Power supply system with self-excitation drive function

Abstract

A power supply system with a self-excitation driving function includes a power supply device, a logic shutdown circuit, a self-supporting boost circuit, a protection circuit, and a current detection unit. The logic shutdown circuit is coupled between a positive power line and a negative power line. The self-supporting boost circuit converts the voltage between the positive power line and the negative power line into an auxiliary voltage, and the self-supporting boost circuit is coupled to the logic shutdown circuit. The protection circuit is coupled between the positive power line and the negative power line, and is coupled to the self-supporting boost circuit to receive the auxiliary voltage. The current detection unit outputs a current detection signal according to the current of the positive power line or the negative power line. The protection circuit short-circuits or opens the positive power line and the negative power line according to the current detection signal. The logic shutdown circuit disables or enables the self-supporting boost circuit according to the voltage between the positive power line and the negative power line.

Description

Technical Field

[0001] The present invention relates to a power supply system with a self-excitation driving function, and more particularly to a power supply system with a self-excitation driving function that enables and disables a self-excitation boost operation according to whether a load is unloaded. Background Art

[0002] The power supply device of the power supply system provides the power required by the load. If the load is far away from the power supply device, a circuit breaker is usually installed between the power supply device and the load to prevent the power supply device from continuously outputting power when the load is abnormal or the load is not ready to receive power, thereby endangering personnel safety and damaging equipment protection.

[0003] The common operation modes of existing circuit breakers are: 1. Both the load and the circuit breaker need to include an additional communication unit and communicate through signal line coupling, so that the load can control the circuit breaker to turn on or off the connection between the power supply device and the load; 2. The circuit breaker is a manual switch, and the operator needs to manually confirm the load status and then manually control the circuit breaker. Therefore, no matter which of the above methods is implemented, the circuit cost and labor cost of the power supply system need to be greatly increased.

[0004] Therefore, how to design a power supply system with a self-excitation driving function that enables or disables the self-excitation boost operation according to whether the load is unloaded is an important issue studied by the inventors of the present disclosure. Summary of the invention

[0005] The purpose of the present invention is to provide a power supply system with a self-excitation driving function to solve the problems of the prior art.

[0006] To achieve the above-mentioned purpose, the power supply system with self-excitation driving function proposed by the present invention is a power receiving device coupled by a positive power line and a negative power line. The power supply system includes a power supply device, a logic shutdown circuit, a self-supporting boost circuit, a protection circuit and a current detection unit. The power supply device outputs a DC power supply between the positive power line and the negative power line. The logic shutdown circuit is coupled between the positive power line and the negative power line. The self-supporting boost circuit is coupled between the positive power line and the negative power line, converts the voltage between the positive power line and the negative power line into an auxiliary voltage, and the receiving end of the self-supporting boost circuit is coupled to the output end of the logic shutdown circuit. The protection circuit is coupled between the positive power line and the negative power line, and the protection circuit is coupled to the self-supporting boost circuit to receive the auxiliary voltage. The current detection unit is coupled to the positive power line or the negative power line, and outputs a current detection signal according to the current of the positive power line or the negative power line. The protection circuit short-circuits or opens the positive power line and the negative power line according to the current detection signal, and the logic shutdown circuit disables or enables the self-supporting boost circuit according to the voltage between the positive power line and the negative power line.

[0007] In one embodiment, when the current detection signal is at a first level, the protection circuit short-circuits the positive power line and the negative power line; when the current detection signal is at a second level, the protection circuit opens the positive power line and the negative power line.

[0008] In one embodiment, the protection circuit includes a switch coupled between a positive power line and a negative power line; wherein, when the switch is turned on, the positive power line and the negative power line are short-circuited, and when the switch is turned off, the positive power line and the negative power line are open-circuited.

[0009] In one embodiment, the protection circuit includes a first switch coupled between a positive power line and a negative power line and a second switch coupled to the positive power line or the negative power line; wherein the first switch and the second switch are complementary controlled.

[0010] In one embodiment, the self-supporting boost circuit includes a transistor switch, a coupling coil and a capacitor. The coupling coil includes two magnetically coupled coils, wherein one end of the two magnetically coupled coils is coupled together, and the other end of the two magnetically coupled coils is coupled to the base and collector of the transistor switch respectively. The capacitor is coupled to the collector of the transistor switch to provide an auxiliary voltage.

[0011] In one embodiment, the self-supporting boost circuit further comprises a switch element. The control end of the switch element serves as the receiving end of the self-supporting boost circuit; and the logic shut-down circuit disables the self-supporting boost circuit by shutting down the switch element.

[0012] In one embodiment, the switch element is coupled between the positive power line and the coupling coil.

[0013] In one embodiment, the switch element is coupled between the negative power line and the coupling coil.

[0014] In one embodiment, the logic shutdown circuit disables the independent boost circuit when the voltage between the positive power line and the negative power line is greater than a threshold value.

[0015] In one embodiment, the self-supporting boost circuit further includes a diode coupled between the positive power line and the capacitor.

[0016] In one embodiment, the protection circuit further comprises a diode. The diode is coupled in series with the switch.

[0017] In one embodiment, the power supply device is a solar panel.

[0018] In one embodiment, the current detection unit is a Hall sensor and receives an auxiliary voltage.

[0019] Through the proposed power supply system with self-excitation driving function, when the power receiving device is not unloaded, the voltage output by the power supply device can be limited by short-circuiting the protection circuit to ensure the safety of the equipment and operators, and the small voltage can be boosted by the self-supporting boost circuit to be sufficient to supply the power required by the protection circuit and the current detection unit so that they can operate normally.

[0020] In order to further understand the technology, means and technical effects adopted by the present invention to achieve the predetermined purpose, please refer to the following detailed description and drawings of the present invention. It is believed that the purpose, characteristics and features of the present invention can be deeply and specifically understood thereby. However, the drawings are only provided for reference and explanation and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : is a block diagram of a power supply system with self-excitation driving function according to the present invention.

[0022] Figure 2 : is a circuit block diagram of the first embodiment of the power supply system with self-excitation driving function of the present invention.

[0023] Figure 3 : is a circuit block diagram of a second embodiment of a power supply system with self-excitation driving function of the present invention.

[0024] Figure 4 : is a circuit block diagram of the third embodiment of the power supply system with self-excitation driving function of the present invention.

[0025] Figure 5A to Figure 5C : They are circuit diagrams of different embodiments of the protection circuit of the present invention used in conjunction with the current detection unit.

[0026] Figure 6A to Figure 6C : They are block diagrams of different architectures of the power supply system with self-excitation driving function of the present invention.

[0027] Description of reference numerals:

[0028] 100: Power supply device

[0029] 200: Power receiving device

[0030] 10: Logic shutdown circuit

[0031] 20: Self-supporting boost circuit

[0032] 30: Protection circuit

[0033] 40: Current detection unit

[0034] Lp+: Positive power line

[0035] Lp-: Negative power line

[0036] Ps: Power supply path

[0037] L11: Coupling coil

[0038] RLY: Relay

[0039] Q1, Q12, Q13, Q14, Q15: Switch

[0040] Q21, Q22: switch

[0041] Q31, Q32, Q33: switch

[0042] S1, S2: switch

[0043] R12, R13, R14, R15: resistors

[0044] R21, R22, R23: resistors

[0045] R31, R32, R34, R35: resistors

[0046] R1, R2: resistor

[0047] RS: Sense resistor

[0048] C12, C13: capacitors

[0049] D11, D12, D13: diodes

[0050] D1: diode

[0051] D14: Zener diode

[0052] Va: auxiliary voltage

[0053] Vb, Vd, V2, V3: voltage

[0054] Vref: reference voltage

[0055] Is: current detection signal

[0056] Ia: current DETAILED DESCRIPTION

[0057] The technical content and detailed description of the present invention are described as follows with reference to the accompanying drawings.

[0058] See also Figure 1, which is a block diagram of a power supply system with a self-excitation driving function of the present invention. The power supply system with a self-excitation driving function (hereinafter referred to as the power supply system) comprises a power supply device 100, a logic shutdown circuit 10, a self-supporting boost circuit 20, a protection circuit 30, and a current detection unit 40, which are used to supply power to a power receiving device 200. In an embodiment of the present invention, the power supply device 100 is a device that provides a DC power output.

[0059] like Figure 1 As shown, the power receiving device 200 is coupled to the power supply device 100 via the positive power line Lp+ and the negative power line Lp-. The logic shutdown circuit 10 is coupled between the positive power line Lp+ and the negative power line Lp-. The independent boost circuit 20 is coupled between the positive power line Lp+ and the negative power line Lp-, and a receiving end of the independent boost circuit 20 is coupled to the output end of the logic shutdown circuit 10. The protection circuit 30 is coupled between the positive power line Lp+ and the negative power line Lp-, and the protection circuit 30 is coupled to the output end of the independent boost circuit 20. The current detection unit 40 is coupled to the positive power line Lp+ or the negative power line Lp- to detect the current size on the positive power line Lp+ or the negative power line Lp-. Figure 1 In the illustrated embodiment, the current detection unit 40 is coupled to the positive power line Lp+.

[0060] The power supply device 100 is a power supply device with DC output, and a solar panel is used as the power supply device 100 and a solar inverter is used as the power receiving device 200 for explanation. When the solar inverter used with the solar panel is not ready, or an emergency power outage is required (for example, maintenance, fire, or other abnormal conditions), in order to prevent the DC power continuously output from the solar panel from causing casualties, the positive power line Lp+ and the negative power line Lp- can be short-circuited by the protection circuit 30, so that the voltage provided to the solar inverter is reduced to a very small voltage value, such as about 1 volt. In this way, the probability and degree of equipment loss and casualties are minimized. The power supply device 100 can also be, for example, a power supply with a high-voltage DC output (for example, supplying power to a small base station at a long distance), and the power receiving device 200 can be a communication facility such as a small base station. When the power receiving device 200 is completely unloaded (for example, maintenance or other abnormal conditions), the protection circuit 30 can also be used to ensure that the voltage at the end of the power receiving device 200 reaches a safe voltage.

[0061] The following describes the operation of the power supply system of the present invention. Figure 2As shown in FIG. 1 , it is a circuit block diagram of the first embodiment of the power supply system with self-excitation driving function of the present invention. Assuming that the power supply device 100 has not yet output voltage and the power receiving device 200 is not ready, the current Ia flowing through the power supply path Ps is zero, the components of the entire power supply system have no power, and the current detection unit 40 will not detect the current.

[0062] When the power supply device 100 starts to output voltage, for the sake of convenience, a DC voltage of 10 volts is taken as an example. When the power receiving device 200 is not ready, since the power receiving device 200 has no unloading operation, the current Ia flowing through the power supply path Ps is still zero. At this time, the output voltage of the power supply device 100 provides the power required by the components of the power supply system. The current detection unit 40 outputs a first level current detection signal Is (e.g., a low level signal) according to the current Ia on the power supply path Ps, and the switch S1 of the protection circuit 30 is turned on according to the current detection signal Is. Therefore, the positive power line Lp+ and the negative power line Lp- are short-circuited, and only the voltage provided by the diode D11 and the switch S1 is about 1 volt. The number of diodes can be increased or decreased according to the voltage requirement.

[0063] Since this small voltage of 1 volt may not be able to maintain sufficient voltage for the protection circuit 30 (operational amplifier or other components) and the current detection unit 40 (such as a Hall sensor or other components), the components usually require a higher supply voltage. To solve this problem, it is necessary to select components with more special specifications, which makes component selection difficult and increases costs. Therefore, the present invention uses a self-supporting boost circuit 20 to boost this small voltage to a voltage of 5 to 10 volts, that is, to establish the auxiliary voltage Va of the capacitor C12 of the self-supporting boost circuit 20, so as to maintain a higher voltage supply to the protection circuit 30 and the current detection unit 40 for normal operation.

[0064] In this embodiment, the self-supporting boost circuit 20 is connected to the positive power line Lp+ through a normally closed relay RLY. A small voltage of 1 volt can be provided to the self-supporting boost circuit 20 for self-excited boosting, and the control end of the relay RLY serves as a receiving end of the self-supporting boost circuit 20, coupled to the output end of the logic shutdown circuit. The self-supporting boost circuit 20 includes a switch Q12 (a transistor switch) and a coupling coil L11. The coupling coil L11 includes two magnetically coupled coils. One end of the two magnetically coupled coils is commonly coupled to the positive power line Lp+, and the other end is respectively coupled to the base and collector of the switch Q12. This small voltage generates a current IB flowing to the base of the switch Q12 and a current IC flowing to the collector through the coupling coil L11, wherein IC=βIB. When the base current IB begins to increase, the collector current IC also increases accordingly, and thus, the coupling coil L11 begins to store energy. Once the collector current IC increases, causing the β value to decrease, so that IC<βIB, the switch Q12 enters the saturation region, and then enters the cut-off region, so that the switch Q12 is cut off. At this time, the energy stored in the coupling coil L11 charges the capacitor C12 through the path of the diode D12 and the capacitor C12, so that the auxiliary voltage Va increases, and its function is similar to a boost converter. In other words, the self-supporting boost circuit 20 converts the voltage between the positive power line Lp+ and the negative power line Lp- into the auxiliary voltage Va, providing the power requirements of the protection circuit 30 and the current detection unit 40.

[0065] When the energy on the coupling coil L11 is released, the base current IB flows again, so the collector current IC also increases. In this way, the energy storage and release of the coupling coil L11 are repeated, so that the energy storage and release of the excitation current are achieved through the switching action of the self-excited oscillation. In this way, the auxiliary voltage Va gradually increases, so that the small voltage of 1 volt can be boosted to a voltage of 5 to 10 volts, and the power supply to the protection circuit 30 and the current detection unit 40 can be maintained to enable normal operation. The above situation is that the power receiving device 200 is not (yet) unloaded, and there is a small voltage between the positive power line Lp+ and the negative power line Lp- that is like a short circuit.

[0066] When the power receiving device 200 starts to draw load, it means that the power receiving device 200 has started to operate, because there is a small voltage between the positive power line Lp+ and the negative power line Lp-. At this time, the current Ia flowing through the power supply path Ps is no longer zero, and the current detection unit 40 outputs a second level current detection signal Is (for example, a high level signal) according to the current Ia on the power supply path Ps. The switch S1 of the protection circuit 30 is turned off according to the current detection signal Is, so that the positive power line Lp+ and the negative power line Lp- are in an open circuit. Since the positive power line Lp+ and the negative power line Lp- are no longer short-circuited, the power required by the protection circuit 30 and the current detection unit 40 no longer needs to be provided by the independent boost circuit 20. Therefore, the independent boost circuit 20 is disabled by the logic shutdown circuit 10, and the power required by the protection circuit 30 and the current detection unit 40 is provided by the power supply device 100, for example, the 10 volts output by the power supply device 100 at this time.

[0067] Specifically, the 10V voltage output by the power supply device 100 is divided by resistors R12 and R13, and the divided voltage turns on the switch Q13. The 10V voltage is divided by resistors R14 and R15, and the divided voltage turns on the switch Q14. Therefore, a fixed voltage is provided at the Zener diode D14, and this voltage turns on the switch Q15, and a voltage is established at the capacitor C13. This capacitor voltage is coupled to the coil of the relay RLY. When the coil senses the voltage, the relay RLY is cut off (disconnected), thereby shutting off the path between the positive power line Lp+ and the self-supporting boost circuit 20, so that the coupling coil L11 has no path for storing and releasing energy, and the boosting action of the self-supporting boost circuit 20 is disabled (stopped). In other words, the self-supporting boost circuit 20 is coupled to the output end of the logic shutdown circuit 10 through a receiving end (relay RLY), and the logic shutdown circuit 10 can disable the self-supporting boost circuit 20 through the output end.

[0068] At this time, the 10V voltage output by the power supply device 100 also charges the capacitor C12 via the diode D13. In other words, the diode D13 provides a path for charging the capacitor C12 when the independent boost circuit 20 is disabled, so that the capacitor C12 can provide sufficient auxiliary voltage Va, so that the power required by the protection circuit 30 and the current detection unit 40 can be continuously supplied after the independent boost circuit 20 is disabled.

[0069] See also Figure 3 , which is a circuit block diagram of the second embodiment of the power supply system with self-excitation driving function of the present invention. Figure 2The main difference of the first embodiment shown is the difference of the logic shutdown circuit 10. The self-supporting boost circuit 20 is connected to the negative power line Lp- through the switch Q22, and the control end of the switch Q22 is used as a receiving end of the self-supporting boost circuit 20, coupled to the logic shutdown circuit 10. The details are as follows. As mentioned above, when the power receiving device 200 is not unloaded, the switch S1 of the protection circuit 30 is controlled to be turned on, so that the positive power line Lp+ and the negative power line Lp- are short-circuited. Therefore, the small voltage of 1 volt controls the switch Q22 to be turned on through the resistor R23 (however, the voltage after the voltage division by the resistors R21 and R22 is not enough to turn on the switch Q21), so that the self-supporting boost circuit 20 is enabled and self-excited. The principle of the boost operation is as mentioned above and will not be repeated here. Therefore, the small voltage of 1 volt is boosted to a voltage of 5 to 10 volts to maintain the power supply to the protection circuit 30 and the current detection unit 40, so that it can operate normally.

[0070] When the power receiving device 200 starts to draw load, the current Ia flowing through the power supply path Ps is no longer zero, and the switch S1 of the protection circuit 30 is turned off, so the positive power line Lp+ and the negative power line Lp- are open. The power required by the protection circuit 30 and the current detection unit 40 no longer needs to be provided by the independent boost circuit 20. Therefore, the independent boost circuit 20 is disabled through the logic shutdown circuit 10, and the power required by the protection circuit 30 and the current detection unit 40 is provided by the power supply device 100.

[0071] Specifically, the 10 volt voltage output by the power supply device 100 is divided by resistors R21 and R22, and the divided voltage turns on the switch Q21. Since the switch Q21 connects the gate and source of the switch Q22 (using MOS as an example), the zero volt voltage turns off the switch Q22. Thus, since the switch Q22 is turned off, the path between the self-supporting boost circuit 20 and the negative power line Lp- is cut off, so that the coupling coil L11 has no path for storing and releasing energy, and the boosting action of the self-supporting boost circuit 20 is disabled (stopped).

[0072] At this time, the 10V voltage output by the power supply device 100 also charges the capacitor C12 via the diode D13. In other words, the diode D13 provides a path for charging the capacitor C12 when the independent boost circuit 20 is disabled, so that the capacitor C12 can provide sufficient auxiliary voltage Va, so that the power required by the protection circuit 30 and the current detection unit 40 can be continuously supplied after the independent boost circuit 20 is disabled.

[0073] See also Figure 4 , which is a circuit block diagram of the third embodiment of the power supply system with self-excitation driving function of the present invention. Figure 2The main difference of the first embodiment shown is the difference in the logic shutdown circuit 10, which is described in detail as follows. As mentioned above, when the power receiving device 200 is not unloaded, the switch S1 of the protection circuit 30 is controlled to be turned on, so that the positive power line Lp+ and the negative power line Lp- are short-circuited. Therefore, the small voltage of 1 volt provides the voltage Vb through the resistors R35 and R36 to control the switch Q33 to be turned on, so that the self-supporting boost circuit 20 is enabled and self-excited. The principle of the boost operation is as described above and will not be repeated here. Therefore, the small voltage of 1 volt is boosted to a voltage of 5 to 10 volts to maintain the power supply to the protection circuit 30 and the current detection unit 40 so that they can operate normally.

[0074] When the power receiving device 200 starts to draw load, the current Ia flowing through the power supply path Ps is no longer zero, and the switch S1 of the protection circuit 30 is turned off, so the positive power line Lp+ and the negative power line Lp- are open. The power required by the protection circuit 30 and the current detection unit 40 no longer needs to be provided by the independent boost circuit 20. Therefore, the independent boost circuit 20 is disabled through the logic shutdown circuit 10, and the power required by the protection circuit 30 and the current detection unit 40 is provided by the power supply device 100.

[0075] Specifically, the 10V voltage output by the power supply device 100 is divided by resistors R31 and R32, and the divided voltage turns on the switch Q31 (taking n-MOS as an example). At the same time, the 10V voltage is divided by resistors R33 and R34, and the divided voltage turns on the switch Q32 (taking p-MOS as an example). At this time, the voltage Vb is equal to the 10V voltage of the positive power line Lp+, and this voltage controls the switch Q33 (taking p-MOS as an example) to turn off, thereby turning off the path between the self-supporting boost circuit 20 and the positive power line Lp+, so that the coupling coil L11 has no path for storing and releasing energy, and the boosting action of the self-supporting boost circuit 20 is disabled (stopped).

[0076] At this time, the 10V voltage output by the power supply device 100 also charges the capacitor C12 via the diode D13. In other words, the diode D13 provides a path for charging the capacitor C12 when the independent boost circuit 20 is disabled, so that the capacitor C12 can provide sufficient auxiliary voltage Va, so that the power required by the protection circuit 30 and the current detection unit 40 can be continuously supplied after the independent boost circuit 20 is disabled.

[0077] according to Figure 2 to Figure 4As described above, the logic shutdown circuit 10 determines whether to disable or enable the self-supporting boost circuit 20 according to the voltage between the positive power line Lp+ and the negative power line Lp-. Therefore, the condition for disabling the self-supporting boost circuit 20 can be determined by adjusting the parameters (such as the resistance value) in the logic shutdown circuit 10. For example, when the voltage between the positive power line Lp+ and the negative power line Lp- is greater than a threshold, the self-supporting boost circuit 20 is disabled, so as to ensure that all components of the power supply system can obtain sufficient voltage sources.

[0078] See also Figure 5A to Figure 5C As shown in FIG. 1 , it is a circuit diagram of different embodiments of the present invention in which the protection circuit and the current detection unit are used in conjunction with each other. Figure 2 to Figure 4 The protection circuit 30 (single switch S1 control) is used in conjunction with the embodiment, Figure 5A The embodiment shown uses two switches S1 and S2 as the protection circuit 30, and the current detection unit 40 uses a detection resistor RS with a differential amplifier. The two switches S1 and S2 are complementary controlled, that is, one is turned on and the other is turned off. When the power receiving device 200 is not unloaded (the current Ia is zero), the voltage difference Vab across the detection resistor RS is zero, so the voltage V2 of the current detection signal Is is low. Because the reference voltage Vref is greater than the voltage V2, the voltage V3 is high, so that the switch S1 is turned on and the switch S2 is turned off. On the contrary, when the power receiving device 200 starts to unload (the current Ia is not zero), the voltage difference Vab across the detection resistor RS is not zero, so the voltage V2 of the current detection signal Is is high. Because the reference voltage Vref is less than the voltage V2, the voltage V3 is low, so that the switch S1 is turned off and the switch S2 is turned on.

[0079] Compared to Figure 5A The detection resistor RS is used to detect the current Ia flowing through it. Figure 5B The current detection unit 40 is directly used by using a current transformer or a Hall sensor, and the voltage differential circuit structure is omitted. The advantage of using a current transformer is that no power supply is required. The current or voltage is sensed by the current flowing through, thereby outputting the current detection signal Is. When the power receiving device 200 is not unloaded (the current Ia is zero), the current detection unit 40 outputs a low potential voltage V2. Because the reference voltage Vref is greater than the voltage V2, the voltage V3 is a high potential, so that the switch S1 is turned on and the switch S2 is turned off. On the contrary, when the power receiving device 200 starts to unload (the current Ia is not zero), the current detection unit 40 outputs a high potential voltage V2. Because the reference voltage Vref is less than the voltage V2, the voltage V3 is a low potential, so that the switch S1 is turned off and the switch S2 is turned on.

[0080] Figure 5CThe embodiment shown uses two switches Q1 and S1 as the control of the protection circuit 30. When the power receiving device 200 is not unloaded (the current Ia is zero), the 10 volt voltage output by the power supply device 100 turns on the switch S1, and there is a small voltage between the positive power line Lp+ and the negative power line Lp-, which is like a short circuit. This small voltage supplies power to the current detection unit 40. If the current detection unit 40 needs a larger voltage, it can be powered by the independent boost circuit 20. When the power receiving device 200 starts to unload, the current detection signal Is output by the current detection unit 40 controls the switch Q1 to turn it on. Therefore, the voltage Vd coupled to the gate of the switch S1 is zero volts, and the switch S1 is turned off. Therefore, the positive power line Lp+ and the negative power line Lp- are like an open circuit. In this example, the resistance value of the designed resistor R1 is relatively large, so the current Ia will flow to the power receiving device 200. Furthermore, the diode D1 can use a Zener diode, a transient voltage suppressor (TVS), or a voltage regulator IC to control the driving voltage of the switch S1.

[0081] See also Figure 6A to Figure 6C As shown, they are block diagrams of different architectures of the power supply system with self-excitation driving function of the present invention. Fig. 6A As shown, a plurality of power supply devices 100 and corresponding logic shutdown circuits 10 , independent boost circuits 20 , protection circuits 30 and current detection units 40 are connected in series to form a single string, which is then connected to a power receiving device 200 . Figure 6B As shown, Fig. 6A The multiple strings are commonly connected to the power supply structure of the power receiving device 200. Figure 6C As shown, a plurality of (two are shown) power supply devices 100 can be connected to a set of logic shutdown circuits 10, independent boost circuits 20, protection circuits 30 and current detection units 40 respectively, and then connected in series to form a single string to form a power supply architecture of a power receiving device 200.

[0082] In summary, the present invention has the following features and advantages:

[0083] 1. The protection circuit 30 of the present invention does not need to use a communication unit, a communication line, or a communication protocol, which can effectively save circuit costs and simplify the design of the control circuit.

[0084] 2. When the power receiving device 200 is not unloaded, the output voltage of the power supply device 100 can be limited by the short circuit of the protection circuit 30 to ensure the safety of the equipment and the operator.

[0085] 3. When the power receiving device 200 is not unloaded, the small voltage is boosted by the independent boost circuit 20 to ensure the power required by the protection circuit 30 and the current detection unit 40 is supplied so that they can operate normally.

[0086] 4. When the power receiving device 200 is unloaded, the independent boost circuit 20 is disabled through the logic shutdown circuit 10, so that the power supply device 100 can directly provide the required power to the protection circuit 30 and the current detection unit 40.

[0087] The above description is only a detailed description and drawings of the preferred specific embodiments of the present invention, and the features of the present invention are not limited thereto and are not intended to limit the present invention. The full scope of the present invention shall be based on the claims. All embodiments that are consistent with the concepts of the claims of the present invention and similar variations thereof shall be included in the scope of the present invention. Any changes or modifications that can be easily conceived by any technical personnel in the field of the present invention may be covered by the claims of the present disclosure.

Claims

1. A power supply system with a self-excitation driving function, coupled to a power receiving device via a positive power line and a negative power line, comprising: A power supply device outputs a DC power supply between the positive power line and the negative power line; a logic shutdown circuit coupled between the positive power line and the negative power line; a self-supporting boost circuit, coupled between the positive power line and the negative power line, converting a voltage between the positive power line and the negative power line into an auxiliary voltage, and a receiving end of the self-supporting boost circuit is coupled to an output end of the logic shutdown circuit; a protection circuit coupled between the positive power line and the negative power line, and the protection circuit is coupled to the self-supporting boost circuit to receive the auxiliary voltage; and a current detection unit coupled to the positive power line or the negative power line and outputting a current detection signal according to a current of the positive power line or the negative power line; in, The protection circuit short-circuits or opens the positive power line and the negative power line according to the current detection signal, and the logic shutdown circuit disables or enables the self-supporting boost circuit according to the voltage between the positive power line and the negative power line.

2. The power supply system with self-excitation driving function as claimed in claim 1, wherein: When the current detection signal is at a first level, the protection circuit short-circuits the positive power line and the negative power line; when the current detection signal is at a second level, the protection circuit opens the positive power line and the negative power line.

3. The power supply system with self-excitation driving function as claimed in claim 1, wherein: The protection circuit includes a switch coupled between the positive power line and the negative power line; wherein, when the switch is turned on, the positive power line and the negative power line are short-circuited, and when the switch is turned off, the positive power line and the negative power line are open-circuited.

4. The power supply system with self-excitation driving function as claimed in claim 1, wherein: The protection circuit includes a first switch coupled between the positive power line and the negative power line and a second switch coupled to the positive power line or the negative power line; wherein the first switch and the second switch are controlled complementarily.

5. The power supply system with self-excitation driving function as claimed in claim 1, wherein: The self-supporting boost circuit includes: a transistor switch; a coupling coil, comprising two magnetically coupled coils, wherein one ends of the two magnetically coupled coils are coupled together, and the other ends of the two magnetically coupled coils are respectively coupled to the base and collector of the transistor switch; and A capacitor is coupled to the collector of the transistor switch to provide the auxiliary voltage.

6. The power supply system with self-excitation driving function as claimed in claim 5, wherein: The self-supporting boost circuit further comprises a switch element, a control end of which serves as the receiving end of the self-supporting boost circuit; the logic shut-off circuit disables the self-supporting boost circuit by shutting off the switch element.

7. The power supply system with self-excitation driving function as claimed in claim 6, wherein: The switch element is coupled between the positive power line and the coupling coil.

8. The power supply system with self-excitation driving function as claimed in claim 6, wherein: The switch element is coupled between the negative power line and the coupling coil.

9. The power supply system with self-excitation driving function as claimed in claim 1, wherein: The logic shutdown circuit disables the self-supporting boost circuit when the voltage between the positive power line and the negative power line is greater than a threshold.

10. The power supply system with self-excitation driving function as claimed in claim 5, wherein: The self-supporting boost circuit also includes: A diode is coupled between the positive power line and the capacitor.

11. The power supply system with self-excitation driving function as claimed in claim 3, wherein: The protection circuit also includes: A diode is coupled in series with the switch.

12. The power supply system with self-excitation driving function as claimed in claim 1, wherein: The power supply device is a solar panel.

13. The power supply system with self-excitation driving function as claimed in claim 1, wherein: The current detection unit is a Hall sensor and receives the auxiliary voltage.

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