TWI519022B - Non-battery alternator system, voltage regulator and overload protection circuit thereof - Google Patents

Description

Batteryless generator system, voltage regulator and overload protection circuit

The invention relates to an overload protection circuit, and in particular to a voltage regulator suitable for a batteryless generator system and an overload protection circuit thereof.

In general, current mass transit vehicles (such as buses or bus buses) are usually equipped with a battery generator and a battery generator. Among them, a battery generator is connected to the battery and can supply power to the vehicle after power generation. The electronic equipment, and or the battery connected to the battery is charged; and the battery generator is not connected to the battery, generally a generator dedicated to the air conditioning equipment in the vehicle. In detail, when the user turns on an air conditioner such as a fan or air conditioner or other electrical equipment that requires an additional power source, the regulator of the batteryless generator drives the batteryless generator to start power generation by the excitation current provided by the battery generator. In turn, the air conditioner generator can generate electricity normally.

However, it is worth noting that since the batteryless generator is not equipped with a battery, it does not have a warning light design, so when there is an abnormality in the batteryless generator (for example, the output power line is disconnected to form a short circuit, the generator overload output or the motor itself is faulty). When the voltage is too low, the user cannot know the occurrence of this abnormal phenomenon, and therefore the corresponding measures cannot be taken immediately. In this way, when the battery-free generator is abnormal and continues to operate, the battery-free generator may be overheated and damaged, and even the battery-free generator may be ignited due to overheating, resulting in dangerous situations such as burning the car.

Embodiments of the present invention provide a voltage regulator and an overload protection circuit thereof, which can automatically force a batteryless generator to stop outputting power when an abnormality occurs in a batteryless generator to avoid a phenomenon in which a batteryless generator is ignited due to overheating.

Embodiments of the present invention provide an overload protection circuit coupled to a batteryless generator. The overload protection circuit includes a voltage detection circuit and a first switching element. The voltage detecting circuit is coupled between the batteryless generator and the ground. The first switching element is coupled to the voltage detecting circuit and the ground. The voltage detection circuit detects the output voltage of the batteryless generator and generates a voltage detection signal. When the output voltage of the batteryless generator is less than the threshold value, the first switching element is turned on to stop the battery generator from outputting electrical energy.

Another embodiment of the present invention provides a voltage regulator. The voltage regulator is suitable for a batteryless generator and includes a voltage regulating circuit and an overload protection circuit. A voltage regulating circuit is coupled to the batteryless generator. The overload protection circuit is coupled to the batteryless generator, the voltage regulating circuit and the ground terminal. The voltage regulating circuit is used to generate an enable signal. The overload protection circuit is configured to receive the start signal and detect whether the output voltage of the batteryless generator is greater than, equal to, or less than a threshold value. When the overload protection circuit detects that the output voltage continues to be less than the threshold value, the overload protection circuit outputs a protection signal to the voltage regulation circuit after a delay time according to the startup signal, and the voltage regulation circuit causes the battery-free generator to stop output according to the protection signal. Electrical energy.

The embodiment of the invention further provides a batteryless generator system. The batteryless generator system includes a batteryless generator and a voltage regulator. The batteryless generator is coupled to at least one load. The voltage regulator is coupled to the batteryless generator for detecting an output voltage of the batteryless generator. When the voltage regulator continuously detects that the output voltage is less than the threshold value, the voltage regulator stops the battery generator from outputting power after a delay time.

In summary, the voltage regulator and the overload protection circuit thereof according to the embodiments of the present invention can automatically force the battery-free generator to stop operating when an abnormality occurs in the battery-free generator, and can further delay the conduction through the delay circuit. A switching element can avoid the malfunction of the overload protection circuit.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

1‧‧‧No battery generator system

11‧‧‧Voltage regulator

13‧‧‧No battery generator

110‧‧‧Voltage adjustment circuit

120‧‧‧Overload protection circuit

121‧‧‧Voltage detection circuit

122, 125‧‧‧Switching elements

123‧‧‧ Current limiting components

124‧‧‧Delay circuit

B‧‧‧Output voltage

C1, C2‧‧‧ capacitor

D‧‧‧voltage detection signal

GND‧‧‧ ground terminal

I‧‧‧Magnetic current

IG‧‧‧External power supply

L‧‧‧ start signal

N‧‧‧ node

P‧‧‧protection signal

LP‧‧‧Overload protection signal

Q1, Q2‧‧‧ NMOS transistor

R1~R4‧‧‧ resistor

ZD1, ZD2‧‧‧Jenner diode

1 is a functional block diagram of a batteryless generator system provided by an embodiment of the present invention.

2 is a schematic diagram of a detailed circuit of an overload protection circuit according to an embodiment of the present invention.

Various illustrative embodiments are described more fully hereinafter with reference to the accompanying drawings. However, the inventive concept may be embodied in many different forms and should not be construed as being limited to the illustrative embodiments set forth herein. Rather, these exemplary embodiments are provided so that this invention will be in the In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Similar numbers always indicate similar components.

The embodiment of the invention provides a voltage regulating circuit with an overload protection circuit, which determines whether the output voltage of the batteryless generator is less than the threshold value through the voltage detecting circuit, and the voltage detecting circuit determines that the output voltage of the batteryless generator continues to be less than the threshold. At the time of the value, the delay circuit receives the start signal. If the voltage detecting circuit continuously detects that the output voltage of the batteryless generator is less than the threshold value, the delay circuit outputs the overload protection signal to the first switching element after a delay time according to the continuously received starting signal. Correspondingly, the first switching element is turned on according to the overload protection signal, causing the batteryless generator to stop outputting electrical energy. In this way, the overload protection circuit can automatically force the battery-free generator to stop operating when an abnormality occurs in the battery-free generator.

[Example of a batteryless generator system]

Please refer to FIG. 1. FIG. 1 is a functional block diagram of a batteryless generator system according to an embodiment of the present invention. The batteryless generator system 1 includes a voltage regulator 11 and a batteryless generator 13. The voltage regulator 11 is coupled to the batteryless generator 13.

The voltage regulator 11 receives the external power source IG and correspondingly generates an exciting current I to the batteryless generator 13, causing the batteryless generator 13 to start generating electricity. Further, the voltage regulator 11 can detect the output voltage B of the batteryless generator 13 to determine whether or not the battery generator 13 is abnormal. If the voltage regulator 11 determines that an abnormality has occurred in the batteryless generator 13, the battery generator 13 is automatically forcibly stopped to prevent the battery generator 13 from being overheated and burned. It is worth noting that after the battery-free generator 13 starts generating electricity, the voltage regulator 11 can also be used to adjust the amount of power generated by the battery-free generator 13.

The batteryless generator 13 is connected to at least one load (not shown), such as an air conditioner such as a fan and air conditioner, to supply power to the connected load. It is worth noting that the invention does not limit the possible aspects of the load.

Further, the voltage regulator 11 includes a voltage regulation circuit 110 and an overload protection circuit 120. In this embodiment, the voltage regulating circuit 110 is coupled to a system (not shown) that generates an external power source IG, such as a battery generator; the voltage regulating circuit 110 is further coupled to the overload protection circuit 120 and the batteryless generator. 13 excitation coil (not shown). The overload protection circuit 120 is coupled to the batteryless generator 13.

The voltage regulating circuit 110 receives the external power source IG and generates an exciting current I and an enable signal L. In this embodiment, the voltage regulating circuit 110 is coupled to the system for generating the external power source IG through an external switch (not shown). The voltage regulating circuit 110 obtains the external power source IG from the system after the external switch is turned on (ie, the external switch is in a closed state). The voltage adjustment circuit 110 generates an excitation current I and an enable signal L in accordance with the external power source IG. The voltage regulating circuit 110 transmits the exciting current I to the exciting coil of the batteryless generator 13, and drives the generator rotor to perform magnetic field cutting by the engine, so that the batteryless generator 13 starts generating electricity. No battery generator 13 is normal After the power generation, the voltage regulating circuit 110 can rectify the current through the excitation coil of the batteryless generator 13 to correspondingly control the amount of power generated by the batteryless generator 13, and the voltage regulating circuit 110 can generate a high voltage level according to the external power source IG. The enable signal L is transmitted to the protection circuit 120.

The overload protection circuit 120 detects whether the output voltage B of the batteryless generator 13 is less than a threshold value. When the overload protection circuit 120 detects that the output voltage B of the batteryless generator 13 is less than the threshold value, and confirms that the abnormal phenomenon of the batteryless generator 13 is established, the overload protection circuit 120 will activate the signal according to the high voltage level. L generates a protection signal P. The overload protection circuit 120 transmits the protection signal P to the voltage regulation circuit 110 to cause the voltage regulation circuit 110 to force the batteryless generator 13 to stop outputting electrical energy.

In the above embodiment, the method for confirming that the abnormality of the batteryless generator 13 is established is, for example, setting a delay circuit and setting a delay time during which the overload protection circuit 120 continuously detects the batteryless generator. When the output voltage B of 13 is less than the threshold value, the overload protection circuit 120 generates and transmits the protection signal P to the voltage regulation circuit 110 to avoid false positives. Actually, it is not necessary to provide the delay circuit, that is, when the overload protection circuit 120 detects that the output voltage B of the batteryless generator 13 is less than the threshold value, the protection signal P is generated and transmitted to the voltage adjustment circuit 110. .

In the above embodiment, the batteryless generator system 1 is, for example, a batteryless generator system for a vehicle air conditioner, but the practical application is not limited thereto, and any generator system not equipped with a battery can use the overload protection proposed by the present invention. The circuit is used for overload protection.

Next, relevant details of the overload protection circuit 120 will be further described. Please refer to FIG. 2. FIG. 2 is a schematic diagram of a detailed circuit of an overload protection circuit according to an embodiment of the present invention. The overload protection circuit 120 includes a voltage detection circuit 121, a switching element 122, a current limiting element 123, a delay circuit 124, and a switching element 125. The voltage detecting circuit 121 is coupled between the batteryless generator 13 and the ground GND. Switching element 122 The voltage detecting circuit 121, the current limiting element 123, the delay circuit 124, and the ground GND are coupled. The current limiting component 123 is coupled to the voltage regulating circuit 110. The delay circuit 124 is coupled to the switching element 125 and the ground GND. The switching element 125 is coupled between the voltage regulating circuit 110 and the ground GND.

In this embodiment, the voltage detecting circuit 121 is configured to detect the output voltage B of the batteryless generator 13 and correspondingly generate the voltage detecting signal D. The voltage detecting circuit 121 transmits the voltage detecting signal D to the switching element 122 to correspondingly control the opening and closing of the switching element 122. The delay circuit 124 is configured to receive the high voltage level enable signal L through the current limiting element 123, and generate the overload protection signal LP according to the high voltage level enable signal L. The delay circuit 124 transmits the overload protection signal LP to the switching element 125 to control the switching element 125 to assume an on state.

In detail, when the voltage detecting circuit 121 detects that the output voltage B of the batteryless generator 13 is less than a threshold value, the switching element 122 is turned off according to the voltage detecting signal D. When the switching element 122 is turned off, the high voltage level enable signal L is transmitted to the delay circuit 124 through the current limiting element 123. It should be noted that if the voltage detecting circuit 121 continuously detects that the output voltage B is less than the threshold, the switching element 122 will continue to be turned off, and the delay circuit 124 will respond to the received high voltage level. L transmits the overload protection signal LP to the switching element 125 after a delay time to turn on the switching element 125. When the switching element 125 is turned on, the voltage regulating circuit 110 correspondingly receives the protection signal P to cut off the exciting current of the batteryless generator 13, so that the batteryless generator 13 stops outputting electric energy.

On the other hand, when the voltage detecting circuit 121 detects that the output voltage B of the batteryless generator 13 is greater than the threshold value, the switching element 122 is turned on according to the voltage detecting signal D. It should be noted that when the switching element 122 is turned on, the high voltage level enable signal L is directly introduced into the ground GND through the current limiting element 123 and the switching element 125. Therefore, when the output voltage B is greater than the threshold value, the delay circuit 124 cannot obtain the high voltage level enable signal L through the current limiting element 123, so the delay circuit 124 does not generate the overload protection signal LP to turn on the switching element 125.

As such, the overload protection circuit 120 can transmit the protection signal P to the voltage regulation when the output voltage B of the batteryless generator 13 is too low (ie, when the battery generator 13 is in an abnormal state, for example, an overload phenomenon or other failure problem occurs). The circuit 110 is configured to cause the voltage regulating circuit 110 to force the batteryless generator 13 to cease operation.

In this embodiment, the voltage detecting circuit 121 includes a Zener diode ZD1, a resistor R1, a capacitor C1, and a resistor R2. The cathode of the Zener diode ZD1 is coupled to the batteryless generator 13 and the anode of the Zener diode ZD1 is coupled to one end of the resistor R1. One end of the capacitor C1 and the resistor R2 are coupled to the other end of the resistor R1, and the other end of the capacitor C1 and the resistor R2 are coupled to the ground GND. It is worth mentioning that the Zener diode ZD1 is used to receive the output voltage B of the batteryless generator 13, and the resistor R1 and the resistor R2 can be regarded as a voltage dividing circuit for the anode of the Zener diode ZD1. The voltage is divided to transmit the voltage detection signal D to the switching element 122 by the node N (the junction of the resistor R1 and the resistor R2). Capacitor C1 can be regarded as a filter capacitor for filtering the voltage of node N.

The switching element 122 is an NMOS transistor Q1. The NMOS transistor Q1 has a drain coupled to the other end of the resistor R3, a cathode of the Zener diode ZD2, and one end of the capacitor C2. The source of the NMOS transistor Q1 is coupled to the ground GND, and the gate of the NMOS transistor Q1 is coupled. The other end of the resistor R1, one end of the capacitor C1, and one end of the resistor R2.

The current limiting element 123 is an impedance element, such as resistor R3. One end of the resistor R3 is coupled to the voltage regulating circuit 110, and the other end of the resistor R3 is coupled to the delay circuit 124.

The delay circuit 124 includes a capacitor C2, a Zener diode ZD2, and a resistor R4. One end of the capacitor C2 is coupled to the other end of the resistor R3, and the other end of the capacitor C2 is coupled to the ground GND. The cathode of the Zener diode ZD2 is coupled to the other end of the resistor R3 and one end of the capacitor C2, and the anode of the Zener diode ZD2 is coupled to one end of the resistor R4. The other end of the resistor R4 is coupled to the ground GND.

The switching element 125 is an NMOS transistor Q2. The drain of the NMOS transistor Q2 is coupled to the voltage regulating circuit 110, and the source of the NMOS transistor Q2 is coupled to the ground. GND, and the gate of the NMOS transistor Q2 is coupled to the anode of the Zener diode ZD2 and one end of the R4 resistor.

When the output voltage B of the batteryless generator 13 is less than the threshold value, the voltage dividing circuit composed of the resistor R1 and the resistor R2 transmits the voltage detecting signal D from the node N to the NMOS transistor Q1, and the NMOS transistor Q1 is The received voltage detection signal D is in an off state. When the NMOS transistor Q1 is in the off state, the overload protection circuit 120 transmits the protection signal P to the voltage adjustment circuit 110. On the contrary, when the output voltage B of the batteryless generator 13 is greater than the threshold value, the piezoelectric routing node N transmits the voltage detection signal D to the NMOS transistor Q1, and the NMOS transistor Q1 detects according to the received voltage. Signal D is in an on state. When the NMOS transistor Q1 is in the on state, the overload protection circuit 120 does not transmit the protection signal P to the voltage regulating circuit 110, and thus the voltage regulating circuit 110 does not force the batteryless generator 13 to stop operating.

For example, assume a threshold of 20 volts. When the Zener diode ZD1 receives an output voltage B (eg, 22V) greater than 20 volts, the output voltage B is greater than the breakdown voltage of the Zener diode ZD1 (eg, 18V), and the voltage of the voltage divider circuit at node N The voltage greater than the turn-on voltage of the NMOS transistor Q1, that is, the voltage of the voltage detecting signal D is greater than the turn-on voltage of the NMOS transistor Q1. Therefore, the NMOS transistor Q1 is turned on. Conversely, when the output diode B of the Zener diode ZD1 receives less than 20 volts (for example, 16V), the output voltage B is smaller than the breakdown voltage of the Zener diode ZD1 (for example, 18V), so the voltage dividing circuit The voltage of the node N is 0 V smaller than the turn-on voltage of the NMOS transistor Q1, that is, the voltage of the voltage detecting signal D is smaller than the turn-on voltage of the NMOS transistor Q1. Therefore, the NMOS transistor Q1 is not turned on.

Furthermore, when the NMOS transistor Q1 is turned on, the high voltage level enable signal L is introduced to the ground GND through the resistor R3 and the NMOS transistor Q1, so the NMOS transistor Q2 does not receive the high voltage through the resistor R3. The start signal L of the level.

On the other hand, when the NMOS transistor Q1 is turned off, the high voltage level is turned on. The dynamic signal L charges the capacitor C2 through the resistor R3. At this time, if the voltage detecting circuit 121 continuously detects that the output voltage B is less than the threshold value, the high voltage level starting signal L will continue to charge the capacitor C2, and when the voltage of one end of the capacitor C2 is greater than the magnitude of the second pole When the breakdown voltage of the body ZD2, the Zener diode ZD2 transmits the overload protection signal LP to the NMOS transistor Q2 to turn on the NMOS transistor Q2. Next, the NMOS transistor Q2 transmits the protection signal P to the voltage adjustment circuit 110. In this manner, the voltage adjustment circuit 110 can automatically force the batteryless generator 13 to stop outputting power based on the received protection signal P when an abnormality occurs in the batteryless generator 13.

It should be noted that the NMOS transistor Q2 can be delayed by the charging time of the capacitor C2 of the delay circuit 124 and the level of the breakdown voltage of the Zener diode ZD2, that is, the NMOS transistor Q2 is extended. The latter delay time is turned on, wherein the delay time is that the high voltage level enable signal L continues to charge the capacitor C2 until the voltage of the anode of the diode ZD2 turns on the NMOS transistor Q2. .

Briefly, when the voltage detecting circuit 121 detects that the output voltage B of the batteryless generator 13 is less than the threshold value, the voltage detecting circuit 121 detects the output voltage B of the batteryless generator 13 during the delay time. If the threshold value is greater than the threshold value, the delay circuit 124 does not generate the overload protection signal LP, and the batteryless generator 13 still outputs power normally. On the other hand, if the voltage detecting circuit 121 continuously detects that the output voltage B is less than the threshold value, the delay circuit 124 generates the overload protection signal LP after a delay time according to the received high voltage level activation signal L. The batteryless generator 13 will be forced to stop outputting electrical energy. Therefore, the voltage regulator 11 proposed by the present invention can avoid the occurrence of a phenomenon in which the battery-free generator 13 is stopped from outputting power due to instantaneous noise interference.

In this embodiment, the delay time is between 2.5 seconds and 4 seconds, but the embodiment of the present invention does not limit the length of the delay time. The person skilled in the art can change the capacitor C2 and the capacitor according to actual needs. Nanodiode ZD2 and resistor R1 specifications and types.

In the above embodiment, the overload protection circuit 120 uses the sense diodes ZD1 and ZD2 as a voltage comparison component, but those skilled in the art can replace other components with voltage comparison functions, such as a voltage comparator or multiple. A series of forward diodes.

In addition, it should be noted that the voltage regulating circuit 110 includes a switching component (not shown) coupled to the excitation coil of the batteryless generator 13 (not shown) and the drain of the NMOS transistor Q2. Wherein the switching element can be an NMOS transistor. When the voltage adjustment circuit 110 receives the protection signal P, the voltage adjustment circuit 110 causes the switching element to assume an off state according to the protection signal P, thereby cutting off the excitation current of the batteryless generator 13, so that the batteryless generator 13 cannot output. Electricity.

It should be noted that before the battery-free generator 13 generates power, the voltage regulating circuit 110 generates a low-voltage level start signal L. At this time, the low-voltage level enable signal L cannot be used for the capacitor C2 of the delay circuit 124. Charging is performed, so that the NMOS transistor Q2 of the delay circuit 124 is not turned on before the battery generator 13 generates the output voltage B, so that the switching elements in the voltage regulating circuit 110 are not turned off, and can be avoided. The phenomenon of the excitation current of the batteryless generator 13 is erroneously cut off, that is, the phenomenon that the battery generator 13 is forcibly stopped by the voltage regulating circuit 110 before the power generation of the batteryless generator 13 is prevented.

It should be noted that, in addition to the start signal L of the high voltage level generated by the external power source IG, the voltage regulating circuit 110 can also generate the start signal L according to a phase signal inside the batteryless generator. This embodiment does not limit the voltage adjustment. Circuit 110 produces a possible aspect of the enable signal L.

[Effects of possible examples]

In summary, the voltage regulator and the overload protection circuit thereof according to the embodiments of the present invention can generate an overload protection signal after a delay time after the output voltage of the batteryless generator is less than the threshold value, and Corresponding to the forced interruption of the excitation current of the batteryless generator, it is possible to confirm the abnormal phenomenon of the batteryless generator. After the establishment, it is only for the purpose of forcing the battery-free generator to stop outputting electric energy. That is, the overload protection circuit of the embodiment of the present invention adds an appropriate delay time for buffering, thereby avoiding the occurrence of an error at a wrong time point (for example, an instantaneous overload phenomenon caused by a load or an instantaneous noise interference). The motor stops outputting power to avoid possible malfunction of the overload protection circuit. Therefore, the voltage regulator and the overload protection circuit thereof according to the embodiments of the present invention can prevent the occurrence of malfunctions by forcibly stopping the output of the batteryless generator when an abnormality occurs in the batteryless generator.

The drawings and the descriptions of the present invention are only examples of the present invention, and are not intended to limit the present invention. Anyone skilled in the art can make various changes and refinements according to the above description. The simple equivalent changes and modifications made by the scope of the invention and the description of the invention are still within the scope of the invention.

1‧‧‧ Batteryless air conditioning system

11‧‧‧Voltage regulator

13‧‧‧No battery generator

110‧‧‧Voltage adjustment circuit

120‧‧‧Overload protection circuit

121‧‧‧Voltage detection circuit

122, 125‧‧‧Switching elements

123‧‧‧ Current limiting components

124‧‧‧Delay circuit

B‧‧‧Output voltage

C1, C2‧‧‧ capacitor

D‧‧‧voltage detection signal

GND‧‧‧ ground terminal

I‧‧‧Magnetic current

IG‧‧‧External power supply

L‧‧‧ start signal

N‧‧‧ node

P‧‧‧protection signal

LP‧‧‧Overload protection signal

Q1, Q2‧‧‧ NMOS transistor

R1~R4‧‧‧ resistor

ZD1, ZD2‧‧‧Jenner diode

Claims (11)

An overload protection circuit coupled to a batteryless generator, the overload protection circuit includes: a voltage detection circuit coupled between the batteryless generator and a ground terminal for detecting the batteryless generator An output voltage generates a voltage detection signal; a first switching element coupled to the voltage detecting circuit; a delay circuit coupled to the ground and receiving an enable signal to generate an overload protection signal, wherein the a switching element is controlled by the overload protection signal; and a second switching element is coupled to the voltage detecting circuit, the grounding end and the delay circuit, wherein the second switching element is controlled by the voltage detecting signal; wherein When the output voltage of the batteryless generator is less than a threshold, the first switching element is turned on to stop the battery generator from outputting power, and the second switching element is turned off according to the voltage detection signal, and when When the second switching element is turned off, the delay circuit receives the start signal, and if the delay circuit continues to receive the start signal, the delay circuit loses after a delay time. The overload protection signal is to the first switching element; when the output voltage is greater than the threshold value, the second switching element is turned on according to the voltage detection signal, and when the second switching element is turned on, the first switch The component is in the off state. The overload protection circuit of claim 1, further comprising: a current limiting component, wherein one end of the current limiting component is coupled to the activation signal, and the other end of the current limiting component is coupled to the delay circuit and the second Switching element. The overload protection circuit of claim 2, wherein the delay circuit comprises: a first capacitor, one end of the first capacitor is coupled to the other end of the current limiting component and the second switching component, and the first The other end of the capacitor is coupled to the ground; a first voltage comparison component, the cathode of the first voltage comparison component is coupled to the cathode The other end of the current limiting component, the second switching component and one end of the first capacitor; and a first resistor, one end of the first resistor is coupled to the anode of the first voltage comparison component and the first switching component, and The other end of the first resistor is coupled to the ground; wherein, when the output voltage is less than the threshold, the second switching element is turned off and the enable signal charges the first capacitor through the current limiting component, if The start signal continuously charges the first capacitor, and when the voltage of one end of the first capacitor is greater than the breakdown voltage of the first voltage comparison component, the voltage of the anode of the first voltage comparison component turns on the first switch element. The overload protection circuit of claim 3, wherein the enable signal is at a high voltage level, and the delay time is that the start signal continues to charge the first capacitor until the first voltage comparison component turns on the first The elapsed time of a switching element. The overload protection circuit of claim 3, wherein the voltage detection circuit comprises: a second voltage comparison component, the cathode of the second voltage comparison component is coupled to the batteryless generator; and a second resistor One end of the second resistor is coupled to the anode of the second voltage comparison component; a second capacitor is coupled to the other end of the second resistor, and the other end of the second capacitor is coupled to the ground terminal; And a third resistor, one end of the third resistor is coupled to one end of the second capacitor, the other end of the second resistor, and the second switching component, and the other end of the third resistor is coupled to the ground. The overload protection circuit of claim 3, wherein the first switching element is an NMOS transistor, and the drain of the NMOS transistor is coupled to an excitation of the batteryless generator through an external third switching element. Coil, the NMOS transistor a source is coupled to the ground, and a gate of the NMOS transistor is coupled to an anode of the first voltage comparison component and an end of the first resistor to receive the overload protection signal, wherein when the NMOS transistor is turned on The third switching element assumes an off state to stop the batteryless generator from outputting electrical energy. The overload protection circuit of claim 6, wherein the second switching element is an NMOS transistor, and the drain of the NMOS transistor is coupled to the other end of the current limiting element and the cathode of the first voltage comparison element. And the one end of the first capacitor, the source of the NMOS transistor is coupled to the ground, the gate of the NMOS transistor is coupled to the other end of the second resistor, the end of the second capacitor, and the third resistor One end receives the voltage detection signal. The overload protection circuit of claim 1, wherein the delay time is between 2.5 seconds and 4 seconds. A voltage regulator is applicable to a batteryless generator, the voltage regulator includes: a voltage regulating circuit coupled to the batteryless generator for generating a start signal; and an overload protection circuit coupled to the batteryless The generator, the voltage regulating circuit and a ground terminal are configured to receive the start signal and detect an output voltage of the batteryless generator; wherein, when the overload protection circuit detects that the output voltage continues to be less than a threshold value, The overload protection circuit outputs a protection signal to the voltage regulation circuit after a delay time according to the startup signal, and the voltage regulation circuit stops the battery generator from outputting power according to the protection signal. The voltage regulator according to claim 9, wherein the activation signal is generated by the voltage adjustment circuit according to a phase signal of the batteryless generator, or the activation signal is the voltage adjustment circuit according to a battery generator An external power source is transmitted. A batteryless generator system comprising: a batteryless generator coupled to at least one load; a voltage regulator coupled to the batteryless generator for detecting an output voltage of the batteryless generator; wherein the voltage regulator continuously detects that the output voltage is less than a threshold value The battery-free generator stops outputting power after a delay time.