Cost control circuit, circuit breaker and cost control system

Abstract

The utility model provides a kind of fee control circuit, circuit breaker and fee control system, it is related to electric power fee control technical field, the circuit includes: first detection module is electrically connected with fee control electric energy meter, power supply and central processing unit respectively;Second detection module is electrically connected with fee control electric energy meter, power supply and central processing unit respectively;Central processing unit is also electrically connected with circuit breaker;First detection module is used to when obtaining active fee control signal from fee control electric energy meter, first detection signal is sent to central processing unit;Second detection module is used to when obtaining passive fee control signal from fee control electric energy meter, second detection signal is sent to central processing unit;Central processing unit is used to according to first detection signal or second detection signal, control signal is sent to circuit breaker, to control circuit breaker opening or closing.The application has realized the flexible adaptation of fee control scene.

Description

Technical Field

[0001] This application relates to the field of power fee control technology, and more specifically, to a fee control circuit, a circuit breaker device, and a fee control system. Background Technology

[0002] Most prepaid reclosing circuit breakers on the market currently adopt a single active or passive control method, which limits users' choices in different application scenarios and fails to meet the differentiated needs of different customers. Therefore, proposing a prepaid control circuit that can adaptively select between active and passive control has become an urgent technical problem to be solved. Utility Model Content

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a prepaid circuit, a circuit breaker, and a prepaid system. This application provides the following technical solution: In a first aspect, this application provides a fee control circuit, including: a first detection module, a second detection module, and a central processing unit; The first detection module is electrically connected to the prepaid energy meter, the power supply, and the central processing unit, respectively. The second detection module is electrically connected to the prepaid energy meter, the power supply and the central processing unit respectively; The central processing unit is also electrically connected to the circuit breaker; The first detection module is used to send a first detection signal to the central processing unit when an active prepaid signal is obtained from the prepaid energy meter; The second detection module is used to send a second detection signal to the central processing unit when a passive prepaid signal is obtained from the prepaid energy meter; The central processing unit is used to send a control signal to the circuit breaker according to the first detection signal or the second detection signal, so as to control the circuit breaker to open or close.

[0004] In one embodiment, the active prepayment control signal includes: a prepayment signal or a prepayment arrears signal; the first detection signal includes: a first preset level signal or a second preset level signal; and the first detection module includes: a first optocoupler isolator and a first pull-up resistor. The first terminal of the first optocoupler is electrically connected to the prepaid energy meter, the second terminal of the first optocoupler is electrically connected to the negative terminal of the power supply, the third terminal of the first optocoupler is grounded, and the fourth terminal of the first optocoupler is electrically connected to the central processing unit and the first terminal of the pull-up resistor, respectively. The second end of the first pull-up resistor is electrically connected to the positive terminal of the power supply. The first optocoupler is used to enter a conducting state when the first terminal of the first optocoupler receives the paid signal, so that the fourth terminal of the first optocoupler is set to a first preset level, and the fourth terminal of the first optocoupler sends the first preset level signal to the central processing unit. When the first terminal of the first optocoupler receives the overdue payment signal, it enters the open state, so that the fourth terminal of the first optocoupler is set to the second preset level, and the fourth terminal of the first optocoupler sends the second preset level signal to the central processing unit.

[0005] In one embodiment, the passive fee control signal includes: the paid signal or the overdue signal; the second detection signal includes: the first preset level signal or the second preset level signal; and the second detection module includes: a second optocoupler isolator, a second pull-up resistor, and a third pull-up resistor. The first terminal of the second optocoupler is electrically connected to the first terminal of the second pull-up resistor, the second terminal of the second optocoupler is electrically connected to the prepaid energy meter, the second terminal of the second optocoupler is also grounded, the third terminal of the second optocoupler is grounded, and the fourth terminal of the second optocoupler is electrically connected to the first terminal of the third pull-up resistor and the central processing unit, respectively. The second end of the second pull-up resistor and the second end of the third pull-up resistor are also electrically connected to the positive terminal of the power supply. The second optocoupler is used to enter an open state when the second terminal of the second optocoupler receives the paid signal, so that the fourth terminal of the second optocoupler is set to a second preset level, and the fourth terminal of the second optocoupler sends the second preset level signal to the central processing unit. When the second terminal of the second optocoupler does not receive the overdue payment signal, it enters the conduction state, so that the fourth terminal of the second optocoupler is set to the first preset level, and the third terminal of the second optocoupler sends the first preset level signal to the central processing unit.

[0006] In one embodiment, the circuit further includes a feedback module, which is electrically connected to at least one phase output of the power supply, the central processing unit, and the circuit breaker. The feedback module is used to send a feedback signal to the central processing unit when an output voltage is detected from at least one phase output of the circuit breaker; The central processing unit is used to determine that the circuit breaker is in the closed state when the feedback signal is received.

[0007] In one embodiment, the feedback module includes: a third optocoupler isolator and a fourth pull-up resistor; The first terminal of the third optocoupler is electrically connected to at least one phase output of the circuit breaker, the second terminal of the third optocoupler is electrically connected to the negative terminal of the power supply, the third terminal of the third optocoupler is grounded, and the fourth terminal of the third optocoupler is electrically connected to the first terminal of the fourth pull-up resistor and the central processing unit, respectively. The second end of the fourth pull-up resistor is electrically connected to the positive terminal of the power supply. The third optocoupler is used to enter a conducting state when the first terminal of the third optocoupler detects the output voltage, so that the fourth terminal of the third optocoupler is placed at a first preset level, and the fourth terminal of the third optocoupler sends the feedback signal to the central processing unit.

[0008] In one embodiment, the first detection module further includes: a first diode and a first current-limiting resistor; The anode of the first diode is electrically connected to the central processing unit, and the cathode of the first diode is electrically connected to the first terminal of the first optocoupler isolator. The first end of the first current-limiting resistor is electrically connected to the first end of the first optocoupler isolator, and the second end of the first current-limiting resistor is electrically connected to the second end of the first optocoupler isolator.

[0009] In one embodiment, the second detection module further includes: a second diode and a second current-limiting resistor; The anode of the second diode is electrically connected to the second terminal of the second optocoupler isolator, the cathode of the second diode is electrically connected to the central processing unit, and the cathode of the second diode is also grounded. The first end of the second current-limiting resistor is electrically connected to the first end of the second optocoupler isolator, and the second end of the second current-limiting resistor is electrically connected to the second end of the second optocoupler isolator.

[0010] In one embodiment, the feedback module further includes: a third diode and a third current-limiting resistor; The anode of the third diode is electrically connected to the second terminal of the third optocoupler isolator, and the cathode of the third diode is electrically connected to the first terminal of the third optocoupler isolator. The first end of the third current-limiting resistor is electrically connected to the first end of the third optocoupler isolator, and the second end of the third current-limiting resistor is electrically connected to the second end of the third optocoupler isolator.

[0011] Secondly, this application provides a circuit breaker device, the device comprising: the fee control circuit and circuit breaker described in the first aspect.

[0012] Secondly, this application provides a prepaid electricity meter, the system comprising: a prepaid electricity meter, a power supply, and the circuit breaker device described in the second aspect.

[0013] This application adapts to different types of fee control signals through the first detection module and the second detection module, realizing flexible adaptation to fee control scenarios and solving the problem of limited selection of traditional single fee control methods.

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the cost control circuit provided in an embodiment of this application is shown; Figure 2 A circuit diagram of the first detection circuit provided in an embodiment of this application is shown; Figure 3 A circuit diagram of the second detection circuit provided in an embodiment of this application is shown; Figure 4 This paper shows another structural schematic diagram of the fee control circuit provided in an embodiment of the present application; Figure 5 A circuit diagram showing the connection between the feedback module and a single-phase circuit breaker provided in an embodiment of this application is shown. Figure 6 A circuit diagram showing the connection between the feedback circuit and a three-phase circuit breaker provided in an embodiment of this application is shown. Figure 7 A schematic diagram of the circuit breaker device provided in an embodiment of this application is shown; Figure 8 A schematic diagram of the cost control system provided in an embodiment of this application is shown.

[0017] Explanation of key component symbols: 100 - Fee control circuit; 110 - First detection module; 120 - Second detection module; 130 - Central processing unit; 140 - Feedback module; 200 - Fee control energy meter; 300 - Power supply; 400 - Circuit breaker; 700 - Circuit breaker device; 800 - Fee control system. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Example 1 Most existing circuit breakers on the market use a single active or passive control method to achieve opening or closing, which cannot meet the diverse needs of different customers. For more information, please refer to [link / reference needed]. Figure 1 This application provides a prepaid electricity control circuit 100, including: a first detection module 110, a second detection module 120, and a central processing unit 130; the first detection module 110 is electrically connected to a prepaid electricity meter 200, a power supply 300, and the central processing unit 130 respectively; the second detection module 120 is electrically connected to the prepaid electricity meter 200, the power supply 300, and the central processing unit 130 respectively; the central processing unit 130 is also electrically connected to a circuit breaker 400; The first detection module 110 is used to send a first detection signal to the central processing unit 130 when an active prepaid signal is obtained from the prepaid energy meter 200; the second detection module 120 is used to send a second detection signal to the central processing unit 130 when a passive prepaid signal is obtained from the prepaid energy meter 200; the central processing unit 130 is used to send a control signal to the circuit breaker 400 according to the first detection signal or the second detection signal, so as to control the circuit breaker 400 to open or close.

[0022] In this embodiment, the prepaid electricity meter 200 serves as a prepaid electricity control device, used to monitor the balance of the user account corresponding to the current electrical device. When the balance is insufficient, it issues an overdue payment signal; when it detects that the user has recharged and the balance has returned to normal, it issues a prepaid payment signal. Depending on the prepaid payment method, it outputs an active prepaid payment signal to the first detection module 110 or a passive prepaid payment signal to the second detection module 120. Both active and passive prepaid payment signals include either a prepaid payment signal or a non-prepaid payment signal.

[0023] The first detection module 110 is used to obtain an active prepaid energy control signal from the prepaid energy meter 200 and convert the active prepaid energy control signal into a level signal that can be recognized by the central processing unit 130, namely the first detection signal; the second detection module 120 obtains a passive prepaid energy control signal from the prepaid energy meter 200 and converts the passive prepaid energy control signal into a level signal that can be recognized by the central processing unit 130, namely the second detection signal; the central processing unit 130 sends a control signal to the circuit breaker 400 to control the opening or closing of the circuit breaker according to the received first detection signal or second detection signal, so as to trigger the circuit breaker 400 to open or close.

[0024] It is understandable that by using the independent first detection module 110 and the second detection module 120 to adapt to active and passive fee control signals respectively, the limitations of single signal detection are avoided, and the application scenarios of fee control are expanded.

[0025] In one embodiment, the active prepayment control signal includes either a prepayment signal or a prepayment arrears signal, and the first detection signal includes either a first preset level signal or a second preset level signal. (See also...) Figure 2 The first detection module 110 includes: a first optocoupler N1 and a first pull-up resistor R1; the first terminal of the first optocoupler N1 is electrically connected to the prepaid energy meter 200, the second terminal of the first optocoupler N1 is electrically connected to the negative terminal of the power supply 300, the third terminal of the first optocoupler N1 is grounded, and the fourth terminal of the first optocoupler N1 is electrically connected to the central processing unit 130 and the first terminal of the pull-up resistor R1 respectively; the second terminal of the first pull-up resistor R1 is electrically connected to the positive terminal of the power supply 300. The first optocoupler N1 is used to enter the conduction state when the first terminal of the first optocoupler N1 receives the paid signal, so that the fourth terminal of the first optocoupler N1 is set to a first preset level, and the fourth terminal of the first optocoupler N1 sends the first preset level signal to the central processing unit 130. When the first terminal of the first optocoupler N1 receives the overdue payment signal, it enters the open state, so that the fourth terminal of the first optocoupler N1 is set to the second preset level, and the fourth terminal of the first optocoupler N1 sends the second preset level signal to the central processing unit 130.

[0026] In this embodiment, please refer to Figure 2 , Figure 2 A circuit diagram of a first detection circuit provided in an embodiment of this application is shown. Figure 2 In this context, YYFK represents an active prepaid signal, which includes either a prepaid signal or a prepaid signal; YYFK_CTRL represents a first detection signal, which includes either a first preset level signal or a second preset level signal; and VDD represents the voltage obtained from the power supply 300.

[0027] The following is combined with Figure 2 Here's a simple explanation of the working principle of the first detection circuit: In this embodiment, the paid signal is a high-level signal, and the unpaid signal is a low-level signal. When the first terminal of the first optocoupler N1 receives a high-level signal, i.e., a paid signal, the light-emitting diode in the first optocoupler N1 emits a light signal, causing the secondary side of the first optocoupler N1 to receive the light signal and conduct. The fourth terminal of the first optocoupler N1 is then grounded, thereby pulling down the level of the fourth terminal of the first optocoupler N1, so that the central processing unit 130 obtains the first preset level signal.

[0028] When the first terminal of the first optocoupler N1 receives a low-level signal, i.e., an overdue payment signal, the light-emitting diode in the first optocoupler N1 does not emit light, and the secondary side of the first optocoupler N1 is not conducting. The fourth terminal of the first optocoupler N1 remains at a high level, causing the central processing unit 130 to receive a second preset level signal.

[0029] It is understandable that the first detection module 110 realizes the transmission of active fee control signals to the central processing unit 130 identifiable signals. Relying on the first optocoupler isolator N1 and the first pull-up resistor R1, it ensures the accuracy of signal detection and circuit safety, and provides technical support for the reliable opening and closing of the circuit breaker 400 in active fee control mode.

[0030] In one implementation, please refer again Figure 2 The first detection module 110 further includes: a first diode D1 and a first current-limiting resistor R2; the anode of the first diode D1 is electrically connected to the central processing unit 130, and the cathode of the first diode D1 is electrically connected to the first terminal of the first optocoupler N1; the first terminal of the first current-limiting resistor R2 is electrically connected to the first terminal of the first optocoupler N1, and the second terminal of the first current-limiting resistor R2 is electrically connected to the second terminal of the first optocoupler N1.

[0031] When a reverse current appears at the first terminal of the first optocoupler N1, the reverse cutoff characteristic of the first diode D1 can be used to prevent the prepaid energy meter 200 from being damaged by the reverse current surge.

[0032] In the first detection circuit, when the active prepaid energy meter 200 transmits a weak signal (or a weak signal caused by interference), this signal may not reach the threshold for the first optocoupler N1 to conduct normally. However, due to circuit characteristics, the first optocoupler N1 may be mis-activated, causing the central processing unit 130 to receive an incorrect level signal, affecting the accuracy of the circuit breaker 400's opening and closing control. The first current-limiting resistor R2, through its own resistance characteristics, limits the current flowing into the first optocoupler N1, preventing weak or interference signals from driving it to conduct. Only when a valid and sufficiently strong active prepaid energy signal is input will the first optocoupler N1 trigger normally, thus ensuring the accuracy of active prepaid energy signal detection, avoiding misoperation, and improving the circuit's anti-interference capability.

[0033] In addition, the first detection circuit also includes multiple current-limiting resistors R3, R4, R5, R6, and R7, and a first filter capacitor C1. The current-limiting resistors R3 and C1 are used to filter and debouncing the output first detection signal. The current-limiting resistors R4, R5, R6, and R7 function as voltage dividers and current limiters.

[0034] In one embodiment, the passive prepayment control signal includes either the paid signal or the overdue signal, and the second detection signal includes either the first preset level signal or the second preset level signal. (See also...) Figure 3 The second detection module 120 includes: a second optocoupler N2, a second pull-up resistor R8, and a third pull-up resistor R9; The first terminal of the second optocoupler N2 is electrically connected to the first terminal of the second pull-up resistor R8, the second terminal of the second optocoupler N2 is electrically connected to the prepaid energy meter 200, the second terminal of the second optocoupler N2 is also grounded, the third terminal of the second optocoupler N2 is grounded, and the fourth terminal of the second optocoupler N2 is electrically connected to the first terminal of the third pull-up resistor R9 and the central processing unit 130, respectively. The second end of the second pull-up resistor R8 and the second end of the third pull-up resistor R9 are also electrically connected to the positive terminal of the power supply 300, respectively. The second optocoupler N2 is used to enter an open state when the second terminal of the second optocoupler N2 receives the paid signal, so that the fourth terminal of the second optocoupler N2 is set to a second preset level, and the fourth terminal of the second optocoupler N2 sends the second preset level signal to the central processing unit 130. When the second terminal of the second optocoupler N2 does not receive the overdue payment signal, it enters the conduction state, so that the fourth terminal of the second optocoupler N2 is set to the first preset level, and the third terminal of the second optocoupler N2 sends the first preset level signal to the central processing unit 130.

[0035] In this embodiment, please refer to Figure 3 , Figure 3 A circuit diagram of the second detection circuit provided in an embodiment of this application is shown. Figure 3 In the above, WYFK_CTRL represents the second detection signal, which includes either a first preset level signal or a second preset level signal; VCC1 and VDD both represent the voltage obtained from the power supply 300. Figure 3 Passive prepayment control signals are not shown, but it should be noted that passive prepayment control signals include: prepayment signals or prepayment signals.

[0036] The following is combined with Figure 3 Here's a simple explanation of the working principle of the second detection circuit: In this embodiment, the paid signal is a high-level signal, and the unpaid signal is a low-level signal. When the second terminal of the second optocoupler N2 receives a high-level signal, i.e., a paid signal, the level of the second terminal of the second optocoupler N2 is pulled high. The light-emitting diode in the second optocoupler N2 is not conducting, and its secondary side is also not conducting. Consequently, the fourth terminal of the second optocoupler N2 remains at a high level, allowing the central processing unit 130 to obtain the second preset level signal.

[0037] When the second terminal of the second optocoupler N2 receives a low-level signal, i.e., an overdue payment signal, the level of the second terminal of the second optocoupler N2 is pulled low to ground. The light-emitting diode in the second optocoupler N2 emits a light signal, causing the secondary side of the second optocoupler N2 to receive the light signal and conduct. The fourth terminal of the second optocoupler N2 is grounded, thereby pulling down the level of the fourth terminal of the second optocoupler N2, so that the central processing unit 130 obtains the first preset level signal.

[0038] It is understandable that the second detection module 120 realizes the transmission of passive fee control signals to the central processing unit 130 identifiable signals, complementing the first detection module 110, and together realizes the active / passive dual-mode fee control of the circuit breaker 400. This solves the problem of limited user choice under the traditional single control method, and the stable signal detection and isolation design provides additional protection for power safety.

[0039] In one implementation, please refer again Figure 3 The second detection module 120 further includes: a second diode D2 and a second current-limiting resistor R10; the anode of the second diode D2 is electrically connected to the second terminal of the second optocoupler N2, the cathode of the second diode D2 is electrically connected to the central processing unit 130, and the cathode of the second diode D2 is also grounded; the first terminal of the second current-limiting resistor R10 is electrically connected to the first terminal of the second optocoupler N2, and the second terminal of the second current-limiting resistor R10 is electrically connected to the second terminal of the second optocoupler N2.

[0040] Similar to the first diode D1, when a reverse current appears at the second terminal of the second optocoupler N2, the reverse cut-off characteristic of the second diode D2 is used to prevent the prepaid energy meter 200 from being damaged by the reverse current surge.

[0041] The second detection circuit serves as a passive prepaid signal detection circuit. When the passive prepaid signal transmitted by the prepaid energy meter 200 is weak, it may cause the second optocoupler N2 to erroneously turn on. In this embodiment, a second current-limiting resistor R10 is connected in parallel with the first and second terminals of the second optocoupler N2. The resistance characteristics of the second current-limiting resistor R10 limit the current flowing into the second optocoupler N2 to avoid the second optocoupler N2 from erroneously turning on.

[0042] The second detection circuit also includes multiple current-limiting resistors R11 and R12, and a second filter capacitor. The current-limiting resistors R11 and the second filter capacitor C2 are used to filter and debouncing the output second detection signal. The current-limiting resistor R12 acts as a voltage divider and current limiter.

[0043] In one implementation, please refer to Figure 4 The prepaid circuit 100 further includes a feedback module 140, which is electrically connected to at least one phase output of the power supply 300, the central processing unit 130, and the circuit breaker 400. The feedback module 140 is used to send a feedback signal to the central processing unit 130 when an output voltage is detected from at least one phase output of the circuit breaker 400. The central processing unit 130 is used to determine that the circuit breaker 400 is in a closed state when it receives the feedback signal.

[0044] It should be noted that the control signals sent by the central processing unit 130 to the circuit breaker 400 include closing control signals or opening control signals. Specifically, when the central processing unit 130 obtains a first preset level signal from the first detection circuit or a second preset level signal from the second detection circuit, it sends a closing control signal to the circuit breaker 400 to control the circuit breaker 400 to close, allowing the electrical equipment to normally obtain power. When the central processing unit 130 obtains a second preset level signal from the first detection circuit or a first preset level signal from the second detection circuit, it sends an opening control signal to the circuit breaker 400 to control the circuit breaker 400 to open, cutting off power to the electrical equipment.

[0045] In this embodiment, to obtain the opening and closing status of the circuit breaker 400, a feedback module 140 is electrically connected to the output terminal of the circuit breaker 400. The circuit breaker 400 can be a single-phase circuit breaker 400 or a three-phase circuit breaker 400. When the circuit breaker 400 is in the closed state, at least one of its output terminals will have a normal supply voltage. After detecting this voltage signal, the feedback module 140 will convert it into a feedback signal (such as a specific level signal) that can be recognized by the central processing unit 130 and send it. When the circuit breaker 400 is open, there is no voltage at all output terminals, and the feedback module 140 will not send a feedback signal. The central processing unit 130 can determine the current closing status of the circuit breaker 400 by whether it receives a feedback signal.

[0046] It is understandable that the central processing unit 130 can verify whether the circuit breaker 400 has completed the closing action according to the instruction through feedback signals. If no feedback signal is received, the abnormality can be identified and handled in a timely manner, thereby improving the accuracy of fee control. Secondly, the feedback module 140 takes into account both single-phase and three-phase circuit breaker 400 application scenarios, adapting to different power consumption needs.

[0047] In one implementation, please refer to Figure 5 or Figure 6 The feedback module 140 includes: a third optocoupler N3 and a fourth pull-up resistor; the first terminal of the third optocoupler N3 is electrically connected to at least one phase output of the circuit breaker 400, the second terminal of the third optocoupler N3 is electrically connected to the negative terminal of the power supply 300, the third terminal of the third optocoupler N3 is grounded, and the fourth terminal of the third optocoupler N3 is electrically connected to the first terminal of the fourth pull-up resistor R13 and the central processing unit 130 respectively; the second terminal of the fourth pull-up resistor R13 is electrically connected to the positive terminal of the power supply 300; the third optocoupler N3 is used to enter a conducting state when the first terminal of the third optocoupler N3 detects the output voltage, so that the fourth terminal of the third optocoupler N3 is placed at a first preset level, and the fourth terminal of the third optocoupler N3 sends the feedback signal to the central processing unit 130.

[0048] Figure 5 and Figure 6 A circuit diagram of the feedback module 140 is shown below. Figure 5 The feedback module 140 is electrically connected to the output terminal of the single-phase circuit breaker 400. Figure 6 The feedback module 140 and the three-phase outputs of the three-phase circuit breaker 400 are electrically connected respectively. Figure 5 and Figure 6 STA represents the feedback signal output by the feedback module 140. When the first terminal of the third optocoupler N3 detects the output voltage of the circuit breaker 400, the light-emitting diode in the third optocoupler N3 is turned on, which turns on the secondary side of the third optocoupler N3. The third terminal of the third optocoupler N3 is grounded, which sets the output feedback signal to a low level. At this time, the central processing unit 130 determines that the circuit breaker 400 is in the closed state.

[0049] Conversely, when the first terminal of the third optocoupler N3 detects the output voltage of the circuit breaker 400, the light-emitting diode in the third optocoupler N3 is not turned on, the secondary side of the third optocoupler N3 is not turned on, and the third terminal of the third optocoupler N3 remains at a high level, so that the output feedback signal is set to a high level. At this time, the central processing unit 130 determines that the circuit breaker 400 is in the open state.

[0050] It is understandable that when the circuit breaker 400 is a three-phase circuit breaker 400, the feedback module 140 can realize independent opening and closing status detection.

[0051] In one implementation, please refer again Figure 5 or Figure 6 The feedback module 140 further includes: a third diode D3 and a third current-limiting resistor R15; the anode of the third diode D3 is electrically connected to the second terminal of the third optocoupler N3, and the cathode of the third diode D3 is electrically connected to the first terminal of the third optocoupler N3; the first terminal of the third current-limiting resistor R15 is electrically connected to the first terminal of the third optocoupler N3, and the second terminal of the third current-limiting resistor R15 is electrically connected to the second terminal of the third optocoupler N3.

[0052] In this embodiment, the third diode D3 is used to limit reverse current surges, and the third current-limiting resistor R15 is used to prevent small signals from interfering with the conduction of the third optocoupler N3. The feedback module 140 also includes current-limiting resistors R16 and R14 and a third filter capacitor C3, wherein the current-limiting resistors R14 and the third filter capacitor C3 are used to filter and debouncing the output feedback signal, and the current-limiting resistor R16 acts as a voltage divider and current limiter.

[0053] The prepaid circuit 100 provided in this application embodiment includes: a first detection module 110, a second detection module 120, and a central processing unit 130; the first detection module 110 is electrically connected to a prepaid energy meter 200, a power supply 300, and the central processing unit 130 respectively; the second detection module 120 is electrically connected to the prepaid energy meter 200, the power supply 300, and the central processing unit 130 respectively; the central processing unit 130 is also electrically connected to a circuit breaker 400; the first detection module 110 is used to send a first detection signal to the central processing unit 130 when an active prepaid signal is obtained from the prepaid energy meter 200; the second detection module 120 is used to send a second detection signal to the central processing unit 130 when a passive prepaid signal is obtained from the prepaid energy meter 200; the central processing unit 130 is used to send a control signal to the circuit breaker 400 according to the first detection signal or the second detection signal to control the circuit breaker 400 to open or close. This application adapts different types of fee control signals through the first detection module 110 and the second detection module 120, realizing flexible adaptation to fee control scenarios and solving the problem of limited selection of traditional single fee control methods.

[0054] Example 2 In addition, please see Figure 7 This application also provides a circuit breaker device 700, including: the prepaid circuit 100 and the circuit breaker 400 described in embodiment 1, wherein the circuit breaker 400 is electrically connected to the prepaid circuit 100.

[0055] The circuit breaker 700 provided in this embodiment can achieve the function of the circuit breaker 400 provided in Embodiment 1 above. To avoid repetition, it will not be described again here.

[0056] The circuit breaker 700 provided in this application embodiment adapts to different types of fee control signals through the first detection module 110 and the second detection module 120, realizing flexible adaptation to fee control scenarios and solving the problem of limited selection of traditional single fee control methods.

[0057] Example 3 In addition, please see Figure 8 This utility model provides a prepaid electricity control system 800, including: a prepaid electricity meter 200, a power supply 300, and a circuit breaker 700 as described in Embodiment 2. The prepaid electricity meter 200 and the power supply 300 are electrically connected to the circuit breaker 700.

[0058] The cost control system 800 provided in this embodiment can realize the function of the circuit breaker 700 provided in Embodiment 2 above. To avoid repetition, it will not be described again here.

[0059] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0060] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0061] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A prepaid expense control circuit, characterized in that, include: The system comprises a first detection module, a second detection module, and a central processing unit. The first detection module is electrically connected to the prepaid energy meter, the power supply, and the central processing unit, respectively. The second detection module is electrically connected to the prepaid energy meter, the power supply and the central processing unit respectively; The central processing unit is also electrically connected to the circuit breaker; The first detection module is used to send a first detection signal to the central processing unit when an active prepaid signal is obtained from the prepaid energy meter; The second detection module is used to send a second detection signal to the central processing unit when a passive prepaid signal is obtained from the prepaid energy meter; The central processing unit is used to send a control signal to the circuit breaker according to the first detection signal or the second detection signal, so as to control the circuit breaker to open or close.

2. The expense control circuit according to claim 1, characterized in that, The active prepayment control signal includes: a prepayment signal or a prepayment signal; the first detection signal includes: a first preset level signal or a second preset level signal; the first detection module includes: a first optocoupler isolator and a first pull-up resistor. The first terminal of the first optocoupler is electrically connected to the prepaid energy meter, the second terminal of the first optocoupler is electrically connected to the negative terminal of the power supply, the third terminal of the first optocoupler is grounded, and the fourth terminal of the first optocoupler is electrically connected to the central processing unit and the first terminal of the pull-up resistor, respectively. The second end of the first pull-up resistor is electrically connected to the positive terminal of the power supply. The first optocoupler is used to enter a conducting state when the first terminal of the first optocoupler receives the paid signal, so that the fourth terminal of the first optocoupler is set to a first preset level, and the fourth terminal of the first optocoupler sends the first preset level signal to the central processing unit. When the first terminal of the first optocoupler receives the overdue payment signal, it enters the open state, so that the fourth terminal of the first optocoupler is set to the second preset level, and the fourth terminal of the first optocoupler sends the second preset level signal to the central processing unit.

3. The expense control circuit according to claim 2, characterized in that, The passive fee control signal includes: the paid signal or the overdue signal; the second detection signal includes: the first preset level signal or the second preset level signal; the second detection module includes: a second optocoupler isolator, a second pull-up resistor and a third pull-up resistor. The first terminal of the second optocoupler is electrically connected to the first terminal of the second pull-up resistor, the second terminal of the second optocoupler is electrically connected to the prepaid energy meter, the second terminal of the second optocoupler is also grounded, the third terminal of the second optocoupler is grounded, and the fourth terminal of the second optocoupler is electrically connected to the first terminal of the third pull-up resistor and the central processing unit, respectively. The second end of the second pull-up resistor and the second end of the third pull-up resistor are also electrically connected to the positive terminal of the power supply. The second optocoupler is used to enter an open state when the second terminal of the second optocoupler receives the paid signal, so that the fourth terminal of the second optocoupler is set to a second preset level, and the fourth terminal of the second optocoupler sends the second preset level signal to the central processing unit. When the second terminal of the second optocoupler does not receive the overdue payment signal, it enters the conduction state, so that the fourth terminal of the second optocoupler is set to the first preset level, and the third terminal of the second optocoupler sends the first preset level signal to the central processing unit.

4. The expense control circuit according to claim 1, characterized in that, The circuit further includes a feedback module, which is electrically connected to at least one phase output of the power supply, the central processing unit and the circuit breaker respectively. The feedback module is used to send a feedback signal to the central processing unit when an output voltage is detected from at least one phase output of the circuit breaker; The central processing unit is used to determine that the circuit breaker is in the closed state when the feedback signal is received.

5. The fee control circuit according to claim 4, characterized in that, The feedback module includes: a third optocoupler isolator and a fourth pull-up resistor; The first terminal of the third optocoupler is electrically connected to at least one phase output of the circuit breaker, the second terminal of the third optocoupler is electrically connected to the negative terminal of the power supply, the third terminal of the third optocoupler is grounded, and the fourth terminal of the third optocoupler is electrically connected to the first terminal of the fourth pull-up resistor and the central processing unit, respectively. The second end of the fourth pull-up resistor is electrically connected to the positive terminal of the power supply. The third optocoupler is used to enter a conducting state when the first terminal of the third optocoupler detects the output voltage, so that the fourth terminal of the third optocoupler is placed at a first preset level, and the fourth terminal of the third optocoupler sends the feedback signal to the central processing unit.

6. The expense control circuit according to claim 2, characterized in that, The first detection module further includes: a first diode and a first current-limiting resistor; The anode of the first diode is electrically connected to the central processing unit, and the cathode of the first diode is electrically connected to the first terminal of the first optocoupler isolator. The first end of the first current-limiting resistor is electrically connected to the first end of the first optocoupler isolator, and the second end of the first current-limiting resistor is electrically connected to the second end of the first optocoupler isolator.

7. The expense control circuit according to claim 3, characterized in that, The second detection module further includes: a second diode and a second current-limiting resistor; The anode of the second diode is electrically connected to the second terminal of the second optocoupler isolator, the cathode of the second diode is electrically connected to the central processing unit, and the cathode of the second diode is also grounded. The first end of the second current-limiting resistor is electrically connected to the first end of the second optocoupler isolator, and the second end of the second current-limiting resistor is electrically connected to the second end of the second optocoupler isolator.

8. The fee control circuit according to claim 5, characterized in that, The feedback module further includes: a third diode and a third current-limiting resistor; The anode of the third diode is electrically connected to the second terminal of the third optocoupler isolator, and the cathode of the third diode is electrically connected to the first terminal of the third optocoupler isolator. The first end of the third current-limiting resistor is electrically connected to the first end of the third optocoupler isolator, and the second end of the third current-limiting resistor is electrically connected to the second end of the third optocoupler isolator.

9. A circuit breaker device, characterized in that, The device includes: the fee control circuit and circuit breaker as described in any one of claims 1-8.

10. A cost control system, characterized in that, The system includes: a prepaid electricity meter, a power supply, and the circuit breaker device as described in claim 9.

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