CN103973087A - Power-down holding circuit - Google Patents

Power-down holding circuit Download PDF

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Publication number
CN103973087A
CN103973087A CN201310046097.5A CN201310046097A CN103973087A CN 103973087 A CN103973087 A CN 103973087A CN 201310046097 A CN201310046097 A CN 201310046097A CN 103973087 A CN103973087 A CN 103973087A
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China
Prior art keywords
circuit
power
voltage
positive
boost circuit
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Pending
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CN201310046097.5A
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Chinese (zh)
Inventor
左志岭
苑永峰
董翔
韦鸿任
王德举
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ZTE Corp
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ZTE Corp
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Priority to CN201310046097.5A priority Critical patent/CN103973087A/en
Publication of CN103973087A publication Critical patent/CN103973087A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a power-down holding circuit which comprises an energy storage circuit and a Boost circuit. The energy storage circuit is connected with a positive input end and a negative input end of a power source, and the Boost circuit is connected with the positive input end and the negative input end of the power source, a positive voltage output end and a negative voltage output end. The power-down holding circuit is characterized by further comprising a power-down detection and control circuit and a switch circuit, the power-down detection and control circuit is connected with the positive input end and the negative input end of the power source; first control signals and Boost circuit enable signals are outputted if the power-down detection and control circuit detects that voltages of the power source are smaller than a preset threshold value, or second control signals and Boost circuit disable signals are outputted if the power-down detection and control circuit detects that the voltages of the power source are not smaller than the preset threshold value; the switch circuit is connected with the positive input end of the power source and the positive voltage output end, is opened when the first control signals are received and is closed when the second control signals are received; the Boost circuit is in a working state when the enable signals are received, and is in a non-working state when the disable signals are received. The power-down holding circuit has the advantage that energy consumed by the power-down holding circuit can be reduced when the power source works normally.

Description

A kind of power-down retaining circuit
Technical field
The present invention relates to power technique fields, in particular a kind of power-down retaining circuit.
Background technology
The in the situation that of power-off suddenly, many communication systems and server system have little time to make a response, thereby cause the loss of data or the interruption of service.Therefore, more system requirements power supplies can provide power down to keep function, be the power supply that power supply still can maintain a period of time after system is sent power fail warning signal, so that system, to the power down action of making a response, is avoided the loss of data or running status.
Boost circuit (switch DC booster circuit) is widely used in power down maintenance function now, between DC power supply and rear class power supply circuits, add storage capacitor and Boost circuit, Boost circuit can rise to voltage lower on storage capacitor higher output voltage in Boost circuit output capacitance and maintain the sufficiently long hold during power off time.
As shown in Figure 1, power-down retaining circuit comprises the storage capacitor being connected between the positive and negative input of power supply, and is connected to the Boost circuit between the positive and negative input of power supply and the positive and negative output of voltage; Wherein, voltage positive output end (Vo+) is connected with late-class circuit positive input terminal, voltage negative output (Vo-) is connected with late-class circuit negative input end, power supply positive input terminal (Vi+) is connected with DC power supply Vin is anodal, power-input (Vi-) is connected with DC power supply Vin negative pole, and power-input is connected with voltage negative output;
Wherein, Boost circuit comprises inductance L 1, switching device Q1 (field effect transistor metal-oxide-semiconductor), diode D1 and capacitor C 1, wherein, one end of inductance L 1 is connected with power supply positive input terminal, the other end of inductance L 1 is connected with the anode of diode D1, the negative electrode of diode D1 is connected with voltage positive output end, and switching device Q1 is connected between the anode and power-input of diode D1, and capacitor C 1 is connected between the positive and negative output of voltage;
When Boost circuit is in running order, frequency conducting and the cut-off of control signal CON control switch device Q1 to fix, in the time of CON control switch device Q1 conducting, input current flows through inductance L 1, storage power in inductance, diode is used for preventing that capacitor C 1 from discharging by switching device Q1, in the time that CON control switch device Q1 ends, DC power supply Vin and storage capacitor C2 and inductance L 1 charge to capacitor C 1, constantly conducting of CON control switch device Q1 and cut-off, the voltage at capacitor C 1 two ends is raised above the voltage on storage capacitor C2.Boost circuit is in the time of non operating state, and switching device Q1 is all the time in cut-off state.
Before power-down retaining circuit is not introduced Boost circuit, suppose that storage capacitor C2 capacity is C, tank voltage is V, and rear class power supply circuits under-voltage protection point is V 1, the energy keeping for power down is Q 1=1/2C (V 2-V 1 2.Power-down retaining circuit is introduced after Boost circuit, when the upper lower voltage of storage capacitor C2 is to V 1time, Boost circuit by the energy on storage capacitor C2 by continuing to provide power down to postpone after boosting, until the lower voltage on storage capacitor C2 compares V 1lower electrical voltage point V 2(the electrical voltage point V that this is lower 2even if also cannot reach the under-voltage protection point V of DC/DC circuit after boosting by Boost circuit 1), therefore, the energy Q keeping for power down 2=1/2C (V 2-V 2 2).Obviously, V 2< V 1, Q 2> Q 1, therefore, power-down retaining circuit can provide more power down to keep energy after introducing Boost circuit, has extended the power down retention time.
But the inductance of Boost circuit and diode are serially connected on the power supply circuits of DC power supply, even if power down does not occur power supply, on the inductance of Boost circuit and diode, also can produce loss, reduce the efficiency of power supply.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of power-down retaining circuit, consumes the energy on power-down retaining circuit can reduce power supply and normally work time, improves the service efficiency of power supply.
In order to solve the problems of the technologies described above, the invention provides a kind of power-down retaining circuit, comprise the accumulator being connected between the positive and negative input of power supply, and be connected to the Boost circuit between the positive and negative input of power supply and the positive and negative output of voltage, it is characterized in that, described power-down retaining circuit also comprises:
Detection of power loss and control circuit, be connected between the positive and negative input of power supply, as detect when supply voltage is less than predetermined threshold value, output the first control signal and Boost circuit enable signal, otherwise output the second control signal and Boost circuit remove enable signal;
Switching circuit, is connected between power supply positive input terminal and voltage positive output end, and while receiving described the first control signal, switching circuit disconnects, switching circuit conducting while receiving described the second control signal;
In running order when described Boost circuit receives described Boost circuit enable signal, when receiving described Boost circuit and removing enable signal in non operating state.
Further, described detection of power loss and control circuit, comprising: collecting unit and control unit;
Described collecting unit, comprise resistance R 1 and resistance R 2, the first end of described R1 is connected with the power supply positive input terminal of power-down retaining circuit, and the second end of described R1 is connected with the first end of resistance R 2, and the second end of described R2 is connected with the power-input of power-down retaining circuit;
Described control unit, for judging whether the voltage at resistance R 2 two ends is less than predetermined threshold value, as be less than predetermined threshold value, export the first control signal and Boost circuit enable signal, otherwise output the second control signal and Boost circuit remove enable signal, otherwise output the second control signal and Boost circuit remove enable signal.
Further, described control unit is single-chip microcomputer.
Further, described control unit judges that whether the voltage at resistance R 2 two ends is less than predetermined threshold value, comprising:
Described control unit is by the voltage at the resistance R collecting 2 two ends, and the reference voltage built-in with single-chip microcomputer compares, and judges whether the voltage at resistance R 2 two ends is less than described reference voltage.
Further, the power-input of described power-down retaining circuit is connected with voltage negative output.
Further, described accumulator comprises: capacitor C 2.
Further, described Boost circuit comprises inductance L 1, switching device Q1, diode D1 and capacitor C 1;
Wherein, one end of inductance L 1 is connected with described power supply positive input terminal, the other end of inductance L 1 is connected with the anode of diode D1, the negative electrode of diode D1 is connected with described voltage positive output end, switching device Q1 is connected between the anode and described power-input of diode D1, and capacitor C 1 is connected between the positive and negative output of voltage.
Further, described switching device Q1 is field effect transistor metal-oxide-semiconductor.
Compared with prior art, a kind of power-down retaining circuit provided by the invention, by increasing the switching circuit for bypass Boost circuit between the power supply positive input terminal at power-down retaining circuit and voltage positive output end, and introducing detection of power loss and control circuit, can be in the time that power supply be normally worked, by switching circuit bypass Boost circuit, in the time of power supply power-fail, make Boost circuit normally work, consume the energy on power-down retaining circuit thereby reduce when power supply is normally worked, improve the service efficiency of power supply.
Brief description of the drawings
Fig. 1 is the electrical block diagram of the power-down retaining circuit with Boost circuit in prior art.
Fig. 2 is the module diagram of the power-down retaining circuit of the embodiment of the present invention.
Fig. 3 is the electrical block diagram of the power-down retaining circuit of the embodiment of the present invention.
Fig. 4 is the detection of power loss of the embodiment of the present invention and the structural representation of control circuit.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the combination in any mutually of the feature in embodiment and embodiment in the application.
As shown in Figure 2, the embodiment of the present invention provides a kind of power-down retaining circuit, comprises the accumulator being connected between the positive and negative input of power supply, and is connected to the Boost circuit between the positive and negative input of power supply and the positive and negative output of voltage, it is characterized in that, described power-down retaining circuit also comprises:
Detection of power loss and control circuit, be connected between the positive and negative input of power supply, as detect when supply voltage is less than predetermined threshold value, output the first control signal and Boost circuit enable signal, otherwise output the second control signal and Boost circuit remove enable signal;
Switching circuit, is connected between power supply positive input terminal and voltage positive output end, and while receiving described the first control signal, switching circuit disconnects, switching circuit conducting while receiving described the second control signal;
In running order when described Boost circuit receives described Boost circuit enable signal, when receiving described Boost circuit and removing enable signal in non operating state.
The method further comprises following characteristics:
Wherein, as shown in Figure 3, the voltage positive output end (Vo+) of power-down retaining circuit is connected with late-class circuit positive input terminal, voltage negative output (Vo-) is connected with late-class circuit negative input end, the power supply positive input terminal (Vi+) of power-down retaining circuit is connected with DC power anode, power-input (Vi-) is connected with DC power cathode, and power-input is connected with voltage negative output;
Wherein, as shown in Figure 3, Boost circuit comprises inductance L 1, switching device Q1, diode D1 and capacitor C 1, wherein, one end of inductance L 1 is connected with power supply positive input terminal, and the other end of inductance L 1 is connected with the anode of diode D1, and the negative electrode of diode D1 is connected with voltage positive output end, switching device Q1 is connected between the anode and power-input of diode D1, and capacitor C 1 is connected between the positive and negative output of voltage;
Wherein, the switching device Q1 in Boost circuit is field effect transistor metal-oxide-semiconductor;
Wherein, described accumulator comprises: capacitor C 2;
Wherein, as shown in Figure 3, when the voltage at storage capacitor C2 two ends is not less than predetermined threshold value, Boost circuit goes at Boost circuit under the control of enable signal in non operating state, switching circuit under the control of the second control signal in conducting state, the inductance L 1 of Boost circuit and diode D1 are by switching circuit bypass, electric current mainly flows through from switching circuit, because the conducting resistance of switching circuit is far smaller than the inductance L 1 of Boost circuit and the impedance of diode D1, therefore, after switching circuit conducting, be equal to a wire, reduce the loss of power-down retaining circuit to DC power supply.
After DC power supply power down, the voltage at storage capacitor C2 two ends can constantly decline, in the time that the lower voltage at storage capacitor C2 two ends arrives lower than predetermined threshold value, Boost circuit is in running order under the control of Boost circuit enable signal, switching circuit under the control of the first control signal in off-state, the voltage at the output capacitance C1 two ends of Boost circuit is elevated, and has extended the time for late-class circuit power supply.
Wherein, as shown in Figure 4, described detection of power loss and control circuit, comprising: collecting unit and control unit;
Described collecting unit, comprise resistance R 1 and resistance R 2, the first end of described R1 is connected with the power supply positive input terminal of power-down retaining circuit, and the second end of described R1 is connected with the first end of resistance R 2, and the second end of described R2 is connected with the power-input of power-down retaining circuit;
Described control unit, for judging whether the voltage at resistance R 2 two ends is less than predetermined threshold value, as be less than predetermined threshold value, export the first control signal and Boost circuit enable signal, otherwise output the second control signal and Boost circuit remove enable signal, otherwise output the second control signal and Boost circuit remove enable signal;
Wherein, described control unit is single-chip microcomputer.
Wherein, described control unit judges that whether the voltage at resistance R 2 two ends is less than predetermined threshold value, comprising:
Described single-chip microcomputer is by the voltage at the resistance R collecting 2 two ends, and the reference voltage Vref built-in with single-chip microcomputer compares, and judges whether the voltage at resistance R 2 two ends is less than described reference voltage Vref.
A kind of power-down retaining circuit that above-described embodiment provides, by increasing the switching circuit for bypass Boost circuit between the power supply positive input terminal at power-down retaining circuit and voltage positive output end, and introducing detection of power loss and control circuit, can be in the time that power supply be normally worked, by switching circuit bypass Boost circuit, in the time of power supply power-fail, make Boost circuit normally work, consume the energy on power-down retaining circuit thereby reduce when power supply is normally worked, improve the service efficiency of power supply.
One of ordinary skill in the art will appreciate that all or part of step in said method can carry out instruction related hardware by program and complete, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits, and correspondingly, the each module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
It should be noted that; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (8)

1. a power-down retaining circuit, comprises the accumulator being connected between the positive and negative input of power supply, and is connected to the Boost circuit between the positive and negative input of power supply and the positive and negative output of voltage, it is characterized in that, described power-down retaining circuit also comprises:
Detection of power loss and control circuit, be connected between the positive and negative input of power supply, as detect when supply voltage is less than predetermined threshold value, output the first control signal and Boost circuit enable signal, otherwise output the second control signal and Boost circuit remove enable signal;
Switching circuit, is connected between power supply positive input terminal and voltage positive output end, and while receiving described the first control signal, switching circuit disconnects, switching circuit conducting while receiving described the second control signal;
In running order when described Boost circuit receives described Boost circuit enable signal, when receiving described Boost circuit and removing enable signal in non operating state.
2. circuit as claimed in claim 1, is characterized in that:
Described detection of power loss and control circuit, comprising: collecting unit and control unit;
Described collecting unit, comprise resistance R 1 and resistance R 2, the first end of described R1 is connected with the power supply positive input terminal of power-down retaining circuit, and the second end of described R1 is connected with the first end of resistance R 2, and the second end of described R2 is connected with the power-input of power-down retaining circuit;
Described control unit, for judging whether the voltage at resistance R 2 two ends is less than predetermined threshold value, as be less than predetermined threshold value, export the first control signal and Boost circuit enable signal, otherwise output the second control signal and Boost circuit remove enable signal, otherwise output the second control signal and Boost circuit remove enable signal.
3. circuit as claimed in claim 2, is characterized in that:
Described control unit is single-chip microcomputer.
4. circuit as claimed in claim 3, is characterized in that:
Described control unit judges that whether the voltage at resistance R 2 two ends is less than predetermined threshold value, comprising:
Described control unit is by the voltage at the resistance R collecting 2 two ends, and the reference voltage built-in with single-chip microcomputer compares, and judges whether the voltage at resistance R 2 two ends is less than described reference voltage.
5. circuit as claimed in claim 1, is characterized in that:
The power-input of described power-down retaining circuit is connected with voltage negative output.
6. circuit as claimed in claim 1, is characterized in that:
Described accumulator comprises: capacitor C 2.
7. circuit as claimed in claim 1, is characterized in that:
Described Boost circuit comprises inductance L 1, switching device Q1, diode D1 and capacitor C 1;
Wherein, one end of inductance L 1 is connected with described power supply positive input terminal, the other end of inductance L 1 is connected with the anode of diode D1, the negative electrode of diode D1 is connected with described voltage positive output end, switching device Q1 is connected between the anode and described power-input of diode D1, and capacitor C 1 is connected between the positive and negative output of voltage.
8. circuit as claimed in claim 7, is characterized in that:
Described switching device Q1 is field effect transistor metal-oxide-semiconductor.
CN201310046097.5A 2013-02-05 2013-02-05 Power-down holding circuit Pending CN103973087A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105576968A (en) * 2015-12-08 2016-05-11 北京英赛德佳科技有限公司 DC power source having wide input voltage range
CN107834826A (en) * 2017-11-01 2018-03-23 中国航空无线电电子研究所 Energy supply control module
CN109391135A (en) * 2018-11-09 2019-02-26 华为数字技术(苏州)有限公司 A kind of power-down retaining circuit and Switching Power Supply
CN109885031A (en) * 2019-03-14 2019-06-14 四川海特亚美航空技术有限公司 The power down indicating fault holding circuit of aero-engine APU CTL
CN111800008A (en) * 2019-04-01 2020-10-20 Ls电气株式会社 Output voltage stabilizing device
CN113824325A (en) * 2021-08-17 2021-12-21 广州金升阳科技有限公司 Two-stage type switching power supply circuit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105576968A (en) * 2015-12-08 2016-05-11 北京英赛德佳科技有限公司 DC power source having wide input voltage range
CN107834826A (en) * 2017-11-01 2018-03-23 中国航空无线电电子研究所 Energy supply control module
CN107834826B (en) * 2017-11-01 2020-04-24 中国航空无线电电子研究所 Power supply control module
CN109391135A (en) * 2018-11-09 2019-02-26 华为数字技术(苏州)有限公司 A kind of power-down retaining circuit and Switching Power Supply
CN109885031A (en) * 2019-03-14 2019-06-14 四川海特亚美航空技术有限公司 The power down indicating fault holding circuit of aero-engine APU CTL
CN109885031B (en) * 2019-03-14 2022-03-15 四川海特亚美航空技术有限公司 Power failure fault indication retaining circuit of aero-engine auxiliary power device controller
CN111800008A (en) * 2019-04-01 2020-10-20 Ls电气株式会社 Output voltage stabilizing device
CN113824325A (en) * 2021-08-17 2021-12-21 广州金升阳科技有限公司 Two-stage type switching power supply circuit

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Application publication date: 20140806