A miniature simulated circuit breaker for a centralized controller

Abstract

The present invention discloses a miniature simulated circuit breaker for a centralized controller, comprising a power supply, a remote control opening and closing circuit, and a protective opening and closing circuit. The remote control opening and closing circuit and the protective opening and closing circuit have the same components and connection structure, both including an energy storage circuit, an opening circuit, and a closing circuit. The remote control opening and closing circuit and the protective opening and closing circuit are connected via a button K5. The present invention realizes the interlocking of opening and closing. After opening, the circuit can only be closed, and after closing, the circuit can only be opened. Energy must be stored before closing can be performed again, which is consistent with the working state of the circuit breaker. At the same time, by using a light-emitting diode in reverse parallel to the opening and closing relay coil, the reverse electromotive force after the relay action is completed is used to light up the light-emitting diode, which can not only indicate whether the opening and closing action is completed, but also prevent the reverse electromotive force from interfering with the circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic product testing equipment, and in particular to a miniature simulation circuit breaker for a centralized controller. Background Art

[0002] During the development of new distribution network terminal products, circuit breakers are often needed to verify their functions. During production testing, circuit breakers are also needed for factory testing. Especially during the peak shipping period, the demand for testing is even stronger, so there is a great demand for simulated circuit breakers.

[0003] Chinese patent CN215449471U discloses a simulated circuit breaker. This design uses two optocouplers to connect the opening and closing signals to a magnetic latching relay, and the two relays simulate the circuit breaker opening and closing process. When there is a closing signal, the relay is activated, the contacts are in the activating state, the HW contact is short-circuited with +24V, and a closing signal is generated; when there is an opening signal, the relay is reset, the contacts return to the reset state, the FW contact is short-circuited with +24V, and an opening signal is generated. However, in this circuit design, when the circuit is opened, the opening optocoupler is turned on, and when the circuit is closed, the closing optocoupler is turned on. In other words, after opening, the opening circuit can still work, and after closing, the closing operation can still be performed. There is no interlocking between opening and closing. Moreover, this simulated circuit breaker cannot simulate the opening and closing coils of an actual circuit breaker, so it cannot detect line breaks in the control circuit. It is still very different from an actual circuit breaker and cannot realize the function of a true simulated circuit breaker.

[0004] Chinese patent CN107102232A discloses a portable simulated circuit breaker, comprising a closing branch and an opening branch. The closing branch simulates the closing state of the circuit breaker, while the opening branch simulates the opening state of the circuit breaker. The closing and opening states are indicated by closing and opening indicators. However, this device does not meet the requirement that when the circuit breaker has stored energy, the opening and closing circuits are mutually exclusive. In other words, only one of the circuit breaker's opening and closing circuits must be in a state ready for remote control. Furthermore, the resistance of the opening and closing circuits is too high, which is equivalent to an open circuit to the controller's detection circuit, and the controller cannot detect that the control circuit is online. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned technology and propose a miniature simulated circuit breaker for a centralized controller. By using a relay coil with a rated voltage of 1.5V to simulate the opening and closing coils of the circuit breaker, it is more in line with the working state of the circuit breaker; and the interlocking of the opening and closing is designed to be consistent with the working state of the circuit breaker.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A miniature simulated circuit breaker for a centralized controller includes a power supply, a remote control opening and closing circuit, and a protective opening and closing circuit, wherein the components and connection methods of the remote control opening and closing circuit and the protective opening and closing circuit are the same, the remote control opening and closing circuit and the protective opening and closing circuit are connected in series through a button K5, and the opening, closing, and no-energy-storage signals of the remote control opening and closing circuit and the protective opening and closing circuit are synchronously shared; the remote control opening and closing circuit includes an energy storage circuit, an opening circuit, and a closing circuit; the opening circuit includes a first resistor R1, the first resistor R1 is connected in parallel with a sixth resistor R6 to form a first resistor group, one end of the first resistor group is connected to the positive pole of the second relay K2 coil, and the other end is connected to the opening remote control external interface FZ+, the negative pole of the second relay K2 coil is connected to pin 4 of the first relay K1; a first rectifier diode D1 and a second rectifier diode D2 The third rectifier diode D3, the fourth rectifier diode D4, and the thirty-eighth rectifier diode D38 are connected in series and then connected in parallel with the coil of the third relay K3. The reset coil of the first relay K1 is connected in series with the third contact K3C of the third relay K3, the actuating coil of the first relay K1 is connected in series with the second contact K2B of the second relay K2, the reset coil of the fourth relay K4 is connected in series with the second contact K3B of the third relay K3, and the fourth relay K4 is connected in series with a key K5.

[0008] Furthermore, the second contact switch K8B of the eighth relay K8 and the second contact switch K3B of the third relay K3 are connected in parallel.

[0009] Furthermore, the coil of the second relay K2 is connected in anti-parallel with a twenty-fourth light emitting diode D24; and the coil of the third relay K3 is connected in anti-parallel with a twenty-third light emitting diode D23.

[0010] Furthermore, the power supply adopts a 48V power supply, the rated voltage of the relay coil is 1.5V, and the resistance of the relay coil is 10Ω.

[0011] Furthermore, the reset coil of the first relay K1 is connected in parallel with the second electrolytic capacitor C2, the actuating coil of the first relay K1 is connected in parallel with the first electrolytic capacitor C1, and the reset coil of the fourth relay K4 is connected in parallel with the sixth electrolytic capacitor C6.

[0012] Furthermore, the second electrolytic capacitor C2, the first electrolytic capacitor C1 and the sixth electrolytic capacitor C6 are all 22 uF.

[0013] Furthermore, the reset coil of the first relay K1 is connected in parallel with a sixth freewheeling diode D6; the actuating coil of the first relay K1 is connected in parallel with a fifth freewheeling diode D5; the reset coil of the fourth relay K4 is connected in parallel with a thirteenth freewheeling diode D13; and the actuating coil of the fourth relay K4 is connected in parallel with a fourteenth freewheeling diode D14.

[0014] The beneficial effects of the present invention are:

[0015] 1. The interlocking of opening and closing is realized. After opening, the circuit breaker can only be closed, and after closing, the circuit breaker can only be opened. Energy must be stored before closing again, which is consistent with the working state of the circuit breaker.

[0016] 2. Use a relay coil with a rated voltage of 1.5V to simulate the opening and closing coil of the circuit breaker. The coil resistance is only 10Ω, and the circuit operating voltage is 48V, which is more in line with the working state of the circuit breaker.

[0017] 3. The present invention cleverly uses light-emitting diodes to be reversely connected in parallel with the opening and closing relay coils, and utilizes the reverse electromotive force after the relay action is completed to light up the light-emitting diodes, which can not only indicate whether the opening and closing actions are completed, but also prevent the reverse electromotive force from interfering with the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the circuit structure of a miniature simulated circuit breaker for a centralized controller in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following further describes the embodiments of the present invention in conjunction with the accompanying drawings and examples. It should be noted that the examples do not limit the scope of protection claimed in the present invention.

[0020] Example 1

[0021] As attached Figure 1 As shown, a miniature simulated circuit breaker for a centralized controller includes a power supply, a remote control opening and closing circuit, and a protective opening and closing circuit.

[0022] The remote control opening and closing circuit includes a first opening circuit, a first closing circuit and a first energy storage circuit; the protection opening and closing circuit includes a second opening circuit, a second closing circuit and a second energy storage circuit.

[0023] The first tripping circuit includes a first resistor R1, which is connected in parallel with a sixth resistor R6 as a first resistor group. One end of the first resistor group is connected to the positive pole of the second relay K2 coil, and the other end is connected to the external interface FZ+ of the tripping remote control. The negative pole of the second relay K2 coil is connected to pin 4 of the first relay K1; the first rectifier diode D1, the second rectifier diode D2 and the thirty-ninth rectifier diode D39 are connected in series and then connected in parallel with the second relay K2 coil, and the twenty-fourth light-emitting diode D24 is connected in anti-parallel to the second relay K2 coil.

[0024] Pin 3 of the first relay K1 is connected to the negative pole of the 48V power supply. Pins 3 and 4 of the first relay K1 are conductive when the first relay K1 is reset. Pin 8 of the first relay K1 is connected to the remote signal common terminal YXCOM, and pin 6 of the first relay K1 is connected to the remote signal interface FW.

[0025] The first closing circuit includes a second resistor R2, which is connected in parallel with a fifth resistor R5 to form a second resistor group. One end of the second resistor group is connected to pin 6 of the fourth relay K4, and the other end is connected to the positive electrode of the coil of the third relay K3. The negative electrode of the coil of the third relay K3 is connected to pin 5 of the first relay K1; the third rectifier diode D3, the fourth rectifier diode D4, and the thirty-eighth rectifier diode D38 are connected in series and then connected in parallel with the coil of the third relay K3. The twenty-third light-emitting diode D23 is connected in anti-parallel to the coil of the third relay K3.

[0026] Pins 3 and 5 of the first relay K1 are connected when the first relay K1 is in an operating state. Pin 7 of the first relay K1 is connected to the closed position remote signaling interface HW.

[0027] The reset coil of the first relay K1 is connected in series with the third contact K3C of the third relay K3, and the reset coil of the first relay K1 is controlled by the third contact K3C of the third relay K3; the actuating coil of the first relay K1 is connected in series with the second contact K2B of the second relay K2, and the actuating coil of the first relay K1 is controlled by the second contact K2B of the second relay K2; the reset coil of the fourth relay K4 is connected in series with the second contact K3B of the third relay K3, and the reset coil of the fourth relay K4 is controlled by the second contact K3B of the third relay K3.

[0028] When closing, that is, the external controller remotely closes the circuit breaker, the common terminal KCOM+ of the opening and closing circuit breaker and the remote control closing circuit breaker HZ+ are short-circuited at the controller, and the common terminal KCOM+ of the opening and closing circuit breaker is short-circuited with the positive terminal of the 48V power supply, so HZ+ is short-circuited with the positive terminal of the 48V power supply, and the third contact K3C of the third relay K3 is closed, and the first relay K1 is reset, generating a closing signal, and the first opening circuit is connected to the negative pole of the 48V power supply, and the first opening circuit is ready; the second contact K3B of the third relay K3 is closed, and the fourth relay K4 is reset, generating a no-energy-stored signal, and the first closing circuit is disconnected from the positive pole of the 48V power supply.

[0029] However, during this process, the first closing circuit is disconnected the moment the first relay K1 resets, leaving the third relay K3 incomplete. This causes the first relay K1 to fail to reset. Subsequently, the first closing circuit is reconnected, repeating the closing action. The first relay K1 resets multiple times during the closing pulse time. Therefore, a 22uF second electrolytic capacitor C2 is connected in parallel to the reset coil of the first relay K1 behind the third contact K3C of the third relay K3 to provide energy for the third relay K3 to operate. Similarly, a sixth electrolytic capacitor C6 is connected in parallel to the reset coil of the fourth relay K4 behind the second contact K3B of the third relay K3. When the second relay K2 is actuated, the second contact K2B of the second relay K2 is turned on, the first relay K1 is actuated, the first opening circuit is immediately disconnected, the actuation of the second relay K2 ends, and the second contact K2B is instantly disconnected. The first relay K1 will not be fully actuated for a short period of time and cannot maintain the actuated state. Therefore, the actuating coil of the first relay K1 is connected in parallel with the first electrolytic capacitor C1 on the rear side of the second contact K2B of the second relay K2.

[0030] The reset coil of the first relay K1 is connected in parallel with the sixth rectifier diode D6; the action coil of the first relay K1 is connected in parallel with the fifth rectifier diode D5, and the reset coil of the fourth relay K4 is connected in parallel with the thirteenth rectifier diode D13, providing a freewheeling circuit for the reverse electromotive force of the relay coil.

[0031] One end of the first electrolytic capacitor C1 is also connected to the open common terminal FWCOM, one end of the second electrolytic capacitor C2 is also connected to the closed common terminal HWCOM, and one end of the sixth electrolytic capacitor C6 is also connected to the un-energy-stored common terminal WCNCOM. (The correct explanation should be this) Pin 14 of the second relay K2 is connected in parallel with pin 14 of the seventh relay, pin 14 of the third relay K3 is connected in parallel with pin 14 of the eighth relay, and pin 24 of the third relay K3 is connected in parallel with pin 24 of the eighth relay.

[0032] The action coil of the fourth relay K4 is connected in parallel with the fourteenth freewheeling diode D14, the 8th pin of the fourth relay K4 is connected to the closing remote control external interface HZ+, the 4th pin of the fourth relay K4 is connected to the un-energy stored remote signal interface WCN, and the 3rd pin of the fourth relay K4 is connected to the remote signal common terminal YXCOM.

[0033] The second tripping circuit includes a third resistor R3, which is connected in parallel with the eighth resistor R8 to form a first resistor group. One end of the first resistor group is connected to the positive electrode of the coil of the seventh relay K7, and the other end is connected to the external interface FZ+ of the tripping remote control. The negative electrode of the coil of the seventh relay K7 is connected to pin 4 of the sixth relay K6; the fifteenth rectifier diode D15, the sixteenth rectifier diode D16 and the forty-first rectifier diode D41 are connected in series and then connected in parallel with the coil of the seventh relay K7. The PN junction voltage drop when the three rectifier diodes are turned on is used to provide a driving voltage for the third relay K3. The twenty-sixth light-emitting diode D26 is connected in anti-parallel to the coil of the seventh relay K7.

[0034] Pin 3 of the sixth relay K6 is connected to the negative pole of the 48V power supply. Pins 3 and 4 of the sixth relay K6 are conductive when the sixth relay K6 is in the reset state. Pin 8 of the sixth relay K6 is connected to the remote signal common terminal YXCOM. Pin 6 of the sixth relay K6 is connected to the position signal FW.

[0035] The first closing circuit includes a fourth resistor R4, which is connected in parallel with a seventh resistor R7 to form a second resistor group. One end of the second resistor group is connected to pin 6 of the tenth relay K10, and the other end is connected to the positive electrode of the coil of the eighth relay K8. The negative electrode of the coil of the eighth relay K8 is connected to pin 5 of the sixth relay K6; the seventeenth rectifier diode D17, the eighteenth rectifier diode D18, and the fortieth rectifier diode D40 are connected in series and then connected in parallel with the coil of the eighth relay K8. The twenty-fifth light-emitting diode D25 is connected in anti-parallel to the coil of the eighth relay K8.

[0036] Pins 3 and 5 of the sixth relay K6 are connected when the sixth relay K6 is in an operating state. Pin 7 of the sixth relay K6 is connected to the closing signal HW.

[0037] The reset coil of the sixth relay K6 is connected in series with the third contact K8C of the eighth relay K8, and the reset coil of the sixth relay K6 is controlled by the third contact K8C of the eighth relay K8; the actuating coil of the sixth relay K6 is connected in series with the second contact K7B of the seventh relay K7, and the actuating coil of the sixth relay K6 is controlled by the second contact K7B of the seventh relay K7; the reset coil of the tenth relay K10 is connected in series with the second contact K8B of the eighth relay K8, and the reset coil of the tenth relay K10 is controlled by the second contact K8B of the eighth relay K8.

[0038] The common terminal KCOM+ of the opening and closing circuit breaker is short-circuited with the positive pole of the 48V power supply. When the external controller remotely closes the circuit breaker, that is, the common terminal KCOM+ of the opening and closing circuit breaker is short-circuited with the remote closing circuit breaker HZ+ at the controller, the third contact K8C of the eighth relay K8 is closed, the sixth relay K6 is reset, and a closing signal is generated. The second opening circuit is connected to the negative pole of the 48V power supply, and the second opening circuit is ready; the second contact K8B of the eighth relay K8 is closed, the tenth relay K10 is reset, and a no-energy-stored signal is generated. The second closing circuit is disconnected from the positive pole of the 48V power supply.

[0039] However, during this process, the second closing circuit is disconnected the instant the sixth relay K6 resets, leaving the eighth relay K8 incomplete. This causes the sixth relay K6 to fail to reset, and the second closing circuit to open again, repeating the closing action. The first relay K1 will reset multiple times during the closing pulse time. Therefore, a 22uF third electrolytic capacitor C3 is connected in parallel to the reset coil of the sixth relay K6 behind the third contact K8C of the eighth relay K8 to provide energy for the eighth relay K8 to operate. Similarly, a fifth electrolytic capacitor C5 is connected in parallel to the reset coil of the tenth relay K10 behind the second contact K8B of the eighth relay K8. When the seventh relay K7 is actuated, the second contact K7B of the seventh relay K7 is turned on, the sixth relay K6 is actuated, the tripping circuit is immediately disconnected, the actuation of the seventh relay K7 is completed, the second contact K7B is instantly disconnected, and the sixth relay K6 will not be fully actuated for a short period of time and cannot maintain the actuated state. Therefore, the actuating coil of the sixth relay K6 is connected in parallel with the fourth electrolytic capacitor C4 on the rear side of the second contact K7B of the seventh relay K7.

[0040] The reset coil of the sixth relay K6 is connected in parallel with the twentieth rectifier diode D20; the action coil of the sixth relay K6 is connected in parallel with the nineteenth rectifier diode D19, and the reset coil of the tenth relay K10 is connected in parallel with the twenty-second rectifier diode D22, providing a freewheeling circuit for the reverse electromotive force of the relay coil.

[0041] One end of the fourth electrolytic capacitor C4 is also connected to the open common terminal FWCOM. One end of the third electrolytic capacitor C3 is also connected to the closed common terminal HWCOM. One end of the fifth electrolytic capacitor C5 is also connected to the un-energy-stored common terminal WCNCOM. Pin 14 of the seventh relay K7 is connected in parallel with pin 14 of the seventh relay. Pin 14 of the eighth relay K3 is connected in parallel with pin 14 of the eighth relay. Pin 24 of the eighth relay K3 is connected in parallel with pin 24 of the eighth relay.

[0042] The action coil of the tenth relay K10 is connected in parallel with the twenty-first freewheeling diode D21, the 8th pin of the tenth relay K10 is connected to the closing remote control external interface HZ+, the 4th pin of the tenth relay K10 is connected to the un-energy-stored remote signal interface WCN, and the 3rd pin of the tenth relay K10 is connected to the remote signal common terminal YXCOM.

[0043] The action coils of relays K4 and K10 are connected in series with the energy storage button K5.

[0044] Taking the remote control opening and closing circuit as an example, when the first relay K1 of the double-coil magnetic latching relay is in the reset state, the contacts 7 and 8 of the first relay are short-circuited, and the remote signal common terminal YXCOM is short-circuited with the closing remote signal HW. At this time, the simulated circuit breaker feeds back the closing signal to the outside. When the external controller gives the opening signal, that is, the opening FZ+ and the remote control common terminal KCOM are short-circuited at the controller, the first rectifier diode D1, the second rectifier diode D2 and the thirty-ninth rectifier diode D39 are turned on, and the PN junction voltage drop of the three diodes provides the operating voltage to the second relay K2, so that the coil K2A ​​of the second relay K2 is actuated, the second contact switch K2B is turned on, so that the first relay K1 is actuated, and the remote signal common terminal YXCOM is short-circuited with the closing remote signal HW. The simulated circuit breaker feeds back the opening signal to the outside. When the first K1 of the double-coil magnetic latching relay is in the action state, the simulated circuit breaker feeds back the opening signal to the outside, and the first The fourth relay K4 is in the reset state, and the circuit breaker's external feedback of no energy storage is cancelled, that is, the switch has stored energy and the closing circuit is connected. When the external controller gives a closing signal, the opening remote control external interface FZ+ and the remote control common terminal KCOM are short-circuited at the controller, and the closing remote control external interface HZ+ and the remote control common terminal KCOM are short-circuited. The third rectifier diode D3, the fourth rectifier diode D4 and the thirty-eighth rectifier diode D38 are turned on. Similarly, the third relay K3 is actuated, and the second contact switch K3B of the third relay K3 and the third contact switch K3C are turned on. The second contact switch K3B of the third relay K3 resets the fourth relay K4, simulating the circuit breaker to generate a switch no energy storage signal. The third contact switch K3C of the third relay K3 resets the first relay K1. The first relay K1 is in the reset state, the remote signal common terminal YXCOM and the closing remote signal HW are short-circuited, and the simulated circuit breaker generates a closing signal.

[0045] The twenty-third LED D23 and the twenty-fourth LED D24 are connected in reverse parallel to the first contact K2A of the coil of the second relay K2 and the first contact K3A of the third relay K3, respectively. When the second relay K2 and the third relay K3 complete their operation, their coils generate a reverse electromotive force. The reverse parallel connection of the LEDs discharges the reverse electromotive force of the relay coils and, incidentally, illuminates an LED to indicate the completion of the opening and closing operation. This ingenious use of LEDs connected in reverse parallel to the opening and closing relay coils utilizes the reverse electromotive force after the relays complete their operation to illuminate the LEDs. This not only indicates the completion of the opening and closing operation but also prevents the reverse electromotive force from interfering with the circuit.

[0046] The settings and workflow for the corresponding components in the protection opening and closing circuit are identical to those for the remote sensing opening and closing circuit. Furthermore, the open, closed, and no-energy-stored signals for both the remote control opening and closing circuit and the protection opening and closing circuit are synchronously shared. Simultaneously, the second contact switch K8B of the eighth relay K8 and the second contact switch K3B of the third relay K3 are connected in parallel, causing the reset coils of the fourth relay K4 and the tenth electrical device K10 to also be connected in parallel, allowing them to simultaneously generate the no-energy-stored signal. The operating states of the fourth relay K4 and the tenth electrical device K10 are controlled by the button K5, meaning their operating states are also controlled simultaneously.

[0047] The micro simulation circuit breaker for the centralized controller provided by the present invention realizes the interlocking of opening and closing, and can only be closed after opening, and can only be opened after closing.

[0048] Considering that the circuit breaker, in normal use, needs to execute the opening and closing instructions from the controller, and feedback the opening and closing execution status and the state of the circuit breaker itself, that is, the open position, the closed position, and the motor has not stored energy. Therefore, the simulated circuit breaker needs to have a no-energy-stored signal feedback; at the same time, the circuit breaker motor also needs motor energy storage to eliminate the no-energy-stored signal, because in fact, the closing function cannot be achieved in the circuit breaker's no-energy-stored state. The present invention uses the button K5 to replace the energy storage motor in the circuit breaker, simulates the energy storage process, and associates the no-energy-storage with the closing function. In the no-energy-storage state, the circuit breaker cannot be closed and must be closed after energy storage, which is more in line with the actual state of the circuit breaker.

[0049] Furthermore, the present invention uses a relay coil with a rated voltage of 1.5V to simulate the opening and closing coil of the circuit breaker. The coil resistance is only 10Ω, and the circuit operating voltage is 48V, which is more in line with the working state of the circuit breaker.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A miniature simulated circuit breaker for a centralized controller, characterized in that: The invention comprises a power supply, a remote control opening and closing circuit and a protective opening and closing circuit, wherein the components and connection methods of the remote control opening and closing circuit and the protective opening and closing circuit are the same, the remote control opening and closing circuit and the protective opening and closing circuit are connected in series via a key (K5), and the opening position, closing position and non-energy storage signals of the remote control opening and closing circuit and the protective opening and closing circuit are synchronously shared; the remote control opening and closing circuit comprises an opening circuit and a closing circuit; the opening circuit comprises a first resistor (R1), the first resistor (R1) is connected in parallel with a sixth resistor (R6) to form a first resistor group, one end of the first resistor group is connected to the positive pole of the coil of the second relay (K2), and the other end is connected to the opening remote control external interface (FZ+), and the negative pole of the coil of the second relay (K2) is connected to the 4th pin of the first relay (K1); a first rectifier diode (D1), a second rectifier diode (D2) and a thirty-ninth rectifier diode (D39) are connected in series and then connected in parallel with the coil of the second relay (K2); the first relay (K1) The 3rd pin of the first relay (K1) is connected to the negative pole of the power supply; the closing circuit includes a second resistor (R2); the second resistor (R2) and the fifth resistor (R5) are connected in parallel to form a second resistor group; one end of the second resistor group is connected to the 6th pin of the fourth relay (K4), and the other end is connected to the positive pole of the coil of the third relay (K3); the negative pole of the coil of the third relay (K3) is connected to the 5th pin of the first relay (K1); a third rectifier diode (D3), a fourth rectifier diode (D4) and a thirty-eighth rectifier diode (D38) are connected in series and then connected in parallel with the coil of the third relay (K3); the reset coil of the first relay (K1) is connected in series to the third contact (K3C) of the third relay (K3); the action coil of the first relay (K1) is connected in series to the second contact (K2B) of the second relay (K2); the reset coil of the fourth relay (K4) is connected in series to the second contact (K3B) of the third relay (K3); and the fourth relay (K4) is connected in series to a key (K5).

2. The miniature simulated circuit breaker for a centralized controller according to claim 1, characterized in that: The second contact switch (K8B) of the eighth relay (K8) and the second contact (K3B) of the third relay (K3) are connected in parallel.

3. The miniature simulated circuit breaker for a centralized controller according to claim 1, characterized in that: The coil of the second relay (K2) is connected in reverse parallel to a twenty-fourth light-emitting diode (D24); the coil of the third relay (K3) is connected in reverse parallel to a twenty-third light-emitting diode (D23).

4. The miniature simulated circuit breaker for a centralized controller according to claim 1, characterized in that: The power supply is 48V, the rated voltage of the relay coil is 1.5V, and the resistance of the relay coil is 10Ω.

5. The miniature simulated circuit breaker for a centralized controller according to claim 1, characterized in that: The reset coil of the first relay (K1) is connected in parallel with the second electrolytic capacitor (C2), the action coil of the first relay (K1) is connected in parallel with the first electrolytic capacitor (C1), and the reset coil of the fourth relay (K4) is connected in parallel with the sixth electrolytic capacitor (C6).

6. The miniature simulated circuit breaker for a centralized controller according to claim 5, characterized in that: The second electrolytic capacitor (C2), the first electrolytic capacitor (C1) and the sixth electrolytic capacitor (C6) are all 22uF.

7. The miniature simulated circuit breaker for a centralized controller according to claim 1, characterized in that: The reset coil of the first relay (K1) is connected in parallel with a sixth freewheeling diode (D6); the actuating coil of the first relay (K1) is connected in parallel with a fifth freewheeling diode (D5); the reset coil of the fourth relay (K4) is connected in parallel with a thirteenth freewheeling diode (D13); and the actuating coil of the fourth relay (K4) is connected in parallel with a fourteenth freewheeling diode (D14).

Images