CN211557132U - Switching power supply control circuit - Google Patents
Switching power supply control circuit Download PDFInfo
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- CN211557132U CN211557132U CN202020016843.1U CN202020016843U CN211557132U CN 211557132 U CN211557132 U CN 211557132U CN 202020016843 U CN202020016843 U CN 202020016843U CN 211557132 U CN211557132 U CN 211557132U
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Abstract
The utility model discloses a switching power supply control circuit, including power input end, the module of charging, the module of discharging, comparison module and control module. The charging module is used for charging under the power supply of the direct-current voltage provided by the power supply input end, generating output voltage which changes linearly along with charging time, and the waveform slope of the output voltage changes linearly along with the change of the direct-current voltage. The discharging module is used for periodically discharging the output voltage according to the control signal so as to process the waveform of the output voltage into a sawtooth waveform. The comparison module is used for comparing the output voltage processed by the discharge module with the reference voltage to output a rectangular wave signal corresponding to the duty ratio to the control module, so that the control module outputs a driving signal of the duty ratio required by the switching power supply. Therefore, the circuit design is effectively simplified, the power supply efficiency is improved, and the development cost is reduced.
Description
Technical Field
The utility model relates to a switching power supply control technical field especially relates to a switching power supply control circuit of IGBT driver.
Background
In a high-voltage inverter system, a switching power supply of an IGBT driver has requirements different from those of a low-voltage system, for example, the insulation performance of an original secondary side is generally required to be more than 4kVac, and as a coupling capacitor between the original secondary side is generally required to be less than 20 pF. As shown in FIG. 1, a BUCK power supply is added at the front stage to reduce and stabilize voltage, and then the output is isolated by a push-pull power supply, so that the wide-range input function is indirectly realized.
However, this design uses more electronic devices due to the increased BUCK or BOOST power supply, which not only reduces power supply efficiency and increases development cost, but also is not conducive to miniaturized design.
SUMMERY OF THE UTILITY MODEL
Therefore, there is a need for a switching power supply control circuit, which can realize wide-range input and voltage-stabilizing output of a switching power supply without adding an additional switching power supply, and at the same time, simplify the circuit design, improve the power supply efficiency, and reduce the development cost.
The utility model discloses a reach the technical scheme that above-mentioned purpose proposed as follows:
the utility model provides a switching power supply control circuit, includes power input end and control module, control module is used for sending first control signal, in order with the direct voltage that power input end provided converts the drive signal into corresponding duty cycle, switching power supply control circuit still includes:
the charging module is electrically connected with the power supply input end and used for charging under the power supply of the direct-current voltage and generating output voltage which linearly changes along with charging time, and the waveform slope of the output voltage linearly changes along with the change of the direct-current voltage;
the discharging module is electrically connected between the charging module and the control module and used for receiving the first control signal and periodically discharging the output voltage according to the first control signal so as to process the waveform of the output voltage generated by the output end of the charging module into a sawtooth waveform;
the comparison module is electrically connected between the charging module and the control module and used for comparing the output voltage processed by the discharging module with a reference voltage so as to output a rectangular wave signal corresponding to the duty ratio to the control module, and the control module outputs a driving signal corresponding to the duty ratio according to the first control signal and the rectangular wave signal.
Furthermore, the charging module comprises a voltage-controlled current source and a capacitor, one end of the voltage-controlled current source is electrically connected with the power input end, the other end of the voltage-controlled current source is electrically connected with one end of the capacitor, the other end of the capacitor is grounded, and the voltage-controlled current source is used for charging the capacitor.
Further, the discharging module includes an electronic switch, a first end of the electronic switch is electrically connected to the control module, a second end of the electronic switch is grounded, and a third end of the electronic switch is electrically connected between the voltage-controlled current source and the capacitor.
Furthermore, the electronic switch is an N-channel enhancement type field effect transistor, and the first end, the second end and the third end of the electronic switch respectively correspond to the gate, the source and the drain of the N-channel enhancement type field effect transistor.
Furthermore, the comparison module comprises a comparator, an inverting input end of the comparator is electrically connected between the voltage-controlled current source and the capacitor, and a non-inverting input end of the comparator is electrically connected with a reference voltage;
when the output voltage processed by the discharging module is smaller than the reference voltage, the rectangular wave signal output by the comparing module is at a high level;
and when the output voltage processed by the discharging module is greater than the reference voltage, the rectangular wave signal output by the comparing module is at a low level.
Furthermore, the control module comprises a pulse width modulation unit and a logic processing unit, one end of the logic processing unit is electrically connected with the pulse width modulation unit, the other end of the logic processing unit is electrically connected with the discharging module and the comparing module, the pulse width modulation unit is used for sending a second control signal to the logic processing unit, the logic processing unit is used for processing the second control signal and then outputting the first control signal to the discharging module, and is also used for receiving the rectangular wave signal output by the comparing module, the logic processing unit performs logic processing on the rectangular wave signal and the first control signal, and the pulse width modulation unit is used for correspondingly outputting a driving signal with a duty ratio required by the switching power supply according to the voltage signal.
Further, the logic processing unit includes a first and gate and a not gate, a first input end of the first and gate is electrically connected to an output end of the comparator, a second input end of the first and gate is electrically connected to an input end of the not gate, an output end of the first and gate is electrically connected to the pulse width modulation unit, an input end of the not gate is electrically connected to the pulse width modulation unit, and an output end of the not gate is electrically connected to a first end of the electronic switch.
Furthermore, the logic processing unit includes a second and gate, a third and gate and a nor gate, a first input end of the second and gate and a first input end of the third and gate are both electrically connected to the output end of the comparator, a second input end of the second and gate and a second input end of the third and gate are respectively connected to the first input end of the nor gate and the second input end of the nor gate in a one-to-one correspondence manner, and the output end of the nor gate is electrically connected to the first end of the electronic switch after being inverted.
Furthermore, the control module comprises a main control chip, and the main control chip is a complex programmable logic device.
The drive protection circuit generates output voltage which linearly changes along with charging time through the charging module, the waveform slope of the output voltage linearly changes along with the change of direct-current voltage provided by the power supply input end, the output voltage is periodically discharged through the discharging module so as to process the waveform of the output voltage into sawtooth waveform, the output voltage of the sawtooth waveform is compared with a reference voltage value through the comparing module so as to output a rectangular wave signal with corresponding duty ratio to the control module, and therefore the drive signal with the duty ratio required by the switching power supply is output. Therefore, the circuit design is greatly simplified, the development cost is reduced and the miniaturization design of the integrated circuit is facilitated while the wide-range input of the switching power supply and the voltage-stabilizing output of the switching power supply are realized.
Drawings
Fig. 1 is an exemplary connection diagram of a prior art switching power supply control circuit.
Fig. 2 is a block diagram of a preferred embodiment of a switching power supply control circuit.
Fig. 3 is a circuit diagram of a preferred embodiment of the switching power supply control circuit.
Fig. 4 is a block diagram of another embodiment of a switching power supply control circuit.
Fig. 5 is a circuit connection diagram of a preferred embodiment of the switching power supply control circuit in fig. 4.
Fig. 6 is another circuit diagram of a preferred embodiment of the switching power supply control circuit in fig. 4.
Fig. 7 is a signal level diagram illustrating the operation of the switching power supply control circuit of fig. 3.
Fig. 8 is another schematic diagram of signal levels of the switching power supply control circuit of fig. 3 in operation.
Fig. 9 is a signal level diagram illustrating the operation of the switching power supply control circuit of fig. 5.
Fig. 10 is a signal level diagram illustrating the operation of the switching power supply control circuit of fig. 6.
Description of the main elements
Switching power supply control circuit 100
Discharging module 30
Pulse width modulation unit 54
Power Vin, Vcc
Voltage controlled current source VCCS
Capacitor C
Electronic switch Q1
Comparator COMP
AND gate AND1, AND2, AND3
NOT gate U1
NOR gate NOR
The following detailed description of the invention will be further described in conjunction with the above-identified drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 2, the present invention provides a switching power supply control circuit 100 for outputting a driving signal of a duty ratio required by a switching power supply. The switching power supply control circuit 100 includes a power input terminal 10, a charging module 20, a discharging module 30, a comparing module 40, and a control module 50. In the present embodiment, the switching power supply control circuit 100 is applied to an IGBT driver.
The power input terminal 10 is electrically connected to the charging module 20. The discharging module 30 is electrically connected between the charging module 20 and the control module 50. The comparison module 40 is electrically connected between the charging module 20 and the control module 50.
The power input terminal 10 is used for providing a dc voltage for the charging module 20. The charging module 20 is configured to charge under the power supply of the dc voltage, and during a charging process (before charging is not saturated), an output end of the charging module 20 generates an output voltage that linearly changes with a charging time, and a waveform slope of the output voltage linearly changes with a change of the dc voltage. In the present embodiment, during charging (before charging is not saturated), the output voltage increases linearly with an increase in charging time, and the waveform slope of the output voltage increases linearly with an increase in the dc voltage.
The discharging module 30 is configured to receive a first control signal sent by the control module 50, and periodically discharge the output voltage according to the first control signal, so as to process a waveform of the output voltage generated at the output end of the charging module 20 into a sawtooth waveform. In this embodiment, the first control signal is a level signal.
The comparing module 40 is configured to receive the output voltage processed by the discharging module 30, and compare the output voltage processed by the discharging module 30 with a reference voltage to output a rectangular wave signal with a certain duty ratio to the control module 50. Specifically, when the output voltage processed by the discharging module 30 is smaller than the reference voltage, the rectangular wave signal output by the comparing module 40 is at a high level; when the output voltage processed by the discharging module 30 is greater than the reference voltage, the rectangular wave signal output by the comparing module 40 is at a low level.
The control module 50 is configured to send a first control signal to the discharging module 30, and is further configured to receive the rectangular wave signal output by the comparing module 40, and output a driving signal of a duty ratio required by the switching power supply according to the first control signal and the rectangular wave signal, so as to implement voltage-stabilized output of the switching power supply. In this embodiment, the control module 50 includes a main control chip (not shown), and the duty ratio of the driving signal can be determined by detecting the falling edges of the first control signal and the rectangular wave signal. The main control chip may be a Complex Programmable Logic Device (CPLD).
In this way, only different dc voltages need to be input to the power input terminal 10, the comparison circuit 40 receives the output voltages of the sawtooth waveforms with different slopes and correspondingly generates rectangular wave signals with different duty ratios, so that the control module 50 determines the duty ratios of the driving signals. Therefore, under the condition of not increasing an additional power supply, the wide-range input and the voltage stabilization output of the switching power supply can be realized, the circuit design is greatly simplified, the power supply efficiency is improved, the development cost is reduced, and the miniaturization design is facilitated.
Referring to fig. 3, fig. 3 is a circuit diagram of a preferred embodiment of the present invention. In this embodiment, the power input terminal 10 includes a power source Vin. The charging module 20 includes a voltage-controlled current source VCCS and a capacitor C. One end of the voltage-controlled current source VCCS is electrically connected to the power Vin, the other end of the voltage-controlled current source VCCS is electrically connected to one end of the capacitor C, and the other end of the capacitor C is grounded. A node P is located between the voltage-controlled current source VCCS and the capacitor C, the node P is an output end of the charging module 20, and an output voltage is Vc.
The discharging module 30 includes an electronic switch Q1, a first terminal of the electronic switch Q1 is electrically connected to the control module 50, a second terminal of the electronic switch Q1 is grounded, and a third terminal of the electronic switch Q1 is electrically connected to the node P. In this embodiment, the electronic switch Q1 may be an N-channel enhancement mode fet, and the first terminal, the second terminal and the third terminal of the electronic switch Q1 correspond to the gate, the source and the drain of the N-channel enhancement mode fet, respectively.
The comparing module 40 includes a comparator COMP, an inverting input terminal of the comparator COMP is electrically connected to the node P, a non-inverting input terminal of the comparator COMP is electrically connected to a reference voltage Vref, a power supply terminal of the comparator COMP is connected to a power supply Vcc, and a ground terminal of the comparator COMP is grounded. In this embodiment, the power source Vcc is powered by a logic power source, the specific magnitude of which is associated with the control module 50.
In operation, when the first control signal K1 is at a low level, the electronic switch Q1 is turned off, the voltage-controlled current source VCCS charges the capacitor C, the charging current is Ic, and the relationship between the charging current Ic and the dc voltage Vi provided by the power Vin is as follows: ic is g Vi, where g is transconductance. The voltage Vc at the node P, i.e. the output voltage of the charging module 20, will rise linearly with time (please refer to fig. 7), and the time exceeding the reference voltage Vref is Trvc, which is related to the charging current Ic as follows: trvc ═ C × Vref/Ic. When the voltage Vc at the node P exceeds the reference voltage Vref, the rectangular wave signal FB output by the comparator COMP changes from a high level to a low level.
When the first control signal K1 is at a high level, the electronic switch Q1 is turned on, the capacitor C discharges to ground, the current Ic output by the voltage-controlled current source VCCS flows through the electronic switch Q1, the voltage Vc at the node P rapidly drops to zero, and at this time, the rectangular wave signal FB output by the comparator COMP is at a high level. When the first control signal is periodically changed in this way, the switching power supply control circuit 100 repeats the above operation.
When the dc voltage Vi provided by the power Vin increases (please refer to fig. 8), the charging current Ic of the capacitor C increases linearly, and the time when the voltage Vc at the node P rises above the reference voltage Vref decreases correspondingly, i.e. advances in time. When the dc voltage Vi provided by the power Vin decreases, the charging current Ic of the capacitor C decreases linearly, and the time when the voltage Vc at the node P rises above the reference voltage Vref increases correspondingly, i.e. time delay. Thus, the duty ratio of the rectangular wave signal FB output by the comparator COMP to the control module 50 will vary linearly with the variation of the dc voltage Vi provided by the power source Vin.
In this embodiment, the capacitor C may be set between 100pF and 1000pF, which is too small to be easily interfered and too large to increase the current stress of the electronic switch Q1. Specifically, the value of the capacitor C may be determined according to the driving switching frequency fsw, the current capability Ic of the voltage-controlled current source VCCS, and the maximum on-time of the electronic switch Q1.
Further, in the design of discrete devices, the control module 50 may include a logic processing unit 52 and a pulse width modulation unit 54 (see fig. 4). One end of the logic processing unit 52 is electrically connected to the pulse width modulation unit 54, and the other end of the logic processing unit 52 is electrically connected to the discharge module 30 and the comparison module 40. The pulse width modulation unit 54 is configured to send a second control signal to the logic processing unit 52. The logic processing unit 52 is configured to output the first control signal to the discharging module 30 after processing the second control signal, and is further configured to receive the rectangular wave signal output by the comparing module 40, the logic processing unit 52 performs logic processing on the rectangular wave signal and the first control signal to output a voltage signal with a duty ratio required by the switching power supply to the pulse width modulating unit 54, and the pulse width modulating unit 54 correspondingly outputs a driving signal according to the voltage signal, so as to implement voltage stabilization output on the switching power supply.
In a single-direction power supply, the logic processing unit 52 may include an AND gate AND1 AND a NOT gate U1 (see fig. 9). A first input end of the AND gate AND1 is electrically connected to the output end of the comparator COMP, AND a second input end of the AND gate AND1 is electrically connected to the input end of the not gate U1. The output of the AND gate AND1 is electrically connected to the pulse width modulation unit 54. The input end of the not gate U1 is electrically connected with the pulse width modulation unit 54, and the output end of the not gate U1 is electrically connected with the first end of the electronic switch Q1. In this way, the rectangular wave signal FB and the second control signal K2 are logically and-converted to output a voltage signal GD1 with a duty ratio required by the switching power supply to the pulse width modulation unit 54, so as to determine the duty ratio of the driving signal. In this embodiment, the duty ratio of the second control signal K2 may be set to 50%, and the frequency thereof is the same as the frequency of the driving signal required for the switching power supply and is logically the same as the level of the driving signal.
In a bi-directionally energized power supply, the logic processing unit 52 may include an AND gate AND2, an AND gate AND3, AND a NOR gate NOR (see FIG. 10). A first input end of the AND gate AND2 AND a first input end of the AND gate AND3 are both electrically connected to an output end of the comparator COMP, AND a second input end of the AND gate AND2 AND a second input end of the AND gate AND3 are respectively connected to a first input end of the NOR gate NOR AND a second input end of the NOR gate NOR in a one-to-one correspondence. The output terminal of the NOR gate NOR is electrically connected to the first terminal of the electronic switch Q1. In this way, the first control signal K1 is generated by performing nor logic transformation on the third control signal K3 and the fourth control signal K4 outputted by the pwm unit 54. The rectangular wave signal FB is logically and-converted with the third control signal K3 and the fourth control signal K4 to generate a voltage signal GD2 and a voltage signal GD3 corresponding to the duty ratio required by the switching power supply, so that the pulse width modulation unit 54 outputs a driving signal corresponding to the duty ratio. In this embodiment, the high level time of the second control signal K1 may be a power supply minimum dead time, which is a nor logic relationship between two driving signals at a maximum duty ratio, at a frequency twice the power supply switching frequency.
The switching power supply control circuit generates an output voltage linearly changing along with charging time through the charging module 20, the waveform slope of the output voltage linearly changes along with the change of the direct current voltage provided by the power supply input end 10, the output voltage is periodically discharged through the discharging module 30 so as to process the waveform of the output voltage into a sawtooth waveform, and the voltage of the sawtooth waveform is compared with a reference voltage value through the comparing module 40 so as to output a rectangular wave signal with a corresponding duty ratio to the control module 50, so that a driving signal with the duty ratio required by the switching power supply can be output. Therefore, when the wide-range input and the voltage stabilization output of the switching power supply are realized, the circuit design is greatly simplified, the power supply efficiency is improved, the development cost is reduced, and the miniaturization design is facilitated.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides a switching power supply control circuit, includes power input end and control module, control module is used for sending first control signal, in order with the direct voltage that power input end provided converts the drive signal into corresponding duty cycle, its characterized in that, switching power supply control circuit still includes:
the charging module is electrically connected with the power supply input end and used for charging under the power supply of the direct-current voltage and generating output voltage which linearly changes along with charging time, and the waveform slope of the output voltage linearly changes along with the change of the direct-current voltage;
the discharging module is electrically connected between the charging module and the control module and used for receiving the first control signal and periodically discharging the output voltage according to the first control signal so as to process the waveform of the output voltage generated by the output end of the charging module into a sawtooth waveform;
the comparison module is electrically connected between the charging module and the control module and used for comparing the output voltage processed by the discharging module with a reference voltage so as to output a rectangular wave signal corresponding to the duty ratio to the control module, and the control module outputs a driving signal corresponding to the duty ratio according to the first control signal and the rectangular wave signal.
2. The switching power supply control circuit according to claim 1, wherein the charging module includes a voltage-controlled current source and a capacitor, one end of the voltage-controlled current source is electrically connected to the power input terminal, the other end of the voltage-controlled current source is electrically connected to one end of the capacitor, the other end of the capacitor is grounded, and the voltage-controlled current source is configured to charge the capacitor.
3. The switching power supply control circuit according to claim 2, wherein the discharging module comprises an electronic switch, a first terminal of the electronic switch is electrically connected to the control module, a second terminal of the electronic switch is grounded, and a third terminal of the electronic switch is electrically connected between the voltage-controlled current source and the capacitor.
4. The switching power supply control circuit according to claim 3, wherein the electronic switch is an N-channel enhancement type FET, and the first terminal, the second terminal and the third terminal of the electronic switch correspond to a gate, a source and a drain of the N-channel enhancement type FET, respectively.
5. The switching power supply control circuit according to claim 3, wherein the comparing module comprises a comparator, an inverting input terminal of the comparator is electrically connected between the voltage-controlled current source and the capacitor, and a non-inverting input terminal of the comparator is electrically connected to a reference voltage;
when the output voltage processed by the discharging module is smaller than the reference voltage, the rectangular wave signal output by the comparing module is at a high level;
and when the output voltage processed by the discharging module is greater than the reference voltage, the rectangular wave signal output by the comparing module is at a low level.
6. The switching power supply control circuit according to claim 5, wherein the control module comprises a pulse width modulation unit and a logic processing unit, one end of the logic processing unit is electrically connected with the pulse width modulation unit, the other end of the logic processing unit is electrically connected with the discharging module and the comparison module, the pulse width modulation unit is used for sending a second control signal to the logic processing unit, the logic processing unit is used for processing the second control signal and then outputting the first control signal to the discharging module, and is also used for receiving the rectangular wave signal output by the comparing module, the logic processing unit performs logic processing on the rectangular wave signal and the first control signal, and the pulse width modulation unit is used for correspondingly outputting a driving signal with a duty ratio required by the switching power supply according to the voltage signal.
7. The switching power supply control circuit according to claim 6, wherein the logic processing unit comprises a first and gate and a not gate, a first input terminal of the first and gate is electrically connected to the output terminal of the comparator, a second input terminal of the first and gate is electrically connected to the input terminal of the not gate, an output terminal of the first and gate is electrically connected to the pulse width modulation unit, an input terminal of the not gate is electrically connected to the pulse width modulation unit, and an output terminal of the not gate is electrically connected to the first terminal of the electronic switch.
8. The switching power supply control circuit according to claim 6, wherein the logic processing unit includes a second and gate, a third and gate and a nor gate, the first input end of the second and gate and the first input end of the third and gate are electrically connected to the output end of the comparator, the second input end of the second and gate and the second input end of the third and gate are respectively connected to the first input end of the nor gate and the second input end of the nor gate in a one-to-one correspondence manner, and the output end of the nor gate is electrically connected to the first end of the electronic switch after being inverted.
9. The switching power supply control circuit according to claim 1, wherein the control module comprises a main control chip, and the main control chip is a complex programmable logic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020016843.1U CN211557132U (en) | 2020-01-03 | 2020-01-03 | Switching power supply control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020016843.1U CN211557132U (en) | 2020-01-03 | 2020-01-03 | Switching power supply control circuit |
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| CN211557132U true CN211557132U (en) | 2020-09-22 |
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| CN202020016843.1U Active CN211557132U (en) | 2020-01-03 | 2020-01-03 | Switching power supply control circuit |
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