CN209948780U - Commercial power storage battery seamless switching circuit and cash register - Google Patents
Commercial power storage battery seamless switching circuit and cash register Download PDFInfo
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- CN209948780U CN209948780U CN201920827258.7U CN201920827258U CN209948780U CN 209948780 U CN209948780 U CN 209948780U CN 201920827258 U CN201920827258 U CN 201920827258U CN 209948780 U CN209948780 U CN 209948780U
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Abstract
The utility model provides a seamless switching circuit of a commercial power storage battery, which mainly comprises a first diode unit and a charging and discharging unit which are arranged between the commercial power and the load, and a second diode unit which is arranged between the storage battery and the load; when the mains supply supplies power, the voltage value of the output end of the second diode unit is larger than that of the input end of the second diode unit; when the mains supply is powered off, the voltage value of the output end of the second diode unit is smaller than that of the input end of the second diode unit. The circuit can realize the preferential output of the commercial power and the seamless automatic switching between the commercial power supply and the storage battery power supply; in addition, the circuit saves a mechanical change-over switch, has low cost and has wide application prospect in equipment such as cash registers and the like; the utility model discloses owing to contained foretell seamless switching circuit and have longer life in the cash register that further provides, and with low costs, be favorable to carrying out marketing.
Description
Technical Field
The utility model relates to an uninterrupted power source technical field, more specifically say, relate to a commercial power battery seamless switching circuit and contain cash register of this circuit.
Background
In the existing uninterruptible power supply system, after the mains supply is powered off, the switching time for the storage battery to be accessed is too long, so that the power failure of equipment, the interruption or the crash of an operating system are caused, and if the user operation is not completed at the moment of the mains supply power failure, the input data information is lost, so that inconvenience is brought to the user.
SUMMERY OF THE UTILITY MODEL
The utility model provides a can supply seamless switching circuit of commercial power battery to because of after the commercial power outage among the solution prior art, battery switch-over access time overlength causes equipment outage, operating system to break off or die, and harm equipment just has the problem of losing data information.
In order to solve the technical problem, the utility model provides a seamless switching circuit of commercial power battery is provided to the first aspect, seamless switching circuit includes:
the commercial power input end is coupled with commercial power and outputs first direct current after rectification and voltage stabilization;
a power supply output coupled to a load;
a power supply node coupled to the power supply output;
the input end of the first diode unit is coupled with the mains supply input end, and the first diode unit is in forward conduction when the voltage value of the input end of the first diode unit is greater than the voltage value of the power supply node; the reverse cut-off is carried out when the voltage value of the input end of the reverse cut-off is smaller than the voltage value of the power supply node;
the charging and discharging unit is coupled with the mains input end, executes the operation of a charging mode when the mains input end has first direct current output, executes the operation of a discharging mode when the mains input end has no first direct current output, and outputs direct current to the power supply node through the first diode unit;
an electrical storage input coupled to the battery, the electrical storage input outputting a second direct current;
a second diode unit having an input coupled to the storage input, the second diode unit being turned off in the reverse direction when the voltage value at its input is less than the voltage value at the supply node; when the voltage value of the input end of the power storage input end is larger than the voltage value of the power supply node, the power storage input end is conducted in the forward direction, and second direct current output by the power storage input end flows to the power supply node through the second diode unit;
when the mains supply is powered, the voltage value at the power supply node is larger than the voltage value at the input end of the second diode unit; when the mains supply is powered off, the voltage value at the power supply node is smaller than the voltage value at the input end of the second diode unit.
Preferably, the first diode unit comprises at least one diode, an anode of the diode is connected with the mains supply input end, and a cathode of the diode is connected with the power supply node.
Preferably, the second diode unit comprises at least one diode, and the anode of the diode is connected with the power storage input end, and the cathode of the diode is connected with the power supply node.
More preferably, the diodes are all schottky diodes.
More preferably, the first diode unit includes two parallel schottky diodes, and the second diode unit includes three parallel schottky diodes.
Preferably, the charge and discharge unit includes at least one capacitor.
More preferably, the charging and discharging unit comprises an electrolytic capacitor and three ceramic chip capacitors.
Preferably, the seamless switching circuit further comprises: the voltage reduction chip is coupled with the power supply node at the input end and coupled with the power supply output end at the output end, and reduces the voltage value of the direct current output from the power supply node to the power supply voltage value required by the load.
Preferably, the seamless switching circuit further comprises an MOS transistor unit connected in parallel with the second diode unit, and the MOS transistor unit includes at least one P-channel MOS transistor.
In order to further solve the above technical problem, a second aspect of the present invention provides a cash register, which includes the above seamless switching circuit for the commercial power storage battery.
Compared with the prior art, the utility model provides a commercial power battery seamless switching circuit, through at load and commercial power, the diode unit of different specifications increases respectively on the circuit between load and the battery, and increase the charge-discharge unit in the circuit, utilize the switch function of diode unit and the charge-discharge function of charge-discharge unit to realize that the commercial power is given priority to be exported, and the seamless automatic switch-over of commercial power supply and battery power supply, avoided because commercial power cuts off the power supply suddenly, the battery switches over the access time overlength, cause the load outage, operating system interrupt or crash, the problem that the user loses data information; in addition, compared with the existing uninterrupted power supply system, the seamless switching circuit saves a mechanical switch, is low in cost and has wide application prospect in equipment such as cash registers and the like. The utility model discloses owing to contained foretell seamless switching circuit and have longer life in the cash register that further provides, and with low costs, be favorable to carrying out marketing.
Drawings
Fig. 1 is a block diagram of a seamless switching circuit for a commercial power storage battery according to an embodiment of the present invention.
Fig. 2 is a block diagram of a seamless switching circuit for a commercial power storage battery according to an embodiment of the present invention.
Fig. 3 is a block diagram of a seamless switching circuit for a commercial power storage battery according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a seamless switching circuit for a commercial power storage battery according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides a can provide the seamless switching of commercial power battery, can not cause the low-cost design circuit of load outage, operating system interrupt or crash, please refer to fig. 1 and show, this circuit includes: the system comprises a mains supply input end, a power supply output end, a power supply node, a first diode unit, a charge and discharge unit, an electric storage input end and a second diode unit, wherein the mains supply input end is electrically coupled with a mains supply, the power supply output end is coupled with a load, the power supply node is coupled with the power supply output end, the first diode unit is coupled with the mains supply input end, the charge and discharge unit is coupled with the mains supply input end, the input end is coupled with. The mains supply input end outputs a first direct current after rectification and voltage stabilization, and the first direct current can be used for charging the charging and discharging unit, charging the storage battery (in the prior art, not shown in the figure) and supplying power to a load at the same time; the first diode unit is in forward conduction when the voltage value of the input end of the first diode unit is larger than the voltage value of the power supply node, and is in reverse cutoff when the voltage value of the input end of the first diode unit is smaller than the voltage value of the power supply node; the charging and discharging unit executes the operation of the charging mode when the first direct current output exists at the mains supply input end, executes the operation of the discharging mode when the first direct current output does not exist at the mains supply input end, namely when the mains supply is powered off, and outputs the direct current to the power supply output end through the first diode unit and the power supply node in sequence and then to the load to supply power for the load. Further, the power storage input end outputs a second direct current, and the second direct current is only used for supplying power to the load after the mains supply is powered off; the second diode unit is reversely cut off when the voltage value of the input end of the second diode unit is smaller than the voltage value of the power supply node; when the voltage value of the input end of the power storage device is larger than the voltage value of the power supply node, the power storage device is conducted in the forward direction, and then second direct current output by the power storage input end sequentially passes through the second diode unit and the power supply node to the power supply output end and then to the load to supply power to the load.
According to the seamless switching circuit of the mains supply storage battery, the diode units with different specifications are respectively added on the circuit between the load and the mains supply and the circuit between the load and the storage battery, and the charging and discharging unit is added in the circuit, so that seamless automatic switching between mains supply and storage battery supply is realized by using the switching function of the diode units and the charging and discharging function of the charging and discharging unit, and the problems of load power failure, operating system interruption or crash and data information loss of users caused by sudden power failure of the mains supply and overlong switching-in time of the storage battery are avoided.
Further, the working principle of the seamless switching circuit of the mains supply storage battery is as follows:
when the mains supply supplies power, the mains supply output end outputs a first direct-current voltage, and the voltage value of the first direct-current voltage can meet the conditions of simultaneously charging the charging and discharging unit, charging the storage battery (in the prior art, not much described in the application) and supplying power to the load; furthermore, in order to enable the switching circuit to meet the principle of mains supply priority, the voltage value of the first direct current voltage is also required to be larger than the voltage value of the input end of the second diode unit when the mains supply is carried out, so that the second diode unit is always in a reverse cut-off state, namely, the storage battery is in an undischarged state, and the loss of the storage battery caused by long-term use of the storage battery is avoided.
When the mains supply is powered off, the charging and discharging unit starts to discharge to provide certain buffer time for the cut-in circuit of the storage battery, and direct current is output to a power supply node through the first diode unit to supply power to a load; in the utility model, assuming that the output voltage of the battery is V1, the supply voltage required by the load is V2, the discharge voltage of the charge and discharge unit is V3, the on-state voltage of the first diode unit is V4, and the on-state voltage of the second diode unit is V5, in order to provide a certain buffer time, the voltage values need to satisfy the following conditions: (1) the discharging time length required for the voltage of the charging and discharging unit to drop from V3 to (V2+ V4) is longer than the time required for the forward conduction of the second diode unit; (2) the following are satisfied when the charge and discharge unit starts discharging: v2< (V3-V4) < V1, that is, when the charging and discharging unit starts to discharge, the voltage value (V3-V4) at the power supply node is smaller than the voltage value V1 at the input end of the second diode unit, so that the second diode unit is conducted in the forward direction, but the voltage value (V3-V4) at the power supply node can meet the power supply voltage V2 required by the load. Because the time length required by the forward conduction of the second diode unit is less than the discharge time length of the charge-discharge unit, the charge-discharge unit still supplies power to the load during the time of the forward conduction of the second diode unit, and the load is not powered off; when the second diode unit finishes forward conduction, the voltage value at the power supply node is larger than the voltage value at the input end of the first diode unit, the first diode unit is cut off in the reverse direction at the moment, namely, the successful switching to the storage battery to be a load power supply stage at the moment is indicated, namely, the seamless automatic switching between the mains supply and the storage battery supply is realized by arranging the charging and discharging unit and the two diode units, and the problems of load power failure, operation system interruption or crash and data information loss of a user due to sudden power failure of the mains supply and overlong switching-in time of the storage battery are solved.
Further, in order to expand the application range of the circuit or provide sufficient buffering time to meet the system time error caused by the components with different parameters, the required discharging time of the voltage of the charging and discharging unit is much longer than the forward conducting time of the second diode unit when the voltage drops from V3 to (V2+ V4), for example, a diode with high forward conducting speed is selected as the diode unit of the present invention, in some embodiments of the present invention, the first diode unit and the second diode unit both include at least one diode, wherein the anode of the diode in the first diode unit is connected to the utility power input end, and the cathode is connected to the power supply node; and the anode of the diode in the second diode unit is connected with the power storage input end, and the cathode of the diode is connected with the power supply node. In some preferred embodiments, select the schottky diode as the utility model discloses in the diode that uses, it only needs tens of nanoseconds to switch on required length in the forward direction, several nanoseconds even, is less than the buffer time that the charge-discharge unit provided far away, consequently can satisfy completely the utility model discloses in required seamless switching requirement. The number of the diodes can be increased or reduced according to application scenes so as to fully utilize the switching function and the function of reducing circuit voltage drop of the diodes, and the seamless switching circuit utilizes the switching function of the diodes, so that a mechanical switch is saved, and compared with the conventional uninterrupted power supply system, the seamless switching circuit has low cost and is favorable for market popularization.
According to other embodiments of the present invention, the charging and discharging unit in the seamless switching circuit comprises at least one electrolytic capacitor and at least one ceramic capacitor, and these capacitors have not only charging and discharging functions but also filtering functions, wherein the requirements for the charging and discharging capabilities thereof need to satisfy the two conditions provided when the above-mentioned operation principle is introduced; further, in other embodiments of the present invention, the charging and discharging unit comprises an electrolytic capacitor and three ceramic capacitors, and the four capacitors are connected in parallel.
Referring to fig. 2, based on the embodiment of fig. 1, in other embodiments, the seamless switching circuit further includes a buck chip disposed between the power supply node and the power supply output terminal, where the buck chip reduces a voltage value of the dc power output from the power supply node to a power supply voltage value required by the load.
Referring to fig. 3, based on the embodiment of fig. 1, in other embodiments, the seamless switching circuit further includes a MOS transistor unit connected in parallel with the second diode unit, and the MOS transistor unit is used to reduce the voltage drop of the battery during the battery power supply phase, so as to reduce the temperature of the battery circuit. According to some embodiments of the present invention, the MOS transistor unit comprises at least one P-channel MOS transistor, and the P-channel MOS transistor is connected in parallel to the diode in the second diode unit.
The above-mentioned seamless switching circuit is especially suitable for low-power loads, such as cash register devices that have already been connected to a standby battery, please refer to fig. 4, which shows the schematic diagram of the seamless switching circuit for the commercial power storage battery provided by the present invention, and the specific structure and the working principle are as follows:
the seamless switching circuit comprises a commercial power supply circuit 1, a storage battery supply circuit 2, a DC/DC voltage reduction chip 3 and a host 4 (corresponding to the host in the load introduced above, more specifically, a cash dispenser); the commercial power (15V-18V) supply circuit 1 mainly includes: schottky diodes D38 and D5, electrolytic capacitor C345, chip capacitors C126, C127 and C128; fuse F5, mains supply connector J29, and electrostatic protection ESD 51; the storage battery (10.5V-13.5V) power supply circuit 2 mainly comprises: schottky diodes D6, D7 and D26, P-channel MOS tube Q64, resistors R445 and R446, fuse F6, storage battery connector J30, electrolytic capacitor C317 and ceramic chip capacitors C133 and C135.
The connection relationship among the components is as follows: the commercial power is connected to the circuit board through a commercial power connector J29 and then connected to the anodes of Schottky diodes D38 and D5 through a fuse F5, the cathodes of D38 and D5 are connected to an SYS _ VCCIN (6V-15V) input pin of a DC \ DC voltage reduction chip U1, and the voltage reduction chip U1 is connected to a VCC4V2IN pin of a host through a VCCOUT pin after the voltage is reduced to 4.2V so as to provide working voltage for the host; the first pin of the P-channel MOS transistor Q64 is respectively connected to DCIN18V and ground through R445 and R446, and at this time, the pin 3 and the pin 2 of the control Q64 are cut off, and the mains supply supplies power to the host. The storage battery is connected to the circuit board through a storage battery connector J30, and is connected to anodes of Schottky diodes D26, D6 and D7 and a 3 pin of a P-channel MOS tube Q64 through a fuse F6, cathodes of the Schottky diodes D26, D6 and D7 and a 2 pin of the P-channel MOS tube Q64 are connected to a SYS _ VCCIN (6V-15V) input pin of a DC \ DC step-down chip U1, the voltage of the voltage-down chip U1 is reduced to 4.2V, and then the voltage is connected to a VCC4V2IN pin of a host through a VCCOUT pin, so as to provide working voltage for the host, a first pin of the P-channel MOS tube Q64 is respectively connected to DCIN18V and the ground through R445 and R446, and at the time, the 3 pin and the 2 pin of the Q64 are controlled to be conducted, so that the storage battery supplies power to the host. DCIN18V goes to ground through capacitors C345, C126, C127, C128, and VBAT13V5 goes to ground through capacitors C317, C135, C136.
The working principle of the seamless switching circuit is as follows:
when the mains supply (DCIN18V) and the storage battery (BAT13.5V) are connected to the circuit board at the same time to supply power to the host, the Schottky diodes D38 and D5 are in forward conduction to supply power to the host, and the voltage at SYC _ VCC is higher than BAT13.5V, so that the Schottky diodes D26, D6 and D7 are in reverse cut-off, namely when the mains supply is not powered off, the mains supply is prioritized to reduce frequent use of the storage battery, and the loss of the storage battery is increased.
When the DCIN18V is turned off, equivalent to a mains outage, the capacitors C345, C126, C127 and C128 begin to discharge, the charging and discharging unit composed of these capacitors takes more than 5 milliseconds to discharge from 12V to 5V, since the voltage at SYC _ VCC (no more than 12V) is lower than BAT13.5V, the Schottky diodes D26, D6 and D7 are conducted in forward direction, the time required by the forward conduction is only tens of nanoseconds, that is, when the commercial power is cut off, the capacitors C345, C126, C127 and C128 discharge to strive for a certain delay time for the storage battery to switch into the circuit, when the schottky diodes D26, D6 and D7 are turned on in the forward direction, the voltage at SYC _ VCC is higher than the voltage at the positive terminals of the schottky diodes D5 and D38 (no more than 12V), at which time the schottky diodes D5 and D38 are turned off in the reverse direction, namely, the power supply phase of the storage battery is successfully switched to at the moment, and the interruption or the crash of the host machine due to sudden power failure can not be caused.
Based on the introduction, the utility model provides a problem that frequent switching caused load outage, operating system to break off or crash when commercial power battery was indefinite can be solved to seamless switching circuit, has guaranteed user's data information safety, has promoted the user experience goodness, just the utility model provides a seamless switching circuit is with low costs, has extensive application prospect in equipment such as cash register.
Finally, the utility model provides a cash register that contains above-mentioned seamless switching circuit because this cash register can satisfy the condition that the load was not cut off the power supply when the commercial power battery was not regularly frequently switched, therefore possesses longer life, and with low costs, is favorable to carrying out marketing.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A seamless switching circuit for a mains storage battery, the seamless switching circuit comprising:
the commercial power input end is coupled with commercial power and outputs a first direct current after rectification and voltage stabilization;
a power supply output coupled to a load;
a power supply node coupled to the power supply output;
the input end of the first diode unit is coupled with the mains supply input end, and the first diode unit is in forward conduction when the voltage value of the input end of the first diode unit is greater than the voltage value of the power supply node; the reverse cut-off is carried out when the voltage value of the input end of the reverse cut-off is smaller than the voltage value of the power supply node;
the charging and discharging unit is coupled with the mains supply input end, executes the operation of a charging mode when the mains supply input end has first direct current output, executes the operation of a discharging mode when the mains supply input end does not have the first direct current output, and outputs direct current to the power supply node through the first diode unit;
an electrical storage input coupled to the battery, the electrical storage input outputting a second direct current;
a second diode unit having an input coupled to the storage input, the second diode unit being turned off in the reverse direction when the voltage value at its input is less than the voltage value at the supply node; when the voltage value of the input end of the power storage device is larger than the voltage value of the power supply node, the power storage device is conducted in the forward direction, and second direct current output by the power storage input end is transmitted to the power supply node through the second diode unit;
when the mains supply is powered, the voltage value at the power supply node is larger than the voltage value at the input end of the second diode unit; when the mains supply is powered off, the voltage value at the power supply node is smaller than the voltage value at the input end of the second diode unit.
2. The seamless switching circuit for a commercial power storage battery as claimed in claim 1, wherein the first diode unit comprises at least one diode, and the anode of the diode is connected with the commercial power input end and the cathode of the diode is connected with the power supply node.
3. The seamless switching circuit for a commercial power storage battery as claimed in claim 1, wherein the second diode unit comprises at least one diode, and the anode of the diode is connected with the storage input end and the cathode of the diode is connected with the power supply node.
4. The seamless switching circuit for a mains battery according to claim 2 or 3, wherein the diodes are schottky diodes.
5. The mains battery seamless switching circuit of claim 4, wherein the first diode unit comprises two parallel-connected Schottky diodes and the second diode unit comprises three parallel-connected Schottky diodes.
6. The seamless switching circuit for a commercial power storage battery according to claim 1, wherein the charge and discharge unit comprises at least one capacitor.
7. The seamless switching circuit for a commercial power storage battery according to claim 6, wherein the charging and discharging unit comprises an electrolytic capacitor and three ceramic capacitors.
8. The mains battery seamless switching circuit of claim 1, further comprising: the voltage reduction chip is coupled with the power supply node at the input end and coupled with the power supply output end at the output end, and reduces the voltage value of the direct current output from the power supply node to the power supply voltage value required by the load.
9. The seamless switching circuit for a commercial power storage battery according to claim 1, further comprising a MOS transistor unit connected in parallel with the second diode unit, wherein the MOS transistor unit comprises at least one P-channel MOS transistor.
10. A cash register comprising the seamless switching circuit for commercial power storage batteries according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920827258.7U CN209948780U (en) | 2019-05-31 | 2019-05-31 | Commercial power storage battery seamless switching circuit and cash register |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920827258.7U CN209948780U (en) | 2019-05-31 | 2019-05-31 | Commercial power storage battery seamless switching circuit and cash register |
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| Publication Number | Publication Date |
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| CN209948780U true CN209948780U (en) | 2020-01-14 |
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| CN201920827258.7U Active CN209948780U (en) | 2019-05-31 | 2019-05-31 | Commercial power storage battery seamless switching circuit and cash register |
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