WO2021128716A1 - Multiplexed output short-circuit protection circuit - Google Patents
Multiplexed output short-circuit protection circuit Download PDFInfo
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- WO2021128716A1 WO2021128716A1 PCT/CN2020/091105 CN2020091105W WO2021128716A1 WO 2021128716 A1 WO2021128716 A1 WO 2021128716A1 CN 2020091105 W CN2020091105 W CN 2020091105W WO 2021128716 A1 WO2021128716 A1 WO 2021128716A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
Definitions
- the embodiment of the present invention relates to the field of integrated circuit technology, in particular to a multi-output short-circuit protection circuit.
- the current way to realize the output of multiple isolated power signals is to use multiple ready-made isolated power modules, but the isolated power modules are expensive, which undoubtedly increases the technical cost of realizing the output of multiple isolated power signals.
- different isolated power signal output branches The connected load is unavoidably short-circuited. The short-circuit process is prone to large abrupt currents. Large short-circuit power consumption will cause the components in the multi-channel isolated power signal output line to burn out and affect the normal operation of the equipment.
- the embodiment of the present invention provides a multi-output short-circuit protection circuit, which effectively reduces the cost of outputting multi-channel isolated power supplies, and at the same time, realizes short-circuit protection for each isolated power output branch, reducing multiple outputs. The probability that the device in the output circuit of the isolated power supply signal will be burnt out.
- the embodiment of the present invention provides a multi-output short-circuit protection circuit, including:
- a power supply module an input winding and a plurality of output windings, the power supply module is used to supply power to the input winding, and the output winding is used to couple a power signal transmitted by the input winding and output an isolated power signal to a corresponding load;
- a plurality of short-circuit detection circuits for adjusting the output short-circuit control signal according to the isolated power signal output by the corresponding output winding
- the short circuit protection circuit is used to adjust the power supply control signal output to the power supply module according to the short circuit control signals output by all the short circuit detection circuits, so as to control the power supply state of the power supply module to the input winding.
- the short-circuit detection circuit includes:
- the first switch circuit is configured to adjust the output first switch control signal according to the received isolated power supply signal output by the corresponding output winding;
- the second switch circuit is configured to adjust the output short-circuit control signal according to the received first switch control signal.
- the first switch circuit includes:
- a first voltage dividing device and a second voltage dividing device the first end of the first voltage dividing device is connected to the isolated power signal, and the second end of the first voltage dividing device is connected to the second voltage dividing device Is electrically connected to the first end, and the second end of the second voltage divider is connected to the first set power signal;
- a first switching device the control terminal of the first switching device is electrically connected to the second terminal of the first voltage dividing device, and the first terminal of the first switching device is connected to the first set power signal, The second terminal of the first switch device is used to output the first switch control signal;
- the second switch circuit includes:
- a light emitting device a first end of the light emitting device is connected to a second set power signal, and a second end of the light emitting device is connected to the first switch control signal;
- a photosensitive device the first end of the photosensitive device is connected to the first set power signal, and the second end of the photosensitive device is used to output the short-circuit control signal.
- the short-circuit protection circuit includes:
- the third switch circuit is configured to adjust the first power supply control signal output to the power supply module according to the received short-circuit control signal.
- the third switch circuit includes:
- the third switch device the control terminal of the third switch device is connected to the short circuit control signal, the first terminal of the third switch device is connected to the first set power signal, and the second terminal of the third switch device is connected to the first set power signal.
- the terminal is electrically connected to the first power supply control terminal of the power supply module and outputs the first power supply control signal.
- the third switch circuit further includes:
- the first capacitive reactance device the first end of the first capacitive reactance device is connected to the first set power signal, and the second end of the first capacitive reactance device is electrically connected to the control end of the third switching device. connection.
- the short-circuit protection circuit further includes:
- the fourth switch circuit is configured to adjust the second power supply control signal output to the power supply module according to the received first power supply control signal.
- the fourth switch circuit includes:
- a fourth switching device a control terminal of the fourth switching device is connected to the first power supply control signal, and a first terminal of the fourth switching device is connected to a first set power signal;
- a fifth switching device the control terminal of the fifth switching device is electrically connected to the second terminal of the fourth switching device, and the first terminal of the fifth switching device is electrically connected to the power-on terminal of the power supply module,
- the second terminal of the fifth switch device is electrically connected to the second power supply control terminal of the power supply module and outputs the second power supply control control signal.
- the power supply module is configured to output a power-on signal through the power-on terminal when detecting that the voltage of the second power-supply control signal received by the second power-supply control terminal changes to a set voltage;
- the short-circuit protection circuit further includes:
- the power-on circuit is configured to power on the second power supply control terminal of the power supply module according to the received power-on signal.
- the power-on circuit includes:
- a third voltage dividing device the first end of the third voltage dividing device is connected to the power-on signal, and the second end of the third voltage dividing device is electrically connected to the control end of the fourth switching device;
- a second capacitive reactance device the first end of the second capacitive reactance device is electrically connected to the control end of the fourth switching device, and the second end of the second capacitive reactance device is connected to the first set power supply signal.
- the embodiment of the present invention provides a multi-output short-circuit protection circuit.
- the multi-output short-circuit protection circuit includes a power supply module, an input winding, and a plurality of output windings.
- the power supply module is used to supply power to the input winding, and the output winding is used to couple the input windings.
- the transmitted power signal is transmitted and the isolated power signal is output to the corresponding load, that is, the input winding and the output winding are used to form a transformer structure. Compared with directly using multiple isolated power modules to drive different loads, it effectively reduces the cost of implementing multiple isolated power supplies.
- the power supply control signal output to the power supply module is adjusted to control the power supply state of the power supply module to the input winding, so that when the load connected to the output winding has a short circuit, the short circuit detection circuit can accurately detect Whether there is a short circuit in the load electrically connected to each output winding, and then control the power supply module to no longer supply power to the input winding when the load electrically connected to any output winding has a short circuit through the short-circuit protection circuit, that is, cut off the power supply line of the power supply module , It realizes the short-circuit protection of each isolated power output branch, and reduces the probability that the components in the multi-channel isolated power signal output circuit are burnt.
- FIG. 1 is a schematic structural diagram of a multi-output short-circuit protection circuit provided by an embodiment of the present invention
- FIG. 2 is a schematic diagram of a specific circuit structure of a short-circuit detection circuit provided by an embodiment of the present invention
- FIG. 3 is a schematic diagram of a specific circuit structure of a short-circuit protection circuit provided by an embodiment of the present invention.
- FIG. 1 is a schematic structural diagram of a multi-output short-circuit protection circuit provided by an embodiment of the present invention.
- the multi-output short circuit protection circuit includes a power supply module 1, an input winding 2 and multiple output windings 3.
- the power supply module 1 is used to supply power to the input winding 2, and the output winding 3 is used to couple the power transmitted by the input winding 2. Signal and output an isolated power signal to the corresponding load (not shown in Figure 1).
- the multiple-output short-circuit protection circuit also includes multiple short-circuit detection circuits 4 and a short-circuit protection circuit 5.
- Figure 1 exemplarily shows that the multiple-output short-circuit protection circuit includes three output windings 3, and the corresponding multiple-output short-circuit protection circuit It includes three short-circuit detection circuits 4, the short-circuit detection circuit 4 is used to adjust the output short-circuit control signal according to the isolated power signal output by the corresponding output winding 3, and the short-circuit protection circuit 5 is used to adjust the short-circuit control signal output by all the short-circuit detection circuits 4
- the power supply control signal output to the power supply module 1 is used to control the power supply state of the power supply module 1 to the input winding 2.
- the power supply module 1 is used to supply power to the input winding 2.
- the power supply module 1 may be a power supply chip.
- the power supply module 1 sends a power supply signal to the input winding 2, and the output winding 3 couples the power signal transmitted by the input winding 2 to the corresponding load.
- the input winding 2 and the output winding 3 can be set to form a transformer structure. In this way, compared to directly using multiple isolated power modules to drive different loads, no additional isolated power modules are needed, which effectively reduces the realization of multiple output isolated power supplies. the cost of.
- each output winding 3 is configured with a corresponding short-circuit detection circuit 4. If a short-circuit problem occurs in the load electrically connected to any output winding 3, the voltage of the isolated power signal output by the corresponding output winding 3 will change, and short-circuit detection Port B of circuit 4 is connected to the isolated power supply signal output by the output winding 3.
- the short-circuit detection circuit 4 detects the change in the voltage of the corresponding isolated power supply signal and adjusts the voltage of the output short-circuit control signal.
- All short-circuit detection circuits 4 are used to output The port A of the short-circuit control signal is short-circuited and then connected to the short-circuit protection circuit 5, so that any change in the voltage of the short-circuit control signal will be detected by the short-circuit protection circuit 5, and the output power supply will be adjusted when the short-circuit protection circuit 5 confirms that there is a short circuit.
- the control signal is used to control the power supply module 1 to no longer supply power to the input winding 2, so as to realize the short-circuit protection of each isolated power output branch, thereby reducing the probability of the device in the multi-channel isolated power signal output line being burned.
- the short-circuit detection circuit 4 includes a first switch circuit 41 and a second switch circuit 42, the first switch circuit 41 uses In order to adjust the output first switch control signal according to the received isolated power supply signal output by the corresponding output winding 3, the second switch circuit 42 is used to adjust the output short-circuit control signal according to the received first switch control signal.
- the first switch circuit 41 in the short-circuit detection circuit 4 receives the isolated power signal output by the first output winding 3, and when the load electrically connected to the first output winding 3 occurs
- the voltage of the isolated power signal received by the first switch circuit 41 from port B changes, which causes the switch state of the first switch circuit 41 to change, and the level of the first switch control signal output by the first switch circuit 41 is high or low.
- the change occurs, which in turn causes the switching state of the second switch circuit 42 to change, the level of the short-circuit control signal output by the second switch circuit 42 changes, and the short-circuit protection circuit 5 detects the change in the level of the short-circuit control signal.
- the power supply module 1 can be controlled to no longer supply power to the input winding 2, so as to realize short-circuit protection.
- the first switching circuit 41 includes a first voltage dividing device R1, a second voltage dividing device R2, and a first switching device K1, and the first end of the first voltage dividing device R1 is connected to the isolation Power signal, the second end of the first voltage divider R1 is electrically connected to the first end of the second voltage divider R2, the second end of the second voltage divider R2 is connected to the first set power signal, the first set
- the power signal can be, for example, a ground signal
- the first voltage dividing device R1 and the second voltage dividing device R2 can be, for example, resistive elements to realize the voltage division of the connected isolated power signal.
- the control terminal of the first switching device K1 is electrically connected to the second terminal of the first voltage divider R1, and the first terminal of the first switching device K1 is connected to the first set power signal, for example Ground signal, the second terminal of the first switching device K1 is used to output the first switching control signal
- the first switching device K1 may be, for example, an insulated gate field effect transistor, that is, a MOS tube, or a triode, that is, a BJT tube.
- the switching device K1 may also be a diode with a control function as shown in FIG. 2. The diode is turned on or off according to the divided voltage signal input from the right control terminal to realize the level of the first switching control signal output by the first switching circuit 41 High adjustment.
- the second switch circuit 42 includes a light emitting device D1 and a photosensitive device T1.
- the first end of the light emitting device D1 is connected to a second set power signal, such as a VDD signal, and the second end of the light emitting device D1 is connected to the first switch control signal, namely It is electrically connected to the second terminal of the first switching device K1, the first terminal of the photosensitive device T1 is connected to a first set power signal, such as a ground signal, and the second terminal of the photosensitive device T1 is used to output a short circuit control signal.
- the light-emitting device D1 may be, for example, a light-emitting diode, and the photosensitive device T1 may be, for example, a phototransistor.
- the light-emitting device D1 controls itself to be turned on or off according to the first switch control signal output by the first switch circuit 41, and emits light when the light-emitting device D1 is turned on.
- the photosensitive device T1 is light-sensitive, and the first set power signal connected to the first end of the photosensitive device T1 can be set to the ground signal, then the short-circuit control signal output by the second end of the photosensitive device T1 is a low-level signal, on the contrary If the light-emitting device D1 is turned off and does not emit light, the short-circuit control signal output by the second end of the photosensitive device T1 is a high-level signal, and the short-circuit protection circuit 5 detects the change in the level of the short-circuit control signal and can control the power supply module 1. No longer supply power to the input winding 2, realizing short-circuit protection.
- FIG. 3 is a schematic diagram of a specific circuit structure of a short-circuit protection circuit provided by an embodiment of the present invention.
- the short-circuit protection circuit 5 includes a third switch circuit 51, and the third switch circuit 51 is used to adjust the first output to the power supply module 1 according to the received short-circuit control signal, that is, the short-circuit control signal input from port A.
- the power supply control signal that is, the first power supply control signal output through the first power supply control terminal COM
- the port A of the third switch circuit 51 is electrically connected to the short-circuit ports A of all the short-circuit detection circuits 4, and the third switch circuit 51 can be based on the port A.
- the level of the received short-circuit control signal adjusts the level of the first power supply control signal output to the power supply module 1.
- the power supply module 1 controls whether to input when the level of the received first power supply control signal is different Winding 2 supplies power.
- the third switch circuit 51 includes a third switch device K3, the control terminal of the third switch device K3 is connected to the short-circuit control signal, and the first terminal of the third switch device K3 is connected to the first terminal.
- Setting a power signal, such as a ground signal the second end of the third switching device K3 is electrically connected to the first power supply control terminal COM of the power supply module 1 and outputs the first power supply control signal.
- the third switching device K3 may be an insulated gate field effect transistor, that is, a MOS tube, or a triode, that is, a BJT tube.
- the control terminal of the third switching device K3 controls its own first control signal according to the received short-circuit control signal. Whether the terminal is connected to the second terminal, the first set power signal connected to the first terminal of the third switching device K3 may be, for example, a ground signal. If the third switching device K3 is turned on, the second terminal of the third switching device K3 The first power supply control signal output to the first power supply control terminal COM of the power supply module 1 is a low-level signal.
- the first power supply control signal output from the second terminal of the third switching device K3 to the first power supply control terminal COM of the power supply module 1 is a high-level signal.
- the level of the short circuit control signal output by the short-circuit detection circuit 4 corresponding to whether the load has a short-circuit condition can be set to be different, thereby controlling the switching state of the third switching device K3 to be different, and the first power supply control terminal COM of the power supply module 1 receives the short-circuit valid Signal (high-level signal or low-level signal) no longer supplies power to the input line group, realizing short-circuit protection.
- the third switch circuit 51 further includes a first capacitive reactance device C1, and a first end of the first capacitive reactance device C1 is connected to a first set power signal, such as a ground signal, The second end of the capacitive reactance device C1 is electrically connected to the control end of the third switching device K3.
- the first capacitive reactance device C1 may be a capacitive element, the first capacitive reactance device C1 is connected to the ground signal GND to the control terminal of the third switching device K3, and the photosensitive device T1 in the short circuit detection circuit 4 is used to output a short circuit control signal.
- the second terminal may also be connected to the second power supply control terminal POW1 of the power supply module 1, that is, the power supply terminal of the power supply module, through a resistance element. It can be set that when the load connected to the output winding 3 has a short circuit, the corresponding divided voltage signal output to the first switching device K1 is a low-level signal, the first switching device K1 is turned off, and the light-emitting device D1 in the optocoupler does not emit light.
- the first end and the second end of the photosensitive device T1 are disconnected.
- the power supply module 1 just starts to supply power to the input winding 2. Since the voltage of the isolated power signal output by the output winding 3 is close to 0V, according to the aforementioned description of the corresponding short-circuit condition, there is no short-circuit when the power is established The situation occurs, but the short-circuit protection will also be triggered by mistake.
- the embodiment of the present invention further includes a first capacitive reactance device C1 by setting the third switch circuit 51, the first end of the first capacitive reactance device C1 is connected to the first set power signal, and the second end of the first capacitive reactance device C1 is connected to
- the control terminal of the third switching device K3 is electrically connected, so that the potential of the control terminal of the third switching device K3 rises slowly, and the short circuit protection will not be directly triggered when the power is established, thereby avoiding the problem of false triggering of the short circuit protection caused by the power establishment. .
- the short-circuit protection circuit 5 further includes a fourth switch circuit 52, and the fourth switch circuit 52 is configured to output to the first power supply control terminal COM according to the received first power supply control signal The signal adjusts the second power supply control signal output to the power supply module 1.
- the first power supply control signal that is, the enable signal of the power supply module, can control the power supply module 1 to stop power supply at the same time.
- the second power supply control signal output by the fourth switching device K4 that is, the signal output to the second power supply control terminal POW1 of the power supply module 1
- the fourth switch circuit 52 includes a fourth switch device K4 and a fifth switch device K5, the control terminal of the fourth switch device K4 is connected to the first power supply control signal, and the fourth switch device K4
- the first end of the fifth switch device K5 is connected to the first set power signal
- the control end of the fifth switch device K5 is electrically connected to the second end of the fourth switch device K4
- the first end of the fifth switch device K5 is connected to the power-on of the power supply module 1.
- the terminal POW is electrically connected
- the second terminal of the fifth switching device K5 is electrically connected with the second power supply control terminal POW1 of the power supply module 1 and outputs a second power supply control control signal.
- the fourth switching device K4 and the fifth switching device K5 may be insulated gate type field effect transistors, that is, MOS transistors, or triodes, that is, BJT tubes.
- MOS transistors MOS transistors
- triodes that is, BJT tubes.
- the fifth switch The switching state of the device K5 is different.
- the fifth switching device K5 can be controlled to be turned off when a short circuit exists.
- the power-on terminal POW of the power supply module 1 is disconnected from the second power supply control terminal POW1, and the second power supply control terminal POW1 is the second power supply
- the control signal is a low-level signal, and the power supply module 1 stops supplying power.
- the power supply module 1 is configured to output power-on through the power-on terminal POW when detecting that the voltage of the second power-supply control signal received by the second power-supply control terminal POW1 has changed to a set voltage Signal
- the short-circuit protection circuit 5 also includes a power-on circuit 53 for powering on the second power supply control terminal POW1 of the power supply module 1 according to the received power-on signal.
- the power-on circuit 53 can be set to include a third voltage divider R3 and The second capacitive reactance device C2, the first end of the third voltage dividing device R3 is connected to the power-on signal, the second end of the third voltage dividing device R3 is electrically connected to the control end of the fourth switching device K4, and the second capacitive reactance device The first end of C2 is electrically connected to the control end of the fourth switching device K4, and the second end of the second capacitive reactance device C2 is connected to a first set power signal, such as a ground signal.
- the short circuit protection since the pin corresponding to the second power supply control terminal POW1 of the power supply module 1 has a certain capacitance, when the voltage of the second power supply control signal received by the second power supply control terminal POW1 drops to 0V after the occurrence of a short circuit, the short circuit protection The process will end, and when the power supply module 1 detects that the voltage of the second power supply control signal received by the second power supply control terminal POW1 has changed to the set voltage, for example, 0V, it outputs the power-on signal through the power-on terminal POW, that is, restarts Power on the power supply module 1, and the power-on signal output by the power-on terminal POW passes through the third voltage divider R3 and the second capacitive reactance device C2, so that the fourth switching device K4 that is turned off during short-circuit protection is turned on again, thereby making The fifth switching device K5 is turned on, the power-on terminal POW of the power supply module 1 is connected to the second power supply control terminal POW1 of the power supply module 1, and
- the relationship between all short-circuit detection circuits 4 is “OR” off, that is, when any short-circuit detection branch detects a short-circuit condition of the corresponding load, it outputs a short-circuit control signal for controlling the short-circuit protection circuit 5 to perform short-circuit protection.
- the short-circuit detection circuit 4 first detects the change in the voltage of the connected isolated power signal through the voltage divider. If the load is short-circuited, the voltage of the isolated power signal will drop. When the voltage of the isolated power signal drops to less than or equal to the set detection voltage, it can Control the first switching device K1 to turn off, and then control the light-emitting device D1 to not emit light, the photosensitive device T1 to output a high level, and then control the third switching device to turn on, and the first power supply control terminal COM of the power supply module receives the low-level first A power supply control signal.
- the fourth switching device K4 is turned off under the action of the low-level first power supply control signal, the fifth switching device K5 is turned off, and POW1 receives the low-level second power supply control signal, and then uses the double short circuit protection mechanism Realize short circuit protection.
- the above multiple output short circuit protection circuit can also be used to achieve overcurrent protection.
- it can be set to reduce the first voltage divider R1 and the second voltage divider R2 when the current value of the isolated power signal output by the output winding 3 is too large. Using the above-mentioned short-circuit protection principle to achieve over-current protection.
- the embodiment of the present invention does not limit whether the switch in the multi-output short-circuit protection circuit is high-level controlled conduction or low-level control conduction.
- the corresponding switch valid signal can be set according to the function of realizing short-circuit protection. It is a high-level signal or a low-level signal.
- the embodiment of the present invention utilizes the input winding and the output winding to form a transformer structure. Compared with directly using multiple isolated power modules to drive different loads, the cost of realizing output multi-channel isolated power supplies is effectively reduced, and the load connected to the output windings is short-circuited.
- the short circuit detection circuit can accurately detect whether there is a short circuit in the load electrically connected to each output winding
- the short circuit protection circuit can control the power supply module to no longer supply power to the input winding when there is a short circuit in any load electrically connected to the output winding. , That is, cut off the power supply circuit of the power supply module, realize the short-circuit protection of each isolated power output branch, and reduce the probability of the device in the multi-channel isolated power signal output line being burned.
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Abstract
A multiplexed output short-circuit protection circuit. The multiplexed output short-circuit protection circuit comprises a power supply module (1), an input winding (2) and a plurality of output windings (3), wherein the power supply module (1) is used for supplying power to the input winding (2), and the output windings (3) are used for coupling a power source signal transmitted by the input winding (2) and outputting isolation power source signals to corresponding loads; a plurality of short-circuit detection circuits (4) used for adjusting an output short-circuit control signal according to the isolation power source signals output by the corresponding output windings (3); and a short-circuit protection circuit (5) used for adjusting, according to short-circuit control signals output by all the short-circuit detection circuits (4), a power supply control signal outputted to the power supply module (1), so as to control a power supply state of the power supply module (1) to the input winding (2). The cost for realizing multiplexed outputting of isolation power sources is effectively reduced, the short-circuit protection for each isolation power source output branch is realized, and the probability of devices in a multiplexed output line of isolation power source signals being burnt out is reduced.
Description
本发明实施例涉及集成电路技术领域,尤其涉及一种多路输出短路保护电路。The embodiment of the present invention relates to the field of integrated circuit technology, in particular to a multi-output short-circuit protection circuit.
随着电子技术的不断发展,各个行业设备的集成化程度越来越高,单板或者设备有时需要不同的隔离电源供给电能,使得单板或者设备中集成多个隔离电源的应用越来越普遍。With the continuous development of electronic technology, the degree of integration of equipment in various industries is getting higher and higher. Single boards or devices sometimes need different isolated power supplies to supply power, making the application of integrating multiple isolated power supplies in single boards or devices more and more common .
目前实现输出多路隔离电源信号的方式是采用多个现成的隔离电源模块,但隔离电源模块价格昂贵,无疑增加了实现输出多路隔离电源信号的技术成本,另外,不同隔离电源信号输出支路连接的负载难以避免地发生短路,短路过程容易产生较大的突变电流,较大的短路功耗会导致多路隔离电源信号输出线路中的器件烧毁,影响设备的正常运行。The current way to realize the output of multiple isolated power signals is to use multiple ready-made isolated power modules, but the isolated power modules are expensive, which undoubtedly increases the technical cost of realizing the output of multiple isolated power signals. In addition, different isolated power signal output branches The connected load is unavoidably short-circuited. The short-circuit process is prone to large abrupt currents. Large short-circuit power consumption will cause the components in the multi-channel isolated power signal output line to burn out and affect the normal operation of the equipment.
发明内容Summary of the invention
有鉴于此,本发明实施例提供了一种多路输出短路保护电路,有效降低了实现输出多路隔离电源的成本的同时,实现了对每一路隔离电源输出支路的短路保护,降低了多路隔离电源信号输出线路中器件被烧毁的概率。In view of this, the embodiment of the present invention provides a multi-output short-circuit protection circuit, which effectively reduces the cost of outputting multi-channel isolated power supplies, and at the same time, realizes short-circuit protection for each isolated power output branch, reducing multiple outputs. The probability that the device in the output circuit of the isolated power supply signal will be burnt out.
本发明实施例提供了一种多路输出短路保护电路,包括:The embodiment of the present invention provides a multi-output short-circuit protection circuit, including:
供电模块、输入绕组和多个输出绕组,所述供电模块用于向所述输入绕组 供电,所述输出绕组用于耦合所述输入绕组传输的电源信号并向对应的负载输出隔离电源信号;A power supply module, an input winding and a plurality of output windings, the power supply module is used to supply power to the input winding, and the output winding is used to couple a power signal transmitted by the input winding and output an isolated power signal to a corresponding load;
多个短路检测电路,用于根据对应的所述输出绕组输出的隔离电源信号调节输出的短路控制信号;A plurality of short-circuit detection circuits for adjusting the output short-circuit control signal according to the isolated power signal output by the corresponding output winding;
短路保护电路,用于根据所有所述短路检测电路输出的所述短路控制信号调节输出至所述供电模块的供电控制信号,以控制所述供电模块向所述输入绕组的供电状态。The short circuit protection circuit is used to adjust the power supply control signal output to the power supply module according to the short circuit control signals output by all the short circuit detection circuits, so as to control the power supply state of the power supply module to the input winding.
进一步地,所述短路检测电路包括:Further, the short-circuit detection circuit includes:
第一开关电路,用于根据接收到的对应的所述输出绕组输出的隔离电源信号调节输出的第一开关控制信号;The first switch circuit is configured to adjust the output first switch control signal according to the received isolated power supply signal output by the corresponding output winding;
第二开关电路,用于根据接收到的所述第一开关控制信号调节输出的所述短路控制信号。The second switch circuit is configured to adjust the output short-circuit control signal according to the received first switch control signal.
进一步地,所述第一开关电路包括:Further, the first switch circuit includes:
第一分压器件和第二分压器件,所述第一分压器件的第一端接入所述隔离电源信号,所述第一分压器件的第二端与所述第二分压器件的第一端电连接,所述第二分压器件的第二端接入第一设定电源信号;A first voltage dividing device and a second voltage dividing device, the first end of the first voltage dividing device is connected to the isolated power signal, and the second end of the first voltage dividing device is connected to the second voltage dividing device Is electrically connected to the first end, and the second end of the second voltage divider is connected to the first set power signal;
第一开关器件,所述第一开关器件的控制端与所述第一分压器件的第二端电连接,所述第一开关器件的第一端接入所述第一设定电源信号,所述第一开关器件的第二端用于输出所述第一开关控制信号;A first switching device, the control terminal of the first switching device is electrically connected to the second terminal of the first voltage dividing device, and the first terminal of the first switching device is connected to the first set power signal, The second terminal of the first switch device is used to output the first switch control signal;
所述第二开关电路包括:The second switch circuit includes:
发光器件,所述发光器件的第一端接入第二设定电源信号,所述发光器件的第二端接入所述第一开关控制信号;A light emitting device, a first end of the light emitting device is connected to a second set power signal, and a second end of the light emitting device is connected to the first switch control signal;
光敏器件,所述光敏器件的第一端接入所述第一设定电源信号,所述光敏器件的第二端用于输出所述短路控制信号。A photosensitive device, the first end of the photosensitive device is connected to the first set power signal, and the second end of the photosensitive device is used to output the short-circuit control signal.
进一步地,所述短路保护电路包括:Further, the short-circuit protection circuit includes:
第三开关电路,用于根据接收到的所述短路控制信号调节输出至所述供电模块的第一供电控制信号。The third switch circuit is configured to adjust the first power supply control signal output to the power supply module according to the received short-circuit control signal.
进一步地,所述第三开关电路包括:Further, the third switch circuit includes:
第三开关器件,所述第三开关器件的控制端接入所述短路控制信号,所述第三开关器件的第一端接入第一设定电源信号,所述第三开关器件的第二端与所述供电模块的第一供电控制端电连接并输出所述第一供电控制信号。The third switch device, the control terminal of the third switch device is connected to the short circuit control signal, the first terminal of the third switch device is connected to the first set power signal, and the second terminal of the third switch device is connected to the first set power signal. The terminal is electrically connected to the first power supply control terminal of the power supply module and outputs the first power supply control signal.
进一步地,所述第三开关电路还包括:Further, the third switch circuit further includes:
第一容抗器件,所述第一容抗器件的第一端接入所述第一设定电源信号,所述第一容抗器件的第二端与所述第三开关器件的控制端电连接。The first capacitive reactance device, the first end of the first capacitive reactance device is connected to the first set power signal, and the second end of the first capacitive reactance device is electrically connected to the control end of the third switching device. connection.
进一步地,所述短路保护电路还包括:Further, the short-circuit protection circuit further includes:
第四开关电路,用于根据接收到的所述第一供电控制信号调节输出至所述供电模块的第二供电控制信号。The fourth switch circuit is configured to adjust the second power supply control signal output to the power supply module according to the received first power supply control signal.
进一步地,所述第四开关电路包括:Further, the fourth switch circuit includes:
第四开关器件,所述第四开关器件的控制端接入所述第一供电控制信号,所述第四开关器件的第一端接入第一设定电源信号;A fourth switching device, a control terminal of the fourth switching device is connected to the first power supply control signal, and a first terminal of the fourth switching device is connected to a first set power signal;
第五开关器件,所述第五开关器件的控制端与所述第四开关器件的第二端电连接,所述第五开关器件的第一端与所述供电模块的上电端电连接,所述第五开关器件的第二端与所述供电模块的第二供电控制端电连接并输出所述第二供电控控制信号。A fifth switching device, the control terminal of the fifth switching device is electrically connected to the second terminal of the fourth switching device, and the first terminal of the fifth switching device is electrically connected to the power-on terminal of the power supply module, The second terminal of the fifth switch device is electrically connected to the second power supply control terminal of the power supply module and outputs the second power supply control control signal.
进一步地,所述供电模块用于在检测到所述第二供电控制端接收到的第二供电控制信号的电压变化至设定电压时,通过所述上电端输出上电信号;Further, the power supply module is configured to output a power-on signal through the power-on terminal when detecting that the voltage of the second power-supply control signal received by the second power-supply control terminal changes to a set voltage;
所述短路保护电路还包括:The short-circuit protection circuit further includes:
上电电路,用于根据接收到的所述上电信号向所述供电模块的所述第二供电控制端上电。The power-on circuit is configured to power on the second power supply control terminal of the power supply module according to the received power-on signal.
进一步地,所述上电电路包括:Further, the power-on circuit includes:
第三分压器件,所述第三分压器件的第一端接入所述上电信号,所述第三分压器件的第二端与所述第四开关器件的控制端电连接;A third voltage dividing device, the first end of the third voltage dividing device is connected to the power-on signal, and the second end of the third voltage dividing device is electrically connected to the control end of the fourth switching device;
第二容抗器件,所述第二容抗器件的第一端与所述第四开关器件的控制端电连接,所述第二容抗器件的第二端接入所述第一设定电源信号。A second capacitive reactance device, the first end of the second capacitive reactance device is electrically connected to the control end of the fourth switching device, and the second end of the second capacitive reactance device is connected to the first set power supply signal.
本发明实施例提供了一种多路输出短路保护电路,设置多路输出短路保护电路包括供电模块、输入绕组和多个输出绕组,供电模块用于向输入绕组供电,输出绕组用于耦合输入绕组传输的电源信号并向对应的负载输出隔离电源信号,即利用输入绕组与输出绕组形成了变压器结构,相对于直接采用多个隔离电源模块驱动不同的负载有效降低了实现输出多路隔离电源的成本,且设置多路输出短路保护电路包括多个短路检测电路和一个短路保护电路,且多个短路检测电路用于根据对应的输出绕组输出的隔离电源信号调节输出的短路控制信号,短路保护电路用于根据所有短路检测电路输出的短路控制信号调节输出至供电模块的供电控制信号,以控制供电模块向输入绕组的供电状态,实现了输出绕组连接的负载存在短路情况时,短路检测电路能够准确检测到每一输出绕组电连接的负载是否存在短路的情况,进而通过短路保护电路在任意一个输出绕组电连接的负载存在短路情况时控制供电模块不再向输入绕组供电,即切断 供电模块的供电线路,实现了对每一路隔离电源输出支路的短路保护,降低了多路隔离电源信号输出线路中器件被烧毁的概率。The embodiment of the present invention provides a multi-output short-circuit protection circuit. The multi-output short-circuit protection circuit includes a power supply module, an input winding, and a plurality of output windings. The power supply module is used to supply power to the input winding, and the output winding is used to couple the input windings. The transmitted power signal is transmitted and the isolated power signal is output to the corresponding load, that is, the input winding and the output winding are used to form a transformer structure. Compared with directly using multiple isolated power modules to drive different loads, it effectively reduces the cost of implementing multiple isolated power supplies. , And set the multiple output short circuit protection circuit including multiple short circuit detection circuits and a short circuit protection circuit, and the multiple short circuit detection circuits are used to adjust the output short circuit control signal according to the isolated power signal output by the corresponding output winding, and the short circuit protection circuit is used According to the short circuit control signals output by all short circuit detection circuits, the power supply control signal output to the power supply module is adjusted to control the power supply state of the power supply module to the input winding, so that when the load connected to the output winding has a short circuit, the short circuit detection circuit can accurately detect Whether there is a short circuit in the load electrically connected to each output winding, and then control the power supply module to no longer supply power to the input winding when the load electrically connected to any output winding has a short circuit through the short-circuit protection circuit, that is, cut off the power supply line of the power supply module , It realizes the short-circuit protection of each isolated power output branch, and reduces the probability that the components in the multi-channel isolated power signal output circuit are burnt.
为了更清楚地说明本发明实施例或背景技术中的技术方案,下面将对实施例或背景技术描述中所需要使用的附图做一简单地介绍,显而易见地,下面描述中的附图是本发明的一些实施例的示意图,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的方案。In order to more clearly describe the technical solutions in the embodiments of the present invention or the background art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the background art. Obviously, the drawings in the following description are of the present invention. For the schematic diagrams of some embodiments of the invention, for those of ordinary skill in the art, other solutions can be obtained based on the drawings without creative work.
图1为本发明实施例提供的一种多路输出短路保护电路的结构示意图;FIG. 1 is a schematic structural diagram of a multi-output short-circuit protection circuit provided by an embodiment of the present invention;
图2为本发明实施例提供的一种短路检测电路的具体电路结构示意图;2 is a schematic diagram of a specific circuit structure of a short-circuit detection circuit provided by an embodiment of the present invention;
图3为本发明实施例提供的一种短路保护电路的具体电路结构示意图。FIG. 3 is a schematic diagram of a specific circuit structure of a short-circuit protection circuit provided by an embodiment of the present invention.
下面结合附图和实施例对本发明作进一步的详细说明。可以理解的是,此处所描述的具体实施例仅仅用于解释本发明,而非对本发明的限定。另外还需要说明的是,为了便于描述,附图中仅示出了与本发明相关的部分而非全部结构。贯穿本说明书中,相同或相似的附图标号代表相同或相似的结构、元件或流程。需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for ease of description, the drawings only show a part of the structure related to the present invention, but not all of the structure. Throughout this specification, the same or similar reference numerals represent the same or similar structures, elements or processes. It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other if there is no conflict.
图1为本发明实施例提供的一种多路输出短路保护电路的结构示意图。如图1所示,多路输出短路保护电路包括供电模块1、输入绕组2和多个输出绕组3,供电模块1用于向输入绕组2供电,输出绕组3用于耦合输入绕组2传 输的电源信号并向对应的负载(图1中未示出)输出隔离电源信号。多路输出短路保护电路还包括多个短路检测电路4和一个短路保护电路5,图1示例性地示出了多路输出短路保护电路包括三个输出绕组3,相应的多路输出短路保护电路包括三个短路检测电路4,短路检测电路4用于根据对应的输出绕组3输出的隔离电源信号调节输出的短路控制信号,短路保护电路5用于根据所有短路检测电路4输出的短路控制信号调节输出至供电模块1的供电控制信号,以控制供电模块1向输入绕组2的供电状态。FIG. 1 is a schematic structural diagram of a multi-output short-circuit protection circuit provided by an embodiment of the present invention. As shown in Figure 1, the multi-output short circuit protection circuit includes a power supply module 1, an input winding 2 and multiple output windings 3. The power supply module 1 is used to supply power to the input winding 2, and the output winding 3 is used to couple the power transmitted by the input winding 2. Signal and output an isolated power signal to the corresponding load (not shown in Figure 1). The multiple-output short-circuit protection circuit also includes multiple short-circuit detection circuits 4 and a short-circuit protection circuit 5. Figure 1 exemplarily shows that the multiple-output short-circuit protection circuit includes three output windings 3, and the corresponding multiple-output short-circuit protection circuit It includes three short-circuit detection circuits 4, the short-circuit detection circuit 4 is used to adjust the output short-circuit control signal according to the isolated power signal output by the corresponding output winding 3, and the short-circuit protection circuit 5 is used to adjust the short-circuit control signal output by all the short-circuit detection circuits 4 The power supply control signal output to the power supply module 1 is used to control the power supply state of the power supply module 1 to the input winding 2.
具体地,供电模块1用于向输入绕组2供电,供电模块1可以为供电芯片,供电模块1向输入绕组2通入供电信号,输出绕组3耦合输入绕组2传输的电源信号并向对应的负载输出隔离电源信号,可以设置输入绕组2与输出绕组3形成变压器结构,这样,相对于直接采用多个隔离电源模块驱动不同的负载,无需额外采用隔离电源模块,有效降低了实现输出多路隔离电源的成本。Specifically, the power supply module 1 is used to supply power to the input winding 2. The power supply module 1 may be a power supply chip. The power supply module 1 sends a power supply signal to the input winding 2, and the output winding 3 couples the power signal transmitted by the input winding 2 to the corresponding load. To output the isolated power signal, the input winding 2 and the output winding 3 can be set to form a transformer structure. In this way, compared to directly using multiple isolated power modules to drive different loads, no additional isolated power modules are needed, which effectively reduces the realization of multiple output isolated power supplies. the cost of.
另外,设置每个输出绕组3都配置有相应的短路检测电路4,任意一个输出绕组3电连接的负载如果出现短路问题,对应的输出绕组3输出的隔离电源信号的电压都会发生变化,短路检测电路4的端口B接入对于的输出绕组3输出的隔离电源信号,短路检测电路4检测到对应的隔离电源信号电压的变化则调节输出的短路控制信号的电压,所有短路检测电路4用于输出短路控制信号的端口A短接后连接至短路保护电路5,这样任意一个短路控制信号电压的变化都会被短路保护电路5侦测到,进而在短路保护电路5确认存在短路情况时调节输出的供电控制信号,以控制供电模块1不再向输入绕组2供电,实现了对每一路隔离电源输出支路的短路保护,进而降低了多路隔离电源信号输出线路中器件被烧毁的概率。In addition, each output winding 3 is configured with a corresponding short-circuit detection circuit 4. If a short-circuit problem occurs in the load electrically connected to any output winding 3, the voltage of the isolated power signal output by the corresponding output winding 3 will change, and short-circuit detection Port B of circuit 4 is connected to the isolated power supply signal output by the output winding 3. The short-circuit detection circuit 4 detects the change in the voltage of the corresponding isolated power supply signal and adjusts the voltage of the output short-circuit control signal. All short-circuit detection circuits 4 are used to output The port A of the short-circuit control signal is short-circuited and then connected to the short-circuit protection circuit 5, so that any change in the voltage of the short-circuit control signal will be detected by the short-circuit protection circuit 5, and the output power supply will be adjusted when the short-circuit protection circuit 5 confirms that there is a short circuit. The control signal is used to control the power supply module 1 to no longer supply power to the input winding 2, so as to realize the short-circuit protection of each isolated power output branch, thereby reducing the probability of the device in the multi-channel isolated power signal output line being burned.
图2为本发明实施例提供的一种短路检测电路的具体电路结构示意图,结合图1和图2,短路检测电路4包括第一开关电路41和第二开关电路42,第一开关电路41用于根据接收到的对应的输出绕组3输出的隔离电源信号调节输出的第一开关控制信号,第二开关电路42用于根据接收到的第一开关控制信号调节输出的短路控制信号。2 is a schematic diagram of a specific circuit structure of a short-circuit detection circuit provided by an embodiment of the present invention. With reference to FIGS. 1 and 2, the short-circuit detection circuit 4 includes a first switch circuit 41 and a second switch circuit 42, the first switch circuit 41 uses In order to adjust the output first switch control signal according to the received isolated power supply signal output by the corresponding output winding 3, the second switch circuit 42 is used to adjust the output short-circuit control signal according to the received first switch control signal.
具体地,以第一个短路检测电路4为例,短路检测电路4中的第一开关电路41接收第一个输出绕组3输出的隔离电源信号,当第一个输出绕组3电连接的负载发生短路时,第一开关电路41由端口B接收到的隔离电源信号的电压发生变化,导致第一开关电路41的开关状态发生变化,第一开关电路41输出的第一开关控制信号的电平高低发生变化,进而导致第二开关电路42的开关状态发生变化,第二开关电路42输出的短路控制信号的电平高低发生变化,短路保护电路5侦测到短路控制信号的电平高低的变化则可以控制供电模块1不再向输入绕组2供电,实现短路保护。Specifically, taking the first short-circuit detection circuit 4 as an example, the first switch circuit 41 in the short-circuit detection circuit 4 receives the isolated power signal output by the first output winding 3, and when the load electrically connected to the first output winding 3 occurs When a short circuit occurs, the voltage of the isolated power signal received by the first switch circuit 41 from port B changes, which causes the switch state of the first switch circuit 41 to change, and the level of the first switch control signal output by the first switch circuit 41 is high or low. The change occurs, which in turn causes the switching state of the second switch circuit 42 to change, the level of the short-circuit control signal output by the second switch circuit 42 changes, and the short-circuit protection circuit 5 detects the change in the level of the short-circuit control signal. The power supply module 1 can be controlled to no longer supply power to the input winding 2, so as to realize short-circuit protection.
可选地,结合图1和图2,第一开关电路41包括第一分压器件R1、第二分压器件R2和第一开关器件K1,第一分压器件R1的第一端接入隔离电源信号,第一分压器件R1的第二端与第二分压器件R2的第一端电连接,第二分压器件R2的第二端接入第一设定电源信号,第一设定电源信号例如可以为地信号,第一分压器件R1和第二分压器件R2例如可以为电阻元件,实现对接入的隔离电源信号的分压,当隔离电源信号的电压发生变化时,分压节点输出的分压信号的电压也发生变化。Optionally, with reference to FIGS. 1 and 2, the first switching circuit 41 includes a first voltage dividing device R1, a second voltage dividing device R2, and a first switching device K1, and the first end of the first voltage dividing device R1 is connected to the isolation Power signal, the second end of the first voltage divider R1 is electrically connected to the first end of the second voltage divider R2, the second end of the second voltage divider R2 is connected to the first set power signal, the first set The power signal can be, for example, a ground signal, and the first voltage dividing device R1 and the second voltage dividing device R2 can be, for example, resistive elements to realize the voltage division of the connected isolated power signal. When the voltage of the isolated power signal changes, the voltage of the isolated power signal is divided. The voltage of the divided voltage signal output by the voltage node also changes.
第一开关器件K1的控制端,即图2中K1右侧端口与第一分压器件R1的第二端电连接,第一开关器件K1的第一端接入第一设定电源信号,例如地信 号,第一开关器件K1的第二端用于输出第一开关控制信号,第一开关器件K1例如可以为绝缘栅型场效应管,即MOS管,或者为三极管,即BJT管,第一开关器件K1也可以如图2所示为带有控制功能的二极管,二极管根据右侧控制端输入的分压信号导通或截止,实现第一开关电路41输出的第一开关控制信号的电平高的调节。The control terminal of the first switching device K1, that is, the right port of K1 in FIG. 2, is electrically connected to the second terminal of the first voltage divider R1, and the first terminal of the first switching device K1 is connected to the first set power signal, for example Ground signal, the second terminal of the first switching device K1 is used to output the first switching control signal, the first switching device K1 may be, for example, an insulated gate field effect transistor, that is, a MOS tube, or a triode, that is, a BJT tube. The switching device K1 may also be a diode with a control function as shown in FIG. 2. The diode is turned on or off according to the divided voltage signal input from the right control terminal to realize the level of the first switching control signal output by the first switching circuit 41 High adjustment.
第二开关电路42包括发光器件D1和光敏器件T1,发光器件D1的第一端接入第二设定电源信号,例如VDD信号,发光器件D1的第二端接入第一开关控制信号,即与第一开关器件K1的第二端电连接,光敏器件T1的第一端接入第一设定电源信号,例如地信号,光敏器件T1的第二端用于输出短路控制信号。发光器件D1例如可以为发光二极管,光敏器件T1例如可以为光敏晶体管,发光器件D1根据第一开关电路41输出的第一开关控制信号控制其自身导通或者关断,发光器件D1导通时发光,光敏器件T1感光导通,可以设置光敏器件T1的第一端接入的第一设定电源信号为地信号,则光敏器件T1的第二端输出的短路控制信号为低电平信号,相反,若发光器件D1关断不发光,光敏器件T1的第二端输出的短路控制信号为高电平信号,短路保护电路5侦测到短路控制信号的电平高低的变化则可以控制供电模块1不再向输入绕组2供电,实现短路保护。The second switch circuit 42 includes a light emitting device D1 and a photosensitive device T1. The first end of the light emitting device D1 is connected to a second set power signal, such as a VDD signal, and the second end of the light emitting device D1 is connected to the first switch control signal, namely It is electrically connected to the second terminal of the first switching device K1, the first terminal of the photosensitive device T1 is connected to a first set power signal, such as a ground signal, and the second terminal of the photosensitive device T1 is used to output a short circuit control signal. The light-emitting device D1 may be, for example, a light-emitting diode, and the photosensitive device T1 may be, for example, a phototransistor. The light-emitting device D1 controls itself to be turned on or off according to the first switch control signal output by the first switch circuit 41, and emits light when the light-emitting device D1 is turned on. , The photosensitive device T1 is light-sensitive, and the first set power signal connected to the first end of the photosensitive device T1 can be set to the ground signal, then the short-circuit control signal output by the second end of the photosensitive device T1 is a low-level signal, on the contrary If the light-emitting device D1 is turned off and does not emit light, the short-circuit control signal output by the second end of the photosensitive device T1 is a high-level signal, and the short-circuit protection circuit 5 detects the change in the level of the short-circuit control signal and can control the power supply module 1. No longer supply power to the input winding 2, realizing short-circuit protection.
图3为本发明实施例提供的一种短路保护电路的具体电路结构示意图。结合图1至图3,短路保护电路5包括第三开关电路51,第三开关电路51用于根据接收到的短路控制信号,即端口A输入的短路控制信号调节输出至供电模块1的第一供电控制信号,即通过第一供电控制端COM输出的第一供电控制信号,第三开关电路51的端口A与所有短路检测电路4的短接端口A电连接,第三 开关电路51可以根据端口A接收到的短路控制信号的电平高低调节输出至供电模块1的第一供电控制信号的电平高低,供电模块1在接收到的第一供电控制信号的电平高低不同时控制是否向输入绕组2供电。FIG. 3 is a schematic diagram of a specific circuit structure of a short-circuit protection circuit provided by an embodiment of the present invention. 1 to 3, the short-circuit protection circuit 5 includes a third switch circuit 51, and the third switch circuit 51 is used to adjust the first output to the power supply module 1 according to the received short-circuit control signal, that is, the short-circuit control signal input from port A. The power supply control signal, that is, the first power supply control signal output through the first power supply control terminal COM, the port A of the third switch circuit 51 is electrically connected to the short-circuit ports A of all the short-circuit detection circuits 4, and the third switch circuit 51 can be based on the port A. The level of the received short-circuit control signal adjusts the level of the first power supply control signal output to the power supply module 1. The power supply module 1 controls whether to input when the level of the received first power supply control signal is different Winding 2 supplies power.
可选地,结合图1至图3,第三开关电路51包括第三开关器件K3,第三开关器件K3的控制端接入短路控制信号,第三开关器件K3的第一端接入第一设定电源信号,例如地信号,第三开关器件K3的第二端与供电模块1的第一供电控制端COM电连接并输出第一供电控制信号。Optionally, in conjunction with FIGS. 1 to 3, the third switch circuit 51 includes a third switch device K3, the control terminal of the third switch device K3 is connected to the short-circuit control signal, and the first terminal of the third switch device K3 is connected to the first terminal. Setting a power signal, such as a ground signal, the second end of the third switching device K3 is electrically connected to the first power supply control terminal COM of the power supply module 1 and outputs the first power supply control signal.
具体地,第三开关器件K3可以为绝缘栅型场效应管,即MOS管,或者为三极管,即BJT管,第三开关器件K3的控制端根据接收到的短路控制信号控制其自身的第一端与第二端是否连通,第三开关器件K3的第一端接入的第一设定电源信号例如可以为接地信号,若第三开关器件K3导通,则第三开关器件K3的第二端输出至供电模块1的第一供电控制端COM的第一供电控制信号为低电平信号。若第三开关器件K3关断,则第三开关器件K3的第二端输出至供电模块1的第一供电控制端COM的第一供电控制信号为高电平信号。可以设置负载是否存在短路情况对应的短路检测电路4输出的短路控制信号的电平高低不同,进而控制第三开关器件K3的开关状态不同,供电模块1的第一供电控制端COM接收到短路有效信号(高电平信号或者低电平信号)时不再向输入线组供电,实现短路保护。Specifically, the third switching device K3 may be an insulated gate field effect transistor, that is, a MOS tube, or a triode, that is, a BJT tube. The control terminal of the third switching device K3 controls its own first control signal according to the received short-circuit control signal. Whether the terminal is connected to the second terminal, the first set power signal connected to the first terminal of the third switching device K3 may be, for example, a ground signal. If the third switching device K3 is turned on, the second terminal of the third switching device K3 The first power supply control signal output to the first power supply control terminal COM of the power supply module 1 is a low-level signal. If the third switching device K3 is turned off, the first power supply control signal output from the second terminal of the third switching device K3 to the first power supply control terminal COM of the power supply module 1 is a high-level signal. The level of the short circuit control signal output by the short-circuit detection circuit 4 corresponding to whether the load has a short-circuit condition can be set to be different, thereby controlling the switching state of the third switching device K3 to be different, and the first power supply control terminal COM of the power supply module 1 receives the short-circuit valid Signal (high-level signal or low-level signal) no longer supplies power to the input line group, realizing short-circuit protection.
可选地,结合图1至图3,第三开关电路51还包括第一容抗器件C1,第一容抗器件C1的第一端接入第一设定电源信号,例如地信号,第一容抗器件C1的第二端与第三开关器件K3的控制端电连接。Optionally, with reference to FIGS. 1 to 3, the third switch circuit 51 further includes a first capacitive reactance device C1, and a first end of the first capacitive reactance device C1 is connected to a first set power signal, such as a ground signal, The second end of the capacitive reactance device C1 is electrically connected to the control end of the third switching device K3.
具体地,第一容抗器件C1可以为电容元件,第一容抗器件C1连接地信号 GND至第三开关器件K3的控制端,短路检测电路4中的光敏器件T1用于输出短路控制信号的第二端还可以通过电阻元件连接至供电模块1的第二供电控制端POW1,即供电模块的供电端。可以设置当输出绕组3连接的负载存在短路时,对应的输出至第一开关器件K1的分压信号为低电平信号,第一开关器件K1关断,光耦中的发光器件D1不发光,光敏器件T1的第一端和第二端断开连接。在上电建立时,即供电模块1刚开始向输入绕组2供电,由于输出绕组3输出的隔离电源信号的电压接近于0V,按照前述对应存在短路情况的描述,在上电建立时并没有短路情况的发生,但同样会误触发短路保护。Specifically, the first capacitive reactance device C1 may be a capacitive element, the first capacitive reactance device C1 is connected to the ground signal GND to the control terminal of the third switching device K3, and the photosensitive device T1 in the short circuit detection circuit 4 is used to output a short circuit control signal. The second terminal may also be connected to the second power supply control terminal POW1 of the power supply module 1, that is, the power supply terminal of the power supply module, through a resistance element. It can be set that when the load connected to the output winding 3 has a short circuit, the corresponding divided voltage signal output to the first switching device K1 is a low-level signal, the first switching device K1 is turned off, and the light-emitting device D1 in the optocoupler does not emit light. The first end and the second end of the photosensitive device T1 are disconnected. When the power is established, that is, the power supply module 1 just starts to supply power to the input winding 2. Since the voltage of the isolated power signal output by the output winding 3 is close to 0V, according to the aforementioned description of the corresponding short-circuit condition, there is no short-circuit when the power is established The situation occurs, but the short-circuit protection will also be triggered by mistake.
本发明实施例通过设置第三开关电路51还包括第一容抗器件C1,第一容抗器件C1的第一端接入第一设定电源信号,第一容抗器件C1的第二端与第三开关器件K3的控制端电连接,使得第三开关器件K3的控制端的电位缓慢上升,不会在上电建立时直接触发短路保护,进而避免了上电建立导致的短路保护误触发的问题。The embodiment of the present invention further includes a first capacitive reactance device C1 by setting the third switch circuit 51, the first end of the first capacitive reactance device C1 is connected to the first set power signal, and the second end of the first capacitive reactance device C1 is connected to The control terminal of the third switching device K3 is electrically connected, so that the potential of the control terminal of the third switching device K3 rises slowly, and the short circuit protection will not be directly triggered when the power is established, thereby avoiding the problem of false triggering of the short circuit protection caused by the power establishment. .
可选地,结合图1至图3,短路保护电路5还包括第四开关电路52,第四开关电路52用于根据接收到的第一供电控制信号,即输出至第一供电控制端COM的信号调节输出至供电模块1的第二供电控制信号,可以在输出绕组3电连接的负载存在短路情况时,通过第一供电控制信号,即供电模块的使能信号控制供电模块1停止供电的同时,利用第四开关器件K4输出的第二供电控制信号,即输出至供电模块1的第二供电控制端POW1的信号同样能够控制供电模块1停止供电,利用双重短路保护机制提高电路实现短路保护功能的准确性。Optionally, in conjunction with FIGS. 1 to 3, the short-circuit protection circuit 5 further includes a fourth switch circuit 52, and the fourth switch circuit 52 is configured to output to the first power supply control terminal COM according to the received first power supply control signal The signal adjusts the second power supply control signal output to the power supply module 1. When the load electrically connected to the output winding 3 is short-circuited, the first power supply control signal, that is, the enable signal of the power supply module, can control the power supply module 1 to stop power supply at the same time. , The second power supply control signal output by the fourth switching device K4, that is, the signal output to the second power supply control terminal POW1 of the power supply module 1, can also control the power supply module 1 to stop power supply, and the double short circuit protection mechanism is used to improve the circuit to realize the short circuit protection function Accuracy.
可选地,结合图1至图3,第四开关电路52包括第四开关器件K4和第五开关器件K5,第四开关器件K4的控制端接入第一供电控制信号,第四开关器 件K4的第一端接入第一设定电源信号,第五开关器件K5的控制端与第四开关器件K4的第二端电连接,第五开关器件K5的第一端与供电模块1的上电端POW电连接,第五开关器件K5的第二端与供电模块1的第二供电控制端POW1电连接并输出第二供电控控制信号。Optionally, with reference to FIGS. 1 to 3, the fourth switch circuit 52 includes a fourth switch device K4 and a fifth switch device K5, the control terminal of the fourth switch device K4 is connected to the first power supply control signal, and the fourth switch device K4 The first end of the fifth switch device K5 is connected to the first set power signal, the control end of the fifth switch device K5 is electrically connected to the second end of the fourth switch device K4, and the first end of the fifth switch device K5 is connected to the power-on of the power supply module 1. The terminal POW is electrically connected, and the second terminal of the fifth switching device K5 is electrically connected with the second power supply control terminal POW1 of the power supply module 1 and outputs a second power supply control control signal.
具体地,第四开关器件K4和第五开关器件K5可以为绝缘栅型场效应管,即MOS管,也可以为三极管,即BJT管,当第四开关器件K4接入的第一供电控制信号对应负载是否存在短路情况时的电平高低不同,进而使得第四开关器件K4的开关状态不同,使得第五开关器件K5的控制端接入的开关控制信号的电平高低也不同,第五开关器件K5的开关状态不同,可以在短路存在时控制第五开关器件K5关断,供电模块1的上电端POW与第二供电控制端POW1断开连接,第二供电控制端POW1端的第二供电控制信号为低电平信号,供电模块1停止供电。Specifically, the fourth switching device K4 and the fifth switching device K5 may be insulated gate type field effect transistors, that is, MOS transistors, or triodes, that is, BJT tubes. When the fourth switching device K4 is connected to the first power supply control signal Corresponding to whether the load has a short-circuit condition, the level is different, so that the switching state of the fourth switching device K4 is different, so that the level of the switching control signal connected to the control end of the fifth switching device K5 is also different, the fifth switch The switching state of the device K5 is different. The fifth switching device K5 can be controlled to be turned off when a short circuit exists. The power-on terminal POW of the power supply module 1 is disconnected from the second power supply control terminal POW1, and the second power supply control terminal POW1 is the second power supply The control signal is a low-level signal, and the power supply module 1 stops supplying power.
可选地,结合图1至图3,供电模块1用于在检测到第二供电控制端POW1接收到的第二供电控制信号的电压变化至设定电压时,通过上电端POW输出上电信号,短路保护电路5还包括上电电路53,用于根据接收到的上电信号向供电模块1的第二供电控制端POW1上电,可以设置上电电路53包括第三分压器件R3和第二容抗器件C2,第三分压器件R3的第一端接入上电信号,第三分压器件R3的第二端与第四开关器件K4的控制端电连接,第二容抗器件C2的第一端与第四开关器件K4的控制端电连接,第二容抗器件C2的第二端接入第一设定电源信号,例如地信号。Optionally, in conjunction with FIGS. 1 to 3, the power supply module 1 is configured to output power-on through the power-on terminal POW when detecting that the voltage of the second power-supply control signal received by the second power-supply control terminal POW1 has changed to a set voltage Signal, the short-circuit protection circuit 5 also includes a power-on circuit 53 for powering on the second power supply control terminal POW1 of the power supply module 1 according to the received power-on signal. The power-on circuit 53 can be set to include a third voltage divider R3 and The second capacitive reactance device C2, the first end of the third voltage dividing device R3 is connected to the power-on signal, the second end of the third voltage dividing device R3 is electrically connected to the control end of the fourth switching device K4, and the second capacitive reactance device The first end of C2 is electrically connected to the control end of the fourth switching device K4, and the second end of the second capacitive reactance device C2 is connected to a first set power signal, such as a ground signal.
具体地,由于供电模块1的第二供电控制端POW1对应的引脚具有一定容性,在短路发生后第二供电控制端POW1接收到的第二供电控制信号的电压降 到0V时,短路保护过程才会结束,供电模块1则在检测到第二供电控制端POW1接收到的第二供电控制信号的电压变化至设定电压,例如0V时,通过上电端POW输出上电信号,即重新给供电模块1上电,上电端POW输出的上电信号通过第三分压器件R3与第二容抗器件C2,使得在短路保护时关断的第四开关器件K4重新导通,进而使得第五开关器件K5导通,供电模块1的上电端POW与供电模块1的第二供电控制端POW1连通,第二供电控制端POW1重新接收到高电平的第二供电控制信号,供电模块1可以继续向输入绕组2供电,即整个电路在短路发生时可以进行短路保护以使供电模块1与输入绕组2之间的供电线路断开,断电后又能够利用供电模块1内部的反馈机制自动对供电模块1上电,实现打嗝短路保护。Specifically, since the pin corresponding to the second power supply control terminal POW1 of the power supply module 1 has a certain capacitance, when the voltage of the second power supply control signal received by the second power supply control terminal POW1 drops to 0V after the occurrence of a short circuit, the short circuit protection The process will end, and when the power supply module 1 detects that the voltage of the second power supply control signal received by the second power supply control terminal POW1 has changed to the set voltage, for example, 0V, it outputs the power-on signal through the power-on terminal POW, that is, restarts Power on the power supply module 1, and the power-on signal output by the power-on terminal POW passes through the third voltage divider R3 and the second capacitive reactance device C2, so that the fourth switching device K4 that is turned off during short-circuit protection is turned on again, thereby making The fifth switching device K5 is turned on, the power-on terminal POW of the power supply module 1 is connected to the second power supply control terminal POW1 of the power supply module 1, and the second power supply control terminal POW1 receives the high-level second power supply control signal again, and the power supply module 1 can continue to supply power to the input winding 2, that is, the entire circuit can be short-circuit protected when a short circuit occurs to disconnect the power supply line between the power supply module 1 and the input winding 2, and the feedback mechanism inside the power supply module 1 can be used after the power is off The power supply module 1 is automatically powered on to realize hiccup short-circuit protection.
下面结合图1至图3对多路输出短路保护电路的工作原理进行整体说明:The working principle of the multi-output short-circuit protection circuit will be described as a whole with reference to Figures 1 to 3 below:
所有短路检测电路4之间的关系为“或”关,即任意一个短路检测支路检测到对应的负载存在短路情况时则输出控制短路保护电路5进行短路保护的短路控制信号。The relationship between all short-circuit detection circuits 4 is “OR” off, that is, when any short-circuit detection branch detects a short-circuit condition of the corresponding load, it outputs a short-circuit control signal for controlling the short-circuit protection circuit 5 to perform short-circuit protection.
短路检测电路4首先通过分压器件检测接入的隔离电源信号电压的变化,如果负载发生短路,隔离电源信号的电压会下降,当隔离电源信号的电压下降至小于等于设定检测电压时则可以控制第一开关器件K1断开,进而控制发光器件D1不发光,光敏器件T1输出高电平,进而控制第三开关器件导通,供电模块的第一供电控制端COM接收到低电平的第一供电控制信号。同时,第四开关器件K4在低电平的第一供电控制信号的作用下关断,第五开关器件K5关断,POW1接收到低电平的第二供电控制信号,进而利用双重短路保护机制实现短路保护。The short-circuit detection circuit 4 first detects the change in the voltage of the connected isolated power signal through the voltage divider. If the load is short-circuited, the voltage of the isolated power signal will drop. When the voltage of the isolated power signal drops to less than or equal to the set detection voltage, it can Control the first switching device K1 to turn off, and then control the light-emitting device D1 to not emit light, the photosensitive device T1 to output a high level, and then control the third switching device to turn on, and the first power supply control terminal COM of the power supply module receives the low-level first A power supply control signal. At the same time, the fourth switching device K4 is turned off under the action of the low-level first power supply control signal, the fifth switching device K5 is turned off, and POW1 receives the low-level second power supply control signal, and then uses the double short circuit protection mechanism Realize short circuit protection.
另外,利用上述多路输出短路保护电路还可以实现过流保护,例如可以设置在输出绕组3输出的隔离电源信号的电流值过大时同样降低第一分压器件R1和第二分压器件R2的分压电压,利用上述短路保护原理实现过流保护。In addition, the above multiple output short circuit protection circuit can also be used to achieve overcurrent protection. For example, it can be set to reduce the first voltage divider R1 and the second voltage divider R2 when the current value of the isolated power signal output by the output winding 3 is too large. Using the above-mentioned short-circuit protection principle to achieve over-current protection.
需要说明的是,本发明实施例对多路输出短路保护电路中的开关是高电平控制导通还是低电平控制导通并不限定,可以根据实现短路保护的功能设置相应的开关有效信号为高电平信号或者低电平信号。It should be noted that the embodiment of the present invention does not limit whether the switch in the multi-output short-circuit protection circuit is high-level controlled conduction or low-level control conduction. The corresponding switch valid signal can be set according to the function of realizing short-circuit protection. It is a high-level signal or a low-level signal.
本发明实施例利用输入绕组与输出绕组形成了变压器结构,相对于直接采用多个隔离电源模块驱动不同的负载有效降低了实现输出多路隔离电源的成本,实现了输出绕组连接的负载存在短路情况时,短路检测电路能够准确检测到每一输出绕组电连接的负载是否存在短路的情况,进而通过短路保护电路在任意一个输出绕组电连接的负载存在短路情况时控制供电模块不再向输入绕组供电,即切断供电模块的供电线路,实现了对每一路隔离电源输出支路的短路保护,降低了多路隔离电源信号输出线路中器件被烧毁的概率。The embodiment of the present invention utilizes the input winding and the output winding to form a transformer structure. Compared with directly using multiple isolated power modules to drive different loads, the cost of realizing output multi-channel isolated power supplies is effectively reduced, and the load connected to the output windings is short-circuited. When the short circuit detection circuit can accurately detect whether there is a short circuit in the load electrically connected to each output winding, the short circuit protection circuit can control the power supply module to no longer supply power to the input winding when there is a short circuit in any load electrically connected to the output winding. , That is, cut off the power supply circuit of the power supply module, realize the short-circuit protection of each isolated power output branch, and reduce the probability of the device in the multi-channel isolated power signal output line being burned.
注意,上述仅为本发明的较佳实施例及所运用技术原理。本领域技术人员会理解,本发明不限于这里的特定实施例,对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本发明的保护范围。因此,虽然通过以上实施例对本发明进行了较为详细的说明,但是本发明不仅仅限于以上实施例,在不脱离本发明构思的情况下,还可以包括更多其他等效实施例,而本发明的范围由所附的权利要求范围决定。Note that the above are only the preferred embodiments of the present invention and the applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and various obvious changes, readjustments and substitutions can be made to those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope of is determined by the scope of the appended claims.
Claims (10)
- 一种多路输出短路保护电路,其特征在于,包括:A multi-output short-circuit protection circuit, which is characterized in that it comprises:供电模块、输入绕组和多个输出绕组,所述供电模块用于向所述输入绕组供电,所述输出绕组用于耦合所述输入绕组传输的电源信号并向对应的负载输出隔离电源信号;A power supply module, an input winding and a plurality of output windings, the power supply module is used to supply power to the input winding, and the output winding is used to couple the power signal transmitted by the input winding and output an isolated power signal to a corresponding load;多个短路检测电路,用于根据对应的所述输出绕组输出的隔离电源信号调节输出的短路控制信号;A plurality of short-circuit detection circuits for adjusting the output short-circuit control signal according to the isolated power signal output by the corresponding output winding;短路保护电路,用于根据所有所述短路检测电路输出的所述短路控制信号调节输出至所述供电模块的供电控制信号,以控制所述供电模块向所述输入绕组的供电状态。The short circuit protection circuit is used to adjust the power supply control signal output to the power supply module according to the short circuit control signals output by all the short circuit detection circuits, so as to control the power supply state of the power supply module to the input winding.
- 根据权利要求1所述的多路输出短路保护电路,其特征在于,所述短路检测电路包括:The multi-output short-circuit protection circuit according to claim 1, wherein the short-circuit detection circuit comprises:第一开关电路,用于根据接收到的对应的所述输出绕组输出的隔离电源信号调节输出的第一开关控制信号;The first switch circuit is configured to adjust the output first switch control signal according to the received isolated power supply signal output by the corresponding output winding;第二开关电路,用于根据接收到的所述第一开关控制信号调节输出的所述短路控制信号。The second switch circuit is configured to adjust the output short-circuit control signal according to the received first switch control signal.
- 根据权利要求2所述的多路输出短路保护电路,其特征在于,所述第一开关电路包括:The multi-output short-circuit protection circuit according to claim 2, wherein the first switch circuit comprises:第一分压器件和第二分压器件,所述第一分压器件的第一端接入所述隔离电源信号,所述第一分压器件的第二端与所述第二分压器件的第一端电连接,所述第二分压器件的第二端接入第一设定电源信号;A first voltage dividing device and a second voltage dividing device, the first end of the first voltage dividing device is connected to the isolated power signal, and the second end of the first voltage dividing device is connected to the second voltage dividing device Is electrically connected to the first end, and the second end of the second voltage divider is connected to the first set power signal;第一开关器件,所述第一开关器件的控制端与所述第一分压器件的第二端电连接,所述第一开关器件的第一端接入所述第一设定电源信号,所述第一开 关器件的第二端用于输出所述第一开关控制信号;A first switching device, the control terminal of the first switching device is electrically connected to the second terminal of the first voltage dividing device, and the first terminal of the first switching device is connected to the first set power signal, The second terminal of the first switch device is used to output the first switch control signal;所述第二开关电路包括:The second switch circuit includes:发光器件,所述发光器件的第一端接入第二设定电源信号,所述发光器件的第二端接入所述第一开关控制信号;A light emitting device, a first end of the light emitting device is connected to a second set power signal, and a second end of the light emitting device is connected to the first switch control signal;光敏器件,所述光敏器件的第一端接入所述第一设定电源信号,所述光敏器件的第二端用于输出所述短路控制信号。A photosensitive device, the first end of the photosensitive device is connected to the first set power signal, and the second end of the photosensitive device is used to output the short-circuit control signal.
- 根据权利要求1所述的多路输出短路保护电路,其特征在于,所述短路保护电路包括:The multi-output short-circuit protection circuit according to claim 1, wherein the short-circuit protection circuit comprises:第三开关电路,用于根据接收到的所述短路控制信号调节输出至所述供电模块的第一供电控制信号。The third switch circuit is configured to adjust the first power supply control signal output to the power supply module according to the received short-circuit control signal.
- 根据权利要求4所述的多路输出短路保护电路,其特征在于,所述第三开关电路包括:The multi-output short-circuit protection circuit according to claim 4, wherein the third switch circuit comprises:第三开关器件,所述第三开关器件的控制端接入所述短路控制信号,所述第三开关器件的第一端接入第一设定电源信号,所述第三开关器件的第二端与所述供电模块的第一供电控制端电连接并输出所述第一供电控制信号。The third switch device, the control terminal of the third switch device is connected to the short circuit control signal, the first terminal of the third switch device is connected to the first set power signal, and the second terminal of the third switch device is connected to the first set power signal. The terminal is electrically connected to the first power supply control terminal of the power supply module and outputs the first power supply control signal.
- 根据权利要求5所述的多路输出短路保护电路,其特征在于,所述第三开关电路还包括:The multi-output short-circuit protection circuit according to claim 5, wherein the third switch circuit further comprises:第一容抗器件,所述第一容抗器件的第一端接入所述第一设定电源信号,所述第一容抗器件的第二端与所述第三开关器件的控制端电连接。The first capacitive reactance device, the first end of the first capacitive reactance device is connected to the first set power signal, and the second end of the first capacitive reactance device is electrically connected to the control end of the third switching device. connection.
- 根据权利要求4-6任一项所述的多路输出短路保护电路,其特征在于,所述短路保护电路还包括:The multi-output short-circuit protection circuit according to any one of claims 4-6, wherein the short-circuit protection circuit further comprises:第四开关电路,用于根据接收到的所述第一供电控制信号调节输出至所述 供电模块的第二供电控制信号。The fourth switch circuit is used to adjust the second power supply control signal output to the power supply module according to the received first power supply control signal.
- 根据权利要求7所述的多路输出短路保护电路,其特征在于,所述第四开关电路包括:The multi-output short-circuit protection circuit according to claim 7, wherein the fourth switch circuit comprises:第四开关器件,所述第四开关器件的控制端接入所述第一供电控制信号,所述第四开关器件的第一端接入第一设定电源信号;A fourth switching device, a control terminal of the fourth switching device is connected to the first power supply control signal, and a first terminal of the fourth switching device is connected to a first set power signal;第五开关器件,所述第五开关器件的控制端与所述第四开关器件的第二端电连接,所述第五开关器件的第一端与所述供电模块的上电端电连接,所述第五开关器件的第二端与所述供电模块的第二供电控制端电连接并输出所述第二供电控控制信号。A fifth switching device, the control terminal of the fifth switching device is electrically connected to the second terminal of the fourth switching device, and the first terminal of the fifth switching device is electrically connected to the power-on terminal of the power supply module, The second terminal of the fifth switch device is electrically connected to the second power supply control terminal of the power supply module and outputs the second power supply control control signal.
- 根据权利要求8所述的多路输出短路保护电路,其特征在于,所述供电模块用于在检测到所述第二供电控制端接收到的第二供电控制信号的电压变化至设定电压时,通过所述上电端输出上电信号;The multi-output short-circuit protection circuit according to claim 8, wherein the power supply module is configured to detect that the voltage of the second power supply control signal received by the second power supply control terminal changes to a set voltage , Output a power-on signal through the power-on terminal;所述短路保护电路还包括:The short-circuit protection circuit further includes:上电电路,用于根据接收到的所述上电信号向所述供电模块的所述第二供电控制端上电。The power-on circuit is configured to power on the second power supply control terminal of the power supply module according to the received power-on signal.
- 根据权利要求9所述的多路输出短路保护电路,其特征在于,所述上电电路包括:The multi-output short-circuit protection circuit according to claim 9, wherein the power-on circuit comprises:第三分压器件,所述第三分压器件的第一端接入所述上电信号,所述第三分压器件的第二端与所述第四开关器件的控制端电连接;A third voltage dividing device, the first end of the third voltage dividing device is connected to the power-on signal, and the second end of the third voltage dividing device is electrically connected to the control end of the fourth switching device;第二容抗器件,所述第二容抗器件的第一端与所述第四开关器件的控制端电连接,所述第二容抗器件的第二端接入所述第一设定电源信号。A second capacitive reactance device, the first end of the second capacitive reactance device is electrically connected to the control end of the fourth switching device, and the second end of the second capacitive reactance device is connected to the first set power supply signal.
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