CN216290670U - Quick start low-power consumption power supply circuit and circuit breaker - Google Patents
Quick start low-power consumption power supply circuit and circuit breaker Download PDFInfo
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- CN216290670U CN216290670U CN202122495461.9U CN202122495461U CN216290670U CN 216290670 U CN216290670 U CN 216290670U CN 202122495461 U CN202122495461 U CN 202122495461U CN 216290670 U CN216290670 U CN 216290670U
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Abstract
A fast start low-power consumption power supply circuit and a breaker comprise an input power supply, a limiting circuit, a switching circuit and an adjusting circuit which are sequentially connected, wherein the switching circuit comprises a flyback switching power supply which comprises a high-frequency transformer, a power supply chip, a starting diode and a starting capacitor, the power supply chip controls the high-frequency transformer to start and stop supplying power, a VCC (voltage to current converter) port at the output side of the power supply chip is connected with the starting capacitor, the anode of the starting diode is connected with a secondary winding of the high-frequency transformer, the cathode of the starting diode is connected between the VCC port of the power supply chip and the starting capacitor, and the secondary winding of the high-frequency transformer is connected with the VCC port of the power supply chip and the starting capacitor through the starting diode and is used for supplying power to the power supply chip and charging the starting capacitor; and a regulating capacitor of the regulating circuit supplies power to the load side when the flyback switching power supply is not started. The utility model is beneficial to reducing the power consumption in the standby sleep state and can be quickly started in normal voltage.
Description
Technical Field
The utility model relates to the field of low-voltage appliances, in particular to a quick-start low-power-consumption power circuit and a breaker.
Background
The rapid development of the existing electronic technology, the external circuit breaker of the electric energy meter and the electric energy meter are matched in a wireless Bluetooth control mode, the external circuit breaker of the electric energy meter is called Bluetooth micro-breaker for short, the requirement on the power consumption of the Bluetooth micro-breaker in the using process is special, the Bluetooth micro-breaker needs to meet the requirement that extra cost cannot be generated for users in the range of wide voltage (AC 110V-AC 300V) range, meanwhile, the standby static power consumption needs to be less than 800uA, therefore, when three-phase Bluetooth micro-breaker is used for single-phase power supply or three-phase power supply, the static power consumption of each phase standby machine is less than 800uA, the design difficulty is large in principle and PCB design space, and the realization is difficult. A power supply circuit of an external circuit breaker of an existing electric energy meter adopts a special AC-DC power supply chip flyback switching circuit to achieve ultra-low power consumption, a high-voltage power MOS tube is integrated in the chip, a zero standby mode can be provided, in a low-voltage working environment, in the process of switching on and off of Bluetooth micro-disconnection, the power consumption of the power supply can be increased due to the fact that the low voltage is the same as the load under the rated voltage, when the low-voltage AC110V works, the low voltage of the power supply chip can be protected with load, and the three-phase Bluetooth micro-disconnection and switching-on can not be normally achieved.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a quick-starting low-power-consumption power circuit and a breaker with low power consumption and high starting speed.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a quick start low-power consumption power supply circuit, includes input power, limiting circuit, switch circuit and the regulating circuit who connects gradually, its characterized in that:
the limiting circuit comprises at least one group of limiting branches connected with an input power supply, and each limiting branch comprises a self-recovery switching tube and a current sequencer connected in parallel;
the switching circuit comprises a flyback switching power supply, the flyback switching power supply comprises a high-frequency transformer, a power supply chip, a starting diode and a starting capacitor, the power supply chip is connected with a primary winding of the high-frequency transformer and used for controlling the high-frequency transformer to start or stop supplying power,
a VCC port on the output side of the power supply chip is connected with a starting capacitor, the anode of a starting diode is connected with a secondary winding of the high-frequency transformer, the cathode of the starting diode is connected between the VCC port of the power supply chip and the starting capacitor, and the secondary winding of the high-frequency transformer is connected with the VCC port of the power supply chip and the starting capacitor through the starting diode and is used for supplying power to the power supply chip and charging the starting capacitor;
the regulating circuit comprises a regulating diode and a regulating capacitor, the anode of the regulating diode is connected with the secondary winding of the high-frequency transformer, the cathode of the regulating diode is connected with the regulating capacitor, the secondary winding of the high-frequency transformer supplies power to the regulating capacitor through the regulating diode, the regulating capacitor supplies power to the load side when the flyback switching power supply is not started, and the power chip is connected with the regulating circuit and used for monitoring the current of the regulating circuit.
Further, the power chip's inside integrated MOS pipe, the FB port of power chip is used for detecting the output change of regulating circuit's voltage, and when power chip detects for light load work, the inside MOS pipe of power chip ends, and when power chip detects for heavy load work, the inside MOS pipe of power chip switches on.
Further, the starting diode is a Schottky diode, the starting capacitor is a patch capacitor, the capacity of the starting capacitor is 500 nF-1.2 uF, and the starting time of the flyback switching power supply is shorter than 15 ms.
Further, the limiting circuit further comprises a protection device for suppressing surge and protecting the circuit, wherein the protection device is a winding resistor, a PTC or a self-recovery protective tube connected between the switching circuit and the input power supply.
Furthermore, the input power supply is a three-phase power supply, the limiting circuit comprises three groups of limiting branches and a protection device, A, B, C phase lines of the three-phase power supply are respectively connected with the group of limiting branches, and the protection device is connected in an N-phase line of the three-phase power supply;
or, the input power is a three-phase power, the limiting circuit comprises a group of limiting branches and a protection device, the limiting branches are connected to an N-phase line of the three-phase power, and A, B, C-phase lines of the three-phase power are connected and then connected with the switch circuit through the protection device.
The circuit further comprises a rectifying circuit and a filtering circuit which are used for rectifying and filtering, wherein the rectifying circuit is connected with the limiting circuit, and the filtering circuit is connected between the rectifying circuit and the switching circuit.
Further, the rectification circuit is a half-wave rectification circuit, the input power supply is a three-phase power supply, the rectification circuit comprises three rectification diodes, and the three rectification diodes are correspondingly connected in series in A, B, C-phase circuits of the three-phase power supply respectively;
or, rectifier circuit is full-bridge rectifier circuit, and the input power is three phase current, rectifier circuit includes four first rectifier diodes and four second rectifier diodes, four first rectifier diodes's positive pole respectively with three phase current's A, B, C, N looks line connection, four first rectifier diodes's negative pole link together with filter circuit is connected, four second rectifier diodes's negative pole respectively with four first rectifier diodes's positive pole be connected, four second rectifier diodes's positive pole is earthed together.
Further, the filter circuit is a pi-type filter circuit, the filter circuit comprises a filter diode, an inductor, a first filter capacitor and a second filter capacitor, an anode of the filter diode is connected with the rectifying circuit, a cathode of the filter diode and one end of the first filter capacitor are connected with one end of the inductor, the other end of the inductor and an anode of the second filter capacitor are connected with a primary winding of the high-frequency transformer, and the other end of the first filter capacitor and a cathode of the second filter capacitor are connected with an output side of the power chip and are grounded.
Further, the switch circuit comprises an absorption circuit and a flyback switch power supply, wherein the absorption circuit comprises a first absorption diode, a second absorption diode and an absorption capacitor, the first absorption diode is connected with the absorption capacitor in parallel, and the cathode of the second absorption diode is connected with the cathode of the first absorption diode;
the DRAIN ports of the power chip are connected in parallel and then are respectively connected with the anode of the second absorption diode and one end of the primary winding of the high-frequency transformer, the other end of the primary winding of the high-frequency transformer is connected with the anode of the first absorption diode, one end of the secondary winding of the high-frequency transformer is connected with the anode of the starting diode, the cathode of the starting diode is connected into the VCC port of the power chip through a protection resistor, one end of the starting capacitor is connected with the VCC port of the power chip, the FB port of the power chip is connected with the regulating circuit, and the AGND and PGND ports on the output side of the power chip are connected with the other end of the starting capacitor and the other end of the secondary winding of the high-frequency transformer and are grounded together.
Further, the adjusting circuit comprises an adjusting diode, a first adjusting resistor, a second adjusting resistor, a first capacitor and a plurality of first adjusting capacitors connected in parallel, wherein the adjusting capacitors are formed by the first adjusting capacitors connected in parallel, the anode of the adjusting diode is connected with one end of a secondary winding of the high-frequency transformer, the cathode of the adjusting diode is connected with one end of the first adjusting resistor and one ends of the first adjusting capacitors connected in parallel, the other end of the first adjusting resistor, one end of the second adjusting resistor, the FB port of the power chip and one end of the first capacitor are connected, and the other end of the second adjusting resistor, the other end of the first capacitor and the other ends of the first adjusting capacitors connected in parallel are connected together and are grounded.
A circuit breaker comprising a fast start low power consumption power supply circuit as described above.
Preferably, the Bluetooth module and the MCU are further included, the Bluetooth module is connected with the MCU, and the quick-start low-power-consumption power circuit is connected with the Bluetooth module and the MCU and used for supplying power to the Bluetooth module and the MCU.
Preferably, the circuit breaker is electrically connected with the electric energy meter, and the circuit breaker is wirelessly connected with the electric energy meter through the Bluetooth module.
The utility model controls the power consumption of the fast start low-power-consumption power circuit in a normal working state and a standby sleeping state by arranging the limiting circuit suitable for a single-phase or three-phase power supply, the self-recovery switching tube and the sequence current device in the limiting circuit, the flyback switching power supply and the regulating circuit which are matched together, is favorable for reducing the power consumption of the fast start low-power-consumption power circuit in the standby sleeping state, the limiting circuit limits the current through the sequence current device when the input current is small, and breaks through the short-circuit sequence current device through the self-recovery switching tube when the input current is large; the flyback switching power supply is formed by the power supply chip and the high-frequency transformer, the flyback switching power supply is not started in a low-voltage working state and provides working voltage for a load side, the power supply chip can be quickly started by the high-frequency transformer in a short time in a normal-voltage working state, the starting time can be shorter than 15ms, and meanwhile, a secondary winding of the high-frequency transformer also provides the working voltage for the load side; and the regulating circuit is used for ensuring that the working voltage is provided for the load side when the flyback switching power supply is not started.
In addition, the starting time of the flyback switching power supply is matched with a starting capacitor by a Schottky diode connected on a power supply chip, wherein the capacity of the starting capacitor is 500 nF-1.2 uF, so that the starting time of the flyback switching power supply is less than 15 ms.
In addition, when the input power supply is a three-phase power supply, the limiting circuit can only set a limiting branch in the N-phase line, so that the cost for quickly starting the low-power-consumption power supply circuit is reduced.
In addition, the rectification and filtering of the voltage of the input power supply are carried out by arranging a rectification circuit and a filter circuit, wherein the rectification circuit adopts a half-wave rectification circuit or a full-bridge rectification circuit, the filter circuit adopts a pi-shaped filter circuit, and the half-wave rectification circuit and the pi-shaped filter circuit are matched to further reduce the power consumption of quickly starting the low-power-consumption power supply circuit, so that the standby power consumption of the Bluetooth module connected to the load side is less than 800uA under the wide voltage of AC 110-AC 300V, the quick starting of the power supply under the low voltage is met, and the starting time is 15 ms; the full-bridge rectification circuit and the pi-shaped filter circuit are matched to further improve the starting speed of the flyback switching power supply, so that the starting speed of the flyback switching power supply is 5ms, and the standby power consumption of a Bluetooth module connected to a load side is less than 800uA under the wide voltage of AC 110-AC 300V.
Drawings
FIG. 1 is a circuit diagram of a first embodiment of the present invention;
FIG. 2 is a circuit diagram of a second embodiment of the present invention;
fig. 3 is a circuit diagram of a third embodiment of the present invention.
Detailed Description
The following description will further describe a specific embodiment of the fast start low power consumption power circuit and the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 3. A quick start low power consumption power circuit and circuit breaker of the present invention is not limited to the description of the following embodiments.
The fast start low power consumption power circuit is described in detail with reference to fig. 1-3, and comprises an input power supply, a limiting circuit, a switching circuit and a regulating circuit which are connected in sequence, wherein the input power supply can be a three-phase power supply or a single-phase power supply, the limiting circuit comprises at least one group of limiting branches, the limiting branches are connected in a three-phase line of the three-phase power supply or only in an N line or in a line of the single-phase power supply to realize power consumption control of the fast start low power consumption power circuit, and each limiting branch comprises a self-recovery switching tube and a sequencer element which are connected in parallel;
the switching circuit comprises a flyback switching power supply, the flyback switching power supply comprises a high-frequency transformer and a power supply chip, and also comprises a starting diode and a starting capacitor, the power supply chip is connected with a primary winding of the high-frequency transformer and is used for controlling the high-frequency transformer to start and stop supplying power, a VCC port at the output side of the power supply chip is connected with the starting capacitor, the anode of the starting diode is connected with a secondary winding of the high-frequency transformer, the cathode of the starting diode is connected between the VCC port of the power supply chip and the starting capacitor, the secondary winding of the high-frequency transformer is connected with the VCC port of the power supply chip and the starting capacitor through the starting diode and is used for supplying power to the power supply chip and charging the starting capacitor, the starting capacitor is used for controlling the starting time of the flyback switching power supply and the stability of the VCC power supply of the power supply chip, when the high-frequency transformer stops supplying power, the starting capacitor supplies power to ensure the normal work of the power supply chip;
the regulating circuit comprises a regulating diode and a regulating capacitor, the anode of the regulating diode is connected with the secondary winding of the high-frequency transformer, the cathode of the regulating diode is connected with the regulating capacitor, the secondary winding of the high-frequency transformer supplies power to the regulating capacitor through the regulating diode, the regulating capacitor supplies power to the load side when the flyback switching power supply is not started, and the power chip is connected with the regulating circuit and used for monitoring the voltage of the regulating circuit so as to control the starting and the dormancy of the flyback switching power supply. Preferably, the adjusting capacitor is a large-capacity capacitor and is used for providing working voltage for load operation.
The utility model controls the power consumption of the fast start low-power-consumption power circuit in a normal working state and a standby sleeping state by arranging the limiting circuit suitable for a single-phase or three-phase power supply, the self-recovery switching tube and the sequence current device in the limiting circuit, the flyback switching power supply and the regulating circuit which are matched together, is favorable for reducing the power consumption of the fast start low-power-consumption power circuit in the standby sleeping state, the limiting circuit limits the current through the sequence current device when the input current is small, and breaks through the short-circuit sequence current device through the self-recovery switching tube when the input current is large; the flyback switching power supply is formed by the power supply chip and the high-frequency transformer, the flyback switching power supply is not started in a low-voltage working state and provides working voltage for a load side, the power supply chip can be quickly started by the high-frequency transformer in a short time in a normal-voltage working state, the starting time can be shorter than 15ms, and meanwhile, a secondary winding of the high-frequency transformer also provides the working voltage for the load side; and the regulating circuit is used for ensuring that the working voltage is provided for the load side when the flyback switching power supply is not started.
An MOS tube is integrated in the power chip, and ultra-low power consumption is realized through a flyback switching circuit; the selectable models of the power supply chip can be MP175GS, MP174GS or MP174 GJ. The method comprises the steps that an FB port of a power chip is used for detecting output change of voltage of a regulating circuit, when the power chip detects light-load work, an MOS tube in the power chip is cut off, specifically, the FB port on the output side of the power chip detects the light-load work, the voltage change frequency of the FB port is small at the moment, the current change flowing through the FB port is small, the MOS tube in the power chip is cut off, the PWM pulse output width is adjusted, the duty ratio in the power chip is also reduced, and therefore the flyback switching power supply enters a low-power-consumption standby state, is not started and supplies power to a load, and supplies power to the load through a regulating capacitor of the regulating circuit; when the power chip detects heavy-load work, the MOS tube inside the power chip is conducted, the voltage change frequency of the FB port detected by the power chip is high, and the current flowing through the FB port is large, so that the MOS tube inside the power chip is conducted, the PWM pulse output width of the power chip is narrow, the duty ratio is increased, the primary winding of the high-frequency transformer can generate electromotive force and induce the electromotive force to the secondary winding, the secondary winding of the high-frequency transformer simultaneously and respectively supplies power to the power chip and the load side of the adjusting capacitor, and the secondary winding of the high-frequency transformer is matched with the starting capacitor through the starting diode, so that the flyback switching power supply is quickly started, and a quick-starting low-power-consumption power circuit enters a normal working state.
The anodes of the starting diode and the regulating diode are respectively connected with the secondary winding of the high-frequency transformer, so that the secondary winding of the high-frequency transformer simultaneously supplies power to the power chip and the load side, the starting diode and the regulating diode are in the same level relation, the power chip is not supplied with power by the regulating capacitor of the regulating circuit, the power chip is directly supplied with power and started by the secondary winding of the high-frequency transformer, the rapid starting of the flyback switching power supply is realized, the rated voltage of heavy-load work is timely provided, and the normal work under the wide-voltage low-power consumption condition with three-phase power supply can be applied.
Preferably, the starting diode is an ultrafast recovery schottky diode. The capacity of the starting capacitor is related to the starting time of the flyback switching power supply, preferably, the starting capacitor is a patch capacitor, and the capacity of the starting capacitor is 500 nF-1.2 uF, so that the starting time of the flyback switching power supply in a wide voltage (AC 110V-AC 300V) range is less than 15ms, and quick starting is realized.
In addition, the design of the limiting circuit of the application is convenient for meeting the requirement that the current power consumption is increased due to load change, the power consumption loss is reduced through the matching of the self-recovery switching tube and the sequence current device, when the input current is relatively large, generally, the heavy load is heavy load and the flyback switching power supply is started, the power consumption of the current flowing through the sequence current device is larger than that in a standby sleep state, so that the voltage at two ends of the sequence current device and the voltage at two ends of the self-recovery switching tube are changed, when the voltage at two ends of the sequence current device is larger than the rated voltage of the self-recovery switching tube, the self-recovery switching tube forms high-voltage low-impedance, the self-recovery switching tube is caused to break down and conduct, the sequence current device is short-circuited, the current flows through the self-recovery switching tube and then is supplied to a rear-end power supply to work through the switching circuit, and larger working current is provided. When the input current is relatively small, the self-recovery switching tube is cut off, so that the current passes through the current sequencer and passes through the switching circuit to supply power to the load side, and the current is limited by the current limiting resistor, so that the loss is reduced.
The utility model provides an application embodiment does of quick start low-power consumption power supply circuit for an external circuit breaker of electric energy meter, the circuit breaker includes quick start low-power consumption power supply circuit, still include bluetooth module and main control unit MCU, bluetooth module is connected with main control unit MCU, quick start low-power consumption power supply circuit is connected with bluetooth module and main control unit MCU for bluetooth module and main control unit MCU power supply, the circuit breaker can regard as the bluetooth to break a little. The circuit breaker is electrically connected with the electric energy meter, the circuit breaker is wirelessly connected with the electric energy meter through the Bluetooth module, and the electric energy meter controls the circuit breaker through the Bluetooth module. This embodiment connects main control unit MCU and bluetooth module in the load side of quick start low power consumption power supply circuit, when bluetooth module does not have the communication change, main control unit MCU is in standby sleep mode, power chip detects to work for underloading this moment, the inside MOS pipe of power chip ends, flyback switching power supply does not start, the regulation electric capacity by regulating circuit provides load operating voltage, main control unit MCU obtains operating voltage, thereby reduce the consumption of quick start low power consumption power supply circuit, make the bluetooth module of connection in the load side also can normally receive bluetooth communication signal. When the Bluetooth module receives an external communication signal, the MCU is awakened to enter a working state, and signal processing such as switching on and switching off is performed.
According to the utility model, the limiting circuit suitable for a single-phase or three-phase power supply is arranged, the self-recovery switching tube and the sequencer in the limiting circuit, the flyback switching power supply and the regulating circuit are matched to control the power consumption of the quick-start low-power-consumption power supply circuit in a normal working state and a standby sleep state, so that the power consumption of the quick-start low-power-consumption power supply circuit in the standby sleep state is favorably reduced, the static power consumption of each phase standby machine of the quick-start low-power-consumption power supply circuit in a wide voltage (AC 110V-AC 300V) range is smaller than 800 muA, and a Bluetooth module connected to a load side can normally receive Bluetooth communication signals; in addition, the power chip and the high-frequency transformer form a flyback switching power supply, when the flyback switching power supply is in a normal working state, the flyback switching power supply is rapidly started by directly supplying power through the secondary winding of the high-frequency transformer, the starting time can be shorter than 15ms, meanwhile, the secondary winding of the high-frequency transformer also provides rated working voltage for the load side, when the flyback switching power supply is in a low-voltage working state, the flyback switching power supply is not started, and the load side obtains the working voltage smaller than the rated voltage.
Preferably, the switching circuit further comprises an absorption circuit, and two ends of the absorption circuit are respectively connected with two ends of a primary winding of the high-frequency transformer and are used for absorbing spike voltage of the flyback switching power supply.
Further, the limiting circuit still includes the protection device, the protection device is used for suppressing surge and protection circuit, the protection device is connected between switch circuit and input power with a set of or three group restriction branch circuit cooperations, when input power is three phase current, three phase current's A, B, C looks circuit is connected with a set of restriction branch circuit respectively, the protection device is connected in three phase current's N looks circuit, or, a set of restriction branch circuit is connected at three phase current's N looks circuit, A, B, C looks circuit of three phase current is connected the back and is connected with switch circuit through the protection device, wherein the optional winding resistance of protection device, PTC or self-resuming protective tube, the optional two-way TVS pipe of self-resuming switch tube in the restriction branch circuit, two-way ESD pipe, sequence current spare adopts resistance.
Preferably, still be connected with rectifier circuit and filter circuit that is used for rectification and filtering between input power and switch circuit, wherein rectifier circuit and limiting circuit are connected, and filter circuit connects between rectifier circuit and switch circuit, and wherein rectifier circuit can adopt half-wave rectifier circuit or full-bridge rectifier circuit, and pi type filter circuit is preferred to filter circuit, and when half-wave rectifier circuit and pi type filter circuit combination, can save the component, does benefit to reduce cost and consumption, when full-bridge rectifier circuit and pi type filter circuit combination, can further shorten flyback switching power supply's activation time.
A first embodiment of a rapid start low power consumption power supply circuit including a three-phase power supply as an input power supply, and a limiting circuit, a rectifying circuit, a filtering circuit, a switching circuit, and a regulating circuit connected in this order is provided with reference to fig. 1.
As shown in fig. 1, a variable resistor VR3, a variable resistor VR2 and a variable resistor VR1 are connected in parallel between the phase a line, the phase B line and the phase C line of the three-phase power supply and the phase N line, the limiting circuit includes three limiting branches and a protection device RF1, the three limiting branches are a first limiting branch formed by connecting a self-recovery switching tube D8 and a sequencer device R8 in parallel, a second limiting branch formed by connecting a self-recovery switching tube D34 and a sequencer device R59 in parallel, and a third limiting branch formed by connecting a self-recovery switching tube D35 and a sequencer device R60 in parallel, the first limiting branch, the second limiting branch and the third limiting branch are connected with the phase A, B, C line of the three-phase power supply, and the protection device RF1 is connected with the phase N line of the three-phase power supply.
In this embodiment, the half-wave rectification circuit is used as the rectification circuit, the pi-type filter circuit is used as the filter circuit, and rectification and filtering are performed by the half-wave rectification circuit and the pi-type filter circuit, so that elements in the low-power-consumption power circuit can be reduced, and cost and power consumption can be reduced.
Specifically, as shown in fig. 1, the rectifier circuit includes three rectifier diodes, which are a rectifier diode D30, a rectifier diode D31, and a rectifier diode D32, anodes of the three rectifier diodes are connected to a A, B, C-phase line of the three-phase power supply through a first limiting branch, a second limiting branch, and a third limiting branch, and cathodes of the three rectifier diodes are connected together and connected to the filter circuit; the filter circuit comprises a filter diode D1, an inductor L3, a first filter capacitor C35 and a second filter capacitor C8, wherein the anode of the filter diode D1 is connected with a rectifying circuit, specifically connected with the cathodes of three rectifying diodes, the cathode of the filter diode D1 and one end of a first filter capacitor C35 are connected with one end of the inductor L3, the other end of the inductor L3 and the anode of a second filter capacitor C8 are connected with a switch circuit, and the other end of the first filter capacitor C35 and the cathode of the second filter capacitor C8 are connected with one end of a protection device RF1 and then are connected with GND 1.
The switching circuit comprises a snubber circuit and a flyback switching power supply, wherein the snubber circuit comprises a first snubber diode D21, a second snubber diode D7 and a snubber capacitor C2, the first snubber diode D21 is connected with the snubber capacitor C2 in parallel, and the cathode of a second snubber diode D7 is connected with the cathode of a first snubber diode D21; the flyback switching power supply comprises a power chip U3, a high-frequency transformer T1, a starting capacitor C14, a starting diode D4 and a protective resistor R6, wherein all DRAIN ports on the input side of the power chip U3 are connected in parallel and then are respectively connected with the anode of a second absorption diode D7 and one end of the primary winding of the high-frequency transformer T1, the other end of the primary winding of the high-frequency transformer T1 is connected with the anode of a first absorption diode D21, one end of the secondary winding of the high-frequency transformer T1 is connected with the anode of a starting diode D4, the cathode of the starting diode D4 is connected to a VCC port on the output side of the power chip U3 through a protective resistor R6, one end of the starting capacitor C14 is connected with a VCC port on the output side of the power chip U3, a FB port on the output side of the power chip U3 is connected with a regulating circuit for regulating the voltage on the load side, AGND and PGND ports on the output side of the power chip U3 are connected with the other end of the starting capacitor C14, The other end of the secondary winding of the high-frequency transformer T1 is connected to GND 1. In this embodiment, the starting capacitor C14 is connected to the GND1 together with the N-phase lines of the three-phase power supply, and the capacitance of the starting capacitor C14 is 500nF to 1.2uF, so that the starting time of the flyback switching power supply is less than 15ms, the resistance of the protection resistor R6 is less than 100 Ω, and the protection resistor R6 may be omitted.
When the MOS transistor in the power chip U3 is turned off, the flyback switching power supply does not start, and the load side can obtain the operating voltage through the regulating capacitor of the regulating circuit, but the voltage value is gradually reduced from the rated voltage to the lowest voltage value of the VCC port on the output side of the power chip U3. When the capacitance voltage of the regulating capacitor on the load side is lower than the threshold voltage (the threshold voltage is usually 8V) of the VCC port on the output side of the power chip U3, the flyback switching power supply is started, the power chip U3 starts to work (the starting time is 5ms), the MOS tube in the power chip U3 is conducted, the starting capacitor C14 is rapidly charged, the charging is completed within 5ms, and after the charging is completed, the MOS tube is stopped to enter a standby mode.
As shown in fig. 1, a regulating circuit is connected to the switch circuit, the regulating circuit includes a regulating diode D2, a first regulating resistor R2, a second regulating resistor R10, a first capacitor C12, and one or more regulating capacitors connected in parallel, the regulating capacitor may be one or more, fig. 1 of this embodiment includes a regulating capacitor formed by a first regulating capacitor C6, a first regulating capacitor C07, and a first regulating capacitor C7 connected in parallel, and is used for supplying power to a load when the flyback switching power supply is not started, an anode of the regulating diode D2 is connected to one end of a secondary winding of the high-frequency transformer T1, that is, an anode of the regulating diode D2 and an anode of the starting diode D4 are connected to the same end of the secondary winding of the high-frequency transformer T1, a cathode of the regulating diode D2 is connected to one end of the first regulating resistor R2, and an anode of the first regulating capacitor C6, a cathode of the first regulating capacitor C6, and a second regulating capacitor C7 are connected to one end of the high-frequency transformer T4, An anode of the first adjustment capacitor C07 and one end of the first adjustment capacitor C7 are connected together and then connected to a cathode of the adjustment diode D2, the other end of the first adjustment resistor R2, one end of the second adjustment resistor R10, an FB port on the output side of the power chip U3, and one end of the first capacitor C12 are connected, the other end of the second adjustment resistor R10 and the other end of the first capacitor C12 are connected to the GND1, and the cathode of the first adjustment capacitor C6, the cathode of the first adjustment capacitor C07, and the other end of the first adjustment capacitor C7 are connected together and then connected to the GND 1. In this embodiment, the cathode of the regulating diode D2 and one end of the first regulating resistor R2 output 12V voltage to power the load.
In this embodiment, the start diode D4 in the switch circuit and the regulating diode D2 in the regulating circuit are in the same stage, and are both connected to the secondary winding of the high-frequency transformer T1, and there is no front-rear stage relationship, wherein the regulating diode D2 provides voltage for the load side, which is used for the energy storage of the capacitor in the regulating circuit and the operation of the load side, the start diode D4 supplies power to the VCC terminal of the output side of the power chip U3, when the VCC voltage of the power chip U3 is lower than the operating voltage, the power chip U3 will turn on the internal MOS transistor to operate, so that the secondary winding of the high-frequency transformer T1 simultaneously supplies power to the regulating diode D2 and the start diode D4, and the start diode D4 is matched with the start capacitor C14, so as to ensure the flyback switching power supply to start quickly, and the load side obtains the rated voltage by charging the regulating diode D2, compared with the existing connection mode using two stages of upper and lower diodes, the power supply chip U3 is powered by the regulating circuit, so that quick start can be realized.
In a second embodiment of the fast start low power consumption power supply circuit provided in conjunction with fig. 2, the fast start low power consumption power supply circuit includes a three-phase power supply as an input power supply, and a limiting circuit, a rectifying circuit, a filtering circuit, a switching circuit, and an adjusting circuit connected in sequence.
As shown in fig. 2, the limiting circuit includes a set of limiting branches and a protection device RF1, the limiting branches include a self-recovery switching tube D35 and a sequential current device R60 connected in parallel, the limiting branches are connected to N-phase lines of a three-phase power supply, and the protection device RF1 is connected between a filter circuit and a rectifying circuit, specifically, in this embodiment, the rectifying circuit includes three rectifying diodes, which are respectively a rectifying diode D30, a rectifying diode D31, and a rectifying diode D32, anodes of the three rectifying diodes are respectively connected to A, B, C-phase lines of the three-phase power supply, and cathodes of the three rectifying diodes are connected together and then connected to the filter circuit through the protection device RF 1.
The limiting circuit of the embodiment only adopts one group of limiting branches, so that current elements are saved, and the cost and the power consumption of the whole quick-start low-power-consumption power circuit are reduced.
A third embodiment of a fast start low power consumption power supply circuit is provided in conjunction with fig. 3, the fast start low power consumption power supply circuit includes a three-phase power supply as an input power supply, and a limiting circuit, a rectifying circuit, a filter circuit, a switch circuit, and an adjusting circuit that are connected in sequence, in this embodiment, the input power supply, the limiting circuit, the filter circuit, the switch circuit, and the adjusting circuit are the same as the first embodiment, wherein the rectifying circuit adopts a full-bridge rectifying circuit, and the full-bridge rectifying circuit cooperates with a pi-type filter circuit, which is beneficial to shortening the start time to 5 ms.
As shown in fig. 3, the rectifying circuit is connected between the limiting circuit and the filter circuit, the rectifying circuit is a full-bridge rectifying circuit and includes four first rectifying diodes and four second rectifying diodes, in fig. 3, the four first rectifying diodes are D5, D10, D13 and D16 respectively, the four second rectifying diodes are D14, D9, D12 and D15 respectively, anodes of the four first rectifying diodes are connected with A, B, C, N phase line of the three-phase power supply respectively, cathodes of the four first rectifying diodes are connected together and connected with the filter circuit, cathodes of the four second rectifying diodes are connected with anodes of the four first rectifying diodes and connected with the filter circuit respectively, and anodes of the four second rectifying diodes are connected with GND1 respectively, wherein the first rectifying diode and the second rectifying diode in the a-phase line, the B-phase line and the C-phase line are connected with the first rectifying diode in the N-phase line respectively, The second rectifying diode forms a bridge rectifying circuit, that is, the first rectifying diode D5, the second rectifying diode D14, the first rectifying diode D16 and the second rectifying diode D15 form a bridge rectifying circuit, the first rectifying diode D10, the second rectifying diode D9, the first rectifying diode D16 and the second rectifying diode D15 form a bridge rectifying circuit, and the first rectifying diode D13, the second rectifying diode D12, the first rectifying diode D16 and the second rectifying diode D15 form a bridge rectifying circuit, so that the start-up time of the flyback switching power supply is reduced by 10ms, and the start-up time in this embodiment is only 5 ms.
The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.
Claims (13)
1. The utility model provides a quick start low-power consumption power supply circuit, includes input power, limiting circuit, switch circuit and the regulating circuit who connects gradually, its characterized in that:
the limiting circuit comprises at least one group of limiting branches connected with an input power supply, and each limiting branch comprises a self-recovery switching tube and a current sequencer connected in parallel;
the switching circuit comprises a flyback switching power supply, the flyback switching power supply comprises a high-frequency transformer, a power supply chip, a starting diode and a starting capacitor, the power supply chip is connected with a primary winding of the high-frequency transformer and used for controlling the high-frequency transformer to start or stop supplying power,
a VCC port on the output side of the power supply chip is connected with a starting capacitor, the anode of a starting diode is connected with a secondary winding of the high-frequency transformer, the cathode of the starting diode is connected between the VCC port of the power supply chip and the starting capacitor, and the secondary winding of the high-frequency transformer is connected with the VCC port of the power supply chip and the starting capacitor through the starting diode and is used for supplying power to the power supply chip and charging the starting capacitor;
the regulating circuit comprises a regulating diode and a regulating capacitor, the anode of the regulating diode is connected with the secondary winding of the high-frequency transformer, the cathode of the regulating diode is connected with the regulating capacitor, the secondary winding of the high-frequency transformer supplies power to the regulating capacitor through the regulating diode, the regulating capacitor supplies power to the load side when the flyback switching power supply is not started, and the power chip is connected with the regulating circuit and used for monitoring the current of the regulating circuit.
2. A fast start low power consumption power supply circuit according to claim 1, characterized in that: the power supply chip is internally integrated with an MOS (metal oxide semiconductor) tube, an FB port of the power supply chip is used for detecting the output change of the voltage of the regulating circuit, when the power supply chip detects light-load work, the MOS tube in the power supply chip is cut off, and when the power supply chip detects heavy-load work, the MOS tube in the power supply chip is switched on.
3. A fast start low power consumption power supply circuit according to claim 1, characterized in that: the starting diode is a Schottky diode, the starting capacitor is a patch capacitor, the capacity of the starting capacitor is 500 nF-1.2 uF, and the starting time of the flyback switching power supply is shorter than 15 ms.
4. A fast start low power consumption power supply circuit according to claim 1, characterized in that: the limiting circuit further comprises a protection device for suppressing surge and protecting the circuit, wherein the protection device is a winding resistor, a PTC or a self-recovery protective tube connected between the switching circuit and the input power supply.
5. A fast start low power consumption power supply circuit according to claim 4, characterized in that: the input power supply is a three-phase power supply, the limiting circuit comprises three groups of limiting branches and a protection device, A, B, C phase lines of the three-phase power supply are respectively connected with the group of limiting branches, and the protection device is connected in N phase lines of the three-phase power supply;
or, the input power is a three-phase power, the limiting circuit comprises a group of limiting branches and a protection device, the limiting branches are connected to an N-phase line of the three-phase power, and A, B, C-phase lines of the three-phase power are connected and then connected with the switch circuit through the protection device.
6. A fast start low power consumption power supply circuit according to claim 1, characterized in that: the circuit also comprises a rectifying circuit and a filtering circuit which are used for rectifying and filtering, wherein the rectifying circuit is connected with the limiting circuit, and the filtering circuit is connected between the rectifying circuit and the switch circuit.
7. A fast start low power consumption power supply circuit according to claim 6, characterized in that: the rectifier circuit is a half-wave rectifier circuit, the input power supply is a three-phase power supply, and the rectifier circuit comprises three rectifier diodes which are respectively and correspondingly connected in series in an A, B, C-phase circuit of the three-phase power supply;
or, rectifier circuit is full-bridge rectifier circuit, and the input power is three phase current, rectifier circuit includes four first rectifier diodes and four second rectifier diodes, four first rectifier diodes's positive pole respectively with three phase current's A, B, C, N looks line connection, four first rectifier diodes's negative pole link together with filter circuit is connected, four second rectifier diodes's negative pole respectively with four first rectifier diodes's positive pole be connected, four second rectifier diodes's positive pole is earthed together.
8. A fast start low power consumption power supply circuit according to claim 6, characterized in that: the filter circuit is a pi-type filter circuit, the filter circuit comprises a filter diode, an inductor, a first filter capacitor and a second filter capacitor, the anode of the filter diode is connected with the rectifying circuit, the cathode of the filter diode and one end of the first filter capacitor are connected with one end of the inductor, the other end of the inductor and the anode of the second filter capacitor are connected with the primary winding of the high-frequency transformer, and the other end of the first filter capacitor and the cathode of the second filter capacitor are connected with the output side of the power chip and are grounded.
9. A fast start low power consumption power supply circuit according to claim 1, characterized in that: the switching circuit comprises an absorption circuit and a flyback switching power supply, wherein the absorption circuit comprises a first absorption diode, a second absorption diode and an absorption capacitor, the first absorption diode is connected with the absorption capacitor in parallel, and the cathode of the second absorption diode is connected with the cathode of the first absorption diode;
the DRAIN ports of the power chip are connected in parallel and then are respectively connected with the anode of the second absorption diode and one end of the primary winding of the high-frequency transformer, the other end of the primary winding of the high-frequency transformer is connected with the anode of the first absorption diode, one end of the secondary winding of the high-frequency transformer is connected with the anode of the starting diode, the cathode of the starting diode is connected into the VCC port of the power chip through a protection resistor, one end of the starting capacitor is connected with the VCC port of the power chip, the FB port of the power chip is connected with the regulating circuit, and the AGND and PGND ports on the output side of the power chip are connected with the other end of the starting capacitor and the other end of the secondary winding of the high-frequency transformer and are grounded together.
10. A fast start low power consumption power supply circuit according to claim 1, characterized in that: the adjusting circuit comprises an adjusting diode, a first adjusting resistor, a second adjusting resistor, a first capacitor and a plurality of first adjusting capacitors connected in parallel, wherein the adjusting capacitors are formed by the first adjusting capacitors connected in parallel, the anode of the adjusting diode is connected with one end of a secondary winding of the high-frequency transformer, the cathode of the adjusting diode is connected with one end of the first adjusting resistor and one ends of the first adjusting capacitors connected in parallel, the other end of the first adjusting resistor, one end of the second adjusting resistor, the FB port of the power chip and one end of the first capacitor are connected, and the other end of the second adjusting resistor, the other end of the first capacitor and the other ends of the first adjusting capacitors connected in parallel are connected together and are grounded.
11. A circuit breaker, characterized by: a fast start low power consumption power supply circuit comprising any one of claims 1 to 10.
12. A circuit breaker according to claim 11, wherein: the Bluetooth module is connected with the main control unit MCU, and the quick start low-power-consumption power circuit is connected with the Bluetooth module and the main control unit MCU and used for supplying power to the Bluetooth module and the main control unit MCU.
13. A circuit breaker according to claim 12, wherein: the circuit breaker is electrically connected with the electric energy meter, and the circuit breaker is wirelessly connected with the electric energy meter through the Bluetooth module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122495461.9U CN216290670U (en) | 2021-10-15 | 2021-10-15 | Quick start low-power consumption power supply circuit and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122495461.9U CN216290670U (en) | 2021-10-15 | 2021-10-15 | Quick start low-power consumption power supply circuit and circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216290670U true CN216290670U (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122495461.9U Active CN216290670U (en) | 2021-10-15 | 2021-10-15 | Quick start low-power consumption power supply circuit and circuit breaker |
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| Country | Link |
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| CN (1) | CN216290670U (en) |
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2021
- 2021-10-15 CN CN202122495461.9U patent/CN216290670U/en active Active
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