CN219875490U - Multi-path time sequence control circuit and multi-path output switch converter - Google Patents
Multi-path time sequence control circuit and multi-path output switch converter Download PDFInfo
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- CN219875490U CN219875490U CN202321118835.8U CN202321118835U CN219875490U CN 219875490 U CN219875490 U CN 219875490U CN 202321118835 U CN202321118835 U CN 202321118835U CN 219875490 U CN219875490 U CN 219875490U
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Abstract
The utility model discloses a multipath time sequence control circuit and a multipath output switching converter, wherein the switching converter comprises a K-path power supply circuit, wherein K is an integer greater than or equal to 2; when the auxiliary voltage of the Nth power supply circuit is established, the capacitor C1 is charged through the constant current adjustable circuit, when the voltage of the capacitor C1 is larger than a first reference signal, the first comparison circuit outputs an opening signal to enable the Mth power supply circuit to be opened, when the voltage of the capacitor C1 is smaller than the first reference signal, the first comparison circuit outputs a closing signal to enable the Mth power supply circuit to be closed, and when the output voltage of the Mth power supply circuit is larger than a second reference signal, the second comparison circuit outputs a control signal to control the capacitor C1 to discharge, wherein the current of the constant current adjustable circuit is adjustable. For products with different fixed delay time requirements between the modules, the circuit can provide reliable delay time requirements, and avoid product failure caused by time sequence problems.
Description
Technical Field
The utility model relates to the technical field of switching converters, in particular to a multipath time sequence control circuit and a multipath output switching converter.
Background
At present, the output product of the multi-output switch converter is applied to a system, and has the power-on time sequence requirement and the power-off time sequence requirement for each voltage, if the second circuit is required to be started after the first circuit is powered on for a period of time, otherwise, the equipment powered on by the second circuit acts first, and the system can be ensured to work reliably and stably only if functional faults exist or the reliable and stable working and running of the system cannot be ensured. The conventional multi-output power supply establishes basic synchronization of the time sequences among the multi-output during power-up and the time sequences among the multi-output during power-down basically depend on the capacity of the capacitor, and cannot meet the requirements of users, so that reliable delay control needs to be added. In the prior art, two schemes are generally adopted to carry out delay control on the multi-output switch converter, and firstly, a digital control IC is adopted to control the power-on time sequence and the power-off time sequence of multi-output, so that the delay control can be accurately carried out, but the cost of the scheme is higher; the scheme II adopts an RC charge-discharge mode, and the scheme has low cost, but the delay time can not be accurately controlled, only a single power-on time sequence can be controlled, and the device parameters are fixed and not adjustable, so that the application range is limited.
Disclosure of Invention
The utility model aims to overcome at least one defect in the prior art, and provides a multi-path time sequence control circuit and a multi-path output switch converter, which not only can accurately realize the power-on time sequence control of a multi-path power supply circuit, but also can realize the power-off time sequence control, and can expand the multi-path voltage time sequence control.
The technical scheme adopted by the utility model is as follows:
in a first aspect, a multi-path timing control circuit is provided, and the multi-path timing control circuit is applied to a multi-path output switching converter, wherein the switching converter comprises a K-path power supply circuit, and K is an integer greater than or equal to 2; the multi-path timing control circuit includes: the constant current adjustable circuit, the capacitor C1, the switching tube Q3, the first comparison circuit and the second comparison circuit; the first end of the constant current adjustable circuit is used for accessing the auxiliary voltage of the Nth power supply circuit, the second end of the constant current adjustable circuit is connected with one end of the capacitor C1, the first end of the switch tube Q3 and the second input end of the first comparison circuit, and the third end of the constant current adjustable circuit is grounded with the other end of the charge point capacitor C1; the first input end of the first comparison circuit is used for accessing a first reference signal, and the output end of the first comparison circuit is used for being connected with the control end of the Mth power circuit; the control end of the switching tube Q3 is connected with the output end of the second comparison circuit, and the second end is grounded; the first input end of the second comparison circuit is used for being connected with the output voltage of the Mth power supply circuit, the second input end of the second comparison circuit is used for being connected with a second reference signal, N is smaller than M, N and M are integers which are larger than or equal to 1, and M is smaller than or equal to K;
when the auxiliary voltage of the Nth power supply circuit is established, the capacitor C1 is charged through the constant current adjustable circuit, when the voltage of the capacitor C1 is larger than a first reference signal, the first comparison circuit outputs an opening signal to enable the Mth power supply circuit to be opened, when the voltage of the capacitor C1 is smaller than the first reference signal, the first comparison circuit outputs a closing signal to enable the Mth power supply circuit to be closed, and when the output voltage of the Mth power supply circuit is larger than a second reference signal, the second comparison circuit outputs a control signal to control the capacitor C1 to discharge, wherein the current of the constant current adjustable circuit is adjustable.
Preferably, the second end of the constant current adjustable circuit and one end of the capacitor C1 are connected with the first end of the switch tube Q3 and the second input end of the first comparison circuit through a resistor R3.
Preferably, the constant current adjustable circuit comprises a resistor R1, a resistor R2, a resistor R4, a resistor RP1, a triode Q1 and a triode Q2; one end of a resistor R4 is connected with an emitter of a triode Q1 and serves as a first end of the constant current adjustable circuit, the other end of the resistor R4 is connected with one end of a resistor RP1, the other end of the resistor RP1 is connected with a base of the triode Q1 and an emitter of a triode Q2, a collector of the triode Q1 is connected with the base of the triode Q2 and one end of the resistor R1, a collector of the triode Q2 is connected with one end of the resistor R2 and serves as a second end of the constant current adjustable circuit, and one end of the resistor R1 is connected with one end of the resistor R2 and serves as a third end of the constant current adjustable circuit.
Preferably, the resistor RP1 is an adjustable resistor.
Preferably, the first reference signal is equal to the second reference signal.
Preferably, the first comparing circuit is a comparator X1, the first input terminal is a positive input terminal, and the second input terminal is a negative input terminal.
Preferably, the second comparing circuit is a comparator X2, the first input terminal is a positive input terminal, and the second input terminal is a negative input terminal.
Preferably, the switching tube Q3 is an NMOS tube, the first end is a drain, the second end is a source, and the control end is a gate.
In a second aspect, a multi-path timing control circuit is provided, and the multi-path timing control circuit is applied to a multi-path output switching converter, wherein the switching converter comprises a K-path power supply circuit, and K is an integer greater than or equal to 2; the multi-path timing control circuit includes: the constant current adjustable circuit, the capacitor C1, the switch tube Q3, the resistor R3, the first comparison circuit and the second comparison circuit;
the constant current adjustable circuit comprises a resistor R1, a resistor R2, a resistor R4, a resistor RP1, a triode Q1 and a triode Q2; the first comparison circuit and the second comparison circuit are a comparator X1 and a comparator X2 respectively;
one end of a resistor R4 is connected with the emitter of the triode Q1 and then is used for being connected with the auxiliary voltage of the N-th power supply circuit, the other end of the resistor R4 is connected with one end of a resistor RP1, the other end of the resistor RP1 is connected with the base of the triode Q1 and the emitter of the triode Q2, the collector of the triode Q1 is connected with the base of the triode Q2 and one end of the resistor R1, the collector of the triode Q2 is connected with one end of the resistor R2 and one end of a capacitor C1 and then is connected with the first end of a switch tube Q3 and the negative input end of a comparator X1 through a resistor R3, the positive input end of the comparator X1 is used for accessing a first reference signal, the output end of the comparator X1 is used for being connected with the control end of an Mth power supply circuit, the control end of the switching tube Q3 is connected with the output end of the comparator X2, the positive input end of the comparator X2 is used for accessing the output voltage of the Mth power supply circuit, the negative input end is used for accessing a second reference signal, one end of the resistor R1, one end of the resistor R2, one end of the capacitor C1 and the second end of the switching tube Q3 are grounded, wherein N is smaller than M, M is smaller than or equal to K, and N and M are integers larger than or equal to 1.
In a third aspect, a multiple-output switching converter is provided, including K power supply circuits and a plurality of multiple-timing control circuits as described above, where K is an integer greater than or equal to 2, and one of the multiple-timing circuits is connected to both of the power supply circuits.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model charges the capacitor through the constant current adjustable circuit to form a linearly rising voltage, the linearly rising voltage is compared with the reference signal, and a rising or falling edge of a required delay time is generated according to a comparison result, wherein the current of the constant current adjustable circuit is controlled by the adjustable resistor, so that a time sequence delay adjustable circuit is formed, the corresponding capacitor discharge is controlled by the switch tube through an external signal, the requirement of repeated switching on the delay time is met, the power-on time sequence control of the multipath power supply circuit can be accurately realized, the power-off time sequence control can be realized, and the extension of multipath voltage time sequence control can be carried out; the addition of the adjustable resistor can meet the adjustment requirements of different delay time lengths under the condition of not changing the parameters of the device according to different user requirements, and is suitable for the requirements of module products on delay time under different application conditions; the utility model integrates the power-on time sequence control and the power-off time sequence control, has adjustable delay, simple circuit, high control accuracy and low cost, can expand a new time sequence control circuit and has high practicability.
Drawings
FIG. 1 is a schematic block diagram of a first embodiment of the present utility model;
fig. 2 is a waveform diagram illustrating the operation of the first embodiment of the present utility model.
Detailed Description
In order that those skilled in the art will readily understand the utility model, the utility model will be described with reference to specific embodiments.
Referring to fig. 1, a schematic diagram of a multi-path timing control circuit according to the present embodiment is shown, in the present embodiment, a multi-path timing control circuit is provided and is applied to a multi-path output switching converter, where the switching converter includes a K-path power supply circuit, where K is an integer greater than or equal to 2; the multi-path time sequence control circuit is characterized by comprising: the constant current adjustable circuit, the capacitor C1, the switching tube Q3, the first comparison circuit and the second comparison circuit; the first end of the constant current adjustable circuit is used for accessing the auxiliary voltage of the Nth power supply circuit, the second end of the constant current adjustable circuit is connected with one end of the capacitor C1, the first end of the switch tube Q3 and the second input end of the first comparison circuit, and the third end of the constant current adjustable circuit is grounded with the other end of the charge point capacitor C1; the first input end of the first comparison circuit is used for accessing a first reference signal, and the output end of the first comparison circuit is used for being connected with the control end of the Mth power circuit; the control end of the switching tube Q3 is connected with the output end of the second comparison circuit, and the second end is grounded; the first input end of the second comparison circuit is used for being connected with the output voltage of the Mth power supply circuit, the second input end of the second comparison circuit is used for being connected with a second reference signal, N is smaller than M, N and M are integers which are larger than or equal to 1, and M is smaller than or equal to K;
when the auxiliary voltage of the Nth power supply circuit is established, the capacitor C1 is charged through the constant current adjustable circuit, when the voltage of the capacitor C1 is larger than a first reference signal, the first comparison circuit outputs an opening signal to enable the Mth power supply circuit to be opened, when the voltage of the capacitor C1 is smaller than the first reference signal, the first comparison circuit outputs a closing signal to enable the Mth power supply circuit to be closed, and when the output voltage of the Mth power supply circuit is larger than a second reference signal, the second comparison circuit outputs a control signal to control the capacitor C1 to discharge, wherein the current of the constant current adjustable circuit is adjustable.
As a specific embodiment of the constant current adjustable circuit, the constant current adjustable circuit comprises a resistor R1, a resistor R2, a resistor R4, a resistor RP1, a triode Q1 and a triode Q2; one end of a resistor R4 is connected with an emitter of a triode Q1, the resistor R4 serves as a first end of the constant current adjustable circuit, the other end of the resistor R4 is connected with one end of a resistor RP1, the other end of the resistor RP1 is connected with a base of the triode Q1 and an emitter of a triode Q2, a collector of the triode Q1 is connected with the base of the triode Q2 and one end of the resistor R1, the collector of the triode Q2 serves as a second end of the constant current adjustable circuit after being connected with one end of the resistor R2, and the other end of the resistor R1 serves as a third end of the constant current adjustable circuit after being connected with one end of the resistor R2, and the resistor RP1 is an adjustable resistor.
In the implementation process, the first comparison circuit is a comparator X1, the first input end is a positive input end, and the second input end is a negative input end; the second comparison circuit is a comparator X2, the first input end is a positive input end, and the second input end is a negative input end; the switch tube Q3 is an NMOS tube, the first end is a drain electrode, the second end is a source electrode, the control end is a grid electrode, and the specific connection relation of the components is as follows:
one end of a resistor R4 is connected with an emitter of a triode Q1 and then is used for being connected with an auxiliary voltage of an N-th power supply circuit, the other end of the resistor R4 is connected with one end of a resistor RP1, the other end of the resistor RP1 is connected with a base of the triode Q1 and an emitter of a triode Q2, a collector of the triode Q1 is connected with the base of the triode Q2 and one end of a resistor R1, a collector of the triode Q2 is connected with one end of the resistor R2 and one end of a capacitor C1 and then is connected with a first end of a switch tube Q3 and a negative input end of a comparator X1 through a resistor R3, a positive input end of the comparator X1 is used for being connected with a first reference signal, an output end of the switch tube Q3 is connected with an output end of the comparator X2, a positive input end of the comparator X2 is used for being connected with an output voltage of the M-th power supply circuit, and a negative input end of the resistor R2, one end of the capacitor C1 and a second end of the switch tube Q3 are connected with ground.
Taking the nth path as a first path and the mth path as a second path as an example, the working principle of the embodiment is described with reference to the waveform diagram of fig. 2:
calculating required parameters according to required application occasions, adjusting an adjustable resistor to a proper resistance value, when a power supply of a switching converter is electrified and started, establishing an auxiliary voltage of a first path, providing base current for a triode Q1 through the adjustable resistor RP1, conducting the triode Q1 when the emitter voltage of the triode Q1 is higher than 0.7V of the base voltage, conducting the triode Q2 when the emitter voltage of the triode Q2 is higher than 0.7V of the base voltage, charging a capacitor C1 through the resistor RP1, comparing the voltage of the capacitor C1 with a first reference signal Verf by a comparator X1, and outputting a high level by the comparator X1 when the voltage of the capacitor C1 is smaller than the first reference signal, so that a control end of a second path of power supply circuit is set to be high, and the second path of power supply circuit is kept to be turned off; when the voltage of the capacitor C1 is larger than the first reference signal, the comparator X1 outputs a low level to enable the control end of the second path of power supply circuit to be set low, so that the second path of power supply circuit is started, and auxiliary voltage is established; the comparator X2 compares the output voltage of the second power supply circuit with the second reference signal, when the output voltage is established and is larger than the second reference signal, the comparator X2 outputs a high level, thereby controlling the switch tube Q3 to be conducted, discharging the capacitor C1 through the resistor R3,
the stable voltage on the resistor RP1 is 0.7V, so that the constant charging current is determined by the resistor RP1 and the resistor R4, the charging voltage of the corresponding capacitor C1 is linearly increased, the specific required amplitude is determined by the ratio of the resistor RP1, the resistor R4 and the resistor R2, the required delay signal is generated by comparing the comparator X1 with the first reference signal, the power-up time sequence of the second power circuit is controlled, the required turn-off signal is generated by comparing the output voltage of the second power circuit with the second reference signal to turn on the switching tube Q3, and the capacitor C1 is discharged through the resistor R3, so that the power-down time sequence of the second power circuit is controlled.
Specifically, the first reference signal may be equal to the second reference signal, which may be set according to practical applications, and is defined herein.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that the foregoing preferred embodiment should not be construed as limiting the present utility model, and the resistors in other embodiments may be replaced by a plurality of series-parallel connections. It will be apparent to those skilled in the art that various changes, modifications and variations can be made therein without departing from the spirit and scope of the utility model, and it is intended that the utility model be limited only by the terms of the appended claims. All references to "electrically coupled," "connected," and "connected" in this patent are not intended to refer to the elements as being directly connected, but rather to the fact that, depending on the particular implementation, a coupling configuration may be formed with the addition or subtraction of coupling aids, where "electrically coupled" is explicitly used herein for the purpose of highlighting this meaning, but does not exclude that "connected" and "connected" are used. The technical features in the utility model can be interactively combined on the premise of no contradiction and conflict.
Claims (10)
1. A multi-path time sequence control circuit is applied to a multi-path output switching converter, and the switching converter comprises a K-path power supply circuit, wherein K is an integer greater than or equal to 2; the multi-path time sequence control circuit is characterized by comprising: the constant current adjustable circuit, the capacitor C1, the switching tube Q3, the first comparison circuit and the second comparison circuit; the first end of the constant current adjustable circuit is used for accessing the auxiliary voltage of the Nth power supply circuit, the second end of the constant current adjustable circuit is connected with one end of the capacitor C1, the first end of the switch tube Q3 and the second input end of the first comparison circuit, and the third end of the constant current adjustable circuit is grounded with the other end of the charge point capacitor C1; the first input end of the first comparison circuit is used for accessing a first reference signal, and the output end of the first comparison circuit is used for being connected with the control end of the Mth power circuit; the control end of the switching tube Q3 is connected with the output end of the second comparison circuit, and the second end is grounded; the first input end of the second comparison circuit is used for being connected with the output voltage of the Mth power supply circuit, the second input end of the second comparison circuit is used for being connected with a second reference signal, N is smaller than M, N and M are integers which are larger than or equal to 1, and M is smaller than or equal to K;
when the auxiliary voltage of the Nth power supply circuit is established, the capacitor C1 is charged through the constant current adjustable circuit, when the voltage of the capacitor C1 is larger than a first reference signal, the first comparison circuit outputs an opening signal to enable the Mth power supply circuit to be opened, when the voltage of the capacitor C1 is smaller than the first reference signal, the first comparison circuit outputs a closing signal to enable the Mth power supply circuit to be closed, and when the output voltage of the Mth power supply circuit is larger than a second reference signal, the second comparison circuit outputs a control signal to control the capacitor C1 to discharge, wherein the current of the constant current adjustable circuit is adjustable.
2. The multi-path timing control circuit according to claim 1, wherein the second end of the constant current adjustable circuit and one end of the capacitor C1 are connected with the first end of the switch tube Q3 and the second input end of the first comparison circuit through a resistor R3.
3. The multi-path timing control circuit according to claim 1, wherein the constant current adjustable circuit comprises a resistor R1, a resistor R2, a resistor R4, a resistor RP1, a transistor Q1 and a transistor Q2; one end of a resistor R4 is connected with an emitter of a triode Q1 and serves as a first end of the constant current adjustable circuit, the other end of the resistor R4 is connected with one end of a resistor RP1, the other end of the resistor RP1 is connected with a base of the triode Q1 and an emitter of a triode Q2, a collector of the triode Q1 is connected with the base of the triode Q2 and one end of the resistor R1, a collector of the triode Q2 is connected with one end of the resistor R2 and serves as a second end of the constant current adjustable circuit, and one end of the resistor R1 is connected with one end of the resistor R2 and serves as a third end of the constant current adjustable circuit.
4. A multi-path timing control circuit according to claim 3, wherein the resistor RP1 is an adjustable resistor.
5. The multi-path timing control circuit of claim 1, wherein the first reference signal is equal to the second reference signal.
6. The multi-path timing control circuit of claim 1, wherein the first comparison circuit is a comparator X1, the first input is a positive input, and the second input is a negative input.
7. The multi-path timing control circuit of claim 1, wherein the second comparator circuit is a comparator X2, the first input terminal is a positive input terminal, and the second input terminal is a negative input terminal.
8. The multi-channel timing control circuit of claim 1, wherein the switching transistor Q3 is an NMOS transistor, the first terminal is a drain, the second terminal is a source, and the control terminal is a gate.
9. A multi-path time sequence control circuit is applied to a multi-path output switching converter, and the switching converter comprises a K-path power supply circuit, wherein K is an integer greater than or equal to 2; the multi-path time sequence control circuit is characterized by comprising: the constant current adjustable circuit, the capacitor C1, the switch tube Q3, the resistor R3, the first comparison circuit and the second comparison circuit;
the constant current adjustable circuit comprises a resistor R1, a resistor R2, a resistor R4, a resistor RP1, a triode Q1 and a triode Q2; the first comparison circuit and the second comparison circuit are a comparator X1 and a comparator X2 respectively;
one end of a resistor R4 is connected with the emitter of the triode Q1 and then is used for being connected with the auxiliary voltage of the N-th power supply circuit, the other end of the resistor R4 is connected with one end of a resistor RP1, the other end of the resistor RP1 is connected with the base of the triode Q1 and the emitter of the triode Q2, the collector of the triode Q1 is connected with the base of the triode Q2 and one end of the resistor R1, the collector of the triode Q2 is connected with one end of the resistor R2 and one end of a capacitor C1 and then is connected with the first end of a switch tube Q3 and the negative input end of a comparator X1 through a resistor R3, the positive input end of the comparator X1 is used for accessing a first reference signal, the output end of the comparator X1 is used for being connected with the control end of an Mth power supply circuit, the control end of the switching tube Q3 is connected with the output end of the comparator X2, the positive input end of the comparator X2 is used for accessing the output voltage of the Mth power supply circuit, the negative input end is used for accessing a second reference signal, one end of the resistor R1, one end of the resistor R2, one end of the capacitor C1 and the second end of the switching tube Q3 are grounded, wherein N is smaller than M, M is smaller than or equal to K, and N and M are integers larger than or equal to 1.
10. A multi-output switching converter comprising K power supply circuits and a plurality of multi-path timing control circuits according to any one of claims 1 to 9, one multi-path timing circuit being connected to each of the two power supply circuits, wherein K is an integer greater than or equal to 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321118835.8U CN219875490U (en) | 2023-05-11 | 2023-05-11 | Multi-path time sequence control circuit and multi-path output switch converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321118835.8U CN219875490U (en) | 2023-05-11 | 2023-05-11 | Multi-path time sequence control circuit and multi-path output switch converter |
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| CN219875490U true CN219875490U (en) | 2023-10-20 |
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| CN202321118835.8U Active CN219875490U (en) | 2023-05-11 | 2023-05-11 | Multi-path time sequence control circuit and multi-path output switch converter |
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