CN217362655U - Power supply circuit with temporary power supply and charge-discharge control functions - Google Patents
Power supply circuit with temporary power supply and charge-discharge control functions Download PDFInfo
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- CN217362655U CN217362655U CN202220626008.9U CN202220626008U CN217362655U CN 217362655 U CN217362655 U CN 217362655U CN 202220626008 U CN202220626008 U CN 202220626008U CN 217362655 U CN217362655 U CN 217362655U
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Abstract
The invention discloses a power supply circuit with temporary power supply and charge-discharge control functions, which is arranged between a direct-current power supply and a load and comprises n capacitors, a current-limiting charge control circuit, a start monitoring circuit, a capacitor voltage monitoring circuit and n discharge diodes, wherein the n capacitors, the current-limiting charge control circuit and the n discharge diodes are respectively in one-to-one correspondence, and the number of the capacitor voltage monitoring circuits is n-1. The utility model can not only meet the use requirement of providing stable voltage for the load when the direct current power supply is powered down, but also avoid the problem that the capacitor can not be used as a temporary power supply in time because the large-capacity capacitor needs to be charged for a long time; the function of completing load starting and then starting charging can be realized by utilizing the starting monitoring circuit, and no matter how large the total capacity of the capacitors after parallel connection is, the capacitors cannot influence the impact current and the starting time during starting; the current-limiting charging control circuit is used for charging the capacitor, so that the current can be prevented from damaging the direct-current power supply or the capacitor.
Description
Technical Field
The utility model relates to a power supply circuit especially relates to a power supply circuit with interim power supply and charge-discharge control function.
Background
In some special fields, a power supply needs to have a temporary power supply function to avoid safety accidents, for example, in the aerospace field, during the flight of an aircraft, the power supply may be short of a period (for example, within hundreds of milliseconds) due to sudden start of some equipment or other accidents, or even the power supply is powered off, the flight safety is seriously threatened by the short-time power supply or the power off, and to solve the problem of the short-time power off, a circuit needs to be added at the power supply input end of a load to enable the load to have the temporary power supply function.
To solve the above problem, a capacitor is usually connected to the power output terminal or the power input terminal of the load (i.e. the electrical device), and in order to ensure that the capacitor can store enough electric energy to meet the temporary power supply requirement, a capacitor with a large capacity, such as several tens of thousands microfarads or more, is required. As long as the capacity of the capacitor is large enough, the energy released by the large-capacity capacitor can serve as a temporary power supply at the moment of power failure of the power supply, the problem of power failure or insufficient power supply of the power supply can be effectively solved, and the flight safety is ensured.
However, aviation equipment also has requirements on the starting current (i.e. impact current) and starting time, i.e. the starting time of the equipment cannot be too long, and the impact current cannot be too large. When the capacitance of the power supply is increased, the starting current is inevitably increased or the starting time is prolonged, and the flight safety can be influenced.
The conventional method for solving the above problems is: the problem of power failure of the equipment power supply is solved by increasing the capacity of the capacitor; by reducing the capacitance, the problems of starting current and starting time of the equipment are solved.
It can be seen that the above two solutions are contradictory, and some airplane equipment systems need to solve the problems of starting current, starting time and power failure at the same time, and obviously the above conventional methods cannot be used to meet the contradictory performance requirements. If the problem is not solved and serious potential safety hazard exists, the development of aviation industry is greatly influenced, so a new scheme which can simultaneously have temporary power supply and charge-discharge control functions is urgently needed to solve the problem at present.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a power supply circuit having temporary power supply and charge/discharge control functions in order to solve the above-mentioned problems.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
a power supply circuit with temporary power supply and charge-discharge control functions is arranged between a direct-current power supply and a load and comprises capacitors and current-limiting charge control circuits, wherein the positive output end and the negative output end of the direct-current power supply are respectively and correspondingly connected with the positive input end and the negative input end of the load, the power supply circuit with the temporary power supply and charge-discharge control functions further comprises a start monitoring circuit for monitoring the start voltage of the direct-current power supply, a capacitor voltage monitoring circuit for monitoring the capacitor voltage and a discharge diode for unidirectional conduction discharge, the capacitors, the current-limiting charge control circuits and the discharge diodes are respectively n and mutually in one-to-one correspondence, n is an integer larger than 2, the capacitor voltage monitoring circuits are n-1, and the power supply input end of each current-limiting charge control circuit, the negative electrode of each discharge diode and the positive input end of the start monitoring circuit are respectively and correspondingly connected with the direct-current power supply The power supply output end of each current-limiting charging control circuit is respectively connected with the anode of the corresponding capacitor and the anode of the corresponding discharging diode, the cathode of each capacitor, the cathode input end of each capacitor voltage monitoring circuit and the cathode input end of the starting monitoring circuit are respectively connected with the cathode output end of the direct current power supply, the anode of the first capacitor is connected with the anode input end of the first capacitor voltage monitoring circuit, the anode of the second capacitor is connected with the anode input end of the second capacitor voltage monitoring circuit, and so on, until the n-1 th capacitor is connected with the anode input end of the n-1 th capacitor voltage monitoring circuit, the signal output end of the starting monitoring circuit is connected with the control input end of the first current-limiting charging control circuit, the control output end of the first capacitor voltage monitoring circuit is connected with the control input end of the second current-limiting charging control circuit, the control output end of the second capacitor voltage monitoring circuit is connected with the control input end of the third current-limiting charging control circuit, and the like is carried out until the control output end of the (n-1) th capacitor voltage monitoring circuit is connected with the control input end of the nth current-limiting charging control circuit. The current-limiting charging control circuit adopts a conventional charging circuit, for example, a circuit disclosed in a utility model patent with the patent number of ZL202121698226.5 and the patent name of 'a current overshoot suppression circuit based on a negative feedback principle' can be adopted; the start monitoring circuit and the capacitor voltage monitoring circuit can adopt conventional monitoring circuits.
Preferably, in order to achieve a better monitoring function and facilitate implementation, the circuit structures of the start-up monitoring circuit and the capacitor voltage monitoring circuit are the same and are as follows: including first resistance, second resistance and operational amplifier, the first end of first resistance with the first end of second resistance with operational amplifier's negative pole input is connected, operational amplifier's positive input end is connected with reference voltage, the second end of first resistance is as corresponding start monitoring circuit or capacitance voltage monitoring circuit's positive input end, the second end of second resistance is as corresponding start monitoring circuit or capacitance voltage monitoring circuit's negative input end, operational amplifier's output is as corresponding start monitoring circuit or capacitance voltage monitoring circuit's signal output part.
Preferably, in order to prevent the reverse current flow, the output terminal of the operational amplifier is connected to the positive electrode of a reverse diode for preventing the reverse current flow, and the negative electrode of the reverse diode is used as the signal output terminal of the corresponding start-up monitoring circuit or the corresponding capacitor voltage monitoring circuit.
The beneficial effects of the utility model reside in that:
the utility model discloses an adopt a plurality of electric capacities less to connect in parallel and form the electric capacity of large capacity and utilize electric capacity voltage monitoring circuit to realize the function of carrying out quick charge to a plurality of small capacity electric capacities in proper order, can satisfy the user demand that provides steady voltage for the load when the direct current power supply falls, avoided again needing to charge the problem that the electric capacity can not in time be as temporary power supply to the large capacity electric capacity for a long time; the function of completing load starting and then starting charging can be realized by utilizing the starting monitoring circuit, and no matter how large the total capacity of the capacitors after parallel connection is, the capacitors cannot influence the impact current and the starting time during starting; the current-limiting charging control circuit is used for charging the capacitor, so that the current can be prevented from damaging the direct-current power supply or the capacitor.
Drawings
Fig. 1 is a schematic circuit diagram of a power supply circuit with temporary power supply and charge/discharge control functions according to the present invention;
fig. 2 is a circuit diagram of a start monitoring circuit and a capacitor voltage monitoring circuit of a power supply circuit with temporary power supply and charge-discharge control functions.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in FIG. 1, the power circuit with temporary power supply and charge-discharge control function is disposed between the DC power supply and the load, including a capacitor, a current-limiting charge control circuit, a start-up monitoring circuit for monitoring the start-up voltage of the DC power supply, a capacitor voltage monitoring circuit for monitoring the capacitor voltage and a discharge diode for unidirectional conduction discharge, the positive output terminal and the negative output terminal of the DC power supply are respectively connected with the positive input terminal and the negative input terminal of the load, the capacitor, the current-limiting charge control circuit and the discharge diode are respectively n and in one-to-one correspondence, i.e. the first capacitor C1, the first current-limiting charge control circuit and the first discharge diode D1 are in mutual correspondence, the second capacitor C2, the second current-limiting charge control circuit and the second discharge diode D2 are in mutual correspondence, and so on, the nth capacitor Cn, The nth current-limiting charging control circuit and the nth discharging diode Dn correspond to each other, n is an integer greater than 2, preferably 5 to 15, the capacitor voltage monitoring circuits are n-1, the power input end of each current-limiting charging control circuit, the cathode of each discharging diode and the anode input end of the starting monitoring circuit are respectively connected with the anode output end of the direct-current power supply, the power output end of each current-limiting charging control circuit is respectively connected with the anode of the corresponding capacitor and the anode of the corresponding discharging diode, the cathode of each capacitor, the cathode input end of each capacitor voltage monitoring circuit and the cathode input end of the starting monitoring circuit are respectively connected with the cathode output end of the direct-current power supply, the anode of the first capacitor C1 is connected with the anode input end of the first capacitor voltage monitoring circuit, the anode of the second capacitor C2 is connected with the anode input end of the second capacitor voltage monitoring circuit, and so on, until the (n-1) th capacitor is connected with the positive input end of the (n-1) th capacitor voltage monitoring circuit, the signal output end of the starting monitoring circuit is connected with the control input end of the first current-limiting charging control circuit, the control output end of the first capacitor voltage monitoring circuit is connected with the control input end of the second current-limiting charging control circuit, the control output end of the second capacitor voltage monitoring circuit is connected with the control input end of the third current-limiting charging control circuit, and so on, until the control output end of the (n-1) th capacitor voltage monitoring circuit is connected with the control input end of the nth current-limiting charging control circuit. The current-limiting charge control circuit adopts a circuit disclosed in the utility model patent with the patent number of ZL202121698226.5 and the patent name of 'a current overshoot suppression circuit based on the negative feedback principle'.
As shown in fig. 2, preferably, in order to achieve a better monitoring function and facilitate implementation, the circuit structures of the start-up monitoring circuit and the capacitor voltage monitoring circuit are the same and are as follows: the circuit comprises a first resistor R1, a second resistor R2 and an operational amplifier IC1, wherein the first end of the first resistor R1 is connected with the first end of the second resistor R2 and the negative input end of the operational amplifier IC1, the positive input end of the operational amplifier IC1 is connected with a reference voltage Vc, the second end of the first resistor R1 is used as the positive input end Vi + of the corresponding start-up monitoring circuit or the corresponding capacitor voltage monitoring circuit, the second end of the second resistor R2 is used as the negative input end Vi-of the corresponding start-up monitoring circuit or the corresponding capacitor voltage monitoring circuit, the output end of the operational amplifier IC1 is connected with the positive electrode of a reverse diode D0 for preventing current from reversely flowing, and the negative electrode of the reverse diode D0 is used as the signal output end Vo of the corresponding start-up monitoring circuit or the corresponding capacitor voltage monitoring circuit.
With reference to fig. 1 and fig. 2, the following description will be made of a preferred control method of a power supply circuit with temporary power supply and charge/discharge control functions, and the following control method can also be used to describe the working principle of the present invention, and this control method is not the object of the present invention, and this control method includes the following steps:
step 1, starting a direct-current power supply, enabling a load to be electrified and started, and enabling all current-limiting charging control circuits to be not operated, so that all capacitors are not charged, and the function of starting recharging firstly is realized;
step 2, after the direct current power supply is started, starting a monitoring circuit to detect the voltage value of the positive output end of the direct current power supply in real time, and when the voltage value reaches a preset starting charging threshold value, starting a signal output by the monitoring circuit to control a first current-limiting charging control circuit to work and start to charge a first capacitor C1, wherein the starting charging threshold value corresponds to the voltage value of the positive output end of the direct current power supply corresponding to the finished starting of the load;
step 3, the first capacitor voltage monitoring circuit detects the voltage value of the positive electrode of the first capacitor C1 in real time, and when the voltage value reaches a preset capacitor capacity threshold value, a signal output by the first capacitor voltage monitoring circuit controls the second current-limiting charging control circuit to work and start to charge the second capacitor C2, wherein the capacitor capacity threshold value is the voltage value of the positive electrode of the corresponding capacitor when the capacitor is fully charged;
step 4, replacing the last capacitor voltage monitoring circuit with the next capacitor voltage monitoring circuit, replacing the last current-limiting charging control circuit with the next current-limiting charging control circuit, repeating the step 3 until all the capacitors are charged, namely, finally, charging the nth capacitor Cn, so that the function of sequentially charging all the capacitors is realized, and the charging time of each capacitor is short and the charging speed is high;
and step 5, when the voltage of the positive output end of the direct current power supply is reduced or is directly zero, the positive voltages of all the capacitors are loaded on the positive input end of the load through the corresponding discharge diodes, and stable input voltage is automatically provided for the load, so that the function of providing a temporary power supply for the load through the discharge of each capacitor through an independent circuit is realized.
The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.
Claims (3)
1. The utility model provides a power supply circuit with interim power supply and charge-discharge control function, locates between DC power supply and the load, including electric capacity and current-limiting charge control circuit, DC power supply's positive output and negative output respectively with the positive input and the negative input of load correspond and are connected its characterized in that: the power supply circuit with the temporary power supply and charge-discharge control functions further comprises a start monitoring circuit for monitoring the start voltage of the direct-current power supply, a capacitor voltage monitoring circuit for monitoring the capacitor voltage and a discharge diode for unidirectional conduction discharge, the capacitors, the current-limiting charge control circuits and the discharge diodes are respectively in n one-to-one correspondence, n is an integer larger than 2, the number of the capacitor voltage monitoring circuits is n-1, the power supply input end of each current-limiting charge control circuit, the negative electrode of each discharge diode and the positive electrode input end of the start monitoring circuit are respectively connected with the positive electrode output end of the direct-current power supply, the power supply output end of each current-limiting charge control circuit is respectively connected with the positive electrode of the corresponding capacitor, the positive electrode of the corresponding discharge diode, the negative electrode of each capacitor, The negative input end of each capacitor voltage monitoring circuit and the negative input end of the starting monitoring circuit are respectively connected with the negative output end of the direct current power supply, the positive electrode of the first capacitor is connected with the positive input end of the first capacitor voltage monitoring circuit, the positive electrode of the second capacitor is connected with the positive input end of the second capacitor voltage monitoring circuit, and so on, until the (n-1) th capacitor is connected with the positive input end of the (n-1) th capacitor voltage monitoring circuit, the signal output end of the starting monitoring circuit is connected with the control input end of the first current-limiting charging control circuit, the control output end of the first capacitor voltage monitoring circuit is connected with the control input end of the second current-limiting charging control circuit, and the control output end of the second capacitor voltage monitoring circuit is connected with the control input end of the third current-limiting charging control circuit, and the like, until the control output end of the (n-1) th capacitor voltage monitoring circuit is connected with the control input end of the (n) th current-limiting charging control circuit.
2. The power supply circuit having temporary power supply and charge-discharge control functions as claimed in claim 1, wherein: the start monitoring circuit and the capacitor voltage monitoring circuit have the same circuit structure and the circuit structure is as follows: including first resistance, second resistance and operational amplifier, the first end of first resistance with the first end of second resistance with operational amplifier's negative pole input is connected, operational amplifier's positive input end is connected with reference voltage, the second end of first resistance is as corresponding start monitoring circuit or capacitance voltage monitoring circuit's positive input end, the second end of second resistance is as corresponding start monitoring circuit or capacitance voltage monitoring circuit's negative input end, operational amplifier's output is as corresponding start monitoring circuit or capacitance voltage monitoring circuit's signal output part.
3. The power supply circuit having the temporary power supply and charge-discharge control functions as claimed in claim 2, wherein: the output end of the operational amplifier is connected with the anode of a reverse diode for preventing current from reversely flowing, and the cathode of the reverse diode is used as the signal output end of the corresponding starting monitoring circuit or the corresponding capacitor voltage monitoring circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220626008.9U CN217362655U (en) | 2022-03-22 | 2022-03-22 | Power supply circuit with temporary power supply and charge-discharge control functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220626008.9U CN217362655U (en) | 2022-03-22 | 2022-03-22 | Power supply circuit with temporary power supply and charge-discharge control functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217362655U true CN217362655U (en) | 2022-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220626008.9U Active CN217362655U (en) | 2022-03-22 | 2022-03-22 | Power supply circuit with temporary power supply and charge-discharge control functions |
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| Country | Link |
|---|---|
| CN (1) | CN217362655U (en) |
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- 2022-03-22 CN CN202220626008.9U patent/CN217362655U/en active Active
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