Power-down holding circuit and power supply equipment

Abstract

The utility model provides a power-down holding circuit and a power supply device. The power-down holding circuit comprises an auxiliary power supply, a first isolation unit and an energy storage unit. The first end of the first isolation unit is connected with the positive output end of the auxiliary power supply, the second end of the first isolation unit is connected with the first end of the energy storage unit, and the second end of the energy storage unit is connected with the negative output end of the auxiliary power supply; the conduction direction of the first isolation unit is the direction from the first end of the first isolation unit to the second end of the first isolation unit; the first isolation unit is used for isolating the first type of load from the second type of load; the first end of the energy storage unit and the second end of the energy storage unit are also used for connecting a first type of load; the positive output end of the auxiliary power supply and the negative output end of the auxiliary power supply are also used for connecting a second-class load; wherein the first type of load is a load associated with the monitoring function, and the second type of load is a load irrelevant to the monitoring function. The power-down holding circuit provided by the utility model can reduce the occupied space and the cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power supply technical field especially relates to a power failure holding circuit and power supply equipment. BACKGROUND

[0002] Auxiliary power supply inside energy storage device, uninterruptible power supply, direct current power supply and the like are used for power supply for a plurality of loads. In related technologies, the plurality of loads are all powered by the same auxiliary power supply, such as shown in the figure, one auxiliary power supply simultaneously powers load 1 to load 5. In this way, when the auxiliary power supply fails, the plurality of loads will all be powered off, resulting in that the product loses the monitoring function at the same time of the failure, cannot collect the fault information, and transmits the fault information to the northbound device. Figure 1

[0003] In related technologies, an electrolytic capacitor is usually added at the output end of the auxiliary power supply, so that even if the auxiliary power supply is powered off, power supply can be maintained for a certain time, but due to the fact that the power of part of the loads is large, the capacitance value of the required electrolytic capacitor is large, a large space needs to be occupied, and the cost is high. SUMMARY

[0004] Therefore, the utility model embodiment provides a power failure holding circuit and power supply equipment to solve the problem that the electrolytic capacitor is added at the output end of the auxiliary power supply at present, a large space is occupied, and the cost is high.

[0005] The utility model embodiment provides a power failure holding circuit in a first aspect, including auxiliary power supply, first isolation unit and energy storage unit;

[0006] The first end of the first isolation unit is connected with the positive output end of the auxiliary power supply, the second end of the first isolation unit is connected with the first end of the energy storage unit, and the second end of the energy storage unit is connected with the negative output end of the auxiliary power supply; The conduction direction of the first isolation unit is the direction from the first end of the first isolation unit to the second end of the first isolation unit; The first isolation unit is used for isolating the first type load and the second type load;

[0007] The first end of the energy storage unit and the second end of the energy storage unit are also used for connecting the first type load; The positive output end of the auxiliary power supply and the negative output end of the auxiliary power supply are also used for connecting the second type load;

[0008] Among them, the first type load is the load associated with the monitoring function, and the second type load is the load irrelevant to the monitoring function.

[0009] In some possible implementation manners, the first type load includes a main control circuit, a sampling circuit, a communication circuit, and a secondary power supply circuit matched with the main control circuit, the sampling circuit and the communication circuit.

[0010] ​In some possible implementation manners, the second type of load includes a fan circuit, a driving circuit, a relay circuit, and a primary power supply circuit and a secondary power supply circuit matched with the fan circuit, the driving circuit and the relay circuit.

[0011] In some possible implementation manners, the first isolation unit includes a first diode.

[0012] The anode of the first diode is used as the first end of the first isolation unit, and the cathode of the first diode is used as the second end of the first isolation unit.

[0013] In some possible implementation manners, the first isolation unit includes a first switch tube and a first control circuit.

[0014] The first end of the first switch tube is used as the first end of the first isolation unit, the second end of the first switch tube is used as the second end of the first isolation unit, and the control end of the first switch tube is connected with the first control circuit.

[0015] The first switch tube is turned off when the auxiliary power supply is powered off, and the first switch tube is turned on when the auxiliary power supply is not powered off.

[0016] In some possible implementation manners, the energy storage unit includes a capacitor.

[0017] The first end of the capacitor is used as the first end of the energy storage unit, and the second end of the capacitor is used as the second end of the energy storage unit.

[0018] In some possible implementation manners, the capacitance C of the capacitor satisfies C=Ixt / △U.

[0019] Wherein, I is the current required for the first type of load to maintain a working state, t is the time length required for the first type of load to maintain a working state after the auxiliary power supply is powered off, and △U is the voltage drop required for the first type of load to maintain a working state after the auxiliary power supply is powered off.

[0020] In some possible implementation manners, the input end of the auxiliary power supply is used for connecting a busbar.

[0021] In some possible implementation manners, the power-off maintaining circuit further includes a second isolation unit.

[0022] The first end of the second isolation unit is connected with the positive output end of the auxiliary power supply, and the second end of the second isolation unit is connected with the first end of the first isolation unit.

[0023] The second end of the second isolation unit and the negative output end of the auxiliary power supply are further used for connecting the second type of load.

[0024] The utility model embodiment second aspect provides a kind of power supply equipment, including as described in the power-off maintaining circuit of first aspect or any possible implementation manner of first aspect.

[0025] The power-off holding circuit provided by the embodiment comprises an auxiliary power supply, a first isolation unit and an energy storage unit; the first type of load and the second type of load can be isolated by the first isolation unit, that is, the load associated with the monitoring function and the load irrelevant to the monitoring function are isolated, and the energy storage unit is arranged on the side where the first type of load is located, the second type of load is arranged on the other side of the first isolation unit, and the conduction direction of the first isolation unit is the direction from the first end of the first isolation unit to the second end of the first isolation unit, so that when the auxiliary power supply works normally, the auxiliary power supply can supply power to the first type of load and the second type of load, and charge the energy storage unit at the same time, when the auxiliary power supply fails, the energy storage unit can only supply power to the first type of load, and the first type of load is associated with the monitoring function, and the required power is small, therefore, the energy storage unit does not need to be too large in capacity to achieve a certain power-off holding time, and the occupied space and cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is a structure diagram of the auxiliary power supply and the load connected in the related art;

[0028] Figure 2 is a structure diagram of the power-off holding circuit provided by the embodiment of the present application Figure 1 .

[0029] Figure 3 is a structure diagram of the power-off holding circuit provided by the embodiment of the present application Figure 2 .

[0030] Figure 4 is a structure diagram of the power-off holding circuit provided by the embodiment of the present application Figure 3 .

[0031] Figure 5 is a structure diagram of the power-off holding circuit provided by the embodiment of the present application Figure 4 . DETAILED DESCRIPTION

[0032] In the following description, for the purpose of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0033] In order to illustrate the technical scheme of the present application, the following will be described through specific embodiments.

[0034] Referring to Figure 2 The embodiment of the present application provides a power-off holding circuit, which comprises an auxiliary power supply 21, a first isolation unit 22 and an energy storage unit 23.

[0035] The first end of the first isolation unit 22 is connected with the positive output end of the auxiliary power supply 21, the second end of the first isolation unit 22 is connected with the first end of the energy storage unit 23, and the second end of the energy storage unit 23 is connected with the negative output end of the auxiliary power supply 21; the conduction direction of the first isolation unit 22 is the direction from the first end of the first isolation unit 22 to the second end of the first isolation unit 22; the first isolation unit 22 is used for isolating the first type of load 24 and the second type of load 25.

[0036] The first end of the energy storage unit 23 and the second end of the energy storage unit 23 are also used for connecting the first type of load 24; the positive output end of the auxiliary power supply 21 and the negative output end of the auxiliary power supply 21 are also used for connecting the second type of load 25.

[0037] Among them, the first type of load 24 is a load associated with a monitoring function, and the second type of load 25 is a load not associated with the monitoring function.

[0038] In the embodiment of the present application, the load is divided into two types, one type is the first type of load 24 associated with the monitoring function, and the other type is the second type of load 25 not associated with the monitoring function. The monitoring function refers to the real-time monitoring of the working state of the auxiliary power supply 21 in the power-off holding circuit. When the auxiliary power supply 21 fails, the monitoring function needs to continue to work for a period of time, so as to send the fault information of the auxiliary power supply 21 to the northbound device.

[0039] Therefore, the power-off holding circuit in the embodiments of the present application comprises a first isolation unit 22. The first isolation unit 22 can be unidirectionally conductive, and the conductive direction is from the first end of the first isolation unit 22 to the second end of the first isolation unit 22, that is, the current output by the positive output end of the auxiliary power supply 21 can flow through the first end of the first isolation unit 22 and the second end of the first isolation unit 22 in turn, but cannot flow in the reverse direction. The first isolation unit 22 electrically isolates the first type of load 24 associated with the monitoring function and the second type of load 25 irrelevant to the monitoring function, and increases the energy storage unit 23 in front of the first type of load 24. The first isolation unit 22 also electrically isolates the second type of load 25 from the energy storage unit 23, and the current output by the energy storage unit 23 cannot flow to the second type of load 25 through the first isolation unit 22.

[0040] When the auxiliary power supply 21 is working normally, the auxiliary power supply 21 can supply power to the first type of load 24 and the second type of load 25, and can also charge the energy storage unit 23. When the auxiliary power supply 21 fails to continue to supply power, the voltage output by the auxiliary power supply 21 rapidly decreases to 0 under the action of the second type of load 25, and due to the isolation of the first isolation unit 22, the energy storage unit 23 can only supply power to the first type of load 24, that is, only to the load associated with the monitoring function, and the second type of load 25 irrelevant to the monitoring function will not consume the power of the energy storage unit 23. In the same time, the first capacity of the energy storage unit required to maintain the operation of the first type of load 24 is smaller than the second capacity of the energy storage unit required to maintain the simultaneous operation of the first type of load 24 and the second type of load 25, and the first capacity can be several tenths of the second capacity.

[0041] Referring to Figure 2 The first type of load 24 can be connected in parallel with the energy storage unit 23, if there are multiple first type of loads 24, the multiple first type of loads 24 are all connected in parallel with the energy storage unit 23, and the first type of load 24 and the energy storage unit 23 are located on the same side of the first isolation unit 22. The second type of load 25 is located on the other side of the first isolation unit 22, that is, the second type of load 25 is located on the two sides of the first isolation unit 22 with the first type of load 24. The second type of load 25 is connected between the positive output end of the auxiliary power supply 21 and the negative output end of the auxiliary power supply 21, if there are multiple second type of loads 25, the multiple second type of loads 25 are connected in parallel between the positive output end of the auxiliary power supply 21 and the negative output end of the auxiliary power supply 21.

[0042] The power-off holding circuit provided by the embodiments of the present application comprises an auxiliary power supply 21, a first isolation unit 22 and an energy storage unit 23. The first isolation unit 22 can isolate the first type of load 24 and the second type of load 25, i.e. isolates the load associated with the monitoring function and the load irrelevant to the monitoring function, and the energy storage unit 23 is arranged on the side where the first type of load 24 is located, the second type of load 25 is arranged on the other side of the first isolation unit 22, and the conduction direction of the first isolation unit 22 is the direction from the first end of the first isolation unit 22 to the second end of the first isolation unit 22. Thus, when the auxiliary power supply 21 is working normally, the auxiliary power supply 21 can supply power to the first type of load 24 and the second type of load 25, and at the same time, charge the energy storage unit 23. When the auxiliary power supply 21 fails, the energy storage unit 23 can only supply power to the first type of load 24. The first type of load 24 is associated with the monitoring function, and the power required for supplying power to the first type of load 24 is less than the power required for supplying power to the first type of load 24 and the second type of load 25 at the same time. Therefore, the energy storage unit 23 does not need to have too large capacity to achieve a certain power-off holding time, so that the monitoring function can monitor the failure information of the auxiliary power supply 21 and send it to the northward device, and at the same time, the occupied space and cost can be reduced, the selection of the energy storage unit 23 is facilitated, and the usability of the power-off holding circuit can be improved.

[0043] In some embodiments, the first type of load 24 comprises a master control circuit, a sampling circuit, a communication circuit, and a secondary power supply circuit matched with the master control circuit, the sampling circuit and the communication circuit.

[0044] The master control circuit, the sampling circuit, the communication circuit and the secondary power supply circuit matched with the master control circuit, the sampling circuit and the communication circuit are all mature circuits in related technologies, and will not be described here.

[0045] For example, the sampling circuit and the communication circuit can both be connected with the master control circuit, and the communication circuit can also be connected with the northward device. The sampling circuit is used to collect real-time parameter data of the auxiliary power supply 21 and send the collected data to the master control circuit. For example, the real-time current and voltage data of the auxiliary power supply 21 can be collected. The master control circuit transmits the data sent by the sampling circuit to the northward device through the communication circuit, or the master control circuit can process the data sent by the sampling circuit and then transmit the processed data to the northward device through the communication circuit, etc.

[0046] When the auxiliary power supply 21 fails, the first type of load 24 can still work for a period of time through the power supply of the energy storage unit 23. During this period of time, the collected data is sent to the northward device, and the northward device can analyze the collected data during this period of time as failure information to determine the failure type of the auxiliary power supply 21, etc.

[0047] In some embodiments, the second type of load 25 includes a fan circuit, a driving circuit, a relay circuit, and a primary power supply circuit and a secondary power supply circuit matched with the fan circuit, the driving circuit, and the relay circuit.

[0048] The fan circuit can be used to control the working state of a device such as a fan, so as to achieve functions such as heat dissipation, ventilation, and temperature control.

[0049] The driving circuit can be used to drive a corresponding execution element to work or run. The execution element can include one or more of an inverter, a charger, a relay, and a motor.

[0050] The relay circuit can be used for switching control, electrical isolation, and the like.

[0051] The fan circuit, the driving circuit, the relay circuit, and the primary power supply circuit and the secondary power supply circuit matched with the fan circuit, the driving circuit, and the relay circuit are mature circuits in the related art, and will not be described here.

[0052] It should be noted that, in addition to the above-mentioned fan circuit, driving circuit, relay circuit, and primary power supply circuit and secondary power supply circuit matched with the fan circuit, driving circuit, and relay circuit, the second type of load 25 can also include other required circuit loads, which are not specifically limited here.

[0053] In some embodiments, referring to Figure 3 , the first isolation unit 22 includes a first diode D1.

[0054] The anode of the first diode D1 is the first end of the first isolation unit 22, and the cathode of the first diode D1 is the second end of the first isolation unit 22.

[0055] The first diode D1 is unidirectionally conductive, and the conduction direction of the first diode D1 is the same as the conduction direction of the first isolation unit 22.

[0056] In some embodiments, the first isolation unit 22 includes a first switch tube and a first control circuit.

[0057] The first end of the first switch tube is the first end of the first isolation unit 22, the second end of the first switch tube is the second end of the first isolation unit 22, and the control end of the first switch tube is connected with the first control circuit.

[0058] When the auxiliary power supply 21 is powered off, the first switch tube is turned off; when the auxiliary power supply 21 is not powered off, the first switch tube is turned on.

[0059] In the embodiments of the present application, the first switch tube is controlled by the first control circuit. The first control circuit can control the first switch tube to be turned off when it is detected that the auxiliary power supply 21 is powered off, and control the first switch tube to be turned on when it is detected that the auxiliary power supply 21 is not powered off.

[0060] It should be noted that, in addition to the above two implementation manners, the first isolation unit 22 can also have other implementation manners, which are not specifically limited here.

[0061] In some embodiments, referring to Figure 3 The energy storage unit 23 includes a capacitor C1.

[0062] The first end of the capacitor C1 is the first end of the energy storage unit 23, and the second end of the capacitor C1 is the second end of the energy storage unit 23.

[0063] The embodiments of the present application can use the capacitor C1 as the energy storage unit 23, and specifically can use an electrolytic capacitor as the energy storage unit 23. When the auxiliary power supply 21 is working normally, the capacitor C1 can be charged, and when the auxiliary power supply 21 fails, the capacitor C1 can be discharged to supply power to the first type of load 24.

[0064] The energy storage unit 23 can also have other implementation manners. For example, the energy storage unit 23 can include a battery; the positive electrode of the battery is the first end of the energy storage unit 23, and the negative electrode of the battery is the second end of the energy storage unit 23. When the auxiliary power supply 21 is working normally, the battery can be charged, and when the auxiliary power supply 21 fails, the battery can be discharged to supply power to the first type of load 24.

[0065] In some embodiments, the capacitance C of the capacitor C1 satisfies C = I × t / △U.

[0066] Wherein, I is the current required for the first type of load 24 to maintain a working state; t is the time length required for the first type of load 24 to maintain a working state after the auxiliary power supply 21 is powered off; and △U is the voltage drop required for the first type of load 24 to maintain a working state after the auxiliary power supply 21 is powered off.

[0067] The current required for the first type of load 24 to maintain a working state refers to the total current required for all first type of loads 24 to maintain a working state.

[0068] The time length required for the first type of load 24 to maintain a working state after the auxiliary power supply 21 is powered off is the time length required for the first type of load 24 to maintain a powered-on state after the auxiliary power supply 21 fails to supply power (i.e., the time length required for the first type of load 24 to complete the function of recording fault information).

[0069] The voltage drop required for the first type of load 24 to maintain the working state after the auxiliary power supply 21 is powered off is the voltage drop required for the first type of load 24 to maintain the powered-on state after the auxiliary power supply 21 fails to supply power.

[0070] Exemplarily, when the first type of load 24 includes the master control circuit, the sampling circuit, the communication circuit, and the secondary power supply circuit matched with the master control circuit, the sampling circuit, and the communication circuit, I is the total current required for the master control circuit, the sampling circuit, the communication circuit, and the secondary power supply circuit matched with the master control circuit, the sampling circuit, and the communication circuit to maintain the working state; t is the time length required for the master control circuit, the sampling circuit, the communication circuit, and the secondary power supply circuit matched with the master control circuit, the sampling circuit, and the communication circuit to maintain the powered-on state after the auxiliary power supply 21 is powered off; and △U is the voltage drop required for the master control circuit, the sampling circuit, the communication circuit, and the secondary power supply circuit matched with the master control circuit, the sampling circuit, and the communication circuit to maintain the working state after the auxiliary power supply 21 is powered off. The capacitance of the capacitor C1 included in the energy storage unit 23 is determined according to the three parameters.

[0071] In some embodiments, the input end of the auxiliary power supply 21 is used to connect the busbar.

[0072] The busbar can be connected to the AC power supply through the AC-DC conversion module.

[0073] In another embodiment, the auxiliary power supply 21 can be directly connected to the AC power supply through the AC-DC conversion module.

[0074] The auxiliary power supply 21 can be a secondary power supply, which obtains power from a primary power supply; or the auxiliary power supply 21 can be a primary power supply, which obtains power through input rectification conversion.

[0075] In some embodiments, referring to Figure 4 , the power-off maintaining circuit further includes a second isolation unit 26;

[0076] The first end of the second isolation unit 26 is connected to the positive output end of the auxiliary power supply 21, and the second end of the second isolation unit 26 is connected to the first end of the first isolation unit 22.

[0077] The second end of the second isolation unit 26 and the negative output end of the auxiliary power supply 21 are further used to connect the second type of load 25.

[0078] The second isolation unit 26 is unidirectionally conductive, and the conduction direction is from the first end of the second isolation unit 26 to the second end of the second isolation unit 26, which is the same as the conduction direction of the first isolation unit 22.

[0079] In the embodiments of the present application, the second isolation unit 26 can be added between the output end of the auxiliary power supply 21 and the second type of load 25 to prevent the reverse of the current.

[0080] Referring to Figure 5 , the second isolation unit 26 can include a second diode D2; the positive electrode of the second diode D2 is the first end of the second isolation unit 26, and the negative electrode of the second diode D2 is the second end of the second isolation unit 26.

[0081] It should be noted that the above-mentioned second isolation unit 26 can have other embodiments in addition to the above-mentioned embodiments, and can refer to the related description of the aforementioned first isolation unit 22, which is not specifically limited here.

[0082] Corresponding to the above power-off holding circuit, the utility model embodiment provides a kind of power supply equipment, including as above any kind of power-off holding circuit, and with as above any kind of power-off holding circuit Beneficial effect.

[0083] The detailed description of the power supply equipment is described in the foregoing power-off holding circuit, which will not be repeated here.

[0084] The above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model, and should be included in the protection scope of the utility model.

Claims

1. A power-down retention circuit, characterized in that, Includes auxiliary power supply, first isolation unit and energy storage unit; The first end of the first isolation unit is connected to the positive output terminal of the auxiliary power supply, the second end of the first isolation unit is connected to the first end of the energy storage unit, and the second end of the energy storage unit is connected to the negative output terminal of the auxiliary power supply; the conduction direction of the first isolation unit is from the first end of the first isolation unit to the second end of the first isolation unit; the first isolation unit is used to isolate the first type of load and the second type of load. The first end and the second end of the energy storage unit are also used to connect to the first type of load; the positive output end and the negative output end of the auxiliary power supply are also used to connect to the second type of load. The first type of load is the load associated with the monitoring function, and the second type of load is the load unrelated to the monitoring function.

2. The power-down retention circuit according to claim 1, characterized in that, The first type of load includes a main control circuit, a sampling circuit, a communication circuit, and a secondary power supply circuit that is compatible with the main control circuit, the sampling circuit, and the communication circuit.

3. The power-down retention circuit according to claim 1, characterized in that, The second type of load includes a fan circuit, a drive circuit, a relay circuit, and a primary power supply circuit and a secondary power supply circuit that are compatible with the fan circuit, the drive circuit and the relay circuit.

4. The power-down retention circuit according to claim 1, characterized in that, The first isolation unit includes a first diode; The positive terminal of the first diode serves as the first end of the first isolation unit, and the negative terminal of the first diode serves as the second end of the first isolation unit.

5. The power-down retention circuit according to claim 1, characterized in that, The first isolation unit includes a first switching transistor and a first control circuit; The first end of the first switching transistor serves as the first end of the first isolation unit, the second end of the first switching transistor serves as the second end of the first isolation unit, and the control end of the first switching transistor is connected to the first control circuit. When the auxiliary power supply is de-energized, the first switch is turned off; when the auxiliary power supply is not de-energized, the first switch is turned on.

6. The power-down retention circuit according to claim 1, characterized in that, The energy storage unit includes a capacitor; The first end of the capacitor serves as the first end of the energy storage unit, and the second end of the capacitor serves as the second end of the energy storage unit.

7. The power-down retention circuit according to claim 6, characterized in that, The capacitance value C of the capacitor satisfies: C=I×t / △U; Where I is the current required for the first type of load to maintain its working state; t is the duration for which the first type of load needs to maintain its working state after the auxiliary power supply fails; and ΔU is the voltage drop required for the first type of load to maintain its working state after the auxiliary power supply fails.

8. The power-down retention circuit according to any one of claims 1 to 7, characterized in that, The input terminal of the auxiliary power supply is used to connect to the busbar.

9. The power-down retention circuit according to any one of claims 1 to 7, characterized in that, The power-down retention circuit also includes a second isolation unit; The first end of the second isolation unit is connected to the positive output terminal of the auxiliary power supply, and the second end of the second isolation unit is connected to the first end of the first isolation unit. The second terminal of the second isolation unit and the negative output terminal of the auxiliary power supply are also used to connect the second type of load.

10. A power supply device, characterized in that, Includes the power-off retention circuit as described in any one of claims 1 to 9.

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