A parallel-connected high-power power supply

Abstract

The present invention relates to a power stage DC power supply device, and particularly to a parallel high-power power supply. It includes a voltage source and at least one current source connected in parallel; the control terminals of the voltage source and the current source are simultaneously connected to a processor and receive control signals from the processor; the output terminals of the voltage source and the current source are simultaneously connected to both ends of the thyristor switch circuit. By setting a controllable parallel circuit of the voltage source and the current source, the present invention adopts a multi-stage parallel power supply mode when supplying power to a load that requires large current, and can arbitrarily control the output power of any one of them. And a separate output interface is left for each path of the parallel voltage source and current source. When needed, any one of the voltage source and the current source can be incorporated into the total output port by controlling the thyristor switch circuit to increase the power output, or the parallel branch strips of the total output port can be disconnected to reduce the power output.

Description

Technical Field

[0001] The present invention relates to a power stage DC power supply device, and particularly to a parallel-connected high-power power supply. Background Art

[0002] Currently, low-voltage high-power power supplies on the market are generally isolated and forward-type power supplies. The output current provided by such power supplies is usually between 50A and 100A. If a current exceeding this range needs to be output, the volume of the power supply usually increases sharply. The increase in the volume of the power supply means that more and larger heat dissipation devices are required, which further causes the overall volume of the power supply to be bulky and is not conducive to users carrying it with them or using it outdoors.

[0003] In addition, when the power output of a single power supply is insufficient, currently, the method of supplying power in parallel with multiple power supplies is mostly adopted. However, when multiple power supplies are used in parallel, various problems such as uncontrollable output power and power supply to power supply are likely to occur, resulting in damage to the power supply device.

[0004] In addition, since existing power supply devices are usually fixed-output devices, parameter changes cannot be realized during use. In applications involving different power-level devices, flexible conversion of output cannot be achieved, and the applicability is single. Users usually need to prepare power supplies with multiple output powers as spares, resulting in an increase in usage costs. Existing power supply devices usually do not have power output detection, and it is impossible to accurately determine the instrument failure in the first time when a failure occurs. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defect that various problems are likely to occur when multiple power supplies are used in parallel in the prior art, and to provide an integrated parallel-connected high-power power supply.

[0006] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0007] A parallel-connected high-power power supply includes a voltage source in parallel connection and at least one current source. In practice, the high-power power supply provided by the present invention can provide parallel outputs of 3, 4, 5 or even more voltage sources and current sources.

[0008] The control terminals of the voltage source and the current source are simultaneously connected to a processor and receive control signals from the processor. Specifically, the voltage source receives a reference DA voltage from the processor and outputs a specified voltage based on the reference DA voltage.

[0009] The output terminals of the voltage source and the current source are simultaneously connected to both ends of a thyristor switch circuit. It should be noted that when there is only one current source in the power supply, the current source and the voltage source are respectively connected to the positive terminal and the negative terminal of the same thyristor switch circuit; when there are more than two current sources in the power supply, the thyristor switch circuit connected to the voltage source is called the first thyristor switch circuit. At this time, only one current source is directly connected to the negative terminal of the first thyristor switch circuit, and the other current sources are respectively connected to the negative terminal of the first thyristor switch circuit through separately provided additional thyristor switch circuits.

[0010] Further, the voltage source includes a switching power supply controller. The switching power supply controller outputs a PWM wave to a half-bridge driver according to a processor control signal. The half-bridge driver converts the received PWM wave into two complementary driving PWM waves and respectively outputs them to the gates of a first MOSFET and a second MOSFET. The first MOSFET and the second MOSFET are connected in series. The drain of the first MOSFET is the power input terminal. The second MOSFET is connected in parallel with an LC filter circuit. The output terminal of the LC filter circuit is the output terminal of the voltage source; a voltage sampling circuit is further provided at the output terminal of the voltage source. The voltage sampling circuit feeds back the sampled voltage to the switching power supply controller and the processor.

[0011] In a specific embodiment, the switching power supply controller can use TL494P. When using this type of switching power supply controller, its pin 16 receives the sampled voltage fed back from the voltage sampling circuit. Pins 9 and 10 output a PWM wave in parallel. Pin 3 controls the duty cycle of the output PWM wave based on the comparison result between the sampled voltage and the reference DA voltage. In some embodiments, the half-bridge driver can adopt IR2104. Pin 2 of IR2104 is the input terminal, receiving the PWM wave output from the switching power supply controller, and complementary PWM waves are output from pins 7 and 5. IR2104 has a built-in output shutdown function. The output state is controlled by controlling the level of pin 3. When pin 3 is connected to a high level (VCC), the output is turned on. When connected to a low level (GND), the output is turned off. This function can be used for circuit protection. In addition, the complementary PWM output by IR2104 has a dead zone. The existence of the dead zone avoids the simultaneous conduction of the first MOSFET and the second MOSFET, causing circuit short circuit or heat loss, and can greatly improve the efficiency of the switching power supply. The voltage sampling circuit uses INA282. It should be noted that in order to avoid the sampled voltage exceeding the processing range of the processor, a voltage dividing circuit can be set to sample the output voltage.

[0012] Further, the current source includes a switching power supply controller. The switching power supply controller outputs a PWM wave to a half-bridge driver according to a processor control signal. The half-bridge driver converts the received PWM wave into two complementary driving PWM waves and outputs them to the gates of a third MOSFET and a fourth MOSFET respectively. The third MOSFET and the fourth MOSFET are connected in series. The drain of the third MOSFET is the power input terminal. The fourth MOSFET is connected in parallel with an LC filter circuit. The output terminal of the LC filter circuit is the output terminal of the current source. A current sampling circuit is further provided at the output terminal of the current source. The current sampling circuit feeds back the sampled current to the processor.

[0013] Further, the thyristor switch circuit includes a unidirectional thyristor unit. The positive terminal of the unidirectional thyristor unit is connected to the voltage source, the negative terminal is connected to the current source, and the control terminal of the unidirectional thyristor unit is connected to the output of a control switch. The input terminal of the control switch is connected to a control power supply, and the control terminal of the control switch is connected to the processor to receive the processor control signal. When the control terminal of the unidirectional thyristor unit is at a low level, the thyristor is turned off. At this time, the unidirectional thyristor unit is not conducting, and the voltage source and the current source are independently output. When the control terminal of the unidirectional thyristor unit is at a high level, it is turned on, and the voltage source and the current source are output in parallel.

[0014] Further, the control power supply is a 12V power supply; the control switch is an NPN transistor. When the control signal of the processor is at a low level, the control switch is turned off. Thus, the unidirectional thyristor unit is turned off; conversely, when the control signal of the processor is at a high level, the NPN transistor conducts, and the unidirectional thyristor unit conducts.

[0015] Further, the power supply further includes a communication module. The communication module transmits the collected current and voltage information to a remote server.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting a controllable parallel circuit of voltage source and current source, when powering a load that requires high current supply, a multi-stage parallel power supply mode is adopted, and the output power of any one of them can be arbitrarily controlled. Separate output interfaces are left for each path of the parallel voltage source and current source. When needed, any path of voltage source and current source can be incorporated into the total output port by controlling the thyristor switch circuit to increase the power output, or the parallel branch strips of the total output port can be disconnected to reduce the power output. At the same time, the output current of any path in the parallel circuit of the total output port can be programmed and output in any proportion. In addition, the present invention transmits the real-time data of the device back to the cloud for digital intelligent monitoring, realizing power monitoring of the electrical equipment and far exceeding safety monitoring, thus making up for the shortcoming that the traditional non-isolated power supply cannot protect the safety of the subsequent electrical equipment when a circuit failure occurs, and can realize functions such as equipment damage protection, over-current self-recovery, and fault alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural block diagram of a specific embodiment of the present invention.

[0018] Figure 2 It is a structural block diagram of another specific embodiment of the present invention.

[0019] Figure 3 、 Figure 4 It is a specific embodiment of the voltage source circuit diagram in the present invention.

[0020] Figure 5 The complementary PWM wave diagram output by IR2104 in the embodiment of the present invention.

[0021] Figure 6 、 Figure 7 It is a specific embodiment of the current source in the present invention.

[0022] Figure 8 It is the circuit diagram of the thyristor switch circuit in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. Any technology implemented based on the content of the present invention belongs to the scope of the present invention.

[0024] Embodiment 1: As Figure 1 、 Figure 3 、 Figure 4 、 Figure 3 、 Figure 6 、 Figure 7 、 Figure 8As shown in the figure, this embodiment provides a parallel high-power power supply, which includes a voltage source and a current source connected in parallel. The control terminals of the voltage source and the current source are both connected to the processor and receive control signals from the processor. Specifically, the voltage source receives a reference DA voltage from the processor and outputs a specified voltage based on this reference DA voltage. The output terminals of the voltage source and the current source are both connected to both ends of the thyristor switch circuit.

[0025] As Figure 3 , Figure 4 shown in the figure, the voltage source adopts a BUCK synchronous buck architecture, including a switching power supply controller. The switching power supply controller outputs a PWM wave to the half-bridge driver according to the processor control signal. The half-bridge driver converts the received PWM wave into two complementary driving PWM waves and outputs them to the gates of the first MOSFET Q1 and the second MOSFET Q2 respectively. The first MOSFET Q1 and the second MOSFET Q2 are connected in series. The drain of the first MOSFET Q1 is the power input terminal. The second MOSFET Q2 is connected in parallel with an LC filter circuit. The output terminal of the LC filter circuit is the output terminal of the voltage source; a voltage sampling circuit is also provided at the output terminal of the voltage source. The voltage sampling circuit feeds back the sampled voltage to the switching power supply controller.

[0026] In this embodiment, the switching power supply controller uses TL494P. Its pin 16 receives the sampled voltage OUT1 fed back from the voltage sampling circuit. Pins 9 and 10 output a PWM wave in parallel. Pin 3 controls the duty cycle of the output PWM wave based on the comparison result between the sampled voltage and the reference DAV voltage. Similarly, in this embodiment, the half-bridge driver uses IR2104. The pin 2 of IR2104 is the input terminal, receives the PWM wave output from the switching power supply controller, and outputs complementary PWM waves from pins 7 and 5. IR2104 has a built-in output shutdown function. The output state is controlled by controlling the level of pin 3. When pin 3 is connected to a high level (VCC), the output is turned on. When connected to a low level (GND), the output is turned off. This function can be used for circuit protection. In addition, as Figure 3As shown, the IR2104 outputs complementary PWM with a built-in dead zone. The existence of the dead zone prevents the simultaneous conduction of the first MOSFET and the second MOSFET, which could cause a short circuit or heat loss in the circuit, and can greatly improve the efficiency of the switching power supply. The voltage sampling circuit can use the INA282. It should be noted that in order to prevent the sampled voltage from exceeding the processing range of the processor, a voltage divider circuit can be set to sample the output voltage, and the sampled voltage is fed back to the switching power supply controller and the processor. The processor gives the DAV value corresponding to the value of the voltage at which the circuit needs to stably output according to the current output voltage, and sends this DAV value to the inverting terminal of the switching power supply controller TL494. The voltage source output is regulated by the DAV value, and the DAV value is continuously adjusted by continuously judging whether the output value is the set value. Until the output is stable at the set value, the constant voltage source is realized in this way.

[0027] Similarly, as Figure 6 , Figure 7 shown, the current source includes a switching power supply controller ( Figure 6 , Figure 7 not shown in the figure), and the switching power supply controller outputs a PWM wave to the half-bridge driver according to the processor control signal. The half-bridge driver converts the received PWM wave into two complementary driving PWM waves and outputs them to the gates of the third MOSFET Q3 and the fourth MOSFET Q4 respectively. The source of the third MOSFET Q3 and the fourth MOSFET Q4 are connected in series, and the fourth MOSFET Q4 is connected in parallel with an LC filter circuit. The output terminal of the LC filter circuit is the output terminal of the current source. A current sampling circuit is also provided at the output terminal of the current source, and the current sampling circuit feeds back the sampled current IOUT1 to the processor. The key for the current source to become a constant current source lies in sampling the output current IOUT2 and stabilizing the current by changing the output voltage of the current source. For example, when preparing to output a constant current of 20A and the load is 1 ohm, the output voltage needs to be controlled to 20V. If the load suddenly changes from 1 ohm to 5 ohms, the circuit current will immediately change to 4A. This change will be immediately transmitted back to the processor (CPU) through the INA282 in the current sampling circuit. When the CPU detects that the output current decreases, it will immediately control the switching power supply controller to increase the duty cycle of the PWM logic signal it outputs until the output voltage can stabilize the current at 20A under the current load, realizing a constant output current of the current source.

[0028] As Figure 8As shown in the figure, in this embodiment, the thyristor switch circuit includes a unidirectional thyristor unit QX1. The positive terminal of the unidirectional thyristor unit QX1 is connected to the voltage source, the negative terminal is connected to the current source, and the control terminal of the unidirectional thyristor unit QX1 is connected to the output of the control switch Q5. The input terminal of the control switch Q5 is connected to the control power supply VCC, and the control terminal of the control switch Q5 is connected to the processor to receive the control signal of the processor. When the control terminal of the unidirectional thyristor unit QX1 is at a low level, the thyristor unit QX1 is turned off. At this time, the unidirectional thyristor unit QX1 is not conducting, and the voltage source and the current source are independently output. When the control terminal of the unidirectional thyristor unit QX1 is at a high level, it is turned on, and the voltage source and the current source are output in parallel. In this embodiment, the control power supply is a 12V power supply, which is realized by a full-bridge rectifier AC-DC conversion circuit; the control switch Q5 is an NPN transistor. When the control signal DA of the processor is at a low level, the control switch Q5 is turned off, so that the unidirectional thyristor unit QX1 is turned off; conversely, when the control signal DA of the processor is at a high level, the NPN transistor QX1 is turned on, and the unidirectional thyristor unit QX1 is turned on.

[0029] The power supply further includes a communication module, and the communication module transmits the collected current and voltage information to the remote server. In this embodiment, the communication module is a WIFI module. In practice, any wireless communication module such as Bluetooth, zigbee, 4G, 5G, GPRS can be used. In the present invention, the real-time data of the processor (CPU) is first stored in the external Flash by WIFI, and then uploaded to the cloud or the upper computer for device safety monitoring.

[0030] Embodiment 2: As Figure 2 shown, the difference from Embodiment 1 is that the parallel high-power power supply provided in this embodiment includes a voltage source connected in parallel and four current sources (the first current source, the second current source, the third current source, the fourth current source). The control terminals of the voltage source and the four current sources are all connected to the processor and receive control signals from the processor. The voltage source is connected to the positive terminal of the unidirectional thyristor unit in the first thyristor switch circuit, and the output terminal of the first current source is connected to the negative terminal of the unidirectional thyristor unit in the first thyristor switch circuit; at the same time, the second current source, the third current source, and the fourth current source are respectively connected to the negative terminal of the unidirectional thyristor unit in the first thyristor switch circuit through the second thyristor switch circuit, the third thyristor switch circuit, and the fourth thyristor switch circuit. The second thyristor switch circuit, the third thyristor switch circuit, and the fourth thyristor switch circuit all have the circuit structure as Figure 8 shown, that is, it includes a unidirectional thyristor unit, and Figure 8The difference in the middle structure is that the positive terminals of the thyristor units in the second thyristor switch circuit, the third thyristor switch circuit, and the fourth thyristor switch circuit are connected to the negative terminal of the thyristor unit in the first thyristor switch circuit, and the negative terminals of the thyristor units in the second thyristor switch circuit, the third thyristor switch circuit, and the fourth thyristor switch circuit are respectively connected to the second current source, the third current source, and the fourth current source. It should be noted that Figure 2 The connection relationships between the second thyristor switch circuit, the third thyristor switch circuit, the fourth thyristor switch circuit, the first current source, the second current source, the third current source, the fourth current source and the processor are not shown in []. However, the control principles of each thyristor switch circuit (the first thyristor switch circuit, the second thyristor switch circuit, the third thyristor switch circuit, the fourth thyristor switch circuit) and each current source (the first current source, the second current source, the third current source, the fourth current source) are exactly the same as the control methods of the thyristor switch circuit and the current source in Embodiment 1.

[0031] In solving the protection of the non-isolated power supply, the present invention adopts dual protection control, and the safety level is divided into two levels. The first level is overcurrent self-recovery: after the circuit output current is set, the CUP will use the set value as the safety threshold and monitor the surge or other forms of instantaneous current increase in the circuit. Once the current exceeds the threshold, the CPU will immediately reduce the voltage output, then detect the output current, perform impedance calculation, calculate the current impedance, simulate the voltage after the impedance current of the output, and compare it with the threshold current; if this simulated current is still greater than the threshold, the fault level is the second level. It is necessary to turn off the total output port of the control signal, and at the same time turn off the output of the half-bridge driver IR2104 in the voltage source and / or current source. If this simulated current is less than the threshold, it means that this current is the instantaneous surge current of the circuit or the instantaneous current caused by unstable factor interference, and the protection takes effect, and the output is immediately restarted. The setting of the circuit output is completed by the CPU reading the external input instruction. In some embodiments, the processor uses STM32, which has a fast operation speed, and all the involved adjustments, protections, and instructions can be completed within milliseconds.

Claims

1. A parallel-connected high-power power supply, characterized in that, It includes a voltage source and at least one current source connected in parallel; The control terminals of the voltage source and the current source are simultaneously connected to the processor and receive control signals from the processor; The output terminals of the voltage source and the current source are simultaneously connected to both ends of a thyristor switch circuit; where The voltage source adopts a BUCK synchronous buck architecture and includes a switch power controller. The switch power controller uses TL494P. Its pin 16 receives the sampled voltage fed back from a voltage sampling circuit. Pins 9 and 10 are connected in parallel to output PWM waves. Pin 3 controls the duty cycle of the output PWM wave based on the comparison result between the sampled voltage and the reference DAV voltage. The voltage sampling circuit sets up a voltage division circuit to sample the output voltage and feeds the sampled voltage back to the switch power controller and the processor; The processor gives the reference DAV voltage corresponding to the value of the voltage required for the circuit to stably output according to the current output voltage, and sends this reference DAV voltage to the switch power controller TL494 to regulate the output of the voltage source. By continuously judging whether the output value is the set value, the reference DAV voltage is continuously adjusted until the output is stable at the set value; The current source includes a switch power controller. After sampling the output current, the current source stabilizes the current by changing the output voltage of the current source.

2. The power supply according to claim 1, wherein The switch power controller outputs a PWM wave to a half-bridge driver according to the processor control signal. The half-bridge driver converts the received PWM wave into two complementary driving PWM waves and outputs them to the gates of the first MOSFET and the second MOSFET respectively. The first MOSFET and the second MOSFET are connected in series. The drain of the first MOSFET is the power input terminal. The second MOSFET is connected in parallel with an LC filter circuit. The output terminal of the LC filter circuit is the output terminal of the voltage source; The voltage sampling circuit is also provided at the output terminal of the voltage source. The voltage sampling circuit feeds the sampled voltage back to the switch power controller and the processor.

3. The power supply according to claim 1, characterized in that, The switch power controller outputs a PWM wave to a half-bridge driver according to the processor control signal. The half-bridge driver converts the received PWM wave into two complementary driving PWM waves and outputs them to the gates of the third MOSFET and the fourth MOSFET respectively. The third MOSFET and the fourth MOSFET are connected in series. The drain of the third MOSFET is the power input terminal. The fourth MOSFET is connected in parallel with an LC filter circuit. The output terminal of this LC filter circuit is the output terminal of the current source; A current sampling circuit is also provided at the output terminal of the current source. The current sampling circuit feeds the sampled current back to the processor.

4. The power supply according to claim 1, characterized in that, The thyristor switch circuit includes a unidirectional thyristor unit. The positive end of the unidirectional thyristor unit is connected to the voltage source, the negative end is connected to the current source, the control terminal of the unidirectional thyristor unit is connected to the output of a control switch, the input terminal of the control switch is connected to a control power supply, and the control terminal of the control switch is connected to the processor to receive the control signal of the processor.

5. The power supply according to claim 4, characterized in that, The control power supply is a 12V power supply; the control switch is an NPN triode.

6. The power supply according to claim 1, wherein The power supply further includes a communication module, and the communication module transmits the collected current and voltage information to a remote server.

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