CN103051044A - Power source power off maintaining circuit - Google Patents
Power source power off maintaining circuit Download PDFInfo
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- CN103051044A CN103051044A CN2012105238604A CN201210523860A CN103051044A CN 103051044 A CN103051044 A CN 103051044A CN 2012105238604 A CN2012105238604 A CN 2012105238604A CN 201210523860 A CN201210523860 A CN 201210523860A CN 103051044 A CN103051044 A CN 103051044A
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Abstract
The invention belongs to the field of avionics and particularly relates to a power source power off maintaining circuit. A main power source input channel circuit, a boosted circuit, an energy storage capacity charge circuit, an energy storage capacity discharge channel switch, an internal power source generation circuit, a channel switch control circuit, an input power source sampling circuit, a state control signal generation circuit and a power off timing circuit are arranged between a power source input end and a power source output end. The power source power off maintaining circuit is not influenced by fluctuation of power source input voltage, the capacity charge voltage can be stabilized at a fixed value; as the voltage at a capacity end is higher, the capacity energy density is improved, and the capacity use amount is greatly reduced; and a power off timing circuit is added, so that the power off maintaining time can be controlled, and the flexibility of design is improved.
Description
Technical field
The invention belongs to the avionics field, particularly relate to a kind of power cut-off holding circuit.
Background technology
Avionic device is normal to adopt a cover DC power supply, or adopts two cover DC power supply interleaved powers.When power supply outage, or during two cover power supply power switchings, the load electronic equipment can occur lastingly, or the situation of instant cut-off.Some are had the electronic equipment of specific (special) requirements, and when power supply cut off the power supply, electronic equipment should be able to maintenance work a period of time, electronic equipment can be at this moment between in make the defencive functions such as data backup; When the power supply instant cut-off, electronic equipment should not be subjected to the impact of power supply instant cut-off, keeps electronic equipment normal operation itself.As shown in Figure 1, traditional power cut-off holding circuit adopts large capacity storage capacitor, current-limiting resistance, discharge diode, anti-electric electricity capacity recharges diode design, its basic principle is to utilize the energy storage characteristic of electric capacity, reaches capacitor discharge when power cut-off, the purpose that works in order to keep electronic equipment.
There are following three large shortcomings in traditional power cut-off holding circuit: the first, and the electric capacity storage power is subjected to the impact of power input voltage larger.By the capacitance energy storage formula
As can be known, when fluctuation occurs power input voltage, the electric capacity storage power will change.The second, capacitive energy density is on the low side.Under the certain condition of capacitor's capacity, the electric capacity both end voltage is higher, and capacitive energy density is larger.In the design of conventional power source outage holding circuit, power input voltage often less than the electric capacity rated operational voltage half, causes capacitive energy density on the low side.The 3rd, outage is held time uncontrollable.Outage is held time and has been satisfied often fully loaded requirement, and under underloading or idle condition, outage is held time long, can't satisfy the repertoire requirement of power supply.
The designing requirement of holding time for reaching outage can be satisfied with the method for a plurality of Capacitance parallel connection energy storage and use needs.But the very big increase of the problem of thereupon the bringing cost that is electronic equipment own, volume, weight, and outage hold time more uncontrollable, this is difficult to accept in actual applications often.
Summary of the invention
Goal of the invention: the purpose of this invention is to provide a kind of novel power cut-off holding circuit, can overcome the existing defective of conventional power source outage holding circuit.
Technical scheme: a kind of power cut-off holding circuit, between power input and power output end, comprise main power source input channel circuit 1, booster circuit 2, energy storage capacitor charging circuit 3, storage capacitor discharge channel switch 4, internal electrical source generating circuit 5, channel switch control circuit 6, input power sample circuit 7, state control signal circuit for generating 8 and outage timing circuit 9, described booster circuit 2, after energy storage capacitor charging circuit 3 and 4 series connection of storage capacitor discharge channel switch, in parallel with main power source input channel circuit 1, the output of described booster circuit 2 and energy storage capacitor charging circuit 3 is connected with the input of internal electrical source generating circuit 5, the output of described input power sample circuit 7 is connected with the input of state control signal circuit for generating 8, the output of state control signal circuit for generating 8 is connected with the input of outage timing circuit 9 and channel switch control circuit 6 respectively, the output of outage timing circuit 9 is connected with the input of channel switch control circuit 6, and the output of channel switch control circuit 6 is connected with the input of storage capacitor discharge channel switch 4.
Main power source input channel circuit 1 plays the effect of power supply input channel, and plays and prevent that the storage capacitors energy from recharging the effect of power input.
Described internal electrical source generating circuit 5 is used for providing 5V voltage to channel switch control circuit 6, state control signal circuit for generating 8 and outage timing circuit 9.
Described channel switch control circuit 6 is for generation of the control signal of control storage capacitor discharge channel switch 4.
Described outage timing circuit 9 comprises crystal oscillator G1, counter D1, and trigger D3, comparator N2, the setting-up time of timing circuit 9 can pass through to set the frequency of oscillation of crystal oscillator G1, or the output of counter D1 is adjusted flexibly.
Beneficial effect: the present invention is not subjected to the impact of power input voltage fluctuation, and capacitor charging voltage can be stabilized in fixed value.Because capacitance terminal voltage is higher, improved the energy density of electric capacity, greatly reduced the usage quantity of electric capacity.The adding of outage timing circuit so that outage is held time is controlled, has improved the flexibility of design.Whole circuit working is independent, without any need for external input, is easy to the integrated of whole circuit and modularization production.The present invention also has the following advantages:
(1) capacitor charging voltage stabilization.
The charging voltage of electric capacity is supplied with by the output of booster circuit.In the practical application, the output voltage of booster circuit can be adjusted to fixed value according to actual needs, guarantees the stable of capacitor charging voltage with this.The input service voltage range of booster circuit can dynamically be adjusted equally, overcomes the impact that the power input voltage fluctuation brings with this.Therefore, the charging voltage of electric capacity will not in the impact that is subjected to the power supply input, can be stabilized in fixed value.
(2) reduce the electric capacity usage quantity, reduce small product size, weight and cost.
Take power input voltage as 28V, capacity is that the electric capacity of 24000 μ F is example.In the conventional power source outage holding circuit, the stored energy of electric capacity is that 9.4 Jiao are (according to formula
Calculate).If booster circuit is elevated to 44V with power input voltage, then the stored energy of electric capacity is 23.2 Jiao, compares conventional power source outage holding circuit, and the stored energy of electric capacity has improved nearly 2.5 times.Therefore, the introducing of booster circuit has reduced the usage quantity of electric capacity dramatically, has reduced volume, weight and the cost of product.
(3) outage is held time controlled.
The outage timing circuit introducing so that the outage hold time precisely controlled.In the practical application, according to design requirement, can hold time to outage arranges flexibly, makes it when satisfying fully loaded designing requirement, also can satisfy underloading or unloaded design needs.
(4) circuit is easy to integrated and modularization production.
The internal electrical source generating circuit adopts the output voltage of booster circuit and energy storage capacitor charging circuit as input power, even therefore input power outage, booster circuit quits work, the internal electrical source generating circuit also can adopt the energy of storage capacitor to work on, for the power cut-off holding circuit provides internal electric source.Therefore, whole circuit can work alone, and without any need for external input, is convenient to the integrated of circuit and modularization production.
Description of drawings
Fig. 1 is conventional power source outage holding circuit figure;
Fig. 2 is schematic block circuit diagram of the present invention;
Fig. 3 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done to describe in further detail, see also Fig. 1 to Fig. 3.
As shown in Figure 1, be conventional power source outage holding circuit, traditional power cut-off holding circuit adopts large capacity storage capacitor, current-limiting resistance, discharge diode, anti-electric electricity capacity recharges diode design, and its basic principle is to utilize the energy storage characteristic of electric capacity, reach capacitor discharge when power cut-off, the purpose that works in order to keep electronic equipment.
As shown in Figures 2 and 3, be schematic block circuit diagram of the present invention and circuit diagram, a kind of power cut-off holding circuit, between power input and power output end, comprise main power source input channel circuit 1, booster circuit 2, energy storage capacitor charging circuit 3, storage capacitor discharge channel switch 4, internal electrical source generating circuit 5, channel switch control circuit 6, input power sample circuit 7, state control signal circuit for generating 8 and outage timing circuit 9, described booster circuit 2, after energy storage capacitor charging circuit 3 and 4 series connection of storage capacitor discharge channel switch, in parallel with main power source input channel circuit 1, the output of described booster circuit 2 and energy storage capacitor charging circuit 3 is connected with the input of internal electrical source generating circuit 5, the output of described input power sample circuit 7 is connected with the input of state control signal circuit for generating 8, the output of state control signal circuit for generating 8 is connected with the input of outage timing circuit 9 and channel switch control circuit 6 respectively, the output of outage timing circuit 9 is connected with the input of channel switch control circuit 6, and the output of channel switch control circuit 6 is connected with the input of storage capacitor discharge channel switch 4.
Main power source input channel circuit 1 plays the effect of power supply input channel, and plays and prevent that the storage capacitors energy from recharging the effect of power input.During actual the use, main power source input channel circuit 1 is made of rectifier diode V4.Input when normal when power supply, V4 plays the effect of power supply input channel; When power cut-off, V4 plays and prevents that the storage capacitors energy from recharging the effect of power input.
During actual the use, energy storage capacitor charging circuit 3 can be by resistance R 8, diode V2, and storage capacitor C7 forms.During charging, by 7 chargings of 8 pairs of capacitor C of resistance R; During discharge, capacitor C 7 is by diode V2 discharge.
During actual the use, storage capacitor discharge channel switch 4 can be by N-channel MOS pipe V9, P channel MOS tube V7, V8, and resistance R 1, R11, voltage-stabiliser tube V1, diode V11 forms.When channel switch control circuit 6 output high level+5V, the grid of V9 and source voltage V
GSFor+5V, the V9 conducting.The output voltage of energy storage capacitor charging circuit 3 will be with V7, R1, and R11, V9 forms path.At this moment, metal-oxide-semiconductor V7, V8 will be obtained by voltage-stabiliser tube V1 the bias voltage of 1V, metal-oxide-semiconductor V7, V8 conducting, and storage capacitor discharge channel switch 4 closures, the storage capacitor energy obtains discharging.Otherwise, when channel switch control circuit 6 output low level V, the V9 cut-off, the output voltage of energy storage capacitor charging circuit 3 can't be with V7, R1, R11, V9 forms path, metal-oxide-semiconductor V7, V8 cut-off, storage capacitor discharge channel switch 4 disconnects.
Described internal electrical source generating circuit 5 is used for providing 5V voltage to channel switch control circuit 6, state control signal circuit for generating 8 and outage timing circuit 9.Internal electrical source generating circuit 5 adopts basic voltage-stabiliser tube voltage stabilizing circuit to design, can be by resistance R 9 during actual the use, and voltage-stabiliser tube V5, triode V6 forms.Because internal electrical source generating circuit 5 adopts the output voltage of booster circuit 2 and energy storage capacitor charging circuit 3 as input power, even therefore input power outage, booster circuit 2 quits work, internal electrical source generating circuit 5 also can adopt the energy of storage capacitor to work on, for the power cut-off holding circuit provides internal electric source.
Described channel switch control circuit 6 is for generation of the control signal of control storage capacitor discharge channel switch 4.During actual the use, channel switch control circuit 6 can be by pull-up resistor R23, triode V13, and XOR gate D5 forms, for generation of the control signal of control storage capacitor discharge channel switch 4.6 of channel switch control circuits may receive from state control signal circuit for generating 8, three kinds of composite signals of outage timing circuit 9, namely " disconnect, timing arrive (+5V; V) ", " (V, V) do not arrived in closure, timing ", " closed, timing to (V ,+5V) ".Under these three kinds of composite signals, channel switch control circuit 6 is exported respectively V ,+5V, and V controls voltage, and storage capacitor discharge channel switch 4 disconnects respectively under these three kinds control voltages, and closure disconnects the storage capacitor discharge channel.
During actual the use, input power sample circuit 7 can be comprised of resistance R 12, R13, is used for the sampling of input voltage dividing potential drop, and send state control signal circuit for generating 8 with sample voltage value.
During actual the use, state control signal circuit for generating 8 can be by comparator N1, and reference voltage arranges resistance R 14, R15, and pull-up resistor R17, hysteresis voltage arrange resistance R 16 and form.When power supply is inputted when normal, 8 outputs of state control signal circuit for generating " disconnect (+5V) " signal; When power supply input outage, state control signal circuit for generating 8 outputs " closed (V) " signal.R16 is used for hysteresis voltage is set, and prevents the frequent shake of input power, causes state control signal circuit for generating 8 false triggering to occur.
Described outage timing circuit 9 comprises crystal oscillator G1, counter D1, and trigger D3, comparator N2, the setting-up time of timing circuit 9 can pass through to set the frequency of oscillation of crystal oscillator G1, or the output of counter D1 is adjusted flexibly.During actual the use, also comprise resistance R 18, R19, R2, R21, R22.The setting-up time of timing circuit 9 can pass through to set the frequency of oscillation of crystal oscillator G1, or the output of counter D1 is adjusted flexibly.Behind the "off" signal of receiving state control signal circuit for generating 8, counter D1 and trigger D3 are clear, outage timing circuit 9 output " timing is not arrived " signals.Behind " closure " signal of receiving state control signal circuit for generating 8, counter D1 begins counting, if not yet count down to setting-up time, and trigger D3 output V voltage, timing circuit 9 output " timing is not arrived " signals namely cut off the power supply; If count down to setting-up time, trigger D3 triggers, and output+5V voltage, outage timing circuit 9 exports " timing is arrived " signal always, until after input power recovers normally again, receive the "off" signal from state control signal circuit for generating 8.
The course of work of the present invention is as follows:
(1) during the input power normal power supply.
By booster circuit 2, lower input supply voltage is transformed to fixing, higher direct voltage.With this voltage, 3 pairs of storage capacitors of energy storage capacitor charging circuit carry out constant voltage charge, charge complete after, the storage capacitor both end voltage will maintain stable state.Input power sample circuit 7 carries out voltage sample to power supply input in real time, and sample voltage value is delivered to state control signal circuit for generating 8.State control signal circuit for generating 8 judges that the power supply input is normal, sends the "off" control signal to channel switch control circuit 6 and outage timing circuit 9.Outage is after timing circuit 9 receives the "off" control signal, and timer resets, and sends simultaneously " timing not to " and controls signal to channel switch control circuit 6.Channel switch control circuit 6 receive from the "off" control signal of state control signal circuit for generating 8 and the outage timing circuit 9 " timing is not arrived " control signal after, disconnect storage capacitor discharge channel switch 4, the energy of storage capacitor can't be sent by storage capacitor discharge channel switch 4.Internal electrical source generating circuit 5 is for generation of outage holding circuit internal work power supply.At this moment, the power supply input provides Power supply through main power source input channel circuit 1 for load.
When (2) outage appears in input power.
Input power sample circuit 7 carries out voltage sample to power supply input in real time, and sample voltage value is delivered to state control signal circuit for generating 8.State control signal circuit for generating 8 is judged power supply input outage, sends " closure " control signal to channel switch control circuit 6 and outage timing circuit 9.Outage is after timing circuit 9 receives " closure " control signal, timer initiation, if timing is not to set point for timer, outage timing circuit 9 sends " timing not to " and controls signal to channel switch control circuit 6.Channel switch control circuit 6 receive from " closure " control signal of state control signal circuit for generating 8 and the outage timing circuit 9 " timing is not arrived " control signal after, closed storage capacitor discharge channel switch 4, the energy of storage capacitor is sent by storage capacitor discharge channel switch 4.When the timer timing when the set point, outage timing circuit 9 sends " timing to " and controls signal to channel switch control circuit 6; After channel switch control circuit 6 is received " timing to " control signal from " closure " control signal of state control signal circuit for generating 8 and outage timing circuit 9, disconnect storage capacitor discharge channel switch 4, the energy of storage capacitor can't be sent by storage capacitor discharge channel switch 4.
When outage appearred in power supply, booster circuit 2 quit work.The input power of internal electrical source generating circuit 5 transfers to be provided by the energy of storage capacitor, to keep working on of power cut-off holding circuit.Main power source input channel circuit 1 possessed and prevented that the storage capacitor energy from recharging the function to power input this moment.
When (3) input power recovers again.
Input power sample circuit 7 carries out voltage sample to power supply input in real time, and sample voltage value is delivered to state control signal circuit for generating 8.After state control signal circuit for generating 8 judges that the power supply input is normal, send the "off" control signal to channel switch control circuit 6 and outage timing circuit 9.Outage is after timing circuit 9 receives the "off" control signal, and timer resets, and sends simultaneously " timing not to " and controls signal to channel switch control circuit 6; Channel switch control circuit 6 receive from the "off" control signal of state control signal circuit for generating 8 and the outage timing circuit 9 " timing is not arrived " control signal after, disconnect storage capacitor discharge channel switch 4, the energy of storage capacitor can't be sent by storage capacitor discharge channel switch 4.Simultaneously, booster circuit 2 is resumed work, and lower input supply voltage is transformed to fixing, higher direct voltage.With this voltage, 3 pairs of storage capacitors of energy storage capacitor charging circuit carry out constant voltage charge, charge complete after, the storage capacitor both end voltage will maintain stable state.At this moment, the power supply input provides Power supply through main power source input channel circuit 1 for load.
The present invention is not subjected to the impact of power input voltage fluctuation, and capacitor charging voltage can be stabilized in fixed value.Because capacitance terminal voltage is higher, improved the energy density of electric capacity, greatly reduced the usage quantity of electric capacity.The adding of outage timing circuit so that outage is held time is controlled, has improved the flexibility of design.Whole circuit working is independent, without any need for external input, is easy to the integrated of whole circuit and modularization production.
Claims (6)
1. power cut-off holding circuit, it is characterized in that, between power input and power output end, comprise main power source input channel circuit [1], booster circuit [2], energy storage capacitor charging circuit [3], storage capacitor discharge channel switch [4], internal electrical source generating circuit [5], channel switch control circuit [6], input power sample circuit [7], state control signal circuit for generating [8] and outage timing circuit [9], described booster circuit [2], after energy storage capacitor charging circuit [3] and storage capacitor discharge channel switch [4] series connection, in parallel with main power source input channel circuit [1], the output of described booster circuit [2] and energy storage capacitor charging circuit [3] is connected with the input of internal electrical source generating circuit [5], the output of described input power sample circuit [7] is connected with the input of state control signal circuit for generating [8], the output of state control signal circuit for generating [8] is connected with the input of outage timing circuit [9] and channel switch control circuit [6] respectively, the output of outage timing circuit [9] is connected with the input of channel switch control circuit [6], and the output of channel switch control circuit [6] is connected with the input of storage capacitor discharge channel switch [4].
2. a kind of power cut-off holding circuit according to claim 1 is characterized in that, main power source input channel circuit [1] plays the effect of power supply input channel, and plays and prevent that the storage capacitors energy from recharging the effect of power input.
3. a kind of power cut-off holding circuit according to claim 2 is characterized in that, booster circuit [2] has adopted the BOOST topological structure, and the PWM pulse width modulating chip T1 that selects is LTC1871.
4. a kind of power cut-off holding circuit according to claim 3 is characterized in that, described internal electrical source generating circuit [5] is used for providing 5V voltage to channel switch control circuit [6], state control signal circuit for generating [8] and outage timing circuit [9].
5. a kind of power cut-off holding circuit according to claim 4 is characterized in that, described channel switch control circuit [6] is for generation of the control signal of control storage capacitor discharge channel switch [4].
6. a kind of power cut-off holding circuit according to claim 5, it is characterized in that, described outage timing circuit [9] comprises crystal oscillator G1, counter D1, trigger D3, comparator N2, the setting-up time of timing circuit [9] can pass through to set the frequency of oscillation of crystal oscillator G1, or the output of counter D1 is adjusted flexibly.
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| CN2012105238604A CN103051044A (en) | 2012-12-07 | 2012-12-07 | Power source power off maintaining circuit |
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| CN2012105238604A CN103051044A (en) | 2012-12-07 | 2012-12-07 | Power source power off maintaining circuit |
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Cited By (6)
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| CN104050733A (en) * | 2014-06-19 | 2014-09-17 | 北京华航海鹰新技术开发有限责任公司 | Audio recording system for aircraft |
| CN105846541A (en) * | 2016-05-23 | 2016-08-10 | 国神光电科技（上海）有限公司 | Power-down protection circuit |
| CN106468883A (en) * | 2015-08-20 | 2017-03-01 | 陕西千山航空电子有限责任公司 | A kind of trainer aircraft Electromechanical Management device |
| CN108532115A (en) * | 2018-03-30 | 2018-09-14 | 常熟长润智能科技有限公司 | PWM control systems for circular knitting machine control |
| CN110798085A (en) * | 2019-11-14 | 2020-02-14 | 青岛航天半导体研究所有限公司 | Improved input voltage circuit |
| WO2021051636A1 (en) * | 2019-09-17 | 2021-03-25 | 中兴通讯股份有限公司 | Power failure protection circuit and method, data protection method, and electronic product |
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| CN104050733A (en) * | 2014-06-19 | 2014-09-17 | 北京华航海鹰新技术开发有限责任公司 | Audio recording system for aircraft |
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| WO2021051636A1 (en) * | 2019-09-17 | 2021-03-25 | 中兴通讯股份有限公司 | Power failure protection circuit and method, data protection method, and electronic product |
| CN110798085A (en) * | 2019-11-14 | 2020-02-14 | 青岛航天半导体研究所有限公司 | Improved input voltage circuit |
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Application publication date: 20130417 |