On this basis, DC-DC of the present utility model
Power module leads to when detecting high current and enables enable pin output closing DC-DC of the control circuit to DC-DC conversion chips
The signal of conversion chip, so that DC-DC conversion chips stop work immediately when load is because of the reasons such as short circuit generation instantaneous large-current
Make, so as to play a part of protecting DC-DC conversion chips.
It is of the present utility model other by referring to the drawings to the detailed description of exemplary embodiment of the present utility model
Feature and its advantage will be made apparent from.
Brief description of the drawings
The accompanying drawing for being combined in the description and constituting a part for specification shows embodiment of the present utility model, and
And be used to explain principle of the present utility model together with its explanation.
Fig. 1 is the classical circuit theory diagrams of DC-DC power module；
Fig. 2 is a kind of circuit theory diagrams of embodiment according to DC-DC power module of the present utility model；
Fig. 3 is a kind of circuit theory diagrams of embodiment according to electronic equipment of the present utility model.
Description of reference numerals：
U1：DC-DC conversion chips； U2：Passive resonant circuit；
U4：Voltage comparator circuit； U5：Enable control circuit；
SW：Switch pin； Vin：Power input pin；
ADJ：Voltage-regulation pin； EN：Enable pin；
OUT：Power supply output pin； Vout：Power output end；
VCC：Power end； GND：Earth terminal；
R1：Pull-up resistor； U3：Voltage comparator；
R3、R4、R5、R6：Resistance； Q1：NPN triode；
U310：DC-DC power module； U320：Audio coding decoding chip；
U330：Processor； U340：USB interface.
Embodiment
Various exemplary embodiments of the present utility model are described in detail now with reference to accompanying drawing.It should be noted that：Unless another
Illustrate outside, the part and the positioned opposite of step, numerical expression and numerical value otherwise illustrated in these embodiments is not limited
Make scope of the present utility model.
The description only actually at least one exemplary embodiment is illustrative below, never as to this practicality
New and its application or any limitation used.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
In the case of, the technology, method and apparatus should be considered as a part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.
Fig. 1 is a kind of classical circuit theory diagrams of DC-DC power module.
According to Fig. 1, the DC-DC power module includes DC-DC conversion chips U1, power inductance L1, resistance R1, resistance
R3 and resistance R4.
DC-DC conversion chips U1 has power input pin Vin, power supply output pin OUT, enable pin EN, switching tube
Pin SW and voltage-regulation pin ADJ etc..
Above-mentioned power input pin Vin is used to connect input power Vbus as the power input of DC-DC power module.
DC-DC conversion chips U1 in Fig. 1 enables for high level, and therefore, above-mentioned enable pin EN can be through pull-up resistor
R1 is connected with input power Vbus, so that DC-DC conversion chips U1 is in running order.
Above-mentioned switch pin SW via power inductance L1 and DC-DC power module power output end Vout connections.The work(
Rate inductance L1 is the indispensable energy storage afterflow inductance of DC-DC power module.
The power output end Vout of DC-DC power module is connected with DC-DC conversion chips U1 power supply output pin OUT.
Above-mentioned resistance R3 and resistance R4 as divider resistance be connected in series in power output end Vout and earth terminal GND it
Between, and the dividing point between resistance R3 and resistance R4 is then connected with voltage-regulation pin ADJ.
Because this kind of DC-DC power module shown in Fig. 1 does not have high current protection circuit, therefore, exported with power supply
With electric loading can be occurred for when being burnt out with electric loading generation short circuit of end Vout connections, DC-DC power module the wink that short circuit is produced
Between high current damage.
In order to solve the problem of DC-DC power module can be damaged by the instantaneous large-current that short circuit generation occurs with electric loading,
The utility model provides a kind of DC-DC power module with protection circuit, and Fig. 2 is according to DC-DC of the present utility model electricity
A kind of circuit theory diagrams of embodiment of source module.
According to Fig. 2, a kind of embodiment of the utility model DC-DC power module is in DC-DC power module shown in Fig. 1
On the basis of, add protection circuit.
The protection circuit includes passive resonant circuit U2, voltage comparator circuit U4 and enables control circuit U 5.
Above-mentioned passive resonant circuit U2 includes being used for the resonant inductance L2 for the electromagnetic energy that receiving power inductance L1 is produced.By
Increase in power inductance L1 electromagnetic energy with the increase for the electric current for flowing through power inductance L1, therefore, passive resonant circuit
U2 can produce the voltage signal that reflection flows through power inductance L1 size of current.
In order to improve the electromagnetic energy that resonant inductance L2 is received in the same circumstances, and then reaction sensitivity is improved, should
Power inductance L1 can with resonant inductance L2 just to and be disposed adjacent.
In this embodiment, passive resonant circuit U2 can use antiresonant circuit.
Further, in this embodiment, passive resonant circuit U2 can also include resonant capacitance C1 and resonant resistance
R2, wherein, resonant capacitance and resonant resistance R2 are connected in parallel between resonant inductance L2 two ends.
Passive resonant circuit U2 is arranged to provide the electric current that reflection flows through power inductance L1 to voltage comparator circuit U4
The voltage signal of size, with compared with the reference voltage V 1 that voltage comparator circuit U4 is set.
The reference voltage V 1 that voltage comparator circuit U4 is arranged to by the magnitude of voltage of the voltage signal with setting is compared
Compared with, and export first switch signal when magnitude of voltage is more than the reference voltage V 1.
Enable control circuit U 5 is arranged to the making to DC-DC conversion chips U1 when receiving the first switch signal
DC-DC conversion chips U1 signal is closed in the EN outputs of energy pin.
In the embodiment shown in Figure 2, DC-DC conversion chips U1 is that high level enables chip, therefore, closing DC-DC
Conversion chip U1 signal is low level signal, and the level of first switch signal height then can control circuit according to enabling
U5 particular circuit configurations are set.Therefore, the enable pin EN for controlling circuit U 5 to be connected to DC-DC conversion chips U1 will can be enabled
Between earth terminal GND.
In the embodiment shown in Figure 2, enable control circuit U 5 can include NPN triode Q1, the NPN triode Q1
Colelctor electrode be connected with enable pin EN, emitter stage and earth terminal GND connections and base stage receive first switch signal.Here, should
First switch signal is high level signal, now, NPN triode Q1 conducting, enables control circuit U 5 by enable pin EN electricity
Horizontal drawing is low, and then exports low level signal to enable pin EN, to close DC-DC conversion chips U1.
In the embodiment shown in Figure 2, voltage comparator circuit U4 further comprises voltage comparator U3 and reference voltage
Circuit.
Above-mentioned passive resonant circuit U2 exports voltage signal to voltage comparator U3 in-phase input end.
Said reference potential circuit U4 is arranged to the inverting input output reference voltage V1 to voltage comparator U3.
Reference voltage circuit U4 may further include the first partial pressure unit and the second partial pressure unit, the first partial pressure list
Member is connected between power end VCC and inverting input, second partial pressure unit be connected to inverting input and earth terminal GND it
Between.So, just reference voltage circuit can be adjusted by adjusting the resistance value ratio between the first partial pressure unit and the second partial pressure unit
The numerical value of the reference voltage V 1 of U4 outputs.
In the embodiment shown in Figure 2, the first partial pressure unit includes resistance R5, and the second partial pressure unit includes resistance R6.
In the embodiment shown in Figure 2, the circuit protection principle of the utility model DC-DC power module is：
If：During DC-DC power module normal work, switch pin SW working frequency is that 100KHZ, electric current are 1A, due to
Resonant inductance L2 serves as the effect of antenna in passive resonant circuit U2, when receiving normal 100KHZ signals, passive resonance
Circuit U 2 can produce voltage V01 on resistance R2.By the resistance for selecting resistance R5 and resistance R6 so that reference voltage circuit U4
The reference voltage V 1 of output is more than voltage V01.So, in normal operating conditions, because reference voltage V 1 is more than voltage VO1, because
This, voltage comparator U3 output low level signals, so that NPN triode Q1 is ended, DC-DC conversion chips U1 enable pin EN
Keep high level, DC-DC power module normal work.
In the case that circuit load appearance short circuit or void are short, flowing through power inductance L1 electric current can increase considerably,
This can cause the electromagnetic energy increase that passive resonant circuit U2 resonant inductance L2 is received, so as to directly result in passive resonance electricity
The magnitude of voltage for the voltage signal V0 that road U2 is produced is increased above reference voltage V 1, now, and voltage comparator U3 will export high electricity
Ordinary mail number to the base stage of NPN triode Q1 causes NPN triode Q1 to turn on, and then enable pin EN level is dragged down into company, DC-
DC conversion chips U1 will be stopped, it is achieved thereby that the rapid defencive function of circuit.
As can be seen here, the numerical value of reference voltage V 1 is properly selected according to the DC-DC conversion chips U1 abilities for bearing electric current,
Just DC-DC conversion chips U2 can be protected not damaged by transient high-current.
According to DC-DC power module of the present utility model, because passive resonant circuit U2 is induced power inductance L1 electricity
Work is flowed, so power consumption itself is extremely low, therefore, DC-DC power module of the present utility model can be used to complete machine well
In the higher design of power consumption requirements.
In a further embodiment, DC-DC conversion chips U1 can also be that low level is enabled, and this can be reference voltage electricity
Road U4 is to voltage comparator U3 in-phase input end output reference voltage V1, and passive resonant circuit U2 is to voltage comparator U3's
Inverting input output reflection flows through the voltage signal of power inductance L1 size of current, so that NPN triode Q1 is in normal work
Make to tend to remain under state, and occurring ending when high current is abnormal, and then enable pin EN level is driven high,
Now, DC-DC conversion chips U1 will be stopped.
In a further embodiment, above-mentioned enable control circuit U 5 can also realize that switch is made using at least one metal-oxide-semiconductor
With.
In a further embodiment, above-mentioned enable control circuit U 5 can also include PNP type triode.
In a further embodiment, voltage comparator U3 can be set according to DC-DC conversion chips U1 enable level
The input and voltage comparator U3 for receiving reference voltage V 1 receive the input for the voltage signal that passive resonant circuit U2 is exported
End.
In a further embodiment, voltage comparator circuit U4 be able to can be compared including MCU etc. and according to comparing knot
The device of fruit output control signal.
The utility model additionally provides a kind of electronic equipment, and the electronic equipment includes any of the above DC-DC power module.
Fig. 3 is a kind of circuit theory diagrams of embodiment according to the utility model electronic equipment.
According to Fig. 3, the electronic equipment includes DC-DC power module U310 and audio coding decoding chip (Audio
Codec)U320。
Audio coding decoding chip U320 is used as DC-DC power module U310 load, its power input pin Vin1 and DC-
DC power module U310 power output end Vout connections.
When audio coding decoding chip U320 generation short circuits are burnt out and then produce instantaneous large-current, DC-DC power module
U310 will be stopped by the protective effect of its own protection circuit, and when audio coding decoding chip U320 is replaced, can be with
Automatic state of resuming work.
The electronic equipment can also include processor U330 and USB interface U340, and processor U330 can pass through I2S buses
It is connected with audio coding decoding chip U320 I2S pins, to transmit audio signal.USB interface U340 can be DC-DC power source mould
Block U310 power input Vin provides input power Vbus.
USB interface U340 can be communicated to connect with processor U330, to carry out the transmission of data, instruction etc..
The enable control signal that enable pin EN can be exported with reception processing device U330, so that DC-DC power module U310
Working condition be also controlled by processor U330.
The electronic equipment for example can be virtual reality device, mobile phone, tablet personal computer, Intelligent worn device etc..
The electronic equipment can also be other any equipment for being provided with DC-DC power module U310.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Point cross-reference, what each embodiment was stressed is the difference with other embodiment, and each embodiment
It can be used alone or be combined with each other as needed.
Although some specific embodiments of the present utility model are described in detail by example, this area
It is to be understood by the skilled artisans that example above is merely to illustrate, rather than in order to limit scope of the present utility model.This
Field it is to be understood by the skilled artisans that can be in the case where not departing from scope and spirit of the present utility model, to above example
Modify.Scope of the present utility model is defined by the following claims.
Claims (10)
1. a kind of DC-DC power module, including DC-DC conversion chips and power inductance, the power inductance are connected to the DC-
Between the switch pin of DC conversion chips and the power output end of the DC-DC power module, it is characterised in that the DC-DC
Power module also includes：Passive resonant circuit, voltage comparator circuit and enable control circuit；The passive resonant circuit includes using
In the resonant inductance for receiving the electromagnetic energy that the power inductance is produced, the passive resonant circuit is arranged to the voltage
Comparison circuit provides the voltage signal that reflection flows through the size of current of the power inductance；The voltage comparator circuit is arranged to
The magnitude of voltage of the voltage signal and the reference voltage of setting are compared, and are more than the reference voltage in the magnitude of voltage
When export first switch signal；The control circuit that enables is arranged to when receiving the first switch signal to described
The signal of the DC-DC conversion chips is closed in the enable pin output of DC-DC conversion chips.
2. DC-DC power module according to claim 1, it is characterised in that the passive resonant circuit also includes resonance
Electric capacity and resonant resistance, the resonant capacitance and the resonant resistance are connected in parallel between the two ends of the resonant inductance.
3. DC-DC power module according to claim 1, it is characterised in that the power inductance and the resonant inductance
Just to and be disposed adjacent.
4. DC-DC power module according to claim 1, it is characterised in that the voltage comparator circuit includes voltage ratio
Compared with device and reference voltage circuit, the passive resonant circuit is arranged to provide institute to the first input end of the voltage comparator
Voltage signal is stated, the reference voltage circuit is arranged to the second input output reference voltage to the voltage comparator.
5. DC-DC power module according to claim 4, it is characterised in that the reference voltage circuit includes first point
Unit and the second partial pressure unit are pressed, first partial pressure unit is connected between power end and second input, described the
Two partial pressure units are connected between second input and earth terminal.
6. DC-DC power module according to any one of claim 1 to 5, it is characterised in that the enable controls circuit
Including triode, the base stage of the triode receives the first switch signal.
7. DC-DC power module according to claim 6, it is characterised in that the DC-DC conversion chips make for high level
Energy chip, the triode is NPN type triode, and the first switch signal is high level signal, the closing DC-DC
The signal of conversion chip is low level signal；The colelctor electrode of the NPN type triode is connected with the enable pin, the NPN
The emitter stage of type triode is connected with earth terminal.
8. a kind of electronic equipment, it is characterised in that including the DC-DC power module any one of claim 1 to 7.
9. electronic equipment according to claim 8, it is characterised in that the electronic equipment also includes audio coding decoding core
Piece, the power supply output pin of the DC-DC conversion chips is connected with the power input pin of the audio coding decoding chip.
10. electronic equipment according to claim 8, it is characterised in that the electronic equipment is virtual reality device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720167605.9U CN206619901U (en) | 2017-02-24 | 2017-02-24 | A kind of DC DC power modules and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720167605.9U CN206619901U (en) | 2017-02-24 | 2017-02-24 | A kind of DC DC power modules and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN206619901U true CN206619901U (en) | 2017-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720167605.9U Expired - Fee Related CN206619901U (en) | 2017-02-24 | 2017-02-24 | A kind of DC DC power modules and electronic equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323719A (en) * | 2019-07-22 | 2019-10-11 | 武汉洲际电讯科技股份有限公司 | A kind of Switching Power Supply output is hot-swappable and is reversely connected short-circuit protection circuit |
| CN111257792A (en) * | 2018-11-30 | 2020-06-09 | 中兴通讯股份有限公司 | Detection and protection circuit of active device, power supply circuit and power supply method |
| CN114465206A (en) * | 2022-01-06 | 2022-05-10 | 浙江科睿微电子技术有限公司 | Self-recovery overcurrent protection circuit of BUCK converter |
-
2017
- 2017-02-24 CN CN201720167605.9U patent/CN206619901U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257792A (en) * | 2018-11-30 | 2020-06-09 | 中兴通讯股份有限公司 | Detection and protection circuit of active device, power supply circuit and power supply method |
| CN110323719A (en) * | 2019-07-22 | 2019-10-11 | 武汉洲际电讯科技股份有限公司 | A kind of Switching Power Supply output is hot-swappable and is reversely connected short-circuit protection circuit |
| CN114465206A (en) * | 2022-01-06 | 2022-05-10 | 浙江科睿微电子技术有限公司 | Self-recovery overcurrent protection circuit of BUCK converter |
| CN114465206B (en) * | 2022-01-06 | 2024-03-12 | 浙江科睿微电子技术有限公司 | Self-recovery overcurrent protection circuit of BUCK converter |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201010 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee before: Weifang Goertek Electronics Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171107 |