CN115347539A - Current limiting circuit for power supply device - Google Patents
Current limiting circuit for power supply device Download PDFInfo
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- CN115347539A CN115347539A CN202110524359.9A CN202110524359A CN115347539A CN 115347539 A CN115347539 A CN 115347539A CN 202110524359 A CN202110524359 A CN 202110524359A CN 115347539 A CN115347539 A CN 115347539A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
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Abstract
The invention relates to a current-limiting circuit for a power supply device, which comprises a first phase-reversing module, a second phase-reversing module, a first comparison module, a second comparison module and a frequency control module, wherein the power supply device executes current sampling and converts the current sampling into voltage, and the first phase-reversing module executes voltage sampling on the power supply device and generates first phase-reversing voltage; the second inverting module generates a second inverting voltage according to the first inverting voltage; the first comparison module and the second comparison module execute voltage comparison, when the first reversed-phase voltage is greater than the first comparison voltage, the first comparison module outputs a first warning signal, and when the second reversed-phase voltage is greater than the second comparison voltage, the second comparison module outputs a second warning signal; the frequency control module generates a first current limiting signal according to the first warning signal, or generates a second current limiting signal according to the second warning signal, and controls the power supply device to operate according to the first current limiting signal or the second current limiting signal.
Description
Technical Field
A current limiting circuit, and more particularly, to a current limiting circuit for a power supply device.
Background
Power supplies, inverters … and other power supply devices capable of performing ac-dc conversion are used to provide stable power for electronic devices, and as electronic products are widely popularized, the fineness and performance of electronic devices are gradually improved, and when the output current of a power supply device connected to an electronic device is too large, internal devices of the electronic device are easily damaged, which causes a failure of the electronic device, and therefore the output current of the power supply device needs to be monitored and controlled to protect the electronic device at the rear end of the power supply device.
In order to prevent the influence of the excessive output current on the connected electronic equipment, the output current of the power supply device is generally controlled by a current limiting circuit, the current limiting circuit detects an output current value of the power supply device, and when the output current value is excessive, the current limiting circuit turns off the power supply output of the power supply device by turning off each control switch in the power supply device, so as to immediately prevent the influence of the excessive output current on the electronic equipment.
However, although the power output of the power device is turned off to prevent the excessive output current from damaging the rear-end electronic device, the electronic device is prone to fail to operate due to the loss of the input power, which affects the operating efficiency of the electronic device.
Disclosure of Invention
In view of the above, the present invention provides a current limiting circuit for a power device, which reduces an output current value of the power device and maintains a power output of the power device while limiting the current, so as to solve the problem that the conventional current limiting circuit turns off the output power of the power device during current limiting, which results in the failure of an electronic device.
In order to achieve the foregoing, the current limiting circuit for a power supply apparatus of the present invention is applied to a power supply apparatus, and the power supply apparatus includes a control circuit and an output switch module, and the control circuit outputs a control signal to control the operation of the output switch module, the current limiting circuit of the power supply apparatus includes:
the first inverting module is provided with an input end and an output end, the input end of the first inverting module is electrically connected with the power supply device, and the first inverting module samples a corresponding sampling voltage according to an output current value of the power supply device and carries out voltage conversion and inverting processing on the sampling voltage to generate a first inverting voltage;
the second inverting module is provided with an input end and an output end, the input end of the second inverting module is electrically connected with the output end of the first inverting module, and when the second inverting module receives the first inverting voltage, the first inverting voltage is subjected to voltage conversion and inverting processing to generate second inverting voltage;
the first comparison module is provided with an input end and an output end, the input end of the first comparison module is electrically connected with the output end of the first inverting module so as to receive the first inverting voltage, the first inverting voltage is compared with a preset first comparison voltage, and when the first inverting voltage is greater than the first comparison voltage, the output end of the first comparison module outputs a first warning signal;
a second comparison module having an input terminal and an output terminal, wherein the input terminal of the second comparison module is electrically connected to the output terminal of the second inversion module to receive the second inversion voltage, and compare the second inversion voltage with a preset second comparison voltage, and when the second inversion voltage is greater than the second comparison voltage, the output terminal of the second comparison module outputs a second warning signal;
a frequency control module electrically connected to the output terminal of the first comparison module and the output terminal of the second comparison module;
when the frequency control module receives the first warning signal, a first current limiting signal is generated and output to the power supply device, and the power supply device controls the operation of the output switch module according to the first current limiting signal;
when the frequency control module receives the second warning signal, a second current-limiting signal is generated and output to the power supply device, and the power supply device controls the operation of the output switch module according to the second current-limiting signal.
The invention judges whether the output current of the positive phase and the output current of the negative phase are overlarge to need current limiting through the comparison of the first reversed phase voltage, the second reversed phase voltage and the first comparison voltage and the second comparison voltage, and controls the output switch Guan Mozu of the power supply device to operate through the first current limiting signal or the second current limiting signal when the current limiting is needed, thereby achieving the purpose of current limiting of the output power supply of the power supply device, preventing the rear-end electronic equipment from being damaged due to overlarge current, maintaining the power supply output of the power supply device, and further ensuring the continuous operation of the rear-end electronic equipment.
Drawings
Fig. 1 is a block diagram of a current limiting circuit for a power supply apparatus according to the present invention.
Fig. 2 is a circuit diagram of a current limiting circuit for a power supply apparatus according to the present invention.
FIG. 3 is a waveform diagram illustrating the operation of the switch module controlled by the control signal according to the present invention.
FIG. 4 is a waveform diagram illustrating the operation of the switch module controlled by the second current-limiting signal according to the present invention.
FIG. 5 is a waveform diagram illustrating the operation of the switch module controlled by the first current-limiting signal according to the present invention.
Detailed Description
The technical means adopted by the invention to achieve the predetermined object of the invention are further described below with reference to the drawings and the preferred embodiments of the invention.
Referring to fig. 1, the present invention is a current limiting circuit 1 for a power device, which is used for a power device 100, the power device 100 includes a control loop 110 and an output switch module 120, the control loop 110 outputs a control signal to control the operation of the output switch module 120, the power device 100 performs current sampling and voltage conversion, and the power device 100 can be an electronic device related to ac/dc conversion and power supply, such as a power supply, an inverter …, etc., the current limiting circuit 1 for a power device includes a first inverter module 10, a second inverter module 20, a first comparison module 30, a second comparison module 40, and a frequency control module 50.
The first inverting module 10 has an input terminal and an output terminal, the input terminal of the first inverting module 10 is electrically connected to the power supply device 100 to sample a corresponding sampling voltage according to an output current value of the power supply device 100, and perform voltage amplification and inverting processing on the sampling voltage to generate and output a first inverting voltage. The second inverting module 20 has an input terminal and an output terminal, the input terminal of the second inverting module 20 is electrically connected to the output terminal of the first inverting module 10, and when the second inverting module 20 receives the first inverting voltage, the first inverting voltage is amplified and inverted to generate and output a second inverting voltage.
The first comparing module 30 has an input terminal and an output terminal, the input terminal of the first comparing module 30 is electrically connected to the output terminal of the first inverting module 10, and an adjustable first comparing voltage is preset in the first comparing module 30, when the first comparing module 30 receives the first inverting voltage, the first comparing module 30 compares the first inverting voltage with the first comparing voltage, and when the first inverting voltage is greater than the first comparing voltage, the first comparing module 30 outputs a first warning signal.
The second comparing module 40 has an input terminal and an output terminal, the input terminal of the second comparing module 40 is electrically connected to the output terminal of the second inverting module 20, and an adjustable second comparing voltage is preset in the second comparing module 40, when the second comparing module 40 receives the second inverting voltage, the second comparing module 40 compares the second inverting voltage with the second comparing voltage, and when the second inverting voltage is greater than the second comparing voltage, the second comparing module 40 outputs a second warning signal.
The frequency control module 50 has an input end and an output end, the input end of the frequency control module 50 is electrically connected to the output ends of the first and second comparing modules 30 and 40, the output end of the frequency control module 50 is electrically connected to the power supply apparatus 100, the frequency control module 50 receives the first warning signal output by the first comparing module 30 and the second warning signal output by the second comparing module 40, the frequency control module 50 generates a first current limiting signal according to the first warning signal or generates a second current limiting signal according to the second warning signal, and the frequency control module 50 can adjust the frequency of the first current limiting signal or the second current limiting signal according to an adjustable preset current limiting clock, and further adjust the duty cycle (duty cycle) of the first current limiting signal and the second current limiting signal, for example, reduce the duty cycle of the first current limiting signal and the second current limiting signal, and output the first current limiting signal and the second current limiting signal to the power supply apparatus 100, the power supply apparatus 100 outputs the first current limiting signal or the second current limiting signal as the first current limiting signal or the second current limiting signal, wherein the duty cycle and the second current limiting signal are controlled by the first current limiting signal or the second current limiting signal, and the PWM signal is not required to modulate the duty cycle, and the second current limiting signal is smaller than the PWM signal.
When the power supply apparatus 100 does not receive the first current-limiting signal and the second current-limiting signal, that is, the first inverse voltage is not greater than the first comparison voltage, and the second inverse voltage is not greater than the second comparison voltage, the power supply apparatus 100 controls the on/off of each switch in the output switch module 120 by a control signal output by the control loop 110, so as to control the output power of the power supply apparatus 100; when the first inverse voltage is greater than the first comparison voltage, the current limiting circuit outputs the first current limiting signal to the power supply device 100, the output switch module 120 is controlled by the first current limiting signal to operate, and the first current limiting signal can reduce the on-time of each switch in the output switch module 120 because the duty ratio of the first current limiting signal is smaller than the control signal, thereby reducing the output current value of the output power supply of the power supply device 100; similarly, when the second inverse voltage is greater than the second comparison voltage, the current limiting circuit outputs the second current limiting signal to the power device 100, and the output switch module 120 is controlled by the second current limiting signal, and since the duty cycle of the second current limiting signal is smaller than the control signal, the second current limiting signal can reduce the on-time of each switch in the output switch module 120, and further reduce the output current value of the output power of the power device 100, thereby achieving the purpose of limiting the current of the power device 100.
Referring to fig. 2, a detailed circuit structure of the current limiting circuit 1 for a power supply apparatus according to the present invention is described below. The current limiting circuit is connected between a power input terminal and a power output terminal of the power device 100, and in this embodiment, the output switch module 120 of the power device 100 includes a first switch 121, a second switch 122, a third switch 123 and a fourth switch 124, and the control signal outputted by the control circuit 110 controls the first switch 121, the second switch 122, the third switch 123 and the fourth switch 124 to operate, wherein the first switch 121, the second switch 122, the third switch 123 and the fourth switch 124 may be mosfet switches.
The first inverting module 10 may be composed of a first inverting amplifier 11, a negative input terminal of the first inverting amplifier 11 is electrically connected to a current sampling and voltage converting output terminal of the power supply apparatus 100, and a positive input terminal of the first inverting amplifier 11 is grounded.
The second inverting module 20 may be composed of a second inverting amplifier 21, the negative input terminal of the second inverting amplifier 21 is electrically connected to the output terminal of the first inverting amplifier 11, and the positive input terminal of the second inverting amplifier 21 is grounded.
The first comparing module 30 can be composed of a first amplifier 31 and a first comparing power source 32, a negative input terminal of the first amplifier 31 is electrically connected to the output terminal of the first inverting amplifier 11, a positive input terminal of the first amplifier 31 is electrically connected to the first comparing power source 32, the first comparing module 30 uses the output voltage of the first comparing power source 32 as the first comparing voltage, and the first comparing module 30 can adjust the first comparing voltage by changing the output voltage of the first comparing power source 32, when the first amplifier 31 determines that the first inverting voltage is greater than the first comparing voltage, the first amplifier 31 outputs the first warning signal.
The second comparing module 40 can be composed of a second amplifier 41 and a second comparing power supply 42, the negative input terminal of the second amplifier 41 is electrically connected to the output terminal of the second inverting amplifier 21, the positive input terminal of the second amplifier 41 is electrically connected to the second comparing power supply 42, the second comparing module 40 uses the output voltage of the second comparing power supply 42 as the second comparing voltage, and the second comparing module 40 can adjust the second comparing voltage by changing the output voltage of the second comparing power supply 42, when the second amplifier 41 determines that the second inverting voltage is greater than the second comparing voltage, the second amplifier 41 outputs the second warning signal.
The frequency control module 50 includes a first Flip-Flop 51, a second Flip-Flop 52 and a clock generator 53, an input terminal of the first Flip-Flop 51 is electrically connected to an output terminal of the first amplifier 31, an output terminal of the first Flip-Flop 51 is electrically connected to the output switch module 120 of the power supply apparatus 100, an input terminal of the second Flip-Flop 52 is connected to an output terminal of the second amplifier 41, an output terminal of the second Flip-Flop 52 is electrically connected to the output switch module 120 of the ac-dc converter, and the clock generator 53 is connected to clock input terminals of the first Flip-Flop 51 and the second Flip-Flop 52, wherein the first Flip-Flop 51 and the second Flip-Flop 52 may be D Flip-flops (D Flip-flops), and the first Flip-Flop 51 and the second Flip-Flop 52 use an output clock of the clock generator 53 as the preset current-limited clock, the frequency control module 50 may change an output clock of the clock generator 53 to adjust the preset current-limited clock, and generate the first clock signal and the first current-limited clock signal according to the first Flip-limited clock signal and the first clock signal when the first Flip-limited clock signal is received from the first Flip-Flop 51 and the second Flip-limited clock signal; similarly, when the second flip-flop 52 receives the second warning signal from the second amplifier 41, the second flip-flop 52 generates the second current-limiting signal, and adjusts the frequency and duty cycle of the second current-limiting signal according to the clock of the clock generator 53.
Further, a logic control module 60 may be disposed between the frequency control module 50 and the control loop 110 and the output switch module 120, the logic control module 60 has an input end and an output end, the input end of the logic control module 60 is connected to the control loop 110 and the frequency control module 50, the output end of the logic control module 60 is connected to the output switch module 120 of the power device 100, the logic control module 60 includes a logic circuit, one input end of the logic circuit is connected to the control loop 110, the other input end of the logic circuit is connected to the first trigger 51 or the second trigger 52, the output end of the logic circuit is connected to the first switch 121, the second switch 122, the third switch 123 or the fourth switch 124 in the output switch module 120, the logic circuit may perform a logic operation according to the value of the control signal output by the control loop 110, the value of the first current limiting signal output by the first trigger 51 or the value of the second current limiting signal output by the second trigger 52, and the logic operation result according to the first current limiting signal 122, the second current limiting signal 124 or the second current limiting signal 124.
In the present embodiment, the logic circuit includes a first inverse AND gate 61 (NAND), a second inverse AND gate 62 (NAND), a third inverse AND gate 63 (NAND), a fourth inverse AND gate 64 (NAND), a first AND gate 65 (AND), a second AND gate 66 (AND), AND a plurality of buffer gates 67 (BUF), but the type AND combination of the plurality of logic gates are not limited to the present embodiment. Wherein, the input end of the first inverse and gate 61 is electrically connected to the output ends of the control loop 110 and the second flip-flop 52; the input terminal of the second inverting and gate 62 is electrically connected to the output terminals of the control loop 110 and the second flip-flop 52; the input end of the third inverting and gate 63 is electrically connected to the output end of the first inverting and gate 61 and the output end of the first flip-flop 51, and the output end of the third inverting and gate 63 is electrically connected to the second switch 122 through a buffer gate 67 (BUF); the input end of the fourth inverse and gate 64 is electrically connected to the output end of the second inverse and gate 62 and the output end of the first flip-flop 51, and the output end of the fourth inverse and gate 64 is electrically connected to the fourth switch 124 through a buffer gate 67; the output terminal of the first and gate 65 is electrically connected to the output terminal of the first inverse and gate 61 and the output terminal of the first flip-flop 51, and the output terminal of the first and gate 65 is electrically connected to the first switch 121 through a buffer gate 67; the input terminal of the second and gate 66 is electrically connected to the output terminal of the second and gate 62 and the output terminal of the first flip-flop 51, and the output terminal of the second and gate 66 is electrically connected to the third switch 123 through a buffer gate 67.
Referring to fig. 3 to 5, the following describes a process of controlling the output switch module 120 by the first current-limiting signal and the second current-limiting signal according to the present invention with waveforms, wherein V1 corresponds to a signal waveform of the first switch 121, V2 corresponds to a signal waveform of the second switch 122, V3 corresponds to a signal waveform of the third switch 123, V4 corresponds to a signal waveform of the fourth switch 124, V5 corresponds to a waveform of an output signal of the control loop 110, V6 corresponds to a waveform of an output signal of the second flip-flop 52, and V7 corresponds to a waveform of an output signal of the first flip-flop 51. As shown in fig. 3, when the first inverse voltage is not greater than the first comparison voltage, the first amplifier 31 outputs a normal state signal through the first flip-flop 51, and when the second inverse voltage is not greater than the second comparison voltage, the second amplifier 41 outputs the normal state signal through the second flip-flop 52, in this embodiment, the normal state signal is a high level, that is, the normal state signal is 1, the control circuit 110 outputs the control signal, after the logic control module 60 performs logic operation on the normal state signals of the first flip-flop 51 and the second flip-flop 52 and the control signal output by the control circuit 110, the logic control module 60 outputs the control signal to the output switch module 120, and the control signal controls the first switch 121, the second switch 122, the third switch 123 and the fourth switch 124 to alternately operate.
As shown in fig. 4, when the second inverse voltage is greater than the second comparison voltage, it represents that the output current is too large when the power supply apparatus 100 is in positive phase, the control loop 110 outputs a control right replacing signal, and the first amplifier 31 outputs the normal state signal through the first flip-flop 51, in this embodiment, the control right replacing signal and the normal state signal are high levels, that is, the control right replacing signal and the normal state signal are 1, for example, after the logic control module 60 performs logic operation on the normal state signal output by the first flip-flop 51, the control right replacing signal output by the control loop 110, and the second current limiting signal output by the second flip-flop 52, the logic operation module outputs the second current limiting signal to the output switch module 120, controls the third switch 123 to be turned on and the fourth switch 124 to be turned off, and controls the first switch 121 and the second switch 122 to operate according to the second current limiting signal, so as to reduce the output current when the power supply apparatus 100 is in positive phase, thereby achieving current limiting when the power supply apparatus is in positive phase.
As shown in fig. 5, when the first inverse voltage is greater than the first comparison voltage, it represents that the output current of the power supply apparatus 100 is too large when the power supply apparatus 100 is in the negative phase, the control loop 110 outputs a control right replacing signal, and the second amplifier 41 outputs the normal state signal through the second flip-flop 52, in this embodiment, the control right replacing signal and the normal state signal are high levels, that is, the control right replacing signal and the normal state signal are 1 as an example, after the logic control module 60 performs logic operation on the normal state signal output by the second flip-flop 52, the control right replacing signal output by the control loop 110, and the first current limiting signal output by the first flip-flop 51, the logic operation module outputs the first current limiting signal to the output switch module 120, controls the first switch 121 to be turned off and the second switch 122 to be turned on, and controls the third switch 123 and the fourth switch 124 to operate according to the first current limiting signal, so as to reduce the output current limiting of the power supply apparatus 100 when the power supply apparatus is in the negative phase, thereby achieving current limiting at the negative phase.
In addition, the duty ratio of the output switch module 120 of the power device 100 during operation is reduced by the first current-limiting signal and the second current-limiting signal, the output current value of the power device 100 is reduced by reducing the on-time of each switch, and the power output of the power device 100 is maintained, so that the electronic device connected to the rear end of the power device 100 can continuously operate.
It should be noted that, in the embodiment, the normal state signal and the control right replacing signal are taken as high level for example, but the normal state signal and the control right alternating signal can also be taken as low level, which is not limited by the embodiment, and the settings of the logic control module 60 and the output switch module 120 can be changed according to the number and arrangement of logic gates and switches, which is not limited by the embodiment.
In summary, the current limiting circuit 1 for a power supply device of the present invention determines whether the output current in the positive phase and the output current in the negative phase are too large to limit the current through the first comparing module 30 and the second comparing module 40 according to the comparison between the first inverse voltage and the second inverse voltage and the first comparing voltage and the second comparing voltage, when the output current in the positive phase is too large, the second current limiting signal outputted by the frequency control module 50 controls the switching operation of the output switch module 120 in the positive phase, and since the duty ratio of the second current limiting signal is smaller than the control signal, the second current limiting signal can reduce the output current value of the output power when the power supply device 100 is in the positive phase, so as to limit the current of the power supply device 100 in the positive phase; similarly, when the output current of the negative phase is too large, the first current-limiting signal outputted by the frequency control module 50 controls the switching operation of the output switch module 120 in the negative phase, and since the duty ratio of the first current-limiting signal is smaller than the control signal, the first current-limiting signal can reduce the output current value of the output power of the power supply device 100 when the power supply device 100 is in the negative phase, and perform negative phase current limiting on the power supply device 100, therefore, the present invention can control the operation of the output switch module 120 of the power supply device 100 through the first current-limiting signal or the second current-limiting signal when the output current value is in the positive phase or the negative phase, so as to achieve the purpose of current limiting on the output power of the power supply device 100, prevent the rear-end electronic device from being damaged due to the too high output current, and further improve the problem that the operation of the rear-end electronic device is stopped due to the direct stopping of the power supply output of the power supply device 100 in the prior art, and the operation of the electronic device is affected.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (10)
1. A current limiting circuit for a power supply device, wherein the power supply device comprises a control circuit and an output switch module, and the control circuit outputs a control signal to control the operation of the output switch module, the current limiting circuit for the power supply device comprises:
the first inverting module is provided with an input end and an output end, the input end of the first inverting module is electrically connected with the power supply device, and the first inverting module samples a corresponding sampling voltage according to an output current value of the power supply device and carries out voltage conversion and inverting processing on the sampling voltage to generate a first inverting voltage;
a second reverse phase module with an input end and an output end, wherein the input end of the second reverse phase module is electrically connected with the output end of the first reverse phase module, and when the second reverse phase module receives the first reverse phase voltage, the first reverse phase voltage is subjected to voltage conversion and reverse phase treatment to generate a second reverse phase voltage;
the first comparison module is provided with an input end and an output end, the input end of the first comparison module is electrically connected with the output end of the first inverting module so as to receive the first inverting voltage, the first inverting voltage is compared with a preset first comparison voltage, and when the first inverting voltage is greater than the first comparison voltage, the output end of the first comparison module outputs a first warning signal;
the second comparison module is provided with an input end and an output end, the input end of the second comparison module is electrically connected with the output end of the second reversed-phase module so as to receive the second reversed-phase voltage, the second reversed-phase voltage is compared with a preset second comparison voltage, and when the second reversed-phase voltage is greater than the second comparison voltage, the output end of the second comparison module outputs a second warning signal;
a frequency control module electrically connected to the output end of the first comparison module and the output end of the second comparison module;
when the frequency control module receives the first warning signal, a first current limiting signal is generated and output to the power supply device, and the power supply device controls the operation of the output switch module according to the first current limiting signal;
when the frequency control module receives the second warning signal, a second current-limiting signal is generated and output to the power supply device, and the power supply device controls the operation of the output switch module according to the second current-limiting signal.
2. The current-limiting circuit of claim 1, wherein the frequency control module adjusts the frequency and duty cycle of the first current-limiting signal and the second current-limiting signal according to a predetermined current-limiting clock, and the duty cycle of the first current-limiting signal and the second current-limiting signal is smaller than the duty cycle of the control signal.
3. The current-limiting circuit of claim 1, wherein when the first inverted voltage is not greater than the first comparison voltage and when the second inverted voltage is not greater than the second comparison voltage, the power device controls the operation of the output switch module according to the control signal output by the control loop;
when the first inverse voltage is larger than the first comparison voltage, the power supply device controls the output switch module to operate according to the first current-limiting signal;
when the second inverse voltage is larger than the second comparison voltage, the power supply device controls the output switch module to operate according to the second current-limiting signal.
4. The current-limiting circuit for a power supply device of claim 1, further comprising:
a logic control module electrically connected between the frequency control module and the control circuit and the output switch module, and including an input terminal, an output terminal and a logic circuit;
the input end of the logic control module is connected with the control loop and the frequency control module, and the output end of the logic control module is connected with the output switch module of the power supply device.
5. The current-limiting circuit of claim 4, wherein the first comparing module outputs a normal state signal via the frequency control module when the first inverted voltage is not greater than the first comparing voltage, and the second comparing module outputs the normal state signal via the frequency control module when the second inverted voltage is not greater than the second comparing voltage, the logic control module outputs the control signal after performing logic operation on each of the normal state signal and the control signal output by the control loop, and the power device controls the output switch module with the control signal;
when the second inverse voltage is larger than the second comparison voltage, the control loop outputs a control right replacing signal, the first comparison module outputs the normal state signal through the frequency control module, the logic control module carries out logic operation by the normal state signal, the control right replacing signal output by the control loop and the second current limiting signal, the logic operation module outputs the second current limiting signal for control, and the power supply device controls the output switch module by the second current limiting signal;
when the first inverse voltage is larger than the first comparison voltage, the control loop outputs the control right replacing signal, the second comparison module outputs the normal state signal through the frequency control module, the logic control module performs logic operation by the normal state signal, the control right replacing signal output by the control loop and the first current limiting signal, the logic operation module outputs the first current limiting signal, and the power supply device controls the output switch module by the first current limiting signal.
6. The current-limiting circuit for a power device of claim 1, wherein the first inverting module comprises a first inverting amplifier, a negative input terminal of the first inverting amplifier is electrically connected to the current-sampling-to-voltage output terminal of the power device, and a positive input terminal of the first inverting amplifier is grounded;
the second inverting module is composed of a second inverting amplifier, a negative input end of the second inverting amplifier is electrically connected with an output end of the first inverting amplifier, and a positive input end of the second inverting amplifier is grounded.
7. The current-limiting circuit for power devices of claim 1, wherein the first comparing module comprises a first amplifier and a first comparing power source, a negative input terminal of the first amplifier is electrically connected to the output terminal of the first inverting module, a positive input terminal of the first amplifier is electrically connected to the first comparing power source, and the first comparing power source outputs the first comparing voltage to the positive input terminal of the first amplifier;
the second comparison module is composed of a second amplifier and a second comparison power supply, a negative input end of the second amplifier is electrically connected with the output end of the second inverting module, a positive input end of the second amplifier is electrically connected with the second comparison power supply, and the second comparison power supply outputs the second comparison voltage to the positive input end of the second amplifier.
8. The current-limiting circuit of claim 1, wherein the frequency control module comprises a first flip-flop, a second flip-flop, and a clock generator, an input of the first flip-flop is electrically connected to the output of the first comparing module, an output of the first flip-flop is electrically connected to the output switch module of the power device, an input of the second flip-flop is connected to the second comparing module, an output of the second flip-flop is electrically connected to the output switch module of the power device, and the clock generator is connected to a clock input of the first flip-flop and a clock input of the second flip-flop.
9. The current-limiting circuit of claim 8, wherein the first and second flip-flops respectively use the output clock of the clock generator as a predetermined current-limiting clock, the first and second flip-flops respectively adjust the frequency and duty cycles of the first and second current-limiting signals according to the predetermined current-limiting clock, and the duty cycles of the first and second current-limiting signals are smaller than the duty cycle of the control signal.
10. The current-limiting circuit of claim 1, wherein the frequency control module controls the operation of the output switch module with the first current-limiting signal to reduce the output current value when the power device is in a negative phase, or controls the operation of the output switch module with the second current-limiting signal to reduce the output current value when the power device is in a positive phase.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110524359.9A CN115347539A (en) | 2021-05-13 | 2021-05-13 | Current limiting circuit for power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110524359.9A CN115347539A (en) | 2021-05-13 | 2021-05-13 | Current limiting circuit for power supply device |
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| CN115347539A true CN115347539A (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110524359.9A Pending CN115347539A (en) | 2021-05-13 | 2021-05-13 | Current limiting circuit for power supply device |
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| CN (1) | CN115347539A (en) |
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