CN109188980A - The power control method and card reader of card reader - Google Patents

Abstract

The present invention provides the power control method and card reader of a kind of card reader.This method comprises: detecting that ETC card is inserted into card reader, and the power supply for controlling the card reader is powered to the card reader；When the duration that the card reader does not receive operational order is greater than or equal to preset duration, the power supply for controlling the card reader stops powering to the card reader.The problem of method provided by the invention can be avoided card reader for a long time when being not received by operational order, and the power supply of card reader is still powered to card reader, and the electric quantity of power supply of card reader is caused to be lost, so as to energy saving.

Description

Card reader power control method and card reader

technical field

Embodiments of the present invention relate to the field of electronic technology, and in particular, to a power control method for a card reader and a card reader.

Background technique

At present, a wireless card reader can be used to make money on Electronic Toll Collection (ETC) cards. The user inserts the ETC card into the wireless card reader and controls the power in the wireless card reader to the wireless card reader. Power on, make the wireless card reader in working mode, and users can use the mobile APP to make money on the ETC card through the wireless card reader.

At present, the process of controlling the power supply in the wireless card reader to supply power to the wireless card reader is generally as follows: after the user disassembles the ETC card into the wireless card reader, the user presses the power mechanical button on the wireless card reader to make the power supply to the wireless card reader. The card reader is powered to keep the wireless card reader in working mode. If the user presses the power mechanical button again, the power supply stops supplying power to the wireless card reader, so that the wireless card reader exits the working mode.

It can be seen that after the user has used the wireless card reader to make money on the ETC card, if the user does not press the mechanical button of the power supply, the wireless card reader will always be in the working mode, causing the power loss of the power supply and wasting energy.

SUMMARY OF THE INVENTION

The invention provides a power control method for a card reader and a card reader, which are used to solve the loss of power of the card reader due to the lack of a mechanical button to turn off the power of the card reader when the card reader is no longer used. The problem of wasting energy.

One aspect of the present invention provides a power control method for a card reader, comprising:

Detecting that the ETC card is inserted into the card reader, and controlling the power supply of the card reader to supply power to the card reader;

When the period of time that the card reader does not receive an operation instruction is greater than or equal to a preset period of time, the power supply of the card reader is controlled to stop supplying power to the card reader.

In some embodiments, after the controlling the power supply of the card reader to supply power to the card reader, the method further includes:

It is detected that the ETC card is pulled out from the card reader, and the power supply of the card reader is controlled to stop supplying power to the card reader.

A second aspect of the present invention provides a card reader, comprising: a main power supply, an internal power supply, a card slot, a card slot detection circuit, a controller, and a main power supply on-off circuit;

The main power supply is connected to the internal power supply, the card slot detection circuit, the controller, and the power supply on-off circuit;

The controller is connected to the internal power supply, the card slot detection circuit, and the power supply on-off circuit;

The internal power supply is used to output power to the card slot detection circuit and the controller when the internal power supply is turned on;

The card slot detection circuit is used to control the main power supply on-off circuit to be turned on when the ETC card is inserted into the card slot;

The main power supply on-off circuit is used to control the main power supply to output electric energy when the main power supply on-off circuit is turned on;

The controller is used to receive an operation instruction, and operate the ETC card according to the operation instruction. The power on-off circuit is disconnected;

The main power supply on-off circuit is further configured to control the main power supply to stop outputting electric energy when the main power supply on-off circuit is disconnected.

In some embodiments, the card slot detection circuit includes: a card switch, the card switch is connected to the main power on-off circuit;

The card switch is used for conducting when the ETC card is inserted into the card slot, and controlling the main power supply on-off circuit to conduct when the card switch is on.

In some embodiments, the card slot detection circuit further includes: a card detection circuit, the card detection circuit is connected to the card switch, the controller, and the internal power supply;

The card switch is also used to disconnect when the ETC card is pulled out from the card slot;

The card detection circuit is used to output a disconnection instruction to the controller when the card switch is disconnected;

The controller is further configured to control the main power supply to turn on when the controller receives the disconnection instruction, or when the controller does not receive the operation instruction for a duration greater than or equal to a preset duration. The circuit breaker is disconnected.

In some embodiments, the power supply on-off circuit includes: a pulse generation circuit, an on-off control circuit, and an on-off execution circuit, the on-off execution circuit is connected to the main power supply and the internal power supply, and the on-off execution circuit is connected to the main power supply and the internal power supply. The on-off control circuit is connected with the on-off execution circuit and the pulse generation circuit; the pulse generation circuit is connected with the card slot detection circuit and the on-off control circuit;

The card slot detection circuit is used to control the pulse generating circuit to generate a high-level pulse when the ETC card is inserted into the card slot;

The pulse generating circuit is used to control the on-off control circuit to conduct when the pulse generating circuit generates a high-level pulse;

The on-off execution circuit is used to control the power supply to output electric energy when the on-off execution circuit is turned on;

The on-off control circuit is configured to control the on-off execution circuit to remain on when the on-off control circuit is turned on.

In some embodiments, the on-off control circuit is connected to the controller;

The controller is configured to control the on-off control circuit to be turned on after the internal power supply outputs electrical energy.

In some embodiments, the controller is configured to control the disconnection instruction after the controller receives the disconnection instruction or when the controller does not receive the operation instruction for a period of time greater than or equal to a preset period of time. The control circuit is disconnected;

The on-off control circuit is configured to control the on-off execution circuit to be off when the on-off control circuit is off.

In some embodiments, the disconnection indication is a high-level signal; the card detection circuit includes a first controllable element; one end of the first controllable element is connected to the card switch, and the other end is connected to the card switch. controller connection;

the first controllable element for disconnecting when the card switch is disconnected;

The controller is configured to receive a high-level signal when the first controllable element is disconnected, and control the power supply on-off circuit to disconnect according to the high-level signal.

In some embodiments, the pulse generating circuit includes: a capacitor connected between one end of the on-off control circuit and the card switch;

The capacitor is used for charging when the card switch is turned on, and sends a high-level pulse to the on-off control circuit during the charging process.

In some embodiments, the on-off execution circuit includes: a second controllable element, one end of the second controllable element is connected to the on-off control circuit, one end is connected to the power supply, and one end is connected to the internal power connection;

The second controllable element is used to control the main power supply to output electric energy when the second controllable element is turned on, and to control the main power supply to stop outputting electric energy when the second controllable element is turned off.

In some embodiments, the on-off control circuit includes: a third controllable element and a fourth controllable element, one end of the third controllable element is connected to the pulse generating circuit, and the other end is connected to the on-off circuit an execution circuit is connected, one end of the fourth controllable element is connected to the controller, and the other end is connected to the on-off execution circuit;

the pulse generating circuit, for controlling the third controllable element to conduct when the pulse generating circuit generates a high-level pulse;

The controller is configured to send a high-level signal to the fourth controllable element after the power supply outputs electrical energy, after the controller receives the disconnection instruction or the controller does not receive When the duration of the operation instruction is greater than or equal to the preset duration, send a low-level signal to the fourth controllable element;

the third controllable element is used to conduct when receiving a high-level pulse;

The fourth controllable element is configured to be turned on when receiving a high-level signal, and turned off when receiving an electrical low-level signal;

The on-off execution circuit is configured to receive a low-level signal when the third controllable element and/or the fourth controllable element are turned on, and control the main power supply to output power according to the low-level signal .

The embodiment of the present invention provides a power control method for a card reader and a card reader. By using the ETC card as the switch of the card reader, when the ETC card is inserted into the card reader, the power of the card reader can be supplied to the card reader. Power supply, when the ETC card is pulled out from the card reader, the power supply of the card reader stops supplying power to the card reader. More importantly, the card reader has the function of automatic timeout and power off, that is, after the ETC card is inserted, if there is no operation command to the card reader for a long time, the power supply of the card reader will stop supplying power to the card reader. When the card reader does not receive an operation command for a long time, the power supply of the card reader still supplies power to the card reader, causing the problem of loss of power of the card reader, thereby saving energy.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a flowchart of a power control method for a card reader according to an embodiment of the present invention;

2 is a schematic structural diagram of a card reader according to an embodiment of the present invention;

3 is a schematic structural diagram of a card reader provided by another embodiment of the present invention;

4 is a schematic structural diagram of a card reader according to another embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a card reader according to another embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 1 is a flowchart of a power control method for a card reader according to an embodiment of the present invention. As shown in FIG. 1 , the method of this embodiment may be applied to a card reader, and the method may include:

S101. It is detected that the ETC card is inserted into the card reader, and the power supply of the card reader is controlled to supply power to the card reader.

In this embodiment, after the ETC card is inserted into the card reader, the card reader detects that the ETC card is inserted into the card reader, and then the card reader controls the power of the card reader to supply power to the card reader, so that the card reader The information of ETC card can be read.

Optionally, after the card reader reads the information of the ETC card, the user can send an operation instruction to the card reader through the APP software. After receiving the operation instruction, the card reader performs corresponding operations on the ECT card according to the operation instruction, for example: Misappropriation of money operations, balance query operations, etc.

S102 , when the time period for which the card reader does not receive an operation instruction is greater than or equal to a preset time period, control the power supply of the card reader to stop supplying power to the card reader.

In this embodiment, since the card reader can receive an operation instruction for operating the ETC card, when the card reader receives an operation instruction, it starts timing, and if the card reader receives the next operation instruction , then reset the previously timed value to zero and then restart the time. The value timed by the card reader indicates the length of time that the card reader does not receive an operation command. The card reader can judge in real time whether the duration is less than the preset duration. If the duration is greater than or equal to the preset duration, it means that the user has not operated the ETC card for a long time. In order to save the power of the card reader, the card reader controls the card reader. The power supply of the card reader stops supplying power to the card reader, that is, the card reader stops outputting power; if the duration is less than the preset duration, the card reader continues to time and waits to receive an operation command. The preset duration is set by itself according to user requirements, which is not limited in this embodiment of the present invention.

In some embodiments, after the card reader controls the power of the card reader to supply power to the card reader, the user pulls the ETC card out of the card reader, and the card reader can detect that the ETC card is removed from the card reader Pull out, the card reader does not need to work at this time, in order to save power, the card reader controls the power supply of the card reader to stop supplying power to the card reader. Inserting the ETC card into the card reader is equivalent to opening the card reader; pulling the ETC card out of the card reader is equivalent to closing the card reader.

In this embodiment, by using the ETC card as the switch of the card reader, when the ETC card is inserted into the card reader, the power supply of the card reader supplies power to the card reader, and when the ETC card is pulled out from the card reader, the card reader The function of the power supply to stop supplying power to the card reader. More importantly, the card reader has the function of automatic timeout and power off, that is, after the ETC card is inserted, if there is no operation command to the card reader for a long time, the power supply of the card reader will stop supplying power to the card reader. When the card reader does not receive an operation command for a long time, the power supply of the card reader still supplies power to the card reader, causing the problem of loss of power of the card reader, thereby saving energy.

FIG. 2 is a schematic structural diagram of a card reader according to an embodiment of the present invention. As shown in FIG. 2 , the card reader includes: a main power supply 10 , an internal power supply 20 , a card slot detection circuit 30 , a controller 40 , a main power supply on-off circuit 50 , and a card slot 60 . in,

The main power supply 10 is connected to the internal power supply 20 , the card slot detection circuit 30 , the controller 40 , and the main power supply on-off circuit 50 .

The controller 40 is connected 50 to the internal power supply 20 , the card slot detection circuit 30 and the main power supply on-off circuit.

Specifically, the main power supply 10 is connected to the card slot detection circuit 30 , the card slot detection circuit 30 is connected to the controller 40 , the card slot detection circuit 30 is connected to the main power supply on-off circuit 50 , and the main power on-off circuit 50 internal power supply 20 Connection, the internal power supply 20 is connected with the card slot detection circuit 30 and the controller 40, the controller 40 is connected with the main power on-off circuit 50, the main power on-off circuit 50 is connected with the main power supply 10, the card slot 60 is connected with the card slot detection circuit Circuit 30 is connected.

The internal power supply 20 is used to output power to the card slot detection circuit 30 and the controller 40 when the internal power supply 20 is turned on.

The card slot detection circuit 30 is used to control the main power on-off circuit 50 to be turned on when the ETC card is inserted into the card slot 60 .

The main power supply on-off circuit 50 is used to control the main power supply 10 to output electric energy when the main power supply on-off circuit 50 is turned on.

The controller 40 is used to receive the operation instruction and operate the ETC card according to the operation instruction. If the controller 40 does not receive the operation instruction for a duration greater than or equal to the preset duration, it controls the main power supply on-off circuit 50 to disconnect .

The main power supply on-off circuit 50 is also used for controlling the main power supply 10 to stop outputting electric energy when the main power supply on-off circuit 50 is disconnected.

Specifically, as shown in FIG. 2 , when the ETC card is inserted into the card slot 60 , the card slot detection circuit 30 is turned on, and the conduction of the card slot detection circuit 30 makes the main power on-off circuit 50 turn on, so the main power is turned on and off. The conduction of the circuit 50 makes the main power supply 10 output power, so the card reader works. The power output by the main power supply 10 is supplied to the internal power supply 20 through the main power supply on-off circuit 50, so that the internal power supply 20 is turned on, and the internal power supply 20 outputs the power to the card slot detection circuit 30 and the controller 40, so the controller 40 can receive To the operation instructions issued by the user, and perform related operations according to the received operation instructions, such as misappropriation of money operations, balance query instructions. When the controller 40 receives an operation command, it starts timing. If the controller 40 receives the next operation command, it resets the previously timed value and restarts the timer. The timed value of the controller 40 indicates that the controller 40 has not The length of time the operation command was received. The controller 40 can judge in real time whether the duration is less than the preset duration. If the duration is greater than or equal to the preset duration, it means that the user has not operated the card reader for a long time. In order to save the power of the card reader, the controller 40 controls the main The power supply on-off circuit 50 is disconnected, and after the main power on-off circuit 50 is disconnected, the main power supply 10 of the control card reader stops supplying power to the card reader, that is, the power supply of the card reader stops outputting power; When the time is set, the controller 40 continues to time and waits for receiving the operation command. The preset duration is set by itself according to user requirements, which is not limited in this embodiment of the present invention.

Optionally, the controller 40 is provided with a timer, and the above-mentioned duration can be timed by the timer in the controller 40. Whenever the controller 40 receives an operation instruction, the timer is cleared and re-timed.

In this embodiment, when the ETC card is inserted into the card slot, the card slot detection circuit is turned on, so as to control the on-off circuit of the power supply to be turned on. When the ETC card is inserted into the card reader, the power supply of the card reader supplies power to the card reader. More importantly, the controller in the card reader can automatically power off the card reader over time, that is, after the ETC card is inserted, if the controller does not receive an operation command for a long time, the controller controls the power supply of the card reader to stop reading. The card reader is powered, thereby avoiding the problem that the power of the card reader is lost because the power of the card reader still supplies power to the card reader when the controller does not receive an operation command for a long time, which can save energy.

FIG. 3 is a schematic structural diagram of a card reader according to another embodiment of the present invention. As shown in FIG. 3 , based on the embodiment shown in FIG. 2 , in this embodiment, the card slot detection circuit 30 includes: a card switch S1 , wherein the card switch S1 is connected to the main power on-off circuit 50 .

The card switch S1 is used to be turned on when the ETC card is inserted into the card slot 60 , and when the card switch S1 is turned on, to control the main power on-off circuit 50 to be turned on.

In some embodiments, the card slot detection circuit 30 further includes: a card detection circuit 301 , wherein the card detection circuit 30 is connected to the card switch S1 and the controller 40 .

The card switch S1 is also used to disconnect when the ETC card is pulled out from the card slot 60 .

The card detection circuit 301 is used to output a disconnection instruction to the controller 40 when the card switch S1 is disconnected.

The controller 40 is further configured to control the main power supply on-off circuit 50 to disconnect when the controller 40 receives a disconnection instruction, or when the controller 40 does not receive an operation instruction for a time period greater than or equal to a preset time period.

In some embodiments, the main power on-off circuit 50 includes: a pulse generation circuit 501 , an on-off control circuit 502 , and an on-off execution circuit 503 . Among them, the on-off execution circuit 503 is connected with the main power supply 10 and the internal power supply 20, the on-off execution circuit 502 is connected with the on-off control appliance 503 and the pulse generation circuit 501, and the pulse generation circuit 501 is connected with the card slot detection circuit 30 and the on-off control circuit. 503 connect. The card slot detection circuit 30 is used to control the pulse generation circuit 501 to generate a high-level pulse when the ETC card is inserted into the card slot 60;

The pulse generating circuit 501 is used to control the on-off control circuit 503 to be turned on when the pulse generating circuit 501 generates a high-level pulse.

The on-off execution circuit 502 is used to control the main power supply 10 to output electric energy when the on-off execution circuit 502 is turned on.

The on-off control circuit 503 is used to control the on-off execution circuit 502 to remain on when the on-off control circuit 503 is turned on.

In some embodiments, the on-off control circuit 503 is connected to the controller 40 .

The controller 40 is configured to control the on-off control circuit 503 to be turned on after the internal power supply 20 outputs power.

In some embodiments, the controller 40 is configured to control the on-off control circuit 503 to be disconnected after the controller 40 receives the disconnection instruction or when the controller 40 does not receive the operation instruction for a duration greater than or equal to a preset duration.

The on-off control circuit 503 is used to control the on-off execution circuit 502 to be off when the on-off control circuit 503 is off.

It should be noted here that, in the above embodiments, the on-off control circuit 503 may include an on-off control circuit 5031 and an on-off control circuit 5032 .

Specifically, as shown in FIG. 3, the main power supply 10 is connected to the on-off execution circuit 502 and the card switch S1, the card switch S1 is connected to the card detection circuit 301 and the pulse generation circuit 501, the card detection circuit 301 is connected to the controller 40, and the pulse The generation circuit 501 is connected to the on-off control circuit 5031, the on-off execution circuit 502 is connected to the internal circuit 20, the internal circuit 20 is connected to the card detection circuit 301 and the controller 40, the controller 40 is connected to the on-off control circuit 5032, and the on-off control The circuit 503 is connected to the on-off execution circuit 502 .

When the ETC card is not inserted into the card slot 60, since the on-off execution circuit 502 is not turned on, the main power supply 10 cannot output power.

When the ETC card is inserted into the card slot 60, the card switch S1 is turned on, and the card switch S1 is turned on so that the card detection circuit 301 is turned on and the main power on-off circuit 50 is turned on. The process of turning on the card switch S1 to turn on the main power supply on-off circuit 50 may be: after the ETC card is inserted into the card slot 60, the card switch S1 is turned on, and the conduction of the card switch S1 causes the pulse generating circuit 501 to generate a A high-level pulse, the high-level pulse is used to control the conduction of the on-off control circuit 5031. The on-off control circuit 5031 is turned on so that the on-off execution circuit 502 is turned on. After the on-off execution circuit 502 is turned on, the main power supply 10 provides power to the internal power supply 20 through the on-off execution circuit 502, and the internal power supply 20 outputs the received power. to the controller 40. After receiving the power output from the internal power supply 20, the controller 40 controls the on-off control circuit 5032 to be turned on. After the on-off control circuit 5032 is turned on, even if the high-level pulse of the pulse generating circuit 501 disappears and the off-control circuit 5031 is disconnected, the on-off control circuit 5032 will continue to keep the on-off execution circuit 502 on, so that the main The power supply 10 can supply power by switching the execution circuit 502 on and off, so that the internal power supply 20 provides power to the controller 40 .

The ETC card is not pulled out from the card slot 60, that is, the card switch is still in the on state, but when the controller 40 does not receive an operation command for a long time, in order to save the power of the card reader, the controller 40 controls the on-off control circuit 5032 to turn off On, after the on-off control circuit 5032 is turned off, the on-off execution circuit 502 is turned off. At this time, if the high-level pulse generated by the pulse generating circuit 501 disappears and the off-control circuit 5031 is turned off, the on-off execution circuit 502 is turned off, so the main power supply 10 cannot supply power to the internal power supply 20 through the on-off execution circuit 502 , so that the internal power supply 20 cannot provide power to the controller 40 , that is, the main power supply 10 in the card reader stops providing power.

Optionally, a timer can be set in the controller 40, and the timer starts timing after the controller 40 receives an operation instruction. If the controller 40 receives the next operation instruction, the timer will count the value previously counted. After clearing, the timer is restarted, and the value on the timer indicates the length of time that the controller 40 does not receive an operation command. The controller 40 can judge in real time whether the duration is less than the preset duration, and if the duration is greater than or equal to the preset duration, it means that the user has not operated the ETC card for a long time. The preset duration is set by itself according to user requirements, which is not limited in this embodiment of the present invention.

When the ETC card is pulled out from the card slot 20, the card switch S1 is turned off, so that the pulse generation circuit 501 and the card detection circuit 301 are disconnected, so the card detection circuit 301 outputs a disconnection instruction to the controller 40, and the disconnection instruction is used for The controller 40 is informed that the ETC card has been pulled out from the card slot 60 . After the controller 40 receives the disconnection instruction, it controls the on-off control circuit 5032 to be disconnected, and the on-off control circuit 5032 is disconnected, so that the on-off execution circuit 502 is disconnected. Therefore, the main power supply 10 cannot provide power to the internal power supply 20, so that the internal power supply 20 cannot output power to the controller 40, that is, the main power supply 10 in the card reader stops providing power.

In this embodiment, when the ETC card is inserted into the card slot, the on-off control circuit is turned on by the high pulse signal generated by the pulse generating circuit, and the on-off control circuit is turned on to turn on the control on-off execution circuit, so that the reading The power supply of the card reader outputs electric energy, which realizes the function that the power supply of the card reader provides electric energy after the ETC card is inserted. The on-off control circuit is controlled by the controller to be turned on, and then the on-off execution circuit is turned on, which ensures that the on-off execution circuit can remain on when the high pulse signal disappears, so that the power supply of the card reader can continue to output power. More importantly, when the ETC card is not pulled out but the controller has not received an operation command for a long time, the on-off control circuit is controlled by the controller to be disconnected, so that the on-off execution circuit is disconnected, and the pulse generation circuit is generated at this time. The high pulse signal of the card reader has disappeared, so the power supply of the card reader stops outputting power. When the ETC is not pulled out but the controller has not received an operation command for a long time, the power supply of the card reader can automatically stop outputting electric energy, thereby reducing the loss of the power supply of the card reader and saving resources.

FIG. 4 is a schematic structural diagram of a card reader according to another embodiment of the present invention. As shown in FIG. 4 , on the basis of the embodiment shown in FIG. 3 , in this embodiment, the disconnection indication is optionally a high-level signal; the card detection circuit 301 includes a first controllable element 301 a , the first controllable element One end of 301 a is connected to the card switch S1 , and the other end is connected to the controller 40 .

The first controllable element 301a is used to turn off when the card switch S1 is turned off.

The controller 40 is configured to receive a high-level signal when the first controllable element 301a is disconnected, and control the power supply on-off circuit 50 to be disconnected according to the high-level signal.

In some embodiments, the pulse generating circuit 501 includes: a capacitor C1, and the capacitor C1 is connected between one end of the on-off control circuit 502 and the card switch S1. Among them, the capacitor CI has the characteristics of charging when the circuit is just turned on, providing a high level, and providing a low level after the charging is completed, so the capacitor C1 can generate a time-sensitive high-level pulse signal.

The capacitor C1 is used for charging when the card switch S1 is turned on, and sends a high-level pulse to the on-off control circuit 502 during the charging process.

In some embodiments, the on-off execution circuit 502 includes: a second controllable element 502a, one end of the second controllable element 502a is connected to the on-off control circuit 503, one end is connected to the main power supply 10, and one end is connected to the internal power supply 20 connect.

The second controllable element 502a is used to control the main power supply 10 to output electric energy when the second controllable element 502a is turned on, and control the main power supply 10 to stop outputting electric energy when the second controllable element 502a is turned off.

In some embodiments, the on-off control circuit 503 includes: a third controllable element 503a and a fourth controllable element 503b, one end of the third controllable element 503a is connected to the pulse generating circuit 501, and the other end is connected to the on-off execution circuit 502 is connected, one end of the fourth controllable element 503b is connected to the controller 40, and the other end is connected to the on-off execution circuit 502.

The pulse generating circuit 501 is used to control the third controllable element 503a to conduct when the pulse generating circuit 501 generates a high-level pulse;

The controller 40 is used to send a high-level signal to the fourth controllable element 503b after the main power supply 10 outputs power, and the time period for which the controller 40 does not receive an operation instruction after receiving the disconnection instruction is greater than or equal to the preset When the time is long, a low level signal is sent to the fourth controllable element 503b.

The third controllable element 503a is used to turn on when receiving a high-level pulse.

The fourth controllable element 503b is configured to be turned on when receiving a high-level signal, and turned off when receiving an electrical low-level signal.

Specifically, as shown in FIG. 4 , the main power supply 10 is connected to the card switch S1 and the second controllable element 502a, the card switch S1 is connected to the first controllable element 301a and the capacitor C1, and the capacitor C1 is connected to the on-off control circuit 503 (ie The third controllable element 503a) is connected, the third controllable element 503a is also connected to the on-off execution circuit 502 (ie the second controllable element 502a), and the second controllable element 502a is connected to the on-off control circuit 503 (ie the fourth controllable element 502a). The control element 502b) and the internal power supply 20 are connected, and the internal power supply 20 is connected with the first controllable element 301a and the controller 40, and the controller 40 is connected with the on-off control circuit 503 (ie, the fourth controllable element 503b).

When the ETC card is not inserted into the card slot 60, since the on-off execution circuit 502 is not turned on, the main power supply 10 cannot provide power.

When the ETC card is inserted into the card slot 60, the card switch S1 is turned on, and the conduction of the card switch S1 makes the first controllable element 301a turn on, and the capacitor C1 starts to charge. Since C1 sends a high-level pulse to the third controllable element 503a during charging, the third controllable element 503a is turned on after receiving the high-level pulse, and after the third controllable element 503a is turned on, it sends a high-level pulse to the second controllable element 502a outputs a low level signal, so the second controllable element 502a is controlled to be turned on, and the card reader starts to work, so that the main power supply 10 provides power to the internal power supply 20 by controlling the second controllable element 502a, and the internal power supply 20 receives the power Power is supplied to the controller 40 afterward. After receiving the power, the controller 40 sends a high-level signal to the fourth controllable element 503b to control the fourth controllable element 503b to conduct, and the conduction of the fourth controllable element 503b also makes the second controllable element 502a on. Therefore, after the fourth controllable element 503b is turned on, even if the charging of the capacitor C1 is completed, a high-level pulse cannot be provided to the third controllable element 503a, so that the third controllable element 503a is turned off, and finally the second controllable element 502a is turned off. is turned on, the fourth controllable element 503b can also keep the second controllable element 502a turned on, thereby ensuring that the main power supply 10 can supply power to the internal power supply 20 through the second controllable element 502a, so that the internal power supply 20 can supply power to the controller 40 provides electrical energy.

When the ETC card is not pulled out from the card slot 60, that is, the card switch S1 is still in the on state, but the controller 40 has not received an operation command for a long time, in order to save the power of the card reader, the controller 40 sends the fourth controllable element 503b sends a low-level signal to control the fourth controllable element 503b to be disconnected. At the same time, due to the timeliness of the charging time of the capacitor C1, at this time, when the capacitor C1 is charged, it cannot provide a high-level pulse to the third controllable element 503a. , so that the third controllable element 503a outputs a high-level signal to the second controllable element 502a, so the second controllable element 502a is disconnected at this time, so the main power supply 10 cannot pass the second controllable element 502a to the internal power supply 20 provides power, so that the internal power supply 20 cannot provide power to the controller 40, that is, the main power supply 10 in the card reader stops providing power.

When the ETC card is pulled out from the card slot 60, the card switch S1 is turned off. At this time, the point B is at a low level, the capacitor C1 begins to discharge, and cannot provide a high-level pulse for the third controllable element 503a, so the third The controllable element 503a is turned off. At the same time, the first controllable element 301a is disconnected, so that after the main power supply 10 outputs power to the internal power supply 20 through the on-off execution circuit 502, the power in the internal power supply 20 is output to the card detection circuit 301. Since the first controllable element 301a is disconnected open, so the power provided by the main power supply 10 flows to the controller 40 through the point E, so the point E becomes a high level, that is, the card detection circuit 301 outputs a high level signal to the controller 40. After receiving the high-level signal, the controller 40 changes the level at point D to a low level, and controls the fourth controllable element 503b to be disconnected, so the second controllable element 502a is disconnected, and finally the main power supply 10 is turned off. The internal power supply 20 cannot output power, and thus the internal power supply 20 cannot provide power to the controller 40 , that is, the main power supply 10 in the card reader stops providing power.

Optionally, the above-mentioned controllable element may be a metal oxide semiconductor (Metal Oxide Semiconductor, MOS) transistor.

In this embodiment, the capacitor charging is time-sensitive. After the ETC card is inserted into the card slot and the card switch is turned on, the high-level pulse generated when the capacitor is charged turns on the third controllable element, thereby controlling the second controllable element. The controllable element is turned on, so that the power supply of the card reader can provide power to the internal power supply, and finally the internal power supply can output power to the controller. At the same time, after the capacitor is charged, the high-level pulse disappears, and the third controllable element is disconnected. At this time, the controller is used to send a high-level signal to the fourth controllable element to control the fourth controllable element to turn on, and then control the third controllable element. The two controllable elements are turned on, so that the second controllable element is kept on, so that the power supply of the card reader can continuously output electric energy. At the same time, when the ETC card is not pulled out but the controller has not received an operation command for a long time, because the high-level pulse disappears after the capacitor is charged, the third controllable element is disconnected, so that the second controllable element cannot be controlled to conduct. , and then use the controller to send a low-level signal to the fourth controllable element to control the fourth controllable element to turn off, and then control the second controllable element to turn off, so the power supply of the card reader stops outputting power. When the ETC is not pulled out but the controller has not received an operation command for a long time, the power supply of the card reader can automatically stop outputting power, thereby reducing the power loss of the power supply of the card reader and saving resources.

FIG. 5 is a schematic structural diagram of a card reader according to another embodiment of the present invention. As shown in FIG. 5 , on the basis of the above-mentioned embodiment shown in FIG. 4 , the first controllable element may be an N-type metal oxide semiconductor (Negative channel Metal Oxide Semiconductor, NMOS) transistor Q1 and a third controllable element. The element may be an NMOS transistor Q3, the fourth controllable element may be an NMOS transistor Q4, and the second controllable element may be a P-type metal oxide semiconductor (positive channel Metal Oxide Semiconductor, PMOS) transistor Q2 as an example for description. The controller 40 may be, for example, a single-chip microcomputer, and the single-chip microcomputer is, for example, a single-chip microcomputer with a model of PAR2801, wherein the function of the single-chip microcomputer can be set by referring to the prior art, thereby realizing the function of the controller 40 . Among them, the NMOS tube has the characteristics that when the gate level of the NMOS tube is higher than the source level, the NMOS tube is turned on; when the gate level is lower than or equal to the source level, the NMOS tube is turned off. The PMOS tube has the characteristics that when the gate level of the PMOS tube is lower than the source level, the PMOS tube is turned on; when the gate level is higher than the source level, the PMOS tube is turned off.

Specifically, as shown in FIG. 5 , the input terminal of the main power supply 10 (ie, the main power supply input in FIG. 5 ) is connected to the source of the PMOS transistor Q2, the first terminal of the resistor R1, and the first terminal of the card switch S1. The card switch The second end of S1 is connected to the gate of NMOS transistor Q1, the first end of resistor R3, and the first end of capacitor C1, and the second end of capacitor C1 is connected to the first end of resistor R6 and the gate of NMOS transistor Q3, The drain of the NMOS transistor Q3 is connected to the drain of the NMOS transistor Q4, the gate of the PMOS transistor Q2 is connected to point A, the second end of the resistor R1 is connected to the gate of the PMOS transistor Q2, and the drain of the PMOS transistor Q2 is connected to the internal power supply 20 The input end of the internal power supply 20 is connected with the first end of the resistor R2 and the first end of the controller 40, the second end of the resistor R2 is connected with the drain of the NMOS transistor Q1 and the second end of the controller 40 (ie E point) connection, the third end (ie D point) of the controller 40 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the gate of the NMOS transistor Q4 and the first end of the resistor R5, the NMOS transistor The drain of Q1, the second end of the resistor R6, the source of the NMOS transistor Q3, the source of the NMOS transistor Q4 and the second end of the resistor R5 are connected and grounded.

When the ETC card is not inserted into the card slot 60, the card switch S1 is turned off, and due to the action of the resistor R1, the gate of the PMOS transistor Q2 (ie point A) is at a high level, so the PMOS transistor Q2 cannot be turned on, so the main power supply The input terminal cannot provide power to the internal power supply 20 through the PMOS transistor Q2 , so the internal power supply 20 cannot provide power to the controller 40 .

When the ETC card is inserted into the card slot 60, the card switch S1 is turned on, the point B is at a high level, and the gate of the NMOS transistor Q1 is at a high level, so the NMOS transistor Q1 is turned on, and at the same time, the current at point B passes through the capacitor C1. , The resistor R6 is grounded to form a loop, so the capacitor C1 starts to charge. During the charging process of the capacitor C1, the point C is at a high level, that is, the gate of the NMOS transistor Q3 is at a high level, so the NMOS transistor Q3 is turned on. Since the point A is grounded through the NMOS transistor Q3, the point A is at a low level, and the gate of the PMOS transistor Q2 is at a low level, so the PMOS transistor Q2 is turned on. After the PMOS transistor Q2 is turned on, the main power input terminal provides power to the internal power supply 20 through the PMOS transistor Q2, and the internal power supply outputs the received power to the controller 40. At this time, the internal power supply 20 can also output power to the resistor R2. Because of this When the NMOS transistor Q1 is turned on, and the NMOS transistor Q1 is grounded, it can be seen from FIG. 5 that the grounding of the NMOS transistor Q1 is equivalent to the grounding at the point E, so at this time, the point E is at a low level. After receiving the power provided by the internal power supply 20, the controller 40 sets the level at point D to a high level, and through the action of the resistor R4, the gate of the NMOS transistor Q4 is at a high level, so the NMOS transistor Q4 is turned on. Therefore, when the capacitor C1 is charged, that is, when the point C is at a low level, even if the NMOS transistor Q3 is turned off, because the NMOS transistor Q4 is turned on under the control of the controller 40, the point A is grounded through the drain of the NMOS transistor Q4, and A The point is still low, thus ensuring that the PMOS transistor Q2 is turned on.

When the card switch S1 is still in the conducting state (ie, the ETC card is not pulled out from the card slot 60 ), but the controller 40 has not received an operation command for a long time, in order to save power, the controller 40 changes the level at point D from The high level is set to a low level, so the gate of the NMOS transistor Q4 is a low level, so the NMOS transistor Q4 is turned off. Since the charging of the capacitor C1 is completed, the point C is at a low level, that is, the gate of the NMOS transistor Q3 is at a low level, so the NMOS transistor Q3 is turned off. At this time, since the NMOS transistor Q3 and the NMOS transistor Q4 are disconnected at the same time, the level at point A is high level, that is, the gate of the PMOS transistor Q2 is high level, so the PMOS transistor Q2 is disconnected, so the main power input terminal cannot be Power is output to the internal power supply 20 through the PMOS transistor Q2, so that the internal power supply 20 cannot provide power to the controller 40, that is, the power supply of the card reader stops supplying power to the card reader.

When the ETC card is pulled out from the card slot 60, the card switch S1 is turned off. Due to the discharge of the capacitor C1, after a period of time point B becomes low level, the gate of the NMOS transistor Q1 is low level, so the NMOS transistor Q1 is disconnected, and the NMOS transistor Q3 is disconnected at the same time. Since the main power input terminal still outputs power to the internal power supply 20 at this time, the internal power supply 20 continues to provide power to the controller 40. At this time, point D is still at a high level. According to the above, the PMOS transistor Q2 is turned on at this time. , so the power at the input end of the main power supply is supplied to the internal power supply 20 through the PMOS transistor Q2, and the internal power supply 20 outputs the power to the resistor R2. Since the NMOS transistor Q1 is turned off, the electric energy flowing to the resistor R2 finally flows through the point E to the controller 40, so the level of the point E changes from a low level to a high level, and the controller 40 detects the electric power at the point E. After the level changes from low level to high level, the level of point D is set to low level, then the gate of NMOS transistor Q4 is also low level, so NMOS transistor Q4 is disconnected, because at this time NMOS transistor Q3 It is also disconnected, so the level at point A becomes high level, so the PMOS transistor Q2 is disconnected, so finally the main power input end stops outputting power to the internal power supply 20, and finally the internal power supply 20 cannot supply the controller 40. Power is supplied, and the card reader's power supply stops supplying power to the card reader.

In this embodiment, due to the timeliness of capacitor charging, when the gate level of the NMOS tube is higher than the source level, the NMOS tube is turned on; when the gate level is lower than or equal to the source level, the NMOS tube is turned off and the PMOS tube is turned off. When the gate level of the tube is lower than the source level, the PMOS tube is turned on; when the gate level is higher than the source level, the PMOS tube is turned off. Using the above characteristics of capacitors, NMOS tubes and PMOS tubes, when the ETC card is inserted into the card slot, the power of the card reader is controlled to provide power to the card reader; when the ETC card is not pulled out from the card slot and has not been connected to the card reader for a long time During operation, control the power supply of the card reader to stop supplying power; when the ETC card is pulled out from the card slot, control the power supply of the card reader to stop supplying power to the card reader. When the ETC card is not pulled out from the card slot and the card reader is not operated for a long time, the power supply of the card reader still provides power to the card reader, resulting in the loss of power, thus saving the power of the card reader. .

It should be noted here that since the function of the capacitor in the pulse generating circuit 501 is to generate a high-level pulse when the card switch S1 is turned on, the capacitor can also be replaced by other electrical components capable of generating a high-level pulse , such as a D flip-flop, therefore, the embodiments of the present invention do not limit the electrical components that generate high-level pulses.

It should be noted here that the embodiment of the present invention does not limit the parameters and models of the electrical components as shown in FIG. 5 , and can be selected according to actual needs.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (12)

1. A power supply control method of a card reader is characterized by comprising the following steps:

detecting that an ETC card is inserted into a card reader, and controlling a power supply of the card reader to supply power to the card reader;

and when the time length that the card reader does not receive the operation instruction is longer than or equal to the preset time length, controlling the power supply of the card reader to stop supplying power to the card reader.

2. The method of claim 1, wherein after controlling the power supply of the card reader to supply power to the card reader, the method further comprises:

and detecting that the ETC card is pulled out of the card reader, and controlling a power supply of the card reader to stop supplying power to the card reader.

3. A card reader, comprising: the device comprises a main power supply, an internal power supply, a clamping groove detection circuit, a controller and a main power supply on-off circuit;

the main power supply is connected with the internal power supply, the card slot detection circuit, the controller and the main power supply on-off circuit;

the controller is connected with the internal power supply, the card slot detection circuit and the main power supply on-off circuit;

the internal power supply is used for outputting electric energy to the card slot detection circuit and the controller when the internal power supply is conducted;

the card slot detection circuit is used for controlling the conduction of the main power supply on-off circuit when the ETC card is inserted into the card slot;

the main power supply on-off circuit is used for controlling the main power supply to output electric energy when the main power supply on-off circuit is switched on;

the controller is used for receiving an operation instruction, executing corresponding operation on the ETC card according to the operation instruction, and controlling the on-off circuit of the main power supply to be switched off if the time length for which the controller does not receive the operation instruction is greater than or equal to the preset time length;

the main power supply on-off circuit is also used for controlling the main power supply to stop outputting electric energy when the main power supply on-off circuit is disconnected.

4. The card reader of claim 3, wherein the card slot detection circuit comprises: the card switch is connected with the main power supply on-off circuit;

the card switch is used for being switched on when the ETC card is inserted into the clamping groove, and controlling the main power supply on-off circuit to be switched on when the card switch is switched on.

5. The card reader of claim 4, wherein the card slot detection circuit further comprises: the card detection circuit is connected with the card switch, the controller and the internal power supply;

the card switch is also used for disconnecting when the ETC card is pulled out of the card slot;

the card detection circuit is used for outputting a disconnection instruction to the controller when the card switch is disconnected;

the controller is further configured to control the main power supply on-off circuit to be turned off when the controller receives the turn-off instruction, or when a duration that the controller does not receive the operation instruction is greater than or equal to a preset duration.

6. The card reader of claim 3, wherein the main power on/off circuit comprises: the on-off control circuit is connected with the on-off execution circuit and the pulse generation circuit; the pulse generating circuit is connected with the card slot detecting circuit and the on-off control circuit;

the card slot detection circuit is used for controlling the pulse generation circuit to generate high-level pulses when the ETC card is inserted into the card slot;

the pulse generating circuit is used for controlling the on-off control circuit to be conducted when the pulse generating circuit generates high-level pulses;

the on-off execution circuit is used for controlling the power supply to output electric energy when the on-off execution circuit is switched on;

and the on-off control circuit is used for controlling the on-off execution circuit to keep on when the on-off control circuit is on.

7. The card reader of claim 6, wherein the on-off control circuit is connected to the controller;

and the controller is used for controlling the on-off control circuit to be conducted after the internal power supply outputs electric energy.

8. The card reader of claim 6,

the controller is used for controlling the on-off control circuit to be switched off after the controller receives the switching-off instruction or when the controller does not receive the operation instruction for a time period which is longer than or equal to a preset time period;

and the on-off control circuit is used for controlling the on-off execution circuit to be switched off when the on-off control circuit is switched off.

9. The card reader of claim 5, wherein the disconnect indication is a high signal; the card detection circuit comprises a first controllable element; one end of the first controllable element is connected with the card switch, and the other end of the first controllable element is connected with the controller;

the first controllable element is used for being disconnected when the card switch is disconnected;

and the controller is used for receiving a high level signal when the first controllable element is disconnected and controlling the power supply on-off circuit to be disconnected according to the high level signal.

10. The card reader of claim 6, wherein the pulse generation circuit comprises: the capacitor is connected between one end of the on-off control circuit and the card switch;

and the capacitor is used for charging when the card switch is switched on and sending high-level pulse to the on-off control circuit in the charging process.

11. The card reader of claim 6, wherein the on/off actuator circuit comprises: one end of the second controllable element is connected with the on-off control circuit, one end of the second controllable element is connected with the main power supply, and the other end of the second controllable element is connected with the internal power supply;

the second controllable element is used for controlling the main power supply to output electric energy when the second controllable element is switched on, and controlling the main power supply to stop outputting electric energy when the second controllable element is switched off.

12. The card reader of claim 6, wherein the on-off control circuit comprises: one end of the third controllable element is connected with the pulse generating circuit, the other end of the third controllable element is connected with the on-off executing circuit, one end of the fourth controllable element is connected with the controller, and the other end of the fourth controllable element is connected with the on-off executing circuit;

the pulse generating circuit is used for controlling the third controllable element to be conducted when the pulse generating circuit generates a high-level pulse; the controller is used for sending a high level signal to the fourth controllable element after the power supply outputs electric energy, and sending a low level signal to the fourth controllable element after the controller receives the disconnection instruction or the time length when the controller does not receive the operation instruction is greater than or equal to the preset time length;

the third controllable element is used for conducting when receiving a high-level pulse; the fourth controllable element is used for being switched on when receiving a high level signal and being switched off when receiving an electric low level signal;

and the on-off execution circuit is used for receiving a low level signal when the third controllable element and/or the fourth controllable element are/is switched on, and controlling the main power supply to output electric energy according to the low level signal.