Seamless switching uninterruptible power supply device

Abstract

The utility model relates to the technical field of uninterruptible power supplies, in particular to a seamless switching uninterruptible power supply device. The uninterruptible power supply device comprises an external power supply input end, a standby power supply, an output end, a power conversion circuit and a main control module, the input end of the external power supply is connected with the output end through the first diode; the power conversion circuit is connected with the output end through a second diode; the standby power supply supplies power to the output end through the power conversion circuit and the second diode; the main control module is connected with the control end of the power conversion circuit and adjusts the standby power supply voltage output by the power conversion circuit, and the external power supply voltage output by the external power supply input end is larger than the standby power supply voltage. According to the utility model, the external power supply voltage output by the external power supply input end is greater than the standby power supply voltage through the power conversion circuit, so that the output end only receives the electric energy of the external power supply input end.

Description

TECHNICAL FIELD

[0001] The utility model relates to uninterrupted power supply technical field, concretely relates to a seamless switching uninterrupted power supply device. BACKGROUND

[0002] The input end and battery discharge switching time of the current industry DCUPS and ACUPS are between 10-20mS, because of the switching time, the electronic equipment is influenced seriously, for example, in some data storage equipment or other electronic equipment, because of the switching time problem, the electronic equipment cannot save data in time, and the important information or data of the equipment is lost. UTILITY MODEL CONTENTS

[0003] The utility model solves the technical problem, in view of the above -mentioned defects of prior art, provide a seamless switching uninterrupted power supply device, solve the problem of the switching time of commercial power outage and cause the problem of electronic equipment damage or not in time to save the data.

[0004] The utility model adopts the technical scheme in the technical problem: provide a seamless switching uninterrupted power supply device, the uninterrupted power supply device includes external power input end, spare power supply, output end, power conversion circuit and master control module,

[0005] The external power input end is connected with the output end through the first diode,

[0006] The power conversion circuit is connected with the output end through the second diode,

[0007] The spare power supply is powered for the output end through the power conversion circuit and the second diode,

[0008] Among them,

[0009] The control end of the master control module is connected with the power conversion circuit, adjusts the spare power supply voltage that the power conversion circuit outputs, and the external power supply voltage that the external power input end outputs is greater than the spare power supply voltage.

[0010] Among them, the preferred scheme is: the VF value of the first diode is set as the first voltage value, and the external power supply voltage is greater than the sum of the spare power supply voltage and the first voltage value.

[0011] Among them, the preferred scheme is: the uninterrupted power supply device further includes a first voltage detection circuit and a first MOS tube, the first voltage detection circuit is connected in parallel between the external power input end and the output end, and the two on-off ends of the first MOS tube are connected to the two ends of the first diode, and the control end of the first MOS tube and the first detection end of the first voltage detection circuit are connected with the master control module respectively.

[0012] The uninterrupted power supply device further comprises a second voltage detection circuit and a second MOS tube, the second voltage detection circuit is connected in parallel between the standby power supply and the power conversion circuit, and two ends of the second MOS tube are connected to two ends of a second diode, and the control module is connected to a control end of the second MOS tube and a second detection end of the second voltage detection circuit.

[0013] Preferably, the first voltage detection circuit comprises a first resistor and a second resistor connected in series, the other end of the first resistor is connected in parallel between the external power input end and the first diode, the other end of the second resistor is grounded, and a node between the first resistor and the second resistor serves as the first detection end; the second voltage detection circuit comprises a third resistor and a fourth resistor connected in series, the other end of the third resistor is connected in parallel between the standby power supply and the power conversion circuit, the other end of the fourth resistor is grounded, and a node between the third resistor and the fourth resistor serves as the second detection end.

[0014] Preferably, the uninterrupted power supply device further comprises a voltage feedback adjustment circuit, the voltage feedback adjustment circuit is connected between the power conversion circuit and the output end, a control end of the voltage feedback adjustment circuit is connected to the control module, and a feedback end of the voltage feedback adjustment circuit is connected to the power conversion circuit.

[0015] Preferably, the voltage feedback adjustment circuit comprises a fifth resistor, a sixth resistor, a seventh resistor and a third MOS tube, the fifth resistor and the sixth resistor are connected in series, the other end of the fifth resistor is connected in parallel between the power conversion circuit and the output end, the other end of the sixth resistor is grounded, a node between the fifth resistor and the sixth resistor serves as the feedback end, one end of the seventh resistor is also connected to the node between the fifth resistor and the sixth resistor, two ends of the third MOS tube are respectively connected to the other end of the seventh resistor and the ground, and a control end of the third MOS tube is connected to the control module.

[0016] Preferably, the voltage feedback adjustment circuit further comprises at least one eighth resistor and a fourth MOS tube, one end of the eighth resistor is also connected to the node between the fifth resistor and the sixth resistor, two ends of the fourth MOS tube are respectively connected to the other end of the eighth resistor and the ground, and a control end of the fourth MOS tube is connected to the control module.

[0017] Preferably, the power conversion circuit is one of a BUCK circuit, a BOOST circuit and a BUCK-BOOST circuit, the power conversion circuit further comprises an error amplifier and a PWM comparator, the error amplifier comprises a first reference voltage terminal, a second reference voltage terminal and an error output terminal, the first reference voltage terminal is connected with the feedback terminal of the voltage feedback regulation circuit, the second reference voltage terminal is connected with a reference voltage value, the error output terminal is connected with the first input terminal of the PWM comparator, the second input terminal of the PWM comparator is connected with the PWM output terminal of the master control module, and the output terminal of the PWM comparator is connected with the control terminal of the BUCK circuit, the BOOST circuit or the BUCK-BOOST circuit.

[0018] Preferably, the uninterruptible power supply device further comprises a charging control circuit, two on-off terminals of the charging control circuit are connected with the external power input terminal and the backup power source respectively, and the control terminal of the charging control circuit is connected with the master control module.

[0019] Preferably, the master control module comprises a master control chip and a voltage chip, one pin of the master control chip is connected with the control terminal of the power conversion circuit, the VCC pin of the master control chip is connected with the output terminal of the voltage chip, and the input terminal of the voltage chip is connected with the external power input terminal and the backup power source respectively.

[0020] Compared with the prior art, the external power voltage output by the external power input terminal is greater than the backup power voltage through the power conversion circuit, so that the output terminal only receives the electric energy of the external power input terminal; when the external power input terminal is powered off, the electric energy of the backup power source is seamlessly switched and transmitted to the output terminal, without the need of software switching of the master control module, so that the power supply is not powered off after the commercial power is powered off, and stable electric energy is provided for the load before the backup power is used up. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be described further below in combination with the drawings and examples, and the drawings are as follows:

[0022] Figure 1 is the circuit principle block diagram of the uninterruptible power supply device of the utility model;

[0023] Figure 2 is the circuit principle block diagram of the uninterruptible power supply device with detection circuit of the utility model;

[0024] Figure 3 is the circuit principle block diagram of the uninterruptible power supply device with voltage feedback regulation circuit of the utility model;

[0025] Figure 4The utility model is the circuit principle block diagram of uninterrupted power supply device with charging control circuit.

[0026] Figure 5 The utility model is the circuit principle diagram of uninterrupted power supply device. DETAILED DESCRIPTION

[0027] The preferred embodiments of the uninterrupted power supply device with seamless switching will be described in detail with reference to the drawings.

[0028] As Figures 1 to 5 shown, the utility model provides a kind of seamless switching uninterrupted power supply device preferred embodiment.

[0029] A kind of seamless switching uninterrupted power supply device, the uninterrupted power supply device includes external power input terminal 100, backup power supply 200, output end 300, power conversion circuit 400 and master module 500;External power input terminal 100 is connected with output end 300 by first diode 610;Power conversion circuit 400 is connected with output end 300 by second diode 620;Backup power supply 200 is powered for output end 300 by power conversion circuit 400, second diode 620;Wherein, the control end of master module 500 is connected with power conversion circuit 400, adjusts the backup power supply voltage Vo that power conversion circuit 400 exports, the external power supply voltage Vin exported by external power input terminal 100 is greater than backup power supply voltage Vo.

[0030] Wherein, the anode of first diode 610 is connected with external power input terminal 100, the cathode of first diode 610 is connected with output end 300, the anode of second diode 620 is connected with power conversion circuit 400, the cathode of second diode 620 is connected with output end 300.

[0031] Specifically, external power input terminal 100 is preferably connected to mains, or connected to mains through adapter, and external power is input into uninterrupted power supply device through external power input terminal 100, and also powers the load connected to output end 300 through first diode 610;At the same time, power conversion circuit 400 also works, and the power of backup power supply 200 is also converted by power conversion circuit 400, and also powers output end 300, but the external power supply voltage Vin exported by external power input terminal 100 is greater than backup power supply voltage Vo through power conversion circuit 400, so that output end 300 only receives the power of external power input terminal 100.And when external power input terminal 100 is powered off, the power of backup power supply 200 is seamlessly switched to output end 300, and does not need the software switching of master module 500.It is guaranteed that mains will not be powered off after mains is powered off, and stable power is provided for load before the power of backup power supply 200 is exhausted.

[0032] When the external power supply voltage Vin output by the external power supply input end 100 is greater than the backup power supply voltage Vo, the output end 300 will preferentially receive the electric energy of the external power supply input end 100, because the circuit will automatically select the power supply according to the voltage, ensuring that when the external power supply is normal, the load device will obtain stable electric energy from the external power supply input end 100, and will not consume the electric energy of the backup power supply 200. Only when the external power supply input end 100 is powered off, the backup power supply 200 will seamlessly switch to the output end 300 for power supply, ensuring the continuous operation of the load device.

[0033] Among them, regarding the first diode 610, the first diode 610 is connected between the external power supply input end 100 and the output end 300. When the external power supply is normal, the first diode 610 will be turned on, allowing the electric energy of the external power supply input end 100 to flow to the output end 300, providing stable electric energy for the load device. When the external power supply is powered off, the first diode 610 will prevent the backup power supply 200 from flowing in reverse to the external power supply input end 100, thereby maintaining the flow direction of electric energy in the circuit, ensuring that the backup power supply 200 can seamlessly switch to the output end 300 for power supply.

[0034] Among them, regarding the second diode 620, the second diode 620 is connected between the power conversion circuit 400 and the output end 300. When the external power supply is normal, the second diode 620 will prevent the electric energy of the external power supply input end 100 from flowing in reverse to the power conversion circuit 400. When the external power supply is powered off, the second diode 620 will be turned on, allowing the power conversion circuit 400 to convert and output the electric energy of the backup power supply 200 to the output end 300.

[0035] In this embodiment, the VF value of the first diode 610 is set as a first voltage value, and the external power supply voltage Vin is greater than the sum of the backup power supply voltage Vo and the first voltage value. Specifically, the VF value of the first diode 610 is normally 0.4V, so the first voltage value is 0.4V. When the external power supply is powered off, because the VF value (0.4V) of the first diode 610 is taken into account, the backup power supply 200 can seamlessly switch to the output end 300 for power supply without relying on software switching, ensuring that even in the case of sudden power failure of the external power supply, the load device can continue to operate without interruption due to power switching. The VF value of the first diode 610 also plays a role in protecting the circuit. When the external power supply is powered off, the first diode 610 will prevent the backup power supply 200 from flowing in reverse to the external power supply input end 100, thereby maintaining the flow direction of electric energy in the circuit, ensuring that the backup power supply 200 can seamlessly switch to the output end 300 for power supply.

[0036] Wherein, for some data storage devices or other electronic devices in input power outage, because of the switching time problem causes the electronic device to save data, resulting in the loss of important information or data of the device, through seamless switching, ensure that the power is not off after the power outage, before the battery power is safe to save information or important data and then safe shutdown.

[0037] Reference Figure 5 , the external power input end 100 for vin, the standby power 200 for vbat, the output end 300 for vout, the first diode 610 for D1, the second diode 620 for D2.

[0038] As Figure 2 And Figure 5 The utility model provides the preferred embodiment of first voltage detection circuit 810 and second voltage detection circuit 820.

[0039] The uninterrupted power supply device further includes a first voltage detection circuit 810 and a first MOS tube 710, the first voltage detection circuit 810 is connected in parallel between the external power input end 100 and the output end 300, and the two on-off ends of the first MOS tube 710 are connected to the two ends of the first diode 610, and the control end of the first MOS tube 710 and the first detection end of the first voltage detection circuit 810 are connected with the main control module 500 respectively;The uninterrupted power supply device further includes a second voltage detection circuit 820 and a second MOS tube 720, the second voltage detection circuit 820 is connected in parallel between the standby power 200 and the power conversion circuit 400, and the two on-off ends of the second MOS tube 720 are connected to the two ends of the second diode 620, and the control end of the second MOS tube 720 and the second detection end of the second voltage detection circuit 820 are connected with the main control module 500 respectively.

[0040] Wherein, the first MOS tube 710 is Q1, and the second MOS tube 720 is Q2.

[0041] The first voltage detection circuit 810 is connected in parallel between the external power input end 100 and the output end 300, for real-time monitoring the voltage and load condition of external power supply.Set different load conditions, when the first voltage detection circuit 810 detects that the load is heavy, for example full load or 0.5 times, the main control module 500 controls the first MOS tube 710 to conduct, to improve the current supply, ensure that the load device can obtain sufficient power when the external power supply works normally.

[0042] Similarly, the second voltage detection circuit 820 is connected in parallel between the backup power supply 200 and the power conversion circuit 400, for real-time monitoring of the voltage and load condition of the backup power supply 200. Different load conditions are set, and when the second voltage detection circuit 820 detects that the load is heavy, for example, full load or 0.5 times, the master control module 500 controls the second MOS tube 720 to conduct, so as to increase the current supply and ensure that the load equipment can also obtain sufficient power when the backup power supply 200 is working.

[0043] Through the cooperation of the above-mentioned voltage detection circuit and the MOS tube, the current supply is dynamically adjusted according to the change of the load, and stable operation of the load equipment can be ensured whether the external power supply or the backup power supply 200 is working. When the load is heavy, the current is increased by controlling the MOS tube to conduct, so as to avoid performance degradation or damage of the equipment due to insufficient current, and the efficiency and reliability of the entire power supply system are improved.

[0044] In the embodiment, the first voltage detection circuit 810 includes a first resistor R1 and a second resistor R2 connected in series, the other end of the first resistor R1 is connected in parallel between the external power supply input end 100 and the first diode 610, the other end of the second resistor R2 is grounded, and the node between the first resistor R1 and the second resistor R2 serves as a first detection end; the second voltage detection circuit 820 includes a third resistor R4 and a fourth resistor R5 connected in series, the other end of the third resistor R4 is connected in parallel between the backup power supply 200 and the power conversion circuit 400, the other end of the fourth resistor R5 is grounded, and the node between the third resistor R4 and the fourth resistor R5 serves as a second detection end.

[0045] The first voltage detection circuit 810 is based on the resistance voltage division principle and is used for detecting the voltage between the external power supply input end 100 and the output end 300. When the voltage of the external power supply input end 100 changes, a voltage value proportional to the input voltage is obtained at the first detection end through the voltage division of the first resistor R1 and the second resistor R2, so as to realize the monitoring of the external power supply voltage Vin. Similarly, the second voltage detection circuit 820 is also based on the resistance voltage division principle, and the second voltage detection circuit 820 is used for detecting the voltage between the backup power supply 200 and the power conversion circuit 400. A voltage value proportional to the backup power supply voltage Vo is obtained at the second detection end through the voltage division of the third resistor R4 and the fourth resistor R5, so as to realize the monitoring of the backup power supply voltage Vo.

[0046] By accurately selecting the resistance value of the resistor, an accurate voltage division ratio is obtained, and accurate monitoring of the power supply voltage is realized. Moreover, the resistance voltage division circuit has simple structure, is easy to realize, and has high reliability.

[0047] As Figure 3 and Figure 5The preferred embodiment of the voltage feedback regulation circuit 900 is shown.

[0048] The uninterrupted power supply device further comprises a voltage feedback regulation circuit 900 connected between the power conversion circuit 400 and the output end 300, and a control end of the voltage feedback regulation circuit 900 is connected with the main control module 500, and a feedback end of the voltage feedback regulation circuit 900 is connected with the power conversion circuit 400. The power conversion circuit 400 is one of a BUCK circuit, a BOOST circuit and a BUCK-BOOST circuit, and the power conversion circuit 400 further comprises an error amplifier and a PWM comparator, the error amplifier comprises a first reference voltage end, a second reference voltage end and an error output end 300, the first reference voltage end is connected with the feedback end of the voltage feedback regulation circuit 900, the second reference voltage end is connected with a reference voltage value, the error output end 300 is connected with a first input end of the PWM comparator, a second input end of the PWM comparator is connected with a PWM output end 300 of the main control module 500, and an output end 300 of the PWM comparator is connected with a control end of the BUCK circuit, the BOOST circuit or the BUCK-BOOST circuit.

[0049] Specifically, the voltage feedback regulation circuit 900 is connected between the power conversion circuit 400 and the output end 300, and participates in the regulation process of the output voltage of the power conversion circuit 400. The control end of the voltage feedback regulation circuit 900 is connected with the main control module 500, and the main control module 500 adjusts the working state of the voltage feedback regulation circuit 900 according to the required output voltage, mainly including two aspects: when the external power supply is normally working, ensuring that the external power supply voltage Vin output by the external power supply input end 100 is greater than the standby power supply voltage Vo; and when the external power supply is powered off, improving the output voltage of the power conversion circuit 400. The feedback end of the voltage feedback regulation circuit 900 is connected with the power conversion circuit 400, and is used for feeding back the actual value of the output voltage to the power conversion circuit 400 for regulation.

[0050] The power conversion circuit 400 is a BUCK circuit (voltage reduction), a BOOST circuit (voltage increase) or a BUCK-BOOST circuit (voltage increase and decrease), and the specific type depends on the design requirements and application scenarios of the power supply device. The power conversion circuit 400 comprises an error amplifier, compares the actual output voltage (fed back through the voltage feedback regulation circuit 900) with a preset reference voltage value, and generates an error signal.

[0051] The first reference voltage terminal is connected with the feedback terminal of the voltage feedback regulation circuit 900, and receives the feedback signal of the actual output voltage; the second reference voltage terminal is connected with a reference voltage value, which is the expected output voltage value; and the error output terminal 300 outputs the error signal to the PWM comparator for further regulation.

[0052] The PWM comparator receives the error signal of the error amplifier and the PWM signal of the master control module 500, compares the two signals and generates a PWM output for controlling the power conversion circuit 400. The first input terminal receives the error output signal of the error amplifier, the second input terminal receives the PWM output signal of the master control module 500, and the output terminal 300 outputs the comparison result to the control terminal of the power conversion circuit 400 for regulating the working state of the circuit.

[0053] Specific working principle: The voltage feedback regulation circuit 900 provides the feedback signal of the actual output voltage, the error amplifier compares the feedback signal with the preset reference voltage value, and generates an error signal. The PWM comparator generates a regulation signal according to the error signal and the PWM signal of the master control module 500, for controlling the switching elements (such as MOSFET) of the power conversion circuit 400, so as to regulate the output voltage. The master control module 500 dynamically adjusts the PWM signal according to the real-time feedback of the load change and the output voltage, so as to maintain the stability of the output voltage.

[0054] In the embodiment, the voltage feedback regulation circuit 900 includes a fifth resistor R3, a sixth resistor R6, a seventh resistor R7 and a third MOS tube M1. The fifth resistor R3 and the sixth resistor R6 are connected in series, and the other end of the fifth resistor R3 is connected in parallel between the power conversion circuit 400 and the output terminal 300. The other end of the sixth resistor R6 is grounded. The node between the fifth resistor R3 and the sixth resistor R6 is used as the feedback terminal. One end of the seventh resistor R7 is also connected in parallel to the node between the fifth resistor R3 and the sixth resistor R6. The two terminals of the third MOS tube M1 are connected with the other end of the seventh resistor R7 and the ground respectively. The control terminal of the third MOS tube M1 is connected with the master control module 500.

[0055] The voltage feedback regulation circuit 900 realizes the monitoring and regulation of the output voltage of the power conversion circuit 400 through the combination of the fifth resistor R3, the sixth resistor R6, the seventh resistor R7, and the third MOS tube M1. The fifth resistor R3 and the sixth resistor R6 are connected in series, the other end of the fifth resistor R3 is connected in parallel between the power conversion circuit 400 and the output terminal 300, and the other end of the sixth resistor R6 is grounded. The node between them serves as a feedback terminal, which is used to obtain the voltage ratio between the power conversion circuit 400 and the output terminal 300 as a feedback signal based on the resistance voltage division principle. In addition, one end of the seventh resistor R7 is also connected in parallel to the node between the fifth resistor R3 and the sixth resistor R6, which further adjusts the voltage value of the feedback terminal and increases the flexibility and regulation capability of the circuit. The two on-off ends of the third MOS tube M1 are connected to the other end of the seventh resistor R7 and the ground, respectively, and the control end is connected to the main control module 500. The MOS tube serves as an execution element for voltage regulation and adjusts the conduction state according to the instructions of the main control module 500, thereby changing the current in the circuit and affecting the output voltage.

[0056] In the BUCK circuit for step-down, the voltage feedback regulation circuit 900 ensures that the output voltage is lower than the input voltage while maintaining stability. In the BOOST circuit for step-up, the voltage feedback regulation circuit 900 ensures that the output voltage is higher than the input voltage and is stable. In the BUCK-BOOST circuit for step-up and step-down, the voltage feedback regulation circuit 900 can adapt to the changes between the input voltage and the output voltage, ensuring the stability and accuracy of the output voltage.

[0057] In addition, the working principle of the voltage feedback regulation circuit 900 is based on negative feedback mechanism. The main control module 500 dynamically adjusts the PWM signal by monitoring the voltage signal of the feedback terminal to control the switching elements (such as MOSFET) in the power conversion circuit 400, thereby regulating the output voltage, so that the uninterruptible power supply device can accurately control the output voltage, adapt to different load conditions and input voltage changes, and ensure the stability and reliability of the power supply.

[0058] Further, the voltage feedback regulation circuit 900 further comprises at least one eighth resistor R8 and a fourth MOS tube M2. One end of the eighth resistor R8 is also connected in parallel to the node between the fifth resistor R3 and the sixth resistor R6. The two on-off ends of the fourth MOS tube M2 are connected to the other end of the eighth resistor R8 and the ground, respectively. The control end of the fourth MOS tube M2 is connected to the main control module 500.

[0059] One end of the eighth resistor R8 is connected in parallel to the node between the fifth resistor R3 and the sixth resistor R6, that is, the feedback end, and the other end is grounded, the addition of the eighth resistor R8 provides the circuit with additional voltage division and adjustment capability, which can further fine-tune the voltage value of the feedback signal to adapt to different working conditions and requirements. The two on-off ends of the fourth MOS tube M2 are connected to the other end of the eighth resistor R8 and grounded, respectively, and the control end of the MOS tube is connected with the master control module 500, the master control module 500 can dynamically adjust the influence of the eighth resistor R8 on the feedback signal by controlling the on and off state of the fourth MOS tube M2, thereby realizing more fine voltage adjustment.

[0060] By adjusting the on state of the fourth MOS tube M2, the influence of the eighth resistor R8 on the feedback signal can be changed, and more fine voltage adjustment can be realized. The master control module 500 can dynamically adjust the working state of the fourth MOS tube M2 according to the real-time voltage feedback signal, so as to adapt to the change of load or the fluctuation of input voltage and ensure the stability of output voltage.

[0061] Finally, in the BUCK, BOOST or BUCK-BOOST circuit, the error amplifier compares the actual output voltage (feedback by the voltage feedback regulation circuit 900) with the preset reference voltage value to generate an error signal. The PWM comparator generates a PWM output for controlling the power conversion circuit 400 according to the error signal and the PWM signal of the master control module 500. The newly added eighth resistor R8 and fourth MOS tube M2 can be regarded as part of the voltage feedback regulation circuit 900, which adjusts the voltage value of the feedback signal, thereby affecting the output of the error amplifier, and further affecting the comparison result of the PWM comparator and the final PWM output, realizing accurate control of the output voltage.

[0062] In the utility model, a seamless switching control scheme is provided:

[0063] A, after initialization, after the external power input end 100 is connected with AC-DC adapter or AC-DC charger, the master control module 500 detects the input voltage of the external power input end 100 by the first voltage detection circuit 810 simultaneously, and controls the power conversion circuit 400 to start working simultaneously;

[0064] B, at this time, the first MOS tube 710 and the second MOS tube 720 are not opened;

[0065] C, the voltage feedback regulation circuit 900 carries out feedback adjustment according to the output voltage of the power conversion circuit 400, guarantees that the external power voltage Vin is greater than the sum of the standby power voltage Vo and the first voltage value, and the standby power voltage Vo is in the range of load device supply voltage (that is, the standby power voltage Vo is greater than the input undervoltage point of the power supply device).

[0066] D, at this time the external power supply input end 100 provides power to the load device, when the load is heavy, the first MOS tube 710 opens;

[0067] E, when the external power supply input end 100 is powered off, because the external power supply voltage Vin is greater than the backup power supply voltage Vo, the backup power supply voltage Vo automatically flows to the output end 300 through the second diode 620, because the processing of the master control module 500 is not required, the switching time is seamless at this moment, and it can also be considered that the time is very short, short to the point of being negligible;

[0068] F, at the same time, the master control module 500 also detects that the external power supply voltage Vin is less than the backup power supply voltage Vo through the second voltage detection circuit 820, closes the first MOS tube 710, adjusts the voltage feedback regulation circuit 900, and makes the backup power supply voltage Vo output by the power conversion circuit 400 rise, and detects the size of the load to open or close the second MOS tube 720;

[0069] G, when the external power supply input end 100 is powered on, the master control module 500 continues to adjust the voltage feedback regulation circuit 900, so that the external power supply voltage Vin is greater than the sum of the backup power supply voltage Vo and the first voltage value, and the mains is automatically switched to the output end 300 seamlessly.

[0070] As shown in Figure 4 and Figure 5 The utility model provides the preferred embodiment of charging control circuit 1000.

[0071] The uninterrupted power supply device further comprises a charging control circuit 1000, two on-off ends of the charging control circuit 1000 are connected with an external power supply input end 100 and a backup power supply 200 respectively, and a control end of the charging control circuit 1000 is connected with a master control module 500.

[0072] The two on-off ends of the charging control circuit 1000 are connected with the external power supply input end 100 and the backup power supply 200 respectively, and the electric energy flow between the external power supply and the backup power supply 200 is controlled. The control end is connected with the master control module 500, allowing the master control module 500 to dynamically adjust the working mode of the charging control circuit 1000 according to the working state of the power supply device and the charging demand of the battery. The charging control circuit 1000 is responsible for managing the electric energy flow between the external power supply and the backup power supply 200, ensuring that the backup power supply 200 (such as a battery) can be effectively charged when the external power supply is normal, and the backup power supply 200 will not flow through the external power supply input end 100 when the external power supply is interrupted. Through the connection with the master control module 500, the charging control circuit 1000 can monitor the charging state of the battery in real time, including the charging current, voltage and temperature, etc., to ensure the safety and efficiency of the charging process.

[0073] As shown in Figure 5As shown, the utility model provides preferred embodiment of charging control circuit 1000.

[0074] The main control module comprises a main control chip U2 and a voltage chip U1, a pin of the main control chip U2 is connected with the control end of the power conversion circuit 400, the VCC pin of the main control chip U2 is connected with the output end 300 of the voltage chip U1, and the input end of the voltage chip U1 is connected with the external power input end 100 and the standby power 200 respectively.

[0075] The main control chip U2 is the core of the main control module, and is responsible for processing various control logic and algorithms of the power supply device.

[0076] The connection with the enable end of the power conversion circuit 400 is mainly to provide a PWM (pulse width modulation) signal for the PWM comparator to adjust the working state of the power conversion circuit 400, so as to control the output voltage and current.

[0077] Further, the voltage chip U1 manages the power from the external power input end 100 and the standby power 200, ensures that the main control chip U2 is stably powered, and can keep normal work even in the case of external power fluctuation or interruption. The design of the main control module ensures the stability and reliability of the whole uninterruptible power supply device, and the precise control of the main control chip U2 and the stable power supply of the voltage chip U1 jointly improve the performance of the power supply device under various working conditions.

[0078] The above is only the best embodiment of the utility model, and is not used to limit the scope of the utility model, and equivalent changes or modifications made in the scope of the utility model application patent are covered by the utility model.

Claims

1. An uninterruptible power supply apparatus for seamless switchover, characterized by comprising: The uninterrupted power supply device comprises an external power input end, a backup power supply, an output end, a power conversion circuit and a main control module; The external power input end is connected with the output end through a first diode; The power conversion circuit is connected with the output end through a second diode; The backup power supply supplies power to the output end through the power conversion circuit and the second diode; The main control module is connected with the control end of the power conversion circuit, and adjusts the backup power supply voltage output by the power conversion circuit, wherein the external power supply voltage output by the external power input end is greater than the backup power supply voltage. The VF value of the first diode is set as a first voltage value, and the external power supply voltage is greater than the sum of the backup power supply voltage and the first voltage value.

2. The uninterruptible power supply device of claim 1, wherein: The uninterrupted power supply device further comprises a first voltage detection circuit and a first MOS tube, the first voltage detection circuit is connected in parallel between the external power input end and the output end, and the two conducting ends of the first MOS tube are connected to the two ends of the first diode, and the main control module is connected with the control end of the first MOS tube and the first detection end of the first voltage detection circuit respectively; 3. The uninterruptible power supply device of claim 1, wherein: The uninterrupted power supply device further comprises a second voltage detection circuit and a second MOS tube, the second voltage detection circuit is connected in parallel between the backup power supply and the power conversion circuit, and the two conducting ends of the second MOS tube are connected to the two ends of the second diode, and the main control module is connected with the control end of the second MOS tube and the second detection end of the second voltage detection circuit respectively. The first voltage detection circuit comprises a first resistor and a second resistor connected in series, the other end of the first resistor is connected in parallel between the external power input end and the first diode, the other end of the second resistor is grounded, and the node between the first resistor and the second resistor serves as the first detection end; the second voltage detection circuit comprises a third resistor and a fourth resistor connected in series, the other end of the third resistor is connected in parallel between the backup power supply and the power conversion circuit, the other end of the fourth resistor is grounded, and the node between the third resistor and the fourth resistor serves as the second detection end.

4. The uninterruptible power supply device of claim 3, wherein: The uninterrupted power supply device further comprises a voltage feedback regulation circuit, the voltage feedback regulation circuit is connected between the power conversion circuit and the output end, and the control end of the voltage feedback regulation circuit is connected with the main control module, and the feedback end of the voltage feedback regulation circuit is connected with the power conversion circuit.

5. The uninterruptible power supply device of claim 1, wherein: The voltage feedback regulation circuit comprises a fifth resistor, a sixth resistor, a seventh resistor and a third MOS tube, the fifth resistor and the sixth resistor are connected in series, the other end of the fifth resistor is connected in parallel between the power conversion circuit and the output end, the other end of the sixth resistor is grounded, the node between the fifth resistor and the sixth resistor serves as the feedback end, one end of the seventh resistor is also connected in parallel to the node between the fifth resistor and the sixth resistor, the two conducting ends of the third MOS tube are connected with the other end of the seventh resistor and the ground respectively, and the control end of the third MOS tube is connected with the main control module.

6. The uninterruptible power supply device of claim 5, wherein: ​ 7. The uninterruptible power supply device of claim 6, wherein: The voltage feedback regulating circuit further comprises at least one eighth resistor and a fourth MOS transistor, one end of the eighth resistor is also connected in parallel to the node between the fifth resistor and the sixth resistor, two ends of the fourth MOS transistor are connected to the other end of the eighth resistor and the ground respectively, and the control end of the fourth MOS transistor is connected to the main control module.

8. The uninterruptible power supply device of claim 5, wherein: The power conversion circuit is one of a BUCK circuit, a BOOST circuit and a BUCK-BOOST circuit, the power conversion circuit further comprises an error amplifier and a PWM comparator, the error amplifier comprises a first reference voltage end, a second reference voltage end and an error output end, the first reference voltage end is connected to the feedback end of the voltage feedback regulating circuit, the second reference voltage end is connected to a reference voltage value, the error output end is connected to the first input end of the PWM comparator, the second input end of the PWM comparator is connected to the PWM output end of the main control module, and the output end of the PWM comparator is connected to the control end of the BUCK circuit, the BOOST circuit or the BUCK-BOOST circuit.

9. The uninterruptible power supply device of claim 1, wherein: The uninterruptible power supply device further comprises a charging control circuit, two ends of the charging control circuit are connected to the external power input end and the backup power source respectively, and the control end of the charging control circuit is connected to the main control module.

10. The uninterruptible power supply device of claim 1, wherein: The main control module comprises a main control chip and a voltage chip, one pin of the main control chip is connected to the control end of the power conversion circuit, the VCC pin of the main control chip is connected to the output end of the voltage chip, and the input end of the voltage chip is connected to the external power input end and the backup power source respectively.

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